Push-out device for a glassware forming machine

Abstract: A push out device for a glass container making machine has a series of pusher fingers mounted on a pusher head arranged for the conventional extended and retracted movement and rotation about a vertical axis. The pusher fingers are mounted in a support plate of the pusher head so that the spacing between a base of the pusher head and the support plate may readily be adjusted.

Description: The present invention relates to a push out device for a glassware forming machine. Push out devices conventionally comprise container engaging fingers which are mounted on a pusher head. A piston and cylinder device operates to move the head between an operative, extended position and a retracted postion, and rotary means is provided for rotating the piston and cylinder device about a vertical axis. In the operation of the pusher device, the pusher head begins in a retracted position facing a dead plate of the glassware forming machine. The piston and cylinder then operates to extend the pusher head so that the container engaging fingers move between newly formed containers deposited on the dead plate, the rotary means then operates to rotate the piston and cylinder device through about 90° to carry the container off the dead plate onto a conveyor of the machine, the pusher head is then moved by the piston and cylinder device into its retracted position, disengaging from the containers and the piston and cylinder device is then rotated to bring the pusher head in its position facing the dead plate. It is desirable, on a change or size of container being manufactured by the forming machine, to be able to adjust the extended position of the pusher fingers on the pusher head appropriately to the container being deposited on the dead plate. This adjustment is desirably carried out rapidly, and on occasion without stopping operation of the machine. In US Patent No. 3559537 a push out device is shown in which the pusher fingers are each mounted on a slotted bracket and are secured in position by a bolt. Thus to adjust the extended position of the pusher fingers it is necessary to undo the bolt relating to each pusher finger, adjust its position and retighten the bolt - necessarily a time consuming and awkward operation. It is an object of the present invention to provide a push out device in which the extended position of the pusher fingers can readily be adjusted. The present invention provides a push out device adapted for use with a glassware forming machine to remove moulded containers from a dead plate of the machine to a conveyor, comprising one or more container engaging fingers mounted on a support plate of a pusher head, a piston and cylinder device for moving the pusher head between an operative, extended position and a retracted position and rotary means arranged to rotate the piston and cylinder device from an orientation in which the pusher head faces the dead plate to an orientation in which it faces the conveyor characterized in that the support plate is mounted on two supporting rods which extend through a base of the pusher head, the base being secured to a piston rod of the piston and cylinder device and the supporting rods extending parallel to the piston rod, and the base has mounted in it a securing device arranged to engage the supporting rods to secure them in position, whereby by disengagement of the securing device from the supporting rods, the spacing between the base and the support plate may be changed and by re-engagement of the securing device with the supporting rods the support plate can be locked in position relative to the base. There now follows a description, to be read with reference to the accompanying drawings, of a push out device which has been selected for description to illustrate the invention by way of example. In the accompanying drawings Figure 1 is a plan view of a push out device with a pusher head in its extended position Figure 2 is a plan view, partly in section, of the device shown in Figure 1, with the pusher head in a retracted position. Figures 1 and 2 show a push out device which is adapted for use with a glassware forming machine to remove moulded glass containers from a dead plate of the machine (not shown) onto which newly formed containers are deposited to a conveyor by which the containers are carried away for further treatment, for example inspection and packing. The push out device comprises three container engaging fingers 2, which is appropriate for use with a triple gob forming machine, but may of course comprise 1, 2 or 4 such fingers as appropriate. The fingers 2 are mounted on a support plate 4 of a pusher head 6. The pusher head 6 is mounted on a piston rod 8 of a piston and cylinder device 10 which operates to move the head 6 between an operative extended position (shown in Figure 1) and a retracted position (shown in Figure 2). The device also comprises rotary means (not shown) for rotating the piston and cylinder device about an axis A (Figure 1). In the operation of the pusher device, the pusher head begins in a retracted position facing the dead plate. The piston and cylinder then operates to extend the pusher head 6 so that the fingers 2 move between containers C on the dead plate, the rotary means operates to rotate the piston and cylinder device through about 90° into an orientation in which the pusher head 6 faces the conveyor, the pusher head is then moved by the piston and cylinder device into its retracted position to remove the fingers 2 from between the containers C and is then rotated back into a orientation facing the dead plate. The support plate 4 is mounted on two supporting rods 12, 14 which extend through a base 16 of the pusher head 6. The rods 12 and 14 each comprises a series of equally spaced circumferential recesses 18, which recesses 18 are spaced along the length of the rods between the support plate 4 and a head 20 of each rod (only one of which is shown). The rods 12,14 extend into cylindrical supporting sleeves 22, 24 which are secured by screws 26 to the base 16. The sleeves 22, 24 are mounted for axial sliding movement in bearings 28, 28 secured in bores 30,32 in a housing 34 of the piston and cylinder device 10. A spring 36 in the sleeve 22 urges the supporting rod 12 outwards - a similar spring (not shown) acts on the rod 14 in the sleeve 24. The base 16 is secured to the piston rod 8 by a screw 38. Secured to the base 16 is a cover plate 39, a slideway 40 being formed between the cover plate 39 and the base 16. Mounted in the slideway 40 is a securing device which is in the form of a plate 42. The plate is provided with three apertures, an aperture 44 surrounding the supporting rod 12, an aperture 46 surrounding the supporting rod 14 and an aperture 48 surrounding the head of the screw 38. In Figure 2 the plate 42 is shown in position in which it engages the supporting rods 12,14 to secure them in position with respect to the base 16, the edge of the aperture 44 being engaged in one of the recesses 18 on the rod 12, and that of the aperture 46 in one of the recesses 18 on the rod 14. It will be understood that the thickness of the plate 42 is chosen so that it can readily be firmly engaged in the recesses 18. Secured to the plate 42 is a small handle 50. When an operator wishes to adjust the distance between the support plate 4 and the base 16, he operates the handle 50 to slide the plate 42 in the slideway 40 to disengage the plate 42 from the recesses 18, moves the support plate 4 into the desired spacing from the base 6, and then re-engages the plate 42 in the recesses 18 to lock the support plate 4 in the desired position. If desired a latch may be fitted to prevent inadvertent movement of the plate 42. It will be realized than if it is desired to provide a different array of container engaging fingers 2, differing either in number or in spacing, the operator may, when he has disengaged the plate 42 from the recesses 18, remove the assembly of the fingers 2, the support plate 4, and the supporting rods 12 and 14 from the push out device and replace it with a similar assembly having the desired array of container engaging fingers.

Claims: A push out device adapted for use with a glassware forming machine to remove moulded containers from a dead plate of the machine to a conveyor, comprising one or more container engaging fingers (2) mounted on a support plate (4) of a pusher head (6), a piston and cylinder device (10) for moving the pusher head between an operative, extended position and a retracted position and rotary means arranged to rotate the piston and cylinder device from an orientation in which the pusher head faces the dead plate to an orientation in which it faces the conveyor characterized in that the support plate (4) is mounted on two supporting rods (12,14) which extend through a base (16) of the pusher head, the base being secured to a piston rod (8) of the piston and cylinder device and the supporting rods (12, 14) extending parallel to the piston rod (8), the base 16 has mounted in it a securing device (42) arranged to engage the supporting rods (12,14) to secure them in position, whereby by disengagement of the securing device (42) from the supporting rods (12,14) the spacing between the base (16) and the support plate (4) may be changed and by re-engagement of the securing device (42) with the supporting rods (12,14) the support plate (4) can be locked in position relative to the base (16). A device according to claim 1 characterized in that the supporting rods (12,14) are mounted for axial movement in cylindrical supporting sleeves (22,24) secured to the base (16). A device according to claim 2 characterized in that the supporting sleeves (22,24) are mounted for axial movement in cylindrical bores (30,32) of the piston and cylinder device, which bores (30,32) are parallel to the piston rod (8) of said device. A device according to any one of the preceding claims characterized in that the securing device is a plate (42) mounted for sliding movement relative to the base (16), the plate (42) having apertures (44,46) through which the supporting rods (12,14) pass and the supporting rods (12,14) having recesses (18), into which the plate can be engaged. A device according to claim 4 characterized in that the supporting rods (12,14) each comprise a series of equally spaced circumferential recesses (18).

Inventors: EGLOFF BEAT, EGLOFF, BEAT
Applicants: EMHART GLASS MACH INVEST, EMHART GLASS MACHINERY INVESTMENTS INC.
Application year: 1991
Main classification: C03B9
IPC codes: C03B35, C03B9