CN102530594A - Automatic paper feeder - Google Patents

Abstract

The invention relates to an automatic paper feeding device, which comprises a shell, a pressing structure arranged at the bottom of the shell, a guide groove arranged on the pressing structure, a plurality of first paper guide ribs and a plurality of second paper guide ribs. The plurality of first paper guide ribs are arranged at the downstream of the guide groove, the plurality of second paper guide ribs are adjacent to the plurality of first paper guide ribs, and the height of the first paper guide ribs is smaller than that of the second paper guide ribs. The lower first paper guide rib is used for guiding a thicker paper, and the higher second paper guide rib is used for guiding a thinner paper. The automatic paper feeding device can feed paper with different thicknesses into the paper feeding channel by means of structural change design, does not need to arrange a moving mechanism so as to reduce the volume of the automatic paper feeding device, does not need to disperse the power provided by a power device for the moving mechanism, and does not increase the load of the automatic paper feeding device.

Description

Automatic paper feeder

technical field

The invention relates to an automatic paper feeding device, in particular to an automatic paper feeding device capable of feeding papers of different thicknesses.

Background technique

The early scanning device can only scan the image of a single document. When the user wants to scan a stack of documents, he must take out the scanned document and place the next document on the scanning device after the scanning device scans a document. Scan the next document. In view of the troublesomeness of manually replacing documents, an automatic document feeder, commonly known as the Automatic Document Feeder (ADF), has been developed on the market. It is used with a flatbed scanner and can complete a stack without manual document replacement. Scanning of documents, even double-sided scanning of documents.

In the traditional automatic paper feeding device, the internal paper feeding channel is specially designed for paper with a general thickness, and the height of the paper feeding channel is closely related to the friction force of the fed paper. The height controls the amount of friction that the paper is subjected to. When a traditional automatic document feeder feeds paper of normal thickness and the paper moves in the paper feeding path, the frictional force on the paper can make the paper pass through the scanning area of the flatbed scanner smoothly to ensure its image quality. However, when the conventional automatic paper feeder must feed paper of another thickness, and the other thickness is greater than the normal thickness, although the paper can be barely fed through the paper feeding path, the friction force of the paper is greater than that of the normal thickness paper The friction force received, therefore, will cause the decline of its image quality.

In view of this, there is an automatic paper feeding device on the market that can change the height of the paper feeding channel, please refer to FIG. 1 , which is a schematic side view of the structure of a traditional automatic paper feeding device. Fig. 1 shows that a traditional automatic document feeding device 10 is combined with a flatbed scanner 11 to form a scanning device 1. The traditional automatic document feeding device 10 includes a housing 101, a paper tray 102, a paper pickup roller group 103, a The paper feeding channel 104 , a plurality of paper feeding roller sets 105 , a channel adjustment module 106 , a paper output roller set 107 and a paper output box 108 . The flatbed scanner 11 includes a scanner housing 111 , a scanning platform 112 and a scanning module 113 . The structure and functions of the flatbed scanner 11 are well known to those skilled in the art, so details will not be repeated here.

In the conventional automatic paper feeding device 10, the paper tray 102 is arranged on the casing 101 for placing a first paper P1 and a second paper P2, wherein the first paper P1 has a first thickness T1, and the second paper P2 It has a second thickness T2, and the second thickness T2 is greater than the first thickness T1. For example, the first paper P1 is a paper with a thickness T1 of about 0.15 centimeters (mm), and the thickness T2 of the second paper P2 is about 0.3 cm. The paper pickup roller set 103 is adjacent to the paper tray 102 for feeding the first paper P1 and the second paper P2 on the paper tray 102 into the paper feeding channel 104, and the paper feeding channel 104 is located in the casing 101 for The first paper P1 and the second paper P2 are fed therein. In FIG. 1 , the path height of the paper feeding path 104 is equal to a first path height H1. A plurality of paper feeding rollers 105 are disposed on the paper feeding channel 104 for feeding the first paper P1 and the second paper P2. The paper output roller set 107 is used to feed the first paper P1 and the second paper P2 to the paper output box 108 , and the paper output box 108 is used to place the first paper P1 and the second paper P2 thereon.

As for the channel adjustment module 106 located in the casing 101 , it is used to control the channel height of the paper feeding channel 104 . The channel adjustment module 106 includes a channel adjustment roller 1061 , a moving mechanism 1062 , and a rotating mechanism 1063 . The path adjusting roller 1061 is used to contact and feed the first paper P1 or the second paper P2 to move the first paper P1 or the second paper P2 in the paper feeding path 104 . The moving mechanism 1062 is connected to the channel adjustment roller 1061 for moving the channel adjustment roller 1061 up and down relative to the paper feeding channel 104 to change the channel height of the paper feeding channel 104 . The rotating mechanism 1063 is connected to the channel adjusting roller 1061 for driving the channel adjusting roller 1061 to rotate.

Please continue to refer to FIG. 1, when the first paper P1 is fed by the traditional automatic paper feeding device 10, the first paper P1 located on the paper tray 102 is fed into the paper feeding channel 104 by the paper picking roller group 103, and is fed by multiple A paper feeding roller set 105 feeds the first paper P1 so that the first paper P1 can move in the paper feeding path 104 . When the first paper P1 passes above the scanning platform 112 and the scanning module 113, the first passage height H1 of the paper feeding passage 104 can make the first paper P1 be smoothly scanned by the scanning module 113, and then, the paper feeding roller 105 and the output The paper roller set 107 feeds the first paper P1 to the output tray 108 , and the scanning of the first paper P1 is completed.

When the traditional automatic paper feeding device 10 intends to feed the second paper P2 with a larger thickness, the moving mechanism 1062 of the channel adjustment module 106 moves the channel adjustment roller 1061, so that the channel adjustment roller 1061 moves upward relative to the paper feeding channel 104, thus , the passage height of the paper feeding passage 104 is equal to a second passage height H2, and the second passage height H2 is greater than the first passage height H1, as shown in FIG. 2 . Therefore, when the second paper P2 passes through the paper feeding passage 104 , the frictional force experienced by the second paper P2 can make the second paper P2 be scanned smoothly to obtain good image quality. The feeding process of the second paper P2 is the same as that of the first paper P1, and no further description is given here.

Although the traditional automatic paper feeding device 10 can adjust the passage height of the paper feeding passage 104 by means of the passage adjustment module 106, the passage adjustment module 106 must additionally be equipped with a moving mechanism 1062, which not only occupies the space inside the casing 101 but cannot reduce the size of the traditional automatic paper feeding device. Due to the volume of the paper device 1 , the moving mechanism 1062 must be connected to the driving device (generally a motor), thus increasing the load of the traditional automatic paper feeding device 10 .

Contents of the invention

The object of the present invention is to provide an automatic paper feeding device with the function of feeding paper of different thickness without increasing the load.

In a preferred embodiment, the present invention provides an automatic paper feeding device, which is arranged on a scanning platform for feeding a first paper or a second paper, wherein the thickness of the first paper is smaller than that of the second paper thickness, the automatic paper feeder includes:

A casing has a bottom, and the bottom is in contact with the scanning platform;

a paper feeding channel, located in the housing and passing between the bottom and the scanning platform;

a pressing structure, arranged on the bottom, for pressing against the first paper or the second paper;

a guide groove, arranged on the pressing structure, used to guide the second paper to move between the paper feeding channels;

a plurality of first paper guide ribs, arranged downstream of the guide groove, for guiding the second paper to move in the paper feeding passage; and

a plurality of second paper guiding ribs, adjacent to the first paper guiding ribs, used to guide the first paper to move in the paper feeding channel; wherein the height of the first paper guiding ribs is smaller than that of the second paper guiding ribs the height of.

In a preferred embodiment, the automatic paper feeding device of the present invention also includes:

a driven wheel, arranged on the bottom and exposed outside the pressing structure, is used to assist in conveying the first paper and the second paper; and

A first opening is arranged on the pressing structure and is located at one side of the guide groove, and is passed through by the driven wheel so that the driven wheel is exposed outside the pressing structure.

In a preferred embodiment, the automatic paper feeding device of the present invention further includes an elastic member, one end of the elastic member is connected to the bottom of the housing, and the other end of the elastic member is connected to the driven wheel for providing An elastic force is given to the driven wheel.

In a preferred embodiment, the guide groove includes a guide groove bottom surface, the distance between the guide groove bottom surface and the paper feeding passage is greater than the distance between a surface of the pressing mechanism and the paper feeding passage, when the first paper When passing through the bottom, the first paper is in contact with the driven wheel and the surface of the pressing mechanism; and when the second paper is passing through the bottom, the second paper is in contact with the bottom surface of the guide groove.

In a preferred embodiment, the guide groove includes a guide groove bottom surface, the distance between the guide groove bottom surface and the paper feeding passage is greater than the distance between a surface of the pressing mechanism and the paper feeding passage, when the first paper When passing through the bottom, the first paper is in contact with the surface of the pressing mechanism; and when the second paper is passing through the bottom, the second paper is in contact with the bottom surface of the guide groove.

In a preferred embodiment, the automatic paper feeding device of the present invention also includes:

a second opening located downstream of the first paper guiding rib; and

A transmission roller passes through the second opening for feeding the first paper and the second paper.

In a preferred embodiment, the automatic paper feeding device of the present invention further includes a transmission shaft passing through the transmission roller for driving the transmission roller to rotate the transmission roller.

In a preferred embodiment, the automatic paper feeding device of the present invention also includes:

a first paper tray, set on the casing, for placing the first paper;

a second paper tray, set on the housing and located at one side of the housing, for placing the second paper;

a first paper picking roller set, adjacent to the first paper tray, for feeding the first paper on the first paper tray into the paper feeding channel;

a second paper picking roller set, adjacent to the second paper tray, for feeding the second paper on the second paper tray into the paper feeding channel;

a paper output tray, arranged below the first paper tray, for placing the first paper and the second paper passing through the paper feeding channel;

a plurality of paper feeding roller sets, arranged on the paper feeding channel; used to feed the first paper and the second paper so that the first paper and the second paper move in the paper feeding channel; and

A paper output roller set is adjacent to the paper output box and is used for feeding the first paper and the second paper to the paper output box.

In a preferred embodiment, the plurality of second paper guiding ribs are respectively located on two sides of the plurality of first paper guiding ribs, and each of the second paper guiding ribs is parallel to each of the first paper guiding ribs.

In a preferred embodiment, the first paper is an A4 paper, and the second paper is a business card, and the width of the guide groove is greater than or equal to the width of the second paper.

The automatic paper feeding device of the present invention is capable of feeding paper of different thicknesses in the paper feeding passage through structural design changes, without the need for an additional moving mechanism to adjust the height of the paper feeding passage, so the automatic paper feeding device of the present invention does not It is necessary to provide a moving mechanism to reduce its size, and it is not necessary to disperse the power provided by the power device to the moving mechanism, without increasing the load of the automatic paper feeding device.

Description of drawings

Fig. 1 is a schematic side view of the structure of a traditional automatic paper feeding device.

Fig. 2 is a schematic side view of the structure of the traditional automatic paper feeding device for changing the height of the paper feeding channel.

FIG. 3 is a schematic side view of the structure of the automatic paper feeding device in a preferred embodiment of the present invention.

FIG. 4 is a structural schematic view of the bottom of the casing of the automatic paper feeding device in a preferred embodiment of the present invention.

5 is a schematic cross-sectional view of the bottom of the housing of the automatic paper feeding device in a preferred embodiment of the present invention.

FIG. 6 is a schematic side view of the partial structure of the automatic paper feeding device feeding the first paper in a preferred embodiment of the present invention.

Fig. 7 is a schematic side view of the partial structure of the automatic paper feeding device feeding the second paper in a preferred embodiment of the present invention.

Wherein, the reference signs are explained as follows:

1, 2 scanning device

10, 20 Automatic paper feeding device

11, 22 flatbed scanner

101, 201 shell

102, 202, 203 Trays

103, 204, 205 paper pickup roller set

104, 206 paper feed channel

105, 207 Feed roller set

106 channel adjustment module

107, 212 Paper output roller group

108, 213 output tray

208 compression structure

209 guide groove

210 The first paper guide rib

211 Second paper guide rib

214 passive wheel

215, 216 openings

217 Transmission roller

218 transmission shaft

219 elastic parts

1061 channel adjustment wheel

1062 Mobile Mechanism

1063 Turning mechanism

2011 Bottom

2071 Paper feeding driving roller

2072 paper feeding passive roller

2073 Roller shaft

2081 Press against the surface of the structure

2091 Bottom surface of guide groove

H1, H2 Height

Hr1 Height of the first paper guide rib

Hr2 Height of the second paper guide rib

P1, P2, P1 ^* , P2 ^* paper

T1, T2, T1 ^* , T2 ^* thickness

Detailed ways

In view of the defects of the traditional technology, the present invention provides an automatic paper feeding device. Please refer to FIG. 3 , which is a schematic side view of the structure of the automatic paper feeding device in a preferred embodiment of the present invention. Similar to the conventional automatic document feeding device 10 , the automatic document feeding device 20 is disposed on a flatbed scanner 22 and combined with the flatbed scanner 22 to form an automatic document feeding scanning device 2 . The automatic paper feeding device 20 includes a housing 201, a first paper tray 202, a second paper tray 203, a first paper pickup roller set 204, a second paper pickup roller set 205, and a paper feed channel 206 , a plurality of paper feeding roller sets 207, a pressing structure 208, a guide groove 209 (see Figure 4), a plurality of first paper guide ribs 210, a plurality of second paper guide ribs 211, a paper output roller set 212 , a paper output box 213, a driven wheel 214, a first opening 215, a second opening 216, a transmission roller 217, a transmission shaft 218 and an elastic member 219 (see FIG. 5). The flatbed scanner 22 includes a scanner housing 221 , a scanning platform 222 and a scanning module 223 . The structure and functions of the flatbed scanner 22 are well known to those skilled in the art, so details will not be repeated here.

In FIG. 3 , a bottom 2011 of the housing 201 is in contact with the scanning platform 222 of the flatbed scanner 22 . The first paper tray 202 is disposed on the housing 201 for placing a first paper P1 ^* , and the second paper tray 203 is disposed on the housing 201 and is located on one side of the housing 201 for placing a first paper P1*. Two papers P2 ^* , wherein the first paper P1 ^* has a first thickness T1 ^* , the second paper P2 ^* has a second thickness T2 ^* , and the second thickness T2 ^* is greater than the first thickness T1 ^* . In this preferred embodiment, the first paper P1 ^* is an A4 paper with a first thickness T1 ^* of about 0.15 cm, and the second paper P2 ^* is a business card with a second thickness T2 ^* of about 0.3 cm. The first paper pickup roller set 204 is adjacent to the first paper tray 202 for feeding the first paper P1 ^* on the first paper tray 202 into the paper feeding path 206 . Similarly, the second paper pickup roller set 205 is adjacent to the second paper tray 203 for feeding the second paper P2 ^* on the second paper tray 203 into the paper feeding channel 206, and the paper feeding channel 206 is located in the casing In 201, the first paper P1 ^* and the second paper P2 ^* are fed therein.

Please continue to refer to FIG. 3 , a plurality of paper feeding roller sets 207 are disposed on the paper feeding channel 206 for feeding the first paper P1 ^* and the second paper P2 ^* . Each paper feeding roller set 207 includes a paper feeding active roller 2071 , a paper feeding passive roller 2072 and two roller shafts 2073 corresponding to the paper feeding active roller 2071 and the paper feeding passive roller 2072 . The active paper feeding roller 2071 is driven to rotate, and the passive paper feeding roller 207 is driven by the movement of the first paper P1 ^* or the second paper P2 ^* fed by the paper feeding active roller 2071 . As for the two roller shafts 2073 passing through the paper-feeding driving roller 2071 and the paper-feeding passive roller 2072 respectively. The paper output roller set 212 is used to feed the first paper P1 ^* and the second paper P2 ^* to the paper output box 213, and the paper output box 213 is used to place the first paper P1 ^* and the second paper P2 passing through the paper feeding channel 206 ^* on it.

Next, please refer to FIG. 3 and FIG. 4 at the same time. FIG. 4 is a structural diagram of the bottom of the casing of the automatic paper feeding device in a preferred embodiment of the present invention. 3 and 4, the pressing structure 208 is arranged on the bottom 2011 of the casing 201, that is, above the scanning platform 222, for pressing against the first paper P1 ^* or the second paper P2 ^* , in this preferred implementation In one example, the pressing structure 208 is a paper pressing sheet. The guide groove 209 is disposed on the pressing structure 208, and is used to guide the second paper P2 ^* to move in the paper feeding passage 206. The guide groove 209 includes a guide groove bottom surface 2091, and the distance between the guide groove bottom surface 2091 and the paper feeding passage 206 The distance is greater than the distance between a surface 2081 of the pressing mechanism 208 and the paper feeding path 206. In addition, the guide groove width of the guide groove 209 is greater than or equal to the width of the second paper P2 ^* , so that the second paper P2 ^* can pass through the guide groove 209 and is fed in the paper feeding channel 206 smoothly.

A plurality of first paper guiding ribs 210 are disposed downstream of the guide groove 209 for guiding the second paper P2 ^* to move in the paper feeding path 206, and each first paper guiding rib 210 has a first paper guiding rib Height Hr1. A plurality of second paper guiding ribs 211 are adjacent to the first paper guiding ribs 210 for guiding the first paper P1 ^* to move in the paper feeding path 206, and each second paper guiding rib 211 has a second paper guiding rib 211 Rib height Hr2, as can be seen from FIG. 4, a plurality of second paper guide ribs 211 are respectively located on both sides of a plurality of first paper guide ribs 210, and each second paper guide rib 211 is parallel to each first paper guide rib 210 , wherein the first paper guide rib height Hr1 is smaller than the second paper guide rib height Hr2. The first opening 215 is disposed on the pressing structure 208 and on one side of the guiding groove 209 , and the second opening 216 is located downstream of the first paper guiding rib 211 . The transmission roller 217 passes through the second opening 216 for feeding the first paper P1 ^* and the second paper P2 ^* , and the transmission roller 217 is passed by the transmission shaft 218, and the transmission shaft 218 is connected to a power device (not shown in Among the figure) and driven by it, the transmission roller 217 is driven by the transmission shaft 218 to rotate.

Next, please refer to FIG. 4 and FIG. 5 at the same time. FIG. 5 is a schematic cross-sectional structural view of the bottom of the casing of the automatic paper feeding device in a preferred embodiment of the present invention. In Fig. 5, one end of the elastic member 219 is connected to the bottom 2011 of the housing 201, and the other end of the elastic member 219 is connected to the driven wheel 214 to provide an elastic force to the driven wheel 214. In this preferred embodiment, the elastic Part 219 is a spring. On the other hand, the driven wheel 214 is arranged on the bottom 2011 of the casing 201 by being connected to the elastic member 219, and when the driven wheel 214 is pushed against, the elastic member 219 is compressed so that the driven wheel 214 is accommodated in the first Conversely, when the driven wheel 214 is not pushed against, the driven wheel 214 passes through the first opening 215 and is exposed outside the pressing structure 208, so the driven wheel 214 can assist in conveying the first paper P1 ^* and Second paper P2 ^* .

Next, the situation of feeding the first paper P1 ^* by the automatic paper feeding device 20 will be described. Please refer to FIG. 3 and FIG. 6 at the same time. FIG. 6 is a partial structure side view of the automatic paper feeding device feeding the first paper in a preferred embodiment of the present invention. schematic diagram. The first paper P1 ^* on the first paper tray 202 is fed into the paper feeding channel 206 by the first paper pickup roller set 204, and the first paper P1 ^* is fed by the paper feeding roller set 207, so that the first paper P1 ^* is moved in the paper feeding path 206 . When the first paper P1 ^* passes through the paper feeding path 206 between the scanning platform 222 and the bottom 2011 of the casing 201 (that is, the first paper P1 ^* passes through the bottom 2011), the first paper P1 ^* and the driven wheel 214 and the pressure The surface 2081 of the abutting mechanism 208 contacts, and the driven wheel 214 is driven by the first paper P1 ^* to rotate, so as to assist the first paper P1 ^* to be transported. At this moment, the first paper P1 ^* passes through the bottom 2011 smoothly, and on the other hand, the scanning module 223 in the flatbed scanner 22 scans the first paper P1 ^* . Next, the first paper P1 ^* moving in the paper feeding path 206 contacts the plurality of second paper guiding ribs 211 and is guided by the plurality of second paper guiding ribs 211 to move in the paper feeding path 206 . Finally, the first paper P1 ^* is sequentially fed to the paper output tray 213 by the transmission roller 217 and the paper output roller set 212 , and the scanning of the first paper P1 ^* is completed.

As for the feeding of the second paper P2 ^* by the automatic paper feeding device 20, please refer to FIG. 3 and FIG. 7 at the same time. FIG. The second paper P2 ^* on the second paper tray 203 is fed into the paper feeding channel 206 by the second paper pickup roller set 205, and the second paper P2 ^* is fed by the paper feeding roller set 207, so that the second paper P2 ^* is moved in the paper feeding path 206 . When the second paper P2 ^* passes through the paper feeding path 206 between the scanning platform 222 and the bottom 2011 of the housing 201 (that is, the second paper P2 ^* passes through the bottom 2011), the second paper P2 ^* contacts the driven wheel 214 and Push against the driven wheel 214, so that the elastic member 219 is compressed, and the driven wheel 214 is accommodated in the first opening 215, so the second paper P2 ^* is in contact with the bottom surface 2091 of the guide groove 209, due to the guide groove 209 The distance difference between the groove bottom surface 2091 and the surface 2081 of the pressing mechanism 208 provides a space, so that the part of the second paper P2 ^* that exceeds the first thickness T1 ^* can pass between the guide groove bottom surface 2091 and the surface 2081 of the pressing mechanism 208 space, so that the second paper P2 ^* is not subject to excessive friction due to its greater thickness.

At the same time, the driven wheel 214 accommodated in the first opening 215 is still in contact with the second paper P2 ^* , so the driven wheel 214 is driven to rotate to assist the second paper P2 to be transported. At this time, the second paper P2 passes through the bottom 2011 smoothly, and on the other hand, the scanning module 223 in the flatbed scanner 22 scans the second paper P2. Next, the second paper P2 ^* moving in the paper feeding path 206 contacts the plurality of first paper guiding ribs 210 through the guide groove 309, and is guided by the plurality of first paper guiding ribs 210 to enter the paper feeding path 206. Movement, wherein due to the height difference between the first rib height Hr1 of the first rib 210 and the second rib height Hr2 of the second rib 211, the second paper P2 ^* exceeds the first thickness T1 A part of ^* can pass through the first paper guide rib 210, and the second paper P2 ^* is not subject to excessive friction. Finally, the second paper P2 ^* is sequentially fed to the paper output tray 213 by the transmission roller 217 and the paper output roller set 212 , and the scanning of the second paper P2 ^* is completed.

In addition, the present invention also proposes another preferred embodiment. The structure of the automatic paper feeding device in this preferred embodiment is substantially the same as that of the automatic paper feeding device 20. The difference between the two is that the automatic paper feeding device in this preferred embodiment The paper device is not provided with a driven wheel and its related elements (that is, the first opening and the elastic member), so that when the second paper is fed, the second paper directly contacts the bottom surface of the guide groove and passes through the guide groove The space between the bottom surface and the surface that presses against the mechanism. That is to say, even if the driven wheel is not provided, the second paper can still be fed in the paper feeding passage without excessive friction.

According to the above, in the automatic paper feeding device of the present invention, a pressing structure is provided at the bottom of the casing, and a guide groove is arranged on the pressing structure, so that the surface drop between the guide groove and the pressing structure forms a space for The second paper with greater thickness passes. Moreover, a plurality of first paper guiding ribs are arranged downstream of the guide groove, and a plurality of second paper guiding ribs are arranged on both sides of the plurality of first paper guiding ribs, and the height of the first paper guiding ribs is smaller than that of the first paper guiding ribs. The height of the second paper guide rib. Due to the height difference between the first paper guide rib and the second paper guide rib, the second paper with a larger thickness can be guided by the first paper guide rib and pass through the paper feeding passage, so the second paper can be fed in In the paper feeding path without excessive friction. In summary, the automatic paper feeding device of the present invention is able to feed paper of different thicknesses in the paper feeding passage through structural design changes, without additionally setting a moving mechanism to adjust the height of the paper feeding passage, so the present invention The automatic paper feeding device does not need to be equipped with a moving mechanism so that its size can be reduced, and it does not need to disperse the power provided by the power device to the moving mechanism, without increasing the load of the automatic paper feeding device.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the claims of the present invention. Therefore, all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in the present invention. within the scope of the claims.

Claims (10)

1. An automatic paper feeding device, arranged on a scanning platform, for feeding a first paper or a second paper, wherein the thickness of the first paper is smaller than the thickness of the second paper, the automatic paper feeding device comprises : A casing has a bottom, and the bottom is in contact with the scanning platform; a paper feeding channel, located in the housing and passing between the bottom and the scanning platform; a pressing structure, arranged on the bottom, for pressing against the first paper or the second paper; a guide groove, arranged on the pressing structure, used to guide the second paper to move between the paper feeding paths; a plurality of first paper guide ribs, arranged downstream of the guide groove, for guiding the second paper to move in the paper feeding path; and a plurality of second paper guiding ribs, adjacent to the first paper guiding ribs, for guiding the first paper to move in the paper feeding path; wherein the height of the first paper guiding ribs is smaller than that of the second paper guiding ribs the height of. 2. The automatic paper feeding device according to claim 1, further comprising: a driven wheel, arranged on the bottom and exposed outside the pressing structure, is used to assist in conveying the first paper and the second paper; and A first opening is arranged on the pressing structure and is located at one side of the guide groove, and is passed through by the driven wheel so that the driven wheel is exposed outside the pressing structure. 3. The automatic paper feeding device according to claim 2, further comprising an elastic member, one end of the elastic member is connected to the bottom of the housing, and the other end of the elastic member is connected to the passive The wheel is used to provide an elastic force to the driven wheel. 4. The automatic paper feeding device according to claim 3, wherein the guide groove includes a bottom surface of the guide groove, and the distance between the bottom surface of the guide groove and the paper feeding passage is greater than the distance between a surface of the pressing mechanism and the feeding passage. When the first paper passes through the bottom, the first paper is in contact with the driven wheel and the surface of the pressing mechanism; and when the second paper passes through the bottom, the second paper is in contact with the surface of the pressing mechanism. The bottom surface of the guide groove is in contact. 5. The automatic paper feeding device according to claim 1, wherein the guide groove comprises a guide groove bottom surface, and the distance between the guide groove bottom surface and the paper feeding passage is greater than a distance between a surface of the pressing mechanism and the feeding paper passage. The distance between the paper passages, when the first paper passes through the bottom, the first paper is in contact with the surface of the pressing mechanism; and when the second paper passes through the bottom, the second paper is in contact with the bottom surface of the guide groove touch. 6. The automatic paper feeding device according to claim 1, further comprising: a second opening located downstream of the first paper guiding rib; and A transmission roller passes through the second opening for feeding the first paper and the second paper. 7. The automatic paper feeding device according to claim 6, further comprising a transmission shaft passing through the transmission roller for driving the transmission roller to rotate the transmission roller. 8. The automatic paper feeding device according to claim 1, further comprising: a first paper tray, set on the casing, for placing the first paper; a second paper tray, set on the housing and located at one side of the housing, for placing the second paper; a first paper picking roller set, adjacent to the first paper tray, for feeding the first paper on the first paper tray into the paper feeding channel; a second paper picking roller set, adjacent to the second paper tray, for feeding the second paper on the second paper tray into the paper feeding channel; a paper output tray, arranged below the first paper tray, for placing the first paper and the second paper passing through the paper feeding channel; a plurality of paper feeding roller sets, arranged on the paper feeding channel, for feeding the first paper and the second paper so that the first paper and the second paper move in the paper feeding channel; and A paper output roller set is adjacent to the paper output box and is used for feeding the first paper and the second paper to the paper output box. 9. The automatic paper feeding device according to claim 1, wherein the plurality of second paper guiding ribs are respectively located on both sides of the plurality of first paper guiding ribs, and each of the second paper guiding ribs is parallel to on each of the first paper guide ribs. 10. The automatic paper feeding device according to claim 1, wherein the first paper is an A4 paper, and the second paper is a business card, and the guide groove width is greater than or equal to the second The width of the paper.

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