CN112833759A - Paper size sensing device - Google Patents
Paper size sensing device Download PDFInfo
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- CN112833759A CN112833759A CN201911156325.8A CN201911156325A CN112833759A CN 112833759 A CN112833759 A CN 112833759A CN 201911156325 A CN201911156325 A CN 201911156325A CN 112833759 A CN112833759 A CN 112833759A
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- paper
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- guide
- contact element
- rack
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Abstract
A paper size sensing device comprises a paper guide module, a sensing module and a control unit. The paper guide module moves relative to the paper feeding tray. The sensing module includes a contact element and a circuit board. The contact element is connected to the paper guide module. The circuit board comprises a first conductor part, a second conductor part and a plurality of fixed resistors. The first conductor portion includes a plurality of conductor segments corresponding to the fixed resistances. When the paper guide module moves to contact with two parallel sides of the paper, the paper guide module drives the contact element to move at the same time, so that the contact element is contacted with the first conductor sections of the conductor sections, and the contact element is contacted with the second conductor part, so that the fixed resistor corresponding to the first conductor section generates a resistance value, and the circuit board outputs a sensing signal. The control unit receives the sensing signal to obtain the size of the paper.
Description
Technical Field
The present invention relates to a paper size sensing device, and more particularly, to a paper size sensing device for a paper feeding device.
Background
Nowadays, automatic paper feeding devices are widely used in printers, photocopiers and office machines because of their sophistication, and the main purpose is to automatically feed a plurality of documents into a plurality of machines to save labor. Generally, a paper feeding device has a paper size detection mechanism for detecting the size of a document before the document is fed by the paper feeding device, so as to facilitate a plurality of machine operations. For example, a photocopier is usually provided with blank sheets of various sizes (A3, a4, a5, B4, B5, etc.), and if a user wants to copy a document of size a4 using the photocopier, the paper size detection mechanism will detect the size of the document to be copied in advance and transmit a detection signal to the photocopier, so that the photocopier automatically provides blank sheets of a4 size for copying.
The main components of the conventional paper size detecting mechanism include a paper feeding tray and a sensing module, wherein the paper feeding tray is composed of a paper tray and two corresponding paper guides, and the two paper guides can move to approach or separate from each other to clamp two sides of paper. Furthermore, the sensing module is configured on the paper placing tray, and the action of moving to the width of the paper is adjusted by the paper guide, so that the sensing module generates various digital signals to judge the size of the paper.
However, most of the sensing modules of the conventional paper size detecting mechanism are combined by a photo interrupter, a capacitive sensor or a metal spring to form a multi-bit digital code output, and the combined structure has many mechanical components and sensing units, which results in an increase in manufacturing cost. Therefore, how to improve the above problems is the focus of attention of those skilled in the art.
Disclosure of Invention
One objective of the present invention is to provide a paper size sensing device, which has a simple structure and is easy to assemble, and effectively reduces the manufacturing cost.
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.
In order to achieve one or a part of or all of the above or other objects, the present invention provides a paper size sensing device applied to a paper feeding tray of a paper feeding device, wherein the paper size sensing device includes a paper guiding module, a sensing module and a control unit. The paper guide module is configured on the paper feeding tray and can move relative to the paper feeding tray. The sensing module is configured on the paper feeding tray. The sensing module includes a contact element and a circuit board. The contact element is connected to the paper guide module. The circuit board comprises a first conductor part, a second conductor part and a plurality of fixed resistors. The first conductor part comprises a plurality of conductor sections which are arranged at intervals, the conductor sections are respectively and correspondingly connected with the fixed resistors, when the paper guide module moves relative to the paper feeding tray and contacts with two parallel side edges of the first paper, the paper guide module simultaneously drives the contact element to move, so that the contact element contacts with the first conductor section of the conductor sections of the first conductor part, and the contact element contacts with the second conductor part, so that the first fixed resistor correspondingly connected with the first conductor section generates a first resistance value, and the circuit board outputs a first sensing signal. The control unit is used for receiving the first sensing signal to obtain the distance between the two parallel side edges of the first paper.
