Image reading apparatus

Abstract

The utility model discloses an image reading device. The image reading device comprises a frame; the first driving wheel and the second driving wheel are rotatably arranged on the frame; the first driven wheel and the second driven wheel are rotatably and horizontally arranged on the frame; the driving assembly is used for outputting transmission force to the first driving wheel; the driving transmission mechanism is connected between the first driving wheel and the second driving wheel; the driven transmission mechanism is connected between the first driven wheel and the second driven wheel; and the first driven wheel and the second driven wheel are in contact with the first driving wheel and the second driving wheel.

Description

Technical Field

[0001] The utility model relates to an image reading device, in particular to an image reading device with a simplified structure and capable of feeding an image medium at a uniform speed. Background Art

[0002] Conventional image reading devices are provided with a paper feeding structure for automatically feeding image media such as paper. The common paper feeding structure includes a paper feeding channel, an image reading unit disposed in the paper feeding channel, and two paper feeding wheel groups disposed upstream and downstream of the image reading unit, respectively.

[0003] As shown in Japanese Patent Publication No. 59-194956, in order to enable the image reading device to correctly read thinner documents and thicker bound booklets, the paper feed wheel group is respectively provided with a feeding wheel and a movable paper pressing wheel. However, when the image medium passes through the movable paper pressing wheel, it is easily affected and cannot pass through at a uniform speed, thereby causing the scanned image to be skewed or jittered. Therefore, in order to improve the stability of the paper feed wheel group when feeding the image medium and reduce the jitter of the scanned image, the feeding wheel and the paper pressing wheel are both connected to the driving motor and actively rotate to feed paper to ensure that the image medium passes at a uniform speed. However, in order to make the feeding wheel and the paper pressing wheel in the two paper feed wheel groups connected to the driving motor to actively rotate, the transmission system of the overall image reading device will be set more complicated. Therefore, it is necessary to provide an image reading device with a simplified structure and capable of feeding the image medium at a uniform speed. Summary of the invention

[0004] The utility model aims to provide an image reading device with a simplified structure and capable of feeding an image medium at a uniform speed.

[0005] To achieve the above-mentioned purpose, the utility model discloses an image reading device, characterized in that it includes: a first frame; a second frame, the second frame is arranged on the first frame; a first driving wheel, rotatably arranged on the first frame; a second driving wheel, rotatably arranged on the first frame; a first driven wheel, rotatably and translatably arranged on the second frame; a second driven wheel, rotatably and translatably arranged on the second frame; a driving component, outputting a transmission force to the first driving wheel; an active transmission mechanism, connected between the first driving wheel and the second driving wheel to output the transmission force to the second driving wheel; a driven transmission mechanism, connected between the first driven wheel and the second driven wheel to synchronize the rotation speeds of the first driven wheel and the second driven wheel; and a reading unit, arranged to read an image on an image medium transmitted by the common rotation of the first driving wheel and the second driving wheel; and wherein the first driven wheel and the second driven wheel are pressed on the first driving wheel and the second driving wheel respectively.

[0006] As a further improvement, it comprises: a first coupling connected between the driven transmission mechanism and the first driven wheel, and a second coupling connected between the driven transmission mechanism and the second driven wheel.

[0007] As a further improvement, the first coupling and the second coupling are configured as flexible couplings.

[0008] As a further improvement, the first driven wheel and the second driven wheel are respectively fixed to the second frame through an elastic support mechanism, and the elastic support mechanism includes: a plurality of slide rail brackets, which are movably mounted on the second frame; a roller shaft, which is mounted on the slide rail bracket and moves with the slide rail bracket; and a plurality of bracket springs arranged between the second frame and the slide rail bracket to push the slide rail bracket toward the first frame.

[0009] As a further improvement, the image reading device further includes a third driving wheel rotatably disposed on the first frame; a third driven wheel rotatably and translationally disposed on the second frame; and wherein the third driving wheel is connected to the driving assembly via the active transmission mechanism, and the third driven wheel is connected to the driven transmission mechanism so that the rotation speed of the third driven wheel is synchronized with the rotation speeds of the first driven wheel and the second driven wheel.

[0010] As a further improvement, the driven transmission mechanism is configured as a transmission belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the image reading device in the utility model;

[0012] Figure 2 It is a three-dimensional diagram of the image reading device in the utility model;

[0013] Figure 3 It is a side view of the active paper feeding wheel and the passive paper feeding wheel in the utility model when feeding paper;

[0014] Figure 4 It is a side view of the active paper feeding wheel and the passive paper feeding wheel in the utility model when feeding books;

[0015] Figure 5 It is a three-dimensional diagram of the active paper feeding wheel in the utility model;

[0016] Figure 6 It is a three-dimensional diagram of the passive paper feeding wheel in the utility model. DETAILED DESCRIPTION

[0017] In order to explain the technical content, structural features, achieved objectives and technical effects of the present invention in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0018] See also Figure 1 and Figure 2 The image reading device 100 of the present invention comprises a frame 10 and a paper feeding channel 11 passing through the frame 10 .

[0019] A first driving wheel 20a, a second driving wheel 20b, and a third driving wheel 20c are provided on the frame 10. The first driving wheel 20a, the second driving wheel 20b, and the third driving wheel 20c are all rotatably disposed on the frame 10 and partially disposed in the paper feeding passage 11 to feed image media such as paper or booklets. A first driven wheel 30a, a second driven wheel 30b, and a third driven wheel 30c are also provided on the frame 10. The first driven wheel 30a, the second driven wheel 30b, and the third driven wheel 30c are all rotatably and translationally disposed on the frame 10 and are aligned with the first driving wheel 20a, the second driving wheel 20b, and the third driving wheel 20c, respectively, so as to press the image medium toward the first driving wheel 20a, the second driving wheel 20b, and the third driving wheel 20c when feeding an image medium.

[0020] Please see again Figure 2 and Figure 5 In the frame 10, a driving assembly 40 is provided, and the driving assembly 40 is configured to output a transmission force; an active transmission mechanism 41, one end of which is connected to the driving assembly 40, and the other end of which is connected to the first driving wheel 20a, the second driving wheel 20b and the third driving wheel 20c to output the transmission force to the first driving wheel 20a, the second driving wheel 20b and the third driving wheel 20c in a balanced manner. Figure 5 In a preferred embodiment shown in FIG, the active transmission mechanism 41 is configured as a gear set composed of a plurality of gears, and transmits a transmission force with the same direction and rotation speed to the first driving wheel 20a, the second driving wheel 20b and the third driving wheel 20c through the gear set.

[0021] Please see again Figure 2 and Figure 6 The frame 10 is also provided with a driven transmission mechanism 50, which is connected between the first driven wheel 30a, the second driven wheel 30b and the third driven wheel 30c to synchronize the rotation speeds of the first driven wheel 30a, the second driven wheel 30b and the third driven wheel 30c. Figure 6In a preferred embodiment shown in , the driven transmission mechanism 50 is configured as a plurality of transmission belts whose ends are respectively assembled between the first driven wheel 30a, the second driven wheel 30b and the third driven wheel 30c, and the transmission belts are used to ensure that the first driven wheel 30a, the second driven wheel 30b and the third driven wheel 30c rotate at the same speed. A reading unit 70 is respectively provided on the upper and lower sides of the paper feeding channel 11 to read an image on an image medium transmitted by the common rotation of the first driving wheel 20a and the second driving wheel 20b.

[0022] Please see again Figures 1 to 4 , through the first driven wheel 30a to the third driven wheel 30c that can translate and rotate relative to the frame 10, the image reading device 100 in the present invention can adapt to a variety of image media of different thicknesses, and through the driven transmission mechanism 50, the first driven wheel 30a to the third driven wheel 30c are kept rotating at the same speed. And the first driven wheel 30a to the third driven wheel 30c are respectively arranged upstream to downstream of the paper feeding channel 11, so when the image medium is fed through the paper feeding channel 11, at least one driven wheel is kept in contact with the corresponding driving wheel, and the driven wheel and the driving wheel are rotated at the same speed to ensure that the image medium always maintains a stable and consistent speed when being fed, so as to avoid skewing or shaking of the scanned image.

