JP2000051557A - Cloth feeding device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen a solenoid, to reduce heat generation, to reduce temperature elevation and power consumption, to reduce cost and noise and to provide a device with an excellent design property. SOLUTION: This device is constituted of a swing body 3 for performing fixed reciprocating motion by the crank mechanism of a rotary shaft, a connection link 7 for connecting the swing body and a horizontal feed shaft 4, a feed adjustment body 1 capable of adjusting the swing amount and swing direction of the horizontal feed shaft by supporting the swing body and changing the swing position of the swing body, a feed adjuster freely turnably supported by an arm where two symmetrical cam surfaces 14 are formed, an adjustment knob 15 screwed to the arm whose tip faces the cam surface of the feed adjustment body, a feed conversion link 16 for connecting the feed adjustment body and the feed adjuster, an elastic body for bringing the tip of the adjustment knob into press contact with one of the cam surfaces of the feed adjuster and the solenoid 24 supported inside the arm for connecting a suspended plunger 25 to the feed adjustment body and turning the adjustment body against the elastic body by the excitation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth feeding device for a sewing machine, and more particularly to a device for reversing the cloth feeding direction of a cloth feeding device.

[0002]

2. Description of the Related Art A conventional technique of this kind will be described with reference to FIGS. First, a first conventional technique will be described with reference to FIG. Reference numeral 1 denotes a feed adjusting body, and a shaft 2 at a central portion thereof is rotatably supported on a bed of a sewing machine (not shown). Reference numeral 3 denotes a swing link as a swing body, the base of which is rotatably supported by the feed adjusting body. Reference numeral 4 denotes a horizontal feed shaft, which is rotatably supported by a bed of a sewing machine (not shown), a horizontal feed arm 5 is fixed to the rear, and a horizontal feed arm 6 is fixed to the front.

[0003] Reference numeral 7 denotes a connecting link whose left end is rotatably connected to the horizontal feed arm 5. Reference numeral 8 denotes a horizontal feed rod. The upper end is loosely fitted to an eccentric cam 10 provided on an upper shaft 9 of the sewing machine, and the lower end is connected to one end of the swing link 3 and the right end of the connection link 7 by a shaft 11. . Reference numeral 12 denotes a feed adjuster.
And two cam surfaces 14 formed at one end.

Reference numeral 15 denotes an adjusting knob having a threaded portion screwed into an arm of the sewing machine. The tip of the adjusting knob 15 is opposed to the cam surface 14 of the feed adjuster 12. A feed conversion link 16 has an upper end connected to one end of the feed adjuster 12, a lower end connected to the feed adjuster 1, and an engagement portion 17 formed at the center.

A conversion shaft 18 is rotatably supported by the arm of the sewing machine. A conversion arm 19 is fixed to the left end, and a base of the conversion lever 20 is fixed to the right end. Reference numeral 21 denotes a pin supported by the conversion arm 19, and an engagement portion 1 of the conversion arm 19
7 below. Reference numeral 22 denotes a feed adjusting spring, which extends between a hook pin 23 provided on the feed adjusting body 1 and a bed of a sewing machine (not shown).

Reference numeral 24 denotes a solenoid having a plunger 25 in a horizontal direction, which is fixed to a bed of the sewing machine. 26
Is an L-shaped rotating link, the base of which is rotatably supported on the bed of the sewing machine by a step screw 27. One end of the rotation link 26 is connected to the feed adjusting body 1 by a link 28.
The other end is connected to the plunger 25 of the solenoid 24 by a link 29.

Reference numeral 30 denotes a vertical feed shaft, which reciprocates and swings in conjunction with the rotation of the upper shaft 9, and has a bifurcated portion 31 at the left end.
2 is fixed. Reference numeral 33 denotes a feeder, which has a feed dog 3 in the center.
4 and the left end is connected to the upper end of the horizontal feed arm 6, and the right end roller 35 is a forked portion 31 of the upper and lower feed arms 32.
Is loosely fitted.

The first conventional technique has the above-described configuration, and the operation thereof will be described below. 4 is a state in which the solenoid 24 is not excited. In this state, the feed adjusting body 1 is actuated by the action of the feed adjusting spring 22.
Are acting clockwise about the axis 2. This action force first pulls down the feed conversion link 16, rotates the feed adjuster 12 counterclockwise about the shaft 13, and the lower cam surface 14 contacts the tip of the feed adjustment knob 15,
The feed adjusting body 1 is locked at a fixed position. Further, as described above, when the feed conversion link 16 is pulled down, the engagement portion 17 pushes down the pin 21 downward, and the conversion shaft 1
8 is rotated counterclockwise, whereby the conversion lever 20 is pushed upward. Further, the feed adjusting spring 2
2 by the link 28, the pivot link 26,
Plunger-2 of solenoid 24 via link 29
5 is maintained in the right position.

When the sewing machine is driven from this state and the upper shaft 9 is rotated, first, the horizontal feed rod 8 reciprocates up and down by the eccentric cam 10, whereby the swing link 3 as the swing body is moved by the feed adjusting body 1 Reciprocates around the lower part supported by Due to the swing of the swing link 3, the shaft 11 swings along an arc having a horizontal moving component, so that the horizontal feed shaft 4 is reciprocated through the connecting link 7. The reciprocating swing of the horizontal feed shaft 4 causes the feed dog 34 to reciprocate in the horizontal direction via the horizontal feed base arm 6 and the feed base 33. When the upper shaft 9 rotates, the vertical feed shaft 30 interlocked with the upper shaft 9 also reciprocates, and the feed dog 34 reciprocates in the vertical direction via the vertical feed arm 32 and the feed base 33.

[0010] The reciprocating movement of the feed dog 34 in the horizontal direction,
By the combined movement with the vertical reciprocation of the feed dog 34, the feed dog 34 makes four movements of cloth feed in the forward direction to feed the cloth in the forward direction. During the cloth feeding in the forward direction, the solenoid 24 is excited by automatic or manual operation, and the plunger 25 is pulled to the left against the feed adjusting spring 22. As a result, the feed adjusting body 1 is rotated counterclockwise about the shaft 2 via the link 29, the rotating link 26, and the link 28. By this rotation, first, the feed conversion link 16 is pushed upward, and the feed adjuster 12 is turned clockwise about the shaft 13 to bring the upper cam surface 14 into contact with the tip of the feed adjustment knob 15. The feed adjusting body 1 is locked at the position 9. By the rotation of the feed adjuster 12, the position of the swing link 3 supported by the feed adjusting body 1 changes, and the phase of the swing of the swing link 3 by the eccentric cam 10 changes the cloth feeding in the forward direction. It is the opposite of the phase.

When the sewing machine is driven from this state and the upper shaft 9 rotates, the feed dog 3 is moved in the same manner as the cloth feed in the forward direction.
4 performs four movements of cloth feed, but the phase of swing of the swing link 3 is opposite to the phase of cloth feed in the forward direction,
By the combined movement of the reciprocating motion of the feed dog 34 in the horizontal direction and the reciprocating motion of the feed dog 34 in the vertical direction, the feed dog 34 performs four movements of cloth feeding in the opposite direction to feed the cloth in the opposite direction. .

When the solenoid 24 is demagnetized, the feed adjusting body 1 rotates clockwise about the shaft 2 by the elastic force of the feed adjusting spring 22 so that the respective parts return to the original cloth feeding phase in the forward direction. Return. Next, a second conventional technique will be described with reference to FIGS. Note that components having the same configuration and operation as those of the first conventional technology will be described using the same component names and numbers as those of the first conventional technology.

Reference numeral 1 denotes a cylindrical feed adjuster, which is rotatably supported on a bed 40 of the sewing machine. Reference numeral 3a denotes a swing piece as a swing body, which is slidably supported in the groove 36 of the feed adjusting body 1. Reference numeral 4 denotes a horizontal feed shaft, which is rotatably supported by a bed 40 of the sewing machine, and has a horizontal feed arm 5
Is fixed, and the horizontal feed base arm 6 is fixed forward.

