Metal deforming – By use of non-deforming work-gripping clamp and relatively... – By individually non-deforming clamps
Patent
1982-03-18
1984-07-17
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
By individually non-deforming clamps
72311, 72 34, 33169B, 33172D, 33191, B21D 1102
Patent
active
044598386
ABSTRACT:
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).
REFERENCES:
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patent: 3798779 (1974-03-01), Gluck
patent: 4249405 (1981-02-01), Cyr
patent: 4349959 (1982-09-01), Urban
Jung Gerd
Kutz Heinrich
Crane Daniel C.
SMS Schloemann--Siemag Aktiengesellschaft
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