JP2009268724A - Vertical swing looper pull-out device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable even a woman to pull out a vertical swing looper with light operation force and to improve thread inserting operability when inserting a looper thread to the vertical swing looper. <P>SOLUTION: A lever type pull-out operation lever 22 to be swung centering on a pivot 25 is installed on the outside of the sewing machine bed 5, one end to be the action point of the pull-out operation lever 22 is engaged with the head part 20A of a vertical swing looper pull-out rod 20, a knob operation part 26 is provided at the other end to be a power point, the vertical swing looper pull-out rod 20 is pulled out by swinging the pull-out operation lever 22 around the pivot 25, and a lock pin 14 is moved to an unlocking position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical swing looper pulling apparatus for a sewing machine, and more particularly, a looper to a vertical swing looper that is mainly implemented in a vertical swing looper provided in a double chain stitch sewing machine or the like before sewing work or when a looper thread is cut To allow the threading operation to be performed easily, the vertical swing looper can be swung around the vertical swing looper drive shaft to a tilted position to a withdrawal position that deviates from a predetermined swing range for the sewing operation. The present invention relates to a vertical swing looper drawer device for a sewing machine.

  As this type of vertical swing looper drawer device for a sewing machine, for example, there is one described in Patent Document 1. There, a lock including a lock pin and a lock spring member for holding the swinging looper against its swinging drive mechanism in order to swing the swinging looper back and forth within a predetermined swinging range during normal sewing machine operation. And a looper pulling mechanism including a looper pulling rod that pulls the vertical swing looper to a pulling position that deviates from the predetermined swing range. When the sewing machine is stopped, the lock pin of the lock mechanism is pulled out against the elastic biasing force of the lock spring member in the lock position direction with the looper pull-out bar engaged with the lock pin, and the lock state by the lock mechanism is changed. By releasing the position, the tilting looper is tilted around the vertical swinging looper drive shaft to the drawing position deviating from a predetermined swinging range for the sewing operation. As a result, the tip side with the looper threading hole of the vertical swing looper is pulled out to a wide space on the front side (front side as viewed from the operator) from the bottom of the needle plate so that the threading operation can be performed easily and efficiently. There is something.

U.S. Pat. No. 2,688,293

  However, in the above-described conventional swinging looper pulling device of the sewing machine, although the threading operation can be performed easily and efficiently by pulling out the swinging looper, the lock pin of the locking mechanism is engaged with the looper pulling rod engaged therewith in the lock position direction. When pulling out against the elastic urging force by the spring member for locking to the loop, pull the lock pin by pulling the knob provided on one end of the looper with a finger directly, and pulling out the lock pin. Since a strong spring member for locking is used so that the locked state by the pin can be firmly held, there is a problem that a large pulling operation force is required.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to allow a woman to pull out the standing looper with a light operating force when passing the looper thread through the standing swing looper. An object of the present invention is to provide a vertical swing looper pulling device for a sewing machine that can improve threading workability.

  The vertical swing looper pulling device for a sewing machine according to the present invention will be described with reference to the reference numerals in FIGS. 1 to 8. A vertical looper is attached to the vertical swing looper drive shaft 9 via a vertical looper base 10 integrally connected to the base end portion of the vertical looper 7 and is synchronized with the vertical movement of the needle 3. Along with the reciprocating drive rotation of the drive shaft 9, the vertical swing looper 7 reciprocates over a predetermined swing range in the fabric feed direction Y inside the sewing machine bed 5 with the tip end 7 </ b> B side having the looper threading hole 11 as the upper side. The lock mechanism 13 is configured to be driven and oscillated, and holds the standing looper 7 within the predetermined swinging range, and the drawing position where the standing looper 7 deviates from the predetermined swinging range. Draw out to A looper pulling mechanism 18 that always swings the swinging looper 7 together with the swinging looper base 10 around the swinging looper drive shaft 9 in the direction of the pulling position. The locking mechanism 13 includes a member 19 and the vertical swing looper base stopper 12 having a lock hole 16 fixed on the vertical swing looper drive shaft 9 and a tapered portion 14A at the tip thereof. By engaging with the lock hole 16, the lock position for holding the standing swing looper 7 within the predetermined swing range against the elastic biasing force of the spring member 19 for pulling out the looper, and the taper portion 14A is the lock hole. A lock pin 14 that can reciprocate in parallel with the vertical swing looper drive shaft 9 over an unlock position where the lock pin 14 is disengaged, and the lock pin 14 is moved to the lock position The looper pulling mechanism 18 further pulls the lock pin 14 to the unlocked position against the elastic biasing force of the lock holding spring member 17. In the vertical swing looper drawer device of the sewing machine including the looper drawer bar 20, a scissor-type drawer operating lever 22 that swings around the pivot 25 is installed outside the sewing machine bed 5. One end portion 22A serving as an action point is engaged with the head portion 20A of the vertical swing looper pull-out rod 20, and a knob operation portion 26 is provided on the other end portion 22B serving as a power point, and the drawer operation lever 22 is swung around the pivot 25. It is characterized in that it is configured to pull out the vertical swing looper pulling bar 20 and move the lock pin 14 to the unlock position. is there.

