JPS62198711A - Electronic display type caliper - Google Patents

Abstract

PURPOSE:To obtain a high-accuracy caliper which holds and resets a measured value automatically by holding or resetting the display of an electronic display device according to whether the movement of the caliper is within a specific range or not. CONSTITUTION:Jaws 6 and 8 of a main scale 1 and jaws 5 and 7 of a slider 2 mounted movably on the main scale 1 abut on measurement positions of the object of measurement. The quantity of the relative movement displacement of this slider 2 from the main scale 1 is detected by an encoder 30 and the display device 22 connected thereto displays a measured value electronically. Then, a current call value from the counter 15 of the encoder 30 and data found from last call values of respective cycles are stored 17. This data is used to hold the display value on the display device 22 when the slider 2 moves from a reference position preset by an arithmetic control circuit 16 in such a direction that the jaws 5 and 7 leave the measurement positions, and also to reset the holding of the value when the slider 2 moves beyond a specific distance range and is inverted to move, thereby displaying the current position of the slider 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic display type caliper, which enables a measurer to automatically hold and release a measured value without operating a special switch or the like. This paper relates to improvements to electronic display type calipers.

[Background technology and its problems]

Electronic display calipers are becoming widely popular because they have better measurement accuracy and are easier to handle than so-called mechanical calipers that read measured values from scales carved on a slider and a main scale.

Conventional electronic display calipers require relative movement between a main scale that has one jaw and a slider that is movably attached to the main scale and has another jaw that comes into contact with one jaw between the measurement parts of the object to be measured. Capturing the amount of displacement with an encoder,
The encoder is configured with a measuring means that can display the measured value digitally or/and analogously on an electronic display, and the encoder is configured to measure the relative movement displacement I! , a sensor based on a photoelectric, capacitive, or magnetic principle, a pulsing circuit that converts the output signal from the sensor into a digital signal, a reversible counter, etc. Therefore, the measured value is displayed digitally as it is on the counter, but for measurement purposes, there may be cases where a clear switch is provided to force the contents of the counter to zero, or a hold switch is provided to hold the displayed value. there were.

Conventional electronic display calipers with a hold switch hold the measured value displayed on the electronic display by holding the object to be measured between the two jaws, and then hold the measured value displayed on the electronic display by operating the hold switch. It had the advantage of being readable.

However, the following problems have been pointed out in conventional electronic display type calipers due to the expansion of the field of application and the demands of industry for higher accuracy.

■When measuring the wall thickness of a convex part inside a deep-bottomed pipe, etc., when visual inspection was not possible, it was difficult to grasp the timing to operate the hold switch, resulting in poor work efficiency.Furthermore, there were situations in which the hold switch could not be operated, resulting in work being impossible.

■Even if both jaws are brought into contact with the object to be measured in the best condition for accuracy, it is difficult to ensure accuracy because the posture of the main scale changes due to the pressing force when the hold switch is operated. In many cases, there was no way to confirm this, resulting in defective products.

■To measure a hot workpiece after reading the measurement value, it is necessary to operate a switch to release the hold, so not only do you sometimes forget to release the hold, but you also have to hold and release the hold every time you measure one object. It was painful to operate the switch twice.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and it is possible to automatically hold and release a measured value by using the movement of a slider without requiring special switch operations. An object of the present invention is to provide an electronic display type caliper with high precision and excellent handling properties.

[Means and effects for solving the problems] The present invention has the following features:
Electronic display type calipers require so-called sagging work to ensure optimal contact between both jaws and the object to be measured, and the other jaw of the slider must be measured between the end of the contact work and the completion of reading. There is an inherent problem with the actual measurement work, such as separating the product from the object, and the fact that it induces new work to replace the conventional hold switch operation, such as changing constants even if the object to be measured changes to the same type of product or a different type of product. For example, when automatic selection is made to measure the external dimensions of a round shaft member, the measurement values on the electronic display are updated at regular intervals during the sagging work, and the minimum measurement value is automatically selected. On the other hand, even if the slider moves away from the object to be measured, the hold state is maintained within a certain range so that the measured value can be read, and when the slider is moved beyond the certain range, the The system was designed to release held measured values and prepare for the next measurement task. In particular, as a requirement for canceling the measurement value, if the slider deviates from a certain range,
The condition is that the slider is moved a certain amount in the opposite direction from there, and the above-mentioned certain range is characterized in that it does not need to be changed each time regardless of the size of the object to be measured.

Specifically, the slider includes a main scale having a groove on one side, a slider that is movably attached to the main scale and has a groove on the other side that is brought into contact with the one jaw between the measuring parts of the object to be measured, and An electronic device comprising: a sensor for detecting the amount of displacement relative to the main scale; an encoder formed including a counter; and an electronic display connected to the encoder and electronically displaying a measured value. In the surface water type caliper, a storage means for storing, in the measuring means, a current call value read from the counter, a previous call value read every cycle, and data obtained from the current call value and the previous call value; When the slider moves in the direction away from the measurement part of the object to be measured within a range that does not exceed the distance MI from the reference position preset using the data stored in the storage means, the electronic Hold the display value on the display and hold the electronic display when the slider moves in the direction of the measurement part of the object to be measured by a distance M2 that exceeds the distance M and includes a preset zero. An arithmetic control circuit is provided which has a function to release the slider and display the current position of the slider, and to hold and display the measured value of the object to be measured in the optimum state, and also to automatically display the measured value of the object to be measured in the optimum state, and automatically before measuring the next object to be measured. The system was configured so that the hold could be released.

Therefore, in the above case, the minimum value is automatically held, and the held measurement value can be read at any position unless the slider is moved in the reverse direction dg.
In addition, even if there is a slight displacement of the slider in the opposite direction beyond the certain range, the hold will not be released if the displacement is less than a certain amount, which eliminates the inconvenience caused by backlash in the caliper structure, and the next It works so that the hold is automatically released before measuring the object to be measured.

〔Example〕

An embodiment of the electronic display type caliper according to the present invention will be described with reference to the drawings. This embodiment is shown in FIGS. 1 to 4, and has a main scale 1 for raising one jig 6 and a one-way measuring jig 1-8 on the tip side, the other jig 5, and the other inner measuring jig 7. A caliper body is constituted by a main scale 1 and a slider 2 slidably guided.

An encoder 30 is composed of a sensor 13, a pulsing circuit 14, and a counter 15, and the encoder 30 and the electronic display 22 form a measuring means.

The sensor 13 is of a capacitive type in this embodiment, and the electronic display 22 digitally displays the measured value.

The slider 2 includes a power switch 9 for driving the measuring means, a hold switch 10 for holding the displayed value on the electronic display 22 as it is, and a clear switch 11 for forcing the displayed value to zero. is provided. Since the above is no different from the conventional one, further explanation will be omitted.

Next, 12 is a mode selection switch. 1 manual” and “
``Automatic'' and ``Manual.''

When this happens, the current value of the slider 2 is displayed on the display 22 as in the conventional case.

On the other hand, when "automatic" is selected, the arithmetic control circuit 16,
It operates to activate the storage means 17 to exhibit the characteristic functions of the present invention.

That is, the arithmetic and control unit 16 selects the mode selection switch 1
When the automatic selection command from 2 is input, the command signals from the hold switch 10 and the clear switch 11 are cut off.
The count value is read from the counter 15 in a fixed procedure, and predetermined arithmetic control is performed using the data stored in the storage means 17. In addition, 21 is a constant setting device and the distance vi Ia
: Mz.

The storage means 17 stores the current call value, which is the counted value read from the counter 15 by the arithmetic control circuit 16.

A register 18 that stores the value, and a B register 19 that stores the previous call value shifted from this A register 18.
and a storage element 20 that stores data N etc. obtained by calculation by the calculation control circuit 16. In the initial state, the B register 19 is configured to store the current call value stored in the A register 18.

Therefore, the arithmetic control circuit 16 calculates N from the current call value stored in the A register 18, the previous call value Db stored in the B register 19 (D, -〇, -N), and calculates this difference N. It has a function of making a comparative judgment by comparing the distance M, etc., and also has a function of outputting a measured value to the electronic display 22 and driving it.

This embodiment will be described in more detail for each type of measurement B, mainly with reference to FIGS. 3 and 4, taking external shape measurement as an example.

