JPH08215447A - Cam change type zigzag switch sewing machine - Google Patents

Abstract

PURPOSE: To avoid the interference of a needle swinging cam with other parts and devices and suppress the occurrence of vibration by lowering the arrangement position of the needle swinging cam. CONSTITUTION: This cam change type zigzag stitch sewing machine is provided with a needle swinging cam 18 provided on a cam shaft 15 transmitted with the rotary motion from a drive shaft 26 and a needle bar support provided on a sliding shaft transmitted with the rocking motion via the cam coupling with the needle swinging cam 18. An intermediate shaft 12 receiving the rotary motion from the drive shaft 26 and transmitting it to the cam shaft 15 is provided between the drive shaft 26 and the cam shaft 15. The drive shaft 26 is a lower shaft, and a worm 10 and a worm wheel 11 transmitting the rotary motion from the lower shaft to the intermediate shaft 12 above are provided. The needle swinging cam 18 is arranged on a sewing machine arm vertical barrel section 3 below an upper shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam exchange type zigzag stitch sewing machine.

[0002]

2. Description of the Related Art In a conventional cam exchanging type zigzag stitch sewing machine, as disclosed in, for example, Japanese Patent Publication No. 62-10674, a compound cam having a pair of outer peripheral cam surfaces is used as a needle swinging cam, and a main shaft ( The cam shaft is directly driven by the upper shaft by disposing the cam shaft through a worm and a worm wheel that mesh with each other at right angles to the upper shaft. Therefore, the compound cam as the needle swinging cam is located on the side of the upper shaft in the sewing machine arm and above the standing body portion standing up from the sewing machine bed of the sewing machine arm.

[0003]

As described above, conventionally, the needle swing cam is driven directly from the upper shaft. Therefore, the needle swing cam is installed at a position lateral to the upper shaft, and the sewing machine arm vertical body portion. However, such a place often becomes an obstacle to the attachment of the rubber tape feeding device or the automatic presser lifting device (cloth presser lifting solenoid) used for zigzag stitching, for example. was there. Further, since the position of the needle swing cam is on the side of the upper shaft and above the sewing machine arm upright portion and is at a high position with respect to the sewing machine bed, there is a problem in that vibration is also adversely affected. there were.

Therefore, an object of the present invention is to devise the driving method of the needle swing cam to lower the position of the needle swing cam to avoid interference with other parts and devices and to generate vibration. The purpose is to provide a cam replacement type zigzag stitch sewing machine that can be suppressed.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a needle swing cam provided on a cam shaft to which a rotary motion from a drive shaft is transmitted, and the needle swing cam. In a cam exchange type zigzag stitch sewing machine including a needle bar support provided on a sliding shaft to which a swinging motion due to the cam engagement of the above is transmitted, a rotation from the drive shaft is provided between the drive shaft and the cam shaft. The structure is characterized in that an intermediate shaft that receives the motion and then transmits the motion to the cam shaft is provided.

The invention according to claim 2 is the same as claim 1.
A cam exchange type zigzag stitch sewing machine according to claim 1, wherein the drive shaft is a lower shaft, and a worm and a worm wheel for transmitting rotational motion are provided from the lower shaft to the intermediate shaft above, and the needle swing cam is provided with an upper shaft. The feature is that it is arranged on the lower body of the sewing machine arm.

[0007]

According to the invention described in claim 1, since the cam exchange type zigzag stitch sewing machine is provided with an intermediate shaft for receiving the rotary motion from the drive shaft and transmitting the rotary motion to the cam shaft, the space between the drive shaft and the cam shaft is improved. By using the intermediate shaft, the position of the cam shaft with respect to the drive shaft can be freely set, and the position of the needle swing cam can be determined while taking the auxiliary device into consideration. Therefore, it is possible to dispose the needle swing cam at a low position.

