CN201140942Y - Paper taking and separating mechanism of automatic paper feeder - Google Patents

Abstract

The utility model provides an automatic paper feeder get paper and divide paper mechanism, it includes one and gets paper gyro wheel and an elastic arm casting die. The elastic arm pressing piece is provided with two side elastic arms and a middle elastic arm, the tail ends of the two side elastic arms are pressed against the surface of the paper taking roller, the middle elastic arm is positioned between the two side elastic arms, and the tail ends of the middle elastic arm are close to the surface of the paper taking roller. The utility model discloses in automatic paper feeder's the paper of getting and dividing the paper mechanism, middle bullet arm only presses the paper when the paper gets into in large quantity, consequently can improve and get paper and divide the paper performance.

Description

Paper pick-up and paper-separation mechanism of automatic document feeder

technical field

The utility model relates to an automatic paper feeder, in particular to a paper fetching and paper separating mechanism of the automatic paper feeder.

Background technique

Automatic document feeders are widely used in office equipment such as printers, copiers, scanners, and multifunctional office machines, which can feed paper in a paper tray into the office equipment. In order to prevent two or more sheets of paper from entering the office equipment at the same time, the automatic document feeder is usually equipped with a paper picking and paper separating mechanism.

Please refer to FIG. 1 , a conventional paper-feeding and paper-separating mechanism of an automatic document feeder includes a paper-feeding roller 120 and an elastic arm pressing member 160 . Two sides of the spring arm pressing part 160 respectively have one side spring arms 161 . When the paper is not picked up, the end of the side elastic arm 161 is pressed against the surface of the paper pickup roller 120; The elastic arm 161 exerts a pressure on the paper, and the pressure is transmitted from the paper to the paper pickup roller 120 , so that a frictional force is generated between the paper pickup roller 120 and the paper, and thus the paper pickup roller 120 drives the paper to move.

However, in the paper picking and paper separating mechanism of the above-mentioned automatic document feeder, if the end of the side elastic arm 161 presses against the surface of the paper picking roller 120 with a large force, a small amount of paper will be difficult to be pushed up by the edge due to the small rigidity. The side elastic arm 161 enters between the side elastic arm 161 and the paper pickup roller 120; if the force of the end of the side elastic arm 161 against the surface of the paper pickup roller 120 is small, when multiple sheets of paper are stacked and enter the side elastic arm 161 and the paper pickup roller 120 When between the rollers 120, it is difficult for the paper-fetching roller 120 to generate enough friction to push the paper forward, so that it is difficult to realize paper-fetching. In this way, it is difficult to grasp the force with which the end of the side elastic arm 161 presses against the surface of the paper pickup roller 120, so that it is difficult to realize proper paper pickup and paper separation.

Therefore, it is necessary to develop a paper-feeding and paper-separating mechanism of an automatic paper feeder that can improve the paper-feeding and paper-separating performance to solve the above-mentioned defects of the existing paper-feeding and paper-separating mechanisms of the automatic paper feeder.

Contents of the invention

The purpose of this utility model is to provide a paper-feeding and paper-separating mechanism of an automatic paper feeder that can improve the paper-feeding and paper-separating performance in view of the defects in the above-mentioned background technology.

In order to achieve the above object, the paper-feeding and paper-separating mechanism of the automatic paper feeder provided by the utility model includes a paper-fetching roller and an elastic arm pressing piece, and the elastic arm pressing piece has two side elastic arms, and the two side The end of the elastic arm presses against the surface of the paper picking roller, and the elastic arm pressing part is provided with a middle elastic arm between the two side elastic arms, and the end of the middle elastic arm is close to the surface of the paper picking roller. From the above, the beneficial technical effect of the paper-feeding and paper-separating mechanism of the automatic paper feeder of the present invention is that when a small amount of paper enters, the paper is pushed up by the side elastic arm from the edge and enters between the side elastic arm and the paper-fetching roller. , the paper will not touch the middle elastic arm; when more paper enters between the side elastic arm and the pickup roller, the side elastic arm will swing a lot, so that the end of the middle elastic arm will touch the paper and bounce with the side elastic arm. The arms exert pressure on the paper together, so that sufficient friction can be generated between the paper pickup roller and the paper and the paper can be pushed to move, so as to realize the paper pickup; thus, the paper pickup of the automatic document feeder and the paper pickup of the paper separation mechanism can be improved and paper separation performance.

Description of drawings

Fig. 1 is the perspective view of the paper-fetching and paper-separating mechanism of the prior art;

Fig. 2 is a perspective view of the paper taking and paper separating mechanism of the utility model;

Fig. 3 is a three-dimensional exploded view of the paper fetching and paper separating mechanism shown in Fig. 2;

Fig. 4 is a perspective view of the support of the paper fetching and paper separating mechanism shown in Fig. 2;

Fig. 5 is a perspective view of the elastic arm pressing part of the paper fetching and paper separating mechanism shown in Fig. 2;

Fig. 6 is a perspective view of the friction plate of the paper fetching and paper separating mechanism shown in Fig. 2;

Fig. 7 is a perspective view of another angle of the friction plate of the paper fetching and paper separating mechanism shown in Fig. 2;

Fig. 8 is a perspective view of the torsion spring of the paper fetching and paper separating mechanism shown in Fig. 2 in a torsional deformation state;

Fig. 9 is a perspective view of another angle of the paper fetching and paper separating mechanism shown in Fig. 2;

Fig. 10 is a side view of the paper fetching and paper separating mechanism shown in Fig. 2 .

Wherein, the reference signs are explained as follows:

10 Paper picking and separating mechanism of automatic document feeder

200 paper pickup roller 300 bracket

310 bearing plate 311 fixed column

312 Block 314 Clamping Groove

316 limit block 320 abutment plate

322 saving trough 324 fixed plate

326 friction plate fixing column 330 fixed part

340 buckle part 400 elastic arm pressure piece

410 holding part 411 holding hole

412 clamping part 414 elastic arm support part

416 middle spring arm 418 side spring arm

500 cardboard 510 paper stop

520 paper protection department 600 friction plate

610 first friction part 620 second friction part

622 slope surface 630 anti-wrinkle groove

640 friction plate fixing part 642 engagement groove

644 fixing hole 650 bending groove

700 pressure block 710 top plate

720 Pivot Arm 722 Pivot

800 torsion spring 810 torsion spring body

812 clamping arm 816 pressing part

120 paper pickup roller 160 elastic arm press

161 side spring arm

Detailed ways

In order to describe the technical content, the achieved purpose and the effect of the present utility model in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

For the convenience of description, in this embodiment, the moving direction of the paper is defined as the front, and the up and down directions in this embodiment are as shown in FIG. 2 .

Please refer to Fig. 2 and Fig. 3, the paper fetching and paper separating mechanism 10 of the automatic paper feeder of the present utility model includes a paper fetching roller 200, a bracket 300, an elastic arm pressing part 400, a cardboard guard 500, and a friction plate 600 , a pressing block 700 and a torsion spring 800.

Please refer to FIG. 3 and FIG. 4 in conjunction with FIG. 2 , the bracket 300 is placed above the paper pickup roller 200 and has a plate-shaped bearing plate 310 . A cylindrical fixing post 311 and a strip-shaped stopper 312 protrude vertically from the upper surface of the supporting board 310 . Two fixing portions 330 are respectively disposed on two sides of the front end of the supporting board 310 . A front side edge of the supporting board 310 protrudes downwards at a middle to form an abutting board 320 . Two material-saving grooves 322 are provided at the connection between the abutting plate 320 and the supporting plate 310 . The purpose of setting up the material-saving grooves 322 is to prevent the abutting plate 320 from being too thick and wasting raw materials. Two plate-shaped fixing plates 324 protrude downward from the lower surface of the abutting plate 320 , and a friction plate fixing column 326 respectively protrudes from the middle of the front surface of the two fixing plates 324 . The middle part of the rear end of the supporting plate 310 protrudes upwards and is bent to form a fastening part 340. The fastening part 340 and two fixing parts 330 are used to fix the bracket 300 to the cover of the automatic document feeder (not shown in the figure). superior. A clamping groove 314 is defined on both sides of the fastening portion 340 at the rear end of the bearing plate 310 . The bearing plate 310 protrudes downwards from one side of the clamping groove 314 and is bent to form a limiting block 316 .

Please refer to FIG. 3 and FIG. 5 in conjunction with FIG. 2 , the elastic arm pressing member 400 has a rectangular plate-shaped holding portion 410 , and a circular holding hole 411 is defined on the holding portion 410 . The holding portion 410 is disposed on the supporting plate 310 of the bracket 300 , and the holding hole 411 is sleeved on the fixing column 311 of the supporting plate 310 . Two sides of one end of the holding portion 410 are respectively extended and bent to form a holding portion 412 , and the holding portion 412 is accommodated in the holding groove 314 of the supporting board 310 . The limiting block 316 of the supporting plate 310 is used to limit elastic deformation of the clamping portion 412 . The ends of the two clamping parts 412 extend inward and forward respectively and are connected together to form an elastic arm support part 414. The middle part of the elastic arm support part 414 protrudes to form an intermediate elastic arm 416. The end of the intermediate elastic arm 416 is close to the The surface of the paper roller 200. The two ends of the front edge of the elastic arm support part 414 respectively extend and bend to form a side elastic arm 418 , and the ends of the two side elastic arms 418 are bent into a hook shape, and the ends thereof are pressed against the pickup roller 200 On the surface.

