JP2942861B2 - Paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder for feeding a document sheet onto a platen of a copying apparatus, for example.

[Prior Art] As a conventional paper feeding apparatus, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 60-204530.

According to the publication, a document feed start roller capable of taking two states, a contact state and a separated state with a document on a document tray, a document feed roller downstream of the document feed start roller, and a document feed roller The double feed prevention rollers at the lower part of the rollers are connected to each other by mechanical means, and a clutch means is provided between the roller group and its driving source, the clutch means constituting a disconnection state only at the starting position of the roller group. In a paper feeder that performs intermittent document feeding at a fixed timing, means for rotating a drive source for a predetermined time in response to power-on and checking whether the document feeding conditions are satisfied after the predetermined time. And a means for re-driving the drive source after the document feed condition is satisfied.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional paper feeding device, the device is returned to an initial state when the device is restarted after being temporarily stopped due to a jam or the like. The conventional problem that it does not return to the initial state and takes time to remove the jammed paper has not been solved.

[Object of the Invention] The present invention has been made in view of such problems in the related art, and when a jam occurs, it is possible to easily remove and reset the jammed paper, thereby improving the operability. The purpose is to provide a paper device.

Means for Solving the Problems To achieve the above object, the present invention provides a paper feed stacker for loading paper, a paper feed roller for feeding paper in contact with the uppermost surface of the paper on the paper feed stacker, and a paper feed roller. A sheet feeder comprising: a driving unit that moves a roller to a position that is separated from a position where the roller contacts the top surface of the sheet on the sheet feeder stack; and a recognition unit that recognizes a conveyance failure of the sheet fed by the feed unit. In the apparatus, a display means for displaying a paper transport failure and the drive means are controlled to move the feed roller to a position separated from a position in contact with the uppermost surface of the paper when the recognition means recognizes the transport failure. And control means for controlling the display means so as to display a conveyance failure after moving the feeding roller by a predetermined amount in a direction away from the top surface of the sheet. Things.

[Operation] When a sheet is placed on the sheet feeder stacker and the apparatus is started, the drive motor rotates forward and the feed roller comes into contact with the uppermost sheet of the sheet, and the sheet is fed and sheet feeding is started. .
A paper detection sensor is provided on the downstream side of the feeding unit, and when the paper detection sensor does not detect a sheet even after a predetermined time has elapsed from the start of the operation of feeding the sheet by the feeding roller, the sheet is conveyed. Upon recognizing that the sheet is defective, the drive motor rotates in the reverse direction to separate the feeding roller from the sheet, and then displays a conveyance defect. In this way, by displaying the transport failure after the feeding roller is separated from the paper when the transport failure occurs, the operator can easily remove the paper on the paper feed stacker and quickly process the transport failure paper. At the same time, no inconvenience occurs when the paper is reset.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Structure) In this embodiment, as shown in FIG. 1, a description will be given of a paper feeder that supplies a document sheet onto a platen 2 of a copying apparatus 1.

The paper feeder 10 includes a paper feed stacker 11 on which a document is placed, a feed unit 20 that separates the documents set in the feed stacker 11 one by one, and feeds the separated document onto the platen 2. Transport section 100 as transport means for transporting the sheet sent from the printer along the platen 2, and a paper discharge section 110 as a discharge means for discharging the original transported on the platen 2 by the transport section 100 after turning over the original. And a paper discharge stacker 12 for storing the document discharged from the paper discharge unit 110, a control device (not shown), and a drive device shown in FIG.

Note that the paper feed stacker 11 is provided with side edge guides that can be freely moved in equal directions in opposite directions so that the original is always held at the center in the width direction.

Paper feed guides 21 and 22 that form a paper feed path
Feeding means for feeding out the original set in the paper feed stacker 11, for example, a pickup roller 23;
An empty sensor 24 that detects whether or not a document is set on the document 11; a paper feed roller 25 that is a feed rotating body that rotates in the paper feeding direction; and follows the document fed by the paper feed roller 25. A separation roller 26, which is a separation member that rotates in a direction in which the document to be retreated, a size detection sensor 27 for detecting the size of the document in the width direction, and a registration sensor 28 for detecting that the document has reached the registration rotator And a registration rotating body such as registration rollers 29 and 29a.

The paper feed roller 25 is attached to a rotating shaft 40 shown in FIG. 2 via a one-way clutch. Further, the sheet feeding roller 25 and the separating roller 26 constitute a separating unit.

The pickup roller 23 has its rotation shaft 42 supported by a pair of arms 44 (support members) whose base ends are attached to the rotation shaft 40 via a spring clutch 43. And
The gears 58, 59, and 60 are transmitted.

The spring clutch 43 idles when a load equal to or more than a predetermined value is applied during normal rotation of the drive motor 30 described later.

The transport unit 100 includes a pair of rollers 101 and 102, a transport belt 103 stretched between the rollers 101 and 102, and a plurality of press rollers 104 that press the transport belt 103 against the platen 2 side. I have.

As shown in FIG. 2, a pulley 46 is attached to the rotating shaft 45 of the roller 101, and a pulley 48 is attached to the rotating shaft 47 of the roller 102.

The paper discharge unit 110 includes paper discharge guides 111 and 11 that form a paper discharge path.
2, a synthetic resin sheet 113 attached to the lower end of the paper ejection guide 112, and a transport belt attached to the paper ejection guide 112.
A pinch roller 114 pressed against 103, and a paper ejection sensor 115
, A paper discharge roller 116, and a leaf spring 117 pressed against the paper discharge roller 116.

Note that, as shown in FIG.
9 is provided with a pulley 50, and this pulley 50 is
8 and a round belt 51.

