Bending machine for bending flat material, and method for bending shut a standing fold in a flat material using the bending machine

Abstract

A bending machine for bending flat material, including a first clamping beam, a second clamping beam, and a first bending beam. The bending machine includes a counter-holding device for performing a counter-holding function at the flat material. The counter-holding device may include a counter-holding element. The counter-holding element is movable between a parked position, in which it is arranged at a distance from the flat material and in which the counter-holding function cannot be performed, and a counter-holding position, in which it can be in contact with the flat material to be bent and in which the counter-holding function can be performed such that that the counter-holding element is capable of counter-holding against a bending force which is applied to the flat material by means of the first bending beam when the flat material is bent about a bending axis that is spaced apart from the clamping plane.

1 . A bending machine for bending flat material, comprising
 a first clamping beam and a second clamping beam for clamping the flat material to be bent in a clamping plane, and   a first bending beam for bending the flat material   wherein   the bending machine comprises a counter-holding device for performing a counter-holding function at the flat material to be bent, said counter-holding device being present in addition to the first clamping beam and the second clamping beam and having a counter-holding element, wherein the counter-holding element is movable between a parked position, in which it is arranged at a distance from the flat material to be bent and the counter-holding function cannot be performed, and a counter-holding position, in which it can be in contact with the flat material (F) to be bent and the counter-holding function can be performed in such a manner that the counter-holding element is capable of counter-holding against a bending force which is applied to the flat material by means of the first bending beam when the flat material is bent about a bending axis that is spaced apart from the clamping plane.   
     
     
         2 . The bending machine according to  claim 1 ,
 wherein   the counter-holding device is mounted on a machine frame of the bending machine.   
     
     
         3 . The bending machine according to  claim 2 ,
 wherein   the machine frame has a machine upper part and a machine lower part, which are movable relative to one another, and the counter-holding device is mounted on the machine upper part.   
     
     
         4 . The bending machine according to  claim 1 ,
 wherein   the counter-holding element has a counter-holding surface and/or a counter-holding line for contact with the flat material to be bent.   
     
     
         5 . The bending machine according to  claim 3 ,
 wherein   the counter-holding device has at least one carrier arm to which the counter-holding element is fastened.   
     
     
         6 . The bending machine according to  claim 3 ,
 wherein   the counter-holding device has at least one carrier arm to which the counter-holding element is fastened.   
     
     
         7 . The bending machine according to  claim 5 ,
 wherein the carrier arm is movable along a guide device between a first end position and a second end position, wherein the first end position corresponds to the parked position of the counter-holding element and the second end position corresponds to the counter-holding position of the counter-holding element.   
     
     
         8 . The bending machine according to  claim 6 ,
 wherein the carrier arm is movable along a guide device between a first end position and a second end position, wherein the first end position corresponds to the parked position of the counter-holding element and the second end position corresponds to the counter-holding position of the counter-holding element.   
     
     
         9 . The bending machine according to  claim 7 ,
 wherein the counter-holding device comprises a setting device for setting a relative location of at least the second end position of the carrier arm relative to the guide device, so that it is possible at least to set the carrier arm such that, in its second end position, it is located in a stop position which is defined by a stop of the guide device.   
     
     
         10 . The bending machine according to  claim 9 ,
 wherein the setting device is a turnbuckle.   
     
     
         11 . The bending machine according to  claim 9 ,
 wherein the stop is adjustable relative to the machine frame or to the machine upper part, and adjusting means for adjusting the stop are present, so that a spatial location of the counter-holding element in its counter-holding position is adjustable when the carrier arm is in the stop position.   
     
     
         12 . The bending machine according to  claim 8   wherein the guide device is in the form of a slotted link guide and comprises at least one guide plate which is fastened to the machine frame or to the machine upper part, wherein the at least one guide plate or the carrier arm has two slotted link tracks for defining a slotted link guide path, and wherein there are mounted on the carrier arm or on the at least one guide plate at least two slotted link blocks which are each forcibly guided in one of the two slotted link tracks, so that the carrier arm is movable in a spatially oriented defined orientation along the slotted link guide path between its first end position and its second end position.   
     
     
         13 . The bending machine according to  claim 8   wherein the guide device is in the form of a track guide having at least one track rail which is fastened to the machine frame or to the machine upper part, wherein the carrier arm is movable in the manner of a carriage along the track rail between its first end position and its second end position.   
     
     
         14 . The bending machine according to  claim 7   wherein the counter-holding device has at least one drive member for moving the carrier arm.   
     
     
         15 . The bending machine according to  claim 8 ,
 wherein the counter-holding device has at least one drive member for moving the carrier arm.   
     
     
         16 . The bending machine according to  claim 15 ,
 wherein a setting device is so arranged in a force transmission path between the drive member and the carrier arm that it is itself involved in the transmission of force between the drive member and the carrier arm.   
     
     
         17 . The bending machine according to  claim 14 ,
 wherein the bending machine has a plurality of carrier arms which together carry the counter-holding element, wherein the counter-holding device comprises a shaft, at least one first lever which is connected in a rotationally fixed manner to the shaft, and a plurality of second levers which are each connected in a rotationally fixed manner to the shaft and are each associated with one of the plurality of carrier arms, and wherein the first lever is operably connected at a point spaced apart from the shaft to the drive member, and the second levers are each operably connected at a point spaced apart from the shaft to the respective carrier element, so that, by actuation of the drive member, a torque can be transmitted to the first lever, to the shaft and to the plurality of second levers, and an actuating force can be applied to the respective carrier arm.   
     
     
         18 . A method for bending shut a standing fold in a flat material using a bending machine which has a first clamping beam and a second clamping beam for clamping the flat material to be bent in a clamping plane, and a first bending beam for bending the flat material, wherein the bending machine comprises a counter-holding device for performing a counter-holding function at the flat material to be bent, said counter-holding device being present in addition to the first clamping beam and the second clamping beam and having a counter-holding element, wherein the counter-holding element is movable between a parked position, in which it is arranged at a distance from the flat material to be bent and the counter-holding function cannot be performed, and a counter-holding position, in which it can be in contact with the flat material to be bent and the counter-holding function can be performed in such a manner that the counter-holding element is capable of counter-holding against a bending force which is applied to the flat material by means of the first bending beam when the flat material is bent about a bending axis that is spaced apart from the clamping plane,
 wherein the method comprises the following steps:
 moving the counter-holding element from the parked position into the counter-holding position, in which it is spaced apart from the clamping plane and is able to support a first leg of the standing fold that is not to be bent, 
 bending the standing fold shut about the bending axis by applying the bending force by means of the first bending beam to a second leg of the standing fold that is to be bent, and 
 counter-holding against the bending force during step b) in that the first leg that is not to be bent is contacted by means of a counter-holding surface or a counter-holding line of the counter-holding element and is thereby supported. 
   
     
     
         19 . The bending machine according to  claim 1  wherein the counter holding element is a counter holding strip. 
     
     
         20 . The bending machine according to  claim 12 , wherein the slotted link tracks are elongated holes.