EP0840908A1 - Vorrichtung zum transport von mit randlochungen versehenen aufzeichnungsträgern - Google Patents
Vorrichtung zum transport von mit randlochungen versehenen aufzeichnungsträgernInfo
- Publication number
- EP0840908A1 EP0840908A1 EP96918597A EP96918597A EP0840908A1 EP 0840908 A1 EP0840908 A1 EP 0840908A1 EP 96918597 A EP96918597 A EP 96918597A EP 96918597 A EP96918597 A EP 96918597A EP 0840908 A1 EP0840908 A1 EP 0840908A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transport
- recording medium
- base body
- tooth
- driving pins
- 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
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
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/26—Pin feeds
- B41J11/30—Pin traction elements other than wheels, e.g. pins on endless bands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/20—Advancing webs by web-penetrating means, e.g. pins
-
- 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
- G03G2215/00443—Copy medium
- G03G2215/00451—Paper
- G03G2215/00455—Continuous web, i.e. roll
- G03G2215/00459—Fan fold, e.g. CFF, normally perforated
Definitions
- tractor drive To transport edge-perforated recording media in the area of the transfer printing station of electrographic printing devices, it is common to use a so-called tractor drive.
- a tractor drive is known for example from DE-C2-3307583.
- the known tractor drive contains a toothed belt which runs over a drive pulley and a deflection pulley.
- Driving pins are mounted on the side of the toothed belt via brackets, which engage in the perforations in the margins of the recording medium in order to transport the tape-shaped recording medium.
- Tractor drives of this type are used in electrographic endless printers to guide the paper web tangentially via a transfer saddle past a photoconductor drum in order to transfer toner images from the photoconductor to the paper web in the transfer printing area.
- the paper web lies tightly against the photoconductor drum at the transfer location.
- the paper web is transported by means of feed tracks arranged before and after the transfer printing saddle.
- Continuous papers for electrographic continuous printers are provided in the edge areas with transport holes into which entraining pins (transport pins) engage in order to transport the paper web in a form-fitting manner.
- the paper web is placed incorrectly in the transfer printing zone on the photoconductor.
- the position of the paper does not match the position of the printed image on the photoconductor, the printed image is transferred onto the paper with a shift in position.
- This positional inaccuracy in the paper running direction of the toner image on the paper is also referred to as line-level error.
- the transfer accuracy of the toner image to the paper is subject to ever increasing demands, for example to obtain a clean cover of several printed images on top of each other (full color printing).
- the exact arrangement of the driving pins on the transport belt is achieved by making their position dependent on the tooth pitch of the transport belt.
- a toothed belt with an extremely small pitch error from tooth to tooth or from tooth gap to tooth gap is used with an accuracy that is only a fraction of the required line-level accuracy.
- a single pinklammer carrying a driving pin can consist of two parts. One part is the Pinklammer base body on which the transport pin sits and is cast into the base body. The second part is the Pinklammer clamping web. The Pinklammer clamping web is placed in the tooth space of the belt and the Pinklammer base body is placed on the Pinklammer clip locked. The two legs of the clamping web, which are designed as hooks, snap positively into the corresponding counterpart of the base body with a prestress. The centering of the pitch is achieved by the position of the clamping web in the tooth space of the belt.
- the edges of the clamping web facing the tooth flanks of the belt have a slope which corresponds to the tooth flank shape of the belt.
- the clamping web is thus centered in the toothed belt gap due to its pretension.
- the clamping bar Since the clamping bar is slightly bent by the pretension, it is advantageous to have the clamping bar centered in the tooth gap only in a line with a maximum base.
- the linear support is achieved by the support nipple provided on the clamping web. If this linear support were not provided, an undefined position of the clamping web in the tooth gap and thus an incorrect division of the transport pins would result.
- the driving pins (pins) made of metal are cast into the basic clamp body by means of an injection molding tool.
- This injection molding tool cannot be manufactured with an arbitrarily exact tolerance. This means that the metal pins cannot be cast in the center of the Pinklammer base body exactly in the X and Y planes.
- the clip base has a recess on one side and a mounting lug on the other side.
- the clamp base body can therefore only be mounted in the correct position on the transport belt.
- the centering nose of one clip only fits into the recess of the adjacent clip. This avoids division errors of the transport pins, which are caused by tolerances of the injection molding tool.
- bracket recess Another advantage 'of the bracket recess is the following:
- the Pink lambs have to one another as possible are close not to let an elasticity of the clamp come into effect in the belt tooth gap.
- the paper web can migrate upward against the feed caterpillar cover on these guide surfaces and thus generate position errors of the paper transport perforations relative to the transport pins. This results in positioning errors of the toner image on the paper web during transfer printing.
- a conical embodiment of the pin guide surfaces provides a remedy.
- the guide surfaces must be so conical that the transport force of the paper web creates a force component which acts against the paper guide plates.
- the paper web cannot move upwards against the feed caterpillar cover. A positionally accurate paper web during transport and a more stable paper run are thus achieved.
- this bracket construction is of considerable advantage.
- ⁇ o two paper webs running side by side can be operated minimally close to each other.
- this clamp construction it is favorable to lift the paper web out of or into the transport perforations before the pins are dipped or immersed, so that the transport perforations are not torn out.
- the paper web can be raised by the corresponding shape of the paper guide plate.
- the conical guide surface shape of the transport pin also prevents this disruptive effect just described.
- the driving pins are arranged in brackets which lie next to the belts. Since the paper web has a resistance to the direction of transport, the pin clips are inclined at this torque load. As a result, the paper web, the position of which is determined by the transport pins, deviates from the required target position. The toner image is then transferred to the paper web with a shift in position in the transfer printing area. Line errors are the result.
- the clips according to the invention are designed so that they lie centrally on the outer peripheral surfaces of the belts. A tilting moment cannot occur. Since the brackets cannot be inclined, the position of the transport pins is independent of fluctuations in the transport load of the paper web.
- the individual clamp Due to the inclination of the known transport clamps already described, the individual clamp is so heavily loaded in the event of a paper jam by the torque which acts as a bending moment on the clamp body that the clamp can break.
- the clip according to the invention has arranged the transport pin in such a way that it lies centrally on the transport belt. The transmission of force from the transport pin to the transport belt thus takes place without a lever arm. As a result, no bending moment is transferred to the bracket. There is therefore no longer any danger of destroying the transport clips in the event of a paper jam.
- FIG. 1 shows a schematic illustration of an electrographic printing device with two recording medium webs with a tractor drive arranged next to one another in the area of the transfer printing station at a close distance.
- FIG. 2 shows a schematic representation of a known tractor drive with driving pins guided next to the belt.
- Figure 3 is a schematic representation of a tractor drive with driving pins arranged on the outer surface of the belt.
- FIG. 4 shows a schematic illustration of the effect of raising the recording medium in the area of the belt pulleys.
- FIG. 5 shows a schematic sectional illustration of a guide element lifting the record carrier in the area of the pulleys.
- FIG. 6 shows a schematic representation of a tractor drive with guide elements.
- FIG. 7 shows a schematic illustration in side view and in top view of a toothed belt with pink brackets arranged centrally thereon.
- FIG. 8 shows a schematic cross-sectional representation
- Tractor drives with centrally arranged pink brackets and driving pins with a cylindrical collar.
- FIG. 9 shows a schematic cross-sectional representation of the tractor drive of FIG. 8 along the section line B-C.
- FIG. 10 shows a schematic cross-sectional representation of a tractor drive with centrally arranged pink brackets and driving pins with a conical collar.
- FIG. 11 shows a schematic representation of the arching of the recording medium in the area of the perforations around the edge when using driving pins with a cylindrical collar.
- FIG. 12 shows a schematic representation of the forces in the area of the peripheral perforations of the record carrier in a tractor drive with centrally arranged pink brackets and driving pins with a conical collar.
- FIG. 13 shows a schematic cross-sectional representation of a tractor drive in the paper transport direction with a ramp-shaped paper guide plate lifting the recording medium in the area of the pulleys and
- FIG. 14 shows a schematic representation of the forces in the area of the detail "Z" of the tractor drive of FIG. 13.
- An electrographic printing device for printing on tape-shaped recording media 10 of different bandwidth contains, as intermediate media 11, an electric motor-driven photoconductor drum. Instead of the photoconductor drum, however, a band-shaped intermediate carrier, for example, can also be used Use OPC tape or a magneto-styli arrangement as described, for example, in EP-Bl-0 191 521.
- the various units for the electrophotographic process are grouped around the intermediate support 11. These are essentially: a charging means' 12 in the form ist ⁇ to Ladekorotron ⁇
- a character generator 13 with a light-emitting diode comb for character-dependent exposure of the intermediate carrier 11, which extends over the entire usable width of the intermediate carrier 11; a developer station 14 for coloring the character-dependent charge image on the intermediate carrier 11 with the aid of a one- or two-component developer mix; a transfer printing station 15 which extends over the width of the intermediate carrier 11 and with which the toner images are transferred to the recording medium 10.
- a cleaning station 16 is provided, with a cleaning brush integrated therein with the associated suction device and a discharge device 17.
- the intermediate carrier 11 is driven by an electric motor and moved in the direction of the arrow in printing operation.
- the printing device contains a fixing station 18 which is arranged downstream of the transfer printing station 15 in the transport direction of the recording medium and which is designed as a thermal printing fixing station, with a heated fixing roller 19 with an associated pressure roller 20, and guide rollers 21 which are arranged downstream of the fixing station and which, among other things, serve as dispensing gels serve elements for a stacking device 22 for the recording medium 10.
- a fixing station 18 which is arranged downstream of the transfer printing station 15 in the transport direction of the recording medium and which is designed as a thermal printing fixing station, with a heated fixing roller 19 with an associated pressure roller 20, and guide rollers 21 which are arranged downstream of the fixing station and which, among other things, serve as dispensing gels serve elements for a stacking device 22 for the recording medium 10.
- the fixing station shown other fixing stations are also possible, for example with a heated or unheated inlet saddle or a cold fixing station.
- the tape-shaped recording medium 10 is prepared as pre-folded endless paper provided with edge perforations and is fed from a storage area
- the recording medium is preferably transported via a transport device 25 assigned to the transfer printing station 15 in the form of transport belts 26 provided with pins 32, which are guided over pulleys in the form of toothed pulleys 27 into the perforations 31 of the edge of the recording medium 10 intervene.
- a deflection device 28 is arranged in the housing area of the printing device between the storage area 23 and the fixing station 8, via which the recording medium 10 is returned from the fixing station 18 to the transfer printing station 15.
- the electrographic printing device is suitable for printing on recording media with different bandwidths.
- the intermediate carrier 11 (photoconductor drum) has a usable width which corresponds to the largest possible recording carrier width (e.g. a format DIN A3 landscape). This width corresponds to twice the A4 bandwidth.
- the fixing station 18 and the other electrophotographic units, such as developer station 14, character generator 13, cleaning station 16, are designed in accordance with this usable width.
- Matching the width of the character generator 13 to different recording medium widths does not require any mechanical change to the character generator if, as in this case, an LED character generator is used, with a large number of LEDs arranged in rows. Adaptation to the recording medium width used is carried out electronically by control.
- the driving pins 32 are made of steel. They have a cylindrical collar 33 to which a tapering head part 34 connects. The record carrier 10 is transported over the cylindrical collar 33.
- the tapering head part 34 serves as a threading element.
- the recording medium 10 in the region of the belt wheel 27 is shifted or raised from the transport position A to such an extent as shown in FIG. 4 that the perforations move ⁇ holes 31 are in a rolling position B in the region of the tapering head part 34.
- the size of the displacement V depends, inter alia, on the angle of inclination of the tapered head part 34, the radius of the belt wheel 27, the belt thickness and the transport position of the recording medium. It is to be coordinated depending on these parameters so that when the pins are immersed and when they slide out during the rolling process, the perforation holes slide along the pin walls at a small distance without a substantial attack force acting on the hole wall.
- the actual advance for the recording medium takes place in the straight transport area of the pen guide between the belt wheels.
- the pins should be able to slide freely in the perforation holes.
- a paper guide element 35 is arranged in the area of the belt wheels 27 in accordance with FIGS. It extends into the straight area (transport path) of the pen guide and lifts the record carrier, for example, by about 1 mm.
- a support device 36 supporting the belt 26 in the transport area between the belt pulleys 27 in the form of, for example, a hold-down device has hold-down elements 37 for the recording medium 10 arranged before and after the paper guide elements 35. These can consist of rolls or of guide plates or the like.
- the driving pins 32 (pins) are driven by a motor-driven endless toothed belt 26, which has ⁇ its inner circumferential flat transport tooth 39, which has a predetermined spacing between the peripheral perforations 31 of the recording medium 10 oriented tooth pitch are arranged.
- the transport teeth 39 have a predetermined uniform distance from one another, which in turn is dependent on the given normalized distance of the edge perforations 31 of the recording medium 10. This means, for example, that two transport teeth are arranged per edge perforation distance.
- the toothed belt 26 is designed, for example, as a glass-fiber-reinforced toothed belt, on which the driving pins 32 are fastened via the plastic clips 38 (pink clips) which encompass the belt 10.
- Tooth gaps 40 Open between the transparent teeth 39 Tooth gaps 40. These are limited by the oblique tooth flanks 41 of the transport tooth. With evenly spaced transport teeth, the tooth pitch is also defined by the number of tooth gaps per unit length (eg edge perforation distance).
- the timing belts are so precisely manufactured that the pitch errors from tooth to tooth are extremely small. An accuracy which is only a fraction of the required line accuracy. For this reason, the driving pins 32 on the outer circumferential surface of the toothed belt 26 are juiced depending on the tooth pitch.
- each individual pinklammer 38 carrying a driving pin 32 consists of two parts, as shown in FIGS. 7 to 10.
- One part is the pink lammer base body 42, on which the driving pin 32 is seated, cast into the base body 42.
- the second part is the pinklammer clamp web 43.
- the pinklammer clamp web 43 is placed in the tooth space 40 of the toothed belt 26 and the pinklammer base body 42 is snapped onto the pin clamp clamp web 43.
- the two legs of the clamping webs 43 which are designed as hooks 44 (FIG. 8), snap into the corresponding counterpart 45 of the base body 42 with a pre-tension.
- the division centering is achieved by the position of the clamping web 43 in the tooth space 40 of the belt.
- the edges of the clamping web facing the tooth flanks 41 of the belt 26 have a slope 46 (adjustment slope) which corresponds to the tooth flank shape of the belt 26.
- Clamping web 43 is therefore centered in tooth gap 40 due to its prestress.
- clamping web 43 Since the clamping web 43 is slightly bent by the pretension, it is advantageous to have the clamping web 43 centered linearly in the tooth space 40 with a maximum base (FIGS. 8, 9).
- the line-shaped edition is made by Support nipple 47 provided on the clamping web 43 is reached. If this linear support were not provided, an undefined position of the clamping web 43 in the tooth space 40 and thus an incorrect division of the driving pins 32 would occur.
- the driving pins 32 (pins) made of metal are poured into the clamp base body 42 by means of an injection molding tool.
- This injection molding tool cannot be manufactured with an arbitrarily exact tolerance. This means that the metal pins 32 cannot be cast in the pinklammer base body 42 exactly in the center in the X and Y planes.
- the clip base body 42 has a recess 48 on one side and a centering or mounting nose 49 on the other side (FIG. 7).
- the clamp base body 42 can thus only be mounted in the correct position on the toothed belt 26.
- the centering nose 49 of the one clip only fits into the recess 48 of the adjacent clip.
- the pink clips 38 must lie as close as possible to one another in order not to allow the elasticity of the clamping in the toothed belt gap 40 to take effect. If the full length of the clamp base bodies 42 were to lie against one another, paper dust would be pressed between the clamps. Bracket damage and misalignment would result. By 'Klammunter ⁇ parung 48, the brackets 38 are only a very short Basi ⁇ by webs 50 in the edge areas to each other, the central region is free ( Figure 7). Paper dust and other dirt can thus fall out unpressed between the clamps 38.
- this paper guide plate shape produces a force component £ v in the paper web 10 which presses it against the feed bead cover 51. Paper flow problems and line-level errors in the printed image are the result.
- the conical guide surface shape of the driving pins also prevents this disruptive effect just described.
- the driving pins are usually arranged in brackets which lie next to the belts. Since the paper web has a resistance to the direction of transport, the pink brackets are inclined at this torque load. As a result, the paper web, the position of which is determined by the transport pins, deviates from the required target position. The toner image is then in the Transfer the transfer area offset to the paper web. Line spacing errors are the result.
- the clips 38 according to the invention are designed such that they lie centrally on the outer peripheral surfaces of the belts 26 (FIG. 7). A tilting moment cannot occur. Since the brackets 38 cannot be inclined, the position of the driving pins 32 is independent of the transport web fluctuations.
- the clip 38 according to the invention has arranged the driving pins 32 so that they are centered on the transport belt 26.
- the transmission of force from the driving pin to the transport belt thus takes place without a lever arm.
- no bending moment is transmitted to the clamp.
- a risk of destruction of the transport clamps in the event of a paper jam is therefore no longer present.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Advancing Webs (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19526731 | 1995-07-21 | ||
DE19526731 | 1995-07-21 | ||
PCT/DE1996/001096 WO1997004364A1 (de) | 1995-07-21 | 1996-06-21 | Vorrichtung zum transport von mit randlochungen versehenen aufzeichnungsträgern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0840908A1 true EP0840908A1 (de) | 1998-05-13 |
EP0840908B1 EP0840908B1 (de) | 2001-04-11 |
Family
ID=7767468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96918597A Expired - Lifetime EP0840908B1 (de) | 1995-07-21 | 1996-06-21 | Vorrichtung zum transport von mit randlochungen versehenen aufzeichnungsträgern |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0840908B1 (de) |
DE (1) | DE59606777D1 (de) |
WO (1) | WO1997004364A1 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3688959A (en) * | 1970-09-14 | 1972-09-05 | Standard Register Co | Pin belt mechanism for movement of a continuous strip |
DE3211492A1 (de) * | 1981-06-15 | 1982-12-30 | Veb Kombinat Robotron, Ddr 8012 Dresden | Endloses transportband zum transport randgelochter aufzeichnungstraeger |
JP2578664B2 (ja) * | 1989-06-16 | 1997-02-05 | 東海興業 株式会社 | 送りベルトサポーターを備えた紙送り装置 |
US5097999A (en) * | 1989-12-11 | 1992-03-24 | Seitz Corporation | Form feeding tractor utilizing a composite belt with metal pull pins |
-
1996
- 1996-06-21 WO PCT/DE1996/001096 patent/WO1997004364A1/de active IP Right Grant
- 1996-06-21 EP EP96918597A patent/EP0840908B1/de not_active Expired - Lifetime
- 1996-06-21 DE DE59606777T patent/DE59606777D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9704364A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1997004364A1 (de) | 1997-02-06 |
DE59606777D1 (de) | 2001-05-17 |
EP0840908B1 (de) | 2001-04-11 |
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