JPS597205A - Measuring device of endless annular object - Google Patents

Abstract

PURPOSE:To enable easy measurement with high accuracy by measuring the rotating quantity of a sample rotating means corresponding to one turn of a sample installed in the home position of the rotating position and displaying the same as the inside or outside diameter of the sample or the value corresponding to the same. CONSTITUTION:A discrimination mark 8 is coated at an arbitrary point of an endless sample 7 and the sample is put on a measuring roll 6. When a motor 4 is driven, the sample 7 on the roll 6 starts rotating as well. The rotating quantity of the roll 6 since the point of the time when the rotation starts is inputted as a pulse train with an encoder 20 to a pulse counting interface 21. The pulse trains until the mark 8 that detects a mark sensor 10 makes one turn are counted with the interface 21 and are integrated as the pulses for the inside circumferential length of the sample. The integrated data for certain times are respectively operated and stored, then the average value thereof is calculated, the result whereof is displayed with a digital display interface 23 on a digital display part 24. The final value of the inside diameter of the sample is thus known.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the inner diameter, outer diameter, or the corresponding length of an endless object, particularly a rigid object such as a metal, or a non-rigid object such as an elastic or flexible object. This invention relates to a device that accurately measures the inner and outer diameters or inner and outer circumferential lengths of O-rings.

Conventional methods for measuring the length of such endless ring-shaped rigid/non-rigid samples, especially the inner and outer diameters, can be roughly divided into two types: mechanical contact measurement method and optical non-contact measurement method. Are known.

Among these, in the mechanical contact measurement method, calipers and gauges are generally used, but it is difficult to accurately measure the inner diameter or outer diameter of a sample that is not a perfect circle, and moreover, it is difficult to accurately measure the inner diameter or outer diameter of a sample that is not a perfect circle. If this happens, the influence of the measurer will intervene and the ring shape of the sample will change, making it difficult to expect accurate measurements.

The method used in optical non-contact measurement methods, for example, which uses an optical device such as a projector to measure the inner diameter or outer diameter without contacting the sample itself, If it can be maintained, it can be said to be the most reliable measurement method. However, samples that can maintain a perfect circle or a nearly perfect circle are limited to those with a large wire diameter (thickness) or small inner diameter, which greatly limits the measurement range. Even if the sample is a perfect circle, when measuring with an optical instrument such as a tool microscope,
There is a problem with the method of setting the sample. In other words, it is not always easy to set the sample so that the measurement axis passes through the center of the circle, and the difficulty in locating the center increases significantly when the inner diameter of the sample becomes so large that it cannot fit within the field of view of the measurer. do. Even in this case, there are individual differences between the measurers.

For this reason, in both mechanical and optical measurement methods, the inner and outer diameters of the inner and outer diameters are measured at two locations while holding the sample in a state that is considered to be almost a perfect circle, and then the average value of these is calculated as the final value. Currently, it is calculated as the value of the inner diameter and outer diameter. However, as the inner and outer diameters of the sample become larger, it becomes more difficult to maintain the sample in a state that is considered to be a perfect circle, and measurement errors also increase.

Furthermore, even when using a conical gauge as one of the mechanical measurement methods mentioned above, it is actually not easy to keep the sample in a circular shape without elongating it and follow the scale of the inner diameter dimension.
Furthermore, it is difficult to enlarge and read the scale.

In view of the various problems mentioned above, the present inventors proposed in Japanese Patent Application No. 57-5409 an apparatus for applying measurement pressure to a sample and performing measurements using the IJ near scale method.

In the same application, a sample hung on a measuring roller is raised by a moving piece, and the inner and outer diameters and wall thickness of the sample are calculated by opening the amount of movement, but this is not suitable for measuring samples with large inner diameters. This inevitably means that the equipment has to be larger. In addition, with this device, when the rising speed of the moving piece is increased in order to shorten the measurement time for large-diameter samples, not only static measurement weight but also dynamic acceleration affects the contact between the sample and the probe. . As a result, there is a possibility that the measured pressure, which should be kept constant, may change due to the reaction caused by the increase in speed. Therefore, it is necessary to maintain the rising speed of the moving piece at a constant speed that is not affected by acceleration. The time it takes to return to the reference position is wasted. On the other hand, since the temperature of the measurement environment is greatly related to the physical properties of the sample, the optimum measurement pressure varies depending on the dimensions and material of the sample, and its management is time-consuming.

Therefore, one object of the present invention is to eliminate the above-mentioned inconveniences and inconveniences in measuring the inner and outer diameters and inner and outer circumferential lengths of an endless ring-shaped object by the above-mentioned conventional method and the previously proposed method by the present applicant, and to simplify the method. Another object of the present invention is to provide a measuring device for an endless ring-shaped sample in which these measurements can be easily carried out using a small-sized device and the measured values can be displayed clearly at a glance.

Another object of this invention is that the wire diameter of the endless ring-shaped sample is 1
It is an object of the present invention to provide a measuring device that can measure the inner and outer diameters with extremely high precision without causing expansion or contraction of the inner diameter due to measurement pressure, even if the wall thickness is as small as the diameter of the mortar or less.

In order to achieve the above-mentioned objectives, the measuring device according to the present invention is characterized in that the measurement of the inner diameter or outer diameter of the endless ring-shaped sample as the object to be measured is performed in the following steps. do.

That is, first, this sample is mounted at a fixed position on the sample rotation means. This rotating means is rotationally driven by a driving means,
As the rotating means rotates, the sample also rotates. Then, the rotation amount of the rotation means corresponding to one revolution of the sample is measured by the rotation amount measuring means, and the measurement result is the inner diameter of the sample,
The display means displays the outer diameter or a value corresponding thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in which the inner diameter of an endless ring-shaped sample is measured will be described below with reference to the drawings.

FIGS. 1 and 2 are schematic explanatory diagrams of the main body portion of the measuring device according to the present invention. In FIG. 1, a base 1 and a stand plate 2 standing upright from one end of this base 1 provide
A frame of the main body of the apparatus is formed, and a motor 4 is installed on this base 1 via a motor mounting plate 6. A rotating shaft 5 of this motor 4 passes through a through hole in the stand plate 2 and projects horizontally, and a measuring row 26 that rotates as the rotating shaft 5 rotates is attached to the tip thereof.

In the illustrated embodiment, an object to be measured (hereinafter referred to as a sample) 7 is suspended on a measuring roller 6, and as the measuring roller 6 rotates, the sample 7 also rotates along its inner circumference. , the inner circumferential length of the sample will be measured. At this time, the rotation of the measuring roller 6 is faithfully transmitted to rotation amount measuring means, which will be described later. An identification mark 8 is placed in advance at one point on the outer circumference of the sample 7. An appropriate type of identification mark can be selected depending on the type of sample.

For example, if the sample is a non-magnetic material, the identification mark is coated with paint containing a magnetic material, if the sample is a non-reflective material, an optically reflective thin film is applied, and if the sample is a highly reflective material, a low reflective thin film is applied. Above the measuring roller 6, there is a stand plate 2.
A mark sensor 10 is mounted via a sensor mounting plate 9 fixed to the side surface of the mark sensor 10. The head of this mark sensor 10 is located above the suspended sample so as to detect the identification mark 8 of the sample 7, and detects the start and end points of each rotation of the sample as it rotates with the rotation of the measuring roller. It looks like this. The mark sensor 10 is selected to be compatible with the above-mentioned types of identification mark 8, but in this embodiment, a reflective type projector/receiver is used, and the optical identification mark 8 is attached to the mark sensor 10. The device is configured to detect locations where

On the other hand, below the measuring roller 6, a guide pin mounting rod 11 is fixed at one end to the stand plate 2 so as to extend parallel to the rotating shaft 5, and a guide pin mounting member 12 is attached to this mounting rod 11. has been done. A pair of needle-shaped guide bottles 13.
13 protrudes from the mounting member 12 in a direction perpendicular to the mounting rod 11 and in a horizontal direction, and is fixed to the mounting member. These pair of guide pins 13, 13 position the hanging both sides of the sample suspended on the measuring roller 6 between these pins, so that the rotation path of the sample is not disturbed, and This prevents wobbling of the rotating surface. For this reason, it is preferable that the distance between the pair of guide bins 13.13 can be adjusted to a width corresponding to the thickness of the sample. Reference numeral 14 is a screw for fixing the mounting member 12 to the mounting rod 11.

