Patent GB-694760-A (GB)
Title: Machine for wrapping sheet material about a core
Inventor: NOE HAROLD COOPER
IPC: B43K19/16
Filed: 1951-07-11
Abstract: 694,760. Covering cores by winding. DIXON CRUCIBLE CO., J. July 11, 1951, No. 16485/51. Class 109. A machine for wrapping sheet material about a core comprises an endless belt, a pair of rollers for supporting and driving the belt, means for. feeding a sheet of the material to a predetermined position with relation to the belt, control means for moving the rollers relative to one another to vary the space between them, means which engage and form one end of the sheet and the belt into a pocket between the belt supporting rollers as the rollers move together and means for discharging the core into the pocket while the rollers are moving together so that when the rollers are in the closed position and are rotated the sheet material is wrapped about the core. The endless belt dips into a trough of adhesive and may be formed with pockets to carry the adhesive material. The sheet material may be paper and the core of graphite so as to manufacture "lead" pencils or the core may be of rubber. Paper sheet P is fed along a platform 32, Figs. 4 and 5, by a pair of rollers 30, 31, the upper of which 30 is spring urged into engagement with the lower roller 31 the drive to which includes a cam actuated clutch which disconnects the drive when the paper is in position and an overdrive clutch to allow the paper to be withdrawn between the rollers during the succeeding operations of the machine. The paper is fed to a position where one end protrudes above the pair of rollers 34, 35, over which and over another pair of rollers 38 and 39, Fig. 4, travels the endless belt 33. The lower rollers 38, 39 extend into a trough 7 containing adhesive and are mounted on a lever 165. The shaft 168 of roller 38 is mounted in fixed bearings and the lever 165 pivots about this shaft. In timed relation with the other mechanisms of the machine the lever 165 is reciprocated so as to maintain appropriate tension on the belt during the wrapping and pocket forming operations. The roller 34 rotates in fixed bearings and roller 35 is mounted on a pivoted arm 37, which, through a cam actuated mechanism, is retracted to the left (Fig. 5) at the end of the paper feed cycle. In this position, a plunger 250, 251 presses the paper on to the belt and forms a pocket into which the core is dropped. Simultaneously with the retraction of roller 35 to its left hand position, a brake 246 is brought to bear against the paper feed roller 31, the brake mechanism being operated from the same drive shaft 171 which retracts the roller 35. The cores 117 are stored within a hopper 110 continuously oscillated by a lever 150 and are fed into a guideway 125 at the bottom of which mounted on a shaft 130 are a number of notched collars 136 which are rotated at the appropriate intervals to deposit a core in the pocket formed and vacated by the plunger 250. The individual collars 136, Fig. 7, are individually rotatably adjustable so as to accommodate cores of different sizes. After the core has entered the pocket, roller 35 is returned to its right hand position and the rollers 34 and 35 are rotated so as to wrap the paper about the core. Rollers 225 and 226 hold the belt 33 in driving engagement with the rollers 34 and 35. At the completion of the wrapping cycle, the finished pencil is raised on the belt by the retraction of roller 35 and rolls on to fingers 268 and 269 formed on blocks 266 and 267 from which it is ejected in the direction of the arrow, Fig. 2, by a cam actuated mechanism operating levers 275, 276 and 278 which cause a block 280 to slide along guideways 282 and a rod 284 attached to the block 280 to eject the pencil, a member 285, 286 being attached to the end of rod 284 for this purpose. The pencil is ejected through a die member 291 which scrapes adhesive from its surface. A clutch manually operable by a lever 306 is provided to disconnect the paper feed, core feed, pocket former and ejector mechanisms from the main machine drive.