JP3141363U - Paper separation mechanism of automatic paper feeder - Google Patents

Abstract

A paper separation mechanism of an automatic paper feeder with high paper separation accuracy is provided.
A frame assembly is provided, and at least one torsion spring 740 is provided on the frame assembly. The torsion spring 740 is a swing arm 743, a pressing arm 742 that presses the frame assembly, and a torsion spring installed on the frame assembly. Having a body. A pressing plate 710 is pivoted on the swing arm 743, and the pressing plate 710 can rotate in response to the torsion spring 740. The sheet separating mechanism 10 further includes a sheet feeding roller 100 and a separation pad installed between the sheet feeding roller 100 and the pressing plate 710. Since the pressing plate 710 swings itself based on the change in the relative positional relationship with the paper feed roller 100, the paper separation mechanism 10 of the automatic paper feeder of the present invention can reliably separate the paper.
[Selection] Figure 12

Description

The present invention relates to an automatic paper feeder, and more particularly to a paper separation mechanism of an automatic paper feeder.

Automatic paper feeders are widely used in office equipment such as printers, copiers, scanners, and office machines, and feed paper from a paper stacker into the equipment. In order to prevent two or more sheets from entering the apparatus at the same time, the automatic sheet feeder is usually provided with a sheet separation mechanism.

1 and 2 show a sheet separating mechanism of an automatic sheet feeder according to the prior art, which includes a sheet feeding roller 910, a separation pad 920, a pressing portion 930, and a spring 940. The pressing portion 930 has an upper plate 932, and a shaft arm 934 is fixed on the upper plate 932. A pivot 936 is provided on the shaft arm 934, and the pivot 936 is pivoted in a lid (not shown). The spring 940 is supported by the middle portion of the upper plate 932 of the pressing portion 930 and applies pressure to the separation pad 920 from the upper plate 932, and the separation pad 920 is tightly bonded to the paper feed roller 910 by the elasticity of the spring 940. The sheet feeding roller 910 can feed sheets one by one into the apparatus by using a difference in frictional force between the sheet feeding roller 910, a plurality of sheets, and the separation pad 920.

As shown in FIG. 3, when the sheet separating mechanism of the automatic sheet feeder according to the above-described prior art is used, a plurality of sheets 950 exceeding a predetermined thickness are separated into a section A between the separation pad 920 and the sheet feeding roller 910. , The plurality of sheets 950 lifts the separation pad 920, and further the separation pad 920 lifts the pressing portion 930 and rotates the pressing portion 930 counterclockwise, thereby the upper plate 932 of the pressing portion 930. The front portion is in a state of being too far away from the paper feed roller 910 as shown in section B. In addition, a situation in which the front portion of the upper plate 932 is too far from the paper feed roller 910 due to manufacturing errors of the equipment and wear due to use. When the front portion of the upper plate 932 is too far from the paper feed roller 910, the normal frictional force relationship between the paper feed roller 910, the plurality of sheets, and the separation pad 920 is not maintained, and the sheets are not normally separated. A situation occurs in which the automatic paper feeder feeds a plurality of sheets into the apparatus.
JP 2005-194023 A

An object of the present invention is to provide a paper separation mechanism of an automatic paper feeder with high paper separation accuracy.

In order to solve the above-described problems, a separation mechanism of an automatic paper feeder according to the present invention includes a frame assembly, a paper feed roller, a swing arm, a pressing arm that presses the frame assembly, and a torsion spring installed on the frame assembly. And at least one torsion spring having a main body, a pressing plate pivoted on the swing arm, and a separation pad installed between the paper feed roller and the pressing plate.

In the separation mechanism of the automatic paper feeder of the present invention, the pressing plate is pivotally mounted on the swinging arm, and the pressing plate swings based on the change in the relative positional relationship with the paper feeding roller. It can be stuck tightly on the paper roller, maintains a stable positional relationship with the paper feed roller, and also maintains a normal frictional force relationship between the paper feed roller, multiple papers and separation pad, and automatically High sheet separation accuracy of the sheet separation mechanism of the sheet feeder is maintained.

Embodiments showing the objects, features, and effects of the present invention will be described in detail with reference to the drawings.

For convenience of explanation, the paper moving direction in the embodiment of the present invention is the front, and the vertical direction is based on FIG.

