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Патент USA US3020823

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Feb. 13,1962
J. G. B‘ HALDEN
3,020,818
DIAZOTYPE AND LIKE PHOTO-COPYING APPARATUS
Filed April 20, 1959
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3 Sheets-Sheet 1
Feb’ 13-, 1962
J. G. s. HALDEN
I
3,020,818
DIAZOTYPE AND LIKE PHOTO-COPYING APPARATUS
Filed April 20, 1959
'
s Sheets-Sheet 2
Feb. 13, 1962
J. G. B. HALDEN
3,020,818
DIAZOTYPE AND LIKE PHOTO-COPYING APPARATUS
Filed April 20, 1959
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H66
mm“ WW
3 Sheets-Sheet 3
’
United States Patent O?ice
3,020,818
Patented Feb. 13, 1962
1
2
3,020,818
fractional variation in length of each individual belt of
the system and/or the possible fractional differences in
DIAZOTYPE AND LIKE PHOTO-COPYING
APPARATUS
Joseph Gerald Brocton Halden, Loughton, England, as
signor to Ozalid Company Limited, Loughton, Eng
land, a British company
Filed Apr. 20, 1959, Ser. No. 807,567
Claims priority, application Great Britain Apr. 24, 1958
10 Claims. (Cl. 95-—89)
diameter along the length of the supporting and/or driv
ing rollers. In the case of a wide sealing belt, tracking
di?icult'ies may arise from various factors such as un~
_ equal wear or stretching of the belt across its width, or
supporting rollers which are not exactly parallel or not
of exactly constant diameter along their length.
'
In certain types of diazotype apparatus the developing
The invention relates to diazotype and like photocopy
ing apparatus of the kind (hereinafter referred to as the
tank or chamber instead of having a ?xed perforated
surface over the area aforesaid from which developing
vapours emanate, is provided with an aperture which is
kind described) in which sheet material is conveyed
closed, or substantially closed, by a moving endless belt
through the apparatus by means employing one or more
or blanket of a foraminous or vapour passing nature,
?exible conveyor belts.
15 disposed internally of the tank or chamber and travelling
Apparatus of this kind commonly comprises either two
sections (i.e. an exposure or printing section and a de
veloping section) or three sections (i.e. an exposure sec
around rollers also disposed internally of the tank or
chamber.
These internal conveyor belts or blankets suffer from
tion, a separating section and a developing section). In
the same tracking difficulties as the other conveying
the printing section of one form of the apparatus sensi 20 and/or sealing belts of the apparatus.
tised sheet material with an original sheet to be copied
The present invention is concerned with improvements
is fed past an exposure station by means of the moving
in the conveyor belts of apparatus of the kind described
endless conveyor belts, the belts being lapped around a
designed to overcome or_ reduce either or both of the
part of the periphery of a transparent printing cylinder
di?iculties of sealing and tracking as discussed above.
and the movement of the belts carrying the light sensitive 25
The invention provides diazotype or like photocopying
material and the original around the printing cylinder.
apparatus of the kind described characterised in that the
There is usually a plurality of narrow conveyor belts of
belt, or at least one belt when there are more than one,
canvas or other ?exible material spaced apart across the
width of the machine, the belts being taken around ap
is provided with at least one supporting or stiffening rib
or equivalent belt-like member extending longitudinally
propriately disposed rollers.
30 around the belt.
After the exposure of the light sensitive material the
When the conveyor belt is also employed as a sealing
original and exposed material may be separated by hand
belt or blanket to prevent escape of a developing vapour,
or, when there is a separating section, they pass to the
the belt being of substantial width, it preferably has a
separating section, which may comprise suction boxes,
rib or belt-like member as aforesaid, adjacent each side
pick oif ?ngers and conveyor belts of the kind above 35 edge. Likewise when the conveyor belt is of porous ma
indicated, where the exposed material is separated from
terial and serves to permit vapour used for development
the original, the latter being delivered outside the ma
to pass through the belt to the sheet material being car
chine (e.g. on to a tray or the like) while the former is
ried thereby, the belt in this case also being of substan
conveyed to the developing section.
tial width, it preferably has a rib or belt-like member as
The developing section may comprise a developing 40 aforesaid, adjacent each side edge.
tank or chamber in which aqueous ammonia solution is
In the case where, as in a printing or separating sec
vaporised, or to which ammonia vapour is delivered, the
tion, there are several belts (e.g. of- rubber) arranged to
vapours emanating through, for instance, a perforated or
travel alongside one another in spaced apart relation,
porous portion of a wall of the said tank or chamber
each conveyor belt may have a rib or belt-like member
over which the exposed material is traversed by means of 45 as aforesaid, for example, at the centre of the width of
a moving endless belt or blanket, usually of rubber, which
the conveyor belt.
not only causes the material to travel over the perforated
The ribs or belt-like members are preferably integral
or porous wall area, but also provides a seal around the
with or bonded to the conveyor belts but they may be
area‘ and prevents the vapours escaping into the sur
simply held in contact therewith.
~
rounding atmosphere. With such sealing belts or 50
The stiffening effect of the narrow belt-like members
blankets little di?iculty is experienced in effecting sealing
is especially advantageous when they are associated with
transversely across the width of the area, both at the
the sealing belt or blanket of the developing section of
beginning and the end of the perforated or porous area
the apparatus as such relatively rigid members disposed
but it is not always easy to secure adequate sealing along
adjacent to the side edges of the said belt or blanket
the sides, i.e. along the edges of the area in the direction 55 constrain it to lie closely adjacent to and in adequate
of movement of the belt or blanket.
sealing relationship with the surface of the developing
One of the main reasons why this dif?culty in provid
ing adequate sealing along the side edges of the area
arises is due to the ?exibility and length of the sealing
tank or chamber.
Preferably the narrow ribs or belt-like members are
of V section the wider ?at, top surface of which bears
belt or blanket which makes it di?icult to ensure that the 60 against or may be bonded to or formed integrally with,
said belt or blanket lies tightly in sealing relationship
the inner surface of the sealing belt Or blanket adjacent
to each side edge thereof and hold the side edges against
over the entire length thereof.
the surface of the developing tank or chamber.
In addition to the difficulty of ensuring adequate edge
The V-shaped parts of the belts may be disposed in
sealing of the sealing belt or blanket certain di?iculties 65 appropriately shaped slots provided for the purpose in
regarding the correct tracking of the Wide sealing belt or
the sealing belt rollers.
Preferably the inner surfaces of the conveyor belts
blanket and of the narrow conveyor belts used in the
with the tank or chamber at the sides of the area and
other section or sections of the machine may also be
are knurled, the outer surfaces in contact with the de
veloping chamber or tank or with the printing cylinder
Thus in the case of a plurality of narrow endless belts 70 or the like being plain and smooth.
The knurled inner surface of the belts ensures that the
spaced acrossthe width of their supporting and/or driv
encountered in practice.
ing rollers, tracking difficulties are due mainly to the
narrow belt-like members are either held in adequate
3,020,818
3
frictionalcontact with the said belts or that the said nar
row belt-like members may be easily and readily bonded
thereto.
The narrow belts are preferably so dimensioned and
made of such material that the sealing belt or blanket
is held ?rmly against the side edges of the developing
tank or chamber.
Alternatively instead of providing separate belts to hold
4
which the material to be developed is traversed during the
operation of the apparatus, and
FIGURES 4 and 5 show two dilferent arrangements of
diazotype developing apparatus equipped with sealing ar
rangements and internal conveyors according to the inven
tion.
FIG. 6 is a sectional view taken on the line 6—6 of
FIG. 3.
Referring now to the drawings but ?rst more particu
the side edges of‘ the sealing belt or blanket in contact
with the surface of the developing tank or chamber the in 10 larly to FIGURES l and 2 the transparent printing cyl~
inder of a diazotype or like photocopying machine is indi
ner surface, i.e. the surface not in contact with the de
cated at 1, a. source of actinic radiation (not shown)
veloping chamber of the said sealing belt or blanket, may
being disposed interiorly thereof.
be provided with ribs adjacent to each side edge, such ribs
travelling in slots provided for the purpose in the sealing
The printing cylinder 1 extends for substantially the
blanket rollers and being sufficiently robust as to hold the 15 width of the machine and has lapped around a portion
of its periphery the printer section narrow conveyor belts
edges of the sealing blanket against the developing tank
surface along its edges.
one of which is shown at 2 on the drawings.
The conveyor system, which as beforementioned com
prises a plurality of such narrow endless belts, traverses
and which may be rubber covered may be provided bear
ing on the inner surface of the sealing belt or blanket 20 an original to be copied together with the photosensitive
If desired spring pressed rollers, appropriately grooved,
further to assist in holding the said sealing belt closely
in contact with the face of the developing tank.
Such an arrangement is particularly advantageous where
the developing tank is provided with an open face and an
material superposed thereon around the printing cylinder
to effect exposure of the said material.
As shown on the drawing, the belts 2 are lapped around
the printing cylinder 1 by means of rollers 3, 4, 5 and 6
25 the said rollers also extending for substantially the width
of the machine and one of which is a driven roller travers
As a further alternative, the edge protuberances may
internal conveyor unit.
ing the belts 2 ‘around the cylinder 1.
be provided on the surface of the sealing belt or blanket
The rollers 3, 4, 5 and 6 are provided with a plurality
in contact with the developing chamber, the developing
of grooves 7, 8, 9 and Y10 the number of grooves in each
chamber ‘being provided with registering grooves, chan
nels or trackways in which the protuberances are adapted 30 roller corresponding to the number of belts comprising the
conveyor system.
to seat and move.
Each belt 2 comprises an outer fabric surface 11 and
The grooves, channels or trackways provided on the de
an inner knurled or serrated surface 12 of rubber or like
veloping tank surface are preferably disposed outside the
material and each is provided with a narrow belt-like
zone of perforations, the protuberances on the sealing
member 13 of robust construction disposed centrally of
35
belt or blanket seating in the grooves, channels or track
the said belt and bearing on the inner, knurled, surface
ways forming an effective seal to prevent escape of de
thereof.
velopment vapours into the surrounding atmosphere.
The belt-like members 13 are each of V-section the
The protuberances on the belts or bands maybe of any
?at, wider, surface of the V bearing on or being bonded
appropriate shape and may be ‘formed on or attached in
any convenient manner to the said belts or bands, for 40 to the surface 12 of the belt 2, the members riding in the
grooves 7, 8, 9 and 10, and being in driven engagement
instance on the rubber sealing belt or band they may be
with the grooves in the driven roller.
‘moulded thereon during the process of manufacture of the
said belt or band.
The grooves, channels or trackways on or in the rollers
or tank surface may also be of any desired shape and
may for instance be milled out of the metal surfaces or
It will be seen therefore that each belt 2 of the system
is constrained by the belt members 13 and the grooves 7,
8, 9 and 10 provided in the rollers 3, 4, 5 and 6 to follow
a correct track during its movement round the cylinder 1.
Referring now to FIGURE 3, a developing tank or
pressed thereon or alternatively, and ‘particularly in the
chamber is shown at 14 and comprises a closed metallic
case of the developing tank-surface, prefabricated track
member having a perforated surface 15 through which de
ways may be affixed to, for instance by welding, the
50 veloping vapours emanate and come into contact with
outer surface of the perforated wall of the said tank.
material to be developed as it is traversed over the per
In a speci?c example of developing apparatus according
forated surface ‘15 by means of a wide endless moving
to the present invention and described merely by way of
sealing belt or blanket 16.
example two narrow endless belts of approximately 3/a
The belt or blanket 16 is preferably of rubber or rub
inch maximum width and made‘of rubber or other ?exible
material are provided. The belts are-of V-section and of 55 berised fabric having a smooth surface 17 in contact with
approximately 1/4 inch in depth, the V-portion of the
belts being accommodated in grooves provided for the
purpose in the sealing blanket rollers adjacent to their
outer extremities. The belts ride in the grooves and are
driven upon rotation of the sealing blanket rollers.
The invention will 'now be described with reference
to the accompanying drawings which show by way of ex
ample several embodiments of apparatus according to the
said invention.
abnd sealing the perforated surface 15 of the tank or cham
er 14.
The belt or blanket 16 is held in contact with surface 15
by means of guide rollers 18, 19 and 20 and tensioning
roller
21 one of the guide rollers being a driven roller
60
effective to move the belt or blanket 16 over the surface
15 of the developing tank or chamber 14.
It will be seen that by appropriately positioning rollers
18 and 20 it is a relatively easy matter to ensure that the
blanket 16 effectively seals at the upper and lower ends of
65
In the drawings FIGURE 1 shows in section an embodi
the developing chamber 14.
ment of the present invention applied to the printing
In accordance with this invention and to ensure ade
quate sealing of the blanket 16 along the side edges of the
'or exposure section of a diazotype or like photocopying
tank 14 a pair of narrow belt-like members one of which
‘apparatus.
FIGURE 2 shows, in section, one of the conveyor belts 70 is shown at 22 are provided disposed adjacent to the side
edges of the belt, respectively.
used in the embodiment of FIGURE 1,
The belt-like members 22, which are similar to the
FIGURE 3 shows, also in section, an embodiment of
member 13 above, bear on or are formed integrally with
the present invention applied to the sealing belt or blanket
the inner surface 23 of the belt 16, which surface 23 is
of a conventional diazotype apparatus utilizing a develop
ing tank or chamber having a perforated surface over 75 preferably kn'urled,‘and are accommodated in grooves 24,
3,020,818:
6
25 and 26 provided for
20 respectively.
in rollers 18, 19 and
42, 43, 44, 53 and 54 respectively while tensioning rollers
‘
40, 55 and 56 are provided effective to hold the belt 36
The belt~like members 22, in bearing on the inner sur
face of the sealing blanket 16 adjacent to and coextensive
with its side edges, hold the side edge portions of the said
at the desired tension and to ensure that the members
41 are maintained in their slots during movement of the
said belt 36.
blanket 16 ?rmly in sealing relationship with the surfaces
I claim:
of the developing chamber 14 alongside the perforated
'
1. In photocopying apparatus for producing copies on
light sensitive sheet material, a developing section in
surface 15.
Referring now to FIGURE 5 of the drawings, which il
cluding means for applying developer to light sensitive
lustrates a diazotype apparatus of the kind using both in 10 sheet material after exposure, continuous means in the
ternal and external conveyor belts, the developer tank 27
developing section for supporting such sheet material
is provided with a rectangular or other shaped opening 28
during application of the developer and belt conveyor
in its front surface, the said opening 28 being closed or
means for carrying light sensitive sheet material through
substantially closed by an internal conveyor belt 29 of
the developing section, said conveyor means comprising
vapour diffusing material. The conveyor belt 29 passes 15 a ?exible belt and guide and driving means to cause the
around guide rollers 30 and 31 one of which is a driven
belt to travel over said sheet material supporting means
roller.
with the sheets being processed held between the belt and
In addition to the guide rollers 30 and 31 a tensioning
the support means, said belt having longitudinally extend
roller 33 is provided bearing against the inner surface of
ing stiffening ribs for maintaining the belt in ?rm engage
the conveyor belt 29 whereby it may be maintained at a
ment with said sheet material supporting means.
2. Apparatus as claimed in claim 1 in which the ribs
desired appropriate tension.
The conveyor belt 29 is provided adjacent to each of its
longitudinal side edges with belt-like members or p-ro~
tuberant ribs one of which is indicated at 32 on the draw
mg.
are on the face of the belt remote from the supporting
means.
3. Apparatus as claimed in claim 1 in which the driv
25 ing means comprise a driven roller having grooves to
These belt-like members or ribs 32 ride in slots 34 and
35 formed for the purpose in the guide rollers 30 and 31
respectively.
receive said ribs and to embrace the sides thereof in
driving relation.
4. Apparatus as claimed in claim 1 in which the ribs
Disposed over the open front face 28 of the developer
are integral with the belt.
tank 27 is the external sealing belt indicated at 36.
30
5. Apparatus as claimed in claim 4 in which the guide
Belt 36 takes around appropriately disposed rollers 37,
means comprise at least one roller having grooves in
38 and 39 and is provided with a tensioning roller 40 dis
which the ribs are received.
posed against its outer surface.
