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US 4,230,010 AGranted
Device for cutting glass
AssigneeJenaer Glaswerk Schott & Gen.
InventorFranz Guenthner
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AssigneeJenaer Glaswerk Schott & Gen.
InventorFranz Guenthner
Estimating the term…
A device for cutting glass for example separating a drop or portion of a plastic glass skein emerging from a feeder characterized by having two shear arms mounted for rotation in a common frame, each of the shear arms being provided with a knife at its extreme end and a device for periodically moving the arms in a pincher-like closing movement toward one another and away from one another so that the knives can execute a cutting process. The device for periodically moving includes a device for forming a periodic working cycle preferably comprising at least one cam having one segment forming a working stage of a working cycle and a second segment forming an idle stage. By varying the speed of rotation of the cam while the follower is in the second stage, a time delay between the closing of the knives can be adjusted without changing the speed of movement during a cutting stage.
In a device for cutting glass, for example for separating a drop or portion of a plastic glass skein emerging from a feeder, said device having two shear arms mounted for rotation in a common frame, each of said shear arms being provided with a knife at its extreme end, and means for periodically rotating the arms to move in a pincher-like closing movement toward one another and awat from one another so that the knives execute a cutting process, the improvements comprising the means for periodically rotating including means for forming a periodic working cycle, said working cycle having two different stages with one stage being a working stage in which the knives execute the cutting process with a temporal sequence of movement which is essentially unalterable in its operating time from a given drive setting and the other stage being an idle time stage in which the glass shears are in an open position and the temporal sequence of movement can be changed within broad limits.
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob , e.g. controlling the gob shape, weight or…:…
With simple oscillating motion only: and means to move cooperating cutter member
Tool driver movable relative to tool support: cam or eccentric revolving about fixed axis
Manufacture, shaping, or supplementary processes
Term ended 4 Apr 1999 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention is directed to a device for cutting glass, for example for separating a drop or a portion from a plastic glass skein which is emerging from a feeder. The device includes two shear arms mounted for rotation in a common frame with each of the shear arms being provided with a knife at its extreme end and means for periodically rotating the arms to move in a pincher-like closing movement toward one another and away from one another so that the knives execute a cutting process. In particular, the invention is directed to the improvement in the means for periodically rotating the arms.
2. Prior Art
FIG. 1 is a bottom view of the first embodiment of the device in accordance with the present invention;
FIG. 2 is a partial cross section with portions in elevation for purposes of illustration taken along lines II--II of FIG. 1;
FIG. 3 is a top view of the device of FIG. 1 with the arms being provided with means for storing energy;
The principles of the present invention are particularly useful in a device generally indicated at 40 in FIGS. 1, 2 and 3 for cutting a drop or portion from a skein 21 of glass which is being extruded or is emerging from a mouth 22 of a feeder (FIG. 2).
The device 40 includes a frame 41, which supports a pair of shear arms 5 and 8 for rotation. In addition, the frame supports a motor 1 (FIG. 2) which may be put into operation by a signal relayed from a control of the production system or device. A cam plate 2 is connected by a drive train 42 to the motor 1 to be rotated thereby. As illustrated, the cam plate 2 is a rabbet cam plate having a groove 13 which forms double cam surfaces for receiving a follower 3. The follower 3 is illustrated as a roller which is mounted for rotation on the end of a lever 4 by means 45 for mounting (see FIG. 4). The lever 4 is connected on a shaft 43 which rotatably supports one of the shear arms 5. The shaft 43 also supports a gear segment or gear 6, which meshes with the gear 7 contained on a shaft that rotatably supports the other shear arm 8 so that rotation of the shaft 43 and its arm 5 in a clockwise direction causes rotation of the arm 8 in a counterclockwise direction to form a pincher-like movement. Each of the arms 5 and 8 support knives at one end with the arm 5 having a knife 9 and the arm 8 having a knife 10 which knives coact to cut the drop or portion from the glass skein 21.
The cam plate 2, as best illustrated, has the cam surface formed by the groove 13 with an idle sector of an angle .alpha., which has a constant radius, and the remainder working sector has an angle of 360.degree.-.alpha.. In addition, the cam has a projection or lobe 11, which is positioned so that as the follower moves from the working segment into the idle sector the lobe 11 coacts with a switch 12 which indicates the occurrence of the transition between the working segment and the idle segment.