JP2004321366A - Needle feeding sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a needle feeding sewing machine by disposing a swinging link member for connecting a horizontal feeding shaft and a needle bar swinging shaft in an unoccupied space in the needle sewing machine. <P>SOLUTION: The needle feeding sewing machine M is provided with: a horizontal feeding shaft 32 associated and connected with a lower shaft 16; a needle bar swinging shaft 42 connected with the horizontal feeding shaft 32 to swing a needle bar table 22 in a cloth feeding direction; and a association mechanism 35 for associating and connecting the horizontal feeding shaft 32 with the needle bar swinging shaft 42. The swinging lever member 43 for the association mechanism 35 connected to the needle bar swinging shaft 42 to swing it in the cloth feeding direction is disposed inside a timing belt 29 stretched between two timing pulleys 27 and 28 supported by an upper shaft 15 and a lower shaft 16 to connect the two timing pulleys 27 and 28. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle feed sewing machine capable of feeding a work cloth by cooperation of a sewing needle and a feed dog.
[0002]
2. Description of the Related Art Generally, when sewing a relatively thick work cloth such as jeans, the sewing needle is synchronized with the feed dog while the work cloth is pierced with the sewing needle in order to reliably prevent the cloth feeding failure of the work cloth. There is known a needle feed sewing machine which is configured to be swung and assisted in cloth feeding by a feed dog.
[0003]
For example, the applicant of the present application has proposed the following needle feed sewing machine (for example, see Patent Document 1). The needle feed sewing machine includes an upper shaft rotatably supported in a sewing machine arm, a needle bar base supported so as to be able to swing back and forth in the cloth feeding direction, and a needle supported vertically movable on the needle bar base. A rod and a lower shaft rotatably supported in the sewing machine bed are provided.A pulley supported on the right end of the upper shaft and a pulley supported on the right end of the lower shaft are connected by a timing belt, and the upper shaft is connected. The rotational driving force of the rotationally driven sewing machine motor is transmitted to the lower shaft via a timing belt.
[0004]
Furthermore, this needle feed sewing machine has a horizontal feed shaft linked to the lower shaft, a feed dog linked to the lower shaft and the horizontal feed shaft, and a needle bar base linked to the horizontal feed shaft in the cloth feed direction. A needle bar swing shaft for swinging is provided, and the horizontal feed shaft and the needle bar swing shaft are linked to each other via a swing lever member and a link member disposed on the left side of the timing belt. At the time of cloth feed by the feed dog, the horizontal feed shaft swings in conjunction with the lower shaft. At this time, the needle bar swing shaft connected to the horizontal feed shaft also swings via the link member. Since the needle bar base swings in the cloth feed direction, the work cloth is fed by the cooperation of the sewing needle and the feed dog.
[0005]
[Patent Document 1] Japanese Patent No. 2682346 (page 3-5, FIG. 1)
[0006]
In the needle feed sewing machine described in Patent Document 1, a swing lever member for interlockingly connecting a horizontal feed shaft and a needle bar swing shaft is disposed on the left side of the timing belt. Therefore, the width of the pillar portion of the sewing machine in the left-right direction is correspondingly increased, and the size of the sewing machine is increased. Further, the space between the sewing needle mounted on the needle bar and the pillar portion is narrowed, so that the flute is narrowed and workability is deteriorated.
[0007]
An object of the present invention is to reduce the size of a needle feed sewing machine by disposing a swing lever member that connects a horizontal feed shaft and a needle bar swing shaft in an empty space within the needle feed sewing machine. For example, the workability is improved by widening the work space.
[0008]
According to a first aspect of the present invention, there is provided a needle feed sewing machine comprising: an upper shaft rotatably supported in a sewing machine arm; a needle bar base supported swingably in a cloth feeding direction; A needle bar supported vertically on a bar base and vertically moved in conjunction with the upper shaft, a lower shaft rotatably supported in a sewing machine bed, a rotating body supported on the upper shaft, and the lower shaft A rotation transmission connecting member that is stretched over a rotating member supported by the shaft and connects the two rotating members, a horizontal feed shaft interlockingly connected to the lower shaft, and the lower shaft and the horizontal feed shaft. A feed dog interlockingly connected to perform four feed motions, a needle bar swing shaft connected to the horizontal feed shaft for swinging the needle bar base in the cloth feeding direction, the horizontal feed shaft and the needle bar swing shaft, A needle feed sewing machine having an interlock mechanism for interlocking the needle bar swing shaft. A swing lever member swingable in a feed direction, and a connection link member for interlockingly connecting the swing lever member and the horizontal feed shaft, wherein the swing lever member includes It is arranged inside.
