JP2604714Y2 - Sewing machine needle stop device - Google Patents

Description

[Detailed description of the invention]

[0001]

In this invention, the needle stopper can be tilted to facilitate attachment of the needle to the needle stopper at the lower end of the needle bar, replacement of the needle, or easy threading of the attached needle. The present invention relates to a needle stop device for a sewing machine.

[0002]

2. Description of the Related Art A conventional needle stopper is fixed at a fixed angle along the axis of a needle bar together with a needle attached to the needle stopper (for example, Japanese Patent Application Laid-Open No. 1-166796).

[0003]

As described above, the needle stopper fixed on the same axis as the needle bar is used when attaching the needle, replacing the needle, or performing threading on the needle. Since the working position is extremely low near the bed of the sewing machine, there is a disadvantage that these operations are difficult to perform. Resolving such difficulties has been a problem to be solved in a sewing machine.

[0004]

Therefore, according to the present invention, a fulcrum shaft having an axis perpendicular to the vertical direction of the needle bar is provided at the lower end of the needle bar, and the needle stopper main body is provided via the fulcrum shaft. The needle stop body is attached to the needle stop body so as to be swingable, and the needle stop body is fixed on the same axis as the needle bar.
It is an object of the present invention to provide a needle stop device for a sewing machine provided with a switching means capable of fixing the needle stop body to an avoiding position in which the needle stop body is inclined so that the needle tip of the needle is on the front side of the sewing machine.

[0005]

The needle stop device according to the present invention having the above-described structure is provided with a needle.
A fulcrum shaft with an axis perpendicular to the vertical direction of the rod
The needle stopper body attached to the lower end of the needle bar through
With the fulcrum axis as a fulcrum, it is possible to swing at an elevation angle. Accordingly
To attach or replace the needle, or
When performing threading, move the needle stopper body from the operating position to the elevation angle.
Raise the needle to the avoidance position and the needle tip
Ascends and is fixed at a high position away from the bed.
The height of the work is improved , the workability is improved, and the sewing machine is easy to use. As described above, the present invention has solved the above-mentioned problem.

In the present invention, a bracket portion is provided on the upper portion of the needle stopper main body, and a connecting body is fitted into the bracket portion, and the fulcrum shaft is inserted into a shaft hole provided in common with the bracket portion and the connecting body. The one that is inserted and fixed to the needle bar at the joint extending from the upper part of the connecting body,
With a simple structure, the needle stopper body can be swingably attached.

In the present invention, the switching means is provided on the connecting member so that the shaft hole and the axis are parallel to each other. And a large-diameter portion having the same diameter as the large-diameter opening formed at one end of the arc groove serving as the operation position, penetrates the inside of the arc groove, and has a front and rear bracket of the needle stopper body. A switching operation rod inserted into a slide guide hole provided in the section, an operation push button provided at one end of the switching operation rod, and a needle stopper attached to the main body, which constantly presses the other end of the switching operation rod. The push spring that engages with the connecting member and maintains the inclined state of the needle stopper body in the avoidance position can be securely fixed between the operating position and the avoidance position of the needle stopper body, and can be simplified. What Safety of switching under the concrete can be ensured.

In the present invention, an operation push button of the switching operation rod is provided at a position close to an inner side surface of a swing arm that rotatably supports an eye guard with respect to an arm head of the sewing machine, and operates the sewing machine. When the switching operation rod is deflected at the time by the inner surface of the swing arm, the safety of the switching means can be further improved.

In the present invention, a cam fixed to a supporting shaft that rotates integrally with the swing arm of the eye guard, an interlocking lever that swings following the cam, and operation of the interlocking lever are provided. A safety device consisting of a switch lever that turns on and off the motor switch of the sewing machine in conjunction with the sewing machine is provided with the opening and closing operation of the eye guard that is performed before the needle stop body tilts Since the startup is linked, the safety of the sewing machine operation is further improved.

In the present invention, the switch lever includes:
An end different from the end in contact with the interlocking lever faces the vicinity of the presser lifting pin, engages with an interlocking cam fixed to the presser raising pin, and moves the presser bar up and down together with the motor switch of the sewing machine. When the work lever is also used as a switch lever that turns on and off, the sewing machine motor switch automatically turns on and off in conjunction with the lifting and lowering of the presser bar. Can be further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, this needle stopper device includes a needle stopper body 3 that is swingably attached to a lower end of a needle bar 1 via a fulcrum shaft 2, and a needle stopper body 3 and a lower end of the needle bar 1. And a connecting member 4 for connecting the needle stopper body 3 to the needle bar 2 with the connecting member 4 interposed therebetween. The needle stopper body 3 has a connector 4 fitted in a bracket portion 5 erected on the left and right of the upper portion, and a shaft provided perpendicular to the axis of the needle bar 1 and provided commonly to the bracket portion 5 and the connector 4. The fulcrum shaft 2 is passed through the hole 6, and a set screw 8 is screwed into a screw hole 7 provided in the connecting body 4 to fix the fulcrum shaft 2.