[0023] Please see again Figure 6 In order to enable the first driven wheel 30a and the second driven wheel 30b to translate and rotate relative to the second frame 10b at the same time, the image reading device 100 includes: a first coupling 61 connected between the driven transmission mechanism 60 and the first driven wheel 30a, and a second coupling 62 connected between the driven transmission mechanism 60 and the second driven wheel 30b. The first coupling 61 and the second coupling 62 are configured as flexible couplings. And wherein the first driven wheel 30a and the second driven wheel 30b are respectively fixed on the second frame 10b through an elastic support mechanism 80, and the elastic support mechanism 80 includes: a plurality of slide rail brackets 81, the slide rail bracket 81 is movably installed on the second frame 10b; a roller shaft 82, the roller shaft 82 is installed on the slide rail bracket 81 and moves with the slide rail bracket 81; and a plurality of bracket springs 83 arranged between the second frame 10b and the slide rail bracket 81 to push the slide rail bracket 81 toward the direction of the first frame 10a.

[0024] In summary, an image reading device in the present invention includes a frame 10; a first driving wheel 20a; a second driving wheel 20b; a first driven wheel 30a; a second driven wheel 30b; a driving component 40, outputting a transmission force to the first driving wheel 20a; an active transmission mechanism 50, connected between the first driving wheel 20a and the second driving wheel 20b to output the transmission force to the second driving wheel 20b; and a driven transmission mechanism 60, connected between the first driven wheel 30a and the second driven wheel 30b to synchronize the rotation speeds of the first driven wheel 30a and the second driven wheel 30b; through the driven transmission mechanism 60, the first driven wheel 30a and the second driven wheel 30b are kept rotating at the same transmission speed as the first driving wheel 20a and the second driving wheel 20b, thereby achieving an image reading device with a simplified structure and capable of feeding image media at a uniform speed.

Claims

1. An image reading device, characterized in that: The invention comprises: a first frame; a second frame, wherein the second frame is arranged on the first frame; a first driving wheel, rotatably arranged on the first frame; a second driving wheel, rotatably arranged on the first frame; a first driven wheel, rotatably and translatably arranged on the second frame; a second driven wheel, rotatably and translatably arranged on the second frame; a driving component, outputting a transmission force to the first driving wheel; an active transmission mechanism, connected between the first driving wheel and the second driving wheel to output the transmission force to the second driving wheel; a driven transmission mechanism, connected between the first driven wheel and the second driven wheel to synchronize the rotation speeds of the first driven wheel and the second driven wheel; and a reading unit configured to read an image on an image medium transmitted by the common rotation of the first driving wheel and the second driving wheel; and wherein the first driven wheel and the second driven wheel are pressed on the first driving wheel and the second driving wheel respectively.

2. The image reading device according to claim 1, wherein: The invention comprises: a first coupling connected between the driven transmission mechanism and the first driven wheel, and a second coupling connected between the driven transmission mechanism and the second driven wheel.

3. The image reading device according to claim 2, wherein: The first coupling and the second coupling are configured as flexible couplings.

4. The image reading device according to claim 1, wherein: The first driven wheel and the second driven wheel are respectively fixed to the second frame through an elastic support mechanism, and the elastic support mechanism includes: a plurality of slide rail brackets, which are movably installed on the second frame; a roller shaft, which is installed on the slide rail bracket and moves with the slide rail bracket; and a plurality of bracket springs arranged between the second frame and the slide rail bracket to push the slide rail bracket toward the first frame.

5. The image reading device according to claim 1, wherein: The image reading device further includes a third driving wheel rotatably disposed on the first frame; a third driven wheel rotatably and translationally disposed on the second frame; and wherein the third driving wheel is connected to the driving component via the active transmission mechanism, and the third driven wheel is connected to the driven transmission mechanism so that the rotation speed of the third driven wheel is synchronized with the rotation speeds of the first driven wheel and the second driven wheel.

6. The image reading device according to claim 1, wherein: The driven transmission mechanism is configured as a transmission belt.

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