U.S. patent application number 15/414796 was filed with the patent office on 2018-07-26 for paper feeding device and paper feeding method applied thereto.
The applicant listed for this patent is Foxlink Image Technology Co., Ltd.. Invention is credited to Yung Kai Chen, You-Chung Chou, Kuan Cheng Huang.
Application Number | 20180208421 15/414796 |
Document ID | / |
Family ID | 62905655 |
Filed Date | 2018-07-26 |
United States Patent
Application |
20180208421 |
Kind Code |
A1 |
Chou; You-Chung ; et
al. |
July 26, 2018 |
PAPER FEEDING DEVICE AND PAPER FEEDING METHOD APPLIED THERETO
Abstract
A paper feeding device includes a motor, a pickup roller
assembly, a velocity sensor and a feeding roller assembly. The
pickup roller assembly is driven by the motor for picking up the
papers. The velocity sensor is mounted to the pickup roller
assembly for detecting rotating speeds of the pickup roller
assembly so as to detect speeds of feeding forward the papers. The
feeding roller assembly is driven by the motor for continuing
feeding forward the papers. A speed discrepancy will be generated
between the rotating speed of the pickup roller assembly after the
one of the papers is fed to the feeding roller assembly and the
rotating speed of the pickup roller assembly which just picks up
the one of the papers, when the speed discrepancy reaches a preset
value set by the scanner, the scanner is triggered to start
scanning.
Inventors: |
Chou; You-Chung; (New Taipei
City, TW) ; Huang; Kuan Cheng; (New Taipei City,
TW) ; Chen; Yung Kai; (New Taipei City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Foxlink Image Technology Co., Ltd. |
New Taipei City |
|
TW |
|
|
Family ID: |
62905655 |
Appl. No.: |
15/414796 |
Filed: |
January 25, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B65H 7/14 20130101; B65H
2553/82 20130101; B65H 3/06 20130101; B65H 7/20 20130101; B65H
2801/39 20130101; B65H 2553/51 20130101; B65H 2513/10 20130101;
B65H 2513/514 20130101; B65H 2511/33 20130101; B65H 5/062 20130101;
B65H 2511/33 20130101; B65H 2220/01 20130101; B65H 2513/10
20130101; B65H 2220/03 20130101; B65H 2513/514 20130101; B65H
2220/02 20130101 |
International
Class: |
B65H 7/20 20060101
B65H007/20; B65H 7/14 20060101 B65H007/14; B65H 3/06 20060101
B65H003/06; B65H 5/06 20060101 B65H005/06 |
Claims
1. A paper feeding device mounted in a scanner for feeding papers,
the paper feeding device comprising: a motor; a pickup roller
assembly connected with and driven by the motor for picking up the
papers and transmitting the papers to the feeding roller assembly;
a velocity sensor mounted to the pickup roller assembly for
detecting rotating speeds of the pickup roller assembly so as to
detect speeds of feeding forward the papers, the rotating speed of
the pickup roller assembly being detected by virtue of counting
pulses outputted by the velocity sensor; and a feeding roller
assembly connected with and driven by the motor, and located in
front of the pickup roller assembly for continuing feeding forward
the papers; wherein a rotating speed of the feeding roller assembly
is faster than the rotating speed of the pickup roller assembly,
after one of the papers is fed to the feeding roller assembly, the
feeding roller assembly drives the one of the papers to be fed
acceleratedly, at the moment, the pickup roller assembly rotates
acceleratedly on account of being dragged by the one of the papers,
a speed discrepancy will be generated between the rotating speed of
the pickup roller assembly after the one of the papers is fed to
the feeding roller assembly and the rotating speed of the pickup
roller assembly which just picks up the one of the papers, and when
the speed discrepancy reaches a preset value set by the scanner,
the scanner is triggered to start scanning.
2. The paper feeding device as claimed in claim 1, wherein the
pickup roller assembly includes a pickup shaft, a pickup roller
pivotally mounted around one end of the pickup shaft, and the
velocity sensor is mounted to the pickup shaft.
3. The paper feeding device as claimed in claim 2, wherein the
velocity sensor is an optical rotary encoder.
4. The paper feeding device as claimed in claim 3, wherein the
optical rotary encoder includes a light source, a coded disc and a
light receiver, the coded disc is fastened to the pickup shaft, the
coded disc is disposed between the light source and the light
receiver, and when the motor drives the pickup roller assembly to
rotate to pick up the papers, the pickup shaft and the coded disc
rotate together at the same speed, but the light source and the
light receiver do not rotate with the pickup shaft.
5. The paper feeding device as claimed in claim 4, wherein the
light source is turned on, the coded disc opens a plurality of
equidistant openings arranged as a ring shape, and the light
receiver receives light beams penetrating through the openings at
the time of the pickup shaft and the coded disc rotating
together.
6. A paper feeding method applied to a paper feeding device which
is mounted in a scanner for feeding papers, the paper feeding
device including a motor, a pickup roller assembly connected with
the motor, a velocity sensor mounted to the pickup roller assembly,
and a feeding roller assembly connected with the motor, the paper
feeding method comprising steps of: the motor driving the pickup
roller assembly to rotate to pick up the papers and transmit the
papers to the feeding roller assembly; the velocity sensor
detecting rotating speeds of the pickup roller assembly by virtue
of counting pulses outputted by the velocity sensor so as to detect
speeds of feeding forward the papers; the motor driving the feeding
roller assembly to rotate for continuing feeding forward the papers
transmitted by the pickup roller assembly to a scan passageway of
the scanner; and getting a speed discrepancy between the rotating
speed of the pickup roller assembly after the one of the papers is
fed to the feeding roller assembly and the rotating speed of the
pickup roller assembly which just picks up the one of the papers;
wherein the rotating speed of the feeding roller assembly is faster
than the rotating speed of the pickup roller assembly, after one of
the papers is fed to the feeding roller assembly, the feeding
roller assembly drives the one of the papers to be fed
acceleratedly, at the moment, the pickup roller assembly rotates
acceleratedly on account of being dragged by the one of the papers,
and when the speed discrepancy reaches a preset value set by the
scanner, the scanner is triggered to start scanning.
7. The paper feeding method as claimed in claim 6, further
comprising a step of modulating a scan scaling of the scanner
according to the speeds of feeding forward the papers.
8. The paper feeding method as claimed in claim 6, further
comprising a step of detecting whether paper jam problems are
caused in the process of feeding the papers by virtue of getting
pulse frequency variations of the velocity sensor.
9. The paper feeding method as claimed in claim 8, further
comprising a step of sending instructions at the time of the paper
jam problems being detected, and the motor being stopped
rotating.
10. The paper feeding method as claimed in claim 6, wherein the
pickup roller assembly includes a pickup shaft, a pickup roller
pivotally mounted around one end of the pickup shaft, and the
velocity sensor is mounted to the pickup shaft.
11. The paper feeding method as claimed in claim 10, wherein the
velocity sensor is an optical rotary encoder.
12. The paper feeding method as claimed in claim 11, wherein the
optical rotary encoder includes a light source, a coded disc and a
light receiver, the coded disc is fastened to the pickup shaft, the
coded disc is disposed between the light source and the light
receiver, and when the motor drives the pickup roller assembly to
rotate to pick up the papers, the pickup shaft and the coded disc
rotate together at the same speed, but the light source and the
light receiver do not rotate with the pickup shaft.
13. The paper feeding method as claimed in claim 12, wherein the
light source is turned on, the coded disc opens a plurality of
equidistant openings arranged as a ring shape, and the light
receiver receives light beams penetrating through the openings at
the time of the pickup shaft and the coded disc rotating together.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention generally relates to a paper feeding
device, and more particularly to a paper feeding device mounted in
a scanner capable of having a better scanning effect and a lower
cost, and a paper feeding method applied thereto.
2. The Related Art
[0002] Generally, a current paper feeding device is mounted in a
scanner, includes a pickup roller assembly, a feeding roller
assembly, a scan sensor and a motor. The motor drives the pickup
roller assembly to rotate for picking up papers and transmitting
the papers to the feeding roller assembly. The feeding roller
assembly feeds forward the papers transmitted by the pickup roller
assembly. When a front edge of each of the papers touches the scan
sensor, a scanning switch is triggered and a scanning process is
started. The current paper feeding device is also able to be
mounted in a multifunctional printer.
[0003] However, a cost of the scan sensor is higher, and the scan
sensor can just trigger the scanning switch, speeds of feeding the
papers are incapable of being known, the speeds of feeding the
papers are nonuniform that will make scanned images shortened or
stretched. As a result, the scanner including the current paper
feeding device has a worse scanning effect and a higher cost
thereof.
[0004] Thus, an innovative paper feeding device and a paper feeding
method applied thereto are essential to be provided, the scanner
including the innovative paper feeding device is capable of having
a better scanning effect and a lower cost.
SUMMARY OF THE INVENTION
[0005] An object of the present invention is to provide a paper
feeding device mounted in a scanner for feeding papers. The paper
feeding device includes a motor, a pickup roller assembly, a
velocity sensor and a feeding roller assembly. The pickup roller
assembly is connected with and driven by the motor for picking up
the papers and transmitting the papers to the feeding roller
assembly. The velocity sensor is mounted to the pickup roller
assembly for detecting rotating speeds of the pickup roller
assembly so as to detect speeds of feeding forward the papers. The
rotating speed of the pickup roller assembly is detected by virtue
of counting pulses outputted by the velocity sensor. The feeding
roller assembly is connected with and driven by the motor, and is
located in front of the pickup roller assembly for continuing
feeding forward the papers. A rotating speed of the feeding roller
assembly is faster than the rotating speed of the pickup roller
assembly. After one of the papers is fed to the feeding roller
assembly, the feeding roller assembly drives the one of the papers
to be fed accelerately, at the moment, the pickup roller assembly
rotates accelerately on account of being dragged by the one of the
papers, a speed discrepancy will be generated between the rotating
speed of the pickup roller assembly after the one of the papers is
fed to the feeding roller assembly and the rotating speed of the
pickup roller assembly which just picks up the one of the papers,
when the speed discrepancy reaches a preset value set by the
scanner, the scanner is triggered to start scanning.
[0006] Another object of the present invention is to provide a
paper feeding method applied to a paper feeding device which is
mounted in a scanner for feeding papers. The paper feeding device
includes a motor, a pickup roller assembly connected with the
motor, a velocity sensor mounted to the pickup roller assembly, and
a feeding roller assembly connected with the motor. Steps of the
paper feeding method are described hereinafter. The motor drives
the pickup roller assembly to rotate to pick up the papers and
transmit the papers to the feeding roller assembly. The velocity
sensor detects rotating speeds of the pickup roller assembly by
virtue of counting pulses outputted by the velocity sensor so as to
detect speeds of feeding forward the papers. The motor drives the
feeding roller assembly to rotate for continuing feeding forward
the papers transmitted by the pickup roller assembly to a scan
passageway of the scanner. Get a speed discrepancy between the
rotating speed of the pickup roller assembly after the one of the
papers is fed to the feeding roller assembly and the rotating speed
of the pickup roller assembly which just picks up the one of the
papers, when the speed discrepancy reaches a preset value set by
the scanner, the scanner is triggered to start scanning.
[0007] As described above, the speeds of feeding forward the papers
are able to be detected in real time by virtue of the velocity
sensor being fastened to the pickup roller assembly of the paper
feeding device, and a scan scaling of the scanner is
correspondingly modulated according to the speeds of feeding
forward the papers, so that scan images will be without being
shortened or stretched in the scan process for improving quality of
the scan images. In addition, the speed discrepancy will be
generated between the rotating speed of the pickup roller assembly
after the one of the papers is fed to the feeding roller assembly
and the rotating speed of the pickup roller assembly which just
picks up the one of the papers, and the scanner is triggered to
start scanning when the speed discrepancy reaches the preset value,
so the papers are able to be scanned in real time in no need of the
scan sensor. As a result, the scanner applying the paper feeding
device is capable of having a better scanning effect and a lower
cost.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The present invention will be apparent to those skilled in
the art by reading the following description, with reference to the
attached drawings, in which:
[0009] FIG. 1 is a perspective view of a paper feeding device in
accordance with an embodiment of the present invention;
[0010] FIG. 2 is a schematic diagram of the paper feeding device of
FIG. 1 being mounted in a scanner;
[0011] FIG. 3 is a schematic diagram of a pulse frequency variation
of a velocity sensor of the paper feeding device of FIG. 1 under a
condition of the pickup roller assembly being in different rotating
speeds; and
[0012] FIG. 4 is a flow chart of a paper feeding method being
applied to the paper feeding device of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] With reference to FIG. 1 and FIG. 2, a paper feeding device
100 in accordance with an embodiment of the present invention is
shown. The paper feeding device 100 is mounted in a scanner (not
shown) for feeding papers 200. The paper feeding device 100
includes a motor 40, a pickup roller assembly 10, a velocity sensor
20 and a feeding roller assembly 30.
[0014] Referring to FIG. 1 and FIG. 2 again, the pickup roller
assembly 10 is connected with and driven by the motor 40. The
pickup roller assembly 10 includes a pickup shaft 11, and a pickup
roller 12 pivotally mounted around one end of the pickup shaft 11.
The pickup roller assembly 10 is used for picking up the papers
200, and transmitting the papers 200 to the feeding roller assembly
30.
[0015] Referring to FIG. 1 to FIG. 3, the velocity sensor 20 is
mounted to the pickup roller assembly 10. Specifically, the
velocity sensor 20 is mounted to the pickup shaft 11 of the pickup
roller assembly 10 for detecting rotating speeds of the pickup
roller assembly 10 so as to detect speeds of feeding forward the
papers 200. The velocity sensor 20 is an optical rotary encoder.
The velocity sensor 20, namely the optical rotary encoder includes
a light source 21, a coded disc 22 and a light receiver 23. The
coded disc 22 opens a plurality of equidistant openings 221
arranged as a ring shape. The coded disc 22 is fastened to the
other end of the pickup shaft 11. The coded disc 22 is disposed
between the light source 21 and the light receiver 23. When the
scanner is started, the light source 21 is turned on.
[0016] The motor 40 drives the pickup roller assembly 10 to rotate
to pick up the papers 200 and transmit the papers 200 to the
feeding roller assembly 30. When the motor 40 drives the pickup
roller assembly 10 to rotate to pick up the papers 200, the pickup
shaft 11 and the coded disc 22 rotate together at the same speed.
The light source 21 and the light receiver 23 are without rotating
with the pickup shaft 11. The light receiver 23 receives light
beams penetrating through the openings 221 at the time of the
pickup shaft 11 and the coded disc 22 rotating together. The
velocity sensor 20 outputs pulses corresponding to the openings
221. So a rotation amount of the pickup roller assembly 10, namely
the rotating speed of the pickup roller assembly 10 is detected by
virtue of counting the pulses outputted by the velocity sensor
20.
[0017] Referring to FIG. 3, a schematic diagram of a pulse
frequency variation of the velocity sensor 20 under a condition of
the pickup roller assembly 10 being in different rotating speeds is
shown in FIG. 3. Within preset time, the higher a pulse frequency
of the velocity sensor 20 is, the more a quantity of the pulses per
unit time is, namely the faster the rotating speed of the pickup
roller assembly 10 is; the lower the pulse frequency of the
velocity sensor 20 is, the less the quantity of the pulses per unit
time is, namely the slower the rotating speed of the pickup roller
assembly 10 is.
[0018] Referring to FIG. 1 and FIG. 2 again, the feeding roller
assembly 30 is connected with and driven by the motor 40, and is
located in front of the pickup roller assembly 10 for continuing
feeding forward the papers 200 transmitted by the pickup roller
assembly 10 to a scan passageway 300.
[0019] Referring to FIG. 1 to FIG. 3, when the paper feeding device
100 is working, the motor 40 drives the pickup roller assembly 10
and the feeding roller assembly 30 to rotate, and the pickup roller
assembly 10 and the feeding roller assembly 30 rotate in different
rotating speeds. The rotating speed of the feeding roller assembly
30 is faster than the rotating speed of the pickup roller assembly
10. The pickup roller assembly 10 rolls to pick up the papers 200
and the papers 200 are fed forward in a preset speed. After one of
the papers 200 is fed to the feeding roller assembly 30, the
feeding roller assembly 30 drives the one of the papers 200 to be
fed accelerately, at the moment, the pickup roller assembly 10
rotates accelerately on account of being dragged by the one of the
papers 200. A speed discrepancy will be generated between the
rotating speed of the pickup roller assembly 10 after one of the
papers 200 is fed to the feeding roller assembly 30 and the
rotating speed of the pickup roller assembly 10 which just picks up
the one of the papers 200.
[0020] S1 shown in FIG. 3 is the pulse frequency of the velocity
sensor 20 when the pickup roller assembly 10 just picks up the
papers 200. S2 shown in FIG. 3 is the pulse frequency of the
velocity sensor 20 when the feeding roller assembly 30 drives the
papers 200 to be fed accelerately. S3 shown in FIG. 3 is the pulse
frequency of the velocity sensor 20 when the papers 200 is apart
away from the pickup roller assembly 10. The speed discrepancy is
got by virtue of the variation of the pulse frequency of the
velocity sensor 20 every time. When the speed discrepancy reaches a
preset value set by the scanner, a scan switch (not shown) of the
scanner is triggered to start scanning.
[0021] A time point of the scanner applying the paper feeding
device 100 scanning each of the papers 200 is the same as a
timeliness of a conventional scan being proceeded by virtue of each
of the papers 200 touching a scan sensor (not shown), so that the
papers 200 are able to be scanned in real time in no need of the
scan sensor. In the scan process, the speeds of feeding forward the
papers 200 are able to be detected in real time according to the
pulse frequency variations of the velocity sensor 20, and a scan
scaling of the scanner is correspondingly modulated according to
the speeds of feeding forward the papers 200, so that scan images
of the papers 200 will be without being shortened or stretched in
the scan process for improving quality of the scan images. Paper
jam problems are also able to be detected in the process of feeding
the papers 200 by virtue of getting the pulse frequency variations
of the velocity sensor 20, so that instructions are sent at the
time of the paper jam problems being detected, and the motor 40 is
stopped rotating for preventing the papers 200 from being
damaged.
[0022] The paper feeding device 100 is also able to be mounted in a
multifunctional printer (not shown).
[0023] A paper feeding method in accordance with an embodiment of
the present invention is shown. The paper feeding method is applied
to the paper feeding device 100 which is mounted in the scanner for
feeding the papers 200. Specific steps of the paper feeding method
are described as follows.
[0024] The motor 40 drives the pickup roller assembly 10 to rotate
to pick up the papers 200 and transmit the papers 200 to the
feeding roller assembly 30.
[0025] The velocity sensor 20 detects the rotating speeds of the
pickup roller assembly 10 by virtue of counting the pulses
outputted by the velocity sensor 20 so as to detect the speeds of
feeding forward the papers 200.
[0026] The motor 40 drives the feeding roller assembly 30 to rotate
for continuing feeding forward the papers 200 transmitted by the
pickup roller assembly 10 to the scan passageway 300 of the
scanner.
[0027] Get the speed discrepancy between the rotating speed of the
pickup roller assembly 10 after the one of the papers 200 is fed to
the feeding roller assembly 30 and the rotating speed of the pickup
roller assembly 10 which just picks up the one of the papers 200,
when the speed discrepancy reaches the preset value set by the
scanner, the scanner is triggered to start scanning.
[0028] The paper feeding method applied to the paper feeding device
100 which is mounted in the scanner, further includes a step of
modulating the scaling of the scan according to the speeds of
feeding forward the papers 200.
[0029] The paper feeding method applied to the paper feeding device
100 which is mounted in the scanner, further includes a step of
detecting whether the paper jam problems are caused in the process
of feeding the papers 200 by virtue of getting the pulse frequency
variations of the velocity sensor 20.
[0030] The paper feeding method applied to the paper feeding device
100 which is mounted in the scanner, further includes a step of
sending the instructions at the time of the paper jam problems
being detected, and the motor 40 being stopped rotating.
[0031] As described above, the speeds of feeding forward the papers
200 are able to be detected in the real time by virtue of the
velocity sensor 20 being fastened to the pickup shaft 11 of the
pickup roller assembly 10 of the paper feeding device 100, and the
scan scaling of the scanner is correspondingly modulated according
to the speeds of feeding forward the papers 200, so that the scan
images will be without being shortened or stretched in the scan
process for improving the quality of the scan images. In addition,
the speed discrepancy will be generated between the rotating speed
of the pickup roller assembly 10 after the one of the papers 200 is
fed to the feeding roller assembly 30 and the rotating speed of the
pickup roller assembly 10 which just picks up the one of the papers
200, and the scanner is triggered to start scanning when the speed
discrepancy reaches the preset value, so the papers 200 are able to
be scanned in the real time in no need of the scan sensor. As a
result, the scanner applying the paper feeding device 100 is
capable of having a better scanning effect and a lower cost.
* * * * *