JPH0510347U - Paper transport device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a paper carrying device capable of stably carrying paper by preventing abrasion of the paper carrying roller. [Structure] Paper is sandwiched between a rotating paper transport roller 8 and a paper pressing member 14 that contacts the outer peripheral surface of the paper transport roller 8, and the paper transport roller 8 is harder than the paper transport roller 8. The auxiliary member 13 made of a material is placed on the upstream side in the paper transport direction with respect to the contact point between the paper transport roller 8 and the paper pressing member 14.
A part of the auxiliary member 13 that comes into contact with the paper transport roller 8 in the paper transport device that presses and contacts the outer peripheral surface of the roller
A sheet 24 is interposed between the sheet conveying roller 8 and the outer peripheral surface of the sheet conveying roller 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper transport device provided in a transport path for transporting a document in a facsimile machine, for example.

[0002]

[Prior Art]

 The facsimile apparatus is provided with a document feeder for sequentially reading the documents to be transmitted, but conventionally, there is a document feeder shown in FIGS. 6 to 9.

FIG. 6 shows the entire document transport unit. In the figure, 1 is a main body of a facsimile machine, 2 is a document tray provided in the main body 1, and 3 is a document guide plate provided downstream of the document tray 2 in the paper transport direction. A document width guide 4 is provided on the document tray 2.

Roller holes 5, 6, and 7 are formed in the central portion of the document guide plate 3 in the width direction at intervals in the paper transport direction. As shown in FIG. 7, from the roller hole 5, the upper part of the paper transport roller 8 which is arranged under the document guide plate 3 in a direction perpendicular to the paper transport direction is projected upward. ing. The shaft 9 of the paper transport roller 8 is rotatably supported by a member (not shown) and rotated by a rotating device (not shown). The upper portions of the rollers 10 and 11 provided on the lower side of the document guide plate 3 also project into the other roller holes 6 and 7. A document reading window 23 is formed in a portion of the document guide plate 3 between the roller holes 6 and the roller holes 7, and a light source for reading a document (not shown) is provided below the document guide plate 3. And an image sensor.

Further, a unit for transporting a document is provided above the paper transport roller 8. This unit will be described with reference to FIGS. 7 to 9. In the figure, reference numeral 12 is a base made of synthetic resin, and a pair of auxiliary members 13, 13 are integrally formed on both sides of the base 12. The pair of auxiliary members 13, 13 are formed from the side surface of the base 12. It is an elongated member formed along the paper transport direction toward the diagonally lower side on the downstream side thereof, and has elasticity along the vertical direction centering on the connecting portion with the base 12. The lower ends of the auxiliary members 13 and 13 are bent in a V shape and have elasticity in the vertical direction.

On the upper surface of the base 12, one end of a paper pressing member 14 made of soft rubber is provided so as to overlap. One end of the paper pressing member 14 is formed by inserting and engaging the projection 15 formed on the upper surface of the base 12 into the hole 16 formed in the paper pressing member 14 and the hole 17a formed in the shaft mounting member 17. It is attached to the base 12.

Since the paper pressing member 14 has a length larger than that of the auxiliary members 13 and 13 of the base 12, the paper pressing member 14 extends from the base 12 toward the front side from the lower ends of the auxiliary members 13 and 13. A shaft mounting member 17 made of synthetic resin is arranged on the upper surface of the base 12. The shaft mounting member 17 is mounted on the base 12 by inserting and engaging a protrusion 18 formed on the upper surface of the base 12 with a hole 19 formed in the shaft mounting member 17. The shaft mounting member 17 has a shaft mounting portion having an elastic semicircular shape.

The unit configured as described above is arranged above the paper transport roller 8. A stay 20 is provided in the apparatus main body 1 at a right angle to the paper transport direction, and a shaft mounting portion of a shaft mounting member 17 of the unit is rotatably fitted to the stay 20. As a result, the unit is supported swingably in the vertical direction.

A back frame 21 is provided in the apparatus main body 1, and a holding spring 22 is attached to the frame 21 in a downward direction. The pressing spring 22 presses the paper pressing member 14 of the unit from above. In this state, the paper pressing member 14 is pressed by the pressing spring 22 and comes into contact with the outer peripheral surface of the paper transport roller 8 from above. The base 12 is pressed by the pressing spring 22 via the paper pressing member 14 and swings downward around the stay 20, and the lower end bent portions 13a and 13a of the pair of auxiliary members 13 and 13 are connected to the paper conveying roller. The outer peripheral surface of 8 is contacted from above. The locations where the lower end bent portions 13a, 13a of the pair of auxiliary members 13, 13 contact the outer peripheral surface of the paper transport roller 8 are the locations where the paper pressing member 14 contacts the outer peripheral surface of the paper transport roller 8. On the other hand, it is located on the upstream side in the paper transport direction.

Further, the coefficient of friction between the document P and the paper transport roller 8 is μ 1, the coefficient of friction between the document P and the paper pressing member 14 is μ 2, and the coefficient of friction between the document P and the document P is Where .mu.3 is set, the respective friction coefficients of the paper transport roller 6 and the paper pressing member 14 are set so that the relationship of .mu.1> .mu.2> .mu.3 is established. Then, the paper feeding roller 8 and the above-mentioned unit constitute a document feeding device. The operation of this document feeder will be described.

When transmitting with a facsimile apparatus, a plurality of originals P are stacked and placed on the original tray 1 and the original guide plate 3, and the front end of the original group is placed on the paper transport roller 8 on the outer peripheral surface. When the paper transport roller 8 is rotated in the direction of the arrow in the figure, the lowermost original P is transported toward the front side in the transport direction by the frictional force with the paper transport roller 8, and a pair of auxiliary members of the base 12 are conveyed. The sheet is conveyed under the sheets 13 and 13 toward the contact portion between the sheet pressing member 14 and the sheet conveying roller 8. Here, the pair of auxiliary members 13 and 13 of the base 12 press the document P from above and bring it into contact with the outer peripheral surface of the paper transport roller 8, so that the document P is reliably rotated by the rotation of the paper transport roller 8. It is guided to the contact portion between the paper pressing member 14 and the paper transport roller 8.

When the lowermost original P placed on the original tray 1 is conveyed, the original P stacked on top of the original P tries to move forward. The forward movement is blocked by hitting the members 13, 13. When the lowermost original P is conveyed and its rear end passes through the contact portion between the pair of auxiliary members 13 and 13 and the paper conveying roller 8, the original P superposed on the upper side is the lowermost one. Then, the original P is conveyed in the same manner as in the above case.

In this way, the respective documents P stacked on the document tray 1 are conveyed in a stepwise manner from the lowermost one. Each conveyed document P passes through a document reading window 23 provided in the paper guide plate 3, and the document P is read.

By the way, in the conventional document conveying device, the paper conveying roller 8 is formed of sponge. This is for the following reason. Paper dust is generated from the original conveyed by the original conveying device, and the paper dust adheres to the outer peripheral surface of the paper conveying roller 8. If paper dust is present on the outer peripheral surface of the paper transport roller 8, the coefficient of friction of the paper transport roller 8 decreases, and the speed at which the paper transport roller 8 transports the document P varies. This may disturb the reading of the document P.

However, since the paper conveying roller 8 made of sponge has air bubbles on the outer peripheral surface and inside thereof, when paper powder adheres to the outer peripheral surface of the roller, the paper powder is transferred to the outer peripheral surface of the roller. Penetrate inside bubbles existing on the surface. Therefore, the paper dust is not present on the outer peripheral surface of the paper transport roller 8, and the original friction coefficient of the paper transport roller 8 does not change and the transport speed of the document P can be stably maintained. This is because there are advantages.

[0016]

[Problems to be solved by the device]

 However, although the paper transport roller 8 made of sponge does not cause any adverse effect on paper powder as described above, it has low abrasion resistance and is easily worn. For this reason, as shown in FIGS. 8 and 9, the outer peripheral surface of the paper conveying roller 8 made of sponge is quickly abraded at the portions where the lower end bent portions 13a, 13a of the pair of auxiliary members 13, 13 of the base 12 come into contact with each other. To do. As a result, the outer peripheral surface portion of the paper transport roller 8 with which the lower end bent portions 13a, 13a of the pair of auxiliary members 13, 13 come into contact with each other becomes like grooves. A pair of auxiliary members 13, 13 are inserted into the groove on the outer peripheral surface of the transport roller 8. As a result, the document P may be less likely to bite between the pair of auxiliary members 13, 13 and the paper transport roller 8, which may make it difficult to transport the document P. The present invention has been made under the above circumstances. It is an object of the present invention to provide a paper transporting device capable of stably transporting paper while preventing abrasion in the paper transporting roller.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the paper carrying device of the present invention sandwiches a paper between a rotating paper carrying roller and a paper pressing member which contacts the outer peripheral surface of the paper carrying roller. In addition to carrying the paper, the auxiliary member formed of a material harder than the paper carrying roller is provided on the upstream side in the paper carrying direction with respect to the contact point between the paper carrying roller and the paper pressing member. In a paper conveying device that presses the outer peripheral surface of a roller, a sheet is provided between the outer peripheral surface of the paper conveying roller and a portion of the auxiliary member that comes into contact with the paper conveying roller. It is characterized by

