Year: 1885

page_text: I, PAUL JAHN, of Meuselwitz, in the German Empire, Manufacturer, do hereby
declare the nature of this invention, to be as follows:-
--
The planing machines, hitherto in use, have the great drawback, to require
several driving pulleys namely one for slow and one for fast travel and one loose
pulley, the strap or both straps being pulled to and fro from one pulley to the other
by the reversing forks, and consequently subject to rapid wear and tear. Also
these pulleys are in most cases situated in the middle of the machine, whereby the
planing of broad pieces is rendered impossible.
The improved planing machine is provided with but one driving pulley which is
arranged behind the machine stand and therefore allows broad pieces of work to be
fixed in the machine and planed.
The pulley serves for slow as well as for fast travel, for which purpose the
machine is provided with a peculiar reversing gear.
On the axle of the driving pulley are situated two loose spur wheels and a
coupling situated between the latter, which coupling is connected with the axle by
a groove and feather so that it can be shifted along the axle but not turned on the
same. The coupling is furnished on both sides with claws, which gear alternately
into the two spur wheels and thereby couple the same with the driving axle. The
planing or slow travel takes place when the coupling is connected with the smaller
one of the two spur wheels, thus causing the latter to revolve with the axle. The
layer spur wheel gears with another spur wheel, on the axle of which is situated
a spur wheel which gears into a spur wheel mounted on the axle which carries
another spur wheel gearing into the toothed wheel or pinion which sets in motion
the toothed rack of the table of the planing machine and thereby moves the latter.
Two adjustable catches are so secured near opposite ends of the table that, when
the table arrives at the termination of its travel one of the catches abuts against
a slide and shifts the same to the right. With the slide is connected å bolt
projecting into a grooved steering disc or sleeve mounted on a horizontal shaft on
which are also mounted a bevel wheel (for producing the feed motion of the tool)
and a reversing lever. This lever is connected by an intermediate piece with a
guide rod on which is mounted a reversing fork. When the slide is shifted with
its bolt to the right, the bolt turns the grooved sleeve, together with its shaft and
the reversing lever. The guide-rod with the fork is thereby displaced and by the

page_text: fork the clutch coupling is withdrawn from the large spur wheel and shifted into
the small wheel so that the former becomes loose, and the latter is coupled with the
axle. The small wheel gears directly into a spur wheel mounted on the shaft of
the wheel which turns the pinion of the rack and thus causes the quicker back
travel, until the opposite catch abuts against the said slide whereby the grooved
disc. is turned the opposite way and the coupling is reversed. To cause the
coupling to be effected exactly and quickly, a weighted lever is mounted on the
shaft of the grooved disc. When the said weight has got beyond its highest
position by the revolution of the shaft, it falls rapidly and likewise turns the shaft
rapidly, whereby an energetic action of the coupling is produced.
By a modification of the machine the small spur wheels on the shaft of the
coupling fork is provided with a friction coupling. By withdrawing the coupling
from the opposite or large wheel, the friction cone of the coupling is pressed into
the corresponding hollow of the spur wheel by a strong spring, and this wheel is
set in motion. By introducing the coupling into the large spur wheel the spring
is allowed to expand and release the connection of the friction cone with the spur
wheel.

page_text: I, PAUL JAHN of Meuselwitz, in the German Empire, 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 planing machines, hitherto in use, have the great disadvantage of requiring
several driving pulleys, namely one for slow and one for fast travel and one loose
pulley, the strap or straps being pulled to and fro from one pulley to the other by
the releasing forks and consequently subject to rapid wear and tear. Also these
impulsion pulleys are in most cases situated in the middle of the machine; whereby
the planing of broad pieces is rendered impossible.
The improved planing machine, represented by the annexed drawing is provided
with but one driving pulley which is arranged behind the machine stand and
therefore allows broad pieces of work to be fixed in the machine and planed.
The pulley a serves for slow as well as for fast travel for which purpose the
machine is provided with a peculiar reversing gear.
On the axle a of the driving pulley a¹ are situated two loose spur wheels b and c
Fig. 2. and a coupling i, situated between the latter, which coupling is connected
with the axle a by a groove and feather, so that it can be shifted along the axle,
but not turned on the same. The coupling is furnished on both sides with claws,
which gear alternately into the two spur wheels and c and thereby couple the
same with the driving axle a. The planing or slow travel takes place when the
coupling i is connected with the spur wheel b thus causing the latter to revolve
with the axle a. The spur wheel b gears into another spur wheel d on the axle of
which is situated a spur wheel e which gears into a spur wheel f. mounted on the
axle which carries another spur wheel g gearing into the toothed wheel or pinion h
which sets in motion the toothed rack of the table of the planing machine and
thereby moves the latter. Two adjustable catches and u are secured near
opposite ends of the table so that when the table arrives at the termination of its
travel, one of the catches / abuts against a slide m and shifts the same to the right.
With the slide m is connected a bolt n projecting into a grooved steering disc or
sleeve o mounted on a horizontal shaft p, on which are also mounted a bevel
wheel q for producing the feed motion of the tool, and a reversing lever r.
This
lever is connected by an intermediate crank s with a guide rod t on which is
mounted the reversing fork k. When the slide m is shifted with its bolt n to the
right the bolt n turns the grooved sleeve o together with its shaft p and the
reversing lever r. The guide rod t with the fork k is thereby displaced, and by
the fork k the clutch coupling i is withdrawn from the spur wheel b and shifted
into the spur wheel c, so that the former becomes loose and the latter is connected
with the axle. The spur wheel c gears directly into a spur wheel mounted on
the shaft of the wheel which turns the pinion of the rack and thus causes the
quicker back travel, until the opposite catch u abuts against the slide m, whereby
the grooved disc is turned the opposite way and the coupling is reversed. To
cause the coupling to be effected exactly and quickly, a weighted lever 2 is
mounted on the shaft p. When the said weight has passed its highest position by

page_text: the revolution of the shaft p, it falls rapidly and likewise turns the shaft p. rapidly
whereby an energetic action of the coupling is produced.
Figs. 4. 5 and 6 show a modification of the machine by which the spur wheel o
on the shaft of the coupling fork is provided with a friction coupling. By with-
drawing the coupling from the opposite wheel b, the friction cone c¹ of the coupling,
is pressed into the corresponding hollow of the spur wheel c by a strong spring
and this wheel is set in motion. By introducing the coupling i into the spur
wheel b (Fig. 6) the spring is allowed to expand and releases the connection of the
friction cone c' with the spur wheel c. As shown in Fig. 4ª a double friction clutch
may be used in place of the above if desired.
With these latter arrangements the weighted lever & may be dispensed with.
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;-
1. In planing machines, a single driving pulley placed at the side of the machine
combined with an automatic reversing contrivance substantially as described.
2. The automatic reversing gear consisting of two spur wheels b c running
loosely on the driving shaft and adapted to be alternately connected with the
latter by a toothed or friction coupling substantially as and for the purpose
described.
3. The device for automatically actuating the coupling i, consisting of the
catches and u, secured to the table, and abutting at the termination of their
travel against the slide m, the bolt n of which turns a steering sleeve o with
shaft p which carries the lever r with or without the addition of the weighted
lever, said lever r being connected with rod t and coupling fork k, so that the
rod t and fork k and therefore the clutch i are displaced when the slide m is
operated.
Dated this 19th