JPH0479988A - Cloth feeder - Google Patents

Abstract

PURPOSE:To enable not only uniform ratio edging contraction to be carried out over the whole sewing part, but also edging contraction ratio to be varied locally by transferring upper and lower cloths beneath a needle while clamping the cloths in such a way that preset mating position indices on the cloths correspond to each other sequentially. CONSTITUTION:A cloth clamping handle 61 is located in its initial position nearest to a sewing machine needle 4 by cloth end detecting sensors 331, 332 and when the terminal ends of the cloth (a), (b) are detected, the cloth clamping handle 61 is opened to sew the cloth to the terminal end and stop feed belts 51, 52 after the completion of the sewing. Also in step 14, when the terminal ends are not detected, the cloth clamping handle 61 is opened to stop the sewing and feed. Thus, edging contraction without any deviation can be carried out by mating the identification marks of V notches 81, 82 with each other while retrieving sequentially the V notches 81, 82 cut in both cloths (a), (b).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a technology for supplying fabric to a sewing machine, and in particular to a fabric supply technique for a sewing machine that automatically performs "shirring stitches" in which the upper and lower supply amounts are different. It is related to the device.

[Conventional technology]

In the sewing process using a sewing machine, so-called "shirring stitches" are sometimes performed that change the amount of feed of the upper and lower fabrics to create fullness in the garment, but this is difficult to automate due to the expansion and contraction of the upper and lower fabrics. Generally, this process relied on manual labor.

Conventionally, there has been a fabric supply device for automatic shirring sewing as shown in FIG. 8, in which a tension applying mechanism 101 tensions and biases the rear ends of upper and lower fabrics a and b fed under the needle of a sewing machine 100 with a constant tension. It has a structure in which shirring stitches are performed by feeding the fabrics a and b while holding them by a pinching member 102 connected to the needle. The sewing position is controlled by a seam allowance control manipulator 104 that slides into orthogonal contact with each other.

[Problem to be solved by the invention]

However, in the above-mentioned automatic shirring sewing fabric supply device, -
It is possible to perform shirring stitches evenly over the entire length of the seam, and - when performing shirring stitches in a part of the seam, the amount of shirring may vary depending on the part of the seam. Since there is no mechanism for automatically changing the gripping device of the pinching member 102, sewing in this case has to be done manually.The present invention has been made in view of the above problems.

In addition to performing shirring stitches over the entire seam,
It is an object of the present invention to provide a fabric supply device for automatic shirring stitching in a sewing machine, which can freely change the amount of shirring in a part of a seam part or partially in a seam part. It is something.

[Means to solve the problem]

The fabric feeding device according to the present invention includes a feeding device that feeds two pieces of fabric to be sewn toward a seam forming device, and a feeding direction alignment position mark carried by the feeding device and provided in advance on both fabrics. A fabric handling means for searching and aligning the feeding direction with the side edges of the fabric, and firmly grasping the two pieces of fabric with both fabrics together, and transporting the fabric under the needle in synchronization with the feeding means. The main feature is to grasp the fabric in a state where the side edges of both fabrics are aligned and match the feed direction alignment position marks, and to feed the fabric under the needle.

Further, the dough manipulation means rotates a spherical dough moving member rotatably supported in a feeding direction and a direction orthogonal to the feed direction with respect to a pair of dough manipulation modules facing each other above and below the separation plate by a dough edge control motor. It is composed of a seam allowance control gripping means for controlling, and a joining position detection gripping means for gripping after detecting the joining position of the upper and lower fabrics.

[Effect]

In the above configuration, when performing shirring stitching in automatic sewing of the sewing machine, the feeding means transfers the upper and lower fabrics to be sewn under the needle while gripping the upper and lower fabrics to be sewn together so as to sequentially correspond to preset alignment position indications.

