Patent GB-377579-A (GB)
Title: Adjusting device for plate straightening machines
IPC: B21D1/02
Filed: 1932-02-01
Abstract: 377,579. Straightening plates electric motor control systems ; electric switches. UNGERER, F., 6, Arlingerstrasse, Pforzheim, Germany. Feb. 1, 1932, No. 2996. Convention date, Jan. 31, 1931. [Class 83 (iv).] In a metal plate straightening machine in which the rolls are driven by a motor, the upper row of rolls a is mounted in a yoke oscillated by an auxiliary motor so as to incline the upper row of rolls relatively to the lower row b. The rolls a are mounted in a box-shaped yoke c, which is provided at each end with a curved race d<2> so that it may run on rollers d<1> carried by bars d suspended from the transverse bar h. The yoke is oscillated by a cam c<4> carried by a shaft c<3> operated by an auxiliary motor f through worm gear f<2>. On the shaft c<3> are loosely mounted a pair of levers c<6>, c<7> which may be set in any position on a fixed notched segment c<8> and co-operate by means of elements x<1>, x<2> with one of the buttons i<1>, i<2> of a switch i carried by a lever c<5> keyed to the shaft c<3> so as to stop the motor f when the desired inclination is obtained. The operations are controlled by a cylinder p, each half of which has five positions corresponding to the two directions of motion. When the controller is turned into position 1 on the right the phase R of a three-phase current R, S, T, is connected via contacts R<1>, W<2>, to the wire W of the stator of the roll driving motor g and the phase T is connected via contacts T<1>, U2 to the wire U. At the same time contacts R<1> and e<2> are connected and through the switch i energize a relay m so as to close a switch y and thus connect the wires U, W, of the auxiliary motor f and magnetic brake q to the supply. The brake is thus released and the motor f put in operation. When the yoke reaches the desired position the motor f is stopped and the brake is put on by a weight q<1> due to de-energizing the relay m by operation of the switch i. During the movement of the yoke the controller may be moved through positions 1 to 5 to cut out resistances and finally to short-circuit the armature of the motor g, so that it attains its maximum speed when the motor f is stopped. Depression of the button i<1> raises the button i<2> so that when the controller is moved to the first position on the left the relay m is energized through the contacts R<1>, e<1> and the motors connected in the opposite direction through contacts R<1>, U<1> and T<1>, W<1>. In order to operate with the rows of rolls parallel to each other a switch k in the relay circuit is opened. The switch buttons i<1>, i<2> which are in different planes so that they can only be operated by one of the levers c‹, c<7>, engage horns i<17> on an element i<13> which is oscillated on a pivot i<12>. To this element is pivoted at i<14> a second element i<8>, which is connected by a spring i<15> to the pivot i<12> so as to switch over suddenly to prevent sparking at the break. This element carries a pair of caps i<10>, pressed apart by a spring so as to engage either of two pairs of contacts i<7> to which the conductors are secured.