JUKI AMS-221EN Series Engineer's Manual page 51

Adjustment Procedures
1. Move the X moving base to the rear side (in the direction of the arrow A).
2. Tighten the adjusting screw
310N. (Refer to the description below in regard to tension gauge setup
and measurements.)
3. Tighten the setscrews
or three times roundtrip for settlement. Check the belt tension again.
When tightening the setscrews
the Y trailing bracket
and backward, the timing belt
of the sprocket .)
How to measure the belt tension
Use the acoustic belt tension meter U-507 (by Unitter).
Enter the setup data in the belt tension meter.
2516 1) MASS: 0.033kg/m, 2) WIDTH: 25mm, 3) SPAN: 190mm
3020 1) MASS: 0.033kg/m, 2) WIDTH: 25mm, 3) SPAN: 230mm
Install a microphone in the center of the belt core. (Distance between
the microphone and the belt: Approx.
Press the MEASURE button to set up the measuring mode. Tap the
vicinity of the microphone by means of the tip of a tool that does not hurt
the finger or the belt.
A measured value is indicated.
(For more detailed use of the tension meter, refer to the relevant manual
of the tension meter.)
If the belt tension meter is not available at your hand:
If no belt tension meter is available at your hand, the procedure below
can substitute for the confirmation of tension according to the above
procedure 2. In such a case, however, variations in the setup tension
may become greater due to the operating circumstances (temperature,
humidity) and/or whether the belt is new or a reused one.
Belt tension should be checked with the use of a belt tension meter so
long as circumstances permit.
(Alternative procedure)
2. When the center part of the timing belt
with a spring balance, tighten and fix the adjusting screw
the loaded point makes a warp of 2mm.
so that the belt tension attains 290 to
(4 pcs.) and move the X moving base two
, pay attention to the inclination of
. (When the X moving base is moved to forward
shall stand steadily around the center
is loaded at 9.8N (1000g)
o If the tension is excessive, it will
o If the tension is too low, it will
o If the Y trailing bracket
so that
– 47 –
Results of Improper Adjustment
cause timing belt
cause failure of the feed.
the edge of the timing belt
come in contact with the Y trailing
bracket , thus leading to de-
struction.
breakage.
is tilted,
may