DK152005B - DEVICE FOR CUTTING AND PERFORMING A LENGTH OF A ROLLED MATERIAL BAND - Google Patents

Description

The present invention relates to an apparatus for cutting and feeding a length from a roll of material wound in a roll, which apparatus is of a kind including a holder for a roll of material which is pressed against a drum which can rotate in a rack which is attached to a wall box and on one side is equipped with a profiled chin which, depending on the working step, can cooperate with a shock absorber or with an elastic stop, and on the other hand is equipped with an eccentric lever with a return spring for causing the drum to jump to provide cutting when manually pulling the material strip projecting out of the apparatus, and the apparatus comprising a toothed cutting member articulated with the drum and joined to a fixed guide means, thereby terminating the pull-out manually applied to the projecting material belt, which pull causes the drum to rotate and the cutting means to come out of a slit in the the drum and describing a web which departs from the drum in the same direction of rotation as the drum and penetrates the material which is tensioned on either side of the cutting means and cutting the material, after which the drum is moved back to the initial position to transmit a subsequent length of material strip by the action of the chin, shock absorber or elastic impact.

The invention is particularly applicable in connection with sanitary and special apparatus for conveying paper, cotton wool and similar materials.

Apparatus are known which allow the distribution and cutting of paper for drying and packaging. In some of these, the paper is split by tearing the extracted piece against a toothed profile edge of the apparatus. In other appliances, the paper is divided by means of a cutting tool mounted on the apparatus. Apparatus are also known in which the feeding and tearing of the paper is done simultaneously and automatically by pulling the strip pulled out of the apparatus. This is especially the case for appliances that have been patented by the applicant. In these known constructions, the paper is cut by pulling in the drawn band, and then results in the operation of a rough surface drum against which a roll of pressure rolls off the paper and the drum is provided with a means or tool for cutting (rod, blade or wire) during its rotation, leading the tool to progressive contact over the entire length of an opposing tool in such a way that cutting occurs as a cutting.

The characteristics of these prior art devices will be explained quite briefly below.

The apparatus is of the type comprising a paper roll carrier which is pressurized on a drum which rotates on a fixed frame on a wall-mounted box, and which, on the one hand, carries a profiled latch disposed to cooperate with a shock absorber or elastic stop after the function steps and, on the other hand, is provided with an eccentric rod with a return spring for displacing the drum to provide material cutting by manual pull in the protruding belt to perform the cutting and to increase the its effectiveness.

By means of the invention, the aim has been to simplify the apparatus, make it less sensitive, reduce the tensile effect of the protruding band and improve the efficiency of the apparatus.

In order to achieve this, the invention relates to a cutting apparatus which makes it possible to avoid the restraining tool or the fixed cutting means and to ensure a cutting which is no longer a progressive cutting, but which provides tearing at a single cutting.

The apparatus according to the invention is characterized in that the holder of the cutting blade is constituted by 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 the same plane. a branch, at the free end of which is a guide point located in one flange of the drum, with in the intersection of the two parts of the arm or arms a control mechanism or control mechanisms which can roll in one or both of the two in the support frame, respectively, one or both sides formed eccentric grooves, and / or one finger of one flange.

Further peculiar features of the apparatus will be apparent from the following claims.

With the apparatus according to the invention one obtains a robust apparatus which with low force exertion for extracting the material strip ensures cutting of equal length pieces of the material web.

The embodiment of claim 2 is advantageous in that the eccentric groove ensures the desired control of the knife blade in a simple and effective manner, while a configuration according to claim 3 ensures that the blade is ejected from the drum immediately after the material web construction time and is withdrawn. when the material web is cut.

Claim 4 discloses an embodiment which provides additional assurance of reliable interaction between the means which, by pulling in the material web, causes the web cut, and the embodiment according to claim 5 allows adjustment of the means which effect the material web cutting so that the functions of these members are adapted to the properties of the material band to be cut, and finally, with the peculiarities of claim 6, additional security is obtained in the cut-off function.

The invention will now be explained in more detail with reference to the drawings, in which fig. 1 is a perspective view of an apparatus with separate parts according to a prior art embodiment; 2 and 3 are an end view and a side view showing the cutting device driver according to a first embodiment.

FIG. Fig. 4 is a cross-sectional view showing the known mechanisms which participate in the operation of the apparatus and which are shown by the extraction of the material; 5 and 6 show the effect of the mechanisms of FIG. 4 at two different stages, namely by braking the drum and stopping it; FIG. 7 is a perspective and partial sectional view of a first embodiment of the cutting apparatus in the retracted position in the drum; FIG. 8, 9 and 10 in schematic form the cutting apparatus according to FIG. 7 in three different steps; 11 is a cross-sectional view of the apparatus according to an altered embodiment in a resting position; FIG. 12 is a cross-sectional view of the drive drum with the cutting blade guide mechanism during the extraction of the material; FIG. 13 is a cross-sectional view taken along line 13-13 of FIG. 12, and FIG. 14 is a cross-section similar to that of FIG. 13 but showing the end of the cut, FIG. 15 is a perspective view of the cutting blade bearing and its control mechanism; FIG. 16 is a cross-sectional view taken along line 16-16 of FIG. 12, showing the groove in the cam; FIG. 17 is a cross-sectional view taken along line 17-17 of FIG.

14, showing the cutting blade's bearing in the drum; and FIG. 18, 19 and 20 schematically illustrate an embodiment of the apparatus with two feeding and cutting apparatus.

The apparatus shown in the drawing is of the above type. In the following, the assembly of the various elements must be explained briefly in order to facilitate the understanding of the operation of the apparatus.

In FIG. 1 shows the main parts which make up the apparatus, i.e. the holder A on the wall, the roller rack B and the bearing C.

The holder mounted on the wall is constituted by a bent plate which forms a vertical bottom 1 and a base part 2. Next to the bottom and the base part there are bent or fixed side walls 3 of a largely triangular shape on which a cover is pivotally mounted. 4 of sheet material or plastic.

The base plate 1 is provided with vertical and horizontal cut-offs 1a for attachment and in the vicinity of its lower part with a slot with an indented flange 1b. The base portion 2 is bent at 2a along its free edge. These two structural members, namely the lip 1b and the edge 2a, are intended to receive, by snap-locking action, the mechanism bed, which for this purpose is provided with a base part 5 consisting of a bottom 5a and two side walls 5b. The bottom 5a is provided in the upper part with a lip 5c on the outside for engagement under the lip flange 1b of the holder, while the side walls 5b at the lower parts form recessed parts, whereby protruding parts 5d can be engaged under the bent edge 2a of the holder.

The roller bracket is also mounted by simple snap-locking action on the wall bracket with the aid of a shaft 6 provided with a ledge extending through the roller bracket and projecting laterally and engaging by elasticity in openings formed in lip flanges 3a in the wall bracket's side walls 3 , and which is bent parallel to said sidewalls.

The roller holder is formed of a profile iron 7 with one end into which is attached a fastening arm 8, while the other end pivotally carries a movable arm 9.

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

The roller R is supported for rotation on the side where the fixed arm is positioned, by a grooved disc 12 arranged to cooperate with a protruding pin engaging the roller hub.

The movable arm 9 is pivotally mounted by a split 15 and is elastically pressed against the roll by a screw spring 16 which is appropriately arranged. The arm 9 also has an inclined end 9a to facilitate its gripping.

According to a first embodiment shown in FIG. 2, 3, 7, 8, 9 and 10, the drive drum 17 of the material is mounted with its shaft 18 on two bearings 19, 20, which engage cut-outs 5e in the side walls 5b. Through the bearings 19 extends an arm 26 which is firmly connected to the shaft 18 and to whose end a spring 21 is attached which is connected to the bottom 5a and arranged to actuate the drum as it is tensioned by actuation of the arm. On the inside of the side wall 5b, the bearing 19 has a cam 19a which cooperates with the support mechanism with the aid of a profiled arm, a guide roller or a roller bearing 22 which is non-pivotally connected to the rotary shaft 23 of the cutting tool bed 24 extending through the wall of the drum (Fig. 7).

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

On the same side as the bearing 20, on the shaft 18 of the drum, a latch 28 and a shock absorber 29. are provided. These various means, like a stop 30, which are connected to the side wall 5b, participate in the cutting according to the steps described below.

When pulling the protruding portion of the paper tape, the drum 17 with the rough surface 17a is caused to rotate. The spring 21 is stretched and when the arm 26 has passed through its dead-end position, the drum is sharply flung. 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 point position is achieved, the guide roller 22 abuts the end of the cam itself (Fig. 9). Once the drum has been flung, the guide roller 22 follows the contour of the cam and forces the tool bearing to pivot, causing the blade 25 to exit from a slot 17b in the drum, thereby describing a circular arc in the direction away from the drum (by the drum's rotary action). The paper extended by the user in combination with the roller bearing pressure against the drum, as it will be readily apparent, the teeth of the blade 25 penetrate the paper and provide a fast and clean cut.

Under this effect, the part 28a forming the cam on the latch 28 will pass in front of the stop 30 during its displacement away from the action of the return spring (Fig. 4).

After the cutting, the drum along its path further describes a certain circular arc until the end 28b of the latch comes into contact with an angled bend portion 29a of the shock absorber, thus entailed in the rotation (Fig. 5). Since the shock absorber is elastically held by the spring 31, the drum is braked and stopped. The shock absorber, which returns from the rear to softly engage the impact 32, has been configured in a side wall to provide a shock effect. The latch then attaches to the point 28d below an angled portion 30a of the stop 30, thus preventing a decline in the backward direction of the drum (Fig. 6).

Since the latch is mounted on the drum shaft by means of an elongate aperture 28c and adjusted by a shaft 33, it will be understood that the latch only flips in this aperture according to its pivot position to either strike the shock absorber below it. free withdrawal movement or to be displaced against the shock absorber when a new tensile effect is exerted on the paper.

Meanwhile, the guide roller 22, which has ceased to follow the contour at the end of the cam 19a, has led the tool carrier 24 to a different position in the drum with the aid of a return spring 13 attached to the tool carrier and a flange on the drum.

It should be emphasized that in order to obtain correct tension in the paper on both sides of the cutting blade (which is obtained above by the pressure of the roll of paper against the drum), a means for pressing against the drum is provided. This body should be soft so as not to adversely affect the bearing and should allow the cutting blade to pass. To achieve this, there is provided a means 34 in the form of a brush or brush, the hair of which permits the teeth of the blade to pass without being adversely affected.

Furthermore, on the drum above the slot 17b, seen in the feed direction, a smooth band 17c is arranged which protrudes somewhat in relation to the rough surface. By this tape, the paper is prevented from the roll by adhesion in this area, and it is placed in the correct position above the opening in the cover as it is pulled out by the projecting action of the drum.

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

At the opposite end, the flange 46c of the drum rotates on the second wall 5b of the stand by means of a cylindrical bearing 47a formed on the eccentric arm 47 for swinging the drum connected to the stand by the spring 48. The eccentric arm 47 has at the end a drive pin 47b (for example, a square pin) for the flange of the drum which cooperates with it to transmit the required forces.

Bearing 49 for the cutting blade shown in FIG. 15, includes a rod 49a in which is mounted a toothed cutting blade 50. At one end of the rod 49a, an arm 49b with an outer finger 49c arranged to slide in a groove 46d is formed perpendicularly. flange 46a.

At the opposite end, a perpendicular arm extends rod 49a. This arm first forms a portion 49d which is similar to an arm 49b and then a portion 49e which extends substantially perpendicular to the portion 49d and whose free end is articulated with the flange at point 49f.

At the intersection of the two parts and according to a line parallel to the blade, which line extends through the axis of the finger 49c, a guide roller, roller bearing or similar means 51 forming a guide is mounted for free rotation and which extending outwardly, the shaft bearing 51a passing through a groove 46e in the flange 46c having the same dimension and alignment as the groove 46d.

The guide 51 is mounted for rotational movement in a groove 5e formed on the inside of the side wall 5b of the stand. This track, which is shown in more detail in FIG. 16 is in the form of a cam consisting of a portion concentric with the rotary shaft of the drum or pin 47a (portion ab, FIG. 16) of a slightly curved portion extending away from the shaft (portion bc, FIG. 16), of a semicircular top portion (portion σ-d, Fig. 16), and a circular portion joining the concentric portion (portion then, Fig. 16).

The 5th profile of the groove has been designed in order to fulfill the following functional conditions, namely the feeding of the cutting blade outside the drum (between the embodiment and the insertion) must take place over a distance equal to one fifth of the circumference of the drum (distance x in Fig. 13). , the beginning of the cutting blade design must be immediately after the point of contact with the material roll (Fig. 13), - the beginning of the cutting blade design must occur when the eccentric arm is in the dead-end position, the cutting blade must be quickly removed after cutting to avoid any risk of damage by the user of the apparatus. This is achieved by rapid return of the comb at the top portion upon return to the concentric portion.

To these conditions must be added the conditions relating to the other organs: - the point of discharge of the cutting blade must be about one quarter of the length of the extracted material. This is achieved by adjusting the lock and shock absorber after impact to the blade bearing.

the surface of the drum does not allow slipping of the material (rough surface or slightly adhering surface), the relationship between the dimensions of the blade performed and the stretch of this distance must be determined with utmost accuracy as a function of the adhesion of the material to the drum. This ratio can be changed with the quality of the material conveyed - the center of rotation 49f of the cutting blade must lie on the flange of the drum in such a way as to obtain an accurate relationship between the axial distance and the straightened arc formed by the blade between its outlet point and the penetration into the material (shaft 52, Fig. 17); - The width of the slot 46f on the drum must be sufficient for passage of the blade to its extent, but it must not adversely affect the rolling movement of the material roll on the rough surface.

Of course, if the means necessary for the operation of the apparatus (shock absorber, latch, etc.) have been placed differently than those shown, it is of course possible to allow the blade to be operated by means of a guide and groove in the form of a comb on both ends of the drum.

For certain applications of the apparatus, two feeding mechanisms and two cutting mechanisms according to the invention can be mounted on the same support and under the same cover.

This is especially the case in such places where a large number of people use sanitary facilities, for example at stations, airports, exhibitions, warehouses, etc. In such places, there are special service personnel who are responsible for supervising and filling paper holders and similar appliances. This service staff regularly passes every day or passes according to a certain schedule. It would be uncomfortable for a visitor at some point in the day to encounter several empty appliances.

Thus, in order to avoid this disadvantage, it is envisaged to mount two paper cutting and feeding apparatus in one and the same housing with the intention of using the two appliances simultaneously or alternately.

Many solutions are possible to provide this. In FIG. 18 and 19, there is shown a first embodiment according to which two devices have been arranged, one behind the other. The first apparatus D may be pivotally positioned at point 35 on the rack to be readily operable after the second roller bearing E (Fig. 19).

In this embodiment, one or the other apparatus D and F is used alternately as follows: - when the two rollers are full (Fig. 18), the apparatus D must be used. Thus, the apparatus F must be blocked in such a way that it cannot be used.

For this purpose, an arm 36 is provided which at the point 37 is pivotally secured with its center portion to a side wall of the apparatus D. This arm is constantly pressed to the one shown in FIG. 18, for its rear end 36a to lie directly opposite a protruding portion 39a of the drum 39 of the second apparatus and, in this way, of course, preventing its rotation, provided that the paper does not protrude below the cover .

When the first roll is nearly exhausted, its support arm 40 abuts on the front of the arm 36 and presses it until the first roll is fully used. At this moment, the arm (see Fig. 19) flips, the drum 39 is released, and the projecting spring 41, which is under tension, swings the roller to feed a piece of paper. The second roll of paper can then be used.

The service staff then inserts a new roll in the first appliance and, if necessary, also in the second. The support arm 40 is pivoted upward and the arm 36 is automatically pivoted to re-block the drum 39, which the service person returns to 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.

To achieve this, the arm 42 is no longer pressed by the spring to the upper position / upwardly, but it is only provided with a brake 43, for example on the articulated shaft, to maintain the selected position. In this case, the first apparatus on its drum 44 has a protruding portion .44 in the same position as the protruding portion 39a of the preceding drum 39, and the arm has a cutout 42a in front. When the first roll is used up, a support arm 40 is pressed against the arm and the cutout 42a retains the stop 44a. The second device is released in the same way as before.

When inserting a new roller into the first apparatus, one may either leave the arm in a position such that the second roller is consumed, or the arm may be lifted at the gripping end 42b, so that the first roller can be re-used during blocking the other device.

The arm can also be placed in an intermediate position to release the two mechanisms in such a way that both rollers can be used.

It should be emphasized that the two arms 36 and 42 have a strike length which is limited by the two stops 45 on the first apparatus only to be affected when the roller is nearly exhausted. In addition, a second setting means 34 for the paper on the drum is located behind the first apparatus directly opposite the second drum.

Thus, it is obvious that the cutting blade mounted in this way, which is operated by a single pull in the material, which causes a rotation of the drum, enables a clean and fast cut regardless of the quality of the material to be fed, thanks be the profile on the cam, the projection of the drum by the eccentric arm, the rough surface of the drum, the material roller press under pressure against the drum, which serves as a restraint for the cutting blade, as well as the impact of the toothed blade.

Claims (6)

Apparatus for cutting and feeding a length from a roll of material wound in a roll (R), which apparatus is of a kind including a holder (B) for a roll of material which is pressed against a drum (17), which can rotate in a rack (C) which is attached to a wall box (A), and on one side is equipped with a profiled chin (28) which, depending on the working step, can cooperate with a shock absorber (29) or with an elastic stop (30) and, on the other hand, is provided with an eccentric lever (26) provided with a return spring (21) to cause the drum (17, 46) to spring to provide cutting when manually pulling in the material belt projecting out of the apparatus, and the apparatus comprising a toothed cutting means (24, 25, 49, 50) connected to the drum (17, 46) and joined to a fixed guide means (19a) whereby at the end of the extraction manually exerted against the protruding material belt, which extension brings the drum (17) for rotating and the cutting means (24,25) to emerge from a slot (17b, 46f) in the drum (17, 46) and to describe a web which deflects from the drum in the same direction of rotation as the drum and penetrates the material, which is tensioned on either side of the cutting means and cutting the material, after which the drum (17, 46) is moved back to the initial position to transmit a subsequent length of material tape. By action of the chin (28), the shock absorber (29) or the elastic stop ( 30), characterized in that the holder (49) for the cutting blade (50) is constituted by a rod (49a) for mounting the blade and two arms (49b, 49d) located at the ends of this rod and perpendicular to this rod, at least one of these rods is extended by a branch (49e) perpendicular to and at the same plane, at the free end of which is a guide point (49f) located in one flange (46c) of the drum (46), the two parts of the arm or arms are fitted with a steering mechanism or steering mechanism eccentric grooves (5e) formed in one or both of two of the eccentric grooves (5e) formed in one or both sides (5b) of the carrier frame (5e), and / or of a finger (49c) belonging to one flange. Apparatus according to claim 1, characterized in that the eccentric groove (s) (5e) is formed by a part (ab) concentric with the rotary shaft of the drum (46b, 47a), a curved part (b-σ) which removes say from the shaft, a semicircular top portion (cd) and a abrupt return to the concentric portion (ab) recurring portion (da) in the form of a circular arc, the one or two eccentric grooves (5e) being suitably directed with respect to other means (chin (28), stop (30), etc.) to cause the blade to come out of the drum at an appropriate moment during the pull exerted on the material. Apparatus according to claim 2, characterized in that one or the two eccentric grooves (5e) have a profile arranged in such a way that the cutting blade moves about the concentric part (a-b) concentric with the rotational shaft of the drum. a fifth of the circumference of the drum between its starting point and its return point (distance x), that the blade (50) comes out immediately after the point where the roll of material is pressed against the drum (46) and that the cutting blade (50) retreats after the cutting. Apparatus according to claim 2, characterized in that one or both of the eccentric grooves (5e) are so directed in the side or sides (5b) of the drum carrier rack that withdrawal of the blade (50) from the drum (46) begins, when an eccentric lever (47) capable of driving the drum is in a resting position or at the maximum tension of a spring, this starting point of the blade (50) being approximately at a distance of one quarter of the material being pulled. Apparatus according to claim 1, characterized in that one or more of the rotation centers of the blade (49f, 52) are located in the flanges (46a, 46c) of the drum (46) so as to obtain an exact relationship between the axial movement of the blade and the envelope of the blade. a circular arc described by the blade (50) between its starting point and the point of its penetration into the material (52, Fig. 17), the ratio of the blade's exit distance to the angular distance described by the blade being adjustable depending on the material being fed. Apparatus according to claim 1, characterized in that the blade bearing (49), which is connected to the side flanges (46a, 46e) of the drum (46) and which cooperates with one or the two eccentric grooves (5e) or a plurality of guiding mechanisms (51) extending through the lateral flanges (46a, 46e) of the drum (46) with its two shafts for the guide bearings (51a) or its shaft for the guide bearings (51a) and its articulated finger (49e) in the grooves (5e) directed in the flanges (46a, 46e).