JPH0642919B2 - Material edge clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention has a structure in which a clamp body is attached to a rear end of cloth to be sewn by a sewing machine, and the attachment body is slid on a cloth support base together with the cloth. The present invention relates to a cloth end clamp device which applies tension to cloth to perform stable sewing.

[Conventional technology]

As a conventional cloth edge clamp device, for example, Japanese Patent Laid-Open No.
The technique described in No. 111147 will be described with reference to FIG.

In the figure, the sewing machine 1 is fixed in the cloth feed direction of a sewing machine table 2 as a cloth support, and the sewing start tip portions of two cloths W which are vertically stacked on a stitch forming portion 3 such as a needle and a feed dog are It is arranged so as to be in contact with the guide portion 4.

Reference numeral 5 denotes a clamp body that can be engaged with and released from the rear end portion W ₁ of the cloth W. The clamp body 5 slides the sewing machine table 2 together with an upper jaw portion 7 having a needle 6 fixed downward at its tip. The upper jaw 7 has a needle 6 rotatably mounted on the rear end of the upper jaw 7 so that the needle 6 can be rotated up and down, and the needle 6 is lowered to the rear end W ₁ of the cloth W. When the jaw portion 7 and the sliding portion 8 are fitted together by being inserted, the jaw portion 7 and the sliding portion 8 are latched by a latch mechanism (not shown) to be engaged with the cloth W.
By rotating the releasing arm 9 standing upright from the back, the latch is released and the tip of the jaw portion 7 is raised, and the needle 7
Is removed from the cloth rear end portion W ₁ and the engagement state is released.

10 is a cable connected to the rear end of the clamp body 5,
The clamp body 5 is pulled in the reverse cloth feed direction by the weight 11. Reference numeral 12 is a releasing means having a lever 13 provided in front of the sewing machine in the cloth feeding direction, and 14 is a collecting means for receiving the clamp body 5 pulled by the weight 11 in the reverse cloth feeding direction.

Now, it is assumed that the front end of the cloth W is supplied to the stitch forming portion 3 of the sewing machine 1 on the sewing machine table surface, and the clamp body 5 is supported by the cloth rear end portion W ₁ . If you drive sewing machine 1 here,
The cloth W moves in the cloth feeding direction A, and the clamp body 5 slides on the sewing machine table surface while pulling up the weight 11 in accordance with the movement. This makes it possible to apply tension to the cloth W and stabilize the overlapped stitches. The seam formation is W _{1 at the} rear end of the cloth.
When reaching the vicinity, the release arm 9 contacts the lever 13 and rotates rearward, the clutch is released, and the clamp body 5 cloth rear end W
_The lock with ₁ is released. Then, the clamp body 5 is pulled back in the reverse cloth feed direction by the cable 10 by the weight 11, and is received by the collecting means 14. After that, the clamp body 5 in the collecting means 14 is attached to the rear end portion W ₁ of the cloth W to be used for the next sewing, the front end portion of the cloth W is attached to the stitch forming portion 3 of the sewing machine 1, and the sewing operation is performed. Do.

[Problems to be Solved by the Invention]

However, the cable 10 is connected to the rear side of the clamp body 5, and when the clamp body is collected, the clamp body 5 is the new cloth to be sewn next time because the cloth W to be sewn next passes on the conveyance system path. It cannot be placed on the sewing machine table 2 until it returns to the collection means 14, and since one clamp body 5 is conventionally used repeatedly, until the clamp body 5 returns to the collection means, next. It was not possible to even attach the clamp body 5 to the new cloth W to be sewn, and during that time, the worker had nothing to do, and the work efficiency was lower than expected, and the work efficiency was low. The present invention has been made in view of the above problems, and the next cloth can be placed on the cloth support immediately after the cloth sewing work is completed, and the clamp body used for the front sewing work is returned. It is an object of the present invention to provide a cloth edge setting device with high work efficiency, which allows sewing work to be started by using another clamp body without waiting for the operation.

[Means for Solving the Problems]

In order to solve the above problems, the cloth end clamp body device according to the present invention is provided with the following means. That is, (a) the cloth to be sewn is moved on the cloth support base while being tensioned to the cloth conveyed by the sewing machine, and the cloth is sewn immediately before the end of the sewing operation. In a cloth edge clamp device, which includes a clamp body to be released, and a clamp body conveying means for returning the clamp body existing at the engagement release position to the cloth to the vicinity of the conveyance start position at the cloth rear end, A clamp body transporting means for transporting on a path deviating from the transport path and at least first and second clamp bodies are provided, and the first clamp body moves to the disengagement release position as the cloth rear end moves. At this time, the second clamp body is returned to the vicinity of the conveyance start position by the clamp body conveying means.

(B) It moves on the cloth support base while being attached to the rear end of the cloth to be sewn and applying tension to the cloth conveyed by the sewing machine, and the engagement with the cloth is released immediately before the end of the sewing operation. In the cloth edge clamp device, the clamp body conveying means is provided with a clamp body conveying means for returning the clamp body existing at the disengagement position with the cloth to the vicinity of the conveyance start position at the rear end of the cloth. , The clamp body having the base end located near the conveyance start position of the cloth rear end and the other end movable between the engagement release position and the lateral position deviating from the cloth conveyance path and moved to the engagement release position. Is supported near the other end and the clamp body is transferred to the vicinity of the base end.

(C) In the above (b), at least first and second clamp bodies are provided, and the second clamp body is clamped when the first clamp body moves to the engagement release position as the cloth rear end moves. It is assumed that the body has been returned to the vicinity of the transport start position by the transport means.

[Operation] According to the above clamp device, the clamp body moves together with the cloth being sewn while giving a predetermined tension, and after the engagement with the cloth is released immediately before the end of sewing, the cloth is conveyed by the clamp body conveying means. The next cloth can be placed on the cloth support base during the return because it is returned to the vicinity of the rear end of the cloth placed on the cloth support base via the system path deviating from the conveyance system path. And moreover,
By using a plurality of clamp bodies, while one clamp body is being returned, another clamp body can be attached to the cloth placed on the cloth support base to start the next sewing operation,
Work efficiency is greatly improved.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, a sewing machine table 16 serving as a cloth support is fixed with a sewing machine 15 forward in the cloth feeding direction, and the sewing machine 15 is provided with a stitch forming portion 15a formed by cloth feeding teeth or the like. A well-known cloth guide portion 17 is provided on the sewing machine table 16 in front of the sewing machine 16 in the feeding direction. The upper surface of the sewing machine table 16 is made of a magnetic material, and the vicinity of the cloth guide portion 17 is made of a non-magnetic material.

A and B are two clamp bodies that can be engaged with and disengaged from the rear end portion W ₁ of the double-layered cloth W. The clamp bodies have a sliding portion that slides on the sewing machine table 16 and a tip having a needle. It comprises a jaw part (not shown) whose part can be rotated up and down, and the jaw part is always held in the upper position by a spring. Further, a magnet is provided on the lower surface of the jaw portion so as to be able to come into contact with the sewing machine table surface 2. When the jaw portion is lowered to attach the magnet to the surface of the sewing machine table 16 made of an iron plate, the jaw portion is lowered by the attraction force of the magnet. Held in position.

Further, this magnet also acts as a sliding resistance that restricts the movement of the clamp bodies A and B by being attracted to the sewing machine table.

Reference numeral 18 denotes a first air alinder as a first conveying means, which is a sewing machine table 1 located in front of the cloth guide portion 17.
The clamp body located at the position P ₁ (release position) of the non-magnetic body in 6 is moved to the first retracted position P ₂ which deviates from the cloth conveyance route by the sewing machine 15. An electromagnet 18b is attached to the tip of the rod 18a so that the clamp body can be attracted and released. In addition, 19 is a stopper for stopping the clamp body at the first retracted position.

20 is provided on the side of the cloth conveying path by the sewing machine 15,
A _second stopper provided with the stopper 21 from the first retracted position P ₂ .
A belt conveyor as a second conveying means for conveying the clamping member to the retracted position P _3, constitute the clamping member transporting means with the first air cylinder 18. The conveyor 20 is installed on pulleys 22 and 23, and is driven by a motor 24. The second retreat position P ₂ is located on the side of the transport start position P at the rear end of the cloth, and the stopper 21 is provided at the rear end of the _second retreat position P ₂ so that the belt conveyor 20 can be used. The clamp body that has been conveyed is locked at the second retracted position. Also,
25 and 26 are the engagement release position P ₁ of the clamp body and the second
Is a sensor for detecting the presence / absence at the retracted position P ₁ and is constituted by a limit switch or an optical sensor.

