JPS5854068Y2 - Cloth feed actuator in hand sewing machine - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a cloth feeding device for a hand sewing machine.

Conventional hand sewing machines are equipped with a cloth feed device, but when the cloth feed dog moves left and right while moving in and out, the backward action is performed before the feed dog is completely retracted from the top of the throat plate, so it is difficult to pull the cloth when retracting. This has the disadvantage of reducing sewing efficiency and causing uneven stitches.

This proposal was made with the aim of eliminating this drawback. To explain this proposal with reference to drawings, 1 is the sewing machine body, 2 is an actuating plate with cloth feed teeth 3 on the upper end, and The aperture 4 is formed so that the opposing hole edges on both sides are vertical, the upper and lower opposing hole edges are sloped sides, and the shape of the aperture is substantially rhombic.

5 is a pin of a required length fixed on the back of one side of the actuating plate at a predetermined position, and the pin 5 is attached to the lower hole edge of a hole cam 7 of a desired shape provided on the fixed frame plate 6 in the main body 1 at the rear. It is kept in constant contact by the action of a tension spring 8 that pulls it downward.

Reference numeral 9 designates an up-and-down operating lever, the front end of which passes through the opening 4 of the operating plate 2 and is fitted into the elongated hole 12 of the operating cam 11 of the looper 10 installed on the front surface of the operating plate 2. The opening edge of the looper is brought into constant contact with the undulating actuating rod 9 by the action of both the looper actuating cam 11 and the tension spring 8 installed on the actuating plate, and the actuating plate 2 is raised and lowered in accordance with the up-and-down movement of the undulating actuating rod. It is designed to perform left and right reciprocating operation.

Note that the reference numeral 13 in the drawings is a control pin of the actuating plate 2.

Since the present invention is configured as described above, the undulating frame plate 14
When the is raised as shown in FIG. 1, the undulating actuating rod 9 stops at the upper end of the opening 4 of the actuating plate 2 as shown in FIG.
The cloth feed dog 3 protrudes above the throat plate, and the pin 5 is stopped at the right end of the hole cam 7.

At this time, when the undulating frame plate 14 is pressed with the thumb and the sewing needle is lowered through the through hole in the throat plate, the undulating operating rod 9 is moved along the left vertical hole edge of the opening 4 in the operating plate 2, as shown in FIG. The undulating actuating rod 9, which descends vertically as it comes into contact with the lower end of the hole 4 when it is lowered, lowers the actuating plate 2 while moving it to the left as shown in FIG. The pin 5 is introduced into the left end concave portion of the hole cam 7, and the cloth feed dog 3 at the upper end is recessed from the upper surface of the throat plate.

When the force of the thumb pressing the undulating frame plate is released, the undulating operating rod 9, together with the undulating frame plate, instantly rises along the right side edge of the opening 4 of the operating plate 2, as shown in FIG. Subsequently, when the operating plate 2 hits the inclined hole edge at the upper end of the opening, the operating plate 2 returns to the state shown in FIG. It is transferred to the right at regular intervals.

During this operation, the actuating plate 2 is moved vertically up and down by the up-and-down actuating rod, and the pin 5 moves the hole edge of the hole 4 along the hole edge of the hole cam 7.
Due to the action of
The feed dog that protrudes above the throat plate, that is, immediately after feeding the fabric, does not retreat when descending, and therefore descends without recessing from above the throat plate, unlike the fabric feed dog in conventional band sewing machines. Therefore, according to the present invention, there is no unevenness of stitches or unnatural occurrence of zero cloth feed as seen in conventional band sewing machines, and there is an effect that the stitches are always sewn correctly with aligned stitches.

[Brief explanation of drawings]

The drawings show the present invention; FIG. 1 is a sectional view of the main body of a band sewing machine implementing the present invention, FIG. 2 is a sectional view taken along line A-A, and FIG. 3 is a front view of the looper operating cam. Fig. 4 is a perspective view of the actuating plate with cloth feeding teeth, Fig. 5 is a perspective view showing the opposite side of Fig. 4, and Figs. 6 to 9 are actuating plates that operate in response to the operation of the up-and-down actuating rod. FIG. 1... Sewing machine body, 2... Operating plate, 3
... Cloth feed dog, 4 ... Opening hole, 5 ...
...Pin, 6...Fixed frame plate, 7...
Hole cam, 8... tension spring, 9... undulation operation rod, 10... looper 11... cam for looper operation.

Claims (1)

[Scope of utility model registration request] An actuating plate 2 having a cloth feeding tooth 3 at its upper end is provided with an aperture 4 forming a slightly rhombic shape with vertical opposing hole edges on both the left and right sides and sloped edges at a required angle as the upper and lower opposing hole edges. A pin 5 of a required length is fixed on the back side at a predetermined position on the side, and a pull spring 8 is attached to the lower hole edge of a hole cam 7 of a desired shape provided on a fixed frame plate 6 in the sewing machine main body 1 at the rear of the pin. A looper 10 is always in contact with the actuating plate 2 and is installed on the front side of the actuating plate through the opening 4 of the actuating plate 2.
The opening edge of the actuating plate is constantly brought into contact with the elevating actuating rod 9 whose tip is fitted into the elongated hole 12 of the actuating cam 11 by the action of both the looper actuating cam 11 and the tension spring 8, A cloth feed actuating device for a hand sewing machine, characterized in that an actuating plate is made to move up and down and reciprocate from side to side in accordance with the up-and-down movement of an actuating rod.