Improvements in Automatic Dovetailing Machines.
Year: 1889

page_text: Date of Application, 2nd Nov., 1889-Accepted, 21st Dec., 1889
COMPLETE SPECIFICATION.
Improvements in Automatic Dovetailing Machines.
JOHN ANDERSON 38 Elswick Row Newcastle on Tyne Engineer 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 :-
This invention relates to improvements in machines used by cabinet makers and
joiners for Dovetailing drawers, boxes and similar other work, and consists of a
suitable frame with spindles mounted on slides and revolving at high speed, and
fitted to receive cutters of any size and shape. Also shafts, cranks, cams, and levers
for the various motions. When dovetailing the wood is secured in a carrier mounted
in a horizontal slide fixed on the frame and propelled forward at regular intervals by
levers, and controlled by pawls while the cutters are being drawn into the wood and
withdrawn for each consecutive cut. I will now explain my invention more in detail
by referring to letters and figures on the accompanying Drawings.
Fig. 1. is a front elevation showing section of the carrier with the wood held in
position for dovetailing.
Fig. 2 is a side view showing position of cutter spindles and working parts for
controlling the carrier.
Fig. 3 is a plan showing position of cutter spindles on the lateral slide and other
parts. A is the main shaft for imparting the various motions, and is driven by
worm gearing B and belt cone C, and with the crank pin D operating in the female
cam E pivoted at F receives a quick return motion, and being connected by a rod
indicated by dotted line G to the cross slide H which carries the cutter spindles J.
The screw I is for adjusting the throw of rod G and with it the cutters for the
various thickness of wood. The crank pin D being at the lower end and nearest the
fullerum of cam E and revolving right hand throws the cutters from the wood, while
at the same time the taped cams K acting upon the levers L and M Fig. 3 draws the
pawl N from the division rack O having been kept in the rack by a spring N¹ Fig. 2
while the lever P with pawl P' attached to lever M, Figs. 2 and 3 engaging in the
rack O. moves the carrier forward for the next cuts. All the spindles operating at
the same time, thus making a series of complete dovetails at each revolution of
shaft A. The central spindle is fixed on the slide and those on either side are adjust-
able by screws g, for any size of dovetails. The depth of cuts are regulated by
screw Rand arm S which is attached to the slide which carries the spindles and
vertically by lever T and band wheel U which lifts or lowers the frame carrying the
cross slide with the spindles. The carrier is fitted in a slide bed W fastened upon
the main frame. Thus the carrier is perfectly rigid in operation, and the wood V is
held firmly by clamp bars X while the cutters travels through the vertical into
the horizontal peice the required distance. By removing the slide bed W with the
carrier, a plain table may be put on thus making a double spindle moulding
machine.
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
1st. The arrangement whereby a series of cutters are operating in one carrier
automatically for dovetailing.
2nd. Cam E in combination with cross slide H and cutters J for dovetailing
machines substantially as shown and for the purpose set forth.
T
1000