JPS62281992A - Roller feed mechanism of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a roller feed mechanism of a sewing machine, and particularly to a reverse stitch mechanism in a roller feed type sewing machine.

[Conventional technology]

When performing reverse stitching (back stitching) or stop stitching during sewing work on a sewing machine, if the sewing machine has a back mechanism, each time the presser foot is raised and the workpiece is
It is necessary to reverse the pattern 1800 times and sew it, which is a cumbersome operation. For this reason, many sewing machines having a normal so-called "4y1 movement" type vertical feed mechanism are provided with a back mechanism.

Furthermore, even among sewing machines with a roller feed mechanism that is convenient for sewing relatively hard, thick materials or workpieces with steps, those with a back mechanism do not use the normal "4-motion" feed mechanism for lower feed. Among the sewing machines equipped with a roller feed mechanism, there was no conventional sewing machine with a bank function.

[Problem that the invention seeks to solve]

However, even the roller-feed type sewing machines, which are desirable for the above-mentioned special sewing items, adopt a normal "4-movement" feeding mechanism for the bottom feed in order to have a picking function. The vertical movement of the downward feed directly affects the workpiece, causing the entire workpiece to oscillate up and down, resulting in the loss of the long-awaited advantage of roller feeding.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sewing machine having a roller feed function with a back function for reverse stitching.

[Means for solving problems]

Therefore, in the present invention, in order to drive the lower feed roller, the rotation is transmitted to the center shaft and outer shaft, which are coaxially arranged, through the swing shaft that transmits the swing motion from the bottom shaft of the sewing machine. A pair of one-way clutches set in opposite directions and a one-stage two-stage planetary gear mechanism are used to extract the rotation of the idler gear support member and drive the lower feed roller,
In addition, when reverse stitching is performed, the lower feed roller is driven in forward and reverse directions by switching a clutch means disposed on the swing shaft, thereby achieving the above object.

[For production]

With the configuration described above, reverse stitching can be performed using a roller feed type sewing machine.

〔Example〕

The present invention will be explained below based on examples.

FIGS. 1 and 2 show perspective views of the lower roller and upper roller feeding mechanisms, respectively, according to the present invention.

3 is a front view of a sewing machine equipped with this feed mechanism, FIG. 4 is a lower plan view (IV-rV arrow view), and FIG.
6 are left and right side views (V-V and rV-rV arrow views), respectively, of the frame shown in FIG. 3, cut away.

(Configuration) In Figures 3 to 6, the end of the intermediate shaft 1 is connected to the drive heald (
A sprocket wheel 3 is fixed to the intermediate shaft 1, and a sprocket wheel 6 is fixed to the upper shaft (main shaft) 5.
They are connected by a toothed belt 7. Also, intermediate shaft 1
Another sprocket wheel 4 fixedly attached to the lower shaft 8 and a sprocket wheel 9 fixedly attached to one end of the lower shaft 8 are connected by a toothed belt 10.

In FIG. 1 showing the lower roller feeding mechanism, an eccentric cam 11 is fixed to the lower shaft 8, and a feed rod 12 is rotatably connected to the eccentric cam 11.
The other end of 2 is connected to a bowl 14 fixed to the swing shaft 13. An arm 15 is fixed to the swing shaft 13, and an arm 15 is connected to one end of the center shaft 16 via a first one-way clutch (one-way clutch or freewheel) 17 that transmits rotation only in one direction. 18 are attached, and the arms 15 and 18 are connected to each other by a link 19. Further, an arm 20 fixed to one end of the swing shaft 13 and an arm 22 fixed to one end of the clutch shaft 21 are connected by a link 23.

As shown in Fig. 7 (Ca), a partial cross-section taken in the direction ■-■ in Fig. , Ji temporary 24 is fixed, and
The clutch shaft 25 has a clutch plate 25a having wave-shaped teeth similar to those of the clutch plate 24 on the circumferential portions of both sides at a position opposite to the clutch shaft 21 on the same axis. The clutch plate 27 is pressed against a clutch plate 27 having a circumferential portion on one side thereof. Then, the clutch plate 24 and the clutch shafts 21, 25 . The compression coil spring 26 constitutes a clutch means for basting operation. This clutch plate 27 is fixed to the machine frame F of the sewing machine. In addition,
Figure 7 (b) is a clutch operation diagram (described later) in Figure 7 (a).
It is.

An arm 28 (Fig. 1.7) is fixed to the other end of the clutch shaft 25, and a link receiver 29 is attached to the arm 28 so that the arm length can be adjusted. Further, one end of a lever 31 rotatably attached to a shaft 30 fixed to the machine frame F is in contact with an end surface of the clutch shaft 25. Also, machine frame F
An arm 33 rotatably attached to a shaft 32 fixed to
(FIG. 1) and one end of the lever 31 are connected to the loft 3.
Connected by 4. Furthermore, the shaft 3 fixed to the machine frame
One end of an arm 36 rotatably attached to the arm 5 and one end of the arm 33 are connected by a rod 37. A cam follower roller 37 is attached to the other end of the arm 36, and a cam 39 is fixed to one end of the lever shaft 38 of the back lever 40.
is in contact with.

FIG. 8 is a cross-sectional view taken along the UX-■X arrow in FIG.
Figures 10 and 11 are DC- in Figure 8, respectively.
1X arrow view, XX arrow view, and -°C arrow view.

In Figure 1.11, the outer shaft 4 is concentrically placed on the center shaft 16.
1 is rotatably mounted, and a second one-way clutch 42 transmits rotation only in one direction to one end of the outer shaft 41.
An arm 43 is attached to the link receiver 29 attached to the arm 28, and both ends of the arm 43 and the link receiver 29 attached to the arm 28 are connected by a loft 44 of a ball bearing.

Further, at the other end of the center shaft 16, a single stage planetary gear set (No. 1.8.
The sun gear 16b shown in FIG.
Three planetary gears 45 meshing with each other are rotatably supported on respective shafts 46a protruding from a support plate (carrier member) 46 at equal intervals.

The strike plate 46 has a first gear having a gear wheel (FIG. 1) at the other end.
It is fixed to the step gear shaft 47. In addition, the second stage gear shaft 4
A spur gear 50 and a helical gear 51 are fixed to the shaft 9, and the spur gears 48 and 50 mesh with each other.Furthermore, a third stage gear 52 is eccentrically provided perpendicular to the shaft 49. A meshing helical gear 53 is attached to the other end, and a helical gear bevel gear 52a is attached to the other end, which meshes with a helical ring bevel gear 55a rotatably attached to the lower roller shaft 54. The ring bevel gear is configured to drive a lower feed roller 55 that is integrated with the ring bevel gear.

Further, the first and second one-way clutches 17 and 42 (Figs. 8, 9, and 10) are assembled so as to transmit rotation toward the lower end.

In FIG. 1, an arm 56 is fixed to the right end of the swing shaft 13, and an arm 58 and an arm 56 are fixed to one end of the upper swing shaft 57 (FIGS. 1 and 2). are connected by a link 59.

FIG. 2 is a perspective view showing the drive mechanism of the upper feed roller 75, FIG. Showing the operating diagram (described later),
An outer shaft 61 is rotatably mounted concentrically on the center shaft 60, and an arm 63 is mounted to one end of the outer shaft 61 via a third one-way clutch 62 that transmits rotation in only one direction. It is being Further, an arm 65 is attached to the middle of the outer shaft 61 via a similar fourth one-way clutch 64.

An arm 66 is fixed to the other end of the upper t3 moving shaft 57, a link receiver 67 is attached to the arm 66 with a screw so that the arm length can be adjusted, and the arm 63 and the link receiver 67 have ball bearings at both ends. They are connected by a link 68. Further, the arm 63 is connected to the upper swing shaft 5 by a link 69 with ball bearings at both ends.
7 is connected to the center of the end face.

Further, the lower end of the outer shaft 61 is provided with a clutch plate 61a having wave-shaped teeth formed on the circumference, and is pressed via a compression coil spring 71 against a clutch plate 70 having mating wave-shaped teeth fixed to the center shaft 60. There is. The center shaft 60 and the connecting lower door 2 and the connecting shafts 72 and 73 are connected by spherical joints, respectively. A helical bevel gear binion 73a is provided at one end of the shaft 73, and meshes with a helical bevel gear 75a attached to the side surface of the lower feed tallow rough 5, which is rotatably attached to the upper feed roller shaft 74. The upper roller 75 is driven.

On the other hand, a base 77 is fixed to the lower end of the presser bar 76, and a lip 78a protruding from a holder 78 that fixes the upper feed roller shaft 74 is fixed to the base 77. Also,
A presser foot holder 79 is fixed in the middle of the presser foot 76, and a coil spring 81 interposed between this presser foot foam 79 and an adjustment screw 80 of the moxibustion section causes the presser rod 26 to move downward. is biased towards Further, an L-shaped arm 82 is pivotally attached to the one-shaped end of the presser bar holder 79, and an L-shaped arm 82 is rotatably attached.
One end of the clutch plate 2 is formed into a bifurcated shape and abuts against the clutch plate 61a at the lower end of the outer shaft 61.

Further, one end of an arm 83 rotatably attached to a shaft 89 fixed to the machine frame F and one end of the L-shaped arm 82 are connected by a rod 84. One end of an arm 86 rotatably attached to the machine frame F fixed shaft 85 and the other end of the arm 82 are connected by a rod 87, and a roller 8B is attached to the other end of the arm 86.
is pivotally mounted, and functions as a cam follower by coming into contact with a cam 39 fixed to one end of the lever shaft 38 for the back lever 40.

(Regular sewing operation) Next, the regular sewing operation in the above configuration will be explained. First, regarding the movement of the lower feed roller 55, in FIG. 1, an eccentric cam 11 fixed to the lower shaft 8 causes the swing shaft to swing between the front and rear directions in the figure through the feed rod 12 due to the rotation of the lower shaft 8. An arm 15 fixed on a moving wetting shaft 13
swings the arm 18 via the link 19.

In FIG. 9, the first one-way clutch 17 is assembled so that the rotation transmission direction is clockwise rotation, and the arm 18
Only the clockwise rotational component (arrow A) of the rocking motion rotates the center shaft 16, and the counterclockwise rotational component (arrow B) overruns and idles, and the center shaft 16 is stopped. Therefore, the center shaft 16 performs an intermittent movement of clockwise rotation. In addition, in FIG. 11, the outer shaft 4
The arm 43 attached to the clutch shaft 25 via the second one-way clutch 42 is connected by a rod 44 to a link receiver 29 attached to the arm 28 fixed to the clutch shaft 25. In Fig. 7a), the clutch plate 27 is engaged with the clutch plate 27 fixed to the main body, and the clutch shaft 25 is stationary. Further, the second one-way clutch 42 attached to the outer shaft 41 (FIG. 8) is installed so that the rotation transmission direction is on the left, contrary to the first one-way clutch 17, so that the inner shaft 16 The single-stage planetary gear Wj formed at one end of , the lateral sun gear 16a (FIG. 10) rotates clockwise (arrow c) L, and the internal gear 41a formed at one end of the outer shaft 41 remains stationary.

Now, the ratio of the number of teeth Z of the sun gear 16a to the number of teeth 22 of the internal gear 41a is Zl /Z! = 1/2, the planetary gear 45 similarly rotates clockwise (arrow D) L, and its rotational speed is 1/(1+2)=1/3 of the speed of the sun gear 16a.
Rotate with. The support plate 46 of the planetary gear 45 rotates clockwise,
In FIG. 1, gears 48, 50, 51, 53, 52a
, 55a, and the lower feed roller 55 is rotated intermittently so that it remains stationary while the sewing machine needle is penetrating the workpiece, so that there is no problem.

Next, the operation of the upper feed roller 75 will be explained. The rocking motion of the rocking shaft 13 in FIG. 1 is also transmitted to the upper rocking shaft 57, and in FIG. The arm 63 is swung through the . The one-way clutch 62 is
It is assembled so that the direction of rotation transmission is clockwise rotation, and the arm 6
Only the right rotational component (arrow E in FIG. 12a) of the uniform rocking motion of No. 3 rotates the center shaft 60, and the left rotation component (arrow F) overruns and idles, and the center shaft 60 remains stationary. An arm 65 via a fourth one-wake rack 64, which is separately incorporated in the outer shaft 61, is attached to a rod 69 at the center of the end surface of the upper swing shaft 57.
The fourth one-wake clutch 64, which is connected to the other third wake clutch 62 and remains stationary without transmitting the rocking motion of the upper rocking shaft 57, is similar to the other third wake clutch 62.
It is built to transmit only the clockwise rotation direction, and when the other one-way clutch overruns (arrow F), the outer shaft 6
1 acts as a stopper to prevent it from reversing.

A clutch plate 61a formed at one end of the outer shaft 61 and a clutch plate 70 fixed to the inner shaft 60 mesh with each other, so that the inner shaft 60
Rotate the connecting shaft 72. Rotation is transmitted to the shaft 73, and the upper feed roller 75 is intermittently rotated in synchronization with the lower feed roller 55.

(Reverse stitching operation) Next, the operation when performing bank stitching will be explained. In FIG. 1, when the back lever 40 is pushed down in the direction of arrow G, the protrusion 39a of the temporary cam 39 pushes down the roller 37, and the loft 37 is pulled up. By the action of the lever, the arm 33 and the lever 31 are moved respectively, and in Fig. 7,
Lever 3! Press the clutch shaft 25 in the direction of the clutch shaft 21. The clutch shaft 21 is the swing shaft 13 (Fig. 1)
When the clutch plate 24 and the clutch plate 25a engage with each other, the clutch shaft 25 also starts to swing, and as shown in FIG. 41's arm 43. The second one-way clutch 42 is incorporated so as to transmit only left rotation, and only the left rotation component (arrow H) of the arm 43 rotates the outer shaft 41, while the right rotation component (arrow I) overruns and idles. However, the outer shaft 41 is stationary.

Therefore, in FIG. 8 and FIG. 13 showing the operating state during reverse stitching in FIG.
It rotates clockwise (arrow C) regardless of the movement of the outer shaft 41.
The internal gear 41a formed at one end rotates counterclockwise (arrow J)
are doing.

As mentioned above, since the ratio of the number of teeth Zl of the sun gear 16a to the number of teeth 22 of the internal gear 41a is 1:2, the planetary gear 45 rotates to the left (arrow K) L, and its rotational speed is It rotates at 1/3 of the sun gear 16a. The support plate 46 that pivotally supports the planetary gear 45 rotates to the left, and the gears 48, 50, 51
．． 53. 53a and 55a are sequentially driven to intermittently rotate the lower feed roller 55 in the opposite direction and at the same speed as during forward rotation.

On the other hand, regarding the upper feed roller 75, in FIG.
When the back lever 40 is pushed down (arrow G), the protrusion 39b of the temporary cam 39 pushes up the roller 88 and pulls down the loft 87. By lever action, the arm 83 and the L-shaped arm 82 are moved, and one end of the L-shaped arm 82 pushes up the clutch plate 61a formed on one end of the outer shaft 61, as shown in FIG. By separating the plate 61a and the clutch plate 70, the center shaft 60 becomes in a neutral state, and the upper feed roller 75 rotates in the opposite direction while the lower feed roller 55 rotates in the opposite direction.
Only the elastic force component is biased downward by the compression spring 81 of the presser bar 76, and the rotation is free and rotates following the backward movement of the workpiece.

As described above, when the back lever 40 is operated, the lower feed roller 55 drives the workpiece in the opposite direction, and the upper feed roller 75 follows this, so that the workpiece is wrapped in a bank.

At this time, when the push rod 76 is raised by a knee-lifting lever (not shown) or the like, the holder 78 and the L-shaped arm 82 move up and down together with the presser bar 76, and the rod 84 connected to the L-shaped arm 82 moves up and down. , moves in an arc shape around one end of the arm 83, and since the rod 64 is sufficiently long, the movement of the L-shaped arm 82 does not pose any problem.

In addition, in FIG. 1.8, the center shaft 16 and the outer shaft 41 swing in opposite directions with respect to the swing motion of the swing shaft 13,
In addition, since the rotation transmission direction with the first/second one-way clutch 17/42 is set to be opposite to each other, no matter when the back lever 40 is operated,
The intermittent rotation phase of the lower feed roller 55 does not shift,
A normal feed phase can be maintained.

Furthermore, in FIGS. 1 and 8, an arm 91 is fixed to the center shaft 16 by a ring 92 via a fifth one-way clutch 90 that transmits only clockwise rotation, and a ninth
As shown in the figure, the first one-way clutch 17 is
The function is to prevent the center shaft 16 from rotating in the opposite direction when overrunning in the direction.

Although the above embodiment shows a case in which the upper feed roller 75 is driven from the lower shaft 8 of the sewing machine, the principles of the present invention can be applied even if the upper feed roller is driven in the normal direction by a pulse motor or the like. It is possible.

Effects of E-stitching As explained above based on the embodiments, according to the present invention, it is possible to realize a burr mechanism that did not previously exist in a roller-feed type sewing machine, so that reverse stitching is possible. There is no need to turn the workpiece each time, improving productivity.

[Brief explanation of drawings]

1 to 13 all relate to one embodiment of the present invention, FIGS. 1 and 2 are perspective views of the lower and upper roller feeding mechanisms, respectively, and FIGS. 3 and 4 are A front view of a sewing machine equipped with this feed mechanism and its rV-rV
The arrow view, FIG. 5, and FIG. 6 are respectively V- in FIG. 3.
■ and VT-Vl arrow view, Figure 7 a, b are from Figure 1 ■
- Each operating state diagram in the arrow view, Fig. 8, is the U- of Fig. 1.
11X arrow view, FIG. 9, FIG. 10, and FIG. 11 are the Δ-m,
FIGS. 12a and 12b are operation state diagrams showing a front view of the main part of the upper feed roller drive barrel, and FIG. 13 is an operation state S diagram during reverse stitching in FIG. 10. 8--111 lower shaft, 13--)3 moving shaft, 16--center shaft 16a--sun gear 17/42-
---First/second one-way clutch 21.25--
- Cradle, J shaft 40 - Bank lever 41a - Internal gear 45 - Planetary gear 46 - Support plate 55 - Lower feed reroller? FI--Upper feed roller Application Tokyo Heavy Equipment Industry Co., Ltd. 6O-806-P2/9 Figure 2 Figure 4 6O-806-P /g 6O-606-P '4 Figure 5 Figure 6 Figure 7 Figure 6O-806-P 6/1J (a) Figure 12 (a) 6O-806-Pa, @chain

Claims (1)

[Claims] Via the oscillating shaft that transmits oscillating motion from the lower shaft of the sewing machine,
An outer shaft is disposed coaxially rotatably on a center shaft connected to the first one-way clutch, and the outer shaft sets a rotation transmission direction with respect to the first one-way clutch. The swing shaft is connected to a clutch means for reverse stitching operation through a second one-way clutch, and a sun gear and an internal gear of a single-stage planetary gear mechanism are connected to one end of each of the center shaft and the outer shaft, respectively. The lower feed roller is configured to be driven by the rotation of the planetary gear support member of the planetary gear mechanism, and the lower feed roller is configured to be rotated in forward and reverse directions by switching the reverse stitching operation clutch means. A roller feed mechanism of a sewing machine characterized by: