Improvements in Arrangements Connected with Reciprocating Toothed Racks known as "Mangle-racks," Applicable more Particularly for Use in Platen Printing Machines.
Year: 1887

page_text: Date of Application, 5th Apr., 1887
Complete Left, 5th Jan., 1888
Complete Accepted, 10th Feb., 1888
Improvements in Arrangements Connected with Reciprocating
Toothed Racks known as "Mangle-racks," Applicable more
Particularly for Use in Platen Printing Machines.
We, THOMAS. COULTHARD, of Cooper Road, Marsh Lane, Preston, in the County of
Lancaster, Machinist, and JOHN BRADSHAW, of 15, Turner Street, in the same town,
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to that class of reciprocating toothed racks known as "mangle-
racks" in which the axis of motion of the driving pinion is fixed, the pinion gearing
into a rack having teeth upon each of its outside edges and upon its rounded ends,
the arrangement being such that when the rack arrives at the end of its traverse
in either direction it shifts over by a short transverse or sidewise movement, where-
upon the pinion operates upon the opposite row of teeth thereby causing the rack to
move in the opposite direction.
The object of our invention is to provide arrangements whereby the rack when
shifting over from side to side at the end of its traverse in either direction may
be caused to move bodily at right angles to the line of its path. To this end we
mount the rack so as to be capable of sliding upon two or more transverse slides or
guide rods arranged at suitable distances from each other and affixed to the plate
upon which the rack is carried.
The above described arrangement permits of the reciprocatory movement of
mangle-racks being greatly accelerated and as applied to platen printing machines in
which a to and fro movement has to be effected at great speed is especially
advantageous.
Dh: 5th dort of Anril 1887
"
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.

page_text: Improvements in Arrangements Connected with Reciprocating
Toothed Racks known as "Mangle-racks," Applicable more
Particularly for Use in Platen Printing Machines.
We, THOMAS COULTHARD,- of, Cooper Road, Marsh Lane, Preston, in the County
of Lancaster, Machinist, and JOHN BRADSHAW, of 15 Turner Street, in the same
town, Machinist, 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 that class of reciprocating toothed racks known as
"mangle-racks" in which the axis of motion of the driving pinion is fixed, the
pinion gearing into a rack having teeth upon each of its outside edges and upon its
rounded ends, the arrangement being such that when the rack arrives at the end of
its traverse in either direction it shifts over by a short transverse or sidewise move-
ment, whereupon the pinion operates upon the opposite row of teeth thereby causing
the rack to move in the opposite direction.
The object of our invention is to provide arrangements whereby the rack when
shifting over from side to side at the end of its traverso in either direction may be
caused to move bodily at right angles to the line of its path. To this end we mount
the rack so as to be capable of sliding upon two or more transverse slides or guide
rods arranged at suitable distances from each other and affixed to the plate upon
which the rack is carried.
The above described arrangement permits of the reciprocatory movement of
mangle-racks being greatly accelerated and as applied to platen printing machines in
which a to and fro movement has to be effected at great speed is especially
advantageous.
The accompanying Drawing is an underneath view of apparatus in which a repre-
sents an ordinary form of reciprocating or "mangle" toothed rack, the driving
pinion fast upon and rotating with the stationary axis or vertical spindle c.
d is a
back plate carrying the mangle-rack a, and to the plate d are fastened the two trans-
verse bars e e mounted in side bearings or sockets ff so as to be capable of sliding
easily therein. The bearings or sockets are secured to the table g which is moved
to and fro by the action of the angle-rack mechanism in a direct path as indicated.
by broken lines at the right hand side of the drawing where also is indicated the
altered position of the rack when shifted over from the position shewn at the left.
hand side of the drawing.
$
Instead of the bearings or sockets ff being affixed to the table as above described
they may be fastened to the back of the plate d which carries the rack so as to 'slide
upon stationary or fixed bars or guide rods, the bars being fixtures with the table as
will be well understood. But where the width of the printing or other machine will
permit, we prefer to adopt the arrangement shewn in the drawing as affording a
greater width of bearing and a better working-arrangement.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is :-
In combination with reciprocating toothed racks known as
mangle-racks" the
use or employment of transverse slides or guide rods arranged) substantially as
described and shown in the drawings for the purpose specified.
Daten this on day of January 10
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.