U.S. patent number 3,750,925 [Application Number 05/205,550] was granted by the patent office on 1973-08-07 for snap attaching apparatus.
Invention is credited to Erich A. Schmidt, Volker E. Schmidt.
United States Patent |
3,750,925 |
Schmidt , et al. |
August 7, 1973 |
SNAP ATTACHING APPARATUS
Abstract
An improved feed arrangement is disclosed for feeding two
component fasteners, such as buttons, snaps and the like having a
pronged element and a backing element, to an apparatus which
attaches the fasteners to material, such as a garment. The feed
arrangement for each component includes a hopper-chute assembly, a
guide channel and a driving means. Each hopper-chute assembly is
readily detachable from the apparatus to provide rapid substitution
of one type or style of fastener for another and includes means
preventing discharge of elements from the chute when the assembly
is detached from the apparatus. The guide channel and drive means
are arranged to receive elements from the chute and move them
successively in a single step to a setting station where an anvil
and a ram forcefully bring the elements together. The guide channel
for the pronged elements is formed by a pair of spaced, opposed
wall members spring biased towards each other. The wall members
have faces of non-linear shape and taper towards each other in the
direction of feed to form a labyrinth configuration therebetween.
This configuration serves to align the prongs with the axis of the
channel so that they will not be prematurely and unwantedly
deformed by jaws on the anvil.
Inventors: |
Schmidt; Erich A. (Lexington,
KY), Schmidt; Volker E. (Lexington, KY) |
Family
ID: |
22762661 |
Appl.
No.: |
05/205,550 |
Filed: |
December 7, 1971 |
Current U.S.
Class: |
227/116; 227/18;
227/119 |
Current CPC
Class: |
A41H
37/04 (20130101); A41H 37/10 (20130101) |
Current International
Class: |
A41H
37/00 (20060101); A41H 37/04 (20060101); A41H
37/10 (20060101); B25c 007/00 () |
Field of
Search: |
;227/15,18,114,116,119,120 ;221/171,172,173,175,287,312R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Custer, Jr.; Granville Y.
Claims
What is claimed is:
1. In an apparatus for attaching pronged head elements and backing
elements of two component fasteners to material at a setting
station by means of an anvil and cooperating ram, an improved means
for feeding said pronged head elements to said setting station
comprising:
a pronged head element feed assembly including a hopper, a guide
channel one end of which opens at said setting station, a chute
connected to said hopper and the other end of said guide channel,
and pusher arm means adapted to drive pronged head elements through
said guide channel,
said guide channel including a bottom surface and a pair of spaced
side walls disposed to define a longitudinal channel therebetween
tapered in a feed direction, with at least one of said side walls
having a portion with a non-linear surface whereby engagement of
the prongs of said head elements with said at least one non-linear
surface portion causes oscillation of said head element into proper
alignment.
2. The invention according to claim 1 wherein said ram and anvil
are vertically actuated, and
each side wall of said guide channel has a portion with a
non-linear surface forming a labyrinth passage between said
portions.
3. The invention according to claim 2 wherein one of said side wall
portions is movable relative to the other portion, and means
biasing said at movable portion towards said channel.
4. The invention according to claim 2 wherein said chute is
attached to said guide channel at an angle of approximately
45.degree., and
further comprising a bevelled area formed in a side wall of said
channel opposite said chute adapted to receive the prongs of said
head elements entering said guide channel at said 45.degree.
angle.
5. The invention according to claim 4 further comprising a camming
surface formed on the side wall of said guide channel to which said
chute is attached, said camming surface being forward of said
bevelled area in the direction of feed and serving to cam the head
elements downward to fully seat in said guide channel with the
prongs extending upward to engage said labyrinth configuration.
6. The invention according to claim 2 further comprising means
pivotally attaching one of said side walls to said channel, and
locking means adapted to normally hold said pivotal side wall in a
closed position, whereby said guide channel may be opened to clear
stoppages.
7. The invention according to claim 2 further comprising element
retainer means adapted to hold said head elements at said chute,
and
means on said pusher arm means adapted to remove said retainer
means from the path of said head element upon commencement of drive
of said pusher arm means toward said setting station.
8. The invention according to claim 7 wherein said element retainer
means comprises,
a recess formed in the bottom surface of said guide channel,
an arm pivotally mounted in said recess,
a pin mounted on one end of said arm and extending above said
bottom surface, and
spring means biasing said arm to a position where said pin prevents
passage of a head element through said guide channel.
