Sewing – Special machines – Darning
Patent
1989-06-05
1992-01-21
Schroeder, Werner H.
Sewing
Special machines
Darning
112152, 112305, D05B 3506
Patent
active
050819453
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement of a sewing machine to sew an elastic tape to a fabric.
2. Description of the Prior Art
A generally known elastic tape sewing machine is adapted to place a sewing portion of an elongated elastic tape to be sewn on a fabric, to retain the combined body of the elastic tape and the fabric between feed teeth and a presser foot opposed to the feed teeth, to feed the combined body by the feed teeth and to sew the elastic tape by a sewing needle to the fabric. In this case, the elastic tape is supplied from a tape winding bobbin through a through hole in the presser foot to space between the feed teeth and the presser foot.
Conventionally, in such a sewing machine, the elastic tape to be sewn is fed to have suitable tension on the fabric. Thus, in the course of the elastic tape from the bobbin to the presser foot, the elastic tape is passed between a pair of retaining members pressing the elastic tape. The retaining members are adapted to press the elastic tape by urging a movable retaining member onto a fixed retaining member by the force of a spring.
However, such retaining members can not adjust the force of the spring automatically and precisely. To apply suitable tension to the elastic tape, an adjusting screw may be manually turned on the fixed retaining member to compress the spring inserted between the movable retaining member and the adjusting screw so as to adjust the spring force. That is troublesome and time consuming problem.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an elastic tape sewing machine which has a mechanism to regulate the spring force of a spring means automatically in order to apply suitable tension to the elastic tape.
To attain the above mentioned object, an elastic tape sewing machine includes feed teeth for feeding a combined body of a fabric and an elastic tape, a sewing needle sewing the elastic tape onto the fabric, a presser foot including an elastic tape through hole and movable to and from said feed teeth to hold the combined body of the fabric and the elastic tape with the feed teeth, a supply device including a retaining means retaining the elastic tape utilizing spring force of an elastic body and feeding the elastic tape through the elastic tape through hole to one side of the presser foot opposing the feed teeth, a guide device guiding the elastic tape fed from the supply device to sewing-ready position between the presser foot and the feed teeth, and a cutting device to cut the elastic tape, characterized by said retaining means including a regulating apparatus formed by a regulating mechanism having a motor rotating predetermined angle set by electric signal to regulate the spring force of the elastic body and a controller controlling the rotation angle of the motor.
Accordingly, by controlling the rotation angle of the motor by the controller, the spring force of the spring body, i.e., elastic tape retaining force of the elastic body, can be precisely regulated so that conventional troublesome manual adjustment is completely eliminated, and suitable tension can be applied to the elastic tape now to be used.
The motor of the regulating apparatus may preferably be a stepper motor. For example, a pulse motor or inclemental motor can be used as the motor for regulating apparatus.
According to other features of the present invention, an elastic tape sewing machine having feed teeth feeding a combined body of a fabric and an elastic tape, a sewing needle sewing the elastic tape onto the fabric, a presser foot including an elastic tape through-hole and movable to and from said feed teeth to hold the combined body of the fabric and the elastic tape with the feed teeth, a supply device including a retaining means retaining the elastic tape utilizing the spring force of an elastic body and feeding the elastic tape through the elastic tape through-hole to one side of the presser foot opposing the feed teeth, a guide device guiding the elastic
REFERENCES:
patent: 2907289 (1959-10-01), Fernandez
patent: 4024824 (1977-05-01), Haff, Jr.
patent: 4281608 (1981-08-01), Mitani et al.
patent: 4635575 (1987-01-01), Schips
patent: 4649839 (1987-03-01), Schneckenburger
Juki Corporation
Lewis Paul C.
Schroeder Werner H.
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