JPS5838919A - Method and device for measuring shape of lens edge of spectacle frame - Google Patents

Abstract

PURPOSE:To work lenses in accordance with the digital data obtained by detecting the shape of the lens edge of spectacle frames as the digital data for the length of the distance from the temporal center in the lens edges up to the bezels of the lens edges. CONSTITUTION:When a lever 27 is moved to a solid line position, it releases a braking rod 20 from the traction effect by a spring 23, and in accordance with said release, a holding shaft 9 is moved in a left direction (a) by the repulsion effect of a spring 14 and the tip P of a contactor contacts the lens edge under light pressure. A synchronous motor 2 is driven and a detector 7 for setting the position of a reference angle detects the position of the reference angle. With this position as a starting point, the distance from the imaginary center corresponding to the angle by the power source frequency of the motor 2 is arithmetically processed by the signal transmitted from a slit type length measuring device 16, and is stored successively as digital data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention attempts to collect numerical data on the shape of the lens edge of an eyeglass frame.

Conventionally, it has been difficult to accurately determine whether the lens green of the eyeglass frame has been completed according to the desired design, either by visual measurement or by using a projector. Also,
A molding machine is used in advance to create a lens to fit into the lens rim of a glasses frame. That is, the glasses frame is fixed on the molding machine, and a contact is brought into contact with the lens rim groove, and the operation associated with the contact is made. By moving the knife up and down, a plastic model that matches the shape of the lens edge is punched out, and this is then used in a polishing machine to process the lens.

By the way, in such use, deformation of the eyeglass frame is unavoidable because pressure sufficient to overcome the feed force and back force necessary for punching is applied to the lens edge groove as contact pressure. Therefore, there is a problem with accuracy, and there is also the problem of firmly grasping the eyeglass frame and its deformation. In particular, thin frames have become popular recently.
Since it is weak in strength, it is strongly desired to solve the above-mentioned problems. On the other hand, plastic model patterns deform under the influence of temperature, humidity, etc.
There is also the disadvantage that when processing lenses using a beading machine, it is not always possible to obtain an accurate product.

The present invention aims to solve this problem, and collects the shape of the lens edge of the eyeglass frame as numerical data of the distance from the temporary center in the lens edge to the lens edge groove, and stores it in the iXc memory. The nuclear numerical data is stored as a magnetic memory, etc., and is retrieved as necessary, that is, during lens processing, so that lens processing can be performed from now on.It also checks whether the eyeglass frame is formed into the desired accurate lens edge groove. It can also be used as a check system for things like

Hereinafter, an example of implementing the present invention will be described based on the accompanying drawings.

Reference numeral 1 denotes a round table for placing eyeglass frames, which consists of an upper table 1a and a lower table 1b, both of which have a through hole S in the center.Both tables are driven by a synchronous motor 2 through a timing belt 3 It can be rotated as a unit. 4a,
&b.

Reference numeral 4C denotes an eyeglass frame holder installed on the upper table 1a so as to surround the through hole S, to which the eyeglass frame 5 is attached. 6 is a notch formed in the lower table III, and a reference angle position setting detector 1 is installed at the table position.
A raised notch 6 is provided between the upper and lower sides, and this is used to obtain a position signal to be used as a reference angle when the table rotates and collects permanent numerical data.

Reference numeral 8 denotes a contact disposed at the center position of the through hole S, and 9 is a contact holding shaft, which shaft allows the contact tip P to always follow the lens edge groove of the fixed eyeglass frame 5. In order to make contact with each other, in the illustrated example, a repelling action is applied in the left direction (A) of the arrow.

That is, 10 is a sliding rod whose tip end is pivoted in a direction perpendicular to the vicinity of the lower end of the shaft 9, and a bracket 11 fixed to the frame of the device is pivotally supported as a bearing.
The rear half is a casing 12 fixed to the bracket 11.
and a cylinder 13 which is integrally fixed with the case, and the rear end is fitted with a spring 14 within the cylinder.
It is attached to a disc 15 that has been repelled by a bullet. Thus, the sliding rod 10 is inserted into the case 12 and integrally fixes the slit type sub-length device 16, which has a large number of slits e in a direction perpendicular to the length direction of the case 12. Because it will be,
Moreover, in the case, a light emitting diode 17 is provided at the top and photodiodes 18α and 18b are provided at a constant distance from each other at the bottom in the illustrated example, so as to sandwich the sub-length device 16 from above and below.

On the other hand, 20 is a control rod for moving the holding shaft 9 in the right direction of the arrow ← against the elastic force of the spring 14, and is slidably supported on the bracket 11. , and placket) 11, and stopper plates 21a and 21b are installed at positions separated by a certain distance, and
A hook par 22 is attached to the tip and the tip of a spring 23 is locked, and the rear end is locked to a hook 24 fixed to the device frame side. On the other hand, 25 is a guide rod whose front end is fixed to the bracket 11 and whose rear end is provided parallel to the brake rod 20 on the opposite side where the holding shaft 9 is located, Arc grooves 26α and 26b are bored at 92 locations separated by a distance,
In addition, the lever 2 slides between these arcuate grooves 26a and 26b.
7, a ball 29 is provided at the post G of the lever 2, and the ball 29 is elastically repelled toward the rod shaft side via the spring 28.
are built in, and the lever positions are fixed by the balls 29 protruding into the arcuate grooves 26α and 26b, respectively.

