Claims
- 1. A thread feeding apparatus for a sewing machine which feeds a thread to a stitch forming device for stitch forming on a cloth, said thread feeding apparatus comprising:
- an upstream gripper for gripping the thread fed from a thread spool, said upstream gripper comprising a pair of grip plates biased together by a compression spring, said upstream gripper being closed by said stitch forming device at a time of forming the stitch and opened at a time of feeding of the cloth;
- a downstream gripper for gripping the thread introduced from said upstream gripper and comprising a pair of grip plates biased together by a compression spring, said downstream gripper being open at the time of forming the stitch to allow the thread to be pulled by said stitch forming device and being closed at the time of feeding of the cloth; and
- a reciprocator synchronously driven with said stitch forming device to shift the thread from a thread path extending between said open upstream gripper and said closed downstream gripper at the time of feeding of the cloth to provide a thread quantity necessary for one stitch and to release the thread at the time of forming the stitch;
- said reciprocator being disposed between a pair of thread guides arranged between said upstream gripper and said downstream gripper and spaced in direction of feed of the thread.
- 2. A thread feeding apparatus for a sewing machine as recited in claim 1, wherein said reciprocator has a sloped surface for receiving the thread from an inlet port and for guiding the received thread to a point in the thread path aligning with said pair of thread guides.
- 3. A thread feeding apparatus for a sewing machine as recited in claim 1, further comprising a shifter for adjusting extent of the shifts from the thread paths by said reciprocator and the corresponding thread quantity, responsive to changes in stitch width, stitch length and/or cloth thickness.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-81388 |
Mar 1997 |
JPX |
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CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of U.S. Ser. No. 08/972,263, filed Nov. 18, 1997, allowed as U.S. Pat. No. 5,934,211.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1652407 |
May 1991 |
RUX |
Continuations (1)
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Number |
Date |
Country |
Parent |
972263 |
Nov 1997 |
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