An improved creel of a ring spinning frame

Abstract: In a ring spinning frame provided with two parallel alignments of bobbin hangers 8, a plurality of roving guides 30 is arranged in an alignment at an intermediate position between the two alignments of bobbin hangers 8, wherein a first group of roving guides 30 is formed by roving guides 30 alternately positioned in the roving guide arrangement and a second group of roving guides 30 is formed by the remained roving guides 30 thereof, an improved creel mechanism 40 for relatively displacing the first group of roving guides 30 and the second group of roving guides 30 whereby a first intervening space between two adjacent roving guides 30 and a second intervening space between two adjacent roving guides 30 are alternately formed along the alignment of the roving guides 30, wherein the first intervening space ensures a free passage of a full packaged roving bobbin FB but the second intervening space does not permit a free passage of the full packaged roving bobbin FB, the above-mentioned formation of two intervening spaces being created alternately, at each intervening space between two adjacent roving guides 30, by the reciprocal motion of the displacing mechanism 40.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a creel mechanism of a ring spinning frame provided with conventional mechanism except the creel mechanism, more particularly an improvement of the creel mechanism of the conventional ring spinning frame. 2. Description of the Related Art Japanese Unexamined Patent Publication Sho 64 (1989)-52828 discloses a unique creel mechanism applied to a conventional ring spinning frame provided with a plurality of draft parts arranged at each side thereof, wherein two alignments of bobbin hangers are arranged along the longitudinal direction of said ring spinning frame, a plurality of roving guides, each provided with two hook-shaped guide elements, are arranged in an alignment at an intermediate position between said two alignments of said bobbin hangers, in parallel thereto, so that rovings from roving bobbins supported by corresponding pair of said bobbin hangers, one of which is a bobbin hanger of a backside alignment of said two alignments of bobbin hangers and the other is a corresponding bobbin hanger of a front side alignment of said two alignments of bobbin hangers, facing the above-mentioned front bobbin hanger, and each roving guide member is connected to a solid portion of the creel mechanism by way of a flexible element such as a spring. Accordingly, each roving guide member can be displaced from the standby position coinciding to the above-mentioned intermediate position by coming into contact with a full packaged bobbin, which is being displaced to the corresponding back bobbin hanger, without applying a positive bending force, and of returning from the displaced position to the standby position after the above-mentioned insertion of the full packaged roving bobbin. Japanese Examined Patent Publication Hei 2 (1990)-38500 discloses another type of creel mechanism of the conventional ring spinning frame wherein two alignments of bobbin hangers arranged in the same condition as the first mentioned prior art and a plurality of flat roving guide members, each provided with a pair of hooked shaped guide elements, arranged at an intermediate position between the above-mentioned two alignments of bobbin hangers, and said two roving guide elements of each roving guide member are arranged along a direction perpendicular to the lengthwise direction of the ring spinning frame. In the first mentioned prior art, however, since the two roving guide elements of each roving guide member are parallel to the alignments of the bobbin hangers, at the time of each unit operation of the roving bobbin exchange operation, wherein two almost exhausted roving bobbins supported by two adjacent bobbin hangers of the backside alignment of the bobbin hangers are simultaneously exchanged with full packaged roving bobbins, respectively, when the full packaged roving bobbins are to be simultaneously exchanged with the corresponding almost exhausted roving bobbins supported by the two adjacent bobbin hangers of the backside alignment, each of the full packaged roving bobbins must pass through a space between two adjacent roving guides. This space, however, is not sufficient to allow a free passage therethrough of a full packaged roving bobbin, and thus the outside surface of the full packaged roving bobbin is forced into contact with the roving guide members and pushes the roving guides against the resilient force of the spring element of the roving guide, and accordingly, the possibility of an abrasion of the outside roving layer of the full packaged roving bobbin by the roving guide members is created, and the outside roving layer of the full packaged roving bobbin may be damaged. In addition to the above-mentioned problem, it is also necessary to cover the spring elements with a cover piece, to prevent a possible deposition of free fibers on the spring elements. The second mentioned prior art has the following problem, i.e., since the intervening distance between two adjacent roving guide members is double the spindle pitch, the diameter of the full packaged roving bobbin is slightly smaller than the above-mentioned intervened space, e.g., 7 mm in a normal condition of the spinning operation. Therefore, to ensure a free passage of the full packaged roving bobbin through the above-mentioned space when carrying out the roving bobbin exchange operation, it is necessary to use a flat shaped roving guide member having a precise thickness and the roving guide members must be carefully arranged to maintain a uniform intervening space, to thereby guarantee the free passage of the full packaged roving bobbins between the respective two adjacent roving guide members. In our experience, however, it is evident that the preparation of such roving guide members having a precise uniform thickness, and the above-mentioned precise arrangement of the roving guide members, are very difficult, and therefore, it is apparent that the second mentioned prior art is not practical. SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide an improved creel mechanism by which the above-mentioned problems can be solved according to Claim 1. With the claimed improved creel mechanism , when a full packaged roving bobbin is required to pass through an intervening space between two adjacent roving guides towards a corresponding bobbin hanger of the back alignment thereof, any possible interference by the above-mentioned roving guides is eliminated. That is, in a ring spinning frame provided with a plurality of draft parts arranged at each side thereof, a front alignment of bobbin hangers for supporting the respective roving bobbins and a back alignment of bobbin hangers for supporting respective roving bobbins arranged at each side thereof in parallel along the lengthwise direction of the spinning frame, a plurality of roving guides arranged at an intermediate position between the above-mentioned two alignments of bobbin hangers, wherein the known system of arranging roving bobbins characterized by a two-step tapered arrangement of roving bobbins is applied, and a mechanism for relatively changing the intervening space between two adjacent roving guides is adopted. Therefore, before the roving bobbin exchange operation is carried out for each pair of almost exhausted roving bobbins held by the respective bobbin hangers, one of which is the bobbin hanger of the back alignment, while the other one is the bobbin hanger of the front alignment and faces the above-mentioned back bobbin hanger, before the full packaged roving bobbin is displaced to the above-mentioned back bobbin hanger, the intervening space between two adjacent roving guide corresponding to the bobbin hangers is enlarged by relatively displacing the above-mentioned two roving guides by the action of the displacing mechanism mentioned above. Accordingly, each full packaged roving bobbin can be freely displaced through the above-mentioned intervening space between the corresponding two adjacent roving guides, and thus any possible damage to the full packaged roving bobbin due to a possible contact with the roving guides can be satisfactorily prevented. BRIEF EXPLANATION OF THE DRAWINGS Fig. 1 is a plan view of an embodiment of the creel mechanism of the present invention; Fig. 2 is a plan view of the creel mechanism shown in Fig. 1, in a condition that the mechanism is actuated; Fig. 3 is a side view of a creel portion of a ring spinning frame shown in Fig. 4, wherein a supplemental rail is omitted; Fig. 4 is a partly omitted cross sectional side view of a ring spinning frame; Fig. 5 is a front view of the creel mechanism shown in Fig. 1, Fig. 6 is a plan view of another embodiment of the creel mechanism according to the present invention, indicating a standby condition thereof; Figs. 7 and 8 are plan views of the creel mechanism shown in Fig. 6, indicating the actuated condition thereof; Fig. 9A is a plan view of further modified embodiment of the creel mechanism according to the present invention; Fig. 9B is an enlarged plan view of a unit link motion mechanism shown in Fig. 9A; Fig. 10 is a longitudinal cross sectional view of the creel mechanism shown in Fig. 9A; and Fig. 11 is partly omitted cross sectional side view of a ring spinning frame utilizing the creel mechanism shown in Fig. 9A. DESCRIPTION OF THE PREFERRED EMBODIMENTS The mechanism and function of the improved creel mechanism applied to a ring spinning frame provided with two alignments of bobbin hangers, i.e., the two-step tapered arrangement of roving bobbins, according to the present invention is hereinafter explained with reference to the attached drawings. As shown in Figs. 3 and 4, a plurality of vertical pillars 3 are rigidly mounted on a machine frame 2 of a ring spinning frame 1 in an alignment along the lengthwise direction thereof. A horizontal supporting bracket 4 is secured at an intermediate position of each vertical pillar 3 and a horizontal creel bar bracket 5 secured to the supporting bracket 4 is extended outwards from the bracket 4 at each side of the spinning frame 1. A pair of creel bars 6 and 7, each having a respective length extended for the entire length of the creel portion, are rigidly supported by the creel bar brackets 5 at respective positions therebelow in parallel and along the lengthwise direction of the spinning frame 1. A plurality of bobbin hangers 8, which number is 1/2 of the total number of spindles SP at each side of the spinning frame 1, are rigidly supported by each one of the creel bars 6 and 7, such that an identical intervened pitch P is provided between two adjacent bobbin hangers 8 of each creel bar in a condition such that a vertical imaginary plane, involving an axis of a bobbin hanger 8 of the creel bar 6 and an axis of a bobbin hanger 8 of the creel bar 7 facing the above-mentioned bobbin hanger 8 of the creel bar 6, is perpendicular to the lengthwise direction of the spinning frame. The above-mentioned pitch P is double that of the spindle pitch. To simplify the following explanation, the bobbin hangers 8 of the creel bar 6 and the bobbin hangers 8 of the creel bar 7 are hereinafter referred to as the front bobbin hanger 8 and the back bobbin hangers 8 respectively, and the back bobbin hanger 8 facing the above-mentioned front bobbin hanger 8 are hereinafter referred to as a pair of facing bobbin hangers "PB". A horizontal rail bracket 11 extended to both sides of the ring spinning frame 1 is rigidly secured to the top of each vertical pillar 3, and a supplemental rail 12 is rigidly secured to the free end portion of the horizontal brackets 11 at each side of the spinning frame in parallel to the lengthwise direction of the spinning frame 1. The supplemental rail 11 has a function of temporarily receiving a bobbin carriage 13 provided with a plurality of bobbin hangers for supporting full packaged roving bobbins, displaced from a roving room, and for discharging the bobbin carriage 13 having almost exhausted roving bobbins, by way of the above-mentioned bobbin hangers, therefrom. The bobbin carriage 13 is provided with plurality of bobbin hangers 13a in a condition such that a pitch between two adjacent bobbin hangers 13a is identical to the pitch between two adjacent pairs of facing bobbin hangers "PB". In practice, full packaged roving bobbins FB are carried to the supplemental rail 12 before carrying out the roving bobbin exchange operation, by displacing the bobbin carriage 13 to the supplemental rail 12, so as to use for carry out the roving bobbin exchange operation with respect to either one of the front alignment 9 of the roving bobbins and the back alignment 10 of the roving bobbins. As shown in Figs. 4 and 5, a metal bracket 21 is secured to a bottom surface of each creel bar bracket 5. The metal bracket 21 is provided with a rectangular recessed portion 22 opened upwards, and slide bar supporting metals 23 are disposed in the rectangular recessed portion 22. A pair of slide bars 24 and 25 are slidably disposed in the respective spaces between two adjacent slide bar supporting metals 23 in a condition such that these slide bars 24 and 25 extend in parallel to the lengthwise direction of the spinning frame 1. Each one of the slide bars 24 and 25 occupies the space covering the front alignment 9 of the roving bobbins and the back alignment 10 of the roving bobbins, and each one of slide bars 24 and 25 is provided with a plurality of roving guides 30, to a number identical to one half of the total number of spindles arranged at each side of the spinning frame, rigidly mounted thereon with a pitch between two adjacent roving guides 30 of each alignment thereof which is double the pitch "P" between two adjacent pairs of facing bobbin hangers "PB". Each roving guide 30 is provided with a guide head 32 secured to a tip portion of a L-shaped supporting rod 31, the top end of which is secured to either one of the slide bars 24 and 25. As shown in Fig. 1, in the alignment of the roving guides 30, the roving guides 30 are alternately secured to the side bars 24 and 25. As shown in Fig. 4, the position of the head 32 of each roving guide 30 is designed to occupy an intermediate position between a front alignment 9 of the roving bobbins and a back alignment 10 of the roving bobbins in a condition such that each roving guide 30 is positioned in a space between two adjacent pairs of facing bobbin hangers "PB". The guide head 32 of each roving guide 30 is provided with a cutout portion having a semi-circular shape, and a pair of projected engaging portions 34 are engaged with the center of the above-mentioned cutout portion, formed at both terminals of the cutout portion, one of the projected engaging portions 34 of each guide head 32 functioning to guide a roving supplied from the roving bobbin supported by a front bobbin hanger 8 of a pair of facing bobbin hangers "PB" to a trumpet 15 of a corresponding draft part, and the other of the projected engaging portions 34 functioning to guide a roving supplied from the roving bobbin supported by a back bobbin hanger 8 of an adjacent pair of facing bobbin hangers "PB", to a trumpet 15 of a corresponding draft part of the spinning frame 1. The shape of the projected engaging portion 34 can be modified and can be made in a shape of a hook. A mechanism 40 for relatively displacing the slide bars 24 and 25 along the alignment of the roving guides 30 is disposed at an end portion of the spinning frame 1, and the ends of the slide bars 24 and 25 are connected to the displacing mechanism 40. That is, in the displacing mechanism 40, a motor bracket 41 is rigidly mounted on a supporting bracket 4 of the creel bracket 5 rigidly supported by the creel pillar 3 disposed at an end portion of the spinning frame 1, for example, an end portion in the proximity of a gear end frame of the spinning frame 1. A motor 42 is provided with a speed reduction mechanism (not shown), and can be reciprocally rotated in the normal and reverse directions by a predetermined number of rotations. A disc 43 is rigidly mounted on an output shaft 42a of the motor 42, the output shaft 42a being directed downward. A pair of pins 44 are mounted on the disc 43 at respective positions biased from the center of the disc 43. A lever 45a, turnably mounted on one of the pins 44, is turnably connected to an end portion of the slide bar 24 with a pin 27a, while another lever 45b, turnably mounted on another one of pins 44, is turnably connected to an end portion of the slide bar 24 with a pin 27b. In relation to the above-mentioned displacing mechanism 40, the relative arrangement of the roving guides 30 is designed to satisfy the following condition, i.e., an imaginary plane involves the axial centers of the front and back bobbin hangers 8 forming the above-mentioned pair of facing bobbin hangers "PB" are positioned to pass through a center of the intervening space between two adjacent roving guides 30 of the alignment thereof. The intervening space between the above-mentioned two adjacent roving guides 30 is changed by the displacing mechanism 40 such that the intervening space between two adjacent roving guides 30 a corresponding pair of facing bobbin hangers "PB", to which the roving bobbin exchange operation must be applied, is enlarged to a space L1 sufficient to guarantee a free passage of a full packaged roving bobbin FB therethrough, and the intervening space adjacent to the first-mentioned space, corresponding to the adjacent pair of facing bobbin hangers "PB" is narrowed to L2, which is smaller than the diameter of the full packaged roving bobbin FB but larger than the diameter of the almost exhausted roving bobbin SB. It must be noted that the above-mentioned two adjacent intervening spaces L1 and L2 are defined by each of three roving guides 30 successively aligned along the alignment of the roving guides 30. As explained hereinbefore, the above-mentioned creel mechanism is utilized for carrying out the roving bobbin exchange operation at each side of the ring spinning frame 1, wherein the two-step tapered arrangement of the roving bobbins is applied. Therefore, before starting the spinning operation, full packaged roving bobbins FB are suspended by a plurality of pairs of facing bobbin hangers "PB", alternately along the lengthwise direction of the spinning frame 1, and the almost half exhausted roving bobbins HB are suspended by the remaining plurality of pairs of facing bobbin hangers "PB". Until the above-mentioned half exhausted roving bobbins HB reach an almost exhausted condition, the intervening space between two adjacent roving guides 30, which involves an imaginary plane passing the axial centers of the front and back bobbin hangers 8 of the second mentioned pair of the facing bobbin hangers "PB", is enlarged to the above-mentioned space L1, and conversely, the intervening space between two adjacent roving guides 30, which is adjacent to the above-mentioned enlarged intervening space, is narrowed to L2 by relatively displacing the slide bars 24 and 25, which relative displacing motion of the slide bars 24 and 25 is created by the action of the displacing mechanism 40. When the above-mentioned almost half exhausted roving bobbins HB become almost exhausted condition, after the completion of the roving piecing operation and the threading operation of the respective rovings to the corresponding roving heads 32, the above-mentioned almost exhausted roving bobbins SB are taken from the respective bobbin hangers 8 and mounted on the corresponding bobbin hangers of a supplemental rail 12 of the spinning frame 1, and thereafter a pair of full packaged roving bobbins HB taken from the supplemental rail 12 are displaced to the creel portion of the spinning frame 1 from a direction perpendicular to the alignments of the bobbin hangers 8, thereby transfer the full packaged roving bobbins FB to the respective pairs of the facing bobbin hangers "PB" from which the almost exhausted roving bobbins have been taken. As explained hereinbefore, the intervening space involves the imaginary plane passing the axial centers of the bobbin hangers 8 of the above-mentioned pair of the facing bobbin hangers "PB", from which the almost exhausted roving bobbins 8 have been taken, is enlarged to L1, and therefore, the full packaged roving bobbin FB can be freely displaced through the above-mentioned enlarged intervening space and suspended by the corresponding back bobbin hanger 8, without damage to the outer surface thereof. After completing the above-mentioned roving bobbin exchange operation, successively applied to all pairs of facing bobbin hangers "PB" from which the almost exhausted roving bobbins have been taken, and until a condition such that the half exhausted roving bobbins suspended by the remaining pairs of facing roving bobbins "PB" become almost exhausted condition, the intervening space involves the imaginary plane passing the axial centers of the front and back bobbin hangers 8 of the second mentioned pair of facing bobbin hangers "PB" is enlarged from the space L2 to L1, by a motion of the displacing mechanism 40 reverse to the previous motion mentioned above. When the roving bobbins suspended by the bobbin hangers 8 of the second mentioned pairs of facing bobbin hangers "PB" become almost exhausted condition, the roving bobbin exchange operation is carried out for the front and back bobbin hangers of the second mentioned pairs of facing bobbin hangers "PB" under a condition identical to the conditions for the above-mentioned operation applied to the first mentioned pairs of facing bobbin hangers "PB". In the above-mentioned creel mechanism, the drive of the motor 42 of the displacing mechanism 40 is controlled by a control device (not shown) mounted on the spinning frame 1. That is, when the motor 42 receives a first electric signal, to be driven in the clockwise direction, the motor 42 drives the disc 45 in the clockwise direction, via the speed reduction mechanism 43, until the input of the first electric signal is stopped. On the other hand, when the motor 42 receives a second electric signal, to be driven in the counter-clockwise direction, the motor 42 drives the disc 45 in the counter-clockwise direction, via the speed reduction mechanism 43, until the input of the second electric signal is stopped. As already explained, the disc 45 is provided with a pair of pins 44a and 44b, and a pair of sensors 51 and 52 are mounted on the creel mechanism at the respective positions where at the sensor 51 detects the pin 44a when the disc 43 is turned in the clockwise direction in Fig. 1, while the sensor 52 detects the pin 44b when the disc 43 is turned in the counter-clockwise direction in Fig. 1. The above-mentioned inputs of the first and second electric signals are issued through the above-mentioned control device at the respective desired times, for example, at each completion of the roving bobbin exchange operation, to create the desired intervening space between two adjacent roving guides 30 and carry out the next roving bobbin exchange operation. The above-mentioned input of the first electric signal is stopped by the control device when the sensor 51 detects the pin 44a, and the above-mentioned input of the second electric signal is stopped by the control device when the sensor 52 detects the pin 44b. Since the electric circuit having the above-mentioned function of the control device can be designed without any particular knowledge in the normal skilled person in the art, a detailed explanation of the control device is omitted. In the above-mentioned embodiment shown in Figs. 1, 2, 3, 4 and 5, each roving guide 30 is always positioned at a position biased from the intermediate position between two adjacent imaginary planes defined by two pairs of facing bobbin hangers 30, and when the intermediate space between two adjacent roving guides 30 is to be changed from the distance L2 to the distance L1, and vice versa, these sliding bars 24 and 25 are simultaneously displaced in the respective opposite directions each other, by turning the disc 43 as already explained. In a modification of the first embodiment, however, each roving guide 30 is always positioned at an intermediate position between two adjacent imaginary planes defined by two adjacent pairs of facing bobbin hangers "PB", and when the intervening space between two adjacent roving guides 30 is to be changed from the distance "Lo", not shown, which is identical to the pitch "p" defined hereinbefore, to the distance L1 or vice versa, the pair of roving guides, defined by a pair of facing roving bobbins "PB" for which the roving bobbin exchanging operation is to be carried out, are displaced to the respective directions to expand the intervening space therebetween to L1. Therefore, it must be recognized that the above-mentioned position of each roving guide 30 before the displacement motion thereof is a standby position which is maintained during the normal spinning operation. When the intervening space between two adjacent roving guides 30 defined by a pair of facing roving guides "PB" for which the roving bobbin exchange operation is required, is to be enlarged the slide bars 24 and 25 are displaced towards the respective directions from the respective standby positions, so that the intervening space therebetween can be changed from p to L1, and under the condition that the adjacent intervening space between two roving guides 30, one of which is one of two roving guides 30 of the first mentioned pair of facing roving bobbins "PB", is narrowed to L2. To displace the sliding bars 24 and 25 and create the above-mentioned relative displacement thereof, the disc 43 should be turned in such a way that, to enlarge the first mentioned intervening space, the disc 43 is turned from the standby condition in one direction, for example, the counter-clockwise direction, and stopped when the sensor 52 detects the pin 53a, and after completion of the roving bobbin exchange operation, the disc 43 is turned in the clockwise direction and returned to the standby condition. On the other hand, if the second mentioned space is to be enlarged, the disc 43 is turned from the standby condition in a direction reverse to the turning motion thereof mentioned above, for example, in the clockwise direction, and when the sensor 52b detects the pin 53b, the turning motion of the disc 43 is stopped so that the second mentioned intervening space is enlarged from the distance "p" to L1, and after completion of the roving bobbin exchange operation, the disc 43 is turned in the counterwise direction to be returned to the standby position. The second embodiment of the creel mechanism of the ring spinning frame, wherein the above-mentioned two-step taper arrangements of the roving bobbins is applied under conditions identical to those of the first embodiment of the present invention, is hereinafter explained in detail with reference to Figs. 6, 7 and 8. As it can be easily understood from these drawings, the relative positions of two adjacent roving guides 30 and a mechanism for displacing the slide bars 24 and 25 to create the respective space allowing the free passage of a full packaged roving bobbin FB to the back bobbin hanger 8 to which the roving bobbin exchange operation is to be applied, are different from the first embodiment of the present invention. As shown in Fig. 6, the roving guides 30 are alternately connected to the slide bars 24 and 25 such that, during the time between the successive roving bobbin exchange operations, each roving guides 30 is at a standby position such that the center thereof is on an imaginary plane defined by the axial centers of the front bobbin hanger and the back bobbin hanger of a pair of facing bobbin hangers "PB". Therefore, the pitch of the arrangement of the roving guides 30 in the standby condition is identical to the pitch between two adjacent imaginary planes defined by the respective pairs of front and back bobbin hangers 8 which form two adjacent pairs of facing bobbin hangers "PB" respectively. The slide bar 24 is connected at one end thereof to a pneumatic cylinder 70a, by way of a piston 71a thereof, and the slide bar 25 is connected at one end to another pneumatic cylinder 70b, by way of a piston 71b. These pneumatic cylinders 70a and 70b form the displacing mechanism 40, and the ends of the slide bars 24 and 25 connected to the displacing mechanism 40 are positioned at both sides of the spinning frame 1. The pneumatic cylinders 70a and 70b displace the respective slide bars 24 and 25 in the following condition. Namely, before the roving bobbins suspended by the respective front and back bobbin hangers 8 of the first group pairs of facing bobbin hangers "PB" become almost exhausted condition, each roving guide 30 connected to the slide bar 24 is displaced to a corresponding adjacent roving guide 30 connected to the slide bar 25, which is at the standby position, by displacing the slide bar 24 for a predetermined distance L3, as shown in Fig. 7, sufficient to create a space to allow the free passage of a full packaged roving bobbin FB towards the corresponding back bobbin hangers 8 for which the roving bobbin exchange operation is required, and before the roving bobbins supported by the front and back bobbin hangers 8 of the second group pairs of facing bobbin hangers "PB" become almost exhausted condition, each roving guide 30 connected to the slide bar 25 is displaced to a corresponding adjacent roving guide 30 connected to the slide bar 24, which is at the standby position, by displacing the slide bar 25 for the above-mentioned distance L3 in a direction opposite to the direction of the first-mentioned displacement of the slide bar 24, and after completion of the respective roving bobbin exchange operations, the slide bars 24 and 25 are displaced to the standby positions, respectively, by the action of the displacing mechanism 40. Accordingly, the stroke of the piston rod 71a of the pneumatic cylinder 70a and that of the piston rod 71b of the pneumatic cylinder 70b are defined to satisfy the above-mentioned conditions. To ensure a smooth operation of the displacing mechanism 40, a known pneumatic cylinder provided with a speed controller, and a known pneumatic cylinder provided with a hydro-check unit, can be used for the displacing mechanism 40. It must be noted that such smooth operation of the displacement mechanism creates smooth and slow displacement of roving guides 30 so that any possible breakage of rovings can be prevented. As explained hereinbefore, the displacement motions of the slide bars 24 and 25 are carried out alternately in relation to the roving bobbin exchange operation applied to the first group pairs of facing bobbin hangers "PB" and that operation applied to second group pairs of facing bobbin hangers "PB" of the ring spinning frame 1. The third embodiment of the present invention is hereinafter explained in detail with reference to the drawings of Figs. 9A, 9B, 10 and 11. The creel mechanism is provided with a slide bar 26a, extended along the lengthwise center line of the spinning frame 1, slidably supported by the slide bar supporting brackets 23a having a similar construction and function to the slide bar supporting bracket 23 of the first embodiment of the present invention, and a stationary bar 26b extended along the slide bar 26a and stationarily supported by the slide bar supporting brackets 23a, and a displacing mechanism 40 having a mechanism identical to that of the first embodiment of the present invention, except for the disc 43. Therefore, the delaited explanation regarding the component element applied to the third element which is identical to that of the first embodiment, is omitted. The disc 43 is provided with a single pin 44c and a connecting bar 45c is turnably connected at one end thereof to the disc 43 by the pin 44c, and the other end of the connecting bar 45c is turnably connected to one end of the slide bar 26a by a pin 27c. Therefore, the slide motion of the slide bar 26a is created by the turning motion of the disc, in a condition identical to that of the first embodiment of the present invention. In this creel mechanism, the roving guide alignment is formed by a plurality of pairs of two adjacent roving guides 30 successively arranged along the slide bar 26a. Each pair of the roving guides 30 is mounted on a link mechanism 80 actuated by the relative displacement of the slide bar 26a to the slide bar 26b which is stationarily supported by a supporting bracket (not shown) secured to the bracket 5 (Fig. 5), whereby the intervening space between two adjacent roving guides 30 of each pair thereof can be changed by the motion of the link mechanism 80. As shown in Figs. 9A, 9B, the link mechanism 80 is formed by a first link bar 81, a second link bar 82, and the third link bar 83 turnably connected to the first link bar 81 and second link bar 82 by a pair of pins 85a, 85b such one free end thereof is turnably connected to an intermediate portion of the first link bar 81 and another end portion thereof is turnably connected to