US 4,065,043 AGranted

Rotary speed minute regulating device for output shaft in puller apparatus

OwnerKatsuji Ohashiinventor

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Abstract

For use with a sewing machine, a cloth pulling apparatus has a rotatable input shaft for coupling to a rotary drive force, and a pair of output shafts provided with cloth-pulling rotors mounted so as to feed cloth through a nip between the rotors. A variable transmission means converts the rotary movement of the input shaft to intermittent unidirectional opposite rotation of the cloth-pulling rotors. The transmission means comprises an eccentric rod pivotally mounted at one of its ends on the input shaft such that rotation of the input shaft effects oscillation of the other end of the rod. A one-way drive member is coupled to the output shafts such that oscillatory movement of the one-way drive member effects intermittent unidirectonal opposite rotation of the output shafts. A linkage effects oscillatory movement of the one-way drive member in accordance with oscillation of the oscillatory end of the eccentric rod, and this linkage is provided with adjustable means coupled to the eccentric rod for determining and varying the osicllatory path of the oscillatory end of the rod. Manually actuatable means are accessible from the exterior of the casing of the apparatus for adjusting the adjustable means so as to adjustably set the oscillatory path of the oscillatory end of the eccentric rod, and hence the oscillatory movement of the one-way drive member. The apparatus thus provides for precise control and variation of the movement of the cloth-pulling rotors from the exterior of the casing in a very simple and convenient manner.

Claims7

Dependent claims

For use with a sewing machine, a cloth pulling apparatus comprising a casing, a rotatable input shaft carried by said casing and adapted for coupling to a rotary drive source, a pair of output shafts carried by said casing and provided with cloth-pulling rotors mounted so as to feed cloth through a nip between rotors when rotated in opposite directions, and variable transmission means within the casing for converting rotary movement of said input shaft to intermittent unidirectional rotation of at least one of said output shafts and cloth-pulling rotors, said transmission means comprising a rod carried eccentrically and pivotally at one of its ends by said input shaft such that rotation of said input shaft effects oscillation of the other end of said rod, a one-way drive member coupled to said output shafts such that oscillatory movement of said one-way drive member effects intermittent unidirectional but respectively opposite rotation of said output shafts, means for effecting oscillatory movement of said one-way drive member in accordance with oscillation of said other end of said rod, adjustable means coupled to said eccentric rod for determining and varying the oscillatory path of said other end of said rod, and manually actuatable means accessible on the exterior of said casing for adjusting said adjustable means so as to adjustably set the oscillating path of said other end of said rod and hence the oscillatory movement of said one-way drive member, said adjustable means comprising a first link mounted for pivotal movement about an adjustably movable center and coupled to said rod such that pivotal movement of said first link about its center determines the oscillatory path followed by said other end of said rod, and said manually actuatable means comprising an adjustment member extending from the exterior of said casing and coupled with said adjustably movable center for determining and varying the location of said adjustably movable center within said casing.

For use with a sewing machine, a cloth pulling apparatus comprising a casing, a rotatable input shaft carried by said casing and adapted for coupling to a rotary drive source, a pair of output shafts carried by said casing and provided with cloth-pulling rotors mounted so as to feed cloth through a nip between the rotors when rotated in opposite directions, and variable transmission means within the casing for converting rotary movement of said input shaft to intermittent unindirectional but respectively opposite rotation of said output shafts and cloth-pulling rotors, said transmission means comprising oscillatory means oscillatably driven in response to rotation of said input shaft, unidirectional drive means responsive to oscillation of said oscillatory means for unidirectionally rotating said output shafts intermittently in respectively opposite directions over arcs dependent upon the oscillatory path traversed by said oscillatory means, adjustable means for determining and varying the oscillatory path of said oscillatory means, and manually actuatable means accessible on the exterior of said casing for adjusting said adjustable means so as to adjustably set the oscillatory path of said oscillatory means and hence the intermittent unidirectional rotation of said output shafts, wherein said adjustable means comprises a link pivotally coupled at one end to said oscillatory means and pivotally coupled at its other end to a pivot center such that the oscillatory path of said oscillatory means is an arcuate path about said pivot center, and means for selectively moving said pivot center along an arcuate path.

Dependencies are inferred from the claim text.