Cleaning device

Abstract

The invention relates to a cleaning device for a printing press, comprising a contact profile (3). The contact profile (3, 3a) is placed in a recess (11) of a pressing segment (2, 2a), which forms a row.

Description

Technical Field

[0001] This invention relates to a cleaning device for a printing press, which includes a contact profile. Background Technology

[0002] In the cleaning device, during cleaning, the contact material or the roller is contacted indirectly through the cleaning cloth or directly through the contact material.

[0003] In this context, "roller" is also understood as "drum".

[0004] DE 196 11 125 C2 describes a cleaning device in which a profile rail contacts a cleaning cloth. Summary of the Invention

[0005] The objective of this invention is to provide an alternative cleaning device.

[0006] The task is accomplished by a cleaning device for a printing press, the cleaning device comprising a contact profile, characterized in that the contact profile is placed in a groove of a pressing section forming a row.

[0007] The advantages of this invention are:

[0008] Assembly time can be shortened by eliminating the settings required when assembling traditional cleaning devices.

[0009] The contact profile can be easily replaced.

[0010] The pressing section can be manufactured cost-effectively through plastic injection molding.

[0011] Common and advantageous profiles available on the market can be used as contact profiles.

[0012] The combination of the contact profile and the pressing section results in good compensation for the deflection and tolerances of these components.

[0013] Various expansions are possible:

[0014] The pressing sections can be placed close to each other in the row.

[0015] The contact profile can be configured as a conduit for liquids.

[0016] At least some of the pressing sections may each have a channel for liquid. For example, each second pressing section in the row is equipped with a liquid channel, while the remaining pressing sections in between do not have liquid channels. Here, liquid discharged from the pressing section equipped with a channel, for example onto the cleaning cloth, diffuses after discharge, for example due to the suction capacity of the cleaning cloth material. Thus, the discharged liquid can also reach the area of ​​the surface to be cleaned that aligns with the remaining pressing sections mentioned above.

[0017] The contact profile can have a circular outer perimeter, or it can be a very slender cylindrical shape.

[0018] The grooves may each have an arc-shaped inner contour.

[0019] The inner contour can extend over a circumferential angle greater than 180°.

[0020] The pressing segment can be held in a row between two stops solely by a clamping force existing between the respective pressing segment and the contact contour, wherein a small gap may exist between the pressing segments in the direction toward the row.

[0021] However, the pressing sections can also be pressed together under pressure.

[0022] Therefore, the pressing segments can be pressed together by their inherent elasticity or by the action of a spring.

[0023] The pressure can be generated by the inherent elasticity or (if present) by a spring supported on one of the pressing sections.

[0024] The pressing section supported by the spring can form the end of the row.

[0025] The pressing section can be movably seated in the supporting frame along the longitudinal direction of the frame and / or the row.

[0026] Another contact profile can be placed into the groove of another pressing section, wherein the two contact profiles extend parallel to each other.

[0027] The two ends of the contact profile can be secured to the end-side pressing sections by fixing elements to prevent detachment from the pressing sections, which form the two ends of the pressing section row. Otherwise, such detachment could occur unintentionally during operator maintenance, such as cleaning, of the cleaning device. If the contact profile is constructed as a hose, the two fixing elements can be constructed as either spring clips or plugs. The spring clip can be secured to the end-side pressing section, for example, by screws and engages with the hose end, for example, with a hook-shaped clamping end. The plug can be inserted into the hose end to press the plug against the inner contour of the groove in the outer pressing section. The section of the plug seated in the respective hose end can have a flattened portion that faces the surface to be cleaned during cleaning, such as the circumferential surface of the roller to be cleaned. The plug section can have a generally semi-circular cross-section due to the flattened portion and thus a generally cylindrical shape. Attached Figure Description

[0028] Further extensions can also be derived from the following description of the embodiments and the accompanying drawings, in which:

[0029] Figure 1 The cleaning device is shown in cross-sectional view.

[0030] Figure 2 Shown in longitudinal section Figure 1 The cleaning device in the middle,

[0031] Figure 3 A modified version with a swingable pressing section is shown.

[0032] Figure 4 A modified version with an integrated spring is shown.

[0033] Figure 5 A modification is shown in cross-sectional view.

[0034] Figure 6 Shown in longitudinal section Figure 5 Modifications in the middle,

[0035] Figure 7 Show Figure 5 and 6 The first variant of the modified version,

[0036] Figure 8 Show Figure 5 and 6 The second variant of the modified type,

[0037] Figure 9 A cleaning device with a scraper is shown.

