JP2004121280A - Needle clamp device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe and secure needle clamp device of a sewing machine capable of easily changing, attaching, and detaching a needle without using a tool such as a screw driver. <P>SOLUTION: The operation of the needle clamp is easy since the attaching/detaching of the needle is operated only by the upward/downward operation of an operation lever, and the operation lever can be formed long since a hinge is attached to the operation lever to make it foldable. Further, the needle can be firmly attached with a strong pressing force, and the operation lever does not hinder the sewing operation as the operation lever is stored along a needle clamp body when the hinge is closed. Accordingly, the highly safe needle clamp device can be provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a needle stop device of a sewing machine that enables replacement, switching, and detachment of a needle without a tool such as a screwdriver.
[0002]
[Prior art]
2. Description of the Related Art An example of such a conventional sewing machine needle stop device is described in Japanese Utility Model Publication No. 2-26452.
This is because the needle is locked by inserting the needle from below into the L-shaped cam lever in the needle stopper main body, and to release the needle, the outwardly protruding release operation rod is moved and this release operation rod is used. The needle is released by manually rotating the locked cam lever.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 2-26452
[Problems to be solved by the invention]
However, the above-mentioned needle stopper device is troublesome because the needle opening operation is performed in two steps, and the number of parts is large.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a safe and secure needle stop device for a sewing machine, in which a needle can be detached with a simple operation.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a needle stop device for a sewing machine according to claim 1 of the present invention is a needle stop body fixed to a lower end of a needle bar, and an upper portion of the sewing needle is inserted from a lower end of the needle stop body. In the needle stopper device of the sewing machine, which is fixed in the needle stopper body, the needle stopper is disposed on the front side of the needle stopper body opposite to the needle support portion in the needle stopper body that supports the upper back surface of the sewing needle, A needle fixing member having a needle position that can be moved to a clamp position for pressing the upper part of the needle against the needle support portion and a non-clamp position for releasing the needle, and a passive portion on the base end side, The part is a shaft supporting part that is rotatably supported upward or downward with respect to the needle stopper body, one end is an action part that can be brought into contact with and separated from the needle fixed body, and the other end is via a hinge. And an operation lever provided with an operation unit that can be opened and closed. When the handle is closed, the operating portion is locked along the needle stopper main body, and when the hinge is opened and the operating portion is operated up and down to rotate the shaft support portion in one direction or another direction, the action portion is activated. The fixed needle body can be moved to a clamp position or a non-clamp position.
[0007]
The needle stop device of the sewing machine according to the first aspect of the present invention can easily perform the operation of attaching and detaching the needle with only the operation lever, and the operation lever is provided with a hinge so that the operation lever can be folded. The needle can be attached firmly with a strong pressing force, and the operation lever is stored along the needle stopper body when the hinge is closed, so it does not interfere with sewing and has a highly safe needle stopper device. Has the effect of doing
[0008]
According to a second aspect of the present invention, when the operation lever is closed and the operation portion is locked along the needle stopper main body, the distal end thereof is passed through the needle hole. It becomes the yarn guide of the.
In the needle stopper device of the sewing machine according to the second aspect, the operation lever is also used as the thread guide for the needle thread, so that the number of parts can be reduced, and there is an effect of contributing to cost reduction.
[0009]
Further, in the needle holding device of the sewing machine according to claim 3 of the present invention, the needle fixing body is configured such that the intermediate portion is rotatably supported by the needle holding body so as to be rotatable about a horizontal rotation axis, A clamp position for clamping the upper part of the needle between the one end portion and the needle support portion by the rotation of the intermediate portion of the needle fixed body, and a needle stopper that is movable to a non-clamp position for releasing the needle, The other end of the needle fixing body is provided with a passive part which is brought into contact with the action part, and the needle stopper of the needle fixing body clamps or opens the needle by the up and down rotation operation of the operation part. is there.
[0010]
According to the needle stopping device of the sewing machine of the third aspect, since the needle fixing body is rotated to move and fix the needle stopping portion above the needle, the pressing force for fixing the needle can be increased, and the needle can be securely fixed. There is an effect that can be fixed to the needle bar.
[0011]
Further, in the needle holding device of the sewing machine according to the present invention, the needle fixed body is supported by the needle holding body so as to be slidable substantially linearly, and one end of the needle fixed body is moved by the sliding of the needle fixed body. A needle stopper which is movable between a clamp position for clamping the upper part of the needle between the support part and a non-clamp position for releasing the needle, and a passive part whose other end is pressed by the operating part of the operating lever The needle fixing body slides by the vertical operation of the operation unit, and the needle stopper clamps or opens the needle.
In the needle stopping device of the sewing machine according to the fourth aspect, since the needle fixing body is slidably moved substantially linearly, there is an effect that the size of the needle stopping device can be reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a needle stopper device of a sewing machine according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a needle stopper device of a sewing machine according to the present invention, FIG. 2 is a front view of a main part when a needle fixing body clamps a needle, FIG. 3 is a side view of FIG. 2, and FIG. It is a principal part front view when a needle fixing body opens a needle.
[0013]
The needle stop device of the sewing machine shown in FIGS. 1 to 4 removably locks the needle 1 on a needle support portion 2 formed at the lower end of a needle bar 1 that reciprocates up and down a fixed path. Reference numeral 4 denotes a needle stopper body as a machine frame for locking the needle 1 to the needle bar 1, and the needle stopper body 4 is fixed to the upper opening 5 through a lower end of the needle bar 1 with a mounting screw 6.
[0014]
At the lower end of the needle bar 1 is formed a needle support portion 2 having a concave portion on the side where the needle 3 is mounted, and the needle support portion 2 protruding into the lower opening 7 of the needle stopper body 4 is provided with the upper portion of the needle 3. By inserting the needle 3 with its back facing, the upper end of the needle 3 is attached to a position where it comes into contact with the positioning pin 2a provided on the needle support.
[0015]
Reference numeral 8 denotes a needle fixed body made of a substantially L-shaped elastic member disposed inside the upper opening 5 of the needle stopper body 4 and on the front side facing the needle support 2 of the needle bar 1. . The needle fixing body 8 is fixed to the needle stopper main body 4 so as to be rotatable around a horizontal rotation axis by a stepped screw 10 at the intermediate rotating portion 9, and further, the distal end side is folded into a substantially V-shape. The needle stopper 11 is formed in a curved shape, and a clamp position A where the needle stopper 11 presses the upper part of the needle 3 against the needle support part 2 by the rotation of the rotating part 9 and a non-clamp which releases the needle 3 It is possible to move to the position B. The proximal end side of the needle fixing body 8 is a passive section 12 on which an operation lever described later is provided so as to be able to contact and separate therefrom and the intermediate section rotates.
[0016]
Reference numeral 13 denotes a stopper pin provided on the needle stopper body 4 and projected so as to be locked when the needle fixing body 8 is rotated to the non-clamp position. Further, a stopper pin projecting so as to be locked when the needle fixing body 8 is rotated to the clamp position is not shown.
[0017]
Reference numeral 20 denotes an operation lever. An intermediate portion of the operation lever 20 includes a shaft support portion 22 supported by a stepped screw 21 so as to be rotatable with respect to the needle stopper main body 4 about a horizontal rotation axis. One end of the operation lever 20 is an action portion 23 that can be brought into contact with and separated from the passive portion 12 of the needle fixed body, and the other end is provided with a long operation portion 25 via a hinge 24. The operation unit 25 is rotatable around the stepped screw 21 to an upper position (C in FIG. 1) or a lower position (D in FIG. 1).
[0018]
When the operation unit 25 moves from the lower position (D in FIG. 1) to the upper position (C in FIG. 1), the action unit 23 rotates the needle fixed body 8 counterclockwise as shown in FIGS. When the needle 3 is moved to the lower position (D in FIG. 1), the needle fixing body 8 is rotated clockwise to open the needle 3 as shown in FIG.
[0019]
The hinge 24 allows the operating portion 25 to move to a bent position (reference numeral E in FIG. 1) and an open position (reference numeral F in FIG. 1) which are held by the holding portions 26, 26 along the needle stopper body 4. Further, the operating portion 25 is normally urged to the bending position (symbol E) by a coil spring 27 wound around the hinge 24. When the operating portion 25 is operated from the bending position (E in FIG. 1) to the open position (F in FIG. 1), the shaft support portion 22 moves to the upper position (C in FIG. 1) with respect to the needle stopper body 4. It has been placed.
[0020]
In the above-described configuration, the action of contacting / separating the action portion 23 of the operation lever 20 and the shaft support portion 22 of the needle fixing body 8 will be described in detail. FIG. 2 shows a state where the needle 3 is locked by the needle fixing body 8. At this time, with respect to a line connecting the stepped screw 21 of the shaft support 22 and the center of the stepped screw 10 of the needle fixing body 8, an upper protruding portion 23 a that makes contact between the action portion 23 and the shaft support 22, The contact points of the lower projections 23b are abutted and fixed at angles of + α and −α, respectively. Therefore, even if the needle moves up and down during sewing of the sewing machine, the contact between the action portion 23 and the shaft support portion 22 does not come off, and the rotational position of the needle fixing body 8 does not shift.
[0021]
FIG. 4 shows a state where the needle 3 is released from the needle fixing body 8, and the needle 3 is moved from the upper position C to the lower position D of the operating portion 25 from below the action portion 23 shown in FIG. When the open arm 23c extending below the passive portion 12 of the fixed body 8 rises, and the passive portion 12 is rotated clockwise against the provision of the upper projection 23a and the lower projection 23b, the action portion 23 is rotated. The contact between the upper projection 23a and the lower projection 23b of the passive unit 12 is released, whereby the needle stopper 11 is released from the needle 3 and the needle 3 is opened.
[0022]
At this time, since the passive portion 12 rotates clockwise and stops upon hitting the stopper pin 13, the distal end of the open arm 23 c abuts on the needle fixing body 8 and stops at the lower position D of the operation lever 20. .
[0023]
As shown in FIG. 4, when the distal end portion of the open arm 23c is locked to the needle fixing body 8 when the needle is released, the upper projection 23a and the lower projection 23b of the action section 23 are connected to the needle fixing body. 8 are disposed above the passive unit 12. Here, when the operation unit 25 is pulled up again from the lower position D to the upper position C, the upper projection 23a and the lower projection 23b of the operation unit 23 are lowered to abut on the passive unit 12, and the passive unit 12 is lowered. The needle shown in FIG. 2 is fixed.
[0024]
Here, as shown in FIG. 1, when the operation portion 25 of the operation lever 20 is closed and this operation portion 25 is locked along the needle stopper main body 4, as shown in FIG. The distal end portion 25a can serve as a thread guide for the needle thread 29 passed through the balance 28 and the needle hole of the needle 3. Thus, the number of components can be reduced, and the operation unit 25 can be easily gripped by the operator when the operation unit 25 is moved to the open position F.
[0025]
Next, a second embodiment of the needle stopper device of the sewing machine according to the present invention will be described.
FIG. 6 shows a second embodiment of the needle fixing body disposed on the needle stopper main body 4. The configuration of the operation lever 20 other than the working portion abutting on the needle fixing body is the same as that of the first embodiment. Description is omitted because it is common.
[0026]
The needle stopper body 4 is fixed to the needle bar 1 with mounting screws 6, and the upper back of the needle 3 is inserted from below the needle stopper body 4 into the needle support part 2 formed at the lower end of the needle bar 1. The needle 3 is disposed at a position where the upper end of the needle 3 abuts the positioning pin 2a provided on the second needle 2.
[0027]
The needle fixing body 30 has a cam pin 31 as a needle stopper at one end, and a passive section 32 pressed by the operating part 23 of the operation lever 20 at the other end. The cam pin 31 and the passive portion 32 are integrally formed, and are supported in the needle stopper body 4 so as to be slidable substantially linearly. By this sliding, the cam pin 31 reciprocates between a clamp position where the upper portion of the needle 3 is clamped between the needle support 2 and the non-clamp position where the needle is released.
[0028]
Further, a spring 33 supported by a stepped screw 32 provided on the needle stopper body 4 is mounted on the cam pin 31, and the cam pin 31 is always urged to the non-clamp position by the spring 33.
