Patent GB-166681-A (GB)
Title: Improvements in or relating to apparatus for manufacturing hollow cases
IPC: B31B3/44
Filed: 1920-04-17
Abstract: 166,681. Paper Tube & Box Co., Ltd., and Genzel, R. F. April 17, 1920. Embossing; cupping. - Relates to multiple presses for the manufacture of hollow cardboard &c. cases, of the kind comprising a number of plunger-and-die presses mounted on a rotatable carrier, and means, such as a stationary camtrack disposed in the path of the press plungers, acting automatically to bring each plunger into and out of engagement with its respective die during each revolution of the carrier. In a multiple press of this type, and wherein the die of each press is constructed in separable parts as described in Specification 137,068 to facilitate the ejection of finished cardboard cases formed with peripheral flanges, means are provided operating automatically during each revolution of the carrier to feed a blank to each press, to close the separable parts of the die prior to the descent of the plunger, and to open the die parts. In the form illustrated, which comprises a series of five presses, three circular plates 5, 6, 7 are carried by, and rotate with, the driving-shaft 4, the plates 5, 6 constituting guides for the plungerrods 9, and the plate 7 carrying the lower dies. The plunger-rods are raised and lowered during each revolution of the shaft 4 by means of a stationary cam track 13 engaging rollers 11, 12 on the rods. The dies are mounted above openings 14 in the carrier plate 7, each die being formed in halves 17, Fig. 4, pivoted together at 18 and provided at the ends remote from the pivot with pins 20 engaging oblique slots 21 in actuating plates 22, Fig. 6, which are reciprocated longitudinally of the machine at the proper times to open and close the dies by means of the fixed .cam track 26, Fig. 5, actuating bars 24 connected to rods 23 to which the plates 22 are secured. Associated with each die and below it is a radially slidable base-plate 16, which is in position to provide a base for the die while the cardboard case is being formed, and is moved outwardly when the case is finished to allow the completed case to fall through the opening 14. Above each die is a fixed guide-plate 29 with a curved slot 28 for a pusher feed-plate 27 which is actuated at the right time to move a cardboard blank fed to the guide-plate 29 automatically or by hand into position over the die as the plunger descends. The base-plates 16 and feed-plates 27 are actuated from a single fixed face-cam 30, Fig. 4, as follows. The feed-plates 27 are connected to levers 32, which are pivoted at 33 to brackets revolving with the carrier plate 7 and carry rollers 34 projecting into the cam-groove 30. Pivoted also to the brackets are links 36 connected to other levers 37, which are connected to the base-plates 16 and carry rollers 39 projecting into the cam-groove 30. In operation, the feed-plate of each press moves inwardly to position the cardboard blank over the die, the halves of the latter being closed simultaneously. The base-plate then moves inwards during the gradual descent of the plunger. The latter may be formed, as in the manner described in Specification 124,713, with resilient means for shaping peripheral flanges on the cardboard cases. Fig. 3 shows a construction of adjustable plunger rods, comprising two cylindrical members 44, 48, the latter threaded to receive a screwed sleeve 50, which is threaded internally to accommodate a threaded rod 51 carrying the earn-engaging rollers 11, 12. The effective length of the rod may be adjusted by a nut 52 mounted on the inner end of the rod 51 and abutting the end of the sleeve 50, the parts being secured by the locknut 53. The inner member 48 carries a pivoted lever 54, normally held by a spring-pin 55 in the position shown to hold the members 48, 47 spaced apart, but adapted to be swung outwardly to allow these members to be telescoped for the purpose of rendering a particular press unit inoperative. The dies are heated by burners 46 positioned on the underside of the rotating carrier plate 7 and fed by gas pipes 43, 44, from a supply pipe in a central bore in the lower part of the driving shaft 4.