JPH0654978A - Thread cutting device for post type two-needle sewing machine - Google Patents

Abstract

PURPOSE:To perform the adjusting work of a thread cutting device in the movement of a shuttle pedestal while a post sewing machine is kept erected in a post type two-needle sewing machine erected with the lower sewing means of a rotary shuttle located below a sewing needle from a sewing machine bed. CONSTITUTION:A thread cutting device is provided with the first and second support arms 8, 16 angular position adjustably against the first and second erect shafts 7, 17 extended to the upper section in a post to drive the first moving knife M1 located above the post, and the position of the moving knife M1 of the thread cutting device is adjusted by the angular position adjustment of the first and second support arms 8, 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread cutting device for a post-type double-needle sewing machine, and more specifically, it enables quick and easy adjustment work for adjusting the position of a hook base and miniaturizes the shape of the post portion. The present invention relates to a thread cutting device for a post-type two-needle sewing machine.

[0002]

2. Description of the Related Art FIG. 3 is a view showing a post type sewing machine. In this post type sewing machine, a lower sewing means such as a rotary hook is formed in an upright type (post type) as shown in the figure. ing.

As a thread cutting device provided for such a post type sewing machine, a thread cutting device for a post type sewing machine disclosed in Japanese Patent Laid-Open No. 26595/1990 is currently proposed.

A thread cutting device for a post-type sewing machine, like a normal sewing machine, includes a cam that is fixed to an operating member by a solenoid and a lower shaft of a spindle of the thread cutting device horizontally provided in the sewing machine bed 1. The oscillating motion of the drive mechanism is oscillated through the link to perform the thread cutting drive. The drive of these support shafts is transmitted to the vicinity of the lower part of the sewing needle N (above the post part P) to make horizontal movement. The yarn is cut by the cooperation of a movable blade that horizontally reciprocates on the shuttle and a fixed blade that is fixed above the horizontal shuttle.

On the other hand, in a post type two-needle sewing machine having two needles, it is necessary to adjust and change the interval between the sewing needles according to the material to be sewn. With the change in the interval between the sewing needles, a thread cutting device ( The position of the moving knife) also needs to be adjusted and changed.

FIG. 4 shows a post portion P of a post type double needle sewing machine.
FIG. 2 is a perspective view showing the outer appearance of the machine, and the post parts P are provided on the sewing machine bed 1 in a pair on the left and right as shown in the drawing.
The yarn cutting device is formed of two pieces, and the yarn cutting devices are respectively stored in these hook bases P1 and P2.

Further, Pa is a post cover, which can be detached so that the inside of the post P can be inspected.

In such a post type sewing machine, when the distance between the sewing needles is changed, the sewing machine bed 1 and the post portion P are
Loosen the fixing screw 1a that secures the
The positions of the left and right yarn cutting devices are adjusted by moving 2 in opposite directions.

By the way, since the thread cutting device of this type is configured to drive the thread cutting at a predetermined position by a driving mechanism provided in the sewing machine bed 1, the sewing machine bed 1
On the other hand, when the shuttle is moved, the driving position of the moving knife is naturally changed, and it is necessary to relatively adjust the connection position relationship between the left and right thread cutting devices in the sewing machine bed 1.

The adjustment work in the sewing machine bed 1 is performed by turning the sewing machine upside down in the direction indicated by the arrow and starting from the bottom of the sewing machine.

Therefore, in the position adjustment work of the thread cutting device of the two-needle sewing machine, it is necessary to adjust the position of the left and right hook bases with the sewing machine standing and the connection position by reversing the sewing machine. The complicated work of standing up and reversing a plurality of times has been forced, resulting in a decrease in work efficiency.

[0012]

A thread cutting device for a post-type sewing machine according to the present invention is made to solve the above-mentioned conventional problems.
It comprises a moving knife driving means and a second moving knife driving means, and the first moving knife driving means forms an angle with respect to a driving shaft of a thread cutting device which is horizontally provided in the sewing machine bed and swings at the time of thread cutting. It comprises an oscillating body whose position is adjustable, an adjusting arm which is vertically adjustable on the oscillating body, and a connecting body which is connected to the upper part of the adjusting arm and converts the drive shaft drive into the horizontal direction. The drive converting means and a first vertical shaft which is rotatably supported by one of the stand of the sewing machine and which is rotated by the drive converting means and extends to an upper portion of the post of the sewing machine, and a first knife are swingably supported in a horizontal direction. A first female shaft and a first
A first drive arm fixed to the female shaft so that the angular position can be adjusted;
A first drive arm and a first connecting arm, both ends of which are rotatably supported by a first vertical shaft, respectively, and a second moving knife driving means is provided on the first vertical shaft so that an angle can be adjusted. A support arm, a bell crank rotatably provided in the horizontal direction, a link rotatably supported at one end of each of the first support arm and the bell crank, and a pivot on the other hook base of the sewing machine. The second that is supported and extends to the top of the sewing machine post
A vertical shaft, a second support arm fixed to the second vertical shaft so that the angular position thereof can be adjusted, a link whose both ends are rotatably supported by the other end of the bell crank and the second support arm, and a second motion. A second female shaft that supports the female so as to be swingable in the horizontal direction; and a second drive arm that is fixed to the second female shaft so that the angle can be adjusted,
An object of the present invention is to solve the above-mentioned conventional problems by including a second drive arm and a second connecting arm whose both ends are rotatably supported by a second vertical shaft.

[0013]

The thread cutting device for a post-type double-needle sewing machine according to the present invention has a first and a second driving arm fixed to the first and second vertical axes provided in the post so that their angular positions can be adjusted. By adjusting the angular position of, the position adjustment work of the thread cutting device according to the change of the spacing between the sewing needles can be performed with the post sewing machine standing.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a thread cutting device for a post type double needle sewing machine according to the present invention.

In the post type two-needle sewing machine, as shown in the drawing, a rotary hook and a thread cutting device are respectively housed in both hook bases provided in a pair on the left and right on the sewing machine bed.

Then, the first moving knife M1 and the first drive arm 1
1, a first connecting arm 10, an arm 7b, a first moving shaft 7 and the like, a first moving knife driving means A and a first supporting arm 8, a link L1, a bell crank C, a link L2, a second supporting arm 16, a second Vertical 1
7, arm 17a, second connecting arm 15, second drive arm 13, second
The yarn cutting device is formed from the second moving knife driving means such as the moving knife M2. K1 and K2 are horizontal rotary hooks.

FIG. 2 is an exploded perspective view of the thread cutting device for the post type double needle sewing machine shown in FIG. First, the first moving knife driving means A will be described in detail.

In FIG. 2, reference numeral 2 is a drive shaft of the thread cutting device, and the drive shaft 2 swings once as shown by the arrow when the sewing thread is cut.

Reference numeral 3 denotes an oscillating body which is provided on the drive shaft 2 so that its angular position can be adjusted by a screw 3a and has a groove portion 3b.

Reference numeral 6 denotes a drive converting means. The drive converting means 6 has an adjusting arm 4 which is provided in the groove 3b of the oscillating body 3 so as to be adjustable in position by a screw, and two spherical bearings, one of which is an adjusting arm 4. It is possible to convert the swing of the drive shaft 2 into a horizontal drive, and to adjust the drive amount of the connecting body 5 by adjusting the position of the adjusting arm 4, which is made up of the connecting body 5 connected to the upper part. You can do it.

Reference numeral 7 denotes a first vertical shaft, which has a length reaching the upper part of the post portion P, is supported by one of the hook bases P1 so as to be vertically rotatable, and has a lower end thereof by an arm 7a. Connector 5
Is connected to the other spherical bearing and is rotated by the drive shaft 2. On the other hand, M1 is the first moving knife,
The first one provided on one of the shuttle bases P1 so as to be horizontally swingable.
It is fixed to the upper end of the female shaft 12.

Reference numeral 11 is a first drive arm which is connected to the first female shaft 12 by a screw 11a so that the angular position can be adjusted.

Numeral 10 is a first connecting arm which is rotatably supported at its both ends by the first drive arm 11 and the arm 7b of the first vertical shaft 7.

The first moving knife drive means A having the above-described configuration transmits the drive of the drive shaft 2 to the first vertical shaft 7 by the drive changing means 6 to rotate the same.

Then, the first moving knife M1 can be reciprocally driven through the first connecting arm 10 as shown by an arrow to perform predetermined thread cutting.

Next, the second moving knife driving means B will be described in detail. In FIG. 2, 8 is a screw 9 with respect to the above-mentioned first vertical shaft 7.
Is a first support arm that is adjustable in angular position, and is rotatable with the first vertical shaft 7.

Further, C is a bell crank provided on the other hook base P2 so as to be rotatable in the horizontal direction.

L1 is a link rotatably supported at one end of the arm 8a of the first support arm 8 and one end of the bell crank C. The first support arm 8 is driven by the bell crank C.
Can be transmitted to.

Reference numeral 17 is a second vertical shaft which is rotatably supported on the other hook base P2 in a vertical direction, and its upper end extends to the upper portion of the post portion P.

Reference numeral 16 is a second support arm provided on the second vertical shaft 17 so as to be adjustable in angular position by a screw 18. L2 is the other end of the bell crank C and the arm 16 of the second support arm 16.
It is a link whose both ends are rotatably supported by a and a, respectively, and the drive of the bell crank C can be transmitted to the second vertical shaft 17.

On the other hand, M2 is a second moving knife, and a second knife shaft 19 is provided on the other hook base P2 so as to be horizontally swingable.
It is fixed at the top of.

Reference numeral 13 is a second drive arm which is connected to the second female shaft 19 by a screw 19a so that the angular position can be adjusted.

A second arm 15 is rotatably supported at its both ends by the drive arm 13 and the arm 17a of the second vertical shaft 17.
It is a connecting arm.

The second moving knife driving means B configured as described above transmits the drive of the first standing shaft 7 of the first moving knife driving means A to the second standing shaft 17 by the bell crank C.

Then, the second moving knife M2 can be reciprocally driven through the second connecting arm 15 as shown by an arrow to perform predetermined thread cutting.

In the thread cutting device of the post type two-needle sewing machine configured as described above, the left and right hook bases P1 and P2
The position adjustment of the thread cutting device accompanying the movement of the second part is performed by removing the post cover Pa (see FIG. 4) of the post part P and adjusting the angular position of the first vertical shaft 7 and the first support arm 8 (by the screw 9) and the second The angular position of the vertical shaft 17 and the second support arm 16 may be adjusted (by the screw 18).

In adjusting the position of each moving knife M1 and M2, the knife shaft 1 is screwed by the screw 11a and the screw 19a.
The angular positions of 2 and 19 may be changed.

As described above, the position adjustment in the thread cutting device of the post type double needle sewing machine according to the present invention is performed by the post portion P.
That is, since it is possible to perform the work above the sewing machine bed 1, it is possible to quickly and easily perform the adjustment work while standing up without turning the sewing machine upside down and working from the bottom, thereby improving the work efficiency. I can.

Further, in the past, since the female shaft was extended to the lower surface of the bed and connected to the drive mechanism, the component parts became large in order to increase the rigidity of the shaft, resulting in a large post portion. According to the present invention, the second moving knife driving means B including the first moving knife driving means A and the bell crank C is laminated inside the post portion P, so that the entire post is compactly integrated.

[0040]

As described above, in the thread cutting device for a post-type double-needle sewing machine according to the present invention, a support arm is provided on the vertical shaft provided in the post so that the angular position can be adjusted, and the connecting angle between the two can be adjusted. By doing so, the adjustment work of the thread cutting device can be performed when the shuttle base is moved, so that the adjustment work can be performed with the post type sewing machine standing upright without being inverted, and the work efficiency can be improved. It will be possible. Further, since the second moving knife driving means B including the first moving knife driving means A and the bell crank C is laminated inside the post portion, there is an advantage that the entire post becomes compact and the like.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a thread cutting device for a post-type double-needle sewing machine according to the present invention.

FIG. 2 is an exploded perspective view of a thread cutting device for the post-type double-needle sewing machine shown in FIG.

FIG. 3 is a front view showing a post-type sewing machine.

FIG. 4 is an external perspective view showing a post portion of a post-type sewing machine.

[Explanation of symbols]

 A first moving knife driving means B second moving knife driving means C bell crank 2 driving shaft 3 rocker 4 adjusting arm 5 connecting body 6 drive converting means 7 first standing shaft 8 first supporting arm 10 first connecting arm 11 first Drive arm 12 1st female shaft 13 2nd drive arm 15 2nd connection arm 16 2nd support arm 17 2nd standing shaft 19 2nd female shaft M1 1st moving knife M2 2nd moving knife

Claims (1)

[Claims] 1. A thread cutting device in a post type two-needle sewing machine, wherein a lower sewing means such as a rotary hook located below a sewing needle is provided so as to stand upright from a sewing machine bed. The driving means and the second moving knife driving means are provided, and the first moving knife driving means is capable of adjusting the angular position with respect to the driving shaft of the thread cutting device which is horizontally provided in the sewing machine bed and swings at the time of thread cutting. Drive conversion including an oscillating body provided on the oscillating body, an adjusting arm provided on the oscillating body so that the position of the oscillating body can be adjusted in a vertical direction, and a connecting body connected to an upper portion of the adjusting arm and converting the oscillating of the drive shaft into a horizontal drive. And a first vertical shaft that is rotatably supported by one of the hooks of the sewing machine and is rotated by the drive converting means and extends to the upper part of the post of the sewing machine and the first moving knife so as to be horizontally swingable. Angle to the first female shaft and the first female shaft Second moving knife driving means, which includes a first driving arm fixedly adjustable in degree and a first connecting arm rotatably supported at both ends by the first driving arm and the first vertical shaft. Includes a first support arm provided on the first vertical shaft so as to be adjustable in angular position, a bell crank rotatably provided in a horizontal direction, and both ends of the first support arm and the bell crank at both ends thereof. A supported link, a second vertical shaft that is rotatably supported by the other hook of the sewing machine and extends to the upper part of the post of the sewing machine, a second support arm that is fixed to the second vertical shaft so that its angular position can be adjusted, and a bell crank. The other end of which is rotatably supported by the second support arm, and the second female shaft that rotatably supports the second moving knife in the horizontal direction. A second drive arm that is adjustably fixed; a second drive arm and a second drive arm; A thread cutting device for a post-type two-needle sewing machine, comprising: a second connecting arm, both ends of which are rotatably supported by two vertical shafts.