Table of Contents
Advertisement
4.16 END STOP MECHANISM
The purpose of the automatic end stop mechanism
is to switch off the motor at the end of the tape, or
in case of tape break. The end stop feeler 242503
is located on upper mounting plate and extends
through the cross-shaped hole in right hand guide
post 243013. The feeler operates microswitch 202151
via lever 244342A, and rests with a light spring ten-
sion against the tape when the operating lever is in
normal forward drive, and winding positions.
4.16.1 Neutral
Figure 4.35 shows the position of the relevant parts
when the operating lever is in neutral (stop). Arm
244694A has a flap extending through the upper
mounting plate, and is held in an intermediate posi-
tion by the operating lever. The arm attacks the tape
feeler at point A and keeps the feeler clear of the
guide post. Arm. 244694A excerts pressure on lever
244342A, and the microswitch is depressed to its off
position.
4.16.2 Normal Forward Drive
Fig. 4.36 shows the situation when the operating
lever is set to normal forward drive, forward or re-
verse winding, with a tape properly inserted in the
tape path. Arm 244694A is now moved by the operat-
ing lever in the direction of the arrow, and the pres-
sure against the tape feeler at point A ceases. Simul-
taneously the pressure at point B ceases, because
the arm 244694A, which rests in a groove of the lever
244342A, is released. The microswith returns to the
closed position and the motor starts. The tape feeler
rests gently against the tape, due to the tension of
the spring 243990.
4.16.3 End Stop or Tape Break
Fig. 4.37 shows the situation when the tape has run
out, or in case of tape break.
The spring 243990 pulls the delrin part of the feeler
fully in and the feeler activates the microswith so as
to switch off the motor.
4.16.4 Free
Fig. 4.38 shows the position of the relevant parts
when the operating lever is in position FREE. The
arm 244694 A is moved in a direction away from the
normal forward drive position. The tape feeler is
locked in open position at point D, and the tape can
be inserted.The lever 244342 A is locked in position E,
holding the microswitch depressed (motor switched
off).
4.16.5 Tape Feeler Tension
The feeler tension against the tape should be be-
tween 8 and 10 gr. (0.28-0.35 oz) in drive and wind-
ing modes. Adjustment of the tension is accomp-
lished by tightening or slackening the spring 243990.
Adjustment of Tape Feeler Movement
For the adjustment of the tape feeler movement refer
to fig. 4.39. Set the operating lever in normal forward
drive position, or forward or reverse winding. The
mains switch is set to ON. No tape should be insert-
ed. The tape feeler will therefore rest in the position
where the motor is switched off.
Push the feeler slowly in direction of the tape path.
When the contact surface (polished) of the feeler is
0.5-1.0 mm (20-40 mil) from the contact surface of
the guide post, the microswitch should close and
start the motor. If not, loosen screw F, and move the
microswitch slowly until the motor starts when the
tape feeler is in the position specified above. Then
tighten the screw. When the tape feeler is released,
the microswitch should open, and stop the motor
when the spacing between tape feeler and the arm
244694 A is maximum 1.5 mm (60 mil). See fig. 4.37.
990222 990312 203013 240276A 244694A 242309
202151 M360 244342A 243990 242503 243013
Fig. 4.35 Neutral.
22
Hide quick links:
Advertisement
Table of Contents
