U.S. patent application number 11/675744 was filed with the patent office on 2008-08-21 for paper feeding device.
This patent application is currently assigned to FOXLINK IMAGE TECHNOLOGY CO., LTD.. Invention is credited to Yueh-Shing Lee, Kuo-Kuang Wu.
Application Number | 20080197560 11/675744 |
Document ID | / |
Family ID | 39705974 |
Filed Date | 2008-08-21 |
United States Patent
Application |
20080197560 |
Kind Code |
A1 |
Lee; Yueh-Shing ; et
al. |
August 21, 2008 |
Paper Feeding Device
Abstract
A paper feeding device comprises a cover, a roller frame and at
least one paper blocking unit. The roller frame has two side walls.
The paper blocking unit is placed beside the side wall, having a
projection mounted on the side wall of the roller frame and a paper
blocking element including a connecting portion, the connecting
portion has a positioning pillar rotatablely connected to the
cover. The connecting portion extends downwards to form a stopping
portion, the stopping portion further extends downwards to form a
paper blocking arm, the lower portion of the paper blocking arm
defines an opening communicating one side of the paper blocking arm
near the side wall. The projection can stops at the stopping
portion and passes through the opening of the paper blocking
element to allow the document to be fed in, so the cooperation is
easy, the paper feeding device works smoothly.
Inventors: |
Lee; Yueh-Shing; (Hsinchu,
TW) ; Wu; Kuo-Kuang; (Hsinchu, TW) |
Correspondence
Address: |
WPAT, PC;INTELLECTUAL PROPERTY ATTORNEYS
2030 MAIN STREET, SUITE 1300
IRVINE
CA
92614
US
|
Assignee: |
FOXLINK IMAGE TECHNOLOGY CO.,
LTD.
Hsinchu
TW
|
Family ID: |
39705974 |
Appl. No.: |
11/675744 |
Filed: |
February 16, 2007 |
Current U.S.
Class: |
271/121 |
Current CPC
Class: |
B65H 2402/64 20130101;
B65H 3/0684 20130101; B65H 3/34 20130101; B65H 2301/4222 20130101;
B65H 2405/1134 20130101 |
Class at
Publication: |
271/121 |
International
Class: |
B65H 3/46 20060101
B65H003/46 |
Claims
1. A paper feeding device, comprising: a cover, a pair of retaining
portions mounted on an inner surface of the cover; a pickup roller
assembly picking up and then transferring papers into the paper
feeding device; at least one paper blocking unit placed beside the
pickup roller assembly, having a paper blocking element including a
connecting portion, the connecting portion having a positioning
pillar rotatablely connected to the retaining portion of the cover,
the connecting portion extending downwards to form a stopping
portion, the stopping portion extending downwards to form a paper
blocking arm, the paper blocking arm defining an opening
communicating one side of the paper blocking arm near the pickup
roller assembly; and a projection mounted on the pickup roller
assembly, wherein the projection can stops at the stopping portion
of the paper blocking arm and passes through the opening of the
paper blocking arm.
2. The paper feeding device as claimed in claim 1, wherein a
retaining hole is opened in the retaining portion of the cover, the
positioning pillar of the paper blocking element is connected to
the retaining hole.
3. The paper feeding device as claimed in claim 1, further
comprising a picking roller and a conveying roller located between
the two side walls of the roller frame.
4. The paper feeding device as claimed in claim 3, wherein the
conveying roller is mounted around an active shaft, the active
shaft passes through the two side walls of the roller frame.
5. The paper feeding device as claimed in claim 4, wherein a pair
of connecting portions are mounted on the inner surface of the
cover below the retaining portion, and a receiving space is formed
between the two connecting portions for receiving the roller frame
with the two ends of the active shaft connected to the connecting
portions.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a paper feeding device, and
more particularly to a paper feeding device having paper blocking
unit applied in an office business machine.
[0003] 2. The Related Art
[0004] Recent business machines, such as a scanner, a printer, a
copier, etc., are broadly required in the office operation. The
business machine has a function of image disposing. Take a
conventional scanner as an example, an image disposing system of
the scanner includes a glass plate, an optical system arranged
under the glass plate for reading the image of the document placed
on the glass plate. As a result of the application of the ADF
(automatic document feeder), a stack of documents are place in a
document tray of the ADF, then the documents are fed into the
scanner one by one and placed on the glass plate by a paper feeding
device of the ADF, at last, the optical system reads the image of
the document.
[0005] In the conventional scanner, the paper feeding device
further comprises a paper blocking unit, which is used to make sure
that the document is placed in a proper position before being
picked by the paper feeding device, thereby, the document is picked
by a picking roller of the paper feeding device.
[0006] Please refer to FIGS. 1-2, a conventional paper feeding
device having paper blocking unit 1' includes a conveying roller
10', a picking roller 20', a blocking unit 30' and a blocking arm
40'. The conveying roller 10' and the picking roller 20' are
parallel to each other and located in a roller frame 50', the
blocking unit 30' sleeves on the shaft of the picking roller 20'.
The blocking arm 40' is located on the roller frame 50'. Before the
document being picked, a blocking projection 41' of the blocking
arm 40' leans against a stopping projection 31' of the blocking
unit 30', the documents 2' are stopped outside, the picking roller
10' keeps a certain distance from the documents 2'. Then referring
to FIG. 2, when the document 2' is to be picked, the roller frame
50' drives the picking roller 10' to move downwards, the blocking
arm 40' rotates and the blocking projection 41' impels the stopping
projection 31' of the blocking unit 30' to move upwards, as a
result, the blocking arm 40' loses the cooperation with the
blocking unit 30', then the documents 2' are not stopped by the
blocking arm 40', at the same time, the picking roller 10' contacts
with the documents 2' and the document 2s' are fed into the scanner
one by one via the paper feeding device 1'.
[0007] As described above, the blocking projection 41' impels the
stopping projection 31' of the blocking unit 30' to move upwards,
thereby, the blocking arm 40' loses the cooperation with the
blocking unit 30', then the documents 2' are not stopped by the
blocking arm 40' and fed into the scanner one by one. However, the
cooperation between the blocking arm 40' and the blocking unit 30'
is liable to be lost, then the blocking projection 41' isn't able
to impel the stopping projection 31' to move, consequently, the
document 2' isn't able to be fed into the paper feeding device 1',
the paper feeding device 1' can not work smoothly.
SUMMARY OF THE INVENTION
[0008] Accordingly, an object of the present invention is to
provide a paper feeding device, comprising a cover, a pickup roller
assembly and at least one paper blocking unit. The retaining
portions are mounted on an inner surface of the cover. The pickup
roller assembly picks up and then transfers papers into the paper
feeding device. The paper blocking unit is placed beside the pickup
roller assembly, having a paper blocking element and a projection
mounted on the pickup roller assembly. The paper blocking element
includes a connecting portion, the connecting portion has a
positioning pillar rotatablely connected to the retaining portion
of the cover, the connecting portion extends downwards to form a
stopping portion, the stopping portion extends downwards to form a
paper blocking arm, the paper blocking arm defines an opening
communicating one side of the paper blocking arm near the pickup
roller assembly. The projection can stops at the stopping portion
of the paper blocking arm and passes through the opening of the
paper blocking arm.
[0009] As described above, the paper feeding device stops the
documents by the cooperation between the paper blocking element and
the projection, when to feed documents, the projection passes
through the opening of the blocking element to allow the document
to be fed in, so the cooperation is easy, the paper feeding device
works successfully.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present invention will be apparent to those skilled in
the art by reading the following description of a preferred
embodiment thereof, with reference to the attached drawings, in
which:
[0011] FIGS. 1-2 show a conventional paper feeding device;
[0012] FIG. 3 is an exploded perspective view of a paper feeding
device having paper blocking unit of the present invention;
[0013] FIG. 4 is a partial enlarged view of the encircled portion
labeled IV shown in FIG. 3;
[0014] FIG. 5 is a perspective view of a pickup roller
assembly;
[0015] FIG. 6 is a perspective view of a paper blocking element
shown in FIG. 3; and
[0016] FIGS. 7-9 are side cross-sectional views for describing
operations of the paper feeding device of the present
invention.
[0017] Please refer to FIG. 3, the paper feeding device of the
present invention includes a cover 10, a pickup roller assembly 20,
a base 40 and a paper blocking unit 30.
[0018] Then please refer to FIG. 4 in combination with FIG. 3, a
pair of plate-shaped retaining portion 11 projecting from the inner
surface of the cover 10 and are parallel to each other, a
restricting projection 12 is formed therebetween, a retaining hole
111 is opened in the retaining portion 11. Below the retaining
portion 11, a pair of connecting portions 13 is mounted on the
inner surface of the cover 10, and a receiving space 14 is formed
therebetween.
[0019] Referring to FIG. 5, the pickup roller assembly 20 includes
a roller frame 21, a belt 22, a picking roller 23 and a conveying
roller 24. The roller frame 21 has a left side wall 211 and a right
side wall 212, an active shaft 214 and an idle shaft 213 are
parallel located between the left side wall 211 and the right side
wall 212, a conveying roller 24 is mounted around the active shaft
214 and a picking roller 23 is mounted around the idle shaft 213. A
belt 22 is sleeved on both the conveying roller 24 and the picking
roller 23, and impels the conveying roller 24 and the picking
roller 23 to press against the roller frame 21.
[0020] Please refer to FIG. 3 and FIG. 6, the paper blocking unit
30 includes a paper blocking element 31 and a projection 32. The
paper blocking element 31 has a connecting portion 311, two
opposite sides of the connecting portion 311 project to form a
positioning pillar 312 respectively. A front end of the connecting
portion 311 extends upward to form a restricting arm 313, the
restricting arm 313 leans against the restricting projection 12 of
the cover 10. The back end of the connecting portion 311 extends
downwards and forms a stopping portion 315, the stopping portion
315 further extends downwards to form a paper blocking arm 314, the
lower portion of the paper blocking arm 314 defines an opening 316
communicating the bottom and the right side of the paper blocking
arm 314. The projection 32 is mounted on the left side wall 211 of
the pickup roller assembly 20.
[0021] Please refer to FIGS. 3-6, the assemblage of the paper
feeding device 1 of the present invention is described in detail
hereinafter. Firstly, the belt 22 is sleeved on both the picking
roller 23 and the conveying roller 24, the active shaft 214 and the
idle shaft 213 are located in the roller frame 21 between the left
side wall 211 and the right side wall 212, the pickup roller
assembly 20 is assembled. Then the active shaft 214 is rotatablely
connected to the connecting portion 13 of the cover 10 and the
pickup roller assembly 20 is received in the receiving space 14
therein. Secondly, the paper blocking unit 30 is placed beside the
pickup roller assembly 20, in this embodiment, the paper blocking
unit 30 is placed at the left side of the pickup roller assembly
20, the positioning pillar 312 of the paper blocking element 31 is
rotatablely connected to the retaining hole 111 of the cover 10,
the projection 32 stops at the stopping portion 315 of the paper
blocking element 31. Lastly, the cover 10 covers on the base 40,
then the paper feeding device 1 of the present invention is
assembled.
[0022] As shown in FIG. 7, when the paper feeding device 1 is in
natural state, the picking roller 23 keeps a certain distance from
the document 2, the documents 2 are stopped outside by the paper
blocking arm 314, the projection 32 stops at the stopping portion
315 of the paper blocking element 31, the restricting arm 313 is
stopped at the restricting projection 12.
[0023] Please refer to FIGS. 8-9, when the paper feeding device 1
picks up the document 2, a motor (not shown) drives the active
shaft 214 to rotate clockwise, so the conveying roller 24 mounted
on the active shaft 214 rotates, a friction created between the
conveying roller 24 and the belt 22 drives the belt 22 to move
along with the conveying roller 24, then a friction created between
the belt 22 and the picking roller 23 drives the picking roller 23
to rotate clockwise. As the picking roller 23 and the conveying
roller 24 both press against the roller frame 21, when the picking
roller 23 and the conveying roller 24 rotate clockwise, a friction
created between them and the roller frame 21 drives the pickup
roller assembly 20 to rotate clockwise around the active shaft 214,
then the picking roller 23 contacts with the document 2. Meanwhile,
as the pickup roller assembly 20 moves downwards, the projection 32
mounted on the left side wall 211 of the roller frame 21 also moves
downwards and passes through the opening 316 of the paper blocking
element 31, so the projection 32 loses the cooperation with the
stopping portion 315 of the paper blocking arm 314, the blocking
arm 314 rotates clockwise around the positioning pillar 312 and is
no longer stop the documents 2. Then as the belt 22 contacts with
the document 2 and rotates clockwise, the friction created
therebetween picked the document 2 into the paper feeding device
1.
[0024] On the contrary, when the paper feeding device 1 stops to
pick documents 2, the motor (not shown) instantly rotates reversely
and therefore drives the active shaft 214 to rotate anti-clockwise,
then the conveying roller 24 and the picking roller 23 both rotate
anti-clockwise. As the picking roller 23 and the conveying roller
24 both press against the roller frame 21, then a friction created
between them and the roller frame 21 drives the pickup roller
assembly 20 to rotate anti-clockwise around the active shaft 214
and move upwards, so the picking roller 23 departs from the
documents 2, the paper blocking arm 314 rotates anti-clockwise
around the positioning pillar 312 under its own weight, meanwhile,
the projection 32 mounted on the roller frame 21 passes through the
opening 316 (shown in FIG. 6) of the paper blocking arm 314 and
stops at the stopping portion 315, the restricting arm 313 stops at
the restricting projection 12 of the roller frame 21, then the
picking roller 23 and the conveying roller 24 stop to rotate, as
shown in FIG. 8, the paper feeding device 1 is in natural state,
the documents 2 are stopped outside by the paper blocking arm
314.
[0025] As described above, the paper feeding device 1 stops the
documents 2 by the cooperation between the paper blocking element
31 and the projection 32, when to feed documents 2, the projection
32 passes through the opening 316 of the blocking element 31 to
allow the document 2 to be fed in, so the cooperation is easy, the
paper feeding device 1 works smoothly.
[0026] The foregoing description of the present invention has been
presented for purposes of illustration and description. It is not
intended to be exhaustive or to limit the invention to the precise
form disclosed, and obviously many modifications and variations are
possible in light of the above teaching. Such modifications and
variations that may be apparent to those skilled in the art are
intended to be included within the scope of this invention as
defined by the accompanying claims.
* * * * *