AN IMPROVED COILING MACHINE
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said Charles Leigh Clarke and
John Leigh at the Office of the Commissioners of Patents on the 28th March
1882.
CHARLES LEIGH CLARKE and JOHN LEIGH both of Manchester in the County
of Lancaster "AN IMPROVED COILING MACHINE."
This invention consists of improvements upon the coiling machine for making
induction and resistance coils for electric appliances, for which Letters Patent were
granted to us bearing date the 22nd day of August A.D 1881. No. 3652; the
object of our present invention being to simplify the construction of the machine,
and to render it more automatic, so as only to require one attendant.
In place of using the long screwed spindle, with a screw thread only in one
direction, and providing an arrangement of gearing and other mechanism for
reversing the direction of its revolution we now employ a shorter spindle, ono
half of which has a right hand screw thread, and the other half a left hand screw
thread cut upon it.
This right and left hand screwed spindle is driven in one direction only by a
spur wheel and pinion from the driving shaft, and I provide the guide rod with a
swing-bracket each end of which has fixed thereto a half nut, one of which corres-
ponds with the right hand screw thread and the other with the left hand screw
thread; so that as the guide rod, with its bracket, is rocked either forwards or
backwards one of the said half nuts will be brought into gear with its corresponding
screw (and the other out of gear) and thus the guide rod will be moved to the
right or left as the case may be.
At a part of the guide bar opposite to about the centre of the screwed spindle is
fixed an arm which works between two springs, and the end of this arm is provided
with a V-shaped point working across a reversed V-shaped guide plate.
As the guide bar moves to the right, the end of the arm above named passes
over the top of the guide plate which supports it, keeping the right hand half nut
in gear with its screw, and raising the right hand spring, which then exerts a
downward pressure on the arm, and as soon as the pointed end of the latter passes
over the inclined edge at the right side of the guide plate the spring forces the

page_text: arm downwards, so as to rock the guide bar and bring the left hand half nut into
gear with its screw, and the right hand half nut out of gear, and thus reverse the
action of the guide bar. The point of the arm now comes back under the guide
plate which holds the left hand half nut in gear, and the arm presses down the left
hand spring which, as soon as the point of the arm passes the left hand edge of the
guide plate, forces it up again, and so on alternately. The length of the traverse
of the guide before reversing is adjusted by advancing or withdrawing the guide
plate, so as to present a wider or narrower part thereof for the point of the afore-
said arm to pass over.
In order to allow the attendant time to place the paraffine papers between each
coil, the machine is provided with a strap fork and the guide bar is fitted with
two fingers which, at the end of each traverse, release a spring-catch and allow a
weight to move the strap fork so as to throw the strap onto the loose pulley and
at the same time to apply a break to the hand wheel.
As soon as he has placed on the paraffine paper he moves a lever which releases
the break and raising the weight throws the strap onto the fast pulley.
The other parts of the machine are similar to that described in the Specification
of the Letters Patent before mentioned.