NBS TECHNICAL NOTE 744

Disclosures On:

New Syntheses of Perfluorostyrene

and Other Highly Fluor 'mated Derivatives

Temperature-, Radiation-, and Vacuum-Resistant Magnetic Tape

Conductometric Titration Cell

Mill Work Positioner

Process for Fabricating Superconducting Microbridges

Apparatus for Displaying Average Wind Vane or Other Shaft Position

Document Numbering Machine Responsive to a Staple

in a Print Area for Printing in an Alternate Area
NATIONAL BUREAU OF STANDARDS

The National Bureau of Standards1 was established by an act of Congress March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and

technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measure- ment system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau consists of the Institute for Basic Standards, the Institute for Materials Research, the Institute for Applied Technology, the Center for Computer Sciences and

Technology, and the Office for Information Programs.

THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consistent system of physical measurement; coordinates

that system with measurement systems of other nations; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce. The Institute consists of a Center for Radiation Research, an Office of Measurement Services and the following divisions: Applied Mathematics—Electricity—Heat—Mechanics—Optical Physics—Linac

Radiation2—Nuclear Radiation 2—Applied Radiation2—Quantum Electronics3—

Electromagnetics3 —Time and Frequency3—Laboratory Astrophysics3—Cryogenics3

. THE INSTITUTE FOR MATERIALS RESEARCH conducts materials research lead- ing to improved methods of measurement, standards, and data on the properties of

well-characterized materials needed by industry, commerce, educational institutions, and

Government-; provides advisory and research services to other Government agencies;

and develops, produces, and distributes standard reference materials. The Institute consists of the Office of Standard Reference Materials and the following divisions: Analytical Chemistry—Polymers—Metallurgy—Inorganic Materials—Reactor

Radiation—Physical Chemistry.

THE INSTITUTE FOR APPLIED TECHNOLOGY provides technical services to pro- mote the use of available technology and to facilitate technological innovation in industry and Government; cooperates with public and private organizations leading to the development of technological standards (including mandatory safety standards), codes and methods of test; and provides technical advice and services to Government agencies

upon request. The Institute also monitors NBS engineering standards activities and

provides liaison between NBS and national and international engineering standards

bodies. The Institute consists of a Center for Building Technology and the following

divisions and offices: Engineering Standards Services—Weights and Measures—Invention and Innovation—Product Evaluation Technology—Electronic Technology—Technical

Analysis—Measurement Engineering—Fire Technology—Housing Technology4 —Federal Building Technology4—Building Standards and Codes Services4—

Building Environment4—Structures, Materials and Life Safety4—Technical

Evaluation and Application4

. THE CENTER FOR COMPUTER SCIENCES AND TECHNOLOGY conducts re- search and provides technical services designed to aid Government agencies in improving cost effectiveness in the conduct of their programs through the selection, acquisition,

and effective utilization of automatic data processing equipment; and serves as the principal focus within the executive branch for the development of Federal standards for automatic data processing equipment, techniques, and computer languages. The Center

consists of the following offices and divisions: Information Processing Standards—Computer Information—Computer Services —Systems Development—Information Processing Technology.

THE OFFICE FOR INFORMATION PROGRAMS promotes optimum dissemination and accessibility of scientific information generated within NBS and other agencies of

the Federal Government; promotes the development of the National Standard Reference Data System and a system of information analysis centers dealing with the broader

aspects of the National Measurement System; provides appropriate services to ensure

that the NBS staff has optimum accessibility to the scientific information of the world,

and directs the public information activities of the Bureau. The Office consists of the following organizational units: Office of Standard Reference Data—Office of Technical Information and

Publications—Library—Office of International Relations.

1 Headquarters and Laboratories at Gaithersburg, Maryland, unless otherwise noted ; mailing address Washington, D.C. 20234.

