JP2506250B2 - Shearing device for shearing glass gobs from glass fluid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows each glass gob to be separated by a pair of shears, each pair of shearing blades being disposed on an associated pivotally mounted shearing arm to pivot the two shearing arms. A shearing device for shearing a glass gob from one or more glass fluids of a glass melt, the motion of which is synchronized with a pivoting motion generated by driving one of the shearing arms with a drive mechanism by means of a gear mechanism.

[0002]

2. Description of the Prior Art Known devices of this type (German Patent No. 2)
818234 B1), an electric drive rotationally drives a cam plate having arcuate grooves. A roller of a lever, which is fixed to the pivot of one of the shear arms, runs in the arcuate groove. The arcuate groove is formed so that the shear arm maintains the most advantageous speed for the individual portions of the working cycle corresponding to the working sector and is fixed as it traverses the dead center sector. The cam plate is either stopped in the dead center sector or slowly rotated for temporary positioning. Restraining the arcuate groove track in the working sector has the disadvantage of being inflexible and expensive. Blocking or decelerating the rotational speed of the drive in the dead center sector causes additional costs.

From US Pat. No. 3,736,826,
It is known to drive a crank arm with a hydraulic rotary drive and to drive another crank arm in the opposite direction with a pair of gears. Each eccentric pin on the crank arm drives a respective connecting rod which is connected to one of the two shear arms. This device has the drawback of being expensive to construct and difficult to control from a technical point of view.

It is known from German Patent No. 1922247B to provide a mounting bracket which can be adjusted in the outer peripheral direction of the supply outlet 12.

Another known device (US Pat. No. 247256)
No. 0), an air-mechanical drive for the shear arm is used. One shear arm is connected by a connecting rod to a pivot lever with a cam roller.
The cam roller runs on a rotary cam track, and another rotary cam track is coaxially arranged on the rotary cam track for the operation of the pneumatic control valve. The control valve supplies compressed air to the cylinder chamber of the piston-cylinder arrangement by means of a conduit, the piston rod of the piston-cylinder arrangement being connected to the other shear arm. Thus, the closing force of the shear blade is generated by the piston-cylinder arrangement, and the course of the closing movement is mechanically controlled by the cam track. In addition to this, the piston-cylinder device always holds the cam roller in contact with the cam track. However, this known device has the drawback of being very expensive and of being completely inflexible. Although having a relatively high cutting rate, for example up to about 200 cuttings per minute, the known drive is overloaded. Moreover, the working stroke of the shear arm is the same as its repair stroke for replacing the drip ring, which is therefore large and undesirable.

From US Pat. No. 2,977,718 a device using an air-hydraulic drive is known. This device requires expensive circuits and likewise has a high cutting speed, which is not suitable.

Another known device (US Pat. No. 2,678,851)
No. 9), each of the two shear arms is driven separately in the same way and is actually movable by a piston of a pneumatic cylinder, a connecting rod and a crank,
It is driven by a crank pin having a crank shaft, a pinion, and a gear rack. Control of the pneumatic cylinder is provided by multiple valves in the cam and pneumatic circuit. This device also has the disadvantage of being expensive and inflexible.

From GB 688 803 is known a device in which both shear arms can each be driven by a toggle link via a piston rod of a common double-acting pneumatic cylinder. With this arrangement the contour of the movement of the shearing arm cannot be reproduced. The length of the shear arm must match the stroke of the cylinder. Shear arms 1 and 2 with respect to the axis of the drop ring
There are drawbacks such as not being able to center.

It is an object of the present invention to provide a shearing device for shearing a glass gob of glass fluid which overcomes the above mentioned drawbacks of the prior art.

[0010]

According to the invention, a crank having an eccentric crankpin is drivable by means of a drive, the connecting rod being connected to the crankpin on the one hand and to the shear arm on the other hand. It is an object of the present invention to achieve the above-mentioned object by disposing the driving device on the carriage and making the carriage movable in the direction perpendicular to the longitudinal direction of one of the shear arms.

In this way, two glass gobs of molten glass in the case of a double mold operation and three glass gobs in the case of a triple mold operation can be sheared substantially simultaneously from the glass fluid concerned. Similarly, a number of pairs of shear blades are located on each shear arm at a spacing equal to the spacing of the glass fluid. Preferably,
The crank makes a full rotation over 360 ° in each operating run. The cutting stroke can be changed in a simple manner by adjusting the effective crank radius. The crank is stopped after each working run so that the runs are not asynchronous and remains in this standstill for a minimum waiting period of, for example, 20 milliseconds. For example 25
For a period of constant movement of the shear arm during one actuation cycle of 0 ms, the length of the waiting period is the cutting rate, ie
Depends on the number of cuts / minute. The crank drive is designed as a non-linear transmission gearing, which allows the drive to be started in a relatively light load regime. Thus, it is easier for the drive to accelerate itself when starting, reducing the energy requirements. The use of a carriage offers the special advantage of keeping the working stroke of the shearing arm to a minimum, whereby the working energy can be reduced on the one hand and increased to the maximum possible working speed on the other hand. The carriage also makes it possible to open the shearing arm very easily and quickly beyond the open position with respect to the working stroke. This further opening is desired, for example, when the drop ring of the supply bowl has to be repaired or replaced. This allows access to the drop ring and its surroundings for repair in a very quick and simple manner. Further opening of the shear arm to its repair position can be done automatically when the drive is shut down. For this reason, the control of the drive unit generates a start pulse for further control for returning the carriage. In that case, the shear arm remains in a further open state set safely until the drive defect is overcome. In this way the shear blades are not allowed to collide with the glass fluid.

In the preferred embodiment of the invention, the carriage is guided on a guide rod of a bracket, which bracket is circumferentially adjustable of a supply bowl which supplies one or more glass fluids. According to this embodiment, the drive for the bracket or carriage and the shearing arm is simple with respect to the shearing arm, in fact to an optimum angular position depending on the circumferential space required on one or the other side of the shearing arm. And it can be adjusted quickly. Also, in the case of multiple shears configured to shear a glass gob from at least one or more glass fluids, the shear arm itself can be adjusted circumferentially with respect to the feed bowl in a manner known per se. The circumferential setting of the bracket with the shearing arm and the drive is preferably done by fastening these elements with hammer bolts in the T-groove of the supply bowl in the circumferential direction. Preferably, two such T-shaped grooves are axially arranged on the supply bowl at a distance from each other, so that the shear arm and the drive device can be fixed to the supply bowl sufficiently firmly.

The carriage has at least one piston
It is displaceable by means of a cylinder device, which is rigidly supported on the one hand on the carriage and on the other hand in relation to the bracket of the device. Piston-
The cylinder device is preferably a double-acting unit so that the carriage can be moved in both directions by the driving force.

According to a preferred embodiment, the movement of the carriage moving in the direction of the shear arm for adjusting the overlap of the shear blades is adjustable and at least one stop member rigidly mounted on the bracket of the device. Limited by Therefore, the overlapping of the shearing blades can be adjusted in a particularly simple manner and very accurately. The overlap of the shear blades in each pair of shear blades, ie the mutual overlap, should be kept as small as possible. The glass gob must be cleanly separated from the glass fluid. As soon as shearing has taken place, the shearing blades should no longer make unnecessary overlaps with each other, yet their return movement to the open position should be immediate.

The connecting rods are connected at their two ends by universal joints. This facilitates height adjustment of the shear arm relative to the outlet of the aperture ring which allows the molten glass fluid to drain from the supply bowl.

Preferably, the drive device comprises an electric servomotor. This provides a particularly convenient drive mechanism. In particular, it is possible to use a three-phase servomotor with feedback as the servomotor, the control of which is freely programmable in terms of speed-angle of rotation-path. Therefore, by pre-programming, the shear arm can have an optimal velocity value at any angular position, and if practically necessary,
Different velocity values can be provided for the opening and closing movements of the shear arm. With the use of an electric servomotor, as mentioned above, the total cycle duration, which can be 250 ms, can in fact be reproduced with an accuracy of, for example, about 1 ms.

The drive preferably has a gear mechanism connected between the servomotor and the crank. In this way the speed of the servomotor can be freely chosen.

Preferably, the pneumatic piston-cylinder device is connected on the one hand to the other of the shear arms and on the other hand to the bearings provided in the device. Such a piston-cylinder device effectively operates as an air spring. The gear mechanism for synchronizing the shear arms preferably consists of toothed segments that mesh with each other and are provided coaxially with respect to the spaced pivots of the shear arms. The air spring permanently holds the teeth of the toothed segment in contact with each other as much as possible. In this way,
The toothed segment allows its actuation to be precise, freeing the drive means from avoidable loads and improving the positioning of the shear blade.

Preferred embodiments of the shearing device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a shearing device 1 for shearing a gob from two glass melts (not shown). This glass fluid is generated at the lower end of the supply bowl 3 from the opening ring 2 perpendicular to the plane of the drawing. Supply bowl 3
Is intended to mean the end piece of the feeding mechanism which is known per se for fused glass. Two
The longitudinal axes of the two molten glass fluids are designated by the numerals 4 and 5 in FIG.

