JP2019078565A - Workpiece reading device - Google Patents

Abstract

To provide a workpiece reading device with which it is possible to more accurately and clearly image the plane contour shape of a tabular or sheet-like workpiece having flexibility and acquire an image measured value of a small error as compared with the actually measured dimension of the workpiece.SOLUTION: While correcting the distortion, etc., of a portion of a workpiece located between primary rollers 40, 40 and secondary rollers 41, 41 via the primary rollers 40, 40 and secondary rollers 41, 41, the workpiece reading device images this corrected portion of the workpiece through an imaging window 44 by a photographing camera 3, so that the incorrectness of the captured plane contour image of the workpiece can be eliminated and, consequently, an error between the actually measured value of the workpiece and an image measured value can be reduced.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a workpiece reading apparatus for photographing and reading a planar contour shape of a flexible plate-like or sheet-like workpiece.

  For example, as a workpiece reading device, there is one described in Patent Document 1 below, the applicant of the present application has placed the workpiece in the form of a flexible plate or sheet on the workpiece mounting surface. An image of the planar contour shape of the workpiece (hereinafter referred to as “planar contour image”) is generated by photographing the planar contour shape of the workpiece from above, and further, using the planar contour image of the workpiece, Developed independently for measuring dimensions.

JP-A-9-101125

  However, in the above-described work reading apparatus, since the work is in the form of a flexible plate or sheet, when such a work is placed on the work mounting surface, a part of the work is bent or distorted. As a result, the workpiece may be partially lifted from the workpiece surface, and the workpiece as a whole may not be flat.

  When the entire workpiece is not planar in this way, a planar contour image obtained by photographing the planar contour shape of the workpiece is distorted and inaccurate compared to the planar contour of the workpiece in a state in which the whole is planar. As a result, there is a problem that the planar contour image of the workpiece becomes inaccurate different from the planar contour shape of the entire actual workpiece.

  Then, the error between the measurement value of the workpiece dimension (hereinafter referred to as “image measurement value”) using the planar contour image of the workpiece and the actual dimension value of the workpiece (hereinafter referred to as “actual size value”) becomes large, and the image There is a problem that the measured value becomes inaccurate.

  The present invention has been made to solve the above-mentioned problems, and the planar contour shape of a flexible plate-like or sheet-like work can be photographed more accurately and clearly, and the actual size value of the work It is an object of the present invention to provide a workpiece reader capable of acquiring an image measurement value with a small error compared to the above.

  In order to achieve this object, the work reading apparatus according to the first aspect of the invention is mounted on a flat work mounting surface on which a flexible plate-like or sheet-like work is mounted, and the work mounting surface thereof. The imaging apparatus includes an imaging camera for imaging and reading a planar contour shape of a work, and further, a traveling body moving toward a predetermined direction above the work mounting surface and a rotation body provided on the traveling body A primary roller which rolls on the work with the movement of the traveling body with a load placed on the work and at least a part of the weight of the traveling body as a load, and a predetermined gap from the primary roller It is provided rotatably on the rear side of the traveling direction of the traveling body, and rolls on the workpiece along with the movement of the traveling body while being placed on the workpiece and applying at least a part of the weight of the traveling body to the workpiece as a load. Secondary roller And is disposed at an upper position opposite to the gap between the secondary roller and the primary roller, mounted on the traveling body in a state in which the distance to each roller is constant, and the planar contour shape of the work through the gap And the photographing camera for photographing the

  According to the work reading apparatus of the present invention, when taking a planar contour image of the work, the flexible plate-like or sheet-like work spreads flatly by being placed on the work mounting surface It becomes cool. The workpiece mounting surface is a flat portion on which the workpiece is placed, and serves as a background surface when the workpiece is photographed. The planar contour of the workpiece is photographed by photographing the workpiece with the photographing camera including the workpiece mounting surface serving as the background surface. In addition, it is preferable that the workpiece mounting surface has a color tone that makes the contrast stronger with respect to the workpiece.

  The traveling body mounts the photographing camera at an upper position opposed to the gap between the primary roller and the secondary roller with the distance from the photographing camera to the primary roller and the secondary roller being constant. As a result, the distance (height) from the photographing camera to the work (upper surface) through the predetermined gap between the primary roller and the secondary roller is maintained constant. In this state, a work (upper surface) appearing through a predetermined gap between the primary roller and the secondary roller is photographed by the photographing camera.

  As described above, the planar contour shape of the workpiece is photographed by the photographing camera. In such a case, the primary roller and the secondary roller function as wheels of the traveling body while resting on the workpiece, and therefore, rotate the workpiece. Work while using at least a part of the weight of the traveling body (the “total weight of the traveling body including the weight of the one mounted on the traveling body and others provided. The same applies hereinafter.) As a load (pressure) while rolling It will be added to

  Thus, the primary roller and the secondary roller stretch a portion of the workpiece located between the primary roller and the secondary roller by applying at least a part of the total weight of the traveling body as a load (pressure) to the workpiece, It is possible to flatten by correcting distortion and floating of the imaging portion by the imaging camera in the work. And, since the photographing camera photographs the portion of the work whose distortion and the like have been corrected in this way through the predetermined gap between the primary roller and the secondary roller, it is possible to eliminate the imprecision of the planar contour image of the work. The error between the measurement value (image measurement value) of the workpiece dimension (size) using the planar contour image of the workpiece and the actual dimension value (actual dimension value) of the workpiece can be reduced.

  By the way, for example, when the thickness of the workpiece (height from the workpiece loading surface to the top surface of the workpiece (workpiece height)) is uneven and increases or decreases depending on the location, the distance from the photographing camera to the workpiece loading surface Is constant, the distance from the photographing camera to the work appearing through the predetermined gap between the primary roller and the secondary roller when photographing the work by the photographing camera while the traveling body mounted with the photographing camera moves in a predetermined direction (Hereinafter, it is also referred to as "shooting distance" in this specification).

  The shooting distance is the distance from an arbitrary reference point of the shooting camera to the work (upper surface). Here, when the shooting camera is a digital camera, any reference point of the shooting camera is the light receiving surface of the imaging device .

  When the shooting distance fluctuates in this way, in the case of a fixed-focus type shooting camera, the focus is not on the workpiece, and a part of the planar contour image of the workpiece becomes unclear, and the planar contour image of the workpiece is an actual workpiece. It will be inaccurate different from the planar contour shape. Then, the error between the image measurement value and the actual size value regarding the dimension of the workpiece becomes large, which causes a problem that the image measurement value becomes inaccurate.

  In this respect, in the work reading device according to the first aspect of the invention, the primary roller provided on the traveling body when the traveling body mounted with the photographing camera moves in a predetermined direction (for example, a direction from the upstream side to the downstream side of the work mounting surface) When the secondary roller rolls on the workpiece, even if the thickness of the workpiece is uneven and the height of the workpiece is raised and lowered, the traveling body moves up and down while moving up and down. It is possible to keep the shooting distance to a constant.

  Therefore, it is possible to prevent the focal point of the photographing camera from shifting from the workpiece, so it is possible to eliminate blurring and inaccuracies of the planar contour image of the workpiece, and as a result, it is possible to reduce an error between the actual size value of the workpiece and the image measurement .

  A work reading apparatus according to a second aspect of the invention is the work reading apparatus according to the first aspect, further comprising: a movable support mounted on the traveling body supported in a vertically movable state; and a drive device for moving the movable support in the predetermined direction. And the moving body is applied to the work by providing the moving body with a force opposite to the acting direction of the weight of the traveling body (the action direction of gravity (vertical direction)) provided on the movable supporting body And a load reducing device for reducing the load applied.

  The force that the load reducing device applies to the traveling body is such that the magnitude (scalar) is 0 or more and less than the weight of the traveling body. Further, the force applied by the load reducing device may be appropriately adjusted so that a load necessary to extend the strain is applied to the work according to the type of the work.

  According to the work reading device of the second aspect of the present invention, in addition to the same action as the work reading device of the first aspect of the present invention, the driving device moves the movable support in a predetermined direction, thereby traveling mounted on the movable support. The body moves in a given direction. For example, when the drive device moves the movable support in the direction from the upstream side to the downstream side of the work mounting surface, the traveling body mounted on the movable support moves in the direction from the upstream side to the downstream side of the work mounting surface Move to

  As described above, the traveling body is mounted with the photographing camera and provided with the primary roller and the secondary roller, and the primary roller and the secondary roller roll on the work to determine the distance from the photographing camera to the work It is supposed to be kept constant.

  The traveling body is provided on the movable support so as to be capable of moving up and down, and the load reducing device provided on the movable support is a force in the opposite direction to the acting direction of the entire weight of the traveling body By applying a force smaller than the total weight of the body, only a part of the total weight of the traveling body is applied to the work through the primary roller and the secondary roller.

  By the way, if the full weight of the traveling body is applied as a load (pressure) to the workpiece while the primary roller and the secondary roller roll on the workpiece, the load applied to the workpiece is too large to withstand the weight, and plate-like Alternatively, the sheet-like work may be damaged due to plastic deformation such as bending. In addition, even if the work is not damaged, the plate-like or sheet-like work may temporarily cause elastic deformation such as bending or distortion when an overload is applied.

  On the other hand, according to the load reducing device according to the present invention, the load applied to extend the plate-like or sheet-like work is reduced to only a part of the total weight of the traveling body, so the plate-like or sheet-like It is possible to prevent overloading on the work of Therefore, the workpiece can be prevented from being damaged by plastic deformation such as bending, and the workpiece can also be prevented from temporarily causing elastic deformation such as bending or distortion. As a result, since it is possible to prevent the deformation of the planar contour shape of the workpiece photographed by the photographing camera, the imprecision of the planar contour image of the workpiece photographed by the photographing camera can be eliminated, and as a result, the actual size value and the image measurement value regarding the dimensions of the workpiece And the error between

  A work reading apparatus according to a third aspect of the invention is the work reading apparatus according to the second aspect, wherein the load reducing device uses a compressible fluid pressure actuator having visco-elastic characteristics to apply a force opposite to the acting direction of the weight of the traveling body. It is given.

  According to the work reading device of the third aspect of the invention, the load reducing device acts in the same manner as the work reading device of the second aspect of the invention, and the action direction of the weight of the traveling body is obtained by the compressible fluid pressure actuator having visco-elastic characteristics. Since the reverse force is applied, when the primary roller and the secondary roller roll on the work while the running body moves up and down, the viscoelastic property of each roller suppresses the jumping behavior of each roller on the work, and the running It is possible to prevent damage such as damage to the work by each roller bouncing on the work and colliding at times.

  A workpiece reading apparatus according to a fourth aspect of the present invention is the workpiece reading apparatus according to any of the first to third aspects, wherein a portion of the workpiece placed on the workpiece mounting surface located upstream in the moving direction of the traveling body is adsorbed. And a workpiece fixing device for preventing displacement of the workpiece due to rolling movement of the primary and secondary rollers.

  According to the work reading device of the fourth aspect of the present invention, it functions in the same manner as the work reading device of any of the first to third aspects of the invention, and further, a part positioned on the moving direction upstream side of the traveling body in the work The workpiece is pulled by the movement of the traveling body and rubbed on the workpiece loading surface when rolling the rollers on the workpiece while pressing the workpiece with the primary and secondary rollers. Misalignment can be prevented.

  Therefore, when photographing the workpiece by the photographing camera, it is possible to prevent the planar contour image of the workpiece from becoming inaccurate due to the displacement of the workpiece, and as a result, the error between the actual size value of the workpiece and the image measurement value It can be reduced.

  According to the work reading apparatus of the present invention, since it is possible to accurately and clearly capture the planar contour shape of a flexible plate-like or sheet-like work, an image measurement value with a small error compared to the actual size value of the work The effect is that you can get

It is a top view of the work reader which is one example of the present invention. It is a front view of a workpiece reader. (A) is a plan view of the workpiece fixing device, (b) is a longitudinal sectional view of the workpiece fixing device of (a), (c) is a longitudinal sectional view taken along line C-C of (b) It is. It is a longitudinal cross-sectional view in the IV-IV line of FIG. 1, and is an enlarged view of the center slit of a mount frame. It is a front view (projection figure from the right side of FIG. 2) of a workpiece | work reader, and a moving support body and a traveling body are front-viewed. It is a front view of a movable support body and a run body. It is a rear view of a movable support body and a traveling body. It is a top view of a movable support body and a run body. It is a right side view of a movable support body and a run object. It is a left side view of a movable support body and a run object. It is a longitudinal cross-sectional view in the XI-XI line of FIG.9 and FIG.10. It is a partial cross-sectional view in XII-XII of FIG.6 and FIG.7, and is mainly a top view of a pair of vertical motion guide apparatuses. It is the fragmentary longitudinal cross-sectional view which expanded the internal structure of the rocking connection shown in FIG. It is a longitudinal cross-sectional view in the XIV-XIV line of FIG. 6, and illustrates the internal structure of a traveling body.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. The workpiece reading device 1 according to the embodiment of the present invention is configured to measure the planar dimensions of the workpiece W based on the planar contour image obtained by photographing the planar contour shape of the workpiece W placed on the workpiece mounting surface 2 by the photographing camera 3. It is for measuring.

  FIG. 1 is a plan view of a workpiece reader 1 according to an embodiment of the present invention, and FIG. 2 is a front view of the workpiece reader 1. As shown in FIG. 1, the workpiece reading device 1 includes a gantry frame 4, and a horizontal table plate 5 is provided on the gantry frame 4. A flat work surface 2 is provided on the table plate 5.

  The work surface 2 is a surface on which a flexible plate-like or sheet-like work W is placed, and is formed of a cushioning (elastic) sheet-like shock absorbing material laid on the table plate 5. The cushioning material prevents the surface of the work W from being scratched. For example, the cushioning material used for the work loading surface 2 is a laminated sheet obtained by laminating and bonding a rubber urethane mat having elasticity under a soft non-woven sheet for preventing damage to the work W.

  According to the work mounting surface 2 using this cushioning material, when the work W is mounted thereon, the surface of the work W is prevented from being scratched by the soft non-woven sheet coming into contact with the work W On the other hand, by supporting the work W with a cushioned rubber urethane mat, the impact when the primary rollers 40, 40 and the secondary rollers 41, 41 described later roll on the work W is reduced.

  In the upper part of the gantry frame 4 provided with the work mounting surface 2, a narrow center slit 6 is provided at the center in the lateral width direction (vertical direction in FIG. 1). The center slit 6 is a straight groove extending in the vertical width direction (left and right direction in FIG. 1) of the gantry frame 4 and equally divides the work mounting surface 2 and the table plate 5 into two in the lateral width direction of the gantry frame 4 ing.

  A work fixing device 7 is provided in the center slit 6. The workpiece fixing device 7 adsorbs the workpiece W and fixes it at a predetermined position on the workpiece loading surface 2. The traveling body 11 described later moves to move the primary rollers 40 and 40 and the secondary rollers 41 and 41 to the workpiece W The work W is prevented from being displaced on the work surface 2 by the friction that occurs when rolling on the top of the work surface.

  For example, the workpiece fixing device 7 is provided on the upstream side (left side in FIG. 1) of the workpiece mounting surface 2 and is configured to fix one end side in the longitudinal direction of the workpiece W. In particular, in the case where the workpiece W is a long piece extending from the upstream side to the downstream side on the workpiece mounting surface 2, the longitudinal direction one end side of the workpiece W is fixed by the workpiece fixing device 7 on the workpiece W By rolling the primary rollers 40 and 40 and the secondary rollers 41 and 41 from the upstream side to the downstream side of the work surface 2, it is possible to elongate the distortion or floating of the work W and to work the work W.

  On the other hand, since the other end side in the longitudinal direction of the work W located on the downstream side of the work mounting surface 2 is a free end, the primary rollers 40 and 40 and the secondary rollers 41 and 41 are from the upstream side of the work mounting surface 2 When rolling on the work W toward the downstream side, the work W is easily extended and spread by appropriately moving one of the longitudinal direction other end sides of the work W.

  A movable support 10 is disposed at one end side in the vertical width direction of the gantry frame 4, that is, at the end on the upstream side (left side in FIGS. 1 and 2) of the work mounting surface 2. Further, a traveling body 11 is mounted on the movable support 10. In the gantry frame 4, traveling rails 12 a for the traveling linear guides 12 are disposed on both sides (upper and lower sides in FIG. 1) of the table plate 5 in the width direction.

  The travel rails 12a, 12a of the travel linear guides 12, 12 are linear for the travel linear guide 12 that guides the movable support 10 to linearly reciprocate in the vertical width direction of the gantry frame 4 The guide rail has a length from one end side to the other end side in the vertical width direction of the gantry frame 4.

  The drive rack 13 is a part of a drive device, and is a rack (a kind of linear gear) in which a plurality of gear teeth are inscribed in a common gear on one surface of the drive rack 13. It is from one end side to the other end side in the vertical width direction. The drive rack 13 is disposed on one side in the lateral width direction of the table plate 5 in the gantry frame 4 in parallel to the traveling rail 12 a.

  A control box 14 incorporating a control device (not shown) for controlling various operations of the workpiece reading device 1 is provided on one end side of the gantry frame 4 in the vertical width direction, that is, on the upstream side of the workpiece loading surface 2 There is. An operation panel 15 for operating the work reading device 1 is provided on the upper front surface (see FIG. 2) of the control box 14.

  3 (a) is a plan view of the workpiece fixing device 7, FIG. 3 (b) is a longitudinal sectional view of the workpiece fixing device 7 of FIG. 3 (a), and FIG. 3 (c) is FIG. It is a longitudinal cross-sectional view in the CC line of (b). As shown in FIG. 3, the work fixing device 7 includes a plurality of magnet units 16, a slide fixing tool 17, and a slide fixing rail 18.

  The plurality of magnet units 16 are arranged in the extending direction of the center slit 6. The magnet unit 16 can be fixed at any position in the extending direction of the center slit 6 with respect to the slide fixing rail 18 by the slide fixing tool 17 using a bolt and a nut. By releasing the fixation, the center slit 6 can be moved to any position in the extending direction.

  The magnet unit 16 is provided with a magnet block 16a elongated in the extending direction of the center slit 6, and a plurality of (six in the drawing) circular cap magnets 16b in plan view are formed on the top of the magnet block 16a. Are arranged at equal intervals in the extending direction of the center slit 6. The cap magnet 16b is provided with a yoke (iron material) 16b2 on the outer periphery of the circular permanent magnet 16b1, and the yoke 16b2 is formed in a cap shape covering the outer periphery and the bottom of the permanent magnet 16b1.

  The magnet unit 16 includes a support block 16 c that supports the magnet block 16 a, and the support block 16 c is also elongated in the same direction as the extending direction of the center slit 6. Both ends in the longitudinal direction of the support block 16 c are fixed to the slide fixing rail 18 via the slide fixing tool 17.

  Both longitudinal end portions (left and right sides in FIG. 3A) of the magnet block 16a are provided via leaf springs 16d and 16d disposed at both longitudinal end portions (right and left sides in FIG. 3A) of the fixed block 16c. It is supported in a state of being lifted above the fixed block 16c.

  According to this magnet unit 16, the magnet block 16a is urged upward from the support block 16c by the elastic restoring force of the plate springs 16d and 16d, and when the force pressing the magnet block 16a acts downward, the plate spring 16d , 16d, while the magnet block 16a descends, and when this pressing force is released, the magnet block 16a ascends to its original position by the elastic restoring force of the leaf springs 16d, 16d.

  Therefore, according to the magnet unit 16, for example, even if the upper end surface of the magnet block 16a protrudes from the center slit 6 above the upper surface of the work mounting surface 2, the primary rollers 40, 40 and the secondary rollers 41, 41 The magnet block 16a can be lowered via the force pressing the workpiece W against the workpiece loading surface 2 while rolling, while the magnet block 16 is returned to the original height position via the elastic restoring force of the plate springs 16d and 16d. You can also

  Also, for example, when the upper end surface of the magnet block 16a is positioned below the center slit 6 and the upper surface of the work mounting surface 2, the cap 16a is lifted by the elastic deformation of the plate springs 16d and 16d. The magnet 16 b can also be attracted to the workpiece W on the workpiece mounting surface 2.

