JP2017049019A - Long-sized material length measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-sized material length measuring apparatus capable of measuring highly accurately a length of a long-sized material having various lengths.SOLUTION: A long-sized material length measuring apparatus includes first and second sensors 11, 41 arranged on the upstream side and a downstream side of a conveyance path C of the long-sized material, for detecting existence of the long-sized material, and travel measuring means 31 installed between the first and second sensors 11, 41, for measuring a travel X1-X3 of the long-sized material in a prescribed time, and further includes guide means 21 for guiding, while suppressing vibration of the long-sized material, in the vicinity of the upstream side of the travel measuring means 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a long material length measuring device, and more particularly to a long material length measuring device capable of measuring a length with high accuracy even for long materials having different lengths.

  Conventionally, a long material length measuring device for measuring the length of a long C-shaped steel material on-line has been used. As an example of the long material length measuring device, a touch roller that moves forward and backward by the operation of an actuator is provided on one side of the conveyor, and a device main body provided with a pulse generator that detects the number of rotations, and a steel material that moves on the conveyor Including a photoelectric switch that detects the upstream and downstream sides of the apparatus main body, and a timer that causes the actuator to advance after a predetermined time when the upstream photoelectric switch detects that the tip of the steel material has been reached. was there. And the pulse generator from the time when it was detected that the front end of the steel material passed by the interval between both photoelectric switches and the downstream photoelectric switch to the time that the rear end of the steel material was detected by the upstream photoelectric switch The length of the steel material is obtained by calculation from the driven rotation speed of the touch roller detected by the above (see Patent Document 1).

  As another example of the long material length measuring device, the basic configuration is the same as that of Patent Document 1, but the number of sensors for detecting the presence or absence of steel material is increased to increase the measurement accuracy by calculation. (See Patent Document 2 and Patent Document 3).

Japanese Patent Laid-Open No. 7-71921 JP 2005-214906 A Japanese Patent Laid-Open No. 10-47947

However, the long material length measuring device according to the above prior art document has the following problems for structural reasons.
(1) The measurement accuracy is poor.
(2) The device configuration is complicated.

  The reason for each of the above problems will be described below. First, although the measurement accuracy of (1) is bad, the long material length measuring device of Patent Document 1 is not provided with a guide for guiding the steel material when transporting the steel material, and the touch roller is not provided. It is a structure that contacts the side of the steel material. For this reason, the touch roller moves away from the steel material due to the vibration of the steel material accompanying the conveyance, thereby degrading the measurement accuracy. Moreover, the point that the apparatus configuration of (2) becomes complicated is that a large number of detection sensors must be provided according to the length of the long material, and not only the detection sensors but also the wiring facilities accompanying this increase. Become. In addition, the system configuration for processing data output from a large number of sensors becomes complicated.

  In view of the above problems, according to one aspect of the present invention, there is provided a long material length measuring device that can measure the lengths of long materials having different lengths with a simple structure.

  In view of the above problems, the first means includes first and second sensors that are arranged on the upstream side and the downstream side of the long material conveyance path to detect the presence or absence of the long material, and the first and second sensors. And a movement amount measuring means installed between the sensors for measuring the movement amount of the long material within a predetermined time, and guiding near the upstream side of the movement amount measuring means while suppressing the vibration of the long material. It is configured to have guide means. With such a configuration, in the movement amount measurement means, the vibration of the long material is suppressed by the guide means, and the movement amount measurement with high accuracy can be performed.

  In the second means, in addition to the configuration of the first means, the predetermined time is from when the second sensor detects the leading edge of the long material until the first sensor detects the trailing edge of the long material. It is a structure that is the time of. With such a configuration, the length of the long material can be easily calculated by adding the movement amount to the distance between the first sensor and the second sensor.

  In addition to the configuration of the first or second unit, the third unit adopts a configuration in which the guide unit includes a guide roller that contacts from both sides in the width direction of the long material. With such a configuration, the guide roller firmly holds the long material and effectively suppresses vibration.

  In the fourth means, in addition to the configuration of any one of the first to third means, two sets of guide rollers are provided, and the first set of guide rollers and the second set of guide rollers are long at different timings. It is configured to be in contact with the scale material. With such a configuration, the first set of guide rollers can be brought into contact with the long material only when necessary.

