Patent GB-191216993-A (GB)
Title: Improvements in Machines for Gumming, Folding and Perforating Letter Cards.
IPC: B43M5/04
Filed: 1912-07-22
Granted: 1913-07-22
Abstract: 16,993. Dorman, J. E., and Dorman & Co., W. H. July 22. Envelopes and the like, making.-Relates to a machine for gumming, folding, and perforating letter cards. The cards are placed in a pile on a table b<6>, Fig. 1, which is pressed upwards by a spring, but is held by means of a pawl which engages a ratchet on the stem b<7> of the table. A gummed picker c descends on the top card and gums it along one end and half-way along each side, as shown in Fig. 22. During the time the picker is in contact with the top of the pile, the pawl holding the table is lifted out of engagement with the ratchet by a cam, but re-engages it, as described in Specification 16,319/08, just after the beginning of the up-stroke of the picker, thus maintaining the top of the pile at approximately the same level. As the picker with a card adhering reaches the top of its stroke, a rubber-covered plate f, Fig. 7, moves under it and it then descends and presses the card against the plate f. The front half of the card overhangs the plate, and is supported by fingers which are moved inwards. Grippers next seize the end of the card and draw it with a wiping action off the picker and deposit it in one of the divisions of a drying-chain i<5>, Fig. 1. the run of which may be either vertical or horizontal. The picker is gummed by a distributing-roller e, Fig. 7, which receives gum from a rotating roller d<1> resting in the gumming-trough d. The roller c which is positively rotated while in contact with the roller d<1> reciprocates across and in contact with the face of the picker, and a gear-wheel secured on its shaft engages a fixed rack, thus rotating it positively while it is in contact with the picker. The drying-chain advances step by step and discharges the dried card between rolls j, j<1>, Fig. 1, which feed it against a stop j<18> on a table j<4> where it comes to rest with its centre lying exactly over a slot in the table. A folding-blade j<20> descends on the card and thrusts it down through the slot and between pressing-rolls j<15>, Fig. 12. The card thus folded across the middle, falls on to a stop plate k in front of the perforating- device. The folding - plate j<20> has a finger pivoted to it which makes contact with the card in advance of the blade and pushes it against a shaft on the table j<4>. A stripping-plate o<2> next advances and presses the folded card x<3> against the perforating-bed o. The perforating-pins o<5> now advance and passing through holes in the stripping-plate o<2> perforate the card. The stripping-plate and pins next retire from the perforating bed o carrying the card on the pins and finally the stripping-plate o<2> is thrust forward by springs and pushes the card off the pins. The card falls on to an endless band or chain q, Fig. 1, which is advanced periodically by a pawl q<7> and a counting-device. The counting-device consists of a toothed wheel q<9> secured on the shaft q<6> of one drum of the band q, and a second wheel mounted loosely on the shaft q<6> alongside the secured wheel. This loose wheel has all its teeth uniform except one, q<16>, Fig. 25, which is nearly double the length of the others, and is of the same length as those in the secured wheel. The pawl q<7> covers both wheels and reciprocates between the two positions shown in Fig. 25, its stroke being long enough to take one tooth of the secured wheel but not quite long enough to take two teeth of the free wheel. The pawl is thus prevented by the free wheel from advancing the secured wheel until the long tooth of the free wheel comes beneath the pawl. The band q is thus advanced one step for every complete revolution of the free wheel and the cards, folded and perforated as shown in Fig. 24, are conveyed from the machine in counted batches on the hand q. Specification 21,953/91, [Class 146, Writing- instruments &c.], is referred to.