EP0468013B1 - Device for issuing web sections - Google Patents

Abstract

PCT No. PCT/EP91/00245 Sec. 371 Date Oct. 1, 1991 Sec. 102(e) Date Oct. 1, 1991 PCT Filed Feb. 8, 1991 PCT Pub. No. WO91/11946 PCT Pub. Date Aug. 22, 1991.In an apparatus for paying out web sections (50), comprising a dispenser roll (38) and a supply roll (40), a feeler (31) resting on the dispenser roll (38) determines the diameter thereof and, by way of levers, unlocks a detent (28) or a protrusion (78) disposed at a swinging plate (27) which carries the bearings (24). Hereby the swinging plate (27) is swung by a spring (48, 79) and thus the supply roll (40) resting on the bearing (24) is pressed against the paper web (39) withdrawn from the dispenser roll (38) and, together with it, against the toothed roller (21). Hereby the last rest of paper from the dispenser roll (28) is pulled off simultaneously with the leading end (41) of the web from the supply roll (40).

Description

The invention relates to a device for dispensing web sections, in particular paper towels from a dispensing roll with automatic switching of the dispensing to a supply roll when the dispensing roll is exhausted, in which a spring-loaded button in contact with the material web of the dispensing roll detects the presence of the material web of the dispensing roll and in the absence thereof via a lever construction, the end of the material web of the dispensing roller presses against the beginning of the material web of the supply roll and jointly feeds both material webs to a pressure roller and the counter roller which is in engagement with it.

Reel sheet dispensers are known in a variety. In addition to the dispensers of wiping or cleaning towels, the dispensers in front of towels have the greatest importance, which is why the invention is to be dealt with below using the example of a towel dispenser, but without restricting it to them.

Towel dispensers that are equipped with a supply roll and that use the supply roll on the first roll when the paper supply is exhausted are known from US Pat. No. 4,236,679, EP-OS 319 166, EP-OS 235 446 and DE- OS 28 12 756 known. According to US Pat. No. 4,236,679, it is proposed to arrange the material rollers one above the other on articulated suspension levers, as a result of which they are in contact with one another and to support the lower roller on a transport roller. After the lower material web roller has been exhausted, the bearing levers swing back and the reserve roller moves into place first output roll. However, it is not ensured that the beginning of the web of the spare roll also emerges from the dispenser downwards.

EP-OS 319 166 provides for the delivery of web material by means of a toothed surface-operated sliding surface, around which the material of the first roll is looped and leads to the removal opening. At the same time, the beginning of the web of the second roll is placed on the sliding surface and pressed onto the transport roll with a pressure plate. The pressure plate has notches, by which the start of the web of the second paper roll is held. If the first paper roll has been unwound, the greater friction of the transport roll increases the frictional resistance between the start of the web of the second paper roll and the transport roll, as a result of which the paper is pulled over the catches and reaches the outlet opening. However, since the friction can fluctuate considerably depending on the type of paper loaded, it cannot be guaranteed that as long as paper remains on the first roll Output is located, is not already deducted from the second roll of paper. Two sheets can therefore be output, which means that the consumption of paper doubles.

EP-OS 235 446 shows a switching mechanism in which a sensor, which is connected to a lever system, scans the diameter of the first roller and, with increasing diameter reduction, a pressure roller of the transport roller, via which the paper is passed, via the lever system, feeds. Below the pressure roller, the web start of the reserve roller is stored at a fixed point, which is then pressed onto the transport roller when the first roller has essentially been unwound, as a result of which material can be unwound from the reserve roller.This construction does not ensure that the At the beginning of the path of the reserve roll, it is also not ensured that it is not unintentionally pulled off with the first path.

DE-OS 28 12 756 describes a towel dispenser according to the preamble of claim 1, in which the first paper roll is arranged above the spare roll, the web to be pulled off being guided along a spring-loaded sensor between two rollers held at a distance to a transport and Counter-pressure roller and is guided from this to the exceptional opening The web to be dispensed is kept under tension between the first roller and the transport roller, and the beginning of the web of the second paper roller is introduced into the nip. A roller of the rollers forming the nip is on the feeler lever stored. If the paper web between the first roll and the pressing or sliding surface is missing, a spring presses the sensor in the direction of the empty winding tube of the first paper roll and thus presses the end of the web of the first paper roll in the nip against the beginning of the web of the second paper roll, which is thereby also removed can. The disadvantage here is that the pressure in the nip must be relatively high so that the second paper web is taken along. This in turn means that only very tear-resistant paper can be used, since the sensor only keeps the nip open when it is pressed back against the spring force by the first paper web. The nature of the paper already changes as a result of moisture from the atmospheric moisture, ie it expands so that the original tension of the web is no longer present, the sensor is pressed by the spring in the direction of the first paper roll, so that the nip is inadvertently reduced and the simultaneous output of paper from the second roll is started.

The object of the present invention is to avoid the disadvantages described above.

In a device for dispensing web sections, in particular paper towels from a dispensing roll with automatic changeover of the dispensing to a supply roll when the dispensing roll is exhausted, in which a button under spring tension in contact with the material web of the dispensing roll detects the presence of the material web of the dispensing roll and detects it Missing over one Lever construction presses the end of the material roll of the dispensing roller against the beginning of the material web of the supply roll and together feeds both material webs to a pressure roller and the counter roller in engagement with it, this task is solved by the combination of the following features:
the button rests on the delivery roller and unlocks a catch or a projection of a swivel plate via lever,
the swivel plate carries a bearing and can be moved around a swivel pin by means of a spring, the spring rotates the swivel plate with the supply roll resting on the bearing against a sprocket, the sprocket presses the end of the material roll of the delivery roll against the start of the supply roll.

During the unwinding process of the paper web from the delivery roll, which is arranged as the first roll above the supply roll, the paper web to be drawn off is guided along the supply roll at a distance from the toothed roll. During this time, the supply roll is blocked by a brake according to a preferred embodiment of the invention, and thus unwinding of the paper is reliably prevented. If the dispenser roll is unwound to a few layers, a lever mechanism releases the locking mechanism of a swivel plate that carries a bearing of the supply roll, the swivel plate with the bearing and supply roll is pressed by spring force against the paper web pulled off the dispenser roll and with it against the sprocket and comes out of the engagement of the brake by this movement. By further pulling the paper web off the first roll, i.e. the Dispensing roll, the supply roll, which is now no longer blocked, is rotated, ie the beginning of the web of the supply roll is unwound with the paper web of the dispensing roll, fed to the portioning roll via a pressure roll and drawn off therefrom. Until the paper on the delivery roll is completely used up, two to four web sections are dispensed, which are double-layered, which is necessary for the safety of the functioning of the dispenser.

Advantageous refinements of the invention provide that the button is pressed onto the dispensing roller by means of a button spring, the button being expediently connected to a holding rod by means of a hinge pin.

The spring that presses the button on the delivery roller is also the actuator for the handrail, d. H. it pulls the support rod upwards as the diameter of the dispensing roller decreases, so that the end of the support rod approaches the support rod guide and thus releases the catch of the swivel plate. Only after the release can the supply roll be pivoted and thus the output of web sections can be switched from the delivery roll to the supply roll.

An alternative solution for the combination push button / handrail / catch provides that the push button consists of a flat profile, which is on the dispenser roll has overlying slider and engages via a pin in a control fork of an L-profile, the L-profile is expediently pivoted about a bearing pin and can be in engagement with the projection of the pivot plate. In this construction, too, the button scans the roller diameter of the discharge roller, the slide piece resting on the discharge roller. With decreasing diameter of the discharge roller, the button moves in the direction of the roller center, whereby the pin opposite the slide in the control fork of the L-profile swivels the L-profile, so that the projection of the swivel plate no longer matches the L-profile when the discharge roller is practically unwound communicates. This results in the same solution, ie the supply roll releases from the brake and is pressed against the toothed roll, whereby the delivery of web sections from the supply roll is initiated.

Fig. 1

zeigt die perspektivische Darstellung eines Handtuchrollenspenders,

Fig. 2

in vergrößerter, teilweiser Seitenansicht von rechts zwei übereinander angeordnete Spenderrollen,

Fig. 3

den Abschneidemechanismus der Papierbahn,

Fig. 4

und

Fig. 5

im Detail ein Klapplager,

Fig. 6

eine Seitenansicht des Spenders von links,

Fig. 7

die Vorderansicht des Spenders,

Fig. 8

die Seitenansicht des Spenders von rechts,

Fig. 9

eine alternative Lösung zu Fig. 8.

The invention is described below with reference to the drawings.

Fig. 1

shows the perspective view of a towel roll dispenser,

Fig. 2

in an enlarged, partial side view from the right, two dispenser rolls arranged one above the other,

Fig. 3

the cutting mechanism of the paper web,

Fig. 4

and

Fig. 5

in detail a folding storage,

Fig. 6

a side view of the dispenser from the left,

Fig. 7

the front view of the dispenser,

Fig. 8

the side view of the donor from the right,

Fig. 9

an alternative solution to FIG. 8.

A portioning roller (1), which is provided with a friction lining (2), is arranged in the lower region of the sheet dispenser. The end faces of the portioning roller (1) have a spiral guide (3), in each of which a nose (5) of a slide (6) engages. The slider (6) engages with its slot (7) the shaft (8) of the portioning roller (1). If the portioning roller (1) is moved clockwise by pulling the paper web (39), the nose (5) slides in the spiral guide (3) and thereby moves the slide (6).

The slide (6), which is knee-shaped in its lower region, has a joint (11) at the end opposite the nose (5), which connects it to the knife (12) and the knife lever (14) Bearing blocks (81) of the portioning roller (1) is articulated and connects the recess (65) in the bearing blocks (81). The rear portion of the knife (12), which is designed as a toothed knife blade, projects beyond the joint (11) and there has knife bolts (45) which engage in the forks (9) of the release anchor (10).

The release anchor (10), which is articulated to the slide (6) via a stud bolt (44), has a stop surface (17) on the outside of an anchor surface and the inner stop surface (82) on the inside of the other anchor surface. When the paper web (39) is pulled off over the portioning roller (1), it is rotated. The stops (18) arranged on their end faces (43) abut against the stopper surfaces (17) Release anchors (10) which interact with both end faces (43). In this stop position of the portioning roller (1) a length of web has been unwound, at the same time the slide (6) has moved to its outermost position, as a result of which the knife (12) has been brought outwards and thus into the area of the removed paper web (39). The knife (12) is now in engagement with the paper web (39), by further pulling the paper web (39) is cut through and releases the web section (50), at the same time the knife is counter to the spring force direction of the knife spring (13) until it stops moved to a backstop (42), whereby the release armature (10) is rotated about the stud bolt (44) via the knife bolt (45) engaging in the fork (9) of the release armature (10), so that the stopper surface (17) moves away from it Lift off the stop (18). The knife (12) is locked in this position on the backstop (42) and is only retracted by the knife spring (13) when the web section (50) has been cut off, that is, no more tension is exerted on the knife (12). A spring-operated feed to be explained later rotates the portioning roller (1) clockwise by a few degrees until the stop (18) lies against the inner stop surface (82) and locks the portioning roller (1) a second time, thereby creating a new piece the paper web (39) is guided out of the dispenser so that it can be gripped by hand. Simultaneously with this rotation, the nose (5) is guided in the spiral guide beyond the shoulder (4) and the knife (12) releases the knife (12) from the stopper (42). So that the nose (5) by the return spring (15), the Legs (16) of the knife lever (14) attacks, returned to their starting position, so that the knife (12) is retracted.

The paper web (39) is located on a delivery roller (38) which is arranged in the upper region of the dispenser and rests on bearing stumps (26). The bearing stump (26) consists of a downwardly sloping pipe section and is an integral part of a folding bearing (24) which is pressed by means of a pressure spring (25) through the right or left inner wall (56), (57) of the dispenser and with it is connected to the folding pin (23) in and out. The folding pin (23) is received by eye bearings (66) which are arranged on the inner walls (56, 57).

The space between the inner walls (56) and (57) corresponds to the width of the discharge roller (38). If the dispensing roller (38) is used, this is done from below, i.e. along the slope (47) of the bearing stumps (26), which fold outwards until the winding tube (76) of the dispensing roller (38) is reached, i.e. up to the time when the pressure spring (25) press the bearing stumps (26) into the winding tube (76) of the dispensing roller (38). The diameter of the delivery roller (38) is limited by a limiter (51) arranged in the rear wall (53) such that only delivery rollers (38) with a defined maximum diameter can be used.

On the delivery roller (38) there is a button (31) which is mounted in a bearing pin (32) and by means of a key spring (33) is held in the support position. A hinge pin (30) connects the handrail (29) to the button (31) and is guided in a handrail guide (49). The lower area engages with the catch (28) of a swivel plate (27), which can be moved around the swivel pin (22) and carries a folding bearing (24). By pulling the paper web (39) from the dispensing roller (38), its diameter is reduced, so that the button (31) moves continuously downwards and thus the holding rod (29) is pulled upwards until the dispensing roller (38) is almost empty. the holding rod (29) releases the catch (28) and the swivel plate spring (48) moves the swivel plate (27) and thus the folding bearing (24) in the direction of the toothed roller (21).

The supply roll (40) rests on both sides in folding bearings (24). However, one of these folding bearings (24) is located on the swivel plate (27), that is to say that the supply roll is offset on one side by the swivel plate spring (27) against the sprocket (21) which is mounted in the sprocket block (46). The brake (20) is no longer in engagement with the circumference of the supply roll (40) so that it can rotate freely. The toothed roller (21) presses the paper web (39) coming from the delivery roller (38) against the supply roll (40), so that the beginning of the web (41) unwinds from the supply roll (40) when the paper web (39) is drawn off Pressure rollers (19) reached and passed over the portioning roller (1) to the dispenser opening (55).

Until the dispensing roll (38) is exhausted, two paper webs are now dispensed simultaneously, i.e. when the paper web (39) is torn off via the knife (12), two sheets are also removed. This doubling of the paper web (39) lasts until the dispensing roll is exhausted, i.e. It is practical that two to five double sheets are issued before the supply roll (40) is used exclusively.

The fill level lever (34), which is held in this position by the fill level spring (36), lies on the supply roll (40) with a fill level sensor (37). In this area, the cover (54) of the dispenser has a fill level window (35) through which the scale (52) of the fill level lever (34) is visible; the fill of the dispenser is thus visible from the outside. The scale (52) is designed so that a warning already appears when 2/3 of the supply roll has been used up. If the container is refilled in this state, the now partially unwound 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.

In a departure from FIGS. 2 to 8, the trigger mechanism for the supply roll (40) is constructed differently in FIGS. 1 and 9. The delivery roller is scanned by a slide (69) resting on the delivery roller (38), which forms an integral part with a flat profile (71), can be rotated about the bolt (70) and a pin (72) on the slide (69) opposite end.

This pin (72) engages in the control fork (73) of an L-profile (74) which is connected to the right inner wall (57) of the dispenser via a bearing pin (75). The front area of the L-profile (74) has a hook stop (77) which engages behind a projection (78) of the folding bearing (24) arranged on the swivel plate (27).

When the paper web (39) is unwound from the dispensing roller (38), its diameter decreases, so that the slide (69) moves in the direction of the winding tube (76). As a result, the flat profile (71) rotates with the pin (72) which moves the control fork (73) in the direction of the rear wall (53) of the dispenser and thereby rotates the L-profile (74) so that the hook stop (77) over the projection (78) is raised. The tension spring (79) connects a point of the right inner wall (57) to the extension arm (80) of the swivel plate (27) or the folding bearing (24) and thereby pulls the supply roll (40) onto the toothed roll (21).

The toothed roller (21) sits on the right side of the cover (54) in a toothed roller block (46), which is an integral part of the cover (54). The lid is mounted in lid bearings (58), which are located in the right and left inner walls (57, 56). In its upper area near the rear wall (53) it has a holding slot (67) into which a resilient hook (68) arranged on the rear wall engages.

The portioning roller (1) is arranged on bearing blocks (81) in the lower region of the cover (54). which is folded forward when the lid (54) is folded down, so that the paper web (39) can be passed comfortably between the pressure rollers (19) and the portioning roller (1) when changing the rollers.

The shaft (8) of the portioning roller (1) reaches through one of the bearing blocks (81) and carries at its outer end a curved segment (63) which has a transport surface (64). The cam segment (63) engages with the sliding surface (60) of the transport lever (59), which is pressed against the cam segment (63) by the transport spring (61). If the paper web (39) is pulled off and the portioning roller (1) is rotated, the cam segment (63) is rotated at the same time, ie the sliding surface (60), which is in the idle state of the portioning roller (1) on the transport surface (64), slides along the circumference of the curve segment (63), moves the transport lever (59) downward and in the process tensions the transport spring (61). The moment the greatest tension of the transport spring (61) is reached, the portioning roller (1) is locked in that the stop surface (17) of the release armature (10) abuts the stop (18) of the portioning roller (1) . After tearing off the paper web (39), the knife (12) tilts back, so that the lock is released, ie the stop (18) and the stopper surface (17) are no longer in engagement. As a result, the sliding surface (60) slides on the transport surface (64), ie the transport spring (61) pulls the transport lever (59) into its rest position and thus moves the portioning roller (1) until the stop (18) with the inner one Stopper surface (82) is engaged so that the knife (12) can slide back into its starting position and a new piece of paper web (39) is transported to the outside.

Claims (7)

1. An apparatus for paying out webs, especially paper towels from a dispenser roll, comprising automatic changeover of the dispensing to a supply roll upon exhaustion of the dispenser roll, wherein a feeler in contact with the web of material of the dispenser roll under spring loading detects the presence of the web of material of the dispenser roll and, in case of absence thereof, presses the end of the web of material of the dispenser roll by way of a lever structure against the begining of the web of material of the supply roll and feeds both webs of material in common to a contact pressure roller and the counter-roller in engagement with the same, characterized by the combination of the following features:
   the feeler (31) rests on the dispenser roll (38) and unlocks a detent (28) or a protrusion (78) of a swinging plate (27) by way of levers,
   the swinging plate (27) carries a bearing (24) and can be moved about a pivot pin (22) by means of a spring (48, 79), the spring (48, 79) turns the swinging plate (27), with the supply roll (40) resting on the bearing (24), against a toothed roller (21),
   the toothed roller (21) presses the end of the web of material (39) of the dispenser roll (38) against the leading end (41) of the web of the supply roll (40).
2. The apparatus as claimed in claim 1, characterized in that the feeler (31) is pressed against the dispenser roll (38) by means of a feeler spring (33).
3. The apparatus as claimed in one of claims 1 and 2, characterized in that the feeler (31) is connected to a holding rod (29) by way of a joint pin (30).
4. The apparatus as claimed in any one of claims 1 to 3, characterized in that the holding rod (29) is supported in a holding rod guide member (49) and is in engagement with a detent (28) of the swinging plate (27).
5. The apparatus as claimed in one of claims 1 and 2, characterized in that the feeler (31) consists of a flat profile piece (71) which comprises a slide piece (69), resting on the dispenser roll, and engages in a control fork (73) of an L-shaped piece (74) by way of a peg (72).
6. The apparatus as claimed in claim 5, characterized in that the L-shaped piece (74) is pivoted about a supporting pin (75) and may be in engagement with the protrusion (78) of the swinging plate (27).
7. The apparatus as claimed in any one of claims 1 to 6, characterized in that the supply roll (40) is in engagement with a brake (20) during the paying out of web sections (50) from the dispenser roll (38).

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