Reference numeral 7 denotes a connection link whose upper end is rotatably connected to the horizontal feed arm 5. Reference numeral 8 denotes a horizontal feed rod. The left end is loosely fitted to an eccentric cam 37 provided on the vertical feed shaft 30 which rotates in conjunction with the upper shaft of the sewing machine, and the right end is connected to the swinging piece 3 a and the lower end of the connection link 7. Have been. 12
Is a feed adjuster, the center of which is rotatably supported by the arm 41 of the sewing machine by the conversion shaft 18, and has two cam surfaces 1 at one end.
4 are formed.

Numeral 15 denotes an adjusting knob having a threaded portion screwed into the arm 41 of the sewing machine. The tip of the adjusting knob 15 is opposed to the cam surface 14 of the feed adjuster 12. A feed conversion link 16 has an upper end connected to the feed adjuster 12 at one end, and a lower end connected to the feed adjuster 1. A base portion of the conversion lever 20 and an interlocking plate 39 having a bent portion 38 extending below the conversion lever 20 are fixed to the right end of the conversion shaft 18.

Reference numeral 22 denotes a feed adjusting spring, which extends between a hook pin 23 provided on the feed adjusting body 1 and a bed 40 of the sewing machine. Numeral 24 denotes a solenoid having a plunger 25 in the vertical direction, which is fixed to the outside of the back of the arm 41 as shown in FIG. Reference numeral 26 denotes an L-shaped rotating link whose base is rotatably supported by an arm 41 of the sewing machine by a shaft 42. One end of the rotating link 26 is connected to an interlocking plate 39 by a link 43, and the other end is connected to a plunger 25 of the solenoid 24.

Reference numeral 30 denotes an up-down feed shaft which rotates in conjunction with the rotation of the upper shaft 9 as described above. The eccentric cam 44 is fixed to the left end, and a square piece 45 is loosely fitted around the eccentric cam 44. I have. A feed bar 33 supports the feed dog 34 at the center. A forked portion 46 at the left end is loosely fitted to the square piece 45, and a right end is connected to the upper end of the horizontal feed bar arm 6.

This second prior art has the above-described configuration, and the operation thereof will be described below. 5 is a state in which the solenoid 24 is not excited. In this state, the feed adjusting body 1 is actuated by the action of the feed adjusting spring 22.
Are acting counterclockwise about the conversion shaft 18. This action force first pulls down the feed conversion link 16, rotates the feed adjuster 12 counterclockwise about the conversion shaft 18, and the lower cam surface 14 contacts the tip of the feed adjustment knob 15. The feed adjusting body 1 is locked at a fixed position. Further, as described above, when the feed conversion link 16 is pulled down, the conversion lever 20 is pushed upward by the bent portion 38 of the interlocking plate 39. Further, the turning force by the feed adjusting spring 22 is transmitted to the plunger 25 of the solenoid 24 through the link 43 and the rotating link 26.
The lower position is maintained.

In this state, when the sewing machine is driven and the upper shaft is rotated, first, the horizontal feed rod 8 reciprocates left and right by the eccentric cam 37, whereby the swing piece 3a as the swing body is formed.
Slides back and forth along the groove 36 of the feed adjusting body 1. The sliding of the rocking piece 3a causes the groove 36 to slide along a straight line having a horizontal moving component, so that the horizontal feed shaft 4 is reciprocally rocked via the connecting link 7. The reciprocating swing of the horizontal feed shaft 4 causes the feed dog 34 to reciprocate in the horizontal direction via the horizontal feed base arm 6 and the feed base 33. When the upper shaft rotates, the upper and lower feed shafts 30 associated therewith also rotate, and via the eccentric cam 44, the square piece 45, and the feed base 33,
The feed dog 34 is reciprocated vertically.

