Abstract A control device is provided for use with an apparatus adapted for the disposition of granular material upon a moving sheet of substrate during the manufacture of roofing shingles. The control device comprises a rotatable cam driven by the shingle manufacturing apparatus and having a variable cam surface, a slidable switch adapted to periodically energize an electric clutch to control the disposition of the granular material, said switch having an actuating arm in contact with the cam surface, an electro-pneumatic transducer responsive to the speed of the moving sheet of substrate and adapted to emit an output signal proportional in magnitude to such speed, and a pnuematic cylinder controlled by the output signal of the transducer and having an extendible stem in engagement with the switch to slide said switch along the cam surface in a direction parallel to the axis of rotation of said cam a distance corresponding to the substrate feed speed, and thereby control the position of the switch actuating arm with respect to the variable cam surface to change the duration of the actuation of the switch, so that disposition of the granular material corresponds with the substrate speed.
A control device for use in conjunction with an asphalt shingle manufacturing device of the type having at least one power driven feed roller for advancing asphalt substrate material, a blender feed roller for depositing granular material on the moving asphalt substrate, and an electric brake clutch for controlling the operation of the blender feed roller, comprising, in combination, a cam operatively connected for rotational movement to the power driven feed roller and having a cam surface which varies in shape across the face thereof; a switch electrically connected to the brake clutch slidably disposed in close juxtaposition to said cam and having an actuating arm in sliding operative contact with the cam surface to periodically energize and de-energize said brake clutch in response to the rotational movement of said cam; pneumatic means having an extendible stem in operative engagement with said switch to move the switch along the cam surface in a direction parallel to the axis of rotation of said cam; and electro-pneumatic transducer means operatively connected to the pneumatic means and responsive to the speed of the asphalt feed roller, aDapted to emit an output signal proportional in magnitude to such speed to actuate said pneumatic means to cause the stem thereof to move said switch along the cam surface a distance corresponding to the magnitude of the output signal; said cam surface being shaped such that the duration of each switch actuation increases as the speed of the asphalt feed roller increases.
Claim 2
Dependent Claim
246 words
A control device for use in conjunction with an asphalt shingle manufacturing device of the type having at least one power driven feed roller for advancing asphalt substrate material, a blender feed roller for depositing granular material on the moving asphalt substrate, and an electric brake clutch for controlling the operation of the blender feed roller, comprising, in combination, a cam operatively connected for rotational movement to the power driven feed roller and having a cam surface which varies in shape across the face thereof; a switch electrically connected to the brake clutch slidably disposed in close juxtaposition to said cam and having an actuating arm in sliding operative contact with the cam surface to periodically energize and de-energize said brake clutch in response to the rotational movement of said cam; pneumatic means having an extendible stem in operative engagement with said switch to move the switch along the cam surface in a direction parallel to the axis of rotation of said cam; and electro-pneumatic transducer means operatively connected to the pneumatic means and responsive to the speed of the asphalt feed roller, aDapted to emit an output signal proportional in magnitude to such speed to actuate said pneumatic means to cause the stem thereof to move said switch along the cam surface a distance corresponding to the magnitude of the output signal; said cam surface being shaped such that the duration of each switch actuation increases as the speed of the asphalt feed roller increases.
Claim 3
Dependent Claim
76 words
A control apparatus in accordance with claim 1, in which the cam surface includes an indented portion defined by a pair of spaced apart steps extending in an axial direction substantially across the entire face of the cam, at least one of said steps being disposed at an angle with respect to the other of said steps, so that the distance therebetween varies from one end of the cam to the other end of the cam.
Claim 4
Dependent Claim
22 words
A control apparatus in accordance with claim 2, in which the relative position of the indented portion of the cam is adjustable.