US Patent No. 10,798,811

INSERTION DEVICE


Patent No. 10,798,811
Issue Date October 06, 2020
Title Insertion Device
Inventorship Hideo Kitamura, Kobe (JP)
Shinsaku Mizumoto, Suita (JP)
Assignee HITACHI METALS, LTD., Tokyo (JP)

Claim of US Patent No. 10,798,811

1. An insertion device comprising:a first magnet array comprising a plurality of magnets placed in an array;
a first magnet supporting member adapted to support the first magnet array mounted to the first magnet supporting member;
a second magnet array comprising a plurality of magnets placed in an array and being faced to the first magnet array with a gap interposed therebetween;
a second magnet supporting member adapted to support the second magnet array mounted to the second magnet supporting member;
a gap driving mechanism for driving the first magnet supporting member and/or the second magnet supporting member in a direction in which the first and second magnet arrays are faced to each other, in order to change a size of the gap;
a first coupling beam coupled integrally to the first magnet supporting member;
a second coupling beam coupled integrally to the second magnet supporting member;
a driving conjunction mechanism for coupling at least one of the first coupling beam and the second coupling beam to the gap driving mechanism;
a compensation spring mechanism adapted to act in such another direction as to cancel an attractive force acting between the first magnet array and the second magnet array; and
a spring conjunction mechanism for coupling the compensation spring mechanism and the first and second coupling beams to each other,
wherein
the spring conjunction mechanism includes:
a first spring supporting frame coupled, through a first coupling portion, to one of the first coupling beam or the second coupling beam,
a second spring supporting frame coupled, through a second coupling portion, to an other one of the first coupling beam or the second coupling beam, and
a guide mechanism for guiding relative movement of the first spring supporting frame and the second spring supporting frame, in the direction in which the magnet arrays are faced to each other,
the compensation spring mechanism is mounted to both the first spring supporting frame and the second spring supporting frame and, when the size of the gap is changed, the first spring supporting frame and the second spring supporting frame move relative to each other in the direction in which the magnet arrays are faced to each other, so that the compensation spring mechanism operates.