JPS60137759A - Paper sheet transport apparatus - Google Patents

Abstract

PURPOSE:To easily feed a paper sheet transported through the first transport path into the second transport path in such a manner that the trailing end of the paper sheet takes the position of the leading end in the transport direction by providing guide means between the first transport means and the second transport means. CONSTITUTION:After the lapse of designated time, that is, the time enough to pass the trailing end of a transfer sheet P through a guide plate 23 forming the terminal portion of the first transport path 20 since the trailing end of the transfer sheet P is detected by transfer sheet detecting means, rollers 29a, 29b as the second transport means 29 are turned reversely in direction of a broken-line arrow. At this time, the trailing end of the transfer sheet P is positioned off the end portion of the guide plate 23, and the transfer sheet P which has been transported in a warped state is put into a state parallel to the guide surface 35a of the second guide 35 by its restoring force, so that the trailing end is pointed to the second transport path 210. Subsequently, by the reverse operation of the transport rollers 29a, 29b, the transfer sheet P is fed into the second transport path 210 along the third guide 36 and the second guide 35.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applied to, for example, a double-sided copying device,
Paper sheet 9 such as transfer paper conveyed by the first conveyance path
The present invention relates to an improvement in a conveying device for paper sheets, in which paper sheets are fed into a second conveyance path so that the trailing end thereof becomes the front end in the conveyance direction.

[Technical background of the invention and its problems]

In recent years, various types of automatic double-sided copying apparatuses have been developed and put into practical use.

Usually, in this type of copying apparatus, a transfer device called a transfer paper switchback device, in which a copy image is formed on one side of the paper by passing through an image transfer section! '! After the mounting member is returned to a state where the rear end becomes the leading edge in the transport direction through the r, the mounting is reversed via a U-shaped transport path, etc., and the mounting is sent to the image forming section again to perform double-sided copying.

However, in the past, paper sheets such as transfer paper that have been conveyed through the first conveyance path are fed into the second conveyance path so that the rear end thereof becomes the leading edge in the conveyance direction.
In a sheet conveying device called a so-called switchback device, the end of a single sheet is passed through a sorting gate to a second
It is designed to guide the robot to the conveyance path side. therefore,
It is necessary to provide a dart driving means for driving the sorting dart and the sorting gate at a predetermined timing in a narrow portion, which causes problems such as lower assembly efficiency and reliability against failure, and higher cost.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its purpose is to transfer paper sheets conveyed through the first conveyance path without using movable members such as sorting darts or drive means. It is an object of the present invention to provide a conveyance device for paper sheets that can be fed into a second conveyance path so that the end thereof becomes the leading edge in the conveyance direction.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention includes a first conveyance means provided at the terminal end of a first conveyance path, and a first conveyance means provided downstream in the direction in which paper sheets are conveyed by the first conveyance means. A straight line passing through each of these conveying sections between the second conveying means!
7. A guide means having a guide portion protruding toward the extension line side of the second conveyance path is provided, and the paper sheet being conveyed by the first conveyance means is given a reverse 9 to move the rear end of the sheet. When the paper leaves the first conveyance means, its restoring force guides the rear end toward the second conveyance path.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows an automatic double-sided copying apparatus to which the conveyance device of the present invention is applied. In the figure, 1 is a main body of the machine, and a drum-shaped photoreceptor 2 is provided in the main body 1 of the machine.

A charging device 3, an imaging section 4h of an exposure device 4, a developing device 5, a transfer device 6, a peeling device 7, a cleaning device 8, and an afterimage erasing device 9 are arranged in this order around the photoreceptor 2. ing.

Further, an exposure optical system 13 including an exposure lamp 1θ, a plurality of mirrors 11 . The original image set on the original platen 14 is subjected to slit exposure onto the photoreceptor 2.

Further, a paper feed cassette 15 is attached to the left side of the main body 1 of the apparatus, and the transfer sheets P in the paper feed cassette 15 are sequentially taken out via a paper feed roller 16fc and transferred to a pair of aligning rollers 17a and 17b. The image is supplied to an image transfer section 18 between the photoreceptor 2 and the transfer device 6 via a conveyance mechanism 17 .

Further, inside the apparatus main body 1, there is a first conveyance path 20 for conveying the transfer paper P that has been fed into the image transfer section 18 and then peeled off by the peeling device 7 to the fixing device 19; The aligning roller pair 17a is provided along the lower surface side of the path 20 to guide the transfer paper P that has passed through the fixing device 19 to the image transfer section 18 again as necessary.

