Single cut shear
AssigneeSouthwire Company
InventorsJames W. Peters, Charles Hardesty
Life of this patent
Estimating the term…
Abstract
An improved rotary shearing apparatus for cutting a rapidly moving body including rotatable blades which may be inserted into a cutting position and withdrawn therefrom, positioning means for inserting or withdrawing the blades into or out of cutting position, and automatic switches and circuitry capable of causing insertion of the blades and their withdrawal within one rotation of the blades, so that the blades will sever the rapidly moving body with a single clean cut and without disturbing its rapid movement.
Claims10
In a rotary shear for cutting elongate material passing through a passageway formed between two guide wheels rotating in opposite directions by selectively positioning a cutting means rotating with said guide wheels for cutting said material in said passageway and having a positioning means for moving said cutting means into a cutting position in said passageway while a first switching means is operative and for moving said cutting means from said cutting position in said passageway while a second switching means is operative, including:
- operating means for causing said first switching means to become operative at a first particular rotational position of said guide wheels and for selectively causing said second switching means to become operative at a second particular rotational position of said guide wheels;
- and conditioning means responsive to said first switching means being operative for a first predetermined rotation of said guide wheels for rendering said second switching means operative in response to said operating means at said second particular rotational position of said guide wheels, said operation of said second switching means at said second particular rotational position occurring within a second predetermined rotation of said guide wheels following the response of the conditioning means to the first switching means being operative for a first predetermined rotation of said guide wheels, wherein said first and second switching means comprise magnetically actuated vane switches, said operating means comprises a pair of vanes extending from a shaft member rotating in synchronization with said guide wheels and positioned on said shaft member so that the first of said pair of vanes passes through said first switching means and the second of said pair of vanes passes through said second switching means, and said conditioning means comprises a third magnetically actuated vane switch through which passes the first of said pair of vanes.
In a rod shear of the type comprising a pair of parallel rotatable shaft members, a motor means connected to one of said shaft members, gear means connecting said shaft members and confining them to synchronous opposite rotation, a pair of wheels each having grooved peripheral surface and a blade slot extending radially into said surface and through the wheel, one of said wheels connected to and rotatable with each of the shaft members, said wheels and shaft members mounted in a position wherein the grooves in the circumferential surfaces of the wheels are adjacent one another at a point forming a passageway between the adjacent wheels wherein may pass a metal rod, said wheels in a rotational relation with respect to one another wherein the blade slots will pass the point at which the wheels are adjacent at the same moment during each revolution of the wheels, a pair of blades, one of said blades mounted on and rotatable with each wheel and insertable into the blade slot of said wheel, positioning means for selectively inserting or retracting the blades from their respective blade slots in unison, and control means for producing a signal to cause the positioning means to insert and retract the blades, said positioning means having a response time from the receipt of the signal from the control means until the completion of insertion or retraction of the blades near or greater than the time passing during one revolution of the wheels, the improvement in said control means comprising:
- a manual start switch;
- a first vane rotating with the shaft member of said pair of shaft members which rotates in a counterclockwise direction and extending from said shaft member at a rotational position 270.degree. counterclockwise from the position of the blade in the wheel which is mounted on said shaft member;
- a second vane rotating with said shaft member and extending from said shaft member at a rotational position 150.degree. counterclockwise from the position of said blade in said wheel;
- a first magnetically actuated vane switch mounted in the path of said first vane at a rotational position 90.degree. counterclockwise from the point where said passageway is formed;
- a second magnetically actuated vane switch mounted in the path of said second vane at the rotational position where said passageway is formed;
- a third magnetically actuated vane switch mounted in the path of said first vane at a rotational position 270.degree. counterclockwise from the point where said passageway is formed;
- a first circuit responsive to said start switch to enable said first vane switch to respond to triggering by the passage of said first vane;
- a second circuit responsive to the triggering of said first vane switch to enable said third vane switch to respond to triggering by the passage of said first vane;
- and
- a third circuit responsive to the triggering of said third vane switch to enable said second vane switch to respond to triggering by the passage of said second vane;
- said first vane switch signalling the positioning means to insert said blades when triggered by said first vane and said second vane switch signalling the positioning means to withdraw said blades when triggered by said second vane.
Dependencies are inferred from the claim text.