JP2586701Y2 - Intermediate presser device for sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate holding device for a sewing machine.

[0002]

2. Description of the Related Art A sewing machine, such as an embroidery sewing machine, which performs sewing while feeding a cloth in the X and Y directions without using a feed dog, prevents the cloth from rising and fluttering with the needle due to friction with the needle. For this reason, an intermediate presser device is provided which presses the periphery of the needle penetration portion of the cloth downward when the needle is raised. This device normally presses the cloth downward with a middle presser member (hereinafter referred to as a cloth presser member) when the needle rises from the cloth, and after the needle has completely risen from the cloth, the cloth presser member moves up with the needle. It has become.

[0003] However, such an intermediate presser device is effective for sewing a cloth placed and fixed in a flat shape by a cloth support member such as an embroidery sewing machine. When sewing cloth having elasticity, the cloth moves up and down in accordance with the vertical movement of the cloth pressing member, and a seam defect may occur. That is, if the cloth rises with the rise of the presser foot member, the needle thread loop also rises with this, so that the hook point of the shuttle does not catch on the loop, so that a seam is not formed and so-called skipping occurs. Occurs.

[0004] In order to solve such a problem, there has been proposed an intermediate presser device capable of performing sewing even when the cloth presser member is lowered.

FIG. 2 shows a conventional example of such a middle presser device disclosed in Japanese Patent Application Laid-Open No. 63-296783.

In FIG. 1, a sewing machine arm 2 is provided with a needle bar 6 which can be moved up and down in response to the rotation of an upper shaft 4 by a needle bar vertical mechanism (not shown). A needle 8 is provided at the lower end of the needle bar 6.
Is provided.

An eccentric cam 10 is fixed to the upper shaft 4, and when the upper shaft 4 rotates, a connection link 12 connected to the eccentric cam 10 swings. Connection link 12 is fulcrum screw 1
4 and a link fixing nut 16 connected to the swing shaft holder 18. The swing shaft holder 18 is fixed to a swing shaft 20, and a swing arm 22 is fixed to a front end of the swing shaft 20.

The swing motion of the connection link 12 is a swing shaft holding 1
8 and the swinging shaft holder 18 makes a swinging motion as indicated by an arrow A. Therefore, the swing arm 22 also swings as shown by the arrow B, and this movement is transmitted to the link 24 having one end connected to the swing arm 22 to cause the movement as shown by the arrow C. The other end of the link 24 is connected to the end on the fulcrum D side of the L-shaped link 26, the center fulcrum E of the L-shaped link 26 is connected to the link 28, and the fulcrum H at the other end is connected to the link 30. Have been. The link 28 is attached to the sewing machine frame so as to be rotatable about the center fulcrum J. In the illustrated state, the position of the fulcrum E of the L-shaped link 26 is fixed because the abutment portion 28N abuts the stopper pin 31. Then, the L-shaped link 26 makes a vertical arc motion about the fulcrum E as shown by an arrow F. This movement is transmitted to the intermediate presser bar holder 32 via the link 30. Since the intermediate presser bar holder 32 can only move up and down along the guide groove 34 formed on the sewing machine arm, it moves up and down as indicated by the arrow G.

By the above operation, the intermediate presser bar 36 fixed to the intermediate presser bar holder 32 moves up and down in synchronization with the rotation of the upper shaft 4. As a result, the cloth presser member 38 fixed to the intermediate presser bar 36 by the screw 42 is
While the needle 8 is piercing the cloth 40, the cloth 40 is pressed to fix the cloth 40. When the needle 8 is completely lifted from the cloth, the cloth pressing member 38 is also raised.

When sewing is performed with the cloth holding member lowered, the link fixing nut 16 is loosened, and the fulcrum screw 14 is moved to the highest position (downward in FIG. 2) to be fixed. Arrow B of the moving shaft 20 and the swing arm 22
Minimize directional momentum. Next, the swing shaft holder 18 is loosened and the swing shaft 20 is turned counterclockwise. At this time link 2
4. The link 28 rotates clockwise via the L-shaped link 26. At this time, the swing shaft 20 is rotated until the contact portion 28N moves to a position where it cannot contact the stopper pin 31. As a result, the fulcrum E of the L-shaped link 26 becomes movable,
The mold link 26 rotates about the fulcrum H, not the fulcrum E. Therefore, even if the L-shaped link 26 rotates, this rotation is not transmitted to the intermediate presser bar 36, and the vertical momentum of the cloth presser member 38 becomes 0 (zero).

As another conventional example of the intermediate presser device capable of performing sewing even when the cloth presser member is lowered, there is a type disclosed in Japanese Patent Publication No. 63-1875. This device will be described with reference to the device shown in FIG. 2. The right end of the link 24 is removed from the swing arm 22, and the right end can be fixed to the axis R of the swing shaft 20. . Thus, the link 2 to the axis of the swing shaft 20
By connecting 4, the swinging motion of the swinging shaft 20 is not transmitted to the link 24, so that the cloth pressing member 38 does not operate.

[0012]

However, in the case of the intermediate presser device disclosed in Japanese Patent Application Laid-Open No. 63-296783, the operation of the intermediate presser device in a normal manner and the operation of lowering the cloth pressing member 38 are described. At the time of switching when sewing is performed in this state, after loosening the link fixing nut 16 and moving and fixing the fulcrum screw 14, further loosening the swing shaft holding 18 and turning the swing shaft 20 by an appropriate angle, The troublesome adjustment of fixing is necessary. Even when sewing is performed with the cloth presser member 38 lowered, the mechanism for moving the intermediate presser bar 36 up and down moves.
Parts are consumed, and vibration and noise are generated even though 6 does not move up and down.

In the case of the intermediate presser disclosed in Japanese Patent Publication No. 63-1875, the height N of the cloth presser member 38 changes. This will be described with reference to the apparatus shown in FIG. 2. When the right end of the link 24 in FIG. 2 is detached from the swing arm 22 and the right end is fixed to the axis R of the swing shaft 20, the link arrangement becomes two points in FIG. The state changes as shown by the chain line, and the height of the link 30 changes. Therefore, the height N of the cloth presser member 38 connected to the link 30 (see FIG. 2)
See also). When the height N of the presser member 38 changes in this way, it is necessary to adjust the height of the presser member 38 by loosening the screw 42 for fixing the presser member 38 to the intermediate presser bar 36. This adjustment is also necessary when the intermediate presser device is switched to operate in a normal manner.

Therefore, an object of the present invention is to perform a simple operation to switch between the case where the intermediate presser device is operated in a normal manner and the case where sewing is performed with the cloth presser member 38 being lowered. When sewing is performed with the presser foot member 38 lowered, the mechanism for vertically moving the intermediate presser bar 36 is completely stopped, and as a result of this switching, the height N of the presser foot member 38 is reduced. It is an object of the present invention to provide a middle presser device which does not change.

[0015]

According to the present invention, there is provided a presser bar which can be moved up and down, and a needle penetrating portion of the cloth which is supported by the presser bar when the presser bar descends. A middle presser member for pressing the periphery, a swing shaft capable of swinging by rotating the upper shaft of the sewing machine, a swing arm provided on the swing shaft and swinging with the swing shaft, and a swing arm. A rotatable first link having a connectable connecting end at one end and a rotatable fulcrum at the other end, capable of converting the oscillating motion of the oscillating shaft into a vertical motion and transmitting it to the intermediate presser bar; Link means; and a fixed portion formed on a sewing machine arm on a movement trajectory of the connection end about a rotation fulcrum of the first link,
Wherein the linking end of the link is connectable to one of the swing arm and a fixing portion of the sewing machine arm.

[0016]

When the connecting end of the first link is connected to the rocking arm, the rocking motion of the rocking shaft is converted into a vertical motion by the link means and transmitted to the intermediate presser bar. Move up and down in synchronization with rotation. Further, when the connection end of the first link is connected to the fixed portion of the sewing machine arm, the swinging movement of the swing arm is not transmitted to the first link, and the link means is completely stopped.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a perspective view of the intermediate presser of this embodiment. In the figure, a sewing machine arm 2 is provided with a needle bar 6 that can move up and down in synchronization with the rotation of an upper shaft 4 by a needle bar vertical mechanism (not shown). A needle 8 is provided at the lower end of the needle bar 6.

An eccentric cam 10 is fixed to the upper shaft 4, and a connection link 12 is connected to the eccentric cam 10, and the connection link 12 is connected to a swing shaft holder 18 by a fulcrum screw 14 and a link fixing nut 16. I have. The swing shaft holder 18 is fixed to a swing shaft 20, and a swing arm 22 is fixed to a front end (right end in the drawing) of the swing shaft 20.

A link 24 (first link) is connected to the swing arm 22.
Are connected by a step screw 44, and the other end of the link 24 is connected to the upper end of the L-shaped link 26. The right end of the L-shaped link 26 is connected to the upper end of the link 30, and the center (fulcrum E) is connected to the link 28. The link 28 is rotatable about a fulcrum J.

Each of the links 24, 26, 28 and 30 converts the swinging motion of the swinging shaft 20 into a vertical motion to convert the swinging motion of the swinging shaft 20 into a vertical motion.
Link means that can be transmitted to

A female thread (fixed portion) 56 is formed on the trajectory of the sewing machine arm 2 when the right end of the link 24 (the connection end on the side of the step screw 44) moves around the rotation fulcrum D. .

A fulcrum shaft 46 is rotatably mounted on the sewing machine arm 2. A set screw forming the fulcrum J is mounted on the front end of the fulcrum shaft 46, and a helical gear 50 is mounted on the rear end. The helical gear 50 meshes with a helical gear 54 rotatable by a pulse motor 52 fixed to the sewing machine arm 2.
Since the reference numeral 54 and the pulse motor 52 are not related to the gist of the present invention, detailed description thereof will be omitted.

Below the L-shaped link 26, an L-shaped link 2
6, a stopper plate 58 for restricting the downward movement of the fulcrum E is provided fixed to the sewing machine arm 2, and the L-shaped link 26 is provided.
The roller 60 which comes into contact with the stopper plate 58 is
Is provided.

The lower end of the link 30 is connected to a presser bar holder 32 urged downward by a spring 64.
The presser bar holder 32 can only move up and down along a guide groove 34 formed in the sewing machine arm. An intermediate presser bar 36 is fixed to the intermediate presser bar holder 32, and a cloth presser member 38 is fixed to a lower end of the intermediate presser bar 36 by a step screw 42.

When the upper shaft 4 rotates, the connection link 12 connected to the eccentric cam 10 swings. The swinging motion of the connection link 12 is transmitted to the swinging shaft holder 18, and the swinging shaft holder 18 makes a swinging motion as indicated by an arrow A. Therefore, the swing arm 22 also swings as shown by the arrow B. This exercise is link 2
4, the link 24 moves as indicated by the arrow C.

As described above, since the roller 60 which comes into contact with the stopper plate 58 is provided at the fulcrum E of the L-shaped link 26, the vertical position of the fulcrum E of the L-shaped link 26 is determined.
The L-shaped link 26 makes an upward and downward circular motion about the fulcrum E as shown by an arrow F. This movement is link 30
Is transmitted to the intermediate presser bar holder 32 via. The intermediate presser bar holder 32 moves up and down as indicated by an arrow G along the guide groove 34.

With the above operation, the intermediate presser bar 36 is moved to the upper shaft 4
Move up and down in synchronization with the rotation of. As a result, the cloth pressing member 38 presses the periphery of the needle penetrating portion of the cloth 40 at the same time when the needle 8 descends, and presses the cloth 40 into a fixed state while the needle 8 pierces the cloth 40. When the needle 8 is completely lifted from the cloth, the cloth pressing member 38 is also raised.

When sewing is performed with the cloth holding member 38 lowered, the step screw 44 of the link 24 is loosened to release the connection between the link 24 and the swing arm 22, and the link becomes a free end. 24 is fixed to the female thread 56 of the sewing machine arm 2 by the stepped screw 44. As a result, the swing shaft 2
Since the movement transmitted from 0 is cut at the link 24, the link means is completely stopped, and the intermediate presser bar 36 and the cloth presser member 38 are also completely stopped.
Since the intermediate presser bar 36 is urged downward by the spring 64, the intermediate presser bar 36 and the cloth presser member 38 are stopped in a lowered state.

As described above, according to the intermediate presser device of the present embodiment, the case where the sewing machine is operated by the normal method and the case
When sewing is performed while the sewing machine 8 is lowered, it is only necessary to release the connection between the link 24 and the swing arm 22 and fix the link 24 to the threaded portion 56 because the link 24 is formed on the sewing machine arm 2. Therefore, the sewing operation can be performed with a simple operation, and when sewing is performed with the cloth presser member 38 lowered, the link means for vertically moving the intermediate presser bar 36 can be completely stopped. In addition, before and after the switching, the positional relationship and the like of the L-shaped link 26, the link 30, the middle presser bar holder 32 and the like are unchanged, so that the height N of the cloth presser member 38 does not change.

[0031]

[Effect of the invention] According to the intermediate presser device of the present invention,
Switching between normal operation and sewing with the presser foot lowered can be performed with a simple operation, and sewing can be performed with the presser down. In this case, the means for vertically moving the intermediate presser bar is completely stopped, and the height of the cloth presser member does not change as a result of this switching.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a middle presser device according to the present invention.

FIG. 2 is a perspective view of a conventional intermediate presser device.

FIG. 3 is a schematic view showing a part of a link mechanism of a conventional intermediate holding device.

[Explanation of symbols]

 2 Sewing arm 4 Upper shaft 6 Needle bar 8 Needle 18 Oscillating shaft holder 20 Oscillating shaft 24 First link 24, 26, 28, 30 Link means 36 Middle presser bar 38 Fabric presser member 40 Fabric 56 Female thread (fixed) Part)

Claims (1)

(57) [Scope of request for utility model registration] An intermediate presser bar which can be moved up and down, an intermediate presser member which is supported by the intermediate presser bar and presses around the needle penetration portion of the cloth when the intermediate presser bar descends, A swing shaft capable of oscillating movement, a swing arm provided on the swing shaft, swinging together with the swing shaft, a connecting end connectable to the swing arm at one end, and a rotating fulcrum at the other end. A link means capable of converting the swinging motion of the swinging shaft into a vertical motion and transmitting the swinging motion to the intermediate presser bar, and a rotation fulcrum of the first link as a center. A fixing portion formed on the sewing machine arm on the movement trajectory of the connecting end, wherein the connecting end of the first link can be connected to any of the swing arm and the fixing portion of the sewing machine arm. A special holding device for the sewing machine.