BOBBIN MAGAZINE FOR TRAVELLING SERVICE DEVICE ON A YARN PROCESSING MACHINE

Abstract: A bobbin magazine (70) for mounting on an end plate (48) of a travelling service tender comprises a band movable on an endless path, compartments (84) on the band to receive sticks of telescoped bobbins (86) and a transfer device to transfer sticks from the magazine to the tender. The magazine can be hinged to the tender so that the magazine can be swung out to expose the end plate.

Description: The present application relates to bobbin magazines for use with a travelling service device for servicing ope­ rating stations of a yarn processing machine. The inven­ tion is intended particularly, but not exclusively, for use in travelling doffers for open-end spinning machines, for example rotor spinning machines. Travelling doffers for use on rotor spinning machines are now very well known, being offered virtually as standard equipment on the rotor spinning machines exhi­ bited at the International Textile Machinery Exhibition held in Milan, Italy in October 1983. It is therefore be­ lieved unnecessary to provide here a detailed description of such doffers. Broadly, their function is to patrol back and forth past the individual spinning stations of the rotor spinning machine and, when a yarn package of predetermined size has been produced at one particular station, to stop in front of that station, transfer the completed package from the package holder of the station to a suitable package transporting means, (for example a conveyer belt extending longitudinally of the central portion of the machine) and to insert a fresh bobbin tube into the package holder of the station so that yarn newly spun at that station can be wound up on the fresh bobbin tube. Various systems have been proposed for providing a fresh bobbin tube in readiness for a doffing operation. The present invention relates to systems in which the tra­ velling doffing device carries its own bobbin magazine so that during its patrolling movements the doffing de­ vice carries a stock of bobbin tubes the maximum size of which is limited by the capacity of the magazine. It is normally relatively easy to provide a bobbin maga­ zine for a rotor spinning machine which is producing cy­ lindrical packages or "cheeses". These are produced on cylindrical bobbin tubes which can be made to roll in a substantially predetermined fashion in and from the ma­ gazine. Furthermore, such bobbin tubes can be made sub­ stantially symmetrical about their mid-length so that there is no left-hand/right-hand problem during transfer of a bobbin tube to a spinning station. Accordingly, there is generally no need to provide complicated feed equipment in association with magazines for cylindrical bobbins, and the available space on the doffer can be used efficiently for bobbin storage. However, problems arise when the rotor spinning machine is producing frusto-conical ("conical") packages which are produced on correspondingly conical bobbin tubes. Such tubes do not roll in a readily controllable manner, and they must be inserted into the spinning station with a specific longitudinal orientation. A bobbin magazine for conical bobbins is therefore generally more complex than a magazine for cylindrical bobbins, and a given amount of storage space can generally be used less effi­ ciently for conical bobbins than for cylindrical bobbins. This can be of a special importance where a travelling doffer is designed to be adaptable for use selectively with cylindrical or conical packages. When the rotor spinning machine is in normal operation, doffing operations will be called for at some statisti­ cally calculable average frequency so that the capacity of the doffer magazine is sufficient for a corresponding period of operating time. However, the doffer may also be designed for multi-purpose operation, and in particu­ lar for automatic start-up of the machine. In such cir­ cumstances at the beginning of the start-up operation all of the package holders in the spinning machine may be empty and the doffer may be required to insert a bobbin tube into the package holder of each spinning station in succession as part of its start-up sequence at that station. The frequency of demand for fresh bobbin tubes will be much higher during the start-up operation than during normal running, and the capacity of the magazine which is adequate for normal running may produce a very long start-up operation for the ma­ chine as a whole due to the need for frequent topping of the bobbin magazine. Proposals have therefore already been made to use sticks of telescoped conical bobbin tubes to improve efficiency of space utilization in bobbin magazines. U.S. Patent Specification 406 6218 proposes a system in which a bobbin magazine on the doffer consists of a single stick of telescoped tubes, and an automatic loading device provided at one end of the machine comprises an elevator adapted to receive a plurality of sticks of tubes and to transfer them one by one to the doffer magazine as and when called for. The axes of the bobbin tubes are aligned along the length of the machine in both the doffer magazine and the loa­ ding station elevator. German Published Patent Application No. 2131 957 des­ cribes a doffer magazine in which a plurality of sticks of telescoped bobbin tubes can be mounted in respective compartments of a carousel-like device rotatable about an axis parallel to the axes of the bobbin tubes in the sticks. The device can be rotated to bring the sticks successively into alignment with a separating station at which individual tubes can be separated from the stick currently aligned with the separating station. The mounting of this magazine in the doffer is not shown, but the sticks of tubes are disposed vertically in the magazine, and accordingly the individual tubes would normally have to be re-oriented after leaving the maga­ zine before insertion in a spinning station in which bobbin axes are normally disposed horizontally. Accordingly, neither of the above specifications shows a simple system making efficient use of available sto­ rage space. Present Invention A travelling service device for servicing operating stations of a yarn processing machine can include a support frame adapted for travel in a predetermined direction. The device may comprise means defining a plurality of compartments, and each compartment may be adapted to receive a stick of telescoped conical bobbin tubes. Each compartment may be so disposed that in use the longitudinal axes of the tubes of a stick contained therein extend