  In the fifth means, in addition to the structure of any one of the first to fourth means, the guide roller contacts the long material at least when the movement amount measuring means measures the movement amount of the long material. , Is adopted. With such a configuration, it is possible to improve the measurement accuracy during movement amount measurement.

  In addition to the configuration of any one of the first to fifth means, the sixth means includes a moving amount measuring means that places the long material between the measuring roller rotating in contact with the long material and the measuring roller. It has a configuration in which an auxiliary roller arranged to be held is provided. With such a configuration, the measurement roller and the auxiliary roller firmly sandwich the long material, so that the slip between the measurement roller and the long material is minimized, and the measurement accuracy is improved.

  The seventh means adopts a configuration in which the movement amount measuring means includes a rotary encoder that counts the number of rotations of the measuring roller in addition to any one of the first to sixth means. With such a configuration, it is possible to accurately measure the movement amount with a rotary encoder having a large resolution.

  The eighth means adopts a structure in which an actuator for moving the auxiliary roller close to and away from the measuring roller is further provided in addition to any of the structures of the first to seventh means. With such a configuration, the auxiliary roller can be brought into contact with the long material only when necessary, and the others can be separated from the long material.

  In the ninth means, in addition to any one of the first to eighth means, the measurement roller and the auxiliary roller are supported by a predetermined rail extending in the vertical direction, and measure the amount of movement of the long material. It is possible to move vertically when moving. With such a configuration, even when the long material is warped or bent, the measurement roller and the auxiliary roller follow the warp or the bent and always contact the long material. For this reason, no slip occurs between the measuring roller and the long material, and an accurate length measurement is possible.

  The tenth means adopts a configuration in which, in addition to any one of the first to ninth means, another guide means is provided in the vicinity of the downstream side of the movement amount measuring means. With such a configuration, it becomes possible to further suppress the vibration of the long material, and the accuracy of length measurement is further improved.

  The eleventh means is a long one based on the mutual distance D between the first sensor and the second sensor and the movement amount X from the movement amount measurement means, in addition to any one of the first to tenth means. An arithmetic means for calculating the length of the material is further provided, and the arithmetic means is an error coefficient proportional to the measured movement amount X, and is a measure coefficient M obtained by an error averaging process with respect to the movement amount X. In addition, a configuration is adopted in which a calculation function for calculating the length L of the long material by an equation L = D + M × X + E by an error E unrelated to the movement amount X is employed. With such a configuration, even when long materials having different lengths are measured, the measurement error can be greatly reduced by the correction.

  According to the present invention, the guide means arranged in the vicinity of the movement amount measuring means can effectively suppress the vibration of the long material and accurately measure the movement amount of the long material. Further, since appropriate correction is possible regardless of the length of the long material, the lengths of the long materials of various lengths can be measured with the same accuracy.

FIG. 1A is a schematic plan view of a long material length measuring apparatus according to this embodiment, and FIG. 1B is a schematic front view. FIG. 2 is a perspective view of the guide means of this embodiment. 3 (A) is a schematic plan view of the guide means disclosed in FIG. 2, FIG. 3 (B) is a schematic left side view, FIG. 3 (C) is a schematic front view, and FIG. Is a schematic right side view. FIG. 4 (A) is a schematic left side view of the movement amount measuring means, and FIG. 4 (B) is a schematic front view.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[Overview]
Based on FIG. 1 (A) and (B), the whole outline | summary of the long material length measuring apparatus 1 which concerns on this embodiment is demonstrated. The long material length measuring device 1 is installed on the downstream side of the long material conveyance path C when viewed from the cutting device 100. The cutting device 100 cuts a long material into a predetermined length. The long material length measuring device 1 includes a first sensor 11, a guide unit 21, a movement amount measuring unit 31, and a second sensor 41 in order from the cutting device 100 side. Along with the long material length measuring apparatus 1, a plurality of transport rollers 13 are provided along the long material transport path C. Furthermore, the guide means 21 of this embodiment includes guide rollers 211 and 213. Hereinafter, each component will be described in detail.

