| 摘要 |
PCT No. PCT/GB80/00166 Sec. 371 Date Jun. 10, 1981 Sec. 102(e) Date Jun. 10, 1981 PCT Filed Oct. 15, 1980 PCT Pub. No. WO81/01020 PCT Pub. Date Apr. 16, 1981.In a sewing machine having an upper presser (6), a work feed (8) disposed below and aligned with the upper presser (6), and a work support (9) about the feed mechanism (8), the feed mechanism (8) and the work support (9) are movable in unison to a raised position adjacent the upper presser and into a lowered position in which the feed mechanism is spaced further from the upper presser, the feed mechanism and the work support being resiliently loaded upwardly. In another aspect, a drive for a thread take-up element includes a rotary axially-acting cam (15,23), and a cam follower (24) coupled to the thread take-up element (25,29). In a foot-operable electrical control, primarily for an electrically powered sewing machine, there is a foot-actuatable member (35) carried by a support (33,34) and movable within a range, a locating means (42,43,44) to locate the foot-actuatable member at (and/or to urge it towards) an unconstrained rest position intermediate its range of movement, and respective electrical controls (45,46,47a,47b) operable by the foot-actuatable member (35) as it moves to one side and the other of its rest position.
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