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Shizuoka-shi, Japan

Muditha Dassanayake K.M.,Sankyo Seisakusho Co. | Cui C.,Tokyo University of Agriculture and Technology | Tsutsumi M.,Tokyo University of Agriculture and Technology
International Journal of Mechatronics and Manufacturing Systems | Year: 2011

Multi-tasking turning centre has ten inherent deviations which were identified by considering the axis configuration and mutual motions of axes. To estimate all these deviations, in this paper, a new methodology which is based on simultaneous three-axis motion technique is proposed. The effects of deviations on predefined trajectories were investigated by simulations. Five measurements which were extracted by conducting four simultaneous motions were used in the identification algorithm. All the ten inherent deviations were estimated accurately by means of the centre offset values of the trajectory measurement. Furthermore, the effects of setting errors of balls of ball bar and clamp-unclamp process of B-axis on measurement were discussed and eliminating techniques were proposed. All the results were verified by means of simulations and experiments. Based on the results, it can be said that the proposed method can be used as an accuracy evaluation and identification tool for multi-tasking turning centres. Copyright © 2011 Inderscience Enterprises Ltd. Source


Dassanayake M.K.M.,Sankyo Seisakusho Co. | Tsutsumi M.,Tokyo University of Agriculture and Technology
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2010

In this paper, the motion performances of the two rotary tables which are driven by roller gear cam and direct drive motor are measured and compared. The table with roller gear cam was controlled in semi-closed loop and full-closed loop methods while the other was controlled only in full-closed loop method. In the measurements, the positioning accuracy and repeatability, rotational fluctuation, frequency response, step response and etc of the systems were measured. All these tests were carried out without any kind of compensation methods such as pitch error or cogging torque compensation etc. Three rotary encoders for rotary table with roller gear cam and one rotary encoder for rotary table with direct drive motor were used for measurements. Furthermore, the simulations were carried out by mathematical models and the results were compared with measured results. The comparison shows that the measured and simulated results have a good agreement. From the simulation results, the friction torque was identified and also compared. The results imply that though both the tables show high performances, the performances of the rotary table driven by roller gear cam are comparatively higher than that of rotary table driven by direct drive motor. Key words: five-axis machine, accuracy, control, roller gear cam, direct drive motor, rotational fluctuation, positioning accuracy, repeatability, frequency response. ©2010 by ASME. Source


Patent
Sankyo Seisakusho Co. and Kabushiki Kaisha Yaskawa Denki | Date: 2012-01-11

The disclosure discloses a rotating electrical machine that is integrally formed with a reduction device having an input shaft to which a roller gear cam is provided and an output shaft to which cam followers configured to sequentially engage with the roller gear cam is provided on an outer periphery, extending along a direction orthogonal to the input shaft, and is configured to employ one of a field system or an armature as a rotator and the other of the field system or the armature as a stator, including a rotating shaft that is fixed to the rotator and integrally formed as a single shaft with the input shaft of the reduction device.


Patent
Sankyo Seisakusho Corporation and Tokyo Electron | Date: 2011-09-14

A transfer device can control a posture of a holding table accurately and prevent the holding table from wobbling even when the holding table is moved at a high speed. A first posture holding link


Patent
Sankyo Seisakusho Co. | Date: 2012-11-28

A crossed roller bearing, including: an inner element and an outer element that relatively rotate, the inner element including an annular inner V-groove that is provided along an outer peripheral surface of the inner element and that has a V shape that opens towards the outer element, the outer element including an annular outer V-groove that is provided along an inner peripheral surface of the outer element, that has a V shape that opens towards the inner element, and that faces the inner V-groove; a plurality of cylindrical rolling elements that are placed between the inner V-groove and the outer V-groove, that roll while being in contact with the inner V-groove and the outer V-groove, and adjacent rolling elements of which have rolling axes that are perpendicular to each other; and a retainer that are placed between the adjacent rolling elements that includes a flat section that is a projecting central section on an area which faces either one of the rolling elements and that is capable of contact with the rolling element, and a tilt section whose degree of projection becomes smaller as it goes from the flat section to an end section of the retainer.

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