Metering pump for supplying a thread fixing fluid

Abstract

The invention relates to a metering pump (40) for supplying a thread fixing fluid (28) for fixing a thread end (31) to a wound package (13), comprising a first piston (45) in a fluid pump housing (43) for conveying the thread fixing fluid (28) and a second piston (49) in a propellant pump housing (47) for driving the first piston, wherein the first piston (45) is mounted together with the second piston (49) by means of a common piston rod (48), and to a winding device for winding up a synthetic thread (12) using the metering pump (40).

Description

[0001] Dosing pump for supplying a thread fixing fluid

[0002] The invention relates to a dosing pump for supplying a thread fixing fluid for fixing a thread end to a bobbin package and an associated winding device for winding a synthetic thread with the dosing pump.

[0003] To produce synthetic threads, thread produced from a polymer melt is drawn off and treated and wound into a coil.

[0004] The spool serves to collect and store the thread, which is then fed into a further processing step. To ensure continuous extrusion and thread production during the melt spinning process, the thread is continuously wound into spools without major interruptions.

[0005] For this purpose, winding machines are used, which have two winding spindles projecting from a rotatably mounted bobbin turret. The winding spindles can be moved alternately into a winding position and a doffing position by rotating the bobbin turret.

[0006] In the winding position, the thread is wound onto the respective winding spindle to form the bobbin. Once the bobbin reaches a predefined final diameter, the bobbin is called a full bobbin or bobbin package. The winding spindle is moved with the full bobbin into the take-off position. In this position, the thread is wound around the circumference of the bobbin into a final winding and then caught and separated by the other winding spindle, which is moved into the winding position.

[0007] In the winding position, the thread is then wound into a new spool on the other spool spindle.

[0008] The full bobbin, held in the take-off position by the winding spindle, is removed from the winding spindle after braking until the spindle stops, and then fed to a further processing step. A loose thread end created during the final winding must remain as close to the circumference of the bobbin as possible to prevent unwanted unwinding during the removal of the full bobbin from the winding spindle and during transport.

[0009] For fixing the loose thread end on the full bobbin during bobbin change at the circumference of the full bobbin, thread fixing devices are known which can be used with a generic winding device.

[0010] For example, DE 44 13 885 A1 and WO 2022 / 023051 disclose corresponding thread fixing devices, wherein the loose thread end can be fixed to the final winding of the thread by supplying a thread fixing fluid.

[0011] The thread can be moistened before cutting to ensure that the thread adheres as much as possible to the circumference of the full spool.

[0012] To support this, the thread-setting device can optionally be equipped with a pressure roller that is applied to the circumference of the full bobbin. It is important that the corresponding thread-setting fluid is supplied to the thread-setting devices in sufficient quantity and precisely. The quantity of thread-setting fluid must be supplied to the thread-setting devices in a sufficient quantity and in a timely manner.

[0013] It is therefore an object of the invention to provide a metering pump for supplying a thread fixing fluid, which provides the necessary thread fixing fluid to the thread fixing device with high precision and sufficient dosage.

[0014] It is a further object of the invention to provide a winding device of the generic type which has a dosing device with which a dosing of a thread fixing fluid is possible at each winding point of the winding device.

[0015] The problem with regard to the dosing pump is solved according to the invention with a dosing pump having the features of claim 1.

[0016] The object with regard to the winding device is achieved with a winding device having the features according to claim 14. Advantageous further developments of the metering pump according to the invention and the associated winding device are defined by the features and combinations of features of the subclaims.

[0017] According to one aspect of the invention, a metering pump is provided for supplying a thread fluid for fixing a thread end of a synthetic thread to a bobbin package from a winding device for winding the synthetic thread. The metering pump comprises a first piston in a fluid pump housing for conveying the thread fixing fluid and a second piston in a drive medium pump housing for driving the first piston. The first piston is mounted to the second piston by means of a common piston rod.

[0018] This offers the advantage that the thread fixing fluid can be guided separately from a drive medium and no mixing of the thread fixing fluid with the drive medium can occur.

[0019] In addition, the design of the dosing pump with a first and a second piston with a common piston rod is economical in production and effective in pumping.

[0020] This allows for simple yet precise dosing of a thread fixation fluid required for thread fixation, promptly and in the required quantities.

[0021] According to one embodiment of the metering pump, the fluid pump housing has a first piston chamber for conveying the thread fluid. This offers the advantage that precise metering of an associated thread fixing fluid is possible in the first piston chamber and, in addition, separation from the associated drive medium for driving the metering pump is possible.

[0022] According to a further embodiment of the metering pump, the first piston chamber has, on the one hand, a fluid channel for metering the thread fluid and, on the other hand, opposite the fluid channel, a piston rod bore for guiding the piston rod.

[0023] This offers the advantage and further supports the separation between an area of ​​the dosing pump that comes into contact exclusively with the thread fixing fluid and, on the other hand, allows the operation of the first piston via a piston rod that is coupled to the drive area of ​​the dosing pump.

[0024] This ensures that there is no mixing of the thread-fixing fluid and the drive medium of the metering pump. According to a further embodiment of the metering pump, the drive medium pump housing has a second piston chamber for driving the second piston.

[0025] As already mentioned, the separation of the dosing pump into a fluid pump housing and a drive media housing enables precise control of the quantity of the thread fixing fluid and also precise control of the thread fixing fluid delivered via the fluid pump housing.

[0026] By appropriate pressure control of the drive medium pump housing, the quantity of the thread fixing fluid and the conveying speed and flow rate of the thread fixing fluid can be precisely regulated and controlled.

[0027] This can be controlled and regulated with appropriate drive medium storage and / or pressure controls that can be coupled to the drive medium pump housing.

[0028] According to another embodiment of the metering pump, the second piston chamber has, on the one hand, a first drive medium supply channel for supplying a first drive medium to the second piston on the one hand and, on the other hand, opposite the first drive medium supply channel, a second drive medium supply channel for supplying a second drive medium to the second piston on the other hand.

[0029] By supplying a driving medium on opposite sides of the second piston on the one hand and the other hand through opposite driving medium supply channels of the second piston on the one hand and the other hand, it is possible to control or regulate the dosing of the dosing pump in a simple manner.

[0030] Furthermore, it is possible to supply a specified precise amount of thread fixing fluid to a thread fixing device using the respective piston chambers, in particular the first piston chamber.

[0031] On the one hand, it is possible to additionally regulate or control the supply via the second piston chamber through the drive medium supply on the one hand and the second piston on the other hand via an associated pressure control or regulation.

[0032] In this case, a corresponding regulation or control system for the drive medium supply can also be switched on.

[0033] According to a further embodiment of the metering pump, the fluid housing and the drive medium pump housing have a common piston rod bore.

[0034] This offers the advantage that precise dosing via the fluid pump housing and precise regulation and control via the drive medium pump housing are possible without the drive medium and the fluid medium coming into contact

[0035] According to a further embodiment of the metering pump, the piston rod bore connects the first piston chamber to the second piston chamber in such a way that the piston rod can be moved at least partially from the first piston chamber into the second piston chamber and vice versa.

[0036] This offers the advantage that simple and precise operation and drive of the first piston in the first piston chamber and the second piston in the second piston chamber is possible.

[0037] According to a further embodiment of the metering pump, the fluid pump housing has a check valve on or near a fluid supply channel for supplying the thread-fixing fluid into the fluid pump housing. This offers the advantage that the supplied fluid, once supplied to the fluid pump housing, can no longer flow back to the fluid dispenser.

[0038] According to a further embodiment of the metering pump, the fluid outlet of the first piston chamber of the fluid pump housing has a check valve and / or the first piston chamber and / or the second piston chamber has a vent.

[0039] This offers the advantage that the thread fixing fluid can safely leave the first piston and, in addition, a vent ensures that the dosing pump can be operated regularly and safely.

[0040] According to a further embodiment of the dosing pump, the number of dosing pumps corresponds to the number of winding points at which a free thread end is to be fixed to a final winding of a bobbin package.

[0041] This offers the advantage that, due to the respective piston chambers of the associated dosing pump, each winding point at which a thread is wound on the winding device can be reliably supplied with a thread fixing fluid.

[0042] In addition, precise dosing and timely and accurate supply of a predetermined quality and quantity of thread fixing fluid can be provided, which allows a secure fixing of a loose thread end at the corresponding winding point on the respective winding package or the corresponding bobbin.

[0043] According to a further embodiment of the dosing pump, the thread fixing fluid comprises a liquid, in particular water and / or a preparation agent, and the propellant comprises a gas, in particular compressed air.

