DE3320362A1 - Appliance for the multiple transverse and longitudinal folding of laundry articles - Google Patents

Abstract

In the multiple transverse and longitudinal folding of laundry articles by transverse- and longitudinal-folding stations arranged in the region of belt-conveyor devices, an exact positioning of the multiply transverse-folded laundry article (10d) - folding tube - in the region of the first longitudinal-folding station (13) is important, so that the further longitudinal folds and the stacking of the folded laundry articles take place as exactly as possible. For this purpose, the transport of the laundry article in the region of the first longitudinal-folding station (13) is monitored by pulse comparison and is controlled in such a way that the laundry article is stopped in a predetermined recurring position which is determined by the position of a front edge (33) of the laundry article along a transversely directed line (stopping line X). <IMAGE>

Description

Device for multiple transverse and longitudinal folding

of laundry items Description: The invention relates to a device for multiple cross and lengthwise folding of laundry items (compact folding machine), with in the area of belt conveyors, transverse and Longitudinal folding stations, at least one belt conveyor that can be driven in a controlled manner in the first longitudinal folding station and controlled, switchable folding devices in all folding stations, as well as with these associated, the laundry items scanning devices for the controlled driving or switching of the belt conveyor and the folding devices.

The term "transverse folds" is used here for a fold which results in a fold line extending transversely to the conveying direction of the item of laundry. Correspondingly, in the sense of this definition, when "longitudinal folding" is concerned, an in the Fold line extending in the direction of conveyance of the item of laundry is generated.

Folding machines with several successive transverse and longitudinal folding stations are mainly known as a "compact folding machine", for example by DE-PS 28 23 047. The laundry items are conveyed by the individual Folding stations funded. A first longitudinal folding station, which is connected to several upstream Cross folding is connected to this known compact folding machine with a Folding sword that can be moved up and down is equipped as a folding organ.

The cross-folded items of laundry (folded tubes) are in the area the longitudinal folding station held ready on a horizontally extending belt conveyor, which stopped to carry out the longitudinal folding by lowering the folding blade will.

A similarly designed folding device is in the DE-OS 29 44 638 described. Here, too, the first longitudinal fold is in the area of a substantially horizontal belt conveyor completed.

In these known Fal tmaschi NEN it is not guaranteed that the (cross-folded) item of laundry always in the same place and with exactly aligned Relative position on the belt conveyor of the longitudinal folding station is positioned when the Longitudinal folding is to be carried out. An exact placement of the item of laundry on the stopped Belt conveyor is desirable for exact longitudinal folding. On the one hand, it should Item of laundry t d <'. R lvingsfolding longitudinal folding a certain Relative position take with respect to subsequent further longitudinal folding stations. These are also Associated belt conveyor that extend transversely to the original conveying direction and ultimately lead to a receptacle for the folded laundry items, in particular to a stacking device. It is important that the laundry items these belt conveyors the further longitudinal folding stations are fed in a predetermined relative position. Of further exists in the case of insufficiently precise positioning of the item of laundry in the In the area of the first longitudinal folding station, there is a risk that the items of laundry will be carried by the following Longitudinal folding stations are not folded exactly (congruently).

Particular difficulties as a result of the imprecise relative position of the items of laundry on the belt conveyor of the first longitudinal folding station results in folding devices in a multi-lane design, i.e. with at least two and independently operable transverse folding tracks. The problems then arise if such folding devices are operated in a single lane, i.e. items of laundry are driven that extend over several (two) lanes. In this case it is necessary that the item of laundry on the separately driven belt conveyors of the common first longitudinal folding station is precisely aligned and positioned when the (several or two) belt conveyors to carry out the longitudinal folding are held angel. One inaccurate placement of the item of laundry leads to an inclined position of the same with the The result is that the subsequent longitudinal folds are carried out incorrectly.

The invention is based on the object of folding devices, in particular with a multi-lane structure to further develop and improve that one exact, Recurring positioning of the laundry items in the area of a belt conveyor a first longitudinal folding station is guaranteed.

In order to achieve this object, a working method is provided according to the invention proposed, which is characterized in that the controlled drivable Belt conveyor has a pulse device with an associated pulse counting section and that the positioning of a leading edge of an item of laundry along a predetermined Line (stop line) in the first longitudinal folding station through controlled stopping of the belt conveyor drive (clutch-brake unit) based on a pulse comparison he follows.

