Improvements relating to Pneumatic Sheet Feeding Devices for Printing Machines.
Year: 1899

page_text: Date of Application, 13th Nov., 1899-Accepted, 17th Mar.,
1900
Improvements relating to Pneumatic Sheet Feeding Devices for
Printing Machines.
I, FRANZ PAUL BAUR, of 24, Mariahilfplatz, Munich Bavaria, German Empire,
Chief Engineer of Works, 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:-
of
According to this invention the pneumatic device or sucker whereby the sheet
paper is lifted off the pile of paper for being fed into the printing press receives
a decided turning movement of up to 90° or more so that the one edge of the
sheet is bent to that angle and is, in the ascent of the sucker, with certainty
detached from the next underlying sheet.
Fig. 1 is a side view of the apparatus partly in section on line M N of Fig. 2;
Fig. 2 is front elevation shewing the sucker boxes in section. Figs. 3 to 6 shew
the sucker in four successive positions relatively to the paper pile, and during the
sucking and lifting of the sheet.
The rising and falling frame of the apparatus consists of two lateral arms S, S¹,
see Figs. 1 and 2 each pivoted at the back end by pivot pins Z and Z¹ to the
main frame of the printing machine the forward ends being suitably stayed together
transversely as for example by the stay bolt R. The frame is caused to rise and
fall by means of cams C, C¹ mounted on a transverse shaft C³ revolving in bearings
on the aforesaid main frame and driven by suitable gearing in connection with
the printing machine and by means of rods B, B', pivoted to the forward ends
of the arms S S¹ respectively and operated by the said cams. The arms S S¹ are
provided at the forward ends with vertical guides and sliding block P and P¹ to
which are pivoted at 0 and 0³ respectively lovers N N rigidly connected fogether
by a cross-bar M to which are attached a suitable number of suckers A, A1, A2, A³
in such a manner that the rearward bottom corners a of the said suckers as they
fall upon the pile of paper see Fig. 3 coincide with the centres of the pivots 0, 0º.
The upper ends of the levers N, N¹ are conveniently arranged to carry the main
air pipe K provided with suitable flexible or elastic branch air tubes to the several
suckers.
The air pipe K is connected by a rubber tube to an air pump H which is operated
by a rod E and a cam D mounted on the shaft C³..
The levers N N and therefore the suckers A, A1, A2, A³ are caused to vibrate
at suitable intervals in the following manner:-To the lever N' is pivoted one
end of a rod Q' the other end of which is pivotted to the upper arm of the double
armed lever loosely mounted on the pivot pin Z and which is caused to
vibrate by a rod Q pivoted to the lower arm thereof and operated by a cam Q'
mounted on the shaft C.
In order to lower the aforesaid suckers after each feeding operation to the
extent of the thickness of a sheet of a paper the blocks P, P₁ are carried by
screws G G¹ respectively which are operated by the falling of the aforesaid moving
frame by means of the pairs of bevel wheels V V¹ spindle W ratchet wheel ✗

page_text: mounted on said spindle and ratchet / attached to the slotted arın X¹ one end of
which is loosely mounted on the spindle W the other end being connected by
an adjustable pivot joint X to one end of a link y which is connected at the other
by a pivot y to the main frame of the printing machine.
To allow for the difference in the thickness between one kind of paper and another
that may be used the stroke of the slotted arm X' may be varied by adjusting the
position of the pivot joint X within the slot of the arm X¹ whereby the move-
ment of the ratchet wheel X and thereby the movements of the blocks P PI will
be increased or diminished. Vice-versa the suckers may be stationary and the
table F whereon the pile I of paper rests is then made to rise periodically for
the same purposes.
On a fresh pile of papers being inserted the height of the suckers may be
adjusted to begin with by a hand wheel W mounted on one end of the spindle W.
The cams D, C, C and Q are so formed as to effect the movements respectively
of the air pump H the frame S, S! and the vibration of the suckers,A. A1, A2, A³,
so that the operation of lifting off a sheet of paper is as follows. The pile of
paper I having been laid upon the table F the frame S S¹ descends until the
suckers A, A, A, A³ rest upon the top of the pile of paper as shown in Fig. 3.
The forward edge of the top sheet of paper is now sucked up against the sucker
boxes in the well known manner by the air pump H operated by the cam D. By
the cam Q the suckers are then caused to move, with the corner a as a centre,
through an angle as shewn in Fig. 4 of 90°. Through this turning movement
one edge 1¹ Fig. 4 of the sheet is detached and moved upward through the same
angle from the pile that is from the position Fig. 3 to that of Fig. 4. This
bending of the edge of the paper is for the purpose of, in the subsequent ascent,
effectually detaching it from the next sheet below, for by this bending of the edge
of the paper sheet a tension is created in the paper sheet which is greater than
the adhesion of the same to the next lower sheet. The frame S S is next raised
by the cams C, C₁ so that the relative positions are as shewn in Fig. 5. The
suckers A, A¹ A³ A³ are then caused by the cam Q³ to return to the original
vertical position so that the relative positions are as shewn in Fig. 6. The sheet
is then by means of rollers fingers or grippers carried to the printing machine
in the known manner. Finally the frame S, S¹ is allowed to fall by the
cams C C¹ so as to return to the relative positions shewn in Fig. 3 and the opera-
tions are repeated.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. A frame with rising and falling action said frame carrying the sucker boxes
which by suction lift the edge of the uppermost sheet away from the next under-4
lying sheet in the pile and bend it away therefrom and thus detach it therefrom,
the sucker boxes passing through a sufficient angle for that purpose.
2. The construction of pneumatic sheet feeding apparatus described with refer-
ence to the drawings.
Dated this Thirteenth dow of XL.
1058
ember 1006.
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.