JP2734126B2 - Sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In the present invention, a sewing piece is bent in a predetermined order, and the sewing piece is supplied to a sewing machine to perform sewing. About the machine.

[Prior art] In a conventional sewing machine, based on operation of a foot pedal,
There is one in which a plurality of operations described below are continuously and automatically performed to sew a sewn piece on a work cloth. That is, (a) the operation of holding the sewing pieces on the template of the bending supply device, and (b) moving the held sewing pieces below the presser plate of the sewing machine, and An operation of sandwiching a sewn piece therebetween and bending a part of the sewn piece protruding laterally from both plates, (c) an operation of setting the folded sewn piece on a work cloth, (d) Sewing operation of sewing pieces.

[Problems to be Solved by the Invention] However, in the above-described device, it is necessary to perform the foot pedal operation a plurality of times in order to start each operation, which is not only complicated, but also requires sewing. During the sewing of the pieces, the entire operation of the bending supply device is stopped, so that the preparation operation of the sewing piece to be sewn next cannot be performed, for example, the operation described in (a) above cannot be performed. There was a problem that the cycle time required from preparation of the sewing piece to sewing was long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to start preparation of a next sewing piece to be sewn during sewing operation of a sewing piece. In order to provide a sewing machine capable of shortening the cycle time required from preparation to sewing, and reducing the number of operations of an input device such as an operation pedal to reduce the burden on an operator. is there.

Means for Solving the Problems In order to achieve the above object, according to the present invention, a stitch forming apparatus including a needle which is moved up and down, and a feeder which is arranged on a bed surface and on which a work cloth can be placed A presser plate which is moved between an operation position for pressing a sewn piece supplied on the plate and its work cloth toward the feed plate and the bed surface, and an inoperative position which is separated upward from the operation position. A sewing machine having a feeder that is moved relative to a needle, a template on which a sewing piece to be supplied to the feeder is placed, and a sewing piece placed on the template being pressed. A holding position that is switched between a holding position for holding and a retracted position retracted from the holding position, and a supply position that enters between the feed plate and the holding plate, and is separated from the supply position to side sewing. A sewing piece supply device that is switched to a standby position and the feed plate; And a folding device provided with a bending piece for bending a sewing piece inserted and arranged between the holding plate and the press plate to surround the template. An input device for inputting signals for operating the stitch forming device, the feed device, the sewing piece supply device, and the bending device; and a standby position while the input signal from the input device is continued. The holding piece of the sewing piece supply device is arranged at the retreat position, the holding piece is switched to the holding position by interrupting the input signal from the input device, and the sewing piece supply device is moved to the supply position by the subsequent input signal. Then, the folding device is driven by the subsequent input signal to bend the sewn piece, and the sewn piece supply device is moved to a standby position. Sewing movement by device When an input signal from the input device is input during the sewing operation of the sewing machine by the first control device, the stitch forming device, and the feed device, the standby is performed during the sewing operation while the input signal is continued. The holding piece of the sewing piece feeding device placed at the position is arranged at the retreat position, the holding piece is switched to the holding position by interrupting the input signal, and the sewing piece feeding device stands by after the sewing operation is completed. A second control device for moving from the position to the supply position.

[Operation] While the input signal from the input device is continuing, the first control device arranges the holding piece of the sewing piece supply device arranged at the standby position at the standby position, and holds the cut piece by blocking the input signal from the input device. The pieces are switched to the holding position, the sewing piece supply device is moved to the supply position by a subsequent input signal, and the folding device is driven by the subsequent input signal to bend the sewing pieces. Move the feeding device to the standby position,
Further, the sewing operation is executed by the stitch forming device and the feed device according to the subsequent input signal. Also, when an input signal is input from the input device during the sewing operation of the sewing machine by the stitch forming device and the feed device, the second control device is disposed at the standby position during the sewing operation while the input signal is continued. The holding piece of the sewn piece feeding device is placed in the retreat position, the holding piece is switched to the holding position by blocking the input signal, and the sewing piece feeding device is moved from the standby position to the feeding position after the sewing operation is completed. Move.

Therefore, during the sewing operation by the stitch forming device and the feed device, the operation of the input device enables the preparation work of the next sewing piece, and the cycle time until one sewing piece is sewn. Can be shortened. In addition, since the preparation work of the next sewing piece is based on the premise of active operation by the input device, it is determined whether or not the worker prepares the next sewing piece by a skilled person or an unskilled person. Can be achieved, and the cycle time can be significantly reduced depending on the skill level. Further, it is not necessary to newly provide an input device for driving the holding piece for the preparation operation during the sewing operation, and the operation mode is the same as that of the case where the normal holding piece is driven. Therefore, the operator can perform the operation with the same feeling as usual, so that an operation error can be prevented while suppressing an increase in cost due to an increase in the number of input devices.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 2 to 4, a stitch forming apparatus N including a needle 2 which is moved up and down is provided on an arm 1 of the sewing machine. Feeder F for relatively moving the work cloth W1 such as
Is provided. The feeder F includes a feed plate 6 on which the work cloth W1 and a sewn piece W2 such as a label and a name are placed on the upper surface of the bed portion 4. A pressing plate 7 is provided which can be switched between an operating position for pressing the cloths W1 and W2 and an inoperative position separated upward from the operating position. Further, the feeder F is provided with an outer presser foot 7a which is moved up and down similarly to the presser plate 7 in order to press the work cloth W1 against the feeder plate 6 near the presser plate 7.
It has.

On the upper surface of the arm portion 1, a support 8 of the sewing piece supply device S is attached.
Are mounted so as to be rotatable via a support arm 11, and the mounting plate 10 and the support arm 11 are moved to the operating position shown by a solid line in FIG. It can be switched to the use position. A support frame 12 is attached to a support arm side end of the mounting plate 10 at a base end thereof, and a pair of guide shafts 13 extending in the same direction as the support arm 11 in the support frame 12.
Has been erected. A moving body 14 is supported on both guide shafts 13 so as to be able to reciprocate.

The movable body 14 has a pair of operating shafts orthogonal to the two guide shafts 13.
15 is mounted so as to be integrally movable via a connecting body 16, and a piston 18 of a template plate vertical air cylinder 17 mounted on the connecting body 16 is connected to the moving body 14. A template 19 for mounting the sewing piece W2 is attached to an end of each of the operation shafts 15 via a connecting body 20. A rotating body 21 is supported by the connecting body 20 so as to be rotatable around a support shaft 22, and the rotating body 21
A pressing spring 23 extending upward from the template 19 is attached to 21, and based on the rotation of the rotating body 21, the pressing spring 23 presses and holds the sewing piece W2 on the template 19, and The inoperative position is switched from the operating position to an inactive position that is separated upward.
A press spring air cylinder 24 for switching the position of the press spring 23 is provided on the connecting body 20 via a rotating body 21.
Is mounted, and its piston 25 is connected to the rotating body 21.

Further, as shown in FIG. 5, a front / rear air cylinder 26 is mounted on the mounting plate 10, and a piston 27 is connected to the moving body 14. And the sewing piece supply device S
When the piston 18 of the mold plate vertical air cylinder 17 is moved in and out in a state where the mounting plate 10 of FIG. 2 is disposed at the use position shown in FIG.
The template 19 is reciprocated vertically between the first position (standby position) shown by a solid line in FIG. 6 and the second position shown by a two-dot chain line in FIG. When the piston 27 of the air cylinder 26 is moved in and out, the moving body 14 and the operating shaft 15 are moved.
The template 19 is reciprocated in the front-rear direction between the second position shown by the two-dot chain line in FIG. 6 and the third position (supply position) shown in FIG. You.

As shown in FIGS. 2 and 4, an operating body 31 of a bending device B is supported at the base end of the support base 8 so as to be movable along the mounting plate 10, and the bending piece is vertically moved. Air cylinder
32 is mounted, and its piston 33 is connected to the operating body 31. A pair of rocking arms 34 are supported at the base end of the operating body 31 so as to be rockable, respectively, and a bending piece 35 for bending the sewing piece W2 is located at the tip of each rocking arm 34. Adjustably mounted. A cam groove 36 is formed on the inner edge of the center of each swing arm 34, and the mounting plate
A pair of rollers 37 that engage with the respective cam grooves 36 are mounted on the pair 10 via support pieces 38.

An air cylinder 40 having a pair of pistons 39 is suspended and fixed to the operating body 31.
Engagement pieces 41 that engage with 39 are respectively provided to protrude. A spring 42 for urging the swing arms 34 in a direction approaching each other is stretched between the engagement pieces 41. As shown in FIG. 4, when each of the air cylinders 32, 40 is not operated, each of the pistons 33,
In a state in which 39 is located at the immersion position, each swing arm 34 is located at an upper position via the operating body 31, and the shallow groove portion of the cam groove 36 is engaged with each roller 37 based on the urging force of the spring 42. At the same time, each engagement piece 41 is engaged with the piston 39, and each bent piece
35 is held open.

As shown in FIG. 1, the sewing machine according to this embodiment is a first sewing machine.
A microcomputer constituting the second control device (hereinafter referred to as a microcomputer)
A predetermined signal is input to the microcomputer 51 based on depressing operations of a presser foot pedal 52 and a starting pedal 53 constituting first and second input devices. The presser foot pedal 52 outputs a predetermined signal in accordance with a two-step depression operation. Microcomputer 51
Has a plurality of programs for controlling the above-described devices, that is, the stitch forming device N, the feeding device F, the sewing piece supplying device S, and the bending device B in a predetermined order.

Also, air cylinders 17, 26, 24 for the template up / down, template front / back, and presser spring of the sewing piece supply device S are connected to the microcomputer 51 via control valve devices 54, 55, 56, respectively. I have.
Further, the microcomputer 51 is provided with air cylinders 32, 40 for bending and opening and closing the bending piece of the bending device B, and control valve devices 57, 58.
Connected to each other. Each control valve device 54
58 includes solenoid valves for controlling the supply of air to the corresponding air cylinders 17, 26, 24, 32, and 40, and the microcomputer 51 has a dip for switching all the solenoid valves from the operation ready state to the operation stop state. Includes switches and program select switches.

Then, in a state where each of the solenoid valves is switched to an operation preparation state by a dip switch, and a predetermined program is selected in advance by a program selection switch,
When the pedals 52 and 53 are operated, the microcomputer 51 controls the operations of the devices N, F, S and B according to the program and the input signals from the pedals 52 and 53.

Now, after the power is turned on to the sewing machine by the operator and a predetermined sewing program is selected, when the start pedal 53 is depressed, the microcomputer 51 operates the feed device F,
The holding plate 7 is moved along the upper surface of the bed portion 4 to
It is arranged at a predetermined position shown in the figure. After that, the microcomputer 51
Performs the following operations sequentially according to the operation of each pedal 52,53. (A) When the presser foot pedal 52 is depressed to the first step, the presser plate 7 and the outer presser foot 7a are raised to the inoperative position.

(B) When the start pedal 53 is depressed, the control valve device 56
The air cylinder 24 for the presser spring is actuated via, and the presser spring 23 is moved from the solid line position in FIG. 6 to the two-dot chain line position. While the depressing of the activation pedal 53 is continued, the presser spring 23 is held at the position indicated by the two-dot chain line. At this time, the operator can place the sewing piece W2 on the template 19.

(C) After the sewing piece W2 is placed, when the depressing of the starting pedal 53 is released, the presser spring 23 returns to the solid line position in FIG. Pressed and held.

(D) -1 When the presser foot pedal 52 is depressed again to the first stage, the template vertical air cylinder 17 is operated via the control valve device 54, and the template 19 is moved from the first position in FIG. It is lowered to two positions.

(D) -2 Next, the air cylinder 26 for front and rear of the template is actuated via the control valve device 55, whereby the template 19 is placed on the sewing piece W2 from the second position in FIG. 2 is moved backward to the third position shown in FIG. 2, and the sewing piece W2 and the template 19 are arranged below the presser plate 7.

(D) -3 Subsequently, the presser plate 7 is lowered onto the template 19, and the sewing piece W2 is clamped between the plates 7,19.

(D) -4 Next, the air cylinder 32 for vertically moving the bent piece is operated via the control valve device 57, and the piston 33 of the air cylinder 32 is protruded by about 1/2 of the operation stroke. The arm 34 is lowered through the engagement between the roller 37 and the shallow groove of the cam groove 36, and the two bent pieces 35 are moved downward from the position shown in FIG. 7A. Thereby, both side portions of the sewing piece W2 are bent downward. The deep groove of the cam groove 36 is
In this state, the folded piece opening / closing air cylinder 40 is operated via the control valve device 58, and the two folded pieces 35 are moved below the template 19 in the closing direction. Thereby, as shown in FIG. 7 (b), the sewing piece W2 is bent so as to surround the template 19.

(D) -5 Subsequently, the air cylinders 26 and 17 for front and rear and up and down of the template are sequentially operated, and the template 19 is returned to the first position via the second position in FIG. As is clear from FIGS. 7 (b) and (c), it is pulled out from the sewing piece W2. At this time, the sewing piece W2 is sandwiched between the holding plate 7 and each bent piece 35 by a spring force for urging the holding plate 7 downward.

(E) Next, when the presser foot pedal 52 is depressed to the first step, the outer presser foot 7a shown in FIG. 4 is lowered, whereby the work cloth W1 is fed near the area where the sewing piece W2 is sewn. The plate 6 is pressed.

(F) When the presser foot pedal 52 is further depressed to the second step, the piston of the air cylinder 32
At the same time that 33 is projected over all of its working strokes, the holding plate 7 of the feeder F is lowered. Thereby, each bent piece 35, the presser plate 7 and the sewing piece W1 are attached to the work cloth W1.
The work cloth W2 is pressed down integrally with the work cloth W2.

(G) -1 Next, when the starting pedal 53 is depressed, the folding piece opening / closing and vertical air cylinders 40, 32 are sequentially operated, and the folding pieces 35 return to the position shown in FIG.

(G) -2 Thereafter, the stitch forming device N and the feed device F of the sewing machine are operated, sewing is performed, and the sewing piece W2 is
Sewn on W1.

