JP2957224B2 - Chamfering mechanism for ball mill - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball mill having a chamfer for use in chamfering a corner of a spectacle lens.

[Prior Art] Conventionally, a ball grinding machine that performs rough grinding with a flat grindstone and then performs beveling with a bevel grindstone is well known.

The spectacle lens subjected to the beveling process as described above has corner portions on both sides of the bevel portion. It is not only dangerous for a user to commercialize the product while leaving the corners as it is, but also has a problem that it may cause cracks and breakage.

Therefore, a method of chamfering the corner is employed. And this chamfering method is more V
A chamfering grindstone having a small groove angle was used, and the corners of the spectacle lens were pressed against this.

[Problems to be Solved by the Invention] However, when the above-described chamfering grindstone is used, there is a disadvantage that the angle of the chamfer is always constant, and it is not possible to cope with various shapes of the spectacle lens. Further, since the corners of the rear surface of the lens are extremely sharp, it is desirable to perform two chamfers. In this case, two V-grooves having different angles must be prepared and controlled so as to obtain the optimum cut amount. In addition, it is not only difficult to process, but also has a drawback that it cannot cope with various shapes of eyeglass lenses.

The present invention has been devised in view of the above-mentioned drawbacks, and can perform chamfering of corners corresponding to spectacle lenses of various shapes, and can easily perform two or more chamfers on one corner. It is an object of the present invention to provide a simple ball mill.

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized by having the following configuration.

(1) In a chamfering mechanism of a ball-slider, which obtains radial information or template information of a lens frame of an eyeglass frame and a peripheral shape of a lens to be processed, cuts a peripheral edge of the lens to be processed, and forms a frame.
An arm that supports the chamfering grindstone and is supported by the main body base, grinding wheel rotating means for rotating the chamfering grindstone via a power transmission mechanism in the arm, and an axis of the chamfering grindstone by rotating the arm Angle changing means for changing the angle of the lens to be processed independently of the ups and downs of the edge of the lens to be processed, and the angle to the chamfering grindstone based on the radial information or template information and the peripheral shape of the lens to be processed. It is characterized by comprising control means for controlling the position of the processing lens to control the amount of chamfering, and load reducing means for reducing the load when a load exceeding a predetermined amount occurs at the time of chamfering.

(2) In the chamfering mechanism of the ball mill according to (1), the change of the angle of the shaft by the angle changing means is performed around a predetermined point on the outer peripheral surface of the chamfering grindstone.

(3) The chamfering mechanism of the ball mill according to (1), further including a measuring unit for measuring a position of a corner of the lens to be processed after finishing.

(4) In a chamfering mechanism of a ball-slider, which obtains radial information or template information of a lens frame of a spectacle frame and a peripheral shape of a lens to be processed, cuts the periphery of the lens to be processed, and forms a frame.
An arm that supports the chamfering grindstone and is supported by the main body base, grinding wheel rotating means for rotating the chamfering grindstone via a power transmission mechanism in the arm, and an axis of the chamfering grindstone by rotating the arm Angle changing means for changing the angle of the edge of the lens to be processed independently of the undulation of the lens to be processed, and measuring the position of the corner of the lens to be processed, which is attached to the mounting shaft of the chamfering grindstone and finished. A measuring unit,
Control means for controlling the position of the lens to be machined with respect to the chamfering grindstone based on the position of the corner of the lens to be machined by the measuring unit to control the amount of chamfering.

(5) In a chamfering mechanism of a ball-sliding machine, which obtains radial information or template information of a lens frame of a spectacle frame and a peripheral shape of a lens to be processed, cuts the periphery of the lens to be processed, and forms a frame.
An arm that supports the chamfering grindstone and is supported by the main body base, grinding wheel rotating means for rotating the chamfering grindstone via a power transmission mechanism in the arm, and an axis of the chamfering grindstone by rotating the arm Angle changing means for changing the angle of the lens to be processed independently of the ups and downs of the edge of the lens to be processed; and It is characterized by comprising control means for controlling the amount of chamfering by controlling the position of the processing lens, and load maintaining means for maintaining the load generated during chamfering substantially constant.

