JPS582308Y2 - sewing machine - Google Patents

Description

[Detailed description of the invention] This invention consists of an overlocking looper mechanism for forming an overlocking stitch in cooperation with a needle, such as an overlocking stitch sewing machine, and a looper mechanism that operates parallel to the overlocking stitch. Regarding a sewing machine equipped with a double ring looper mechanism for forming layered stitches, in particular, a lock for interlocking and disconnecting between the overedge looper mechanism and a looper drive shaft for driving it. The present invention relates to a sewing machine which is equipped with a mechanism and whose overlocking looper mechanism is stopped by shutting it off so that only double layer seams can be formed.

Hereinafter, an embodiment of this invention will be explained with reference to drawings.In the bed of a sewing machine frame (not shown), a drive shaft 1 for integrating the hemlock louver and a drive shaft 2 for integrating the double ring looper are installed. The drive shaft 2 is connected to the sewing machine drive unit (not shown) parallel to the cloth feeding direction (direction of arrow a in FIG. Further, the drive shafts 1 and 2 are connected to the drive shafts 1 and 2 so as to swing about the axis and reciprocate in the axial direction in conjunction with the drive shaft.
A transmission body 3 is disposed such that one end thereof protrudes from the front side surface of the machine frame facing the operator, and the protruding portion of the drive shaft 1 has a concave groove 3a parallel to the axis of the drive shaft 1 formed on the one end surface. A rocking body 4 is loosely supported at one end and has a concave groove 4a parallel to the axis of the drive shaft 1 corresponding to the concave groove 3a of the transmission body 3 on one end face in front of the rocking body 4, which is fixed with a screw 5. A locking body 6 is fixed to the protruding end of the drive shaft 1 with a screw 7 with a certain gap between it and the swinging body 4.

On the drive shaft 1 between the rocking body 4 and the locking body 6, grooves 3 a and 4 of the transmission body 3 and the rocking body 4 are formed, respectively.
A locking body 9 having a fitting piece 8 projecting toward the direction a and having a tapered projecting end is fitted and arranged so as to be slidable in the axial direction of the drive shaft 1.

As shown in FIGS. 3 and 4, when the locking body 9 is in a position close to the rocking body 4 (solid line position), the fitting piece 8 is inserted into the grooves 4a and 3a of the rocking body 4 and the transmission body 3, respectively. When the locking body 9 is in a position close to the locking body 6 (the position indicated by the two-dot chain line), it is only inserted into the groove 4a of the rocking body 4 and removed from the groove 3a of the transmission body 3. It is long enough to

Further, a groove 10 is formed in the protruding end of the drive shaft 1, and an elastic body 11 having one end curved is placed in the groove 10 so that the curved part protrudes outside the outer peripheral surface of the drive shaft 1. Deploy.

As shown in FIG. 3, this elastic body 11 acts to lock the locking body 9 in the solid line position or the two-dot chain line position, and the operator can move the locking body 9 in these positions. When sliding operation is performed from one side to the other, the curved portion is pressed into the groove 10 to allow the locking body 9 to slide.

Below the throat plate 12, which is placed on a fabric support stand (not shown) formed on the left side of the sewing machine frame, one end of the connecting link 13 can be rotated toward the front side of the machine frame by means of a shaft 14 parallel to the drive shaft 1. The middle part of a looper unit 16 having a looper tip 15 for overlocking at the upper end is rotatably connected by a shaft 17 parallel to the drive shaft 1, and the lower end of the looper unit 16 is connected to the The body 3 is rotatably connected to the other end of the body 3 by a shaft 18 parallel to the drive shaft 1 .

On the other hand, the lower end of a looper unit 20 having a looper tip 19 for a double ring at the upper end is fixed to the protruding end of the drive shaft 2, and although not shown, the sewing machine arm has a vertical movement in conjunction with the sewing machine driving part. At the lower end of the needle bar, a needle 21 for forming an overlock stitch in cooperation with the looper unit 16 for overcasting and a looper unit 20 for double loops are arranged. A needle (not shown) is placed to cooperate with the needle to form a double chain stitch.

