EP3569761B1 - Method and device for feeding laundry items, in particular to a mangle - Google Patents

Method and device for feeding laundry items, in particular to a mangle Download PDF

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Publication number
EP3569761B1
EP3569761B1 EP19173346.8A EP19173346A EP3569761B1 EP 3569761 B1 EP3569761 B1 EP 3569761B1 EP 19173346 A EP19173346 A EP 19173346A EP 3569761 B1 EP3569761 B1 EP 3569761B1
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EP
European Patent Office
Prior art keywords
laundry
item
laundry item
transverse edge
length
Prior art date
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EP19173346.8A
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German (de)
French (fr)
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EP3569761A1 (en
Inventor
Eduard Regier
Engelbert Heinz
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Herbert Kannegiesser GmbH and Co
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Herbert Kannegiesser GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from DE102018006466.3A external-priority patent/DE102018006466A1/en
Application filed by Herbert Kannegiesser GmbH and Co filed Critical Herbert Kannegiesser GmbH and Co
Publication of EP3569761A1 publication Critical patent/EP3569761A1/en
Application granted granted Critical
Publication of EP3569761B1 publication Critical patent/EP3569761B1/en
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F67/00Details of ironing machines provided for in groups D06F61/00, D06F63/00, or D06F65/00
    • D06F67/04Arrangements for feeding or spreading the linen

Definitions

  • the invention relates to a method for feeding items of laundry to, in particular, a mangle according to the preamble of claim 1.
  • the invention also relates to a device for feeding items of laundry according to the preamble of claim 7.
  • Items of laundry are fed from an input machine to a downstream laundry treatment device, for example a mangle.
  • the items of laundry are first spread out by the input machine in order to be able to be fed in the spread out state to the subsequent laundry treatment machine, for example a mangle.
  • Feeding machines have a spreading device with one or more pairs of spreading clamps to spread out the items of laundry.
  • Each pair of spreader clamps has two spreader clamps that can be moved apart and together transversely to the feed direction of the items of laundry to be spread out to the downstream laundry treatment device.
  • the spreader clamps of the respective pair of spreader clamps each holding an item of laundry, are moved apart, the item of laundry held by the spreader clamps is spread out and sagging of a corner region of the front transverse edge of the laundry item held by the spreader clamps of the respective pair of spreader clamps is at least reduced, preferably almost eliminated.
  • the spreading clamps can also be moved in such a way that they center the respective item of laundry on the intended input path of the input machine.
  • the laundry item may only be spread out in such a way that the transverse edge held by the spreading clamps of the respective pair of spreading clamps between adjacent corner areas, in particular corners, which is also referred to below as the "front transverse edge to be stretched out", is not subjected to excessive tensile stress.
  • the length of the front transverse edge corresponds by definition to the width of the same, which can generally be smaller, but also larger than the length of the item of laundry.
  • the front transverse edge of the laundry item to be stretched out is determined directly before stretching out.
  • the invention is based on the object of creating a method and a device for feeding items of laundry to a mangle, for example, with which the respective item of laundry can be spread out reliably to a sufficient extent and, above all, more gently.
  • a method for solving this problem has the measures of claim 1. Accordingly, it is provided to measure the item of laundry currently held by the same before the transfer of the adjacent corner regions of the transverse edge of the item of laundry to the spreading clamps in the area of influence of holding means arranged in front of the spreading device. In this way, the length of the front transverse edge of the respective item of laundry extending over the width of the item of laundry (seen in the feed direction) can be determined before the item of laundry is spread with this transverse edge by the spreading device. As a result, the length of the front transverse edge of the respective item of laundry is already known before it is spread out. As a result, the spreading device is freed from determining the length of the front transverse edge of the respective item of laundry and the spreading process, in particular its cycle time, is shortened.
  • the length of the transverse edge and/or the width of the item of laundry in order to determine the length of the transverse edge and/or the width of the item of laundry, first the length of the item of laundry between the front transverse edge held by the holding means and the opposite rear transverse edge is measured and from the measured length of the item of laundry and/or the measured distances between the transverse edges, the width of the laundry item is derived, which corresponds to the length of the front transverse edge.
  • the length of the item of laundry i.e. the distance between the adjacent front and rear transverse edges of the same, can be easily determined when transporting the respective item of laundry to the spreading device. Above all, this measurement can be carried out with relatively high reliability and simple detection means.
  • the amount by which the spreading clamps must move apart in order to spread the front transverse edge of the item of laundry to the intended extent is already known before the item of laundry is entered into the spreading clamps. In this way, the spreading clamps can be moved apart in a controlled manner immediately after the item of laundry has been fed in.
  • the length of the transverse edges, in particular the front transverse edge, of the laundry item and the resulting width thereof are derived from the determined length of the item of laundry held on the holding means. This is preferably done on the basis of lengths and widths and/or length-width ratios of different items of laundry stored and stored in a database, in particular different items of laundry that occur or have previously been fed to the input machines by the method. This is based on the finding that each item of laundry with a specific determined length has a corresponding width and/or the items of laundry have specific length-to-width ratios.
  • the width of the item of laundry belonging to this length can be taken automatically from the database.
  • This width of the item of laundry corresponds to the length of the front transverse edge of the item of laundry and thus the spread to which the spreading clamps of the spreading device must spread or spread the front transverse edge of the item of laundry so that the sag of this transverse edge is eliminated or at least approximately eliminated and then the spread out item of laundry a mangle or another downstream laundry treatment device can be supplied.
  • the resulting width of the item of laundry or length of the transverse edge are thus already known before the item of laundry comes into the area of influence of the spreading device.
  • the process of spreading the item of laundry can be carried out quickly because measurement no longer has to be carried out during the spreading process.
  • the length of the front edge of the respective item of laundry can be determined during the further transport of the same. The measurement of the respective item of laundry is thus carried out quasi-dynamically without any loss of time.
  • the length of the item of laundry is determined by the at least one detection means when the item of laundry is held by the holding means with sagging transverse edges. Since the sagging of the two adjacent transverse edges of the item of laundry which has not yet been spread out are preferably approximately the same size, the length of the item of laundry can be determined with relatively great accuracy before it is spread apart.
  • the measurement can be made, for example, from the point of greatest sag in the middle of the leading transverse edge to the point of greatest, preferably central, sag of the other, trailing transverse edge.
  • the associated width of the item of laundry measured in terms of length is then determined, in particular sought out, from the database. Based on this width, the item of laundry is later spread out in a targeted manner in the spreading device, in particular the sagging of the upper transverse edge of the item of laundry is specifically eliminated or at least approximately eliminated.
  • a device for solving the problem mentioned at the outset has the features of claim 7 .
  • the respective item of laundry can already be measured before the spreading device.
  • the measurement no longer needs to be carried out when the item of laundry is being spread apart. This allows the item of laundry to be spread out and the front transverse edge to be stretched out faster by the spreading device because the expanding clamps can move the corners of the front transverse edge apart in a controlled manner immediately after the item of laundry has been handed over or taken over.
  • the holding means in the form of corner finders assigned to opposite longitudinal edges and/or corners or corner regions of the item of laundry.
  • the corner finders transport the respective item of laundry along the longitudinal edges, starting from the adjacent corners of the leading transverse edge to the adjacent corners of the opposite, subsequent transverse edge of the item of laundry.
  • the length of the item of laundry can be reliably determined during this onward transport of the item of laundry. The length measurement can thus be carried out continuously or dynamically, so that the cycle time is not increased as a result, because the measurement does not require the item of laundry to be stationary.
  • the at least one detection means is arranged between corner finders assigned to the opposite longitudinal edges and/or corner regions of the item of laundry. This is preferably done in such a way that a measuring axis of the at least one detection means, directed transversely to the plane of the surface of the item of laundry, intersects the sagging transverse edges, preferably at their deepest points, and detects the passage of the respective transverse edge.
  • the deepest points of the sagging of the transverse edges of the respective item of laundry successively running past the detection means form defined measuring points which allow a simple, non-contact but precise measurement of the length of the item of laundry while it is being transported further by the holding means.
  • the figures show a device that is designed as an input machine.
  • the input machine is shown in full.
  • the input machine is used to each a single, only in the Figures 3 to 8 illustrated item of laundry 10, especially flat items of laundry such as sheets, duvet covers, pillowcases, towels, tablecloths or the like, in the feed direction 11 to a mangle, not shown in the figures.
  • the device can also be used to supply items of laundry 10 to other laundry treatment devices, for example folding machines.
  • the items of laundry 10 are spread out by the device designed as an input machine before being fed to a downstream laundry treatment device. In technical jargon, one also speaks of stretching out or spreading the items of laundry 10.
  • the device or input machine shown here has three identically designed loading stations 12.
  • the loading stations 12 are assigned to the front side of the input machine at the same distance from one another in a row running transversely to the feed direction 11.
  • the invention is also suitable for input machines with a larger or smaller number of loading stations 12, and also for input machines with only a single loading station 12. Above all, the invention is also suitable for input machines with other loading stations 12. The invention is therefore not intended to device shown in the figures and in particular not be limited to the loading stations 12 shown here.
  • Each loading station 12 has a loading conveyor 18 which transports the item of laundry 10 in the feed direction 11 .
  • Each of the identically designed loading conveyors 18 of the loading stations 12 has two narrow, preferably equally wide, belt conveyors 28, 29, each with a circulating conveyor belt.
  • the belt conveyors 28 and 29 are arranged one above the other to form a sandwich conveyor, with the upper belt conveyor 28 being shorter than the lower belt conveyor 29 to form an exposed laying area 22 on the front area of an upper run of the longer lower belt conveyor 29 left free by the shorter upper belt conveyor 28.
  • Two corner finders 19 are assigned to the rear end of each loading conveyor 18 as seen in the feed direction 11 .
  • the corner finders 19 first grasp adjacent corners 16 of the later rear transverse edge 17 of the laundry item 10 from the loading conveyor 18.
  • the corner finders 19 are assigned to the rear end of the lower belt conveyor 29.
  • the corner finders 19 are also arranged on both sides next to the respective loading conveyor 18, preferably the rear end of the lower belt conveyor 29.
  • Each of the corner finders 19, which are preferably of the same design but are mirror-inverted by being arranged on opposite sides of the rear end of the lower belt conveyor 29, has two rollers 30, 31 which together form a pair of rollers with parallel longitudinal center axes or axes of rotation.
  • a nip 23 is formed between the rollers 30 and 31 of each roller pair.
  • At least one roller 30 or 31 of each corner finder 19 can be driven in rotation.
  • the roller 31 of each corner finder 19 can be driven in rotation.
  • the drivable rollers 31 of each corner finder 19 lying on opposite sides of the loading conveyor 18 and/or belt conveyor 29 can be driven separately in the exemplary embodiment shown.
  • the roller 31 of each corner finder 19 is assigned its own drive.
  • the drive is designed as a belt drive with a toothed belt 38 and a toothed belt pulley 39 on the side next to each roller 31 .
  • the drive can also be a direct drive.
  • An electric servo motor which has a path measuring device, in particular a rotary angle measuring device, is preferably used as the drive motor.
  • the path covered on the circumference of the roller 31 can be determined from this.
  • the common angle of rotation can also be used to calculate the distance covered by the respective longitudinal edge 34 of the item of laundry 10 when passing through the rollers 30 and 31 of the respective corner finder 19 .
  • the corner finder 19 of each loading station 12 is followed by a pair of transfer clamps 20 with two transfer clamps 21.
  • the pair of transfer clamps 20 of the respective loading station 12 takes over adjacent corner regions, preferably corners 16, of the not yet extended (sagging) transverse edge 17 of the item of laundry 10 from the corner finders 19 and transports it to two spreading clamps 15 of a pair of spreading clamps of the spreading device 13.
  • the spreading clamps 15 then take over the corners 16 of the transverse edge 17 of the item of laundry 10 from the transfer clamps 21 of the pair of transfer clamps 20 or, from the transfer clamps 21 of the pair of transfer clamps 20, they delimit the transverse edge 17 of the item of laundry 10 Corners 16 of the still unspread laundry item 10 passed to the spreading clamps 15 with the transverse edge 17 still sagging.
  • a pair of transfer clamps 20 is provided between the corner finders 19 of each loading station 11 and the spreader 13 .
  • one transfer clamp 21 of a transfer clamp pair 20 is assigned to each of the two opposite corner finders 19 of each loading station 12 .
  • the two transfer clamps 21 of each transfer clamp pair 20 are combined.
  • the respective pair of transfer clamps 21 thus forms a double clamp for one of the opposite corners 16 of the transverse edge 17, preferably the front transverse edge 17, of the item of laundry 10.
  • the pair of transfer clamps 20 of each loading station 12 can be moved onto a carriage on a rail 24 .
  • the rail 24 of the central loading station 12 runs in a straight line in the feed direction 11 along the center of the input machine and the feed conveyor 17. This rail 24 runs upwards in the feed direction. Longer rails 24 running obliquely upwards and in the direction of the spreading device 13 extend from the outer loading stations 12 .
  • Both rails 24 of the opposite outer loading station 12 are of the same length, but directed differently, so that their rear ends seen in the feed direction converge to the
  • the ends of the rails 24 of all pairs of transfer clamps 20 lie on a common horizontal (imaginary) line that is parallel to the at least one rail 24 of the spreading device 13 runs, but at a distance in front of it and/or above it.
  • the lengths of the rails 24 and the positioning of their ends pointing towards the spreading device 13 are such that the spreading clamps 15 can run past the transfer clamps 21 without colliding.
  • Each loading station 12 is assigned a detection means, which is a sensor 27 in the exemplary embodiment shown. If necessary, the detection means can also have several sensors 27 . Additional detection means, not shown in the figures, can be assigned to the loading stations 12 .
  • the sensor 27 forming the detection device is assigned to the upper end of the respective loading conveyor 18 . This assignment is made such that the sensor 27 follows the corner finder 19 and its rollers 30 and 31 in the direction of passage 32 of the respective item of laundry 10 through the nip 23 of each corner finder 19, i.e. the two rollers 30 and 31.
  • the sensor 27 is arranged behind the corner finders 19 in such a way that it is located centrally between them and preferably lies on a vertical longitudinal center plane of the belt conveyors 28 and 29 of the respective loading station 12 .
  • the sensor 27 is assigned to the corner finders 19 in such a way that a measuring beam 26 of the sensor 27 runs parallel below an imaginary plane through the axes of rotation of the rollers 30 and 31 of both corner finders 19 .
  • the measuring beam 26 is directed transversely to the central axes of rotation of the rollers 30 and 31 .
  • the measuring beam 26 does not run through the axes of rotation of the rollers 30 and 31 of the corner finders 19, but in the direction of passage 32 of the item of laundry 10 through the loading station 12 and the corner finders 19 behind or below ( 3 ).
  • the senor 27 is part of a light barrier.
  • the sensor 27 is assigned a reflector 33 spaced therefrom.
  • a mirror or a receiver can also be provided.
  • the reflector 33 or mirror or receiver is located on a side of the roller 31 of each corner finder 19 that faces away from the nip 23.
  • the sensor 27 is located on a side of the other roller 30 of each corner finder 19 that faces away from the nip 23.
  • the measuring beam 26 extends transversely to a plane in which the item of laundry 10 is located after it has passed through the roller gaps 23 of the corner finders 19 in the throughput direction 32 .
  • the sensor 27 can thus detect the passage of the first front transverse edge 17 and then the rear transverse edge 17, after which this rear transverse edge 17 becomes the front transverse edge 17, which is then stretched by the spreading device 13 in order to eliminate or at least largely eliminate its sagging 35.
  • the sensor 27 is preferably one that determines an analog measurement signal or an analog measured value.
  • the respective sensor 27 is also designed in such a way that it supplies the measurement results very quickly, in particular measurement signals that follow closely in time.
  • the sensor 27 supplying analog measurement signals is designed in such a way that it supplies measurement signals, in particular length and/or distance measurement values, with an output measurement frequency of less than 20 ms.
  • a single item of laundry 10 is placed manually on the placement area 22 of the loading conveyor 18 of a respective loading station 12 .
  • the item of laundry 10 is then transported by the loading conveyor 18 to the two opposite sides of the upper or rear end of the loading conveyor 18 and/or to the corner finders 19 assigned to it.
  • Each corner finder 19 then first takes over a corner 16 or a corner area of the leading transverse edge 17 of the laundry item 10. Opposite corners 16 of the leading transverse edge 17 reach the roller gap 23 of each corner finder 19 on opposite sides of the loading conveyor 18. As a result of the pairs Counter-rotating rollers 30 and 31 of each corner finder 19 now transport the item of laundry 10 on its opposite longitudinal edges 34 through the corner finder 19 .
  • Each longitudinal edge 34 is located in the nip 23 of a corner finder 19.
  • the transport of the item of laundry 10 through the corner finder 19 is stopped as soon as opposite corners 16 or corner regions of the subsequent transverse edge 17 reach or have reached the corner finder 19 ( 7 and 8th ).
  • This transverse edge 17 thus becomes the front transverse edge 17 to be stretched out.
  • corners 16 of the transverse edge 17 enter the nip 23 of each corner finder 19 simultaneously, both corner finders 19 are stopped simultaneously.
  • the drives of the rollers 30, 31 of both corner finders 19 are stopped at the same time.
  • the driving of the pair of rollers of a corner finder 19 is stopped correspondingly later than the driving of the pair of rollers of that corner finder 19 holding the leading corner 16 .
  • the trailing transverse edge 17 of the item of laundry 10 becomes the front transverse edge 17 of the item of laundry 10 whose sag is to be at least largely reduced by the spreading device 13. With this Now leading the front transverse edge 17, the item of laundry 10 spread out or stretched out by the spreading device 13 runs into the mangle or another laundry treatment machine.
  • the transverse edges 17 of the item of laundry 10 still have a relatively large sag 35 at the opposite longitudinal edges 34 through the corner finders 19 when the same is being transported. As a result, the item of laundry 10 has not yet been spread out and is not yet ready to be transferred to the mangle or another laundry treatment machine.
  • a length measurement of the item of laundry 10 is carried out. This length measurement is carried out with the sensor 27 and the reflector 33 interacting therewith or alternatively with a mirror, a receiver or another detection means.
  • the detection means measures the deepest point 36, 37 of the sag 35 of the two successive transverse edges 17 of the item of laundry 10 without contact and one after the other.
  • the leading transverse edge 17 leaves the area of influence of the corner finder 19 with the outwardly curved, concave transverse edge 17 as it is transported further in the throughput direction 32.
  • the length measurement of the Laundry item 10 started by the laundry item 10 interrupts the measuring beam 26 ( figure 5 and 6 ).
  • the measuring beam 26 of the sensor 27 is released again from the deepest point 36 of the inwardly curved, sagging trailing transverse edge 17 ( 7 and 8th ). At this time, the length measurement of the laundry item 10 is stopped.
  • the length of the item of laundry 10 can be determined by measuring the time or period of time that elapses from the interruption of the measuring beam 26 by the deepest point 37 of the leading transverse edge 17 to the release of the measuring beam 26 by the deepest point 36 of the trailing sagging transverse edge 17 . From the known circumferential speed of the rollers 30, 31 of the pair of rollers of each corner finder 19 and the measured time, the length of the item of laundry 10 can be determined by calculation.
  • the length of the item of laundry 10 can also be determined by a direct distance measurement.
  • the driven roller 31 of each corner finder 19 or possibly also the other roller 30 is assigned a displacement sensor directly or indirectly.
  • the indirect assignment of the displacement sensor to the roller 31 or possibly also to the roller 30 of each corner finder 19 takes place at the drive of the relevant roller 31 or 30.
  • a servomotor used to drive the respective roller 31 or 30 is preferably provided with a displacement sensor.
  • the displacement pickup is preferably a rotation angle pickup.
  • the length of the item of laundry 10 is measured according to the method described above while the item of laundry 10 is being transported through the corner finder 19.
  • the measurement is preferably carried out before the rotating drive of the rollers 30, 31 of the corner finder 19 is stopped, i.e. before the front transverse edge 17 delimiting corners 16 have run into the corner finder 19.
  • the length measurement of the item of laundry 10 is thus completed before the drives of the rollers 30, 31 of the corner finders 19 are stopped in order to transfer the opposite corners 16 of the now front transverse edge 17 found by the corner finders 19 to a respective pair of transfer clamps 20.
  • the width of the same or the length of the front transverse edge 17 is determined from the determined length of the laundry item 10.
  • the length of the front transverse edge 17 corresponding to the width of the laundry item 10 is determined using the previously measured length of the laundry item 10 by reading out the width of the respective laundry item 10 associated with the measured length from a database. This is based on the knowledge that items of laundry 10 with standard dimensions are usually processed. Accordingly, an item of laundry 10 of a specific length has a corresponding, defined width and thus length of the transverse edge 17 running transversely to the feed direction 11 .
  • the database or memory belong to the device and are part of the method. As soon as the length of an item of laundry 10 has been measured, the width of the item of laundry 10 associated with this measured length is determined and queried or read out using this length from the database. This width can then be used for the subsequent spreading of the item of laundry 10 with the spreading device 13 .
  • the lengths of all items of laundry 10 present and the associated widths or length-to-width ratios are initially stored in the database. Should it happen that a length is measured that is not stored in the database with the associated width, this can indicate an incorrect measurement or an "alien" item of laundry 10 in a batch of laundry. Such items of laundry 10 are then sorted out, i.e. not supplied to the spreading device 13, in particular because it cannot spread out items of laundry 10 whose width cannot be determined.
  • the length of the front transverse edge 17 of the item of laundry 10 to be spread by the spreading device 13 is also known.
  • the length of the transverse edge 17 corresponds to the width of the item of laundry 10.
  • the item of laundry 10 is now spread out by the spreading device 13 by deliberately moving apart the two opposite corners 16 of the transverse edge 17 holding spreading clamps 15 and thereby the front transverse edge 17 stretched to such an extent that its slack 35 is eliminated or at least eliminated as far as possible without overstretching the transverse edge 17 .
  • the spreading clamps 15 are moved apart in a number of stages or steps, each with different speeds, depending on the previously determined length of the transverse edge 17 .
  • the spreading clamps 15 are initially moved apart fairly quickly, but braked shortly before the calculated length of the transverse edge 17 is reached and moved apart at a lower speed in order to slowly and completely spread out the item of laundry 10 . This allows an exact approach to the position of the spreading clamps 15 leading to the greatest possible spreading out of the item of laundry 10 and to the greatest possible protection of the item of laundry 10 during the complete and/or greatest possible spreading out or stretching.

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  • Textile Engineering (AREA)
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Description

Die Erfindung betrifft ein Verfahren zum Zuführen von Wäschestücken zu insbesondere einer Mangel gemäß dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft des Weiteren eine Vorrichtung zum Zuführen von Wäschestücken gemäß dem Oberbegriff des Anspruchs 7.The invention relates to a method for feeding items of laundry to, in particular, a mangle according to the preamble of claim 1. The invention also relates to a device for feeding items of laundry according to the preamble of claim 7.

