JP2001170386A - Clutch device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch device for a sewing machine constituted to perform bobbin winding work by cutting off conduction between a pulley and an arm shaft by the turning operation of a bobbin winder frame of a bobbin winder complete when performing bobbin winding work. SOLUTION: A clutch operating piece is fitted to the bobbin winder frame of the bobbin winder complete, and connection between the pulley and a clutch is detached by the turning motion of the bobbin winder frame to cut off conduction between the pulley and the arm shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device for a sewing machine, and more particularly to a clutch device for interrupting conduction between a pulley and an upper shaft of a sewing machine in accordance with the rotation of a thread winding arm during a thread winding operation.

[0002]

2. Description of the Related Art In bobbin bobbin winding operations, it has been conventionally practiced to cut off conduction between the upper shaft of a sewing machine and a pulley and to contact a friction wheel of a bobbin winding device having an empty bobbin with the pulley to perform bobbin winding. Also, 56-25
DESCRIPTION OF RELATED ART As described in Unexamined-Japanese-Patent No. 670 and Unexamined-Japanese-Patent No. 6-30152, the clutch apparatus for interrupting | transmitting the conduction between the upper shaft of the sewing machine and the pulley is conventionally known.

[0003]

However, in the above-mentioned conventional clutch device, the operation between the pulley and the upper shaft is interrupted by operating the clutch operating member. Not relevant. In the bobbin winding operation, following the operation of the clutch operating member, the bobbin arm of the bobbin winding device is rotated so that the friction wheel mounted on the bobbin arm comes into contact with the pulley. Therefore, there is a problem in the bobbin winding operation that two operations must be performed, that is, the operation of interrupting the conduction between the pulley and the upper shaft and the operation of rotating the bobbin arm.

SUMMARY OF THE INVENTION [0004] An object of the present invention is to solve the above-mentioned problems by rotating the bobbin arm of the bobbin winding device during the bobbin winding operation, thereby interrupting the conduction between the pulley and the upper shaft and performing the bobbin boring operation. It is an object of the present invention to provide a clutch device for a sewing machine as described above.

[0005]

In order to solve the above-mentioned problems, the present invention provides a clutch device in which a clutch actuating piece is attached to a thread winding arm of a thread winding device, and a pulley and a clutch are rotated by rotating the thread winding arm. Is disconnected, and the conduction between the pulley and the upper shaft is cut off.

Further, in order to efficiently and simultaneously perform the conduction interruption between the pulley and the upper shaft and the winding of the bobbin during the bobbin winding operation, a clutch operating piece is attached to the bobbin arm of the bobbin winding device. By the rotation, the connection between the pulley and the clutch is disengaged, the conduction between the pulley and the upper shaft is cut off, and the friction wheel mounted on the thread winding device is engaged with the pulley. .

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes an upper shaft supported by a machine frame a of the sewing machine, 2 denotes a pulley attached to the upper shaft, 3 denotes a clutch, 4 denotes a hand wheel, and 5 denotes a thread winding device.

As shown in FIGS. 1 and 2, the pulley 2 is composed of a boss 6 pivotally mounted on the upper shaft 1, a disk 7, and a conduction wheel 8 formed on the outer periphery of the disk 7. A thin recess 9 having a plurality of ribs is formed at a central portion of the disk 7, and a clutch engaging portion 11 having clutch claws 10 projecting at equal intervals is formed at a peripheral portion. .

A thin flange 1 is provided on the inner edge of the conduction wheel 8.
2 are provided, and teeth 13 are engraved on the outer peripheral surface,
Pulley 2 is driven by a drive motor and has a toothed belt (not shown).
The upper shaft 1 and the pulley 2 are engaged and disengaged in accordance with the operation of the clutch 3.

As shown in FIGS. 1 and 3, the clutch 3 is composed of a boss 14 and a clutch plate 15 which are slidably and loosely fitted on the upper shaft 1.
And a clutch ring 16. A split groove 17 is formed through the boss 14 and the clutch plate 15, and the split groove 1 is formed.
A pin 18 fixed to the upper shaft 1 is slidably fitted in 7, and the clutch 3 is rotated integrally with the upper shaft 1. A clutch ring 16 is provided upright on a predetermined circumference of the clutch plate 15 so as to face the clutch engaging portion 11 of the pulley 2.
9 is engraved.

As shown in FIG. 1, a sleeve 20 is fitted into the end of the upper shaft 1 and a holding member 21 of the handwheel 4 is fitted into the sleeve 20.
2 fastened to the upper shaft 1. A plurality of recesses 23 are formed at the inner peripheral end of the holding member 21.

The handwheel 4 is provided with an engagement ring 24 fitted to the holding member 21. At the inner end of the engagement ring 24, a plurality of inwardly projecting engagement claws 25 are provided. I have. The engaging claw 25 engages with the concave portion 23 of the holding member 21 when the hand wheel 4 is pushed in, thereby fastening the hand wheel 4 to the holding member 21 and rotating integrally with the upper shaft 1. Like that.

A compression spring 26 is wound around the upper shaft 1 between the sleeve 20 and the side end surface of the boss 14 of the clutch 3, and biases the clutch 3 inward in the axial direction to cause the pulley 2 to rotate. It is made to engage.

As shown in FIG. 1 and FIG.
A bobbin arm 30 rotatably supported by the machine frame a, a bobbin shaft 31 pivotally supported by the bobbin arm 30, and a clutch operating piece 32 attached to the bobbin arm 30. A bearing portion 33 of the bobbin shaft 31 is formed at an intermediate portion of the bobbin arm 30, and a cylindrical body 34 extending upward is erected on the bearing portion 33. On the side of the bearing 33, the support rod 35 of the clutch operating piece 32 is
The support rod 35 is provided with a screw 36 at a fixed position.

The bobbin shaft 31 is vertically positioned via a sleeve 37 and is supported by a bearing 33.
A friction wheel 38 is fitted to the lower end of the bobbin shaft 31, and contacts the inner surface of the pulley 2 at the time of bobbin winding to rotate the bobbin shaft 31.

The clutch operating piece 32 includes a frame portion 39, a mounting portion 40, and an L-shaped operating rod 41 bent downward from the mounting portion 40. The inner periphery of the frame 39 is the bearing 3
3 is in sliding contact with the outer periphery of the cylindrical body 34, and a slit 42 is formed in the mounting portion 40.
5 is attached as position adjustable.

At the free end of the bobbin arm 30, a spring mounting plate 4
4 are provided in series, and are urged to rotate the thread winding arm 30 counterclockwise by a spring 45 wound around a spindle attached to the machine frame a.

Next, the operation and effect of the thread winding device and the clutch device of the present invention will be described. In thread winding work,
When the bobbin is mounted on the bobbin shaft 31 and the bobbin arm 30 is rotated counterclockwise, the clutch operating piece 32 engages with the clutch plate 15 and moves it to the right as shown in FIGS. As a result, the engagement between the clutch pawl 19 of the clutch ring 16 and the clutch pawl 10 of the pulley 2 is released. for that reason,
The conduction between the pulley 2 and the upper shaft 1 is cut off, and only the pulley 2 rotates.

With the rotation of the thread winding arm 30, the friction wheel 38 is rotated in contact with the pulley 2, and the bobbin is wound with a thread from a thread supply source, thereby performing a thread winding operation. At this time, the clutch operating piece 32 is inclinedly engaged with the clutch plate 15 and is further urged by the spring 45, so that it is prevented from rotating clockwise, and the disengaged state of the clutch is maintained. Is done.

When only the upper shaft 1 is rotated while the sewing machine is stopped to raise the needle position, the thread winding arm 30 is used.
, The conduction between the pulley 2 and the upper shaft 1 is cut off, and the handwheel 4 is manually rotated to rotate only the upper shaft 1.

[0021]

The present invention has the following effects because it is configured as described above. In accordance with the rotation of the bobbin arm, the clutch is operated to interrupt the conduction between the pulley and the upper shaft, and the friction wheel mounted on the bobbin is engaged with the pulley. It can be performed only by moving operation.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a thread winding device and a clutch device of the present invention.

FIG. 2 is a right side view of the pulley.

FIG. 3 is a top view illustrating the relationship between the thread winding device and the clutch.

FIG. 4 is a cross-sectional front view showing the thread winding device and the clutch device during thread winding.

FIG. 5 is a top view for explaining a relationship between a thread winding device and a clutch at the time of thread winding.

[Explanation of symbols]

 a Machine frame 1 Upper shaft 2 Pulley 3 Clutch 4 Handwheel 5 Pinwheel 8 Conduction wheel 10, 19 Clutch pawl 11 Clutch engaging portion 15 Clutch plate 16 Clutch ring 30 Thread arm 31 Thread shaft 32 Clutch actuating piece 33 Bearing portion 35 Support Rod 38 Friction wheel 41 Operating rod

Claims (2)

[Claims] A clutch actuating piece is attached to a bobbin arm of a bobbin winding device, and the rotation of the bobbin arm disengages the coupling between the pulley and the clutch, thereby interrupting conduction between the pulley and the upper shaft. A clutch device for a sewing machine. 2. A clutch operating piece is attached to a bobbin arm of the bobbin winding device, and the rotation of the bobbin arm disengages the coupling between the pulley and the clutch, thereby cutting off the conduction between the pulley and the upper shaft and providing the bobbin with a bobbin. A clutch device for a sewing machine, wherein a mounted friction wheel is engaged with a pulley.