[0038] Figure 10 Showing in partial view Figure 1 and 2 The cleaning device in the middle,

[0039] Figure 11 A cleaning device with two parallel contact profiles is shown.

[0040] Figure 12 Show Figure 11 Modification of the cleaning device in the middle,

[0041] Figure 13 Show Figure 12 The modified U-shaped pressing section in the middle,

[0042] Figure 14 Show Figure 12 The modified T-shaped pressing section in the middle. Detailed Implementation

[0043] exist Figures 1 to 14 In the figures, components with the same function are represented by the same reference numerals.

[0044] Figure 1 and2 A cleaning device is shown, having a support frame 1 that carries a pressing section 2 that presses a cleaning cloth 4 onto a rotating roller 5, such as a rubber blanket roller, via a contact profile 3. The cleaning cloth 4 is wound from a clean cloth roll onto a dirty cloth roll in a programmed manner or as needed and pressed onto the roller 5 via the contact profile 3 in a cloth section extending between the two rolls.

[0045] The pressing sections 2 form a row extending parallel to the rollers 5 along the longitudinal direction x of the support frame 1 and are pressed against each other by springs 6 along this longitudinal direction x. The springs 6 press against the pressing sections 2 at one end of the row, and the pressing sections 2 rest against the support 7 at the other end. The springs 6 are helical springs. In a modification not shown in the figures, the springs 6 are formed by the sidewall of the support frame 1 opposite the support 7, wherein this sidewall, and if necessary, the sidewall forming the support 7, is elastically constructed, for example, of the type of leaf spring or a spring-loaded metal plate.

[0046] Each pressing segment 2 is pressed against the roller 5 by a spring 8 in the lateral direction y (orthogonal to the longitudinal direction x). Each spring 8 has one end seated in a blind hole 9 in the corresponding pressing segment 2 and its other end supported on the rear wall 10 of the support frame 1. Here, these springs 8 are helical springs.

[0047] The pressing sections 2 are sliding members, capable of moving along the longitudinal direction x via spring 6 and along the lateral direction y via spring 8. During the movement of the pressing section 2 along the longitudinal direction x, spring 8 slides on the supporting frame 1. During the movement of one of the pressing sections 2 along the lateral direction y, it is laterally guided by the adjacent pressing section 2.

[0048] Contact profile 3 is made from commercially available semi-finished products such as round bars or wires and has a circular outer perimeter. Contact profile 3 is rubber-elastic and made of plastic. Pressing section 2 is made of plastic (which is advantageous for weight reasons) and can be manufactured by injection molding. The plastic of pressing section 2 (e.g., an elastomer) is harder or less elastic than the plastic of contact profile 3 (e.g., a thermoplastic).

[0049] The pressing sections 2 are identical in shape and size and can be advantageously formed into a modular system in which the manufacturer uses a smaller number of the same type of pressing sections 2 for short cleaning devices of narrow-web printing presses and a larger number of the same type of pressing sections 2 for long cleaning devices of wide-web printing presses.

[0050] The pressing section 2 has a groove 11 on its side facing the roller 5, in which the contact profile 3 is received. Each groove 11 has an arc-shaped inner contour whose diameter is exactly the same as the diameter of the contact profile 3, allowing it to be clamped into the groove 11. This inner contour extends at a circumferential angle greater than 180° and correspondingly surrounds the contact profile 3, thus securing the contact profile to prevent it from slipping radially out of the groove 11. For maintenance purposes, such as replacement due to wear, the contact profile 3 can be pulled axially out of the groove 11.

[0051] Each pressing section 2 has a stop protrusion 12 for securing the corresponding pressing section 2 to prevent it from sliding excessively out of the support frame 1 when the support frame is disengaged from the roller 5 by swinging around the hinge 13. All the stop protrusions 12 of the pressing sections 2 engage in the same groove 14, which extends longitudinally x in the support frame 1. Other form-fitting fixations to prevent excessive sliding of the pressing sections 2 out of the support frame are also possible, for example, using grooves introduced into the pressing sections and track-shaped stop protrusions on the support frame that engage in the grooves.

[0052] Each pressing section 2 has a bevel or chamfer 15 on the right and left sides of its groove 11, wherein the two chamfers 15 converge toward the contact profile 3. The groove 11 extends into the two chamfers 15, and these chamfers make the transition of the contact profile 3 from pressing section 2 to pressing section 2 smooth, such as... Figure 10 As can be seen in the image. This is advantageous if adjacent pressing sections 2 spring into the support frame 1 to varying degrees due to unevenness on the side of the roller 5 to be cleaned. Alternatively, a rounded portion with the same function can be provided instead of the chamfer 15.

[0053] Figure 3 Show Figure 1 and 2 A modification of the cleaning device in [the context]. Figure 3 as well as Figure 2 , 4 In 6, 8, and 10, the cleaning device 4 is not shown for simplified illustration. In this modification, each pressing segment 2 can swing about the hinge 16 via the spring 8, wherein one component of this swinging motion is in the lateral direction y and therefore points toward the roller 5. The pressing segment 2 is connected to the hinge pin 18 via the lever 17, which is arranged in the hinge housing 19, which is introduced into the support frame 1. The hinge housing 19 can be composed of a single continuous, unique segment or (as shown) two segments at opposite ends of the diameter. The corresponding pressing segment 2, lever 17, and hinge pin 18 together form a unique element and can be driven by the spring 6 ( Figure 2The spring 8 moves longitudinally along the hinge housing 19. One end of the spring 8 is supported on the support frame 1, and the other end is supported on the lever 17. The swing angle of the pressing section 2 is limited by the end stop 20. In operation, the pressing section 2 is not against the end stop 20.

[0054] Figure 4 A modification is shown in which a pressing section 2 and a spring 8 are formed together as a single piece. The spring 8 is formed, for example, as a leaf spring on the pressing section 2. The introduced groove 11 and the formed spring 8 are located on opposite sides of the respective pressing section 2.

[0055] Figure 5 and 6 A modification is shown in which the contact profile 3 is constructed as a hollow profile and serves as a conduit for the cleaning fluid. The contact profile 3 here also has a circular outer perimeter and can be made of pipe or hose, which are common semi-finished products on the market, thus keeping manufacturing costs low. Drain openings 21 for the cleaning fluid are introduced into the wall of the contact profile 3 in a row along its length.

[0056] A first detergent is used as the first cleaning fluid, a second detergent as the second cleaning fluid, and water as the third cleaning fluid for rinsing. A supply line 23 branches off from the first collection line 22 for the first cleaning fluid, leading to the press section 2 with odd-numbered positions inside the press section 2, and a supply line 25 branches off from the second collection line 24 for the second cleaning fluid, leading to the press section 2 with even-numbered positions inside the press section 2. Thus, the press section 2 inside the press section 2 is alternately supplied with the first and second cleaning fluids. Depending on the type of printing ink, either the first or second cleaning fluid can be used in the corresponding printing operation, and the corresponding collection lines 22 and 24 are activated by opening the valve. The contact profile 3 is equipped with a connector 27 for the third cleaning fluid, which exits from the discharge opening 21 and reaches the cleaning cloth 4.

[0057] Figure 7 The diagram illustrates a possible configuration of supply lines 23, 25 as tubes inserted into the pressing section 2. Length compensation is achieved by submerging the supply lines 23, 25 either deeply or shallowly into the pressing section 2 during movement of the pressing section 2 in both the longitudinal and anti-lateral directions y. Each supply line 23, 25 leads into a channel 28, which exits through a discharge opening 29 that leads into the corresponding pressing section 2. A third cleaning fluid is sprayed, for example, from this discharge opening 29, to a cleaning cloth 4, which... Figure 7The parts are shown spaced relative to the contact profile 3 for clear reasons, but are actually attached to the contact profile. An O-ring type sealing device 30 is arranged between the corresponding pressing section 2 and the supply lines 23, 25 extending into the pressing section.

[0058] Figure 8 The supply lines 23 and 25 are shown as alternative constructions to corrugated hoses, which expand or contract when the pressing section 2 moves.

[0059] Figure 9 A cleaning device is shown in which the roller 5 to be cleaned is a roller of the ink mechanism or dampening mechanism of a printing press. The printing press can (as in the embodiments described above) be an offset printing press, especially for printing sheets.

[0060] Figure 9 The cleaning device in this model differs from the previously described cleaning device only in the following characteristics: the cleaning cloth 4 is omitted, and the contact profile 3 directly contacts the circumferential surface of the roller 5 during cleaning. The contact profile 3 is a scraper that scrapes away liquid (printing ink or wetting agent-ink mixture) from the rotating roller 5, where the scraped liquid is collected in the pool trough 31. The contact profile 3 does not have a circular outer contour, but rather a complex outer contour, forming a blade 32 and a T-shaped groove 33. The contact profile 3 is placed into the groove 11 with the T-shaped groove 33, which is introduced into the pressing section 2 as a T-shaped groove. The cross-section of the contact profile 3 has the smallest possible resistance torque in the transverse direction y.

[0061] A foil 34 is clamped between the contact profile 3 and the pressing section 2. The foil 34 covers the movement gap between the pressing sections 2 and prevents scraped liquid from entering the movement gap.

[0062] Figure 11 A cleaning device is shown in which a first row of first pressing sections 2a and a second row of second pressing sections 2b are movably placed into a frame 1, wherein the two rows are parallel to each other in the longitudinal direction x (orthogonal to each other). Figure 11 (The drawing plane) extends. The first contact profile 3a is clamped in the groove 11 of the first pressing section 2a, and the second contact profile 3b is clamped in the groove 11 of the second pressing section 2b. For the construction and support of the second pressing section 2b and for the second contact profile 3b, refer to... Figure 1 and 2 The descriptions given for the cleaning device also apply to its reusability. These descriptions also apply to the construction and support of the first pressing section 2a.

[0063] Figure 11The special feature of the cleaning device shown is, on the one hand, the “double-layer arrangement” of the first and second pressing sections 2a and 2b, and on the other hand, the different shapes of the first and second contact profiles 3a and 3b.

[0064] In this "double-layer arrangement," the first pressing section 2a is movably supported on the second pressing section 2b. Each first pressing section 2a guides the second pressing section 2b as it moves laterally (y) toward the roller 5 and in the opposite direction. Each second pressing section 2b guides the first pressing section 2a as it moves laterally (y) toward the roller 5 and in the opposite direction. The mutual support and mutual guidance of the pressing sections 2a and 2b result in a compact and cost-effective structure.

[0065] The different shapes of the two contact profiles 3a and 3b allow the first contact profile 3a to gently wipe the roller 5 with the cleaning cloth 4, while the second contact profile 3b vigorously wipes the roller 5 with the cleaning cloth 4. The first contact profile 3a is an elastic rod with a double-T shaped cross-section, wherein the wider crossbeam of the double T contacts the cleaning cloth 4 and the narrower crossbeam is inserted into the groove 11 as a T-groove. The second contact profile 3b is an elastic round rod or wire.

[0066] Because the first contact surface formed between the first contact profile 3a and the roller 5 with the cleaning cloth 4 placed in the middle is larger than the contact surface formed between the second contact profile 3b and the roller 5 with the cleaning cloth 4 also placed in the middle, the surface pressure in the first contact surface is less than the surface pressure in the second contact surface. To enhance this effect, the spring 8 of the first pressing section 2a is constructed with a lower spring force or is constructed to be softer than the spring 8 of the second pressing section 2b, and / or the material forming the first contact profile 3a is softer (lower Shore hardness) and / or more elastic than the material forming the second contact profile.

[0067] The first contact profile 3a acts on the roller 5 in front of the second contact profile 3b along the rotation direction of the roller 5. However, in specific applications, it is also possible to arrange the two contact profiles 3a and 3b, and thus the two rows of pressing sections 2a and 2b, in an alternating manner.

[0068] Figure 12 A cleaning device is shown, in which the first contact profile 3a and the second contact profile 3b, as already described, are also present. Here, the pressing sections 2a and 2b can swing about a common geometric axis of rotation RA, wherein a component of the swinging motion of the respective pressing sections 2a and 2b is in the lateral direction y and thus points toward the roller 5. Each first pressing section 2a, together with a second pressing section 2b, is supported in a sliding member by a hinge defining the axis of rotation RA.

[0069] A first spring 36 is pre-tensioned between the sliding member 35 and the first pressing section 2b, and a second spring 37 is pre-tensioned between the sliding member 35 and the second pressing section 2b. The first and second springs 36 and 37 press the pressing sections 2a and 2b (which form levers here) together with the contact profiles 3a and 3b onto the roller 5, wherein the cleaning cloth 4 is positioned between the roller 5 and the contact profiles 3a and 3b. Here, the pressing sections 2a and 2b swing in opposite directions: the first pressing section 2a swings counterclockwise and the second pressing section 2b swings clockwise. A third spring 38 is pre-tensioned between the sliding member 35 and the support frame 1, causing the sliding member 35 to move in the lateral direction y.

[0070] Sliding members 35 form rows extending in the longitudinal direction x and are each capable of moving in the longitudinal direction x. Sliding members 5 are preferably connected in the longitudinal direction x by springs 6 (…). Figure 2 (The spring here presses against the slide member 35 at the end of the slide member row) under pressure caused by or through the inherent elasticity of the slide member 35, causing them to abut against each other. Each slide member 35 can be aligned along the load-bearing frame 1 (orthogonal to) Figure 12 The drawing plane moves and its abutment 12 moves in the groove 14 of the supporting frame 1.

[0071] Figure 13 The diagram schematically illustrates one of the first pressing sections 2a, which has a section of a first contact profile 3a inserted into the first pressing section 2a. The first pressing section 2a has a U-shape, wherein a second pressing section 2b is inserted between two forks 39 of the U-shape. Figure 14 The diagram is shown schematically.

[0072] Figure 14 The second pressing section shown has a T-shape, with a crossbeam 40 and a longitudinal beam 41. The crossbeam 40 carries a section of the second contact profile 3b, and the longitudinal beam 41 is positioned between the two forks 39 of the first pressing section 2a in the final assembled state of the cleaning device.

[0073] Thus, each sliding member 35, the first pressing section 2a carried by the sliding member, and the second pressing section 2b carried by the sliding member 35 together form a unit that can be adjusted not only along the longitudinal direction x but also along the transverse direction y.

[0074] List of reference numerals

[0075] 1. Load-bearing frame

[0076] 2 Pressing Section

[0077] 3. Contact Profile

[0078] 4. Cleaning cloth

[0079] 5 rollers

[0080] 6 springs

[0081] 7 supports

[0082] 8 springs

[0083] 9 Blind Holes

[0084] 10. Rear wall

[0085] 11 Grooves

[0086] 12 Stop protrusions

[0087] 13 Hinges

[0088] 14 slots

[0089] 15. Bevel

[0090] 16 Hinges

[0091] 17. Leverage

[0092] 18 Hinge pins

[0093] 19 Hinge Case

[0094] 20 Terminal stop

[0095] 21 Discharge opening

[0096] 22 Collection Pipeline

[0097] 23 Supply pipeline

[0098] 24 Collection Pipeline

[0099] 25 Supply pipeline

[0100] 26 Discharge opening

[0101] 27 Connector

[0102] 28 channels

[0103] 29 Discharge opening

[0104] 30 Sealing device

[0105] 31. Pool / Trough

[0106] 32 blades

[0107] 33 T-slot block

[0108] 34 foil

[0109] 35 Sliding component

[0110] 36 Springs

[0111] 37 Springs

[0112] 38 Springs

[0113] 39 Fork Arm

[0114] 40 crossbeams

[0115] 41 Longitudinal beam

[0116] 2a Pressing section

[0117] 2b Pressing Section

[0118] 3a Contact Profile

[0119] 3b Contact Profile

[0120] RA rotation axis

[0121] x Vertical direction

[0122] y represents the horizontal direction.

Claims

1. A cleaning device for a printing press, comprising a contact profile (3), characterized in that, The cleaning device includes a support frame (1) that carries pressing sections (2), each pressing section (2) being pressed against a roller (5) by a spring (8), the contact profiles (3, 3a) being placed in grooves (11) of the pressing sections (2, 2a), the pressing sections forming a row, wherein each pressing section (2, 2a) has chamfers (15) on the right and left sides of its groove (11), wherein two chamfers (15) converge toward the contact profiles (3, 3a), and the groove (11) passes into the two chamfers (15).

2. The cleaning device according to claim 1, characterized in that, The pressing sections (2) are attached to each other in the row.

3. The cleaning device according to claim 1, characterized in that, The contact profile (3) is constructed as a conduit for liquids.

4. The cleaning device according to any one of claims 1 to 3, characterized in that, At least some of the pressing sections (2) have channels (28) for liquid.

5. The cleaning device according to any one of claims 1 to 3, characterized in that, The contact profile (3) has a circular outer perimeter.

6. The cleaning device according to any one of claims 1 to 3, characterized in that, The grooves (11) each have an arc-shaped inner contour.

7. The cleaning device according to claim 6, characterized in that, The inner contour extends over a circumferential angle greater than 180°.

8. The cleaning apparatus according to any one of claims 1 to 3, characterized in that, The pressing sections (2) are pressed together under pressure.

9. The cleaning device according to claim 8, characterized in that, The pressure is generated by a spring (6) which is supported on one of the pressing sections (2).

10. The cleaning device according to claim 9, characterized in that, The pressing section (2) supported on the spring (6) forms the end of the row.

11. The cleaning apparatus according to any one of claims 1 to 3, characterized in that, The pressing section (2) is movably seated in the support frame (1) along the longitudinal direction (x).

12. The cleaning apparatus according to any one of claims 1 to 3, characterized in that, Another contact profile (3b) is placed in the groove (11) of another pressing section (2b), wherein the two contact profiles (3a, 3b) extend parallel to each other.

Images