EP0665962B1 - Systeme de frein pneumatique pour un support d'enregistrement - Google Patents
Systeme de frein pneumatique pour un support d'enregistrement Download PDFInfo
- Publication number
- EP0665962B1 EP0665962B1 EP93914634A EP93914634A EP0665962B1 EP 0665962 B1 EP0665962 B1 EP 0665962B1 EP 93914634 A EP93914634 A EP 93914634A EP 93914634 A EP93914634 A EP 93914634A EP 0665962 B1 EP0665962 B1 EP 0665962B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- vacuum
- rotary piston
- saddle
- valve channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6517—Apparatus for continuous web copy material of plain paper, e.g. supply rolls; Roll holders therefor
- G03G15/6526—Computer form folded [CFF] continuous web, e.g. having sprocket holes or perforations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
- B65H23/245—Suction retarders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/68—Reducing the speed of articles as they advance
- B65H29/686—Pneumatic brakes
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
- G03G2215/00413—Fixing device
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00666—Heating or drying device
Definitions
- Pneumatic braking devices for a record carrier are used in electrographic printing or copying devices.
- the recording media used in these devices mostly consist of paper or plastic films in single sheet or tape form.
- the recording media are transported between transport rollers over sliding surfaces. In some cases it is necessary to brake the record carrier on the sliding surfaces and smooth it in cooperation with the transport rollers. At such points, suction openings are provided in the sliding surfaces, which are coupled to a vacuum-generating device.
- An example of such an application is the fixing device of an electrographic printing or copying device.
- a recording medium provided with toner images must run through a fixing station.
- the toner image is melted into the recording medium.
- known fixing station can consist of two rollers - a fixing roller and a pressure roller - of which at least one is heated and one is motor-driven, and a preheating device arranged in front of the rollers, eg a heated saddle.
- the flawless functioning of the fixing process requires that the recording medium lies closely against the preheating saddle. To do this, the record carrier must be stretched over the saddle.
- a braking device can be provided in front of the saddle, as seen in the direction of movement of the recording medium.
- the pneumatic brake device has the advantage that the record carrier for braking is sucked onto the sliding surface of the brake body of the brake device and thus the brake device only engages on one side of the record carrier.
- the other side of the record carrier e.g. the side of the record carrier on which the toner images are arranged is not affected by the braking device.
- the preheating saddle needs to be extended while the printing speed remains the same. With this extension of the preheating saddle, it is essential to ensure good heat transfer between the recording medium and the saddle sliding surface. Good heat transfer is only achieved if there is direct contact between the recording medium and the saddle sliding surface. At high printing speeds and when using pre-folded or unevenly thick recording media, the recording media may flutter in the area of the saddle. As a result, the recording medium partially lifts off the saddle, which worsens the heat transfer.
- Continuous paper printers in particular must be able to process an extremely wide range of recording media in paper form.
- the record carriers have e.g. a paper basis weight of 50 gr / qm to 160 gr / qm.
- Coated and uncoated papers, recycled papers, plastic-coated papers, long-fiber and short-fiber papers, etc. are processed.
- paper types with new properties come onto the market every year, which must be optimally processed by the printing or copying equipment without hardware changes.
- the material of the recording medium contains various components that are released when heated.
- the components released in the form of steam or gas are reflected in the printing or copying machine and cause faults there.
- water vapor is released, which can cause corrosion.
- the aim of the invention is to design a pneumatic brake device of the type mentioned at the outset in such a way that the pneumatic brake device enables record carriers with various parameters, such as width, thickness and nature, to be handled safely and reliably.
- Another aim is to design a pneumatic braking device for a recording medium in a printing or copying machine, which is assigned to a fixing device, so that it is possible to determine the effectiveness of the pneumatic braking device according to the operating parameters, e.g. Adjusting the fixing temperature, recording medium transport speed and the recording medium-specific parameters, such as width, thickness and nature, in such a way that a high fixing quality is achieved with reliable handling of the recording medium.
- the operating parameters e.g. Adjusting the fixing temperature, recording medium transport speed and the recording medium-specific parameters, such as width, thickness and nature
- At least one suction opening is arranged in the sliding surface. This suction opening affects at least the area of the sliding surface that comes into contact with the recording medium. Longitudinal or transverse slot-like depressions can therefore be provided in the sliding surface, which end in the suction opening. If several suction openings are provided, then one or more slit-shaped depressions can be assigned to one or more suction openings. If enough suction openings are provided that the entire area of the sliding surface mentioned can be influenced, then the slot-shaped depressions can be dispensed with entirely.
- the suction openings are coupled to the vacuum generating device. This coupling can be done by hoses, through channels or by directly flange-mounting the vacuum generating device at the suction openings.
- the air flow rate of the vacuum generating device can be controlled with means for adjusting the vacuum.
- a blower whose speed can be adjusted, a valve connected between the blower and intake openings, throttle valves and the like are suitable as means. These means can be adapted manually or automatically to the parameters of the recording medium.
- an arrangement for adjusting the negative pressure is provided. If this arrangement is of a manual type, it can consist, for example, of a lever which can be brought into different rotational positions, each of which is assigned to a special record carrier and its parameters.
- An automatic setting can be carried out, for example, by an electromagnetic or electromotive drive of the adjustment means, a control unit being provided for this drive, which controls the electromagnet or electric motor based on its supplied parameters of the recording medium in such a way that the desired negative pressure is established.
- the pneumatic brake device is assigned to a fixing device, then its sliding surface consists of a caliper sliding surface assigned to the preheating caliper and a brake sliding surface assigned to the brake body.
- the brake body is used to tighten the recording medium before the fixing process. Wrinkling and wrinkling of the record carrier are avoided.
- the preheating caliper following the brake body in the direction of the recording medium heats the recording medium so that an optimal fixing result can be achieved.
- the sliding surface in the area of the preheating saddle is radially shaped.
- This radial shape ensures a force component over the entire length of the saddle that presses the record carrier against the saddle sliding surface.
- This force component is additionally supported by the suction openings in the saddle sliding surface.
- the recording medium is influenced by the suction effect of the vacuum-producing device over its entire extension located above the saddle sliding surface via slot-shaped depressions or via a sufficient number of suction openings. This also creates good contact between the recording medium and the sliding surface. This good contact is achieved regardless of operating parameters such as printing speed, fusing temperature etc. and the parameters of the recording medium.
- the means for adjusting the negative pressure and the arrangement which detects the operating parameters and / or the parameters of the recording medium and which controls the means as a function of this result are significantly involved in this result. This is the only way to reliably carry out each print or copy job individually, even though different recording media are processed.
- valve as a means for adjusting the negative pressure, which is arranged between the negative pressure generating device and the one or more suction openings, is particularly advantageous. With the help of the valve it is possible to adjust the vacuum within a very short time or to decouple the vacuum generating device from the suction openings.
- the cross-sectional shape of the rotary piston has a cross section in its section located in the valve channel, which contains at least one flattening or depression.
- the cross section of the valve channel in the region of the rotary lobe is shaped such that when the rotary lobe rotates, the effective valve channel cross-sectional area of the valve channel in a first angular section is the shape of a rectangle on its narrow side, in a second angular section the shape of a trapezoid and in a third angular section Form of a rectangle standing on its broad side.
- the short side of the trapezoid is directly coupled to a narrow side of the first rectangle and the long side of the trapezoid is directly coupled to a broad side of the second rectangle.
- the cross-section of the valve channel and the rotary piston designed in this way achieves the linear dependence of the negative pressure on the angle of rotation.
- the valve channel has an environmental opening in the area of the rotary piston.
- a connection of the suction openings with the surroundings or with the vacuum generating device can be switched. This switching can be done in a very short time. This is particularly necessary if printing is interrupted or the direction of recording medium is changed.
- the arrangement for setting the negative pressure has a parameter acquisition unit, with the aid of which the data carrier-specific data can be acquired.
- This data acquisition can be done manually by key input, semi-automatically by a barcode reading pen or fully automatically by a barcode reading device which is arranged in the printing or copying machine in such a way that it can read a barcode applied to the recording medium or to a packaging of this recording medium.
- the arrangement for setting the negative pressure is also associated with a motor coupled to the rotary piston, position sensors arranged in a rotary piston environment, each assigned to a rotational position, and a control unit coupled with the components of the arrangement for setting the negative pressure.
- the control unit is able to control the motor in such a way that the rotary piston arrives in a rotary position associated with the detected parameters, which is between or at the rotary positions marked by the position sensors.
- a pressure sensor is provided between the valve and the suction openings and is coupled to the control unit. With the help of this pressure sensor, the control unit is able to detect the actual vacuum that has actually been reached and to compare it with the target vacuum that is assigned to the detected parameters. If an inequality is found, the control unit can control the motor accordingly so that the actual vacuum and the target vacuum are identical.
- the preheating saddle has several heating zones with increasing temperature in the direction of the recording medium. A uniform supply of energy to the record carrier is thus achieved, whereby the record carrier is loaded only slightly.
- the saddle sliding surface is convexly curved in the direction of the record carrier.
- On the side of the preheating saddle opposite the saddle sliding surface at least one vacuum channel is provided in the direction of the recording medium. A large number of suction openings open into this vacuum channel.
- the vacuum channel can be arranged on the saddle edge or in any possible intermediate position between the two edges. The number of vacuum channels is adapted to the required air delivery rate.
- the suction openings open into slot-shaped depressions in the saddle sliding surface which extend transversely to the recording medium running direction. This ensures that the record carrier is sucked onto the saddle surface not only selectively, but over a large area.
- the slot-shaped depressions can be straight or curved and can also run parallel to one another or have irregular distances from one another along their spread.
- the valve is directly coupled to the brake body, while the vacuum channels are indirectly coupled to the valve via the brake body.
- This arrangement allows conclusions to be drawn from the negative pressure prevailing in the brake body as to the negative pressure in the negative pressure channels. It is therefore sufficient to determine the target vacuum in the brake body with the aid of the pressure sensor in order to determine the actual vacuum both in the brake body and in the vacuum channels.
- an adaptation device provided in the brake body for adapting the effective width of the brake body to the actual width of the recording medium can additionally be used to open or close vacuum channels.
- the vacuum-generating device contains an air filter, which protects the printing or copying machine against contaminants which are sucked off from the recording media. With increasing pollution of the air filter, the air delivery capacity of the vacuum generating device decreases.
- the control unit increases the effective valve channel cross-sectional area in accordance with the decrease in delivery capacity. When the maximum cross-sectional area of the valve channel is reached, the control unit signals that the filter of the vacuum-generating device has to be cleaned or replaced.
- sucking the recording medium onto the saddle surface is, in addition to optimizing the heat transfer between the preheating saddle and the recording medium, suctioning off gases and vapors released when the recording medium is heated. Harmful influences these gases and vapors within the printing or copying machine are prevented.
- An electrographic printing or copying device for printing on recording media in the form of single sheet or continuous paper contains a fixing device.
- This fixing device is designed as a thermal pressure fixing device.
- the thermal pressure fixing device essentially contains a heating roller and a pressure roller (not shown) and a preheating saddle (20, 21).
- the heating roller is driven by an electric motor, so that between the pressure roller and the heating roller located record carrier is transported in the record carrier direction 9.
- the fixing device according to FIG. 1 is preceded by a brake body 10 in the direction 9 of the record carrier.
- the surface of the brake body 10 forms a brake sliding surface 23.2 and the surface of the preheating caliper consisting of a first preheating caliper 20 and a subsequent second preheating caliper 21 forms a caliper sliding surface 23.1.
- Caliper sliding surface 23.1 and brake sliding surface 23.2 form the sliding surface 23 over which the record carrier is drawn.
- the heated preheating saddle 20, 21 is radially shaped and is used to preheat the recording medium. In the preheated state, this is fed to the actual fixing gap between the pressure roller and the heating roller.
- the recording medium is guided taut over the preheating caliper 20, 21.
- a loose toner image on the recording medium is preheated on the preheating saddle 20, 21 and fixed on the recording medium by heat and pressure between the rollers.
- the two heated preheating saddles 20, 21 connected in series in the direction of the recording medium are pivotally connected to one another about a pivot point 22.
- the first preheating saddle 20 and the second preheating saddle 21 form two separate heating zones when viewed in the direction of recording medium 9.
