SUMMARY OF THE INVENTION
[0001] The present invention relates to a combing roller utilized for an open-end spinning
machine and, more particularly, relates to an improved combing roller wherein the
roller is provided with a metallic wire mounted on the peripheral surface thereof
without a free space where fibers can not receive effective combing action.
BACKGROUND OF THE INVENTION
[0002] In a known embodiment of the open-end spinning machine, a bundle of fibers supplied
from an upstream supplying mechanism is opened by means of a combing roller, so as
to separate the bundle into individual fibers, and the separated fibers are carried
into a twisting mechanism so as to form a twisted yarn. In such an open-end machine,
a combing roller provided with a metallic wire helically secured on the peripheral
surface of the main body of the combing roller is utilized.
[0003] It is well known that the above mentioned metallic wire is provided with a cross-section
comprising a laterally expanded base portion and a teeth portion projected upward
from the base portion. When the metallic wire is mounted on the peripheral surface
of the main body of the combing roller, the base portion of the metallic wire is pressed
into a helical groove formed on the peripheral portion of the main body of the combing
roller by means of a press roller, so that the metallic wire can be rigidly mounted
on the main body of the combing roller. To attain an effective action of the combing
roller, the helical groove is formed on the peripheral portion of the main body with
a pertinent pitch along the axial direction of the combing roller. It is well known
that the main body is coaxially provided with a flange at each end thereof. Therefore,
in such a combing roller, cylindrical spaces are formed on the peripheral portion
of the main body between the two flanges and the corresponding spiral portions of
the metallic wire, which are the starting and terminal portions of the metallic wire.
The axial size of those cylindrical spaces has been allowed to be almost the same
as the above-mentioned pitch of the helical groove, that is the axial pitch of the
metallic wire. It is the understanding of the inventors of the present invention that
the reasons for the above-mentioned axial size of those cylindrial space are as follows.
First since the mounting of the metallic wire on the main body of the combing roller
is carried out by pressing the shoulder of the base portion of the metallic wire into
the helical groove of the main body by means of a pressing disc having a certain thickness,
it is necessary to have a space for carrying out the pressing operation when the pressing
operation is carried out on the portions of the wire closest to the above--mentioned
flanges, and; second, it is not recognized that the cylindrical spaces at the two
end portions of the main body of the combing roller give rise to a serious problem.
[0004] According to the technical principle of the open-end spinning method, it is essential
to feed well separated individual fibers into a yarn forming mechanism, such as a
spinning rotor, and the function of the combing roller is to do this. Therefore, generally
speaking, the body of the combing roller and the metallic wire are made with precision,
and the mounting of the metallic wire on the main body of the combing roller is carried
out with precision precisely, so as to ensure the function of the combing roller.
However, it is the experience of the inventors of the present invention that, even
if the combing roller is made with precision as mentioned above, it is quite difficult
to eliminate possible creation of slubby portions in the twisted yarn, and it is their
understanding that one reason for the creation of such slubby portions is due to the
defective functioning of the conventional combing roller which results from the above
mentioned cylindrical spaces,
[0005] Therefore, the principal object of the present invention is to provide an improved
combing roller which does not give rise to the above mentioned defective function
of the conventional combing roller.
[0006] To attain the purpose of the present invention, an analysis of the action of the
conventional combing roller was carefully carried out, and it was found that the above-mentioned
cylindrical spaces formed at both of the -axial end portions of the main body of the
combing roller are free from the combing action even though a part of a supplied bundle
of individual fibers is introduced therein. Consequently, it is possible for blocks
of entangled fibers to be fed into the yarn forming mechanism, such as the spinning
rotor. The above-mentioned cylindrical spaces are hereinafter referred to as free
spaces.