In other words, when the fabric operating means searches for the feeding direction matching position marks given in advance on both fabrics and matches the feeding direction with the side edges of the fabric, the two fabrics are firmly gripped with both fabrics aligned. At the same time, the material transfer means transfers both materials below the needle in synchronization with the feeding means. By performing shirring stitches by repeating this process, you can not only perform shirring stitches with a uniform ratio over the entire seam area, but also - shirring stitches in a part of the seam area, or - shirring stitches in a part of the seam area. The shirring ratio can be freely changed partially within the shirring ratio.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dough supplying device according to the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show three side views of the fabric supply device (excluding sewing machine fI#4), and the fabric supply device is connected to the sewing machine 1 as a seam forming means as shown in FIG. a seam allowance control gripping means 3 configured in the pocket of the head, which controls movement along a guide rail 2 installed parallel to the fabric supply direction, detects the edge of the fabric, and controls the seam allowance; Perform positioning in the fabric feeding direction (shirring position control), grip the upper and lower fabrics a and b, and press the sewing machine needle 4.
The alignment position detecting and gripping means 6 that feeds the material under the needle as it moves up and down, the material transfer means 5 that transports the stacked material under the needle at a predetermined speed, and the microcomputer 7 that drives and controls these parts (see Fig. 5 "Control"). (see “System Block Diagram”).

The seam allowance control gripping means 3 includes a base member 30 slidably extending over the guide rail 2 and a belt presser 21 attached to a part of the endless drive belt 21 which is installed parallel to the guide rail 2.
a is fixed, and the position of the endless drive belt 21 is controlled by a displacement control means that rotationally drives the endless drive belt 21 by a displacement drive control motor 22. In addition, guide rail 2. Endless drive belt 21. The belt presser foot 21a, the displacement drive control motor 22, etc. form a feeding means, and the seam allowance control gripping means 3 and position detection gripping means 6 together form a fabric manipulation means.

Bearing bracket 301.30 protruding from the base member 30
1, an upper operation module 31 and a lower operation module 32 are vertically opposed to each other with separation plates 33 fixedly protruding horizontally from the bearing brackets 301 and 301 interposed therebetween, and are connected through pin shafts 302 and 302. It is pivoted so that it can rotate vertically.

Both operating modules 31 and 32 are connected via links 304 and 304, respectively, to the links 304 and 304 of an opening and closing cylinder 303 fixed to the base member 30, and are opened and closed across the separation plate 33 by the reciprocating operation (arrow A) of the opening and closing cylinder 303. The structure is as follows. A pair of spherical dough moving members 311, 311, 321, 321 are rotatably provided on the opposing surfaces of the separation plate 33 of both dough manipulation module members 31, 32, respectively, and dough edge control motors 312, 321, 321, 322, it is independently controlled to rotate in the direction of arrow X and freely roll in the direction of arrow Y. and each spherical dough moving member 3
11, 311, 321, 321 are lock cylinders 313 fixed to both fabric operation module members 31 and 32, respectively.
, 323, the structure is fixed (pressing the fabric) or rotationally controlled.

Approximately at the center of the separation plate 33, fabric edge inspection sensors 331 and 332 are independently provided on the upper and lower sides, respectively, and the fabric edge information detected by the sensors is sent to the microcomputer 7 as seam allowance information j. It is output to the central control unit CPU.

The alignment position detecting and gripping means 6 includes a cloth gripping hand 61 which is pivotally mounted on a bracket 305 protruding from one side of a bearing bracket 301 of the base member 3o so as to be perpendicular to the cloth feeding direction.
62 are placed opposite to each other on both sides of a fixing plate 63 having a reflective surface fixedly protruding from the bracket 305, and both fabric gripping hands 61.6
2 and upper alignment position detection sensor 611. A lower alignment position detection sensor 621 is configured, and an upper alignment position detection sensor 611 is structured to also serve as a cloth end sensor. Also, only the dough gripping hand 61 is attached to the bracket 30.
The hand opening/closing cylinder 64 fixed to the hand opening/closing cylinder 5 is driven to open and close, and the upper cloth a and the lower cloth A are sandwiched between the hand opening and closing cylinder 64 and a fixed plate 63, respectively.

The fabric transfer means 5 has a structure in which two pairs of upper feed belts 51.51 and lower feed belts 52.52 are disposed on both sides of the sewing machine needle 4 and installed in parallel and opposite to each other above and below the fabric supply level.

One feed pulley 53 for constructing the double feed belts 51 and 52
and lower feed repulley 54 are supported by parallel links 55, 55, respectively, and link opening/closing air cylinders 56.
56, the two feed belts 51, 52 move toward the fabric supply level (arrow C) L to widen and narrow.

