JPS59149246A - Automatic original-copy feeding apparatus for facsimile - Google Patents

Abstract

PURPOSE:To permit an original-copy to be transported stably and certainly by forming a frictional-force increasing part onto the peripheral surface of a feeding roller and an original-copy separating roller and increasing the frictional force between the rollers and the original-copy. CONSTITUTION:Since a feed roller 1A and an original-copy separating roller 3A are equipped with the respecive friction increasing parts 23 and 25, the frictional force between an original copy in one direction increases considerably, and when the second original copy 2B on the lowest original copy 2A is sent between the rollers 1A and 3A, a portion of the frictional-force increasing part 25 of the original-copy separating roller 3A is made contact with the lowermost original copy 2A and the second original copy 2B at a same time. Then, the driving force for transferring the original copy 2B by the friction between the feeding roller 1A and the original copy 2B and the driving force for returning pulling back the manuscript 2B which is transmitted to the shaft an original-copy separating roller 12 through a gear transmission mechanism and pulls back the original copy are balanced, in the sliding clutch part 17 of the original-copy separating roller 3A, and the revolution of the original-copy separating roller 3A is suspended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic facsimile document feeder for sending documents.

[Prior art]

2. Description of the Related Art Conventionally, as an automatic document feeder in a transmitting section of a facsimile machine, one configured as shown in FIG. 1 has been known. That is, 1 is a feed roller that feeds the document 2, 3 is a document separation roller that comes into pressure contact with the feed roller 1,
Reference numerals 4 and 5 denote document ejection rollers, and 6 a document table. The rollers 1 and 3 feed the document 2 stacked on the document table 6 in order from the bottom. The roller 21 is rotationally driven in the direction of feeding the document 2 by a drive means (not shown), while the document separation roller 3 in contact with the roller 21 is driven by another drive means via a slip clutch (not shown). It is driven to rotate in the opposite direction to the feed roller 1. In other words, both ends 21 and 3 are rotated in the same direction, but when looking at the contact portion of both rollers 1 and 3, both rollers 1 and 3 are rotated in the same direction.
, 3 means that they are moving in the opposite direction. In such a configuration, when the feed roller 21 is driven when there is no document 2 or only one document 2 is placed on the document table 6, the document separation roller 3 moves through the slip clutch. Even though the feed roller 1 is rotated in the opposite direction, the driving force due to the frictional force between the two ends 21 and 3 or the driving force due to the frictional force between the feed roller 21 and the document 2 does not slip. Since the driving force is larger than that of the clutch, the document 2 is driven in the direction to feed the document 2 (while slipping occurs in the slip clutch portion). On the other hand, when there are two or more documents 2, when the feed roller 1 is driven, the lowest document 2 is held between the feed roller 1 and the document separation roller 3 and sent out as described above. However, since the driving force of the Sisberg clutch is greater than the driving force of the sliding friction force between the stacked originals 2, the original separating row 23 is driven in the direction to return the remaining originals 2, and the originals 2 are separated from each other. During this time, slipping occurs, and only the lowest document 2 in contact with the feed roller 1 is fed in the forward direction, and the remaining documents are stopped by the document separation row 23 from the two companies. The driving force from the clutch and slip clutch is smaller than the driving force due to the frictional force between the rows 21 and 3 or between the roller 1 and the document 2, and is larger than the driving force due to the frictional force between the document 2. It will be adjusted. Here, the manner in which documents 2 other than the bottom layer are stopped will be described in more detail based on FIG. 2 as follows.

That is, in the figure, two people are working on the lowest document, 2B is a stationary document, and these documents 2A and 2B are held between the feed roller 1 and the document separation row 23. The original 2B is returned to the original separation roller 3 and
When the document separation roller 3 is removed from the document separation roller 3, the document separation roller 3 comes into contact with the two documents in the lowest layer. The driving force at this time is smaller than the driving force caused by the frictional force between the feeding rollers 1 and 3 and the document 2A, and therefore the document separation roller 3 is rotated in the direction to feed the document 2A, and the document separation roller 3 is rotated in the direction to feed the document 2A. It works together with the feed roller 1 to transfer. When these two manuscripts are transferred, the two people in contact with them
The original document 2B is sent in the forward direction by the frictional force with the original document 2A, and is guided between the feed white=21 and the document separation row 3. Then, the document separating roller 3 rotates in the opposite direction again for the reason mentioned above. For this reason, manuscripts 2A, 2
A slippage occurs between B, and the second document 2B is returned to the original loading position again. In other words, original 2B is the lowest original 2.
The document is continuously moved back and forth over the two people until the document is completely fed out, but the amount of movement must be set as small as possible to prevent the document from shifting or meandering. be. Therefore, as shown in FIG. 1, by tilting the document table 6 greatly, the document 2 is caused to slide between the feed roller 1 and the document separation roller 3 by its own weight, or the document separation roller 3 The outer diameter of the feed roller 1 is made larger than that of the feed roller 1, and the originals 2A and 2B are transferred to both rollers 1 and 3.
Alternatively, as shown in FIG. 3, a belt 7 is used in place of the document separation roller to reduce the amount of movement of the document 2B, thereby preventing the document from shifting or meandering. .

