NO150182B - DEVICE FOR SUCCESSIVE AA CUT AND AT THE SAME DISTRIBUTION OF ROLLED MATERIAL BANDS - Google Patents

Description

The present invention relates to a device for successively cutting and simultaneously distributing rolled material bands, which device is of a type that comprises a holder for a <p>paper roll, which holder is held pressed against a drum, which rotates in a stand attached to a wall box and on one side is equipped with a profiled hook, which, depending on the work step, cooperates with a shock absorber or with an elastic stop, and on the other side is equipped with an eccentric lever provided with a return spring to cause the drum to spring forward to provide cutting, when manually pulling the paper web, which protrudes from the device, and which device comprises a toothed cutting means, which is articulated with the drum and united with a fixed guide means, whereby at the end of the pull, which is manually directed towards the the outer end of the paper strip and which causes the drum to rotate, the cutting member comes out of a slot in the drum and besk rips a web that departs from the drum in the same direction of rotation as the drum and penetrates the paper, which is tensioned on each side of the cutting means, and cuts the paper, after which the drum is moved back to the starting position for the transfer of a subsequent web of material by the action of the jaw, the shock absorber or the elastic stop.

The invention finds particular application in connection with sanitary appliances and especially appliances for dispensing paper, cotton wool and the like.

Apparatus and devices are known which enable the distribution and cutting of paper for drying and packaging. With some of these, the paper is separated by tearing off the extracted piece against the toothed profile edge of the distributor. With other devices, the paper is cut using a cutting tool, which is mounted on the device. Devices are also known where the feeding and tearing off of the paper takes place simultaneously and automatically by tensile stress against the tape, which is pulled out of the device. This is the case above all with known devices, for which the applicant has obtained a patent.

With these known constructions, the paper is cut off by pulling on the extracted band, and then involves the operation of a drum with a rough surface, against which a pressure roll of the paper rolls, and the drum is equipped with an organ or a tool for cutting (rod, blade, wire or the like) during its rotation, which tool is brought into progressive contact over the entire length of an opposing tool, so that the cutting takes place in a scissor-like manner.

The characteristic of these previously known devices will be explained very briefly in what follows.

The apparatus is of the type which comprises a carrier for paper rolls, which is held under pressure on a drum, which rotates on a fixed stand on a box fixed to the wall and which on one side carries a profiled latch, which is arranged to cooperate with a shock absorber or an elastic stop according to the functional modes, and on the other side is provided with an eccentric lever with a return spring for displacing the drum to provide material cutting by manually pulling the protruding band to carry out the cutting and to increase its efficiency .

With the help of the invention, the aim has been to simplify the apparatus, make it less sensitive, reduce the tensile stress in the protruding band for the cut-off and improve the efficiency of the apparatus.

To achieve this, the invention relates to a device for cutting which makes it possible to loop the compensation tool or the fixed cutting device and ensure a cut which is no longer progressive in a saw-like manner, but which provides the tear-off in accordance with a single cut .

The device according to the invention is characterized by the fact that the holder for the cutting blade consists of a rod for mounting the blade and two arms located at the ends of this rod and perpendicular to this rod, at least one of these rods being extended with a perpendicular and in-plane branch ,

at the free end of which there is a joint point located in one flange of the drum, with a steering device or steering devices mounted in the intersection between the two parts of the arm or arms that roll in the one or two eccentric tracks and/or to the one flange jointed finger.

Further characteristic features of the device will appear

of the subsequent patent claims.

The invention will be explained in more detail below with reference to the drawings, where

fig. 1 shows a perspective view of an apparatus with separate parts according to a previously known embodiment without thereby limiting the invention.

Fig. 2 and 3 are an end view and a side view showing the drive member for the cutting device according to a first embodiment, and

fig. 4 is a cross-section showing the known mechanisms, which participate in the function of the apparatus and which are shown when the material is extracted.

Fig. 5 and 6 show the effect of the mechanisms according to fig. 4 at two different phases, namely during braking of the drum and its impact. Fig. 7 shows in perspective and partially in section a first embodiment of the cutting device in the retracted position in the drum. Fig. 8, 9 and 10 are schematic drawings showing the cutting device according to fig. 7 in three different phases. Fig. 11 shows a cross-section of the apparatus according to a modified embodiment in rest position, and

fig. 12 is a cross-section of the drive drum with the control device for the cutting blade during the pulling of the material.