A second conveyance path 21 is provided in front of 17b.

The first conveyance path 20 is formed by the upper surface of the conveyor belt 22, the rolling contact portion of the fixing roller pair 19a, 19b of the fixing device 19, the upper surface of the side plate 22, 23, etc. 2 is the upper surface of the conveyor belt 22 and the first belt curved in a U-shape. It is constituted by mutually opposing surfaces of the second guide plates 24, 25, etc.

Further, a conveyance device # (switchback device) 26 of the present invention is incorporated in the right side of the apparatus main body 1, and conveys the transfer paper P-i sent out from the first conveyance path 20 as it is to the apparatus main body 1. 9 discharged onto the paper ejection tray 27 attached to the right side of the paper, or the paper can be sent to the second conveyance path 21 with its rear end when conveyed by the first conveyance path 20 being the leading edge in the conveyance direction. It has become.

That is, the conveyance device 26 is driven as shown in detail in Figure 2.
A pair of conveying rollers 28a provided at the terminal end of the conveying path 20 of
. A pair of conveying rollers 29 that convey in the same direction and, if necessary, convey in reverse so that the trailing edge of the transfer paper P is at a position away from the first conveying means 28, either on the trailing edge side or on the leading edge in the conveying direction.
A second conveying means 29 consisting of a and 29b is provided. Further, between the second conveying means 29 and the first conveying means 28, there are conveying force transmitting sections 30.
It has a protruding guide portion 32 that protrudes by a dimension t from the straight line L1 passing through the row 2 rolling contact portion as ゜31 to the extension line L2 side of the second conveyance path 21, and is reversely conveyed by the first conveyance means 20. When the rear end of the transfer paper P is separated from the first conveyance means 28 and there is no obstacle, its restoring force causes the rear end to move to the second conveyance path 21. Guide means 33 are provided for guiding towards the side.

This guide means 33 is provided between the first conveyance means 28 and the second conveyance means 29, and has a protruding guide portion 32 in the middle.
a dogleg-shaped first guide 34 having a bent portion;
A dogleg-shaped second guide 35 is provided between the conveyance means 29 of the section 2 and the starting end of the second conveyance path 2 so as to partially follow this first guide 34; Second guide 35
The configuration includes a third guide 36 provided between the starting end of the second conveyance path 21 and the first conveyance means 28 so as to partially follow the . A substantially horizontal Y-shaped transfer paper guide path 37 is formed between these mutually facing surfaces.

The reference numeral 40 shown in FIG. 2 is a detection lever that is rotated and deflected as the transfer paper P passes, and constitutes a transfer paper detection means 41 together with a detector (not shown).

Note that 43 shown in Figure 1 is a manual paper feed path, and a pair of feed rollers 44h and 44b are arranged.

Next, the operating state of the above embodiment will be explained.

First, the case of one-sided copying will be explained. As the photoreceptor 2 rotates in the direction of the arrow, it is uniformly charged by the charging device 3, and then uniformly irradiated by the exposure lamp 1°; It is exposed to light and an electrostatic latent image is formed. The electrostatic latent image thus formed is developed by facing the developing device 5, and then the developed image (developer image) is sent to the transfer device 6 side.

On the other hand, at this time, transfer paper P is automatically fed from the paper cassette 15 or manually fed through the manual paper feed path 43.
The aligning roller pair 17m and 17b are pressed against each other in advance, and in synchronization with the timing of forming a 1flif image on the photoreceptor 2, the aligning roller pair 17 is pressed against the aligning roller pair 17m and 17b.
m, 17 b starts rotating, and the transfer paper P transfers the image s1
It is sent to 8th.

After the developer image on the photoreceptor 2 is transferred onto the upper surface of the transfer paper P by the action of the transfer device 6, the transfer paper P is peeled off from the photoreceptor 2 by the peeling device 7 and transferred to the first conveyance path. Sent to 20. A fixing roller 19a of the fixing device 19,
The developer image is fixed by passing through the entire distance 19b.

Next, this transfer paper P is delivered to the second conveyance means 29 provided on the downstream side in the conveyance direction via the first conveyance means 28f, conveyed in the same direction, and guided to the image transfer section 18 again. The paper is ejected onto the paper ejection tray 27 as is.

In addition, during double-sided copying, the conveyance is temporarily stopped before the trailing edge of the transfer paper P completely passes through the second conveyance means 29, and then the second conveyance means 29 performs a reverse conveyance operation, that is, the pair of conveyance rollers 2
9h and 29b are rotated in the direction of the broken line arrow, and the transfer paper P is fed into the second conveyance path 21 so that its rear end becomes the leading edge in the conveyance direction. Then, this transfer paper P is transferred to the second conveyance path 2.
By passing through the horizontal U-shaped conveyance section at the terminal end of
8, and the developer image is transferred. At this time,
A portion of the leading edge of the transfer paper P on which one-sided copying has been performed is exposed to the outside from the pair of rollers 29a and 29b, so that the copying state can be checked. Furthermore, with respect to the length of the transfer paper P, is the distance between the roller pair 28a, 28b and the roller pair 29a, 29b? It can be made smaller, and the device can be made smaller.

The transfer paper P on which both sides have been copied in this manner is peeled off and sent to the fixing device 19, where the unfixed image is fixed, as described above, and then discharged onto the paper discharge tray 27.

Next, the transfer paper Pf that has been reversely conveyed through the first conveyance path 20 will be described in detail regarding the operations when ejecting it to the output tray 27 and when feeding it into the second conveyance path 21 for double-sided copying. . First, the transfer paper P that has passed through the pair of fixing rollers 19* and 19b travels straight on a guide plate 23 that forms the terminal end of the first conveyance path 20, and the transfer paper P passes through the pair of fixing rollers 19* and 19b.
A conveying roller 28a serves as a conveying means 28.

28b, and these conveying rollers 28&.

It is further conveyed with the rotation of 28b.

On the other hand, the detection lever 40 of the transfer paper detection means 41 detects the transfer paper P.
As the leading edge of the transfer paper P passes, it is pushed out of the conveyance path 20, and the passing of the leading edge of the transfer paper P is detected.

The leading edge of the transfer gp conveyed by the conveyance rollers 2111L and 211b comes into contact with the guide surface 74a of the first guide 34 located in a state intersecting the conveyance direction,
Proceed diagonally downward along the guide surface 34h, and then,
The guide surface of the second guide 35? 5a, it advances obliquely along the guide surface 35al and becomes warped, and its leading edge has previously rotated in the direction of the solid line arrow in response to the leading edge detection signal from the transfer paper detecting means 41. Conveyance rollers 29m and 29b as second conveyance means 29
Get in between. At this time, the rear end of the transfer paper P is still in the first position.
It is in a state of being reversely transported by the transporting means 28 of.

Next, the trailing edge of the transfer paper P is detected by the transfer paper detection means 41, and for a predetermined period of time, that is, the end of one side of the transfer paper P is detected by π1.
When sufficient time has elapsed for the paper to pass through the guide plate 23 forming the terminal end of the conveyance path 20, the conveyance rollers 291L and 29b serving as the second conveyance means 29 reversely rotate in the direction of the broken line arrow.

At this time, the rear end of the transfer paper P is moved away from the edge of the guide plate 23, and the transfer paper P, which had been conveyed in a warped state as shown by θ) in FIG. As shown in (b) in the figure, due to the restoring force, the guide 35 of section 2 is in a state along the guide surface 35m, and its rear end is oriented toward the conveyance path 21 side of section 2. There is.

In this state, the transfer paper P is transferred to the third
One is the guide surface 36h of the id 36, and the second is the id 35.
It is sent into the second conveyance path 21 along the guide surface 35b.

In the above-mentioned embodiment, the transfer paper P'5/, which is conveyed by the first conveyance path 20 in order to make copies on both sides of the transfer paper P:
However, in the configuration shown in FIGS. 3 and 4, the transfer paper P fed from the first conveyance path 20 is fed into the first conveyance path 21 without changing its leading edge in the conveyance direction. It is also possible to add an inox means 50 that allows the images to be fed directly into the second conveyance path 21, thereby making it possible to overlap and copy images on the same surface. That is, the second conveying means 2
The second branch branches off from the guideway section 37m located on the near side of No.9.
It reaches the starting point of the conveyance path 21, and the conveyance a-
A bypass path 52 arranged in pairs 51g and 51b is formed between guide plates 53 and 54, and a guide path portion 37h.
A gate 55 is provided which selectively opens and closes the input path 52 and also serves as an input plate. This dart 55 is swingable about a support shaft 56 and is always held at the solid line position by a spring (not shown), that is, the guide path portion 3 that moves toward the second conveying means 29.
7a' (i7 is opened and biased to the position where the bypass path 52 is closed. Also, this gate 55 is moved to the position indicated by the chain double-dashed line via the r-) drive means 57, that is, the second conveying means 29 The guide path section 37af leading to the bypass path 52 is closed.
It is configured so that it can be moved to a position where it is released. The dart driving means 57 has an a-ra 58 at one end and a lever 6o pivotally supported at its midpoint via a support shaft 59, and the other end of this lever 6θ is connected to a plunger type solenoid 61.
By pulling it, the sillper 60 is displaced and the sill dart 55 is pushed up against the biasing force of the spring.

