CERTAIN IMPROVEMENTS IN MACHINERY OR APPARATUS TO BE EMPLOYED IN THE MANUFACTURE OF PAPER BAGS
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by Charles Harris at the Office of
the Commissioners of Patents, with his Petition, on the 24th March
1868.
I, CHARLES HARRIS, of the Firm of Skidmore and Harris, of Man-
chester, in the County of Lancaster, do hereby declare the nature of
the said Invention for "CERTAIN IMPROVEMENTS IN MACHINERY OR APPARATUS
TO BE EMPLOYED IN THE MANUFACTURE OF PAPER BAGS," to be as follows:-
My Invention is designed for the purpose of manufacturing paper
bags having square or flat bottoms, and the first part of the Invention
relates to the formation of the paper tubes from which the bags are
subsequently constructed.
My improvements consist, first, in an arrangement of mechanism
constructed as follows:-A roll of paper is mounted in suitable bearings
below a guide roller and bed, over which it is drawn in a continuous
sheet by rollers which are situated at the opposite end of the bed, over
which it passes, and which revolve continuously or intermittently; one

page_text: edge of the paper before passing over the guide roller is pasted by means
of an endless cord partly immersed in adhesive material, and a vibrating
arm supporting a bowl over which the cord passes allows of the proper
application of the paste to the varying and irregular edges of the paper.
The paper then passes over the guide roller and under two vertical
wheels, which crease it where required, and support the presser at the
point whence the folding into tube form commences; it then passes
under curling guides, which fold or overlap the two edges of the paper,
and when so folded it passes under adjustable bars or plates which
crease the overlap to the width of paper tube required; the tube then
passes under the drawing rollers before mentioned and between two
plates, whence it issues in continuous lengths or intermittently, and
is severed by reciprocating or revolving cutters into lengths required
for the completion of the bag. The tubes thus severed are then placed
one by one against a horizontal bar which supports the tube at about
one-third of its length, at which point it is acted upon by two rollers,
the first folds over one half the unsupported third of its length at right
angles, and the second roller folds the remaining half, thus forming
such third portion of the bag into a diamond-shaped bottom, which
overhangs the stem or tube in the form of a T, the final operation
being performed by apparatus which constitutes a second part of my
improvements.
This apparatus consists of a bed or table in which a longitudinal
groove or slot in which the now flat stems or tubes of the partially
formed bags are placed, the overhanging portions being upon the
surfaces of the table, the tubes being propelled towards the opposite
end thereof by means of an endless chain and elastic cushions, and
during such movement the parts required to adhere are pasted by
passing under a roller, to which the paste is supplied from a trough,
the supply being governed by curved plates or blades which may be
adjusted by means of set screws to press against the roller, or to leave
a passage for the paste to the roller. When thus pasted they are acted
upon by two revolving creasers, which turn up two angles or corners,
and the said surfaces are forced into contact by means of rollers, and
the flat tube during such passage is turned into a horizontal position
by means of a curved bed, over which it passes, and the bag is subjected
to the action of pressure rollers, which deliver the finished bags ready
for use.

page_text: In the formation of a bag with a bottom folded over at right angles
the upper half of a portion at the end of the tube is cut off by a
knife, and the projecting edge is pasted and folded over by self-acting
means of a similar description to that described.