Improvements in Machines for Setting off on Sheets or Slabs of Glass and other Brittle Substances, Impressions taken from Lithographic Stones, Engraved Blocks, and the like.
Year: 1899

page_text: Date of Application, 11th Dec., 1899
Complete Specification Left, 11th Sept., 1900-Accepted. 24th Nov
1000
PROVISIONAL SPECIFICATION.
Improvements in Machines for Setting off on Sheets or Slabs of Glass
and other Brittle Substances, Impressions taken from Lithographic
Stones, Engraved Blocks, and the like.
I, COSMAN HENRY COHEN, of No. 3, Princelet Street, in the County of London,
Printer, do hereby declare the nature of this invention to be as follows:-
My invention relates to certain machines for setting off on sheets or slabs of
glass and other brittle substances impressions taken from lithographic stones
5 engraved blocks and the like the kind of machines to which my said inven-
tion is applicable being such as embody the essential features of construction
described in the Specification of Letters Patent No. 21903 granted to me jointly
with Samuel Mark and bearing date the 18th day of November 1895 that is to say
machines so constructed that the article or articles from which the impression is
to be taken and that or those on which it is to be set off are stationary and
in which the means for taking the impression and setting it off consists of a
rotatory cylinder mounted in a travelling carriage which is arranged to pass
over both or all of the said articles.
In working with machines embodying the said features of construction I have
found that where sheets or slabs of glass or brittle material which are not of
uniform thickness at all parts have to be dealt with the inequalities of thick-
ness cause imperfection of the setting off in consequence of the pressure of
the surface of the cylinder being less on some parts of the surfaces on which
the set off is received than on others. I have also found that where a pad of
elastic or yielding material is placed between such sheets of glass or slabs and
the supporting table of the machine for the purpose of correcting the said
imperfection the said sheets or slabs occasionally break under the pressure of
the cylinder owing to the said pad yielding only at and near the part beneath
that portion of the sheet or slab which for the time being is in contact with
the setting off surface of the cylinder.
Now the object of my said invention is to admit of use of the aforesaid
machines for the purpose of setting off on sheets or slabs of glass or other
brittle material of unequal thickness at different parts without risk of the
foresaid consequences.
For convenience of reference in the following description of my invention I
vill term the aforesaid sheets of brittle material "the work."
According to my said invention I provide for support of the work in the
achine in such a manner that while the setting off cylinder is acting on the
ront or surface of the work which is required to receive the set off resistance to the
ressure of the cylinder is produced on the back or reverse surface of the work
nly at the part immediately beneath that which for the time being is in
ontact with the said cylinder and to insure equality of the pressure of the
linder at all points of the part of the work in contact therewith notwithstand-
g inequality in thickness of the said part I combine an elastic or yielding
ement with the means by which the said pressure is resisted.
Although the foregoing statement fully discloses the nature or essential
atures of my said invention I will for the purpose of illustration describe
[Price 8d1

page_text: specific arrangement embodying the same premising that my said invention is
not restricted to the said arrangement the aforesaid essential features being
capable of embodiment otherwise.
According to the said arrangement I provide for support of the work in the
aforesaid machines as follows;-Above the "feed table" which is at the part
of the machine where the setting off takes place I extend an apron or sheet of
flexible material (hereinafter termed the feed apron) horizontally between two
rods or bars mounted at some distance apart in the machine and transversely
thereto one of which rods or bars is capable of rotating and is furnished with
a ratchet and pawl or ratchets and pawls by means of which tension of the
apron to the required degree may be produced. This feed apron constitutes the
support on which the work is placed for receiving the set off from the setting
off cylinder of the machine. Under the feed apron I mount a roller (hereinafter
termed the supporting roller) transversely in the machine in spring bearings
.supported on or in slides carried by the feed table of the machine which roller
is covered or coated with elastic or yielding material the surface of the covering
of the roller being in contact with the underside of the feed apron. To the
carriage of the setting off cylinder I connect jointed spring catches and by
means of inclines secured to suitable parts of the machine I provide for auto-
matic engagement of the said catches with the slides of the supporting roller
and disengagement of the said catches from the said slides at such portions of
the traverse of the cylinder carriage that while the setting off
cvlinder is travelling and rotating above the feed apron the sup-
porting roller is travelling under it the relative positions of the said
cylinder and roller while both are so travelling being such that their axes are
in one and the same vertical plane. When during action of the machine the
setting off cylinder is passing over the work to produce the set off contact
between the setting off surface of the cylinder and the work is maintained by
the supporting roller under the feed apron which roller supports the work only
at the part which is actually in contact with the said cylinder the other parts
being supported only by the feed apron. The work is therefore not subjected
during the setting off to any strain liable to produce fracture. The spring
bearings of the supporting roller permit it to approach and recede from the
setting off cylinder and to take an angular position relatively thereto in a ver-
tical plane and thus insure equality of pressure of the acting part of the said
cylinder at all points notwithstanding irregularities of thickness at different parts
of the work.
I provide for proper "lay" of the work on the feed apron by means of a
straight edge bar having a projection forming a right angle with one of its edges
and having slots at its ends which bar I place on the feed apron in the position
necessary for determining the required lay of the work and secure it in such
position by passing screws through the aforesaid slots into the feed table or
other fixed part of the machine. The slots at the ends of the bar admit of its
adjustment for variation of the lay when requisite.
Dated this Eleventh day of December 1899.
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Machines for Setting off on Sheets or Slabs of Glass
and other Brittle Substances, Impressions taken from Lithographic
Stones, Engraved Blocks, and the like.
I, COSMAN HENRY COHEN, of No. 3, Princelet Street, in the County of London,
Printer, do hereby declare the nature of this invention and in what manner the
Improvements in Machines for Setting off on Sheets or Slabs of Glass
and other Brittle Substances, Impressions taken from Lithographic
Stones, Engraved Blocks, and the like.
I, COSMAN HENRY COHEN, of No. 3, Princelet Street, in the County of London,
Printer, do hereby declare the nature of this invention and in what manner the

page_text: same is to be performed to be particularly described and ascertained in and by
the following statement:-
My invention relates to certain machines for setting off on sheets or slabs of
glass and other brittle substances impressions taken from lithographic stones
5 engraved blocks and the like the kind of machines to which my said inven-
tion is applicable being such as embody the essential features of construction
described in the Specification of Letters Patent No. 21903 granted to me jointly
with Samuel Mark and bearing date the 18th day of November 1895 that is to say
machines so constructed that the article or articles from which the impression is
to be taken and that or those on which it is to be set off are stationary and
in which the means for taking the impression, and setting it off consists of a
rotatory cylinder mounted in a carriage capable of reciprocatory motion by which
the said cylinder is carried to and fro over both or all of the said articles.
In working with machines embodying the said features of construction I have
found that where sheets or slabs of glass or brittle material which are not of
uniform thickness at all parts have to be dealt with the inequalities of thick-
ness cause imperfection of the setting off in consequence of the pressure of
the surface of the cylinder being less on some parts of the surfaces on which
the set off is received than on others. I have also found that where a pad of
elastic or yielding material is placed between such sheets or slabs of glass and
the supporting table of the machine for the purpose of correcting the said
imperfection the said sheets or slabs occasionally break under the pressure of
the cylinder owing to the said pad yielding only at and near the part beneath
that portion of the sheet or slab which for the time being is in contact with
the setting off surface of the cylinder.
Now the object of my said invention is to admit of use of the aforesaid
machines for the purpose of setting off on sheets or slabs of glass or other
brittle material of unequal thickness at different parts without risk of the
aforesaid consequences.
For convenience of reference in the following description of my invention I
will term the aforesaid sheets of brittle material "the work" and the part of
the machine on which the work has heretofore been placed for receiving the
set off the "feed table" as in the aforesaid specification.
According to my said invention I provide for support of the work in the
machine in such a manner that while the setting off cylinder is acting on the
front or surface of the work which is required to receive the set off resistance to the
pressure of the cylinder is produced on the back or reverse surface of the work
only at the part immediately beneath that which for the time being is in
contact with the said cylinder and to insure equality of the pressure of the
ylinder at all points of the part of the work in contact therewith notwithstand-
ng inequality in thickness of the said part I combine an elastic or yielding
lement with the means by which the said pressure is resisted.
The accompanying drawings illustrate a convenient arrangement of parts
mbodying my aforesaid invention the nature of which is herein before described.
Figure 1 of the said drawings is a plan view or certain portions of the afore-
aid patented machine the said portions being principally the feed table and
he setting off cylinder which latter is shown at the part of the machine where
he damping table (not illustrated) is situated. The said figure also illustrates
he provision for support of the work according to my present invention the
me being shown in connection with the feed table. Figure 2 is a section
ken on the line A A Figure 1 showing the setting off cylinder in the same
osition relatively to the feed table as in Figure 1. Figure 3 is a section
ken on the line B B Figure 1 but showing the setting off cylinder in its
vance traverse over the feed table. Figure 4 is a detail view showing in
ction (taken on the line C C Figure 1) a portion of the mechanism whereby
sistance to the pressure of the setting off cylinder is produced as herein before
ated on the back or reverse surface of the work.

page_text: In the following description the several parts of the accompanying drawings
are referred to by the letters and figures marked thereon. In all the figures of
the accompanying drawings the same letters and figures of reference indicate
the same parts and such of the parts as are the same as those of the machine
illustrated in the drawings of the Specification of the aforesaid Letters Patent
and are hereinafter referred to are marked with letters and figures of reference
the same as those on corresponding parts of the drawings of the said specification
The setting off
the said parts being the following, viz.;-The feed table e.
cylinder and its shaft and toothed wheels pq. The frames 23 constituting
the carriage supporting the said cylinder. Portions of the side frames of the
machine constituting the slides a a on which the cylinder carriage travels and
the racks with which the toothed wheels ? gear.
The aforesaid arrangement which embodies the present invention and con-
stitutes the support for the work in the machine consists mainly of the following
as rubber printing
parts: An apron or sheet 6 of the material known
or
blanket "
above
other suitable flexible material extended
the feed
table. A roller c¹ covered or coated with elastic or yielding material mounted
beneath the said apron in bearings carried by sliding supports and rest-
ing on springs as shown in Figure 4 and means for causing the said roller
to travel beneath the apron while the setting off cylinder is travelling above it
during working of the machine.
The apron passes over bars 62 63 supported by brackets d¹ dɩ d² d² d³ d³
affixed to the said table by screws and is secured at one edge to the bar by
a clamping bar band at the opposite edge to a roller f working in bearings
formed on the brackets and is kept in tension as required by engagement
of a pawl f with a ratchet wheel f³ on the said roller f'. The sliding sup-
ports of the bearings of the roller c¹ work between guides g g secured to
the feed table e and are connected together by rods h¹ 2 and nuts h³ ³. The
travelling of the roller c beneath the apron b¹ while the cylinder is travelling
above it is provided for as follows:-Below and at or near each end of the
cylinder is a pawl which is normally held by a spring against a stop k³
and has a projecting lug which pawls are jointed to bars carried
by rods m m secured at their ends to the supports of the setting off cylinder i
and on the sides of the sliding supports of the bearings of the roller c
are secured plates bearing lugs n¹ n¹ n² n² standing in the paths of motion of
the lugs on the pawls k¹ and secured to the guides g g on the table e
in the paths of motion of the rounded noses of the said pawls, are inclines o¹ o¹
022 the effect of which inclines is to cause the lugs on the pawls k¹ k
to engage with and to be disengaged from the lugs on the sliding supports c4 c
of the pressure resisting roller c as required the axes of the setting off cylinder i
and of the said roller being in the same vertical plane or approximately so
when the pawls are engaged with the lugs n2 n2 and the cylinder i
is advancing over the work to produce the set off. For the purpose of checking
free motion of the sliding supports when released from engagement with
the pawls springs ss ss2 are secured in the path of motion of the
rods connecting the said sliding supports.
The provision for insuring accurate "lay" of the work with the arrangement
herein before described consists of a bar t¹ having a projection t forming a right
angle with one of its edges and having slots at its end parts in which slots
are engaged clamping screws which are also engaged with slots in bars t
secured to the brackets dddd. The said slots and screws admit of adjust-
ment of the said bar t¹ for variation of the lay when requisite.
u represents a tile placed on the feed apron in position to receive a set off
from the cylinder i.
The action of the arrangement herein before described is as follows:-
When during working of the machine the setting off cylinder i has advanced
to the feed apron b¹ the pawls kk are raised by the inclines o¹ o¹ and on the

page_text: sard pawis descending after passing the said inclines the lugs on the said
pawls pass between the lugs n¹ n¹ n² n² on the sliding supports of the
roller which during the further advance of the cylinder carriage 12 23 are
caused to move forward with it by the bearing of the lugs against the
5 lugs n n the axes of the roller c¹ and the cylinder i while the sliding sup-
ports care thus moved forward being in the same vertical plane as is shown in
Figure 3. Thus while the setting off cylinder i is passing over the work to
produce the set off contact of the work with the setting off surface of the said
cylinder is maintained by the pressure resisting roller c¹ under the feed apron b¹
which roller supports the work or resists the pressure thereon of the setting
off cylinder only at the part which is actually in contact with the setting off
cylinder the other parts being supported only by the said feed apron b¹. The
work therefore is not subjected during, the setting off to any strain liable to
produce fracture. The springs c5c5beneath the bearings of the pressure resist-
ing roller together with the covering 2 of the said roller constitute the afore-
said elastic or yielding element whereby the said roller is permitted to approach
and recede from the setting off cylinder i and to take an angular position rela-
tively thereto in a vertical plane and equality or practical equality of pressure
of the acting part of the said cylinder at all points is provided for notwith-
standing irregularities of thickness at different parts of the work. After the set
off has been produced the sliding supports of the roller care freed from the
cylinder carriage by rise of the pawls kk over the inclines 202 and the
said supports and roller come to rest without shock their momentum being
absorbed by compression of the springs $2 $2 by the rod h².
of the cylinder carriage 22 23 after it has reached the end of its forward stroke
On the reverse motion
the lugs on the pawls again enter between the lugs n¹ n¹ na na
on the sliding supports of the roller c¹ and by bearing against
the lugs n n draw the said roller backward until disengagement of the said
lugs is produced by the inclines of o¹ when continued backward motion of
the said roller and its supports is arrested by the springs s¹s which act as
described with reference to the springs s2 s2.the position of the said roller and
its supports when so arrested being as shown in Figure 2.
To guard against misapprehension respecting the scope of my claims which are
hereinafter stated I would observe that my said claims are not restricted to the
precise arrangement of parts herein before described and illustrated in the accom-
panying drawings my said invention being susceptible of being carried into
effect by means of other arrangements constituting embodiments of the novel
features of my said invention which are set out in the statement of the nature
thereof herein before contained.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that I
claim :-
―:
First: The combination with machines of the kind hereinbefore referred to
of means for causing resistance to the pressure of the setting off cylinder only
at that part of the work where at any given time the said cylinder is acting sub-
tantially as hereinbefore described.
Secondly:-The combination with machines of the kind herein before referred
o of a flexible support for the work substantially as and for the purpose herein-
efore described.
Thirdly: The means hereinbefore described for resisting the pressure of the
etting off cylinder on the work in machines of the kind hereinbefore referred to
hat is to say a rotatory roller mounted in sliding supports beneath the work the
aid sliding supports and the setting off cylinder having combined with them
echanism whereby they are caused to travel together during the setting off
ction of the machine substantially as and for the purpose herein before described.
Fourthly Means for resisting the pressure of the setting off cylinder on
:

page_text: the work in machines of the kind herein before referred to consisting essentially
of a roller which is caused to travel beneath the work while the setting off
cylinder is passing over it the axes of the said roller and cylinder while both
are so travelling during production of the set off being in the same vertical plane
or approximately so substantially as herein before described.
Fifthly: The mechanism herein before described for causing simultaneous
motion of the setting off cylinder and the pressure resisting roller while the
former is passing over the work that is to say the combination with the carriage
of the setting off cylinder of pawls and the arrangement in their paths of motion
of inclines whereby the said pawls are caused or permitted to engage with and
are disengaged from the sliding supports of the pressure resisting roller sub-
stantially as herein before described.
Dated this Tenth day of September 1900.
W. T. WHITEMAN,
Agent for the Applicant.