In an embodiment of the invention, when the paper guiding module moves relative to the paper feeding tray and contacts with two parallel sides of the second paper, the paper guiding module drives the contact element to move at the same time, so that the contact element contacts with the second conductor sections of the first conductor portion, and the contact element contacts with the second conductor portion, so that the second fixed resistor correspondingly connected to the second conductor sections generates the second resistance value, and further the circuit board outputs the second sensing signal, the control unit receives the second sensing signal to obtain the distance between the two parallel sides of the second paper, the first resistance value and the second resistance value are not equal to each other, and the distance between the two parallel sides of the first paper and the distance between the two parallel sides of the second paper are not equal to each other.
In an embodiment of the invention, the paper guide module includes a first guide rack, a second guide rack, and a circular gear, the first guide rack and the second guide rack are parallel to each other, the circular gear is engaged between the first guide rack and the second guide rack, when the first guide rack moves in a first linear direction, the first guide rack drives the circular gear to rotate, and the second guide rack moves linearly in a second linear direction opposite to the first linear direction according to the rotation of the circular gear.
In an embodiment of the invention, the first guide rack, the second guide rack and the circular gear are arranged along a first axial direction, the first guide rack and the second guide rack extend along a second axial direction, the first guide rack and the circuit board are arranged along a third axial direction, the first axial direction, the second axial direction and the third axial direction are perpendicular to each other, and a gap is formed between the first guide rack and the circuit board in the third axial direction.
In an embodiment of the invention, the contact element is connected to the first guiding rack, and when the first guiding rack moves in the first linear direction, the first guiding rack drives the contact element to move in the first linear direction.
In an embodiment of the invention, an arrangement direction of the conductor segments of the first conductor portion is parallel to the first linear direction, an extension direction of the second conductor portion is parallel to the first linear direction, and the extension direction and the arrangement direction are parallel to each other.
In an embodiment of the invention, the paper guiding module further includes a first paper guiding portion and a second paper guiding portion, the first paper guiding portion is connected to the first guiding rack and located at one end of the paper feeding tray, the second paper guiding portion is connected to the second guiding rack and located at the opposite end of the paper feeding tray, when the first guiding rack moves in the first linear direction, the first guiding rack drives the first paper guiding portion to move in the first linear direction relative to the paper feeding tray, and when the second guiding rack moves in the second linear direction, the second guiding rack drives the second paper guiding portion to move in the second linear direction relative to the paper feeding tray, so that the first paper guiding portion and the second paper guiding portion move in directions close to each other and contact with two parallel sides of the first paper.
In an embodiment of the invention, the contact element includes a first pin and a second pin, the first pin and the second pin are respectively bent toward a direction close to the circuit board, and when the paper guide module moves toward the opposite paper feeding tray and contacts two parallel sides of the first paper, the paper guide module simultaneously drives the contact element to move, so that the first pin contacts the first conductor section of the conductor sections of the first conductor portion, and the second pin contacts the second conductor portion.
In an embodiment of the invention, the contact element is an elastic body, and the first pin and the second pin are respectively abutted against the first conductor section and the second conductor section of the conductor sections of the first conductor portion by an elastic restoring force of the elastic body.
In an embodiment of the invention, the control unit includes an analog-to-digital converter for converting the first sensing signal into a digital signal.
In the paper size sensing device according to the embodiment of the invention, the contact element is driven to move relative to the circuit board in the process that the paper guide module moves relative to the paper feeding tray and contacts with the two parallel sides of the paper, the contact element is contacted with any conductor section of the first conductor part, and meanwhile, the contact element is contacted with the second conductor part, so that the corresponding connected fixed resistor generates a corresponding resistance value, and the control unit obtains the distance between the two parallel sides of the paper (the size of the paper) according to the resistance value. Furthermore, the contact element connected to the paper guide module can contact different conductor sections on the first conductor part because the paper guide module moves to different positions relative to the paper feeding tray, so that the fixed resistors correspondingly connected generate different resistance values. In addition, the sensing module of the embodiment of the invention is composed of the contact element (the metal elastic body) and the circuit board, only the first conductor part, the second conductor part and a small amount of fixed resistors are arranged on the circuit board, the structure is simple, the assembly can be accurately positioned and assembled without an additional jig in the assembly process, and the complicated correction and adjustment are not needed after the assembly is finished, so that the manufacturing cost is effectively reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic structural diagram of a paper size sensing device disposed on a paper feeding tray of a paper feeding device according to an embodiment of the invention.
Fig. 2 is a schematic bottom view of the paper size sensing apparatus shown in fig. 1.
Fig. 3 is an enlarged side view of a partial region B shown in fig. 2.
Fig. 4 is a detailed structure diagram of the circuit board shown in fig. 2.
Fig. 5 is a schematic circuit block diagram of the paper sheet sensing apparatus shown in fig. 2.
The reference numbers are as follows:
1: paper sensing device
11: paper guide module
12: sensing module
13: control unit
111: first guide rack
112: second guide rack
113: circular gear
114: a first paper guide part
115: a second paper guide part
121: contact element
122: circuit board
130: analog/digital converter
1211: first pin
1212: second connecting pin
1221: a first conductor part
1222: second conductor part
2: paper feeding device
20: paper feeding tray
B: local area
C1-C12: conductor section
D1: first linear direction
D2: second linear direction
E1, E2, E3, E4: side edge
G: gap
P1: first paper
P2: second paper
R1-R12: fixed resistor
S1: a first sensing signal
S2: the second sensing signal
V: over pressure
X: first axial direction
Y: second axial direction
Z: third axial direction
Detailed Description
Referring to fig. 1 to 5, fig. 1 is a schematic structural view illustrating a paper feeding tray of a paper feeding device configured with a paper size sensing device according to an embodiment of the invention. Fig. 2 is a schematic bottom view of the paper size sensing apparatus shown in fig. 1. Fig. 3 is an enlarged side view of a partial region B shown in fig. 2. Fig. 4 is a detailed structure diagram of the circuit board shown in fig. 2. Fig. 5 is a schematic circuit block diagram of the paper sheet sensing apparatus shown in fig. 2. It should be noted that, in order to clearly illustrate the structure of the sheet sensing device 1, the sheet feeding tray 20 of the sheet feeding device 2 shown in fig. 1 is omitted from a part of the housing, and in fig. 2, all the components of the sheet feeding tray 20 are omitted.
As shown in fig. 1 to 5, the paper size sensing apparatus 1 of the present embodiment includes a paper guide module 11, a sensing module 12, and a control unit 13. The paper guide module 11 is disposed on the paper feeding tray 20 of the paper feeding device 2, and the paper guide module 11 is movable relative to the paper feeding tray 20. The sensing module 12 is disposed on the paper feeding tray 20. The sensing module 12 includes a contact element 121 and a circuit board 122. The contact element 121 is connected to the paper guide module 11. The circuit board 122 includes a first conductor portion 1221, a second conductor portion 1222, and a plurality of fixed resistors R1 to R12. The first conductor 1221 includes a plurality of conductor segments C1 to C12 arranged at intervals, and the conductor segments C1 to C12 are connected to the fixed resistors R1 to R12, respectively.
When a user places the paper P1 on the paper feeding tray 20, the user can push the paper guiding module 11 to move relative to the paper feeding tray 20 to contact the two parallel sides E1 and E2 of the first paper P1, at this time, the paper guiding module 11 drives the contact element 121 to move at the same time, so that the contact element 121 contacts the first conductor section C1 of the first conductor portion 1221, and the contact element 121 contacts the second conductor portion 1222, and when the first conductor section C1 and the second conductor portion 1222 are conducted by the contact element 121, a first resistance value is generated corresponding to the fixed resistor R1 connected to the first conductor section C1, so that the circuit board 122 outputs a first sensing signal S1 to the control unit 13. The control unit 13 receives the first sensing signal S1 from the circuit board 122 to obtain the distance between the two parallel sides E1 and E2 of the paper P1.
