JPS6149995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pattern selection system that includes a storage body in which stitch information corresponding to each of a plurality of different sewing patterns is stored in advance, and a pattern selection system that allows each stitch pattern in the storage body to be read out individually by manual operation. The present invention relates to a sewing machine having a switch and forming a sewing pattern based on stitch information read from a memory, and particularly to a control device for a sewing machine that can control the selection operation of a pattern selection means.

Conventionally, sewing machines designed to sew patterns as described above have been prone to malfunctions in which the selected pattern is changed due to input of external noise or inadvertent contact with the selection switch by the operator. In particular, if such a malfunction occurs during sewing, the seams of the sewn product will be disordered.
There is a known sewing machine in which it is impossible to select a pattern while the sewing machine is running.

However, in industrial sewing machines, etc., where the process from startup to thread trimming is one sewing process, and this process is sewn in a specific sewing pattern, thread trimming may occur before completion, for example, when sewing a sewn product. When the sewing machine stops operating in order to change the sewing direction at a corner, the above method allows pattern selection, which prevents input of external noise as described above or the operator accidentally turning on the pattern selection switch. The pattern may change due to contact, etc., and if the worker starts sewing again without noticing this change, the stitches will be disrupted and the stitches will have to be resewn.
This caused a drawback.

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

Hereinafter, 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 belt 6 connected to a pulley 3 fixed to a main shaft (not shown) and a drive pulley 5 of a motor 4 fixed below the table. Connect via. Motor 4 connects clutch solenoid CS and brake solenoid BS (third
This is a well-known electromagnetic clutch motor having a conventional electromagnetic clutch motor (see Fig. 1), which changes its driving speed in proportion to the amount of forward depression of a pedal 7, which is supported below the table 1 so that it can be depressed forward and back. An operation panel 8 is arranged on the front side of the machine frame of the sewing machine, and this panel has sewing pattern patterns M ₁ to M _o , light emitting diodes L ₁ to L _o that individually correspond to each pattern, and can be operated by pressing to emit light from them. Pattern selection switches S ₁ to S _o individually correspond to the diodes L ₁ to L _o , and setting switches D ₁ to _{D 4} that can be rotated to set the number of stitches in each sewing section of the sewing pattern are provided. establish.
It should be noted that the sewing patterns Ml to Mn in this embodiment are a combination of forward stitching and reverse stitching. Also,
This sewing machine has a well-known thread cutting device (not shown) as disclosed in Japanese Patent Publication No. 53-43104, etc., and the thread cutting solenoid ST (the third
It operates in conjunction with the energization shown in Figure). Furthermore, the fabric feed mechanism (not shown) includes a reverse stitch solenoid BT.
A known backstitch mechanism is provided which operates in conjunction with the biasing of the . 9 is a control box which houses an electric circuit (FIG. 3).

Next, the electric circuit of this embodiment will be explained.
In FIG. 3, MC is a microcomputer (hereinafter referred to as microcomputer) serving as a memory, reading means, and execution means, and it stores stitch information and pattern selection switches S 1 to S _o corresponding to each sewing pattern M ₁ to _{M o} . It has a function of pre-storing a pattern selection program etc. related to the data, reading data from an input port, reading pre-stored information based on these data, storing the information in a register, performing calculations and outputting it. The input port of the microcomputer MC has pattern selection switches S ₁ to S _o and setting switch D _1.
~ D ₄ is connected to the pedal 7, and the output port has a speed control circuit that can set the speed of the motor 4 by turning the clutch solenoid CS and brake solenoid BS on and off alternately according to the amount of depression of the pedal 7. VC, display circuit LDR for lighting the light emitting diodes L ₁ to L _o , reverse stitching solenoid
Energizing circuit BD for energizing/deenergizing BT, energizing circuit for energizing/deenergizing thread trimming solenoid ST
Connect SD.

Figure 4 is a flowchart of a program stored in the microcomputer MC to set the pattern selection prohibited section. The "thread trimming processing routine" is a routine that energizes the thread trimming solenoid, performs thread trimming, and then deenergizes the thread trimming solenoid. After the initial state is set, S ₁ to _{S o}
It "judges" the buy state, and when none of them is on, the information of _M1 is stored in the register, and when it is on, the information corresponding to that S is stored in the register. The information stored in the register is displayed by the light emitting diodes L ₁ to _Lo corresponding to the information. "Pedal depression" is immediately determined, and if the pedal 7 is depressed, it is determined that the "thread trimming flag is set", and if it is set, it is reset, and then the stitch information stored in the register is calculated and the speed control circuit VC is activated. and energizing circuit BD,
Output to SD. Next, it is determined whether the pedal has been pressed back, and if the pedal has been pressed back, the thread trimming flag is set, and if the pedal has not been pressed back, the thread trimming flag is immediately determined. be done. Determinations of ``pedal depression'' and ``thread trimming flag set'' constitute a discrimination circuit.
If the thread trimming flag is set, by operating any one of the pattern selection switches _S1 to _S0 , the stitch information currently stored in the register of the microcomputer MC corresponds to the operated pattern selection switch. Stitch information of the sewing pattern is stored in that register. The newly selected sewing pattern is displayed by the light emitting diodes L ₁ to _{L o} . If the thread trimming flag is not set, the pattern selection switch S ₁ to _{S o}
As a result of the operation, display is immediately performed by the light emitting diodes L ₁ to L _o without reading out (inhibition circuit).

The present invention has the above-mentioned configuration, and its operation will be explained next. When the power of the sewing machine is switched from off to on, "initial state setting" and "thread trimming flag setting" are performed. Here, when the pattern selection switch _S2 is operated, for example, stitch information corresponding to the sewing pattern _M2 is stored in the register of the microcomputer MC, and the light emitting diode _L2 is turned on. Operate setting switches _D1 to _D4 to set the number of stitches for each section divided by reverse stitching (three sections for sewing pattern _M2) , place the fabric on table 1, and then press pedal 7. When you step on the button, the thread trimming flag will be reset and the main shaft will start rotating.
Sewing is started, and the sewing machine and each solenoid are controlled based on sewing information from the microcomputer MC to form a seam (first state).

Now, in the middle of sewing, press the pattern selection switch S ₁ ~ _{S o}
No matter which one of them is operated, since the thread trimming flag is reset, no new stitch information is stored in the register of the microcomputer MC, and therefore the light emitting diode _L2 continues to emit light. When the specified sewing work is completed, depressing the pedal 7 again stops the sewing machine and turns the thread trimming solenoid on.
Since ST is energized, thread trimming is performed and a thread trimming flag is set in connection with the completion of thread trimming (second state). At this time, for example, the pattern selection switch
When S ₃ is operated, the thread trimming flag is set, so the stitch information corresponding to sewing pattern M ₃ is sent to the microcomputer in place of the stitch information corresponding to sewing pattern M ₂ .
The information is stored in the register of the MC, and the light emitting diode L ₂ turns off and the light emitting diode L ₃ turns on. When the pedal 7 is pressed in this state, the sewing pattern is displayed.
M ₃ is formed.

Note that while the stitch information stored in the register of the microcomputer MC is being calculated and output, if the pedal 7 is pressed back and the thread is trimmed, this stitch information is cleared from the register, and then the pattern selection switch S ₁ is pressed. ~S _o
Stitch information newly read out by the operation is stored in the register from the beginning.

As described above, according to the present invention, the prohibited period of pattern selection operation is from the start of the sewing machine to the completion of thread trimming. Even if a worker accidentally touches the pattern selection means or electrical noise is input from the outside when the drive is temporarily stopped, the pattern selection will not be changed, and the sewing pattern will always be the same. Since the sewing process can be completed in one step, there is no need for re-sewing, which has the effect of improving work efficiency and improving the quality of sewn products.

In the above embodiment, the thread is trimmed when the pedal is pressed back, but a separate switch for thread trimming may be provided on the front of the machine frame of the sewing machine, or The cutting mechanism may be operated directly manually, in which case the movement of the thread cutting knife may be detected and determined by a microcomputer.

Further, the electromagnetic clutch motor in the above embodiment is not limited to this, and for example, a mechanical clutch motor or a DC motor controlled by a thyristor may be used.

Further, the sewing pattern is not a one-dimensional pattern by a combination of forward stitching and reverse stitching as shown in the above embodiments, but may be a two-dimensional pattern such as a zigzag stitch by providing a predetermined needle swinging means.

[Brief explanation of the drawing]

Figure 1 is a front view of the sewing machine, Figure 2 is a diagram of the sewing machine's operation panel, Figure 3 is a block diagram of the electrical circuit,
FIG. 4 is a flowchart of the pattern selection prohibition function. In the figure, 4 is a motor, MC is a microcomputer, and S ₁
~S _o is a pattern selection switch, and 7 is a pedal.

Claims (1)

[Scope of Claims] 1. A motor 4 that is connected to the main shaft of the sewing machine and can be electrically driven or stopped; a thread trimming actuating means ST that operates the thread trimming means in response to a thread trimming signal; and a stepping operation and a stepping operation. An operating means 7 having a pedal capable of reverse operation and generating different electrical signals in relation to each operation; a memory body storing a plurality of different stitch information; and a memory body storing stitch information in the memory body in connection with manual operations. selection switches S ₁ to _{S o} capable of generating different selection signals in response to each selection signal; reading means for reading sewing information in a memory corresponding to each selection signal; and execution means for controlling the motor and thread trimming means based on the pedal depression operation, the motor is driven by the pedal depression operation, the motor is stopped in response to sewing information, and the thread trimming signal is generated by the pedal depression operation. In a commercial sewing machine, the first state is from the generation of an electric signal due to a pedal depression operation to the generation of the next thread trimming signal, and the second state is from the generation of the thread trimming signal to the generation of an electrical signal due to the next pedal depression operation. and a disabling circuit for disabling the effect of the selection signal from the selection switch in relation to the determination of the first state of the discriminating circuit, during the sewing control period based on the sewing information in the memory. A control device for a sewing machine, characterized in that changing sewing information by a selection switch is prohibited.