JPH0510725A - Metal web's position detecting method - Google Patents

Abstract

PURPOSE:To provide a metal web's position determining method by which position control the width direction and temporary stop can be carried out surely even if the running metal web is extremely thin and easy to sag. CONSTITUTION:To the surface of a running metal web 1 which contains an exposed metal part 2 and a transparent film surface 3 touching the exposed metal part 2 through a boundary line 11 extended in the longitudinal direction and/or a boundary line 17 extended in the transverse direction, heat-beam 13 is radiated diagonally along the boundary line's 11 direction to contain the boundary line 11 and/or crossing the boundary line 17 from a heat source 12 having different surface temperature from the temperature of the metal web 1. The heat-beam 13 reflected by a spot part 16 containing the boundary line within the radiation surface is detected by a sensor 15 which corresponds to the specific absorption wavelength of the transparent film and based on the output of the sensor, the position in the transverse direction of the metal web 1 is controlled and/or the metal web 1 is stopped running.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to position detection of a running metal web for controlling the widthwise position of a metal web sent to a press or the like for forming a cup-shaped container and for temporarily stopping the web. Regarding the method.

[0002]

2. Description of the Related Art Conventionally, a guide plate is used to position a metal web in the width direction in order to punch a blank from a press or form a cup-shaped body and to feed the metal web into the press. However, when the metal web is extremely thin (for example, about 60 μm) and is easily bent, the portion of the metal web that is in contact with the guide plate is easily deformed, and thus it is difficult to position the guide plate in the width direction. Further, in the past, when the metal web was punched or formed, the temporary stop of the metal web was mainly performed by the pilot pin. However, in this case as well, it is difficult to use the pilot pin for the temporary stop for the same reason.

[0003]

SUMMARY OF THE INVENTION According to the present invention, even if a traveling metal web is extremely thin and easily bent, the metal web can be reliably position-controlled in the width direction and can be temporarily stopped. It is an object of the present invention to provide a positioning method of.

[0004]

A method for detecting the position of a metal web according to the present invention includes a running metal web including an exposed metal portion and a transparent coating surface contacting the exposed metal portion via a boundary line extending in a longitudinal direction. The surface of is irradiated with a heat ray obliquely along the boundary line so as to include the boundary line from a heat source having a surface temperature different from the temperature of the metal web, and the heat ray reflected from the spot part including the boundary line on the irradiation surface is transparent. It is characterized in that it is detected by a sensor sensitive to the characteristic absorption wavelength range of the coating film, and the position in the width direction of the metal web is controlled based on the sensor output. In the present specification, the heat source includes a so-called cold heat source whose surface temperature is lower than the surface temperature of the metal web.

Further, according to the method of detecting the position of a metal web of the present invention, a boundary is formed on the surface of a running metal web including an exposed metal portion and a transparent coating surface contacting the exposed metal portion via a boundary line extending in the width direction. Heat rays are obliquely irradiated from a heat source having a surface temperature different from that of the metal web across the line, and the heat rays reflected from the spot part including the boundary line on the irradiation surface are sensitive to the characteristic absorption wavelength range of the transparent coating film. It is characterized in that it is detected by a sensor and the traveling of the metal web is stopped based on the sensor output.

[0006]

[Function] The surface of the running metal web including the transparent coating film surface which is in contact with the exposed metal portion through the boundary line extending in the longitudinal direction is irradiated with heat rays obliquely along the boundary line so as to include the boundary line. The heat ray reflected from the spot part including the in-plane boundary line is detected by the sensor sensitive to the characteristic absorption wavelength range of the transparent coating film. When the proportion of the exposed metal portion in the spot portion is larger than that of the transparent coating film, the sensor output becomes larger than in the opposite case. Therefore, the sensor output changes depending on the width direction position of the irradiation surface through which the boundary passes. Therefore, by controlling the widthwise position of the metal web so that the sensor output becomes constant, the metal web always runs at a constant widthwise position with respect to, for example, the press.

The surface of the running metal web, including the transparent coating surface that is in contact with the exposed metal portion through the boundary line extending in the width direction, is obliquely irradiated with heat rays across the boundary line, and the boundary line within the irradiated surface is irradiated. The heat ray reflected from the spot portion containing the is detected by a sensor sensitive to the characteristic absorption wavelength range of the transparent coating film. As described above, the sensor output changes depending on the position in the vertical direction (length direction) of the spot portion through which the boundary passes. Therefore, when the sensor output reaches a predetermined value, the driving device can be operated to temporarily stop the traveling of the metal web.

When the temperature of the heat source of the heat ray is equal to the surface temperature of the metal web, the temperature of the heat source must be different from the surface temperature of the metal web because the amount of the reflected heat ray is not changed by the irradiation heat ray.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a metal web made of tin foil (thickness is, for example, about 60 μm), and a plurality of exposed metal parts 2a, one exposed metal part 2b and a plurality of exposed metal are formed on the upper surface. A transparent coating film surface 3 formed by drying and curing a transparent coating material (for example, an epoxyphenol-based coating material) is formed except for the portion 2c. An appropriate protective coating film, for example, a white coating film is formed on the lower surface. A large number of circularly exposed metal portions 2a arranged regularly are pressed from the metal web 1 by a press 10 (FIG. 2).
It is the inner surface of the bottom portion 5a of the cup-shaped container 5 (FIG. 2), which is located at the center of the portion 4 to be a blank to be punched by and is press-molded at the same time as the blank punching. In the sealed container in which the cup-shaped container 5 is filled and sealed with contents such as vegetables and fruits that are easily discolored, the surface tin of the exposed metal portion 2a is
It dissolves in the contents, consumes oxygen, and helps prevent discoloration of the contents. Further, the transparent coating surface 3 (the thickness is, for example, 2 to 8 μm) that covers the inner surface of the body portion 5b of the cup-shaped container 5.
Reduces the damage of the body portion 5b during molding and helps control the amount of tin dissolved by the contents.

The exposed metal portion 2b is in the form of a narrow band (for example, a width of 5 mm) extending in the longitudinal direction along one edge (the right edge in the case of FIG. 1) of the metal web 1. It is used to control the widthwise position of the metal web 1. The exposed metal portion 2c is a horizontally long rectangular shape having a relatively small area (for example, 8 mm in width and 5 mm in length), and the edge portion on the opposite side of the edge portion where the exposed metal portion 2b is located (the left edge portion in the case of FIG. 1). ), One is formed in the middle of each portion 4 which should be a blank adjacent to each other in the traveling direction, and when the cup-shaped container 5 is press-molded, the control for temporarily stopping the metal web 1 is performed. Used.

As shown in FIG. 3, the metal web 1 is coated on a reel 7 with the surface on which the transparent coating surface 3 is formed being unwound by a pinch roll 30 and held at about 40 ° C. A lubricant, preferably palm oil, is applied to the upper and lower surfaces by the oil roll 8, and then sent to the cup molding press 10 via the looper 9 to be molded into the cup-shaped container 5.
Since the lubricant is applied, the surface temperature of the metal web 1 near the inlet of the press 10 is about 40 ° C., which is higher than room temperature.

In order to finely adjust the position of the running metal web 1 in the left-right direction, the looper 9 is a drive unit 6 which can move the entire looper 9 in a direction perpendicular to the traveling direction of the metal web 1.
Is attached. Above the metal web 1 between the looper 9 and the press 10, as shown in FIG. 4, along the boundary line 11 of the strip-shaped exposed metal portion 2b, a heat ray 13 is formed in a direction substantially perpendicular to the boundary line 11. Irradiating the surface with a substantially circular irradiation surface 2
2 (irradiation surface 22 usually has a diameter of about 10 mm), a fixed heat source 12 and a concave mirror 12a, and a spot portion 16 including a boundary line 11 in the irradiation surface 22 (the diameter of the spot portion 16 is usually about 1 to 10 mm). Heat ray 1 reflected from 10 mm)
A convex lens 14 and a sensor 15 (made of, for example, a thermopile) for collecting and detecting 3 are provided. The convex lens 14 is made of a material capable of transmitting the absorption wavelength range of the transparent coating film.