Fig. 13 shows a cross-section along the line 13-13 in fig. 12, and

fig. 14 shows a cross-section similar to that in fig. 13 but shows the end of the cut.

Fig. 15 is a perspective view showing the cutting blade bearing and its control device, and

fig. 16 shows a cross-section along the line 16-16 in fig. 12, which shows the groove in the comb.

Fig. 17 shows a cross-section along the line 17-17 in fig. 14, which illustrates the storage of the cutting blade on the drum, and

fig. 18, 19 and 20 schematically show an embodiment of the apparatus with two feeding and cutting devices.

The invention shall be made more concrete in the following description of the exemplary embodiment shown in the drawings, to which the invention is in no way limited.

The apparatus shown in the drawings is of the type explained above. In the following, the assembly of the various elements will be briefly explained to facilitate understanding of the device's operation.

In fig. 1 shows the main parts that make up the device, i.e. the holder A placed on the wall, the roller stand B and the mechanism's bearing C.

The holder placed on the wall is made up of a curved plate, which forms a vertical bottom 1 and a base part 2. At the sides of the bottom and the base part, there are bent or fixed side walls 3 with a largely triangular shape, on which a cover 4 of sheet material or plastic.

The bottom plate 1 is provided with vertical and horizontal recesses 1a for fastening and near its lower part with a slot with a pressed-in flange 1b. The base part 2 is double folded at 2a along its free edge. These two structural parts, namely the lip 1b and the edge 2a, are designed to accommodate the mechanism bearing by snapping in, which for this purpose is provided with a base part 5, which consists of a bottom 5a and two side walls 5b. In the upper part, the base 5a is provided with a lip 5c on the outside for engagement under the lip flange lb of the holder, while the side walls 5b at the lower parts form recessed parts, whereby projecting parts 5d can be brought into engagement under the double-folded edge 2a of the holder.

The roll holder is likewise mounted by simply snapping onto the wall holder with the help of a ledge-equipped shaft 6, which extends through the roll holder and protrudes laterally and engages by means of elasticity in openings, which are formed in lip flanges 3a in the side walls of the wall holder 3 and which is buoyed parallel to said side walls.

The roll holder is made of a profiled iron 7 with one end, in which a fastening arm 8 is fixed, while the other end articulately carries a movable arm 9.

The connecting shaft 6 is hingedly connected to the side walls of the holder and extends through the fixed arm and a U-shaped plate 10 is fixedly connected to the plate 7, with which the movable arm 9 is hingedly connected. In order for the material roll R to be kept in constant contact with the drum , springs 11 are arranged on the shaft, one end of which bumps against the holder during compression.

The roller R is carried for rotation on the side where the fixed arm is placed, by a grooved disc 12, which is arranged to cooperate with a projecting pin, which engages with the hub of the roller.

The movable arm 9 is articulated by means of a pin 15 and is elastically pressed against the roll by a coil spring 16, which is arranged in an appropriate manner. The arm 9 also has a slant

end 9a to facilitate its grip.

According to a first embodiment, which is shown in figures 2, 3, 7,

8, 9 and 10, the material's drive drum 17 is mounted with its shaft 18 on two bearings 19, 20, which engage with recesses 5e in the side walls 5b. Through the bearing 19 extends a lever 26 which is fixedly connected to the shaft 18 and to the end of which is attached a spring 21, which is connected to the base 5a and arranged to influence the drum when it is tensioned by the action of the lever.

On the inside of the side wall 5b, the bearing 19 has a cam 19a, which cooperates with the carrier under the action of a profiled arm, a guide roller or a roller bearing 22, which is not rotatably connected to the rotation shaft 23 of the cutting tool's bearing 24, which extends through the drum's wall (fig. 7).

Advantageously, the tool bearing is made of a single stopped piece, and the tool itself is made either of a toothed metal blade 25 which is immersed in the tool bearing (as shown) or of a toothed blade of stopped material.

On the same side as the bearing 20, a stop 28 and a shock absorber 29 are placed on the drum's shaft 18. These various bodies, as well as a stop 30, which is hingedly connected to the side wall 5b, participate in the cutting according to the phases described below.

When the protruding part of the paper strip is pulled, the drum 17 with the rough surface 17a is caused to rotate. The spring 21 is stretched and when the lever 26 has passed over its dead center position, the drum is thrown violently. At the same time, the arm, guide roller or roller bearing 22, which is firmly connected to the shaft 23 of the tool bearing 24, is displaced around the cam 19a (Fig. 8). When the dead center position is achieved, the guide roller 22 rests against the end of the cam itself (fig. 9). When the drum has been wound, the guide roller 22 follows the contour of the cam and forces the tool bearing to swing, which causes the blade 25 to feed out of the groove 17b in the drum and thereby describes a circular arc in the direction away from the drum (by the drum's rotational effect). The paper stretched by the user in combination with the roller bearing's pressure against the drum means, as will be easily realized, that the teeth of the blade 25 penetrate the paper and provide a quick and clean cut.

During this action, the part 28a, which forms the cam on the latch 28, will pass in front of the stop 30 during its displacement away against the action of the return spring (Fig. 4).

After the cut, the drum further describes a certain circular arc along its path, until the end 28b of the stopper has come into contact with an angled part 29a of the shock absorber, which is thus included in the rotation (fig. 5). Since the shock absorber is held elastically by the spring 31, the drum is braked and stopped. The shock absorber, which returns from the rear to gently rest against a stop 32, has been designed in a side wall, whereby a shock effect is obtained. The block then engages at point 28d under an angular buoyed part 30a of the stop 30 and in this way prevents a backward movement of the drum (fig. 6).

As the latch is mounted on the drum's shaft by means of an elongated opening 28c and is adjusted by means of a shaft 33, it will be understood that the latch by means of only its weight depending on the rotational position tilts in this opening to either hit the shock absorber under the free removal movement or to be displaced towards the shock absorber, when a new tensile stress is applied to the paper.

Meanwhile, the guide roller 22, which has ceased to follow the contour of the cam 19a end, accelerates the tool carrier 24 to a remote position in the drum under the action of a return spring 13, which is attached to the tool carrier and a flange on the drum.

It should be pointed out that in order to achieve the correct tension in the paper on both sides of the cutting blade (which tension is obtained upstream by the paper roll's pressure against the drum) there is a device on the inside of the cover 4 to press against the drum. This body must be soft so as not to have a harmful effect on the carriage and must allow the cutting blade to pass. To achieve this, a member 34 is provided in the form of a brush, the bristles of which allow the teeth of the blade to pass without being adversely affected.

Furthermore, a smooth band 17c is arranged on the drum upstream of the groove 17b, which protrudes somewhat in relation to the rough surface. With this band, the paper is avoided from being carried away from the roll by adhesion in this area and it is placed in the correct position above the opening in the cover, when it is pulled out by the forward action of the drum.

According to an embodiment, which is shown in fig. 11-17, the drum 46 has a rough surface, a flange 46a, which forms a rotation shaft 46b in a side wall 5b of the stand, on which the latch 28 and the shock absorber 29 are mounted.

At the opposite end, the drum's flange 46c rotates on the second wall 5b of the stand by means of a cylindrical bearing 47a, which is formed on the eccentric lever 47 for winding the drum, which is connected to the stand by means of the spring 48. The eccentric lever 47 has at the end a drive pin 47b (e.g. a square pin) for the flange of the drum, which interacts with this with force.

The bearing 49 for the cutting blade, which is shown in fig. 15, comprises a rod 49a, in which the cutting blade 50 provided with teeth is inserted into it. At one end of the rod 49a, an arm 49b with an outer finger 49c is formed perpendicularly, which is arranged to slide in a groove 46d in the flange 46a.

At the opposite end, a perpendicular arm extends the rod'49a. This arm first forms a part 49d, which is similar to the arm 49b, and then a part 49e, which continues largely perpendicular to the part 49d and whose free end is hingedly connected to the flange at point 49f.

At the intersection between the two parts and following a line, which is parallel to the blade and which extends through the axis 49c of the finger, a guide roller, a roller bearing etc. is mounted for free rotation. member 51, which forms a guide and which extends in the outward direction and whose axle bearing 51a passes through a groove 46e in the flange 46c with the same dimension and setting as the groove 46d.

The control 51 lies for rotational movement in a groove 5e, which is formed on the inside of the stand's side wall 5b. This track, which is shown in more detail in fig. 16, is in the form of a cam, consisting of a part concentric with the axis of rotation of the drum or pin 47a (part a-b, fig. 16), of a slightly curved part extending away from the shaft (part b-c, fig . 16), of a semi-circular top part (part c-d, Fig. 16), and a circular arc-shaped part, which joins the concentric part (part d-a, Fig. 16).

The track's 5th profile has been designed to fulfill the following functional conditions, namely

- the protrusion of the cutting blade outside the drum (between the removal and re-insertion) must take place along a stretch equal to one fifth of the drum's circumference (the stretch x in fig. 13), - the beginning of the cutting blade's protrusion must lie immediately after the contact point of the material roll (fig. 13). This is achieved by rapid return of the comb at the top part on the return to the concentric part.

To these conditions must be added those relating to the other organs: - the outlet point for the cutting blade must lie approximately one quarter of the extraction of the material. This is achieved by setting the detent and shock absorber or stop in relation to the blade's bearing,

- the surface of the drum does not allow the material to slip

(rough surface or easily adherent surface),

- the relationship between the dimension of the extended blade and the distance covered by it must be determined with the utmost precision as a function of the material's adhesion to the drum. This ratio can change with the quality of the feed

material,

- the center of rotation 49f of the cutting blade must lie on the flange of the drum in such a way that an exact relationship is obtained between the axial distance and the straightened circular arc, which is formed by the blade between its exit point and its penetration into the material (shaft 52, fig. 17), - the width of the groove 46f on the drum must be sufficient for the passage of the blade in its extent, but it must not adversely affect the rolling movement of the material roll on the rough surface.

If the devices necessary for the operation of the device (the shock absorber, the lock, etc.) have been arranged in a different way than those shown, to which the invention is not limited, it is of course possible to let the blade be maneuvered by means of guides and tracks in the form of a comb on both sides of the drum.

In certain cases of use of the device, two feeding devices and two cutting devices according to the invention can be mounted on the same support and under the same cover.

This is above all the case in such places, where a large number of people use sanitary facilities, e.g. at stations, airports, exhibitions, warehouses etc. In such places there are special service staff whose task is to look over and fill paper holders etc. This service staff, however, passes by at a regular time every day or according to a certain schedule. It would be unpleasant for a visitor at a certain time of day to come across several empty appliances.

In order to avoid this disadvantage, it has thus been thought of to install two cutting and feeding devices for paper in one and the same housing with the intention of simultaneously or alternately using the two devices.

Many solutions are possible to provide this. In fig. 18

and 19 shows a first embodiment, according to which two devices have been placed one behind the other. The first device D can be hingedly placed at point 35 on the stand in order to be brought into operation in a simple way after the second roller bearing E (fig. 19).

In this embodiment, one or the other of devices D and F is used alternately in the following way: - when the two rolls are full (fig. 18), device D must be used. Thus, the device F must be blocked so that it cannot be used.

For this purpose, a lever 36 is arranged, which at point 37 is hingedly attached with its middle part to a side wall of the device D. This lever is constantly pressed to the one in fig. 18 shows the position of the spring 38 so that its rear end 36a will lie directly opposite a projecting part 39a on the drum 39 in the second arrangement and in this way its rotation is of course prevented on the condition that the paper does not protrude under the cover.

When the first roll is almost finished, its support arm 40 rests against the front part of the lever 36 and presses this, until the first roll is completely finished. At this moment the lever (see Fig. 19) tilts, the drum 39 is released and the feed spring 41, which is under tension, swings the roll to feed forward a piece of paper. This second roll of paper can then be used.

Service personnel then insert a new roll into the first device and, if necessary, also into the second. The support arm 40 is swung upwards and the lever 36 is swung automatically to again block the drum 39 which the service person guides back towards the stop, i.e. puts it under tension.

According to the embodiment shown in fig. 20, it is possible to use the two devices simultaneously or alternately with each other.

To achieve this, the lever 4 2 is no longer pressed by the spring to the upper position/in the upward direction, but it is only provided with a brake 43, e.g. on the joint shaft, to maintain the selected position. In this case, the first device on its drum 44 has a projecting part 44a in the same position as the projecting part 39a for the preceding drum 39 and the lever has a recess 42a in front. When the first roll is finished, a support arm 40 is pressed against the lever and the recess 42a holds the stop 44a. The second device is released in the same way as before.

When a new roll is inserted into the first device, the lever can either be left in a position so that the second roll is used up, or the lever can be raised at the gripping end 42b, so that the first roll can be used again under blocking of the other device.

The lever can also be placed in an intermediate position to release the two mechanisms so that both rollers can be used.

It should be pointed out that the two levers 36 and 4 2 have a travel length, which is limited by the two stops 45 on the first device in order to be influenced, only when the roll is almost used up. In addition, another setting device 34 for the paper on the drum is arranged behind the first device directly opposite the second drum.

It is therefore obvious that the cutting blade, which is mounted in this way and which is maneuvered by simply pulling the material, which entails a rotation of the drum, enables a clean and fast cut regardless of the quality of the material to be discharged, thanks to the profile of the comb .

Claims (6)

1. Device for successively cutting and simultaneously distributing coiled material bands, which device is of a type comprising a holder (B) for a paper roll, which holder is held pressed against a drum (17), which rotates in a stand (C) which is attached to a wall box (A) and on one side is equipped with a profiled hook (28), which, depending on the work step, cooperates with a shock absorber (29) or with an elastic stop (30), and on the other side is equipped with an eccentric lever (26) provided with a return spring (21) to cause the drum (17, 46) to spring forward to provide cutting, when manually pulling the paper web, which protrudes from the device, and which device comprises a toothed cutting member (24, 25, 49, 50), which is articulated with the drum (17, 46) and united with a fixed guide member (19a), whereby at the end of the draw, which is manually directed towards the projecting paper strip and which brings the drum (17) to rotate, spoon the reorgan (24, 25) emerges from a groove (17b, 46f) in the drum (17, 46) and describes a path that moves away from the drum in the same direction of rotation as the drum and penetrates the paper, which is tensioned on each side of the cutting device, and cuts the paper, after which the drum (17, 46) is moved back to the starting position for the transfer of a subsequent material band by the impact of the hook (28), the shock absorber (29) or the elastic stop (30), characterized in that the holder (49 ) for the cutting blade (50) consists of a rod (49a) for mounting the blade and two arms (49b, 49d) situated at the ends of this rod and perpendicular to this rod, at least one of these rods being extended with a perpendicular and branch (49e) located in the same plane, at the free end of which there is a joint point (49f) located in one flange (46c) of the drum (46), as a control device or steering device hinges (51) which roll in d one • or the two eccentric grooves (5e), and/or to the one flange articulated finger (49c). 2. Device as stated in claim 1, characterized in that the eccentric groove (5e) in one or both sides (5b) of the support frame is formed by a part (a-b), which is concentric with the drum's axis of rotation (46b, 47a), a slightly bent part (b-c), which departs from the shaft, a semi-circular top part (c-d) and a part (d-a) returning quickly to the concentric part in the form of a circular arc, the one or two eccentric grooves (5e) being appropriate directed with respect to other means (hook (28), stop (30), etc.) to cause the blade to emerge from the drum at an appropriate moment during the pull directed on the material. 3. Device as stated in claim 2, characterized in that the one or two eccentric grooves (5e) have a profile arranged as a complement to the part (a-b) concentric with the drum's rotation axis, so that the cutting blade moves approx. a fifth of the drum's periphery between its starting point and its return point (distance x), that the blade (50) comes out immediately after the point where the material roll is pressed against the drum (46), and that the cutting blade (50) retracts after cutting. 4. Device as specified in claim 2, characterized in that the one or the two eccentric grooves (5e) are so directed in the side or sides (5b) of the drum's support stand, that extraction of the blade (50) from the drum (46) begins when an eccentric lever (47), which drives the drum forward, is in the dead position or at the point of maximum tension of the spring (48), this starting point for the blade (50) being located approximately at a distance of a quarter of the draw adapted to the material. 5. Device as stated in claim 1, characterized in that one or more of the blade's rotation centers (49f, 52) in the drum's (46) flanges (46a, 46c) are located in such a way that a precise relationship is achieved between the blade's axial removal and the envelope curve of the circular arc that the blade (50) describes between its starting point and the point of its penetration into the material (52, fig. 17), in that the ratio between the extension of the blade and the angular distance that the blade describes can be varied depending on the material being distributed. 6. Device as stated in claim 1, characterized in that the one or two bearing and steering shafts (51a) and the joint finger (49c) which slides in the grooves (46d, 46e) which direct the flanges (46a, 46c) penetrate it to the drum (46) the articulated knife holder (49) which cooperates through the one or two control means (51) with the one or two eccentric grooves (5e).