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(11) | EP 3 525 643 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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PAPER TOWEL DISPENSER DAMPING SYSTEM DÄMPFUNGSSYSTEM FÜR PAPIERHANDTUCHSPENDER SYSTÈME D'AMORTISSEMENT POUR DISTRIBUTEUR DE SERVIETTES EN PAPIER |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] This invention relates to dispenser apparatus for dispensing paper toweling and more particularly to structure for damping forces applied to a roll a toweling when overspin slack is taken up.
[0002] This invention relates to dispenser apparatus according to claim 1 for dispensing paper toweling from a roll and for applying damping forces to the paper toweling when overspin shock is taken up during pulling of the paper toweling during dispensing, said dispenser apparatus comprising:
a housing;
a roll support connected to said housing for mounting the roll of paper toweling and permitting rotation of the roll of paper toweling during dispensing;
a rotatable toweling support roller spaced from said roll support, the rotatable toweling support roller receiving paper toweling from said roll of paper toweling and operable upon rotation to dispense said paper toweling;
a pivoting paper guide extending partially around said rotatable toweling support roller and defining a paper path for the paper toweling about a portion of the rotatable toweling support roller;
a nip roller supported by said pivoting paper guide; and
a spring structure operatively connected to said pivoting paper guide to exert a biasing force on said pivoting paper guide and form a nip between said damping nip roller and said rotatable toweling support roller accommodating the paper toweling;
said pivoting paper guide and said nip roller moving away from said rotatable toweling support roller.
[0003] US 6,363,824 B1 discloses a machine for dispensing paper wipes, paper hand wipes and toilet paper. The machine includes a swinging gantry devised to accommodate a pinch roller which is capable of being in contact with a reel in order to contribute towards tensioning the paper, by exerting a pressure and braking force on the reel in opposition to the pulled paper and in order to facilitate and allow cutting of the paper by a cutting device built into a drum. The machine further includes a flap that supports a pressure roller, the flap being hinged so that it swivels in opposition to return springs and relative to the gantry. Gradual paying out of the reel causes the gantry to rise gradually and the pinch roller continues to push constantly against the reel, thus preventing the formation of any loop and also braking the paper so that it can be cut. In this configuration, the strip of dispensed paper is braked by both the force exerted by the pinch roller on the reel and that exerted by the pressure roller against the drum, thereby controlling tensioning of the paper and ensuring that the paper is cut properly and preventing the formation of any loops.
[0004] Another type of the dispensing apparatus is shown in US 2016/0262581 A1. A rolled product dispenser for dispensing a web of rolled product comprises a housing and a dispensing assembly at least partially housed in the housing. The dispensing assembly interacts with the web of rolled product and includes a dispensing roller having a rotation center and a peripheral wall with an upper section. The dispensing can assembly can comprise an upper tensioning assembly and/or a lower tensioning assembly and/or a variable tension return assembly.
[0005] The problem with a dispenser apparatus for dispensing paper toweling from a role is to structure for damping forces applied to a roll of toweling when overspin slack is taken up. The term "paper toweling" as employed herein also encompasses tissue and the teachings of this invention are applicable to dispensing from rolls of paper tissue.
[0006] The present invention addresses certain problems, including the problem of "tabbing" occurring during use of a paper towel dispenser. Tabbing occurs when a piece of towel tears off the sheet when a user grasps and pulls the paper. Tabbing may occur with one or two hand pulls. Papers that absorb water at the greatest rate are most likely to tab. The rate of water absorbency varies by paper manufacturer and grade. Premium grade papers tend to absorb water the quickest and are generally harder to cut which leads to a higher rate of tabbing.
[0007] It has been found that tabbing occurs when overspin slack is taken up and/or when a blade on the dispenser is utilized to cut the paper. A "shock" is present at the moment the overspin slack is exhausted. The shock occurs because the stationary roll towel must begin rotating at the moment that the overspin slack is exhausted. The shock is greatest with full rolls and diminishes as the roll is exhausted. US-PS 7,500,420 discloses an approach for addressing the "tabbing" problem.
[0008] Another potential problem is the accumulation of toweling wrinkles caused by overspin which can interfere with cutting of the toweling.
[0009] It is an object of the present invention to deal with the problems of "tabbing" and toweling wrinkling, as well as reducing the chance of toweling accumulating on a toweling support roller during dispensing.
[0010] The object of the invention is solved in that the nip roller is a damping nip roller; in that said pivoting paper guide and said damping nip roller are providing a damping action when sufficient tensioning forces are produced in the paper toweling between the damping nip roller and the rotatable paper toweling support roller during pulling of the paper toweling; the object of the invention is solved by the apparatus of claim 1.
[0011] The invention is characterized by its simplicity, reliability and effectiveness of operation.
[0012] In the invention, a damping nip roller is rotatably mounted on a pivoting paper guide of a paper guide assembly to dampen shock force that occurs when overspin slack is fully consumed. The paper guide assembly improves cutting by preventing accumulation of toweling wrinkles.
[0013] This arrangement also creates nearly 270 degrees of wrap on the toweling support roller which further improves the ability to cut a variety of toweling types by reducing chance for toweling to slip on the toweling support roller.
[0014] A two stage spring action is incorporated in the apparatus - coil springs and plastic springs. After initial damping begins, plastic springs that are integrated into the pivoting paper guide engage a fixed mechanism feature to apply additional spring force and increase damping.
[0015] Other features, advantages and objects of the present invention will become apparent with reference to the following description and accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
[0016]
Fig. 1 illustrates a toweling support roller of a paper towel dispenser, a damping nip roller and pivoting paper guide of the paper guide assembly, the damping nip roller being in natural resting position against the toweling support roller;
Fig. 2 is a view similar to Fig. 1, but illustrating the damping nip roller and pivoting paper guide at maximum travel position to provide maximum damping;
Fig. 3 is an enlarged, sectional view of the component arrangement of Fig. 1, as taken along the section plane 3-3 shown in Fig. 8;
Fig. 4 is a view similar to Fig. 3, but illustrating the relative positioning of the damping nip roller and pivoting paper guide relative to the toweling support roller to provide maximum damping as illustrated in Fig. 2;
Fig. 5 is a frontal, perspective view of the rear housing portion of the paper towel dispenser illustrating the damping nip roller in the position shown in Fig. 1;
Fig. 6 is an exploded, perspective view of the structural components illustrated in Fig. 5;
Fig. 7 is an enlarged, side sectional view showing toweling from a roll of toweling passing about the damping nip roller and about the toweling support roller to a dispenser exit, the damping nip roller and pivoting paper guide at a point of operation where plastic spring action of the damping assembly begins;
Fig. 8 shows the section view plane for Figs. 3, 4 and 7; and
Fig. 9 is a perspective view of the damping nip roller and pivoting paper guide as viewed from underneath and illustrating paper guide ribs on the pivoting paper guide employed to create the paper path for the paper toweling about the toweling support roller.
BEST MODE FOR CARRYING OUT THE INVENTION
[0017] Referring now to the drawings, a rear housing portion of a paper toweling dispenser incorporating the teachings of the present invention is illustrated, the housing portion being designated by reference numeral 10. As is conventional, the dispenser incorporates two support arms 12 which are used to rotatably support a roll of paper toweling to be dispensed. Fig. 7 illustrates a paper toweling roll 14.
[0018] As is also conventional, the illustrated toweling dispenser includes a toweling support roller 20 which rotates during the dispensing operation and the toweling exits a dispensing opening 22. In the arrangement illustrated a retractable cutter blade 24 is operatively associated with the toweling support roller similar to the arrangement disclosed in above-referenced U.S. Patent No. 7,500,420.
[0019] Incorporated in the dispenser is a damping assembly which includes a damping nip roller 32 and a pivoting paper guide 34. The damping nip roller 32 is rotatably supported at the distal or outer end of the pivoting paper guide.
