Improvements in Grooving and Scratching Apparatus for Millboards.
Year: 1890

page_text: Date of Application, 24th July, 1890-Accepted 30th Aug., 1890
COMPLETE SPECIFICATION.
Improvements in Grooving and Scratching Apparatus for
Millboards.
I, FRANZ HASENAU of Lennep near Barmen in the Province of Rhenish Prussia
Germany, Bookbinder 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 :-
In order to be better able to fold the card boards or mill boards in making boxes
and other similar work the card boards are scratched with a racing iron along the
folding lines when thin board is used, but it must be grooved when the mill board
reaches a certain thickness.
This is generally done by the use of circular cutters or a racing iron which is
the board while it is moved below it by the action of a friction roller
pressed upon the table of the grooving machine.
mounted
For making grooves two such scratches or cuts are made into the millboard and the
material between them is taken out by a special tool, a sort of a plane iron.
The apparatus invented by me serves for making scratches as well as grooves of
any width without the use of another tool, merely by putting two properly adjusted
rotary cutters at the right distance from each other.
In the accompanying drawing my improved apparatus is shown in different views
and sections.
Figure 1 is a front view of the apparatus in working order.
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3
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vertical sectional view.
"top view of fig. 1.
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section along line I II of fig. 2.
5 shows the deflector in detail.
.
6 shows a similar view to fig. 4 of a modified construction.
The cutter holder which I use is of similar construction to those used generally for
this purpose; it consists of the piece A which can be adjusted in a vertical direction
by the thumb screw B in the dove tail slide piece D. which itself can be shifted
lengthways in the corresponding groove of the bridge piece C of an ordinary grooving
machine so as to fit the depth and width of the groove to be made.
I mount the cutter E on the piece A in such a manner that it is quite free on one
side and that it can turn on a pin fixed therein; the slide piece D is so arranged that
it can be set at an angle to the bridge piece C in the horizontal plane, or what comes
to the same, that the cutter E rotates in a vertical plane standing at an angle to the
direction in which the millboard to be cut, moves.
This is the essential part of my invention.
I regulate the proper angle at which the piece A or the cutters E respectively have
to stand obliquely by means of two screws FF which press against the bridge-piece C
and thus raise the piece A at one side, as shown in figs. 3 & 4.
The same effect may be obtained by the use of little wedges which may be held in
a projecting part d of the slide piece D by a screw and nut as shown by fig. 6, or also
by equivalent means as they are familiar to any experienced mechanic.
For scratching one knife only may be used, which can be put straight or oblique,
but two can be used and they are then approached so much that the cutters touch
each other. If however grooves are to be made, two knives must be used and they
must be mounted as shown by figs. 1 & 3 so as to form an acute angle having its
point in the direction in which the board is moved.
Both cutters acting jointly, so form properly but one instrument making the groove
and raising the chip out of the millboard in a continuous strip without the use of any
other means as shown in fig. 2.

page_text: The grooving, without a plane iron as formerly used, is now done by the angular
position in the horizontal plane of the two cutters and is based on the following:
The two cutters being so arranged that their distance when they touch the mill board
is equal to the desired width of the groove, are screwed down to the depth of the
groove to be made into the board, thus nipping the latter between themselves and the
roller Runderneath, projecting just a little over the table T and rotating in
the direction indicated.
The circumferences of the circular cutters therefore converge in that direction
up to the horizontal plane placed through their center and they therefore also nip the
chip between them and thus raise it or pull it out of the mill board. It will therefore
be understood that grooves of any width and depth can be made; the acute angle of
the cutters having to be increased slightly for making deeper and wider grooves.
The piece G serves as a guide or deflector to prevent the chip from being taken
round by the cutters.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed 1 declare that what I
claim is:
The apparatus for grooving and scratching mill boards consisting in the com-
bination of two cutter holders A carrying circular cutters E facing each other and
being adjustable vertically by set screws B upon sliding pieces D which can be shifted
horizontally in a bridge piece C for regulating the depth and width of the groove.
The position of the cutters E to each other being so adjusted by set screws F F
(fig. 4) or wedges ƒ (fig. 6) or equivalent means that the vertical planes in which they
rotate form an acute angle the sides of which converge in the direction of the
movement of the millboard, the whole as set forth and described.
Dated this 21st day of July 1890.
KARL T. MAYER,
Agent for Applicant.