Improvements in the Manufacture of Paper Bags, and in Apparatus therefor.
Year: 1893

page_text: Date of Application, 14th Dec., 1893
Complete Specification Left, 11th Oct., 1894-Accepted, 17th Nov., 1894
PROVISIONAL OF BULTIVATION.
Improvements in the Manufacture of Paper Bags, and in Apparatus
therefor.
I, ALEXANDER DAVIDSON of 23 Upper Thames Street, in the City of London,
Paper Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object the manufacture of block bottomed paper
bage.
The apparatus consists of a table having a shallow rectangular groove or recess
in its surface of the same width as that of one side of the finished bag.
At each side of the groove there is a sheet of metal capable of being moved
inwards by a treadle or otherwise, the two plates meeting when square bags
are being made above the centre line of the groove. These I call the folding
plates.
A loose rectangular plate of metal fitting the groove is also provided for forming
the bag upon. This forming plate is made in three pieces connected together by
transverse hinges. The piece at one end is of half the size of the bottom of the
finished bag, the middle piece is somewhat longer than one of the sides of the bag
and the other end piece is as large as the other two pieces put together.
The sheet of paper to be formed into the bag is placed onto the table suitable
gauges or stops being provided to determine its position. The part of the sheet
above the groove is forced into the latter by means of the forming plate.
The folding plates are then moved inwards above the forming plate lying in the
groove thereby folding the paper over both edges of the forming plate. The free
edges of the sheet are then doubled back by hand over the folding plates, the long
portion of the forming plate (which hitherto has not been in contact with the paper)
is now turned upon its hinge onto the top of the folding plates and partly formed
bag, this being done either by hand or preferably by a lever or spring actuated by
the treadle or a handle. The edges of the paper are next doubled over this portion
of the forming plate and stuck together. The treadle is then released and the
folding plates withdrawn by springs or otherwise and the forming plate with the
paper upon it removed. The next operation is to form the bottom of the bag which
is done by turning back the short portion of the forming plate about its hinge and
folding the paper in the usual way. The short portion is then turned into its
former position and the whole of the forming plate is withdrawn leaving the bag.
The edges of the paper are pasted at the proper places before commencing the
folding.
The corners of the block bottom may be stuck down either before the former
plate is withdrawn from the bag or subsequently.
Dated this 14th day of December 1893.
ALEX. DAVIDSON.

page_text: Improvements in the Manufacture of Paper Bags, and in Apparatus
therefor.
I, ALEXANDER DAVIDSON of 23 Upper Thames Street, in the City of London,
Paper Manufacturer, 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 has for its object the manufacture of block bottomed paper
bags.
The apparatus consists of a table a shown in section half size in Figure I having
a shallow rectangular groove or recess & in its surface of the same width as that of
one side of the finished bag.
At each side of the groove there is a sheet of metal c capable of being moved
inwards by a treadle or otherwise, the two plates meeting when square bags
are being made above the centre line of the groove. These I call the folding
plates.
In Figure 1 the plates c work in guides c¹ and are actuated by bent levers d
passing through slots in them. The levers d are pivotted at ' and slotted to receive
pins e on the vertical rod eworked by a treadle.
A loose rectangular plate of metal shown half size in Figure 2 fitting the groove
is also provided for forming the bag upon. This forming plate is made in three
pieces connected together by transverse hinges. The piece flat one
end is of half the size of the bottom of the finished bag, the middle piece f* is
somewhat longer than one of the sides of the bag and the other end piece f' is as
large as the other two pieces put together.
The sheet of paper g to be formed into the bag is placed onto the table a suitable
gauges or stops being provided to determine its position. The part of the sheet
above the groove is forced into the latter by means of the parts f¹ f' of the
forming plate as shown in diagram in Figure 3.
The folding plates c are then moved inwards above the parts f'f' of the forming
plate lying in the groove b thereby folding the paper over both edges of the forming
plate as shown in diagram at Figure 4. The free edges of the sheet are then
doubled back by hand over the folding plates, the long portion f³ of the forming
plate (which hitherto has not been in contact with the paper) is now turned upon
its hinge onto the top of the folding plates and partly formed bag as shewn in
diagram at Figure 5, this being done either by hand or preferably by a lever or
spring actuated by the treadle or a handle. The edges of the paper are next
doubled over this portion of the forming plate and stuck together as shewn in
diagram at Figure 6. The treadle is then released and the folding plates with-
drawn by springs or otherwise and the forming plate with the paper upon it removed.
The next operation is to form the bottom of the bag which is done by turning back
the short portion of the forming plate about its hinge and folding the paper in the
usual way which is well known and needs no description. The short portion f'l is
then turned into its former position and the whole of the forming plate is with-
drawn leaving the bag. The edges of the paper are pasted at the proper places
before commencing the folding.
The corners of the block bottom may be stuck down either before the former
plate is withdrawn from the bag or subsequently.

page_text: Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed I declare that what
claim is :-
1. The process of manufacturing paper bags substantially as described an
5 shown at Figures 3, 4, 5 and 6.
2. The forming plate substantially as described and shown at Figure 2.
Dated this 10th day of October 1894.
FDNAY
ALEX. DAVIDS