Sms Schloemann-siemag Aktiengesellschaft

Gerd Jung

Heinrich Kutz

Gunter Ostlinning

A tightening device for the gripping jaws of a plate stretcher comprises one push rod for each pair of gripping jaws sliding in guides in the gripping head in the stretching plane, and having hinged thereto two link rods which are also hinged to the gripping jaws, the gripping jaw moving synchronously rearwards for the closing operation and forwards for the opening operation, in two guides disposed in V-formation to each other. The link rods are coupled to the gripping jaws in a disengageable manner to avoid damage to the link rods and tightening device if tearing of the plate takes place during the stretching operation, or on account of any difference in the gripping of the plate by the upper and lower gripping jaw causing generation of very large but different forces on the two link rods. The link rods are in the form of angle levers each having a long and short arm pivotally connected to the hydraulically mobile push rod. Each short arm is pivotally connected to a separate hydraulic cylinder disposed on the push rod, and the long arm is releasably coupled by way of mouth-shaped openings to entrainment cams on the gripping jaws so that they can be uncoupled therefrom by swivelling.

Tightening device for the gripping jaws of a plate stretcher

A gripping head (2) of a sheet stretcher has a centering device (4) for centering a sheet (1) to be stretched in the middle of the gripping head (2) before the sheet is gripped and stretched. The centering device comprises two centering arms (5) which move with their edges towards the longitudinal sides of the sheet and are synchronously displaced in opposite directions and at right angles to the axis of stretching. In order to facilitate optimum gripping of the sheet automatically, guide rods (9) having engaging members (10) sliding thereon are provided on the centering arms (5) and extend parallel to the axis of stretching. The ends of the engaging members (10) have stops (14), against which the front end of the sheet (1) bears when fully inserted. A distance-measuring device (18), is provided on the centering arm (5) and has a cable drum (22) and a potentiometer (20) on the same shaft (21). The end of the cable is secured to the engaging member ( 10). In this way the depth of insertion may be measured and controlled by the potentiometer (20).

Growing community of inventors

Koblenz, Germany

Gerd Jung