JP3990265B2 - Eyeglass frame shape measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spectacle frame shape measuring apparatus that automatically three-dimensionally measures the shape of a spectacle frame.
[0002]
[Prior art]
The shape measurement by the spectacle frame shape measuring apparatus is a three-dimensional measurement because the shape of the frame (rim) of the spectacle frame is generally curved along the wearer's face. Is expressed by a cylindrical coordinate system of r (displacement of the probe in the radial direction), θ (displacement in the rotation direction on the horizontal plane with respect to an arbitrary point of the probe), and Z (displacement in the height of the probe). The For this reason, the spectacle frame shape measuring apparatus includes a horizontal driving mechanism that drives the measuring element in the radial direction, a rotational driving mechanism that rotates the measuring element in a horizontal plane, and a vertical movement driving mechanism that drives the measuring element in the vertical direction. By moving along the frame groove formed on the inner peripheral surface of the rim, r, θ, and Z are measured, and the displacement is calculated to measure the rim shape (for example, , See Patent Document 1 and Patent Document 2).
[0003]
[Patent Document 1]
Utility Kaihei 6-55130
[Patent Document 2]
6-55126
[0004]
Further, when measuring the shape of the rim with the measuring element, the shape measurement of the left and right rims is sequentially performed (see, for example, Patent Document 3).
[0005]
[Patent Document 3]
Japanese Utility Model Publication No. 6-55128
[0006]
The spectacle frame holding device described in the above-mentioned Japanese Utility Model Publication No. 6-55128 measures the right rim and the left rim by moving the spectacle frame holding device that holds the spectacle frame, which is movable in the left-right direction, to the left and right. When the rim is switched, the rim is temporarily retracted downward by the driving device so that the rim does not hit the stylus.
[0007]
FIG. 13 shows a vertical movement drive mechanism of a probe used in a conventional spectacle frame shape measuring apparatus (Non-Patent Document 1).
[0008]
[Non-Patent Document 1]
HOYA frame tracer GT1000
It should be noted that the applicant has not found any prior art documents closely related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in the present specification.
[0009]
The conventional apparatus shown in FIG. 13 is configured to retract the measuring element from the loading position to the retracted position by its own weight when the holding of the measuring element by the vertical movement drive mechanism is released. In the figure, 1 is a rim of an eyeglass frame, 2 is a frame groove formed by a V-shaped groove formed on the inner peripheral surface of the rim 1, 3 is a measuring element, 4 is movable in the left-right direction and is rotatable. A rotary table 5 is a slider disposed in the rotary table 4, and 6 is a vertical movement drive mechanism for the probe 3.
[0010]
The slider 5 is connected to a motor-driven wire (not shown) and moves, and is urged in one direction by a constant load spring, whereby the measuring element 3 is moved to the frame groove 2 of the rim 1 during shape measurement. Are pressed in the radial direction with a predetermined measuring force F (for example, F = 40 g).
[0011]
The vertical movement drive mechanism 6 includes a rod 7 having the probe 3 attached to the upper end thereof, a rotation lever 8 that supports the rod 7 so as to be movable up and down, and pushes up the rotation lever 8 when measuring the shape of the rim 1. It comprises a linear stepping actuator 9 and the like. The rod 7 penetrates the slider 5 in a state where it can be raised and lowered and its rotation is restricted, and a pin 11 is rotatably provided in a middle portion via a bearing 12. A linear sensor 13 for detecting the vertical movement as the displacement (Z) in the vertical direction of the probe 3 is provided. In addition, when the rod 7 is not measured, the rod 7 is released from being held by the rotating lever 8 and is lowered to its lowest position by its own weight, and the measuring element 3 is retreated to the retreat position T which is the lowest position. .
[0012]
The rotating lever 8 is pivotally supported by a shaft 14 so as to be pivotable in the vertical direction, and a base end portion 8a is urged upward by a tension coil spring 15 to rotate counterclockwise in the drawing. Usually, the tip 8b is pressed against the upper surface of the lower plate 5A constituting the slider 5 via a buffer member 16 such as rubber, and receives and supports the pin 11 from below.
[0013]
The linear stepping actuator 9 is used to push up the probe 3 from the retracted position T to the upper loading position Td during shape measurement, and is fixed to the lower plate 5A so as to be positioned directly below the rotating lever 8. When the measurement is not performed, the screw rod 17 is retracted to the origin position (lowermost position) where it does not come into contact with the rotating lever 8. The screw rod 17 is rotated upward by energization of the actuator 9 to push up the rotating lever 8 from below. Therefore, the turning lever 8 pushes up the rod 7 via the pin 11 and moves the measuring element 3 from the retracted position T to the loading height position indicated by the two-dot chain line.
