JPH02179732A - Center line drawing device of beltlike tire member - Google Patents

Abstract

PURPOSE:To make a marking pen follow precisely, by a method wherein after detection of a quantity of deviation of the center line of a beltlike tire member, when a detecting position on the beltlike tire member arrives at a marking pen, the marking pen is displaced according to the quantity of the deviation and the center line is drawn on the beltlike tire member. CONSTITUTION:Signals corresponding to widths W1, W2 of a tire member covering visual field of cameras 2a, 2b are applied to a camera controller 6, a quantity of deviation of the center line of the tire member 1 is calculated, direct current voltage corresponding to the quantity of deviation (W1-W2)/2 is applied to a shift registor 7. A pulse transmitter 8 sending a pulse every movement of the tire member 1 at a short fixed distanced is connected with an input end of the shift registor 7. Every time when the pulse is applied to the shift registor 7 through the pulse transmitter 8, the shift registor 7 sends the quantity of deviation to be applied to the same through the controller 6 in regular order once by once and the quantity of deviation applied to the same at the last time is applied toward a comparator 9 and motor amplifier 10. Then when a number of transmitted pulses arrive at the number of pulses corresponding to a distance among the cameras 2a, 2b and marking pen 3, the marking pen 3 is displaced by corresponding to the measured quantity of deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a device for drawing a center line on a band-shaped tire member such as a rubberized carcass cord, ply cord, belt, or tread of an automobile tire. .

(Prior art) As a device for drawing a center line on a belt-shaped tire member, while feeding the belt-shaped tire member at a constant speed in its length direction,
The time required for the tire member to continuously detect the deviation amount of the center line due to meandering and width fluctuations of the tire member, and for the tire member to move from this detection position to the position of the marking pen located on the advancing side. A device is used in which the marking pen is moved in accordance with the amount of deviation after a delay of 30 minutes.

(Problem to be solved by Isatsu) However, conventional center line drawing devices are based on the premise that the belt-shaped tire member is fed at a constant speed. Since only the delay processing was applied, the feed speed of the strip tire member was changed, the feed speed fluctuated, etc.
Furthermore, there is a problem in that the marking pen does not follow accurately when feeding is performed intermittently.

The present invention provides an apparatus for drawing the center line of a belt-shaped tire member that can accurately follow a marking pen regardless of changes in the feeding speed of the tire member, fluctuations, continuous feeding or intermittent feeding of the tire member.

(Means for Solving the Problem) While feeding a belt-shaped tire member in its length direction, detect the amount of deviation of the center line of the tire member due to meandering or width fluctuation of the tire member, and In the device for drawing a center line of a band-shaped tire member, the marking pen located on the advancing side of the tire member is displaced in the width direction according to the deviation amount, and a signal is output every time the band-shaped member moves a predetermined distance. a pulse transmitter, a shift register that sequentially outputs the detected deviation amount for each output of the pulse transmitter, and a DC motor for moving the marking pen according to the sequential output of the shift register; A motor amplifier is provided to rotate accordingly.

Note that it is preferable to provide a comparator for comparing the deviation amount before and after the shift register successively outputs two times, and setting the gain value of the motor amplifier according to the difference between the two deviation amounts.

The gain value can be set in several stages, for example, in three stages: large, medium, and small, depending on the magnitude of the difference between the deviation amounts.

(Function) After detecting the deviation amount of the center line of the band-shaped tire member, when the detection point (sampling point) on this band-shaped tire member reaches the marking pen, the marking pen is displaced according to the above-mentioned deviation amount, Draw a center line on the band-shaped tire member.

Note that if a comparator is provided, when the difference in deviation amount is large, the DC motor rotates at a relatively high speed according to the deviation amount, and when the difference in deviation amount is small, the DC motor rotates at a relatively low speed. The marking pen draws the center line more accurately by rotating according to the amount of deviation.

(Example) In the figure, a belt-shaped tire member 1 is placed on a conveyance line (not shown) running in a horizontal plane and sent in the direction of arrow a. Cameras 2a and 2b are provided with a large number of photoelectric elements arranged closely in the width direction above both side edges of the band-shaped tire member 1, and detect the position of the edge by light reflected from the edge of the tire member. installed, the tire member 1
A marking pen 3 located in front of the cameras 2a and 2b in the direction of movement is attached to a servo actuator 5 that moves forward and backward in the width direction by the drive of a DC motor 4.

Output ends of the cameras 2a and 2b are connected to a camera controller 6 for measuring and controlling the cameras 2a and 2b,
A signal corresponding to the width W and W2 of the tire member that covers the field of view of the cameras 2a and 2b is input to the camera controller 6, and the camera controller 6 detects the difference between the width W and W2, that is, the center line of the tire member 1. The deviation amount is calculated, and the DC voltage is calculated according to the deviation amount (W,, -W,)/2, for example, 0±IO according to the deviation amount of O±50 mm.
A DC voltage of V is output, and this output is sent to the shift register 7.
sent to.

The input end of this shift register 7 has the tire member 1
is the distance between the cameras 2a, 2b and the marking pen 3 (
For example, the output end of a pulse transmitter 8 that emits a pulse every time the user moves a predetermined distance (for example, 20 m, 40 mm, etc.) shorter than 500 m, ], OOO mm, etc. 8, each time a pulse is input to the shift register 7, the shift register 7 receives the deviation amount (W knee W2)/2 input from the camera controller 6.
is sequentially sent one time at a time, and the previously inputted deviation amount is outputted to the comparator 9 and the motor amplifier 1o.

Then, when the number of one transmitted pulse reaches the number corresponding to the distance between the cameras 2a, 2b and the marking pen 3, the camera 2a
, 2b, the marking pen 3 responds to the deviation amount measured by the marking pen 3.

The comparator 9 increases the responsiveness of the marking pen to enable tracking in a short time when the deviation amount is large, that is, when the meandering amount or width variation of the tire member 1 is large. Compares the difference between the input deviation amount and the previously input deviation amount with the set value to determine whether the difference in deviation amount is large, medium, or small, and when the difference in deviation amount is large. , medium, and small, the gain values of the motor amplifier 10 are set to large, medium, and small, respectively. Then, the motor amplifier 10 drives the DC motor 4 according to the deviation amount directly input from the shift register 7 and according to the gain value set by the comparator 9, and moves the marking pen 3 across the width via the turbo actuator 5. slide in the direction. Note that 11 is a position detection potentiometer that detects the amount of movement of the servo actuator 5 and feeds back the position signal to the motor amplifier 1o so that the actual amount of movement of the servo actuator 5 becomes equal to the commanded amount of movement. It is something.

In this embodiment, the DC motor 4 rotates the moving amount corresponding to the deviation amount of the center line of the belt-shaped tire member at a speed corresponding to the difference in the deviation amount, and marks via the servo actuator 5. Since the pen 3 is displaced in the width direction and the actual movement amount of the servo actuator 5 is fed back, the marking pen can smoothly and accurately follow the meandering and width fluctuations of the band-shaped tire member.

(Effects of the Invention) According to the present invention, instead of detecting the deviation amount of a '41F-shaped tire member that is fed forward in the length direction and displacing the marking pen after a set time, the band-shaped tire member is fed a predetermined distance. Since the marking pen is displaced after the marking pen is moved, the center line can be marked without any trouble not only when the feed speed of the strip tire member is constant, but also when the feed speed fluctuates or intermittent feed is performed. I can draw. According to the second aspect of the invention, since the moving speed of the marking pen is changed according to the magnitude of the tendency of increase or decrease in the deviation amount, even when the meandering amount or width variation of the belt-shaped tire member is large,
The center line can be drawn accurately and smoothly.

[Brief explanation of the drawing]

The drawings are block diagrams of embodiments of the present invention. 1: band-shaped tire member, 2a, 2b: camera for detecting width direction displacement of the side edge of band-shaped tire member 1, 3: marking pen, 4: DC motor, 5-servo actuator, 6:
Camera controller, 7: Shift register, 8: Pulse transmitter, 9: Comparator, 10: Motor amplifier, 11
: Potentiometer for position detection. Patent applicant: Toyo Rubber Industries Co., Ltd. Agent Patent attorney: Yoshi 1) Tsukasa Ryo

Claims (1)

[Scope of Claims] [1] Detecting the amount of deviation of the center line of the tire member due to meandering or width fluctuation of the tire member while feeding the belt-shaped tire member in its length direction; In the device for drawing the center line of a band-shaped tire member, the marking pen located on the advancing side of the tire member is displaced in the width direction according to the deviation amount, which outputs a signal every time the band-shaped tire member advances a predetermined distance. a shift register that sequentially outputs the detected deviation amount for each output of the pulse transmitter, and a DC motor for moving the marking pen in response to the sequential output of the shift register. 1. A center line drawing device for a belt-shaped tire member, comprising: a motor amplifier for rotating according to the rotation speed. [2] A comparator is provided for comparing the deviation amounts before and after the shift register successively outputs two times, and setting the gain value of the motor amplifier according to the difference between the two deviation amounts. A device for drawing the center line of a belt-shaped tire member.