(12) United States Patent

US006400917B2
(12) United States Patent
Nakazato et al.
(54) IMAGE FORMING APPARATUS FOR
(10) Patent N0.:
(45) Date of Patent:
(58)
399/112, 118, 107, 126, 178, 179, 177;
347/138, 152, 245, 263, 232, 257
(56)
References Cited
(75) Inventors: Yasushi Nakazato; Kazuyuki
U.S. PATENT DOCUMENTS
Shimada; Tomohiro Nakajima, all of
Tokyo (JP)
(73) Assignee: Ricoh Company, Ltd., Tokyo (JP)
Notice:
Subject to any disclaimer, the term of this
patent is extended or adjusted under 35
5,208,640 A *
5,752,137 A *
5/1993 Horie et al.
5/1998 Haneda
7/1998
5,787,324 A
*
5,848,329 A
* 12/1998 Aoyama et al. ...... .. 399/111 X
5,907,749 A
*
5,953,559 A *
6,191,801 B1 *
U.S.C. 154(b) by 0 days.
6,249,305 B1 *
IWasaki .................... .. 399/112
5/1999 Nomura et al.
9/1999
2/2001
6/2001
Obu ......................... .. 399/110
Hiraoka et al. ........... .. 347/232
Miyamoto et al. ........ .. 347/232
(21) Appl. No.: 09/805,246
* cited by examiner
(22) Filed:
Primary Examiner—Susan S. Y. Lee
Mar. 14, 2001
Jun. 4, 2002
Field of Search ............................... .. 399/110, 111,
REDUCING BANDING CAUSED BY
VIBRATION OF STACKED IMAGE
FORMING CARTRIDGES
(*)
US 6,400,917 B2
(74) Attorney, Agent, or Firm—Oblon, Spivak, McClelland,
Related US. Application Data
(62)
Division of application No. 09/305,275, ?led on May 5,
1999, now Pat. NO. 6,236,820.
(30)
Foreign Application Priority Data
Maier & Neustadt, PC.
(57)
ABSTRACT
An image forming apparatus including a plurality of image
forming cartridges removably mounted to an apparatus body
one above the other is disclosed. Structural members each
May 7, 1998
May 12, 1998
Apr. 7, 1999
(JP) ......................................... .. 10-124640
(JP) .... ..
10-128728
(JP) ......................................... .. 11-099724
(51)
Int. Cl.7 .............................................. .. G03G 21/16
(52)
US. Cl. ..................... .. 399/111; 347/232; 347/257;
399/110; 399/112
226m
partition off a space betWeen nearby image forming car
tridges mounted to the apparatus body. The apparatus is
capable of obviating banding ascribable to the vibration of
the cartridges.
18 Claims, 36 Drawing Sheets
U.S. Patent
Jun. 4, 2002
Sheet 7 0f 36
US 6,400,917 B2
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US 6,400,917 B2
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Jun. 4, 2002
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US 6,400,917 B2
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U.S. Patent
Jun. 4, 2002
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U.S. Patent
Jun. 4, 2002
Sheet 16 0f 36
US 6,400,917 B2
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U.S. Patent
Jun. 4, 2002
Sheet 17 0f 36
US 6,400,917 B2
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Jun. 4, 2002
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U.S. Patent
Jun. 4, 2002
Sheet 19 0f 36
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