JPS6258757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an upper feed mechanism of an upper feed device of a sewing machine in which a workpiece to be sewn is pinched and fed by cooperation of a feed dog and an upper feed dog.

[Prior art]

Various types of upper feed devices for this type of sewing machine have been proposed, for example,
40135, something like the one shown in FIG. 1 is presented. That is, it consists of links 2, 3, 4, and 5 connected to an upper feed shaft 1 rotatably supported in parallel with the main shaft via an eccentric cam fixed to the main shaft (not shown), and an upper feed dog provided on the oscillator 6. an L-shaped elevating link 14 consisting of a first moving means that acts to reciprocate 7 along the cloth feeding direction; and links 10, 11, 12, and 13 connected to an eccentric cam 9 fixed to a main shaft 8; The upper feed dog 7 provided on the rocking body 6 is rotated and includes a support 15 and a second interlocking means that act to move the upper feed dog 7 up and down, and the feed dog 7 rises, moves to the right, and descends to move the upper feed dog 7 up and down. The workpiece is fed to the left in cooperation with teeth (not shown), and the workpiece is taken in and out by moving the upper feed dog 7 and presser foot 16 up and down. Since the horizontal and vertical movements by the second interlocking means are performed in a complicated configuration, the presser bar 17 is connected to the support 15 and the swinging body 6 provided with the upper feed dog 7, so that the overall weight related to the presser bar is reduced. becomes large, and as a result, the fabric F1 on the upper surface of the throat plate 18 is
Not only does this cause scratches on F2, but when the feed dog and the upper feed dog 7 sandwich the fabrics F1 and F2, the tip of the feed dog jumps to the tip of the tooth of the upper feed dog 7 via the fabrics F1 and F2. This creates a problem in that the cloth is not fed reliably and a high-quality product cannot be obtained due to the impact, which accelerates the wear of the teeth and reduces the cloth feeding force. As shown in the figure, the presence of the intervening members narrows the space in the circled area, which also becomes a factor that impedes the workability of the sewing work.

[Purpose of the invention]

This invention aims to solve the above problems.

[Structure and operation of the invention]

Identical structures (equivalents) are indicated by the same reference numerals.An embodiment of the present invention will be described below with reference to the drawings.In FIG.
and the bearing 21 of the vertical shaft are fixed, and the presser rod 17 is loosely fitted into the bearing 20. An elastic coil spring 17c and its guide piece 17d are loosely inserted into the hollow interior of the presser bar 17, and a hollow sub-presser bar 17b having a sphere 17a provided at the lower part is loosely fitted. In this way, the coil spring 17c and its guide piece 17d are connected to the sub presser bar 17b.
so that it touches the top surface of the Further, the screw 17e is screwed in so as to hold the coil spring 17c and press it downward from above.The above-mentioned presser bar 17 is supported on the head of the arm so as to be movable up and down by lever operation (not shown), and A metal fitting 23 in which a cloth presser foot 16 having a hole through which a needle passes vertically is fixed to the lower end of a presser bar 17 having an elastic force in the direction of
Attach and fix in step 4. Reference numeral 6 denotes a rocking body having a receiving member 6a extending horizontally at one end so as to engage with the aforementioned sub-presser bar 17b via a sphere 17a, and an upper feed dog 7 attached to the lower end thereof in the cloth feeding direction, approximately at the center thereof. It is constructed by providing a protruding member 6d, etc., provided with a horizontal shaft hole 6b perpendicular to the cloth feeding direction at one end and a horizontal shaft hole 6c perpendicular to the cloth feeding direction at the other end.

The shaft hole 6b of the rocking body 6 has a forked rod 2 at its tip.
The other end of the support rod 25 constituted by 5a is rotatably supported by a shaft 6e, and both ends of the shaft 6e are connected to the rocking body 6 by retaining rings.
Lock on both sides.

Reference numeral 26 denotes a vertical shaft, which is loosely fitted into a bearing 21 provided on the machine frame 19 described above, and an engaging member 27 having an engaging arm 27a is attached and fixed at its tip by a screw 28.

The lower end of the vertical shaft 26 is a shaft 26a that connects to the support rod 2 described above.
The lifting ring 26c is rotatably locked together with the forked rod 25a of No. 5 by a retaining ring, and the lifting ring 26c is supported by the shaft 26d via the lifting arm 26b extending in an L shape at the lower end of the lifting ring 26c. It is configured so that it is interposed on the lower surface of the.

On the other hand, 29 is a rod loosely fitted to an eccentric cam fixed to the main shaft, and a rotating member 31 is attached to the other end of the rod 29.
is rotatably locked with step screws 30. Bearing portion 32 fixed to rotating member 31 and machine frame 19 with screws
A transmission rod 33 extending horizontally is interposed between the holding member 32 having the holding member 32 and the other end of the transmission rod 33 is attached to the locking piece 3 in the horizontal direction on the right side of the holding member 32.
4a and is fixed with a screw 34c.

Reference numeral 35 denotes a presser bar guide and holding member which is attached and fixed to the presser bar 17 described above with screws 35a, and a guide arm 35b that is perpendicular to the presser bar 17 and is slidable up and down along the longitudinal groove (not shown) of the machine frame 19. and a vertical arm 35c extending in the direction of the presser bar 17. An inverted L-shaped link 36 having claws 36a and 36b is rotatably attached to this vertical arm 35c with a step screw 37, and the claw 3
The locking piece 34a of the swinging member 34 is in contact with the inside of the locking member 6a, and the engaging arm 27 of the engaging member 27 is in contact with the inside of the claw 36b.
Make sure that a is in contact with it. On the other hand, the forked part 39a of the link 39 is loosely inserted between the protruding members 6d of the rocking body 6 so as to engage with the square piece 38, and the shaft 6g
8, and both ends of the shaft 6g are retaining rings and projecting members 6d.
Lock on both sides. Fig. 3 (A) is a front view showing the configuration of this invention, and Fig. 3 (B) is a side view thereof.
is a link having a forked portion 39a, and this link is connected to a link 42 fixed to an upper feed shaft 43 via links 40 and 41.

The present invention has the above-mentioned configuration, and the functions thereof will be explained next. When the eccentric cam fixed to the main shaft swings and the rod 29 moves upward (indicated by the solid line arrow), the rotating member 31 rotates in the direction of the arrow around the shaft of the step screw 30, so that the transmission rod 33 also rotates. Interlocks in the direction of the arrow. Therefore, since the swinging member 34 interlocks with the transmission rod 33, the locking piece 34a rotates in the direction of the arrow. Next, the locking piece 34 of the swinging member 34
a is a pawl 3 of an inverted L-shaped link 36 that is configured to be rotatable via a step screw 37 and a presser bar guide holder 35;
6a to rotate in the direction of the arrow around the axis of the stepped screw 37.

Therefore, since the claw 36b pushes up the engagement arm 27a of the engagement member 27 fixed to the tip of the vertical shaft 26, the vertical shaft 26 rises, so that the vertical arm 26b and the vertical arm 26b connected to the lower end of the vertical shaft 26 Support rod 2
5 are linked. Therefore, the lifting ring 26d contacts and presses the receiving member 6a of the oscillating body 6, and the oscillating body 6 and the upper feed dog 7 fixed to the oscillating body 6 in conjunction with the support rod 25 are moved by the coil spring of the presser bar 17. 17c and move upward. Here, the rod 29, the rotating member 31, the transmission rod 33, the swinging member 34, the inverted L-shaped link 36, the engaging member 27, etc. are referred to as second interlocking means. Next, when the rod 29 moves downward (in the direction of the dotted line), the rotating member 31, the transmission rod 33, the swinging member 3
4 is a swinging member 34 because it rotates in the direction of the dotted arrow.
The locking piece 34a is the claw 36a of the inverted L-shaped link 36.
The engagement with the engagement member 27 fixed to the upper part of the vertical shaft 26 by the inverted L-shaped link 36 is also released.

Therefore, due to the elasticity of the coil spring 17c of the presser bar 17, the receiving member 6 of the rocking body 6 is pushed through the sphere 17a.
a is pressed downward, and the lifting arm 26b of the vertical shaft 26
The oscillator 6 returns to its original position in conjunction with the support rod 25.

By repeating the above steps, the vertical shaft 26 moves up and down in conjunction with the main shaft. On the other hand, due to the swinging movement of the upper feed shaft 43, the links 42, 41, 40, 39 are moved by the swinging body 6.
Since the projecting member 6d is connected to the forked portion 39a of the link 39 via the square piece 38, the upper feed shaft 4
When 3 rotates clockwise, link 39 becomes link 4.
0 in the counterclockwise direction, and the rocking body 6 moves to the right while rotating the support rod 25 supported by its shaft 6e. Further, when the upper feed shaft 43 rotates counterclockwise, the link 39 rotates clockwise via the link 40, and the swinging body 6
It moves to the left while rotating the support rod 25 supported by e. That is, the rotation of the upper feed shaft 43 causes the first moving means of the links 42, 41, 40, and 39 to move in conjunction with each other, allowing the swinging body 6 to reciprocate in the cloth feeding direction.

Therefore, in FIG. 3A, when the upper feed shaft 43 rotates clockwise, the link 39 rotates counterclockwise via the link 40, moving the rocking body 6 to the right and When the rod 29 moves upward in time, the inverted L-shaped link 36 rotates clockwise, pushing up the engagement arm 27a of the engagement member 27 fixed to the vertical shaft 26, and the vertical shaft 26 rises. Since the lifting ring 26c of the lifting arm 26b presses the locking part 6a of the swinging body 6 against the coil spring 17c, and the support rod 25 connected to the vertical shaft 26 moves upward, it is fixed to the swinging body 6. The upper feed dog 7 is
Move to the right while staying above the sewing material, and
When the upper feed shaft 43 rotates counterclockwise, the link 39 rotates clockwise via the link 40, which moves the oscillator 6 to the left and, in time, moves the rod 29 downward. , the inverted L-shaped link 36 rotates counterclockwise and releases the engagement arm 27a of the engagement member 27 fixed to the vertical shaft 26, so that the coil spring 17c moves the oscillator through the sphere 17a. 6, the oscillator 6 descends downward together with the vertical shaft 26, and the upper feed dog 7 moves to the left while being pressed against the workpiece by the coil spring 17c. You will be able to move and feed the cloth. The horizontal distance of the upper feed dog 7 changes in proportion to the swing angle of the upper feed shaft 43, and the force with which the upper feed dog 7 presses the workpiece is applied to the coil spring by tightening the screw 17e. It becomes stronger by compressing 17c.

In addition, the work of loading and unloading the workpiece can be done by operating the operation lever located on the head of the arm (not shown).
This is done by moving 7 up and down. Presser bar 1
When the sewing machine stops, the pawl 36a of the inverted L-shaped link 36, which is rotatably attached to the presser bar guide holder 35 fixed to the presser bar guide holder 35, engages with the locking piece 34a of the swinging member 34. The presser bar 17 engages with the engagement arm 27a of the engagement member 27 fixed at the top.
When the presser foot 16 and the vertical shaft 26 are moved up and down, the upper feed dog 7 fixed to the swinging body 6 is also moved up and down.

〔Effect of the invention〕

As explained above, in the present invention, the presser foot 16 is fixed to the presser bar 17, and the vertical movement mechanism, that is, the eccentric cam linked to the main shaft, the rod 29, and the rotation member 3.
1. The vertical shaft 26 is arranged close to the presser bar 17 and connected to the oscillating body 6 through a second interlocking means consisting of the oscillating member 34, the inverted L-shaped link 36, the engaging member 27, etc. Since the horizontal reciprocating mechanism consisting of the first moving means is connected to the protruding portion 6d, resulting in a compact and integrated configuration, the oscillating body 6 and the upper feed dog 7
Since it is simplified and lightweight, even if the tip of the feed dog jumps to the tip of the upper feed dog 7 through the fabrics F1 and F2 and gives an impact, the weight of the oscillator is light and the oscillator with the upper feed dog 7 Since the vertical shaft 26 to which the movable body 6 is attached is configured separately from the presser bar 17, there is less jumping, and therefore, the fabric can be fed reliably without reducing the fabric feeding force, resulting in a high-quality product. This made it possible to speed up the sewing machine. Furthermore, since the structural members on the side opposite to the operator are compactly integrated, the space through which the cloth is fed out is widened, and the workability of the sewing work is improved.

In this embodiment, the feed dog and the upper feed dog 7 work together to pinch and feed the workpiece, but the feed dog and the presser foot 16 may also feed the workpiece in the cloth feeding direction. be.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional top feed mechanism, FIG. 2 is a perspective view showing the top feed mechanism of the present invention, and FIG.
Figures A and B are a front view and a side view showing the upper feed mechanism of the present invention.

Claims (1)

[Claims] 1. Presser foot 16 supported on machine frame 19 in a vertically movable manner
a presser bar 17 having a
A support rod 25 whose upper end is rotatably supported on the vertical shaft 26, and a central portion rotatably supported below the support rod 25 and extends above the lifting arm 26b of the vertical shaft 26. The oscillating body 6 forms a receiving member 6a that supports the upper feed dog 7, and the oscillator 6 is interlocked with the main shaft to reciprocate the upper feed dog 7 of the oscillating body 6 along the cloth feeding direction. An upper feed mechanism for a sewing machine, comprising a first interlocking means installed in the main shaft, and a second interlocking means for swinging the vertical shaft 26 so that the upper feed dog 7 moves up and down in conjunction with the main shaft.