Advancing material of indeterminate length – By intermittent material-mover – With retrograde movement preventer
Patent
1980-02-01
1982-01-26
McCarthy, Edward J.
Advancing material of indeterminate length
By intermittent material-mover
With retrograde movement preventer
226162, B65H 1744, B65H 1736
Patent
active
043124690
ABSTRACT:
There is provided a measuring apparatus for successively and intermittently feeding one or more elongate workpieces (A) to a working machine. Between an attachment means (2) and a fixed clamping element (4) there is arranged a further clamping element (7) which is reciprocatingly movable along a pair of guides (6). As the movable clamping element (7) makes a working stroke, the workpiece (A) is able to pass freely through the fixed clamping element (4). Upon return movement of the movable clamping element (7), however, the workpiece is held by the fixed clamping element, with the movable clamping element (7) returning to its rearward limit position out of engagement with the workpiece. The movable clamping element (7) is connected, via a piston rod (10), to the piston (9) of a pneumatic cylinder (8) of variable volume, said cylinder having an end plate (11) which is displaceable therein. The end plate (11) is held in selected positions along the cylinder (8) by means of a displaceable clamping ring (12) arranged to co-operate with a screw and nut arrangement (13). The end plate (11) has arranged therein a compressed-air connection (16), a damper (18), and a reversing valve (19), and defines the rear limit position of the movable clamping element (7). The forward limit position of said clamping element is determined by a reversing valve (39) arranged in said movable clamping element and adapted to co-act with a movable abutment (27) in the fixed clamping element (4). The length of stroke of the apparatus can be roughly set by positioning the end plate (11) in the cylinder (8) and then finely adjusting the setting of the working stroke (27).
REFERENCES:
patent: 2467740 (1949-04-01), Haller
patent: 2622874 (1952-12-01), Haller
patent: 3937379 (1976-02-01), Narwid
patent: 4167239 (1979-09-01), Bihler
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