JP2890959B2 - Control device for automatic bead sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic bead stitch sewing machine which corrects the amount of movement of a feeder for transferring a sewing product in the backward stitching operation of an N-back tack in accordance with a set correction value. Things.

[0002]

2. Description of the Related Art Conventionally, an operation of a feeder for transferring a sewing product in an N-back tack sewn operation in which an N-shape is sewn is represented by P1, P2, P1, P1 and P2 as shown by dotted lines in FIG.
The sewing product was transferred to the sewing position N in the order of 4, P3, and P4. Here, the forward path of the back stitch of the N back tack indicates the movement from P1 to P2 and from P4 to P3, and the return path is P2.
From P1 to P1 and from P3 to P4. The amount of movement of these forward and backward feeders follows the value set in advance as the length of the lock stitch.

[0003]

However, in the conventional automatic bead sewing machine, the amount of movement of the fabric in the forward and backward passes of the N-back tack sewing varies depending on the type of the fabric to be sewn. For this reason, the sewing start of the forward pass and the sewing end of the return pass do not match. This results in insufficient strength of the fastening seam and unsatisfactory finishing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. By setting a correction value for correcting the amount of movement of the feeder, the present invention provides a feeder for the N-back tack stitching backward feed. It is an object of the present invention to make it possible to correct the movement amount so that the forward and backward sewing ends coincide with each other in the back stitch of the N-back tack, thereby increasing the strength of the back stitch.

[0005]

To achieve this object, an automatic bead sewing machine according to the present invention comprises a correction value setting means for setting a correction value serving as a reference for correcting a moving amount of a feeder; Control means for controlling the amount of movement of the feeder based on the correction value set by the correction value setting means.

[0006]

With the automatic bead sewing machine of the present invention having the above-described configuration, when a correction value is set in advance and sewing is performed, the movement of the feeder according to the correction value is performed at the end of the sewing in the backward stitching of the N-back tack. Correct the amount.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the CPU 2 has a correction value setting device 1 connected to an input side, a feed device 3 and a sewing device 4 connected to an output side. The correction value setting device 1 is for setting a correction value serving as a reference for correcting the amount of movement of a feed device for transferring a sewing product in the backward stitching operation of the N back tack.

The correction value setting device 1 constitutes a correction value setting means, and the CPU 2 constitutes a feed control means for controlling a moving amount of the feeding device 3 according to the correction value.

Next, the transfer of the sewing product will be described with reference to FIGS.

In step S1 of FIG. 3 (hereinafter abbreviated as S1; other steps are also the same), the CPU 2 outputs a command to transfer the sewn material to a sewing start position Q1 set in advance to the feed device 3, and in S2. It is determined whether or not the sewing start position Q1 has reached the sewing position N.
Continue to 3, and if not, repeat S2.

In S3, a command to start sewing of N-back tack is output to the sewing device 4, and in S4, a command to transfer the sewn material to the forward end position Q2 of the back sewing of N-back tack is output to the feed device 3, and in S5. It is determined whether the forward end position Q2 of the back sewing of the N back tack has reached the sewing position N, and if it has reached, the process continues to S6.
repeat.

In S6, the correction value setting means 1 sends the correction value 11
Is read, and in S7, the sewing end position Q5 of the backward movement of the back stitch of the N back tack is calculated based on the correction value l1,
In S8, a command to transfer the sewn product to the return end position Q5 of the back stitch of the N back tack is output to the feed device 3.

Subsequently, in S9, it is determined whether or not the return end position Q5 of the back stitch of the N back tack has reached the sewing position N. If it has reached, the process proceeds to S10, and if not, S9 is repeated.

In S10, a lock stitch start command is output to the sewing device 4, a command to transfer the sewing material to the lock stitch end position Q4 is output to the feed device 3 in S11, and the lock stitch end position Q4 is set to the sewing position in S12. It is determined whether or not N has been reached, and if so, the process continues to S13, and if not, S12 is repeated.

In S13, a command to start sewing of the back stitch of N back tack is output to the sewing device 4, and in S14, a command to transfer the sewing product to the forward end position Q3 of the back stitch of N back tack is output to the feed device 3. Then, in S15, it is determined whether or not the forward end position Q3 of the back sewing of the N back tack has reached the sewing position N. If it has reached, the process proceeds to S16, and if not, S15 is repeated.

At S16, the correction value setting means 1 sends the correction value l
2 is read, and in S17, the return sewing end position Q6 of the back stitch of the N back tack is calculated based on the correction value 12, and in S18, a command to transfer the sewing product to the return end position Q6 of the back stitch of the N back tack is issued. Output to the feeding device 3.

Subsequently, in S19, it is determined whether or not the return end position Q6 of the back sewing of the N-back tack has reached the sewing position N. If it has reached, the process proceeds to S20, and if not, S19 is repeated.

In S20, a sewing end command is output to the sewing device 4 to end the sewing.

[0020]

As is apparent from the above description, the control device of the automatic bead sewing machine according to the present invention can correct the moving amount of the feeder for transferring the sewing material in the backward path of the N-back tack sewing. As a result, the sewing deviation due to the cloth can be corrected, and by matching the sewing ends of the N-back tack fastening sewing, the strength of the fastening sewing is increased and the sewing finish is also beautiful.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit.

FIG. 2 is an explanatory diagram of a sewing operation.

FIG. 3 is a flowchart of a sewing operation.

[Explanation of symbols]

 1 correction value setting switch 2 CPU (feed control means)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D05B 1/00-83/00

Claims (1)

(57) [Claims] 1. A correction value serving as a reference for correcting a moving amount of a feeder for transferring a sewing product in a backward stitching operation of an N-back tack in an automatic ball stitch sewing machine having an N-back tack fixing operation. And a feed control means for controlling a moving amount of the feed device in accordance with the correction value set by the correction value setting means.