JPH0211272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lateral feed mechanism for a sewing machine in which the lateral feed width of a feed dog is increased.

Prior Art Conventionally, a lateral feed mechanism has been constructed as shown in FIG. In FIG. 3a, a transverse feed shaft 1 is mounted on a bearing 2 so as to be able to slide in the axial direction, and a feed dog 4 is fixed to one end of this feed shaft 1 via a feed arm 3, and A feeding member 5 is provided at the other end of the shaft 1. The feeding member 5 has a rotating lever 6 supported by a shaft 6' at the upper part.
This pivot lever 6 is connected to a feed direction switching link 7 which is connected to an electric actuator (not shown). Further, as shown in FIG. 3B, a feed roller 8 is rotatably supported at the lower part of the feed member 5, and this feed roller 8 is constantly in contact with the lateral feed generating cam 10 by a leaf spring 9. Furthermore, a lateral feed cam contact 11 is protruded from the side of the feed member 5, and this lateral feed contact 11 is connected to a right feed cam 13, a straight cam 14, and a left feed cam fixed to a rotating shaft 12 parallel to the feed shaft 1. 15 is selectively contacted by operation of an electrical actuator.

Problems to be Solved by the Invention However, in this conventional feeding mechanism, the third
As shown in FIG.
When making selective contact with these cams 13 to 15
Since the cross-feeding contact 11 is moved while being pressed by a spring (not shown) without removing the cross-feeding contact 10, the electric executor is moved by a large load due to the load applied to the cross-feeding contact 11. The problem was that torque was required.

Means for Solving the Problems In order to solve the above problems, the present invention provides a sewing machine that is provided with a horizontal feed mechanism and a vertical feed mechanism for the feed dog, and provides a horizontal feed cam of the horizontal feed mechanism and a vertical feed mechanism for the horizontal feed mechanism. A left feed cam, a straight feed cam, a right feed cam, and a cut-off cam are installed on the rotating shaft to which the vertical feed cam is fixed. Transverse feed in which the feed cam contactor is moved by a transverse feed motor, and the interlocking shaft connected to the horizontal feed shaft, which is the rotation axis of the cross feed body integrated with the transverse feed cam contactor, contacts the transverse feed generation cam. A roller is provided, and a cutting-off cam contactor is connected to the interlocking shaft, and the cutting-off cam contactor is brought into contact with the cutting-off cam when the cross-feeding cam contactor moves, thereby causing contact with the transverse-feeding cam. It is characterized by separating the children by a minute distance.

Function According to the present invention, the left feed cam, the straight feed cam, and the right feed cam are further provided with a cutting-off cam, and when the cutting-off cam contact moves to select the lateral feed cam contact,
When it comes into contact with the cut-off cam, the cross-feed cam contact is separated from the left feed cam, straight-forward feed cam, and right feed cam, and when it is released, the cross-feed cam contact is moved, so the feed selection motor applies strong power. do not need.

Embodiment FIG. 1 is a perspective view of a feed mechanism of a sewing machine according to an embodiment of the present invention, in which a needle bar 17 to which a needle 16 is fixed is rotated by a crank rod 19 connected to a needle bar retainer 18. The needle bar oscillating table 20 is moved up and down by a movable table 20, and the needle bar oscillating table 20 is swung left and right by a needle swing motor 22 connected via a link 21. The feed dog 23 provided at the lower part of the needle 16 of the needle bar 17 is integrally provided with the feed arm 24, and the end 24a of the feed arm 24 has a rotating shaft 25 as a fulcrum, and the tip 24b of the feed arm 24 is It is supported so that it can move up and down.
This tip 24b also has a spring 26 connected thereto.
It is pulled downward by the rollers 27 and is always in contact with the upper and lower rollers 27. The shaft 28 of this upper and lower roller 27 is the rotation shaft 2
It is fixed to the tip 30a of the vertical feed arm 30 with 9 as the fulcrum, and is pulled downward by a spring 31, so that the lower end 30b of the vertical feed arm 30 is always in contact with the vertical feed cam 33 fixed to the rotating shaft 32. Ru.

Also, a horizontal feed cam 34 fixed to the rotating shaft 32
is rotated by a forked portion 35b of the vertical feed fork 35, one end 35a of which is fixed to the rotating shaft 25 of the feed arm 24, and a square piece 36 is attached to the shaft fixed to this forked portion 35b.
are connected, and this square piece 36 is connected to a horizontal feed adjuster 37.
is slid within the groove 37'. This horizontal feed adjuster 37 includes an adjuster arm 38, a link 39 and a rotating arm 40.
is connected to the shaft of the feed regulator motor 41 via.

Further, a left feed cam 42, a straight forward cam 43, a right feed cam 44, and a cut-off cam 45 of the horizontal feed mechanism are fixed to the rotating shaft 32, and the left feed cam 42, straight forward feed cam 43, and right feed cam 44 are used for the horizontal feed. It is contacted with the cam contactor 46. This horizontal feed cam contactor 4
Reference numeral 6 is provided at the tip of an L-shaped cross-feeding body 47, and the middle of the upper portion 47a of this cross-feeding body 47 is rotatably supported by a horizontal feed shaft 48, and one end 49a of the tip of the upper portion 47a is attached to a shaft 50. The forked support part 49 is loosely held by the tip 49b of a forked support part 49 which is rotatably supported by the forked support part 49, and this forked support part 49 is connected to the rotating shaft of the feed selection motor 53 via a link 51 and a rotating arm 52. . The lateral forked portion 47b of the lateral feeder 47 is connected to the interlocking shaft 54.
The interlocking shaft 54 is connected to one end 48a of the horizontal feed shaft 48 by a connecting portion 55, and the lateral feed roller 56 rotatably mounted on the interlocking shaft 54 is connected to the lateral feed generating cam 58. are in contact. Further, by rotating the interlocking shaft 54 with a tension spring 57 connected to the upper end of the interlocking shaft 54, the cutting cam contactor 59, which has one end fixed to the lower part of the interlocking shaft 54, It is pressed against the removal cam 45. Further, the rotating arms 60, 60 fixed to the horizontal feed shaft 48 are rotatably and slidably attached to the rotating shaft 25 of the feed arm 24. Also, horizontal feed axis 4
The other end 48b of the 8 is in contact with a plate spring 62 having one end fixed, and always presses the horizontal feed shaft 48 toward the interlocking shaft, thereby pressing the lateral feed roller 56 against the lateral feed generating cam.

Next, an overview of the operation of this embodiment will be explained. First, the needle bar 17 is swung laterally by the needle swing motor 22 via the link 21. Further, as the rotary shaft 32 rotates, the tip 30a of the vertical feed arm 30 that contacts the vertical feed cam 33 moves up and down, thereby the shaft 28 moves up and down, and the tip of the feed arm 24 that contacts the roller 27 moves up and down. As 24a moves up and down, the feed dog 23 moves up and down. Further, as the rotating shaft 32 rotates, the horizontal feed cam 34 moves up and down the fork portion 35b of the horizontal feed fork 35, and the rotation of the feed adjustment motor 41 causes the horizontal feed adjuster 3 to move up and down.
The angle of the groove 37' of No. 7 changes, and the square piece 36 sliding in this groove 37' causes the horizontal feed cam 35 to swing in a direction perpendicular to the rotating shaft 32. The feed dog 23 connected to the feed arm 24 is then swung in a direction perpendicular to the rotating shaft 32. Therefore, the feed dog 23 moves vertically and laterally due to the vertical movement of the tip 24b of the feed arm 24 and the swing of the feed arm 24 at right angles to the rotating shaft 23, making it possible to feed the cloth on the feed dog 23. can.

Further, by driving the feed selection motor 53, the bifurcated support portion 49 is rotated by the rotary arm 52 via the link 51, thereby moving the transverse feed body along the horizontal feed axis 48. , the horizontal feed cam contactor 46 is connected to the left feed cam 42 and the straight feed cam 4.
When the cams 42 to 44 rotate, the lateral feed body 47 rotates around the shaft 48 due to the unevenness of the cams other than the linear feed cam 43, and is interlocked. By moving the shaft 54 laterally, the lateral feed rollers 56 that come into contact with the inclined surface of the lateral feed generating cam 58 move the horizontal feed shaft 48 in the axial direction. As a result, the rotating arm 60 fixed to the horizontal feed shaft 48 is moved in the axial direction thereof, and the feed dog 23 is moved in the horizontal swing direction of the needle 16 via the feed arm 24. Note that when the horizontal feed cam contactor 46 is in contact with the linear cam 43, the horizontal feed shaft 48 does not move because the linear cam 43 is a perfect circle.

Here, the cut-off cam contact 59 is brought into contact with the cut-off cam 45 only when the cross-feed cam contact 46 is moved by the feed selection motor 53, but this cut-off cam 45 is As shown in Figure a, its diameter is slightly larger than the diameter of the linear cam 43, so the disconnection cam contactor 59 contacts the disconnection cam 45 as shown in Figure 2b. At this time, since the cross feed cam contact 46 is placed with a gap Δd from the left feed cam 42, the straight feed cam 43, and the right feed cam 44, the feed selection motor 53 is connected to the cross feed cam contact at the tip of the cross feed body 47. 46 can be moved smoothly.

Effects of the Invention As is clear from the above description, the present invention fixes the disconnection cam to the rotating shaft, and when selecting a cam for moving the cross-feeding cam contactor, the disconnection cam contactor connected to the interlocking shaft is fixed to the rotating shaft. By bringing it into contact with the cutting-off cam, the cross-feeding cam contactor is separated from the left-feeding cam, the straight-forward feed cam, and the right-feeding cam, so there is an advantage that the movement of the transverse-feeding cam contactor becomes smooth.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a sewing machine according to an embodiment of the present invention, FIG. 2 is a side view and front view of a cam of a lateral feed mechanism of the sewing machine, and FIG. 3 is a perspective view of a conventional lateral feed mechanism of a sewing machine. , is a view seen from below and a view showing the contact arc state between the cam and the lateral feed cam contactor. 32... Rotating shaft, 42... Left feed cam, 43... Straight feed cam, 44... Right feed cam, 45... Cutting off cam, 46... Transverse feed cam contactor, 47... Transverse feed body,
48...Horizontal feed shaft, 49...Bifurcated support part, 53...Feed selection motor, 54...Interlocking shaft, 56...Transverse feed roller, 57...Spring, 58...Transverse feed generation cam, 59...
Cut-out cam.

Claims (1)

[Claims] 1. In a sewing machine equipped with a horizontal feed mechanism and a vertical feed mechanism for feed dogs, a left feed cam, a straight feed cam, and a right feed cam are mounted on a rotating shaft to which the horizontal feed cam of the horizontal feed mechanism and the vertical feed cam of the vertical feed mechanism are fixed. and a cut-off cam, and in order to select any one of the left feed cam, straight forward feed cam, and right feed cam, the cross feed cam contactor is moved by a cross feed motor, and the cross feed cam contactor and the right feed cam are moved by a cross feed motor. A transverse feed roller that contacts the transverse feed generation cam is provided on an interlocking shaft connected to the horizontal feed shaft, which is the rotation axis of the integrated transverse feed body, and a cutting/disconnecting cam contactor is connected to the interlocking shaft. A lateral feed mechanism for a sewing machine, characterized in that a removal cam contactor is brought into contact with the removal cam when the lateral feed cam contactor moves, thereby separating the lateral feed cam contactor by a minute distance.