Sewing – Stitch forming – Overseaming
Patent
1988-06-15
1989-12-05
Reynolds, Wm. Carter
Sewing
Stitch forming
Overseaming
112199, D05B 120, D05B 5706
Patent
active
048845183
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an overcasting attachment for use with a sewing machine.
BACKGROUND ART
A prior art overcasting attachment for use with a sewing machine is disclosed in U.S. Pat. No. 4,546,715 to the inventor of the present invention, in which the vertical movement of a needle bar of the straight stitch sewing machine is transmitted to a swing lever to be converted into a swinging movement in a horizontal plane, and the movement of the swing lever causes an upper cross thread guide lever and a lower cross thread guide lever to move relatively longitudinally toward and away from a needle through pins movable along corresponding profiled cam slots formed in the swing lever, so that a predetermined thread-engaging operation may be performed to the needle thread and bobbin thread for straight stitching. ln forming overcasting stitches, the above process further includes a step of engaging an upper cross thread with a lower cross thread. According to the above patent, while the upper cross thread guide lever is moved substantially in a horizontal plane, the lower cross thread guide lever is swung from up to down to once engage the lower cross thread with the upper cross thread guide lever, and then the upper cross thread guide lever is moved ahead of the lower cross thread guide lever to complete the overcasting stitches. Therefore, the lower cross thread guide lever is required to be swung laterally as well as to be moved vertically at the distal end thereof, and such vertical movement is effected by providing a guide member having a vertical guide slot and by engaging a pin provided at the distal end of the lower cross thread guide lever with the guide slot.
However, in such a construction, the profiled slots and the guide slot are used to impart the predetermined movements on the upper cross thread guide lever and the lower cross thread guide lever. This tends to increase vibration and noise to be generated during movement of the pins in the slots as well as complexity of the construction, so that improvement in this field has been desired.
OBJECT OF THE INVENTION
The primary object of the present invention is to provide an overcasting attachment for use with a sewing machine in which no complicated guide mechanism such as profiled slots is required.
Another object of the present invention is to provide an overcasting attachment for use with a sewing machine in which the noise generated by movement of pins along slots is minimized.
A further object of the present invention is to provide an overcasting attachment for use with a sewing machine which is simple in construction and reliable in operation.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided an overcasting attachment for use with a sewing machine having a presser bar, a needle bar provided with a needle, and a feed dog, comprising a base plate; a mounting fixture for removably securing the base plate to the presser bar of the sewing machine; a needle bar interlocking mechanism mounted on a portion of the base plate and movable in operative association with the needle bar; an upper cross thread guide lever and a lower cross thread guide lever both supported on the base plate and carrying an upper cross thread and a lower cross thread, respectively, at the respective distal ends thereof; a cross thread guide lever driving mechanism operatively connected to the needle bar interlocking mechanism for transmitting the movement of the needle bar interlocking mechanism to the upper and lower thread guide levers in a manner such that the upper and lower thread guide levers may engage the upper and lower cross threads with a needle thread and a bobbin thread for straight stitching, respectively, in timed relation to the time when the needle passes through a cloth to be sewn and may engage the upper and lower cross threads with each other at a suitable time before the needle passes through the cloth to be sewn; a cloth-pressing member secured to the base plate for pressing the edge of the
REFERENCES:
patent: 1989919 (1935-02-01), Everitt
patent: 4516512 (1985-05-01), Bernstein et al.
patent: 4546715 (1985-10-01), Mori
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