EP0769387B1 - Imprimante avec dispositif pour détecter le papier en rouleau - Google Patents

Imprimante avec dispositif pour détecter le papier en rouleau Download PDF

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Publication number
EP0769387B1
EP0769387B1 EP19960307524 EP96307524A EP0769387B1 EP 0769387 B1 EP0769387 B1 EP 0769387B1 EP 19960307524 EP19960307524 EP 19960307524 EP 96307524 A EP96307524 A EP 96307524A EP 0769387 B1 EP0769387 B1 EP 0769387B1
Authority
EP
European Patent Office
Prior art keywords
paper
roll
printing
type
detection unit
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
Application number
EP19960307524
Other languages
German (de)
English (en)
Other versions
EP0769387A2 (fr
EP0769387A3 (fr
Inventor
Shuichi c/o Alps Electric Co Ltd. Aratsu
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0769387A2 publication Critical patent/EP0769387A2/fr
Publication of EP0769387A3 publication Critical patent/EP0769387A3/fr
Application granted granted Critical
Publication of EP0769387B1 publication Critical patent/EP0769387B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41J11/009—Detecting type of paper, e.g. by automatic reading of a code that is printed on a paper package or on a paper roll or by sensing the grade of translucency of the paper
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H16/00—Unwinding, paying-out webs
    • B65H16/02—Supporting web roll
    • B65H16/06—Supporting web roll both-ends type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/0006—Article or web delivery apparatus incorporating cutting or line-perforating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/415—Unwinding
    • B65H2301/4152—Finishing unwinding process
    • B65H2301/41524—Detecting trailing edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/40—Identification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/514—Particular portion of element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/515—Absence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing
    • B65H2513/51—Sequence of process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/13—Parts concerned of the handled material
    • B65H2701/131—Edges
    • B65H2701/1311—Edges leading edge

Definitions

  • This invention relates to a printing device like an ink jet printer for ejecting ink onto roll paper for printing. More specifically, this invention relates to a printing device for detecting type of roll paper loaded, the presence or absence of the roll paper, the leading end of the roll paper, and a preferable roll paper to be used in a printng device.
  • an electrophotographic copier which causes a toner to adhere onto an electrostatic potential image formed on the paper roll and transcript the toner image onto the printing paper
  • a printing device which is called an ink jet printer of the aforementioned ink jet type or a printing device which is called a thermal transfer printer of a thermal transfer type which is adapted to melt the ink on the ink ribbon by means of a heated thermal head or cause the heat sensitive paper to be colored
  • the roll paper payed out from the paper roll is fed in an opposite direction to the regular feed direction to reduce a margin space in the leading end of the paper as much as possible.
  • the printing device is constructed such that it performs the printing operation by switching the printing conditions in accordance with the type of printing paper to be used
  • printing can be done on a condition other than suited for the paper if the operator makes an erroneous setting concerning the type of printing paper with the result that the printing quality desired by the operator cannot be obtained.
  • the operator uses a printing device of the ink jet type which for example can perform a printing operation in not prescibed ink quantity for some type of printing paper. In this way, if setting is done on the basis of a wrong type of paper, extra ink used can adhere to some portions of the printing device to such an extent as thus staining the printing device or the printing paper.
  • Detecting devices used in a conventional printing device are known as a lever type, an optical type, etc.
  • an optical type paper detection mechanism includes a reflection type in which a light irradiated by the light emitting portion onto the paper to be reflected thereby is detected by the light receiving portion and a transmission type in which a light transmitted is detected by a light receiving portion positioned opposite the'light emitting portion.
  • optical paper detection mechanism of reflection type permits the variation of the intensity of reflection of the light irradiated by the light emitting portion on the basis of the presence or absence of the printing paper to be converted into the variation of the electrical output for detection.
  • optical paper detection mechanism of transmission type converts into the variation of electrical output the variation of intensity of light determined depending on whether or not to interrupt the light irradiated by the light emitting portion on the basis of the presence or absence of the printing paper.
  • the mechanism In the conventional printing paper detect mechanism, it is possible to detect the presence or absence of the printing paper regardless of the light transmitting property whether transparent or opaque if the mechanism is of a lever type.
  • such mechanism has a problem that it is necessary to bring the lever in contact with the platen by way of the printing paper in order to detect the presence or absence of the printing paper at the printing portion, causing the lever to contact the platen directly if there is no printing paper thereat with the result that the platen can be damaged. Therefore, an optical paper detect mechanism of reflection type is used in general as a paper detection mechanism.
  • Such optical paper detection mechanism of reflection type has another problem that it is impossible as is to detect the presence or absence of the printing paper if the paper is a light transmitting transparent sheet such as OHP paper. Then, a light reflecting opaque portion is formed at an end portion (said end portion taken in a direction perpendicular to the paper feed) of the transparent sheet so that said opaque portion reflects the light to be detected.
  • a light reflecting opaque portion is formed at an end portion (said end portion taken in a direction perpendicular to the paper feed) of the transparent sheet so that said opaque portion reflects the light to be detected.
  • such method also has a problem that the opaque portion at the end of the printing paper makes it impossible to effectively use the entire surface of the printing paper and makes the opaque portion too conspicuous to prevent the printed image from viewed easily when projected by an over head projector.
  • a printing device is characterized by a holder engaging member which is movable and can be applied onto peripheral surface of the flange of said holders of said paper roll held by said paper roll holding mechanism, by a paper type detection unit for detecting type of said roll paper according to the position of said flange engaging correspondingly to outer diameter of said flange representing type of said roll paper used, by a paper presence/absence detection unit for detecting the presence or absence of said roll paper without contact therewith is located in said printing portion so as to oppose to said platen, by a paper leading end detection unit for detecting the leading end of said roll paper is located between said printing portion and a cutting portion, and control means for controlling actions of the relevant portions on the basis of the detection result of each detection unit.
  • said paper type detection unit can automatically detect type of paper only by amounting a flange, outer diameter of which is adapted to type of roll paper
  • said paper presence/absence detection unit can automatically detect the presence or absence of said roll paper without contact therewith
  • said paper leading end detection unit can automatically detect whether the paper leading end of said roll paper is in a appropreate position or not
  • control means can control appropreate actions of the relevant portions on the basis of the detection result of each detection unit.
  • the printing device is characterized in that the detecting unit of paper presence/absence is composed of a photosensor while the control means is constructed to determine the paper type by reversing information from the photo sensor on the basis of a result whether or not light transmission.
  • the it is possible to automatically detect the presence/absence of the roll paper by means of the photosensor notwithstanding the result as to whether or not the roll paper is of light transmitting nature.
  • the printing device according to Claim 3 is characterized by the roll paper being formed of a light transmitting transparent sheet and having a light reflector at the trailing end thereof.
  • An embodiment of printing device 1 according to the present invention as shown in Fig.1 and Fig.2, has a housing 2, in which a cylindrical platen 3 is rotatably mounted with its axis extending in horizontal direction. Said surface of platen 3 can absorb light and is controlled not to reflect light such as a coarse surface to assure difused reflection or blacked surface to absorb light.
  • a driven pulley (not-shown) is supported by one end to said platen 3, a belt 5 driven by a first reversible motor 4 being wound on said driven pulley. Accordingly, said platen 3 can be driven by driving force of said first motor 4 in the normal transporting direction or in the reverse direction.
  • a paper roll 6 having an axis parallel to said platen 3 is mounted on the rear side of said platen 3 in said housing 2.
  • roll paper 6a to be used is released out of paper roll 6 to be wound on the upper side of said platen 3.
  • Said paper roll 6 is supported as shown in Fig. 3 on a pair of holding portions 9A and 9B of the paper roll holding mechanism over a base section 7 of the printing device 1 with a spacing therebetween in a longitudinal direction.
  • the holding portion 9B is detachably 'loaded at a plurality of positions on a holding portion supporting plate 10 to fit the width of the roll paper 6a.
  • a detection unit 11 of paper type for detecting the type of the roll paper 6a used as a printing paper.
  • said paper roll 6 comprises said roll paper 6a wound on a paper tube (not-shown), said paper tube having paper tube holders 6b, 6b mounted on its both ends, and these paper tube holders being held respectively by said roll holders 9A, 9B.
  • Said each paper tube holder 6b, 6b has round flange portion 6c having a diameter larger than that of roll paper 6a.
  • the diameter of said flange portions 6c has different size according to the type of roll paper 6a wound on said paper tube, i.e. common paper, coat paper, film for OHP, back print film, burnished film and the like. Accordingly, one can identify the paper type according to the diameter of flanges 6c used.
  • a light reflecting portion 12a is provided only at a trailing end of the light transmitting transparent sheet 12 as shown in Fig. 5(a).
  • the light reflecting portion 12a may be provided at opposite sides perpendicular to the longitudinal direction as shown in Fig. 5 (b). So long as provided at the trailing end thereof, the structure is not limited to this embodiment.
  • said detection unit of paper type 11 for outputting detection signals for detecting type of said roll paper 6a has a base plate 13 located adjacent to one of said roll holders 9A. Said base plate 13 supports above it a pair of parallel guide rods 14, 14 which are parallel to each other and extend in horizontal direction so as to verticaly cross the axis of said paper roll 6.
  • a sliding table 15 is mounted on said guide rods 14,14 so as to shift along the extending direction of said rods 14.
  • a bracket 16 extends upwardly on the one end of said sliding table 15, and said bracket 16 supports thereon a flange abutting block member 17 having its one side surface 17a used as a flange abutting surface.
  • a coil spring 18 is provided between said base plate 13 and said sliding table 15 so as to urges said sliding table 15 in the direction A shown in Fig. 6(A) for pressing said flange abutting member 17 onto said flange 6c of said paper roll 6.
  • a wire 19 as a manipulating member is connected to said bracket 16.
  • a hollow tube 20 is fixed on an edge portion of said base plate 13 so as to extend from the fixing point of said wire 19 on said bracket 16 in a reverse direction B to the urging direction A of said coil spring 18.
  • Said wire 19 passes through said tube 20 and extends outside of said base plate 13, the other end of said wire 19 being fixed onto said cover 2A (Fig.2). Consequently, when opening said cover 2A, said sliding table 15 is shifted by said wire 19 in the direction B' against the urging force of said coil spring 18. Accordingly, when exchanging paper roll 6, said flange abutting member 17 as an example of roll holder abutting member is retracted into a retracted position. Further, when said cover 2A is closed, said wire 19 is relaxed and said sliding table 15 is pulled in the direction A due to the urging force of said coil spring 18.
  • Three photosensors 21A,21B,21C and an output connector 23 for outputting signals from respective photosensors 21 to said controller 22 are located on said base plate 13.
  • Said respective photosensors 21 have respectively a U-form, and three state setting sheets 25 having each plate form to be inserted into the hollow portions of corresponding photosensors 21 are supported on the rear side surface of said sliding table 15 so as to engage into respective photosensors 21.
  • Each state setting sheet 25 is a shielding plate for shielding light from light emitting portion of each photosensor so as not to reach light receiving portion thereof, while said state setting sheet 25 has slits (not-shown) allowing light from light emitting portion thereof to reach light receiving portion thereof.
  • Each photosensor 21 has a construction such that it outputs signal ON when light from light emitting portion reaches light receiving portion, while it outputs signal OFF when light from light emitting portion does not reach light receiving portion.
  • the position of sliding table 15 with respect to said base plate 13 is changed correspondingly to diameter of said flange 6c at the end of paper roll 6.
  • each photosensor 21A,21B,21C outputs ON signal or OFF signal to said CPU board 26 (Fig.7) according to the position of said slits of corresponding state setting sheet 25.
  • said CPU of said CPU board 26 of the control means 22 can thus detect the type of paper (roll paper 6a) according to the flange diameter obtained by combination of ON or OFF signals issued from respective three photosensors 21 as shown in the following Table 1.
  • the types of paper thus detected are output to said CPU board 26 and are displayed on a displaying panel (not-shown) of the printing device 1.
  • Paper Type Flange Diameter (mm) Sensor A Sensor B Sensor C No Paper 0 ON ON ON ON 1 48 - 52 OFF ON OFF 2 58 - 62 OFF OFF ON 3 70 - 74 ON OFF ON 4 80 - 84 OFF ON ON 5 88 - 92 ON ON OFF 6 98 - 102 ON OFF OFF OFF
  • Sensors A, B and C shown in this Table 1 designated respectively said photosensors 21A, 21B and 21C.
  • Said CPU board 26 can carry out image processing and driving of ink jet heads (not-shown) shown in Table 2 correspondingly to detected type of paper.
  • a carriage 27A of said ink jet unit 27 has thereon a plurality of ink jet heads (not-shown) which are directed agaist said platen 3. The position where said ink jet heads discharge ink toward the roll paper 6a held against the outer periphery of the platen 3 is designated as a printing portion PP (Fig. 2) to do the printing against the roll paper 6a.
  • a driving belt 28 is connected to said ink jet unit 27, and said driving belt 28 is wound about a driving pulley 30 which is driven by a second motor 29 of reversible type. Accordingly, when driving said second motor 29, said ink jet unit 27 is reciprocated along said platen 3 under the guidance of a guide shaft 31 located in parallel to said platen 3.
  • a pump unit 32 for covering the nozzles of restrictive ink jet heads of said ink jet unit 27 for the purpose of recovering operation thereof is located on one side of the other end portion of said platen 3, and an exhaust liquid tank 33 is provided adjacent to said pump unit 32.
  • Photointerrupters 34 of transmission type are located with a distance therebetween in the front and back direction of said carriage 27A on the bottom side of said carriage 27A of said ink jet unit 27, and a linear encoder 35 comprising a thin plate having therein a number of small holes corresponding to printing resolution is located along the whole range of shifting ink jet unit 27.
  • a detection unit 36 for detecting roll paper 6a on said platen 3 is located on the upstream side of said ink jet unit 27 in the normal conveying direction of said roll paper 6a so as to oppose said platen 3.
  • Said roll paper presence/absence detection unit 36 has photosensors 37 to emit a light from the light emitting portion toward the outer periphery of the platen 3. The thus emitted light is reflected by the roll paper 6a positioned on the platen 3 such that the intensitiy of the reflected light is converted into an electrical signal by the light receiving portion to be sent to the control means 22 which will be explained later.
  • Cutting unit 40 consisting of long sized fixed blade 38 and movable blade 39 for cutting printed roll paper 6a is located below said platen 3 and ink jet unit 27.
  • Said paper detection unit 41 for detecting roll paper 6a is located between said printing portion PP and said cutting portion CP.
  • the detection unit 41 of the paper leading end is for determining whether or not the reverse feed amount of the roll paper 6a is adequate at such a time as the cut roll paper 6a to be subjected to printing is fed backwardly of the regular feed direction.
  • a lever switch not shown detects the leading end (cut end) of the roll paper 6a
  • a detect signal is emitted to the control means 22 which will be explained later. Then, said control means 22 stops driving the first motor 4 which is feeding the roll paper 6a backwardly.
  • Each driving portion such as said both paper detection units 11,36,41 and said both motors 4,29 and ink jet unit 27 is respectively connected to a control means 22, so that when signals about roll paper 6a from said paper detection units 11,36,41 are input into said control means 22, this control means 22 controls said respective motor 4,29 and ink jet unit 27 conrrespondingly to the input signals.
  • the upper opening (not-shown) of said housing 2 is covered by a closing cover 2A.
  • Fig. 7 shows a control block diagram of printing device including said control means 22.
  • said control means 22 consisits of a mother board 42 having a control panel (not-shown); a CPU board 26, a mechanical control board 43 and a head control board 44 connected to each other via said mother board 42.
  • Said mother board 42 is connected to a paper detection unit 11 for detecting the type of roll paper 6a used, a paper presence/absence detection unit 36 for detecting the presence or absence of said roll paper, a paper leading end detection unit 41 for detecting the leading end of said roll paper, said pump unit 32; said exhaust liquid tank 33; a CR unit 45 for driving said second motor 29 shifting said ink jet unit 27; a LF unit 46 for driving said first motor 4 conveying said roll paper 6a.
  • Said CPU board 26 has built-in CPU, ROM, RAM and the like, among which ROM has programs for operation and graphic processing, and carrying out printing based on corresponding deteciton result, such as type of paper, presence or absence of paper, leading end of paper by detecting signals provided by each detection unit 11,36 and 41.
  • Said mechanical control board 43 includes drivers (not-shown) for driving said detection units 11,36 and 41, pump unit 32, CR unit 45 and LF unit 46. Further, said mechanical control board 43 can transfer signals to said CPU of said CPU board 26.
  • Said head control board 44 has ink detection board 47 and head drive board 48, and transfers a detection signal of residual ink quantity detected by said ink detection board 47 located on said ink jet unit 27 to said CPU of said CPU board 26, and, in said head drive board 48, said head control board 44 also transfers logical signals based on information from said CPU for driving said ink jet unit 27. Based on said logical signals, said head drive board 48 generates driving signals for driving respective ink jet head 49 and respective ink cartridge 50.
  • said linear encoder 35 is connected in parallel to said second motor 29, said linear encoder 35 outputting to said CPU of said CPU board 26 signals correspondingly to rotational speed of said second motor 29 for equalizing the shifting speed of said ink jet unit 27.
  • said mother board 42 is provided with interface unit 51,52 for connecting this printing device 1 to personal computer and the like.
  • the program stored in said CPU board 26 determines the presence of the paper upon detection of an intense reflection and outputting an electrical signal HIGH by the photosensor 37 of the detection unit 36 of paper presence/absence when the paper (roll paer 6a) detected by the detection unit 11 of paper type is opaque.
  • the paper detected by the detection unit 11 of the paper type is transparent, most of the light emitted by the light sensor 36 of the detection unit 36 of the paper presence/abasence permeates the paper to be absorbed by the surface of the platen such that the photosensor 37 of the detection unit 36 of the paper presence/absence will not detect the reflection and emits an electrical signal LOW to determine the presence of the paper.
  • control means 22 is constructed to perform a reverse determination concerning the information from the photosensor 37 of the detection unit 36 of paper presence/absence based on the result obtained by the detection unit 11 of the paper type as to whether the paper 6a is of light transmitting nature or not.
  • cover 2A is opened for mounting a paper roll 6 including a desired type of roll paper 6a onto roll holding mechanism 8.
  • Wire 19 connected to this cover 2A is thus pulled in the direction B against the urging force of coil spring 18, so that sliding table 15 connected to this wire 19 is also pulled in the same direction B and flange abutting member 17 is retracted into a retraction place so as not to impede inserting operation of paper roll 6.
  • holders 6b having each flange 6c of outer diameter adapted to that of roll paper 6a mount paper roll 6 on both roll holders 9A, 9B of roll holding mechanism 8.
  • CPU of CPU board 26 Upon switching printing device power supply into ON, CPU of CPU board 26 initializes respecvtive parts 26,43,44,47,48 and respective units 27,32,45,46 and respective detection mechanism 11,36,41 and than recognizes type of paper used, presence or absence of paper on the prinnting portion PP, position of leading end of paper, by means of signals from paper detection unit, paper presence/absence detection unit and paper leading end detection unit, respectively.
  • the recognition of the paper by means of the photosensor of the detection unit 36 of the paper presence/absence for the control means 22 is constructed to perform a determination by reversing the information from the photosensor 37 of the detection unit 36 of the paper presence/absence on the basis of the result as to whether the paper is light transmitting or not.
  • the photosensor 37 of the detection unit 36 of paper presence/absence detects an intense reflection by the surface of the roll paper 6a to emit an electrical signal HIGH for the control means 22 to provide a determination of "paper present” when the roll paper 6a is on the platen 3 whereas the light emitted by the photosensor 37 is directly irradiated onto the surface of the platen 3 to be absorbed by its surface such that the photosensor 37 will not detect the reflected light and emits an electrical signal LOW for the control means 22 to provide a determination of "paper absent".
  • the photosensor 37 will not detect the reflected light because most of the light irradiated by the photosensor 36 of the detection unit 36 of paper presence/absence permeates the paper directly onto the surface of the platen 3 to be absorbed thereby when the roll paper 6a is positioned on the platen 3. In such situation, the photosensor emits an electrical signal LOW such that the contorl means 22 provides a determination of "paper present".
  • the photosensor detects an intense reflection from the light reflecting portion 12a formed of a transparent sheet and positioned at the trailing end of the roll paper 6a on the platen and outputs an electrical signal HIGH such that the control means 22 provides a determination of "paper absent".
  • control means 22 is constructed to perform a determination by reversing the output (information) from the photosensor 37 based on the result obtained by the detection unit 11 of the paper type as to whether the roll paper 6a is of light transmitting nature or not.
  • the roll paper 6a is cut off at its trailing end by the paper cutting unit 40 after the printing action to form a separate sheet of paper which is discharged to complete the printing operation.
  • the printing operation of a sheet of paper it is needed for performing the next printing action to rewind the roll paper 6a by a predetermined distance by the first motor 4 because the distance from the printing portion PP to the cutting portion CP is larger than the margin formed at the leading end of the paper at the time of an ordianry printing action.
  • the amount of reverse feed of the roll paper 6a is sufficiently compensated for by feeding the roll paper 6a backwardly a constant amount if the leading end of the roll paper 6a is always positioned at the cutting portion CP.
  • the position of the leading end of the roll paper 6a varies depending on situations so that the amount of reverse feed of the roll paper 6a is determined by the result of detection of the leading end of the roll paper 6a by means of detection unit 41 of the paper leading end.
  • the control means 22 controls the amount of reverse feed for the roll paper 6a by driving the second motor 29 until the detection unit 41 of the leading end of the paper detects the leading end of the roll paper after the roll paper 6a is cut off at its trailing end by the paper cutting mechanism 40 such that position of the leading end of the roll paper 6a for the printing action is done at a position suitable for printing.
  • said CPU receives signals for recognizing ink type. By using the data of detected type and type of ink and/or paper, said CPU looks up data table written in ROM of said CPU board 26, thereby to set the procedure of the printing data and to set servo constant to determine the printing speed.
  • the printing is done in accordance with the type of ink and paper.
  • type of paper can be automatically detected upon mounting of said paper roll 6 onto roll holder 9A,9B as described above, double printing and/or inferior image quality due to input error of paper type by operator can be prevented. Further, since paper used is automatically detected according to outer diameter of flanges 6c, more various types of paper can be handled by increasing the number of sensors. Further, since flange abutting member 17 is retracted when exchanging paper roll 6, flange abutting member 17 does not impede the exchange of paper roll 6.
  • said detection unit 11 of the paper type is capable of automatically detecting the paper type from the position of the flange abutting member 17 abutting againt said flange 6c merely by attaching a flange 6c to the paper roll 6, said flange having an outer diameter corresponding to the type of the roll paper 6a.
  • Said detection unit 36 of the paper presence/absence is capable of automatically detecting the presence/absence of the roll paper 6a without contact.
  • Said detection unit 41 of the paper leading end is capable of automatically detecting the leading end of the roll paper 6a subjected to printing to determine whether said leading end is properly positioned or not.
  • Said control means 22 is capable of controlling the relevant portions such that a proper printing action onto the roll paper is assured on the basis of the detection result of the respective detection units 11, 36 and 41 and capable of automatically detecting the presence/absence of the roll paper to be positioned at the printing portion PP by means of the photosensors 37, regardless of whether the roll paper 6a is of light transmitting nature or not.
  • said detection unit 11 of paper type is adapted to output a signal indicating "paper absent" when the. paper roll 6 is not loaded to the paper roll holding mechanism 8 while the control means 22 makes the printing action impossible.
  • the roll paper 6a is formed of a transparent sheet which is light transmitting, with the trailing end of said transparent sheet 12 being formed with a light reflecting portion 12a. Therefore, it is possible to effectively use the entire surface of the roll paper 6a even if the roll sheet formed of the transparent sheet 12 of light transmitting nature is used. Moreover, the light reflecting portion 12a of the roll paper 6a makes it possible for the photosensors 37 in the detection unit 36 of paper presence/absence to automatically detect the trailing end of the roll paper 6a.
  • the present invention is not limited to the above described embodiments but can be modified if necessary.
  • the present invention is characterized in that the detection unit of paper type is capable of automatically detecting the paper type on the basis of the position of the flange abutting member which abuts against the flange merely if the flange having an outer diameter corresponding to the type of the roll paper is attached to the paper roll, that the detection unit of paper presence/absence is capable of automatically detect the presence/absence of the paper without contact thereto, that the detection unit of the paper leading end is capable of automatically detecting the paper leading end to determine whether said leading end is properly positioned, and that the control means is capable of controlling the relevant portions to perform the proper printing actions on the basis of the detection result of the respective detection units.
  • the roll paper used by the present invention makes it possble to effectively use the entire surface of the roll paper when the roll paper formed of the transparent sheet of light transmitting nature is used and to automatically detect the trailing end of the roll paper in the detection unit of paper presence/absence by means of the light reflecting portions of the roll paper.

Claims (3)

  1. Un dispositif d'impression (1) dans lequel un rouleau de papier (6) est soutenu dans un mécanisme de support de rouleau de papier par le biais de supports (6b) fixés au niveau des extrémités opposées dudit rouleau de papier (6), chaque support (6b) étant formé d'un flasque (6c), le papier en rouleau (6a) étant dévidé dudit rouleau de papier (6) de telle sorte que l'impression s'effectue sur ledit papier en rouleau dévidé (6a) au moyen d'une platine (3) et de têtes d'impression, ledit rouleau de papier imprimé (6) étant coupé par un mécanisme de coupe de papier (40),
    ledit dispositif d'impression (1) comprenant un élément amovible butant contre le flasque (17) prévu pour être appuyé contre une périphérie externe dudit flasque (6c) du support (6b) du rouleau de papier (6) que supporte ledit mécanisme de support de rouleau de papier, ledit flasque (6c) ayant un diamètre externe établi en correspondance avec le type dedit papier en rouleau (6a); une unité de détection (11) de type de papier prévue pour être soumise à un positionnement par ladite périphérie externe du flasque (6c) afin de détecter ledit type de papier en rouleau (6a) ; une unité de détection (36) de présence/d'absence de papier fournie au niveau d'une portion d'impression (PP) et faisant face à ladite platine (3) servant à détecter la présence/l'absence dudit papier en rouleau (6a) sans être en contact avec celui-ci ; une unité de détection (41) agencée entre ladite portion d'impression (PP) et une portion coupante (CP) pour détecter le côté entrée de feuille dudit papier en rouleau (6a) devant être soumis à une opération d'impression ; et un moyen de commande (22) pour commander les actions des portions pertinentes sur la base du résultat de détection de chaque mécanisme de détection (11, 36, 41).
  2. Un dispositif d'impression (1) selon la revendication 1, dans lequel ladite unité de détection (36) de présence/d'absence de papier est constituée d'un détecteur photosensible (37), ledit moyen de commande (22) étant construit de façon à déterminer le type de papier en inversant les informations provenant du détecteur photosensible (37) sur la base d'un résultat de détection suivant que ledit papier en rouleau est de nature à transmettre la lumière ou non.
  3. Un dispositif d'impression tel que revendiqué dans la revendication 1 ou la revendication 2, dans lequel ledit rouleau de papier comprend un papier en rouleau (6a) constitué d'une feuille transparente de nature à transmettre la lumière (12), dans laquelle une portion réfléchissant la lumière est formée au niveau de son extrémité arrière.
EP19960307524 1995-10-17 1996-10-16 Imprimante avec dispositif pour détecter le papier en rouleau Expired - Lifetime EP0769387B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP26830195 1995-10-17
JP268301/95 1995-10-17
JP26830195A JP3405867B2 (ja) 1995-10-17 1995-10-17 記録装置およびロール紙

Publications (3)

Publication Number Publication Date
EP0769387A2 EP0769387A2 (fr) 1997-04-23
EP0769387A3 EP0769387A3 (fr) 1998-06-24
EP0769387B1 true EP0769387B1 (fr) 2001-07-25

Family

ID=17456634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960307524 Expired - Lifetime EP0769387B1 (fr) 1995-10-17 1996-10-16 Imprimante avec dispositif pour détecter le papier en rouleau

Country Status (3)

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EP (1) EP0769387B1 (fr)
JP (1) JP3405867B2 (fr)
DE (1) DE69614064T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10158944B4 (de) * 2001-12-03 2006-03-16 Eastman Kodak Co. Elektrofotografisch arbeitende Druckmaschine
JP2005154148A (ja) * 2003-10-30 2005-06-16 K D K Kk フィルムシート繰り出し手段
JP6311334B2 (ja) * 2014-02-03 2018-04-18 セイコーエプソン株式会社 液体吐出装置及び電磁波硬化型液体の硬化方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0729428B2 (ja) * 1985-12-24 1995-04-05 セイコーエプソン株式会社 インクジエツト記録装置
JPS63237970A (ja) * 1987-03-26 1988-10-04 Matsushita Electric Ind Co Ltd 記録装置及びロ−ル状記録紙保持用ホルダ−
JPH02175170A (ja) * 1988-12-27 1990-07-06 Tokyo Electric Co Ltd プリンタにおける用紙の位置決め方法
EP0566259B1 (fr) * 1992-04-14 1997-10-15 Tektronix, Inc. Support d'enregistrement pour transparents
EP0750994B1 (fr) * 1995-06-27 2003-05-14 Fuji Photo Film Co., Ltd. Appareil d'impression

Also Published As

Publication number Publication date
JP3405867B2 (ja) 2003-05-12
JPH09109495A (ja) 1997-04-28
DE69614064D1 (de) 2001-08-30
EP0769387A2 (fr) 1997-04-23
EP0769387A3 (fr) 1998-06-24
DE69614064T2 (de) 2002-03-21

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