On the other hand, the types and thickness of original documents 2 used in facsimile machines are not constant, and it is said that there are 10 to 15 types in Japan, and 5 to 10 more types in foreign countries. is used.

For this reason, in conventional devices of this type, the document 2 is
If the thickness of the slider changes, the contact pressure between the feed roller 1 and document separation roller 3 will change easily, and the sliding friction between the documents 2 will change. Therefore, it is necessary to adjust the sliding friction force of the sliding clutch. The disadvantage is that it is very difficult to
There was a problem that double feeding, such as sheet feeding, occurred. Furthermore, it requires a break-in adjustment to maintain stable operation.
Furthermore, increasing the outer diameter of the document separation roller causes various problems, such as increasing the size of the apparatus itself.

[Summary of the invention]

The present invention was made in view of the above-mentioned circumstances, and
A friction force increasing portion is provided on the circumferential surface of the feed roller and document separation roller, and a sliding mechanism with a simple structure and stable operation is created between the feed roller and a gear transmission mechanism that transmits the rotation of the roller to the document separation roller. An object of the present invention is to provide an automatic facsimile document feeder which solves the above problems at once by providing a new driving means consisting of a clutch, and which enables stable and reliable document feed.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 4 is a schematic configuration diagram showing an embodiment of an automatic document feeder according to the present invention, and FIGS. FIG. 6 is an enlarged side view of a main part of the device, FIG. 7 is an enlarged partial explanatory view of a feed roller provided in the device, and FIG. 8 is an enlarged sectional view thereof. Components in the drawings that are the same as those in FIGS. 1 to 3 are designated by the same reference numerals, and their explanations will be omitted. In FIG. 5, reference numeral 10 denotes a feed roller shaft to which a feed roller and a drive gear 11 are fixed. Rotation from a motor (not shown) is transmitted to the drive gear 11 to rotate the feed roller 21A in the document feeding direction. It is configured to allow Reference numeral 12 denotes a document separation roller shaft, and in addition to the document separation row 23A, a driven gear 13 corresponding to the drive gear 11 is rotatably disposed on this roller shaft 12 via a bearing 14.

This driven roller 13 is always given the habit of moving in the direction of the original separation roller 3A by a spring 16 fitted onto the roller shaft 12 and having one end locked by a spring presser 15. is pressed against the driving means 24. This driving means 24 includes the roller and the shaft 12.
The clutch plate 1B is fixed to the clutch plate 1B and a sliding friction member 17. The original separation roller shaft 12 is biased toward the feed roller shaft 10 by a pressure spring 20 . Therefore, the document separating roller 3A is moved to the feeding roller 2 with a predetermined contact pressure.
Being pressured by one person. The driving gear 11 and the driven gear 1
An intermediate gear 21 is interposed between the intermediate gear 3 and the intermediate gear 21, and these constitute a gear transmission mechanism 22. The feeding girdle 21A is made of an elastic material such as rubber, synthetic rubber, or plastic, and has a plurality of approximately wedge-shaped frictional force increasing portions 23 integrally protruding from its surface as shown in FIGS. 6 to 8. It is set up. When the feeder roller 21 rotates in the direction of the arrow in FIG. 6, this frictional force increasing portion 23 bites into the bottom two originals, so that its rear end, that is, the document feeder side end, is attached to the circumferential surface of the feeder roller 1A. It is set up floating from the top.

Similarly, as shown in the figure, a plurality of frictional force increasing portions 25 similar to one of the feed rollers are provided on the circumferential surface of the document separating roller 3A in the opposite direction to the frictional force increasing portions 23.

Next, a document feeding operation in the automatic document feeding apparatus having the above configuration will be described.

When there is one document 2 on the document table 6, when the rotation of the document 2 is transmitted to the feed roller shaft 10 via the drive gear 11 as the motor is driven, the feed roller 1A is rotated in the document feed direction, and the Since the rotation of the feed roller shaft 10 driven by the motor is transmitted to the document separation roller shaft 12 via the gear transmission mechanism 22 and the driving means 24, the document separation row 23A is rotated in the opposite direction to the rotation direction of the feed roller 1A. . That is, if explained with reference to FIG. 5(b), the drive gear 1
1 rotates to the right, for example, the intermediate gear 21 rotates to the left. Therefore, the driven gear 13 rotates to the right like the driving gear 11.

Therefore, if we look at this between the feed roller 1A and document separation roller 3, both rollers LA and 3A will rotate in opposite directions as shown by the arrows in FIG. Therefore, since only one document 2 is fed between the roller 1A and the document separation roller 23A by the feeding roller 21A, both rollers l
Since the load (friction) between rollers A and 3A is small, the driving force due to the sliding friction force between the rollers IA and 3A is greater, so the rollers are fed between rollers IA and 3A.

Next, when two or more originals 2 are set on the original platen 6, one feed roller is rotationally driven to feed the plurality of originals 2 between the row 21A and the original separating row 23A. At this time, since the document separation row 23A is rotated in the opposite direction to the single feed roller as shown by the arrow in FIG. 6, friction increases between both rollers IA and 3A due to the plurality of documents 2. However, slippage occurs between the two documents. Therefore, the originals 2 except for the bottom layer are stopped or pulled back. That is, this slipping occurs because the sliding frictional force at the sliding clutch portion, that is, the sliding frictional member 17 portion, is greater than the sliding frictional force between the documents 2.

The driven gear 13 is engaged with the pick drive gear 11 and rotates, but the rotation of the document separation roller 3A is caused by the increase in load (friction) caused by the multiple sheets of document 2 being fed into the document separation roller 23A. When the document separation roller shaft 12 is stopped, the groove friction member 17 is in a sliding state, and the original separation roller shaft 12 stops rotating. Therefore, the movement of the document separation roller 3A is also stagnant. As a result, the feeder roller 21 and the document separation roller 23A each have a frictional force increasing portion 23.2.
5, the frictional force with the original 2 in one direction is much larger than that of conventional rollers that do not have a friction force increasing part. When the sheet of original 2B is fed between the rollers IA and 3A, the original separating roller 3A is moved by the frictional force increasing portion 2 of the original separating roller 3A.
5 comes into contact with the two originals on the bottom layer and the second original 2B at the same time. The sliding clutch portion of the document separation roller 3A, that is, the sliding friction member 17, generates a driving force for transporting the document 2B by friction between one feed roller and the document 2B, and a drive force for transferring the document 2B via the gear transmission mechanism 22. The original separating roller 3A is stopped when the driving force transmitted to the separating roller shaft 12 and attempting to pull back the original 2B is balanced. Therefore, the amount of movement of the document in the back and forth direction that occurs when the feed roller and document separation roller are combined as in the conventional structure can be made much smaller. In addition, the feed roller 1A and document separation roller 3A
The frictional force increasing portion 23° 25 provided at
Since the sliding friction force between the roller ush and the roller ush can be reduced and kept almost constant, the slip clutch section can operate stably, enabling good and reliable document feeding. .

In addition, to explain in more detail about the feeding girdle 21A, in this embodiment, as shown in FIGS. 7 and 8, the frictional force increasing portions 23 are arranged in a specially defined manner in rows or columns, and are not arranged randomly. is forming. According to this embodiment, the feed roller 1
The total length a of A is about 180 to 280 mm, and its diameter is about 12 mm.
~20 tnm, the ratio of the surface area n where the frictional force increasing portion 23 is formed to the total circumferential area is 5 of the total circumferential area.
It is preferable that 0%<n<80%. Also a = 23
In the embodiment where 0 mtn # b = 16 mm, each part of the frictional force increasing portion 23 has a length c = 10 to 20 iut
*Width d=0.1-0.2.

Good results have been obtained when the height e is about 0.05 to 0.1 w and the distance f between the frictional force increasing parts 23 is about 511 v g or less than about 1. F3
The same applies to A.

〔Effect of the invention〕

As explained above, the facsimile automatic document feeder according to the present invention has a friction force increasing portion formed on the circumferential surfaces of the feed roller and the document separation roller to increase the friction force between the rollers and the document. It is possible to stably and reliably feed documents, and since there is no need to increase the outer diameter of the document separation roller, it is possible to downsize the device itself. Furthermore, the structure of the document separation roller section including the slip latch section is simple, and the effects are very large.

[Brief explanation of the drawing]

1 and 2 are schematic configuration diagrams showing an example of a conventional automatic document feeder and a diagram for explaining feeding, and FIG. 3 is a diagram showing another example of a conventional automatic document feeder. FIG. 4 is a schematic diagram showing an embodiment of the automatic document feeder according to the present invention, and FIGS. 6 is an enlarged side view of the main part of the device, FIG. 7 is a partially enlarged explanatory view of a feed roller provided in the device, and FIG. 8 is a cross-sectional explanatory view thereof. 1.1 person...feeding roller, 2...manuscript, 3.3
A--Document separation roller, 20...Press spring, 2
2...Gear transmission mechanism, 24. ...Driving means. Patent applicant: Iwasaki Tsushinki Co., Ltd. Agent: Masaki Yamakawa (and one other person)

Claims (1)

[Claims] A feed roller having a frictional force increasing portion on its circumferential surface for feeding the document; a document separating roller having a frictional force increasing portion on its curved surface and disposed in contact with the feed roller; a gear transmission mechanism that transmits transmission to the document separation roller;
An automatic facsimile document sending device characterized by comprising: a driving means comprising a slip clutch mechanism interposed between the document separation roller and the gear transmission mechanism.