Wäschestücke, und zwar vor allem sogenannte Flachwäsche wie Tischwäsche, Bettwäsche und dergleichen, werden von einer Eingabemaschine einer nachfolgenden Wäschebehandlungseinrichtung, beispielsweise einer Mangel, zugeführt. Von der Eingabemaschine werden die Wäschestücke zunächst ausgebreitet, um im ausgebreiteten Zustand der nachfolgenden Wäschebehandlungsmaschine, beispielsweise Mangel, zugeführt werden zu können.Items of laundry, specifically so-called flat linen such as table linen, bed linen and the like, are fed from an input machine to a downstream laundry treatment device, for example a mangle. The items of laundry are first spread out by the input machine in order to be able to be fed in the spread out state to the subsequent laundry treatment machine, for example a mangle.

Eingabemaschinen verfügen zum Ausbreiten der Wäschestücke über eine Spreizeinrichtung mit einem oder auch mehreren Spreizklammerpaaren. Jedes Spreizklammerpaar verfügt über zwei quer zur Zuführrichtung der auszubreitenden Wäschestücke zur nachfolgenden Wäschebehandlungseinrichtung auseinander- und zusammenfahrbare Spreizklammern. Beim Auseinanderfahren der jeweils ein Wäschestück haltenden Spreizklammern des jeweiligen Spreizklammerpaars wird das von den Spreizklammern gehaltene Wäschestück ausgebreitet und dabei ein Durchhang eines zwischen benachbarten, von den Spreizklammern des jeweiligen Spreizklammerpaars gehaltenen Eckbereichen des vorderen Querrands des Wäschestücks zumindest verringert, vorzugsweise annähernd beseitigt. Die Spreizklammern können außerdem so verfahren werden, dass sie das jeweilige Wäschestück mittig auf der vorgesehenen Eingabebahn der Eingabemaschine zentrieren.Feeding machines have a spreading device with one or more pairs of spreading clamps to spread out the items of laundry. Each pair of spreader clamps has two spreader clamps that can be moved apart and together transversely to the feed direction of the items of laundry to be spread out to the downstream laundry treatment device. When the spreader clamps of the respective pair of spreader clamps, each holding an item of laundry, are moved apart, the item of laundry held by the spreader clamps is spread out and sagging of a corner region of the front transverse edge of the laundry item held by the spreader clamps of the respective pair of spreader clamps is at least reduced, preferably almost eliminated. The spreading clamps can also be moved in such a way that they center the respective item of laundry on the intended input path of the input machine.

Das Ausbreiten der Wäschestück darf nur derart erfolgen, dass der von den Spreizklammern des jeweiligen Spreizklammerpaars zwischen benachbarten Eckbereichen, insbesondere Ecken, gehaltene Querrand, der im Folgenden auch als "auszustreckender vorderer Querrand" bezeichnet wird, keiner übermäßigen Zugbelastung ausgesetzt wird.The laundry item may only be spread out in such a way that the transverse edge held by the spreading clamps of the respective pair of spreading clamps between adjacent corner areas, in particular corners, which is also referred to below as the "front transverse edge to be stretched out", is not subjected to excessive tensile stress.

Es ist bereits bekannt, das übermäßige Strecken des auszubreitenden, in Eingaberichtung voraneilenden Querrands des Wäschestücks, zu vermeiden, indem die Länge des vorderen Querrands des Wäschestücks gemessen wird. Die Länge des vorderen Querrands entspricht bezogen auf die Zuführrichtung des Wäschestücks definitionsgemäß der Breite desselben, die in der Regel kleiner, aber auch größer als die Länge des Wäschestücks sein kann.It is already known to avoid excessive stretching of the transverse edge of the item of laundry to be spread out, leading in the direction of input, by measuring the length of the front transverse edge of the item of laundry. The length of the front transverse edge, based on the feed direction of the item of laundry, corresponds by definition to the width of the same, which can generally be smaller, but also larger than the length of the item of laundry.

Gemäß der EP 2 045 391 A2 und der EP 3 181 752 A1 wird der auszustreckende vordere Querrand des Wäschestücks vor dem Ausstrecken direkt ermittelt.According to the EP 2 045 391 A2 and the EP 3 181 752 A1 the front transverse edge of the laundry item to be stretched out is determined directly before stretching out.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Zuführen von Wäschestücken zu zum Beispiel einer Mangel zu schaffen, womit das jeweilige Wäschestück zuverlässig im ausreichenden Umfang und vor allem auch schonender ausbreitbar ist.The invention is based on the object of creating a method and a device for feeding items of laundry to a mangle, for example, with which the respective item of laundry can be spread out reliably to a sufficient extent and, above all, more gently.

Ein Verfahren zur Lösung dieser Aufgabe weist die Maßnahmen des Anspruchs 1 auf. Demnach ist es vorgesehen, schon vor der Übergabe der benachbarten Eckbereiche des Querrands des Wäschestücks an die Spreizklammern im Einflussbereich von vor der Spreizeinrichtung angeordneten Haltemitteln das von denselben momentan gehaltene Wäschestück zu vermessen. Es kann dadurch die sich über die Breite des Wäschestücks (in Zuführrichtung gesehen) erstreckende Länge des vorderen Querrands des jeweiligen Wäschestücks ermittelt werden, bevor das Wäschestück mit diesem Querrand von der Spreizeinrichtung gespreizt wird. Die Länge des vorderen Querrands des jeweiligen Wäschestücks ist dadurch schon vor dem Ausbreiten desselben bekannt. Dadurch wird die Spreizeinrichtung von der Ermittlung der Länge des vorderen Querrands des jeweiligen Wäschestücks befreit und der Spreizvorgang, insbesondere seine Taktzeit, verkürzt.A method for solving this problem has the measures of claim 1. Accordingly, it is provided to measure the item of laundry currently held by the same before the transfer of the adjacent corner regions of the transverse edge of the item of laundry to the spreading clamps in the area of influence of holding means arranged in front of the spreading device. In this way, the length of the front transverse edge of the respective item of laundry extending over the width of the item of laundry (seen in the feed direction) can be determined before the item of laundry is spread with this transverse edge by the spreading device. As a result, the length of the front transverse edge of the respective item of laundry is already known before it is spread out. As a result, the spreading device is freed from determining the length of the front transverse edge of the respective item of laundry and the spreading process, in particular its cycle time, is shortened.

Dazu ist es vorgesehen, dass zur Ermittlung der Länge des Querrands und/oder der Breite des Wäschestücks zunächst die Länge des Wäschestücks zwischen dem von den Haltemitteln gehaltenen vorderen Querrand und dem gegenüberliegenden hinteren Querrand gemessen wird und aus der gemessenen Länge des Wäschestücks und/oder den gemessenen Abständen der Querränder die Breite des Wäschestücks abgeleitet wird, die der Länge des vorderen Querrands entspricht. Die Länge des Wäschestücks, also der Abstand zwischen den benachbarten vorderen und hinteren Querrändern desselben, lässt sich einfach beim Weitertransport des jeweiligen Wäschestücks zur Spreizeinrichtung ermitteln. Vor allem kann diese Messung mit verhältnismäßig großer Zuverlässigkeit und einfachen Detektionsmitteln erfolgen.To this end, it is provided that, in order to determine the length of the transverse edge and/or the width of the item of laundry, first the length of the item of laundry between the front transverse edge held by the holding means and the opposite rear transverse edge is measured and from the measured length of the item of laundry and/or the measured distances between the transverse edges, the width of the laundry item is derived, which corresponds to the length of the front transverse edge. The length of the item of laundry, i.e. the distance between the adjacent front and rear transverse edges of the same, can be easily determined when transporting the respective item of laundry to the spreading device. Above all, this measurement can be carried out with relatively high reliability and simple detection means.

Bevorzugt ist es vorgesehen, die Breite des Wäschestücks, die der Länge des Querrands des Wäschestücks entspricht, vor der Übergabe desselben an die Spreizeinrichtung zu ermitteln. Dadurch ist das Maß, um das die Spreizklammern auseinanderfahren müssen, um den vorderen Querrand des Wäschestücks im vorgesehenen Umfang zu spreizen, schon bekannt, bevor das Wäschestück in die Spreizklammern eingegeben wird. So können die Spreizklammern nach dem Eingeben des Wäschestücks sofort gezielt gesteuert auseinandergefahren werden.Provision is preferably made for the width of the item of laundry, which corresponds to the length of the transverse edge of the item of laundry, to be determined before it is transferred to the spreading device. As a result, the amount by which the spreading clamps must move apart in order to spread the front transverse edge of the item of laundry to the intended extent is already known before the item of laundry is entered into the spreading clamps. In this way, the spreading clamps can be moved apart in a controlled manner immediately after the item of laundry has been fed in.

Gemäß einer bevorzugten Ausgestaltung des Verfahrens ist es vorgesehen, dass von der ermittelten Länge des an den Haltemitteln gehaltenen Wäschestücks die Länge der Querränder, insbesondere des vorderen Querrands, des Wäschestücks und die daraus resultierende Breite desselben abgeleitet werden. Das geschieht bevorzugt anhand von in einer Datenbank hinterlegten und abgespeicherten Längen und Breiten und/oder Längen-Breiten-Verhältnissen verschiedener Wäschestücke, insbesondere verschiedener vorkommender oder bislang nach dem Verfahren den Eingabemaschinen zugeführten Wäschestücken. Hierbei wird von der Erkenntnis ausgegangen, dass zu jedem Wäschestück mit einer bestimmten ermittelten Länge eine dazu korrespondierende Breite gehört und/oder die Wäschestücke über bestimmte Längen-Breiten-Verhältnisse verfügen.According to a preferred embodiment of the method, it is provided that the length of the transverse edges, in particular the front transverse edge, of the laundry item and the resulting width thereof are derived from the determined length of the item of laundry held on the holding means. This is preferably done on the basis of lengths and widths and/or length-width ratios of different items of laundry stored and stored in a database, in particular different items of laundry that occur or have previously been fed to the input machines by the method. This is based on the finding that each item of laundry with a specific determined length has a corresponding width and/or the items of laundry have specific length-to-width ratios.

Nach der Messung der Länge des Wäschestücks kann automatisch die zu dieser Länge gehörende Breite des Wäschestücks aus der Datenbank entnommen werden. Diese Breite des Wäschestücks entspricht der Länge des vorderen Querrands des Wäschestücks und somit dem Spreizmaß, auf das die Spreizklammern der Spreizeinrichtung die vordere Querkante des Wäschestücks ausbreiten bzw. spreizen müssen, damit der Durchhang dieser Querkante beseitigt oder zumindest annähernd beseitigt wird und daraufhin das ausgebreitete Wäschestück einer Mangel oder einer sonstigen nachfolgenden Wäschebehandlungseinrichtung zugeführt werden kann.After the length of the item of laundry has been measured, the width of the item of laundry belonging to this length can be taken automatically from the database. This width of the item of laundry corresponds to the length of the front transverse edge of the item of laundry and thus the spread to which the spreading clamps of the spreading device must spread or spread the front transverse edge of the item of laundry so that the sag of this transverse edge is eliminated or at least approximately eliminated and then the spread out item of laundry a mangle or another downstream laundry treatment device can be supplied.

