JPS625384A - Empty link stitching apparatus of two-needle overlock sewingmachine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an empty chain sewing device for a two-needle overlock sewing machine.

[Conventional technology]

-a, when overlock stitching is performed on the edge of the fabric using an overlock sewing machine, when the sewing is completed, an empty ring is created that continues on the fabric'.

For this reason, in overlock sewing machines, an empty ring holding/cutting device is usually installed in front of the needle drop section, and when sewing is completed, the operator brings the empty ring connected to the fabric to the front side. It is hung on a holding/cutting device to hold it and cut it from the fabric.

In this way, the empty ring held by the empty ring holding/cutting device is automatically sewn into the seam of the fabric to be sewn next, thereby preventing the seam from fraying at the beginning of sewing.

By the way, there are 2 needles on the throat plate of a 2-needle overlock sewing machine.
In order to prevent the work cloth from sinking into the needle groove or skipping stitches when sewing with a regular needle, and to maintain the texture of the sewn product by making the N stitches plump, the middle nail is set as shown in Figure 1. It is normal that it is provided. l is the throat plate, 2 is the middle claw, 3
8 indicates the outer claw, and 8 indicates the feed dog groove.

However, after completing the 1M production, when the operator brings the empty ring connected to the fabric to the front side and hooks it to an empty ring holder etc. to hold it (so-called pack tuck), the empty ring is pulled by the middle claw. This not only makes it impossible to carry out the pack-tuck operation smoothly, but also often impedes the smooth sewing of the formed hollow ring into the next fabric.

Therefore, in order to solve the above problem, the inner claw can be retracted toward the front from a position parallel to the outer claw, and the inner claw is configured to be held in the retracted position when not sewing. A built-in device is provided.

However, in such a conventional empty ring sewing device, in order to enable the middle claw to retreat properly, a drive mechanism is provided, which is constituted by a rotary solenoid, etc., and a mechanism is installed between the drive mechanism and the middle claw. An interposed slide lever, a control device for the drive mechanism, etc. are required.

[Problem that the invention seeks to solve]

Since the conventional empty ring sewing device requires the above-mentioned configuration,
As the number of parts increases and the structure becomes more complex, problems such as malfunctions, difficulty in maintenance services, and increased cost arise.

[Means for solving problems]

In this invention, when the empty ring is rotated and held toward the operator side, the empty ring guide means provided at the end of the outer pawl is brought into contact with the end on the throat plate side during so-called pack-tuck, and the empty ring is guided to the end of the outer pawl. This is an attempt to solve the above problem by engaging them.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 2 to 5.

In the figure, 1 is the throat plate, 2 is the middle claw, 3 is the outer claw parallel to the outside of the middle claw 2, 4 is the empty ring guide means provided at the tip of the outer claw 3, and 5 is the front side of the throat plate l. This is an empty ring holding/cutting device installed at the end (on the operator side). As shown in FIG. 2, the empty ring guide means 4 has an oval lever rotatably attached to the throat plate 1 side at the tip of the outer claw 3, and the tip of the lever is normally rotated by a spring means. It is configured to abut against the side end of the throat plate l facing the inside of the outer claw 3. This will be explained in more detail with reference to FIG. In this embodiment, the left half of the tip of the outer claw 3 is cut out, and a lever serving as the empty ring guide means 4 is located here. That is, on the outer claw 3 at the lower part of the notch part, there is a recess 4 as a joint part for the lever (empty ring guide means) 4.
a is formed. Since the lever 4 rotates to the left, the upper and left sides of the recess 4a are flush with the bottom surface.

Further, 4b in FIG. 1 is a spring means provided on the outer claw 3 that normally biases the lever 4 so that its tip comes into contact with the side end of the throat plate 1 facing the inside of the outer claw 3. . The biasing force of the spring means 4b is such that when no load is applied, the tip of the lever 4 comes into contact with the side end of the throat plate l, and when an empty ring is formed on the outer pawl 3, the compressive force causes the lever 4 to move. It is necessary that it be in a closed state. (See FIG. 4) The following operation will be explained based on the above configuration. First, when the outer pawl 3 does not have an empty ring, the lever (empty ring guide means) 4 is brought into contact with the end of the lever (empty ring guide means) 4 by the spring means 4b against the end of the throat plate 1 on the side opposite to the outer pawl 3. There is.

Next, when the sewing machine is driven and the thread starts to engage with the outer claw 3, the lever (empty ring guide means) 4 is pulled in the direction of the outer claw 3 by the binding force against the spring pressure, and the thread starts to engage with the outer claw 3. Join with 3. (See Fig. 4) When the sewing is completed and the fabric is stretched in the direction of movement and at the same time the hollow ring formed on the outer claw 3 is pulled out, the lever (air ring guiding means) 4 is automatically activated by the spring bias. Returns to the original position, that is, the position where the tip moves to the left in FIG. 4 and abuts the side edge of the throat plate 1,
The opening to the middle claw 2 is closed. (See Figure 5) Next, when the fabric and the ring A connected thereto are brought to the operator's side, the ring A is guided by the outer surface of the lever (ring guide means) 4 which is tilted. It very smoothly engages with the tip of the outer claw 3, and the front end of the hollow ring A is clamped at the same time as cutting by the hollow ring holding/cutting device 5. (See Figure 5) [Effects of the Invention] With the configuration described above, the present invention automatically closes the opening to the middle claw when necessary, without the operator's particular intention, thereby achieving a smooth empty ring. In addition to being able to carry out rotary work, the structure is simple and the number of parts is small, so the operational reliability is high and the cost can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example of a throat plate in the prior art, FIG. 2 is an explanatory diagram of an empty ring guide means in the present invention, and FIG.
FIG. 4 is an explanatory view showing a state in which the hollow ring has closed the hollow ring guide means; FIG. 5 is an explanatory view showing the state in which the hollow ring is held after sewing is completed.

Claims (1)

[Claims] An empty ring holding/cutting device is provided on the front side of the needle drop part, and an empty ring guiding means is provided at the tip of the outer claw parallel to the inner claw,
After sewing is completed, the fabric is stretched in the direction of movement and the empty ring connected to the fabric is removed from the outer claw, and at the same time the guide means rotates to create an opening between the outer claw side end and the throat plate side end opposite thereto. Empty ring sewing of a two-needle overlock sewing machine, characterized in that the empty ring is closed and the empty ring is guided when it is stretched toward the front so that the empty ring engages with the tip of the outer claw. Device.