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5Maintenance and Inspection
(4) Inspection and maintenance of J3 axis timing belt
The reference figure at inspection and adjustment of the timing belt is shown in
<6> The hole for belt maintenance
(Push the belt)
Upper face of No.2
Arm
cover
A(3) side
<4> Timing
pulley
<3>Tension adjustment screw
With the fixing nut
Motor cover J3 section
Note) The figure shows the timing belt structure section inside the No.2 arm.
Remove and confirm the motor cover J3 and the arm cover A(3).
The belt can be pushed and adjusted from hole for belt maintenance <6>.
The idler fixing section and the tension adjustment screw section are in the No.2 arm.
Fig.5-6 ： Inspection, maintenance and cleaning of J3 axis timing belt
■ Inspecting the J3 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to
Page 65, "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.
RH-3SQHR3515 : Force to press the belt: apprpx.3N ･ m, Flexure: approx.1.2mm
■ Adjusting the J3 axis timing belt
1) Carry out steps
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.
RH-3SQHR3515 : Force to press the belt: apprpx.3N ･ m, Flexure: approx.1.2mm
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
5-70
<A>
"Fig.5-8 ： Belt tension"
"1)"
and
"2)"
indicated in
<2> Timing belt
Idler
<1> Idler fixing screw
(two places)
cover", and remove the motor cover J3 and arm cover A(3).
"(1)Timing belt replacement period"
. Lightly press the center of the belt <A>, and
" ■ Inspecting the J3 axis timing belt"
Fig.
5-6.
No.2 arm
<5> Timing pulley
have not occurred with
above.
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