Improvements in Machinery for the Manufacture of Paper Bags.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machinery for the Manufacture of Paper Bags.
COBDEN CHADWICK, of 72, Greengate Street, Oldham, in the County of Lan-
caster, Mechanical Engineer, do hereby declare the nature of this invention to be
as follows:-
"
This invention relates to certain improvements in that class of machinery for
the manufacture of "rose or block-bottom bags, in which the paper proceeds from
a roll, is formed on a tube former, then passed through respective draw and sever-
ing rolls whereby it is cut and folded into bag shape when it is finally pasted and
carried over a drying cylinder, the paper passing uninterruptedly through the
machine at one uniform rate.
Machines for this purpose make an oblong bottomed bag, my present invention
is to supersede this by making a square bottomed bag, which is of great advan-
tage to users of the said bags
In this machine a finger or tucker and tucker blade sliding in a slotted bracket
are usually employed for the first or diamond shape fold of the bag. The finger
is at present extended (in the form of a thin blade or wire) through the second
pair of draw rolls, and when the diamond or first folds have been made, under
existing arrangements, it is impossible to close them or overlap one over the other
sufficiently, owing to this projecting portion of the finger.
In the present invention a cutter is placed, acting beneath the paper, just after
closing in of the longitudinal seam of the bag. this cutter makes two cuts in the
paper, these cuts in the paper, form an opening in the diamond fold for the pur-
pose hereinafter described.
In my invention the finger above mentioned has no wire or blade attached to
it. I attach a wire or strip of steel to a shaft sliding in a slotted bracket, this wire
or strip of steel is withdrawn from the bag (through the opening left by the two
cuts, made by the said cutter) just as the bag passing the second draw rolls.
By this arrangement, when the diamond or first folds have been made one fold
will overlap the other.
On each side of the finger a suitably curved creaser is fixed so as to enable the
diamond fold to be formed.
By this means, the usual bracket and tucker blade may be so arranged that a
greater length of paper will be tucked in to complete these folds consequently a
square bottom will be obtained.
Dated this First day of June 1808

page_text: Improvements in Machinery for the Manufacture of Paper Bags.
I, COBDEN CHLADWICK, of 72, Greengate Street, Oldham, in the County of Lan-
caster, Mechanical Engineer, 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 certain improvements in that class of machinery which
is employed for the manufacture of rose" or block bottom bags in which the
paper proceeds from a roll, is formed on a tube former, then passed through
respective draw and severing rollers whereby it is cut and folded into bag shape
and carried over a drying cylinder, the paper passing uninterruptedly through
the machine at one uniform rate of speed.
Machines that have hitherto been employed for this purpose, and such as is
described in the specification of Patent No. 13,093 of 1887, make an oblong
bottom bag. The object of this invention is to make a square bottom bag, which
is of great advantage to users.
In the accompanying two sheets of drawings to which I hereinafter refer, Fig. I
is a plan of so much of a machine (such as is employed for making paper bags)
as is necessary to show the application of my invention.
Fig. 2 is a longitudinal section of the same.
Fig. 3 shows the relative position of the paster block with the wires which
form a part of my invention, employed in the formation of the bottom of a bag.
Fig. 4 represents the bottom of a bag that is made by a machine as hereinbefore
named with my improvements applied.
Fig. 5 shows the same bag folded.
In these views similar letters refer to similar parts.
In this invention a pair of slitter rollers a and a¹ are fixed in a position to act
immediately after closing in of the longitudinal seam of the bag one set placed
above the paper and the other set acting below.
When the top slitter rolls a' come into contact with the bottom slitter rolls,
two slits are made in the paper for the purpose hereinafter described. These
slitter rolls are driven by a pair of elliptical wheels 6 by which a variable motion
is obtained which is necessary as the speed of the paper varies according to the
length of tube cut off. A finger or tucker c and a tucker blade d sliding in slotted
brackets are employed for the first or diamond shape fold of the bag. The finger
has hitherto been extended in the form of a thin blade or wire through the second
pair of draw rolls ee¹ and when the diamond or first folds have been made it is
not possible under existing arrangements to lap one fold over the other sufficiently
in consequence of the projecting portion of the finger.
In this my invention I attach wires or blades ff to a shaft g sliding in the
aforesaid slotted brackets ; which are extended to give free scope for the shaft 9,
said wires slide through a fixed bark between the shaft and the second pair of
draw rolls eel so as to keep them in position. The wires are actuated by rods l¹
which are connected to levers mm² each of which are attached to one end of a
link n, the opposite end of the said link being connected to the end of the tucking
blade d. The shaft to which the wires are attached is so arranged that when the
tucking blade is at its highest point in the grooves of the brackets j the links n
that are connected to the ends of the thrust levers m and m¹ gain an increased
distance, and the wires or rods are consequently being withdrawn through the
opening made by the slits from the partially formed bag as the diamond fold is
being made, or as the bag is passing the second draw rolls e and e¹. On one side

page_text: q
of the finger c I fix a suitably curved creaser or folder g for folding one side of the
diamond fold before the other in order to avoid the folds coming in contact with
one another and prevent them folding one over the other also to enable the fold
to be made, a small curved plate q' is fitted on the top of the blade of the folder
to prevent the paper tube when travelling towards the second draw rolls from
catching on the edge of the folder. By these means the tucker blade may be so
arranged that a greater length of paper will be tucked in so as to fold one over
the other and a square bottom bag obtained. I employ a solid paster q* with the
aforesaid wires passing on each side. To prevent the paste getting on the wires I
form a groove on each side of the paster the outside of the groove being of less
diameter than the centre of the paster.
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. In a machine for making bags the combination therewith of wires or blades
as ff connected to a shaft sliding longitudinally by which to form a diamond
fold with one side lapping over the other for the purpose and in the manner sub-
stantially as hereinbeforo described.
2. In a machine for making paper bags the use of a creaser or folder as I for
folding one side of the diamond fold before the other substantially as and for the
purpose herein before described.
GEO. DAVIES & SON,
Agents for the Applicant, 4, St. Ann's Square, Manchester.