JPH0531433B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shirring device for leather, etc., and in particular, a device for shirring leather, etc., which is capable of shirring the corner portions of the leather, etc. evenly to the back side. This invention relates to a shirring device.

[Prior art and its problems]

For example, in the corners of a bag, a lug made of leather or the like is sometimes bent toward the back side along a predetermined convex curve, and the back sides are glued together. Leather or the like that is folded back at such corners has an extra length at the inner edge.

Conventionally, the surplus portion of the inner edge of the ear portion folded back at the corner has been removed by making darts or incisions, as shown in FIG. There is a method of tucking in the folded ears.

The method of making darts or cuts is easy to mechanize, but slight deviations in dimensions may cause the back side of the leather or the core material applied to it to be visible, or the ears on both sides of the darts or cuts may overlap. It becomes dull and unsightly, and the product value is likely to be lost.

The method of shirring the ears gives a luxurious appearance, but it is difficult to shirre evenly, requires a highly skilled technique, and is said to be difficult to perform mechanically.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a shirring device for leather, etc., which is capable of shirring the selvage portion of the leather, etc. evenly on the back side thereof. It is.

[Means for solving problems]

In order to achieve the above object, the apparatus for shirring leather, etc. according to the present invention includes a holding means for holding the leather, etc., and a position for positioning the holding position of the leather, etc. in accordance with the radius of curvature of the corner portion thereof. The regulating device is arranged radially at equal angular intervals around the holding means, and is arranged along the back side of the leather, etc. held by the holding means to a retracted position on the outside of the corner of the leather, etc. and from this to the holding means. A plurality of claws are provided so as to be able to move forward and backward across an extended position inside the ear part of the leather or the like folded back to the center side of the machine, and a claw drive device that drives each claw forward and backward at the same time. It is characterized by:

Another device for shirring leather, etc. according to the present invention has, in addition to the above-mentioned configuration, a folded back shirring device between each pawl located at the advanced position, in order to perform more even shirring. This device is characterized by being provided with a nail receiver that is placed with a space in which the ear portion of leather or the like is inserted.

[Effect]

The leather and the like to be brought into the shirring device of the present invention are prepared as follows and then brought into the shirring device of the present invention.

In other words, adhesive or pressure-sensitive adhesive is applied to the periphery of the back side of the leather, etc. or the back side of the core material applied to it, and the edges of the leather, etc. Prepare by folding it back and fixing it with adhesive or adhesive. In such a state, the corner portions of the leather or the like are usually raised obliquely from the horizontal to the back side.

According to the present invention, after the leather etc. prepared in this way is positioned by the position regulating device and held in that position by the holding means, the plurality of claws are simultaneously moved from the retreated position to the advanced position by the claw driving means. By driving the leather, the corners of the leather, etc., which are raised diagonally from the horizontal to the back side, are folded back to the back of the leather, etc. or the core material by each claw, and fixed with adhesive or adhesive. Ru. Since the claws are arranged radially at equal angles from the center of the holding means, the adhesive points at the corners are distributed at equal intervals in the circumferential direction of the corner parts, and there is no excess leather etc. between the adhesive parts. The part rises to the back side and becomes wrinkled.
In addition, since the claws are arranged at equal angles, the wrinkles are distributed evenly in the direction along the edge of the corner. There will be an incorporation.

After this, it is possible to take out the leather etc. from the shirring device without retracting the claws, but in order to prevent the claws from stretching some of the wrinkles in the shirring area, the claws should be moved to the retracted position. It is preferable to take out the leather etc. from the shirring device after retracting the shirring device.

According to the above configuration, if the quality of the leather, etc., such as thickness and hardness, is uneven, the leather, etc. pressed by the nails will not be pressed evenly, and the size of wrinkles etc. will be uneven. There is a risk that

However, in the present invention, when a claw receiver is provided, the folded leather or the like is inserted between the claw receiver and the claw during shirring, so that wrinkles are formed as if by pressing. . As a result, the parts where the back sides are glued together are arranged evenly along the edge of the corner part by the claws, while the part wrinkled by the claw receiver is the inner edge of the folded ear part. They are evenly arranged along the middle of the part to be bonded to ensure uniform scorching.

Note that it is necessary to pull out the pawl receiver from between the creases after shirring, but this extraction of the pawl receiver may be performed manually or automatically by a pawl receiver driving means.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a side view of a shirring device according to an embodiment of the present invention, FIG. 2 is a plan view of the shirring device, and FIG. FIG. 4 is a plan view showing the arrangement, FIG. 4 is a longitudinal side view of the shirring device in its initial state, and FIG. 5 is a view of the shirring device holding the leather and core material and before starting shirring. FIG. 6 is a vertical side view of the shirring device when the nail is advanced, FIG. 7 is a schematic diagram showing the relationship between the pawl and the pawl receiver when the nail is advanced, and FIG. 9 is a longitudinal sectional side view of the shirring device when the pawl and pawl receiver are located at their respective retreated positions after shirring, FIG. 9 is a compressed air circuit diagram of the shirring device, and FIG.
The figure is a timing diagram showing the operation timing of each part of the shirring device.

This shirring device includes a holding means 1 that holds the leather R and the core material C which are stacked on the front and back sides, and a holding means 1 that holds the leather R and the core material C at predetermined positions corresponding to the curvature radius of the corner portions thereof. A position regulating device 2 for positioning, a plurality of (10 in this case) claws 3 for folding the leather R held by the holding means 1 and the corner portions of the leather R at the corners of the core material C to the back side of the core material C.
and a pawl driving device 4 that drives each pawl 3 forward and backward at the same time.
, a claw position adjusting means 5 for adjusting the position of each claw 3 with respect to the holding means 1 in accordance with the radius of curvature of the corner portion of the leather R and the core material C; and the leather R and the core material C held by the holding means 1. A plurality of (nine in this case) pawl receivers 6 are provided movably between the tip ends of the pawls 3 advanced to the corner portions of the pawl receivers 6, and a pawl receiver drive means 7 for simultaneously driving each pawl receiver 6 forward and backward. We are prepared.

The holding means 1 includes a horizontal base frame 8a
It is composed of a table 10 supported so as to be movable up and down via a lift adjustment screw 9, and a cylinder device 11 provided opposite to the table 10. Base frame 8a
A gate-shaped cylinder support frame 8b is provided on the upper surface, and a covered cylindrical guide frame 8c for the pawl receiving drive cylinder is fixed approximately at the center of the upper side of the cylinder support frame 8b.

The cylinder body 12 of the cylinder device 11 is fixed downward to the upper side of the guide frame 8c, and its piston rod 13 penetrates the upper cover wall of the guide frame 8c to move in and out of the guide frame 8c. . A cylinder body 14 of the pawl receiver driving means 7 is fitted into the guide frame 8c so that it can be raised and lowered in a downward direction.
is fixed. Furthermore, a presser metal fitting 17 is fixed to the lower side of this block 15 via an extension rod 16. Guide grooves 18 for preventing rotation are formed in both front and rear sides of the peripheral wall of the guide frame 8c, and both front and rear ends of a joint fitting 19 that passes through the upper part of the cylinder body 14 are slidably inserted into these guide grooves 18. I have let you. Both front and rear ends of the joint fitting 19 are made to protrude outside the peripheral wall of the guide frame 8c, and are adapted to receive the spring bearing ring 20 on the lower surfaces of the front and rear protrusions. A return spring 21 is inserted between this spring bearing ring 20 and the upper surface of the cylinder support frame 8b,
The elastic force of the return spring 21 causes the upper end surface of the cylinder body 14 to be pressed against the lower end of the piston rod 13.

Note that the structure of the holding means 1 is not limited to the above structure, and for example, the cylinder body 14 of the pawl receiver drive means 7 is fixed to the lower end of the piston rod 13 of the cylinder device 11, and the spring receiver ring 20 and the return It is possible to adopt a structure in which the spring 21 is omitted. In addition, a cam driven by a motor may be used in place of the cylinder device 11, an electromagnetic actuator such as a solenoid may be used, or a holding device such as a balloon that expands and contracts by supplying and discharging compressed air or pressure oil may be used. Various known driving means for driving the 17 up and down can be employed.
However, here, the cylinder device 11 is adopted, which has a simple structure, reliable operation, and can obtain a relatively strong driving force even though it is small. Also,
The driving source of this cylinder device 11 is not particularly limited, and compressed air, pressure oil, or electricity can be used as the driving source, but here, there is no risk of contaminating the surroundings, and the cylinder body 1
Compressed air, which can simplify the structure of 2, is used as the driving source.