The invention is based on the knowledge that the imprecise relative position of the item of laundry on the belt conveyor of the longitudinal folding station through different and movement characteristics that change during the operation of the folding device the belt conveyor and thus the item of laundry is caused. Fluctuations in the conveying speed of the belt conveyor result from adapting the same to the upstream defect, through change (wear and tear) of the drive and braking devices assigned to the belt conveyors etc .. With the invention, each item of laundry is carried by the belt conveyor of the (first) Longitudinal folding station regardless of speed in a predetermined relative position along promoted a transverse (imaginary) stop line.

The determination of the movement or speed characteristics the belt conveyor is carried out according to a further proposal of the invention by pulse counting along a pulse counting section (partial conveyor section of the item of laundry) and comparison of the impulse counting result with at least one pulse comparison number. In this preferred embodiment of the method according to the invention, the The number of pulses occurring along a specified pulse counting section is determined and compared with the arithmetic mean of several comparative counts. A (mean) value is then calculated from these, which corresponds to the exact end position of the Item of laundry at the stop line under the given circumstances. At a Technically noticeable change in the movement characteristics of the belt conveyor an appropriate adjustment is made.

It is particularly important to know that the end position of the item of laundry is determined by the length of a "follow-up path", that is to say by a necessary one Conveying path of the item of laundry after switching off or interrupting the drive for the belt conveyor.

The follow-up distance depends on the conveyor speed and the Effectiveness of braking devices of different lengths. According to the invention is made by comparing comparative measurements, in particular by comparing them of pulse counts, the ratio of a drive line to the follow-up line within the measuring section or pulse counting section formed from the two determined in such a way that independent the desired end position (stop line) from the given movement characteristics the item of laundry is reached.

When operating multi-lane folding machines, everyone is independent A separate impulse device is assigned to the path or to each belt conveyor. The e The length of the measuring sections or pulse counting sections of this belt conveyor is preferred in agreement, but in any case coincides with regard to the end (stop line X).

The length of the drive line and the follow-up line and so that the time of shutdown b-zw. Interruption of the drive for the respective Belt conveyors can be different depending on the measurement or counting results, to bring about the position of the item of laundry on the common, continuous stop line.

Further details of the invention relate to advantageous further developments the device (folding machine) of the controlled drive of the belt conveyor (s) the (first) longitudinal folding station, including the formation of an impulse device.

An exemplary embodiment of the invention is described below with reference to FIG Drawings explained in more detail. They show: Fig. 1 a folding device (compact folding machine) in a schematic side view, FIG. 2 is a plan view or a plan view in the area a (first) longitudinal folding station of the folding machine according to FIG. 1 on an enlarged scale, 3 shows a front view of the longitudinal folding station of the device according to FIGS. 1 and 2, FIG. 4 shows a detail in the area of the longitudinal folding station in a side view, FIG. 5 shows a schematic representation of a conveying section of an item of laundry in the area the longitudinal folding station in plan, Fig. 6 a detail, namely pulse counting device, on a pulley of a belt conveyor in longitudinal or axial section with enlarged Scale, FIG. 7 shows a cross section VII-VII in FIG. 6.

The one shown in the drawings as a preferred exemplary embodiment Folding machine is designed as a compact folding machine. Items of laundry lOa, lOb, lOc and 10d pass through a first cross-folding station 11 and a second cross-folding station one after the other 12, a first longitudinal folding station 13 and further longitudinal folding stations 14 and 15. For the transport of the laundry items lOa, lOb and for carrying out the folds are mounted on a machine frame 16 belt conveyor. A first belt conveyor 17 is Arranged like a table with an inclination towards the feed side of the item of laundry 10a.

The belt conveyor 17 consists - like the others to be described Belt conveyor - made up of a plurality of parallel belts 18, which run over pulleys 19 and 20 are performed. Of these, the one from the task side is expediently the deflection roller 20 located at a distance from the items of laundry is driven.

Below the belt conveyor 17 or below a lower strand 21 of the same, a further belt conveyor 22 with deflection rollers 23, 24 and 25 is mounted. An upper run 26 of this inclined belt conveyor 22 runs in close proximity to the lower run 21 of the belt conveyor 17. Between the lower run 21 and the upper run 26, an item of laundry 10b is conveyed after a first transverse fold.

Following the belt conveyor 22, another, essentially, follows horizontally directed belt conveyor 27. This closes one of the longitudinal folding station 13 associated belt conveyor 28 in essentially the same plane.

The first transverse folding station 11 is in the common deflection area of the Belt conveyors 17 and 22 are formed, namely in the area of the deflecting rollers 20 and 23. The transverse folding station 11 is designed as a slide-in folder an air jet nozzle tube 29. The item of laundry is underneath by means of an air jet Querfal device between the guide rollers 20 and 23 or the belts.

Also the cross-folding station formed between the belt conveyors 22 and 27- 12 is equipped with an air jet nozzle tube 30. The item of laundry is between the pulleys 24 and 25 on the one hand and a pulley 31 of the belt conveyor 27 on the other hand, folded transversely.

The item of laundry that is folded twice across in the present case is lOd promoted as a folded tube in the area of the longitudinal folding station 13. The one assigned to this Belt conveyor 28 must be able to move up and down in order to carry out the longitudinal folding Folding sword 32 are stopped. The lengthwise folding is carried out in such a way, that the item of laundry lOd (folding tube) is gripped centrally by the folding sword and between adjacent belts 18 of the belt conveyor 28 is pushed down.

In order to carry out this (first) longitudinal fold, the item of laundry should 10d assume an exact, constantly recurring relative position on the belt conveyor 28.

In the present case, this relative position is based on one in the conveying direction forward folding edge, namely a front edge 33 of the laundry item 10d determined.

When the belt conveyor 28 is at a standstill, the conveying edge should be at one predetermined or adjustable (imaginary) stop line X be aligned. These extends transversely to the conveying direction, exactly at a right angle to it. The position of the stop line is chosen so that the following longitudinal folds in the longitudinal folding stations 14 and 15 executed properly and in the end the folded item of laundry can be precisely stacked.

In order to repeatedly reach this position of the item of laundry lOd, the belt conveyor 28 is driven in a controlled manner, in such a way that according to the measure the actual movement characteristics of the conveying edge 33 of the item of laundry stop line X is stopped.

There are changing drive speeds of the belt conveyor 28 as well as the behavior of the organs involved that changes over time to be taken into account when stopping the belt conveyor 28.

At least one of the deflection rollers 34, 35 for this belt conveyor 28 is provided with a clutch-brake unit of suitable design, through which after According to the measured movement characteristics of the drive for the belt conveyor 28 is switched off and a brake is activated. The drive phase as well the delay phase until the belt conveyor 28 comes to a standstill are dimensioned in such a way that that the described end position of the item of laundry lOd is reached repeatedly.

For the movement control of the belt conveyor 28, the actual The transport path of the item of laundry lOd is determined independently of the speed and then the belt conveyor 28 is controlled. In the present specific embodiment 10 pulses are generated, counted and during the transport of the item of laundry evaluated in a comparative calculation.

For this purpose, the belt conveyor 28 is provided with an impulse device 36 assigned, which works as a function of the movement of the belt conveyor 28. As shown in Fig.

6 and 7, the pulse device 36 is on one of the pulleys 34, 35 arranged. This is rotatable with an axis 37 (bearing 38) in the Ma- machine frame 16 supported. On a pin attached centrally to the free end of the axle 37 39, the pulse device 36 is mounted via a coupling sleeve 40. A driving force 41 is accommodated in a non-rotatably mounted housing 42. The pulse generator consists of a perforated disk 43 along a circular path with equal intervals mutually arranged holes 44. Through this, signals are an inside of the housing 42 arranged transmitter 45 passed through in an opaque relative position. On the opposite side of the perforated disk 43 is coaxial with the transmitter 45 a receiver 46 is arranged within the housing 42. Every time a hole 44 of the rotating perforated disk 43 passes the transmitter 45, a pulse signal transmitted to the receiver 46. This is with a device for evaluation of the impulses, namely with a microcomputer.

The perforated disk 43 is arranged on a shaft piece 47, which in turn is connected to the coupling sleeve 40. That via a pivot bearing 48 on the shaft piece 48 supported housing 42 is by a bracket, namely by a in a Guide slot 49 of a projection 50 on the housing 42 entering rod-shaped Holder secured against turning. The holder 51 is connected to the machine frame 16.

The conveying path covered by the item of laundry up to the stop line X is marked by a certain number of pulses. In the present embodiment is a sub-area of the conveying route of the item of laundry 1 tod through the belt conveyor 28 is determined as a pulse counting section Z limited in the conveying direction. During transport the leading edge 33 of the item of laundry lOd along this pulse counting distance Z the described pulse device 36 is switched on or are those of this generated pulses are counted and, if necessary, to correct the drive of the belt conveyor 28 evaluated. The pulse counting distance Z can, as shown in FIG. 4, be smaller Have length than that of the item of laundry lOd. The start of the pulse counting section Z is determined by a triggering organ, in the present case by an (electro-optical) Button 52 for the front edge 33 of the item of laundry. The button 52 is above here the movement path of the item of laundry lOd attached to a holder 53. The end of Pulse counting section Z is defined by the stop line X.

The special feature of conveying the item of laundry up to the stop line X is characterized in that after switching off or uncoupling the drive the funding is still "lagging behind". The pulse counting section Z is subdivided for this reason into a drive section A and into a follow-up section N. In the area of a separation point Y the shutdown or uncoupling of the takes place between the aforementioned areas Drive, so that the belt conveyor 28 then, that is, in the area of the follow-up section N, is decelerated to a standstill, namely is braked. The entire pulse counting distance Z is also like the drive path A and the follow-up path N through a certain Number of pulses. The number of pulses for section A. and N is variable within the total length or number of pulses of the pulse counting section Z.

In the present exemplary embodiment (FIG. 4), the predetermined one may be The number of pulses for the pulse counting section Z is 200 pulses as an example. The number the impulses in the area of the drive line A. e.g. be 70. The folding machine is (empirically) adjusted to these conditions during the setting. If, in the course of operation, changes in the movement characteristics of the Belt conveyor 28 the measured number of pulses over the entire pulse counting distance Z change, namely remains below 200 or exceeds this number, an Adaptation in such a way that the separating point Y is at the beginning or end of the pulse counting section Z is shifted.

Is the measured number of pulses below the specified number (e.g. 200) the separation point Y must correspond to the calculated differences in the direction of the stop line X, the number of pulses in the range of Drive path A is therefore larger. If, on the other hand, the measured number of pulses is too high, i.e. above 200, and therefore the required follow-up distance N must be selected larger, the separation point Y is shifted in the direction to the beginning of the pulse counting section Z.

The number of pulses in the area of the drive line A is in this Fall smaller than the given value of, for example, 70.

The pulse measurements are evaluated in a microcomputer 54. The number of times from the beginning of the pulse measurement to the standstill of the belt conveyor 28 detected pulses become a comparison pulse number stored in the microcomputer 54 juxtaposed. If there is a problematic deviation in terms of folding -between the measured number of pulses and the stored comparison number is given the adjustment of the drive of the belt conveyor 28 by shifting the separation point Y (time at which the drive was switched off or uncoupled) in one way or the other Direction within the pulse counting section Z. The arrangement can be made in such a way that that one a certain minimum difference in impulses must be given, before the adjustment is carried out. Furthermore, a number of pulse counts and from these the arithmetic mean to determine the relevant Pulse number are formed.

The use of this procedure is associated with particular advantages, if the folding machine has several, for example two, transverse folding webs B1 and B2.

Such an embodiment is shown in FIGS. 2, 3 and 5.

The relevant belt conveyor 28 in this exemplary embodiment is shown in FIG two adjacent partial belt conveyors 28a, 28b divided. These are in designed in the same way and dimensioned the same size. Deflection rollers 34a, 34b and 35a and 35b of these partial belt conveyors 28a, 28b are arranged coaxially. Through this Formation of the belt conveyors 28a, 28b in the area of the first longitudinal folding station 13 is alternatively, the folding machine can be operated in one or two lanes.

The belt conveyors 28a, 28b or their deflection rollers 34a, 34b are driven by a common drive motor 55. Its drive is via a first chain drive 56 is transmitted to an intermediate drive shaft 57. This in turn is via further chain drives 58 and 59 with the pulley 34a and 34b, respectively tied together. The drive is transferred to this via clutch-brake units 60 and 61 at the ends of the pulleys 34a, 34b. With these clutch-brake units 60, 61, the microcomputer 54 is connected to in accordance with. of impulse calculations the termination of the drive (end of the drive line A) by uncoupling while the drive is still running Drive motor 55 and switching on a brake to effect.

The pulse device 36 is in each case in this exemplary embodiment assigned to the opposite pulleys 35a, 35-b. Again, there is an electric one Connection to the microcomputer 54 is given.

In the embodiment discussed here, the partial belt conveyors 28a, 28b three folding swords 32, 32a and 32b assigned. Below the same or below the partial belt conveyors 28a, 28b are in the area of the folding blades 32, 32a, 32b, in a manner known per se, insertion conveyors 62, 63; 64, 65; 66, 67 in pairs arranged. Between each pair of opposing push-in conveyors, this is the case Items of laundry to be folded lengthwise inserted 1 dead. With two-lane operation of the device are the folding blades 32a and 32b with the push-in conveyors 62, 63 and 66, 67 assigned to the transverse folding webs B1 and B2. In single-lane operation, the folding sword comes 32 with the push-in conveyors 64 and 65 to the effect, namely in the area between the two partial belt conveyors 28a, 28b.

Below this first longitudinal folding station 13 described above is a Also arranged as a belt conveyor cross conveyor 68. On this one the once longitudinally folded items of laundry are lOd the further longitudinal folding station 14 in the form of a bridge folder and finally fed to the longitudinal folding station 15, which in the present embodiment according to the principle of the "stack and fold system" is trained. The items of laundry grasped by a pincer-shaped folding element 69 are placed on a stacker 70 that can be moved up and down.

As can be seen from Fig. 5, in the area of the partial Belt conveyor 28a, 28b each form a separate pulse counting section Z1 and Z2, respectively. This is in the manner described through the separation points Y1 and Y2 in drive lines Al and A2 as well as in follow-up lines N1 and N2. Since the movement resp.

Drive characteristics of the partial belt conveyors 28a, 28b are different can be, the separation points are Y1 and Y2 depending on the independently measured pulses may not be aligned in the same transverse plane. The end of both pulse counting sections Z1 and Z2 are always marked by the common, continuous stop line X. The start of the pulse counting sections Z1 and Z2 is also common here Transverse plane, specified by separate buttons 52a, 52b for each pulse counting section Z1, Z2.

In the manner already described, each pulse counting section Z1, Z2 is continuously monitored with regard to the actual number of pulses and if necessary individually corrected so that a common item of laundry or individual items of laundry always stopped with the front edge 33 in the stop line X for each transverse folding web B1, B2 will.

The sequence described shows that incorrect positioning has been found of laundry items by means of pulse comparison to make corrections to the following Laundry leads. In the case of large positioning differences, the correction Over a longer period of time, i.e. gradually over several subsequent items of laundry take place.

LIST OF REFERENCE SYMBOLS: 10a, - b, c, d item of laundry 11 cross folding station 12 Cross folding station 13 Longitudinal folding station 14 Longitudinal folding station 15 Longitudinal folding station 16 Machine frame 17 Belt conveyor 18 Belt 19 Deflection rollers 20 Deflection rollers 21 Deflection drum 22 Belt conveyors 23 Deflection rollers 24 Deflection rollers 25 Deflection rollers 26 Upper run 27 Belt conveyors 28, 28a, 28b Belt conveyor 29 Air jet tube 30 Air jet tube I Deflection roller 32, 32a, 32b folding sword 33 leading edge 34, 34a, 34b pulleys 35, 35a, 35b pulleys 36 impulse device 37 axle 38 bearing 39 pin 40 coupling sleeve 41 Pulse generator 42 Housing 43 Perforated disc 44 Hole 45 Transmitter 46 Receiver 47 Shaft piece 48 pivot bearing 49 guide slot 50 attachment 51 holder 52, 52a, 52b button 53 holder 54 Microcomputer 55 Drive motor 56 Chain drive 57 Intermediate drive shaft 58 Chain drive 59 Chain drive 60 Clutch-brake unit 61 Clutch-brake unit 62 Push-in conveyor 63 Infeed conveyors 64 Infeed conveyors 65 Infeed conveyors 66 Infeed conveyors 67 Push-in conveyor 68 Cross conveyor 69 Folding element 70 Forklift X Stop line A, Al, A2 Drive section (from Z) B1, B2 Cross-folding panels N, N1, N2 Follow-up sections (from Z) Y, Y1, Y2 Separation point between the drive section and the follow-up section of the pulse-counting section Z, Z1, Z2 pulse counting sections - blank page -

Claims (15)

Device for multiple cross and lengthwise folding of laundry items Claims: Device for multiple cross and lengthwise folding of laundry items (compact folding machine), with successively arranged transverse and longitudinal folding stations, at least one belt conveyor that can be driven in a controlled manner in the first longitudinal folding station and controllable, switchable folding devices in all Folding stations, as well as with these associated, the laundry items scanning devices for the controlled driving or switching of the belt conveyor and the folding devices, there characterized in that the belt conveyor which can be driven in a controlled manner (28; 28a, 28b) a pulse device (36) with an associated pulse counting section (Z; Z1, Z2) and that the positioning of a front edge (33) of an item of laundry (lOd) along a predetermined line (stop line X) in the first longitudinal folding station 13 by controlled shutdown of the belt conveyor drive (clutch-brake unit 60, 61) takes place on the basis of a pulse comparison. 2. Apparatus according to claim 1, characterized in that the belt conveyor (28; 28a, 28b) with the item of laundry (lOd) in the area of the pulse counting section (Z, Z1, Z2) runs through a drive section (A; Al, A2) and a follow-up section (N, N1, N2). 3. Apparatus according to claim 1 or 2, characterized by an am Laundry scanning device arranged at the beginning of the pulse counting section (Z; Z1, Z2), . In particular an electro-optical button (52; 52a, 52b). 4. Apparatus according to claim 1 and one or more of the other Claims, characterized in that the stop line (X) at the end of the pulse counting section (Z; Z1, Z2) is arranged. 5. The device according to claim 1 and one or more of the other Claims, characterized in that the pulse device (36) on a drive or pulley (35; 35a, 35b) of the belt conveyor (28, 28a, 28b) is arranged. 6. The device according to claim 1 and one or more of the other Claims, characterized in that the belt conveyor (28; 28a, 28b) is interposed a clutch-brake unit (60, 61) is driven. 7. The device according to claim 6 and one or more of the other Claims, characterized in that the clutch-brake unit (60, 61) - each - on a driving pulley (34; 34a, 34b) of the belt conveyor (28; 28a, 28b) is arranged. 8. The device according to claim 3 and one or more of the other Claims, characterized in that the laundry item scanning device (button 52; 52a, 52b) -, the pulse device (36) and the clutch-brake unit (60, 61) are coupled (wired) to a microcomputer (processor) (54) and the Impulse comparison is carried out by the micro computer (54). 9. The device according to claim 1 and one or more of the other Claims, characterized by comparing the determined pulses along the pulse counting section (Z; Zl, Z2) with a predetermined, adjustable, stored in the microcomputer (54) Number of pulses. 10. The device according to claim 2 and one or more of the other Claims, characterized in that in the case of deviations (ascertained in comparison) of the measured pulses from the predetermined ones stored in the microcomputer (54) Pulses the separation point (Y; Y1, Y2) between the drive line (A; Al, A2) and the follow-up section (N; N1, N2) newly determined (relocated) by the microcomputer (54) will. 11. The device according to claim 10 and one or more of the other Claims, characterized by the use of a newly determined separation point (Y; Y1, Y2) for the next or later positioning of an item of laundry (lOd). 12. The device according to claim 10 and one or more of the other Claims, characterized in that if there are significant deviations between the rule Number of counted pulses and the number of (stored) pulses from the microcomputer (54) the adaptation (adjustment) of the separation point (Y; Vl, Y2) in two or more, is carried out depending on an item of laundry. 13. The device according to claim 12 and one or more of the other Claims, characterized in that a plurality of results are consecutive Counts of pulses are added and an arithmetic mean is formed and this is compared with the number of pulses stored in the computer. 14. The device according to claim 1 and one or more of the other Claims, wherein at least two are arranged side by side, independently of each other Drivable transverse folding tracks (work lines) are formed and the belt conveyor in the area of the first longitudinal folding station corresponding to the transverse folding paths in each for controlled drivable part belt conveyor is divided, characterized in that that each of these partial belt conveyors (28a, 28b) with a separate impulse device (36) is provided with an assigned pulse counting section (Z1, Z2) and that the positioning of the leading edge (33) resting on several partial belt conveyors (28a, 28b) Laundry item (led) along the predetermined line (stop line X) by controlled Shutting down all the partial belt conveyors (28a, 28b) conveying the item of laundry as required a pulse comparison takes place. 15. The device according to claim 14 and one or more of the other Claims, characterized in that the individual belt conveyors (28a, 28b) measured impulses of a common, changeable, in the microcomputer (54) stored number of pulses are compared.