JPS62392A - Apparatus for feeding article to be sewn in 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 [Field of Industrial Application] The present invention relates to a material feeding device for a sewing machine, in which a material to be sewn is held and fed between a circular rotating body and a sliding plate.

[Conventional technology]

2. Description of the Related Art As a type of material feeding device for a sewing machine, one is known in which the material is placed on a sliding plate and is fed by pressing the peripheral surface of a circular rotating body and rotating the material.

FIG. 3 is a perspective view of a conventional sewing material feeding device of this type disclosed in German Patent No. 1175951. An arm 2 is fixed to a swing shaft 1 which is rotatably supported with restricted movement, and a swing mechanism (not shown) moves the swing shaft 1 in forward and reverse directions by a predetermined angle. The arm 2 is configured to swing by rotating back and forth.

On the other hand, an upper wheel shaft 5 is rotatably and slidably supported on upper and lower bearings 3 and 4 fixed to the sewing machine main body, and a bushing 6 screwed to the upper wheel shaft 5 is , a lever 8 is fitted via a one-way clutch 7. The free end of this lever 8 and the free end of the arm 2 are connected by a connecting lever 10 having spherical bearings 9 at both end connecting parts.
When the arm 2 swings, the sillper 8 swings, and the action of the one-way clutch 7 causes the upper wheel shaft 5 to rotate intermittently in one direction. On the other hand, a presser foot shaft 12 is inserted into a bearing 11 fixed to the sewing machine main body so that it can be raised and lowered. A frame guide 13 having a square hole is fixed to the lower end of the presser shaft 12. Reference numeral 14 denotes a frame that connects the upper wheel shaft 5 and the presser shaft 12, and the lower end of the upper wheel shaft 5 is rotatably supported in the shaft hole while being restricted from moving in the axial direction. Moreover, rotation is restricted by inserting one end of the square column part into the square hole of the frame guide 13 so as to be able to move up and down slightly. The frame 14 has an upper wheel 15 as a disc-shaped circular rotating body with a gear 1Sa provided on the end face.
The gear 15m, which is pivotally connected via the pivot shaft 16, meshes with a pinion 1T that is pivotally connected to the upper wheel shaft 5.

Due to this structure, when sewing, when the presser foot shaft 12 is released from the raised position, the presser foot shaft 12 is lowered by the bias of the spring member, and the frame guide 13 The upper wheel axle 5 connected to the frame 14 via the upper wheel shaft 5 also slides down within the inner holes of the bearings 3 and 4. At this time, the two arms are stationary and only the connecting lever 10 swings as the lever 8 is lowered, but the provision of the spherical bearing 9 absorbs the twisting. As the upper wheel shaft 5 descends, the circumferential surface of the upper wheel 15 is pressed against the article to be sewn (hereinafter referred to as cloth) placed on the sliding plate 18.

Then, when sewing is performed by moving the sewing machine needle up and down using a sewing machine needle up and down device (not shown), the swing shaft 1 reciprocates at the same period in conjunction with this up and down movement, and the arm 2 swings and connects. Since the lever 8 swings via the lever 10, the upper wheel shaft 5 is intermittently rotated in one direction by the action of the one-way clutch 7 at the same period as the vertical movement of the sewing machine needle. Therefore, the upper wheel 15 rotates intermittently due to the engagement between the pinion 17 and the gear 1Sa;
At this time, the spring pressure that lowers the presser shaft 12 acts on the upper wheel 15 to generate a frictional force between the upper wheel 15 and the cloth, so that cloth speeding is performed.

When sewing is finished, when the presser foot shaft 12 is raised against the spring pressure, the square hole of the frame guide 13 and the frame 14
After the gap between the frame 14 and the prismatic portion disappears, the frame 14 rises, and the upper wheel axle 5 also rises while swinging the connecting lever 10. The presser shaft 12 is locked by the lifting locking mechanism, and the upper wheel 15 releases the cloth from the grip.

[Problem that the invention seeks to solve]

However, in the conventional sewing material feeding device configured as described above, when the arm 2 swings during sewing work, the swing is transmitted to the upper wheel shaft 5 via the connecting lever 10 and the lever 8.
The force acts in the axial direction at the same period as the oscillation, and the fluctuation of this force is transmitted to the upper wheel 15 and received by the lowering spring pressure of the presser shaft 12. The pressing force of the wheel 15 becomes unstable and good sewing performance cannot be obtained), but the pressing force applied to the cloth by the upper wheel 15 is large, so it can follow sudden changes in the thickness of the cloth during sewing. However, there was a problem in that the upper wheel 15 and the cloth became separated, resulting in poor cloth feeding. Furthermore, in order to reduce the influence of the swinging of the connecting lever 10 and to ensure the vertical motion of the upper wheel 15, the connecting lever 10 must be made longer.
There was a problem that the device could not be configured compactly.

The present invention has been made to solve the above-mentioned problems, and has an object to prevent periodic force generated in the axial direction of the upper wheel shaft from being transmitted to the upper wheel, and to reduce cloth presser spring pressure. One object of the present invention is to provide a sewing machine workpiece feeding device for improving sewing performance by making it possible to improve sewing performance.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a system in which pinion shafts to which pinions are fixed, which mesh with the circular rotating body for holding down the workpiece, are slidably rotated relative to each other. One of the shafts is rotatably supported on the sewing machine main body side while restricting movement in the axial direction, and the pinion is attached to the other shaft. between the shaft and the sewing machine body.
An elastic body is provided to bias this shaft and the presser foot shaft for operating the shaft in the direction in which the circular rotating body presses the object to be sewn.

[Effect]

With this configuration, when the presser shaft is lowered, one of the pinion shafts connected to the presser shaft by the connecting member is lowered by the elastic force of the elastic body while the other shaft remains stationary. ,
The circular rotating body presses the object to be sewn. When you start sewing, the pinion shaft moves in two directions, interlocking with the vertical movement of the sewing machine needle.
The shaft integrally rotates intermittently, and the circular rotary body rotates intermittently due to the engagement between the pinion and the circular rotary body to feed the workpiece. In this case, one of the pinion shafts is restricted from moving in the axial direction, and since this shaft and the other shaft are separate bodies in the axial direction, the pinion shaft is connected to the pinion shaft by a link. Even when the moving shaft rotates back and forth, no vertical force acts on the circular rotating body.

〔Example〕

1 and 2 show an embodiment of an initial feeding device for sewing a sewing machine according to the present invention, FIG. 1 is a perspective view thereof, and FIG. 2 is a sectional view of the same main part. In these figures, the third
Components with the same reference numerals as those in the figures have the same configurations, so a detailed explanation thereof will be omitted and will be briefly described below. A swing shaft 1 that reciprocates in conjunction with the vertical movement of the sewing machine needle includes an arm 2 forming a link and a connecting lever 10. Lever 8 has a spherical bearing 9
One end of the link is connected with the other end and a pinion shaft 20, which will be described below, is interposed with a one-way latch T. On the other hand, bearing 1 on the sewing machine body side
The presser shaft 12 inserted into the presser shaft 1 so as to be freely raised and lowered is not urged downward by a spring member as shown in FIG. 1, but is merely locked by a locking mechanism in the raised position. Further, a frame guide 13A formed in a U-shape different from that shown in FIG. 1 is fixed to the lower end of the presser shaft 12, and this frame guide 13AK is different from the one shown in FIG. A prismatic portion of the frame 14A, which is formed in the same shape as the frame 14A, is engaged. 15 is the pivot 1 on the frame 14A.
The upper wheel is a circular rotating body that is pivotally connected at 6 and has a gear tSa on the end face.

Therefore, the configuration of the pinion shaft, etc. will be explained. pinion shaft 20
has a two-shaft structure consisting of a hollow outer tube 21 and a spline shaft 22 that engages with a spline groove 21 formed in its inner hole, and the outer tube 21 and spline shaft 22 rotate relative to each other. It is fitted so that it can slide freely. The outer tube 21 is a bearing portion 23m of the sewing machine main body, which is indicated by the reference numeral 23 in FIG.

23b is rotatably supported by K, and the outer tube 21
Movement in the axial direction is regulated by upper and lower collars 24, 25 fixed to. The lever 8 of the link is fitted into the outer tube 21 via a one-way latch T. On the other hand, the shaft hole of the frame 14A is rotatably fitted into the spline 22 so that movement in the axial direction is restricted, and the pinion 17 that meshes with the gear 151 is attached to the downwardly projecting end of the spline 22. It is attached to the shaft. And the spline shaft 22
A spring shaft 26 is slidably inserted into a shaft hole 22m drilled from the upper end face at the shaft center of the sewing machine, and is moved upward by an adjusting screw 27 screwed into a threaded hole on the sewing machine body 23 side. is regulated, and the head of the spring shaft 26 and the spline shaft 2
A spline shaft 2 is connected to the outer tube 21 between the end face of the spline shaft 2 and
A compression coil spring 28 is interposed to bias 2 downward. The spring pressure of this compression coil spring 28 is determined by the adjusting screw 27.
The upper wheel 15 is configured to be pressed against the cloth on the sliding plate 18 by the adjusted spring pressure.

The operation of the sewing material initial feed device configured as described above will be explained. When sewing, when the presser foot shaft 12, which is locked in the raised position, is released and lowered, the frame 1
4A is released from support by frame guide 13A, so frames 14A, ! The spline shaft 22 is lowered by the elastic force of the compression coil spring 28, and the upper wheel 15
The peripheral surface of is pressed against the cloth on the sliding plate 1B. In this case, the pinion shaft 20 only moves down the spline shaft 22, and the outer tube 21 remains stationary with its movement in the axial direction being restricted by the collars 24, 25.

Then, when sewing is performed by moving the sewing machine needle up and down using a sewing machine needle up-and-down device (not shown), the swing shaft 1 reciprocates at the same period in conjunction with this up-and-down movement, and the arm 2 swings to move the connecting lever. Since the lever 8 swings via the lever 10, the outer tube 21 of the sewing pinion shaft 20 is intermittently rotated in one direction by the action of the one-way clutch 7 at the same period as the vertical movement of the sewing machine needle. When the outer tube 21 rotates, the spline shaft 22 integrated with the outer tube 21 also rotates intermittently in the rotation direction, and the engagement between the pinion 17 and the gear 15m causes υ
The upper wheel 15 rotates intermittently, but at this time, the upper wheel 15 is pressed against the cloth and a frictional force is generated between the upper wheel 15 and the cloth, so that intermittent cloth speeding is performed at the same period as the vertical movement of the sewing machine needle. . During sewing, even if the arm 2 swings and swings the lever 8, the outer tube 21 that supports the lever 8 is restricted from moving in the axial direction, so that the lever 8 remains at the same height. However, no vertical force acts on the spline shaft 22, the upper wheel 15 of the frame 14A1, etc., and the upper wheel 15
The set spring pressure of the compression coil spring 28 is always applied.

When sewing is finished, when the presser foot shaft 12 is raised, the frame guide 13A comes into contact with the prism section of the frame 14A, and then the frame 14A moves along with the presser foot shaft 12 while compressing the compression coil spring 28. The upper wheel 1
5 is separated from the cloth, the presser foot shaft 12 is locked by the locking mechanism at the upper limit position.

In this embodiment, an example is shown in which the pinion shaft 20 having a two-shaft structure is formed by an outer tube 21 and a spline shaft 22 that engage with each other through splines. Any structure may be used as long as it is freely and non-rotatably fitted. Furthermore, in this embodiment, the outer tube 21, which is the outer shaft of the two-shaft pinion shaft 20, is supported on the sewing machine main body 23 side, and the spline shaft 22, which is the inner shaft, is coupled to the frame 14A side. However, this may be reversed so that the inner shaft is supported on the sewing machine main body 23 side and the outer shaft is connected to the frame 14A side. moreover,
The elastic body that generates the presser force is not limited to the compression coil spring 28, but may be any other elastic body as long as it generates the presser force, and it can be attached to any part of the frame 14A or the shaft connected thereto. It can be anywhere. Further, in the above embodiment, the upper wheel 15 is used as a circular rotating body and a transport device is attached thereto, but it may also be an alight transport device, which has the same effect as the above embodiment. .

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the initial feed device for sewing the sewing machine, the pinion shaft to which the pinion that meshes with the circular rotating body for holding the sewing material is fixed is fixed. It is formed of two internal and external shafts that are mutually slidable and non-rotatable, one of which is rotatably supported by the sewing machine main body while restricting axial movement, and the pinion is mounted on the other shaft. At the same time, an elastic body is provided between the other shaft and the sewing machine body to bias this shaft and the presser foot shaft for operating the sewing machine in the direction in which the circular rotating body presses the object to be sewn. During sewing, even if the pinion shaft and the swing shaft connected by a link rotate back and forth and a vertical component of force is applied to the pinion shaft, this force is applied to one shaft supported by the sewing machine body. Only,
Since this shaft does not act on the other shaft, which is separate in the axial direction, the pressing force of the circular rotating body on the sewing object is always stable.
Good feed is obtained and sewing performance is improved. In addition, since the pinion shaft is directly biased by the elastic body, the pressing force on the workpiece can be weakened and can be freely adjusted, so that the Even if the thickness changes rapidly, it can be easily followed, and the fabric feeding is extremely stable for various types of sewing objects.

[Brief explanation of drawings]

1 and 2 show an embodiment of the initial feed device for sewing a sewing machine according to the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a sectional view of the main part, and FIG. 3 is a conventional FIG. 3 is a perspective view of the sewing material initial feed device of the sewing machine in FIG. 1... Swing shaft, 2... Arm, T... One-way clutch, 8... Lever, 9, Q... - Spherical bearing, 10
...Connection lever, 12...Presser shaft, 13A...
...Frame guide, 14 people...Frame, 15.
---Stopping %, 15m...Gear, 16...Pivot, 17...Pinion, 18...Sliding plate, 20...
...-pinion shaft, 21Φ...outer tube, 22...e spline shaft, 23...sewing machine body, 23&, 2
3b...-Bearing part, 24, 25...Color, 2
7...adjustment screw, 28...compression coil spring.

Claims (1)

[Claims] The reciprocating rotation of the swing shaft linked to the vertical movement of the sewing machine needle is transmitted to the pinion shaft as intermittent rotation in one direction via the link,
The rotation of the pinion on the pinion shaft is transmitted to the circular rotating body that meshes with the pinion shaft, and the pinion shaft is lowered by lowering the presser shaft connected to the pinion shaft by a connecting member. In a workpiece feeding device of a sewing machine in which a circular rotary body is pressed against a workpiece, the pinion shaft has two internal and external parts that are slidable and non-rotatable.
One of the shafts is rotatably supported on the sewing machine main body side while restricting its axial movement, and the pinion is attached to the other shaft, and the other shaft and the sewing machine are connected to each other. 1. A workpiece feeding device for a sewing machine, characterized in that an elastic body is interposed between the workpiece feeder and the main body side for biasing the shaft and the presser foot shaft in a direction in which the circular rotating body presses the workpiece.