Improvements in Alarm Devices for Indicating the Breaking of the Web in Paper Making and similar Machines."
Year: 1897

page_text: Date of Application, Tɔth Feb., 1897
Complete Specification Left. 15th Nov., 1897-Accepted, 18th Dec., 1897
Date of Application, roin red., 1897
Complete Specification Left. 15th Nov., 1897-Accepted, 18th Dec., 1897
Improvements in Alarm Devices for Indicating the Breaking of the
Web in Paper Making and similar Machines."
I, JOHN STEWART NAPIER, of Herbertshire, Denny, in the county of Stirling,
Paper Manufacturer, do hereby declare the nature of this Invention to be as
follows:-
This Invention has for its object to provide a simple and efficient device for
automatically warning the machineman of the breakage of the web of paper
produced in and passing through a paper making machine or paper drying or
similar machine.
The improved alarm apparatus comprises an electric bell or bells and battery
placed in any convenient position in proximity to the machine and conductors
led from the positive and negative elements of the battery to terminals situated
over the stretched web of paper as it passes from the press rolls or from any one
section of the machine to another. One of the terminals is stationary and the
other is formed by or on the pivot or centre of a lever, one end of which rests
on the paper passing through the machine whilst the other end extends to but
is normally out of contact with the stationary terminal. The arrangement is
such that immediately the web of paper breaks the lever being left unsupported
at its lower end tilts or moves so that contact is made between its upper end and
the stationary terminal whereby the electric circuit through the battery is closed
and the alarm bell rung.
In order to avoid the necessity of breaking the circuit by hand to stop the
ringing of the bell with the attendant risk of omitting to reset the device,
provision may be made for automatically cutting out the bell after it has given the
alarm, by means of conductors and a similar lever arrangement placed nearer
the reeling end of the paper making machine according to the length of time
the bell is required to ring, and which lever would break the circuit on the broken
end of the web passing it. When the fresh web of paper is again passed over the
machine this lever would close the circuit and the alarm bell be free to act.
An alternative method of automatic cut off which would suit some paper
making machines better than the previous is as follows: --One of the leading or
guide rolls on the paper making machine is supported by springs in suitable
brackets (as usually in use on a paper making machine) suitable electric con-
nections being fitted to roll journal and bracket. The strain of the paper passing
over this roll compresses the springs thus closing the circuit. On the broken
web end reaching this roll the strain is removed and the springs expand to their
normal position thus breaking contact and stopping the bell. When the fresh
web of paper is again passed over the machine the renewed strain on the roll
would again close the circuit and the alarm be free to act.
thin 12th day of February 1897.
WALLACE FAIRWEATHER
of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
t Vincent Street, Glasgow. Agent for the Applicant.

page_text: "Improvements in Alarm Devices for Indicating the Breaking of the
Web in Paper Making and similar Machines."
I, JOHN STEWART NAPIER, of Herbertshire, Denny, in the County of Stirling,
Paper Manufacturer, 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 has for its object to provide a simple and efficient device for
automatically warning the machineman of the breakage of the web of paper
produced in and passing through a paper making machine or paper drying or
similar web making or manipulating machine.
The Invention is illustrated by the accompanying drawings, figure 1 being a
side elevation, figure 2 an end elevation and figure 3 a plan of the improved alarm
device. Figure 4 shews the alarm device as applied to a paper making machine.
The improved alarm apparatus comprises an electric bell or bells A and battery
B placed in any convenient position as shewn at figure 4 in proximity to the
machine, and conductors C, D, led from the positive and negative elements of the
battery to terminals E, F, situated over the stretched web of paper as it passes
from the press rolls or from any one section of the machine to another. The
terminal F, as shewn at figures 1, 2 and 3, is stationary and the other terminal E
is formed on a metallic lever G or on its pivot, one end of the lever resting on the
paper H passing through the machine whilst the other end extends to but is out
of contact with the stationary terminal F. The arrangement is such that
immediately the web of paper breaks, the lever G being left unsupported at its
lower end tilts or moves so that contact is made between its upper end and the
stationary terminal F whereby the electric circuit through the battery B is closed
and the alarm bell A rung.
In order to avoid the necessity of breaking the circuit by hand to stop the
ringing of the bell A with the attendant risk of omitting to reset the device
provision may be made for automatically cutting out the bell after it has given
the alarm, by means of conductors and a similar lever arrangement as shewn at
I, fig. 4, situated in the circuit and placed nearer the reeling end of the paper
making machine according to the length of time the bell is required to ring, and
which lever would break the circuit on the broken end of the web H passing it.
When the fresh web of paper is again passed over the machine this lever would
close the circuit and the alarm bell be free to act.
An alternative method of automatic cut off which would suit some paper
making machines better than the previous is as follows:-One of the leading or
guide rolls on the paper making machine is supported by springs in suitable
brackets (as usually in use on a paper making machine) suitable electric con-
nections being fitted to roll journal and bracket. The strain of the paper passing
over this roll compresses the springs thus closing the circuit. On the broken
web end reaching this roll the strain is removed and the springs expand to their
normal position thus breaking contact and stopping the bell. When the fresh
web of paper is again passed over the machine the renewed strain on the roll
would again close the circuit and the alarm be free to act.
Having now particularly described and ascertained the nature of my sai l
Invention, and in what manner the same is to be performed, I declare that what
1 claim is:
-
An alarm device for indicating the breaking of the web in naner making and

page_text: similar machines consisting of a lever arranged to rest upon the web and adapted
when the web breaks to close an electric signalling circuit substantially as
described.
Dated this 13th. day of November. 1897.
WALLACE FAIRWEATHER
of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62 Saint Vincent Street, Glasgow. Agent for the Applicant.