This application claims the benefit of Korean Application No. 2005-99176, filed Oct. 20, 2005, in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference.
1. Field of the Invention
Aspects of the present invention relate to a paper feeding device of an image forming apparatus. More particularly, aspects of the present invention relate to a versatile paper feeding device that can straightly feed papers without skewing when images are printed on various sizes of papers.
2. Description of the Related Art
An image forming apparatus such as a laser printer or a copier comprises a paper feeding device for feeding a print medium such as printing paper (hereinafter, paper) into the image forming apparatus body. The paper feeding device comprises a pick-up roller for picking up an individual sheet of the paper. One image forming apparatus may comprise a plurality of various kinds of feeding devices. Among the feeding devices, a versatile paper feeding device is necessitated to easily print on a small number of sheets of paper without having to open the feeding cassette, or to easily print on various sizes of paper such as an envelope or a small paper.
C to constrain the paper S from moving in a widthwise direction.
However, the conventional versatile paper feeding device 1 has the paper alignment member 23 formed only on the paper support member 22 of the leading end of the paper but has no separate paper alignment member on the paper support expansion member 21 of the following end of the paper. Therefore, as the versatile paper feeding device 1 prints on a paper with a relatively greater size in a lengthwise direction such as letter, A4 or legal size, the following end of the paper S is free to move in arrow direction DE, while the paper S is fed through the pick-up roller 10 to the feeding roller (not shown), such that a skew occurs. When the paper S with a skew is fed to the feeding roller, the image is skewed as much as the paper S is skewed, and further, a jam may occur.
Accordingly, aspects of the present invention are to solve at least the above and/or other problems and to provide advantages including the advantages described below. Therefore, an aspect of the present invention is to provide a versatile paper feeding device in which a following end of a paper is not skewed but straightly fed as an image forming apparatus prints on various sizes of paper so that printing quality can be enhanced.
An aspect of the invention provides a versatile paper feeding device, comprising a pick-up roller, a paper support member disposed under the pick-up roller to stack a paper thereon, a paper support expansion member formed to be capable of freely sliding toward the paper support member to support the paper, a first paper alignment member formed on the paper support member to align a leading end portion of the paper, and a second paper alignment member formed on the paper support expansion member to align a following end portion of the paper.
According to an aspect of the invention, the first paper alignment member may be slidingly formed in a traversing direction against a forwarding direction of the paper on the paper support member so as to align with a width size of the paper fed by the pick-up roller and thereby constrain transverse movement of the paper.
According to an aspect of the invention, the second paper alignment member may be formed to adjust to the width of the paper, where there are at least two different widths of paper to adjust to, to align the following end portion of the paper.
According to an aspect of the present invention, the second paper alignment member may comprise a supporting shaft detachably formed on the paper support expansion member, a pair of first protrusions each formed adjacent to an opposite end of the supporting shaft to adjust to the width of the paper, and a pair of second protrusions each formed adjacent to an opposite end of the supporting shaft and distanced from the pair of the first protrusions by a certain angle to adjust to a width of another paper.
According to an aspect of the present invention, the supporting shaft may comprise a stopper to stop the supporting shaft in a stable position when the supporting shaft is rotated by a certain angle.
According to an aspect of the present invention, the pair of the first protrusions and the pair of the second protrusions may be integrally formed with the supporting shaft. In an embodiment, the pair of the first protrusions and the pair of the second protrusions may be formed to be distanced from each other by about 90 degrees. The supporting shaft may be formed at a receiving part of the paper support expansion member so as to smoothly rotate with the first and the second protrusions.
According to another aspect of the present invention, the paper support expansion member may further comprise slits to receive the first and the second protrusions of the second paper alignment member.
According to another aspect of the present invention, the paper support member has a following end portion that is downwardly extended so that a certain space can be obtained within a boundary surface contacting the paper support expansion member.
According to an aspect of the invention, as the paper support expansion member is slid outward from the paper support member, the first and the second protrusions of the second paper alignment member collide with the following end portion of the paper support member so as to rotate in a forward or a backward direction and pass.
According to another aspect of the present invention, the second paper alignment member may comprise a supporting shaft detachably formed on the paper support expansion member, a pair of first protrusions formed adjacent to opposite ends of the supporting shaft to adjust to the width of a first size of paper, a pair of second protrusions formed to be distanced from the pair of the first protrusions by a certain angle to adjust to a width of a second size of paper, and a pair of third protrusions formed to be distanced from the second protrusions by a certain angle so as to adjust to a width of a third size of paper. According to an aspect of the invention, the paper support expansion member further comprises slits to receive the first, the second and the third protrusions of the second paper alignment member.
Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
Referring to E in
The versatile paper feeding device 100 comprises a pick-up roller 110 engaged with a rotative shaft 112, a paper support member 122 to stack the paper S thereon, a paper support expansion member 121, and paper alignment members 123 and 130 to align the paper S.
The pick-up roller 110 is engaged with the rotative shaft 112 to be rotated together by a driving source (not shown).
The paper support member 122 is disposed under the pick-up roller 110 to stack the paper S thereon so that the pick-up roller 110 can feed an individual sheet of the paper S into an image forming apparatus. The paper support member 122 may be generally formed on a side cover frame 140 of the image forming apparatus.
The paper support expansion member 121 is formed on the side cover frame 140 so as to freely slide toward the paper support member 122 and to support a large size of a paper. The paper support expansion member 122 has a following end portion 122e that is downwardly extended so that a certain space H (refer to
The paper support member 122 and the paper support expansion member 121 of the versatile paper feeding device according to an embodiment of the present invention include the paper alignment members 123 and 130, respectively.
The first paper alignment member 123 is formed on the paper support member 122 to align the leading end portion of the paper S. The first paper alignment member 123 is slidingly formed in a traverse direction to a paper feeding direction of the paper S on the paper support member 122 so as to align with the width size of the paper S fed by the pick-up roller 110 and constrain the transverse movement thereof.
The second paper alignment member 130, which is not included in the conventional versatile paper feeding device, is detachably formed on the paper support expansion member 121. The second paper alignment member 130 is formed near the following end portion of the paper S to align the following end portion of the paper S. The second paper alignment member 130 is formed to adjust to the width of the paper, where the second paper alignment member 130 can adjust to at least two different paper widths, and align the following end portion of the paper.
Referring to
The supporting shaft 133 is cylindrical and has supporting protrusions 133a, 133b formed on each end portion. The supporting shaft 133 is formed at the receiving part 121a of the paper support expansion member 121. The supporting shaft 133 may be momentarily elastically bent by force so that the supporting protrusions 133a, 133b are inserted into or separated from a supporting groove 121c of the receiving part 121a. Therefore, the supporting shaft 133 can be detached from and attached to the paper support expansion member 121 by snapping out of and in place, respectively. As attached to the paper support expansion member 121, the supporting shaft 133 can be rotated. In the central portion of the supporting shaft 133, a stopper 133d, which is non-circular, may be formed. The receiving part 121a in the central portion of the paper support expansion member 121 is formed to be narrow 121b so that the stopper 133d can be inserted therein. The supporting shaft 133 can thus be located in a regular position by the stopper 133d, and therefore, the protrusions 131a, 131b, 132a, and 132b of the supporting shaft 133 can also be located in corresponding regular positions.
The paper support expansion member 121 is made of elastically deformable material such as plastic or metal so that rounded edges of the stopper 133d can slightly push the inner wall of the paper support expansion member 121 as the stopper 133d of the central portion of the paper support expansion member 121 is rotated. Accordingly, the stopper 133d can stop the second paper alignment member 130 in a stable position after the second paper alignment member 130 is rotated by a certain angle. As shown in
Each protrusion 131a, 131b of the first pair is formed adjacent to each respective end of the supporting shaft 133 to adjust to the width of the paper S. The protrusions 132a, 132b of the second pair may each be formed at a certain distance and angle from each respective protrusion 131a, 131b of the first pair, to adjust to the width of another size of paper. The first pair of protrusions 131a, 131b and the second pair of protrusions 132a, 132b may be integrally formed with the supporting shaft 133. According to an embodiment, the first pair of protrusions and the second pair of protrusions may be formed from each other by an angle of about 90 degrees.
The protrusions 131a, 131b, are formed to adjust to the width of a relatively large size of paper such as A4 and similarly, the protrusions 132a, 132b may be formed to adjust to the width of letter size. However, this should not be considered as limiting. At least one of the pair of protrusions may be formed to adjust to the width of a smaller size of paper as necessary. Although not shown, according to another embodiment, a third pair of protrusions, in addition to the two pairs of protrusions 131a, 131b, and 132a, 132b, may be further formed to adjust to the width of a third size of paper. For example, the pair of third protrusions may be formed on the supporting shaft 133 at an appropriate distance and at an appropriate angle from the two pairs of protrusions 131a, 131b, and 132a, 132b, for example, by approximately 90 degrees and 180 degrees from the second and first pairs, respectively, so as to adjust to the width of another size of paper. The pairs of protrusions can be straight parallel protrusions according to an embodiment of the invention, however, the protrusions need not be. That is, the protrusions may be set at an angle to the supporting shaft 133 or the individual protrusion may have a bend to strengthen the protrusion, facilitate paper alignment and/or facilitate the rotation of the supporting shaft 133.
The paper support expansion member 121 includes slits 126a, 126b, 127a, 127b corresponding to the protrusions so as to receive the protrusions 131a, 131b, 132a, 132b of the second paper alignment member 130. If a plurality of pairs of protrusions are formed, the paper support expansion member 121 needs to include a corresponding plurality of pairs of slits to receive the plurality of pairs of protrusions.
The operations of the versatile paper feeding device according to an embodiment of the present invention will be explained hereinafter with reference to accompanying drawings.
When image printing is not desired, the versatile paper feeding device 100 is pushed into the image forming apparatus body, the paper support expansion member 121 is slid in a paper forwarding direction, i.e., the direction A, so that one of the pairs of protrusions 131a, 131b and 132a, 132b of the second paper alignment member 130 collide with the following end portion 122e of the paper support member 122, rotate and smoothly pass. For example, the second pair of protrusions 132a, 132b retreat into the slits 127a, 127b and the first pair of protrusions 131a, 131b rotate up in the space H as shown in
When the paper support expansion member 121 is positioned as in
As the certain size of paper is stacked and print signals are received from a central control part (not shown) to print an image, the rotative shaft 112 is rotated and the pick-up roller 110, coaxially formed with the rotative shaft 112, is also rotated. The paper S is moved in direction A of
The versatile paper feeding device 100 according to an embodiment of the present invention, further includes the second paper alignment member besides the first paper alignment member so that the paper is straightly fed to the feeding roller and not skewed when an image is printed. Therefore, the side skew can be prevented, an even side margin can be achieved and the quality of paper feeding can be enhanced.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
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