[0044] Either a liquid or a propellant is provided in the respective piston chambers. This ensures that the liquid is supplied cleanly without contact with the propellant, which also ensures the quality of the thread fixation. According to a further design of the dosing pump, the fluid pump housing is coupled to a pressure dispenser for providing the propellant, and the propellant pump housing is coupled to a fluid dispenser for storing the thread fixation fluid.

[0045] By supplying the pressure or drive medium and the thread fixing fluid separately, it can be ensured that the dosing pump is operated safely and with high quality and that there is no mixing of the thread fixing fluid and the drive medium.

[0046] In addition, a high-quality supply of the thread fixing fluid in the desired amount for each winding point can be carried out promptly and safely without providing too much thread fixing fluid and wasting it when fixing the loose thread on the bobbin package.

[0047] According to another embodiment of the dosing pump, the dosing pump, the pressure dispenser and / or the fluid dispenser are / is coupled to a control of a winding device for winding a synthetic thread.

[0048] By coupling the dosing pump to a control system of a winding device, it can be ensured that at the right time, when a loose thread is to be fixed to the winding device or the associated winding package, it is fixed to the winding package with thread fixing fluid.

[0049] The control of the winding device additionally ensures precise regulation and control of the quantity of thread fixing fluid to be supplied, since the interaction of the dosing pump with the winding device can be controlled and monitored.

[0050] According to a further aspect of the invention, a winding device for winding a synthetic thread with a metering pump according to at least one of the preceding embodiments is provided with a traversing device for traversing the synthetic thread onto a winding spindle on a winding station to form a winding package and an alternating cutting device for severing the synthetic thread and a fluid application device for applying a thread fixing fluid, wherein the thread fixing fluid is supplied in a predetermined quantity by means of the metering pump.

[0051] The dosing pump allows a sufficient amount of thread fixing fluid to be reliably and promptly supplied to the bobbin package via the drive agent feed. This ensures that a loose thread can be securely fixed to the bobbin package at any time when removing the bobbin package.

[0052] According to a further embodiment of the winding device, the winding device has a plurality of winding stations, each winding station being assigned a dosing pump.

[0053] This ensures that at each winding point a loose thread end can be securely fixed to the winding package with the associated fluid application device by supplying thread fixing fluid from the dosing pump.

[0054] The device according to the invention and the associated winding device are explained in more detail below using some embodiments of the device according to the invention and the winding device with reference to the attached figures.

[0055] They represent:

[0056] Fig. 1 schematically shows a front view of a winding device for winding a synthetic thread with a fluid application device for fixing a fluid thread end,

[0057] Fig. 2 shows schematically a longitudinal view of the winding device shown in Fig. 1,

[0058] Fig. 3 a schematic view of the fluid application device and a circuit diagram of the coupling to a dosing pump with pressure dispenser and fluid dispenser,

[0059] Fig. 4 is a longitudinal sectional view of the metering pump according to the invention along section AA of Fig. 5, Fig. 5 is a cross-sectional view of the metering pump according to the invention along section BB of Fig. 4

[0060] In Figs. 1 and 2, a reference system with XYZ direction is indicated, wherein the Z direction defines and indicates the vertical extent of a winding device 100, the Y direction defines and indicates the depth extent of the winding device 100 and the X direction defines and indicates the longitudinal extent of the winding device 100.

[0061] Figures 1 and 2 show an embodiment of a winding device 100 for continuously winding thread 12 into a spool 13 or a spool package 13 in different views.

[0062] A bobbin 13, hereinafter also referred to as a bobbin package 13, is understood here to be a collected winding of the thread 12 on a tube, in particular on a cardboard tube, which can be plugged onto and locked into a winding spindle 3.1, 3.2 of the winding device. A bobbin package 13 here refers to a fully wound full bobbin on the tube.

[0063] In Fig. 1 the embodiment of the winding device 100 is shown in a front view and in Fig. 2 in a side view.

[0064] The winding device 100 has a winding turret 2 on which two projecting winding spindles 3.1 and 3.2 are rotatably mounted. The winding spindle 3.1 and the winding spindle 3.2 are arranged on the winding turret 2 at 180° to each other.

[0065] As shown in Fig. 2, two spindle motors 7.1 and 7.2 are assigned to the winding spindles 3.1 and 3.2 on the rear side of the winding turret 2.

[0066] The winding turret 2 is rotatably mounted in a machine frame 1 and coupled to a turret drive 10. By means of the turret drive 10, the winding spindles 3.1 and 3.2 can be pivoted alternately into a winding position and a removal position by the winding turret 2. In the situation shown in Fig. 1, the winding spindle 3.1 is arranged in the removal position and the winding spindle 3.2 is arranged in the winding position, although this can also apply vice versa.

