Year: 1897

page_text: Date of Application, 11th June, 1897
L'amplate Specifination Loft 11th Man 1900 teenstod
11th lune
1900
I, EDWARD THOMAS CLEATHERO, of 16, Tollington Place, London, N., Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to that type of printing machines in which the type forme
is reciprocated for the purpose of inking and for conveying the impression from
the type, and to means whereby such reciprocation may be effected in a simple
and effective manner and with a minimum of working parts, so that but small
space is required by the gear in operation while the several disadvantages of the
means usually in vogue for this purpose are obviated.
My invention consists in effecting the reciprocation of the coflin plate or bed by
means of a rotating tooth wheel or wheels in gear with a rack or racks preferably
upon the underside of the coffin plate or bed, such topthed wheel or wheels being
alternately rotated in the one and the other direction by means of mutilated or
segmental tooth wheels which rotate uniformly in opposite directions and have
their respective teeth and mutilated parts opposed, and my invention further
consists in the provision of means such as are hereafter described for effecting the
rotation of the operating shaft in one or other direction positively in such a manner
as to preclude possibility of breakage of the teeth upon the stress imposed at the
initial movement.
In carrying my invention into effect in the application of my invention to an
ordinary cylinder printing machine I provide a counter shaft suitably disposed to
which motion is taken from a line of shafting in the usual way, and I gear this
counter shaft to a shaft situated preferably at or about the centre of the frame
beneath the cylinder, such shaft being in gear with another shaft to which the
same circular movement is communicated, so that each shaft moves synchronously.
Upon each of these shafts are mounted mutilated or segmental toothed wheels
having their mutilated parts so disposed in relation to a pinion provided upon an
operating shaft which is suitably disposed for the purpose that motion shall be
communicated to such shaft alternately as the toothed segmental part of the
respective wheels engages with the said pinion, motion being thereby produced
alternately in opposite directions, which motion by means of a toothed wheel of
determined size and pitch of teeth mounted upon the operating shaft, produces the
reciprocation of the coffin plate or bed alternately in opposite directions.
It will be readily understood that in the operation of the machine a great stress
will be imposed upon the teeth of the engaging wheels at the commencement of the
alternating movements, and for reducing this stress and for the prevention of
possible fracture of the engaging teeth, supplementary stops or teeth are provided
which may be capable of adjustment or may be integrally provided upon the
mutilated toothed wheels, such supplementary teeth or stops engaging with compli-
mentary striking surfaces upon the operating shaft, which may be integrally
provided upon the pinion also mounted thereon, so that the initial movement

page_text: in each direction shall be communicated in a measure by means of such supple-
mentary teeth, and strain or fracture precluded.
It will be obvious that the gear may be mounted and arranged in any manner
and to suit any particular requirement of design without departing from the
essential features of the invention, and that motion may be conimunicated to the
cylinder in the usual manner by means of a rack or racks in parallel, gearing with
a toothed rim or rims of the impression cylinder or the motion of the cylinder may
be directly derived from the operating spindle without the use of a supplementary
rack for that purpose.
It is further obvious that for the convenience of design the gear may be
arranged at any part of the frame of the machine and the size and pitch of the
engaging wheels may be so determined as to effect the alternate reciprocation
required for the purposes of the inking of the type and conveying the impression.
n1141 dose of Tuno 1807
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements relating to Printing Machines.
I, ERWARD THOMAS CLEATHERO, late of No. 16, Tollington Place, in the County
of Middlesex, but now of The Hollies, Barrington Road, Altrincham, in the
County of Chester, Engineer, 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 present invention relates to improvements in the mechanism by which there
is imparted to the bed or coffin plate of a printing machine upon which lies the
forme, a reciprocating linear motion proper for the travel of that forme with
respect to the inking roller, to the impression cylinder, and to the taking away
mechanism. It includes an improved combination of mutilated gear wheels or
sectors; a gear wheel driven by them alternately and in alternate directions; a
single rack on the bed or coffin plate, engaged by the said gear; means for
preventing the excess strain falling upon the leading teeth of the mutilated gear
sectors; and means for preventing the driven pinion stopping prematurely.
Referring to the accompanying drawings which are to be taken as
specification and read therewith:-
part of this
Figure 1 is a side elevation of the invention and the adjacent portion of a
printing machine, omitting the fly wheel and fast and loose pulleys:
Figure 2 is a sectional longitudinal elevation taken along the line 2-2 of
Figures 3 and 4:
Figure 3 is a sectional end elevation including the fly wheel and fast and loose
pulleys, but omitting the impression cylinder and its driving gear; and
Figure 4 is a plan of Figure 3 omitting the impression cylinder and the bed.
A is the frame of the machine; B, the impression cylinder; C, the bed or
coffin plate; D, D¹ the fast and loose pulleys; E, the fly wheel; and F its shaft.
G is a spur pinion fast on the shaft F. H, I, are a pair of spur wheels fast
respectively upon shafts h, i, turning in suitable bearings in the frame A. These
two spur wheels, H, I, are of the same diameter, and gear with each other. Their
motion is derived from the pinion G which engages with one of them.

