CZ20004332A3 - Device for adjusting rate of feed in sewing machine - Google Patents

Description

Device for adjusting the feeding size of the sewing machine

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for adjusting the amount of feed in a sewing machine for adjusting the amount of fabric fed in a sewing machine.

BACKGROUND OF THE INVENTION

An exemplary embodiment of the feed size adjusting device of the quilting sewing machine will now be schematically described with reference to the illustration of Fig. 4 (1).

The forked rod 1, the upper end of which is connected to the main shaft M of the sewing machine, has the lower end connected to the horizontal feed arm. The horizontal feed arm 2 is attached to the horizontal feed shaft to ensure rotation. The feed bar 11 provided with the feed bar 10 is connected to the horizontal feed shaft 3 via an arm 7 attached to its end. The arm 11 projects upwards.

The vertical feed shaft 6 for performing a reciprocating rotary motion is arranged parallel to the horizontal feed shaft 3, the square piece 9 being arranged on an arm 8 attached to the end of the vertical feed shaft 6. The arm 8 projects laterally.

The square piece 9 fits into the fork portion arranged on the forked rod 7. In addition, the vertical feed shaft 16 is connected to the vertical feed bar 6 for producing vertical movement in communication with the main shaft M of the sewing machine by means of the vertical feed arm 5.

The feed adjustment device 13 provided with the cam parts 13a and 13b has an upper end rotatably mounted on the sewing machine frame F by means of a screw 12. The connecting arm 16 has an upper end rotatably mounted on a forked rod 1 by means of a screw 14, its lower end it is rotatably mounted in the central part of the dose setting device 13 by means of a screw 15.

A scale dial 19 is attached to the feed quantity adjusting member 17 mounted on the sewing machine frame F, to its base end projecting outwardly from the sewing machine frame F, the other end disposed within the sewing machine frame F engages with the cam parts 13a or 13b of the dose setting device 13.

The feed lever 18 arranged on the outside of the sewing machine frame F has a support shaft connected to the lower end of the amount adjusting device 13. If the feed lever 18 is to be rotated, it is greatly inclined by the amount adjustment device 13, thereby switching the fabric feeding direction to the opposite direction.

In the fabric feeding device, the pivoting movement in the horizontal direction of the arm end T, based on the reciprocating rotational movement of the horizontal feed shaft 3, is combined with the pivoting movement

movement in the vertical direction of the arm end E3 based on the reciprocating rotational movement of the vertical feed shaft>. As a result, the feeder on the feed bar 11 then performs a feed movement having a parallelogram or elliptical shape.

If the position of the screw at the feed quantity adjusting member 17 is changed, then the end of the screw extends towards the cam portions 13a and 13b or pulls away from the cam portions 13a and 13b, the degree of inclination of the feed adjusting device 13 correspondingly changing around screw 12, such that the position of the lower end of the connecting arm 16 mounted on the amount adjusting device 13 varies.

By moving the position of the lower end of the connecting arm 16, the force component of the vertical rod 1 changes. Specifically, the rotation angle of the horizontal feed shaft 3 is determined depending on the position of the screw of the feed quantity adjusting member 17, wherein the amount of fabric fed per stitch is adjusted.

As shown in Figure 4 (2), the feed quantity adjusting member 17 is provided with an external thread which is screwed into the internal thread formed in the sewing machine frame F directly or indirectly. A plurality of notch portions 19a for positioning the control wheel The scale 19 is arranged at regular intervals in the circumferential direction on the rear face of the scale wheel 19 on its base portion.

In addition, the opening Fa is formed in the frame F of the sewing machine opposite the notch portion 19a, in which the opening Fa is • · ft

Thus, when the scale knob 19 is rotated and the adjustment pin 21 is removed from the notch portion 19a, the adjustment pin 21 is pushed down into the hole Fa against the force of the spring 20 through the rear face of the control wheel 19. with the scale, so that the scale control wheel 19 is rotated. When the adjusting pin 21 is inserted into the desired notch portion 19a, the scale dial 19 is locked in this position.

The minimum angle of rotation that can be adjusted is defined by the spacing of the notch portions 19a. However, since the scale control wheel 19 is usually made of plastic material, the pitch of the notch portions 19a cannot be reduced in order to maintain strength. Therefore, proper sewing cannot be fine-tuned.

For a finer adjustment, the scale knob 19 is made of a solid metal material to reduce the pitch of the notch portions 19a, or the diameter of the knob 19 is increased, with two adjusting pins 21 arranged to form a double notch portion. However, the adjustment cannot be performed continuously, i.e. continuously, independently of the pitch of the notch portions. As a result, the basic solution cannot be implemented.

For this purpose, notch portions are used, but the leaf spring is pressed against the screw portion of the feed quantity adjusting member. However, it is necessary to exert a relatively high force to ensure the rotation of the control wheel due to the pressure of the leaf spring. Therefore, the working ability of this solution is impaired.

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SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide a machine for adjusting the feed size of a sewing machine by means of which the amount of fabric to be fed can be adjusted continuously by means of low force, i.e. not in stages.

The above object has been accomplished in accordance with the present invention by providing a sewing machine feed size adjusting device comprising a feed quantity adjusting device having a cam portion for varying the amount of fabric fed at the feeder by varying the inclination, a feed amount adjusting comprising a engagement portion for engaging the cam portion at the end and a screw portion at the base end side, said feed amount adjusting member being non-rotatably mounted on the sewing machine frame and retractable or retractable in an axial direction; the feed rate setting rotatably mounted on the sewing machine frame, wherein the feed rate adjusting member and the feed rate adjusting shaft are bolted together with the aid of a fusing unit 99 * 9 9 φ \ φ φ φ

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9 9 Φ 9 φ · »9999 of the bolt, the feed rate adjusting member being retractable or retractable in the axial direction by rotating the feed rate adjusting shaft.

The feed adjusting member is cylindrical and has an internal thread on its inner circumference, the external thread being formed on the outer circumference of the feed adjusting shaft.

The feed dial adjusting wheel is disposed integrally with the feed dial shaft via the feed dial base attached to the sewing machine frame, the axial position of the feed dial shaft being maintained by the feed dial base.

Thus, the feed size adjusting device of the sewing machine of the present invention comprises a feed quantity adjusting device comprising cam parts in which the amount of fabric fed by the feeder is varied by varying the inclination, wherein the feed direction of the fabric by the feeder is reversed by reversing the tilt a feeder having a front end for engaging the cam parts of the feeder adjusting device mounted on the non-rotatable but extensible or retractable frame of the sewing machine, and a feeder adjusting shaft rotatably mounted on the sewing machine frame, the feed rate setting and the feed rate shaft are screwed together with a screw, and the feed rate adjusting member is retractable or • ♦ · · «9 · 9» · ·>

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9 99 9 retractable by rotating the shaft to adjust the feed rate.

The feed adjustment member is formed as a cylindrical member whose front end is closed, the internal thread being formed on its inner circumference, and the external thread formed on the outer circumference of the feed adjustment shaft.

The feed dial adjuster wheel is integrally formed with the feed dial shaft via the feed dial base attached to the sewing machine frame, the axial position of the feed dial shaft being maintained by the feed dial base.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be explained in more detail by way of examples of specific embodiments thereof, the description of which will be given with reference to the accompanying drawings, in which:

Fig. 1 is an exploded perspective view showing each component forming the amount adjusting member according to the first embodiment of the present invention;

Fig. 2 is a view showing a first embodiment of the present invention, wherein

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9 99 9 9 9 9 '99 99' 9 99 9 Fig. 2 (1) is a cross-sectional view showing the assembled condition; Fig. 2 (2) is an exploded side elevational view showing each component forming the amount adjusting member and Fig. 2 (3) is a view showing the relationship between the cylindrical portion of the sewing machine frame and the feed quantity adjusting member;

Fig. 3 is a view showing a second embodiment of the present invention, wherein Fig. 3 (1) is a sectional view showing the assembled state; Fig. 3 (2) is an exploded side elevational view showing each component forming the feed member adjusting member. Fig. 3 (3) is a plan view showing the same components, and Fig. 3 (4) is a view showing the relationship between the cylindrical portion of the sewing machine frame and the feed quantity adjusting member;

Fig. 4 (1) is a perspective view showing a portion representing a known fabric feeding device, and

Fig. 4 (2) is a cross-sectional view showing a device for adjusting the feed size.

DETAILED DESCRIPTION OF THE INVENTION

The machine for adjusting the feed size of the sewing machine according to the first embodiment of the present invention will now be described hereinafter with reference to the figures of Fig. 1 and Fig. 2.

The feed quantity adjusting device 31 has the same construction as in the known embodiment, including

the cam portion 31a or the cam portion 31b. Cylindrical member 32 for setting thread 32b. the amount administered Yippee provided internal Koncová the cylindrical member portion 32a 32 pro setting

the amount administered is provided with a hemispherical outer circumference and can be smoothly engaged with the cam portion 31a or 31b.

In addition, the flange portion 32c is disposed integrally with the rear end of the cylindrical member 32 for adjusting the feed rate. The flange portion 32c is provided with planar portions 32c ^z formed by cutting off both sides of the disc.

The sewing machine frame F is provided with an aperture Fb having an elliptical cross-section which serves to receive and hold the cylindrical member 32 for adjusting the feed amount as it is extended and retracted.

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As can be seen in Figure 2 (3), the surfaces Fb 'on both sides of the opening Fb are planar so that they can be slidably supported on the planar portions 32c' of the roller 32 for adjusting the feed rate.

Therefore, even if the feed quantity adjusting shaft 33 is rotating, or when the feed quantity adjusting member 32 is extended or retracted, the feed quantity adjusting member 32 does not rotate.

An external thread 33a to be screwed into the internal thread 32b of the feed quantity adjusting member 32 is formed on the outer circumference of the feed amount adjusting shaft 33. In addition, the flange portion 33b is integrally formed to prevent slipping

the rear end of the shaft 33 for adjusting the feed rate, taking except tapped hole of it 33c. Yippee on rear end created open Base 35 for setting of served amount,

attached to the sewing machine frame F, serves to press the flange portion 33b of the feed rate adjustment shaft 33 to prevent slipping out of the sewing machine frame F, having an aperture 35a in its center portion into which the rear end of the feed rate adjustment shaft 33 is inserted .

The upper end of the feed rate adjusting shaft 33 is inserted into the holes 35a in the feed rate adjusting base 35, further extending undulating

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4 4 4 • · <4 '4. The washer 37 and the washer 36 are integrally connected to the feed knob 34 by means of a screw 38. The washer 36 serves to protect the end face of the feed knob 34, the undulating washer 37 being arranged for reasons of insurance.

Thus, the feed rate adjusting shaft 33 and the feed rate adjusting knob 34 are integral with each other via the feed rate adjusting base 35. Therefore, the flange portion 33b of the feed rate adjustment shaft 33 is engaged with the feed rate adjustment base 35 so that the feed rate adjustment shaft 33 does not slip, and it is also very easy to mount.

The fine radial concave convex portions are formed on opposite faces of the feed rate control shaft 33 and the feed rate control knob 34. This prevents play or wobbling.

In a sewing machine size adjusting device of the sewing machine having the aforementioned construction, then when the feed rate setting knob 34 is rotated, the feed rate setting shaft 33 is also rotated. The axial rotation of the feed quantity adjusting member 32, into which the external thread 33a of the feed adjusting shaft 33 is screwed into the internal thread 32b, is controlled and controlled by the planar portion 32c ^z and the surface area Fb '.

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As a result, the feed quantity adjusting member 32 is extended or retracted in the opening Fb in the sewing machine frame F as the feed amount adjusting shaft 33 rotates.

The distance between the end portion 32a of the feed quantity adjusting member 32 and the cam portion 31a or 31b of the feed amount adjusting device 31 varies. As a result, the inclination of the feed quantity adjusting device 31 also changes so that the feed rate changes when the fabric is fed by the feeder.

In a sewing machine size adjusting device of a sewing machine having a structure according to the present invention, another member of the feed quantity adjusting member 32 is added to the known feed size adjusting device, wherein the lubricant is deposited between the member and the other members. As a result, the shock noise is significantly reduced during the operation of the automatic reverse mechanism with the aid of an electromagnetic solenoid.

In addition, the screw is not formed on the outer periphery of the cylindrical member 32 for adjusting the amount of feed, wherein almost the entire length can be accommodated in the cylindrical bore Fb in the frame F of the sewing machine. Thus, high vibration resistance can be achieved, and variations in the feeding of the fabric can be almost eliminated during operation of the sewing machine.

FIG. 3 further depicts a second embodiment of the present invention, which will now be described below

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♦ '. * '• 4 · 4 4 ¹ 4 4. 4 described. Since this device is substantially identical to the above-mentioned first embodiment, the same parts with the same functions are designated with the same reference numerals, only the differences and differences will be described hereinafter.

The feed size adjusting device of the sewing machine is different from the device according to the first embodiment of the present invention in that the feed quantity adjusting member 32 has an external thread 32d formed on its outer periphery, the feed amount adjusting shaft 33 being cylindrical and a threaded hole 33c is formed in its inner circumference.

By forming the external thread 32d, the flange portion 32c of the feed quantity adjusting member 32 is located at the center thereof, and the portions where the screws of the feed adjusting member 32 and the feed adjusting shaft 33 are to be formed are shorter than those of of the first embodiment.

The present invention is by no means limited to the above embodiments, as it can be varied in various ways.

For example, the forward cam member and the rear cam member may be provided separately instead of the forward and backward quantity changing cam portions 31 and 31b, which are integrally arranged, wherein the amount adjusting member and the amount adjusting shaft according to the first or of the second embodiment may be arranged to correspond to each cam member.

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As a result, it is also possible to independently adjust the feed rate and the feed rate.

As described above, the feed size adjusting device of the sewing machine of the present invention can adjust the feed fabric size by applying a small force, continuously, i.e. not gradually. As a result, the amount of fabric to be fed can easily be adjusted very precisely and, in addition, the sewing quality is significantly improved.

In addition, the impact noise during operation of the automatic return mechanism can be greatly reduced.

In the case where the female thread is formed on the feed rate adjusting member and the female thread is formed on the feed rate adjusting shaft, almost the entire length of the feed rate adjusting member may be housed in the sewing machine frame.

Thus, high vibration resistance can be achieved, and variations in the size of the fabric being fed are virtually eliminated during operation of the sewing machine.

Since the feed adjusting shaft and the feed adjusting control wheel are arranged integrally via the feed adjusting base, the feed adjusting shaft does not slip off the sewing machine frame, and overall assembly is simplified.

Claims (3)

PATENT CLAIMS An apparatus for adjusting the amount of feed in a sewing machine, comprising a feed amount adjusting device having a cam portion for varying the amount of feed fabric at the feeder by varying the inclination, the feed amount adjusting member comprising an engagement portion for engaging the cam portion at the end; and a screw portion on the base end side, said feed quantity adjusting member being non-rotatably mounted on the sewing machine frame, and is. retractable or retractable in an axial direction, and a feed rate adjusting shaft rotatably mounted on the sewing machine frame, characterized in that the feed rate adjusting member and the feed rate adjusting shaft are bolted by means of a screw, the feed rate adjusting member being retractable or retractable in the axial direction by rotating the shaft to adjust the feed rate. A sewing machine feed size adjusting device according to claim 1, characterized in that the feed quantity adjusting member is cylindrical and has an internal thread on its inner circumference, wherein φ 9 9 9 9 Φ Φ, Φ Φ '· 9 9 9 9' φ φ • 9 9 9 9 '99 9 9 '9' Φ Φ Φ 9 · Φ 9 '9 9 9 9 · 9 * 9 9 9 9 9 9' 9 · φ 9.9 '9999 99- 99 ·· 999.9 An external thread is formed on the outer circumference of the shaft to adjust the feed rate. The feed size adjusting device of the sewing machine according to claim 1 or 2, characterized in that the feed rate adjusting wheel is arranged integral with the feed rate adjusting shaft by a feed rate adjusting base attached to the sewing machine frame, the axial position of the feed rate adjusting shaft is maintained by the feed rate adjusting base.