  According to the vertical swing looper drawer device having the above-described configuration, when the sewing machine is stopped, the vertical looper pull bar 20 is pulled and locked by picking the knob operating portion 26 and swinging the drawer operating lever 22 around the pivot 25. The locked state by the mechanism 13 can be released against the elastic biasing force of the lock-holding spring member 17, and along with this release, the swinging looper by the swinging biasing force of the looper pulling spring member 19 of the looper pulling mechanism 18. 7 can be withdrawn from the predetermined swing range to the front side. At that time, the pulling operation of the looper 7 against the elastic biasing force of the lock holding spring member 17 of the lock mechanism 13 can be pulled out with a light operating force by the repulsive action of the pull-out operation lever 22. In the front side pull-out position, the swinging looper 7 can easily and efficiently pass the looper thread through the looper threading hole 11 on the tip 7B side in a wide space.

  According to the present invention, the operation of pulling the standing swing looper out of the predetermined swinging range for the sewing operation and pulling it to the tilted posture can be performed with a light operating force by the saddle-type pulling operation lever. The lever ratio is large (make the length between the knob operation part and the pivot axis sufficiently longer than the length between the one end and the pivot point as the point of action). Even if a strong locking spring member is used so that the drive swing within the swing range of the swing looper can be reliably maintained, the standing swing looper can be pulled out against its elastic force. Even women can do it lightly and it is easy to use.

  A preferred embodiment of a vertical swing looper pulling device for a sewing machine according to the present invention will be described with reference to the drawings. 1 is an external perspective view of a double chain stitch sewing machine to which the present invention is applied. FIG. 2 is a perspective view of a vertical swing looper pulling device of the sewing machine. FIG. 3 is a front view of the vertical swing looper pulling device of the sewing machine. 3 shows a sectional view taken along the line AA in FIG. 3 in a state where the vertical swing looper is held at a normal sewing operation position, and FIG. 5 shows a sectional view taken along the line AA in FIG. 6 shows a cross-sectional view taken along line BB in FIG. 3, and shows a state where the vertical swing looper is held at a normal sewing operation position. FIG. 7 shows a cross-sectional view taken along line BB in FIG. FIG. 8 is an exploded perspective view showing the configuration of the vertical swing looper drawing device in the sewing machine.

  As shown in FIG. 1, a double chain stitch sewing machine to which the present invention is applied is a needle bar (not shown) supported at the tip of a sewing machine arm 1 so as to be capable of reciprocating in the vertical direction via upper and lower bearings (not shown). A large number of needles 3 are attached to the lower end of (not shown) via a needle stock 2. A sewing pulley 4 is provided at the right outside position of the lower base end of the sewing machine arm 1, and a sewing bed 5 is extended to the left side in a state parallel to the sewing machine arm 1 at the lower base end of the sewing machine arm 1. The needle plate 6 is provided on the upper wall surface of the tip of the sewing machine bed 5 and the components constituting the sewing such as the vertical swing looper and the cloth feed mechanism (described later are well-known in the tip). The sewing machine bed 5 and the sewing machine arm 1 constitute a sewing machine frame of a double chain stitch sewing machine.

  As shown in FIG. 2 to FIG. 4 and FIG. 8, a vertical swing looper 7 and a drawing device 8 for the vertical swing looper 7 are disposed inside and outside the front end portion of the sewing machine bed 5 in the double chain stitch sewing machine. . More specifically, a plurality of swinging loopers 7 corresponding to a number of needles 3 are mounted on a swinging looper drive shaft 9 that is supported so as to be reciprocally driven and rotated in the sewing machine bed 5 so as to be orthogonal to the cloth feeding direction (rearward direction) Y. 7A is attached via a vertical swing looper base 10, and the vertical swing looper 7 is connected to the looper threader in accordance with the reciprocating drive rotation of the vertical swing looper drive shaft 9 synchronized with the vertical reciprocating motion of the needle 3. The front end portion 7B side having the hole 11 is positioned higher than the base end portion 7A so as to be reciprocally driven and swung over a predetermined swing range in the fabric feed direction Y inside the sewing machine bed 5.

  As shown in FIGS. 2 to 4, a vertical swing looper base 10 is inserted into the vertical swing looper drive shaft 9 so as to be rotatable about the axis of the vertical swing looper drive shaft 9. A looper base stopper 12 is inserted and fixed on the right side.

As shown in FIGS. 2 to 4, the vertical swing looper drive shaft 9 and the vertical swing looper base 10 are swung to reciprocally swing the vertical looper 7 within a predetermined swing range during normal sewing machine operation. A lock mechanism 13 is provided to hold the looper 7 in position relative to its swing drive mechanism.
The lock mechanism 13 has a tapered portion 14 </ b> A at the tip, and a lock hole provided in the left and right pin receivers 15, 15 projecting forward from the vertical swing looper base 10, with the tapered portion 14 </ b> A provided at an eccentric portion of the looper base stopper 12. A lock pin 14 that is movable in the axial direction so as to be engaged and disengaged from 16 and is inserted in parallel with the vertical swing looper drive shaft 9 and a lock pin 14 between the pin receivers 15 and 15 is inserted and locked. And a lock holding spring member 17 that constantly moves and urges the pin 14 in the lock position direction (right direction).

2 to 4, when the sewing machine is stopped, the lock pin 14 of the lock mechanism 13 is pulled out against the elastic urging force in the lock direction by the lock holding spring member 17 so that the lock state is maintained. Thus, a looper pulling mechanism 18 for pulling the standing swing looper 7 to a pulling position on the front side (front side as viewed from the operator) that deviates from the predetermined swing range is provided.
The looper pulling mechanism 18 has a looper pulling spring member 19 using a torsion coil spring interposed between the looper base stopper 12 and the right end of the vertical swing looper base 10. An elastic biasing force of the looper drawer spring member 19 is obtained by engaging the arm portion 19A at one end of the looper drawer spring member 19 with the looper base stopper 12 and the arm portion 19B at the other end with the vertical looper base 10 respectively. Thus, the vertical swing looper base 10 is always urged to rotate in a direction (tilt forward). The looper pulling mechanism 18 is integrally coupled to the tip of the looper pulling bar 20 and a looper pulling bar 20 arranged in parallel with the swinging looper drive shaft 9 and the lock pin 14 inside the sewing machine bed 5. And a bifurcated looper drawer plate 21 that engages the head 14B of the lock pin 14. The head 20 </ b> A of the looper drawer bar 20 protrudes outward from the tip side wall surface 5 </ b> S of the sewing machine bed portion 5.

  In the sewing machine having the above-described configuration, the tapered portion 14A at the tip of the lock pin 14 is engaged with the lock hole 16 of the looper base stopper 12 of the standing looper base 10 by the elastic biasing force of the lock holding spring member 17 in the lock mechanism 13. Thus, the vertical swing looper 7 is held in a predetermined swing range in the sewing machine bed 5, and the vertical swing looper 7 moves up and down the needle 3 by operating the sewing machine in this state. The reciprocating drive is swung over a predetermined swinging range in the material feed direction Y in synchronization with the movement. As shown in FIG. 6, the vertical swing looper 7 is attached to a spreader shaft 29 that reciprocates in the left-right direction perpendicular to the material feed direction Y in synchronization with the vertical reciprocation of the needle 3. A predetermined double chain stitch is performed with the spreader 28 that hooks and moves toward the needle thread direction.