Andere Weiterbildungsmöglichkeiten des Verfahrens sehen es vor, dass nach der Ermittlung der Länge des Wäschestücks bei zwischen den von den Haltemitteln gehaltenen Eckbereichen, vorzugsweise Ecken, an gegenüberliegenden Enden des vorderen Querrands des Wäschestücks dieses von den Haltemitteln direkt an zwei Spreizklammern eines Spreizklammerpaars übergeben wird. Alternativ kann es vorgesehen sein, dass die Eckbereiche bzw. Ecken des jeweiligen vermessenen Wäschestücks von den Haltemitteln zunächst an andere Haltemittel übergeben werden, die das Wäschestück dann erst mit benachbarten Ecken oder Eckbereichen des vermessenen vorderen oder oberen Querrands an die beiden Spreizklammern eines jeweiligen Spreizklammerpaars übergeben. Die genannten Vorgehensweisen stellen sicher, dass der voraneilende Querrand des jeweiligen Wäschestücks vermessen ist, bevor dieses an die Spreizklammern übergeben wird. Die daraus sich ergebende Breite des Wäschestücks bzw. Länge des Querrands sind somit schon bekannt, bevor das Wäschestück in den Einflussbereich der Spreizeinrichtung kommt. Dadurch kann der Spreizvorgang des Wäschestücks zügig erfolgen, weil keine Messung beim Spreizvorgang mehr vorgenommen werden muss. Außerdem lässt sich die Länge des vorderen Rands des jeweiligen Wäschestücks während des Weitertransports desselben ermitteln. Die Vermessung des jeweiligen Wäschestücks erfolgt so quasi dynamisch ohne Zeitverlust.Other possible developments of the method provide that after the length of the item of laundry has been determined between the corner regions held by the holding means, preferably corners, at opposite ends of the front transverse edge of the item of laundry, the item of laundry is transferred directly from the holding means to two expanding clamps of a pair of expanding clamps. Alternatively, it can be provided that the corner areas or corners of the respective measured item of laundry are first transferred from the holding means to other holding means, which then only transfer the item of laundry to the two expanding clamps of a respective pair of expanding clamps with adjacent corners or corner regions of the measured front or upper transverse edge. The procedures mentioned ensure that the leading transverse edge of the respective item of laundry is measured before it is transferred to the spreading clamps. The resulting width of the item of laundry or length of the transverse edge are thus already known before the item of laundry comes into the area of influence of the spreading device. As a result, the process of spreading the item of laundry can be carried out quickly because measurement no longer has to be carried out during the spreading process. In addition, the length of the front edge of the respective item of laundry can be determined during the further transport of the same. The measurement of the respective item of laundry is thus carried out quasi-dynamically without any loss of time.

Eine vorteilhafte Weiterbildung des Verfahrens sieht es vor, dass die Länge des Wäschestücks vom mindestens einen Detektionsmittel bei von den Haltemitteln mit durchhängenden Querrändern gehaltenem Wäschestück ermittelt wird. Da die Durchhänge beider benachbarter Querränder des noch unausgebreiteten Wäschestücks vorzugsweise etwa gleich groß sind, kann die Länge des Wäschestücks vor dem Spreizen desselben mit verhältnismäßig großer Genauigkeit ermittelt werden. Die Messung kann beispielsweise erfolgen an der Stelle des größten Durchhangs in der Mitte des voraneilenden Querrands bis zur Stelle des größten, vorzugweise mittigen Durchhangs des anderen, nacheilenden Querrands. Anhand der gemessenen Länge des Wäschestücks wird dann aus der Datenbank die dazugehörende Breite des hinsichtlich der Länge gemessenen Wäschestücks ermittelt, insbesondere herausgesucht. Anhand dieser Breite wird dann später das Wäschestück in der Spreizeinrichtung gezielt ausgebreitet, insbesondere der Durchhang des oberen Querrands des Wäschestücks gezielt beseitigt oder zumindest annähernd beseitigt.An advantageous development of the method provides that the length of the item of laundry is determined by the at least one detection means when the item of laundry is held by the holding means with sagging transverse edges. Since the sagging of the two adjacent transverse edges of the item of laundry which has not yet been spread out are preferably approximately the same size, the length of the item of laundry can be determined with relatively great accuracy before it is spread apart. The measurement can be made, for example, from the point of greatest sag in the middle of the leading transverse edge to the point of greatest, preferably central, sag of the other, trailing transverse edge. Based on the measured length of the item of laundry, the associated width of the item of laundry measured in terms of length is then determined, in particular sought out, from the database. Based on this width, the item of laundry is later spread out in a targeted manner in the spreading device, in particular the sagging of the upper transverse edge of the item of laundry is specifically eliminated or at least approximately eliminated.

Eine Vorrichtung zur Lösung der eingangs genannten Aufgabe weist die Merkmale des Anspruchs 7 auf. Bei dieser Vorrichtung ist es vorgesehen, das wenigstens eine Detektionsmittel den vor der Spreizeinrichtung angeordneten Haltemitteln zuzuordnen. Dadurch kann die Vermessung des jeweiligen Wäschestücks schon vor der Spreizeinrichtung erfolgen. Die Vermessung braucht dadurch nicht mehr beim Spreizen des Wäschestücks zu erfolgen. Dadurch kann das Ausbreiten des Wäschestücks und Ausstrecken des vorderen Querrands desselben von der Spreizeinrichtung schneller erfolgen, weil die Spreizklammern die Ecken des vorderen Querrands sogleich nach der Übergabe bzw. Übernahme des Wäschestücks gezielt gesteuert auseinanderfahren können.A device for solving the problem mentioned at the outset has the features of claim 7 . In this device, provision is made for the at least one detection means to be assigned to the holding means arranged in front of the spreading device. As a result, the respective item of laundry can already be measured before the spreading device. As a result, the measurement no longer needs to be carried out when the item of laundry is being spread apart. This allows the item of laundry to be spread out and the front transverse edge to be stretched out faster by the spreading device because the expanding clamps can move the corners of the front transverse edge apart in a controlled manner immediately after the item of laundry has been handed over or taken over.

Bei einer bevorzugten Ausgestaltung der Vorrichtung ist es vorgesehen, die Haltemittel als gegenüberliegenden Längsrändern und/oder Ecken bzw. Eckbereichen des Wäschestücks zugeordnete Eckenfinder auszubilden. Die Eckenfinder transportieren das jeweilige Wäschestück an den Längsrändern ausgehend von den benachbarten Ecken des voraneilenden Querrands bis zu den benachbarten Ecken des gegenüberliegenden, nachfolgenden Querrands des Wäschestücks. Während dieses Weitertransports des Wäschestücks kann die Länge desselben zuverlässig ermittelt werden. Die Längenmessung kann dadurch kontinuierlich bzw. dynamisch erfolgen, so dass die Taktzeit hierdurch nicht vergrößert wird, weil die Messung keinen Stillstand des Wäschestücks erfordert.In a preferred embodiment of the device, provision is made for the holding means to be in the form of corner finders assigned to opposite longitudinal edges and/or corners or corner regions of the item of laundry. The corner finders transport the respective item of laundry along the longitudinal edges, starting from the adjacent corners of the leading transverse edge to the adjacent corners of the opposite, subsequent transverse edge of the item of laundry. The length of the item of laundry can be reliably determined during this onward transport of the item of laundry. The length measurement can thus be carried out continuously or dynamically, so that the cycle time is not increased as a result, because the measurement does not require the item of laundry to be stationary.

Bei einer vorteilhaften Ausgestaltung der Vorrichtung ist es vorgesehen, das mindestens eine Detektionsmittel zwischen den gegenüberliegenden Längsrändern und/oder Eckbereichen des Wäschestücks zugeordneten Eckenfindern anzuordnen. Das geschieht vorzugsweise derart, dass eine Messachse des mindestens einen Detektionsmittels quer zur Ebene der Fläche des Wäschestücks gerichtet die durchhängenden Querränder, vorzugsweise an ihren tiefsten Stellen, schneidet und das Vorbeilaufen des jeweiligen Querrands detektiert. Die tiefsten Stellen der Durchhänge der aufeinanderfolgend am Detektionsmittel vorbeilaufenden Querränder des jeweiligen Wäschestücks bilden definierte Messstellen, die eine einfache, berührungslose, aber präzise Messung der Länge des Wäschestücks während ihres Weitertransports von den Haltemitteln zulassen.In an advantageous embodiment of the device, provision is made for the at least one detection means to be arranged between corner finders assigned to the opposite longitudinal edges and/or corner regions of the item of laundry. This is preferably done in such a way that a measuring axis of the at least one detection means, directed transversely to the plane of the surface of the item of laundry, intersects the sagging transverse edges, preferably at their deepest points, and detects the passage of the respective transverse edge. The deepest points of the sagging of the transverse edges of the respective item of laundry successively running past the detection means form defined measuring points which allow a simple, non-contact but precise measurement of the length of the item of laundry while it is being transported further by the holding means.

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:

Fig. 1
eine perspektivische Gesamtansicht einer als Eingabemaschine ausgebildeten Vorrichtung,
Fig. 2
eine Draufsicht auf die Vorrichtung der Fig. 1,
Fig. 3
eine Seitenansicht einer Beladestation der Vorrichtung der Fig. 1 und 2 mit einem Wäschestück,
Fig. 4
eine Rückansicht (mit Blickrichtung gemäß dem Pfeil IV in der Fig. 3) der Beladestation der Fig. 3,
Fig. 5
eine Seitenansicht der Beladestation analog zur Fig. 3,
Fig. 6
eine Rückansicht (mit Blickrichtung gemäß dem Pfeil VI in der Fig. 5) der Beladestation der Fig. 5,
Fig. 7
eine Seitenansicht der Beladestation analog zu den Fig. 3 und 5, und
Fig. 8
eine Rückansicht (mit Blickrichtung gemäß dem Pfeil VIII in der Fig. 7) der Beladestation der Fig. 7.
A preferred embodiment of the invention is explained in more detail below with reference to the drawing. In this show:
1
a perspective overall view of a device designed as an input machine,
2
a top view of the device 1 ,
3
a side view of a loading station of the device 1 and 2 with a piece of laundry
4
a rear view (looking in the direction of arrow IV in Fig 3 ) of the loading station 3 ,
figure 5
a side view of the loading station analogous to 3 ,
6
a rear view (looking in the direction of arrow VI in Fig figure 5 ) of the loading station figure 5 ,
7
a side view of the loading station analogous to the 3 and 5 , and
8
a rear view (looking in the direction of arrow VIII in Fig 7 ) of the loading station 7 .

Die Figuren zeigen eine Vorrichtung, die als Eingabemaschine ausgebildet ist. In den Fig. 1 und 2 ist die Eingabemaschine vollständig dargestellt. Die Eingabemaschine dient dazu, jeweils ein einzelnes, nur in den Fig. 3 bis 8 dargestelltes Wäschestück 10, und zwar vor allem Flachwäschestück wie Bettlaken, Bettbezug, Kissenbezug, Handtuch, Tischdecke oder Ähnliches, in Zuführrichtung 11 einer in den Figuren nicht gezeigten Mangel zuzuführen. Die Vorrichtung kann aber auch dazu dienen, Wäschestücke 10 anderen Wäschebehandlungseinrichtungen zuzuführen, beispielsweise Faltmaschinen.The figures show a device that is designed as an input machine. In the 1 and 2 the input machine is shown in full. The input machine is used to each a single, only in the Figures 3 to 8 illustrated item of laundry 10, especially flat items of laundry such as sheets, duvet covers, pillowcases, towels, tablecloths or the like, in the feed direction 11 to a mangle, not shown in the figures. However, the device can also be used to supply items of laundry 10 to other laundry treatment devices, for example folding machines.

