Patent GB-1500659-A (GB)
Title: Clamping and feed apparatus for a cold saw
IPC: B23D51/20
Filed: 1976-09-07
Abstract: 1500659 Sawing KEURO MASCHINENBAU GmbH & CO KG 7 Sept 1976 [19 Sept 1975] 36931/76 Heading B5L A clamping and feed apparatus for a workpiece 7 to be cut by a cold saw comprises a machine table 6 on which the workpiece rests during the cutting operation, mutually opposed clamping jaws 8, 9 at least one 9 of which is adjustable to accommodate the workpiece and the other of which is obliquely raisable in relation to the machine table to release the workpiece, and a feed roller 29 for feeding the workpiece in the region of the jaws, the feed roller being raisable from a position below the surface of the table simultaneously with the oblique raising movement of the jaw 9 to allow feeding of the workpiece. The cold saw may be a circular saw or band saw or, as described, a frame saw having a blade 5 in a saw frame 4 guided by a housing 3 in side members 2 of a frame 1 formed with a machine table 6. The workpiece 7 may be supplied to the machine by a rollway 10 having driven rollers 11. The saw frame is pivotable between an upper initial position determined by engagement of a stop 51 with an adjustable limit switch 52 and a lower position at the end of a cutting operation determined by a limit switch 50 which, when actuated, returns the saw frame to its upper position. The jaw 9 is adjustable to the size of the workpiece by means of a spindle 12. The jaw 8 effects the clamping and release of the workpiece and is in the form of a housing 14 mounted for oblique displacement by guides (15, 16, Fig. 4, not shown) on a block 13 secured to the machine frame 1. The block is formed with a cylinder 19 having its axis parallel to the guides and receives a piston 20, the rod 21 of which is connected to the housing of the jaw. Dish springs 22 act on the piston to urge the jaw to its clamping position and pressure mechanism can be supplied to the cylinder to raise the housing obliquely and release the workpiece. The housing is formed with extensions 26, 27 in which is rotatably mounted an extension 29 of the feed roller 28 for movement with the jaw 8, the roller being below the surface of the table 6 when the jaw is in its clamping position and slightly above the surface when the jaw is in its obliquely raised retracted position. In the latter position, the roller to be rotated by a chain drive 30 from a motor 23 to effect feed of the workpiece to a position determined by a stop 42. The motor also drives a pump 24 for supplying pressure medium to the cylinder 19 so that the roller is driven simultaneously with the withdrawing of the jaw 6. The stop 42 is normally in a retracted position to enable a cut workpiece to fold without hindrance. At the end of a cutting operation, operation of the limit switch 52 upon raising of the saw frame actuates the motor 23 which causes rotation of the feed roller and the pump to not only cause the withdrawing movement of the jaw but also to actuate a piston in a cylinder 60 to advance the stop 42. When the workpiece engages the stop, a limit switch therein stops the motor for effecting the clamping movement of the jaws and lowering and stopping of the feed roller. A spring pressed-counter roller 34 is mounted on an adjustable plate 35 above the feed roller, the plate being carried by an arm 33 from the housing 14.