[0007] Based on the above-mentioned result, the inventors of the present invention have
devised the following described combing roller to attain the purpose of the present
invention. That is in the combing roller utilized for an open-end spinning machine,
wherein a metallic wire is mounter on a body of the combing roller, the body of the
combing roller comprises a main cylindrical body and a pair of flanges coaxially formed
at both ends of the main body, a base portion of the metallic wire is pressed into
a right hand or left hand helical groove and the working direction of the metallic
wire coincides with the rotational direction of the combing roller a free space formed
on the main body at a first position between one of the above--mentined flanges located
on a side of the combing roller corresponding to the direction of progress of an imaginary
right hand screw imaginarily engaged with the right hand helical groove or an imaginary
left hand screw imaginarily engaged with the left hand groove when the imaginary screw
is turned in the counterclockwise direction and a tooth point of the end portion of
the metallic wire is represented as a first free space, while a free space formed
on the main body at a second position between the other flange and a tooth point of
the other end portion of the metallic wire is represented as a second free space,
the axial size of the first free space is smaller than that of the second free space.
To practically satisfy the above-mentioned condition, the following two types of combing
roller are embodied.
[0008]
(1) In a first type of the combing roller according to the present invention, the
metallic wire is mounted on the main body of the combing roller in such condition
that a laterally expanded base portion of the metallic wire faces the flange of the
combing roller located at a side of the second free space of the combing roller.
(2) In a second type of the combing roller according to the present invention, the
metallic wire is mounted on the main body of the combing roller in such condition
that a terminal portion of the metallic wire adjacent to the above-mentioned first
free space is provided with at least one tooth inclined toward the flange formed at
the position adjacent to the first free space of the combing roller.
BRIEF EXPLANATION OF THE DRAWINGS
[0009]
Fig. 1 is a schematic side view, partly in section, of the known open-end spinning
unit;
Fig. 2 is a schematic front view of a combing roller utilized for the open-end spinning
unit illustrated in Fig. 1, wherein the combing roller is provided with a metallic
wire rigidly inserted into a right hand helical groove of formed on the main body
thereof;
Fig. 3 is a schematic front view of a combing roller utilized for the open-end spinning
unit illustrated in Fig. 1, wherein the combing roller is provided with a metallic
wire rigidly inserted into a right hand helical groove formed on the main body thereof;
Fig. 4 is a schematic sectional view of an end portion of the combing roller illustrated
in Fig. 2, wherein a metallic wire is mounted in the known condition;
Fig. 5 is a schematic sectional view of an end portion of the combing roller illustrated
in Fig. 3, wherein a-metallic wire is mounted in the known condition;
Fig. 6 is a schematic sectional view of an end portion of the combing roller illustrated
in Fig. 2, wherein a metallic wire is mounted in the particular condition according
to the present invention;
Fig. 7 is a schematic sectional view of an end portion of the combing roller illustrated
in Fig. 3, wherein a metallic wire is mounted in the particular condition according
to the present invention.
Fig. 8 is a schematic front view, partly in section of an embodiment of the combing
roller according to the present invention,
Fig. 9 is a schematic front view, partly in section of a part of another embodiment
of the combing roller according to the present invention,
Figs. 10 and 11 are cross-sectional view of a part of the combing roller according
to the present invention respectively.
DETAILED EXPLANATION OF THE PRESENT INVENTION
[0010] Before explaining the preferred embodiments of the present invention, for the sake
of a clearer understanding the present invention, the structure of the conventional
combing roller and the defect thereof will first be explained in detail, with reference
to the attached drawings of Figs. 1, 2, 3, 4 and 5. It is possible to manufacture
the following four types of combing rollers.
[0011] (1) In the case of mounting a metallic wire 8 on a main body 5a provided with a right
hand helical groove 9 in such condition that the working surface of each tooth faces
toward the counter-clockwise rotational direction of the combing roller 5:
(a) the shoulder side of the metallic wire 8 faces the direction of progress of an
imaginary right hand screw in the helical groove 9 in an imaginary screw engagement
when the imaginary right hand screw is turned in the counter clockwise direction;
(b) the shoulder side of the metallic wiere 8 faces the direction opposite to the
direction of progress of the imaginary right hand screw mentioned in l(a), above.
[0012] (2) In the case of mounting a metallic wire 8 on the main body 5a provided with a
left hand helical groove 9 of in such condition that the working surface of each tooth
faces toward the counter-clockwise rotational direction of the combing roller 5:
(a) the shoulder side of the metallic wire 8 faces the direction of progress of an
imaginary left hand screw in the helical groove 9 in an imaginary screw engagement
when the imaginary left hand screw is turned to the clockwise direction;
(b) the shoulder side of the metallic wire 8 faces the direction opposite to the direction
of progress of the imaginary left hand screw mentioned in 2(a), above.