substantially horizontally and transverse to said travel direction. Alternatively each compartment may be so disposed that in use the longitudinal axes of the tubes of a stick contained therein extend substan­ tially horizontally in said travel direction. Means may be provided for moving said compartments around a closed path, movement of the compartments along said path being in directions transverse to the longitudinal axes of sticks contained in the compartments. The path is preferably elongated and extends substantially verti­ cally in use. The means defining the compartments and the means for moving them around a closed path may be formed as a unit which can be assembled with the device. Selectively operable means may be provided to remove a stick of bobbin tubes from a compartment at a predeter­ mined location on said path. Selectively operable means may also be provided to separate individual bobbin tubes from a stick of tubes after removal of the stick from its respective compartment. The thus separated tubes can then be individually transferred to respective operating stations of the yarn processing machine. Means can be provided to rotate a stick of telescoped tubes after removal thereof from its respective compart­ ment so as to align the longitudinal axes of the tubes of the stick with said travel direction if they are not already so aligned. In the preferred embodiment, the means for moving the compartments comprises an elevator structure, and the closed path extends generally upwardly in use transverse to both the travel direction and the longitudinal axes of bobbin tubes stored in the compartments. Said prede­ termined location is then preferably adjacent the upper end of the path. A loading position for loading sticks of tubes into respective compartments can be provided adjacent the lower end of the path if necessary. The separating means for separating individual bobbin tubes from a stick thereof can be provided in alignment with said predetermined location or below the rotating means for aligning the tube axes with the travel direc­ tion. In the latter case, a chute may be provided to guide an aligned stick of tubes from the rotating means to the separating means. Suitable feed means can be provided to move a separated bobbin from the the separator means to a transfer unit for transferring it to an operating station of the pro­ cessing machine. Where the sticks of tubes are arranged transverse to the direction of travel when carried in their respec­ tive compartments, the removing means for removing a stick of tubes from a compartment preferably comprises an element movable between a first position, in which it lies outside said closed path, and a second position in which it projects into said path. The compartment defining means can then be formed so that they can pass along the path even when said element is in its second position, but such that sticks of tubes supported within a compartment cannot pass by said element when the latter is in its second position. For example, the compartment defining means and said element may comprise intercala­ ting portions. When in its first position, the element may act as a retainer retaining a stick of tubes in its respective compartment as the latter moves past the ele­ ment. A control system may be provided which is sensitive to interference of the element with a stick of tubes during movement of the element from its first to its second po­ sition and a control system may be operable to withdraw the element to its first position when such interference is sensed. Where the sticks of tubes are arranged in said direction of travel when carried in their respective compartments, the removing means may comprise a reciprocable element adapted to move a stick of tubes longitudinally of its own axis from its compartment. According to a further feature of the invention, a tra­ velling service device for servicing operating stations of a yarn processing machine and having a support frame adapted to travel in a predetermined direction may have an end face transverse to said direction and a bobbin magazine mounted on said end face on the frame. Hinge means may be provided connecting the magazine to the frame to enable the magazine to swing relative to the frame between a first position in which said end faces are adjacent so that at least part of the end face on the frame is concealed by the magazine, and a second po­ sition in which the end face on the frame, or at least the part thereof previously concealed by the magazine, is exposed. The invention is intended particularly, but not exclu­ sively, for use in a travelling service device which is suspended from a rail mounted above the yarn processing machine in use so that the service device is disposed at least partially outside the contours of the processing machine as viewed in plan. By way of example, two embodiments of the invention will now be described with reference to the accompanying dia­ grammatic drawings, in which- Fig. 1 shows a plan view of a rotor spinning machine with a travelling service device and a suspen­ sion system therefor, Fig. 2 shows a side elevation of the service device of Fig. 1 as viewed from the machine, Fig. 3 shows a plan view of the service device of Fig. 2, drawn to a different scale and showing more detail than the plan view in Fig. 1, Fig. 4 shows an elevation of one end face of the ser­ vice device shown in Fig. 2, Fig. 5A shows a side elevation of a first bobbin maga­ zine in accordance with the invention for attachment to the end face shown in Fig. 4, and Fig. 5B shows a plan view of the magazine. Fig. 6A and 6B are diagrammatic representations of a complete system for transferring bobbins from the maga­ zine shown in Fig. 5 into the service device shown in Figs. 2 - 4, Fig. 7 is a further illustration of the upper portion of the bobbin magazine shown in Fig. 5 and illustrating in greater detail the means en­ abling extraction of bobbin tubes from the magazine, Fig. 8 shows a detail of Fig. 7, drawn to a different scale, Fig. 9 shows further detail of the apparatus in the service device which receives bobbins from the magazine and prepares them for transfer to in­ dividual operating stations. Fig. 10 shows a diagrammatic end elevation of a second bobbin magazine in accordance with the in­ vention, and Figs. 11 and 12 show respective details of the embodiment illustrated in Fig. 10. General Background The rotor spinning machine diagrammatically illustrated in Fig. 1 comprises end heads 10 and 12 respectively with two rows of spinning units 14 extending along