JPH026557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention puts the sewing machine into a driving state in conjunction with a pedal start operation, and automatically stops the sewing machine when a predetermined number of stitches have been formed based on sewing data stored in advance. The present invention relates to a control device for a sewing machine that enables automatic stop stitching in which a predetermined sewing operation is performed by repeating a sewing operation a plurality of times.

Conventionally, in the above-mentioned sewing machine, the number of stitches to be sewn is set before sewing, the number of rotations of the main shaft of the sewing machine is counted and the sewing data is read, and when the counted value becomes equal to the set value, that is, the number of stitches to be sewn is reached. The sewing machine was designed to automatically stop when a stitch was formed, but if the sewing machine was to be stopped when an abnormality such as thread breakage occurred during sewing, the sewing data (number of stitches) It was necessary to reset the count value) to the initial state (0). In other words, when making an emergency stop when these abnormalities occur, the main shaft of the sewing machine, which is running at high speed, does not stop immediately due to inertia, but rotates several times and sews without stopping, so the rotation of the main shaft due to this inertia is caused by the circuit. is counted and the sewing data advances, and if you continue to count the number of stitches from the point where thread breakage occurred when restarting the sewing machine, the counted value will become equal to the set value before reaching the expected sewing end point and the sewing machine will automatically start counting. As a result, the stitched shape cannot be sewn in a predetermined manner, leading to disadvantages such as the product being wasted or the quality of the product being significantly impaired.

Also, when sewing highly elastic fabrics,
Because seams are formed while the cloth is stretched during cloth feeding, even if the prescribed number of stitches has been completed, the number of actually formed seams will be insufficient by the amount that the cloth has been stretched, and the final seam will not be sewn. The end point was short of the scheduled end point, resulting in the same drawback as above.

The present invention aims to eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described with reference to the drawings. A sewing machine 2 placed on a table 1 has a pulley 3 fixed to a main shaft (not shown) connected to a drive pulley 5 of a motor 4 located below the table 1 via a belt 6. and connect. The motor 5 is a well-known electromagnetic clutch motor, and is driven or stopped at variable speed by electrical control. A needle position detecting means 7 arranged in relation to the main shaft detects the rotation angle of the main shaft corresponding to the upper or lower position of the needle and generates a respective position signal.
A control member 8 fixedly disposed on the upper part of the sewing machine 1 can be used to create a plurality of different sewing shapes (patterns), for example,
Display section 9 formed with a pattern corresponding to the sewing shape of B
and selection switch 1 for selecting those sewing shapes.
0 and an operation button 11 that opens and closes a changeover switch M.SW, which will be described later and can be operated by pressing.
will be established. The pedal 12 is a well-known pedal that enables a front pedal operation in which the pedal is pressed forward from the release position and a back pedal operation in which the heel is pressed. It has a well-known circuit (not shown) for generating a signal, and has a start switch L.SW (Fig. 3) at the initial position of the front depress operation and a thread trimming switch T.SW (Fig. 3) at the rear depress operation position. ) will be established.

Next, the electric circuit will be explained.

The aforementioned changeover switch M.SW is operated by operation button 11.
When the pedal 12 is pressed, the circuit is closed and a switching signal is instantaneously generated, and the start switch L.SW is closed at the initial stage of the front depression of the pedal 12 and a start signal is generated. The circuit is closed by the rear pedal operation and a thread trimming signal is generated.

The sewing shape selection circuit PS generates a signal (selection signal) for selecting one of the patterns A and B in FIG. 2 by operating the selection switch 10.

MC is a microcomputer with ROM,
FIG. 5 shows a well-known circuit consisting of a RAM and a CPU and controlled by this microcomputer to achieve the functions of the flowchart shown in FIG. 4.

In Figures 4 and 5, the MSW flag is always reset to 0 by the initial reset circuit 14 in the state setting circuit 13 when the power is turned on, and first, the M.SW is closed and the switching signal rises. When the MSW flag is 0, the first judgment unit of the state judgment circuit (discrimination circuit) 15 judges the MSW flag (A), and when the flag is 0, the drive judgment circuit 16 judges whether the sewing machine is driving or not, and the sewing machine stops. If so, the MSW flag is set to 1 and the sewing process that has been executed up to that point is stored in the memory circuit 17. When the MSW flag is 1 in judgment (A), the MSW flag is reset to 0 and the start address of the sewing process next to the sewing process when the M.SW was turned on is set in the latch circuit (setting circuit 18). The data of the process can be read out. When it is determined whether the sewing machine is running or when the above process has been stored or set, the second judgment section of the state judgment circuit 15 judges the MSW flag (B), and when the flag is 0, Automatic sewing circuit 19
When the flag is 1, the manual sewing circuit 20 is closed and the sewing machine is controlled according to the "manual sewing routine".

For example, the "automatic sewing routine" is
The sewing machine is controlled as described in the specification and drawings of No. 5633, and the sewing shape selection circuit PS selects the sewing shape from among the sewing shape data shown in Fig. 2 A and B stored in advance in the ROM. One of them is selected, the selected data is temporarily written in the RAM, the needle down position signal of the needle position detection means 7 is counted in connection with the operation of the pedal 12, and the data is sequentially read out from the RAM. That is, in sewing shape A, the motor 4 is driven in conjunction with turning on the L.SW by pressing the front pedal 12, and when the sewing machine has completed forming the preset number of stitches (a-b), the sewing machine is turned on. The motor is automatically stopped so that the sewing machine is in the lower position (sewing process), and the motor is driven so that a predetermined number of stitches between b and c are formed in conjunction with the next front depression of the pedal 12. The motor stops at the needle down position (sewing process), and in conjunction with the next front depression of the pedal 12, the motor is driven to form a predetermined number of stitches between c and d, and then the thread is cut at point d. A means (not shown) is activated and the needle is automatically stopped (sewing process) so that the needle is in the upper position.

