JPH0749482Y2 - Automatic document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automatic document feeder for carrying a document into a copying machine capable of double-sided copying.

[Conventional technology]

A document feeder shown in FIG. 4 has been proposed as a document feeder of this type.

When the original a to be copied is placed on the original tray 6, the original feeding device feeds the original a into the carry-in entrance of the platen e by the feed roll c and the platen e by the conveyor belt f provided on the platen e. It is conveyed to a predetermined position of e.

Further, when the double-sided copy mode is selected, the copy conveyance belt f reversely rotates, and the original a on which the one-sided copy is completed is fed to the reversal conveyance path g as shown by the broken line arrow, and further from the conveyance path d. The upper and lower surfaces are inverted while being fed onto the platen e again, and the inverted document a is conveyed to a predetermined position of the platen e by the conveyor belt f so that the remaining surface is copied. Has become.

[Problems to be solved by the invention]

The original a is placed on the platen e like the original feeding device.
In the case of a reciprocating type, if there is a step between the platen e and the bottom chute h provided on the original loading side, the leading edge of the original a abuts on this step during the transportation of the original, which causes a paper jam.

For this reason, conventionally, the abutting portion is allowed to move up and down with the center portion of the bottom chute h as a fulcrum so that a step is not generated between the two. However, this operation is delicate, so that the precision of the component parts is improved. There is a problem that it is necessary or requires many steps for adjustment.

Further, when the original a is temporarily stopped in front of the platen e and the position of the original a is corrected, in the case of the original a having a weak waist, the leading end of the original buckles and the stop position cannot be accurately corrected.
When the leading end of the gate i that feeds the document a on the platen e to the reversing conveyance path g moves up and down, the required strokes in the height direction at both ends of the gate differ, which makes it difficult to configure these members. There was also.

[Means and Actions for Solving Problems]

The present invention has been made for the purpose of improving the above-mentioned inconvenience, and a transfer belt which can be freely rotated in the forward and reverse directions is provided above the platen of the copying machine, and a document to be copied on both sides is conveyed to the reversing conveyance path on the document carrying side of the platen. In an automatic document feeder in which a feeding gate is provided so as to be movable up and down, the platen is controlled to a position where the leading end is higher than the platen upper surface and lower than the platen upper surface, in conjunction with the gate, on the original carrying-in side. With the connection member, the tip of the connection member is higher than the platen upper surface when the original is carried into the platen, or lower than the platen upper surface when the original is fed from the platen to the reversing conveyance path. Does not get caught in the edge of the platen or bottom chute and cause a paper jam.

〔Example〕

The present invention will be described in detail with reference to one embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a main body of the apparatus provided above a platen 3 of a copying machine 2 and an original tray 5 on which an original 4 to be copied is placed. The original document 4 placed on the original document tray 5 is fed by a feed roll 6 into a conveying path 7.

The conveyance path 7 is provided with a conveyance roll 8 and a skew correction roll 9 for correcting the skew of the original 4 and the like.
As shown in FIG. 2, in the middle of the bottom chute 10 that connects the conveyance path 7 and the platen 3, there is a platen conveyance roll 11 that conveys the original 4 to the platen 3, and a connecting member is provided at the connection between the bottom chute 10 and the platen 3. Twelve are provided.

The connection member 12 has a base end side pivotally attached to the bottom chute 10 side by a shaft pin 13 and a tip end side vertically movable, and one end of which is a biasing means such as a leaf spring fixed to the bottom surface of the bottom chute 10. The tip end of the connecting member 12 is always urged upward by the other end side of 14.

Further, a groove 12a is formed on the upper surface of the connecting member 12 in the entire width direction, and an elastic body 1 such as rubber is formed in the lower portion of the groove 12a.
5 is laid, and the upper surface of the connection member 12 on the tip side is inclined toward the platen 3 side so as to descend forward.

On the other hand, the original 4 to be copied is carried onto the platen 3 to the copy position on the platen 3, and after the copying, it is carried out from the platen 3 to the discharge tray 16 or, in the double-sided copy mode, the one-sided copy is completed. A conveyor belt 18 that conveys 4 to the reversing conveyor path 17 is provided so as to be rotatable in the forward and reverse directions.

The reversing conveyance path 17 forms a loop with the conveyance path 7, a conveyance roll 19 is provided in the middle, and a gate 20 is provided at the end on the platen 3 side.

The gate 20 has a substantially fan-shaped cross section, and an arcuate base end portion thereof is fixed to a gate drive shaft 21 so that the gate drive shaft 21 pivots the tip side in the vertical direction.

Further, on both sides of the gate 20, side guides 22 and side frames 23 for contacting the side edges of the original 4 and performing side registration of the original 4 are provided, and the tip side of the gate 20 is shown in FIG. It is shaped like a comb and has a tip
The bottom surface of 20a is in contact with the elastic body 15 laid in the groove 12a of the connecting member 12 from above.

Further, a gate portion 20b for temporarily stopping the leading edge of the original 4 is formed at the leading edge of the gate 20.

Next, the operation will be described. When the original 4 to be copied is placed on the original tray 5, the original 4 is fed by the feed roll 6.
Is sent to the conveying path 7 and reaches the gate 20 through the bottom chute 10.

At this time, the gate 20 is in the closed position as shown by the solid line in FIG.
The stop position is corrected by touching b.

Thereafter, the pinch roll 11a provided below the platen transport roll 11 rises to nip the document 4 with the platen transport roll 11 and at the same time the gate 20 opens to the position shown by the phantom line in FIG. As the document 4 is started to be loaded by the transport rolls 11 and the gate 20 is opened, the tip of the connecting member 12 which has been pushed down to the solid line position in FIG. Since it is raised to a position higher than the upper surface of the platen 3,
The leading edge of the original 4 is sent between the platen 3 and the conveyor belt 18 without being caught by the end of the platen 3, and is conveyed to the copy position by the conveyor belt 8.

When copying is completed, if the single-sided copy mode is selected, the sheet is conveyed to the paper discharge tray 16 by the conveyor belt 18, but if the double-sided copy mode is selected, the conveyor belt 18 reverses to rotate the original document 4. Is sent to the loading side.

At this time, since the gate 20 is rotated from the imaginary line position in FIG. 2 to the solid line position and pushes the tip of the connecting member 12 to a position lower than the upper surface of the platen 3, the leading edge of the original 4 is the leading edge of the connecting member 12. It reaches the gate 20 without hitting, and is guided to the upper surface 20c of the gate 20 and fed into the reversing conveyance path 17.

The original 4 fed into the reversing conveyance path 17 is reversed upside down while reaching the gate 20 through the conveyance path 7, and when the gate 20 is opened, the platen 3 is conveyed by the conveyance belt 18 with the surface already copied up. It is carried in above.

When the copying of the remaining surface is completed, it is ejected to the paper ejection tray 16 by the conveyor belt 18.

The double-sided copy original 4 is automatically carried in by repeating the following operation. The lower surface 20d of the gate 20 is inclined so that the distance between the lower surface 20d and the bottom chute 10 becomes narrower toward the leading end side. When the stop position of the document 4 is corrected by abutting the leading end of the document 4 on the document 4, it is possible to prevent the document 4 from buckling even if the document 4 has a weak waist, and therefore accurate position correction can be performed.

In addition, an elastic body such as rubber is used for the contact portion between the connecting member 12 and the gate 20.
Since 4 is provided, the original document 4 that is attached to the gate portion 20b 4
It is also possible to prevent the tip of the squirrel from slipping between them.

[Effect of device]

As described in detail above, the present invention provides a connecting member whose tip is moved up and down by a gate for feeding an original to a reversing conveyance path during double-sided copying, between a platen and a bottom chute provided between the conveyance path and a platen. Since the tip of the connecting member is higher than the upper surface of the platen when the original is carried into the platen and is lower when the original is fed from the platen to the reversing conveyance path, the leading edge of the original is the end of the platen. It is possible to eliminate problems such as paper jams caused by catching on the edges of the bottom chute and the bottom chute, and because the gate forcibly moves the connecting member up and down, it is not necessary to adjust the position of the member or members with high accuracy.

Also, since the gate and connection member are separate, even if a paper jam occurs at this part, the connection member will remain in that position when the conveyor belt and gate are lifted, so the original with the paper jam will be removed. Can be easily removed.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall schematic configuration diagram, FIG. 2 is an enlarged view of a circle in FIG. 1 II, and FIG. 3 is an arrow view in the direction III-III of FIG. FIG. 4 and FIG. 4 are conventional explanatory views. 2 is a copying machine, 3 is a platen, 4 is a document, 12 is a connecting member,
17 is a reversing conveyance path, 18 is a conveyance belt, and 20 is a gate.

Claims (1)

[Scope of utility model registration request] 1. A conveyer belt 18 is provided above the platen 3 of the copying machine 2 so as to be freely rotatable in the forward and reverse directions, and a gate 20 for feeding a document 4 to be copied on both sides to a reversing conveyer path 17 is provided on the document carry-in side of the platen 3. In an automatic document feeder provided so as to be movable up and down, the gate 20 is provided on the document loading side of the platen 3.
In conjunction with the position where the tip is higher than the upper surface of the platen 3,
Connection member controlled to a position lower than the upper surface of the platen 3
An automatic document feeder which is provided with 12.