Improved Rotary Veneer Cutting or Wood Paring Machine.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improved Rotary Veneer Cutting or Wood Paring Machine.
We OSCAR FLECK and RICHARD FLECK Manufacturers, trading as C. L. P. Fleck
Söhne and WOLFGANG SCHRADER Engineer all of 31 Chaussée Strasse, Berlin, Prussia,
in the Empire of Germany, 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 process of cutting or paring a continuous sheet of wood, a veneer or board,
from a cylindrical block by a straight knife, can be accomplished in several different
ways.
The object of the present invention is based upon that process in which the wood
block rotates around its axis against the edge of the knife, the block moving to and
fro, preferably at the same time, in a plane parallel to the knife edge, and in which
the knife moves automatically straight forward towards the axis of the block, and the
invention consists in a machine carrying out this process in a new and improved
manner.
:-
In the accompanying drawing representing this new machine :-
Figure 1 is a front elevation.
Figure 2 is a plan.
Figure 3 is a vertical cross section.
Figure 4 shows an elevation of the block frame as seen vertically to the cross
beams.
Figure shows, on a smaller scale, the block frame oscillated by device
equivalent to that shown in figure 4 for the same purpose.
The block B is clamped between two axial spindles, 663 by means of claws k. k,
fastened to the inner ends of the said spindles, which latter take their bearings in
the head stocks C and C. The spindles 2, 3, and with them the block B, are
rotated by the toothed gears a. b. and a 6, of which the pinions a. a¹, are mounted
upon the driving shaft of the machine and the wheels b. upon the spindles
3.
The block B receives an oscillating or to and fro motion, parallel to the edge of
the cutting knife, by a mechanical contrivance of peculiar construction, and which
may be used advantageously with suitable variations in other veneer cutting or wood
paring machines. We consider this contrivance a very valuable part of our invention,
and claim it as such.
The spindles do not turn directly in the head stocks C. 01, but indirectly
with the sleeve hubs of the wheels b. 6, which surround the spindles like a sleeve.
The spindles may slide in axial direction inside the hubs of the wheels b. b¹, but
are caused, by feather and groove or any other suitable device, to turn round with
the rotating wheels. When the claws k. are pressed tightly into the block B, they
form, together with the spindles 62 63, a rigid shaft or spindle or a kind of solid thrust
shaft.
The spindle 63 rests, with a central thrust plug, against the end of the screw s¹, the
cross beam serving as its nut. From the ends of the cross beam g¹ extend two
rods p and p¹ to the end of a second cross beam q, so that the two cross beams q. q',
with the two rods p. p', form a rigid frame.
The right hand portion of the spindle 62 is screw threaded, and a hand wheel &
works as a nut on it. This nut is coupled with a sleeve or tube 6*, closed on its free
end, which rests with a thrust plug against the cross beam q. The sleeve can slide
along the screw portion of the spindle when the hand wheels is turned either way,
but it is prevented from rotating round the spindle by feather and groove or any other
suitable device:
It will be readily seen that the spindles 62 63, with the block B and the, frame, form

page_text: a self-sustained system, in which all the forces employed are self contained. No other
parts of the machine consequently are strained by the clamping of the block.
Another advantage is that the thrust plugs can be made of small diameter, and that
they therefore cause a minimum of friction.
One of the rods p. p of the frame g¹ p. q. p' is connected prismatically with the
two head stocks, the whole frame therefore can be only axially shifted; on the other
hand, the spindles, being lodged inside the frame with their wheels and sleeves
forming with the wood block in the locked state, one kinematic link, can perform the
rotating motion. The construction is such that the one element, consisting of the
spindles and block, is capable of rotary motion and dependently or independently
on it, the frame, the oscillating or to and fro motion.
It is clear that the frame may be moved in such way by any suitable mechanical
contrivance capable of producing an oscillating or to and fro motion.
