GB1356979A - Process for multiple bending of rods and a bending machine for carrying out this process - Google Patents

Abstract

1356979 Bending PAUL FERD PEDDINGHAUS 12 Aug 1971 [17 Aug 1970 25 Feb 1971] 37914/71 Heading B3E A bending machine for multiple bending of one or more rods 10 comprises a bending head and a clamping device which may be another bending head or a clamp, and a drive to move one of the heads or one of the head and clamp towards each other between bending operations by the distance between a previously formed bend and a bend to be formed. In one embodiment two bending heads 4, 5 are provided each having a central abutment bolt 14 and a bending tool 13 mounted for movement around the bolt. The bolt and the tool extend between adjustably positioned discs (15), (16), Fig. 3 (not shown), one of which is removable to permit removal of the bent rod. The head 5 has an adjustable position rod cutter 7. The heads are movable on rails 3 provided with adjustable stops 6 which may have switches to actuate the machine. In operation one or more rods 10 are fed from a bed 1 through the heads which are close together. The head 4 effects a bend in the leading end of the or each rod b, Fig. 5, and then moves away from the head 5. The head 4 serves to hold the rod or rods while the head 5 effects a bend at the other end c. The head 5 is moved towards the head 4 by the distance between the end bend and the bend to be made and effects a further bend d. The movement is repeated for a further bend e. Thereafter the head 5 holds the rod or rods and the head 4 is moved and effects bends f, g. The drive for the heads is provided with a switching off device controlled by the movement of the heads, the drive being automatically switched on after each bending operation. In an alternative embodiment there is only one bending head (101), Fig. 6 (not shown), and a clamping carriage (103) which can be sequentially driven by a piston-cylinder unit (107), (108) or an impulse generator (119). In each case a sequence programme control (117) is used to actuate a valve (111) or a switch (120) to stop the carriage drive. In the first case a timer (115) is used whereas in the latter case the generator is connected to the bending head (101). In a final embodiment, Fig. 7 (not shown), the clamping carriage (103) forms part of a linear motor whose field (121), (122) is set up selectively by a set of energizable segments (123).