An Improved Grinding Machine.
Year: 1894

page_text: Date of Application, 12th Nov., 1894
Complete Specification Left, 19th June, 1895-Accepted, 27th July, 1895
An Improved Grinding Machine.
I, GOTTLIEB HEERBRANDT, of Raguhn, Anhalt, in the German Empire,
Machine Maker, do hereby declare the nature of this invention to be as
follows:-
My invention relates to a grinding machine especially adapted for grinding the
circular cutters of paper cutting apparatus but which can also be employed for
shaping or grinding other objects.
According to my invention I mount in suitable bearings beneath a bed-plate
supported on legs a driving shaft carrying a series of pulleys and a friction roll
adapted to be shifted by a lever. A horizontal friction disc provided with a pulley
is mounted on a vertical spindle pendent from the bed-plate. The friction disc is
pressed downwardly upon the rolls by a spring. A pulley is mounted at the lower
end of a spindle projecting upwardly through the bed-plate. A belt connects the
said pulley with the pulley on the disc, the two pulleys being located at the same
level. A rotary motion is therefore imparted to the spindle from the driving shaft
through the roll, disc, pulleys and belt.
In the bed-plate is formed a segmental slot through which the spindle passes, the
saine being guided in a hub pendent from a segment arranged to swivel about a
vertical pivot.
On the upper surface of the bed-plate are formed ways for a
carriage which can be moved toward and from the spindle by a screw and handle.
To a horizontal stud having a bearing in the carriage is rigidly affixed an arm
carrying at its free end a transverse spindle having mounted thereon at one end a
pulley and on the other end the grinding wheel. On the carriage are also mounted
two loose, but connected driving pulleys, the latter driving the pulley on the
transverse spindle and consequently the spindle itself by means of a belt. The
former driving pulley is driven from one of the pulleys on the driving shaft by a
belt. To the threaded end of the said horizontal stud is affixed a handle affording
means for swinging the arm in a vertical plane and for holding the same in any
desired position. The handle is provided with a nose and the arm with a lug or
stop adapted to be engaged by the former, and in addition thereto the arm is
provided with a second lug and the carriage with an ear through which a set-screw
passes.
In the upper part of the carriage is located a coil spring one end of which is
attached to the horizontal stud and the other end to the arm. The action of this
spring tends to lift the said arm. If desired the free end of the arm which is
provided with a box for the transverse spindle may be arranged to swing in a vertical
plane at right angles to the plane of motion of the arm. This may be
accomplished by providing the box with a trunnion fitted in a socket in the arm
and held by a set-screw. This construction permits the grinding wheel to be placed
at an angle to the work.
The cutter or other object to be ground is secured to the upper end of the
vertical spindle projecting through the bed-plate. The cutter is then placed in
the desired position with reference to the grinding wheel by moving the segment
about its pivot and is so held by screwing up a bolt.
By means of this laterally movable spindle, cutters of different size can be
ground alike and equally well, and by the provision of a sliding carriage the
grinding wheel can also be adjusted in this direction for every dimension of cutter..

page_text: With the aid of the sliding carriage the pirotted arm and the laterally movable
spindle, the cutter or other object rotating with the said spindle can be ground in
any desired manner.
The scope of the machine is further increased by the arrangement for setting
the grinding wheel at an angle.
The nose is formed on the arm to hold the grinding wheel above the work by
engaging with the stop on the carriage when the latter is released, thereby
permitting the work to be removed from the laterally movable spindle without
danger. The other lug and the set-screw serve to afford means for a fine adjustment
of the grinding wheel to the work, and also to prevent excessive biting into the
work on lowering the arm.
To the same end I sometimes employ an arrangement consisting of a bracket
attached to the base of the carriage by a universal joint and reaching over the arm.
The said bracket carries an adjusting screw bearing against the arm so that the
same can be gradually depressed. By reason of the universal joint the bracket
accommodates itself to the motion of the arm and can be swung to one side when
not in use.
By arranging a second carriage on which frame cutters can be fastened on the
bed-plate of the apparatus at a right angle to the carriage the apparatus can be
used to grind straight or bent cutters for cross cutting paper machines.
The carriage on which the frame cutters are to be fastened can be driven by
gear or screw wheels from the laterally movable spindle or by a spindle and gear
or screw wheels from the driving shaft."
Dated this 12th day of November 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
I, GOTTLIEB HEERBRANDT, of Raguhn, Anhalt, in the German Empire,
Machine Maker, 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 :-
My invention relates to a grinding machine especially adapted for grinding the
circular cutters of paper cutting apparatus, but which can also be employed for
shaping or grinding other objects.
The nature of my invention will be fully understood when described in connection
with the accompanying drawings, in which :-
Figure 1 represents a plan or top view of a machine constructed according to
my invention:
Figure 2 is a side elevation:
Figure 3 is a vertical section on the line 3-3, Figure 2, drawn to an enlarged
scale:
Figure 4 is a plan detail view of part of the machine drawn to the same scale as
Figure 3:
Figures 5 and 6 are detail views illustrating modifications.
Similar letters of reference designate corresponding parts throughout the several
views.
Referring at present to Figures 1 and 2, the letters B and A designate
respectively the bed-plate and supporting legs of a suitable stand. Beneath the
bed-plate B is mounted in suitable bearings a driving shaft C carrying the driving-
pulley D, loose pulleys E, pulley F and a friction roll G adapted to be operated by
a horizontal friction disc K provided with a pulley L and mounted on a vertical

page_text: spindle Jpendent from the bed plate B. The friction disc K is pressed
downwardly upon the roll G by a spring M and can be shifted out of engagement
with the roll by means of a lever H. N is a pulley mounted at the lower end of a
spindle projecting upwardly through the bed-plate. A belt P connects said
pulley with the pulley L on the disc K, the two pulleys being located at the same
level. A rotary motion is therefore imparted to the spindle O from driving
shaft C through roll G, disc K, pulleys L and N and belt P.
In the bed-plate is formed a segmental slot Q through which the spindle O
passes, the same being guided in a hub R pendent from a segment T arranged to
swivel about a vertical pivot S. On the upper surface of the bed-plate are formed
ways U for a carriage V which can be moved toward and from the spindle O by
an ordinary screw and hand wheel W. To a horizontal stud X having a bearing
in the carriage is rigidly affixed an arm Y, carrying at its free end a transverse
spindle 6 having mounted thereon at one end a pulley c and on the other end the
grinding wheel d. On the carriage are also mounted two loose, but connected
driving pulleys Z and Z', the latter driving the pulley c and consequently the
spindle b, by means of the belt f. Pulley Z is driven from pulley F by a belt e.
To the threaded end of the stud X is affixed a handle a affording means for
swinging the arm Y in a vertical plane and for holding the same in any desired
position. The handle a is provided with a nose g and the arm Y with a lug h
adapted to be engaged by the former, and in addition thereto the arm Y is
provided with a lug i and the carriage V with an ear through which a set screw /
passes.
In the upper part of the carriage V (Figure 3) is located a spiral spring 1, one
end of which is attached to the stud X and the other end to the arm Y. The
action of this spring tends to lift the said arm. If desired the free end of the
arm Y which is provided with a box m for the spindle b, may be arranged to swing
in a vertical plane at right angles to the plane of motion of the arm Y. This may
be accomplished by providing the box m with a trunnion n fitted in a socket in the
arm Y and held by a set screw o. This construction permits the grinding wheel to
be placed at an angle to the work.
The cutters, or other object to be ground is secured to the upper end of the
spindle O. The cutter is then placed in the desired position with reference to
the wheel d by moving the segment T about its pivot S and is so held by screwing
up the bolt t.
By means of this laterally movable spindle, cutters of different size can be
ground alike and equally well, and by the provision of a sliding carriage V the
grinding wheel d can also be adjusted in this direction for every dimension of
cutter. With the aid of the sliding carriage V, the pivotted arm Y and the
laterally movable spindle O, the cutter or other object rotating with said spindle
can be ground in any desired manner.
The scope of the machine is further increased by the arrangement for setting the
grinding wheel at an angle as described with reference to Figure 4.
The nose g is formed on the arm Y to hold the grinding wheel above the work
by engaging with the stop h on the carriage when the latter is released, thereby
The
permitting the work to be removed from the spindle without danger.
lug and the set screw k serve to afford means for a fine adjustment of the
grinding wheel to the work, and also to prevent excessive biting into the work on
lowering the arm Y.
To the same end the construction shown in Figure 6 may be employed where
a¹ is a bracket attached to the base of the carriage V by a universal joint 6' and
reaching over the arm Y. The said bracket carries an adjusting screw c¹ bearing
against the arm, so that the same can be gradually depressed. By reason of the
universal joint the bracket accommodates itself to the motion of the arm and can
be swung to one side when not in use.
It is of course to be understood that the several mechanical details involved can
be substituted by their equivalents.

page_text: By arranging a second carriage, on which frame cutters can be fastened,
on the hed-plate of the apparatus, at a right angle to the carriage V, the
apparatus can be used to grind straight or bent cutters for cross cutting paper
machines.
The carriage on which the frame cutters are to be fastened can be driven by
gear or screw wheels from the spindle O or by a spindle and gear or screw wheels,
from the driving shaft. C.
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. A grinding machine comprising in its structure, a support for the work, a
carriage mounted to slide toward and from the work support, and a swinging arm
attached to said carriage and provided with means for attaching a grinding wheel,
substantially as described.
2. A grinding machine comprising in its structure a rotary spindle forming a
work support, a carriage mounted to slide toward and from the work support, and
a swinging arm attached to said carriage and provided with means for attaching a
grinding wheel, substantially as described.
3. A grinding machine comprising in its structure a rotary spindle forming a
work-support and mounted to move laterally, a carriage mounted to slide toward
and from the work support, and a swinging arm attached to said carriage and
provided with means for attaching a grinding wheel, substantially as described.
4. A grinding machine comprising in its structure a pivotted segment, a rotary
spindle mounted in the same, and forming a work support, a carriage mounted to
slide toward and from the work support, and a swinging arm attached to said
carriage and provided with means for attaching a grinding wheel, substantially as
described.
5. A grinding machine comprising in its structure a sliding carriage, an arm
pivotally connected to the same to swing in a vertical plane, a grinding wheel
spindle connected to said arm to swing in a plane at right angles to the plane of
movement of the arm, and a rotary work support horizontally movable, substantially
as described.
6. In a grinding machine, a work support pivotted to swing in an arc, and a
wheel bearing arm pivotted to swing in a plane at right angles to the movement of
the work support, substantially as described.
7. A grinding machine comprising in its structure a work support pivotted to
swing in an arc, a carriage mounted to slide toward and from the work support,
and an arm pivotally connected to the carriage to swing in a plane at right angles
to the plane of movement of the work support, substantially as described.
8. A grinding machine comprising in its structure a work support, a pivotted
arm provided with means for attaching a grinding wheel thereto, means for
swinging said arm toward and from the work support, and an adjusting screw for
adjusting the arm, substantially as described.
9. In a grinding machine a work support, consisting in a segmental carriage T
mounted to slide in a right angle to the carriage on which the arm with the
grinding wheel is swinging.
Dated the 19th day of June 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant..