JPS614696A - Method of cutting end section of plastic lens - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for cutting plastic lenses.

Structure of conventional examples and their problems Conventional automatic cutting of plasti and crevices has mainly been performed using rotary blades, water jet removal, and laser cutting methods. However, when cutting with a rotating blade, there are various problems such as molten material adhering to the cut surface and making the cut surface inconsistent, water jet cutting causing some chipping, and laser cutting causing cracks and sagging of the cut surface. There was a drawback.

OBJECTS OF THE INVENTION The present invention obviates the above-mentioned conventional drawbacks and aims to provide a novel cutting method.

Structure of the Invention The present invention provides a rotary blade provided at the upper part of the end of a plastic lens, and an end of the plastic lens protruding in a direction perpendicular to the transport direction of the plastic lens.
While transferring the plastic lens, the plastic
Cutting the end of the plastic lens by tilting the outer peripheral surface of the rotary blade and rotating the rotary blade at an angle that prevents plastic from adhering to the cut end of the lens and melted material from the end of the lens. , the molten material tends to adhere. In addition, this is a method for cutting the ends of Plasti and 7-Clean lenses, which does not cause cracks or chips and ensures high quality and stable plastic lenses.

DESCRIPTION OF THE EMBODIMENTS An explanation will be given based on FIGS. 1 to 3. Reference numeral 1 indicates a plastic lens. 2 is the end of the plastic lens to be cut and is part of the gate during molding. 3 is a rotary blade and shows the positional relationship between the plastic lens 1 and the end portion 2.

FIG. 3 shows the overall configuration, and 4 is a jig for holding the plastic lens 1 and the end portion 2. Reference numeral 5 designates an air passage that suctions and holds the plastic lens 1 from within the jig 4, and 6 designates a plate that moves the jig 4.

(However, the moving means is not shown.) 7 is an adjustment nut for setting the inclination angle of the rotary blade 3, 8 is a driving body for rotating the rotary blade 3, and 9 is a holding bracket for the driving body 8. , 1o and 11 screws to make it movable. Reference numeral 12 denotes an elevating cylinder for elevating and lowering the rotary blade 3, and is guided by a guide 13.

The operation will be explained below.

When the plastic lens 1 placed on the jig 4 is fixed by suction force and the movable plate 6 starts moving, the rotary blade 3
is lowered by the lifting cylinder 12 and rotated by the driver 8 to cut the end 2 of the plastic lens 1 on the moving plate 6 at an appropriate moving speed. The rotary blade 3 is fixed with its inclination angle determined by an adjusting nut 7. The moving plate 6 is returned to its original state after it has completely passed through the rotary blade 3.

In addition, the rotary blade 3 moves in the direction of transport of the plastic lens 1,
By tilting the plastic lens by 1° to 3°, molten material tends to adhere when cutting the end of the plastic lens. Furthermore, it is possible to provide an optimal method for cutting the ends of plastic lenses and lenses, which ensures high quality and stable plastic lenses without cracking or chipping.

Effects of the Invention As described above, the plastic lens edge cutting method of the present invention uses a rotary blade provided at the upper part of the plastic lens edge and the plastic lens edge protruding in a direction perpendicular to the direction of conveyance of the plastic lens. On the other hand, while transferring the plasti and cremation, place the plasti on the cut part of the end.
This is a cutting method that involves rotating the rotary blade by tilting the outer peripheral surface of the rotary blade at an angle that allows the molten material to adhere. This eliminates the disadvantages of inconsistent cutting surfaces such as cracking, cracking, and sagging, and makes it possible to automatically cut plastic lenses.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the shape and cutting position of the plastic and clamp in the present invention, Fig. 2 is an explanatory diagram showing the relative relationship between the plastic lens and the rotary blade, and Fig. 3 is an explanatory diagram showing the relative relationship between the plastic lens and the rotating blade. FIG. 3 is a partially sectional front view of a plasti and cremmet cutting device. 1... Plastic lens, 2... End of the own plastic lens, 3... Rotating blade. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 3! , 5'

Claims (2)

[Claims] (1) A rotary blade is provided at the top of the end of the plastic lens, and the plastic lens is moved while the plastic lens is being transferred to the end of the plastic lens that protrudes in a direction perpendicular to the direction in which the plastic lens is transferred. The edge of the plastic lens is cut by tilting the outer circumferential surface of the rotary blade at an angle that prevents melted material from adhering to the end of the plastic lens and rotating the rotary blade. How to cut the lens end. (2) The method for cutting an end of a plastic lens according to claim 1, wherein the outer circumferential surface of the rotary blade is inclined at an angle of 1° to 3° with respect to the conveying direction of the plastic lens.