close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3088518

код для вставки
May 7, 1963
D. w. MoLlNs ETAL
3,088,510
KNIFE-EEEDING ARRANGEMENTS FoR sIcxLE-SHAPED
KNIVES 1N cuT-oFFs
Filed June 7, 1961
6 Sheets-Sheet 1
v/l
/
à
E
,om
@wm
&\\A
`N. ///
hm m. mm,
l."
MMM/@m
ATTORNEYS
May 7, 1963
D. w. MoLlNs ETAL
3,088,510
KNIFE-FEEDING ARRANGEMENTS FOR sIcxLE-SHAPED
KNIVES 1N cuT-oFFs
Filed June '7, 1961
6 Sheets-Sheet 2
A TToR/ve g
May 7, 1963A
D. w. MoLlNs ETAL
KNIFE-FEEDING ARRANGEMENTS FOR sIoxLE-SHAPED
KNIVES IN CUT-OFFS
Filed June '7, 1961
3,088,510
6 Sheets-Sheet 5
mm.
_ ‘l- - 1
Il
E.
QNBmwm»om
l__
am
on_
L
f
«41 7.
«_»
_,
__
mmE
@m__
MQ
QC
NN. l11./A
„
mm
,ê.
È
_Nm
,`
»NN
,
`
.wmf
MMAM/Il; VEN
x@
BMM A MMM
/l big; , ¿Aw „4MM
ATTORNEYS
May 7, 1963
D w. MoLlNs ETAL
KNIFE-FEEDINÓ ARRANGEMENTS FOR SICKLE-SHAPED
3,088,510
KNIVES IN CUT-OFFS
Filed June 7, 1961
_
E515.
6 Sheets-Sheet 4
67
MMM/77 `
BY QM ff MM
M, M, Jah/ßMa@
A TToRNz-L Y)
May 7, 1963
_
D. w` MoLlNs ETAL
KNIFE-FEEDING ARRANGEMENTS
Filed June 7, 1961
3,088,510
FOR SICKLE-SHAPED
KNIVES IN CUT-OFFS
6 Sheets-Sheet 5
m5@
ATTORNEYSr
May 7, 1963
D. W. MoLlNs
ET AL
3,088,510
KNIEE-FEEDING ARRANGEMENTS FOR
sIcxLE-SHAPED
KNI vEs IN CUT oFFs
Filed June 7, 1961
6 Sheets-Sheet 6
am?
MO
,Ä
«l 0.
3i
.ß
,
u
m
.
È
_ E9`
„ë.
N»5
,
/mmß6€7
States
ate i1; È
.
1
3 088,510
KNIFE-FERDING ARRANGEMENTS FÜR SICI/¿LE
SHAPED KNIVES IN CUT-@FFS
Desmond Walter Molins and .lames Arthur Mason, Dept
ford, London, Engiand, assiguors to Molins Machine
Company Limited, a British company
Filed .lune 7, 1961, Ser. No. 115,354
Claims priority, application Great Britain ll'une 8, 1960
5 Claims. (Cl. 1146-95)
34,088,510
Patented May 7, 1953
2
stop checks the rotary movement of the screw. The nut
may be returned to its original position by manual rota
tion of the screw as the said clutch -Will break at each
revolution of the screw.
Two constructions according to the invention are
shown in the accompanying drawings, one having an
independent «drive for the knife feeder and the other de
riving the knife feeder motion from the motion of the
cut~oif device itself.
In the drawings:
10
This invention concerns improvements in knife-feeding
FIGURE 1 is a sectional elevation of the iirst con
arrangements for knives in cut-offs of cigarette-making
struction;
machines, said knives being of the kind having a cut
FIGURE 2 is a top plan of part of FIGURE 1, partly
ting edge which is eccentric to the axis of revolution of
in section, and showing `further parts of the mechanism
the cut-off. Such knives are commonly termed “sickle 15 not visible in FIGURE l;
shaped knives” and this `term is used hereafter for brevity.
FIGURE 3 is an enlarged view of »the knife and its
As is well known these knives are lightly ground at
chain feeder means shown in FIGURE 1;
each revolution of the cut-off mechanism, that is, once
FIGURE 4 is an elevation of the second construction,
per cigarette cut, and consequently they wear out rather
partly in section;
quickly and it is necessary to provide means for feeding 20
FIGURE 5 is a plan of par-t of FIGURE 4 as viewed
the knife outwards from its carrier so as to compensate
on the section line 5_5;
for the wear.
