JP2008264485A - Thread handling device for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread handling device for a sewing machine for solving the problem that a sewing machine tends to make nest-like stitches during sewing. <P>SOLUTION: The thread handling device includes a thread handling block put on a machine neck between a thread nipper nut and a thread nipper, and a drive to reciprocate the thread handling block. The thread handling block has a thread inserting hole. As the thread handing device is put on the sewing machine, stitches are formed neatly, and no nest-like stitches are formed. The whole structure is simple, operation is simple, manufacturing cost is low, and operation stability is favorable. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to the field of sewing machines, and is a handle that can produce a beautiful yarn mark when the sewing machine is started by pulling back a long yarn mouth.

  At start-up, ordinary sewing machines always wrap around in a swarm shape, which tends to be a bird's nest-shaped thread mark on the fabric, affecting the beauty and sewing quality of the fabric. As a cause, an ordinary sewing machine has a long thread hole left in the threading hole after automatic thread trimming at the previous stop. At restart, the needle moves down, moves the thread and stabs the cloth, leaving the long threadhole below the fabric. During subsequent sewing, this long clue forms a bird's nest-shaped thread mark on the fabric.

  Various cutting devices have been invented in order to shorten the remaining thread ends and solve the above problems. For example, a Chinese patent document has published a sewing machine line device [application number: CN02145764.6]. In the apparatus, the blade of the cutting cutter approaches the needle hole in the horizontal direction, so that after the cutting, the thread hole remaining on the fabric is shortened. With this method, the remaining yarn traces are reduced, but the yarn mouth cannot be completely canceled, and therefore the above-mentioned problem cannot be solved thoroughly.

  In addition, it consists of an electromagnetic unit, a main arm, an auxiliary arm, and a pull-back portion where there was a person who invented a pull-back device [application number: CN 96207346.6] for a sewing machine. The main arm and auxiliary arm are controlled by the electromagnetic unit, thereby moving the pull-back part and pulling back the long clue. Although the above-mentioned technical problems have been solved to some extent, the overall structure of the device is complicated, the manufacturing cost is high, the assembly and maintenance are not only difficult, but the main arm and auxiliary arm often fail during operation, Work stability is poor.

  The purpose of the present invention is to break through the longcomings of existing technology, pull back the long thread end to remove the thread, and use it as a sewing machine holder that becomes a bird's nest-shaped thread mark on the fabric. Reasonable design and simple structure, so work efficiency is good.

  In order to achieve the above object, the present invention employs the following technical solution. This sewing machine is installed at the nose of the sewing machine and is located between the thread pinching nut and the tension device. The characteristic of the holding machine is the drive that moves the holding block and the holding block on the nose back and forth. There is a hole through which the thread passes through the block that is made up of devices.

  The present invention uses a horizontally moving container to pull back the long thread remaining when the sewing machine stops. During normal sewing, that is, when the sewing needle moves up and down, the block held by the apparatus does not move. At the moment when the sewing needle stops moving, the machine begins to operate and pulls back the clue with the handle. Subsequently, the sewing machine needle returns to the sewing state in which it moves up and down again. Therefore, the thread head is very short and does not leave a bird's nest-shaped thread mark on the fabric. This improves sewing quality of sewing products and saves sewing cotton. When the technical solution of the present invention is implemented, the above-mentioned drive device automatically controls according to the state of the needle using a control circuit attached to the sewing machine. Increased. Since the control circuit of the sewing machine and the control of the driving device are general techniques, this manual will not be described again.

  In the above-mentioned sewing machine holder, the drive device includes a cylinder fixed to the nose, and the holding block is at the top of the piston connecting rod of the cylinder. The piston connecting rod moves horizontally by moving the holding block according to the atmospheric pressure. While the sewing machine is in operation, the piston connecting rod is in the (extended) extended state. When canceling, move the container held by the piston connecting rod and return to the right. Obviously, the cylinder here can also be a hydraulic cylinder, connected to the hydraulic system and moving the piston connecting rod horizontally.

  More specifically, in the above-described sewing machine holder, the cylinder was fixed to the nose using a support. The holding block is a slide that can be reciprocated along the horizontal direction on a support. In order to improve the work stability of the holding block, a horizontal rail is provided between the holding block and the support so that the holding block can reciprocate gently.

  As another proposal, in the above-mentioned sewing machine holding device, the driving device includes one step motor fixed to the nose, the spindle of the step motor is connected to one side of the bulk, and the holding block is the bulk Installed on the other side. The moving spindle repeatedly moves the bulk so that the handle at the tip of the bulk can be moved horizontally. While the sewing machine is in operation, the bulk approaches the pinch nut and tension device. When canceling, the bulk is facing right and is far away from the pinch nut and tension device.

  More specifically, in the above-described sewing machine holder, the step motor is fixed to the base, and the base is fixed to the nose with a single plate. The holding block is installed outside the bulk and has one pin shaft. There is a roller for sewing cot on the pin shaft. This roller is installed to adjust the length of the sewing cotton on both sides so that there is no thread trimming due to force imbalance.

  According to another proposal, in the above-mentioned sewing machine holding device, the driving device includes one electric magnet fixed to the nose, and the holding device is fixed to the top of the armature of the electric magnet. When the sewing machine is in operation, the armature stretches and expands, and when it is stopped, the armature returns to the right.

  More specifically, in the above-mentioned sewing machine, the electromagnet is fixed to the nose by the installation plate. The block to be handled must be a slide that can be moved back and forth horizontally on the installation plate. A rail is horizontally provided between the block and the installation plate at that time, so that the block can be gently reciprocated.

  The horizontal movement distance of the blocks to be handled is provided as necessary. In the above-mentioned sewing machine holding device, the reciprocating distance of the holding block is 20 to 40 mm.

  In the above-mentioned sewing machine holder, one stopper is provided on each side of the plate (to cover both ends of the cotton when the holding block pulls the sewing cotton). When the bulk swings away from the pinch nut and tension device, the upper and lower stoppers cover the cotton, increasing the work stability.

  In the above-mentioned sewing machine holding device, the bulk of the bar is bent into two Z-shaped bars, one end is fixed to the spindle with a nut and the other end is bifurcated. It becomes a hole.

  Compared with the existing technology, the advantages of this sewing machine are as follows.

  1. Move the gripper with sewing cotton with the drive unit and move it, and pull back the sewing cotton remaining during sewing using the horizontal movement of the gripper. For this reason, the sewing machine does not leave a bird's nest-shaped thread mark at the time of restart, and becomes a beautiful thread mark.

  2. The work efficiency is good because of the rational design and simple structure that is easy to assemble on the nose of the existing sewing machine. Moreover, the manufacturing cost is low.

  3． In addition to saving cotton, there is no need to sort out the threadholes, improving the quality of sewing products and reducing costs.

Example 1
As shown in FIGS. 1 and 2, a thread pinching nut 11, a tension device 12, a buffer hook 13, a right pin gear 14, a scooping lever 15, a left pin gear 16, and a sewing needle 17, in which sewing cotton 6 passes through the machine nose 1 in sequence. Is installed. This sewing machine is installed in the nose 1 and is located between the thread pinching nut 11 and the tension device 12. The holding device comprises a holding block 2 in the nose 1 and a driving device for reciprocating the holding block 2. The sewing cotton 6 passes through the thread pinching nut 11 and then goes through the holding block 2 to the tension device 12.

  The drive device includes a cylinder 31 fixed to the nose 1 and a holding block 2 fixed to the top of the piston connecting rod 32 of the cylinder 31. More specifically, the support 33 is fastened with screws to the side of the nose 1, the support 33 has an emboss 33a, and the overall shape is L-shaped. Attach the cylinder 31 to the emboss 33a. The block 2 to be handled is a slide that can be reciprocated along the horizontal direction on the support 33. There is a hole 2a through which the thread is held in the block 2 to be handled. In order to move more stably, a rail can be provided between the support 33 and the block 2 to be handled. The cylinder 31 is connected to the intake pipe 34 and the exhaust pipe 35 using the intake pipe joint 31a and the exhaust pipe joint 31b, respectively. The operation of the piston connecting rod 32 is controlled by the atmospheric pressure.

  In this embodiment, the structure, layout and operation of parts such as the thread pinching nut 11, tension device 12, buffer hook 13, right pin gear 14, scooping lever 15, left pin gear 16 and sewing needle 17 are all existing technology. The engineers in the field are familiar with it and will not be described again here. It is easy to assemble the present invention on an existing sewing machine, the structure is simple, and the remodeling cost is low.

  The operation of this embodiment is as follows.

  As shown in Fig. 1, the machine does not move when the sewing machine is operating normally. The handling block 2 is between the thread pinching nut 11 and the tension device 12, and the sewing cotton 6 between them does not twist. When the sewing machine is operated, the tension device 12 clamps the sewing cotton 6 and the sewing needle 17 moves up and down with the sewing cotton 6. As shown in FIG. 2, when the sewing machine stops, that is, when the sewing needle 17 returns to the initial position after reciprocating several times, the holding device starts to operate. At this time, the cylinder 31 is activated and drives the block 2 to be moved to the right. Accordingly, the tension device 12 is unclamped, and the sewing cotton 6 that has passed through the block 2 to be moved also moves to the right, and the sewing cotton 6 is pulled and twisted. As the block 2 to be held subsequently moves to the right, the sewing cotton 6 is partially pulled back, and the thread stop at the previous stop is collected. The tension device 12 clamps or unclamps the sewing cotton 6. Even if it clamps, it is not a real clamp and sewing cotton 6 can still move a little.

  When the sewing machine is started again, that is, when the sewing needle 17 is moved downward, the cylinder 13 is reset by moving the piston connecting rod 32. When the sewing needle 17 comes to the lowest end, the block 2 to be held returns to the original position in the left direction, and the sewing machine starts to work. Thus, the bird's nest-shaped yarn mark at the time of restarting is not formed at the long thread end. In the present embodiment, the horizontal movement distance of the block 2 to be handled is 30 mm.

(Example 2)
As shown in FIG. 3, in this embodiment, the driving device includes a step motor 41 fixed to the nose 1. The spindle of the step motor 41 is connected to one side of the bulk, and the block 2 to be held is the other side of the bulk 42. Installed.

  More specifically, the step motor 41 is fixed to the base 43 with screws, and the base 43 is fixed to the side of the nose 1 with a single plate 44. The plate 44 is connected to the nose 1 with a screw. As shown in FIG. 4, in this embodiment, the bulk 42 has two aligned rods 42 a bent into a Z shape, one end fixed to the spindle with a nut 47, and the other end bifurcated. The bulk 42 is on the outer periphery of the step motor 41. The pin shaft 45 is attached to the cross hair. There is a thread winding roller 46 at the pin shaft 45. The pin shaft 45 with the roller 46 is attached to the cross hair and becomes a hole 2a through which the thread passes. In order to improve the work stability, one stopper 44a is provided on each side of the plate 44 (to cover both ends of the cotton when the holding block 2 pulls the sewing cotton).

  The operation of this embodiment is as follows.

  When the sewing machine is in normal operation, the instrument it holds does not move. The handling block 2 is between the thread pinching nut 11 and the tension device 12, and the sewing cotton 6 between them does not twist. When the sewing machine stops, that is, when the sewing needle 17 returns to the initial position after reciprocating movement several times, the holding device starts to operate. At this time, the step motor 41 rotates and moves the bulk 42 to swing to the right. Since the bulk 42 has horizontal movement or vertical movement, the block 2 to be held is driven and moved to the right. Accordingly, the tension device 12 is unclamped, and the sewing cotton 6 that has passed through the block 2 to be moved also moves to the right, and the sewing cotton 6 is pulled and twisted. As the block 2 to be held subsequently moves to the right, the sewing cotton 6 is partially pulled back, and the thread stop at the previous stop is collected.

  When the sewing machine starts up again, that is, when the sewing needle 17 moves downward, the step motor 41 moves the bulk 42 to reset it. When the sewing needle 17 comes to the lowest end, the block 2 to be held returns to the original position in the left direction, and the sewing machine starts to work. In this embodiment, the horizontal movement distance of the block 2 to be handled is 20 mm. Since other contents are the same as those of the first embodiment, they will not be described again here.

(Example 3)
As shown in FIG. 5, in this embodiment, the driving device includes one electric magnet 51 fixed to the nose 1, and the block 2 to be held is fixed to the top of the armature 52 of the electric magnet 51. More specifically, the electric magnet 51 is fixed to the nose 1 using the installation plate 53, and the installation plate 53 is fastened to the nose 1 with screws. The block 2 to be handled is a slide that can be reciprocated along the horizontal direction on the installation plate 53. Furthermore, in order to move smoothly and stably, a rail can be provided between the support 33 and the block 2 to be handled.

  The operation of this embodiment is as follows.

  When the sewing machine is in normal operation, the instrument it holds does not move. The handling block 2 is between the thread pinching nut 11 and the tension device 12, and the sewing cotton 6 between them does not twist. When the sewing machine stops, that is, when the sewing needle 17 returns to the initial position after reciprocating movement several times, the holding device starts to operate. At this time, the electric magnet 51 attracts the armature 52 and moves to the right, and drives the block 2 to be moved to the right. Accordingly, the tension device 12 is unclamped, and the sewing cotton 6 that has passed through the block 2 to be moved also moves to the right, and the sewing cotton 6 is pulled and twisted. As the block 2 to be held subsequently moves to the right, the sewing cotton 6 is partially pulled back, and the thread stop at the previous stop is collected.

  When the sewing machine is started again, that is, when the sewing needle 17 moves downward, the armature 52 of the electromagnetic magnet 51 is reset. When the sewing needle 17 comes to the lowest end, the block 2 to be held returns to the original position in the left direction, and the sewing machine starts to work. In this embodiment, the horizontal movement distance of the block 2 to be handled is 40 mm. Since other contents are the same as those of the first embodiment, they will not be described again here.

  The above embodiments are merely examples used to illustrate the present invention. Engineers who belong to the technical field of the present invention can be modified, supplemented, or replaced by similar methods to the above-described embodiments, but the content of the present invention is not deviated or the scope of patent application is not exceeded. To do.

  The text often includes the nose 1, the thread clamp nut 11, the tension device 12, the buffer hook 13, the right pin gear 14, the scooping lever 15, the left pin gear 16, the sewing needle 17, the holding block 2, the threading hole 2a, and the cylinder 31 , Intake pipe joint 31a, exhaust pipe joint 31b, piston connecting rod 32, support 33, emboss 33a, intake pipe 34, exhaust pipe 35, step motor 41, bulk 42, rod 42a, base 43, plate 44, stopper 44a, pin shaft 45, roller 46, nut 47, electric magnet 51, armature 52, mounting plate 53, sewing cotton 6, and other terms are used, but other terms are not necessarily used. However, these terms are used to explain and understand the present invention. If these terms are understood correctly and not used, the contents will be different from those of the present invention.

It is a structure figure of the sewing state in Example 1 of this invention. It is a structure figure of the starting state in Example 1 of this invention. It is a structure figure of the starting state in Example 2 of the present invention. In Example 2 of this invention, a step motor is a structure amplification figure regarding a step with a bulk. It is a structure figure of the starting state in Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nose 2 Block 2a Thread hole 6 Sewing cotton 11 Thread pinching nut 12 Tension device 13 Buffer hook 14 Right pin gear 15 Scoop lever 16 Left pin gear 17 Sewing needle 31 Cylinder 31a Intake pipe joint 31b Exhaust pipe joint 32 Piston connecting rod 33 Support 33a Emboss 34 Intake pipe 35 Exhaust pipe 41 Step motor 42 Bulk 42a Bar 43 Base 44 Plate 44a Stopper 45 Pin shaft 46 Roller 47 Nut 51 Electromagnet 52 Armature 53 Installation plate

Claims (4)

  A machine that is held by the sewing machine. It is installed on the nose (1) of the sewing machine and is located between the thread clamp nut (11) and the thread clamp (12). ) And a drive device that reciprocates the holding block, and has a hole (2a) for threading the holding block (2).   The drive device comprises a cylinder (31) fixed to the nose (1), and the handling block (2) is at the top of the piston connecting rod (32) of the cylinder (31). The machine of the described sewing machine.   The cylinder (31) is fixed to the nose (1) using a support (33), and the block (2) to be held is a slide that can move back and forth along the horizontal direction on the support (33) The sewing machine holding device according to claim 2.   4. The sewing machine holder according to claim 1, wherein the holding block (2) has a reciprocating distance of 20 to 40 mm along a horizontal plane.

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