Patent GB-889692-A (GB)
Title: Improvements in or relating to machines for forming fold lines in boards or sheets
Inventor: KIRBY WILFRED
IPC: B31B50/25
Filed: 1958-09-17
Abstract: 889,692. Creasing machines. VICKERSARMSTRONGS (ENGINEERS) Ltd. Sept. 16, 1959 [Sept. 17, 1958], No. 29764/58. Class 100(2) A machine for creasing board or sheet blanks of fibrous materials, e.g. in the manufacture of boxes or the like, includes a unit comprising a first rotary forming member having a peripheral edge for contacting one side of a blank and two other rotary forming members having peripheral edges for contacting the opposite side of the blank at locations disposed at either side of the peripheral edge of the first forming member, there being for each of the two other forming members a separate pivoted spring-loaded mounting arranged to support the forming members for resilient displacement relatively to the first forming member to accommodate different thicknesses of blanks. As shown the machine comprises one or more pairs of upper and lower carriages 7, 8 which are mounted on a pair of parallel, horizontal beams, of which one only is shown at 5, whereby the position of the unit may be adjusted in a direction transverse to the direction of movement of the blanks. The carriage 8 has a roll 14 mounted thereon constituting the lower forming member, a key 19 on the roll slidably engaging in a keyway 18 in a driven shaft 17. The roll 14 has a circumferential rib 15 flanked by cylindrical shoulders 16. The carriage 7 has side plates 22 (shown cut-away in Fig. 3) and 23 connected by a spacing plate 24 and a distance piece 26, the side plates tapering to a point at their lower ends. A horizontal plate 29 is slidably mounted between the side plates 22, 23, guide pins 32 being slidable in vertical holes in the plates 24, 29. Two carrier members 36 are pivoted at 35 to the plate 29 and are formed at their lower ends with laterally projecting toe portions 37 and upwardly directed ledges 38. Locating pins 39 extend upwards from the ledges 38 and engage. the lower ends of compression springs 40 whose upper ends abut against collars formed on the guide pins 32 near their lower ends. Disc-like upper forming members 9, 10 are mounted for free rotation on the toe portions 37 of the carrier members 36, the lower edges of the members being adjustable towards and away from each other by rotation of a wheel 54 projecting through slots 55 in the side plates 22, 23. The wheel 54 is secured in the middle of a screw 53 having threaded portions which engage in nuts 52 pivotally secured to the carrier members 36. The peripheries of the forming members 9, 10 are shaped as shown in Fig. 5 and have two bevelled portions 48, 49. When no blank is between the forming, members the bevelled portions 49 rests on the cylindrical shoulders 16 of the roll 14, and the upper ends of the pins 32 are slightly spaced from the lower edge of the beam 5. When a blank is fed between the upper and lower forming members, the parts 9, 10, 36, 29 are moved upwards as a unit; after the upper ends of the pins 32 abut against the beam 5 further upward movement of the aforementioned parts results in compression of the springs 40. In operation the rib 15 forms the centre of the crease, the members 9, 10 pressing down the blank on either side thereof. Specification 745,171 is referred to.