JPH0647664A - Whetstone dressing device and dressing member used therefor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a dressing member and a lens grinding device that facilitate dressing work. [Structure] A holding unit 202 is provided on a dressing disc 201. Then, the holding portion 202 is held by the lens holding means of the lens grinding device. In this state, dressing can be performed by performing the same operation as lens grinding. [Effect] The dressing work is easy and the splashed water does not splash on the worker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dressing device for a grindstone used for processing an edge portion of a spectacle lens and a dressing member used for the dressing device.

[0002]

2. Description of the Related Art A disk-shaped (or cylindrical) diamond grindstone is usually used for a lens grinding machine used for processing a lens or the like.

The diamond grindstone has a diamond layer formed by sintering metal powder, which is usually called "bond", and fine diamond abrasive grains on the outer periphery thereof.

Since the diamond abrasive grains are normally projected on the surface of the diamond layer at the beginning of use of the grindstone, the sharpness is good.

However, if it is used for a long period of time, the sharpness becomes poor due to the diamond abrasive grains falling off, abrasion, or clogging. In such a case, to adjust the surface of the diamond layer to restore the protruding state of the diamond abrasive grains to the normal state,
In order to eliminate the clogging, a process called dressing is performed.

The dressing treatment is performed by using a grindstone called "dressing stick" made of materials such as C (carbon borundum), GC (green carborundum) and WA (white alundum). This is to sharpen the diamond layer of the grindstone of the lens grinding machine.

[0007]

In an actual dressing operation, a rod-shaped dressing stick is manually pressed against a rotating diamond grindstone to grind while sprinkling water.

Therefore, the particles and water of the ground dressing are scattered, and the hands and clothes of the operator are soiled. Further, since the grinding is performed by pressing the dressing stick by hand, the degree of sharpness recovery varies depending on the operator. Also, the workability was poor.

It is an object of the present invention to provide a dressing device which has good workability and can perform dressing work without causing stains on clothes and a dressing member used therefor.

Another object of the present invention is to provide a lens grinding device having a dressing function.

[0011]

The present invention has been made in order to achieve the above object, and in one aspect thereof, a workpiece holding means capable of holding a workpiece at a desired position and angle, In a dressing member used for dressing the grindstone of a grinding device having a grindstone configured to grind the grindstone held by the grindstone held by the grindstone holding means, the workpiece holding There is provided a dressing member comprising: a held portion held by the means; and a dressing portion that abuts the grindstone and dresses the grindstone.

The dressing portion may have a circumferential surface centered on an axis passing through the held portion.

It is preferable to have a scale provided on the dressing portion.

As another aspect of the present invention, in a dressing device for dressing a grindstone using a dressing member, a grindstone holding means for holding the grindstone and a rotating means for rotating the grindstone held by the grindstone holding means. And a change for changing the relative positional relationship between the dressing member holding means for holding the dressing member, the dressing member held by the dressing member holding means, and the grindstone held by the grindstone holding means. Means and
Positioning means for detecting the relative positional relationship between the held dressing member and the held grindstone,
In a state where the whetstone and the dressing member are brought into contact with each other by the changing means, a control means that performs the dressing process by rotating the whetstone by the rotating means, and a detection result of the position detecting means during the dressing process. Based on the above, the dressing monitoring means for monitoring a change in the relative positional relationship between the dressing member and the grindstone, and stopping the dressing process when the change reaches a preset amount. A dressing device is provided.

In this case, it is preferable that the monitoring means has an informing means, and the monitoring means activates the informing means when the change in the relative positional relationship reaches the preset amount.

The control means has a remaining amount confirmation means for confirming the remaining amount of the dressing member based on the detection result of the position detection means in the state where the dressing member and the grindstone are in contact with each other. , Comparing the remaining amount confirmed by the remaining amount confirmation means with the preset amount,
When the remaining amount is smaller than the preset amount, it is preferable to notify the worker using the notifying means.

The control means preferably confirms the remaining amount before starting the dressing process.

The dressing member holding means may be configured to hold a lens.

