JP3822414B2 - Paper feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding device that is applied to an image forming unit or a document reading unit such as a facsimile machine, a copier, or a printer, and feeds a sheet of recording paper or a document in a predetermined direction.
[0002]
[Prior art]
In a facsimile machine or the like, a paper feeding device that feeds a document to a document information reading unit includes a separation roller comprising a conveyance roller and a contact member in contact with the conveyance roller in order to separate and feed a plurality of documents one by one. Some have a paper feeder. This separation sheet feeding unit is normally set so that the relationship between the friction coefficient μ1 of the conveyance roller, the friction coefficient μ2 of the contact member, and the friction coefficient μ3 between the documents satisfies μ1>μ2> μ3, and the document is conveyed. In the case of multi-feed between the roller and the contact member, only the document on the transport roller side is slid with respect to other documents by receiving the transport force of the transport roller.
[0003]
However, in the paper feeding device provided with the separation paper feeding unit, when a paper on which paper is pasted or a paper that does not want to be stressed during paper feeding is fed, those originals In order to prevent the separation feeding force in the separation feeding unit from being applied, a gap is formed between the conveying roller and the contact member in the separation feeding unit, and the document is fed manually one by one. Some configurations are possible.
[0004]
In general, the manual feed mode is set and canceled by manual operation as described in, for example, Japanese Patent Laid-Open No. 5-4761.
[0005]
[Problems to be solved by the invention]
As described above, in the conventional sheet feeding device that includes the separation sheet feeding unit and is capable of setting the manual sheet feeding mode, the manual sheet feeding mode setting is manually canceled. If the operator leaves the device equipped with the paper feeder without canceling the manual paper feed mode setting, the separate paper feed function will be used to feed multiple documents one by one during the next operation. Even if an attempt is made to do so, if the operator at that time notices the setting state and does not change the setting, the manual feed mode remains set, resulting in a problem that the document is fed at a time.
[0006]
If manual feed mode is set, if any trouble occurs in the device or paper feeder, even if the trouble is cleared, manual feed mode will not be canceled automatically. In the subsequent sheet feeding, troubles due to the manual sheet feeding mode continue to occur.
[0007]
An object of the present invention is to solve the above-described conventional problems, and in a paper feeding device having a configuration capable of manually feeding paper, the manual feed state is reliably released, and there is a problem caused by the operator forgetting to release the manual feed state. It is to prevent the occurrence.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention according to claim 1 is a sheet feeding device configured to be able to manually feed a sheet, and a manual feed setting member that is moved to bring the sheet conveyance path into a manually feedable state. A lock member that locks the manual setting member in the manual feed state to maintain the manual feed state, and an initialization setting operation of the paper feeding device constituent member after paper conveyance, and for the manual setting by the lock member And a release member that releases an operation lock on the member , wherein the initialization setting operation of the paper feed device constituent member is a rotational drive for a transport roller that transports the paper in the paper transport path, and The release member is rotated by the rotation of the conveyance roller to the conveyance roller to release the operation lock on the manual setting member by the lock member. Actuating unit is characterized in that the provided for, row by this configuration, set the paper conveyance path in the bypass state, and manual feed setting member to maintain the state, for each initialization setting operation of the paper feed Since the sheet is returned to the standby position by the rotation of the transport roller , the manual feed state can be automatically released when the manual paper feed is completed.
[0009]
According to a second aspect of the present invention, in the paper feeding device according to the first aspect, even if the release member receives a movement operation of the paper guide plate constituting the paper conveyance path, the operation lock with respect to the manual setting member by the lock member. characterized by Rukoto is released, this configuration manual feed setting member, moving the paper guide plate in order to solve the trouble caused in the sheet conveyance path in the manual feed, the standby position in association therewith Since it is returned and the manual feed state is released, it is possible to prevent the same trouble from recurring due to manual paper feed .
[0011]
According to a third aspect of the present invention, in the paper feeding device according to the first aspect, the separation paper feeding comprising a conveyance roller for separating and feeding sheets one by one to the sheet conveyance path and a contact member in contact with the conveyance roller. This is characterized in that, in the manual feed state, the part that is installed so that it can be moved in and out of the paper transport path is separated from the other by the manual feed setting member. Thus, in the manual feeding state, a member that applies a load to the paper of the separation paper feeding unit can be retracted from the paper conveyance path, and the manual paper feeding can be performed smoothly.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a side sectional view of a document conveying device in a document reading device for explaining an embodiment of the present invention, FIG. 2 is a side sectional view showing a separation feeding unit in the document conveying device in FIG. 1, and FIG. 1 is a plan view of the main part of the original document conveying apparatus; 1 is a main body of the apparatus, 2 and 3 are opposed to each other and are provided with a paper guide plate for guiding the conveyance of the original document, and 4 is one of the paper guide plates Document setting port set in the opening, 5 is a document discharge port set in the other opening of the paper guide plates 2 and 3, 6 is a pickup roller, 7 is a pressing plate for pressing the document set in the pickup roller 6, Reference numeral 8 denotes a separation sheet feeding unit including a conveyance roller 9 and a contact member 10 in contact with the conveyance roller 9 shown in FIG. 2, 11 and 12 are installed between the document conveyance roller pair, and 13 is installed between the document conveyance roller pair 11 and 12. Document reading sensor.
[0016]
FIG. 4 is an exploded view of the separation sheet feeding unit. In the separation sheet feeding unit 8, the contact member 10 is made of a rubber plate, and the contact member 10 is supported by the upper sheet guide plate 2 as shown in FIG. It is provided below the holding member 14 that is pivotally supported by the portion 2 a and is in contact with the transport roller 9. Further, as shown in FIG. 3, a coil spring 15 extends on the upper left portion of the holding member 14, and the coil spring 15 biases the contact member 10 in a direction in which the contact member 10 comes into contact with the conveying roller 9 through the holding member 14. ing.
[0017]
Reference numeral 16 denotes an auxiliary pressure roller member. The upper portion of the auxiliary pressure roller member is rotatably supported by the holding member 14 by a shaft portion 16a, and a roller portion 16b that contacts the conveyance roller 9 is rotatably provided at a lower end portion. ing. The roller portion 16 b is urged so that one end is locked to a part of the auxiliary pressure roller member 16 and the other end is pressed against the conveying roller 9 by a biasing spring 17 locked to the holding member 14. ing.
[0018]
In the pair of document conveying rollers 11 and 12, the lower portions are driving rollers 11a and 12a, and the upper portions are driven by the driving rollers 11a and 12a, and are urged by the urging means so as to contact the driving rollers 11a and 12a. As shown in FIG. 3, the pair of document conveying rollers 11 on the upstream side in the document conveying direction (direction of arrow A) has both ends of the rotating shaft 18 of the pressure roller 11b. The bearings 19 are respectively supported, and are further pressed and biased toward the drive roller 11 a by biasing plate springs 20 of biasing means at both ends of the rotating shaft 18.
[0019]
1 and 3, reference numeral 21 denotes a manual feed button which is a manual feed setting member slidably installed on the upper paper guide plate 2, and an operation button portion 21 a of the manual feed button 21 is provided from the apparatus main body 1 to the outside. It protrudes. As shown in FIG. 3, the manual feed button 21 is urged toward the outside of the apparatus main body 1 by a return spring 22. The manual feed button 21 is provided with a protruding portion 23 that protrudes laterally inside the apparatus main body 1, and an arm portion 23 a provided on the protruding portion 23 urges the holding member 14 in the separation sheet feeding portion 8. The coil spring 15 can be pushed up.
[0020]
Further, as shown in FIG. 1, the manual feed button 21 is formed with an engagement recess 24 below the tip portion protruding from the protrusion 23, and the engagement recess 24 rotates to the paper guide plate 2. It can be engaged with one convex portion 25a of the first rotating arm 25 which is a lock member pivotally supported. The other convex portion 25b of the first rotary arm 25 can come into contact with one end portion 26a of the second rotary arm 26 that is a release member that is pivotally supported 26b in the vicinity of the first rotary arm 25. It has become. As shown in FIGS. 5 and 6, a through hole 27 through which the rotary shaft 18 of the pressure roller 11 b passes is formed on the other side of the second rotary arm 26, and an operating projection 28 is provided in the vicinity of the through hole 27. Is formed. The operating projection 28 is a plurality of small projections that are provided around the rotary drive member 29 that is an operating member provided on the rotary shaft 18 on one end side of the pressure roller 11b via a one-way rotary clutch (not shown). One of the protrusions 29a comes into contact.
[0021]
FIGS. 1 and 2 show a state in which the automatic paper feeding mode in which a plurality of originals stacked using the separation paper supply unit 8 are fed one by one in the configuration of the above embodiment is set. When a plurality of documents are inserted into the set port 4 and the paper feeding operation is started, the pickup roller 6 rises and rotates. Then, the upper side of the original is pressed against the pressing plate 7 and is fed so as to be pulled from the lower side of the original on the pickup roller 6 side.