(G) -3 After the sewing is completed, the presser plate 7 and the outer presser foot 7a of the feeder F are raised and returned to the original position, and one sewing cycle is completed.

On the other hand, when the operator is proficient in using the sewing machine, in this embodiment, a new sewing piece W2 to be sewn next is inserted into the sewing machine (G).
The sewing machine can be supplied to the sewing machine during the sewing operation described in the section -2. That is, when the start pedal 53 is operated during the sewing operation, the microcomputer 51 operates the presser spring air cylinder 24. Therefore, the pressing and holding operation described in the above (B) and (C) can be performed.

Then, even after the pressing and holding operation of the new sewing piece W2, if the sewing operation is continued, the microcomputer 51 makes the template 19 stand by at the first position shown in FIG. At the same time as the sewing operation is completed, the microcomputer 51 raises the presser plate 7,
Thereafter, the operations described in the above (D) -1 to (D) -5 are automatically performed.

Therefore, in this case, the cycle time required from the preparation of the sewing piece to the sewing can be shortened to increase the production efficiency, and the number of pedal operations can be reduced to reduce the burden on the operator.

Further, in this embodiment, when it is not necessary to accurately position the work cloth W1 on the feed plate 6, the operation after the item (E) is automatically performed based on the switching operation of the program selection switch or the dip switch. It is also possible to set a program to be executed in step (D) -5 and start the operation by depressing the start pedal 53 after the operation of (D) -5.

[Effects of the Invention] As described above in detail, according to the present invention, during the sewing operation by the stitch forming device and the feed device, the operation of the input device can perform the preparation work of the next sewing piece. Thus, the cycle time until one sewing piece is sewn can be reduced. In addition, since the preparation work of the next sewing piece is based on the premise of active operation by the input device, it is determined whether or not the worker prepares the next work piece by a skilled person or an unskilled person. The cycle time can be greatly reduced depending on the skilled person. Further, it is not necessary to newly provide an input device for driving the holding piece for the preparation operation during the sewing operation, and the operation mode is the same as that of the case where the normal holding piece is driven. The operator can operate with the same feeling as usual,
Thus, an operation error can be prevented while suppressing an increase in cost due to an increase in the number of input devices.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control device of a sewing machine embodying the present invention, FIG. 2 is a side view showing a part of the sewing machine cut away, and FIG. 3 is a front view showing a sewing piece feeding device. , FIG. 4 is a front view showing the bending device, FIG. 5 is a plan view showing a part of the sewing machine cut away, FIG. 6 is a partial side view showing an operation state, and FIGS. c) is a partial front view showing the operation state of the bending device. 2 ... needle, 6 ... feed plate, 7 ... holding plate, 19 ... template,
23 …… Presser spring as holding piece, 35… Bending piece, 51…
... Microcomputers as first and second control devices, 52... Presser foot pedal, 53... Start pedals constituting the first and second input devices together with 52, W1... Work cloth, W2. , F ...
... Sending device, N ... Seam forming device, B ... Bending device,
S ... sewing piece supply device.

Claims (1)

(57) [Claims] 1. A stitch forming apparatus including a needle which is moved up and down, a feed plate arranged on a bed surface on which a work cloth can be placed, and a sewn piece supplied onto the work cloth is fed by the feed plate. A sewing machine including a presser plate moved between an operation position pressing toward the bed surface and an inoperative position separated upward from the operation position, and a feed device relatively moved with respect to the needle; A template on which a sewing piece to be supplied to the feeder is placed, a switching position between a holding position for pressing and holding the sewing piece placed on the template, and a retreat position retracted from the holding position; A sewing piece supply device that is switched between a supply position that enters between the feed plate and the holding plate, and a standby position that is laterally separated from the supply position; The sewing piece that has been placed between the plate and the holding plate
A folding device provided with a bending piece for bending so as to surround the template, wherein the sewing machine is operated by an operator, and the seam forming device, the feeding device,
An input device for inputting a signal for operating the sewing piece supply device and the folding device; and a retracting position of the holding piece of the sewing piece supply device disposed at the standby position while the input signal from the input device is continued. To place
The holding piece is switched to the holding position by interrupting the input signal from the input device, the sewing piece supply device is moved to the supply position by the subsequent input signal, and the bending device is driven by the subsequent input signal. A first control device for bending the sewn piece to move the sewn piece supply device to a standby position, and further performing a sewing operation by the stitch forming device and the feed device according to a subsequent input signal; During the sewing operation of the sewing machine by the eye forming device and the feed device, when an input signal from the input device is input, the sewing material supply device disposed at the standby position during the sewing operation while the input signal is continued. The holding piece is arranged at the retreat position, the holding piece is switched to the holding position by interrupting the input signal, and the sewing piece supply device is moved from the standby position to the supply position after the sewing operation is completed. And a second control device for moving the sewing machine.