2 Part of the Center for Radiation Research.

3 Located at Boulder, Colorado 80302.

* Part of the Center for Building Technology.
itIONAL BUREAU OF STANDARDS

NOV 3 o mi

\tioo DISCLOSURES ON:

W1S3

New Syntheses of Perfluorostyrene and

Other Highly Fluorinated Derivatives

Temperature-, Radiation-, and Vacuum-Resistant Magnetic Tape

Conductometric Titration Cell

Mill Work Positioner

Process for Fabricating Superconducting Microbridges

Apparatus for Displaying Average Wind Vane

or Other Shaft Position

Document Numbering Machine Responsive to a Staple in a Print Area for Printing in an Alternate Area

David Robbins and Alvin J. Englert, Editors

Patent Adviser's Office

National Bureau of Standards

Washington, D.C. 20234

NBS Technical Notes are designed to supplement the Bureau's regular publications program. They provide a means for making available scientific data that are of transient or limited interest. Technical Notes may be

listed or referred to in the open literature.

\

s

'VauO^"'

U.S. DEPARTMENT OF COMMERCE, Peter G. Peterson, Secretary

NATIONAL BUREAU OF STANDARDS, Lawrence M. Kushner, Acfing Director,

Issued November 1972
National Bureau of Standards Technical Note 744

Nat. Bur. Stand. (U.S.), Tech. Note 744, 31 pages (Nov. 1972) CODEN: NBTNAE

For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 (Order by SD Catalog No. C13.46:744). Price 55 cents.
PREFACE

This NBS Technical Note is one of a continuing

series entitled "Disclosures on ...." This series consists

of short descriptions of recent developments from the

Department of Commerce primary operating units, departmental staff offices, and their contractors. It is

believed that these developments have important commercial

applications. Unless otherwise stated in the description

of a development, the property rights therein have been

retained by the United States as represented by the

Secretary of Commerce.

Previous NBS Technical Notes in this series are

NBS Technical Notes 237, 253, 263, 282, 287, 295, 437, 440

and 536.

David Robbins

Patent Adviser

in
CONTENTS

Title

New Syntheses of

Perfluorostyrene and Other

Highly Fluorinated

Derivatives

Temperature- , Radiation-

,

and Vacuum-Resistant

Magnetic Tape

Conductometric Titration

Cell

Author ( s

)

Page

L. A. Wall 1

J. M. Antonucci

D. W. Brown

K. F. Plitt 4

T. B. Hoover

Mill Work Positioner J. M. Holloway

K. H. Gebert

8

Process for Fabricating

Superconducting Microbridges

Apparatus for Displaying

Average Wind Vane or Other

Shaft Position

L. 0. Mullen

H. H. Crouser

10

12

Document Numbering Machine

Responsive to a Staple in

a Print Area for Printing

in an Alternate Area

R. J. Varson

R. L. Johnson

19

IV
ABSTRACT

This Note describes and illustrates seven

developments that are believed to embody interesting

and unusual solutions to current problems in their fields

KEY WORDS

Conduc tometry; decoding matrix; f luoroolef ins;

integrator; magnetic sensing probe; magnetic tape;

microbridge; numbering machine; perfluorostyrene; shaft

position encoder; staple detector; superconducting;

synthesis, chemical; titration; wind vane; work positioner.

NEW SYNTHESES OF PERFLUOROSTYRENE AND OTHER HIGHLY

FLUORINATED DERIVATIVES

L. A. Wall, J. M. Antonucci and D. W. Brown

U. S. Pat. No. 2,874,197 to Dixon discloses that

certain f luoroolef ins are capable of reacting with organolithium compounds by an addition-elimination process that

results in the formation of new fluoroolef ins and lithium

fluoride. The general reaction scheme is

RLi + CX

1

X

2

=CFY > RCYKJX^ + LiF

where X^ and X2 are both electronegative atoms or groups

and Y is F or a fluoroalkyl group.

The application of this method to the synthesis of

perfluorostyrene by the reaction of perf luorophenylithium

and a moderate excess of tetraf luoroethylene at low

temperatures (-80 to 20° C) failed to yield any of the

desired monomer. Instead a very complex mixture of solid

products was isolated. It is anticipated that the desired

monomer will be useful for the preparation of new thermally

stable polymeric materials.

Careful analysis of all the chief products and

reactants in a series of investigations enabled us, however,

to develop a process capable of producing the desired

monomer. By employing a very large excess of tetrafluoroethylene (threefold or greater) and controlled reaction

times at low temperatures, it was possible to form

perfluorostyrene in fair yields (10-20%) • The formation of

perfluorostyrene and the other monomers by this reaction was

followed most conveniently by gas-liquid chromatography.

