Bell 28E Adjustments Download Page 47

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3.14

Start-Stop Pulse Contact

ISS

SECTION

573-127-703

(A) CONTACT LEVER

To Check

Remove contact assembly from unit.

Insure that no clearance exists be
tween the contact lever and insulator.

Requirement

grams---Max

grams

to move insulator from contact
operating lever.

To Adjust

Bend lower contact spring.

UPPER CONTACT SPRING

LOWER CONTACT SPRING

(B) CONTACT GAP (START AND STOP

Requirement

Min

0.012

inch---Max

0.018

inch

(Front Views)

CONTACT OPERATING LEVER

To Adjust

Bend upper contact spring.

To Check

Place unit in stop position. Latch
clutch. Check clearance between

contact operating lever and transfer

lever.

Requirement

0.012

inch---Max

0.018

inch

To Adjust

Loosen mounting bracket screws.

Position contact assembly to meet

requirement.  Retighten  mounting
bracket  screws.  Replace  contact
assembly  in  unit.

Page

4--·-

Summary of Contents for 28E

Page 1: ...arm 18 Tight tape intermediate arm spring 18 Tight tape start stop contact spring 16 CONTENTS PAGE Tape Lid Start stop detent bail spring Tape guide Tape guideplate Tape lid Tape lid release plunger...

Page 2: ...ism Start stop contact gap for tabulator control Timing bail spring EARLY MODELS Tape Lid Mechanism Tape lid Tape lid release plunger spring for units without tape lid spring GENERAL 52 52 55 55 56 1...

Page 3: ...her unplated or gold plated tungsten If in doubt as to the type of contacts remove contact box cover and inspect contacts for gold ISS 5 SECTION 573 127 703 plating Do not use burnishers files etc whi...

Page 4: ...eck Invert unit and rotate main shaft until clutch shoe lever and stop lug are up With clutch engaged hold cam disc to prevent turning Requirement r Min 15 oz Max 20 oz Page 4 CLUTCH DRUM CAM STOP LUG...

Page 5: ...between clutch shoe lever and stop lug Disengage the clutch and again pull the lever opposite the stop lug with a force of 32 oz Release the force slowly Note clearance between the shoe lever and the...

Page 6: ...il play taken up to make clearance minimum C CLUTCH LATCHLEVER SPRING To Check Trip clutch and rotate until latchlever is on low part of disc Requirement Min 3 oz Max 5 1 2 oz to start clutch latchlev...

Page 7: ...N 573 127 703 To Adjust Loosen bearing bracket mounting screws While pressing tape lid against tape guideplate position bear ing bracket Recheck Requirement 1 Note 2 If Requirement 2 cannot be met pos...

Page 8: ...guideplate 3 Requirement Tape must not ride up the sides of the tape guides To Adjust Loosen mounting nuts Position wear plate until it overhangs tape guide plate Push gauge down until top two studs...

Page 9: ...te in horizontal position Requirement Min 2 1 2 oz Max 4 1 2 oz to move open end of tape lid against tape guideplate to start detent bail moving away from control lever B TAPE LID RELEASE PLUNGER SPRI...

Page 10: ...es by equal amounts as gauged by eye Loosen clamp nut and rotate feed wheel post To Adjust 2 Requirement Tape guideplate to rest firmly against a minimum of three of the four projec tions on side plat...

Page 11: ...ow FRONT PLATE 2 Requirement Feed wheel slot to align with slot in tape guideplate so that feed wheel ro tates freely with control lever in free position To Adjust Position top plate toward one side p...

Page 12: ...ction tight move clampscrews to their extreme lower right position then tighten screws Loosen detent bracket and spring plate mounting nuts Place cover on unit and position horizontally to meet re qui...

Page 13: ...bracket shoulder bushing on upper hole and the washer on lower mounting hole Rehook tape out pin spring B TAPE OUT SENSING PIN SPRING To Check Place control lever in run position Requirement NORMALLY...

Page 14: ...T SENSING PIN 1 To Check Place control lever in stop position Requirement Top of pin to be Min flush Max 0 010 inch below surface of tape guideplate To Adjust Loosen stop arm clampscrew friction tight...

Page 15: ...heck Hold tape out pin manually against stop arm Requirement Top of pin to be Min flush Max 0 010 inch below top surface of guideplate To Adjust Loosen switch bracket mounting screws Position switch b...

Page 16: ...y engage insulated portion of start stop switch swinger To Adjust Loosen mounting screws and position start stop switch swinger to meet requirement Retighten mounting screw B TIGHT TAPESTART STOP CONT...

Page 17: ...e arm clampscrew Position pry point midway in contact operating arm adjusting slot Retighten clampscrew b Loosen switch bracket screws friction tight Position contact pile up to meet requirement 2 Req...