[0014]
The measurement unit including the slider 5 is moved to the left eye measurement position or the right eye measurement position by driving a motor (not shown), and then the loading of the probe 3 indicated by a two-dot chain line by another drive motor and wire drive. The contact portion 3A of the probe 3 is pressed against the groove wall of the frame groove 2 by moving to the position Rd. The slider 5 maintains a state in which the contact portion 3A is pressed against the groove wall of the frame groove 2 by a constant load spring (see FIG. 11 described later). Thereafter, the screw rod 17 is gradually lowered by the switching of the driving direction of the actuator 9 and returns to the original origin position. For this reason, the rotating lever 8 is also rotated and lowered by the urging force of the tension coil spring 15 as the screw rod 17 is lowered, and returns to the original state shown by the solid line in FIG. On the other hand, since the contact portion 3A of the probe 3 is pressed against the frame groove 2 with a predetermined measurement pressure F by the constant load spring, the rod 7 does not fall even if the support by the rotating lever 8 is lost. Then, by rotating the rotary table 4 in this state, the contact portion 3A of the probe 3 moves along the frame groove 2, and the shape (r, θ, Z) of the rim 1 is measured.
[0015]
In measuring the shape, the rotary table 4 rotates and the slider 5 moves in the horizontal direction, and the contact portion 3A of the probe 3 moves up and down along the frame groove 2 so that the slider 5 on the rotary table 4 moves. By detecting the displacement (r) in the horizontal direction, the rotation angle θ, and the displacement Z in the vertical direction of the rod 7, the rim shape is three-dimensionally measured. Further, a control method such as a pulse motor (stepping motor) can be used without providing a detection means for the rotation angle (θ) of the turntable 4.
[0016]
When the shape measurement is completed, the actuator 9 is driven to raise the screw rod 17, and the screw lever 17 pushes the rotating lever 8 to the height position of the pin 11. Next, the slider 5 is retracted, and the contact portion 3 </ b> A of the measuring element 3 is retracted from the frame groove 2. When the contact portion 3 </ b> A of the measuring element 3 is retracted from the frame groove 2, the rod 7 tends to descend due to its own weight, so that the pin 12 is supported by the rotating lever 8. Thereafter, the driving direction of the actuator 9 is switched, and the rotating lever 8 is gradually rotated and lowered by the lowering of the screw rod 17 to return to the original origin position. For this reason, the rod 7 is also gradually lowered together with the rotating lever 8, and a sudden drop is prevented.
[0017]
[Problems to be solved by the invention]
In the conventional spectacle frame shape measuring apparatus described above, the screw rod 17 is raised by driving the actuator 9 when the shape measurement of the frame groove 2 is completed and the measuring element 3 is temporarily retracted to the retreat position T below. The push lever 8 is pushed up to support the pin 11 from below. Next, the actuator 9 is driven in the reverse direction to lower the screw rod 17 so that the rod 7 is gradually lowered together with the rotating lever 8 to prevent the rod 7 from being suddenly dropped.
However, since the movable body composed of the probe 3, the rod 7, the pin 11, the bearing 12 and the like descends by its own weight and retracts the probe 3 to the retracted position T, the space between the slider 5 and the rod 7 is adopted. When the movable body is caught halfway due to friction or for some reason and stopped, the probe 3 cannot be retracted to the retracted position T, and the measurement of the rim 1 is switched by moving the rotary table 4 left or right. (For example: switching from right rim to left rim measurement), there is a problem that the rim 1 and the measuring element 3 interfere with each other and the rim 1 and / or the measuring element 3 are damaged.
[0018]
The present invention has been made in order to solve the above-described conventional problems, and the object is to forcibly retract the measuring element from the loading position to the retracted position without depending on its own weight. Eyeglasses that can be reliably retracted without stopping in the middle, and can prevent interference between the rim and the probe when changing the shape measurement of the rim by moving the probe or the spectacle frame The object is to provide a frame shape measuring apparatus.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a spectacle frame shape measuring apparatus for measuring a rim shape three-dimensionally by moving a probe along a frame groove formed on an inner peripheral surface of a rim of a spectacle frame. A Z-direction holding mechanism that holds the measuring element in a state close to no load when measuring the shape of the rim, and the measuring element when not measuring Retraction mechanism that retracts to the retreat position When With The Z-direction holding mechanism has a vertically movable rod having the measuring element at the upper end, and a balance that keeps the measuring element in a balanced state at a position slightly higher than the center position of the frame groove by pushing up the rod during shape measurement. And a spring The retracting mechanism Said Rod Said Push against the balance spring Lower A rotation lever, and a biasing spring that presses the rotation lever against the rod with a spring force larger than that of the balance spring; Said Push the rotating lever up against the biasing spring Gell With drive device for evacuation state release When the non-measurement is performed, the rotating lever is pressed against the rod by the biasing spring, and the rod is forcibly pushed down against the balance spring to retract the measuring element to the retracted position. When the loading operation is performed, the retracting state release driving device is driven to push up the rotating lever against the biasing spring, thereby setting the probe to the center position of the frame groove. The state releasing drive device is driven to push up the rotating lever against the biasing spring, and the rotating lever is separated from the rod, thereby releasing the pressing state of the rod by the rotating lever. Like It is composed.
