JPH0530701Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to an upper looper of an overlock sewing machine that reciprocates diagonally up and down while crossing the motion locus of the sewing machine needle in conjunction with a sewing machine needle that reciprocates in the up and down direction. Regarding.

BACKGROUND OF THE INVENTION An overlock sewing machine is constructed so that an upper looper and a lower looper operate to cross the locus of movement of a sewing machine needle that reciprocates in the vertical direction to form an overlock stitch.

As shown in FIG. 4, the upper looper is attached to the tip of a swinging rod 2 fixed to a swinging shaft 1 that swings in conjunction with the main shaft (not shown) of the sewing machine, through a pivot 4 to rotate around a horizontal axis. The sewing machine needle is attached to the tip of a rotatably provided looper operating shaft 50, and the locus of the tip of the upper looper 60 is guided by a guide member 7 to which the middle of the looper operating shaft 50 is fixed. (not shown)
It moves as shown by the broken line across the motion locus (shown by the dashed line).

The upper looper 60 is attached to the looper operating shaft 50 as shown in FIGS. 5 and 6.
The small-diameter shaft portion 50a at the tip of the upper looper 60 is inserted into a mounting hole 61 formed in the vertical direction at the base end of the upper looper 60, and is provided in the upper looper 60 so as to reach this from the lateral direction of the mounting hole 61. Screw 63 into screw hole 62
The tip of the screw 63 is brought into contact with the small diameter shaft portion 50a and fixed.

Problems to be Solved by the Invention However, in the above-described mounting method of the upper looper, the tip of the screw 63 causes the small diameter shaft portion 50a to
If the upper looper 60 is damaged and becomes concave, for example, in an attempt to change the mounting angle of the upper looper 60 with respect to the looper operating shaft 50, the mounting hole 6 may be turned relative to the small diameter shaft portion 50a and firmly fixed with the screw 63. There was a problem in that the abutting position of the tip of the screw 63 on the small diameter shaft portion 50a changed arbitrarily due to the recess already created by the previous fixation.

Means for Solving the Problems The upper looper of the overlock sewing machine according to the present invention is an overlock sewing machine in which the upper looper of the overlock sewing machine reciprocates diagonally up and down while crossing the movement locus of the sewing machine needle in relation to the sewing machine needle that reciprocates in the up and down direction. In the upper looper, a horizontal support rod is formed on the proximal end side of the upper looper, and a split groove and a horizontal support rod insertion hole connected to the split groove are provided on the distal end side of the looper operating shaft that supports the upper looper. Insert the horizontal support rod of the upper looper into the horizontal support rod insertion hole of a certain gripping part, narrow the gap with the means for narrowing the gap between the split grooves, grip the horizontal support rod with the gripping part, and then It is characterized by a configuration in which the looper is attached to the looper operating shaft.

Function In the present invention, the horizontal support rod of the upper looper is inserted into the horizontal support rod insertion hole of the grip portion on the tip side of the looper operating shaft, and the gap between the split grooves provided in the grip portion is narrowed. Since the gap is narrowed, the horizontal support rod is gripped by the gripping portion, and therefore, even if the installation angle of the upper looper with respect to the looper operating shaft is changed, the upper looper is reliably installed at the changed angle. .

Embodiment One embodiment of the present invention will be described based on FIGS. 1 to 3. Figure 1 is a plan sectional view showing the vicinity of the upper looper of the overlock sewing machine according to the present invention;
The figure is a plan view of the attachment portion of the upper looper, and FIG. 3 is a side view thereof, and numeral 10 in the figure indicates the upper looper. The base end side of the upper looper 10 is attached to the tip of a looper operating shaft 20, and the looper operating shaft 20 includes a swing shaft, a swing rod, a pivot (not shown), and a guide member configured in the same manner as in the conventional art. 7 and the like, and the tip of the upper looper 10 performs a basic operation of reciprocating diagonally up and down across the locus of movement of a sewing machine needle (not shown). Note that 9 in the figure is a lower looper.

At the base end of the upper looper 10, as shown in FIG. 2, a horizontal support rod 11 with a horizontally long circular cross section is formed. The horizontal support rod insertion hole 23 of the grip portion 21 has a split groove 22 and a horizontal support rod insertion hole 23 connected to the split groove 22 . The outer edge of the split groove 22 reaches the surface of the grip part 21 and the inner edge reaches the horizontal support rod insertion hole 23, and both side edges are also opened, so that the direction of both side edges of the split groove 22 is It is inclined slightly clockwise from the center line direction of the horizontal support rod insertion hole 23 in plan view.

