JPS6246827A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To miniaturize a device as well as to prevent any skew from occurring, by attaching a separate roller and a feed roller to one shaft, driving them separately, and constituting the separate roller after sheet separation so as to be rotated at will, in case of the paper conveying device for a facsimile or the like. CONSTITUTION:When a driving source 13 is rotated in a dotted line direction and a shaft 6 is rotated as well, a feed roller 5a rotates via a one-way clutch 17a and gears 16a, 21a and 23a and another feed roller 5b rotates via a one-way clutch 17b and gears 16b, 21b and 23b as well as a feed roller 4 rotates via a one-way clutch 19 and gears 18, 23 and 25, respectively. And, when the sheet tip end separated by the separate roller 4 is detected by a sensor (unillustrated herein), the driving source 13 is reversely rotated. At this time, these feed rollers 5a and 5b are rotated for conveyance by these one-way clutches 24a and 24b, but the separate roller 4 rotates freely. With this constitution, a device is miniaturized and any skew is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an apparatus for selectively supplying sheet-like paper such as a manuscript, and particularly to a sheet supply apparatus suitable for devices such as facsimile machines.

[Prior art]

Conventionally, in facsimiles, etc., a sheet separation (selection) mechanism and a sheet separation mechanism are used to select a document (hereinafter referred to as a "sheet") containing information to be transmitted and automatically feed this sheet to a reading section. An automatic sheet feeding device consisting of a conveying mechanism is used.

FIG. 4 shows an example of the configuration of an automatic sheet feeding device. In the figure, the sheets S in the sheet stacking section 40 are separated by a feed roller 32 that rotates in the sheet feeding direction A, and a separation roller 33 that contacts this roller 32 and rotates in the opposite direction to the feeding direction of the sheet S. This action selects and feeds the lowest sheet among the stacked sheets. The document is then discharged via a feed roller 34.34A and a discharge roller 35.35A, during which time its contents are read by a reading means comprising an illumination lamp 36 and a photoelectric conversion element 37 in the document inspection section 31.

In the above-mentioned apparatus, since the separating roller and the feeding roller are arranged separately from the sea 1 to the feeding direction, there is a problem that the entire apparatus becomes large-sized.

Figure 5 shows what was proposed in response to this problem (Unexamined Japanese Patent Publication No.
-117866). The device has a paper feed roller (separation roller) 41 and a platen roller (conveyance roller) 42 arranged on both sides of a single shaft 43, gears 50 and 51 rotated by a drive device 48, and a paper feed roller. and gears 71 and 72 on the platen roller side to rotate each of the paper feed roller and the platen roller. At this time, gears 51 and 72 are set so that the rotation speed of the paper feed roller 41 is lower than the rotation speed of the platen roller 42.
, and a combination of 50 and 71. In this state, among the sheets on the mounting table, the lowest sheet is selected by the engagement between the paper feed roller 41 and the pad 46. Next, the sheet is conveyed at a speed dependent on the platen roller 42 mainly due to the thick friction force with the platen roller 42. As described above, in this configuration, both the sheet iH selection roller and the sheet 1 feeding roller are attached to the same shaft, which is very effective in downsizing the entire apparatus.

However, in this device, driving force is constantly transmitted to both the platen roller and the paper feed roller, and the rotation speed of the platen roller is set to be higher than the rotation speed of the paper feed roller. If the sheet selection and the sheet pick-up by the platen roller occur at the same time or if the platen roller picks up the sheet faster, the platen roller rotates faster and the sheet is pulled toward the platen roller 42. diagonal (
skew) (1), and this condition becomes more and more aggravated as sheet feeding progresses.

As a result, it becomes impossible to accurately read the sheet, and the apparatus stops.

〔the purpose〕

The present invention is designed to eliminate the above problems, and by attaching the sheet selecting roller and the feeding roller to the same axis, the entire apparatus can be made smaller, and the sheet can be prevented from skewing. An object of the present invention is to provide a sheet conveying device that prevents the above.

〔composition〕

In FIGS. 1 and 2, reference numeral 4 indicates a separation roller, and reference numerals 5a and δb indicate conveyance rollers disposed on both sides of the separation roller 4, and these rollers are each attached to a single shaft 6. However, since a one-way clutch is attached to this shaft 6 as described later, the transmission of rotational force to each roller is controlled.

Reference numeral 13 denotes a drive source capable of forward and reverse rotation; 14 is a gear attached to this drive source 13; 15 is another gear attached to the shaft 6 and engaged with the gear 14; 17a, 17b, and 18 are attached to this shaft. This is a one-way clutch attached to the vehicle. 16
Gears a and 16b are attached to clutches 17a and 17b, respectively, and 18 is a gear attached to clutch 19. Further, 23a and 23b are gears attached to the conveyance rollers 5a and 5b, and 25 is a separation roller 4.
The gears 21a and 21b are attached to gears 16a and 32.
The gear 20 interposed between the gears L6b and 32b and between the gears L6b and 32b is the shaft of these gears 21a and 21b. Further, 23 is a gear interposed and engaged between gears 18 and 25, and 22 is a rotating shaft of this gear 23. Furthermore, symbols 24a and 24b indicate the one-way clutches 17a and 17b.
, 19 is a one-way clutch configured to transmit rotational force in the opposite direction of rotation. The gear 25 and the separation roller 4 themselves are configured to rotate freely with respect to the shaft 6.

In this device, the drive source 13 first rotates in the direction shown by the dotted line in FIG. This rotation is transmitted to the shaft 6 via gears 14,15. Each one-way clutch 17a, 17b,
19 is configured to transmit rotational force in the rotational direction of the arrow indicated by this dotted line, so this rotational force is transmitted to the conveyance roller 5a via the one-way clutch 17a and the gears 16a, 21a, and 23a, and also to the one-way clutch 19. 17b, gear 1
6b, 21b, 23b to the conveying roller 5b, and via the one-way clutch 19 and gears 18, 23, 25 to the separation roller 4, and each roller 4.5a, 5b receives the driving force of the drive 'tj13. Rotates due to Of these, the separation rubber 3 is in pressure contact with the separation roller 4, and the engagement between the two causes the separation
1. Separate and select the lowermost sheet of the sheet 2 placed on the sheet 2 and convey it. As a result, when the leading edge of the sheet is detected by a sensor (not shown), the drive source 13 is reversed in the direction of the solid line. The shaft 6 also rotates in the solid line direction via the gear 15, but at this time, each one-way clutch 17a, 17b, 19 does not transmit rotational force in the solid line direction. However, since another one-way clutch 24a, 24b is attached to the conveyance rollers 5a, 5b to transmit rotational force in the direction of rotation indicated by the solid line arrow, the rotational force in the direction of the solid line is also applied to the conveyance rollers 5a, 5b. 5b is transmitted to effectively feed the sheet. On the other hand, since such a one-way clutch is not attached to the separation roller 4 side, it rotates freely with respect to the shaft 6. Therefore, the separation roller 4 is the transport roller 5a.
, 5b, and rotates as the sheet 2 is conveyed.

That is, after the sheet 2 is separated, no rotational force is transmitted to the separation roller 4, so that sheet skew can be effectively prevented.

The sheet 2 thus transported is pressed against the transport rollers 5a and 5b by the guide plate 7 urged by the spring 8, and is reliably transported.

A light source 10 for illuminating the sheet and a lens array 9 are arranged between the guide plate 7 and the discharge guide plate 12, and a reading sensor 11 sequentially reads the contents written on the sheet (original).

Once the processing of one sheet is completed as described above,
The drive source 13 rotates again in the direction of the dotted arrow and drives the separation roller 4 to separate the sheets, and the same process is repeated thereafter.

FIG. 3 shows another embodiment. In this embodiment, in addition to the shaft 60 to which the separation roller 4 and conveyance rollers 5a and 5b are attached, a shaft 61 for transmitting rotational force is separately arranged. 63.7
4 is a gear attached to each shaft 60.61, 65a,
65b and 65c are one-way clutches attached to the shaft 61;
68a, 68b, 67 are gears attached to these clutches; 63a, 63b are gears attached to the conveyance roller side that engage with these gears 68a, 68b; 64a, 64b are attached to these gears 63a, 63b and the one-way clutch This is another one-way clutch configured to transmit rotational force in the opposite rotational direction to 65a, 65b, and 65C. 75 is connected to the separation roller 4 and this separation roller 4
This is a gear that can freely rotate with respect to the shaft 60.

In this embodiment, the drive source 13 first rotates in the direction of the dotted arrow. Since the one-way clutches 65a, 65b, 65c are configured to transmit power in this rotational direction, the rotational force is transmitted from each one-way clutch 65a, 65b, 65c, gears 67.68a, 68b to gears 75.63a, 63b. The signal is transmitted to the separation roller 4 and conveyance rollers 5a and 5b via the separation roller 4, and the sheets are separated. Next, the drive source 13 is reversed in the direction of the solid arrow. Each one-way clutch 65a, 65b, 6
Since the roller 5c does not transmit rotational force in this direction of rotation, the separation roller 4 rotates freely. On the other hand, rotational force is transmitted to the one-way clutches 64a and 64b via the shaft 60, and gears 63a and 53b further transmit the rotational force to the conveying roller 5a.
, 5b, rotational force is continuously transmitted to convey the sheet.

〔effect〕

Since the present invention is configured as described above, the separation roller and the conveyance roller are both attached to a single shaft, which makes it possible to downsize the entire apparatus, and since the separation roller rotates freely after the sheets are separated, the sheet is conveyed. can be performed satisfactorily, and problems such as skew can be prevented from occurring.

[Brief explanation of the drawing]

FIG. 1 is a side view of a sheet transport device showing an embodiment of the present invention, FIG. 2 is a perspective view of the device shown in FIG. 1, and FIG. 3 is a perspective view of a sheet transport device showing another embodiment. Fig. 4 is a side view of a conventional sheet conveying device, and Fig. 5 is another conventional sheet conveying device.
- a perspective view of the transport device; 2... Sheet 4... Separation rollers 5a, 5b.
...Conveyance roller 6.60.61...Axes 17a, 17b, 19, 24a, 24b, 64a
, 64b, 65a, 65b, 65cm
--One-way clutches 16a, 16b, 18.21a, 21b, 23.23a
, 23b, 63.63a, 63b, 67.68a, 68
b, 75...Gear name: t""

Claims (3)

[Claims] (1) In a device that conveys sheets from a stacked sheet arrangement section to a reading section, the separation roller and the conveyance roller are attached to the same shaft, and each roller is connected to the rotation of the drive source via a power transmission member. 1. A sheet conveying device, characterized in that the sheet conveying device is configured to transmit respective forces, and the separating roller is configured to freely rotate after separating the sheets by the separating roller. (2) The power transmission member is interposed between a one-way clutch attached to the shaft, a gear attached to the one-way clutch, a gear attached to each separation roller and a conveyance roller, and each of these gears. It consists of another gear engaged, and another one-way clutch that is attached to the gear on the conveyance roller side and transmits rotational force in the opposite rotational direction to the one-way clutch, and the separation roller and the separation roller. The sheet conveying device according to claim 1, wherein the attached gear is configured to freely rotate with respect to the shaft. (3) A shaft is provided separately from the shaft to which the separation roller and the conveyance roller are attached, a gear is attached to this separate shaft through a one-way clutch, a gear is attached to the conveyance roller, and the conveyance roller is attached with a gear. For the gear attached to the separation roller, another one-way clutch is attached that transmits rotational force in the opposite direction of rotation to the one-way clutch attached to the other shaft, and the gear attached to the separation roller is Claims characterized in that the separating roller is configured to freely rotate with respect to a shaft together with the separating roller, and a gear attached to the separate shaft is engaged with a gear attached to the separating roller and the conveying roller, respectively. The sheet conveying device according to item (1).