[First sensor]
The first sensor 11 is a laser sensor provided so as to sandwich the conveyance path C. That is, the laser light emitting unit 11a is provided on one side in the width direction of the conveyance path C, and the laser light receiving unit 11b is provided on the other side of the conveyance path C. When there is no long material in the conveyance path C, the laser light from the laser light emitting unit 11a reaches the laser light receiving unit 11b, and accordingly, a signal indicating that there is no long material (eg, an ON signal). Can be output. On the other hand, when a long material is present in the conveyance path C, the laser light is blocked, so that the laser light receiving unit 11b cannot receive the laser light. Thereby, a signal (for example, an off signal) that a long material exists can be output. The first sensor 11 is not limited to a laser sensor as long as it can accurately measure the presence or absence of a long material. For example, a long material may be photographed with a camera, and the presence or absence of the long material may be detected by image processing.

[Guide means]
The guide means 21 is shown in FIGS. 2 and 3A, 3B, 3C, and 3D. The guide means 21 is provided with guide rollers 211 and 213 for preventing the long material being conveyed from vibrating due to the guide rollers 211 and 213 sandwiching the long material from the left and right sides. The reason for preventing the vibration is that a movement amount measuring means 31 (see FIG. 1) is provided on the downstream side adjacent to the guide means 21, and the vibration adversely affects the measurement by the movement amount measuring means 31. is there. The guide means 21 is arranged on the upstream side of the conveyance path C to guide the long material, and the upstream guide roller 211 is arranged on the downstream side of the conveyance path C to guide the long material. It has. That is, a total of four guide rollers 211 and 213 are provided. However, the number of guide rollers is not particularly limited.

  The two upstream guide rollers (first set of guide rollers) 211 are rotatably supported on a rectangular parallelepiped upstream slider 215. Each upstream slider 215 is formed with a female screw in a direction perpendicular to the conveyance path C. An upstream long screw 217 is screwed into the female screw. At this time, a reverse screw is screwed to one upstream slider 215 and the other upstream slider 215. This is because each upstream slider 215 is moved in the opposite direction by rotating the upstream long screw 217 in a predetermined direction. Thereby, according to the width | variety of the elongate material to convey, the mutual distance of the two upstream guide rollers 211 can be changed. An upstream servo motor 223 fixed to the upstream bracket 221 is attached to one end of the upstream long screw 217 via a speed reducer 219. The upstream long screw 217 can be rotated by the upstream servomotor 223.

  An upstream support base 225 is provided below the upstream slider 215, and the upstream slider 215 slides on the upstream support base 225. Further, an upstream base 227 is disposed under the upstream support base 225. The upstream guide roller 211, the upstream slider 215, and the upstream long screw 217 can move together on the upstream base 227. An upstream center screw 229 is rotatably attached to the upstream base 227. The upstream side center screw 229 is for moving the upstream side base 227 in a direction perpendicular to the conveyance path C to bring out the center of the upstream guide roller 211 with respect to the conveyance path C. Therefore, the upstream center screw 229 is screwed into a female screw formed in the upstream block 231 on the upstream base 227, and a hexagonal head 233 is formed at the tip of the upstream center screw 229. Has been. By rotating the hexagonal head 233 with a spanner or the like, the position of the upstream support base 225 can be finely adjusted.

  Each of the two downstream guide rollers (second set of guide rollers) 213 is rotatably attached to the swing arm 235. The swing arm 235 rotates around a predetermined fulcrum 237. The distance between the fulcrums 237 is set larger than the maximum width of the long material to be conveyed. Female thread blocks 239 each having a female thread are attached to the two swing arms 235. A downstream long screw 241 is screwed into the female screw. At this time, a reverse screw is screwed into one female screw block 239 and the other female screw block 239. This is because each female screw block 239 is moved in the opposite direction by rotating the downstream long screw 241 in a predetermined direction. Accordingly, the two swing arms 235 swing, and the distance between the two downstream guide rollers 213 can be changed according to the width of the long material to be conveyed. A downstream servo motor 247 fixed to the downstream bracket 245 is attached to one end of the downstream long screw 241 via a speed reducer 243. The downstream long screw 241 can be rotated by the downstream servomotor 247.

  The other end of the downstream long screw 241 is rotatably supported by an L-shaped support bracket 249. And, under the support bracket 249, a downstream side [support platform 250 is provided. Further, a downstream base 251 is provided below the downstream support base 250, and the downstream support base 250 slides on the downstream base 251. A downstream center screw 253 is rotatably attached to the downstream support base 250. The downstream center screw 253 is for moving the downstream support base 250 in a direction perpendicular to the conveyance path C so as to project the center of the downstream guide roller 213 with respect to the conveyance path C. For this reason, the downstream center screw 253 is screwed into a female screw formed on the downstream block 255 on the downstream base 251, and a hexagonal head 257 is formed at the tip of the downstream center screw 253. Has been. The position of the support bracket 247 can be finely adjusted by rotating the hexagonal head 257 with a spanner or the like.

  In the present embodiment, the guide means 21 is provided on the upstream side of the movement amount measuring means 31, but the present invention is not limited to this. Another guide unit may be provided on the downstream side of the movement amount measuring unit 31 to further reduce the vibration of the long material. Further, not only the guide means 21 using a roller, but also a structure in which a long material is guided by two parallel plate members arranged along the conveyance path C may be used. In this case, the distance between the two plate members may be adjusted according to the width of the long material.

[Movement measuring means]
The moving amount measuring means 31 can measure the moving amount of the long material by rotating the measuring roller 333 in contact with the moving long material P. Here, the movement amount refers to the movement amount (measurement amount) of the long material measured by the measuring roller 333, and does not indicate the actual movement amount of the long material in a strict sense. This is because an error described later may occur in the measurement of the movement amount by the measurement roller 333. The specific structure is shown in FIGS. 4 (A) and 4 (B). The movement amount measuring means 31 includes a lower unit 33, an upper unit 35, and an air cylinder unit 37 as an actuator, and the lower unit 33 and the upper unit 35 are supported by two rails 39 extending in the vertical direction. . The lower unit 33 and the upper unit 35 can move in the vertical direction along the rail 39.

  The lower unit 33 includes a lower unit main body 331, a measuring roller 333, a lower rotating shaft 335 that supports the measuring roller 333, a lower bearing 337 that rotatably supports the lower rotating shaft 335, and a lower rotating shaft 335. A rotary encoder 339 capable of detecting the rotation speed is provided. The lower unit main body 331 is substantially T-shaped when viewed from the front, and both left and right ends thereof are supported by the rail 39. A through hole is formed in the center of the lower unit main body 331, and a lower bearing 337 is mounted in the through hole. The lower rotary shaft 335 is supported by the lower bearing 337, and a measuring roller 333 is attached to one end thereof. The measuring roller 333 of this embodiment is made of metal, and has a circumference of 300 mm as an example. For this reason, when the measurement roller 333 rotates once, the long material has moved by 300 mm.

  Further, the lower rotary shaft 335 is connected to the rotary encoder 339 via a predetermined coupling 341 so that no play occurs between the lower rotary shaft 335 and the rotary encoder 339. A collar 343 is fixed to the lower end portion of each rail 39, and a predetermined lower compression spring 345 is disposed between the collar 343 and the lower unit main body 331. For this reason, the lower unit 33 is always provided with an upward spring force. This is to ensure that the measurement roller 333 continues to contact the long material even when the long material moves up and down due to warping or bending of the long material. In the present embodiment, the lower compression spring 345 is provided on each of the two rails 39, but the lower compression spring 345 may be provided only on one rail 39.

  The upper unit 35 includes an upper unit main body 351, an auxiliary roller 353, an upper rotating shaft 357 that supports the auxiliary roller 353, and an upper bearing 359 that rotatably supports the upper rotating shaft 357. The shape of the upper unit main body 351 as viewed from the front is also substantially T-shaped, and both left and right ends thereof are supported by the rail 39. A through hole is formed in the central portion of the upper unit main body 351, and an upper bearing 359 is mounted in the through hole. The upper rotary shaft 357 is supported by the upper bearing 359, and an auxiliary roller 353 is attached to one end thereof. The auxiliary roller 353 of this embodiment is made of metal, and has a diameter of about 200 mm as an example.

  The air cylinder unit 37 includes an air cylinder 371 and an air cylinder bracket 373 that supports the air cylinder 371. The air cylinder bracket 373 is supported by the rail 39 at both left and right ends. A vertical through hole is formed at the center of the air cylinder bracket 373, and the rod 375 of the air cylinder passes through the through hole. The rod 375 is connected to the upper unit main body 351 through a predetermined joint 377. For this reason, the upper unit 35 can be moved in the vertical direction by operating the air cylinder 371. In place of the air cylinder 371, a hydraulic cylinder or a stroke motor may be used.

