DE3203887A1 - Foam-covered feed roll - Google Patents

Abstract

A foam-covered feed roll for a dry-particle feed apparatus is proposed, in which there takes place an only insignificant penetration of the dry particles into the foam.

Description

Foam-coated food roll

Foam-coated food roll The invention relates to a method and a device for dispensing dry particles, in particular a foam-coated one Food roll for use in a dry particulate feeding apparatus and method for the production of such food rolls.

Dry particle feeders are well known and can be found in many Areas of application. One area in which these devices are particularly useful is the dosed release of dry dye particles in the copier ~ Plain paper ~ type. It is also known to be elastic in these eating appliances Rollers to be used as a means of dispensing a metered amount of dry particles These elastic or resilient roles are partly made of foam and are rotatably mounted in the feed funnel of the feeding apparatus, whereby they are firmly against the walls of this feed funnel are pressed against it. When turning the roll will be the dry particles are discharged from a slot on the feed hopper base, which is directly on the role.

The release of dry particles takes place through the rotating roller through the action of several mechanisms.

It is believed that these mechanisms are predominant the transport of the particles in the open cells or cavities of the foam consists. As the roller continues to rotate, the particles fall due to the effect of gravity out of these open cells through the gap. This mechanism is obviously conditional a corresponding position of the role inside the apparatus in the sense that they must be above the gap. To further promote the release of particles the device is equipped with a blade that compresses the foam a little and thus supports the particles from falling out of the foam cells.

Another mechanism that explains the release of particles is the sandwiching of the particles between the roll and the feed hopper walls. When the roller is rotated, these sandwiched particles are forcibly captured conveyed along between the roller and the feed hopper wall until it is reached the gap from which the particles fall out under the influence of gravity.

It could be observed that the release of dry particles aleatoric for apparatus equipped with foam-coated food rolls is.

This aleatoric functioning is primarily attributed to penetration the particles back into the cell structure of the foam. The ones normally used Food rolls are low density and low due to necessity To have to have compression module, due to an open cell structure with large Cells marked.

The connections between the individual cells are also right large because the foam consists essentially of a network. For this Basically, the particles get caught in the foam and will not be released again. Even the effect of the blades on the foam is not enough to keep the trapped Dissolve particles. Due to the deep penetration of the particles into the foam the functionality of the food roll also decreases, as the concentration increases trapped particles reduce the elastic properties of the roll.

The task is to avoid these disadvantages of the prior art of the invention, a new and improved foam-lined food roll of the to propose the genus mentioned at the outset, in which an only insignificant penetration of dry particles in the foam takes place.

This task is based on a foam-coated Food roll of the type mentioned at the beginning, by the in the license plate of the main claim as well as by a method according to the characteristics of claims 7 and 8 cited features solved.

The proposed foam-lined food roll is made, by placing a foam layer, preferably made of mechanically foamed material, on the roll core Urethane, is poured on. The solidified foam layer obtained in this way has a much greater density than the previously known foam layers with the Result that the cavities or cells are significantly smaller than before and from im are substantially uniform, spherical in shape. Furthermore are with this Open-cell structure the connecting ~ windows ~ between the cells are much smaller than the cells themselves, and therefore much smaller than the interconnections after the state of the art.

This reduced cell size makes it difficult for dry particles to penetrate and thus reduces the related problems with the previous foams -coated food rolls. However, this reduced cell size makes it more difficult also the functioning of the main mechanism for particle delivery, i.e. the uptake and further transport of the particles in the open cell structure. In order to compensate for this reduction in the conveying mechanism, the foam layer must be modified.

This required modification of the foam layer can be different Way. It was found that with a reduction in the roll diameter compared to that of the known foam-coated food rolls and at constant feed hopper dimensions, the amount of particles conveyed can be enlarged. This makes it possible to use a comparable amount of particles how to promote with the familiar roles. In the proposed role there is hence the main conveyance mechanism in sandwiching the particles between the foam layer and the hopper walls. In contrast to the known roles is the irregular promotion with the proposed roles of particles thanks to the smaller cell size of the foam coating.

Another method of modifying the foam coating consists in providing grooves on the outer surface of the foam layer. By Careful choice of the number and size of these grooves can achieve the desired delivery rate be achieved. Here, too, the particles are released regularly and not aleatoric.

In summary, it can be said that the proposed The feed roller ensures that a desired amount of particles is evenly conveyed out of the Feeding apparatus made possible.

Embodiments of the invention are shown in the drawings, in which like parts are provided with the same reference numerals, shown and will be described in more detail below. FIG. 1 shows a schematic cross section through a food apparatus with a foam-coated food roll Figure 2, the perspective view of a first embodiment of a foam-coated Feed roll Figure 3, a perspective view of a second embodiment of a foam-coated food roll.

The invention relates to a foam-coated roll for use in a dry particle feeder. Such food appliances can be found in many areas However, the present invention is intended to apply to a food apparatus # which dry dye particles in plain paper copier machines gives away. In these food appliances, the dye particles are absorbed by the effect fed by gravity to a foam-coated roller, which in turn these particles under the action of gravity through an adjacent feed slot conveyed out of the machine, the general configuration of a dry particulate feeder is shown with the reference number 10 in FIG. The apparatus 10 consists of a hopper or container 12 and a roller 14. The container 12 has four Side walls and is open at the top and bottom. The container 12 serves as a slide to to feed dye particles 16 to roller 14 under the action of gravity, This is generally achieved by having two opposing walls of the Container 12 run obliquely downwards towards each other, so that the bottom opening is much smaller than the upper opening, the container 12 is also in the A blade 24 is provided in the area of the lower edge of one of the two inclined walls.

The function of this blade 12 is described below.

The container 12 can be made of any suitable material with sufficient consist of great rigidity in order to compress the roller 14 can.

The roller 14 is rotatably mounted on the container 12, this happens advantageously in that the roller 14 has shaft ends 18 which through Push openings in the side walls (not shown) of the container 12 through and are advantageously stored there. At least one of these shaft ends 18 is coupled to a motor (not shown) for driving the roller 14. the Roller 14 consists of a core 20 and a foam coating 22. The core 20 may be made of any suitable material of sufficient rigidity preferably made of steel. The roller 14 is mounted in the container 12 in such a way that the plastic layer 22 is slightly compressed by the inclined walls of the container 12 will.

The plastic coating 22 is preferably made of a urethane foam. This plastic layer 22 has an open cell structure, the individual Cells communicate with each other through "windows ~" A preferred layer of plastic 22 has approximately spherical cells with average diameters in the Of the order of magnitude between 100 and 250 micrometers, with the ~ windows ir average Have diameters on the order of 25 to 75 micrometers.

This mass is much smaller than the previous one used foam layers. The decreased cell and ~ window ~ # dimensions decisively reduce the penetration of the particles into the cell structure. This reduction in cell and window dimensions also has an effect certain properties of the proposed foam coating in comparison to those previously used. The table below presents these various properties and the differences between conventional foams and the proposed one Uretane foam out.

conventional proposed foam foam compression deformation, 22 h at 700 C, 50% compression% of the original thickness 30 3 breaking strength, bar 1.26 3.15 elongation at break,% 140 120 compression deformation, tension at 25% compression, bar 0.035 0.245 As a result of the reduced cell and II window dimensions and along with other property differences, particularly compression deformation the foam proposed for the coating 22 behaves differently than that previously used.

The most important difference is the diminution the Property of absorbing dry particles in the open cells of the foam , The foam coating is also less compressible, reducing the amount of the particles sandwiched between the foam coating and the Containers turn are captured, is reduced to ensure that the desired amount of particles 16 is released, the foam coating 22 appropriately modified to compensate for this reduced conveying capacity.

FIG. 2 shows the perspective view of a first roller 14. There is a first possibility of modifying the foam coating 22 therein, their overall diameter compared to that of conventional foam coatings to diminish.

By this measure, the desired quantity of particles 16 between the foam coating 22 and the walls of the container 12, see above as shown in Figure 1, can be compressed. The reduction in the diameter of the Foam coating 22 takes place as a function of the amount to be passed through Particles.

This amount will vary from application to application.

In Figure 3 is another method of modifying the foam coating 22 shown. In this modification, grooves 26 are of suitable depth for dispensing the desired amount of particles in the layer 22 is provided. Number, execution and depth of the grooves 26 also vary here from application to application Figures 2 and 3 shown technical modifications allow a larger Amount of particles between the foam layer and the walls of the container 12 to compress this is essential, as in contrast to the previous foam coatings the particles 16 do not significantly enter the cell structure of the foam coating 22 penetrate and thereby not primarily in this way be promoted through the shift. As with conventional foam coatings A particle accumulation on the surface can also temporarily form on the layer 22 build up. These particles can be caused by static electricity and other reasons adhere to the surface of layer 22. By providing the blade 24 on the container 12, the surface of the layer 22 is covered by these adhering particles freed.

The foam coating 22 around the core 20 is preferred performed according to the following procedure. The core 20 is not in a suitable one Shown mold placed and positioned there.

This mold is designed accordingly to a foam layer 22 to be able to apply around the core 20. The layer 22 is formed by that, with the help of suitable means, a mechanically foamed Ureihan genic in the Mold is injected. So that a good connection between the core 20 and the Layer 22 is ensured, an adhesive is used before coating with layer 22 applied to the surface of the core 20.

Even if only preferred embodiments of the invention are described and have been shown, various modifications and substitutions can still be made be made without departing from the scope of the invention. Accordingly, it should be noted that the invention is an illustration and not has been described restrictively.

Claims (8)

"Foam-coated dining roll claims 1. Foam-coated Food roll for use in a dry particulate feed apparatus (10) having two opposite walls converging obliquely downwards, which create a gap to deliver the particles (16 form, a cylindrical food roll core (20 which rotatable in the dry particle feeding apparatus (10) in the vicinity of the particle discharge gap is mounted with a peripheral foam coating (22) of the feed roll (14), which are slightly pressed together by the inclined walls of the feeding apparatus (10) is, wherein the foam layer (22) with the rotation of the feed roller (14) the particles (16 are captured and transported along the wall, d u r c h g e does not indicate that the foam layer (22) in terms of thickness and The elasticity is such that the desired amount of dry particles (16 ) is conveyed, and that the foam coating (22) consists of a foam with an average cell diameter of less than 250 microns. 2. Foam-coated feed roll for use in a dry particulate feeder (10 with two opposite walls converging at an angle at the bottom, which form a gap for the delivery of the particles (16), a cylindrical feed roller core (22), which is in the dry particle feeding apparatus (10) in the vicinity of the particle discharge gap is rotatably mounted, with a peripheral foam coating (22) of the feed roller (14), which is slightly compressed by the inclined walls of the food apparatus (10) the foam layer (22) upon rotation of the feed roller (14 ) the particles (16) are captured and conveyed along the wall, d a d u r c h NOT A SIGNED that the foam layer (22) with at least one first groove (26) of suitable depth and width is provided to enable the delivery of a desired amount of dry particles (16) , and that the foam coating (22) consists of a foam with an average Cell diameters less than 250 micrometers. 3. Foam-coated food roll according to claim 1, d a d u r it is noted that the foam layer also has connection openings between said cells, said connection openings having an average Less than 75 microns in diameter. 4. Foam-coated food roll according to claim 2, d a d u Note that the foam layer has connection openings between said cells, said connection openings having an average Less than 75 microns in diameter. 5. Foam-coated food roll according to claim 3, d a d u r it is noted that the foam layer (22) is made from a foam with an average cell diameter of 100 to 250 micrometers , and that the connecting openings between the cells have an average 25 to 75 micrometers in diameter. 6. Foam-coated food roll according to claim 4, d a d u r it is not noted that the foam light (22) forms Foam cells with an average diameter of 100 to 250 microns has and communication openings between the cells with an average diameter from 25 to 75 microns. 7. Method of making a foam-lined food roll for use in a dry particle feeding apparatus with two opposite, downward sloping walls, which one Dispensing slot for the particles, there is no sign of the manufacturing process a foam mixture, which at the end consists of a foam with an average Cell diameter less than 250 microns, positioning a roller core in a mold designed for this purpose, which allows the application of a foam layer to be carried out around the core permits the coating of the outer surface of the core with an adhesive, injecting the foam mixture into the mold, solidifying the foam mixture, the removal of the foam-covered roll core from the mold , the removal of the outer skin and the sprouting from the foam layer, machining the foam coating to achieve a desired diameter the same in order to ensure the desired amount of dry particles released , and mounting the foam-lined roll in a dry particle feeder. 8. The method according to claim 7, g e k e n n -z e i c h n e t d u r c h forming at least one first groove of suitable depth and width in the surface of the foam coating in order to achieve the desired quantity delivery of dry particles.