DE8816477U1 - Device for yarn withdrawal - Google Patents

Abstract

In a process and device for doffing yarn bobbins, bobbin charging can be carried out automatically. The doffing device has a support frame in which one or more take-up mandrels (40) are held on one side by a mandrel-holding device (41-48). A handling device (70-73) which accepts a full bobbin has a coupling device (71) with which it can be coupled to the take-up mandrel. After coupling, the mandrel-holding device (41-48) is removed from the take-up mandrel (40) and the full yarn bobbin can be slid onto the take-up mandrel.

Description

Ludwig Resch
44-24GH

DESCRIPTION

The present invention relates to a take-off device for yarn spools according to the preamble of claim 1.

j(^a/Textile yarns, such as yarns made from natural fibres such as wool, cotton, or from synthetic fibres such as polyamide, polyester and the like, or yarns made from a mixture of such fibres, are usually wound onto tubes during manufacture, whereby these tubes are usually made from

j ₅ paper, cardboard, plastic or the like. The yarn spools produced in this way often have considerable dimensions and a weight which ^can be up to 20 kg and in some cases up to 40 kg or more, particularly if the yarn is intended for further industrial processing.

During industrial processing of the yarns, i.e. e.g. when the yarns have to be subjected to further processing steps, or when textile products are manufactured from these yarns, the yarns must be removed from the spools in an appropriate manner.

It is known to use take-off devices for yarn spools, which have a receiving mandrel onto which the

₃ q The spool is pushed onto the opening in the sleeve. The pull-off itself is carried out overhead, ie when the spool is stationary, so that the mandrel must be supported on one side.
If, for reasons of productivity, several yarns are to be

gc are to be processed further at a time, or if several yarns are required at the same time for the production of a textile product, e.g. a carpet,

The known extraction devices have several mandrels that are arranged next to and/or above each other.

In order to increase productivity, the textile industry today places great importance on the processing of yarns or the further processing of yarns being able to take place as continuously as possible. This means that the delivery of yarn to the further processing location must not be interrupted when a spool has run out.

In order to ensure a continuous supply of yarn, take-off devices are used which have at least twice as many take-up mandrels as yarns required. With these take-off devices, a second take-up mandrel with a spare spool is arranged next to or above the take-up mandrel on which the spool whose yarn is being taken off is located. The end of the yarn from the first spool, which is on the first take-up mandrel, is connected to the beginning of the yarn on the second spool, which is on the second take-up mandrel. As soon as the first spool has run out, the take-off automatically switches to the second spool. While the second spool is running out, the first spool can be replaced ^and the beginning of its yarn is then reconnected to the end of the yarn on the previous second spool. In this way, a continuous yarn run can be ensured.

The problem with all of these take-off devices is changing the bobbins. When the yarn is pulled off axially (stationary bobbin), the yarn rotates around the respective bobbin at a relatively high speed. This creates a so-called yarn balloon or thread balloon, which makes access to the mandrels where the bobbins have to be changed much more difficult. It is therefore not possible to automate such take-off devices to this day. The take-off devices lack

be monitored by an operator who, for example, when a bobbin is unwound, places a new bobbin on the freed up mandrel and connects its yarn start with the yarn end of the associated bobbin.

This manual changing of the bobbins is a very unpleasant and hard ^job when dealing with bobbins that are very heavy. Furthermore, the need for manual adjustment of the bobbins prevents the ^processing of the bobbins.

f-} The present invention is therefore based on the object of creating a extraction device which can be operated efficiently and largely without the use of manpower.

This object is achieved according to the invention by the subject matter of claim 1. Advantageous embodiments of the invention are the subject matter of the subclaims. 20

According to the present invention, a mandrel

can be removed from the mandrel. The holding of the mandrel when the mandrel holding device is removed is ensured by a handling device which holds the mandrel in its original position. The handling device, which preferably has a manipulation mandrel, carries the coil which is to be placed on the mandrel. This coil is then pushed onto the mandrel by the manipulation mandrel, whereby any empty tube which may be present is thrown off over the free end of the mandrel.

This device makes it possible for the first time to attach the spool from the side of the trigger device opposite the trigger side.

As a result, the yarn take-off on the take-off side is not hindered by the insertion process itself and it is therefore possible to use an automated handling device.

According to a preferred embodiment of the device, the empty cartridge case is initially held in a horizontal position during the ejection and is then

&rgr;&agr;&Ggr;&agr;&agr;.&igr;£&igr; to the yarn take-off direction. This has the significant advantage that the bobbins can be changed even with thin yarns when yarn is being taken off from other mandrels. It has been found that the yarn tears when the empty tube is dropped, especially when the empty tube falls in a position in which its longitudinal axis is inclined to the horizontal. The rotating, drawn-off yarn then strikes the tube, possibly even wrapping itself around the tube and then tearing. This either leads to defects in the textile products manufactured or the further processing of the yarn is interrupted. However, if the tube is left &iacgr;&eegr; uaAnororhfar Ctol lunn fai lon tsr\ Vann riac flA>-r\ Hi a

briefly touch the tube and is then deflected by the tube in a way that does not lead to the yarn breaking.

The connection between the receiving mandrel and the manipulation mandrel can preferably be force-fitting or preferably form-fitting.

With the device according to the invention described above, it is also possible to carry out a continuous yarn take-off, as is known in principle in the state of the art, as mentioned above. In this case, two take-up mandrels are provided for each take-off point, which are preferably arranged next to one another and/or

lie on top of each other and their spools are assigned to each other. This assignment means that the yarn end of the first spool is connected to the yarn start of the second spool and that the take-off takes place first from the first spool. As soon as the first spool has run out, the take-off then automatically jumps to the second spool and the first spool can then be exchanged and its yarn start connected to the yarn end of the second spool, whereby the Yor^sn*"* dsrsn usyskshrt runs out.

A particular object of the invention is further to design the device for drawing off yarn in such a way that drawing off devices can be built which have a considerably reduced space requirement compared to the known drawing off devices.

According to a particularly preferred embodiment of the present invention, the device according to the invention is therefore designed in such a way that two bobbins are arranged on the take-up mandrel at the same time, the yarn end of the bobbin at the front in the take- ^off direction being connected to the ^yarn end of the bobbin located closer to the mandrel holding element.

In this embodiment of the device according to the invention, a continuous yarn take-off is ensured without having to provide twice as many mandrels as there are take-off points. This embodiment achieves a reduction in the space required by continuously operating yarn take-off devices, which can already be described as dramatic. For example, in the prior art, 48 mandrels were previously required to provide 24 continuously running yarns, but according to this special embodiment of the device according to the invention, only 24 mandrels are required, i.e. half as many. Since the

The space requirement of a machine is primarily based on the number of recording areas and not on their length, so the space requirement of a continuously operating recording device is halved.

The change is then carried out in a simple manner as follows: As soon as the yarn has run off the front spool, a new spool is pushed onto the mandrel using the handling device and the manipulation mandrel. The empty tube of the frontmost spool is ejected forwards, i.e. in the direction of withdrawal. During this entire activity, and this is the main difference to the state of the art, the withdrawal process is continued on the same mandrel without affecting this process. The empty tube is pushed forwards and preferably initially held in a horizontal position according to the procedure described. The empty tube is then dropped and can be removed from the area of the machine using suitable devices.

According to a preferred embodiment of the device, a handling device with a manipulation mandrel can supply several receiving mandrels with new yarn spools, in which case the handling device with the manipulation mandrel is preferably arranged so as to be movable.

In order to enable fully automatic operation of the take-off device, it is also preferable that the handling device is automatically supplied with full yarn spools to be attached. This can be done, for example, by a movable handling device moving to a spool supply magazine and using the manipulation mandrel to pick up a full spool or several full spools from this spool supply magazine.

The take-off device according to the invention has a support frame to which one or more receiving mandrels are attached, which in the latter case are preferably arranged next to one another and/or one above the other. Of course, offset arrangements are also possible. The receiving mandrel or mandrels are held on one side in mandrel holding devices and hold the yarn spools. Each receiving mandrel can be connected to a handling device by means of a coupling device. The coupling device and the handling devices are designed in such a way that the mandrel holding device can be moved away from the receiving mandrel and the receiving mandrel is then held by the handling device.