[0020]
In the present invention, the rotating lever forcibly retracts the measuring element from the loading position to the retracted position by pushing the rod against the balance spring by the force of the biasing spring. The retracting state release driving device gradually releases the pressing state of the rod by the rotating lever by pushing up the rotating lever against the biasing spring, and stops when the frame groove and the measuring element are at the same position. Then, when the rod is released from the rotating lever, it is raised by the force of the balance spring, and the measuring element is moved from the retracted position to the loading position.
A compression coil spring, a tension coil spring, or the like is used as the balance spring and the biasing spring. As the drive device, a linear stepping actuator, a motor, or the like is used.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
1 is an external perspective view of a spectacle frame shape measuring apparatus according to the present invention, FIG. 2 is a cross-sectional view of a measuring element Z-direction holding mechanism when not measuring, and FIG. 3 is a Z-direction holding as viewed from the direction of arrow A in FIG. FIG. 4 is a side view during loading, FIG. 5 is a side view during shape measurement, FIG. 6 is a perspective view seen from the front of the slider, and FIG. 7 is an oblique view of the slider. FIGS. 8A and 8B are a perspective view of a rotary lever and an exploded perspective view of the rotary lever, and FIG. 9 is a schematic plan view showing a slider drive mechanism. 10 is a cross-sectional view taken along the line XX of FIG. 9, FIG. 11 is a view showing the contact portion of the stylus and the frame groove of the rim, and FIG. 12 is a flowchart showing the operation procedure.
[0022]
In these drawings, a spectacle frame shape measuring apparatus generally indicated by reference numeral 20 includes a housing 21 formed in a substantially rectangular parallelepiped box shape.
[0023]
The upper cover 21A that forms the upper surface of the casing 21 is provided with a switch panel 22 at the front end, and an opening 25 is formed in the center. The eyeglass frame 24 and the lens 26 to be measured from the opening 25 are provided. Alternatively, the frame mold 27 is mounted from above. A mounting bracket 29 having an L-shaped cross section is disposed on the front edge side of the opening 25. The mounting bracket 29 forms a mounting portion of the holding holder 28 used when measuring the outer peripheral shape of the lens 26 or the template plate 27 instead of the spectacle frame 24, and is usually covered with a cover 30. .
[0024]
On the other hand, in the center of the housing 21, there is a rotary table 33 that is rotatable in a horizontal plane and movable in the left-right direction. Devices 34A and 34B (FIG. 2), stylus 37 as a measuring element moving along the frame groove 36 (FIGS. 2 and 11) formed on the inner peripheral surface of the left and right rims 35A and 35B of the spectacle frame 24, and the device A control unit (not shown) for controlling the whole, a three-dimensional movement of the stylus 37, that is, an r-axis measuring device (not shown) for measuring a radial displacement r, and an arbitrary point O in the rim 35A (35B). A θ-axis measuring device (not shown) that measures a rotation angle θ that rotates in a horizontal plane around the center, a Z-axis measuring device 100 that automatically measures the vertical displacement Z, and the like are disposed.
[0025]
The switch panel 22 is provided with a start button 40, a select button 41, a reset button 42, a data button 43, an up / down button 44, an LCD display device 45, and the like. The start button 40 is a button for starting the shape measurement of the spectacle frame 24, the lens 26 or the frame template 27, and can be started when the data lamp 46 is green, and cannot be started when the data lamp 46 is red. The select button 41 is a button for selecting a condition for measuring the shape. In the case of the spectacle frame 24, the binocular → right eye → left eye, in the case of the lens 26 and the template plate 27, in the order of the right side or the left side. Measure the shape.
[0026]
When the reset button 42 is pressed during shape measurement, the measurement is stopped, the stylus 37 is returned to the origin position, and when pressed at the origin position, the origin is reset, and when waiting for data transfer, the data is cleared. When the data button 43 is pressed after the shape measurement is completed and the data lamp 46 is switched from green to red, the measurement data is automatically transferred to the processing machine or the management computer. The data lamp 46 switches from green to red after completion of the shape measurement, and indicates that the preparation for data transfer is completed. The up / down button 44 can adjust the front / rear and vertical positions of the stylus 37 in the manual mode. The LCD display device 45 displays auto, manual mode, error code, and the like.
[0027]
The spectacle frame 24 is a frame as an object to be measured, and is loaded into the housing 21 from the opening 25 so that the rims 35A and 35B are located on the lower side and the two temples 38A and 38B are located on the upper side. The left and right rims 35A and 35B are clamped by the clamping devices 34A and 34B, respectively.
[0028]
Each of the clamping devices 34A and 34B includes sliders 51A and 51B each having a clamp base 52 that is substantially the same structure and movable in the front-rear direction, and an upper case 53 that covers the clamp base 52, and the clamps are held in these sliders. Each means 54 is provided. The slider 51A on the front side and the slider 51B on the rear side are connected so as to move in the opposite directions by the same distance by a wire, and are usually held in the closest state by a constant load spring. Therefore, in this state, when one of the sliders, for example, the rear slider 51B is gripped by hand and moved rearward, the front slider 51A moves forward by the same distance in conjunction with this, and moves backward. It is separated from the slider 51B on the side. When the rear slider 51B is released from the gripping state after being moved backward, the front and rear sliders 51A and 51B are moved by the same distance in the direction approaching each other by the force of the constant load spring and returned to their original positions. To do.
[0029]
As shown in FIG. 2, the clamping means 54 is configured by two clamp pins 54 a and 54 b that are arranged to face each other in the vertical direction and operate in synchronization with a direction in which they approach and separate from each other by a cam mechanism (not shown). Has been. Further, there are a total of four clamping means 54, two in front and two in front, and two are arranged in each of the clamping devices 34A and 34B. The tip portions of the two clamp pins 54a and 54b constituting the clamping means 54 protrude outward from a long groove 56 formed in the upper case 53 in the vertical direction, and are normally held in an open state (separated state). Yes.
[0030]
When the spectacle frame 24 is mounted on the spectacle frame shape measuring apparatus 20, the pair of front and rear clamping devices 34A and 34B are separated from each other, and then the spectacle frame 24 is inserted into the housing 21 through the opening 25 to thereby form the rims 35A and 35B. Is held at a height between the upper clamp pin 54a and the lower clamp pin 54b of each clamping means 54. In this state, when the rear slider 51B is gripped by hand and moved forward, the front slider 51A moves rearward in conjunction with this, and the rims 35A and 35B are moved from the front and rear by these sliders 51A and 51B. The upper rim portion and the lower rim portion of each rim 35A, 35B are placed on the lower clamp pin 54b. When the start button 40 is pressed, the clamp pins 54a and 54b approach each other by driving a motor (not shown) to sandwich the upper and lower rim portions of the rims 35A and 35B. When the clamp pins 54A and 54b are closed and the rims 35A and 35B are clamped, the sliders 51A and 51B are positioned at the clamping positions by stoppers (not shown), so that the spectacle frame 24 is completely mounted in the casing 21. To do.
[0031]
The rotary table 33 is rotatably disposed on a slide table 60 (FIG. 2) that can reciprocate in the left-right direction, and is not shown when measuring the shape of the spectacle frame 24, the lens 26, or the frame template 27. The rotation direction of the stylus 37 in the horizontal plane is measured by a θ-axis measuring device (not shown) which rotates the rotation table 33 at this time by a pulse motor, and the rotation angle of the rotation table 33 (actually, the number of pulses supplied to the motor) not shown. The displacement (θ) is detected. A radial long groove 61 passing through the center of the rotary table 33 is formed in correspondence with the stylus 37.
[0032]
The slide table 60 is connected to a DC motor (not shown) via a wire, and when the shape of the left rim 35A, lens 26 or frame template 27 is measured, the right rim 35B, lens 26 or frame is on the left. It is configured to be moved to the right side when measuring the shape of the template 27.
[0033]
A slider 62 is disposed inside the rotary table 33. The slider 62 includes an upper plate 63 and an upward U-shaped lower plate 64 screwed to the lower surface side of the upper plate 63, and holds the stylus 37 in a state close to no load so that the stylus 37 can move up and down. A Z-direction holding mechanism 66 and a retracting mechanism 67 for retracting the stylus 37 to a lowermost position, that is, a retracted position T indicated by a solid line in FIG.
[0034]
The slider 62 is disposed in the rotary table 33 so as to be movable in the longitudinal direction of the long groove 61, and is urged in one direction (arrow C direction) by a constant load spring 70 as shown in FIGS. A slider fitting 71 is fixed to one side surface. The urging force of the constant load spring 70 is also controlled by the movement of the motor drive control wire 72 disposed on the side surface of the slider 62. That is, a stopper fitting 73 is fixed to the wire 72, and the stopper fitting 73 is interlocked with the movement of the wire 72 and is positioned in front of the moving direction of the slider fitting 71. Therefore, when the normal slider 62 is urged by the constant load spring 70, the slider fitting 71 is in contact with the stopper fitting 73 of the wire 72, and the movement of the slider 62 is restricted by the stopper fitting 71 of the wire 72. Will be. The wire 72 stretched between the two pulleys 75 and 75 moves when the motor 74 rotates, and accordingly, the stopper fitting 73 also moves, and the slider 62 also moves simultaneously. However, when the contact portion 37C of the stylus 37 contacts the frame groove 36, the slider 62 stops in a state where the urging force of the constant load spring 70 is received at that position (measurement start state).
[0035]
On the other hand, since the motor 74 continues to rotate and the wire 72 is moving, the stopper fitting 73 moves away from the slider fitting 71 and moves alone, and is a photosensor disposed on the biasing direction side. When detected by 76, the motor 74 is stopped, which is the retracted position of the stopper fitting 73. Then, the measurement is started, and when the measurement is completed, the operation is returned by the reverse operation. The radial displacement r of the slider 62, that is, the horizontal distance from an arbitrary point O in the rim 35A (35B) to the contact point P (FIG. 1) where the stylus 37 contacts the frame groove 36 is not shown. It is measured by an r-axis measuring device (for example, see Patent Documents 1 and 2 and Non-Patent Document 1). 9 and 10, reference numeral 77 denotes a slide shaft (guide bar) of the slider 62.
[0036]
[Non-Patent Document 1]
Frame tracer GT1000 made by Hoya Co., Ltd.
[0037]
The stylus 37 is attached to the upper end of a rod 65, which is a component of the Z-direction holding mechanism 66, and has an L-shaped main body 37A and an elongated shape protruding horizontally at the upper end of the main body 37A. The pin 37B comprises a tip 37B, and the tip of the pin 37B forms a contact portion 37C, which is sequentially inserted into the frame groove 36 of the rims 35A and 35B, and is pressed against the groove wall with a predetermined measurement pressure F. Further, as shown in FIG. 11, the contact portion 37C is formed in a hemispherical shape having a spherical diameter D of 1.6 mm <D <2.2 mm.
[0038]
The reason why the spherical diameter D of the contact portion 37C is set to 1.6 mm <D <2.2 mm is that the stylus 37 is used even if the opening angle α (FIG. 11) is a frame groove 36 different from 110 °, 100 °, and 90 °. The contact portion 37C can be reliably measured without being detached from the frame groove 36, and a bevel V of 120 ° can be obtained regardless of whether the opening angle α is 110 °, 100 °, or 90 °. The center O of the contact portion 37C from the bevel apex S when in contact with the frame groove 36 ₀ This is to make the distance R up to approximately equal. In this way, it is not necessary to measure the opening angle α according to the frame groove 36, and it is only necessary to correct the measured value by adding a fixed correction value to the measured value regardless of the opening angle α.
[0039]
The Z-direction holding mechanism 66 includes the rod 65 having the stylus 37 attached to the upper end thereof, and a balance spring 80 that pushes the rod 65 upward and holds the stylus 37 in a state close to no load. Yes. The rod 65 passes through a long groove 61 of the rotary table 33 and an insertion hole formed in the upper plate 63 so as to freely move up and down, and a plate 81 is fixed to the lower end.
[0040]
The rod 65 is biased upward by the balance spring 80, but normally the stylus 37 is retracted to the retracted position T by being pushed downward by the retracting mechanism 67 as shown in FIG. When released from the retracting mechanism 67 when measuring the shape of the spectacle frame 24, it is pushed up and held at the height position where the axis of the contact portion 37C of the stylus 37 faces the frame groove 36 of the rim 35A (35B), ie, the loading position Rd. It is configured to be.
[0041]
In other words, in the present embodiment, the movable body 85 that is movable up and down and is configured by the stylus 37, the rod 65, the plate 81, the pin 96 described later, the sensor rod 102, and the like is raised by the urging force of the balance spring 80, and the stylus. When 37 moves to the upper loading position Rd, the spring force of the balance spring 80 is set so that the weight of the movable body 85 and the biasing force of the balance spring 80 maintain a predetermined balance, and the movable body 85 is close to no load. The shape is measured while maintaining the state. In this case, it is preferable to make the weight of the movable body 85 equal to the spring force of the balance spring 80 so that no load is applied. However, in reality, there are problems with the accuracy and durability of the balance spring 80 (strictly set, the spring If there is an error in the accuracy of itself, the error cannot be absorbed), so that the spring force of the balance spring 80 is set slightly larger than the weight of the movable body 85.
[0042]
The retracting mechanism 67 includes a linear stepping actuator 90 as a retracting state release driving device having a screw rod 91 that can move up and down and fixed on the lower plate 64, and a rotating lever that is rotated by the actuator 90. 92 and an urging spring 93 composed of a tension coil spring for urging the rotating lever 92 counterclockwise in FIG. The upper end of the biasing spring 93 is connected to the rotation lever 92, and the lower end is connected to the horizontal bottom plate portion of the lower plate 64.
[0043]
As shown in FIG. 8, the rotating lever 92 is formed by two lever members 92A and 92B which are formed by bending a metal plate and are integrally coupled by a set screw (not shown). One lever member 92A extends to one side edge of the horizontal plate portion 92A-1a and a lever body 92A-1 having a reverse L-shape in side view, which is composed of a horizontal plate portion 92A-1a and a vertical plate portion 92A-1b. The contact piece 92A-2 with which the threaded rod 91 can come into contact, and the fixed piece 92A-3 suspended from the lower surface of the horizontal plate portion 92A-1a. Two screw holes 92C are formed in the fixing piece 92A-3.
[0044]
The other lever member 92B has a plate-like main body 92B-1 that can be brought into contact with the pin 96 projecting near the lower end portion of the rod 65 from the upper side. 92B-1 is composed of a fixed piece 92B-2 suspended from the rear end edge of the base end side and a pair of left and right bent pieces 92B-3 suspended from both side edges of the base end side of the main body 92B-1. ing. The fixing piece 92B-2 has two screw attachment holes 92D, and is fixed to the fixation piece 92A-3 by screwing a set screw inserted into the screw attachment holes 92D into the screw hole 92C. . Each of the pair of bent pieces 92B-3 has an insertion hole 92E.
[0045]
Such a rotation lever 92 is pivotally supported by a shaft 95 inserted through the insertion hole 92E of the pair of bent pieces 92B-3 so as to be rotatable in the vertical direction, and as shown in FIG. When the main body 92B-1 is pressed against the pin 96 from above by the spring force of the biasing spring 93, the rod 65 is pushed down against the balance spring 80 and the stylus 37 is retracted to the retracted position T. ing. At this time, the screw rod 91 is lowered to the origin position. The spring force of the biasing spring 93 is set larger than the spring force of the balance spring 80.
[0046]
Below the actuator 90, an origin sensor 97 (FIG. 3) for detecting the screw rod 91 is disposed. The origin sensor 97 is one in which the contact piece 92A-2 is turned on and off by the screw rod 91. When the screw rod 91 is at the origin position, the contact sensor 92A-2 is maintained in the ON state, and the screw rod 91 is raised by driving the actuator 90. Then it switches to OFF.
[0047]
When the screw rod 91 is rotated and raised by energizing the actuator 90 during the measurement of the shape of the spectacle frame 24, the abutting piece 92A-2 of the rotating lever 92 resists the tension of the biasing spring 93 by the screw rod 91. The actuator 90 is temporarily stopped and held at its height position by the screw rod 91 when it is rotated clockwise by being pushed up and becomes substantially horizontal. 3 and 4 show the state at this time. That is, when the rotation lever 92 is rotated in the clockwise direction, the main body 92B-1 is also rotated in the same direction, so that the rod 65 is gradually raised by the urging force of the balance spring 80. The position where the actuator 90 stops is the loading position Rd. The loading position Rd is also the center position of the frame groove 36. When the stylus 37 is inserted into the frame groove 36, the screw rod 91 is further raised, the contact piece 92 </ b> A- 2 is rotated to the retracted position in the upper oblique direction, and the stylus 37 is moved up and down from the rotation lever 92. When driving in the direction, it becomes a free state that is not affected at all, and measurement is started (see FIG. 5).
[0048]
In a state where the rod 65 is released from the rotation lever 92 and stopped at the upper position, the pin 96 is positioned sufficiently below the contact piece 92B-1 to allow the rod 65 to move up and down. That is, the rod 65 is completely separated from the rotary lever 92 during shape measurement, and is maintained in a vertically movable state to enable measurement of the displacement Z in the vertical direction.
[0049]
The position where the weight of the movable body 85 and the urging force of the balance spring 80 maintain a balanced state is a position that is about 1 to 5 mm higher than the loading position Rd of the stylus 37 (the same position as the center of the frame groove 36). The displacement Z in the height direction of the stylus 37 at the time of measurement is about ± 10 mm.
[0050]
The reason why the height position maintaining the balanced state and the position of the frame groove 36 are not completely matched in the present embodiment is due to consideration of changes over time such as parts including the balance spring 80, assembly errors, etc. By setting the balance spring 80 in a slightly pressed state, there remains room for position adjustment. That is, ideally, when the contact portion 37C of the stylus 37 is engaged with the frame groove of the rim, the load in the Z-axis direction is preferably in an unloaded state. However, because of the structure, it is difficult to adjust the position further upward from the position when the spring is fully extended, and the position adjustment is easy when the spring is pressed.
[0051]
Thus, when switching from the measurement state to the non-measurement state, when the rod 65 is forcibly lowered by the retracting mechanism 67 and the stylus 37 is retracted from the loading position Rd to the retracted position T, the rod 65 is moved halfway due to friction or the like. The stylus 37 can be reliably retracted to the retracted position T without stopping and moving.
[0052]
On the upper surface of the plate 81, the Z-axis measuring device 100 for measuring the vertical displacement Z of the stylus 37 is provided. This Z-axis measuring apparatus 100 is well known in the art, and a ring-shaped sensor head 101 provided on the lower surface side of the upper plate 63 via an L-shaped metal fitting 104, and the inside of the sensor head 101 move up and down without contact. The sensor rod 102 penetrates freely. The sensor head 101 is configured by arranging nine flat coils in the axial direction, and five coils of odd numbers (1, 3, 5, 7, 9) are primary excitation coils, and even numbers (2, 4, 6). , 8) form secondary induction coils. The sensor rod 102 is formed by alternately arranging a plurality of magnetic spheres and non-magnetic spheres in a cylinder made of a non-magnetic material such as SUS303, and is erected vertically on the plate 81. When the sensor rod 102 is displaced in the vertical direction together with the rod 65, an induced voltage is generated in the induction coil of the sensor head 101, and the induced voltage is detected and signal-processed to detect the vertical displacement of the sensor rod 102 in the stylus. 37 is configured to detect the displacement Z in the vertical direction. On the other hand, the balance spring 80 is elastically mounted between the lower surface of the plate 81 and the lower plate 64.
[0053]
Further, the slider 62 is provided with a measuring rod 108. The measuring rod 108 is used as a measuring element when measuring the outer peripheral shape of the lens 26 or the template plate 27, and penetrates through a cylindrical body 109 provided on the upper plate 63 so as to freely move up and down. The upper end is located in the vicinity of one end portion just below the long groove 61 of the rotary table 33, is biased upward by the tension coil spring 110, and is prevented from rotating by the anti-rotation pin 111. The rotation-preventing pin 111 protrudes from the outer peripheral surface of the lower end portion of the measuring rod 108, and the distal end portion is slidably inserted into a vertically long slit 112 formed in the vertical plate portion of the lower plate 64. ing.
[0054]
The measuring rod 108 has a pin-shaped operating member 114 for turning on and off the limit switch 113 and is normally held at the lowest position by a push latch 115. The push latch 115 holds the measuring rod 108 when operated once, releases the held state when moved twice, and shifts to the measuring state, and a commercially available one is used. When the measuring rod 108 is pushed down, the holding state of the measuring rod 108 by the push latch 115 is released, so that the measuring rod 108 is pulled up by the tension coil spring 110 and can be brought into contact with the lens 26 or the template plate 27. Move to position RdO. In this case, unlike the shape measurement of the rims 35A and 35B, the shape measurement of the lens 26 and the template plate 27 is a two-dimensional measurement, that is, the measurement of the radial displacement r and the rotation angle θ. The measurement may be performed in a state where the anti-rotation pin 111 is pressed against the upper end wall of the slit 112 without being held in a floating state.
[0055]
The limit switch 113 is for detecting the use / non-use state of the measuring rod 108. When the measuring rod 108 is lowered to the lowest position and is held by the push latch 115, the movable piece 113a is used. Is held in the OFF state by being pressed and rotated by the operation member 114, and is switched to the ON state when the measuring rod 108 is lifted and the pressing state of the movable piece 113 a by the operation member 114 is released. Has been.
[0056]
Next, the operation procedure of the spectacle frame shape measuring apparatus 20 having the above structure will be described based on the flowchart shown in FIG.
First, the power is turned on (step 200). Next, when measuring the shape (frame trace) of the rims 35A and 35B (step 201), the spectacle frame 24 is inserted into the housing 21 through the opening 25, and the rim 35A is inserted by the pair of clamping devices 34A and 34B. , 35B. Then, the shape measurement conditions are set by the select button 41 (step 202). Next, the start button 40 is operated to sequentially measure the shapes of the rims 35A and 35B (step 203). In the measurement state, the data button 43 is lit in green. When the shape measurement is finished, the data button 43 changes from green to red to notify that the measurement is finished. The measurement data of the rims 35A and 35B whose shape has been measured is automatically transferred to a processing machine or a management computer (step 205).
[0057]
Next, when measuring the shape (pattern trace) of the frame template 27 (step 206), the frame template 27 is attached to the holding holder 28 (step 207). Next, the cover 30 is removed, and the holding holder 28 is positioned and fixed on the mounting bracket 29 (step 208). The shape measurement conditions (right side, left side) are set by the select button 41 (step 209). Next, the measuring rod 108 is set and the start button 40 is operated to measure the shape of the frame template 37 (step 210). Thereafter, the shape measurement of the frame template 27 is completed through the above-described step 203-step 204-step 205.
[0058]
Next, when measuring the shape of the lens 26 (lens trace) (step 211), the lens 26 is attached to the holding holder 28 (step 212). Next, the cover 30 is removed, and the holding holder 28 is positioned and fixed on the mounting bracket 29 (step 213). Thereafter, the shape measurement of the lens 26 is finished through the above-described step 209-step 210-step 203-step 204-step 205.
[0059]
【The invention's effect】
As described above, the eyeglass frame shape measuring apparatus according to the present invention retracts the probe from the loading position to the retracted position by forcibly lowering the rod by the retracting mechanism when switching from the measurement state to the non-measurement state. Since the rod is not stopped due to friction or the like and does not move due to friction or the like, the measuring element can be reliably retracted to the retracted position. In addition, the structure of the retracting mechanism is simple.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a spectacle frame shape measuring apparatus according to the present invention.
FIG. 2 is a cross-sectional view of a measuring element in a Z-direction holding mechanism when not measuring.
3 is a cross-sectional view of the Z-direction holding mechanism when loading the frame groove as viewed from the direction of arrow A in FIG.
FIG. 4 is a side view at the time of loading.
FIG. 5 is a side view at the time of shape measurement.
FIG. 6 is a perspective view of the slider as viewed from the front.
FIG. 7 is a perspective view of the slider as viewed obliquely from the front.
FIGS. 8A and 8B are a perspective view of a rotating lever constituting a retracting mechanism and an exploded perspective view of the rotating lever.
FIG. 9 is a schematic plan view showing a slider driving mechanism.
10 is a cross-sectional view taken along line XX in FIG.
FIG. 11 is a view showing a contact portion of a stylus and a frame groove of a rim.
FIG. 12 is a flowchart showing an operation procedure.
FIG. 13 is a cross-sectional view of a conventional vertical drive mechanism.
[Explanation of symbols]
24 ... Eye-eye frame, 35A, 35B ... Rim, 36 ... Frame groove, 37 ... Stylus (measuring element), 37C ... Contact part, 62 ... Slider, 65 ... Rod, 66 ... Z direction holding mechanism, 67 ... Retraction mechanism, 80 ... balance spring, 90 ... linear stepping actuator, 92 ... rotating lever, 93 ... biasing spring.

Claims (1)

In the spectacle frame shape measuring apparatus for measuring the rim shape three-dimensionally by moving the probe along the frame groove formed on the inner peripheral surface of the rim of the spectacle frame,
A Z-direction holding mechanism for holding the measuring element in a state close to no load when measuring the shape of the rim;
And a retracting mechanism for retracting to the retracted position the measuring element at the time of non-measurement,
The Z-direction holding mechanism has a vertically movable rod having the measuring element at the upper end, and a balance that keeps the measuring element in a balanced state at a position slightly higher than the center position of the frame groove by pushing up the rod during shape measurement. And a spring
The retraction mechanism includes a rotating lever to lower press against the rod in said balance spring, a biasing spring for pressing the rod the pivot lever has a greater spring force than the balance spring, the the pivoting lever and a on the gel retracted state release driving device pushing against the biasing spring,
At the time of non-measurement, by pressing the rotating lever against the rod by the biasing spring, the rod is forcibly pushed down against the balance spring and the measuring element is retracted to the retracted position,
At the time of loading, by driving the retracting state release driving device and pushing up the rotating lever against the biasing spring, the measuring element is set to the center position of the frame groove,
At the time of shape measurement, the retracting state release driving device is driven to push up the rotating lever against the biasing spring, and the rotating lever is separated from the rod, thereby the rotating lever An eyeglass frame shape measuring apparatus , wherein the pressing state of the rod is released .

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