Improvements in or connected with Doffing Combs for Carding Engines.
Year: 1890

page_text: Date of Application, 15th Aug., 1890
Complete Specification Left, 2nd May, 1891-Accepted, 23rd May, 1891
PROVISIONAL SPECIFICATION.
Improvements in or connected with Doffing Combs for Carding
Engines.
1 THOMAS BARKER of 11 Henry Street Bolton in the County of Lancaster
Manager do hereby declare the nature of this invention to be as follows :—
The object of my invention is to increase the beats of the doffing comb used in
stripping the material from the doffer cylinder of carding engines in such a manner
as to give two distinct beats of the doffing comb for cach revolution of the crank or
eccentric which drives the said doffing comb, thereby doubling the speed of the
said doffing comb, without increasing the speed of the said crank or eccentric.
In place of the ordinary crank or eccentric and usual connexions, whereby
at present it is only possible to get one beat of the comb, for one revolution of the
crank or eccentric, I propose to use a crank or eccentric in connection with a fork
or slotted lever, or connecting rod, which is hinged on a fixed centre. This said fork
or slotted lever, or connecting rod is caused to oscillate on the fixed centre by the
action of the aforesaid crank or eccentric.
On this said fork or slotted lever, or connecting rod, is hinged a second connecting
rod or link. This second connecting rod or link is also linked or hinged on the
crank or lever which is fixed or attached, to the dofting comb shaft.
The effect is when the three centres viz. -the fixed centre, and the two centres
of the second link are all three in one straight line, the doffing comb will be at the
extreme end of its stroke, and by deflecting the inner of the three centres from the
straight line on one side, by the oscillation of the aforesaid fork or slotted lever or
connecting rod, and back again to the straight line, one complete beat of the doffing
comb is made, which will require only half a revolution, of the aforesaid crank or
eccentric. The other half of the revolution of the crank or eccentric, will deflect
the inner centre in the opposite direction from the straight line, which will give
another complete beat of the doffing comb, thus giving two complete beats of the
doffing comb for one revolution of the aforesaid crank or eccentric.
Or I can deflect the inner centre by another link or connection working on an
eccentric in place of the fork or slot in the aforesaid oscillating lever or by a
multiplication of the above arrangement I can get four or more beats for one
revolution of the aforesaid crank or eccentric.
August 14th 1890.
THOMAS BARKER.
COMPLETE SPECIFICATION.
Improvements in or connected with Doffing Combs for Carding
Engines.
I THOMAS BARKER of 11 Henry Street Bolton in the County of Lancaster
Consulting 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 :-
22
The object of this invention is to increase the beats of the "
doffing comb used
in stripping the material from the doffing cylinder of carding engines, in such a
manner as to give two distinct beats of the comb for each revolution of the crank or
excentric which drives the said doffing comb, without increasing the speed of the
said crank or excentric.
The nature of my said invention and the manner in which the same is to be

page_text: performed or carried into practical effect will be readily understood on reference
to the two sheets of drawings hereunto annexed and the following description
thereof.
Fig. 1 (Sheet 1) represents an elevation of my improved apparatus with one side
of the box or casing thereof removed, and
Fig. 2 (Sheet 2) is a plan view of the same with the box or casing shown in
section.
I may here observe that I make this casing A by preference in the form of a
liquid tight box as shown, so that the apparatus which is required to run at a high
velocity may work partly immersed in oil, and for the purposes of my invention
I also prefer to make the bearings (or some of them) conical in form as
represented.
A is the doffing-comb shaft, B the position of the doffing comb, C, the doffing
comb crank, Cits counterweight and D its crank pin which is connected by a short
link E (counterbalanced at E¹) to a pin F.
In place of the ordinary crank or excentric and usual connection whereby at
present it is only possible to get one beat of the comb for each revolution of the
crank or excentric, I propose to use a crank K (or an excentric) attached or cast
on a conical spindle J and running on a conical pivot J, the crank pin working
through a step-piece L sliding in the groove or slot of a fork or slotted lever G
which is counterbalanced at G and swings on a fixed centre H.
The said fork or slotted lever G is caused to oscillate on the fixed centre H by
the direct action of the aforesaid crank K which latter is driven by an endless cord
or band passing round the grooved pulley K.
The fork or slotted lever G is hinged at F to the connecting link E the other
end of which is hinged at D to the crank or lever C attached to the doffing comb
shaft A¹.
The effect of this arrangement is that when the three centres, viz. the fixed
centre and the two centres D and F of the link E are all in one straight line (as
shown at Fig. 1.) the doffing comb B will be at the extreme end of its stroke, and
by deflecting the inner one of the three centres from the straight line (either
upwards or downwards) by the oscillation of the fork or slotted lever G, and back
again into the straight line, one complete beat of the doffing comb B is made; and
each beat of the said comb will only require half a revolution of the crank K or the
excentric, and the other half revolution of the same will deflect the centre F in the
opposite direction from the straight line which will give another complete beat of
the doffing comb B; thus giving two complete beats of the latter for each revolution
of the crank or excentric.
By a multiplication of the above arrangement I can get four or more beats for
each revolution of the crank if desired.
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
The combination of a crank or excentric working in the groove or slot of a fork
or slotted lever oscillating on a fixed centre, with a link connecting such fork or
slotted lever to the doffing comb crank, all constructed arranged and operating
substantially as and for the purpose herein before described and illustrated by the
drawings annexed.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.