JPH1029827A - Wrapping detector of glass band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the trouble of the conventional known means that rapid detecting of the wrapping and building up of glass around rolls and the dealing therewith are not possible with the conventional means. SOLUTION: This device detects the wrapping of a glass band on the upper forming roll at the time of forming the glass band 4 by passing fused glass 1 between the upper and lower forming rolls 2 and 3. In such a case, a light projector 8 is arranged on one side in the longitudinal direction of the upper forming roll in order to arrange the optical path of a light beam running in the transverse direction of the glass blank in a downstream region right after drawing out of the upper forming roll and slightly above the glass blank and a photodetector 9 is arranged on the other side. The light beam is shut off or the photodetecting quantity is changed by the occurrence of the wrapping of the glass band on the upper forming roll 2 or the build-up 7 of the glass band thereon, by which the abnormality is detected and a detection signal is obtd. to trigger an alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting winding of a glass strip around a roll when a glass sheet is manufactured by a so-called roll-out method, such as a molded glass sheet, a polished glass sheet, a netted glass sheet and the like.

[0002]

2. Description of the Related Art When a glass sheet is produced by a roll-out method in which a glass band is drawn from the upper and lower forming rolls, a glass band in a thermoplastic state is often wound around an upper forming roll.

In the side view and plan view of FIGS. 1 and 2, the molten glass 1 flowing out of a melting furnace (not shown)
Is passed through the upper and lower forming rolls 2 and 3, is made into a desired thickness, and is drawn out in the state of the glass strip 4. The glass strip 4 is transferred on a roll group 6 via a plate 5, cooled through an annealing furnace (not shown), cut into a predetermined size in a cutting process, and stored.

In FIG. 1, a broken line 7 shows a swelling before the winding of the glass strip 4 around the forming roll 2. Winding and subsequent plate making become impossible, the roll is damaged, and time and labor are required for recovery, and a great deal of waste is required for repair.

In Japanese Patent Publication No. 52-17843, in order to prevent winding of a glass plate, a current-carrying detecting element is disposed in advance slightly above both ends of a glass strip. It is disclosed that, when a detection element is brought into contact with and energized, a detection signal is obtained and the forming roll is rotated at a reduced speed or stopped.

However, the swelling of the glass starts from a local area and extends up to the entire width of the glass band, and in order to quickly detect the local swelling, a large number of detecting elements must be mounted at small intervals in the width direction. . In addition, there are many disadvantages such as the necessity of removing and cleaning the glass of the detection element after contact.

The present invention has been made in view of the above-mentioned problems, and has the effect that the abnormality can be quickly and easily detected with a simple technique, so that the response can be performed promptly and waste can be minimized. To play.

[0008]

SUMMARY OF THE INVENTION The present invention provides a method for forming a glass strip by passing molten glass between upper and lower forming rolls.
An apparatus for detecting winding of a glass band around an upper forming roll, the optical path of a light beam running in the width direction of the glass band in a downstream region immediately after the upper forming roll is pulled out and slightly above the glass band. A light projecting device is arranged on one side in the longitudinal direction of the upper forming roll, and a light receiving device is arranged on the other side, so that the glass band is wound around the upper forming roll, a swell is generated, and the light beam is interrupted or received. An abnormality is detected by the change in the amount, and the detection signal is used to obtain the detection signal and the alarm is activated. In response to the detection signal, the roll driving device is controlled, and the upper and lower forming rolls and the downstream transport roll are rotated at a reduced speed or stopped.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. 1 and 2, the relationship between the glass strip 4 and the forming rolls 2 and 3 is as described above, and reference numeral 8 denotes a light emitting device, for example, a laser transmitting device in the detecting device, and the light is transmitted through a light emitting amplifier 8 '. A light beam is emitted from the optical device 8. Reference numeral 9 denotes a light receiving device. Light from the light projecting device 8, for example, a laser beam, is captured by the light receiving device 9, detected via the light receiving amplifier 9 ′, and detected by the recording device 10.

A bulge 7 of the glass strip 4 is generated, and the bulge 7 is gradually increased, whereby the light from the light projecting device 8 is gradually blocked, and the amount of light received by the light receiving device 9 changes. When the amount of received light decreases below the light amount level set in advance, that is, when an abnormality occurs, the alarm device 11 operates according to a detection signal from the detection and recording device 10, and issues an alarm. Alternatively, furthermore, upon receiving the detection signal from the recording / recording device 10, the roll driving device 13 decelerates the driving of the forming rolls 2, 3 and the downstream conveying roll 6 via the roll driving mechanism 12. Turn or stop.

The present invention is configured as described above.
Early recovery of the winding of the glass strip on the roll is facilitated by catching it early, issuing an alarm or further controlling the roll drive, thereby facilitating the return operation. This has the effect of minimizing damage and damage.

[0012]

According to the present invention, the return operation can be performed by quickly catching the glass band around the roll at an early stage, issuing an alarm, or further controlling the roll drive. This makes it possible to minimize damage and damage caused by winding.

[Brief description of the drawings]

FIG. 1 is a side view according to the present invention.

FIG. 2 is a plan view corresponding to FIG.

[Explanation of symbols]

 1 ---- Molten glass 2,3 --- Forming roll 4 ---- Glass band 7 ---- Growth of glass 8 ---- Light emitting device 9 ---- Light receiving device

Claims (2)

[Claims] An apparatus for detecting winding of a glass band around an upper forming roll when a molten glass is passed between upper and lower forming rolls to form a glass band. A light projecting device is arranged on one side in the longitudinal direction of the upper forming roll, and a light receiving device is arranged on the other side so as to arrange an optical path of a light beam running in the width direction of the glass band slightly above the glass band. Then, the glass band is wound around the upper forming roll, a bulge occurs, the light beam is interrupted, or an abnormality is detected due to a change in the amount of received light, and an alarm is activated upon obtaining the detection signal. A device for detecting winding of a glass strip. 2. A winding of a glass strip is detected, and a roll driving device is controlled based on the detection signal, thereby forming upper and lower forming rolls.
2. The winding detecting device for a glass band according to claim 1, wherein the conveying roll on the downstream side is decelerated or stopped.