Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 71)

----------------------

1

3"

1/4"DIA

Fig. 3. Fabricate

light

shields

illustrated here from

mailing

tube;

note aperture

disc

on

short

tube.

that

K1

and

K4 are

mounted on the out-

side of the

chassis for

easy

access.

Begin

construction

by laying

out and

drilling the mounting

holes

for

the

vari-

ous components.

Then fabricate

one or

both of the

light shields illustrated

in

Fig. 3. (

The longer

light shield

is

used

for large- subject photography,

while

the

shorter

shield

is

best

for subjects

the

size of a tarantula

or smaller.)

Select

cardboard

mailing tubes

with

1" to

P /s"

inner diameter

for the

shields, and

if you

make both shields, use

the

same

tube

to

insure uniform

inner and outer diame-

ters. Also,

glue

a

carbdoard disc

through

the center

of which

has been punched

a

I i" aperture

over one end

of

the

3 "-

long shield.

Then apply a coat

of

flat

black

paint to all

interior surfaces.

Locate

the

center

of the chassis cutout

that is to accommodate

the

light

shield

11a" above the base

of the chassis and

drill a hole through

the chassis to

match

the outer

diameter of the shields.

Then

drill

the same size

hole through a

2 "-

square by

3/4" -thick

pine block, and

se-

cure the block to

the chassis with wood

screws as

illustrated in

Fig. 4.

The

magnifying

lens

which

is to be

cemented

to the wood block

as

shown

serves to concentrate and direct

the

light

from

11

onto

PC1. This lens

should

be

slightly

larger than

the

diameter

of

the

cutout

in

the

pine

block.

The

lens

select-

ed can be

from

a

small reading

glass, or

you

can

order item No. 94,061

for

80

cents

from Edmund

Scientific

Co., 600

Edscorp Bldg., Barrington,

N.J.

08007.

Fig. 4. Light shield, lens,

and

photocell must

share

a common

axis with

control light source.

When

the

cement securing

the

lens to

the pine block

has set,

mount

the com-

ponents ( except

PC1) in place and

wire

them together.

Then place the

section

of

the chassis

containing

the

lens on a

flat

surface, slip

into place

the

long light

shield, and aim the assembly

at a

light

source a

few feet away.

Now,

mount

the

photocell on a

3/4

"-

square

by

2" -long

pine

block

(see Fig.

4).

Place the photocell

-block assembly

on

a 1/4"

thickness

of cardboard,

and

orient

it

behind

the

lens so that

the concen-

trated beam

of

light from the

light source

just covers

the entire

frontal

area of

the

photocell.

Measure the distance

from

the

side and

front of the

chassis

to the

block

to determine

where,

on the other

section

of the chassis,

PC1 must

be

located.

Then

secure

the photocell

assembly

to the

chassis with a

wood

screw and

epoxy

cement, and

solder

the leads

of PC1

into

the circuit.

The solenoid specified

in

the

Parts

List

must

be modified to

operate

the camera

shutter.

To

accomplish

this,

drill

a '32"

hole through

the

flat end of the

plunger;

then

flatten

the pointed

end

of the plung-

er with a

file and drill

and tap

this

end

for

a 6 -32

machine

screw (see

Fig. 5 for

details) .

To

facilitate mounting

the

solenoid

and

camera on a tripod,

a bracket

as

il-

lustrated in Fig. 6

must

be fabricated

from 11:4"

x 1/4" band steel

The leg

lengths

of

the

bracket

are

not

provided

in the

drawing

since

they will

vary de-

pending

on the camera.

The slots

shown

in

the drawing

provide

a

means for ad-

justing the

solenoid position

to

apply

proper shutter

release pressure

for a

wide

variety of cameras.

The control

light

shown

in

Fig.

7

is

actually a

modified two -cell

flashlight,

equipped with a

No.

25

red camera

lens

filter, mounted on a

7"

X

5"

X 3i4" pine

board.

First, remove the batteries

from

PINE

BLOCK

PCI

PINE

BLOCK

LIGHT

SHIELD

1/4"

April, 1969

77

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 115 116

Comentarios a estos manuales

Sin comentarios