The slider 2 is moved to bring the other jaw 5+-5 into contact with the jaw 6. This contact point is P. shall be. If the clear switch 11 is turned on in the state of contact, the value displayed on the electronic display 22 becomes zero. Thereafter, when the mode selection switch 12 is selected to "auto", the initial state of the probe (2) shown in FIG. 3 becomes YES, and the contents of the A register are transferred to the D register at block (2). Then move slider 2 to the other side! ! -5 is moved in the direction away from the gear a-6 (hereinafter referred to as the "reverse direction", and the opposite direction is referred to as the forward direction), and then Good. ) measurement site on one side! 1-6
1, then move the slider 2 in the forward direction again and sandwich the measurement part of the reference body (the same as the measurement target W in Fig. 4) with both jaws 5 and 6. The value displayed by the electronic display 22 becomes the actual size of the reference body, that is, the measured value. Here, the measured value of this actual size is the reference distance M M
s, the contact point or surface between the reference body in this state and the other J=I-5 is defined as a reference position P. Note that the distance M1 preset by the constant setter 21 is the reference position P.
It is a constant distance from 1 to position 1 P + + measured to the right in the figure, and the distance Mt is the range beyond the distance M to the right in the figure, that is, beyond the position P. This is a constant distance when the slider 2 is moved in the forward direction from an arbitrary position P2.

The distances M and M2 are arbitrarily determined based on the measurement method, etc., but in this example, M + -20 mm, M
! -2 mm. Further, the dimension of the reference body is 15 mm.

Therefore, according to the above procedure, the reference distance M, which is 15 mm in total, is digitally displayed on the electronic display 22. In addition,
At this point, this 15 mm is stored in the B register 19.

Ichino "J" Bi- Move the slider 2 in the opposite direction to 1 pz.

During this time, although the counter 15 is calculating the position of the slider 2 with reference to the contact point P0, the electronic display 22
The displayed value remains 15 mm. Then, when it is returned in the opposite direction by M, -2 mrn or more, the hold is released and the current position of slider 2 (more specifically, the current position of the contact surface of slider 2 on the other side of ji = 1-5) is displayed on the electronic display 22. Ru. In this manner, the object to be measured W1 is prepared in a state where the other one, Ji=1-5, is separated from the one, Ji*-6.

When the slider 2 is moved in the forward direction, the value displayed on the electronic display 22 gradually decreases, and the jaw 5 comes into contact with the measuring part of the object W. In this case, the displayed value is 14
It shall be indicated as mm.

Here, if the other jaw 5 is brought into contact with the object W1 to be measured in an appropriate posture and with a measuring force, so-called saguri work is performed, and if the previously displayed value of 14 mm is the true dimension of the object W1 to be measured, then the slider 2 is moved in the vicinity of the object W1 to be measured. No matter how you move it, that 14mm
The display remains unchanged and the measured value is held. However, if the true dimension of the object to be measured W is 14 mm or less, the displayed value is further updated, and in this case, the minimum value is held because of the external shape measurement.

This is due to the function of the arithmetic ff1l control circuit 16, and will be explained with reference to FIG.
, 5) mm, A register 18 in block ■
The contents of 14 (13, 5) called from counter 5
mm is stored as the current call value D1. As mentioned above, the memory contents of B register 19 in block ■ are Db-15m.
Since it is assumed to be m, in this time, N in block ■
o, and as a result, in block ■, DIl-Dk = 1
4 (13°5)-15--1(-1,5)-N is calculated.

Therefore, the determination of N≧O in block ■ becomes NO, and in block ■, the current call value D-” of the A register 18
14 (13,5) mm is stored in the B register 19 as the previous call value Db. Then, the content of the B register 19 becomes Db'' 14 (13°5).Here, the displayed value of the electronic display 22 is changed to B by the process of the block [phase].
The contents of register 19 are 14 (13,5)
mm is displayed, and unless the mode selection is changed, the process proceeds to block (2) again via block (2). In this manner, the minimum value of the measurement object WI is determined for each cycle time during the sagging operation. This means that in the next cycle time during the sagging operation, if the slider 2 moves due to inappropriate contact with the other jig g-5 and the count value of the counter 5 becomes 14.5 mm, then A register 1
8 glue, -14.5mm (block ■), N=DIl
-Db = 14.5-14 (13,5) = 0.5
(1,5>mm (block ■), so in block ■ N≧O becomes Yes, and slider 2 is still within the range that does not exceed distance M1 in the opposite direction, so in block ■ it becomes N5M, and in block ◎ The previously memorized previous recall value of 14 mm (in this cycle, Pro 7
This is clear from the fact that the image (which is unchanged because the process does not go through ri) remains displayed.

亙U Measurement (2) is a process of reading the measured value held in measurement (1), and also reads the next measurement object W1. The other side is separated from the s-5 in order to be replaced.

Now move the slider 2 in the opposite direction within a distance of N M 1, that is, at the position P.
, the value stored in the B register 19 will not change no matter how the count value of the counter 5 and the stored value D3 of the A register 18 change, so D, −Db − Since N≧0, block ■
, N5M becomes Yes, and the display value of the electronic display 22 from block 0 remains held at 14 mm.

This is to clear the displayed value held on the electronic display 22 in preparation for the measurement of the next object W to be measured.

Now, when slider 2 moves in the opposite direction and passes position RP, the count value of counter 5 becomes Ms +MI'+α=15
+20+αx35+αmm, so the current call value of A register 18 becomes 35+αmm, and N in block ■.
Since -D, -Db = 35+α-14-21+αmm, block (2) becomes Yes and block (2) becomes No. However, since there is no forward movement in block ■, it is judged as No, so the value displayed on the electronic display 22 is still 14 m.
It remains m. This means that even if the position P is exceeded and there is some play in the slider 2 with respect to the main scale L, which corresponds to forward movement, the displayed value will not be automatically canceled unless the operator has a positive intention. It is decided not to do so. Therefore, there is no need for the operator to handle the arbitrary P11 quantitatively and carefully. It is understood that the distance NM2 should be determined by the structure of the caliper, such as its backlash, and the inherent properties of the caliper.

Then, move the block ■ beyond the position iZ' P + 1 to Y
es, and if there is a forward movement of distance M2 in block ■, it is assumed that the worker intends to measure the next object to be measured WII, and in block ■, the A register 18 is changed. The call value (D, -35+α) this time is B
Previously called value of register 19 (Db = 35 + αmm
), and the stored contents of the B register 19, ie, 35+αmm, are displayed as the current value on the electronic display 22 in block [phase].

At this point, the hold on the display on the electronic display 22 is automatically released.

When the 1L varnish slider 2 moves in the forward direction, the electronic display 22 is displayed at block 0 via blocks ■, ■, ■ at each cycle time.
The displayed value is the content stored in the B register 19, that is, the current position of the slider 5 (specifically, the measurement surface of the other jaw 5). Then, when the measurement step (2) is entered, the minimum dimension of the next object W to be measured can be determined.

Therefore, in this embodiment configured as described above, first the slider 2 is moved to move both sides! -5 and 6 are brought into contact, the clear switch 11 is operated to display zero on the electronic display 22, and after setting this to position P0, the mode selection switch is switched from "manual" to "automatic". Then, the slider 2 is moved in the opposite direction, and the slider 2 is moved in the forward direction again so as to sandwich the first object W to be measured, and the other jaw 5 is placed in the measurement area on the opposite side of the measurement area that is in contact with the one jaw 6. When it comes into contact with , the sensor 13 detects the distance between Po and PI, that is, the reference distance Ms (the dimension of the measurement object W1), and displays it on the electronic display 22 via the pulsing circuit 14 and the counter 15. In this case, because of the initial state, the contents of the A register 18 and the B register 19 of the storage means 17 are Da > I), so the display contents of the electronic display 22 remain held, while on the other hand, if <Db, a new counter 5
The current call value DA, which is the coefficient value, that is, the stored content of the A register 18, will be displayed on the electronic display 22. In other words, it is always updated to the minimum value and displayed. Therefore, optimal measurement values can be obtained even when working in areas that are not visible to the naked eye or in areas where hands are extended far away. Even if the slider 2 is moved backwards and removed from the measurement object W1 in order to obtain the measured value at hand, the measured value is held and displayed, so it can be reliably read from the electronic display 22.

In such a case, even if the slider 2 is moved in the opposite direction, the preset distance M1 must not be exceeded, and even if it is exceeded, the slider must be returned by Ms in the forward direction again, even if there is some play in the caliper. Also, the hold display will not be canceled inadvertently.

Next, in order to measure the next object to be measured W, the operator must cancel the previous hold display when there is a distance M□ in the forward direction in the range of distance MM, that is, an area beyond the position The hold state will be automatically released. Therefore, automatic cancellation can only be achieved with the positive intention of the worker.
You can start the next measurement without operating any switches.

As described above, according to the embodiment, it is possible to carry out the sagging work even when measuring thickness in a place that cannot be visually seen by the operator, so it is possible to perform measurements with the jaws in optimal contact with the object (location) to be measured. . Its effectiveness is ensured even if the Il subdivision lF@ (corresponding to the display value of the smallest display digit of the electronic display 22) is 1 μm. Furthermore, since the measured value is held even if the slider 2 moves, the caliper can be read at hand, improving work efficiency. In addition, the hold state will not be released inadvertently even if there is any play in the caliper, and if the operator expresses his/her intention to perform the next measurement by moving the slider 5 in a predetermined manner after reading the measured value of the previous measurement, it will be particularly effective. Since the hold can be automatically released without having to make a single switch, work efficiency is also increased from this point of view.

Furthermore, since the release condition can be selectively set by the distance M1, for example, when measuring objects with the same dimensions, by reducing M, it is possible not only to reduce the so-called idle movement of the slider 2. Even when measuring objects of various dimensions, the dimensions of the last object to be measured are used as the reference distance M, so there is no need to reset the distance M1 for each task, and the scope of application can be expanded. Furthermore, the distance J M 2 can be set by taking into consideration the backlash and deflection of the caliper structure such as the slider 2, so that the bold reading of the measured value will not be automatically canceled inadvertently and reliable reading work will be possible. Become.

According to the above embodiment, distances M1 and M
I tried to set t, but M and Myo are in RAM.
, ROM, etc. may be used as a rewriting method; similarly, storage means,
It is also possible to incorporate the arithmetic control circuit and the like into a one-chip IC.

Furthermore, although we have shown the outside measurement such as the outer diameter, if we judge the block ■ and select the values and directions of the distances M, , Mz, M, etc. in the opposite direction, we can also measure the inside such as the inside diameter as shown in Figure 5. It can be applied as is. Also,
By providing an outside/inside measurement changeover switch, both can be provided.

〔Effect of the invention〕

According to this invention, it is possible to perform measurements with both jaws in optimal contact with the object to be measured, which allows for highly accurate measurements.The measured values are held and displayed, so not only can measurements be carried out quickly and stably, but the holding is automatic. Since it is released, it has the excellent advantage of dramatically improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is an external view showing an embodiment of an electronic display caliper according to the present invention, FIG. 2 is a block diagram, FIG. 3 is a flowchart explaining the operation, and FIG. 4 is a similar diagram. FIG. 5 is a diagram illustrating the relationship between the object to be measured and the caliper in another embodiment. ■... Main scale, 2... Slider, 5, 6, 7.8...
・Joe, 9, 10.11...Switch, 12...
Mode selection switch, 16... Arithmetic control circuit, 17.
...Storage means, 21...Constant setter, 22...Electronic display, 30...Encoder, W,...Measurement object.

Claims (1)

[Claims] (1) A main scale having one jaw, a slider movably attached to the main scale and having the other jaw that comes into contact with the one jaw between the measurement parts of the object to be measured, and this slider relative to the main scale. An electronic display caliper comprising: a sensor for detecting relative movement displacement; an encoder formed including a counter; and an electronic display connected to the encoder and electronically displaying a measured value. , storage means for storing, in the measuring means, the current call value read from the counter, the previous call value read every cycle, and the data obtained from the current call value and the previous call value;
When the slider moves in the direction in which the other jaw moves away from the measurement part of the object to be measured within a range not exceeding a distance M_1 from a preset reference position using the data stored in this storage means, Holding the display value of the electronic display, and holding the electronic display when the slider moves in the direction of the measurement part of the object to be measured by a distance M_2 that exceeds the distance M_1 and includes a preset zero. An arithmetic control circuit is provided which has a function to release the slider and display the current position of the slider, and to hold and display the measured value of the object to be measured in the optimum state, and also to automatically display the measured value of the object to be measured in the optimum state, and automatically before measuring the next object to be measured. An electronic display type caliper characterized by being configured so that the hold can be released.