| 摘要 |
A brush pressure control system for a cleaning, sweeping or scrubbing machine comprises a machine frame (16 figure 2) supporting a brush head 27, an actuator 10 for raising and lowering the brush head mounted between the frame and the brush head, an elongate balance beam 32 pivotally connected to the frame and connected at one end to the actuator for movement therewith and at the other end having a counterweight 35 mounted thereon. The mass of the counterweight is equivalent to the mass of the brush head. The brush head is also supported by the frame through a parallelogram linkage 38. A means may be provided to measure and display the wear of a brush on the brush head, such a load sensor (20 figure 1) which registers when a positive pressure is applied to the brush head and pauses the actuator while a potentiometer 37 senses the movement of the balance beam as the brush head is raised and lowered. |
