Patent GB-243313-A (GB)
Title: Improvements in devices for feeding paper webs to printing machines
IPC: B65H19/18
Filed: 1925-09-04
Abstract: 243,313. Fallot, (neÚ Huschke), M., (Representative of Fallot, A.). Nov. 22, 1924. [Convention date]. Feeding and registering webs.-Relates to means for feeding and renewing the web rolls of printing-machines. In one form, Fig. 1, the bearings d, which support the spindle p of the web roll, are mounted on vertical screwed shafts r geared to a cross shaft f operable by hand or by an electric motor to lower the bearings to receive a new roll or to raise them to keep the roll in contact with a feeding belt u. Arranged above the bearings d are additional bearings a slidable in guides carried by the standards s and held in the position shown by springs a<1>. When the roll is nearly exhausted, the ends of the spindle p engage inclined parts a<2> on the bearings and press back the bearings, which are thereupon returned by springs a' to retain the roll. The bearings d are then lowered to receive a new roll and again raised to bring the gummed surface of the roll into contact with the old web to effect the join. The old web is then severed and its spindle discharged. This is effected by turning a handle c<1> on a shaft c<2> which carries pinions c in mesh with racks formed on the bearings a<2>, and also a cam e engaging an arm g of a bell crank lever the other arm of which carries a knife. As the shaft c<2> is turned the cam permits the bell-crank to be turned by a spring g' to sever the web, and at the same time the bearings a<2> are withdrawn to bring the ends of the spindle p against fixed stops n which thus push the spindle out of the bearings. The discharged spindle is received in bearings b<1> at the front of guide members b. In another form, Figs. 6 and 7, the raising and lowering of the web roll is effected automatically, and means are provided for adjusting the roll laterally. The main bearings dare carried by vertical screwed shafts r provided at their upper ends with worm wheels r' engaged by worms on a cross-shaft f which may be turned by a reversible motor m or by chain gear operated by the roll spindle p. This chain gear drives the shaft through a clutch f<1> operated by a solenoid f<2> which is controlled from the upper switches, so that when the motor is in operation the chain gear is idle and vice versa. The motor is controlled from a switch board h and also by upper and lower switches h<1> in the path of projections h<2>, h<3> on the bearings d, so that when the nearly exhausted roll is transferred to the upper bearings a the motor is started and the bearings lowered to receive a new roll. When the bearings reach their lowest position the lower switch h<1> is operated to stop the motor. The chain gear for raising the roll automatically as the web is unwound comprises a pinion o<1>, Fig. 6, secured to or formed on the spindle p, meshing with a pinion o<2> to which is secured a chain wheel o<3> engaging a chain o which passes round chain wheels o<4> and is operatively connected to the shaft f by gearing o<5> and the clutch f<1>. Lateral adjustment of the roll may be effected by a member i<3> angaging a slot in the spindle p and traversed by a screw i. The roll is held in the adjusted position by a tongue f engaging grooves t' in the spindle. The driving belt u is tensioned by a weight k<3> connected to the upper sliding bearings k<2> of the belt. In another form, the rolls are traversed horizontally on screwed shafts instead of vertically. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a further form, Fig. 11 (Cancelled), in which the new roll is placed on the bearings d carried by the screwed shafts r, which, when the roll is nearly exhausted, are operated first to raise the roll to transfer it to the upper bearings a and then to lower the bearings d to receive a fresh roll. Additional bearings d<1> may be provided to receive the roll while it is being unwound. It is also stated that, instead of feeding the web by a belt, friction discs, kept in engagement with the roll surface by means of cams, may be employed. This subject-matter does not appear in the Specification as accepted.