Glass manufacturing – Plunger
Patent
1996-02-21
1998-04-07
Czaja, Donald E.
Glass manufacturing
Plunger
65328, 65330, 65126, C03B 1106, C03B 526, C03B 700, C03B 528
Patent
active
057359261
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
1. Field of the Invention
The invention relates to glass forming machines, and more particularly to an apparatus for driving a plunger of a glass forming machine into and out of a feeder head for effecting the outflow of molten glass.
2. Description of Related Art
In one known apparatus of this type (DE 42 31 455 A1) the take-off shaft is connected by means of a coupling to a coaxial threaded spindle which is in threaded engagement with the rotationally fixed link member which is longitudinally displaceable on the tilt lever. The servodrive is mounted on a horizontal shaft which is fixed in relation to the apparatus so as to be movable upwards and downwards as a whole. In each operating cycle the servodrive drives the threaded spindle back and forth reversibly. The result of this is extra expenditure on control and increased wear in the drive system.
From DE 42 39 725 A1 it is known, in an apparatus according to the aforesaid DE 42 31 455 A1, to form the link member as a clamping member with a setting drive which can be tightened to the tilt lever (rocker arm). Moreover, here the longitudinal displacement of the clamping member along the tilt lever is no longer effected by a hand crank but is motorized and effected by an adjusting device having a setting drive.
From German patent specification DE 514 112, U.S. Pat. No. 1,596,438 A and JP 1-234 335 A (Patent Abstracts of Japan, C-665, Dec. 13, 1989, Volume 13/No. 562) an apparatus is known which is essentially the same as that described as part of the state of the art in the aforesaid DE 42 31 455 A1 at column 1, lines 12 to 36.
SUMMARY OF THE INVENTION
It is the object of the invention to improve the drive system for the plunger.
This object is achieved by the features of the invention which provides a new and novel apparatus for the motorized lifting of a plunger which is movable into and out of a feeder head of a feeder for a glass forming machine. The apparatus includes a tilt lever mounted for a rising and falling movement on a horizontal bearing shaft which is fixed relative to the apparatus. The tilt lever has one arm coupled to a plunger holder which can be raised and lowered, and has another arm.
A link member is provided with which the other arm of the tilt lever cooperates. The link member is adjustable along the other arm to change the stroke of the plunger. A drive system has an electric servodrive which has a take-off shaft. The servodrive is connected to the link member and controllable by electronic control means. The servo drive is fixed relative to the apparatus. Fixed to the take-off shaft of the servodrive is a crank. The link member is arranged on a tie rod which is coupled at a coupling point to a free end of a pivot lever. The pivot lever is mounted at a bearing point fixed in relation to the apparatus. Coupled to the pivot lever between the bearing point and the coupling point of the pivot lever is a push rod having a first end. The push rod has a second end coupled to the crank.
The electric servodrive can comprise an electric servomotor or an electric servomotor and a subsequent gear transmission. The drive system is designed to be comparatively simple and functionally reliable. Existing gob feeders for glass forming machines can be equipped with the drive system of the present invention at minimal cost.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features and advantages of the invention will now be described in more detail with reference to the embodiments which are described hereinafter by way of example and which are shown in the drawings. In the drawings:
FIG. 1 is a side view of a plunger mechanism;
FIG. 2 is a side view, on an enlarged scale and partly in longitudinal section, of a part of the drive system shown in FIG. 1; and
FIG. 3 is essentially the sectional view taken along the line III--III in FIG. 2, on a further enlarged scale.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a plunger mechanism 1 in which at least one plunger 2 is suspended from a plunger holder 3 and is movable in the ve
REFERENCES:
patent: 1596438 (1926-08-01), Lorenz
patent: 1645221 (1927-10-01), Barker, Jr.
patent: 1657640 (1928-01-01), Peiler
patent: 2725681 (1955-12-01), Wythe
patent: 2749665 (1956-06-01), Peiler
patent: 3201218 (1965-08-01), Wythe
patent: 4551163 (1985-11-01), Duga et al.
Patents Abstracts of Japan, C-665 Dec. 13, 1989 vol. 13/No. 562, Method for supplying Glass Gob, 1-234335(A).
Bogert Hermann
Geisel Gerhard
Hermening Heinz
Czaja Donald E.
Ruller Jacqueline A.
The Firm Hermann Heye
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