| US 7,545,400 B2 | ||
| Image forming apparatus and method of controlling top margin of printing medium in image forming apparatus | ||
| Byung-sun Ahn, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., Suwom-Si (Korea, Republic of) | ||
| Filed on Nov. 01, 2005, as Appl. No. 11/262,709. | ||
| Claims priority of application No. 10-2004-0088565 (KR), filed on Nov. 03, 2004. | ||
| Prior Publication US 2006/0092265 A1, May 04, 2006 | ||
| Int. Cl. B65H 5/06 (2006.01); B41J 13/00 (2006.01) | ||
| U.S. Cl. 347—139 [347/104; 347/218; 347/264] | 22 Claims |
| 1. An image forming apparatus comprising:
a feeding roller;
a feeding motor to drive the feeding roller to move a picked-up printing medium; and
a controller to control the feeding motor so as to regulate a feeding velocity of the printing medium according to a feeding
time T12 taken to move the printing medium within a predetermined section of a printing medium feeding path,
wherein the controller drives the feeding motor at a predetermined motor driving frequency P within the predetermined section;
varies the predetermined feeding motor driving frequency P, according to the feeding time T12 taken to move the printing medium within the predetermined section, in a post section after the predetermined section; and
restores the predetermined motor driving frequency P at a reference time after beginning to vary the driving frequency of
the feeding motor.
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