JPS6258756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an upper feed mechanism of a sewing machine in which a feed dog and an upper feed dog cooperate to pinch and feed a workpiece.

[Prior art]

Various types of upper feed devices for this type of sewing machine have been proposed in the past, but 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 parallel to the main shaft via an eccentric cam fixed to the main shaft (not shown), and the upper feed provided on the oscillator 6. a link 1 connected to an eccentric cam 9 fixed to a main shaft 8;
0, 11, 12, and 13, the L-shaped lifting link 14 rotates around the shaft 16 of the support body 15, and the second interlocking mechanism acts so that the upper feed dog 7 provided on the swinging body 6 moves up and down. The upper feed wheel 7 rises and moves to the right, and descends to feed the material to be sewn to the left in cooperation with a feed dog (not shown). In addition, the workpiece is taken in and out by vertically moving the upper feed dog 7 and the presser foot 17, but the horizontal and vertical movements by the first and second interlocking means are complicated, and Since the presser bar 18 is exposed to the outside and protrudes, it may cause oil scattering or oil leakage caused by lubricating connecting parts and sliding parts, etc., resulting in dirt on sewn products and troublesome maintenance. Problems such as the related structural members being large in size, such as the protruding member extending to the opposite side of the operator and the wide width obstructing the sewing work, remain unsolved.

[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, and embodiments of the present invention will be described below with reference to the drawings.

2a, b, c and 3 show the first embodiment, and 18 is a presser bar having a hollow hole, and the presser bar metal 20 is press-fitted into the frame 19 at the front end of the sewing machine arm. It is loosely fitted so that it can slide in the direction. At the upper end of the presser bar 18, there is a presser bar holder 22 held by a screw 21, which includes a horizontal arm 22a and a hanging arm 22b.
is fitted into a vertical groove 23 provided in the frame 19 and is prevented from rotating in the rotation direction. Also, presser bar 18
The support body 15 is fixed to the lower end of the support body 15 with a screw.
The presser foot 17 is attached and fixed with screws 24.
A vertical rod 25 is loosely fitted into the hollow interior of the presser rod 18 so as to be freely slidable in the axial direction. A roller 26 is provided at the lower end of this vertical rod 25 so as to engage orthogonally with the forked portion 6a of the singing body 6 that reciprocates horizontally in the cloth feeding direction. A pin 27 is provided in the opposite direction to form the first and second engaging portions. A screw 29 is screwed into the head of the upper and lower rods 25 so as to hold a coil spring 28, which has an elastic force weaker than the elastic force acting on the presser rod 18 and always acts downward, and press it downward from above. Further, the presser bar 18 is provided with a long hole 30 along the axial direction so as not to impede the vertical sliding movement of the pin 27 in the axial direction. A knob 31 that is screwed onto the head surface of the presser bar 18 and the head of the arm.
A coil spring 32, which always acts downward, is sandwiched between the knob 31 and the bottom surface of the knob 31, and a coil spring 33 and a screw 34 are provided in the hollow hole of the knob 31.

On the other hand, 35 is an eccentric cam 9 fixed to the main shaft 8.
At the other end of the rod, a transmission rod 38 extending horizontally is interposed between the rotating member 36 and a holding member 37 having a bearing portion 37a screwed and fixed to the frame 19. and transmission rod 3
The other end of 8 is passed horizontally on the right side of the holding member 37 into the shaft hole 39b of the swinging member 39 having the locking piece 39a, and is fixed with a screw. Reference numeral 40 denotes an L-shaped link, which has a claw 40a and a claw 40b, and a step screw 4 is attached to the vertically hanging arm 22b of the presser bar holder 22.
It is rotatably supported by a shaft 0c. here,
A swinging body 3 is installed inside the claw 40a of the L-shaped link 40.
The rod 35, the rotating member 36, and the holding member 3 are brought into contact with each other in such a way that the locking piece 39a of No. 9 comes into contact with the pin 27 provided on the above-mentioned upper and lower rods 25 on the inside of the claw 40b.
7. The transmission rod 38, the swinging member 39, and the L-shaped link 40 constitute a second interlocking means within the frame. On the other hand, reference numeral 6 denotes a swinging body, which is provided with a connecting part 6a of a fork in parallel to the cloth feeding direction, an upper feed tooth 7 on the right side, and a connecting part 6b on the left side, and a rotating link 41 at the connecting part 6b.
and the first moving means of the conventional upper feeding device are rotatably supported.

The other end of the rotation link 41 is rotatably supported by the horizontal arm 15a of the support body 15. Therefore, the size of the forked portion of the connecting portion 6a of the swinging body 6 is selected so that it operates reliably against the vertical movement of the vertical rod 25 and the horizontal reciprocating movement by the first moving means. Nao 4
Reference numeral 2 denotes a connecting portion interlocked with the main shaft, 43 a needle bar, 44 a needle, and 45 and 46 metal parts provided on the frame 19 of the needle bar 43.

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 8 swings and the rod 35 moves upward (indicated by the solid line arrow), the rotating member 36 rotates in the direction of the arrow, so that the transmission rod 38 also moves in the direction of the arrow. Therefore,
Since the swinging member 39 is interlocked with the transmission rod 38,
The locking piece 39a rotates in the direction of the arrow. next,
The locking piece 39a of the swinging member 39 is connected to the pawl 40a of the L-shaped link 40, which is configured to be rotatable via the step screw 40a and the arm 22b formed by the presser bar holder 22 hanging down.
is pressed and rotated in the direction of the arrow around the shaft of the stepped screw 40c. Therefore, the claw 40b pushes up the pin 27 fixed to the upper and lower rods 25 which are loosely fitted to the presser rod 18, so that the upper and lower rods 25 rise. Up and down bar 25
When the vertical bar 25 is raised, the rollers 26 fixed to the lower ends of the vertical rods 25 engage with the connecting portions 6a of the forked portions of the oscillating body 6, and in conjunction with the rotation link 41 of the support body 15, the oscillating body 6 is held down by the bar 18. moves upward against the coil spring interposed in the hollow part of.

Next, when the rod 35 moves downward (in the direction of the dotted line), the rotating member 36, the transmission rod 38, the swinging member 39
is rotated in the direction of the dotted arrow, the engagement between the locking piece 39a of the swinging member 39 and the claw 40a of the L-shaped link 40 is released, and the upper and lower rods 25 by the L-shaped ring 40 are
The engagement with the pin 27 is also released.

Therefore, the elasticity of the coil spring 28 interposed in the hollow portion of the presser bar 18 pushes down the vertical bar 25, so that the rocking body 6 returns to its original position.

By repeating the above steps, the vertical rod 25 moves up and down in conjunction with the main shaft.

To summarize the above explanation as the operation of the upper feed mechanism, in FIGS. 2a and 2b, when the upper feed shaft 1 rotates clockwise, the As the rocking body 6 is moved to the right, the rod 35 moves upward in synchronization with this movement, and the L-shaped link 40 rotates counterclockwise, pushing up the pin 27 fixed to the upper and lower rods 25. The vertical bar 25 rises.

Therefore, the rollers 26 of the upper and lower rods 25 push up the connecting portion 6a of the forked portion of the rocking body 6 against the coil spring 28, and the support body 1 supported by the upper and lower rods 25 pushes up.
5. The oscillating body 6 equipped with the upper feed dog 7 rises upward via the rotation link 41, and thus moves to the right while staying upwardly away from the object to be sewn. Further, when the upper feed shaft 1 rotates counterclockwise, the first moving means 2, 3, 4,
5 moves the rocking body 6 to the left, and in time with this, the rod 35 moves downward, and the L-shaped link 40 rotates clockwise, causing the pin 27 fixed to the upper and lower rods 25 to rotate. , the coil spring 28
Due to the elasticity of the upper and lower rods 25, the oscillator 6 descends downward via the rollers 26 of the upper and lower rods 25 and the support body 15, so the upper feed dog 7 moves to the left while being pressed against the material to be sewn by the coil spring 28. You will be able to feed the cloth by performing four movements.

4a and 4b are a front view and a perspective view of the main parts of the second embodiment, and the main difference from the first embodiment is that the lower end of the upper and lower rods 25 is arranged perpendicularly to the cloth feeding direction. A link 47 is rotatably supported by a step screw 48 on a roller 26 provided so that the link 4
The other end of 7 is connected to the connecting portion 6a of the rocking body 6.

That is, the vertical rod 25 and the swinging body 6 are connected by a link 47.

The horizontal distance of the upper feed dog 7 in the first and second embodiments changes in proportion to the swing angle of the upper feed shaft 1, and the upper feed dog 7 presses the material to be sewn. The force is applied to the screw 34 interposed in the hollow hole of the knob 31.
Push it with a screwdriver and engage it with the screw 29.
It becomes stronger by tightening and compressing the coil spring 28. Further, the work of loading and unloading the sewing material is performed by moving the presser bar 18 up and down via the presser bar holder 22 by operating an operating lever located at the head of the arm (not shown). That is, the arm 22b of the presser bar holder 22 fixed to the presser bar 18 hangs down.
The claw 40a of the L-shaped link 40 is rotatably attached to the
When the sewing machine stops, the locking piece 39 of the singing member 39
a, and also engages with the pin 27 of the upper and lower rods 25.

Therefore, when the presser foot 18 is moved up and down, the presser foot 1
7. The swinging body 6 and the upper feed dog 7 also move up and down.

Note that this invention is not limited to the configuration of the above-mentioned embodiments; for example, the configuration of each part, such as the shape of the link and the engaging part, may be changed without departing from the spirit of the invention. It is possible.

〔Effect of the invention〕

As explained above, in the present invention, the second interlocking means connected to the eccentric cam 9 fixed to the main shaft 8 is housed in the frame of the sewing machine, and the second interlocking means interlocked with the main shaft 8 moves the presser bar 18. The presser bar 1 is moved up and down by vertically moving the vertical bar 25 via a pin 27 of a second engaging part provided on the vertical bar 25 which is loosely fitted in the hollow part.
8 and the vertical rod 25, there is no risk of oil scattering or oil leakage from the vertical movement mechanism due to oil supply, which will not stain the sewn products or cause maintenance troubles. The sewing machine has the following effects: reliability is improved by being freed from the need for sewing, and the size in the cloth feeding direction is shortened from the operator's perspective, making it possible to downsize the sewing machine, making it easier to perform sewing work, and playing a major role in improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional upper feed mechanism, and FIGS. 2 a, b, and c are front views showing a first embodiment of the upper feed mechanism of the present invention and an explanatory diagram of the configuration of the second interlocking means. 3 is a partial side view of FIG. 2 a of the present invention, and FIGS. 4 a and b are a partial front view showing a second embodiment of the upper feeding mechanism of the present invention. FIG. 3 is a perspective view of main parts.

Claims (1)

[Scope of Claims] 1. A hollow presser bar 18 to which a support 15 having a presser foot 17 is attached, and a first engagement member that is slidably slidably in the axial direction of the hollow part of the presser bar 18 and is first engaged with the lower end. The upper and lower rods 25 have second engaging portions 27 at their ends inside the frame 19 and the connecting portions 6 that connect with the first engaging portions 26 at the lower ends of the upper and lower rods 25.
a, an oscillating body 6 comprising an upper feed dog 7, an elastic member 28 that always applies a downward elastic force to the upper and lower rods 25, and an oscillating body 6 that is interlocked with the main shaft and provides a reciprocating movement along the cloth feeding direction. The main shaft is provided with a first moving means for imparting motion, and a second interlocking means for interlocking with the main shaft and engaging with a second engaging portion 27 provided on the vertical bar 25 to impart vertical motion to the vertical bar 25. Interlockingly, the upper feed dog 7 is moved by the first moving means.
The sewing machine is characterized in that the upper feed dog 7 is moved up and down by reciprocating in the cloth feeding direction and sliding the upper and lower rods 25 up and down in the hollow part of the presser rod 18 by a second interlocking means. Top feed mechanism.