Inspection, Maintenance And Replacement Of J3-Axis Timing Belt - Mitsubishi Electric MELFA RH-6SQH Series Instruction Manual

5Maintenance and Inspection

(2) Inspection, maintenance and replacement of J3-axis timing belt

(1)J3 motor inatallation screw
（Bottom of the J3 motor)
Fig.5-4 ： Inspection, maintenance and replacement of J3-axis timing belt
■ Inspecting the J3 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to Fig.
3) Visually confirm that the symptoms indicated in
the timing belt.
4) Check the belt tension as shown in
and confirm that the value of belt slack is in following.
RH-6SQH series: Force to press the belt: apprpx. 2N /Flexure: approx. 2.5mm
RH-12SQH/18SQH: series.. Force to press the belt: apprpx. 4N / Flexure: approx. 3.7mm
■ Adjusting the J3 axis timing belt
1) Carry out steps 1) and 2) indicated in
2) Lightly loosen J3 motor installation screws (1) (Be careful not to overly loosen the screws.).
3) While checking the tension of the timing belt (2), move the J3 motor (3) in the directions of the arrows indi -
cated in the figure above. Lightly press the center of the belt, and confirm that the value of belt slack is in
following.
RH-6SQH series: Force to press the belt : approx. 2N / Flexure: 2.5mm
RH-12SQH/18SQH series: Force to press the belt: approx. 4N / Flexure: 3.7mm
4) The belt tension will increase when moved in the direction of arrow a, and will decrease when moved in the
direction of arrow b.
5) 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.
6) After adjusting, securely tighten the J3 motor installation screws (1). Improper tightening can cause the belt
to loosen with vibration.
Maintenance and inspection procedures
5-63
a
(3)J3 motor
(4)Timing pulley
5-3, and remove the No.2 arm cover-U.
"(4)Timing belt tension" on page
b
(2)Timing belt
(5)Timing pulley
（Bottom of the shaft）
"(1)Timing belt replacement period"
" ■ Inspecting the J3 axis timing belt"
(7)Shaft
(6)Shaft inatallation screw
(7)Shaft
(2)Timing belt
have not occurred with
67. Lightly press the center of the belt,
above.