The connecting member 4 is fitted with a joint portion 9 extending upward from the lower end of the needle bar 1 and caulking a stopper pin 11 into a pin hole 10 provided in common with the joint portion 9 and the needle bar 1. Then, the needle stopper body 3 is swingably connected to the lower end of the needle bar 1. The needle stopper body 3 swingably attached to the needle bar 1 has an operating position a along the same direction as the axis of the needle bar 1 and a needle tip 12 ′ of the needle 12.
Is fixed to an avoiding position b inclining so that the position is closer to the front side of the sewing machine.

In this embodiment, a switching means A for switching the needle stopper body 3 between the operating position a and the avoiding position b is provided so as to extend through the connecting member 4 in parallel with the shaft hole 6 so as to be parallel to the axis. One end of the circular groove 13 which guides the swing of the needle stopper body 3 with one end being the operating position a and the other end being the avoidance position b, and a large-diameter opening formed at one end of the circular groove 13 which is the operating position a. A switching operation rod 17 having a large-diameter portion 15 having the same diameter as the portion 14 at one end thereof, penetrating through the arc groove 13, and passing through a slide guide hole 16 provided in the bracket portion 5 of the needle stopper body 3 at the front and rear; The operation push button 18 provided at one end of the switching operation rod 17 is attached to the needle stopper main body 3 to constantly press the other end of the switching operation rod 17 and engage with the connecting body 4 to avoid the avoidance position b. The inclination state of the needle stopper body 3 at It is constituted by a compression spring 19 for lifting.

As shown in FIG. 2, when the needle 12 and the needle stopper body 3 are at the operating position a along the same axial direction as the needle bar 1, the switching operation rod 1 at the operating position a of the arc groove 13 is provided.
The large-diameter portion 15 of FIG. 7 is pressed and fitted to the large-diameter opening portion 14 of the arc-shaped groove 13 by the urging of the pressing spring 19 that presses from the outside, and as shown in FIG. The retreat in the left-hand direction in the figure is prevented. By the fitting of the large-diameter portion 15 and the large-diameter opening portion 14, the switching operation rod 17 is prevented from moving along the arc direction of the arc groove 13 and the operating position a
The needle 12 and the needle stopper main body 3 are firmly fixed, and a state in which sewing of the sewing machine is not hindered is maintained.

When the needle 12 is replaced or the thread is threaded to the needle point 12 ', the switching operation rod 1 at the operating position a is set.
When the operating push button 18 at one end of the switch 7 is pushed in against the pressing spring 19, the switching operation rod 17 is retracted and the large-diameter portion 15 and the large-diameter opening 14 are fitted together, as shown in FIG. As a result, the switching operation rod 17 can rotate in the arc groove 13. As shown in FIG. 3, when the needle 12 and the needle stopper body 3 are inclined with respect to the axis of the needle bar 1, the switching operation rod 17 rotated in the arc groove 13 is moved to the avoidance position b.
And the needle stopper body 3 with the needle tip 12 'raised is fixed at the avoidance position b. In this avoidance position b, the pressing spring 19
3 engages with the lower rear portion of the connector 4 as shown in FIG.

The switching means A attached to the needle stop device of the present invention is not limited to the illustrated embodiment, but may be any structure that makes the swingable needle stop body 3 strong at the operating position a and the avoiding position b. The design may be changed as appropriate. 2 and 3, reference numeral 20 denotes an arm head of the sewing machine.

In this embodiment, the operating push button 18 of the switching operating rod 17 at the operating position a is close to the outside thereof and is provided with a swing arm 21 supporting an eye guard 22.
The opening operation of the swing arm 21 with the support shaft 23 as a fulcrum is prevented by positioning the inner side surface 21 ′ of the eye guard 22.
, The needle stop body 3 cannot be evaded.

The support shaft 23 of the swing arm 21 is
And the cam 2 which rotates integrally with the support shaft 23 as shown in FIG.
4 and is connected to a safety device S including an interlocking lever 25 that swings following the cam 24 and a switch lever 27 that turns on and off a motor switch 26 of the sewing machine in conjunction with the operation of the interlocking lever 25. . This safety device S
Relates the operation of the sewing machine to the operation of opening the eye guard 22 when switching the needle stopper body 3 to the avoidance position b,
The motor switch 26 is automatically turned off. Also, the motor switch 26 is used to return the eye guard to the use position.
Is linked.

Further, the switch lever 27 has a T-shape, and has an end 27 'in contact with the interlocking lever 25.
As shown in FIG. 5, another end 27 ″ faces the vicinity of a press-up pin 28 of the sewing machine, and engages with an interlocking cam 29 fixed to the press-up pin 28 to form a presser bar. The switch also serves as a switch lever for turning on and off the motor switch 26 of the sewing machine together with the raising and lowering of the sewing machine 30. Therefore, the sewing machine provided with this device automatically turns on and off the motor switch 26 of the sewing machine even by raising and lowering the presser bar 30. Turn off.

This needle stopper device configured as described above
As described above, the attachment or replacement of the needle 12 or the needle tip 1
At the time of threading to 2 ', the needle stopper body 3 is placed in the avoidance position b in which the needle stopper body 3 is inclined, whereby the needle tip 12' can be displaced to a higher position on the front side of the sewing machine. Easy to work with thread and sushi.