[0067] In the winding position, the winding spindles 3.1 and 3.2 interact alternately with a pressure roller 5 at a winding point 4.1 to 4.3.

[0068] In this embodiment, a total of three winding stations 4.1 to 4.3 are arranged next to one another in the machine frame 1, as can also be seen from Fig. 2.

[0069] The respective winding point 4.1 to 4.3 is designed identically, whereby only the winding point 4.1 is described in detail for the following description as an example.

[0070] The winding station 4.1 has a traversing device 8, upstream of which a head thread guide 11 is arranged in the thread path for feeding a thread 12, which is formed into the winding package 13 in the winding position.

[0071] Between the traversing device 8 and the winding spindles 3.1 and 3.2, the pressure roller 5 is rotatably mounted on a roller support 6. The roller support 6 is pivotally coupled to the roller frame 1.

[0072] In order to lay the thread 12 at the winding point 4.1 on the circumference of a tube, the traversing device 8 has traversing means (not shown in detail here) for guiding the thread 12 back and forth. For this purpose, the traversing device 8 has a traversing drive 9, which is also coupled to a controller 25 that controls the traversing of the traversing device 8.

[0073] On the machine frame 1, an interchangeable cutting device 14 is provided, by which, during a bobbin change, the respective thread 12 is guided at the winding station 4.1 to 4.3 and cut at the respective winding station 4.1 to 4.3 to form a loose thread end 31 and to sever the continuously fed thread 12. In the situation shown in Figs. 1 and 2, the bobbin change is currently being carried out between the bobbin spindles 3.1 and 3.2, so that the bobbin spindle 3.1 is in the removal position with a plurality of bobbins 13 and the bobbin spindle 3.2 is positioned in the winding position for winding new tubes onto which thread 12 is wound.

[0074] The interchangeable cutting device 14 has been pivoted between the winding spindles 3.1 and 3.2 and has already severed the thread 12, so that a loose thread end 31 has formed on the respective winding packages 13.

[0075] Such an interchangeable cutting device 14 is also known from DE 10 2009 00 7759 A1 and described therein.

[0076] Therefore, this patent is incorporated herein by reference and no further explanation is given.

[0077] In addition to the interchangeable cutting device 14, a thread fixing device 15 is also provided, which can be arranged, for example, laterally on the machine frame 1.

[0078] The thread fixing device 15 is shown schematically in Figures 1 to 3.

[0079] As can be seen from Figs. 1 to 3, the thread fixing device 15 comprises a support 18 that is pivotable and arranged substantially parallel to the winding spindles 3.1 and 3.2. The support 18 is held on a pivot arm 17, which can be pivoted back and forth between a parking position and a thread fixing position by means of a motion actuator 16.

[0080] In Fig. 1, the thread fixing device 15 is shown in the thread fixing position, in which the thread fixing fluid 28 is applied to the winding package 13 or the final winding 29 to fix the loose thread 31. As can be seen in Figs. 1 to 3, thread fixing means 19 are provided on the carrier 18 at a suitable position for each winding point 4.1 to 4.3, which are supplied with a thread fixing fluid 28 via a respective hose line 23 via a pump 40.

[0081] The thread fixing fluid 28 is provided in a fluid dispenser 20 and is supplied to the respective thread fixing means 19 via the pump 40.

[0082] Further details about the thread fixing device are known from WO 2022 / 023051 A1. Reference is hereby made to this document and incorporated into the description. A further detailed description of the thread fixing device 15 will not be continued here.

[0083] As shown in Fig. 3, the pump 40 is a metering pump 40 (see Figs. 4 and 5), by means of which the fixing fluid 28 can be supplied from the fluid dispenser to the thread fixing application means 19.

[0084] For this purpose, the dosing pump 14 is coupled to a fluid dispenser 20, which provides the thread fixing agent 28, and a first drive medium dispenser 72 and a second drive medium dispenser 73, which each provide the drive medium for driving the dosing pump 40.

[0085] The first drive medium dispenser 72 and second drive medium dispenser 73 can, for example, have a compressed air reservoir and / or compressed air generator.

[0086] The drive medium dispenser 72 and 73 can also be a single compressed air reservoir and / or compressed air generator that supplies the entire winding device 100 with drive medium or compressed air.