[0013] It is well known that when the metallic wire 8 is pressed into the helical groove
9, the base portion 8a of the metallic wire 8 is continuously pressed into the helical
groove 9 toward the working direction W (in Fig. 1) of the metallic wire 8. However,
to prevent any possible damage to the working face and point of each tooth of the
metallic wire 8, and also, to prevent any possible damage to of the helical groove
9, in the mounting operation of the metallic wire on the main body 5a of the combing
roller, only the two conditions (l)-(a) and (2)-(b) mentioned above can be practically
applied. That is, the combing rollers 5 having the construction illustrated in Figs.
2 and 4, and Figs. 3 and 5 are utilized at present.
[0014] In the case of utilizing the combing roller 5 illustrated in Figs. 2 and 4, when
a sliver S is fed to the combing roller 5, since the combing roller 5, provided with
a metallic wire 8 mounted thereon in a right hand helical groove, is rotated counter-clockwise,
there is a tendency of displacing the fibers toward the direction of progress of a
imaginary right hand screw turned counter-clockwise when in imaginary engagement with
the helical groove 9. Such displacement tendency of the bundle of fibers S is represented
by a two dot broken line in Fig. 2. It is understood that, according to the above--mentioned
displacement, a plurality of fibers are introduced into the free space, that is the
first free space, between a flange 5b located at the above-mentioned direction of
progress of the right hand screw turned clockwise in imaginary engagement with the
helical groove 9 and the adjacent terminal of the metallic wire 8. On the other hand,
there is a tendency not to supply fibers into the second free space between the other
flange and the end of the metallic wire 8 adjacent thereto. It must be recognized
that the fibers introduced into the working zone of the combing roller 5 receive desirable
opening action by imparting the combing action of the teeth of the metallic wiere
8. However, in the above-mentioned first free space, since there are no teeth of the
metallic wire on the peripheral surface of the main body 5, it is impossible to apply
any combing action of the teeth of the metallic wire 8 to the fibers introduced therein
and, consequently, such non-opened fibers are introduced into the yarn forming mechanism
so that slubby portions are created in the yarn. Accordingly, it is the concept of
the present inventors that, if the above-mentioned first free space is restricted
so that it is as small as possible, the problem due to the possible creation of slubby
portions of yarn and possible breakage of yarn during the spinning operation can be
eliminated. On the other hand, the axial size of the above-mentioned second free space
is not serious, because of the tendency of fibers not to be introduced into this second
free space and, therefore, it is essential to satisfy the condition that the second
free space can be lager than the first free space.
[0015] In Fig. 4, indicating the conventional combing roller 5, the helical angle of the
right hand groove is represented by 6. The conventional process of mounting the metallic
wire 8 on the main body 5a of the combing roller 5 by utilizing a pressing disc 10
is hereinafter explained, with reference to Figs. 2 and 4. That is, a starting end
of the metallic wire 8 having a cross section as shown in Fig. 4 is firstly pressed
into a starting point P
11 The base portion 8a of the metallic wire 8 is continuously pressed into the helical
groove 9 by pressing the shoulder 8b of the metallic wire 8, by means of a pressing
disc 10 which is in rotatable contact with the shoulder 8b, toward the working direction
W (Fig. 1) of the metallic wire and into the helical groove 9. In the above-mentioned
operation, the pressing roller 10 is displaced toward a direction a
1, which is parallel to the axial. direction of the body of the combing roller 5, since
the pressing roller 10 is displacably mounted on a shaft (not shown) which is parallel
to the axial direction of the body of the combing roller 5. As is well known, the
metallic wire 8 is continuously supplied from a supply roll of the metallic wire (not
shown). In such a mounting operation, since the pressing disc 10 is always located
at a position separated from any portion of the helical groove 9 into which the metallic
wire..8 has not been pressed, there is no possiblity of damaging the helical groove
9 before the base portion 8b of the metallic wire is pressed into the groove 9. It
must be further recognized that since the helical groove 9 is formed in the condition
of right hand thread, when the base portion 8b of the metallic wire 8 is pressed into
the helical groove 9, the teeth portion 8c of the metallic wire 8 has a tendency to
slightly incline toward the axial direction opposite to the flange 5b, and there is
no possiblity of damaging the teeth portion 8c of the metallic wire 8 by its coming
into contact with the pressing disc 10. It should be noted that it is possible to
carry out the above mentioned mounting operation without damaging the groove 9 or
teeth portion 8c because a wire 8 having the cross section illustrated in Fig. 4 is
utilized in the conventional combing roller 5 illustrated in Figs. 2 and 4.
