Improvements in Printing Machines.
Year: 1899

page_text: Improvements in Printing Machines.
We, WILLIAM HENRY DAWSON, of Maple Bank, Printers' Engineer, and JAMES
STOTT, of 7, Ashfield Place, Printers' Engineer, both in Otley, in the County of
York, do hereby declare the nature of this invention to be as follows:-
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--
Our invention has for its object certain improvements in what is known as the
tumbling cylinder" printing machine, by a novel combination of parts so
arranged that a sheet of paper or the like may be fed into grippers on the top
portion of the impression cylinder instead of under as heretofore, and retain
the hold of the sheet beyond one revolution so as to deliver the sheet upon
switches, which guide the leading edge of the sheet into suitably mounted
rollers, which nip and draw the sheet off the cylinder, and convey it upon tapes
or any suitable sheet carrying mechanism into a second pair of nipping rollers,
which deliver the sheet upon a suitably mounted board. The second pair of
nipping rollers may be stopped at a desired time by suitable means, with the
latter portion of the sheet in the nip of the rollers, so that the sheet becomes
steady before being finally delivered, or the sheet may be delivered by any other
suitably constructed mechanism.
Also to so arrange the gripping device thereon that instead of the grippers
being dropped directly on the sheet by the operator, they are left in charge of a
fixed rest, suitably shaped, so that the said grippers will close upon the sheet at
the proper time and obtain perfect register.
Also to so arrange the raising and lowering of the cylinder, that when at its
lowest point it is locked by suitable means, to prevent yielding or knocking on
the impression, as is common in this class of machine.
We accomplish our object by mounting a cylinder (provided with grippers,
long fingers, and top feeding board) in suitably constructed bearings so as to rise
and fall over a reciprocating type bed, to which the said cylinder is geared by
means of wheels and racks in the ordinary manner. We give to the table a
longer travel than the circumference of the cylinder, sufficient for the cylinder to
carry the sheet beyond one revolution, so as to deliver the sheet upon switches
in the manner above described. When the grippers give up the sheet at the
desired point, the long fingers which are under the sheet rise slightly to lift the
leading edge of the sheet upon the switches. To force the sheet over the said
switches into the nip of the rollers we provide a shaft with bowls, suitably
mounted and resting upon the periphery of the cylinder; or in lieu of rollers
any suitably constructed delivery apparatus may be employed.
When the cylinder has made its full revolution in delivering the sheet, the
said shaft with bowls is raised to give freedom for the sheet to be drawn off by
the nipping rollers when the cylinder is travelling in the opposite direction.
The raising and lowering of the cylinder is accomplished by mounting it in
eccentrics in the ordinary manner. To the said eccentrics we attach springs
which rest upon the frame to bear up the weight of the cylinder and shaft,

page_text: keeping all play which may arise through wear in one direction so as to secure
a solid impression
By this means a better class of work is obtained at a higher rate of speed, and
a better register is obtained. The machine is also cheaper of construction, more
accessible to the attendant, and occupies less space than heretofore.
Motod this 2nd day of Santamben 1900
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicants.
Improvements in Printing Machines.
We, WILLIAM HENRY DAWSON, of Maple Bank, and JAMES SroTr, of 7, Ashfield
Place, both in Otley, in the County of York, Printers' Engineers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
Our invention has for its object certain improvements in what is known as
the tumbling cylinder printing machine, by a novel combination of parts 80
arranged that a sheet of paper or the like may be fed into grippers on the top
portion of the reciprocating impression cylinder instead of under as heretofore,
the said grippers retaining their hold upon the sheet beyond one or more revolu-
tions (and in order that this may be done, the table has a longer travel than the
circumference of the cylinder) so as to deliver the sheet printed side up upon
switches or the like.
The said switches or the like guide the leading edge of the sheet into suitably
mounted rollers, which nip and draw the sheet off the cylinder and convey it upon
tapes (or other suitable sheet carrying mechanism) to any desired position of
delivery.
Also we so arrange the gripping device thereon that, instead of the grippers
being dropped directly on the sheet by the operator, they are left in charge of a
fixed rest, suitably shaped, so that the said grippers will close upon the sheet at
the proper time and obtain perfect register.
Also we so arrange the raising and lowering of the cylinder, that when at its
lowest point it is locked by suitable means, to prevent vielding or knocking on
the impression, as has heretofore been common in this class of machine.
DESCRIPTION OF DRAWINGS.
Fig. 1 is an end view showing the cylinder ready for receiving a sheet.
Fig. 2 is an end view showing the cylinder delivering the sheet on to switches.
Fig. 3 is a partial side elevation of machine, showing mechanism for operating
the inclines.
Fig. 4 is an enlarged detail of the cam 1 (Fig. 3) for operating the incline H.
Similar letters and numbers of reference are employed to indicate similar
parts in each of the figures.
We accomplish our object by mounting a cylinder A (Fig. 2) geared by
wheel B into rack C, which rack is secured to the type bed D. The raid
cylinder A is provided with grippers E on shaft F, which shaft F carries a double
ended lever with bowls at each end, one marked G to operate for taking the
sheet, and the other marked I for opening the grippers. The bowl G is operated
by the incline H suitably shaped and pivotted at H', this being connected and

page_text: operate 1 (see Fig. 3) by a cam and lever arrangement 1, 1, 1, 1, all suitably pivotted
to give it its desired motion; the bowl I for opening the grippers is operated by
the incline J, this being also suitably connected and operated (see Fig. 3) by a
cam and lever arrangement 2, 2, 2, 2, all suitably pivotted to give it its desired
motion. The cylinder is also provided with long fingers K on shaft L, together
with lever and bowl M, the bowls I and M being both operated by the incline J.
A shaft N with levers carrying bowls O is provided, also suitably mounted bowls
or rollers P, Q, and a feeding board R with gauges S.
In operation the cylinder A (as shown in Fig. 1) is at the limit of its travel
towards the feeding board, ready for receiving a sheet from the board R after
being fed to the gauges S. When the cylinder has reversed and travelled a short
distance, the bowl G runs down the incline H after being partially lowered by
cam 1, (Fig. 3), allowing the grippers E to close upon the sheet.
The course is now clear for the grippers E to retain their hold upon the
sheet until the cylinder has made more than a revolution on a machine con-
structed for printing one colour (and more than two revolutions on a machine
constructed for printing two colours), when the bowl O descends upon the peri-
phery of the cylinder: at this point the grippers E and long fingers K rise, by
being operated upon by the incline J (see Fig. 2), the grippers giving up the
sheet, and the long fingers lifting the leading edge of the sheet upon the
switches T.
The cylinder still continues its course until the sheet is forced by means of
bowl O resting upon the periphery of the cylinder, into the nip of the bowls P
and roller Q (or other suitable nipping apparatus) which are timed to receive it,
after which the bowl O is raised to allow the bowls P and roller Q to draw off
the sheet, which can then be carried away by any suitably constructed sheet
carrying mechanism and delivered in any convenient position by any suitably
constructed delivery apparatus.
The cylinder now reverses and makes its travel back again, when the incline J
is moved back, and the incline H is raised, in order to open the grippers to
receive a sheet as beforedescribed. Fig. 4 shows the position of the operating
cam 1 when the incline H is at rest and the grippers E are closing on the sheet.
The raising and lowering of the cylinder is accomplished by mounting it in
eccentrics in the ordinary manner. To the said eccentrics we attach springs U
(Fig. 3) which rest upon the framework of machine; these springs U are secured
to the eccentrics by means of a rod V which passes through the spring U and
the framework, allowing the spring to rest upon the said frame. The rod V is
pivotted to the eccentric at W, so that when in operation (the eccentric being at
its lowest point and the cylinder on the impression) the springs are compressed.
By this means any play which may arise through wear is all drawn in one
direction and is not felt on the impression.
By this means a better class of work is obtained at a higher rate of speed,
and a better register is obtained. The sheet is delivered printed side up which
prevents smearing and cracking of sheets. The machine is also cheaper of con-
struction more accessible to the attendant, and occupies less space than heretofore.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. In a printing machine the employment of a cylinder provided with grippers
and geared to a reciprocating type table so that they reciprocate together, the
table having a longer travel than the circumference of the said cylinder, for the
purpose of taking a sheet from the top portion of the cylinder; and after printing
in one or two colours delivering it at a point beyond the feeding line, so as to
deliver it printed side up, substantially as described and as illustrated in the
accompanying drawings.
2. In a printing machine the combination with a reciprocating cylinder, of an

page_text: incline H which is caused to rest by means of a suitably shaped cam when the
grippers are about to close upon the sheet, substantially as described and as
illustrated in the accompanying drawings.
3. In a printing machine the combination, with an eccentric used for raising
and lowering the cylinder, of the spring U and its attachments, substantially as
and for the purpose described, and as illustrated in the accompanying drawings.
4. In a printing machine the combination of the cylinder A, the table 1)
having a longer travel than the circumference of the said cylinder, the switches T,
the shaft N with bowls O, the bowls P and roller Q, and the feed-board R, all
arranged and operated substantially as and for the purposes shown and described.
Dated this 5th day of May 1900.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicants.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicants.