| 摘要 |
A pick-up arm rotary pivot bearing structure is disclosed, which comprises a cylindrical base rigidly provided in the upper portion with a crosswisely extending support beam, an upstanding pivot shaft centrally secured on the support beam, a pair of upper and lower cylinders coupled with each other by stems extending astride of the support beam and having an upper and a lower bearing element secured centrally thereof to be positioned opposedly to the both extremities of the pivot shaft, and a bracket having an arm-pipe and a balance weight mounted thereon and linked relative with upper cylinder.
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