According to another aspect of the present invention, in a lens grinding apparatus for processing a lens into a desired shape by using a grindstone, a grinding means for holding and rotating the grindstone and a lens or a dressing member for rotating. Holding means, a lens or dressing member held by the holding means, changing means for changing the relative positional relationship between the grinding means, the lens or dressing member held by the holding means, and Position detecting means for detecting a relative positional relationship with the grindstone, and a control means having at least two operation modes of a lens grinding mode and a dressing mode, the control means comprising: In the dressing mode, while the grindstone and the dressing member are in contact with each other by the changing means, the grindstone is rotated to dress the dressing. While performing the process, during the dressing process, based on the detection result of the position detecting means, the change in the relative positional relationship between the dressing member and the grindstone is monitored, and when the change reaches a preset amount. Performing a process of stopping the dressing process,
A lens grinding apparatus is provided.

The control means, in the dressing mode, performs the dressing based on the detection result of the position detecting means when the dressing member held by the holding means and the grindstone are in contact with each other. It is preferable to execute a process of determining the remaining amount of the working member.

[0021]

The holding means holds the holding portion of the dressing member.

In the dressing mode, the control means first causes the dressing member to contact the grindstone by the changing means. At this time, the remaining amount of the dressing member is confirmed based on the detection result of the position detecting means.

After that, the control means performs the dressing process by rotating the grindstone. During the dressing process, the control means monitors, based on the detection result of the position detection means, whether the dressed amount has reached a preset amount. When it reaches, the dressing process is stopped.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dressing disk according to an embodiment of the present invention will be described with reference to the drawings.

The present embodiment is characterized in that the dressing work is facilitated without changing the lens grinding device itself. Before describing the dressing disc, the configuration of a lens grinding apparatus, which is a prerequisite for its use, will be described with reference to FIGS. 1 and 2.

The lens grinding device comprises a holding mechanism for holding a lens to be processed at a desired position and angle, and a grinding section for cutting the lens.

The grinding section comprises a grindstone rotating motor 118 arranged on the main body frame 101 and a grindstone 116 rotated by the motor. In addition, normally, the grindstone 116 is
A rough whetstone 116a for rough cutting and a finish whetstone 116b for finish cutting are laminated and integrated. This is for performing the grinding work without replacing the grindstone.
The position of the grinding unit of this embodiment does not move as a whole, and during processing, desired processing is performed by changing the position and angle on the lens side by the holding mechanism described above.

The holding mechanism is capable of performing three types of movements on the lens in order to allow desired processing. The first movement is a rotational movement of the lens itself for changing the contact position of the lens itself, that is, the position to be processed. In the figure, the rotational movement is indicated by arrow A. The second movement is a movement for contacting and separating the lens and the grindstone 116. The movement is indicated by arrow B in FIG.
Indicated. The third movement is a lateral movement on the grindstone 116 for changing the position where the lens abuts. The movement is indicated by arrow C in the figure.

A specific configuration will be described.

Most of the holding mechanism is a head frame 1 which is swingable above the main body frame 101.
It is located in and around 03.

The head frame 103 has a "concave" shape. Then, from the facing wall surfaces forming the concave portion, the lens rotation shafts 106 arranged in the same straight line are formed.
a and 106b are projected.

The lens rotation shaft 106b has a structure in which the position in the left-right direction is changed by a lens clamp handle 119 arranged on the right side thereof. By operating the lens clamp handle 1119, the lens rotation shaft 1
By changing the position of 06b, the lens rotation axis 10
The lens is sandwiched between 6a and the lens rotation shaft 106b. In FIG. 8, not the lens but the dressing disc 2 of this embodiment described later.
01 is held.

The lens rotation shafts 106a and 106b are constructed so as to be rotated at a constant speed under the force of the lens rotation motor 110 arranged in the head frame 103. By the rotation of the lens rotation shafts 106a and 106b,
The above-mentioned first movement, that is, the processing position of the lens is changed. The lens rotation motor 11
The rotational force of 0 is transmitted by the rotational force transmission mechanism including the gear 111, the gear 109, the lens rotation auxiliary shaft 107, and the belts 108a and 108b. However, the rotational force transmission mechanism itself has no special feature. Since it is not present, detailed description is omitted.

A template 104 is mounted coaxially with the lens rotation shaft 106 at the left end of the lens rotation shaft 106a. The template 104 shows a target shape for lens processing, that is, a frame shape.
Along with 06, the template 104 also rotates. A mold receiver 117 is arranged below the mold plate 104. The position of the die receiver 117 is the same height position and front-back direction position as the position where the grindstone 116 contacts the lens. Note that these roles will also be described later in the description of the swing motion of the head frame 103.

A support shaft 102 is arranged in the left-right direction on the upper rear side of the main body frame 101. Head frame
The frame 103 is connected to the main body frame 10 via the support shaft 102.
1 is rotatably attached. Then, the second movement described above is realized by rotating the support shaft 102 as an axis. That is, the head frame 103
By rotating and lifting upward, the held lens and the grindstone 116 are separated from each other. On the contrary, by rotating the head frame 103 to lower it, the lens is moved to the grindstone 1.
16 can be brought into contact with and ground. In addition,
In this case, the load required for cutting is the head frame 103.
It is adjusted so that it can be obtained by its own weight. The template 104 plays a role of controlling the amount of cutting work performed in this way. That is, as the cutting progresses, the mold plate 104 comes into contact with the mold receiver 117 and prevents the head frame 103 from further lowering. Therefore, the template 10
There is no accidental overcutting of the lens beyond the shape defined by 4.

Further, the head frame 103 is not fixed in the axial direction of the support shaft 102, and the position in the axial direction can be arbitrarily changed. Thereby, the above-mentioned third movement is realized, and the coarse whetstone 116a and the finishing whetstone 116b can be freely used properly. However, since it is inconvenient if the third movement is performed during lens processing, a stopper mechanism is provided to regulate this. The stopper mechanism includes a stopper plate 115 provided on the main body frame 101.
And the guide pin 14 provided on the head frame 103.
Consists of. The stopper plate 115 has a concave portion on the upper portion thereof, which can be fitted with the guide pin 14. The stopper plate 1
Reference numeral 15 is configured to move together with the head frame 103 in the direction of arrow C. Further, when the head frame 103 is lowered, its position is fixed.

The guide pin 14 is the head frame 103.
When it is lowered, it fits into the recess of the stopper plate 115 and regulates the lateral movement of the head frame.

Although not shown in this figure, the lens grinding device has a pump, a nozzle, etc. for supplying water for processing to the outer peripheral surface of the grindstone 116.

The control configuration of the lens grinding device will be described with reference to FIG.

The lens grinding apparatus includes a CPU 181, a memory 182, an interface 185, a control circuit 187,
The operation is controlled by the control unit 180 including the operation key-184.

A predetermined operation command is input from the operation key-184. Then, the CPU 181 analyzes the input according to the software built in the memory 182, and outputs a predetermined control command to the control circuit 187 via the interface 185. The control circuit 187 controls the lens rotation motor 110 and the like in accordance with the control instruction to cause a predetermined operation.

A dressing disk of this embodiment that can be used in the lens grinding apparatus described above will be described with reference to FIG.

The dressing disc 201 is disk-shaped, and a counterbore portion 202 for attaching to a lens grinding machine is provided at the center thereof. When dressing is performed, the lens rotation shaft 16 described above can be inserted into the countersunk portion 202 to hold it in the same manner as a lens (see FIG. 4).

Further, the dressing disc 201 is provided on its side surface with a scale 204 as a guide for dressing. Therefore, the dressing amount can be easily and accurately determined according to the state of the whetstone 116 to be dressed. Moreover, the progress of the work can be easily confirmed even during the work.
In the present embodiment, normally, the lessing is performed by two scales. In addition, the scale is provided so that dressing may be performed for 3 scales if the grindstone is severely clogged, and for 1 scale if the grindstone is less clogged. The interval between the scales 204 becomes wider toward the center side. This is to compensate for the smaller radius on the center side.

The width d1 is smaller than the width of the grindstone 116. However, if this width d1 is made equal to the width of the grindstone 116, the head frame 103 can be used during dressing work.
Since there is no need to move the sideways, the work efficiency is increased. In addition, the entire surface of the grindstone 116 can be dressed uniformly. However, head frame 1
If the width d1 is increased while the force of pushing 03 downward is kept constant, the dressing disk 201 is moved to the grindstone 11
There is a possibility that the pressure to be applied to 6 becomes small and sufficient dressing cannot be performed. Therefore, in order to adopt such a configuration, it is premised that the pressing pressure is sufficiently obtained.

Since the material and hardness of the dressing disc 01 are different depending on the type of the grindstone 116 (for example, the rough whetstone 116b and the finishing whetstone 116a), the optimum dressing disc 201 should be selected and used. Needless to say.

Another example of the dressing disc is shown in FIG.

As described above, in many cases, the grindstones 116 are usually integrated with each other. Therefore,
In this example, the dressing disc 20 correspondingly corresponds to this.
The feature is that 1'is integrated with those corresponding to the respective grindstones 116a and 116b. In this case, each width d2
Naturally, d3 should be the same as the width of the grindstone corresponding to this.

Needless to say, when selecting the respective materials, it is preferable to select and combine the materials having the same shaving amount in one dressing.

The dressing operation will be described with reference to FIG.

First, with the head frame 103 raised, the lens handle clamp 119 is operated to hold the dressing disc 201 between the lens rotation shaft 106a and the lens rotation shaft 106b (step 61).
0).

The operator operates the start key in the operation keys 184 (step 620). Then, the control unit 18
0 is the lens rotation motor 110 and the grindstone rotation motor 1
18 is started, dressing disk 201, grindstone 11
6 rotation starts. Further, in parallel with this, supply of processing water to the grindstone is started (step 630).

In this state, the operator operates the head frame 1
03 is manually rotated to bring it down (step 64, see FIG. 1). Then dressing disc 2
01 and the grindstone 116 are in contact with each other while rotating.
As a result, the dressing 201 is scraped off by the grindstone 116. In other words, the dressing of the grindstone 116 is performed. It should be noted that the third movement of the head frame 103, that is, the movement in the left-right direction, is caused by the guide pin 111.
Since it is regulated by 4 or the like, the position will not be carelessly displaced during the dressing.

While performing the dressing, the operator can surely grasp the progress of the dressing by monitoring whether or not the predetermined scale 204 has been scraped off. In this case, if the template 104 corresponding to the scale 204 at the desired position is used, it is possible to prevent unnecessary dressing and improve workability.

After dressing by the desired amount, the head frame 103 is raised (step 66).
0), the dressing work is completed.

In this embodiment, the work end time is determined based on the amount of the dressing disc scraped, but the present invention is not limited to this. For example, it may be determined based on the working time. In this case, workability is improved by providing a timer, a buzzer, etc. to inform the operator that a predetermined time has passed and automatically stopping the movement of the lens rotation motor and the like.

The dressing members shown in this embodiment (dressing disks 201, 201 ', FIGS. 3 and 5)
In order to use the whole uniformly and without waste, all of them were disc-shaped or column-shaped. But,
The invention is not limited to this, but the lens rotation shaft 106a,
The shape and size thereof are not limited as long as they can be held by 106b. However, for example,
Bar-shaped dressing member (Dressing Stick 20
When 9) is used, it is necessary to set the mounting angle in the direction shown in FIG. 7 and stop the rotation of the lens rotation shaft 106. In the case of the dressing stick 209 which is used by being fixed in this way,
Unlike the case where the scales are turned, there is no problem even if the scales 204 are provided at equal intervals at all positions.

According to this embodiment, the operator does not need to hold the dressing disc or the like by hand during the operation, and thus the operation is easy. In addition, the working environment is improved because the worker is not splashed with water or the like accompanying the dressing work. Further, in order to obtain such an effect, the lens grinding apparatus itself does not need to be improved, so that the burden in terms of cost hardly increases and the actual application is easy.

Another embodiment will be described.

The above-described embodiment is advantageous in terms of cost because it does not change the lens grinding device that has been conventionally used, but its workability is limited to be improved. Therefore, in this embodiment, the lens grinding device itself is provided with a function for dressing to further improve workability and the like. That is, the lens grinding apparatus of the present embodiment is intended to automate the above-mentioned first movement, second movement, third movement, pressing of the dressing disc, control of the dressing amount, and the like during dressing work. It has a feature in the point.

The structure will be described below with reference to FIG.

Support bearing 6 fixed to the body frame 1
A support shaft 7 is fixedly mounted on a and 6b. The base end of the head frame 2 that supports the lens LE is swingably fitted to the support shaft 7 while being restricted in the thrust direction, and the lateral movement member 8 of the head frame 2 is fitted to the support shaft 7. ing.

The lateral movement member 8 is slidably supported by the shaft 11 in the axial direction of the support shaft 7, and the rack 12 is fixed thereto. One end of the shaft 11 is fitted in parallel with the support shaft 7 by a support member 10 fixed to the body frame 1. Further, the rack 12 fixed to the side surface of the lateral movement member 8 is fitted with a pinion 13a fitted to the rotation shaft of a head frame lateral movement motor 13 which is a pulse motor. With this configuration, when the lateral movement motor 13 rotates, the lateral movement member 8 moves in the axial direction of the shaft 11, and the head frame 2 whose end surface is aligned with the lateral movement member 8 also moves. Therefore,
The head frame 2 moves in the axial direction of the support shaft 7 in accordance with the rotation direction of the lateral movement motor 13.

