JPH0325738Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an overlock sewing device for an overlock sewing machine that folds the edge of a work cloth upward and performs overlock stitching on the folded edge of the work cloth. .

[Prior Art] As shown in FIGS. 6 and 7, this type of device has a presser foot 40 disposed so as to be able to press toward the throat plate 20, and a presser foot 40 that cooperates with the presser foot 40 to press the presser foot 40. A feed dog 50 that imparts a feed motion to the work cloth A on the throat plate 20, a wrapper body 80 that wraps the edge of the work cloth A upward as the work cloth A passes, and the right side of the needle drop point 20A of the sewing needle 30. In the vicinity, the Latsupa body 8
The presser foot 40 is provided in order to press the edge of the work cloth A discharged from the presser foot 40 from above and to temporarily support the seam thread of the overlock stitch formed on the edge. A work cloth discharge port 81 of the ratchet body 80
was located further away from the needle drop point 20A. The edge of the work cloth A that was bent upward by the wrapper body 80 was guided and sewn between the lower surface of the claw body 60 and the upper surface of the throat plate 20.

[Problems to be solved by the invention] However, when performing small-turn sewing on corners of the work cloth A, the needle drop point 20A and the exit of the tweezers body 80 are provided apart from each other.
Since the folded portion of the unsewn work cloth A that was bent by the wrapper body 80 at a position between 0A and the work cloth discharge port 81 of the wrapper body 80 attempts to restore to the state before being folded, small-turn sewing is performed. It was difficult.

[Purpose of the invention] This invention was made in view of the above circumstances, and its purpose is to provide a top-roll sewing device for an overlock sewing machine that maintains the folded state of the edge of the work cloth A even when performing small-turn sewing. It is provided by.

[Means for Solving the Problems] In order to solve the above problems, the upper winding sewing device of the overlock sewing machine of the present invention wraps the edges of the work cloth upward and then creates an overlock seam on the edges. a presser foot, which is disposed on the throat plate and has a notch that extends at least from the needle drop point to the cloth feed side and opens to the right when viewed from the cloth feed side; a wrapper body that is arranged in the notch and has a work cloth discharge port located on the side near the needle drop point, and wraps the edge of the work cloth upwardly; a claw body which is disposed close to a position facing the wrapper body and which presses the edge of the work cloth wound above the wrapper body from above and temporarily supports the seam thread of the overlock seam; What is configured is considered to be configured.

[Operation and effects of the invention] The upper winding sewing device of the overlock sewing machine of the present invention having the above-mentioned configuration has the work cloth discharge port of the wrapper body on the side near the needle drop point, thereby changing the traveling angle of the work cloth. Also, since the edges of the work cloth before sewing are kept in a folded state by the wrapper body, the work cloth can be easily sewn in small turns.

[Embodiment] Next, the upper winding sewing device of the overlock sewing machine of the present invention will be explained based on an embodiment shown in the drawings.

The overlock sewing machine 1 has a machine frame 10 and a throat plate 2.
0, a sewing needle 30, a presser foot 40, a feed dog 50, and a claw body 60 are provided at least.

The throat plate 20 includes a sewing needle through hole 21 through which the sewing needle 30 that reciprocates up and down by a known mechanism passes through at the needle drop point 20A, and a lower hole for the lower looper that temporarily supports the lower looper thread during stitch formation. A feed dog elongated hole 23 in which the claw body 22 and the feed dog 50 are arranged is formed. This throat plate 20 is attached to the machine frame 10 with screws 11.

The presser foot 40 is provided so as to be pressable toward the throat plate 20 from above the throat plate 20 by a known mechanism. The feed side (lower side in the figure) of the presser foot 40 for the work cloth A is provided shorter than the feed side. Further, this presser foot 40 is provided with a notch 41 that opens on the right side, and a seam is formed within the notch 41.

The feed dog 50 is provided below the presser foot 40, and cooperates with the presser foot 40 to perform a known four-movement feed that imparts a feed motion to the work cloth A on the throat plate 20. A portion of the feed dog 50 that does not face the presser foot 40 is formed as a flat portion 51 so as not to protrude or retract from the throat plate 20 despite the feed movement.

The claw body 60 temporarily supports the upper looper thread supplied by the upper looper 70 during stitch formation. This claw body 60 is attached to the machine frame 1
0 to the support member 13 fastened with the screw 12,
It is attached with a screw 14 so that its tip is located near the needle drop point 20A. The upper looper yarn support portion of the claw body 60 is provided with a substantially L-shaped cross section, and supports the upper, end, and lower edges of the edge of the work cloth A bent by the wrapper body 80 described below. , the lower surface and side surface of the claw body 60, and the throat plate 20.
It is designed so that it can be squeezed with the top surface of the. In this embodiment, the supporting portion of the upper looper thread of the claw body 60 has a substantially L-shaped cross section, but the upper, end, and lower edges of the folded work cloth A are Other shapes, such as an abbreviated shape or a U-shape, may be used as long as the shape is strong.

