edge of the escapement rack. The carrier has two shoes, an upper carrier shoe and a lower carrier shoe. The lower shoe is a small block fastened to a plate and mounted on the carrier. The upper carrier shoe is mounted by an eccentric stud.
(Figure 4-33)
Figure 4-33.
A load spring is used on the new style support and maintains a constant pressure on the upper carrier shoe and removed the play between the lower shoe and the bottom of the escapement rack.
This eliminates any vertical play at the rear of the carrier during a print operation. (Figure 4-34)
Carrier
Carrier Shoes
Figure 4-34.
The rocker assembly pivots about the rocker shaft at the rear of the carrier. At the proper time in the cycle, the print cam, also located on the print sleeve, drives the rocker about its pivot point, causing the type head to strike the paper.
(Figure 4-35)
The fine alignment mechanism .is located within the carrier assembly. There is a separate detent for both tilt and rotate. The tilt detent directly controls the rotate detent. If the tilt detent fails to seat in the detent notch, the rotate detent can-not seat in its can-notch. Both detents are spring
loaded into engagement. When detenting occurs, the tilt detent will be spring loaded into a notch in the tilt ring. When the tilt detent enters a tilt ring notch, the rotate detent will be allowed to enter a notch in the skirt of the typehead. These detents are power driven out of engagement. (Figure 4-36)
Operates Here
Figure 4-35.
Tilt Ring
Tilt Detent
Figure 4-36.
The detents are control led by the detent cam through the detent cam follower and detent actu-ating lever. The spring load of the detents causes the detent cam fol lower to ride the surface of the detent cam. As the detent cam follower enters the low dwell of the detent cam, the detent actuating lever will allow the tilt detent to enter a notch in the tilt ring and the rotate detent to enter a notch in the typehead. As the print sleeve continues to rotate, the high dwell of the detent cam is encoun-tered. The cam follower and the detent actuating
4-13
Section IV HCS-220003 lever will be driven to the left to remove the detents
from the notches. This permits the selection mechanism to return the typehead to rest.
(Figure 4-37)
'1 ocker Shaft
NOTE:
Tilt Detent Spring
Yoke
Tilt Ring
Print Sleeve Ribbon Feed And Detent Cam
Figure 4-37.
Vertical and horizontal alignment must be properly defined before any adjustments are attempted.
VERTICAL alignment problems exist when the letters are out of position this way.
An example follows:
anbncndnenfngnhninjnknlnmnnnOnPnqnrnsntn unvnwnxnynzn
ANBNCNDNFNGNINJNKNLNMNNNONPNQN RNSNTNUNVNWNXNYNZN
HORIZONTAL alignment problems exist when the letters are out of position this way.
An example follows:
anbncndnenfngrhirj nk
nlnmn
nnopiqnrnsntnunvnwmcnynz
ANS NCND N ENF NGNHN INJN K NLNMf\ONP N ONA'J QRN SNTN U'JV N\l\NXY f\IZ
4-7. CHARACTER SELECTION a. Tilt
The purpose of the tilt mechanism is to select the desired horizontal character band so that a character in that band may be brought to the printing point. The type-head clips to the upper ball socket. The upper ball socket mounts in a platform-like part called the tilt ring. The tilt ring pivots on two pivot pins between the yoke arms, inside the hollow part of the type-head. The yoke assembly is fastened to the rocker assembly. (Figure 4-38)
The tilt ring is located in about the center of the typehead and causes the typehead to tilt as the tilt ring pivots about its pivot pins. The typehead rests with the upper band of characters in the print position and al! tilt positions are upward from the rest position.
The tilt pulley is mounted on an angle on the rocker and is connected to the tilt ring by a link. A pull on the tape causes the tilt pulley to rotate about its mountrng stud and trans-fers motion to the tilt ring. When the pull on the tape is relaxed, the tilt pulley is restored to rest by an extension spring. The tilt pulley link is fastened to the tilt pulley by a ball shouldered rivet to allow the link to pivot in all directions.
The left hand tilt pulley is mounted to the tilt arm on a ball shouldered pivot screw.
This allows the pulley to remain horizontal regardless of the position of the tilt arm. It must remain horizontal to prevent the tape from coming off the pulley.
HCS-220003
Left Hand Tilt Pulley
Tilt- 1 Latch
I " ,
,,
,'I , '<~ , ,,.J
) , ,
Tilt Pulley Spririg
Figure 4-38.
The typehead is positioned throughout four tilt band positions by two latches.
(Figure 4-39) Tilt band 0 does not use either latch. Tilt band 1 requires the T1 latch to remain under the bail and causes the tilt arm to move one band of movement.
(Figure 4-40) To select the tilt 2 band, the T2 latch remains under the bail and the T1 latch is removed, thus causing the tilt arm to move two bands of movement. The fourth band of the typehead or the tilt 3 position, requires both tilt latches remain under the bail to give three bands of motion to the tilt arm.
If you have a vertical alignment failure, first remove the typehead from your machine. Check the detenting on the "Z"
and
"J".
Make sure the ti It ring is detenti ng properly when the play is removed in the negative direction. Also, make sure you check the detenting by removing the play in the positive direction. This will tell you if the 'titt ring play' is correct and, moreTilt Pulley
Tilt Arm
Tilt-2 Latch
Section IV
Right Hand Tilt Pulley
Tilt Bellcrank
r .
Positive Latch Bail
Figure 4-39.
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