Please refer to FIG. 3 , the paper guard 500 has a plate-shaped paper retaining portion 510 and a paper retaining portion 520 bent and extended from the paper retaining portion 510 . The paper blocking portion 510 is fixed on the back of the support plate 320 of the support 300 . The paper protecting portion 520 has a certain distance from the paper picking roller 200 and is located in front of the side elastic arm 418 .

Please refer to Fig. 3, Fig. 6 and Fig. 7 in conjunction with Fig. 2, the friction plate 600 is placed in front of the paper guard 500, and the coefficient of friction between it and the paper is usually greater than the coefficient of friction between the paper and the paper, but smaller than that between the paper and the paper. The coefficient of friction between the rollers 200. The friction plate 600 has a first friction part 610, the front end of the first friction part 610 is pressed against the paper pickup roller 200, and a C area is formed between the rear part of the first friction part 610 and the paper pickup roller 200 (as shown 10). There is a triangular anti-wrinkle groove 630 in the middle of the front end of the first friction part 610; the two sides of the anti-wrinkle groove 630 can generate outward thrust on the paper, so as to stretch the paper to avoid being crumpled when the middle part of the paper is arched. The rear part of the first friction part 610 protrudes downward to form a second friction part 620, the front part of the second friction part 620 is stepped, and the rear part of the second friction part 620 has a slope surface 622; The part 620 is pressed against the paper pickup roller 200, and a B zone (as shown in FIG. 10 ) is formed between its slope surface 622 and the surface of the paper pickup roller 200. The maximum height of the B zone is approximately equivalent to 10 sheets with a specification of 70 The total thickness of the paper in grams per square meter. The upper surface of the rear part of the friction plate 600 is provided with a substantially rectangular bending groove 650, which can improve the elasticity of the friction plate 600 so that the first friction part 610 can better abut against the paper pickup roller 200. on the outside. A friction plate fixing portion 640 protrudes upward from the rear of the friction plate 600, and two engaging grooves 642 are opened on the friction plate fixing portion 640, and a fixing hole 644 is formed on the side wall of the engaging groove 642 close to the bending groove 650 . The two fixing plates 324 of the bracket 300 are correspondingly engaged in an engaging groove 642 , and the two friction plate fixing columns 326 are respectively sleeved in a fixing hole 644 to fix the friction plate 600 on the bracket 300 .

Please refer to FIG. 3 in conjunction with FIG. 2 , the resisting block 700 has a rectangular top plate 710 , and the lower surface of the top plate 710 presses against the friction plate 600 . Two pivot arms 720 extend obliquely rearwardly from a surface of the top plate 710 , and a pivot 722 protrudes vertically from the ends of the pivot arms 720 , and the pivot 722 is pivotally connected to the cover.

The torsion spring 800 has two helical torsion spring bodies 810 arranged horizontally, the torsion spring bodies 810 are pivotally mounted on the cover, and a "U"-shaped pressing part 816 is connected between the inner ends of the two torsion spring bodies 810. The pressing part 816 is pressed on the cover body; the outer ends of the two torsion spring bodies 810 are extended and bent to form a clamping arm 812, and the two clamping arms 812 are buckled respectively on the corresponding fulcrum arm 720 and the top plate of the pressing block 700 710 Junction.

When the torsion spring 800 is assembled with the paper fetching and paper separating mechanism 10 of the automatic document feeder, the two torsion spring bodies 810 of the torsion spring 800 should be torsionally deformed, so that the clamping arm 812 and the pressing part 816 will be formed as shown in the figure. 8 , the clamping arm 812 makes the top plate 710 press the friction plate 600 , and then makes the first friction part 610 and the second friction part 620 of the friction plate 600 close to the pickup roller 200 .

The paper-taking of the utility model automatic paper feeder and the paper-separating process of the paper-separating mechanism 10 are described in detail below.

Please refer to Fig. 9 and Fig. 10, when a small amount of paper enters, the paper pushes up the side elastic arm 418 by the edge and enters between the side elastic arm 418 and the paper pickup roller 200, and the paper will not touch the middle elastic arm 416; When the paper enters between the side elastic arm 418 and the pick-up roller 200, the side elastic arm 418 will swing greatly, so that the end of the middle elastic arm 416 will contact the paper and apply pressure to the paper together with the side elastic arm 418, and then The paper pickup roller 200 can generate sufficient frictional force on the paper to push the paper forward, so as to realize paper pickup.

When the paper pickup roller 200 drives the paper to move to the paper protection part 520 of the paper protection board 500 , the paper protection part 520 can press the paper to prevent the paper from being damaged due to curling. When the front end of more paper moves to the second friction part 620 of the friction plate 600, that is, when it enters the B area, the second friction part 620 will utilize the blocking force of the slope surface 622 to the paper and the second friction part 620 to the paper. Friction is used to separate the paper for the first time, so that only 1 to 3 papers enter the C area.

When the pick-up roller 200 picks up paper from area C where more than 2 sheets of paper are stacked, the first friction part 610 of the friction plate 600 will use its blocking force and friction to the paper to separate the paper for the second time, thereby better Ensure that only a piece of paper that is close to the paper pickup roller 200 enters the office equipment.

From the above, in the paper fetching and paper separating mechanism 10 of the automatic paper feeder of the present invention, when a small amount of paper enters, the paper pushes up the side elastic arm 418 from the edge and enters between the side elastic arm 418 and the paper pickup roller 200. During this period, the paper will not touch the middle elastic arm 416; when more paper enters between the side elastic arm 418 and the paper pickup roller 200, the side elastic arm 418 will swing greatly, so that the end of the middle elastic arm 416 will be Contact the paper and exert pressure on the paper together with the side elastic arm 418, thereby generating sufficient friction between the paper pickup roller 200 and the paper and pushing the paper to move, thereby realizing paper pickup, which can improve the pickup efficiency of the automatic document feeder. The paper taking and paper separating performance of the paper and paper separating mechanism 10.

In addition, since the middle elastic arm 416 in the middle of the two side elastic arms 418 also exerts force on the paper surface of the paper in addition to the two side elastic arms 418 exerting force on the paper when multiple papers are stacked and fed, it can also avoid the paper The center is puckered with arching.

Claims (9)

1. A paper-fetching and paper-separating mechanism of an automatic document feeder, comprising a paper-fetching roller and an elastic arm pressing piece, the elastic arm pressing piece has two side elastic arms, and the ends of the two side elastic arms press Arresting against the surface of the paper pickup roller, the feature is that the spring arm pressing part is provided with a middle spring arm between the two side spring arms, and the end of the middle spring arm is close to the surface of the paper pickup roller. 2. The paper-feeding and paper-separating mechanism of the automatic document feeder according to claim 1, characterized in that: the paper-feeding and paper-separating mechanism of the automatic document feeder also includes a bracket, and the bracket is arranged on the paper-feeding roller There is a bearing plate on the upper side, and the elastic arm pressing piece has a holding part, and the holding part is fixed on the bearing plate. 3. The paper fetching and paper separating mechanism of the automatic document feeder according to claim 2, characterized in that: the two sides of one end of the holding part respectively extend and bend to form a holding part, and the two holding parts The ends of the parts extend inward and forward and are connected together to form a spring arm support part. The two side spring arms and the middle spring arm are formed by bending and extending the spring arm support part. 4. The paper fetching and paper separating mechanism of the automatic document feeder according to claim 2, characterized in that: the paper fetching and paper separating mechanism of the automatic document feeder also includes a friction plate, and the friction plate has a first As for the friction part, one end of the first friction part protrudes downward to form a second friction part, and both the first friction part and the second friction part press against the paper pickup roller. 5 . The paper fetching and paper separating mechanism of the automatic document feeder according to claim 4 , wherein an anti-wrinkle groove is formed in the middle of one end of the first friction part of the friction plate. 5 . 6. The paper fetching and paper separating mechanism of the automatic document feeder according to claim 4, characterized in that: the second friction part has a slope surface, and the slope surface forms a maximum height with the surface of the paper fetching roller A space equivalent to the total thickness of 10 sheets of paper with a specification of 70 g/m2. 7 . The paper fetching and paper separating mechanism of the automatic document feeder according to claim 4 , wherein a bending groove is provided at the rear of the friction plate. 8 . 8. The paper fetching and paper separating mechanism of the automatic document feeder according to claim 4, characterized in that: one side edge of the carrying plate protrudes downwards to form an abutment plate, and the abutment plate protrudes downwards There are two fixing plates protruding from the two fixing plates, and a friction plate fixing column protrudes from the two fixing plates; a friction plate fixing part protrudes upward from the side of the bending groove, and the friction plate fixing part is provided with two Buckle groove, the side walls of the two buckle grooves close to the bending groove are provided with a fixing hole, and the two fixing plates of the bracket are correspondingly engaged in a buckle groove, and the two frictions of the bracket The plate fixing columns are correspondingly sleeved in a fixing hole of the friction plate fixing portion. 9. The paper fetching and paper separating mechanism of the automatic document feeder according to claim 4, characterized in that: the end of the side elastic arm is bent into a hook shape.

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