[0021]

[Effect of the invention] As described above, the needle bar is raised at the lower end of the needle bar.
Set a fulcrum shaft with an axis that is orthogonal to the descending direction.
The needle stop body is swingably mounted via the fulcrum shaft, the operating position for fixing the needle stop body on the same axis as the needle bar, and the needle point of the needle mounted on the needle stop body are provided on the sewing machine. According to the present invention, the switching device is provided so that it can be fixed to the avoidance position where the needle stopper body is inclined so that the needle stopper body is located on the front side of the needle stopper body.
Elevating from the operating position and fixing to the avoiding position
Therefore, operations such as attachment and detachment of needles, replacement, and threading can be easily performed, and the workability of the sewing operation can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing an operation state of the embodiment.

FIG. 3 is a partially cutaway side view showing an avoidance state of the embodiment.

4 (a) shows the position of the switching operation rod in the operating state, and FIG. 4 (b) is a partially cutaway front view showing a state where the rod is pushed at the same position.

FIG. 5 is a partially cutaway side view showing a use state of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Needle bar 2 Support shaft 3 Needle stopper main body 4 Connecting body 5 Bracket part 6 Shaft hole 7 Screw hole 8 Set screw 9 Joint part 10 Pin hole 11 Pin 12 Needle 12 'Needle point 13 Arc groove 14 Large diameter part 15 Large diameter part Reference Signs List 16 Slide guide hole 17 Switching operation rod 18 Operation push button 19 Push spring 20 Arm head 21 Swing arm 21 'Inner side surface 22 Eye guard 23 Support shaft 24 Cam 25 Interlocking lever 26 Motor switch 27 Switch lever 27' End 27 "end Part 28 presser pin 29 interlocking cam 30 presser bar A switching means a operating position b avoiding position S safety device

Claims (6)

(57) [Scope of request for utility model registration] 1. At the lower end of the needle bar 1, with respect to the vertical direction of the needle bar.
A fulcrum shaft 2 having an axis perpendicular to the side is provided.
A needle stop body 3 is swingably mounted via a shaft 2, and an operation position a for fixing the needle stop body 3 on the same axis as the needle bar 1 , and a needle point of a needle 12 mounted on the needle stop body. 1
A needle stop device for a sewing machine provided with switching means A which can be fixed to an avoiding position b in which the needle stop main body 3 is inclined such that 2 ' is on the front side of the sewing machine. 2. The needle stopper body 3 is provided with a bracket portion 5 at an upper portion, and a coupling body 4 is fitted into the bracket portion 5;
A shaft hole 6 provided commonly to the bracket portion 5 and the connecting body 4
The fulcrum shaft 2 is inserted through the connecting member 4 and the joint portion 9 extending above the connecting body 4 is fixed to the needle bar 1 so as to be swingably attached to the needle bar. The needle stopping device for a sewing machine according to claim 1, wherein 3. The switching means A is provided on the connecting member 4 so that an axis thereof is parallel to the shaft hole 6, and one end is the operating position a and the other end is the avoidance position b. And a large-diameter portion 15 having the same diameter as a large-diameter opening portion 14 formed at one end of the arc groove 13 serving as the operating position a, and penetrating through the inside of the arc groove 13. And
A switching operation rod 17 which is inserted into a slide guide hole 16 provided in the bracket portion 5 of the needle stopper body 3 at the front and back.
And an operation push button 18 provided at one end of the switching operation rod 17 and attached to the needle stopper body 3 to constantly press the other end of the switching operation rod 17 and engage with the connecting body 4. 3. The needle stopping device for a sewing machine according to claim 2 , further comprising a pressing spring 19 for holding the inclined state of the needle stopping body 3 at the open position b. 4. The operation push button 18 of the switching operation rod 17 has a pivot arm 21 which pivotally supports an eye guard 22 with respect to an arm head of the sewing machine at an operation position a of the needle stopper main body 3. provided in a position close to the inner surface 21 ', claims, characterized in that it is deter acting blindly in said switching operating rod 17 during operation of the sewing machine
Item 7. A needle stop device for a sewing machine according to Item 3 . 5. The swing arm 21 includes a swing arm 2.
A cam 24 fixed to a support shaft 23 that rotates integrally with the camshaft 1, an interlocking lever 25 that swings following the cam 24, and turns on and off a motor switch 26 of the sewing machine in conjunction with the operation of the interlocking lever 25. The needle stop device for a sewing machine according to claim 4, wherein the device is connected to a safety device (S) comprising a switch lever (27 ) . 6. The switch lever 27 has an end 27 ″ different from an end 27 ′ in contact with the interlocking lever 25 near the presser pin 28, and is fixed to the presser pin 28. engages the cam 29, claims characterized in that it also serves as a switch lever for turning on and off the motor switch 26 of the sewing machine together with the lifting operation of the presser bar 30
Item 6. The needle stopping device for a sewing machine according to Item 5 .