The control device includes, for example, a microcomputer, and controls the drive of a drive motor 30, which will be described later, based on signals from the sensors 24, 27, 28, and 115 and signals from the copying machine 1.

As shown in FIG. 2, the driving device includes a drive motor 30 that can rotate forward and reverse, a pulley 32 attached to a rotating shaft 31 of the drive motor 30, a timing belt 35 connecting the pulley 32 and the pulley 34, A gear 38 attached to the rotating shaft 33 via a spring clutch 37, and a gear 39 meshing with the gear 38
A gear 41 meshing with the gear 39, a gear 52 meshing with the gear 41, a gear 54 attached to the rotating shaft 53 of the separation roller 26 and meshing with the gear 52, and a rotating shaft 33 via a one-way clutch. Installed gear 36 and registration roller 29
Gear 56 which is attached to the rotating shaft 55 of the
And a gear 57 that meshes with the gears 46 and 56.

The spring clutch 37 idles when a load equal to or greater than a predetermined value is applied when the drive motor 30 rotates in the reverse direction.

When the drive motor 30 rotates forward, the pickup roller 2
3. A member for transmitting the rotational force of the drive motor 30 to the paper feed roller 25 and the separation roller 26 is used as a first transmission unit, and the drive motor 30
The member that transmits the rotational force of the drive motor 30 to the registration roller 29, the conveyance belt 103, and the paper discharge roller 116
Transmission means.

(Operation) In the above configuration, this device operates as follows.

First, when the document is set on the paper feed stacker 11 with the front surface facing down, the empty sensor 24 detects the document, and the document can be automatically fed.

In such a state, when a sheet feeding button (not shown) of the copying apparatus 1 or the sheet feeding apparatus 10 is pressed, the drive motor 30 rotates forward.

Thereby, the pulley 32, the timing belt 35, the pulley
The rotation shafts 40 and 53 rotate forward via the gears 34 and gears 38, 39, 41, 52 and 54.

(Indicated by solid arrows in FIG. 2.) The forward rotation of the rotating shaft 40 lowers the arm 44, and the pickup roller 23 comes into contact with the document. For this reason, the spring clutch
43 is loaded and slips, the pickup roller 23
Maintain the state of contact with the original.

In addition, the separation roller 26 rotates in the direction for preventing document feeding by the forward rotation of the rotating shaft 40, rejects the document following the document fed by the sheet feeding roller 25, and separates the document into one sheet. .

By the way, since the one-way clutch is interposed in the gear 36, the gear 36 does not rotate when the drive motor 30 rotates forward.

In such a state, if the registration sensor 28 does not detect the leading edge of the document within a predetermined time from the start of sheet feeding, the drive motor 30 is stopped.

By stopping the drive motor 30, the pickup roller 23,
The paper feed roller 25 and the separation roller 26 also stop.

When the drive motor 30 is rotated in the reverse direction by a predetermined amount after a lapse of a minute time, the arm 44 moves up, and the pickup roller 23 separates from the document. When the arm 44 hits the stopper 71, a load is applied to the spring clutch 37, and the gear 38 does not rotate. Therefore, the pickup roller 11 and the paper feed roller 14 are stopped with the pickup roller 11 raised.
On the other hand, the rotation of the rotating shaft 33 is
, The resist roller 29, the transport belt 103, and the paper discharge roller 116 rotate via the gears 56, 57, 46, the transport belt 103, and the round belt 51.

After the reverse rotation is completed, the drive motor 30 is stopped, and the jam display on the copying apparatus 1 or the sheet feeding apparatus 10 (not shown) is turned on.

The operation flow after the occurrence of the jam is shown in the flowchart of FIG.

[Effects of the Invention] According to the paper feeding apparatus according to the present invention, it is possible to easily remove a paper sheet having a poor conveyance and remove a paper sheet on a paper feed stacker at the time of paper conveyance failure. The set can be set so that no inconvenience occurs.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention.
FIG. 1 is a cross-sectional view showing a schematic configuration of a paper feeding device, FIG. 2 is a configuration diagram of a driving device of the paper feeding device, and FIG. 3 is a flowchart showing an example of control. FIG. 4 is a flowchart showing an example of the control. 10 paper feeder, 11 stacker 20 feeding section 23 pickup roller (feeding means) 25 feed roller (rotating body for feeding) (separating means) 26 separation roller (separating body) (Separation means) 28 Registration sensors 29, 29a Registration rollers (registration rotating bodies) 30 Drive motor 100 Transport section (transport section) 110 Paper discharge section (discharge section)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 7/06 B65H 3/06 340 B65H 3/46

Claims (2)

(57) [Claims] A feeder for stacking sheets, a feed roller for feeding the sheet in contact with the uppermost surface of the sheets on the feeder stacker, and bringing the feeder roller into contact with the uppermost surface of the sheets on the feeder stacker. A sheet feeding device comprising: a driving unit that moves to a position separated from the position; and a recognition unit that recognizes a conveyance failure of the paper fed by the feeding unit. While controlling the drive means to move the feeding roller to a position separated from the position contacting the top surface of the sheet by the recognition means having recognized the conveyance failure, and in the direction separating the feeding roller from the top surface of the sheet. A sheet feeding device, further comprising control means for controlling the display means so as to display a conveyance failure after moving by a predetermined amount. 2. A sheet detecting sensor for detecting a sheet is provided downstream of the feeding roller in the feeding direction, and the recognizing means detects the sheet within a predetermined time after the feeding roller starts feeding the sheet. 2. The sheet feeding device according to claim 1, wherein when the sheet is not detected, the sheet is recognized as a sheet conveyance failure.