Roll or roller – Axially stacked annular members
Reexamination Certificate
2003-04-16
2004-05-04
Rosenbaum, I Cuda (Department: 3726)
Roll or roller
Axially stacked annular members
C492S045000
Reexamination Certificate
active
06730008
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a differential shaft for a strip-producing machine, comprising a differential shaft mainly made up of a shaft core, a securing plug disposed at one end of said shaft core, a multiples of rolling tubes and partition rings each alternatively positioned with the other and sleeve joined in a sequence onto the shaft core thereof, and a fixing plug clamping tight of said partition rings and rolling tubes thereof from the other end of the shaft core. Said partition rings are stably located onto said shaft core via a pair of position pins engaged with a pair of stepwise retaining recesses of the shaft core with a ring gap A formed there-between to reduce the friction thereof when the rolling tubes proceed with the strip production, effectively prolonging the lifespan thereof Moreover, pressed tight by said fixing plug, said partition rings can transversely move at the stepwise retaining recesses via pivot pieces of said position pins thereof, evenly distributing the clamping force onto each rolling tube for more smooth and efficient rolling movement thereof.
Please refer to
FIG. 1. A
conventional strip-producing machine
40
is mainly made up of a rolling shaft
41
onto which a whole piece of strip-material
411
is rolled up for further processing. When said strip-producing machine
40
is in operation, said strip-material
411
will be cut into a certain strips and rolled up respectively onto rolling tubes
421
of a differential shaft
42
. Differential effect is produced according to the tightness of the strip-material rolled up by said rolling tubes
421
thereof. There are some conventional differential shafts for strip-producing machine
40
.
Please refer to
FIGS. 2
,
3
. A conventional air-pressure differential shaft
10
is mainly made up of a shaft core
11
having an air bag
12
adapted at the center thereof, and a multiple of retaining recesses
111
equidistantly defining the outer periphery thereof each having a pushing block
13
and a metal ball
131
adapted therein with said pushing block
13
abutting against said air bag
12
at one end thereof A plurality of sliding differential seats
14
are sleeve joined to the outer periphery of said shaft core
10
thereof, each having a plurality of transverse elongated slots
141
distributed in a row thereon for a spring
142
and a supporting metal ball
143
to be adapted therein. Another sliding differential seat
14
′ are enlarged in width, each having transverse elongated slots
141
′ aligned in double rows thereon for two springs
142
′ and two supporting metal balls
143
′ to be adapted therein respectively as shown in FIG.
4
. Each of said sliding differential seats
14
,
14
′ is applied with a rolling tube
15
at the outer periphery thereon as shown in FIG.
5
. Said rolling rube
15
is pulled downward by gravity at one side, forming a contact area
16
with the upper periphery of said sliding differential seat
14
,
14
′ thereon as shown in FIG.
3
.
Please refer to FIG.
6
. In operation, air is let in from one end of said differential shaft
10
, inflating the air bag
12
of said shaft core
11
which then presses against said pushing blocks
13
thereof, extending said metal balls
131
outwards to contact with said sliding differential seats
14
,
14
′ thereof. Meanwhile, said sliding differential seats
14
,
14
′ and rolling tubes
15
are activated to rotate in different directions. Said springs
142
are expanded outwards with said supporting metal balls
143
abutting against said rolling tubes
15
in rolling manner for strip production.
There are some drawbacks to such conventional air-pressure differential shaft
10
. First, the rolling tubes
15
are sleeve joined to the sliding differential seats
14
with a contact area limited only for strips of more than 50 mm in width It's hard to produce slim strips of under 50 mm. Second, the assembly parts of said air-pressure differential shaft
10
are multiple and complicated, which not only increases costs of material and production but also time of assembly itself. Third, said rolling tubes
15
are activated via the pushing force of said springs
142
which are easily worn out of use, inconveniently increasing the time and cost of maintenance.
Please refer to FIG.
7
. Another conventional differential shaft
20
for a strip-producing machine is mainly made up of a shaft core
21
having a securing plug
22
sleeve joined at one end thereof, a locating groove
211
transversely defining the upper periphery thereof, a plurality of rolling tubes
23
and partition rings
24
alternatively sleeve joined in a sequence thereon, and a fixing plug
25
clamping tight of said rolling tubes
23
and said partition rings
24
from the other end thereof. Each of said partition rings
24
has a locating rib
241
projecting at the internal upper periphery thereof to be engaged with the locating groove
211
of said shaft core
21
for location thereof.
There are some drawbacks to such conventional differential shaft
20
for a strip-producing machine. First, said partition rings
24
are pulled naturally downwards by gravity which may increase the friction of the locating ribs
241
with both sides of the locating grooves
211
thereof Moreover, the internal upper side of said partition rings
24
has a larger contact area with said shaft core
21
. When said partition rings
24
along with said rolling tubes
23
are pressing tight via said fixing plug
25
from one end of said shaft core
21
, resistance of friction thereof may gradually cut down the pressing force thereof delivered to each rolling tube
23
as shown in FIG.
7
. Thus, in operation, said rolling tubes
23
can't move smoothly and evenly in rolling manner, affecting the differential effect of each rolling tube
23
in strip production. Second, under constant friction in a long time, said shaft core
21
, said rolling tubes
23
, and said partition rings
24
tend to be easily overheating and worn out of use quickly, greatly reduced in lifespan thereof. Third, said partition rings
24
unstably fixed onto said shaft core
21
only at one side via said locating ribs
241
engaging with said locating grooves
211
thereof may be inconveniently shaken when said shaft core
21
and said rolling tubes
23
are in rolling manner.
SUMMARY OF THE PRESENT INVENTION
It is, therefore, the primary purpose of the present invention to provide a differential shaft for a strip-producing machine wherein said differential shaft is suitable for the production of a wide range of strips, even for slim strips of under 5 mm in width. Said differential shaft has a plurality of partition rings stably located onto a shaft core via a pair of position engaged with a pair of stepwise retaining recesses of the shaft core with a ring gap A formed there-between. When pressed tight by a fixing plug from one end of said shaft core, said partition rings can transversely move at the stepwise retaining recesses via pivot pieces of said position pins thereof, evenly distributing the clamping force onto each rolling tube for more smooth and efficient rolling movement thereof in strip-production.
It is, therefore, the secondary purpose of the present invention to provide a differential shaft wherein the ring gap A thereof can prevent the direct contact of said partition rings with the shaft core thereof, reducing the friction and thus the overheating thereof when the rolling tubes proceed with the producing of strips, effectively prolonging the lifespan thereof.
It is, therefore, the third purpose of the present invention to provide a differential shaft for a strip-producing machine wherein said position pins disposed symmetrically at the internal upper and lower periphery of said partition rings can stably located said partition rings onto said shaft core without said partition rings thereof being unevenly shaken when said rolling tubes and said shaft core are moved in rolling manner.
REFERENCES:
pate
Cuda Rosenbaum I
Troxell Law Office PLLC
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