[Embodiment] Before describing the chamfered portion of the ball mill according to the present embodiment, a carriage for holding and moving a lens will be briefly described with reference to FIG.

A carriage shaft 702 is rotatably supported on a shaft 701 fixed to the base 1, and a carriage 700 is rotatably supported on the carriage shaft 702. Timing pulleys 703a, 703b, 703c having the same number of teeth are fixed to the carriage shaft 702 at the left end, the right end, and between them.

Lens rotating shafts 704a and 704b are coaxially and rotatably supported on the carriage 700 so as to be parallel to the shaft 701 and invariable in distance. The rotation shaft 704b is rotatably supported by the rack 705, and the rack 705 is movable in the axial direction, and can be moved in the axial direction by a pinion 707 fixed to the rotation shaft of the motor 706. The lens can be held between the lens rotation axes 704a, 704b. Note that the lens rotation shaft 704a,
Pulleys 708a, 708b having the same number of teeth are attached to 704b, respectively, and are connected to pulleys 703c, 703b by timing belts 709a, 709b.

With the configuration as described above, the lenses held on the lens rotation shafts 704a and 704b are rotatable and the shaft
It is movable in the axial direction of 701, and is freely rotatable about the shaft 701. As a result, the lens can be moved to the chamfering position and rotated appropriately.

Next, a chamfered portion of the present embodiment will be described with reference to the drawings.

FIG. 1 is a side sectional view showing a chamfered portion of the embodiment.
FIG. 2 is a sectional view taken along the line AA, and FIG.
It is an arrow view.

 This device is incorporated in the main body of the balling machine.

A support base 101 is fixed to the main body base 1, and a rotation support base 102 is rotatably held on the support base 101 by a bearing. A rotating base drive motor 103 is attached to the support 101, and a gear 1 attached to the rotating shaft of the motor 103 is mounted.
04 and the gear 105 attached to the rotating support 102
The rotation of 103 is transmitted to the rotation support 102.

The transmission of the driving force to the rotating support 102 is not limited to the above, and the gear 1
04 and 105 may be replaced by timing pulleys and driven by timing belts.

An arm 106 is rotatably held on the rotation support base 102 by a bearing. A chamfering wheel driving motor 107 is attached to one end of the arm 106, and a pulley 108 is attached to a rotating shaft of the motor 107. The other end of the arm 106 is bent at a right angle, and the grinding wheel shaft 1 to which the chamfering grinding wheel portion 110 is attached.
14 is rotatably held by bearings. Chamfer whetstone
A cylindrical chamfering grindstone 111, a measuring cylinder 112 for measuring a lens corner, and a disk-shaped groove mower grindstone 113 are integrally attached to 110.

In this embodiment, the shape of the chamfering grindstone is cylindrical, but may be another shape, for example, a conical shape.

A pulley 115 is attached to the grinding wheel shaft 114
A belt 116 is stretched between 115 and the pulley 108. Thereby, the rotation of the motor 107 is transmitted to the chamfering grindstone 110. The motor 107 is mounted at a position that balances the chamfering grindstone with the rotation axis of the arm 106 as the center.

The pulley 108 and the pulley 115 may be timing pulleys, and the belt 116 may be a timing belt.

The transmission of the driving force to the grinding wheel shaft 114 is not limited to the belt, but may be a connection of a bevel gear and a shaft. Further, a motor in which the motor 107 is directly connected to the grinding wheel shaft 114 and the weight is fixed to the other end is also adopted. it can.

As shown in FIG. 2, the rotation support base 102 is provided with a rotation restricting portion 117 for the arm 106, and the arm 106 is always in contact with the rotation restricting portion 117 by a spring 118. When the lens comes into contact with the chamfering grindstone 111 and a force exceeding a certain level is applied, the arm 1
06 rotates in the direction that the grindstone moves away from the lens, preventing over-sharpening.

The number of the rotation restricting portion 117 and the spring 118 is not limited to one set, and if two sets are attached, the number of positions where the chamfering grindstone 111 can abut on the lens increases, and the chamfering grindstone 111 can be chamfered at two points facing each other.

The rotation support base 102 is arranged so that the rotation axis is on a tangent line passing through a point O on the outer peripheral surface of the chamfering grindstone 111, and the point O at which the lens abuts is always set regardless of the angle of the chamfering grindstone 111. It is in a fixed position.

A pulley 119 is attached to the rotation shaft of the arm 106. A potentiometer 121 is attached to an arm 120 extending from the rotation support base 102, and a pulley 122 is attached to a rotating shaft of the potentiometer 121. A wire 123 is stretched between the pulley 119 and the pulley 122, whereby the rotation amount of the arm 106 is measured by the potentiometer 121.

Needless to say, an encoder may be used instead of the potentiometer 121.

The operation of the present embodiment will be described below with reference to FIGS.

After beveling completion, for chamfering the rear, by the rotating support base driving motor 103 rotates the rotating support base 102, tilting the chamfering grindstone 110 by a predetermined angle theta _1. Next, the lens after the beveling is moved to a point O on the chamfering grindstone 111, and chamfering is performed when a predetermined amount is cut from the point O.

Here, the shape of the peripheral portion of the lens to be chamfered is known from the radius information of the lens frame or template and the edge thickness information of the processed lens, and the point O on the chamfering grindstone 111 is Since it is a fixed position regardless of the tilt angle of 110, a predetermined chamfering process can be performed by digitally controlling the lens axis and the carriage.

Since the chamfering grindstone 111 is pressed against the lens with a constant pressure, in the case of a circular lens, constant chamfering can be performed if the rotation of the lens axis is constant, but if the lens shape is not constant, the rotation of the lens axis If the speed is constant, the peripheral speed is not constant, so the rotation speed of the lens axis is changed according to the radial information. In addition, it is expected that the cutting amount of the grindstone will not be constant and the chamfer amount will change due to a lens measurement error, a beveling error, and the like. However, in this apparatus, when a force exceeding a certain force is applied, the arm 106 chamfers from the lens. If the grindstone 111 rotates in the direction away from it and the processing pressure is insufficient, the arm 106 rotates in the direction in which the chamfering grindstone 111 approaches the lens, so that constant chamfering can always be performed.

Furthermore, by measuring the peripheral portion of the beveled lens with the measuring cylinder 112, more accurate chamfering can be performed. Specifically, before chamfering, the chamfering grinding stone portion 110 is rotated to the position of the reference inclination angle theta _5, to move the position of the lens from the machining position x, y only (Figure 8), the measuring tube 112 equivalents Contact In this state, when the lens axis and the carriage are moved in accordance with the lens shape at the end of the beveling process measured and calculated on the ball-slider main body side, when the shape obtained by calculation is different from the actual shape, the measuring cylinder 112 is only Δd. Moving. More accurate chamfering can be performed by correcting the digital control amounts of the lens axis and the carriage based on the result of measuring Δd over the entire circumference.

When measuring Δd, the contact point of the lens is
It moves in the axial direction of 112, but it can be ignored because it is very small.

Thus, the processing at chamfering grindstone inclination angle theta ₁ is completed, the lens is once separated from the chamfering grindstone 111, tilting the chamfering grindstone 111 to a predetermined angle theta _2.

Thereafter, the same processing as in theta _1.

Then, since the front of the chamfering and processed similarly to the rotating theta ₁ of the chamfering grindstone 111 to theta _3.

In this embodiment, the case where the rear surface is chamfered with two surfaces and the front surface is chamfered with one surface has been described. However, various numbers of chamfers can be made according to the shape of the lens.

In the case of performing the groove machining, the chamfering grindstone portion 110 is rotated to the position of θ, and the peripheral edge of the lens after the flat machining is brought into contact with the groove moating grindstone 113 to perform the machining.

[Effects] As described above, according to the present invention, appropriate chamfering can be performed corresponding to spectacle lenses processed into various shapes. In particular, chamfering at different angles can be performed during lens processing, and two or more chamfers can be performed on the same corner. Further, it is possible to prevent an excessive load from being applied for various reasons, and to perform stable chamfering.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a chamfered portion of the ball mill according to the embodiment. FIG. 2 is a sectional view taken along line AA of FIG. 3, and FIG. 4 to 7 are explanatory views showing the state of chamfering or trenching, respectively. FIG. 8 is an explanatory view showing the operation of the measuring cylinder. FIG. 9 is a sectional view showing the carriage unit. DESCRIPTION OF SYMBOLS 1 ... Main body base 101 ... Support base 102 ... Rotating support base 103, 107 ... Motor 106 ... Relay member 110 ... Chamfering grindstone part 111 ... Chamfering grindstone 112 ... Measuring cylinder 113 ... Mizobori Whetstone

Claims (5)

(57) [Claims] 1. A chamfering mechanism of a ball milling machine which obtains radial information or template information of a lens frame of a spectacle frame and a peripheral shape of a lens to be worked, and cuts the peripheral edge of the lens to be processed to form a frame. An arm that supports the chamfering grindstone and is supported by the main body base; a grindstone rotating means for rotating the chamfering grindstone via a power transmission mechanism in the arm; and Angle changing means for changing the angle of the shaft independently of the undulation of the edge of the lens to be processed, and the chamfering grindstone based on the radius information or the template information and the peripheral shape of the lens to be processed. Control means for controlling the position of the lens to be processed to control the amount of chamfering, and load reducing means for reducing the load when a load exceeding a predetermined amount occurs during chamfering. Chamfering mechanism for ball mill . 2. The chamfering mechanism of a ball mill according to claim 1, wherein the angle of said shaft is changed by said angle changing means around a predetermined point on the outer peripheral surface of said chamfering grindstone. Chamfering mechanism of the sliding machine. 3. A chamfering mechanism for a ball-milling machine according to claim 1, further comprising a measuring section for measuring a position of a corner of the lens to be processed after finishing. Chamfer mechanism. 4. A chamfering mechanism of a ball milling machine which obtains radial information or template information of a lens frame of a spectacle frame and a shape of a peripheral portion of a lens to be processed and cuts the periphery of the lens to be processed to form a frame. An arm that supports the chamfering grindstone and is supported by the main body base; a grindstone rotating means for rotating the chamfering grindstone via a power transmission mechanism in the arm; and Angle changing means for changing the angle of the shaft independently of the undulation of the edge with respect to the lens to be processed, and measuring the position of the corner of the lens to be processed which is attached to the mounting shaft of the chamfering grindstone and which has been finished. And a control means for controlling the position of the lens to be processed with respect to the chamfering grindstone based on the position of the corner of the lens to be processed by the measuring unit and controlling the amount of chamfering. The face of the balling machine Taking mechanism. 5. A chamfering mechanism for a ball milling machine which obtains radial information or template information of a lens frame of a spectacle frame and a peripheral shape of a lens to be processed to cut and frame the periphery of the lens to be processed. An arm that supports the chamfering grindstone and is supported by the main body base; a grindstone rotating means for rotating the chamfering grindstone via a power transmission mechanism in the arm; and Angle changing means for changing the angle of the shaft independently of the undulation of the edge of the lens to be processed, and the chamfering grindstone based on the radius information or the template information and the peripheral shape of the lens to be processed. A chamfering machine for a ball mill, comprising: control means for controlling the position of the lens to be processed to control the amount of chamfering; and load maintaining means for maintaining a load generated during chamfering substantially constant. mechanism.