opposite sides of the machine between the end heads. This general machine layout, and the construction of the individual spinning units is now very well known in the yarn spinning art, and will not be described further herein. Further details of one machine construction based on this layout can be seen from United States Patent Specification 3375 649, but the present invention is by no means limi­ ted to use with that particular machine construction. Yarn newly spun at each spinning station 14 is wound up into a respective yarn package at that station. When the package has reached a predetermined size, for example a predetermined length of yarn has been wound into the package, the package is transferred from the spinning station to a conveyer belt 16 extending longitudinally of the machine between the rows of spinning stations. The package is then carried by the belt to one machine end where it can be collected and passed on in accordance with the package handling system chosen by the operating spinning mill. Transfer of the package from the spinning station to belt 16 is effected by an automatic doffer which forms one unit of a multi-purpose service device indicated at 18 in Fig. 1. Device 18 is suspended from a U-shaped rail 20 and can move in any desired direction along the rail 20 past the spinning stations 14. If all spinning stations are ope­ rating normally, device 18 performs "patrolling" move­ ments from one rail end to the other past both machine sides. Device 18 is, however, continually inspecting stations 14, and when it senses that an "event" has occurred at one of these stations, it stops in front of that station and performs an appropriate service opera­ tion on the "calling" station. Doffing of a completed yarn package is one such operation. "Piecing" of a bro­ ken yarn may be another such operation. The service de­ vice may also be designed to perform "preventive main­ tenance" involving a temporary interruptions of spinning in order to clean the rotor at the spinning station in­ volved. In addition to its automatic doffing unit, therefore, device 18 comprises a plurality of other automatically operating units, for example a yarn piecing unit, a rotor cleaning unit and a locating system designed to control positioning of device 18 relative to the spinning ma­ chine. Several such multi-purpose devices are now commer­ cially available. Details of one such device, available from the assignee of the present application, have been described and illustrated in the following prior United States Patent Applications- a) Piecing aspects - U.S. Serial No. 611 602 filed May 18, 1984 corresponding with European Published Patent Appli­ cation No. 127 017 published December 5, 1984. b) doffing aspects - U.S. Patent Application Serial No. 611852 of May 18, 1984 corresponding with Euro­ pean Published Patent Application No. 126 352 pub­ lished November 28, 1984, and c) locating aspects United States Patent Application Serial No. 612 068 filed May 18, 1984 corresponding with European Published Patent Application No. 126 373 published November 28, 1984. The contents of those prior patent applications are in­ corporated by reference in the present application. How­ ever, the present invention is not limited to use with devices as described in those applications. Service Device Structure Figs. 2 and 3 show in grossly simplified form the struc­ ture of the service device 18. For simplicity at this stage of the description the device has been illustrated and will be described for use with the machine winding cylindrical packages or "cheeses". Modification of the bobbin magazine to enable use with the machine winding "cones" will then be described with reference to sub­ sequent figures. The structure shown in Figs. 2 and 3 is illustrated pri­ marily in order to show the importance of space utili­ zation in a multi-purpose device of this type. Accor­ dingly, it is believed unnecessary to describe details of the illustrated devices, and attention will be con­ centrated upon the overall layout of the various auto­ matic units in the service device. Details of some of the automatic units can however be obtained from the prior patent applications referred to above. The main structural member in device 18 is a carrier beam 22 which is mounted on the rail 20 by a suspension and a drive unit 24, 26 respectively, and from which all other parts of the service device are suspended. Two further major structural elements are provided by verti­ cal bulk heads 28, 30 respectively which (as viewed in Fig. 2) divide device 18 into left-hand, right-hand and center sections. The main automatic operating units are provided in the center section. These units can be con­ sidered under five groups arranged vertically one above the other; the lowermost ("first") group 32 comprises units adapted to cooperate directly with the spinning components at a spinning station being serviced; the se­ cond group 34 comprises units adapted to handle a yarn during threading thereof into the machine for a piecing operation; the third group 36 comprises units adapted to present a yarn to the second group 34 (for example, group 36 comprises a suction nozzle 38 for finding a broken yarn end on a package at a spinning station being serviced); the fourth group 40 comprises units used during doffing and during insertion of a fresh bobbin tube into a spinning station to replace a package doffed therefrom; the fifth, and uppermost, group 42 comprises a system for feeding bobbin tubes to group 40. The left-hand section of device 18 contains drive and control systems for the various units in the center sec­ tion. The right-hand section contains primarily a suction system comprising a fan 44 and a reservoir 46 which is held under low pressure by fan 44 and provides correspon­ ding low pressure to various pneumatic systems in the center section of the device. The main bulk of device 18 is contained within a gene­ rally box-like envelope of rectangular vertical cross section represented by two end plates 48, 50 respective­ ly, the end plate 48 being shown also in Fig. 4. The bars 52 secured to these end plates are safety devices inten­ ded to stop travel of device 18 if one of the bars con­ tacts an obstruction. As best seen in Fig. 3, the out­ wardly-facing side (that is, the side facing away from the machine) has protective panelling 54, but device 18 is open on its side facing the machine. At its lower edge on that side, device 18 has rollers 56 to engage guide rails provided on the machine itself. As best seen in Fig. 3, device 18 is fitted at its