JPS63160943A - Automatic paper feeder - Google Patents

Abstract

PURPOSE:To miniaturize and simplify a feeder in structure, by installing a paper feed roller and an original delivery roller on a single shaft, and installing a selector member, checking the delivery of plural originals, in the paper feed roller and a presser roller in the original delivery roller, respectively, at such a position as pressing the original held in between. CONSTITUTION:A paper feed roller 25 and an original delivery roller 26 are installed on a single paper feed shaft 23, and they are constituted that the paper feed roller 25 presses a selector member 27 so as to hold an original in between, and the original delivery roller 26 presses a presser roller 28 so as to hold the original 21 in between. With this constitution, plural originals 21 on an original mount 22 are first separated piece by piece with the paper feed roller 25 and the selector member 27 and drawn out, holding it between the original delivery roller 26 and the presser roller 28, thus it is feedable at the specified speed dependent upon a peripheral velocity of the original delivery roller. Therefore, the paper feed roller 25 and the original delivery roller 26 both can be set up in the single paper feed shaft 23 without sacrificing both automatic paper feeding and original delivery functions and, what is more, a feeder is miniaturizable and simplifiable in structure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic paper feeder that feeds a plurality of originals placed on a document table one by one into a document reading section in a facsimile machine or the like. As shown in FIGS. 4 and 5, conventional devices of this type include a document table 2 on which a plurality of stacked original documents 1 are placed, and a document table placed in a position where the leading edge of the documents on the document table 2 comes into contact. , a paper feed roller 3 that feeds out the original, a two-row shaft 5 that holds the paper feed roller 3 via a one-way clutch 4, and a paper feed roller 23 that presses the original in a sandwiching relationship to feed out a plurality of originals. a sorting piece 6 that prevents the document from being removed, a document feed roller 27 located downstream of the paper feed roller 3, a presser roller 8 that is pressed against the document feed roller 7 in such a manner as to sandwich the document, and a document detector that detects the document. A sensor 9, a motor 10 and a gear 11 that drive the roller shaft 5 and document feed row 27.
12.13, etc., from the document table 2 to the paper feed roller 3.
A sorting piece 6 separates the originals one by one while feeding the originals, and an original sending roller 7 sends the originals at a predetermined speed to the downstream reading unit 14 such as a contact type image sensor and the sending roller 1.
After a predetermined period of time (the time required for the leading edge of the original to reach the original reading position A of the reading unit 14) has elapsed, after the leading edge of the original is detected by the sensor 9, It was configured to stop and wait for transmission. In FIG. 4, 16 and 17 are gears for transmitting rotation to the transmission roller 15.

In addition, as shown in FIG. 6, the paper feed roller 3 and document feed roller 7 are arranged almost vertically, and the reading unit 14 using a reduction imaging system image sensor, the conveyance roller 18 downstream thereof, and the presser There is also known an apparatus in which the document 1 is fed almost vertically to the roller 19.

Problems to be Solved by the Invention However, according to such a conventional configuration, in order to supply the original to the original reading unit, there is a paper feed roller 3 that pulls out the original from the original platen, and an original delivery roller disposed downstream thereof. Therefore, it is necessary to arrange two roller shafts between the document table and the document reading section, which requires space and complicates the drive system.

The above-mentioned problem arises for the following reasons. That is, the paper feed roller 3 has the function of reliably separating and feeding the stacked originals on the document table one by one in cooperation with the sorting piece 6. It utilizes the difference in frictional force between the roller, document, and sorting piece. For this reason, a very soft material (for example, sponge rubber, etc.) is usually used as the paper feed roller. The document feeding speed using the paper feed roller and sorting piece depends on the thickness of the document,
It is usually not constant because it is affected by the paper quality and fluctuations in frictional force.

Therefore, when the document fed by the paper feed row 23 is sent directly to the document reading section without using the document sending roller 7, the leading edge of the document is detected by the document detection sensor located in front of the document reading section. When it stops after a certain period of time and enters the transmission standby state, the leading edge position of the original document becomes unstable and the transmission start position of the original document becomes irregular. In order to solve this problem, paper feed row 2
3 and the document detection sensor 9, a document feed roller capable of feeding the document at a predetermined speed is required, and in the conventional device, as shown in FIGS. The present invention has been made in view of the above-mentioned problems, and the present invention has been made in view of the above-mentioned problems. An object of the present invention is to provide an automatic paper feeding device that can be made smaller and simpler by eliminating the delivery roller shaft and providing a single shaft with a paper feeding function and a document sending function.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention aims to solve the above-mentioned problems by
A paper feed roller that feeds out the original from the document table and an original delivery roller that can feed the original at a predetermined speed are provided. The device is configured to press the sorting member and press a presser roller against the document feed roller so that the document is sandwiched between the document feed roller and the document feed roller.

According to the above-described structure, the present invention can separate and pull out a plurality of originals on the original platen one by one using the paper feeding roller and the sorting member, and the pulled out originals can be separated and pulled out one by one by the original feeding roller and the holding roller. It is possible to feed the document at a predetermined speed determined by the circumferential speed of the document feed roller. Therefore, the document feed roller and the document feed roller can be used as a single unit without sacrificing the automatic paper feeding function and the document feed function. The device can be placed on the axis of the device, making it possible to downsize and simplify the device.

Example Hereinafter, the present invention will be described in detail as shown in the drawings.

FIG. 1 is a plan view showing the main parts of a facsimile machine equipped with an automatic paper feeder according to an embodiment of the present invention, and FIG. 2 is a side view thereof. In the figure, 21 is a document, n is a document table, and O is a paper feed shaft. On this paper feed shaft n, a central paper feed roller 5 and document feed rollers 26 integrally provided on both sides thereof are connected via a one-way latch that transmits rotation in the direction of arrow B in FIG. is retained. A sorting member n is pressed against the paper feed roller 5 so as to sandwich the original 21 therebetween.

The paper feed roller 5 and the sorting member r are used to separate and feed out documents one by one from a large number of documents, and are made of the same materials as conventional ones. Here, the paper feed roller 5 and the document 2
1, the frictional force between the originals 21 is μ2, and the frictional force between the originals 21 and each sorting member is μ, then the relationship is set as μ,〉μ3〉μ2. In the embodiment shown in the drawings, a plate-shaped sorting piece is used as the sorting member, but a plate-shaped sorting piece may be used.

Rotatable presser rollers are pressed against the document feed rollers on both sides to sandwich the document 21. The contact position of this presser roller and document feed roller A is set downstream of the contact position of the paper feed roller 5 and each sorting member, so that the document on the document table n is sorted by the paper feed roller 5. After the sheets are separated one by one by the member section and fed out, the sheets are sandwiched between a document sending roller and a presser roller and sent out. Here, the document sending roller and presser roller Z are made of a material and have a structure that allows the document 21 to be stably sent out at a speed determined by the circumferential speed of the document sending roller, regardless of its thickness or paper quality.

Reference numeral 31 denotes a document detection sensor, a reading unit such as an image sensor that reads the document, 31 a transmission roller that presses the document against the reading unit 30 and conveys it, an Ohahals motor, and 34, 35, and 36 a pulse motor that controls its rotation. This is a gear that transmits information to the paper feed shaft and the transmission roller 31.

Next, the operation of the apparatus having the above configuration will be explained.

Documents 21 are stacked and set on document table n. The pulse motor is driven by the start signal, and the gear 34.35
．． 36, the paper feed shaft n1 transmission roller 31
Start rotating in the direction. Due to the rotation of the paper feed shaft B, the paper feed roller 5 also starts rotating in the direction of arrow B, and the document 21 on the document table ρ is
The tip of the is drawn between it and the sorting member n. At this time, as described above, the frictional force μ3 between the paper feed roller 6 and the document 21, the frictional force μ2 between the document 21, and the frictional force μ3 between the document 21 and each sorting member have the relationship μm>μ3>μ2. Since the setting is set to
The paper is fed through between the and the sorting members. Paper feed roller 5
After the leading edge of one document fed out passes the sorting member n, the document feed rollers integrally provided on both sides of the paper feed roller 5 are sandwiched between the presser rollers, and both rollers are held in place by the press roller. The driving force is used to send documents at a constant speed regardless of their thickness or paper quality.

The document 21 sent out via the paper feed roller 5, the document sending roller of the sorting member n1, and the presser roller A continues for a fixed period of time (7 hours) even after its leading edge is detected by the document detection sensor
The document is sent out by the operation of the pulse motor blade by a certain number of pulses, and stops when the leading edge reaches the document reading position A. After that, when the reading unit (9) starts reading and transmitting, the document moves past the sending roller 31. The signal is sent out at a predetermined speed through the inverter.

At this time, the speed of the sending roller 31 is set to be faster than the feeding speed of the paper feed roller δ and the document sending row 2.
Since the paper feed row 25 and document sending roller are held on the paper feed shaft via a one-way latch U, the sending row 231
There will be no interference between the two.

Although the above embodiment shows the case where the automatic paper feeder of the present invention is applied to a facsimile machine equipped with a reading unit using a contact type image sensor, the present invention is not limited to this case.
It is also possible to apply the present invention to a facsimile equipped with a reading unit consisting of a reduction imaging system image sensor using a CD image sensor, and an embodiment in that case is shown in FIG.

In Fig. 3, the same or similar parts as in the embodiments of Figs. low 52
5 and the output roller are held, and a sorting member n is attached to each of them.
, a presser roller is pressed, and by the rotation of this paper feed shaft, there is an automatic paper feeding function that separates and feeds the originals 21 on the original table n one by one, and feeds the originals at a predetermined speed. It is designed to perform a sending function. In the figure, numeral 37 is a transport roller, and numeral is a presser roller.0 Effects of the InventionAs is clear from the above explanation, the present invention has a feed roller that feeds out the original from the original table on a single shaft, and a paper feed roller that feeds the original from the original table. , a document feed roller capable of feeding the document at a predetermined speed, and a sorting member is pressed against the document feed roller so that the document is sandwiched between the document feed roller and the document feed roller. By using a configuration in which the presser roller is pressed so that the document is sandwiched between the document feed roller and the document feed roller, multiple documents on the document table are first separated into one sheet by the paper feed roller and the sorting member. The document is separated and pulled out, and then the pulled document is sandwiched between the document feed roller and the presser roller, and fed at a predetermined speed determined by the circumferential speed of the document feed roller. Therefore, the automatic paper feeding function It is possible to arrange the paper feed roller and the document feed roller 2 on a single axis without sacrificing the document feed function and the document feed function, which has the effect of making it possible to downsize and simplify the device. 0 that is a thing

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view showing the main parts of a facsimile IJ equipped with an automatic paper feeder according to one embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a side view showing another embodiment. , FIG. 4 is a partially sectional plan view showing the main parts of a conventional facsimile +7 equipped with an automatic paper feeder, FIG. 5 is a side view thereof, and FIG. 6 is a side view showing another conventional example. 21...Original, n...Original table, O...Paper feed shaft, U
...One-way clutch, 5...Paper feed roller, addition...
Document sending roller, n... sorting member, grease... holding roller, 4... document detection center, I... reading unit,
31... Transmission roller. Name of agent: Patent attorney Toshio Nakao and one other person Figure 3 Figure 4

Claims (1)

[Claims] A document table on which multiple stacked originals are placed, a paper feed roller placed in a position that contacts the leading edge of the document on this document table and feeds out the document, and a document that is pressed against the document feed roller so that the document is sandwiched between the sheets. an automatic paper feeder comprising: a sorting member that prevents the document from being fed; a document feed roller disposed coaxially with the paper feed roller; and a presser roller pressed against the document feed roller in a position to sandwich the document. .