As shown in FIGS. 4 to 7, the sheet separating mechanism 10 of the automatic sheet feeder according to the present invention includes a sheet feeding roller 100, a frame assembly, an elastic plate 400, a protection pad 500, a separation pad 600, a pressing plate 710, and a torsion spring. 740.

The frame assembly includes a lid 200 and a frame 300. The lid 200 is covered on a frame 300, and as shown in FIGS. 5 and 6, one surface of the lid 200 close to the frame 300 is a pressing surface 210, and the pressing surface 210 protrudes in two parallel directions. A support block 220 with a space is provided, and both support blocks 220 are provided with convex columns 222 protruding inward.

As shown in FIGS. 4, 7, and 8, the frame 300 is installed above the paper feed roller 100 and has a plate-shaped mounting plate 310. Three fixed columns 311 projecting vertically are provided on the upper surface of the mounting plate 310. A fixing portion 340 extends on both side edges of the mounting plate 310, and an auxiliary portion 350 is formed at the front end of the fixing portion 340 by bending downward. The fixing part 340 and the auxiliary part 350 are each fixed on the lid 200. A support block 320 curved downward is provided at the center of the front side of the mounting plate 310, and a communication groove 322 is formed on the front surface of the support block 320 from the upper part to the lower part. Support grooves 324 are formed on both sides of the communication groove 322 of the support block 320, and the support grooves 324 are provided to reduce the thickness of the support block 320 and save material. A square fixing groove 326 is formed on the rear surface of the support block 320. Two pad fixing columns 328 projecting downward are provided below the support block 320.

The elastic plate 400 has a rectangular holding portion 410, and two circular holding holes 411 and one rectangular holding hole 411 are opened on the holding portion 410. The holding portion 410 is installed on the mounting plate 310 of the frame 300, and the three holding holes 411 are fitted on the fixed columns 311 of the mounting plate 310, respectively. The pressing part 430 protrudes from above the holding part 410, the pressing part 430 has a pressing arm 432 protruding downward from the center of the front side of the holding part 410, and the pressing arm 432 is installed in the communication groove 322 of the frame 300. . A pressing end 434 is curved at the end of the pressing arm 432. The holding portions 410 are formed with curved holding portions 421 at both ends of the rear side thereof. The holding portions 421 are installed at one edge portion of the mounting plate 310 of the frame 300, and the ends of the holding portions 421 are bent and square. An elastic arm support portion 423 is formed, and the elastic arm 422 is curved from the elastic arm support portion 423, the end of the elastic arm 422 is curved and has a bowl shape, and the end of the elastic arm 422 is the end of the paper feed roller 100. Contact the surface.

The sheet protection pad 500 is formed by bending a thin plastic plate or metal plate, and includes a plate-like stopper portion 510 and a sheet protection portion 520 curved from the stopper portion 510. The stopper portion 510 is fixed in the fixing groove 326 of the frame 300. The bottom surface of the paper protection unit 520 has a predetermined distance from the paper feed roller 100 and is positioned in front of the elastic arm 422.

The separation pad 600 is installed in front of the paper protection pad 500, and the friction coefficient between the paper and the paper is usually larger than the friction coefficient between the paper, but the friction coefficient between the paper feed roller 100 and the paper. Smaller than. The separation pad 600 has a plate-like separation part 630, and the tail part of the separation part 630 is supported on the outer surface of the paper feed roller 100. Two through holes 632 are formed on the separation part 630, the through holes 632 are fitted on the pad fixing columns 328 of the frame 300, and the separation pad 600 is fixed on the support block 320 of the frame 300. A pad pressing part 636 is cut out on the separation part 630, the pressing end 434 of the elastic plate 400 is supported on the pad pressing part 636, and the pad pressing part 636 is supported on the outer surface of the paper feed roller 100.

As shown in FIGS. 7 and 9, the pressing plate 710 has a rectangular upper plate 711, and the upper plate 711 presses the separation portion 630 of the separation pad 600. A shaft base 715 protrudes from both ends of the upper plate 711, and a shaft hole 716 is formed on the shaft base 715.

As shown in FIGS. 4, 7, 9, and 10, the torsion spring 740 is installed sideways and has two helical 740 torsion spring bodies 741, and a U-shaped pressing arm 742 is between the torsion spring bodies 741. Are connected, and the pressing arm 742 presses the pressing surface 210 of the lid 200. Spring holes 745 are formed in the center of both torsion spring bodies 741, and both ends of the spring holes 745 are respectively fitted to the convex columns 222 of the support block 220 of the lid body 200, whereby the torsion springs 740 are installed on the lid body 200. Is done. A swing arm 743 extends from the outer ends of the two torsion spring bodies 741, and the end of the swing arm 743 has a pivot 744 that is curved. The pivot 744 is installed in the shaft hole 716 of the pressing plate 710. Is done.

When the above-described torsion spring 740 is assembled to the sheet separating mechanism 10 of the automatic paper feeder, the pressing arm 742 and the swinging arm 743 are deformed by applying force to the two torsion spring bodies 741 so that F ′, F in FIG. The swinging arm 743 presses the pressing plate 710 with the pivot 744 pivotally installed in the shaft hole 716 of the pressing plate 710, and the separation pad 600 is tightly bonded to the paper feed roller 100. The pressing plate 710 can rotate in response to the torsion spring 740, and the upper plate 711 of the pressing plate 710 is closely bonded to the separation pad 600, and the separation pad 600 is firmly bonded to the paper feed roller 100. Combine.

The paper separation process of the paper separation mechanism 10 of the automatic paper feeder of the present invention will be described in detail below.

As shown in FIGS. 4, 7, and 12, when a plurality of sheets are installed in a sheet stacker (not shown), the front ends of the plurality of sheets press the ends of the elastic arms 422 by their own gravity, Enter between 100 and the end of the elastic arm 422. The elastic arm 422 is deformed by the paper and applies pressure to the paper. This pressure is transmitted from the paper to the paper feed roller 100, and a frictional force is generated in the paper feed roller 100 to move the paper during rotation. In the process of moving a plurality of sheets, some of the sheets are blocked by the stopper portion 510 of the sheet protection pad 500 and stop moving, and only a small amount of sheets continue to move along the sheet feeding roller 100 to move the primary sheet. The blocking operation is complete. Thereafter, the paper protection unit 520 of the paper protection pad 500 prevents the paper from being curled by pressing the paper.

When the paper continuously moves to the separation pad 600, the separation pad 600 performs a paper separation operation. The pad pressing portion 636 of the separation pad 600 is elastically deformed and supported by the outer surface of the paper feed roller 100, and the paper is primarily separated here. Thereafter, a small amount of paper is secondarily separated between the separation unit 630 and the paper feed roller 100 by introduction of the paper feed roller 100, and the pressure plate is pressed by the action of the swing arm 743 and the pressure arm 742 of the torsion spring 740. The close contact between the upper plate 711 and the separation unit 630, the separation unit 630 and the plurality of sheets, and the plurality of sheets and the sheet feeding roller 100 is maintained. A normal frictional force relationship is maintained between the separation pad 600 and the plurality of sheets, and the sheet feed roller 100 feeds only one sheet into the apparatus, and the sheet separation operation of the sheet separation mechanism 10 is completed.

As described above, in the separation mechanism 10 of the automatic paper feeder of the present invention, the torsion force generated when the torsion spring 740 is twisted and the swing arm 743 at both outer ends of the torsion spring 740 act on the pressing plate 710. Then, the pressing plate 710 presses the separation pad 600 by rotating the pressing plate 710 corresponding to the torsion spring 740. With this structure, the separation pad 600 and the outer surface of the paper feed roller 100 before the paper separation are tightly bonded, the separation pad 600 and the paper are tightly bonded during the paper separation process, and the paper and the paper feed roller 100 are outside. Tight pasting with the front surface and the tight pasting state between the separation pad 600 and the outer surface of the paper feed roller 100 after completion of paper separation are maintained, and the paper separation accuracy of the paper feed roller 100 is improved.

Further, since the pressing plate 710 is pivotally connected to the pivot 744 at the end of the swing arm 743, the pressing plate 710 swings itself based on the change in the relative positional relationship with the paper feed roller 100, and the separation pad. Is tightly bonded to the sheet feed roller 100, thereby maintaining a stable positional relationship with the sheet feed roller 100, and maintaining a normal frictional force relationship between the sheet feed roller 100, the plurality of sheets, and the separation pad 600. In addition, the sheet separation accuracy of the sheet separation mechanism 10 of the automatic sheet feeder is guaranteed.

Since the torsion spring 740 is installed sideways, the space occupied in the vertical direction is small, and the volume of the sheet separating mechanism can be effectively reduced.

