RESIDUAL ROVING CLEARING APPARATUS

Abstract: A residual roving clearing apparatus for clearing a residual roving re­ maining on a roving bobbin. The residual roving clearing apparatus com­ prises a bobbin holding device (10) for rotatably holding a roving bobbin (B₀), a cutting device (20) for cutting layers of coils of residual rov­ ing remaining on the roving bobbin held by the bobbin holding device, and a rotary brush device (30) for clearing the residual roving from the rov­ ing bobbin. The residual roving clearing apparatus is capable of effe­ ciently clearing the residual roving from the roving bobbin by cutting layers of coils of the residual roving along a cutting line parallel to the axis of the roving bobbin held by the bobbin holding device, and stripping off the cut layers of coils of the residual roving from the rov­ ing bobbin by the rotary brush of the rotary brush device.

Description: The present invention relates to a residual roving clearing apparatus for clearing a roving remaining on a roving bobbin, comprising a bobbin conveying apparatus for continuous conveyance of bobbin hangers to a clearing apparatus, the clearing apparatus comprising a cutting device for cutting layers of coils of roving remaining on a roving bobbin by setting a blade with its cutting edge in near contact with the circumference of the roving bobbin and moving the blade in parallel to the axis of the bobbin, a rotary brush device including a rotary brush which is rotated and held in contact with the surface of the layers of coils of rovings on the roving bobbin to clear the layers of coils of roving cut by the cutting device from the roving bobbin. A roving package is formed by winding a roving on a roving bobbin on a roving frame, the roving exhausted on a spinning frame, and then the empty roving bobbin is returned to the roving frame. The residual roving must be cleared from the roving bobbin before returning the roving bobbin to the roving frame. The free end of a roving wound on a new roving package and a roving wound on a roving package on the creel of the spinning frame are spliced before the roving package in process is exhausted to avoid interrupting the feed of the roving. Accordingly, some roving remains on the roving bobbin removed from the creel of the spinning frame. In some cases, a large amount of roving remains on the roving bobbin when the roving packages in process are removed from the spinning frame in changing the setting of the spinning frame for spinning yarns of a different quality or when a roving package in process is removed from the spinning frame before exhaustion due to trouble in unwinding the roving from the roving package. An apparatus of the above type is disclosed by the DE-A-27 55 208. A cutting apparatus, a roller apparatus and a brush apparatus are provided along a conveyor, so that a roving bobbin must be moved along the conveyer to pass the cutting, the roller and the brush apparatus step by step. On the other hand, a bobbin conveying apparatus is used widely in spinning mills for saving labour. This bobbin conveying apparatus returns continuously roving bobbins removed from a spinning frame together respectively with bobbin hangers arranged in a line. The applicant of the present patent application proposed a residual roving clearing apparatus intended for use in combination with such a bobbin conveying apparatus in Japanese Patent Laid-open (Kokai) No. 63-75125. This previously proposed residual roving clearing apparatus transfers roving bobbins being conveyed on bobbin hangers to a device and clears residual rovings efficiently from the roving bobbins by pressing a running bristled belt against the roving bobbins to rotate the roving bobbins, to find the free ends of the rovings wound on the roving bobbins and to unwind the residual rovings from the roving bobbins. This residual roving clearing apparatus, however, operates at a very low efficiency and takes an excessively long time to clear the residual roving from the roving bobbin when a large amount of roving remains on the roving bobbin, because many layers of coils of the residual roving must be removed sequentially from the outermost layer to the innermost layer. Accordingly, it is a principal object of the present invention to provide a residual roving clearing apparatus capable of efficiently clearing residual rovings remaining on roving bobbins in a comparatively short time. In order to comply with this object, the apparatus according to the invention is characterized by a bobbin holding device comprising a rotary holder having a holding head capable of being removably fitted in the lower end of the bore of a roving bobbin delivered to the bobbin holding device in a vertical position, and three rotating rollers capable of rotating in contact with a top ring attached to the upper end of the roving bobbin, the bobbin holding device being disposed on the conveying path along which the bobbins are conveyed by the conveying apparatus, the three rotating rollers of said bobbin holding device comprising a stationary rotating roller and two movable rollers capable of being brought into contact with and being separated from the top ring of a roving bobbin, the rotary brush device having a cover plate covering a portion of the circumference of the rotary brush, and a duct extending from the cover plate and connected to a suction device, and the rotary brush can be brought into contact with the surface of layers of coils of roving on a roving bobbin held by said bobbin holding device and moved away from the roving bobbin. Fig. 1 to 6 are illustrations of a residual roving clearing apparatus in a preferred embodiment according to the present invention, in which Fig. 1 is an enlarged perspective view of an essential portion of the residual roving clearing apparatus; Fig. 2 is a partly cutaway side elevation of the residual roving clearing apparatus; Fig. 3 is a general plan view of the residual roving clearing apparatus; Fig. 4 is an enlarged fragmentary side elevation showing an essential portion of the residual roving clearing apparatus shown in Fig. 2; Fig. 5 is an enlarged fragmentary sectional side elevation of an essential portion of the residual roving clearing apparatus shown in Fig. 2; Fig. 6 is a sectional view taken on line VI-VI in Fig. 2; and Figure 7 is a side elevation of a modification of a cutter assembly employed in the residual roving clearing appartus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to Fig. 1, a residual roving clearing apparatus (hereinafter, referred to simply as "clearing apparatus") embodying the present invention comprises, as principal components, a bobbin holding device 10, a cutting device 20 and a rotary brush device 30, which are assembled integrally on a frame F₁ as shown in Figs. 2 and 3. Roving bobbins B₀ carrying residual rovings are suspended on bobbin hangers BH₀, respectively, for continuous conveyance by a bobbin conveying apparatus BC₀. The clearing apparatus clears the residual rovings from the roving bobbins B₀ without removing the roving bobbins B₀ from the bobbin hangers BH₀. The bobbin holding device 10 has a stationary roller 11 supported for rotation at a fixed position, and movable rollers 12 capable of being moved toward and away from a roving bobbin B₀ (Figs. 1, 2 and 3). The stationary roller 11 is supported rotatably on bearings contained in a bearing housing 11a, which in turn is held fixedly on the upper beam of the frame F₁ by a bracket 11b so that the stationary roller 11 depends from the bearing housing 11a. The movable rollers 12 are journaled on a swing arm 13 so as to depend from the swing arm 13. The swing arm 13 has one end pivotally supported with a pin 13a on the frame F₁ and the other end pivotally joined to the free end of the piston rod of a pneumatic actuator 13b mounted on the frame F₁. A recess 13c is formed in the swing arm 13 at a position in the middle between the movable rollers 12. As best shown in Figs. 3 and 6, a photoelectric switch PS₁, which will be described afterward, is attached to the swing arm 13 to detect the completion of clearing the roving bobbin B₀. The stationary roller 11 and the two movable rollers 12 may be substituted by two stationary rollers and a single movable roller. The bobbin holding device 10 has a rotary bobbin holder 14 disposed so as to be detachably inserted in the lower bore of the roving bobbin B₀ suspended in a vertical position. The rotary bobbin holder 14 has a conical head provided with a flange 14a and supported rotatably on bearings on a sliding shaft vertically slidably guided by a slide guide 14b fixed to the frame F₁. The lower end of the sliding shaft of the rotary bobbin holder 14 is connected to the piston rod of a pneumatic actuator 14c attached to the frame F₁. The cutting device 20 has a guide rail 21 and a cutting head 22. The guide rail 21 is an elongate plate member provided with a pin 21a projecting in opposite directions substantially from the middle of the major sides of the guide rail 21, respectively. The guide rail 21 is supported swingably by the pin 21a on a bracket 21b fixed to the frame F₁ so that the guide rail 21 can be extended in parallel to the axis of the roving bobbin B₀. The guide rail 21 is connected pivotally at the upper end thereof to the free end of the piston rod of a pneumatic actuator 21c connected to the frame F₁. As shown in Fig. 4, the cutting head 22 comprises two side plates 22a disposed on the opposite sides of the guide rail 21, guide rollers 22b in rolling contact respectively with the front and rear minor sides of the guide rail 21, and a blade 22d held on the side plates 22a by a bracket 22c. The blade 22d projects to the front from the cutting head 22 so that the cutting edge therefore is positioned in near contact with the circumference of the roving bobbin B₀ when the guide rail 21 is extended in parallel to the axis of the roving bobbin B₀. As shown in Figs. 1 and 2, the cylinder of a pneumatic actuator 23 is fixed to the rear minor side of the guide rail 21 with its axis extending along the longitudinal direction of the guide rail 21. The free end of the piston rod of the pneumatic actuator 23 is connected to a bracket 23a fixed to the cutting head 22. The rotary brush device 30 has a rotary brush 31 as a principal component. The shaft of the rotary brush 31 is supported in a vertical position at the upper and lower ends thereof in bearings 31a on a bracket 32 (Figs. 1, 2 and 3). A belt 31b is extended between a pulley attached to the lower end of the shaft of the rotary brush 31 and a pulley attached to the output shaft of a motor 31c. The rotary brush 31 and the motor 31c are mounted on the bracket 32. The bracket 32 is supported for turning motion on a shaft 32a attached to the frame F₁. One end of the bracket 32 remote from the rotary brush 31 is connected to the free end of the piston rod of a pneumatic actuator 32b. The rotary brush 31 is driven for rotation by the motor 31c and can be brought into contact with the circumference of the roving bobbin B₀ by the pneumatic actuator 32b. As shown in Fig. 6, the circumference of the rotary brush 31 is covered partly with a cover plate 33 attached to the extremity of a suction duct 33a connected to a suction device, not shown. In operation, the piston rod of the pneumatic actuator 14c is retracted to hold the rotary holder 14 at a lower position, the piston rod of the pneumatic actuator 13b is retracted to retract the movable rollers 12, the piston rod of the pneumatic actuator 21c is retracted to tilt the guide rail backward, the piston rod of the pneumatic actuator 32b is retracted to hold the rotary brush 31 at a standby position and the piston rod of the pneumatic actuator 23 is projected to position the cutting head 22 at an uppermost position to set the clearing apparatus for standby state. Then the bobbin conveying apparatus is actuated to convey roving bobbins B₀ carrying residual rovings by one pitch of a successive arrangement of the roving bobbins b₀ in the direction of an arrow K₁ (Fig. 3) to locate one of the roving bobbins b₀ at a position in front of the cutting device 20 and directly above the rotary bobbin holder 14. Then, the piston rod of the pneumatic actuator 14c is projected to raise the rotary bobbin holder 14 as far as the conical head of the rotary bobbin holder 14 is fitted in the lower end of the bore of the roving bobbin B₀. Then, the piston rod of the pneumatic actuator 13b is projected to turn the swing arm 13 to the front, namely, in the direction of an arrow K₂ (Fig. 3) so that the rotary rollers 12 are moved toward the roving bobbin B₀ to positions indicated at 12′ to locate the roving bobbin B₀ by holding the upper ring B₁ of the roving bobbin B₀ between the movable rollers 12 and the stationary roller 11 as indicated by long and two short dashes lines in Fig. 3. Consequently, the roving bobbin B₀ is held rotatably by the rotary bobbin holder 14, the movable rollers 12 and the stationary roller 11. In this state, the roving bobbin B₀ is on the conveying path of the bobbin conveying apparatus BC₀ and is suspended on the bobbin hanger BH₀, and hence the orientation and position relative to the bobbin hanger BH₀ of the roving bobbin B₀ remain unchanged. Then, the piston rod of the pneumatic actuator 21c is projected to turn the guide rail 21 on the pin 21a in the direction of an arrow K₃ (Fig. 5) so that the guide rail 21 stands upright in parallel to the axis of the roving bobbin B₀ as indicated by solid lines in Fig. 5. In this state, the cutting edge of the blade 22d of the cutting head 22 is brought into near contact with the circumference of the roving bobbin B₀. Then, the piston rod of the pneumatic actuator 23 is retracted to move the cutting head 22 downward along the guide rail 21 to a lowermost position 22′ as indicated by alternate long and two short dashes lines in Fig. 5, whereby the layers of coils of the roving remaining on the roving bobbin B₀ are cut with the blade 22d along a cutting line parallel to the axis of the roving bobbin B₀. The stroke of the piston rod of the pneumatic actuator 23 is decided so that the cutting edge of the blade 22d is positioned opposite a position immediately below the ring B₁ of the roving bobbin B₀ when the cutting head 22 is at the uppermost position and positioned opposite the lower end of the roving bobbin B₀ when the cutting head 22 is at the lowermost position. Then, the piston rod of the pneumatic actuator 21c is retracted to tilt the guide rail 21 backward to a position indicated by alternate long and two short dashes lines in Fig. 5 to retract the blade 22d from the working position, and then the piston rod of the pneumatic actuator 32b is projected to turn the bracket 32 mounted with the rotary brush 31 and the associated components on the shaft 32a in the direction of an arrow K₄ (Figs. 3 and 6) so that the rotary brush 31 is pressed against the roving bobbin B₀ as indicated by solid lines in Fig. 6. At the same time, the motor 31c is actuated to rotate the rotary brush 31 in the direction of an arrow K₅ (Fig. 6) in contact with the roving bobbin B₀, whereby the residual roving is removed continuously from the roving bobbin B₀ by the rotary brush 31. Since the coils of the residual roving have been cut previously with the blade 22d of the cutting device 20 and the roving bobbin B₀ is rotated forcibly by the rotary brush 31, the residual roving can be cleared efficiently from the roving bobbin B₀ in a very short time even if the quantity of the residual roving is large. Even if the coils of the residual roving in the bottom layer are not cut with the blade 22d, those coils of the residual roving can be removed in a short time with the bristles of the rotary brush 31. The residual roving thus cleared from the roving bobbin B₀ is sucked through the cover plate 33 and the suction duct 33a by the suction device, not shown, in the direction of an arrow K₆ (Fig. 6) and is accumulated as waste in a waste collecting device, not shown. While the residual roving is being cleared from the roving bobbin B₀, the residual roving passes across a light beam PSa projected by the photoelectric switch PS₁, and thereby the photoelectric switch PS₁ is able to detect the residual roving passing through the suction duct 33a. Upon the completion of clearing the residual roving from the roving bobbin B₀, no roving passes across the light beam PSa, and thereby the photoelectric switch PS₁ detects the complete removal of the residual roving from the roving bobbin B₀. Upon the detection of completion of clearing the residual roving from the roving bobbin B₀, the motor 31c is stopped, the piston rod of the pneumatic actuator 32b is retracted to separate the rotary brush 31 from the roving bobbin B₀, the piston rod of the pneumatic actuator 13b is retracted to retract the movable rollers 12 and the piston rod of the pneumatic actuator 14c is retracted to lower the rotary bobbin holder 14 to release the roving bobbin B₀. Since the photoelectric switch PS₁ stops the motor 31c upon the indirect detection of completion of clearing the residual roving from the roving bobbin B₀, the photoelectric switch PS₁ may be replaced with a switch with a timer for operating the motor 31c for a predetermined period of time for each residual roving clearing cycle. After the roving bobbin B₀ has been thus released, the bobbin conveying apparatus BC₀ is actuated to advance the successive roving bobbins B₀ by one pitch to position the next roving bobbin B₀ at the residual roving clearing position, and then the residual roving clearing cycle is repeated. The cutting head 22 is returned to the uppermost position while the guide rail 21 is tilted backward to retract the blade 22d from the cutting position. Pressure for pressing the rotary brush 31 against the surface of the roving package, namely, the surface layer of the residual rovings on the roving bobbin B₀, can be adjusted to an optional value by adjusting the pressure of air supplied to the pneumatic actuator 32b, and the rotary brush 31 can be pressed against the surface of the roving package regardless of the variation of the diameter of the roving package resulting from the gradual removal of the layers of coils of the residual roving. The blade 22d of the cutting head 22 may be a circular blade provided with a pair of recesses 22e formed at diametrically opposite positions, respectively, as shown in Fig. 7. This circular blade 22d is fixed with a screw 22g to the bracket 22c and is retained in place with a fixed pin 22f so that one of the recess 22e is positioned opposite to the ring B₁ of the roving bobbin B₀ when the cutting head 22 is at the uppermost position and the guide rail 21 is positioned in parallel to the axis of the roving bobbin B₀. Thus, the circular blade 22d is able to cut all the coils of the residual roving immediately below the ring B₁, and the life of the blade 22d can be doubled by changing the angular position of the blade 22d. In the operation of the clearing apparatus described, the roving bobbins B₀ are conveyed on the bobbin hangers BH₀ by the bobbin conveying apparatus BC₀, and each roving bobbin B₀ is held as suspended on the bobbin hanger BH₀ by the bobbin holding device 10 for residual roving clearing. However, the roving bobbin B₀ may be removed automatically or manually from the bobbin hanger BH₀, and then the individual roving bobbin B₀ may be held by the bobbin holding device 10 for residual roving clearing. Accordingly, the clearing apparatus of the present invention is applicable to clearing the residual roving even if the bobbin hanger BH₀ is unable to rotate. A residual roving clearing apparatus may comprise a plurality of units each comprising the bobbin holding device 10, the cutting device 20 and the rotary brush device 30, and arranged side by side at intervals corresponding to the pitches of the roving bobbins B₀ on the bobbin conveying apparatus BC₀, and may simultaneously clear a plurality of roving bobbins B₀ of the residual rovings. Such a construction of the residual roving clearing apparatus further reduces virtual clearing time per roving bobbin. As is apparent from the foregoing description, according to the present invention, layers of coils of roving remaining on a roving bobbin rotatably held by a bobbin holding device are cut longitudinally of the roving bobbin by a cutting device, and then the layers of coils of roving are removed continuously by a rotary brush, which reduces residual roving clearing time remarkably. Furthermore, a residual roving clearing apparatus of the present invention can be included in a bobbin conveying line using a bobbin conveying apparatus to clear residual rovings efficiently from roving bobbins being conveyed along the bobbin conveying line without interfering with the bobbin conveying operation of the bobbin conveying apparatus.

Claims: 1. A residual roving clearing apparatus for clearing a roving remaining on a roving bobbin, comprising a bobbin conveying apparatus (BC₀) for continuous conveyance of bobbin hangers to a clearing apparatus, the clearing apparatus comprising a cutting device (20) for cutting layers of coils of roving remaining on a roving bobbin by setting a blade (22d) with its cutting edge in near contact with the circumference of the roving bobbin and moving the blade in parallel to the axis of the bobbin, a rotary brush device (30) including a rotary brush (31) which is rotated and held in contact with the surface of the layers of coils of rovings on the roving bobbin to clear the layers of coils of roving cut by the cutting device from the roving bobbin, characterized by a bobbin holding device (10) comprising a rotary holder (14) having a holding head capable of being removably fitted in the lower end of the bore of a roving bobbin (B₀) delivered to the bobbin holding device in a vertical position, and three rotating rollers (11, 12) capable of rotating in contact with a top ring attached to the upper end of the roving bobbin, the bobbin holding device (10) being disposed on the conveying path along which the bobbins are conveyed by the conveying apparatus, the three rotating rollers (11, 12, 12′) of said bobbin holding device comprising a stationary rotating roller (11) and two movable rollers (12, 12′) capable of being brought into contact with and being separated from the top ring of a roving bobbin, the rotary brush device (30) having a cover plate (33) covering a portion of the circumference of the rotary brush (31), and a duct (33a) extending from the cover plate and connected to a suction device, and the rotary brush (31) can be brought into contact with the surface of layers of coils of roving on a roving bobbin held by said bobbin holding device (10) and moved away from the roving bobbin. 2. A residual roving clearing apparatus according to claim 1, characterized in that said cutting device (20) comprises a guide rail (21) disposed longitudinally of the roving bobbin held by the bobbin holding device so as to be moved toward and to be moved away from the roving bobbin, and a cutting head (22) capable of moving along the guide rail. 3. A residual roving clearing apparatus according to one of the preceding claims, characterized in that said bobbin holding device (10) has a switch capable of detecting a residual roving remaining on a roving bobbin, and said bobbin holding device decides whether or not cut layers of coils of roving remain on the roving bobbin through the detection of the position of said rotary brush by the switch. 4. A residual roving clearing apparatus according to one of claims 2 to 3, characterized in that said cutting head (22) comprises a blade holding member (22a), guide rollers (22b) supported rotatably on the blade holding member for rolling along the guide rail (21), and a blade (22d) attached to the blade holding member, and the cutting head is moved along the guide rail by a pneumatic actuator (23). 5. A residual roving removing apparatus according to one of claims 1 to 4, characterized in that said cutting device (20) is supported pivotally on a pin (21a) for swing motion on a frame member (21b). 6. A residual roving clearing apparatus according to one of claims 1 to 5, characterized in that said rotary bobbin holder (14) is supported axially slidably on a frame member (F1) so as to be driven for axial sliding movement by a pneumatic actuator (14c), said movable rotating rollers (12,12′) are supported rotatably on a swing arm (13) pivotally supported for swing motion on a frame member, and the swing arm is driven for swing motion by a pneumatic actuator (13b). 7. A residual roving clearing apparatus according to one of claims 1 to 6, characterized in that said rotary brush (31) is driven for rotation through a belt (31b) by an electric motor (31c), said rotary brush and the electric motor are mounted on a swing bracket (32) supported for swing motion by a shaft (32a) on a frame member, and the swing bracket is driven for swing motion by a pneumatic actuator (32b). 8. A residual roving clearing apparatus according to one of claims 3 to 7, characterized in that said switch for detecting a residual roving remaining on a roving bobbin is connected electrically to said electric motor (31c) for driving said rotary brush (31) for the on-off control of said electric motor. 9. A residual roving clearing apparatus according to one of the preceding claims, characterized in that a plurality of units each of said bobbin holding device (10), said cutting device (20) and said rotary brush device (30) are arranged side by side along a conveying path along which a bobbin conveying apparatus conveys roving bobbins.

Inventors: SANNO, HIROAKI
Applicants: KABUSHIKI KAISHA MURAO AND COMPANY
Application year: 1989
Main classification: B65H73
IPC codes: D01H11, B65H73