Motor controller for a dental handpiece
AssigneeKabushiki Kaisha Morita Seisakusho
InventorsHiroaki Kusakabe, Kazunari Matoba, Masanobu Yoshida
Life of this patent
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Abstract
A motor controller for a dental handpiece comprising a torque detection means for detecting the load torque applied to a cutting tool, and a control means for stopping a cutting tool drive motor, reducing the rotation speed of the motor or temporarily reversing the motor when the detected load torque has reached a preset reference torque. With this controller, a cutting tool such as a relatively slender file for root canal formation can be prevented from breaking. In addition, the operability of the handpiece can be improved, and operation such as root canal formation can be conducted easily.
Claims26
A dental handpiece for forming root canals comprising a cutting tool for forming root canals, a drive motor for driving said cutting tool, a torque detection means for detecting a load torque applied to said cutting tool, and a control means for automatically stopping said drive motor, stopping said drive motor for a short time after reducing a rotation speed of said drive motor, and reversing said drive motor when a detected load torque has reached a preset reference torque, and a reference torque setting means for setting said preset reference torque.
A dental handpiece for forming root canals comprising a cutting tool for forming root canals, a drive motor for driving said cutting tool, a torque detection means for detecting a load torque applied to said cutting tool, a position detection means for detecting a position of said cutting tool also used as a root canal length measurement electrode, a control means for automatically stopping said drive motor or stopping for a short time said drive motor after reducing the speed of said drive motor and reversing rotation of said drive motor when a detected load torque has reached a preset reference torque or when said cutting tool has reached a preset reference position, a reference torque setting means for setting said preset reference torque, and a reference position setting means for setting said preset reference position.
A dental handpiece for forming root canals comprising::
- a cutting tool for forming root canals;
- a drive motor for driving said cutting tool;
- a position detection means which uses said cutting tool as an electrode that measures a length of said root canals, said position detection means further detecting a position of said cutting tool;
- a control means for automatically stopping said drive motor or stopping said drive motor for a short time after reducing the speed of said drive motor and reversing the rotation of said drive motor when said cutting tool has reached a preset reference position;
- and
- a reference position setting means for setting said preset reference position.
Dependencies are inferred from the claim text.