JPH0588402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an eyeglass frame measuring device for measuring the groove shape of an eyeglass frame necessary for accurately fitting an eyeglass lens into an eyeglass frame.

〓Conventional technology〓 Conventionally, in order to fit eyeglass lenses into eyeglass frames, a model mold for lens grinding is made based on a template made from the frame, and the lens is ground following the pattern. There is. In this case, the radial direction can be ground accurately to match the frame, but for changes in the thickness direction of the lens, regardless of the groove shape of the eyeglass frame, the lens curve is a forced imitation curve or lens base curve. Grinding with.

<Problems to be Solved by the Invention> However, the above conventional method has the following problems.

Eyeglass lenses and frames are often made with 5 to 6 curves, but the curves are not necessarily constant.Furthermore, the curve of the fitting protrusion formed by grinding around the eyeglass lens is also intentionally made with 5 to 6 curves depending on the shape of the lens or frame. Sometimes it is removed from Therefore,
If the curves of the spectacle lens and the spectacle frame are different, the frame is corrected using a tool such as a tool to match the curve of the fitting protrusion formed by grinding in order to fit them together accurately.

For this reason, there is a problem that fitting the eyeglass lenses and the eyeglass frame becomes troublesome, and correction cannot be made depending on the material and structure of the frame or the robustness of the frame.

In view of this situation, the present invention attempts to measure the accurate groove shape of the eyeglass frame required in the eyeglass lens grinding process so that the eyeglass lens can be fitted without modifying the eyeglass frame. It is something to do.

<Means for Solving the Problems> The present invention provides a turntable rotatably disposed on a base, a movable base disposed on the turntable so as to be movable in the horizontal direction, and the movable base. a measuring rod that is vertically slidably and non-rotatably inserted into an upright bearing; and a measuring rod that is attached to the tip of the measuring rod so as to extend in the direction of movement of the movable base, and that is attached to a frame gripper. a measuring tip whose tip can come into contact with the fitting groove of the eyeglass frame; a balance spring that supports the weight of the measuring rod and the measuring tip; and a tip of the measuring tip with a required contact pressure against the fitting groove of the glasses frame. a contact pressure spring that urges the movable base in the extending direction of the gauge head so as to contact the movable base; a rotation angle detector that detects the rotation angle of the turntable; and a radial displacement detector that detects the amount of horizontal movement of the movable base. and a vertical displacement detector for detecting the amount of vertical movement of the measuring rod.

〓Operation〓 When the turntable is rotated with the tip of the probe in contact with the fitting groove of the glasses frame attached to the frame gripper, the probe moves along the fitting groove and detects the rotation angle. The rotation angle of the turntable is detected by the instrument, the amount of horizontal movement of the movable base is detected by the radial displacement detector, and the amount of vertical movement of the measuring rod is detected by the vertical displacement detector. By recording the amount of horizontal movement and the amount of vertical movement, the shape of the fitting groove of the eyeglass frame is measured.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

A post 2 is installed upright on a base 1, and driven teeth 4 are installed on the outer periphery.
The turntable 3 engraved with the guide post 2
It is rotatably supported. Support stands 5 and 6 are also attached to the base 1, and a rotation motor 7 and a rotation angle detection encoder 8 are attached to the support stands 5 and 6, respectively, so that the axis of rotation is vertical, and a pinion is attached to each axis of rotation. 9 and 10 are attached to the driven tooth 4.
It meshes well.

Two sets of roller units 11 are attached to the turntable 3 on each side, a total of four sets, and the roller units 11 are attached to the turntable 3.
The rollers 12 of the movable table 13 are fitted in a rail 14 attached to the lower surface of the movable table 13 so as to be able to roll freely, so that the movable table 13 can freely slide in the horizontal direction. Further, a leg stand 15 is attached to the turntable 3, and a radial displacement detection encoder 16 having a vertical rotation center is attached to the leg stand 15.
is attached, and a gear 17 is fitted to its rotating shaft.
A rack plate 18 is fixed to the side edge of the movable table 13 parallel to the rail 14 and meshed with the gear 17. Further, a bearing 19 is installed in the center of the movable base 13,
A measuring rod 20 is slidably but non-rotatably inserted into the bearing 19, a measuring element 21 is attached to the upper end of the measuring rod 20, and a rack tooth 22 is carved at the lower end. Measuring stick 2
The lower end of the measuring rod 20 and the lower surface of the movable base 13 are connected by a balance spring 23, and the weight of the measuring rod 20 and the spring force of the balance spring 23 are balanced. Further, a vertical displacement detecting encoder 24 is attached to the lower surface of the movable base 13, and a pinion 25 that meshes with the rack teeth 22 is fixed to the rotating shaft of the encoder 24. Spring hooks 26 and 27 are installed on the upper surface of the turntable 3 and the lower surface of the movable base 13, respectively, and a contact pressure spring 28 is installed between both spring hooks 26 and 27.
and biases the movable base 13 in the direction in which the probe 21 extends. Further, a protrusion 29 is provided on the lower surface of the turntable 3, and a reference point microswitch 31 is attached to the base 1 via a metal fitting 30, so that the metal fitting 30 and the microswitch 31 can be engaged with each other.

A case 32 is attached to the base 1. A hole 33 is bored in the upper surface of the case 32, a frame gripper 34 is provided in the hole 33, and the gripping center (optical center of the lens) of the frame gripper 34 is aligned with the rotation center of the turntable 3.

In the figure, 35 is an eyeglass frame, and 36 is a fitting groove of the eyeglass frame.

Next, the operation will be explained.

The eyeglass frame 35 is attached to the frame gripper 34, and the tip of the probe 21 is aligned with the fitting groove 36. The vertical position of the measuring rod 20 is maintained by a balance spring 23, and the measuring rod 21
The contact pressure spring 28 maintains the required contact pressure to contact the groove 36.

When the turntable 3 is rotated by the motor 7, the movable base 13 can move freely in the horizontal direction, and the measuring rod 20 can freely move in the vertical direction, so that the tip of the measuring tip 21 is guided by the groove 36. move along.

The engagement of the protrusion 29 with the microswitch 31 activates the microswitch 31 and resets the count of each encoder 8, 16, 24. When the turntable 3 is further rotated in this state, the rotation angle of the turntable 3 is determined by the rotation angle detection encoder 8, the radial displacement of the groove 36 is determined by the radial displacement detection encoder 16, and the vertical displacement of the groove 36 is determined by the vertical displacement. Each is detected by the detection encoder 24.

Therefore, the shape of the groove 36 of the eyeglass frame 35 can be measured by recording the radial displacement and vertical displacement in correspondence with the detection result of the rotation angle detection encoder 8.

Incidentally, depending on the mounting condition of the eyeglass frame in the vertical displacement measurement, the groove may protrude beyond the lens curve, but this can be easily corrected by calculating the measurement results, and the groove shape can be measured without error. Furthermore, when performing such calculations, the rotation center of the turntable and the optical center do not necessarily have to coincide.

If the result of measuring the groove shape of the eyeglass frame is reflected in the fitting protrusion grinding process of the eyeglass lens, the eyeglass lens can be accurately fitted into any eyeglass frame.

In the above embodiment, a proximity switch may be used instead of the micro switch, and the encoder may be another detector such as a linear encoder, a magnescale, etc. Additionally, a frame gripper 34
is removable from the case 32, and allows the frame holder 34 to hold the eyeglass frame 35 on a separate setting table, taking into consideration the position of the optical center of the lens specified by the eyeglass prescription.

Effects of the Invention As described above, according to the present invention, the shape of the fitting groove of the eyeglass frame can be accurately measured, so the lens can be ground to match the eyeglass frame, and the eyeglass lens can be modified into the eyeglass frame. It is possible to fit accurately without any problems. You can also measure frame curves.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a front side view of the same. 3 is a turntable, 8 is a rotation angle detection encoder, 13 is a movable table, 16 is a radial displacement detection encoder, 20 is a measuring rod, 21 is a measuring head, 24 is a vertical displacement detection encoder, 35 is a glasses frame, 36
indicates a fitting groove.

Claims (1)

[Claims] 1. A turntable rotatably disposed on a base, a movable base disposed on the turntable so as to be movable horizontally, and a movable base movable vertically on a bearing installed on the movable base. A measuring rod is inserted through the measuring rod in a non-rotatable manner, and the measuring rod is attached to the tip of the measuring rod so as to extend in the moving direction of the movable base, and the tip can come into contact with the fitting groove of the eyeglass frame attached to the frame gripper. A measuring element, a balance spring that supports the weight of the measuring rod and measuring element, and a movable base that is moved in the extending direction of the measuring element so that the tip of the measuring element contacts the fitting groove of the eyeglass frame with the required contact pressure. a contact pressure spring that biases the turntable; a rotation angle detector that detects the rotation angle of the turntable; a radial displacement detector that detects the amount of horizontal movement of the movable table; and a radial displacement detector that detects the amount of vertical movement of the measuring rod. An eyeglass frame measuring device characterized by comprising a vertical displacement detector.