The reciprocating movement of the feed dog 34 in the horizontal direction;
By the combined movement with the vertical reciprocation of the feed dog 34, the feed dog 34 makes four movements of cloth feed in the forward direction to feed the cloth in the forward direction. During the cloth feeding in the forward direction, the solenoid 24 is excited by automatic or manual operation, and the plunger 25 is pulled upward against the feed adjusting spring 22. As a result, the rotating link 26 rotates clockwise about the shaft 42 to rotate the conversion shaft 18 clockwise via the link 43 and the interlocking plate 39. Due to the rotation of the conversion shaft 18, the feed adjuster 12 also rotates clockwise about the conversion shaft 18 to move the upper cam surface 14 to the feed adjustment knob 15.
And the feed adjusting body 1 is locked at that position. By the rotation of the feed adjuster 12, the feed adjusting body 1 is rotated via the feed conversion link 16, whereby the inclination of the groove 36 of the feed adjusting body 1 with respect to the horizontal line is reversed from the front direction, and the eccentric cam 37 is formed. The phase of the sliding movement of the swing piece 3a is opposite to the phase of the cloth feeding in the forward direction.

In this state, when the sewing machine is driven and the upper shaft 9 rotates, the feed dog 3 is moved in the same manner as the cloth feed in the forward direction.
4 performs four movements of cloth feed, but since the sliding phase of the swinging piece 3a is opposite to the phase of cloth feed in the forward direction, the reciprocating movement of the feed dog 34 in the horizontal direction and the feed By the combined movement with the vertical reciprocation of the teeth 34, the feed dog 34 performs four movements of cloth feeding in the opposite direction to feed the cloth in the opposite direction.

When the solenoid 24 is demagnetized, the feed adjusting body 1 is rotated counterclockwise by the elastic force of the feed adjusting spring 22, and each part returns to the original cloth feeding phase in the normal direction.

[0023]

Next, problems of the first and second prior arts described above will be described. First, FIG.
In the first prior art shown in FIG. 1, the solenoid 24 is disposed horizontally, and in order to demagnetize the solenoid 24 and return the feed adjusting body 1 to the normal feed state, only the elastic force of the feed adjusting spring 22 is used. Return by force.

In order to instantly return the feed adjusting body 1 to the normal feed state, the elasticity of the feed adjusting spring 22 must be increased. In order to reverse the cloth feed direction, the solenoid 24 must be excited against the elastic force of the strong feed adjusting spring 22, so the solenoid 24 needs to be large. Therefore, there is a problem that the temperature inside the bed increases due to heat generation, the power consumption increases, and the cost increases.

In the second prior art shown in FIGS. 5 and 6, the solenoid 24 is arranged vertically.
As shown in FIG. 6, since the solenoid 24 is disposed outside the arm 41, noise is generated every time the solenoid 24 is excited or demagnetized and the cloth feeding direction is changed. The work environment deteriorates, and there is a problem in design.

[0026]

According to a first aspect of the present invention, there is provided a cloth feeder which is connected to a horizontal feed shaft and a vertical feed shaft and causes a feed dog to perform four cloth feed movements. An oscillating body that makes a constant reciprocating motion by a crank mechanism of a rotating shaft, a connecting link that connects the oscillating body and a horizontal feed shaft, and supports the oscillating body, and by changing the oscillating position of the oscillating body, A feed adjuster capable of adjusting a swing amount and a swing direction of a horizontal feed shaft, a feed adjuster rotatably supported by an arm and forming two symmetric cam surfaces,
An adjusting knob whose tip is screwed into the cam and has a tip facing the cam surface of the feed adjuster; a feed conversion link connecting the feed adjuster to the feed adjuster; An elastic body to be pressed against the surface, and a solenoid supported by the arm and connected to the hanging plunger and connected to the feed adjusting body and rotating the adjusting body against the elastic body by its excitation. .

According to the first aspect of the present invention, the size of the solenoid can be reduced, so that the calorific value is reduced as compared with the conventional one, the temperature in the bed can be reduced, the power consumption is reduced, and the cost is reduced. This has the effect of being cheaper and being more economical. Further, the solenoid 24 is connected to the arm 41.
When the cloth feed direction is changed by the solenoid 24 being excited or demagnetized,
Since no noise is generated outside, the working environment is good and the design is excellent.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. Note that components having the same configuration and operation as the conventional technology will be described using the same component names and numbers as the conventional technology. First, a first embodiment will be described with reference to FIGS.

Reference numeral 1 denotes a feed adjusting body, and a shaft 2 at the center thereof
Are rotatably supported by a bed of a sewing machine (not shown). Reference numeral 3 denotes a swing link as a swing body, the base of which is rotatably supported by the feed adjusting body 1. Reference numeral 4 denotes a horizontal feed shaft, which is rotatably supported by a bed of a sewing machine (not shown), a horizontal feed arm 5 is fixed to the rear, and a horizontal feed arm 6 is fixed to the front.

Reference numeral 7 denotes a connecting link, the lower end of which is rotatably connected to the horizontal feed arm 5. Reference numeral 8 denotes a horizontal feed rod, one end of which is loosely fitted to an eccentric cam 37 provided on the vertical feed shaft 4, and the other end of which is connected to one end of the swing link 3 and the right end of the connection link 7 by the shaft 11. . Numeral 12 denotes a feed adjuster, whose center is rotatably supported by an arm 41 of the sewing machine by a shaft 13, and two cam surfaces 14 are formed at one end.

Numeral 15 denotes an adjusting knob having a threaded portion screwed into the arm 41 of the sewing machine. The tip of the adjusting knob 15 is opposed to the cam surface 14 of the feed adjuster 12. Reference numeral 47 denotes an interlocking shaft rotatably supported by the bed 40 of the sewing machine.
a, an interlocking arm 47b is fixed to the right end, and an interlocking arm 47c is fixed to the left end.

Reference numeral 16 denotes a feed conversion link. The upper end is connected to one end of the feed adjuster 12, the lower end is connected to an interlocking arm 47a, and an engaging portion 17 is formed at the center. Reference numeral 18 denotes a conversion shaft rotatably supported by the arm of the sewing machine. A conversion arm 19 is fixed to the left end, and a base of the conversion lever 20 is fixed to the right end.

Reference numeral 21 denotes a pin supported by the conversion arm 19, which is located below the engaging portion 17 of the conversion arm 19.
Reference numeral 22 denotes a feed adjusting spring which is stretched between a hook pin 23 provided on the feed adjusting body 1 and an arm 41 of the sewing machine. Reference numeral 24 denotes a solenoid having a plunger 25 which hangs in a vertical direction, and is fixed inside an arm 41 of the sewing machine.
The lower end of the plunger 25 and the interlocking arm 47a are linked by link 4
8 are connected.

An interlocking link 49 connects the interlocking arm 47b and the feed adjuster 1. A vertical feed shaft 30 rotates in conjunction with the rotation of an upper shaft (not shown), and an eccentric cam 50 is fixed to the left end. ing. Reference numeral 33 denotes a feed table, which supports a feed dog 34 at the center and has a left end loosely fitted to the eccentric cam 50.
2 and the right end is connected to the horizontal feed arm 6.

The first embodiment has the above configuration, and the operation will be described below. 1 is a state in which the solenoid 24 is not excited. In this state, the feed adjusting spring 1 is actuated by the feed adjusting spring 22.
Numeral 2 receives a rotating power in the counterclockwise direction about the shaft 13.
This action force first pulls down the feed conversion link 16, rotates the feed adjuster 12 counterclockwise about the shaft 13, and the lower cam surface 14 contacts the tip of the feed adjustment knob 15, The feed adjuster 12 is locked in a fixed position. Further, as described above, when the feed conversion link 16 is pulled down, the engaging portion 17 pushes down the pin 21 to rotate the conversion shaft 18 in the counterclockwise direction, whereby the conversion lever 20 is moved. It has been pushed up. Further, the acting force of the feed adjusting spring 22 is applied to the feed conversion link 1.
6 to the interlocking shaft 47 via the interlocking arm 47a,
The interlocking shaft 47 is rotated clockwise. This allows
First, the plunger 25 of the solenoid 24 is maintained at the lower position via the interlocking arm 47c.
, The feed adjusting body 1 is maintained in a state of being rotated counterclockwise.

In this state, when the sewing machine is driven and the upper shaft is rotated, first, the horizontal feed rod 8 reciprocates left and right by the eccentric cam 37, whereby the swing link 3 as a swing body is moved.
Reciprocates around the lower part supported by the feed adjusting body 1. Due to the swing of the swing link 3, the shaft 11 swings along an arc having a horizontal moving component, so that the horizontal feed shaft 4 is reciprocated through the connecting link 7. The reciprocating swing of the horizontal feed shaft 4 causes the feed dog 34 to reciprocate in the horizontal direction via the horizontal feed base arm 6 and the feed base 33. Further, when the upper shaft rotates, the vertical feed shaft 30 that rotates therewith also rotates, and the feed dog 34 is reciprocated in the vertical direction via the eccentric cam 50, the vertical feed arm 32, and the feed base 33.

The reciprocating movement of the feed dog 34 in the horizontal direction;
By the combined movement with the vertical reciprocation of the feed dog 34, the feed dog 34 makes four movements of cloth feed in the forward direction to feed the cloth in the forward direction. During the cloth feeding in the forward direction, when the solenoid 24 is excited against the feed adjusting spring 22 by automatic or manual operation, the plunger 25 is raised, and the interlocking shaft is connected via the link 48 and the interlocking arm 47c. 47 is rotated counterclockwise.

Thus, the feed adjusting body 1 is rotated clockwise about the shaft 2 via the interlocking link 49. By this rotation, the feed conversion link 1 is connected via the interlocking arm 47a.
6, the feed adjuster 12 is rotated clockwise about the shaft 13 to bring the upper cam surface 14 into contact with the tip of the feed adjusting knob 15, and the feed adjusting body 1 is moved to the above position. Locked. By the rotation of the interlocking shaft 47, the position of the swing link 3 supported by the feed adjustment body 1 changes, and the phase of the swing of the swing link 3 by the eccentric cam 37 becomes the phase of the cloth feeding in the forward direction. The opposite is true.

In this state, when the sewing machine is driven and the upper shaft rotates, the feed dog 34 is moved in the same manner as the cloth feed in the forward direction.
Makes four movements of cloth feed, but since the swing phase of the swing link 3 is opposite to the cloth feed phase in the forward direction, the horizontal reciprocation of the feed dog 34 and the feed tooth By the combined movement with the vertical reciprocation of 34, the feed dog 34 performs four movements of cloth feeding in the opposite direction to feed the cloth in the opposite direction.

When the solenoid 24 is demagnetized, the interlocking shaft 47 is rotated clockwise by the weight of the plunger 25 of the solenoid 24 and the elastic force of the feed adjusting spring 22, and the respective parts return to the original forward direction. It returns to the cloth feeding phase. Next, a second embodiment will be described with reference to FIG. In this embodiment, components having the same configuration and operation as those of the conventional technology will be described using the same component names and numbers as those of the conventional technology.

Reference numeral 1 denotes a column-shaped feed adjusting body having an interlocking shaft 47, which is rotatably supported on the bed of the sewing machine, and an interlocking arm 47c is fixed to the right end of the interlocking shaft 47. 3a
Is a swing piece as a swing body, and a groove 36 of the feed adjusting body 1
Slidably supported by A horizontal feed shaft 4 is rotatably supported on the bed of the sewing machine, a horizontal feed arm 5 is fixed to the rear, and a horizontal feed arm 6 is fixed to the front.

Reference numeral 7 denotes a connecting link, whose upper end is rotatably connected to the horizontal feed arm 5. Reference numeral 8 denotes a horizontal feed rod. The left end is loosely fitted to an eccentric cam 37 provided on the vertical feed shaft 30 which rotates in conjunction with the upper shaft of the sewing machine, and the right end is connected to the swinging piece 3 a and the lower end of the connection link 7. Have been. 12
Is a feed adjuster, the center of which is rotatably supported on the arm of the sewing machine by means of a shaft 12 and has two symmetrical cam surfaces 14 at one end.
Are formed.

Numeral 15 denotes an adjusting knob having a threaded portion screwed into the arm of the sewing machine. The tip of the adjusting knob 15 is opposed to the cam surface 14 of the feed adjuster 12. A feed conversion link 16 has an upper end connected to one end of the feed adjuster 12, a lower end connected to the horizontal feed arm 5, and an engaging portion 17 formed at the center.

Reference numeral 18 denotes a conversion shaft rotatably supported by the arm of the sewing machine. A conversion arm 19 is fixed to the left end, and a base of the conversion lever 20 is fixed to the right end. Reference numeral 21 denotes a pin supported by the conversion arm 19, and an engagement portion 1 of the conversion arm 19
7 below. Reference numeral 22 denotes a feed adjusting spring which is provided between a hook pin 23 provided on the feed adjusting body 1 and an arm of the sewing machine.

Reference numeral 24 denotes a plunger-2 hanging vertically.
5 is fixed inside the arm of the sewing machine, and the lower end of the plunger 25 and the interlocking arm 47c are connected by a link 48. An upper and lower feed shaft 30 rotates in conjunction with the rotation of the upper shaft. An eccentric cam 44 is fixed to the left end, and a square piece 45 is loosely fitted around the outer periphery of the eccentric cam 44.

Reference numeral 33 denotes a feed table, which supports the feed dog 34 at the center, a forked portion 46 at the left end is loosely fitted to the square piece 45, and a right end is connected to the upper end of the horizontal feed table arm 6. . The second embodiment has the above configuration, and the operation will be described below. The state shown in FIG. 3 is a state in which the solenoid 24 is not excited. In this state, the feed adjustment body 1 rotates counterclockwise around the conversion shaft 18 by the action force of the feed adjustment spring 22. is recieving. This force is
First, the feed conversion link 16 is lowered, and the feed adjuster 1
2 is rotated counterclockwise about the shaft 12, the lower cam surface 14 abuts on the tip of the feed adjustment knob 15, and the feed adjustment body 1 is locked at a fixed position. Further, as described above, when the feed conversion link 16 is pulled down, the engagement portion 17 of the feed conversion link 16 pushes the pin 21 of the conversion arm 19 downward, and rotates the conversion shaft 18 counterclockwise. , Conversion lever 20 has been pushed upward. Further, the acting force of the feed adjusting spring 22 maintains the plunger 25 of the solenoid 24 at the lower position via the interlocking shaft 47, the interlocking arm 47c, and the link 48.

In this state, when the sewing machine is driven and the upper shaft is rotated, first, the horizontal feed rod 8 reciprocates right and left by the eccentric cam 37, whereby the swing piece 3a as the swing body is formed.
Slides back and forth along the groove 36 of the feed adjusting body 1. The sliding of the rocking piece 3a causes the groove 36 to slide along a straight line having a horizontal moving component, so that the horizontal feed shaft 4 is reciprocally rocked via the connecting link 7. The reciprocating swing of the horizontal feed shaft 4 causes the feed dog 34 to reciprocate in the horizontal direction via the horizontal feed base arm 6 and the feed base 33.

When the upper shaft rotates, the upper and lower feed shafts 30 associated therewith also rotate, causing the feed dog 34 to reciprocate in the vertical direction via the eccentric cam 44, the square piece 45, and the feed base 33. The horizontal reciprocation of the feed dog 34 and the feed dog 3
The feed dog 34 makes four movements of cloth feeding in the forward direction by the combined movement with the vertical reciprocation of 4 to feed the cloth in the forward direction.

