Maintenance and inspection procedures 5-87
(3) Inspection, maintenance and replacement of J3-axis timing belt (RV-4F/7F series only)
The reference figure at inspection, adjustment, and replacement of the timing belt is shown in
.
Fig.5-7 : Inspection, maintenance and replacement of J3 axis timing belt
■ Inspecting the J3 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to
Page 82, "5.3.2 Installing/removing the cover"
, and remove the No. 1 arm cover L.
3) Visually confirm that the symptoms indicated in
"(1)Timing belt replacement period"
have not occurred with
the timing belt <2>.
4) Confirm that the belt tension is adjusted to slacken as shown in
.
■ Adjusting the J3 axis timing belt
1) Carry out steps 1) and 2) indicated in
" ■ Inspecting the J3 axis timing belt"
above.
2) Lightly loosen the two motor plate installation screws <1>. (Do not loosen too much.)
3) The nut which is fixing tension adjustment screw <3> is loosened, turn tension adjustment screw <3>, and
adjust the tension of timing belt <2>.
When the screw is turned to the right, the belt will be stretched, and when turned to the left, will loosen.
Adjust the belt tension slack to within the range as shown in
If the belt is loosened too much when adjusting the tension causing it to come off the timing pulleys <4> and
<5>, or if the belt and pulley teeth engagement is deviated, the machine system's origin will deviate.
4) After adjustment fastens the fixing nut of tension adjustment screw <3>, and certainly fixes tension
adjustment screw <3>. Moreover, also fasten motor plate installation screws <1> certainly. (two pc.) Improper
tightening can cause the belt to loosen with vibration.
■ Replacing the J3 axis timing belt
If the timing belt of the J3 axis is removed, the forearm will drop by the self-weight.
And, if the positional relation between the timing pulley (4) and (5) deviated, it will
become the cause of the position deviation. For the safety before replacing the timing
belts, hit the J3 axis against mechanical stopper with releasing brake.
1) Carry out steps "1)" and "2)" indicated in
" ■ Inspecting the J3 axis timing belt"
above.
2) Make sure that the pulleys do not move while replacing the belt. If the timing pulley <4> and <5> position
relation deviates, the position could deviate.
<3>Tension adjustment screw
With the fixing nut
<5> Timing pulley
(joint side)
<4> Timing pulley
(motor side)
Mark
<1> Motor plate installation screws
<2> Timing belt
CAUTION