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Cliff: the automatized zipper

Authors:
  • Eindhoven University of Technology, Utrecht School of Arts, Saxion University of Applied Sciences, by-wire.net • fashion technology

Abstract and Figures

It is our strong believe that fashion-more specifically apparel-can support us so much more in our daily life than it currently does. The Cliff project takes the opportunity to create a generic automatized zipper. It is a response to the struggle by elderly, people with physical disability, and ladies who have problems zipping the back-zipper dress. An iterative " research through design " approach was applied (Toeters et al., 2012) to develop a working mechanism and identify the important factors to generate efficient traction mechanism. In between the iterations, the stakeholder and user feedback obtained from exhibitions has been used for the next iterations, which then led to the miniaturization of the Cliff prototype. The development progress of Cliff shows the tremendous potential of developing a generic automatized zipper, and it might be one of the approaches towards the " future of fashion " (Dunne, 2010). Problematic is that wearable systems are almost exclusively discussed with a functional focus. The functional benefit is entirely lost if a user refuses to adopt the technology because of social factors argues Dunne (2014). During the next steps, Visual Perception Aesthetics (Dunne, Profita and Zeagler, 2014), Dynamic Functionalities (Seymour, 2008), and Cliff's Ease of Use (Starner et al., 1999) must be reconsidered depending on its context of use. It is crucial to ensure users could positively perceive and use the Cliff as an assistive device for the zipping and unzipping process. With this paper, we hope to share tools and insights to enlarge the social engagement of the fashion industry by product innovation.
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ISBN: 978-989-20-7053-7
Cliff: the automatized zipper
Mohamad Zairi Baharom
Eindhoven University of Technology
m.z.baharom@tue.nl
Marina Toeters
Eindhoven University of Technology
marina@by-wire.net
Frank Delbressine
Eindhoven University of Technology
fdelbres@tue.nl
Chet Bangaru
Eindhoven University of Technology
c.bangaru@tue.nl
Loe Feijs
Eindhoven University of Technology
l.m.g.feijs@tue.nl
Abstract
It is our strong believe that fashion - more specifically apparel - can support us so much more in our
daily life than it currently does. The Cliff project takes the opportunity to create a generic automatized
zipper. It is a response to the struggle by elderly, people with physical disability, and ladies who have
problems zipping the back-zipper dress. An iterative “research through design” approach was applied
(Toeters et al., 2012) to develop a working mechanism and identify the important factors to generate
efficient traction mechanism. In between the iterations, the stakeholder and user feedback obtained from
exhibitions has been used for the next iterations, which then led to the miniaturization of the Cliff
prototype. The development progress of Cliff shows the tremendous potential of developing a generic
automatized zipper, and it might be one of the approaches towards the “future of fashion” (Dunne, 2010).
Problematic is that wearable systems are almost exclusively discussed with a functional focus. The
functional benefit is entirely lost if a user refuses to adopt the technology because of social factors argues
Dunne (2014). During the next steps, Visual Perception Aesthetics (Dunne, Profita and Zeagler, 2014),
Dynamic Functionalities (Seymour, 2008), and Cliffs Ease of Use (Starner et al., 1999) must be
reconsidered depending on its context of use. It is crucial to ensure users could positively perceive and
use the Cliff as an assistive device for the zipping and unzipping process. With this paper, we hope to
share tools and insights to enlarge the social engagement of the fashion industry by product innovation.
Keywords
Automatized zipper, fashion, technology, wearables, assistive device.
Article classification
Research paper
INTRODUCTION AND MOTIVATION
Garments are essential: no one forgets to get dressed before going outside. The clothes are worn so close
to the body they are perceived as very intimate. Both make clothes highly valued and relevant products.
Fashion pretends to be on top of newness but mainly changes on colours and shape. Fashion-oriented
design encourages ingenuity, imagination and innovation (Walker, 2012), which are crucial elements in
pushing forward technological and social progress (Pan et al., 2014). It is our firm believe that fashion
more specifically apparel can support the wearer so much more in our daily life than it currently
does.
A zipper can be seen on various kinds of garments such as on the jacket and dress. Even though the
zipper is a simple device to be operated, not everybody can perform the zipping and unzipping process
efficiently and independently. Therefore, the motivation to develop Cliff, which is an automatic zipper,
is a response to the struggle of the few groups of people such as the elderly, people with physical
disability, and ladies who have problems zipping a back-zipper dress. Hopefully, this innovative idea
and invention could create value, which in turn might lead to the greater benefits for society to ease the
zipping and unzipping process. With team skills in mechanical engineering, fashion design, and
prototyping, Cliff has been developed. Cliff is an attempt to research how innovation can help
developing supportive fashion. Fashion has to innovate, and garments have to become more relevant
and assistive for its users. Therefore, to research this as concrete as possible we took one design
opportunity, the automatized zipper. This paper will discuss what are the essential factors to be
considered in the development of the automatized zipper to ensure users could positively perceive and
use it as an assistive device for the zipping and unzipping process.
Besides researching the essential factors for the users, we also need to tackle the technical issues and
how the iterative research through design method (Toeters et al., 2012) could be beneficial for this
project. The most challenging technical part is on how to develop a generic and universal type of an
automatized zipper and to define the significant factors to produce an efficient traction mechanism for
the Cliff. Additionally, this paper will also look at how the iterative research through design method
could assist and benefits the development of the miniature prototype of the automatized zipper. Overall,
this paper reflects on the early stage development process of Cliff and discusses next development steps.
We hope to share tools and insights to enlarge the social engagement of the fashion industry by product
innovation.
HISTORY: FROM CLASP LOCKER TO ZIPPER
Formerly known as a clasp locker, a zipper is commonly used for binding the edges of an opening of
fabric or other flexible material, like on a garment for example. It can join two pieces of fabric together.
The chronology of zipper invention begins back in 1851, when Elias Howe, who invented the sewing
machine, received a patent for an automatic, continuous clothing closure (Howe, 1851). The first person
to design, conceive the idea of slide fastener and develop the working zipper is Whitcomb L. Judson
(Judson, 1893), an American inventor from Chicago, back in 1893. Whitcomb’s patent use the word
'clasp locker' instead of using the word 'zipper', which is a complicated hook-and-eye shoe fastener
(Judson, 1893; Shaw and Grall, 2003). In 1913, Gideon Sunback who was an electrical engineer
designed the modern zipper and patented a design entitle 'separable fastener' in 1917 (Sundback, 1917).
The design increased the number of fastening elements, introduced two-facing rows of elements that
pulled into a single piece by the slider and also increased the opening for the elements guided by the
slider. In 1937, the B.F Goodrich company then decided to use Gideon's fastener on a rubber boot and
named the device as 'zipper' (Ansun Multitech, 2015).
THE ZIPPER MECHANISM
Figure 1 shows the zipper closing mechanism. As the slider moves up with speed (v) in Figure 1(a) and
the zipper tape is fixed, it pushes the elements to enter the slider throat together at specific angles. The
force (Fw) extended by the lower wedge is perpendicular to its movement direction. As the tape moves
through the slider, the lower wedge inclined edges pushed the elements towards each other and latched
into a gap on the opposite side. It is the same process as in Figure 1(b) when the zipper tape is being
pulled from the bottom and the slider is fixed. This condition will also complete the zipper closing
operation. When the slider has been pulled down as in Figure 2(a) and the tape is fixed, the diamond
pushes against the slanted edge of the elements and pivoting each element away. Then, both sides of the
zipper are detached. This operation can also be done by fixing the slider and pull both sides of the zipper
tape as shown in Figure 2(b) (Baharom et al., 2016).
Figure 1. Zipper closing mechanism diagram.
Figure 2. Zipper opening mechanism diagram.
INSPIRATION: ZIPPERBOT AND ACTUATION IN WEARABLES
The development of an automatized zipper could be useful as an assistive device to assist anybody who
has problems using a zipper. This project was inspired by Adam Whiton from Massachusetts Institute
of Technology (MIT), who build the first robotic zipper known as the Zipperbot (Whiton, 2015). The
structure of the Zipperbot did not use the slider of the zipper to zip or unzip. Therefore, this newly
designed Cliff tries to remain the zipper structure as it is and develops a generic and universal type of
robotic zipper. Besides that, the inspiration of this project also comes from an article written by Marina
Toeters and Loe Feijs on actuating movement in refined wearables (Toeters and Feijs, 2014). The Cliff
could be another new device in the world of wearable technology and the “future of fashion” (Dunne,
2010).
APPLICATION OPPORTUNITIES FOR AN AUTOMATIC ZIPPER
The back closures are a conventional fastening method on garments designed for all ages such as dresses,
skirts and blouses. A back closure system means that the wearer will have to fasten their garment at the
rear, with the use of a zipper, hook-and-eyes or buttons. This kind of feature of a garment’s design
comes for stylistic reasons. It allows for a solid unbroken front to the garment that is uncluttered by
fasteners. Fashion designers often favour this back closure for couture and formal wear, where the
aesthetical value is essential. However, the back closure still has its advantages and drawbacks. A back
closure dress offer the wearer a quick enter and exit from the garment from the rear side, especially for
the dress that is closely fitted and does not stretch. For example, a high necked-garment can be quickly
pulled on without disturbing the wearer’s hair with the opening at the back. The most obvious drawback
of the back closure is the difficulty to reach the middle of the wearer’s back and manipulate the fasteners
to close their dress. Therefore, the wearer might need assistance to donning or doffing their dress. If
they keep trying on their own, it could be time-consuming to wear or remove the dress.
Dressing and undressing difficulties are also seen for people who are sick or have a physical disability.
These people who are unable to zip or unzip themselves will require assistance from others to perform
the task. Individuals with upper limb reduction deficiencies (ULRD) for example will have difficulties
to use the zipper. In a study conducted by Vasluian et al., more than 50% of the youngsters with ULRD
reported having problems to perform their daily life self-care activity of dressing and undressing and
tying their shoelaces (Vasluian et al., 2014). This group of people who live with only one arm, or with
no arm, will have significant difficulties of executing their daily task. Besides that, individuals with
myotonic muscular dystrophy (Balon, 2011), a kind of degenerative disease which limits the use of
hands can get some benefits too from the development of this automatized zipper. Most of our daily
activities or tasks require the use of both hands at one time. In a study related to patients with Parkinson's
disease (PD), few modifications have been suggested to change their approach to open or close the
zippers (Mady and Atiha, 2015). PD patients will experience some dexterity on their body systems,
activities and the fine motor development. They usually have issues with finger dexterity which will
reduce their ability to use the zippers or fasten button themselves. Automatic zippers could also become
useful in interior solutions like for instance curtains. But they won’t be discussed in this paper, as it is
not in the interest of this conference.
AN ITERATIVE “RESEARCH THROUGH DESIGN” (Toeters et al., 2012) APPROACH
By making prototypes, designers simultaneously discover how to approach the problem at hand. In some
situations, it can be more efficient than first drafting the system on paper. Through an iterative process,
it is easier to approach complex design challenges using multiple cycles. The perfect solution doesn’t
have to happen in the first attempt. The act of designing is not only a thought process but also a generator
of knowledge. Creating tangible solutions that can be experienced are essential throughout the design
process to validate ideas and to guide further developments. Research through design involves making
and reflection. It allows creating a dialogue with the material and helps the designer and stakeholders to
envision future applications with the prototypes. Touching materials and demonstrators are also
important to talk to (potential) stakeholders and to convince the people in the boardroom (Toeters et al.,
2012). The next chapter will discuss multiple prototypes that were created in Cliff’s iterative research
through design process.
PROTOTYPING: THE FIRST THREE ITERATIONS
Figure 3. First iteration prototype (Meccano)
Iteration 1: After understanding the physics and mechanics of the zipper, this project begins with
exploring the potential traction mechanism using Meccano (Marriott, 2012). Meccano is a toy consisting
of a set of plastic and metal parts which enables the building of working models, mechanical devices or
prototypes. The aim for this first iteration is to identify the potential mechanism that can generate
traction to move the zipper tape since the slider is fixed on the Meccano structure. The main challenge
here is to develop a generic and universal type of traction mechanism which can be used in all types of
zippers. After two months of trial, the first iteration of this project works. Figure 3 shows the first
iteration prototype made of Meccano. The direct current (DC) motor and battery is placed on top of the
rotating wheel. It used two gear sprockets kind of wheels as traction mechanism on both sides of the
tape to establish the uniform distribution of normal force acting towards the zipper tape. The gear
sprocket wheel from top and bottom side of the prototype make contact on the zipper tape surface and
generate traction. The gear teeth grab the zipper tape in between the top and bottom wheels. This
mechanism managed to drive the zipper tape in the forward and backwards direction for the zipping and
unzipping process.
