Improvements in Safety Feed Gear for Chaff Cutters and like Machines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Safety Feed Gear for Chaff Cutters and like
Machines.
I, JAMES MARSHALL, of Britannia Iron Works, Gainsborough in the County of
Lincoln, Engineer, do hereby declare the nature of this invention to be as
follows:-
Chaff cutters are usually fitted with throwing out gear consisting of a clutch
and bevel wheels, actuated by a hand or foot lever, but when a person is caught
by the machine he is apt to lose presence of mind and forgets to operate the
throwing out gear.
There are also arrangements in use whereby on a person being caught in the
feed rollers and drawn into the machine the throwing out gear is automatically
brought into action. The object of my invention is to provide an arrangement
whereby the throwing out gear operates before a person is caught by the feed
rollers and takes effect before the hand of a person feeding the machine can
reach the feed rollers.
According to my invention I arrange in the mouth of the feed box at the back
of the toothed feeding rollers, plain rollers which are free to rotate and press
down the material to be cut and guide it to the feed rollers. The last of these
plain rollers I place at distance from the feed rollers greater than the length
of a man's arm and I so mount this roller on the levers which actuate the throwing
out gear that, in case the person feeding allows his hand to pass under this roller,
the pressure of his arm against the said roller causes the throwing out lever to
be moved and the feed stopped or stopped and reversed.
1011
of Vov 1808
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Apents.
COMPLETE SPECIFICATION.
Improvements in Safety Feed Gear for Chaff Cutters and like
Machines.
I, JAMES MARSHALL, of Britannia Iron Works, Gainsborough in the County of
Lincoln, 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:―
Chaff cutters are usually fitted with throwing out gear, consisting of a clutch
and bevel wheels, actuated by a hand or foot lever, but when a person is caught

page_text: by the machine he is apt to lose presence of mind and forget to operate the
throwing out gear.
There are also arrangements in use whereby, on a person being caught in the
feed rollers and drawn into the machine, the throwing out gear is automatically
brought into action. The object of my invention is to provide an arrangement
whereby the throwing out gear operates before a person is caught by the feed
rollers and takes effect before the hand of a person feeding the machine can
reach the feed rollers.
According to my invention I arrange in the mouth of the feed box at the back
of the toothed feeding rollers, plain rollers which are free to rotate and press
down the material to be cut, and guide it to the feed rollers. The last of these
plain rollers I place at a distance from the feed rollers greater than the length
of a man's arm and I so mount this roller on the levers which actuate the throwing
out gear that, in case the person feeding, allows his hand to pass under this roller,
the pressure of his arm against the said roller causes the throwing out lever to
be moved and the feed stopped or stopped and reversed.
In the accompanying drawing Figure 1 represents in side elevation and
Figure 2 in end view, the feed-mouth portion of a chaff-cutting machine provided
with a safety feed gear arranged in accordance with my invention wherein three
plain rollers are used but I do not limit myself to this number nor to the precise
arrangement shewn for connecting the movable roller with the throwing out or
reversing gear.
The toothed rollers A and B force the material being cut, out of
the mouth of the machine to the cutting knives, the upper of these rollers being
usually arranged to rise and fall to suit the amount of material passing between
the said toothed rollers. At the back of these toothed rollers are plain rollers C
and D, also free to rise and fall and carried in a cap or hood E which can turn
on the centre e. I do not claim under this application the use of rollers such
as CD or the hood in which they are carried as machines fitted with these have
been made and sold by my firm for some years past but according to my present
invention I connect the last roller F with the lever G which actuates the throwing
out or reversing gear. This is shewn as being effected by carrying the roller F
in a frame bolted at one side to the lever G and at the other side turning on a
centre pin fin line with the centre on which the lever G turns. The said roller F
I place at a distance from the toothed rollers A and B greater than the length of
a man's arm so that before the attendant's hand can be caught between the toothed
rollers, his shoulder, or the upper part of his body, is brought in
contact with the roller F causing this roller and the lever G to which
it is connected, to be moved from the position shewn in full lines to that
shewn in dot and pick lines, and by this means the clutch which drives the feed
gear of the machine is released and the feed stopped, or stopped and reversed.
The throwing-out gear may consist of the usual arrangement of bevel wheels and
clutch which is commonly used in machines of this description and is not shewn
on the drawing. To cover the space between the rollers D and F I attach the
small hood to the frame f this hood entering the hood E when the roller F
is pressed forward.
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:
1. In safety feed gear for chaff cutters and like machines wherein plain pressing
and guiding rollers are used at the rear of the toothed feeding rollers the con-
nection of the rearmost of these rollers to the throwing out or reversing gear
the said roller being placed in such a position and at such a distance from the
toothed feed rollers that the attendant's shoulder or body will operate the throwing
out or reversing gear by contact with the said safety roller, and thus stop or
reverse the feed of the machine, before, his hand can be caught by the toothed
feed rollers.

page_text: 2. The safety feed gear consisting of the arrangement and combination of parts
substantially as herein before described and illustrated in the accompanying
drawing.
Dated this 22nd day of August 1898
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.