Further, in the vicinity of the heat source 12, heat rays are irradiated obliquely in a direction substantially perpendicular to the downstream boundary line 17 of each rectangular exposed metal portion 2c, and a substantially circular irradiation surface (not shown; irradiation). A heat source 21 (FIG. 3) similar to the heat source 12 and a concave mirror (not shown) for forming a surface diameter (usually about 10 mm), and a spot portion 18 (FIG. 1; spot) including a boundary line 17 in the irradiation surface. The diameter of the part 18 is usually about 1
Sensor 15 for detecting heat rays reflected from 10 mm)
A sensor (not shown) similar to the above is provided. A temperature sensor 19 (usually an infrared radiation thermometer) for measuring the surface temperature of the metal web 1 near the spots 16 and 18 is provided.

As shown in FIG. 4, a heat source 12 (for example, an infrared heater having a surface temperature of about 200 to 300 ° C.) and a concave mirror 12
The a and the convex lens 14 are arranged so that the boundary line 11 passes through the center 16a of the spot portion 16 in the normal state (see FIG. 1), but in actual work, because the metal web 1 rolls, The often-boundary line 11 is displaced from the center 16a.
In the press 10, when the boundary line 11 passes through the center 16a,
The exposed metal portion 2a is adjusted so that the blank portion 4 is punched so that the exposed metal portion 2a is located at the center of the blank.
Therefore, when the boundary line 11 is displaced from the center 16a, the exposed metal portion 2a is displaced from the inner surface of the bottom portion 5a of the cup-shaped container 5. This is not preferable because it deteriorates the quality and appearance of the cup-shaped container 5 and reduces the commercial value. In order to increase the difference in reflectance between the exposed metal portion 2 and the transparent coating film surface 3, it is preferable to irradiate a blurred light beam and collect the reflected light from the spot portion 16 having a narrow area.

The transparent coating film on the transparent coating film surface 3 is generally 6-1.
It has a characteristic wavelength absorption region of 2 μm. Therefore, the sensor 15
When using a material having a property of absorbing a wavelength of 6 to 12 μm (for example, a thermopile), and letting the diameter of the spot portion 16 be d, when the spot portion 16 is entirely on the transparent coating film surface 3, that is, In FIG. 5, when the position of the boundary line 11 is 0 and the right end of the spot portion 16 is on the left of the position 0, the sensor output V is at a low level of VL. On the other hand, when the entire spot portion 16 is above the strip-shaped exposed metal portion 2b, that is, the left end of the spot portion 16 is located at the position r.
To the right, the sensor output V is at a high level of VH.

When the center 16a of the spot portion 16 is above the boundary line 11, the sensor output V is VL / 2 + VH.
/ 2 = VM. The curve 20 in FIG. 5 is the metal web 1
If the surface temperature is at a reference temperature T0 (for example, 20 ° C.) and the surface temperature is away from the reference temperature and is higher than the reference temperature, for example, as shown by the curve 20 ′, the entire curve 20 is Rises from V to V'by Vx, and VL, VH and VM become V'L, V'H and V'M, respectively.

In FIG. 6, 25 is an infrared radiation thermometer 1
Based on the voltage signal V1 based on the surface temperature T of the metal web 1 measured at 9, the sensor output V at the reference temperature T0
The signal −Vx from the calculation circuit 25 is a calculation circuit for calculating the difference Vx between the (curve 20) and the actual sensor output V ′ (curve 20 ′). On the other hand, since the signal VM obtained for the reference temperature T0 is also input to the differential amplifier 26, the differential amplifier 26 outputs the difference between VM and -Vx, that is, (VM + Vx) = V'M to the differential amplifier 27.

