US 3928899 A
A machine for cutting yarn residues from yarn tube sleeves (bobbins) comprises bearing means to receive the ends of yarn tubes and guide them to a cutter carriage carrying a vertical knife and a horizontal knife. The carriage travels transversely across the path of feed of the yarn tubes on the bearing means in a cutting pass and back in a return pass to its starting position. A vertically shiftable driving dog is carried clear of the yarn tube during the cutting pass of the cutter carriage. On the return pass, the driving dog shifts downwardly to engage the yarn tube and drive it through a stripping tube and eject it from the machine. A limit switch is engaged by the carriage at the end of its return travel which synchronizes the start of another cycle to cut the yarn from the next yarn tube which is automatically transported into place on the bearing means.
Claims available in
Description (OCR text may contain errors)
United States Patent 1 [1 1 Maiworm Dec. 30, 1975  YARN CUTTING-OFF MACHINE  Inventor: Giinter Maiworm, Schontaler Weg 22, 5982 Neuenrade, Germany 22 Filed: Apr. 4, 1975 21 Appl. No.: 565,108
Primary ExaminerLouis K. Rimrodt [5 7] ABSTRACT A machine for cutting yarn residues from yarn tube sleeves (bobbins) comprises bearing means to receive the ends of yarn tubes and guide them to a cutter carriage carrying a vertical knife and a horizontal knife. The carriage travels transversely across the path of feed of the yarn tubes on the bearing means in a cutting pass and back in a return pass to its starting position. A vertically shiftable driving dog is carried clear of the yarn tube during the cutting pass of the cutter carriage. On the return pass, the driving dog shifts downwardly to engage the yarn tube and drive it through a stripping tube and eject it from the machine. A limit switch is engaged by the carriage at the end of its return travel which synchronizes the start of another cycle to cut the yarn from the next yarn tube which is automatically transported into place on the bearing means.
22 Claims, 2 Drawing Figures US. Patent Dec. 30, 1975 Sheet 10f2 US. Patent Dec. 30, 1975 Sheet 2 of2 YARN CUTTING-OFF MACHINE This invention relates to a yarn cutting-off machine suitable for use with yarn tubes (also called bobbins or pirns). Yarn cutting off machines comprise an open top trough-shaped bearing means to receive the extremities of a yarn tube, and guide rods extending parallel to the axis of the bearing means for shiftable arrangement thereon of a cutter carriage which carries-a vertical pre'cutting knife in a plane including the axis of the bearing means, and a horizontal re-cutting knife extending normal to this plane.
The machine according to the present invention is to cut yarn residues from yarn tubes, in particular from yarn tubes provided with or in the form of a tubular sleeve. A problem to be solved by the invention described herein is to ensure that the yarn residue will be removed completely from the yarn tube on one hand and that no damage will be caused to the sleeve of the tube on the other hand.
A yarn cutting-off machine of the type referred to above has been known in the art. This prior known machine provides for manual placement of the yarn tubes into the bearing means and manual removal therefrom after the cutting-off operation. Since the yarn residues often adhere very strongly to the yarn tube sleeve it is additionally necessary to manually strip them off the tube after cutting so that the efficiency of such a machine is restricted. It is an object of the present invention to provide a yarn cutting-off machine with automatic yarn tube (bobbin) feed and one which provides for complete removal of all cut-off yarn residues from the yarn tubes so that the tubes will not require any subsequent operations once they have been discharged from the yarn cutting-off machine. This and other objects are attained and the described problems solved by the features of the claimed invention.
In general, the apparatus of the invention provides that after the cutting operation and on its return back to its starting position, the cutter carriage pushes the yarn tubes out through an axial passage opening of the bearing means which is disposed at the end thereof facing opposite to the direction of cutting to thereby strip off all yarn residues. Another yarn tube is loaded by a step-by-step transport means to permit substantially continuous movement of the cutter carriage. Accordingly, a very large number of yarn tubes can be processed. The yarn cutting-off machine of the present invention is capable of handling 1200 yarn tubes per hour and more without difficulty.
Another object of the invention is to provide, in alignment with the axial passage opening of said hearing means a stripper tube having an inside diameter that is equal to the outside diameter of the yarn tube. This stripper tube ensures complete stripping of all yarn residues and permits depositing of the empty yarn tubes in a receiving vessel or on a conveyor system disposed in a convenient place adjacent the yarn cutting-off machine.
Generally, a machine suitable for cutting yarn residue off yarn tubes is provided which comprises bearing means to support a yarn tube, a cutter carriage having at least one cutting knife, and preferablytwo cutting knives, mounted thereon and arranged to move the cutter carriage relative to the yarn tube held on the bearing means to cut residual yarn from the yarn tube by means of the cutting knife or knives-Onehorizontal and one vertical knife is preferred. A driving dog is provided together with means to hold the driving dog clear of the yarn tube during the cutting pass of the cutter carriage, and to engage the driving dog with the yarn tube on the return pass of the cutting carriage so as to eject the yarn tube from the bearing means. Transport means totransport a plurality of yarn tubes in succession into the bearing means in position for cutting are also provided. Such transport means are incremental of step-by-step transport means which are arranged to advance a plurality of yarn tubes by increments to introduce successive ones of yarn tubes into the bearing means in position for cutting of the yarn residue package therefrom by the knife or knives carried by the cutter carriage. The transport means is synchronized with the cutter carriage to advance a fresh yarn tube into the bearing means after clearance of the previous, ejected tube therefrom. In this context, a fresh yarn tube means one from which the residual yarn package has not yet been cut.
An embodiment of the invention shall now be described with reference to the accompanying drawings in which:
F IG. 1 is an elevation view showing a yarn cutting-off machine of the present invention with enclosures partly removed and showing by dot dash outline different operating positions of a component thereof, and
FIG. 2 is a plan view of FIG. l'which additionally shows a step-by-step transport means.
The machine frame, which for clarity is not shown in all details, comprises two side plates 1 which support two guide rods 2 extending therebetween and on which a cutter carriage 3 is shiftably mounted by suitable bearing means. To move said cutter carriage there is a drive chain 4 carried about sprockets 5 of which one is driven from a motor 6. (FIG. 1) The drive chain 4 is provided with a driving dog 7 adapted to engage in a slide rail 8 of the cutter carriage 3 so that one complete revolution of said driving dog 7 on the drive chain 4 corresponds to one movement of said cutter carriage 3 to and fro in a cutting and return pass, respectively.
Two trough-shaped bearing means 9 and 10 are provided whose yarn tube support-axes are aligned parallel with the guide rods 2. That is, the longitudinal axis of a yarn tube supported at one end by bearing means 10 and at its other end by bearing means 9 will lie parallel to guide rods 2. Bearing means 10 is adjustable relative to hearing means 9 under the action of an adjusting means 11. This permits adjustment of the distance between bearing means 9 and 10 to accomodate different size yarn tubes. The trough-shaped bearing means 10 has an abutment wall 12 against which one end of yarn tube 13 lies. The bearing means 9 is provided with a passage opening 14 with which a stripper tube 15 having an inner diameter equal to the outer diameter of a yarn tube 13 is aligned. A longitudinal slot 16 is machined in the top surface of stripper tube 15 to permit free clearance for a vertical knife 18. A blower nozzle 17 is fixedly secured to the machine frame by means of retainers (not shown) and is positioned to direct a jet of air against the passage opening 14. Additional blower nozzles can be provided if necessary, e.g., in the bearing means 9 around the trough-shaped front surface, or at the opening 14. Such nozzles are adjusted to direct air jets to the surface of the to-be-stripped tube, assisting in the stripping effect of the yarn therefrom.
Cutter carriage 3 carries a vertical pre-cutting knife 18 whose axis extends horizontally and whose vertical plane intersects the axis of the yarn tube 13. Mounted on a resiliently disposed arm 19 is a horizontal re-cutting knife 20 whose axis is vertical and intersects the axis of the yarn tube 13. Arm 19 is adjustable vertically against the action of the compression spring 21, and carries at one end thereof a roller 22 which coacts with cam rails 23 and 24 during movement of the cutter carriage 3. Cam rails 23 and 24 are bevelled at their respective ends facing toward the opposite extremities of yarn tube 13. Cam rails 23 and 24 may be otherwise appropriately shaped according to the contour of yarn tube 13 is the same is not cylindrical. The knives are driven from a motor (not shown) secured to the cutter carriage 3.
Arranged on cutter carriage 3 is a vertically shiftable driving dog 25 extending normal to the axis of yarn tube 13 and carrying a roller 26 at the top end thereof. In the waiting zone of the cutter carriage (in which zone the cutter 3 is shown in full dot dash outline at the right-hand portion of FIG. 1) there is a cam rail 27 fitted substantially in the path of movement of roller 26, while another cam rail 28 above said cam rail 27 extends the full length of the cutter carriage cutting travel stroke. Cam rail 28 carries a switch tongue 29 which normally rests against cam rail 27 and which is raised, as illustrated in FIG. 1, during return of the roller 26. Cam rail 27 is bevelled at its end facing the direction of travel of cutter carriage 3 during its cutting pass. Cam rail 28 is bevelled at both ends.
Arranged in alignment with bearing means 9 and 10 is a step-by-step transport means 30 (FIG. 2) which comprises two stationary rails 31 with recesses to receive other yarn tubes 32, and two rails 33 movable along a parallellogram-like path. Said rails 33 are driven by shafts 34 via crank arms (not shown). The rails are adjustable by means of an adjusting device 35 at one end to suit different lengths of the yarn tubes 32. FIG. 2 showns a plurality of yarn tubes 32 with a yarn residue 36 still on them. This residue may of course be of different size in every particular case.
The step-by-step transport means 30 will be charged with yarn tubes 32 by an operator or any feeding device. At the beginning of each operating cycle cutter carriage 3 is in its waiting which is even further to the right than the position of the cutter carriage 3 shown within its waiting zone in dot-and-dash line representation at the right-hand portion of FIG. 1. As soon as a yarn tube 13 is received intermediatly of bearing means 9 and 10 the motor 6 is caused to start and therby move the cutter carriage 3 to the left. Roller 26 is raised to the top runway surface of cam rail 28 by the switch tongue 29 so as to render driving dog 25 inactive by raising it out of contact with the cross sectional area of yarn tube 13. Vertical knife 18 is adjusted so that its circumference is, e.g., 0.2 to L0 mm'away from the outer surface of yarn tube 13. As a consequence, vertical knife 18 does not cut the residual package of yarn 36 all the way through. Since roller 22 moves on top of cam rail 23 the horizontal knife 20 is raised to such an extent that the sleeve of yarn tube 13 will not be damaged. As soon as horizontal knife 20 gets to within the starting area of the yarn tube 13, i.e., the portion thereof which contains yarn residue 36, roller 22 is caused to move along the descending bevelled portion of cam rail 23 to bring horizontal knife 20 into contact with the circumference of the sleevevof yarn tube 13 to thereby cut the leftover yarn residue 36. As cutter carriage 3 has moved past the length of yarn tube l3,
the roller 22 travels up the ascending bevel of cam rail 24 so that horizontal knife 20 is again raised and damage to the end of yarn tube 13 is avoided. At the end of the cutting pass of cutter carriage 3, roller 26 clears the end of cam rail 28 (the partial dot-and-dash line representation of carriage 3 at the left-hand portion of FIG. 1 shows roller 26 about to clear the end of cam rail 28) so that driving dog 25 drops down and its end portion protrudes into the cross-sectional area of yarn tube 13. Abutment wall 12 of bearing means 10 is provided with a recess 37 for driving dog 25 to pass therethrough. Driving dog 7 is displaced within range of sliding rail 8 during its movement around the sprocket 5 and on its way back drags cutter carriage 3 along with it. This brings driving dog 25 into engagement with yarn tube 13 thereby pushing the latter through the passage opening 14 and also through the stripper tube 15 and out of the machine. The marginal edge portions of passage opening 14 and the end face edges of stripper tube 15 coact to strip off any adhering yarn residues. This stripping action is assisted by a shorttime air jet applied via blower nozzle 17 and other nozzles, if any, as mentioned. The yarn residues are passed into a collecting vessel (not shown) or onto a conveyor system while yarn tube 13 as such is ejected out of stripper tube 15 towards the right as viewed in FIG. 1. As a function of the return pass of the cutter carriage 3, the step-by-step transport means 30 is started to advance yarn tubes 32 by one step, thereby introducing the next yarn tube into position supported on bearing means 9 and 10, ready for the next cutting pass of cutter carriage 3. On reaching its end position the cutter carriage 3 trips a limit switch 38 which is provided to synchronize the various cycle steps.
While the invention has been described in detail with reference to specific embodiments, it will be appreciated that departures therefrom can be made which are within the scope and spirit of the invention. All such are intended to be included in the following claims.
What is claimed is:
1. A machine suitable for cutting yarn residue off yarn tubes comprises bearing means to support a yarn tube, a cutter carriage havinga cutting knife thereon and arranged to be moved relative to the yarn tube in a cutting pass, so as to cut residual yarn from the yarn tube by means of said cutting knife, and in a return pass, a driving dog and means to hold the driving dog clear of the yarn tube during the cutting pass of the cutter carriage and to engage the driving dog with the yarn tube on the return pass of the cutter carriage so as to eject the yarn tube from the bearing means.
2. The machine of claim 1 wherein said driving dog is carried by said cutter carriage.
3. The machine of claim 2 wherein said means to hold the driving dog clear of the yarn tube during the cutting pass and to engage the driving dog with the yarn tube on the return pass comprises means connecting said driving dog to a roller which coacts with a cam rail positioned to engage said roller along its path of travel with said cutting knife.
4. The machine of claim 1 further including a stripping tube disposed in axial alignment with the path of travel of the driving dog so that the yarn tube is ejected through said stripping tube.
5. The machine of claim 4 wherein the inner diameter of the stripping tube is approximately equal to the outerdiameter of the. yarn tube.
6. The machine of claim 5 wherein said cutter carriage carries a cutting knife which is shiftable to clear the extremities of the yarn tube and to be shifted closer to the yarn tube as it transverses the portion thereof containing the residual yarn.
7. The machine of claim 6 wherein shifting of said cutter knife is provided by mounting said cutter knife on an adjustable arm which arm carries a roller which coacts with cam rails positioned to engage said roller along its path of travel with said cutter carriage.
8. The machine of claim 7 wherein said cutter carries a horizontal cutter knife and a vertical cutter knife and said horizontal cutter knife is mounted on said adjustable arm.
9. The machine of claim 1 wherein said bearing means is provided with an axial passage opening to permit passage of a yarn tube therethrough.
10. The machine of claim 1 further including a blower nozzle to direct a jet of air against the yarn tubes prior to ejection there of from the machine.
11. The machine of claim 10 further including an axial passage opening in said bearing means to permit passage of a yarn tube therethrough and wherein said nozzle is disposed adjacent the axial passage opening.
12. A yarn cutting off machine suitable for use with yarn tubes comprises bearing means to receive the extremeties of a yarn tube, and guide rods extending parallel to the yarn support axis of said bearing means for shifting a cutter carriage in a cutting pass and in a return pass on said guide rods, said cutter carriage carrying a cutting knife in a plane including said axis of the bearing means, the bearing means being provided with an axial passage opening, the cutter carriage carrying a shiftable driving dog connected to a roller which coacts with a cam rail to hold said driving dog in an inactive position relative to the yarn tube while the cutter carriage moves in said cutting pass and for engaging said driving dog with said yarn tube while the cutter carriage moves in said return pass to eject said yarn tube through said axial passage opening.
13. The machine of claim '12 wherein the bearing means comprise open top trough-shaped bearing means.
14. The machine of claim 12 wherein the axial passage opening in the bearing means is aligned with the longitudinal axis of a stripping tube.
15. The machine of claim 12 wherein at the cam rail end adjacent to the end of the return pass of the cutter carriage a second cam rail is provided which protrudes into the path of movement of the roller associated with said driving dog, and a switch tongue connects said cam rail with said second cam rail.
16. The machine of claim 12 wherein a stripping tube is disposed in alignment with the axial passage opening of the bearing means and the inside diameter of the stripping tube is approximately equal to the outside diameter of the yarn tube.
17. The machine of claim 12 wherein a longitudinal slot is provided in the stripping tube to allow clearance for said knife.
18. The machine of claim 12 wherein said cutter carriage carries a vertical cutting knife and a horizontal re-cutting knife.
19. The machine of claim 18 wherein said horizontal re-cutting knife is carried by a resiliently mounted arm fitted with a roller which coacts with cam rails positioned to engage the roller along the path of travel thereof, said cam rails being bevelled in a direction facing the ends of the yarn tube held in the bearing means.
20. The machine of claim 12 further including an air nozzle directed against the axial passage opening of the bearing means.
21. The machine of claim 12 further including incremental transport means to advance a series of yarn tubes and place a fresh yarn tube into the bearing means after ejection of the prior yarn tube.
22. The machine of claim 12 further including incremental transport means synchronized with shifting of the cutter carriage on the guide rails so that said transport means places a fresh yarn tube onto said bearing means after clearance of an ejected yarn tube therelntunt N0 9 lecembe ui b.JQ'LL- hwcnwdrh) Gunter Maiwo'rm It. in cl-rLil'h-d Hm! vrrnr :lppvins; in Llu- HIIUVPitIL'HLifiltl pzlLunL and LhuL .uu'd LILLHI'I; l'uLx-ut an: lnwzrvhy Qurn-uLud .115; shown lwluw:
In claim 1, line 3, after tube, delete and insert In claim 1, line 7, after pass, delete and insert In claim 6, line 4, delete "transverses" and insert -traverses- Signed and Scaled this mirth Day Of April I 976 lsmu Arum.-
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