Patent GB-565062-A (GB)
Title: Improvements relating to glassware forming machine
IPC: C03B9/18
Filed: 1943-01-01
Abstract: 565,062. Glass manufacture. EVANS, W. E. (O'Neill Patents, Ltd.). Jan. 1, 1943, No. 53. [Class 56] Relates to a glassware forming machine of the kind in which two mould tables arranged side-by-side, are rotated step - by - step or intermittently in unison with one another and in opposite directions. The parisons are transferred from one table to the other and blown to shape on finishing moulds. According to the present invention, transfer of a parison takes place when the mould tables are moving at or near the lowest speed while moulds .are charged and the finished article removed at a complete stop in the intermittent motion. The mould tables 30, 199, Figs. 1 and 11, are geared together and rotated step-by-step by a mechanism, such as that described in Specification 557,064. At each table step a blank mould 35 arrives at the charging station as shown in Fig. 1a, in its inverted position and receives the charge of glass from a suitable feeder. The charge as it enters the mould is compacted into a ring mould 38 by suction and by compressed air. Suction is applied to the ring mould by a hollow arm 96 which is swung in a vertical plane about a hollow shaft 97, is connected by a suction valve 102 and the compressed air by a valve 100, both of which are operated by stationary cams, the times of operation being adjustable. These cams are so shaped that at appropriate times suction is applied to the mould to compact the glass about the mouth forming mandrel 88 and then compressed air is supplied to expand the glass in the mould 35 to form the parison. The compacting of the glass by suction is assisted by compressed air and a baffle plate 133 which is bought down on to the open end of the mould 35 to close the mould during the expansion of the charge to form the parison. The mould 35 consists of two parts hinged together and carried by a turnover drum 43 which is journalled in a bearing member 44 having its longitudinal axis arranged radially to the axis of the mould table. The flange 45 on the drum carries a series of rollers 46 which engage notches or recesses 47 formed on a stationary part 49 of the frame. The mould is opened and closed by stationary cams as the table rotates and the ring member 39 is opened against the action of a spring by a spreader head 76 which is rocked periodically by the stationary cams. After the mould is charged with glass, movement of the moulds past stationary cams causes the arm 96 and the baffle 133 to be moved away from the mould and the mould is then reverted and opened as it approaches the transfer position bearing the parison suspended by the ring mould 38, as shown in Fig. 1b. Just before the tables stop and while the movement is at a relatively low speed, the parison is transferred to the finishing mould 207, Fig. 11, the parison mould and the finishing mould move in closed paths which intersect at the transfer point and just before each pair of moulds reaches the point the parison mould is opened, leaving the parison suspended by the neck ring and the blow mould then closes around the suspended parison. The ring mould is then opened so that it releases the parison as the finishing mould closes. The transfers are all effected before the tables come to rest. During subsequent movement of the tables, the parison is blown to shape by air supplied through a blow head 246 which is swung downwards on to the mould and finally the mould opens and the finished article is removed by a take-out mechanism which may be of the kind described in U.S.A. Specification 1,537,963. The supply of compressed air for blowing the ware is controlled by a valve 257, one of which is provided for each mould. Each valve is opened at the appropriate times by a fixed cam, the contour of which is adjustable to enable the time of operation of the valve to be controlled. In addition, a manual control to each valve is provided to advance or delay the admission of air to blow the ware to finished form.