- the entire preheating section has a length of approximately 500 to 700 mm.
- the recording medium slides with its toner-free side on the sliding surface 23.
- the saddle sliding surface 23.1 has a radius which in the example shown is 700 mm. Due to the curvature of the saddle sliding surface 23.1 in connection with the train through the rollers and braking A force component acts through the brake body 10 over the entire length of the saddle, which presses the recording medium against the saddle sliding surface 23.1.
- the saddle sliding surface 23.1 transversely to the recording medium running direction 9 has elongated, slot-like depressions 24, which run parallel to one another and extend approximately over the entire width of the preheating saddles 20, 21.
- the slot-shaped depressions 24 are connected by suction openings 19 designed as lateral bores to vacuum channels 11, 12 arranged on both sides below the preheating saddles 20, 21.
- the vacuum channels 11, 12 extend in the direction of the record carrier 9. Their end facing the fixing device is closed. The other end opens into the brake body 10.
- the brake body 10 is designed as a hollow body. Its side facing the recording medium forms, together with the preheating calipers 20, 21, the sliding surface 23. A large number of suction openings 18 in the form of bores are made from the brake sliding surface 23.2 in the cavity of the brake body 10.
- a valve 1 is flanged to the side of the brake body 10, as seen in the direction of recording medium 9.
- the valve 1 is connected to a blower 17 via a blower duct 16.
- the negative pressure generated by the fan 17 can be adapted to the existing operating parameters in the printing or copying machine.
- the operating parameters include data carrier-specific parameters such as width, thickness and nature, as well as fusing temperature, data carrier speed, stand-by mode, etc.
- the printing or copying device should be able to process a large number of recording media.
- the vacuum can be changed with the help of valve 1.
- a further adjustment possibility can be provided in order to improve adaptation to different recording medium widths.
- the suction openings 18, 19 further away from the valve 1 are no longer covered by the recording medium. This reduces the suction effect on the record carrier.
- US Pat. No. 4,173,301 shows how suction openings 18 which are not required can be closed by a slide or by perforated shutters.
- Such devices can also include the subject of the invention.
- flaps, slides or perforated diaphragms can be provided which, if necessary, close one of the two vacuum channels 11, 12 opening into the brake body 10 on the brake body side.
- the valve 1 serving as a means for adjusting the negative pressure is coupled to an arrangement which detects the operating parameters of the printing or copying device and / or parameters of the recording medium and controls the valve as a function thereof.
- the valve 1 is adjustable by means of a motor 6.
- the motor 6 is controlled according to FIG. 2 by a control unit 25.
- the control unit 25 has various inputs 28, 29, 34:
- a parameter acquisition unit 27 is coupled to a first input 28.
- the components of the parameter acquisition unit 27 are shown in the form of blocks in FIG.
- the parameter acquisition unit 27 is used to acquire the parameters of the record carrier.
- the parameter acquisition unit 27 can be expanded as desired, so that it can also be used for the acquisition and selection of operating parameters, such as, for example, fixing energy, printing speed, printing operation in general, stand-by operation, etc.
- the recording medium-specific characteristic data such as paper basis weight, paper type or other data characterizing the structure of the recording medium, can be recorded in order to be able to derive control setpoints for the negative pressure.
- the control unit 25 is connected to an additional input arrangement 38 via a second input 29.
- the additional input arrangement 38 can be implemented in the form of a personal computer PC. With the aid of the additional input device 38, algorithms or tables for determining the desired vacuum can be created or changed and then stored in a memory M contained in the control unit 25. This is always necessary if no associated target vacuum is known or can be calculated for a paper basis weight, or if a known target vacuum turns out to be defective.
- a pressure sensor 26 and two position sensors 13, 14 are coupled to the control unit 25 via a third input 34. These sensors provide the control unit 25 with information about the rotational position of the rotary piston 3 and the negative pressure prevailing.
- control unit 25 contains a microprocessor ⁇ P which evaluates the information supplied by the parameter acquisition unit 27 and the sensors 13, 14, 26 and controls the motor 6 based on this information.
- the control unit has a power block 40 for controlling the motor 6.