When a user places the paper P2 on the paper feeding tray 20, the user can push the paper guiding module 11 to move relative to the paper feeding tray 20 to contact the two parallel sides E3 and E4 of the first paper P2, at this time, the paper guiding module 11 drives the contact element 121 to move at the same time, so that the contact element 121 contacts the fourth conductor section C4 of the first conductor portion 1221, and the contact element 121 contacts the second conductor portion 1222, and when the fourth conductor section C4 and the second conductor portion 1222 are conducted by the contact element 121, a second resistance value is generated corresponding to the fixed resistor R4 connected to the fourth conductor section C4, so that the circuit board 122 outputs a second sensing signal S2 to the control unit 13. The control unit 13 receives the second sensing signal S2 from the circuit board 122 to obtain the distance between the two parallel sides E3 and E4 of the paper P2. The first resistance value generated by the fixed resistor R1 and the second resistance value generated by the fixed resistor R4 are not equal to each other, and the distance between the two parallel sides E1 and E2 of the first paper P1 and the distance between the two parallel sides E3 and E4 of the second paper P2 are not equal to each other.
It should be noted that, in the paper size sensing device 1 of the present invention, after any one of the conductor segments and the second conductor portion 1222 is conducted by the contact element 121, the fixed resistor corresponding to the conductor segment generates a resistance value, and with such a structural design, the contact element 121 moves to different conductor segments, so that the corresponding fixed resistor generates a stable and accurate resistance value, and the control unit 13 does not make a false determination. If the variable resistors are formed by changing the conductor segments C1 to C12 of the first conductor 1221 to printed carbon films, different resistance values may occur in the same conductor segment, and eventually, the control unit 13 may make a false determination.
The detailed structure of the paper size sensing device 1 according to the embodiment of the present invention will be further described below.
As shown in fig. 1 to 2, the paper guide module 11 of the present embodiment includes a first guide rack 111, a second guide rack 112, and a circular gear 113. The first and second guide racks 111 and 112 are parallel to each other, and the circular gear 113 is engaged between the first and second guide racks 111 and 112. When the first guide rack 111 moves in the first linear direction D1, the circular gear 113 is rotated by the first guide rack 111, and the second guide rack 112 moves in the second linear direction D2 opposite to the first linear direction D1 according to the rotation of the circular gear 113, that is, the first guide rack 111 and the second guide rack 112 move synchronously and oppositely.
As shown in fig. 1 and fig. 2, the paper guide module 11 of the present embodiment further includes a first paper guide 114 and a second paper guide 115. The first paper guide 114 is connected to the first guide rack 111 and located at one end of the paper feeding tray 20, the second paper guide 115 is connected to the second guide rack 112 and located at the opposite end of the paper feeding tray 20, and a contact surface of the first paper guide 114 contacting the paper and a contact surface of the second paper guide contacting the paper are opposite to each other. In the present embodiment, when the first guide rack 111 moves in the first linear direction D1, the first guide rack 111 drives the first paper guide 114 to move in the first linear direction D1 relative to the paper feeding tray 20; when the second guide rack 112 moves in the second linear direction D2, the second guide rack 112 drives the second paper guide 115 to move in the second linear direction D2 relative to the paper feeding tray 20, so that the first paper guide 114 and the second paper guide 115 move in a direction approaching each other to contact with the two parallel sides E1 and E2 of the first paper P1 or the two parallel sides E3 and E4 of the second paper P2.
As shown in fig. 1 to fig. 3, the contact element 121 of the present embodiment is connected to the first guide rack 111, and the contact element 121 includes a first pin 1211 and a second pin 1212. The first pin 1211 and the second pin 1212 are respectively bent toward a direction close to the circuit board 122, such that the first pin 1211 contacts the first conductor portion 1221 of the circuit board 122, and the second pin 1212 contacts the second conductor portion 1222 of the circuit board 122. In the present embodiment, when the first paper guide 114 and the second paper guide 115 of the paper guide module 11 move toward each other to contact the two parallel sides E1 and E2 of the first paper P1, the first guide rack 111 moves toward the first linear direction D1 to drive the contact element 121 to move toward the first linear direction D1, such that the first pin 1211 contacts the first conductor section C1 of the first conductor 1221, and the second pin 1212 contacts the second conductor 1222. In this embodiment, the contact element 121 is, for example, an elastic body, but the invention is not limited thereto, and the first pin 1211 and the second pin 1212 are respectively and tightly abutted against the first conductor portion 1221 and the second conductor portion 1222 by the elastic restoring force of the elastic body.
As shown in fig. 1 to 3, in the present embodiment, the first guide rack 111, the circular gear 113 and the second guide rack 112 of the paper guide module 11 are sequentially arranged along the first axial direction X, the first guide rack 111 and the second guide rack 112 extend along a second axial direction Y, respectively, and the first guide rack 111 and the circuit board 122 are arranged along a third axial direction Z, wherein the first axial direction X, the second axial direction Y and the third axial direction Z are perpendicular to each other, and a gap G exists between the first guide rack 111 and the circuit board 122 in the third axial direction Z, that is, the first guide rack 111 and the circuit board 122 are not located on the same horizontal plane, when the first guiding rack 111 moves in the first linear direction D1 to bring the contact element 121 into contact with the first conductor portion 1221 and the second conductor portion 1222, a portion of the first guiding rack 111 overlaps with the circuit board 122.
As shown in fig. 2 and 4, in the present embodiment, the second conductor portion 1222 of the circuit board 122 is, for example, in an elongated configuration, the extending direction of the elongated second conductor portion 1222 is parallel to the first linear direction D1 (the moving direction of the first guide rack 111), and the arrangement direction of the conductor segments C1 to C12 of the first conductor portion 1221 of the circuit board 122 is parallel to the first linear direction D1, that is, the conductor segments C1 to C12 form a discontinuous elongated configuration. It should be noted that, the configuration of the second conductor portion 1222 is an elongated configuration, and the configuration of the first conductor portion 1221 is a discontinuous elongated configuration, which is only one embodiment of the present invention, and the present invention is not limited thereto, and in other embodiments, the configuration of the first conductor portion 1221 and the configuration of the second conductor portion 1222 may be changed correspondingly according to different operation modes of the guiding module 11.
As shown in fig. 5, when the first pin 1211 contacts any one of the conductor sections of the first conductor portion 1221 and the second pin 1212 contacts the second conductor portion 122, the fixed resistance corresponding to any one of the conductor sections generates a corresponding resistance value, so that the circuit board 122 outputs a corresponding sensing signal (such as the first sensing signal S1 or the second sensing signal S2) to the control unit 13. In the embodiment, the sensing signal is a voltage value, so that the first pin 1211 contacts different conductor sections to generate different resistance values of the corresponding fixed resistors, and a resistor (not shown) in the control unit 13 and the circuit board 122 form a voltage division loop, so that the circuit board 122 outputs different voltage values, and at this time, the control unit 13 receives the voltage value to determine the conductor section contacted by the first pin 1211, so as to obtain the moving distance of the first guide rack 111 and the second guide rack 112 moving in the opposite direction, thereby obtaining the distance between the two parallel sides of any paper. In addition, the control unit 13 of the present embodiment includes an analog/digital converter 130 for converting the different voltage values (sensing signals) into digital signals.
In summary, in the paper size sensing apparatus according to the embodiment of the invention, the contact element is driven to move relative to the circuit board in the process that the paper guide module moves relative to the paper feeding tray and contacts with the two parallel sides of the paper, and the contact element contacts with any one of the conductor sections of the first conductor part and the second conductor part, so that the corresponding fixed resistor generates a corresponding resistance value, and the control unit obtains the distance (the size of the paper) between the two parallel sides of the paper according to the resistance value. Furthermore, the contact element connected to the paper guide module can contact different conductor sections on the first conductor part because the paper guide module moves to different positions relative to the paper feeding tray, so that the fixed resistors correspondingly connected generate different resistance values. In addition, the sensing module of the embodiment of the invention is composed of the contact element (the metal elastic body) and the circuit board, only the first conductor part, the second conductor part and a small amount of fixed resistors are arranged on the circuit board, the structure is simple, the assembly can be accurately positioned and assembled without an additional jig in the assembly process, and the complicated correction and adjustment are not needed after the assembly is finished, so that the manufacturing cost is effectively reduced.
However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made by the claims and the description of the present invention are still within the scope of the present invention. Moreover, not all objects or advantages or features disclosed herein are necessarily achieved by any one embodiment or claim of the invention. In addition, the abstract section and the title are provided for assisting the search of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like in the description or in the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.
Claims (10)
1. A paper size sensing device applied to a paper feeding tray of a paper feeding device comprises:
a paper guide module configured on the paper feeding tray and capable of moving relative to the paper feeding tray;
a sensing module disposed on the paper feeding tray, the sensing module comprising:
a contact element connected to the paper guide module; and
a circuit board, including a first conductor portion, a second conductor portion and a plurality of fixed resistors, the first conductor portion includes a plurality of conductor sections arranged at intervals, the plurality of conductor sections are respectively and correspondingly connected to the plurality of fixed resistors, when the paper guide module moves relative to the paper feeding tray and contacts with two parallel sides of a first paper, the paper guide module simultaneously drives the contact element to move, so that the contact element contacts with a first conductor section of the plurality of conductor sections of the first conductor portion, and the contact element contacts with the second conductor portion, so that a first fixed resistor correspondingly connected to the first conductor section generates a first resistance value, and the circuit board outputs a first sensing signal; and
and the control unit is used for receiving the first sensing signal to obtain the distance between the two parallel side edges of the first paper.
2. The paper size sensing device of claim 1, wherein when the paper guide module moves relative to the paper feeding tray to contact two parallel sides of a second paper, the paper guide module drives the contact element to move at the same time, so that the contact element is contacted with a second conductor section of the plurality of conductor sections of the first conductor part, and contacting the contact element with the second conductor portion to generate a second resistance value corresponding to a second fixed resistor connected to the second conductor portion, so that the circuit board outputs a second sensing signal, the control unit receives the second sensing signal to obtain the distance between two parallel sides of the second paper, the first resistance value and the second resistance value are not equal to each other, and the distance between the two parallel sides of the first paper and the distance between the two parallel sides of the second paper are not equal to each other.
3. The paper size sensing device of claim 1, wherein the paper guide module includes a first guide rack, a second guide rack, and a circular gear, the first guide rack and the second guide rack are parallel to each other, the circular gear is engaged between the first guide rack and the second guide rack, the first guide rack rotates the circular gear when the first guide rack moves in a first linear direction, and the second guide rack moves linearly in a second linear direction opposite to the first linear direction according to the rotation of the circular gear.
4. The paper size sensing device according to claim 3, wherein the first guide rack, the second guide rack, and the circular gear are arranged along a first axis, the first guide rack and the second guide rack extend along a second axis, respectively, the first guide rack and the circuit board are arranged along a third axis, the first axis, the second axis, and the third axis are perpendicular to each other, and a gap is provided between the first guide rack and the circuit board in the third axis.
5. The paper size sensing device of claim 3, wherein the contact member is coupled to the first guide rack, and when the first guide rack moves in the first linear direction, the first guide rack drives the contact member to move in the first linear direction.
6. The sheet size sensing device according to claim 3, wherein an arrangement direction of the plurality of conductor segments of the first conductor portion is parallel to the first linear direction, an extension direction of the second conductor portion is parallel to the first linear direction, and the extension direction and the arrangement direction are parallel to each other.
7. The paper size sensing device as claimed in claim 3, wherein the paper guiding module further comprises a first paper guiding portion and a second paper guiding portion, the first paper guiding portion is connected to the first guiding rack and located at one end of the paper feeding tray, the second paper guiding portion is connected to the second guiding rack and located at the opposite end of the paper feeding tray, when the first guiding rack moves in the first linear direction, the first guiding rack drives the first paper guiding portion to move in the first linear direction relative to the paper feeding tray, and when the second guiding rack moves in the second linear direction, the second guiding rack drives the second paper guiding portion to move in the second linear direction relative to the paper feeding tray, such that the first paper guiding portion and the second paper guiding portion move in a direction close to each other and contact with two parallel sides of the first paper.
8. The paper size sensing device as claimed in claim 1, wherein the contact element includes a first pin and a second pin, the first pin and the second pin are respectively bent toward a direction close to the circuit board, when the paper guiding module moves toward the paper feeding tray and contacts two parallel sides of the first paper, the paper guiding module drives the contact element to move, so that the first pin contacts the first conductor section of the plurality of conductor sections of the first conductor portion, and the second pin contacts the second conductor portion.
9. The paper size sensing device of claim 7, wherein the contact element is an elastic body, and the first pin and the second pin are respectively abutted against the first conductor segment and the second conductor segment of the plurality of conductor segments of the first conductor portion by an elastic restoring force of the elastic body.
10. The sheet size sensing apparatus according to claim 1, wherein the control unit includes an analog/digital converter for converting the first sensing signal into a digital signal.
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| CN201911156325.8A CN112833759B (en) | 2019-11-22 | 2019-11-22 | Paper size sensing device |
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| CN201911156325.8A CN112833759B (en) | 2019-11-22 | 2019-11-22 | Paper size sensing device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003026338A (en) * | 2001-07-12 | 2003-01-29 | Konica Corp | Sheet size detector, image forming apparatus, and method for detecting size of different series sheet |
| CN101162140A (en) * | 2006-10-13 | 2008-04-16 | 虹光精密工业（苏州）有限公司 | Paper size feeler mechanism for image scanner |
| US20110127714A1 (en) * | 2009-11-27 | 2011-06-02 | Primax Electronics Ltd. | Sheet size detecting mechanism for use in automatic document feeder |
| CN104692182A (en) * | 2013-12-09 | 2015-06-10 | 东友科技股份有限公司 | Paper size detection device and detection method thereof |
| JP2016185848A (en) * | 2015-03-27 | 2016-10-27 | カシオ計算機株式会社 | Paper feeding device and image forming apparatus |
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2019
- 2019-11-22 CN CN201911156325.8A patent/CN112833759B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003026338A (en) * | 2001-07-12 | 2003-01-29 | Konica Corp | Sheet size detector, image forming apparatus, and method for detecting size of different series sheet |
| CN101162140A (en) * | 2006-10-13 | 2008-04-16 | 虹光精密工业（苏州）有限公司 | Paper size feeler mechanism for image scanner |
| US20110127714A1 (en) * | 2009-11-27 | 2011-06-02 | Primax Electronics Ltd. | Sheet size detecting mechanism for use in automatic document feeder |
| CN104692182A (en) * | 2013-12-09 | 2015-06-10 | 东友科技股份有限公司 | Paper size detection device and detection method thereof |
| JP2016185848A (en) * | 2015-03-27 | 2016-10-27 | カシオ計算機株式会社 | Paper feeding device and image forming apparatus |
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| CN112833759B (en) | 2022-11-29 |
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