JPH09324360A - Embroidering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embroidering machine capable of embroidering at high speeds and simultaneously avoiding a sudden embroidering speed change, capable of executing a stable embroidering operation and improved in operability by disposing a means for controlling the vertical movement of an embroidering needle on the basis of a set speed, etc. SOLUTION: This embroidering machine is provided with a seam data-memorizing means 10 for specifying positions for moving an embroidering target material in response to an executing embroidery shape, a means for vertically moving an embroidering needle at a commanded speed, a means 12 for dividing the seam data into n data blocks wherein the data are arranged as head data in the moving order, a means 13 for determining the minimum speeds of the vertical movements of the needle in response to data constituting the data blocks, and a means for correcting the minimum speed and subsequently setting the corrected minimum speed as a needle vertical movement speed corresponding to the head data, when the minimum speed is compared with the set speed of the block and is larger than the prescribed value, or setting the minimum speed as a needle vertical movement speed corresponding to the head data, when the minimum speed is not larger than the prescribed value, and subsequently controlling the vertical movement of the needle on the basis of the set speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery sewing machine.

[0002]

2. Description of the Related Art In an embroidery sewing machine, a cloth, which is an object to be embroidered, is fixed to an embroidery frame, and the embroidery frame is moved in X and Y directions to perform embroidery sewing. This movement of the embroidery frame must of course be performed when the needle is raised, and if the movement distance of the embroidery frame is long, there is a problem that the needle cannot move while the needle is raised. Normally, the vertical movement speed of the needle is set according to the maximum movement distance. However, with such a speed setting, even if the movement distance of the embroidery frame is short, the needle moves up and down at a low speed, so that there is a drawback that the embroidery time becomes long. Therefore, a proposal has been made in which the entire stitch data is divided into N stages according to the moving order and the moving distance to form a plurality of speed blocks for sewing. However, in the case of this configuration, if there is a seam having a large movement distance even at the first stitch, the entire block is affected by this and the operation is performed at a low speed, and there is a drawback that the speed of sewing cannot be sufficiently achieved. Therefore, further develop this,
In recent years, a proposal has been made in which the speed is set for each stitch in accordance with the moving distance, and the speed of needle vertical movement is controlled for each stitch. In the case of this configuration, since the speed control is performed for each stitch, the vertical movement speed of the needle that matches the moving distance of the stitch can be obtained.

[0003]

However, in the case of this configuration, when the change in the moving distance is large, the change in the vertical movement speed of the needle is large, and the actuator such as the motor cannot follow this. Also, by repeating sudden acceleration and deceleration, an excessive load is applied to the drive mechanism of the sewing machine,
There were problems such as adversely affecting durability.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. Means for moving a needle up and down to execute sewing and a position for the needle An embroidery sewing machine having means for moving an embroidery object, a means for storing stitch data for specifying a position to move the embroidery object according to an embroidery shape to be executed, and a command. And means for making the needle move up and down at different speeds, means for making the stitch data into N block data with each data being the leading data in the order of movement, and the block data. According to the data, the means for determining the minimum speed of the vertical movement speed of the needle is compared with this minimum speed and the set speed of the preceding block, and if there is a speed increase of a predetermined value or more, the minimum speed is set. Compensate for speed Then, the corrected minimum speed is obtained, and this corrected minimum speed is set as the speed of the needle up / down movement corresponding to the leading data. If there is no speed increase more than a predetermined value, the minimum speed is set to the needle up / down corresponding to the leading data. It is characterized by further comprising means for setting the speed of movement and means for controlling the means for moving the needle up and down based on the set speed. An embroidery object such as cloth is usually held by means for moving an embroidery frame or the like, and this embroidery frame is moved according to stitch data, and embroidery sewing is performed by a needle that moves up and down at a commanded speed. The stitch data is composed of data for specifying the position of the embroidery frame or the like. This data is set as the block data including up to N pieces of data in the sewing order with each data as the leading data. Then, the minimum speed is determined for each block data. This minimum speed V1 is set to the set speed V of the preceding block.
Compared with 0, when V1 is larger than V0 by a predetermined value or more, the acceleration is rapid, so correction is performed to avoid this.
Get the corrected minimum speed. Various correction methods are possible, such as subtracting a predetermined value from V1 or V0.
It is possible to add a predetermined value to When V1 is not larger than V0 by a predetermined value or more, the minimum speed V1 is set as the set speed. The means for controlling controls the means for moving the needle up and down based on this set speed. In the means for setting, it is preferable that the minimum speed is determined corresponding to the moving distance between the stitch data.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the sewing machine of the present invention includes a carriage 118, which is an XY moving mechanism 117, which will be described later, a embroidery frame 119 supported by the carriage 118, and a needle bar 120, which is a stitch forming mechanism 112, which will be described later, on the sewing machine frame X. Needle 121
And Then, attach a cloth to the embroidery frame 119,
Embroidery sewing is performed by moving the carriage 118 in the XY directions and vertically moving the needle bar 120 and the needle 121. This embroidery sewing can be selected by the sewing mode selection button 104. When the embroidery sewing is not performed, the normal sewing mode is set, and the needle bar 120 and the needle 121 described above are selected.
The normal sewing is performed by the vertical movement of the above and the cloth feeding by the feeding device (not shown).

FIG. 1 is a block diagram showing a hardware configuration, and this embodiment will be described in detail with reference to FIG. The CPU 100 controls the sewing machine according to the program stored in the program storage device 101, and drives the sewing machine motor drive circuit 110 at a speed instructed by a rotation speed command device 103 which is a speed controller such as a stepping type during normal sewing. The sewing machine motor 111 is controlled to rotate, and the stitch forming mechanism 1 is operated at a sewing speed according to the instructed speed.
12 is driven. At the time of embroidery sewing, the embroidery sewing is performed at the speed set by the program of the speed setting program storage device 13 described later. The stitch forming mechanism 112 has a needle bar 120 as shown in FIG.
The needle 121 and a cloth feeding mechanism (not shown) are used to execute a predetermined sewing. Sewing machine motor 1
The rotation speed of 11 is detected by the motor rotation detection sensor 113 and fed back to the CPU 100 to be used for speed control. The embroidery sewing machine has an XY motor drive circuit 11 in addition to the sewing machine motor drive circuit 110.
5, the XY motor 116 and the XY moving mechanism 117 are provided, and the pattern sewing is executed based on the pattern data from the stitch data storage device 10. As described above, the XY moving mechanism 117 is the carriage 11 shown in FIG.
8 and an embroidery frame 119, the cloth attached to the embroidery frame 119 is moved in the X-Y directions to execute embroidery sewing. The timing signal generator 114 is used to detect the vertical phase of the needle 121 by detecting the rotational phase of the upper shaft of the sewing machine main body, and to take the timing of the XY motor drive by the XY motor drive circuit 115. CPU
100 inputs the timing signal to control the XY motor drive circuit 115. The above-mentioned embroidery sewing and normal sewing are performed by operating the sewing mode selection button 104. This sewing mode selection button 104
Is provided at the front part of the sewing machine frame X as shown in FIG. A display device 106 is further provided on the front part, and various displays are performed by the display control device 105 in response to a command from the CPU 100, as shown in FIG. Reference numeral 11 is a temporary storage device.

The CPU 100 further includes a block program storage device 12, a speed setting program storage device 13, a moving distance / speed correspondence table 14, and a block number setting button 1.
5 are provided. FIG. 3 shows an example of stitch data stored in the stitch data storage device 10. In this example,
Relative coordinates Δx and Δy of X and Y are set for each address 0 to 30 (sewing order). Therefore, the coordinates directly represent the moving distance. Further, in the movement distance / speed correspondence table 14, the speed corresponding to the movement distance is preset as shown in FIG. The speed corresponding to the moving distance (relative coordinates) is set at each address. This speed is set according to the speed defined in the moving distance / speed correspondence table 14 in correspondence with the larger value of Δx and Δy. For example, at address 2, the amount of movement in the X direction is 3
Since the amount of movement in the Y direction is 2, the speed 400 in FIG. 4 corresponding to the amount of movement 3 is set.

A blocking program is stored in the blocking program storage device 12, and the CPU 100 divides the stitch data of the stitch data storage device 10 into blocks according to this program. This block formation may be all performed first, or may be performed according to the progress of sewing. Blocking is performed by setting each address as the head address and the addresses up to the Nth address as one block. For example, if N = 3,
As shown in FIG. 3, addresses 1 to 3 are blocks. Next, address 2 to address 4 are blocks, address 3
Blocking is performed such that from to address 5 is a block. Then, the minimum speed Vn for each block is determined according to the program of the speed setting program storage device 13, and this minimum speed Vn is set as the minimum speed of the head address of the block.

Looking at the block, the speeds of the respective addresses are 500, 400 and 300, and the minimum speed is 300, so the minimum speed of the address 1 is 300.
Looking at the block next, the speed of each address is 400, 30
Since it is 0,200, the minimum speed of address 2 is 200. Similarly, the minimum speed is determined thereafter.
Since there is no data N = 3 ahead at the addresses 29 and 30, in this case, the minimum speed of FIG. 4 (100 in this case)
Is set. The number of N can be set by the user with the block number setting button 15. By increasing the number of N, the embroidery speed is reduced but the safety can be increased.

FIG. 5 is a plot of the set speed shown in FIG. 3 in comparison with the speed for each address (conventional technology). The circle is a speed for each address according to the conventional technology, and the triangle is N = 3 and is divided into blocks. Indicates the set speed. As is clear from this graph, it is clear that the speed set by blocking has less rapid changes.

However, since the above-mentioned block formation still causes a rapid increase in speed, the minimum speed V1 is further reduced.
Is compared with the previous set speed V0, and if it is equal to or more than a predetermined value, V1 is corrected. In this embodiment, V1 is corrected by adding a predetermined value a to V0 of the previous block and setting V1 = V0 + a. Various correction methods other than such a method can be adopted, and a method such as subtracting a predetermined value from V1 or multiplying V0 and V1 by a predetermined coefficient is possible.
FIG. 3 shows correction speeds when the predetermined value is k = 80 and a = 40 and a = 70. For example, at address 1, the speed increases from 0 to 300, so V1-V0> k
(= 80), which is the correction target. And V0 + a =
The correction calculation of 0 + 40 is performed, and the correction speed 40 is obtained. This corrected speed becomes the set speed and is used to control the sewing machine motor drive circuit 110. The graph shown by the mark X and the dotted line in FIG. 5 is a graph of the correction speed, and it is clear that the sudden speed increase is moderated.

FIG. 6 shows a flow chart of the above-mentioned block formation and speed setting operation. First, the point of blocking is set to the head address (step S1), and it is confirmed whether or not there is data of N needle tips (step S2). In some cases,
The N-needle data is pre-read (step S3), and the speed corresponding to the maximum movement amount is determined as the minimum speed V1 among the data of the blocks up to the N-needle ahead (step S4). Then, the minimum speed V1 is set to the set speed V0 of the previous block.
(Step S5), it is determined whether V0-V1 ≧ k (step S6), and if k or less, the minimum speed V1 is set as the set speed of the head address of the block (step S6).
7). If k or more, a predetermined value a is added to the set speed V0 of the previous block, and this is set as the set speed (step S8).
Then, set points at the next address (step S
9) Return to step 2. In step 2, if there is no data for the N needle tip, the set speed is set to the minimum speed of the speeds in FIG. 4 (step S10), the point is set to the next address (step S11), and it is determined whether or not to end. Confirm (step S12). If not, the process returns to step 2.

In the above embodiment, when the deceleration is equal to or higher than the predetermined value, no particular correction is made.
When 1 ≧ k, the correction speed can be set by V0-a. However, in the case of deceleration, it is necessary to reach the minimum speed V1 from the viewpoint of safety, and it is desirable to achieve this within the range of the number of blocks N. That is, if N = 3, the set speed is set to V1 at the third stitch. Such a configuration can be implemented by including a brake device or the like.

As described above, in the above embodiment,
The speed of needle up / down movement is not determined for each stitch data, each stitch is taken as the head, data up to N stitch points is grasped as a block, and the speed corresponding to the maximum movement amount in the block is set as the minimum speed of the stitch. Further, when the speed increases significantly compared to the previous set speed, the correction is performed so as to suppress this, so that a rapid change in the speed can be prevented.
Therefore, a needle up-and-down mechanism using an ordinary motor can sufficiently cope with it, and the durability of the drive system is not adversely affected. Further, by providing the block number setting button 15, there is an effect that the tendency of the speed control of the needle can be arbitrarily set by the user.

[0016]

As described above, according to the embroidery sewing machine of the present invention, the needle vertical movement speed at each stitch is set to the minimum speed based on the block data, and if there is a further large speed increase, this is corrected. Therefore, it is possible to speed up the sewing and at the same time to avoid a rapid change in the speed, and there is an effect that a reasonably stable sewing can be executed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an external perspective view showing an embodiment of the present invention.

FIG. 3 is a data structure diagram according to an embodiment of the present invention.

FIG. 4 is a table of travel distance / speed in one embodiment of the present invention.

FIG. 5 is a graph of speed and set speed in FIG.

FIG. 6 is a flowchart diagram illustrating the operation of the embodiment of the present invention.

[Explanation of symbols]

1: sewing pattern data storage means, 2: pattern selection means, 3:
Size designation means, 4: Data selection means, 5: Size adjustment means, 6: Sewing machine motor drive control means, 7: Stitch forming means, 8: XY motor drive control means, 9: XY movement means, 10: Stitch data Storage device, 11: temporary storage device, 12: blocking program storage device, 13: speed setting program storage device, 14: moving distance / speed correspondence table, 15: block number setting button, 20: pattern selection button,
100: CPU, 101: program storage device, 10
3: rotation speed command device, 104: sewing mode selection button, 1
05: display control device, 106: display device, 110: sewing machine motor drive circuit, 111: sewing machine motor, 112: stitch forming mechanism, 113: motor rotation detection sensor, 114:
Timing signal generator, 115: XY motor drive circuit, 116: XY motor, 117: XY movement mechanism, 11
8: carriage, 119: embroidery frame, 120: needle bar, 12
1: Needle.

Claims (2)

[Claims] 1. An embroidery sewing machine including means for moving a needle up and down to execute sewing, and means for moving an embroidery object with respect to the needle position. Means for storing the stitch data for specifying the position to move the embroidery object, the means for moving the needle up and down at a commanded speed, and the order of moving the stitch data. And means for making N block data with each data as the leading data, means for deciding the minimum speed of the vertical movement speed of the needle in correspondence with the data constituting the block data, and this minimum speed And the set speed of the previous block are compared, and if there is a speed increase of a predetermined value or more, the minimum speed is corrected to obtain a corrected minimum speed, and this corrected minimum speed is set to the needle up / down corresponding to the leading data. Speed of movement If there is no speed increase above a predetermined value, a means for setting the minimum speed as the speed of needle up / down movement corresponding to the leading data, and the needle up / down movement based on the set speed. An embroidery sewing machine comprising: a means for controlling a means for performing a motion; 2. The embroidery sewing machine according to claim 1, wherein the setting means determines the minimum speed in accordance with a moving distance between stitch data.