upper end with some parts which project inwardly over the ma­ chine. These parts include an energy pick-up 58 by means of which energy can be derived from the machine to ope­ rate device 18. Of more direct interest in this case is the bobbin magazine 60 the floor of which is in the form of a simple inclined plane sloping from the center of the machine to a vertically disposed chute 62. Cylindri­ cal bobbin tubes can roll down the inclined plane and drop vertically down the chute to be held by a pair of legs 64 (Fig. 2) at the lower end of the chute. From this position they can be collected by a bobbin inser­ ting device 66 which transfers the bobbins individually from legs 64 to spinning stations of the machine. This arrangement is described in U.S. Patent Application Serial No. 611852 referred to above and further details can be obtained from that application. The simple bobbin feed arrangement shown in Figs. 2 and 3 cannot be used for conical bobbins because they will not roll in a controllable fashion in the simple maga­ zine 60. The drum-type magazine described in U.S. Appli­ cation Serial No. 611852 is satisfactory for normal ope­ ration of the machine where doffing operations are re­ quired relatively infrequently. However, during a start-­ up operation as described above, there is a relatively heavy demand for insertion of bobbin tubes into the empty spinning stations in order to bring them into service. The drum-type magazine is unable to satisfy this demand without frequent topping up which reduces the efficiency of overall operation. An alternative magazine for conical bobbins which will now be described with reference to figures 4 - 9, enables this problem to be overcome. The new magazine is to be attached to one end of the ser­ vice device. In the illustrated embodiment, this is effected by securing the magazine to the end plate 48. The new magazine should remain as far as possible with­ in the cross-sectional envelope defined by end plate 48, but in order to maximize the available storage space it is desirable to utilize the whole of the cross section represented by that end plate. This gives rise to a prob­ lem, however, in that (as seen in Fig. 4) plate 48 has a plurality of openings 68 enabling limited access to the drive systems in the left-hand section of the device 18 as viewed in Fig. 2. These openings enable insertion of operating tools by means of which the drives can be operated manually in the event of a fault, during testing or for other reasons. In order to overcome this problem, the bobbin magazine is to be secured to plate 48 in a manner enabling it to move relative to the plate, while remaining secured thereto. The magazine can be moved bet­ ween an operating position, in which it conceals plate 48, and a non-operating position in which plate 48 is exposed. Bobbin Magazine The general structure of the new magazine is shown in Fig. 5, Fig. 5A representing a vertical section as viewed from one side, and Fig. 5B representing a plan view. As there shown, the new magazine 70 is a generally box-like struc­ ture the dimensions of which in end elevation (not shown) correspond closely (but not necessarily exactly) with those of the plate 48. Magazine 70 is secured to plate 48 (after removal of the safety bar 52 therefrom) by means of a hinge 72 provided on the full length of the outer edge of plate 48, that is the edge furthest from the ma­ chine. A suitable releasable catch mechanism 74 (Fig. 5B, details not illustrated) is provided to secure magazine 70 in its operating position relative to the device 18 in which one end face 88 of the magazine lies in a plane parallel to and adjacent plate 48. When the magazine is in this position, it can be operated (by means to be des­ cribed below) to transfer bobbins from the magazine to the main part of the device 18. When it is desired to ob­ tain access to plate 48, however, catch 74 can be relea­ sed and magazine 70 can be swung about a vertical axis passing through the hinge 72 to a position in which plate 88 lies at right angles to plate 48 as viewed in Fig. 5B. The main operating element of magazine 70 is best seen in Fig. 5A and comprises an endless belt 76 running around upper and lower drive and guide pulleys 78, 80 respectively. Each pulley 78, 80 is mounted (by means not shown) to be rotatable about a generally horizontal axis in an anti-clockwise direction as viewed in Fig. 5A. Thus, as viewed in that Figure, the right-hand vertical run of belt 76 is travelling upwardly and the left-hand vertical run is travelling downwardly. A plurality of compartment-defining elements 82 is se­ cured to band 76 so that the elements 82 are evenly spaced along the band. Each element 82 is Y-shaped in cross-section, the main leg of the Y being elongated and attached to the band at its foot. A compartment 84 is defined between each successive pair of elements 82. Each compartment 84 is elongated with the longitudinal axis of the compartment lying parallel to the width of the band 84, that is substantially horizontally. The length of each compartment is sufficient to hold a "stick" of telescoped, conical bobbin tubes with a pre­ determined number of tubes in the stick, for example eight tubes as shown in Fig. 5B. The axial cross-section of each compartment 84 is dimensioned to leave adequate clearance around bobbin tubes 86 (Fig. 5A) of predeter­ mined maximum external diameter. The heads on the Y-­ shaped elements 82 serve to retain the sticks of tubes in their respective compartments 84 after they have been loaded into the magazine and to prevent rubbing against the vertical casing walls 88, 89 of the maga­ zine. However, as a compartment 84 passes from the downwardly travelling run to the upwardly travelling run of the belt 76, a stick of tubes in that compartment is permitted to roll on a curved guide plate 90 (Fig. 5A) which forms the lowermost surface of the magazine. A hatch 91 in plate 90 can be released to permit un­ loading of the magazine by hand if required. The magazine is illustrated in Fig. 5 in a condition in which it is being loaded from the fully-empty state. It will be assumed that loading of the magazine is effected manually, although there is nothing to prevent automation of this loading step. For the loading operation, a door 92 (Fig. 5B) is opened at hinge 93 on the side of the magazine facing away from the machine. This provides access to the compartments 84 so that it is easy to in­ sert a stick of tubes by axial movement thereof. The drive (not shown) can drive belt 76 in the anti-clockwise direction, or the system