DE2904763C2 - Device for conveying or pressing sheets or belts - Google Patents

Description

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The invention relates to a device for conveying or pressing sheets or belts, in particular of photographic substrates, with at least one pair of rollers on a processing device, wherein the two axle pieces of one roller run in fixed bearings, while the counter roller in two arms directed towards the opposite side with respect to the fixed roller is movably mounted that it can be pressed against the fixed roller by spring force.

In known devices of the type mentioned are for resilient holding together of the Rollers commonly used coil springs made of steel. Ordinary spring wire is because of the risk of corrosion due to the aggressive processing fluids for the photographic recording media not to use. The springs made of high-alloy stainless steel that have been used so far have inferior Spring properties that can also vary by up to 20% for each spring. Besides, there are such Springs extremely expensive.

From DE-OS 27 32 973 leaf springs are known, which the movable bearing in the direction of press the fixed roller. Except for the fact that in this case, too, a metal spring Is used in all known bearing arrangements is the assembly of the bearings or the removal a roller relatively cumbersome.

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The object of the invention is therefore to design a device of the type mentioned at the outset in such a way that assembly is facilitated by simple means and ease of maintenance is increased.

This object is achieved by the characterizing features of claim 1.

With the invention, an inexpensive warehouse is created in which without additional assembly time the rollers are simply inserted and easily removed for service and cleaning purposes can. Metallic springs or other additional parts can be omitted, fixed and pressure bearings can be used expediently be injected from one part.

Further details and advantages of the invention emerge from the related subclaims with the description of exemplary embodiments, which are explained in detail with reference to figures. It shows

F i g. 1 is a side view of the device; Fig. 2 shows a cross section H-II from Fig. 1;

Fig. 3 is a view on an enlarged scale of the in Fi g. 1 shown Lagersund

Figure 4 is a perspective view of another embodiment of the device.

1 and 2, 1 is a double bearing forming fitting called. An axle 3 of a roller 4 is mounted in a bore 2. On the molded part 1 a yielding bearing is also formed, which

essentially two mutually parallel elastic arms 5 and 6, which by a on the Form piece existing ring part 7 are connected to each other. In the camp 5, 6, 7, which is based on the F i g. 3 is to be explained in more detail, the axis 8 of a counter roller 9 is used according to the above For example, the rollers 4 and 9 are coupled to one another in terms of movement via gear rims 4 'and 9', respectively

On the molded piece 1 - there are also two guide webs 10 and 11 that run parallel to one another formed, which limit the axial movement of the counter roll 9. Finally, on the sides of the Molded part 1 guide elements 12 and 13 are provided, which facilitate the introduction of the molded part 1 into recesses serve a container wall, not shown.

In Fig. 3, the elastic bearing is shown on an enlarged scale elastic arms 5 and 6 is equal to the diameter of the axis 8. The ring part 7 has an inner curvature which is the same as the cylindrical outer surface of the axis 8. The arms 5 and 6 extend from the ring part 7 and run preferably in the direction in which a movement of the counter roll 9 relative to the fixed Roller 4 is provided. The molding 1 with the ring part 7 and the elastic arms 5 and 6 is made a material, preferably made of thermoplastic material, formed that with a certain strength of the Arms 5 and 6 give them such elasticity that they can be bent away from the axis 8 somewhat.

At the ends of the elastic arms 5 and 6 remote from the ring part 7, protruding lugs 5a and 6a are formed, the distance from one another is less than the diameter of the axis 8. The ends of the arms S and 6 are slightly bent towards one another so that the lugs 5a and 6a engage behind the axis 8 when the roller 9 is inserted. The line of contact of the noses 5a and 6a runs in a plane N or N ', which runs through the center line M of the axis 8 and assumes an angle or oC to a plane L also running through the axis center M and parallel to the transport direction F. . The angle a. or λ 'is greater than 30 and less than 75 degrees, preferably between 40 and 50 degrees. The choice of the angle α is essentially dependent on the elasticity of the arms 5 and 6. «

As can be seen in Fig. 3 with dash-dotted lines is, the mating roller 9 gives way when conveying or pressing a material 14, which in the transport direction F between the rollers 4 and 9 is passed, in the direction of the arms 5 and 6 from. While at the touch of the Rolls 4 and 9 without material, the axis 8 on the parallel walls of the arms 5 and 6 and on rests against the noses 5a and 6a, the axis 8 only lies against the rear-engaging ones during material transport Lugs 5a and 6a, after which the arms 5 and 6 are inclined due to the pressure of the axis 8 on the lugs 5a and 6a are bent outwards and thus occupy a greater distance than the axis diameter from one another. Due to the elasticity of the arms 5 and 6, they assume their parallel alignment again, as soon as no more material is fed between rollers 4 and 9.

The elastic properties of the arms 5 and 6 can now be used for cleaning purposes or at a Defect the counter roller 9 can be removed from the warehouse with one grip without tools. How out the F i g. 2 can be seen, the arms 5 and 6 and the lugs 5a and 6a have a width which is slightly larger than that Diameter of the axis 8, so that an exact guidance of the counter roller 9 is guaranteed when using of materials with different thickness increases in the device according to the invention Pressure force with greater material thickness is less than with conventional suspensions. At a Mehi> No bearing defects occur either with lattice coating or jamming, as in extreme cases the roller is out of the bearing can unclip. It is not possible to overstretch springs or burst parts.

For the molded piece 1, all high-polymer plastics are suitable in the broadest sense, depending on the type of use. As already mentioned above, thermoplastics show particularly favorable properties.

The based on the F i g. 1 to 3 described device is particularly suitable when the bearing in vertical arrangement is used, that is, that the two rollers 4 and 9 are one above the other. at Numerous applications, however, the rollers in a horizontal plane or in a Be inclined to it. A further development of the device according to the invention is suitable for such applications, as shown, for example, in FIG. 4 is shown. The essentially the same parts have the same Reference numerals on.

The slightly modified fitting 1 also has two bearing arms 14 and 15 aul, which are extend parallel to the elastic arms 5 and 6 and arranged in the axial direction next to these arms are. The bearing arms 14 and 15 are rigid and their inner surfaces facing each other also have a distance equal to the diameter of the axis 8.

The bearing arms 14 and 15 can merge directly into the guide webs 10 and 11, so that a relatively simple shape is formed.

The bearing arms 14 and 15 have the task of bearing the weight of the dash-dotted line in FIG To take over illustrated roller 9. After no projections are provided on the bearing arms 14 and 15 are, the counter roller 9 can be easily inserted, only the force of the elastic Arms 5 and 6 need to be overcome. Even if the weight of the roller 9 of one of the Bearing arms 14 or 15 is carried, the pressure of the counter roller 9 on the fixed roller 4 is nonetheless caused by the spring force of the arms 5 and 6, which with their lugs 5a and 6a a certain pressure force in the direction of the fixed roller 4 on the axis 8 of the roller 9.

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: 1. Device for conveying or pressing sheets or belts, especially photographic ones Layer carriers, with at least one pair of rollers on a treatment device, the two Axles of one roll run in fixed bearings, while the counter roll runs in two with respect to the fixed roller to the opposite side directed arms in such a way is movably mounted so that it can be pressed against the fixed roller by spring force, characterized in that the anne (5, 6) are elastic and at their ends facing each other, the axes (8) of the counter roll (9) have noses (5a, 6a ^) reaching behind and symmetrically resting on them. 2. Apparatus according to claim 1, characterized in that the elastic arms (S, 6) to each other run parallel at a distance equal to that The diameter of the axis (8) 3. Apparatus according to claim 1 or 2, characterized in that the arms (5, 6) parallel to the run through the axes (8,3) of the rollers (9,4) plane. 4. Device according to one of claims 1 to 3, characterized in that the elastic arms (5, 6) are connected to one another by a ring part (7), the radius of which is equal to the diameter of the Axis (8) is. 5. Device according to one of claims 1 to 4, characterized in that the ends of the elastic arms (S, 6) carrying the lugs (53, 6a) are angled to one another. 6. Device according to one of claims 1 to 5, characterized in that the point at which the lugs (5a, 6a) rest symmetrically on the axes (8) of the counter-roller (9) used lies in a plane (N or N ') running through the axis center (M) , soft with a plane (L ) also running through the center of the axis (M) and parallel to the transport direction of the material (14) occupies an angle (α or λ ') which is greater than 30 degrees and less than 75 degrees, preferably 40 to 50 degrees. 7. Device according to one of claims 1 to 6, characterized in that for a sufficient Spring force of the arms (5, 6) these have an extension in the axial direction, the length of which is dependent of the material used 8. Device according to one of claims 1 to 7, characterized in that the elastic Arms (5, 6) axially offset bearing arms (14, 15) extending in the same direction are provided are, the distance between which is equal to the diameter of the axis (8) of the counter roller (9). f>. Device according to one of Claims 1 to 8, characterized in that the fixed bearing (2), the ring part (7), the elastic arms (5, 6) and optionally the bearing arms (14, 15) are formed on a single molded piece (1; 1 '). 10. Apparatus according to claim 9, characterized in that for holding the shaped piece (1; 1 ') guide elements (12, 13) are provided on this. 11. Device according to one of claims 1 to 10, characterized in that the shaped pieces (1; V) consist of high-polymer plastic, preferably of thermoplastic plastic.