Reference numeral 27 denotes a second cylinder, and the clamp body conveyed to the second retracted position P ₃ by the belt conveyor 20 is at the conveyance start position P _{4 at} the rear end of the cloth, or slightly rearward thereof, that is, near the operator's hand. It is designed to be pushed out.
Set the feed position of the clamp body to P at the transport start position at the rear end of the cloth.
_{If the} rear end of the cloth is attached to the clamp body at a position slightly rearward from ₄ , the clamp body will be pulled slightly forward by the cloth W when supplying to the sewing machine, and the cloth W is inevitably pulled. It has a tensioning effect.

Next, the operation will be described.

In this device, two clamp bodies A and B are used,
When one clamp body A is in the supporting position, the other clamp body B is engaged with the cloth rear end W ₁ and the sewing machine table 1
6 is moving relative to each other, or is located in the first retracted position P ₂ or the second retracted position P ₃ from the release position P ₁ in an associated arrangement, and in FIG.
The state is shown in the retracted position.

Here, first, the worker lowers the jaw portion so that the needle of the clamp body A penetrates the rear end portion W ₁ of the cloth W placed on the sewing machine table 16, and the magnet of the jaw portion is moved to the sewing machine table 16. It is made to adsorb with a magnet. After that, the front end of the cloth W is attached to the stitch forming portion 15a of the sewing machine 15, the cloth W is set so as to be aligned with the cloth guide portion 17, and a sewing machine starting switch (not shown) is turned on. The sewing machine 15 is started by a machine (not shown) (step 1). After that, the sewing is automatically performed even if the worker does not touch the cloth W.

At this time, the clamp body A is conveyed along with the cloth W,
Since the clamp body A slides while being attracted to the sewing machine table 16 by the magnet, a predetermined tension is generated on the cloth W, the cloth W is conveyed in a stable state without waviness, and proper sewing is performed.

After that, the sewing operation proceeds, and the rear end of the cloth is sewn by the sewing machine sewing section 1.
When the clamp body A reaches the release position P ₁ in the vicinity of 5a, since the sewing machine table surface at the release position P ₁ is made of a non-magnetic material, the jaw portion of the clamp body A is raised and the needle is clothed. It is removed from W and the engagement with the cloth W is released. At the same time, the sensor 25 is turned on.
Upon receiving this ON signal, the CPU turns on the electromagnet 18b and causes the rod 18a to project and retract. As a result, the clamp body A in the release position is joined and attracted by the electromagnet 18b protruding together with the rod 18a, and is then conveyed to the first retracted position P ₂ on the belt conveyor 20 by retreating the rod 18a. . The electromagnet 18b
Turns off at the same time as the backward movement (steps 3 and 4).
After the cloth sewing operation is completed, the CPU receives a signal from a cloth detection sensor (not shown) and stops the driving of the sewing machine. Next, the CPU turns on the belt drive motor 24 to operate the belt conveyor 20, and conveys the clamp A from the first retracted position to the second retracted position (step 5).

When reaching the second retracted position P ₃ , the clamp body A abuts against the stopper 21 and is locked, and the sensor 26 is turned on. When the sensor 26 is turned on, the CPU turns off the motor 24 (steps 6 and 7).

After that, the CPU determines whether or not a new sewing operation of the cloth W is being performed by activating the sewing machine 15 (step 8). When it is determined that the sewing machine 15 is activated, the clamp body B is newly added. A time timer required to reach a predetermined position, the release position P _1, etc. on the way of moving according to the cloth is made to wait (step 9). This timer may be replaced with a sensor that detects that the clamp body has been moved to a predetermined position. When the waiting time elapses, the CPU operates the air cylinder 27 to push the clamp body A slightly rearward from the second retracted position P ₃ to the conveyance start position P _{4 at the} rear end of the cloth,
Thereafter, the operator uses the clamp body A to further perform the next sewing operation.

