Sewing – Stitch forming – Chain or double chain
Patent
1997-05-22
2000-08-01
Izaguirre, Ismael
Sewing
Stitch forming
Chain or double chain
112254, D05B 110, D05B 5704, D05B 4700
Patent
active
060950692
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to manufacture of equipment for sewing, sewing industry, knitted goods industry, leather industry, and shoe industry, in particular shoe double-thread chain-stitch sewing machines.
A sewing machine is known which makes a double-thread stitch line of the type 401 (see Reibarkh L. B., Reibarkh L. P., Dremalin N. A. "Sewing Machines for Knitting & Textile Industry", M., "Legprombitizdat", 1989, pages 33-56), which is formed with a needle and one looper with needles in them, in which the looper performs a complicated spacial movement including an oscillating movement transversely to the line of stitch in a vertical plane and a reciprocating movement along the line of stitch in a horizontal plane.
The formation of a stitch is performed in the following sequence. A needle with a top thread pierces through a material and passes through it a loop of the top thread. During lifting of the needle from its extreme lower position above its ear a loop-overlap of the top thread is formed, and the looper is inserted with its nose into the loop-overlap during its oscillating movement through the left in the vertical plane. The loop engages the top thread. During a further movement through the left, the loop expands the loop of the top thread, introduces into it a loop of the bottom thread and deviates in a direction, which is opposite to the direction of movement of the material, by a value which insures the position of the looper before the needle. The needle lifts and leaves the loop of the top thread on the looper, it exits the material and starts lowering when it reaches an extreme top position. During the location of the needle outside the material, the material is displaced by the value of the stitch. The needle during a second lowering pierces the material and passes the loop of the top needle through it. At this time the looper must start its movement to the right so that on the one hand it provides the positioning of the loop of the top thread fitted on it at the right side of the needle, and at the other end the lower thread of the looper remains still at the left side of the needle. Therefore under the needle a kind of a triangle with an apex in the point of the preceding piercing end sides composed of the top needle, lower needle and the body of the looper is formed. The needle must reach (pierce) in the area of this triangle, since otherwise the stitch is missing. After piercing the needle continuous lowering and passes the loop of the top needle through the loop of the bottom needle. The looper during the movement to the right throws the loop of the top thread to the lower thread of the looper. The loop of the top thread which is thrown from the looper is reduced by a lowering needle, and a preliminary tightening of the stitch by the needle is performed, while the looper continues its movement to the extreme right position and deviates also in direction of movement of the material. The needle reaches its extreme bottom position, and then lifts so as to form a loop-overlap of the upper thread, and the looper engages it during movement. The final tightening of the stitches performed by joint action of the looper and mechanism of movement of the material.
In the above mentioned machine, the mechanism of the looper is complicated in the sense of construction, and also the stability of operation of the machine requires a great area of the triangle, which depends from manufactures. Moreover, the formation of the stitch, or in other words weaving by the top and bottom threads though occurs over one revolution of the main shaft, but the final tightening of the stitch is performed not immediately, but at the second-third cycle depending on a thickness, physics-mechanical properties of the material, a pitch of the stitch and required value of tightening of the stitch with the participation of practically all working units of the machine. The produced stitch is easily unraveled from the end under a relatively low load applied to the bottom thread, which negatively affec
REFERENCES:
patent: 1327232 (1920-01-01), Gatchell
patent: 4169422 (1979-10-01), Hayes et al.
patent: 5233936 (1993-08-01), Bellio
patent: 5487347 (1996-01-01), Kogawara
Izaguirre Ismael
Zborovsky Ilya
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