Improvements in or connected with Lithographic and Letterpress Printing Machines.
Year: 1896

page_text: Date of Application, 21st July, 1896
Complete Specification Left, 21st Apr., 1897-Accepted, 5th June, 1897
PROVISIONAL.
TUN
Improvements in or connected with Lithographic and Letterpress
Printing Machines.
We, CHARLES POLLARL, and GEORGE BRAYSHAW, both of the Firm of
George Mann and Company, Elland Road Works, Leeds, in the County of York,
Printing Machine Makers, do hereby declare the nature of this invention, to be
as follows:-
The object of our invention, is to construct printing machines in such a manner
that the table may be driven at a slow speed during the printing operation whilst
on its return travel it may be run at a greater speed, thus increasing the output
without impairing the quality of the work.
According to our invention, we mount two different sized pinions on the driving
shaft of the machine, and within the frame and in line with the pinions above
referred to are situated two large spur wheels, which are mounted on shafts having
a common centre. The larger spur wheel is in a line with the smaller pinion
before referred to, and the smaller spur wheel is in a line with the larger pinion;
and each of these spur wheels have half or other suitable portion of their teeth
cut away, in such a manner that one spur wheel only is in gear with its pinion at
one and the same time. An extra tooth is fitted on the side of each of the spur
wheels, and the said teeth engage with suitable projections or extra teeth situated
on the sides of the pinions. A connecting rod is attached between the two spur
wheels, and the opposite end of the said connecting rod carries the rolling wheel
for actuating the table of the machine.
On the driving shaft being set in motion the small pinion gears with the larger
spur wheel, thus moving the connecting rod slowly and giving the table a slow
travel during which the printing operation is performed, and on the connecting rod
arriving at the end of its stroke the pinion comes to the end of the teeth on the
spur wheel and the extra teeth continue the motion, bringing the larger pinion into
gear with the smaller spur wheel. This change withdraws the connecting rod at
a swifter speed and gives the table a swift return, and on arriving at the end of its
travel the extra teeth change the gear to the small pinion and the large spur
wheel, and the operation is repeated.
In some instances we prefer to make the connecting rod in two parts, two
parallel rods heing jointed to the spur wheels and being connected to a pivotted
crosshead which carries the rolling wheel for actuating the table.
Instead of forming the teeth of the racks for communicating motion to the
cylinder, all of the same pitch, we enlarge the pitch at the starting ends of same.
This enables us to employ teeth of larger size and pitch, thus making the racks
stronger where the strain is greatest. The cylinder wheels are provided with teeth
of different size to enable them to gear with the racks carrying the different
sized teeth.
1
T
1000
BREWER & SON,
London and Leeds, Agents for the Applicants.

page_text: SOME TINTE MULTICATION.
Improvements in or connected with Lithographic and Letterpress
Printing Machines.
We, CHARLES POLLARD, and GEORGE BRAYSHAW, both of the Firm of
George Mann and Company, Elland Road Works, Leeds, in the County of York,
Printing Machine Makers, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The object of our invention, is to construct printing machines in such a manner
that the table may be driven at a slow speed during the printing operation, whilst
on its return travel it may be run at a greater speed, thus increasing the output
without impairing the quality of the work.
In order that our invention may be clearly understood we will proccel to
describe same with reference to the accompanying drawings, in which similar
letters refer to like parts in all the figures:-
Figure is a plan, and Figure 2 is a sectional side elevation, of a machine
constructed according to our invention, and Figures 3 and 4 are respectively a
plan and side elevation shewing a modification of same.
According to our invention, A. is a small pinion, and B is a large pinion, both of
which are mounted on a driving shaft C. The driving shaft C is mounted in the
frame D of the machine, and E and F are two shafts which are also mounted in
the frame D and their inner ends carry the spur wheels G and H. The spur
wheel G is in line with the pinion A, and the spur wheel H is in line with
the pinion B, and the wheels G and H have half or other suitable portion
of their teeth cut away, in such a manner that one spur wheel only is in
gear with its pinion at one and the same time. J is an extra tooth which is
attached to the side of the spur wheel H, and K, K are teeth which are
situated on the side of the pinion B. L is an extra tooth which is attached to the
side of the spur wheel G, and M, M are teeth which are situated on the side of
the pinion A. N is a einnecting rod, which is attached between the two spur
wheels, and the opposite end of the said connecting rod carries the rolling wheel
for actuating the table of the machine.
On the driving shaft being set in motion, the pinion A gears with the spur
wheel G, thus moving the connecting rod N slowly and giving the table a slow
travel during which the printing operation is performed, and on the rod N arriving
at the end of its stroke the pinion A comes to the end of the teeth of the wheel G
and the extra teeth J and K continue the motion, bringing the pinion B into gear
with the spur wheel H. This change withdraws the connecting rod at a swifter
speed and gives the table a quick return, and on arriving at the end of its travel
the teeth L and M change the gear to the slow speed, aud the operation is
repeated.
It will be seen that the extra teeth L and M, and Jaal K, take the strain of
the increase or decrease of the speed, but we have found that it may be best in
some cases where heavy machinery is employed to divide the strain over a greater
space, and for this purpose we employ the modificatior shewn at Figures 3 and 4.
As seen in these figures, a toothed plate P is attached the spur wheel H at the
point of change, and a toothed cam R is provided ou the shaft C. The to thed
plate P and can R permit the change of speed of the spur wheels to be made
gradually instead of quickly as is the case with tae single change teeth, thus
relieving the wheels from considerable strain.
In order to provide for the strain which takes place at the starting end between

page_text: the cylinder and the racks which actuate same, we enlarge the size and pitch of the
teeth at the said starting end, thus making them stronger where the strain is
greatest. The cylinder wheels which gear with the said racks are also provided
with teeth of a corresponding variation in size and pitch, thus also strengthening
the wheels in the same manner as the racks.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In lithographic and letter-press printing machines, the pinions A and B, in
combination with the spur wheels G and H, substantially as and for the purposes
set forth.
2. In lithographic and letter-press printing machines, the pinions A and B,
shafts E and F, spur wheels G and H, and extra teeth L, M, J and K, substantially
as and for the purposes set forth.
3. In lithographic and letter-press printing machines, the pinions A and B, and
the spur wheels G and H, in combination with the toothed plate and cam R,
substantially as and for the purposes set forth.
4. In lithographic and letter-press printing machines, the enlarging of the teeth
at the starting end of the racks, together with those of the cylinder wheels,
substantially as and for the purposes set forth.
5. The general arrangement, construction and combination of the various parts
forming our improvements in or connected with lithographic and letter-press
printing machines, substantially as and for the purposes set forth, together with
any mere modification or modifications thereof.
Dated this 21st dor of Aneil 1807
BREWER & SON,
London and Leeds, Agents for the Applicants.