Patent GB-232712-A (GB)
Title: Improvements in or relating to machinery employed in the manufacture of tin-plates, sheets or the like
IPC: B21B47/02
Filed: 1924-02-02
Abstract: 232,712. Melingriffith Co., Ltd., Thomas, H. S., and Davies, W. R. Feb. 2, 1924. Addition to 181,844. Angular bending.-In an apparatus for doubling or folding plates, sheets or the like, particularly for the production of " black plates " in the manufacture of tin plates &c., by applying endways pressure to the plates &c. as described in the parent Specification, one or more hooks or arms adjustable with relation to the level of the bed over which the plate travels are used to engage the front or irregular edge of the plate so that the amount of overlap between the ends of the plate after folding is adjustable and the amount of scrap metal produced when the plate is subsequently trimmed is reduced to a minimum. The front edge of the sheet X or multipleply of sheets is placed on a hook 18 on a rod 18<a> which is adjusted in guides 19 by a crank 20 and hand lever 22 and held in position by a rack 23. The bending member 9 which has a shoe 40 to prevent the rear straight edge of the plate in contact therewith from rising, is provided with rollers 9<a> engaging guide bars 10, 10<a> and is traversed over a fixed bed 25 bv an hydraulic ram or by two pairs of chains 11, 14 driven by an electric motor 17. Just after the commencement of the bending operation two pivoted flaps 24 are automatically brought down to engage the forward end of the plate to prevent it from rising. These flaps are pivoted at 26 and connected by brackets 24<a> and links 27 and a rod 29<a> to the lower arms of counter-weighted bell crank levers 28 which are provided with extensions 28<b> one of which is preferably connected by a link 31 with a tappet rod 30 reciprocated in guides 30" on the under side of the bed. A lever arm 39 passes through a slot 30<b> in the end of the tappet rod, the arm being mounted on a shaft 38 carrying also a slotted crank 37 with which engages a pin on a lever 35 pivoted to the standard at 36. This lever 35 is pivotally connected to a bar 34, to which is adjustably connected an arm 32 and to which is also pivotally connected a lever 33 itself adjustably pivoted at 33<a> to a bracket 10<b> secured to the frame member 10<a>. The arm 32 and lever 33 have pivoted sections 32<a>, 33<b> provided with pins 32<b>, 33<c> so as to be rigid with the arm and lever during the operative movement of the member 9 but movable relatively thereto in the rearward movement. When in the forward movement of the member 9 a bar 9<b> fixed thereto engages the section 32<a>, the bar 34 is pushed forward and raised so as to move the lever 35 and thus retract the tappet rod 30 to bring the flaps 24 over the end of the plate. The bar 9<b> passes under the section 32<a> and during the bending engages the section 33<b> whereupon the tappet rod is pushed forward again and the flaps 24 raised. The bar 9<b> then passes under the section 33b and the member 9 completes its forward motion to double the plate. The plate is then raised by fingers 45 on a pair of chains into the pass between a pair of rolls 41, 42 the rolls 41 of which may consist of a series of discs or wheels. It may pass thereto between a pair of guides 53, one of which is hinged to the frame, so as to prevent the plate from falling backwards when the member 9 recedes, or the faces of the standard 8 and members 9 may be inclined for this purpose. The chains 43 are driven by chain gear 44b from the shaft of the roll 42 which is geared to a third roll 42a driven by chain gear 12e from the shaft of one of the chains 11 for traversing the member 9. The doubled sheet in passing through the rolls 41, 42 is deflected by a plate 57 on to an inclined platform 56 from which it slides down to enter the pass between the rolls 42<a>, 42 which complete the folding operation. In order to prevent undue friction between the longitudinal edges of the plates and their longitudinal guide bars 46, 47, the bars are spaced apart a distance slightly greater than the width of the plate and in order that the lower ends are gripped near the completion of the folding operation the guide 47 or a portion thereof is pivoted a.t 48 and is turned inwardly automatically. This may be effected by the member 9 engaging an inclined portion thereon, or by a lateral arm 9<c> on the member engaging an inclined slotted lever 49, which is connected by a pin 51 and links 51<a> to a pivot 52 carried by a bracket on the guide 47.