Cam unit and sewing machine employing same

Details Cam unit and sewing machine employing same Cam unit and sewing machine employing same

1990-09-18

1991-12-10

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

74569, D05B 2706

Patent

active

050708007

ABSTRACT:
A cam unit comprising a main cam; a first auxiliary cam provided in contact with the main cam; a second auxiliary cam provided in contact with the first auxiliary cam; a rod provided between the main cam and the second auxiliary cam and having a slenderly shaped hole in which the peripheral portion of the first auxiliary cam is located in contact with the rod so that the rod is swung while being guided by the first auxiliary cam; a motion transmission means secured to the rod and located on the peripheral portion of the main cam so as to move the rod in accordance with the contour of the main cam; a jump prevention means secured to the rod and located on the peripheral portion of the second auxiliary cam so as to prevent the motion transmission means from jumping from the main cam; and a shaft extending through all the cams. A positive cam is constituted by the main cam, the auxiliary cams and the rod without guiding a driven member to straightly move it. A motion is directly transmitted to a swinging member by the cam unit.

REFERENCES:
patent: 2704331 (1955-03-01), Stott et al.
patent: 3427888 (1969-02-01), Rheinlander
patent: 4199995 (1980-04-01), Murakami
patent: 4503794 (1985-03-01), Ishihara
patent: 4612867 (1986-09-01), Rosch et al.
patent: 4838114 (1989-06-01), Stidworthy
patent: 4848254 (1989-07-01), Krowatchek et al.

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