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Патент USA US2134391

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Oct. 25, 193,8.
D. J. ANGUS
2,134,391
REROLL DRIVE MECHANISM FOR GRAPHIC METERS
Filed April 6, 1937
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BY
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ATTORNEYS.
2,134,391"
Patented Oct. 25, 1938
UNITED STATES PATENT oFEicE
2,134,391
REROLL DRIVE MECHANISM FOR GRAPHIC
METERS
Donald J. Angus, Indianapolis, Ind.
Application April 6, 1937, Serial No. 135,264
2 Claims. (C1. 18S-_37)
spring-winding Adirection (as in unrolling the
with the gear 2li and driving a gear 22, and a
pinion 23 fast on the shaft I8 which drives the
re-roll roller I2.
Between the pinion 2| and the gear 22, how
record sheet for inspection) without danger of
over-,winding the spring and without being lim
ited by full winding of the spring, but also without
undue shock stops the spring-unwinding move
2| is> fast on a shaft 25. Also fast on that shaft
25 is a disk 2S. The gear 22 is loose on the shaft
It is the object of my invention to provide for
graphic meters a re-roll drive mechanism which
not only permits rotation of the re-roll roller in
3
ment of the re-roll roller if such movement is too
rapid, as on breakage of the paper or failure
of the supply of paper.
With that end in view, I provide in the driving
mechanism for the re-roll roller a slipping clutch
which slips upon undue spring-winding move
" ment of the re-roll roller; and also provide a
light-weight member frictionally connected with
the re-roll roller so that it may slip under stress,
and provide on that light-weight member a cen
ever, the driving connection is not positive, but
frictional and slippable. To that end, the pinion
25; but it lies in frictional engagement with the
disk 26, into which frictional engagement it is
forced by a coiled compression spring 2l lying be
tween the gear 22 and a flange 28 of the pinion 2 I.
By reason of the frictional engagement between
the disk 26 and the gear 22, relative rotation is
permitted between the pinion 2| and the gear 22, 15
as may be required; but the friction is suñiciently
great so that it is normally adequate for driving
the re-roll roller |2.
20 a stop-pin to stop the light-weight member and
Loose on the shaft I8 of the re-roll roller is a
spool 30, which has a frictional engagement on
thereby gently stop the re-roll roller Without
undue shock upon too rapid spring-unwinding
A coiled compression spring 32 on the other side
trifugally operated part which cooperates with
one side with a disk 3| fixed to said shaft I8.
of said spool 30, and lying between said spool and
.
the pinion 23, maintains the frictional engage
The accompanying drawing illustrates my in
vention: Fig. 1 is a vertical section, substantially ment between the spool 30 and the disk 3|. The
on the line I-I of Fig. 2, through a driving spool 3U is light in weight, so that when its
mechanism embodying my invention; Fig. 2 isv movement is stopped by the stop shoulder 34
a fragmentary side elevation of the mechanism its stoppage requires little force.
Within the groove of the spool 3l) is pivoted a
shown in Fig. l, with some parts broken away;
stop-member 33, provided with a stop-shoulder 34
and
Figs.
3
and
4
are
enlarged
transverse
sec
30
for cooperating with a pin 35 flxedly mounted in
tions, on the line 3-4 of Fig. 1, through the light
the frame-work of the meter. The stop-member
weight, centrifugally operated, frictionally mount
ed, stopping mechanism, with the centrifugally 33, as shown, is of a general U-shape (Figs. 3 and
operated members in its inner and outer positions 4), with its supporting pivot 33a at the base of
movement of the re-roll roller.
35
respectively.
The graphic meter may be of any desired type,
in which a record sheet III or traveling chart is
driven at predetermined speed by and over a
feed-roll II, from which it passes to a re-roll
40 roller l2 on which it is rewound. The feed-roll
l I may be driven in any suitable manner, not
involved in the present invention; and a graph
is made on the record in any suitable manner,
well understood.
the U and with one arm somewhat heavier than 35
the other so that that heavier arm will move out
ward by centrifugal force if the rotation of the
spool 30 is too rapid. That heavier arm, which is
thus thrown outward by centrifugal force, is the
40
one which carries the stop-shoulder 34.
In order to avoid the necessity for any spring
for normally holding the stop member 33 re
tracted within the groove of the spool 30, the pin
35 is preferably located so that it will not be
engaged by the stop-shoulder 34 if in the course
of slow rotation of the spool 30 the heavier arm
of the stop-member 33 drops out of the spool
groove by gravity. To that end, the stop-pin 35
is desirably located, as illustrated in Figs. 3 and 4, 50
slightly above the horizontal plane of the shaft
|8 on that side of the spool 3|) which travels
The re-roll roller I2 is driven by a suitable
coil spring I5, shown as windable by a key on a
stem I6, which is held against backward move
ment by a ratchet mechanism I6'. For such
driving, one end of the spring I5 is suitably con
50 nected to a gear I'I; which is connected through a
train of gears to a shaft I8 carrying and driv
ingly connected to one end of the re-roll roller I2
in any suitable manner. As shown, that driving - downward in the normal spring-driven movement
train includes a pinion I9 meshing with the gear of the re-roll roller I2.
In operation:
55 I'I and ñxed to a gear 20, a pinion 2| meshing
45
2
2,134,391
The spring I5 is Wound in the usual manner,
by a key on the stem I6.
The spring I5 drives the re-roll roller I2
through the intervening gearing; which driving
occurs with no normal slipping between the gear
22 and the disk 26.
If with the spring I5 wound or nearly wound
the operator winds the re-rcll roller I2 backward,
as by unrolling the re-rolled record chart to see
what its showing was at some earlier time or over
some earlier period, and thus moves the gear I'I
backward to cause winding of the spring I5, no
breakage occurs when and if the spring I5 reaches
fully wound condition, because such slipping then
due shock.
I claim as my invention:
1. In a graphic meter, the combination of a 5
re-roll roller, a driving spring therefor, a driving
connection interconnecting said driving spring
and said re~roll roller, a light-weight rotatable
member frictionally interconnected with said re
roll roller and provided with a centrifugally 10
actuated part having a stop-shoulder, and a stop
pin in a position to be engaged by said stop
shoulder on centrifugal actuation of said cen
trifugally actuated part to stop said light-weight
occurs between the gear 22 and the disk 26 as may
be necessary to accommodate the excess move
member and thereby after some slipping at the 15
ment of the re-roll roller I2 after the Spring I5
member and the re-roll roller to cause a gentle
is fully wound.
v
away in the event it somehow gets free, but the
mechanism is nevertheless guarded against un
frictional connection between said light-weight
stopping of the latter.
If for any reason the re-roll roller I2 starts to
2. In a graphic meter, the combination of a
rotate forward too rapidly, or in the spring-un
re-rcll roller, a driving spring therefor, a driving 20
winding direction, as because the record sheet connection interconnecting said driving spring
breaks or the supply of record sheet is exhausted and said re-roll roller, a light-weight rotatable
or the operator suddenly releases the unrolled member frictionally interconnected with said re
record sheet, the excessive speed of rotation roll roller and provided with a centrifugally ac
causes the heavier arm of the U-shaped stop
tuated part having a stop-shoulder, a stop-pin in
member to ily outward so that the stop-shoulder a position to be engaged by said stop-shoulder on
34 will strike the pin 35. This stops the spool 3U centrifugal actuation of said centrifugally actu
abruptly. But the hammer-blow between the ated part to stop said light-weight member and
stop-shoulder 34 and the pin 35 is relatively thereby after some slipping at the írîctional con
light, because the frictional mounting of the spool nection between said light-weight member and 30
30 on the shaft I8 permits such shaft I8 and the the re-roll roller to cause a gentle stopping of the
re-roll roller and the parts geared thereto to be latter, said driving connection between the re
brought to a relatively gentle stop by reason of roll roller and the spring including a frictional
the slipping, usually for only a part of a revolu
drive which permits slipping on reverse winding
tion, between the spool 30 and the disk 3I. Thus of the re-roll roller with the spring wound.
35
the re-roll roller I2 is prevented from running
DONALD J. ANGUS.
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