[0087] In Fig. 3, the drive medium supply of the first and second drive medium 70 and 71 is shown schematically separately for better understanding. The control system 25 of the winding machine 100 is coupled to the drive medium dispensers 71 and 72, the fluid dispenser 25 of the metering pump 40, as well as to the respective drives of the traversing device 8, the winding spindle 3.1, 3.2, and the winding spindle turret 2.

[0088] This is also shown in Fig. 2, where the control 25 is coupled to the traversing drive 9, the spindle drive 7.1, 7.2 and the turret drive 10 of the winding device 100, so that the corresponding winding and the further additional steps and functions of a winding process, including the dosing of a fixing fluid 28, can be controlled.

[0089] In Figs. 4 and 5, an embodiment of the metering pump 40 according to the invention for supplying a thread fixing fluid 28 for fixing a thread end 31 to a bobbin package 13 is shown in various sectional views.

[0090] The metering pump 40 according to the invention is shown in Fig. 4 in a schematic longitudinal section and according to section AA from Fig. 5 and in Fig. 5 in a schematic cross section according to section BB from Fig. 4.

[0091] The metering pump 40 can also be designed for only one winding station 4.1, in which case only a first piston chamber 44 and a second piston chamber 66 are each formed in a fluid pump housing 43 and a driving medium pump housing 47.

[0092] In the embodiment of the metering pump 40 according to the invention shown in Figs. 4 and 5, at least three winding stations 4.1 to 4.3 are to be supplied with the fixing fluid 28. Therefore, the embodiment of the metering pump shown in Fig. 4 has three first piston chambers 44 and three second piston chambers 66 for each winding station 4.1 to 4.3, which is supplied with the thread fixing fluid via the supply or hose line 23.

[0093] The metering pump 40 according to the invention and its schematic structure are described below with reference to Figures 4 and 5 using an embodiment with a first piston chamber 44 and a second piston chamber 66, whereby this also applies to metering pumps 40 with several supply lines 23, since the respective first and second piston chambers 44, 66 and the associated supply lines and other components are each designed identically.

[0094] In an embodiment not shown, the metering pump 40 can also have a housing that can be coupled to additional chambers of the metering pump 40, so that more winding stations than those described here in the embodiment can also be supplied.

[0095] The metering pump 40 can have a plurality of first and second piston chambers 44, 66. The plurality of first and second piston chambers 44, 66 is adapted accordingly to the number of winding stations 4.1 to 4.3.

[0096] The metering pump 40 has the fluid pump housing 43 for supplying a thread fixing fluid 28, which defines a fluid region 75.

[0097] Furthermore, the metering pump 40 has the drive medium pump housing 47, which defines a drive area 85.

[0098] The fluid region 75 is designed to supply a thread fixing fluid 28 and the drive region 85 of the metering pump 40 is designed to supply or discharge a drive medium 70, 71 for operating the metering pump 40.

[0099] The metering pump 40 has a first piston chamber 44 in the fluid pump housing 43. The first piston chamber 44 has a fluid channel 42 in the thread-fixing fluid conveying direction, through which the thread-fixing fluid 28 is conveyed via a fluid outlet 41 to the hose line 23 of the thread-fixing device 15.

[0100] A check valve 63 is provided in the fluid outlet 41, preventing the thread-fixing fluid 28 to be conveyed from flowing back into the first piston chamber. Adjacent to the fluid channel 42 is a fluid collection supply channel 60, through which the thread-fixing fluid can be supplied to the first piston chamber 44. For this purpose, a fluid supply channel 61 branches off from the fluid collection channel 60 and is in fluid contact with the first piston chamber 44.

[0101] The thread fixing fluid 28 supplied in the first piston chamber 44 is driven towards the fluid channel 42 by means of a first piston 45 arranged in the first piston chamber 44 when a second piston 49 in a second piston chamber

[0102] 48 is moved back and forth with a drive medium 70, 71 in the second piston chamber 48.

[0103] For this purpose, the first piston 45 is connected or mounted to the second piston 49 via a piston rod 48. The piston rod 48 is guided in a piston rod bore 46. The piston rod bore 46 connects the first piston chamber 44 to the second piston chamber 66 such that the piston rod 48 can be moved between the first piston chamber 44 and the second piston chamber 66.

