JP2871178B2 - Needle bar release device of zigzag sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle bar releasing device for a zigzag sewing machine for interrupting vertical movement of a needle bar during basting or pattern sewing.

[0002]

2. Description of the Related Art A conventional needle bar release device of this type includes:
For example, there is a needle bar releasing device used for a linear sewing machine described in Japanese Patent Publication No. 57-17106. The needle bar releasing device is provided with an engagement / disengagement mechanism for releasing the grip at a grip portion of an up-and-down movement arm that grips the needle bar and moves up and down. When the release member is moved to the vertical movement position of the engagement / disengagement mechanism, the connection of the engagement / disengagement mechanism is released, and the needle bar is released from the vertical movement. Conventionally, an electromagnetic solenoid is installed in a sewing machine frame, and a release member is moved by connecting a release member to the electromagnetic solenoid.

[0003]

However, the above-mentioned conventional needle bar releasing device cannot be used for a zigzag sewing machine which reciprocates a needle bar base for supporting a needle bar up and down in a horizontal direction. is there. This is because the conventional device connects the release member to the actuator fixed to the sewing machine frame, and fixes the moving position of the release member. For this reason, in a configuration in which the needle bar base reciprocates in the left-right direction like a zigzag sewing machine, the release member cannot be moved to the vertical movement position of the engagement / disengagement mechanism depending on the position of the needle bar base. Can not release the needle bar.

[0004] A needle bar releasing device for a zigzag sewing machine according to the present invention solves the above-mentioned problems, and an object of the present invention is to make it possible to release a needle bar of a zigzag sewing machine.

[0005]

A needle bar releasing device for a zigzag sewing machine according to the present invention is provided with an engaging / disengaging mechanism for releasing the grip at a grip portion of a vertically moving arm that grips the needle bar and moves up and down. In a needle bar releasing device that releases the needle bar from vertical movement by moving the release member to the vertical movement position of the engagement / disengagement mechanism by an actuator to release the connection of the needle bar, the needle bar is supported to be vertically movable. In addition, the release member and the actuator are attached to a needle bar base that is reciprocated in the left-right direction.

In the above configuration, when the actuator attached to the needle bar base operates, the release member also attached to the needle bar base moves to the vertical movement position of the engagement / disengagement mechanism. When the engagement / disengagement mechanism contacts the release member, the connection of the engagement / disengagement mechanism is released. The actuator and the release member are both attached to the needle bar base, and move in the left-right direction integrally with the engagement / disengagement mechanism. Therefore, no matter where the needle bar moves due to the reciprocating movement of the needle bar base in the left-right direction, the release member is moved to the vertical movement position of the engaging and disengaging mechanism, and the release of the needle bar is executed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a zigzag sewing machine needle bar releasing device according to the present invention will be described below. FIG. 1 is a perspective view showing a main part of a zigzag sewing machine having a needle bar releasing device. The zigzag sewing machine generally has the following configuration. A needle bar crank 7 that moves up and down and that is connected to a balance crank 3 rotated by the upper shaft 1 via a crank pin 5 is connected to a needle bar 11 via an engagement / disengagement mechanism 9. The needle bar 11 is supported by a needle bar base 13 so as to be vertically movable. Therefore, in a state where the needle bar crank 7 and the needle bar 11 are connected by the engagement / disengagement mechanism 9,
The needle bar 11 moves up and down by the needle bar crank 7. The needle bar base 13 is swingably supported by support shafts 15 provided vertically on the sewing machine frame. A Z-axis connecting rod 17 is connected to an upper portion of the needle bar base 13. The Z-axis connecting rod 17 is connected to a zigzag generating mechanism (not shown), and swings the needle bar base 13 around the support shaft 15 in an arc-like locus in the Z direction, that is, in the left-right direction.

Next, the engagement / disengagement mechanism 9 will be described. The engagement / disengagement mechanism 9 mainly includes a slider 19, an engagement claw base 21, and an electromagnetic solenoid 2.
3. It comprises a release lever 25. The slider 19 is provided at the tip of the needle bar crank 7. This slider 19 is shown in FIG.
As shown in the front view of FIG.
Has an insertion hole 27 that is slidably inserted. An engagement groove 29 is formed on the front surface of the slider 19.

As shown in FIG. 1, the engagement claw base 21 is
Attach to 1. A tension spring 31 is stretched between the engagement claw 21 and the upper sewing machine frame. Tension spring 3
1 always urges the needle bar 11 upward. The needle bar 11
A needle bar stopper 33 is provided on the sewing machine frame above the upper side, and the upper limit position of the needle bar 11 urged by the tension spring 31 is regulated.

As shown in the front view of FIG. 5 and the left side view of FIG. 6, the engagement claw base 21 includes a base 35 and an engagement claw 37. The base 35 has an insertion hole 39 through which the needle bar 11 is inserted.
Having. The tip of the tightening screw 41 is exposed in the insertion hole 39. The base 35 is fixed to a predetermined position of the needle bar 11 by tightening the tightening screw 41. Bosses 43 and 45 are formed on the front side of the base 35. One end of the tension spring 31 described above is hooked on the hole 47 provided on the upper part of the one boss 43. A pin 49 extends horizontally below the bosses 43 and 45. An engaging claw 37 is swingably supported by the pin 49. The swinging direction of the engagement claw 37 is a direction that approaches or separates from the needle bar 11. A torsion spring 51 is attached between the base 35 and the engagement claw 37. Torsion spring 51
Urges the engagement claw 37 toward the needle bar 11 side. At the tip of the engaging claw 37, a claw portion 53 that fits and engages with the engaging groove 29 of the slider 19 is formed. An overhang 55 is formed on the left side surface of the engagement claw 37. This overhang 55 is shown in FIG.
As shown in FIG. Overhang 5
As shown in FIG. 6, the surface 57 of the needle bar base 5 is formed in an inclined surface approaching the needle bar toward the lower end.

The electromagnetic solenoid 23 is held by a solenoid holder 59 mounted on the needle bar base 13. The release lever 25 is provided with the caulking pin 6 on the solenoid holder 59.
1 is swingably supported. The release lever 25 has a substantially L-shape. Above the release lever 25, a suction plate 63 to be sucked by the electromagnetic solenoid 23 is formed. An inclined surface 65 is formed at the lower end of the release lever 25. The inclined surface 65 is configured so that the height from the needle bar base 13 side becomes higher from the lower end upward. A tension spring 69 extends between a lower portion of the release lever 25 and a lower portion 67 of the solenoid holder 59. The tensile force of the tension spring 69 is weaker than the operating force of the electromagnetic solenoid 23.

The zigzag sewing machine needle bar releasing device having the above-mentioned structure operates as follows. In a state where the electromagnetic solenoid 23 is not operated, as shown in FIG.
9, the release lever 25 is pulled, and the inclined surface 65 at the lower end of the release lever 25 is
Is out of the vertical movement position. In this state, the engagement claw 2
The claw portion 53 of the first engagement claw 37 is engaged with the engagement groove 29 of the slider 19.
Engages. Therefore, the needle bar crank 7 that moves up and down by the rotation of the upper shaft 1 and the needle bar 11 are connected, and the needle bar 11 moves up and down.

When the electromagnetic solenoid 23 is in operation, as shown in FIG. 2, the suction plate 63 above the release lever 25 is attracted against the pulling force of the tension spring 69. As a result of the release lever 25 swinging, the inclined surface 65 at the lower end of the release lever 25 moves to the vertical movement position of the projecting portion 55 of the engagement claw base 21. Therefore, when the needle bar 11 that has been moved up and down so far rises next time, the inclined surface 6 of the release lever 25 is moved.
5, the projection 55 rides on, and the claw 53 of the engagement claw 37 is disengaged from the engagement groove 29 of the slider 19. Then, since the engagement claw base 21 is pulled upward by the tension spring 31, the needle bar 11 is held at the upper limit position in contact with the needle bar stopper 33. The slider 19 slides up and down on the needle bar 11 due to the vertical movement of the needle bar crank 7, and does not move the needle bar 11 up and down.

When the operation of the electromagnetic solenoid 23 stops,
Since the release lever 25 is pulled back by the tension spring 69, the inclined surface 65 of the release lever 25 comes off from under the overhanging portion 55 of the engaging claw 37. Then, the slider 19 moves up next, and the engagement groove 29 of the slider 19 is moved to the claw portion 53 of the engagement claw 37.
Is reached, the claw portion 53 is engaged with the engagement groove 29. In this way, the slider 19 and the engagement claw base 21 are connected again to the state shown in FIG. 1, and thereafter, the needle bar 11 is moved up and down by the up and down movement of the needle bar crank 7.

According to the needle bar releasing device of the zigzag sewing machine described above, since the electromagnetic solenoid 23 and the release lever 25 are attached to the needle bar base 13, the needle bar base 13 has the Z
Even when the shaft connecting rod 17 reciprocates in the left-right direction around the support shaft 15, the release lever 25 is disposed at the vertical movement position of the overhang portion 55, so that the needle bar 11 can be released.

Although the embodiment has been described above, the present invention is not limited to the embodiment at all, and various embodiments may be made without departing from the spirit of the present invention, such as a configuration in which an actuator other than an electromagnetic solenoid is applied. Of course, it can be implemented in

[0017]

As described above in detail, according to the needle bar releasing device of the zigzag sewing machine of the present invention, since the actuator and the release member are mounted on the needle bar base, even if the needle bar base reciprocates in the left-right direction. Thus, there is an effect that the release member is disposed at the vertical movement position of the engagement / disengagement mechanism and the needle bar can be released.

[Brief description of the drawings]

FIG. 1 is a perspective view of a needle bar releasing device of a zigzag sewing machine as one embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the needle bar releasing device has released the needle bar.

FIG. 3 is a front view of a crank rod.

FIG. 4 is a left side view of the crank rod.

FIG. 5 is a front view of the engagement claw mechanism on the needle bar side.

FIG. 6 is a left side view of the engagement claw mechanism on the needle bar side.

FIG. 7 is a front view of the opening member driving mechanism.

FIG. 8 is a right side view of the opening member driving mechanism.

[Explanation of symbols]

1 ... Upper shaft, 3 ... Balance crank, 7 ...
Needle bar crank, 9 ... disengagement mechanism, 11 ... needle bar,
13: Needle bar base, 15: Support shaft, 17 ...
Z-axis connecting rod, 19: slider, 21: engaging claw stand, 23: electromagnetic solenoid, 25: release lever,
37: engaging claw, 55: overhang

Claims (1)

(57) [Claims] An up-and-down movement arm that grips the needle bar and moves up and down is provided with an engagement / disengagement mechanism for releasing the grip, and the release member is moved by an actuator to a vertical movement position of the engagement / disengagement mechanism, and In a needle bar releasing device for releasing the connection of the engagement / disengagement mechanism and releasing the needle bar from the vertical movement, the release member is provided on the needle bar base that reciprocates in the left and right direction while supporting the needle bar in a vertically movable manner. A needle bar releasing device for a zigzag sewing machine, comprising the actuator and the actuator.