Depending on the material and dimensions of the sample, in order to prevent the sample's rotating surface from wobbling in the rotational axis direction, a separate guide bottle or roller such as a pulley (not shown) may be installed perpendicular to the sample's rotating surface. ) may be provided. In addition, although not shown in the drawings for simplicity of explanation, in order to prevent rotational slip between the sample 7 and the measuring roller 6, and to allow the sample to rotate stably within the rotational plane of the measuring roller, Original M<
It is also possible to provide a guide roller with moving means at a suitable position and to rotate this guide roller in synchronization with the rotation of the measuring roller. Furthermore, III constant roller 6
Of course, it is also possible to prevent rotational slip in the direction of movement of sample #1 by placing a presser roller in contact with the upper surface of the sample at an appropriate position on the upper side of the sample, if necessary.

A modification of the above measurement date -26 is shown in FIG. A flange 15 is provided concentrically on one side edge of the measuring roller 6, and a width determining washer 16 is fitted via a screw 17 on the opposite side edge. and,
A sample is mounted between these seven flanges 15 and washers 16, so that the rotation path of the sample can be determined by the measuring roller itself. Therefore, such a measuring roller with flanges and washers and the aforementioned guide bin 13°1
If used in combination with 6, it can be expected to further prevent wobbling of the rotating surface of the sample and wobbling in the direction of the rotating axis. In the illustrated embodiment, 1, the sample 7 has a flat belt mounted between the flange 15 and the washer 16, and the position of the washer 16 can be adjusted appropriately according to the width of the sample 70 by adjusting the screw 17. Can be set to These measuring rollers 6 and additional means of guide pin 1i13 and presser roller constitute the rotation means of the device.

FIG. 4 is a block diagram showing an example of the control system of the measuring device according to the present invention. The amount of rotation of the measuring roller 6 is detected by a rotation amount measuring means via a driving means including a motor 4. In this embodiment, the amount of rotation of the measuring roller 6 is detected by a rotary encoder 20 directly connected to the motor 4. is configured to be transmitted to. This rotary encoder 20 detects the amount of rotation of the measuring roller 6 via the motor 4, converts this into an electrical signal, and generates a pulse train as a digital quantity. Therefore, an encoder having the necessary resolution can be selected and used depending on the accuracy required for the measurement of test) 1.

The pulse train from the rotary encoder 20 is output to the pulse count interface 21, and the pulse count interface 21 counts the pulse train and integrates it over a predetermined period of time, and outputs the output data. is placed on the data bus and sent to the storage/arithmetic unit 22. At that time, the control of this accumulation period is as follows:
located above the measuring roller 6 and the pulse count
Mark sensor 10 directly connected to interface 21
O Sunawachi, which is performed by the pulse output from
An interrupt pulse is generated by the output pulse from the mark sensor 10, which provides the timing for inputting the output data of the Hull count interface 21 to the memory calculation unit 22. Then, the storage/calculation unit 22 receives this interrupt pulse and temporarily stores the fetched data in the memory, or immediately calculates the data. The storage/calculation unit 22 calculates the inner circumference of the sample based on these data, calculates the inner diameter from the calculated inner circumference, and calculates the average value of the inner diameter calculated multiple times by 1. Alternatively, various necessary statistical values are calculated, such as calculating minimum and maximum values.

The calculation code obtained by the storage/calculation section 22 is decoded by the numeric display interface 26 and converted into a numeric pattern, and the necessary digits are displayed on the numeric display section 24. This number display section 24 may be a number display using an LED, and it may be displayed by using a printer if necessary, or alternatively, by simply blinking a lamp for inspection of rejected products, etc. It may be configured as follows. Reference numeral 25 is a keyboard used to write data on the start and end of measurement of the measuring device, selection of display contents, and number of measurements into the memory φ calculation unit 22, and a keyboard that scans this keyboard 25 and codes it. 1 interface 26, the above-mentioned various data can be input into the storage/calculation section 22 in advance.

As mentioned above, the rotation amount measuring means according to this embodiment is constituted by the rotary encoder 20, the pulse count interface 21, the mark sensor 10, and the memory/calculation section 22, and the 1 digit display means is a numeric display interface. 26 and a numerical display section 24.

Next, the operation of the measuring device according to the present invention and how to use this device in measuring the inner diameter of a sample will be explained.

