JPH0312905B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to an automatic sewing machine that moves a presser foot that clamps a cloth into a shape according to pattern data stored in a storage element such as a PROM to obtain a seam of a constant shape, and particularly relates to The present invention relates to an automatic sewing machine that can prevent motor step-out. [Prior Art] An example of a conventional automatic sewing machine is shown schematically in FIG. 1 and will be explained. In the figure, 1 is a sewing machine that forms stitches, 2 is attached to the head of this sewing machine 1, and a needle down position signal, It is a detector that generates a needle top position signal and a predetermined pulse per revolution. 3 is a storage element (not shown) in which pattern data is stored;
The pattern data is read in synchronization with the needle down position signal output from the detector 2, and the feed amount data corresponding to the stitch length 4 _X , 4 _Y and control data such as forward/reverse rotation and start date 5 _X , 5 This control device 3 is a control device that outputs _Y , and this control device 3 is a device that sequentially specifies address lines of a storage medium (not shown) in which stitch pattern data is stored in advance and reads out pattern data stored in the storage medium. It consists of 6 is an X-axis controller that outputs a pulse train of forward rotation or reverse rotation to the X-axis pulse motor driver 7 based on input of feed amount data 4 _X and control data 5 _X from the control device 3; 8 is feed amount data from the control device 3; A Y-axis controller that outputs a forward or reverse pulse train to the Y-axis pulse motor driver 9 based on the input of 4 _Y and control data 5 _Y ;
10 is an X-axis pulse motor, 11 is a Y-axis pulse motor, and the combination of these X-axis controller 6, X-axis pulse motor driver 7, X-axis pulse motor 10, Y-axis controller 8, Y-axis pulse motor driver 9, and Y-axis The combination of the pulse motor 11 constitutes a device that drives the sewing object according to the pattern data by inputting pulses corresponding to the pattern data. Here, the X-axis and Y-axis controllers 6,
8 each have a built-in pulse generator. 12 is an XY table driven by an X-axis pulse motor 10 and a Y-axis pulse motor 11. Note that CW (Clock Wise) in the X-axis and Y-axis pulse motor drivers 7 and 9 refers to the input end where the rotation direction of the X-axis and Y-axis pulse motors 10 and 11 is clockwise (clockwise), and CCW (Counter Clock Wise).
Wise) indicates the counterclockwise (counterclockwise direction) input end, and A, , B, respectively indicate the output end. In the automatic sewing machine configured as described above, first, when the control device 3 reads an operation start signal (not shown), the sewing machine 1 starts rotating, the sewing machine needle starts moving up and down, and sewing begins. and. When the needle down position signal output from the detector 2 is input to the control device 3, a CPU (not shown) in the control device 3 reads data corresponding to one stitch of sewing from a storage medium in which pattern data is stored in advance. Load. Then, the sewing data for one stitch is output to the X-axis and Y-axis controllers 6 and 8 as feed amount data _4X , _4Y and control data _5X , _5Y such as sewing speed and direction. Next, this X with a built-in pulse generator
Axis and Y-axis controllers 6 and 8 send pulses in the forward and _reverse directions set by control data ₅ Quantity data 4
Outputs a pulse train equal to the number of pulses set by _X , 4 and _Y. Then, the X-axis and Y-axis pulse motor drivers 7 and 9 respectively
The coils of the axis and Y-axis pulse motors 10 and 11 are excited, and the respective X-axis and Y-axis pulse motors 10 and 11 are excited.
Rotate. Along with this rotation, a cloth presser device (not shown) attached to the XY table 12
is moved by the stitch length of one stitch, and the sewing of one stitch is completed. However, an automatic sewing machine configured in this way has the disadvantage that an expensive controller must be used to obtain a pulse train corresponding to the stitch length, making the device itself very expensive. It was hot. Another stable method is to use an element that uses a specific number of pulses output from the detector per rotation and generates a specific pulse train in synchronization with the pulses for the set feed amount data. However, this method has the disadvantage that it is not possible to change the pulse train or control slow-up/down. [Summary of the Invention] In view of the above points, the present invention has been made to solve such problems and eliminate such drawbacks. An object of the present invention is to provide an inexpensive automatic sewing machine capable of generating a pulse sequence of. In order to achieve such an object, the present invention stores pulse information for each stitch length in a memory element, and scans a predetermined address range specified by pattern data with a counter or the like. The apparatus includes a pulse array output circuit that outputs pulses corresponding to each pattern data from the data lines of the memory element. [Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 2 is a block diagram showing an embodiment of an automatic sewing machine according to the present invention, and shows an example of a pulse train generating circuit corresponding to the stitch length used in the present invention. In FIG. 2, the same reference numerals as in FIG. 1 indicate corresponding parts, and 13 is the control device 3 shown in FIG.
14 is a cloth feed period signal S and clock pulse P which are at "low level" only during the cloth feed period due to this control data 13.
A cloth feed gate circuit 15 outputs a cloth feed gate circuit 14 which counts clock pulses P only when the cloth feed period signal S from the cloth feed gate circuit 14 is at "low level" and has output terminals 1Q _A , 1Q _B , 1Q _C , 1Q _D. ,2Q _A ,2Q _B
This is a counter that outputs count data from 0 to 63. In this counter 15, 1 is an input terminal to which the clock pulse P is applied, R _D is a counter reset input terminal to which the cloth feed period signal S is applied, and 2 is an input terminal to which the output of the output terminal 1Q _D is applied. . _{16 _}
“1” is stored as pulse present and “0” as no pulse, and the above 64 bytes are output from output terminals 1Q _A to 2 of counter 15 connected to address lines A ₀ to _{A 5} .
Pulse train storage elements 17 and 18, which are sequentially addressed by the count data from Q _B , are the 1st bit data lines (transmission pulse train output) of the pulse train storage elements 16 _X and 16 _Y , respectively. Next, the operation of the embodiment shown in FIG. 2 will be explained with reference to the table shown below and FIG. 3. First, pattern data for one stitch consisting of X data and Y data is shown in Table 1 below.

[Table] In Table 1, the data corresponding to the stitch length shows the case where 5 bits are used as the feed amount data, (a) shows the control data, and (b) shows the feed amount data. Quantitative data are shown. Also, 4.0mm indicates the stitch length. Pulse train _memory elements ₁₆
The pulse train start addresses (see Figure 2) are shown in Table 2 below.

[Table] In addition, the pulse train data of the pulse train storage elements _16X and _16Y with stitch lengths near 4.0 mm shown in Table 1 are shown in Table 3 below.

【table】

〔Effect of the invention〕

As is clear from the above description, according to the present invention, without using complicated means, a simple configuration including a circuit that outputs pulses corresponding to each pattern data from the data line of the storage element can be used. The pulse array configuration can be set arbitrarily, any pulse array including slow-up-down can be generated, and the device can be manufactured at low cost, so the practical effects are extremely large.

[Brief explanation of drawings]

Fig. 1 is a block diagram schematically showing an example of a conventional automatic stitching machine, Fig. 2 is a block diagram showing an embodiment of an automatic stitching machine according to the present invention, and Fig. 3 shows the operation of Figs. 1 and 2. This is a time chart for explanation. 1... Sewing machine, 2... Detector, 3... Control device, 6, 8... X-axis, Y-axis controller, 7, 9
...X-axis, Y-axis pulse motor driver, 10,1
1...X-axis, Y-axis pulse motor, 15...Counter, 16 _X , 16 _Y ...Storage element, 17, 18...
Feed pulse train output.

Claims (1)

[Scope of Claims] 1. A device for reading out stored pattern data by sequentially specifying address lines of a storage medium storing stitch pattern data, and a device for sewing a sewing material by inputting pulse information corresponding to the pattern data. In a sewing machine equipped with a device for driving an object according to pattern data, the pulse information is stored in a memory element for each stitch length, and a counter scans within a predetermined address range specified by the pattern data. An automatic sewing machine characterized by comprising a pulse array output circuit that outputs a pulse train corresponding to each pattern data from the data line of the memory element. 2. The pulse array output circuit consists of a counter that scans within a predetermined address range specified by pattern data, and a memory element that receives count data from this counter and stores a pulse train corresponding to the stitch length. An automatic sewing machine according to claim 1, characterized in that: