| 摘要 |
A belt drive system for a mechanical cleaning device that require counter-rotating brushes and/or scrubbers, comprising two belts 42 and 44, a drive shaft 36, a pulley 32, and two rotary brushes 22 and 24. The first belt 44 engages drive shaft 36 and rotary brush 24 by friction contact and transfers rotary power from shaft 36 to rotary brush 24 through the rotation of belt 44. The second belt 42 engages pulley 32 and rotary brush 22 by friction contact so that they turn together. Pulley 32 is positioned relative drive shaft 36 so that the exterior surface of first belt 44 engages the exterior surface of second belt 42 by friction contact. Rotary power is thereby transferred from belt 44 to belt 42 by this friction contact between the two belts. Because the exterior of two belts 42 and 44 are in friction contact they must the must rotate in opposite directions and thereby drive rotary brushes 22 and 24 in opposite directions, respectfully.
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