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5 Maintenance and Inspection
(3) Inspection and maintenance of J2 axis timing belt
The reference figure at inspection and adjustment of the timing belt is shown in
<4> Timing pulley
Upper face of No.1 arm
<1> Idler fixing screw
(two places)
<3>Tension adjustment screw
With the fixing nut
Fig.5-5 ： Inspection, maintenance and cleaning of J2 axis timing belt
■ Inspecting the J2 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to
Page 73, "5.3.2 Installing/removing the
3) Visually confirm that the symptoms indicated in
the timing belt <2>.
4) Check the belt tension as shown in
confirm that the value of belt slack is in following.
Force to press the belt: apprpx.4N ･ m, Flexure: approx.1.6mm
■ Adjusting the J2 axis timing belt
1) Carry out steps "1)" and "2)" indicated in
2) Lightly loosen the two idler installation bolts <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.
Lightly press the center of the belt <A>, and confirm that the value of belt slack is in following.
Force to press the belt: apprpx.4N ･ m, Flexure: approx.1.6mm
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 idler fixing screw <1> certainly. (two pc.) Improper tightening can
cause the belt to loosen with vibration.
Maintenance and inspection procedures
5-77
<5> Timing pulley
Idler
No.1 arm cover B side
Note) The figure shows the timing belt structure section in the No.1 arm portion.
Remove and confirm both No.1 arm cover B.
cover", and remove the No.1 arm cover B.
"(1)Timing belt replacement period"
"Fig.5-8 ： Belt tension"
" ■ Inspecting the J2 axis timing belt"
Inside of the No.1 arm
<A>
<2> Timing belt
. Lightly press the center of the belt <A>, and
Fig.
5-5.
have not occurred with
above.
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