EP2314191A2 - Unreeling device for a sheet of material - Google Patents

Abstract

The unwind stand has a supply roller (30) including web materials whose belt sleeve (32) is arranged on a barrel (28), and a removal device (72) conveying a material web (34) from the supply roller to a delivery point. The removal device is operated by a control system (100) depending upon time and/or depending upon conveying of the material web. A supply bottle (36) is partially arranged in the barrel of the supply roller and contains a medium that is applied to the material web on a path from the supply roller to the delivery point.

Description

The invention relates to a unwinding device for a material web according to the preamble of claim 1.

Unrolling devices for webs are used in various fields of technology, but also in sanitary and household use, e.g. in the form of apparatuses which peel off and sever pieces (e.g., towel dispensers) from an endless paper web.

Such unwinding devices are often mechanically operated, and the length of the respectively withdrawn portion of the material web is determined by mechanical stops.

A change in the length of the desired track sections can only be realized by mechanical intervention in the unwinding device.

By the present invention, therefore, a rolling device according to the preamble of claim 1 is to be developed so that a simple adjustment of the length of the dispensed piece of material is possible.

This object is achieved by a unwinding device with the given in claim 1 features.

In the unwinding device according to the invention, the length of the delivered web piece can be adjusted simply by specifying a desired path for the removal or and / by specifying a set time for the removal.

Advantageous developments of the invention are the subject of dependent claims.

In a unwinding device according to claim 2, the drawn-off material web can be provided on the way between the peel-off point and the delivery point with a medium which is held in a supply bottle. This is accommodated in the possibly somewhat larger core of the supply roll, so that the storage bottle can be accommodated in the roll without appreciable enlargement of the outer contour of the unwinding device.

In a unwinding device according to claim 3, the storage bottle is firmly housed in the housing and can thus also serve as a core carrier on which the supply roll is mounted.

In a unwinding device according to claim 4, the storage bottle need not be rotatably mounted in the device, which facilitates their replacement. The torque generated when unwinding from the supply roll is received by a core carrier disposed between the inner surface of the core of the supply roll and the outer surface of the supply bottle.

The development of the invention according to claim 5 allows in a particularly simple manner, the removal of an empty core and the insertion of a new supply roll under removing and reinserting the core carrier.

The development of the invention according to claim 6 is in view of well metered and uniform distribution of the applied medium on the surface of the web of advantage.

In a unwinding device according to claim 7 can be determined in a very simple manner, if still sufficient medium is applied to the web. The current flowing through the pump can be easily and reliably detected, whether the pump still delivers or runs completely or partially empty.

The development of the invention according to claim 8 is used to monitor that the material web is correctly provided with medium. This is particularly important if the applied medium is to fulfill hygienic tasks, e.g. is a disinfectant. Here an insufficient supply of disinfectant would lead to residues of bacteria and viruses remaining on the surfaces to be disinfected.

The development of the invention according to claim 9 makes it possible to calculate from the comparison between the predetermined peel speed of the web and the angular velocity of the supply roll the current radius of the remaining roll of the supply roll, from which then easily determine the percentage of the web, which still on the Supply roll is. For the same purpose, one can also compare the Abziehweg the Naterialbahn and the angle of rotation of the core.

The development of the invention according to claim 10 makes it possible to measure the angular velocity or the angular position of the supply roll with a sensor for which no mechanical connections between the supply roll and a fixed piece of equipment must be made. This encoder has a very simple and robust design and inevitably comes when inserting a supply roll in the ready state.

The fact that one uses different brand arrangements, one can accomplish over the angle (speed) encoder also recognizes different types of supply rolls, for example, at a given peel rate per unit time a different number of strokes is detected or the geometry of the marks is different, etc. The angle (speed) encoder can thus also serve for Tpyerkennung a supply roll.

The development of the invention according to claim 11 serves the already mentioned above determination of remaining on the supply roll remainder of material web.

With the development of the invention according to claim 12 it is achieved that the user is made aware that the material web is running low, and / or the puller is stopped, so that no further material web is dispensed.

In a unwinding device according to claim 13, the storage bottle is oriented horizontally, so that a supply roll in the usual horizontal orientation of its axis can be arranged above it. The storage bottle is designed so that it can drain away in its medium without leaving a residue under gravity.

The development according to claim 14 ensures that the storage bottle can be used only in an angular position in the unwinding, in which their sloping wall portion is below.

In a unwinding device according to claim 15, the storage bottle is arranged with a vertical axis. she can be very easy to insert into the device and remove from this. In typical bottle geometries, this arrangement completely empties the bottle even without special geometry. The storage bottle can itself form a core carrier on which the supply roll rotates when removing the material web. Characterized in that preferably provided under preferably 45 ° employed pulley, takes place also in this geometry of the arrangement of storage bottle and reservoir dispensing the web vertically downwards.

In a unwinding device according to claim 16, one can separate the nozzle tube and its fluid supply from the nozzle tube (e.g., to replace the reservoir bottle) without significant leakage of fluid.

• Figur 1: Eine schematische, teilweise vertikal geschnittene Ansicht eines Spenders für mit Desinfektionsmittel getränkte Papiertücher;
• Figur 2: eine axiale Aufsicht auf einen Kernträger des in Figur 1 gezeigten Tuchspenders zusammen mit einem Halteteil, über welches der Kernträger lösbar am Gehäuse des Tuchspenders angebracht ist;
• Figur 3: eine Aufsicht auf einen Ausschnitt der abgewickelten Innenfläche des Kernes der Vorratsrolle von Figur 1; und
• Figur 4: einen vertikalen Schnitt durch einen abgewandelten Tuchspender mit vertikal ausgerichteter Achse von von Vorratsflasche und Vorratsrolle.

The invention will be explained in more detail by means of exemplary embodiments with reference to the drawing. In this show:

• FIG. 1 : A schematic, partially vertical cut view of a dispenser for disinfectant soaked paper towels;
• FIG. 2 : an axial view of a core carrier of the FIG. 1 shown cloth dispenser together with a holding part, via which the core carrier is detachably attached to the housing of the cloth dispenser;
• FIG. 3 : A view of a section of the unwound inner surface of the core of the supply roll of FIG. 1 ; and
• FIG. 4 a vertical section through a modified cloth dispenser with vertically aligned axis of supply bottle and supply roll.

In FIG. 1 10 schematically shows the housing of a cloth dispenser having a rear wall 12, side walls 14, 16, 18, 20 and a door 21 which is largely broken away and hinged on the left.

The rear wall 12 carries two mirror-shaped holding parts 22, 24 for a tubular core carrier 26. On the core carrier 26 runs a core 28 of a total designated 30 supply roll, which carries a winding 32 of a pulp material web 34.

Inside the core carrier 26, a storage bottle 36 is arranged. In this there is a volume 38 of a disinfectant.

The storage bottle 36 has a substantially cylindrical shape, an in FIG. 1 but bottom bottom wall 40 is flat and runs obliquely to the left above. At the bottom of the bottom wall 40, two spaced foot ribs 42 are formed, which define a positioning groove 44 between them.

In the Positionierunut 44 engages in the sliding clearance a spherical projection 46, which is integrally formed on the inner surface of the core carrier 26.

How out FIG. 1 As can be seen, the storage bottle 36 extends axially to the right beyond the end of the core carrier 26 and there has a lower sump portion 48, to which a dispensing nozzle 50 is formed, which comprises a discharge bore 52.

In the upper portion of the protruding part of the supply bottle 36, a vent pipe 54 is provided. This contains a fine venting channel 56 and is tightly sealed in the factory.

By breaking off an upper end portion of the venting stub 54 at a predetermined breaking point 58, the venting duct 56 can communicate with the ambient atmosphere.

The dispensing nozzle 50 is connected to the inlet of a diaphragm pump 62 via a flexible conduit 60, indicated only schematically, in practice a flexible hose, which is pushed onto the bleeding nozzle 54.

The outlet of the diaphragm pump 62 is connected via a line 64 and a pressure relief valve 65 with a nozzle tube 66 which, on its in FIG. 1 rear wall portion is provided with a plurality of nozzle openings 68, which point to the top of the withdrawn from the supply roll 30 material web 34. The pressure relief valve 65 is disposed directly in front of the nozzle tube 66 at the end of the line 64, so that there is no significant amount of liquid between it and the nozzle tube, which could escape when removing the line 64.

Instead of a pressure relief valve 65, a solenoid valve may be provided in a modification, which is biased in the closed state and (possibly leading) is controlled when the diaphragm pump 62 is driven.

In FIG. 1 are denoted by 70 spray cones which produce the individual nozzle orifices 68 when the diaphragm pump 62 releases pressurized disinfectant.

As can be seen from the drawing, the spray cones 70 overlap in the transverse direction of the material web 34, so that it is sprayed substantially uniformly over the entire width with disinfectant.

For feeding the material web 34 to the nozzle tube 66, a drive unit designated overall by 72 is provided. This comprises an inlet-side deflection roller 74 which deflects the material web 34 drawn off from the supply roll 30 into a delivery plane (in this case the drawing plane). Further, the drive unit 72 includes a pair of rollers 76, 78, which are arranged one above the other in alignment and are coupled by gears 80, 82 for synchronous movement in opposite directions. A stepper motor 84 drives the upper roller 76 in the drawing.

Bearings for the idler 74 are shown at 86, bearings for the rollers 76, 78 at 88 and 90.

Downstream of the nozzle tube 66, a toothed knife body 92 is provided, which is made of an insulating plastic material. A sharp metal male connector 94 is inserted into the knife body 92.

On the underside, the knife body 92 carries disc-shaped electrodes 96 which are interconnected (not shown in detail) so that mutually poled voltages lie on successive of the electrodes 96, so that when the material web 34 is properly moistened, leakage currents flow between the electrodes 96. These leakage currents are transmitted via a cable 98 to a control unit 100, which controls the diaphragm pump 62 and the stepper motor 84.

The control unit 100 also monitors how much material web is still on the supply roll 30, whether sufficient liquid is supplied to the nozzle tube 66 and, as stated, whether the material web 34 is sufficiently moistened behind the nozzle tube 66.

In addition, some of the operating parameters of the towel dispenser can be adjusted on the control unit 100. By way of example, a rotary knob 102 is shown, on which the length of the delivered web sections (cloths) can be adjusted, further a rotary knob 104, with which the amount of the dispensed disinfectant can be adjusted, wherein the one end position of the rotary knob of a complete interruption of the supply of disinfectant equivalent.

A display 106 of the control unit 100 makes it possible to represent the operating parameters set by the user and to output these characterizing error codes when errors occur. Also, by a controllable sound source, not shown, different acoustic alarms are issued.

The control unit 100 also cooperates with a current sensor 108, which is connected in the supply line to the diaphragm pump 62. By monitoring the pump current can be continuously determined whether the diaphragm pump 62 promotes or runs empty.

The adjustment of the delivery rate of the diaphragm pump 62 can be effected via the frequency and the amplitude of the alternating current with which the diaphragm pump 62 is supplied.

How out FIG. 2 can be seen, the holding part 22 has a upwardly open recess 110 with a circular arc-shaped bottom portion 112 whose radius corresponds to the outer radius of the core carrier 26, and two parallel vertical wall portions 114, 116 which are rectilinear and hineinerstrecken in opposite vertical slots 118, 120 on opposite sides of the core carrier 26th are provided.

In this way, the core carrier 26 is secured against rotation, but removably mounted in the vertical direction in the holding part 22. The holding part 24 is formed in mirror image to the holding part 22, and the in FIG. 1 right end of the core carrier 26 equally has slots 118, 120, as in FIG. 1 left end of the core carrier 26. These slots are aligned with each other as seen in the axial direction.

The holding parts 22 and 24 are fixedly attached to the rear wall 12 of the housing 10, and you can remove the core carrier 26 together with the storage bottle located in it 36 upwards from the holding parts 22, 24, since the line 66 between the reservoir bottle 36 and diaphragm pump 62nd is correspondingly long.

The supply roll 30 (if needed) and / or the supply bottle (if needed) can then be removed from the core carrier 26 and replaced by a new supply roll 30 or a new supply bottle 36. Then the core carrier 26, together with the supply roll and storage bottle, is again inserted from above into the holding parts 22, 24.

In order to continuously have information about how much material web is still in the winding 32, a reflection light barrier 124 is provided in the interior of the projection 46, which is connected to the controller 100. The reflection light barrier 124 works with a Bar pattern 126 together, which is provided on the inner surface of the core 28, and approximately at the center thereof. The pattern 126 can be produced by printing a corresponding line pattern 126 as the innermost layer of the winding core rolled from glued paper. A section of this line pattern is in FIG. 3 shown.

Instead of a stroke pattern, you can also use a set of marks of different geometry. The marks may also be carried by a self-adhesive strip and applied to an axial end of the inner surface of the core 28. The marks may also be grooves or depressions embossed in the inside of the core 28. Also, hole patterns punched in the core 28 may serve as marks.

When removing the material web 34, the supply roll 30 and thus also the bar pattern 126 rotates accordingly. As long as the supply roll 30 is still full, the angular velocity of the rotation when removing a predetermined length of the material web is low, corresponding to a few strokes of the bar pattern 126 pass through the reflection light barrier 124. Each none of the diameter of the rest of the winding, the more dashes pass through the reflective light barrier 124 during removal a cloth.

The control unit 100 comprises a read-only memory in which, for all time intervals of line pulses which are traversed during unwinding of the supply roll 30, the remaining remainder of the material web on the reel 30 is stated as a percentage of the original stock.

This table can be determined once experimentally.

However, in the control unit 100, it is also possible to provide a computing circuit which calculates the radius of the residual winding from the known removal speed of the material web and the measured distance between successive line pulses. He can then convert this radius into the remaining length of the material web located on the winding, wherein taking into account the diameter change in a full rotation of the supply roll and the thickness of the web can be determined and used for the calculation. When using such a computer circuit thus no predetermined tables are necessary.

In the modified towel dispenser in FIG. 4 only the part of the dispenser is shown, which shows the arrangement of supply roll and storage bottle. The other parts of the cloth dispenser are according to FIG. 1 hinzuzudenken.

According to the embodiment FIG. 4 are components described above with reference to FIGS FIGS. 1 to 3 have already been explained, again provided with the same reference numerals, even if they differ in geometric details.

At the towel dispenser after FIG. 4 The supply bottle 36 has a cylindrical basic shape and is arranged vertically. An in FIG. 4 lower tapered cone portion 128 is closed by a screw cap 130 which carries a dispensing nozzle 50. This can be designed similar to the vent pipe 54 after FIG. 1 , After Auffschieben a stepped hose end to him a part of the dispensing nozzle can be stopped at a predetermined breaking point.

At the transition point between the cylindrical base body and the tapered end portion 128, the supply bottle 36 is provided with a retaining flange 132 having a circular basic shape, but with two opposite sides provided with flattenings 134, 136. These flattened portions of the retaining flange 132 are inserted into grooves 138, 140 of two holding parts 22, 24, which are again connected to the rear wall 12 of the housing 10.

In this way, the storage bottle can be easily removed from the front of the housing 10 and also easily inserted from the front back into the housing 10.

The cylindrical base body of the storage bottle 36 now represents the storage for the core 28 of the supply roll 30 at the same time.

This is accordingly arranged with a vertical axis in the housing 10.

About a bent at 45 ° pulley 74, the withdrawn material web 34 is deflected in the vertical downward direction. It then continues to drive unit 72, nozzle tube 66 and knife body 92 as described above. The driving and spraying of the web takes place in detail as in connection with FIG. 1 described.

According to the embodiment FIG. 4 the reflection light barrier 124 is supported by a projection 46 which is provided on a cover 142 of the housing 10. The bar pattern 126 is now provided at the upper end of the core 28 and cooperates with the beam of the reflective light barrier 124 shown at 144.

It can be seen that in the cloth dispenser described above, a reliable uniform moistening of cloths separated from a material web is obtained, which can be easily adjusted in intensity.

It will further be appreciated that in the towel dispenser described above, accurate measurement of the remainder web of material remaining on the roll of the supply roll is possible without having to cooperate with the outside of the supply roll with a tactile sensor measuring the current outside diameter of the roll. Such a sensor would only have to be lifted when replacing the supply roll and put out of the way, which passes through the supply roll during removal or insertion. Also, in the manner described above for determining the residual amount of the material web, the resolution is improved precisely in the critical region, in which there is only a small remainder of the material web on the core, since the angular velocity of the core increases towards the end of the material web.

It can also be seen that the cloth dispenser according to the invention is characterized by a very compact construction.

Claims (16)

Unwinding device for a material web (34), with
a supply roll (30) comprising a core (28) and an arranged thereon winding (32) of the web material, with a stripper (72) which conveys the material web (34) from the supply roll (30) to a delivery point, characterized in that the stripping device (72) is actuated by a controller (100) as a function of time and / or as a function of the conveying path of the material web (34). Unwinding device according to claim 1, characterized
net, that in the core (28) of the supply roll (30) a storage bottle (36) is at least partially disposed, which contains a medium which is applied to the material web (34) on the way from the supply roll (30) to the delivery point becomes. Unwinding device according to claim 2, characterized
by a form-fit, clamping or frictional connection between the supply bottle (36) and a holding device (22, 24) connected to a housing (10). Unwinding device according to claim 2, characterized
characterized in that between the outer surface of the storage bottle (36) and the inner surface of the core (28), a core support (26) is arranged, which is connected to a housing (10), preferably detachably. Unwinding device according to claim 4, characterized
records that the core carrier (26) pluggable or pivotally connected to the housing (10). Unwinding device according to one of claims 1 to 5, characterized by a pump (62), preferably a membrane pump which sucks from the supply bottle (36) and conveys it into a nozzle tube (66), which nozzle orifices (68) facing the conveying surface of the material web (34) ) having. Unwinding device according to claim 6, characterized
by a current sensor (108) which measures the current flowing through the pump (62) and by a control circuit (100) which is supplied with the actual current signal provided by the current sensor (108) and generates an alarm and / or the withdrawal device ( 72) stops when the actual current drawn deviates from a desired current. Unwinding device according to claim 6 or 7, characterized
net by a sensing device (96) disposed downstream of the nozzle tube (66) and responsive to the presence of media applied to the web (34) and by a control circuit applied to the output of the filling device (96) and an alarm generated and / or the stripper (72) stops when the actual output signal of the filling device (96) deviates from a desired value. Unwinding device according to one of claims 1 to 8, characterized in that the supply roll (30) cooperates with an angle encoder or angular speed sensor (124, 126). Unwinding device according to claim 9, characterized
that the angle encoder or angular velocity transmitter (124, 126) carries marks carried by the core (28) (126) and a brand sensor (124) cooperating with the latter. Unwinding device according to claim 9 or 10, characterized
characterized by a remaining winding computing circuit (100), which from the Abziehgeschwindigkeit, the Abziehstrecke or the peel time of the stripper (72) on the one hand and the output of the Winkelgeschwindigkeitsgebers (124, 126) or an angle encoder on the other hand, the diameter of the remaining roll and / or the remaining length of the calculated on the remaining wrap remaining material web. Unwinding device according to claim 11, characterized
by a control circuit (100), which is acted upon by a residual winding signal of the computing circuit (100) and
generates an alarm signal and / or the stripper (72) stops when the residual winding signal falls below a predetermined value and / or the output signal of the angular velocity generator (124, 126) is zero. Unwinding device according to one of claims 1 to 12, characterized in that the axis of the supply roll (30) is oriented horizontally and the material web (34) is withdrawn from it substantially vertically downwards, and that the supply bottle (36) in a predetermined angular position in Core (28) is arranged and then her down wall portion sloping down to a removal portion (148) of the storage bottle (36) out, in which a discharge nozzle (50) is provided. Unwinding device according to claim 13, characterized
shows that the storage bottle (36) has two spaced on the underside of the underlying wall portion spaced guide ribs (42) which between a guide projection (46) receive, which is preferably arranged on a between the supply bottle (36) and core (28) arranged core carrier (26) and preferably comprises a mark reader (124). Unwinding device according to one of claims 2 to 12, characterized in that the storage bottle (36) holding means (32), with which it is vertically aligned releasably secured to a housing (10) and that the supply roll (30) rotatably mounted on the storage bottle (32). 36) is placed, wherein the material web (34) is preferably withdrawn via a 45 ° -Umlenkrolle of the supply roll (30). Unwinding device according to one of claims 2 to 12, characterized in that the storage bottle (36) with a nozzle tube (66) via a line (60, 62, 64) is connected; which at the nozzle tube (66) adjacent the end of a closing valve (65).

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