JPS63131002A - Apparatus for detecting change in thickness of strip like continuous body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thickness change detection device for detecting a thickness change of a long strip-shaped continuous body such as a lead frame.

(Prior Art) Conventionally, lead frames and the like are continuously processed and manufactured using long continuous strips as raw materials. In order to enable long-term continuous processing, this long strip-shaped continuous body is formed by overlapping the ends of continuous bodies of a predetermined length and joining them by spot welding, etc. A change in plate thickness occurs. Therefore, in order to continuously and smoothly perform processing such as press working and plating using these strip-shaped continuous bodies, it is necessary to detect joint portions in advance and take appropriate measures.

Methods for detecting seams of these continuous strips, sudden changes in thickness, foreign objects on the continuous strips, sudden changes in thickness such as flakes, etc. include a method of detecting by directly contacting the continuous strips;
Although there is a method of detecting without contacting the continuous strip, the present invention relates to the former method of detecting by directly contacting the material.

FIG. 3 is an explanatory diagram showing a conventional device for detecting thickness changes of seams, etc. In the figure, 1 is a belt-shaped continuous body that is the object to be detected,
2 is a movable roller that comes into contact with the lower surface of the continuous strip 1, and 3 is an adjustment screw that adjusts the position of the movable roller 2 up and down. 4
is a swinging roller that is pivotally supported by the bent portion of the L-shaped arm 5, and the L-shaped arm 5 freely rotates around a fulcrum 6.

7 is a fixed switch that comes into contact with the top of the L-shaped arm;
The side surface of the L-shaped arm 5 is pressed against the fixed switch 7 by the spring 8 .

In the conventional detection device shown in FIG. 3, when the joint 9 of the continuous strip 1 passes between the movable roller 2 and the swinging roller 4, the thickness of the joint 9 causes the swinging roller 4 to move upward. The joint is detected when the L-shaped arm 5 rotates and the side surface of the arm separates from the fixed switch 7.

(Problems to be Solved by the Invention) However, in the conventional example described above, there is a problem in that when the thickness of the material of the object to be detected changes, the seam detection level must be reset each time.

In other words, the thickness of the joint portion of the object to be detected is equal to the thickness of the material 1.
Considering that the seam detection level is about twice as large as
It is impossible to detect seams. For example, if the thickness of the material is 0.1 mm, the detection level is 0.11<t
, <0.2 mm, and if a 0.5 mm material were to be run at the detection level set in this manner, the L-shaped arm would always move away from the fixed switch, making it impossible to detect the seam. For this reason, the detection level must be reset each time the material thickness differs.

As described above, the conventional thickness change detection device for seams, etc. has problems in that the allowable range for detecting thickness changes is narrow, and it requires a complicated operation to set the detection level.

The present invention has been made to solve the above-mentioned problems, and its purpose is to solve the problem at joints or sudden changes in thickness, regardless of the inherent thickness of the strip-like continuous body that is the object to be detected. It is an object of the present invention to provide a thickness change detecting device for a continuous strip that can reliably detect abnormalities such as foreign objects and particles.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

That is, in a continuous strip thickness change detection device that detects a change in thickness of a continuous strip, a first fixed roller and a second fixed roller that come into contact with one surface of the continuous strip, which is an object to be detected, are separated by a predetermined interval. The first swing roller and the second swing roller are fixed to each other and are positioned opposite to each of the first fixed roller and the second fixed roller with the strip-shaped continuous body in between, so that the first swing roller and the second swing roller can swing freely as appropriate members. The first swing roller and the second swing roller are respectively supported pivotably on L-shaped first and second arms, and when the first swing roller and the second swing roller swing due to a change in the thickness of the strip continuous body, the first swing roller and the second swing roller swing. A biasing means for pivotally supporting the first arm and the second arm so that the arms and the second arm both swing in the same direction, and returning the first arm and the second arm from the swinging position to a predetermined position. The first arm is formed when the thickness changing portion of the continuous strip passes between either the first fixed roller and the first swinging roller or between the second fixed roller and the second swinging roller. The present invention is characterized in that a detecting means is provided for detecting a change in the distance between the first arm and the second arm.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing an embodiment of a thickness change detection device for a strip-like continuous body according to the present invention.

Reference numeral 10 denotes a band-shaped continuous body, which is an object to be detected for detecting seams, sudden changes in thickness, foreign objects, particles, etc. In the figure, the detected object 10 is running from left to right. Reference numeral 11 denotes a seam protruding onto the detected object 10, which is a thick part of the detected object 10.

12a and 14a are a first swinging roller and a first fixed roller that pinch the detected object 10 from above and below in the vertical direction, 12a is a swinging roller that moves on the upper surface of the detected object 10, and 14a is a This is a fixed roller that comes into contact with the lower surface of the object 10 to be detected. Further, 12b and 14b are a second swinging roller and a second swinging roller that pinch the detected object 10 from the upper and lower surfaces.
The rollers are fixed rollers, and are arranged at predetermined intervals from the first swinging roller 12a and the first fixed roller 14a, respectively. The second swinging roller 12b is a swinging roller that moves on the upper surface of the detected object 10, and the second fixed roller is a fixed roller that comes into contact with the lower surface of the detected object 10.

Reference numeral 16 denotes a first arm to which the first swinging roller 12a is pivoted. This first arm 16 is an L-shaped arm,
It consists of a vertical arm extending vertically upward perpendicular to the traveling direction of the detected object 10 and a horizontal arm extending parallel to the detected object 10 in the direction in which the detected object 10 enters.

Reference numeral 18 denotes a fulcrum that pivotally supports the end of the horizontal arm, and this fulcrum 18 is fixed to a frame (not shown).

A coil spring 20 is fixed to the top of the first arm 16, and is fixed to the frame by urging the first arm 16 to rotate clockwise in the figure. A contact piece 22 is fixed to the side surface near the upper end of the first arm 16, and projects somewhat from the inner side surface of the first arm 16.

The first swinging roller 12a is pivotally attached to a bent portion of the first arm 16.

Reference numeral 24 denotes a second arm to which the second swinging roller 12b is attached. This second arm 24 is an L-shaped arm similar to the first arm 16, and consists of a horizontal arm and a vertical arm. The second arm 24 is pivoted at a bent portion of the arm as a fulcrum, and the second swinging roller 12b is pivoted to the end of the horizontal arm. 26 is a fulcrum that pivotally supports the bent portion of the second arm 24, and this fulcrum 26 is attached to the frame (
(not shown).

A switch 28 is installed at the upper end of the vertical arm of the second arm 24, and is located opposite the contact piece 22 on the first arm 16. In the normal position, the first arm 16 and the second arm 24 are arranged in parallel at substantially equal intervals, and the switch 28 and the contact piece 22 are arranged so as to be in contact with each other without detecting the seam.

Next, the operation of the above-described embodiment will be explained.

The tensile force of the coil spring 20 is applied to the first arm 16
The first swinging roller 12a and the second swinging roller 12b act as a pressing force via the second arm 24 and the lever mechanism to push the first swinging roller 12a and the second swinging roller 12b toward the first fixed roller 14a and the second fixed roller 14b. Therefore, when the detected object 10 is transported by an external device, the first swinging roller 12a
The second swinging roller 12b always pinches the detected object 10, and the first swinging roller 12a and the second swinging roller 12
b is constantly in contact with the detected object 10 while transferring.

■ Before the joint 11 of the detected object 10 enters the first swinging roller 12a, that is, when the plate thicknesses at point A and point B are the same, the first arm 16 and the second arm 24 are almost parallel to each other. The contact piece 22 and the switch 28 are in contact with each other. That is, the contact between the contact piece 22 and the switch 28 makes it possible to determine that the plate thicknesses at point A and point B are the same.

(2) FIG. 2 shows a state in which the seam 11 has entered the first swinging roller 12a and is sandwiched between the first swinging roller 12a and the first fixed roller 14a.

At this time, the first swinging roller 12a is lifted by the thickness of the seam 11, and the first arm 16 rotates slightly counterclockwise about the fulcrum 18.

Since the first arm 16 has a long vertical arm, when the first swinging roller 12a swings only slightly,
The vertical arm is largely displaced, and the contact piece 22 and switch 28
are separated. This makes it possible to detect the difference in plate thickness between point A and point B, that is, the seam 11 of 1° of the object to be detected.