can be driven manually, so as to enable insertion of sticks of tubes into respective compartments 84 near the lower end of the elevator. The endless belt 76 defines a closed path of movement for the compartments 84, and in Fig. 5A it is assumed that the first-inserted stick of bobbins has passed along this path to a stage at which it is ready to pass from the upward to the downward run of belt 76. As can also be seen from Fig. 5A the compartment 84 at the upper end of the downward run of belt 76 is thereby slightly enlarged, so that this is a suitable position on the path to effect removal of sticks of tubes from the magazine. A removal means operating at this point on the path will be described later. In the assumed circum­ stances, however, in which the magazine is being loaded, the removing system is rendered inoperable and effective­ ly closes off the casing of the magazine as illustrated in Fig. 5A. Thus the loading operation can continue, with passage of the already loaded sticks of tubes from the upward to the downward run of belt 76, and the service device 18 can finally be sent into service operation with a stick of tubes in each compartment of its maga­ zine 70. The general advantages of this arrangement can be seen from Fig. 5. The total length of the device 18 in its direction of travel is increased (by addition of the magazine 70) by little more than twice the maximum bobbin external diameter plus the diameter of the pulleys 78, 80. However, virtually the full cross-sectional area of the device 18 is exploited by each of the two runs of belt 76. In particular, the full width of the belt 76, and hence almost the full width of the device 18, can be exploited for storage purposes. There is an associated problem, in that the bobbin tubes are now oriented at right angles to the length of the machine, whereas each tube must be aligned longitudinally of the machine at the time it is inserted into its re­ spective spinning station. A system for enabling this will now be described in broad outline with reference to Fig. 6. If the weight of the magazine fully loaded is too much for the suspension of the device 18 to bear, then the magazine can be provided with its own separate suspension for cooperation with rail 20, and a tow connection can be provided between device 18 and separately suspended magazine 70. Conical Bobbin Feed Fig. 6A illustrates once again in highly diagrammatic form the upper portion of magazine 70; in this case, no attempt has been made to represent the actual physical structure involved since only the operating principle is of interest in Fig. 6. An embodiment enabling the prin­ ciples of Fig. 6 to be put into effect will be described later with reference to Figs. 7 to 9. Similar remarks apply to other elements shown in Fig. 6B which are pro­ vided on the service device 18. As indicated in Fig. 6A a pivotable door 92 is provided in the upper portion of casing wall 88 facing end plate 48. When door 92 is pivoted to a closed position (dotted lines Fig. 6A) it closes the casing of magazine 70 so that no bobbins are extracted, for example during loading as described with reference to Fig. 5A. When, however, door 92 is pivoted to project into magazine 70 (full lines in Fig. 6A) the stick of tubes in the compartment 84 at the upper run of belt 76 can roll out of the com­ partment and down inclined door 92 into service device 18. In this respect it is to be noted that although an individual conical bobbin tube will not roll in a readily controllable manner, a telescoped stick of such tubes will roll controllably at least over a short distance which is sufficient for the present system. When the newly extracted stick 94 (Fig. 6A) reaches the lower end of door 92, it falls therefrom into an open-­ topped oblong box 96 which is seen in elevation in Fig. 6A and has been illustrated again in plan in Fig. 6B. Box 96 is mounted on a carrier 98 which is pivotable about a vertical axis defined by a pivot pin 100. Carrier 98 can be pivoted through a quarter-circle, so that box 96 adopts the dotted line position shown in Fig. 6B. The complete stick 94 is therefore now oriented longitudi­ nally of the machine (and of the direction of travel of the device 18). While maintaining this new orientation, the stick 94 is now transferred to a bobbin tube separating device ge­ nerally indicated at 102. The means enabling this trans­ fer will be described later with reference to Fig. 9. The tube separating device 102 is of a generally known type, similar to that described in US Patent 4066218. Accordingly, only the broad principles will be described in this specification. In Fig. 6B device 102 is shown in a condition of readi­ ness to separate the "first" or "leading" tube 86L of the stick 94. In this condition, the second tube of the stick is clamped adjacent its maximum diameter end ("foot") by a pair of clamping elements 104. A separator finger 106 engages the axial end face on the foot of the leading tube 86L. Finger 106 is pivoted at 108, and when the finger is pivoted in a clockwise direction (as viewed in Fig. 6) around its pivot 108 it urges tube 86L to the left and away from the clamped tube and the re­ mainder of stick 94. Finger 106 has only a short stroke of movement, sufficient to ensure that the leading tube 86L is freed from the remainder of the stick. Movement of the freed tube to the upper end of the chute 62 (see also Figs. 2 and 3) is effected by a pusher 110 which also engages the axial end face at the foot of the lea­ ding tube but which has a relatively long operating stroke compared with finger 106. When it reaches chute 62, tube 86L falls into the chute onto a releasable control plate (not shown). When the plate is moved to unblock the chute, the tube can fall into the holder legs 64 (see also Fig. 2) ready for collection by the inserting element 66 (Fig. 2). Details of the chute are available in US Patent Application Se­ rial No. 611852 referred to above, and form no part of the present invention, so that further description will be confined to the system as far as the pusher 110. When pusher 110 has been operated to move the first tube away from stick 94, the clamping elements 104 are re­ tracted so as to free the stick 94 for movement towards the left as viewed in Fig. 6. At the same time, a pi­ votally-mounted end stop 114 rises (as viewed in Fig. 6B) into alignment with the stick 94; end stop 114 is connected by a suitable linkage to the clamping system, so that the stop is moved to its operative position auto­ matically as the clamps are retracted and is withdrawn from its operative position automatically as the clamps are engaged. The stick 94 is continuously urged to the left as viewed in Fig. 6B by a spring-biased forwarding member 116 which engages the foot of the trailing bobbin 86T. Accordingly, the stick moves to the left until the previously clamped tube engages end stop 114, when it is located in the position previously occupied by the lea­ ding tube 86L. The system is therefore now ready for a repeat operation. It is believed that the operating devices for effecting the operations described with reference to Fig. 6 will be readily apparent from that figure, and they will therefore be referred to only very briefly. Door 92 is operated by a piston and cylinder unit 118 which is spring-biased to urge the door into the closed condition in which the bobbins cannot be extracted from magazine 70. Box 96 is moved by a piston and cylinder unit 120 which is spring-biased to urge the box into the position to receive a stick of tubes falling from the door 92. Clamping elements 104 are operated by a double-acting piston and cylinder unit 122, and the pivotable end stop 114 is operated by the same unit because of the linkage described above. Finger 106 and pusher 110 are operated by respective, individual, double-acting piston and cy­ linder units 124, 126 respectively, unit 126 having a substantially longer operating stroke than unit 124. The spring-bias urging forwarding member 116 to the left as viewed in Fig. 6 is indicated at 128 and the forwarding member can be withdrawn to a "full-right" position against the bias of spring 128 by means of a single-ac­ ting piston and cylinder unit 130. Control of pressurization of unit 118 is effected by valve V1. Control of pressurization of unit 120 is effec­ ted by valve V2. Control of pressurization of unit 130 is effected by valve V3. Control of pressurization of the double-acting units 122, 124 and 126 is effected by valves V4, V5 and V6. Fig. 7 corresponds closely with Fig. 5A and most elements will not need detailed description. The main point to be noted is that pivotable door 92 has a head portion pro­ viding a closure face 132 and an extractor face 134. When door 92 is pivoted fully anti-clockwise as viewed in Fig. 7, face 132 forms a continuation of casing wall 88 so that sticks of tubes are retained in the magazine 70. When door 92 is pivoted fully-clockwise (full line position in Fig. 7), face 134 provides an inclined plane projecting into the uppermost compartment 84 on the down­ ward run of belt 76 to enable extraction of a stick of as already described with reference to Fig. 6. It is desirable to enable elements 82 to pass by door 92 even when the latter is in its extraction position. For this purpose, the free ends of elements 82 are provided with recesses 136 (Fig. 8) so that the head of each ele­ ment 82 is not continuous across the full width of belt 76 but is formed on a plurality of projecting fingers 138. As seen in Fig. 8, the left hand finger 138 is shor­ ter to allow for the conicity of the foremost tube in the stick. The head portion on door 92 is made correspon­ dingly discontinuous so that the fingers on the door 92 correspond to the recesses 136 in the elements 82. The clearances are made such that elements 82 can pass by door 92 without interference. However, a stick of tubes carried by an element 82 passing from the upward to the downward run of belt 76 will extend longitudinally across the fingers of the door 92 and will be collected thereby as the corresponding compartment 84 reaches the downward run of the belt. It is preferred to re-close door 92 at the completion of each extraction operation. The belt 76 can then be driven at any time that the door 92 is closed, for example for inspection or loading operations. In order to avoid com­ plication, no particular steps are taken to ensure that belt 76 stops in any particular disposition relative to door 92. Accordingly, when an attempt is made to open the door 92, there may be a stick of tubes resting on the uppermost element 82 on the downward run of belt 76 and this stick will interfere with opening of the door. Means can be provided to sense such interference and to cause the belt to move forward sufficiently to permit opening of the door. Stick Alignment System Fig. 9 shows the carrier beam 22 and a horizontal plate 140 supported (by means not shown) slightly above beam 22 when device 18 is suspended from rail 20 in use. Plate 140 carries a boss 142 rotatably supporting the pivot pin 100 previously described with reference to Fig. 6. Carrier 98 (see also Fig. 6) is mounted on pin 100 so that the box 96 (see also Fig. 6) is spaced slightly from plate 140 for movement relative to the plate without in­ terference. The position illustrated in Fig. 9 corresponds to the dotted line position in Fig. 6, that is with the length of the oblong box 96 aligned with the direction of travel of device 18. As already described with reference to Fig. 6, box 96 is open-topped so that it can receive a stick 94 falling from door 92. Box 96 also has no bottom, so that the stick 94 falls directly onto plate 140. The position of the stick relative to the plate is, however, restrained by the side-walls of box 96. As box 96 pivots from the full line position in Fig. 6 into the dotted line posi­ tion, the stick 94 is forced to slide over plate 140. However, as seen in Fig. 9, plate 140 has an opening 144 in alignment with and dimensioned to correspond with the box 96 when the latter is in the position shown in Fig. 9. The stick of tubes thus falls through opening 144 in plate 140 into a short chute 146. The stick first falls and then rolls down the wall of chute 146 until it hits a stop wall 148 approximately at the height of the carrier beam 22. In this position, the stick is at rest in the separator device 102. At this time, the forwarding member 116 is fully withdrawn (to the right as shown in Fig. 6B) to ensure that the stick of tubes can roll into the required position in the se­ parator 102 without interference from the member 116. As soon as the stick of tubes is in the desired position in contact with wall 148, piston and cylinder unit 130 is operated to move member 116 forward (to the left as viewed in Fig. 6B) so as to urge the stick of tubes for­ ward until the front tube engages the retainer 114. In this position, as shown in Fig. 6B, the pusher 110 en­ gages just behind the foot of the foremost tube. As shown in Fig. 9, the pusher 110 extends through an opening 150 forming a guideway in the wall 148. Pusher 110 has a shaped lip 152 which enables it to engage be­ hind the foot of the foremost tube without interference with the second tube (if any) in the stick. During the return movement of pusher 110, after it has delivered the foremost tube of the stick to the chute 62 (Fig. 6B), the pusher must ride over the foot of the next tube in the stick which meanwhile will have moved forward into engagement with the retainer 114. As will now be des­ cribed, means is provided to enable pusher 110 to move radially outwardly relative to the stick of tubes in order to enable it to ride over the foot of the tube. The last-mentioned means is illustrated diagrammatically in Fig. 6B, since it is believed that details of the system are not essential to this description. Thus, the cylinder of unit 126 has a pivot mounting 154 at its end remote from the pusher 110. Mounting 154 cooperates with a corresponding portion (not shown) secured in the frame of the device to enable the cylinder of unit 126 to pivot about an axis contained within mounting 154 and extending at right angles to the plane of the drawing in Fig. 6B. A compression spring 156 is provided extending between the frame and the cylinder urging it in a clockwise di­ rection (as viewed in Fig. 6B) around the pivot axis in mounting 154. A suitable stop (not shown) is provided to limit this "clockwise" rotation of the unit 126 and thus to limit the movement of lip 152 of pusher 110 towards the stick of tubes. The stop is positioned to permit pusher 110 to engage behind a tube foot as illustrated in Fig. 9. When the lip 152 engages the foot of a tube during a retraction movement, piston and cylinder unit 126 can swing anti-clockwise (as viewed in Fig. 6B) around the pivot axis in mounting 154 against the bias of compression spring 156. As soon as lip 152 has passed over the tube foot, however, spring 156 again urges the unit 126 in a clockwise direction so that pusher 110 en­ gages behind the tube foot. Correspondingly, as a new stick of tubes is pushed forward against the retainer 114 by member 116, unit 126 can pivot on mounting 154 to per­ mit pusher 110 to ride over the foot of the foremost tube. The second embodiment is illustrated in Figures 10 to 12. Elements similar to those already described are indicated by the same reference numerals. In this case each compartment 84 is formed by a C-shaped element 160 secured to the belt 76 at a location on the C diametrically opposite the opening therein. The major difference with respect to the first embodiment is to be seen in the disposition of the axes of the belt drive pulleys 78, 80 - and hence the longitudinal axes of the compartments 84. As seen in the end elevation in Fig. 10, these axes now extend at right angles to the end face 88 which is parallel to the end plate 48 (Fig. 4) of the service device - the end plate 48 cannot be seen in Fig. 10 because it is concealed behind the plate which forms the magazine end face 88. In the second embodiment, this latter plate 88 forms a support and mounting structure for the magazine, being secured at its left hand edge (as viewed in Fig. 10) to the end plate 48 by a hinge arrangement (not seen in Fig. 10) similar to the hinge 72 shown in Fig. 5A. Hook elements, the heads of which can be seen at 162 in Fig. 10, extend from the service device through openings 164 in plate 88 and secure the latter in its operating position parallel to plate 48. As before, the catches formed by the hooks can be released to permit the plate 88 to be swung away from plate 48 to expose the latter. Pulleys 78, 80 project cantilever-fashion from mounting plate 88. Plates 48 and 88 also each have an inverted L-shaped opening 166 through which sticks of tubes (not shown in Fig. 10) can be transferred from the magazine into the service device by movement longitudinally of the compart­ ment (and stick/tube) axes. This transfer is effected by a runner 168 reciprocable on a rail 170 mounted in the service device and extending parallel to the com­ partment/stick axes. Runner 168 carries an arm 172 projecting downwardly therefrom on the side facing the compartments 84. At its lower end, arm 172 carries a spring finger 174 which, as shown in Fig. 10, can project into the com­ partment 84 of a suitably located element 160. Rail 170 extends sufficiently far out from plates 48, 88 to enable runner 168 to carry the spring finger 174 past the outboard end (i.e. the end remote from plate 88) of a stick of tubes carried by the compartment 84 in the unloading position (i.e. the position in which finger 174 projects into that compartment). When the compartment first arrives in the unloading position, runner 168 is retracted so that finger 174 is contained within the service device. After the compartment has been correctly located (as will be described) runner 168 is moved outwardly along rail 170 carrying finger 174 to its outboard position, past the stick of tubes. As seen in Fig. 10, arm 172 lies wholly outside the element 160, only finger 174 projecting into the com­ partment. The finger engages the tubes in the compart­ ment 84 as it moves past them. The stick must be so oriented that the tips of the tubes (the narrow ends) lie closer to plate 88. The spring in finger 174 enables it to move outwardly over the foot of each tube in the stick until it engages behind the foot of the outboard tube in the stick. On the return movement of the runner 168 into the service device, finger 174 engages the foot of the outboard tube and draws the stick into the ser­ vice device where it is received by a channel-staped re­ ceiver element (not seen in Fig. 10). A suitable runner and rail structure 168, 170 is supplied by Festo Maschi­ nenfabrik G. Stoll, D- 73 Esslingen 1, Berkheim, W. Ger­ many, under the type number DFO-PPV-A. Figure 11 shows in section a detail of the system des­ cribed with reference to Fig. 10, namely the element 160 in the unloading position. The element is secured to belt 76 by rivets 176. A sensor device 178 is located adjacent belt 76 to respond to the heads of the rivets 176. Sensor 178 provides a signal to a microprocessor control system (not shown) which controls operation of a drive motor (not shown) rotating the pulley 78. Thus movement of belt 76 can be stopped with a compartment 84 in the unloading position accurately aligned with opening 166 and finger 174. The drive motor can be pro­ vided in the service device and a connector drive shaft (not shown) extends through plates 48, 88 to pulley 78. Secured to the interior of each C-element 160 opposite the opening therein is a reflector 18o. A photosensor device 182 having a light beam emittor and receiver is located opposite the opening so that the beam from de­ vice 182 is reflected by the reflector 180 if a com­ partment in the unloading position is empty. The drive motor referred to above can then be operated again by the microprocessor control to move the belt 76 along until a full compartment is in the unloading position, when the light beam from device 182 cannot reach the reflector 180 because of the intervening stick of tubes indicated in dotted lines at 86 in Fig. 11. As seen in Figure 11, the C-element 160 extends suffi­ ciently far around the periphery of the sticks of tubes to ensure that the stick is retained by the element as the latter passes around the lowermost part of the path defined by the belt 76. In order to reduce weight, a housing around the elevator formed by the belt and pulley system can be omitted. However, in order to en­ sure that the sticks are retained against axial move­ ment out of the outboard ends of the compartments, a retainer plate can be fitted on the outboard ends of the shafts (not shown) of the pulleys 78, 80. Such a plate could extend from top to bottom of the elevator, extending part-way across the cross-section of each compartment - for example as far as the dotted line 184 indicated in Fig. 11. Loading of sticks can be effected by distorting the belt 76 in the direction of the arrow 185 to a degree sufficient to move the section of one compartment to a position clear of the retainer plate as viewed in end elevation. This enables insertion of a stick by movement along the compartment axis. The belt 76 must of course have the necessary flexibility. Loa­ ding can be performed by hand. Fig. 12 shows in sectioned plan a further detail of the system shown in Fig. 10, namely at the region of the plates 48, 88. The runner 168 is assumed to be moving towards the outboard end of the rail (downwardly as viewed in Fig. 12) and the finger 174 is about to en­ gage the tip of the inboard tube 86 of the stick in the compartment to be unloaded. As seen in Fig. 12, finger 174 can be formed as a leaf spring secured to arm 172 at its outboard end and forming a "wedge" increasing in size in the inboard direction. The inboard end of the spring is bent to pass through a slot 186 in the arm 172. As the wedge - structure provided by the spring 174 engages the tip of tube 86, the bent end of the spring is forced through the slot 186 so that the wedge effect is reduced and the spring rides over the tube. When the spring passes beyond the foot of the outboard tube, spring 174 returns to its illustrated condition in which the inboard end of the spring will catch be­ hind the tube foot on the return stroke of the runner 168. Alternative spring devices could of course be de­ vised. Fig. 12 also shows one side wall and the floor of the receiver channel 188 provided in the service device, the other side wall being hidden beneath the rail 170. The channel extends as far as the top of the chute 62 (Fig. 3) into which the bobbin tubes can be pushed by movement along the channel after they have been se­ parated from the stick. A separating mechanism identical with that described with reference to Fig. 6 is located in a separating zone (not shown) of the channel between the chute 62 and the channel portion shown in Fig. 12. Rail 170 extends at least so far into the service de­ vice that the arm 172 can draw a stick of tubes into the separating zone. In principle arm 172 could also be used to draw separated tubes from the separating zone to the chute, but this would necessitate an additional means to operate the spring 174 to enable it to pass the stick in the separating zone to a position at which it could engage behind a separated tube. It will often be simpler to use a separate pusher 110 (Fig. 6) for this purpose. As can be seen from Fig. 12, arm 172 is bent below runner 168 and extends outboard therefrom, so that the rail 170 must extend only part-way along each compartment.

Claims: 1. A travelling service device for servicing operating stations of a yarn processing machine comprising a support frame adapted to travel in a predetermined direction, an end face transverse to said direction, a bobbin magazine and means mounting the bobbin magazine on said face for movement between a first position in which said magazine conceals at least part of said end face and a second position in which said end face, or at least the part thereof previously concealed by the magazine, is exposed. 2. The arrangement as defined in claim 1, wherein said mounting means mounts said bobbin magazine on said support for pivoting between said first and second positions. 3. The arrangement as defined in claim 1, wherein said mounting means mounts said bobbin magazine on said support for pivoting about a substantially vertical axis between said first and second positions. 4. The arrangement as defined in claim 3, wherein said end plate has two vertical edge portions one of which is closer and the other more remote from the stations; and wherein said mounting means is situated at said other edge portion. 5. The arrangement as defined in claim 1, and further comprising releasable locking means for securing said bobbin magazine in said first position thereof. 6. The arrangement as defined in claim 1, wherein said bobbin magazine includes means for bounding a plurality of compartments adapted to receive respective bobbin tubes, and means for mounting said bounding means on said support for movement in a closed path extending in a plane substantially normal to respective longitudinal axes of said compartments and of the bobbin tubes received therein, and so that said longitudinal axes extend substantially horizontally. 7. The arrangement as defined in claim 6, wherein said bounding means has two elongated runs extending transversely of said trajectory, and two connecting portions interconnecting said runs 8. The arrangement as defined in claim 7, wherein said connecting portions extend substantially parallel to said trajectory. 9. The arrangement as defined in claim 8, wherein said end wall has a width and a height; and wherein said bounding means has a width substantially equal to said width of said end wall and said runs have a length substantially equal to said height of said end wall, so that said end wall is substantially completely concealed by said bobbin magazine when the latter is in said first position thereof.

Inventors: LATTION, ANDRE, Lattion, André
Applicants: MASCHINENFABRIK RIETER AG
Application year: 1985
Main classification: B65H67
IPC codes: B65H49, B65H67, D01H9