The wrapper body 80 is of a known type, and has a scroll shape that is narrow on the work cloth discharge port 81 side (upper side in the figure), and bends the edge of the work cloth A upward. This wrapper body 80 has a work cloth discharge port 81.
is attached to the support member 31 with a screw 14 together with the claw body 60 so as to be in contact with the entrance side of the work cloth A of the claw body 60 near the right side of the needle drop point 20A in the notch 41.

Next, the operation of the above embodiment will be explained assuming that a work cloth A (for example, pile fabric) having a loop on its surface is sewn.

The workpiece cloth A is sent upward in the drawing by the known operation of the presser foot 40 and the feed dog 50. When the edge of the work cloth A (on the right side in the figure) is fed by the presser foot 40 and the feed dog 50, it passes through the wrapper body 80, so that it is wound upward and passes through the work cloth discharge port 81.
It is squeezed and bent. At this time, the loops on the surface of the work cloth A are squeezed by the inner surface of the wrapper body 80, so that they are laid down in a direction opposite to the direction of movement. Since the inlet of the claw body 60 is arranged opposite to the work cloth discharge port 81 of the wrapper body 80, the loop laid down by the wrapper body 80 is guided into the claw body 60 in the laid state. It will be destroyed. The edge of the upwardly bent work cloth A guided into the claw body 60 is connected to the claw body 60.
Since the loop is squeezed by the lower and side surfaces of the needle plate 20 and the upper surface of the throat plate 20, the loop is sewn in a lying state. Therefore, as shown in FIG.
Overlock stitching can be performed neatly without the loop B protruding from the seam formed in the seam. In addition,
A similar effect can be obtained when sewing the work cloth A having a long pile.

A case will be described in which small-turn sewing is performed on corners of the work cloth A.

At this time, the feed side of the workpiece cloth A of the presser foot 40 is provided short, and the feed dog 50 is formed with a flat portion 51, so that the operation to change the advancing angle of the workpiece cloth A can be easily performed. . The edge of the work cloth A is rolled upward and discharged from the wrapper body 80, but the work cloth A is immediately held in its folded state by the claw body 60. This prevents the edge of the work cloth A from returning to its original position during small-turn sewing, making it possible to easily perform small-turn sewing.

Other embodiments of the present invention are shown in FIGS. 4 and 5.

In this embodiment, the claw body 60 is abolished, and the work cloth discharge port 81 of the wrapper body 80 is arranged at the position of the claw body 60 that supports the upper looper thread. It has the role of a claw body 60.

[Brief explanation of the drawing]

Fig. 1 is a top view of the upper winding sewing device of the overlock sewing machine of the present invention, and Fig. 2 is shown in Fig. 1.
3 and 8 are top views showing seams formed in a work cloth having loops; FIG. 4 is a top view showing another embodiment of the present invention; and FIG. 4 is a cross-sectional view taken along the line shown in FIG. 4, FIG. 6 is a top view of the upper winding sewing device of a conventional overlock sewing machine, and FIG. 7 is a cross-sectional view taken along the line shown in FIG. 6. In the figure 1... Overlock sewing machine, 10... Machine frame, 20... Throat plate, 20A... Needle drop point, 30...
... Sewing needle, 40 ... Presser foot, 50 ... Feed dog, 6
0...Claw body, 70...Upper looper, 80...Ratsupa body.

Claims (1)

[Claims for Utility Model Registration] 1. In a sewing machine that forms an overlock stitch on the edge of a workpiece cloth after the edge thereof is rolled upward, The presser foot has a cutout extending over the cloth feed side and opening on the right side when viewed from the cloth feed side, and a work cloth discharge port disposed within the cutout and located on the side near the needle drop point. , a wrapper body that wraps the edge of the work cloth upwardly, and a wrapper body disposed in the notch in close proximity to a position facing the work cloth discharge port of the wrapper body,
An overlock sewing machine comprising a claw body that presses the edge of the work cloth wound above the wrapper body from above and temporarily supports the seam thread of the overlock seam. Upper winding sewing device. 2. The claw body is bent into a substantially L-shaped cross section so as to squeeze the upper, end, and lower edges of the edge of the work cloth bent by the front wrapper body together with the throat plate. An upper winding sewing device for an overlock sewing machine according to claim 1 of the utility model registration claim. 3. The upper winding sewing device for an overlock sewing machine according to claim 1 or 2, wherein the claw body is provided separately from the presser foot and the wrapper body. 4. The ratchet body and the claw body are integrally formed, and the work cloth discharge port of the ratchet body extends to the side near the needle drop point so as to be used as the claw body. An upper winding sewing device for an overlock sewing machine as claimed in claim 1 of the registered utility model. 5 The feed side of the work cloth of the presser foot is provided shorter than the feed side, and the portion of the feed dog that protrudes and retracts from the throat plate that does not face the presser foot has a flat portion so as not to protrude from the throat plate. An upper winding sewing device for an overlock sewing machine as set forth in claim 1 of the patented utility model registration claim.