When the operation portion 25 of the operation lever 20 is rotated from the lower position D to the upper position C, the action portion 23 descends, comes into contact with the inclined cam 33 formed on the passive portion 32 of the needle fixing body 30, and The needle 32 can be fixed between the needle support 2 and the cam pin 31 by moving the portion 32 and the cam pin 31 to the clamp position against the urging force of the spring 33.
[0029]
When the operating portion 25 of the operating lever 20 is rotated from the upper position C to the lower position D, the operating portion 23 rises and separates from the inclined cam 33 formed on the passive portion 32 of the needle fixed body 30. Therefore, the passive portion 32 and the cam pin 31 are moved to the non-clamp position by the urging force of the spring 33, and the needle 3 can be opened.
[0030]
【The invention's effect】
As described above, the needle stop device of the sewing machine according to the first aspect of the present invention can perform the operation of attaching and detaching the needle only by up and down operation of the operation lever, so that the operation is simple. Foldable, the operating lever can be formed long, the needle can be attached firmly with strong pressing force, and the operating lever is stored along the needle stopper body when the hinge is closed, which prevents sewing. Therefore, there is an effect that the needle stopper device has high safety.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a needle stopping device of a sewing machine according to the present invention. FIG. 2 is a front view of a main part when a needle fixing body clamps a needle. FIG. 3 is a side view of FIG. FIG. 5 is a front view of the main part when the needle fixing body releases the needle. FIG. 5 is a view showing that the needle fixing body is used as a thread guide. FIG. 6 is a cross-sectional view of the main part showing a second embodiment. The same side view of FIG.
DESCRIPTION OF SYMBOLS 1 Needle bar 2 Needle support part 3 Needle 4 Needle stopper body 8, 30 Needle fixed body 9 Rotating part 11, 31 Needle stopper part (cam pin)
12, 32 Passive part 20 Operating lever 22 Axle support part 23 Working part 24 Hinge 25 Operation part 27 Coil spring 25a Thread guide

Claims (4)

A needle stop device fixed to the lower end of the needle bar, wherein the upper portion of the sewing needle is inserted from the lower end of the needle stop body so as to be fixed in the needle stop body.
A clamp position that is disposed on the front side of the needle stopper body opposite to the needle holder in the needle stopper body that supports the upper rear surface of the sewing machine needle, and the tip end side presses the upper part of the needle against the needle holder; A needle fixing body that can be moved to a non-clamping position to release the needle, and a base end side that is a passive part,
The intermediate portion is a shaft supporting portion rotatably supported in an upward or downward direction with respect to the needle stopper body, one end is an action portion that can be brought into contact with and separated from the needle fixed body, and a hinge is provided on the other end. An operation lever having an operation unit that can be opened and closed via
When the hinge of the operation lever is closed, the operation portion is locked along the needle stopper body, the hinge is opened, and the operation portion is operated up and down to rotate the shaft support portion in one direction or another direction. Then, the action portion can move the needle fixed body to a clamp position or a non-clamp position. 2. The sewing machine according to claim 1, wherein when the operation lever is closed and the operation portion is locked along the needle stopper main body, the distal end portion serves as a thread guide for a needle thread passed through a needle hole. Needle stopper device. The needle fixing body has a rotating part pivotally supported by a needle stopper body so that the intermediate part can be rotated about a horizontal rotation axis, and one end of the needle fixed by the rotation of the intermediate part of the needle fixing body. A needle stopper that is movable between a clamp position for clamping the upper part of the needle between the support part and a non-clamp position for releasing the needle; 3. The needle stopping device for a sewing machine according to claim 1, further comprising: a passive portion having a movable portion, wherein the needle stopping portion of the needle fixing member clamps or releases the needle by an up and down rotation operation of the operation portion. The needle fixed body is supported by the needle stopper body so as to be slidable substantially linearly, and a sliding position of the needle fixed body clamps one end of the needle between the needle support and the upper part of the needle, A needle stopper which can be moved to a non-clamping position for releasing the needle, and a passive part whose other end is pressed by the operating part of the operating lever, and the needle is fixed by rotating the operating part up and down 3. The needle stop device of the sewing machine according to claim 1, wherein the body slides and the needle stop clamps or releases the needle.

Images