JPS6246201A - Glasses frame measuring device - Google Patents

Abstract

PURPOSE:To make it possible to measure the accurate groove shape of a glasses frame, by moving a measuring element along an engaging groove and detecting the movement thereof. CONSTITUTION:A movable stand 13 freely movable to a horizontal direction is mounted to a freely rotatable turntable 3 through a roller 12 and a freely slidable measuring rod 20 is inserted through the movable stand 13 through a bearing 19 and a measuring element 21 is mounted to the upper end thereof. Then, a glasses frame 35 is mounted to grasping devices 34 and the leading end of the measuring element 21 is matched with an engaging groove 36. Subsequently, the turntable 3 is rotated by a motor 7 to move the leading end of the measuring element 21 along the groove 36. The angle of rotation of the table 3 is detected by an angle-of-rotation detection encoder 8 and the displacement of the groove 36 is detected by a radius displacement detection encoder 16 and an up-and-down displacement detection encoder 24. Therefore, if radius displacement and up-and-down displacement are recorded so as to correspond to the detection result of the encoder 8, the shape of the groove 36 can be measured. If this measured result is reflected to the glasses lens engaging projection grinding process, a lens can be accurately engaged with any frame without readjusting the frame.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to an eyeglass frame measuring device I30 that measures the groove shape of the eyeglass frame necessary for accurately fitting the eyeglass lens into the eyeglass frame. be.

[Conventional technology] Conventionally, in order to fit eyeglass lenses into eyeglass frames,
An image mold for lens grinding is created based on a template made by copying from the frame, and the lens is ground by copying the image mold. 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.

[Problem to be solved by the invention] However, the conventional method described above has the following problems.

Eyeglass lenses and frames are usually 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 eyeglass lens and eyeglass frame are different, the frame is corrected using an A7 tool or the like 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 is troublesome, and the material and structure of the frame cannot be modified with a sturdy frame or the like.

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 rotatable turntable with a movable base movable in the horizontal direction, and a measuring rod on the movable base so as to be movable in the vertical direction. A measuring element that moves along the glasses frame fitting tM is attached to one end, and a detector is provided that can detect the rotation angle of the turntable, the horizontal movement of the movable table, and the vertical movement of the measuring stick. .

[Function] The probe moves along the fitting groove, and the groove shape is measured by detecting the movement of the probe in the horizontal direction and the vertical direction in accordance with the rotation angle.

[Example] The present invention will be described in detail below with reference to the drawings.

A post 2 is erected on a base 1, and a turntable 3 having driven teeth 4 carved on its outer periphery is rotatably supported on the guide post 2. 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 mesh with the driven teeth 4.

Two sets of roller units 11 on each side and 44 sets are attached to the turntable 3, and the rollers 12 of the roller units 11 are fitted to the rails 14 attached to the lower surface of the movable base 13 so as to be freely transferable, so that the movable base 13 is moved horizontally. It can be slid freely. Also, turn tape.

A leg stand 15 is attached to the wheel 3, a radial displacement detection encoder 16 having a vertical center of rotation is attached to the leg stand 15, and one gear 17 is attached to the axis of rotation. A rack plate 18 is fixed to a side edge of the movable base 13 parallel to the rail 14 and meshed with the gear 17. In addition, a bearing 1 is installed in the center of the movable table 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 rack teeth 22 are cut into the lower end. 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 suspension of the measuring rod 20 and the spring force of the balance spring 23 are balanced. Further, a vertical displacement detection 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 rotation 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 placed between both spring hooks 26 and 27, so that the movable base 13 is moved in the direction in which the measuring head 21 extends. to energize. 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.

Attach the case 32 to the base 1. A hole 33 is made in the upper surface of the case 32, and a frame gripper 34 is provided at the 7L33 portion, and the gripping center of the frame gripper 34 (optical center of the lens) and Align the center of rotation 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.

Attach the eyeglass frame 35 to the frame gripper 34, and fit the tip of the probe 21 i? 436.

The measuring rod 20 is maintained in its vertical position by a balance spring 23, and the measuring stylus 21 is brought into full contact with the contact pressure spring 28 while maintaining the required contact pressure.

When the turntable 3 is rotated by the motor 7, the tip of the measuring stylus 21 is guided to the full 36 and the measuring stick 20 is freely movable in the horizontal direction and the measuring rod 20 is free to move in the vertical direction. 36.

When the protrusion 29 engages with the microswitch 31, the microswitch 31 is actuated, and each encoder 8,
16. Reset the count of 24.

When the turntable 3 is further rotated in this state, the rotation angle of the turntable 3 is detected by the rotation angle detection encoder 8, and the full 36 radial displacement is detected by the radial displacement detection encoder 1.
6, the vertical displacement of the groove 36 is detected by the vertical displacement detection encoder 24, respectively.

Therefore, if the radial displacement and vertical displacement are recorded in correspondence with the detection results of the rotation angle detection encoder 8, the glasses frame 3
The shape of the groove 36 of No. 5 can be measured.

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 microswitch, and the encoder may be another detector such as a linear encoder or a magnet scale. Furthermore, the frame gripper 34 is removable from the case 32, and the glasses frame 35 can be gripped by the frame gripper 34 on a separate setting table, taking into account the position of the optical center of the lens indicated by the eye VL prescription. can.

[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, 1
3 is a movable base, 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, and 36 is a fitting groove.

Claims (1)

[Claims] 1) A movable stand is provided on a rotatable turntable so as to be movable in the horizontal direction, and a measuring rod is provided on the movable stand so as to be slidable in the vertical direction, and one end of the measuring rod moves along the eyeglass frame fitting groove. 1. A glasses frame measuring device, characterized in that a measuring element is attached to a detector capable of detecting the rotation angle of the turntable, the horizontal movement amount of the movable base, and the vertical movement amount of the measuring rod.