Maintenance and inspection procedures 5-78
(2) Inspecting/Adjusting the J3 axis timing belt
The section related to J3 axis timing belt and adjustment is shown in
. The picture is the image which
removed the No.2 arm cover.
Fig.5-10 ： Inspecting/Adjusting the J3 axis timing belt
Inspection and adjustment procedure of the timing belt of J3 axis are shown below.
1) Confirm that the power supply of the controller is OFF.
2) Refer to
Page 72 "Fig. 5-3: Installing/removing the cover"
, and remove the No.2 arm cover U.
3) Visually confirm that the symptoms indicated in
"(1)Timing belt replacement period"
have not occurred with
the <4> timing belt.
4) Lightly press the center of the belt, and confirm that the value of belt slack is in
. Or measure the tension of the belt with tension meters, and confirm that the value is in the range
of standard tension shown in
Page 85 "Fig. 5-12: Belt tension"
When adjustment is necessary, continue to follow the procedure shown below.
When adjustment is not necessary, install the No.2 arm cover U as before and finish the inspection.
5) Lightly loosen J3 axis motor installation screws <2> (Be careful not to overly loosen the screws.).
6) The nut which is fixing tension adjustment screw <1> is loosened, turn tension adjustment screw <1>, and
adjust the tension of timing belt <4>.
When the screw is turned to the right, the belt will be stretched, and when turned to the left, will loosen.
Adjust tension to the above-mentioned value.
Note) Be careful, if the belt is removed from pulley <5> <6>, or the mesh of belt and pulley <5> <6> is
shifted by loosening the screw too much, the origin will deviate. If the position deviated, reset the
origin. (Refer to
Page 93, "5.6 Resetting the origin"
7) After adjustment, fasten securely the three J3 axis motor fixing screws <2>, and the nut of tension
adjustment screw <1>. Improper tightening may cause the belt to loosen with vibration.
8) Install No.2 arm cover U securely as before and finish adjustment.
This completes adjustment of the J3 axis timing belt.
<3> J3 axis motor
<6> Timing pulley B
Don't remove the timing
belt.
<4> Timing belt
Push
<5> Timing pulley A
Don't remove the timing
belt.
<1>Tension
adjustment screw
Loosen the
nut, adjust by
screw
J3 axis motor
Top view
<2> The J3 motor fixing screws are in
three places.
<2> J3 axis motor
fixing screw
Loosen lightly
<2> J3 axis motor fixing screw
Loosen lightly