On the side surface of the head frame 2 on the base end side, a sector gear 61 centered on the support shaft 7 is fixed.
The sector gear 61 has a pinion 62 mounted on a grinding load adjusting motor 62 installed on the member 8 for lateral movement.
a and a position detector 70 also installed on the lateral movement member 8
Is engaged with the pinion 70a attached to the.

The position detector 70 is for confirming the position of the lens LE or the dressing disc by detecting the position of the head frame 2.
In this embodiment, an encoder is used as the position detector 70 to detect the angular position about the support shaft 7 of the head frame 2.

The cylinder 23 fixed to the body frame 1 includes
The vertical shaft 20 is fitted so as to be slidable upward. A roller 21 is rotatably attached to the upper end of the up-and-down moving shaft 20, and is in contact with an abutting stop member 24 fixed to the lower end of the head frame 2 on the tip side. A rack 20a is formed on the vertical movement shaft 20 and meshes with a pinion 22a fitted to a rotary shaft of a vertical movement motor 22 for vertically moving a head frame which is a pulse motor. With this configuration, when the vertical movement motor 22 rotates, the vertical movement shaft 20
Moves in the vertical direction, and the roller 21 and the stopper member 2
The head frame 2 swings around the support shaft 7 via the shaft 4.

The head frame 2 is formed with a recess for arranging a member for holding the lens LE to be processed.
A lens rotation shaft 30a and a lens receiving shaft 30b are coaxially and rotatably supported inside the recess.
The lens rotation shaft 30a has a known holding mechanism (not shown), and holds the lens LE between the shafts 30a and 30b. A pulley 31b is attached to the lens receiving shaft 30b. In the head frame 2, pulleys 33a,
A rotary shaft 36 having 33b at both ends is provided. A gear 34 is attached to one end of the rotary shaft 36, and meshes with a pinion 35a attached to the rotary shaft of a lens rotary motor 35 which is a pulse motor. Pulley 31
Belts 32a and 32b are stretched between a and 31b and pulleys 33a and 33b, respectively. When the lens rotation motor 35 is rotated by these configurations, the lens L
E rotates. Although the state in which the lens LE is held is shown in this figure, the dressing disk is held in the same manner during dressing.

As shown in FIG. 10, a rack 30c is formed on the end surface of the lens rotation shaft 30a opposite to the lens LE, and the motor shaft of the chucking motor 37 fixedly mounted on the end surface of the head frame 2. Attached to the pinion 3
It meshes with 7a. The lens rotation shaft 30a and the rack 30c are connected to the pulley 31a by a connecting member 30d. The rack 30c is connected to the pulley 31a by a connecting member 30d so as to be slidable in the axial direction of the lens rotation shaft 30a by driving the chucking motor 37 and not rotated by the rotation of the pulley 31a.

On the other hand, the lens rotation shaft 30a is connected to the rack 30.
It is connected to the pulley 31a by a connecting member 30d so as to slide in the axial direction of itself along with the sliding of c and rotate along with the rotation of the pulley 31a.

Further, originally, the frame 1 is provided with the grindstone 3 and the grindstone rotation motor 5, both of which are provided with pulleys 51 and 52, respectively, and a belt 53.
Are linked by.

The control configuration of the lens grinding device will be described.

The control section 80 is arranged on the front side of the apparatus as shown in FIG. The control unit 80 has operation keys 84.
And a program memory 82 in which various programs are stored, and a data memory 83 in which various data are stored.
And a CPU 81. Further, it is configured to have a control circuit 87 that directly controls various motors, a buzzer 86 that notifies the end of grinding, and an interface circuit 85 that connects these to the CPU 81.

The operation key 84 is for inputting various data and instructions for starting operation, and is provided with a start key and a stop key. Further, in this embodiment, a mode selection key is provided to select either a grinding mode or a dressing mode described later.

The CPU 81 controls the entire apparatus by calculating and outputting various control data using various programs and information stored in the program memory 82 and the data memory 83.

In the control circuit 87, drive circuits for the above-mentioned various motors are provided. For example, as a drive circuit for the grinding load adjusting motor 62, as shown in FIG. 10, there are a drive circuit 87a for grinding and a drive circuit 87b for start / end of grinding. Then, these drive circuits 87
One of the outputs from a and 87b is selected by the changeover switch 88 and output to the grinding load adjusting motor 62. In addition to the instruction from the CPU 81, the drive circuit 87b for starting and ending the grinding is
It operates based on the signal from the position detector 70.

The control unit 80 realized by the above-mentioned structure has two modes which are realized by software in the control. One is a dressing mode which is a feature of this embodiment. In the dressing mode, the control unit 80 is configured to control each unit and automatically execute / end the dressing. The details of the control in the dressing mode will be described later in the description of the operation. Another mode is the grinding mode, which is the mode selected when grinding the lens.
The grinding mode has no characteristic and will not be described in particular.

The dressing member used in this embodiment may be the dressing disc 201 described as the first embodiment. However, in this embodiment, since the dressing amount can be automatically controlled, the scale 204 may be omitted.

The dressing operation will be described.

Before the work, the head frame 2 is at the initial position set above.

In this state, the operator operates the chucking motor 37 to move the dressing disc 201.
Is held by the lens rotation shaft 30 (step 710, see FIG. 12). Further, the mode selection key is operated to select the dressing mode (step 715). Note that either step 710 or step 715 may be performed first.

After the above preparations are completed, when the operator turns on the start button (step 720), the controller 80
Performs mode determination processing (step 725). If the result is grinding mode, step 730
Proceed to and perform the grinding process. Since the grinding process is not directly related to the present invention, no particular description will be given. on the other hand,
If it is the dressing mode, step 735.
~ Perform the dressing operation described in step 780.

First, the head frame 2 is moved by the lateral movement motor 13 to position the dressing disk 201 above the grindstone 3 (step 735). continue,
The vertical movement motor 22 is operated to lower the head frame 2 (step 740), and the head frame 2 is stopped when it abuts the grindstone 3 (step 745). The contact between the dressing disc 201 and the grindstone 3 is performed by monitoring the output of the position detector 70. That is, despite the vertical movement motor 22 being in operation, the position detector 7
When the output from 0 stops changing, it is determined that the contact is made. The angular position of the head frame 2 in this state (hereinafter, the angle in this state is referred to as "angular position θ1").
Is detected by the position detector 70 and stored in the data memory 83 as a dressing start position. In addition, the dressing disc 2 is based on the angular position θ1.
Check the remaining amount of 01. That is, the grindstone 3 may be clogged during long-term use, but is not significantly scraped by itself. That is, the diameter of the grindstone 3 does not change significantly. On the other hand, the dressing disc 201 is dressed by being scraped off by the grindstone 3 as described in the above embodiment. Therefore, by confirming the angular position θ1 having a value corresponding to the diameter of the dressing disc 201,
The remaining amount of the dressing disc 201 can be confirmed. In this case, when the remaining amount is less than one dressing, the buzzer 86 is operated to notify the operator of the fact (step 750).

After the confirmation of the remaining amount of the dressing disc 201 is completed, the controller 80 once raises the head frame 2 and returns it to the initial position (step 755). Then, at the initial position, the grindstone rotating motor 5 and the lens rotating motor 35 are operated to rotate the grindstone 3 and the dressing disc 201. At the same time, the supply of water to the grindstone 3 is started (step 760). After this, the head frame 2 is lowered again (step 76).
5) Then, the dressing process is started from the angular position θ1 (step 770). While performing the dressing process, the control unit 80 operates the grinding load adjusting motor 62 to continue to apply a predetermined pressure, that is, the grinding load, between the dressing disc 201 and the grindstone 3. The control method of the grinding load adjusting motor 62 for applying the predetermined pressure will be described later in detail with reference to FIGS. 13 and 14.

During the dressing process, the controller 80 monitors the change in the angular position of the head frame 2 by the position detector 70 (step 77).
5). When the amount of change reaches a preset value, the end buzzer 86 is sounded and the head frame 2 is raised and returned to the initial position (step 785).
Then, the rotation of the dressing disc 201 is stopped (step 785).

After this, the operator removes the dressing disc 201, and the dressing work ends.

A method of controlling the grinding load adjusting motor 62 will be described.

In order to apply the predetermined grinding load, first, the torque T _j that the grinding load adjusting motor 62 must apply to the head frame 2 must be determined.

As shown in FIGS. 13 and 14, the center of the support shaft 7 is O, and the center of the lens rotation shaft 30a is O ', O.
The length between O'is L, the center of gravity of the head frame 2 is O,
The weight is G ₀ , the length of OG is 1, the vertical load at the center O ′ is W, and the reaction force is W ′ (W = W ′), O,
The angle formed by the line connecting O'with the horizontal is α.

The moment about the center O is

[0090]

## EQU1 ## LW'cosα = 1G ₀ cosα.

Here, W'cosα = Wcosα, and Wcosα is the load F ₁ received by the dressing disk 201 from the grindstone 3 due to the own weight of the head frame 2.
Is represented.

[0092]

## EQU2 ## F ₁ = W cos α = 1 / LG ₀ cos α Further, the load F ₂ received by the dressing disk 201 from the grindstone 3 by driving the grinding load adjusting motor 62 is the torque of the grinding load adjusting motor 62. T _j , sector gear 61
Is R, and the radius of the pinion 62a is r _j ,

[0093]

It can be expressed as F ₂ = T / r × R / L.

Therefore, the grinding load J is

[0095]

## EQU4 ## It can be expressed as J = F ₁ ± F ₂ = 1 / LG ₀ cos α ± T _j / r ₀ × R / L. Therefore, by substituting the previously determined grinding load J into this Equation 4, The torque T _j of the grinding load adjusting motor 62 is determined.

The torque T calculated in this way
_j is output from the CPU 81 via the interface circuit 85 to the corresponding drive circuit 87a of the control circuit 87 (see FIG. 10). Then, the grinding load adjusting motor 62
Generate this torque T _j .

Although the grinding load is constant in this embodiment, it can be changed according to the clogging of the grindstone 3. For example, the grinding load J = 3 kg is usually set, and the grinding load J = 5 kg may be set only when the clogging is severe. Alternatively, the load may be changed according to the shape of the dressing member. For example, when the dressing member is disc-shaped as in this embodiment, J = 3k
g, and in the case of a rod shape, J = 5 kg.

As described above, in this embodiment,
The dressing can be automated and anyone can dress easily and reliably. In this embodiment, the lens grinding device is added with the function for dressing described above, but it goes without saying that a dressing device dedicated to dressing may be used.

In the present embodiment, since the position of the grindstone 3 is fixed, only the position of the head frame 2 is detected to confirm the remaining amount and the contact position, etc. 3 may be configured to change its position. In this case, the position detector 70 is configured to detect the position of the grindstone 3. Alternatively, both may move together. In this case, it is necessary to detect the positions of both.

[0100]

By using the dressing member or the lens grinding device of the present invention, dressing can be performed without soiling hands or clothes. In addition, anyone can easily and accurately perform dressing. Further, it is effective in terms of workability and cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lens grinding device to which a first embodiment of the present invention is applied.

FIG. 2 is a block diagram showing an internal configuration of the lens grinding apparatus shown in FIG.

FIG. 3 is a perspective view showing a dressing disc 201 which is an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state in which a dressing disc 201 is held by a lens grinding device.

FIG. 5 is a perspective view showing a dressing disc 201 ′.

FIG. 6 is a flowchart showing a dressing work procedure.

FIG. 7 is an explanatory diagram showing a state when the dressing stick 209 is used.

FIG. 8 is a partially cutaway perspective view showing the overall configuration of the lens grinding apparatus of the present embodiment.

FIG. 9 is a block diagram showing an internal configuration of a lens grinding device.

FIG. 10 is an explanatory diagram showing a control circuit 87.

FIG. 11 is a flowchart showing a dressing operation.

FIG. 12 is an explanatory diagram showing a state in which the dressing disc 201 is held by the lens grinding device.

FIG. 13 is an explanatory diagram showing a method for determining a grinding load.

FIG. 14 is an explanatory diagram showing a method for determining a grinding load.

[Explanation of symbols]

1: body frame, 2: head frame 3: grindstone,
5: grindstone rotation motor, 6: support bearing, 7: support shaft, 8: lateral movement member, 10: support member, 11: shaft, 12: rack, 13: lateral movement motor 1
3a: Pinion, 20a: Rack, 21: Roller,
22: motor for vertical movement, 22a: pinion, 23:
Tube, 24: stopper member, 30a: lens rotation axis,
30b: lens receiving shaft, 30c: rack, 30
d: connecting member, 31a: pulley, 31b: pulley,
33: Pulley, 35: Lens Rotating Motor, 36: Rotating Shaft, 37: Chucking Motor, 37a: Pinion, 51: Pulley, 52: Pulley, 53: Belt, 61: Sector Gear, 62 : Grinding load adjustment mode
62a: pinion, 70: position detector, 70
a: pinion, 80: control unit, 81: CPU, 8
2: Program memory, 83: Data memory, 8
4: Operation key, 85: Interface circuit, 86:
Buzzer, 87: Control circuit 88: Changeover switch,
101: body frame, 102: support shaft, 10
3: head frame, 104: template, 106: lens rotation axis, 107: lens rotation auxiliary axis, 108: belt, 110: lens rotation motor, 114: guide pin, 115: stopper plate, 116: grindstone, 11
7: Mold receiver, 118: Grindstone rotating motor, 119: Lens clamp handle, 181: CPU, 182:
Memory, 184: Operation key, 185: Interface
187: Control circuit, 201: Dressing disk, 202: Counterbore, 204: Scale, 20
9: Dressing stick, LE: Lens

Claims (10)

[Claims] 1. A grinding means configured to include a processing object holding means capable of holding a processing object at a desired position and angle, and a grindstone for grinding the processing object held by the processing object holding means. In the dressing member used in the dressing of the grindstone of the grinding device having, a held portion held by the processing object holding means, a dressing portion that contacts the grindstone, and dresses the grindstone, A dressing member comprising: 2. The dressing member, wherein the dressing portion has a circumferential surface centered on an axis passing through the held portion. 3. The dressing member according to claim 2, further comprising a scale provided on the dressing portion. 4. A dressing device for dressing a grindstone using a dressing member, a grindstone holding means for holding the grindstone, a rotating means for rotating the grindstone held by the grindstone holding means, and a dressing member Dressing member holding means to do, a dressing member held by the dressing member holding means, and a grindstone held by the grindstone holding means,
Changing means for changing the relative positional relationship, the held dressing member, a position detecting means for detecting the relative positional relationship between the held grindstone, and the whetstone and the dressing by the changing means A member for contacting, a control means for rotating the grindstone by the rotating means to perform a dressing process, and the dressing member based on the detection result of the position detecting means during the dressing process. Dressing monitoring means for monitoring a change in the relative positional relationship with the grindstone, and stopping the dressing process when the change reaches a preset amount. 5. The notification means is provided, and the monitoring means actuates the notification means when the change in the relative positional relationship reaches the preset amount. Dressing equipment. 6. A residual quantity confirming means for confirming a residual quantity of the dressing member based on a detection result of the position detecting means in a state where the dressing member and the grindstone are in contact with each other, the control The means compares the remaining amount confirmed by the remaining amount confirmation means with the preset amount, and when the remaining amount is smaller than the preset amount, the means for informing is used. The dressing device according to claim 5, wherein the dressing device is notified to a person. 7. The dressing device according to claim 6, wherein the control means confirms the remaining amount before starting the dressing process. 8. The dressing device according to claim 4, wherein the dressing member holding means is configured to hold a lens. 9. A grinding means for holding and rotating the grinding stone, a holding means for holding and rotating the lens or the dressing member, and a holding means for holding the lens in a lens grinding apparatus for processing the lens into a desired shape by using the grinding stone. Changing means for changing the relative positional relationship between the held lens or dressing member and the grinding means, the relative positional relationship between the lens or dressing member held by the holding means, and the grindstone Position detection means for detecting the, and a control means having at least two operation modes of a lens grinding mode and a dressing mode, the control means, in the dressing mode,
While changing the whetstone and the dressing member in contact with each other by the changing means, the whetstone is rotated to perform the dressing process, and during the dressing process, based on the detection result of the position detecting means, the dressing is performed. A lens grinding apparatus, which monitors a change in a relative positional relationship between a working member and a grindstone, and executes a process of stopping the dressing process when the change reaches a preset amount. 10. The control means includes the dressing mode.
In the state, the processing for determining the remaining amount of the dressing member based on the detection result of the position detection means in the state where the dressing member held by the holding means and the grindstone are in contact with each other The lens grinding device according to claim 9, wherein