JPS6353293A - Edge mask device - Google Patents

Abstract

PURPOSE:To enable adequate and exact positioning of an edge mask by providing a control means for changing the position of a supporting means in the transverse direction of a metallic strip when the edge mask supported by the supporting means contacts the strip. CONSTITUTION:The edge mask 1 is supported by the supporting part 5 suspended from a shaft 6 and is held at the prescribed angle (usually a right angle) with the metallic strip 2. The mask moves around the shaft 6 to the position shown in figure by a broken line in an arrow direction when the mask 1 contacts the edge end of the strip 2 by the width change or meandering of the strip 2. The angular change of the shaft 6 is transmitted by a rotation taking out mechanism 10 to an angle detector 11 which converts the change to an electric signal. A position controller 12 emits an operation command to a position mechanism 13 upon receipt of the signal. A bearing 7 mounted to the front end of a connecting part 15 is moved by said command, by which the supporting part itself is reset to the position perpendicular to the metallic strip 2. The mask 1 is thereby accurately and adequately positioned to the edge of the strip 2.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an edge mask device, and in particular, the edge mask prevents excessive plating at the edge of a metal strip such as a steel plate (hereinafter referred to as a metal strip) by covering the edge of the slope. The present invention relates to an improvement of an edge mask device configured to do so.

[Conventional technology]

If the metal strip is not plated by electroplating,
A phenomenon called edge overcoat occurs in which current flows in a concentrated manner near the edges, causing the plating to become excessively thick only at the edges. Therefore, problems occur such as having to remove this edge portion as a defective portion. An edge mask device is one of the methods for preventing this edge overcoat. What is the edge mask device?
As shown in the figure, the edge portion of the metal strip 2 is covered with a cover 1 called an edge mask made of an insulating material.
This prevents current concentration. Edge masks can be of various shapes, such as a linear shape as shown in the figure (A), or a serrated shape as shown in the figure (B). If the edge mask 1 is not properly positioned at the edge of the metal strip 2, its effectiveness will be reduced.However, as shown in FIG. Since the electrodes 3 are arranged above and below and the installation space is narrow, the metal strip 2
In order to detect the edge portion of the image and correctly position the edge mask 1 at the edge portion, various considerations are required. Conventionally, regarding the positioning control of this edge mask, for example, Japanese Patent Application Laid-Open No. 100693/1983 and Japanese Utility Model Publication No. 58-2
There is a technique disclosed in Japanese Patent No. 7022. The technique disclosed in Japanese Patent Application Laid-Open No. 100693/1983 measures the potential between the plated copper strip and the edge mask, and controls the position of the edge mask based on this potential. On the other hand, in the technique disclosed in Japanese Utility Model Publication No. 58-27022, air headers each having a slit nozzle are provided opposite to each other with a metal strip at the center to detect the edge position of the strip.

Problem to be Solved by the Invention 1 However, in the technique disclosed in JP-A-60-100693, chemicals in the plating solution are deposited on the electrode surface, making it difficult to measure the potential over time. There was a problem that it became impossible to perform the process accurately. On the other hand, in the so-called air senna type technology disclosed in the above-mentioned Japanese Utility Model Publication No. 58-27022, in order to improve the detection accuracy, the distance between the strip and the air header must be made extremely small. If the shape of the metal strip is bad, the metal strip and air header will come into contact and break.
There was a problem that there was a risk of q. By the way, this Japanese Utility Model Publication No. 58-27022 proposes installing a cleaning nozzle in order to clean the chemicals if they are precipitated and lost. It is theoretically possible to apply it to solving the problems of the above-mentioned Japanese Patent Application Laid-open No. 11U60-100693.However, as mentioned above, it is extremely difficult in practice to arrange such a cleaning device in a narrow installation space. [Object of the Invention] The present invention has been made in view of such conventional problems, and has a simple configuration, high accuracy, and always maintains high edge detection accuracy. An object of the present invention is to provide an edge mask device that does not require time and effort for maintenance. In an edge mask device configured to prevent excessive plating at the edge portion of a metal strip, edge mask support means is installed to support the edge mask and maintain a predetermined angle with respect to the metal strip; contact detection means for detecting that the edge mask has come into contact with the edge end of the metal strip by a change in the predetermined angle in the edge mask support means, based on a signal value of the contact detection means; The position of the question in the width direction of the metal strip of the edge mask support means itself is changed.
The above object is achieved by providing a position control means for controlling the position. [Function 1] In the present invention, edge edge detection for properly positioning the edge mask on the edge portion of the metal strip is performed.
This is done using the edge mask itself, and the positioning of the edge mask is performed based on the detection results. That is, the edge mask support means supporting the edge mask is set to maintain a predetermined angle with respect to the metal strip. As a result, by detecting a change in this predetermined angle, it can be determined that the edge mask has contacted the edge of the metal strip. Therefore, the edge mask (edge mask supporting means) itself is advanced until it comes into contact with the metal strip, and after detecting the edge end of the metal strip, the edge mask (
By controlling the edge mask supporting means) to a predetermined position, the edge mask can be accurately and properly positioned at the edge portion of the money strip. [Embodiments] Examples of the present invention will be described in detail below based on the drawings. FIG. 1 is a schematic sectional view partially showing a block diagram, showing an embodiment of an edge mask device according to the present invention. The edge mask 1 is suspended from a shaft 6 by a support 5. Reference numeral 7 is a bearing that receives this shaft 6. This support part 5 is paired with the $E strip 2. In order to maintain the position at a predetermined angle (usually a right angle), a spring 8 that moves in both pushing and pulling directions is disposed between a connecting part 15 and a supporting part 5 that constitute a positioning mechanism 13, which will be described later. ing. When the edge mask 1 is not in contact with the metal strip 2, the support 5 is in a position perpendicular to the metal strip 2. However, if the edge end of the metal strip 2 comes into contact with the edge mask 1 due to the metal strip 2 meandering or the width of the joint strip itself changing, the edge mask is pushed and the support □ portion 5 forms a broken line with the shaft 6 as the center. Rotate and move in the direction of the arrow as shown. This angular change of the shaft 6 is transmitted to the angle detection device 11 by a rotation extractor 10 such as a gear or shaft, and converted into an electrical signal. In response to this electric signal, the position control device 12 issues a three-move command to the cylinder or motor shade positioning IR structure 13, and in response to this command, the connecting portion 15 moves in the direction of the arrow ( width direction of the metal strip 2). That is, the position control device 12 commands the positioning mechanism 13 to move backward until the bearing 7 attached to the tip of the connecting portion 15 is bent and the support portion 5 itself returns to the position perpendicular to the money strip 2. It continues to produce. Next, a specific method of using the above device will be explained below. When the width of the metal strip 2 is changed to a wider one, the edge mask 1 is retreated to a position wider than the next strip width by a certain amount of margin (usually 10 to 50 nm) in response to a width change notice signal. For this purpose, the position detection device 14 detects the moving claw of the positioning condylar structure 13, and the position 1tll l2II device 12
An operation command is issued to the positioning opening groove 13 until the edge mask 1 comes to a predetermined position retracted by an allowance. When the strip width change point, that is, the welding point, has passed, the position control device 12 issues a command to advance the edge mask 1, and the edge mask 1 contacts the strip 12, and the angle changes according to the angle detection signal, that is, the edge mask 1 The edge mask 1 is brought closer to the metal strip 2 side until it receives a signal that the metal strip 2 has contacted the edge end of the metal strip 2. When the metal strip 2 and the edge mask 1 come into contact, the position control 2 (I device 12 moves the edge mask 1 Generally, in order to prevent wear of the edge mask 1, at this point the edge mask 1 is moved a few meters away from the money strip 2.
so that it retreats from the edge of the Through this series of operations, the edge mask 1 will be set to the desired level. If the meandering of the money strip 2 or fluctuations in the strip width occur frequently, perform the above operations at regular intervals, that is, set the edge mask to the desired level. All you have to do is move the edge mask 1 forward and stop when it contacts the money strip 2, or move it back and forth a few mm.As a result, the edge mask 1 is always placed at the edge of the money strip 2 (<l i or from the edge end to vi
