JPS61183051A - Recording paper turn over device - Google Patents

Abstract

PURPOSE:To enable to turn over a recording paper securely in a compact space and in a simple structure, by furnishing a turn over roller with linking grooves formed to bite the rear end of the recording paper and to displace the paper, in a facsimile or the like. CONSTITUTION:A recording paper 7A delivered in the direction of the broken line is held between a turn over roller 14 and the first pressure roller 15, carried in a curve 17b from its forward tip 7Aa, struck by a guide plate 24, and received in a horizontal portion 17c with its pictured surface downward. In this case, a recording paper 7B delivered in a turn round route 17 goes in to link to one of the linking grooves 14a of the turn over roller 14 by a stiffness of itself, and squeezed to the contact portion of the second pressure roller 16 by the turn over roller 14 which rotates in the paper feeding direction a. Then the rear end 7Ba is held between the turn over roller 14 and the second pressure roller 16, and carried out turned over the up side down.

Description

TECHNICAL FIELD The present invention relates to a recording paper reversing device suitable for reversing recording paper, particularly for facsimile machines.

There is a type of conventional facsimile machine in which, on the receiving side, recording sheets are stacked on a paper ejection tray in the reverse order of the pages of the transmitted document. As a countermeasure to this problem, a recording paper reversing device has been proposed that reverses the recording paper from front to back and then discharges the paper and stacks it on a paper ejection tray to match the page order of the original on the sending side.

Although a relatively large facsimile machine has sufficient space to turn the recording paper without a special turning device, in a small facsimile machine, the provision of a turning device is an obstacle to reducing the size of the facsimile machine. Therefore, in the case of a small facsimile machine, the actual situation is that the user is forced to arrange the pages of the received recording paper. In addition to the problem of installation space, the reversing devices that have already been proposed are limited in the size of the paper that can be reversed.
There are structural problems such as the need for means to send out the recording paper once received in the reversing path.

Purpose It is an object of the present invention to provide a recording paper reversing device which has a simple structure and requires a small installation space.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an illustrated embodiment.

In FIG. 1, reference numeral 1 generally indicates a small facsimile machine. The facsimile 1 includes a paper feed mechanism 2 for feeding recording paper 7 one by one, a recording section 3 for recording transmitted signals on the recording paper, and a recording paper with a recorded image formed on one side. A recording paper reversing device 4 for reversing the front and back sides, and a pair of paper discharge rollers 6 for discharging the reversed recording paper onto a paper discharge tray 5 are provided. In addition to the mechanism for recording reception, the facsimile is also equipped with a mechanism for transmission, but these are omitted.

The paper feed mechanism 2 includes a cassette 8 that stores recording paper 7,
Pickup roller 9 that sends out the recording paper in the cassette 8
, a bottom plate push-up lever 10 for lifting the bottom plate loaded with recording paper and pushing the uppermost recording paper to a predetermined position relative to the pickup roller, and a feed roller 11 for further feeding the recording paper sent out by the pickup roller. and a facsimile machine that is in pressure contact with this feed roller and rotates in the opposite direction to the traveling direction of the recording paper, or is stopped and stops the recording paper other than the one sheet of recording paper fed by the feed roller by friction. It consists of a roller 12 and a pair of registration rollers 13 for intermittently feeding the recording paper sent out by the feed roller 11 in synchronization with the recording operation of the recording section 3.

The recording unit 3 forms a recorded image on one side of recording paper by a well-known means.

The reversing device 4 reverses a reversing roller 14 that is rotationally driven in the recording paper feeding direction shown by arrow a, a first pressure roller 15 that comes into contact with the reversing roller and rotates as a result, and a second pressure roller 16. It consists of a recording paper reversing path 17 for receiving recording paper.

The reversing port 14 is made of an elastic material such as rubber, and as shown in FIG. 2, an engagement groove 14a having a serrated cross section along the generatrix direction is formed on its peripheral surface. This reversing roller 14 is as shown in FIG.

A plurality of cylinders are spaced apart from each other on the drive shaft 18.

As shown in FIG. 3, a plurality of first pressure rollers 15 are fixed to a support shaft 19 and are made of metal, for example, with a knurled peripheral surface. This roller 15 is
It is brought into contact with the circumferential surface of the reversing roller 14 by a spring 20, and as shown in FIG.
It is in contact with the circumferential surface at a position away from the axial center of No. 4.

