JPS59198243A - Sheet separation conveying device - Google Patents

Abstract

PURPOSE:To make sheets conveyable surely as being separated piece by piece, by keeping both of a conveying endless belt and a separating endless belt in contactingness with proper pressure against these sheets. CONSTITUTION:A driving roller 12 of a conveying endless belt 10 is set up in position short of a driven roller 15 of a separating endless belt 11, while a sheet 16 is fed upward obliquely into a gap between these endless belts 10 and 11 from the downside of the driving roller 12 of the endless belt 10. Conveying endless belts 10a and 10b and separating endless belts 11a, 11b and 11c get somewhat into gaps at opposite sides with each other whereby each sheet 16 fed in space between these belts is separated piece by piece and conveyed in the form of being waved. With this arranement like that, frictional force between the belt and the sheet grows large so that a separating conveyance action is yet more increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet separating and conveying device that separates and conveys a large number of stacked sheets one by one. For example, in a facsimile machine, sheet originals stacked on a document table are separated one by one. The present invention relates to a sheet document separation and conveyance device used to separate and feed sheet documents into an apparatus.

In such a sheet separation and conveyance device, an endless belt for conveyance, which is placed around a driving roller and a driven roller, and an endless belt for separation, which is placed around a driving roller and a driven roller, are arranged to face each other, and both endless belts are mutually connected on their opposing surfaces. A sheet separation and conveyance device has been proposed that moves in the opposite direction to separate and convey sheets that are overlapped between belts.

In such a device, between the frictional force F1 between the conveying endless belt and the sheet, the frictional force F between the separating endless belt and the sheet, and the frictional force F3 between the sheets, Ft
The configuration is such that the relationship >F2 >F3 holds true. On the opposing surfaces of these endless belts, the conveying endless belt is moved in the sheet conveying direction, and the separating endless belt is moved in the opposite direction, that is, in the sheet return direction. If multiple sheets are transferred between these endless belts,
The endless separation belt returns the first sheet in contact with it in the opposite direction to the conveyance direction. Next, the endless belt for separation comes into contact with the second sheet and returns it.
In the same manner, the separating endless belt sequentially returns the sheets that have been transferred in duplicate in the opposite direction to the conveying direction, and eventually
The number of sheets between the endless belt for conveyance and the endless belt for separation is 1.
It becomes one piece. In this situation, the above FB)F,
Because of this relationship, the sheets are conveyed by the endless belt for conveyance, and thus the sheets that have been fed in duplicate between the pair of belts are separated and only one sheet is conveyed.

In the sheet separating and conveying device of the above type, the conveying endless belt and the separating endless belt must maintain contact with the sheet with an appropriate pressure. for that purpose,
It is necessary to arrange the driving roller and driven roller of the endless belt for conveyance and the driving roller and driven roller of the endless separating belt so as to face each other with a narrow interval, but in such an arrangement, it is extremely difficult to When a thick sheet is passed between the belts, or when thick sheets are passed between the belts while they are overlapped, excessive force may be applied and the sheets may be damaged or the device itself may be damaged.

The present invention solves the above-mentioned problems in the sheet separation and conveyance device, and maintains the endless conveyance belt and the separation belt in contact with the sheets with appropriate pressure, thereby reliably separating the sheets. In addition to transporting
To provide a sheet separating and conveying device which prevents the device itself from being destroyed when a sheet is damaged even when thick sheets or thickly stacked sheets are fed between belts.

The sheet separating and conveying device according to the present invention is characterized by moving an endless conveying belt and a separating endless belt by applying them to respective driving rollers and driven rollers, and moving these endless belts in opposite directions on their opposing surfaces. In a sheet separating and conveying device that separates and conveys sheets that are double-fed between belts, opposing surfaces of the pair of endless belts are on slack sides.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a facsimile machine will be described below with reference to the drawings. In Figure 1, 1 is a guide that guides the original sheet, 2 is a pickup roller, and 3 is a guide for guiding the original sheet.
4 is a feeding roller, 5t:l is a discharge roller, 6 is a light source for illumination, 7 is a tray for stacking original sheets, 8 is a recording sheet roll, and 9 is a recording sheet stacking device according to the present invention. Showing tray. During transmission, the original sheet is sent from the guide 1 by the pickup row 22, separated and transported by the original sheet separation and transport bag f3, fed by the feeding roller 4, and placed on the tray 7 by the discharge row 25. be discharged. The original is read and transmitted by a reading device disposed between the feed row 24 and the discharge roller 5. Further, during reception, the recording sheet is fed out from the roll 8 and discharged onto the tray 9, and on the way, recording is performed on the recording sheet by a recording means such as a thermal head. The document reading device and recording device described above may be of a well-known type, so a detailed description thereof will be omitted.

The document sheet separation and conveyance bag ft3 described above represents an embodiment of the present invention, and its details are shown in FIG.

In FIG. 2, reference numeral 10 indicates an endless belt for conveyance, and reference numeral 11 indicates an endless belt for separation. It will be done. These belts 10.11 are arranged to move in mutually opposite directions on their opposite sides and in the rows shown:
The drive row 212 is rotated clockwise, and the drive row 214
is also rotated clockwise, and on the opposing surfaces of belts 1o and 1i, belt 10 moves leftward and belt 11 moves rightward. The original sheet 16 is placed on a table 17, and is fed into the sheet separation and conveyance device 3 by a pickup row 22, where it is separated and conveyed.

As mentioned above, the endless conveying belt 10 and the document sheet 16
The relationship Ft>Ft>Fs exists between the frictional force F1 between the separation belt 11 and the document sheet 16, the frictional force F2 between the sheets 16, and the frictional force F3 between the sheets 16. As a result, the original sheets that have been transferred between the υ' bevels are conveyed while being separated between the belts.

In the sheet separating and conveying device 3 shown in FIG. 2, the driving roller 212 of the upper endless conveying belt 10 is arranged on the original sheet feeding side, and the driving roller 14 of the lower endless separating belt 11 is arranged on the original sheet feeding side. The endless belts are disposed on the delivery side, that is, the opposing surfaces of the pair of endless belts are on the slack side.

Therefore, during operation, the endless belt 10 and the endless belt 1
1 are swollen on opposite sides and act so as to contact the original sheet 16 fed between the belts.

10 drive rollers 12 and endless belt 1
The driven roller 15 of No. 1, the driven roller 13 of the endless belt 10, and the drive row 214 of the endless belt 11 are arranged relatively apart, and there is a gap between the belts on the surface of these rows 2, which is larger than the thickness of the sheet. Even if it exists, Bell) 1
Opposite the 0.11 is the respective drive roller 12.14
It bulges toward the seat side under pressure.1 Maintain contact with the seat with moderate pressure. In addition, the bulging belt contacts the sheet uniformly and acts effectively on the sheet. In this way, the sheets fed between the belts are separated and conveyed by these belts. However, in this sheet separation and conveyance device, the endless conveyance belt and the separation endless belt can be placed relatively apart as described above, so if an extremely thick sheet is fed between the belts, Or, if the sheets are fed between the belts while being thickly overlapped, the belt will only be compressed and no excessive force will be applied to the rollers, which may damage the sheets or destroy the device itself. Things like that can be avoided.

In the illustrated embodiment, the driving roller 12 of the endless conveying belt 10 is arranged in front of the driven roller 15 of the separating endless belt 11, and the sheet 16 is transferred from below the driving roller 12 of the endless belt 10 (the endless belt). It is designed to be fed obliquely upward into the gap between 10 and 11. That is, the sheet 16 first contacts the surface of the endless belt 10 at its leading end and is fed between the belts 10.11 by frictional contact with the surface of the endless belt 10. This arrangement allows the sheet 16 to be fed between the belts without the risk of bending the leading edge of the sheet 16.

In the above-mentioned sheet separation and conveyance device, in order to increase the separation and conveyance efficiency, a plurality of endless conveyance belts and a plurality of separation endless belts are provided, and these belts are arranged so as to intertwine with each other. It can be configured to fit slightly between the endless separation belts. Such an embodiment is shown in FIG. In FIG. 3, lOa, 10
b is an endless belt for conveyance, lla, llb, llc are endless belts for separation, and these endless belts are
Similarly to the embodiment shown in FIG. 2, it is applied to each driving roller and driven roller. In this embodiment, endless conveying belts 10a, 10b and endless separating belt l are used.
On their opposing surfaces, la, llb, and lie are slightly inserted into the gap between the opposing belts, and the sheet 16 fed between these belts is separated and conveyed in a wavy form. Such an arrangement increases the frictional force between the belt and the sheet, further increasing the separating and conveying action.

The embodiment shown in FIG. 2 described above shows a separating and conveying apparatus in which the present invention is applied to a structure in which sheets 16 stacked on a table 17 are conveyed sequentially from above.

Alternatively, the present invention can also be applied to a structure in which stacked sheets are conveyed sequentially from the bottom. FIG. 4 shows an implementation of the present invention for such a structure.

In the embodiment shown in FIG. 4, the endless belt 10 for conveyance and the endless belt 11 for separation are reversed from those shown in FIG.
That is, the endless steel transporting belt 10, which is wound around the driving roller 12 and the driven roller 13, is placed on the lower side, and the endless separation belt 11, which is placed between the driving roller 14 and the driven roller 15, is placed on the upper side. The operation thereof is substantially the same as that shown in FIG. By arranging the belts in such a manner, the belt and the sheet being fed between the belts can be kept in contact with an appropriate pressure, thereby making it possible to apply an appropriate conveying force to the sheet. Since the belt contacts the sheet uniformly, excellent separation and conveyance action can be achieved. In addition, since the rollers of the endless belt for conveyance and the endless belt for separation can be arranged to a certain extent, there is no possibility of damage due to excessive force being applied to the sheet or the device itself when thick sheets or thick sheets are conveyed. This will be prevented from occurring. Additionally, since each belt is configured to swell and come into contact with the sheet, the desired separating and conveying action can be obtained without having to accurately position each belt drive and driven roller. can get. Furthermore, the device of the present invention can be applied to existing devices without requiring any additional mechanism.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an outline of a facsimile machine embodying the present invention, FIG. 2 is a side view showing an embodiment of a sheet separation and conveyance device according to the present invention, and FIG. 3 is a side view showing a modification of the device of the present invention. The cross-sectional view, FIG. 4, is a schematic diagram showing still another modification of the device of the present invention. 10...Endless belt for conveyance 11...Endless belt for separation 12...Drive roller 13...Followed roller 14.
... Drive roller 15 ... Followed roller 16 ... Original sheet Figure 2 Figure 3 Figure 4 U

Claims (1)

[Claims] An endless belt for conveyance and an endless belt for separation are applied to their respective driving rollers and driven rollers, and these endless belts are moved in opposite directions on their opposing surfaces, and the sheets that are double-fed between the belts are separated and conveyed. A sheet separating and conveying device characterized in that opposing surfaces of the pair of endless belts are each on a slack side.