JPH0112516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic sewing machine that forms a stitch pattern by reading stitch pattern data stored in a storage medium.

[Prior art]

A conventional automatic sewing machine of this type is shown in FIG. In the figure, 1 is a sewing machine, 2 is a two-axis drive device for moving a presser foot device 4 that clamps a workpiece (sewn product) using air pressure according to predetermined pattern data, 3 is a sewing machine table, 5
6 is a storage medium storing preprogrammed pattern data, and 6 is a sewing machine 1 and a two-axis drive device 2.
8A and 8B are operating devices for operating the drive of the automatic sewing machine, 9 is a power switch, and 10 is a reset device for positioning the two-axis drive device 2 at a predetermined position and resetting the system. 11 is a test switch for driving the two-axis drive device 2 according to the sewing data without moving the needle of the sewing machine; 12 is an origin detection device for detecting the mechanical origin of the two-axis drive device 2; 14 is a test switch for driving the two-axis drive device 2 according to the sewing data without moving the needle of the sewing machine; Pedal-type start switch for starting, 1
5 is a motor for the sewing machine, 16 is a halfway stop switch,
Reference numeral 17 denotes a presser foot switch for clamping and releasing the presser foot device 4.

Next, the operation of the automatic sewing machine having such a configuration will be explained.

First, the sewing machine motor 15 is started by operating the power switch 9 of the operating device 8A. Next, the reset switch 10 is operated to drive the two-axis drive device 2 to a position predetermined by the origin detection device 12 (hereinafter referred to as the machine origin) to move the presser foot device 4. Next, the workpiece is held between the presser foot device 4, the start switch 14 is operated, and the two-axis drive device 2 is driven according to predetermined pattern data programmed in the storage medium 5, so that the presser foot device 4 The workpiece held between the two is moved to a predetermined position, and at the same time, the sewing machine 1 is also driven to form stitches.

When the sewing is completed, the sewing thread is automatically cut, the sewing machine 1 is stopped, and the presser foot device 4 releases the grip on the workpiece. These series of operations are controlled by the control device 6. The pre-programmed pattern data is used to automatically move the workpiece to the sewing start position without driving the sewing machine 1, start sewing, and at the same time as the pattern data end command is sent when sewing is finished. The origin detection device 12 causes the machine to move to the machine origin and then stop. This program consists of a series of operations from the start to the end of sewing, but the stop switch 16
You can stop sewing in the middle by operating .

However, in conventional automatic sewing machines,
When the sewing operation is stopped midway using the halfway stop switch, there is a drawback that the sewing operation remains fixed at the needle up position after thread trimming or at the needle up position without thread trimming.

[Summary of the invention]

The present invention has been made in order to eliminate such conventional drawbacks, and when the sewing operation is stopped in the middle of sewing by the midway stop switch, the needle can be stopped at the upper position after thread trimming, or the needle without thread trimming can be stopped at will. The object of the present invention is to provide an automatic sewing machine having a selection function that allows stopping at the upper position.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 2 is a block diagram of an embodiment of an automatic sewing machine according to the present invention, and FIG. 3 is a partially detailed block diagram. In the figure, the same parts as in FIG. 1 are given the same reference numerals. In addition to the storage medium 5, the control device 6 includes a CPU 2 that performs all controls.
0, a PROM 21 in which a system control program is stored in advance, and a RAM 22 that operates as a stack memory for the CPU 20. 23 is a selection switch for selecting whether to stop the needle in the upper position after thread trimming or to stop the needle in the upper position without thread trimming when the midway stop switch is operated; 24 is a thread trimming solenoid;
5 is a thread cutting mechanism, and 26 is a bus line.

When the thread cutting solenoid 24 is actuated by a signal supplied to the thread cutting solenoid 24 via the bus line 26, the thread cutting mechanism 25 is driven to perform thread cutting. Therefore,
The thread cutting mechanism 25 is activated or deactivated depending on the presence or absence of a signal to the thread cutting solenoid 24.

In FIG. 3, 27 is a pull-up resistor, and 28 and 29 are input/output ports.

Next, the operation of such a configuration will be explained using the sewing pattern shown in FIG. 4 as an example.

In FIG. 4, 30 is the sewing area of the automatic sewing machine, 31 is the machine origin of the automatic sewing machine, and 32 to 36 are points in the middle of sewing. The broken line represents the trajectory of the needle position during idle feed without sewing, and the solid line represents the trajectory of actual sewing.

When the start switch is operated, a series of operations is started, and the needle position is first read out sequentially from the machine origin 31 to the stitch pattern data stored in the storage medium 5, and then is moved in a free feed according to this data. The sewing machine moves to point 32, then operates through points 33, 34, and 35 to point 36 to perform actual sewing. After the thread trimming needle is stopped at the upper position at point 36, it returns to the machine origin 31 by idle feeding, and one sewing pattern is completed.

During this cycle, if the halfway stop switch is operated, for example, at a point 34 during actual sewing, the sewing machine is controlled to stop at the needle-up position at this point 34. At this time, by operating the selection switch 23, the input information from the port 28 is transmitted to the output of the port 29 via the CPU 20.
ON/OFF control allows you to select a stop after thread trimming or a stop without thread trimming.

FIG. 5 shows a bit configuration diagram of the stitch pattern data stored in the storage medium 5, where one stitch is equal to 2 bits.
Consists of bytes, 40 is a 1-bit X-axis code,
41 is the same 1-bit Y-axis code, 42 is the 2-bit sewing machine control code, 43 is the 2-bit sewing speed data, 44 is the 5-bit X-axis feed data, and 45 is the 5-bit Y-axis feed data. .

〔Effect of the invention〕

As described above, according to the automatic sewing machine according to the present invention, when sewing is stopped midway by operating the midway stop switch, it is possible to arbitrarily select whether or not to cut the thread when the needle is stopped at the upper position. Generally, the midway stop switch is operated when the thread breaks, the bobbin thread runs out, or when the thread becomes tangled in the sewing mechanism. Alternatively, when stopping a series of operations, selecting whether or not to cut the thread improves operability and streamlines the work.

[Brief explanation of drawings]

Figure 1 is an external perspective view of a conventional automatic sewing machine, Figure 2
The figure is a block diagram of an embodiment of an automatic sewing machine according to the present invention, FIG. 3 is a detailed block diagram of main parts, and FIG.
The figure is a sewing pattern diagram, and FIG. 5 is a bit configuration diagram of stitch pattern data. DESCRIPTION OF SYMBOLS 1... Sewing machine, 2... 2-axis drive device, 4... Fabric presser device, 5... Storage medium, 6... Control device, 14... Start switch, 15... Sewing machine motor, 16... Intermediate stop switch, 23... Selection switch, 24 ... Thread cutting solenoid, 25... Thread cutting mechanism.

Claims (1)

[Claims] 1. In an automatic sewing machine having means for sequentially reading out data from a storage medium storing stitch pattern data to form a stitch, and a stopping means that operates when stopping in the middle of sewing, operating a thread cutting means when stopping halfway, An automatic sewing machine characterized by being able to select a non-operating state.