[0009]
At the time of cloth feeding by the needle feed sewing machine, the horizontal feed shaft swings in conjunction with the lower shaft to which the rotational driving force is transmitted from the upper shaft via the two rotating bodies and the connection body for rotation transmission, and is processed by the feed dog. The cloth is fed in the cloth feed direction. At the same time, the swinging motion of the horizontal feed shaft is transmitted to the swing lever member via the connecting link member, the swing lever member swings in the cloth feeding direction, and the needle bar swing shaft also swings. Since the needle bar swings in the cloth feed direction, the cloth feed by the feed dog is assisted by the sewing needle mounted on the needle bar. Here, the swing lever member is disposed in a space inside the rotation transmitting connecting body, which is an empty space in the needle feed sewing machine.
[0010]
According to a second aspect of the present invention, in the needle feed sewing machine according to the first aspect, the rotation transmitting connecting body is a timing belt. Therefore, the swing lever member is provided inside the timing belt.
[0011]
According to a third aspect of the present invention, in the needle feed sewing machine according to the first or second aspect, the connection link member is located on a sewing head side with respect to the rotation transmitting connection body. Therefore, the connecting link member is connected to the swing lever member from the sewing head side.
[0012]
According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the connecting link member is located on a side opposite to a sewing head with respect to the rotation transmitting connecting body. Therefore, the connecting link member is connected to the swing lever member from the side opposite to the sewing machine head.
[0013]
Embodiments of the present invention will be described. The present embodiment is an example in which the present invention is applied to a lockstitch needle feed sewing machine.
[0014]
As shown in FIG. 1, the lockstitch needle feed sewing machine M includes a sewing machine bed 10, a pillar 11 extending upward from a right end of the sewing machine bed 10, and a sewing machine bed 10 from an upper end of the pillar 11. The sewing machine arm 12 includes a sewing machine arm 12 having a sewing head 13 at the left end extending to the left so as to face each other. An upper shaft 15 extending in the left-right direction is rotatably supported in the sewing machine arm 12 and provided with a needle bar vertical movement mechanism 20 and a balance vertical movement mechanism.
[0015]
The balance vertical movement mechanism has a configuration similar to that of a normal sewing machine, and thus the description thereof is omitted, and the needle bar vertical movement mechanism 20 will be briefly described. First, a needle bar 21 having a sewing needle N attached to its lower end is vertically movably supported by a needle bar base 22 extending in the vertical direction. This needle bar base 22 is fixed to the sewing machine head 13 at its upper end. The support shaft 23 is supported so as to be able to swing back and forth. On the other hand, a hand pulley 37 (see FIGS. 2 and 3) is provided at the right end of the upper shaft 15, and the needle bar crank 24 is fixed to the left end of the upper shaft 15. The upper end is pivotally connected to the lower end of the connecting rod 25 and is connected to the center of the needle bar 21 in the height direction via a needle bar holder 26. Therefore, the needle bar crank 24 is rotated by the rotation of the upper shaft 15, so that the needle bar 21 is vertically reciprocated via the connecting rod 25 and the needle bar clamp 26. Further, on the sewing machine arm 12, a needle bar swing shaft 42 connected to a later-described horizontal feed shaft 32 and swinging the needle bar base 22 in the cloth feeding direction is provided in parallel with the upper shaft 15. A base end of a needle bar swing arm 44 is fixed to the left end of the needle bar swing shaft 42, and a distal end of the needle bar swing arm 44 is It is slidably engaged with the engaging groove 22a oriented in the direction.
[0016]
A lower shaft 16 extending in the left-right direction is rotatably supported in the sewing machine bed 10, and is fixed to the right end of the lower shaft 16 and is a timing pulley (corresponding to a rotating body) 27 that rotates integrally with the lower shaft 16. A timing belt (corresponding to a rotation transmitting connecting body) 29 is stretched over the timing pulley (corresponding to a rotating body) 28 fixed to the right end of the upper shaft 15 and rotating integrally with the upper shaft 15. It is suspended. Therefore, when the upper shaft 15 is driven to rotate by the rotation of a sewing machine motor (not shown), the lower shaft 16 is also driven to rotate via the timing belt 29 at the same time.
