JPH1015269A - Needle clamp holding device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dropping off of a needle clamp from a needle bar. SOLUTION: In a sewing machine where a needle bar 1 that moves vertically, a needle 21 and a pin 22 for prevention of turning are formed as one body and which is equipped with a needle clamp 2 inserted and fastened to the needle bar 1, this needle holding device is installed movably to the needle bar 1 and it is equipped with a moving part 3 as a fastener which fastens the needle clamp with an aid of the pin hole 31 to fasten the pin 22 for prevention of the needle clamp to turn, and a releasing part 4 which release fastening of the pin 22 and the pin hole 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sewing machine provided with a needle bar which moves up and down, a needle and a pin for preventing rotation, which are integrally formed, and which is inserted and locked by the needle bar. The locking member provided on the needle bar and formed with a locking portion for locking a pin for preventing rotation of the needle stud is provided via the rotation preventing pin when the needle bar moves up and down. The present invention relates to a needle stock holding device for a sewing machine that locks the needle stock to prevent the needle stock from falling off from the needle bar.

[0002]

2. Description of the Related Art A conventional needle holder for a sewing machine is shown in FIG.
In a sewing machine having a needle bar B that moves up and down and a needle K which is integrally formed with a needle and a pin for preventing rotation and which is inserted into and locked by the needle bar B, as shown in FIG. Two engagement pins KP sandwiched by a horseshoe-shaped leaf spring I
Is inserted, the constricted portion W at the tip of the needle stock K is inserted between the engagement pins KP, and is locked by the urging force of the horseshoe-shaped leaf spring I.

[0003]

In the above-mentioned conventional needle holder holding device, the constricted portion W of the needle holder K is interposed between the engaging pins KP, and the horseshoe-shaped leaf spring I is provided. Since the needle is locked by the urging force, the force in the direction of pulling down the needle stump K when the needle is pulled out from the fabric after the needle is stabbed in the fabric is smaller than the urging force of the horseshoe-shaped leaf spring I. If it becomes large, there is a problem that the needle stock K comes off the needle bar B during sewing.

If the urging force of the horseshoe-shaped leaf spring I is increased in order to prevent the needle stud K from coming off from the needle bar B during the sewing, the needle stud K is attached and detached when the needle stud K is replaced. This increases the required force and reduces the workability.

The inventor of the present invention provided a pin for preventing rotation of the needle stud, which is disposed on the needle bar separately from the steel ball clamped by a horseshoe-shaped leaf spring inserted in the needle bar. Focusing on the technical idea of the present invention, wherein the locking member formed with a locking portion for locking locks the needle stud via the rotation preventing pin when the needle bar moves up and down, Through further research and development, the present invention has been accomplished to achieve the object of preventing the needle stock from falling off the needle bar.

[0006]

According to a first aspect of the present invention, a needle holder for a sewing machine according to the present invention comprises a needle bar which moves up and down, a needle and a pin for preventing rotation. A sewing machine having a needle bar inserted and locked by the needle bar, wherein a locking portion is formed on the needle bar and locks a pin for preventing rotation of the needle bar. And a locking member for locking the needle stud via the rotation preventing pin when the needle moves up and down.

According to a second aspect of the present invention, in the needle holding device for a sewing machine according to the first aspect, the locking member is arranged to be swingable on the needle bar, and the needle is provided. A locking hole for locking a pin for preventing rotation of the stock is formed, and a swing member is provided for locking the needle stock via the rotation preventing pin when the needle bar moves up and down. .

According to a third aspect of the present invention, in the second aspect of the present invention, the oscillating member includes a spring member, and the oscillating member includes a spring member for preventing rotation of the staple. The pin is configured to be urged in a direction in which the pin is inserted and locked in the locking hole.

According to a fourth aspect of the present invention, in the second aspect of the present invention, in the second aspect of the invention, the swinging member comprises a spring member, and the swinging member comprises a spring member for preventing rotation of the needlestock. The pin is configured to be urged in a direction in which the pin is inserted and locked in the locking hole.

According to a fifth aspect of the present invention, in the sewing machine according to the first aspect, the release member for releasing the locking relationship between the rotation preventing pin and the locking portion is provided. It is provided with.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, in the sewing machine according to the fifth aspect, the release member is provided on a needle holder having a groove for gripping the needle. It is provided with a projecting member interposed between the locking member and the needle stock when the needle stock is replaced.

[0012] In the needle holder holding device for a sewing machine according to the present invention (a seventh invention according to a seventh aspect), in the fifth invention, the protruding member is configured so that the rotation preventing pin and the locking portion are locked. The pin is configured by a pin having a tapered tip for canceling.

(Function) In the sewing machine needle holding device according to the first aspect of the present invention, a needle bar that moves up and down, a needle and a pin for preventing rotation are integrally formed, and the needle bar is inserted into the needle bar and engaged. In a sewing machine having a needle bar to be stopped, a locking portion for locking a pin for preventing rotation of the needle bar is formed, and the locking member disposed on the needle bar moves the needle bar up and down. Then, the needle stud is locked via the rotation preventing pin.

A second aspect of the present invention is a sewing machine according to the first aspect, wherein the needle stock holding device is swingably disposed on the needle bar constituting the locking member, and is configured to prevent rotation of the needle stock. The rocking member having a locking hole for locking the pin is formed,
When the needle bar moves up and down, the needle bar is locked via the rotation preventing pin.

According to the third aspect of the present invention, in the second aspect of the invention, the swing member includes the spring member, and the pin for preventing rotation of the needle stud is provided. It is inserted in the locking hole and urged in a direction to be locked.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the rocking member is formed of the spring member, and the pin for preventing rotation of the needle is connected to the engaging member. It is urged in the direction in which it is inserted and locked in the stop hole.

According to a fifth aspect of the present invention, in the sewing machine needle holding device according to the first aspect, the releasing member releases the locking relationship between the rotation preventing pin and the locking portion. .

According to a sixth aspect of the present invention, in the sewing machine needle holding device of the sixth invention, the needle holding base provided with a groove for holding the needle stock constituting the release member is provided. A protruding member is inserted between the locking member and the needle stock when the needle stock is replaced, and the locking relationship is released.

According to the seventh aspect of the present invention, in the sewing machine needle holding device according to the fifth aspect of the present invention, the pin having a tapered distal end constituting the projecting member may be formed by the rotation preventing pin and the locking portion. This releases the locking relationship.

[0020]

According to the first aspect of the present invention, the locking member locks the rotation preventing pin by the locking portion when the needle bar moves up and down. Thus, since the needle stock is locked, the drop of the needle stock from the needle bar is prevented.

According to a second aspect of the present invention, in addition to the effects of the first aspect, the swing member has
Since the pin for stopping rotation of the needle stock is locked by the locking hole to lock the needle stock, there is an effect that the drop of the needle stock from the needle bar is surely prevented.

According to a third aspect of the present invention, in addition to the effect of the second aspect, the spring member disposed on the swing member is provided with the spring member for preventing rotation of the needle shaft. Since the pin is urged in the direction in which the pin is inserted and locked in the locking hole, it is possible to more reliably prevent the needle bar from falling off from the needle bar.

According to the fourth aspect of the present invention, in addition to the effects of the second aspect, the swinging member is constituted by the spring member. Since the pin is urged in the direction in which the pin is inserted and locked in the locking hole, an effect is obtained that the needle stud is more reliably prevented from falling off from the needle bar.

According to a fifth aspect of the present invention, a stitch holding device for a sewing machine having the above function is provided, in addition to the effects of the first invention, wherein the release member is
Since the locking relationship between the rotation preventing pin and the locking portion is released, there is an effect that the needle stock can be easily attached and detached when replacing the needle stock.

According to the sixth aspect of the present invention, in addition to the effects of the fifth aspect, the needle holder holding device of the sewing machine having the above-described operation is provided on a needle holder having a groove for gripping the needle holder constituting the release member. The inserted protruding member is inserted between the locking member and the needle bar when the needle bar is inserted into the groove for gripping the needle bar at the time of replacement of the needle bar. Is released, so that there is an effect that detachment according to the movement of the needle stock at the time of replacement of the needle stock is enabled.

According to a seventh aspect of the present invention, in addition to the effect of the fifth aspect, the pin having a tapered tip constituting the projecting member is provided with the pin for preventing rotation and the locking. Since the locking relationship with the part is released, there is an effect that, with a simple configuration, detachment according to the movement of the needle stock at the time of replacement of the needle stock is enabled.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are described below.
This will be described with reference to the drawings.

(First Embodiment) As shown in FIGS. 1 to 6, a needle holder 1 of a sewing machine according to a first embodiment comprises a needle bar 1 which moves up and down, a needle 21 and a pin 22 for preventing rotation. In a sewing machine having a needle stud 2 formed and interposed and locked by the needle bar 1, a pin 22 for rotatably disposed on the needle bar 1 and for preventing rotation of the needle stud 2 is provided. A rocking member 3 serving as a locking member for locking the needle stud via the rotation preventing pin when the needle bar moves up and down, and a locking hole 31 for locking is formed; A release member 4 for releasing the locking relationship between the pin 22 and the locking hole 31 is provided.

The needle bar 1 is formed of a cylindrical body 10 as shown in FIGS. 1 to 5, and two steel balls 12 are inserted into a small diameter portion 11 at a lower portion to clamp the steel balls 12. A horseshoe-shaped leaf spring 13 is provided (see FIG. 3), and a pin 22 for preventing rotation of the needle bar 2 is inserted into a lower end portion 15 in which a cylindrical concave portion 14 is formed below the small diameter portion 11. A slit 16 is formed.

As shown in FIGS. 1 to 10, the needle bar 2 has a constricted portion 24 formed between the two steel balls 12 at the small-diameter upper end portion 23 and a rotation preventing portion at the lower end. The pin 22 is projected by press-fitting and fixed, and a conical portion 25 is provided below the small-diameter upper end portion 23. Large-diameter portion 26 on which parallel grip portion 261 to be gripped is formed
The needle 21 having a tapered tip 212 having a threading hole 211 formed below the large diameter portion 26 is coaxially arranged.

As shown in FIGS. 1 to 10, the swing member 3 penetrates and projects from a parallel portion 17 formed by piercing the upper side wall of the small diameter portion 11 of the needle bar 1. A support portion 32 that engages with the pin portion 18 as a swing fulcrum, and a main body portion 30 that extends vertically along the outer peripheral wall of the needle bar 1
And a U-shaped spring formed integrally with the upper portion of the main body 30 and having a tip abutting against the outer peripheral wall of the needle bar 1 to apply an urging force to swing the main body 30 clockwise. Part 33
A circular locking hole 31 formed at a lower portion of the main body 30 and into which a pin 22 for preventing rotation is inserted;
A projecting portion 34, which is provided obliquely at the upper part of the locking hole 31 and is obliquely provided to realize swinging when the needle holder 5 is moved in the lateral direction, and a lower portion at the lower end of the body 30. And a lower end protruding portion 35 which is provided obliquely and is arranged obliquely and realizes swinging at the time of the downward movement of the needle bar 2.

As shown in FIGS. 1 to 10, the release member 4 is disposed on the needle holder 5 having a groove 51 for gripping the needle stud 2. It is constituted by a pin 41 having a tapered tip for releasing the locking relationship between the rotation preventing pin as a protruding member inserted between the member and the needle stud and the locking hole 31.

The pin 41 is supported at its center by a support member 42 implanted in the needle holder 5, and is formed by drilling from both sides of the needle holder 5 to hold the needle stock 1. 51 is disposed in parallel with the longitudinal axis of the rod 51, and when the needle bar 2 enters the groove 51, the projecting portion 34 of the swinging member 3 is formed.
And the outer peripheral wall of the needle bar 1 so as to release the locking relationship between the rotation preventing pin 22 and the locking hole 31.

The operation of the needle holder holding device for a sewing machine according to the first embodiment having the above-described configuration will be described below with reference to FIGS. As shown in FIG. 8, the needle bar 1 on which the swing member 3 is swingably disposed is lowered to the needle stud 2 inserted and gripped in the groove 51 of the needle holding base 5.

Before the needle bar 2 is completely inserted into the needle bar 1, the lower end protruding portion 35 of the swing member 3 comes into contact with the pin 41 provided on the needle holder 5. Then, the swing member 3 is swung counterclockwise.

As shown in FIG. 9, when the needle bar 2 is completely inserted into the needle bar 1, the needle bar 2 is inserted into the opposite steel ball 12 inserted in the needle bar 1. The constricted part 24 of the upper end part 23 is inserted, and the horseshoe-shaped leaf spring 13 is inserted.
The needle stud 2 is locked by the spring force of. The swinging member 3 slidably provided on the needle bar 1 is located at a position where it does not come into contact with the pin 22 fixedly pressed into the needle bar 2 by the pin 41 provided on the needle holder 5. Rocked counterclockwise until

In a state where the needle bar 2 is completely inserted into the needle bar 1 and the needle bar 2 is locked by the steel ball 12 and the horseshoe-shaped leaf spring 13 of the needle bar 1,
When the needle holder 5 moves in the axial direction of the pin and the needle bar 2 is released from the groove 51 of the needle holder 5, the swinging member 3 of the needle bar 1 also comes into contact with the pin 41. Is released.

When the swinging member 3 is released from the contact with the pin 41, the swinging member 3 is integrally formed on the upper portion of the main body 30 of the swinging member 3 and the tip is formed on the outer peripheral wall of the needle bar 1. The U-shaped spring portion 33 abutted causes the swinging member 3 to swing clockwise by the urging force, so that the pin 22 protruding from the slit 16 of the needle bar 1 causes the swinging of the pin 22. The needle bar 2 is inserted into a locking hole 31 formed in the lower part of the moving member 3, and the needle bar 2 is locked to the needle bar 1 as shown in FIG.

When removing the needle stock 2, the needle holder 5
Moves in the axial direction of the pin 41, and the needle stud 2 is inserted into the groove 51 and gripped. At this time, the swing member 3
The protruding portion 34, which is protruded in the lateral direction above the locking hole 31 and is obliquely disposed, comes into contact with the tip of the pin 41 and starts swinging in a counterclockwise direction. When the stock 2 is completely inserted and gripped in the groove 51, the pin 22 of the needle stock 2 is completely removed from the locking hole 31 of the swing member 3.

Therefore, the lock between the needle bar 1 and the needle bar 2 is released, and the needle bar 2 is locked to the needle bar 1 only by the spring force of the steel ball 12 and the horseshoe-shaped leaf spring 13. State. In this state, when the needle bar 1 moves upward, the needle bar 2 is detached from the needle bar 1.

The needle holder holding device of the sewing machine according to the first embodiment, which has the above-described operation, is characterized in that the swing member 3 serving as the locking member is provided.
However, when the needle bar 1 moves up and down, the locking portion constituted by the locking hole 31 locks the pin 22 for preventing rotation and locks the needle stud 2. 2 has the effect of preventing the needle bar 1 from falling off.

Further, in the needle holding device of the sewing machine according to the first embodiment, the swing member 3 locks the pin 22 for preventing rotation of the needle 2 by the locking hole 31 so that the needle 22 Since the stock 2 is locked, there is an effect that the drop of the needle stock 2 from the needle bar 1 is reliably prevented.

Further, in the needle holding device of the sewing machine according to the first embodiment, the spring portion 33 provided on the swing member 3 is
The pin 22 for preventing rotation of the stylus 2 is
Since the needle rod 2 is urged in the direction in which it is inserted and locked in the needle bar 1, it is possible to more reliably prevent the needle bar 2 from falling off from the needle bar 1.

Further, in the needle holding device of the sewing machine according to the first embodiment, the release member constituted by the pin 41 is
Since the lock between the rotation preventing pin 22 and the locking portion is released, there is an effect that the needle stock 2 can be easily attached and detached when the needle stock 2 is replaced.

Further, in the needle holding device for a sewing machine according to the first embodiment, the projecting member provided on the needle holding base 5 in which the groove 51 for gripping the needle forming the release member is formed is provided. The needle stock 2 is replaced by the needle stock 2 when the needle stock is replaced.
Is inserted between the swinging member 3 and the needle stud when the needle stud is gripped, and the lock is released. This has the effect of enabling attachment and detachment according to the conditions.

The needle holding device of the sewing machine according to the first embodiment is characterized in that the pin 4 having a tapered tip constituting the projecting member is provided.
1 releases the locking relationship between the rotation-preventing pin 22 and the locking hole 31, and with a simple configuration, enables the detachment according to the movement of the needle stump when replacing the stylus. This has the effect.

That is, a simple design in which a swing member 3 is attached to the needle bar 1 to lengthen the pin 22 for preventing rotation of the needle bar 2 and a pin 41 is attached to the needle holder 5. By the change, the lock of the needle stock 2 is realized.

(Second Embodiment) In a needle holding device for a sewing machine according to a second embodiment, as shown in FIGS. 11 and 12, the rocking member 3 is attached to the needle bar 1 with a screw at one end. The pin 22 for preventing rotation of the needle stud is urged in a direction inserted and locked in the locking hole 38, and is elastic when the needle stud 2 is replaced. The point that is configured to swing by deformation is the first
This is a main difference from the embodiment.

As shown in FIG. 11, for example, the swinging member 3 cuts a part of a skirt-shaped member 36 which gradually spreads downward as shown in FIG. A locking hole 38 for inserting the pin 22 is formed in a lower portion, and a pin 43 as a release member provided on the needle holder 5 is integrally formed as shown in FIG.

In the needle holding device for a sewing machine according to the second embodiment having the above structure, the swing member 3 is constituted by the skirt-shaped spring member 36. A pin 22 is inserted into the locking hole 38 to lock the needle bar 2 to the needle bar 1 and, when the needle bar 2 is replaced, swings due to the elastic deformation of the skirt-shaped spring member. Things.

In the needle holding device of the sewing machine according to the second embodiment, the skirt-shaped spring member constituting the swinging member 3 locks the pin 22 for preventing rotation of the needle. Since the needle bar 2 is urged in the direction in which it is inserted and locked in the hole 38, it is possible to more reliably prevent the needle bar 2 from falling off from the needle bar 1.

Further, in the needle holder holding device of the sewing machine according to the second embodiment, the skirt-shaped spring member 36 having one end fixed to the needle bar 1 is attached to and detached from the needle holder when the needle holder 2 is replaced. Since the needle stock 2 is rocked by the deformation, it has an effect that the needle stock 2 can be attached and detached with a simple member.

Further, the needle holder holding device of the sewing machine according to the second embodiment is constituted by the skirt-shaped spring member 36 which gradually spreads the swinging member 3 downward.
This has the effect of facilitating contact with the pin 44 and elastic deformation.

The above-described embodiment has been described by way of example only, and the present invention is not limited to the embodiment. Modifications and additions are possible without departing from the technical idea of the present invention.

In the second embodiment, as an example, from the viewpoint of facilitating contact with the pin 41 and elastic deformation, the skirt-shaped spring member gradually widens as the swing member 3 moves downward. However, the present invention is not limited thereto, and the rocking member 3 may be secured from the viewpoint of the locking state between the pin for preventing rotation of the needle stud and the locking hole and the locking state. It is possible to use a member that gradually narrows as it goes down.

In the above-described embodiment, the locking hole 31 is used as an example of the locking portion from the viewpoint of locking reliability. However, the present invention is not limited to these, and the present invention is not limited thereto. From the viewpoint, for example, an L-shaped notch is formed in the direction in which
It is also possible to adopt a swinging member for the hook-shaped member in the shape of a letter.

[Brief description of the drawings]

FIG. 1 is a rear perspective view showing a needle stock holding device of a sewing machine according to a first embodiment of the present invention.

FIG. 2 is a front perspective view showing a needle holder device of the sewing machine according to the first embodiment.

FIG. 3 is a cross-sectional view showing a small diameter portion of the needle bar of the first embodiment.

FIG. 4 is a partially enlarged view showing a positional relationship between a needle bar and a needle stock and a release member according to the first embodiment.

FIG. 5 is a plan view showing a positional relationship between a needle bar and a needle stock and a release member according to the first embodiment.

FIG. 6 is a cross-sectional view showing a support portion of the swing member in the needle bar of the first embodiment.

FIG. 7 is a side view showing a positional relationship at the top dead center of the needle bar in the first embodiment.

FIG. 8 is a side view showing a positional relationship in a down state of the needle bar in the first embodiment.

FIG. 9 is a side view showing a positional relationship in a state where the lowering of the needle bar is completed in the first embodiment.

FIG. 10 is a side view showing a positional relationship in a locked state of the needle stud in the first embodiment.

FIG. 11 is a rear perspective view showing a swinging member in the needle holder holding device of the sewing machine according to the second embodiment of the present invention.

FIG. 12 is a front perspective view showing a release member according to the second embodiment.

FIG. 13 is a sectional view showing an engagement relationship between a needle bar and a needle stock in a conventional needle stock holding device of a sewing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Needle bar 2 Needles 21 Needle 22 Pin for stopping rotation 3 Swinging member 31 Locking hole 4 Release member

Claims (7)

[Claims] 1. A sewing machine comprising a needle bar which moves up and down, a needle, and a pin for preventing rotation, which is integrally formed, and has a needle bar inserted and locked by the needle bar, wherein the sewing machine is provided with the needle bar. And a locking member for locking a pin for preventing rotation of the needle stud, and a locking member for locking the needle stud via the rotation preventing pin when the needle bar moves up and down. A needle holder for a sewing machine. 2. The needle bar according to claim 1, wherein the locking member is swingably disposed on the needle bar, and has a locking hole for locking a pin for preventing rotation of the needle bar. A needle holding device for a sewing machine, comprising: a swinging member that locks the needle through the rotation preventing pin when the needle moves up and down. 3. The swinging member according to claim 2, wherein the swinging member includes a spring member, and the pin for preventing rotation of the needle stud is urged in a direction inserted and locked in the locking hole. A needle holding device for a sewing machine, characterized in that the device is configured as follows. 4. The swinging member according to claim 2, wherein the rocking member is formed of a spring member, and the pin for preventing rotation of the needle stud is urged in a direction inserted and locked in the locking hole. A needle holding device for a sewing machine, characterized in that the device is configured as follows. 5. The needle holder device for a sewing machine according to claim 1, further comprising a release member for releasing a locking relationship between the rotation preventing pin and the locking portion. 6. The needle holder according to claim 5, wherein the release member is provided on a needle holding base having a groove for gripping the needle holder, and between the locking member and the needle holder when replacing the needle holder. A needle holder for a sewing machine, comprising a protruding member inserted into the needle holder. 7. The sewing machine according to claim 5, wherein the projecting member is constituted by a pin having a tapered tip for releasing a locking relationship between the rotation preventing pin and the locking portion. Needle holding device.