From these studies, it was found that the yield of monomer

is quite time dependent, reaching a maximum at a certain

reaction time and decreasing thereafter. As expected, the

optimum reaction time varies with the temperature of the

reaction and with the specific reaction mixture employed.
General Method of Synthesis

The general scheme is

C r F c Li + CF =CFX > C.F C CF=CFX

6 5 2 6 5

where X = F, CTj H, CF

3

Synthesis of Perf luorophenyl lithium

Direct Metallation . Pentafluoroiodobenzene in

ether was lithiated at -20 to 0° C by use of a lithium

dispersion in paraffin. The technique employed was

essentially that used to lithiate conventional halobenzenes

Exchange Reaction . Pentaf luorobenzene in ether

was treated with an organolithium reagent, such as methyllithium, at -80° C to give the desired perfluorophenyl

lithium. The technique employed was essentially that

reported by Tamborski et al . , J. Org. Chem. 29, 2385 (1964)

Synthesis of Perfluorostyrene

One mole of perfluorophenyl lithium in 15 liters of

ether was prepared in a 30-liter steel bomb maintained at

-80° C. To this was added carefully 15 moles of tetrafluoroethylene. The bomb was sealed and then agitated for

3 to 5 days at -20 C. The reaction mixture was treated as

follows at the conclusion of the reaction: any unreacted

perfluorophenyl lithium was hydrolyzed, the unreacted

tetrafluoroethylene was removed and collected. The ether

solution was then worked up in the usual way to yield 20%

perfluorostyrene, b.p. 122" C.

The same technique also proved successful in the

reaction of trifluoroethylene with perfluorophenyl lithium

to give P-hydroheptafluorostyrene. Other successful

syntheses included the reaction of perfluorophenyl lithium

with chlorotrifluoroethylene and perf luoropropylene to give

3 -c hi oroheptafluorostyrene and perfluoro- 3 -methyl styrene,

respectively.
Special Method of Synthesis of Perf luorostyrene

A related but somewhat different synthesis of

perfluorostyrene was discovered in the course of these

investigations and involves the dehydrofluorination of

Q'-hydrononafluoroethylbenzene (Wall et al. U. S. Pat. No.

3,265,746) with methyl lithium at -80° C, followed by

warming to 25° C. The reaction sequence is believed to be

CH~Li __ o^® c C.F,CFHCF —~i > [C.F c CFLiCFj to zo—

u

> c F CF=CF

6 5 3 ether L 6 5 3 —LiF 6 5 2

(-CH4

)

-80° C

Yields of perfluorostyrene of the order of 85 to 90% can be

realized by this method.
TEMPERATURE-, RADIATION-, AND VACUUM-RESISTANT MAGNETIC TAPE

K. F. Plitt
TEMPERATURE-, RADIATION-, AND VACUUM-RESISTANT MAGNETIC TAPE

K. F. Plitt

Satellite tape recorders frequently fail because

the magnetic tape sticks to a head surface. This is

apparently due to the transfer of material from the tape

to the head surface until that surface adheres easily to

the tape.

In addition to a tape that will not contaminate head

surfaces, a satellite recorder requires a magnetic tape that

does not change properties when exposed to hard vacuum and

has a high resistance to radiation. Further, for some

applications, the tape should be capable of operating

properly after sterilization by gaseous chemicals or by

heating for 24 hours at 140° C.

The tape described in this note meets these requirements. It consists of a base film 10 coated on each side

with a different coating. The base film is a polyimide

material chosen for its stability, temperature resistance,

mechanical properties, and freedom from liquid plasticizers

and volatile constituents. The coating 11 on the front side

of the base film consists of a binder, magnetic iron oxide,

and conductive carbon. It is applied from solution, dried,

and cured. Suitable binders are polyimide resins and

polyamide-imide resins. Other materials that may be used

include high temperature resistant polymers such as

polybenz imidazoles and pyrrones . The coating 12 on the

back side of the base consists of a binder, preferably the

same polymer used in the coating on the front side, conductive carbon, and in some cases powdered polytetraf luoroethylene. Coating 12 reduces cupping of tape during

curing and provides lubrication for tapes that are to be

used in "endless-loop" tape recorders.
CONDUCTOMETRIC TITRATION CELL

T. B. Hoover
CONDUCTOMETRIC TITRATION CELL

T. B. Hoover

Ten microequivalents or less of a specimen dissolved

in 25-50 ml of solvent can be titrated using this cell. The

titration, which may be performed in an inert atmosphere, is

monitored by measuring the solution conductivity as the

reagent is added. The solution is stirred magnetically and

the electrodes are positioned away from the stirrer to avoid

current induction by the rotating magnetic field.

As shown in the figure, the cell consists of an

electrode chamber 10 and a flask 12 with a neck 14 and a

stirring chamber 16. A feed arm 18 extending tangentially

from the stirring chamber 16 is connected to the bottom of

the electrode chamber 10 and a return arm 20 is connected

to the flask neck 14. A magnetic stirring bar 22 introduced

into the stirring chamber 16 through the neck 14 is driven

by a rotating magnet drive 24. The solution is thus

centrifugally stirred and circulated through the cell. The

electrode circuit or "loop" (not shown), being outside the

fringing stirrer field, avoids the induction of extraneous

currents

.

The electrode chamber top has a standard taper joint

26 for receiving interchangeable dipping electrodes of

different cell constants appropriate to the solvent-reagent

system used. The flask 12 may be provided with a serum cap

(not shown) through which the titrant and a purge or filling

gas for controlling the cell atmosphere may be introduced

by hypodermic needles.
MILL WORK POSITIONER

J. M. Holloway and K. H. Gebert

This device may be used to position work on a

milling machine.

In the figures bolt 10 passes through post 11.

Machine nut 12 is threaded on one end of the bolt and

T-nut 13 is threaded on the other end. Stop rod 14 is

made off set and has one end located in one of the holes

15 in the post. Instead of 14, two straight arms and a

swivel clamp may be used. When this arrangement is used,

one of the arms is located in a fixed position between the

clamp and post 11, while the other arm is located in the

clamp. By proper adjustment of the clamp, an end of the

second arm may be moved horizontally, vertically, or along

a desired angle.

In a typical operation, T-nut 13 is positioned in a

slot in the table of the milling machine. The T-nut is

tightened. A piece of work is placed in a vise on the table.

Stop rod 14 is then positioned in the hole in post 11,

corresponding to the height of the work, and the rod is

rotated to make fine adjustments in height, if required,

before it is clamped by the related screw 16. The piece of

work is then moved horizontally in the vise to engage the

end of stop rod 14 and is thereby positioned precisely on

the milling machine.

8
MILL WORK POSITIONER

J. M. Holloway and K. H. Gebert

FIG. I fig. 2

FIG. 3
PROCESS FOR FABRICATING SUPERCONDUCTING MICROBRIDGES

L. 0. Mullen

2xi QUARTZ

FIBER

EVAPORATING

SOURCE

WATER COOLED

HEARTH

10
PROCESS FOR FABRICATING SUPERCONDUCTING MICROBRIDGES

L. O.Mullen

The essence of a superconducting microbridge is a

controlled constriction of a strip of superconducting thin

film where the conductivity is weakened in a well-defined

area. This note describes a process for precisely controlling the width and thickness of the film in the

constriction or metallic bridge.

The structure shown in the figure is positioned in a

suitable vacuum. An evaporating source 10 comprises a ball

of superconducting material , such as niobium, and is placed

in a water cooled hearth 11. The source is heated by a

conventional electron beam arrangement, not shown, to

between 3100° K to 3500° K. Some of the molecules,

evaporated from the source, travel in a straight line toward

substrate 12, which is preferably sapphire for niobium, and

a thin film 13 is deposited on the surface of the substrate.

The thickness and width of the film deposited along a

selected line to form a metallic bridge 14 is controlled by

properly positioning a thin quartz fiber 15. (The fiber

may be 2 microns thick.) More specifically, the width and

thickness of the bridge are controlled by the penumbra 16

of the shadow 17 produced by the fiber. The width and

thickness of the penumbra are in turn controlled by the

diameter and position of the fiber 15 from substrate 12.

The thickness of the bridge also depends upon the time and

rate of deposition of the film.

11
APPARATUS FOR DISPLAYING AVERAGE WIND VANE OR OTHER SHAFT

POSITION

H. H. Crouser

CONDUCTOR

NON-CONDUCTOR

Ej (or ground)

FIG. I BOTTOM VIEW

OF

CODE DISK

12
APPARATUS FOR DISPLAYING AVERAGE WIND VANE OR OTHER SHAFT

POSITION

H. H. Crouser

This device encodes instantaneous shaft position in

a cyclic bit code having equal on-and-off distributions and

time integrates each bit. If the integral exceeds a

threshold, the bit is fed to a code converter which drives

a display unit. The device is particularly useful in

reporting average wind directions from a remote batterypowered weather station.

As shown in Fig. 1 the fluctuating wind vane or

other shaft 10 is equipped with a cyclic code disk 12. The

first and second outer rings 14 and 16 of the disk each have

a 180 arcuate metal segment. The third ring 18 has two

evenly spaced 90° segments and the fourth ring 20 has four

45 segments. For greater shaft position resolution there

could be provided a fifth ring with eight 22.5° segments,

and so on. The continuous inner band 22 is the common circuit terminal energized with voltage E. from brush 24. The

voltage is picked up from the rings 14, 16, 18 and 20 by

brushes D, C, B and A respectively. For ease of construction

these brushes are positioned at 90° intervals around the

disk 12. The resulting cyclic code of the sixteen wind

directions is as follows.

N 0000 S 0011

N NE 1000 s sw 1011

NE 1100 sw 1111

E NE 0100 w sw 0111

E 0110 w 0101

E SE 1110 W NW 1101

SE 1010 NW 1001

S SE 0010 N NW 0001

13
APPARATUS FOR DISPLAYING AVERAGE WIND VANE OR OTHER SHAFT

POSITION

H. H. Crouser

SW

OPEN

CLOSED Ej/2

50% CLOSED E[/4

FIG. 2

SW(e.g.A)

^h^>Eo

SW

OPEN Ei

CLOSED Ei/2

50% CLOSED 0.75 E

FIG.4

(A)SW

D

^

C

V

14
The circuit for integrating (smoothing) the

individual encoder output bits is shown in Fig. 2. The

voltage E. picked up by a brush such as A (shown as a switch

arm) is applied across two equal resistors. A capacitor is

connected across the lower resistor and a zener diode is

back connected to the junction of the resistors. The

resistor values preferably are high to limit the current

drain from the source E. and the capacitance value is

selected to provide the desired averaging time constant. If

the brush contact time exceeds 50% the voltage across the

capacitor generally will be between E./4 and E./2. The

zener diode therefore is selected to conduct at slightly

more than E./4, providing the output bit "1".

The four outputs, A to D, may be connected to a

conventional decoding matrix with 16 output lines for displaying the 16 compass point wind directions. The top half

of Fig. 3 shows the first three lines of such a matrix. The

bottom half of Fig. 3 shows an alternative matrix which

provides 8 overlapping wind directions. Here the direction

NNE is indicated by the simultaneous energization of the

lines "N" and "NE".

To prevent damage to the power supply, brushes, or

code disk in the event one of the brushes A to D is

accidentally shorted to ground, the common voltage applied

to the inner disk ring 22 may be ground rather than the

supply voltage E. • Fig. 4 shows the smoothing circuit in

this case. The output bit "1" is produced when the brush

circuit closure time is less than 50%. This causes an

inversion of the cyclic code, with a corresponding change

in the decoding matrices, shown in Fig. 5. Also the zener

diode is selected to conduct at slightly more than 0.75 E..

Under some weather service conditions it may be

desirable to display the average wind direction in a 36-

point format. A cyclic code having equal on-and-off

distributions for this purpose is as follows.

15
DIR. CODE DIR. CODE

36 000000

01 100000

02 110000

03 111000

04 011000

05 001000

06 001100

07 101100

08 111100

09 110100

10 010100

11 000100

12 000110

13 100110

14 110110

15 111110

16 011110

17 001110

18 001111

19 101111

20 111111

21 110111

22 010111

23 000111

24 000011

25 100011

26 110011

27 111011

28 011011

29 001011

30 001001

31 101001

32 111001

33 110001

34 010001

35 000001

16
APPARATUS FOR DISPLAYING AVERAGE WIND VANE OR OTHER SHAFT

POSITION

H. H. Crouser

A B C D

I7

*

+

^ NVERTER

AND

Pv

u U

N = A BCD

NNE = ABCD

NE = ABCD

:3T

OR

"Ln

"N"= ABC+ BCD

"ne" = acd+bcd

1 1 1 1 1 1 1 FIG. 3

17
APPARATUS FOR DISPLAYING AVERAGE WIND VANE OR OTHER SHAFT

POSITION

H. H. Crouser

/\ EJ c

(

<

)

7 INVERTER

^ ^

7

^

J AND

i

( *

N = A B CD

<

< —L^

- —r^

(

<

i

(

< vs

i ^_^ mpI\J t - Aapph D L> U

^ )

<

<

1

_, OR

4 -*-"N" = ABC+ BCD

<

<

1

i >

4 mVV t V1

<

m —*-"NE" = ACD+BCD

<

i r

1

1 FIG.5

18
DOCUMENT NUMBERING MACHINE RESPONSIVE TO A STAPLE IN A

PRINT AREA FOR PRINTING IN AN ALTERNATE AREA

R. J, Varson and R. L. Johnson

In processing a multi-element separable document

such as a tax return, it is common to print a document

locator number (DLN) on all the elements to facilitate their

location after the document is separated. The DLN can be

automatically printed by a document feeding and numbering

machine, provided the document does not contain a staple in

the assigned print area. A staple will damage the print

wheels, result in an illegible number, or cause an erroneous

advance of the print wheels.

The purpose of this apparatus is to sense a staple

in the print area of a document and delay the printing of

the number so that it appears in an alternate area.

The apparatus is shown schematically in Fig. 1. It

includes an inductive staple sensing probe (SP) 1 which is

mounted ahead of the printer 24 in the document feed path.

The sensing probe 1 drives a loaded oscillator (OSC) 2

which in turn strobes an AND circuit 4.

As a document is fed into the machine it interrupts

a light beam impinging on a photocell (PC) 12, causing the

photocell amplifier (PA) 13 to produce an output as long as

the document is passing over the photocell 12. The leading

edge of this output pulse is delayed by a delayed make

circuit (DM) 14. The amount of delay is adjustable by the

operator and serves to adjust the position of the first print

on the document. The output of the delayed make circuit 14

is also used to trigger a pulse width control circuit (PWC)

3 which establishes a zone to be tested for staples by

providing an enable to AND circuit 4.

If the sensing probe 1 detects a staple and therefore strobes AND circuit 4 while the latter is enabled by

the output of the pulse width control circuit 3, the strobe

signal will pass through and initiate a pulse width control

curcuit 5. This circuit 5 expands the staple pulse so that

a staple detected at any time in the test zone will appear

to exist during the entire test zone.

19
DOCUMENT NUMBERING MACHINE RESPONSIVE TO A STAPLE IN A

PRINT AREA FOR PRINTING IN AN ALTERNATE AREA

R. J. Varson and R. L. Johnson

LU

•z, trQ. kj

(M

ho

20
The previously mentioned delayed make circuit 14

identified the location of the first print relative to the

sense probe 1. Its output is applied to a pulse width

control circuit 15 where it is extended beyond the first

print location at the print head. The output of this pulse

width control circuit 15 triggers a delayed make circuit 16

which delays it almost to the first print. Pulse 16 enables

an AND circuit 6 at a time relative to the top of the

document so that pulse 6 will not vary with the location of

the staple. Pulse 6 triggers a pulse width control circuit

7 which is operator adjusted to set the alternate print

location ("staple detected in first print location"). Pulse

7 is applied to an inverting circuit (NOT) 8. The

restoration of pulse 8 at the trailing edge of pulse 7

triggers a pulse width control circuit 9 to produce a short

pulse which passes through an OR gate 10 to operate a reed

relay (RR) 11. The OR gate 10 is needed so that the reed

relay 11 can be operated from more than one source to

trigger the print circuits in printer 24.

If no staple pulse 1 occurred to coincide with

enable 3 then circuits 4 through 9 as described above will

remain inactive and pulse 16 will initiate a delayed make

circuit 17 which delays it to approximately the middle of

the test zone. Pulse 17 strobes an AND circuit 18 which is

enabled by NOT circuit 8 if the alternate print logic was

not activated by a staple. Pulse 18 passes through OR gate

10 to operate the reed relay 11 for a normal first print.

Should a second print be desired 5 a "select second

print" circuit 19 enables an AND gate 20 allowing the

photocell 12 to initiate a delayed make circuit 21. This

circuit 21 is operator adjustable and delays the pulse to

set the second print location and start a pulse width

control circuit 22 which extends it beyond the second print

location and triggers a delayed make circuit 23. This

circuit 23 delays the leading edge to produce the print

pulse. Pulse 23 passes through OR gate 10 and operates the

reed relay 11 to trigger the printer 24.

Figs. 2 and 3 show two examples of the pulses produced by the circuits for documents of different sizes with

staples in and after the test zone. The conditions for

Fig. 2 are:

21
Minimum Page Length - Close Spaced

Minimum Delay First Print

Minimum Delay Second Print

First Document - Staple in Test Zone

Second Document - Staple after Test Zone

For Fig. 3 the conditions are:

Five Inch Page Length - Wide Spaced

First Print \ Inch Below Top

Alternate Print One Inch After First

Second Print \ Inch from Bottom

First Document - Staple Early in Test Zone

Second Document - Staple Middle of Test Zone

The above-described apparatus is designed to print

near the top of the document. Since staples are seldom

encountered in other areas, the staple detection is applied

only to the first print. However, the staple detection

could be applied to the second print if desired. Also, the

number of prints per document could be expanded.

22
DOCUMENT NUMBERING MACHINE RESPONSIVE TO A STAPLE IN A

PRINT AREA FOR PRINTING IN AN ALTERNATE AREA

R.. J. Varson and R. L. Johnson

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DOCUMENT NUMBERING MACHINE RESPONSIVE TO A STAPLE IN A

PRINT AREA FOR PRINTING IN AN ALTERNATE AREA

R. J. Varson and R. L. Johnson

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FORM NBS-114A (1-71) U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO.

NBS TN-744

2. Gov't Accession No.

3. Recipient's Accession No.

4. TITLE AND SUBTITLE

Disclosures on: [See list of titles in item 16]

5. Publication Date November 1972

6. Performing Organization Code

7. AUTHOR(S)

David Robbins and Alvin J. Englert, Editors

ft. Performing Organization

10. Project/Taslc/Work Unit No. 9. PERFORMING ORGANIZATION NAME AND ADDRESS

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

11. Contract/Grant No.

12. Sponsoring Organization Name and Address Same as item 9.

13. Type of Report & Period Covered

Final

14. Sponsoring Agency Code

15. SUPPLEMENTARY NOTES

16. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bibliography or literature survey, mention it here.) This Note describes and illustrates seven developments that are

believed to embody interesting and unusual solutions to current problems

in their fields.

Disclosure titles:

New Syntheses of Perf luorostyrene and Other Highly Fluorinated Derivative

Temperature-, Radiation-, and Vacuum-Resistant Magnetic Tape

Conduc tometrie Titration Cell

Mill Work Positioner

Process for Fabricating Superconducting Microbridges

Apparatus for Displaying Average Wind Vane or Other Shaft Position

Document Numbering Machine Responsive to a Staple in a Print Area

for Printing in an Alternate Area

KEY WORDS: Conduc tometry; decoding matrix; f luoroolef ins; integrator;

magnetic sensing probe; magnetic tape; microbridge; numbering machine;

perfluorostyrene; shaft position encoder; staple detector;

superconducting; synthesis, chemical; titration; wind vane; work

positioner.

17. KEY WORDS (Alphabetical order, separated by semicolons)

See No. 16.

18. AVAILABILITY STATEMENT

fxl UNLIMITED.

n FOR OFFICIAL DISTRIBUTION. DO NOT RELEASE

TO NTIS.

19. SECURITY CLASS

(THIS REPORT)

UNCLASSIFIED

20. SECURITY CLASS

(THIS PAGE)

UNCLASSIFIED

21. NO. OF PAGES

31

22. Price 55 cents

* U. S. GOVERNMENT PRINTING OFFICE 0.972—511-320/101 USCOMM-DC 66244-P7J

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