JP2003326005A - Needle feed sewing machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify a configuration for switching between a needle feed state and a downward feed state. SOLUTION: When a link member 39 is connected at a position of a swing screw hole 36a by a stepped screw 40, a swing of a horizontal feed shaft 32 swings a needle bar swing crank 36, so that the link member 39 is driven. Then, the needle bar base swings, and the link member 39 is fixed by the step screw 40 to the fixing screw hole 32a.
Is connected at the position, the one end of the link member 39 is held at a predetermined position despite the swing of the horizontal feed shaft 32 and the swing of the needle bar swing crank 36. Is held in a predetermined fixed position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle feed sewing machine for feeding a work cloth by cooperation of a sewing needle and a feed dog.

[0002]

2. Description of the Related Art Generally, for example, in order to reliably prevent a defective feeding of a work cloth when sewing a relatively thick work cloth such as jeans, the work needle is stabbed with a sewing needle and the sewing needle is used as a feed dog. There is known a needle feed sewing machine configured to oscillate in synchronism with the above and assist the cloth feed by the feed dog. The needle feed sewing machine is provided with a switching device for switching between a needle feed state in which the work cloth is fed by cooperation of the sewing needle and the feed dog, and a lower feed state in which the work cloth is fed by only the feed tooth. Therefore, the switching device is switched according to the thickness of the work cloth so that the stitches can be surely formed for each of the set feed pitches for both thick and thin work cloths.

As the switching device, for example, Japanese Patent Laid-Open No.
According to Japanese Patent Laid-Open No. 1-104383, in a needle feed state, a rocking body attached to one end of a rocking shaft is connected to a rocking rod for driving a needle swinging mechanism. In the lower feed state, the rocking body and the rocking rod are disconnected from each other, and the link fixing plate attached to the machine frame is connected to the rocking rod. Further, the stop position of the needle in the front-rear direction can be adjusted by adjusting the attachment position of the link fixing plate.

[0004]

However, in the conventional needle feed sewing machine, there is a problem that a separate member, which is a link fixing plate, must be newly prepared.

Further, since the mounting position of the link fixing plate is adjustable, conversely, the connecting position of the needle swing mechanism and the swing rod is determined in order to adjust the swing position (swing range) of the needle. There is a problem that there is no standard.

Further, it is necessary to dispose the link fixing plate so that the connecting position of the swing rod and the link fixing plate comes on the locus of the rotation of the swing rod about the connecting shaft, and other members. There is a problem that can be an obstacle.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a needle feed sewing machine capable of simplifying the structure for switching between the needle feed state and the lower feed state. .

Another object of the present invention is to provide a needle feed sewing machine having a reference for determining the connecting position of the needle swing mechanism and the swing rod for adjusting the swing position (swing range) of the needle.

Another object of the present invention is to provide a needle feed sewing machine in which the position where one end of the link mechanism is fixed does not interfere with other members.

[0010]

In order to achieve the above object, a needle feed sewing machine according to a first aspect of the present invention has a needle bar that moves up and down and is supported so as to be swingable in the cloth feed direction. When,
A rotation shaft that rotates to swing the needle bar base, a swinging member that is attached to the rotation shaft and that swings in accordance with the rotation of the rotation shaft, and a needle bar base that is connected to the needle bar base. In a needle feed swinging machine for swinging the needle bar in the cloth feeding direction, and a link mechanism for interlockingly connecting the needle bar swinging shaft and one end of the swinging member. A screw member that is connected to a swing screw hole provided at one end of the swing member through a through hole provided in the swing member, and a screw member provided at the rotation center of the rotation shaft and provided at one end of the link mechanism. And a fixing screw hole for connecting the screw member through the provided through hole.

According to this structure, since the fixing screw hole is simply formed at the center of rotation of the rotating shaft, the structure for switching between the needle feeding state and the lower feeding state can be simplified.

A needle feed sewing machine according to a second aspect of the present invention is
A needle bar base having a vertically movable needle bar and swingably supported in the cloth feed direction; a rotary shaft that rotates to rock the needle bar base; and a rotary shaft attached to the rotary shaft. A swing member that swings in accordance with the rotation of the rotary shaft, a needle bar swing shaft that is connected to the needle bar base and swings the needle bar base in the cloth feed direction, and the needle bar swing shaft and the swing member. A needle feed sewing machine provided with a link mechanism for interlockingly connecting the one end of the swing mechanism and the one end of the link mechanism, and It is characterized in that it is provided with an engaging member which is provided at a rotation center position and which is connected to one end of the link mechanism separated from one end of the swing member by the attaching / detaching means.

