Improved Paper Registering or Adjusting Apparatus for Book and other Printing Presses.
Year: 1890

page_text: Date of Application, 5th Aug., 1890-Accepted, 20th Sept., 1890
COME LEID STEIFICATION.
Improved Paper Registering or Adjusting Apparatus for Book and
other Printing Presses.
I MAX LEHNERT, Machinery Manager, of Hamburg in the Empire of Germany
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 this invention is to simplify the mechanism by which the paper sheet
to be printed when placed on the platen of a book or other printing press provided
with a layer on, is moved thereon so as to register truly with the form during
printing.
Such mechanism has generally been heretofore constructed so that the sheet laid on
the platen is shifted into its correct position by the action of three mechanically
moved bars operating against three sides of the sheet and moving together to ensure
a more or less exact position for the sheet between them.
Such apparatus as heretofore made necessitated the employment of complicated
mechanism in the platen and is not easily removable, nor is it suitable to a folding
platen consisting of two parts where small space is an object and often essential.
Furthermore as heretofore made parts of such apparatus project and cause injury
to the clothes etc. of the printers.
The accompanying drawing illustrates the improved apparatus
Fig. 1 being a side elevation
Fig. 2 a front elevation and
Fig. 3 a plan thereof.
A is the platen B the layer on, C is the bar or back rest against which are laid the
printed and thrown off sheets with the edge which carries the registering marks.
The peculiar features of the present construction consist in providing this back rest C
with an adjustable projecting bar or finger m held always at right angles to the bar C
and providing the bar C with positive movement across the platen in the direction of
a line cutting said angle so that the sheet laid upon the table is met on two sides
simultaneously and moved diagonally.
A block p is likewise moved towards the finger m from the opposite side directly
the main registering part Cm is in motion and ensures the correct position from the
third side.
The operating mechanism is as follows: The back rest C is provided with the
inclined slots and into which respectively engage the pins s and s¹ fixed on the
platen, the reciprocating bar e moves the lever the fulcrum of which is at d and
the said lever moves the back rest C with the finger m. The bell crank lever r
fulcrumed at a transfers the reciprocating movement of the bar e to the block p.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In means for causing the true registering of a sheet to be printed on the platen,
a back rest C with an adjustable perpendicular projection bar m thereon said back
rest being guided to be moved in the direction of a line cutting the angle formed by
said back rest and projecting bar whereby the sheet is adjusted from two sides sub-
stantially as set forth.
Dated this 5th day of August 1890.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.