[0022]
The document sent from the pickup roller 6 reaches the separation sheet feeding unit 8 and is sent downstream in the document conveyance direction by the rotation of the conveyance roller 9. In the separation sheet feeding unit 8, the friction coefficient μ 1 of the conveyance roller 9 and the contact When the relationship between the friction coefficient μ2 of the member 10 and the friction coefficient μ3 between the documents is set to satisfy μ1>μ2> μ3, and when the document is fed between the transport roller 9 and the contact member 10, In response to the conveyance force of the conveyance roller 9, only the document on the conveyance roller 9 side is fed so as to slide with respect to other documents.
[0023]
The originals separated and fed one by one from the separation paper supply unit 8 in this way are further conveyed at a predetermined speed by the original conveying roller pairs 11 and 12 downstream in the original conveying direction C, and read by the original reading sensor 13. The document information is read through the position, and is discharged to the outside of the apparatus main body 1.
[0024]
Next, a case where manual feeding is performed in the apparatus according to the present embodiment will be described.
[0025]
When manual feeding is performed, the operation button portion 21 a is pressed, and the manual button 21 is pushed into the apparatus main body 1 against the urging force of the return spring 22. Then, as shown in FIG. 7, the tip of the arm portion 23 a of the protruding portion 23 of the manual feed button 21 pushes up the side portion of the coil spring 15 and lifts it, and releases the bias of the coil spring 15 to the holding member 14. At this time, the auxiliary pressure roller member 16 is in a state where the roller portion 16b is pressed against the transport roller 9 by the biasing spring 17 shown in FIG. 2, but the holding member 14 whose biasing force of the coil spring 15 is released is In response to the pulling force of the urging spring 17, the support portion 2a is rotated in the clockwise direction. Therefore, the contact member 10 rotates in the same direction together with the holding member 14, and the gap D is formed away from the conveying roller 9, so that no load is applied to the manual feed document in the separation sheet feeding unit 8.
[0026]
In the process of pushing the manual feed button 21, as shown in FIG. 8, the tip portion of the manual feed button 21 rides on one convex portion 25a of the first rotary arm 25, and the engaging concave portion 24 of the manual feed button 21 is the first. The operation of the manual feed button 21 is brought into the locked state by engaging with one convex portion 25a of the rotary arm 25.
[0027]
In this way, the document conveyance path is set in a manually feedable state, and when one document is inserted from the document setting port 4, the document is placed on the conveyance roller 9 on the auxiliary pressure roller member 16 as shown in FIG. While being pressed by the roller portion 16b with a force weaker than the pressing force by the contact member 10, it is sent downstream in the document conveyance direction C, and further conveyed at a predetermined speed by the document conveyance roller pair 11, 12, and the document reading sensor 13 The document information is read through the reading position, and is discharged to the outside of the apparatus main body 1.
[0028]
Release of the manual paper feed setting is performed in response to an initialization setting operation of components after manual paper feed. In the present embodiment, the fact that the document transport roller pair 11 on the upstream side in the document transport direction rotates in reverse during the initialization operation is utilized.
[0029]
That is, as shown in FIG. 9, when the document transport roller pair 11 is rotated in the reverse direction (in the direction of arrow E), the rotation shaft 18 of the pressure roller 11b rotates in the same direction and is driven to rotate by the action of the one-way rotation clutch. Both members 29 also rotate in the same direction. As a result of this rotation, one of the small protrusions 29a of the rotation drive member 29 comes into contact with the operating protrusion 28 of the second rotation arm 26, and rotates the second rotation arm 26 counterclockwise. With the rotation of the second rotation arm 26, one end portion 26a of the second rotation arm 26 pushes the convex portion 25b of the first rotation arm 25 to rotate the first rotation arm 25 in the clockwise direction. As a result, the engagement between the one convex portion 25a of the first rotary arm 25 and the engaging concave portion 24 of the manual feed button 21 is released. The manual feed button 21 released from the engagement moves toward the outside of the apparatus main body 1 by the return spring 22, and the operation button portion 21a returns to the standby position.
[0030]
As described above, since the manual feeding state in the paper feeding unit is automatically canceled when the manual paper feeding is completed, it is possible to prevent the occurrence of a malfunction due to the operator forgetting to cancel the manual paper feeding mode. .
[0031]
In the present embodiment, for example, even when a trouble such as a jam occurs in the document conveyance path during the manual feeding and the paper guide plates 2 and 3 need to be opened, the manual feeding is automatically performed. The setting is canceled.
[0032]
That is, in FIG. 10, the upper sheet guide plate 2 is moved by rotating counterclockwise around the rotation fulcrum of the pressure roller 12b of the document conveying roller pair 12 on the document discharge port 5 side. When canceling a trouble in paper feeding such as removal, the pressure roller 11b of the document transport roller pair 11 rises and separates from the driving roller 11a. At this time, since the rotating shaft 18 receives the urging force of the urging plate spring 20 shown in FIG. 3, it is lowered to the lower side of the through hole 27 shown in FIG. This lowering causes the second rotating arm 26 to rotate counterclockwise. By this rotation, in the same manner as described above, the one end portion 26a of the second rotation arm 26 pushes the convex portion 25b of the first rotation arm 25 to rotate the first rotation arm 25 in the clockwise direction. As a result, the engagement between the one convex portion 25a of the first rotary arm 25 and the engaging concave portion 24 of the manual feed button 21 is released. The manual feed button 21 that has been disengaged is moved outward by the return spring 22, and the operation button portion 21 a returns to the standby position.
[0033]
As described above, when the paper guide plate 2 is moved in order to solve the trouble that has occurred in the document conveyance path during manual feeding, the manual feed button 21 is returned to the standby position in conjunction with the movement, and the manual feeding mode is automatically set. Therefore, it is possible to prevent the same trouble from recurring due to the sheet feeding while the manual sheet feeding mode is set.
[0034]
【The invention's effect】
As described above, according to the present invention, the conveyance roller in which the sheet conveyance path is set to a manual feedable state and the manual setting member for maintaining the state is performed for each initialization setting operation of the sheet feeding. When the manual feed is completed, the manual feed setting is automatically canceled when the manual feed is completed, so that the operator may forget to cancel the manual feed setting. Can be prevented.
[0035]
In addition, the manual setting member can be returned to the standby position in conjunction with the movement of the paper guide plate in order to eliminate the trouble that has occurred in the paper conveyance path during manual paper feeding. Since the manual paper feed setting can be automatically canceled, it is possible to prevent the same trouble from being repeated due to manual paper feed.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a document conveying device in a document reading device for explaining an embodiment of the present invention. FIG. 2 is a side sectional view showing a separation sheet feeding unit in the document conveying device of an embodiment of the present invention. 3 is a plan view of the main part of the document conveying apparatus according to the embodiment of the present invention. FIG. 4 is an exploded view of the separation sheet feeding unit according to the embodiment of the present invention. FIG. 6 is an exploded view of the second rotating arm portion in the embodiment of the present invention. FIG. 7 is a side sectional view showing the state of the separation sheet feeding portion during manual sheet feeding in the embodiment of the present invention. FIG. 8 is a side cross-sectional view showing an operation lock state of a manual feed button during manual paper feed in an embodiment of the present invention. FIG. 9 is a side cross-sectional view showing a state in which manual paper feed setting is released in the embodiment of the present invention. FIG. 10 shows an embodiment of the present invention. Kicking side sectional view showing a state of the setting cancellation of manual paper feeding when moving the paper guide plate EXPLANATION OF REFERENCE NUMERALS
2, 3 Paper guide plate 4 Document setting port 5 Document discharge port 6 Pickup roller 8 Separation feeding unit 9 Transport roller 10 Contact member 11, 12 Document transport roller pair 11a, 12a Drive roller 11b, 12b Pressure roller 21 Manual feed button 21a Operation button portion 24 Engaging recess 25 First rotating arm 26 Second rotating arm

Claims (3)

In a paper feeder configured to manually feed paper,
A manual setting member that is moved so that the paper conveyance path can be manually inserted, a lock member that locks the manual setting member in operation and maintains the manual feeding state in the manual insertion state, and a paper feeding device after paper conveyance A sheet feeding device including a release member that receives an initialization setting operation of a component member and releases an operation lock on the manual setting member by the lock member;
The initialization setting operation of the sheet feeding device component member is rotational driving with respect to a conveyance roller that conveys a sheet in a sheet conveyance path, and the release member is rotated by the rotation of the conveyance roller. A sheet feeding device comprising an operating portion for releasing an operation lock on the manual feed setting member by a lock member.   2. The paper feed according to claim 1, wherein the release member releases an operation lock on the manual setting member by the lock member even when the paper guide plate constituting the paper transport path is moved. apparatus. In the sheet conveyance path, a conveyance roller for separating and feeding sheets one by one and a separation sheet feeding unit including a contact member in contact with the conveyance roller are installed, and the conveyance roller and the contact member are in the manual feeding state. said those and out can installed to the sheet conveying path, claim 1 Symbol placement of the sheet feeding apparatus is characterized in that the arrangement away relative to the other by the manual feed setting member in.

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