JPS63793Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a thread breakage management device for an electronic multi-head sewing machine.The feature is that when a thread breakage is detected and the machine is stopped, the thread will break several stitches before the stop position. By simply counting the number of stitches that have occurred and setting the number of stitches, the machine will automatically stop at the position where the previous thread breakage occurred the next time, so you will not have to be careful about when to stop. This means that it is possible to save labor.

Conventionally, in electronic multi-head sewing machines, thread breakage is detected by changes in upper thread tension, so there is a time delay between the occurrence of thread breakage and the time it is detected and stopped. , the stitching progresses a little (usually a few stitches), and if it continues, discontinuities will occur in the stitching pattern.

Therefore, only the head where the thread breakage occurred is paused, the remaining heads are used to finish the stitching, and the next time the sewing machine is to be stitched, the sewing machine is stopped at the position where the thread breakage occurred last time, and the sewing machine is stopped due to the thread breakage. The head that had been placed was turned on again to continue the stitching so that the thread breaks would be continuous.

However, the next time the machine was to be stabbed, it had to be stopped manually while watching the progress of the stabbing.
The person operating the sewing machine had to constantly pay attention to the progress of the sewing machine and was restricted from taking his eyes off the sewing machine.

The purpose of this invention is to provide a thread breakage management device that can automatically stop at that position during the next stitch by simply setting the position where the thread breakage occurs when the sewing machine stops due to a thread breakage. It is.

An embodiment of this invention will be described with reference to the drawings.

A control circuit 2 is connected to a mechanical unit 1 of the electronic multi-head sewing machine, and drives and controls a cloth frame, a needle, a borer, etc. in accordance with signals read from a punching tape or the like.

The mechanism section 1 is provided with thread breakage detection means 3 for detecting thread breakage based on changes in needle thread tension, and its output signal is input to the control circuit 2.

A display means 4 using a CRT, liquid crystal display, etc. is connected to the control circuit 2, and is configured to appropriately switch and display set operating data, momentary operating conditions, etc.

Further, the control circuit 2 is connected to a storage means 5 and a setting means 6 for inputting operating data and the like.

Next, its operation will be explained.

When a thread breakage occurs during operation, and the thread breakage detection means 3 detects it and inputs a signal to the control circuit 2, the control circuit 2 immediately stops the operation of the mechanism section 1, and the display means 4 indicates that the thread breakage has occurred. What I did, that head No.
and the stop position are displayed, and the stop position is stored in the storage means 5.

Therefore, after counting the number of stitches from the stop position to the position where the thread breakage occurs and setting the number of stitches (for example, 3 stitches or 5 stitches) using the setting means 6, only the head where the thread breakage has occurred is stopped and other Start the head.

The control circuit 2 calculates the position at which the needle should be stopped during the next stabbing based on the signal stored in the storage means 5 and the signal set by the setting means 6, and displays the position on the display means 4 together with other driving status data. to be displayed.

When the stitching of a head other than the one at rest is completed, the cloth is replaced and stitching is started again from the beginning, and the sewing machine advances to the position where the previous thread breakage occurred, the control circuit 2 stops the stitching operation. , the operator can correctly continue the stabbing pattern simply by reactivating the head that has been inactive.

If thread breakage detection is delayed significantly and it is difficult to accurately count the number of stitches from the stop position to the thread breakage position, set the number of stitches to a slightly higher value and move forward a little after stopping to ensure accurate positioning. Just do it.

Even if thread breakage occurs in multiple heads during one stitch, the desired purpose can be achieved by repeating the same operation.

As explained above, the thread breakage management device of this electronic multi-head sewing machine detects a thread breakage and, when the machine stops, counts the number of stitches from the stop position to the position where the thread breakage occurs and sets the number. Just,
By making the next stitch automatically stop at the position where the previous thread breakage occurred, the operator no longer has to be constantly careful about the timing to stop. The sewing machine can also be monitored and labor-saving can be achieved.

[Brief explanation of the drawing]

The figure is a block diagram of one embodiment of this invention.

Claims (1)

[Scope of utility model registration request] In an electronic multi-head sewing machine which is configured to stop the stitching operation when the occurrence of thread breakage is detected, there is provided a storage means for storing the stop position and the number of stitches from the stop position to the position where the thread breakage occurs. The sewing machine is equipped with a setting means for setting the head where thread breakage occurred, and when the head where the thread breakage occurs is stopped and the stitching is continued with another head, and the next stitching is performed after the thread breakage has been completed, the head that was stopped due to the thread breakage is activated. A thread breakage management device characterized in that a sewing machine is automatically stopped at a position where a previous thread breakage occurred based on a signal from a storage means and a setting means.