JPS6054076B2 - Cloth feeding device in numerically controlled sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for sewing a desired pattern on a cloth by moving the cloth in two axes using sewing pattern data successively received from a cloth feeding device, especially a storage device, in a numerically controlled sewing machine. This invention relates to a cloth feeding device in a numerically controlled sewing machine.

FIG. 1 is a perspective view showing the overall configuration of a conventional numerically controlled sewing machine.

In FIG. 1, 10 is a sewing machine, 12 is a motor that drives the sewing machine 10 via a belt 14, 16 is a cloth presser that clamps the cloth 18, and 20 is an opening and closing of the cloth presser 16 for attaching and removing the cloth 18. For example, opening/closing devices such as air cylinders,
22 is a cloth drive device that moves the cloth 18 in the X-Y axis direction together with the cloth presser device 16; 24 is an X pulse motor that moves the cloth drive device 22 in the X-axis direction; 26 is the cloth drive device 22
28 is a needle position detector of the sewing machine 10 with a built-in pulse generator (not shown); 30 is a sewing machine fixed position stop/thread trim control/cloth feed control/motor speed control 32 is a control device that performs sewing patterns (32) using a semiconductor memory element (PROM), a magnetic card, etc.
pattern) data storage device. A conventional numerically controlled sewing machine has the above-mentioned configuration, and its operation will be explained next.

The cloth 18 is held by the cloth feeding device 16, and data in which sewing patterns are programmed in advance according to the sewing order is stored in the storage device 32.
Then, when a start switch (not shown) is operated, the sewing machine 10 is driven by the motor 12 and starts sewing. In synchronization with the sewing operation of the sewing machine 10, the control device 30 stores the data in the storage device 32. is read out and converted into a drive signal for the cloth drive device 22, and the X pulse motor 24 and Y pulse motor 26 are driven by the drive signal to operate the cloth drive device 22, and a desired pattern is sewn onto the cloth 18. It's something that will happen.

At this time, while the needle 34 of the sewing machine 10 is inserted, the cloth 18
It is necessary to move the cloth 18 while the needle 34 is coming out. Conventionally, the cloth feeding timing of this type of cloth driving device 22 has been mechanically synchronized or
In order to detect the height position of the needle 34 based on the rotation angle of the main shaft 10a of the sewing machine 10, a mechanism that generates pulses in synchronization with the cloth feed timing, for example, a half-moon gear 36 as shown in FIG. A pulse sensor 38 is attached to the gear 10a and is opposed to the gear 36.

FIG. 2 shows the operation timing of the needle 34 and cloth driving device 22, in which a indicates the motion of the needle 34, and b
is the cloth feeding motion.

Since the cloth feed timing mechanism of the conventional cloth drive device is constructed as described above, it is necessary to manufacture a special half-moon-shaped gear and perform special processing to attach it to the main shaft 10a of the sewing machine 10. Further, there were drawbacks such as loss of balance during high-speed rotation and a large and expensive detector section. The present invention was made in view of the conventional problems mentioned above, and its purpose is to have a simple configuration, low cost, stable performance, and to freely start the movement of cloth feed without the need for specially shaped or processed parts. An object of the present invention is to provide a cloth feeding device for a numerically controlled sewing machine in which points can be set.

In order to achieve the above object, the present invention includes a sewing machine, a motor that drives the sewing machine, a cloth presser device that clamps cloth, and
a cloth drive device that moves the cloth in two axial directions together with the cloth presser; a storage device that stores sewing pattern data; a needle position detector of the sewing machine; a pulse generator that detects the motor speed; A counter that can be preset arbitrarily counts pulses from a pulse generator triggered by a needle position signal from a needle position detector, and is opened by a count completion signal of the counter and sends pulses from the pulse generator to send data. The present invention is characterized in that it includes a gate that supplies a pulse train for generation to the cloth driving device. Further, the present invention is characterized in that by presetting the number of pulses of the pulse generator, the timing from the generation of the needle position signal from the needle position detector to the start of cloth feeding can be freely set.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 4 is a block diagram showing the related structure of each part of the apparatus of the present invention, in which the same parts as in FIG. 1 are denoted by the same reference numerals. Here, the same parts as those in FIG. 1 are the same as those described above, so the explanation thereof will be omitted. In FIG. 4, a needle position detector 40 and a pulse generator 42 as a speed detector of the motor 12 are attached to the main shaft 10a of the sewing machine 10. A control circuit 44 includes a speed control circuit 44a for the sewing machine drive motor 12 and a sewing machine control circuit 44b for controlling the sewing machine 10 and cloth drive device 22.

FIG. 5 is a specific circuit configuration diagram showing one example of the control circuit 44. As shown in FIG.

In FIG. 5, 46a and 46b are AND elements, 48a and 48b are data flip-flops, and 50a
, 50b is a one-shot circuit, 52 is a preset type down counter, 54 is an up counter, 56a, 56b
100 is the pulse signal of the pulse generator 42, 102 is the needle down position signal of the needle position detector 40,
104 is the needle top position signal of the needle position detector 40, 106 is 2
The reset signals 108-X and 108-Y are output from other internal circuits between the two needle down position signals, and the cloth feeding movement data in the x and y directions read from the storage device 32, 11
0-X, llO-Y are modi euro counters 56a, 56
This is a drive command signal for the X-Y pulse motors 24 and 26 outputted from b. The embodiment of the present invention has the above configuration, and its operation will be explained below with reference to FIG.

The sewing machine control circuit 44b controls the sewing machine 10 and cloth drive device 22 (FIG. 1) according to the program based on the data read from the storage device 32 to perform sewing operations. At this time, the speed control circuit 44a simultaneously controls the speed of the sewing machine drive motor 12 so as to obtain the optimum sewing speed. During the above sewing operation, the set value of the set switch 58 is preset in the down counter 52 in synchronization with the falling edge 102a of the needle down position signal 102.

Next, in synchronization with the rising edge 102b of the needle down position signal 102, the data flip-flop 48a is set, and the gate of the AND element 46b is opened. For this reason, the pulse generator 4
2 pulse signal 100 is input to the down counter 52 via the AND element 46b, which counts down from the preset value and outputs a borrow at zero, and the subsequent data flip-flop 48b is set. The gate of AND element 46a is opened by . As a result, the pulse signal 100 of the pulse generator 42 is transmitted to the AND element 46a.
is input as a clock pulse 112 to the modulus counters 56a and 56b, and at the same time the up counter 5
4 is also input.

When the number of input pulses reaches a predetermined number, a carry is output from the up counter 54 and the one-shot circuit 50b
is driven. The down counter 52, data flip-flop 48b1 and up counter 54 are reset by the drive output of the one shot circuit 50b.

Therefore, the gate of the AND element 46a is closed again, and the input of the pulse signal 100 to the pulse generator 42 is stopped. Through this series of operations, the fabric can be fed only when the needle 34 comes out of the fabric while being synchronized with the needle. Therefore, by modulating the pulse signal passed through the AND element 46a in the modi-euro counters 56a and 56b with the cloth feed data programmed in the storage device 32, cloth feed is performed in accordance with the data.
A pattern according to the data programmed in the storage device 32 is sewn onto the cloth 18.

The above operation timing is shown in FIG. In the figure, A is reset by the down counter 52, and B is set by the up counter 54. Although the operation of the illustrated embodiment has been explained based on the needle down position signal 102, the same effect as described above can be obtained using the needle up position signal 104.
As described above, in the cloth feeding device of the present invention, the cloth feeding timing is controlled by the needle position detection signal and the pulse signal from the pulse generator, so that the device is simplified, inexpensive, and has stable performance. .

Further, by presetting the number of pulses of the pulse generator, there are effects such as being able to freely set the cloth feeding timing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall configuration of a conventional numerically controlled sewing machine, Fig. 2 is an operation timing diagram of the needle and cloth feed, Fig. 3 is a perspective view of the conventional sewing machine, and Fig. 4 is a diagram showing each part of the device of the present invention. FIG. 5 is a block diagram showing the related configuration, and is a control circuit diagram of the apparatus of the present invention. Identical members in each figure are given the same reference numerals; 10 is a sewing machine; 1 is a sewing machine;
2 is a motor, 14 is a belt, 16 is a presser device, 18 is cloth, 20 is an opening/closing device, 22 is a cloth drive device, 24 and 26 are X-Y pulse motors, 28 is a needle position detector, and 30 is a control device , 32 is a storage device, 34 is a needle, 36 is a gear, 38 is a pulse sensor, 40 is a needle position detector, 42 is a pulse generator, and 44 is a control circuit.

Claims (1)

[Claims] 1. A sewing machine, a motor that drives the sewing machine, a cloth presser device that clamps cloth, a cloth drive device that moves the cloth along with the cloth presser device in two axial directions, and stores sewing pattern data. a needle position detector of the sewing machine; a pulse generator for detecting the motor speed; and counting pulses from the pulse generator by triggering the needle position signal from the needle position detector. A numerically controlled sewing machine comprising: a counter that can be preset arbitrarily; and a gate that opens in response to a count completion signal from the counter and supplies pulses from the pulse generator to the cloth driving device as a pulse train for sending data. cloth feeding device. 2. The device according to claim 1, characterized in that by presetting the number of pulses of the counter, the timing from the generation of the needle position signal from the needle position detector to the start of cloth feeding can be freely set. Cloth feeding device for numerically controlled sewing machines.