Toyoda Koki Kabushiki Kaisha

Shoji Inagaki

Minoru Enomoto

Masashi Ito

Yasuhiro Okada

Fumio Sakamoto

Fuyuhiko Yoshikura

Noritaka Ise

A clamping device which holds a workpiece at a predetermined position during a machining operation of the workpiece comprises a clamper for clamping a workpiece, a feed device for moving the clamper in the axial direction, a load sensor which is fixed to the clamper and detects a clamping force acting on the workpiece, and a memory in which a target clamping force corresponding to the shape of the workpiece and a method of machining operation is stored. The control device compares the clamping force detected by the load sensor with the target clamping force stored in the memory and controls the clamper in response to the deviation between the detected clamping force and the target clamping force. The clamping device also has a position detecting means for detecting the axial position of the clamper. The control device compares the present position detected by the position detecting means with a stop position which is detected during the initial clamping and is stored in the memory, and controls the clamper in proportion to the deviation between the detected position and the stored stop position.

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Anjo, Japan

Shoji Inagaki