JPS6242811B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) This invention involves feeding a plurality of originals placed on a paper feed tray one by one onto a platen made of a transparent plate, exposing the originals on the platen, and then exposing the originals to light. The present invention relates to an automatic document feeder that automatically discharges the exposed document.

(Prior art) Documents stacked on a paper feed tray are fed one by one by a paper feed roller between an acceleration roller and a pinch roller pressed against the accelerator roller, and then the documents are reversed and fed onto a platen. An automatic document feeder that performs exposure and discharges the exposed document from a platen is described in, for example, Japanese Utility Model Application Publication No. 110128/1983.

In such a conventional automatic document feeder, when a document gets stuck in the document path from the paper feed section to the platen, it is difficult to remove the document, and the task of removing the document is very troublesome.

(Objective) An object of the present invention is to provide an automatic document feeder that can easily take out a jammed document when the document fed from the paper feed table becomes jammed in the document path leading to the platen. It is about providing.

(Structure) In this invention, a plurality of originals placed on a paper feed table placed above a platen are transferred one by one to an acceleration roller and a friction member pressed against the paper feed roller. In an automatic document feeder that feeds the document between a pinch roller pressed against the platen, and then feeds the document onto a platen via a turn roller by the acceleration roller and pinch roller, the lower paper feeder including the paper feed tray The unit is provided with the paper feed roller and the acceleration roller, while the friction member and the pinch roller are provided in the upper paper feed unit, the paper feed table is made to be freely openable relative to the platen, and the upper paper feed unit is moved downwardly. It is pivoted near the turn roller so that it can be opened freely relative to the side paper feed unit, and when the lower paper feed unit is opened, the upper paper feed unit is integrally connected to the lower paper feed unit. It is designed to rotate around an axis.

(Example) The present invention will be described below with reference to illustrated examples.

In FIG. 1, a plurality of documents 3 are placed on a document placement surface 2 of a paper feed table 1. As shown in FIG. Guides 4 are movably provided on both sides of the paper feed tray 1 to prevent the document 3 from moving in the width direction. A feed auxiliary roller 5 is rotatably attached to the center of the paper feed table 1, and the upper part of the feed auxiliary roller 5 protrudes slightly above the document placement surface 2, so that it can handle multiple documents. It assists in sending out the original 3 by being rotated in the direction of the arrow while contacting the original 3 at the lowest position.

A paper feed roller 6 is arranged near the exit of the paper feed table 1 and is rotated in the direction of the arrow by a driving means.
A roller-shaped friction member 7 is placed on top of the paper feed roller 6 so as to be in pressure contact therewith. This friction roller 7 is normally fixed, but when necessary, it is rotated in the clockwise rotation direction in FIG. 1 to change the contact portion with the paper feed roller 6.
The document 3 on the paper feed tray 1 is moved between the paper feed roller 6 and the friction member 7.
Depending on the situation, the sheets are sent out one by one starting from the lowest position.

An acceleration roller 8 is disposed on the document advancing direction side of the paper feed roller 6 and the friction member 7, and a pinch roller 9 is disposed so as to be in pressure contact with the upper part of the acceleration roller 8. Paper feed roller 6 and acceleration roller 8
Guides 10 and 11 are provided between the two.
The document from the paper feed roller 6 is guided by guides 10 and 11, enters between an acceleration roller 8 and a pinch roller 9, is accelerated by the acceleration roller 8, and is transported.

A turn roller 12 rotated in the direction of the arrow by a drive means and a roller 13 in pressure contact with the turn roller 12 are arranged on the side of the acceleration roller 8 and the pinch roller 9 in the document advancing direction. Acceleration roller 8 and turn roller 1
Guides 14 and 15 are provided between the two. The original from the acceleration roller 8 is transferred to the guides 14 and 15.
, and enters between the turn roller 12 and the roller 13. A turn guide 16 is provided near the turn roller 12, and the document is transported by the turn roller 12 while being guided by the turn guide 16.

An entry guide 17 placed horizontally is provided below the turn guide 16, and the turn roller 12
The original document enters between the conveyor belt 18 and the platen 19 while being guided by the entry guide 17. The conveyor belt 18 is connected to a drive roller 20 located above the entry guide 17 and rotated in the direction of the arrow by a drive means.
and a driven roller 21 located a little away from the end of the platen 19 in the document advancing direction. The conveyor belt 18 has a drive roller 20
As a result, the lower portion moves in the direction of the arrow and conveys the document that has entered from the entry guide 17 onto the platen 19. Near the end of the platen 19 on the driven roller 21 side, a stopper member 22a of a document stopping means 22 for stopping the document is disposed below the conveyor belt 18. This stopper member 22a contacts the conveyor belt 18 for a required period of time, and just before the document reaches the stopper member 22a, the driving force of the conveyor belt 18 is cut off, but the original is conveyed by the conveyor belt 18, which moves due to inertia force. The leading edge of the original is held down to stop the original on the platen 19. Under the platen 19, in addition to a known exposure device, a photosensitive drum, a charging device, a developing device, a transfer device, a fixing device, a cleaning device, and the like are arranged at predetermined positions. The exposure device operates to finish exposing the document stopped on the platen 19. After stopping the original on the platen 19, the tip of the stopper member 22a moves downward upon receiving, for example, a detection signal indicating the end of exposure to release the original.

Next, when the transport belt 18 starts to be driven, the document is transferred and guided by the paper ejection guides 23, 23, and enters between the paper ejection roller rotating in the direction of the arrow and the roller 25 that is in pressure contact with the paper ejection roller. , and a paper ejection roller 27 that is guided by a paper ejection guide 26 and rotated in the direction of the arrow, and a roller 28 that is in pressure contact with the paper ejection roller 27.
The paper passes through the paper discharge guides 29, 29, and is discharged and stored on the paper discharge tray 30.

The paper ejection tray 30 is arranged between the paper feed tray 1 and the conveyor belt 18, and the document to be ejected is placed above the paper ejection tray 30 and passes between the paper feed tray 1 and the conveyor belt 18. A guide 30a is provided so as not to get between the guides 18. When the document is ejected, after the rear end of the document passes between the stopper member 22a and the conveyor belt 18, the stopper member 22a
is raised to contact the conveyor belt 18 and prepare to stop the next document. An exterior body 31 is provided near the turn roller 12 and the roller 13 to cover the motor and the like.

The paper feeding section that feeds the original between the turn roller 12 and the roller 13 is connected to a lower paper feeding unit A that includes a paper feeding table 1, a paper feeding roller 6, an acceleration roller 8, guides 10, 14, etc. It is composed of an upper sheet feeding unit B consisting of a member 7, a pinch roller 9, guides 11 and 15, and the like. Turn roller 1
2, roller 13, conveyor belt 18, drive roller 2
0, a conveyance section is composed of a driven roller 21, discharge rollers 24, 27, rollers 25, 28, etc., and these are supported by a side plate of the conveyance section (not shown).

The lower paper feed unit A is supported by two side plates A1 (one side plate is not shown), and these side plates A1 can be fitted into the side plates of the conveyance unit and are supported by the side plates of the conveyance unit. It is rotatably supported by a support shaft 32. As shown in FIG. 1, the side plate A1 is placed and positioned on a support plate A3 fixed to the side plate of the transport section. Further, as shown in FIG. 2, the side plate A1 can be rotated about the support shaft 32 to a position shown by a constant chain line, and can be fixed at that position. Locking pieces A2 are rotatably attached to the outer sides of both side plates A1 of the lower paper feed unit A, and these locking pieces A2 are arranged so that the side plates A1 are at the positions indicated by solid lines in FIG. In some cases, the free end is open, and when the side plate A1 is rotated to the position shown by the dashed line in FIG. The side plate A1 is supported so that it is stopped and does not move.

Both side plates B1 (one side plate is not shown) of the upper paper feed unit B are formed to have a smaller spacing than the spacing between the both side plates A1 of the lower paper feed unit A, and their tips are on the lower side. It is rotatably supported by a support shaft 32 located inside both side plates A1 of the paper feed unit A and supported by the side plates of the conveying section. The side plate B1 is placed and positioned on a support pin B4 protruding from the inside of the side plate A1. This upper paper feeding unit B also has a second
It can be rotated from the position shown by the solid line in the figure to the position shown by the one-dot chain line and the position shown by the two-dot chain line.
Locking pieces B2 are rotatably attached to the outside of the side plate B1 of the upper paper feed unit B, and these locking pieces B2 are rotated by leaf springs B3, one end of which is fixed to the outside of the side plate B1. In Figure 2, the force is applied in the direction opposite to the rotation direction of the watch. Locking piece B2
is arranged on the outside of the side plate A1, and when the hook B21 at the tip thereof is in contact with the upper paper feed unit B and the lower paper feed unit A, it engages with the pin 34 formed on the outside of the side plate A1. Also, the locking piece B2
By pushing and rotating the upper B23 in the clockwise direction, the tip of the locking piece B2 is released from the pin 34, and the upper paper feed unit B is rotated around the support shaft 32 separately from the lower paper feed unit A. can move. First, rotate the upper paper feed unit B separately from the lower paper feed unit A and move it to the position shown by the two-dot chain line, and then operate the locking piece B2 when it comes into contact with the lower paper feed unit A again. As a result, the hook B21 of the locking piece B2 is locked to the pin 34. Since the upper paper feed unit B and the lower paper feed unit A rotate around the same support shaft 32, they rotate together to the position shown by the dashed line in FIG. 2 and stop there. can be done.

As mentioned above, the lower paper feed unit A, which has the paper feed roller 6 and the acceleration roller 8 and constitutes the paper feed table, is
The upper sheet feeding unit B, which can be opened with respect to the platen 19 and has the friction member 7 and the pinch roller 9, can be opened with respect to the lower sheet feeding unit A. When the paper is opened, the upper paper feed unit B also swings together, but the upper paper feed unit B can be opened independently with respect to the lower paper feed unit A.

Next, the operational relationship of the acceleration roller 8, paper feed roller 6, and feed auxiliary roller 5 will be explained based on FIG.

Acceleration roller shaft 8 to which acceleration roller 8 is fixed
a is rotatably supported by a bearing 8b fixed to the side plate A1, and a transmission roller 35 is fixed to the end thereof. This transmission roller 3
A timing belt 36 is attached to the timing belt 36, and the other end of the timing belt 36 is attached to a belt pulley fixed to a drive shaft of a motor or the like housed in the exterior body 31.
The rotational force of the belt pulley is transmitted to the transmission roller 35. Further, a pinion 37 is attached to the acceleration roller shaft 8a.
is fixed, and an idle gear 38 is arranged to mesh with this pinion 37, and a gear 39 is arranged so as to mesh with this idle gear 38. When the transmission roller 35 rotates in the direction of the arrow, the acceleration roller shaft 8a also rotates in the direction of the arrow, and the acceleration roller 8 and pinion 37 also rotate in the direction of the arrow, so the idle gear 38 rotates in the direction of the arrow and the gear 39 rotates in the direction of the arrow. Rotate to.

A rotating shaft 39a of the gear 39 is fixed to an input shaft of an electromagnetic clutch 40, and a paper feed roller 6a is fixed to an output shaft of the electromagnetic clutch 40. The paper feed roller shaft 6a is supported by a bearing 6b fixed to the side plate A1. Only when current is flowing through the electromagnetic clutch 40, the rotational force of the rotating shaft 39a of the gear 39 is transmitted to the paper feed roller shaft 6a.

A one-way rotating clutch 6c is attached to the paper feed roller shaft 6a.
A paper feed roller 6 is attached via. The one-way rotating clutch 6c is engaged only when the rotation of the paper feed roller 6 in the direction of the arrow is slower than the rotation of the paper feed roller shaft 6a, and when the rotation of the paper feed roller 6 is faster than the rotation of the paper feed roller shaft 6a. are attached so that their engagement separates. Further, a pulley 6d is fixed to the feed roller shaft 6a, and the rotational force of the pulley 6d is transferred to a pulley 5 fixed to the feed auxiliary roller shaft 5a by a transmission means such as a belt 41.
b. The feed auxiliary roller shaft 5a is attached to the side plate A.
1, and a feed auxiliary roller 5 is supported on the feed auxiliary roller shaft 5a.
is fixed.

Turn roller 12, roller 13, drive roller 2
0, the driven roller 21, the paper ejection rollers 24, 27, and the rollers 25, 28 are rotatably supported by the side plate of the conveyance section, and the rotational force of the motor inside the exterior body 31 is transmitted to the turn roller 12 and the drive roller 20. The rotational force of the drive roller 20 is transmitted to the driven roller 21, and the rotational force of the driven roller 21 is transmitted to the discharge rollers 24 and 27.

Next, the outline of paper feeding, conveyance, and paper ejection operations will be explained.

A drive roller 20, a driven roller 21, and a paper ejection roller 24, which start rotation of the motor in response to a print signal of a copying machine or a return signal of an optical means, and simultaneously drive an acceleration roller 8, a turn roller 12, and a conveyor belt 18, 27 starts to rotate. At the same time as the motor starts rotating, or after a required period of time has elapsed, current is applied to the electromagnetic clutch 40 to rotate the feed roller shaft 6a, thereby rotating the feed roller 6 and the feed auxiliary roller 5. After the lowest sheet of paper 3 is fed out, the supply of current to the electromagnetic clutch 40 is stopped, and the rotation of the paper feed roller shaft 6a and the feed auxiliary roller 5 is stopped. While the document is being fed between the paper feed roller 6 and the friction member 7 while the acceleration roller 8 is feeding the document, the paper feed roller 6 idles relative to the paper feed roller shaft 6a. After the time required for conveying and discharging the document by the conveyor belt 18 has elapsed, the rotation of the motor is stopped. By sequentially repeating these operations, the documents are automatically sent out one after another. The order of operations is not limited to that described above, and several examples can be considered.

(Effects) According to the present invention, when a document jam occurs between the paper feed roller and the turn roller, the jammed document can be easily removed by opening only the upper paper feed unit. If the original is jammed between the turn roller and the platen, the jammed original can be removed by opening the paper feed tray containing the lower paper feed unit together with the upper paper feed unit relative to the platen. Therefore, it is possible to solve the problem of document jamming in an automatic document feeder having a paper feed table above the platen.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an automatic document feeder showing an embodiment of the present invention, FIG. 2 is a side view showing a paper feed section of the above device, and FIG. 3 is a schematic side view of the paper feed section of the above device. FIG. 1...Paper feed tray, 3...Document, 6...Paper feed roller, 7...
Friction member, 8... acceleration roller, 9... pinch roller,
12...Turn roller, 19...Platen, A...Lower paper feed unit, B...Upper paper feed unit, B1...Side plate.

Claims (1)

[Scope of Claims] 1. A paper feed table 1 disposed above a platen 19 made of a transparent plate and for placing a plurality of original documents 3 to be copied; A paper feed roller 6 that feeds sheets one by one and a friction member 7 that is pressed against this paper feed roller
and a turn roller 12 that reverses and feeds the document sent out by the paper feed roller onto the platen.
In an automatic document feeder having an acceleration roller 8 that feeds the paper to the paper feed unit A and a pinch roller 9 that is pressed against the paper feed roller 8, by providing the paper feed roller 6 and the acceleration roller 18 on the paper feed table 1, the lower paper feed unit A
, and a pair of side plates B separate from the lower paper feeding unit.
1 is provided with the friction member 7 and the pinch roller 9 to constitute an upper sheet feeding unit B, and the lower sheet feeding unit A is pivoted near the turn roller 12 so as to be freely openable with respect to the platen 19. 32 fixed to the main body, while the upper paper feed unit B is supported by the lower paper feed unit A.
When the lower sheet feeding unit A is opened, the upper sheet feeding unit B is integrally supported by the shaft 32 with the lower sheet feeding unit A. An automatic document feeder characterized by rotating around the .