JPH0154069B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to control of a return stop position when thread breakage occurs during operation in an automatic embroidery machine that performs embroidery according to a preset program.

Thread breakage in automatic embroidery machines depends on the type of thread, for example, some embroidery threads may snap sharply, while others may tear in pieces.
There are various aspects. Also, depending on the pattern to be embroidered, the conditions required at the seams of thread breaks, for example, in the case of certain embroidery patterns, overlapping embroidery must be avoided, and in the case of other embroidery patterns, there may be gaps at the seams. There are different conditions, such as the need for overlapping embroidery to avoid embroidery.

In conventional automatic embroidery machines, when a thread breaks, it stops instantly, or even if it has an automatic back function, the amount of automatic back movement (number of automatic back stitches) unique to that model is set fixedly. It had been. Therefore, there were drawbacks such as poor joints and fraying.

The present invention aims to eliminate the drawbacks of the prior art described above.

The present invention is characterized in that the optimum number of backstitches can be freely set with a simple operation depending on the type of embroidery thread, the contents of the pattern, and machine variations.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an automatic embroidery machine according to the present invention.

In FIG. 1, a data storage unit 1 is a part that stores programs, data, etc. for automatic embroidery.
It is coupled to the central processing section 2. The above program is executed by the central processing unit 2, and in the course of its execution, necessary control command signals are sent to the needle drive unit, frame moving unit, etc. to control frame movement, needle drive, etc.

Detection of thread breakage is performed by thread breakage detection section 3, and processing after detection is controlled by central processing section 2. When a thread breakage is detected by the thread breakage detection section 3, the central processing section 2 calculates the frame movement amount, movement direction, etc. for automatic backing, and sets the automatic back movement amount set counter after thread breakage is detected. 4, the X-axis and Y-axis instructions to the axis command register 5, and the direction of movement to the direction register 6.

As mentioned above, the optimal amount of the restart position, that is, the amount of movement of the automatic bag, varies depending on the type of embroidery thread, the contents of the pattern, and machine variations. In the present invention, an automatic back stitch number setting section 7 is provided so that the amount of movement of the automatic back stitch can be set to an optimal value depending on the type of yarn, the contents of the pattern, and machine variations. The automatic back stitch number setting unit 7 can be configured as a key switch or a digital switch, and is configured so that the automatic back stitch number m can be manually operated before the start of embroidery. For example, when embroidering with silk thread, the thread is very thin, so if you perform automatic back stitching after the thread breaks and repeat the stitching, the thread in that area will often break, so the embroidery in that case will be set to automatic back stitching. Let the number be 0. In addition, if the thread is very prone to hang-ups, a large number of stitches should be set because the embroidery will often be continued until the thread breaks. In normal cases, it can be set to about 3 stitches as a standard. The number m set here is the central processing unit 2.
The information is stored in a register or in the data storage unit 1, and is used by the central processing unit 2 to calculate the amount of automatic back movement described above when thread breakage is detected during automatic embroidery. The outputs of the automatic back movement amount set counter 4, axis command register 5, direction command register 6, etc. are connected to a pulse motor drive section 9 via a pulse motor drive interface section 8. The motor of the frame moving device 10 is driven by the pulse motor drive section 9, and the frame is returned to the position before the m stitches.

FIG. 2 is a flowchart schematically showing the operation of the embodiment shown in FIG. 1 from detection of thread breakage to restart. When the number n of stitches that have progressed from the start until the yarn breakage is detected is smaller than or equal to the number m of stitches set in the automatic back stitch number setting section 7, the sewing machine is driven to the starting point. m<
In the case of n, in response to thread breakage detection, the frame movement amount of the previous m stitches is calculated in the central processing unit 2, and the frame is then linearly returned to the position before the m stitches and waits for a restart. becomes.

In the above description, only the portion of the block diagram of FIG. 1 relating to the automatic backing that is directly related to the present invention has been described, and the description of other needle drive units, data input/output units, etc. has been omitted.

As described above, the present invention allows the number of stitches to be automatically backtracked when the thread breaks to be set to an optimal arbitrary value by a simple operation, depending on the embroidery conditions such as the type of embroidery thread, the content of the embroidery pattern, and machine variations. This can prevent deterioration of embroidery joints due to thread breakage and provide a more natural embroidered finish.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
The figure is an operation flow diagram. 1...Data storage unit, 2...Central processing unit, 3...
...Thread breakage detection unit, 4...Automatic back movement amount set counter after thread breakage detection, 5...Axis command register,
6...Direction command register, 7...Automatic backstitch number setting section, 8...Pulse motor drive interface section, 9...Pulse motor drive section, 10...
...Frame moving device.

Claims (1)

[Scope of Claims] 1. In an automatic embroidery machine that automatically performs embroidery according to a preset program, a thread breakage detection unit that detects thread breakage during embroidery, and the type of thread, content of the pattern, and machine. an automatic back stitch number setting unit that can arbitrarily set the number m of automatic back stitches after thread breakage according to the embroidery conditions of variations in the number of stitches; An automatic embroidery machine characterized by having a means for automatically returning the embroidery machine. 2. The automatic embroidery machine according to claim 1, wherein the automatic embroidery machine is configured to return to the embroidery starting point if the number n of executed stitches from the embroidery starting point is smaller than the set number m of automatic back stitches when a thread breakage is detected.