Patent GB-1136791-A (GB)
Title: Improvements in or relating to the cutting of sheet material
Inventor: BASTABLE JOHN SIDNEY
IPC: B26D7/06
Filed: 1965-02-12
Abstract: 1,136,791. Cutting-out presses. SAMCO -  STRONG Ltd. 10 Feb., 1966 [12 Feb., 1965; 2 Dec., 1965], Nos. 6121/65 and 51140/65. Heading B4B. An assembly for use in cutting sheet material from a supply of indefinite length comprises a press having a beam and a bed mounted for relative movement of approach and separation whereby sheet material fed therebetween can be cut by means of a knife mounted on the beam, a feed table movable between a retracted position, in which an outfeed portion of the table is positioned between the beam and the bed, and an advanced position, in which an infeed portion of the table is positioned between the beam and the bed, means for clamping the sheet material to the feed table when the table is moved from its retracted position to its advanced position whereby, when the assembly in in use, a portion of sheet material on the infeed portion of the table is carried between the beam and bed of the press for a cutting operation to be performed thereon, and means mounted on the beam and effective, when the table is moved from its advanced to its retracted position, to retain the sheet material carried by the table against movement with the table, whereby, when the assembly is in use, material on the infeed portion of the table is transferred to the outfeed portion thereof. In one assembly, Fig. 1, the beam 10 is movable towards and away from the bed 8 and comprises a rearward extension 12, a friction pad 16 of foam rubber extending over a downwardly facing surface of the beam and the extension. A portion 18 of the pad extending widthwise of the beam is of less compressible material than the remainder of the pad and is effective, when the table 2 is moved from its advanced to its retracted position, to restrain the sheet material S from movement with the table. A knife 14 is mounted on the beam and extends through the pad 16. A cut portion Sl is disposed on the outfeed portion 19 of the table. In operation, a lay of sheet material is fed on the table in its retracted position, Fig. 1, and clamped by a member 20 on the infeed portion 21 thereof. The table is then moved to its advanced position, Fig. 3, to move an end portion of the lay on the portion 21 of the table between the beam and bed of the press and the beam is then moved downwardly to cause the knife to cut a further portion S<SP>11</SP> from the sheet material. The beam is then moved from the bed sufficiently to relieve pressure on the sheet material while retaining the material in frictional engagement with the pad 16 and the clamping member 20 is released. While the material is thus retained in frictional engagement, the table 2 is moved from its advanced to its retracted position to carry the portion 19 thereof between the beam and the bed. The beam is then moved away from the bed and the portion S<SP>11</SP> is thus left on the portion 19. In a subsequent cycle, the portion 19 with the portion S<SP>11</SP> thereon is moved beneath the extension 12 and is pressed thereagainst when the beam is moved downwardly, the pressure thereafter being relieved. The table 2 is then withdrawn and the movement of the beam away from the bed completed to feed the portion S<SP>11</SP> on to a self-levelling table of a stacking device 6. In another assembly, Fig. 7, the bed 8<SP>1</SP> is movable by toggle means towards and away from the beam 10<SP>1</SP>, the beam comprising a rearward extension in the form of two spaced arms 34 supporting a carrier bar 36 adjustable lengthwise of the arms. Yieldably mounted on the bar 36 for movement heightwise thereof and spring-urged downwardly relatively thereto is a clamping bar 38 and a separator bar 40. The bar 38 restrains the sheet material S from movement with the table 2<SP>1</SP>, when the table is moved from its advanced to its retracted position. The bar 40 is arranged, after the table has been moved to its retracted position, to move downwardly relative to the bar 38 to separate a cut portion S<SP>1</SP> of the sheet material from the remainder. The bar 40 operates progressively from one side of the sheet material to the other. A stacking device 6<SP>1</SP> is arranged to receive cut portions of sheet material from the portion 19<SP>1</SP> of the table 2<SP>1</SP> when the latter is moved from its advanced to its retracted position. The device 6<SP>1</SP> comprises a table 48 supported on a carriage 50 which is movable heightwise of a column 52 mounted on a bracket 54. The column 52 houses an hydraulic cylinder 60 in which a piston is movable, the piston-rod 62 carrying at its upper end a sprocket 64 over which extends a chain 66 one end of which is secured to the carriage 50 and the other end of which is secured to the base of the press 4<SP>1</SP>. Thus when, in the operation of the assembly, the bed 8<SP>1</SP> is raised towards the beam 10<SP>1</SP>, the stacking device is raised and in addition, the table 48 is moved relative to the column 52. By admitting oil under pressure to the lower end of the cylinder 60, the table 48 can be raised to bring the upper surface thereof immediately beneath the table 2<SP>1</SP> when the latter is in its advanced position. When upward movement of the table 48 is arrested by engagement with the table 2<SP>1</SP>, the sprocket 64 is also restrained from further upward movement in response of continued upward movement of the carriage 50. Waste passes through channels 72.