JPH04261555A - Copying device - Google Patents

Abstract

PURPOSE:To obtain a copying device capable of copying plural parts from an original even in the case that a large-sized original is copied by synchronous exposure. CONSTITUTION:The device is provided with carrying means 11 and 12 for making an original sheet 3 enter an exposure surface 4 and an exposure means 5 for synchronously exposuring the original sheet which is moving on the exposure surface, and also the device is provided with the nearly closed loop type circulating carrying path 16 for pulling out the original sheet after the exposure is finished from the downstream side of the exposure surface and for returning the sheet on the upper stream side and then making the sheet enter the exposure surface again, so that the original sheet can be circulatingly and repeatedly supplied to the exposure surface 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying apparatus that can easily and quickly make multiple copies of an original longer than the exposure surface.

0002

[Prior Art] Conventionally, originals longer than the exposed surface (hereinafter referred to as "large-size originals") have been copied using a copying machine that can select between a scanning exposure copying method and a synchronous exposure copying method, and selecting the synchronous exposure copying method. did. That is, the scanning exposure copying method is a method in which an original is held still on an exposure surface (platen glass) and an exposure means is moved, and portions of the original that protrude from the exposure surface cannot be exposed. On the other hand, the synchronous exposure method is a method in which the exposure means is kept stationary at a set position on the exposure surface and the document is moved, so that the entire range of the document is exposed.

0003

[Problem to be Solved by the Invention] However, in conventional devices, large-size originals are ejected and put away after synchronous exposure, so when a user wants to copy multiple copies in succession, the user has to copy only the required number of copies. It was necessary to repeat manual operations such as resetting the original, which was not only troublesome but also took a lot of time to copy.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems, and provides a novel copying device that can continuously make multiple copies of a large-sized original without requiring manual labor by the user. It is an object.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a copying machine equipped with a conveyance means for advancing a sheet to an exposure surface, and an exposure means for synchronously exposing the sheet moving on the exposure surface. In the apparatus, a circulating conveyance path is provided in which the exposed sheet is taken out from the downstream side of the exposure surface, returned to the upstream side, and then enters the exposure surface again, and a plurality of copies are continuously made while the sheet is repeatedly circulated on the exposure surface. It is structured so that it can be created by

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained based on examples with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional front view of a first embodiment of the copying apparatus of the present invention. In the figure, 1 is the main body, 2 is a stacker, 3 is a plurality of large size originals (sheets) stacked on the stacker 2, 4 is an exposure surface (platen glass), and 5 is a movement on the underside of the exposure surface 4. This is an exposure means that can be provided. The exposure means 5 is capable of scanning exposure copying when copying a sheet with the same length as the exposure surface 4 or shorter, and selects the large size mode button 7a on the operation panel 6 (for example, under normal conditions, scanning exposure, pressing operation synchronous exposure mode) enables synchronous exposure copying.

8 is a delivery roller for the sheet 3 on the stacker 2; 9 is a separating means for preventing double feeding of sheets; 10 is an entry path for advancing one separated sheet toward the exposure surface 4; 11; Reference numeral 11' denotes a roller conveyance means provided in the middle of the approach path 10, and 12 denotes a belt conveyance means provided on the exposure surface 4. That is, one sheet separated by the separating means 9 is transferred to the exposure surface 4 by the cooperative operation of the roller conveyance means 11 and 11' provided in the middle of the entrance path 10 and the belt conveyance means 12 on the exposure surface 4. Approach at the set speed.

Reference numeral 13 denotes a first sensor installed near the exit of the entry path 10. When the first sensor 13 detects the leading edge of the entry sheet, it starts counting a timer (not shown) of the exposure means 5, and When the tip reaches the exposure means 5, exposure is started by counting up. Further, when the first sensor 13 detects the trailing edge of the sheet, it ends the exposure after a specific time (time until the trailing edge reaches the exposure means 5).

Reference numeral 14 denotes a paper discharge roller provided on the downstream side of the exposure surface 4, 15 indicates a paper discharge tray, and 16 indicates a stacker on which the exposed sheet is taken out by the belt conveying means 12 and the paper discharge roller 14, and the sheets are stacked thereon. This is a substantially closed-loop circulation conveyance path in which the conveyance is returned to the upstream side via the lower part of the image forming apparatus 2 and then enters the exposure surface again. A switching claw 17 for switching between a discharge sheet and a circulation sheet is provided at the entrance of the circulation conveyance path 16. This switching claw 17 is used for the circulation conveyance path 1 within the set number of copies during copying.
6 is opened, and when the set number of copies is completed, the paper discharge tray 15 side is opened. 18, 18' are circulation conveyance route 1
This is a roller conveying means provided in the middle of 6.

Reference numeral 19 indicates the exposure surface 4 in order to accommodate double-sided originals.
A reversing path 19a is provided on the upstream side of the reversing path 19, a tongue-like member 19a prevents the sheet fed backward from the exposure surface 4 and sent into the reversing path 19 from entering the entrance path 10, and 20 and 20' are provided in the middle of the reversing path 19. A roller conveying means is provided. In the reversal mode, the belt conveying means 12 and the paper ejection roller 14 are configured to reverse at the same time as exposure ends, and after single-sided exposure, the sheet is reversely conveyed and guided to the reversal path 19, and the sheet is guided to the reversal path 19.
It is possible to enter the exposure surface 4 again from zero.

Reference numeral 21 denotes sheet bending detection means, and the sheet bending detection means 21 has second sensors 21a and 21b installed on both sides of the first passage 10 at positions wider than the maximum width of the sheet, as shown in FIG. It becomes. That is, if the sheet bends as shown by the two-dot chain line during repeated movement, this is detected and a certain process, for example, the movement of the sheet is stopped, or the exposure process is stopped and problems caused by the bending of the sheet (for example, ,
This is to prevent image defects, damage, etc.).

In the above embodiment, a plurality of sheets 3 are stacked and set on the stacker 2 of the main body 1, and the operation panel 6
When the large size mode button 7 prepared for
moves to the set position P on the exposure surface 4. Next, when the number of copies setting button 7b is used to display the number of copies in the display window 7c and the copy button 7d is pressed, the sheets 3 on the stacker 2 are sent out by the delivery roller 8, and are sorted by the sorting means 9 and sent to the entry path. Sent to 10. The sheet that has entered the entrance path 10 advances to the exposure surface 4 at a set speed by the cooperative operation of the roller conveyance means 11 and the belt conveyance means 12 provided on the exposure surface 4.

When the leading edge of the sheet is detected by the first sensor 13 provided near the exit of the conveyance path 10, the timer of the exposure means 5 starts counting, and when the leading edge of the sheet reaches the exposing means 5, exposure starts. let After that, when the first sensor 13 detects the trailing edge of the sheet, the exposure ends (1
(Completion of copying the section). After this exposure, the sheet is sent to the circulation conveyance path 16 by the operation of the belt conveyance means 12 and the discharge roller 14 as it is before the set number of copies has expired, and is returned to the upstream side by the intermediate roller conveyance means 18, 18'. and enters the exposure surface 4 again via the entry path 10. When the first sensor 13 detects the leading edge of the sheet re-entering the exposure surface 4, as described above, the exposure means 5
A timer (not shown) starts counting, and the exposure means 5 exposes (second copy).

After that, if the set number of copies has not been reached, the belt conveying means 12 and the paper ejection roller 1 are moved again.
4, the sheet is fed into the circulation path 16, and when the set number of copies has expired, the sheet is ejected to the paper ejection tray 15 by the action of the switching claw 17. Subsequently, the next sheet stacked on the stacker 2 is sent out. The above operation will be continued until there are no more documents on the stacker 2.

[0015]

As described above, the present invention provides a copying apparatus equipped with a conveyance means for advancing a sheet to an exposure surface, and an exposure means for synchronously exposing the sheet moving on the exposure surface. A circulation conveyance path is provided in which the sheet is taken out from the downstream side of the exposure surface, returned to the upstream side, and then re-entered the exposure surface, which has the excellent effect of making multiple copies in succession while the sheet is repeatedly circulated on the exposure surface. It is something that plays.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional front view of an embodiment of a copying apparatus of the present invention.

FIG. 2 is a schematic plan view showing sheet bending detection means.

[Explanation of symbols] 1 Main body 2　Stacker 3 Large size original (sheet) 5 Exposure means 6 Operation panel 7 Large size mode button 8. Delivery roller 9. Means of handling 10 Approach route 11, 11' Roller conveyance means 12 Belt conveyance means 13 First sensor 14 Paper ejection roller 15 Paper discharge tray 16 Almost closed loop circulation conveyance path 17 Switching claw 18, 18' Roller conveyance means 19 Reversal path 20, 20' Roller conveyance means 21 Sheet bending detection means

Claims (1)

[Claims] 1. A copying apparatus comprising a conveyance means for advancing a sheet to an exposure surface, and an exposure means for synchronously exposing the sheet moving on the exposure surface, wherein the exposed sheet is transported from the downstream side of the exposure surface. A copying apparatus characterized in that a substantially closed-loop circulation conveyance path is provided for taking out a sheet, returning it to the upstream side via the lower part of a sheet stacker, and entering the exposure surface again.