Pragati BTP-100, Инструкция по эксплуатации

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1. Principle of Working :
Three piece face gear coupling is the basic element used for indexing. Coupling design allows the tool disc to
be indexed without lifting. It also ensures high repeat positioning accuracy as well as rigidity.
3 phase electric torque motor drives the cam shaft through a system of gears. ‘Cam shaft’ drives the ‘follower
shaft’ in a non-uniform manner, similar to that of ‘Geneva’ mechanism. Cam shaft is also geared to the ‘drum
cam’ which controls clamping and release of the coupling.
Initial 90° (approximate) movement of cam shaft does not transfer any rotary movement to follower shaft.
However, the drum cam rotates through 30°, which movement releases the clamping force and pulls the sliding
coupling out of engagement. Further 180° (approx.) movement of cam shaft indexes the follower shaft through
90°, which in turn, indexes the turret by 30° or 45° depending on gear ratio. During this movement, drum cam
profile keeps the sliding coupling in dis-engaged position. In the final 90° movement of the cam shaft, the follower
shaft remains stationary. The drum cam pulls the sliding coupling into engagement and applies clamping force
through disc spring. One revolution of cam shaft completes one indexing cycle of declamp-index-clamp.
Absolute position encoder gives feed-back of the turret position. Proximity switch inspects the clamped position
of the turret.
FIG 1.1
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BI-DIRECTIONAL TOOL TURRET
1. Cam Shaft 2. Follower Shaft 3. Drum Cam 4. Fixed Coupling
5. Indexing Coupling 6. Sliding Coupling 7. Disc Spring 8. Torque Motor
9. Proximity Switch 10. Encoder
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