As described above, in the above embodiment, the clamp body used at the time of sewing is deviated from the cloth conveying path, that is, the release position P ₁ , the first retracted position P ₂ , and the second retracted position P ₃ are passed through. Since the cloth is fed back to the rear end of the cloth, the operator can place the next cloth together with other clamp bodies on the sewing machine table 16 at the same time as the sewing of the first cloth is completed, and the work time is lost. There is no problem, and the sewing work can be repeated extremely efficiently.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 to 6.

In the figure, on a mounting base 30 fixed to the rear part of the sewing machine table 16, a long side which is horizontally rotatable about a shaft body 31 provided at a position deviated from the cloth conveying system is substantially long. A belt support member 32 formed in an L shape is provided, and a rear short portion 32b as a short side of the member 32 has
A cylinder rod 33a of an air cylinder (piece moving means) 33 having one end pivotally mounted on a mounting base 30 is rotatably connected, and the tip end portion 32a of the belt support member 32 is moved forward and backward by the cylinder rod 33a. Rotates by a predetermined angle θ as shown in FIG. 4 and moves between the side edge of the first retracted position P _{12 and} the side edge of the release position P ₁₁ . Further, two pulleys 34 and 35 are axially attached to the vector support member 32,
Further, a metallic endless belt (clamp body conveying means) 36 is wound around the pulleys 34 and 35. The pulley 35 is rotated by a motor 38 mounted on the upper surface of the belt support member 32 via a motor placket 37, and this rotation causes the endless belt 36 to move to both pulleys 34,
Rotate between 35 in the direction of arrow d. Also in this embodiment, two Kunlamp bodies A ₁₁ and B ₁₁ having the same fastening mechanism as in the first embodiment are used, and a magnet is attached to one side surface of each of them.

Next, the operation will be described based on the flowchart of FIG.

When the cloth W is attached to the sewing machine 15 and the activation switch is turned on as in the first embodiment, the sewing operation is started (step 11) and the clamp body A ₁₁ moves together with the cloth W together with the cloth W.

At the time when the sewing operation is started, the air cylinder 33 becomes O
Has a FF, are spaced laterally from the belt support member 32 is a tip member 32a is released position P _11.

Then, when the sewing operation progresses and the clamp body A ₁₁ reaches the release position and the engagement is released from the cloth rear end, the same sensor (not shown) in the cloth guide portion as that shown in the first embodiment is used. ) Is turned on, and in response to the ON signal, the CPU (not shown) turns on the cylinder 33 to turn on the cylinder rod 33.
a is sucked (step 13), and the belt support member 32
To position the tip portion 32a on the side of the release position _{P 11,}
As a result, the metallic endless belt 36 moves to the release position P ₁₁ and contacts the side magnet of the clamp A ₁₁ , and the magnetic force of the magnet causes the clamp body A ₁₁ to be attracted to the endless belt 36. After that, the CPU turns off the air cylinder 33,
The cylinder rod 33a is projected to return the belt support 32 to the initial position P ₁₁ (step 14).

On the other hand, at the same time when the belt support 36 starts the return operation, the CPU drives the motor 38 to move the endless belt 36 in the arrow d direction, and conveys the clamp body A ₁₁ attracted to the endless belt 36. Go (step 15). After this, the clamp body A ₁₁ moves to the conveyance start position P _{11 at the} rear end of the cloth.
When it is conveyed to the side position P ₁₁ of the
When the signal becomes N, the CPU stops driving the motor 38 in response to the ON signal (steps 16 and 17).

As described above, also in this embodiment, the clamp body A ₁ is returned via the path deviating from the cloth conveying path. That is, in this embodiment, the curb is drawn from the release position P ₁₁ to the outer side of the cloth transporting path and is returned to the second retracted position P ₃ . For this reason, the worker can perform the next setting or sewing operation of the cloth W by using the new clamp body B ₁₁ without waiting for the clamp body A ₁₁ used for the previous sewing to be returned. After the sewing operation of the next cloth W is started, the clamp body A ₁₁ is removed from the metallic endless belt 36 and used for the next sewing operation.

As described above, in the second embodiment described above, the clamp bodies A ₁₁ and B ₁₁ in the release position are conveyed along the conveyance path that draws a curved trajectory, but the tip end portion 32a of the belt support member 32 is released. The clamps A ₁₁ and B ₁₁ transferred to the release position P ₁ may be linearly transferred to the second retracted position P ₁₁ by being fixed to the side of the position P ₁ or the lower part of the sewing machine table. .

By the way, in the second embodiment, when the cloth to be sewn is moved linearly, the side surface of the clamp body A ₁₁ approaches the metallic endless belt 36, so that the clamp body A ₁₁ is reliably moved by the magnet. Adsorbed to the belt 36,
Although the clamp body A ₁₁ can be recovered accurately, as shown in FIG. 7A, when the cloth feed is performed in a curved manner, the clamp body A ₁₁ moves along the cloth feed direction. to be released, the angle α becomes large formed between the side surface of FIG. 7 (b) metallic endless as shown in the belt 36 and the clamp member a _11, without being adsorbed on the clamping member a ₁₁ is the belt 36, the recovery There was a risk that it would be impossible.

Therefore, in the third embodiment of the present invention shown in FIG. 8, the protruding portion 4 protruding laterally at the tip end portion of the belt supporting member 32.
By forming 0, the clamp body A ₁₁ at the release position P ₁₁ can be reliably collected. That is,
If the belt support member 32 rotates even if the curved cloth feed is performed and the angle α is released at the position where the angle α is large,
The protrusion 40 presses the tip portion of the clamp member A _11, for rotating the clamp member A ₁₁ to contraction direction of the angle alpha, the clamp member A ₁₁ reliably metallic endless belt 3
6 can be adsorbed, and the occurrence of an unrecoverable state is prevented.

Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the clamp body A ₁₁ conveyed by the metallic endless belt 36 is guided to a position on the sewing machine table 16 which is suitable for the clamping work. Less than,
The fourth embodiment will be described with reference to FIGS. 9 and 10.

In the figure, 41 is a clamp body guide provided on the belt support member 32. The clamp body guide 41 includes a guide plate 43 fixed to the support plate 42, a fixed base 44 inserted into the support plate 42, a guide member 45 fixed to the inner surface of the fixed base 44, and the fixed base 44. Threaded thumbscrew 4
6 and a stopper 47 protruding from the guide plate 43. The guide plate 43, the guide member 45, and the support plate 42 are movably fitted to the upper plate portion 32A of the belt support member 32. At the same time, by screwing in the thumbscrew 46, the thumbscrew 46 and the fixing base bottom surface 44a can firmly hold and fix the upper plate portion 32A. Further, the stopper 47 can rotate and change the set position about the screw 47 within the range of the elongated hole 47a. The other structure is the same as that of the second embodiment.

In the fourth embodiment, when the clamp body A ₁₁ conveyed by the metallic endless belt 36 reaches the tip portion of the guide plate 43, the clamp body A ₁₁ comes into contact with the oblique side portion 43 a of the guide plate 43 and separates from the metallic endless belt 36. After that, it moves along the hypotenuse portion 43a due to the inertial force at the time of conveyance, abuts on the stopper 47, and is reflected here to slightly move the stopper 4a.
It stops at a position separated from 7 (see FIG. 29). Then, by changing the set position of the clamp body guide 43 along the belt support member 32, the clamp body A can be easily
The stop position of ₁₁ can be freely changed in the front-back direction, and by changing the set angle of the stopper 47, the stop position of the clamp body A ₁₁ can also be changed in the axial direction (direction orthogonal to the cloth conveying direction). Therefore, the stop position of the clamp body A ₁₁ can be freely changed, and the clamp pair A ₁₁ can be always stopped at a position favorable for the clamp work regardless of the length of the cloth.

Further, according to this embodiment, the clamp pair A ₁₁ is separated and stopped by the metallic endless belt 36, so that the clamp body A ₁₁ is attracted to the metallic endless belt 36.
There is also an advantage that the clamp body A ₁₁ can be easily gripped as compared with the second embodiment in which the clamp stops.

In each of the above embodiments, the air cylinder 18 and the belt conveyor 20 are used as the transporting means for the clamp body.
Alternatively, the case where the metallic endless belt 32 is used has been described as an example, but the present invention is not particularly limited thereto, and other configurations can be applied.

Between the first retracted position P ₂ and the fabric subsequent conveyance start position P _4, for example as shown in the first embodiment, the first retracted position P ₂
Forming a slanted surface with the higher position as
It is also possible to provide a raising means for raising the clamp body to the retracted position and slide it along the clamp body and the inclined surface. Further, suspending means for suspending the clamp body is arranged between the positions, and the suspension is moved. It is also possible. That is, it is possible to move the clamp body not only on the horizontal plane but also three-dimensionally. In short, the clamp body may be conveyed on a route deviating from the cloth conveying route.

〔The invention's effect〕

As described above, according to the present invention, the next cloth can be placed on the cloth support base immediately after the cloth sewing operation is completed, and the clamp body used for the pre-sewing operation is returned. It is possible to start the sewing work by using another clamp body without waiting, and there is an effect that the productivity efficiency is significantly improved as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a plan view showing the first embodiment of the present invention, FIG. 2 is a flow chart showing the operation of the one shown in FIG. 1, and FIG.
FIG. 4 is a perspective view showing a second embodiment of the present invention, and FIG.
The top view which shows the operation state of what is shown in FIG. 5, FIG.
FIG. 6 is a side view of what is shown in the figure, FIG. 6 is a flow chart showing the operation of what is shown in FIG. 3, and FIG. 7 is an explanatory view showing a case where the cloth feeding is performed in a curved manner in the second embodiment.
FIG. 9 is a plan view showing a principal part of a third embodiment of the present invention, FIG. 9 is a plan view showing a fourth embodiment of the present invention, and FIG. 10 (a) is an enlarged plan view of a principal part of FIG. The figure, the same figure (b) is a side view of what was shown in the same figure (a), and FIG. 11 is a perspective view which shows the conventional cloth end clamp apparatus. W ... fabric P 1 _... engaging release position P 2 _... first retracted position P 3 _... second retraction position P 4 _... cloth rear conveyance start position A, B ... clamping member 18 ... air cylinder (first Conveying means 20 ... Belt conveyor hair (second conveying device) A ₁ , B ₁ , A ₁₁ , B ₁₁ ... Clamping body P ₁₁ ... Disengagement release position 36 ... Metal endless belt (clamping body conveying means 31 ... Shaft) Body 32 ... Belt support member 33 ... Air cylinder (driving means) 40 ... Projection portion 41 ... Clamp body guide

Claims (3)

[Claims] 1. A cloth that is to be sewn is moved on a cloth support base while being tensioned to the cloth conveyed by a sewing machine and is fastened to the cloth immediately before the end of the sewing operation. In a cloth edge clamp device, which includes a clamp body to be released, and a clamp body conveying means for returning the clamp body existing at the engagement release position to the cloth to the vicinity of the conveyance start position at the cloth rear end, A clamp body transporting means for transporting on a path deviating from the transport path and at least first and second clamp bodies are provided, and the first clamp body moves to the disengagement release position as the cloth rear end moves. A cloth edge clamp device characterized in that the second clamp body is sometimes returned to the vicinity of the conveyance start position by the clamp body conveying means. 2. A cloth that is to be sewn is moved on a cloth support base while being tensioned to the cloth conveyed by a sewing machine, and the cloth is fastened immediately before the end of the sewing operation. A cloth body clamp device including a clamp body to be released, and a clamp body conveying means for returning the clamp body existing at the engagement release position with respect to the cloth to the vicinity of the conveyance start position at the rear end of the cloth. Is a clamp that moves to the disengagement release position by disposing the base end near the conveyance start position of the cloth rear end and moving the other end between the engagement release position and the lateral position deviating from the cloth conveyance path. A cloth end clamp device, which supports a body near the other end and transfers the clamp body to the vicinity of the base end. 3. At least first and second clamp bodies, wherein the second clamp body is moved by the clamp body transporting means when the first clamp body moves to the disengagement release position as the cloth rear end moves. The cloth end clamp device according to claim 2, wherein the cloth end clamp device is returned to the vicinity of the conveyance start position.