JP3670399B2 - Embroidery sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an embroidery sewing machine.
[0002]
[Prior art]
In an embroidery sewing machine, a cloth or the like as an embroidery object is fixed to an embroidery frame, and the embroidery frame is moved in the XY directions to perform embroidery sewing.
Naturally, the movement of the embroidery frame must be performed when the needle is raised upward. If the movement distance of the embroidery frame is long, there is a problem that the needle cannot move while the needle is raised upward. Normally, the vertical movement speed of the needle is set according to the maximum movement distance.
However, with such a speed setting, even when the moving distance of the embroidery frame is short, the vertical movement of the needle becomes a low speed, and there is a disadvantage that the embroidery time becomes long. For this reason, it has been proposed to sew by forming a plurality of speed blocks by dividing the entire stitch data into N stages according to the movement order and the movement distance. However, in the case of this configuration, if there is a seam having a large moving distance even with one stitch, there is a drawback that the entire block is affected by this and the operation is performed at a low speed, so that the sewing speed cannot be sufficiently increased.
For this reason, in recent years, proposals have been made to further develop this and set the speed according to the movement distance for each stitch and control the speed of needle up-and-down movement for each stitch.
In the case of this configuration, speed control is performed for each stitch, so that the vertical movement speed of the needle adapted to the movement distance of the stitch can be obtained.
[0003]
[Problems to be solved by the invention]
However, in the case of this configuration, if the change in the movement distance is large, the change in the vertical movement speed of the needle becomes large, causing a problem that an actuator such as a motor cannot follow this.
In addition, repeated rapid acceleration and rapid deceleration put an excessive burden on the drive mechanism of the sewing machine and have a problem of adversely affecting durability.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve the above-described conventional problems, and includes means for moving a needle up and down to perform sewing, and means for moving an embroidery object with respect to the needle position. An embroidery sewing machine provided with means for storing stitch data for specifying a position to move the embroidery object in accordance with the embroidery shape to be executed, and for moving the needle up and down at a commanded speed Means for performing, and means for making the stitch data into N pieces of block data with each data as leading data in the order of movement;
Corresponding to the data constituting the block data, the means for determining the minimum speed of the vertical movement speed of the needle is compared with the set speed of the immediately preceding block, and there is a speed increase of a predetermined value or more. In this case, a predetermined value is added to the set speed of the immediately preceding block to obtain a corrected minimum speed, and this corrected minimum speed is set as the speed of the needle up-and-down movement corresponding to the head data. If not, to control means for setting the minimum speed as the needle up-and-down movement speed corresponding to the head data, and means for causing the needle to move up and down based on the set speed And means.
An embroidery object such as a cloth is normally held by means for moving the embroidery frame or the like, and the embroidery frame is moved according to the stitch data, and embroidery sewing is performed by a needle that moves up and down at a commanded speed. The stitch data includes data for specifying the position of the embroidery frame and the like. This data is assumed to be block data including data up to N pieces in the order of sewing, with each data as the head data. Then, the minimum speed is determined for each block data. This minimum speed V1 is compared with the set speed V0 of the immediately preceding block, and when V1 is larger than V0 by a predetermined value or more, since it is a sudden acceleration, correction is performed to avoid this, and a corrected minimum speed is obtained. Various correction methods are possible, such as subtracting a predetermined value from V1, or adding a predetermined value to V0.
When V1 is not larger than V0 by a predetermined value or more, this 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 the set speed.
In the setting means, it is preferable that the minimum speed is determined in accordance with a moving distance between the stitch data.
[0005]
DETAILED DESCRIPTION OF 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 has a carriage 118 as an XY movement mechanism 117 described later on a sewing machine frame X, an embroidery frame 119 supported by the carriage 118, and a needle bar 120 as a stitch formation mechanism 112 described later. Needle 121.
A cloth is attached to the embroidery frame 119, and embroidery sewing is performed by moving the carriage 118 in the X and Y directions and moving the needle bar 120 and the needle 121 up and down. The embroidery sewing can be selected by a 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 are moved up and down and a feeding device (not shown). Normal sewing is executed by the cloth feed.
[0006]
FIG. 1 is a block diagram showing a hardware configuration, and this embodiment will be further described in detail in conjunction with FIG.
The CPU 100 controls the sewing machine in accordance with a program stored in the program storage device 101. During normal sewing, the CPU 100 drives the sewing machine motor drive circuit 110 at a speed instructed by a rotational speed command device 103 which is a stepping type speed controller. The sewing machine motor 111 is controlled to rotate, and the stitch formation mechanism 112 is driven at a sewing speed corresponding to the designated speed. At the time of embroidery sewing, embroidery sewing is performed at a speed set by a program of a speed setting program storage device 13 described later.
As shown in FIG. 2, the stitch formation mechanism 112 includes a needle bar 120, a needle 121, and a cloth feed mechanism (not shown), and executes predetermined sewing. The number of rotations of the sewing machine motor 111 is detected by a motor rotation detection sensor 113 and fed back to the CPU 100 to be used for speed control.
The embroidery sewing machine is provided with an XY motor driving circuit 115, an XY motor 116, and an XY moving mechanism 117 in addition to the sewing machine motor driving circuit 110, and executes pattern sewing based on the pattern data from the stitch data storage device 10. It has become. As described above, the XY movement mechanism 117 includes the carriage 118 and the embroidery frame 119 shown in FIG. 2, and the cloth attached to the embroidery frame 119 is moved in the XY direction to execute embroidery sewing. .
The timing signal generator 114 is used for detecting the rotational phase of the upper shaft of the sewing machine body, detecting the vertical movement of the needle 121, and taking the timing of driving in the X and Y directions by the XY motor driving circuit 115. The CPU 100 inputs the timing signal and controls the XY motor driving circuit 115.
The above-described embroidery sewing and normal sewing are performed by operating the sewing mode selection button 104. The sewing mode selection button 104 is provided on the front portion of the sewing machine frame X as shown in FIG.
A display device 106 is further provided on the front portion, and various displays are performed by the display control device 105 in accordance with commands from the CPU 100 as shown in FIG.
Reference numeral 11 denotes a temporary storage device.
[0007]
The CPU 100 is further provided with 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 15.
An example of the stitch data stored in the stitch data storage device 10 is shown in FIG. In this example, X and Y relative coordinates Δx and Δy are set for each address from 0 to 30 (sewing order). Therefore, the coordinates directly represent the moving distance.
In the movement distance / speed correspondence table 14, a speed corresponding to the movement distance is set in advance as shown in FIG.
A speed corresponding to the moving distance (relative coordinates) is set at each address. This speed is set according to the speed defined in the movement distance / speed correspondence table 14 corresponding to the larger value of Δx and Δy. For example, at the address 2, the movement amount in the X direction is 3 and the movement amount in the Y direction is 2, so the speed 400 of FIG. 4 corresponding to the movement amount 3 is set.
[0008]
The blocking program storage device 12 stores a blocking program, and the CPU 100 blocks the stitch data in the stitch data storage device 10 in accordance with this program. All of the blocking may be performed first, or may be performed according to the progress of sewing.
Blocking is performed by setting each address as a head address and addresses up to N addresses as one block. For example, when N = 3, as shown in FIG. 3, the blocks from address 1 to address 3 are the block (1). Next, blocks 2 to 4 are made into blocks (2) and blocks 3 to 5 are made into blocks (3).
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 at the head address of the block.
[0009]
Now, looking at block {circle around (1)}, the speed of each address is 500, 400, 300, and the minimum of these is 300, so the minimum speed of address 1 is 300.
Next, in block (2), the speed of each address is 400, 300, and 200, so the minimum speed of address 2 is 200. Similarly, the minimum speed is determined.
Since there is no data of N = 3 ahead at addresses 29 and 30, in this case, the minimum speed (100 in this case) in FIG. 4 is set.
Note that 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 decreased, but the safety can be increased.
[0010]
FIG. 5 is a plot of the set speed of FIG. 3 in comparison with the speed for each address (prior art), where ◯ is the speed for each address according to the prior art, and Δ is the speed set in a block with N = 3. Represents.
As is clear from this graph, it is clear that the speed set by the blocking is less suddenly changed.
[0011]
However, a sudden speed increase still remains even after the above-described blocking, so that the minimum speed V1 is further compared with the previous set speed V0, and if it is greater than or equal to a predetermined value, V1 is corrected. ing. In this embodiment, the correction of V1 is executed by adding a predetermined value a to V0 of the previous block so that V1 = V0 + a. In addition to such a method, various correction methods can be adopted, and a method of subtracting a predetermined value from V1, or a method of multiplying V0 or V1 by a predetermined coefficient is possible.
FIG. 3 shows the correction speed when the predetermined value is k = 80 and a = 40 and a = 70.
For example, in the address 1, since the speed is increased from 0 to 300, V1−V0> k (= 80), which is a correction target. Then, a correction calculation of V0 + a = 0 + 40 is performed, and a correction speed 40 is obtained. This correction speed becomes a set speed and is used for control of the sewing machine motor drive circuit 110. A graph indicated by a cross and a dotted line in FIG. 5 is a graph of the correction speed, and it is clear that a sudden speed increase is alleviated.
[0012]
FIG. 6 shows a flowchart of the operation of blocking and speed setting.
First, a blocking point is set at the head address (step S1), and it is confirmed whether there is data for N stitch points (step S2). If there is, the N stitch data is prefetched (step S3), and the speed corresponding to the maximum movement amount is determined as the minimum speed V1 in the block data up to the N stitches (step S4). Then, this minimum speed V1 is compared with the set speed V0 of the previous block (step S5), and it is determined whether or not V0−V1 ≧ k (step S6). It is set as the set speed of the head address (step S7). If it is greater than or equal to k, a predetermined value a is added to the set speed V0 of the previous block, which is set as the set speed (step S8). Then, a point is set at the next address (step S9), and the process returns to step 2.
In step 2, if there is no data for the N stitch point, the set speed is set to the lowest speed shown in FIG. 4 (step S10), a point is set at the next address (step S11), and whether or not the process is completed. Confirm (step S12). If not, return to Step 2.
[0014]
In the above embodiment, correction is not particularly performed when the deceleration is equal to or greater than a predetermined value. Similarly, when V0−V1 ≧ 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 N blocks. That is, if N = 3, the setting speed is set to V1 for the third stitch. Such a configuration can be executed by providing a brake device or the like.
[0015]
As described above, in the above embodiment, the speed of needle up-and-down movement is not determined for each stitch data, and each stitch data is grasped as a block up to N stitch point data, and the maximum movement amount in the block is determined. Since the corresponding speed is set as the minimum speed of the seam, and when the speed is greatly increased compared to the previous set speed, correction is performed so as to suppress this, so that a rapid change in speed can be prevented. For this reason, a needle up-and-down mechanism using a normal motor can be adequately handled, and the durability of the drive system is hardly adversely affected.
Further, by providing the block number setting button 15, there is an effect that the user can arbitrarily set the tendency of the needle speed control.
[0016]
【The invention's effect】
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 on the basis of the block data, and when there is a larger speed increase , the setting speed of the immediately preceding block is set. Since a corrected minimum speed obtained by adding a predetermined value is obtained , it is possible to increase the sewing speed and to avoid a sudden speed change and to perform a stable sewing without difficulty.
[Brief description of the 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 moving distance / speed according to an embodiment of the present invention.
FIG. 5 is a graph of the speed and the set speed in FIG.
FIG. 6 is a flowchart for explaining the operation of one 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 formation means, 8: XY motor drive control means, 9: XY movement means, 10: stitch data storage device, 11: temporary storage device, 12: block program storage device, 13: speed setting program storage device, 14: movement distance / speed correspondence table, 15: Block number setting button, 20: Pattern selection button, 100: CPU, 101: Program storage device, 103: Rotational speed command device, 104: Sewing mode selection button, 105: Display control device, 106: Display device, 110: Sewing machine motor drive circuit, 111: sewing machine motor, 112: stitch formation mechanism, 113: motor rotation detection sensor, 114: timing signal generator 115: XY motor driving circuit, 116: XY motor, 117: XY moving mechanism, 118: Carriage, 119: embroidery frame, 120: needle bar, 121: needle.

Claims (2)

An embroidery sewing machine comprising means for performing sewing by moving a needle up and down, and means for moving an embroidery object relative to the needle position,
Means for storing stitch data for specifying a position to move the embroidery object in accordance with an embroidery shape to be executed;
Means for causing the needle to move up and down at a commanded speed;
Means for making the stitch data into N block data having each data as the head data in the order of movement;
Means for determining a minimum speed of the vertical movement speed of the needle in correspondence with the data constituting the block data;
This minimum speed is compared with the set speed of the immediately preceding block, and if there is a speed increase that exceeds a predetermined value , a corrected minimum speed is obtained by adding a predetermined value to the set speed of the immediately preceding block , and this corrected minimum Means for setting the speed as the needle up-and-down movement speed corresponding to the head data, and when there is no speed increase above a predetermined value, the minimum speed is set as the needle up-and-down movement speed corresponding to the head data; ,
Means for controlling means for causing the needle to move up and down based on the set speed;
An embroidery sewing machine characterized by comprising The means for setting determines the minimum speed corresponding to the movement distance between each stitch data;
The embroidery sewing machine according to claim 1.

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