JPH0223125A - Medium feed-out mechanism - Google Patents

Abstract

PURPOSE:To smoothly feed out medium and prevent failure of feed-out of medium by mounting a primary and a secondary adjustment means which adjust the pressure forces of a resilient plate and a pressure member. CONSTITUTION:Contact levers 14 and 16 make contact with the upper end parts of an initial transfer spring 9b and a pressure spring 11b to give pressure thereto, respectively. Each of these pressures is adjusted in three degrees by the change-over operation of an operation lever 15 or 17. If a sheet of paper 1a fed out is high quality of 80M in thickness, these operation levers 15 and 17 are set in the middle position and if the sheet of paper is a PPC copy form, the operation lever 15 is set in the maximum position and the change-over operation lever 17 is in the middle position to feed out the form. By change-over operation of these operation levers 15 and 17, the pressures of the initial transfer spring 9b and the pressure spring 11b may thus be adjusted to feed out sheets smoothly.

Description

[Detailed description of the invention] 〔overview〕.

Regarding a medium feeding mechanism that can adjust the pressing force of an elastic plate that presses against a feeding roller and the pressing force of a pressure member that presses a pressing plate that comes into contact with a feeding roller, the medium feeding mechanism can prevent media feeding defects. The purpose of this mechanism is to provide a feeding roller that is made of a resin material that is elastic and has a large coefficient of friction, and an elastic roller that presses against the surface of the feeding roller and regulates the tip of the medium being fed at the pressed position. A pressing plate made of a resin material with a large friction coefficient that contacts the surface of the feeding roller in front of the elastic plate and is pressed by a pressure member, and is set behind the pressure contact position of the elastic plate. A medium feeding mechanism that feeds out a plurality of sheets of media one by one by rotation of a feeding roller, comprising a first adjusting means for adjusting the pressing force of the elastic plate, and a second adjusting means for adjusting the pressing force of the pressing member. The medium is fed out by rotation of the feeding roller by adjusting the pressing force of the elastic plate and the elastic member to a desired combination by the first and second adjusting means.

[Industrial application field]

The present invention relates to a document and recording paper feeding mechanism of a facsimile (hereinafter referred to as FAX) machine, etc., and particularly relates to the pressing force of an elastic plate that presses against a feeding roller and the pressure of a pressure member that presses a pressing plate that comes into contact with a feeding roller. The present invention relates to a medium delivery mechanism whose pressure can be adjusted respectively.

[Conventional technology]

FIG. 5 shows a side view of the FAX machine, and in the figure, reference numeral 2 denotes a reading surface made of glass, for example.

Reference numeral 3 denotes a presser plate that holds down the original 1a placed on the reading surface 2, 4 a setting table attached at an angle to the top surface of the end of the presser plate 2, and 5 a single-motion sheet feeding mechanism (Au
to-Docun+ent Feeder: hereinafter referred to as ADF
) 50, and 6 indicates a stacker.

The image sensor 7 is arranged in the device below the automatic paper feeder 5, and is moved along the lower surface of the reading surface 2 by a moving mechanism (not shown) in the directions of arrows A and B between the position shown by the two-dot chain line in the figure. Travel back and forth.

Therefore, the original 1a can be read in the following two ways.

(1) Set the originals 1a one by one facing down on the reading surface 2, and read them by moving the image sensor 7 from the home position in the direction of arrow A. This method is used when there is a small number of documents for immediate transmission.

■ Place multiple originals 1a on the setting table 4 and use the ADF5.
0, one sheet at a time, and the image sensor 7, which is stationary at the home position, reads the sheets. Manuscript 1a
is sent to the stacker 6. This method is used when there are a large number of originals or when automatically sending documents at a specified time.

The present invention relates to, for example, the ADF 50 (1), and the mechanism will be explained below.

As shown in the side view of FIG. 6, the ADF 50 is made of a resin material 5 having a large coefficient of friction, such as rubber, and is formed into a flat plate shape using a stainless steel plate for a spring. An initial conveyance spring 9a whose tip end presses against the surface of the initial conveyance spring 9a, a resin material 1 having elasticity that contacts the surface of the feeding roller 8a in front of the initial conveyance spring 9a, a separate plate 10a made of, for example, rubber; is composed of a pressure spring lla that presses the separate plate 10a from the back side and a document set sensor S.

The feeding roller 8a is connected to a motor (not shown).

With such a configuration, when the original 1a is set on the setting table 4, the leading edge of the original 1a is regulated at the position where it is pressed against the feeding roller 8a of the initial conveyance spring 9a, and
The document set sensor S detects this, and the feeding roller 8a starts rotating.

The original 1a is first transported by the initial conveyance spring 9a and the feeding roller 8a.
At this time, a conveyance force is applied to the document 1a due to the difference in frictional force between the initial conveyance spring 9a and the document 1a, and between the document 1a and the feeding roller 8a. At this time, the originals 18 may be separated from each other.
The original 1a is separated due to the difference in the frictional force in the order shown on the left, and is sent out sheet by sheet and supplied above the image sensor 7.

In this case, if the document 1a to be fed out has different characteristics such as paper thickness and paper quality (surface roughness), double feeding occurs.

Since feeding defects such as jams are likely to occur, the pressing force of the initial conveyance spring 9a and the pressure spring lla is adjusted to cope with the problem.

In contrast, Japanese Patent Application No. 62-095543 discloses a technique in which an adjustment means is provided for adjusting the pressing force of the initial conveyance spring in a plurality of stages.

[Problem to be solved by the invention]

According to the above conventional method, both the initial conveyance spring and the pressure spring are cantilevered beams, and in order to adjust the spring pressure, it is necessary to disassemble the device and change the spring shape.

However, the paper separation ability has characteristics as shown in FIG. 7, depending on the pressing force of the initial conveyance spring and the pressure spring. In other words, with respect to the strength of the pressing force of the initial conveyance spring shown in Fig. 7(a), if it is too strong, there is a high incidence of problems such as double feeding and jamming of thin paper (if it is too weak, it will not be fed out smoothly, so-called retraction failure) In addition, if it is too strong, the rate of retraction failure will increase, and the noise will increase. If it is too weak, double feed and The occurrence rate of problems due to thin paper jams is high.Furthermore, since this characteristic changes depending on the type and thickness of the paper, it is necessary to select the spring pressure according to each paper, so the initial conveyance spring and pressure spring should be carefully selected. Adjusting the pressing force by changing the shape of the spring requires skill and is extremely difficult, and it is almost impossible for the user to adjust it.

Further, in the method disclosed in Japanese Patent Application No. 62-095543, only the initial conveyance spring is adjusted by an adjusting means, and for the above-mentioned reasons, the adjustment is insufficient to accommodate a wide variety of paper thicknesses and paper qualities.

There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a medium feeding mechanism that can prevent failures in feeding the medium.

(Means for solving problems) FIG. 1 shows a diagram of the principle of the present invention.

In the figure, 1 is a medium, 8 is a feeding roller, 9 is an elastic plate, 10 is a pressing plate, 11 is a pressure member, and 12 is a first adjusting means for adjusting the pressing force of the elastic plate 9 that is in pressure contact with the feeding roller 8. , 13 is a second adjusting means for adjusting the pressing force of the pressing member 11 that presses the pressing plate 10.

Therefore, the pressing force of the elastic plate 9 and the pressing force of the pressing member 11 are adjusted to a desired combination by the first adjusting means 12 and the second adjusting means 13, and the medium 1 is fed out by the rotation of the feeding roller 8. It is configured.

[Effect]

In order to adapt to the type of medium 1, that is, paper thickness 5 paper quality, etc.
Adjusting the pressing force of the elastic plate 9 by the first adjusting means 12,
In addition, by adjusting the pressure force of the pressure member 11 using the second adjustment means 13 and setting the combination, fine adjustments can be made in response to different types of media 1, so smooth feeding is possible. , double feed, jam, and poor retraction can be prevented.

〔Example〕

An embodiment according to the present invention will be explained with reference to FIGS. 2 to 4. The same reference numerals indicate the same objects throughout the figures. Also the second
In the figure, parts corresponding to FIG. 1 are surrounded by a dashed line.

