| 摘要 |
PROBLEM TO BE SOLVED: To vary amplitude simply and surely even during an operation by moving connection bearings for receiving proximal ends of a pair of sliding shafts by moving back and forth an outwardly protruding control axis thereby to vary amplitude. SOLUTION: For varying amplitude during an operation, if a control axis 22 protruding from a conversion casing, for external operation, is moved back and forth, a connection bearing 23 integral to the axis 22 moves and two sliding shafts 20 disposed on both sides of the bearing 23 each move back and forth. That is, if the shafts 20 move, control pins 27 normal, to the shafts 20 are linearly moved, and hence an engaging point of a torsion cam groove of an amplitude outer cylinder axis 16 being X-shaped engaging points 26, 26 for guiding the pins 27 and a torsion cam groove of an inner cylinder axis 18 slips, whereby an unbalance outer cylinder axis and unbalance inner axis on the side of each vibrator for transmitting rotation to the axis 16 and the axis 18, respectively, through timing belts rotate in opposite directions to each other so that phases of eccentric weights of both the axes are automatically varied and amplitude is changed. |
