Patent GB-429520-A (GB)
Title: Improvements in or relating to delivery apparatus for folding, printing and like machines
IPC: B65H31/12
Filed: 1934-01-11
Abstract: 429,520. Delivery apparatus for printing and like machines. GRIFFITH, M. J., Prujean Square, Old Bailey, London. Jan. 11, 1934, No. 1090. [Class 100 (i)] In sheet-delivery apparatus for folding, printing, and like machines, a work table is provided which can be moved downwards under its own weight, or by weights or other means, and the lowering of which is controlled by electrical means, operable through a circuit embodying a pair of contacts or a selenium or photo - electric cell, so arranged that as the pile of work increases, the contacts are, or cell is actuated to cause the energizing of the electrical means and allow the table to move downwards a predetermined distance each time such actuation takes place. The sheets are delivered by rollers 1, 1<g>, Fig. 1, to a table 4 which is carried by brackets attached to tubular guides 4<c> having rollers 4d slidably engaging vertical posts 5. The table 4 is connected to one or more endless chains 6 passing over sprockets 7, 8, of which the former are vertically adjustable, and the latter are formed as free-wheels, so that the table can be raised without rotating the sprockets 8. One sprocket 8 is connected through reduction gearing to a ratchet wheel 10 formed with one or more teeth to be engaged by a spring catch 11 which carries the armature 11<c> of an electromagnet 15, and a governor may be incorporated for regulating the speed of the gearing. A cross frame 16 adjustably supported on the posts 5 carries a rod 17 on which is mounted a fixed contact 21 and a slidable member 18 carrying a rockable lever 19 forming a movable contact, the separation of the two contacts being limited by a stop 17<a>. The lever 19 is loaded by adjustable weights 19b and the curved upper portion carries a shield 19<c> which serves as a guide for the delivered sheets. The contact members are insulated from one another and are in the circuit of the electromagnet 15, so that as the pile of delivered sheets increases, the contact 19 is raised until it engages the contact 21 to energize the electromagnet 15, attracting the catch 11 out of engagement with the ratchet wheel 10, which is thus freed and allows the table 4 to fall under its own weight. The contacts 19, 21 are thereby opened and the catch 11 moves forward to re-engage the wheel 10 as the next tooth thereon or the same tooth 10<a>, when only one is provided, arrives opposite the catch. A normally closed contact in the electromagnet circuit may be opened when the table reaches its lowest position and other contacts may be provided to give an alarm or to stop the machine. The supporting frame for the delivering table may have square cross-bars 26 or pin-wheels positioned to engage the sheets in stacking and the table 4 may be provided with usual front and side stops, the latter being carried on rods adjustably mounted in members slidably on the posts 5. Smoothers 29 having bent ends 29<a>, Fig. 6, may be provided, hingedly secured on blocks 30 adjustably mounted on a crossrod 31, the smoothers being controlled by springs 29<b> and situated so that the ends 29<a> are adjacent the top of the lower delivery roller 1. The contact 21 may be allowed an up-or-down movement so as to be lifted a short distance by the engagement therewith of the movable contact, and the electromagnet may be arranged to engage a clutch to move the table by mechanical means. The contacts may be replaced by a photoelectric or selenium cell and a light beam which is intercepted by the pile of work when it is of such a height as to require the lowering of the table.