As shown in FIG. 2, the initial conveyance spring 9b and the pressure spring l
Spring pressure variable mechanisms 12a, 13a are installed above the tip of the lb.
is provided. The spring pressure variable mechanisms 12a and 13a are
contact lever 14.16 and switching control lever 15.1 respectively
It consists of 7.

The contact levers 14, 16 contact and apply pressure to the upper sides of the tip ends of the initial conveyance spring 9b and the pressure spring llb, respectively,
The pressurizing force is adjusted in three steps by switching the switching operation levers 15 and 17, as shown by solid lines and broken lines 1 to 2 in FIG. 3, respectively. That is, the switching operation lever 15.1
By switching 7, 9 different combinations can be made.

Therefore, adjustment can be made by selecting and setting an appropriate combination depending on paper quality and paper thickness. For example, FIG. 4 shows switching positions to be selected depending on the paper type of the original 1a.

With this configuration, when the document 1a to be fed out is, for example, high-quality paper with a thickness of 80 μm, the switching operation levers 15 and 17 are both set to the middle position (■ in FIG. 3), and the copy When using PPC paper, move the switching operation lever 15 to the large (■ in Figure 3) position.
All you have to do is set the number 7 to the middle position and start feeding.

In this way, by switching the switching operation lever 15.17, the pressure applied by the contact lever 14.16 to the initial yA conveyance spring 9b and the pressure spring llb can be adjusted, and a combination of both pressure forces can be easily set. is completed, manuscript 1
Since feeding can be performed by making adjustments over a wide range according to the paper quality and thickness of a, double feeding, poor drawing, and jams can be prevented, and smooth feeding can be achieved.

Although the above example describes the case of feeding out a document in a FAX, it can also be applied to feeding out a cut sheet in a printer, etc., and the same effect can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the respective pressing forces of the elastic plate that presses against the feeding roller and the pressure member that presses the pressing plate that contacts the feeding roller are adjusted by the first and second adjusting means. Therefore, it is easy to adjust to accommodate a wide range of media thickness and paper quality by combining the adjustment pressure force, prevents double feeding, poor retraction, and jams, and enables smooth feeding. There is an effect.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention; Fig. 2 is a perspective view showing an embodiment of the invention; Fig. 3 is an explanatory diagram of the embodiment; Fig. 4 is a diagram showing an example of adjustment depending on the type of paper; FIG. 5 is a side view of a FAX machine to which the present invention is applied, FIG. 6 is a side view of a conventional example, and FIG. 7 is an explanatory diagram of failure occurrence. In the figure, 1 is a medium, 1a is a document, 8.8a is a feeding roller, 9 is an elastic plate, 9a, 9b are initial conveyance springs, 1O is a pressure plate, 10a is a separate plate, 11 is a pressure member, lla, llb 12 is a pressure spring, 12 is a first adjustment means, 12a and 13a are spring pressure variable mechanisms,
13 indicates a second adjusting means. Embedded configuration diagram of the present invention Fig. 1.1 Perspective view showing almost all the details. Side view of the FAX machine 7 Figure 5 What is the situation now?

Claims (1)

[Claims] A feeding roller (8) made of a resin material having elasticity and a large coefficient of friction, and a medium (8) that is in pressure contact with the surface of the feeding roller (8) to be supplied.
An elastic plate (9) that regulates the tip of the roller (1) at the pressed position; and a pressing plate (10) formed of a resin material with a large coefficient of friction, and the plurality of media (1) set behind the pressure contact position of the elastic plate (9) are moved by the feeding roller (8). It is a medium feeding mechanism that feeds out one sheet at a time by rotation, and includes a first adjusting means (12) that adjusts the pressing force of the elastic plate (9) that is in pressure contact with the feeding roller (8), and the pressing plate (10). ) for adjusting the pressing force of the pressing member (11) that pressurizes the
adjusting means (13), and adjusting the pressing force of the elastic plate (9) and the pressing force of the pressing member (11) by adjusting the first adjusting means (13).
12) and a second adjustment means (13) to provide a desired combination, and the medium (1) is delivered by rotation of the delivery roller (8).