Inspection, Maintenance And Replacement Of J1-Axis Timing Belt (Rv-4F/7F Series Only) - Mitsubishi Electric RV-4FM-SE Series Instruction Manual

5 Maintenance and Inspection

(2) Inspection, maintenance and replacement of J1-axis timing belt (RV-4F/7F series only)

The reference figure at inspection, adjustment, and replacement of the timing belt is shown in
Inside of J1 motor cover
Fig.5-6 ： Inspection, maintenance and replacement of J1 axis timing belt
■ Inspecting the J1 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to Page 82, "5.3.2 Installing/removing the
3) Visually confirm that the symptoms indicated in
the timing belt.
4) Adjust the belt with reference to following
■ Adjusting the J1 axis timing belt
1) Carry out steps "1)" and "2)" indicated in
2) Lightly loosen the motor plate fixing screw <1>.(two pc.) (Do not loosen too much.)
3) Loosen the nut fixing tension adjustment screw <3>. And lightly loosen tension adjustment screw <3>.
4) In the condition that hook <6> of the motor plate is pulled by the force shown below, fix the motor plate fixing
screws <1> tight. (two pc.)
Force which pulls the hook <6>:
RV-4F series...................used belt: 53-65N, new belt: 80-98N
RV-7F series...................used belt: 82-100N, new belt: 123-151N
The tension of J1 axis timing belt is adjusted with this method. Certainly fix two motor plate fixing screws <1>.
Improper tightening can cause the belt to loosen with vibration.
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.
5) After adjustment, fixes the fixing nut and certainly fix tension adjustment screw <3>.
■ Replacing the J1 axis timing belt
Note) Make sure that the pulleys do not move while replacing the belt. If the pulley <4> and <5> position relation
deviates, the position could deviate.
1) Loosen the nut of the tension adjustment screw <3>, and loosen the tension adjustment screw <3>.
2) Remove the motor plate fixing screw <1>, and remove the timing belt <2> from the timing pulley (this side) <4>.
3) Remove the J1 axis motor, and remove the timing belt <2>.
4) Install the new timing belt to the timing pulley (back) <5> and timing pulley (this side) <4>, and install the J1
axis motor to the original position by motor plate fixing screw <1>.
5) Refer to " ■ Adjusting the J1 axis timing belt"
6) The position could deviate after the belt is replaced. Confirm that the position has not deviated. If deviated,
refer to Page 104, "5.6 Resetting the
Maintenance and inspection procedures
5-86
<3> Tension adjustment screw
With the fixing nut
<6>Motor plate hook
Pulls and fixing
cover", and remove the J1 motor cover.
"(1)Timing belt replacement period"
" ■ Adjusting the J1 axis timing
" ■ Inspecting the J1 axis timing belt"
and "(8)Timing belt tension"
origin", and reset the origin position.
<1>Motor plate fixing screw
<4>Timing pulley (near side)
<5>Timing pulley (back)
<2>Timing belt
have not occurred with
belt".
above.
to adjust the tension.
Fig. 5-6.