Source: http://www.google.com/patents/US7410167?dq=6,332,126
Timestamp: 2017-12-16 06:24:30
Document Index: 139777598

Matched Legal Cases: ['art 60', 'art 60', 'art 60', 'art 60', 'art 60', 'art 60', 'art 60']

Patent US7410167 - Recording medium feeding method and image recording apparatus - Google Patents
A method for feeding a recording medium includes the steps of: feeding the recording medium along a sheet-feeding path by a unit feeding amount, detecting an entrance of a rear end of the recording medium into a jumping alarm area, dividing the unit feeding amount into minute divisional feeding amounts...http://www.google.com/patents/US7410167?utm_source=gb-gplus-sharePatent US7410167 - Recording medium feeding method and image recording apparatus
Publication number US7410167 B2
Application number US 11/275,191
Also published as CN1796145A, CN100471682C, US20070003352
Publication number 11275191, 275191, US 7410167 B2, US 7410167B2, US-B2-7410167, US7410167 B2, US7410167B2
Inventors Yuji Koga, Masatoshi Izuchi, Tetsuya Ouchi, Shohei Koide
Recording medium feeding method and image recording apparatus
US 7410167 B2
15. The image recording apparatus according to claim 14, wherein the rotation sensor comprises an encoder for detecting an excessive rotation of the roller generated by the jumping phenomenon.
Moreover, in the driving roller 42, the sheet feeding encoder 65 is installed to detect the revolution of the driving roller 42. The sheet feeding encoder 65 includes an encoder wheel 65 a in which radial-shaped marks are engraved into a transparent disc at regular pitches, and an optical sensor 65 b for detecting the marks of the encoder wheel 65 a. The encoder wheel 65 a, as shown in the drawing, is fixed to the shaft of the driving roller 42 to rotate together with the driving roller 42 such that the light from the optical sensor 65 b is intercepted by the marks of the encoder wheel 65 a. The marks pass through the optical axis of light emitted from the optical sensor 65 b, and rotate together with the driving roller 42, so that the revolution of the driving roller 42 can be detected by the count number of the marks of the encoder wheel 65 b.
Hereinafter, the method, in which the central processing part 60 receives the signals from the sheet feeding encoder 65 and the registration sensor 67, and controls the inkjet recording head 40, the driving roller 42, and the sheet discharge roller 55 to feed the recording sheets P, will be described. When the leading end of the recording sheet P fed to the feeding path 23 from the sheet supply tray 20 by the sheet supply roller 25 reaches the position where the registration sensor 67 is installed, the central processing part 60 determines that the recording sheet P has reached the position P1 based on the signal from the registration sensor 67. After that, the central processing part 60 counts the number of steps of the motor for rotating the sheet supply roller 25. According to the count number, the central processing part 60 determines that the leading end of the recording sheet P has reached the position P2 where the leading end of the recording sheet P is in contact with the driving roller 42 and the pressing roller 43. Meanwhile, at that time, the driving roller 42 rotates in the reverse feeding direction. After that, the central processing part 60 rotates the driving roller 42 in the forward feeding direction after counting a predetermined count number. Due to the time lag corresponding to the count number, the leading end of the recording sheet P is brought into contact with the roller surface of the driving roller 42 and is bent so that the oblique feeding of the recording sheet P is corrected. After that, the driving roller 42 rotates so that the recording sheet P is nipped by the driving roller 42 and the pressing roller 43 and is fed onto the platen 41.
When the resolution of the sub-scanning direction is 1200 dpi or 2400 dpi, the central processing part 60 feeds the recording sheet P by the minute divisional feeding, and determines a method for compensating the jumping phenomenon of the recording sheet P according to the size of the recording sheet P (S6). Specifically, the central processing part 60 compensates using a compensation amount table (S7 and S8) when the size of the recording sheet P is 2L size (127 mm×178 mm) or less, and performs the compensation corresponding to the jumping amount when the size of the recording sheet P is larger than 2L size, for example, B5 size or A4 size (S9). A size determining device for determining the size of the recording sheet P, for example, when printing the image data transmitted from the computer 69, is implemented by the printer driver installed in the computer 69, and the size of the recording sheet P is transmitted from the computer 69 to the multi function device 1 together with the image data. Moreover, a size sensor installed in the sheet supply tray 20 or in the feeding path 23 may be utilized as the size determining device so that the size of the recording sheet P can be obtained from the output value from the size sensor. The reason why the feeding method is changed according to the size of the recording sheet P is that when the size of the recording sheet P is small, the urging force applied to the recording sheet P by the pressing roller 43 is also small so that it is difficult to precisely detect the jumping phenomenon of the recording sheet P. Thus, the selection of the feeding method according to the size of the recording sheet P is determined based on the limitation of detecting the jumping phenomenon of the recording sheet P. Meanwhile, since the urging force applied to the recording sheet P by the pressing roller 43 is varied according to the width of the recording sheet P, the determination of the compensating method according to the size of the recording sheet P as described above is not necessarily be made by the length direction size and the width direction size of the recording sheet P, and can be made only by the width of the recording sheet P. Thus, any size determining device, which detects the width of the recording sheet P, such as the above-described size sensor is acceptable.
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U.S. Classification 271/266, 400/636, 271/270, 400/706, 271/265.01, 400/579, 400/637, 400/637.1, 400/645, 400/578
Cooperative Classification B41J11/0095, B41J13/0027, B41J13/03
European Classification B41J13/03, B41J13/00C2, B41J11/00W
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOGA, YUJI;IZUCHI, MASATOSHI;OUCHI, TETSUYA;AND OTHERS;REEL/FRAME:017310/0708;SIGNING DATES FROM 20060227 TO 20060228