Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1982-07-12
1985-02-05
Olszewski, Robert P.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
B24B 1702
Patent
active
044971400
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a cam grinding machine for grinding a cam corresponding to a master cam and, more particularly, to a cam grinding machine which is capable of compensating for the lift error of a cam product due to wear of a grinding wheel.
2. Background Art
In general, in a system for grinding a cam upon a workpiece by reproducing or duplicating a master cam, a lift error is caused upon a cam product corresponding to the changes in the grinding point of the cam product and a wheel surface in accordance with alterations in the curvature of the grinding wheel which is caused by a reduction in its diameter due to wear of the grinding wheel.
In order to compensate for or eliminate the lift error due to grinding wheel wear, it has been proposed to alter the diameter of a cam roller which is brought into contact with the master cam when the diameter of the grinding wheel is reduced due to wear. As a means for altering or changing the cam roller diameter, various kinds of apparatuses have been proposed, such as disclosed in U.S. Pat. No. 3,844,068.
Such apparatuses are generally classified into first and second systems as described below. In the first system, two cam rollers of different diameters are mounted on a roller support wherein the cam rollers are adapted to be shifted relatively to the roller support to change over from the large diameter roller to the small diameter roller. However, the large diameter roller and the small diameter roller must be slid along the axial direction at the surface rotatably supporting the rollers, so that a relatively large clearance has to be maintained at the surface for rotatably supporting the rollers. As a result, this first system has a disadvantage in that the bearing rigidity of the rollers cannot be increased up to a high level.
In the second system, the roller support mounting the large and small diameter rollers is adapted to be shifted by an amount equal to one half of the pitch of the master cams so as to change over from the large diameter roller to the small diameter roller. Further, in this system, a star gear and a dog are provided respectively on a traverse table and a bed so that the cam rollers are shifted by an amount equal to the pitch of the master cams to contact the master cams on after another each time the traverse table is indexed. Therefore, in order to accomplish the above changing over process, the star gear must be released from the engagement with the dog so as to rotate the star gear independently, or, in the case where the star gear is always engaged with the dog, a shaft of the star gear must be axially shifted so as to release meshing of a rack provided on the roller support with a gear mounted on the shaft of the star gear and to rotate an intermediate gear meshing with the rack.
In the former case where the shaft of the star gear is not locked, the location of the cam rollers with respect to the master cam would be out of proper alignment if the star gear were rotated by exertion of an external force, introducing fears of introducing problems to the cam grinding process. Also, in the latter case where the star gear is always engaged with the dog and the roller support is shifted after temporarily releasing the coupling of the rack with the star gear shaft, there is a fear that phase in meshing of the rack and the gear of the star gear shaft will be changed when the rack is recoupled with the star gear shaft, resulting in a problem similar to that experienced in the former case where the star gear shaft is not locked.
DISCLOSURE OF THE INVENTION
The present invention is to permit changing over from the large diameter roller to the small diameter roller without releasing meshing of the gears while locking the shaft of the star gear in the above-mentioned second system, that is, in such a system that the roller support itself is shifted not only to bring a cam roller into engagement with master cams upon indexing of the traverse table but also change over the cam rollers, thereby to overco
REFERENCES:
patent: 2621544 (1952-12-01), Rossmann
patent: 3088335 (1963-05-01), Bullard
patent: 3621614 (1971-11-01), Hikita et al.
patent: 3683558 (1972-08-01), Oishi
patent: 3844068 (1974-10-01), Shiga et al.
patent: 3861484 (1975-01-01), Joslin
patent: 4121385 (1978-10-01), Asano
patent: 4358911 (1982-11-01), Vogelsanger
Koide Tsuyoshi
Maruyama Toshio
Tsujiuchi Toshio
Olszewski Robert P.
Toyoda Koki Kabushiki Kaisha
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