[0018]

[Action]

 In the conventional paper transporting device, since the pair of auxiliary members of the base of the unit are elongated, the lower end bent portion contacts the outer peripheral surface of the paper transporting roller in a narrow area. That is, the lower-end bending portions of the pair of auxiliary members come into contact with the paper transport roller at a constant pressure, but this contact pressure acts concentratedly on the narrow area portion of the paper transport roller. Therefore, in the paper transport roller made of sponge, the portion of the base that comes into contact with the pair of auxiliary members is rapidly worn.

On the other hand, the paper conveying device of the present invention is an auxiliary device that guides a plurality of stacked papers one by one from the bottommost sheet to the contact portion between the paper conveying roller and the paper pressing member. Since the sheet is interposed between the member and the paper transport roller, the contact pressure of the auxiliary member can be dispersed and acted on the wide area portion of the paper transport roller via the sheet. it can. Therefore, even with a paper transport roller made of a soft material such as sponge, it is possible to suppress the progress of wear of the portion in contact with the auxiliary member as much as possible, and it is possible to maintain stable paper transport for a long period of time.

Further, since the auxiliary member presses the paper conveyance roller via the sheet wider than this, the deformation of the outer peripheral surface of the paper conveyance roller is small and the paper insertion angle becomes shallow, so that the paper conveyance roller is inclined. It becomes easier to bite into the paper and the paper can be reliably and stably conveyed.

[0021]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention.

This embodiment is applied to the document feeder provided in the transmission section of the facsimile apparatus shown in FIG. Therefore, in FIGS. 1 to 5, the same parts as those in FIGS. 7 to 10 are denoted by the same reference numerals. The characteristic configuration of this embodiment will be described.

In the figure, reference numerals 24 and 24 denote sheets respectively arranged between the pair of auxiliary members 13 and 13 of the base 12 of the unit and the outer peripheral surface of the paper transport roller 8, and these sheets are disposed. The sheets 24 and 24 are formed continuously with the attachment sheet 25. The sheets 24 and 24 and the attachment sheet 25 are integrally formed of a synthetic resin film having an insulating property. The attachment sheet 25 is attached to the lower surface of the base 12 with an adhesive, and the pair of sheets 24, 24 are located below the pair of auxiliary members 13, 13 on both sides of the attachment sheet 25. It extends from the side part of the paper to the downstream side along the paper transport direction.

The pair of sheets 24, 24 has a width larger than the width of the pair of auxiliary members 13, 13, and the tips of the pair of sheets 24, 24 have the width of the pair of auxiliary members 13, 13. The lower end is located directly below the bent portions 13a, 13a. Therefore, the tips of the pair of sheets 24 and 24 are pushed by the lower end bent portions 13a and 13a of the pair of auxiliary members 13 and 13 and come into contact with the outer peripheral surface of the paper transport roller 8.

The pair of sheets 24, 24 are required by the force applied from the lower end bent portions 13 a, 13 a in order to disperse the force applied by the lower end bent portions 13 a, 13 a of the pair of auxiliary members 13, 13. A synthetic resin film having rigidity that does not bend as described above is used. If the coefficient of friction between the original P and the sheet 24 is .mu.4, .mu.4> the coefficient of friction between the original P and the paper pressing member 14 .mu.2> the coefficient of friction between the original P and the original P.mu.3. Each friction coefficient is set so that the relationship is established.

According to this configuration, the lower end bent portions 13 a, 13 a of the pair of auxiliary members 13, 13 of the base 12 are outside the paper transport roller 8 via the tips of the wide pair of sheets 24, 24. Contact the peripheral surface. Therefore, the contact pressure of the pair of auxiliary members 13, 13 of the base 12 can be dispersed and acted on the wide area portion of the paper transport roller 8 via the pair of sheets 24, 24.

When the document is transmitted by the facsimile apparatus, the original P is rotated by the paper conveying roller 8 and the pair of sheets 24 pressed by the lower end bent portions 13a, 13a of the pair of auxiliary members 13, 13. , 24 and the leading end of the sheet 24. That is, the document P is pushed by the tip ends of the pair of sheets 24, 24 pushed by the lower end bent portions 13a, 13a of the pair of auxiliary members 13, 13 and comes into contact with the outer peripheral surface of the paper transport roller 8. ..

Therefore, even in the paper transport roller 8 made of sponge, the progress of wear of the portions in contact with the pair of auxiliary members 13, 13 can be suppressed as much as possible, and the stable transport of the document P can be maintained for a long period of time. ..

Further, since the pair of auxiliary members 13, 13 of the base 12 press the paper transport roller 8 via the sheets 24, 24 wider than this, the outer peripheral surface of the paper transport roller 8 is pressed. Since the deformation is small and the facing angle of the original P is shallow, the original P is likely to bite between the paper transport roller 8 and the pair of auxiliary members 13, 13, and the original P is reliably and stably transported. It should be noted that the present invention is not limited to the above-described embodiment, but can be carried out in various modified forms. For example, the configuration of the auxiliary member is not limited to the embodiment. The present invention can be applied not only to document transportation but also to an image forming unit such as a receiving unit of a facsimile machine or a device for transporting the subject matter in a copying machine.

[0030]

As described above, according to the paper carrying device of the present invention, an auxiliary member for guiding a plurality of papers to the contact portion between the paper carrying roller and the paper pressing member, and a paper carrying roller. Since the sheet is interposed between the roller and the roller, the contact pressure of the auxiliary member can be dispersed and acted on the wide area portion of the paper transport roller via the sheet. Therefore, even in a paper transport roller made of a soft material such as sponge, it is possible to suppress the progress of wear of the portion in contact with the auxiliary member as much as possible and maintain stable transport of the paper for a long time.

Further, since the auxiliary member presses the paper carrying roller via the sheet wider than this, the deformation of the outer peripheral surface of the paper carrying roller is small and the paper carrying roller and the auxiliary member are not deformed. It is easy to bite the paper into the space, and it is possible to reliably and stably convey the paper.

[Brief description of drawings]

FIG. 1 is a front view of a paper feeding device provided in a document feeding path in a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a contact portion between an auxiliary member and a sheet and a paper transport roller in the embodiment.

FIG. 3 is a plan view showing a paper pressing member, an auxiliary member, and a sheet in the embodiment.

FIG. 4 is a side view showing a paper pressing member, an auxiliary member, and a sheet in the embodiment.

FIG. 5 is a perspective view showing a paper pressing member, an auxiliary member and a sheet in the same embodiment as seen from below.

FIG. 6 is a perspective view showing a document transport path in the facsimile apparatus.

FIG. 7 is a front view showing a paper transporting device provided in a document transporting path of a conventional facsimile device.

FIG. 8 is a plan view showing a paper pressing member and an auxiliary member in the conventional example.

FIG. 9 is a side view showing a paper pressing member and an auxiliary member in the conventional example.

FIG. 10 is a perspective view showing a paper pressing member and an auxiliary member in the conventional example as viewed from below.

[Explanation of symbols]

8 ... Paper transport roller, 12 ... Base, 13 ... Auxiliary member, 1
4 ... Pressing member, 24 ... Sheet.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H04N 1/00 108 L 4226-5C

Claims (1)

[Claims for utility model registration] 1. A paper is sandwiched between a rotating paper transporting roller and a paper pressing member in contact with an outer peripheral surface of the paper transporting roller, and the paper is transported. An auxiliary member formed of a material harder than the paper transport roller is provided on the outer peripheral surface of the paper transport roller on the upstream side in the paper transport direction with respect to the contact point between the paper transport roller and the paper pressing member. A paper transporting device in which a sheet is brought into pressure contact with a sheet interposed between an outer peripheral surface of the paper transporting roller and a portion of the auxiliary member that comes into contact with the paper transporting roller.