This invention has the above structure, and its operation will be explained next.

First, when forming an overlock seam and a double chainstitch die, as shown by the solid lines in FIG. 1 and FIGS. If the locking body 8 is moved to a position close to the sliding body 4 and the sewing machine is driven,
The drive shaft 1 swings around its axis, and the swinging body 4 swings.

Due to the rocking of the rocking body 4, the fitting piece 8 of the locking body 9 fitted into the groove 4a is rocked, and the locking body 9 also moves toward the drive shaft 1.
The transmission body 3 begins to swing around the axis of the transmission body 3.
The fitting piece 8 of the locking body 9 allows the locking body 9 to swing together with the rocking body 4.

Due to this swinging of the transmission body 3, the looper unit 16 swings around the axis of the shaft 17, which is the connection point with the connecting link 13, and the connecting link 13 swings around the shaft 14, so that the looper tip The needle 15 moves in an arcuate path between the upper and lower points that sandwich the throat plate 12 (Fig. 5), and the needle 21 moves at the upper and lower points.
In cooperation with this, an overlock seam is formed.

On the other hand, the drive shaft 2 swings around its axis and reciprocates in the axial direction, so that the looper tip 19 of the integrated looper 20 is attached to a needle other than the needle 21 below the throat plate 12. The needle moves in an elliptical trajectory surrounding the path of the needle (not shown), and forms a double chain stitch in cooperation with the needle.

Next, when forming only a double chain stitch mill, the locking body 9 is
, 4 to the position shown by the two-dot chain line in FIG. Not transmitted, driver 1
is only swinging within the fitting hole of the transmission body 3.

Therefore, the looper tip 15 of the looper unit 16 does not perform the above-mentioned movement and rests, and an overedge stitch is no longer formed, and only a double chain stitch is formed by the cooperation of the looper tip 19 of the looper unit 20 and the needle. will be done.

The elastic body 11 disposed on the drive shaft 1 is intended to prevent the locking body 9 from shifting from its position due to vibrations of the sewing machine or the like when it is located at the solid line position or the two-dot chain line position. For example, the fitting piece 8 may come off from the concave groove 3a of the transmission body 3 during the formation of the hem seam, or the integrated looper 16 for hem oversewing may be suspended to form only a double chainstitch mill. At this time, the fitting piece 8 is prevented from fitting into the groove 3a.

As described above, this invention consists of a looper drive shaft that swings in conjunction with the driving part of the sewing machine, a swinging body that is fixed to the looper drive shaft and forms a fitting part, and one end of which is loosely fitted to the looper drive shaft and the swinging body is fitted. A transmission body formed with a fitting part corresponding to the part is movable between three positions on the looper drive shaft or on an axis parallel to the looper drive shaft, and in one of the positions, the transmission body swings in conjunction with the swinging body. a locking body that can be fitted into one or both of the fitting parts at one position and detachable from one or both of the fitting parts so as to interrupt the interlocking at the other position; A connecting link is rotatably supported at the center, has a looper tip at the upper end, and the middle part is rotatably supported at the other end of the connecting link, and the lower end is rotatably supported at the other end of the transmission body. The looper is driven in conjunction with the looper drive shaft by being equipped with a looper that moves in an arc so that the looper tip works with the needle at the top and bottom points of the throat plate to form an overlock stitch. It is possible to interrupt the linkage and suspend the operation.
For example, when applied to an overlock sewing machine equipped with an overlock looper mechanism and a double chain looper mechanism, it is possible to sew an overlock stitch and a double chain stitch at the same time, or to sew only a double chain stitch. In addition, by simply moving the locking body in the axial direction of the looper drive shaft, the interlocking and disconnection of the looper and its drive shaft can be easily switched, making it easy to use for overlock sewing machines. If the drive shaft of the overlocking looper protrudes toward the operator from the front side of the sewing machine frame, and the looper is integrally placed on the protruding part, the operator cannot move the locking body. If you do,
There is no need to insert a finger between the looper and other mechanisms of the sewing machine disposed close to the looper, such as the feed mechanism or the fixed knife for cutting cloth, to perform the above operations.
Since the operation can be easily performed and fingers are not injured by the fixed scalpel etc., there are advantages such as excellent operability and safety.

In the above embodiment, the locking body 9 on which the fitting piece 8 is formed is movably supported on the drive shaft 1, and the movement operation causes the locking body 9, which is always inserted into the groove 4a of the rocking body 4, to be inserted into the groove 4a of the rocking body 4. Although the piece 8 is shown to be inserted into or removed from the concave groove 3a of the transmission body 3, as shown in FIG. Hole 3b
, 4b, provided with an operating knob 22 at one end, and provided with grooves 23a and 23b at two locations on the outer periphery of the shaft portion.A locking pin 23 is arranged so as to be fitable into the respective fitting holes 3b and 4b. At the same time, a notch 4C is formed on one end surface of the rocking body 4, and a wire spring 24 that enters the fitting hole 4b from the notch 4C is fixedly arranged on the rocking body 4, and the wire spring 24 is attached to the lock pin 23. By fitting into the grooves 23a and 23b of the locking pin 23, the locking pin 23 can be locked in two positions in the axial direction, and when the locking pin 23 is locked in one of the positions (the state shown in FIG. 6), the locking pin When the other end of 23 fits into the fitting hole 3b of the transmission body 3 and is locked in the other position, the fitting hole 3b
The same effects as in the above embodiment can be obtained even if they are arranged so as to be separated from each other.

Further, in the above embodiment, only the fitting piece 8 of the locking body 9 is detachable from the groove 3a of the transmission body 3, but the groove 3a of each of the transmission body 3 and the rocking body 4 is ,
Of course, even if it is separated from 4a, the effects of the above embodiment can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the looper mechanism, and FIG. 2 is an exploded perspective view of the linkage mechanism between the overlocking looper and its drive shaft.
Figure 3 is a sectional view taken along line III-II■' in Figure 1;
□FIG. 4 is a bottom view of the linkage mechanism, FIG. 5 is a front view of the looper mechanism, and FIG. 6 is a sectional view corresponding to FIG. 3, showing another embodiment. Looper drive shaft...1, oscillating body...4
, fitting part of the rocking body...4a, transmission body...
・3. Fitting part of the transmission body...3a, Locking body...
...9, Connecting link...13, Throat plate...
...12, looper integrated...16°

Claims (1)

[Scope of utility model registration request] A looper drive shaft that swings in conjunction with the sewing machine driving section, a swinging body that is fixed to the looper drive shaft and forms a fitting part, and a fitting that has one end loosely fitted to the looper drive shaft and corresponds to the fitting part of the swinging body. The transmission body forming a joint can be moved between three positions on the looper drive shaft or on an axis parallel to the looper drive shaft, and in one of the positions, the transmission body swings in conjunction with the swinging body. A locking body that can be inserted into one or both of the fitting parts and can be detached from one or both of the fitting parts so as to interrupt the interlocking in the other position, and interposed between the locking body and the drive shaft or the swinging body. an elastic body that always presses the locking body, allows the locking body to move, and has an elastic force that locks the locking body in one or the other position; The connecting link is rotatably supported, and the upper end has a looper tip, the middle part is rotatably supported at the other end of the connecting link, the lower end is rotatably supported at the other end of the transmission body, and the looper tip is supported by the swinging of the transmission body. A sewing machine equipped with a louver that moves in an arc so as to cooperate with the needle at the upper and lower points of the throat plate to form an overlock stitch.