INSTRUCTION MANUAL FOR THE OBLIQUE DRIVE B CONFIGURATION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP74B00752R000100180001-6
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 31
• Document Creation Date: December 22, 2016
• Document Release Date: December 13, 2010
• Sequence Number: 1
• Publication Date: August 31, 1956
• Content Type: REPORT

5147-25-9-56
Approved For Release 2010/12/13: CIA-RDP74B00752R000100180001-6
INSTRUCTION MANUAL
FOR THE
OBLIQUE DRIVE
B CONFIGURATION
31 AUGUST 1956
COPY NO 22
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OBLIQUE DRIVE
TABLE OF CONTENTS
Section
Page
DESCRIPTION ? ? ? ? ?
?
?
1
1-1. General . ? ? . ? ? ? .
.
.
1
1-2. Major Components . ? ? ? ? ?
?
1
Oblique Drive Motor ? . .
?
?
.
1
Oblique Drive Belt ,. . . ?
?
?
3
Oblique Drive Idler Pulley Assembly
.
.
3
,Detent Brake Assembly . . ? ?
.
.
3
Detent Ring . ? ? .
?
3
Oblique Drive Motor Mounting Bracket
?
?
3
Oblique Drive Belt Pre-load Spring
Assembly. . . . ? ? ? ?
?
.
3
Seeker Switch and Cam Assembly .
.
.
6
Oblique Limit Switches . ?
?
.
6
1-3. 'Leading Particulars . . . .
.
.
6
Oblique Positions ? ? ? . .
.
.
6
Motor Data . . . . ?
?
.
8
Solenoid Data . . ?.
.
8
Power Requirement . . ?
?
.
8
II
THEORY OF OPERATION . ? ?
.
11
2-1. General . . ? . ? ?
.
.
11
2-2. Mode 1 Operation . ? ? ? ?
.
.
11
2-3, Mode 2 Operation ? ? ? ? ?
.
?
13
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B CONFIGURATION
TABLE OF CONTENTS (Cont' d)
Section
III
PREPARATION FOR OPERATION
?
?
Page
. . 17
34. General . ?
?
?
?
.
.
. . 17
IV
MAINTENANCE .
?
?
?
?
19
4 -1 . General . .
?
.
?
?
?
. . 19
4-2. Special Tools ?
?
?
?
.
?
. . 19
4-3. Lubrication .
?
?
?
?
?
. . 19
4-4. Periodic Inspection
?
?
?
?
. . 19
V
OVERHAUL .
?
?
?
?
21
54. General ? ?
?
?
?
?
?
21
VI
PARTS LIST .
?
?
?
?
?
. 23
ILLUSTRATIONS
Page
Oblique Drive, B Configuration ? ? ? ? vi
Oblique Drive Motor . ? ? ? ? ? 2
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OBLIQUE DRIVE
ILLUSTRATIONS (Cont'd)
Figure
Page
1-3.
Oblique Drive Idler Pulley Assembly .
4
1-4.
Detent Brake Assembly . . . .
5
1-5.
Detent Ring . . . ? .
7
1-6.
Seeker Switch Assembly . . .
9
2-1.
Oblique Drive, B Configuration, Electrical
Schematic . ? . . .
12a
2-2.
Mode 1 Oblique Sequence Chart . .
14
2-3.
Mode 2 Oblique Sequence Chart . .
15
1
J
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B CONFIGURATION
Figure 1-1. Oblique Drive, B Configuration
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OBLIQUE DRIVE
Section I
DESCRIPTION
1-1. GENERAL (See figure 1-1. )
The Oblique Drive, B Configuration, in conjunction with the Optical
Structure and the Programmer, provides the Model 73-B Camera
Configuration with one vertical and six oblique positions. The B Con-
figuration, unlike most camera configurations, is not installed on a
rocking-type mount. The B Configuration rotates the lens cone to
obtain oblique positions, instead of tilting the entire camera as is done
in other systems. The seven positions of the lens cone are located
24.5 degrees apart. The distance between the extreme right oblique
position and the extreme left oblique position is 147 degrees.
1-2. MAJOR COMPONENTS
The Oblique Drive consists of the following major components: a
Drive Motor; a Drive Belt; a Drive Belt Idler Pulley Assembly; a Detent
Brake Assembly; a Seeker Switch and Cam Assembly; two Oblique Limit
Switches; a Detent Ring; an Oblique Drive Motor Mounting Bracket; a
Drive Belt Pre-load Spring Assembly; and the necessary electrical wir-
ing and connectors to complete the system.
a. Oblique Drive Motor. (See figure 1-2. ) The oblique drive
motor is a reversible, permanent magnet motor operating on 27.5 ?2.5
per cent volts dc, with a normal output speed of 57 ?2.5 per cent rpm at
25 inch-pounds of torque. Two methods of braking are used. A friction-
type, magnet brake is incorporated in the drive motor to stop rotation
after drive power has been removed. Dynamic braking of the drive
motor is obtained through the oblique motor power relays in the program-
mer unit. When the power relays are de-energized they short circuit
the counterelectromotive force developed by the motor after the drive
power has been removed. This dynamic braking, with the braking sup-
plied by the magnetic brake, stops the oblique motor with a minimum of
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B CONFIGURATION
2
I. Motor Cable Connector
2. Motor Connector
3. Drive Pulley
4. Oblique Dr ive Motor
_
Figure 1-2. Oblique Drive Motor
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OBLIQUE DRIVE
motor over-travel. An aluminum drive pulley is mounted on the motor
shaft, and is used to drive the oblique drive belt. The motor is secur-
ed to a mounting bracket by four bolts.
b. Oblique Drive Belt. ,(See figure 1-3.) The oblique drive belt
is a rubber, steel-corded, tooth-type unit, 0.75 inches wide, with a
circumference of 75 inches. The teeth have a pitch of 0.50 inches.
The drive belt is used to drive the lens cone through its oblique posi-
tions.
c. Oblique Drive Idler Pulley Assembly. (See figure 1-3.) The
oblique drive idler pulley assembly consists primarily of two idler
pulleys, two adjusting arms, two eccentric sleeves, and two idler pul-
ley studs. The idler pulley assembly is used to adjust the tension on
the oblique drive belt.
d. Detent Brake Assembly. (See figure 1-4.) The detent assem-
bly consists of a solenoid, a brake shoe, a holding brace, a brake shoe
spring, and the necessary linkage for the operation of the detent
assembly. When an oblique power relay in the programmer is energiz-
ed, power is supplied to the detent solenoid which, in turn, through the
brake shoe linkage removes the brake shoe from the detent ring on the
intermediate optical structure. The oblique drive motor is then free to
drive the lens cone to the desired position. When the bridge becomes
balanced, the oblique power relays are de-energized. This stops the
drive motor and de-energizes the detent solenoid, allowing the brake
shoe to press against the ring under the influence of the detent spring
and hold the cone in position.
e. Detent Ring. (See figure 1-5.) The detent ring is an arc-shaped
aluminum alloy ring which is bolted directly to the lens cone. As noted
in the above paragraph, the ring acts as the pressure plate for the brake
shoe.
f. Oblique Drive Motor Mounting Bracket. (See figure 1-2.) The
oblique drive motor mounting bracket is an aluminum alloy bracket
attached to the intermediate optical structure. The drive motor is secur-
ed to the bracket by four bolts.
g. Oblique Drive Belt Pre-load Spring Assembly. (See figure 1-4.)
The pre-load spring assembly consists of a spring housing, a spring,
an adjustment bolt, and a belt clamp. The pre-load spring assembly is
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B CONFIGURATION
1. Drive Belt
2. Idler Pulleys
3. Adjuster Arms
4. Drive Pulley
4
Figure 1-3. Oblique Drive Idler Pulley Assembly
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OBLIQUE ' DRIVE
1.
Spring Link
9.
Spring Bracket
2.
Belt Clamp
10.
Latching Arm Assembly
3.
Adjustment Bolt and Nut
?11.
Spring Bolt and Jam Nut
4.
Pre-Load Spring (Inside Housing)
12.
Torque Arm Bracket
5.
Spring Housing
13.
Lens
6.
Detent Ring
14.
Solenoid Connector and Cable
7.
Holding Brace
15.
Solenoid
8.
Spring
16.
Solenoid Plunger
5147
Figure 1-4. Detent Brake Assembly
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B CONFIGURATION
used to prevent excessive slippage of the belt on the lens cone when the
cone is stopping or starting.
h. Seeker Switch and Cam Assembly. (See figure 1 -6.) The
seeker switch and cam assembly consists of seven microswitches, a
switch mounting bracket, and a fixed cam. The switches are attached
to the intermediate optical structure and the cam is attached to the
lens cbne. Each switch is electrically connected to a resistance point
on the seeker leg of the Wheatstone bridge in the programmer unit.
As thd lens cone moves, the cam makes and breaks the switches until
the two legs of the bridge are balanced. This de-energizes the micro-
positioner relay in the programmer which, in turn, de-energizes the
oblique power relays, removing drive power from the oblique drive
motor.
i. Oblique Limit Switches. (See figure 1 -6. ) Two oblique limit
switches are attached to the intermediate optical structure. If the
oblique drive motor does not stop at the extreme right or left oblique
position, the respective limit switch will open, de-energizing the
respective oblique motor power relay, removing power from the drive
motor.
1-3. LEADING PARTICULARS
a. Oblique Positions.
Number of Right Oblique Positions Mode 1. . 3
Mode 2. . 1
Number of Left Oblique Positions . Mode 1. . 3
Mode 2. . 1
Distance Between Eacli Lens Cone
Position
24 5 degrees
Distance Between the Extreme Right
and Left Oblique Positions . . Mode 1. . 147
degrees
Mode 2. . 49
degrees
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OBLIQUE DRIVE
1. Ring
2. Mounting Holes
Figure 1-5. Detent Ring
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B CONFIGURATION
b. Motor Data.
Type . . ? ? . . . Permanent Magnet
Operating Voltage ? . . . 27.5 ?2.5 per cent dc
Operating Current . . . . 2.4 amperes dc
Output Speed ? ? . . . 57 ?2.5 per cent rpm
Output Torque . . . . . 25 inch-pounds
c. Solenoid Data.
Operating Voltage . . . . 27.5 ?2.5 per cent dc
Pull-in Current . ^ 11.0 amperes at 78
degrees F
Holding Current.,
? 0. 1 &eres at 78
degrees. F
Stroke . ? ? . . 0.25-inch
Pull . . ? ? . 21.0 pounds
d. Power Requirement . . . 27 ?2.5 per cent dc
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OBLIQUE DRIVE
1.
Limit Switches
4.
Connector
2.
Limit Switch Brackets
5.
Vertical Indicator Light Switch
3.
Seeker Switches
6.
Seeker Switch Bracket
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Figure 1 -6. Seeker Switch Assembly
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B CONFIGURATION
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OBLIQUE DRIVE
Section II
THEORY OF OPERATION
2-1. GENERAL
The information in the following paragraphs, and the electrical
schematic shown in figure 2-1, are included in this section in order
to help the operator trace and correct malfunctions which may be en-
countered during the operation of the Oblique Drive, B Configuration.
2-2. MODE 1 OPERATION
Sequencing is started by a signal from a cam-actuated command
signal switch which energizes a programmer stepping switch. The
position selected by the stepping switch unbalances a bridge circuit.
The signal from the unbalanced bridge circuit energizes a micro-
positioner relay in a direction with respect to the polarity of the signal,
which in turn energizes the appropriate oblique motor power relay.
The energized oblique power relay supplies 28 volts dc from a cam-
actuated oblique motor brake and detent switch to a detent solenoid,
removing the brake shoe from the detent ring; and to an oblique drive
motor magnetic brake which disengages. A split-second later the
power oblique relay applies 28 volts dc to the drive motor, driving the
motor in the desired direction. When the camera reaches the desired
oblique position, the seeker bridge leg switches connect the proper
resistance, balancing the bridge circuit and stopping the oblique drive
motor. If the drive motor fails to stop at the desired oblique position,
the lens cone will continue to move until the respective oblique limit
switch is opened. This will remove the input voltage to the oblique
power relay, de-energizing the relay. When the oblique power relay
is de-energized, it removes power from the oblique motor magnetic
brake, causing the brake to become engaged, and removes power from
the detent solenoid, engaging the brake shoe, and also provides dynam-
ic braking of the oblique drive motor by shorting the motor armature.
The system is now ready to be advanced to the next oblique operation.
See figure 2-2 for a complete sequencing of Mode 1.
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B CONFIGURATION
12
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MODE I
STAND BY
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