[0104] The second piston 49 is moved back and forth in the piston chamber 48 by means of alternately supplying a first and a second driving medium 70, 71, wherein during a supply stroke of the thread fixing fluid 28 the driving medium is supplied via a first driving medium supply connection 54 to the second piston 49 below the second piston

[0105] 49 is supplied via a first drive medium collection supply channel 50, which branches off into a first drive medium supply channel 51, and wherein during a suction stroke of the thread fixing fluid 28, the drive medium 70 is supplied via a second drive medium supply connection 55 to the second piston 49 above the second piston 49 via a second drive medium collection supply channel, which branches off into a second drive medium supply channel 51

[0106] By supplying the first drive medium 71 on the one hand to a lower side of the second piston 49, the second piston 49 is moved in the second piston chamber 48 toward the first piston chamber 44. This movement drive is transmitted to the first piston 45 by means of the piston rod 48. The first piston 45 then conveys the thread-fixing fluid 28 supplied in the first piston chamber 44 toward the fluid outlet 41 and to the thread-fixing device 15 connected thereto.

[0107] As a result, a precisely metered amount of thread fixing fluid 28 can be released at the fluid application device 15 at the action point on the winding package 13 for fixing a loose thread end 31 on a final winding 39.

[0108] As can also be seen from Fig. 4 and 5, the second piston chamber 48 has the first drive medium collecting supply channel 50 below and the second drive medium collecting supply channel 52 above, which, with associated branches, which are also called first drive medium supply channel and second drive medium supply channel 51, 52 below, lead into the second piston chamber, so that a back and forth movement of the second piston 49 in the second piston chamber 66 is possible.

[0109] For this purpose, depending on the required movement of the second piston 49, a first or second drive medium 70, 71 is supplied via the first drive medium collection supply channel 50 or the second drive medium collection supply channel 52, whereby the position of the second piston 49 can be controlled.

[0110] This makes it possible to precisely control the dosage of the thread fixing fluid 28.

[0111] Furthermore, a vent 80 is provided on the first piston chamber 44 opposite the fluid channel 42, which is fluid-tightly connected to the respective first piston chamber 44 via a vent collection channel 81. The vent collection channel 81 has a vent channel 82 that branches off into the associated first piston chamber 44.

[0112] Venting via the venting device 80 takes place after the respective activation of the second piston 49.

[0113] Furthermore, a fluid maintenance valve 65, a first drive medium valve 56, and a second drive medium valve 57 are provided at the end sections of the fluid collection channel 60 and the first and second drive medium collection channels 50 and 53, respectively. For maintenance and cleaning of the respective channels, the corresponding valves can be opened or unscrewed. Compressed air is preferably used as the drive medium, and water is preferably suitable as the thread-fixing fluid. However, other means for the drive medium and the thread-fixing fluid can also be used.

[0114] List of reference symbols

[0115] 1 machine frame

[0116] 2 bobbin revolvers

[0117] 3.1; 3.2 Winding spindles

[0118] 4.1-4.3 Winding point

[0119] 5 pressure roller

[0120] 6 roller supports

[0121] 7.1; 7.2 Spindle drive

[0122] 8 Traversing device

[0123] 9 Traversing drive

[0124] 10 Revolver drive

[0125] 11 Head thread guide

[0126] 12 threads

[0127] 13 spool / spool pack

[0128] 14 Change cutting device

[0129] 15 Fluid application device

[0130] 17 Swivel arm

[0131] 18 carriers

[0132] 19 Thread fixing application agent

[0133] 20 fluid dispensers

[0134] 21 holders

[0135] 23 Hose line

[0136] 24 hose end

[0137] 25 Control

[0138] 28 Thread fixing fluid

[0139] 29 Final winding

[0140] 31 Thread end

[0141] 40 Dosing pump

[0142] 41 Fluid outlet

[0143] 42 Fluid channel

[0144] 43 Fluid pump housing

[0145] 44 first piston chamber 45 fluid piston, first piston

[0146] 46 Piston rod bore

[0147] 47 Drive medium pump housing

[0148] 48 Piston rod

[0149] 49 second piston

[0150] 50 first drive medium collection channel

[0151] 51 first drive medium supply channel

[0152] 52 second drive medium collection channel

[0153] 53 second drive medium supply channel

[0154] 54 first drive medium supply connection

[0155] 55 second drive medium supply connection

[0156] 56 first drive medium valve

[0157] 57 second drive medium valve

[0158] 60 Fluid collection supply channel

[0159] 61 Fluid supply channel

[0160] 62 Inlet check valve

[0161] 63 Outlet check valve

[0162] 64 Fluid supply connection

[0163] 65 Fluid maintenance valve

[0164] 66 second piston chamber

[0165] 70 first driving medium

[0166] 71 second drive medium

[0167] 72 first propellant dispenser

[0168] 73 second propellant dispenser

[0169] 75 Fluid area

[0170] 80 Ventilation

[0171] 81 Ventilation collecting duct

[0172] 82 Ventilation duct

[0173] 85 drive area

[0174] 90 center plate

[0175] 100 winding device

Claims

A metering pump (40) for supplying a thread-fixing fluid (28) for fixing a thread end (31) of a synthetic thread to a spool package (13) from a winding device for winding the synthetic threads, comprising a first piston (45) in a fluid pump housing (43) for conveying the thread-fixing fluid (28) and a second piston (49) in a drive medium pump housing (47) for driving the first piston, wherein the first piston (45) is mounted to the second piston (49) by means of a common piston rod (48). A metering pump according to claim 1, characterized in that the fluid pump housing (43) has a first piston chamber (44) for conveying the thread-fixing fluid (28).Dosing pump according to at least one of the preceding claims 1 or 2, characterized in that the first piston chamber (44) has, on the one hand, a fluid channel (42) for dosing the thread-fixing fluid (28) and, on the other hand, opposite the fluid channel (42), a piston rod bore (46) for guiding the piston rod (48). Dosing pump according to at least one of the preceding claims, characterized in that the drive medium pump housing (47) has a second piston chamber (66) for driving the second piston (49). Dosing pump according to at least one of the preceding claims, characterized in that the second piston chamber (66) has, on the one hand, a first drive medium supply channel (51) for supplying a first drive medium (70) to the second piston (49) and, on the other hand, opposite the first drive medium supply channel (51), a second drive medium supply channel (51) for supplying a second drive medium (71) to the second piston (49).

6. Dosing pump according to at least one of the preceding claims, characterized in that the fluid pump housing (43) and the drive medium pump housing (47) have a common piston rod bore (48).

7. Dosing pump according to at least one of the preceding claims, characterized in that the piston rod bore (48) connects the first piston chamber (44) to the second piston chamber (66), so that the piston rod (48) can be moved at least in sections from the first piston chamber (44) into the second piston chamber (66) and vice versa.

8. Dosing pump according to at least one of the preceding claims, characterized in that the fluid pump housing (43) has a check valve (62) on or near a fluid supply channel (60) for supplying the thread fixing fluid (28) into the fluid pump housing (43).

9. Dosing pump according to at least one of the preceding claims, characterized in that the fluid outlet (42, 63) of the first piston chamber (44) of the fluid pump housing (43) has a check valve (63) and / or the first piston chamber (44) and / or the second piston chamber (66) has a vent (80).

10. Dosing pump according to at least one of the preceding claims, characterized in that the number of dosing pumps (40) corresponds to the number of winding stations (4.1 - 4.3) at which a free thread end (31) is to be fixed to a final winding (29) of a winding package (13).

11. Dosing pump according to at least one of the preceding claims, characterized in that the thread fixing fluid comprises a liquid, in particular water and / or a preparation agent, and the drive medium comprises a gas, in particular compressed air.

12. Dosing pump according to at least one of the preceding claims, characterized in that the fluid pump housing (43) is provided with a pressure dispenser (70; 71) for providing the drive medium and the drive medium pump housing (47) is coupled to a fluid dispenser for storing the thread fixing fluid (28).

13. Dosing pump according to at least one of the preceding claims, characterized in that the dosing pump, the pressure dispenser and / or the fluid dispenser are / is coupled to a control (25) of a winding device (100) for winding a synthetic thread (12).

14. Winding device for winding a synthetic thread (12) with a metering pump (40) according to at least one of the preceding claims with a traversing device (8) for traversing the synthetic thread (12) on a winding spindle (3.1, 3.2) at a winding point (4.1 - 4.3) for forming a winding package and an alternating cutting device (14) for severing the synthetic thread (12) and a fluid application device (15) for applying a thread fixing fluid (28), wherein the thread fixing fluid is supplied in a predetermined quantity by means of the metering pump (40).

15. Winding device according to claim 12, characterized in that the winding devices have a plurality of winding stations (4.1-4.3), each winding station (4.1-4.3) being assigned a metering pump (40).

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