JPS6235795B2 - - 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; and a second interlocking means that rotates around the shaft 16 of the support body 15 and acts so that the upper feed dog 7 provided on the oscillating body 6 moves up and down,
The upper feed dog 7 rises and moves to the right, and descends to feed the workpiece to the left in cooperation with a feed dog (not shown). In addition, loading and unloading of the sewing material is performed by vertically moving the upper feed dog 7 and presser foot 17.
The horizontal and vertical movements by the first and second interlocking means are complicated, and because they are exposed to the outside, there is a risk of oil scattering or oil leakage caused by lubricating connecting parts or sliding parts, etc. Otherwise, the components related to the presser bar 18 are large and have a large inertia, and jumps easily occur between them and the feed dog, which is a problem when increasing the speed of the sewing machine. Further, problems such as the protruding member extending to the opposite side of the worker or becoming wide, which obstructs the sewing work, remain unresolved.

[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 based on the drawings.

2, 3, 4 and 5 show the first embodiment.

Reference numeral 19 denotes an upper feed shaft which is swingably supported parallel to the main shaft via an eccentric cam fixed to the main shaft, and the rod 20 is fixed to the upper feed shaft 19.

The rod 20 is connected to the first rotating member 21 via a connecting portion 20a. The first rotating member 21 is rotatably supported around the connecting portion 20a. 23
is a first swinging member, in which a cylindrical main shaft 23a and a rotating shaft 23b extending in the axial direction of the main shaft 23a are integrally formed; Connected to the connecting portion 21a. The connecting portion of the first rotating member 21 and the main shaft 23a of the first swinging member 23
A collar support 22 attached to the frame 24 is interposed on the rotation shaft 23b between the first swing member 23 and the first swing member 23, which is arranged parallel to the cloth feeding direction and rotatably supported. .

The rod 20, the first rotating member 21,
The collar support 22, the first swinging member 23, etc. constitute a first moving means, which is arranged inside the frame 24.

Reference numeral 25 denotes a guide rod having a hollow hole, the lower end of which is provided on the flat portion 15a at the front end in the cloth feeding direction of the support body 15, which is provided with a presser foot 17 extending in a direction parallel to the cloth feeding direction. Long hole portion 15 along
Insert it loosely into c. A first vertical rod 26 is loosely fitted into the hollow interior of the guide rod 25 so as to be slidable in the axial direction. The lower end of the first vertical rod 26 is connected to a connecting portion 6a of a rocking body 6 that reciprocates horizontally in the cloth feeding direction.
A roller is provided in the upper part of the connecting part 6a in a direction perpendicular to the cloth feeding direction to form a first engaging part 27, and this first engaging part 27 is always in contact with the flat part 15a of the support body 15. . For this purpose, the first vertical bar 26
A coil spring 28 with an elastic force that always acts downward is interposed on the head of the guide rod 25 with an elastic body 29.
Seal the hollow part at the top of the. In addition, the first engaging portion 2
A long hole 30 is provided in the guide rod 25 along its axial direction so as not to hinder the movement of the guide rod 7. The guide rod 25 has a shaft hole 23c perpendicular to the axial direction of the first swinging member 23.
Loosely fit it in and fix it with the screw 31. On the other hand, 32 is
It is a rod loosely fitted into an eccentric cam 9 fixed to the main shaft 8, and the other end of the rod 32 is connected to a second rotating member 33.
is rotatably supported by its connecting portion 32a. 34
is a transmission rod, one end of which is connected to the second rotating member 33, and the other end of which is passed through the shaft hole 35b of the second swinging member 35 having a locking piece 35a and fixed with a screw.
The collar support 22 attached to the frame 24 is attached between the second rotating member 33 and the second swinging member 35. Reference numeral 36 denotes an L-shaped link, which has a claw 36a and a claw 36b, and forms a hanging portion of a presser bar holder 37 held by a screw at the upper end of the presser bar 18 arranged in parallel with the aforementioned guide rod 25 within the frame 24. It is rotatably supported by the arm 37a by the shaft of the stepped screw 38. The rod 32, the second rotating member 33, the collar support 22, the transmission rod 34, the second rotating member 35, the L-shaped link 36, etc. constitute a second interlocking means, and the frame 2
It is located within 4.

On the other hand, the presser bar 18 having a hollow hole is loosely fitted into a presser bar metal 39 press-fitted into the frame 24 at the front end of the sewing machine so as to be freely slidable in the axial direction. At the upper end of the presser bar 18, the aforementioned presser bar holder 3 is attached.
7, and its horizontal arm 37b is fitted into a vertical groove 40 provided in the frame 24 and is prevented from rotating in the rotation direction. In addition, the lower end of the presser bar 18 is connected to the support 15.
It is loosely inserted into the hole 15d of the stepped flat part 15b and fixed, and the presser foot 17 is attached and fixed to the support 15 with a screw 41.

A second upper and lower rod 42 is loosely fitted into the hollow interior of the presser rod 18 so as to be slidable in the axial direction. A roller 43 is provided at the lower end of the second vertical rod 42 so as to engage orthogonally with the forked portion 6b of the rocking body 6 that reciprocates horizontally in the cloth feeding direction, and the roller 43 is provided at the tip within the frame 24. A pin 44 is provided in the opposite direction to 43 to form second and third engaging portions 43 and 44. A screw 46 is screwed into the head of the second vertical bar 42 so as to hold a coil spring 45 which has an elastic force weaker than the elastic force acting on the presser bar 18 and which always acts downward, and presses it downward from above. . Further, the presser bar 18 is provided with a long hole portion 47 along the axial direction of the pin 44 of the third engaging portion described above. A coil spring 49 and a screw 50 are provided in the hollow hole of the knob 48 which is screwed into the head surface of the presser bar 18 and the head of the arm.

In addition, 51 is a driving connection part of the sewing machine linked to the main shaft, 52 is a needle bar, 53 is a needle, and 54 and 55 are needle bars 5.
This is metal provided on the frame 24 of No. 2.

The present invention has the above-mentioned configuration, and the functions thereof will be explained next. In FIGS. 3 and 4, when the upper feed shaft 19b, which is rotatably supported parallel to the main shaft via an eccentric cam fixed to the main shaft, swings and rotates clockwise, it moves in conjunction with the rod 20. The connecting portion 21 rotates in the direction of the arrow, and the first rotating member 21
rotates in the direction of the arrow, so the first swing member 23 rotates in the direction of the arrow. Therefore, the first swinging member 23
The guide rod 25 connected to the flat part 15 of the support body 15 is centered around the rotation axis 23b of the first swinging member 23.
The first vertical bar 26, which is loosely fitted into the hollow part of the guide bar 25, is always given a downward elastic force while moving to the right along the elongated hole 15c along the cloth feeding direction of a. The roller of the first engaging portion 27 of the vertical rod 26 rotates and slides on the surface of the flat portion 15a of the support body 15 and moves to the right, so that it is connected at the lower end of the first vertical rod 28. Move the rocking body 6 to the right. Next, when the upper feed shaft 19 swings and rotates counterclockwise, it moves in conjunction with the rod 20 and connects the connecting portion 20a.
rotates in the direction of the dotted arrow, and the first rotating member 21 rotates in the direction of the dotted arrow, so the first swinging member 23 rotates in the direction of the arrow.

Therefore, the guide rod 2 connected to the first swinging member 23
5 moves to the left around the rotation axis 23b of the first swinging member 23 along the elongated hole 15c along the cloth feeding direction of the flat part 15a of the support body 15, and moves in the first up and down direction as described above. Rocking body 6 connected at the lower end of rod 26
move to the left. By repeating the above steps, the first vertical bar 2
6 performs horizontal reciprocating motion in conjunction with the main shaft.

To summarize the above explanation as the action of the upper feed mechanism, when the upper feed shaft 19 swings and rotates clockwise, the guide rod 25 moves from the support 15 through the first moving means 20, 21, 22, 23. Since the flat part 15a moves rightward along the long hole 15c of the flat part 15a, the first engaging part 27 of the first vertical rod 26 that loosely fits into the hollow part of the guide rod 25 is against the surface of the flat part 15a. The first vertical rod 26 is rotated and slid to the right.
The rocking body 6 connected at the lower end thereof is moved to the right while engaging the second engaging part 43 with the connecting part 6b of the forked part, and in time with this, the second interlocking means 3
2, 33, 22, 34, 35, and 36, the L-shaped link 36 rotates counterclockwise, pushes up the third engaging portion 44 fixed to the second vertical bar 42, and pushes up the second vertical bar 42. 42 rises. Therefore, the second engaging portion 43 of the second vertical rod 42 pushes up the connecting portion 6b of the forked portion of the oscillating body 6 against the coil spring 45, so that the oscillating body 6 equipped with the upper feed dog 7 moves upwards as shown in FIG. The upper feed dog 7 rotates counterclockwise around the upper feed dog 7, and moves to the right while remaining upwardly away from the object to be sewn. Also, upper feed axis 1
9 swings and rotates counterclockwise, the rocking body 6 is moved to the left via the first linking means 20, 21, 22, 23, and in time with this, the second linking means 32, 33, 22, 34, 35, and 36, the L-shaped link 36 rotates clockwise and releases the third engaging portion 44 fixed to the second vertical rod 42, so that the coil spring 45 causes the L-shaped link 36 to rotate clockwise. The second engaging portion 43 of the two upper and lower rods 42 and the connecting portion 6 of the forked portion of the rocking body 6
Since the oscillator 6 descends downward through b, the upper feed dog 7 attached to the oscillator 6 is pressed against the material to be sewn and moves to the left, performing four movements to feed the fabric. It becomes like this. The horizontal distance of the upper feed dog 7 changes in proportion to the swing angle of the upper feed shaft 19, and the force with which the upper feed dog 7 presses the workpiece is applied to the hollow hole of the knob 48. The coil spring 45 is strengthened by engaging the intervening screw 50 with the push screw 46 using a screwdriver, tightening the screw 46, and compressing the coil spring 45. Note that the contact between the flat portion 15a of the support body 15 and the roller of the first engaging portion 27 and the elongated hole portion 15c provided in the guide rod 25 restrict the movement of the first vertical rod 26 in the vertical direction. It also has the function of guiding rod 2.
A coil spring 28,
45, the first and second upper and lower rods 2
6 and 42 can be moved smoothly without getting stuck.

Figures 6a and 6b are a front view and a side view showing the second embodiment. Reference numeral 19 denotes an upper feed shaft that is swingably supported parallel to the main shaft via an eccentric cam fixed to the main shaft, and the rod 20 is fixed to the upper feed shaft 19. The rod 20 is connected to the connecting portion 20a. The rod 20 and the connecting portion 20a constitute a first moving means. 23 is a first swinging member, which is formed into one body with a cylindrical main shaft 23a and a rotating shaft 23b extending in a direction orthogonal to the axial direction of the main shaft 23a,
A guide rod 25 made of metal is press-fitted into the cylindrical portion of the main shaft 23a, and the tip of the rotating shaft 23b is attached to the machine frame 24.
It is supported by a collar support 22. 26
is a first vertical rod (preferably thinned in the axial direction), which is loosely fitted in the guide rod 25 made of metal so that it can freely slide in the axial direction, and the upper end of the first vertical rod 26 is connected to the sixth vertical rod. As shown in FIG.
Connect to 0a. The lower end of the first vertical rod 26 is connected to a connecting portion 6a of a rocking body 6 that reciprocates horizontally in the cloth feeding direction. On the other hand, 32 is a rod loosely fitted to the eccentric cam 9 fixed to the main shaft 8, and a second rotating member 33 is rotatably supported at the other end of the rod 32 by its connecting portion 32a. The second rotating member 33 is an arm 33
a and a cylindrical rotation shaft 33b having a hollow hole extending in a direction perpendicular to the arm 33a. 35 is a second swinging member having a rod 35a, and a rotating shaft 33b of the second rotating member 33.
The rod 35a is fixed to the outer periphery of the link 5.
6 is rotatably connected. This rod 32, second rotating member 33, second swinging member 35, link 56
constitutes a second interlocking means. On the other hand, the presser bar 18 according to the prior art is loosely fitted into a presser bar metal 39 press-fitted into the front end frame 24 of the sewing machine arm so as to be freely slidable in the axial direction. The lower end of the presser bar 18 is loosely inserted into the hole 15d of the support 15 and fixed, and the presser foot 17 is attached and fixed to the support 15 with a screw 41.

Further, the support body 15 includes a forked portion 15e in the vertical and horizontal directions and a wall 15f in the vertical direction. The first vertical rod 26 described above is loosely inserted into the vertical forked portion 15e, and passes through the rollers 27 from the horizontal forked portion 15e to form the first engagement portion 27.
Therefore, the first vertical rod 26 is horizontally reciprocated via the first engaging portion and the forked portion 15e. On the wall 15f of the support body 15, a lifting link 1 of the prior art is installed.
4 is rotatably supported on the shaft of the step screw 57. The elevating link 14 is rotatably supported on the shaft of the step screw 57. An arm at one end of the elevating link 14 is connected to the second interlocking means described above, and an arm at the other end is configured to be engageable with the receiving member 6b of the rocking body 6.

The upper surface of the receiving member 6b of the rocking body 6 is connected to the presser bar 1.
It is in sliding contact with a sphere attached to the lower end of an auxiliary presser rod, which is loosely fitted in the holder 8 and is equipped with a coil having an elastic force that always presses downward (not shown).

FIGS. 7a and 7b are perspective views of the support body 15 and the first swinging member 23 described above.

Further, the relationship between the rotation shaft 23b of the first swing member 23, the second swing member 33, and the second swing member 35 will be explained.

First, the second swing member 35 is loosely inserted into the outer periphery of the rotation shaft 33b of the second rotation member 33, and then the first swing member 23 is inserted into the hollow hole of the rotation shaft 33b of the second rotation member 33.
The second swing member 35 is fixed to the swing shaft 33b of the second swing member 33 by loosely inserting the swing shaft 23b, and the collar support 22 is attached to the tip of the swing shaft 23b of the first swing member 23. is loosely fitted, and the collar support 22 is fixed to the frame 24. By doing so, the two systems of rotation shafts 23b and 33b are configured as double shafts.

Next, the operation will be explained. When the upper feed shaft 19 interlocked with the main shaft swings and rotates clockwise, the first vertical rod 26 is moved through the guide rod 25 through the first moving means 20 and 20a. Since it rotates counterclockwise around the swinging member 23, the forked portion 1 of the support body 15
5e, the upper feed dog 7 moves to the right via the connecting portion 6a of the rocking body 6 while engaging with the first engaging portion 27. In synchronization with this, when the rod 32 moves downward due to rotation of the eccentric cam 9 fixed to the main shaft 8, the second rotation member 33 rotates clockwise.
Therefore, since the second swinging member 35 also rotates clockwise, the rod 35a also rotates clockwise.

As described above, the second interlocking means 32, 33, 35,
Since the elevating link 14 is pulled to the left via the screw 56, the elevating link 14 rotates counterclockwise about the axis of the stepped screw 57.

Therefore, since the arm of the elevating link 14 pushes up the lower surface of the receiving member 6b provided on the oscillating body 6 against the elasticity of the coil spring (not shown), the oscillating body 6 is moved around the connecting portion 6a of the oscillating body 6. rotates counterclockwise, and the upper feed dog 7 moves to the right while remaining upwardly away from the workpiece. Further, when the upper feed shaft 19 swings and rotates counterclockwise, the first moving means 20, 20
a, the first vertical rod 26 rotates clockwise around the first swinging member 23 via the guide rod 25, so that it engages with the first engaging portion 27 at the forked portion 15e of the support body 15. Connecting portion 6a of rocking body 6 while
The upper feed dog 7 moves to the left via. In synchronization with this, when the rod 32 moves upward due to rotation of the eccentric cam 9 fixed to the main shaft 8, the second rotation member 33 rotates counterclockwise. Therefore, since the second swinging member 35 also rotates counterclockwise, the rod 35a also rotates counterclockwise. As described above, since the elevating link 14 is pushed to the right via the second interlocking means 32, 33, 35, and 36, the elevating link 14 is
It rotates clockwise around the shaft of the stepped screw 57. Therefore, since the arm of the elevating link 14 descends while receiving the elasticity of a coil spring (not shown) from the lower surface of the receiving member 6P provided on the oscillating body 6, the oscillating body 6 is rotated clockwise, and the upper feed dog 7 is pressed against the object to be sewn, moves to the left, and performs four movements to feed the cloth.

