JPH0920522A - Apparatus for press forming of glass - Google Patents

Abstract

PURPOSE: To provide an apparatus for press forming of a glass capable of readily accurately setting an operation timing of a turntable or a pressing machine, shortening the time required for forming and reducing the defectives of the formed product. CONSTITUTION: This apparatus for press forming of a glass is obtained by connecting a turntable 10 having forming metallic molds 12 arranged at a prescribed interval on the same circumference to an output shaft of an indexing unit 19 in a driving part 11, intermittently rotating the turntable while keeping the turntable so as to repeat the stop and rotation, pressing the forming metallic molds 12 fed with a gob 24 with a pressing machine 2 and carrying out the forming and working. Since the operation start of the pressing machine 2 is controlled based on a signal from the first encoder 20 for outputting a rotational angle signal of the output shaft at this time, the stop of the turntable 10 at a prescribed position and angle can accurately be known from the output of the first encoder 20. The timing of operation start of the pressing machine 2 can simply and accurately be set based thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass press-molding apparatus for intermittently feeding a plurality of molding dies so as to circulate them, and molding them.

[0002]

2. Description of the Related Art Conventionally, a glass molding product, such as a halogen mirror cover glass, is molded by a press machine, a molding die for molding a gob (glass melted mass) supplied from a spout by the press machine, and a plurality of molds. The press molding apparatus has a turntable in which the molding dies are provided on the same circumference at predetermined intervals, and a drive unit for intermittently rotating the turntable. The drive unit includes a drive motor, a clutch brake mechanism that turns ON / OFF the rotation of the drive motor to output, and an index unit that is connected to the output side of the clutch brake mechanism and that rotates the turntable with a cam output of 90 °. Is equipped with.

In the forming process, the turntable is intermittently rotated while the clutch / brake mechanism is turned on / off to intermittently feed the die in the circumferential direction, and the die is first stopped at the gob feeding position. Supply the gob to.
After that, the turntable is rotated to move the molding die to which the gob is supplied to the press molding position and stop it, and the press machine is operated to perform molding. Then, the formed molding die is sent to the take-out position several positions ahead, and the glass molded product is taken out.

By performing such a molding process in parallel and sequentially in each of a plurality of molding dies provided on the turntable and moving intermittently, a glass molded product is continuously molded. It was

The time chart of the above-mentioned molding process is as shown in FIG. 3, for example. That is, when viewed in the middle of a continuous molding process, the shear cut gob is supplied from the spout to the molding die through the chute. Assuming that the molding process this time has started with reference to the time point when the feed of the gob is detected and the feeder signal is turned ON, the gob-in for the next molding process is started 0.2 seconds later, followed by 0.3 second. After that, the operation of the pressing machine in the former molding process is turned off. Then, the glass molded product molded by the previous molding process is taken out.

Then, 0.4 seconds after the reference time, the clutch brake mechanism operates as the operation in the present molding process.
The N state is entered, and after 1.1 seconds, the cam shaft of the index unit is turned on for 4.0 seconds up to 1.5 seconds later. While the camshaft is in the ON state, the turntable rotates by a predetermined angle, and the gob-supplied molding die moves to the press molding position and stops.

Further, when the molding die stops at the press molding position, that is, when the cam shaft is turned off, the operation of the press machine is started, the pressurizing mechanism of the press machine is lowered, and the molding work by the molding die is carried out. After 2.1 seconds from the reference time point, the pressurizing mechanism rises and the operation of the press machine is turned off. Meanwhile, the molded glass molded product is taken out from the molding die stopped at the take-out position.

On the other hand, 1.2 seconds after the reference time, the gob for the next molding process is shear cut, and 1.8 seconds after the gob is supplied to the molding die through the chute, the next molding process is performed. The feeder signal, which is the starting reference, is turned on. In this way, one forming process requires one camshaft
It is performed in a cycle of 1.8 seconds while intermittently rotating and moving the molding die while rotating.

However, in the above-mentioned prior art,
A proximity sensor is used as a sensor that outputs a feeder signal based on the detection that the shear cut gob is supplied to the molding die through the chute, and the molding die to which the gob is supplied is detected. A proximity sensor has been used as a sensor for detecting a stop position of a turntable that has stopped by rotating a turntable by a predetermined angle in order to detect that the turntable has moved to a press position and stopped.

For this reason, it is very difficult to adjust and set the timing at which the turntable starts rotating after the start of the gob-in, and the detection operation time of the proximity sensor varies widely, resulting in a detection signal output timing. It will vary, and it is necessary to add a waiting time to the rotation start timing of the turntable and a waiting time to the operation start timing of the press machine, and the ON time of the clutch brake mechanism is 1.4 times. It could not be shorter than the second, and the time of one cycle of the molding process was long.

Further, since the cam output of the index unit is 90 °, if the rotation speed of the drive motor is increased so as to shorten the time of one cycle of the molding process,
The peripheral speed of the turntable becomes faster, and the gob housed in the molding die fluctuates in the molding die. Then, when the molding process is carried out by the press machine as it is, the molded glass molded product becomes a defective product.

[0012]

As described above, since the proximity sensor conventionally outputs the feeder signal and detects the stop position of the turntable, it is difficult to adjust / set the rotation start timing of the turntable. There is variation in the detection operation time by the proximity sensor and the detection signal output timing, and it is necessary to provide a waiting time for the rotation start timing of the turntable and the operation start timing of the press machine. If the speed of the drive motor is made faster and the time for one cycle is shortened, the peripheral speed of the turntable becomes faster and the gob in the molding die fluctuates and the glass is formed. The product was defective. The present invention has been made in view of such circumstances, and an object thereof is to adjust the rotation start timing of the turntable, the operation start timing of the press machine, and the like.
It is an object of the present invention to provide a glass press-molding apparatus that can be easily and accurately set, shortens the time of one cycle of the molding process, and further reduces defects in glass-molded products.

[0013]

DISCLOSURE OF THE INVENTION A glass press molding apparatus according to the present invention comprises a plurality of molding dies, a turntable in which these molding dies are arranged at a predetermined interval on the same circumference, and this turntable is output. A drive unit that is connected to a shaft to intermittently rotate while repeating stop and rotation, a gob supply unit that supplies a gob to one molding die that is stopped, and another molding to which the gob is supplied during the same stop. A pressing machine that presses a mold to perform molding, and a first detector that outputs a signal corresponding to the rotation angle of the output shaft that corresponds to the position in the rotation direction of a turntable that is provided on the output shaft and that rotates intermittently. And controlling the start of the operation of the press machine based on the signal from the first detector, and the gob supply means has a gob cut mechanism operated by a drive motor. Both are provided with a second detector that outputs a signal according to the operating state of the gob cut mechanism, and the rotation start of the turntable is controlled based on the signal from the second detector. Further, the drive unit for driving the turntable is characterized in that the output shaft is provided with a cam having a cam output of 180 ° or more and 270 ° or less.

[0014]

In the glass press molding apparatus configured as described above, the turntable in which a plurality of molding dies are arranged at a predetermined interval on the same circumference is connected to the output shaft of the drive unit to repeatedly stop and rotate. Based on the signal from the first detector provided so as to output the rotation angle signal of the output shaft when performing the molding process by pressing the molding die to which the gob is supplied by the press machine while performing the intermittent rotation. Since the start of the operation of the press machine is controlled by the control unit, the rotation angle of the output shaft of the drive unit corresponding to the position of the turntable in the rotation direction can be known from the rotation angle signal output from the first detector. It is possible to know that the turntable has reached a predetermined position, that is, a predetermined position angle by this, by detecting with the first detector whether the output shaft is at a rotation angle corresponding to this. If the output shaft has a corresponding rotation angle, the operation of the press machine can be started based on this detection result, and based on this, adjustment and setting of the operation timing of the turntable and press machine is easy. In addition, it can be performed accurately and the required molding time can be shortened.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a configuration diagram, and FIG. 2 is a time chart.

In FIGS. 1 and 2, reference numeral 1 is a press forming apparatus, which is equipped with, for example, a hydraulically driven press machine 2. In the press machine 2, a hydraulic cylinder 6 is provided on an upper yoke 5 mounted on a center column 3 and a support column 4, and a pressurizing mechanism 8 is provided on a lower end portion of a plunger 7 that moves forward and backward in the hydraulic cylinder 6. Has been. Whether or not the pressurizing mechanism 8 is located at the most ascended position in the vertical stroke can be detected by the ascended position confirmation sensor 9.

Reference numeral 10 is a turntable provided so that the center column 3 of the press 2 serves as a rotation center axis.
The turntable 10 is driven by the drive unit 11 to perform intermittent rotation in which stop and rotation are repeated in a predetermined cycle. A plurality of molding dies 12 are arranged on the turntable 10 at positions on the same circumference centered on the center of rotation so as to be spaced at predetermined intervals along the circumferential direction. Each of the 12 is a turntable 10
By intermittent rotation, the pressurizing mechanism 8 is stopped at a press forming position directly below the stroke direction.

Further, the drive unit 11 includes a first drive motor 13
And a clutch brake mechanism 17 in which a pulley 14 of the first drive motor 13 and a pulley 15 on the input shaft side are connected by a belt 16, and an output side shaft of the clutch brake mechanism 17 and an input side shaft are connected by a shaft joint 18. The cam output is 180 ° and the index unit 19 is provided.

The index unit 19 is intermittently driven by the clutch brake mechanism 17, and while the index unit 19 is operating, the turntable 10 is rotationally driven via the cam shaft and the output shaft, and the cam shaft makes one rotation and the output shaft becomes The turntable 10 rotates and stops at a predetermined angle by rotating by a predetermined angle. Furthermore, such an operation is repeatedly performed even while the operation of the index unit 19 is stopped.

The output unit of the index unit 19 is directly connected to the first encoder 20 of the first detector which outputs a rotation angle signal according to the rotation angle of the output shaft. As a result, the first encoder 20 outputs a rotation angle signal corresponding to the position in the rotation direction of the turntable 10 that is rotationally driven by the output shaft of the index unit 19.

Then, to determine whether or not the turntable 10 is at a predetermined stop position, that is, at a predetermined stop position angle, the first encoder determines whether or not the output shaft is at a rotation angle corresponding thereto. This can be performed by detecting the rotation angle signal of the output of 20, and the output of the first encoder 20 is input to the sequencer 22 via the first positioner 21. Further, the output of the ascending position confirmation sensor 9 is also input to the sequencer 22.

On the other hand, 23 is a spout for continuously supplying a gob (molten glass lump) 24, and immediately below the spout 23, a gob 24 that has swelled to a predetermined size after a predetermined time has passed after the gob-in. Pair of blades 2 of a gob cutting mechanism 26 that constitutes a gob supply means 25 for shear cutting
7 are provided. The shear cut operation of the blade 27 is performed by being driven by the second drive motor 28, and the gob cut mechanism 26 operated by the second drive motor 28 is provided with the second encoder 29 which is the second detector. Has been.

Then, the second encoder 29 outputs a signal corresponding to the operating state of the gob cutting mechanism 26, for example, a signal at the time of shear cutting the gob 24 by the blade 27 or a signal at a time point after a predetermined time has passed from the shear cutting time. The output is input to the sequencer 22 via the second positioner 30. The output from the sequencer 22 to which the signals from the second positioner 30 and the first positioner 21, the lifted position confirmation sensor 9 and the like are input is the O of the clutch brake mechanism 17.
It is input to the controller 31 which controls the N / OFF operation.

Reference numeral 32 is a chute of the gob supply means 25 for conveying the gob 24, whereby the gob cutting mechanism 2 is provided.
The gob 24 shear-cut by 6 is supplied to the molding die 12 stopped at the gob supply position provided on the turntable 10. In this gob supply position, when the turntable 10 is stopped so that one molding die 12 is located at the press molding position, the molding die 12 that is one before the molding die 12 in the rotation direction is stopped. The molding die 12 after several positions with respect to the rotating direction.
The position where is stopped is the take-out position of the molded glass molded product.

And, in the configuration as described above,
In the molding process focusing on one molding die 12, first, the molding die 12 stopped at the gob supply position is moved to the spout 23.
Receives the shear cut gob 24 from the chute 31. Next, the clutch brake mechanism 17 is operated to rotate the turntable 10 to move the molding die 12 supplied with the gob to the press molding position and stop it.

Then, while stopped at the press-molding position, the pressing mechanism 8 is lowered to press the molding die 12 to which the gob has been supplied to perform molding. After that, the clutch brake mechanism 17 is further operated to rotate the turntable 10 to move the molding die 12 which has completed the molding process to the take-out position and stop it. Then, the glass molding product is taken out from the molding die 12 to complete the molding process. It should be noted that such a molding process is sequentially performed in parallel in each of the plurality of molding dies 12 provided on the turntable 10 and moving intermittently to continuously mold a glass molded product.

The molding process proceeds according to the time chart shown in FIG. That is, when viewed in the middle of the continuous molding process, the gob 24 shear-cut from the spout 23 by the gob cutting mechanism 26 is supplied to the molding die 12 at the gob supply position via the chute 32.

To correspond to this, the gob cut mechanism 26
An output from a second encoder 29 attached to the sequencer 22 is obtained via a second positioner 30.
To 0.2 seconds after the shear cut and turn on the feeder signal. With reference to the time when this feeder signal is turned ON, the clutch brake mechanism 17 is simultaneously turned ON and the ON state is continued for 0.697 seconds, the rotation of the first drive motor 13 is transmitted, and the cam shaft of the index unit 19 is moved. The rotation starts, and the output shaft starts rotating in synchronization with the cam output.

Then, when the cam shaft of the index unit 19 rotates by 10 °, the turntable 10 starts to rotate by being driven by the output shaft of the index unit 19, until the cam shaft further rotates by 180 ° from the time when the cam shaft rotates by 10 °. The turntable 10 rotates and stops for 0.37 seconds. The mold 1 in which the gob 24 is supplied at the gob supply position by rotating the turntable 10.
2 moves to the press molding position and stops.

The fact that the turntable 10 has stopped at a predetermined stop position means that the first encoder 2 corresponding thereto has stopped.
It is detected by outputting the rotation angle signal from 0. The detection output of the first encoder 20 is input to the sequencer 22 via the first positioner 21, and the controller 31 controls the operation of the clutch brake mechanism 17 based on the output of the sequencer 22. Then, the stop state of the turntable 10 is continued for 0.83 seconds until the time when the feeder signal for the next molding process is turned on and the cam shaft rotates 10 °.

When the turntable 10 stops, the pressing mechanism 8 of the pressing machine 2 starts to descend, and the pressing mechanism 8 presses the molding die 12 located at the press molding position to perform the molding process. At the same time, the pressing mechanism 8 is lifted after being pressed during 0.60 seconds after the turntable 10 is stopped. When the ascending position confirmation sensor 9 detects that the pressurizing mechanism 8 has reached the maximum ascending position, a detection signal is input to the sequencer 22 to stop the operation of the press machine 2 and the molding process is completed.
Then, 0.21 seconds after the operation of the press machine 2 is stopped, the feeder signal for the next molding process is turned on.

Further, to the molding die 12 stopped at the gob supply position while the same turntable 10 is stopped, the gob 24 for the next molding is supplied from the spout 23 through the chute 31. Is done. That is, the gob-in from the spout 23 for the next molding process starts 0.1 seconds after the turntable 10 is stopped (0.5 seconds after the reference time), and 0.6 seconds later (after the reference time). After 1.0 second), shear cutting is performed by the gob cutting mechanism 25, and the gob 24 is supplied to the molding die 12.

On the other hand, while the same turntable 10 is stopped, it moves to the take-out position and is stopped from the inside of the molding die 12 where the glass molded product formed by the previous molding process is taken out. .

From the time when the cam shaft rotates 10 °, 3
The clutch brake mechanism 17 is turned off under the control of the controller 31 after 0.31 second has elapsed from the time when the turntable 10 at the time of rotating 30 ° stopped. Then, after the clutch brake mechanism 17 is turned off, the cam shaft is stopped by further rotating 20 °, and while the clutch brake mechanism 17 is in the on state, the cam shaft makes one rotation.

As described above, in the present embodiment, the turntable 10 is intermittently rotated while the index unit 19 is intermittently driven by the clutch brake mechanism 17, and the molding die 12 arranged in the circumferential direction of the turntable 10 is formed. Molding of glass molded products is continuously performed by sequentially moving, stopping, and circulating in a cycle of 1.2 seconds.

Since the gob 24 shear-cut from the spout 23 is supplied to the molding die 12 via the chute 32 during the molding process, the feeder signal to the operating state of the gob cutting mechanism 26 is provided. According to the signal from the second encoder 29 attached thereto, the turntable 1 can be accurately obtained.
The position where 0 rotates by a predetermined angle and stops can be accurately detected by detecting the rotation angle of the output shaft of the index unit 19 that drives the turntable 10 with the first encoder 20.

Therefore, the setting of the timing for starting the rotation of the turntable 10 after the gob-in and the press 2
The timing for starting the operation for the molding process can be easily and accurately set without waiting time. This eliminates the need for a press waiting time when the press machine 2 starts the molding process after the turntable 10 is stopped, and the time required for the molding process can be shortened.

Further, since the cam output of the index unit 19 is 180 °, the time during which the clutch brake mechanism 17 is ON is shortened and the machining efficiency is improved. Further, since the peripheral speed of the turntable 10 is not increased, the gob 24 housed in the molding die 12 does not sway in the molding die 12 and the occurrence of defects in the molded glass molded product is reduced. be able to.

In the above embodiment, the cam output is 1
Although the 80 ° index unit 19 is used, similar effects can be obtained if the cam output is up to 270 °. Further, after the completion of rotation of the turntable 10, a supply request signal (gob in timing) of the gob 24 is output to the gob cut mechanism 26, and this signal is used to output the gob 2
4 may be supplied to the molding die 12 on the turntable 10.

[0040]

As is apparent from the above description, according to the present invention, a turntable in which a plurality of molding dies are arranged at a predetermined interval on the same circumference is connected to the output shaft of the drive unit to stop and rotate. The signal from the first detector provided so as to output the rotation angle signal of the output shaft when the molding die is pressed by pressing the molding die to which the gob is supplied by the press machine while repeating the intermittent rotation By controlling the start of press machine operation based on this, adjustment and setting of the operation timing of the turntable and press machine can be performed easily and accurately, and the time required for molding can be shortened and defects in molded products can be reduced. There are effects such as being able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a time chart according to the present invention.

FIG. 3 is a time chart according to a conventional technique.

[Explanation of symbols]

 2 ... Press machine 8 ... Pressurization mechanism 10 ... Turntable 11 ... Drive part 12 ... Molding die 13 ... First drive motor 17 ... Clutch brake mechanism 19 ... Index unit 20 ... First encoder 21 ... Sequencer 24 ... Gob 25 ... Gob supplying means 26 ... Gob cutting mechanism 28 ... Second drive motor 29 ... Second encoder 31 ... Controller

Claims (3)

[Claims] 1. A plurality of molding dies, a turntable in which the molding dies are arranged at a predetermined interval on the same circumference, and the turntable is intermittently connected to an output shaft so as to repeatedly stop and rotate. Drive part to rotate and 1 at rest
Gob supply means for supplying a gob to one of the molding dies, a press machine for pressing the other molding dies to which the gob has been supplied during the same stop to perform molding, and an intermittent rotation provided on the output shaft. A first detector that outputs a signal corresponding to the rotation angle of the output shaft corresponding to the position of the turntable in the rotation direction, and the operation of the press machine based on the signal from the first detector. A glass press molding apparatus characterized in that the start is controlled. 2. The gob supply means includes a gob cut mechanism operated by a drive motor, and a second detector for outputting a signal according to an operating state of the gob cut mechanism. The signal from the second detector is provided. The press molding apparatus for glass according to claim 1, wherein the start of rotation of the turntable is controlled based on the above. 3. The glass press forming apparatus according to claim 1, wherein the drive unit for driving the turntable includes a cam having a cam output of 180 ° or more and 270 ° or less on the output shaft.