JPH0616622Y2 - Empty chain stitching device for overedge sewing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is concerned with a ring of yarns (empty ring) formed continuously from the edge of a cloth.
The present invention relates to an empty chain stitching device for an overlock stitch sewing machine having a so-called auto back tack function, in which is automatically sewn into the first portion of a new cloth.

[Prior Art] Conventionally, as a sewing machine of this type, for example, JP-A-61-4
The one described in Japanese Patent No. 5797 is known. In this device, the empty ring formed in series with the cloth edge is sucked and cut by the empty ring catcher to temporarily hold it in the suction port, and the empty ring held in the suction port is held by the empty ring transfer device. The empty ring is transferred to the vicinity of the guide groove, the empty ring is directly pressed and held by the rod end of the air cylinder, and the empty ring is sewn into the first portion of the new cloth.

[Problems to be solved by the invention] However, in the conventional sewing machine, since the hollow ring in the guide groove formed on the upper surface of the presser foot is directly pressed by the rod end of the air cylinder, the hollow ring is held. It is difficult to adjust the force, and since the presser foot is pushed by the rod end, it is difficult to set the presser force according to the cloth thickness. Furthermore, in the conventional sewing machine, the work clamp not only moves vertically while maintaining the horizontal state, but also tilts in the front-back direction (the direction of feed of the fabric), so the rod end cannot follow the movement of the work clamp, and There is a problem that the holding tends to be uncertain.

[Means for Solving Problems] An empty ring sewing device of an overedge sewing machine according to the present invention, which is made to solve the above problems, has an empty ring continuously formed from a cloth end from a suction port. Along with sucking, the empty ring catcher having a cutting knife for cutting the empty ring sucked into the suction port, the presser foot having the guide groove for inserting the empty ring formed on the upper surface, and the suction port of the empty ring catcher The held empty ring is sucked and captured by the suction port of the suction pipe, and the empty ring transfer means for transferring to the vicinity of the guide groove, and the empty ring of the suction port transferred by the empty ring transfer means from the suction port. An empty ring holding means for separating and holding the empty ring in the guide groove, wherein the empty ring holding means is rotatably supported on the upper surface side of the presser foot at its intermediate portion, Of the air ring in the guide groove by one end of the And sky ring retainer for lifting,
A spring that is provided on the cloth retainer and always biases the idler retainer in a direction that presses the idler ring against the guide groove or in a direction opposite to the direction, and is provided opposite to the other end of the idler retainer. And an operating member that presses or releases the air ring pressing member against the spring force, and a movable mechanism that holds or separates the air ring in the guide groove by moving the operating member. Is characterized by.

[Operation] The empty ring that is formed continuously from the edge of the fabric after finishing the overedging,
It is sucked into the suction port of the air ring trap, cut by a cutting knife, and temporarily held at the suction port. Subsequently, the empty ring held by the suction port is sucked and captured by the suction port of the suction pipe of the empty ring transfer means, and transferred to the guide groove provided in the cloth retainer. Then, the empty ring of the guide groove is held by the empty ring holding means and is sewn on to the new overedging of the cloth.

Here, the empty ring holding means includes an empty ring presser that is rotatably supported on the upper surface side of the cloth presser, and a direction or a direction in which the empty ring is always pressed against the guide groove with respect to the empty ring presser. A spring for urging a spring force in the opposite direction is provided, and an operating member provided opposite to the other end of the aerial ring presser is moved to press or release the aerial presser foot against the spring force. By doing so, the empty ring is retained or desorbed.

Therefore, in the present invention, since the air presser foot is incorporated in the cloth presser itself, even if the cloth presser tilts in the front-back direction when the cloth is pressed, the air presser foot follows the movement of the cloth presser. , Can always hold the empty ring surely.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are diagrams schematically showing the essential parts of an embodiment of an overedge sewing machine. FIG. 1 is a side view, FIG. 2 is a rear view, FIG. 3 is a plan view, and FIG. Is a front view, fifth
6 and 6 are diagrams showing the operation.

In FIG. 1, a machine frame 3 having a built-in drive mechanism is provided on the side of the sewing machine bed 1. A cloth presser 7 is provided on the needle plate 5 (see FIG. 3) on the sewing machine bed 1,
A needle 9 is installed so as to be inclined upward with respect to the cloth retainer 7. The cloth retainer 7 can be vertically moved while maintaining a horizontal state, and can be tilted in the front-rear direction (the cloth feeding direction).

A characteristic empty-loop stitching device of this embodiment is an empty-loop catcher 13 provided on the cloth feed side (lower center in the drawing) of the needle plate 5 of the sewing machine bed 1, an empty-loop transfer means 15, and an empty loop. Presser foot drive means 17
And a presser foot base (empty ring presser) 71 provided on the presser foot 7
(See FIG. 7) and are the main components.

