JPH0832284B2 - Control device of automatic sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention controls an automatic sewing machine that sewes a material to be squeezed by a cloth pressing mechanism while driving it according to a predetermined sewing pattern according to preprogrammed data. The present invention relates to an apparatus, and more particularly, to an improvement of an area limit function for preventing a damage by restricting a movement range of a cloth pressing mechanism.

[Prior Art] FIG. 3 is a block diagram showing a control device of a general automatic sewing machine.

In FIG. 3, (1) is a sewing machine head, and (2) is a detector. The detector (2) is connected to an upper shaft (not shown) provided on the sewing machine head (1), and rotates together with the upper shaft to generate a specific number of pulses and position signals below and above the needle. To do. (3) is a motor for rotating the sewing machine, and (4) is a driver for driving the motor (3). (5), (6)
Is a pulse motor that drives the cloth presser mechanism (21) (see also FIG. 4) two-dimensionally in both orthogonal XY directions, (7)
And (8) are drivers for driving the pulse motors (5) and (6). (9) is a feed pulse train generation circuit that supplies pulses corresponding to the specified cloth feed amount to the drivers (7) and (8), (10) is a sewing machine start switch, and (11) is an upper cloth presser plate (4th). It is a work clamp switch that moves (Fig.) Up and down. (12) is a central processing unit, (13) and (14) are data input / output ports, (15) is a system control memory, (16) is a data time memory, (17) is a pattern data memory, (18) ) Is a data bus, (19) is an address bus, and (20) is an XY drive mechanism having pulse motors (5) and (6).

FIG. 4 is a structural explanatory view of the XY drive mechanism section (20) of FIG. In FIG. 4, (5) is an X-axis pulse motor, (6) is a Y-axis pulse motor, (21) is a presser foot mechanism,
(22) is an upper presser plate, (23) is a lower presser plate, (24) is an X-axis drive belt, (25) is an X-axis feed transmission mechanism section, (26) is a Y-axis drive belt, and (27) ) Is a Y-axis feed transmission mechanism section.

Next, the operation of the conventional automatic sewing machine will be described with reference to FIG. When the cloth presser switch (11) shown in FIG. 3 is depressed, the upper cloth presser plate (22) is lowered and the workpiece is held by the cloth presser mechanism (21). Subsequently, the sewing machine start switch (10) is closed, and the central processing unit (12) drives the driver (4) through the input / output port (13). As a result, the motor (3) is driven and the sewing machine starts operating. At the same time, the central processing unit (12) reads the cloth feed data for one stitch from the pattern data memory (17) containing the sewing pattern data in synchronization with the needle down position signal of the sewing machine, and the input / output port ( The data is sent through 13) and output to the pulse train generation circuit (9). The pulse train generation circuit (9) outputs pulses corresponding to the cloth feed amount synchronized with the rotation of the sewing machine to the drivers (7) and (8), and the drivers (7) and (8) output the pulse motor (5) for each axis. , (6)
Is driven to sequentially and two-dimensionally move the cloth pressing mechanism (21) by a predetermined feed amount.

The area limit function in this case is controlled according to the flowchart of the area limit subroutine shown in FIG.

FIG. 5 is a positional relationship configuration diagram of a physical area limit and a reference point for explaining the flowchart of FIG.

First, the symbols used in FIGS. 5 and 6 will be described. A in FIG. 5 is an area physically showing the operation range of the area limit function, which is set in advance on the sewing surface of the sewing machine main body. O ₀ (X = 0, Y = 0) is area limit A
The origin of 0, O ₁ (X = x1, Y = y1) is the reference point when the work clamp mechanism (21) moves. As the reference point O ₁ , for example, the center position of the upper cloth pressing plate (22) is selected.

In addition, [POS] in FIG. 6 is the direction of the reference point O ₁ moved from the origin O ₀ , and [+ XLM] and [−XLM] are the X-axis positive directions of equal distribution centered on the origin O _0. Negative direction limit value (moving limit distance), [+ YLM] and [-YLM] are Y-axis positive and negative limit values (moving limit distance) of Y-axis equally distributed around origin O ₀ , [MOVE] Is the distance from the origin O ₀ to the reference point O ₁ (data).

