JPH088408Y2 - Non-contact length measuring device - Google Patents

Description

[Detailed description of the device]

[0001]

The present invention relates to the length of an object to be measured, for example, the length of a coil or the like formed by rolling a thin steel plate into a cylindrical shape.
And a device for contactlessly measuring the center position .

[0002]

2. Description of the Related Art Conventionally, for example, as a device for measuring the length of a coil, there is a length measuring device shown in FIG. The length measuring device 20 includes a pair of racks 22, 22 toward and away movement to each other by the rack cylinder 21, a pair of touch cell down <br/> server 23 provided on the distal end of each rack 22, 22 , 23 and a pair of pulse linear generators (hereinafter simply referred to as “PLG”) 24, 24 for electrically measuring the moving distance of the pair of racks 22, 22.
And a pair of tables 25,2 with racks 22,22
5 has a table cylinder 26 which moves the coil 5 toward and away from the coil C at the same time. The PLG 24 generates a pulse in accordance with the movement of the measured object that moves linearly, and the pulse interval changes in proportion to the moving speed of the measured object. Therefore, the moving distance of the measured object can be measured by counting the number of pulses.
Also, each cylinder 21, 21, 26 is a piston rod 2
It has 7, 27, 28.

The length of the coil C is measured as follows. The table cylinder 26 is a pair of tables 2
5 and 25 are retracted to the standby position in advance. Further, the rack cylinder 21, 21 is separated a pair of racks 22, 22, extend the pair of touch sensors 23 and 23 at predetermined intervals, allowed to stand at the origin position. When the coil C is sent, the table cylinder 26 moves to the pair of tables 2
5,25 was close to the coil C, to face the pair of touch sensors 23 and 23 at both ends of the coil C. Thereafter, by operating the rack cylinder 21, the touch sensors 23
To the coil C. During this time, the PLG 24 generates the number of pulses according to the moving distance of the rack 22, and the moving distance of the rack 22 is measured by the distance measuring circuit (not shown). A pair of touch at the origin position sensors 2
Since the intervals of 3,23 are set to some known value,
The length of the coil C is calculated from the moving distance of the rack 22.

[0004]

However, such a length measuring device has the following problems. (1) Since the touch sensors 23 contacts the end of the coil C, scratched coil C, unless, in the case of a coil wound a steel sheet high quality may not be able to use. (2) Since many cylinders 21, 21, 26 are used, the structure is complicated. (3) Since if the table 25 is moved between the standby position and the measured position sensors can not measure the length of the coil C, it is necessary to widen the space.

[0005]

SUMMARY OF THE INVENTION The present invention is a pinion,
A pair of racks that mesh with each other on both sides of the pinion and move in opposite directions, a rodless cylinder that moves one of the pair of racks, and a pair that is provided on each of the pair of racks and that detects the end of the object to be measured. of the photo sensors, and rotation of the pair of actuated by the photo sensors of the pair of photo-cell the measured object from the moving distance of the Nsa length distance measuring means and said pair of calculating the said pinion
Distance between the center of the photo sensor and the center of the DUT
Calculating means for calculating from the distance measured by the pair of sensors
And the sensor operation detection time to determine the one side of the deviation.
The object to be measured from the waiting position of the carriage for loading the object to be measured.
Truck stop position setting circuit that calculates the distance traveled to the center of
The above-mentioned problems are solved by a device including

[0006]

The length of the object to be measured is measured as follows. Rodless cylinder is separated a pair of racks, spread a pair of photo-sensors at predetermined intervals and allowed to stand at the origin position. When the DUT is sent, the rodless cylinder moves one rack. The other rack is moved in the opposite direction to the one rack by the pinion that is rotated by the movement of the one rack.
That is, the pair of racks move closer to each other. At the same time, the pinion activates the distance measuring means. Thus, when the pair of racks are moved closer to each other, the photo cell down <br/> Sir is also allowed to approach each other. During this approach, the photo sensor detects the edge of the measured object. Distance measuring means, the photo sensors measures the distance from the origin position to a position detecting the end of the measured object, and the distance that the measurement, the object to be measured from the distance between the pair of photo sensors at the origin position Calculate the length of.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The length measuring device 30 is a device for measuring and detecting the length of the coil C formed by winding a thin steel plate into a cylindrical shape and the center position of the coil C in the axial direction, and the coil C is temporarily placed. It is installed beside the fixed coil stand 31. A dolly 33 enters and exits below the coil stand 31. The cart 33 is a coil loading platform 3 that can be raised and lowered.
It has 2 and is designed to run on a pair of rails R, R. The length measuring device 30 includes a pinion 40,
A pair of first and second racks 411 and 412 that mesh with both sides of the pinion 40 and move in opposite directions, and the first rack 4
11 and rodless cylinder 42 for moving the first to detect a first, end portion of the coil C respectively provided in the second rack 411, 412, second photo sensors 431,43
2, the rotation and the first pinion 40, the first operated by the second photo sensor <br/> over 431, the moving distance of the second photo cell down <br/> Sir 431 of the coil C Distance measuring means 44 for calculating the length.

A frame 50 (see FIG. 6) of the length measuring device 30 has a U-shaped cross section, and a horizontal plate 51 (see FIG. 4) is provided at an intermediate portion. The opening of the frame 50 is covered with a mountain-shaped cover 52 (see FIG. 6) made of transparent plastic. Frame 50
Origin sensors 53 at the left end (see FIG. 4) for setting the movement origin of the first rack 411, in the vicinity of the horizontal plate 51 first
Endpoint sensors 54 to set the moving end point of the rack 411 are equipped respectively. The horizontal plate 51 has a first and a second
A large-diameter roller 55 and a pair of small-diameter rollers 56, 56 for guiding the back surface (the surface opposite to the teeth of the rack) and both side surfaces of the racks 411, 412 (see FIGS. 7 and 8) are provided. . The pinion 40 (see FIG. 7) is a frame 50.
It is provided on a shaft 57 which is vertically rotatably provided on the horizontal plate 51.

The first rack 411 (see FIGS. 4 and 5) is
It is attached to the first moving frame 601 and meshes with the pinion 40. The first moving frame 601 is attached to a movable body (not shown) of the rodless cylinder 42 and moves on the rodless cylinder 42. The rodless cylinder 42 is a known cylinder that does not have a piston rod, and has a movable body (not shown) that reciprocates in the cylinder by air, magnetic force, wires, or the like. A cylinder device having a piston rod that has been generally used in the past requires an installation space that is about twice the length of the cylinder because the piston rod moves in and out of the cylinder. Since it does not move inside the cylinder and move in and out like a piston rod, it has the advantage that the installation space is approximately the length of the cylinder. The second rack 412 meshes with the pinion 40, and a moving body 62 of a known linear motion bearing 61 provided on the frame 50.
(See FIG. 5). The moving body 62 is the rail 6
It is possible to move back and forth on 3 straight lines.

The distance measuring means 44 (see FIG. 9) includes a pulse linear generator 70 and a count calculation circuit 71.
And a sensor operation detection circuit 72 and a bogie stop position setting circuit 73. The PLG 70 is provided on the horizontal plate 51, and is connected to the shaft 57 provided with the pinion 40. The count calculation circuit 71 is a circuit that counts the pulses sent from the PLG 70 and calculates the movement distance of the photosensor. Sensor operation detection circuit 72, a pair of photo sensors 431 and 432 detects either of the photo sensors is activated earlier, a circuit for informing this to the carriage stop position setting circuit 73. The dolly stop position setting circuit 73 is a circuit for calculating and calculating the length and center position of the coil C based on each distance calculated by the count calculating circuit 71.

[0011] The photo-sensors 431 and 432 is a Retro-reflective photocell with MSR function. This retroreflective phototube has a horizontal polarization filter on the light-projecting side and a vertical polarization filter on the light-receiving side.It emits only transverse-wave light and receives only longitudinal-wave light. ing. Photo sensors 431 and 432 and the regressive reflection plate 74 to the opposite position (see FIGS. 1 and 2) is provided. The retroreflective plate 74 has a large number of triangular pyramid-shaped “dents” formed on the surface thereof, and has a function of converting a transverse wave emitted by a retroreflective phototube into a longitudinal wave and reflecting it. Therefore, photo sensors 431 and 432 is adapted to receive only when light of their emitted transverse wave is reflected is converted into light of a longitudinal wave by the regressive reflection plate 74, the measured object is interposed within the When the light is blocked, the light cannot be received, and even when the light reflected by the glossy object to be measured is received, the light is a transverse wave and is not received. Such a function is called an MSR (mirror surface rejection) function. The first,
The second photosensors 431 and 432 are respectively provided in two pieces (see FIG. 4).
This is so that different coils C can be simultaneously measured on both sides of 0.

Next, the operation will be described. First photo sensors 431, waiting is moved by the first rack 411 to a position opposed to the origin sensors 53. Second photo sensors 432, when the first rack 411 is moved, waiting farthest from the first photo-sensors 431 by a second rack 412 is moved in the opposite direction by the pinion 40. First photo at this time
And sensors 431 a distance L between the second photo sensors 432 (see FIG. 1) is a distance set in advance, the center line CL of the straight line length measuring device through the midpoint of the distance L
Is. Further, the center line CL, the waiting position of the carriage 33, and the distance LD are also preset.

[0013] coil C is conveyed by a crane (not shown), when it is stacked on the coil table 31, rodless cylinder 42, the first photo-sensors 431 one of the coil C to move the first rack 411 Close to the end C1. Further, the first rack 411 moves the second rack 412 via the pinion 40 along with the movement of the second photo.
The sensors 432 are brought close to the other end C2 of the coil C. Accordingly, first, second photo sensors 431 and 432
Will move closer to each other. The pinion 40 also operates the PLG 70 as the pinion 40 rotates. The PLG 70 generates a pulse, and the count calculation circuit sequentially counts the pulse.

[0014] The first, second photo sensors 431 and 432
One of the photo sensors of the light of the first photo-sensors 431 is blocked by the one end portion C1 of the coil C in FIG. 1, the first photo-sensors 431 one end C1 of the coil C Detect. At the same time sensors operating detection circuit 7
2, the first photo sensors 431 second photosensor 432 carriage stop position setting that has been activated before the circuit 7
Report to 3 . Then, the count operation circuit 71 is the first photo sensors 4 on the basis of the number of pulses counted up to that
The moving distance L1 of 31 is calculated.

[0015] The pair of photo sensors 431 and 432,
Still close move together, the second photo sensors 432 detects the other end C2 of the coil C. Then, the count operation circuit 71 calculates the movement distance L2 of the second photo sensors 432 based on the number of pulses counted until then.

The carriage stop position setting circuit 73, a distance L between the initial positions of the pair of photo-sensors which is set in advance,
The length of the coil C (LC = L-L1-L2) is calculated based on the distances L1 and L2 obtained by the count calculation circuit 71. Further, the same circuit 73 calculates [(L1 + L2) / 2] to obtain the deviation distance LS between the center CL of the length measuring device and the center CCL of the coil C, and the distance from the carriage standby position to the center of the coil C ( LD + LS) is calculated.

[0017] At this time, whether central CCL coil C are shifted in FIG. 1 in the vertical either side relative to the center CL of the length measuring apparatus, photo sensors that initially actuated being informed by sensors operating detection circuit 71 It is judged that it is shifted to the side. That is, in the case of FIG. 1, since the first photo sensor 431 is operated first, the center of the coil C is deviated to the upper end side of FIG. The distance is (LD + LS)
Is calculated as If the second photo sensor 432 first operates, the center of the coil C is displaced to the lower end side of FIG. 1, and the distance from the carriage standby position to the center of the coil C is (LD-LS ) Is calculated as.

Finally, the trolley stop position setting circuit 73 sends a distance signal from the trolley standby position to the center of the coil C to a trolley control circuit (not shown), and the center of the trolley 33 is moved to the coil C.
The carriage 33 is stopped at the center of the carriage. During this time, the pair of photo-sensors are moved up to the end point sensors 54 (FIG. 4, the position of FIG. 5), then returns to the initial standby position. As described above, since the photosensors 431 and 432 are retroreflective phototubes with MSR function, when the coil C is detected, even if light is reflected by the coil C, malfunction may occur. Therefore, the end of the coil C can be reliably detected.

[0019]

The non-contact length measuring device of the present invention has the following effects. (1) Due to the use of photo-sensors, can be detected in a non-contact end of the object to be measured, without such damage the object to be measured, there by the measurement of high-quality Even the length can be measured. (2) Due to the use of photo sensors, each time measuring the length of the object to be measured, even without and out the sensors in the transport path of the object to be measured to measure the length of the object to be measured Therefore, the structure of the entire length measuring device can be simplified. (3) because it has a rodless cylinder, a pinion for moving the pair of photo-sensors, it is not necessary to use a large number of cylinders which have conventionally been required, can be simplified structure. (4) Measuring means for the object to be measured by a pair of photosensors
And the sensor operation detection circuit
You can move the loading dolly towards you and stop it
On the object to be measured (coil) stand on which the carriage can be raised and lowered.
Since the center of the measured object can be mounted, it has a large weight like a coil.
The object to be measured can be transported safely and securely without tipping over
Can be sent.

[Brief description of drawings]

FIG. 1 is a schematic plan view of the length measuring device of the present invention used as a coil length measuring device.

FIG. 2 is a plan view when the length measuring device is used as a coil length measuring device.

FIG. 3 is a diagram of FIG. 2 viewed from the front side.

FIG. 4 is a plan view of the length measuring device, which is a state diagram after measuring the length of the coil.

FIG. 5 is a front view of the length measuring device.

FIG. 6 is a left side view of FIG.

FIG. 7 is a cross-sectional view taken along the line 7-7 in FIG. 4, with a part omitted.

FIG. 8 is a plan view of the vicinity of a linear pulse generator, showing a state in which a pinion and a rack are in mesh with each other by cutting a part thereof.

FIG. 9 is a circuit diagram of distance measuring means.

FIG. 10 is a schematic perspective view of a conventional distance measuring device.

[Explanation of symbols]

C coil 30 length measuring device 40 the pinion 411 rack 42 rodless cylinder 431 Photo sensors

Claims (1)

[Scope of utility model registration request] 1. A pinion, a pair of racks that mesh with both sides of the pinion and move in opposite directions, a rodless cylinder that moves one of the pair of racks, and a pair of racks to be measured. distance measurement to calculate a pair of photo sensors for detecting the end of the object, the length of the measured object from the moving distance of the pair of photo-sensors actuated rotated by the pair of photo sensors of the pinion Between the means and the pair of photosensors and the measured
The distance of the deviation of the center of the object is measured by the pair of sensors.
The calculation means calculated from the moving distance and the deviation side of the deviation
The sensor operation detection circuit that distinguishes between the
Calculate the distance traveled from the standby position to the center of the DUT
Non-contact length measuring device having a trolley stop position setting circuit .