Improved Means for Giving Alarm in and Stopping Machines for Manipulating Paper and other Material.
Year: 1892

page_text: Date of Application, 4th Oct., 1892
Complete Specification Left, 1st May, 1893-Accepted, 5th Aug., 1893
PROVISIONAL SPECIFICATION.
Improved Means for Giving Alarm in and Stopping Machines for
Manipulating Paper and other Material.
I, PETER LUHN, of Johannisplatz 13, Leipzig, Germany, Manager of Printing
Works, do hereby declare the nature of this invention to be as follows:-
The improvements relate to machines for manipulating paper or other material
operating with carrying bands or cords, and have for their object the giving
automatically alarm or announcement of the breaking, splitting or slacking, such
bands or cords at the same time causing the stopping of the machine. The
improvements are performed by imparting to the bands or cords electric currents
operated through convenient contact makers the falling off or "breaking" of
which through the slacking, or breaking of a band or cord-causes the current to
be closed and suitable alarm sounded, also a convenient brake operated and the
machine thrown out of gear. The brake may conveniently be made to work on the
pulley shaft or a sleeve thereon which will allow of the shaft of the engine being
thrown out of gear. The brake being in electrical contact with a suitable armature
till the current is closed by one of the bands or cords operating one of their contact
makers.
Dated this 4th day of October 1892.
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improved Means for Giving Alarm in and Stopping Machines for
Manipulating Paper and other Material.
1, PETER LUHN of 13 Johannisplatz, Leipzig in the Empire of Germany,
Foreman, 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 devices for printing, ruling, folding and similar machines,
and has for its object to give notice, by means of the electric current, of the
breaking of the carrying bands or cords conveying the sheets of paper, or of the
endless paper web, if desired also simultaneously to cause the stoppage of the whole
machine.
The essential part of the invention consists in bringing the bands or cords of the
endless paper in communication with an electrical contact device, so that, if any
breakage of the former takes place, a closing of the circuit results, and thereby
suitable remedial devices are set in operation. This closing of the circuit may be
caused in many ways without thereby affecting the essence of the invention.
This invention is shown in different forms on the accompanying drawing-
Figures 1 to 3 show the device in combination with a machine in which the
separate sheets are conveyed by means of carrying bands or cords, and, on the
latter becoming slack or breaking, the contact is formed in consequence of
the weight of the device or part which operates the closing of the circuit.
Figure 4 shows a form of device in which any breaking or slackening of the
paper web effects the contact in the same manner.
In Figures 5 and 6, the contact is initiated by the actual weight of the band
which carries the sheets.
Figures 7 and 8 show a device in which the stretched band sets in rotation the
D

page_text: part which brings about the contact; on the rotation ceasing, the closing of the
circuit takes place by a hinged arm, which was previously under the influence of
centrifugal force, encountering a contact plate.
Figures 9 and 10 show an arrangement in which the taut band interrupts a
contact which is automatically closed on the band becoming slack or breaking. A
rotary machine is shown in Figures 1 and 2 in which the sheets are conveyed by
means of cords a. A contact device is arranged on each of these cords a consisting
of a sliding bar and roller c and a weight d. In order to obtain a reliable position
for the contact device, the lower end of the slide rod is passed through a slot in
the guide ledges e. The contact bars fand 9 are arranged on the latter and are
inserted in the circuit of a suitable source of current and insulated from each other.
The weight d thus serves preferably at the same time as a contact making organ,
as, when the cord is taut, it is held at a suitable height above the contact bars f
and g, whilst, when the cord becomes slack or breaks, the weight, on the contrary,
rests on the two contact bars f and g, and so closes the circuit.
In order to enable the degree of slackness to be regulated at which the closing
of the circuit shall take place, the weight d, which causes the contact, is adjustable
on the slide bar b.
In addition to the source of current r, an alarm y is also arranged in the current
circuit, which alarm, as may be easily seen, is caused to sound as soon as a cord a
becomes slack to a certain extent, Figure 3, or breaks. The person in charge is
thus warned to immediately stop the machine. If, simultaneously with the
sounding of the bell, an automatic stoppage of the machine is intended to take
place, an electromagnet is arranged in the circuit above mentioned, which, when
the circuit is closed, attracts its armature i, by this means a weight or spring, for
instance, is released which shifts the driving belt on to the loose pulley in the usual
manner.
The other ways of carrying out the invention are shown in Figures 4 to 9 and
differ from the one hereinbefore described merely in the method of forming the
contact. In general they all rest on the principle that, if the cord, or endless
paper, becomes slack or breaks, a closing of the circuit takes place, and thereby a
warning device or also an automatic stopping device is operated.
In Figure 4, a conducting bar lies crosswise the endless paper web 4, and then
the two contact strips m and n, which are insulated from one another and inserted
in the circuit, are arranged beneath the plane of the paper. As soon, therefore, as
the endless paper web breaks or becomes slack to a certain extent the bar forms
the electrical connection between the contact bars m and n so that the circuit in
question is closed.
In Figures 5 and 6, a stopping device A, consisting of the contact bars o and p
and the spring arm q, is arranged beneath the cord a. When the cord is taut, the
arm is held away from the contact bar o by means of the slight spring action,
whilst, on the cord becoming slack, it brings, by its own weight, the arm qin
connection with the contact bar o, and closes the circuit.
In Figures 7 and 8, the taut cord a sets a roller r in rotation, and a pendulum s
is jointed to the roller. As long as the cord is taut, and the roller r is kept
revolving, the pendulum s remains perpendicular to the axis of rotation, and out of
contact with a contact disc t arranged near the roller. r. As soon, however, as the
cord a become slack or breaks, the action of the centrifugal force ceases, and the
pendulums rests against the contact disc t in the manner shown in Figure 8. As,
however, the current is connected on the one hand with the contact disc and on the
other hand with the pendulum s, the circuit is closed by the contact of the pendulum.s.
with the contact disc t.
In the arrangement shown in Figures 9 and 10, a lever u forms the connection
between the contact bars v and w; the lever u is provided at its free end with a
sheath (holder) enclosing the cord a, and; when the cord is taut, is held at a little
distance away from the contact bar under a slight spring action. As 800n,
however, as the cord becomes slack or breaks, the lever u presses against the

page_text: contact bar v, so that the circuit connected with the contact bars and wis
closed.
Then, on the closing of the circuit in the arrangements shown in Figures 4 to 10,
an alarm, and in some cases also an automatic stopping device, or the like, is set in
operation in a similar manner to that employed for the arrangement shown in
Figures 1 to 3.
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 I
claim is :-
1. The improvements in devices for giving alarm and stopping machinery having
carrying bands or cords or endless webs, consisting in the bands, or cords or webs
being loaded with contact making devices which, when the band or cord or web is
taut, are out of communication with their respective contacts, and which, on its
becoming slack, or breaking, make electrical connection of two contact bars, thereby
closing the circuit attached to these latter, and thus setting in operation an alarm,
and in certain cases also an automatic stopping device.
2. The alternative form of the device specified in Claim 1, consisting of a contact
making device which drops by its own weight, on the cord or web becoming slack
or breaking, and thus establishes the connection between two contact bars, whilst a
weight which produces the electric connection between the two contact bars may
be adjusted according to the degree of slackness at which the closing of the circuit
shall take place.
3. The alternative form of the device specified in Claim 1, consisting of a
conducting bar which rests on the endless web, and, on the latter becoming slack,
or breaking, rests on the two contact bars situated a little below.
4. The alternative form of the device specified in Claim 1, consisting of a spring
arm which is pressed down by the weight of the cord or band or web on the latter
becoming slack or breaking, and thus effects the closing of the circuit.
5. The alternative form of the device specified in Claim 1, consisting of a spring
arm with a holder enclosing the cord or band or web by means of which the arm is
kept away from the contact disc belonging to it by the cord or band or web when
taut, but which, when the latter becomes slack or breaks, operates the closing of
the circuit.
6. The alternative form of the device specified in Claim 1, consisting of a roller
kept in rotation by the cord or band or web when taut, and having a pendulum
flexibly attached to it, which latter rests against a contact disc placed at the side
and thus closes the circuit whenever the centrifugal force caused by the rotation of
the roller ceases.
Dated this 29th day of Anvil 1902
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.