GB665357A - Improvements in or relating to winding up sheet material into rolls - Google Patents

Abstract

665,357. Winding and reeling. BRITISH UNITED SHOE MACHINERY CO., Ltd., CLARK, K. J. B., and BANCROFT, K. W. Nov. 3, 1949 [Nov. 4, 1948], No. 28638/48. Class 83 (iv). [Also in Group XVI] Relates to a rotary former on which strip material may be wound up into a roll and consists in magnetic means for gripping the leading edge of the strip during winding. Sheet material is fed from a roll to rotary knives which slit the material longitudinally into strips which are then rewound on a former F. The former F, Fig. 2, comprises an elongated portion 27 of aluminium provided with end portions 55, 57 which support a cylindrical body portion 59 rotatable a limited amount relatively to the portion 27. The portion 27 carries a number of powerful U-shaped permanent magnets secured in a longitudinal slot 83, the N and S poles of the magnets facing outwardly. When the magnets are brought into a position opposite high permeability inserts 89, 107 in the portion 59, and a bar device B of soft iron is laid along a flat surface 109 on the former F, the leading edge of the material being gripped between the flat surface and the bar. The bar B is retained against anticlockwise movement by a fixed pin at the left-hand end of the portion 59, as seen in Fig. 2, and a movable spring-pressed pin mounted for sliding movement within the right-hand end of the body portion. The bar, Fig. 8, comprises a housing 127 having a guideway along which a cam member 129 may slide by movement of a handle 141 relatively to a handle 139 secured to the housing 127. The member 129 is provided with recesses 143 having cam faces 145 which are engaged by studs 147 secured to a strip 131, such that the bar may assume a contracted condition in which the studs 147 occupy the recesses 145, or an expanded condition in which the studs 147 rest upon member 129. The condition of the bar may be altered by causing relative sliding movement between the handles 139 and 141. In operation, an unslit leading edge of the material is wrapped around the former F beyond the flat surface 109 and the device B in its expanded condition placed on the surface 109, such that the strips beyond the unslit edge will be gripped between the device and the surface. The unslit leading edge is then cut off and the former F rotated whereupon the material is progressively slit and rewound to form narrow rolls on the former F. When sufficient material has been wound the former is stopped and the body portion 59 rotated relatively to the portion 27 to move the magnets away from and so release the device B which is then moved into its contracted condition in order that it may be removed from within the rolls. The former F is then removed from brackets 31 and 37 by releasing a pin 43 from a slot 45 in an extension 35 rotatable in the bracket 37 and then swinging the axis of the former about the axis of a stud 39 pivotally mounted in the bracket 31. The rolls are then removed from the right-hand end of the former F, the movable pin being depressed into the body portion to permit their removal.