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61. Machine motor
If the foot control has already been operated, the operator will be requested to release it again.
The speed indicator consists of a forked light barrier, which scans a toothed wheel located on the motor
shaft.
The flanks of this signal are measured as a function of time and counted.
The actual speed and the target speed are displayed in the form of numbers.
The „NEEDLE RAISED“ stop position is set.
The operator is requested to press the foot control right down.
The machine slowly increases the target speed (the speed values are displayed), up to the max. speed.
The machine then halts in the top position.
An evaluation window (OK or Error) is displayed after completion of the test.
The current test can be interrupted with the „i“ button.
Press now the push-button „Continue“.
Needle stop down
The needle stop positions are combinations of the values from the synchronizer and the speed indicator.
The operator is requested to press the foot control.
The sewing machine slowly performs one revolution and halts in the lower position.
An evaluation window (OK or Error) is displayed after completion of the test.
The current test can be interrupted with the „i“ button.
Press now the push-button „Continue“.
62. Bobbin thread monitor
The bobbin thread is monitored by a light barrier.
The light only passes though a bobbin when it is almost empty; this generates a signal.
The barrier light is pulsed, because of the great amount of energy required.
The pulse is derived from the speed indicator signal and is approx. 50 usec long.
The synchronous scanning of the light barrier receiver is performed by the hardware.
The operator is requested to fit a full bobbin case, to close the free-arm cover and to press the foot control.
The sewing machine performs one revolution; no bobbin thread signal should be given.
The operator is requested to release the foot control again, to fit an empty bobbin case, to close the free-
arm cover.
Press now the push-button „Continue“.
Press the foot control.
The sewing machine performs one revolution, and then halts.
The operator is requested to release the foot control.
If now a bobbin thread signal is not given, an error message will be issued.
An evaluation window (OK or Error) is displayed after completion of the test.
The current test can be interrupted with the „i“ button.
Press now the push-button „Continue“.
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