Industrial Sewing Machine SADE
32
Top thread tension regulator and Top thread tension monitor
The thread tension regulators are similar to the standard LU-2810 machine, but are
locked away to prevent unauthorized adjustments as shown on figure 5.
The thread monitor device will measure absolute tension values and evaluate the
measurements by pre-set tolerances. The unit consists of a measurement head and an
amplifier. JUKI SADE offers the thread tension sensor being from the company BTSR.
The connection between the two is done by JUKI and there is an option (not included in
the base system) for doing the re-calibration.
1 – top thread tension regulator
2 – top thread tension monitor
Fig. 5. Top thread tension regulator
Bobbin thread monitor
An optical sensor monitors the remaining bobbin thread. The sensor head is mounted
near the hook and electrically connected an electronic controller mounted next to the
main switch. The signal of this unit is processed by the JUKI SADE to prevent the oper-
ator from starting a product cycle with a bobbin running on spare thread.
Once the sensor goes on the sewing operation is temporarily stopped. An alarm and
LED light indicate the threads about to be finished. By pressing the green button on the
front in the head of the machine the operator can continue the sewing until the heal
back function is used. Then the operator has to change the bobbin and confirm the
change by scanning the bobbin.
Fig. 6. Bobbin thread monitor
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