Patent GB-386313-A (GB)
Title: Improvements in or relating to cutting mechanism for use in printing machines
IPC: B41F13/60
Filed: 1931-06-05
Abstract: 386,313. Cutting webs. HOE & CO., Ltd., R., 109, Borough Road, London.- (Assignees of Tomlin, J. R.; 910, East 138th Street, New York, U.S.A.) June 5, 1931, No. 16514. Convention date, Nov. 3, 1930. [Class 31 (i).] In rotary apparatus for cutting a printed web into sheets and folding the sheets either singly or collected, each cutting knife is operated so that it remains substantially radial to the folding-cylinder during the cutting operation. In one arrangement, Fig. 3, two knives 33, 34 are arranged on the cutting-cylinder 30 which is driven by gearing 49, 50 from the folding and collecting cylinder 29. The knife-boxes 35 are pivotally mounted at their ends 36, Fig. 5, and are each connected by a lever 42 and link 41 to a spring-controlled arm 40 carrying a roller 39 running on a fixed box-cam 38 so designed that the knives are rocked relatively to the cutting-cylinder 30 and remain radial to the folding-cylinder during the cutting operation. The knives can thus enter the web to a greater depth and may be provided with a diagonal edge. The abutments on the folding cylinder which co-operate with the knives 33, 34 each comprise a slotted rubber-block 122. In a modified construction for imparting the rocking and radial movement to the cutting knife and arranged for use where only a single knife is employed, the knife-carrying frames 179, Fig. 11, are keyed to a spindle 180 rotatable together with arms 182 pivoted on spindles 184 mounted on a rotary head 185 on a fixed shaft 196 and driven by gearing 187, 188 coupled by intermediate gears to a gear 194 on the folding-cylinder 195. By means of spring- pressure 206 on one face and a set-screw 209 on the other face, the arm 182 is coupled to an extension 203 of the frames 179. The knife is maintained radial to the folding-cylinder by means of a rod 213, fixed to a projection 212 on the extension 203 and slidable in sleeves 214 integral with an eccentric strap 215 rotatable on a fixed eccentric block 190. This construction may be adapted for cutting alternate sheets of slightly different length by interposing an eccentric bush between the strap 215 and the block 190, this bush being rotated from the gear 194, Fig. 11, through intermediate gearing. In order to ensure that the knife engages its abutment correctly, the frame 179 is formed with a projection 179a which is engaged by a roller 179b on the folding cylinder adjacent to the cutting position. In another construction, Fig. 18, the knives are given the required movement by gears 217 fixed to the ends of the knife-boxes 216 and meshing with gears 218 engaging a stationary gear 219 bolted to the main framing. According to the Specification as open to inspection under Sect. 91 the rod 213, Fig. 11, may be dispensed with, and the knife maintained in its radial position by a pinion interposed between the arm 182 and the head 185 on the spindle 184 and adapted to engage a pinion fixed to the stationary shaft 196. Further, at the ends of the knife-abutment block 122, are arranged curved members facing in opposite circumferential directions and communicating with the tubular interior of the block so that as the cylinder rotates a current of air is set up in the block and removes paper dust deposited therein. In addition, the Specification included the description of sheetfolding and associating apparatus now described and claimed in Specifications 384,680, 386,003, and 386,004, [all in Group XVI]. This subjectmatter does not appear in the Specification as accepted.