JPH0999267A - Lens centering device of lens blackening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a centering device with an extremely small number of parts and to obtain a blackening device capable of being easily formed at a low cost. SOLUTION: A centering roller 2 to be brought into contact with the periphery of a work lens 1 to be blackened is rotatably mounted on the tip of a centering beam 3 with the center axis 5 as the center. The beam 3 is supported by a moving mechanism 4 and capable of being slid in the direction of the arrow 6. The lens 1 is sucked and mounted on a lens holder capable of sucking and rotating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens centering device for a lens sanitizer that applies ink to the peripheral portion of a lens.

[0002]

2. Description of the Related Art Conventionally, various devices have been developed for black ink applicators. Therefore, various methods are also used for the centering method of the work lens. For example, JP-A-3-29645
The following inventions have been proposed in Japanese Patent Laid-Open Publication No. 9-29242. The invention described above, as shown in FIG. 8 and FIG.
Reference numeral 1 denotes a first sanitizing head 63 that applies ink around the work lens 62, a second sanitizing head 64 that applies ink around the work lens 62 from the other side, and a first centering head 65.
A second centering head 66 and a lens holder 67 for rotatably sucking the work lens 62.

The first centering head 65 is a flat rectangular parallelepiped head body 68, a slider 69 that supports the head body 68 so that it can reciprocate, an air cylinder 70 that moves the head body 68, and a head body. And a micrometer 71 that defines the forward movement position of 68. The second centering head 66 has a head main body 72 having a V block 72a protruding symmetrically from the center position at its tip, a slider 73 supporting the head main body 72 so as to be capable of reciprocating, and the air cylinder 70. The air cylinder 74 is configured to move the head main body 72 with a small actuating force.

In the apparatus having the above structure, first, the lens holder 6
The work lens 62 is set to 7. Next, the head main body 68 of the first centering head 65 is moved forward so that the tip end surface thereof is brought into contact with the outer peripheral surface of the work lens 62 at one point. At this time, the head body 68 is positioned by the micrometer 71. Then, the head main body 72 of the second centering head 66.
And the V block 72 at the tip of the head body 72
The inclined surface of a hits the outer peripheral surface of the work lens 62 at one point, and the work lens 62 is positioned.

As described above, the pair of centering heads 6
5, 66 allows the work lens 62 to be accurately centered. After that, the centered work lens 62 is redacted on its peripheral portion by a pair of redacting heads 63 and 64.

[0006]

However, the above-mentioned prior art has the following drawbacks. That is,
A complex combination of a precision-machined V block, a sliding slider that moves it back and forth, an air cylinder that is a drive source, a micrometer for positioning, and an air cylinder that presses the work lens from the facing position of the V block. It has become a structure. Therefore, it is difficult to assemble, and the cost increases significantly.

It is an object of the present invention to provide a lens centering device for a lens blackening machine which has a structure in which inexpensive parts are combined and which is easy to assemble and low in cost.

[0008]

According to a first aspect of the present invention, there is provided a centering rod having a means for holding and rotating a work lens, and a contacting portion for the work lens is a rotating mechanism, and the centering rod is a lens. A lens centering device for a lens blackening machine, comprising: a moving mechanism for moving back and forth in a direction orthogonal to a central axis. The invention according to claim 2 is the lens centering device of the lens blackening machine according to claim 1, wherein the centering rod has a positioning mechanism that regulates the forward movement position.

1 to 3 are conceptual views of the present invention, FIG. 1 is a side view, FIG. 2 is a plan view in which a work lens is attached by suction, and FIG. 3 is an explanatory view showing a centering operation. . Reference numeral 1 denotes a work lens to be redacted, and a centering roller 2 as a rotating mechanism that comes into contact with the outer peripheral surface of the work lens 1 is rotatably attached to the tip of a centering rod 3 about a center axis 5 thereof. . The centering rod 3 is supported by the moving mechanism 4, and is shown in FIG.
It is provided so as to be slidable in the direction of the arrow 6 in the inside.
Work lens 1 is a lens holder 1 that can be sucked and rotated.
2 is attached by suction.

As shown in FIG. 3, in the apparatus having the above structure, first, the work lens 1 is placed on the upper end of the lens holder 12.
Place and attach by suction. At this time, the central axis of the work lens 1 is eccentric by e with respect to the central axis of the lens holder 12. Therefore, while rotating the lens holder 12, the centering rod 3 is moved forward to bring the centering roller 2 into contact with the outer peripheral surface of the work lens 1. The centering roller 2 comes into contact with the most eccentric portion of the work lens 1, and gradually brings the center axis Q of the work lens 1 closer to the center axis O of the lens holder 12. Finally, the center axis Q of the work lens 1 is aligned with the center axis O of the lens holder 12 for centering.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 4 to 6 show this embodiment, FIG. 4 is a side view, FIG. 5 is a plan view, and FIG. 6 is an explanatory view. Reference numeral 1 denotes a work lens to be redacted, and a centering roller 2 as a rotating mechanism that contacts the outer peripheral surface of the work lens 1 has a central axis 5
It is rotatably attached to the tip of the centering rod 3 about. The material of the centering roller 2 is made of hardened hard steel, but may be made of plastic.

The centering rod 3 is supported by the pulse stage 4 and is provided so as to be slidable in the direction of arrow 6 in FIG. The pulse stage 4 is fixed to the upper surface of the ball nut screw 9. The ball nut screw 9 is movably attached to the base plate 7 via the sliders 8 and 8a. A ball screw 10 is screwed into the ball nut screw 9. The ball screw 10 is connected to a servomotor 11 controlled by a controller (not shown), and the ball nut screw 9 moves when the ball screw 10 is rotated by the servomotor 11.

The work lens 1 is suction-held by a lens holder 12. The lens holder 12 is attached to a rotatable rotating shaft 13. A V-pulley 14 is fixedly mounted on the rotary shaft 13 above the lens holder 12.
A V belt 15 is stretched around the V pulley 14,
The rotating shaft 13 is configured to rotate by the belt 15. Reference numeral 16 is a suction hole penetrating the lens holder 12 and the rotary shaft 13, and the suction hole 16 is configured to suck and hold the work lens 1 by a vacuum device (not shown).

The operation of the device having the above structure will be described below. In order to perform good redaction, work lens 1
The center of the lens holder and the center of the lens holder 12 must be aligned. However, as shown in FIG. 6, the work lens 1 sucked and held by the lens holder 12 normally has the center Q of the work lens 1 deviated by e from the rotation center O of the lens holder 12. . Therefore, the work lens 1 must be centered.

In the centering of the work lens 1 in this embodiment, first, the lens holder 12 is rotated and the pulse stage 4 is operated to bring the centering rod 3 closer to the work lens 1. At this time, if the center Q of the work lens 1 is displaced by e with respect to the center O of the lens holder 12, the outer peripheral end of the centering roller 2 is closer to the radius of the work lens 1 than the center O of the lens holder 12. It comes into contact with the outer circumference of the work lens 1 at the position of D / 2 + e.

Further, when the centering rod 3 is gradually moved toward the center O of the lens holder 12, the outer circumference of the work lens 1 makes one revolution and comes into contact with the outer peripheral end of the centering roller 2 again. At this time, since the centering rod 3 also moves toward the center O of the lens holder 12 while the work lens 1 makes one rotation, the center Q of the work lens 1 moves toward the center O of the lens holder 12 by the movement amount during this time. Will be moved.

As described above, when the centering rod 3 is gradually moved closer to the rotation center O of the lens holder 12, the center Q of the work lens 1 is gradually set to the rotation center O of the lens holder 12. Approaching. When the outer peripheral end of the centering roller 2 approaches the position of the radius D / 2 of the work lens 1 from the center O of the lens holder 12, the center O of the lens holder 12 and the center Q of the work lens 1 are aligned, and the centering is performed. Is completed.

A method for determining the position of the radius D / 2 of the work lens 1 can be set by programming the movement of the pulse stage 4 in advance. Further, the completion of the centering of the work lens 1 may be visually confirmed. It can be done more accurately if measured with a dial gauge, etc., rather than visually. After the centering of the work lens 1 is completed, the pulse stage 4 is retracted, and the next step of blackening is performed.

The centering roller 2 is rotatably attached to the centering rod 3 when the centering roller 2 contacts the work lens 1 during centering. By rotating lightly, the contact resistance is reduced and the core is easily exposed. If the centering roller 2 does not rotate smoothly, the contact resistance between the work lens 1 and the centering roller 2 becomes large, and the work lens 1 may be abnormally displaced from or fallen from the work holder 12. Become.

According to this embodiment, the centering can be performed only by using extremely simple parts such as the centering roller and the centering rod, and the device can be manufactured at low cost. Further, since the centering rod is mounted on the same stage as the pulse stage of the blacking unit, the moving speed of the centering rod can be adjusted freely. Also, the stop position of the centering rod when the centering is completed can be freely fine-tuned by the pulse control of the servo motor. Further, even when the outer diameter of the work lens is changed, the stop position of the centering rod can be programmed in advance, and the setup can be changed extremely easily.

(Embodiment 2) FIG. 7 is a partial side view showing this embodiment. The present embodiment is different in that the centering roller 2 at the tip of the centering rod 3 in the first embodiment is eliminated, and a rotating steel ball 21 is provided at the tip of the centering rod 3 as an alternative rotating mechanism. Since the above-mentioned configuration is composed of the same components, the same numbers are given to the same components and the description thereof is omitted. The rotating steel ball 21 is embedded in the tip of the centering rod 3 so as to rotate smoothly without rattling, and is mounted by caulking or the like.

In this embodiment, as in the case of the first embodiment, good centering is possible, and the function and effect thereof are the same as those of the first embodiment, and therefore detailed description thereof will be omitted.

[0023]

The effects of the first to third aspects of the invention are that the centering device is composed of a very small number of parts, so that it is possible to provide a sanitizing device that is easy to manufacture and low in cost.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the present invention.

FIG. 2 is a conceptual diagram of the present invention.

FIG. 3 is a conceptual diagram of the present invention.

FIG. 4 is a side view showing the first embodiment.

FIG. 5 is a plan view showing the first embodiment.

FIG. 6 is an explanatory view showing the first embodiment.

FIG. 7 is a partial side view showing a second embodiment.

FIG. 8 is a perspective view showing a conventional example.

FIG. 9 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Work lens 2 Centering roller 3 Centering rod 4 Pulse stage 5 Rotating shaft 12 Lens holder

Claims (2)

[Claims] 1. A centering rod having a means for holding and rotating a work lens, and a contact portion to the work lens is a rotating mechanism, and a movement for moving the centering rod back and forth in a direction orthogonal to the lens center axis. A lens centering device for a lens sanitizing machine, comprising a mechanism. 2. The lens centering device for a lens blackening machine according to claim 1, wherein the centering rod has a positioning mechanism that regulates a forward movement position.