JPS58173409A - Measuring method of length for belt-like object - Google Patents

Abstract

PURPOSE:To enable the measurement of length with high accuracy and at a high speed by using an optical measurng means which intersects with belts for conveying a measuring object such as a tire tread or the like at a prescribed angle, a high speed line sensor camera moving to the prescribed offset position, etc. CONSTITUTION:The arrival of the bottom edge in the forward end part of tire tread T at the prescribed position is measured with a parallel light projector 3 of which the angle of intersection 2 of the optical path with belts 2a, 2b for conveying the tire tread T is smaller than the angle beta of inclination in the forward end of the tread T and a high speed line sensor camera 4a. A high speed line sensor camera 6 is set at the offset position which is determined by the kind of the tread T on a basis of said position and is shorter by a prescribed length than the length of the tread T. The operation by the sum of the length value measured with the camera 6 and the offset value is accomplished with an arithmetic operation control means 19, and the length of the belt-like object such as the tire tread is measured in accordance with the measured value of the prescribed short length at a high speed with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an apparatus for measuring the length of a belt-like object, such as a tire tread, whose cross-sectional shape is a parallelogram.

Conventionally, a device that continuously measures the length of a tire tread that is cut to a fixed length on the conveyor line of an extrusion device during the tire manufacturing process has traditionally placed a measuring device directly between the front and rear ends of the tire tread. It was measured either by measuring the amount of light that matched the object, or by using a measuring means that measured by photoelectric conversion by shining light on it.

This tire tread is wrapped around the tire carcass on the forming drum of the forming machine and joined in an endless manner.If there is an error in the length of the tread, whether long or short, with respect to the outer circumference of the tire carcass, the tire carcass To avoid excess or deficiency in the joining part of the tread wrapped on top,
If the tread that has been wrapped is peeled off locally and is too long, it will become slightly sagging, and if it is too short, it will become slightly 91.
f The tape was wound slightly over the middle to ensure that the slanted surfaces of the joints matched correctly.

Therefore, there is a problem in that uneven tread weight distribution occurs near the joint.

Ride comfort has been strictly pursued in modern cars, and tire quality is an important factor in ride comfort, so the above-mentioned disparity in tread weight distribution affects the balance and uniformity of product tires. Since aPI has a considerable negative impact, strict control of tread length is strongly required.

By the way, in the conventional method of measuring the length between the leading edge and the trailing edge of the tread on the conveyor, the total length of 1111-j is 1111-j. Since the dimension value is measured as long as the projected length, and the dimension of the slope changes depending on the thickness of the tread, there is an inconvenience that the standard value needs to be tediously corrected for each extruded product, and the tread thickness itself may change during the process. In addition to fluctuations, the shape and dimensions of the inclined surface often become unstable due to the sharpness of the cutting blade and other causes. It has various problems,
The reality is that improvement measures are desired.

The present invention deals with this fact, and in particular, it is possible to accurately and easily measure the length of the longitudinal side of a strip whose vertical cross section in the longitudinal direction is a parallelogram while being transported by a transport means such as a conveyor. The important objective is to make it possible to measure the length of the belt, and in particular, the 1fiA part of the running center of the belt, which is the part on which the belt is mounted, has a structure that allows light to pass through. A conveyance means that is parallel to the running direction of the belt and conveys the belt while maintaining a forward tilted state, and a light beam crosses the running center line portion at a crossing angle smaller than the angle formed between the inclined surface portion of the belt-shaped body and the belt surface. A first measuring means consisting of a floodlight and a high-speed light/sensor camera installed at predetermined positions above and below the belt tracker is placed behind the first measuring means by an offset value that is slightly shorter than the standard length of the strip. A second camera consisting of a floodlight and an 85-inch in-sensor camera installed at predetermined positions above and below the belt and sandwiching the belt.
The measuring means, the first measuring means detects the lower edge of the inclined surface portion of the strip and receives a signal emitted, and at the same time the second measuring means is actuated to detect the strip that exists within the range imaged by the high-speed line sensor camera. By having the body length measured and adding this measured value and the offset value,
The device is composed of an arithmetic control means for calculating the length of the strip, and as soon as the first measurement stage detects the lower end edge sound of the front end inclined surface, the second measurement means moves to the rear of the part corresponding to the offset value. As a result of accurately measuring the length of the existing portion at the lower edge 1 of the rear end inclined surface portion, it has become possible to measure the length of the side portion of the belt-shaped body that is in contact with the belt surface.

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. (1) is a pair of left and right conveyor belts (2a), (2b) running in parallel and interlocking belt conveyors as conveyance means.
) is stretched endlessly between the front roller belt and the rear roller belt, but the running center line portion where both belts (2aJ, (2b) are close to each other) is kept at an appropriate distance (G) to create a space. form part.

It is designed to allow light to pass through it.

A belt-shaped object as a length measurement target is mounted so as to span the entire running center line portion, that is, the space, and its long plane direction is parallel to the belt running direction, and the belt-shaped object is moved in the direction indicated by the white arrow. (2b) (2b1 causes band (T)?] l-transportation.

The illustrated example of the band (T) f1 is a tire tread in which the shape of the vertical cross section parallel to the side surfaces extending in the elongated direction is a parallelogram shape with the front end surface and the rear end surface being inclined surfaces, and the front end inclined surface portion. The belts (2a) and (2b) are mounted on the belts (2a) and (2b) with the upper edges of the belts tilted forward in front of the lower edges.

(31 A parallel beam projector placed between the forward side heald and the backward side heald of the Hubbert conveyor (1), arranged so that the parallel beams are projected diagonally forward and upward, passing through the space and reaching upward. ing.

(4) is a high-speed line sensor camera that uses a Fort diode array as an element, and the light receiving part equipped with a Nitroen lens (4a) is directed toward the above-mentioned light emitter (3).
It is arranged at a predetermined position above II.

This parallel beam projector (3) and high-speed line sensor camera (
4) forms the first measurement means, but in this case, the intersection angle (field) between the parallel light beam projected from the projector (3) and the surface of the conveyor belt (2a) and the surface of the conveyor belt (2b) is As shown in Fig. 2, it is important to set the slope of the tire tread to an appropriate value so that it is smaller than the angle (b) with respect to the belt surface, and then move forward and press the projector ( When the parallel light i emitted in step 3) is to be blocked, the lower edge of the front end inclined surface section is the first to block the light.

(5) is a floodlight source, such as a high-frequency drive warning light, placed between the forward and backward belts of the conveyor (1); (6)
Conveyor without photodiode array elements (1)
A high-speed line sensor camera is placed above the camera (6), and the camera (6) and the projecting light source (5) form a second measuring means.

The above-mentioned second measuring means is arranged to raise and lower the tire tread (2a) with the tire tread (a tire tread spaced further back than the first measuring means by an offset value set to a slightly shorter length than the standard length in degrees Celsius) (2a). is provided at a predetermined position.

The camera (6) was fixed across the sliding piece (9 fathom 1 (9b)) fitted to the guide rod (8a), (sb) connecting the left and right frames (7~, (]b). It is attached to the mounting bracket Oe.

10,000 sliding pieces (9ri) have female threads that are screwed together with the screw shaft 0υ, and the left end of the screw shaft Qll is attached to the frame (]b).
The right end is rotatably supported on the frame (a).
The drive motor (121) attached to the rotating shaft is coupled to the drive motor (121).

Therefore, the sliding piece (9 fathoms) is rotated by the drive motor (12+).

(9b) slides integrally with respect to the guide rods (8a) and (Bb), and the camera (6) moves together with the guide rods (8a) and (Bb).

The above-mentioned series of mechanisms is formed as a position adjustment mechanism for moving the second measuring means toward and away from the first measuring means in the longitudinal direction of the belts (2a) and (2b).

03 is a length measuring device with a rack passed between the frames (T → and (TSU b)), Q41 is a length measuring device attached to the sliding piece (9 →)
It is an index that slides on 1, and this index 0 phrase and the camera (
The positional relationship with 6) has the following specified conditions.

That is, the reference line of the index Oa, for example, the corner line at the right end, is located at the front end (right end in FIG. 1) of the field of view when the camera (6) images the top surface of the belt (2→, (2b)). The index 04 and the camera (6) are positioned so that they are aligned vertically upward.

(+51 is the floodlight installed below the conveyor (1), 0
6) is a photoelectric switch which is also installed on the upper side and receives the light emitted from the projector o51, and which detects the tire tread (T) faster than the first measuring means detects the lower edge of the front end inclined surface of the tire trend (T) ), when the light emission of the light projector Q51 is interrupted, a signal for operation is sent to the arithmetic and control means o9.

The arithmetic control means 09 is a control system that gives a measurement operation command to the second measurement means upon receiving a signal from the photoelectric switch (161) and the camera + 41 of the first measurement means, and its function will be explained in the explanation of the operation described later. revealed by.

Next, the measurement operation of the length measuring device configured as described above will be explained.

The trend (T), which is extruded into a predetermined cross-sectional shape by an extruder (not shown) and cut into a fixed length on the conveyor line, enters the conveyor (1) and is loaded. By driving the tread (T) to be extruded, the offset value is set to a position that matches the offset value determined through a series of rigorous experiments depending on the type of tread (T) to be extruded.

On the other hand, this offset value is also written and stored in the arithmetic processing unit of the arithmetic control means (19).

Conveyor (tread on 17 (front end of force is 5 aS)
When the projection of light is interrupted, the photoelectric switch is activated and sends a pulse with an extremely short period to the camera (6) of the second measuring means to repeatedly measure the length iM of the tread (er) in the viewing eaves.

When the first measuring means detects the lower edge of the inclined surface portion of the tread (T) with the camera (4) and issues a signal, the value measured by the sensor camera (6) between the screens is sent to the arithmetic control means 0. It is sent to the arithmetic processor, summed with the offset value that has already been input, and the result is output from the arithmetic control means (191).

At this point, the measuring operation in the second measuring means is stopped and is left on standby until the arrival of the next tread (T).

The summed value output in this way is calculated using parallel beam projector (3
) and the belt (2a), (2b)
From the intersection with the plane of the camera (61 belt (2a),
(2b) Since it is the sum of the distance to the front edge of the field of view of the plane K"f, that is, the offset value, and the length of the tread (°C) imaged by the camera (6), it is natural that the trend (T)
11: Accurately matches the longitudinal dimension of the surface in contact with the belts (2a) and (2b).

As described above, the length measuring device of the present invention is provided with a high-resolution high-speed line sensor camera in close proximity to a relatively long strip (T), and a predetermined length of the strip (T) rather than the entire length of the strip (T). Since the partial unit length measurement is performed excluding the offset value of , the measurement can be performed with high accuracy.

Moreover, since the intersection angle of the parallel light beam with respect to the belt in the first measuring means is made smaller than the angle formed between the belt surface and the front end inclined surface of the belt-shaped body (η), the first measuring means has a parallelogram-shaped belt It becomes possible to reliably capture the base end 1 of the body (T), and as a result, the longitudinal dimension of the base of the strip-shaped body (Tl) can be measured with high precision.

Therefore, it becomes possible to strictly control the inner circumference length when the endless strip (T) is joined in the next process, which greatly contributes to stabilizing the balance and uniformity of the product in the case of tire manufacturing. In addition, by improving the mechanical accuracy of the extruder 1 conveyor line and tread cutting machine, and feeding back the highly accurate tread length measurement value, the dimensional accuracy of the tread length is further improved, and the dimensional accuracy of the tread length is further improved. This has the advantage of making it possible to automate the work of wrapping tread around tire carcass.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of the length measuring device of the present invention, and FIG. 2 is a schematic front view showing the arrangement of the first measuring means in FIG. 1. (1)... Conveying means, (2a), (2b)...
·belt. (3)...Parallel beam projector. (4)...High-speed line sensor camera. (5)...Floodlight, (6)...High speed line sensor camera. 09... Arithmetic control means, (T)... Band-shaped body.

Claims (1)

[Scope of Claims] l The traveling centerline portion of the spreading belt, which is the portion on which the strip-like object to be measured is mounted, has a structure that allows light to pass therethrough, and has a cross section parallel to the side edges extending in the longitudinal direction. The belt-like body having a parallelogram shape has its longitudinal side parallel to the running direction of the belt, and is conveyed while maintaining a forward-inclined state such that the upper edge of the inclined surface at the front end is ahead of the lower edge. a parallel beam projector and a high-speed line sensor camera including a photodiode array as an element, and the light beam from the parallel beam projector is set at an angle (less than β) between the inclined surface portion of the strip and the belt surface. A first measuring means is provided at a predetermined upper and lower position between the belt so as to cross the running center line portion at the intersection angle (ψ), and detects the lower end edge of the inclined surface part by full photoelectric conversion; A high-speed line sensor camera including a floodlight and a photodiode array Ie, which are spaced behind the first measuring means by an offset value that is slightly shorter than the above, and are provided at predetermined positions above and below the belt tracker 231st measuring means, the first measuring means detects the lower end edge of the inclined surface portion of the band-shaped body and at the same time receives the emitted signal, activates the second measuring means; 1. A belt-shaped body comprising: arithmetic control means for calculating the length of the belt-shaped body by measuring the length of the existing belt-shaped body and adding the measured value and the offset value. A length measuring device. 2. Claims in which the second measuring means is installed in a position adjustment mechanism that can approach and separate from the first measuring means in the longitudinal direction of the belt, and the offset value can be changed as appropriate. 2. The device for measuring the length of a strip-shaped body according to item 1.