[0020] As perhaps may best be seen with reference to Fig. 9, ribs 36 are located on the curved underside of the pivoting paper guide. Pivot pins 44 pivotally attach the pivoting paper guide 34 to side panels of the housing portion 10, the pivot pins positioned at the distal end portions of elongated members or arms 42 of the pivoting paper guide.
[0021] Stub shafts 40 are attached to ends of coiled springs 46, the other ends of the springs 46 being connected to the housing portion 10. The springs 46 exert a downward force on the arms 42 and the pivoting paper guide 34 is biased so that the damping nip roller 32 engages paper toweling support roller 20 when no paper toweling is disposed therebetween. This is the condition shown in Figs. 1 and 3 for example. When however a tensional force is exerted on the toweling between the damping nip roller and toweling support roller sufficient tension in the toweling will pivot the pivoting paper guide and raise the damping nip roller upwardly as shown in Figs. 4 and 7, for example, so that it provides a damping action with respect to the paper toweling.
[0022] An inventive feature of this invention relates to the use of flexible plastic springs incorporated in the pivoting paper guide 34 to engage a fixed mechanism feature to apply additional spring force to the pivoting paper guide. Fig. 7 illustrates by means of an arrow the distal ends of the plastic springs 54 which in this embodiment are extensions of some of the ribs 36.
[0023] The distal ends of the plastic springs 54 are positioned in recesses 56 which are defined by a fixed paper guide 58. Fixed paper guide 58 is a component of the damping assembly of this invention, along with the damping nip roller 32 and pivoting paper guide 34. Fixed paper guide 58 is attached to the housing side panels. The pivoting paper guide isn't directly connected to the fixed paper guide until the plastic springs contact the fixed paper guide during the damping phase.
[0024] Figs. 2 and 4 illustrate the condition of the structural features of the damping assembly in the relative positions assumed thereby with respect to the toweling support roller at maximum damping when the plastic springs 54 are being flexed due to engagement with the fixed paper guide 58 at the location of recesses 42. Engagement is at an upper portion of the fixed paper guide defining the recesses 56.
[0025] The damping nip roller integrated into the pivoting paper guide 34 will dampen shock force that occurs when overspin slack is fully consumed. The integrated pivoting paper guide 34 and fixed paper guide 58 improve blade cutting by preventing accumulation of toweling wrinkles. This arrangement also creates nearly 270 degrees of wrap on the toweling support roller between nip roller 32 and a second nip roller adjacent to the inner end of the fixed paper guide 58 which further improves the ability to cut a variety of toweling types by reducing the chance for toweling slippage on the toweling support roller. A two stage spring action is incorporated by the use of coil springs and plastic springs and after initial damping begins plastic springs that are integrated into the pivoting paper guide engage a fixed mechanism (the lead end of the fixed paper guide) to apply additional spring force to the damping assembly as discussed above.
a housing (10);
a roll support ( 12) connected to said housing ( 10) for mounting the roll of paper toweling (14) and permitting rotation of the roll of paper toweling (14) during dispensing;
a rotatable toweling support roller (20) spaced from said roll support (12), the rotatable toweling support roller (20) receiving paper toweling from said roll of paper toweling (14) and operable upon rotation to dispense said paper toweling;
a pivoting paper guide (34) extending partially around said rotatable toweling support roller (20) and defining a paper path for the paper toweling about a portion of the rotatable toweling support roller (20);
a nip roller (32) supported by said pivoting paper guide (34);
and a spring structure operatively connected to said pivoting paper guide (34) to exert a biasing force on said pivoting paper guide (34) and form a nip between said nip roller (32) and said rotatable toweling support roller (20) accommodating the paper toweling;
said pivoting paper guide (34) and said nip roller (32) configured to be moved away from said rotatable toweling support roller (20);
characterized in that the nip roller (32) is a damping nip roller;
in that said pivoting paper guide (34) and said damping nip roller (32) provide a damping action when tensioning forces of predetermined magnitude are produced in the paper toweling between the damping nip roller (32) and the rotatable paper toweling support roller (20) during pulling of the paper toweling;
and in that said spring structure includes a first spring structure (46) and a second spring structure (54), said second spring structure operable to exert a biasing force after a biasing force has been exerted by said first spring structure.
additionally including a curved fixed paper guide (58), said curved fixed paper guide (58) positioned adjacent to the pivoting paper guide (34), said paper toweling forming a wrap of about 270 degrees about the toweling support roller (20) and extending under and beyond ends of the said curved fixed paper guide (58) and said pivoting paper guide (34).
wherein said first spring structure extends between said pivoting paper guide (34) and said housing (10).
wherein said first spring structure includes at least one coiled spring (46).
wherein pivot pins (44) spaced from said at least one coiled spring (46) connect said pivoting paper guide (34) to the housing (10).
wherein said second spring structure is located at a location of interconnection between said pivoting paper guide (34) and said curved fixed paper guide (58).
wherein said second spring structure comprises at least one flexible plastic spring (54).
wherein said at least one flexible plastic spring (54) is positioned in a recess (56) defined by said curved fixed paper guide (58).
wherein said pivoting paper guide (34) includes elongated members extending into engagement with said fixed paper guide (58), a distal end of at least one of said members comprising said at least one flexible plastic spring (54).
wherein said damping nip roller (32) and a second nip roller are defining the wrap on the rotatable toweling support roller of about 270 degrees.
wherein said pivoting paper guide (34) isn't directly connected to said fixed paper guide (58) until plastic springs (54) contact the fixed paper guide (58) during a damping phase.
wherein said second spring structure comprises a plurality of flexible plastic springs (54) with distal ends incorporated in the pivoting pager guide (34) and positioned within recesses (56) defined by the fixed paper guide (58.
wherein ribs (36) are located on the curved underside of the pivoting paper guide (34.
wherein stub shafts (40) are attached to ends of coiled springs (46), the other ends of the springs (46) being connected to the portions of said housing (10).
wherein the damping nip roller (32) is rotatably supported at the distal or outer end of the pivoting paper guide (34).
ein Gehäuse (10);
einen Rollenträger (12), der mit dem Gehäuse (10) verbunden ist, um die Papierhandtuchrolle (14) zu befestigen und die Drehung der Papierhandtuchrolle (14) während der Ausgabe zu ermöglichen;
eine drehbare Handtuchträgerrolle (20), die von der Rollenhalterung (12) beabstandet ist, wobei die drehbare Handtuchträgerrolle (20) Papierhandtuch von der Papierhandtuchrolle (14) aufnimmt und bei Drehung betätigt werden kann, um das Papierhandtuch auszugeben;
eine schwenkbare Papierführung (34), die sich teilweise um die drehbare Handtuchträgerrolle (20) herum erstreckt und einen Papierweg für das um einen Abschnitt der drehbaren Handtuchträgerrolle (20) herumtransportierte Papier definiert;
eine Andruckrolle (32), die von der schwenkbaren Papierführung (34) getragen wird;
und eine Federstruktur, die funktionell mit der schwenkbaren Papierführung (34) verbunden ist, um eine Vorspannkraft auf die schwenkbare Papierführung (34) auszuüben und einen Walzenspalt zwischen der Andruckrolle (32) und der drehbaren Handtuchträgerrolle (20) zu bilden, die das Papierhandtuch aufnimmt;
die schwenkbare Papierführung (34) und die Andruckrolle (32) so konfiguriert sind, dass sie von der drehbaren Handtuchträgerrolle (20) weg bewegt werden können;
dadurch gekennzeichnet, dass die Andruckrolle (32) eine Dämpfungsandruckrolle ist;
dass die schwenkbare Papierführung (34) und die Dämpfungsandruckrolle (32) eine Dämpfungswirkung bereitstellen, wenn in dem Papiertuch zwischen der Dämpfungsandruckrolle (32) und der drehbaren Handtuchträgerrolle (20) während des Ziehens des Papiertuchs Spannkräfte einer vorbestimmten Größe erzeugt werden;
und dass die Federstruktur eine erste Federstruktur (46) und eine zweite Federstruktur (54) umfasst, wobei die zweite Federstruktur betreibbar ist, um eine Vorspannkraft auszuüben, nachdem eine Vorspannkraft durch die erste Federstruktur ausgeübt worden ist.
zusätzlich eine gekrümmte feststehende Papierführung (58) aufweist, wobei die gekrümmte feststehende Papierführung (58) neben der schwenkbaren Papierführung (34) angeordnet ist, wobei das Papierhandtuch eine Umschlingung von etwa 270 Grad um die Handtuchträgerrolle (20) bildet und sich unter und über die Enden der gekrümmten feststehenden Papierführung (58) und der schwenkbaren Papierführung (34) hinaus erstreckt.
wobei sich die erste Federstruktur zwischen der schwenkbaren Papierführung (34) und dem Gehäuse (10) erstreckt.
wobei die erste Federstruktur mindestens eine Spiralfeder (46) umfasst.
wobei Schwenkstifte (44), die von der mindestens einen Spiralfeder (46) beabstandet sind, die schwenkbare Papierführung (34) mit dem Gehäuse (10) verbinden.
wobei die zweite Federstruktur an einer Verbindungsstelle zwischen der schwenkbaren Papierführung (34) und der gekrümmten festen Papierführung (58) angeordnet ist.
wobei die zweite Federstruktur mindestens eine flexible Kunststofffeder (54) umfasst.
wobei die mindestens eine flexible Kunststofffeder (54) in einer Aussparung (56) angeordnet ist, die durch die gekrümmte feste Papierführung (58) definiert ist.
wobei die schwenkbare Papierführung (34) längliche Elemente aufweist, die sich in Eingriff mit der festen Papierführung (58) erstrecken, wobei ein distales Ende von mindestens einem der Elemente die mindestens eine flexible Kunststofffeder (54) aufweist.
wobei die dämpfende Andruckrolle (32) und eine zweite Andruckrolle die Umschlingung auf der drehbaren Handtuchträgerrolle von etwa 270 Grad definieren.
wobei die schwenkbare Papierführung (34) nicht direkt mit der festen Papierführung (58) verbunden ist, bis Kunststofffedern (54) die feste Papierführung (58) während einer Dämpfungsphase berühren.
wobei die zweite Federstruktur eine Vielzahl von flexiblen Kunststofffedern (54) umfasst, deren distale Enden in die schwenkbare Pager-Führung (34) integriert und in Aussparungen (56) positioniert sind, die durch die feste Papierführung (58) definiert sind.
wobei sich an der gekrümmten Unterseite der schwenkbaren Papierführung (34) Rippen (36) befinden.
wobei Achsstummel (40) an Enden von Spiralfedern (46) befestigt sind und die anderen Enden der Federn (46) mit den Teilen des Gehäuses (10) verbunden sind.
wobei die dämpfende Andruckrolle (32) am distalen oder äußeren Ende der schwenkbaren Papierführung (34) drehbar gelagert ist.
un boîtier (10) ;
un support de rouleau (12) relié audit boîtier (10) pour monter le rouleau de matériau absorbant en papier (14) et permettre la rotation du rouleau de matériau absorbant en papier (14) lors de la distribution ;
un rouleau de support de matériau absorbant rotatif (20), espacé dudit support de rouleau (12), le rouleau de support de matériau absorbant rotatif (20) recevant du matériau absorbant en papier dudit rouleau de matériau absorbant en papier (14) et pouvant fonctionner lors de la rotation pour distribuer ledit matériau absorbant en papier ;
un guide de papier pivotant (34) s'étendant partiellement autour dudit rouleau de support de matériau absorbant rotatif (20) et définissant un trajet de papier pour le matériau absorbant en papier autour d'une partie du rouleau de support de matériau absorbant rotatif (20) ;
un rouleau de pincement (32) supporté par ledit guide de papier pivotant (34) ;
et une structure de ressort reliée de manière opérationnelle audit guide de papier pivotant (34) afin d'exercer une force de sollicitation sur ledit guide de papier pivotant (34) et de former une zone de pincement entre ledit rouleau de pincement (32) et ledit rouleau de support de matériau absorbant rotatif (20) recevant le matériau absorbant en papier ;
ledit guide de papier pivotant (34) et ledit rouleau de pincement (32) étant conçus pour être éloignés dudit rouleau de support de matériau absorbant rotatif (20) ;
caractérisé en ce que le rouleau de pincement (32) est un rouleau de pincement d'amortissement ;
en ce que ledit guide de papier pivotant (34) et ledit rouleau de pincement d'amortissement (32) assurent une action d'amortissement lorsque des forces de tension d'une magnitude prédéterminée sont produites dans le matériau absorbant en papier entre le rouleau de pincement d'amortissement (32) et le rouleau de support de matériau absorbant en papier rotatif (20) lors de la traction du matériau absorbant en papier ;
et en ce que ladite structure de ressort comporte une première structure de ressort (46) et une deuxième structure de ressort (54), ladite deuxième structure de ressort pouvant fonctionner pour exercer une force de sollicitation après qu'une force de sollicitation a été exercée par ladite première structure de ressort.
comportant de plus un guide de papier fixe incurvé (58), ledit guide de papier fixe incurvé (58) étant positionné en position adjacente au guide de papier pivotant (34), ledit matériau absorbant en papier formant un enroulement d'environ 270 degrés autour du rouleau de support de matériau absorbant (20) et s'étendant sous et au-delà des extrémités dudit guide de papier fixe incurvé (58) et dudit guide de papier pivotant (34).
ladite première structure de ressort s'étendant entre ledit guide de papier pivotant (34) et ledit boîtier (10).
ladite première structure de ressort comportant au moins un ressort enroulé (46).
des broches de pivotement (44) espacées dudit au moins un ressort enroulé (46) reliant ledit guide de papier pivotant (34) au boîtier (10).
ladite deuxième structure de ressort étant située à un emplacement d'interconnexion entre ledit guide de papier pivotant (34) et ledit guide de papier fixe incurvé (58).
ladite deuxième structure de ressort comprenant au moins un ressort plastique souple (54).
ledit au moins un ressort plastique souple (54) étant positionné dans un renfoncement (56) défini par ledit guide de papier fixe incurvé (58).
ledit guide de papier pivotant (34) comportant des éléments allongés s'étendant en prise avec ledit guide de papier fixe (58), une extrémité distale d'au moins l'un desdits éléments comprenant ledit au moins un ressort plastique souple (54).
ledit rouleau de pincement d'amortissement (32) et un deuxième rouleau de pincement définissant l'enroulement sur le rouleau de support de matériau absorbant rotatif d'environ 270 degrés.
ledit guide de papier pivotant (34) n'étant pas directement relié audit guide de papier fixe (58) jusqu'à ce que des ressorts plastiques (54) entrent en contact avec le guide de papier fixe (58) lors d'une phase d'amortissement.
ladite deuxième structure de ressort comprenant une pluralité de ressorts plastiques souples (54) avec des extrémités distales incorporées dans le guide de papier pivotant (34) et positionnées à l'intérieur de renfoncements (56) définis par le guide de papier fixe (58).
des nervures (36) étant situées sur le dessous incurvé du guide de papier pivotant (34).
des bouts d'arbre (40) étant fixés à des extrémités de ressorts enroulés (46), les autres extrémités des ressorts (46) étant reliées aux parties dudit boîtier (10).
le rouleau de pincement d'amortissement (32) étant supporté de manière rotative au niveau de l'extrémité distale ou externe du guide de papier pivotant (34).
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description