JPH01288532A - Paper separating device - Google Patents

Abstract

PURPOSE:To easily prevent the vibration and squeak noise due to the friction between paper and a separating belt by installing a vibration absorbing plate having a vibration absorbing weight supporting plate and a vibration absorbing weight. CONSTITUTION:A paper separating device is equipped with a freely rotatable transport belt 1 and a separating belt 2 arranged oppositely to the transport belt 1. The transport belt 1 of the paper feeding device which transports paper one by one between the transport belt 1 and the separating belt 2 takes out the lowermost paper among the piled paper sheets 3 and sends said paper, and the separating belt 2 separation-obstructs the paper. A vibration absorbing plate 6 having a swingable vibration absorbing weight supporting plate 4 which has a recessed part in a prescribed angle and a cylindrical vibration absorbing weight 5 which is installed onto the recessed part of the vibration absorbing weight supporting plate 4 is installed onto the supporting part of the separating belt 2. Therefore, the vibration attenuation due to the coulomb friction is generated between the vibration absorbing weight 5 and the vibration absorbing weight plate 4, and the vibration and squeak noise which are generated between the paper and the separating belt 2 can be easily reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper separating device.

[Conventional technology]

A conventional paper separation device that uses a paper feeding device to sequentially take out the paper from the bottom first separates and feeds the paper using a conveyor belt and a separation belt that are arranged opposite to each other.

Note that Japanese Patent Publication No. 62-7093 is related to this.

[Problem to be solved by the invention]

A separation device that takes out paper sequentially from the bottom, and a system in which a separation bell L- is opposed to a conveyor belt I has been commonly used in the past, but the paper separation performance in this system is determined by the frictional force of the separation bell 1-. It is determined approximately by the magnitude of the blocking force of the next paper by the conveyance heddle and the magnitude of the paper feeding force by the conveyance heald. Therefore, when it is desired to increase the number of sheets to be set, the frictional force between the sheet to be fed and the next sheet to be blocked increases due to the increased weight of the upper sheet, so it is necessary to increase both the conveyance force and the separation frictional force. However, this time order is caused by stick-slip vibrations caused by friction between the paper and the separation belt, which causes so-called squealing noise, which can become unbearable for use in OA machines, etc., especially when the final paper In this case, the next paper does not get into the separation belt section, so the squeaking noise becomes louder. - Possible solutions for boat fishing include separation, increasing the material of the conveyor belt, and increasing the rigidity of surrounding structures, but these take time and cost and are not easy to do. In addition, the conventional vibration absorption effect consisting of an elastic body and weight has a large effect at the characteristic frequency (resonant frequency), but it has the disadvantage that the effect decreases when the frequency shifts, and the effect becomes less effective when the surrounding structure changes. There was a drawback that it became less.

The present invention was made in view of the above points, and an object of the present invention is to provide a paper separating device that can reduce vibrations caused by friction between paper and a separating belt and easily prevent squealing noise. It is something to do.

[Means for Solving the Problems] The above object is to provide a swingable vibration absorbing weight support plate having a recess at a predetermined angle in the support portion of the separation belt, and a cylinder mounted on the recess of the vibration absorbing weight support plate. This is achieved by providing a vibration absorbing weight having a shape of a vibration absorbing weight.

[Effect]

A vibration absorbing member having a swingable vibration absorbing weight support plate having a concave portion at a predetermined angle and a cylindrical vibration absorbing weight attached to the concave portion of the vibration absorbing way support plate is provided on the support portion of the separation belt. Therefore, when vibration occurs, vibration damping occurs due to Coulomb friction between the vibration absorbing weight and the vibration absorbing weight support plate, reducing vibrations caused by stick-slip etc. that occur between the paper and the separation bell 1. This makes it easier to prevent squealing noises.

In other words, what is important in a paper feeding device is how to separate a plurality of stacked sheets of paper one by one, and how to feed the paper quietly without chatter vibrations or squealing noises. In particular, in the paper (original) feeder of the bottom take-out method, which is the subject of this invention, the weight of the stacked papers (maximum
Due to the influence of A size (50 sheets) and the miscellaneous paper types, placing emphasis on single-sheet feeding may result in loud squealing noise. Therefore, in the present invention, we conducted a frequency analysis of vibration and noise, found a frequency that occurs consistently due to the structure, and attempted to reduce vibration by using vibration absorption benefits.

We discovered that placing a cylindrical magnet on the vibration-absorbing weight support plate had a great effect.As a way to obtain the same effect, we used a round rod as the vibration-absorbing weight and placed it on the vibration-absorbing weight support plate bent at a certain angle (approximately 140 degrees). It was confirmed that there is an effect.

This is because vibration damping occurs due to Coulomb friction between the vibration absorbing weight and the vibration absorbing weight support plate.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-3.

The paper separation device includes a rotatable conveyor belt 1 and a separation belt 2 disposed opposite to the conveyor belt 1.

1 is passed between the conveyor belt 1 and the separation belt 2.
A conveyance belt 1 of a paper feeding device, which feeds sheets one by one, takes out and sends the paper below the stacked sheets 3, and a separation belt 2 has a function of preventing separation of the sheets. In this embodiment, in a paper separation device that sequentially takes out paper from the bottom, a swingable vibration-absorbing weight support plate 4 having a concave portion at a predetermined angle is provided at the support portion of the separation belt 2, and this vibration-absorbing weight A vibration absorber 6 having a cylindrical vibration absorber weight 5 attached to the recess 2 of the support plate 4 is provided. By doing so, when vibration occurs, vibration damping occurs due to Coulomb friction between the vibration absorbing weight 5 and the vibration absorbing weight support plate 4, and vibrations due to stick-slip etc. occurring between the paper and the separation belt 2 are reduced. It is possible to obtain a paper separating device that can easily reduce the squealing noise, reduce vibrations caused by friction between the paper and the separation bell 1 to 2, and easily prevent the squealing noise.

That is, the cylindrical vibration-absorbing weight 5 was attached using a support pin 7 that was in contact with the recessed portion of the vibration-absorbing weight support plate 4 at two places and provided with a gap between the vibration-absorbing weight 5 and the vibration-absorbing weight 5 . By doing this, it will operate as described below. As shown in FIG. 1, the document (paper) feeding device in an image scanner that files image information rotates a conveyance shaft 8 to wrap the document between a conveyance roller 10 and a driven roller 11 via a way-way clutch 9. By rotating the conveyor belt 1 , a drive is applied to the lowest sheet of original documents (stacked sheets) 3 set on a sheet guide 12 and a hopper 13 .

When the document 3 passes between the conveyor belt 1 and the separation belt 2 pressed by a separation pressure spring, it is separated into the lowest sheet of paper and moved to the sheet guide 14. ．． 15 between paper feed rollers 16
, 16a and 17. The paper is fed from the left side to the right side in the figure by 17a, and is irradiated and scanned by the lamp 20 of the image scanner 19 while passing over the transparent glass 18, and is further guided by the sheet guide 1 21, 22. Then, the paper is discharged 3a by paper discharge rollers 23, 23a. The sponge roller 24 is used to suppress the vibration of the separated document 3 on the transparent glass 18 during scanning.
The board 25 is for controllers 1 to 1 of each drive system, and 26 and 27 are upper and lower covers of the entire device.

Next, the document separating mechanism section, that is, the paper separating device will be described in detail. First, approximately 50 sheets of originals 3 are inserted by the operator from the left side in the figure, by sliding them over the hopper 13 while pushing the paper weight plate 28 supported by a shaft until the leading edge contacts the separation belt 2. , is set. Separation device is shaft 29
The shaft 3 is connected to the holder 30 supported by the shaft 3 through the bearing 31.
A support fitting 33 is supported at 2, and the separation belt 2 is fixed to this support fitting 33. Further, an arm 34 is integrally formed on the support fitting 33, and a vibration absorbing weight support plate 4 and a vibration absorbing weight 5 are fixed to the upper surface of this arm 34, thereby ensuring a gap between the arm 34 and the holder 30. . Therefore, the separation belt 2 is integrated with the support metal fitting 33, the arm 34, and the vibration absorbing weight support plate 4, and can swing on the conveyor belt 1 by the gap between the arm 34 and the holder 30 about the shaft 32.

Furthermore, although the vibration absorbing weight support plate 4 and the vibration absorbing weight 5 have been described above, as shown in FIG. It is supported so that it can move freely.

The operation of the separator having the above-mentioned configuration will now be described. When the operation switch is turned on, as shown in FIG. 2, the conveyor belt 1 rotates with the rotation of the conveyor shaft 8, and at the same time, a solenoid (not shown) moves the conveyor belt 1 from position 1a to position 1b. When the document 3 is lifted up by the paper presser Elite 35, a conveying force is applied to the entire document 3, and it is pressed against the separation belt 2, and one or more sheets in the lower layer slip under the separation belt 2 from the tip. Due to the separating action of the separating belt 2, only the bottom sheet is fed.

When the leading edge of the paper passes the paper feed rollers 1.6, 16a and reaches the paper feed rollers 17, 17a, the drive of the conveyance shaft 8 is stopped, and at the same time, the excitation of the solenoid is also stopped, and the conveyance belt 1 is at position 1a. be returned. Therefore, the document is pulled by the paper feed rollers 16, 16a, and 17.17a, and while the paper is interposed between the separation belt 2 and the conveyor belt 1-1, the conveyor belt 1 pulls the paper due to the pressing force of the separation belt 2. Although it rotates under the action of the washer clutch 9 due to frictional force, the separation belt 2 is pulled by the paper, and there is no gap between the swingable arm 34 and the holder 30, and the next paper is blocked. Further, when the rear end of the separated and fed paper leaves the separation belt 2, the separation bell 1 and 2 rotate to their original positions, and the leading edge of the next paper slips in and waits until the next paper is fed.

By the way, in this embodiment, the vibration absorber 6 is provided to reduce the vibration and noise caused by stick-slip etc. that occur between the paper and the separation belt 2 during paper feeding as described above. 1 to 5 diameter 16nwn, length 351
11Tl, the weight is 50 g, the contact angle of the vibration absorbing weight 5 of the vibration absorbing weight support plate 4 is approximately 140 degrees, and the support pin 7 is
The diameter of the vibration absorbing weight 5 is 4 mm, and the hole diameter of the vibration absorbing weight 5 is 4,5 nwn.
And so.

The results of examining the effects of this embodiment in which the vibration absorbing resonance 6 is formed in this manner are shown in FIG. The figure shows the results of vibration frequency analysis of the arm portion of the support fitting of the separation belt, with the vertical axis representing the vibration acceleration level and the horizontal axis representing the frequency. As is clear from the figure, this embodiment B is different from the conventional example A.
Vibration is reduced compared to In the case of this embodiment B,
This is because vibration damping occurs due to Coulomb friction between the vibration absorbing weight and the vibration absorbing weight support plate.

In this way, according to this embodiment, vibration absorption waves made up of vibration absorption weights with gaps provided in the separation belt section are provided, so vibrations caused by stick-slip caused by friction between the separation belt and the paper can be reduced, and squealing noise can be reduced. It can be prevented.

In the present embodiment, the vibration absorption waves are placed on the holder rather than on the arm, but the vibration absorption waves may be placed separately on both sides of the separation part.

〔Effect of the invention〕

As described above, the present invention reduces the vibration caused by the friction between the paper and the separation belt, and easily prevents squealing noise.
It is possible to obtain a paper separation device that can reduce vibrations caused by friction between the paper and the separation belt and easily prevent squealing noise.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view of a paper feeding device according to an embodiment of the paper separating device of the present invention, FIG. 2 is an enlarged vertical cross-sectional side view of a paper separating section of the same embodiment, and FIG. FIG. 4 is a characteristic diagram showing the relationship between frequency and vibration acceleration level of this embodiment and the conventional example. 1. Conveyance belt, 2. Separation belt, 3. Original (stacked papers), 4. Vibration absorption way 1 - support plate, 5. Vibration absorption weight, 6.. Vibration absorption wave, 7.. Support pin.

Claims (1)

[Scope of Claims] 1. The above-mentioned conveyance of the paper feeding device is provided with a rotatable conveyance belt and a separation belt disposed opposite to the conveyance belt, and the paper is conveyed one by one through between the conveyance belt and the separation belt. The belt takes out and feeds the paper below the stacked papers, and the separation belt has a function of preventing the paper from being separated.In a paper separation device of a type in which the paper is taken out sequentially from the bottom paper, the separation belt is supported. It is characterized by providing a vibration absorption benefit having a swingable vibration absorption weight support plate having a recess at a predetermined angle and a cylindrical vibration absorption weight attached to the recess of the vibration absorption weight support plate. Paper separation device. 2. Claim 1, wherein the cylindrical vibration-absorbing weight contacts the concave portion of the vibration-absorbing weight support plate at two places, and is attached by a support pin with a gap provided between the vibration-absorbing weight and the vibration-absorbing weight. Paper separation equipment as described.