Reflection on iteration 1: The weaknesses of this first iteration prototype are on its stability. It generates
vibrations during its operation. Secondly, the gears used to connect the DC motor and the rotating wheels
could easily misalign. Besides that, this first iteration is too big in size, too heavy and the metals look.
Therefore, it is not suitable to be attached to garments.
Gear
sprockets
Zipper
tape
Slider
DC Motor
Battery
Elements
Figure 4. Second iteration prototype (Meccano)
Iteration 2: Figure 4 shows the second iteration prototype also with Meccano. This second iteration
aimed to stabilize the overall structure from the first iteration. It is essential to evaluate and observe
correctly why this mechanism works. The DC motor has been placed on the side of the rotating wheels.
Reflection on iteration 2: The movement and performance of this second iteration prototype are much
better than the previous one. We found that the gear sprocket from the top and bottom side of the
prototype make contact with the zipper tape surface and generate traction. The gear teeth grab the zipper
tape. The overall size of this second iteration prototype is still too big to be placed on garments, and it
still looks metal like.
The second iteration prototype has been exhibited in two exhibitions in Eindhoven in November 2015
which are the Smart Homes exhibition (Smart Homes, 2015) and Liever Thuis exhibition (Liever Thuis,
2015). Based on these two exhibitions, most of the people gave positive feedbacks to this robotic zipper
prototype. They showed their interest in this project and said that this device could be beneficial to
everybody who has problems to use normal zippers independently. Regarding the functional
requirements, most of the visitors could clearly envision the primary function provided by this device,
which is to do the zipping and unzipping process automatically. Regarding non-functional requirements,
which express the qualities that this device should have, they are mainly focused on the size of the final
piece. The majority of the respondents wants it to be small and handy with a minimum thickness of the
inner side that is in contact with human skin. This project also showed to a group of VITALIS caregivers
(Vitalis, 2016), a company who runs a care home for elderly. This company also develops tools to extend
independent lifestyles for the same target group. Their opinion on this project is this project is incredibly
fresh and could assist elderly to dress and undress by themselves. They also mentioned that the final
piece should be not too small and easy to be placed on the garments. Besides that, the elderly also have
shown their interest in this project. They found that this project is fascinating and could help them to zip
their jacket because they usually have problems dealing with the small pull tab to pull the zipper slider.
DC Motor
Gear sprockets
Zipper tape
Elements
Figure 5. Third iteration prototype (miniature model) with dimension in milimeters (mm)
Iteration 3: Based on the feedback obtained from the Smart Homes and Liever Thuis exhibitions (Liever
Thuis, 2015; Smart Homes, 2015), along with the understanding of the mechanism from the first and
second iteration, we continued the development of this robotic zipper into the miniaturization stage. At
this juncture, we are trying to produce a smaller automatized zipper. The third iteration target is to
develop a miniature model that can run on a jacket designed by Marina Toeters (Toeters, 2015). The
rapid prototyping process has been used to produce this miniature model of the robotic zipper (Kuusk
et al., 2012; Price and Lewis, 2015; Toeters et al., 2012; Zorriassatine et al., 2003). It used ABS plastic
as the rapid prototyping material. Showing in Figure 5 is the third iteration prototype on a jacket. As can
be seen, the DC motor was placed on the side of the chassis. The motor shaft is parallel to the rotating
shaft of the traction wheels. The selection process of this DC motor has been made after a kinematic
analysis to determine the suitable DC motor that can drive this robotic zipper based on the forces on this
system (Baharom et al., 2016). The design for this third iteration functions like a detachable piece, which
separates the top and bottom chassis of the Cliff. Both sides of the chassis joined through a screw, slotted
in the middle, which allows it to act as a clip. It offers flexibility where you can quickly put on and take
off the Cliff from your garments. The other significant finding on this third iteration is the need of a
sufficiently high normal force to clamp the top and bottom chassis together, and ensure the fabric engage
between the two rotating wheels. It is essential to ensure traction. Therefore, a metal clip is slotted in at
the front of the Cliff as can be seen in Figure 5. This metal clip provides the normal force to the top and
bottom chassis, to ensure the fabrics of the jacket are in contact with the traction wheels, thus generates
friction and produce excellent traction for the zipping and unzipping process.
Reflection on iteration 3: Even though this third iteration prototype works well, there are still a few
aspects which need to be improved. The DC motor position on the side of the chassis causes imbalance
during the movement, and could lead to misalignment of the rotating wheels. Moreover, this third
DC Motor
Rotating
wheel
Metal
clip
iteration prototype also does not include a switch and battery, attached to the structure as a single
complete unit.
This third iteration is a significant achievement of this project since we managed to develop the Cliff in
a much smaller size (40 x 57.3 x 25 mm), compared to the previous two early iterations. Marina Toeters
has given her feedback on this success. She says (Toeters, 2016):
I’m impressed with the latest development of the Cliff, which it is currently a working prototype that
suitable to apply in garments. Numerous technical, material and functional iterations are being made.
From the big size, towards the tiny system as it is now. For the upcoming iteration, the clamp function
is to be developed and adjusted, applying pressure (possibly via a steel structure or coil spring). The
battery 2 times the tiny 3.7V batteries will equal to one battery pack of 7.4V) and, if needed, a printed
circuit board (PCB) has to be integrated into the main body of the zipper system, a switch to be added
on top of the system, left side (to be handled with the right hand) and the motor to be moved below
vertical against the zipper. The size of the system is already a good, small size for the forthcoming show.
Styling work on the front side of the casing (rounded edges, transparent casing to avoid obstruction but
keeping mechanism visible). Make sure to integrate the wires as neat as possible”.
SOCIAL WEARABILITY
The feedbacks received from Marina Toeters (Toeters, 2016) raised a few important issues such as on
the power and aesthetics. Power is still is a significant problem in most smart clothing and wearables
application (Dunne, 2010). A small size of the battery with sufficient power is usually the most preferred
by designers. Secondly, the aesthetics part is also a crucial element to be looked in. The aesthetics may,
in fact, become the key elements for consumer or users adoption decision (Dunne, Profita, Zeagler, et
al., 2014). The styling work on the front side (rounding edges) as highlighted by Marina is an excellent
point to be looked at. The curved shapes may be perceived as more comfortable and ergonomic since
the Cliff bottom side was placed under clothing and this is more easily read as a protrusion of the body
surface rather than a concealed technology (Dunne, Profita, Zeagler, et al., 2014). Dunne et. al (2014)
also mention that a wearable device worn under clothing may produce a bump or distortion to the body
shape, which may or may not be obviously attributable to something being worn under the clothes
(Dunne, Profita and Zeagler, 2014). Therefore, the thickness of the bottom side of the Cliff should also
be considered as it possibly produces a bump and distortion to the body shape. The bottom side thickness
is influenced by the diameter of the rotating wheels. The Cliff prototype is using two rotating wheels to
generate traction and move the zipper. Therefore, to reduce the thickness of the bottom side is first to
deal with the traction mechanism or a different kind of wheels which might be potential to be used.
If the aesthetics part is not well-taking care of, it could cause the Cliff to be abandoned like other fully
functional or high-performing devices which often neglect the importance of aesthetics values (Dunne,
Profita and Zeagler, 2014). Based on all these feedbacks and the social wearability aspects: how
innovations on the body be accepted by the target group? Therefore, the development of this automatized
zipper enters its fourth iteration process which will be explained in the next subtopic.
THE CURRENT CLIFF PROTOTYPE
Figure 6. Fourth iteration prototype (miniature model with battery and switch in a single unit) and dimension
in milimeters (mm)
Iteration 4: Figure 6 shows the fourth iteration of the Cliff. The construction of this iteration was based
on the feedback received from Marina Toeters (Toeters, 2016) and problems identified from the third
iteration. The aim for this iteration is to build a single unit of the Cliff, with the switch and battery
attached to it. The DC motor is placed on top of the wheels and connected through a vertical side
gearbox. Two pieces of 3.7V LiPo battery are used to power the 6V DC motor, and there is also a battery
charging point installed. The installation of the charging point is the reflection on middle ground care
and maintenance requirements which the consumers are accustomed to given types of maintenance
interaction with the technology such as the charging part (Dunne, 2010). A three poles toggle switch is
used to control the system as the switch provides functions to the ON(unzipping) OFF ON(zipping).
DC Motor
Side
gearbox
LiPo battery
Charging
point
Toggle
switch
Metal clip
This fourth iteration introduces a much smaller and neat shape clip to provide normal forces on top and
bottom chassis, thus clamping both sides. The normal force is vital to ensure the jacket fabric in between
the rotating wheels is in contact with those wheels and generate excellent traction. The ABS plastic
material of rapid prototyping again used as the material for the structure of this fourth iteration prototype.
Reflection on iteration 4: This fourth iteration prototype works well, but not for an extended period of
time, due to reliability issue. The problem is the gears on the side gearbox are too small. Since we printed
those gears using the 3D printer, the material is not strong enough to perform the operation, and the
gears break. The mechanism of this iteration works nicely. Therefore, the construction of the next
iteration will use other materials instead of the 3D printer plastic material. Lightweight metals could be
an option to replace this plastic material. However, choosing the material need to be properly done since
technological components might be stiffer and heavier, which when integrated into clothing, could
create swinging masses or digging edges on the clothing or the body (Dunne and Smyth, 2007). This
condition will result in discomfort and restricted movement or fatigue for the user.
VISUAL PERCEPTION AESTHETICS
De Long et. al discussed the expressive and referential characteristics as shown in Figure 7. The
expressive characteristics are the direct features of the form itself such as the visual elements of shape,
colour and texture. The referential characteristics are interpreted by the viewer itself (Delong, 1998). In
some ways, the expressive characteristics are less open to being interpreted by the user, which it tends
to play an innate response. For example, bolder colours being perceived as aggressive elements and
flowing shape is seen as softer and gentler. Starner et al. found that the expressive characteristics of a
wearable computer concerning colours were often received by the most viewers (at the time) as a
medical device (Starner et al., 1999). The alteration of the head-mounted display has changed the device
into a new referential association as been studied by Starner et.al. Most viewers interpreted the white or
light-coloured wearables devices as the medical device, while grey or black devices perceived as the
consumer products. This is one of the examples on how the colour selection influences the visual
perception aesthetics of wearables devices.
Figure 7. Visual Perception Aesthetics (Dunne, Profita and Zeagler, 2014).
The referential characteristics are the form that the viewer understands as related to something which is
outside of the shape such as the brand logo or a symbol of an occupational role like a badge. Therefore,
the referential characteristics depend more on the viewer or user experiences and prior knowledge. The
introduction of a small “Cliff” and TU/e (Technische Universiteit Eindhoven) logo engraved on the top
of the chassis also attracted a few people during the show in Amsterdam back in April 2016 (Holst
Centre, 2016). It is a kind of referential characteristics which most of them asking about this product
which is still early in the research stage.
The importance of form and colours are the example elements that represent the visual perception
aesthetic. Starner et.al agree that the shape and colour could assist to communicate the machine’s or
devices purpose and help frame the socially accepted uses of a given tool (Starner et al., 1999). Cliff is
currently using rotating wheels which look like a gear sprocket. If the whole structure of the Cliff is not
fully covered, it could bring bad perceptions from the user. They might see the spiky wheels itself as a
kind of dangerous part. The shape of the housing on top and bottom side of the Cliff could be the first
impressions of the user on how the device could also be accepted. Therefore, the right shape and colours
are crucial to ensure that it can be socially accepted as a wearable piece instead of just an assistive device
for the zipping and unzipping process.
DYNAMIC FUNCTIONALITIES
Figure 8. The Cliff at 10th Year Holst Center Anniversary Symposium, Amsterdam. (Photograph by Jonas-
Briels Photography).
