JPS61243753A - Coil centering device - Google Patents

Abstract

PURPOSE:To shorten the light path of a light sensor without restricting the shape of a mandrel by locating two sets of the light sensors mounted on an arm on the extensions of the upper and lower end edges of the mandrel, lift and lower a coil to enter between a pair of arms. CONSTITUTION:After arms 13, 14 are set and while a coil 10 is vertically ascend ing, the light path of a first light sensor consisting of a light projecting section 20 and a light receiving section 22 crosses a bore 11a of a winding core 11. Here, a spot of the light projecting section 20 is incident on the light receiving section 22. When the detecting signal from the light receiving section 22 is sent to a control circuit 8, the ascending speed of coil is changed over to low speed. And while the coil 10 is ascending with low speed and the bore 11a enters the light path of a second ligth sensor consisting of a light projecting section23 and a light receiving section 21, the detecting signal is generated so that the height of the bore 11a is judged to coincide with that of a mandrel 23 to stop the operation. Next, after centering, the arms 13, 14 are retreated and in the movement of them the first light sensor is shaded by the coil 10 and a counter counts pulses in the shading to figure out the outer diameter of the coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coil centering device used when inserting an inner hole of a coil into a mandrel of an unwinding machine or the like.

``Webs such as plastic films, paper, cloth, etc., are wound into rolls after production. The web is wound into a roll and then transported to a processing line, then sent to an unwinding machine and pulled out according to the line speed. This unwinding machine is located at the entrance of the processing line, and the inner hole of the coil is inserted into the mandrel.

When transferring the coil to a rewinding machine, it is necessary to align the mandrel and the inner hole of the coil,
A coil centering device is used for this alignment. Various types of coil centering devices have been known for a long time, and one of them is JP-A-53-931.
There is one described in Publication No. 54. This coil centering device uses three sets of optical sensors consisting of a light emitting part and a light receiving part, and the three sets of optical sensors simultaneously detect the inner hole of the coil while the coil is lifted up on a coil trolley. , the coil stops rising when The three sets of optical sensors have light emitting parts fixed to the main body of the device holding the mandrel so that the spot light travels in the axial direction along the outer periphery of the mandrel, and are kept at an appropriate distance from the tip of the mandrel. A light-receiving section for receiving spot light is attached to the plate arranged as shown in FIG.

[Problem that the invention seeks to solve]

In the conventional coil centering device, the light emitting part of the optical sensor is placed near the base of the mandrel, and the light receiving part of the optical sensor is placed at a position away from the tip of the mandrel by at least the width of the coil. , the optical path of the optical sensor is at least the total length of the mandrel plus the coil width. Therefore, since the optical path of the optical sensor becomes quite long, it is necessary to mount the optical sensor accurately, and there is a problem that a highly accurate light projection optical system is required to suppress the spread of the spot light. . Furthermore, since the spot light is projected in the axial direction of the mandrel, there are restrictions on the shape of the mandrel, and for example, a mandrel with a flange cannot be used.

In addition, since the coil pull-out tension changes depending on the outer diameter of the coil, it is necessary to measure the outer diameter of the coil and input this into the tension control system of the unwinding machine. The measurement was performed using a measuring device, which made the operation cumbersome.

The present invention is not limited by the shape of the mandrel, and the optical path of the optical sensor can be shortened.
Moreover, it is an object of the present invention to provide a coil centering device that can also measure the outer diameter of a coil.

[Means for solving problems]

In order to solve the above problems, the present invention arranges a first arm and a second arm in front of a mandrel with a distance slightly wider than the width of the coil, and two sets of optical sensors are attached to these arms. Attach the two arms to the set position so that these two sets of optical sensors are located on the extension line of the upper and lower edges of the mandrel, and after this positioning, the coil is placed between the pair of arms. During this vertical movement, the two sets of optical sensors simultaneously detect the upper and lower edges of the coil inner hole. When the coil is rotated or linearly moved to retreat from both sides of the coil, the outer diameter of the coil is measured by checking the light-blocking section of one optical sensor.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

〔Example〕

In FIG. 1, a coil truck 1 is provided with wheels 2 at the bottom and moves horizontally in the direction of the arrow. A hydraulic device 3 is attached to the coil truck 1, and a coil support base 4 is fixed to a piston mouth/nod 3a of the hydraulic device 3, thereby forming a lifter.

The hydraulic device 3 is connected via a pipe 5.6 to a solenoid valve 7, which is switched by a signal from a control circuit 8, thereby actuating the hydraulic device 3 to close the coil support 4. move up and down.

The coil support base 4 is formed with a square-shaped notch 4a, into which the lower edge of the coil 10 is inserted and supported so as not to move. This coil 10 has a roll shape in which a web is wound around a sleeve-shaped winding core 1). In addition, when the web is a steel plate, it is directly wound without using the winding core 1), leaving an inner hole.

First arms 13 and 14 are integrally provided so as to sandwich the winding core 1), and the center of rotation thereof is fixed to the shaft 15a of the rotary encoder 15. This second arm 1
A piston loft 16a of a hydraulic device 16 is connected to a part of 4, and when the second arm 14 is pushed or pulled together by the solenoid valve 17, the first and second arms 13
．． 14 rotates together with the shaft 15a of the rotary encoder 15, and moves between a set position in which the coil 10 is sandwiched and a retracted position away from both sides of the coil 10. Note that reference numeral 18 indicates a shaft that rotatably supports the hydraulic device 16.

The first arm 13 is provided with a light projecting section 20 and a light receiving section 21, and the second arm 14 is provided with a light receiving section 22 and a light projecting section 2.
The light projecting section 20 and the light receiving section 22 constitute a first optical sensor, and the light projecting section 23 and the light receiving section 21 constitute a second optical sensor. When the first arm 13 and the second arm 14 are in the set position, the light projecting section 20 and the light receiving section 22 are located on a straight line extending horizontally from the upper edge of the mandrel 25, and the light projecting section 23 and the light receiving portion 21 are located substantially on a straight line extending the lower edge of the midrel 25.

Therefore, the spot light from the light projecting section 20 is transmitted to the light receiving section 22.
When the spot light from the light projecting section 23 is incident on the light receiving section 21, the inner hole 1)a of the winding core 1) and the midrel 25 are aligned in the height direction. Note that in order to facilitate discussion of the coil 10, the coil inner hole 1)a is made larger than the diameter of the mandrel 25.
) When the mandrel 25 and the mandrel 25 are arranged concentrically, the optical axes of the first and second optical sensors are located in the gap between them. In addition, since the notch 4a of the coil support base 4 restricts the lateral position of the coil IO, the lateral position of the winding core 1) and the mandrel 25 is as follows.
It has been right from the beginning.

A hydraulic device 28 that expands and contracts with a solenoid valve 27 is connected to the coil truck 1, and when the hydraulic device 28 is activated by a signal from the control circuit 8, it moves horizontally in the direction of the arrow. That is, after centering, the hydraulic device 28 is operated to horizontally move the coil truck 1 to the right in FIG. 1, and the winding core 1) is fitted into the mandrel 25 during this horizontal movement. After this fitting, the coil support base 4 returns to the lowered position, and then the hydraulic device 28 is activated to draw the coil truck 1 to the position shown in FIG.

The unwinding device 31 rotatably holds the mandrel 25, unwinds the attached coil 10, and supplies it to a processing line (not shown). A proximity switch 32 such as a photo sensor is attached to the upper end of this rewinding device 31, detects the set position of the coil 10, sends a signal to the control circuit 8, and stops the horizontal movement of the coil truck 1.

Further, the proximity switch 32 is fixed to an arm 33, and this arm 33 is moved in the direction of the arrow by a position adjustment device 34. This position adjustment device 34 is composed of, for example, a motor, a feed screw shaft rotated by the motor, and a nut screwed onto the feed screw shaft and fixed to the arm 33, and adjusts the cap position of the coil 10. to regulate.

FIG. 2 shows the rotating state of the arm.

The state shown by the solid line is the set position, and the state shown by the two-dot chain line is the retracted position. When the arm rotates from the set position to the retracted position along the circular trajectory 36, the light receiving section 22 of the first optical sensor passes through the side surface of the coil 10. Since the spot light from the light projecting section 20 is blocked by the coil 10 when passing through the side surface of the coil 10, the light receiving section 22 enters a light blocking state. This light shielding state is the coil 10
Since there is a correlation with the outer diameter of the coil, the outer diameter of the coil can be determined from the angle θ of the light shielding section. The angle θ of this light-blocking section can be measured by counting the number of pulses output from the rotary encoder 15 while the light-receiving section 22 is in the light-blocking state.

FIG. 3 shows a circuit for measuring the outer diameter of the coil. The counter 37 counts the pulses output from the rotary encoder 15 when the light receiving section 22 of the first photosensor is in a light-blocking state to determine the angle θ of the light-blocking section. The angle/outer diameter conversion table 38 is a table showing the relationship between a predetermined angle and the outer diameter of the coil, and the outer diameter of the coil is read from the contents of the counter 37. The coil outer diameter output from this angle/outer diameter conversion table 38 is D'/
After being converted into an analog signal by the A converter 39, it is input to a well-known tension control system 40 built in the rewinding machine 31,
The web pull-out tension is controlled according to the outer diameter of the coil. The part surrounded by the dotted line is a coil outer diameter calculating section 8a, which constitutes a part of the control circuit 8 shown in FIG.

Next, the operation of the above embodiment will be explained with reference to FIGS. 4 and 5. First, the coil 10 is placed on the coil support base 4 which has been lowered to the lower limit position. This coil 10
is held horizontally with its lateral position regulated by the ■-shaped notch 4a. Next, the control circuit 8 sends a signal to the solenoid valve 17 to switch the valve and supply the hydraulic fluid to the hydraulic system 1.
Supply to 6. As a result, the hydraulic device 16 pushes out the piston rod 16a, and the first and second arms 13.
14 and move it to the set position shown by the solid line in FIG.

After setting the first and second arms 13, 14, the control circuit 8 sends a signal to the solenoid valve 7 to switch it and raise the piston rod 3a of the hydraulic device 3, as shown in FIG. Lift the coil 10 vertically. This coil 10
While the winding core 1) is rising, the inner hole 1) a of the winding core 1) crosses the optical path of the first optical sensor consisting of the light projecting section 20 and the light receiving section 22. As a result, the spot light projected from the light projecting section 20 is transmitted to the light receiving section 2.
2, and a detection signal is sent from the light receiving section 22 to the control circuit 8. When the control circuit 8 receives the detection signal from the first optical sensor, it switches the rising speed of the hydraulic device 3 to a low speed and slowly lifts the coil 10.

While the coil 10 is rising at a low speed, the light projecting section 23
When the inner hole 1) a of the winding core 1) enters the optical path of the second optical sensor consisting of the and the light receiving section 21, a detection signal is generated from the second optical sensor. As a result, the control circuit 8 controls the first
and the detection signal from the second optical sensor at the same time, it is determined that the inner hole 1) a of the winding core 1) and the mandrel 25 are aligned in the height direction, and the solenoid valve 7 is switched. The operation of the hydraulic device 3 is stopped.

After the centering is completed, the control circuit 8 operates the hydraulic device 16 to adjust the first and second positions as shown in FIG.
Move arms 13, 14 to the retracted position. When these arms 13, 14 move to the retracted position, the first light sensor is shielded from light by the coil 10. While this first optical sensor is shielded from light, a counter 37 counts the pulses output from the rotary encoder 15, and sends the contents to an angle/outer diameter conversion table 38 to calculate the outer diameter of the coil.

The obtained coil outer diameter is converted into an analog signal by the D/A converter 39 and then input to the tension control system 40 of the rewinding machine 31.

After the arms 13, 14 are retracted, the hydraulic system 28 is operated to horizontally move the coil truck 1 to the right in FIG. When the coil truck 1 moves, the inner hole 1) a of the winding core 1) of the coil 10 placed on the coil support base 4 fits into the mandrel 25, as shown in FIG. When the coil 10 is inserted into the mandrel 25 to a predetermined position, the proximity switch 32 detects the side surface of the coil 10 and is turned on. This proximity switch 32 is
If N, the control circuit 8 stops the operation of the hydraulic device 28,
Instead, the hydraulic device 3 is operated to lower the coil support base 4 as shown by the two-dot chain line in FIG. After the coil support base 4 returns to the predetermined lower limit position, the hydraulic system 28 is activated again to horizontally draw the coil truck 1 to the position shown in FIG.

After loading the coil 10 into the unwinding machine 31, the built-in motor rotates and rewinds the web with a predetermined tension according to the outer diameter of the coil input to the tension control system 40, and transfers it to the processing line. continuously supplied.

〔Effect of the invention〕

The present invention having the above configuration has two sets of optical sensors that detect approximately the upper edge and the lower edge of the inner hole of the coil, respectively, attached to a pair of arms movably provided so as to sandwich both sides of the coil. The optical path of the optical sensor can be made considerably shorter than that of the previous device. In this way, shortening the optical path of the optical sensor reduces the blurring and spread of the spot light, which has the advantage of simplifying the structure and installation of the optical sensor. Furthermore, unlike conventional methods, the optical sensor is not arranged along the mandrel, so there is no restriction due to the shape of the mandrel.

Furthermore, when moving the optical sensor from the set position to the retracted position, the optical sensor measures the area where light is blocked according to the outer diameter of the coil and calculates the outer diameter of the coil, which requires a special measuring device. You can easily measure the outer diameter of the coil without using it.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention. FIG. 2 is a side view of the main parts of the present invention, showing the set position and the retracted position of the arm. FIG. 3 is a block diagram showing the configuration of the coil outer diameter measuring circuit. FIG. 4 is an explanatory diagram showing a state in which the coil is raised. 5 is an explanatory view showing the state in which the coil is mounted on the mandrel. 1...Coil truck 3...Hydraulic device 4...Coil support stand lO...Coil 1)...Winding core 1)
a..Inner hole 13.14..Arm 15..Rotary encoder 16..Hydraulic system 20.23..Light emitter 21.22..Light receiving section 25..Mandrel 28..Hydraulic system 31..Rewind Machine 32...Proximity switch 38...Angle/outer diameter conversion table 40...Tension control system. Procedural amendment December 4, 1985

Claims (4)

[Claims] (1) When two sets of optical sensors consisting of a light emitting part and a light receiving part are used, and these first and second optical sensors simultaneously detect the upper edge side and the lower edge side of the coil inner hole that is being raised and lowered in a horizontal state, , in a coil centering device that aligns the coil inner hole and the mandrel by stopping the raising and lowering of the coil; A first arm and a second arm each holding either a light emitting part or a light receiving part of an optical sensor, and the first arm and the second arm are simultaneously moved to create a first optical sensor and a second optical sensor. Arm driving means for positioning the coils at a set position where the coils and the coils substantially coincide with horizontal extensions of the upper and lower edges of the mandrel, and at a retracted position where the coils do not collide when moving laterally toward the mandrel. and means for measuring the outer diameter of the coil from the size of the section where the first optical sensor is shielded from light by the coil when the first arm and the second arm move from the set position to the retracted position. A coil centering device featuring: (2) The coil centering device according to claim 1, wherein the first arm and the second arm are integrally provided. (3) The coil centering device according to claim 2, wherein the first arm and the second arm are rotatably provided. (4) The coil outer diameter measuring means includes a rotary encoder that is attached to the center of rotation of the first arm and the second arm and detects the rotation angle of the first arm and the second arm, and a rotary encoder that detects the rotation angle of the first arm and the second arm. The coil centering device according to claim 3, comprising a counter that counts output pulses, and an angle/outer diameter conversion table that stores the relationship between the contents of this counter and the outer diameter of the coil. .