JPH0330794A - Sewing stitch data preparing device - Google Patents

Abstract

PURPOSE:To form automatically the stitch form of back stitch with a simple method by joining sequentially or reversely extracted data, the reversed data and needle drop data to prepare back stitch data by the predetermined number of needles. CONSTITUTION:Sewing pitches, the number of back stitch needles, sewing starting point and sewing completing point are inputted by using a key board 2, digitalizer 3 and X-Y plotter 4. The total stitch length Lt from a back stitch point Pb to a final stitch point Pe is divided by a sewing pitch Pt to calculate the total number Rt of needles. Needle drop data, and back stitch data of sewing start are formed. The back stitch data copies or extracts data corresponding to leading R needles of the formed needle drop data to reverse the symbol of data corresponding to the R needles. Similarly, the leading R needles of needle drop data are copied to joint these data continuously. Similarly, the back stitch data of final sewing can be formed. That is, R needles at the rear end of the data are copied to form the reversed data of the copied data and join these data in the order opposite to the back stitch data of sewing start. A yarn cutting command is inputted to prepare a series of stitch forming command.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sewing machine stitch data creation device, more specifically,
This invention relates to a sewing machine stitch data creation device that can automatically create stitch data for reverse stitching to prevent fraying of sewing thread at the beginning or end of sewing.

[Prior Art] Normally, when sewing is performed using an automatic sewing machine, the sewing machine's programming device determines the sewing start point and sewing end point, and the total stitch length is divided by the sewing pitch. Eye formation commands (data) have been obtained. In accordance with the stitch formation commands obtained in this way, the needle of the sewing machine and the holder of the workpiece are moved to form stitches and perform sewing. When sewing with a sewing machine, the sewing thread tends to fray at the beginning or end of sewing, so to prevent this, reverse stitching (a process of repeatedly sewing the same place) is provided at the beginning or end of sewing.

Conventionally, when obtaining stitch data for reverse stitching, reverse stitch data is obtained by determining and inputting stitch positions point by point, that is, stitch by stitch.

[Problems to be Solved by the Invention] When obtaining reverse stitch data using the method described above, the needle drop point at each reverse stitch must be the same, so the needle drop point is the same as the previous needle drop point. will be entered. Normally, this work is difficult, so the positional relationship is expanded and inputted with respect to the target count to improve the positional accuracy of the needle drop point. However, this work also requires extremely long working time and difficult labor, which has been an obstacle to improving the efficiency of sewing machine sewing.

Therefore, the present invention has been made to solve such problems, and an object of the present invention is to provide a sewing machine stitch data creation device that can automatically generate the stitch format of reverse stitching using a simple method. The task is to

[Means for Solving the Problems] In order to solve such problems, the present invention provides means for generating needle drop data from a sewing start point to a sewing end point, and a means for generating needle drop data from the beginning or end of the needle drop data. Means for extracting data of a predetermined number of needle bones from the rear end and means for generating inverted data of the extracted data are provided, and the extracted data, its inverted data, and needle drop data are successively displayed in order or in reverse. We adopted a configuration that creates backstitch data for a predetermined number of stitches.

[Operation] According to this configuration, a predetermined number of data is extracted or copied from the beginning or end of the needle drop data from the sewing start point to the sewing end point, and then the inverted data of this data is created. be done. By continuing this extracted data, its inverted data, and the cut-off data in order or in reverse, a stitch formation command can be created at a coordinate position for a predetermined number of stitches from the sewing start point, and the stitches for reverse stitching will be automatically created. format can be generated.

[Example] Hereinafter, the present invention will be described in detail according to an example shown in the drawings.

1 and 2 illustrate the configuration of a sewing machine stitch data creation device according to an embodiment of the present invention. In the figure, the reference numeral 1 indicates the main body of the computer, and the input means of the computer 1 include a keyboard 2,
A digitizer 3 and an XY block 4 are shown. Further, connected to the computer 1 are a CRT for displaying input and output, and a floppy disk driver 6 as an external storage device.

As shown in FIG. 2, the main body of the computer 1 includes a RAM II for storing data, a ROM 12 for storing programs, and a CPU 10 for controlling the entire system.
The computer 1 and its external storage device 6 or input/output devices 2 to 5 are connected via interfaces 13 to 17, respectively.

In such a configuration, steps 81 to S4 in FIG.
As shown in the figure, the sewing pitch, the number of reverse stitches, the sewing start point, and the sewing end point are input using the input devices 2 to 4, respectively. This is the sewing starting point P as shown in Figure 5.
b (PO) and the sewing end point Pe are specified, and the sewing pitch pt is inputted.The number of reverse stitches is 3 in the example of FIG. 5 because the reverse stitch is performed at P3.