  The lower unit main body 331 and the air cylinder bracket 373 are connected by a long bolt 379 parallel to the rail 39. For this reason, the lower unit main body 331 and the air cylinder bracket 373 move integrally. Further, since the air cylinder bracket 373 and the upper unit main body 351 are coupled by the rod 375 of the air cylinder 371, the air cylinder bracket 373 and the upper unit main body 351 are integrated when the air cylinder 371 is not operating. Move on. As a result, when the air cylinder 371 is not operating, the lower unit main body 331 and the upper unit main body 351 also move together. This means that the distance between the measuring roller 333 and the auxiliary roller 353 does not change. For this reason, the measuring roller 333 and the auxiliary roller 353 are integrally floated.

  On the other hand, when the air cylinder 371 operates, the distance between the lower unit main body 331 and the upper unit main body 351 changes. For example, when the rod 375 of the air cylinder 371 moves backward from the state shown in FIG. 4A, the upper unit main body 351 moves upward accordingly. For this reason, the auxiliary roller 353 is separated from the measuring roller 333. When the auxiliary roller 353 is separated from the measuring roller 333, the auxiliary roller 353 can be separated from the long material. At this time, a predetermined stopper 381 is fixed on the long bolt 379 between the lower unit main body 331 and the upper unit main body 351. An upper compression spring 383 is provided between the stopper 381 and the upper unit main body 351. For this reason, the upper compression spring 383 always applies upward spring force to the upper unit main body 351. Due to this spring force, the air cylinder 371 may not have a structure for positively retracting the rod 375. However, if the air cylinder 371 itself has a function of retracting the rod 375, the upper compression spring 383 is unnecessary.

[Second sensor]
As shown in FIGS. 1A and 1B, a second sensor 41 is installed on the downstream side of the movement amount measuring means 31. The second sensor 41 is for detecting that the end of the long material has arrived, and the structure is the same as that of the first sensor 11. By detecting the arrival of the tip of the long material, it can be used for various controls. For example, it is conceivable to use the measurement roller 333 and the auxiliary roller 353 as the timing for contacting the long material, or as the measurement start timing for the movement amount of the long material. A measuring roller operation sensor 51 is further provided between the movement amount measuring means 31 and the second sensor 41. When the measuring roller operation sensor 51 detects the arrival of the long material, the measuring roller 333 is provided. You may make it contact a long material.

[Measurement method]
Next, a method for measuring the length of the long material will be described with reference to FIG. The long material cut into a predetermined length by the cutting device 100 is conveyed toward the long material length measuring device 31 (from the right end in FIG. 1B to the left). Then, the leading end of the long material passes through the first sensor 11 and reaches the guide means 21. At this time, the two downstream guide rollers 213 are previously positioned in accordance with the width of the long material. For this reason, the downstream guide roller 213 suppresses vibration by sandwiching the long material from the left and right. On the other hand, the upstream guide roller 211 is separated from the long material. At this time, the distance between the two upstream guide rollers 211 is, for example, about 180 mm. This is to allow the width of the widest long material (for example, about 150 mm).

  When the long material is further conveyed, the leading end of the long material passes through the movement amount measuring means 31. In the movement amount measuring means 31, the measurement roller 333 and the auxiliary roller 353 come into contact with the long material after the elapse of a predetermined time after the long material is detected by the first sensor 11. Further, the upstream guide roller 211 is also positioned according to the width of the long material so as to contact the long material. The predetermined time is the time until the leading end of the long material passes through the moving amount measuring means 31 in consideration of the distance between the first sensor 11 and the moving amount measuring means 31 and the conveying speed of the long material. Is set longer. Then, the measurement roller 333 starts rotating as the long material is conveyed.

  When the leading end of the long material reaches the second sensor 41, measurement by the measuring roller 333 is started. Specifically, the rotational speed of the measuring roller 333 is measured by a pulse signal from a rotary encoder 339 (see FIG. 4A) connected to the measuring roller 333. Based on this rotational speed and the circumference of the measuring roller 333, the moving amount of the long material is calculated. And a measurement is complete | finished when the rear-end part of a elongate material passes the 1st sensor 11. FIG. At this timing, the upstream guide roller 211 is separated from the long material. Here, the distance between the first sensor 11 and the second sensor 41 is fixed. For this reason, the length of the long material is calculated by adding the moving amount of the long material measured by the moving amount measuring means 31 to the distance between the first sensor 11 and the second sensor 41. be able to. As described above, the guide means 21 provided immediately before the movement amount measuring means 31 prevents vibration that increases the measurement error, so that highly accurate length measurement is possible.

