Improvements in Quick Return Movements for Planing and other Machines.
Year: 1897

page_text: Date of Application, 7th July, 1897-Accepted, 18th Sept., 1897
COMPLETE SPECIFICATION.
Improvements in Quick Return Movements for Planing and other
Machines.
I, FREDERICK WILLIAM GOLBY, of 36 Chancery Lane, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, as communicated to me b Wilhelm
Hinrikus Arcona, Watchmaker, of 37 and 37: Bahnhofstrasse, Hemelingen,
Hanover, Germany, to be particularly described and ascertained in and by the
following statement:―
This invention relates to a mechanical contrivance to be applied to machine
tools, in which a quick return movement of the implement is necessary in
connection. with a slow uniform working motion, for example planing machines,
grooving machines, stamping machines, presses, etc. This new mechanica con-
trivance can be easily connected with the machine tool gear in machines of the
kind, it being introduced between the main-shaft and the working shaft.
As the arrangement differs according to the nature of the machine to which it
is applied, the contrivance only is illustrated in the accompanying drawing, in order
that the matter may be more briefly and more generally dealt with in the
specification
Pigs. 1 and 2 represent longitudinal vertical sections of the mechanism in two
different positions which explain the mode of operation. Fig. 3 is an enlarged
detail view.
The shaft is the driving shaft of the particular machine, whilst that of the
wheel m, (which is only indicated in the drawing) may be the driving shaft of the
implement. Between these two shafts the contrivance illustrated in the drawing
is introduced.
On the driving shaft of the machine is keyed a toothed wheel i to which is
rigidly connected a ratchet wheel k with which gears a pawl ¹ secured to a toothed
wheel which is loose on the said shaft h but secured against axial sliding and
engaging with a driving wheel m firmly secured to the implement driving shaft.
The wheel i engages with a toothed wheel which carries a pin f' on its face and
is free to rotate on a stud g. In the path of this pin f' is arranged the driver or
tappet 2 of a sliding piece a which is guided in the slots a¹ of the frame and is
under the influence of a spring e so that if f be rotated in the direction of the
arrows, Figs. 1 and 2, this driver or tappet a², and therewith the sliding piece a
itself, will move in the direction of the arrow shown in Fig. 1 and the spring e
will be thereby stretched.
A toothed rack b is linked to the sliding piece a, which is out of engagement
with the loose wheel 7 during the movement just described but engages therewith
as soon as the pin of the wheel of leaves the tappet a³. For this purpose the
toothed rack which is constantly pressed downwards by a spring c is provided
with lateral pins d which guide it in the U-shaped grooves d¹ formed in the frame,
the parallel parts of which grooves are connected by an inclined groove at the
rear the front being however provided with a sliding tongue or switch d³ (see
Fig. 3), which is automatically displaced by the guiding pin d and prevents said

page_text: pin from passing in different directions through one and the same of the parallel
parts of the grooves d'; the guiding pins d are by the switch forced to make the
movement that corresponds to the stretching of the spring in the upper groove
and the opposite movement in the lower groove, so that, the toothed rack b is out
of engagement with the wheel during the first course or movement, but in
engagement therewith during the return movement, as shown in Figs. 1 and 2.
The action of the mechanism is as follows:-The driving shaft h and therewith
the toothed wheel i and the ratchet wheel k rotate at an uniform or constant. rate
of speed, the last-named transmitting this motion by the aid of the pawl ¹ which
is firmly attached to the loose wheel to this wheel itself, whilst the driving
wheel i sets the wheel f in similar uniform motion and thereby effect's the left-hand
and in-effective movement of the. toothed rack. This part of the motion corre-
sponds with the working movement of the implement. As soon as this is finished,
the implement should execute the return movement as quickly as possible. This
is effected by, the mechanism above described. The toothed rack 6 immediately
after it is orought into engagement with the wheel 7, which latter gears with the
wheel m, loses its point of support, the pin 'f¹ on the wheel f, and so is caused to
move back by the spring e, thus setting the wheel 7 in quicker rotation in the former
direction, which may occur without detriment to the uniform further motion of
the rest of the mechanism, as the pawl k glides over the teeth of the ratchet. wheel
without engaging. In consequence of the continual further motion of the driving
wheel the operation is repeated in the same manner.
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:
Mechanism for effecting a periodical quicker motion in connection with an
uniform motion consisting of a fixed toothed wheel i mounted on a driving shaft h
and a loose driving wheel 7 a ratchet and pawl arrangement k k coupling these
two wheels, a toothed rack gearing with the loose driving wheel 1, closed guiding
grooves d' in the walls of the frame, the sliding tongue or switch d which separates
the parallel parts of the said guiding grooves, the pin d, on the toothed rack b
for guiding the latter in the grooves d' and for reversing the sliding
tongue or switch d², a spring e, a sliding piece a sliding in guides a¹
in the frame and connected to the spring e and toothed rack b and
carrying a tappet as in the path of the pin on the wheel f; which pin moves the
sliding piece à and therewith the toothed rack b, by means of the driver or
tappet a against the action of the spring e, all arranged to operate substantially
as described and illustrated in the accompanying drawings.
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