JPS6315867B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sewing machine equipped with a presser foot device that automatically moves a workpiece to be sewn in a predetermined pattern, and particularly relates to an improvement for improving the productivity thereof.

FIG. 1 shows the appearance of a conventional general automatic sewing machine. This automatic sewing machine includes a sewing machine mechanism section 12 that has a built-in mechanism for forming stitches on a workpiece with a needle bar 18 on the top surface of a sewing machine table 10, a motor 13 that drives this sewing machine mechanism section, and A cloth presser device 14 that presses and clamps the cloth between an upper presser plate 20 and a lower presser plate 22 by air, and a cloth presser device 14 that moves the cloth presser 14 two-dimensionally according to a predetermined pattern on a sliding plate 24. A shaft drive mechanism 16 is provided. A control device 26 is provided on the sleeve of the sewing machine table 10 to centrally control the operations of the above-mentioned parts.
are provided in two levels, upper and lower. This control device 26
The upper part includes an operation panel 28 on which various switches for regulating the operation of the automatic sewing machine are arranged;
It has a data reading device that attaches and detaches a storage medium 30 that stores data on movement patterns of the two-axis drive mechanism 16 and reads the data, and performs overall timing control and movement control of the two-axis drive mechanism 16.

The operation panel 28 has power switches 32 and 2.
A reset switch 34 that positions the shaft drive mechanism 16 to a predetermined position and resets the system, a test switch 36 that drives the two axes according to sewing data without moving the needle, and a presser foot switch 38 that clamps and releases the presser foot device 14, etc. It is provided.

Further, a start switch 40 is provided at the bottom of the automatic sewing machine to issue a command to start sewing.
The sewing machine mechanism section 12 is provided with a stop switch 42 for stopping sewing halfway. Further, the two-axis drive mechanism 16 is provided with an origin detection device 44 that detects the mechanical origins of the two axes.

Next, the operation of the automatic sewing machine configured as described above will be explained. First, the power switch 32 of the control device 26 is closed to start the motor 13. Next, the reset switch 34 is closed, and the presser foot device 1 is closed.
4 to a predetermined position (hereinafter referred to as machine origin) by the origin detection device 44.
move by. After positioning the workpiece by placing it between the upper presser plate 20 and the lower presser plate 22, the presser foot switch 38 is closed and an air cylinder (not shown) is activated. , press down the upper presser plate 20 with the pressure plate 46 and lower the lower presser plate 22.
The work to be sewn is held between the two. Next, the start switch 40 is closed, predetermined pattern data programmed in the storage medium 30 is read out, and based on the read data, the sewing machine mechanism 12 and the two-axis drive device 16 are driven, and the presser foot device 14 is driven. The sewing machine is moved to form stitches in a predetermined pattern on the workpiece.

When the sewing is finished, the sewing thread is automatically cut, the sewing machine mechanism 12 stops, and the presser device 14 driven by air releases the clamping of the material to be sewn. These series of operations are controlled by the control device 26.

During the above operation, the presser foot device 14 is moved from the machine origin to the sewing start position (without driving the sewing machine) based on pre-programmed pattern data, starts sewing, and finishes sewing. When this occurs, the machine moves to the machine origin by the pattern data end command and the action of the origin detection device 44, and then stops. This program consists of one series of operations from the start to the end of sewing, and the stop switch 4 is set midway.
By operating 2 or by programming a mid-way stop command, sewing can be stopped mid-way.

Conventional automatic sewing machines are configured as described above, and when sewing is stopped midway, the presser foot device 14
In order to prevent the workpiece from shifting when restarting, the sewing machine kept holding the workpiece. Therefore, the sewing operation is standardized and has no flexibility, which sometimes causes inconvenience in sewing.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to select whether to clamp or release the workpiece by a presser foot device when sewing is stopped midway through by a predetermined signal. Our goal is to provide automatic sewing machines that can.

In order to achieve the above object, the present invention includes: a sewing machine mechanism that forms stitches on a workpiece; a presser foot device that presses and clamps the workpiece between an upper presser plate and a lower presser plate; In an automatic sewing machine equipped with a two-axis drive mechanism that moves this presser foot device in a predetermined pattern and a control device that centrally controls the operation of each of these parts, there is a mid-way stop means that stops sewing mid-way, and when the sewing is stopped mid-way. a selection means for selecting and setting in advance whether the presser foot device is to be pressed against or released from the workpiece; and a selection means for setting the workpiece clamping position or the workpiece clamping position based on a selection signal from the selection means. The control device is further provided with a presser foot device driving means for moving the presser foot device to the open position.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 2 is a block diagram of a control unit of an automatic sewing machine to which the present invention is applied. In FIG. 2, the control device 26 includes a CPU 48, a RAM 50,
It consists of a PROM 52, a recording medium 30, etc. CPU
48 performs all controls, PROM 52 stores system programs in advance, and RAM 52 stores system programs in advance.
50 operates as a stack RAM for the CPU 48.

The storage medium 30 stores in advance an instruction code indicating only an intermediate stop, or an instruction code indicating an intermediate stop/release of the presser foot device. Further, when the midway stop switch 42 is operated or when sewing is stopped by a command code indicating only a midway stop, the option allows selection of whether the presser foot device 14 should clamp or release the workpiece to be sewn. switch 54
have. The above-mentioned sections are configured to mutually transmit signals via a bus 56.

Figure 3 is a block diagram of the main part, and shows the bus 56.
Ports 58 and 60 are connected to one of the ports 58, a selection switch 54 and a resistor 62 are connected to the other port 60, and an air solenoid valve 64 for driving the presser foot device 14 is connected to the other port 60. There is.

Next, the operation of the automatic sewing machine of the present invention constructed as described above will be explained. Now, taking the sewing pattern as shown in FIG. 4 as an example, 66 is the sewing area of the automatic sewing machine, 68 is the machine origin of the automatic sewing machine, and the broken line 70 is the locus of movement of the needle position by idle feed without sewing. The solid line indicates the trajectory of actual sewing. In other words, the needle position moves from the machine origin 68 to the sewing start position 74 with a blank feed, and sewing starts from this position at the relay position 7.
6 and stops midway at an intermediate stop position 78, and when restarted, the thread passes through a relay position 80, cuts the thread at a sewing end position 82, and returns to the machine origin 68 by idle feeding.

In the above operation, when the start switch 40 is operated, the CPU 48 sequentially reads out the sewing data having the bit configuration shown in FIG. Sewing start position 7 from machine origin 68 by feeding
After moving to position 4, actual sewing is performed by moving through positions 74-76-78. And needle bar 1
8 reaches the intermediate stop position 78, the CPU 48 reads the intermediate stop/presser foot release command code (81H, 00H) shown in FIG. 7, and the sewing machine mechanism section 12 cuts the thread and stops at the needle-up position. 2-axis drive mechanism 1
6 also stops. At this time, at the same time, as shown in FIG. 3, the CPU 48 outputs a signal to the port 60 to open the presser device 14, and operates the air solenoid valve 64.

Next, replace the workpiece and turn the presser foot switch 38.
is operated to force the presser foot device 14 to clamp the workpiece again. Then, when the start switch 40 is operated, sewing starts from the halfway stop position 78, and the needle bar 1
8 moves through positions 78-80-82, stops after thread trimming at sewing end position 82, and returns to machine origin 6 with idle feed.
Return to step 8 to complete one sewing pattern. As described above, by changing the workpiece at an intermediate stop position, it is possible to efficiently sew symmetrical figures alternately on the left and right sides.

When the command code (80H, 00H) for only a midway stop shown in FIG. 6 is stored in a location corresponding to the midway stop position 78, the presser foot device 14 continues to clamp the workpiece. Further, by operating the selection switch 54 shown in FIG. 3, the presser foot device 14 can be made to release the workpiece at the halfway stop position 78 using only the command code for stopping midway as shown in FIG. You can choose to leave it in the clamped state. CPU 48 is selection switch 54
When the voltage value of is read through the port 58 and the command code of the storage medium 30 is read, the air solenoid valve 64 is operated to the state selected by the selection switch 54, that is, to open or clamp the object to be sewn.
This selection switch 54 is an intermediate stop switch 42.
It performs the same function when operated. The above operation is the same even if multiple instruction codes are used and the midway stop switch is operated multiple times.

As described above, by adding the midway stop/presser foot release code or the selection switch 54,
It is possible to replace the object to be sewn at a desired sewing stage.

In the above embodiments, a cloth presser device is shown, but the present invention can also be applied to an attachment/detachment device such as a cassette type presser, and the same effects as in the above embodiments can be obtained.

As explained in detail above, in the automatic sewing machine according to the present invention, it is possible to select whether or not to release the workpiece by the presser foot device when stopping during sewing, so that when sewing a symmetrical figure, the right or left side can be used. can be sewn alternately, increasing the sewing efficiency for sewing symmetrical pairs. Also, when performing second, third, etc. sewing on one workpiece at a position beyond the sewing area, or when placing the next workpiece on top of the first workpiece and holding it in the presser foot device. This method is effective when sewing large objects to be sewn together in one step, and can greatly improve productivity.

[Brief explanation of the drawing]

FIG. 1 is an external view of a conventional automatic sewing machine, FIG. 2 is a block diagram of a control device section of an automatic sewing machine according to an embodiment of the present invention, and FIG. 3 is a block diagram of its main parts.
Fig. 4 shows a specific example of a sewing pattern, Fig. 5 shows a bit structure of sewing data, Fig. 6 shows a bit structure of a midway stop command code, and Fig. 7 shows a bit structure of a midway stop/presser foot release command code. It is a diagram. The same members in each figure are given the same reference numerals, 12 is the sewing machine mechanism, 14 is the presser foot, 16 is the two-axis moving mechanism, 26 is the control device, 30 is the storage medium, 40 is the start switch, and 42 is the intermediate Stop switch, 4
4 is an origin detection device, 48 is a CPU, 54 is a selection switch, 64 is an air solenoid valve, 68 is a machine origin, and 78 is an intermediate stop position.

Claims (1)

[Claims] 1. A sewing machine mechanism unit that forms stitches on a workpiece;
A presser foot device that presses and holds the workpiece between an upper presser plate and a lower presser plate, a two-axis drive unit that moves and controls the presser foot device to a predetermined position, and a control device that centrally controls the operations of each of the above parts. In an automatic sewing machine having: an intermediate stop means for stopping the sewing operation in the middle; and a selection for setting in advance whether the presser foot device is pressed against or released from the workpiece at the time of the intermediate stop. and a presser foot device drive means for moving the presser foot device to a workpiece clamping position or a release position based on a selection signal from the selection means. .