[0017]
A disk-shaped eccentric wheel 34 is fixed to the lower shaft 16, and the rear end of the horizontal feed connecting rod 30 is rotatably fitted to the eccentric ring 34, and the front end of the horizontal feed connecting rod 30 has a corner. A piece (not shown) is rotatably mounted, and the square piece is slidably fitted in a groove of a switch (not shown). Note that these square pieces and switches are well known, and description thereof will be omitted. A lower end of a horizontal feed link 31 is also fixed to the square piece, and an upper end of the horizontal feed link 31 is rotatably connected to a horizontal feed arm 33 fixed to a horizontal feed shaft 32 extending in the left-right direction. . Accordingly, the rotation of the lower shaft 16 causes the front end of the horizontal feed connecting rod 30 to swing in the front-rear direction via the eccentric wheel 34, so that the horizontal feed shaft 32 is moved via the horizontal feed link 31 and the horizontal feed arm 33. Rocks. Here, at the left end of the lower shaft 16, a feed dog vertical movement mechanism (not shown) for vertically moving the feed dog is connected, and at the left end of the horizontal feed shaft 32, a feed dog before and after moving the feed dog back and forth. The moving mechanism is connected.
[0018]
Next, an interlocking mechanism 35 that interlocks and connects the horizontal feed shaft 32 and the needle bar swing shaft 42 will be described. As shown in FIGS. 1 to 3, the interlocking mechanism 35 swings the needle bar 21 in the front-rear direction by synchronizing the needle bar 21 with the front-rear movement of the feed dog. The swing lever member 43 is connected and swingable in the cloth feeding direction (front-rear direction), and a connecting link member 39 for linking the swing lever member 43 and the horizontal feed shaft 32 in an interlocking manner.
[0019]
The upper end of the vertically extending swing lever member 43 is fixed to the right end of the needle bar swing shaft 42. Further, a rear end portion of the connection link member 39 is rotatably connected to the lower end portion of the swing lever member 43 from the left side. A needle bar swing crank 36 is fixed to the right end of the horizontal feed shaft 32, and is connected to the right end of the needle bar swing crank 36 at a position eccentric from the axis of the horizontal feed shaft 32 in the front-rear direction. A link member 39 is pivotably supported.
[0020]
Accordingly, when the horizontal feed shaft 32 swings in conjunction with the lower shaft, the connecting link member 39 and the swing lever member 43 connected to a position eccentric from the axis of the horizontal feed shaft 32 swing in synchronization with the swing. Further, the swinging motion of the swinging lever member 43 is transmitted to the needle bar swinging arm 44 via the needle bar swinging shaft 42, and the needle bar base 22 swings and the needle bar 21 swings back and forth. Move.
[0021]
By the way, when the needle bar 21 swings back and forth, the swing angle of the swing lever member 43 is a small angle (for example, about 2 degrees). Therefore, a large space in the front-rear direction is not required for disposing the swing lever member 43 in the pillar 11. Therefore, as shown in FIGS. 1 to 3, in the needle feed sewing machine M, the swing lever member 43 is disposed inside the timing belt 29 stretched over the two timing pulleys 27 and 28. The vacant space in the pillar 11 is effectively used. The swing lever member 43 and the timing belt 29 are always in a relationship separated in the front-rear direction. The connecting link member 39 connected to the swing lever member 43 is located on the left side of the timing belt 29 (on the side of the sewing head 13).
[0022]
The operation and effect of the above-described needle feed sewing machine M will be described.
At the time of cloth feeding, the feed dog interlockingly connected to the lower shaft 16 and the horizontal feed shaft 32 performs four feed motions. At this time, the horizontal feed is synchronized with the swinging motion of the horizontal feed shaft 32 interlocked with the lower shaft 16. The connecting link member 39 and the swing lever member 43 connected at a position eccentric from the axis of the shaft 32 swing. Then, the swing motion of the swing lever member 43 is transmitted to the needle bar swing arm 44 via the needle bar swing shaft 42, the needle bar base 22 swings, and the needle bar 21 swings back and forth. Then, the work cloth is fed in the front-rear direction by the four feed movements of the feed dog and the swing of the sewing needle N back and forth.
[0023]
Here, the swing lever member 43 is disposed inside the timing belt 29 stretched over the two timing pulleys 27 and 28, and the empty space in the pillar 11 is effectively used. Therefore, the left and right widths of the pillar 11 are reduced, and the size of the needle feed sewing machine M can be reduced. In addition, the space between the sewing needle N and the left side surface of the pillar 11 (so-called “float roller”) can be widened, thereby improving workability.
[0024]
By arranging the swing lever member 43 inside the timing belt 29, the width of the pillar 11 in the left-right direction (the direction of the axis of the upper shaft 15 and the lower shaft 16) is reduced. Although the width may be widened, the upper shaft 15 and the lower shaft 16 can be formed by moving the pedestal 11 toward the needle bar 21 without widening the hood and shortening the length of the needle feed sewing machine M in the left-right direction. Of the needle feed sewing machine M can be reduced in size and weight. Further, it is of course possible to slightly widen the hood and slightly shorten the length of the needle feed sewing machine M in the left-right direction.
[0025]
Next, modified embodiments in which various modifications are made to the above-described embodiment will be described. However, components having the same configuration as the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
[0026]
1] As shown in FIG. 4, the connecting link member 39 is connected to the lower end of the swing lever member 43 disposed inside the timing belt 29 from the right side in the pillar 11A, and the connecting link member 39 is It may be located on the right side of the timing belt 29 (on the side opposite to the sewing head 13). Also in this case, since the left and right widths of the pillar 11A are reduced, the size of the needle feed sewing machine M can be reduced. Further, since the space between the sewing needle N on the side of the sewing machine head 13 and the pillar 11A can be made wider than in the above-described embodiment, the hood can be widened and the workability can be further improved.
[0027]
2] The rotation transmission connecting body for transmitting the rotation of the upper shaft 15 to the lower shaft 16 is not limited to the timing belt 29 of the above-described embodiment, but may be a chain or another loop-shaped member. You may.
[0028]
According to the first aspect of the present invention, the swing lever member is disposed in the space inside the rotation transmitting connecting body, and the space in the needle feed sewing machine is effectively utilized to make use of the needle feed sewing machine. The size can be reduced. When the swing lever member is provided in the pillar, the width of the pillar is reduced, and the space between the sewing needle attached to the needle bar and the pillar, that is, the hood is widened. At least one of improving the workability and reducing the size of the entire needle feed sewing machine.
[0029]
According to the second aspect of the present invention, since the swing lever member is disposed inside the timing belt, the size of the needle feed sewing machine can be reduced by effectively utilizing the vacant space inside the timing belt.
[0030]
According to the third aspect of the present invention, since the connection link member is located on the sewing machine head side with respect to the rotation transmission connection body, the connection link member is provided inside the rotation transmission connection body. It can be connected to the member from the sewing head side.
[0031]
According to the fourth aspect of the present invention, since the connecting link member is located on the side opposite to the sewing machine head with respect to the rotation transmitting connecting body, the connecting link member is disposed inside the rotation transmitting connecting body. It can be connected to the moving lever member from the side opposite to the sewing machine head.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an internal mechanism of a needle feed sewing machine according to an embodiment of the present invention.
FIG. 2 is a front view of a main part of an internal mechanism of a pillar.
FIG. 3 is a side view of a main part of an internal mechanism of a pillar.
FIG. 4 is a schematic perspective view of an internal mechanism of a needle feed sewing machine according to a modified embodiment.
[Explanation of symbols]
M Needle feed sewing machine 10 Sewing machine bed 11 Pedestal part 12 Sewing machine arm 13 Sewing machine head 15 Upper shaft 16 Lower shaft 21 Needle bar 22 Needle bar base 27, 28 Timing pulley 29 Timing belt 32 Horizontal feed shaft 35 Interlocking mechanism 39 Connection lever member 42 Needle bar swing shaft 43 swing lever member

Claims (4)

An upper shaft rotatably supported in the sewing machine arm, a needle bar base swingably supported in the cloth feeding direction, and an up-and-down movement supported by the needle bar base to move up and down in conjunction with the upper shaft. And a lower shaft rotatably supported in the sewing machine bed, a rotating body supported by the upper shaft, and a rotating body supported by the lower shaft. A rotation transmitting connecting body for connecting the body, a horizontal feed shaft interlockingly connected to the lower shaft, a feed dog interlockingly connected to the lower shaft and the horizontal feed shaft to perform four feed motions, and connected to the horizontal feed shaft A needle bar swing shaft that swings the needle bar base in the cloth feed direction, and a needle feed sewing machine that includes an interlocking mechanism that interlocks and connects the horizontal feed shaft and the needle bar rock shaft.
The interlocking mechanism is
A swing lever member connected to the needle bar swing shaft and swingable in the cloth feeding direction;
A connecting link member for interlocking the swing lever member and the horizontal feed shaft,
The needle feed sewing machine, wherein the swing lever member is disposed inside the rotation transmitting connection body. The needle feed sewing machine according to claim 1, wherein the rotation transmitting connection body is a timing belt. The needle feed sewing machine according to claim 1, wherein the connection link member is located on a sewing machine head side with respect to the rotation transmitting connection body. The needle feed sewing machine according to claim 1, wherein the connection link member is located on a side opposite to a sewing head with respect to the rotation transmitting connection body.

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