Improved Apparatus for Taking-off Sheets from Platen Printing Presses.
Year: 1898

page_text: Date of Application, 3rd Oct.,
1898
Complete Specification Left, 30th June, 1899-Accepted, 19th Aug., 1899
.
Improved Apparatus for Taking-off Sheets from Platen Printing
Presses.
A communication from abroad from the Firm of ROCKSTROH AND SCHNEIDER
NACHFOLGER, of Löbtau, near Dresden, Germany.
I, WILLIAM LLOYD WISE, of 46, Lincol..'s Inn Fields, in the County of London,
Consulting Engineer and Chartered Patent Agent, do hereby declare the nature of
this invention to be as follows:-
This invention relates to an improved device for laying-off sheets from platen
printing machines. According thereto a bar under spring pressure is moved along the
platen and against the printed sheet; when the platen swings back from the type
forine of the foundation.
On the platen there is provided a bearing for a fixed axle on which there are
arranged side by side a sleeve which is capable of rotating, and a casing which is fixed,
The sleeve carries a bevel wheel which engages with a bevel wheel on a small shaft at right
angles to the sleeve. The sleeve is further provided with a dovetail-shaped longi-
tudinal slot in which a "prism" can be clamped by means of a screw which works in
an inclined slot in a second outer sleeve.
This outer sleeve is provided with carriers or drivers opposite to a ratchet wheel
attached to a spring casing, which is rotatably mounted in the fixed casing herein-
before refered to; the spring casing has connected to it one end of a spiral spring, the
other end of which is fixed to a carrying sleeve on the axle. This carrying sleeve is
connected to the fixed casing by means of a screw, which (after the screw has been
slacked) can be rotated for the purpose of altering the tension of the spiral spring.
A set collar prevents axial displacement of the ratchet mechanism.
To the spring casing there is connected one end of a bar, the other end of which
projects from a slot in the fixed casing, carries a shoe, and with the latter is always
kept down firmly by the spring of the bar against the upper surface of the platen.
This keeping down is of special importance because it guarantees a secure taking of
the bar behind the sheet.
Whilst the platen rocks back from the type forme of the foundation, a rubbing or
friction roller fixed on the same shaft as the bevel wheel arranged at right angles to
the sleeve rolls along a fixed path, and rotates the two bevel wheels and the sleeves
with the carriers or drivers, which latter rotate the ratchet mechanism, and wind up
the spring, move the bar forward against the printed sheet, and push the latter dowi
from off the platen. When the roller leaves its path, the spring draws the bar quickly
back, and winds the bar partly upon the spring casing, whereby the ratchet
mechanism is rapidly rotated. But if the platen is again rocked against the type
forme of the foundation, the sleeves are rotated in the reverse direction. The carriers
or drivers thus rotate backwards for the next forward stroke of the ratchet wheel and
the latter remains at rest. Furthermore, for the purpose of avoiding noise, the
carriers or drivers are placed out of engagement with the ratchet wheel by reason of
the movement of the aforesaid pin in the slot in the outer sleeve. The engagement

page_text: is re-established only by the outer sleeve coming back against the ratchet wheel,
when the roller has quitted the upper end of the path, and the platen moves into the.
vertical position. Then the laying off bar is again pushed forward on the return
stroke of the platen, and this motion is repeated, alternately with the drawing back
of the laying-off bar, so often as there are sheets printed. The carrying sleeve
together with the ratchet mechanism, and the outer sleeve together with the carrier
or driver can be moved axially along the axle and again fixed thereon, for the purpose
of shifting the laying-off bar at a suitable place on the platen.
Instead of a rubbing or friction roller, a grooved wheel on an inverted vee or roof
shaped path may be employed for driving the bevel wheels.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.
Improved Apparatus for Taking-off Sheets from Platen Printing
Presses.
A communication from abroad from the Firm of ROCKSTROH UND SCHNEIDER
NACHFOLGER, of Löbtau, near Dresden, Germany.
I, WILLIAM LLOYD WISE, of 46, Lincoln's Inn Fields, in the County of London,
Consulting Engineer and Chartered Patent Agent, 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 :-
This invention relates to an improved device for laying off sheets from platen
printing machines. According thereto a bar under spring pressure is moved along
the platen and against the printed sheet, when the platen swings back from the type
forme of the foundation.
<
Figs. 1, 2, and 3 of the drawings are respectively a plan, a longitudinal section,
and a cross section, showing the device arranged laterally of the platen.
Figs. 4 and 5 are views on a smaller scale showing two positions of the platen
with the device applied to it.
Figs. 6 and 7 are details.
On the platen & there is provided a bearing b for a fixed axle c on which there
are arranged side by side a sleeve which is capable of rotating, and a fixed
adjustable casing e. The sleeve d carries a bevel wheel f¹ which engages with a
bevel-wheel on a small shaft g. The sleeve is further provided with a dovetail-
shaped longitudinal slot in which a "prism" can be clamped by means of a
screw which works in an inclined slot in a second outer sleeve i (see Fig. 6).
This outer sleeve i is provided with carriers or drivers 22 opposite to a ratchet
wheel attached to a spring casing which is rotatably mounted in the fixed casing e
and has connected to it one end of a spiral spring the other end of which is fixed
to a sleeve m on the axle c. The sleeve m is connected to the fixed casing e by
means of a screw n, which (after the screw has been slacked), can be rotated for the
purpose of altering the tension of the spiral spring l. A set collar o prevents axial
displacement of the ratchet mechanism.
To the spring casing & there is connected one end of a spring bar p (see Fig. 3)
the other end of which projects from a slot in the casing e, carries a shoe p¹, and

page_text: 5
with the latter is always kept down firmly by the spring of the bar against the upper
surface of the platen. This keeping down is of special importance because it ensures
a secure taking of the bar behind the sheet.
Whilst the platen rocks back from the type forme of the foundation, a rubbing or
friction roller fixed on the same shaft as the bevel wheel f2 rolls along a fixed path s
and rotates the bevel wheels 2 fl and the sleeves d and with the carriers or
drivers 2, which latter, rotate the ratchet mechanism k¹ k, and wind up the spring 1,
move the bar p p¹, forward against the printed sheet t, and push the latter down
from off the platen. When the roller leaves its paths, the spring draws the bar p
quickly back, and winds the bar partly upon the spring casing k, whereby the ratchet
mechanism is rapidly rotated. But if the platen is again rocked against the type
forme of the foundation, the sleeves and are rotated in the reverse direction. The
carriers or drivers 22 thus rotate backwards for the next forward stroke of the ratchet
wheel k¹, and the latter remains at rest. Furthermore, for the purpose of avoiding
noise, the carriers or drivers are placed out of engagement with the ratchet-wheel by
reason of the movement of the aforesaid pin in the slot in the outer sleeve
(Fig. 5). The engagement is re-established only by the outer sleeve i coming back
against the ratchet wheel ¹, when the roller has left the upper end of the path 8,
and the platen moves into the vertical position. Then the laying off bar p plis again
pushed forward on the return stroke of the platen, and this motion is repeated, alter-
nately with the drawing back of the laying-off bar, so often as there are sheets
printed. The carrying sleeve m together with the ratchet mechanism, and the outer
sleeve i together with the carrier or driver 2 can be moved axially along the axle c,
and again fixed thereon, for the purpose of shifting the laying-off bar p p¹ at a suit-
able place on the platen.
Instead of a rubbing or friction roller r a grooved wheel 71 on an inverted,
vee or roof-shaped path s¹ may be employed for driving the bevel wheels f fi
(Fig. 7).
and ascertained the nature of the said
Having now particularly described
invention and in what manner the same is to be performed I declare that what
I claim is: -
1. In apparatus for taking-off sheets from platen printing-presses, the com-
bination with a rocking platen, of a flexible and resilient delivery bar or strap p pro-
vided with a shoe bearing on the surface of the platen, a casing or drum attached to
the platen and connected with said bar or strap and mechanisın actuated by the
rocking of the platen for turning said casing or drum and moving the bar or strap
across the platen-surface, substantially as herein described.
2. In apparatus for taking-off sheets from platen printing-presses, the combination
with a rocking platen, of a flexible and resilient delivery bar or strap provided with a
shoe bearing on the surface of the platen, a casing drum carried by the platen and to
which said bar or strap is attached, a spring for turning said casing or drum in
the direction for winding said bar or strap thereon, ratchet mechanism for turning said
casing or drum in the opposite direction for producing the outstroke of said bar, and
means for throwing said ratchet mechanism into and out of engagement, substantially
as herein described.
3. In apparatus for taking-off sheets from platen printing presses, the combination
with a rocking platen, of a flexible and resilient delivery bar or strap provided with a
shoe bearing on the surface of the platen, a casing or drum carried by the platen and
to which said bar or strap is attached, a spring for turning said casing or drum in the
direction for winding up the bar or strap, mechanism for turning said casing or drum
in the opposite direction to produce the outstroke of said bar or strap, said mechanism
including a frictional driving-roller and a fixed track on which said roller is caused to
run by the rocking of the platen for the purpose of actuating said mechanism,
substantially as herein described.
4. In apparatus for taking-off sheets from platen printing-presses, the combination
with a rocking platen of an axle c fixed to the platen, a casing or drum & fitted to turn

page_text: on said axle and provided with ratchet-teeth k¹, a flexible and resilient delivery bar or
strap p one end of which is attached to said casing or drum and the other end is
furnished with a shoe p¹ bearing on the surface of the platen, a spring / coiled within
the casing or drum and having its ends connected with said casing or drum and
axle repectively for turning the drum in one direction, a sleeve & fitted to turn on
said axle and furnished with a bevel-wheel f¹, a second sleeve i fitted to said sleeve d
and capable of moving lengthwise thereon, carriers or pawls on said sleeve i for
operation in said ratchet-teeth, a pin h¹ on said sleeve d working in an oblique slot i¹
in said sleeve i for engaging and disengaging said carriers or pawls with and from said
ratchet-teeth, a bevel-wheel carried by the platen and gearing with said bevel-
wheel f, a friction-roller attached to said bevel-wheel 2, and a fixed tracks on
which said roller is caused to run by the rocking of the platen, all substantially as
and for the purpose herein specified.
5. Apparatus for taking-off sheets from platen printing presses constructed,
arranged and operating as shewn in and described with reference to the drawings.
Dated this 30th day of June 1899
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.