JPH0230277B2 - 2PPONBARIOOBAAROTSUKUMISHINNOSORAWANUIKOMISOCHI - Google Patents

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.

[Prior Art] Generally, when overlocking the edge of a fabric with an overlock sewing machine, when the sewing is completed, an empty loop is created that is connected to 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 ring 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, the throat plate of a two-needle overlock sewing machine is designed to prevent the work cloth from sinking into the needle groove or skipping stitches when sewing with two needles, and to make the seams plump so that the sewing product can be sewn. In order to maintain the texture, a middle claw is usually provided as shown in Figure 1. 1 is the throat plate, 2 is the middle claw, 3 is the outer claw, and 8 is the feed dog groove.

However, after sewing is completed, when the operator brings the empty ring connected to the fabric to the front side and hooks it to an empty ring holder or the like to hold it (so-called back-tuck), the empty ring is pulled by the middle claw. This not only makes it impossible to perform the back-tuck operation smoothly, but also often interferes with 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 the case of such a conventional hollow ring sewing device, in order to enable the inner claw to retreat properly, a drive mechanism constituted by a rotary solenoid or the like is provided between the drive mechanism and the inner claw. An interposed slide lever, a control device for the drive mechanism, etc. are required.

[Problem that the invention seeks to solve]

Conventional empty ring sewing devices require the above-mentioned configuration, which increases the number of parts and complicates the structure.
Problems such as occurrence of malfunctions, difficulty in maintenance services, and increase in cost arise.

[Means for solving problems]

This invention attempts to solve the above-mentioned problems by configuring the inner claw to be movable back and forth, and using a manual operation mechanism to move it back from a position parallel to the outer claw when backing up the empty ring. be.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 2 to 6.

FIG. 2 is a rear view of the throat plate in the device according to the present invention, in which 1 indicates the throat plate, 2 indicates the inner claw, 3 indicates the outer claw, and 4 indicates the manual operation mechanism. The middle claw 2 is configured to fit into a middle claw slide groove 2a and move in the groove 2a by a manual operating mechanism 4, so that the tip portion can be retracted and retracted.

FIG. 3 is a plan view of the throat plate 1, in which 2b shows the middle claw slide groove formed on the surface of the throat plate 1, and the middle claw 2
is moved back and forth in the slide groove 2b by the manual operation mechanism 4, and its end is moved back from the parallel position with the outer claw 3 as required.

FIG. 4 is a perspective view showing a state in which the manual operation mechanism 4 is attached to the back side of the throat plate 1.

As shown in the figure, the manual operation mechanism 4 includes a rotating body 5 having a rotor 5b connected to the terminal end of the inner claw 2, and an empty ring guide lever 6 pivoted to the side end of the throat plate 1.
and a spring means (not shown) that biases the empty ring guide lever 6 in a counterclockwise direction around the shaft attachment portion. The rotating body 5 is pivotally attached to the back surface of the throat plate 1 by a rotating shaft 9, and has a holding portion 5a at its lower part that is in clamping and sliding contact with a protrusion 6a provided at the lower end of the empty ring guide lever 6. have.

FIG. 5 is a diagram showing how the manual operation mechanism 4 is attached to the side end of the throat plate 1. As shown in FIG. A shows an empty ring that continues on the fabric after sewing is completed.

FIG. 6 shows the state in which the empty ring A is held in the empty ring holding/cutting device 7 after sewing is completed. In addition, N ₁
and N ₂ each indicate two sewing needles (needle drop points).

Next, the operation of the apparatus having the above structure will be explained with reference to FIGS. 3 to 6.

As shown in FIG. 3, the inner claw 2 normally has its end protruding from the throat plate 1 and is in a position parallel to the outer claw 3.

That is, in FIG. 4, the left end of the empty ring guide lever 6 is normally pushed downward at the arrow mark A by the bias of a spring (not shown). (Explaining this with reference to FIG. 5, the right end of the empty ring guide lever 6 is urged upward by the β arrow, and the right shoulder of this empty ring guide lever normally protrudes slightly from the throat plate 1. ) As a result, the protrusion 6a of the empty ring guide lever 6 is
Since the rotating body 5 is normally biased to the left at the arrow B and similarly presses the holding portion 5a to the left at the arrow B, the rotating body 5 is biased to rotate clockwise.

Therefore, the rotator 5b rotates to the left at arrow C, and the middle claw 2 is also pushed to the left at arrow C, so that the tip of the middle claw 2 protrudes from the throat plate 1. , are parallel to the outer claw 3.

When the sewing work is finished, the empty ring connected to the fabric is brought to the front side and engaged with the empty ring holding/cutting device, but at this time, the empty ring A is aligned with the arrow as shown in At mark α, it moves to the right while sliding on the upper end surface of the empty ring guide lever 6, and moves to the empty ring holding state while pushing down the right shoulder of the empty ring guide lever 6 that protrudes from the throat plate 1.

During this process, the right shoulder of the empty ring guide lever 6 is pushed down. That is, when the right shoulder portion rotates downward against the bias of a spring (not shown) at the β arrow mark, the manual operation mechanism 4 performs an operation opposite to that described above.
The inner pawl 2 is retracted and sunk into the throat plate 1, and the empty ring A can be smoothly held in the holding state as shown in FIG.

〔Effect of the invention〕

With the above-described configuration, this invention allows the middle claw to be automatically retracted when necessary without the operator's particular intention, and smooth work can be achieved. The operational reliability is high, and the cost can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of the throat plate in a conventional device, Fig. 2 is a rear view of the throat plate according to the present invention, Fig. 3 is a plan view of the same, and Fig. 4 is a diagram of the manual operation mechanism. FIG. 5 is an explanatory perspective view showing the relationship between the throat plate and the empty ring guide lever, and FIG. 6 is an explanatory view showing the holding state of the empty ring. 1... Throat plate, 2... Middle claw, 3... Outer claw, 4...
Manual operation mechanism, 7... Empty ring holding and cutting device, A...
Empty ring.

Claims (1)

[Scope of Claims] 1. In a two-needle overlock sewing machine equipped with an outer claw 3 formed on the throat plate 1 and an empty ring holding/cutting device disposed in front of the needle drop section, a needle parallel to the outer claw 3 is provided. A middle claw 2 is provided to be slidable on the plate, and a hollow ring guide lever 6 is rotatable about an axis parallel to the cloth feeding direction with respect to the throat plate and has an upper end surface.
and a spring that acts on the empty ring guide lever 6, the upper end surface of which causes the empty ring A to project onto the movement path of the empty ring thread A that engages the empty ring holding and cutting device, and a spring that rotates around the vertical axis. A rotating body 5 which is movable and connected to the inner claw 2 and the empty ring guide lever 6 is used to move the empty ring A to the empty ring guide lever 6 when the empty ring A is engaged with the empty ring holding/cutting device. A two-needle overlock sewing machine characterized in that the hollow ring guide lever 6 is rotated by engaging with the upper end surface, and the inner claw 2 is moved back from the parallel position with the outer claw 3 toward the front by this rotation. Empty ring sewing device.