Press machine
AssigneeAida Engineering, Ltd.
InventorsYasuhiko Tanaka, Hideki Hayashi, Masaki Senda
Life of this patent
Estimating the term…
Abstract
A press machine uses a crank mechanism which can perform pressing by a pressing force control when a slide exists in a pressing region. When the slide is determined to exist between an initial position and a switching position to the pressing region, the slide is moved down by rotating a motor regularly by a position control system. When the slide is determined to exist in the pressing region, pressing is performed by moving down the slide such that a slide pressing force becomes equal to a set slide pressing force by a pressing force control system.
Claims15
A press machine comprising:
- a crankshaft;
- a motor connected to the crankshaft and driven to rotate reversibly;
- a slide moving up and down by rotation of the motor;
- a control section controlling the up and down movement of the slide;
- and
- a motor drive control section controlling the drive of the motor based on an output from the control section,
- wherein the control section comprises a position control system and a pressing force control system,
- wherein the position control system moves down the slide from an initial position to a pressing region by controlling the motor to rotate regularly;
- wherein when the slide is determined to exist in the pressing region, the control section substitutes the position control system with the pressing force control system;
- and
- wherein the pressing force control system performs pressing by moving down the slide such that a slide pressing force becomes equal to a set pressing force by controlling the motor to rotate regularly.
A press machine comprising:
- a crankshaft;
- a motor connected to the crankshaft;
- a slide moving up and down by rotation of the motor;
- and
- a control section controlling the up and down movement of the slide;
- wherein the control section comprising:
- a pressing force adjusting mechanism adjusting a relative distance between the crankshaft and the slide in an up-and-down direction;
- a pressing force calculating section calculating a pressing force exerted on the slide as a calculated pressing force;
- a pressing force determining section comparing the calculated pressing force with a set pressing force;
- and
- a control signal outputting section outputting a control signal,
- wherein the pressing force calculating section calculates the pressing force exerted on the slide based on a rotational angle of the crankshaft and a motor drive current both of which are detected before a bottom dead center position,
- wherein the pressing force determining section determines whether the calculated pressing force is larger than the set pressing force,
- wherein when the calculated pressing force is determined to be larger than the set pressing force, the control signal outputting section generates the control signal for moving up the slide and outputs to the pressing force adjusting mechanism,
- wherein when the calculated pressing force is determined to be smaller than the set pressing force, the control signal outputting section generates the control signal for moving down the slide and outputs to the pressing force adjusting mechanism, and
- wherein the pressing force adjusting mechanism increases or decreases the relative distance so as to be adjusted by the control signal, and maintains the adjusted relative distance after finishing the adjustment.
Dependencies are inferred from the claim text.