As shown in FIGS. 2 and 3, the position regulating tools 2 are arranged on both sides of the table 10 on the base frame 8a, and each position regulating tool 2 is connected to a ruler 22.
and a moving block 23 that supports this so that it can be raised and lowered.
Equipped with. Each moving block 23 is formed with a long hole 24 extending back and forth, and the position is adjusted back and forth by loosening a fixing bolt 25 that is inserted into this long hole 16 and screwed onto the base frame 8a. By tightening the bolt 25, it is fixed to the base frame 8a. The ruler 22 of each position regulating device 2 has a similar structure and is supported by a moving block 23 via a fixing bolt 26 so as to be vertically adjustable. Each ruler 22 is formed with a position regulating surface 22a consisting of a diagonally forward inward inclined surface that extends at right angles to each other, and both sides of the corner portion of the prepared leather R and core material C are formed on these position regulating surfaces 22a. By abutting the linear edges of the leather R and the core material C, it is possible to position the leather R and the core material C so that the semi-center of curvature of the corner portion thereof is located on or near the longitudinal central axis of the holding means 1. . Incidentally, a guide groove 27 for guiding each moving block 23 is formed on the upper surface of the base frame 8a, if necessary.

Ruler 22 and moving block 23 of position regulating tool 2
The position adjustment mechanism is not particularly limited to this structure, and for example, adjusting bolts supported on both left and right sides of the table 10 on the base frame 8a so as to be threadable in the front and back direction are provided, and the position adjustment mechanism of the base frame 8a is
In the structure shown above, one end of each adjustment bolt is rotatably connected to each moving block 23 provided on both left and right sides of the table 10 so as to be movable forward and backward, and each moving block 23 is connected to the table 10 on the base frame 8a. The adjustment bolts are provided on both left and right sides so as to be movable forward and backward, and are supported by the front surface of the moving block 23 so as to be able to move forward and backward, and the rear ends of the adjustment bolts are brought into contact with the rear ends of the adjustment bolts, while pressing the movement block 23 toward the adjustment bolts from behind. Any conventionally known structure of the position adjustment mechanism, such as a structure provided with a presser spring, can be freely adopted. The same applies to the height adjustment structure of the ruler 22.

Base plate 8a at the rear of the table 10
A guide block 28 for guiding the forward and backward movement of the claw 3 is fixed to the upper surface. This guide block 28
Guide holes 29 are formed therein and are arranged radially at equal angles around the vertical center axis of the holding means 1, and each claw 3 is slidably inserted into the guide holes 29.

The pawl driving device 4 is supported by the base plate 8a further behind each pawl 3 via a pawl position adjusting means 5 so as to be movable toward the longitudinal central axis of the holding means 1. The pawl driving means 4 is divided into two parts symmetrically across the front and rear center line, and includes a pair of slide blocks 30 that each receive the rear ends of half of the pawls 3, and guide blocks 31 that guide the forward and backward movement of each slide block 30. A cylinder 32 that advances each slide block 30 toward the longitudinal central axis of the holding means 1, and a cylinder 32 that moves each slide block 30 upright on the upper surface of the slide block 30 on an extension line of each pin 33 and each claw 3. A return spring 35 is provided across each of the provided pins 34. Each of the above cylinders 32
are fixed to the rear surface of the guide block 31, and the tips of their piston rods 36 are received at the center of the rear surface of the corresponding slide block 30. A free roller 37 is rotatably attached to the rear end of each pawl 3, which is received on the front surface of the slide block 30, in order to reduce the contact resistance with the slide block 30.

Note that the structure of the pawl driving device 4 is not limited to this structure, and for example, a cam driven by a motor may be used instead of the cylinder 32, or an electromagnetic actuator such as a solenoid may be used.
It is also possible to use a balloon that expands and deflates by supplying and discharging compressed air or pressure oil. However, here, the structure is simple,
The cylinder 32 is used because it operates reliably and can provide relatively strong driving force despite its small size.
Further, the driving source of the cylinder 32 is not particularly limited, and compressed air, pressure oil, or electricity can be used as the driving source, but here, there is no risk of contaminating the surroundings, and the structure of the cylinder 32 is Compressed air, which is simple and has a common driving source with the holding means 1, is used as the driving string.

The claw position adjusting means 5 includes a base plate 8a.
a guide bar 38 fixed to the lower surface of the guide bar 38, a boss 39 fixed to the lower surface of the front end of the guide bar 38, and an adjustment bolt 40 rotatably inserted through the boss 39.
and an operating knob 41 fixed to the front end of the adjustment bolt 40, and is fitted into the guide block 31 of the pawl driving means 4 at the rear end of this guide bar 38 so as to be freely retractable. The rear end portion is threaded so as to be freely threaded, and by rotating the bolt 40 through the knob 41, the position of the pawl driving means 4 is adjusted forward or backward using the guide bar 38 as a guide. slide block 3
The position of each claw 3 received on the front surface of 0 can be adjusted.

However, the structure of the pawl position adjusting means 5 is not limited to the above structure, and for example, a regulating means for regulating both stroke ends of the piston rod 36 of the cylinder 32 or the pawl 3 may be provided to regulate at least one of the regulating means. It is also possible to adjust the position of the claw 3 by adjusting the position.

The pawl receiver 6 is provided so as to be movable back and forth between each pawl 3 located at the advanced position. That is, each pawl receiver 6 is swingably supported by the block 15 via a lever 42, and the pawls 3 in the advanced position and the folded leather are inserted between each pawl 3 in the advanced position as shown in FIG. R
The pawl receiver drive means 7 swings the pawl receiver to a retracted position that is further inside the corner than the ear.

The pawl receiver 6 is not particularly required to have the above-mentioned structure as long as it is provided so as to be movable between the respective pawls 3 located in the advanced position, and for example, it can be supported movably on the presser metal fitting 17. It is.

The pawl receiver driving means 7 is connected to the cylinder body 14.
and a piston 43 fitted therein so as to be able to rise and fall.
A cam 45 is fixed to the lower end of the piston 43 via a flange member 44, and an advancing drive spring 5 presses the upper end of the lever 42 against the cam 45.
8, a piston return spring 46, an advanced position limiting means 47 for limiting the advanced position of the pawl receiver 6, and a retreating position restricting means 48 for restricting the retracted position of the pawl receiver 6.

A notch 49 is formed on both front and rear sides of the lower end of the cylinder body 14 to allow a flange member 44 projecting from the piston 43 in the circumferential direction to move up and down. A through hole (not shown) is formed through which the through hole passes.

The cams 45 are provided in the same number as the pawl receivers 6 and the levers 42, and are provided so as to be adjustable in position in the radial direction centering on the vertical center line of the holding means 1, and are overlapped on the upper surface of the flange member 44. They are fixed in respective adjusted predetermined positions with bolts 44c via the matched presser plates 44b.

Both ends of the advancing drive spring 58 are connected to the flange member 44.
It is engaged with each pin 44a standing up on the left and right sides of the lever 42, and is arranged like a headband surrounding the upper end of the lever 42 from the outside, so that the upper end of the lever 42 is pressed against the cam 45 by its tension. It's on.

The piston return spring 46 is inserted into a spring receiving hole 57 recessed in the lower surface of the piston 43, and inserted between the inner bottom surface of the spring receiving hole 57 and the upper surface of the block 15.

The advancing position limiting means 47 includes an adjusting bolt 50 screwed into the block 15, a stopper 51 fixed to the upper end of the flange member 44 for receiving the upward surface thereof, and an operating member fixed to the lower end of the adjusting bolt 50. and a nut 53 for fixing the adjustment bolt 50, and by receiving the upward surface of the flange member 44 on the stopper 51, the piston 43 and the flange member 44 are fixed.
Also, the raising of the cam 45 is restricted, and the advancing position of the pawl receiver 6 is restricted.

The retreat position limiting means 48 includes an adjustment bolt 54 screwed into the block 15 and an operating knob 55 fixed to the lower end of the adjustment bolt 54.
and a nut 56 for fixing the adjustment bolt 54.
By receiving the inner bottom surface of the spring receiving hole 57 at the upper end of the adjustment bolt 54, the piston 4
3. The lowering position of the flange member 44 and the cam 45 is restricted, and the retracting position of the pawl receiver 6 is restricted.

The cylinder device 11 of the holding means 1, each cylinder 32 of the pawl driving means 4, and the cylinders 14 and 43 of the pawl receiver driving means 7 are connected to each other via directional control valves 59, 60, and 61, respectively, as shown in FIG. It is connected to a common compressed air supply source 62, and as shown in FIG.
starts supplying compressed air to the cylinder 1 of the pawl receiver drive means 7 while the pawl 3 is held in the advanced position.
4 and 43 to retract the pawl holder 6, then the cylinder 32 is depressurized and the pawl 3 is retracted, and then the cylinder device 11 is depressurized and the presser metal fitting 17 and the pawl holder 6 are raised. After that, the cylinders 14 and 43 of the pawl receiver driving means 7 are depressurized.
The cycle shirring work is completed.

Next, the preparation work for performing the shirring work using this shirring device will be explained.

In order to perform accurate shirring, the height of the table 10, the position of the position regulating device 2, the position of the pawl 3, and the position of the pawl receiver 6 must be adjusted as necessary as preparatory work. .

First, the height of the table 10 is determined by the elevation adjustment screw 9.
By rotating the , the thickness of the leather R and the core material C to be held by the holding means 1 is adjusted to correspond to the total thickness thereof. That is, when the presser metal fitting 17 is lowered by the cylinder device 11 of the holding means 1, the presser metal fitting 17 and the table 10
The distance between the leather R and the core material C is adjusted so that it is slightly smaller than the total thickness of the leather R and the core material C.

The position of the position regulating device 2 can be adjusted using the moving block 23.
and the height of the ruler 22. Adjustment of the position of the moving block 23 corresponds to the radius of curvature of the corner to be shirred so that the center of curvature is as close to the longitudinal center line of the holding means 1 as possible. adjusted so that it is located at The height of the ruler 22 is adjusted so that the workpiece placed on the table 10 is on the position regulating surface 22a.
The height can be adjusted to a position that can be adjusted by
For example, the lower edge of the position regulating surface 22a is
It is adjusted so that it touches the top surface of.

The position of the claw 3 can be adjusted by moving the claw 3 forward.
The claws 3 are adjusted so as to move forward and backward from the outside of the corner part to the inside of the folded ear part so that the ear part is folded back to the back surface of the core material C.

In this case, the adjustment bolt 40 is
The slide block 30 received by the piston rod 36 of the cylinder 32 is rotated to adjust the positions of the guide block 31 and the cylinder 32 toward the longitudinal central axis of the holding means 1.
The position of the pawl 3 is adjusted through the .

The position of the pawl receiver 6 is adjusted by the advancing position limiting means 47 and the retreating position limiting means 48, and the pawl receiver 6 advances a little inside from the outer edge of the corner part and retreats to the inside of the folded ear part. adjusted so that That is, when the radius of curvature of the corner portion is relatively large, by positioning the stopper 51 of the advance position limiting means 47 higher than the block 15, the piston 43, the flange member 44, and the cam 4
5 is set high, the upper end of the lever 42 is swung closer to the longitudinal center axis of the holding means 1, and the advanced position of the pawl receiver 6 is set farther from the longitudinal center axis of the holding means 1. Ru. In this case, if the adjustment bolt 54 of the backward position limiting means 48 is screwed upward, the bottom surface of the spring receiving hole 57 will be received by the adjustment bolt 54 at a position higher than the block 15, and the piston 4
3. The lower limit of the flange member 44 and the cam 45 becomes higher, the upper end of the lever 42 swings toward the vertical center axis of the holding means 1, and the claw receiver 6 moves to the retracted position. becomes far from the longitudinal central axis of the holding means 1. When the radius of curvature of the corner portion is relatively small, the stopper 51 of the advancing position limiting means 47 is positioned lower than the block 15, so that the advancing position of the pawl receiver 6 is brought closer to the longitudinal central axis of the holding means 1. , the adjustment bolt 54 of the retreating position limiting means 48 is screwed back upwards so that the claw receiver 6 is at the retreating position of the holding means 1.
can be brought close to the vertical central axis of

After adjusting the position of each part in this manner, the shirring device is returned to its initial state. That is, as shown in FIG. 4, the claw 3 is returned to the retracted position, the cylinder device 11 of the holding means 1 is shortened to raise the presser metal fitting 17 higher from the table 10, and the claw receiver 6 is moved to the forward position. let

