The machine tool comprises a frame (1, 2, 3) with two fixing elements (22 and 39) for fastening a scroll saw blade. The fixing element (22) is driven by an electrical motor (5) in a vertical reciprocating movement. The two fixing elements (22 and 39) are linked to each other by a metallic ribbon (45) passing on pulleys (46 to 50). The position of the pulley (47) can be changed by means of a cam (53) acting on an arm (52) so as to stretch the ribbon (45) to the desired value.

A sheeter for a web fed printing press having: an infeed section; a first cutting head into which the infeed section feeds the web, the first cutting head for cutting the web transversely comprising a circular knife cylinder and corresponding anvil cylinder having circumferences larger than the repeat length of the press; a sheet transfer section having rollers, which moves the cut web from the first cutting head to a second cutting head; the second cutting head comprising a circular knife cylin...

A clamping apparatus allowing an operator to securely position and clamp a cut-off die set to the carriage of a cut-off press. The clamping arrangement includes outwardly beveled sides on the die set coacting with an inwardly beveled stop and an inwardly beveled eccentric clamping member. The clamping member being rotatable to allow the die set to be placed in the proper position on the carriage. After positioning the die set on the carriage, the eccentric clamping members are rotated to contact...

A miter saw has a base on which a workpiece is placed, a miter saw unit substantially vertically pivotally mounted on the base, a drive supported by the miter saw unit for driving a rotary tool, a blade case mounted on the miter saw unit and partly covering the rotary tool so as to provide an exposed operational portion of the rotary tool, a safety cover pivotally mounted on the blade case for covering the exposed operational portion of the rotary tool, and an actuating link having a slot formed...

A portable electric tool, such as, for example, shears or secateurs suitable for pruning and/or harvesting work, comprises at least one moving working component disposed at the front and of a hollow frame one part of which forms the handle of the tool and inside which are housed an electric motor and a speed reducer. The outlet of the speed reducer is connected to the moving working component by means of a transmission system which comprises a moving gear unit. The tool also includes a trigger w...

There is provided a method and apparatus for maintaining the cutting conditions constant at a rotary punch by bringing the rotary punch to a constant, predetermined temperature and maintaining the rotary punch at that temperature. Tempering elements are included in the rotary punch so as to maintain constant and set the spacing of the cylindrical envelope described by the cutting edge or edges from the opposing tool.

A method and apparatus for preparing skived belting ends for joining by means of fasteners, and like products. A guide block is temporarily fastened across the width of the belting, serving as a guide for a chain saw tool. A first side edge portion of the tool slidably engages the guide block while permitting the cutting plane to be transverse to the direction of said width and intersecting with the belting surface to skive it. Thereafter, a second side edge portion of the tool slidably engages ...

A pocket size inexpensive punch mechanism is provided to punch openings in paper objects, the punching teeth having a configuration especially adapted to produce sharp initial penetration of the paper object, followed by smoother cutting of the remainder of the opening.

A hydraulic drilling machine comprises a drill tool (1) connected to a hydraulic motor (3), a hydraulic percussive mechanism (4) connected via a hydraulic distributor (15) to a hydraulic pressure line (11) and to a hydraulic discharge line (21), and a means (16) for sucking the liquid from the working chamber of the hydraulic percussive mechanism (4) during its idle stroke. The means (16) includes a mixing chamber (17) connected to the discharge line of the hydraulic percussive mechanism, an eje...

A hydraulic percussion apparatus has an elongated housing having a front nose piece and forming a chamber extending along an axis, a tool projecting axially backward through the nose piece into the housing and having in the nose piece an axially forwardly directed shoulder, and a piston axially reciprocal in the chamber and axially forwardly engageable with the tool. A high-pressure line, a low-pressure line, and a control valve can axially oppositely pressurize the piston and thereby hammer the...