Standards & Others -CHUO PRECISION INDUSTRIAL CO.,LTD.-

Standards & Others

Patents

HG-VCR method
Combination coupling mechanism
Fix stage

HG-VCR method

This is an original guiding method of Chuo Precision Industrial. It is developed with an aim to further improve the performance of V-CR method.
It is called “HG-VCR.”
It narrows the space between rollers as small as possible in order to increase a number of arrays to the maximum. There arrays are held by the retainer. High pre-compression can be applied, and it is compact and super high rigid.
It is applied for our new automatic and manual stages, and is good for precise positioning for sensors, cameras, production machines, and inspection machines, and for measurements.
In addition, because of its rigidity, it is available for various applications that have offset load.

This “HG-VCR” is in patent pending condition.
Patent No. 2006-070036

Complex practice

Features of the complex coupling mechanism

The complex coupling mechanism is driven by a feed screw and a specially designed coupling part. When compared with conventional technology, this design has the following features:

• Higher resolution when compared with the worm gear method.
• It absorbs rotation unevenness by free movement of special interconnecting parts.
• The small drive torque enables smooth movement.
• Durability is improved due to having a larger contact surface area than worm gears.
• Because it does not use the spring, reliable feeding is available.
• By changing the feed screw lead, the resolution and movement speed can be varied.

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Positioning errors

When the straight line motion is converted into angular motion, there are angular positioning errors along the tangent curve between the amount of feed screw movement and the tilting part that actually moves, as well as along the sine curve of the distance between the feed screw and the tilting part. However in reality, microscopic positioning errors are within ±3° of the amount of movement which is much less that the ±5° you get with worm gear positioning. It is also possible to achieve high positioning precision by performing error compensation.

You can obtain above values by using the following equation.
　　・Positioning error in a distance between the feed screw and the oblique section (“n” presents the transfer amount of the feed screw)
　　　　　Positioning error = sin^-1(1㎜/100㎜) × n-sin^-1(n/100㎜)
　　・Positioning error between the transfer amount and the actually moving oblique section (“n” represents the transfer amount of the feed screw)
　　　　　Positioning error = tan^-1(1mm/100mm) × n-tan^-1(n/100mm)

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Patent

The “Complex Coupling Mechanism” has been registered under patent number 3848304 as a “Table position adjuster”.

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Fix Stage

It is a stage that does not move after the adjustment.

Mechanism of fixation after adjustment

・To move the fix stage, a hex wrench is necessary.
・Shaking the stage with hands rarely move the stage.
　It does not move even without clamping.
　


Put the pick tester on the stage, so the stage movement can be checked.	The stage is moved by using a hex wrench. It can be confirmed that the pick tester scale moved.	Then, the pick tester scale does not move even the stage is held with hands and shaken hardly.

Any of the following experiences?

Taking time to adjust the positions of the sensor, and other components, adjustment is carried out with extreme care, and the test is passed.
Clamping is conducted at last and finished.
However, while clamping, the sensor moved a bit, and re-adjustment became necessary.

Isn’t there any other way than clamping for fixation of the stage?
This fix stage was developed by taking in the idea like this.

Feature of the fix stage

It is preventing a backlash with an auto lock method (patent pending).
Interfusion of foreign object does not occur because of the direct-acting type guide with a special structure (patent pending).
It has the minimally-required functions for the position adjustment, and it is low price.
It is good for works that should not be moved after position adjustment, such as a camera or a sensor, rather than the ones that require position adjustment.

Example of application

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