In addition, in sewing shape B, by turning on the L.SW associated with the front depressing operation of the pedal 12, the forward feed between a and b and the reverse feed between b and c are performed to tack stitch the set number of stitches at the beginning of sewing (sewing process ), and then form a seam between c and d for the set number of stitches (sewing process). After completion, the sewing machine automatically stops at the needle down position,
Turning on T.SW by rear-depressing the pedal 12 performs reverse feed between d and e, forward feed between e and f performs tacking stitches (sewing process) at the end of sewing of the set number of stitches, and then the thread trimming means and automatically stops at the needle up position.

"Manual sewing routine" means that the motor 4 is driven only by the normal operation of the pedal 12 by the operator.
It is controlled so that it can be stopped.

This invention has the above configuration, and when the M.SW is off when the power is turned on, the "automatic sewing routine" is selected by judgment B, and if sewing shape A is selected at that time, the shape is sewn according to the automatic sewing routine. is formed.

For example, the sewing process (between a and b) of the shape A
When the M.SW is turned on by operating the operation button 11, an instantaneous switching signal is generated, and if the sewing machine is running, automatic sewing will be maintained until the sewing machine stops, but when the sewing machine is stopped, memorizes the current sewing process and then switches to the manual sewing routine.

Therefore, when the sewing machine stops due to an abnormality such as thread breakage during automatic sewing, the sewing machine may continue to form the interrupted stitch, or the fabric may be stretched and sewn to complete the formation of the set number of stitches. Sometimes, when the final number of stitches does not reach the planned stitching point of the fabric, by operating this button 11 to switch to manual sewing mode, the sewing machine can form any stitches regardless of the set number of stitches, so there is no shortage of stitches. Seams can be formed.

Next, in this manual sewing state, the operation button 11
When the M.SW is turned on by operating , the MSW flag is set to 1, so the MSW flag is set to 0 and the automatic sewing data is set to the beginning data of the next sewing process. After that, since the flag is 0, the state is switched to the automatic sewing state by the automatic sewing routine.

In this embodiment, an operation button is provided as an operation means for selecting manual sewing or automatic sewing.
Other switches may also be provided, for example an alternate switch.

Further, in this embodiment, two sewing shapes (patterns) shown in FIG. 2A and B are shown, but many other sewing shapes may be used.

As described above, according to the present invention, the operating means 11 for enabling manual operation and the discriminating means 15 for detecting the state of automatic sewing or manual sewing of the sewing machine are provided. a switching means for switching the control means to automatic sewing and manual sewing in connection with the operation in the automatic sewing state; and a storage means for storing a sewing program at that time when the switching means causes the control means to perform manual sewing. and a setting means for setting the control means to an initial state of a sewing program next to the sewing program stored in the storage means when the control means switches to manual sewing due to the switching means.
When a thread breakage occurs during automatic sewing, the sewing program for the next process can be started from the beginning by simply switching to manual sewing, completing the process scheduled to be sewn with that sewing program, and then switching to automatic sewing again. This eliminates the need for the worker to initialize the program, which simplifies the work and significantly improves work efficiency.Also, sewing can always be started from the beginning when starting the next program, eliminating the possibility of incorrect sewing. Since there is no error and the operator can reliably know the current status when restarting the program, effects such as improved product quality and reliability can be obtained.

In addition, when forming a seam on a fabric that stretches during cloth feeding, even if the motor stops after forming a predetermined number of stitches, switching to manual stitching allows the stitch to continue to be formed up to the scheduled end point, improving efficiency. Effects can also be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view of the sewing machine of this embodiment, Fig. 2 is an explanatory diagram showing the sewing shape (pattern) of this embodiment, and Fig. 3 is a front view of the sewing machine of this embodiment.
4 is a block diagram of an electric circuit, FIG. 4 is a flowchart of a "manual subroutine", and FIG. 5 is a block circuit for achieving the flowchart of FIG. 4.

Claims (1)

[Scope of Claims] 1. A motor connected to a main shaft that can be driven or stopped by electrical control, and a pedal that can be operated at a front pedal position that generates a start signal and a rear pedal position that is separated from the front pedal position and generates a stop signal. , a detection means disposed in relation to the spindle and generating a detection signal each time the spindle rotates; a counting means that counts the detection signals and generates a count signal when the value reaches a predetermined value; and activation. There are multiple manual sewing programs that drive the motor in relation to a signal and stop the motor in relation to a stop signal, and manual sewing programs that drive the motor in relation to a start signal and stop the motor in relation to a count signal. In a sewing machine equipped with a control means that enables automatic sewing that sequentially generates a sewing program and completes automatic sewing by generating a scheduled number of counting signals, an operating means 11 that enables manual operation and a control means that enables automatic sewing or manual sewing of the sewing machine. switching means for switching the control means to automatic sewing in relation to the operation in the manual sewing state and manual sewing in relation to the operation in the automatic sewing state; A storage means for storing a sewing program at that time in connection with the control means switching to manual sewing by the means, and a sewing program next to the sewing program stored in the storage means in connection with the control means switching to automatic sewing by the switching means. A control device for a sewing machine, comprising: a setting means for setting the control means to an initial state of a sewing program of the sewing machine.