A pair of shear blades 6 having shear blades 7 and 8.
Periodically separates a gob of molten glass from a glass fluid having a longitudinal axis 4. These gobs are fed in a manner known per se to a glass forming machine for the production of hollow glass bodies. In a similar manner, a pair of shear blades 9 having shear blades 10 and 11 periodically separate the glass gob from the glass fluid having the longitudinal axis 5. Each shear blade 7, 8 and 10, 11 is provided with a V-shaped cutting edge at its free end.

The shearing blades 7, 10 are fixed to the first shearing arm 12 at intervals equal to the spacing of the longitudinal axes 4, 5, and likewise the shearing blades 8, 11 are at the same spacing as each other for the second shearing arm 13. It is fixed to. Shearing arms 12, 13
Are rotatably mounted on pins 14 and 15, the pivoting movements of the shear arms 12, 13 being synchronized with each other by a gear mechanism 16. The gear mechanism 16 is in this case a toothed segment 17 on the shearing arms 12, 13 which mesh with each other.
And 18. The pins 14 and 15 are fixed to the holder 19 so as to be laterally spaced from each other.
The holder 19 has two setting rails 22 and 23 axially spaced from each other by four hammer bolts 20.
Since it is fixed to (FIG. 2), the holder 19 can be adjusted along the outer peripheral direction 21. The head (not shown) of the hammer bolt 20 engages with the T-shaped grooves 24 and 25 of the setting rails 22 and 23.

An extension 26 extends from the holder 19 and has a bearing 27 at its outer end. One end of a pneumatic piston-cylinder device 28 is connected to the bearing 27, and the pneumatic piston-cylinder is connected. The device 28 is designed as an air spring. The piston-cylinder device 28 is attached at its other end to a bearing 29 of a lateral lever 30 of the second shear arm 13.

In FIG. 1 the shear arms 12, 13 are shown in solid line in their closed position with an optimum overlap of the shear blades 7, 8 and 10, 11. An open operating position 31 with an operating stroke 32 of the shear arm 12 on the one hand in the chain line and an open operating position 33 with a relatively large repair stroke 34 for the shear arm 12 on the other hand.
Is shown. Generally, the shearing device 1 is capable of holding to a minimum the working stroke 32 for the shearing arms 12,13.
Drive at. In this way operating energy and wear are reduced to a minimum. If a repair operation has to be performed on the aperture ring 2, the shear arms 12, 13 are moved to the open repair position 33 in the manner described below. This gives the repairer sufficient arc of free space to approach the aperture ring, facilitating repair or replacement of the aperture ring.

A bracket 35 is mounted on the setting rails 22 and 23 of the supply bowl 3 at a constant interval from the holder 19 and fixed by a hammer bolt 20. The bracket 35 is circumferentially attached by the hammer bolt 20. It is adjustable in the direction. The circumferential adjustment is chosen so that an optimum angular position of the drive 36 with respect to the shear arms 12, 13 is produced. The bracket 35 can be located on one side or the other side of the holder 19 depending on the available spacing.

Guide rods 37 and 38 are fixed on the bracket 35, and the guide rods 37 and 38 are laterally arranged at regular intervals to each other.
A carriage 39 is movable on the disks 7, 38 in a direction perpendicular to the longitudinal direction of the shear arm 12. Carriage 3
9 supports the drive unit 36. The drive device 36 comprises an electric servomotor 40 having a gear device 41 on its output side. The gear device 41 can be omitted by an appropriate configuration of the servomotor 40. In any case, the servo motor 40 causes the clamp pin 43
Drive the crank 42 having The adjustable length connecting rod 44 is connected by one universal joint 45 and 46 to the crank pin 43 on the one hand and to the pin 47 of the shear arm 12 on the other hand.

As shown in FIG. 1, the crank pin has 18
Shear arm 1 when advanced to the dashed line position through 0 °
2 and 13 move to the open operating position 31. Shearing arm 1
2, 13 are held in their open operating position for a somewhat longer waiting period until drive 36 receives a start pulse for a new operating cycle from its program controller (not shown) as described above.

On the other hand, when the shear arms 12, 13 have to be moved to their open repair position 33, the double-acting pneumatic piston-cylinder arrangements 48 and 49 are activated. The piston-cylinder devices 48, 49 are supported on the one hand by the extensions 50 and 51 of the carriage 39 and on the other hand by the bracket 35. The operation of the piston-cylinder devices 48 and 49 is transmitted to the carriage 39, and the carriage 39 moves to the left side together with the drive device 36 toward the end position shown by the dashed line in FIG.

If the drive 36 or its program control fails, or if there is a noticeable loss of power, the program control stops the drive 36,
A start signal can be sent to the other control devices for the piston-cylinder devices 48, 49 so that the shear arms 12, 1
The carriage 39 is automatically moved to open the carriage 3.
Thus, in all cases the shear arms 12, 13
The collision between the glass fluid and the glass fluid is prevented.

By actuating the piston side of the piston-cylinder devices 48 and 49, the carriage 39 is returned to its actuated position as shown in solid lines in FIG. In this operating position, the carriage 39 is in contact with two stop members 52 and 53, which are embodied as set screws. The stopper members 52 and 53 are each a bracket 3
5 are threaded into extensions 54 and 55, respectively, to form an overlap of a pair of shear blades 6 and 9.

FIG. 2 shows further details of the shearing device 1. In particular, the dash-dotted line indicates that the shearing arm 12 and the corresponding shearing arm 13 can also be adjusted in a manner not shown in relation to the opening ring 2 in a direction perpendicular thereto. The limit position of the shear arm 12 is as indicated by the dashed line. Similarly, the adjustable length connecting rod 44 can be moved angularly with respect to the horizontal. The length adjustment for such angular adjustment can be performed by adjusting the length of the connecting rod 44. Universal joints 45 and 46 facilitate this height adjustment of shear arm 12.

Therefore, the shear arms 12, 13 are driven directly during the entire working cycle according to the invention. A pair of shear blades 6, 9 is controlled by the program control of the electric servomotor 40.
Can be driven at any desired speed. Further, the number of cuts per minute can be increased or decreased by changing the program of the control device in a simple manner even during the shearing operation. Preferably, the crank pin 43 always moves in the same rotation direction. This shear drive makes it possible to achieve the highest cutting speeds per minute required by current glass forming machines which are problem-free and can be regenerated within the narrowest range.

Due to the above-mentioned constitution of the present invention, a plurality of glass gobs can be sheared from the glass fluids concerned at substantially the same time depending on the operating conditions, and a large number of pairs of shear blades are equal to the spacing of the glass fluids. Placed on each shear arm at intervals, the cutting stroke can be changed in a particularly simple manner by adjusting the effective crank radius. Further, since the shearing arm can be moved to a repair stroke having a wider opening interval than the operation stroke, repair and replacement of the constituent members can be performed quickly and easily.

[Brief description of drawings]

FIG. 1 is a bottom view showing a part of a shearing device as seen from below in a cross section.

2 is a side view in section showing a portion of the device taken along the line II-II in FIG. 1. FIG.

[Explanation of symbols]

 1 Shearing Device 3 Supply Bowl 6 Pair of Shearing Blades 7 Shearing Blade 8 Shearing Blade 9 Pair of Shearing Blades 10 Shearing Blade 11 Shearing Blade 12 Shearing Blade Arm 13 Shearing Blade Arm 16 Gear Mechanism 28 Piston-Cylinder Device 35 Bracket 36 Drive Device 37 Guide rod 38 Guide rod 39 Carriage 42 Crank 43 Crank pin 44 Coupling rod 45 Universal joint 46 Universal joint 52 Stopper member 53 Stopper member

Claims (8)

(57) [Claims] 1. A pair of shearing blades allow each glass gob to be separated, and each pair of shearing blades is disposed on a respective associated shearing arm that is pivotally mounted so that the pivoting movement of the two shearing arms is geared. The mechanism synchronizes with the pivoting motion generated by driving one of the shear arms by the driving device, enables the driving device to drive the crank having the eccentric crank pin, and connects the coupling rod connected to the eccentric crank pin to one of the two. One or more glass melts characterized in that they are connected to a shearing arm and a drive is arranged on the carriage, which carriage is movable in a direction substantially perpendicular to the longitudinal direction of one of the shearing arms. A shearing device that shears a glass gob from a glass fluid. 2. The carriage can be guided on a guide rod of the bracket, and the bracket can be adjusted in the outer peripheral direction of a supply bowl arranged to supply one or more glass fluids. Item 2. The shearing device according to Item 1. 3. The carriage according to claim 1, wherein the carriage is movable by at least one piston-cylinder device, the piston-cylinder device being supported on the carriage on the one hand and on the bracket on the other hand. The shearing device according to. 4. The movement of the carriage with respect to the direction of the shearing arm can be restricted by at least one stopper member for adjusting the overlap of the shearing blades, and the stopper member is adjustable and mounted on a bracket. The shearing device according to any one of claims 1 to 3. 5. The shearing device according to claim 1, wherein the two ends of the connecting rod are connected to each other by universal joints. 6. The shearing device according to claim 1, wherein the drive unit is an electric servomotor. 7. A shearing device, characterized in that the driving device comprises a gear device connected between a servo motor and a crank. 8. The shearing device according to claim 1, wherein a pneumatic piston-cylinder unit connected to the other one of the shearing arms is supported by a bearing.