JPH02178127A - Sheet feeder - Google Patents

Abstract

PURPOSE:To make control and structure into simplification as well as to reduce the capacity of power supply by installing a mobile means for moving a rotor to a position where it comes into contact with each of loaded sheets with turning effort in the specified direction of a driving means and also moving the rotor to another position where it separates from the loaded sheets with the turning effort in the reverse direction. CONSTITUTION:Original paper feeding operation is started only when an original detecting sensor is ON as well as an original tip detecting sensor is ON, and a motor 2 is driven clockwise, and a pickup roller (rotor) 16 goes down by a mobile means 50 as rotating, whereby it comes into contact with each of loaded sheets, starting the feed of an original 1. Next, when this original 1 is detected by the original tip detecting sensor, the driving direction of the motor 2 is reversed, so that the pickup roller 16 goes up via the mobile means 50 and its rotation is also stopped, thus a timer is set. After the elapse of set time of this timer, reading of an image is started.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for feeding originals in image reading devices such as copying machines and facsimiles, and is used in copying machines and various printers such as laser beam printers and thermal transfer printers. The present invention relates to a sheet feeding device used to feed sheets of paper, resin film, etc. to an image forming section.

[Conventional technology]

In conventional sheet feeding devices, a solenoid is used as a driving source for bringing the pickup roller into contact with and away from the sheet, as described in JP-A No. 48-96023, or as described in JP-A No. 62-19330. A cam was used as described in the issue.

[Problem that the invention is trying to solve] However,
The conventional example disclosed in JP-A No. 48-96023 has a solenoid for separating the pickup roller from the sheet, in addition to a drive source for rotating the pickup roller. Also, special public service in 1986
In the conventional example disclosed in No. 19330, a drive source and a pickup roller, and a cam for separating the drive source and the pickup roller are each connected by a clutch.

In all of the above conventional examples, solenoids, clutches, etc. are used to rotate the pickup roller and to separate (contact) the pickup roller from the sheet, which (1) complicates control.

(2) The capacity of the power supply must be increased.

(3) The mechanism becomes complicated.

There were some problems.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a sheet feeding device whose structure and control can be easily simplified and whose overall load is small.

The configuration of the present invention that achieves the above object includes a loading means for loading sheets, a rotating body for feeding the sheets loaded on the loading means, and generating rotational force in a predetermined direction and in a direction opposite to the predetermined direction. a driving force transmitting means for transmitting only the rotational force of the driving means in the predetermined direction to the rotating body;
Movement in which the rotating body is moved to a position in contact with the stacked sheets by the rotational force in the predetermined direction of the driving means, and the rotating body is moved to a position away from the stacked sheets by the rotational force in the opposite direction. A sheet feeding device comprising: means.

[Means for solving the problem (and operation)] According to the present invention, the pickup roller constituting the paper feeding section is moved up and down by switching between forward and reverse rotation of the motor, so that it can be driven by a single motor. This device is designed to drive an automatic document feeder that can be used.

〔Example〕

FIG. 1 shows a schematic perspective view of a first embodiment in which the present invention is applied to an automatic document feeder, FIG. 2 is a sectional view of the automatic document feeder, and FIG. 3 is a schematic diagram showing a drive system. .

In the figure, 1 is a document as a sheet, 2 is a motor that drives the entire device, 3 is a belt that transmits the drive of the motor, 4 is a pulley, and 5 is attached coaxially with pulley 4 and rotates in the same direction as pulley 4. 6 is a gear that meshes with gear 5, 7 is a friction pad attached to gear 6, 8 is a friction link, 9 is a spring that presses friction link 8 against friction pad 7, IO is collar 11, and the drive is obtained from gear 6. 22 is a drive shaft that rotates by receiving drive from the pulley 4, 23 is a gear attached to the drive shaft 22, 24 is a gear that meshes with the gear 23, and 25 is a paper delivery roller that meshes with the gear 24. gear attached to shaft 11, 15
is a one-way clutch that transmits rotation in only one direction and slips in the opposite direction, and two one-way clutches 15a and 15b are attached to the discharge roller shaft 11.

10 is a collar attached to the discharge roller shaft 11 and presses the spring 9; 13 is a swing shaft; 12 is a swing plate that is attached to the swing shaft 13 and is engaged with the friction link 8 to swing; 16 is a collar for holding the original 1; The retractable pickup roller 17 is a pickup roller shaft, 18 is an arm that supports the pickup roller shaft 18, and 14 is a support plate that is attached to the swing shaft 13 and moves the arm 18 up and down by the movement of the swing shaft 13.

26 is a pulley attached to the shaft 11 so as to rotate in the same direction as the gear 6, 27 is a belt that transmits the rotation of the pulley 26, and 20 is a paper feed shaft that transmits the rotation of the pulley 28 via the one-way clutch 15c. , 19 is a paper feed roller attached to the paper feed shaft 20, 29 is a pulley attached to the paper feed shaft 20, 30 is a belt 31 that transmits the rotation of the pulley 29, and is attached to the pickup roller shaft 17 to transmit the rotation of the belt 30. This is a pulley that transmits the information to the pickup roller shaft 17.

32 is a gear attached to the paper discharge roller shaft 11 and rotates in the same direction as the paper discharge roller shaft II; 33 is a gear that meshes with the gear 32; 34 is a pulley that rotates in the same direction as 33;
35 is a belt that transmits the rotation of the pulley 34; 36 is a pulley that transmits the rotation of the belt 35; 37 is a transmission shaft that transmits the rotation of the pulley 36; 38 is a pulley that is attached to the transmission shaft 38 and transmits the rotation of the transmission shaft; 39 is a belt that transmits the rotation of the pulley 38; 40 is a pulley that transmits the rotation of the belt 39; 41 is a separation drive shaft; 42 is attached to the separation drive shaft 41; 43 is a reversing roller.

44 is a pulley attached to the paper ejection roller shaft 11 and rotates in the same direction as the paper ejection roller shaft 11; 45 is a pulley 44;
46 is a pulley that transmits the rotation of the belt 45, 47 is a transport roller shaft, 48 is a transport roller, 49 is a paper ejection roller, and pickup roller 16
Reference numeral 50 is an actuating means for moving up and down.

The operation of the automatic document feeder will be described below with reference to the drawings.

When the original 1 is inserted into the paper feed slot A, the original detection lever 51 attached to the swing shaft 13 rotates clockwise around the swing shaft 13, the presence of the original is detected by the original detection sensor 52, and the motor is activated. 2 is the forward rotation direction (solid arrow direction in the figure)
, and is transmitted to the belt 3, pulley 4, gear 5, and gear 6, and then to the paper discharge roller shaft 11 via the one-way clutch 15a. Also, motor 2 is driven by pulley 4.
It is transmitted from the drive shaft 22 to gear 23, gear 24, gear 2.
5. It is also transmitted to the paper discharge roller shaft 11 via the one-way clutch 15. Drive is transmitted in opposite directions from the right and left sides of the paper ejection roller shaft ll, but since one-way clutches 15a and 15b are attached to both sides, when the drive is transmitted from one side, the other one is in a sliding state. Therefore, the paper discharge roller shaft 11 is always driven in one direction. When the motor 2 is rotating in the normal rotation direction, the one-way clutch 15a on the gear 6 side is in the sliding direction and does not transmit driving force, and the one-way clutch 15a on the gear 25 side
It is attached so that b is the direction in which the driving force is transmitted.

The rotation of the gear 6 is caused by the friction pad 7, the friction link 8, and the rocking plate 1.
2. The movement is transmitted via the swing shaft 13 so that the tip of the support plate 14 moves in a downward direction.

