Control device for a small press
AssigneeJapan Storage Battery Co., Ltd.
InventorsYasuharu Sakai, Nobuaki Murai, Kiyotaka Nakano
Life of this patent
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Abstract
A control device for a small press is provided with means preventing overloading of the drive motor, a timer for detecting when an operational cycle of the press has exceeded a normal value, and a position detector which notes the position of a cam of the press. The power switch of the drive motor is tripped to suspend the flow of current to the motor upon an indication of the foregoing, e.g., a detected over-current, an excessive cycle time, or an operation end position of the cam.
Claims8
In a small press in which a rocking lever is rockably mounted on a fulcrum shaft extending from a stationary lever, and is rocked by a cam which is formed on a side of a power transmission gear driven by an electric motor, and in which a pressing or cutting die assembly is coupled through shafts to the front end portions of said rocking lever and said stationary lever, a control device comprising:
- position detecting means for detecting an operating cycle of said cam, over-current detecting means for detecting an abnormal load on said motor, delay means inhibiting said over-current detecting means during a time wherein a start current flows in said motor, and power switch means for said motor, said power switch means interrupting the flow of current to said motor in response to a signal from said position detector indicating completion of one operating cycle, or a signal from said over-current detecting means indicating an abnormal load on said motor.
In a small press in which a rocking lever is rockably mounted on a fulcrum shaft extending from a stationary lever, and is rocked by a cam which is formed on a side of a gear driven by an electric motor, and in which a pressing or cutting die assembly is coupled through shafts to the front end portions of said rocking lever and said stationary lever, a control device comprising:
- a power switch for said motor;
- a time detector for detecting when, after said power switch is turned on, a period of time required for one operation cycle of said cam exceeds a predetermined value;
- a signal from said time detector being applied, as a current interrupting signal, to said power switch.
In a small press in which a rocking lever is rockably mounted on a fulcrum shaft extending from a stationary lever, and is rocked by a cam which is formed on a side of a gear driven by an electric motor, and in which a pressing or cutting die assembly is coupled through shafts to the front end portions of said rocking lever and said stationary lever, a control device comprising:
- a power switch for said motor;
- a position detector for detecting when one cycle of operation of said cam is completed;
- a signal from said position detector being utilized to turn off the power switch of said motor and to short-circuit said motor.
Dependencies are inferred from the claim text.