As described above, the paper separating mechanism 10 of the automatic paper feeder of the present invention can achieve the effect by the above-described structure. The above description shows a preferred embodiment of the present invention and does not limit the scope of the utility model registration request. All modifications or changes made by those skilled in the art without departing from the spirit of the present invention are included in the claims for utility model registration.

It is a perspective view which shows the paper separation mechanism by a prior art. It is a side view which shows the paper separation mechanism by the prior art shown in FIG. FIG. 6 is a side view showing one state of a paper separation process of the paper separation mechanism according to the prior art shown in FIG. 1. It is a perspective view which shows the state which removed the cover body of the paper separation mechanism of the automatic paper feeder by this invention. It is a perspective view which shows the cover body of the paper separation mechanism of the automatic paper feeder by this invention. It is an enlarged view which shows the I section of FIG. FIG. 5 is an exploded perspective view showing a paper separation mechanism of the automatic paper feeder shown in FIG. 4. FIG. 5 is a perspective view showing an elastic plate and a frame of a paper separation mechanism of the automatic paper feeder shown in FIG. 4. FIG. 5 is a perspective view showing a torsion spring and a pressing plate of a paper separation mechanism of the automatic paper feeder shown in FIG. 4. FIG. 5 is a perspective view illustrating a natural state of a torsion spring of a sheet separation mechanism of the automatic sheet feeder illustrated in FIG. 4. FIG. 5 is a perspective view illustrating a state in which a torsion spring of a sheet separation mechanism of the automatic sheet feeder illustrated in FIG. 4 is twisted and deformed. FIG. 5 is a side view showing a paper separation mechanism of the automatic paper feeder shown in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Paper separation mechanism of automatic paper feeder 100 Paper feed roller 200 Lid 210 Press surface 220 Support block 222 Convex pillar 300 Frame 310 Mounting plate 311 Fixed pillar 320 Support block 322 Communication groove 324 Support groove 326 Fixed groove 328 Pad fixed pillar 340 Fixing part 350 Auxiliary part 400 Elastic plate 410 Holding part 411 Holding hole 421 Holding part 422 Elastic arm 423 Elastic arm support part 430 Pressing part 432 Pressing arm 434 Pressing end 500 Paper protection pad 510 Stopper part 520 Paper protection part 600 Separation pad 630 Separation Portion 632 Through-hole 636 Pad pressing portion 710 Pressing plate 711 Upper plate 715 Shaft base 716 Shaft hole 740 Torsion spring 741 Torsion spring main body 742 Pressing arm 743 Oscillating arm 744 Pivoting shaft 745 Spring hole

Claims (6)

  At least one torsion spring having a frame assembly, a paper feed roller, a swing arm, a pressing arm for pressing the frame assembly, and a torsion spring body installed on the frame assembly, and pivotally mounted on the swing arm A sheet separating mechanism of an automatic sheet feeder, comprising: a pressing plate; and a separation pad disposed between the sheet feeding roller and the pressing plate.   The torsion spring has two torsion spring bodies, the swing arms extend from above the two torsion spring bodies, and the pressing plate is pivoted on the swing arm. 2. The sheet separating mechanism of an automatic sheet feeding apparatus according to claim 1, wherein said two torsion spring bodies are integrally connected by said pressing arm.   From the end of the swing arm, the pivot is curved and extended, two shaft holes are formed on the pressing plate, the pivots are inserted into the two shaft holes of the pressing plate, respectively, and the swing is performed. The sheet separating mechanism of the automatic sheet feeder according to claim 2, wherein the moving arm is pivoted.   The frame assembly includes a frame, the frame has a mounting plate, a support block is formed by extending on one side edge of the mounting plate, and two pad fixing columns are provided on the support block. 2. The sheet separating mechanism of an automatic paper feeder according to claim 1, wherein two through holes are formed on the separation pad, and the two through holes are fitted on the pad fixing column.   An elastic plate is installed on the frame, and the elastic plate has two elastic arms and one pressing portion. The ends of the both elastic arms are in contact with the surface of the paper feed roller and move to the separation pad. 5. The sheet separating mechanism of an automatic paper feeder according to claim 4, wherein a possible pad pressing portion is cut out and the pressing portion presses the pad pressing portion.   6. The automatic paper feeding device according to claim 5, wherein a fixing groove is formed on the support block, a paper protection pad is fixed in the fixing groove, and the paper protection pad has a paper protection part. Paper separation mechanism.

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