  FIG. 1A shows long materials P1, P2, and P3 having three types of lengths. These long materials P1, P2, and P3 will be specifically described as examples. First, when measuring the long material P1, the movement amount measuring means 31 starts measuring the movement amount X of the long material P1 from the time when the tip of the long material P1 reaches the second sensor 41. At this time, the length X1 remains behind the first sensor 11 in the long material P1. For this reason, when the long material P1 moves by X1, the rear end portion of the long material P1 passes through the first sensor. At that time, the measurement by the movement amount measuring means 31 is completed. That is, the length of the long material P1 can be measured by adding the movement amount X1 to the distance between the first sensor and the second sensor. The measurement of the long material P2 is the same as the case of the long material P1. However, in the case of the long material P2, the movement amount X is X2. Similarly, the moving amount X of the long material P3 is X3.

[Data processing method]
Next, a data processing method in which the calculation means 61 (see FIG. 1) determines the length of the long material based on the signal from the rotary encoder 339 will be described. As described above, the length of the long material can be calculated by adding the moving amount of the long material measured by the measuring roller 333 to the distance between the first sensor 11 and the second sensor 41. . Here, the distance between the first sensor 11 and the second sensor 41 is known, and this is referred to as Dmm for convenience. On the other hand, the moving amount of the long material measured by the moving amount measuring means 31 is Xmm. That is, the length L of the long material is calculated by L = D + X. The rotary encoder 339 can output 2000 pulses per rotation, for example. Therefore, the movement amount X can be calculated based on the number of pulses and the circumference of the measuring roller 333.

  However, a predetermined slip or the like occurs between the measuring roller 333 and the long material, which causes an error. In particular, the greater the amount of movement X during measurement (the longer the long material to be measured), the greater the error. In order to correct this, a major coefficient M was determined. The major coefficient M is a movement amount X measured on the horizontal axis, and a coordinate system in which the vertical axis is an error between the measured length of the long material and the actual length is set. It is obtained by plotting the material data. That is, the plotted data is averaged to determine a linear slope, and the value obtained by adding 1 to the slope value is the major coefficient M. Note that the error is obtained by accurately measuring the actual length of the long material by another method, subtracting the movement amount X by the measuring roller from the actual length, and further, the first sensor and the second sensor. The distance between sensors is subtracted. When an experiment was performed under various conditions for the specific long material length measuring apparatus 1, the major coefficient M was a predetermined value m. The fact that the major coefficient M is a predetermined value m means that the actual movement amount is m times the movement amount X calculated by the output of the rotary encoder 339. To explain with an extreme example, for example, it is assumed that the error is plotted against the movement amount X measured by the measuring roller, and the inclination thereof is 0.1. By adding the value 1 to this, the major coefficient M becomes 1.1. Then, the actual moving amount can be calculated by multiplying the moving amount X measured by the measuring roller by 1.1. This is a case where the measured movement amount X is shorter than the actual movement amount. It should be noted that the error is actually 0.1 times the movement amount, and is a smaller value.

  Further, in the long material length measuring apparatus 1 used in the experiment, a predetermined error E occurred regardless of the movement amount X. This is considered to be an error inherent to the long material length measuring apparatus 1 depending on the distance between the first sensor 11 and the second sensor 41. According to experiments, the error E was a predetermined value emm. The error E is obtained from a value obtained by subtracting the total length measured by the long material length measuring apparatus 1 of the present embodiment from the actual total length of the long material. That is, the actual total length of the long material is emm longer than the total length calculated using this embodiment. From the above, when the length L of the long material is calculated using the distance D between the first sensor 11 and the second sensor 41, the measure coefficient M, the movement amount X, and the error E, L = D + M XX + E. By the above data processing, it was finally possible to keep an error of about plus or minus 2 mm. Note that the above-described major coefficient M and error E are unique to each long material length measuring apparatus 1, and are determined by performing a calibration operation after the apparatus is installed.

DESCRIPTION OF SYMBOLS 1 ... Long material length measuring apparatus, 11 ... 1st sensor, 11a ... Laser light emission part, 11b ... Laser light-receiving part, 21 ... Guide means, 211 ... Upstream guide roller, 213 ... Downstream guide roller, 215 ... Upstream Side slider, 217 ... Upper long screw, 219 ... Reduction gear, 221 ... Upstream bracket, 223 ... Upstream servo motor, 225 ... Upstream support base, 227 ... Upstream base, 229 ... Upstream center screw, 231 ... Upstream block, 233 ... hex head, 235 ... oscillating arm, 237 ... fulcrum, 239 ... female screw block, 241 ... downstream long screw, 243 ... reduction gear, 245 ... downstream bracket, 247 ... downstream servomotor 249 ... Support bracket, 250 ... Downstream support base, 251 ... Downstream base, 253 ... Downstream center screw, 257 ... Hex head, 31 ... Movement amount Measuring means 33 ... Lower unit, 331 ... Lower unit body, 333 ... Measuring roller, 335 ... Lower rotating shaft, 337 ... Lower bearing, 339 ... Rotary encoder, 341 ... Coupling, 35 ... Upper unit, 351 ... Upper unit body 353, auxiliary roller, 357, upper rotary shaft, 359, upper bearing, 37, air cylinder unit, 371, air cylinder, 373, air cylinder bracket, 375, rod, 377, joint, 379, long bolt, 381 ... stopper , 383 ... Upper compression spring, 41 ... Second sensor, 51 ... Sensor for measuring roller operation, 61 ... Calculation means, 100 ... Cutting device, C ... Conveyance path, P ... Long material

Claims (11)

First and second sensors arranged on the upstream side and downstream side of the long material conveyance path to detect the presence or absence of the long material, and a predetermined time set between these first and second sensors A moving amount measuring means for measuring the moving amount of the long material in the inside,
A long material length measuring device comprising guide means for guiding the moving amount measuring means in the vicinity of the upstream side while suppressing vibration of the long material. The long material length measuring device according to claim 1,
The long material length measuring device, wherein the predetermined time is a time from when the second sensor detects the leading edge of the long material to when the first sensor detects the trailing edge of the long material. . The long material length measuring device according to claim 1 or 2,
The said guide means is a long material length measuring apparatus provided with the guide roller which contacts from the both sides of the width direction of the said long material. It is a long material length measuring device according to any one of claims 1 to 3,
Two sets of the guide rollers are provided, and the first set of guide rollers and the second set of guide rollers are in contact with the long material at different timings. It is a long material length measuring device according to any one of claims 1 to 4,
The guide roller is a long material length measuring device that comes into contact with the long material when at least the movement amount measuring unit measures the movement amount of the long material. It is a long material length measuring device according to any one of claims 1 to 5,
The moving amount measuring means includes a measurement roller that rotates in contact with the long material, and a long material that includes an auxiliary roller that is disposed so as to sandwich the long material between the measurement roller. Long measuring device. It is a long material length measuring device according to any one of claims 1 to 6,
The moving amount measuring unit is a long material length measuring device including a rotary encoder that counts the number of rotations of the measuring roller. It is a long material length measuring device according to any one of claims 1 to 7,
A long material length measuring device further comprising an actuator for bringing the auxiliary roller close to and away from the measuring roller. It is a long material length measuring device according to any one of claims 1 to 8,
The measurement roller and the auxiliary roller are supported by a predetermined rail extending in the vertical direction, and are capable of moving in the vertical direction when measuring the movement amount of the long material. It is a long material length measuring device according to any one of claims 1 to 9,
A long material length measuring apparatus comprising another guide means in the vicinity of the downstream side of the movement amount measuring means. It is the long material length measuring device according to any one of claims 1 to 10,
Computation means for calculating the length of the long material based on the distance D between the first sensor and the second sensor and the movement amount X from the movement amount measurement means, further comprising: An error coefficient proportional to the measured movement amount X, which is obtained by an averaging process of an error with respect to the movement amount X, and an error E independent of the movement amount X, and the long material. A long material length measuring device having a calculation function for calculating the length L by a mathematical formula of L = D + M × X + E.

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