DRIVE SYSTEM AND CONTROL METHOD FOR CHUCK DEVICE

• Main Authors: MASAYUKI ISHIKAWA, TAKEHIKO KANAZAWA, HISASHI YAJIMA, GEN TSUCHIYA
• Format: Patent
• Language: English; Korean
• Published: 07.12.2020
• Subjects: BLASTING; CHAMBERS PROVIDED WITH MANIPULATION DEVICES; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HAND TOOLS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MANIPULATORS; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PORTABLE POWER-DRIVEN TOOLS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TRANSPORTING; WEAPONS

An objective of the present invention is to provide a drive system of a chuck device and a control method thereof which can easily and precisely stop fingers at any position. The drive system (10) for driving a chuck device (12) comprises a controller (16) and a switch valve (14) to switch a supply state of compressed air to the chuck device (12) based on a valve command signal from the controller (16). The switch valve (14) consists of a five-port servo valve. During switching of a closing position of first and second fingers (26, 28) to an opening position, when the axial position of a piston (20) reaches a switching position (E) preceding a target position (D) at which the first and second fingers (26, 28) are at any middle positions by a prescribed distance (L), the switch valve (14) is opened to a third opening degree (Vc) for a prescribed time (t) and then opened to a fourth opening degree (Vd) to stop the supply and discharge of compressed air. Accordingly, the first and second fingers (26, 28) are stopped at the middle positions. 척 장치(12)를 구동하기 위한 구동 시스템(10)은, 컨트롤러(16)와, 이 컨트롤러(16)로부터의 밸브 명령신호에 근거하여 상기 척 장치(12)로의 압축에어의 공급상태를 전환하는 전환 밸브(14)를 구비하며, 상기 전환 밸브(14)는 5포트 서보 밸브로 이루어진다. 그리고, 제1 및 제2 핑거(26, 28)의 폐쇄위치에서 개방위치로 전환시키는 도중에 있어서, 피스톤(20)의 축방향 위치가, 제1 및 제2 핑거(26, 28)가 임의의 중간 위치로 되는 목표 위치(D)보다 소정 거리(L)만큼 앞서는 전환 지점(E)에 도달했을 때, 전환 밸브(14)를 제3 개도(Vc)로 소정 시간(t)만큼 개방한 후에, 제4 개도(Vd)가 되도록 전환시켜 압축에어의 공급 및 배기를 정지한다. 이것에 의해, 제1 및 제2 핑거(26, 28)가 중간 위치에서 정지된다.