| 摘要 |
Adjustment of the station to suit different purposes is achieved by a variable height table(6) between the station base(4) and an upper cross beam(5). Table movement is achieved by a drive system(7) which is also used to vary the vertical position of the entire station structure(2) incorporating the guide pillars, base, upper cross beam relative to a fixed station frame(8). The drive system(7) comprises an eccentric shaft(9) with a connecting rod(10) supporting the table(6). The eccentric shaft is mounted in either the base or upper cross beam(5) and carries a cam disc(11) which is supported on the fixed station frame. The cam disc curve profile is shaped to produce opposing movement of the table and station structure(2) when the shaft rotates. A roll(12) on the station frame(8) contacts the cam disc. Movement of the station structure is aided by a weight compensating system, e.g. a mechanical, pneumatic or hydraulic spring or an opposing weight. Four linear guides(15) are located between the station structure, two allocated to the upper cross beam, two to the base and corresponding points on the machine frame. The station frame may also have a horizontal, linearly adjustable cam support(16) with a control profile(17) inclined to the horizontal and running on a roll(18) on the station frame. Adjustment of the cam support(16) is by a pneumatic or hydraulic cylinder or a linear motor. Several stop bolts(19) limit travel of the cam support and are arranged along the path of cam movement. |