Die Wäschestücke 10 werden von der als Eingabemaschine ausgebildeten Vorrichtung vor dem Zuführen zu einer nachfolgenden Wäschebehandlungseinrichtung ausgebreitet. Im Fachjargon spricht man auch vom Ausstrecken oder Spreizen der Wäschestücke 10.The items of laundry 10 are spread out by the device designed as an input machine before being fed to a downstream laundry treatment device. In technical jargon, one also speaks of stretching out or spreading the items of laundry 10.

Die hier dargestellte Vorrichtung bzw. Eingabemaschine verfügt über drei gleich ausgebildete Beladestationen 12. Die Beladestationen 12 sind mit gleichem Abstand zueinander in einer quer zur Zuführrichtung 11 verlaufenden Reihe der Vorderseite der Eingabemaschine zugeordnet. Die Erfindung eignet sich auch für Eingabemaschinen mit einer größeren oder kleineren Anzahl von Beladestationen 12, und zwar auch für Eingabemaschinen mit nur einer einzigen Beladestation 12. Vor allem eignet sich die Erfindung auch für Eingabemaschinen mit anderen Beladestationen 12. Die Erfindung soll folglich nicht auf die in den Figuren gezeigte Vorrichtung und insbesondere nicht auf die hier gezeigten Beladestationen 12 beschränkt sein.The device or input machine shown here has three identically designed loading stations 12. The loading stations 12 are assigned to the front side of the input machine at the same distance from one another in a row running transversely to the feed direction 11. The invention is also suitable for input machines with a larger or smaller number of loading stations 12, and also for input machines with only a single loading station 12. Above all, the invention is also suitable for input machines with other loading stations 12. The invention is therefore not intended to device shown in the figures and in particular not be limited to the loading stations 12 shown here.

Jede Beladestation 12 verfügt über einen Beladeförderer 18, der das Wäschestück 10 in Zuführrichtung 11 transportiert. Jeder der gleich ausgebildeten Beladeförderer 18 der Beladestationen 12 verfügt über zwei schmale, vorzugsweise gleich breite, Gurtförderer 28, 29 mit jeweils einem umlaufenden Fördergurt. Die Gurtförderer 28 und 29 sind übereinander angeordnet zur Bildung eines Sandwichförderers, wobei der obere Gurtförderer 28 kürzer ist als der untere Gurtförderer 29 zur Bildung eines freiliegenden Auflegebereichs 22 auf dem vom kürzeren oberen Gurtförderer 28 freigelassenen vorderen Bereich eines Obertrums des längeren unteren Gurtförderers 29.Each loading station 12 has a loading conveyor 18 which transports the item of laundry 10 in the feed direction 11 . Each of the identically designed loading conveyors 18 of the loading stations 12 has two narrow, preferably equally wide, belt conveyors 28, 29, each with a circulating conveyor belt. The belt conveyors 28 and 29 are arranged one above the other to form a sandwich conveyor, with the upper belt conveyor 28 being shorter than the lower belt conveyor 29 to form an exposed laying area 22 on the front area of an upper run of the longer lower belt conveyor 29 left free by the shorter upper belt conveyor 28.

Dem in Zuführrichtung 11 gesehen hinteren Ende jedes Beladeförderers 18 sind zwei Eckenfinder 19 zugeordnet. Die Eckenfinder 19 ergreifen zunächst benachbarte Ecken 16 des späteren hinteren Querrands 17 des Wäschestücks 10 vom Beladeförderer 18. Die Eckenfinder 19 sind dem hinteren Ende des unteren Gurtförderers 29 zugeordnet. Die Eckenfinder 19 sind außerdem auf beiden Seiten neben dem jeweiligen Beladeförderer 18 angeordnet, vorzugsweise dem hinteren Ende des unteren Gurtförderers 29.Two corner finders 19 are assigned to the rear end of each loading conveyor 18 as seen in the feed direction 11 . The corner finders 19 first grasp adjacent corners 16 of the later rear transverse edge 17 of the laundry item 10 from the loading conveyor 18. The corner finders 19 are assigned to the rear end of the lower belt conveyor 29. The corner finders 19 are also arranged on both sides next to the respective loading conveyor 18, preferably the rear end of the lower belt conveyor 29.

Jeder der vorzugsweise gleich ausgebildeten, aber durch Anordnung an gegenüberliegenden Seiten des hinteren Endes des unteren Gurtförderers 29 spiegelbildlich orientierten Eckenfinder 19 verfügt über zwei Walzen 30, 31, die zusammen ein Walzenpaar mit parallelen Längsmittelachsen bzw. Drehachsen bilden. Zwischen den Walzen 30 und 31 jedes Walzenpaars ist ein Walzenspalt 23 gebildet. Zumindest eine Walze 30 bzw. 31 jedes Eckenfinders 19 ist drehend antreibbar. Im gezeigten Ausführungsbeispiel ist die Walze 31 jedes Eckenfinders 19 drehend antreibbar. Die auf gegenüberliegenden Seiten des Beladeförderers 18 und/oder Gurtförderers 29 liegenden antreibbaren Walzen 31 jedes Eckenfinders 19 sind im gezeigten Ausführungsbeispiel unabhängig separat antreibbar.Each of the corner finders 19, which are preferably of the same design but are mirror-inverted by being arranged on opposite sides of the rear end of the lower belt conveyor 29, has two rollers 30, 31 which together form a pair of rollers with parallel longitudinal center axes or axes of rotation. A nip 23 is formed between the rollers 30 and 31 of each roller pair. At least one roller 30 or 31 of each corner finder 19 can be driven in rotation. In the exemplary embodiment shown, the roller 31 of each corner finder 19 can be driven in rotation. The drivable rollers 31 of each corner finder 19 lying on opposite sides of the loading conveyor 18 and/or belt conveyor 29 can be driven separately in the exemplary embodiment shown.

Im gezeigten Ausführungsbeispiel ist der Walze 31 jedes Eckenfinders 19 ein eigener Antrieb zugeordnet. Der Antrieb ist als Riementrieb mit einem Zahnriemen 38 und einer Zahnriemenscheibe 39 seitlich neben jeder Walze 31 ausgebildet. Alternativ kann der Antrieb aber auch ein Direktantrieb sein. Als Antriebsmotor dient vorzugsweise ein elektrischer Servomotor, der eine Wegmesseinrichtung aufweist, insbesondere eine Drehwinkelmesseinrichtung. Daraus lässt sich der am Umfang der Walze 31 zurückgelegte Weg ermitteln. Auch lässt sich aus dem gemeinsamen Drehwinkel errechnen, welchen Weg der jeweilige Längsrand 34 des Wäschestücks 10 beim Hindurchlaufen durch die Walzen 30 und 31 des jeweiligen Eckfinders 19 zurückgelegt hat. Alternativ ist es denkbar, den Wegaufnehmer jedes Eckenfinders 19 direkt der Walze 31 und gegebenenfalls auch der Walze 30 des jeweiligen Eckenfinders 19 zuzuordnen.In the exemplary embodiment shown, the roller 31 of each corner finder 19 is assigned its own drive. The drive is designed as a belt drive with a toothed belt 38 and a toothed belt pulley 39 on the side next to each roller 31 . Alternatively, the drive can also be a direct drive. An electric servo motor, which has a path measuring device, in particular a rotary angle measuring device, is preferably used as the drive motor. The path covered on the circumference of the roller 31 can be determined from this. The common angle of rotation can also be used to calculate the distance covered by the respective longitudinal edge 34 of the item of laundry 10 when passing through the rollers 30 and 31 of the respective corner finder 19 . Alternatively, it is conceivable to assign the displacement sensor of each corner finder 19 directly to the roller 31 and possibly also to the roller 30 of the respective corner finder 19 .

Auf die Eckenfinder 19 jeder Beladestation 12 folgt ein Transferklammerpaar 20 mit zwei Transferklammern 21. Das Transferklammerpaar 20 der jeweiligen Beladestation 12 übernimmt benachbarte Eckbereiche, vorzugsweise Ecken 16, des noch nicht ausgestreckten (durchhängenden) Querrands 17 des Wäschestücks 10 von den Eckenfindern 19 und transportiert es zu zwei Spreizklammern 15 eines Spreizklammerpaars der Spreizeinrichtung 13. Die Spreizklammern 15 übernehmen die Ecken 16 des Querrands 17 des Wäschestücks 10 dann von den Transferklammern 21 des Transferklammerpaars 20 bzw. es werden von den Transferklammern 21 des Transferklammerpaars 20 die den Querrand 17 des Wäschestücks 10 begrenzenden Ecken 16 des noch unausgebreiteten Wäschestücks 10 bei mit noch durchhängendem Querrand 17 an die Spreizklammern 15 übergeben.The corner finder 19 of each loading station 12 is followed by a pair of transfer clamps 20 with two transfer clamps 21. The pair of transfer clamps 20 of the respective loading station 12 takes over adjacent corner regions, preferably corners 16, of the not yet extended (sagging) transverse edge 17 of the item of laundry 10 from the corner finders 19 and transports it to two spreading clamps 15 of a pair of spreading clamps of the spreading device 13. The spreading clamps 15 then take over the corners 16 of the transverse edge 17 of the item of laundry 10 from the transfer clamps 21 of the pair of transfer clamps 20 or, from the transfer clamps 21 of the pair of transfer clamps 20, they delimit the transverse edge 17 of the item of laundry 10 Corners 16 of the still unspread laundry item 10 passed to the spreading clamps 15 with the transverse edge 17 still sagging.

Ein Transferklammerpaar 20 ist zwischen den Eckenfindern 19 jeder Beladestation 11 und der Spreizeinrichtung 13 vorgesehen. Jeweils eine Transferklammer 21 eines Transferklammerpaars 20 ist dabei jedem der beiden gegenüberliegenden Eckenfindern 19 jeder Beladestation 12 zugeordnet. Dazu sind die beiden Transferklammern 21 jedes Transferklammerpaars 20 zusammengefasst. Das jeweilige Transferklammerpaar 21 bildet dadurch eine Doppelklammer für jeweils eine der gegenüberliegenden Ecken 16 des Querrands 17, vorzugsweise vorderen Querrands 17, des Wäschestücks 10.A pair of transfer clamps 20 is provided between the corner finders 19 of each loading station 11 and the spreader 13 . In each case one transfer clamp 21 of a transfer clamp pair 20 is assigned to each of the two opposite corner finders 19 of each loading station 12 . For this purpose, the two transfer clamps 21 of each transfer clamp pair 20 are combined. The respective pair of transfer clamps 21 thus forms a double clamp for one of the opposite corners 16 of the transverse edge 17, preferably the front transverse edge 17, of the item of laundry 10.

Das Transferklammerpaar 20 jeder Beladestation 12 ist auf einen Laufwagen an einer Schiene 24 verfahrbar. Die Schiene 24 der mittleren Beladestation 12 verläuft bei der gezeigten Vorrichtung geradlinig in Zuführrichtung 11 längs der Mitte der Eingabemaschine und des Zuführförderers 17. Diese Schiene 24 verläuft in Zuführrichtung aufwärtsgerichtet. Von den äußeren Beladestationen 12 gehen längere, schräg aufwärts und in Richtung zur Spreizeinrichtung 13 verlaufende Schienen 24 aus. Beide Schienen 24 der gegenüberliegenden äußeren Beladestation 12 sind gleich lang, aber unterschiedlich gerichtet, so dass ihre in Zuführrichtung gesehen hinteren Enden konvergierend zur Mitte der Eingabemaschine gerichtet sind, aber vor der Mitte enden, und zwar genauso wie die der mittleren Beladestation 12 zugeordnete Schiene 24. Die Enden der Schienen 24 aller Transferklammerpaare 20 liegen auf einer gemeinsamen horizontalen (gedachten) Linie, die parallel zu der mindestens einen Schiene 24 der Spreizeinrichtung 13 verläuft, aber mit Abstand davor und/oder darüber. Die Längen der Schienen 24 sowie die Positionierungen ihrer zur Spreizeinrichtung 13 weisenden Enden sind so getroffen, dass die Spreizklammern 15 kollisionsfrei an den Transferklammern 21 vorbeilaufen können.The pair of transfer clamps 20 of each loading station 12 can be moved onto a carriage on a rail 24 . In the device shown, the rail 24 of the central loading station 12 runs in a straight line in the feed direction 11 along the center of the input machine and the feed conveyor 17. This rail 24 runs upwards in the feed direction. Longer rails 24 running obliquely upwards and in the direction of the spreading device 13 extend from the outer loading stations 12 . Both rails 24 of the opposite outer loading station 12 are of the same length, but directed differently, so that their rear ends seen in the feed direction converge to the The ends of the rails 24 of all pairs of transfer clamps 20 lie on a common horizontal (imaginary) line that is parallel to the at least one rail 24 of the spreading device 13 runs, but at a distance in front of it and/or above it. The lengths of the rails 24 and the positioning of their ends pointing towards the spreading device 13 are such that the spreading clamps 15 can run past the transfer clamps 21 without colliding.

Jeder Beladestation 12 ist ein Detektionsmittel zugeordnet, bei dem es sich im gezeigten Ausführungsbeispiel um einen Sensor 27 handelt. Gegebenenfalls kann das Detektionsmittel auch über mehrere Sensoren 27 verfügen. Den Beladestationen 12 können weitere, in den Figuren nicht gezeigte Detektionsmittel zugeordnet sein.Each loading station 12 is assigned a detection means, which is a sensor 27 in the exemplary embodiment shown. If necessary, the detection means can also have several sensors 27 . Additional detection means, not shown in the figures, can be assigned to the loading stations 12 .

Der die Detektionseinrichtung bildende Sensor 27 ist dem oberen Ende des jeweiligen Beladeförderers 18 zugeordnet. Diese Zuordnung ist derart getroffen, dass der Sensor 27 in Durchlaufrichtung 32 des jeweiligen Wäschestücks 10 durch den Walzenspalt 23 jedes Eckenfinders 19, also der beiden Walzen 30 und 31, auf die Eckenfinder 19 und ihre Walzen 30 und 31 folgt. Außerdem ist der Sensor 27 derart hinter den Eckenfindern 19 angeordnet, dass er sich mittig zwischen denselben befindet und vorzugsweise auf einer vertikalen Längsmittelebene der Gurtförderer 28 und 29 der jeweiligen Beladestation 12 liegt.The sensor 27 forming the detection device is assigned to the upper end of the respective loading conveyor 18 . This assignment is made such that the sensor 27 follows the corner finder 19 and its rollers 30 and 31 in the direction of passage 32 of the respective item of laundry 10 through the nip 23 of each corner finder 19, i.e. the two rollers 30 and 31. In addition, the sensor 27 is arranged behind the corner finders 19 in such a way that it is located centrally between them and preferably lies on a vertical longitudinal center plane of the belt conveyors 28 and 29 of the respective loading station 12 .

Weiterhin ist die Zuordnung des Sensors 27 zu den Eckenfindern 19 derart getroffen, dass ein Messstrahl 26 des Sensors 27 parallel unterhalb einer gedachten Ebene durch die Drehachsen der Walzen 30 und 31 beider Eckenfinder 19 verläuft. Dabei ist der Messstrahl 26 quer zu den mittigen Drehachsen der Walzen 30 und 31 gerichtet. Der Messstrahl 26 verläuft aber nicht durch die Drehachsen der Walzen 30 und 31 der Eckenfinder 19, sondern in Durchlaufrichtung 32 des Wäschestücks 10 durch die Beladestation 12 und die Eckenfinder 19 dahinter bzw. darunter (Fig. 3).Furthermore, the sensor 27 is assigned to the corner finders 19 in such a way that a measuring beam 26 of the sensor 27 runs parallel below an imaginary plane through the axes of rotation of the rollers 30 and 31 of both corner finders 19 . In this case, the measuring beam 26 is directed transversely to the central axes of rotation of the rollers 30 and 31 . However, the measuring beam 26 does not run through the axes of rotation of the rollers 30 and 31 of the corner finders 19, but in the direction of passage 32 of the item of laundry 10 through the loading station 12 and the corner finders 19 behind or below ( 3 ).

Im gezeigten Ausführungsbeispiel ist der Sensor 27 Teil einer Lichtschranke. Dazu ist dem Sensor 27 ein davon beabstandeter Reflektor 33 zugeordnet. Statt des Reflektors 33 kann auch ein Spiegel oder ein Empfänger vorgesehen sein. Der Reflektor 33 oder Spiegel bzw. Empfänger liegt auf einer dem Walzenspalt 23 weggerichteten Seite der Walze 31 jedes Eckenfinders 19. Demgegenüber befindet sich der Sensor 27 auf einer dem Walzenspalt 23 weggerichteten Seite der anderen Walze 30 jedes Eckenfinders 19.In the exemplary embodiment shown, the sensor 27 is part of a light barrier. For this purpose, the sensor 27 is assigned a reflector 33 spaced therefrom. Instead of the reflector 33, a mirror or a receiver can also be provided. The reflector 33 or mirror or receiver is located on a side of the roller 31 of each corner finder 19 that faces away from the nip 23. In contrast, the sensor 27 is located on a side of the other roller 30 of each corner finder 19 that faces away from the nip 23.

Dadurch erstreckt sich der Messstrahl 26 quer zu einer Ebene, in der sich das Wäschestück 10 nach dem in Durchlaufrichtung 32 erfolgten Hindurchlaufen durch die Walzenspalte 23 der Eckenfinder 19 befindet. Der Sensor 27 kann so das Vorbeilaufen des zunächst vorderen Querrands 17 und danach des hinteren Querrands 17 detektieren, wonach dieser hintere Querrand 17 zum vorderen Querrand 17 wird, der anschließend von der Spreizeinrichtung 13 gestreckt wird zur Beseitigung oder zumindest weitestgehenden Beseitigung seines Durchhangs 35.As a result, the measuring beam 26 extends transversely to a plane in which the item of laundry 10 is located after it has passed through the roller gaps 23 of the corner finders 19 in the throughput direction 32 . The sensor 27 can thus detect the passage of the first front transverse edge 17 and then the rear transverse edge 17, after which this rear transverse edge 17 becomes the front transverse edge 17, which is then stretched by the spreading device 13 in order to eliminate or at least largely eliminate its sagging 35.

Bevorzugt handelt es sich beim Sensor 27 um einen solchen, der ein analoges Messsignal bzw. einen analogen Messwert ermittelt. Der jeweilige Sensor 27 ist weiterhin so ausgebildet, dass er sehr rasch die Messergebnisse liefert, insbesondere zeitlich dicht aufeinanderfolgende Messsignale. Dazu ist der analoge Messsignale liefernde Sensor 27 so ausgebildet, dass er Messsignale, insbesondere Längen- und/oder Abstandsmesswerte, mit einer Ausgangsmessfrequenz von unter 20 ms liefert.The sensor 27 is preferably one that determines an analog measurement signal or an analog measured value. The respective sensor 27 is also designed in such a way that it supplies the measurement results very quickly, in particular measurement signals that follow closely in time. For this purpose, the sensor 27 supplying analog measurement signals is designed in such a way that it supplies measurement signals, in particular length and/or distance measurement values, with an output measurement frequency of less than 20 ms.

Nachfolgend wird das erfindungsgemäße Verfahren unter Bezugnahme auf die zuvor beschriebene Vorrichtung bzw. Eingabemaschine und insbesondere die Fig. 3 bis 8 erläutert:
Jeweils ein einzelnes Wäschestück 10 wird manuell auf den Auflegebereich 22 des Beladeförderers 18 einer jeweiligen Beladestation 12 aufgelegt. Vom Beladeförderer 18 wird das Wäschestück 10 dann zu den beiden gegenüberliegenden Seiten des oberen bzw. hinteren Endes des Beladeförderers 18 und/oder den diesem zugeordneten Eckenfindern 19 transportiert.
The method according to the invention is described below with reference to the device or input machine described above and in particular to the Figures 3 to 8 explained:
A single item of laundry 10 is placed manually on the placement area 22 of the loading conveyor 18 of a respective loading station 12 . The item of laundry 10 is then transported by the loading conveyor 18 to the two opposite sides of the upper or rear end of the loading conveyor 18 and/or to the corner finders 19 assigned to it.

Das jeweilige Wäschestück 10 wird mit voraneilendem Querrand 17 dem Beladeförderer 18 zugeführt. Jeder Eckenfinder 19 übernimmt dann zunächst eine Ecke 16 bzw. einen Eckbereich des voraneilenden Querrands 17 des Wäschestücks 10. Dabei gelangen gegenüberliegende Ecken 16 des voraneilenden Querrands 17 in den Walzenspalt 23 des jeweils einen Eckenfinders 19 auf gegenüberliegenden Seiten des Beladeförderers 18. Infolge der sich paarweise gegensinnig drehenden Walzen 30 und 31 jedes Eckenfinders 19 wird nun das Wäschestück 10 an seinen gegenüberliegenden Längsrändern 34 durch die Eckenfinder 19 transportiert. Dabei befindet sich jeder Längsrand 34 im Walzenspalt 23 eines Eckenfinders 19. Der Hindurchtransport des Wäschestücks 10 durch die Eckenfinder 19 wird gestoppt, sobald gegenüberliegende Ecken 16 bzw. Eckbereiche des nachfolgenden Querrands 17 in die Eckenfinder 19 gelangen bzw. gelangt sind (Fig. 7 und 8). Dieser Querrand 17 wird dadurch zum auszustreckenden vorderen Querrand 17. Bei gleichzeitig in den Walzenspalt 23 jedes Eckenfinders 19 einlaufenden Ecken 16 des Querrands 17 werden beide Eckenfinder 19 gleichzeitig gestoppt. Dann werden auch die Antriebe der Walzen 30, 31 beider Eckenfinder 19 zeitgleich gestoppt. Es kann aber auch vorkommen, dass die gegenüberliegenden Ecken 16 des nacheilenden Querrands 17 zu unterschiedlichen Zeiten in die Walzenspalte 23 der Eckenfinder 19 einlaufen. Dann wird der Antrieb des Walzenpaars eines Eckenfinders 19 entsprechend später gestoppt als der Antrieb des Walzenpaars desjenigen Eckenfinders 19, der die voraneilende Ecke 16 hält.The respective item of laundry 10 is fed to the loading conveyor 18 with the transverse edge 17 leading the way. Each corner finder 19 then first takes over a corner 16 or a corner area of the leading transverse edge 17 of the laundry item 10. Opposite corners 16 of the leading transverse edge 17 reach the roller gap 23 of each corner finder 19 on opposite sides of the loading conveyor 18. As a result of the pairs Counter-rotating rollers 30 and 31 of each corner finder 19 now transport the item of laundry 10 on its opposite longitudinal edges 34 through the corner finder 19 . Each longitudinal edge 34 is located in the nip 23 of a corner finder 19. The transport of the item of laundry 10 through the corner finder 19 is stopped as soon as opposite corners 16 or corner regions of the subsequent transverse edge 17 reach or have reached the corner finder 19 ( 7 and 8th ). This transverse edge 17 thus becomes the front transverse edge 17 to be stretched out. When corners 16 of the transverse edge 17 enter the nip 23 of each corner finder 19 simultaneously, both corner finders 19 are stopped simultaneously. Then the drives of the rollers 30, 31 of both corner finders 19 are stopped at the same time. However, it can also happen that the opposite corners 16 of the trailing transverse edge 17 enter the nips 23 of the corner finders 19 at different times. Then the driving of the pair of rollers of a corner finder 19 is stopped correspondingly later than the driving of the pair of rollers of that corner finder 19 holding the leading corner 16 .

Sobald die Ecken 16 des nacheilenden Querrands 17 des Wäschestücks 10 sich in den Eckenfindern 19, nämlich den Walzenspalten 23 derselben, befinden, wird der nacheilende Querrand 17 zum von der Spreizeinrichtung 13 im Durchhang mindestens größtenteils zu verringernde vordere Querrand 17 des Wäschestücks 10. Mit diesem nunmehr vorderen Querrand 17 voran läuft dann das von der Spreizeinrichtung 13 ausgebreitete bzw. ausgestreckte Wäschestück 10 in die Mangel oder eine sonstige Wäschebehandlungsmaschine ein.As soon as the corners 16 of the trailing transverse edge 17 of the item of laundry 10 are in the corner finders 19, namely the roller gaps 23 of the same, the trailing transverse edge 17 becomes the front transverse edge 17 of the item of laundry 10 whose sag is to be at least largely reduced by the spreading device 13. With this Now leading the front transverse edge 17, the item of laundry 10 spread out or stretched out by the spreading device 13 runs into the mangle or another laundry treatment machine.

Weil die beiden Eckenfinder 19 auf beiden Seiten neben dem Beladeförderer 18 direkt neben den Gurtförderern 28, 29 desselben angeordnet sind, weisen die Querränder 17 des Wäschestücks 10 beim Hindurchtransportieren desselben an den gegenüberliegenden Längsrändern 34 durch die Eckenfinder 19 einen noch relativ großen Durchhang 35 auf. Das Wäschestück 10 ist dadurch noch nicht ausgebreitet und noch nicht zur Übergabe an die Mangel oder eine sonstige Wäschebehandlungsmaschine bereit.Because the two corner finders 19 are arranged on both sides next to the loading conveyor 18 directly next to the belt conveyors 28, 29 thereof, the transverse edges 17 of the item of laundry 10 still have a relatively large sag 35 at the opposite longitudinal edges 34 through the corner finders 19 when the same is being transported. As a result, the item of laundry 10 has not yet been spread out and is not yet ready to be transferred to the mangle or another laundry treatment machine.

Erfindungsgemäß erfolgt beim Hindurchlaufen des Wäschestücks 10 mit gegenüberliegenden Längsrändern 34 durch die gegenüberliegenden Längsrändern 34 zugeordneten Eckenfinder 19 eine Längenmessung des Wäschestücks 10. Diese Längenmessung erfolgt mit dem Sensor 27 und dem damit zusammenwirkenden Reflektor 33 oder alternativ einem Spiegel, einem Empfänger oder einem sonstigen Detektionsmittel. Das Detektionsmittel misst die tiefste Stelle 36, 37 des Durchhangs 35 der beiden aufeinanderfolgenden Querränder 17 des Wäschestücks 10 berührungslos und nacheinander.According to the invention, when the item of laundry 10 with opposite longitudinal edges 34 passes through the corner finders 19 assigned to the opposite longitudinal edges 34, a length measurement of the item of laundry 10 is carried out. This length measurement is carried out with the sensor 27 and the reflector 33 interacting therewith or alternatively with a mirror, a receiver or another detection means. The detection means measures the deepest point 36, 37 of the sag 35 of the two successive transverse edges 17 of the item of laundry 10 without contact and one after the other.

Der vorauseilende Querrand 17 verlässt beim Weitertransport der Durchlaufrichtung 32 den Einflussbereich der Eckenfinder 19 mit nach außen gewölbtem, konkaven Querrand 17. Sobald eine tiefste Stelle 37 dieses voraneilenden und nach außen gewölbten Querrands 17 den Messstrahl 26 des Sensors 27 passiert hat, wird die Längenmessung des Wäschestücks 10 gestartet, indem das Wäschestück 10 den Messstrahl 26 unterbricht (Fig. 5 und 6). Wenn die benachbarten Längsränder 34 des Wäschestücks 10 größtenteils durch die Eckenfinder 19 hindurchgelaufen sind, wird vom an der tiefste Stelle 36 des nach innen gewölbten, durchhängenden nacheilenden Querrand 17 der Messstrahl 26 des Sensors 27 wieder freigeben (Fig. 7 und 8). Zu diesem Zeitpunkt wird die Längenmessung des Wäschestücks 10 gestoppt.The leading transverse edge 17 leaves the area of influence of the corner finder 19 with the outwardly curved, concave transverse edge 17 as it is transported further in the throughput direction 32. As soon as a deepest point 37 of this leading and outwardly curved transverse edge 17 has passed the measuring beam 26 of the sensor 27, the length measurement of the Laundry item 10 started by the laundry item 10 interrupts the measuring beam 26 ( figure 5 and 6 ). When the adjacent longitudinal edges 34 of the item of laundry 10 have largely passed through the corner finders 19, the measuring beam 26 of the sensor 27 is released again from the deepest point 36 of the inwardly curved, sagging trailing transverse edge 17 ( 7 and 8th ). At this time, the length measurement of the laundry item 10 is stopped.

Die Ermittlung der Länge des Wäschestücks 10 kann durch Messung derjenigen Zeit bzw. Zeitspanne erfolgen, die von der Unterbrechung des Messstrahls 26 durch die tiefste Stelle 37 des voraneilenden Querrands 17 bis zur Freigabe des Messstrahls 26 durch die tiefste Stelle 36 des nacheilenden durchhängenden Querrands 17 vergeht. Aus der bekannten Umfangsgeschwindigkeit der Walzen 30, 31 des Walzenpaars jedes Eckenfinders 19 und der gemessenen Zeit kann so rechnerisch die Länge des Wäschestücks 10 ermittelt werden.The length of the item of laundry 10 can be determined by measuring the time or period of time that elapses from the interruption of the measuring beam 26 by the deepest point 37 of the leading transverse edge 17 to the release of the measuring beam 26 by the deepest point 36 of the trailing sagging transverse edge 17 . From the known circumferential speed of the rollers 30, 31 of the pair of rollers of each corner finder 19 and the measured time, the length of the item of laundry 10 can be determined by calculation.

Alternativ kann die Länge des Wäschestücks 10 auch durch eine direkte Wegmessung ermittelt werden. Dazu ist der angetriebenen Walze 31 jedes Eckenfinders 19 oder gegebenenfalls auch der anderen Walze 30 jeweils ein Wegaufnehmer direkt oder indirekt zugeordnet. Die indirekte Zuordnung des Wegaufnehmers zur Walze 31 oder gegebenenfalls auch zur Walze 30 jedes Eckenfinders 19 erfolgt am Antrieb der betreffenden Walze 31 oder auch 30. Vorzugsweise ist ein zum Antrieb der jeweiligen Walze 31 oder 30 dienende Servomotor mit einem Wegaufnehmer versehen. Beim Wegaufnehmer handelt es sich bevorzugt um einen Drehwinkelaufnehmer. Aus dem Drehwinkel lässt sich aufgrund des Durchmessers der jeweiligen Walze 31 oder 30 in Verbindung mit gegebenenfalls einem Übersetzungsverhältnis des Antriebs der Weg ermitteln, den der Umfang der Walze 31 bzw. 30 während des Vorbeilaufens des voraneilenden Querrands 17 bis zum nacheilenden Querrand 17 am jeweiligen Messstrahl 26 zurückgelegt hat.Alternatively, the length of the item of laundry 10 can also be determined by a direct distance measurement. For this purpose, the driven roller 31 of each corner finder 19 or possibly also the other roller 30 is assigned a displacement sensor directly or indirectly. The indirect assignment of the displacement sensor to the roller 31 or possibly also to the roller 30 of each corner finder 19 takes place at the drive of the relevant roller 31 or 30. A servomotor used to drive the respective roller 31 or 30 is preferably provided with a displacement sensor. The displacement pickup is preferably a rotation angle pickup. From the angle of rotation, based on the diameter of the respective roller 31 or 30 in conjunction with a transmission ratio of the drive, if applicable, the path that the circumference of the roller 31 or 30 travels while the leading transverse edge 17 to the trailing transverse edge 17 on the respective measuring beam can be determined 26 has covered.

Die Messung der Länge des Wäschestücks 10 erfolgt nach dem zuvor beschriebenen Verfahren während des Hindurchtransportierens des Wäschestücks 10 durch die Eckenfinder 19. Vorzugsweise erfolgt die Messung vor dem Stoppen des drehenden Antriebs der Walzen 30, 31 der Eckenfinder 19, also bevor die nun den vorderen Querrand 17 begrenzenden Ecken 16 in die Eckenfinder 19 eingelaufen sind. Die Längenmessung des Wäschestücks 10 ist somit abgeschlossen, bevor die Antriebe der Walzen 30, 31 der Eckenfinder 19 gestoppt werden, um die von den Eckenfindern 19 gefundenen gegenüberliegenden Ecken 16 des nun vorderen Querrands 17 an jeweils ein Transferklammerpaar 20 zu übergeben. Bevor das Transferklammerpaar 20 die Ecken 16 des noch durchhängenden vorderen Querrands 17 des jeweiligen Wäschestücks 10 an die Spreizklammern 15 der Spreizeinrichtung 13 übergeben, wird aus der ermittelten Länge des Wäschestücks 10 die Breite desselben bzw. die Länge des vorderen Querrands 17 ermittelt.The length of the item of laundry 10 is measured according to the method described above while the item of laundry 10 is being transported through the corner finder 19. The measurement is preferably carried out before the rotating drive of the rollers 30, 31 of the corner finder 19 is stopped, i.e. before the front transverse edge 17 delimiting corners 16 have run into the corner finder 19. The length measurement of the item of laundry 10 is thus completed before the drives of the rollers 30, 31 of the corner finders 19 are stopped in order to transfer the opposite corners 16 of the now front transverse edge 17 found by the corner finders 19 to a respective pair of transfer clamps 20. Before the pair of transfer clamps 20 press the corners 16 of the front transverse edge 17 of the respective item of laundry 10, which is still sagging, onto the spreading clamps 15 handed over to the spreading device 13, the width of the same or the length of the front transverse edge 17 is determined from the determined length of the laundry item 10.

Die Ermittlung der der Breite des Wäschestücks 10 entsprechenden Länge des vorderen Querrands 17 erfolgt anhand der vorher gemessenen Länge des Wäschestücks 10, indem aus einer Datenbank die zur gemessenen Länge gehörende Breite des jeweiligen Wäschestücks 10 ausgelesen wird. Dabei wird von der Erkenntnis ausgegangen, dass üblicherweise Wäschestücke 10 mit Standardmaßen verarbeitet werden. Demzufolge weist ein Wäschestück 10 einer bestimmten Länge eine damit korrespondierende, definierte Breite und somit Länge des quer zur Zuführrichtung 11 verlaufenden Querrands 17 auf. Die Datenbank bzw. Speicher gehören zur Vorrichtung und sind Bestandteil des Verfahrens. Sobald die Länge eines Wäschestücks 10 gemessen ist, wird unter Heranziehung dieser Länge aus der Datenbank die zu dieser gemessenen Länge gehörende Breite des Wäschestücks 10 ermittelt und abgefragt bzw. ausgelesen. Diese Breite kann dann zum nachfolgenden Ausbreiten des Wäschestücks 10 mit der Spreizeinrichtung 13 herangezogen werden.The length of the front transverse edge 17 corresponding to the width of the laundry item 10 is determined using the previously measured length of the laundry item 10 by reading out the width of the respective laundry item 10 associated with the measured length from a database. This is based on the knowledge that items of laundry 10 with standard dimensions are usually processed. Accordingly, an item of laundry 10 of a specific length has a corresponding, defined width and thus length of the transverse edge 17 running transversely to the feed direction 11 . The database or memory belong to the device and are part of the method. As soon as the length of an item of laundry 10 has been measured, the width of the item of laundry 10 associated with this measured length is determined and queried or read out using this length from the database. This width can then be used for the subsequent spreading of the item of laundry 10 with the spreading device 13 .

In der Datenbank sind anfänglich die Längen aller vorkommenden Wäschestücke 10 und die dazugehörenden Breiten bzw. Längen-Breiten-Verhältnisse abgespeichert. Sollte es vorkommen, dass eine Länge gemessen wird, die in der Datenbank nicht mit der dazugehörenden Breite abgelegt ist, kann das auf eine Fehlmessung hindeuten oder ein in einem Wäscheposten sind befindenden "fremdes" Wäschestück 10. Solche Wäschestücke 10 werden dann ausgesondert, also nicht der Spreizeinrichtung 13 zugeführt, und zwar insbesondere weil sie Wäschestücke 10, deren Breite nicht ermittelbar ist, nicht ausbreiten kann.The lengths of all items of laundry 10 present and the associated widths or length-to-width ratios are initially stored in the database. Should it happen that a length is measured that is not stored in the database with the associated width, this can indicate an incorrect measurement or an "alien" item of laundry 10 in a batch of laundry. Such items of laundry 10 are then sorted out, i.e. not supplied to the spreading device 13, in particular because it cannot spread out items of laundry 10 whose width cannot be determined.

Nachdem aus der Datenbank die zur gemessenen Länge gehörende Breite des Wäschestücks automatisch von der Steuerung entnommen worden ist, ist auch die Länge des von der Spreizeinrichtung 13 zu spreizenden vorderen Querrands 17 des Wäschestücks 10 bekannt. Die Länge des Querrands 17 entspricht nämlich der Breite des Wäschestücks 10. Anhand der ermittelten Länge des vorderen Querrands 17 wird das Wäschestück 10 nun von der Spreizeinrichtung 13 durch gezieltes Auseinanderfahren der beiden gegenüberliegenden Ecken 16 des Querrands 17 haltenden Spreizklammern 15 ausgebreitet und dabei der vordere Querrand 17 soweit gestreckt, dass sein Durchhang 35 beseitigt ist oder zumindest im Rahmen des Möglichen ohne eine Überdehnung des Querrands 17 beseitigt ist.After the width of the item of laundry belonging to the measured length has been automatically taken from the database by the controller, the length of the front transverse edge 17 of the item of laundry 10 to be spread by the spreading device 13 is also known. The length of the transverse edge 17 corresponds to the width of the item of laundry 10. Based on the determined length of the front transverse edge 17, the item of laundry 10 is now spread out by the spreading device 13 by deliberately moving apart the two opposite corners 16 of the transverse edge 17 holding spreading clamps 15 and thereby the front transverse edge 17 stretched to such an extent that its slack 35 is eliminated or at least eliminated as far as possible without overstretching the transverse edge 17 .

Denkbar ist es auch, dass das Auseinanderfahren der Spreizklammern 15 in Abhängigkeit von der zuvor ermittelten Länge des Querrands 17 in mehreren Stufen bzw. Schritten mit jeweils unterschiedlichen Geschwindigkeiten erfolgt. Beispielsweise werden zunächst die Spreizklammern 15 ziemlich rasch auseinandergefahren, aber kurz vor Erreichen der errechneten Länge des Querrands 17 abgebremst und mit einer geringeren Geschwindigkeit auseinandergefahren, um das Wäschestück 10 langsam vollständig auszubreiten. Das lässt ein exaktes Anfahren der zum größtmöglichen Ausbreiten des Wäschestücks 10 führenden Position der Spreizklammern 15 und zur größtmöglichen Schonung des Wäschestücks 10 während des vollständigen und/oder größtmöglichen Ausbreitens bzw. Streckens zu.It is also conceivable that the spreading clamps 15 are moved apart in a number of stages or steps, each with different speeds, depending on the previously determined length of the transverse edge 17 . For example, the spreading clamps 15 are initially moved apart fairly quickly, but braked shortly before the calculated length of the transverse edge 17 is reached and moved apart at a lower speed in order to slowly and completely spread out the item of laundry 10 . This allows an exact approach to the position of the spreading clamps 15 leading to the greatest possible spreading out of the item of laundry 10 and to the greatest possible protection of the item of laundry 10 during the complete and/or greatest possible spreading out or stretching.

Bezugszeichenliste:Reference list:

1010
Wäschestücklaundry item
1111
Zuführrichtungfeeding direction
1212
Beladestationloading station
1313
Spreizeinrichtungspreading device
1515
Spreizklammerspreader clamp
1616
EckeCorner
1717
Querrandcross border
1818
Beladefördererloading conveyor
1919
Eckenfindercorner finder
2020
Transferklammerpaarpair of transfer clamps
2121
Transferklammertransfer clamp
2222
Auflegebereichhang-up area
2323
Walzenspaltnip
2424
Schienerail
2626
Messstrahlmeasuring beam
2727
Sensorsensor
2828
Gurtfördererbelt conveyor
2929
Gurtfördererbelt conveyor
3030
Walzeroller
3131
Walzeroller
3232
Durchlaufrichtungflow direction
3333
Reflektorreflector
3434
Längsrandlong edge
3535
Durchhangsag
3636
tiefste Stellelowest point
3737
tiefste Stellelowest point
3838
Zahnriementiming belt
3939
Zahnriemenscheibetoothed pulley

Claims (9)

  1. A method for feeding laundry items to a mangle or to another laundry treatment device, a respective laundry item (10) held at two adjacent corner regions or corners (16) of an upper transverse edge (17) by two spreading clamps of a spreading device (13) being spread out by targeted movement apart of the spreading clamps (15) while taking into consideration the determined length of the transverse edge (17), in order to eliminate or at least as far as possible eliminate a sag (35) of the front transverse edge (17) of the laundry item (10), and before transferring the corner regions or corners (16) of the front transverse edge (17) of the laundry item (10) to the spreading clamps (15), with the laundry item (10) held by holding means arranged upstream of the spreading device (13), a measurement of said laundry item is carried out and the length of the front transverse edge (17) of the laundry item (10) is determined therefrom, characterized in that, on the basis of the determined length of the laundry item (10) held on the holding means, the length of the transverse edge (17), which corresponds to the width of the laundry item (10), is derived from the lengths and widths and/or length-width ratios of different laundry items (10) stored in a data bank.
  2. The method as claimed in claim 1, characterized in that, before transferring the laundry item (10) to the spreading device (13), the width of the laundry item (10) or the length of its front transverse edge (17) is determined or derived from a measurement of the length of the laundry item (10) between the front transverse edge (17) held by the holding means and the opposite rear transverse edge (17).
  3. The method as claimed in claim 1 or 2, characterized in that, after determining the length of the laundry item (10) and/or the length, derived therefrom, of the front transverse edge (17) or the width of the laundry item (10), with the laundry item (10) held by the holding means, said laundry item is transferred directly from the holding means to the spreading clamps (15) or is first transferred to other holding means which then transfer the laundry item (10) with adjacent corners (16) or corner regions of the front transverse edge (17) to the spreading clamps (15).
  4. The method as claimed in any one of the previous claims, characterized in that the length of the laundry item (10) and/or the spacing of the transverse edges (17) of the laundry item (10) is measured or determined by at least one detection means as the transverse edges (17) of the laundry item (10) run successively past the corner finders (19) serving as holding means for transporting the respective laundry item (10) on their longitudinal edges (34) starting from the adjacent corners (16) of a leading transverse edge (17) to the adjacent corners (16) of a following transverse edge of the laundry item.
  5. The method as claimed in any one of the previous claims, characterized in that the length of the laundry item (10) is determined by at least one detection means with the laundry item (10) held with sagging transverse edges (17) by the holding means, in particular corner finders (19).
  6. The method as claimed in any one of the previous claims, characterized in that, on the basis of the length, determined upstream of the spreading device (13), of the front transverse edge (17) of the laundry item (10), after the transfer thereof to the spreading clamps (15), the latter are moved apart in a targeted and controlled manner to spread out the laundry item (10) to the smallest possible sag (35) of the front transverse edge (17) of the laundry item (10).
  7. An apparatus, in particular feeding machine, for feeding laundry items (10) to a mangle or to another laundry treatment device, having a spreading device (13) which has at least two spreading clamps (15), which can be moved apart and together, for adjacent corner regions or corners (16) of a front transverse edge (17) of the respective laundry item (10), with holding means of the laundry item (10) arranged upstream of the spreading device and having at least one detection means, assigned to the holding means, for determining at least one dimension of the laundry item (10), characterized in that the length of the laundry item (10) and the spacing of the transverse edges (17) of the laundry item (10) can be measured or determined by the at least one detection means when the laundry item (10) successively passes the holding means, and the width of the item of laundry (10) corresponding to the length of the front transverse edge (17) can be derived from the determined length of the item of laundry (10) held on the holding means on the basis of length/width ratios of different items of laundry (10) which are stored in a database.
  8. The apparatus as claimed in claim 7, characterized in that the holding means are designed as corner locators (19) which are assigned to opposite longitudinal edges (34) of the laundry item (10) and which transport the laundry item (10) at the opposite longitudinal edges (34) starting from a leading transverse edge (17) to the opposite trailing transverse edge (17).
  9. The apparatus as claimed in claim 7 or 8, characterized in that the at least one detection means is arranged between the holding means, in particular corner locators (19), assigned to opposite longitudinal edges (34) of the laundry item (10), particularly in such a way that the sagging transverse edges (17) can be detected preferably at the lowest points (36, 37) of the respective sag (35) by the at least one measurement beam (26) of the at least one detection means, directed transversely to the surface of the laundry item (10).
EP19173346.8A 2018-05-15 2019-05-08 Method and device for feeding laundry items, in particular to a mangle Active EP3569761B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018003878 2018-05-15
DE102018006466.3A DE102018006466A1 (en) 2018-05-15 2018-08-16 Method and device for supplying laundry items, in particular a defect

Publications (2)

Publication Number Publication Date
EP3569761A1 EP3569761A1 (en) 2019-11-20
EP3569761B1 true EP3569761B1 (en) 2023-02-01

Family

ID=66476399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19173346.8A Active EP3569761B1 (en) 2018-05-15 2019-05-08 Method and device for feeding laundry items, in particular to a mangle

Country Status (2)

Country Link
EP (1) EP3569761B1 (en)
DK (1) DK3569761T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045391B1 (en) * 2007-10-05 2015-03-25 Herbert Kannegiesser GmbH Method and device for feeding laundry items into a laundry treatment device, in particular a mangle
DE102015011602A1 (en) * 2015-09-10 2017-03-16 Herbert Kannegiesser Gmbh Method and device for spreading a laundry article
DE102015016230A1 (en) * 2015-12-16 2017-07-06 Herbert Kannengiesser Gmbh Apparatus for feeding laundry items to a defect
DE102016011676A1 (en) * 2016-09-29 2018-03-29 Herbert Kannegiesser Gmbh Method and device for feeding items of laundry to a laundry treatment device, preferably a defect

Also Published As

Publication number Publication date
EP3569761A1 (en) 2019-11-20
DK3569761T3 (en) 2023-04-24

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