According to this structure, one end of the link mechanism is connected to the engaging member at the rotation center position of the rotation shaft, so it is necessary to prepare another place for fixing one end of the link mechanism. Therefore, it does not interfere with other members.

A needle feed sewing machine according to a third aspect of the present invention is
The needle feed sewing machine according to claim 1 or 2 is characterized by comprising an adjusting portion capable of adjusting a connecting position between the other end portion of the link mechanism and the needle bar swing shaft.

According to this structure, the fixed position of the needle bar can be easily adjusted by adjusting the connecting position.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a lockstitch needle feed sewing machine. As shown in FIG. 1, the electronically controlled lockstitch needle feed sewing machine M includes a sewing machine bed 10, a pedestal portion 11 extending upward from a right end portion of the sewing machine bed 10, and a sewing machine from an upper end portion of the pedestal portion 11. Sewing arm 1 extending leftward so as to face the bed 10
It consists of 2. And, in the sewing machine arm 12,
An upper shaft 15 extending in the left-right direction is rotatably supported by the machine frame 5, and a needle bar vertical movement mechanism 20 and a balance vertical movement mechanism are provided.

Since this balance up / down moving mechanism is similar to a normal sewing machine, its explanation is omitted, and the needle bar up / down moving mechanism 20 will be briefly described. The needle bar 21 having a sewing needle (not shown) attached to its lower end is The needle bar base 22 is vertically movably supported by a vertically extending needle bar base 22.
It is supported by a support shaft 23 fixed to the machine frame 5 so that it can swing back and forth. On the other hand, a needle bar crank 24 is fixed to the left end of the upper shaft 15, and the connecting rod 2 is attached to the needle bar crank 24.
The upper end of 5 is rotatably pivotally attached, and the lower end of the connecting rod 25 is connected to the center of the needle bar 21 in the height direction via a needle bar holder 26. Therefore, since the needle bar crank 24 is rotated by the rotation of the upper shaft 15, the needle bar 21 is vertically reciprocated via the connecting rod 25 and the needle bar holder 26.

A lower shaft 16 extending in the left-right direction is rotatably supported by the machine frame 5 on the sewing machine bed 10.
Timing pulley 27 and the upper shaft 15 connected to the right end of the
A timing belt 29 is stretched over a timing pulley 28 fixed to the right end of the. Therefore, the upper shaft 15 is rotationally driven by the rotational driving of the sewing machine motor (not shown), and at the same time, the lower shaft 16 is rotationally driven through the timing belt 29.

A disc-shaped eccentric ring 34 is fixed to the lower shaft 16, and a rear end portion of a horizontal feed connecting rod 30 is rotatably fitted to the eccentric ring 34 so that the front end of the horizontal feed connecting rod 30 is attached. The portion is fixed to the lower end of the horizontal feed link 31, and the upper end of the horizontal feed link 31 is fixed to a horizontal feed shaft (corresponding to the rotating shaft of the invention) 32 extending in the left-right direction.
Is rotatably connected to. Therefore, the rotation of the lower shaft 16 causes the front end portion of the horizontal feed connecting rod 30 to swing in the front-rear direction along the feed adjuster (not shown) via the eccentric wheel 34. The horizontal feed shaft 32 swings via 33. Here, at the left end of the lower shaft 16, a feed dog up-and-down moving mechanism for vertically moving the feed dog, not shown, is connected. The moving mechanism is connected.

Next, the connecting mechanism 35 for swinging the needle bar 21 in the front-back direction in synchronization with the front-back movement of the feed dog will be described. The right end portion of the horizontal feed shaft 32 has a front surface substantially L
A character-shaped needle bar swinging crank (corresponding to the swinging member of the present invention) 36 is fixed, and one end of a link member 39 extending in the front-rear direction serves as a screw member at one end of the needle bar swinging crank 36. It is rotatably supported by a step screw 40.

Here, as shown in FIG. 2, the step screw 40 comprises a threaded portion 40a and a stepped portion 40b, and is inserted through a through hole 39a formed at one end of the link member 39 to insert a needle bar. The swing crank 36 can be screwed into a swing screw hole 36a formed at one end of the swing crank 36.

Further, a fixing screw hole 32a into which a step screw 40 can be screwed is formed at the center of rotation of the horizontal feed shaft 32. Then, the step screw 40 can be screwed into the fixing screw hole 32 a of the horizontal feed shaft 32 by inserting the step screw 40 into the through hole 39 a formed at one end of the link member 39. By positioning one end of the link member 39 at the position of the fixing screw hole 32a, the link member 39 is not driven even if the needle bar swing crank 36 swings.

Therefore, the stepped screw 40 and the fixing screw hole 32a in this embodiment correspond to the attaching / detaching means and the engaging member of claim 2 of the present invention.

On the other hand, at the right end of the needle bar rocking shaft 42 arranged in parallel with the upper shaft 15, a needle bar rocking connecting rod extending in the vertical direction (a link mechanism of the present invention is constructed together with a link member. ) 43 is fixedly attached, and the lower end of the needle bar swinging connecting rod 43 is rotatably connected to the rear end of the link member 39. Further, the base end portion of the needle bar swing arm 44 is fixed to the left end portion of the needle bar swing shaft 42, and the tip end portion of the needle bar swing arm 44 is formed at the lower end portion of the needle bar base 22. It is slidably engaged with the engagement groove 22a extending in the vertical direction. Therefore, when the link member 39 is connected by the step screw 40 at the position of the swinging screw hole 36a shown in FIG.
Since the needle bar swinging crank 36 swings by the swinging of the needle bar, the link member 39 is driven, and the needle bar swinging arm 44 simultaneously moves through the needle bar swinging connecting rod 43 and the needle bar swinging shaft 42. As the needle bar base 22 swings, the needle bar 21 reciprocates back and forth.

However, the link member 3 is fixed by the step screw 40.
When 9 is connected at the position of the fixing screw hole 32a shown in FIG. 2, one end of the link member 39 has a predetermined length despite the swing of the horizontal feed shaft 32 and the swing of the needle bar swing crank 36. Since the needle bar base 22 is held at the predetermined position, the needle bar base 22 is held at the predetermined fixed position, and as a result, the needle bar 21 is vertically driven at the predetermined fixed position without swinging back and forth.

Next, a method of adjusting the fixed position of the needle bar base 22 will be described. The fixed position of the needle bar base 22 is preferably such that the sewing needle is in the vertical direction, and basically, it is hardly adjusted after the sewing machine is adjusted and determined at the time of shipment.

First, as shown by the solid line in FIG. 3, a step screw 40 is formed in the through hole 39 formed at one end of the link member 39.
The screw for fixing the other end portion (corresponding to the other end portion of the link mechanism of the present invention) of the needle bar swinging connecting rod 43 in a state where it is inserted through a and screwed into the fixing screw hole 32a of the horizontal feed shaft 32. Loosen 43a (corresponding to the adjusting portion of the present invention). Then, the needle bar swing shaft 42 and the needle bar base 22 become free,
The operator adjusts the needle bar 21 and the like back and forth so that the sewing needle is oriented in the vertical direction. In this state, the tightening screw 43a is tightened to fix the needle bar swing shaft 42 and the needle bar swing connecting rod 43.

In this way, once the connecting position between the needle bar swing shaft 42 and the needle bar swing connecting rod 43 is adjusted and fixed, the downward feed from the needle feed state shown by the two-dot chain line in FIG. Even if the needle bar base 22 is changed to the state, the fixed position of the needle bar base 22 does not change. As described above, since the fixing screw hole 32a is used as a reference for adjusting the connecting position of the needle bar swing shaft 42 and the needle bar swing connecting rod 43, the needle bar swing shaft 42 and the needle bar swinging link 42a. The connection position with the rod 43 can be easily adjusted.

Next, a modification of the embodiment will be described.

In this embodiment, the horizontal feed shaft 32
Although the fixing screw hole 32a is formed in the needle bar swinging crank 36, if the needle bar swinging crank 36 covers the end face of the horizontal feed shaft 32, the needle bar swinging crank 36 is formed with the fixing screw hole. Good. In this case, the horizontal feed shaft 32 is formed at a position corresponding to the rotation center position.

Further, instead of the fixing screw hole 32a and the swinging screw hole 36a, a screw pin is erected on each of the horizontal feed shaft 32 and the needle bar swinging crank 36, and instead of the step screw 40, a link is provided by a nut or the like. The members 39 may be connected to each other.

The type of sewing machine can also be applied to various needle feed sewing machines such as a one-needle lockstitch sewing machine, a two-needle lockstitch sewing machine, and a bead sewing machine.

[0033]

As described above in detail, in the needle feed sewing machine according to the first aspect, since the fixing screw hole is only opened at the rotation center of the rotation shaft, the needle feed state and the lower feed state are switched. The configuration of can be simplified.

Further, the needle feed sewing machine according to claim 2 is
An attaching / detaching means for detachably connecting the one end of the swinging member and the one end of the link mechanism and a pivoting center position of the rotating shaft, and the detaching means detached from the one end of the swinging member. Since one end of the link mechanism is connected to the engagement member at the rotation center position of the rotation shaft, the one end of the link mechanism is fixed. It is not necessary to prepare another place for doing so, so that it does not interfere with other members.

A needle feed sewing machine according to a third aspect of the present invention is
The needle feed sewing machine according to claim 1 or 2, further comprising an adjusting portion that can adjust a connecting position between the other end of the link mechanism and the needle bar swinging shaft, so that the needle bar can be adjusted by adjusting the connecting position. The fixed position of can be easily adjusted.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an internal mechanism of an electronically controlled lockstitch needle feed sewing machine.

FIG. 2 is an exploded perspective view showing a connecting portion between a needle bar swinging crank and a link member of FIG.

FIG. 3 is a side view of a main part of an internal mechanism of the sewing machine.

[Explanation of symbols]

21 needle bar 22 needle bar stand 32 horizontal feed axis 32a fixing screw hole 36 needle bar swing crank 36a Swing screw hole 39 Link member 40-step screw 42 needle bar swing axis 43 Needle bar swinging rod 43a Tightening screw

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyasu Iwakoshi             Brother, 15-1, Naeshiro-cho, Mizuho-ku, Nagoya             Industry Co., Ltd. (72) Inventor Tomoharu Mizutani             Brother, 15-1, Naeshiro-cho, Mizuho-ku, Nagoya             Industry Co., Ltd. F term (reference) 3B150 AA01 BA01 BA03 CB26 CE02                       CE03 CE05 CE23 CE25 DB04                       DB08 DE01 DE06 DE14 JA02                       JA20 JA28 JA29 JA33

Claims (3)

[Claims] 1. A needle bar base having a vertically movable needle bar and swingably supported in the cloth feed direction, a rotary shaft that rotates to rock the needle bar base, and its rotation. A swing member attached to the shaft and swinging according to the rotation of the rotation shaft, a needle bar swing shaft that is connected to the needle bar base and swings the needle bar base in the cloth feed direction, and the needle bar swing In a needle feed sewing machine including a link mechanism for interlockingly connecting a shaft and one end of a swing member, the needle feed sewing machine is provided at one end of the swing member through a through hole provided at one end of the link mechanism. A screw member that is connected to the swinging screw hole, and a fixing screw hole that is provided at the center of rotation of the rotating shaft and that connects the screw member through a through hole that is provided at one end of the link mechanism. Needle feed sewing machine characterized by having and. 2. A needle bar base having a vertically movable needle bar, which is swingably supported in the cloth feed direction, a rotary shaft which rotates for rocking the needle bar base, and its rotation. A swing member attached to the shaft and swinging according to the rotation of the rotation shaft, a needle bar swing shaft that is connected to the needle bar base and swings the needle bar base in the cloth feed direction, and the needle bar swing In a needle feed sewing machine including a link mechanism for interlockingly connecting a shaft and one end of a swing member, an attaching / detaching means capable of detachably connecting the one end of the swing member and the one end of the link mechanism, An engaging member that is provided at a rotation center position of the rotation shaft and that is connected to one end of the link mechanism separated from one end of the swing member by the attaching / detaching means. Needle feed sewing machine. 3. The needle feed sewing machine according to claim 1, further comprising an adjusting portion that is capable of adjusting a connecting position between the other end of the link mechanism and the needle bar swing shaft.