Sharp TMV Series Service And Parts Manual page 29

Spindle speed change
(a) TMV-185VS
By means of the variation of one set of sliding belt pulley and counter shaft gear (high or low speed),
the spindle revolution speed is changed accordingly.
(1) Change of High and Low Speeds:
The speed change may be effectuated by the chosen high and low speed lever (figure 15 (J)). When (J)
is engaged in the right front, it is for the high speed and the spindle may rotate as high as 500 to
3,000RPM. When (J) is positioned at the right rear, the spindle may have a speed of 60-580RPM. The
neutral lever position is in the right down.
Note: a. The spindle must be motionless completely during the speed change.
b. To shift the high speed into the low one, the spindle must be slightly turned to
make it easier for the back-row gear to engage.
c. To shift the low speed into the high one, use the brake lever so as to put a stop to
the spindle clutch. Then, turn the spindle slightly so that the clutch may be
engaged feasibly. A "click" sound of engagement may be sensed at this moment.
d. The direction of low speed rotation is opposite to that of the high speed. By the
reversing switch, the direction may change to that of the high speed revolution.
(2) Speed Change Handwheel:
Stepless speed variation between high and low speeds may be controlled by means of the turning
handwheel (Figure 15(G)). When it is turned clockwise, it is for higher speed, and vice-versa.
Note: a. Do not change the speed when the spindle stands still.
b. Avoid using it when the speed is in excess of 3,000RPM.
c. In the process of speed change from high speed to low speed, and vice-versa, do not
change the speed rapidly to safeguard the service life of the internal mechanism.
d. It takes roughly 10 to 15 minutes to change from low speed to the high one, and vice
versa.
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Figure 15