JPH01259896A - Controller for automatic sewing machine - Google Patents

Abstract

PURPOSE:To prevent a sewing machine from running away, by releasing inhibition, when the working of the axially driving means of the machine is inhibited with a protective means, in an initial state after making a power source, and the OFF-state of cloth keeping and machine starting switches is detected. CONSTITUTION:When in an initial state after making a power source, a cloth press switch 11 to be generally in an OFF-state is ON, then a protective device 23 is not turned OFF. Accordingly, in spite that a sewn object is not yet set, a cloth pressing means is moved down, and even if a sewing machine start switch 10 is ON, the protective device 23 is kept On at the time of switching the power source on, and so an alarm circuit 24 is worked, and the faults of the cloth press switch 11 and the sewing machine start switch 10 are to be alarmed. Accordingly, as long as the cloth press switch 11 and the sewing machine start switch 10 are not reset in a normal state by switching off the power source once, sewing work cannot be started, and the sewing machine can be prevented from running away, namely, the sewing machine operates uncontrollably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for an automatic sewing machine that prevents the sewing machine from running out of control due to a failure of a presser foot switch, a sewing machine start switch, or the like.

[Prior Art] FIG. 3 is a schematic diagram of a conventional control device for an automatic sewing machine. In Fig. 3, (1) is the sewing machine head, (21) is a microcomputer, (17) is FROM which stores sewing pattern data, and (to) is a device for rotating the sewing machine shaft (not shown). The start switch (11) is a presser foot switch for raising and lowering the presser foot.

Next, FIG. 4 is a detailed block diagram of a control device for the conventional automatic sewing machine shown in FIG. 3. In Figure 4,
(2) is a position detector that outputs a predetermined number of pulses, a needle down position signal and a counted position signal of the sewing machine needle (not shown) by rotating together with the upper shaft (not shown) of the sewing machine head (1). (3) is the motor that rotates the sewing machine (shaft), (
4) is a driver that drives motor (3), (5) , (
G) is a pulse motor that drives a presser foot (not shown) in the orthogonal X and Y directions, (7) and (8) are pulse motors (5) and a driver that drives (G), and (9) is a driver that drives pulse motors (5) and (G). The driver (7) sends a pulse corresponding to the specified cloth feed amount.
(12) is a central processing unit (hereinafter referred to as CPU), (13), (1)
4) is an input/output port, (15) is a memory for system control, (16) is a data memory for temporarily storing data, (18) is a data bus, (19) is an address bus, (20) is a pulse This is an XY drive mechanism section consisting of motors (5) and (6).

Next, the operation of the control device of the conventional automatic sewing machine will be explained with reference to the flowchart shown in FIG.

(1) Steps 81 to S4 After the power is turned on, the microcomputer (21) is initially reset (Step St).

The CPU (12) determines the state of the presser foot switch (11). (Step S2), presser foot switch (11)
is not stepped on, the presser foot switch (11) is off, and the CPU (12) releases the presser foot (
Step S3). Also, when the presser foot switch (11) is depressed, the presser foot switch (11) is turned on, so
CPU (12) lowers the presser foot and clamps the workpiece (step S4).

(2) Steps 85 to S7 CPU (12) is the sewing machine start switch (10)
(step 85). CPU (12
) is when the sewing machine start switch (10) is on.
A drive signal is output to the driver (4) via the input/output capo (13). Motor (3) is activated by the output of the drive signal.
begins to rotate, and the sewing machine shaft rotates (step SS).

Simultaneously with the output of the drive signal, the CPU (12) reads fabric feed data for one stitch from the pattern data memory (17) in synchronization with the output of the needle down position signal of the sewing machine, and sends the read data to the input/output port. It is output to the sending pulse train generation circuit (9) via (13).

The feed pulse train generation circuit (9) generates pulse signals equivalent to the entire cloth feed synchronized with the rotation of the sewing machine to the drivers (7) and (8).
). The drivers (7) and (8) drive the pulse motors (5) and (6), respectively, to move the presser foot by a predetermined cloth feed amount and perform one stitch of sewing (step 37).

The CPU (12) repeats steps 82 to S7 until sewing of one pattern data is completed.

[Problems to be Solved by the Invention] By the way, the control device of the conventional automatic sewing machine having the above-mentioned configuration has problems such as failure of the presser foot switch (11) and sewing machine start switch (10), failure of the presser foot switch (11) and sewing machine start switch, etc. When changing from a 2-pedal system in which the (1O) and 1O are operated by separate pedals to a 1-pedal system in which the 10 and 2 pedals are operated by a single pedal, if there is a wiring error, etc., the presser foot switch (11) may not be pressed. , CPU (
12) determines that the presser foot switch (11) is on, lowers the presser foot without setting the material to be sewn, and then rotates the sewing machine. There was a problem in that the sewing machine operated and the sewing object was damaged.