According to the second aspect of the present invention, the rotary motion from the lower shaft is transmitted to the intermediate shaft arranged above the lower shaft via the worm and the worm wheel.
Since this is a cam exchange type zigzag stitch sewing machine in which a needle swing cam is arranged on the vertical body of the sewing machine arm below the upper shaft, the position of the needle swing cam is lower than the sewing machine bed surface, and vibration can be suppressed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cam exchange type zigzag stitch sewing machine according to the present invention will be described below with reference to FIGS. First, FIG. 1 shows a configuration of a needle swinging mechanism of a cam exchange type zigzag stitch sewing machine as an example to which the present invention is applied, and shows the outline of a sewing machine arm as a virtual line in a perspective state.
2 shows the sewing machine arm as viewed from above, FIG. 3 shows the sewing machine arm upright as viewed from the opposite side, and FIG. 4 shows the sewing machine arm upright as viewed from the right side. The partial structure is shown.

1 to 4, 1 is a sewing machine bed, 2 is a sewing machine arm, 3 is a standing arm of the sewing machine arm,
4 is the upper shaft core, 5 is the needle bar core, 6 is the needle bar support, 7 is the sliding shaft,
8 is a sliding shaft core, 9 is a lower shaft core, 10 is a worm, 11 is a worm wheel, 12 is an intermediate shaft, 13 is an intermediate shaft gear, 1
4 is a cam shaft gear, 15 is a cam shaft, 15a is a cam shaft projecting end, 16 is a cam receiver, 17 is a positioning pin, 18 is a needle swing cam, 19 is a shaft hole, 20 is a cam groove, 21 is a positioning hole, 22 is a set screw, 23 is a cam engagement pin, 24 is a cam roller, 25 is a cam arm, 26 is a needle swing drive shaft, 27 is a needle swing drive arm, 28 is a connecting pin, 29 is a needle swing drive rod,
30 is a connecting pin, 31 is a sliding shaft driving member, 32 is a connecting pin, 33 is a connecting member, 34 is a connecting pin, 35 is an adjusting arm, 36 is an adjusting shaft, 37 is a partition wall, 38 is a peripheral wall, 39 is a cam. A chamber, 40 is a cover, 41 is a packing, and 42 is a presser foot lifting solenoid.

As shown in the figure, this cam exchange type zigzag stitch sewing machine has a sewing machine arm 2 fixed on a sewing machine bed 1 by a sewing machine arm standing body portion 3, and a sewing machine arm 2 above the sewing machine arm standing body portion 3. Inside, as is well known, an upper shaft (see upper shaft core 4) which is a main shaft for driving a sewing needle (not shown), a needle bar (see needle bar core 5) on the tip side thereof, and a needle bar supporting the needle bar. The support 6 and the sliding shaft 7 (see the sliding shaft core 8) are incorporated. Further, as is well known, a lower shaft (see lower shaft core 9) for driving a shuttle, which is not shown, is incorporated under the sewing machine bed 1. In the embodiment of the present invention, this lower shaft is used as a drive shaft. A needle swing mechanism that transmits the needle swing motion to the sliding shaft 7 is configured.

Although not shown, as is well known, the upper shaft is rotationally driven by a sewing machine motor through a timing belt or the like, and the lower shaft is rotationally driven by the upper shaft through a timing belt or the like. The needle bar receives vertical movement from the upper shaft through a crank mechanism or the like, and the needle bar is attached to the upper shaft so as to be movable along the axial direction.

The needle swinging mechanism includes a worm 10 provided at the tip of a lower shaft (see the lower shaft core 9), a worm wheel 11 that meshes with the worm 10 from above, and an intermediate shaft 12 provided with the worm wheel 11. An intermediate shaft gear 13 provided on the intermediate shaft 12, a cam shaft gear 14 meshing with the intermediate shaft gear 13 from above, a cam shaft 15 provided with the cam shaft gear 14, and a cam shaft 15 provided on the cam shaft 15. Cam receiver 1
6 and a needle swing cam 18 fixed to the cam receiver 16,
An engagement pin 23 that engages with a cam groove 20 on the side surface of the needle swing cam 18 (see also FIG. 5 above), a cam arm 25 provided with the engagement pin 23, the cam arm 25 and the needle swing drive shaft. 26
Via a needle swing drive arm 27, a needle swing drive rod 29 connected to the needle swing drive arm 27 via a connecting pin 28, and a needle swing drive rod 29 via a connecting pin 30. Sliding shaft drive member 31 connected thereto, connecting member 33 connected to this sliding shaft drive member 31 via a connecting pin 32, said sliding shaft 7 and said needle bar connected to this connecting member 33 It is composed of a presser foot 6 and the like.

That is, the worm wheel 11 and the intermediate shaft 1
2, intermediate shaft gear 13, cam shaft gear 14, cam shaft 15, cam receiver 16, needle swing cam 18, cam arm 25, needle swing drive shaft 26, needle swing drive arm 27, and needle swing drive rod 29.
Is provided on the sewing machine arm upright portion 3, and above the sliding arm drive member 31, the connecting member 33, and the adjusting arm 3.
5 and an adjusting shaft 36 are provided. The worm wheel 11, the intermediate shaft 12, the intermediate shaft gear 13, the cam shaft gear 14, the cam shaft 15, the needle swing drive shaft 26, the needle swing drive arm 27, and the needle swing drive rod 29 of the sewing machine arm upright portion 3. The sliding shaft driving member 31, which is housed inside,
The connecting member 33, the adjusting arm 35, and the adjusting shaft 36 are housed inside the sewing machine arm 2 above the connecting member 33.

Further, the cam receiver 16, the needle swing cam 18, and the cam arm 25 are separated from the inside by a partition wall 37 on the side surface of the sewing machine arm standing body 3, and a cam chamber 39 is surrounded by a peripheral wall 38. It is housed inside, and a cover 40 for sealing is attached to an outer opening of the side surface of the cam chamber 39 with a packing 41 interposed. A cloth presser lifting solenoid 42 is attached to the side surface of the sewing machine arm 2 on the cam chamber 39 side above the sewing machine arm upright portion 3.

The needle swinging mechanism will be described in detail. First, the worm 10 at the tip of the lower shaft (see the lower shaft core 9).
An intermediate shaft 12 to which a worm wheel 11 meshing with the above is fixed is supported by a bearing at the lowermost portion of the sewing machine arm standing body 3 which is close to the sewing machine bed 1. A cam shaft 15 having a cam shaft gear 14 fixed to the intermediate shaft gear 13 on the intermediate shaft 12 from above is supported by a bearing in the middle part of the sewing machine arm standing body part 3 to a slightly lower position.

This cam shaft 15 is used for the sewing machine arm standing body portion 3.
One end faces the inside of a cam chamber 39 that is surrounded by the peripheral wall 38 and protrudes outward from the partition wall 37 on the side surface of which the cam receiver 16 is fixed. The cam receiver 16 has a positioning pin 17 protruding to the outer side surface. The positioning pin 17 has a guide function for promptly inserting the needle swing cam 18 into a positioning hole 21 described later. , A chamfer on the outer periphery (see FIGS. 3 and 4).
See).

The needle swing cam 18 has a disk shape and has a shaft hole 19 into which the cam shaft 15 is inserted, and a cam groove 20 having a continuous shape around the side surface facing the cam receiver 16. Forming the positioning pin 1
A positioning hole 21 into which 7 is fitted is formed. This needle swing cam 18 is attached to the shaft hole 19 by the cam receiver 1
The cam shaft projecting end portions 15a from the six side surfaces are inserted, the positioning pins 17 are fitted into the positioning holes 21, and then the three setscrews 22, 22, 22 are screwed in to be fixed to the cam receiver 16.

Further, in the cam groove 20 of the needle swing cam 18,
An engagement pin 23 fixed to the cam arm 25 is engaged via a cam roller 24, and the cam arm 25 is fixed to an end of a needle swing drive shaft 26 protruding into the cam chamber 39. As shown in FIG. 3, the needle swing drive shaft 26 is supported on the side of the needle swing cam 18 by the sewing machine arm upright body portion 3, and is supported by the cam groove 39 on the protruding end face in the cam chamber 39. It has a slit 26a for adjusting the cam roller 24,
Furthermore, in the part facing the inside of the sewing machine arm standing body part 3,
The needle swing drive arm 27 is fixed.

A needle swing drive rod 29 is swingably connected to the tip of the needle swing drive arm 27 via a connecting pin 28. The needle swing drive rod 29 extends upward and its upper end. Sliding shaft drive members 31 are swingably connected to each other via connecting pins 30. The sliding shaft driving member 31 extends laterally and one end thereof is connected to a connecting member 33 via a connecting pin 32, and the sliding shaft 7 is fixedly connected to the connecting member 33.

At the other end of the sliding shaft drive member 31 on the side where the needle swing drive rod 29 and the connecting pin 30 are connected, an adjusting arm 35 is swingable with respect to each other via a connecting pin 34. Are linked to. In the sewing machine arm 2, the tip end of the adjusting arm 35 is swingably supported via an adjusting shaft 36. By changing the position of the adjusting shaft 36, the sliding shaft driving member 31 is swung. The sliding amount of the sliding shaft 7 can be adjusted.

In the above-described needle exchanging mechanism with the drive shaft as the lower shaft in the cam exchange type zigzag stitch sewing machine, the worm wheel 11 rotating integrally with the lower shaft decelerates and rotates the worm wheel 11 meshing with the axis orthogonal to each other. The rotation is converted to the camshaft 15 via the camshaft gear 14 that meshes with the intermediate shaft gear 12 integrated on the intermediate shaft 12 along with the worm wheel 11. Then, the cam arm 25 provided with the engaging pin 23 that engages with the cam groove 20 on the side surface of the needle swing cam 18 integrated via the cam receiver 16 on the rotating cam shaft 15 via the cam roller 24, A swing motion is integrally performed with the needle swing drive shaft 26 along the shape of the cam groove 20.

Since the needle swing drive shaft 26 is integrally provided with the needle swing drive shaft 27, the needle swing drive shaft 27 also swings integrally with the needle swing drive shaft 26, and the swing thereof is performed. The dynamic movement is performed by the needle swing drive rod 29 via the connecting pin 28.
Is converted into a combined swing motion involving the up and down motion of. Further, the combined swing motion of the needle swing drive rod 29 accompanied by the vertical motion is transmitted to the sliding shaft driving member 31 via the connecting pin 30, and the sliding shaft driving member 31 is connected to the connecting member 33. Of the adjusting arm 35 connected to the other end via the connecting pin 34 and is slidable via the connecting member 33 by the regulation by the swinging about the adjusting shaft 36 of the adjusting arm 35 connected to the other end via the connecting pin 34. The moving shaft 7 is caused to reciprocate along its axial direction. Therefore, the needle bar support 6 provided on the sliding shaft 7 integrally reciprocates in the lateral direction, and as is well known, the reciprocating motion of the needle bar in the up and down direction performed from the upper shaft through a crank mechanism or the like. The desired zigzag stitch is performed by the synthetic movement.

As described above, in the cam exchanging type zigzag stitch sewing machine, in particular, since the needle swinging mechanism in which the intermediate shaft 12 is provided between the lower shaft and the cam shaft 15 is formed, the conventional upper shaft used as the drive shaft is changed. The position of the cam shaft 15 with respect to the drive shaft can be freely set as compared with the case where the rotation is directly taken out on the cam shaft, that is, the cam shaft 15 is arranged on the sewing machine arm upright portion 3 as in the embodiment. it can. Therefore, the position of the needle swing cam 18 can be determined while taking the auxiliary device into consideration, which can contribute to the improvement of productivity. That is, even when the cloth presser lifting solenoid 42 is attached to the side surface of the sewing machine arm 2 above the sewing machine arm standing body portion 3 as in the embodiment, the needle swing cam 18 is arranged on the sewing machine arm standing body portion 3 below. it can.

Further, with the above arrangement, the position of the needle swing cam 18 can be lowered as compared with the conventional cam exchange type zigzag stitch sewing machine. As described above, since the needle swing cam 18 is positioned on the sewing machine arm upright portion 3, the position of the needle swing cam 18 is lower than the surface of the sewing machine bed 1, and therefore, the effect of suppressing the occurrence of vibration is also obtained. To be

In the above embodiments, the power transmission from the intermediate shaft to the cam shaft is performed by the gear mechanism, but the present invention is not limited to this, and the power transmission from the intermediate shaft to the cam shaft is not limited to this. The power transmission may be performed by a timing belt device. Further, the method of power transmission from the cam arm to the sliding shaft is also arbitrary, and it is needless to say that the specific detailed structure and the like can be appropriately changed.

[0027]

As described above, according to the cam exchanging type zigzag stitch sewing machine according to the first aspect of the present invention, since the intermediate shaft which receives the rotational movement from the drive shaft and transmits it to the cam shaft is provided, the drive is performed. The position of the cam shaft can be freely set with respect to the shaft, and the position of the needle swing cam can be determined while taking the auxiliary device into consideration. Therefore, it is possible to dispose the needle swing cam at a low position.

According to the cam exchanging type zigzag stitch sewing machine of the second aspect of the present invention, the rotary motion from the lower shaft is transmitted to the intermediate shaft disposed above the lower shaft via the worm and the worm wheel. Since the needle swing cam is arranged on the vertical portion of the sewing machine arm below the upper shaft, the position of the needle swing cam can be lowered relative to the surface of the sewing machine bed, thus suppressing the occurrence of vibration.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing a configuration of a needle swinging mechanism of a cam exchange type zigzag stitch sewing machine as an example to which the present invention is applied, in a perspective state with an outline of a sewing machine arm as an imaginary line.

FIG. 2 is a plan view of an essential part of the sewing machine arm portion of FIG. 1 viewed from above.

FIG. 3 is a side view of the machine arm standing body portion of FIG. 1 viewed from the opposite surface side.

FIG. 4 is a vertical cross-sectional view showing the main structure of the sewing machine arm upright portion of FIG. 1 from the right side.

5 is an exploded perspective view of respective parts of the gear portion of FIG. 1 and the needle swing cam portion of FIG.

[Explanation of symbols]

 1 Sewing machine bed 2 Sewing machine arm 3 Sewing machine arm stand 4 Upper shaft core 5 Needle bar core 6 Needle bar support 7 Sliding shaft 8 Sliding shaft core 9 Lower shaft core 10 Worm 11 Worm wheel 12 Intermediate shaft 13 Intermediate shaft gear 14 Cam shaft gear 15 Cam shaft 15a Cam shaft protruding end 16 Cam receiver 17 Positioning pin 18 Needle swing cam 19 Shaft hole 20 Cam groove 21 Positioning hole 22 Set screw 23 Cam engagement pin 24 Cam roller 25 Cam arm 26 Needle swing drive shaft 27 Needle swing drive arm 28 Connection pin 29 Needle swing drive rod 30 Connection pin 31 Sliding shaft drive member 32 Connection pin 33 Connection member 34 Connection pin 35 Adjustment arm 36 Adjustment shaft 37 Partition wall 38 Circumferential wall 39 Cam chamber 40 Cover 41 Packing 42 Work clamp lifting solenoid

Claims (2)

[Claims] 1. A needle swing cam provided on a cam shaft to which rotary motion from a drive shaft is transmitted, and a needle provided to a sliding shaft to which swing motion due to cam engagement with the needle swing cam is transmitted. In a cam exchange type zigzag stitch sewing machine including a rod support, an intermediate shaft that receives the rotational movement from the drive shaft and then transmits the rotational motion to the cam shaft is provided between the drive shaft and the cam shaft. A unique cam replacement type zigzag stitch sewing machine. 2. The drive shaft is a lower shaft, and a worm and a worm wheel for transmitting rotational motion from the lower shaft to the intermediate shaft above are provided, and the needle swing cam is provided on a sewing machine arm standing below the upper shaft. 2. The cam-interchangeable, zigzag stitch sewing machine according to claim 1, wherein the zigzag stitch is a cam-interlacing type sewing machine.