Sewing – Work manipulating – Guides
Patent
1976-08-11
1978-03-07
Schroeder, Werner H.
Sewing
Work manipulating
Guides
D05B 302
Patent
active
040773418
ABSTRACT:
A sewing machine has a shaft which is rotated relative to the machine frame in order vertically to reciprocate a needle and to rotate a pack of pattern cams. Two cam followers are axially displaceable along this pack and are engageable radially with the cams for controlling the stitch pattern of the needle. The sewing machine has a buttonholer which comprises a releasing cam arrangement which is connectable to the pack and to the followers and which is rotatable by the pack from a starting position through predetermined first angular positions so as to displace the followers from an engaged position riding on respective cams into a disengaged position clear of the cams only when the pack is in the first angular positions. A shifter is provided which is connected to the releasing cam arrangement which displaces the followers axially along the pack each time the releasing means displaces the followers from engaged to disengaged position. A stopper disconnects the releasing cam arrangement from the shifter in a predetermined second position which the pack assumes after passing through the first positions. A clearing device is provided for disconnecting the releasing cam arrangement from the pack and returning it to the stopping position, and a setting arrangement is provided having an adjustment element which allows the operation of the releasing cam arrangement as described above or which in inoperative position prevents displacement of the releasing cam arrangement from the starting position.
REFERENCES:
patent: 3149591 (1964-09-01), Aiki et al.
patent: 3754521 (1973-08-01), Thuring
Janome Sewing Machine Co. Ltd.
Nerbun Peter
Schroeder Werner H.
Striker Michael J.
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