■ When the seam 11 is between the first swinging roller 12a and the second swinging roller 12b, that is, between points A and B, the plate thicknesses at points A and B are the same, so the contact piece 22 and the switch 28 comes into contact. This is the same as the state (■).

■ When the seam 11 is sandwiched between the second swinging roller 12b and the second fixed roller 14b, the second swinging roller 12b is lifted by the thickness of the seam 11, and the second arm 24 is rotated counterclockwise. let At this time, the switch 28 presses the contact piece 22. Therefore, in this case as well, the switch 28
The contact piece 22 maintains a state of contact.

(2) After the seam 11 passes through the second swinging roller 12b, it returns to the same state as (2).

In this embodiment, there is a seam 1 on the first swinging roller 12a.
The contact between the contact piece 22 and the switch 28 is released only when the switch 1 enters, and the seam can thereby be determined. The feature of the above-mentioned configuration is that the seam is detected by sensing the difference in plate thickness between points A and B.
Seams can be detected without being affected by the thickness inherent to the object to be detected 10.

According to the detection method according to the present invention, each member can be arranged in various ways. For example, if each member of the above-mentioned embodiment is arranged in a horizontally reversed position, when the seam passes through the roller on the exit side, It is possible to detect the seam, and it is also possible to detect the seam by arranging each member below the object to be detected.

Further, the set positions of the contact piece 22 and the coil spring 28 may be exchanged, or an elastic spring may be used as the coil spring 28 and attached so as to constantly press the first arm 16 clockwise in FIG. It is also possible to set it up. Moreover, due to its configuration, the thickness change detection device of this embodiment not only detects the seam of the continuous strip, but also detects when the continuous strip itself has a sudden change in thickness at a certain point. It is also effective in detecting foreign objects on the continuous strip, or when there is a lump on the continuous strip.

(Effects of the Invention) According to the present invention, as described above, since the difference in thickness at two adjacent points of the continuous strip is detected, the difference in plate thickness can be detected regardless of the inherent thickness of the continuous strip. This makes it possible to easily and reliably determine changes in thickness at seams, etc. even for materials with different thicknesses. Furthermore, the method of the present invention has the remarkable effect that it can be detected effectively using a detection device with a simple configuration.

As mentioned above, various explanations have been given of the present invention by giving preferred examples, but the present invention is not limited to these examples.
Of course, many modifications can be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the device for detecting thickness change of a strip-like continuous body according to the present invention, FIG. 2 is an explanatory diagram showing its operation, and FIG. 3 is an explanatory diagram showing a conventional thickness change detecting device. It is. 1... Band-shaped continuous body, 2... Movable roller, 3...
Adjustment screw, 4... Swinging roller, 5... L-shaped arm, 6... Fulcrum, 7... Fixed switch,
8... Spring, 9... Seam, 10...
Object to be detected, 11... Seam, 12a... First swinging roller, 12b... Second swinging roller, 14
a... first fixed roller, 14b... second fixed roller, 16... first arm, 18... fulcrum,
20... Coil spring, 22... Contact piece, 24... Second arm, 26... Fulcrum, 28...
··switch.

Claims (1)

[Claims] 1. In a continuous strip thickness change detection device that detects a change in thickness of a continuous strip, a first fixed roller and a second fixed roller that come into contact with one surface of the continuous strip, which is an object to be detected, are separated by a predetermined interval. The first swing roller and the second swing roller are fixed to each other and are positioned opposite to each of the first fixed roller and the second fixed roller with the strip-shaped continuous body in between, so that the first swing roller and the second swing roller can swing freely as appropriate members. The first swing roller and the second swing roller are respectively supported pivotably on L-shaped first and second arms, and when the first swing roller and the second swing roller swing due to a change in the thickness of the strip continuous body, the first swing roller and the second swing roller swing. A biasing means for pivotally supporting the first arm and the second arm so that the arms and the second arm both swing in the same direction, and returning the first arm and the second arm from the swinging position to a predetermined position. The first arm is formed when the thickness changing portion of the continuous strip passes between either the first fixed roller and the first swinging roller or between the second fixed roller and the second swinging roller. 1. A device for detecting thickness change in a strip-like continuous body, characterized in that the device includes a detection means for detecting a change in the distance between the second arm and the second arm.