FIGURE 6 is a view of a fragment of FIGURE 5 and
According to the invention there is provided a knife
is a section on the line 6_6;
feeding device for a cigarette machine cut-off having a
FIG-URE 7 is a view of a fragment of FIGURE 4 and
sickle-shaped knife, as deñned above, comprising a knife
is a section on the line 7_7;
clamp frictionally gripping the knife, an abutment engag
FIGURE 8 shows a modiñed knife-feeding arrange
ing the knife near its inner end and means for moving
ment;
the abutment to feed the knife outwards from the axis
FIGURE 9 is a fragmentary view of the right-hand
about which the cut-off rotates and against the friction
end of FIGURE 4 but illustrating a modified construc
of the clamp, said means comprising a flexible member 30 tion of a clutch;
attached to said abutment and means for moving said
FIGURE l0 is a view looking at the right-hand end
flexible member to move the abutment and the knife
of FIGURE 9 showing details of the clutch.
outwards from the said axis.
Referring to FIGURES 1 to 3 the cut-off -to which
The iiexible member may 'be attached to a nut and a
the invention is applied is of Ithe kind described and
screw threaded into the nut may be rotated to cause said 35 claimed in United States patent specification No. 1,860,
member to be moved to effect the knife-feeding move
197 and is only briefly described here.
ment. A chain is a suitable flexible member.
The iiexible member may be a chain attached to both
a gear wheel 12 to rotate at one revolution per cigarette
A shaft 10 is journalled in a box 11 and driven from
sides of the nut and guided around pulleys and the abut
to be cut. At 13 there is pivoted to the shaft 10 a knife
ment may be shaped to enter an aperture in the knife to 40 carrier 14 and this is in turn pivoted at 15 to a fork 16
provided driving engagement therewith.
which has a shaft 17 journalled and freely rotatable in a
Alternatively an end of the member may be attached
bearing block 18. This block is adjustable on a fixed
to a support engaging the inner end of the knife so that
bracket 19 having a curved face so that the angle be
if the nut is moved to exert tension on the member the
tween the axes of shafts 10 and 17 can be varied. This
knife will `be moved outwards against the friction of the 45 adjustment causes the traverse of a knife 20 attached to
clamp. In this case however the clamp should be adjusta
the carrier 14 to be altered.
ble to prevent centrifugal force, which is considerable
The linear speed of the cigarette rod in the cigarette
at the rate these cut-offs rotate, from throwing the knife
machine on which this cut-off is used is normally kept
outwards and causing it »to leave the support.
constant and different lengths of cigarette are obtained
Rotation 4of the screw may be effected by gearing 50 by altering the speed of rotating of the shaft 10; the
driven by the mechanism which drives the cut-off.
longer the cigarette the more >slowly the shaft revolves.
Alternatively the screw may be driven through a gear
Thus the knife to cut a long cigarette takes longer to pass
train of low velocity ratio said train comprising a gear
through the rod and the traverse of the knife must be
wheel fixed -to a shaft on which the cut-off revolves and
altered to suit. In other words during the timel the knife
rotatable therewith, a countershaft having two gear wheels
take to pass through the rod the rod has advanced by
iixed to it, one engaging the iirst said ‘gear wheel, a fur
ther gear wheel rotatably mounted on said shaft and
coupled to the said screw and engaging the other gear
wheel on the countershaft, said train having gear wheels
of such numbers of teeth that the product of driving and 60
driven teeth is substantially equal but not exactly equal.
The gear wheel coupled to the screw may be coupled
a certain amount and the knife traverse must, during cut
ting, equal this amount.
Other features of the normal cut-olf are a grinding disc
21 and a similar disc 22 for removing any burr caused
by grinding.
The knife 20 as best seen in FIGURE 3 is supported
by a block 23 and held frictionally between plates 24 and
thereto by being attached to a shaft passing through the
25. The block can be raised in a guide 26 by a chain
first said shaft and having a bevel gear wheel at one end,
27 which passes around pulleys 28 and is attached to an
the screw being provided with a bevel gear wheel engag 65 eyebolt 29 in the block 23. Thus, as the chain 27 is
ing the lfirst said Ibevel gear wheel. In this construction a
pulled, the knife will be moved outwards from the axis
Geneva stop -device may be provided to check the rota
tion of the screw when the nut has reached the end of
its movement along the screw and the attachment between
the gear wheel coupled to the screw and the shaft having
the second said bevel wheel at one end may be through
an overload clutch arranged 4to break when the Geneva
of shaft 17, sliding through the friction clamp formed by
plates 24 and 25. lIt will of course be understood that
the knife movement is extremely slow. The chain 27
draws the knifel supporting block 23 outwards from the
axis of the shaft 1‘7 against the pressure of a pair of
springs 52 (one only shown) surrounding rods 53 ar
3,088,510
ranged at each side of the chain 27. When the tension
on the chain is relaxed the block 23 will move inwards
again.
The chain 27 leads down towards the axis of the shaft
17 where it passes around another pulley 30 and is then
fastened to an eye in a short rod 31 which is supported
in a freely rotatable bearing 32 so. that the shaft 17 can
such that the knife moves outwards by about a millionth
of an inch per revolution of the cut-oiï.
In order to prevent damage to the nut 54 when it
reaches the inner end, FIGURE 4, of the screw 55, a
short shaft 68 is fixed to the screw 55 and has a small
gear wheel 69 at its lower end. This mates with another
gear wheel 70 and to each wheel there is fixed a disc
71 and 72 respectively, each provided with a sector-shaped
rotate around the rod 31 without causing any appreciable
protuberance 73 and 74 respectively, see FIGURE 7.
friction. Another chain 33 is fastened to a member 3.4
which is screwed to a housing `35 which constitutes the 10 These sectors operate like` a Geneva stop and at the be
bearing 32 and this housing is itself freely rotatable in
ginning when the nut 54 is in its outward position the
a further bearing 36. inside the shaft 17.
As shown,
sectors are clear of one another and as the wheels 69
the bearings consist of two rings of balls, this being the
and 70 rotate the sectors separate still further. At the
end of the run, that is, when the knife 20 has been fed
outwards to the limit of its movement, the sectors will
foul one another and the clutch 64-65 will.` break.
The restoration of the nut 54 to its inner position is
effected by applying a Spanner to a hexagon 75 formed
most suitable construction.
The chain 33 passes around a pulley 37 journalled in
the bearing block 18 and then outwards over another
pulley 38, see FIGURE 2, and the end is fastened to a
plate structure 39. This` structure is guided in grooves
40 in a forked bracket 41 by lugs 42 which slide in
the grooves 40 and in the middle of the housing is a
screw 43.
This is threaded into a nut 44 held captive
within the plate structure 39 but capable of rotation
therein at times. Normally the nut is held aganist rota
tion by a key 45 engaging a flat on the nut. The screw 43
is rotated by a -sprocket wheel 46 connected by a chain
47 in another sprocket wheel 48 mounted on a shaft 49
projecting from the box 11 and driven from the gear
wheel l12 by suitable gearing inside the box. Sprocket
on the outer end of the screw 55 and rotating the screw
to move the nut, the clutch pawl 63 clicking over the
collar 65 meanwhile.
Referring to FIGURE 8 the nut 54 and screw 55 are
as in FIGURE 4, but the flexible member, marked 150,
is attached to both ends of the nut and is guided around
four pulleys 151. Instead of support block 23 there is
provided an abutment 123 which is attached to the chain
and has a small lug entering a slot in the inner end of
the knife 20. In this way centrifugal yforce due to the
mass of the rotating knife cannot displace the knife where
wheel 46 is the input and screw 43 the output of a re
ductionV gear 109. When the knife has been fed outwards 30 as in the earlier constructions the knife could possibly`
be displaced by this force and disengage from the block
to the maximum amount and is replaced, the key 45 is
23, although the friction clampl is made adjustable to
removed and the nut 44 which has knurled shank is
avoid this.
turned by hand to bring it out towards the free end of
As in the specification referred to the knife carrier `14
the screw 43 and the cut-off is again ready for use.
