JPS61156022A - Automatic spectacle lens grinder - Google Patents

Abstract

PURPOSE:To attain extremely fine ridgeline forming work by calculating a ridgeline deflection value every rotational angle of a lens and moving the lens on the basis of the ridgeline deflection value. CONSTITUTION:A frame inner diameter measuring instrument 2b has a probe 28 to be turned while abutting upon a circular inside groove 27 of a frame fixed on the instrument 26 and a rotary encoder 29 for detecting the rotational angle theta of the prove 28 and a distance (inner diameter) R between the rotational center O1 of the prove 28 and the groove 27 is supplied to an arithmetic unit 30 as an electric signal together with the rotational angle theta. The arithmetic unit 30 stores the inner diameters R corresponding to respective rotational angles theta (theta=1-360 deg.) in a measuring table T1 of a memory and calculates the value epsilon. The value epsilon corresponds to the moving distance of the lens in the axial direction at the time of ridgeline forming work and a pulse motor 23 is controlled by the value epsilon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automatic eyeglass slipping device that can fully automatically process the lenses of eyeglasses.

(Conventional technology) To manufacture eyeglasses, first a template is made that has the same shape as the lens shape of the eyeglass frame, and after roughening the lenses, a chevron-shaped bevel is formed around the lens periphery. The lens must be beveled, and the beveled lens must be fitted into the frame of the frame.

FIGS. 11 to 13 show an example of a conventional apparatus for performing such lens processing, and are taken from Japanese Utility Model Publication No. 58-46906. In these figures, an arm 2 and a head 3 are rotatably supported on a support shaft 1. The support arms 4, 4 of the head 3 are provided with a chuck shaft 6 for clamping the lens 5 and a chuck operation shaft 7, and the chuck shaft 6 is driven by a rotation mechanism (not shown) built into the head 3. It rotates together with the lens at a slow speed of about 1 revolution per minute. The lens 5 is then brought into contact with a grindstone 8 that rotates at high speed and is ground.

In this case, a template 9 having the same shape as frame type 1 is attached to the chuck shaft 6, and rotates while contacting a guide plate 10 fixed to the arm 2, which causes the head 3 to swing up and down. By moving, the lens 5 is ground into the same shape as the template 9.

When the roughening of the lens 5 is completed, the lens 5 is brought into contact with a grindstone having a groove for beveling, and a bevel is formed on the peripheral edge of the lens 5. This bevel is to prevent the lens 5 from falling out of the frame when it is inserted into the frame.

[Problem that the invention seeks to solve]

By the way, in order to fit the lens processed using the above-mentioned conventional device into the inner groove of the lens shape of the frame, a technique is required to process the lens while delicately adjusting the position of the bevel, which requires a high degree of skill. did.

In view of the above-mentioned circumstances, it is an object of the present invention to provide an eyeglass store machine that can fully automatically carry out delicate processing.

Means for Solving Problem C] In order to solve the above problems, the present invention (a) traces the lens-shaped inner groove of the frame with a contact, and aligns the rotation center of the contact with the lens-shaped inner groove. (b) a measuring means for outputting the distance between the contacts as a first inner diameter along with the rotation angle of the contact; (b) based on the rotation angle of the contact, the first inner diameter, and the pupil distance input from the operation switch; After determining the optical centering point of the first type and calculating the distance from this optical centering point to the inner groove of the lens shape as the second inner diameter, the second inner diameter and the input from the operation switch are calculated. (C) a beading machine having a first moving means for moving a lens in a radial direction and a second moving means for moving the lens in an axial direction; (d) A control means for driving and controlling the first and second moving means based on the bevel value to apply bevel processing to the lens.

[Effect]

According to the above configuration, the bevel number is calculated for each rotation angle of the lens, and the lens is delicately moved based on this bevel value, so extremely fine bevel processing is possible.

Furthermore, this processing is fully automatic and does not require any skill. Furthermore, since the center of the bevel processing becomes the center of the second inner diameter, that is, the optical centering point (which coincides with the optical center of the lens), it is possible to prevent the lens from shifting during processing. This is because, in the present invention, the center of the spherical lens surface is firmly pressed and mounted. Note that conventionally, the geometric center point of frame type 1 (
This is generally different from the optical centering point), so there was a risk that the lens would shift.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 4, the chuck shaft 6 is rotated at low speed by a rotation mechanism 11 built into the support arm 4. As shown in FIGS. This rotation mechanism 11 includes a deceleration mechanism 12 and a motor 1 that drives the deceleration mechanism 12.
3 and a rotary encoder 14 that detects the amount of rotation of the chuck shaft 6.
The rotation angle Lθ is supplied to the control device 32 in FIG.

Furthermore, a moving mechanism 16 for controlling the vertical movement of the head 3 is provided on the outer side of the support arm 4. This moving mechanism 16 includes a vertically erected feed shaft 17, a regulating member 18 coupled thereto, and a pulse motor 19 that moves the regulating member 18 in the vertical direction by rotating the feed shaft 17. The regulating member 18 comes into contact with a stopper 20 formed on the outer surface of the support arm 4, thereby regulating the vertical movement of the head 3. That is, the moving mechanism 16 and the stopper 20 perform the functions corresponding to the template 9 and the guide plate 10 of the conventional device.

Next, a screw thread is cut into the support shaft 21, and a feeding member 22 fixed to the head 3 is engaged with this thread. Therefore, when the spindle 21 is rotated by the pulse motor 23, the head 3 moves in the direction of the arrow YY in FIG. The relative position between the two is shifted. Note that the above-mentioned components 21 to 23 constitute a moving mechanism 24.

The above is the configuration of the boarding house Ia25 according to this embodiment.

Next, FIG. 4 is a block diagram showing the electrical configuration for controlling this ball M machine 25. In this figure, 26
' is a frame inner diameter measuring device, and a contact 28 that rotates in contact with a lens-shaped inner groove 27' (Fig. 5) of a frame attached and fixed to this device, and a rotation angle θ of this contact 28 are measured.
It has a rotary encoder 29 that detects the contact 2.
Distance between rotation center 0+ of 8 and lens inner groove 27 (inner diameter)
R, along with the rotation angle θ, is supplied as an electrical signal to the arithmetic unit 30 in FIG. Note that a measuring signal indicating that the inner diameter R is being measured is also supplied to the calculation device 30.

The arithmetic device 30 calculates each rotation angle θ (θ−1°).

2°...360°) is stored in the measurement table T1 in the memory, and the following calculations are performed.

(1) Calculation of the geometric center point M (Mx, My) of type 1 (Fig. 6).

The calculation device 30 calculates the geometric center point M (
Mx, My) are determined by the following formula.

Mx = ((Rcosθ) may, −(Rcos
θ)min)/2 ・・・・・・・・・
...(1) My = ((Rsinθ) w+ax −
(Rsinθ)min)/2...
・・・・・・・・・(2) However: (R cos θ) wax:
Horizontal maximum value (Rcosθ) 1n; horizontal minimum value (Rsinθ) a+aX: horizontal maximum value (Rsinθ
) 1n; Vertical minimum value (2) Calculation of the inner diameter P from the geometric center point M (Mx, My) to the inner groove 27 of the lens shape (FIG. 7).

Through coordinate transformation and interpolation processing, a table T2 based on the geometrical center point M can be obtained from a measurement table T1 based on the rotation center o1.

In this case, the distance 11 (inner diameter) from the geometric center point M to the lens inner groove 27 is P, and the angle between the inner diameter P and the horizontal axis is φ.

(3) Calculation of optical centering point 02 (Fig. 8).

Next, input the pupil distance, PD or 1/2 of it, pupil diameter PD/2, and a predetermined [PA] from the operation switch 31.
Determine optical centering point 02. Here, the C1 optical centering point 02 is the intersection of the line of sight and the lens, and is determined by the wearer of the glasses and the wearing conditions, and the optical center of the lens is set at this position. The computing device 30 is
As shown in FIG. 8, the distance P from the midline 1c of the frame
A point 02 that is D/2 away and above a distance PA from the horizontal line LX passing through the geometrical center point M is defined as this optical centering point 02.

(4) Calculation of the inner diameter Q from the optical centering point 02 to the lens inner groove 27 (FIG. 9).

By the same coordinate transformation as in item (2), a table T3 based on the optical centering point 02 is formed from a table T2 based on the geometrical center point M.

In this case, the distance X (inner diameter) from the optical centering point 02 to the lens inner groove 27 is defined as Q, and the angle between the inner diameter Q and the horizontal axis is defined as ψ.

(5) Lens processing bias Δ addition (Figure 10).

The above bias Δ (generally 0.4B
degree), add Δ to the inner diameter Q of table T3,
A table T4 shown in FIG. 10 is formed.

(6) Calculation of the bevel value (see Figure 2 (b)).

When inputting the bevel degree n and the beveling dimension α from the operation switch 31, the calculation unit H30 calculates ε=Qxn XK+α
=εO+a−<3> where ε: bevel value: proportional constant ε0: bevel value when beveling size α-〇, the bevel value ε is determined by the formula. This bevel value ε corresponds to the amount of axial movement of the lens 5 during bevel processing, and the pulse motor 23 is controlled by this bevel value ε.

Returning to FIG. 4 again, 32 determines the ball I! based on the above calculation result and the rotation angle Lθ of the lens 5 (which is supplied from the rotary encoder 14). ! ! Ivs25 movement mechanism 1
This is a control device that controls 6.24. To explain further, the control device 32 controls the value ψi of the table T4 supplied from the arithmetic device 30 during the roughening process.
and Qi+Δ(i-1,2...360), and the rotation angle Lθ of the lens 5 supplied from the rotary encoder 14.
The pulse motor 19 of the moving vJ mechanism 16 is controlled so that the distance between the axis of the chuck shaft 6 and the peripheral edge of the lens 5 becomes Qi+Δ when the rotation angle Lθ is ψi.

On the other hand, when bevelling, the rotation angle of the lens 5 is θ
The bevel value ε corresponding to is taken, and the pulse motor 23 of the moving mechanism 24 is controlled thereby to shift the lens 5 in the axial direction. Note that the calculation of the bevel value ε is performed using the value ψi corresponding to the rotation angle Lθ.
, θ1 are extracted from the table T3 and are obtained by applying equation (3) thereto, and this calculation is performed by the calculation VA unit 30 as described above.

Note that 33 in FIG. 4 is a display device that digitally displays various numerical values.

Next, the operation of the above embodiment will be explained. This embodiment has three operating modes: a stone type measurement mode, a lens roughening mode, and a beveling mode, which will be explained in order below.

(1) Stone type measurement mode.

In order to measure the inner diameter of mold 1 using the frame inner diameter measuring device 26, first visually align the point that is considered to be the geometrical center point M of mold 1 with the rotation center 01 of the contactor 28, and then move the frame to the measuring device 26. Attach and fix.

Next, when a start switch (not shown) is pressed down, the contact 28 starts rotating, the measuring signal shown in FIG. 5 is output, and the inner diameter R corresponding to the rotation angle θ of the contact 28 is The measurements are sequentially recorded in the measurement table T1 in 30.

(2) Lens phase accommodation mode.

When performing rough layering of the lens, first move the chuck operating shaft 7.
is operated to sandwich the lens 5 between the chuck shaft 6 and the chuck operating shaft 7. In such a case, in the conventional device, the geometrical center point M was aligned with the axis of the check shaft 6, but in this embodiment, the optical centering point 02, that is, the center point of the lens is made to coincide with the axis of the chuck shaft 6. Therefore, the lens 5 can be held easily and reliably.

Next, the pulse motor 23 of the mobile device #124 is controlled so that the apex of the lens 5 comes to a predetermined initial position. As a result, the lens 5 is placed directly above the grindstone 8 for rough grinding.
will be located. Note that the detection of the above initial position is as follows:
This can be done using a limit switch or the like.

Now, when the initial position setting of the lens 5 is completed, a start switch (not shown) is pressed down. As a result, the motor 13 of the rotation mechanism 11 starts rotating, and the chuck shaft 6 and lens 5 slowly rotate.

Then, the head 3 descends and the lens 5 comes into contact with the grindstone 8 rotating at high speed, and rough grinding is performed. In this case, the rotation angle Lθ of the lens 5 is sequentially detected by the rotary encoder 14, and the diameter Qi+Δ corresponding to the rotation angle ψi equal to the rotation angle Lθ is projected from the table T4, and the moving mechanism 1
6 pulse motors 19 are controlled. As a result, the processing position of the head 3 is regulated, and the lens 5 is moved into the lens-shaped inner groove 27.
It is roughly pooled to match.

(3-day addition mode.

This mode includes free reshaping and forced reshaping. Free bevelling (free grinding) is performed by setting the moving mechanism 24 in a free state, that is, in a state in which the support shaft 21 can freely move in the direction of the arrow YYh in FIG. The processing is performed in this embodiment in the same manner as in the conventional method.

On the other hand, in forced bevelling (forced curve grinding), machining is performed based on the beveling degree n and the beveling dimension α (see FIG. 2(b)) inputted from the operation switch 31. The forced beveling process will be explained below.

First, similarly to the above item (2), the lens 5 to be beveled (generally a lens that has been roughly polished) is set between the chuck shaft 6 and the chuck operating shaft 7. Further, the bevel degree n and the beveling dimension α are inputted from the operation switch 31. In addition, when the bevel is unnecessary, α=0
And you don't need to enter it.

Next, the pulse motor 23 of the moving mechanism 24 is controlled to set the initial position so that the apex of the lens 5 is directly above the beveling grindstone 8a.

After the lens 5 is set at the predetermined initial position in this way, when the start switch is pressed, the motor 13 of the rotation mechanism 11 starts rotating, the chuck shaft 6 and the lens 5 rotate together, and the lens 5 rotates. The angle Lθ is sequentially detected by the rotary encoder 14. When this rotation angle Lθ is supplied to the arithmetic unit 30 via the control device 32, the arithmetic unit 30 searches the table T3, reads out an angle φi that is equal to the rotation angle θ, and a corresponding diameter Qi, Using this diameter Qi, the moving mechanism 16 is controlled in the same way as in item (2) above so that the lens 5 is always in contact with the grindstone 8a. In other words, the transfer mechanism 16 performs the same function as the template 9 in the conventional device.

In parallel with the above control, the bevel value ε is calculated using equation (3), and the pulse motor of the moving mechanism 24 is controlled via the control device 32 so that the apex of the lens 5 is at a position shifted by ε from the initial position. 23.

In this way, the desired beveling process is performed while the lens 5 is simultaneously moved in the radial and axial directions.

In the above embodiment, the movable IM 416° 24 was configured mainly using the pulse motors 19 and 23, but feedback control may be performed using a servo mechanism instead of the pulse motor.

〔"Effect of the invention〕

As explained above, in the present invention, the beveling of a lens can be performed fully automatically and with great precision, so that there is an advantage that beveling does not require a high degree of skill.

Further, when setting the lens on the ball Ill, the optical centering point (center point) of the lens is made the center of processing, so the lens can be set easily and reliably.

[Brief explanation of drawings]

Fig. 1 is a front view showing the configuration of the main parts of a ball-sliding machine according to an embodiment of the present invention, Fig. 2 <a> is a plan view thereof, and Fig. 2(b)
is a diagram for explaining the bevel value ε, and Figure 3 is for the ball 1 mentioned above.
4 is a block diagram showing the electrical configuration of the above embodiment, FIG. 5 is a conceptual diagram showing the measurement output of the frame inner diameter measuring device, and FIG. 6 is a diagram showing the measurement output of the frame inner diameter measuring device. A conceptual diagram showing the calculation method, Fig. 7 is a diagram showing the relationship between the rotation angle φ and the inner diameter P when centered on the geometric center point M, and Fig. 8 shows how to find the optical centering point 02. 9 is a diagram showing the relationship between the rotation angle Φ and the inner diameter Q when the optical centering point 02 is the center, FIG. 10 is a diagram for explaining the machining bias Δ, and FIGS. FIG. 13 is a side view, a front view, and a plan view showing the configuration of a conventional ball-sliding machine. 5... Lens, 16... Movement #jJ mechanism (first moving means), 24... Movement mechanism (second
means of transportation), 25... Tamazuri machine, 26...
...Frame inner diameter measuring device (measuring means), 27...
...Ground inner groove, 28...Contact, 30...
...Arithmetic means, 31...Operation switch, 32
...Control means, 02...Optical centering point, PD...Pupillary distance, Q...When centering on the optical centering point Inner diameter, R...Measurement inner diameter, ε...Bevel value, Δ...Lens processing bias. Fig. 5 Fig. 6 (Rcos θJmin + ncosb)mox Fig. 7 Fig. 8 Fig. 7 Rem and middle rice Fig. 9 Fig. 1O Fig. 12

Claims (1)

[Claims] (a) Tracing the inner groove of the lens shape of the frame with a contact,
The distance between the center of rotation of this contact and the inner groove of the lens shape is the first
(b) measuring means for outputting the inner diameter of the lens along with the rotation angle of the contact; After determining the centering point and calculating the distance from this optical centering point to the inner groove of the lens shape as the second inner diameter, calculate the bevel value based on the second inner diameter and the input from the operation switch. (c) a bevel machine having a first moving means for moving the lens in the radial direction and a second moving means for moving the lens in the axial direction; (d) the bevel numerical value; An automatic eyeglass swivel device comprising: control means for drive-controlling the first and second moving means based on the above, and applying a beveling process to the lens.