6. Apparatus as claimed in claim 1 in which the ribs
The belt 36 is provided adjacent to each of its longi
are on the face of the belt adjacent the supporting means
tudinal- side edges with belt-like members or ribs one of 35 and the supporting means have grooves in which the ribs
which is indicated at 41. These belt-like members or ribs
ride in grooves 42, 43 and 44 provided for the purpose in
rollers 37, 38 and 39 respectively as in the previous em
bodiments.
are received.
reference numerals indicate like parts on the drawing, the
sheet material supporting means, and means for pressing
7. Apparatus as claimed in claim 1 and having trans
verse spring-pressed rollers engaging the belt on the face
If desired spring pressed rollers 45 and 46 respectively 40 remote from the sheet material, at the beginning and end
of the developing sections and means underlying the
may be provided bearing against the rear or inner sur
sheet material opposite to the said rollers.
face of the belt 36 to hold it ?rmly in contact with the
8. Apparatus as claimed in claim 1 in which the sur
upper and lower ends of the developer tank 27.
face of the belt remote from the supporting means is
The rollers 45 and 46, which bear on substantially the
knurled.
whole width of the belt 36, are provided with slots 47
9. In photocopying apparatus for producing copies on
and 48 respectively in which the belt-like members or ribs 45
41 ride.
light sensitive sheet material, a developing section includ
The belt 29, as it passes over the aperture 28, is sup
ing means for applying developer to light sensitive sheet
ported on a perforated plate 60 which constrains the
material after exposure, continuous means in the develop
belt to follow the curvature of the tank wall and also per
ing section for supporting such sheet material during ap
mits the ammonia vapour to penetrate through the belt. 50 plication of the developer and belt conveyor means for
In an alternative arrangement both the belt 29 and the
carrying light sensitive sheet material through the devel
plate 60 are impervious and the outer face of the belt 29
oping section, said conveyor means comprising a ?exible
is formed with recesses 01‘ pockets which hold sufficient
belt and guide and driving means to cause the belt to
ammonia gas for development.
travel over said sheet material supporting means with
Referring now to FIGURE 5 which shows a similar ar 55
the sheets to be processed held between the belt and the
rangement to that shown in FIGURE 4 and wherein like
the edges of said belt ?rmly against the sheet material
internal conveyor belt 29, which in this case is made of a
chain mesh material, is disposed within the developer tank ' supporting means to hold sheet material being processed
or chamber but arranged somewhat differently from the 60 tightly against the said sheet material supporting means,
which pressing means comprise narrow support belts
arrangement shown in FIGURE 3.
running in engagement with the edge portions of the
‘In this case the belt 29 in addition to taking around
conveyor belt as it passes over the sheet material sup
guide rollers 30 and 31 also takes around a roller 49, the
porting means and on the face of the belt remote from
narrow belt-like members or ribs 32 coextensive with the
longitudinal side edges of the belt 29 riding in slots 34, 65 the sheet material supporting means.
10. In photocopying apparatus for producing copies
on light sensitive sheet material, a developing section
49 respectively.
comprising a chamber for containing gaseous developer
A tensioning roller ‘33 is also provided.
The external sealing belt 36 having integral with its 70 and having an aperture in one wall, a perforate conveyor
belt within the chamber and substantially covering said
longitudinal side edges the narrow belt-like members or
35 and 50 provided for the purpose in rollers 30, 31 and
ribs 41 is also arranged and disposed somewhat differ
ently from the arrangement shown in FIGURE 3.
As shown, the belt 36 takes around guide rollers 37,
38, 39, 51 and 52 the members 41 riding in the slots 75
aperture, said conveyor belt having ribs along its side
edges and at least one guide roller for said belt having
grooves within which said ribs are received, and an ex
ternal belt which covers said aperture and extends at its
3,020,818
7
side edges over the wall of the chamber along the sides
of the aperture and has ribs along said side edges.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,776,571
Schmicking ___________ _.. Sept. 23, 1930
2,263,960
2,410,611
2,532,184
2,589,748
2,810,572
2,887,942
8
Wilson _____________ __ Nov. 25,
Pratt et al. __________ __ Nov. 5,
Nassimbene _________ _.. Nov. 28,
Trump ______________ __ Mar. 18,
‘Dignan _____________ __ Oct. 22,
Frantz ______________ __ May 26,
1941
1946
1950
1952
1957
1959
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