Further, the one feed pulley 53 and the lower feed pulley 54 are rotatably connected to a pulley attached to the drive shaft of the feed control motor 58 via a circulating endless belt 57, and the two feed belts 51 .52 is rotated in the cloth feeding direction indicated by the arrow.

FIG. 5 is a block diagram showing an example of the configuration of the control system of the dough supplying device configured as described above, in which the microcomputer 7
Both fabric edge detection sensors 3 are installed in the central control unit CPU installed in the
31, 332 and both alignment position detection sensors 611, 62
1, and each manipulator is controlled and driven via drive circuits 71, 71, . . . and electromagnetic valves 72 as necessary, according to processing programs written in RAM and ROM.

Note that the positioning of the upper and lower fabrics a and b is performed in advance by aligning the V-notches 81 and 82 carved in the seam allowance of the fabric according to the shirring amount J and using position detection sensors 611 and 62, as shown in FIG.
1 or by imprinting with invisible paint.

Next, the automatic shirring control operation of the fabric supply device by the above control system will be explained. (See Figure 7 "Flowchart") The dough supplying device configured as described above has two sheets of dough a.

When stitching b, first, the fabric gripping hand 61 and the fabric manipulation modules 31 and 32 are brought closest to the sewing machine needle 4 side and opened, and the feed belts 51 and 52 are opened (step 1).

Next, insert the upper and lower fabrics a and b between the feed belts 51.52 at the needle drop point and between the fabric gripping hand 61.62 and the fabric operation module 31.32, and check whether the fabrics a and b are set. It is detected by the fabric edge detection sensors 331 and 332 (step 2).

When the fabrics a and b are set, the feed belts 51 and 52
After closing the fabric manipulation modules 31 and 32 and gripping the fabrics a and b (step 3), the fabric edge control motor 312,
322 is activated, and the fabric edge detection sensors 331 and 332 start fabric edge control (step 4) while detecting the fabric edge.

Based on the seam allowance information from both fabric edge detection sensors 331 and 332,
Both operation modules 31 and 32 align the side edges of the fabrics to be sewn a and b, and move both fabric gripping hands 61 and 62 in the direction away from the position closest to the sewing machine needle 4 (the fabric gripping hand 61 is in an open state). ) Traveling with ■Notsuchi 81
, 82 (alignment mark) (step 5).

The V notches 81, 82 are provided in advance on the fabrics a and b to be sewn, and the upper side alignment position detection sensor 611 or the lower side alignment position detection sensor 621 detects the V notches 81, 82,
Alternatively, search for the end of the fabric (step 6).

When one of the V notches 81 or 82 is detected, the detection side sensor and the spherical fabric moving member 311, 311 or 321, 321 are gripped and fixed by the lock cylinder 313 or 323. Then, while stretching one fabric, the other V-notch is searched and moved (step 7).

To explain in detail the steps 5 to 7 above, in the process leading to this notch search and dough gripping operation,
The spherical fabric moving members 311 and 321 are independently driven by fabric edge control motors 312 and 322 in response to seam allowance information from fabric edge detection sensors 331 and 332, and continue to operate so that the fabric edges are always aligned. At the same time, when the lock cylinders 313 and 323 operate, the dough edge control motors 312 and 322 stop operating.

Next, for the upper fabric a and the lower fabric, the other V-notch 81
or 82 is detected (step 8), both the notches 81 and 82 are detected, and both operating modules 31.3
When the upper and lower V notches 81 and 82 match according to step 2 (step 9), it is determined whether the upper and lower alignment marks match (step 10), and if they match, the two pieces of fabric a and b are combined to separate both fabrics. Grip it more firmly with the gripping hands 61 and 62 (closing the dough gripping hand 61) (step 11)
do.

In this state, the upper and lower feed belts 51, 52, the fabric gripping hands 61, 62, and the fabric operation modules 31, 32 synchronize and feed the fabrics a and b in the sewing machine needle 4 direction, and the sewing machine needle 4 and hook (not shown) Two pieces of fabric a and b are sewn together (step 12).