, mu jNl. FIG. 2 shows a second embodiment of the invention. In this second embodiment, since it is difficult to support the edge mask 1 before and after the electrode 3, the edge mask 1 is supported by an L-shaped support portion 5Δ from the side surface of the electrode 3. This angle change of the support part 5A may be detected by an angle detection device as in the first embodiment, or as shown in FIG. The distance N [may be detected by the detector 16. In this second embodiment, as a means for maintaining the support portion 5Δ at a predetermined angle with respect to the metal strip 2, a ledge 9 balanced with the edge mask 1 is used instead of a spring. , J3, position control, positioning rock structure, and method of use are the same as in the previous embodiment, so illustrations and explanations will be omitted. FIG. 5 shows an example in which the edge mask devices shown in FIG. 1 are arranged at both left and right ends of the metal strip 2. In FIG. Actually, what about the plating cell? ! Generally, two or more devices are used, and a plurality of the same devices are arranged in front and behind, but they are omitted from the figure. An optical strip width detector 20 is installed in front of these plating cells in a place where there are no obstacles around the metal strip 2 and a good measurement environment. The strip width calculator 21 calculates the width of the metal strip 2 from the signal from the strip width detector 20. When receiving a signal from the strip width calculator 21 that the width of the metal strip 2 has changed, the both end position control table r22 calculates the change point 24 of the width of the strip from the signal from the strip speed detector 23.
In addition to calculating the time required to reach the plating cell, the both end position control device 22 also calculates the time required to reach the plating cell. At the same time, position control devices 12.12- are placed at both left and right ends of the metal strip 2.
Then issue a command to retract the edge mask 1.1' to a position wider than the next strip width by an allowance. The margin is provided because the shape of the strip is poor before and after the strip width change point 24, and the strip often meanderes by about +11. After that, when the strip width change point 24 passes the plating cell concerned, the position control device 12.12' moves the edge mask 1 forward to a position where it contacts the strip, and upon contact, receives a signal from the angle detector 11 and moves the edge mask 1 to stop. Or, at this stage, let it run out after just a few wings. This operation is performed separately at the left and right ends. This is because the metal strip 2 does not necessarily run through the center of the plating cell. When there are a plurality of plating cells, the position control device 22 controls the left and right positions of each plating cell one after another in synchronization with the timing of passing the width change point 24.
A command is issued to 12' and similar control is performed. After passing the strip width change point 24, there is almost no change in the width of the metal strip 2, so it is only necessary to change the settings of the edge mask 1 for the meandering of the metal strip 2. If the metal strip 2 snakes, the strip 2 will come into contact with either the left or right edge mask 1.1', and the support portion 5.5' will tilt, causing the angle detection 8ii! ! 11.11'
It is detected by FIG. 5 shows an example in which the metal strip 2 meanders to the right in the figure. At this time, the left edge mask 1' is separated from the metal strip 2 by the amount of the meandering of the metal strip 2. At this time, the right position control device 12 determines the right position.
At the same time as sending a reverse signal to
A signal is also sent to 2' to move the left edge mask 1' forward. Finally, by moving the left and right edge masks 1.1' in the same direction by the same distance, the right support part 5
When the edge mask 1- becomes vertical, the left edge mask 1- contacts the metal strip 2. In this way, by following and moving the opposite side in parallel based on the information on the contacted side, it is possible to appropriately respond to the meandering of the metal strip 2. Of course, when the metal strip 2 comes into contact with either the left or right edge mask, the opposite side position □Control III
It is also possible to perform control such that a resetting instruction is sent to the gastric cavity, and the edge mask remote from the strip is advanced until it comes into contact with the strip. The present invention does not limit the specific control system in which the edge mask device according to the present invention is used. (Effect 1 of the Invention As explained above, according to the present invention, edge detection for properly setting the edge mask immediately between the edges of the metal strip can be performed using the edge mask itself, which is expensive. An excellent effect can be obtained in that the trouble of installing an edge sensor that is difficult to install every month and maintaining the edge sensor in a plating solution so that its accuracy can be maintained at all times can be saved.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view including a partial block diagram showing the configuration of an Edge Masmo embodiment according to the present invention;
FIG. 2 is a schematic sectional view, not showing the second embodiment of the present invention, and FIG.
The figure is a perspective view, not showing the structure of a conventional edge mask, FIG. 4 is a cross-sectional view, and FIG. 5 is a perspective view for explaining a specific method of using the embodiment device shown in FIG. It is. DESCRIPTION OF SYMBOLS 1... Edge mask, 2... Metal strip, 3... Electrode, 4... Plating solution, 5... Support part, 6... Shaft, 7... Bearing, 8... Spring , 9... Counter weight, 10... Rotation take-out mechanism, 11... Angle detection device, 12... Position control device, 13... Positioning mechanism, 15... Connection part, 1q... Carp detector.

Claims (1)

[Claims] (1) An edge mask device configured to prevent excessive plating at the edge portion of the metal strip by covering the edge portion of the metal strip with an edge mask, which supports the edge mask and the metal strip. edge mask support means installed to maintain a predetermined angle with respect to the metal strip; and a position control means for changing and controlling the installation position of the edge mask support means itself in the width direction of the metal strip based on the signal value of the contact detection means. Characteristic edge mask device.