JPH0117261Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a feed adjustment device for a sewing machine, and in particular, the amount of cloth feed during sewing using a cloth feed control cam and the cloth feed during sewing without using the cam. This invention relates to a feed amount adjusting device that can increase or decrease both amounts.

[Prior art and its problems]

Various sewing machines have been devised that can perform both sewing using a cloth feed control cam and sewing without using the cam, and the amount of cloth feed is usually adjustable.

However, in conventional sewing machines of this type, the mechanism for adjusting the amount of cloth feed during sewing using the cloth feed control cam and the mechanism for adjusting the amount of cloth feed during sewing without using the cam are configured separately. The mechanism is becoming more complex.

Therefore, as described in Japanese Utility Model Publication No. 47-40626, a method has been devised in which the amount of cloth feed during double-sided sewing can be adjusted by operating a feed adjustment dial.

However, this one uses a part of the circular grooved cam to control the amount of cloth feed during sewing using the cloth feed control cam.
Since the fabric feed amount is adjusted in other areas when sewing without using a control cam, the degree of adjustment of the feed amount for both methods is different in relation to the amount of dial rotation, and the adjustment position of both dials is also different, making the operation complicated. It has become a thing.

With the above points in mind, it is an object of this invention to provide a cloth feed amount adjusting device that allows the cloth feed amount during both sewing operations to be changed at the same ratio by the same operation.

[Means for solving problems]

In order to achieve the above object, the cloth feed amount adjusting device of this invention includes a first lever that is interlocked with a follower that engages with a cloth feed control cam that rotates in conjunction with the upper shaft of the sewing machine and that swings. , a second lever for swinging the cloth feed adjuster is mounted on the sewing machine arm so as to be able to swing in the same direction, and the two levers are opposite to each other in the swinging direction; A transmitting body whose contact surface is a circumferential surface is movably fitted on both opposing surfaces, and means is provided for interlocking both levers by constant pressure contact via the transmitting body, and the transmitting body is connected to a second lever. means for moving the cloth feed control cam toward the swing point of the lever and keeping it immovable relative to the swing points of both levers at that moving position, and means for releasing the interlock between the cloth feed control cam and the first lever. and means for supporting the first lever in a state where the opposing surfaces are not parallel when the lever is released.

[Effect]

With this structure, when the sewing machine is driven with the cloth feed control cam and the first lever interlocked, and the cloth feed control cam rotates and the first lever swings via the follower, the first Since the lever and the second lever are always pressed together and interlocked via the transmission body, the second lever also swings to swing the cloth feed adjuster, and the amount of cloth fed is determined by the swing angle. Sewing is performed based on feed.

During this sewing process, when the transmitter is moved along the opposing surfaces, the swing points of both levers are different, so
The swing angle of the second lever increases or decreases as it moves. Therefore, the swing angle (swing width) of the point of action of the second lever increases or decreases, and the swing angle of the cloth feed adjuster also increases or decreases. This increase/decrease changes the cloth feed amount.

Furthermore, if the interlock between the cloth feed control cam and the first lever is released and the first lever is supported in a state where both opposing surfaces are not parallel, the inclination angle of the second lever with respect to the first lever can be adjusted by moving the transmission body. changes, and based on this, the inclination angle of the cloth feed regulator also changes. That is, the amount of cloth feed during sewing without using the cloth feed control cam changes.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

〔Example〕

In the figure, reference numeral 1 denotes a mounting board, which is fixed at a proper position within the sewing machine arm (not shown). Reference numeral 2 denotes a rotatable lever mounted on the right side of the upper end of this board 1 as viewed in FIG. 1 with a rotating shaft 3 as a fulcrum. The upper end of the interlocking rod 4 is connected to the front end of a cloth feed adjustment lever 6.

The lever 6 is rotatably supported by an eccentric shaft 7 attached to the sewing machine arm as shown in FIG. That is, a fine adjustment shaft 10 having a fine adjustment knob 9 is rotatably fitted into the center hole of a display plate 8 fixed to the front surface of the sewing machine arm.
An eccentric shaft 7 is formed at the inner end. Therefore, by turning the knob 9, the fulcrum of the lever 6 is slightly displaced as in the conventional case, and the cloth feed can be finely adjusted so that the forward feed amount and the backward feed amount match.

11 is a cloth feed control cam fixed to a camshaft attached to a sewing machine arm, and 12 is a follower that comes into contact with this cam 11. This follower 12 swings together with a swing frame 12' rotatably attached to the sewing machine arm, and the piece 1 fixed to the swing frame 12'
The pin 13' at the third end is brought into contact with the rear end of the lever 6.

14 is a shaft 15 with its lower end as a fulcrum.
The swing lever is attached to the left side of the lower end of the lever, and the contact portion 16 at the upper end thereof comes into contact with the lower side of the cloth feed adjuster 17. This cloth feed regulator 17 is attached to the sewing machine arm by a shaft 18, and controls the feed amount and forward/backward movement of the feed dog of the sewing machine by a known mechanism. A piece 19 is fixed to the side of the adjuster 17, and a spring 20 stretched between the piece 19 and the sewing machine arm acts to press the adjuster 17 against the contact portion 16.

Note that the state of the adjuster 17 in FIG. 1 is the switching position for forward and backward feed amount control, and from this state the forward feed amount is controlled by rotating the adjuster 17 counterclockwise. The backward feed amount is controlled by rotating clockwise against the

Reference numeral 21 denotes a dial shaft, which is rotatably mounted from a hole in the front wall of the sewing machine arm to a hole in the base plate 1. A swing frame 22 formed in a substantially U-shape is rotatably mounted to this shaft 21, and this frame A pin 24 fixed to an arm 23 at the inner end of the lever 22 can be brought into contact with the side of the lever 2.

Further, a knob 25 is provided at the tip of the portion of the dial shaft 21 that protrudes from the front wall of the sewing machine arm, and a manual lever 26 is rotatably mounted inside the knob 25. holder piece 27
When the pin 38 on the side of the manual lever 26 is brought into contact with the pin 38 and the lever 26 is turned downward, the swinging rod 22 is rotated, and the pin 24 is used to turn the lever 2 upward.

28 is a pinion gear fixed to the dial shaft 21, and this gear 28 is meshed with a rack gear 30 formed on the adjustment rod 29. An arm 31 is loosely fitted into the collar portion of the pinion gear 28, and a receiving piece 36 is provided at the attachment portion of the pinion gear 28 of the arm 31 to receive the back portion of the rack gear 30 meshed with the gear 28 to prevent the rack gear 30 from being removed. On the other hand, the arm 31 is prevented from moving around the pinion gear 28 by loosely fitting the pin 32 at the upper end of the arm 31 into a long hole 33 formed in the adjustment rod 29.

A grooved roller 34 is attached to the upper end of the adjustment rod 29, and the circumferential groove of this roller 34 is connected to the swing lever 1.
It is engaged with the guide portion 35 of No. 4.

Reference numeral 37 denotes a roller receiving part formed on the upper side edge of the lever 2, which receives the outer periphery of the roller and cooperates with the guide part 35 of the swinging lever 14 to support the roller 3.
4 in the vertical direction. Receiving part 3 of this lever 2
7 and the guide part 35, the center of the roller 34 is the lever 2.
is set so that it passes over the center of the rotation axis 3.

In addition, as shown in FIG.
The roller receiving portion 37 and the guide portion 35 are set to be parallel when the feed amount is at the zero point (forward/reverse feed amount control switching point).

In addition, the arm 23 is biased downward by a spring or the like in FIG.
4 has moved out, so there is no problem with the rocking movement. On the other hand, when the lever 26 is pressed down, the fifth
As shown in the figure, the arm 23 rotates counterclockwise via the pin 38 and the lever 2 is pushed up by the pin 24, and the lever 2 is supported at a position where the parallel state between the roller receiving part 37 and the guide part 35 is broken. be done.

This embodiment has the above configuration, and as shown in FIG.
When the centers of the levers 4 and 4 are aligned, even if the interlocking rod 4 is moved up and down by the cam 11, the lever 2 only swings around the rotating shaft 3, and the adjustment rod 29 and the swinging lever 1
4, cloth feed regulator 17, etc. do not move, so cloth feed is not performed.

In this state, hold the knob 25 and turn the shaft 21.
When the is rotated clockwise toward Fig. 1, the pinion gear 28 fixed to this shaft 2 rotates, and the rack gear 3
0, the adjusting rod 29 moves downward, lowering the roller 34 at its upper end. For this reason, roller 3
4 is located below the center of the rotating shaft 3. Therefore, when the lever 2 swings, its roller receiving part 37 pushes the roller 34, so this roller 34 swings via the guide part 35 of the swinging lever 14, and the lever 1
4 is swung, and the cloth feed adjuster 17 is swung by its contact portion 16. Since the swing angle of this adjuster 17 is proportional to the distance between the rotating shaft 3 and the center of the roller 34, the rotating angle of the knob 25 can be changed to
By changing the distance between the center of the roller 34 and the center of the roller 34, the swing angle of the adjuster 17 can be freely changed, and the forward and backward feed amount can be increased or decreased by the same width.

In this case, if the distance between the rotating shaft 3 and the roller 34 is kept constant, the cam 11 and the pattern cam (not shown) will sew a pattern including automatic forward and backward sewing with a constant feed amount, and When sewing is performed while turning the knob 25, the feed amount of pattern stitching including automatic forward and backward stitching gradually increases or decreases.

At this time, the adjustment rod 29 is connected to the rack gear 3 at the lower end.
While rotating around the dial shaft 21 while moving on the pitch circumference of the pinion gear 28 while being engaged with the pinion gear 28, the pinion gear 28
Since the arm 31 which is loosely fitted in the pinion gear 28 also rotates together with the adjustment rod 29, it does not affect the pinion gear 28. Therefore, unless the knob 25 is turned, the roller 34 is the pivot point (fulcrum point) of the levers 2 and 14.
The roller 34 remains almost stationary, and a pattern is sewn with the amount of fabric feed determined by the position of the roller 34.

Next, when the manual lever 26 is pushed down and the receiving piece 27 is pushed by the pin 38, the swinging frame 22 turns counterclockwise toward FIG. 1 and rotates the lever 2 upward.
The interlocking rod 4 rotates upward, and the cloth feed adjustment lever 6 shown in FIG. 4 disengages from the pin 13' provided on the piece 13 that is swung by the cloth feed control cam 11, and the lever 2 and the cloth feed control are disengaged. The linkage with the cam 11 is released.
Further, when the lever 2 is pushed up (rotated clockwise) by the pin 24, the parallel state between the roller receiving part 37 and the guide part 35 is broken, as shown in FIG.

Therefore, as shown by the chain line in the figure, the knob 25
When the roller 34 is moved by turning, the roller receiving part 37
Since it is immovable, the lever 14 moves according to its movement.
is swung, and the cloth feed adjuster 17 is swung through the contact portion 16, so that the amount of cloth feed can be manually adjusted during sewing without using the cloth feed control cam.

In addition, as a means of manually shifting the position of the adjustment rod that supports the roller, in addition to the rack gear and pinion method, the adjustment rod is provided with a lever that interlocks with the dial and a long hole in which a pin provided on the lever engages. A method of moving the rod may also be used.

Further, the interlocking between the cloth feed control cam 11 and the lever 2 can be released by a known mechanism similar to the conventional one, in addition to the means for disengaging the cloth feed adjustment lever 6 and the pin 13'. Alternatively, the engagement may be disengaged.

In the embodiment, the first lever in the claims for utility model registration is the lever 2, the second lever is the swinging lever 14, the opposing surfaces are the guide part 35 and the roller receiving part 37, and the transmission body is the roller. 34, the means for pressing the transmitting body corresponds to the spring 20, and the means for moving and immobilizing the transmitting body are constituted by an adjusting rod 29, a pinion gear 28, a rack gear 30, etc.
Further, the arm 23 is the first lever support means when the cloth feed control cam and the first lever are released from each other and are not parallel to each other.
It consists of etc.

Note that the term "immobility" as used in the claims includes "movement" to an extent that does not affect this feed amount adjustment effect (tolerable extent). . Further, the opposing surfaces do not necessarily need to be in an overlapping state when both levers swing.

[Effect of idea]

Since this invention is constructed as described above, by appropriately moving the transmitting body, the amount of cloth feed during sewing using the cloth feed control cam and during sewing without the use of the cloth feed control cam can be increased or decreased at the same ratio.

Therefore, according to this invention, the adjustment of the cloth feed amount during both sewing operations is the same, so that the operation is simple.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view of an embodiment of the device of this invention during sewing using the cloth feed control cam, Fig. 2 is a side view of Fig. 5, Fig. 3 is an exploded perspective view, and Fig. 4. 5 is an exploded perspective view showing the relationship with the cloth feed control cam.
The figure is a partially longitudinal front view of the embodiment during sewing without using the cloth feed control cam. 2... Lever, 3... Rotating shaft, 11... Cloth feed control cam, 14... Rocking lever, 16... Contact portion, 17... Cloth feed adjuster, 23... Arm, 28...
...Pinion gear, 30...Rack gear, 34...
roller.

Claims (1)

[Scope of utility model registration request] A first lever that is interlocked with a follower that oscillates by engaging with a fabric feed control cam that rotates in conjunction with the upper shaft of the sewing machine, and a second lever that oscillates the fabric feed adjuster are opposed to each other. The two levers are attached to the sewing machine arm so that they can each swing in the same direction with different swing points, and the two levers have surfaces that face each other in the swing direction, and the contact surfaces on these opposing surfaces transmit the transmission of the circumferential surface. The body is movably fitted, and a means is provided for interlocking the two levers by constantly pressing them together through the transmitting body, and the transmitting body is moved toward the swinging point of the second lever, and at that moving position, the swinging of both levers is provided. A means for making the moving point immobile is provided, and a means for releasing the interlock between the cloth feed control cam and the first lever is provided, and when this release is performed, the first lever is moved in a state where the opposing surfaces are not parallel. A cloth feed amount adjusting device for a sewing machine, characterized in that it is provided with a supporting means.