In this way, from the sewing back point pb to the sewing end point Pe (step S5). In this manner, in FIG. 5, the coordinate position of each needle drop point is determined by setting the coordinates of the sewing start point to (0, O) and the coordinates of the sewing end point to (0, 33).

Subsequently, in step S6, off-balance data is generated. As shown in the center of FIG. 5, this needle drop data is data in which the coordinates of the left stitch are expressed as relative movement amounts with respect to the previous needle drop point. The actual data format is shown in Figure 6 (
As shown in A) and (B), it consists of 1 byte of data 20 indicating the amount of relative movement in the X direction and 1 byte of data 21 indicating the amount of relative movement in the Y direction, each of which is 7
The data format is such that the first bit indicates the direction of movement, and the remaining seven bits indicate the relative amount of movement.

Subsequently, in step S7, reverse stitch data at the beginning of sewing is generated. This is illustrated as a separate flowchart in FIG. That is, the reverse stitch data is the data DO of the leading R total (3 stitches in the embodiment) of the total missing data generated in step S6 of FIG. 3, as shown in step T1.
Copy or extract. Subsequently, in step T2, the sign of the data for the R needle described above is inverted. This state is also illustrated by data D2 in the figure. Then step T
In step 3, the first R stitches of the needle drop data are copied in the same way as in step TI. This state is also illustrated by data D3 in FIG. continue.

These data are made continuous in step T4. A method of making this data continuous is illustrated in FIG. 7, where the data corresponding to the reverse stitching section R (from PO to P3) is data
o, data generated from steps T1 to T2 are illustrated as D2, and data generated in step T3 is illustrated as data D3 (see also FIG. 5).

This means that the data pointer DP does not point to the data Do area first as shown in A1, but instead points to the data D3 as shown in A2, and sequentially moves the data to D3,
This can be achieved by calling D2 in this order and then bringing it to data Do (this can be achieved by , reverse stitch again and the data from P3 to PO is changed to P6 to Pe by D2.
The data up to this point can be obtained from the data Do to data n.

In addition, in the embodiment described above, in step T3, again,
The first R stitches of the meter loss data are copied, but since they are the same as the data extracted in step TI, this may be stored in memory and used. In this case, naturally the process of step T3 can be omitted.

Further, in the above-described embodiment, the reverse stitch data at the beginning of sewing is generated, but it is also possible to generate reverse stitch data at the end of sewing in step S8 in FIG.
(This is illustrated as data n, n', n''' in FIGS. 5 and 7). That is, the trailing R needle of the data is copied, and the inverted data of this copied data is generated. These are created by successively reading them in the reverse order of the reverse stitch data at the beginning of sewing.Subsequently, in step S9, a thread trimming command is input to create a series of stitch formation commands.

In addition, although the above-mentioned embodiment was a seam formation command for sewing along a straight line, the present invention is not limited to sewing along a straight line, and FIGS. As shown in B), along the curve, the coordinate position of the data is of course not fixed in the X coordinate as shown in Fig. 5, but in which the relative movement of each of the X and Y coordinates changes. In addition, by appropriately determining the sewing pitch based on the radius of curvature of the line, a predetermined stitch formation command can be created.

[Effects of the Invention] As explained above, according to the present invention, by making the data for a predetermined number of stitches from the beginning of the needle drop data of the stitch formation command, the inverted data thereof, and the total drop data consecutively,
Since the reverse stitching data is automatically created, the stitch format for reverse stitching can be automatically generated in a simple manner, and the work efficiency of sewing machine sewing can be improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the overall device configuration of the present invention, and FIG.
The figure is a block diagram showing the overall device configuration in Figure 1,
Figure 4 is a flowchart showing the overall control flow, Figure 4 is a flowchart explaining generation of reverse stitching data, Figure 5 is an explanatory diagram of stitch data, and Figures 6 (A) and (B) are sewing FIG. 7 is an explanatory diagram showing the state of continuous stitch data; FIG. 8 is an explanatory diagram showing the overall needle drop point position; FIG. A). (B) is an explanatory diagram showing the formation of seams in sewing along a curve.

Claims (1)

[Scope of Claims] 1) means for generating needle drop data from a sewing start point to a sewing end point; means for extracting data for a predetermined number of stitches from the leading or trailing end of the needle drop data; and the extraction. and means for generating inverted data of the extracted data, and the extracted data, its inverted data, and needle drop data are consecutively arranged in order or in reverse to create reverse stitch data for a predetermined number of stitches. Sewing machine stitch data creation device.