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Патент USA US3076260

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United States Patent ()?tice
1
3,076,250
Patented Feb. 5, 1963
2
3,076,250
TOW CRIMPING APPARATUS
Russel F. Baer, Decatur, Ala., assignor, by mesne assign
ments, to Monsanto Chemical ‘Company, a corporation
of Delaware
Filed Dec. 5, 1960, Ser. No. 73,895
6 Claims. (Cl. 28-1)
by the rotor 18 and the housing 12. Because of the ec~
centric positioning of the rotor 18 this volume varies
as the rotor 18 is turned. The feed rolls 16 are posi
tioned at the side of the housing where the rotor 18 and
the housing 12 are furthest apart, the voluume de?ned
by adjacent vanes ‘27, the housing and the rotor being
near maximum at this location.
The feed rolls 16 advance the tow 14 into the above
described volume at a rate of speed sut?cient to substan
more particularly to apparatus for crimping a tow of 10 tially ?ll this volume. As the tow is moved by the vanes
This invention relates to tow crimping apparatus and
thermoplastic ?laments.
In currently used tow crimpers, ?lament damage is
often caused by doctor blades and other parts which
become out of adjustment.
Also, wear on the various
27 toward the discharge opening 15, the volume de?ned
by the adjacent vanes, the rotor and the housing is de
creased to compress the tow. Since the tow is heated and
moistened (in a well known manner) prior to entry into
parts of the crimping device necessitates frequent ad 15 the housing, this compressing action serves to fully crimp
justment. With this in mind, one of the objects of this
the tow.
_
invention is to provide a tow crimping apparatus which
A clapper bar 30 pivotally mounted on the housing
is self-adjusting.
12 in the discharge opening 15 serves to restrict the dis
Another object of this invention is to provide a novel
charge of the crimped tow through the opening 15. The
and improved tow crimping apparatus.
20 piston of an air cylinder 31 is connected by a rod 32 to
A further object of this invention is to provide a tow
the clapper bar 30 for urging the clapper bar against the
crimping apparatus having a plurality of spring-loaded
vanes carried by a rotor and which engage and crimp the
tow.
tow to resist the passage thereof.
At the trailing side of the discharge opening 15 the
rotor 18 is very close to the housing 12. This causes the
Still another object of this invention is to provide a 25 above-described volume to be so small at this location
tow crimper wherein a tow-containing space is decreased
that the tow displaces the clapper bar 30 against the
in volume to crimp the tow.
One embodiment of this invention contemplates a tow
crimping apparatus having a cylindrical housing having
a ?rst opening for receiving a tow and a second open
ing for discharging the tow, a pair of feed rolls ad
vancing the tow into the housing. A rotor mounted in
the housing at a position eccentric or off center to the
housing carries a plurality of spring-loaded vanes which
engage the tow and carry it around the periphery of the
housing to the discharge opening. A clapper bar mounted
in the discharge opening serves to resist the passage of
the tow to further aid in the crimping operation.
action of the cylinder 31 and passes through the discharge
opening 15. The housing 12 at the trailing side of the
opening 15 is provided with a doctor blade 33 which in
sures that the crimped tow exits through the opening
15.
In operation of the apparatus, the motor 23 drives the
rotor 18 in a counterclockwise (FIG. 3) direction. The
tow 14, fed by the rolls 16, ?lls the spaces between the
moving vanes 27 at the opening 13and is carried around
the periphery of the housing 12. As the vanes 27 move
from the opening 13 toward the discharge opening 15,
the space between the housing and the rotor decreases to
Other objects and advantages of the invention will
crimp the tow held therein. By adjustment of the posi
become apparent when the following detailed description 40 tion of the shaft 20, the eccentricity of the motor 18 rel
is read in conjunction with the appended drawing, in
ative to the housing 12 may be adjusted to vary the
which:
FIGURE 1 is a plan view of an apparatus illustrating
amount of crimp applied to the tow 14.
It is to be understood that the embodiment disclosed
the principles of the invention and showing the general
herein may be modi?ed or altered and that numerous
arrangement of the apparatus;
45 other embodiments may be contemplated without de
FIGURE 2 is a front view of the disclosure of FIG
parting from the spirit and scope of the invention;
URE 1; and
What is claimed is:
FIGURE 3 is an enlarged sectional view taken along
1. An apparatus for crimping a tow, comprising a
line 3-3 of FIGURE 2 showing the construction of a
frame, a generally cylindrical housing mounted on the
rotor which moves the tow through the housing.