When the tip of the support plate 14 is lowered, the arm 18 swings around the paper feed shaft 20 to lower the tip, and the pickup roller 1
6 comes into contact with the document l under its own weight.

A pulley 26 and a belt 27 that rotate in the same direction as the gear 6,
Pulley 28, one-way clutch 15c, paper feed roller 19 via paper feed shaft 20, further pulley 29, belt 3
0. Pulley 31. The rotation of the motor 2 is transmitted to the pickup roller 16 via the pickup roller shaft I7, and the pickup roller 16 rotates in the direction of the solid line arrow in FIG.

The rotation of the discharge roller shaft 11 is transmitted to the separation roller 43 via a gear 32, a gear 33, a pulley 34, a belt 35, a pulley 36, a transmission shaft 37, a pulley 38, a belt 39, a pulley 40, a separation drive shaft 411, and a torque limiter 42. is,
The separation roller 43 rotates in the direction of the solid arrow.

Further, the rotation of the discharge roller shaft 11 is transmitted to the conveyance roller 48 via the pulley 44, belt 45, pulley 46, and conveyance roller shaft 47, and the conveyance roller 48 rotates in the direction of the solid arrow.

When the pickup roller 16 rotates and lowers onto the document l and comes into contact with the document 1, the document l is transferred to the paper feed roller 1.
9, the sample is sent to a separating section composed of a separating roller 43 and the like. The document 1 is separated into sheets one by one by the paper feed roller 19 and separation roller 43, and is conveyed by the conveyance roller 48 and conveyance roller 53.
5 until the document leading edge detection sensor 56 is OFF.
F and is detected.

The document leading edge detection lever 54 is attached by a spring 57 so that its leading edge abuts against a hole 59 in a paper feed guide 58 . When the document l is detected by the document leading edge detection sensor 56, the rotation direction of the motor l is reversed (in the direction of the dotted arrow in the figure), and the belt 3, pulley 4, gear 5, pulley 6,
The booby drive shaft 22, gear 23, gear 24, gear 25, pulley 26, belt 27, and pulley 28 rotate in the opposite direction (in the direction of the dotted arrow in the figure).

At this time, since rotation is being transmitted in the sliding direction to the one-way clutch 15c attached to the paper feed shaft 20, no drive is transmitted to the paper feed shaft 20. Paper ejection roller shaft 11
The one-way clutch 15b on the gear 25 side is in the sliding direction, and the one-way clutch 15a on the gear 6 side is in the drive transmission direction, and even if the rotational direction of the motor 2 changes, the rotational direction of the paper discharge roller shaft 11 does not change. Since the rotation direction of the gear 6 is reversed, the friction pad 7, friction link 8, and rocking plate 12
, the tip of the support plate 14 moves upward via the swing shaft 13, and the pick-up lobe 16 separates from the document l. The movement range of the rocking plate 12 is regulated by a stopper 21, and when the rocking plate 12 hits the stopper 21, the friction pad 7 and the friction link 9 slide, and the rocking shaft 13 is prevented from rotating any further.

From the paper ejection roller shaft 11 to the gear 32, gear 33, and pulley 3
4, belt 35, pulley 36, transmission shaft 37, pulley 38
, a belt 39, a pulley 40, a separation roller shaft 42, and a separation roller pulley 4 that rotates via a torque limiter 42.
4. The belt 45, the pulley 46, the conveyance roller rotating via the conveyance roller shaft, and the paper ejection roller 49 are driven by the motor 2.
It doesn't matter the direction of rotation (rotates in a constant direction).

When the motor 2 rotates in reverse and a certain period of time t has elapsed, the image reading device 100 starts reading the image.

When the document l passes the document leading edge detection lever 54, the document leading edge detection lever 54 is rotated around the rotating shaft 55 by the spring 57, and the leading edge hits the hole 59 of the paper feed guide 58, and the document leading edge detection sensor is turned on. Become.

After a further certain period of time t has elapsed, image reading ends,
After a time t3 has elapsed during which the document l is conveyed by the paper ejection rollers 49 and the paper ejection rollers 60 and arrives at the paper ejection tray 61, the motor 2 stops. If there are documents remaining on the paper feed tray 62,
Since the document sensor 52 remains ON, the motor I is driven, and the above operation is repeated until there is no document I left on the paper feed tray 62 and the document sensor 52 is turned OFF.

If the processing in the above configuration is illustrated in the block diagram of FIG. 4, it is detected that there is no document, and the document supply operation is not started (step 816). If the document detection sensor 52 is ON and the document leading edge detection sensor 56 is OFF, this indicates that the document remains in the document transport path, and the document supply operation does not start. The document feeding operation is started only when the document detection sensor 52 is ON and the document leading edge detection sensor 56 is ON, the motor 2 is driven in forward rotation (step S3), and the pickup roller 16 rotates downward and starts supplying the document. do.

When the document 1 is detected by the document leading edge detection sensor 56 (step S4), the drive direction of the motor 2 is reversed (step S5), the pickup roller 16 is raised and its rotation is stopped, and the timer 1 is set (step S6). ).

The elapse of the predetermined time t1 is detected by the timer 1 (step S7), and the image reading means 100a of the image reading device 100 starts reading the image (step S8).
. When the trailing edge of the document 1 passes the document leading edge detection lever 54, the document leading edge detection sensor 56 is turned on (step S9).
, timer 2 is set (step 510). Step 5: The timer 2 detects the passage of a certain period of time t.
it), the image reading by the image reading device 100 ends (step 512). Furthermore, after a certain period of time t2 has elapsed (step 513), the motor 2 stops (step 5).
14).

If the document detection sensor is ON, the document feeding operation is started again (step 515) until the document detection sensor is turned OFF (repeat).

As described above, by vertically moving the pickup roller 16 that supplies the document 1 by rotating the motor 2 in the forward and reverse directions via the actuating member 50, it is possible to move the pickup roller 16 for feeding the original 1 without using a driving means such as a solenoid.

[Embodiment 2] As shown in FIG. 6, the swing plate 12 may be made of a member having spring properties, and the swing plate 12 itself may be pressed against the friction pad 7.

The rotation of the gear 6 is directly transmitted from the friction pad 7 to the rocking plate 12, and the rotational motion of the gear 6 is converted into a reciprocating motion.

The reciprocating motion of the rocking plate 12 is converted into the vertical motion of the pickup roller 16 via the rocking shaft 13, the support plate 14, and the arm 18.

The operation and processing of the automatic document feeder are the same as in the first embodiment.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily simplify the configuration and control, and to obtain a sheet feeding device with a small overall load.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an automatic document feeder embodying the present invention, FIG. 2 is a schematic sectional view of an automatic document feeder embodying the present invention, and FIG. 3 is a schematic sectional view of an automatic document feeder embodying the present invention. FIG. 4 is a block diagram showing the operation of an automatic document feeder embodying the present invention; FIG. 5 is a flow chart of the present invention; and FIG. 6 is a diagram showing another embodiment. 2... Motor 3... Belt 4... Pulley 5... Gear 6... Gear 7... Friction pad 8... Friction link 9... Spring 10... Collar 11...・Discharge roller shaft 12...Swing plate 13...Swing shaft 21...Stopper 50...Operating means

Claims (1)

[Scope of Claims] A loading means for loading sheets; a rotating body for feeding the sheets loaded on the loading means; and a driving means capable of generating rotational force in a predetermined direction and in a direction opposite to the predetermined direction. , a driving force transmitting means for transmitting only the rotational force of the driving means in the predetermined direction to the rotary body; and a driving force transmitting means for transmitting only the rotational force of the driving means in the predetermined direction to move the rotary body to a position where it contacts the stacked sheets. , a moving means for moving the rotating body to a position away from the stacked sheets by the rotational force in the opposite direction.