EP0013169A1

EP0013169A1 - An improvement of a combing roller utilized for an open-end spinning machine

Info

Publication number: EP0013169A1
Application number: EP19790303027
Authority: EP
Inventors: Toshio Yoshizawa; Yoshiaki Yoshida; Katsuaki Sugiura; Noriaki Miyamoto
Original assignee: Toyoda Jidoshokki Seisakusho KK; Toyoda Automatic Loom Works Ltd
Current assignee: Toyota Industries Corp
Priority date: 1978-12-26
Filing date: 1979-12-21
Publication date: 1980-07-09
Also published as: EP0013169B1; DE2967093D1

Abstract

In an improved combing roller provided with a metallic wire (8) mounted on a body (5) thereof comprising a main cylindrical body (5a) and a pair of flanges coaxially formed at both ends of the main cylindrical body (5b,5c) a base portion of the metallic wire (8) rigidly pressed into a right hand or a left hand helical groove formed in the main body and the working direction of the metallic wire coincide with the rotational direction of the combing roller, if one of flanges (5b, 5c) on a side of the combing roller corresponding to the direction of progress of an imaginary right hand screw imaginarily engaged with the above-mentioned right hand helical groove or an imaginary left hand screw imaginarily engaged with the above-mentioned left hand helical groove when the imaginary screws are turned in the direction corresponding to the rotational direction of the combing roller, is defined as a first flange, while the other flange is defined as a second flange, the axial size (L1) of the free cylindrical space formed at the side of the first flange (5b) is smaller than the axial size (L2) of the free cylindrical space formed at the side of the second

Description

SUMMARY OF THE INVENTION

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

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.
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.
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,
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.
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.
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.

(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

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

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.
(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.

(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.

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.
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.
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 P₁1 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 a₁, 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.
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 L₁ of the first free space is a sum of x and y.
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.
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.
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.
The construction and function of the improved combing roller of the first type, according to the present invention will now be explained in detail.
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 L₁ 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 L₂ of the second free space is x + y. However, as discussed in previous paragraphs, even if the size L₁ 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.
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 P₂ 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 P₁ 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.
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.
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.
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 P₂of 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 L₂ is remarkably restricted, the same as the first free space L₁of 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.
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, m₁, m₂, m₃, m4 and m₅, of the terminal portion of the metallic wire 8, that is, the five teeth from the first tooth m₁ at the starting point P₁ to the fifth tooth m₅ from the tooth m, , are bent toward the flange 5b. The bending angle of those teeth, m₁, m₂, m₃, m4 and m₅, is represented by a in Fig. 8. Therefore, the axial size L₁ 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 (m₁, m₂, m₃, m4 and m₅) 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 m₁ is bent, the group of fibers introduced into this first free space cam receive the opening action of this tooth m₁, so that the problem regarding neps when utilizing the conventional combing roller can be eliminated. Since in this embodiment, the five teeth, m₁, m₂, m₃, m4 and m₅, 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 m₁, m₂, m₃, m4 and m₅ 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 m₁, m₂, m₃, m4 and m₅ 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 m₁, m₂, m_{3 '} m₄ and ^m ₅. 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.
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.
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 L₂ 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.
In the above-mentioned embodiment illustrated in Fig. 8, five teeth m₁, m₂, m₃, m4 and m₅ 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. m₂, m3 m₄, m₅, m6 and m₇, 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 a₂of the tooth m₂ is larger than the bending angle α₅of the tooth m₅.
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 L₁ 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.
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.
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.

Claims

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.