When it becomes necessary to pass the looper thread through the vertical swing looper 7, the operation of the sewing machine is stopped, and the head 20A of the looper pull-out bar 20 is directly picked with a finger and pulled in the Z direction (see FIG. 4) as in the past. By pulling out the taper portion 14A at the tip of the lock pin 14 from the lock hole 16 of the looper base stopper 12 and moving the lock pin 14 to the unlock position, as shown in FIG. With the elastic biasing force, the vertical swing looper base 10 is tilted in the pulling-out direction (forward direction), whereby the vertical swing looper 7 is rotated in the direction of arrow F (see FIG. 7) via the vertical swing looper base 10 and a predetermined Deviating from the swinging range, the tip end portion 7B of the swinging looper is pulled out from the sewing machine bed 5 to the front drawing position. In this drawing position, the threading operation of the swinging looper thread through the threading hole 11 of the tip 7B of the swinging looper 7 can be easily and efficiently performed in a wide space.
However, when the looper drawer bar 20 is pulled out in the Z direction, the lock holding spring member 17 is strong so that the lock state by the lock pin 14 can be firmly held. Requires drawer operation force.

  Therefore, in the present invention, in order to enable the swinging looper 7 to be pulled out with a light operating force, a hook-type pulling operation lever 22 is used, and the puller pulling rod 20 is pulled out by the pulling operation lever 22. It is characterized by the fact that it can be made. That is, as shown in FIGS. 2 to 4, the drawer operation lever base 23 is fixed with a bolt 24 or the like on the front outside in the vicinity of the tip side wall surface 5S of the sewing machine bed 5 from which the head 20A of the looper drawer bar 20 protrudes. On the drawer operation lever base 23, a drawer operation lever 22 that swings horizontally around the pivot 25 is installed. The bifurcated one end portion 22A serving as the operating point of the drawer operating lever 22 is engaged with the head portion 20A of the vertical swing looper pulling rod 20, and the knob operating portion 26 is provided at the other end portion 22B serving as the power point. .

In this case, the pulling operation lever 22 is horizontally swung around the pivot 25 in the M direction (see FIG. 5) by holding the knob operation portion 26, so that the swinging looper pulling rod 20 at the one end portion 22 </ b> A of the pulling operation lever 22. Can be pulled out with a light operating force. As a result, the taper portion 14A at the tip of the lock pin 14 is detached from the lock hole 16 of the looper base stopper 12 as shown in FIG. 5, and is raised by the elastic biasing force of the looper drawer spring member 19 as shown in FIG. As the swing looper base 10 tilts forward, the tip portion 7B side of the standing swing looper 7 having the looper threading hole 11 is on the front side from the bottom of the needle plate 6 (front side as viewed from the operator). It can be pulled out to a wide space drawing position where the threading operation can be easily performed.
When the swing operation of the drawer operation lever 22 can be performed by, for example, the swing operation of the drawer operation lever 22 on the upper end wall surface of the sewing machine bed 5 in the vicinity of the needle plate 6, a large number of needles 3 are installed. However, in the above-described embodiment, the swing operation of the drawer operation lever 22 is performed on the front side wall surface 5S of the sewing machine bed 5 on the front side in the vicinity, so that the problem can be solved. It is advantageous.
As shown in FIG. 7, a stopper 27 with which the pin receiver 15 of the vertical swing looper base 10 abuts is provided on the inner bottom of the sewing machine bed 5 when the vertical swing looper 7 is pulled out.

  When the above threading operation is completed, the lock pin 14 of the lock mechanism 13 is rotated in the locking direction around the vertical looper drive shaft 9 by pushing the vertical swing looper 7 by hand, and the tapered portion 14A at the tip is the looper base. The lock 12 is engaged with the lock hole 16 of the stopper 12, and the engagement state is maintained by the elastic biasing force of the lock holding spring member 17, whereby the standing swing looper 7 is returned to a predetermined swing range to return to the original lock position. Can hold.

  In the above embodiment, the sewing machine is applied to the double chain stitch sewing machine. However, as long as the sewing machine has a vertical swing looper, the same effect can be obtained regardless of the sewing machine. .

1 is an external perspective view of a double chain stitch sewing machine to which the present invention is applied. It is a perspective view of the vertical swing looper drawer device of the sewing machine. It is a front view of the vertical swing looper drawer device of the sewing machine. A sectional view taken along line AA in FIG. 3 is shown in a state where the vertical swing looper is held at a normal sewing operation position. FIG. 3 is a sectional view taken along line AA in FIG. 3 in a state where the vertical swing looper is pulled out. FIG. 3 is a sectional view taken along line B-B in FIG. 3 in a state where the vertical swing looper is held at a normal sewing operation position. A sectional view taken along line BB in FIG. 3 shows a state in which the vertical swing looper is pulled out. FIG. 3 is an exploded perspective view showing a configuration of a vertical swing looper drawing device in the sewing machine. FIG. 3 is an external perspective view of a double chain stitch sewing machine to which the present invention is applied.

Explanation of symbols

3 Needles 5 Sewing machine bed 7 Vertical swing looper 7A Vertical swing looper base end 7B Vertical swing looper tip 9 Vertical swing looper drive shaft 10 Vertical swing looper base 11 Looper threading hole 12 Looper base stopper 13 Lock mechanism 14 Lock pin 16 Lock hole 17 Lock holding spring member 18 Looper pull-out mechanism 19 Looper pull-out spring portion 20 Vertical swing looper pull rod 20A Vertical looper pull rod head 22 Pull-out control lever 22A Pull-out control lever one end 22B Pull-out control lever The other end 25 Axis 26 Picking operation part Y Material feed direction

Claims (1)

A vertical swing looper base in which the base end portion of the vertical swing looper is integrally coupled to the base end portion is provided on the vertical swing looper drive shaft that is provided so as to be reciprocally driven and rotated in the sewing machine bed in a direction orthogonal to the cloth feeding direction. As the reciprocating drive rotation of the elevating looper drive shaft that is attached to the needle and synchronizes with the vertical movement of the needle, the elevating looper feeds the dough inside the sewing machine bed with the tip end side having the looper threading hole as the upper side. It is configured to reciprocate and swing over a predetermined swing range in the direction,
A lock mechanism that holds the vertical swing looper within the predetermined swing range; and a looper drawer mechanism that pulls the vertical looper to a pull-out position that deviates from the predetermined swing range.
The looper pulling mechanism includes a looper pulling spring member that constantly urges the swinging looper to swing in the direction of the pulling position around the swinging looper drive shaft together with the swinging looper base.
The lock mechanism is fixed on the vertical swing looper drive shaft and has a vertical swing looper base stopper having a lock hole, and has a tapered portion at the tip, and the tapered portion engages with the lock hole so that the looper pull-out is performed. Against the elastic biasing force of the spring member, the lock position where the vertical swing looper is held within the predetermined swing range and the unlock position where the taper portion is released from the lock hole. A lock pin reciprocally movable in parallel with the swing looper drive shaft, and a lock holding spring member that constantly moves and urges the lock pin in the direction of the lock position,
In the vertical swing looper pulling device for a sewing machine, the looper pulling mechanism further includes a vertical swing looper pulling rod that pulls the lock pin to an unlocked position against an elastic biasing force of the lock holding spring member.
A hook-type drawer operation lever that swings around a pivot is installed outside the sewing machine bed, and one end that is an action point of the drawer operation lever is engaged with an end of the swing looper drawer rod, A handle operating portion is provided at the other end which is a power point, and the pulling operation lever is swung around the pivot, thereby pulling out the swinging looper pulling rod and moving the lock pin to the unlock position. A vertical swing looper drawer device for a sewing machine, characterized in that it is configured.

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