Improvements in Paper Bags, and in Machinery for Making the same
Year: 1895

page_text: Date of Application, 2nd Sept., 1895
Complete Specification Left, 2nd June, 1896-Accepted, 4th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Paper Bags, and in Machinery for Making
the same
We JOHN DAVIDSON and WILLIAM SMITH MURRAY both of Magie moss
Paper Mills Aberdeen, do hereby declare the nature of this invention to be as
follows:-
Blocked shaped or square bottomed bags are often made from a continuous web
of paper by parting its edge and folding it around a former plate so forming it
into a tube, then severing a piece of this tube the proper length to make a bag of
the desired size. The bottom is afterwards folded and pasted. In cutting off the
length of tube two cuts are employed; first a semi-circular slit is made in onė
side of the tube whilst it is still on the former plate leaving a flap or overlap for
the bottom of the next bag, and secondly cuts are made when it comes to the end
of the former plate completely across one side and on the other side from the edges
to the semi-circular slit.
We replace the serrated blades now used for the latter cuts by a scissors having
a fixed and a revolving blade so as to clip each bag off clean instead of breaking
or tearing it off as at present.
In order to prevent the flap or tongue which is necessary for the formation of
the next bag being cut off although it projects beyond the line of the cut, we
employ a spring fixed on the former plate, which raises the tongue immediately
after it is formed by the semi-circular cut. A rod then catches it and doubles it
back, so that the blades which cut off the bag do not touch it.
Dated this 30th day of August 1895.
JOHN DAVIDSON.
W. S. MURRAY.
•
Improvements in Paper Bags, and in Machinery for Making
the same.
We, JOHN DAVIDSON, and WILLIAM SMITH MURRAY, both of Mugiemoss
Paper Mills, Aberdeen, 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 :-
Blocked shaped or square bottomed bags are often made from a continuous web
of paper by pasting its edge and folding it around a former plate so forming it
into a tube, then severing a piece of this tube the proper length to make a bag of
the desired size. The bottom is afterwards folded and pasted. In cutting off the
length of tube two cuts are employed; first a semi-circular slit is made in one
side of the tube whilst it is still on the former plate leaving a flap or overlap for
the bottom of the next bag, and secondly cuts are made when it comes to the end
of the former plate completely across one side and on the other side from the edges
to the semi-circular slit.

page_text: We replace the serrated blades now used for the latter cuts by a scissors having
a fixed and a revolving blade so as to clip each bag off clean instead of breaking or
tearing it off as at present.
In order to prevent the flap or tongue which is necessary for the formation of
the next bag being cut off although it projects beyond the line of the cut, we
employ a spring fixed on the former plate, which raises the tongue immediately
after it is formed by the semi-circular cut. A rod then catches it and doubles it
back, so that the blades which cut off the bag do not touch it.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan and Figure 2 an underside view of the blank from which a
bag is made.
Figure 3 is a sectional side elevation and Figure 4 a plan of so much of a paper
bag making machine as is necessary to illustrate our invention.
a is the ordinary former plate along which a tube of paper is fed. b is the
semi-circular cutter mounted on a rocking shaft by which the cuts A (Figure 1) are
made at regular intervals in the top thickness of the tube without penetrating to
the bottom thickness. e is a spring fixed to the top of the former a by which the
tongues B formed by the cuts A are raised so as to be caught and turned back by
the rod d which projects downwards from the transverse bar d and d² is a similar
rod also carried by the bar d which ensures the tongues remaining turned back as
they pass through the cutters. e is a fixed transverse cutter blade and f is a
cutter blade carried by the revolving shaft f¹ which by periodically moving across
the blade e makes the cuts CD (Figures 1 and 2) at the ends of the blanks
without however cutting off the nose of the tongues B which are turned back out
of the way. g' is a rod carried by the transverse bar g which keeps the tongues B
in position after the blanks have been severed from the tube.
The remainder of the machine for completing the bags in the usual way is of
ordinary and well known construction and requires no description.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. Paper bags of the class referred to in which the blanks are separated by
clean transverse cuts in place of serrated cuts as at present.
2. Forming the blanks for the bags referred to in Claim 1 by first making the
ordinary semi-circular cuts in the tube of paper turning back the tongues so
produced and then severing the blanks by transverse cuts.
3. Forming the transverse cuts by means of a fixed and a rotating blade.
4. Apparatus for making paper bags substantially as described and shown in the
drawings.
Dated this 2nd day of June 1896.
CARPMAEL & Co.,
Agents for the Applicants.