The support shaft 19 is supported at both ends by side plates (not shown) so as to be rotatable and movable towards and away from the reversing roller. The first pressure roller 15 cooperates with the reversing roller 14 to convey the recording paper in the first direction indicated by the arrow. When the reversing roller 14 is made of metal or hard synthetic resin, the first pressure roller 15 is made of an elastic body such as rubber.

The second pressure roller 16 is disposed at a downstream position in the rotational direction of the reversing roller 14 at a distance from the first pressure roller 15, and comes into contact with the circumferential surface of the reversing roller 14 to rotate as a result. The second pressure roller 16 is made of an elastic body such as rubber or metal, and is fixed to the support shaft 21 at a distance.

Further, as shown in FIG. 3, the second pressure roller 16 is in contact with the circumferential surface of the reversing roller 14 at a position shifted from the first pressure roller 15 in the axial direction. The support shaft 21 is supported at both ends by side plates (not shown) so as to be rotatable and movable toward and away from the reversing roller 14, and is supported by a spring 22 (see FIG. 4) to reverse the second pressure roller 16. It is urged in a direction to bring it into contact with the roller 14. Second pressure roller 16
The recording paper fed into a recording paper reversing path, which will be described later, is conveyed in a second direction indicated by an arrow C in cooperation with a reversing roller, with the trailing side edge leading.

The recording paper reversing path 17 is connected to the first
．． A curved portion 17b with its lower opening 17a facing between the second pressure rollers 15 and 16, and a horizontal portion 17c communicating with the curved portion and extending substantially horizontally along the upper portion of the facsimile 1. It consists of

The curved portion 17b is composed of a pair of guide plates 23 and 24, and gradually becomes wider as it approaches the circumferential surface of the reversing roller 14. A reversing roller 14, a first . 2nd pressure roller 15.16
A part of each circumferential surface is facing. The horizontal portion 17C is constituted by mutually parallel guide plates 25,26. A plurality of protrusions (not shown) are formed on the mutually opposing surfaces of each of the guide plates 23, 24, 25, and 26 along the traveling direction of the recording paper in order to reduce conveyance resistance of the recording paper. .

As will be described later, in the reversing path 17, there are times when the recording paper that is reversed and sent out from the reversing path 17 and the recording paper that is fed into the reversing path coexist. The first. The second pressure rollers 15,16 are arranged apart from each other.

Further, the curvature of the curved portion 17b is set in accordance with the thickness and stiffness of the most frequently used recording paper. Furthermore, the deeper the engagement groove 14a of the reversing roller, the deeper the engagement with the trailing edge of the paper, which is effective in displacing the trailing edge of one sheet to follow the reversing roller 14; The optimum depth is selected in consideration of the contact pressure with the roller and the hardness of the material of the roller.

The operation of the embodiment configured as above will be explained. In this case, the sending side shall send the pages in descending order of size. In other words, on the receiving side, recording operations are performed in ascending order of pages.

In FIG. 1, upon receiving a reception signal, a control device (not shown) operates the paper feed mechanism 2 to feed a sheet of recording paper toward the recording section 3. In the recording section 3, one side of the recording paper is Record an image on the surface. In this embodiment, in the recording section 3, an image is formed on the upper surface of the recording paper.

The recording paper on which the recorded image has been formed is as shown in FIG.
It is sent towards the reversing device W4.

In FIG. 4, recording paper 7A has been conveyed in the direction of the broken line.
is held between the reversing roller 14 and the first pressure roller 15, and fed into the curved portion 17b from its leading edge 7Aa. The leading edge of the recording paper fed into the curved portion 17b in the first direction collides with the guide plate 24, and then
It is curved along this and fed into the horizontal portion 17c. The recording paper located in the horizontal portion 17c is accepted with the image side facing down. The portion of the recording paper 7B fed into the reversing path 17 located in the curved portion 17b has a curved surface, so that the paper is forcibly curved.
A moving habit occurs due to the rigidity of the white body of the paper, that is, the stiffness of the paper in the direction toward the second pressure roller 16.

When the trailing edge 7Ba of the recording paper 7B separates from the contact portion between the reversing roller 14 and the first pressure roller 15, this trailing edge 7Ba, due to its habit, snaps into one of the engagement grooves 14a of the reversing roller 14. enter and engage with it.

The trailing edge that has engaged with the engagement groove 14a is moved by the reversing roller 14 rotating in the paper feed direction a, as shown by the chain line.
It is pushed toward the contact portion with the second pressure roller 16. A force that tries to move the entire recording paper in the first direction is applied to the recording paper 7B whose leading edge is pushed.
The recording paper 7B, which collides with the guide plate 24 and is forced to curve, is subjected to frictional resistance that resists this force. Therefore, only the rear end portion of the recording paper 7B, which is located in the wide portion of the curved portion 17b, is curved and reversed as shown by the chain line. Then, the trailing edge 7Ba of the recording paper 7B pushed by the engagement groove 14a is moved by the reversing roller 14 as shown in FIG.
and held between the second pressure roller 16.

It begins to be sent in the second direction C. In other words, when the trailing edge of the recording sheet fed into the reversing path 17 from its leading edge leaves the contact area between the reversing roller 14 and the first pressure roller 15, the trailing edge is moved to the second position by the engagement groove 14a. The rear end edge 7B is displaced toward the pressure roller 16 and held between the roller 16 and the reversing roller 14.
It will be conveyed in the second direction with a as the leading edge. In other words, the recording paper fed into the recording paper reversing path 17 is reversed in a switchback manner and is discharged with the recording image side facing down.

In FIG. 4, the leading edge 7Ca of the next recording paper 7C follows the trailing edge 7Ba of the preceding recording paper 7B without leaving a large gap. As shown in FIG. 5, when the recording paper 7C enters the curved portion 17b, the recording paper 7C
The preceding recording paper 7B that is being conveyed is fed into the reversing path along one surface. This recording paper 7C, like the preceding recording paper 7B, is reversed in a switchback manner, and then
The recording paper 7B is discharged and stacked on the paper discharge tray 5 with its recording surface facing down.

By repeating the above-described operations, the recording sheets are stacked on the paper discharge tray 5 in pages according to the transmission order of the transmitting side, with each recording image side facing down. Therefore, when the stack of recording papers on the paper discharge tray 5 is turned over after the receiving operation is completed, a stack of recording papers arranged in pages from the top is obtained.

In addition, as for the engagement groove formed in the reversing roller.

The engaging groove 14Aa is not limited to the sawtooth shape shown in FIG. 2, but may be a triangular tooth shape as in the reversing roller 14A shown in FIG.

Effects of the Invention As described above, according to the present invention, which has a reversing roller formed with an engagement groove that engages and displaces the trailing edge of the recording paper, the paper can be moved in a small space and with an extremely simple structure. can be inverted.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an example of a facsimile to which an embodiment of the recording paper reversing device of the present invention is applied. FIG. 2 is a side view showing an example of the reversing roller, and FIG. 3 is a side view showing an example of the reversing roller. FIGS. 4 and 5 are plan views showing the relative positions of the second pressure rollers, FIGS. 4 and 5 are side views showing the action of the reversing device, and FIG. 6 is a side view showing only the essential parts of another example of the reversing roller. 7... Recording paper, 7Aa... Leading edge, 7Ba...
Rear end edge, 14... Reversing roller, 14a... Engagement groove,
15...First pressure roller, 16...Second pressure roller, lF...Recording paper reversing path, a...Recording paper feeding direction, b...First direction, C... Second direction.

Claims (1)

[Scope of Claims] A recording paper reversing device for reversing a recording paper with a recorded image formed on one side in a switchback manner, the device being rotatably driven in the feeding direction of the recording paper, A reversing roller is formed on its circumferential surface with an engagement groove in the generatrix direction, into which the trailing edge enters and engages. a first pressure roller for conveying the recorded paper in a first direction from its leading edge in cooperation with the reversing roller; an opening thereof facing the upper circumferential surface of the reversing roller; a recording paper reversing path that receives the recording paper conveyed by the reversing roller and the first pressure roller from its leading edge in a first direction; a second rotating roller that rotates and cooperates with the reversing roller to pull out the recording paper received in the recording paper reversing path from its rear edge and transport it in a second direction opposite to the first direction; The trailing edge of the recording paper sent into the recording paper reversing path by the first pressure roller and the reversing roller is engaged with the engagement groove, and the trailing edge is applied with a second pressure roller. A recording paper reversing device characterized by displacing recording paper toward a roller.