JPH10127971A - Sewing machine capable of reverse stitching - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability and to eliminate mental anxiety by performing control so as to start reverse stitching by lowering a speed to a prescribed reverse stitching lowest speed when a reverse stitching command is present, gradually accelerate a stitching speed from the lowest speed and perform the reverse stitching at a prescribed reverse stitching speed. SOLUTION: When stitching is started by a start/stop command switch 2, the speed is gradually accelerated by a slow start function and forward stitching is executed at the speed set by a forward stitching speed setting switch 3 by the program of a forward stitching speed control program storage device 12. When a reverse stitching command switch 4 is pressed, a cloth feeding direction is reversed and the stitching speed is lowered to the lowest speed set by a lowest speed setting switch 6. Then, acceleration is gradually performed by the program of a reverse stitching speed control program storage device 13, and when the speed set by a reverse stitching speed setting switch 5 is reached, the reverse stitching is executed by the program of the reverse stitching speed control program storage device 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine driven by a motor capable of reverse stitching.

[0002]

2. Description of the Related Art In a sewing machine capable of reverse sewing, when a user performs an operation using a reverse sewing button or the like, the feed is automatically reversed and reverse sewing is performed. This reverse sewing is usually set to be slightly lower than the forward sewing, that is, the ordinary sewing speed, so that the sewing direction is reversed and the sewing speed is slightly reduced.

[0003]

In the case of using the reverse stitching function as described above, when changing from the forward stitching to the reverse stitching, the sewing speed is slightly reduced, but the sewing direction is rapidly changed. There was a problem of giving psychological anxiety. An object of the present invention is to remedy the above-mentioned disadvantages of the prior art.

[0004]

In order to achieve the above object, a reverse-sewing sewing machine according to the present invention responds to a reverse-sewing command in a sewing machine capable of reverse sewing and capable of switching between reverse and normal sewing. Means for performing reverse feed stitching, and means for performing the reverse feed stitching,
Means for controlling to reverse the speed to a predetermined minimum reverse sewing speed when a reverse sewing command is issued, to start reverse sewing, to gradually increase the sewing speed from the minimum speed, and to perform reverse sewing at a predetermined reverse sewing speed. , Is characterized by having. In the above configuration, when a reverse stitch command is issued, the sewing speed is reduced to a predetermined minimum speed, and the reverse speed is gradually increased from the minimum speed to reach the reverse sewing speed. There is no anxiety.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a central processing unit 1
Is mainly composed of a microcomputer, drives a sewing machine motor 51 via a sewing control device 50, and causes a sewing mechanism 52 to execute predetermined sewing. The sewing mechanism 52 is provided with a forward / reverse switching mechanism 53 for switching the cloth feeding mechanism between forward and reverse, and performing forward sewing and reverse sewing. The switching of the forward / reverse switching mechanism 53 is performed via the sewing control device 50.

A start / stop command switch 2 is connected to the central processing unit 1. By operating the start / stop command switch 2, the sewing machine motor 51 is driven or stopped to start and stop sewing. It is supposed to do. The sewing speed is set by the forward sewing speed setting switch 3.

The central processing unit 1 is further provided with a reverse stitching instruction switch 4. By pressing the reverse stitching instruction switch 4, the central processing unit 1 controls the forward / reverse switching mechanism 53 via the sewing control device 50. Then, the cloth feed is reversed, and the speed of the sewing machine motor 51 is controlled. At the time of reverse sewing, reverse sewing is started at the minimum speed set by the minimum speed setting switch 6. This speed control is performed by controlling the sewing machine motor 51 via the sewing control device 50 in accordance with a program stored in the minimum speed control program storage device 10. From this minimum speed, the sewing speed is further accelerated by the program stored in the acceleration control program storage device 11, and the reverse sewing is executed at the reverse sewing speed set by the reverse sewing speed setting switch 5 by the program of the reverse sewing speed control program storage device 13. It has become so.

