| 摘要 |
The device has a belt idler device (200) with a flexible arm (201). The arm is bent in horizontal plane in which a carriage (102) is moved. Moment of inertia of an upright section of the arm along a horizontal axis is greater than moment of inertia of the upright section along a vertical axis. The arm has an end with a vertical axle to support a pulley (106). A pin spring (300) has two branches situated on both sides of the pulley.
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