JPS6025143B2 - automatic sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sewing machine that automatically sews cloth folded into a bellows shape with a Japanese sewing needle.

Conventionally, as this type of automatic sewing machine, there are various types previously proposed by the present applicant.

In these automatic sewing machines, a concave notch is formed in each tooth width surface of a pair of upper and lower meshing gears that bend the cloth into a bellows shape, and a rectangular rotating wheel that pulls and feeds the cloth. A sewing needle is disposed in the sewing machine, and the sewing needle is inserted into the sewing machine as the bellows-shaped cloth is pushed through a rectangular rotary wheel using meshing gears.

However, in this automatic sewing machine, the needle placed in the concave notch is simply pushed through the fabric by a square rotating wheel, so the sewing needle does not smoothly pierce the fabric and presses the fabric. There is a blind that moves backwards. SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic sewing machine that eliminates such drawbacks and enables stable sewing of cloth.

That is, in the automatic sewing machine according to the present invention, a pair of upper and lower idle rollers press and lock the cloth, and a pair of upper and lower meshing gears bends and feeds the fabric in a bellows shape, and as the fabric is bent and fed, the horizontally arranged sewing needle is moved at a constant speed. The sewing needle is configured to be pushed through by a pushing rear arm that advances and retreats at intervals to pierce the fabric.

This will be explained below based on the illustrated embodiments.

The automatic sewing machine shown in the figure holds cloth A in pinch roller groups 1, 2, and 3.
, 4, while being fed and conveyed in a certain direction by guide rollers 5, 6, a pair of upper and lower idle loafs 7, 8 and meshing gears 9, 10
A cloth A is folded and fed in a snake-like shape between the two and sewn together with a sewing needle 11.

A straight Japanese needle is used as the sewing needle 11, and the needle tip is positioned opposite to the feeding direction of the cloth A. The sewing needle holds a thread B passed through the needle hole so that it can be successively drawn out from the cloth feed direction side as the cloth is sewn. Further, this Z sewing needle 11 is arranged between the pair of upper and lower idle rollers 7, 8 and the meshing gears 9, 10, and has hollow recesses 7a, 8a formed on each circumferential side thereof.
9a and 10a. A sewing needle pushing rear arm 12 is arranged on the needle hole side of the sewing needle 11, and moves forward and backward at regular intervals. This pushing rear arm 12 is inserted into and supported by a fixed bracket piece 13 attached to the fuselage so as to be able to protrude or retract, and a spring 14 is attached to the center line of the rear arm 12.
The rear end side is fixed to the movable bracket 15 via.

The movable bracket 15 is slidably supported via a spring 17 by a guide bar 16 fixed to the fixed bracket side. A kick arm 18 is disposed behind the movable bracket 15 and is pivotally connected to the fuselage, and the kick arm 18 is moved forward at regular intervals by an impeller 19 disposed below, thereby moving the kick arm 18 together with the movable bracket 15. It is purchased so that the pushing rear arm 12 moves forward. Note that the idling rollers 7 and 8 are used to press and lock the cloth that is folded and fed in a bellows shape by the meshing gears 9 and 10 so as not to restore the cloth. It follows the tension and rotates idly. The pinch roller 1, the meshing gear 9, and the impeller 19 are each configured to be rotatable, and the drive mechanism includes a wheel attached to each rotating shaft through which the rotational force of a drive motor 20 is applied via a tension belt 21. 23, 24, and 25 can be adopted. The guide rollers 5 and 6 are used to guide the downward movement of the fabric A on a mechanism in which a pushing rear arm 12 disposed at the same level as the sewing needle 11 is moved by an impeller 19 via a kick arm 18, A guide plate 26 is arranged so that the kick arm 8 can smoothly press the movable bracket 15 against the bale as it swings. In the automatic sewing machine configured in this way, cloth A
is fed from the side where the meshing gears 9 and 10 are arranged, and the thread B is fed into the sewing needle 1.
Insert cloth A into needle hole No. 1 by pulling it out from the delivery side in the opposite direction.

The cloth A is first bent into a bellows shape by the meshing gears 9 and 10 and is pressed and locked by idle rollers 7 and 8 before being restored. During this process, the cloth feeding of the meshing gears 9 and 10 causes the gears 9 to
, 10 and the idling rollers 7, 8, the sewing needle 11 slightly pierces the width cloth A. This needle 11 is pushed out by the pushing rear arm 12 to sew the cloth A at regular intervals, that is, at every protruding interval of the blade plates 19a, 19a, . . . of the impeller 19. In the pushing rear arm 12, the impeller 19 has blade plates 19a, 1
When the kick arm 18 is pressed and swung forward with the assistance of one of 9a..., the cam piece 18 of the kick arm 18
As the movable bracket 15 moves forward at step a, it can project forward from the fixed bracket 13 fixedly attached to the machine body and press the sewing needle 11. Also, press arm 1
2, when the kick arm 18 comes off from the vane plate 19a due to the rotation of the impeller 19, the movable bracket 15 moves backward by the elastic force of the springs 14 and 17 inserted on the axes of the pressing arm 12 and the guide bar 16. By doing this, sewing needle 1
Move back in the direction of releasing the pressure in step 1. From the first repetition of this operation, the fabric A is initially sewn gradually by the feeding of the meshing gears 9 and 10 and moves backward, and then sewn by the pulling and feeding of the pinch roller groups 1, 2, 3, and 4. It will be carried out backwards from the end point. As described above, according to the automatic sewing machine according to the present invention, the piercing and threading operations of the sewing needle are performed by the intermittent forward and backward movements of the pushing rear arm. can do.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing the internal mechanism of an automatic sewing machine according to the present invention, and FIG. 2 is a side view of the same. A... Cloth, 7, 8... Meshing gear, 9, 10
...Idle roller, 11...Sewing needle, 12...
Push rearm. Rudder map N ship

Claims (1)

[Claims] 1 A pair of upper and lower idling rollers are arranged to press and lock the cloth being fed and conveyed in a certain direction, and a pair of upper and lower meshing gears that bend and feed the cloth in a bellows shape are rotated to the front side of the idling rollers in the cloth feeding direction. A hollowed-out recess is formed on each circumferential side of the idling roller and drive gear, and a sewing needle with the needle tip facing the cloth feeding direction is arranged in the recess. A fixed bracket fixed to the frame, a movable bracket provided so as to be movable back and forth in the direction of the fixed bracket along the guide bar, one end fixed to the movable bracket, the other end inserted and supported by the fixed bracket and moved in the backward direction. It has a needle pushing arm biased by a spring and a kick arm that moves forward in the cloth feeding direction at predetermined intervals as the impeller rotates, and the forward movement of the kick arm moves the movable bracket against the spring biasing force. The sewing needle is configured to move the sewing needle forward and backward at predetermined intervals by advancing the pushing arm through the movable bracket and retracting the pushing arm by the repulsive force of the spring through the movable bracket. sewing machine.