page_text: J is a spur wheel driven by the spur wheel I and driving the cylinder B by
engaging with a spur pinion K fast on the axis thereof.
L, M, are a pair of spur wheels mutilated over about two thirds of their
peripheries. These wheels are fast upon the shafts h, i, respectively, with their
toothed surfaces on opposite sides of their respective shafts. N is the shaft by
which the bed C is driven. It is mounted to turn in suitable bearings in the
machine frame A equidistantly of the two shafts h, i. O is a spur pinion fast upon
it. It receives its motion from the mutilated wheels L, M, alternately, and the
respective sizes and positions of their shafts h, i, and N, are regulated accordingly.
P is a spur wheel likewise fast upon the shaft N and engaging with the bed C
through a rack c fast thereon. The mutilated spur wheels. L, M, may be replaced
by a pair of toothed sectors. There may be more than one rack on the bed C, if
desired, but for convenience, the singular number is used.
The continuous rotary motion in opposite directions of the two wheels L, M,
will turn the pinion O through arcs each one of a length proportionate to the length
of the toothed surface then engaging with it, the directions of rotation on the
part of that pinion being alternate to correspond with the direction of the
respective wheel engaging with it for the time being. The bed C partakes that
alternation of motion, by means of the spur wheel P and the rack c already
described.
The improved gear just described is characterised by the connection between
the bed and it being limited to a rack on the underside of the said bed as dis-
tinguished from one on each side of the shaft N and both engaged alternately by
gear wheels on the said shaft. The advantages which the said improved gear
confers are more compactness, a smaller number of working parts, and a more
convenient and efficient gear for the purpose, than have hitherto been in vogue.
Obviously, the same result as far as regards the reciprocating motion of the bed C
is concerned, would be attained if the two wheels L, M, geared direct with the
wheel Pinstead of through the pinion O and the shaft N, but then they would
have to be correspondingly larger. The pinion increases the compactness of
the gear by being intermediate of the wheels L, M, and the wheel P.
It is obvious that with a double mutilated gear such as the one just described,
each driver, L or M, must be clear of the driven pinion or wheel before the other
driver, L or M, as the case may be, can engage with that driven pinion or
wheel; further, that the strain on the leading tooth of the driver is greater than
on any of the following teeth of it; and also that the driven pinion or wheel,
as the case may be, is likely to stop turning before it has reached the true end
of its travel, its driver leaving it there.
The present invention concerns itself more particularly with means for pre-
venting the excess strain faling upon the leading tooth of the driver as well as
with means for preventing the driven member of the gear-pinion or wheel P
as the case may be-stopping prematurely.
The means for preventing the excess strain falling upon the leading tooth of
the driver, consist of a surface Q fast on and projecting from the shaft N and a
tooth R fast to the respective driver. Both surface Q and tooth R stand in
the same plane, and each projects beyond the respective tooth. Their position
with reference to the leading tooth of the driver is such that the tooth Ŕ shall
fairly engage the surface Q and start the shaft N before, or at least as soon as,
that leading tooth can or does engage with the respective tooth on the driven
member of the gear, as clearly shown in Figure 2 in respect of the driver L
and the pinion 0. Each driver is fitted with a tooth R and the shaft N with
two surfaces Q. The latter, are conveniently formed on one and the same
plate Q¹.
The means for preventing the driven member of the gear stopping pre-
maturely, consists of a tooth S fast upon the shaft N and projecting from it,
and a projection T fast to each driver. This projection conveniently takes the

page_text: form of an anti-friction roller, as shewn. The tooth S and projections T are in
the same vertical plane. Their action is clearly indicated in Figure 2 in respect
of the driver M, where it is shewn that the respective projection T will engage
the tooth S before the teeth of the driver M clear the pinion O, and that it
continues in engagement with that tooth up to the time that the tooth R on the
opposite driver L engages with the respective surface Q.
The tooth S is conveniently of such a breadth that one of its flanks co-operates
with the projection T on the driver L and the other flank with that on the
driver M.
The plate Q' and the tooth S are both shewn as close to the pinion O and
the teeth R and projections T as carried by the drivers L and M, but those
positions are unimportant and they may be varied, so long as each shaft h, i,
carries a tooth Rand a projection T; and the shaft N, two surfaces Q and a
tooth S, all occupying with reference to each other, the positions described.
They may be adjustable as to projection and also as to time of engaging and
disengaging from each other, as may be desired.
Having now particularly described and ascertained the nature of my said
invention, and in what maner the same is to be performed, I declare that what
I claim is:-
1. The combination of bed or coffin plate; rack thereon; gearing engaging:
with the said rack; and a mutilated gear wheel or a toothed sector on each side
of the said gearing and alternately driving it; as set forth with reference to
the accompanying drawings.
2. The combination of bed or coffin plate; rack thereon; gear wheel engaging
with the said rack; pinion axially fast to the said gear wheel; and a mutilated
gear wheel or a toothed sector on each side of the said pinion and alternately
driving it; as set forth with reference to the accompanying drawings.
3. The herein before described combination of a pair of mutilated gear wheels
or toothed sectors adapted to act as drivers; a driven pinion or wheel engaged
by them alternately; means as set forth for preventing the excess strain falling:
upon the leading tooth of each driver; and means as set forth for preventing
the said driven pinion or wheel stopping prematurely.
I
4. The herein before described combination of a pair of mutilated gear wheels
or toothed sectors adapted to act as drivers; a driven pinion or wheel engaged
by them alternately; and means as set forth for preventing the excess strain
falling upon the leading tooth of the driver.
5. The hereinbefore described combination of a pair of mutilated gear wheels
or toothed sectors adapted to act as drivers; a driven pinion or wheel engaged
by them alternately; and means as set forth for preventing the said driven
pinion or wheel stopping prematurely.
Dated the 11th day of March 1898
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.