WO2023195123A1

WO2023195123A1 - Feed-off-the-arm sewing machine

Info

Publication number: WO2023195123A1
Application number: PCT/JP2022/017247
Authority: WO
Inventors: 智紀村上; 弘山浦; 良平高橋; 凱末富
Original assignee: 株式会社森本製作所
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2023-10-12
Also published as: CN117203386A; JP7126305B1; JPWO2023195123A1

Abstract

Provided is a feed-off-the-arm sewing machine in which the number of members and the number of connecting members are reduced so the feed-off-the-arm sewing machine is reduced in size and has rattling problems reduced.　The feed-off-the-arm sewing machine includes: a needle that reciprocates in synchronization with the rotation of a sewing machine spindle; a looper that forms a seam by capturing a needle thread loop in synchronization with the needle; a feed table having feed teeth at a front end; a needle holding table installed in parallel with the feed table and having a needle holder protecting the needle at a front end; and a needle holding table lever connected to the needle holding table at the front side, having an eccentric hole at the rear side, and connected to the sewing machine spindle via an eccentric, wherein long holes are formed in the feed table and the needle holding table, a fixing pin is fixed to a frame of the sewing machine through the long holes and square pieces installed in the long holes, the rear end of the needle holding table and the rear end of the feed table are connected and interlocked by the pin and square piece, and the eccentric moves the needle holding table elliptically and moves the feed table up and down by the pin and square piece at the rear end of the needle holding table and the rear end of the feed table.

Description

Feeding arm type sewing machine

The present invention relates to a sewing machine, and specifically relates to a feed-out arm type sewing machine.

Conventionally, various feed stands and needle rest drive mechanisms are known for feed arm type sewing machines. For example, in the sewing machine disclosed in Patent Document 1, a feed stand and a needle holder are arranged side by side. A needle receiver is attached to the needle receiver and a feed dog is attached to the feeder.

The first eccentric and lever mechanism realize vertical movement of the feed base and needle cradle, and the second eccentric and lever mechanism realize back and forth movement of the needle cradle.

Japanese Patent Application Publication No. 2005-58700

In Patent Document 1, the vertical movement of the feed base and the needle cradle is realized by the first eccentric, and the back and forth movement of the needle cradle is realized by the second eccentric. In other words, the elliptical movement (up-and-back movement) of the needle rest (needle rest) is realized by two eccentrics. For this reason, in Patent Document 1, since the number of parts is relatively large, the sewing machine becomes large and it is difficult to reduce the size of the sewing machine.

Further, in Patent Document 1, since the number of members is relatively large, the number of connecting members is also relatively large. Connections between each member are made, for example, by a plurality of pins, screws, or the like. For this reason, looseness is likely to occur. Backlash may affect the needle guard, leading to problems such as skipped stitches, thread breakage, poor sewing, and deterioration of sewing quality.

Therefore, an object of the present invention has been made in view of such technical problems, and is to provide a feed-out arm type sewing machine that can reduce the number of parts and connection members, be smaller in size, and reduce the problem of backlash. It is in the point of providing.

In order to achieve the above object, the first aspect (first invention) of the present application is as follows:
It is a feed-out arm type sewing machine,
A needle that reciprocates in conjunction with the rotation of the main shaft of the sewing machine, which is perpendicular to the sewing direction,
a looper that captures a needle thread loop to form a stitch in synchronization with the reciprocating movement of the needle;
A feed base with a feed dog attached to the front end,
a needle holder installed in parallel with the feed pedestal and having a needle holder attached to the front end to protect the needle;
A needle holder lever is connected to the needle holder on the front side, has an eccentric hole installed in the rear side, and is connected to the sewing machine main shaft via the eccentric installed in the eccentric hole,
A long hole is formed in the feed table and the needle holder, and a fixing pin passes through the long hole and a square piece installed in the long hole and is fixed to the frame of the sewing machine,
The rear end of the needle holder and the rear end of the feed base are connected to each other by a pin and a square piece, so that they interlock,
The eccentric is characterized in that it moves the needle cradle in an elliptical motion, and moves the feed bar up and down by a pin and a square piece provided at the rear end of the needle cradle and the rear end of the feed bar.