When measuring the inner diameter of the sample 7, first apply an appropriately selected identification mark 8, such as a light-reflecting film, to an arbitrary point on the endless sample 7, and then place the sample 7 on the measuring roller 6. The specimen is prepared by suspending it and inserting the hanging two sides of the specimen between a pair of guide pins 13, 13 below the measuring roller.

At that time, the number of measurements for one sample and the average value or, if necessary, the minimum value and deviation value, etc., are input in advance to the storage/calculation section 22 via the keyboard interface 26 by operating the keyboard 25. It is necessary to keep

After performing the above settings, when the motor 4 is driven by a key operation, the measuring roller 6 begins to rotate, and the sample 7 also begins to rotate accordingly. From the point at which the rotation starts, the rotating needle of the measuring roller 6 is input as a pulse train to the pulse count-in surface 21 via the encoder 20. For example, when the mark sensor 10 first detects the identification mark 8 using a reflective light projector/receiver, it is transmitted to the pulse count interface 21, and from that point on, the identification mark rotates once, and then the mark Until the time of detection is reached, the above-mentioned pulse train is counted by the pulse count interface 21 and integrated as a pulse of the inner circumference length of the sample.

Here, if the inner diameter of one sample is measured three times and the average value is taken as the final inner diameter value, the inner circumference length output from the pulse count interface 21 is The product data of is taken into the storage/operation unit a 22, where the data of the inner circumference length is divided by the pi ratio (D
= L/π), and this inner diameter is stored in the memory. Subsequently, after calculating and storing the second and third fjt calculation data, their average value is calculated, and the result is displayed on the numerical display section 24 via the numerical display interface 26, and the final value of the inner diameter of the sample is calculated. Therefore, a value can be obtained.

The specific embodiments described above are described by way of illustration to illustrate the preferred structure and operation of the present invention;
It will be understood that various modifications may be made without departing from the spirit of the invention.

The measuring roller used in this apparatus can be arbitrarily replaced with an appropriate roller according to the shape of the endless sample, and its material can be appropriately selected from the viewpoint of preventing the sample from rotating. For example, by providing fine irregularities on the surface of the roller, the coefficient of sliding friction can be increased, and in order to reduce the optical reflectance of the mark sensor, it is also possible to apply a thermoelectric surface treatment to the measuring roller. You can do it freely.

The mark sensor does not necessarily need to be installed above the measuring roller as long as it is installed in a position where it can detect the identification mark on the sample. Further, the type of the optical switch can be appropriately selected depending on the type of the identification mark, such as a proximity switch or an image sensor.

When the rotating surface shakes when the sample is rotated,
In order to prevent this, an appropriate sample guiding means such as the illustrated guide bottle may be provided. Furthermore, in order to prevent the sample from rotating on the measuring roller and from rotating and wobbling, it is effective to rotationally drive the sample using a presser roller that contacts the sample and presses it from above the measuring roller. In this case, the pressing force and the parallelism of the surfaces of the measuring roller and the holding roller make it easier for the sample to run smoothly. Moreover, even if the sample is made of a highly elastic and easily deformable material, such as a rubber material, the inner diameter dimension is not affected in any way by the pressing force of the presser roller. This is because such a pressing force acts in the thickness direction of the sample, and rather acts in a direction to remove the influence of the inner and outer surfaces of the sample, so that it approaches the true value of the inner diameter. Therefore, when a presser roller is provided, it may be set so that its pressing force can be adjusted depending on the thickness of the sample.

Furthermore, in the above embodiment, the sample is suspended on a measuring roller connected to a rotary encoder, and the inner diameter or inner circumference length of the sample is measured by the rotation of this measuring roller, but the outer diameter of the sample is Alternatively, when measuring the outer circumference length, it is easily understood that it is sufficient to connect a roller, such as the above-mentioned presser roller, that is in contact with the outer surface of the sample to an encoder and measure the number of rotations of this roller.

On the other hand, the case where a computer is used as a control system of a measuring device has been described, but this is because it is convenient to use a computer for statistical processing or systematization of the device.

Therefore, it is sufficient to have at least a device S for directly displaying measured values without using a computer. For example, a circuit configuration may be adopted in which measurement data passes from a pulse count circuit to a code converter, passes through a numeric display drive circuit, and is displayed in numbers.