In step 21 in the flowchart of FIG.
Judge the direction of the reference point O ₁ of the axis, and if it is the positive direction, step 22
If the direction is negative, proceed to step 23. In step 23, [−XLM] and [MOVE] are compared, and [−XLM] ≧ [MOV
If it is not E], that is, if the reference point O ₁ exceeds the X-axis negative direction limit value, the process proceeds to step 27, and [-XLM].
If ≧ [MOVE], that is, if the reference point O ₁ is within the range of the X-axis negative direction limit value, the process proceeds to step 24.

Next, in step 24, the direction of the Y-axis reference point O ₁ is determined. If the direction is positive, the process proceeds to step 25, and if it is the negative direction, the process proceeds to step 26. In step 26, [-YLM] and [MOVE]
And [-YLM] ≧ [MOVE], that is, when the reference point O ₁ exceeds the Y-axis negative direction limit value,
Proceed to step 27, and if [−YLM] ≧ [MOVE], that is, if the reference point O ₁ is within the range of the Y-axis negative direction limit value,
The work clamp mechanism (21) judges that it is within the range of the area limit A, and completes the normal operation.

In step 22, compare [+ XLM] and [MOVE],
[+ XLM] ≧ [MOVE], that is, the reference point O ₁ is X
If it exceeds the axis positive direction limit value, proceed to step 27. If [+ XLM] ≧ [MOVE], that is, if the reference point O ₁ is within the range of the X axis positive direction limit value, proceed to step 24. In step 25, [+ YLM] and [MOVE] are compared, and if [+ YLM] ≧ [MOVE], that is, the reference point O ₁
Is over Y-axis direction limit value, step 27
Go to [+ YLM] ≧ [MOVE], that is, reference point O ₁
Is within the range of the Y-axis positive direction limit value, it is determined that the work clamp mechanism (21) is within the range of the area limit A, and the normal operation is completed.

At step 27, since it is outside the range of the area limit A when it comes to this step, the alarm circuit is activated to inform that the sewing machine is operating abnormally, and the routine proceeds to step 28. Then, in step 28, the sewing machine is stopped.

[Problems to be Solved by the Invention] In the conventional device described above, when the presser foot mechanism (21) is moved, the function for correcting the movement amount [MOVE] of the origin O ₀ is not included, so it is set. Only the shaded area in FIG. 5 will protrude from area limit A. As a result, there is a problem in that the cloth pressing mechanism (21) comes into contact with the sewing machine head (1) and the like, which causes trouble in sewing.

The present invention has been made to solve such a problem, and is configured to correct the movement amount of the cloth pressing mechanism by the area limit function when the cloth pressing mechanism is moved by a certain distance from the origin. It is therefore an object of the present invention to provide a control device for an automatic sewing machine, which enables good sewing and prevents damage to the cloth pressing mechanism.

[Means for Solving the Problem] In order to achieve such an object, in the area limit function of the present invention, whether the cloth pressing mechanism is moved from the origin,
It is configured to include a determination means for determining whether or not the cloth pressing mechanism is moving and an information processing means for correcting the movement amount of the cloth pressing mechanism when the cloth pressing mechanism is moving.

[Operation] When the sewing machine starts running, the central processing unit reads the cloth feed data of the sewing pattern data and outputs the data to the feed pulse train generation circuit. The pulse train generation circuit outputs pulses corresponding to the cloth feed amount, drives the X and Y axis pulse motors, and moves the cloth pressing mechanism by a predetermined feed amount. When the work clamp mechanism moves, the area limit function works to make a correction calculation based on the movement of the work clamp mechanism from the origin to match the set area limit.

[Embodiment of the Invention] An embodiment of a control device for an automatic sewing machine according to the present invention will be described with reference to FIGS. 1 and 2. The hardware configuration is the same as the third and fourth configurations.

FIG. 1 is a structural diagram of a positional relationship between an origin and a physical limit for explaining the flowchart of the area limit A of FIG. 2 of the present invention, and FIG. 2 is an area limit subroutine for explaining the operation of the present invention. FIG.

Next, before explaining the operation of the flowchart of FIG. 2, the symbols shown in FIG. 2 will be described.

[POS], [± XLM], [± YLM], and [MOVE] have the same meanings as in the case of the above-described conventional apparatus, and therefore re-explanation is omitted. The same applies to the origin O ₀ and the reference point O ₁ .

[CHX] X-axis side movement distance from the origin O ₀ of the reference point O ₁ after movement, [CHY] is Y from the origin O ₀ of the reference point O ₁ after movement
This is the axial movement distance. In addition, [+ XCH] and [-XCH] are corrected values ([+ XLM]-[CHX]) after the correction calculation ([+ XLM]-[CHX]) limit values (moving limit distance), and [+ YCH] and [-YCH] are corrected. This is the limit value (moving limit distance) in the Y-axis positive and negative directions after calculation ([+ YLM]-[CHY].

In the apparatus of the present invention having the above-described structure, the cloth pressing mechanism (21) shown in FIG. 3 holds the article to be sewn and the sewing machine starts operating, as in the conventional apparatus described above. The pulse train generation circuit (9) outputs pulses corresponding to the cloth feed amount synchronized with the rotation of the sewing machine to the drivers (7) and (8), and the pulse motors (5) and (6) press the cloth presser mechanism ( 21) will move only the specified feed amount. Here, the subroutine shown in FIG. 2 is executed.

In the flowchart of FIG. 2, in step 1, the direction of the reference point O ₁ after the movement of the X-axis is determined. In step 2, it is determined whether or not the reference point O ₁ has moved from the origin O ₀ ,
If it has moved, the process proceeds to step 3, and if it has not moved, the conventional comparison is sufficient, so the process proceeds to step 7. In step 7, [-XLM] is compared with [MOVE], and [-XLM] ≥
If it is not [MOVE], that is, if the reference point O ₁ exceeds the X-axis negative direction limit value, proceed to step 15 and select [-XL
If M] ≧ [MOVE], that is, if the reference point O ₁ is within the range of the X-axis negative direction limit value, the process proceeds to step 8.

In step 8, the direction of the moved Y-axis reference point O ₁ is determined. If the direction is positive, the process proceeds to step 11, and if the direction is negative, the process proceeds to step 9. In step 9, it is determined whether or not the reference point O ₁ has moved from the origin O ₀ , and if it has moved, the process proceeds to step 10. If it has not moved, the conventional comparison is sufficient, so the process proceeds to step 14. In step 14, [-YLM] and [MOVE]
If [−YLM] ≧ [MOVE] is not satisfied, that is, if the reference point O ₁ exceeds the Y-axis negative direction limit value, proceed to step 15. If [−YLM] ≧ [MOVE], That is, when the reference point O ₁ is within the range of the Y-axis negative direction limit value,
The work clamp mechanism (21) judges that it is within the range of the area limit A, and completes the normal operation.

In step 3, since the reference point O ₁ has moved from the origin O ₀ , the X-axis negative direction limit value [-XCH] and [M
OVE] is compared, and if [−XCH] ≧ [MOVE] is not satisfied, that is, if the reference point O ₁ exceeds the X-axis negative direction limit value after correction calculation, the process proceeds to step 15 and [−XCH] ≧ [ MOV
E], that is, if the reference point O ₁ is within the range of the X-axis negative direction limit value after the correction calculation, the process proceeds to step 8. In step 4, it is determined whether or not the reference point O ₁ has moved from the origin O ₀ , and if it has moved, the process proceeds to step 6. If it has not moved, the conventional comparison is sufficient, so the process proceeds to step 5. In step 5, [+ XLM] and [MOVE] are compared and [+ XL
If M] ≧ [MOVE] is not satisfied, that is, if the reference point O ₁ exceeds the X-axis positive direction limit value, the process proceeds to step 15,
If [+ XLM] ≧ [MOVE], that is, if the reference point O ₁ is within the range of the X-axis positive direction limit value, the process proceeds to step 8.
In step 6, since the reference point O ₁ has moved from the origin O ₀ , the corrected X-axis positive limit value [+ XCH] and [M
OVE] is compared, and if [+ XCH] ≧ [MOVE], that is, if the reference point O ₁ exceeds the X-axis positive direction limit value after the correction calculation, proceed to step 15 and [+ XCH] ≧ [MOV
E], that is, when the reference point O ₁ is within the range of the X-axis positive direction limit value after the correction calculation, the process proceeds to step 8. In step 10, since the reference point O ₁ has moved from the origin O ₀ ,
Y-axis negative direction limit value after correction calculation [-YCH] and [MOV
E] is compared, and if [−YCH] ≧ [MOVE] is not satisfied, that is, if the reference point O ₁ exceeds the Y-axis negative direction limit value after the correction calculation, the process proceeds to step 15 and [−YCH] ≧ [ MOVE]
If so, that is, if the reference point O ₁ is within the range of the Y-axis negative direction limit value after the correction calculation, the work clamp mechanism (21) judges that it is within the range of the area limit A, and normal operation is performed. Complete.

Further, in step 11, it is determined whether or not the reference point O ₁ has moved from the origin O ₀ , and if it has moved, the process proceeds to step 13, and if it has not moved, the conventional comparison is possible, so the process proceeds to step 12. move on. In step 12, [+ YLM] and [MOVE]
If [+ YLM] ≧ [MOVE], that is, if the reference point O ₁ exceeds the Y-axis positive direction limit value, proceed to step 15. If [+ YLM] ≧ [MOVE], then the reference If point O ₁ is within the Y-axis positive limit,
The work clamp mechanism (21) judges that it is within the range of the area limit A, and completes the normal operation.

In step 13, since the reference point O ₁ has moved from the origin O ₀ , the Y-axis positive direction limit value after correction calculation [+ YCH] is compared with [MOVE], and if [+ YCH] ≧ [MOVE] ,
That is, when the reference point O ₁ exceeds the Y-axis positive direction limit value after the correction calculation, the process proceeds to step 15 and [+ YCH] ≧ [M
OVE], that is, when the reference point O ₁ is within the range of the Y-axis positive direction limit value after the correction calculation, the work clamp mechanism (21) judges that it is within the range of the area limit A and operates normally. To complete.

In step 15, since the range is beyond the set area limit A when coming to this point, the alarm circuit is activated to inform that the sewing machine is operating abnormally. And
Proceeding to step 16, processing such as stopping the sewing machine operation is performed.

In this case, the area limit after the correction calculation is unequally distributed around the X1-X1 axis and the Y1-Y1 axis and coincides with the preset area limit A. A1 indicated by a thin chain double-dashed line in FIG. 1 indicates a conventional equal distribution area limit which is not corrected.

Similarly, when the central processing unit (12) reads the next cloth feed data through the pattern data memory (17) and the cloth presser mechanism (21) moves and an interrupt signal is input, an area similar to the above is again displayed. Execution of the limit function subroutine is sequentially repeated. Then, the cloth presser mechanism (21) is two-dimensionally moved within the range of the area limit A while the movement range is regulated by the area limit function, and a sewing pattern is formed on the workpiece according to the stored data. Will be done.

In the above embodiments, the case where the area of the area limit function is a square centered on the origin has been described, but the present invention can also be applied to a case where the area is a circle centered on the origin. .

[Effects of the Invention] As described above, according to the present invention, when the cloth pressing mechanism is moving from the origin of the area limit, the area limit is not equally distributed around the origin, unlike the conventional case. It is configured to calculate and correct the amount of movement of the work clamp mechanism. As a result, the preset area limit is maintained as it is even after the movement, the cloth pressing mechanism is stably driven, and the stability and productivity in the sewing work can be expected to be improved.

[Brief description of drawings]

FIG. 1 is a positional relationship diagram between an area limit and a reference point according to an embodiment of the present invention, FIG. 2 is a flow chart diagram of the area limit for explaining the operation of the present invention, and FIG. 3 is a hardware configuration diagram of a prior art, FIG. 4 is a block diagram of the XY drive mechanism section of FIG. 3, FIG. 5 is a positional relationship diagram of the prior art area limit and reference point, and FIG. 6 is a flowchart of the area limit explaining the operation of the prior art. is there. In Fig. 1, A is the area limit, move is the movement amount of the (reference point) of the work clamp mechanism, CHX (x1) is the movement amount of the (reference point) of the work clamp mechanism in the X direction, and CHY (y1) is the cloth This is the amount of movement of the (reference point) of the presser mechanism in the Y direction. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A sewing pattern on a sandwiched sewing object which is two-dimensionally driven by XY driving means in accordance with preprogrammed data to position the sandwiched sewing object on a sewing surface while cooperating with a needle. In a control device for an automatic sewing machine, which comprises a cloth pressing mechanism for forming a sewing machine and a restricting means for performing an area limit function for restricting a movement range within an area set on the sewing surface of the cloth pressing mechanism, The area limit function determines the presence or absence of movement of the reference point of the presser foot mechanism, the information processing means for newly calculating the area limit considering the movement amount of the reference point of the presser foot mechanism, When the reference point has moved, a determination means for determining whether or not the movement is possible based on a new area limit considering the amount of movement of the reference point of the work clamp mechanism calculated by the information processing means is provided. Control apparatus for an automatic sewing machine, characterized in that.