Improvements in Mechanism for Converting Rotary into Reciprocating Motion, chiefly Designed for Use in connection with Printing Presses, Planing Machines and the like.
Year: 1898

page_text: Date of Application, 19th July, 1898-Accepted, 20th Aug., 1898
[Communicated from abroad by WILLIAM HENRY REYNELL TOYE, of 616, Sausom
Street, City and County of Philadelphia, State of Pennsylvania, United States
of America, Printer.]
Improvements in Mechanism
for
Converting Rotary
into
Reciprocating Motion, chiefly Designed for Use in connection
with Printing Presses, Planing Machines and the like.
I, HENRY HARRIS LAKE, of the Firm of Hazeltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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 :-
My invention relates to the construction of mechanism for communicating
reciprocating motion to the beds of machines, such as printing presses, planers and
the like; my object being to utilize a well known device for converting rotary into
straight reciprocating motion and to provide for its safe and efficient use by means of
thrust rings and plates which maintain a rolling contact with each other on lines
coincident with the pitch lines of the enmeshed gears of the mechanism, said thrust
rings and plates serving to prevent undue wear of the gear teeth and particularly
to provide solid abutments at the ends of the reciprocating strokes of the
mechanism.
The nature of my invention will be best understood as described in connection
with the drawings in which it is illustrated and in which
Figure 1 is a side elevation of a reciprocating bed printing press provided with
my improvement;
Figure 2 is a plan view of the mechanism for reciprocating the bed.
Figure 3 is a cross-section on the line x-x of Fig. 2.
Figure 4 is an enlarged fragmentary view of the engaged teeth and thrust plates
as used by me, and
Figure 5 is a section on line y-y of Fig. 4.
A is the frame of the press having guides A¹ on which the reciprocating table B
moves. B¹ B¹ &c. indicating type forms and C C impression cylinders. D is an
annular internally toothed rack securely fastened to the frame A, D₁ indicating the
teeth. E is a journal concentric with the rack D and to which is secured a bevel
gear E', the teeth E2 of which are engaged by bevel wheel G actuated by power
shaft G¹. F is a crank pin secured, as shown, to gear wheel E¹ and is arranged to
describe a circle around the bearing E having a diameter equal to one half that of the
pitch line of the rack D. H is a gear wheel journalled on crank pin F and having
teeth H¹ engaged with those of rack D and having a pitch line of a diameter equal
to one half that of said rack. I is a pin secured to gear wheel H so that its centre
will lie in the pitch line of said gear wheel, said pin extending as shown into a
bearing in the bed B.
By the construction above described the pin I will as the crank pin F revolves
move in a straight line coincident with the section line x-x and will of course, cause
the bed B to move with it. In order to protect the teeth D¹ and H¹, to give greater

page_text: smoothness to the notion of the machine and to provide a strong abutment to take
up the thrust at each end of the stroke I form or provide the rack D with annular
thrust plates or rings J J¹, the inner faces of which coincide with the pitch line of
the teeth D¹ and I also form or provide the gear wheel H with thrust plates K K¹
the faces of which coincide with its pitch line and which consequently rest against
and roll upon the plates or rings J.J. Of course a single pair of contacting thrust
plates, as J and K, might be used but it is preferable to provide them above and
below the teeth as shown.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is:-
A device for giving reciprocating motion to machine beds having in combination a
stationary internally toothed annular rack D, a concentrically journalled crank pin F
moving in a circle of one half the diameter of that of the rack, a gear wheel H
journalled on the crank pin F having a diameter of one half that of the rack and its
teeth engaged with the teeth of the rack, a bed actuating pin I secured to the gear
wheel H with its centre coincident with the pitch line of said wheel's teeth, an
annular thrust ring or rings secured to the rack with its or their internal faces coin-
cident with the pitch line of the teeth of the rack and a thrust plate or plates
secured to the gear wheel H. with its or their faces coincident with the pitch line
of the teeth of said wheel.
-HASELTINE, LAKE & Co..
45, Southampton Buildings, London, W.C., Agents for the Applicant.