Referring now in detail to the drawing, a base 11 is
shown supporting a cylindrical housing 12 having a ?rst
opening 13 for receiving a heated and moistened tow 14
and a second opening 15 for discharging the tow. The
tow 14 is advanced through the opening 13 into the 55
housing by a pair of cooperating rolls 16 rotatably
mounted on a bracket 17 secured to the housing 12 and
which are driven in a well known manner. A rotor 18
frame and having a ?rst opening for receiving a tow, a
rotor mounted in the housing at a position eccentric to
said housing, a plurality of radially extending vanes slid
ably mounted on the rotor at spaced intervals, means
urging the vanes outward from the rotor, said housing
having a second opening for discharging the tow, a clap~
per bar movably mounted in the second opening for re
sisting the passage of the tow, and means for urging ‘the
clapper in a direction to close said second opening.
I
having a plurality of spaced radial slots 19 is carried
2. An apparatus for crimping a tow, comprising a
by a shaft 20 which is rotatably mounted in brackets 21 60 frame, a substantially cylindrical housing mounted on the
and 22. The brackets 21 and 22 are adjustably secured
frame and having a ?rst opening for receiving a tow to
to the housing 12 and to the base 11 so that the position
be crimped, a rotor mounted in the housing at a posi
of the rotor 18 may be varied relative to the housing 12.
tion eccentric to said housing and having therein a plu
A motor 23 turns the shaft 20 to drive the rotor 18.
rality of spaced radial slots, a plurality of vanes slidably
A plurality of vanes 27 slidably mounted in the slots 65 mounted in the slots, means for urging the vanes radially
19 are urged outward into engagement with the inner
outward into engagement with the housing, said housing
surface of the housing 12 by compression springs 28
having .a second opening for discharging the tow, a clap
mounted in the slots 19. The ends of the vanes 27 en
per bar pivotally mounted on the housing and positioned
gage the tow 14 at spaced intervals and hold the tow
in said second opening for resisting said discharge, means
against the inner surface of the housing 12 as the rotor 70 for urging the clapper bar in a direction to close said sec
18 is driven. It can be seen that adjacent vanes. de?ne
ond opening, and means for driving the rotor.
a volume, the cross-sectional width of which is limited
3. An apparatus for crimping a tow, comprising a
3,076,250
3
frame, a substantially cylindrical housing mounted on the
frame and having a ?rst opening on one side thereof for
receiving a tow, a rotor mounted in the housing eccentric
to said housing and having a plurality of spaced radial
slots, a plurality of vanes slidably mounted in said slots,
a plurality of springs mounted in the slots for urging the
vanes radially outward into engagement with the housing
for holding the tow against the housing, said housing hav
ing a second opening opposite said ?rst opening for dis
4
radially outward into engagement with the housing, said
housing having a second opening for discharging the tow
therefrom, said rotor being positioned in close promixity
to the housing at said second opening, and a clapper bar
mounted in the second opening for resisting the discharge
of the tow, said housing having a doctor blade at the
trailing side of the second opening for preventing fur
ther passage of the tow in the housing.
6. An apparatus for crimping a tow, comprising a
charging the tow, a clapper bar pivotally mounted on the 10 frame, a cylindrical housing mounted on the frame and
having therein a ?rst opening for receiving a tow, a pair
housing and in said second opening, and a ?uid cylinder
having a piston connected to the clapper bar for urging
said clapper bar against the tow.
of feed rolls mounted on the housing adjacent to the ?rst
opening for advancing the tow into the housing through
said opening, a rotor adjustably mounted in the housing
4. An apparatus for crimping a tow, comprising a
frame, a cylindrical housing mounted on the frame and 15 at a position eccentric to said housing and having therein
having a ?rst opening on one side thereof for receiving a
tow, a rotor mounted in the housing eccentric thereto and
a plurality of spaced radial slots, said rotor being adjust
ably mounted in the housing to vary the eccentricity of
having therein a plurality of spaced radial slots, a plu
rality of vanes slidably mounted in the slots in the rotor,
said rotor relative to said housing, a plurality of vanes
into engagement with the housing, said housing having a
second opening opposite the ?rst opening for discharging
housing having a second opening for discharging the tow
therefrom, said rotor being positioned in close proximity
slidably mounted in the slots, means for urging the vanes
means in the slots for urging the vanes radially outward 20 radially outward into engagement with the housing, said
to the housing at said second opening, and a clapper bar
‘the tow from said housing, and means positioned in the
mounted in the second opening for resisting the discharge
second opening for resisting said discharge of the tow.
5. An apparatus for crimping a tow, comprising a 25 of the tow, said housing having a doctor blade at the
trailing side of the second opening for preventing further
frame, a cylindrical housing mounted on the frame
passage of the tow in the housing.
and having therein a ?rst opening for receiving a tow, a
pair of feed rolls mounted on the housing adjacent to the
References Cited in the ?le of this patent
?rst opening for advancing the tow into the housing
through said opening, a rotor mounted in the housing at 30
UNITED STATES PATENTS
a position eccentric to said housing and having therein a
Lodge _______________ __ Feb. 10, 1948
2,435,891
plurality of spaced radial slots, a plurality of vanes slid
Scragg _______________ __ Mar. 6, 1962
3,023,481
ably mounted in the slots, means for urging the vanes
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