Patent GB-703998-A (GB)
Title: Conveyor for sheet material
IPC: B21B39/00
Filed: 1951-01-12
Abstract: 703,998. Conveyers. AETNA-STANDARD ENGINEERING CO. Jan. 12, 1951 [Aug. 19, 1950], No. 932/51. Class 78 (1) [Also in Group XVI] Metal sheets are fed on to a receiving conveyer 16 at a speed greater than that of the conveyer whereby the sheets are deposited thereon in partially overlapping relation, and to give longitudinal stiffness to said plates during transfer a curved plate 60 is adapted to bend the sheets laterally into upwardly concave form whilst means co-operating with the curved plate exerts a force on the trailing portions of the sheets to urge them downwardly into contact with the conveyer. The lateral bending is imparted to each sheet, as it passes from conveyer 15 to the slower conveyer 16, by means of the plate 60 which is flat at 71 towards its rear end 70 which is bent downwardly to guide the sheets on to it, and at its front end 75 is bent laterally to a flat V-shape, the intermediate portions being progressively more bent from the rear to the front of the plate. The sheets pass from conveyer 15 through a pair of burr-masher rolls 62 driven at the same speed as conveyer 15 through a sprocket connection on to the plate 60 and are held to the plate 60 by a magnet 80 underneath. This magnet is preferably an electromagnet which can be de-energized when the conveyers are travelling at a slow speed since it is then not necessary and might cause sticking. A thus longitudinally stiffened sheet 52 upon leaving the plate 60 drops in overlapping relationship with the previous sheet 51 on to the second conveyer 16 whereas the following sheet 53 remains spaced from the sheet 52. A magnet 49 urges the trailing end of a falling sheet downwardly on to the conveyer so as to slow the sheet to the speed of the second conveyer and also to move this trailing end clear of the leading end of a following sheet which is to overlap it. The plate 60 is vertically adjustable in slots 66. As applied to a shear line as disclosed in Specification 651,843 the shingling plate 60 is interposed between the first two conveyers of the on-gauge flight, the first conveyer travelling at about 1,066 feet per minute and the second at about 650 feet per minute. A similar plate to the plate 60 is inserted between the first two conveyers of the reject flight but in this case the burr-masher rolls 62 are replaced by a single rubber-covered roller arranged above the end roller of the first conveyer. An electromagnet is also arranged below the second shingling plate and is indicated at 92 in Fig. 8, which shows a circuit for controlling the magnets 80, 92 in accordance with the speeds of the conveyer belts. 97 is a rheostat for controlling simultaneously the speeds of all the conveyer belts in the system and its operating shaft 95 has on it two cams 98, 99 which switch the magnets 80, 92 on or off according to the rheostat setting by the trip switches 100, 101, so that the magnets are de-energized below a certain speed of the conveyer belts. The cams and trip switches. may be replaced by rheostats for varying the current supply to the magnets 80, 92. Specifications 690,344 and 690,347, [Group XVI], also are referred to.