The fourth iteration prototype as shown in Figure 8 was exhibited at the 10th Year Holst Centre
Anniversary Symposium in Amsterdam, on 14th April 2016 (Holst Centre, 2016). The Cliff was worn
by a model on the jacket designed by Marina Toeters. A lot of feedback was received from professionals
who attended the event. One of it is from Craig McEwen, from the Sales and Business Development of
ShinEtsu Micro5i, San Jose, USA. He told me “the Cliff could be beneficial to lots of people and also
useful for fashion” (McEwen, 2016). Another expert comment comes from Magdalena Wasowska, the
Divisional Director, Technology and Software Centre of SONY Europe. She mentioned “the Cliff is a
magnificent and useful project. You can add thermal sensor as an additional feature, which could make
Cliff automatically open or close the garment, based on the human body temperature. You should also
try to reduce the size of the Cliff and communicate with the human body through the feedback system.
For the promotion, you should work on a good commercial video for marketing purposes” (Wasowska,
2016). Reflecting on this comments, it describes the importance of dynamic functionality as the
suggestion of adding a thermal sensor in the Cliff is an option to render the existing static functions to
become vibrant and responsive (Dunne, 2010; Dunne et al., 2002). Dunne et. al explained an example
of protective features, like the thermally protective garment such as winter coat is traditionally provides
some degree of thermal insulation. The amount of the insulation will remain the same in any
surroundings or conditions. If the weather suddenly changes, or the user moves to indoor, the winter
coat will become uncomfortable to wear. Traditional technologies will just allow the wearer to unzip
the winter coat, push up the sleeves, or remove it entirely. However, using electronic technologies, the
coat insulation can be replaced with heat-generating technology by using a sensor-driven heat-
generating coat. This kind of technology can provide a dynamic level of thermal protection for different
conditions of the environment (Dunne et al., 2002). It also reveals the potential of the Cliff which can
automatically open the coat zipper if the weather drastically change by embedded a thermal sensor into
the system.
The dynamic functional aspect is one of the most important issues discussed in the wearable systems. It
is usually explained regarding what the wearables do and how well they perform the task. The primary
function of a dress is not only to cover our body or what the dress offers to the user regarding beautiful
design, good fabrics or fashionable looks. It also involves how the dress communicates to the wearer
and others. The feedback loop itself will create an active environment for any wearable. In the Cliff
case, this device could also behave as an active system if sensors could be embedded in the system such
as a thermal sensor. For instance, if your body is sweating, the Cliff could open the zipper automatically.
Besides that, the Cliff could also be an active system to deal with different thicknesses of the fabrics.
Different kind of fabrics such as silk, satin, cotton or even jeans will have different thickness. Therefore,
the amount of normal forces and friction coefficient required to ensure the top and bottom rotating
wheels to grab the fabrics is different. Hence, this situation will need an active actuating system to deal
with it.
EASE OF USE
The accessibility to the wearable device also needs serious attention. Quick access will tremendously
increase the use of the device. The Zipf’s principle of least effort states that people will select a strategy
for action that ensures them that the minimum effort is required to reach the desired result (Zipf, 1949).
Starner et. al mentioned that an informal rule was developed in his project that every function intended
for daily use must consume less than two seconds to be accessed. Longer setup or teardown time for the
interaction or accessibility of any devices will pose a significant barrier to usage (Starner et al., 1999).
This matter will also be taken into consideration for the future development of the Cliff. A lower setup
time to clip the Cliff on the zipper and easy accessibility and control interface will increase the usability
of the Cliff.
OVERVIEW OF THE PROCESS AND FUTURE WORKS
Figure 9. The Cliff project timeline review.
It’s been almost one and a half year since the beginning of this project. Showing in Figure 9 is the Cliff
project timeline review since the initial kick-off in April 2016. It begins with the first stakeholder input
from Marina Toeters itself about the idea and inspiration to design an automatized zipper. Four iterations
produced four prototypes during the first year of this project. In between those iterations, various
feedbacks and comments were received from users and stakeholders. Improvements and modifications
were made, based on the concerns raised by the user or stakeholder, and also from the problems
identified during our discussion and review of the design. We are currently in reflection period. We are
reflecting also the technology, user and process aspects. The end user research towards a specific focus
group will be conducted. It is important to define a particular focus group and finding the right
application of the Cliff.