In the present case the following arrangement is employed. Upon the sleeve is
fastened the cylindrical disc e', the axis of which is inclined to that of the spindle b²,
and in such manner that the angle of inclination can be altered from Zero to any
desired angle. This oblique dise is surrounded by a cylindrical ring c, attached by a
ball and socket joint g. to the framework of the machine, in such manner that the
socket can be adjusted in vertical direction, but is immoveablo in horizontal direction.
By this kind of connection, the desired motion is obtained, but we do not confine
ourselves to the use of this contrivance; other suitable apparatus may, as above
mentioned, be substituted therefor, such for instance, as that shown in figure 5.
To bring the knife, during the cutting, gradually nearer to the wood block, the knife
is mounted upon a slide rest P, which is mounted on guides carried by the frame
work C. C of the machine, and can be shifted toward the main axis of the machine.
To the slide rest P are fixed the nuts of two screws s² 3, which find their bearings in
the body of the machine, and are rotated by two sets of worm wheels and worms or
screws a² 6 and a³ ³. These screws a a³ are driven by chain wheel gear a b² c6, of
which a is mounted upon the driving shaft of the machine by means of a train of
toothed gearing a³.
It is clear that the arrangement of gearing may be altered, and also that one or
other of them may be replaced by any other kinematically equivalent thereto. For
instance, instead of chain wheels, tootbed wheels may be employed; instead of
toothed gearing, friction or other gear may be used.
The screws 3 turn in bearings carried by the body of the machine, which are
arranged in such manner that the strain caused by the pressure against the wood
block is transferred as much as possible directly from the knife to the screws. This
is accomplished by the screws not transferring the strain to the body of the machine,
but by two ring heads K K to the above mentioned elongated hubs h¹². The
pulling force exerted by the screws is transferred through the hubs h¹³,
surrounding sleeve-like the spindles 6263, to the latter and from them by the claws k. k³,
to the wood block. The slide rest, the screws s² 3, the spindles 6263 with their
sleeves h¹³, and the wood block, form therefore a closed system of kinematic links
or connections in which the forces nearly compensate each other without straining
materially the body of the machine.
A further peculiarity of the present machine consists in the knife carrier not
forming as in other veneer cutting or wood paring machines one piece with the slide
rest but being so attached to the latter, that it can be removed from it after having
loosened two binding screws. For this purpose the knife support is provided with a
loop into which the hook of a tackle can be hitched.
This arrangement is of great advantage as the putting in of the knife is performed
without danger notwithstanding the great weight of such knives. In machines as
hitherto built the changing of the knives is always tedious and for the workmen a
dangerous operation.
The adjusting of the thickness of the veneer or board is effected at the slide rest
by an adjustable pressure bar the construction of which is well known and therefore
not claimed.

page_text: Having now particularly described and ascertained the nature of our said
invention, we declare that what we claim is
1. A rotary veneer cutting or wood paring machine in which the wood block makes
automatically a rotating motion around its axis and a motion parallel to the knife
edge and the knife a rectilinear motion toward the axis of the block substantially as
shown and described and for the purpose set forth.
2. The construction of the clamping frame in such manner that it is connected
prismatically with the body of the machine and so arranged that it contains the
spindles and the block as a thrust shaft, whereby the forces created by the clamping
of the block are compensated in the frame, and whereby no difference is caused if the
frame is shifted or not in the machine during the working substantially as described
and shown and for the purpose set forth.
3. The arrangement of the screws actuating the slide rest in such manner as to
transfer the pressure of the knife against the wood block from it by the spindles
directly again to the screws.
4. The construction of the divided frame like knife carrier so that the knife carrier
proper forms one element of the frame and can be readily changed or removed
substantially as shown and described and for the purpose explained.
C. L. P. FLECK, SÖHNE,
By Harris & Mills,
23, Southampton Buildings, Agents.
Dated is word way i may
C. L. P. FLECK, SÖHNE,
By Harris & Mills,
23, Southampton Buildings, Agents.