The output V'of the sensor 15 is applied to the differential amplifier 27.
Also, V'-V'M is calculated here, that is, in FIG. 5, the entire curve 20 'becomes a curve 20 "which is lowered until the voltage of V'M becomes 0, and V' When M reaches the level of voltage 0, it becomes V ″ M. When the output voltage V ″ of the differential amplifier 27 is 0, the driving device 6 does not operate,
When V ″ becomes +, the metal web 1 is slightly moved to the right with respect to the traveling direction A by the drive device 6 until V ″ becomes almost 0, while when V ″ becomes −, the drive device 6 changes V ″. The metal web 1 is slightly moved to the left with respect to the traveling direction A until it becomes almost 0, and the boundary line 11 is always substantially the spot portion 16.
It is controlled so as to pass through the center 16a.

A similar electric circuit is provided for a sensor (not shown) for the spot portion 18, and when a 0 signal is output from a differential amplifier (not shown) corresponding to the differential amplifier 27, a driving device (not shown). ) Temporarily stops the progress of the metal web 1. During the stop period, the press 10 has, for example, the spot portion 18 at the position shown in FIG.
While the center 18a of the spot portion 18 is on the downstream boundary line 17 of the exposed metal portion 2c, blanks are punched from the portions 4a and 4b of the metal web 1 and at the same time, the cup-shaped container 5 is formed and punched (not shown). When the lower end of) reaches a level above the metal web 1, the metal web 1 starts traveling again.

The present invention is not limited to the above embodiments, and the heat source may be a so-called cold heat source lower than the surface temperature of the metal web, for example, a water-cooled copper pipe. Also in this case, the sensor may be of the same type as described above.

[0021]

The metal web positioning method of the present invention comprises:
Even if the traveling metal web is extremely thin and easily bent, the position control in the width direction and the temporary stop can be reliably performed.

[Brief description of drawings]

FIG. 1 is a plan view of an example of a surface of a metal web applied to the present invention.

2 is a vertical cross-sectional view of an example of a cup-shaped container formed from the metal web of FIG.

FIG. 3 is a front view for explaining an example of an apparatus for feeding the metal web of FIG. 1 into a press.

FIG. 4 is a longitudinal sectional view for explaining a main part showing a state of irradiating the metal web of FIG. 1 with a heat ray.

FIG. 5 is a diagram showing an example of the relationship between the width direction position of the boundary line of the metal web with respect to the spot portion and the sensor output.

FIG. 6 is an electric circuit diagram showing an example for performing temperature correction or the like on a sensor output signal.

[Explanation of symbols]

1 metal web 2 exposed metal parts 3 Transparent coating surface 11 border 12 heat sources 13 heat rays 15 sensors 16 spots 17 border 18 spots

Claims (2)

[Claims] 1. A surface of a running metal web, including an exposed metal portion and a transparent coating surface contacting the exposed metal portion via a boundary line extending in the longitudinal direction, along the boundary line so as to include the boundary line. Irradiate heat rays obliquely from a heat source with a surface temperature different from the temperature of the metal web, and detect the heat rays reflected from the spot part including the boundary line on the irradiation surface with a sensor sensitive to the characteristic absorption wavelength range of the transparent coating film, A method for detecting a position of a metal web, which comprises controlling a position in the width direction of the metal web based on a sensor output. 2. A surface of a running metal web, including an exposed metal portion and a transparent coating surface contacting the exposed metal portion through a boundary line extending in the width direction, crosses the boundary line and the temperature of the metal web. Irradiate heat rays obliquely from heat sources with different surface temperatures,
Metals characterized by detecting heat rays reflected from spots including the boundary line on the irradiation surface with a sensor sensitive to the characteristic absorption wavelength range of the transparent coating film and stopping the traveling of the metal web based on the sensor output. Web position detection method.