EP0665962A1 - Systeme de frein pneumatique pour un support d'enregistrement. - Google Patents

Systeme de frein pneumatique pour un support d'enregistrement.

Info

Publication number
EP0665962A1
EP0665962A1 EP93914634A EP93914634A EP0665962A1 EP 0665962 A1 EP0665962 A1 EP 0665962A1 EP 93914634 A EP93914634 A EP 93914634A EP 93914634 A EP93914634 A EP 93914634A EP 0665962 A1 EP0665962 A1 EP 0665962A1
Authority
EP
European Patent Office
Prior art keywords
recording medium
rotary piston
valve
vacuum
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.)
Granted
Application number
EP93914634A
Other languages
German (de)
English (en)
Other versions
EP0665962B1 (fr
Inventor
Joachim Hoffmann
Edmund Creutzmann
Walter Kopp
Helmut Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Wincor Nixdorf International GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Publication of EP0665962A1 publication Critical patent/EP0665962A1/fr
Application granted granted Critical
Publication of EP0665962B1 publication Critical patent/EP0665962B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • 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 record carriers 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 record carrier.
  • 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 one in front of the rollers - arranged preheating device, e.g. a heatable saddle.
  • preheating device e.g. a heatable saddle.
  • 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 only acts on the brake device on one side of the recording medium.
  • the other side of the recording medium for example the side of the recording medium on which the toner images are arranged, is not affected by the braking device.
  • a measure is known from US Pat. No. 4,173,301 for adapting the suction width of the sliding surface to a parameter, namely the width of the recording medium.
  • certain suction openings in the sliding surface are closed according to the width of the recording medium, while the suction openings located in the area of the recording medium remain open.
  • This measure ensures that the fixed value of the negative pressure, which is generated with the aid of the negative pressure generating device, can be maintained with different recording medium widths. Further measures relating to negative pressure are not provided.
  • the preheating device needs to be extended. 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 non-uniformly 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 paper recording media.
  • the record carriers have e.g. a paper surface weight of 50 gr / sqm to 160 gr / sqm.
  • 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 have to be processed optimally by the printing or copying devices without hardware changes.
  • the material of the recording medium contains various components that are released when heated.
  • the constituents released in the form of steam or gas precipitate in the printing or copying machine and cause faults there.
  • heating paper for example, water vapor is released. May cause corrosion.
  • the aim of the invention is to design a pneumatic braking device of the type mentioned at the outset in such a way that the pneumatic braking device enables record carriers with a wide variety of parameters, such as width, thickness and condition, to be treated safely and reliably.
  • Another aim is to design a pneumatic brake device for a record carrier assigned to a fixing device in a printing or copying machine in such a way that it is possible to determine the effectiveness of the pneumatic brake device according to the operating parameters, e.g. To adjust the fixation 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 treatment of the recording medium.
  • the operating parameters e.g.
  • At least one suction opening is arranged in the sliding surface.
  • This suction opening has an effect at least on the area of the sliding surface which 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 blower and suction 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 take place, for example, by means of 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 the parameters of the record carrier supplied to it so that it is actuated sets the desired vacuum.
  • the pneumatic braking device is assigned to a fixing device, then its sliding surface consists of a caliper sliding surface assigned to the preheating caliper and a braking 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 recording medium 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 saddle length 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 the printing speed, fixing 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 actuate the means as a function thereof are significantly involved in this result. This is the only way to reliably carry out each print or copy job individually, although different recording media are processed.
  • valve as a means for adjusting the negative pressure, which is arranged between the device which generates the negative pressure and the suction opening or openings.
  • 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 design of the valve with a valve channel and a rotary piston arranged in the valve channel, which influences an effective valve channel cross-sectional area of the valve channel during rotation, the rotary piston having a cross-sectional shape which is determined in such a way that the negative pressure develops when the rotary piston rotates changes approximately linearly to the angle of rotation, making the valve particularly easy to regulate.
  • 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 piston is shaped such that when the rotary piston rotates, the effective valve channel cross-sectional area of the valve channel is in a first angular section the shape of a rectangle standing on its narrow side, in a second angular section the shape of a trapezoid and in a third angular section has the shape 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 linear dependence of the negative pressure on the angle of rotation is achieved by the cross section of the valve channel and the rotary piston designed in this way.
  • the valve channel has a surrounding opening in the area of the rotary piston.
  • 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 reads a barcode applied to the recording medium or to a packaging of this recording medium can.
  • 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 reaches 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 underpressure actually reached and to compare it with the So11 underpressure 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 recording medium is thus achieved, as a result of which the recording medium is loaded only slightly.
  • the saddle sliding surface is convexly curved in the direction of the recording medium.
  • At least one vacuum channel in the recording medium running direction is provided on the side of the preheating saddle opposite the saddle sliding surface. 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 direction of the recording medium. This ensures that the opening drawing carrier is not only sucked onto the saddle surface, but over a large area.
  • the slot-like 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 by the recording media. With increasing pollution of the air filter, the air delivery 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 valve channel cross-sectional area is reached, the control unit initiates a signal that the filter of the vacuum-generating device must be cleaned or replaced.
  • a further essential aspect of the suction of the recording medium on the saddle surface is the suctioning off of gases and vapors released when the recording medium is heated. Harmful input Flows of these gases and vapors within the pressure or copier are prevented.
  • FIG. 1 shows a schematic illustration of a pneumatic braking device, consisting of a preheating caliper with suction openings assigned to a fixing device, to which a braking body is arranged in front,
  • FIG. 2 shows a block diagram of an arrangement for setting the negative pressure in a pneumatic brake device according to FIG. 1,
  • FIG. 3 shows a view of the side of a valve assigned to the pneumatic braking device that can be connected to the suction openings
  • Figure 4.1 to 4.3 is a sectional view of the valve cut along the section line shown in Figure 3 with different rotational positions of a rotary piston arranged in the valve and
  • Figure 5 shows two vacuum / angle of rotation characteristic curves, which are set with different effective valve channel cross-sectional areas.
  • An electrographic printer or copier for printing on recording media in the form of a 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.
  • a brake body 10 is arranged in front of the fixing device according to FIG. 1 in the direction of recording medium 9.
  • 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.
  • Saddle 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 serves 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. Braked by the brake body 10 and driven by the rollers, the recording medium is guided tightly over the preheating caliper 20, 21.
  • a loose toner image located 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 9 of the recording medium.
  • the entire preheating section has a length of approximately 500 to 700 mm. During preheating, 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 direction of recording medium 9 has elongated, slot-shaped 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 recording medium 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. From the brake sliding surface 23.2 into the cavity of the brake body 10, a plurality of suction openings 18 are made in the form of bores.
  • a valve 1 is flanged to the side of the brake body 10, seen in the direction of the recording medium 9.
  • the valve 1 is connected via a blower duct 16 to a blower 17.
  • 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 recording medium-specific parameters such as width, thickness and nature, as well as fixing temperature, recording medium speed, stand-by operation, 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 covers 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 machine and / or parameters of the recording medium and which 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 serves to acquire the parameters of the recording medium.
  • the parameter acquisition unit 27 can, however, 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 which characterize the structure of the recording medium, can be recorded in order to be able to derive control setpoints for the negative pressure therefrom.
  • a keyboard 35 can be assigned to the parameter acquisition unit 27, by means of which the paper basis weight is entered alphanumerically.
  • the paper basis weight is usually printed on the recording medium packaging.
  • a code reading pen 36 can be assigned to the parameter detection unit 27, via which an operator detects a bar code printed on the packaging of the recording medium and in this way inputs the required information.
  • the parameter detection unit 27 can therefore be connected to a thickness measuring device 37 with which it is possible to detect the paper thickness. This device can consist, for example, of a measuring device which detects the paper thickness optically, mechanically or capacitively. Such measuring devices for detecting the material thickness are known in measuring technology.
  • It can consist, for example, of two sensing elements, between which the paper is arranged, with a thickness-dependent path change of the measuring section being detected inductively, capacitively or via strain gauges.
  • a device which detects the paper thickness, can be provided in the paper inlet area of the printing device.
  • 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 So11 underpressure is known or can be calculated for a paper basis weight, or if a known target underpressure 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 outputs the information supplied by the parameter acquisition unit 27 and the sensors 13, 14, 26 evaluates and controls the motor 6 as a function of 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 delivers 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 target negative pressure from the data supplied by the parameter acquisition unit 27, namely the paper basis weight. Using the algorithms, the microprocessor ⁇ P calculates the So11 vacuum. With the aid of the tables, the microprocessor ⁇ P reads out the desired underpressure associated with the weight of the paper surface from individual memory cells in the tables. The desired underpressure is stored in a memory cell and is supplied with an actual pressure sensor 26 (see FIG. 1) - Compare negative pressure.
  • a deviation of the actual negative pressure from the target negative pressure results due to a disturbance variable 15.
  • the disturbance variable 15 for example, symbolizes influences which result from deviations from the paper width, the paper surface condition 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 at any point within the printing or copying device.
  • 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 essentially consists 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 on the sliding surface 23 with constant fan power. By changing this cross-section, the suppression can be changed accordingly.
  • the valve channel 2 is penetrated transversely by a rotary piston 3.
  • This is circular-cylindrical and is mounted on both ends in the housing of the valve 1 so as to be rotatable 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 leads 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 serves to ensure 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 rotary piston 3 also assumes the position 1 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 are 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 the further rotary positions of the rotary piston 3 which lie 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
  • This Dependency is shown in Figure 5. This non-linearity makes the setting of the vacuum and the control 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 increase in valve channel cross-sectional area.
  • the negative pressure can thereby be changed almost linearly to the angle of rotation of the rotary piston 3. This enables uniform, good metering of the negative pressure and simple 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 also connected to the converter block via the third input 34 39 of the control unit 25 connected.
  • control unit 25 controls certain basic positions before printing or copying. There are operating states in which regulation of the negative pressure is not possible. In stand-by mode should the vacuum be reduced because anson ⁇ most the web to bulge and the negative pressure by the Leck ⁇ air collapses .. 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 into 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, 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 certain switch-on time of the motor 6. The regulation takes place only after approx. 2 see. 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 paper dust that has been sucked in 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 into the third position, then a filter change is requested by an indicator on the printing or copying machine.
  • PC personal computer
  • ⁇ P microprocessor

Landscapes

  • 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

Une imprimante ou une photocopieuse électrographique comprend par exemple une semelle de préchauffage (20, 21) logée en amont d'une paire de cylindres de fixage dans le sens de la marche du support d'enregistrement et un corps de freinage (10). La semelle de préchauffage (20, 21) et le corps de freinage (10) forment une surface de glissement (23). Des orifices d'aspiration (18, 19) accouplés à un dispositif générant une dépression permettent qu'il y ait un bon contact entre la surface de glissement (23) et le support d'enregistrement. Une soupape (1) permet d'adapter la dépression aux paramètres de fonctionnement de l'imprimante et de la photocopieuse, ainsi qu'aux paramètres du support d'enregistrement.
EP93914634A 1992-10-22 1993-07-16 Systeme de frein pneumatique pour un support d'enregistrement Expired - Lifetime EP0665962B1 (fr)

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 true EP0665962A1 (fr) 1995-08-09
EP0665962B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6389329B1 (en) * 1997-11-27 2002-05-14 Andre Colens Mobile robots and their control system
US6532404B2 (en) 1997-11-27 2003-03-11 Colens Andre Mobile robots and their control system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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
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

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JPS53128340A (en) * 1977-04-15 1978-11-09 Canon Inc Conveyor for continuous paper
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
JPH0228677A (ja) * 1988-03-18 1990-01-30 Hitachi Koki Co Ltd レーザプリンタの定着装置

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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
JPS63292177A (ja) * 1987-05-25 1988-11-29 Nec Corp 熱ロ−ラ−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

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JPS53128340A (en) * 1977-04-15 1978-11-09 Canon Inc Conveyor for continuous paper
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
JPH0228677A (ja) * 1988-03-18 1990-01-30 Hitachi Koki Co Ltd レーザプリンタの定着装置

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Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 179 (P-1034) 10. April 1990 ; & JP-A-02 028 677 *
PATENT ABSTRACTS OF JAPAN vol. 3, no. 1 (E-082) 11. Januar 1979 ; & JP-A-53 128 340 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 109 (P-196)(1254) 12. Mai 1983 ; & JP-A-58 030 778 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 200 (E-196) 3. September 1983 ; & JP-A-58 098 916 *
See also references of WO9409408A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6389329B1 (en) * 1997-11-27 2002-05-14 Andre Colens Mobile robots and their control system
US6532404B2 (en) 1997-11-27 2003-03-11 Colens Andre Mobile robots and their control system

Also Published As

Publication number Publication date
US5627633A (en) 1997-05-06
DE59302531D1 (de) 1996-06-13
EP0665962B1 (fr) 1996-05-08
WO1994009408A1 (fr) 1994-04-28
JPH07509076A (ja) 1995-10-05

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