Thus as the cut-off rotates, the knife 20 is slowly moved 35 could have a knife at each end in which case the knife
moving parts are duplicated and operated by another
outwards at a rate depending on the gearing between>
mitre wheel, like 56, placed at the opposite side. This
the gear wheel `12 and the screw 43, and the pitch of
would involve shifting the Geneva stop device to the outer
said screw. This rate could be readily altered if neces
end of the screw 55 and some local rearrangement of thc
sary by changing one of the sprocket wheels 46 and 48.
Referring now to FIGURES 4 to 7 the cut-off is of 40 parts. Further it will be apparent that any suitable type
of gear wheels, for example bevel gear wheels, may be
the same construction so the same references are used
substituted for the spur gear wheels 59, 60, 61, 62 in
for similar parts as the differences in detail construction
FIGURE 5.
are of no` essential importance and there is no need to
By` multiplying the numbers of driving and driven teeth
repeat the description of said parts. In this construction
a short chain 50 passing` around pulleys 51 draws the .~ in the »figures given it wil be seen that the wheel 62 rotates
48,400 times` while the wheel 59» (and the cut-olf shaft)
knife supporting block 23 outwards from the axis of shaft
rotates 48,399 times and that there is only a microscopic
17 against the pressure of the springs 52 as in the previ
difference in the rates of rotation of the two wheels. If
ous example.
a iiner or coarser rate of feed of the knife is required
An end of the chain 50 is attached to a nut 54 threaded
on to a screw 55 and at its inner end this screw has a 50 (for a given screw) it is only necessary to alter the teeth
numbers while keeping to the same differences between
mitre wheel 56 attached to it which mates with another
them. For example if a basic figure of aroundy 300 teeth
mitre wheel 57 fixed on a shaft 5S. This shaft is rotata
is adopted the teeth numbers would be 299-300-301-300
ble within the shaft 17. as will now be explained.
for 59, 60, 61 and 62 respectively and wheel 62 would
Four gear wheels 59, 60, 61 and 62 are arranged` as
rotate 90,000 times while the wheel 59 rotates 89,999
shown in FIGURE 5 and have 219, 220, 221 and 220
times.
teeth respectively. The gear wheel 62 has a pawl 63, best
With larger differences in teeth numbers the speed re
seen in FIGURE 6, pivoted to it at 64 and drawn into
duction would be less and while larger differences are
engagement with a clutch collar 65, which is keyed to the
possible, in view of the center-distance tolerance possible
shaft 58, by a spring 66. The gear wheel 59 is keyed
to the shaft 17 and thus rotates at the same speed, while 60 with involute teeth, differences of 1 tooth between each
pair will give almost any desired reduction and the center
the gear wheels 60 and 61 are attached to a countershaft
distances can remain correct and noise and wear` avoided.`
67 and revolve at equal speeds. The gear wheel 62 is
It is clear that the screw should have a reasonable pitch,
rotatable relatively `toA the shaft- 17, being journalled on
that is, not too small, as the nut will traverse it a great
the shaft 58 but rotating therewith as long as the pawl
many times in the course of a year and undue wear and
63 is in engagement with the clutch collar 65. The gear
tear are to be avoided.
ing described results in a very slight angular displace
Referring now to FIGURES 9 and 10 the clutch pre
ment per revolution between the wheels 59 and 62.
viously described with reference to the earlier figures is
The mitre wheel 57 is rotating on its axis at a speed
satisfactory in its operation but it has a slight drawback
only slightly diñerent from the speed of rotation of the
carrier 14 and thus the planetary motion of the mitre 70 in that as the cut-off continues to revolve after knife
feeding has ceased because of the Geneva stop a long
wheel 56.is almost the same as the axial rotation of the
time must elapse before the clutch pawl is in a position
mitre wheel 57, but, owing to the slight difference in the
to slip into the notch under the action of the spring. To
speed of the mitre wheel 57, the mitre wheel 56 receives a
avoid this the clutch may be constructed as shown in
tiny axial motion and so the screw 55 is rotated. The
FIGURE 10 where equivalent parts to those previously
combination of the gearing described and the screw is
3,088,510
5
6
illustrated have the references increased by 100. The
clutch pawl 163 pivoted at 164 has a sharp-pointed tooth
friction of the clamp, the said means comprising a flexi
163A at its free end. The clutch collar 165 is notched
a screw threaded into the nut with means driven from said
rotatable shaft for rotating the screw to cause said flexi
ble member to be moved to eifect the knife-feeding move
ment.
all around its periphery with notches corresponding in
shape to a sharp tooth 163B on the pawl. A locking
pawl 167 pivoted at 168 and having a longtajl 169 is pro
vided. When the clutch breaks the sharp tooth 163A
will engage with a notch in the neighbouring end of the
locking pawl and hold the clutch pawl out of engagement
with the collar. An abutment 17.1 is provided having a
stem 172 which is slidable in the gear housing and held
in the position shown by a light spring 17‘3. The outer
edge of the locking pawl is eccentric after the clutch has
ble member attached to said abutment and to a nut, and
2. A knife-feeding device as claimed in ‘claim 1 where
in the dlexible member is a chain attached to both sides
of the nut and guided around pulleys and the abutment
is shaped to enter an aperture in the knife to provide driv
ing engagement therewith.
3. A knife-feeding device as claimed in claim 1 in
which the screw is driven through a gear train of low
velocity ratio, said train comprising a gear Nvheel -ñxed
broken. After a new knife has been fitted and the cut-off
is set into motion again the stem `172 can be pressed 15 to the shaft on which the cut-off revolves and rotatable
therewith, a countershaft having two gear Wheels ñxed
down by a knob 174 and the tail of the locking pawl will
to it, one engaging the first said gear wheel, a further
strike the abutment and the pawl will be turned on its
gear wheel rotatably mounted on said shaft and coupled
pivot to release the clutch pawl so that its tooth can enter
to the said screw and engaging the other gear wheel on
a neighbouring notch in the clutch collar. As above
remarked the clutch collar in this example is notched 20 the counter shaft, said train having gear wheels of such
all around. This means that the clutch pawl can move
numbers of teeth that the product of driving and driven
into engagement with a notch in the collar after a fairly
teeth is substantially equal but not exactly equal.
short time when the cut-off starts to revolve. With the
earlier arrangement the distance between the notches
4. A knife-feeding device as claimed in claim 3 in
ywhich the gear wheel coupled to the screw is coupled
made clutch re-engagement a very slow process as the 25 thereto by being attached to a shaft passing through the
difference in speed between the shaft 17 and gear wheel
iirst said shaft and having a bevel gear wheel at one end,
62 is exceedingly small and naturally when the clutch
the screw being provided with a bevel gear wheel engag
is disengaged the shaft 58 will revolve at the same rate
ing the first said bevel gear wheel.
as the shaft ‘17. As the cut-off shaft is rotating a frac
5. A knife-feeding device as claimed in claim 4 com
tion faster than the wheel 62 the sharp tooth 163B is able 30 prising a Geneva stop device to lcheck the rotation of the
to slide down the trailing ñank of a notch easily and
screw when the nut has reached the end of its movement
without shock.
along the screw and in which the attachment between the
In these views the gear wheels shown have the same
gear wheel coupled to the screw and the shaft having the
general function as before but as it was found with the
second said bevel at one end is through an overload clutch
gears illustrated in FIGURES 4 and 5 that the feed rate
arranged to break when the Geneva stop checks the
of the knife was somewhat coarse, many more teeth
rotary movement of the screw.
were cut on the gears, those shown in FIGURE 10 being
100 DP. so that much larger tooth numbers could be
used.
What we claim as our invention and desire to secure by 40
References Cited in the ñle of this patent
UNITED STATES PATENTS
Letters Patent is:
1. A knife-feeding device for a cigarette machine cut-
1,914,756
1,991,795
Rosler ______________ __ June 20, 1933
'Debaecker ___________ __ Peb. 19, 1935
off mounted on a rotatable shaft and having a knife, com
1,992,735
Bronander ___________ __ Feb. 26, 1935
463,577
878,916
Great Britain __________ __ Apr. 2, 1937
Germany ____________ __ June 8, 1953
prising a knife clamp frictionally gripping the knife, an
abutment engaging the knife near its inner end, and means 45
for moving the abutment to feed the knife outwards from
the axis about which the cut-olf rotates and against the
FOREIGN PATENTS
Документ
Категория
Без категории
Просмотров
0
Размер файла
691 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа