Abstract: A multi-thread single-line shuttle stitch line, consisting of at least three threads, where each top thread is independently and separately connected with each bottom thread in a pre-determinable sequence of such connection through perforations in the material, with all of said top and bottom threads passing through said perforations, making one stitch line. The top threads can be intertwined, as can the bottom threads.

Abstract: A mechanical, cam disk controlled zigzag sewing machine which provides an infinite zigzag adjustment device whereby a cam follower lifter restricts the zigzag width. The adjusting device returns to its initial position each time the cam follower lifter is actuated, i.e. when a new stitch pattern is selected. The adjustment device has the shape of a gradually rising cam profile and actuates a slide (31) which, by means of a finger (51), extends into the path of movement of the cam follower (48) in order to restrict the same with the result that the lateral movement of the needle is restricted in one direction.

Abstract: A switching device is provided for a sewing machine for switching operation of the sewing machine from a zigzag stitching to embroidering or vice versa. The switching device comprises a rotatable disc fixedly mounted on an output shaft of a stepping motor and a sliding member that movably connects one end of a transmission rod via a pin, the other end of which is connected to a needle bar supporter or a fabric feed device, with the rotatable disc so that the one end of the transmission rod is movable between a first position on the rotatable disc which coincides with the center of rotation of the rotatable disc, and a second position on the rotatable disc which is spaced apart from the center of rotation of the rotatable disc.

Abstract: A fancy seam sewing machine has an infinitely variable zigzag module (47,51,58) which also includes a continuous setting of stitch positions in a stitch field between two outer positions of the needle. The arrangement includes a slide (51) in cooperation with a guide (58) and a setting device (48,49) for the slide as well as a driving unit (33,62) for an oscillatory movement of the guide. The slide has direct contact with the needle bar, which then carries out through the slide an arbitrarily set proportion of the said oscillatory movement.

Abstract: Automatic device for detaching the cam followers in a sewing machine where a selector knob, when it is rotated, provides the detachment of the cam followers in the first portion of rotation, and positions the desired cam in correspondence of the cam follower in the second portion of rotation. On the reduction collar of the selector knob two opposite grooves are made out, which engage pins transmitting the translation movement to a shaft which operates a cam follower detaching lever.

Abstract: In a pattern cam selecting device of a sewing machine having a plurality of stacked pattern cams, a swingable element is provided, which can be moved in one direction to disengage a cam follower from one of the stacked pattern cams. The cam selecting device further includes a locking element, a clutch mechanism, and actuating mechanism, and a cam rotated upon the rotation of a main shaft of the sewing machine. The swingable element is locked in the follower-disengaging position by the locking element while clutch mechanism is held in an inoperative position by a holding element. The locking element which normally engages the actuating mechanism includes a follower element which is held in a position out of a rotation path of the cam.

Abstract: A cam selecting drum which is loosely supported in punched out holes in the frame of a sewing machine is spring biased into stabilized indexed positions to prevent variable stitch formation, and an idler gear which is also loosely supported on said frame for engagement with a gear on said drum as well as a gear on a mode selecting dial is spring biased to provide a loose meshing relationship with the gear on the drum whereby a feeling of placement of the dial becomes evident in indexed positions of the drum.

Abstract: A sewing machine is equipped with an automatic control assembly for the needle bight and/or the feed dog. The control assembly comprises a control cam block having a plurality of juxtaposed cam track portions to be operatively connected, through a contact mechanism, to the sewing machine needle or to a device for setting the feed dog. The contact mechanism comprises a contact finger which can be set by a handwheel, and a cam track connected to the handwheel, against one of the various cam track portions. The handwheel is mounted on a shaft carrying the control cam block, while the cam track connected to the handwheel forms a ring surrounding the control cam block. The contact finger directly engages the cam track, so that a control assembly of small overall length and having a small number of parts is obtained.