Thereafter, by setting the corners of the prepared leather R and the core material C at predetermined positions along with the position regulating tool 2, and operating a start button (not shown), compressed air is supplied to the cylinder device 11 of the holding means 1. The presser metal fitting 17 is lowered, and the leather R and the core material C are placed between it and the table 10 as shown in FIG.
is pinched. In this way, with the leather R and the core material C held in predetermined positions by the holding means 1, compressed air is supplied to the cylinder 32 of the claw driving means 4, and the claws 3 advance as shown in FIG. driven into position. Then, the selvage portion of the leather R is folded back onto the back surface of the core material C and adhered with adhesive or adhesive. As shown in FIG. 7, the folded selvage portion of the leather R is sandwiched between the claw 3 and the claw receiver 6, forming wrinkles with exactly even pitches.
If the spacing between the claws 3 is made exactly equal, even wrinkles can normally be formed even if the claw receiver 6 is omitted, but if the thickness, hardness, etc. of the leather R are uneven, even wrinkles cannot be formed. Sometimes it cannot be formed. However, the claw receiver 6
In this case, the wrinkles are embossed by the claws 3 and the claw receivers 6, so that wrinkles can be prevented from becoming uneven due to non-uniformity of the leather R.

Thereafter, the cylinder 32 of the pawl driving means 4 is depressurized and the pawl 3 is retracted to the retracted position by the return spring 35, and the cylinders 14, 43 of the pawl receiving driving means 7 are
After compressed air is supplied to drive the pawl receiver 6 to the retracted position, the cylinder device 11 of the holding means 1 is depressurized, the presser metal fitting 17 is raised, and the workpiece is taken out. In this way, shirring portions having uniform wrinkles can be formed at the corner portions of the leather R as shown in FIG. 12.

〔Effect of the invention〕

As described above, according to the present invention, the leather or the like is positioned by the position regulating device and held in that position by the holding means, and the claws are operated to fold back the corners of the leather or the like to the back surface thereof. It is glued and shirred. Here, the claws simultaneously advance from radial directions at equal angles toward the center of the holding device, and move the corners of the leather, etc. at equal intervals along the edge thereof toward the center of the corner or its vicinity. Since each claw is pressed, it is possible to form a shirred portion with an excellent appearance in which wrinkles of equal size are lined up at equal intervals.

Furthermore, according to the present invention which includes a claw receiver, even when it is not possible to achieve uniform shirring with the claws alone due to uneven quality of the leather, the claw and the claw receiver can be used to press the pattern. Since the wrinkles are formed in this way, it is possible to ensure uniform scorching in the direction along the edge, and it is possible to obtain a product with high commercial value.

[Brief explanation of the drawing]

FIG. 1 is a side view of a shirring device according to an embodiment of the present invention, FIG. 2 is a plan view of the shirring device, and FIG. 3 is a plan view showing the arrangement of the position regulating device, pawl, and pawl driving means. Figure 4 is a vertical side view of the shirring device in its initial state, Figure 5 is a vertical side view of the shirring device holding leather and core material before starting shirring, and Figure 6 is a vertical side view of the shirring device in its initial state. A longitudinal side view of the shirring device when the nail is advanced; FIG. 7 is a schematic diagram showing the relationship between the pawl and the pawl receiver when the pawl is advanced; FIG. FIG. 9 is a compressed air circuit diagram of the shirring device; FIG. 10 is a timing diagram showing the operation timing of each part of the shirring device; FIG. 1 and 12 are perspective views showing a conventional method of folding back a corner portion of leather or the like. In the figure, 1... holding means, 2... position regulating device, 3...
Claw, 4... Claw driving means, 5... Claw position adjusting means, 6...
Claw holder.

Claims (1)

[Scope of Claims] 1. A holding means for holding leather, etc.; a position regulating device for positioning the holding position of the leather, etc. in accordance with the radius of curvature of its corner portion; , and along the back side of the leather, etc. held by the holding means, a retracted position on the outside of the corner part of the leather, etc., and from the ear part of the leather, etc. that is folded back towards the center of the holding means. A shirring device for leather, etc., characterized by having a plurality of claws arranged so as to be movable forward and backward across an inner advancing position, and a claw driving device for driving each claw forward and backward at the same time. 2. A holding means for holding the leather, etc., a position regulating device for positioning the holding position of the leather, etc. in accordance with the radius of curvature of the corner portion thereof, and radially arranged at equal angle intervals around the holding means, and Along the back side of the leather, etc. held by the holding means, a retracted position outside the corner of the leather, etc. and an advanced position inside the ear part of the leather, etc. folded back towards the center of the holding means. A folded selvage of leather or the like is inserted between a plurality of claws that are arranged to move forward and backward, a claw drive device that drives each claw forward and backward at the same time, and each claw located at the advanced position. A device for shirring leather, etc., characterized by being provided with a nail receiver arranged with a space in between.