  As shown in FIG. 3B, in the magnet unit 16, the upper end surfaces of all the cap magnets 16b have the same height as the upper surface of the workpiece mounting surface 2, and the cap magnets 16b and the workpiece mounting surface 2 are surfaces It has become one. This prevents the occurrence of damage such as partial bending and bending of the workpiece W adsorbed through the magnetic force of the cap magnet 16b.

  As a modification of magnet unit 16, it may replace with cap magnet 16b which used permanent magnet 16b1, and may use an electromagnet which can turn on-off a magnetic force. Also, as a modification of the workpiece fixing device 7, in place of using a magnet, a device that sucks surrounding air to generate a negative pressure and adsorbs the workpiece W by this negative pressure may be used.

  A total of four traveling blocks 12b, 12b, 12b and 12b are disposed at the four corners of the bottom of the movable support 10 shown in FIGS. 1 and 2 (FIGS. 6, 7, 9 and 10). reference.). Each traveling block 12b is a guide block for traveling linear guides 12 linearly moving on the traveling rails 12a with low frictional resistance, and the traveling rails 12a are mounted in a state of being straddled over each traveling rail 12a. It can be reciprocated linearly in the full length direction (left and right direction in FIGS. 1 and 2).

  Specifically, the two traveling blocks 12b and 12b on one side of the bottom portion of the movable support 10 in the lateral width direction (vertical direction in FIG. 1 and the vertical direction with respect to FIG. 2) The carriage frame 4 is mounted on a traveling rail 12a at one side in the lateral width direction (vertical direction in FIG. 1, vertical direction with respect to the paper surface of FIG. 2) of the gantry frame 4 at an interval.

  The two traveling blocks 12b and 12b on the other side of the bottom of the movable support 10 in the lateral width direction (the vertical direction in FIG. 1 and the vertical direction with respect to the sheet of FIG. 2) 1), and is mounted on the traveling rail 12a on the other side of the gantry frame 4 in the width direction (vertical direction in FIG. 1, vertical direction with respect to the paper surface of FIG. 2).

  As described above, the movable support 10 includes two sets of traveling linear guides 12 each including a pair of traveling rails 12a and 12a and a total of four traveling blocks 12b, 12b, 12b and 12b placed two by two. , 12 can be reciprocally moved from one of the upstream side (FIG. 1 and FIG. 2 left side) or the downstream side (right side of FIG. 1 and FIG. 2) of the work surface 2 toward the other.

  FIG. 4 is a longitudinal sectional view taken along line IV-IV in FIG. 1 and is an enlarged view of the center slit 6 of the gantry frame 4. As shown in FIG. 4, the work fixing device 7 described above is disposed in the center slit 6 of the gantry frame 4.

  In the work fixing device 7, a support block 16c of the magnet unit 16 is fixed to the slide fixing rail 18 via the slide fixing tool 17. The slide fixing rail 18 is fixed to the gantry frame 4 by a bolt and a nut. In the upper surface of the slide fixing rail 18, an engagement groove 18a for engaging the slide fixing tool 17 is recessed. The slide fixing rail 18 and the engagement groove 18 a recessed therein are extended in the vertical width direction (vertical direction with respect to the paper surface of FIG. 4, horizontal direction of FIG. 1) of the gantry frame 4.

  The slide fastener 17 includes an engagement bolt 17a having a head engaged with the magnet block 16a of the magnet unit 16 and a shaft inserted through the support block 16c, and a shaft of the engagement bolt 17a being screwed And an engaging nut 17b.

  According to the slide fastener 17, the support block 16c of the magnet unit 16 is fastened to the slide fastening rail 18 by screwing the engagement bolt 17a into the engagement nut 17b, and the fastening of the magnet unit 16 to the center slit 6 by this fastening. It can be fixed at any position in the direction. Further, according to the slide fixing tool 17, the fixing of the support block 16 c of the magnet unit 16 can be released by loosening the fastening of the engagement bolt 17 a and the engagement nut 17 b, and the magnet unit 16 is moved in the center slit 6. become able to.

  5 to 14 are explanatory views of the movable support 10 and the traveling body 11. In particular, FIG. 5 is a front view (a projection view from the right side of FIG. 2) of the workpiece reading device 1 and is a front view of the movable support 10 and the traveling body 11. FIG. 6 is a front view of the movable support 10 and the traveling body 11. FIG. 7 is a rear view of the movable support 10 and the traveling body 11. FIG. 8 is a plan view of the movable support 10 and the traveling body 11. FIG. 9 is a right side view of the movable support 10 and the traveling body 11. FIG. 10 is a left side view of the movable support 10 and the traveling body 11.

  FIG. 11 is a longitudinal sectional view taken along line XI-XI in FIGS. 9 and 10. FIG. 12 is a partial cross-sectional view in XII-XII in FIG. 6 and FIG. 7, and is mainly a plan view of a pair of vertical movement guide devices 60. FIG. 13 is a partial longitudinal sectional view enlarging the internal structure of the swing coupling device 70 shown in FIG. FIG. 14 is a longitudinal sectional view taken along line XIV-XIV in FIG. 6 and illustrates the internal structure of the traveling body 11.

  Here, the front surfaces of the movable support 10 and the traveling body 11 illustrated in FIGS. 5 to 14 are directed forward in the moving (traveling) direction, and the back surfaces are directed rearward in the moving direction. Further, the vertical width directions of the movable support 10 and the traveling body 11 coincide with the moving directions thereof, and the horizontal width directions thereof coincide with the moving directions orthogonal to the moving directions in the horizontal plane. In particular, the arrow X in FIGS. 8 to 10 and 12 to 14 has its arrow tip facing forward in the moving (traveling) direction of the movable support 10 and the traveling body 11, and the opposite arrow end of the arrow X in FIG. It is directed to the moving (traveling) direction of the body 11.

  The moving support 10 shown in FIG. 5 to FIG. 14 moves in the forward direction (arrow X direction) from the upstream side to the downstream side of the work mounting surface 2 via the traveling linear guides 12 and 12 described above, and Is horizontally movable on the workpiece mounting surface 2 in a state in which the traveling body 11 is mounted in the reverse movement direction (the direction of the reverse arrow X) in the reverse direction. The traveling body 11 reciprocates between the upstream side and the downstream side of the work surface 2 via the movable support 10. In addition, the traveling body 11 is supported so as to be vertically movable with respect to the movable support 10, and is vertically movable in the vertical direction with respect to the work mounting surface 2.

  The movable support 10 is formed in a frame shape by a hollow square pipe, and the bottom surface and the back surface (rear surface) of the movable support 10 are a frame having a rectangular shape. Further, the traveling body 11 is formed in a frame shape with a hollow square pipe, and is formed into an octahedral frame body having a trapezoidal shape whose front and rear surfaces are symmetrical in the left-right direction and a remaining surface having a rectangular shape. The traveling body 11 is accommodated in the frame of the movable support 10.

  In addition to the drive rack 13 described above, the drive device of the work reading device 1 includes the next drive motor 19, a drive gear 20, a bearing device 21, and an auxiliary gear 22. The drive motor 19 is mounted on one side in the lateral width direction of the movable support 10. The drive motor 19 applies a driving force for moving the movable support 10 linearly and horizontally above the work surface 2. The drive motor 19 is an AC servomotor that rotates a drive gear 20 which is a spur gear engaged with the drive rack 13 described above.

  Further, in the movable support 10, a bearing device 21 rotatably supporting the auxiliary gear 22 is disposed side by side with the drive motor 19. The auxiliary gear 22 is an auxiliary spur gear that is meshed with the drive gear 20 and the drive rack 13.

  In a state in which the drive gear 20 and the auxiliary gear 22 mesh with the drive rack 13, the drive gear 20 is rotated by the drive motor 19, so that the movable support 10 is along the two travel rails 12a, 12a. As a result, it is moved from one end side or the other end side in the vertical width direction of the gantry frame 4 toward the other.

  At the bottom of the movable support 10, four traveling blocks 12b, 12b, 12b, 12b mounted on the traveling rails 12a, 12a of the two sets of traveling linear guides 12, 12 described above are fixed. Among them, two traveling blocks 12b and 12b hold one traveling rail 12a, and the remaining two traveling blocks 12b and 12b hold the other traveling rail 12a, respectively, and along the traveling rails 12a and 12a. The sliding rails 12a and 12a are mounted on the traveling rails 12a and 12a in a slidable manner with low friction resistance.

  The top of the frame of the traveling body 11 protrudes upward from the upper opening of the movable support 10, and the photographing camera 3 is mounted on the top. The photographing camera 3 is fixed to the traveling body 11 via a camera fixing bracket 30, and can be vertically moved via the camera fixing bracket 30. The vertical movement of the camera fixing bracket 30 allows the position of the photographing camera 3 to be adjusted vertically, and as a result, the photographing distance of the photographing camera 3 can be finely adjusted.

  In particular, as shown in FIG. 11 and FIG. 14, the photographing camera 3 is a fixed focus type line scan camera for photographing and reading the planar contour shape of the workpiece W placed on the workpiece mounting surface 2. The photographing camera 3 is fixed by the camera fixing bracket 30 in a state in which the optical axis of the lens 31 (the alternate long and short dash line in FIG. 14) is directed vertically downward. It is perpendicular to the work surface 2 placed on the. As a result, the optical axis of the photographing camera 3 is perpendicular to the surface to be photographed (upper surface) of the workpiece W placed on the workpiece mounting surface 2.

  The vertical distance H from the tip of the lens barrel of the lens 31 to the lowermost end of each of the four primary rollers 40 and 40 and the secondary rollers 41 and 41 disposed at the bottom of the traveling body 11 The distance corresponding to the working distance is set to the same and constant value, and the vertical distance H is kept constant during the photographing operation. Here, since the lowermost ends of the outer peripheries of the four primary rollers 40, 40 and the secondary rollers 41, 41 contact the upper surface of the work W, the four primary rollers 40 from the barrel end of the lens 31 of the photographing camera 3 The vertical distance H to the lowermost end of the outer circumference of 40 and the secondary rollers 41, 41 substantially corresponds to the working distance of the photographing camera 3.

  In the present embodiment, the photographing camera 3 is of a fixed focus type, and since the focal distance is kept constant during the photographing operation, the mechanical distance (lens is different from that of the autofocus camera). The distance from the tip of the lens barrel 31 to the film surface (the light receiving surface of the imaging device in the case of a digital camera) becomes constant during the photographing operation. As a result, in the workpiece reading device 1 of the present embodiment, the shooting distance which is the distance obtained by adding the working distance (vertical distance H) of the photographing camera 3 and the mechanical distance also becomes constant.

  Further, the angle of view of the photographing camera 3 is the entire width of the workpiece W placed on the workpiece placement surface 2 in the lateral width direction of the traveling body 11, that is, the lateral width direction of the workpiece W. It is set to a value that includes a part. In the present embodiment, the working distance (vertical distance H) of the photographing camera 3 is set to 420 mm, and the angle of view thereof is set to 63.13 °.

  As shown in FIG. 5 to FIG. 14, the primary rollers 40, 40 are rotatably provided on the traveling body 11, and are placed on the work W and add at least a part of the total weight of the traveling body 11 to the work W as a load. The roller rolls on the workpiece W as the traveling body 11 moves. Further, the secondary rollers 41, 41 are rotatably provided on the rear side in the moving direction of the traveling body 11 with a predetermined gap from the primary rollers 40, 40, and rest on the workpiece W to at least the total weight of the traveling body 11. It is a roller that rolls on the workpiece W along with the movement of the traveling body 11 while adding a part as a load to the workpiece W.

  In particular, as shown in FIGS. 6 and 7, the primary rollers 40, 40 are two rollers disposed on the front side in the traveling direction of the traveling body 11, and the secondary rollers 41, 41 are of the traveling body 11. Two rollers are disposed on the rear side in the traveling direction. These primary rollers 40 and 40 and secondary rollers 41 and 41 are disposed at the bottom of the traveling body 11 as described above, and apply a part of the total weight of the traveling body 11 to the work W as a load (pressure) Therefore, it is a hollow cylindrical rotating body that rolls on the workpiece W.

  The primary rollers 40, 40 and the secondary rollers 41, 41 are formed in a hollow cylindrical shape in which all the four rollers have the same axial length and the same inner diameter and outer diameter, and each shaft Both direction end portions are rotatably supported via a plurality of roller bearings 43, 43,... Provided on a plurality of roller brackets 42 vertically provided from the bottom of the traveling body 11. The tip of each roller bearing 43 is inserted into the inner periphery of each roller 40 or 41, and each roller 40, 40 is inserted via a bearing (not shown) fixed to the outer periphery of the tip. , 41, 41 are rotatably supported.

  The primary rollers 40, 40 are divided into two rollers at the center of the lateral width direction of the traveling body 11 (left and right direction in FIG. 6), and the lateral widths of the traveling body 11 are parallel to each other. Are arranged in a row. Similarly, the secondary rollers 41, 41 are divided into two rollers at the center in the width direction (left and right direction in FIG. 7) of the traveling body 11, and travel with the rotation axes aligned on the same line. They are arranged in a line in the width direction of the body 11.

  As described above, each of the primary rollers 40 and 40 and the secondary rollers 41 and 41 is formed in a hollow cylindrical shape to reduce weight, and further, two or more short rollers in the axial direction thereof Since both axial ends of each of the divided rollers are supported by the roller bearings 43, the distance between the roller bearings 43 can be shortened, and the deflection caused by the increase in the total length of the rollers Can be reduced.