It is preferable that the handling device is movable in relation to the mandrels. According to a preferred embodiment, the handling device is moved in a plane that is perpendicular to the axes of the mandrels, once in the horizontal direction, i.e. in the x direction, and once in the vertical direction, i.e. in the y direction. According to a preferred embodiment, a reference point is then determined from which the movement of the handling device in the x direction and in the y direction is counted in step pulses. In this way, it can always be determined exactly where the handling device is in relation to the position of the mandrels. According to a preferred embodiment, control sensors are provided with which the calculated position and the actual position of the handling device can be compared with one another. Microswitches or optical sensors can be used as control sensors. The approach of a mandrel can then be carried out, for example, by means of a sensor. B. be designed so that the handling device covers a specific area in the aforementioned plane, e.g. a

Window of 10 x 10 is now approached, in which the calculated position of the mandrel is located. If the mandrel is not found in this area, an alarm is triggered.
5

Preferably, the handling device has a manipulation mandrel whose diameter is such that it is smaller than the inner diameter of the empty tube of a yarn spool. As a result, the yarn spool to be changed can be carried directly by the manipulation mandrel and then pushed onto the receiving mandrel, preferably with a sliding device.

In order to achieve a horizontal fall of the empty sleeve when pushing an empty sleeve off the mandrel, a sleeve holding device is preferably provided which initially holds the empty sleeve in a horizontal position when pushing it off the mandrel. This holding function must be terminated in a short period of time, i.e. practically suddenly, so that the sleeve can then fall downwards from this horizontal position and fall with its sleeve longitudinal axis approximately parallel to the horizontal.

Preferably, devices are provided to collect the discarded tubes, these preferably being arranged under each receiving mandrel. This has the advantage that the empty tube only has to pass through one circling yarn balloon at most. The tubes are preferably conveyed by chutes and/or conveyor belts and the like to a tube collecting device from which the tubes can then be removed.

The function of the sleeve holding device is preferably carried out by an elongated body, i.e. by a type of rod, which is arranged in a bore of the mandrel. The rod is protruding from the

The mandrel can be removed, which is preferably achieved by providing this elongated body with a corresponding retaining device.

Preferably, a tension spring is provided in the bore of the mandrel, which is stretched when the elongated body is extended from the mandrel.

According to a further, preferred embodiment, the sleeve holding device has a spring-loaded locking device which causes the driver device to disengage as soon as the elongated body has been extended a certain distance from the receiving mandrel. By disengaging the driver device, the elongated body can be retracted into the receiving mandrel by the action of the tension spring mounted in the receiving mandrel. This "retraction" takes place suddenly, so that the sleeve does not significantly change its position during the retraction process. The sleeve is then still in a horizontal position as soon as the body is retracted and falls downwards from this position.

As already mentioned, it is also a particular concern of the present invention to create a take-off device that requires significantly less space than the prior art. According to a particular embodiment of the invention, the take-off device is designed in such a way that the mandrels can accommodate two spools one after the other. In the case of large take-off devices or small spools and in the case of certain types of take-off, it can also be expedient to design the mandrel in such a way that three or more spools can be accommodated.

For continuous yarn take-off, the take-off device is preferably equipped with an automatic yarn connection

Device. This yarn connecting device connects the yarn end of a first spool with the yarn beginning of a second spool associated with it. It is pointed out that this automatic yarn connecting device can be used when, according to a preferred embodiment of the invention, two or more yarn spools associated with one another are arranged on the same receiving mandrel. However, it is also possible to use such a yarn connecting device when the two spools associated with one another are held on receiving mandrels arranged next to one another or one above the other. Such a design can be necessary, for example, if a take-off device with two spools arranged one behind the other is not possible due to space constraints.

It is also preferable to have a device for searching for and detecting the end or beginning of the yarn on a yarn spool. Such a device is particularly useful if a continuous yarn flow is to be ensured. However, it can also be used if the yarn is not processed continuously, e.g. to then feed the beginning of the yarn to the further processing station.

The search process is preferably carried out in such a way that the yarn finder can be moved over the area of the spool where the yarn start or end is expected, whereby the spool is preferably rotated in the process.

A particularly important aim of the invention is to provide such a reliably functioning device for finding the beginning and end of the yarn. Since such a device for finding the yarn can be used not only for take-off devices, a

12
Aspect of the invention may claim independent protection.

The yarn finder according to the invention is designed in such a way that it has an area in which there is a negative pressure compared to the atmospheric ambient pressure, through which the yarn end or the yarn beginning is sucked in. In order to facilitate the suction process, it is preferable, particularly with hairy and heavy yarns, that a device is provided that can be integrated directly into the yarn finder, which blows compressed air onto the spool or generally onto the area in which, for example, a yarn beginning or a yarn end is being sought in a textile product or the like, in order to whirl the yarn up.

According to an alternative, also preferred embodiment of the invention, a brush is provided, which is guided over the spool and can brush up the beginning of the yarn. It has been shown that this also makes it possible to remove particularly hairy and/or heavy yarns from the spool without any problem.

The vacuum area is designed as a channel into which the yarn is sucked. This vacuum is preferably generated by compressed air that is fed to the yarn finder and flows through a suitably designed nozzle to generate the vacuum. The channel is preferably arranged inside this nozzle.

However, it is also possible to generate the negative pressure in a different way, e.g. by equipping the yarn finder with a corresponding pump. It is also possible to use a centrally acting pump that is connected to the yarn finder or yarn finders via a hose line.

Particularly in the automatic operation of a take-off device or a machine used for textile processing, regardless of type, it is very important that it is reliably determined whether the yarn finder according to the invention has actually picked up a yarn. The yarn finder is therefore preferably equipped with a yarn detection device. The presence of the yarn in the channel can be determined in various ways according to the invention. The use of an optical sensor, e.g. a light barrier, which is arranged in such a way that the light flow is interrupted as soon as the yarn is in the corresponding channel is preferred. It is also possible to build up an electric field around the channel using a suitable coil and to determine the field change caused by the yarn being drawn in.

The yarn detection device can determine whether the yarn finder has picked up a yarn. If this has not happened, e.g. within a specified time period, the corresponding spool or textile product can be marked for a special manual

According to another preferred embodiment of the yarn finder, it is equipped with a yarn holding device. This yarn holding device allows the yarn to be held in the yarn finder in order to enable further manipulation of the yarn, e.g. by inserting it into a yarn splicing device or a yarn clamping device. The advantage of using such a yarn holding device is that relatively high forces can be exerted on the yarn.

According to a preferred embodiment, the yarn holding device, which is preferably associated with the yarn finder, has a piston which presses the yarn against a

suitably shaped counterpart. The piston can be operated electrically, pneumatically or in some other mechanical way.

According to a further, preferred embodiment, a yarn cutting device is provided, which is preferably also assigned to the yarn finder. By using this yarn cutting device, it is possible to shorten the yarns detected by the yarn finder to a uniform length. This makes further processing of the yarns easier.

The yarn cutting device preferably has a knife that operates by means of a pneumatic piston and a cutting anvil, whereby the yarn is cut between the knife and the cutting anvil. In a take-off device of the type mentioned above, two yarn finders are preferably used so that the yarn start and yarn end can be recognized and detected independently of one another.

In order to guide the yarn finder at the correct distance over the spool or the textile product to be examined, the yarn finder preferably has a mechanically, optically or electrically acting sensor that holds the yarn finder at a predetermined distance over the yarn to be searched for. It has been shown that, depending on the nature of the yarn, a distance of approximately 1-10 mm, preferably 3-7 mm, preferably approximately 5 mm is appropriate.

According to another preferred embodiment of the device, which is particularly advantageous in take-off devices with continuous yarn take-off, each take-up mandrel is assigned a yarn clamping device in which the yarn end of the rearmost bobbin on the take-up mandrel is held. This allows the yarn end of the bobbin on the take-up mandrel to be easily removed from

a yarn finder or yarn connecting device if the yarn end of this spool is to be connected to the yarn beginning of another spool.

The take-off device is preferably further provided with a magazine device for yarn spools. Such a magazine device, e.g. a spool carriage, can accommodate a large number of spools which can be picked up by the handling device in order to be placed on the receiving device.

If spools with yarns of different qualities and/or different colors are required, these yarn spools are preferably arranged in different magazine devices, each of which only contains spools of the same quality and the same color. The handling device, which in this case is expediently controlled by a data processing device, can then move to the corresponding magazine device and pick up the spool required for the respective mandrel.

According to an alternative embodiment of the device, spools of different qualities and/or colors can also be arranged in the same magazine device. In this case, it must be ensured that the handling device is equipped with devices that can recognize the quality and/or color of the respective yarn and can then select the next required spool from the magazine device. Such a magazine device can, for example, be designed in such a way that different spools of yarn are arranged next to one another, which are examined one after the other by the handling device for their quality. The coding of the spools of yarn can, for example, be carried out using a bar code, the so-called bar code, which is scanned by a corresponding

corresponding reading device of the handling device is scanned. It is also possible, for example, to use magnetic strips as a code carrier or a hole coding.

According to a preferred embodiment of the extraction device, which is particularly preferred when the coils located in the magazine device are to be picked up one after the other by the handling device, i.e. without changing their order, a positioning device is provided which brings the coils into a predetermined position for pickup by the handling device.

5 Such a positioning device can ensure that the full reel to be picked up is always in the same position, so that the handling device does not have to carry out a search process, but only has to control the specified position.

The positioning device is preferably designed as a lifting device which lifts the coil from a lower position, from which it is brought from a magazine device by gravity or by appropriate conveying means, to a predetermined height.

A sensor is preferably provided which stops this lifting device when the tube of the spool has reached a predetermined height. This ensures that the tube is always in a position in which a manipulation mandrel of the handling device can be inserted into the tube, regardless of the diameter of the yarn spool. It is therefore possible to use yarn spools of different diameters in the take-off device without the take-off device having to adapt to the respective diameter of the

Thread spool must be adjusted. This is an important step towards the desired goal of achieving a largely automatic operation of the take-off device.

The sensor that detects that the tube is at a predetermined height can be mechanical or electrical, but is preferably optical. An optical sensor is then preferably used, which is arranged in the plane in which the tube axis lies and which constantly emits a light signal. During the lifting process, this light signal is initially reflected by the yarn spool, but as soon as the tube is at the height of the sensor, the light beam penetrates through the opening of the tube without being reflected. This event is used to stop the lifting device, whereby, depending on the nature of the device, a longer or shorter distance can still be covered in order to determine a final position of the tube. The tube is then in a position in which the manipulation mandrel can pick up the spool.

For reasons of space, the magazine device can be designed in such a way that the longitudinal axes of the yarn spools held in the magazine device are transverse to the axes of the holding mandrels. In this case, the positioning device can preferably have a device that rotates the spool at the same time as it is being lifted.

The positioning device can also have two rollers that are arranged parallel to the longitudinal axis of the yarn spool to be picked up. The distance between the rollers is preferably such that the yarn spool can rest on these rollers without touching other parts of the positioning device. 35

One or both rollers can then be connected to a drive device which causes the rollers and thus the yarn spool on them to rotate. This allows the yarn spool to be rotated in a simple manner, i.e.

then in this case the process of finding the yarn is preferably carried out on the positioning device.

As can be seen from the above description of preferred embodiments, the extraction device can have a very complex structure, depending on how many of the devices described are integrated into the extraction device. It is therefore preferable in any case that one or more data processing devices are provided, which preferably control the entire extraction device. In this case, several data processing units can be provided, which are then controlled by a common central data processing unit, or a correspondingly constructed central data processing unit can be provided. The extraction device then preferably has sensors which monitor the proper operation of all devices. The monitoring and control of the extraction device preferably takes place according to a corresponding program which is stored in the data processing device(s).

Furthermore, alarm devices are preferably provided which cause an acoustic and/or visual alarm to be triggered if one of the devices belonging to the extraction device is not operating properly.

The device described above is suitable for pulling the yarns overhead. This means that the yarn spool is stationary and the yarn rotates around the spool during the pull-off. However, it is expressly pointed out that the device can also be used with radially pulling

able yarn spools. In this case, the yarn spools rotate and the yarn is drawn off sideways. The design must then ensure that the rotation of the spool is possible. 5

Further advantages and features of the present invention emerge from the subclaims and the following description of an embodiment in conjunction with the drawing. 10 In this, a schematic representation shows:

Fig. 1 is a side view of the trigger mechanism from the side opposite the trigger side;

Fig. 2 is a plan view of the trigger device according to Fig. l;

Fig. 3 is a side view of the trigger device according to Fig. 1;

i'ig. 4 another side view of the trigger device according to Fig. 1;

Fig. 5 a detailed view of the support frame, where

three spools are held in the mandrel holding device, and in which the mandrel holding device is released from one spool;

20

Fig. 6 is a partially schematic sectional view of the mandrel of the embodiment according to Fig.

Fig. 7 is an enlarged view of the driver device, which is arranged in the mandrel according to Fig.;

Fig. 8 a schematic diagram of the case of a

horizontally inclined empty tube through a yarn balloon;

Fig. 9 a schematic diagram of the fall of a horizontally aligned empty tube through a yarn balloon;

Fig. 10 is a partial side view of the take-off device according to Figure 1, wherein the manipulation mandrel is uncoupled from the take-up mandrel and a yarn spool is pushed onto the take-up mandrel;

Fig. 11 a top view of the take-off device in which the bobbin change is carried out according to Fig. 10 ; 30

Fig. 12a is a sectional view of a yarn finder according to the invention;

Fig. 12b the connection of the yarn finder with a yarn cutting device ;

Fig. 13 is a schematic representation of the movement of the yarn finder over the yarn spool;

Fig. 14 is a side view of the yarn clamping device of the take-off device according to Fig. 1;

Fig. 15 is a plan view of the yarn clamping device according to Fig. 14;

Fig. 16 is a partial plan view of the yarn clamping device according to Fig. 15, the upper part being omitted for clarity;

Fig. 17 is a plan view of the yarn clamping device according to Fig. 14 with the carriage retracted;

Fig. 18 a side and partial view of the support frame and

the handling device before the replacement spool is pushed on and the yarn is connected ;

Fig. 19 is a side view corresponding to that of Fig. 18 after the replacement spool has been pushed on, showing how the yarn is held in the yarn clamping device;

• ^a · &igr; (

Fig. 20 is a front view of the positioning device;

Fig. 21 is a side view of the positioning device according to Fig. 20;

IU Fig. 22 a view of the positioning device

according to Fig. 2 0 and 21;

With reference to the above figures, an embodiment of the invention is described in which a continuous yarn take-off is implemented, in which two yarn spools can be received on a receiving mandrel.

The take-off device shown in Fig. 1 is generally designated 1. The take-off device has a support frame 2, which in the schematic representation of Fig. 1 is designed to accommodate 24 yarn spools 3, with the individual mandrels being arranged in a grid, with 6 mandrels arranged horizontally parallel to one another and 4 mandrels arranged vertically parallel one above the other, so that the mentioned total number of 24 mandrels is obtained. Since in the embodiment shown each mandrel can accommodate 2 spools, the entire take-off device in the form shown can accommodate 48 yarn spools.

The bobbin changing device 4 is arranged in front of the support frame 2 and is mounted horizontally, i.e. in the lateral direction in the direction of the double arrow 5, on a frame part 6.

is movable. The bobbin changing device has a handling device as well as a splicing device and yarn finder. A control cabinet 7 is also arranged on the frame part 6 to the left of the support frame in the figure.

This control cabinet contains, above all, a central data processing device, in this case a central computer, which controls and/or regulates the extraction device.

iü On the right side of the support frame in Fig. 1, an external magazine device 8 is shown, which in this case is designed as a spool carriage. Various spools 3 are located on the two spool carriages 9 shown. For reasons of space, the spool carriage is arranged so that its longitudinal axis is parallel to the axes of the mandrels. This means that the axes of the spools are offset by 90o from the plane in which the spools are located on the mandrel during the pull-off. The spools must therefore be rotated before being placed on the mandrels.

A top view of the take-off device according to Fig. 1 is shown in Fig. 2. In this figure, it can be seen how the bobbins are arranged one behind the other on the take-up mandrels 10, whereby the yarn is taken off the front bobbin 3a, while the rear bobbin 3b is kept as a reserve bobbin in order to ensure continuous yarn unwinding after the yarn has run off the front bobbin 3a. This situation is shown in Fig. 2 with reference to the take-up mandrel 10'. On this take-up mandrel, the empty tube 11 can be seen on its front part facing the take-off side; in this case, the take-off already takes place from the rear full yarn bobbin 3b'.

It can also be seen that the bobbin changing device 4 has a mast 12, by means of which the bobbin changing device can be adjusted in height. The height adjustment of the bobbin changing device is shown in Fig.

3, which shows a side view of the bobbin changing device.

In rig. 4 another side view is shown, from the side opposite to the view in Fig. 3. In IC of this figure it can be seen how the individual coils are arranged on the coil carriage 9.

Fig. 5 shows in a more detailed way the structure of the support frame and the function of the mandrel holding device.

As can be seen in particular with reference to Fig. 6 and 10, the support frame 2 is constructed from steel profile parts 20 running horizontally across the axis of the mandrels, from steel profile parts 21 running vertically and from steel profile parts 22 running horizontally parallel to the mandrels. In the present case, the profile parts are welded together, but it is also possible to provide a screw or other suitable connection.

