JPH073583U - Sewing machine cloth control device - Google Patents

Abstract

(57) [Summary] [Purpose] To reliably sew the small circular arc portion at the rear end of the cloth fed by the cloth feed mechanism of the sewing machine. [Structure] For the cloth fed by the cloth feed mechanism of the sewing machine, an operating means for applying a cloth pulling moment to the side of the cloth feed mechanism is provided, and the operation of the operating means is continued even after the cloth trailing edge detection signal is generated. Configured.

Description

[Detailed description of the device]   [Industrial application]   This invention relates to a cloth control device for a sewing machine, and more particularly, to start the sewing machine by detecting the start and end of the cloth. In addition to stopping the motion, the side edge of the cloth is detected and the rotary mode is applied to the cloth by an actuator such as an electromagnet. The stitches are formed on the cloth edge while the cloth edge is moved in one direction by controlling the pressing body that gives the ment. The present invention relates to a sewing machine cloth control device.   [Conventional technology]   In this type of prior art, as shown in the plan view of FIG. For a certain needle 2, the pressing portion 19 operated by the operating body is a cloth feed direction line passing through the needle 2. It is provided on the left side of one side of L and on the front side of the needle 2, and further includes a cloth end detector 11b. The side edge detector 11a of the cloth is disposed further in front of the pressing portion 19 in the cloth feeding direction, and two Detectors were installed in parallel.   And, the control of the actuating body that operates the pressing part is controlled by the cloth no signal from the side edge detector of the cloth. When it is activated, the pressing part comes into contact with the cloth and a rotational moment is applied to the cloth to move it to the right. , It is made inactive by the cloth presence signal to reduce or eliminate the rotation moment, and The cloth side edge becomes as shown by the chain double-dashed line in Fig. 4 and the cloth-less signal may be generated from the end detector. In relation to and, the actuating body is made inoperative, and thereafter the rotational moment is applied by the pressing body. It was a unique structure.   [Problems that the device tries to solve]   Therefore, in the conventional technique, an arc larger than the arc shown by the chain double-dashed line in FIG. It is possible to sew only the fabric edge of the fabric, and only the fabric with a very limited fabric edge shape. I could only adapt to it.   [Means for solving problems]   This invention is designed such that a predetermined number of stitches or a predetermined time elapses after the cloth-free signal is generated from the end detection signal. By providing a control means for maintaining the operating state of the operating body until later, the above-mentioned conventional technique is The problem of the technique was solved.   [Work]   This device is designed to detect the side edge as shown by the chain double-dashed line in Fig. 4 in the feed direction. Even when the cloth non-signal is generated from the machine and the cloth non-signal is also generated from the end detector, the specified number of stitches Alternatively, since the control means for maintaining the operating state of the operating body is provided until a predetermined time has elapsed, After that, the pressing body further applies a rotation moment to the cloth.   [Example]   An embodiment of the present invention will be described below with reference to the drawings. 1 is a bed of an overlock sewing machine, which has a needle 2 and moves up and down Needle bar 3, a presser arm 4 with a presser foot 4 at the tip and a rotatable base, and a cloth at the tip. A knife arm 7 having a cutting knife 6 and swinging in conjunction with a sewing machine mechanism is provided. 8 is The cloth guide is located on the bed surface before the work clamp, and guides the end surface between the cloth surface and the bed surface. Form a gap of 9 thickness. Reference numeral 10 denotes a light emitting unit that constitutes one of the detection units. Although not shown, it is provided with two light emitters arranged in parallel with their lower sides facing each other. 11 is a detector Two holes, which are the light receiving part facing the light emitting part which constitutes the other, and which are formed in the bran guide 8. Placed on the bed surfaces of 12a and 12b, the side edge detector 11a of the cloth and the rear edge detector of the cloth It consists of 11b.   A cloth control device 13 is fixed to a support plate 14 provided on the sewing machine head 1 as a whole. Has been. Reference numeral 15 is a twin rod cylinder as an actuating body, and its rods 15a, 15 A flat support 16 is fixed to the lower end of b. 17 is a fixed plate, the base of which is the support 1 It is fixed to the lower surface of 6 and the tip is projected laterally. 18 is an elastic plate, the base of which is a fixed body 17 is fixed to the lower surface, the free end is bent and extended downward and sideways, and a pressing portion is provided at the tip. Then, the ball 19 is fixed.   Reference numeral 20 is an adjusting plate, and the base is fixed to the elastic plate 18 as shown in FIGS. The end extends parallel to the lower surface of the fixing plate 17 to form the long hole 20a. Reference numeral 21 denotes an adjusting screw, which penetrates the elongated hole 20a of the adjusting plate 20 from below to above. A spring 22 is loosely fitted to the outer periphery of the stem and screwed into the screw hole of the fixing plate 17 from below. And project it upwards. Further, fix the fixing screw 23 on the protruding portion of the adjusting screw 21. In addition, the rotary knob 24 is fixed to the upper end of the adjusting screw 21.   Reference numeral 25 denotes a stopper support plate, the lower end of which is fixed to the side end surface of the support body 16, The rod cylinder 15 extends upward along the side surface, and the upper end of the cylinder 15 is extended. Fold above the top of the. 26 is a screw as a stopper, which supports the stopper Screw it into the bent part of the plate from above, and make its lower end face the upper surface of the cylinder and stop it. It is fixed in place by a nut 27.   Reference numeral 28 denotes a lifting plate, the base of which is fixed to the side end of the pressing arm 5 and the tip of which is bent to bend the elastic plate 1. It extends to the lower surface of 8.   Next, the configuration of the control device and the operation of each part will be described centering on the flow of FIG.   In the straight line counter in this flow, is the side edge of the cloth separated from the side edge detector 11a? Count the number of stitches on the sewing machine, and after Is to count the number of stitches until the rear end of the cloth comes off the rear end detector 11b, The number of stitches is the setting value of the linear counter, for example, 10 stitches or less (right angle of cloth rear end), or etc. It is to judge whether it is higher or higher (cloth rear end curve).   For the delay counter, the linear counter is equal to or more than the set value of 8 stitches ( (Cloth trailing edge curve) starts counting, and that number is the set value of the delay counter, For example, it is determined whether the number of stitches is within 8 stitches, equal to or more than 8 stitches.   Furthermore, for the sewing end counter, the number of stitches on the linear counter is less than the preset number of 10 stitches. If it is judged that the cloth rear end is a right angle, the set value, for example, 50 stitches, is counted. And a signal is generated when it becomes equal to the set value.   Next, a description will be given according to the flow of FIG.   First, after the power is turned on, the cloth W is applied to the lower surface of the cloth guide, and its side end is the end surface guide 9. Insert so that it touches.   As a result, the end detector 11b detects the presence of the cloth, and after a predetermined time elapses, the sewing machine At the same time as starting, the linear counter is cleared to 0, and the sewing machine feeds cloth and stitches. To start.   At this time, the side edge detector 11a detects the side edge of the cloth, and the side edge of the cloth detects the side edge detector 11a. The twin rod cylinder 15 (hereinafter referred to as the cylinder) becomes the second The elastic plate 18 is actuated as shown in FIG. A rotary motion that pushes W firmly and moves the cloth W to the right in FIG. And the cloth side end is brought into contact with the end face guide 9. As a result, the side edge detector 11a Is covered by the cloth side edge, the cylinder 15 becomes inoperative as shown in FIG. The ball 19 pushes the cloth W with a small force.   The cloth being sewn has a curved portion, and the cloth side end is disengaged from the side end detector 11a. If the side edge cannot be moved all the way to the right due to the operation of 15, first detect the side edge of the cloth. The linear counter counts the number of stitches after the cloth side end is detached from the container 11a. If the side edge of the cloth covers the side edge detector 11a within 10 stitches of the set value, The linder 15 continues to operate.   Also, if the side edge does not cover the detector within 10 stitches of the above set value, that is, the straight line cover When the unter reaches 10 stitches or more, clear the sensor delay counter. If the cloth does not cover the end detector 11b, the sensor delay counter Starts counting the number of stitches. This number of stitches is set to 8 or more for the sensor delay counter. If the cloth rotates inside and the cloth side edge covers the side edge detector, the cylinder 15 will not work properly. It becomes a movement and continues the suturing.   Also, as described above, the linear counter has 10 stitches and the sensor delay counter. If the side edge of the cloth does not cover the side edge detector 11a even if the number of needles of the sewing machine exceeds 8, or Before the number of stitches on the line counter reaches the set value of 10 stitches, the cloth trailing edge should be the end detector 11b. If it comes off, deactivate cylinder 15 and set the sewing end counter. Clear and start counting the number of stitches.   When the sewing end counter counts the set value of 50 stitches, a stop signal is issued. Then stop the sewing machine.   In the above example, the number of stitches was controlled, but these are set as a timer. It can be replaced, or it can be a combination of a counter and a timer.   Also, without using a counter or timer, the cloth end detector 11b can be used for side edge detection. It may be arranged ahead of the device 11a in the cloth feeding direction, that is, closer to the stitched portion.   [Effect of device]   As described above, the present invention applies a rotation moment to the cloth to keep the cloth side end at a constant position. The actuator that controls the pressing body that is maintained at Regarding control by the detector and the end detector,   Operate the actuator until a specified number of stitches or a specified time elapses after the cloth no signal is generated from the end detector. Since the control means for maintaining the moving state is provided,   Compared with this type of conventional one, cloth edges with small arcs can also be sewn, so the cloth shape Has a wide range of sewability and has the effect of excellent versatility.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view, FIG. 2 is a side view of a cloth control device in which a cylinder is operating, and FIG. 3 is a partial view of FIG. 2 in which a cylinder is inactive. FIG. 4 is a plan view showing the positional relationship among the needle, the ball and the detector, and FIG. 5 is a flow chart. 11a ... Side end detector 11b ... End detector 15 ... Cylinder 19 as operating body ... Ball as pressing body

Claims (1)

[Claims for utility model registration] Side edge detectors that are arranged at the side edges of the moving cloth and that generate presence / absence signals for the cloth edges, and end detectors that detect the cloth edge and generate presence / absence signals, An actuator that is activated by the absence of a cloth signal from the side edge detector and is inactivated by a cloth presence signal, and an actuator that is placed on the side of the cloth feed direction line that passes through the needle and in front of the stitching part in the cloth feed direction. The pressing body that comes into contact with and separates from the cloth that moves in conjunction with the cloth and applies a turning moment to the cloth in one direction, and the operating body until the specified number of stitches or the specified time has elapsed after the cloth no signal is generated from the end detector. A cloth control device for a sewing machine, comprising: