US20100194034A1 - Density unevenness reduction method and sheet transport mechanism - Google Patents

Density unevenness reduction method and sheet transport mechanism Download PDF

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Publication number
US20100194034A1
US20100194034A1 US12/636,272 US63627209A US2010194034A1 US 20100194034 A1 US20100194034 A1 US 20100194034A1 US 63627209 A US63627209 A US 63627209A US 2010194034 A1 US2010194034 A1 US 2010194034A1
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US
United States
Prior art keywords
gears
roller
paper feed
transport mechanism
sheet
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.)
Abandoned
Application number
US12/636,272
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English (en)
Inventor
Zenko Motoki
Yoshibumi Abe
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Assigned to ALPS ELECTRIC CO., LTD. reassignment ALPS ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABE, YOSHIBUMI, MOTOKI, ZENKO
Publication of US20100194034A1 publication Critical patent/US20100194034A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/0009—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets control of the transport of the copy material
    • 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/02—Rollers
    • B41J13/076—Construction of rollers; Bearings therefor
    • 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
    • G03G15/6529—Transporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/40—Toothed gearings
    • B65H2403/42—Spur gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/50—Diminishing, minimizing or reducing
    • B65H2601/52—Diminishing, minimizing or reducing entities relating to handling machine
    • B65H2601/524—Vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/06—Office-type machines, e.g. photocopiers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/12—Single-function printing machines, typically table-top machines

Definitions

  • the present disclosure relates to a density unevenness reduction method of a printing apparatus including a sheet transport mechanism which transmits a driving force of a driving device to a roller for transporting a sheet via a plurality of gears, and the sheet transport mechanism.
  • a sheet transport mechanism which transmits a driving force of a drive motor as a driving device to a roller used for transporting a sheet such as a platen roller or a paper feed roller via a plurality of gears so as to rotate the roller has been used.
  • Japanese Unexamined Patent Application No. 11-295949 a drive transmission mechanism in which gear mesh frequencies are different from each other is disclosed.
  • a driving device including a rotor in which the module and the number of teeth of a large gear are different from those of a small gear in a multiple-gear is disclosed.
  • a density unevenness reduction method of a printing apparatus having a sheet transport mechanism which transmits a driving force of a driving device to a roller via a plurality of gears to drive the roller for transporting a sheet.
  • the method includes: assuming one tooth and one turn of each of the gears each to be a simple harmonic oscillation of a single sine wave, and generating a synthesized wave of the sine waves of the gears; and adjusting the module and the number of teeth of each of the gears so as not to allow the amplitude of the frequencies of the synthesized wave to be significant over a long period, thereby dispersing a frequency at which the oscillations of the gears overlap and are amplified in the synthesized wave.
  • the long period in this aspect is not a period for each tooth or each turn of an individual gear but indicates a period of whizzing that occurs when the synthesized wave of the gears is generated.
  • the statement that the amplitude of the frequency of the synthesized wave is not significant means that sharp peaks and regular peaks do not exist in the synthesized sine wave.
  • errors in engagement of gears can be reduced when the printing apparatus prints on a sheet while the sheet transport mechanism transports the sheet, thereby suppressing a change in paper feed speed.
  • a sheet transport mechanism including: a roller used for transporting a sheet; a driving device for driving the roller; and a plurality of gears for transmitting a driving force of the driving device to the roller, wherein, assuming one tooth and one turn of each of the gears each to be a simple harmonic oscillation of a single sine wave, a synthesized wave of the sine waves of the gears is generated; and the module and the number of teeth of each of the gears are adjusted so as to disperse a frequency at which the oscillations of the gears overlap and are amplified in the synthesized wave and shortens the amplitude of the frequency of the synthesized wave over a long period.
  • the long period in this aspect is not a period for each tooth or each turn of an individual gear but indicates a period of whizzing that occurs when the synthesized wave of the gears is generated.
  • the statement that the amplitude of the frequency of the synthesized wave is not significant means that sharp peaks and regular peaks do not exist in the synthesized sine wave.
  • errors in engagement of gears can be reduced when the printing apparatus prints on a sheet while the sheet transport mechanism transports the sheet, thereby suppressing a change in paper feed speed.
  • the roller is a paper feed roller disposed on at least one of the upstream side and the downstream side of a platen roller in a transport direction of the sheet.
  • the sheet transport mechanism can reduce errors in engagement of gears when the printing apparatus prints on a sheet while the sheet transport mechanism transports the sheet, thereby suppressing a change in paper feed speed.
  • the paper feed roller is configured as a projection roller of which a plurality of projection teeth engaged with the teeth of one of the gears are arranged in parallel with the circumferential direction of the paper feed roller, assuming one projection tooth and one turn of the paper feed roller each to be a simple harmonic oscillation of a single sine wave, a synthesized wave of the sine waves of the gears and the paper feed roller is generated, and the size of the paper feed roller and the number of projection teeth are set so as to disperse a frequency at which the oscillations of the gears and the paper feed roller overlap and are amplified in the synthesized wave so as to shorten the amplitude of the frequency of the synthesized wave over a long period.
  • the sheet transport mechanism can reduce errors in engagement of gears when the printing apparatus prints on a sheet while the sheet transport mechanism transports the sheet, thereby suppressing a change in paper feed speed.
  • the roller is a platen roller.
  • the sheet transport mechanism can reduce errors in engagement of gears when the printing apparatus prints on a sheet while the sheet transport mechanism transports the sheet, thereby suppressing a change in paper feed speed.
  • the density unevenness reduction method and the sheet transport mechanism in the aspects can reduce the generation of density unevenness such as jitter without an increase in production costs, thereby obtaining an image with high quality.
  • FIG. 1 is a perspective view illustrating the main part of a sheet transport mechanism according to an embodiment of the disclosure.
  • FIG. 2 is a flowchart of a process of setting the module and the number of teeth of each gear on the basis of a density unevenness reduction method according to the embodiment of the disclosure.
  • FIGS. 3A to 3 c are graphs showing oscillation components in the case where one tooth and one turn of each gear in the sheet transport mechanism illustrated in FIG. 1 are represented as a single sine wave.
  • FIG. 4 is a graph showing a synthesized wave of the sine waves of the gears illustrated in FIGS. 3A to 3C .
  • FIG. 5 is a graph showing a synthesized wave of the sine waves of gears in an example of the sheet transport mechanism.
  • FIG. 6 is a graph showing a synthesized wave of the sine waves of gears of a sheet transport mechanism.
  • FIG. 7 is a graph showing a synthesized wave of the sine waves of gears of a sheet transport mechanism.
  • FIG. 8 is a graph showing a synthesized wave of the sine waves of gears of a sheet transport mechanism.
  • FIGS. 1 to 8 a density unevenness reduction method according to an embodiment of the invention will be described with reference to FIGS. 1 to 8 .
  • FIG. 1 is a perspective view illustrating a sheet transport mechanism 1 of a printing apparatus 1 using a density unevenness reduction method according to an embodiment.
  • the sheet transport mechanism 1 may include, as a roller for transporting a sheet in a predetermined transport direction with rotation, a paper feed roller 2 having a cylindrical shape disposed on the upstream side in the transport direction from a platen roller (not shown).
  • the paper feed roller 2 may be rotated by the driving of a drive motor as a driving device via a plurality of gears having different gear ratios.
  • a paper feed gear 3 a of gears 3 may be fixed to an end portion of the paper feed roller 2 , and the paper feed gear 3 a may be engaged with a small gear (pinion) of a first gear 3 b which may be a double gear.
  • a large gear of the first gear 3 b may be engaged with a small gear of a second gear 3 c which may be a double gear such that a large gear of the second gear 3 c may be connected to the drive motor as the driving device (not shown) with a small gear 3 d.
  • FIG. 2 is a flowchart of a process of setting the module and the number of teeth of each of the gears 3 on the basis of the density unevenness reduction method.
  • a drive motor may be selected, and a torque needed for transporting a sheet and the gear ratio of the gears 3 may be set (ST 1 ).
  • the number of stages, the module, and the intermediate gear ratio of each of the gears 3 may be set (ST 2 ), and assuming one tooth and one turn of each gear 3 each to be the simple harmonic oscillation of a single sine wave, a synthesized wave of the sine waves of the gear 3 may be generated (ST 3 ).
  • a gear having an oscillation period of 0.6 mm pitch is used as the paper feed gear 3 a
  • a gear having an oscillation period of 0.15 mm pitch is used as the first gear 3 b
  • a gear having an oscillation period of 0.07 mm pitch is used as the second gear 3 c
  • sine waves as illustrated in FIG. 3A to 3C may be obtained in a graph in which a vertical axis represents an amplitude and a horizontal axis represents a pitch (mm).
  • Whether or not the amplitude of the frequency of the synthesized wave is significant over a long period may be determined by, for example, the existence of sharp peaks or regular peaks.
  • FIGS. 5 to 8 are graphs showing the synthesized waves of the sine waves of the selected gear 3 .
  • the amplitude of the synthesized wave is about ⁇ 2, however, the regular oscillation frequency is about 12 mm, so that whizzing for a long period may be predicted.
  • the gears 3 having oscillation periods of 0.26 mm, 0.46 mm, 0.52 mm, and 0.61 mm pitches are used for the sheet transport mechanism 1 , as shown in FIG.
  • the oscillation period of the synthesized wave is about 1.5 mm, however, the amplitude thereof is about ⁇ 2, and particularly, the amplitude is high in a part indicated by an arrow A, so that frequency dispersion may not be suitable.
  • the amplitude of the synthesized wave is about ⁇ 2, however, the oscillation frequency is about 3.5 mm, so that frequency dispersion may not be suitable.
  • the amplitude of the synthesized wave is about ⁇ 2
  • the oscillation frequency is about 0.5 mm, so that sharp peaks or regular peaks do not exist and frequency dispersion may be suitable.
  • the number of stages, the module, and the intermediate gear ratio may be re-set (ST 2 ), assuming one tooth and one turn of each gear 3 each to be the simple harmonic oscillation of a single sine wave, a synthesized wave of the sine waves of the gear 3 is generated (ST 3 ), and it is determined whether the amplitude of the frequency of the synthesized wave is significant over a long period (ST 4 ).
  • the module and the number of teeth of each gear 3 are set so that a frequency at which the oscillations of the gears 3 overlap and are amplified is dispersed in the synthesized wave so as not to allow the amplitude of the frequencies of the synthesized wave to be significant over a long period.
  • the gear disposed on the upstream side in the transport direction of a sheet among the gears 3 in the sheet transport mechanism 1 may be a gear having a period smaller than the period of the sine wave of the gear disposed on the downstream side in the transport direction from the gear. Accordingly, the rotations of the paper feed roller 2 which enable a suitable paper feed speed using the small drive motor having a small driving force and fast driving speed via the gears 3 can be obtained.
  • the sheet transport mechanism 1 may transmit the driving force of the drive motor to the paper feed roller 2 via the gear 3 to rotate the paper feed roller 2 for transporting a sheet in a predetermined transport direction.
  • the printing apparatus may print on the sheet while transporting the sheet using the sheet transport mechanism 1 .
  • each gear 3 of the sheet transport mechanism 1 when the module and the number of teeth of each gear 3 of the sheet transport mechanism 1 are set, one tooth and one turn of each gear 3 are each assumed to be a simple harmonic oscillation of a single sine wave, and the synthesized wave of the sine waves of the gears 3 may be generated. Then, the module and the number of teeth of each gear 3 may be adjusted so that the frequency at which the oscillations of the gears 3 overlap and are amplified may be dispersed in the synthesized wave so as not to allow the amplitude of the frequencies of the synthesized wave to be significant over a long period. Accordingly, when the printing apparatus prints on the sheet while the sheet transport mechanism 1 transports the sheet, errors in engagement of the gears 3 are reduced over a long period, so that a change in paper feed speed can be suppressed.
  • the sheet transport mechanism 1 in which the module and the number of teeth of each gear are set by using the density unevenness reduction method according to this embodiment can reduce errors in engagement of the gears 3 over a long period without significantly improving the precision of the gears 3 , thereby suppressing a change in paper feed speed. Accordingly, the printing apparatus including the sheet transport mechanism 1 can reduce the generation of density unevenness such as jitter without an increase in production costs, thereby obtaining an image with high quality.
  • the embodiment is described by using as the roller used for transporting a sheet, the paper feed roller 2 which is disposed on the upstream side in the transport direction of the sheet from the platen roller.
  • the invention is not limited thereto, and for example, a paper feed roller 2 disposed on the downstream side in the transport direction from the platen roller, or the platen roller for transporting a sheet may also be applied.
  • the paper feed gear 3 a may be fixed to the end portion of the paper feed roller 2 , however, the invention is not limited thereto.
  • the paper feed roller 2 may be a projection roller on which a plurality of projection teeth engaged with the teeth of one of the gears 3 are arranged in parallel with the circumferential direction of the paper feed roller 2 .
  • one tooth and one turn of the paper feed roller 2 are each assumed to be a simple harmonic oscillation of a single sine wave, and the synthesized wave of the sine waves of the gears 3 and the paper feed roller 2 is generated.
  • the size of the paper feed roller 2 and the number of projection teeth may be set so that the frequency at which the oscillation of the gears 3 and the paper feed roller 2 overlap and are amplified is dispersed in the synthesized wave so as to shorten the amplitude of the frequency of the synthesized wave over a long period. Accordingly, errors in engagement of the paper feed roller 2 and the gears 3 are reduced to suppress a change in paper feed speed, so that it is possible to reduce the generation of density unevenness such as jitter in the printing apparatus having the sheet transport mechanism 1 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handling Of Sheets (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US12/636,272 2009-02-02 2009-12-11 Density unevenness reduction method and sheet transport mechanism Abandoned US20100194034A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-021269 2009-02-02
JP2009021269A JP2010173290A (ja) 2009-02-02 2009-02-02 濃度むら低減方法および用紙搬送機構

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US20100194034A1 true US20100194034A1 (en) 2010-08-05

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US12/636,272 Abandoned US20100194034A1 (en) 2009-02-02 2009-12-11 Density unevenness reduction method and sheet transport mechanism

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US (1) US20100194034A1 (ja)
JP (1) JP2010173290A (ja)
CN (1) CN101857153A (ja)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6080199A (en) * 1996-10-02 2000-06-27 Toyota Jidosha Kabushiki Kaisha Gear designing method, gear manufacturing method, and gear manufactured by the same method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6080199A (en) * 1996-10-02 2000-06-27 Toyota Jidosha Kabushiki Kaisha Gear designing method, gear manufacturing method, and gear manufactured by the same method

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JP2010173290A (ja) 2010-08-12
CN101857153A (zh) 2010-10-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALPS ELECTRIC CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MOTOKI, ZENKO;ABE, YOSHIBUMI;REEL/FRAME:023643/0296

Effective date: 20091015

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION