Electric press machine
AssigneeApic Yamada Corporation
InventorShigeyuki Uchiyama
Life of this patent
Estimating the term…
Abstract
In a feeding mechanism 4 which reciprocates the feed arm 80 in a direction of transporting a lead frame, a movable body is linked via a second fulcrum 37 (movable fulcrum) with a rocking arm 30 which is pressingly contacted with a feed cam 11 and which rocks about a first fulcrum 31 (stationary fulcrum), rocking movement of the rocking arm 30 is converted into linear movement of the movable body which is directly coupled to reciprocal movement of the feed arm 80, and the distance between the first fulcrum 31 of the rocking arm 30 and the second fulcrum 37 is changed in the longitudinal direction of the rocking arm 30, thereby enabling a feed stroke of the feed arm 80 to be linearly changed.
Claims13
An electric press machine which conducts press working on a lead frame in which pilot holes are formed while the lead frame is pitch fed to a press section having a press die, said electric press machine comprising:
- a feed arm having pins which are engageable with the pilot holes of the lead frame;
- a feeding mechanism which reciprocates said feed arm in a direction of transporting the lead frame;
- a feed plate which, in said press section, guides and supports the lead frame in a movable manner in the transporting direction, and which is disposed so as to be vertically movable;
- a feed plate vertically moving mechanism which vertically moves said feed plate;
- a drive transmitting mechanism which drives said press section, and which rotates a feed cam and a raising cam to transmit driving to said feeding mechanism and said feed plate vertically moving mechanism, said feed cam and said raising cam being disposed on a cam shaft;
- and
- an electric motor which operates said drive transmitting mechanism;
- wherein in said feeding mechanism, a movable body is linked with a rocking arm which is pressingly contacted via a movable fulcrum with said feed cam and which rocks about a stationary fulcrum, rocking movement of said rocking arm is converted into linear movement of said movable body which is directly coupled to reciprocal movement of said feed arm, and a distance between said stationary fulcrum of said rocking arm and said movable fulcrum is changed in a longitudinal direction of said rocking arm, thereby enabling a feed stroke of said feed arm to be linearly changed.
A motor-operated press machine comprising:
- a support table;
- a rocking link which is attached at a middle portion to said support table by a supporting shaft, and which is rockable about said supporting shaft;
- a crank in which a crank shaft serving as a support shaft is rotatably supported on one end portion of said rocking link;
- a press ram which is linked to said crank and which is vertically reciprocated by rotating said crank;
- and
- a driving unit which is coupled to another end portion of said rocking link to rock said rocking link about said supporting shaft, thereby vertically moving said press ram;
- wherein said driving unit, in a usual press working operation, regulates said rocking link to a lateral position with respect to a position above said press ram so that said supporting shaft is on a first straight line which laterally elongates from said crank shaft with respect to a moving direction of said press ram, and, in a resetting operation after jamming or an emergency during a working operation, lowers said other end portion of said rocking link to upward move said press ram to a retracting position above a position where said press ram is located in the usual press working operation.
Dependencies are inferred from the claim text.