a free end portion of the second link bar 82. The first link bar 81 is provided with a slit 81a formed at a free end portion thereof, and is further turnably connected to the slide bar 26a by a pin 84a rigidly mounted on the slide bar 26a, in a condition such that the pin 84a is slidably inserted to the slit 81a. The first link bar 81 is further provided with a downwardly extended vertical rod 81b secured thereto at an intermediate portion between the slit 81a and the pin 85a, and one of the roving guides 30 is secured to a bottom end of the vertical rod 81b in parallel to the first link bar 81. On the other hand, the free end separated from the other end of the second link bar 82, to which the third link bar 83 is pivotally connected by the connecting pin 85b, while the intermediate portion of the second link bar 82 is rigidly mounted on a downwardly extended vertical rod 82a which is turnably mounted on the stationary bar 26b, and the other of the roving guides 30 is secured to a bottom end of the vertical rod 82a in parallel to the second link bar 82. The positions of these two roving guide 30 are, of course, fixed at an identical level. In the above-mentioned link motion mechanism, the setting of the position of the pin 84a can be changed. Since, in the creel mechanism according to the third embodiment of the present invention, the displacing mechanism 40 is constructed to cooperate with the above-mentioned slide bar 26a, the stationary bar 26b, and the link motion mechanism 80 mentioned above, the intervening space between two adjacent roving guides 30 of each pair of the roving guides can be changed by the displacement of the slide bar 26a between the distance L1 and L2 explained in the explanation of the first embodiment of the present invention, which is carried out by the turning of the disc 43 under the same condition as in the first embodiment of the present invention. On the other hand, to vary the intervening space between two adjacent roving guides 30, one of which is one of a pair of roving guides 30 and the other is one of an adjacent pair of roving guides, to make it identical to the above-mentioned change of the intervening space between two roving guides 30 of each pair of roving guide, the size of the link bars 81, 82 and 83, the position at which the first link bar 81 is connected to the third link bar 83, the position at which the first link bar 81 is connected to the slide bar 26a, the position at which the second link bar 82 is connected to the stationary bar 26b, are predetermined. In the above-mentioned third embodiment the motion of the displacing mechanism 80 is controlled like that of the first embodiment, so accordingly, a detailed explanation thereof is omitted. In the above-mentioned three embodiments of the creel mechanism according to the present invention, the following modifications can be made. That is, in the first and second embodiments, the slide bars 24 and 25 are slidably mounted on the creel bar brackets 5 and the roving guides 30 are alternately suspended by the slide bars 24 and 25, respectively, but if these slide bars 24 and 25 will not disturb the roving exchange operation, these slide bars 24, 25 can be arranged at respective other positions in the creel portion where the above-mentioned conditions can be satisfied, for example, at a position in the proximity of the creel pillars 3, and each vertical supporting rod 31 rigidly mounted on the respective slide bars 24, 25 in an upright condition. In the second embodiment of the present invention, the pneumatic cylinders 70a, 79b are arranged at both ends of the spinning frame 1, but these pneumatic cylinders 70a and 70b can be arranged at the same end of the spinning frame 1. Any type of displacing mechanism having the function of reciprocally displacing the slide bars 24, 25 can be utilized. In the above-mentioned creel mechanism, the intervening space between two adjacent roving guides 30 alternately connected to the side bars 24 and 25 is simultaneously changed, but if the roving bobbin exchange operation is carried out by stepwise operations successively applied to groups of spindles from one end side to the other end side of the spinning frame 1, the changing of the intervening space between two adjacent roving guides is also carried out in a condition such that a group of the above-mentioned intervening spaces defined by roving guides, from which the respective rovings are supplied to the respective draft parts corresponding to each one of the above-mentioned groups of spindles, are simultaneously changed, before carrying out the roving bobbin exchange operation for the corresponding group of spindles, and such a group operation of changing the intervening spaces is successively carried out in relation to the above-mentioned stepwise roving bobbin exchange operation. The motion of the roving guides 30 belonging to each group is controlled by an exclusive displacing mechanism having a construction and function identical to those of the first or second embodiment of the present invention. In the third embodiment of the present invention, if each pair of roving guides 30 is utilized to guide the respective roving from the respective roving bobbins supported by the front and back bobbin hangers 30, as in the first embodiment, the above-mentioned unit link motion mechanism is applied only to the draft parts of each side of the spinning frame, except for draft parts positioned in the proximity of the gear end and outer end of the spinning frame, and therefore, two stationary roving guides are mounted on the creel mechanism at the respective positions corresponding to these draft parts. As explained hereinbefore, since the intervening space between two adjacent roving guides is enlarged to allow a free passage of a full packaged roving bobbin, until the roving bobbin exchange operation is required, when this bobbin is introduced to the corresponding bobbin hanger of the back alignment thereof when carrying out the roving bobbin exchange operation, any possible damage created by contact with the roving guide or guides can be effectively prevented. Moreover, the delicate arrangement of the roving guides in the creel portion of the spinning frame and the limitation of the size of the full packaged roving bobbin, as required in the conventional ring spinning frame, can be ignored. Also, an advantage of the present invention is that the operation of changing the intervening space between two adjacent roving guides need not be carried out in a very restricted time, because this operation is allowed to be completed before starting the corresponding roving bobbin exchange operation.

Claims: An improved creel mechanism applied to a ring spinning frame (1) provided with a plurality of draft parts arranged at each side thereof, a plurality of front and back bobbin hangers (8) arranged in respective front and back alignments thereof with an identical pitch and in parallel to the longitudinal direction of said spinning frame (1), a plurality of roving guides (30) arranged in an alignment along said alignments of front and back bobbin hangers (8), each of said roving guides (30) being provided with a pair of guide elements (34) for guiding respective rovings (35) fed from corresponding roving bobbin hangers (8) arranged as a pair of said front and back bobbin hangers (8) mounted to corresponding draft parts, wherein an imaginary plane defined by an axial center of a front bobbin hanger (8) and a back bobbin hanger (8) facing said front bobbin hanger (8) is perpendicular to the longitudinal direction of said spinning frame (1), said alignment of said roving guides (30) taking an intermediate position between said two alignments of said front and back bobbin hangers (8), wherein a two step tapered arrangement of full packaged roving bobbins (FB) and half exhausted roving bobbins (MB) is created, which is characterized by supporting said full packaged roving bobbins (FB) by alternate pairs of said front bobbin hangers (8) and said back bobbin hangers (8) facing said front bobbin hangers (8), along an alignment of said pairs of front and back bobbin hangers (8), while supporting said half exhausted roving bobbins (MB) by other alternate pairs of said front and back bobbin hangers (8), so that a roving bobbin exchanging operation between almost exhausted roving bobbins (SB) and fresh full packaged roving bobbins (FB) is alternately applied to two group pairs of front and back bobbin hangers (8), by displacing at least one of said slide bars (24,25;26a,26b) along a lengthwise direction characterized in that; a pair of supporting members (21) arranged in said creel portion of said spinning frame (1), a first slide bar (24;26a) supported by said supporting members (21) and extended along said alignment of said roving guides (30), a second slide bar (25,26b) supported by said supporting members (21) in parallel to an entire length of said first slide bar (24;26a), said roving guides (30) are separated into two groups, one of which is formed by a plurality of roving guides (30) alternately arranged along said alignment of roving guides (30), and the other one of which is formed by the other plural roving guides (30) of said alignment of roving guides (30) so that a combination of two groups of roving guides (30) is created, a mechanism (40) for displacing at least one of said groups of roving guides (30) in relation to said slide bars (24,25;26a,26b), along a lengthwise direction of said ring spinning frame (1) at a time before carrying out said roving bobbin exchanging operation, said mechanism (40) being designed to create a condition in which a larger intervening space is formed between each adjacent pair of roving guides (30) facing a corresponding pair of said pair of front and back bobbin hangers (8) supporting said almost exhausted roving bobbins (SB), which larger space allows free passage of said fresh full packaged roving bobbin (FB) when said roving bobbin exchanging operation is carried out, while a smaller intervening space is formed at each position between each of said adjacent roving guides (30) facing a corresponding pair of said front and back bobbin hangers (8) to which a next roving bobbin exchanging operation is applied, means (51,52) for controlling action of said displacing mechanism (40), whereby said larger intervening spaces are changed into smaller intervening spaces and said smaller intervening spaces are changed into said larger intervening spaces, each time said mechanism is actuated. An improved creel mechanism applied to a ring spinning frame according to claim 1, characterized in that said smaller intervening space formed between adjacent roving guides (30) which is created by the action of said displacing mechanism (40) is a space allowing free passage of at least said almost exhausted roving bobbin (SB). An improved creel mechanism applied to a ring spinning frame according to claim 2, characterized in that said first group of said roving guides (30) is supported by said first slide bar (24), while said second group of said roving guides (30) is supported by said second slide bar (25), said slide bars (24, 25) are slidably supported respective supporting members (21), said mechanism (40) for displacing said first and second groups of roving guides (30) is formed by, a motor (42) being provided with speed reduction means and being able to be reciprocally turned in a normal direction and in a direction opposite to said normal direction, a disc (43) driven by said motor (42) and coaxially secured to a motor shaft of said motot (42); a pair of connecting pins (44a,44b) mounted on said disc (43) at a predetermined angular distance; a first connecting rod (45) turnably mounted at one end thereof on one of said pins (44a,44b) and a second connecting rod (45) turnably mounted at one end thereof on another one of said pins (44a,44b), whereby said first slide bar (24) is pivotally connected at one free end thereof to the other end of said first connecting rod (45), and said second slide bar (25) is pivotally connected to the other end of said second connecting rod (45); a pair of sensing pins (51,52) rigidly mounted on said disc (43), with a predetermined angular distance therebetween; and a pair of sensors (53) disposed respectively at positions for detecting a corresponding one of said sensing pins (51,52); whereby said sensing pins (51,52) and said sensors (53) function as elements of said control means for controlling the action of said displacing mechanism (40) so that when either one of said sensors (53) detects a corresponding one of said sensing pins (51,52), driving of said motor (42) is started or stopped, wherein relative positions of said sensing pins (51,52) in relation to the respective positions of said connecting pins (44a,44b) mounted on said disc (43) are designed to satisfy the condition of creating said larger intervening space between adjacent roving guides (30) and said smaller intervening space between adjacent roving guides (30), when said motor (42) is driven in either of said rotating directions. An improved creel mechanism applied to a ring spinning frame according to claim 2, characterized in that, said first group of roving guides (30) are rigidly supported by said first slide bar (24), while said second group of roving guides (30) are rigidly supported by said second slide bar (25), said arrangement of said roving guide (30) is designed such that a pitch between adjacent roving guides (30) is maintained at a size which is identical to that of a pitch between adjacent pairs of front bobbin hanger (8) and a back bobbin hanger (8) facing said front bobbin hanger (8) during spinning operation of said spinning frame (1), while substantially regulating a central position of each roving guide (30) on said imaginary plane defined by an axial center of said front and back bobbin hangers (8) of each pair thereof, before and during said roving bobbin exchanging operation, said displacing mechanism (40) is provided with a pair of pneumatic cylinders (70), each provided with a piston rod (71) having a predetermined stroke, one free end of said first slide bar (24) is connected to one of said pneumatic cylinders (70) via said piston rod (71), while one free end of said slide bar (25) is connected to the other one of said pneumatic cylinders (70) via said piston rod (71), control means for actuating said pneumatic cylinders (70) related to either one of said slide bars (24,25) supporting one of said groups of roving guides (30), which correspond to respective pairs of front and back bobbin hangers (8) supporting almost exhausted roving bobbins (SB) when said half pairs of front and back bobbin hangers (8) become said almost exhausted roving bobbins (SB) so that said roving bobbin exchanging operation is required to be carried out, said displacing mechanism (40) is designed to satisfy a condition that said predetermined stroke of said piston rod (71) of each pneumatic cylinder (70) is matched to alternately create said larger intervening space between adjacent roving guides (30) and said smaller intervening space between said adjacent roving guides (30) along said alignment of said roving guides (30), when either one of said pneumatic cylinders (70) is actuated, while the other one of said pneumatic cylinders (70) is maintained in a stationary condition. An improved creel mechanism applied to a ring spinning frame according to claim 2, characterized in that said second slide bar (26b) is connected to a stationary supporting member (23a) so that said second slide bar (26b) is always maintained in a stationary condition, said displacing mechanism (40) is provided with a motor (42) able to be reciprocally turned in a normal direction and in a direction reverse to said normal direction, a disc (43) driven by said motor (42), a connecting pin (44c) rigidly mounted on said disc (43) at a predetermined position, a connecting rod (45) provided at one end thereof pivoted on said connecting pin (44c), the other end thereof pivoted to one end of said first slide bar (26a), said sensing pin (51) mounted on said disc (43), said sensor (53) for sensing said sensing pin (51), an electric control means for controlling rotational motion of said disc (43) by a signal issued from said sensor (53), and a plurality of intermediate link bar mechanisms (80), each of said intermediate link mechanisms (80) is formed by a first link bar (81) to which said roving guides (30) are rigidly mounted, a second link bar (82) to which said roving guide (30) is rigidly mounted on one free end thereof and a third link bar (83) wherein two free end portions thereof are pivotally connected to said first and second link bars (81,82) in cooperation with said first and second slide bars (26a,26b), dimensions of said first, second and third link bars (81,82, and 83) and relative conditions thereof for connecting to each other, in relation to said first and second slide bars (26a,26b) are designed to satisfy the condition that said larger intervening space between adjacent roving guides (30) and said smaller intervening space between adjacent roving guides (30) are alternately created in said alignment of said roving guides (30) when said motor (42) rotates in one of rotational directions thereof, each of said intermediate link bar mechanisms (80) is designed such that a vertical pin (84a) rigidly mounted on said first link bar (26a) is slidably inserted into a slot (81a) formed at a free end portion of said first link bar (81) so that said first link bar (81) is able to turn about said vertical pin (84a), an intermediate portion of said second link bar (82) is rigidly mounted on a vertical rod (82a) which is turnably mounted on said second slide bar (26b), and one end portion of said third link bar (83) is pivotally connected to a portion of said first link bar (81) at a position in proximity to said roving guides (30) connected thereto by way of a pivot pin (85a), while the other end portion of said third link bar (83) is pivotally connected to a free end portion of said second link bar (82) via a pivot pin (85b).

Inventors: SASAKI KENJI, YAMADA KOICHI, SASAKI, KENJI, YAMADA, KOICHI
Applicants: HOWA MACHINERY LTD, HOWA MACHINERY LIMITED
Application year: 1991
Main classification: D01H9
IPC codes: D01H9, B65H49, D01H13