The vertically and horizontally running profile parts of the support frame form individual support frame cutouts, each of which is delimited by two front profile parts 20, two rear profile parts 20, four vertical profile parts 21 and four profile parts 22 running horizontally parallel to the axes of the receiving mandrels. In each of these support frame cutouts, a receiving mandrel 40 is provided, which is designed to accommodate two yarn spools. In the present case, the receiving mandrel essentially consists of a tube, the

The outer diameter is significantly smaller than the inner diameter 32 of the opening of the sleeve 30 onto which the yarn is wound to form the spool .

Each mandrel 40 is assigned a mandrel holding device 41, which is held by the support frame 2. For this purpose, a guide rod 25 is provided on the support frame, which is fastened to the support frame in holders 26. In the present case, the guide rod 25 has a circular IC cross-section, but other types of cross-section are also possible. A guide profile 27 is also provided on the support frame, which in the present case is designed as a U-profile, with the U being open at the bottom.

The mandrel holding device 41 has a vertical support rod 42 which is fastened in a carriage 43, whereby this fastening can be carried out by welding, screwing and the like.

The carriage 43 has a horizontal bore with which the carriage is guided on the guide rod 25. The upper part of the support rod engages in the guide profile 27.

j5 An upper holding element 44 and a lower holding element 45 are attached to the support rod 42. The upper holding element 44 is designed downwards so that it can receive the corresponding part of the mandrel with a circular cross-section. A lever 46 is pivotally mounted on the lower holding element 45 about an axis 47. A spring 48, which is attached to the slide 43 of the mandrel holding device, engages the lever 46. This spring is arranged so that the lever is held in a closed position when the mandrel is carried by the mandrel holding device. The angle at which the spring is inserted is also designed so that the

Lever remains in an open position when the mandrel holding device does not support the mandrel.

The mandrel holding device functions as follows: During normal operation of the take-off device, the mandrel holding device is in the middle of the corresponding support frame cutout and carries the mandrel with the two spools on it. When a yarn spool is to be changed, the mandrel is initially held by the holding device, the function of which is explained later. The mandrel therefore always remains essentially in the same place in the support frame. The handling device has an actuating element with which the mandrel holding device can be pushed to the side, as shown in Fig.

shown, to the right. In Fig. 5, the mandrel holding device 41' is shown, which is in such an open position !^. When the mandrel holding device is moved from the closed position to the right, the lever 46 folds over to the left and releases the receiving mandrel. If the mandrel holding device is then pushed back to the receiving mandrel, the lever 46 is pushed back by the receiving mandrel into its original, upwardly vertical position and is then held there by the spring 48. In this position, the lever 46, together with the holding element 44, can then hold the receiving mandrel in the predetermined horizontal position. The receiving mandrel has, as mentioned above, a circular cross-section. In order to prevent the receiving mandrel from moving in the axial direction, a recess 66 is provided at the point on the receiving mandrel that comes into contact with the lever 46, the width of which corresponds to the width of the lever 46, into which this lever then engages.

The mandrel has a device for holding the sleeve during the ejection process. This sleeve holding device is arranged inside the tubular mandrel and has a support rod 51 which has an angle 52 at its front end which serves to adjust the support height of this support rod to the upper surface line of the mandrel. A spring 53 is arranged in the mandrel and is connected to the support rod 51 via a driver device 54. This driver device

IC 54 has a driver lever 55 which is mounted so as to be rotatable about the shaft 56. A spring 58 which loads a ball 59 is arranged in a bore 57 of the driver device. A projection 60 of the driver lever 55 rests on this ball. In the front part of the mandrel, a release bolt 61 is arranged so that its longitudinal axis is parallel to the longitudinal axis of the mandrel. The outer diameter of the release bolt is smaller than the inner diameter of the bore 57.

The function of this driver device is as follows: A new yarn spool is applied when the front spool has run out, i.e. when only its empty tube is still on the mandrel and the removal takes place from the rear spool. According to the invention, the replacement spool is pushed on from the inside, i.e. from the side of the mandrel facing the mandrel holding device. The length of the tension spring 53 and the other dimensions of the mandrel are designed so that the driver is grasped by the rear spool from which it is currently being removed when this spool has been moved by about a quarter of its tube length. The tube of the spool from which it is currently being removed therefore hits the driver and pushes it forwards, i.e. in the direction of the removal side, whereby the tension spring 53 is stretched. The

3 ^F driver then moves forward with the attached support rod in the mandrel, whereby the

The empty sleeve to be pushed out is carried by the support rod. As soon as the driver reaches the front end of the mandrel, the release bolt 61 engages in the hole 57 and pushes the projection of the driver 60 and the ball 59 back against the action of the spring 58.

This causes the driver to fold downwards and the holding function by the sleeve of the rear gar spool, which is now pushed forward, is terminated. This causes the tension spring 53 to pull the driver 54 and the

IC support rod 51 back into the mandrel.

Due to the large amount of energy stored in the tension spring 53, this acceleration of the support rod and the guide pin occurs almost instantaneously. The time period in which the support rod snaps back into the mandrel is in any case so short, with an appropriate design of the spring, that the empty sleeve pushed down by the mandrel does not change its horizontal position while the mandrel snaps back. As a result, the sleeve falls from a horizontal position

downward.

In Figures δ and 9, the falling process is shown schematically. Figure 8 shows how the empty tube falls if it is not initially held in a horizontal position. In this case, the tube tilts downwards at the front, as it first loses the support of the mandrel and falls downwards in a manner inclined to the horizontal. If the thread of the circling yarn balloon of the rear bobbin hits the tube, it can wrap around the tube and tear off. Figure 9 shows how the tube is dropped parallel to the horizontal according to an advantageous embodiment of the device according to the invention. In this parallel case, due to the then smaller expansion of the tube in the vertical direction, the probability that the yarn rotating around the yarn bobbin

The risk of the yarn hitting the tube is much lower. Furthermore, there is no danger of the yarn wrapping around the tube. Rather, the yarn hits the tube and is immediately pushed back by its curved surface. This does not result in the yarn breaking or any other impairment of the take-off process.

It has been shown in the past that in this way the empty tube can be reliably ejected even when the yarn is being drawn off at a speed of 1000 m per minute. It should be noted that this effect is not only advantageous when there are two yarn spools on the take-up mandrel. It is also advantageous in embodiments of the present invention in which there is only one yarn spool on each take-up mandrel and in which the tube must then pass through the circling thread balloon of a take-up mandrel arranged underneath when it is being changed. In this case too, the horizontal ejection of the empty tube is of considerable advantage.

As soon as the driver snaps back into the mandrel, the driver lever is simultaneously pushed upwards again by the 5 effect of the compression spring 57 and can thus be grasped by the spool again when the next spool is pushed on.

The mandrel also has a wire bracket that ensures that the tube is in a specified position on the mandrel. The wire bracket is dimensioned so that the diameter of the mandrel plus the extension of the bracket in the vertical direction roughly corresponds to the inner diameter of the tube of the thread spool.

At its end facing away from the support device, the holding mandrel has a hardened end pin 63. This end pin 63 is cylindrical and has a flattened area 64 at its end to prevent the holding mandrel from twisting in the manipulation mandrel. A chamfer 65 at the end of the cylindrical end pin 63 makes it easier to slide on the manipulation mandrel. A recess 66 in the end area of the holding mandrel serves to engage the lifting pin 46 of the mandrel holding device, whereby the holding mandrel is fixed in the mandrel holding device with respect to its longitudinal axis.

The further construction of the extraction device is described below with reference to the figures already mentioned and to Figures 10 and 11. The handling device according to the invention can be constructed in a wide variety of ways. In the present case, it consists of a frame made of aluminum square tubes, which ensure that the handling device is light. Instead of a frame, a self-supporting housing can of course also be provided. The handling device, which will be described later, can be moved parallel to the support frame 2. It can also be moved vertically on the mast 12.

Regarding the terminology, it should be noted that handling devices are referred to when the function of carrying a yarn spool and the take-up mandrel is mentioned. If the handling device is combined with yarn finders and the like, the entire device is referred to as a spool changing device.

In the present case, the handling device has a manipulation mandrel 70, which has a substantially circular cross-section and whose outer diameter is such that ei is smaller than the

Inner diameter of the sleeve of a thread spool. In the front part of the manipulation mandrel there is a bore 71 concentric to the mandrel axis, which corresponds approximately to the diameter of the end pin of the receiving mandrel.

The manipulation mandrel is mounted on a slide 72 for longitudinal movement · \d can be moved in its axial direction by a pneumatically operated cylinder 73

rrciiii. &khgr;&idigr;&lgr;&igr;\&lgr; uco «_r ^SUXt=; it tv «st-* u

nu - held by the manipulation mandrel. To do this, the handling device first moves into a position in which the receiving mandrel and the manipulation mandrel have the same axial direction. The receiving mandrel is held at this point by the mandrel holding device. Then the manipulation mandrel is moved towards the receiving mandrel and the end pin of the receiving mandrel is pushed into the hole 71 of the manipulation mandrel. The tolerances of the end pin of the receiving mandrel and the hole 71 of the manipulation mandrel are dimensioned such that the receiving mandrel is held by the friction between the pin and the hole. A movement of the receiving mandrel during the pushing on

prevents the mandrel holding device from engaging the recess of the mandrel, which is thus fixed in its longitudinal direction. Bending of the mandrel holding device, which would also lead to movement in the longitudinal direction of the mandrel, is prevented by the upper U-shaped guide profile and the support rod.

It is pointed out that the hole must have a suitable depth in order to be able to absorb the corresponding surface pressure and the leverage exerted by the mandrel. It is also pointed out that it is advisable to either drill the end pin of the mandrel or the surface of the hole of the

manipulation mandrel or both, to undergo a hardening process, in particular to increase the service life of the device.

After the mandrel holding device has been removed from the mandrel, the mandrel is only supported by the manipulation mandrel. Tests have shown that the friction between the mandrel and the manipulation mandrel is sufficient to ensure that the mandrel is held securely. If

If this force-locking connection is not suitable or advantageous for a specific application, it is still possible to make the connection between the receiving mandrel and the manipulation mandrel a form-locking one. For this purpose, the end pin of the receiving mandrel can, for example, have a circumferential groove into which a corresponding pneumatically or electrically operated element can engage. It should be noted that it must of course be ensured that such devices must be accommodated in the manipulation mandrel itself, since the manipulation mandrel must be able to accommodate the yarn spool.

The handling device 4 also has a coupling bolt 80 which engages in a corresponding hole 81 in the slide 43 of the mandrel holding device 41. In order to enable this engagement, this coupling bolt is connected to a cylinder 82 which moves the coupling bolt in the direction of the support frame 2 and can be pulled away from it. The coupling bolt is also connected to a cylinder 83 by which it can be moved laterally, i.e.

i.e. can be moved horizontally parallel to the profile parts.

When changing the coil, the coupling bolt 80 is first inserted into the bore 81 3ft of the

Mandrel holding device is inserted. The position of the hole 81 of the mandrel holding device also serves as a reference position and ensures that the manipulation mandrel is in the correct position in relation to the receiving mandrel. The manipulation mandrel is then moved towards the receiving mandrel and receives its end pin 63 in the hole 71. The cylinder 83 is now actuated and the coupling bolt pushes the mandrel holding device to the right as shown in Fig. 5, with the mandrel holding device opening at the same time. The mandrel holding device is removed from the receiving mandrel until it no longer hinders the coil change.

The handling device is also provided with a sliding device 90, which has a sliding part 91 and a sliding plate 92. The sliding part 91 is connected to a pneumatically operated cylinder 93 and can be moved by this in the direction of the yarn spool held by the manipulation mandrel.

The embodiment of the invention shown in the drawing also has a device for collecting the discarded empty cases. For this purpose, a case chute 94 is arranged under each receiving mandrel,

.15 which has an inclined plane inclined towards the support frame, through which the cases are conveyed towards the support frame. This inclined plane is also inclined at the same time towards ^a transversely arranged profile part which is located in the central plane between two receiving mandrels.

This transports the sleeve both towards the support frame and towards the level that is in the middle between the levels in which the mandrels arranged one above the other are located. In this vertical middle level there is a sleeve shaft through which the sleeves that reach the sleeve shaft via the inclined plane fall down between the mandrels

can. A conveyor device, preferably a conveyor belt, is provided beneath the tube shaft, i.e. also beneath the lowest row of mandrels, through which the empty tubes are transported to a collection container. This collection container can then be emptied regularly.

This case collection device also makes a significant contribution to the fact that the entire operating sequence of the IC trigger device can be automated.

One of the main problems that prevented the automation of the bobbin change in a continuously operated take-off device was the need to connect the yarn end of the first bobbin with the yarn beginning of the associated replacement bobbin. In order to achieve automatic operation, it is first necessary to reliably detect the yarn beginning and yarn end. According to the invention, an automatic yarn finder is provided for this purpose, the structure and operation of which is described below with reference to Figures 12a, 12b and 13.

The yarn finder according to the invention has a base body which can be made of steel, stainless steel, brass or also of a plastic such as polyamide. This base body has a main bore 102 which penetrates the base body along its entire length. In the lower part 102a of the bore an injector nozzle 103 is arranged, which is sealed against the bore 102a with a seal 104. Above the seal 104 the injector nozzle has a smaller diameter than the bore 102a, so that a gap with a circular cross-section is created. In the further part of the bore 102b both the injector nozzle and the bore are tapered, whereby the cone angle is different, so that a narrowing gap 102c is created. A bore 105 is from the

side into the base body and is connected to the bore 102. A connection IOC for a pneumatic hose 107 is screwed sealingly into this bore 105. Air is introduced into the bore 102 through this pneumatic hose 107, which flows through the circular gap and through the narrowing gap 102c. A channel 108 is provided inside the injector nozzle 103, which has a circular cross-section and whose diameter corresponds to the diameter of the other part of the bore 102d. When compressed air flows through the pneumatic hose 107, a negative pressure is created in this channel 108, the pressure difference of which from the atmospheric pressure depends on the respective diameters of the bore and injector nozzle and on the pressure of the compressed air supplied. Above the injector nozzle, there is another transverse bore 110 in which a compressed air-operated piston 111 is guided. A pneumatic hose 112 is connected to the bore 110 via a corresponding connector. The piston 111 has a hemispherical shape on its front side lila. On the sixth of the bore 102 opposite the piston, there is another bore 113 which has the same axis as the bore 110. A pressure piece 115 is screwed into this bore by means of a screw 114, which has a shape that is complementary to the shape of the front part lila of the piston 111. When the piston is now pressurized with compressed air, it is pressed forward against this pressure piece 115.

Above the hole 111, a further hole 120 is provided in which an optical sensor 121 is arranged. In the same axial direction as the hole 120, on the side opposite the hole 102, a hole 122 is arranged, in which a reflective element 124 is held by means of a screw.

36
1

The optical sensor is designed in such a way that it can both emit light and receive light reflected by the reflector 124.

In an alternative embodiment of the thread gripper, the optical sensor 121 is designed in such a way that it only emits light, while the receiving element on the other side of the thread gripper 102 is not connected to the thread gripper 122.

In any case, the optical sensor is designed in such a way that the amount of light received by the receiving element is reduced as soon as a piece of yarn is located in the bore 102.

A piece of pipe or hose 125 is screwed into the upper part 102d of the bore 102, which guides the sucked-in yarn.

The function of this yarn finder is as follows: The yarn finder is guided over a spool 3 in a specific position _, as shown in Fig. 13. In order to determine the position of the yarn finder over the spool, an element is preferably arranged which mechanically, optically or electrically monitors the distance between the yarn finder and the spool, these values then being fed to a data processing unit which compares the distance achieved with the specified target distance and

3ö if necessary, provides a change in the distance between the yarn finder and the spool.

The yarn finder is moved along a surface line of the bobbin over the bobbin, whereby in this case the bobbin is then subjected to a slow rotational movement. The yarn finder points, according to a preferred

For the purpose of sewing, there is also a device that blows compressed air onto the spool. This can loosen any stuck yarn beginning.

Especially with hairy yarns, which often "stick" firmly to the spool, it can be useful to use a brush device that presses on the yarn spool while it rotates. This also removes the yarn fano on the Smile from the
j _ _K — . ..

Coil body loosened.

As soon as the yarn finder comes close to the beginning of the yarn lying on the spool or whirled up by compressed air, this beginning of the yarn is sucked into the yarn finder by the negative pressure prevailing in the channel 108, penetrates the bore 102 and enters the pipe or hose section 125.

This reduces the amount of light received by the optical sensor 121. This event is registered by a data processing unit, which in turn controls the compressed air supply to the yarn finder so that the compressed air connection 112 is supplied with compressed air, whereby the piston 111 is moved in the direction of the pressure piece 115, thereby clamping the thread between the piston front side purple and the pressure piece. The thread is now held in the yarn finder as long as the compressed air supply in the hose 112 continues.

The compressed air supply in the hose 107 can be interrupted. The yarn is then held in the yarn finder and can be moved with it.

According to an alternative embodiment, the piston 111 is not pneumatically but electrically via a

corresponding coil is moved. Instead of the compressed air connection 112, a simple electrical connection is then provided.

Instead of the sensor 121, an electrical detection element can also be used which can detect field changes in the area of the bore 102d.

A further embodiment of the invention yarn finder is shown in Fig. 12b. In this embodiment, the

Hose section 125 is replaced by a yarn cutting device. The other parts of the yarn finder correspond to those of Fig. 12a. The yarn cutting device 130 has a channel 131 which runs in the axial direction of the channel of the yarn finder. A bore 132 is arranged transversely to this channel 131, into which a connector 133 is screwed, which is connected to a pneumatic hose 134. A piston 135 is arranged so as to be longitudinally movable in the bore 132, this piston having a knife edge 136 on its front side. A pin 137 prevents the piston from rotating in the bore 132. An anvil element 138 is arranged opposite the piston, which cooperates with the knife edge 136 to cut the yarn drawn into the bore. The anvil element 138 consists of a sleeve 139 which is rotatably mounted on a pin 140. As can be seen from the drawing, the knife edge 136 does not strike the sleeve 13S symmetrically. This causes a simultaneous rotational movement of the sleeve 139 relative to the pin 140 during cutting, which causes a
prevents premature wear of the sleeve 139.

The use of such a yarn cutting device has

the advantage that all seeds have the same length for further processing.

Although the yarn finder is described above with reference to the take-off device according to the invention, it is obvious to the person skilled in the art that such a yarn finder can also be used in other areas in which a yarn or thread beginning must be found and detected.

IC The yarn finder must be moved to carry out its work. This can be done, for example, with pneumatic cylinder-piston units that allow the yarn finder to move in the respective direction of the piston stroke. The yarn finder can also be moved with a gripper arm that can be moved around several axes, as is typical for handling machines.

Since the beginning and end of the yarn usually have to be detected on a spool, two yarn finders are usually used in the take-off device according to the invention. Since the end of the yarn is usually clamped in the area of the sleeve, one yarn finder is used in this area and thus finds the end of the yarn, while the other yarn finder moves along the surface of the yarn spool and thus finds the beginning of the yarn.

It can happen that the yarn finder described above sucks in thread remnants, which pass through the hole 102 and are then ejected through the pipe or hose section 125. In order to prevent an interruption in the yarn finding in this case, the yarn finder is preferably controlled in such a way that the clamp is only triggered when the optical signal has been checked within a certain time period. A time interval of 0.3 seconds has proven to be useful here, for example.

A pneumatic splicing device is provided to connect the yarn beginning of the second spool with the yarn end of the first spool. This splicing device can also be arranged on the frame of the handling device.

Furthermore, a · ^: yarn clamping device is provided on the support frame above each mandrel, the structure and

Function described with reference to Figures 14 to 17:,

C becomes. ~

Fig. 14 shows a side view of the yarn clamping device 150, the upper part 151 being used to clamp the yarn end, while the lower part 152 is used to hold the yarn during the sliding on of the new bobbin and in particular to determine whether the yarn beginning and yarn end are properly connected to one another and when the front bobbin has run out.

The function of the upper part 151 is best seen in Fig. 15. This upper part consists of a sheet metal part 153, which has a nose 154. A leaf spring 155 presses against this sheet metal part 153. A hole 156 is provided in the sheet metal part 153, which is closed by the leaf spring. The yarn end is inserted into this hole by means of the yarn finder and its yarn holding device, whereby the leaf spring 155 is pushed back when inserted. The hole 156 is designed in such a way that the thread is only loosely guided into this hole, which is essential for the function of this device.

The structure and function of the lower part 152 is shown in

best seen in Fig. 16 and 17. The lower part i

consists of a sheet metal part 160, which is provided in its front part with an insertion opening 161. On the

Two rods 162, 163 are arranged on the sheet metal part 160, which press the slide 165 into the position shown in Fig. 16 by means of compression springs 164 (only one is shown in the drawing for reasons of clarity). A retaining projection 166 is arranged on the slide 165.

The function of this device is described with reference to the further figures 18 and 19, which show how the connecting device and the yarn clamping device operate during the sliding on of a new bobbin.

In Fig. 18, the handling device 4 with the manipulation mandrel 70 can be seen, with the spool 3b located on the manipulation mandrel. Furthermore, a first yarn finder 170 and a second yarn finder 172, as well as a pneumatically operated splicing device 173 are shown in this illustration. The splicing device has a suction hose 174. An empty tube 11a and a replacement spool 3b are located on the upper receiving mandrel 10c.

Further coils 3c and 3d are shown schematically on the mandrel 1Od.

In Fig. 18 it can be seen how the yarn end 180 of the spool 3b is guided through the lower part 152 and the upper part 151 of the yarn clamping device 150. The yarn connection can be carried out before the manipulation mandrel is coupled to the receiving mandrel or after this coupling has taken place. The yarn connection is carried out by the splicer 173 connecting the yarn beginning 181 and the yarn end 180 to one another. To do this, the yarn end 180 is sucked in the area between the upper part 151 and the lower part 152, i.e. not the yarn end itself. The splicer cuts both yarn ends to the same length and then splices them together. The loose yarn ends are sucked out through a special hose.

so that the function of the take-off device cannot be impaired by yarn residues.

3eWhen the full bobbin 3b is inserted onto the mandrel lOc, the spliced yarn is laid down, guided by the

special opening 161 in the sheet 160 around the retaining projection 166. This state can be seen in particular in Fig. 19, here the yarn end 180 of the spool 3a is connected to the yarn beginning 181 of the spool 3b and lies above the projection 165 of the yarn clamping device 150. At the same time, the yarn end 187 of the bobbin 3b is pushed into the yarn clamping device by the second yarn finder 172 as it moves forward. The yarn finder 172 then releases the yarn end 187 and the yarn end can then be next changeover process again sucked by the splicer The folding of the yarn 180 and the yarn 181 causes a displacement of the projection 166 in the direction of the insertion opening eg, in that the springs 164 are compressed as a result of the tensile force exerted on the yarn. This

Movement of the carriage 165 is controlled by a

Figures 14 17 not shown mechanical sensor, a so-called microswitch, and reported to the data processing device. This device thus receives a signal that carries out the splicing. and the bobbin is pushed on. If the yarn has not been spliced correctly, no tensile stress is exerted on the projection 166 and the microswitch is not activated, in which case an alarm is triggered.

The yarn clamping device also has the function of detecting when a bobbin has run out. This detection occurs when the yarn jumps from the front bobbin 3a to the rear bobbin 3b. As soon as the front bobbin

has expired, the full pulling force of the take-off is exerted on the yarn end 180 of the bobbin 3a. As a result,

the carriage 165 moves backwards against the action of the spring 164. As soon as the carriage and a stripping plate 167 come to lie on top of one another, as shown in Fig. 17, the yarn is stripped off the holding projection 166. The yarn is now released from the yarn clamping device and the yarn is now drawn off from the bobbin 3b. The return of the carriage 165 to its starting position or the end stop of the carriage 165 is detected by another microswitch, which simultaneously reports to the computer that the draw-off has switched from the front to the rear bobbin. The computer now stores on which take-up mandrel this jump-over process took place and then, after the other previous empty messages have been processed, initiates a corresponding bobbin change on this take-up mandrel.

It should be noted that other sensors are also conceivable with which the fact that a yarn spool is empty can be recorded. For example, optical sensors can be used which indicate whether the yarn end 181 of the spool is still in the corresponding place or not. However, the present device is simply constructed and, as tests have shown, very reliable in its function.

The device provided for transporting the yarn spools from the spool supply magazine to the handling device is described with reference to Figures 4 and 20-22. In Figure 4, a conventional spool carriage can be seen on which individual spools 3 are arranged on several inclined planes 200. A pivotable stop 201 ensures that only one spool at a time reaches the positioning device from the spool carriage. The positioning device 210 has two rollers 211, 212 which can accommodate a full yarn spool. The two rollers 211, 212 also serve to guide the spool to find the yarn end.

start and the end of the yarn. A turntable 213 is arranged below the rollers 211, 212, which serves to rotate the positioning device by 90o so that the axis of the yarn spool located thereon is parallel to the axes of the take-up mandrels.

The positioning device is movable along a frame 215 and can be adjusted in height by means of guide rods 216, 217 by means of a spindle. For precise guidance of the positioning device along the frame 215, a gear ring 220 is provided, which can be designed, for example, as an involute gear or as a rack and pinion gear. Depending on the type of
A rack or a corresponding element 221 is then provided for the gear ring 220, into which the gear ring 220 can engage. The function of the positioning device is now as follows:

The positioning device first moves to the first bobbin carriage or, if different bobbins are to be attached, to the bobbin carriage on which the corresponding bobbin type is located. The stop 201 is released and the flushing roller can roll onto the positioning device, which is moved to its lower position for this purpose. The positioning device is then moved back to the position that can be seen on the left in Fig. 22. The bobbin is rotated by 90o, as shown schematically in Fig. 22. The bobbin is then raised. An optical sensor is provided, the light beam of which is emitted parallel to the axis of the bobbin's sleeve. As soon as the yarn bobbin is raised to a corresponding height, the emitted light is reflected by the yarn on the sleeve. This event is recorded by the data processing device.