In the sewing machine of the first embodiment, only a single eccentric is used to move the needle cradle in an elliptical motion and to move the feed bar up and down. Thereby, the number of members and the number of connecting members can be reduced, and the device can be made smaller. Furthermore, since the number of connecting members is small, the occurrence of backlash can be reduced, and the device can operate accurately for a long time without failure.

A second aspect (second invention) of the present application is that in the first aspect, when the needle is at the top dead center, when the feed dog is at the top dead center, and when the looper has finished catching the needle thread loop, Parameters of the feed-out arm type sewing machine are set so that the needle receiver is at the rear dead center.

In a third aspect (third invention) of the present application, in the second aspect, the parameters include an eccentric amount of the eccentric, a position of the fixing pin, a position of the sewing machine main shaft, and an attachment of the needle holder lever on the needle holder. the position of the feed dog on the feed stand, and the position of the needle holder on the needle holder.
According to the second and third aspects described above, the movements of the needle, feed dog, looper, and needle receiver are well-coordinated, and an ideal movement can be formed.

In a fourth aspect (fourth invention) of the present application, in the first to third aspects, when the feed-out arm type sewing machine operates, the sewing machine main shaft is connected to the needle holder and the feed-out arm during at least part of the time. Located directly below the table.
The sewing machine of the fourth aspect can further reduce the size of the device in the front and back direction, and is useful for further downsizing the device.

In a fifth aspect (fifth invention) of the present application, in the first to third aspects, the needle holder lever is integrally formed with the needle holder.
In the sewing machine of the fifth aspect, since the needle holder lever is formed integrally with the needle holder, there is no need for a fastening member between the needle holder lever and the needle holder, and the number of members and connecting members are reduced. further decrease.

In a sixth aspect (sixth invention) of the present application, in the first to third aspects, the front end of the feed bar is shorter than the front end of the needle holder, and the feed dog is connected to the front surface of the front end of the feed bar by a fastening member. connected to.
In the sewing machine of the sixth aspect, the feed dog can be appropriately located at the front end of the feed table, and is installed to appropriately straddle the feed table and the needle holder.

In a seventh aspect (seventh invention) of the present application, in the first to third aspects, the number of the feed tables is one or more.
The present application may be applied to single feed sewing machines or to differential feed sewing machines.

According to the present invention, by using only a single eccentric, it is possible to realize elliptical movement (vertical and back-and-forth movement) of the needle guard, and also to realize vertical movement of the feed table using the eccentric.
Furthermore, by setting the parameters of the sewing machine, ideal motion coordination among the needle, feed dog, needle guard, and looper can be realized.
Further, since the number of members and the number of connecting members are reduced, the device can be downsized and the probability of rattling of the members can be reduced.

1 is a perspective view of a feed-out arm type sewing machine according to an embodiment of the present invention. It is a schematic diagram of the front end of a feed stand and a needle cradle. It is a schematic diagram of a needle and a looper. FIG. 3 is a perspective view of the feed and needle receiver combination. FIG. 3 is an exploded view of the feed and needle receiver combination.

FIG. 1 is a perspective view of a feed-out arm type sewing machine 1 according to an embodiment of the present application. The sewing machine 1 includes a frame 11, an arm 12, and a feed/needle receiver combination section 13. The feed and needle receiver combination 13 is housed in the frame 11 .

As shown in the figure, X, Y, and Z indicate directions in three-dimensional space. In this embodiment, the X direction is referred to as the front-back direction, the Z direction is referred to as the up-down direction, and the Y direction is referred to as the left-right direction. Note that the +X direction is referred to as the front, and the -X direction is referred to as the rear. Naturally, this is illustrative only and not limiting.

In the arm 12 of the sewing machine 1 of the present application, the needle 14 reciprocates up and down (in the Z direction) in conjunction with the rotation of the main shaft of the sewing machine. The feed dog conveys the cloth in the +X direction. That is, the +X direction is the sewing direction. The sewing machine main shaft is provided to extend in the Y direction. That is, the main axis of the sewing machine is perpendicular to the sewing direction. The movement of the feed dog and the needle receiver is realized by the movement of the feed dog and the needle receiver in the X direction and the Z direction. The specific configuration will be explained in detail later.

FIG. 2 is a schematic diagram of the front end of the feed base 21 and needle holder 22. As shown in FIG. 2, the feed stand 21 and the needle receiver stand 22 are arranged in parallel. A feed dog 23 is attached to the front end of the feed base 21. The front end of the feed dog 23 in the +X direction is formed to protrude further in the +X direction than the front end of the needle holder 22 in the +X direction.

The width of the feed dog 23 in the Y direction is approximately the sum of the widths of the feed table 21 and the needle receiver 22 in the Y direction. When viewed along the +Y direction, the feed dog 23 is formed into a bridge shape, with a space formed below. A needle receiver 24 is attached to the front end of the needle receiver 22. The needle receiver 24 protrudes from the needle receiver 22 in the +Z direction and is located in a space below the feed dog 23.

FIG. 3 is a schematic diagram of the needle 14 and the looper 25. As shown in FIG. 3, there may be a plurality of needles 14, for example three. Of course, this is exemplary and other numbers of needles 14 are possible. The looper 25 is attached to a looper drive shaft 26. The looper drive shaft 26 is installed parallel to the needle holder 22 and is interlocked with the rotation of the main shaft of the sewing machine. As a result, the looper 25 captures the needle thread loop in synchronization with the up-and-down reciprocation of the needle 14 to form a stitch.

FIG. 4 is a perspective view of the feed and needle receiver combination section 13. As shown in FIG. 4, the feed stand 21 and the needle receiver stand 22 are arranged in parallel.

Elongated holes

21a and 22a are formed in the intermediate portions of the feeding table 21 and the needle receiving table 22, respectively. A fixing pin and a square piece are provided in the

long holes

21a and 22a. The front side of the needle holder lever 3 is connected to the needle holder.

In the figure, the needle cradle lever 3 is connected to the needle cradle by a fastening member such as a bolt. Further, the needle rest lever 3 may be formed integrally with the needle rest. This further reduces the number of connecting members and further reduces the possibility of backlash.

As shown at A in the figure, an eccentric hole 31 is formed on the rear side of the needle holder lever 3. As shown at B in the figure, an eccentric 32 is installed in the eccentric hole 31. The eccentric amount of the eccentric 32 is e. The needle holder lever 3 is connected to the sewing machine main shaft 4 by the eccentric 32. As shown in the figure, the main shaft 4 of the sewing machine is perpendicular to the sewing direction +X. When the main shaft 4 of the sewing machine rotates, the eccentric 32 causes the needle holder lever 3 to transmit vertical and longitudinal movements to the needle holder 22.

FIG. 5 is an exploded view of the feed and needle receiver combination section 13. As shown in FIG. 5, the front end of the feed base 21 is shorter than the front end of the needle holder 22. The feed dog 23 is fastened to the front surface of the front end of the feed base 21 with a fastening member such as a bolt. The needle receiver 24 is attached to the needle receiver stand 22 with a fastening member such as a bolt.

The fixing pin 27 and the

square pieces

28a, 28b are inserted into the

long holes

22a, 21a. The fixing pin 27 is fixed to the frame 11 of the sewing machine 1. With this structure, the fixing pin 27 serves as a fulcrum for the vertical movement of the needle holder 22. A bifurcated portion 21b with an open rear end is formed at the rear end of the feed base 21, and a pin hole portion 22b is formed at the rear end of the needle receiver 22.

