JPS5921749Y2 - Sewing machine throat plate attachment/detachment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a throat plate attaching/detaching device for fixing the throat plate to the upper surface of the bed or removing it from the upper surface of the bed.

Conventionally, in a sewing machine, as shown in Fig. 1, the throat plate 2 is fixed to the bed 1 with screws 2b, and can be removed from the bed 1 by loosening the screws 2b when necessary, such as cleaning or adjusting the hook. The sliding plate 3 is a guide groove 1 formed in the bed 1.
b, so that it can slide in the left and right direction (Fig. 1),
When necessary, such as replacing the bobbin, it can be removed from the bed 1 by sliding it to the left.

However, when attaching and detaching the throat plate 2, since the head 4 of the sewing machine is close to the top of the throat plate 2, the screwdriver must be applied to the throat plate 2 from an oblique direction. It is difficult to engage the tip of the driver, especially for industrial sewing machines where sewing work is frequent and it is necessary to remove lint etc. that adheres to the hook on a daily basis.
In this case, attaching and detaching the throat plate 2 was troublesome, and work efficiency was significantly reduced.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the prior art by making it easy to attach and detach the throat plate with a simple structure without fixing with screws.

Hereinafter, the same parts as in FIG. 1 are given the same numbers, and an embodiment of this invention will be explained with reference to the drawings. In FIG. A leaf spring 5 fitted and slidable is attached with a screw in a direction perpendicular to the sliding direction of the sliding plate 3 along the guide groove 1a, and a U-shaped engagement part 6a is formed at the tip. The mating piece 6 is attached with a screw so that the tip protrudes in the sliding direction on the throat plate side.

In addition, as shown in Fig. 3.4, the throat plate 2 on the top surface of the bed 1 is
A protrusion 1b is formed at the position where the needle plate 2 is to be placed, and a recess 2b is formed on the lower surface of the throat plate 2 so as to be able to engage with the protrusion 2b.

Further, on the lower surface of the throat plate 2, when sliding the sliding plate 3 to the right (FIG. 3) along the guide groove 1a of the bed 1,
A step screw 7 having a step bulging horizontally from the central axis is screwed onto the entry path of the retaining piece 6, and is engaged in the gap between the head of the step screw 7 and the lower surface of the throat plate 2. The engaging portion 6a of the piece 6 is brought into engagement.

In the above configuration, when fixing the throat plate 2 on the bed 1, the throat plate 2 is first placed on the bed 1 so that the protrusion 1b and the recess 2b are engaged, and then the throat plate 2 is fixed on the bed 1. is prevented from moving in the horizontal direction, and positioning is performed.

Next, fit the plate spring 5 of the sliding plate 3 into the guide groove 1a of the bed 1 so that the protruding side of the retaining piece 6 is on the right side (Fig. 3), and then insert the sliding plate 3 into the engaging piece. The engaging portion 6a of 6 is connected to the throat plate 2.
Slide the needle plate 2 to the right until it engages with the gap between the lower surface and the head of the step screw 7. This prevents the needle plate 2 from moving in the vertical direction, and the protrusion 1b of the bed 1 and the throat plate The needle plate 2 is fixed to the upper surface of the bed 1 in cooperation with the recess 2b of the needle plate 2 (FIG. 3).

When removing the throat plate 2 from the top surface of the bed 1, the fourth
As shown in the figure, by sliding the sliding plate 3 in the direction of arrow A until the engaging portion 6a of the engaging piece 6 comes off from between the lower surface of the throat plate 2 and the head of the stepped screw 7, the throat plate 2 is released from the vertical direction, and the throat plate 1 can be removed from the bed 1 by lifting it by hand in the direction of arrow B.

As described above, this invention has the stepped screw 7 screwed onto the lower surface of the throat plate 2 without fixing the throat plate to the bed 1 with screws.
The throat plate is fixed to the bed 1 by engagement with the engagement piece 6 which is fixed to the lower surface of the sliding plate 3 and can be secured between the step screw 7 and the lower surface of the throat plate 2. By simply moving the sliding plate 3 in one direction or the other along the guide groove 1a of the bed 1, the needle plate 2 can be attached to and removed from the bed surface very easily without resisting the acting force of a spring or the like. Especially in industrial sewing machines, cleaning and adjustment of the hook becomes easier and workability is significantly improved.

In the above embodiment, a single stepped screw 7 is used to engage the retaining piece 6, but due to the need for strength, stability, etc. for fixing the throat plate 2, a plurality of stepped screws 7 are used. There may also be a plurality of retaining pieces 6 to be engaged.

Further, in the above embodiment, the retaining piece 6 is fixed to the sliding plate 3,
Although the step screw 7 is fixed to the throat plate 2, it is also possible to fix the step screw 7 to the sliding plate 3, fix the engagement piece 6 to the throat plate 2, and make them engage. good.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional throat plate fixed to the bed, Figure 2 is a view of the throat plate and slide plate of the present invention viewed from below, and Figure 3 is a diagram showing the throat plate and slide plate of the present invention. Fig. 2 is a cross-sectional view taken along line X-X in the state in which the slide plate is engaged, and Fig. 4 is a cross-sectional view taken in the line X-X in Fig. 2 with the sliding plate disengaged from the throat plate. .

Claims (1)

[Scope of Claim for Utility Model Registration] A throat plate 2 having a convex or concave portion 2b formed at the lower end, an opening 1a facing the sewing machine stitching part and having both edges parallel to each other, and a throat plate continuous with the opening. A bed 1 is formed with a fitting part for fitting, and a recess or a protrusion 1b is formed in the fitting part so as to be able to engage with a protrusion of the throat plate 2; A sliding plate 3 supported so as to be slidable so as to be locked vertically along the surface, a central axis projecting downward from the throat plate 2, and a protruding body 7 having a stepped portion protruding horizontally from the central axis. and is fixed to the lower surface of the sliding plate, and engages between the stepped portion of the protruding body 7 and the lower surface of the throat plate so as to prevent the upward movement of the throat plate by sliding the sliding plate close to the throat plate. A retaining piece 6 having a notch 6a and allowing the throat plate to be removed from the bed by being removed from the step of the protruding body 7 by sliding the sliding plate away from the throat plate. .