Patent GB-1342654-A (GB)
Title: Mechanism for dispensing a metered mass of glass
Inventor: LEFEBVRE G
IPC: C03B7/14
Filed: 1971-04-19
Abstract: 1342654 Dispensing glass from metering moulds COMPAGNIE DES CRISTALLERIES DE BACCARAT 19 April 1971 [31 March 1970] 25805/71 Heading C1M Mechanism for dispensing a metered mass of glass from a metering mould comprises a circular, horizontal plate 2 rotatable intermittently about a vertical axis and having slots 7, 8, 9 ... at intervals each for receiving a metering mould 37, means at filling position 10 for providing a metered mass 31 of glass, as through a vertical tube 30, means such as rod 57 at positions 11, 12, 13, 14 for extracting the glass mass 31 from its mould 37, means such as a jack 87 and compressed air from pipe 90 at position 15 for cjecting any metered mass 31 of glass not previously extracted at any of positions 11 to 14 and means for cooling each empty mould at positions 16 to 21. Filling means (Fig. 2).-A vertical hydraulic jack 32 has its piston arm 33 connected to a member 34 sliding in guide sleeve 35 and pressing against a piston 36 in mould 37. Jack 32 is connected to outlet openings S1, S2 of a distributer 38, with sliding valve 39, the return openings R1, R2 of which are connected together and then to the inlet side of a rapid descent valve 41, with slide valve 42 and the inlet side of a slow descent valve 44 with slide valve 45. The outlets of valves 41, 44 are connected to a liquid reservoir 56, the line for valve 44 incorporating a flow regulating device 47. The reservoir 56 is connected to the central inlet E of distributer 38 via a pump 43. At each rotation of plate 2 distributer 38 is automatically activated so that valve 39 is in its upper position so that piston 33 operates to raise the mould 37 to its uppermost position. An operator then controls the descent of piston 33 by manual operation of flow regulating device 47 to maintain a constant distance between the nozzle 48 of the delivery tube 30 and the upper layer of the glass mass 31. A pointer 55 on member 34 against a graduated scale assists control. Extraction means (Fig. 3).-The glass maker extracts the glass mass 31 by inserting his rod 57 with enlarged tip 58 into the mass 31 and draws out the glass as the piston 36 ascends. At each position, 11 to 14, a pneumatic jack 59 is situated below plate 2 and is operated by a foot pedal 63 to raise its piston arm 60 and member 61 sliding in guide 62 to press against the piston 36. Controls for jack 59 comprise a pneumatic valve 64 connected to a compressed air source 51 and to an electrovalve 65, valve 64 having a slide member 64a operated by the pedal 63 and a return spring 69. Electrovalve 65 has slide valve 68 movable by a magnetic coil 67, activated by pedal 63, and return spring 70, and is connected to lower inlet C of a two-way distributer 66 having outlets S1, S2 connected to jack 59 and slide valve 66a pressed downwardly by a spring 71. The escape outlets E 1 , E 2  of distributer 66 are connected to flow regulators 72, 73 and the central inlet A to the compressed air source 51. Regulators 72 and 73 are manually operated to control the ascent and descent respectively of the piston arm 36. If operation is too protracted, or commenced too late, the electricity supply to coil 67 is cut, thus automatically starting descent of piston 60 whatever the position of the control pedal 63. Ejection means (Figs. 1 and 4).-The automatic ejection means includes pneumatic jack 81 below plate 2 with piston 80 and member 82, sliding in guide 83, which presses against the piston 36 in mould 37. Jack 81 is connected via flow regulators 81a and 81b to the outlets S1, S2 of distributer 79 having a slide valve 79a retracted by spring 79b. The central inlet A is connected to the compressed air source 51 and escape outlets E1, E2 are provided. For each mould 37 on plate 2, a cam 2a indicates its presence and acts on the slide valve member 75 of pneumatic valve 74 which is retracted by spring 76. Valve 74 is connected to air source 51 and to the inlet of a valve 93 which has a slide member 93a retracted by a spring 93b and operable by a manual control device 94. Outlet of valve 93 is connected in parallel to a retarding device with a flow limiter 92 in series with a capacity device 91 and to the inlet of a retarding cylinder 77 containing a cut off valve comprising a large diameter piston 77a and small diameter piston 77b, the other inlet of cylinder 77 being connected to the capacity device 91. The outlet 77c of cylinder 77 is connected to the inlet of a double action valve 78, the slide valve 78a of which is attracted by one of two magnetic coils 78b, 78c. Valve 78 is connected to valve 95 with slide member 95a controlled by manual device 95b and retracted by spring 95c, the valve 95 connecting with a control chamber 79c of the distributer 79. The piston 80 of jack 81 has a trigger 80a which at its uppermost position, when an unwanted glass mass 84 has been raised by piston 36, acts on the slide valve member 85a of a valve 85 normally retracted by spring 85b, the valve 85 being connected to air source 51 and to the control chamber 97c of a distributer 97 having a slide member 97a retracted by spring 97b and also to the control chamber 89c of valve 89 having a slide member 89a retracted by spring 89b. Distributer 97 has escape outlets E1 and E2, is connected to air source 51 and has outlets S1, S2 connected via flow regulators 87a, 87b to the horizontal scavenging jack 87 which is at the level of the mass 84 when pushed up from the mould and operation of piston 86 pushes the glass mass 84 and ejects it to a shoot 88. At the same time, valve 89 is operated to feed blast pipe 90 with compressed air which is directed into the interior of mould 37 to clean it. To eliminate the ejection mechanism, power supply may be cut off by manual control 94 and if the main circuit is faulty, the ejection can be operated by hand through valve 95. Rotation of , plate 2 after ejection, is initiated through a contact 96 operated by the piston 86 and if ejection is faulty, the coupling feed to rotate plate 2 is not operated, and the plate 2 must be turned back to restart. Mounting.-Plate 2 is mounted on a mobile frame 22 and driven to rotate by a motor 3 through a speed variation device 4, a coupling device 5 and a brake 6. The frame 22 is mounted by rollers 23, 24, 25 and 26 on guide rails 27, 28 and is moved by a jack 29 for positioning a mould 37 on plate 2 under the filling tube 30. The frame 22 is adjustably mounted and the forward travel of piston 102 of jack 29 is limited by an adjustable strip.