A threaded hole 24 is formed in the grip portion 21 so as to intersect with the groove 22 . The screw hole 24 is the split groove 2
A screw is cut on only one side of the hole, and the inner surface of the other side is a circular hole with a larger diameter and is not threaded. A screw 25 is screwed into this screw hole 24 from the other side, and when the screw 25 is tightened, the split groove 2
A force that narrows the gap between the two acts on the gripping part 21,
The horizontal support rod 11 is firmly held in the horizontal support rod insertion hole 23 without the formation of a concave portion as in the conventional case.

The split groove 22 is inserted into the horizontal support rod insertion hole 2 as described above.
The reason why the sewing machine frame 100 is tilted slightly clockwise from the center line direction of 3 is that the sewing machine frame 100 is located directly to the right of the sewing machine from the looper operating shaft 20, so that there is no problem in tightening the screw 25. This is because. Regarding the angle at which the split groove 22 is tilted,
The entire inner edge of the split groove 22 is connected to the horizontal support rod insertion hole 2.
If it is located at position 3, the above-mentioned gripping is possible and can be determined freely.

In addition, when the dividing groove 22 is provided at an angle as in the above embodiment, the upper looper 10 is connected to the suction port 31 of the empty ring suction cutting device 30, as shown in FIG.
This makes it possible to bring the positions closer together, which is convenient for adjusting the size of the empty ring, especially for shortening it.

Effects of the Invention As detailed above, in the case of the present invention, the horizontal support rod of the upper looper is inserted into the horizontal support rod insertion hole of the grip portion on the tip side of the looper operating shaft, and the gap between the split grooves provided in the grip portion is Since the gap is narrowed by the means for narrowing the horizontal support rod, the horizontal support rod is held by the gripping portion, and therefore, even if the installation angle of the upper looper with respect to the looper operating shaft is changed, the upper looper is reliably held at the changed angle. As a result, an excellent effect can be achieved in that the change in fixing position due to the formation of a recess, which has been a problem in the past, can be resolved.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view showing the vicinity of the upper looper according to the present invention for an overlock sewing machine, Fig. 2 is a plan view of the attachment part of the upper looper, Fig. 3 is a side view thereof, and Fig. 4 is a conventional upper looper. FIG. 5 is a front view of the looper, FIG. 5 is a sectional view taken along the - line in FIG. 4, and FIG. 6 is a perspective view of the upper looper. 7... Guide member, 10... Upper looper, 11...
Horizontal support rod, 20... Looper operating shaft, 21... Gripping portion, 22... Division groove, 23... Horizontal support rod insertion hole, 24... Screw hole, 25... Screw.

Claims (1)

[Scope of claims for utility model registration] (1) In connection with a sewing machine needle that reciprocates in the vertical direction,
In the upper looper of the overlock sewing machine, which reciprocates obliquely up and down while crossing the motion locus of the sewing machine needle, a horizontal support rod is formed at the base end side of the upper looper, and at the tip side of the looper operating shaft that supports the upper looper. , by inserting the horizontal support rod of the upper looper into the horizontal support rod insertion hole of the gripping part, which is provided with a split groove and a horizontal support rod insertion hole connected to the split groove, and narrowing the gap between the split grooves. An upper looper for an overlock sewing machine, characterized in that the gap is narrowed, the horizontal holding bar is gripped by a gripping part, and the upper looper is attached to a looper operating shaft. (2) In conjunction with the sewing machine needle that reciprocates in the vertical direction,
In the upper looper of the overlock sewing machine, which reciprocates diagonally up and down while crossing the locus of movement of the sewing machine needle, a horizontal support rod is formed at the base end of the upper looper and projects in the fabric feed direction of the sewing machine, and this horizontal support rod is formed on the base end side of the upper looper. A horizontal support rod insertion hole into which the rod is fitted in a position-adjustable manner is drilled near the tip of the looper operating shaft that supports the upper looper in the direction of cloth feeding, and the insertion hole leads to the tip of the looper operating shaft. With the split groove inclined with respect to the cloth feeding direction and the horizontal support rod inserted into the insertion hole from the front side, insert a screw from the front side of the sewing machine that intersects the longitudinal direction of the split groove to the tip of the looper operating shaft. An upper looper of an overlock sewing machine, characterized in that the upper looper is screwed in such a way that it can be freely inserted and removed, and the upper looper is attached to a looper operating shaft.