The main differences between the second embodiment and the first embodiment are that the two rotation shafts 23b and 33b are double shafts, and that the first vertical rod 26 is given a swinging motion. The horizontal reciprocating movement is performed around the axis of the swinging member 23, and the first vertical bar 26 does not have the elastic action of a coil spring, making the sewing machine one step further in miniaturization. .

The horizontal distance of the upper feed dog 7 and the pressing force against the object to be sewn are the same as in the first embodiment. Furthermore, in the first and second embodiments, the work of taking in and out the workpiece is carried out by moving the presser bar 18 up and down via the presser bar holder 42 by operating an operating lever located at the head of the arm (not shown). When the presser foot 18 is moved up and down, the presser foot 17, the swinging body 6, and the upper feed dog 7 are also moved 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, the first vertical rod 26 is vertically slidably supported with respect to the first swinging member 23 rotatably supported within the frame, and the first vertical rod 26 is engaged with the first vertical rod 26. The part 27 is brought into contact with a flat surface provided on the support body 15, and the first swinging member is moved relative to the first vertical bar 26 connected to the swinging body 6 by a first moving means interlocked with a main shaft provided in the frame. Since the structure is configured to give horizontal movement to the rocking body 6 by giving it rocking around the base of the sewing machine 23, the risk of oil scattering and oil leakage due to oil supply is reduced, contributing to improved reliability of the sewing machine. At the same time, the size of the cloth exposed to the outside in the feeding direction and the size of the cloth in the width direction are shortened, making it possible to downsize the fabric, making sewing work easier and playing a major role in improving productivity. Since the inertia related to the upper feed dog 7 has been reduced, the jumping between the upper feed dog 7 and the feed dog has been improved, and the sewing machine can be run at higher speeds without reducing fabric feeding force or causing fabric scratches. It has effects such as summer.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional top feed mechanism, FIG. 2 is a front view showing a top feed mechanism according to a first embodiment of the present invention, and FIGS. FIG. 4 is a side view showing the relationship between the first interlocking means, etc. of the example, a side view showing the relationship between the second interlocking means, etc., and FIG. FIG. 5 is a front view showing the main parts of the first embodiment of the present invention, and FIGS. 6 a, b and c are
7A and 7B are front and side views showing the upper feed mechanism of the second embodiment of the present invention, and perspective views showing the connection structure between the first vertical rod 26 and the rod 20.
It is a perspective view showing the main part of the second example of the present invention.

Claims (1)

[Claims] 1. A presser foot 18 that supports a presser foot 17 and a support 15 having a flat surface extending in the cloth feeding direction.
, the first swinging member 23 whose base part is rotatably supported with respect to the frame 24, the upper feed dog 7 and the engaging part 6b
and a first swinging member 2 formed above.
3, the first vertical rod 26 is vertically slidably supported, the lower end is rotatably connected to the rocking body 6, and the first vertical rod 26 supports a first engaging portion 27 that engages with the flat surface of the support body 15.
a first moving means that rotates the first vertical rod 26 about the base of the first swinging member 23 in conjunction with the main shaft; and a second interlocking means for vertically moving the rocking body 6, the first interlocking means interlocked with the main shaft reciprocates the upper feed dog 7 in the cloth feeding direction, and the second interlocking means moves the upper feed dog 7 up and down. An upper feed mechanism of a sewing machine, characterized in that it is configured to.