  As a result, the primary rollers 40, 40 and the secondary rollers 41, 41 can uniformly contact the workpiece W in the axial direction and apply a load to the workpiece W, thereby further reducing the deflection and the floating of the workpiece W. . As a result, the portion of the workpiece W photographed through the photographing window 44 which is a gap of a predetermined width described later by the photographing camera 3 can be brought closer to a planar state.

  As shown in FIGS. 9 to 11, one load reducing device 50 is disposed on each side of the movable support 10 in the width direction. The pair of load reducing devices 50, 50 adjust the load applied to the workpiece W when the traveling body 11 travels on the workpiece W and captures a planar contour image of the workpiece W by the photographing camera 3; Each of the compressible fluid pressure actuators is a pneumatic cylinder 51, 51 using compressed air as the viscous compressible fluid. .

  The pair of load reducing devices 50, 50 are suspended from cylinder brackets 52, 52 whose cylinder bodies 51a, 51a are fixed on both sides in the width direction of the movable support 10, and the tips of the cylinder rods 51b, 51b Are connected to the cylinder brackets 53, 53 fixed on both sides in the width direction of the traveling body 11. According to the pair of load reducing devices 50, 50, the cylinder rods 51b, 51b are retracted into the cylinder bodies 51a, 51a by supplying compressed air, and the traveling body 11 is raised relative to the movable support 10 The force for pulling up the traveling body 11 is released by the cylinder rods 51b and 51b protruding from the cylinder main bodies 51a and 51a while the force for pulling up the traveling body 11 with respect to the movable support 10 is released.

  Here, an air compressor, which is a supply source of compressed air, is connected to each of the pair of load reducing devices 50, 50 via a pneumatic circuit (not shown), and the compressed air adjusted to a predetermined pressure value by the pneumatic circuit. Is supplied as the working fluid. This pneumatic circuit has a pressure regulator capable of changing the setting of the pressure value of the compressed air supplied to the pair of load reducing devices 50, 50 according to the type of the work W, and according to the set value of this compressed air. Thus, the magnitude of the force generated by the pair of load reducing devices 50, 50 can be adjusted.

  Thus, by supplying compressed air adjusted to a predetermined pressure value through the pneumatic circuit, the pair of load reducing devices 50, 50 are in the opposite direction to the acting direction (vertical direction) of the total weight of the traveling body 11 The sum of the pulling forces generated by the pair of load reducing devices 50, 50 is smaller than the total weight of the traveling body 11, and a portion of the total weight of the traveling body 11 is generated. Is adjusted to be applied as a load to the work W via the primary rollers 40, 40 and the secondary rollers 41, 41.

  Here, the difference between the sum of the pulling forces by the pair of load reducing devices 50, 50 and the load of the entire traveling body 11, that is, the setting of the load applied to the work W Depending on the type of work W, it is supplied to the pair of load reduction devices 50, 50 so that floating and distortion can be corrected and the load does not cause damage such as deformation on the work W. The pressure of the compressed air is adjusted by a pneumatic circuit.

  Further, as described above, the pair of load reducing devices 50, 50 have visco-elastic characteristics because they use a viscous compressible fluid called compressed air as the working fluid, and as a result, the mass using the total mass of the traveling body 11 -Spring-Since it constitutes a damper system (also referred to as a damping vibration system), the work W is processed using the primary rollers 40, 40 and the secondary rollers 41, 41 as wheels via the projection and retraction of the cylinder rods 51a, 51a. It also functions as a shock absorber when traveling on the top.

  Although the damping vibration system using the mass of the traveling body 11 described above can be modeled as a system with one degree of freedom, the degree of freedom of the damping vibration system is not necessarily limited to this. Instead, it may be a damping vibration system having two or more degrees of freedom.

  Moreover, in the load reducing device 50, the cylinder body 51a is swingably connected to the cylinder bracket 52 via the swing pin 52a. For this reason, when the traveling body 11 swings around the swing connection shaft 72 of the swing connection device 70 described later, the load reducing device 50 works in conjunction with the swing of the travel body 11 to move the swing pin 52a. 11 can be swung in the forward rotation direction (clockwise direction in FIG. 11) and the reverse rotation direction (counterclockwise direction in FIG. 11).

  As shown in FIG. 12, the traveling body 11 moves up and down with respect to the movable support 10 on both sides in the width direction of the traveling body 11 (see both left and right sides in FIG. 11). Vertical movement guide devices 60 for guiding are provided respectively.

  The pair of vertical movement guide devices 60, 60 are each arranged on the traveling body 11 and are in the form of a rail extending in the vertical direction, and the guide bar 61 is rotated on the movable support 10 with the guide bar 61 sandwiched from both sides. A pair of guide rollers 62, 62 supported thereby is provided.

  According to the vertical movement guide device 60, when the traveling body 11 moves up and down relative to the movable support 10, the guide bar 61 disposed on the traveling body 11 moves up and down between the pair of guide rollers 62, 62, The vertical movement of the traveling body 11 relative to the movable support 10 is induced by inducing the vertical movement of the guide bar 61 while the pair of guide rollers 62, 62 sandwiching the guide bar 61 rolling and rotating due to the vertical movement of the guide bar 61. Will be guided.

  As shown in FIG. 13, when the traveling body 11 moves up and down with respect to the movable support 10, the up and down movement of the traveling body 11 is guided through the connection linear guide 71 of the swing connection device 70. It has become.

  The swing coupling device 70 is disposed on the rear upper side in the traveling direction of the movable support 10 and the traveling body 11, and connects the movable support 10 and the traveling body 11. The swing connection device 70 includes a connection rail 71a which is a linear guide rail fixed to the traveling body 11, and a connection block 71b which is a guide block which can be reciprocated in the vertical direction by being engaged with the connection rail 71a. And a rocking connection shaft 72 horizontally projecting from the connection block 71b rearward (in the direction of the arrow X) in the direction of travel of the traveling body 10, and the rocking connection shaft 72 can be rotated. It has a rocking connection bearing portion 73 to support, and a connection bracket 74 fixed to the movable support 10 to support the rocking connection bearing portion 73.

  The swing coupling device 70 couples the traveling body 11 vertically movably to the movable support 10 via a coupling linear guide 71. Further, in the rocking connection device 70, the connection linear guide 71 is rotatably connected to the connection bracket 74 in the forward and reverse directions via the rocking connection shaft 72.

  According to this rocking connection device 70, the connection rail 71a of the connection linear guide 71 disposed on the traveling body 11 side moves up and down relative to the connection block 71b disposed on the movable support 10 side. The traveling body 11 moves up and down with respect to the movable support 10. In addition, the swinging connecting shaft 72 of the connecting linear guide 71 disposed on the side of the traveling body 11 rotates in the forward direction with respect to the connecting bracket 74 having the swinging connection bearing portion 73 disposed on the moving support 10 side. 7 in the clockwise direction) or in the reverse direction (counterclockwise direction in FIG. 7), the traveling body 11 rotates in the forward direction (clockwise direction in FIG. 7) and the reverse direction (in FIG. It swings in the counterclockwise direction of FIG.

  As shown in FIG. 14, the primary rollers 40, 40 and the secondary rollers 41, 41 are disposed with a gap of a predetermined width in the moving direction of the traveling body 11. A gap (slit) having a predetermined width between the primary rollers 40 and 40 and the secondary rollers 41 and 41 has a window 44 for photographing the work W by the photographing camera 3 (hereinafter referred to as “photographing window”). ). The photographing camera 3 is disposed at a position immediately above the photographing window 44, and photographs a plane contour image of the work W through the photographing window 44. Further, the photographing window 44 is a gap which is linearly continuous from one end side to the other end side of the traveling body 11 in the lateral width direction (vertical direction with respect to the sheet of FIG. 14). ing.

  The photographing illumination device 45 is fixed to the lower part of the front side (the traveling direction front side) lower part of the traveling body 11 via the illumination bracket 46, and avoids the position just above the photographing window 44 and It is arranged. The photographing illuminator 45 is an upper surface (photographed surface) of the work W mounted on the work surface 2 through the photographing window 44 from a position above the four primary rollers 40 and 40 and the secondary rollers 41 and 41. The illumination light is emitted in a cycle synchronized with the scan rate (shooting cycle or shooting frequency) of the shooting camera 3.

  For example, according to the photographing illuminator 45, when the scanning rate of the photographing camera 3 has a cycle of 125 μsec (= frequency 8 kHz), the traveling body 11 moves from the upstream side to the downstream side of the work surface 2 during this period. Irradiation of illumination light and repetition of illumination with a predetermined duty ratio are repeated through the photographing window 44 with an irradiation cycle of 125 μsec synchronized with the scan rate.

  According to the work reading apparatus 1 of the present embodiment described above, when the drive motor 19 is driven to rotate, the drive gear 20 and the auxiliary gear 21 meshed with the drive rack 13 are rotated forward to move the movable support 10. Start moving in the direction from the upstream side to the downstream side of the work surface 2 (arrow X direction). When the drive motor 19 rotates the drive gear 20 at a constant rotational speed, the movable support 10 moves the traveling body 11 mounted on the movable support 10 from the upstream side to the downstream side of the work surface 2 Move at a constant speed towards you. Then, the photographing camera 3 mounted on the traveling body 11 moves at a constant speed from the upstream side to the downstream side of the work surface 2.

  In the process of this movement, the photographing camera 3 moves at a constant speed from one end (left side in FIG. 1) to the other end side (right side in FIG. 1) of the workpiece W in the longitudinal direction. ) Is repeatedly taken (read) a planar contour image of a partial work W viewed from the shooting window 44 by the shooting camera 3 at a predetermined scan rate, and a plurality of partial The planar contour images g1, g2, g3,... Are respectively recorded (stored) in a memory (not shown).

  The plurality of partial plane contour images g1, g2, g3,... Are taken at photographing positions X1, X2, X3,... Whose positions differ by a predetermined distance in the moving direction of the traveling body 11 (arrow X direction). It is a partial planar outline image which image | photographed the workpiece | work, and the imaging | photography order (photographing | shooting of planar contour image g1, g2, g3, ... of this some partial workpiece | work W by image processing means (not shown) The entire planar contour image G of the work W is generated by connecting at the positions X1, X2, X3,. Further, the image measurement means (not shown) calculates an image measurement value of the dimension of the workpiece based on the overall planar contour image G of the workpiece.

  For example, in the case where the scan rate (shooting cycle) of the photographing camera 3 is 125 μsec and the resolution in the moving direction of the photographing camera 3 is about 0.045 mm / pixel, the moving support 10 on which the traveling body 11 is temporarily mounted. Is moved by 0.04 mm every 125 .mu.sec and the work W is photographed by the photographing camera 3, the moving support 10 is directed from the upstream side to the downstream side of the work mounting surface 2 at a speed of 320 mm / sec. If moved, the shooting positions X1, X2, X3, ... of the plurality of partial planar contour images g1, g2, g3, ... are coordinated by 0.04 mm in the longitudinal direction (X direction) of the workpiece. The position will be different.

  The control device (not shown) accommodated in the control box 14 described above controls the drive motor 19 of the drive device and the load reducing devices 50, 50 via the pneumatic circuit described above (not shown). And a photographing control means (not shown) for controlling the photographing timing (scan timing) of the photographing camera 3. Each of these drive control means and imaging control means performs control based on the number of output pulses from a rotary encoder (not shown) that detects the amount of rotation of the drive motor 19.

  For example, the drive control means calculates the amount of rotation of the drive gear 20 based on the number of output pulses of the rotary encoder, calculates the amount of movement and movement speed of the movable support 10 based on this amount of rotation, and By configuring a feedback control system for the moving speed and executing position control and speed control for the moving support 10 moving in the X direction, as a result, the position of the photographing camera 3 mounted on the traveling body 11 in the X direction Control and speed control.

  Further, the photographing control means calculates the amount of rotation of the drive gear 20 based on the number of output pulses of the rotary encoder, calculates the amount of movement of the movable support 10 based on the amount of rotation, and photographs based on the amount of movement The coordinate position in the X direction of the camera 3 is calculated, and synchronous control of the photographing timing (scan timing) is performed based on the coordinate position of the photographing camera 3 in the X direction. Every time it moves by 0.04 mm, the photographing operation of the photographing camera 3 and the irradiation operation of the photographing illuminator are executed.

  Also, the vertical distance H from the end of the barrel of the lens 31 of the photographing camera 3 to the lowermost end (contact surface with the work) of the primary rollers 40, 40 and the secondary rollers 41, 41 is constant. In the state, by mounting the photographing camera 3 at the upper position facing the photographing window 44, the photographing distance (photographing height) from the photographing camera 3 to the (upper surface of) the work W through the photographing window 44 is maintained constant. Then, the photographing camera 3 photographs (the upper surface of) the workpiece W partially appearing through the photographing window 44 between the primary rollers 40, 40 and the secondary rollers 41, 41.

  Here, in the case where the planar contour shape of the work W is photographed by the photographing camera 3, a pair of load reducing devices 50 provided on the movable support 10 is provided on the traveling body 11 provided on the movable support 10 so as to be vertically movable. , 50, a part of the total weight of the traveling body 11 is applied to the work W as a load (pressure) through the primary rollers 40, 40 and the secondary rollers 41, 41. At this time, the primary rollers 40, 40 and the secondary rollers 41, 41 function as the wheels of the traveling body 11 in a state of being placed on the work W, and rotate all over the work W while rolling. At least a portion of the weight is applied to the workpiece W as a load (pressure).