As described above, according to the present invention, the inner diameter or outer diameter and the corresponding length of an endless ring-shaped sample can be measured without interference from the measurer, so that any person can easily measure the inner diameter or outer diameter and the corresponding length. It is possible to obtain measured values with high accuracy. In particular, when the sample is an elastic body and its wall thickness is less than 1 inch, the conventional technique tends to expand and contract even with a slight measurement pressure, resulting in measurement errors. Since no measurement pressure is applied that would affect the inner diameter measurement, even samples with a wall thickness of 111II+ or less can be measured with high accuracy. On the other hand, this device can be manufactured in a small size, and since there is no movement of measurement parts during measurement, even large-diameter samples can be measured in a short time, and measurement time can be shortened.

Furthermore, since the measured values can be displayed numerically rather than on a scale, they can be read at a glance, and errors can also be expressed as absolute values when inspecting samples. On the other hand, desired applications such as simply displaying the pass or fail judgment of a sample with a lamp can also be achieved.

[Brief explanation of drawings]

1 and 2 are schematic views of the main body of a measuring device according to the present invention, with FIG. 1 being a side view and FIG. 2 being a front view thereof. FIG. 311 is a diagram showing an embodiment of the measuring roller used in the present invention. FIG. 4 is a block diagram of the control system of the present invention. Explanation of symbols 4... Motor; 5... Rotating shaft; 6... Measuring roller near... Measured object; 8... Identification mark; 1o...
13... Guide tip; 20... Encoder; 21... Pulse count e-interface; 22... Memory/calculation section; 26... Numerical display interface; 24... Numerical display Part; 25... Keyboard; 26... Keyboard interface. Patent applicant: Microsystems Co., Ltd. Agent: Yasushi Kaizu, patent attorney: Yasuyuki Dohira, patent attorney Figure 1 Figure 2 Figure 3

Claims (11)

[Claims] (1) A rotating means for mounting the inner edge of an endless ring-shaped object to be measured and rotating the object along its inner or outer circumference, and rotation of the rotating means corresponding to one revolution of the object to be measured. A rotation amount measuring means for measuring the amount of rotation, and an inner diameter, an outer diameter of the object to be measured, or a value corresponding to these, based on the rotation amount of the rotation means corresponding to one revolution of the object to be measured measured by the rotation amount measuring means. A measuring device for an endless ring-shaped object, comprising: a display means for displaying. (2) The rotating means includes a measuring roller and a holding roller for preventing rotational slip of the object to be measured, so that the object to be measured runs between the measuring roller and the holding roller. A measuring device according to claim 1. (3) The measuring device according to claim 2, wherein the measuring roller is provided with a flange on its negative side and an adjustable washer on its other side. (4) The rotating means includes a roll for suspending the inner edge of the object to be measured, and a measuring roller that is in contact with the outer edge of the suspended object and has an outer diameter of the object to be measured or a value corresponding thereto. A measuring device according to claim 1. (5) The measuring device according to claim 1, wherein the rotation means includes a guide means for preventing rotational shake of the object to be measured. (6) The guide means has a pair of guide pins located below the measuring roller and between which both side parts of the object to be measured pass. measuring device. (7) The rotation amount measuring means includes a sensor that detects an identification mark attached to an arbitrary point on the object to be measured, and a rotation sensor that detects the amount of rotation of the rotation means during a period in which a detection signal is received from the sensor. 2. The measuring device according to claim 1, further comprising a scene detecting means. (8) The rotation amount detection means includes a count means for counting the rotation amount of the rotation means during the period when the detection signal arrives from the sensor, and a calculation means for calculating the rotation amount accumulated by the counting means. A measuring device according to claim 7, comprising: (9) The rotation amount detection means includes a count means for counting the rotation amount of the rotation means during the period when the detection signal arrives from the sensor, and a calculation means for calculating the rotation amount integrated by the counting means. The measuring device according to claim 7, further comprising a storage means for storing the calculated data. (10) The arithmetic means calculates a
calculating the amount of rotation of the inner edge of the object to be measured for each rotation, sending the calculated data to the storage means a plurality of times, and retrieving the calculated data of the plurality of times from the storage means; 9. The measuring device according to claim 8, wherein the measuring device calculates the statistical value. (11) The measuring device according to claim 1, wherein the display means includes a numerical display for numerically displaying the inner diameter of the object to be measured and a value corresponding to the inner diameter.