Therefore, the operation modules 31, 32 and the fabric gripping hands 61, 2 are moved back and forth along the guide rail 2 in the direction of the arrow by the displacement drive control motor 22 via the endless drive belt 21 when detecting the notches 81, 82 and during sewing. Becomes driven.

Next, by the fabric edge detection sensors 331 and 332.

When it is detected that the material gripping hand 61 is located at the initial position closest to the sewing machine needle 4 and that the materials a and b are at the end (step 13.14), the material gripping hand 61 is opened (step 15). and sew until the end of the fabric (step 16).
), and when the sewing is finished, the feed belts 51 and 52 are stopped (
Step 17). Further, if the fabric is not at the end in step 14, the fabric gripping hand 61 is opened to stop sewing and feeding (step 18), and then the process moves to step 5.

By repeating the above sequence, both fabrics a and b
By sequentially retrieving the ■ notches 81 and 82 attached to the sewing machine, shirring stitching is performed by matching the alignment marks using the ■ notches 81 and 82, and sewing without misalignment is performed.

〔Effect of the invention〕

As described above, the fabric feeding device according to the present invention, when performing shirring stitching in automatic sewing of a sewing machine, feeds the fabric under the needle while gripping the upper and lower fabrics to be sewn so as to sequentially match preset alignment position indications to the upper and lower fabrics to be sewn. Since the configuration is such that sewing is carried out by the method of transportation, it is not only necessary to perform uniformly shirring stitches over the entire seam area, but also to perform shirring stitches on a part of the seam area, or - to sew. The shirring ratio can be freely changed partially within the section. As a result, sewing errors do not occur, and sewing can be performed automatically and with high precision without any sagging. Furthermore, by configuring the fabric sliding member of the operation module as a spherical fabric moving member, it can passively roll freely in the feed direction perpendicular to the control direction, reducing the amount of friction against the fabric and eliminating damage to the fabric. It has the characteristics that it is possible to do the following, and the effects after implementation of the present invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the fabric feeding device according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a right side view of the same, and Fig. 4 is a sewing machine according to the present invention excluding the Jun-Chishu. FIG. 5 is a block diagram showing an example of the configuration of the control system of the fabric supply device; FIG. 6 is a perspective view showing an example of the fabric alignment position display; FIG. 7 (a) ), (b) are flowcharts showing the automatic shirring stitching control operation of the fabric supply device,
FIG. 8 is a schematic perspective view of the main parts of a conventional dough supply device. DESCRIPTION OF SYMBOLS 1...Sewing machine head 2...Guide rail 22...Displacement drive control motor 3...Seam allowance control gripping means 30...Base member 3
03... Opening/closing cylinder 31.32... Upper and lower operation modules 311.3
21... Spherical fabric moving member 312.322... Fabric edge control motor 313.323... Lock cylinder 33... Separation plate 331.332... Fabric edge detection sensor 4... Sewing machine needle 5. ... Fabric transfer means 51.52...
・Upper and lower feed belts 56...Link opening/closing air cylinders 58...Feed control motor 6...Alignment position detection gripping means 61.62...Dough gripping hands 611.621...Upper and lower sides Alignment position detection sensor 63...Fixing plate 64...Hand opening/closing cylinder 7...Microcomputer 81.82...■Notch

Claims (2)

[Claims] (1) A feeding device that feeds two pieces of fabric to be sewn toward a seam forming device, and a feeding device that searches for feeding direction alignment position marks carried by the feeding device and given in advance to both fabrics, and a cloth handling means for aligning the side edges of the cloth with the cloth, and a cloth transfer means for firmly gripping the two pieces of cloth in a state where both cloths are brought together and transporting the cloth under the needle in synchronization with the feeding means. The fabric feeding device is characterized in that the fabric is gripped with the side edges of both fabrics aligned and the feeding direction alignment position marks are searched and matched, and the fabric is fed under the needle. (2) The dough manipulation means rotates a spherical dough moving member rotatably supported in the feeding direction and a direction perpendicular thereto with respect to a pair of dough manipulation modules facing each other above and below the separation plate, by a dough edge control motor. 2. The fabric feeding device according to claim 1, comprising: a seam allowance control gripping device that performs dynamic control; and a matching position detection and gripping device that grips the upper and lower fabrics after detecting their joining positions.