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(5) Inspection, maintenance and replacement of J4-axis timing belt
The reference figure at inspection, adjustment, and replacement of the timing belt is shown in
J3 axis
<5> Timing pulley
(joint side)
Fig.5-8 ： Inspection, maintenance and replacement of J4 axis timing belt
■ Inspecting the J4 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to
Page 49, "5.3.2 Installing/removing the
3) Visually confirm that the symptoms indicated in
the timing belt.
4) Confirm that the belt tension is adjusted to slacken approx. 0.8mm when the center of the belt is lightly
pressed with a finger (approx. 1.3N) as shown in
■ Adjusting the J4 axis timing belt
1) Carry out steps 1) and 2) indicated in
2) Lightly loosen the two
3) The nut which is fixing tension adjustment screw <3> is loosened, turn the 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.
Confirm that the belt tension is adjusted to slacken approx. 0.8mm when the center of the belt is lightly
pressed with a finger (approx. 1.3N).
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
can cause the belt to loosen with vibration.
■ Replacing the J4 axis timing belt
1) Carry out steps 1) and 2) indicated in
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) Make marks on the timing belt <2> and timing pulleys <4> and <5> with a felt-tip pen as shown in
that the engagement of the timing belt <2> and timing pulleys <4> and <5> does not deviate.
4) Lightly loosen the two
5) Loosen the nut fixing tension adjustment screw <3>. Loosen the tension adjustment screw <3>, and remove
the old belt.
6) Copy the marks onto the new timing belt. Make sure that both belts are tense when making the marks.
7) Align the new timing belt with the marks on the timing pulleys <4> and <5>, and install.
8) Refer to
" ■ Adjusting the J4 axis timing belt"
9) The position could deviate after the belt is replaced. Confirm that the position has not deviated. If deviated,
refer to
Page 70, "5.6 Resetting the
Mark
<1>Motor plate fixing screw
" ■ Inspecting the J4 axis timing belt"
<1>. (Do not loosen too much.)
motor plate fixing screws
motor plate fixing screw
" ■ Inspecting the J4 axis timing belt"
<1>. (Do not loosen too much.)
motor plate fixing screws
origin", and reset the origin position.
<1>Motor plate fixing screw
<2> Timing belt
cover", and remove the elbow cover B and Relbow cover.
"(1)Timing belt replacement period"
"Fig.5-13 ： Belt
tension".
<1> certainly. (two pc.) Improper tightening
and
"(8)Timing belt tension"
Maintenance and inspection procedures 5-56
5 Maintenance and Inspection
Fig.
5-8.
<3>Tension adjustment screw
With the fixing nut
Mark
<4> Timing pulley
(motor side)
have not occurred with
above.
above.
Fig. 5-8
to adjust the tension.
so
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