Abstract: A driving unit which can transmit torque to one end portion of a driven part, such as mandrel or a spindle for convoluted textile or other material, has a rotary driving member one end portion of which has a socket for the one end portion of the driven part and carries a wheel-shaped confining member which is pivotable on the driving member between an operative position in which it prevents removal of the end portion of the driven part and an inoperative position in which the end portion of a driven part can be inserted into or removed from the socket. The confining member is pivotable by a toggle joint which is partially recessed into the driving and/or confining member and is actuatable by a motor and a spring. The spring biases the links of the joint to positions in which the confining member assumes the operative position, and the motor can be actuated to pivot the links in a direction to move the confining member to the inoperative position.

Abstract: In a notching machine using a blade assembly of upper and lower knives mounted respectively on a vertically moving ram and a machine table and each comprising two individual blades forming with their cutting edges a coinciding vertex angle which may be changed by turning the blades relative to each other around a vertical axis of rotation that extends in parallel with the ram near the noses of the knives, a third blade component is provided at least for the upper knife for forming its nose portion with a unitary cutting edge that complements the cutting edges of the two other blades of the upper knife for confining its vertex angle.

Abstract: A coupling for rotatably connecting a reel with a drive shaft has a support which is fast with the drive shaft. The support is provided with a recess which is designed to receive a complementary stub shaft fixed to the reel. The recess has an open side via which the stub shaft may be inserted in and removed from the recess, and an arresting element in the form of a wheel is provided to close the open side. The arresting wheel is pivotally mounted on the support for movement between a release position in which the open side of the recess is exposed to permit insertion of the stub shaft in, and removal of the latter from, the recess, and an arrest position in which the open side of the recess is closed to prevent release of the stub shaft. The pivot axis of the arresting wheel extends at right angles to the axis of rotation of the support.

Abstract: In a notching machine an upper knife is attached by an upper set collar to the head of a vertically moving ram for being turnable around an axis of rotation lying near the nose of the upper knife. The upper set collar is connected through a fixed axis parallel to the axis of rotation with a lower set collar for a common turning around the same axis of rotation. The lower set collar being provided for the attachment of a lower knife and serving as an auxiliary table for workpieces to be notched. The two knives have an equal minimum vertex of, for example, 30.degree. so that with a first working stroke of the ram in a first turning position of the upper and lower set collars and their knives, respectively, this minimum vertex may be notched into the workpieces lying on the auxiliary table and afterwards with a second working stroke of the ram this minimum vertex may be enlarged to any desired larger notching angle up to for example around 120.degree. in a second turning position of the knives.

Abstract: A table stop for a machine for cutting sheet material, more particularly a notching machine, comprising a double acting pressure cylinder for each the adjustment of the stroke of a stop rail along the blade of the cutting tool and its angular adjustment about a vertical pivot axis. The two pressure cylinders being coupled for a trailing movement of the one pressure cylinder provided for the angular adjustment by the other pressure cylinder being provided for the adjustment of the stroke. The relatively movable working members of the two pressure cylinders being connected with the stop rail through pivots.