[0016] Referring to Figs. 2 and 4, the distance from the starting end of the helical groove
9, containing the metallic wire 8, to the flange 5b is represented by x, while the
width of the shoulder 8b, which is almost equal to the distance from the tip of the
teeth 8c to the shoulder side of the metallic wire 8, is represented by y. In the
conventional combing roller, in order to accomodate the pressing disk 10, the axial
size L
1 of the first free space is a sum of x and y.
[0017] In the case of the conventional combing roller 5 illustrated in Figs. 3 and 5, a
similar condition to the above-described combing roller 5 illustrated in Figs. 2 and
4 can be observed, except that in the case of Figs. 3 and 5 the base portion 8a of
the metallic wire 8 is pressed into the left hand helical groove 9 formed in the main
body 5a of the combing roller 5. Therefore, elements having the same functions as
those of the combing roller 5 illustrated in Figs. 2 and 4 are represented by identical
reference numerals, and the explanation thereof is omitted here.
[0018] Therefore, in the conventional combing roller, it is usual to have such construction
that the axial size of' the first free space is larger than the second free space,
because the axial size of the above-mentioned first free space is x + y, while that
of the second free space can be reduced to almost x. However, the problem we have
to solve is how to restrict the axial size of the first free space.
[0019] After a careful study of the construction and the function of the conventional combing
roller, two solutions were arrived at to satisfy the purpose of the present invention,
which will be hereinafter explained in detail.
[0020] The construction and function of the improved combing roller of the first type, according
to the present invention will now be explained in detail.
[0021] Referring to Figs. 2 and 6, wherein one of the embodiments of the improved combing
roller according to the present invention is illustrated, the combing roller 5 is
provided with a metallic wire 8 mounted on the main body 5a in such a condition that
the base portion 8a of the metallic wire 5 is pressed into the right hand helical
groove 9 by pressing the shoulder portion 8b by means of the pressing disc 10. It
must be noted that the cross section of the metallic wire 8 is different from that
of the conventional combing roller 5 illustrated in Figs. 2 and 4. That is, in this
embodiment, the shoulder portion 8b of the metallic wire 8 is projected toward the
side opposite to that of the metallic wire 8 illustrated in Fig. 4. In other words,
the metallic wire 8 has a laterally expanded base portion 8a which is projected toward
the direction of progress of an imaginary right hand screw turned in the clockwise
direction when in imaginary engagement with the right hand helical groove 9. If such
a construction is applied to the combing roller 5, the size L
1 of the first free space can be reduced to x, and the influence of the width y of
the shoulder portion 8b of the metallic wire 5 can be completely eliminated. On the
other hand the axial size L
2 of the second free space is x + y. However, as discussed in previous paragraphs,
even if the size L
1 of the first free space can be remarkably reduced, the basic requirements of preventing
any possible damage to the teeth portion 8c of the metallic wire and the helical groove
9 during the mounting operation must be met.
[0022] To find a solution to the question of how to meet the above-mentioned requirements,
repeated experiments were conducted. It was finally concluded that, if the pressing
of the metallic wire 8 into the helical groove 9 is started at the terminal end P
2 in the mounting operation of the metallic wire 8 to produce the conventional combing
roller 5 illustrated in Figs. 2 and 4, and completed at the starting point P
1 of the above-mentioned mounting operation of the metallic wire 8 to produce the combing
roller 5 illustrated in Figs. 2 and 4, the second requirement of preventing any possible
damage to helical groove 9 can be satisfied. The reason for this is the same as that
mentioned in the case of the mounting operation for the conventional combing roller
5 illustrated in Figs. 2 and 4.
[0023] A more delicate problem to solve was the first requirement of preventing damage to
the teeth portion 8c. It will be remembered that in the mounting operation of the
metallic wire 8 on the main body 5a of the conventional combing roller 5, the pressing
disc 10 continuously presses on the shoulder portion 8b of the metallic wire 8 in
the same direction as the working direction of the metallic wire so as to prevent
any possible damage to or deformation of the teeth portion 8c of the metallic wire
8 during the operation. However, in the mounting operation of the metallic wire 8
to produce the combing roller 5 illustrated in Figs. 2 and 6, since the operation
is carried out in the reverse direction to the operation for producing the conventional
combing roller 5 illustrated in Figs. 2 and 4, the pressing disc 10 must be continuously
moved in the reverse direction to the working direction W (Fig. 1) of the metallic
wire 8. However, after repeated experiments, it was concluded that such a mounting
operation does not actually create the possibility of damaging the teeth portion 8c
of the metallic wire 8. The main reason for this was found to be that, when the mounting
operation is carried out, the teeth portion 8c of the metallic wire 8 has a tendency
to incline slightly in the axial direction toward the flange 5b, so that possible
contact of the pressing disc 10 with the teeth portion 8c of the metallic wire 8 can
be sufficiently prevented.
[0024] As mentioned above, the metallic wire 8 illustrated in Figs. 2 and 6 has a unique
construction and the mounting thereof is also unique. Because of these two factors,
since the axial size L
I of the first free space is remarkably reduced, the problem due to insufficient opening
action of the conventional combing roller 5 can be effectively eliminated.
[0025] The other embodiment of the improved combing roller 5 according to the present invention
is illustrated in Figs. 3 and 7. In this embodiment, the metallic wire 8 having the
cross section illustrated in Fig. 7 is mounted on the left hand helical groove 9 in
such condition that the mounting operation is started at the terminal position P
2 of the wire 8 of the conventional combing roller of Figs. 3 and 5, and is completed
at the starting position p1of the wire 8 of the conventional combing roller 5 illustrated
in Figs. 3 and 5. During the mounting operation of the metallic wire 8 of the present
invention, the pressing disc 10 presser on the shoulder portion 8b of the metallic
wire 8 in the direction reverse to the working direction of the metallic wire 8. However,
for the same reason as in the case of the combing roller 5 illustrated in Figs. 2
and 6, no serious problems are created during the mounting operation of the metallic
wire 8 on the main body 5a of the combing roller 5. In the second embodiment of the
combing roller 5 illustrated in Figs. 3 and 7, since the axial size of the first free
space L
2 is remarkably restricted, the same as the first free space L
1 of the first embodiment of the present invention, a similar result to that of the
first embodiment can be created. Next the construction and functions of the improved
combing roller of the second type, according to the present invention, will be hereinafter
explained in detail.
[0026] Referring to Fig. 8, wherein the metallic wire 8 is rigidly inserted into a right
hand helical groove 9, the shoulder side of the metallic wire 8 faces the flange 5b
located on the ned of the roller corresponding to the direction of progress of an
imaginary right hand screw turned in the clockwise direction when in imaginary screw
engagement with the groove 9. In this case the working surface of teeth of the metallic
wire coincide with the rotational direction of the combing roller 5 which rotates
in the counter-clockwise direction as illustrated in Figs. 1 and 6. Therefore, as
already discussed, when a bundle of fibers S is supplied to the combing roller 5 while
the combing roller 5 is rotating in the counter--clockwise direction, the bundle of
fibers S is displaced toward the side of the flange 5b, while being carried in the
rotational direction of the combing roller 5. Such phenomenon is represented by two
a dot broken line in Fig. 8. Therefore, if a conventinal combing roller is utilized,
in the first free space formed between the flange 5b and the terminal portion of the
metallic wire 8 adjacent to the flange 5b, a group of fibers introduced into this
free space can not receive any combing action by the metallic wire 5. However, in
the combing roller 5 of the present invention illustrated in Fig. 6, five teeth, m
1, m
2 , m
3, m4 and m
5, of the terminal portion of the metallic wire 8, that is, the five teeth from the
first tooth m
1 at the starting point P
1 to the fifth tooth m
5 from the tooth m, , are bent toward the flange 5b. The bending angle of those teeth,
m
1, m
2, m
3, m4 and m
5 , is represented by a in Fig. 8. Therefore, the axial size L
1 of the first free space is reduced by providing such bent teeth in the terminal portion
of the metallic wire 8. Since the metallic wire 8 is rigidly mounted in the right
hand helical groove 9, the distance L between the tip of the bent teeth (m
1, m
2 , m
3, m4 and m
5) and the flange 5b is gradually increased as illustrated in Fig. 8. However, since
the combing roller 5 rotates in the counter-clockwise direction in this drawing, even
if only the above-mentioned terminal tooth m
1 is bent, the group of fibers introduced into this first free space cam receive the
opening action of this tooth m
1, so that the problem regarding neps when utilizing the conventional combing roller
can be eliminated. Since in this embodiment, the five teeth, m
1, m
2, m
3, m4 and m
5, are bent toward the flange 5b, the group of fibers introduced into the first free
space receive the effective action of those teeth. As illustrated in
Fig. 8, because the teeth m
1, m
2, m
3, m4 and m
5 are bent toward the flange 5b, the axial distance Q between those teeth and the laterally
adjacent teeth of the metallic wire 8 formed in the next helical portion of the helical
groove 9 is enlarged from the normal pitch R of groove 9. However, since the metallic
wire 8 is rigidly inserted into the helical groove 9, a group of fibers introduced
into the space corresponding to the above-mentioned enlarged axial distance Q recieves
at least one action of one of the teeth formed on the metallic wire portion adjacent
to the alignment of the teeth m
1 , m
2, m
3, m4 and m
5 when the combing roller 5 makes one rotation. If is known that the combing roller
5 rotates at a very high speed in comparison with the feeding speed of the sliver
S, for example, between 5000 and 10000 rpm, and therefore, in the practice, the group
of fibers introduced into the above--mentioned space can received sufficient opening
action by the teeth formed on the metallic wire portion adjacent to the alignemnt
of the teeth m
1, m
2, m
3 ' m
4 and
m5. Consequently, it is clear that the above-mentioned formation of the bent tooth or
teeth in the terminal portions of the metallic wire adjacent to the flange 5b is an
excellent solution to elimination of the problem concerning generation of slubby portions
of yarn with the conventional combing roller.
[0027] To carry out the above-mentioned construction of the combing roller 5, a tool of
special design is utilized to bend the tooth portion 8c of the teeth of the terminal
portion metallic wire. The operation of bending the tooth portion 8c is carried out
after rigidly mounting the metallic wire in the helical groove 9.
[0028] Regarding the second free space between the flange 5c and the terminal portion of
the metallic wire 8 adjacent to theflange 5c, the axial distance L
2 is not of serious concern regarding the possible creatin of slabby yarn. However,
the teeth of this terminal portion may be bent toward the flange 5c, even though if
there is only a very small probability of introducing fibers into thes second free
space.
[0029] In the above-mentioned embodiment illustrated in Fig. 8, five teeth m
1, m
2, m
3, m4 and m
5 are bent toward the flange 5b. However, according to the experience of the present
inventors, the number of such bent teeth may be changed. For example, in the case
of spinning a yarn of synthetic fibers having a thickness courser than the thickness
of cotton fiber, at least 9 teeth from the tooth formed at the starting terminal of
the metallic wire 5 may be bent toward the flange 5b, and if necessary, such number
of teeth bent toward the flange 5b may be increased to 20. It is also applicable to
non-successively bend a tooth or some teeth toward the flange 5b in the terminal portion
of the metallic wire 5 to attain the purpose of the present invention. In the embodiment
illustrated in Fig. 9, seven successive teeth, m
l . m
2, m3 m
4, m
5, m6 and m
7, in the starting portion of the metallic wire 8 are bent toward the flange 5b. In
this embodiment the bending angles a of those teeth toward the flange 5b are gradually
reduced to zero, for example the bending angle a
2 of the tooth m
2 is larger than the bending angle α
5 of the tooth m
5.
[0030] In the above-mentioned embodiments illustrated in Figs. 6, and 7, the teeth 8c of
the terminal portion of the metallic wire 5 adjacent to the flange 5b are bent toward
the flange 5b so that the axial size of the first free space L
1 can be effectively reduced, as can be clearly understood from the drawing of Fig.
10. However, if the terminal portion of the metallic wire 8 is rigidly inserted into
a portion 9a (Fig. 9) of the helical groove 9, wherein the groove of this portion
9a ia formed with a certain angle corresponding to the bending angle in Fig. 8 with
respect to a plane perpendicular to the rotational axis of the combing roller 5, even
if the tooth portion 8c of themetallic wire is not bent, a result similar to the embodiment
illustrated in Figs. 8, 9 and 10 can be created.
[0031] In the case of rigidly mounting the metallic wire 8 in a left hand helical groove
9 formed on the main body 5a of the combing roller 5, as illustrated in Fig. 3, a
similar technical idea to the above-mentioned embodiments illustrated in Figs. 8 and
9 is applied to the terminal portion of the metallic wire adjacent to the flange 5c
of the cmbing roller 5 which rotates in the clockwise direction, and a similar effect
to that of the embodiments illustrated in Figs. 8 and 9 can be created. Therefore,
a detailed explanation thereof is omitted.
[0032] As mentioned above, it is clear that, if at least one tooth of the terminal portion
of the metallic wire 5 adjacent the flange of the combing roller 5, located on the
side of the roller to which supplied fibers are axially displaced during the rotation
of the combing roller is directed toward that flange, the group of fibers introduced
into the first free space formed between the that flange and the adjacent portion
of the metallic wiere can be effectively opened by such that tooth or teeth of the
metallic wire. As a result, the possible creation of slubby yarn and possible yarn
breakage due to such creation of slubby yarn can be prevented.
1. An improvement of a combing roller utilized For an open-end spinning machine, wherein
a metallic wire is mounted on a body of said combing roller, said body comprises a
main cylincrical body and a pair of flanges coaxially formed at both ends of said
main body, a base portion of said metallic wire is pressed into a right hand or left
hand helical groove, and the working direction of said metallic wire coincides with
the rotational direction of said combing roller, said improvement comprising a first
free cylindrical space formed on said main body at a first position between one of
said flanges located at a side corresponding to the direction of progress of either
an imaginary right hand screw imaginarily engaged with said right hand helical groove
or an imaginary left hand screw imaginarily engaged with said left hand groove when
said imaginary screw is turned in the counter-clockwise. direction and a tooth point
of the end portion of said metallic wire, a second free cylindrical space formed on
said main body at a second position between the other flange and a tooth point of
the other end portion of said metallic wire, the axial size of said first cylindrical
space being smaller than that of said second cylindrical free space.
2. An improvement of a combing roller according to claim 1, wherein said metallic
wire is provided with a laterally expanded base portion projected toward a direction
opposite to said direction of progress of either said imaginary left hand screw in
said imaginary engagement or said imaginary right hand screw in said imaginary engagement
when said imaginary screw is turned in the counter-clockwise direction and a teeth
portion projected upward from said base portion.
3. An improvement of a combing roller according to claim 2, wherein said metallic
wire is provided with a substantially flat side surface at the side opposite to said
laterally expanded base portion.
4. An improved combing roller according to claim 1, wherein a terminal portion of
said metallic wire adjacent to said first cylindrical free space is provided with
at least one tooth inclined toward said flange formed at a position adjacent to said
first cylindrical free space of said combing roller.
5. An improved combing roller according to claim 4, wherein said terminal portion
of said metallic wire is provided with plural number of tooth started from an terminal
end thereof, all of said teeth are inclined toward said flange.
6. An improved combing roller according to claim 5, wherein inclined angle of said
teeth is constant.
7. An improved combing roller according to claim 5, wherein inclined angle of said
teeth is gradually decreased from said tooth at said terminal end thereof toward said
tooth at normal portion of said metallic wire successive to said terminal portion.
8. An improved combing roller according to claim 4, wherein said inclination of tooth
is created by bending said tooth toward said flange.
9. An improved combing roller according to claim 4, wherein said inclination of tooth
is created by rigidly inserted said base of said terminal portion of metallic wire
into a terminal portion of said helical groove formed with a certain angle with respect
to a plane perpendicular to the rotational axis of said combing roller.