The square piece 29 is provided within the bifurcated portion 21b via a pin 30 inserted into the pin hole portion 22b. Therefore, since the square piece 29 is not fixed to the feed base 21, it can be displaced back and forth within the bifurcated portion 21b. With this structure, the vertical movement of the needle cradle 22 is transmitted to the feed pedestal 21, but the longitudinal movement of the needle cradle 22 is not transmitted to the feed pedestal 21.

As shown in FIG. 5, the needle receiver lever 3 is connected to the sewing machine main shaft 4 by an eccentric 32 located within the eccentric hole 31. The lever 6 is also connected to the sewing machine main shaft 4 via an eccentric. The other end of the lever 6 is connected to a swinging member 62 via a pin 61. The swing shaft 5 passes through the center hole of the swing member 62. Moreover, the swing shaft 5 passes through the center hole of the swing member 63. As shown in FIG. 4, the swinging

members

62 and 63 are installed at a certain interval. The front end of the lever 7 is connected to the feed base 21 via a fastening member. The rear end of the lever 7 is connected to the swing member 63 via a fastening member.

With the above structure, when the sewing machine main shaft 4 rotates, the needle holder 22 moves back and forth and up and down by the eccentric 32. At the same time, the vertical movement of the needle holder 22 is also transmitted to the feed table 21 by the pin 30 and the square piece 29, so that the feed table 21 also moves up and down. Further, by transmitting the rotational motion of the sewing machine main shaft 4 to the feed table 21 in the order of the lever 6, the swing member 62, the swing shaft 5, the swing member 63, and the lever 7, the feed table 21 moves back and forth.

Therefore, the single needle cradle lever 3 and eccentric 32 realize the longitudinal and vertical movement of the needle cradle 22 (i.e., elliptical movement) and the vertical movement of the feed bar 21. In the sewing machine 1 according to the embodiment of the present application, the amount and timing of the elliptical movement of the needle guard 24 and the amount and timing of the vertical movement of the feed dog 23 are influenced by a plurality of factors.

For example, the factors that affect the momentum and movement timing of the elliptical movement of the needle receiver 24 are the mounting position of the needle receiver 24 on the needle receiver 22, the mounting position of the fixing pin 27, and the needle receiver 22 of the needle receiver lever 3. The mounting position of the eccentric 32, the eccentric amount of the eccentric 32, the position of the sewing machine main shaft 4, etc. can be included.

For example, the factors that affect the amount and timing of vertical movement of the feed dog 23 are the mounting position of the feed dog 23 on the feed base 21, the mounting position of the fixing pin 27, and the position of the needle rest lever 3 on the needle rest 22. It can include the mounting position, the amount of eccentricity of the eccentric 32, the position of the sewing machine main shaft 4, etc. Furthermore, if the feed dog is at the top dead center when the needle 14 is at the top dead center, and the needle guard is at the rear dead center when the looper finishes catching the needle thread loop, then the sewing machine 1 is ideal. You can perform various exercises.

Therefore, when the needle 14 is at the top dead center, the feed dog is at the top dead center, and when the looper has finished capturing the needle thread loop, the needle guard 24 is moved in an elliptical manner so that the needle guard is at the back dead center. The above parameters that affect the vertical movement of the feed dog 23 must be calculated at the manufacturing stage or adjusted during use.

When other parameters such as the mounting position of the feed dog 23 on the feed base 21, the mounting position of the fixing pin 27, the mounting position of the needle holder lever 3 on the needle holder 22, and the position of the sewing machine main shaft 4 are predetermined, In order to satisfy that the feed dog is at the top dead center when the needle 14 is at the top dead center, the eccentric amount e1 of the eccentric 32 is calculated and obtained. In addition, other parameters such as the mounting position of the needle holder 24 on the needle holder 22, the mounting position of the fixing pin 27, the mounting position of the needle holder lever 3 on the needle holder 22, and the position of the sewing machine main shaft 4 are predetermined. In some cases, the eccentric amount e2 of the eccentric 32 is calculated and obtained in order to satisfy that the needle receiver is at the dead center when the looper finishes capturing the needle thread loop.

If e1 and e2 can be made equal, it is theoretically possible to simultaneously realize the elliptical movement of the needle cradle and the vertical movement of the feed table using a single eccentric. Naturally, when the needle 14 is at the top dead center, the feed dog is at the top dead center, and when the looper finishes capturing the needle thread loop, the needle guard can be at the back dead center. Alternatively, other parameters may be changed during the use stage.

When the sewing machine 1 of this embodiment operates, as shown in FIG. 4, the sewing machine main shaft 4 is located directly below the needle rest and feed base for at least part of the time. With this structure, the structure of the sewing machine 1 can be made compact, which is advantageous for downsizing.

Furthermore, the number of feed tables shown in this embodiment is one. The present application is not limited to this embodiment, and may include, for example, a plurality of feed tables. In the case of multiple carriages, for example the carriages can be moved differentially. This application also presents exemplary embodiments. Those skilled in the art can make various modifications after reading this disclosure. The scope of this application is limited only by the claims.

1 Sewing machine 3 Needle rest lever 4 Sewing machine main shaft 5 Swing shaft 6, 7 Lever 11 Frame 12 Arm 13 Feeding and needle rest combination part 14 Needle 21 Feeding rest 21a Long hole 21b Bifurcated part 22 Needle rest 22a Long hole 22b Pin hole Part 23 Feed dog 24 Needle receiver 25 Looper 26 Looper drive shaft 27

Fixed pin

28a, 28b, 29 Square piece 30 Pin 31 Eccentric hole 32 Eccentric 61

62, 63 Swing member

Claims

It is a feed-out arm type sewing machine,
A needle that reciprocates in conjunction with the rotation of the main shaft of the sewing machine, which is perpendicular to the sewing direction,
a looper that captures a needle thread loop to form a stitch in synchronization with the reciprocating movement of the needle;
A feed base with a feed dog attached to the front end,
a needle holder installed in parallel with the feed pedestal and having a needle holder attached to the front end to protect the needle;
A needle holder lever is connected to the needle holder on the front side, has an eccentric hole installed in the rear side, and is connected to the sewing machine main shaft via the eccentric installed in the eccentric hole,
A long hole is formed in the feed table and the needle holder, and a fixing pin passes through the long hole and a square piece installed in the long hole and is fixed to the frame of the sewing machine,
The rear end of the needle holder and the rear end of the feed base are connected to each other by a pin and a square piece, so that they interlock,
The eccentric is a feed-out arm type sewing machine in which the needle cradle is moved in an elliptical motion, and the feed pedestal is moved up and down by a pin and a square piece provided at the rear end of the needle cradle and the rear end of the feed base.
The feed arm shape is configured such that when the needle is at the top dead center, the feed dog is at the top dead center, and when the looper has finished capturing the needle thread loop, the needle guard is at the back dead center. The feed-out arm type sewing machine according to claim 1, wherein parameters of the sewing machine are set.
The parameters include the eccentric amount of the eccentric, the position of the fixing pin, the position of the sewing machine main shaft, the attachment position of the needle holder lever on the needle holder, the attachment position of the feed dog on the feed stand, and the needle holder. 3. The feed-out arm type sewing machine according to claim 2, including at least one mounting position of the needle receiver.
The feeding arm according to any one of claims 1 to 3, wherein when the feeding arm type sewing machine operates, the main shaft of the sewing machine is located directly below the needle holder and the feeding table for at least part of the time. pattern sewing machine.
The feed-out arm type sewing machine according to any one of claims 1 to 3, wherein the needle holder lever is integrally formed with the needle holder.
The front end of the feed base is shorter than the front end of the needle holder;
The feed arm type sewing machine according to any one of claims 1 to 3, wherein the feed dog is connected to the front surface of the front end of the feed table by a fastening member.
The feed arm type sewing machine according to any one of claims 1 to 3, wherein the feed table is one or more.