JPH066127Y2 - Automatic document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of an automatic document feeder for automatically conveying a document to a copying machine or the like.

[Conventional technology]

Conventionally, in an automatic document feeder that automatically conveys a document to be copied onto a platen such as a copying machine, the document is positively applied to the registration guide in order to correct skew and side registration deviation that occur during the conveyance. ,
A correction roll that conveys the document along this is provided on the conveyance path.

As shown in FIG. 12, the correction roll a is installed so as to be inclined to the registration guide d side by a certain angle with respect to the conveyance direction c of the document b, and the skewed document b is registered by the correction roll a. The skew of the original document b is corrected by bringing it into contact with d.

[Problems to be solved by the invention]

The conventional correction roll a described above can correct the skew of the original document b when the original document b is conveyed in one direction. However, in the original document feeder that conveys the original document b to a copying machine capable of double-sided copying of the original document b, The original document b may reciprocate on the transport path, and when the conventional correction roll a is provided on such a transport path, the skew of the original document b cannot be corrected in the transport direction e of the original document b.

[Means and Actions for Solving Problems]

The present invention has been made for the purpose of improving the above-mentioned problems, and in a document in which a document accommodated on a copy tray is conveyed to a platen of a copying machine through a plurality of transport paths, the document is reciprocated in the transport path. By providing a correction roll in the middle of the moving conveyance path so that the lateral direction of the original can be set to at least two directions with respect to the conveying direction of the original, skew can be corrected in either of the reciprocating directions. The present invention intends to provide the automatic document feeder.

〔Example〕

 This invention will be described in detail with reference to the embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a main body of the apparatus installed above a platen 3 of a copying machine 2 and has a document tray 5 capable of accommodating documents 4 to be copied in an overlapped state. The sheets 4 are fed one by one from the bottom by the feed roll 6 to the conveying path 7.

The transport path 7 is curved in an arc shape and reaches the original carrying-in side of the platen 3, and a correction mechanism 8, a transport roll 9, and a registration gate 10 described later are provided in the transport path 7.
Etc. are provided.

The conveyance path 7 is branched into two paths near the feed roll 6, and the branched conveyance path 11 also reaches the original carry-in side of the platen 3, and the original 4 to be copied on one side is fed from the conveyance path 11 to the platen 3. 3, a transfer path switching gate 12 is provided at a branch portion of the transfer path 11, and a transfer roll 12 and a registration gate 13 are provided in the middle.

On the other hand, the correction mechanism 8 has a correction roll 15 and an idle roll 16 for pressing the original 4 against the correction roll 15, as shown in FIGS. Both ends of the correction roll 15 are fixed to a drive shaft 18 which is horizontally supported by a movable frame 17. The movable frame 17 has a substantially U-shape with an open upper side, and a support shaft 17a protruding on the bottom surface is connected to an upper clutch 20a of a one-way clutch 20 provided on a fixed frame 19.

The one-way clutch 20 has upper and lower clutches 20a and 20b in opposite engagement directions in a cylindrical case 20c rotatably supported by a fixed frame 19, and the lower clutch 20b has a fixed frame 19a. The upper end of the shaft 20a of the large gear 21 supported on the bottom of the is connected.

The large gear 21 has the axis 12 of the one-way clutch 20.
Bearing bracket 1 of movable frame 17 so that it is parallel to
7b is a rotatably supported transmission shaft 22 and a small gear 2 at the lower end
3 is fitted.

A bevel gear 25 fitted to a bevel gear 24 fixed to the drive shaft 18 is provided at the upper end of the transmission shaft 22. The bevel gear 25 transmits the rotation in the directions A and B transmitted from a drive system (not shown) as a large gear. The transmission speed is reduced to 21.

In the figure, reference numeral 26 is a stopper pin that restricts the movable range of the movable frame 17, and the tip thereof is fitted into an arc-shaped elongated hole 17c centered on a support shaft 17a provided in the movable frame 17, and in the transport path 7. The inclination angle of the correction roll 15 is restricted to the positions shown in FIGS. 5 and 6 with respect to the document conveying directions a and b.

Next, the operation will be described. When the original 4 to be copied is placed on the original tray 5 and the copy start button is pressed to perform single-sided copying of the original 4, the original 4 is once fed to the conveyance path 7 by the feed roll 6. After that, the correction roll 15 and the transport roll 9 reversely rotate together with the switching of the switching gate 12, and the original 4 is sent to the platen 3 via the transport path 11 and copied, but on the transport path 7. As a result, the document 4 is reciprocated in the directions of arrows a and b.

Then, the correction mechanism 8 corrects the skew as follows.

That is, when the document 4 is being conveyed in the direction of arrow A,
The drive shaft 18 of the correction roll 15 is rotated in the direction of arrow A by a drive system (not shown), and this rotation is transmitted from the transmission shaft 22 to the one-way clutch 20 via the small gear 23 and the large gear 21 to drive the one-way clutch 20. The movable frame 17 is rotated via the.

As a result, the correction roll 15 moves in the fifth direction with respect to the conveyance direction B.
At the position shown in the figure, the skewed document 4 is laterally aligned with the registration guide 14 to correct the skew.

The one-way clutch 20 transmits the rotation of the transmission shaft 22 to the movable frame 17. However, when the load exceeds a certain load, that is, the stopper pin 26 has an elongated hole 17c in the movable frame 17.
A structure is employed in which the movable frame 17 idles when the ends thereof come into contact with each other and cannot rotate further.

Next, when the correction roll 15 is rotated in the reverse direction of the conveyance direction, the rotation of the drive shaft 18 in the direction of arrow B causes the transmission shaft 2 to rotate.
2 is transmitted to the small gear 23 and the large gear 21 is transmitted to the one-way clutch 20, whereby the movable frame 17 is rotated in the opposite direction to the position shown in FIG. As a result, the original 4 can be fed to the platen 3 of the copying machine 2 via the conveyance path 11 while being laterally aligned with the registration gate 14.

The above is the case of single-sided copying, but in the case of double-sided copying, the original 4 whose single-sided copying has been completed is fed from the conveying path 11 through the conveying path 7 onto the platen 3 so that the upper and lower surfaces of the original 4 are reversed. , Both sides of the original 4 are copied.

7 to 11 show another embodiment,
This will be described next. In FIGS. 7 and 8, correction rolls 15 having inclinations reversed with respect to the transport directions a and b are provided, and they are simultaneously rotated in the opposite directions, so that the correction rolls 15 are placed above them. By selectively pressing the provided idle roll 16 against the correction roll 15, the skew can be corrected in any of the conveyance directions a and b.

That is, when the document 4 is conveyed in the direction of arrow A, the idle roll 16 on the right side of FIGS.
When the original 4 is pulled toward the arrow a'side by pressing it to correct the skew by the registration guide 14 and the sheet is conveyed in the arrow B direction, the left idle roll 16 is pressed into contact with the document 4 in the arrow B'direction. The skew is corrected by pulling it to.

Further, in FIGS. 9 to 11, a drive motor 30 such as a step motor is provided below the movable frame 17 supporting the correction roll 15, and the drive motor 30 moves the correction roll 15 according to the conveying direction of the original 4. Figure 10 or 1st
It is adapted to rotate to the position shown in FIG.

In this case, the angle on the idle roll 16 side may be changed.

[Effect of device]

As described in detail above, according to the present invention, the correction roll is provided on the document transport path so that the lateral direction of the document can be set in two or more directions with respect to the document transport direction.
It is possible to correct the skew in any direction of the document that reciprocates on the transport path. Further, since the skew is corrected by pulling the original toward the registration guide side by the correction roll rotated by the drive system, the skew of the original can be surely corrected in a short distance and the conveying direction of the original is changed. In this case, a part of the driving force of the correction roll is transmitted to the movable frame, and the direction of the correction roll is changed by the driving force. The skew of the original can be corrected without causing jamming.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall schematic configuration diagram, FIG. 2 is a sectional view of a correction mechanism, FIG. 3 is a plan view of the same, and FIG. FIGS. 5, 5 and 6 are explanatory views of the operation, FIGS. 7 to 11 are explanatory views showing another embodiment, and FIG. 12 is a conventional explanatory view. 2 is a copying machine, 3 is a platen, 4 is a document, 5 is a document tray, 7 and 11 are conveyance paths, and 15 is a correction roll.

Claims (1)

[Scope of utility model registration request] 1. An automatic document feeder for loading and unloading a document 4 stored on a document tray 5 onto and from a platen 3 of a copying machine 2 via transport paths 7 and 11, and the document 4 of the carry-in paths 7 and 11. A correction roll 15 rotatably driven by a drive system and rotatably supported by a movable frame 17 is provided in the middle of the conveyance path 7 in which the correction roll 15 is reciprocated, and a part of the driving force for driving the correction roll 15 is provided. , The power transmission shaft 22 and the pair of one-way clutches 20 with opposite engagement directions
An automatic document feeder which can convert the lateral direction of the document by the correction roll 15 into two directions according to the rotation direction of the correction roll 15 by transmitting the rotation frame 17 via a and 20b.