The yarn spool is then moved further until the light from the sensor finally passes through the opening of the yarn spool sleeve

mid « > · «·«>

falls, which means that no more reflection takes place. In this position, the lifting movement of the positioning device is stopped. It is now ensured that the opening of the sleeve is at a very specific height.

The handling device moves to the position of the positioning device and can now pick up this coil with the manipulation mandrel.

In the embodiment described here, the mobile handling device is fitted with not only the manipulation mandrel, but also the first and second yarn finders and the splicing device. The yarn finders and the splicing device are each mounted or pivoted longitudinally via pneumatically operated cylinders and can be pivoted out to perform their function. This makes it possible to carry out the yarn finding function while the yarn spool is still on the positioning device and is carried and rotated by the rollers 211, 212. As soon as the yarn has been picked up by the two yarn finders, the handling device with the manipulation mandrel and the yarns held in the yarn holding devices can then be moved to the corresponding point on the

!.aiii, en ·

5 The take-off device described above with reference to Fig. 1-2 2 is characterized by the fact that the entire operation of this take-off device can be carried out fully automatically. This was not possible in the prior art. Furthermore, the take-off device is characterized by a significantly reduced space requirement compared to conventional take-off devices. This is achieved by the fact that in the take-off device described two yarn spools are held by one mandrel. This means that the number of mandrels and thus practically the space required by the take-off devices can be halved.

Claims (1)

Ludwig Resch 42-24GM 1 PROTECTION CLAIMS 1. Take-off device for yarn spools with a support frame and one or more mandrels, which are arranged essentially next to one another and/or one above the other, whereby these mandrels are mounted in mandrel holding devices which are connected to the support frame ^IU , are held on one side and hold yarn spools consisting of a tube and a yarn wound on it, from which the yarn is drawn off,
characterized, that the mandrel holding device of each mandrel can be moved away from it, that one or more handling devices are provided with which one or more full yarn spools can be handled, ² ^ that one or more coupling devices are provided for connecting a mandrel to a handling device, and that the coupling devices and these handling devices are designed in such a way that the mandrel is held by the handling device after the mandrel holding device has been moved away. 2. Extraction device according to claim 1, characterized characterized in that the handling devices are movable with respect to the receiving mandrels. 3. Extraction device according to claim 2, characterized in that the handling device is movable in a plane which is perpendicular to the axial direction of the receiving mandrels, wherein the Handling device performs a movement in the x-direction, i.e. in the horizontal direction, and a movement in the y-direction, i.e. in the vertical direction. 4. Extraction device according to claim 2, characterized in that one or more data processing units are provided for controlling the extraction device, which at least control the movement of the handling devices 5. Extraction device according to at least one of claims 2-4, characterized in that step pulse generator devices and step pulse counter devices are provided, by means of which the current position of the handling device is defined in relation to a fixed reference point. ⁶ · Extraction device according to claim 5, characterized in that control sensors are provided which detect the position of the handling device and dinnit· n . &lgr;. aiir-h riio Fiinlfhi on Aar- SnhriH-imnnlcnohor ———_ -~.. —. ——— _L ~j and the step pulse counter devices. 7· Take-off device according to at least one of claims 1-6, characterized in that each handling device has a manipulation mandrel which can accommodate one or more yarn spools. 8. Extraction device according to at least one of claims 1-7, characterized in that the coupling device consists of a shaft journal which is arranged on the receiving mandrel or on the manipulation mandrel and of a bore which is in each case de» other mandrel, the coupling being effected in such a way that the shaft journal is pushed into this bore. 9. Extraction device according to claim 8, characterized characterized in that the shaft journal and the bore have a shape such that after coupling, rotation of the two mandrels against each other is prevented. 10 10. Take-off device according to claims 7-9, characterized in that a sliding device is provided with which a yarn spool can be pushed from the manipulation mandrel onto the receiving mandrel. 11. Take-off device according to at least one of claims 1-10, characterized in that the receiving mandrel is designed so that the yarn remaining on the receiving mandrel from a previous yarn spool When a full spool of thread is inserted, the empty tube is pushed down from the mandrel in the direction in which the thread is drawn off. 12. Extraction device according to claim 11, characterized characterized in that a sleeve holding device is provided which initially holds the empty sleeve in a substantially horizontal position during the pushing off from the receiving mandrel, the sleeve holding device being designed in such a way that its Holding function within a very short period of time can be terminated so that the sleeve falls downwards from the said horizontal position. 13. Extraction device according to claim ΛA or 4% , characterized in that means are provided to to collect the dropped shells. 14. Extraction device according to claim 13, characterized in that each receiving mandrel is associated with a device for catching the sleeve . 15. Extraction device according to claim 13 or 14, characterized in that the devices for collecting the cases are connected to chutes through which the cases are guided to a case collecting device. 16. Trigger device according to at least one of claims 11-15, characterized in that the sleeve holding device has an elongated body which is arranged within the receiving mandrel and which can be extended from the receiving mandrel in the direction of the trigger. 17. Trigger device according to claim 16, characterized in that the elongated body is connected to a first spring which is stretched when the elongated body is extended from the receiving mandrel. 18. Extraction device according to claim 17, characterized in that on the elongated body a ",6 pivotable driver device is provided, which is designed in such a way that the elongated body is taken along when the sleeve is pushed out, and that a locking device is also provided which interacts with the driver device and causes the driver device to be pivoted away as soon as the elongated body has been extended a predetermined distance from the receiving mandrel, whereby the elongated body is then accelerated back into the receiving mandrel by means of the energy stored in the first spring. 19. Take-off device according to at least one of claims 1-18, characterized in that, in particular to achieve a continuous yarn take-off, a yarn connecting device is provided in order to connect the yarn end of a yarn spool with the yarn start of another yarn spool associated with it. 20. Take-off device according to at least one of claims 1-19, characterized in that the receiving mandrels are designed such that at least two yarn spools can be received one after the other. 21. Take-off device according to claim 19 and 20, characterized in that the mutually associated yarn spools are arranged on the same receiving mandrel. 22. Take-off device according to at least one of claims 19-21, characterized in that the yarn connecting device is designed as a pneumatically operating yarn splicing device. 23. Extraction device according to claim 22, characterized characterized in that the yarn splicing device has a suction pipe for sucking in the yarn end to be spliced. 24. Take-off device according to at least one of claims 19-23, characterized in that the yarn splicing device is arranged on the handling device and can be pivoted from there via a pivoting cylinder to the yarn end of the associated first yarn spool held in the region of the support frame. 25. Take-off device according to at least one of claims 22-24, characterized in that a device is provided for sucking off the yarn residues arising during yarn splicing.
5 ;. 26. Extraction device, in particular according to at least one of claims 1-25, characterized in that At least one yarn finder is provided to detect the end or beginning of a yarn spool. 10 27. Extraction device according to claim 26, characterized % indicates that the yarn finders are located over the range of ·;"'; Yarn spool are movable, at dt si yarn beginning or Y yarn ends are to be expected. 15 28. Take-off device according to claim 27, characterized in that a device is provided for the yarn spool during the search for the yarn start or end. \ Twist the yarn end. ' 20 29. Extraction device according to at least one of claims 26-28, characterized in that a device ' is provided, which holds the yarn spool during the Gamsuchens - blows compressed air to swirl up the beginning or end of the yarn. 30. Extraction device according to at least one of claims 26-28, characterized in that a brush ; is provided, which allows relative movement to the Thread spool to release the end of the thread from the thread spool. 31. Take-off device according to at least one of claims 26-30, characterized in that the yarn finder has a 35 area in which a negative pressure compared to the atmospheric ambient pressure exists through which the yarn end or the yarn beginning are sucked in. 32. Extraction device according to claim 31, characterized characterized in that the area in which negative pressure consists of a channel extending from a surface of the yarn finder facing the yarn spool, into which the beginning of the yarn or the Gsmsrtclv sin^^ssVa^t is guided.
10 33. Take-off device according to at least one of claims 31-32, characterized in that the negative pressure is generated by compressed air which is supplied to the yarn finder, the compressed air flowing in the yarn finder through a suitably designed nozzle. 34. Extraction device according to claim 3 2 and 33, characterized in that the channel is arranged inside this nozzle. 35. Extraction device according to at least one of the claims 2S-1A fiartiirrh nalrann &tgr;&ogr;�iacgr; nhncf daft riav riai-nf �iacgr; nrlay &ogr;&iacgr;&eegr;&eegr; Has a yarn detection device that triggers a signal when the yarn is picked up by the yarn finder. 25 36. Take-off device according to claim 35, characterized in that the yarn detection device has an optical sensor, preferably a light barrier. 37. Take-off device according to at least one of claims 32-36, characterized in that the optical sensor is arranged in relation to said channel in such a way that it detects the presence of a yarn in the channel. 38. Take-off device according to at least one of claims 26-37, characterized in that the yarn finder has a yarn holding device. 39. Take-off device according to claim 38 and at least one of claims 32-37, characterized in that the yarn holding device is arranged in relation to this channel in such a way that a yarn sucked into the channel Yarn thereby Z eötytjkltimnii. is.
10 40. Take-off device according to claim 38 or 39, characterized in that the yarn holding device has an electrically or mechanically, preferably pneumatically movable piston. 41. Take-off device according to claim 40, characterized in that the piston of the yarn holding device cooperates with a pressure piece, the piston moving towards or away from this pressure piece and the yarn being clamped between this piston and between this pressure piece. 42. Take-off device according to at least one of claims 26-41, characterized in that the yarn finder is connected to a yarn cutting device. 43. Take-off device according to claim 42, characterized in that the yarn cutting device has a knife edge which is movable in a bore by a pneumatic piston. 44. Extraction device according to claim 43, characterized in that the knife edge is pressed onto an anvil element, wherein the anvil element preferably consists of a sleeve which is rotatably mounted on a pin. wherein the Knife edge does not move radially with respect to this sleeve. 45. Extraction device according to at least one of claims 26-44, characterized in that each Handling unit has two yarn finders, whereby the first yarn finder is intended for searching for the beginning of the yarn and the second yarn finder for searching for the end of the yarn. 10 46. Take-off device according to at least one of claims 26-45, characterized in that the yarn finder has a mechanically or optically or electrically acting sensor which outputs a signal which the distance between the surface of the yarn finder facing the yarn spool and the surface of the yarn spool. 47. Extraction device according to claim 31 and at least one of claims 26-28 or 29-36, characterized characterized in that the distance between the effective area of the yarn finder and the surface of the yarn spool is between and 10 mm, preferably between 3 and 7 mm, preferably about 5 mm. 25 48. Take-off device according to at least one of claims 28-47, characterized in that a device is provided with the aid of which the rotary movement of the bobbin is controlled so that the yarn end after the Yarn detection is essentially located at the highest point of the tube in vertical direction" 49. Extraction device according to claim 48, characterized in that the device for controlling the rotational movement has a spring-loaded bracket, which is moved by the yarn in one direction, · I · which is parallel to the direction between the yarn finder and the exit point of the yarn from the bobbin, and electrically acting sensors are provided on this bracket with which the angular position of this bracket can be detected. 50. Take-off device according to at least one of claims 26-49, characterized in that a deposit is provided on which yarn spools are deposited if the start or end of the yarn cannot be detected within a predetermined period of time. 51. Take-off device according to at least one of claims 1-50, characterized in that each receiving mandrel is assigned a clamping device in which the yarn end of the rearmost yarn spool located on the receiving mandrel is held. 52. A take-off device according to claim 19 and claim 51, characterized in that the yarn clamping device further comprises a device for holding the connecting yarn from the first to the second yarn spool? . 53. Take-off device according to claim 52, characterized in that the device for holding the connecting yarn has a movable, spring-loaded holding projection over which the connecting yarn is guided, and that a sensor is also provided, preferably a microswitch, which emits a signal as soon as the holding projection is subjected to a yarn tensile force by the connecting yarn piece. 54. Extraction device according to claim 53, characterized in that the device for holding the connecting yarn further comprises a stripper which becomes effective when the holding projection reaches its end position and which repels the yarn from the holding projection, wherein further comprises a sensor, Preferably, a microswitch is provided which emits a signal when the stripping position is reached. 55. Take-off device according to at least one of claims 1-54, characterized in that one or more magazine devices are provided in which yarn spools of the same or different sizes are arranged. 56. Extraction device according to claim 55, characterized characterized in that a positioning device is provided which brings the yarn spools from the magazine devices into a predetermined position for receiving by the handling device. 57. Take-off device according to claim 56, characterized in that the positioning device has a lifting device with which a yarn spool can be lifted. 58. Extraction device according to claim 57, characterized in that an optical or electrical or mechanically acting sensor is provided which outputs a signal to stop the lifting device, when the bobbin tube has reached a predetermined height. 59. Extraction device according to at least one of claims 56-58, characterized in that the Positioning device has a device with which the yarn spools are rotated about a vertical axis which is perpendicular to the yarn spool’s longitudinal axis, wherein the angle of rotation is preferably greater than 0 and not greater than 60 degrees. 60. Extraction device according to claim 59, characterized characterized in that the angle of rotation is 90 degrees. 61. Extraction device according to claim 28 and at least one of claims 56-60, characterized in that the device for rotating the yarn spool about its longitudinal axis during yarn finding is connected to this positioning device. 62. Extraction device according to claim 61, characterized characterized in that the device for rotating the Yarn spool has two rotatable rollers arranged parallel to one another around its longitudinal axis, the distance between which is smaller than the diameter of the yarn spool, whereby at least one of these rollers is provided with a drive device. 63. Extraction device according to at least one of claims 56-62, characterized in that the positioning device is horizontally movable. 64. Take-off device according to at least one of claims 1-63, characterized in that the handling device and/or the yarn connecting device and/or one or two Yarn finders are combined to form a yarn spool changing device. 65. Take-off device according to claim 2 and 64, characterized in that the yarn bobbin changing device is arranged to be mobile. 66. Take-off device according to claim 65, characterized in that several receiving domes are arranged parallel to one another in a longitudinal direction and if necessary also in the vertical direction of the support frame and that the yarn spool changing device is movable along the support frame in this longitudinal direction. 67. Extraction device according to claim 65 or 66, characterized in that the chamois spool changing device is carried by a mast that can be moved longitudinally along the support frame, and that the chamois spool changing device can be moved vertically along this mast. 15 68. Extraction device according to at least one of claims 1-7, characterized in that a guide rod and a guide profile are provided on the support frame, in which the mandrel holding device is slidably mounted. 69. Extraction device according to claim 68, characterized in that the mandrel holding device has a slide which can slide along the guide rod in a horizontal direction, and that a vertical support rod is arranged on this slide which engages in the horizontally lying guide profile. 70. Extractor device according to claim 69, characterized in that an upper holding element and a lower holding element are attached to the support rod in order to receive a cylindrical part of the receiving mandrel. 71. Trigger device according to claim 70, characterized in that a lever is arranged on the lower holding element, which is mounted on an axis, a spring acting on this lever, which is arranged at an angle to this lever in such a way that the lever is held in a closed position when the mandrel holding device carries the receiving mandrel and that the lever is held in an open position by the spring when the mandrel holding device is moved away from the receiving mandrel. 72. Extraction device according to at least one of claims 1-71, characterized in that it has the following mechanical and/or optical Uxid/or electrically acting sensors: a) a sensor which detects that a yarn spool has run off a take-up mandrel; and/or b) a sensor which detects whether a yarn spool is present in the magazine device; and/or c) a sensor which detects whether a yarn spool is present on the positioning device; and/or d) a sensor which detects whether a yarn spool is mounted on the manipulation mandrel; and/or e) a sensor which detects that the position of the corresponding mandrel has been correctly approached by the handling device; and/or f) a sensor which detects that the yarn connection has been carried out correctly; and/or · g) a sensor which detects that the beginning of the yarn on the yarn spool has been found by a first yarn finder and/or h) a sensor which detects that the yarn end of a yarn spool has been correctly picked up by a second yarn finder, and/or i) a sensor which detects that the yarn spool is in such a position that the yarn end is at the top of the tube and/or k) a sensor which detects that the 5 yarn connection has been carried out correctly and/or 1) a sensor which detects that the mandrel holding device is removed from the mandrel and/or
20 m) a sensor which detects that the yarn end of the bobbin to be attached has been correctly inserted into the yarn clamping device and/or n) a sensor which detects that the yarn end of the previous bobbin located in the yarn clamping device has been correctly picked up and/or o) a sensor which detects that the tray for separating yarn spools where the yarn start and/or yarn end was not detected in a predetermined manner is full. 73. Extraction device according to at least one of claims 1-72, characterized in that a central, program-controlled data processing device 16 which receives the signals from the sensors and which controls the entire trigger device. ¹ ^ 74. Extraction device according to at least one of claims 1-73, characterized in that the extraction device has an acoustic and/or an optical signaling device which is activated by a central or a decentralized data processing unit when one of the sensors indicates that a malfunction of the extraction device has occurred.