Patent GB-108719-A (GB)
Title: Improvements in and relating to Sheet Feeding, Gumming and Transporting Mechanism.
Inventor: ALEXANDER ALBERT EDGAR
IPC: B65H29/04
Filed: 1916-08-17
Abstract: 108,719. Alexander, A. E., (Stokes & Smith Co.). Aug. 17, 1916. Coating and damping machines.-In gumming- apparatus having two gum-applying rolls with spaced gum-applying surfaces, the applying-surfaces of one roll being opposite to the spaces between the applying surfaces of the other roll, a transporting mechanism is employed including grippers which sieze a sheet adjacent to one roll and carry it past the other roll, passing through the spaces between the applying-surfaces of the second roll. The bottom sheet of a pile of sheets 19 is fed to gumming-apparatus by means of a suction roll 21, the table being reciprocated by means of a segment 25 and rack 26 under the action of springs 22 attached to bands 20, the other ends of which are attached to the table 16. The sheet passes between feed-rollers 35, 36, and over gumming-rolls 44, 43 having recessed parts, the recesses in one roll being opposite the raised parts of the other so that the sheets are completely gummed. Fingers 46, 47 carried on bars 48 prevent the sheets from curling round the rolls. The rolls 44, 43 rest on a gum-distributing roll 42 which receives gum from a roll 41 in a gum pan 7. The gum pan 7 carries the feeding mechanism above described, and is provided with wheels 10 on tracks 6. The gum pan is held in operative position against stops 15 by pivoted bars 12 and wedges 13, but when it is desired to remove the rolls for cleaning, the bars 12 are swung upwards, when the pan 7 can be moved into the position shown in dotted lines in Fig. 1 so that the rolls can be lifted out of their open bearings. The sheet from the feed-rolls 35, 36 is gripped by grippers 58, Fig. 6. on gripper bars 55 carried by endless chains 53 passing around sprockets 54 on the main shaft 5 which also carries a roll 49 having one or more blankets 50 of yielding material of the same shape as a sheet 19 and adapted to support the sheet while it is being gummed. The grippers 58 are operated through toes 59 by a cam 60 on a, side frame member, the operation being effected by rocking a shaft 57, Fig. 6, the shaft being held in its closed or open position by a spring pin 61. If a sheet is not fed, the gum pan is lowered so as to bring the gum rolls away from the blanket 50 by means of a movable track section 6<a> in the track 6, which is lowered for instance by toggles 65, links 66, and levers 69, 70. The lever 69 can if desired be worked by hand, and any means may be used to operate the lever 70 automatically. The means described consists of a cam 73, Fig. 2, which depresses the lever 70 by means of a roller 77 when the roller 77 is pulled into the path of the cam by the energization of an electro-magnet 74, the armature 75 of which carries the roller 77. The circuit of the magnet 74 is completed when the feed-rolls 35, 86 contact with one another in the absence of a sheet. The sheets after gumming are carried by the grippers on the chains 53 to any desired point, preferably a part of a packing-machine, and are released by means of a cam 60<x>, on the standard which carries the upper chain wheel 56, Fig. 7, which acts upon a toe-piece 59<x> to rock the shaft 57 in the opposite direction.