- the power block 40 can be, for example, a D / A converter, the output driver of which is designed in such a way that it supplies enough power to control the motor 6.
- the sensors 13, 14, 26 deliver their information via the third input 34 to a converter block 39 contained in the control unit.
- the converter block 39 is equipped, for example, by an A / D converter with input driver stages adapted to the sensors.
- the converter block 39 converts the analog sensor information into digital information that can be processed by the microprocessor ⁇ P.
- the control unit 25 also contains the memory M.
- the microprocessor ⁇ P is connected directly to the memory M. Tables or algorithms are stored in the memory M, with the aid of which the microprocessor ⁇ P determines the desired vacuum from the data supplied by the parameter acquisition unit 27, namely the paper basis weight.
- the microprocessor ⁇ P uses the algorithms to calculate the target vacuum. With the help of the tables, the microprocessor ⁇ P reads out the desired negative pressure assigned to the paper basis weight from individual memory cells in the tables. The desired negative pressure is stored in a memory cell and compared with an actual negative pressure supplied by the pressure sensor 26 (see FIG. 1).
- a deviation of the actual negative pressure from the target negative pressure results due to a disturbance variable 15.
- the disturbance variable 15 symbolizes, for example, influences that result from deviations from the paper width, the paper surface quality or a varying printing speed.
- the pressure sensor 26 is connected to the brake body via a hose 30 10 connected. By using the hose 30, it becomes possible to arrange the pressure sensor 26 anywhere within the printing or copying machine.
- FIG. 3 shows a view of the valve 1 on the side connected to the brake body 10.
- Figures 4.1 to 4.3 each show a sectional view along the marked line.
- the valve 1 consists essentially of a valve channel 2, one end of which is connected to the fan 17 via the fan channel 16 and the other end of which is flanged to the brake body 10.
- the cross section of this valve channel 2 determines the negative pressure that can be generated at the constant fan power on the sliding surface 23. By changing this cross-section, the vacuum can be changed accordingly.
- the valve channel 2 is penetrated transversely by a rotary piston 3.
- This is circular-cylindrical and is rotatably supported at both ends in the housing of the valve 1 about its axis.
- the part of the rotary piston 3 located in the valve channel 2 has a flattening and depression 4 of the piston cross section. If this flattening and recess 4 were missing, the rotary piston 3 would seal the valve channel 2 airtight.
- the rotary piston 3 closes a further valve opening.
- the valve 1 has a surrounding opening 8, which starts from the valve channel 2 and leads to the outside. Through the recess and flattening 4 in the rotary piston 3, the surrounding opening 8 can be opened to the valve channel 2 when the rotary piston 3 rotates.
- FIGS. 4.1 to 4.3 now show different rotary positions of the rotary piston 3.
- the vacuum channels of the preheating calipers 20, 21 and the brake body 10 are connected to the ambient air via the ambient opening 8.
- This position is used for the functional reliability of the printing or copying machine when certain operating parameters are present. For example, in one Operating state in which a return transport of the recording medium against the actual recording medium running direction 9 is required, the negative pressure is switched off within a few milliseconds. This can be done by turning the rotary piston 3 to position 1.
- the position of the position 1 of the rotary piston 3 also assumes when the printing or copying machine enters a paper mode or a paper positioning mode.
- FIG. 4.2 A second rotational position of the rotary piston 3 is shown in FIG. 4.2. In this rotational position, all openings of the valve 1 are decoupled from one another. The rotary piston 3 seals the valve channel 2 both to the vacuum channels 20, 21, to the surrounding opening 8 and to the blower 17. This second position illustrates how the size and dimension of the flattening and depression in the rotary piston 3 is to be dimensioned. A suction of air from the surrounding opening 8 is thus effectively prevented.
- a third rotational position of the rotary piston 3 is shown in FIG. 4.3.
- the effective cross-section of the valve channel is greatest in this third rotational position.
- the effective cross-sectional area of the valve channel 2 increases in all further rotary positions of the rotary piston 3 lying between the second rotary position and the third rotary position.
- the rotary piston 3 is adjusted by a motor 6, which is connected to the rotary piston 3 via a clutch 5.
- a rotation of the motor 6 causes a rotation of the rotary piston 3.
- the effective cross-sectional area of the valve channel 2 changes. This effective cross-sectional area can have different basic shapes.
- a rectangular first cross section 31 see FIG. 5
- These Dependency is shown in Figure 5. This non-linearity makes the setting of the negative pressure and the activation of the motor 6 imprecise and difficult.
- a second valve channel cross section 32 which is formed in a first angular section by a rectangle standing on its narrow side, in a second angular section by a trapezoid and in a third angular section by the rectangle standing on its broad side.
- the effective valve channel cross-sectional area increases continuously 32 slightly in the first angular section.
- the valve channel cross-sectional area continuously changes to the third angular section with a constantly large valve channel cross-sectional area increase.
- the negative pressure can thereby be changed almost linearly with the angle of rotation of the rotary piston 3. This enables uniform, good metering of the negative pressure and simplified control of the motor 6.
- a magnet 7 is fastened to the rotary piston 3 in the vicinity of the circumference.
- Two position sensors 13, 14 are arranged opposite this end of the rotary piston 3.
- the magnet 7 and a first position sensor overlap at position 1 of the rotary piston 3.
- a second position sensor 14 and the magnet 7 overlap at position 3 of the rotary piston 3.
- the position sensors 13, 14 are connected to the converter block 39 via the third input 34 Control unit 25 connected.
- control unit 25 controls certain basic positions before the printing or copying operation. There are operating states in which regulation of the negative pressure is not possible. In the stand-by mode, the negative pressure must be reduced, since otherwise the paper web bulges and the negative pressure collapses due to the leakage air. Therefore, the control unit 25 stores the last control position by measuring the time until the Rotary piston 3 has moved from the last control position to the first position and then moves the same time in the other direction at the next start of printing and remains in this last control position assumed again, initially without control. The control is started again during continuous operation.
- the available control time is too short in start-stop operation. By the time a constant pressure has built up, the device may already switch back to stop mode. Therefore, the rotary piston 3 is also always controlled in this operating mode into a position which in turn is defined by a specific switch-on time of the motor 6. The regulation takes place only after approx. 2 sec. Printing.
- the second sensor 14 for the third rotational position of the rotary piston 3 is used to monitor a dust filter 33.
- the dust filter 33 is located on the blown side of the blower 17 and prevents sucked-in paper dust from getting into the environment. The fuller the filter 33, the further the effective valve channel cross-sectional area must be increased in order to achieve the required pressure. If the rotary piston 3 moves to the third position, a filter change is requested by means of a display on the printing or copying machine.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fixing For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
Abstract
Claims (11)
- Système de frein pneumatique pour un support d'enregistrements dans un appareil imprimeur ou copieur électrographique, comprenant- un corps de frein (10) qui est pourvu d'une surface de glissement du frein (23.2) recevant le support d'enregistrements et présentant au moins un orifice d'aspiration (18),- une selle de guidage (20, 21) d'un dispositif de fixage qui suit le corps de frein (10) dans la direction (9) de marche du support d'enregistrements et dont la surface de glissement de selle (23.1) recevant le support d'enregistrements est pourvue d'au moins un orifice d'aspiration (19),- un dispositif générateur de vide, couplé aux orifices d'aspiration (18, 19), et- une soupape (1) exécutée de manière réglable, qui est située entre le dispositif générateur de vide et le ou les orifice/s d'aspiration (18, 19), la soupape contenant un canal de soupape (2) et un piston rotatif (3) situé dans le canal de soupape (2), lequel piston, lors d'une rotation, influe sur l'aire de la section effective (31, 32) du canal de soupape (2), le piston rotatif (3) de la soupape (1) ayant une section transversale dont la forme est déterminée de manière à ce que, lors d'une rotation du piston rotatif (3), la dépression se modifie de manière à peu prés linéaire par rapport à l'angle de rotation.
- Dispositif selon la revendication 1, comprenant un arrangement couplé à la soupape (1), qui saisit des paramètres de fonctionnement de l'appareil imprimeur ou copieur et/ou des paramètres du support d'enregistrements, et commande la soupape (1) en fonction de ces paramètres.
- Dispositif selon l'une des revendications 1 ou 2, dans lequel la section du piston rotatif (3) se trouvant dans le canal de soupape présente au moins un aplatissement et/ou un évidement, et la section du canal de soupape (2) dans la zone du piston rotatif (3) est formée de manière à ce que, lors de la rotation du piston rotatif (3), l'aire de la section effective (32) du canal de soupape (2) ait- dans un premier segment angulaire, la forme d'un rectangle debout sur son petit côté,- dans un deuxième segment angulaire, la forme d'un trapèze, et- dans un troisième segment angulaire, la forme d'un rectangle posé sur son grand côté.
- Dispositif selon l'une des revendications précédentes, dans lequel- le canal de soupape (2) est pourvu, dans la zone du piston rotatif (3), d'une ouverture (8) pour l'environnement,- le piston rotatif (3) peut passer, par rotation, d'une première position de rotation, dans laquelle le canal de soupape (2) est ouvert uniquement en direction de l'environnement et des orifices d'aspiration (18, 19), dans une troisième position de rotation, dans laquelle le canal de soupape (2) est fermé vis-à-vis de l'environnement et est ouvert des orifices d'aspiration (18, 19) au dispositif générateur de vide, la section effective (32) du canal de soupape ayant son aire maximale.
- Dispositif selon l'une des revendications précédentes 2 à 4, dans lequel l'arrangement pour le réglage de la dépression comprend :- une unité de saisie de paramètres (27),- un moteur (6) couplé au piston rotatif (3),- des capteurs de position (13, 14) situés aux alentours du piston rotatif et associés chacun à une position de rotation respective, et- une unité de commande (25) couplée aux composants de l'arrangement pour le réglage de la dépression, laquelle unité (25) commande le moteur (6) en fonction de la dépression de consigne, de manière à ce que s'installe une aire de section effective (32) du canal de soupape nécessaire pour la dépression de consigne.
- Dispositif selon la revendication 5, dans lequel est prévu un capteur de pression (26) détectant la dépression entre la soupape (1) et les orifices d'aspiration (18, 19), lequel capteur (26) est couplé à l'unité de commande (25).
- Dispositif selon l'une des revendications précédentes, dans lequel- la selle de préchauffage (20, 21) présente plusieurs zones de chauffage dont la température augmente dans la direction (9) de marche du support d'enregistrements,- la surface de glissement de la selle (23.1) est courbée de manière convexe dans la direction (9) de marche du support d'enregistrements,- le côté de la selle de préchauffage (20, 21) opposé à la surface de glissement de la selle (23.1) est pourvu d'au moins un canal à vide (11, 12) dans la direction (9) de marche du support d'enregistrements, canal (11, 12) dans lequel débouchent une pluralité d'orifices d'aspiration (18, 19).
- Dispositif selon la revendication 7, dans lequel les orifices d'aspiration débouchent dans des creux (24) en forme de fentes s'étendant perpendiculairement à la direction (9) de marche du support d'enregistrements, dans la surface de glissement de la selle (23.2).
- Dispositif selon l'une des revendications 7 ou 8, dans lequel la soupape (1) est couplée directement au corps de frein (10) et le/les canal/canaux à vide (11, 12) est/sont couplé/s indirectement à la soupape (1) par l'intermédiaire du corps de frein (10).
- Dispositif selon la revendication 9, dans lequel le corps de frein (10) contient un dispositif d'adaptation pour l'adaptation de sa largeur efficace à la largeur effective du support d'enregistrements, et au moins un canal à vide (11, 12) peut être fermé à l'aide de ce dispositif d'adaptation.
- Dispositif selon l'une des revendications précédentes, dans lequel le dispositif générateur de vide contient un filtre à air (33).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4235705 | 1992-10-22 | ||
DE4235705 | 1992-10-22 | ||
PCT/DE1993/000632 WO1994009408A1 (fr) | 1992-10-22 | 1993-07-16 | Systeme de frein pneumatique pour un support d'enregistrement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0665962A1 EP0665962A1 (fr) | 1995-08-09 |
EP0665962B1 true EP0665962B1 (fr) | 1996-05-08 |
Family
ID=6471112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93914634A Expired - Lifetime EP0665962B1 (fr) | 1992-10-22 | 1993-07-16 | Systeme de frein pneumatique pour un support d'enregistrement |
Country Status (5)
Country | Link |
---|---|
US (1) | US5627633A (fr) |
EP (1) | EP0665962B1 (fr) |
JP (1) | JPH07509076A (fr) |
DE (1) | DE59302531D1 (fr) |
WO (1) | WO1994009408A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6055408A (en) * | 1995-03-24 | 2000-04-25 | Oce Printing Systems Gmbh | Device for the positionally exact synchronization of the parallel course of recording medium webs in an electrographic printer device |
DE59610097D1 (de) * | 1995-10-27 | 2003-03-06 | Oce Printing Systems Gmbh | Einrichtung zum regeln des drucks in einer druckkammer |
WO1999028800A1 (fr) * | 1997-11-27 | 1999-06-10 | Solar & Robotics | Ameliorations a des robots mobiles et a leur systeme de commande |
US6532404B2 (en) | 1997-11-27 | 2003-03-11 | Colens Andre | Mobile robots and their control system |
US6367999B1 (en) * | 1999-02-15 | 2002-04-09 | Hewlett-Packard Company | Hardcopy apparatus and method for providing uniform pressure to hold down media |
DE50110999D1 (de) | 2000-12-22 | 2006-10-26 | Eastman Kodak Co | Digitale Druck- oder Kopiermaschine |
JP2012020857A (ja) * | 2010-07-16 | 2012-02-02 | Komori Corp | エア圧力制御装置 |
CN117566511B (zh) * | 2024-01-15 | 2024-03-19 | 江苏创新包装科技有限公司 | 一种包装纸板自动转运码垛装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1728329A (en) * | 1927-09-21 | 1929-09-17 | Hickok W O Mfg Co | Conveyer and guide |
US2911008A (en) * | 1956-04-09 | 1959-11-03 | Manning Maxwell & Moore Inc | Fluid flow control device |
DE2706362C3 (de) * | 1977-02-15 | 1979-09-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Wärmeschmelzfixiereinrichtung |
DE2707170C2 (de) * | 1977-02-18 | 1982-07-15 | Siemens AG, 1000 Berlin und 8000 München | Pneumatische Bremse für einen Aufzeichnungsträger |
JPS6023054B2 (ja) * | 1977-04-15 | 1985-06-05 | キヤノン株式会社 | 連続紙の搬送装置 |
JPS5830778A (ja) * | 1981-08-17 | 1983-02-23 | Fujitsu Ltd | フイルタの目づまり検出方式 |
JPS5898916A (ja) * | 1981-12-09 | 1983-06-13 | Hitachi Ltd | 半導体製造装置 |
JPS63292177A (ja) * | 1987-05-25 | 1988-11-29 | Nec Corp | 熱ロ−ラ−定着装置 |
JPH0228677A (ja) * | 1988-03-18 | 1990-01-30 | Hitachi Koki Co Ltd | レーザプリンタの定着装置 |
US4835573A (en) * | 1988-04-29 | 1989-05-30 | International Business Machines Corporation | Machine control system utilizing paper parameter measurements |
DE3931995A1 (de) * | 1989-09-26 | 1991-04-04 | Heidelberger Druckmasch Ag | Vorrichtung zur luftsteuerung von anlegerblas- und anlegersaugluft bei bogenanlegern von druckmaschinen |
-
1993
- 1993-07-16 US US08/424,429 patent/US5627633A/en not_active Expired - Lifetime
- 1993-07-16 DE DE59302531T patent/DE59302531D1/de not_active Expired - Fee Related
- 1993-07-16 JP JP6509490A patent/JPH07509076A/ja active Pending
- 1993-07-16 EP EP93914634A patent/EP0665962B1/fr not_active Expired - Lifetime
- 1993-07-16 WO PCT/DE1993/000632 patent/WO1994009408A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP0665962A1 (fr) | 1995-08-09 |
JPH07509076A (ja) | 1995-10-05 |
US5627633A (en) | 1997-05-06 |
WO1994009408A1 (fr) | 1994-04-28 |
DE59302531D1 (de) | 1996-06-13 |
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