JPH058482Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an optical dimension measuring device that measures the dimensions of a material to be measured that crosses the optical path of the detection unit, and more specifically, The present invention relates to a height adjustment device that allows the height of the material to approximately match the height of the center of the material to be measured.

Prior Art Optical dimension measuring devices use an optical device that includes a lens as a main part in its detection section, but lenses have spherical aberrations, distortion, etc., and it is impossible to completely eliminate these aberrations. Therefore, it is not possible to form a distortion-free image on the sensor. Since the distortion increases toward the periphery, the error associated with measurement increases as the center of the material to be measured moves away from the optical axis of the detection section. In order to minimize errors, generally the positional relationship between the material to be measured and the detection unit is adjusted to align the center of the material to be measured with the optical axis.There are two ways to do this, one is One method is to move the material to be measured, and the other is to move the detection unit. However, since the method of moving the material to be measured has many mechanical difficulties, a method of moving the detecting section is adopted.

Problems that the invention aims to solve There are two types of elevating devices that move the detection part: active and electric. The alignment is done visually. Therefore, it is necessary to look into the optical path of the detection unit from the horizontal direction, but depending on the mounting position of the detection unit, it may be obstructed by the protruding part of the mechanical device and it may not be possible to look into the optical path.
There were cases where adjustments were unavoidably made by looking diagonally from above, resulting in inaccurate adjustments. Moreover, manual labor is essential for the adjustment.

This invention was devised to solve the above-mentioned problems associated with visual inspection, and its purpose is to provide a height adjustment device that can automatically align the optical axis of the detection unit with the center of the material to be measured. It is about providing.

Means for Solving the Problems In order to achieve the above object, the height adjustment device of the present invention is provided in such a way that the object to be measured, which is supported by the object-to-be-measured support part and has a long rod-like outer shape, moves along its longitudinal direction. When the object to be measured crosses the optical path of the detection section, it is applied to an optical dimension measuring device whose dimensions are measured by the detection section, supports the detection section, and moves the supported detection section in the vertical direction. A lifting device for moving, a setting section into which a reference value of the dimension of the material to be measured is input, and a movement amount conversion section for calculating the vertical movement amount of the lifting device based on the reference value input into the setting section. , and a control unit that controls the vertical movement of the lifting device according to the movement amount calculated by the movement amount conversion unit, and the center of the material to be measured and the optical axis of the optical path are approximately the same. The height shall be the same.

Operation When starting the measurement of a new material to be measured, a value serving as a standard for the dimensions of the material to be measured is inputted using the setting section. The movement amount conversion section calculates the amount of movement necessary to make the height of the optical axis of the detection section approximately match the height of the center of the material to be measured, according to the output from this setting section, and sends it to the control section. do. The control section operates the lifting device to change the height of the detection section, so that the height of the center of the material to be measured substantially matches the height of the optical axis.

Embodiment FIG. 1 is a front view schematically showing an embodiment of the present invention.

In the figure, the detection unit 12 of the optical dimension measuring device
is a pair of support plates 131 that support near both ends thereof.
It is fixed to a rectangular base 132 by. This base 132 is moved by the lifting shaft 140 of each of the four screw jacks 133 (the two screw jacks are not shown because they are located at the back of the drawn screw jack). The detection unit 12 is supported at its four corners and can be moved up and down.

The output of the geared motor 138 is transmitted via a coupling 137 to a gearbox 139b that transmits rotational force to a screw jack 133b, and further transmitted to a gearbox 139a via two couplings 135 and an extension shaft 136. These gearboxes 139a, 139b
is configured to transmit the output of the geared motor 138 also to a screw jack (not shown), and the four lifting shafts 140 are configured so that the amount of movement thereof is equal. The elevating device 13 is constituted by elements numbered 131 to 140 in the figure.

Extension shaft 136 connecting two coupling rings 135
A pulse disk 151 is attached to the center of the rotary encoder, and is combined with a photo interrupter 152 to form a rotary encoder.

FIG. 2 is a block diagram showing the electrical connections including the rotary encoder and geared motor 138.

It is shared with the numeric keys on the operation panel (not shown) provided on the main body of the optical dimension measuring device,
A setting section 16 into which a reference value of the outer diameter of a long, round bar-shaped material to be measured is inputted, sends the inputted value to a movement amount conversion section 17 . The movement amount conversion unit 17 is configured as software,
The amount of movement of the detection unit 12 attached to the lifting device 13 in the vertical direction is calculated (described in detail later), and an output indicating the amount of movement is sent to the motor drive unit 153. The control unit 15 controls the pulse disk 1
51 and a photo interrupter 152, and a motor drive section 153, and the motor drive section 153 sends a drive output to the geared motor 138.

As shown in FIG. 1, the material to be measured 11a or 11b is conveyed by a conveying roller 1 which is a supporting part of the material to be measured.
11 while crossing the optical path of the detection unit 12, and at this time the dimensions are measured.

FIG. 3 is an explanatory diagram showing the relationship between the reference dimensions and the center height of the material to be measured 11.

The conveyance roller 111 shown in FIG. 3 has a drum-like shape in which a pair of cones with their tips cut off are joined with their cut surfaces facing each other, and the angle θ at which their circumferential surfaces intersect is 120 degrees. It is becoming.
The upper position of the narrowest part of the transport roller 111 is the logical center position when the reference dimension of the material to be measured is 0, and the following description will be made with this position 33 as the reference point.

FIG. 4 is an explanatory diagram showing the positional relationship between the reference point 33 and the center of the material to be measured.

The center of the material 11 to be measured is set to O, and the leg of the perpendicular line drawn down to the straight line D is set to E. When the position indicating the reference point is F, the length of OF indicates the height h of the center of the material to be measured 11, and the length of OE indicates the radius of the material to be measured 11. If the radius is r, the angle α is 60 degrees, so h/r=2/√3 In other words, if the diameter of the material to be measured 11 is d, the height h of the center is h=2×r/√3=d /√3.

The operation of the device according to the present invention will be explained below.

In FIG. 1, since the measurement of the material to be measured 11b is being performed, the height of the center 112b of the material to be measured 11b and the height of the optical axis 121 of the detection unit 12 are adjusted by the lifting device 13. ing.
When measuring the material to be measured 11a from this state, the center 112b of the material to be measured 11b is aligned with the optical axis 121.
need to match. Note that since FIG. 1 is a schematic diagram, the positional relationship and size ratio between the conveying roller 111 and the material to be measured 11 shown in FIG. 3 are not the same.

The reference dimensions of the material to be measured 11a are input from the setting section 16. Then, the movement amount conversion unit 17 calculates the height 31a shown in FIG. 3, and calculates the movement amount 32 based on the height 31b for the material to be measured 11b. If this amount of movement is I, then from Fig. 4 I = 31a-31b = a/√3-b/√3 = (a-b)/√3 (where a is the diameter of the material to be measured 11a and b is the (indicates the diameter of the measuring material 11b).

This value I is sent to the motor drive section 153. Then, the motor drive unit 153 rotates the geared motor 138, and the photo interrupter 1
The pulse from 52 is measured. The screw jack 133 is rotated by a geared motor 138 via a gear box 139, and the elevator shaft 1
40 is rising. And the optical axis 1 of the detection unit 12
21 reaches a height that matches the center 112a of the material to be measured 11a, this means that the motor drive unit 15
3, the motor drive section 153 stops driving the geared motor 138.

Note that the present invention is not limited to the above embodiment, and if a stepping motor is used instead of the geared motor 138, open loop control will be achieved, so it is possible to omit the rotary encoder from the control unit 15. .

Moreover, although the conveyance roller 111 has been described in the case of a drum-shaped case, it is possible to apply the present invention similarly to a conveyance roller having other shapes, for example, a cylindrical shape.

Effects of the invention The height adjustment device according to the invention inputs the reference value of the dimension of the material to be measured through the setting section, and also inputs the reference value of the dimension of the material to be measured through the setting section, and also inputs the reference value of the dimension of the material to be measured using the setting section, and according to the value calculated by the movement amount conversion section based on the input value, Since the detection unit is configured to move vertically using a lifting device, the detection unit moves simply by inputting the reference dimensions, allowing the optical axis of the detection unit to automatically align with the center of the material to be measured. is now possible.

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing an embodiment of the present invention, Fig. 2 is a block diagram showing electrical connections including a rotary encoder and a geared motor, and Fig. 3 is a diagram showing the reference dimensions and center of the material to be measured. FIG. 4 is an explanatory diagram showing the relationship with height, and FIG. 4 is an explanatory diagram showing the positional relationship between the reference point and the center of the material to be measured. 11... Material to be measured, 12... Detection section, 13...
Lifting device, 15...control unit, 16...setting unit, 1
7...Movement amount conversion section, 111...Measurement material support section.

Claims (1)

[Claims for Utility Model Registration] When a material to be measured, which is supported by a material to be measured supporting part and has a long external shape, crosses the optical path of the detection unit while moving along its longitudinal direction, the material to be measured is An optical dimension measuring device in which a dimension is measured by the detection section, further comprising: an elevating device that supports the detection section and moves the supported detection section in a vertical direction; and a reference value for the dimension of the material to be measured. a setting section into which is input; a movement amount conversion section that calculates the vertical movement amount of the lifting device based on the reference value input to this setting section; a control section that controls vertical movement of the elevating device according to an amount of the object to be measured, the height adjusting device comprising: a control section that controls vertical movement of the elevating device according to an amount of the object;