In the case of one-sided copying, the r-tooth 55 is kept at the solid line position, and the transfer paper that has passed through the fixing device 19 is
The paper is delivered to the conveyance means 29 of K[2, and the paper is delivered to the paper output tray 2.
It will be discharged on 7th. In the case of double-sided copying, similarly to single-sided copying, it is transferred to the second conveying means 29 and once conveyed in the same direction, and then the conveying direction is reversed, and as described above, the rear end is set as the front end in the conveying direction and the second It is then fed into the conveyance path 21.

Further, when copying images are superimposed on the same surface (for example, when performing two-color power 2-copying), the dart drive means 57 is operated by the leading edge detection signal of the transfer paper P by the transfer paper detection means 41, and the dart 55 is It is displaced to the position shown by the dotted chain line, and the leading edge of the transfer paper P is guided to the bypass path 52 side and sent into the second conveyance path 2 without being switch packed.

Then, an image is formed again on the surface on which the image was once transferred and fixed.

In addition, the second one in double-sided copying and double-sided copying
The forward and reverse transport operations of the transport means 29 and the r-t drive means 5
Switching between on and off operations of 7 is controlled by a designation signal from an operation section (not shown) that designates each of them.

In the above-mentioned embodiment, the paper sheet conveying device of the present invention is applied to a double-sided copying type copying device, but the present invention is not limited to this, and for example, it can be applied to a case where a paper sheet conveying device of the present invention is applied to a double-sided copying type copying device. You may also explain what conveys paper sheets.

In addition, the first conveying means 28 provided at the terminal end of the conveying path 20 of 4E1 and the second conveying means 29 provided on the downstream side in the conveying direction of paper sheets by this first conveying means are respectively conveyed by conveying rollers. vs. 2! la, 28b and 29a,
29b, other conveying means such as a pair of belts may be used.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the invention.

In the description of the other embodiments (FIGS. 3 and 4), the same parts as those of the embodiment described above are given the same reference numerals and detailed explanations will be omitted.

