JPH0347685B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a length measuring device, and more particularly, the present invention relates to a length measuring device, and more specifically, a length measuring instrument is used to measure a length of a measured object by bringing the measuring head of a slider movably supported by a long body into contact with the measured object. This invention relates to improvement of a length measuring device for measuring the dimensions, etc. of

[Background Art] Measuring instruments such as calipers and height gauges include those that read scales engraved on the main scale, support, etc., and so-called digital displays in which an encoder is integrated with a slider and measured values are displayed digitally. The latter type has various advantages such as being free from individual reading errors, easy to read, and easy to handle. However, such digital display type length measuring instruments have not been put to practical use, for example, a caliper with a main scale or a height gauge with a support of 1 m or more. This is because when trying to fix an optical scale or an electrostatic scale over the entire length of the main scale or support, the following problems occur.

When a long scale is used, it is difficult to manufacture a device with characteristics such as linearity constant over its entire range, and as a result, stable measured values (accurate measured values) cannot be obtained.

If a long scale is used, thermal deformation or the like will have a large effect, and once the long scale is fixed to the main scale etc., it is likely to cause deterioration in accuracy.

During measurement work, the operator's attention is concentrated only on the measuring tip, etc., so it is easy to handle the scale in a manner that may damage the other end.

[Object of the Invention] An object of the present invention is to provide a digital length measuring instrument that solves various problems when using a long scale as described above and has a long measuring range.

[Structure of the Invention] Therefore, in general measurement work, the present invention does not measure objects with widely different dimensions while exchanging them each time, but rather measures a large number of objects with roughly the same dimensions. It was created with a focus on the actual measurement work of In a length measuring instrument that measures the dimensions of a workpiece by bringing a child into contact with the workpiece, one end of a scale that extends in the direction of movement of the slider and is shorter than the elongated main body is fixed to the slider, and the length of the scale is fixed to the slider. A sub-slider is provided that is movable along the scale body and can be locked at an appropriate position, and the other end of the scale is supported by the sub-slider so as to be movable and lockable at an appropriate position. An encoder that cooperates with the scale to detect the amount of relative movement of the sub-slider with respect to the scale, and a digital display that digitally displays the detected amount of relative movement are provided.

As a result, if the sub-slider is moved to a predetermined position on the elongated main body in accordance with the dimensions of the object to be measured, and the slider is moved in a locked state, the amount of movement is equal to that of the scale and the sub-slider. The object of the present invention is to achieve the above object by detecting and digitally displaying the detected data using an encoder.

[Description of Examples] Examples of the present invention will be described below based on the drawings.

1 and 2 respectively show an embodiment in which the length measuring device according to the present invention is applied to a caliper, and in these figures, a main scale is attached to one end side of a long main scale 1 as a long main body. A slider 2 is formed on the main scale 1, and a slider 4 is supported on the main scale 1 so as to be movable and lockable at an appropriate position with a clamp screw 5. ing. The slider 4 supports one end of a scale 6 that extends along the moving direction of the slider 4 and is shorter than the main scale 1, and the other end is supported by a sub-slider 7, which is connected to the main scale 1 and the other end. The scales 6 are movably engaged with each other and are lockably engaged via clamp screws 8 and 9 as locking means. Further, a stopper 6A is provided at the other end of the scale 6, and this stopper 6A is provided at the other end of the scale 6.
A prevents the sub-slider 7 from coming off from the scale 6. For example, when moving the slider 4 to the main scale position 2 side, if you operate only the slider 4, the sub-slider 7 will also move in the same direction without operating the sub-slider 7 alone. It is starting to be moved to

As shown in FIG. 3, the sub-slider 7 is
An encoder 10 is provided which cooperates with the scale 6 to detect the amount of movement of the sub-slider 7 relative to the scale 6. Inside the encoder 10, the encoder 10 moves together with the sub-slider 7 while facing the scale 6 and corresponds to the amount of movement thereof. The detection unit 11 has a detection unit 11 that generates an output signal, and the directionality of the detection signal output from the detection unit 11 is determined by a dividing circuit 12, and then counted by a counter 13 to obtain a measured value. Measured value is displayed on digital display 1
4, it is now digitally displayed.
This digital display 14 has preset function 1.
5. A zero set function 16 and a hold function 17 are provided, and these functions 15, 16, and 17 are operated by the operating means 1.
It is designed to be operated by 8.

Next, the operation of this embodiment will be explained.

The sub-slider 7 is locked by a clamp screw 9 at an appropriate position where it can move in both directions, such as the middle part in the longitudinal direction of the scale 6, and the sub-slider 7 can be moved freely relative to the main scale 1 by loosening the clamp screw 8. Let it be. In this state, use a dimension standard such as a block gauge that approximates the dimensions of the object to be measured.
The slider 4 is moved relative to the main scale 1 so as to be sandwiched between the slider 4 and the slider 4. At this time, the sub-slider 7 moves together with the slider 4. Next, after locking the sub-slider 7 to the main scale 1 with the clamp screw 8, the clamp screw 9 is loosened so that the scale 6 and the sub-slider 7 can be moved relative to each other.
The measurement work is performed by holding the object to be measured between the two jaws 2 and 3 instead of using the dimension standard. At this time, the main scale 1, which is the elongated main body, is fixedly placed on the object to be measured via the shaft 2, and the shaft 3, which is the probe of the slider 4, is brought into contact with the object to be measured.

Here, use the dimension standard on both chairs 2 and 3.
If the value displayed on the digital display 14 when held between them is set to zero by the zero set function 16, the measured value displayed on the digital display 14 will be displayed as a comparison value with respect to the reference dimension. Also,
If the reference dimension is previously set on the digital display 14 by the preset function 15, the measured value will be displayed as an absolute value obtained by adding the set value.

According to this embodiment, even though the main scale 1 itself is long, it is not necessary to make the scale 6 also long. Therefore, unlike the case where a large scale is provided over the entire length of the main scale 1, there is no manufacturing difficulty in making properties such as linearity constant over the entire length, and there is less influence of thermal deformation. This has the effect of reducing the risk of damage during handling. Also, set scale 6 to slider 4.
Since it is also moved to various locations on the main scale 1, the same measurement accuracy can be ensured in any measurement range of the main scale 1.

In addition, since it is easy to attach the scale 6 and sub-slider 7 to an existing long caliper, it can be conveniently applied to an existing non-digital caliper and used as a digital measuring instrument. It is. Furthermore, inspection of the scale 6, etc. is easy.

Note that the present invention is applicable not only to calipers but also to height gauges, as shown in FIG. 4, for example. In this figure, the gauge head that comes into contact with the object to be measured is a scriber 21, and the elongated main body is substantially the same as the caliper described above, except that it is a long support 22 that is fixed on the surface plate together with the object to be measured. be.

Furthermore, the structure of the scale 6 and encoder 10 may be optical type, electrostatic type, electromagnetic type, etc., and the structure of the preset function 15 may also be a direct setting method using numeric buttons or an automatic setting method for displaying values within the continuous range. It may be of any type, such as a shift method or a step-stop method.

[Effects of the Invention] As described above, according to the present invention, it is possible to solve various problems when using a long scale and to provide a digital length measuring instrument having a long measuring range.

[Brief explanation of drawings]

1 and 2 are a plan view and a front view, respectively, showing an embodiment of the length measuring device according to the present invention, FIG. 3 is a block diagram showing the configuration of the sub-slider of the embodiment, and FIG. FIG. 7 is a front view showing another embodiment. 1, 22...Main scale as a long main body, support, 3,
21...Jiyou as measuring head, scriber, 6...
Scale, 6A...Stop, 7...Sub slider,
9... Clamp screw as a locking means, 10... Encoder, 14... Digital display, 15... Preset function.

Claims (1)

[Claims] 1. It has an elongated main body fixedly arranged with respect to the object to be measured, and a slider that is movable along the elongated main body, and the probe of the slider is placed on the object to be measured. In a length measuring instrument that measures the dimensions of a measured object by bringing it into contact with the object, one end of a scale extending in the direction of movement of the slider and shorter than the elongated main body is fixed to the slider, and the scale is moved along the elongated main body. A sub-slider that is movable and lockable at an appropriate position is provided, the sub-slider supports the other end of the scale in a movable and lockable manner, and the sub-slider is configured to cooperate with the scale. 1. A length measuring device comprising: an encoder that detects the amount of relative movement of a sub-slider with respect to a scale; and a digital display that digitally displays the detected amount of relative movement. 2. The length measuring device according to claim 1, wherein the digital display is equipped with a preset function for presetting a predetermined display value according to the position of the slider with respect to the elongated main body. .