Improvements in and connected with Machines for the Grooving or Indenting of Pasteboard and the like to Facilitate Bending.
Year: 1896

page_text: Date of Applicati n, 4th Mar., 1896-Accepted, 16th May, 1896
COMPLETE SPECIFICATION.
Improvements in and connected with Machines for the Grooving
or Indenting of Pasteboard and the like to Facilitate Bending.
I, CARL ERNST PREUSSE, of Zweinaundorfer Strasse, of Leipzig-Anger-
Crottendorf, in the Kingdom of Saxony, German Empire, 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 :-
The paste-board used for the manufacture of paste-board boxes is generally
brittle, and is on being bent very liable to break. The purpose of my invention is
to overcome that drawback, and to make even very brittle paste-board adapted to
be bent without any fear of getting broken thereby.
I attain that purpose by subjecting the paste-board before bending it to a
preliminary treatment consisting in grooving or indenting the paste-board, in such
a manner, that the intended lines of bending are deepened, or formed into
grooves a respectively, as shown as an example in Fig. 5. If, thereafter the two
legs a' a 2 of the piece of paste-board shown are formed into a right angle (Fig. 6)
by bending them in the directions indicated by the arrows in Fig. 5, there occurs
not the slightest break at the line or edge of bending, and the paste-board retains
also at said latter place its original strength.
The most essential parts of iny improved machine for effecting said grooving or
indenting are formed by a ruler-like steel-ledge b (Figs. 3 & 4) that may be
vertically moved down upon the paste-board, and two similarly shaped steel
plates cc that support the paste-board, and may be moved in a horizontal
direction against, and from, each other. The working-edges of said plates take
upon a solid support d' that limits the downward movement of the ledge b, and of
the respective portion of the paste-board. I prefer to let said parts b c c'
co-operate in such a manner, that first the ledge 6 is moved down upon the paste-
board so as to bend or curve the respective portion of the latter, and
press it upon
the support a'; and I then cause the downwardly projecting hent or curved
portions of the paste-board to be compressed, or grooved or bent respectively,
by leading the plates c c against them. Said plates may commence their
inward travel before the downward travel of the ledge b has ceased, but I
prefer to let the plates c c catch said bent or curved portions of the paste-board
only after the same have reached the support d'.
The support d forms part of the table d that is carried by the standards e e.
The rear legs of the latter are connected by an axlef that serves as a bearing for
a torked treadle-lever g; this lever is connected by rods h h' with an axle i that
may move up and down within suitable slots d2 of the table. A spring (not
shown) tends constantly to keep the axle i in its highest position.
The table d carries two head-pieces that form guides for a vertically
movable frame l extending horizontally over the whole length of the table. Said
frame holds at its lower side the ruler-like steel-ledge b afore mentioned. The
upper part of the frame holds a horizontal axle m the ends of which project
beyond the head-pieces kk, and are formed into excentric pivots m¹ m 2. The
latter take into oblique slots n' of levers n that are pivoted at 2 to said
head-pieces, and are connected by links o o¹ with the projecting ends of the
axle . The slots n' extend excentrically with regard to the pivots n 2, in
such a manner, that on pulling the links o o' downwards also the frame is moved

page_text: downwards, for such a way, that the ledge 6 presses the paste-board upon the
support d¹.
In order to be able to regulate said way I have provided means for turning the
axle m within the frame 1, so that the latter is slightly raised or lowered in
consequence of the eccentricity of the pivots m² m2. Said means consist in a
bracket secured to the frame 1, and holding a bolt 12, and in a lever m³ secured
to the axle m, and having a curved slot m; the bolt passes through said slot,
and the respective portion of the lever m³ may be moved over the respective
portion of said bolt, and fixed to the same in any position by means of a female
screw or the like.
The horizontal steel-ledges c c are secured to plates ppl that are arranged upon
the table d, and may be moved against, and from, the support d'. Each of said
plates is provided with two projections p 2 that extend downwards through suitable
slots of the table, and are connected by pivots and links s with the axle i. If,
therefore, the latter is drawn downwards from the treadle-lever g by the mediation
of the rods h h', the plates p p with the ledges c c¹ are moved in the direction to
the support d' by the mediation of the links s.
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 I
claim is :-
1. In a machine for grooving or indenting paste-board at the place or portion
of an intended bending, the combination with a ledge b adapted to be moved in a
vertical direction, and with a support for the paste-board to be grooved or indented,
of two other ledges e c¹ arranged one before the other after said ledge b, and
adapted to be moved in a horizontal direction simultaneously against, or from, said
support, substantially as set forth.
2. In a machine for grooving or indenting paste-board at the place or portion of
an intended bending, the combination with a ledge secured to a frame l, and
adapted to be moved in vertical direction, by the agency of said frame, of two
other ledges cc secured to plates p p arranged one before, the other after said
frame 1, and adapted to be moved in a horizontal direction simultaneously against,
or from, a support adapted to receive the paste-board, and arranged below the said
frame, substantially as set forth.
с
C
3. In a machine for grooving or indenting paste-board at the place or portion of
an intended bending, the combination with two ledges c c adapted to be moved in
a horizontal direction simultaneously against, or from, each other, of another
ledge adapted to be moved in a vertical direction, and secured to a frame
guided by suitable head-pieces of the machine; an axle m having its bearings
within said frame, and having at its ends excentric pivots taking into slotted
levers connected to the mechanical movement of the machine; and means for
turning said axle, and fixing it in its adjusted position, substantially as set forth.
4. In a machine for grooving or indenting paste-board at the place or portion of
an intended bending, the general arrangement and combination of parts, substan-
tially as shown and described.
Dated this 3rd day of March 1806
CARL ERNST PREUSSE,
By De Katow & Co.,
Agents for the Applicant.