Apparatus for the intermittent supply of a semi-finished material in the form of a band or a wire to a press

An apparatus for the intermittent supply of a semi-finished material in the form of a band or a wire to a press, with a pair of displacement grippers, running forwards and backwards during operation, for advancing the semi-finished material in an advancing phase, a stationary pair of clamping grippers for holding the semi-finished material in a fixed manner in a non-advancing phase, and a control rocker with a rocker drive coupled to one control end of the said control rocker, wherein the pair of displacement grippers and the pair of clamping grippers are coupled mechanically to the control rocker in such a way that during operation they can be opened and closed in an alternating manner by reciprocating the control end of the control rocker with the rocker drive, in order to allow the semi-finished material to be alternately advanced and held in a fixed manner with the apparatus, wherein the control rocker and the two pairs of grippers are designed and are coupled to one another in such a way that in the absence of a supporting or actuating force exerted by the rocker drive upon the control end of the control rocker the two pairs of grippers are closed, wherein the two pairs of grippers are coupled to the control rocker at points spaced apart from one another as viewed in a direction transverse to a pivot axis of the control rocker, and the coupling point of the pair of displacement grippers to the control rocker is situated, in particular, centrally between the coupling point of the pair of clamping grippers and the control end of the control rocker, wherein one or more pre-stressed spring elements, in particular one or more compression springs and/or tensile springs, engage on the control rocker, in such a way that a closing of the pairs of grippers is assisted by the spring force of the said spring elements, and wherein the force-engagement point of the spring element or, in the case of a plurality of spring elements, the resulting force-engagement point is situated, in particular, centrally in the region between the two coupling points of the pairs of grippers.

An apparatus for the intermittent supply of a semi-finished material in the form of a band or a wire to a press, with a pair of displacement grippers, running forwards and backwards during operation, for advancing the semi-finished material in an advancing phase, a stationary pair of clamping grippers for holding the semi-finished material in a fixed manner in a non-advancing phase, and a control rocker with a rocker drive coupled to one control end of the said control rocker, wherein the pair of displacement grippers and the pair of clamping grippers are coupled mechanically to the control rocker in such a way that during operation they can be opened and closed in an alternating manner by reciprocating the control end of the control rocker with the rocker drive, in order to allow the semi-finished material to be alternately advanced and held in a fixed manner with the apparatus, wherein the control rocker and the two pairs of grippers are designed and are coupled to one another in such a way that in the absence of a supporting or actuating force exerted by the rocker drive upon the control end of the control rocker the two pairs of grippers are closed, wherein the apparatus is designed in such a way that the two pairs of grippers can be opened and closed in an alternating manner during operation by an upward and downward movement of the control end of the control rocker, and wherein the pairs of grippers have in each case one half of the grippers which is non-movable in the closing direction and one half of the grippers which is movable in the closing direction, and they are coupled to the control rocker in such a way that during the opening and closing of the respective pair of grippers the control rocker performs a movement in the same direction as the opening and closing movement of the movable half of the grippers in the region of the coupling point of the respective pair of grippers.

An apparatus for the intermittent supply of a semi-finished material in the form of a band or a wire to a press, with a pair of displacement grippers, running forwards and backwards during operation, for advancing the semi-finished material in an advancing phase, a stationary pair of clamping grippers for holding the semi-finished material in a fixed manner in a non-advancing phase, and a control rocker with a rocker drive coupled to one control end of the said control rocker, wherein the pair of displacement grippers and the pair of clamping grippers are coupled mechanically to the control rocker in such a way that during operation they can be opened and closed in an alternating manner by reciprocating the control end of the control rocker with the rocker drive, in order to allow the semi-finished material to be alternately advanced and held in a fixed manner with the apparatus, wherein the control rocker and the two pairs of grippers are designed and are coupled to one another in such a way that in the absence of a supporting or actuating force exerted by the rocker drive upon the control end of the control rocker the two pairs of grippers are closed, wherein all the force-introduction points into the control rocker, or in the case of a plurality of introduction points for the same force the respective resulting force-introduction points in each case, are situated in a plane which is at a right angle to a pivot axis of the control rocker, in such a way that the control rocker is free of torsional moment during operation, and wherein the plane in which the force-introduction points are situated extends during operation through the longitudinal axis of a semi-finished material to be advanced by the apparatus.

An apparatus for the intermittent supply of a semi-finished material in the form of a band or a wire to a press, with a pair of displacement grippers, running forwards and backwards during operation, for advancing the semi-finished material in an advancing phase, a stationary pair of clamping grippers for holding the semi-finished material in a fixed manner in a non-advancing phase, and a control rocker with a rocker drive coupled to one control end of the said control rocker, wherein the pair of displacement grippers and the pair of clamping grippers are coupled mechanically to the control rocker in such a way that during operation they can be opened and closed in an alternating manner by reciprocating the control end of the control rocker with the rocker drive, in order to allow the semi-finished material to be alternately advanced and held in a fixed manner with the apparatus, wherein the control rocker and the two pairs of grippers are designed and are coupled to one another in such a way that in the absence of a supporting or actuating force exerted by the rocker drive upon the control end of the control rocker the two pairs of grippers are closed, wherein the two pairs of grippers are coupled to the control rocker at points spaced apart from one another as viewed in a direction transverse to a pivot axis of the control rocker, and the coupling point of the pair of displacement grippers to the control rocker is situated, in particular, centrally between the coupling point of the pair of clamping grippers and the control end of the control rocker, wherein the apparatus is designed in such a way that the two pairs of grippers can be opened and closed in an alternating manner during operation by an upward and downward movement of the control end of the control rocker, wherein one or more pre-stressed spring elements, in particular one or more compression springs and/or tensile springs, engage on the control rocker, in such a way that a closing of the pairs of grippers is assisted by the spring force of the said spring elements, wherein the force-engagement point of the spring element or, in the case of a plurality of spring elements, the resulting force-engagement point is situated, in particular, centrally in the region between the two coupling points of the pairs of grippers, wherein the two pairs of grippers have in each case an upper half and a lower half which are movable towards each other in order to close the pairs of grippers and are movable away from each other in order to open the pairs of grippers, wherein the lower half of the grippers is designed so as to be non-movable in the closing direction and the upper half of the grippers is designed so as to be movable in the closing direction, wherein the pairs of grippers are coupled to the control rocker in such a way that during the opening and closing of the respective pair of grippers the control rocker performs a movement in the same direction as the opening and closing movement of the movable half of the grippers in the region of the coupling point of the respective pair of grippers and wherein, in order to carry out the reciprocating movement of the control end of the control rocker, the apparatus has a rocker drive which can transmit actuating forces both in the loading direction and in the releasing direction, in particular a connecting-rod or eccentric drive.