〔Effect of the invention〕

As explained above, the present invention provides a first conveyance means provided at the end of the first conveyance path, and a second conveyance means provided downstream in the direction in which paper sheets are conveyed by the first conveyance means. A guide means is provided between the conveying means and the filter paper which is reversely conveyed by the first conveying means and has an id portion that protrudes from a straight line passing through each of these conveying sections to the extension line side of the second conveying path. When the trailing edge of the paper sheet leaves the first conveyance means by giving the leaf a curl, its restoring force guides the trailing edge toward the second conveyance path. It is. Therefore, without using a movable member such as a sorting dart as in the past, the paper sheets conveyed through the first conveyance path are fed into the second conveyance path so that the rear end becomes the leading edge in the conveyance direction. This has the effect of providing a paper sheet conveying device that is easier to assemble, has improved reliability against failure, and is lower in cost than conventional devices.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a double-sided copying apparatus to which one embodiment of the present invention is applied, Figure 2 is a partially enlarged view of Figure 1, and Figure 3 is a diagram to which another embodiment of the present invention is applied. FIG. 4 is a partially enlarged view of FIG. 3. P... counterfeit abrasive leaf, 20... first conveyance path, 2nd...
2nd conveyance path, 26... conveyance device, 28... first conveyance means, 29... conveyance means of vehicle 2, so, 31...
- Conveyance force transmission section, 32... Protrusion guide section, 33...
Guide means, 34-36... Guide plate, 37... Guide path. Applicant's agent: Patent Attorney Takehiko Hiko Showa Month, Day, 1. Indication of the case Japanese Patent Application No. 58-246373 2, Name of the Invention] N Paper sheet conveyance system - 1 3. Person making the amendment Relationship to the case Patent applicant (307) Toshiba Corporation 4, Agent Name changed on April 2, 1981 (-Okina 5, voluntary amendment 7, contents of amendment (1) Specification, 7th negative line 1st line "21" changed to 12I
O” and correct it. (2) Similarly, in line 783, replace “122” with 12.
1” is corrected. (3) Similarly, in the 7th mill, line 6 LI, correct the ``27 J'' to 1210. 41 Similarly, 7th negative 7th line 122" is 122
0” and corrected. (5) Similarly, the 51st [21] from the bottom of 7n is WTiE'd as 1210'. (6) Similarly, press ``1210'' instead of ``8th station 121st street 12no.'' (7) Similarly, change 8th negative 14th line [20'' to ``].
28” is corrected. (8) Similarly, on page 8, line 17, replace “21” with “2.”
10,” he corrected. (9) Similarly, “21” in lines 5 and 7 of page 9 is corrected to “210J.” (1 [Same as 1] “21” in lines 14 and 16 of page 1
1" should be corrected to 12xo". OD Similarly, in the 12th line of the 12th car, replace the word ``2 no'' with 1.
210,” he corrected. 07J Similarly, 14th Tei lines 9, 15, and 2
In the 0th line, "21" is changed to "1210" and J1 is stopped. (Toward 131, line 1504 - and line 8 "21"
The text has been corrected to "210". Oa Similarly, 11 le I 6jj 3 rows from the bottom 1-412
'7 J is corrected to '210'. (lω Similarly, the 17th line 5th line 121" is f
210,” he corrected. abl same 1; <, page 19, line 17 [, l'l r2J
J Correct Toal's to "210". (Figure 1 of Drawing 19 is corrected as shown in the attached sheet.
01 and "220" respectively. Procedural amendments Showa 5 @, completed 7.4 Japan Patent Office Commissioner Manabu Shiga 1, Indication of the case Japanese Patent Application No. 58-246373 2, Name of the invention Paper sheet conveying device 3, Person making the amendment Case and Relationship between patent application 1g IJ 1 person (3 (J7) Toshiba Corporation 4, agent 5, voluntary amendment 7, contents of amendment (1) Specification, page 5, line 4
Corrected to ``Each means of transportation.'' (2) Similarly, in the 2nd and 3rd lines of the 6th Sada, ``Mirror II mountain'' is corrected to Z ``Mirror 1 no''. (3) Similarly, in the 13th line of the 10th Tei, the word ``period'' is corrected to ``samurai.''

Claims (4)

[Claims] (1) A paper sheet conveyance device that feeds paper sheets conveyed by a first conveyance path into a second conveyance path so that the trailing end thereof becomes the leading edge in the conveyance direction, the first conveyance A first conveyance means provided at the end of the path, and a downstream side of the conveyance direction of paper sheets by the first conveyance means to receive paper sheets conveyed by the first conveyance means. a second conveyance means that conveys the paper sheet in the same direction and reversely conveys the sheet so that the rear end side of the paper sheet becomes the leading edge in the conveyance direction at a position where the rear end of the sheet is separated from the first conveyance means; A guide portion is provided between the second conveyance means and the first conveyance means, which protrudes from a straight line passing through the contact portion between each of these conveyance means and the paper sheet to the extension line side of the second conveyance path. After the paper sheets being conveyed by the first conveying means are given a curl and the trailing edge of the sheet leaves the first conveying means, the restoring force causes the trailing edge to be A conveying device for paper sheets, characterized by comprising a guide means for guiding toward the second conveyance path side. (2) The paper sheet conveyance device according to claim 1, wherein the first conveyance means and the second conveyance means are each constituted by a pair of conveyance rollers that roll into contact with each other. (3) The guide means includes a first guide that is provided between the first conveyance means and the second conveyance means and has a bent part that becomes a protruding guide part in the middle, and this first guide. A second guide provided between the second conveyance means and the starting end of the second conveyance path so as to partially follow the second guide, and a second guide provided partly along the second guide and the first guide. The conveyance of paper sheets according to claim 1, characterized in that the third door is provided between the starting end of the second conveyance path and the first conveyance means. Device. (4) First. Second. 4. The paper sheet conveying device according to claim 3, wherein the filter paper sheet guide path formed by the mutually opposing surfaces of the third guide is approximately Y-shaped.