A New or Improved Machine for Cutting Parallel Slots.
Year: 1891

page_text: Date of Application, 12th June, 1891
Complete. Specification Left, 12th Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
A New or Improved Machine for Cutting Parallel Slots.
I, PIERRE HONORÉ LARCHER of Boulevard Henri IV. Paris in the Republic of
France,. Manufacturer, do hereby declare the nature of this invention to be as
follows:
This invention consists in a new or improved machine by means of which
parallel slots of the required breadth, depth, length and obliqueness or incline may
be made or cut. The improved machine is especially suitable for cutting slots in
the frame bars to receive the ends of the slats to form a fixed venetian blind. The
said bars are fixed by clamping devices on a travelling carriage adapted to be
moved by rack and pinion over a suitable bed plate a pawl taking into a row of
holes or notches holding the said carriage in the position given to it so that the
amplitude of each movement may not be exceeded and the slots cut may be at
regular distances apart according to the distances between the notches. Over the
bar is a revolving drill or tool supported in a movable headstock to revolve on a
vertical axis. The headstock is supported by a spring and may be depressed by
a foot lever its movement being limited by an adjustable stop by which the depth
of the slot cut by the tool is regulated. The tool is driven by belt gearing at a
high speed. The carriage has a desired amount of lateral movement in oblique
a direction
guides so that it may be moved under the tool for a distance and in
sufficient for the tool to cut out a slot of the length required by successive drillings
until the wood is removed from the whole length of the slot.
The same carriage may hold and move simultaneously two frame bars to be
slotted, the headstock carrying two tools; the machine may also be duplicated to
move and operate simultaneously two carriages, in conjunction with four tools, the
oblique movement of the one carriage is however preferably in a contrary direction
to that of the other carriage so that the bars are slotted in pairs, one for each end
of the venetian blind.
Dated this 19th day of June 1901
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
A New or Improved Machine for Cutting Parallel Slots.
I, PIERRE HONORÉ LARCHER of Boulevard Henri IV. Paris in the Republic
of France, Manufacturer do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
This invention consists in a new or improved machine by means of which.
parallel slots of the required breadth depth length and obliqueness or incline may
be made or cut.
The improved machine is especially suitable for cutting slots in
the frame bars which are to receive the ends of the slats to form a fixed venetian
blind.
In the accompanying drawing
Fig. 1 is a side elevation of a machine constructed to operate simultaneously on
two pairs of such frame bars.
Fig. 2 is a plan of the under frame thereof.
Fig. 3 is a vertical cross section.
The machine may be constructed to cut the slots of fixed venetian blinds of
PQ/1

page_text: different systems, but as illustrated it is adapted specially for cutting out slots
closed at the ends and shaped to receive flat slats with rounded edges.
The slots are cut by a tool of the same diameter as the breadth of the slot to be
cut, and revolving at a rate of about 3200 turns a minute.
The rotary movement is communicated from a shaft A in the basement parallel
with the length of the machine, by a belt passing over the fast and loose pulleys B
and over the fast and loose pulleys C, thence under the pulley D and back over
the fast and loose pulleys C' to the pulleys B. The pulleys C are mounted on the
end of a shaft, horizontal but perpendicular to the shaft A, they drive the two
tools H by a strap passing over the wooden drum P and the two metallic
spindles EE on the one side of the machine. The pulleys C¹ drive the tools H
in a similar manner on the other side of the machine. Three belt forks permit the
operator to work either pair of tools separately or set both out of engagement,.
the fork T being in proximity to the pulleys B, the fork S in proximity to the
pulleys C and a similar fork to S in proximity to the pulleys C. Each pair of
tools is mounted in a frame F sliding vertically in guides G. The spring J tends
to raise the frame F, the stop U limiting the upward movement.
The frame is
pressed down by a pedal L connected to the frame by rod K, and by this
movement holes are drilled by the tools H in the wooden frame bars placed under
the said tools. The screw may be adjusted to limit the downward movement of
the frame F so that the holes shall be of the required depth. As the axis of the
tools is perpendicular to the belt gear the movement of the tool frame does not
influence adversely the transmission of power. The frame X supports the tool
frames F and the devices for holding the bars to be slotted.
On each side of the machine the bars a a to be slotted are clamped against the
carriage which is adapted to slide upon the guiding plate d. The metallic
clamps c hold the bars a a. in place on the carriage and the latter is fixed in
position on the guiding plate d by a spring pawl or finger taking into recesses in
a wooden bar. The carriage & may be moved on the plate d when the pawl h
has been disengaged, by a hand wheel with pinion engaging in a rack 9 on the
carriage b.
l
The guiding plate d has but a limited movement on the bars e of the frame X.,.
this movement being oblique according to the obliqueness of the slots to be cut.
The plate d is guided by two webs simply of T iron n sliding in two grooves o in
the bar e.
The movement is caused by a hand wheel with pinion m taking into a
short rack on the plate d.
The amplitude of movement of the plate d is limited by two set screws q.
These are mounted in the two blocks p which prevent the plate d from lifting from
its seating, while opposing no obstacle to its sliding movement.
The operation of the machine is as follows;-The bars a are clamped and the
pawl engaged in a recess in the bar f. The workman seated at the side of the
machine revolves the wheel m moving the plate d, and carriage b with it, against
the stop pressing on the lever L the tools H piece the holes at one end of the
slots, releasing the lever L from pressure he moves the plate d with carriage b
against the other stop and pieces the holes at the other end of the slots; moving
the plated backwards and forwards and continuing to press on the lever L he
removes the wood along the whole length of the slots; until the pair of slots is
finished. The pawl is then released and the carriage b moved by rack and
pinion g. I until the pawl h falls into the next recess in the bar f. The next pair
of slots is then cut in like manner. The operations are continued until all the
slots are cut.
The racks i and 9 are wide enough to remain engaged with their pinions in all
positions of the plate d.
The breadth of each slot is according to the diameter of the tool, the depth of
slot is regulated by screw r, the length of slot by screws qq, the obliquity of slot
by the choice of grooves o o' and the distance from slot to slot, by choice of a
corresponding bar or template f. with corresponding distances between its recesses.

page_text: 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 1
claim is
A slotting machine adapted to cut a number of parallel slots of equal depth
breadth, length and obliquity in one or more bars of wood or other material in
pairs or otherwise by means of mechanism as herein described.
Dated this 12th day of October 1891.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.