Sewing – Stitch forming – Revolving-hook type
Patent
1977-09-14
1978-10-03
Schroeder, Werner H.
Sewing
Stitch forming
Revolving-hook type
112279, 112277, 112285, 112186, 242 20, 328 69, D05B 5726, D05B 3704, D05B 4500, H03K 1700
Patent
active
041177894
ABSTRACT:
The disclosure relates to the automatic refilling of a bobbin spool, in a lock stitch type sewing machine, in the interval between the loading of work units. After sewing of a predetermined work unit, consisting of a single workpiece, or several workpieces, a premeasured thread length on the bobbin spool is exhausted. While the machine operator places a new work unit in position for sewing, the mechanism of the invention refills the empty bobbin spool, in situ, with a precisely measured length of bobbin thread, drawn from an effectively continuous supply source. The mechanisms provided for this purpose, in and of themselves generally known, are arranged in an improved, simplified and more compact arrangement, suitable for incorporation in a variety of commercial lock stitch type sewing machines available to the trade. In conjunction with the new mechanism, there is provided an advantageous, economically feasible control system for effecting highly precise measurement of the bobbin thread, as it is fed to the bobbin spool during the reloading operation. precise control over the thread length guarantees that there is sufficient thread in the bobbin spool to complete the work unit, while avoiding wastage of thread tails.
REFERENCES:
patent: 3509840 (1970-05-01), Rovin
patent: 3582796 (1971-06-01), Shifflet, Jr.
patent: 3628129 (1971-12-01), Riley
patent: 3628480 (1971-12-01), Van Ness
patent: 3740588 (1973-06-01), Stratton et al.
patent: 3832960 (1974-09-01), Mayer et al.
patent: 4002130 (1977-01-01), Rovin et al.
Levine Lawrence J.
Opuszenski Theodore
Pellicano Joseph
Rovin Herman
Swenson Alan F.
Automatech Industries Inc.
Falik Andrew M.
Schroeder Werner H.
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