JP3618407B2 - XY automatic feed stitching machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an XY-direction automatic feed sewing machine, and more particularly to an XY-direction automatic feed stitching machine such as a cycle sewing machine that automatically sews a workpiece in the XY direction according to sewing pattern data.
[0002]
[Prior art]
Conventionally, a so-called cycle sewing machine whose outline is shown in FIG. 5 is known. In this sewing machine, a cloth C to be sewn is sandwiched and held as shown in FIG. 7 by a cassette (sewing material holding device) 10 comprising upper and lower plates that can be opened and closed with a hinge 12 as a fulcrum as shown in FIG. After that, the cassette 10 is positioned at a predetermined position with respect to the needle drop position 16 of the sewing head 14, and then the cassette 10 is moved while controlling the position in the X and Y directions of the sewing table according to the sewing data. A predetermined sewing pattern is formed by sewing the cloth C along the groove 18 formed according to the sewing pattern in FIG.
[0003]
In the sewing machine, the positioning and fixing of the cassette 10 with the cloth C interposed therebetween is performed by the chuck base 20. That is, a pair of chucks 22 formed on the handle portion of the cassette 10 is disposed inside the two claw portions 24 formed on the chuck base 20 corresponding to the chucks 22 as shown in FIG. Thereafter, one of the claw portions 24 is attracted in the direction of the chuck 22 by the air cylinder 26, and the both chucks 22 and both the claw portions 24 are engaged with each other, so that the cassette 10 is accurately positioned at a predetermined position with respect to the sewing machine. It can be set.
[0004]
As described above, the cassette 10 set on the chuck base 20 can be moved forward and backward in the X direction by the X movement base 28 and in the Y direction by the Y movement base 30.
[0005]
That is, as shown in FIG. 9 (the cassette 10 is omitted), the chuck base 20 is fixed to a part of the timing belt 32 constituting the X movement base 28, and the timing bells 32 are disposed at both ends. Since it is stretched by a gear, when one of the gears is rotated by a pulse motor (not shown), it moves accurately in the X direction.
[0006]
Further, the X movement base 28 on which the timing belt 32 is installed is a pair of left and right rack and pinion mechanisms (not shown) that constitute the Y movement base 30 disposed in the vicinity of both left and right ends in the X direction of FIG. ), By applying a rotational force to one pinion (small gear) by a pulse motor (not shown), the pin base can be accurately moved in the Y direction, and the chuck base 20 is also moved in the Y direction accordingly. It is supposed to be.
[0007]
In the above conventional cycle sewing machine, a sewing pattern inputted in advance is stored as coordinate data in a storage medium such as a floppy disk, and the sewing operation is performed based on the sewing data. The speed is determined based on the stitch length obtained by calculating the stitch length (the amount of movement of the workpiece) from the sewing data.
[0008]
That is, if the sewing data is stored in the storage medium as the coordinates of the needle entry position of the structure (X1, Y1), (X2, Y2), (X3, Y3), (X4, Y4), The length Pn is calculated by the following equation (1).
[0009]
Pn = {(X2-X1) ² + (Y2-Y1) ² } ^1/2 (1)
[0010]
The stitch length calculated in this way is limited to the sewing speed for each stitch length range as shown in FIG. 10, for example, and the stitch length Pn is 3 mm. Then, the sewing speed was determined as 1800 spm (stitch per minute) in a unified manner.
[0011]
[Problems to be solved by the invention]
However, in the conventional cycle sewing machine described above, in order to move the cassette 10 holding the cloth C to be sewn in the X direction, the chuck base 20 to which the cassette 10 is attached is moved to the timing belt 32 of the X movement base 28. However, in order to move the cassette 10 in the Y direction, the entire X moving base 28 including the timing belt 32 to which the chuck base 20 is fixed must be moved. Because the load is applied to the movement in the Y direction rather than the direction, the sewing speed is centrally determined from the stitch length obtained by calculation from the sewing pattern data as described above, despite the difference in the cloth feeding ability depending on the direction. Therefore, there was a problem that the cloth feeding performance was not fully exhibited.
[0012]
The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide an XY-direction automatic feed stitching machine capable of sufficiently exhibiting the cloth feed performance.
[0013]
[Means for Solving the Problems]
The present invention relates to a sewing product holding means for holding a sewing product on a sewing table, an X direction moving means and a Y direction moving means for moving the sewing product holding means in the X direction and the Y direction, and sewing data. The X direction moving means and the Y direction moving means are driven to control the position control means for moving the sewing product to a predetermined stitch position, and the X direction target movement amount and the Y direction movement distance are determined from the sewing data for each stitch. means for determining a target amount of movement, respectively, in the XY direction automatic feed sewing machine provided with a, for each stitch, a target amount of movement of the X-direction, a sewing speed to be constrained to the mechanical performance of the X-direction moving means The sewing speed in the Y direction is calculated from the relationship between the means for obtaining the sewing speed in the X direction from the relationship of the above, the target movement amount in the Y direction for each stitch, and the sewing speed restricted by the mechanical performance of the Y direction moving means. means for determining the appropriate one stitch Select slower ones of sewing speed and Y direction to a sewing speed of the X-direction that has been determined for the seam, by providing a sewing speed setting means for setting as an actual sewing speed for sewing th The problem is solved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, for each stitch, a target movement amount in each of the X direction and the Y direction is obtained from the sewing data, and a sewing speed is obtained for each direction based on the target movement amount. Since the smaller one is selected and set as the target sewing speed for the corresponding stitch, the maximum sewing speed set according to the movement performance in each direction is determined for each of the X and Y directions. In addition, since the lower one of the two speeds is selected and set as the actual sewing speed, the target stitch can be reliably moved to the needle drop position before the needle drop.
[0015]
Therefore, since the sewing speed can be optimized in view of the mechanical performance of each feed mechanism in the X direction and Y direction that the sewing machine has, the movement performance in each of the X direction and Y direction is 100% depending on the sewing conditions. Therefore, it is possible to perform sewing according to an accurate sewing pattern, and the sewing speed is improved, so that productivity can be improved.
[0016]
Hereinafter, more specific embodiments will be described in detail with reference to the drawings.
[0017]
FIG. 1 is a block diagram showing a schematic configuration of speed setting means provided in a cycle sewing machine (XY-direction automatic feed stitching machine) according to an embodiment of the present invention. The cycle sewing machine of this embodiment has substantially the same basic configuration and function as those described with reference to FIG. 5 except for the speed setting means described in detail below.
[0018]
The speed setting means 1 provided in the cycle sewing machine of the present embodiment includes a CPU (central processing unit) 2 constituting a main control device for performing drive control of the entire sewing machine, and a plurality of stitch patterns previously formed on the stitch pattern. Coordinate data representing the needle entry position (XN, YN) is stored, for example, an external storage device 3 comprising a ROM, a floppy disk drive or the like, and calculation processing such as determination and selection of sewing speeds in both XY directions, which will be described in detail later And an arithmetic unit 4 for performing
[0019]
The smaller sewing speed selected by the speed setting means 1 through the processing described later is input as a target sewing speed to the motor driver 6 via the I / O port 5, and the motor driver 6 receives the input signal. Based on the above, the spindle motor 7 is controlled to reach the target sewing speed.
[0020]
The arithmetic unit 4 can be configured by software stored in a ROM or an external storage device. The calculation unit 4 has a data table shown in FIGS. 2 and 3 showing the relationship between the stitch length restricted by the mechanical performance and the sewing speed in each of the X direction and the Y direction.
[0021]
The Y-direction data table in FIG. 2 is the same as the conventional data table shown in FIG. 10, but the X-direction data shown in FIG. 3 is moved in the X direction as described with reference to FIG. Is light because only the cassette 10 and the chuck base 20 need to be moved. Therefore, since the high-speed operation is possible compared with the Y direction, the stitch length is set to be long.
[0022]
Next, the operation of the present embodiment will be described with reference to the flowchart of FIG.
[0023]
First, the sewing data (XN, YN) consisting of the coordinate values of the needle entry position from the external storage device 3 are sequentially read (step S1), and the feed amounts Xp, Yp in the X direction and Y direction are calculated for the target stitch. (Step S2).
[0024]
Next, based on the calculated stitch length Yp in the Y direction, the sewing speed YS in the moving direction is determined from the table of FIG. 2 (step S3), and similarly, based on the stitch length Xp in the X direction, The sewing speed XS in the X direction is determined from the table of FIG. 3 (step S4).
[0025]
Thereafter, the determined sewing speeds XS and YS in both directions are compared (step S5), the slower one is selected as the actual sewing speed (step S6), and this is output to the I / O port 5 as the target sewing speed. (Step S7). Although the routine ends in steps S1 to S7, the above routine is repeated as long as there is sewing data.
[0026]
Through the above processing, the target sewing speed data output from the CPU 2 to the I / O port 5 is read by the motor driver 6 and the spindle motor 7 is driven and controlled to rotate the spindle at a speed corresponding to the target sewing speed. To do.
[0027]
Here, in order to clarify the effect of the present invention, it will be described in comparison with the conventional case. In the conventional control device, as described above, the sewing speed is determined from the stitch length calculated by the equation (1), and the difference in the feed speeds in the X and Y directions due to the mechanism is taken into consideration. Therefore, even if there is a difference in the feeding performance of the X axis and the Y axis as shown in FIGS. 2 and 3, the load in the X direction and the Y direction is different. Since the sewing speed is 3 mm even in the feed (for example, when the X axis is 3 mm and the Y axis is 0 mm), the sewing speed is determined to be 1800 spm according to the contents of the stitch length-sewing speed table in FIG. .
[0028]
On the other hand, according to the present embodiment, if the feed amount in the X direction is 3 mm, the mechanical performance is 2000 spm from the table of FIG. Become. Therefore, conventionally, the feed performance in the X direction and the Y direction was limited by the performance in the axial direction on the side where the performance is inferior, but according to this embodiment, it is possible to demonstrate the original performance 100%. It becomes.
[0029]
Further, since the cassette used in the sewing machine shown in FIG. 5 is usually long in the X direction, for example, the length in the Y direction is 240 mm and the length in the X direction is 900 mm, the movement in the same direction can be fast. Reasonable sewing operation is possible in terms of mechanism.
[0030]
Although the present invention has been specifically described above, the present invention is not limited to that shown in the above embodiment, and various modifications can be made without departing from the scope of the invention.
[0031]
For example, the sewing speed data table used to determine the sewing speed is not limited to the one shown in FIGS. 2 and 3, and may be obtained by calculation using a conversion function instead of the table.
[0032]
In addition, the specific configuration of the sewing machine is not limited to the cycle sewing machine shown in the above embodiment, and any sewing machine may be used as long as the sewing is performed while the workpiece is fed in each of the X direction and the Y direction. .
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to perform sewing that sufficiently exhibits the cloth feeding performance.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a sewing speed setting means provided in a cycle sewing machine according to an embodiment. FIG. 2 is a chart showing a relationship between stitch length in the Y direction and sewing speed of the sewing speed setting means. FIG. 3 is a chart showing the relationship between the stitch length in the X direction and the sewing speed of the sewing speed setting means. FIG. 4 is a flowchart showing the operation of the embodiment. FIG. 5 is a schematic oblique view showing the appearance of the cycle sewing machine. 6 is a perspective view showing a cassette for setting a sewing product on the cycle sewing machine. FIG. 7 is a perspective view showing a state in which the sewing product is clamped by the cassette. FIG. FIG. 9 is an explanatory diagram showing the relationship between the chuck base to be fixed and FIG. 9 is an explanatory diagram showing the relationship between the chuck base and the timing belt. FIG. 10 is a diagram showing the relationship between the sewing length and the sewing speed used in the conventional sewing speed setting. Chart DESCRIPTION OF SYMBOLS
1 ... Speed setting means 2 ... CPU
DESCRIPTION OF SYMBOLS 3 ... External storage device 4 ... Operation part 5 ... I / O port 6 ... Motor driver 7 ... Spindle motor 10 ... Cassette 12 ... Hinge 14 ... Sewing head 16 ... Needle drop position 18 ... Groove 20 ... Chuck base 22 ... Chuck 24 ... Claw part 26 ... Air cylinder 28 ... X movement base 30 ... Y movement base 32 ... Timing belt

Claims (1)

Sewing object holding means for holding the sewing object on the sewing table, X direction moving means and Y direction moving means for moving the sewing object holding means in the X direction and Y direction, respectively, and movement in the X direction according to the sewing data Position control means for driving and controlling the sewing means and the Y-direction moving means, and the X-direction target movement amount and the Y-direction target movement amount from the sewing data for each stitch. In an XY-direction automatic feed stitching machine comprising:
Means for determining the sewing speed in the X direction from the relationship between the target movement amount in the X direction and the sewing speed restricted by the mechanical performance of the X direction moving means for each stitch;
Means for obtaining the sewing speed in the Y direction from the relationship between the target movement amount in the Y direction and the sewing speed restricted by the mechanical performance of the Y direction moving means for each stitch;
Select slower ones of sewing speed and Y direction to a sewing speed of the determined terms appropriate one stitch each stitch the X direction, the sewing speed setting means for setting as an actual sewing speed for sewing th XY-direction automatic feed stitching machine characterized by comprising

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