During the cloth feeding in the forward direction, the solenoid 24 is excited by an automatic or manual operation, and the plunger 25 is pulled upward against the feed adjusting spring 22.
Thus, the interlocking shaft 47 is rotated clockwise through the link 48 and the interlocking arm 47c. By the rotation of the interlocking shaft 47, the feed adjuster 12 also rotates clockwise about the conversion shaft 18 to bring the upper cam surface 14 into contact with the tip of the feed adjustment knob 15, and the feed adjuster 1 is moved. Locked in that position. By the rotation of the interlocking shaft 47, the feed adjusting body 1 is rotated, whereby the inclination of the groove 36 of the feed adjusting body 1 with respect to the horizontal line is opposite to the front direction, and the sliding of the swing piece 3a by the eccentric cam 37 is performed. The phase is opposite to the phase of the cloth feeding in the forward direction.

When the sewing machine is driven from this state and the upper shaft rotates, the feed dog 34 is moved in the same manner as the cloth feed in the forward direction.
Makes four movements of cloth feed, but since the sliding phase of the swinging piece 3a is opposite to the phase of cloth feed in the forward direction, the reciprocating movement of the feed dog 34 in the horizontal direction and the feed tooth By the combined movement with the vertical reciprocation of 34, the feed dog 34 performs four movements of cloth feeding in the opposite direction to feed the cloth in the opposite direction.

When the solenoid 24 is demagnetized, the gravity of the plunger 25 of the solenoid 24 and the feed adjusting spring 2
Due to the elastic force of 2, the interlocking shaft 47 is rotated in the counterclockwise direction, the feed adjusting body 1 is rotated in the counterclockwise direction, and each portion returns to the original cloth feeding phase in the normal direction.

[0052]

As described above, according to the present invention, in order to change the cloth feeding direction, a solenoid which is excited against the elastic force of a spring is provided inside the sewing machine arm with its plunger suspended. Since the solenoid is demagnetized and the respective parts return to the original cloth feeding phase in the positive direction by the elastic force of the spring, the weight of the plunger of the solenoid is added to the action direction of the elastic force of the spring. The elastic force of the spring can be made smaller than the conventional one.

For this reason, since the size of the solenoid can be made smaller than that of the conventional one, the calorific value becomes smaller than that of the conventional one, so that the temperature in the bed can be lowered, the power consumption is reduced, and the cost is reduced. It also has the effect of being cheaper and being more economical. In addition, the solenoid
When the cloth feed direction is changed due to excitation or demagnetization of the solenoid due to being placed inside the system, no noise is generated.
There are effects such as excellent design.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cloth feeder according to a first embodiment of the present invention.

FIG. 2 is a side view of the cloth feeder according to the first embodiment of the present invention;

FIG. 3 is a perspective view of a cloth feeder according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a cloth feeding device as a first conventional example.

FIG. 5 is a perspective view of a cloth feeder as a second conventional example.

FIG. 6 is a side view of a cloth feeder as a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Feed adjustment body 3 Oscillating link (oscillating body) 3a Oscillating piece (oscillating body) 4 Horizontal feed shaft 5 Horizontal feed arm 7 Connecting link 12 Feed adjuster 15 Adjustment knob 16 Feed conversion link 20 Conversion lever 22 Feed adjustment spring 24 Solenoid 25 Plunger 30 Vertical feed shaft 32 Vertical feed arm 40 Bed 41 Arm

Claims (1)

[Claims] 1. A horizontal feed shaft and a vertical feed shaft are connected to each other,
In a cloth feed device for causing a feed dog to perform four cloth feeding motions, an oscillating body that performs a constant reciprocating motion by a crank mechanism of a rotating shaft; a connecting link that connects the oscillating body to a horizontal feed shaft; A feed adjuster that supports and adjusts the swing amount and swing direction of the horizontal feed shaft by changing the swing position of the oscillator, and a feed adjuster that is rotatably supported by the arm and has two symmetrical positions. A feed adjuster formed with a cam surface, an adjusting knob screwed into an arm and having a tip facing the cam surface of the feed adjuster; a feed conversion link connecting the feed adjuster and the feed adjuster; An elastic body for bringing the tip of the adjusting knob into pressure contact with one cam surface of the feed adjuster, and a plunger supported in the arm and hanging therefrom are connected to the feed adjuster. A solenoid for rotating the adjusting body. Cloth feeding device of a sewing machine, characterized in that the