That is, the fixed position of the lever 2f in the first illustrated example is such that the ball 29 is fitted into the groove 2εα, the boss G is in contact with the brake rod 2oQx and the flapper plate 216, and the brake rod 2 is fixed.
The sliding movement in the direction of the arrow ←) by the spring 23 of 0 is limited, and at this time, the stopper plate 21a
is located at a non-contact position in front of the claw plate M at the lower end of the holding shaft 9, separated by a certain distance.
When the ball 29 is moved and stopped in the arcuate groove 26b, the brake rod 2o is pulled by the spring 23 (the spring 23 has stronger elasticity than the spring 14) and moves to the right. On the way, the stopper plate 21α and the claw plate M at the lower end of the holding shaft 9 come into contact, and both of them move the holding shaft 9 to the right, so that the claw plate Y becomes the bracket). This is a so-called counter initial setting detector in which the initial setting of the counter is performed by inserting the claw plate M of the holding shaft 9 into the groove i.

In the operation of this device, the lever 27 is initially located at the dashed-dot line position, and at this time the claw plate M of the holding shaft 9 is fitted into the U-shaped frame of the counter initial setting detector 30 as described above. At the same time, the contact tip P is in a position where it will not get caught in the through hole S, so that the upper table 1α can be attached and detached freely. Therefore, the glasses frame that has been measured in this state can be removed together with the upper table.
The removed upper table is fixed at another location using a setting jig while centering a new eyeglass frame, and then reattached. Thus, when a new set is made,
(by moving lever 2 to the solid line position) brake rod 2
0 to release it from the traction action by the spring 23,
Along with this, the holding shaft 9 moves to the left (A) due to the elastic action of the spring 14, and the contact tip P comes into light pressing contact with the retracted lens.

Then, the synchronous motor 2 is driven, and the reference angular position setting detector 1 detects the reference angular position by the notch 6 of the rotating lower table lb. The distance from the temporary sky center corresponding to the angle determined by the power supply frequency is calculated using a signal emitted from the slit length measuring device 16, and is stored as numerical data. 31 is a control device for this purpose, and 32 is a storage device.

The operation of the above structure is shown in a block diagram as shown in FIG. 3, and the 70-chart is shown in FIG. 4.

As described above, the present invention adjusts the shape of the lens edge of the eyeglass frame so that the tip of the contact is elastically and lightly pressed into contact with the edge groove. The length of the reciprocating movement is electrically measured, collected as numerical data, and stored in IC memory, magnetic memory, etc.), so when processing the lens, the numerical data is appropriately retrieved, and from now on, the lens processing can be performed directly. Compared to the conventional method of punching out a plastic model and manufacturing it based on this, it is possible to quickly and easily produce products with extremely high precision. In addition, it can also be used as a checking system to check whether the lens edge shape is formed to the desired accurate lens edge shape during the manufacture of eyeglass frames.

[Brief explanation of the drawing]

The attached drawings show an example of an apparatus for carrying out the method of the present invention, in which Fig. 1 is a partially cutaway perspective view of the main parts of the apparatus, and Fig. 2 is a partial action explanatory diagram of the folding mechanism in which the contact holding shaft is moved. , FIG. 3 is an electrical block diagram, and FIG. 4 shows the 70-Teyart in a state where it is collected and stored as numerical data.

Claims (2)

[Claims] (1) Slowly rotate the eyeglass frame mounting table and electrically measure the distance from the temporary center inside the lens edge of the eyeglass frame to the lens edge groove to collect numerical data. ■A method for measuring the shape of the lens edge of an eyeglass frame, which is characterized in that it is memorized and stored as C memory, magnetic memory, etc. (2) The upper table and the lower table of the glasses frame mounting table with a through hole drilled in the center are rotated together by a motor, and the glasses frame is attached to the upper table. A notch is provided at one location on the outer periphery of the lower table, and a reference angle position setting detector is provided between the notches, and a contact holding shaft is inserted into the through hole. A sliding rod is attached to the holding shaft in a direction perpendicular to the lower surface of the lower table, and each time the sliding rod is pressed in the axial direction via a spring, the tip of the contact is fixed to the upper table. It is designed to be elastically inserted into the lens edge groove of the glasses frame, while an electric length measuring device is attached to the sliding rod, and a light emitting diode and a A photodiode is provided,
On the other hand, a braking rod and an actuating lever for moving the contactor holding shaft a certain distance against a spring are provided, and at the limit position of the movement, the photo range in which the initial setting of the counter is performed is as described in item 1. A device for measuring the shape of the lens edge of eyeglass frames that is directly used in the implementation of the method.