FIG. 3 is a graph showing this operation, in which the direction of cloth feed is indicated by arrows. When the sewing is started by the start / stop command switch 2, the sewing speed is gradually increased by the slow start function (), and the speed set by the forward sewing speed setting switch 3 by the program of the forward sewing speed control program storage device 12. The forward stitch is executed by (). When reverse stitching command switch 4 is pressed,
As the cloth feeding direction is reversed, the sewing speed drops to the minimum speed set by the minimum speed setting switch 6. This is executed by a program in the minimum speed control program storage device 10. Then, the speed is gradually accelerated by the program in the reverse sewing speed control program storage device 13 (), and when the speed reaches the speed set by the reverse sewing speed setting switch 5, the reverse sewing speed setting switch 5 is set by the program in the reverse sewing speed control program storage device 13. The reverse stitch is executed at the set speed (). When the reverse stitch command switch 4 is further operated after performing reverse stitching, reverse stitching is completed.

A mode in which the reverse stitching is performed at the set reverse stitching speed without leaving an acceleration period at the time of the reverse stitching in the same manner as in the prior art, and the mode of the present invention and the conventional mode described above are switched by the user's selection. It is also possible.

The operation will be described with reference to FIG. Here, a description will be given of a configuration in which the reverse stitching is performed when the reverse stitching instruction switch 4 is pressed once, and the forward stitching is restored again when the reverse stitching instruction switch 4 is pressed again. When the start / stop command switch 2 is pressed,
(Step S1), the counter N is set to 1 (Step S1).
2) It is determined whether the reverse stitching command switch 4 is pressed, that is, whether or not forward stitching is performed (step S3). If it is not forward stitching, N is counted up (step S4), and the routine jumps to step S13. Step S3
In the case of the forward stitching, the sewing is counted up similarly (step S5), and the sewing speed is accelerated by the program of the acceleration control program storage device 11 to the speed set by the forward stitching speed setting switch 3 (step S6). The operation is continued at the set speed (step S7). The central processing unit 1 always checks the operation of the start / stop command switch 2 and the reverse stitch command switch 4 (steps S8 and S9). If the start / stop command switch 2 is operated, the sewing operation ends. (Step S10). When the reverse sewing command switch 4 is operated, the speed of the sewing machine motor 51 is reduced to the minimum speed set by the minimum speed setting switch 6 (step S11), and it is determined whether or not the counter N = 2 (step S12). , N = 2, it is determined that reverse sewing is performed. Then, the sewing speed is accelerated by the program in the acceleration control program storage device 11 (step S13),
The reverse sewing operation is performed at the reverse sewing speed set by the reverse sewing speed setting switch 5 (step S14). Then, 1 is subtracted from the counter N (step S15), and the process returns to step S8. In Step S12, when the reverse push command switch 4 is pressed for the second time, that is, when N = 1, the reverse feed stitching is completed (Step S16).

[0011]

As described above, in the reverse sewing machine according to the present invention, the speed is gradually increased from a predetermined minimum speed when switching from forward sewing to reverse sewing. There are effects that the speed and direction do not suddenly change, that the work is easy, and that no psychological anxiety is given to the worker.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 3 is a speed graph showing the operation of the embodiment of the present invention.

[Explanation of symbols]

1: Central processing unit 2: Start / stop command switch
3: forward stitching speed setting switch, 4: reverse stitching command switch, 5: reverse stitching speed setting switch, 6: minimum speed setting switch, 10: minimum speed control program storage device,
11: acceleration control program storage device, 12: forward sewing speed control program storage device, 13: reverse sewing speed control program storage device, 50: sewing control device, 51: sewing machine motor, 52: sewing mechanism, 53: forward / reverse switching mechanism.

Claims (1)

[Claims] In a sewing machine capable of reverse sewing and capable of switching between reverse sewing and normal sewing, a means for performing reverse sewing in response to a reverse sewing command, and a means for performing reverse sewing include a reverse sewing command. Means for reducing the speed to a predetermined reverse stitching minimum speed to start reverse stitching, gradually increasing the sewing speed from the minimum speed, and controlling the reverse stitching at a predetermined reverse stitching speed. A sewing machine that is capable of reverse stitching.