Apparatus proyed therein, also Applicable to other Purposes.
Year: 1884

page_text: Apparatus proyed therein, also Applicable
to other Purposes.
I, WILLIAM HENRY HOOK, of No. 5 Chancery Lane, London, Manufacturer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN THE
MANUFACTURE OF ENVELOPES, AND IN THE MACHINERY OR APPARATUS EMPLOYED
THEREIN, ALSO APPLICABLE TO OTHER PURPOSES to be as follows:-
"
This Invention relates to improvements in machinery for the manufacture of
envelopes, for which prior Letters Patent were granted to me dated 5th day of
January, 1883, No. 76, in the Specification of which I described machinery for
pressing over the flaps of envelopes, such machinery consisting of a die or plunger
which pressed the envelope into a suitably shaped box or receptacle over the top
of which an india-rubber pad bad been previously laid in order to make the plunger
fit tightly within the box and so give the requisite pressure to the creases or folds
of the paper.
The object of my present Invention, is to increase the amount of pressure exerted
upon the paper at the creases or folds, so as to leave a permanent impression
thereof, and render all further manipulation or care unnecessary after the envelope
leaves the machine.
This I effect by dispensing with the india-rubber pad, and compressing the
edges of the envelope by means of straight edges formed of metal or other suitable
material.
And in order that my Invention may be more fully understood, I herein give
reference to the accompanying sheet of drawings illustrative thereof.
Figure 1. represents sectional elevation of such parts of my machine as are
related to the present Invention, and Figure 2. is a plan view of the said parts.
A is the table of the machine B. the gumming tank and C the table for
supporting the envelope under the pressure of the die or plunger D.
The table C is furnished with a hollow boss on the underside which fits into a
similar hollow boss on the table A. and is supported by the spiral spring E.
F are four metal plates which rest on the table C, being slightly rounded on
their lower inner edges, These plates are prevented from rising from the table, by

page_text: strips of metal placed over them and secured by screws at each corner of the
table C, such strips not being shewn in the drawing. Through the plates F pass
the ends a of the two armed levers G, these levers being hinged at c to the sides
of the gumming tank and at e to small lugs H, screwed to the underside of the
table C.
The action of the machine is as follows:-
An envelope form having been placed on the table in the usual manner the
plunger descends and forces it down onto the surface of the table C at the same
time turning up the flaps or corners.
-
In its descent the plunger depresses the table C to the extent of about half an
inch; and this depression by altering the relative positions of the fulcrums c and e
of the levers G causes the upper ends to incline inwards and produces a corre-
sponding movement of the plates F which are thus forced over the edges of the
already creased envelope and the four flaps of the envelope are perfectly folded
over the plate, so that when the plunger rises the envelope is then brought to the
surface of the box and is removed. The envelopes are packed upon each other
ready for banding as fast as the machine can be fed by the attendant with the
blank envelopes, every envelope being perfect, both in size and shape.
My Invention is also applicable for making boxes and other articles where paper
or pasteboard folding is required.

page_text: Machinery or Apparatus Employed therein.
I WILLIAM HENRY HOOK of N° 5 Chancery Lane London Envelope Manu-
facturer do hereby declare the nature of the said Invention for IMPROVEMENTS
IN THE MANUFACTURE OF ENVELOPES AND IN THE MACHINERY OR APPARATUS
EMPLOYED THEREIN, ALSO APPLICABLE TO OTHER PURPOSES" 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 Improvements in machinery for the manufacture of
envelopes, for which prior Letters Patent were granted to me dated 5th day of
January 1883 N° 76 in the Specification of which I described machinery for
pressing over the flaps of envelopes, such machinery consisting of a die or plunger
which pressed the envelope into a suitably shaped box or receptacle over the top
of which an india rubber pad had been previously laid in order to make the
plunger fit tightly within the box and so give the requisite pressure to the creases
or folds of the paper.
The object of my present Invention is to increase the amount of pressure exerted
upon the paper at the creases or folds, so as to leave a permanent impression thereof
and render all further manipulation or care unnecessary after the envelope leaves
the machine. This I effect by dispensing with the india-rubber pad and com-
pressing the edges of the envelope by means of straight-edges formed of metal or
other suitable material.
And in order that my Invention may be more fully understood I herein give
reference to the accompanying sheet of Drawings illustrative thereof.
Fig. 1 represents sectional elevation of such parts of my machine as are related
to the present Invention and Fig. 2 is a plan view of the said parts.
A is the table of the machine B the gumming tank and C the table for supporting
the envelope under the pressure of the die or plunger D. The table C is furnished
with a hollow boss on the underside which fits into a similar hollow boss on the
table A and is supported by the spiral spring E.
Fare four metal plates which rest on the table C, being slightly rounded on
their lower inner edges. These plates are prevented from rising from the table
by strips of metal placed over them and secured by screws at each corner of the
table such strips not being shewn in the drawing. Through the plates F pass
the ends a of the two armed levers G, these levers being hinged at c to the sides
of the gumming tank and at e to small lugs H screwed to the underside of the
table C.
The action of the machine is as follows-An envelope form having being placed
on the table in the usual manner the plunger descends and forces it down onto the
surface of the table C at the same time turning up the flaps or corners.
In its descent the plunger depresses the table C to the extent of about half an
inch and this depression, by altering the relative positions of the fulcrums c and e,

page_text: of the levers G, causes the upper ends to incline inwards and produces a corre-
sponding movement of the plates F which are thus forced over the edges of the
already creased envelope and the four flaps of the envelope are perfectly folded
over the plate so that when the plunger rises the envelope is then brought to the
Burface of the box and is removed and packed ready for banding as fast as the
machine can be fed by the attendant with the blank forms, every envelope being
perfect both in size and shape.
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
The use of the blades or pressers F actuated by the levers G, to which motion is
imparted by the descent of the plunger upon the table C substantially as herein
shewn and described.