The present invention has been made to solve the above problems,
Presser foot switch (11) and sewing machine start switch (
It is an object of the present invention to provide a control device for an automatic sewing machine that prevents the sewing machine from running out of control due to failures such as lO) and incorrect wiring.

[Means for Solving the Problems] A control device for an automatic sewing machine according to the present invention includes a protection means for prohibiting at least the operation of the sewing machine shaft driving means in an initial state after power is turned on, and a protection means for prohibiting operation of at least a sewing machine shaft drive means in an initial state after power is turned on. , state detection means for detecting the on/off state of at least a presser foot switch for driving a presser foot that clamps the workpiece and a sewing machine start switch for rotating the sewing machine shaft;
The sewing machine includes protection release means for releasing the protection from the protection means against the operation of the sewing machine shaft drive means when the state detection means detects that at least the presser foot switch and the sewing machine start switch are in the OFF state.

[Function] In the control device of the above-mentioned automatic stitching sewing machine, the protective means prohibits the operation of the sewing machine shaft drive means in the initial state after the power is turned on.On the other hand, in the initial state after the power is turned on, the The means is to turn on/off the presser foot switch and sewing machine start switch.
The off state is detected, and when the state detection means detects the off state of the presser foot switch and the sewing machine start switch, the protection release means releases the prohibition of the operation of the sewing machine shaft drive means by the protection means.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a control device for an automatic sewing machine according to an embodiment of the present invention.

In FIG. 1, parts that perform the same functions as those in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted.

Further, the microcomputer (21) has the same configuration as that shown in FIG.

In FIG. 1, reference numeral 23) is a protection device determined by the microcomputer (21) to operate the alarm circuit (24) without rotating the sewing machine (1).

The protection device (23) operates in the initial state after the power is turned on by the microcomputer (21) according to the judgment results of the conditions of the presser foot switch (11> and the sewing machine start switch (lO)) to prevent damage to the workpiece. It works to prevent this and increase the safety of sewing work.

Next, the operation of the control device of the automatic sewing machine shown in FIG. 1 will be explained with reference to the flowchart shown in FIG.

First, the operation when the presser foot switch (11) and the sewing machine start switch (10) are in the OFF state, that is, in the normal state after power is turned on, will be described.

(1) Step 5L-82 When the power is turned on and the microcomputer (21) is initialized (step SL), the CPU
(12) turns on the protection device (23) (step 8
2).

(2) Steps 83 to S5 CP U (12) determines the state of the presser foot switch (11); step S3); if the presser foot switch (11) is not depressed, the presser foot switch (11) is turned off; Therefore, the presser foot switch (11) is opened (step S4), and the protection device (23) is turned off (step S5).

The CPU (12) is in a standby state by repeatedly executing steps 83 to S5 until the presser foot switch (11) is stepped on and turned on.

(3) Steps 86 to S8 When the workpiece is set and the presser foot switch (11) is turned on, the CPU (12) drives the presser foot to clamp the workpiece with the presser foot. (Step 8B).

Next, the CPU (12) determines the state of the sewing machine start switch (10) (step S7), and when the sewing machine start switch (10) is off, the protection device (23) is turned off.
) is turned off (step 38). This protection device is turned off when the sewing machine start switch (10) is in a normal state, that is, in an off state, in the initial state after the power is turned on.

CPU (12) is the sewing machine start switch (10)
Steps S3, S6 and S until is stepped on and turned on.
By repeatedly executing step 7, the computer is in a standby state.

(4) Steps 89 to 812 CPU (12) is the sewing machine start switch (IO)
When it is turned on by being stepped on, the state of the protection device (23) is determined (step 89). When the protection device (23) is on, the CPU (12) operates the alarm circuit (24) (step 810).

Further, when the protection device (23) is off, the CPU (12) outputs a drive signal to the driver (4) via the input/output port (13). The output of the drive signal causes the motor (
3) starts to rotate, and the sewing machine shaft rotates (step 51).
1). In addition, the CPU (12) reads fabric feed data for one stitch from the pattern data memory (17) in synchronization with the output of the needle down position signal of the sewing machine, and sends the read data through the input/output board (13). feed pulse train generation circuit (
9).

The feed pulse train generation circuit (9) generates pulse signals equivalent to the entire cloth feed synchronized with the rotation of the sewing machine to the drivers (7) and (8).
). The drivers (A) and (8) drive the pulse motors (5) and (6), respectively, and move the presser foot by a predetermined cloth feed amount to perform one stitch of sewing (step 512).

The CPU (12) executes steps S3, S6, and S7 until the sewing of one pattern data (pattern data) is completed.
, S9, Sll and S12 are repeated.

Next, a protective operation when the 41 presser switch (11) and the sewing machine start switch (lO) are out of order will be described.

As mentioned above, the two-pedal system in which the presser foot switch (11) and the sewing machine start switch (10) are operated using separate pedals has been replaced with the two-pedal system in which the presser foot switch (11) and the sewing machine start switch (10) are operated using a single pedal. Operate 1
If there is a wiring mistake when changing to the pedal method, etc.
After the power is turned on, both the presser foot switch (11) and the sewing machine start switch (10) are turned on.

If the presser foot switch (11), which should originally be turned off, is turned on in the initial state after the power is turned on, the protection device (23) will not turn off. Therefore, even though the workpiece has not been set yet, the presser foot is lowered (see step S6), and the sewing machine start switch (lO
) is on, the protection device (23) remains on when the power is turned on (see step S2), so the alarm circuit (20) is activated and the presser foot switch (11) and sewing machine start switch (10) are activated. (step 510).

Therefore, first turn off the power and press the presser foot switch (11).
Steps S3, S6.87, S9 and S1 unless the sewing machine start switch (10) is restored to normal condition.
If you simply repeat 0, you will not be able to start sewing.

That is, even if the workpiece is not set, the presser foot Ii is lowered (see step S6), but the sewing machine does not rotate (see step 911), so damage to the workpiece is prevented.

In addition, in order to rotate the sewing machine (1), it is necessary to set the workpiece to be sewn and operate the cloth presser switch (11) and the sewing machine start switch (lO). This can be expected to improve safety by preventing the vehicle from starting to move.

In this embodiment, a case has been explained in which the presser foot switch (11) and the sewing machine start switch (10) are out of order. Even in the case of a failure, the alarm circuit (24) can be operated by the same process as in this embodiment.

Furthermore, in this embodiment, the status of the presser foot switch (11) and the sewing machine start switch (lO) are monitored, but if necessary, the operation of the sewing machine can be controlled according to the status of other switches to ensure safety. You may also do so.

[Effects of the Invention] As explained above, according to the present invention, the operation of the sewing machine shaft driving means is prohibited by the protection means in the initial state when the power is turned on, and the state detection is performed in the initial state after the power is turned on. When the means detects that the presser foot switch and the sewing machine start switch are in the OFF state, the protection release means releases the prohibition of the operation of the sewing machine shaft drive means by the protection means, so that the initial state after the power is turned on is changed. It is possible to prevent the sewing machine from starting to move out of control, improving safety during sewing work, and preventing damage to the workpiece.
This has the effect of providing a control device for an automatic sewing machine that can be expected to improve productivity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device for an automatic stitch sewing machine according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the control device for the automatic stitch sewing machine shown in FIG. 1, and FIG. FIG. 4 is a block diagram of the microcomputer shown in FIGS. 1 and 3, and FIG. 5 shows the operation of the control device of the automatic sewing machine shown in FIG. 4. It is a flowchart. In each figure, 1 is a sewing machine head, 1O is a sewing machine start switch, 11 is a presser foot switch, 17 is a PROM, 21 is a microcomputer, 23 is a protection device, and 24 is an alarm circuit. It should be noted that the ``-'' numbers in the middle of each figure indicate the same or equivalent parts.

Claims (1)

[Claims] Due to the operation of the presser foot switch and the cloth presser switch,
A presser foot that clamps the workpiece, a positioning means that drives the presser foot and positions the workpiece at a predetermined position according to preprogrammed data, a sewing machine start switch, and an operation of the sewing machine start switch. ,
In a control device for an automatic sewing machine including a sewing machine shaft driving means for rotating the sewing machine shaft in synchronization with the positioning of the workpiece by the positioning means, at least the sewing machine shaft driving means is in an initial state after power is turned on. a protection means for prohibiting the operation; a state detection means for detecting the on/off state of at least the presser foot switch and the sewing machine start switch; and at least the presser foot switch and the sewing machine start switch in an initial state after the power is turned on; an automatic sewing machine, characterized in that the automatic sewing machine is equipped with a protection release means for releasing the prohibition of the operation of the sewing machine shaft drive means by the protection means when the state detection means detects that the sewing machine shaft drive means is in an OFF state. Control device.