JPH02168983A - Controller for sewing machine - Google Patents

Abstract

PURPOSE:To prevent a needle hole from being bored or a flaw from being attached on a pattern original figure or samply sewn object in the case of pattern input and to speedily input a pattern to a memory without fail by providing a control means to regularly rotate a motor, to cause a needle to fall down in a needle falling-down position according to a falling command, to reversely rotate the motor and to cause the needle to rise up to an upper position according to a rising command. CONSTITUTION:A reversal rotation servo motor is used as a sewing machine motor 1 to move a needle bar up and down with being linked to the main shaft of a sewing machine, for which the data input mode and sewing mode of the pattern are provided. When the shape of the pattern and needle operation are stored to the sewing machine, the sewing machine motor 1 is regularly rotated and the needle falls down to the position just above cloth. Then, it is confirmed that the position of the needle is correctly coincident with the needle position of the pattern and after position data are stored, the sewing machine motor 1 is reversely rotated. Then, the needle rises up to the upper stop position. After the needle falls down to the position just above the pattern original figure or sample sewn object, the needle can be directly rise up from this position.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a control device for a sewing machine.

[Conventional technology]

Conventionally, when a pattern (shape and needle movement) is to be stored in a sewing machine, the needle bar is moved up and down while the sewing machine continues to rotate in one direction.

[Problem to be solved by the invention]

Therefore, in such conventional sewing machines, since the sewing machine rotates more than once, a hole caused by the needle inevitably occurs in the pattern original or the sample sewn product.

The present invention is designed to eliminate these drawbacks.

[Means to solve the problem]

The sewing machine control device of the present invention includes a motor that moves a needle bar with a needle at its lower end up and down and that can rotate in forward and reverse directions, a needle position detection means that can detect the needle position, and a needle lowering position of the needle that can be set. and a control means that causes the motor to rotate forward in response to a descending command to lower the needle to the needle lowered position, and causes the motor to reversely rotate to raise the needle to the upper position in response to a rising command.

[For production]

According to the sewing machine control device of the present invention, the needle bar can be lowered directly above the pattern original or the sample sewing material and then raised directly from this position.

〔Example〕

The present invention will be explained in detail below with reference to the drawings.

In the present invention, as shown in FIG. 1, a forward and reverse servo motor is used as a sewing machine motor 1 that is connected to the main shaft of a sewing machine that has a pattern data input mode and a sewing mode to move the needle bar up and down. To memorize the needle movement (needle movement) in the sewing machine, rotate the sewing machine motor l in the normal direction to lower the needle to a position directly above the fabric, make sure that the needle position correctly matches the needle position of the pattern, and then set the needle position. After memorizing the data, the sewing machine motor 1 is reversed from that position so that it can rise to the upper stop position.

In addition, 2 is an X-Y motor for moving the cloth, 3 is a mode selection switch, 4 is a needle lowering position setting switch, 5 is a data memory input switch, 6 is a pedal switch, 7 is a needle position detector, and 8 is a JOG switch. , 9 is sewing data memory RAM,
10 is a ROM, and 11 is a CPU.

Since the control device of the sewing machine of the present invention is as described above, when storing a pattern in the sewing machine, for example, as shown in FIG. Check whether the rod position is at the upper stop position, and if it is at the upper stop position, press the JOG switch 8 to drive the cloth moving X-Y motor 2, control the X-Y position of the sewing machine, and move the needle bar. is the position estimated to be above the first needle position of the original pattern drawing or sample sewn product, and then press the pedal switch 6 to rotate the sewing machine motor 1 forward and lower the needle bar to set the position of the first needle of the original pattern drawing or sample sewn product. Stop at the needle lowering position directly above (the predetermined height set by the needle lowering position setting switch 4),
At this point, it is visually confirmed whether the needle bar position correctly matches the first needle position. If the needle bar does not match the first position correctly, press the pedal switch 6 immediately; if it does, press the pattern data memory input switch 5 to memorize this first needle position in the memory, and then press the pedal switch 6. Press to reverse the sewing machine motor 1 and raise the needle bar to the upper stop position at a predetermined height.

If they do not match, repeat the same operation for the first needle position of the pattern original or sample sewn product, and if they match, repeat the same operation for the second needle position of the pattern original or sample sewn product. conduct.

The needle lowering position of the needle bar above the surface is set arbitrarily in advance according to the thickness and unevenness of the pattern original drawing or sample sewing material, and if necessary, it is confirmed that the needle bar is in the upper stop position. If not, the JOG switch 8 and the pedal switch 6 for driving the needle down can be set not to be operated.

〔Effect of the invention〕

According to the sewing machine control device of the present invention, after confirming the needle position of the needle bar with respect to the original pattern drawing or sample sewing material, the needle bar can be raised without continuously lowering from that position. There is a great advantage in that the pattern can be quickly and reliably input into the memory without making holes or scratches.

[Brief explanation of the drawing]

FIG. 1 is an explanatory block diagram of a control device for a sewing machine according to the present invention, and FIG. 2 is a flow chart showing its operation. ]... Sewing machine motor, 2... X/Y motor for moving cloth, 3... Mode changeover switch, 4... Needle lowering position setting switch, 5... Data memory manual switch, 6
... Pedal switch, 7... Needle position detector, 8...
・JOG switch, 9...Sewing data memory RAM,
10...ROM, Engineering 1...CPU. Ahonmendan

Claims (1)

[Claims] A motor that can move the needle bar with a needle at the lower end up and down and in forward and reverse directions, a needle position detection means that can detect the needle position, a setting means that can set the needle lowering position of the needle, and a lowering command. 1. A control device for a sewing machine, comprising control means for rotating a motor in the normal direction to lower the needle to a needle lowered position, and in response to a raise command, rotating the motor in reverse to raise the needle to an upper position.