Wearability is an essential element that needs to be considered seriously during this reflection period.
According to Dunne et.al (2007), social wearability refers to the degree of comfort concerning physical,
mental, emotional and social, which afforded by a body-mounted object or device, rather than the
possibility of it being mounted on the body (Dunne and Smyth, 2007). In this context, a device that
causes discomfort, or brings difficulties to the user to wear, is an unwearable device. An unwearable
device is a device that will not be adopted by its user. Therefore, it is crucial to think about how this
device is physically perceived by the wearer or the user. Several studies conducted on wearability have
investigated the device-centric variables that contribute to wearability such as the physical shape
(volume and contour), the body location of the device, the ability to move freely, and feelings of pain
or pressure (Gemperle et al., 1998; Knight et al., 2002). The benefits of any particular wearable devices
will be lost if the user refuses to adopt the technology itself.
The development progress of Cliff shows enormous potential of developing a generic automatized
zipper. It might also be the “future of fashion” in smart clothing or wearable technology when taking
visual perception, aesthetics and its social aspects into account. For future works, the technology, user
focus, and fashionability need to be improved. Dynamic functionalities (Seymour, 2008), and Cliff’s
ease of use must be reconsidered, depending on its context of use. Every function intended for daily use
must consume less than two seconds access (Starner et al., 1999). Unfortunately, we are not there yet,
but we are actively working on this.
CONCLUSION
This paper reflected on the early stage of the development process of Cliff, an automatized zipper. The
aims of this product development are to identify complexities on different levels. By undertaking an
iterative research through design process the problem definition and essence of the product qualities
became clearer. We were able to unfold them one by one during different cycles by involving the user
and stakeholder feedback in each following iteration. The most challenging technical part is on how to
develop a generic and universal type of an automatized zipper. The first working prototype, which uses
the kind of gear sprocket wheels as the traction mechanism, managed to materialize the intention to
develop a generic automatized zipper. In the following iterations, the significant factors to produce an
efficient traction mechanism for the Cliff, was identified. The chosen mechanism leads to the success
of all four iterations. This achievement led to the development of the Cliff miniature model of a single
unit system complete with a battery and toggle switch. The development progress of Cliff and received
feedback shows the tremendous potential of developing a generic automatized zipper. It might be one
of the approaches towards the “future of fashion”. Without the iterative research through design
approach, applied throughout the Cliff development process, it is impossible to obtain such a deep
understanding of this field and the technological opportunities for this project.
As previously stated, the user will lose the benefits of any particular wearable devices if they refuse to
adopt the technology itself. The most important question here: What are the essential factors to be
considered in the development of the automatized zipper to ensure users could positively perceive and
use it as an assistive device for the zipping and unzipping process?
Visual Perception Aesthetics and its social aspects have to be taken into account (Dunne, Profita and
Zeagler, 2014). The product should avoid any stigmatisation. The right shape and colours are crucial to
ensure that it can be socially accepted as a wearable piece instead of just ‘an assistive device’ for the
zipping and unzipping process.
• On a conceptual level, Cliff’s Dynamic Functionalities (Seymour, 2008) have to develop further. This
device could behave as an active system if any potential sensors could be embedded in the system such
as the thermal sensor. For instance, if your body is sweating, the Cliff will open the zipper automatically.
Besides that, the Cliff should also be an active system to deal with different thicknesses of the fabrics.
The third essential factor which is the Ease of Use must be further developed. Every function intended
for daily use must consume less than two seconds access (Starner et al., 1999).
All these three factors have different outcomes depending on who is going to use Cliff’s. Therefore,
defining the users and involving them even more via participatory design methods is going to be the
next step. We hope that Cliff and these shared tools and insights enlarge the social engagement of the
fashion industry by product innovation.
ACKNOWLEDGEMENT
The authors would like to express their gratitude and special acknowledgements to the Ministry of
Higher Education Malaysia (MoHE) and Universiti Malaysia Pahang (UMP) for the Ph.D programs
funding of Mohamad Zairi Baharom. Also for staff members of D.Search lab, Department of Industrial
Design, Eindhoven University of Technology and by-wire.net, for their kind support during the
fabrication process of the robotic zipper prototype.
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