  Thus, the primary rollers 40, 40 and the secondary rollers 41, 41 add at least a part of the total weight of the traveling body 11 as a load to the work W, thereby the primary rollers 40, 40 and the secondary rollers in the work W It is possible to extend the portion positioned between 41 and 41, and to make it flat by correcting distortion or floating of a portion of the work W taken by the photographing camera 3 with the portion.

  Therefore, according to the work reading device 1 of the present embodiment, the portion of the work W located between the primary rollers 40, 40 and the secondary rollers 41, 41 via the primary rollers 40, 40 and the secondary rollers 41, 41. Since the relevant part of the workpiece W whose distortion and the like are corrected is photographed by the photographing camera 3 through the photographing window 44 while correcting the distortion and the like, inaccuracies in the planar contour image of the photographed workpiece W can be eliminated. The error between the actual size value of the workpiece and the image measurement value can be reduced.

  Moreover, in the case where the traveling body 11 mounted with the photographing camera 3 moves from the upstream side to the downstream side of the work mounting surface 2, the primary rollers 40, 40 and the secondary rollers 41, 41 provided on the traveling body 11 Even when the thickness of the workpiece W is uneven when the workpiece W rolls over, and the height of the workpiece W is lowered, the traveling body 11 moves in a predetermined direction while moving up and down according to the height. The vertical distance H corresponding to the working distance can be kept constant, and furthermore, since the mechanical distance of the photographing camera 3 is constant, the photographing distance from the photographing camera 3 to the work W can be kept constant.

  As a result, since it is possible to prevent the focal point of the photographing camera 3 from shifting from the work W due to the change of the photographing distance, it is possible to eliminate the blurring and inaccuracies of the planar contour image of the work W. It is possible to reduce the error between the image and the image measurement value.

  Moreover, the pair of load reducing devices 50, 50 reduce the load applied to extend the plate-like or sheet-like work W to a part of the total weight of the traveling body 11 by applying a force to pull up the traveling body 11. Therefore, it is possible to prevent overloading of the workpiece W by rolling the primary rollers 40, 40 and the secondary rollers 41, 41, and to prevent the workpiece W from being damaged by plastic deformation such as bending due to the overload. it can.

  Further, by reducing the load applied to the work W to a part of the total weight of the traveling body 11 by the pair of load reduction devices 50, 50, the work W receives an overload and causes elastic deformation such as bending or distortion. Also, distortion of the planar contour shape of the workpiece W photographed by the photographing camera 3 can be avoided. As a result, it is possible to eliminate the inaccuracies of the planar contour image of the workpiece W to be photographed by the photographing camera 3, so it is possible to reduce the error between the actual size value of the workpiece W and the image measurement value.

  Furthermore, since the pair of load reducing devices 50, 50 use the pneumatic cylinders 51, 51 which are compressible fluid pressure actuators having visco-elastic characteristics, the primary rollers 40, 40 and the secondary rollers move while the traveling body 11 moves up and down. When 41 and 41 roll on the work W, the behavior of the rollers 40, 40, 41 and 41 jumping up on the work W is suppressed by their visco-elastic characteristics, so that the respective rollers 40, 40, 41 and 41 It is possible to prevent damage such as damage to the work W due to splashing on the work W.

  Further, the work fixing device 7 adsorbs and fixes a portion of the work W located on the upstream side (left side in FIG. 1) of the traveling direction of the traveling body 11 so that the work is performed by the primary rollers 40, 40 and the secondary rollers 41, 41. When rolling the rollers 40, 40, 41, 41 on the work W while pressing the W, the work W is pulled by the movement of the traveling body 11, rubbed on the work loading surface 2, and displaced. It can prevent.

  Therefore, when photographing the workpiece W by the photographing camera 3, it is possible to prevent the planar contour image of the workpiece W from being inaccurate due to the positional deviation of the workpiece W, and as a result, the actual size value of the workpiece W and the image measurement value Can reduce the error of

  As mentioned above, although the present invention was explained based on an example, the present invention is not limited to the above-mentioned example at all, It is easy to be able to various improvement modification within the range which does not deviate from the meaning of the present invention. It can be guessed.

  For example, in the present embodiment, the pneumatic cylinder 51 is described as an example of the load reducing device 50, but such a load reducing device is not necessarily limited to the pneumatic cylinder which is a compressible fluid pressure actuator. Instead of such an air cylinder, the weight (mass) of the traveling body may be used to constitute another mass-spring-damper system. For example, the damping vibration system may be configured by combining the weight (mass) of the traveling body, a tension spring for pulling up the traveling body, and a dash pot (damper) for damping the vibration due to the tension spring.

DESCRIPTION OF SYMBOLS 1 Work reading device 2 Work loading surface 3 Shooting camera 7 Work fixing device 10 Moving support 11 Travel body 13 Drive rack (part of drive device)
19 Drive motor (part of drive unit)
20 Drive gear (part of drive unit)
40, 40 Primary roller 41, 41 Secondary roller 44 A gap of a predetermined width, a window for shooting, a window for shooting (a predetermined gap)
50, 50 Load reduction device 51, 51 Pneumatic cylinder (compressible fluid pressure actuator)
W work

Claims (4)

A flat work surface on which a flexible plate-like or sheet-like work is to be mounted, and a photographing camera for photographing and reading the planar contour shape of the work to be mounted on the work surface. A workpiece reader,
A traveling body that moves in a predetermined direction above the work surface;
A primary roller rotatably mounted on the traveling body and rolling on the workpiece along with the movement of the traveling body, with at least a part of the weight of the traveling body being applied to the workpiece as a load on the workpiece;
It is provided rotatably on the rear side in the moving direction of the traveling body with a predetermined gap from the primary roller, and is placed on the work and at least a part of the weight of the traveling body is applied to the work as a load. With the secondary roller that rolls on the work as the body moves,
It is disposed at the upper position opposite to the above-mentioned gap between the secondary roller and the primary roller, mounted on the above-mentioned traveling body with a constant distance to each roller, and the planar contour shape of the work through the gap A work reader comprising the photographing camera for photographing. A movable support which is mounted in a state of supporting the traveling body vertically movably;
A driving device for moving the movable support in the predetermined direction;
A load reduction device provided on the movable support and applying a force opposite to the acting direction of the weight of the traveling body to the traveling body to reduce the load applied to the work by the traveling body The workpiece reader according to claim 1, wherein   3. The work reading apparatus according to claim 2, wherein the load reducing device applies a force in a direction opposite to the acting direction of the weight of the traveling body by a compressible fluid pressure actuator having a visco-elastic characteristic.   It has a workpiece fixing device that adsorbs the part of the workpiece placed on the workpiece placement surface located on the upstream side in the moving direction of the traveling body to prevent the displacement of the workpiece due to the rolling movement of the primary and secondary rollers. The workpiece reader according to any one of claims 1 to 3, characterized in that:

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