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公开(公告)号：US20200058321A1
公开(公告)日：2020-02-20
申请号：US16348088
申请日：2017-10-23
Inventor： Tomoyuki YAMASHIRO , Takaaki KUMAZAWA , Takeru SAKAMOTO
Abstract: A tonearm unit includes: an arm member having a tip to which a cartridge is attached; and a raising and lowering mechanism which raises and lowers the arm member with respect to a phonograph record along an axis. The raising and lowering mechanism includes: a cam base supporting the arm member; a ring cam provided to be rotatable about the axis with respect to the cam base; a first guide portion on the cam base, extending at an angle along a rotation direction of the ring cam; and a second guide portion on the ring cam, extending at an angle along the rotation direction so as to face the first guide portion. When the ring cam rotates with respect to the cam base, the cam base is raised and lowered with respect to the ring cam as a result of the second guide portion sliding along the first guide portion.
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公开(公告)号：US20220036917A1
公开(公告)日：2022-02-03
申请号：US17276456
申请日：2019-09-17
Inventor： Masayuki SHIWA , Tomoyuki YAMASHIRO
IPC: G11B3/085
Abstract: A lifter mechanism includes: a first lifter; a second lifter; a first biasing member that biases the second lifter from a second lower limit position toward a second upper limit position; a locking lever that is displaced between a locked position in which the locking lever locks the second lifter in the second lower limit position and a released position in which the locking lever releases the lock of the second lifter from the second lower limit position; a second biasing member that biases the locking lever from the locked position toward the released position; a holding member that holds the locking lever in the locked position; and a queueing lever that pushes down the second lifter from the second upper limit position to the second lower limit position.
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