Page 18: ...0 045 inch b Open as bail is raised to 0 075 inch To Adjust Loosen clampscrew and position tight tape intermediate arm using pry points Retighten clampscrew TIGHT TAPE BAIL PRY POINT B TIGHT TAPE INT...

Page 19: ...in and top surface of tape guideplate should be flush to 0 005 inch below To Adjust With clutch disengaged loosen front and rear transfer lever guide eccentric post locknuts Position highest point of...

Page 20: ...in some Max 0 015 inch To Adjust Position main bail eccentric screw with nut on eccentric screw loosened and high part of eccentric screw to the right Tighten nut Check and refine if necessary MAIN BA...

Page 21: ...ratchet detent eccentric toward the right With an all marking code combination punched into a new piece of tape place the tape on the feed wheel and over the sensing pins Take up play in tape lightly...

Page 22: ...tooth just engaged To Adjust Loosen feed pawl eccentric locknut and position feed pawl eccentric Re check requirement at four positions on feed wheel ratchet approximately 90 degrees apart FEED WHEEL...

Page 23: ...SFER LEVER SPRING To Check Disengage unit clutch Requirement Min 1 2 oz Max 1 1 2 oz TRANSFER LEVER SPRING to start each transfer lever spring moving LOCKING BAIL Front View Rear View B LOCKING BAIL S...

Page 24: ...fer bail extension and spacing latch Requirement Clearance in marking and spacing positions should be equal within 0 002 inch J To Adjust Loosen stabilizer assembly mounting screws friction tight and...

Page 25: ...TRIP OF TP107162 TWILL JEAN BETWEEN THEM B DRIVE LINK SPRING To Check Trip clutch and rotate main shaft to stop position Unhook stabilizer spring and move latches away from transfer bail extension Hol...

Page 26: ...magnet assembly from unit Loosen two screws on bottom of magnet assembly and position mounting hinge until required condition is obtained Tighten screws 2 Requirement With high part of eccentric towa...

Page 27: ...tight move bracket to its lowermost position then position bracket by means of adjusting lug on bracket visible through hole in rear plate Tighten screws Refine requirements if necessary Note The abov...

Page 28: ...on bracket visible through hole in rear plate Tighten screws Refine requirement if necessary MAIN BAIL LATCH SPRING MAIN BAIL LATCH SPRING Requirement With unit inverted and main bail latch released M...

Page 29: ...of the transmitter distributor unit under test will interrupt the current to the stroboscopic lamp within the DXD Have the transmitter distributor transmitting Y or R continu ously and the test set an...

Page 30: ...NOMINAL 36 STOP TO 142 STOP 142 STOP TO 6 ONE 6 ONE TO 12 TWO 12 TWO TO 18 THREE 18 THREE TO 24 FOUR 24 FOUR TO 30 FIVE 30 FIVE TO 36 STOP 1 DIV MARKING TOLERANCE BEGIN 5 DIV END 1 2 DIV BEGIN t 5 DI...

Page 31: ...0 FIVE TO 0 STOP 1 DIV II Ii iI MARKING TOLERANCE NOMINAL BEGIN 5 DIV 0 STOP TO END 1 2 DIV 0 START BEGIN 5 DIV 0 START TO END 5 DIV 0 ONE BEGIN 5 DIV 0 ONE TO END 5 DIV 0 TWO BEGIN 5 DIV 0 TWO TO EN...

Page 32: ...VEL UNITS 8 50 UNIT CODE MARKING TOLERANCE NOMINAL BEGIN 7 DIV 0 STOP TO END 1 2 DIV 0 START BEGIN 7 DIV 0 START TO END 7 DIV 0 ONE BEGIN 7 DIV 0 ONE TO END 7 DIV 0 TWO BEGIN 7 DIV 0 TWO TO END 7 DIV...

Page 33: ...tible amount of backlash between the intermediate driving gear and the transmitter distributor gear To Adjust Loosen three mounting screws that se cure the transmitter distributor unit to its base Pos...

Page 34: ...tion tight tape intermediate arm to meet this requirement Re tighten clampscrew Rear View POINTS ARM CLAMPSCREW TIGHT TAPE SWITCH CONTACTS B TORSION SPRING Requirement Min 2 1 2 oz to lift tape shoe C...

Page 35: ...ition bracket to meet requirement Retighten bracket mount ing screws Refine adjustment if necessary by rotating the detent lever adjusting screw Note If tape is not available use TP165800 gauge B TAPE...

Page 36: ...sed lower contacts B TAPE OUT BAIL TORSION SPRING Requirement Min 8 oz Max 12 oz to separate bail from tape out pin To Adjust Bend contact swinger Recheck requirement under 1 To Check above 3 To Check...

Page 37: ...M TAPE OUT PIN SPRING ISS 5 SECTION 573 127 703 D TAPE OUT PIN To Check Place control lever in free or stop position Check position of tape outpin in relation to tape g uideplate Requirement Tape out...

Page 38: ...Bend lower leaf 2 Requirement Min 30 grams Max 40 grams to open normally closed contacts To Adjust Bend swinger Note 3 If it is necessary to bend backstop to obtain required tension reposition backst...

Page 39: ...to be aligned with its sensing arm To Adjust Loosen screws which mount the contact assembly to the contact bracket Position the assembly to meet the re quirement B CONTACT SWINGER SENSING ARM CLEARANC...

Page 40: ...K combination Requirement Sensing arms must engage a minimum of 2 3 of their respective transfer levers To Adjust Add TP8896 shims between plate as sembly and the split bail spacer to meet requirement...

Page 41: ...Table 2 Requirement Breaks in the pulses must be confined to the first and last 10 divisions of the trace CONTACT OPERATING REQUIREMENTS TABLE Beginning Pulse Levels Unit Code Scale Scale Tolerance S...

Page 42: ...equirement Min 5 1 2 oz Max 6 oz to move normally open contact away from stiffener To Adjust Bend normally open contact leaf to meet requirement 2 Requirement Min 0 015 inch Max 0 020 inch gapbetween...

Page 43: ...and contact springs Retighten contact assembly screws CONTACT ASSEMBLY SCREWS MOUNTING SCREWS AUXILIARY CONTACT BRACKET Front View ISS 5 SECTION 573 127 703 2 To Check Check position of swinger with...

Page 44: ...ion is continuous Use normal direct current line signal of 60 rna 10 or 20 rna 10 to strobe the contacts Requirement The contacts must open and close within the range specified in the Contact Operatin...

Page 45: ...t swinger pad WEAR PLATE TAPE GUIDE PLATE TAPE OUT SWITCH B SWITCH LEVER To Check Open tape lid Depress the tape out sensing pin Requirement L Min 0 005 inch Max 0 015 inch between the normally closed...

Page 46: ...t Deflector tang should be located centrally in its hole in the top plate To Adjust Remove rear screw which secures tape deflector spring to the cover plate Loosen forward screw Posi tion tape deflect...

Page 47: ...OWER CONTACT SPRING B CONTACT GAP START AND STOP CONTACTS Requirement ________ _____ _ _ Min 0 012 inch Max 0 018 inch Front Views CONTACT OPERATING LEVER To Adjust Bend upper contact spring C CONTACT...

Page 48: ...s Use normal signal line direct current of 60 rna 10 or 20 rna 10 to strobe the contacts MIN CLOSURE STOP CONTACT 95 DIV START CONTACT 60 DIV Note 2 Breaks are permissible within 5 divisions of the be...

Page 49: ...REWS Requirement When the rub out permutation code is present the rub out deleter bail should rest against the lower projec tion of the sensing pin To Adjust Loosen mounting screws friction tight Posi...

Page 50: ...swinger should be centrally located with respect to the extension on sensing pin To Adjust Loosen contact assembly mounting screws Position contact assem bly to meet requirement Re tighten mounting s...

Page 51: ...3 Requirement Contact breaks will be permitted between the 15 mark and the 55 mark of the fifth pulse The magnitude of the breaks must not extend beyond these limits To Adjust Loosen bracket contact m...

Page 52: ...start stop contact gap Requirement Min 0 018 inch Max 0 025 inch To Adjust Loosen clampscrew securing yield arm to timing arm friction tight Position timing arm to meet require ment Retighten clampscr...

Page 53: ...nce between contacts when tape slack arm is raised to its maxi mum height Requirement ISS 5 SECTION 573 127 703 Min 0 010 inch Max 0 020 inch To Adjust Loosen clampscrew Set contact gap by positioning...

Page 54: ...entric to meet require ment Retighten clampscrew C BLOCKING BAIL ECCENTRIC PIVOT To Check Trip clutch Hold armature attracted Hold main shaft latched in stop position Check clearance between blocking...

Page 55: ...dge of lid may touch top plate and some change in this clearance may be expected Requirement r Min some Max 0 003 inch clearance between rear bearing surface and tape guideplate To Adjust Loosen tape...

Page 56: ...Lid Spring ro Check Hold tape guideplate horizontally Unlatch tape lid Requirement Min 28 oz Max 48 oz to start tape lid bail moving TAPE LID TAPE LID RELEASE PLUNGER RELEASE PLUNGER SPRING TAPE LID B...

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