JPS6139285Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a measuring device and aims to eliminate errors caused by miscounts and improve operability by shortening reading time by giving the signal read during length measurement a code unique to its position. BACKGROUND ART In machine tools, etc., in order to finish the dimensions of a workpiece according to specifications, it is necessary to perform precise measurements using a measuring device. Conventionally, measurements have been made using optical measuring devices that optically magnify and read vernier scales, but because the scales are read by humans, there are problems such as individual differences in readings and increased fatigue. . However, by applying recent developments in electronic technology to measurement technology,
It has become possible to obtain measurement values with higher precision and no individual differences, and it has also become possible to continuously read positions that move at high speed. As such a measuring device, there is one that counts the number of pulses recorded on a magnetic tape or the number of lights that have passed through a lattice, and measures the length based on the cumulative number from a starting point. However, in these devices, if the number of pulses or the number of transmitted light is miscounted, the error that has occurred may remain until the end and may accumulate. Therefore, there was a problem in that it was necessary to return to the starting point each time to correct any errors, and if the power was turned off, the readings would disappear and the counting would have to be started again from the starting point. The present invention solves these problems by constantly reading the scale at the current position, preventing errors caused by miscounts, and improving operability by eliminating wasted time due to re-counting from the starting point. It is.
To this end, we use indicators with unit lengths that differ at a certain ratio, such as indicators in units of 1 mm, 1 cm, and 10 cm, with different amounts of light inside and outside the indicators, and these 1 mm, 1 cm,
Indicators in units of cm and 10cm are arranged in parallel so that the lengths of each indicator correspond. Each index row is shifted stepwise by one index, and is defined as a numerical value from 0 to 9, making one set of 10 indexes. 1 indicator in order,
The 2nd index... is arranged in a stair-like manner, and when the 11th index is reached, it becomes the 1st index of the next group, and the 1st index of the previous group.
It is placed at the same position as the index. In each of these index rows of unit length, auxiliary scales having different amounts of light inside and outside the index are arranged at the boundaries of the index and extend alternately at right angles to the length direction of the index. Then, the changes in the light intensity of the 10 indicators of each index row and the extended portions of each auxiliary scale are guided to the reader using multiple waveguides.
Show the current reading on the display. A plurality of waveguides are arranged in a line perpendicular to the index row, and vernier waveguides are arranged in the length direction in the overlapping part of the auxiliary scale of the minimum unit length index (1 mm unit). The numerical value of each unit and the numerical value below the minimum unit are read in one sitting. In addition, when the waveguide row is located at the boundary of the index, a circuit is installed in the reader that cuts the lower numerical values of the same index row using signals from parts alternately extended from the auxiliary scale. Prevents numerical values from being displayed. In this way, according to the present invention, the waveguide array always introduces the index value of the current position into the reader through the waveguide and displays it on the display, so errors due to miscounts do not occur and errors can be corrected. This eliminates the need for re-counting from the starting point, and even if the power is cut off, the numerical value at the position where the waveguide array is stopped is displayed when reconnecting, improving operability. Next, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a plan view of a scale provided with an index according to the present invention, and FIGS. 2 and 3 are a front view and a side view of the entire device. The opaque scale 1 is provided with a graduation 2 in units of 1 mm, which is a main graduation for reading, a graduation 3 in units of 1 cm, and a graduation 4 in units of 10 cm. These main scales 2, 3, and 4 are made up of rows of indicators 21, 31, and 41 of unit length, each having a different amount of light from the scale 1, such as a substance that transmits light, a through hole, or a luminous body, and each indicator 21 , 31, and 41 are arranged in parallel with corresponding lengths. Each of these indicators 2
1, 31, and 41 are arranged in a stair-like manner at right angles to the length direction (measurement direction) for each index, forming a set of 10 indexes, and each index is specified as a numerical value from 0 to 9. . 10th (number is

[9]), the first index of the next set (the numerical value is

[0])
The 10 indicators are arranged consecutively as one set so that the index is placed at the same position as the first indicator of the previous set. The main scales 2, 3, and 4, which are composed of columns of each index 21, 31, and 41, each have a column of each index 21, 31, and
Auxiliary scales 56 and 7 are provided at the boundaries between numbers 1 and 41. The auxiliary scales 5, 6, and 7 have different light amounts from the scale 1 like each index, and each index 21,
Overlapping part 5 with an interval of the length of 31 and 41
Extension portions 52, 62, 72 are provided alternately at right angles to the length direction from 1, 61, 71. The signal from this extended portion becomes a signal for cutting the lower value when the reading is located at the boundary of the index during measurement. Moreover, the overlapping portion 51 of the main scale 2 of the minimum unit length serves as a vernier scale. Indicators 21 and 3 of each of these main scales 2, 3, and 4
1, 41 and extensions 5 of auxiliary scales 5, 6, 7
The light amount changes of 2, 62, and 72 are introduced into the reader 8, and the changes are converted into numerical values and displayed on the display 9.
Introducing step-like indicators 2 for each main scale 2, 3, and 4
1, 31, 41 and both extension portions 52, 62, 72 of each subscale 5, 6, 7, waveguides 10, 11, 12, and 13, such as optical fibers,
14 and 15 are arranged in a line perpendicular to the measurement direction. That is, each main scale 2, 3, 4 is connected to the waveguide 10, 1.
1, 12 are read in one sai, auxiliary scale 5,
A total of 36 waveguides are arranged in a row so that the number can be limited by 6 and 7 waveguides 13, 14, and 15. As shown in FIGS. 2 and 3, the waveguides 10..., 13... are connected to indicators 21, 31, 41, which are slits in the figure, in which light from the light source 16 on the bottom surface of the scale 1 is directed.
transmits the light to the reader 8. As a result, the index at which the waveguide array is located on each of the main scales 2, 3, and 4 is detected and displayed on the display 9. Further, the waveguides 13, 14, 15 have alternately shifted extension portions 52, 62 of the auxiliary scales 5, 6, 7,
72 light is detected, and when the array of waveguides 5, 6, and 7 is located at the boundary between indicators, it works to cut out the lower numerical values. For example, when the waveguide 10 of the reader 8 is located at the border between "2" and "3" of the 1 mm unit length index 21, one of the waveguides 13 is located at the lower extended portion 52 of the auxiliary scale 5. The light is detected and transmitted to the reader 8, and the output of "2" to the display 9 is cut off. Further, a vernier waveguide 17 is provided in the overlapping portion 51 of the auxiliary scale 5 having the minimum unit length to read numerical values of 1 mm or less. In the vernier waveguide 17, the waveguides are arranged in a line at intervals of n equal parts of the length corresponding to the n-1 scale of the auxiliary scale 5, and the vernier waveguide 17 is arranged in a line at intervals of n equal divisions of the length corresponding to the n-1 scale of the auxiliary scale 5. The light is transmitted to the reader by the optical waveguide 17,
Values of 1 mm or less are detected. In this way, both the extension parts 5 of the main scales 2, 3, 4 and the auxiliary scales 5, 6, 7
The waveguides 10, 11, 12 and 13, 14, 15 that transmit the light intensity changes of 2, 62, 72 to the reader 8 are arranged in a line perpendicular to the measurement direction, and are suitable for measurements of the minimum unit length index 21 or less. In this example, a vernier waveguide 17 is provided in an overlapping portion 51 of the auxiliary scale 5. Next, a measurement operation using the measuring device of the present invention will be explained. The scale 1 is fixed to the main body of a machine tool or the like, and the reader 8 is fixed to a movable table. Conventionally, to measure the dimensions of a workpiece, the dimensions were measured by aligning the starting point "0" with the starting point of machining the workpiece, moving the moving table, and counting the number of pulses and slits. The reader 8 reads the value of the base point for machining the workpiece on the scale 1 and displays it on the display 9.
All you have to do is move the moving table until that value is reached. In addition, the waveguides 10, 11 from the starting point "0",
12, that is, the current position of the waveguide 10..., the waveguide 10... derives the numerical value specified by each unit length index 21, 31, 41, and the reader 8 reads it. displayed on the display 9. 1 in Figure 1
When the rows of waveguides 10, 11, and 12 are located at the positions indicated by the dotted chain lines, the first index 41 of the main scale 4 in 10 cm units, which the waveguides 12 transmit to the reader 9, is a value of "0". , the second index 31 of the main scale 3 of 1 cm unit transmitted by the waveguide 11 is "1", and the 13th index of the main scale 2 of 1 mm unit transmitted by the waveguide 10 (the second set) Since the index 21 (third index) is defined as "2", the numerical value "012" is displayed on the display 10 as shown in FIG. In addition, 1
Measurements below mm will be explained with reference to FIG. At the overlapping part 51 of the auxiliary scale 5, there is a vernier waveguide 17 that can read down to 1/50mm.
arranged at intervals of The 30th waveguide 17-30 of this vernier waveguide 17 overlaps at 5
1, other waveguides 17-0 to 17-50
If the waveguides 17-30 are offset from the waveguides, only waveguides 17-30 will transmit light to the reader. As a result, the read value below the minimum unit length becomes "30", and the read value at the position shown by the dashed line in FIG. 1 becomes "012,30".
Next, using this “012, 30” as the base point for processing, the first
When the moving table is moved to the position shown by the two-dot chain line in the figure, the main scale 4 in 10 cm increments is "0", the main scale 3 in 1 cm increments is "5", and the scale 2 in 1 mm increments is "4" and "5". '' boundary, one of the waveguides 13 transmits light to the reader 8 at the lower extended portion 52 of the auxiliary scale 5, cuts off the number "4", and displays only "5". Therefore, 42.70 mm is measured by moving from the initial position "012, 30" to "055, 00".
Note that the first indicators 31 and 41 indicating the numerical value of "0" for the 1 cm and 10 cm indicators may not be provided if it is difficult to read when "012, 30" is displayed on the display 9. As described above, the present invention reads 10 indicators defined by numerical values from 0 to 9 on each main scale, and divides the numerical values at the indicator boundaries using the auxiliary scale. In addition, the overlapping portion of the auxiliary scale of the minimum unit length indicator is used as a vernier scale to measure the minimum unit length of the main scale. For this reason, according to the present invention, the waveguide always transmits an index of the current position, that is, a specified value, to the reader and displays it on the display, so errors due to miscounts do not occur, and errors can be corrected. This eliminates the need for re-counting and improves operability.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a plan view of the scale, FIGS. 2 and 3 are front and side views of the entire device, and FIG. 4 is an enlarged view of the vernier scale. In the figure, 1 is the scale, 2 is the index in 1 mm units, 3 is the index in 1 cm units, 4 is the index in 10 cm units,
5 is 1mm auxiliary scale, 6 is 1cm auxiliary scale, 7 is
Auxiliary scale for 10cm, 10 is 1mm index waveguide, 11
is a waveguide with a 1cm index, 12 is a waveguide with a 10cm index,
13 is a waveguide for 1 mm auxiliary scale, 14 is a waveguide for 1 cm auxiliary scale, 16 is a light source, and 17 is a waveguide for vernier.

Claims (1)

[Scope of utility model registration request] The inside of the index of unit length that differs at a constant ratio is made to have a different amount of light from the surrounding of the index, and the lengths of multiple indexes of each unit length are matched and arranged in parallel, and each index row of unit length is one index. The main scale is made up of a set of 10 indicators that are staggered at right angles to the length direction in a stepwise manner, and is set to a numerical value from 0 to 9. The auxiliary scales, which differ in the amount of light from the surroundings, are alternately extended from the overlapping part at right angles to the length direction, and are located at each boundary of each index, and are provided for each index row of each unit length. A plurality of light guides are arranged in a line perpendicular to the measurement direction, and are arranged in a line perpendicular to the measurement direction, and are arranged in a line perpendicular to the measurement direction. Multiple vernier light guides are arranged in the length direction in the overlapping part of the auxiliary scales of the index row, and when the light guide row is located at the boundary of the index, the signals from each auxiliary scale are used to detect the lower numerical value of the same index row. A measuring device configured to have a reader equipped with a circuit that cuts the voltage and display the read value on a display.