EP0483749A1 - Dispenser for issuing sections of a strip of material from a supply roll - Google Patents

Abstract

The dispenser has a housing (42) which has a roll holder for the dispensing roll (38) and a dispensing opening (55). A fixed knife (12) protrudes from the discharge opening (55). A portioning roller (1) is mounted in the housing (42) on the path of the material web (39) from the dispensing roller (38) to the dispensing opening (55) to define a section length of the material web (39). The knife (12) is normally covered by a cover strip (10) which can be moved away from the knife (12) by pulling on the material web (39). The cover strip (10) is connected to the control lever (15) in such a way that it releases the portioning roller (1) after the material web (39) has been cut off. <IMAGE>

Description

The invention relates to a dispenser, in particular a paper towel dispenser, in which web sections of a defined length can be pulled off a dispensing roll and can be separated on a knife.

In known paper towel dispensers, the user grasps the protruding beginning of the paper web, usually with both hands, and subtracts a length from the dispensing roll. In general, the dispensers are designed so that only a certain length can be pulled off and the paper web is then locked. The user can then pull the paper web against a knife arranged on the dispenser in order to cut off the length that has been removed. The knife, which is mostly serrated, is located near the beginning of the web hanging out of the dispenser. When gripping the beginning of the path there is therefore a risk that the user injures himself on the knife.

DE 3049840 C2 discloses a film dispenser with a housing, on which an electrically heatable wire is arranged as a film cutting device near an output opening. The wire is with a drop plate-like The shutter is normally covered in such a way that the user who reaches for the beginning of the film to pull out a piece of film cannot easily burn his fingers on the wire.

Another film dispenser is known from DE 2804555 A1. There, a knife is arranged on a carriage to separate the film and normally takes a rest position, in which the knife is under a cover. The film is guided over deflection rollers mounted on the slide in such a way that a user can pull the slide into a position in which the knife is free to cut the film by exerting a pull on the beginning of the film. From this position, the sledge with the knife automatically returns to its rest position.

Another dispenser for film or paper web sections is known from DE 3705808 A1. The dispenser has a housing in which a knife is pivotally mounted and is controlled by a spring-loaded slide. The material web is guided over the slide in such a way that the knife is pivoted out of the housing only when the slide is moved by pulling off the material web.

With all these known dispensers, it cannot be ruled out with sufficient certainty that hurried or inexperienced users, especially children, injure themselves on the cutting device. This applies particularly to dispensers with a movable cutting device, the more or less jerky emergence of which from the housing can surprise the user.

The invention is therefore based on the object of making a dispenser for dispensing sections of a material web from a dispensing roll even more secure, without significantly increasing the design effort for moving parts.

• ein Gehäuse, das einen Rollenhalter für die Abgaberolle und eine Ausgabeöffnung aufweist,
• ein feststehendes Messer, das aus der Ausgabeöffnung herausragt,
• eine Portionierwalze, die im Gehäuse auf dem Weg der Materialbahn von der Abgaberolle zur Ausgabeöffnung gelagert und schrittweise drehbar ist,
• einen Steuerhebel, durch den die Portionierwalze in einer bestimmten Winkelstellung stillsetzbar ist, um eine Abschnittlänge der Materialbahn zu definieren, und
• eine Abdeckleiste, die das Messer normalerweise abdeckt, durch auf die Materialbahn ausgeübten Zug vom Messer wegbewegbar ist und derart mit dem Steuerhebel verbunden ist, daß dieser die Portionierwalze jeweils nach dem Abtrennen der Materialbahn freigibt.

A donor with whom this object is achieved has according to the invention

• a housing which has a roll holder for the discharge roll and a discharge opening,
• a fixed knife sticking out of the dispensing opening,
• a portioning roller which is mounted in the housing on the path of the material web from the dispensing roller to the dispensing opening and can be rotated step by step,
• a control lever by means of which the portioning roller can be stopped in a specific angular position in order to define a section length of the material web, and
• a cover strip, which normally covers the knife, can be moved away from the knife by pulling on the material web and is connected to the control lever in such a way that it releases the portioning roller after each separation of the material web.

With the dispenser according to the invention, the user can grasp the beginning of the web hanging out of the dispensing opening safely with both hands, since the knife is covered by the cover strip and therefore cannot be touched by the hands. The cover strip is preferably locked in this position, so it cannot be accidentally removed from the knife. Only when the material web is unwound in the full length provided for a web section, that is to say the user's hands are at a greater distance from the knife, is the cover strip released, so that the material web with the knife comes into engagement. As soon as the material web is cut through, the cover strip automatically returns to its position in which it covers the knife.

The cover strip is preferably simply connected to the control lever in that it is attached to a support arm of the control lever.

It is useful if the control lever has a stop arm and is normally held by a return spring in a position in which a stopper arranged on the portioning roller abuts the stop arm.

The control lever also preferably has a guide arm, which engages in each case in a guide formed on the portioning roller and permits a limited rotation of the portioning roller if the control lever has been pivoted into a position against the force of the return spring by a force exerted by the material web on the cover strip in which the stop arm releases the stopper.

The guide can be designed as a U-shaped groove on an end face of the portioning roller.

The portioning roller is preferably connected to an eccentric drive which converts the force of a transport spring into a moment rotating the portioning roller when the guide arm engages in the guide. This ensures that the material web is automatically moved forward by a further piece each time a web section is severed, which can be easily grasped the next time it is used.

The safety against injury of the dispenser according to the invention can be further increased by assigning two control strips to the control lever, between which the knife is arranged.

It is advantageous if the control lever has a pivot axis parallel to the portioning roller and the knife and the two cover strips are curved coaxially about the pivot axis.

Fig. 1

eine perspektivische Ansicht eines Spenders in geöffnetem Zustand,

Fig. 2

den oberen Teil des senkrechten Schnittes II-II in Fig. 1, wobei der Spender jedoch geschlossen und betriebsbereit ist,

Fig. 3

den unteren Teil desselben Schnittes,

Fig. 4

den Schnitt IV-IV in Fig. 2 in größerem Maßstab,

Fig. 5

die Seitenansicht V in Fig. 4,

Fig. 6

die teilweise als senkrechter Schnitt gezeichnete Seitenansicht in Richtung des Pfeils VI in Fig. 1,

Fig. 7

den senkrechten Schnitt VII-VII in Fig. 6,

Fig. 8

einen der Fig. 3 entsprechenden Teilschnitt eines abgewandelten Spenders und

Fig. 9

eine Einzelheit in Schrägansicht gemäß Pfeil IX in Fig. 8.

Embodiments of the invention are described below with reference to schematic drawings. Show it:

Fig. 1

a perspective view of a dispenser in the open state,

Fig. 2

the upper part of the vertical section II-II in Fig. 1, but the dispenser is closed and ready for use,

Fig. 3

the lower part of the same cut,

Fig. 4

the section IV-IV in Fig. 2 on a larger scale,

Fig. 5

the side view V in Fig. 4,

Fig. 6

the partially drawn as a vertical section side view in the direction of arrow VI in Fig. 1,

Fig. 7

the vertical section VII-VII in Fig. 6,

Fig. 8

a partial section corresponding to FIG. 3 of a modified dispenser and

Fig. 9

a detail in an oblique view according to arrow IX in Fig. 8.

The dispenser shown in Fig. 1 to 7 has a hinged housing 42, or the like on a building wall. to hang up. In the upper area of the housing 42, a dispensing roller 38 is supported on stumps 26. The delivery roll 38 contains a material web 39, for example a paper web. Each of the stumps 26 consists of a downwardly sloping pipe section and is an integral part of an upper folding bearing 24, which is pressed by means of a pressure spring 25 through a right or left inner wall 56, 57 of the housing 42 and is mounted on this with a folding pin 23 and can be folded out. The hinge pin 23 is received by eye bearings 66 which are formed on the inner walls 56, 57.

There is a space between the inner walls 56 and 57 of the width of the dispensing roller 38. The dispensing roller 38 has a winding tube 76 and is inserted from below, along the bevel 47 of the bearing stubs 26, which fold outwards until the pressure springs 25 press the bearing stumps 26 press into the winding tube 76. On the rear wall 53 of the housing 42, a limiter 51 is formed, which limits the available space so that only dispensing rollers 38 with a defined maximum diameter can be used.

A button 31 rests on the delivery roller 38; this is a two-armed lever which is mounted on a bearing pin 32 and is held in the support position by means of a key spring 33. A hinge pin 30 connects the button 31 to a rod 29 which is guided in a rod guide 49. The lower end of the rod 29 is in engagement with a catch 28 of a pivot plate 27, which is pivotable about a pivot pin 22 and carries one of two lower folding bearings 24.

By pulling the material web 39 from the dispensing roller 38, its diameter is reduced, so that the front part of the button 31 continuously moves downward and thus the rod 29 is pulled upwards until the rod 29 releases the catch 28 when the dispensing roller 38 is almost empty . A spring 48 then moves the swivel plate 27 together the lower folding bearing 24 mentioned in the direction of a toothed roller 21 which is mounted in a toothed roller block 46.

A supply roll 40 rests on both sides in the lower folding bearings 24. Only one of the lower folding bearings 24 is located on the swivel plate 27, i.e. that the supply roll 40 is pressed on one side by the spring 48 onto the toothed roll 21 and is thereby pivoted away by a brake 20. As a result, the brake 20 is no longer engaged with the circumference of the supply roll 40, so that it can now rotate freely.

The toothed roller 21 presses the material web 39 coming from the dispensing roller 38 against the supply roll 40, so that the beginning of the web 41 unwinds when the material web 39 is pulled off the supply roll 40, reaches pressure rollers 19, is guided over a portioning roller 1 and to the discharge opening 55 of the Dispenser arrives. The pressure rollers 19 are assigned friction linings 2 on the portioning roller 1, so that the material web 39 runs without slipping over the portioning roller 1.

Now two material webs are temporarily output at the same time, i.e. when the web of material 39 is torn off by means of a knife 12, two web sections 50 are removed. This doubling of the web of material 39 lasts until the upper delivery roll 38 is exhausted, so that two to five double sheets are output before the supply roll 40 is unwound exclusively.

On the supply roll 40 lies a level lever 34 loaded by a spring 36 with a level sensor 37. The housing 42 has a front wall 54 which can be folded forward and has a window 35 through which a scale 52 arranged on the level lever 34 is visible. The The fill level of the dispenser can thus be read from the outside. The scale 52 is designed so that a warning already occurs when two thirds of the supply roll 40 have been used up. If the dispenser is refilled in this state, the now partially used supply roll 40 is exchanged for the empty winding tube 76 of the dispensing roll 38 and a new supply roll 40 is inserted into the dispenser.

According to FIG. 1, the trigger mechanism for bringing the supply roll 40 into position can be constructed differently from FIGS. 2 to 6 as follows:

The dispensing roller 38 is scanned by a slide 69 resting on it. The slider 69 is integrally formed on a flat lever 71 which is rotatable about a bolt 70 and has a pin 72 at its end opposite the slider 69. The pin 72 engages in a control fork 73 of an L-shaped lever 74, which is mounted on a bearing pin 75 on the right inner wall 57 of the housing 42. The front arm of the L-shaped lever 74 has a hook-shaped stop 77 which engages behind a projection 78 of the lower folding bearing 24 arranged further down on the swivel plate 27.

When the material web 39 is unwound from the upper dispensing roll 38, its diameter decreases, so that the slide 69 moves in the direction of the winding tube 76. As a result, the flat lever 71 rotates so that its pin 72 moves the control fork 73 in the direction of the rear wall 53 of the housing 42 and thereby rotates the L-shaped lever 74 so that the stop 77 is raised above the projection 78. A tension spring 79 connects a point of the right inner wall 57 with an extension 80 of the swivel plate 27 or the lower folding bearing 24 and thereby pulls the supply roll 40 onto the toothed roll 21.

2 to 6, the toothed roller 21 is seated in the toothed roller block 46, which is an integral part of the front wall 54. The front wall 54 is supported in bearings 58 in the right and left inner walls 57, 56 and, in its upper region near the rear wall 53, has a holding slot 67 into which a resilient hook 68 arranged on the rear wall 53 engages (FIG. 6 ).

In the lower region of the front wall 54, the portioning roller 1 is mounted between bearing blocks 81 and is folded forward when the front wall 54 is folded down, so that the material web 39 can be passed comfortably between the pressure rollers 19 and the portioning roller 1 when the rollers are changed. The bearing blocks 81 are connected to one another by a cross member 16 on which the knife 12 is formed. A bolt 7, on which a three-armed control lever 15 is mounted, is fastened to one of the bearing blocks 81. The control lever 15 has a guide arm 5 with a hole 14 in which one end of a return spring 13 is hooked; the other end of which is attached to a retaining bolt 11 in the front area of the bearing block 81.

If the material web 39 is pulled off, the portioning roller 1 is thereby rotated until a stop 17 on one end face 43 of the portioning roller 1 strikes against a stop 18 on a stop arm 6 of the three-armed control lever 15. As a result, the rotation of the portioning roller 1 and thus also the removal of the material web 39 is ended. The material web 39 is pressed by the tension now occurring in it against a cover strip 10, which is formed on a support arm 9 of the control lever 15.

The support arm 9 is consequently pivoted clockwise according to FIG. 3, ie towards the operator. Before the stop 18 releases the stopper 17, a occurs on Guide arm 5 seated guide pin 4 into a guide 3, which is formed by a U-shaped groove 3 on the end face 43 of the portioning roller 1. As a result, the support arm 9 reaches a release position 44, in which it releases the knife 12. At the same time, a nose 65 formed on the guide arm 5 engages in a recess in the portioning roller 1, so that this is prevented from rotating further.

The portioning roller 1 has two axle journals 8, one of which reaches through the associated bearing block 81 and carries at its outer end a curved segment 63 which has a flattened portion 64. 6 and 7, the cam segment 63 engages with a sliding surface 60 on a transport lever 59 which is mounted on a pin 62 on the bearing block 81 and is pressed against the cam segment 63 by a transport spring 61. If the material web 39 is pulled off and the portioning roller 1 is thus rotated, the curve segment 63 is rotated at the same time, i.e. the sliding surface 60, which rests on the flattened portion 64 when the portioning roller 1 is at rest, slides along the circumference of the curve segment 63, moves the transport lever 59 downward and thereby tensiones the transport spring 61. The moment the greatest tension of the transport spring 61 is reached is, the portioning roller 1 is locked in that its stopper 17 strikes the stop 18 of the three-armed control lever 15.

After the material web 39 has been torn off, that is to say at a time when the support arm 9 is held in the U-shaped groove 3 via the guide pin 4 and the stopper 17 is no longer in contact with the stop 18, the transport spring 61 pulls the transport lever 59 to its rest position and thereby rotates the portioning roller 1 until the guide pin 4 has emerged from the U-shaped guide 3 again and thus the support arm 9 has again guided the cover strip 10 over the knife 12. The cover strip 10 has thus returned to its initial position 45 and a new piece of material web 39 has been transported to the outside, which can now be gripped.

8 and 9, an embodiment is shown which differs from the dispenser described with reference to FIGS. 1 to 7 in that in addition to the cover strip 10, a further cover strip 90 is fastened to the support arm 9 of the control lever 15 and these two cover strips are the knife 12 between them. The knife 12 and the two cover strips 10 and 90 have a cylindrical curvature, the axis of which coincides with the pivot axis 7 of the control lever 15. The fixed knife 12 is only a very small radial distance from the two cover strips 10 and 90, which is just sufficient to give the cover strips the freedom of movement required for their pivoting movements about the pivot axis 7.

Instead of the eccentric drive shown in FIGS. 1 to 7, formed by the transport lever 59, the transport spring 61 and the cam segment 63, an eccentric drive is formed simply according to FIG. 8 in that the transport spring 61 is eccentrically connected to a ratchet wheel 91 that is firmly connected to the portioning roller 1 is attached. This eccentric drive has the same effect that the portioning roller 1 is rotated by an angle immediately after the material web 39 on the knife 12 has been cut off, which is determined by the length of the guide 3 measured in the circumferential direction. As a result, a new section of the web of material 39 is moved forward such that, similar to that shown in FIG. 6, it hangs down out of the housing 42 and is easily gripped.

In the ratchet wheel 91 engages a resilient pawl 92 such that the portioning roller 1 can not turn backwards.

Claims (8)

Dispenser for dispensing sections of a material web (39) from a dispensing roll (38), with - a housing (42) which has a roll holder for the dispensing roll (38) and a discharge opening (55), a fixed knife (12) which protrudes from the discharge opening (55), a portioning roller (1) which is mounted in the housing (42) on the path of the material web (39) from the dispensing roller (38) to the dispensing opening (55) and can be rotated step by step, - A control lever (15) through which the portioning roller (1) can be stopped in a certain angular position in order to define a section length of the material web (39), and - A cover strip (10), which normally covers the knife (12), can be moved away from the knife (12) by pulling on the material web (39) and is connected to the control lever (15) in such a way that it controls the portioning roller (1) releases after each separation of the material web (39). Dispenser according to claim 1,
characterized in that the cover strip (10) is attached to a support arm (9) of the control lever (15). Dispenser according to claim 2,
characterized in that the control lever (15) has a stop arm (6) and is normally held by a return spring (13) in a position in which a stopper (17) arranged on the portioning roller (1) abuts the stop arm (6) . Dispenser according to claim 3,
characterized in that the control lever (15) further has a guide arm (5) which engages in each case in a guide (3) formed on the portioning roller (1) and permits a limited rotation of the portioning roller (1) when the control lever (15) by a force exerted by the material web (39) on the cover strip (10) against the force of the return spring (13) into a position in which the stop arm (6) releases the stopper. Dispenser according to claim 4,
characterized in that the guide (3) is designed as a U-shaped groove on an end face (43) of the portioning roller (1). Dispenser according to claim 4 or 5,
characterized in that the portioning roller (1) is connected to an eccentric drive which converts the force of a transport spring (61) into a moment rotating the portioning roller (1) when the guide arm (5) engages in the guide (3). Dispenser according to one of claims 1 to 6,
characterized in that the control lever (15) is assigned two cover strips (10, 90), between which the knife (12) is arranged. Dispenser according to claim 7,
characterized in that the control lever (15) has a pivot axis (7) parallel to the portioning roller (1) and the knife (12) and the two cover strips (10, 90) are coaxially curved about the pivot axis (7).

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