9. The invention according to claim 2 wherein said side walls
together form a vertically directed, annular guide at said setting
station through which said anvil moves during setting
operation.
10. The invention according to claim 2 wherein each said side wall
further comprises a longitudinally extending groove adjacent to and
forming an extension of said bottom surface, the peripheral edge
portion of said head elements engaging in said recesses to be
guided thereby.
11. The invention according to claim 1 further comprising a
profiled leading end on said pusher arm means adapted to engage a
peripheral edge portion of said elements.
12. The invention according to claim 1 wherein said hopper includes
a filling port, a cover over said filling port, an emptying port, a
door normally closing said emptying port, and a feeding port, said
chute being connected to said feeding port.
13. The invention according to claim 1 further comprising means to
detachably connect said chute to said guide channel.
14. The invention according to claim 13 further comprising detent
means in the end of said chute which is normally connected to said
guide channel adapted to prevent unwanted discharge of elements
from said chute when the latter is detached from said guide
channel.
15. The invention according to claim 14 wherein said detent means
comprises a leaf spring moved to an inoperative position when said
chute is attached to said guide channel.
16. The invention according to claim 1 wherein said hopper and
chute form an assembly mounted so as to be readily accessible from
a front portion of said apparatus.
17. The invention according to claim 1 wherein said chute is
attached to its guide channel at an angle of approximately
45.degree. whereby said apparatus presents a narrow profile.
18. The invention according to claim 17 further comprising a
plurality of said apparatus assembled in a closely spaced series
whereby all of the fasteners for a garment may be set in a single
operation.
19. The invention according to claim 1 wherein said anvil includes
a concaved end adapted to receive said head elements, and
a pair of jaws mounted on opposite sides of said anvil and adapted
to hold said head elements thereon during the setting
operation,
said guide channel aligning said prongs with said jaws.
20. A guide channel for orienting prongs projecting from one side
of an element comprising
a bottom surface, and
a pair of spaced side walls each having a portion with a non-linear
surface tapering towards the longitudinal axis of said channel in a
feed direction to define a labyrinth passage therebetween whereby
engagement of said prongs with said labyrinth passage causes
rotation of said element to the desired alignment.
21. A guide channel according to claim 20 wherein each side wall
has a longitudinally extending groove adjacent to and forming an
extension of said bottom surface whereby said labyrinth passage
overhangs said bottom surface.
22. A guide channel according to claim 20 further comprising a
pivotal member forming one of said side walls, and
means to lock said pivotal member in a normal closed position,
whereby said channel can be opened to clear stoppages.
23. A guide channel according to claim 19 wherein said non-linear
portions are formed on elements spring biased toward the axis of
said channel whereby said labyrinth passage is spring loaded.
24. The invention according to claim 1 further comprising a backing
element feed assembly including another hopper, another guide
channel one end of which opens at said setting station, another
chute connecting said another hopper to the other end of said
another guide channel, and pusher arm means adapted to drive
backing elements through said another guide channel.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for attaching two
components of a fastener to material in a sandwich configuration
and in particular to a feed device having a guide channel with a
labyrinth passage which engages prongs projecting from one of said
components to position properly the prongs by the time the pronged
component reaches a setting station.
2. Description of the Prior Art
The prior art is cognizant of apparatus which attaches fasteners to
material, wherein the fastener is one of the several known types
adapted to close an opening in material, such as an article of
clothing. Fasteners of this general type include buttons, snap
fasteners, rivets and the like. In each case the fastener is
characterized by at least two components, one of which has at least
two prongs projecting therefrom. The prongs are adapted to
penetrate both the material and the other component before being
deformed to secure the fastener and material together. Examples of
such fasteners may be found in U. S. Pat. Nos. 1,815,792 (metal
snaps), 2,377,263 (buttons), and 3,107,408 (plastic snaps).
In the heretofore known fastener attaching machines, as shown for
example in U. S. Pat. Nos. 1,944,510; 2,048,930; 2,614,714; and
3,225,993, the head elements having at least two prongs extending
therefrom and the mating backing elements are stored in separate
hoppers and are fed via separate chutes to a setting station where
an anvil and ram drive the elements together to fix the fastener on
the material. The backing elements have presented little difficulty
in delivery to the setting station since they are substantially
flat members which are readily positioned in the backing element
chute. However, the pronged head elements present far more
difficulty in delivery since the prongs must be in substantially
correct alignment with jaws of the anvil or ram at the beginning of
the setting operation or the closing of the jaws will prematurely
deform the prongs resulting in either a sloppy appearance of the
fastener or inadequate overlap of the prongs on the backing element
which will cause the fastener to come apart after only a few times
of use.
Some of the attempts to solve this alignment problem have required
complicated mechanical arrangements which sensed the positioning of
either the head element itself or the prongs projecting therefrom.
Most of these machines have proved to be unsatisfactory for a
number of reasons which include vulnerability to jamming and being
both complicated and expensive to produce and maintain. Also, the
devices of the prior art have had a rather broad beam preventing
their use in closely spaced arrangements which would allow securing
of all of the fasteners on a garment in a single operation.
SUMMARY OF THE PRESENT INVENTION
It is therefore an object of the present invention to provide a
guide channel which will properly orient prongs projecting from
fastener elements as the elements are fed to a setting station.
It is also an object of the present invention to provide a guide
channel having few moving parts which will reliably and accurately
align prongs of fastener elements fed therethrough.
It is another object of the present invention to provide a hopper
and chute arrangement which can be readily exchanged on an
attaching apparatus, which will not unintentionally dispense
fasteners when dismounted from the apparatus, and which will feed
fastener elements to a guide channel at an angle of approximately
45.degree. so that the apparatus will present a narrow profile.
It is a further object of the present invention to provide an
apparatus for attaching fasteners to a garment, which apparatus can
be arranged in closely adjacent series so that all of the fasteners
for a garment can be mounted in a single operation.
It is still another object of the present invention to provide a
guide channel for a fastener attaching apparatus which is
substantially free of stoppages but may be readily opened to clear
any stoppages which may occur.
It is yet another object of the present invention to provide a
single step feed mechanism for a fastener attaching apparatus which
mechanism will feed only one mating pair of fastener elements at a
time to setting station with the pronged element arriving at the
station in substantially correct orientation.
The present invention is used in a fastener assembly apparatus and
is characterized by a pair of hoppers and their associated chutes
arranged to be readily dismountable from the apparatus, means at
one end of each chute to prevent the unintended discharge of
fastener elements from the chute when dismounted from the
apparatus, and the chutes arranged to feed fastener elements to
their guide channels at an angle of approximately 45.degree.. The
head element guide channel is formed by a pair of opposing,
tapering, non-linear wall members forming therebetween a labyrinth
configuration extending along the longitudinal axis of the channel.
The channel has few moving parts and one wall portion is pivotally
mounted in order to provide access to fastener elements within the
channel. A fastener retainer member is arranged in the channel
adjacent the chute to act in cooperation with pusher arm means to
release the next successive fastener element only upon the initial
forward movement of the pusher arm means. Drive means, including
the pusher arm, are arranged to move the elements through the guide
channel to a setting station in a single stop.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the present invention will be
apparent from the following detailed description when considered
with the accompanying drawings in which:
FIG. 1 is a perspective view of a fastener assembly apparatus
embodying the present invention with a second like apparatus being
shown in phantom;
FIG. 2 is another perspective showing the guide channel in an open
position;
FIG. 3 is a top plan view of the guide channel of the present
invention;
FIG. 4 is a schematic view, similar to FIG. 3, partially in section
showing the passage of a pronged fastener elements through the
guide channel and the details of one wall member;
FIG. 5 is a longitudinal section through the guide channel and
chute taken along line 5--5 of FIG. 3;
FIG. 6 is a vertical section through the guide channel and chute
taken along line 6--6 of FIG. 5.
FIG. 7 is an end view of the apparatus embodying the present
invention; and
FIG. 8 is a schematic representation of the setting station during
attachment of the fastener to a piece of material.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention has been shown and is described in connection
with a fastener assembly apparatus of a conventional type. Only
those portions of the known apparatus which are necessary for an
understanding of the present invention have been shown with any
detail for descriptive purposes. For further details of the
operating mechanism and structure of known apparatus of this type,
reference is made to U. S. Pat. Nos. 2,048,930; 2,377,263; and
3,225,993. Also, the fastener shown is a snap fastener having a
head element with at least two prongs projecting from the reverse
side and a backing element formed as the socket portion of the
snap. The obverse side of the head element can be colored or
configured as desired but the present device will not register any
head elements having an asymmetric design. The present feed
arrangement will, of course, feed the mating stud element and its
associated backing element, the only requirement being that the
element having the projecting prongs must be fed through the guide
channel having the labyrinth configuration.
The attaching apparatus according to the present invention includes
a head element feed assembly 10, a backing element feed assembly
12, a setting station 14 and driving means 16, 18 for each feed
assembly.
The head element feed assembly 10 includes a storage hopper 20
having a top filling cover 22, a bottom emptying cover 24, and an
opening (not shown) through which the head elements are passed to a
head element feed chute 26 by conventional means (also not shown).
The lower end of chute 26 is detachably secured to a guide channel
28 bY means of thumb screw 30 and end element 32 as illustrated in
FIG. 6. A leaf spring 34 is mounted in end element 32 to normally
block passage of head elements from the chute when the thumb screw
30 does not hold end element 32 tightly against the guide channel
28. The end of the chute 26 approaches the guide channel at an
angle of approximately 45.degree..
The guide channel 28 extends in the feed direction from the area of
the chute 26 to the setting station 14 and is constructed with a
bottom surface 36 and two spaced side wall members 38 and 40. Each
side wall member includes a portion 39 and 41, respectively,
profiled to present a non-linear surface which decreasingly tapers
inwards towards the longitudinal axis of the channel in the
direction of feed. The details of only wall member 40 have been
shown in FIG. 4 but it is to be understood that both wall members
are substantially the same in this non-linear portion.
Element 42 is mounted in slot 43 formed in wall member 40. A
surface of element 42 directed toward the longitudinal axis of the
channel is profiled to present the above mentioned non-linear
tapering profile. The element 42 is mounted on a pair of spaced
pins 44 having coil springs 45 mounted thereon between the element
42 and the wall member 40. The pins 44 have enlarged heads limiting
the inward movement of the element towards the axis of the channel
while permitting the outward movement away from the axis. The
elements forming portions 39 and 41 together form a spring biased
labyrinth passage in the channel.
The ends of the side wall members, at the setting station has an
arcuate recess which together form a vertically directed annular
guide 46. Each side wall member also includes a longitudinal recess
47, 48 adjacent to and forming an extension of the bottom surface
36.
Side wall member 38 is formed as an assembly 49 which is pivoted on
pin 50 and can be locked in the closed position by locking means
52.
The end of the side wall member 38 towards chute 26 includes a
camming surface 54 which is inclined downwardly in the direction of
feed. As is illustrated in FIGS. 5 and 6, a bevelled area 56 is
formed in side wall 40 opposite the chute 26. A retainer pin 58
mounted on the free end of a rotatable arm 60 extends above bottom
surface 36 at the forward feed end of the bevelled area 56. The arm
60 is pivoted on pin 62 (FIG. 3) for horizontal movement in a
recess 64 and is biased to the position shown in FIG. 6 by a spring
66. A pusher arm 68 is mounted at the rear end of the guide channel
28 and is adapted to be driven by drive means (not shown)
longitudinally through the length of the guide channel in a slot
70. The front end of pusher arm 68 has a profiled portion 72
adapted to engage the fastener element.
The backing element feed assembly 12 is somewhat similar to the
head element feed assembly 10. Backing element hopper 74 is
substantially the same as hopper 20 and a chute 76 is similar to
chute 26 while differing therefrom in length. Chute 76 is attached
to a backing element guide channel 78 which is arranged to feed the
backing elements to the setting station by any a pusher arm (not
shown) which may be similar to the pusher arm 68 associated with
guide channel 28.
As is shown in FIG. 8, the setting station includes an anvil 80 and
a coaxially mounted ram 82. The upper end of anvil 80 has a
slightly concave surface 84. Spring gripping jaws 86 and 88 are
mounted on opposite sides of anvil 80 and are normally biased
towards each other. The anvil and ram are attached to drive means
(not shown) arranged to drive the anvil and ram vertically
together.
The apparatus includes several drive means none of which have been
shown in detail since they may be of any suitable type such as
electric, electromechanical, hydraulic or pneumatic systems. Each
hopper is provided with drive means which initially move the
elements from storage in the hopper to the chute. The pusher arm of
each guide channel is operatively connected to drive means to be
driven thereby in order to push an element through its respective
channel in a single step. A drive means drives the hammer and anvil
together to set the fastener on the material. The last two
mentioned drive means are preferably synchronized. Conventional
means, such as a foot operated switch (not shown), are provided for
the operator to actuate the drive means and effect the setting
operation.
In order to operate the above apparatus, hoppers 20 and 74 are
filled with head elements and backing elements, respectively, and
the system is charged by a sufficient number of actuations of the
hopper drive means to fill the associated chutes with fastener
elements. Chute 26 is firmly held against channel 28 by thumb screw
30 so that spring 34 clears the chute for passage of the head
elements. The leading head element 90 will fall into channel 28 at
an angle of approximately 45.degree. with the prongs 92 and 94
extending into bevelled area 56 and the head portion resting
against retainer pin 58 and extending partially into recess 48. The
lead backing element 96 will enter feed channel 78 about this same
time.
The apparatus is now ready for the operator to position the
material in the setting area and actuate the apparatus drive means
by any conventional means (not shown) such as the foot switch
mentioned above. The feed arm drive means (not shown) will cause
the respective pusher arms to move forward in the feed direction.
When pusher arm 68 moves forward it causes arm 60 to rotate
counterclockwise against the bias of spring 66 until pin 58 clears
the head element 90. As head element 90 begins to move forward, its
uppermost or raised edge engages cam surface 54 and is cammed
downward until the entire head portion rests against bottom surface
36 and the prongs 92 and 94 extend substantially vertically. The
continued forward movement of pusher arm 68 and head element 90
brings the prongs 92 and 94 into a random engagement with the
labyrinth passage formed by wall portions 39 and 41. As the prongs
strike the wall portions, see FIG. 4, they will cause the head
element to oscillate during advancing movement in the channel until
the prongs are substantially in line with the longitudinal axis of
the channel and the jaws 86 and 88 of the anvil 80. Any sharp blows
of the prongs against the labyrinth passage will be absorbed by the
spring biased portion forming elements.
The pusher arm delivers the head element 90 to anvil 80
substantially simultaneously with the delivery of a backing element
96 to ram 82. As the pusher arms begin to withdraw, the drive means
for the ram and anvil (schematically shown by 16 and 18) are
actuated. Anvil 80 is driven upward with jaws 86 and 88 initially
holding the head element 90 in the desired position. The jaws will
be cammed out of contact with the head element with the upward
movement of the anvil and the head element will continue to be
guided by the walls of the vertically directed annular guide 46. At
the same time the anvil begins to move, the ram commences its
downward trip carrying backing element 96 with it.
The upward drive of anvil 80 causes prongs 92 and 94 to penetrate
the material 98, the backing element 96 and strike the end of ram
82 which causes the prongs to be deformed until the fastener
elements and material are held tightly together. The anvil and ram
are then drawn apart and the finished material removed.
The present fastener attaching apparatus has many features which
represent significant advances in the art. Among these features is
the head element feed chute approaching the guide channel at an
angle of approximately 45.degree.. This allows for the construction
of apparatus having a narrow beam thus enabling formation of a
closely spaced array of apparatus (see FIG. 1) adapted to place all
of the fasteners on a garment in a single operation.
The head element guide channel 28 has only a few moving parts,
namely, the labyrinth forming elements for aligning the prongs of
the head element. This results in a substantial improvement over
prior art devices in both economy of parts and improved operation
since the likelihood of jamming is substantially eliminated. Also
the ends of the side wall members at the setting station form a
vertically directed guide which keeps the head elements properly
aligned after they are released by the anvil jaws.
The placement of the hoppers on the apparatus is also advantageous
with the hopper for the backing element towards the rear of the
hopper for the head elements towards the front. The backing
elements are generally similar, regardless of the garment, while
the head elements may be of different colors, patterns etc. and
require frequent change for the various garments being
manufactured. The head element hopper is readily accessible and,
since single step feed is used, substitution of head elements can
be rapidly made. Also the relative location of the hoppers clearly
indicates which elements are to be placed therein thus lessening
training requirements for the operators.
Inasmuch as the present invention is subject to many variations,
modifications and changes in detail, it is intended that all matter
contained in the foregoing description or shown in the accompanying
drawings shall be interpreted as illustrative and not in a limiting
sense.
* * * * *