The air ring trap 13 has a suction port 21 on the upper surface of the sewing machine bed 1.
A vacuum pump (not shown) is connected to the suction port 21 via a suction pipe 23. Two cutter blades (not shown) are provided inside the suction port 21, and at the same time, the suction ring 21 sucks an empty ring continuously formed from the fabric end and cuts the empty ring. And then remove it from the cloth.

The empty ring transfer means 15 serves as an actuator for the machine frame 3
A first air cylinder 33 vertically mounted on the rear support portion 31 and a second air cylinder 37 horizontally mounted on a support base 35 above the machine frame 3 are provided. At the lower end of the rod 33a of the first air cylinder 33, an inverted L-shaped transfer pipe guide member 39 (see FIG. 2) having a horizontally elongated hole 39a is mounted by a nut 41. On the other hand, a support member 43 is fixed to the tip of the rod 37a of the second air cylinder 37. One end of a connecting rod 45 is rotatably supported by a shaft 47 on the support member 43. The connecting rod 45 is supported by the shaft 49 of the supporting portion 31 in the middle thereof,
Further, the other end is connected to the link piece 51 by a pin 53. The other end of the link piece 51 is connected to the transfer pipe guide member 3
9 is a pin 56 (see FIG. 2), which is a suction pipe supporting portion 55 penetrating through the long hole 39a of FIG.
It is rotatably supported by. The suction pipe 57 is held at one end by the suction pipe support portion 55. The suction pipe 57 is supported by the suction pipe support portion 55 as described above and is also supported by the support portion 59 so as to be rotatable and slidable with respect to the machine frame 3, and has one end portion 57a (left side in the drawing). Is connected to a vacuum pump (not shown).

The empty ring presser driving means 17 supports the supporting portion 6 with respect to the machine frame 3.
It is provided with a third air cylinder 63 (movable mechanism) vertically supported by 1. At the tip of the rod 63a of the third air cylinder 63, the plate-shaped operating member 6
5 is attached. Further, as shown in FIG. 7, a presser base (empty ring presser) 71 is rotatably attached to the upper surface of the cloth presser 7 below the third air cylinder 63 by a screw 73. The pressing base 71 is constantly urged by a spring 75 mounted on the outer periphery of the screw 73 in the direction of arrow k. At one end of the presser base 71,
An upright portion 71a that presses and contacts the operating member 65 at the lower end of the third air cylinder 63 is formed, and a pressing portion 71c is formed at the other end. This pressing part 71c
A guide groove 79 is formed on one surface between the protruding portion 77 that is erected from the upper surface of the cloth pressing member 7, and when the erected portion 71c is pressed by the operating member 65, the pressing portion 71c is pressed by the spring 75. It rotates in the direction of arrow 1 against the spring force (FIG. 8), and the pressing portion 71c rotates so as to narrow the guide groove 79 between the pressing portion 71c and the protruding portion 77.

Next, the operation of the embodiment will be described.

Now that the sewing is completed, as shown in FIG.
When the rear end of 0 passes through the stitch forming point, an empty ring C is formed in series at the end of the work cloth 100, and one end of the empty ring C is wound around the claw (not shown) of the needle plate 5.

One end of the air ring C is sucked into the suction port 21 of the air ring trap 13 and cut by a cutter blade to be sucked into the suction port 21.
Is once captured.

Next, air from an air pump (not shown) is supplied to the first air cylinder 33 by switching the direction control valve,
As shown in the figure, the rod 33 of the first air cylinder 33
The transfer pipe guide member 39 attached to a moves up. As a result, the suction pipe 57 is moved to the long hole 39a of the transfer guide member 39
The end portion 5 supported by the suction tube support portion 55 supported by
7a rises. At this time, the suction tube 57 has the support portion 59.
It is supported by the suction port 5
7b reaches the vicinity of the suction port 21 of the air ring trap 13, and the suction tube 57 sucks the air ring C. Then, the first air cylinder 33 is returned to return the suction pipe 57 to the fixed position in the horizontal state.

Next, as shown in FIG. 6, the second air cylinder 37
When air is supplied to the rod 37a and the rod 37a extends, the connecting rod 45 rotates about the shaft 49, and the suction pipe 57 slides on the support portion 59 through the link piece 51 and the suction pipe support portion 55 to move forward. The suction port 57b moves to reach the vicinity of the presser foot 7. At this time, as shown in FIG.
The empty ring C hanging down from is guided into the inside of the guide groove 79 provided in the presser foot 7.

Next, the third air cylinder 63 (FIG. 4) is operated, and the operating member 65 attached to the lower end of the rod 63a is operated.
Moves downward. As a result, as shown in FIG.
The lower end of the operating member 65 hits the standing portion 71a of the presser base 71, and the presser base 71 resists the spring force of the spring 75 and screws 73.
By rotating in the direction of the arrow l around the center, the holding portion 71c and the protruding portion 77 facing the holding portion 71c sandwich the empty ring C in the guide groove 79.

In this state, when a new work cloth is placed on the needle plate 5 and a predetermined number of stitches are sewn, the third air cylinder 63 returns and the operating member 65 rises. By such a series of operations, the empty ring C clamped in the guide groove 79 is released from here and sewn into the overedging of the new cloth edge.

Therefore, according to the above-mentioned embodiment, after the empty loop C in which the work cloth 100 is continuous is cut and captured by the empty loop catcher 13, it is transferred to the vicinity of the cloth presser 7 by the empty loop transfer means 15, and the pressing base portion is held. The pressing portion 71c of 71 and the protruding portion 7 of the presser foot 7
It is sandwiched between 7 and 7 and then sewn into the overhang of the new cloth edge. Moreover, when holding the empty ring, the spring force of the spring 75 against the pressing portion 71c is urged / released by moving the operating member 65 of the third air cylinder 63 up and down, thereby holding the empty ring C. You have left. Therefore, as described in the prior art, since the upper surface of the presser foot is not directly pressed by the rod of the air cylinder to hold the empty ring, the pressing force of the air cylinder is not directly applied in this embodiment, and The pressing force of can be set to a predetermined pressing force. Moreover, the presser foot 7 itself has a presser base (empty ring presser).
Since 71 is rotatably supported, even if the presser foot 7 tilts in the front-rear direction, the presser base 17 can follow the movement of the presser foot 7, and can always reliably hold the empty ring. it can.

In the above embodiment, the spring 7 of the empty ring holding means 17 is
No. 5 uses a member that always applies a spring force to the pressing portion 71c in a direction opposite to the direction in which the air ring C is pressed, but instead, in the direction that normally presses the air ring, that is, the guide groove is narrowed. A spring that biases the spring force in the direction may be used. In this case, the guide ring is opened against the spring force just before the guide ring is introduced into the guide groove to hold the guide ring.

[Effects of the Invention] As described above, according to the present invention, the empty ring is held by the pressing portion that is provided on the upper surface of the cloth presser and is biased by the spring force. The holding force to be held can be easily adjusted by adjusting the spring, and since the urging force of the movable mechanism such as the air cylinder is not directly applied to the cloth presser, the cloth presser can be easily set to the specified pressing force. You can Furthermore, since the hollow presser foot is rotatably supported by the cloth presser and is integral with the cloth presser foot, even if the cloth presser tilts in the front-rear direction, the empty presser foot can follow the movement of the cloth presser foot.
The empty ring can always be held reliably.

[Brief description of drawings]

FIG. 1 is a schematic side view of a sewing machine equipped with an empty ring sewing device according to an embodiment of the present invention, FIG. 2 is a rear view showing the essential parts of the same embodiment, and FIG. FIG. 4 is a plan view showing the periphery, FIG. 4 is a front view of the empty ring holding means of the sewing machine, FIGS. 5 and 6 are schematic side views showing the operation of the apparatus of FIG. 1, and FIG. An enlarged perspective view showing an air ring holding mechanism,
FIG. 8 is an enlarged perspective view for explaining the operation of FIG. 5 ... Needle plate, 7 ... Cloth presser, 9 ... Needle 13 ... Pneumatic ring capture device, 15 ... Pneumatic ring transfer means 17 ... Pneumatic presser drive means, 57 ... Suction tube 57a ... Suction port, 71 ... Pressing base part (Pneumatic ring) Presser foot) 75 ... Spring, 79 ... Guide groove C ... Empty ring

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masahiro Fukushima 9-35 Hotta-dori, Mizuho-ku, Nagoya, Aichi Brother Industry Co., Ltd. (56) Reference JP-A-60-29183 (JP, A) JP Sho 60-29184 (JP, A) JP-A 61-45797 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An empty ring catcher having a cutting knife for sucking an empty ring continuously formed from a cloth end from a suction port and cutting the empty ring sucked into the suction port, and a guide for inserting the empty ring. A cloth presser having a groove formed on the upper surface, and an empty ring transfer means for sucking and catching the empty ring held at the suction port of the empty ring trap by the suction port of the suction pipe and transferring it to the vicinity of the guide groove. An empty ring holding means for separating the empty ring of the suction port transferred by the empty ring transfer means from the suction port to hold the empty ring in the guide groove, wherein the empty ring holding means comprises: An empty ring presser that is rotatably supported on the upper surface side of the cloth presser at its intermediate portion, and that holds an empty ring in the guide groove by its one end and the engaged part of the cloth presser. And the direction of pressing the empty ring against the guide groove or the direction A spring for urging the hollow ring retainer in a direction opposite to the direction, and an actuating member provided opposite to the other end of the blank retainer for pressing or releasing the blank retainer against the spring force. An empty-loop sewing-in device for an overedge sewing machine, comprising: a movable mechanism that holds or separates the empty ring in the guide groove by moving the operating member.