JPH0112710Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is based on a reversible cloth feeding device of a sewing machine,
More specifically, the present invention relates to a feed switching mechanism that switches the cloth feed direction of the feed dog.

(Prior art) Conventionally, this type of cloth feeding device has a
There is a feed conversion mechanism for a sewing machine described in Japanese Patent No. 59-26955.

This feed conversion mechanism switches the cloth feeding direction of the feed dog by reversing the phase of the horizontal feed cam by approximately 180 degrees to impart horizontal feed motion to the feed dog, as shown in Figure 6. A horizontal feed cam 2 is slidably and rotatably disposed on the drive shaft 1, and the fork portion 4 of the feed fork 3 is engaged with the feed cam 2, and a pair of left and right feed cams are disposed on the drive shaft 1. engaging body 5,
6 are fixed with a predetermined gap across the horizontal feed cam 2, and the horizontal feed cam 2 is connected to one of the engaging bodies 5, 6 by operating the operating body 7.
The cloth feeding direction can be switched by being selectively connected to. In order to buffer the impact related to the movement of the horizontal feed cam 2 at the time of switching the feed direction, that is, the impact of the engagement of the horizontal feed cam 2 with the engaging bodies 5 and 6, the operating body 7
It has been common practice to insert a spring between the manual member and the manual member connected to the operating body 7.

(Problems to be solved by the invention) In the conventional feed conversion mechanism described above, a special shock absorbing spring is arranged to reduce the shock when the feed dog changes the feed direction. is complicated, has a large number of parts, and is difficult to assemble.
In the end, the problem was that the cost was high.

(Means for Solving the Problems) The present invention to solve the problems in the conventional techniques described above is based on a feed dog that performs four-movement feed in synchronization with the vertical movement of the sewing needle, and a horizontal feed cam rotatably fitted onto a drive shaft that is rotationally driven in relation to the horizontal feed cam; A connection capable of connecting an operating member that engages and operates, the horizontal feed cam and the drive shaft in either a predetermined normal feed connection state or a reverse feed connection state having an angular phase difference of about 180 degrees. and one member of the horizontal feed cam and the connecting member relative to the other member in the axial direction of the drive shaft to reversibly switch the connection state of the horizontal feed cam and the drive shaft. In the sewing machine, the operating body is configured to be movable in a direction parallel to the drive shaft, and the horizontal feed cam and the one member of the connecting member are connected to the operating body. This is a reversible fabric feeding device for a sewing machine, the gist of which is that an elastic member having elasticity against bending or torsional force is pivotally supported on the sewing machine frame to operatively connect the two.

(Function) According to the above means, by operating the operating body, the horizontal feed cam or the connecting member is moved in the axial direction on the drive shaft via the elastic member, and the horizontal feed cam is moved relative to the drive shaft. When connected with the phase reversed by about 180 degrees, when the direction of the horizontal feed movement of the feed dog is switched, the elastic member acts as a connecting member or a switching member for the horizontal feed cam, and at the same time resists its elasticity. The deflection caused by bending or twisting reduces the impact when switching the feeding direction of the feed dog, and the impact is less likely to be transmitted to the operating body, resulting in good operability.

(Example) An example of this invention will be described below with reference to FIGS. 1 to 5. In FIG. 1 showing a partially cutaway front view of a reversible cloth feeding device of a sewing machine, and FIG. 2 showing a top view of the same,
0, a plate-shaped support substrate 11 is vertically attached by fixing screws 12-12. The support board 11 roughly divides the inside of the bed 10 into front and rear halves, and the components of the cloth feeding device are arranged in front and behind the support board 11 as follows. Further, a substantially U-shaped support frame 13 is attached to the substantially central portion of the front surface of the support substrate 11 by mounting screws 14-14. Note that the support substrate 11 corresponds to a part of the sewing machine frame.

A drive shaft 15 extending in the front-rear direction is rotatably installed between the support substrate 11 and the support frame 13. The rear end portion of the drive shaft 15 projects toward the rear of the support substrate 11 and is linked to a drive motor via a belt transmission mechanism mainly including a timing belt (not shown). The drive shaft 15 is rotationally driven by a drive motor in association with the vertical movement of a sewing needle (not shown) of the sewing machine.

A triangular horizontal feed cam 16 is eccentrically and rotatably fitted into the center of the drive shaft 15 . A substantially rectangular cam hole 18 of a plate-shaped actuating member 17 is engaged with the horizontal feed cam 16 . The actuating member 17 makes a reciprocating motion accompanied by vertical movement due to the rotation of the horizontal feed cam 16 and horizontal movement (horizontal direction) due to a feed adjuster B, which will be described later.

The cloth feeding device can be roughly divided into operating members 1 and 1.
a feed movement mechanism A that horizontally feeds a feed dog (not shown) based on the movement of 7; and the actuating member 1.
a feed adjuster B that adjusts and sets the amount of horizontal feed movement of the feed dog by adjusting the amount of horizontal movement of the feed dog 7; and a feed switch that switches the rotation of the horizontal feed cam 16 with an angular phase difference of about 180 degrees. It is composed of mechanism C. Below, the feed movement mechanism A, the feed adjuster B, and the feed switching mechanism C will be sequentially explained.

First, the feed movement mechanism A will be described. An interlocking arm 20 is rotatably supported on a support shaft 19 protruding from the front surface of the left end of the support substrate 11 on the front surface of the support substrate 11 . The left end of the actuating member 17 is rotatably connected to the upper end of the interlocking arm 20 via a pin 21 parallel to the support shaft 19 . At the left end of the interlocking arm 20, an operating shaft 22 having a bifurcated portion 23 at the front end is connected to the support shaft 1.
It is rotatably supported on a shaft parallel to 9.

A horizontal feed shaft 25 protrudes leftward from the rear end of the horizontal feed arm 24 adjacent to the left side of the interlocking arm 20, and the same shaft 25 is rotatably supported at the bottom of the bed 10. has been done. At the front end of the horizontal feed arm 24, an interlocking shaft 26 is parallel to the horizontal feed shaft 25 and protrudes to the right, and this shaft 26 is engaged with the bifurcated portion 23 of the operating shaft 22.

Therefore, when the actuating member 17 is actuated by the rotation of the horizontal feed cam 16, the interlocking arm 2
0 is swung around the support shaft 19, and in conjunction with this, the horizontal feed arm 24 is swung around the horizontal feed shaft 25 via the operating shaft 22. This horizontal feed shaft 25
As is well known, the rotation is transmitted to a feed table (not shown), and together with the feed table, the feed dog is horizontally moved in the front-rear direction. The feed table is moved up and down by a well-known up and down movement mechanism (not shown), and by its cooperation, the feed dog is rotated four times in synchronization with the up and down movement of the sewing machine's sewing needle (not shown). Exercise sent. This four-movement feed of the feed dog is normally a normal feed that sends the cloth to the rear of the bed 10, and the rotation of the horizontal feed cam 16 is controlled by a feed switching mechanism C (described later) to an angular position of about 180 degrees. By switching with a phase difference, it is possible to switch to reverse feeding in which the fabric is returned to the front of the bed 10.

Next, feed adjuster B will be described. A square piece-shaped sliding member 27 is provided on the back side of the right end of the operating member 17.
is rotatably attached by a pin 28.

The sliding member 27 has a guide groove 30 on the front surface of the adjusting member 29.
is slidably engaged with. The adjustment member 29 is
It is fixed to the front end of a rotation shaft 31 that is rotatably supported by the support substrate 11 in a state that projects in the front-rear direction. Therefore, depending on the inclination angle of the adjustment member 29 due to the rotation of the rotation shaft 31 (in this example, the angle at which the upper end of the adjustment member 29 is inclined to the left in FIG. 1), the sliding member 27 moves into the guide groove. 30, horizontal movement is imparted to the actuating member 17 as the actuating member 17 moves up and down due to the rotation of the horizontal feed cam 16, and as a result, the movement of the actuating member 17 through the feed movement mechanism A The feed dog is moved horizontally. That is, when the adjustment member 29 is in a vertical position, the amount of horizontal feed movement of the feed dog is 0, and as the inclination angle of the adjustment member 29 increases, the amount of the horizontal feed movement increases.

Further, a fixed shaft 32 projecting forward is provided at the right end of the support substrate 11 in parallel with the drive shaft 15 . A disk-shaped feed adjustment cam 33 is rotatably fitted to the base of the fixed shaft 32, and a snap ring 33a is attached to prevent the adjustment cam 33 from moving in the axial direction. A wave-shaped cam groove 34 whose distance from the axis of the fixed shaft 32 gradually changes is formed on the back surface of the feed amount adjusting cam 33.

A feed amount adjustment dial 35 corresponding to a feed amount adjustment operation body is integrally provided on the front surface of the feed amount adjustment cam 33 via a connecting portion 36 . In addition,
In the recess 37 on the front surface of the feed amount adjustment dial 33, a feed direction switching button (described later) 61 corresponding to a feed direction switching operation body is disposed so as to be movable in the axial direction.

A connecting link 38 is provided on the back side of the support substrate 11.
is horizontally movably supported by a set screw 40 through a horizontal elongated hole 39 in its center. A guide shaft 41 is provided protruding from the front surface of the right end of the connecting link 38 . The guide shaft 41 passes through the horizontal opening hole 42 of the support substrate 11 and connects to the feed amount adjusting cam 3.
It is engaged in the cam groove 34 of No. 3. The connecting link 38 is moved in the horizontal direction by the rotation of the feed amount adjusting cam 33 and the guide shaft 41 being guided through the cam groove 34 and the opening hole 42 .

A rotating arm 4 is attached to the left end of the connecting link 38.
3 are rotatably connected by a connecting screw 44, and the lower end of the rotary arm 43 and the rear end of the rotary shaft 31 of the adjusting member 29 are coupled. Therefore, as the connecting link 38 moves in the horizontal direction, the adjusting member 29 is tilted together with the rotating shaft 31 via the rotating arm 43, and the amount of horizontal movement relative to the operating member 17 is increased or decreased by the tilting. As a result, the amount of feed of the feed dog is adjusted.

Next, the feed switching mechanism C will be described. On the drive shaft 15, an interlocking member 45 and a connecting member 46 are sequentially lined up in front of the horizontal feed cam 16, and are fitted in such a manner that they can rotate relative to each other.

As shown in FIG. 3, the interlocking member 45 is formed into a substantially fan shape, and has an opening hole 47 at its arcuate end, and a shaft extending parallel to the drive shaft 15 at the front surface of its acute-angled end. A portion 48 is provided in a protruding manner.
The opening hole 47 of the interlocking member 45 is engaged with a protrusion 49 protruding toward the front side of the horizontal feed cam 16, and the interlocking member 45 is connected to the front surface of the horizontal feed cam 16 in contact with the front surface thereof. The axial movement of the interlocking member 45 on the drive shaft 15 and the horizontal feed cam 16 is as follows:
a snap spring 50 fixed on the drive shaft 15;
50a. Further, the connecting member 46 on the drive shaft 15 is movable in the axial direction between the snap ring 50 and the front plate portion of the support frame 13 of the support substrate 11. In addition, the above-mentioned Snut Spring 5
Some member arranged on the drive shaft 15 may be used instead of 0a.

As shown in FIGS. 3 and 4, the connecting member 46 includes two disc-shaped rotating parts 51 and 5, front and rear.
2 are integrally formed with a predetermined gap S through a pair of continuous parts 53, 53. The rotating parts 51 and 52 have through holes 5 located on the same straight line.
4 and 55 are opened, and the same rotating parts 51 and 5 are opened.
Grooves 58 and 59 are formed in the two shaft holes 56 and 57, respectively, with an angular phase difference of about 180 degrees. The interlocking member 4 is inserted into the through holes 54 and 55.
The connecting member 46 is fixedly connected to the interlocking member 45 in the rotational direction of the drive shaft 15 and movably connected in the axial direction. Note that the connecting member 46 is normally located at a rearward position adjacent to the interlocking member 45, as shown in FIG.

A cylindrical or pin-shaped engaging protrusion 60 is provided on the drive shaft 15 so that the axes thereof are perpendicular to each other. The engaging protrusion 60 can selectively engage with the grooves 58 and 59 of the rotating parts 51 and 52 by the movement of the connecting member 46, and normally engages with the grooves 58 and 59 of the rotating part 51 on the front side.
is engaged with. This state is a normal feed connection state, and by moving the connection member 46 forward on the drive shaft 15 from this state, the groove 59 of the rear rotating part 52 is engaged with the engagement protrusion 60. It becomes a reverse feed connection state. Further, when the engaging protrusion 60 is located in the gap S between the rotating parts 51 and 52, both grooves 5
It is now possible to leave from August 8, 59.

Further, in the recessed portion 37 of the feed amount adjustment dial 35, a feed direction switching button 61 corresponding to a feed direction switching operation body is provided so as to be movable in the axial direction, that is, in a direction parallel to the drive shaft 15. is mated to. The boss portion 62 of the switching button 61 is projected to the rear of the feed amount adjustment dial 35 through the through hole 63 on the bottom surface of the recess 37, and the shaft hole 64 of the boss portion 62 is moved in the axial direction toward the fixed shaft 32. It can be inserted easily. A coil spring 65 is inserted between the end face of the boss portion 62 of the switching button 61 and the snap spring 33a facing it, and is inserted into the fixed shaft 32. Therefore, the switching button 61 is always placed in the front position (see FIG. 2).

On the front surface of the support substrate 11, a support bracket 66 connects the connection member 46 and the feed direction switching button 6.
1 and is attached by a set screw 67. On the tip of the support bracket 66, there is a
The substantially central portions of the two elastic members 68 are rotatably supported by a pivot screw 69 in a substantially horizontal state. Note that the shaft portion of the pivot screw 69 serves as a pivot shaft 70.

The right end of the elastic member 68 is bent into a U-shape so as to surround the boss portion 62 of the feed direction switching button 61, and a locking pin 71 protruding inwardly fits into the engagement hole 72 below the boss portion 62. has been involved. Further, an engagement pin 73 protrudes from the lower surface of the left end of the elastic member 68, and the pin 73 is inserted between the upper ends of both the rotating parts 51 and 52 of the connecting member 46.
In other words, the left end of the elastic member 68 is pressed against and connected to the connecting member 46 while being biased by its elasticity. Therefore, the elastic member 68 operatively connects the connecting member 46 and the feed direction switching button 61. Further, the connecting member 46 is configured in a band shape such that the dimension in the axial direction of the pivot shaft 70 is sufficiently smaller than the dimension in the direction perpendicular to the pivot shaft 70, and when the switching button 61 is operated to move. Torsional force acts.

In the reversible cloth feeding device of the sewing machine described above, as shown in FIGS. 1 and 2, during normal sewing, the feeding direction switching button 61 is urged toward the forward position by the elasticity of the coil spring 65. The connecting member 46 is connected to the interlocking member 45.
The engagement protrusion 60 of the drive shaft 15 is in a state of being engaged with the groove 58 of the rotating part 51 on the front side.

Therefore, when the drive shaft 15 is actively rotated by the drive motor, the connecting member 46 is rotated via the front rotating portion 51, and at the same time, the horizontal feed cam 16 is rotated via the interlocking member 45. As a result, the actuating member 17 is subjected to a compound movement in the vertical and horizontal directions, and the interlocking arm 20 and the horizontal feed arm 2
4 is swung, a horizontal feed motion is applied to the feed dog via the feed base. The feed dog performs four-movement feed by a compound movement of its horizontal feed movement and vertical movement via a vertical feed mechanism (not shown).
In other words, normal feeding is performed in which the feeding dog feeds the cloth to the rear of the bed 10.

Therefore, when the feed direction switching button 61 is pushed backward against the elasticity of the coil spring 65, the elastic member 68 is rotated counterclockwise in FIG. 2 about the pivot shaft 70. As a result, the connecting member 46 is moved forward on the drive shaft 15.

Then, first, the groove 58 of the front rotating part 51 is disengaged from the engaging protrusion 60 on the drive shaft 15, and the engaging protrusion 60 is relatively located in the gap S between the two rotating parts 51, 52. Therefore, the drive shaft 15 is connected to the connecting member 4.
6 is elastically engaged with the elastic member 68, it idles relative to the connecting member 46, the rotation of the drive shaft 15 is not transmitted to the connecting member 46, and the normal feeding of the feed dog stops. Then, due to the relative rotation between the drive shaft 15 and the connecting member 46, the groove 5 of the rear rotating portion 52
At the same time that the engaging protrusion 60 corresponds to the position 9, the connecting member 46 is moved further forward, and the engaging protrusion 60 is engaged with the groove 59 of the rear rotating part 52.

Therefore, before the groove 59 engages with the engagement protrusion 60, the elastic member 68 is temporarily twisted against its elasticity, and the engagement operation is performed by the restoration of the twisting force. That is, the elastic member 68 operates as a switching member for the connecting member 45, and its elasticity can alleviate the impact of the engagement between the connecting member 46 and the engagement protrusion 60 due to the movement of the connecting member 46 during switching. . This makes it difficult for the impact to be transmitted to the feed direction switching button 61, resulting in good operability.

When the groove 59 of the rear rotating portion 52 engages with the engagement protrusion 60, the rotation of the drive shaft 15 causes the connecting member 46 to
is rotated. Therefore, since the groove 59 of the rear rotating part 52 has a phase difference of about 180 degrees from the groove 58 of the front rotating part 51, the connecting member 46 is rotated with a phase of about 180 degrees. At the same time, the rotation of the horizontal feed cam 16 is also interlocked with this via the interlocking member 45, whereby the direction of the horizontal feed movement of the feed dog is reversed, and the cloth is fed forward of the bed 10, that is, it is fed backwards. .

Further, when the pressure on the feed direction switching button 61 is released, the switching button 61 is returned to the state shown in FIG. 2 due to the elasticity of the coil spring 65. Accordingly, the elastic member 68 is rotated about the pivot shaft 70, thereby causing the connecting member 4
6 is moved backwards. Then, the rear rotating part 5
After the second groove 59 is disengaged from the engagement protrusion 60, it is engaged with the groove 58 of the front rotating part 51. This engagement/disengagement operation is performed in the same manner as in the case of switching. In this case as well, the elastic member 68 operates as a switching member for the connecting member 45, as in the case of switching,
In addition, its elasticity can alleviate the impact associated with the movement of the connecting member 46 during switching, and the impact is therefore less likely to be transmitted to the feed direction switching button 61, resulting in good operability.

By this switching, the feed dog is rotated in the normal feed direction, and the cloth is sent to the rear of the bed 10.

In the above embodiment, the feed direction switching button 61
By this operation, the connecting member 4 is connected via the elastic member 68.
6 in the axial direction of the drive shaft 15, but instead, by operating the switching button 61, the horizontal feed cam 16 is moved in the axial direction of the drive shaft 15 via the elastic member 68. It is also possible to switch the drive shaft 15 and the horizontal feed cam 16 to a forward feed connection state or a reverse feed connection state. Further, in the above embodiment, the horizontal feed cam 16 and the interlocking member 45 are separate bodies, but the feed cam 16 and the interlocking member 45
It may be one with.

(Effect of the invention) In other words, the gist of this invention is the configuration described in the claims section of the utility model registration, and by operating the operating body, the horizontal feed cam or the connecting member is driven via the elastic member. When the horizontal feed cam is moved axially on the shaft and connected to the drive shaft with its phase reversed by approximately 180 degrees, and the direction of the horizontal feed movement of the feed dog is switched, the elastic member acts as a connecting member. Alternatively, while acting as a switching member for the horizontal feed cam, the impact caused by bending or torsion against its elasticity is alleviated when the feed dog changes the feed direction, and the impact is transmitted to the operating body. It is difficult to operate and provides good operability. Therefore, the dedicated shock absorbing spring that was previously required can be eliminated, and the structure is simplified.
Therefore, compared to the conventional type, the number of parts is reduced, ease of assembly is improved, and costs are significantly reduced.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a partially cutaway front view of a reversible cloth feeding device of a sewing machine, Figure 2 is a plan view of the same, and Figure 3 is a FIG. 4 is a partially cutaway perspective view of the connecting member, FIG. 5 is a plan view showing the state of the cloth feeding device when it is reversed, and FIG. 6 shows a conventional example. FIG. 3 is an explanatory sectional view of the feed conversion mechanism of FIG. 11...Support board (part of sewing machine frame), 15
... Drive shaft, 16 ... Horizontal feed cam, 17 ... Operating member, 46 ... Connection member, 61 ... Feed direction switching button (operating body), 68 ... Elastic member, B ...
Feed regulator.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A feed dog that performs four-movement feed in synchronization with the vertical movement of the sewing needle, and a drive shaft that is rotatably driven to rotate in relation to the vertical movement of the sewing needle. an actuating member that engages and operates the horizontal feed cam to impart an amount of horizontal feed movement to the feed dog in an amount adjusted and set by a feed adjuster; the horizontal feed cam and the drive; a connecting member capable of connecting the shafts in either a predetermined normal feeding connected state or a reverse feeding connected state having an angular phase difference of about 180 degrees; and one member of the horizontal feeding cam and the connecting member is connected to the other. an operating body that can be operated to reversibly switch the coupling state of the horizontal feed cam and the drive shaft by moving the member in the axial direction of the drive shaft, The operating body is configured to be operable to move in a direction, and the operating body is configured to be able to move in a direction, and to resist bending or torsional force in order to operatively connect the horizontal feeding cam and the one member of the connecting member to the operating body. A reversible cloth feeding device for a sewing machine, characterized in that one elastic member having elasticity is pivotally supported on a sewing machine frame. (2) The utility model characterized in that the elastic member is configured such that one end thereof is pressed against and connected to the horizontal feed cam and the one member of the connecting member due to its own elasticity. A reversible cloth feeding device for a sewing machine according to registered claim (1). (3) The elastic member is configured such that the dimension in the axial direction of the pivot shaft is sufficiently smaller than the dimension in the direction perpendicular to the pivot shaft, and the torsional force is elastic when the operating body is moved. A reversible cloth feeding device for a sewing machine according to claim (1) of the patented utility model, characterized in that it acts on a member.