JPH03205238A - Medium issuing device - Google Patents

Abstract

PURPOSE:To drive out a medium in stable manner free from damage by returning the medium transported with an issued medium by a medium returning means having small transport quantity. CONSTITUTION:Media 3B are piled up in a plurality of hoppers, and a feeding roller 4B and a return roller 12B each having a fan-shaped section are installed on a same driving shaft 13B in the lower part of the hopper. A unidirectional clutch is fitted between the feeding roller 4B and the driving shaft 13B, and the feeding roller 4B can be revolved only in the (a) direction for the normal and reverse revolutions of the driving shaft 13B. The arcuate circumferential length of the feeding roller 4B is set to the length necessary for returning the transported medium 3B to the original state. The medium 3B is sent to the transport rollers by one revolution of the driving shaft 13B, and the transported medium 3B is returned to the original position by the return roller 12B by the reverse revolution of the driving shaft 13B. Accordingly, the reverse surface of the medium 3B is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a medium issuing device, and more particularly to a medium issuing device in which the structure of the rollers for separating and conveying the medium is improved.

[Prior Art] As a conventional medium publishing device of this type, for example, a technique disclosed in Japanese Unexamined Patent Application Publication No. 63-47259 is known. This technology is a device in which the media separation mechanism is configured with a gate with rubber on the surface, and it not only delivers stacked media, but also separates other (upstream) media in multiple hoppers. The conveyance of the medium fed out from the hopper was also carried out by one roller.

[Problems to be Solved by the Invention] The medium issuing device shown in the above-mentioned prior art has the advantage that the number of parts constituting the device is small, but once a single sheet of media is issued, A phenomenon occurs in which the positions of the media stacked in other hoppers passing through the media are shifted little by little, and the media are taken out in the direction of the separation mechanism. If the leading edge of this taken-out medium enters the gap between the gates of the separation mechanism section, the next medium issued from another hopper will not be able to pass through the gap, causing a problem of conveyance failure. there were.

To deal with this, it is conceivable to reversely rotate the rollers of each hopper in order to restore the removal of the stacked media from the hopper through which the media passed when issuing the media. but,
In this case, when the hopper passes through when printing media, and there is little chance of printing from the hopper itself, the surface (lower surface) of the bottom layer of the medium is rubbed many times by the roller every time it is operated. As a result, there were problems such as fuzzing of paper as a medium.

The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in the conventional technology and to prevent damage to the surface (lower surface) of the medium in a medium issuing device having a plurality of hoppers. It is an object of the present invention to provide a medium issuing device that can realize stable feeding and conveyance of medium from each hopper.

[Means for Solving the Problems] The above-mentioned object of the present invention is to provide a medium issuing device having a medium separating means and a medium feeding means, and in which a plurality of hoppers for storing stacked media are arranged in multiple stages. This is sometimes achieved by a media issuing device characterized by being provided with a media retracting means for returning the media taken out by the issued media to its original position.

[Operation] In this type of medium issuing device, the feed roller and the return roller are rotated by the rotation of the same drive shaft, and the medium is conveyed in a predetermined direction by friction between the circular arc portion of the fan-shaped cross section and the medium. In this case, the conveyance by the feed roller is the original conveyance and requires a certain conveyance force, so it is necessary that the material has high friction with the medium and has a circumferential length to feed the specified amount. It is. On the other hand, the return roller only conveys the amount of the medium taken out in the opposite direction, which is a small amount compared to the original amount of conveyance of the medium described above.

Conventionally, as mentioned above, when the drive shaft is reversed to return the taken-out medium to its original position after the medium has been issued, if the feed roller is also reversed, the arcuate circumference of the feed roller is long. Even after the ejected media returns to its original position, the feed roller continues to rotate in contact with the media, causing slippage between the media and the media.
In addition, since the friction coefficient of the feed roller is large, the media surface (
The lower surface) was to be damaged.

In the medium issuing device according to the present invention, the medium feeding means (feeding roller) is involved only in the original conveyance of the medium, and when the drive shaft is rotating in the return direction (in the reverse direction), the feeding roller does not rotate at all or rotates. Even if they do, they only come into contact with the medium for a short period of time. This ensures that when pulling back the ejected medium,
The feed roller does not damage the surface (bottom surface) of the medium.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially sectional side view of a media issuing device having a plurality of media storage hoppers, showing a first embodiment of the present invention. This embodiment shows an example in which three hoppers, IOA to 10C, are provided. In the figure, 1 is the main structure that supports the whole, 2A to 2C are L-shaped conveyance guides,
The lower horizontal portion forms a conveyance path together with the conveyance guides 9A to 9C and the main structure l. Also, 3A-3
C is inside the above-mentioned hopper IOA~IOC, conveyance guide 2A~
It shows media stacked and set on media 2C and 9A to 9C, and weights 8A to 8C are provided at the top to press media 3A to 3C downward.

At the bottom of each of the hoppers IOA to IOc, feed rollers 4A to 4C having a fan-shaped cross section and return rollers 12A to 12C having a fan-shaped cross section are connected to drive shafts 13A to 13C, as described in detail below. is installed and located. In addition, feed rollers 4A to 4C and drive shaft +3A-13c
One-way clutches 14A to 14c are fitted between the two, and one-way clutches 14A to 14c are fitted between the drive shafts +3A to 13C for forward and reverse rotation.
The feed rollers 4A to 4C are configured to be rotatable only in the forward direction (direction indicated by "A" in the figure). Note that two return rollers 12A to 12C are fixedly attached to drive shafts +3A to 13G (see FIG. 2), and two return rollers are fixedly attached to drive shafts 13A to 13c.

The detailed structure of the drive shafts 13A to 13C, feed rollers 4A to 4G, and return rollers 12A to 12C is shown in FIG. 2. The circular arc circumference of the fan-shaped cross section of the feed rollers 4A to 4C is such that the medium fed out from the hopper IOA-10c or the medium conveyed from the adjacent hopper is transferred to the conveyance roller 5A.
The length is necessary to transport up to 5C. Also,
The circular arc circumference of the fan-shaped cross section of the return rollers 12A to 12C is a length necessary to return the taken out medium, which will be described later (the length is indicated by P in FIG. 4). )
. The feed rollers 4A to 4C are made of a material with a high coefficient of friction, such as natural rubber, and the return rollers 12A to 12c are made of a material with a relatively low coefficient of friction, such as polyurethane foam. ing.

The operation of the medium issuing apparatus of this embodiment configured as described above will be described below with reference to FIGS. 1 to 4. In the following description, a case where the medium 3A in the hopper 10A is issued will be described as an example.

First, in order to feed out only one sheet of the medium 3A, the feed roller 4A and the return roller 12A rotate once in the direction indicated by the arrow "A" by one rotation of the drive shaft 13A. The medium 3A pressed from above by the weight 8A is sandwiched between the feed roller 4A and the weight 8A, and here, the friction coefficient μ1 between the feed roller 4A and the lowest medium 31A is
is the friction coefficient μ1 between the lowest medium 31A and the medium above it
Since it is configured to be larger, only the lowermost medium 31A is sent in the direction of the arrow "U".

Then, the lowermost medium 31A passes through the separation mechanism section which is operated from the first gate 6A and the second gate 7A, is further conveyed by the conveyance roller pair 5A, and enters the next hopper 1OB. In the next hopper IOB, the media 3B are stacked, but the feed roller 4B and the return roller 12B of the same hopper IOB are stopped with the fan-shaped notch above, and the lowest media 31B is stacked on the next hopper IOB. Because there is a gap between the media 31A sent from the previous hopper + OA,
Get into this gap.

Then, in the same way as in the above-mentioned feeding, the feed roller 4B and the return roller 12B make one revolution in the direction of the arrow "Aj" to feed only the medium 31A into the next hopper 10C. 3] A takes turns to use the hopper IO
B. It passes through the hopper IOC, the final conveyance path, and the issuing port (none of which are shown), and is then issued.

Here, medium-sized conveyance in which the own hopper does not issue the medium and only conveys the medium sent from the previous hopper will be explained using hopper IOB as an example.

FIG. 3 is an enlarged view of the hopper IOB.

As mentioned above, when the conveyance medium 31A is fed from the previous stage hopper, the feed roller 4B and the return roller 12B make one rotation in the direction of arrow "A", and transfer the medium to the next stage hopper IOC.
However, at this time, the lowest medium 31B of the hopper IOB and 32B and 33B above it are also conveyed to the conveyance medium 3.
Due to contact with 1A, he is slightly taken forward.

This is repeated until the medium 31B, 32B, or 33B reaches below the first gate 6B of the separation mechanism (
If the condition shown by the broken line in Fig. 3) is done, the above-mentioned conveyance gap of the medium will be blocked, which will impede the conveyance of the medium 31A conveyed from the previous stage hopper IOA, and cause conveyance defects such as jams. arise.

Therefore, in order to avoid this, as shown in Figure 4,
Every time the conveyed medium passes through the hopper IOB, the drive shaft 13B
Rotate in the opposite direction (direction "A" in the figure). As a result, the return roller 12B rotates in the direction "A" in the figure, but as described above, the one-way clutch is fitted to the feed roller 4B, so the feed roller 4B does not rotate, and the return roller 12B does not rotate.
2B (corresponding to the amount taken out as described above), the medium 31B, 32B, or 33B that has been taken out is returned to its original state.

In this case, if the amount of the medium taken out (Fig. 4P) varies and becomes less than the length corresponding to the circumference of the return roller 12B, the taken out medium 31B, 32B, or 33B is , some slip may occur after the return roller 12 is returned to its original position.
Since B is made of a material with a relatively low coefficient of friction,
Damage to the medium 31B can be prevented.

According to the above embodiment, the feed roller is involved only in the original conveyance of the medium, and does not rotate at all when the drive shaft rotates in reverse, so when the medium is pulled back, the feed roller may damage the surface (lower surface) of the medium. Never.

Next, a second embodiment of the present invention will be shown. This embodiment also relates to a medium issuing device having a plurality of medium storage hoppers, and partially sectional side views thereof are shown in FIGS. 5(a) to 5(d). In this embodiment, the drive shaft 13B is provided with a feed roller 4B similar to that shown in the previous embodiment (but without the one-way clutch 14) and a lift member 20B made of a material with a small coefficient of friction. ing.

The lift member 20B has a groove 21B that engages with a pin 22B implanted on both sides of the feed reroller 4B, and is rotatably engaged with the drive shaft 13B. Lift member 20
The outer periphery of roller B is fan-shaped and has a slightly larger diameter than the feed reroller 4B. The pin 22B and the groove 21B that engages with it
and the relationship between the feed roller 4B and the lift member 20B.
As will be described later, when the drive shaft 13B makes one rotation in the direction of arrow "A", the lift member 20B
The amount by which 1B is returned is configured to be equal to the amount taken out P described above.

Next, the operation of this embodiment will be explained.

FIG. 5(a) shows the standby state. In the same figure (b),
This shows a case where a medium is conveyed, and when the drive shaft 13B rotates in the direction of arrow "A", the feed roller 4B rotates. In this case, the lift member 20B does not rotate until the pin 22B reaches the end of the groove 21B and is positioned below, so the medium 31A contacts only the feed roller 4B and is conveyed.

When the pin 22B reaches the end of the groove 21B, the lift member 2
0B starts rotating, and with one revolution of the feed roller 4B,
The state shown in FIG. 5(C) is reached. In this state, the lift member 20B is in a state where the medium 31B is lifted. Note that during this time, the lift member 20B moves the medium 3+A
Although the lift member 20B sometimes rotates in contact with the lift member 20B and the lift member 31B, since the lift member 20B is made of a material with a small coefficient of friction, there is no effect on conveyance of the medium or damage to the surface of the medium.

Lowermost medium 31B taken out by relay conveyance of medium 31A
In order to restore the amount P taken out, rotate the drive shaft 13B in the direction of arrow "A" from the state shown in FIG.
It is necessary to set the state as shown in Figure (a). In this case, Fig. 5 (
From the state shown in c) to the state shown in FIG. There is no contact between the medium 31B and the medium 31B, and there is no pulling back action of the medium 31B and no slipping between the feed roller 4B and the medium.

After the state shown in FIG. 5(d) is reached, the feed roller 4B and the medium come into contact with each other, so that the above-mentioned take-out amount P is restored to its original value. Therefore, when the drive shaft 13B rotates in the opposite direction, that is, in the direction of the arrow "A", only a portion of the feed roller 4B having a large friction coefficient is used to restore the above-mentioned removal amount P to its original value. , the medium 31B will not slip, and the medium surface will not be damaged.

According to the above embodiment, the feed roller is involved only in the original conveyance of the medium, and only contacts the medium for a period of time when the drive shaft rotates in reverse. (lower surface) will not be damaged.

Next, a third embodiment of the present invention will be described. This embodiment also relates to a medium issuing device having a plurality of medium storage hoppers, and FIG. 6 shows a perspective view of a feed roller and a return member, which are the main parts thereof. In this embodiment, the drive shaft 13B
is provided with a feed roller 4B without the one-way clutch 14 and a lift member 20B made of a material with a small coefficient of friction, similar to that shown in the previous embodiment.

The lift member 20B has a cam 24B that engages with pins 23B implanted on both sides of the drive shaft 13B, and is rotatably engaged with the drive shaft 13B as described later. As in the previous embodiment, the outer periphery of the lift member 20B is fan-shaped with a diameter slightly larger than that of the feed reroller 4B.

The relationship between the pin 23B and the cam 24B that engages with it,
The relationship between the diameters of the feed roller 4B and the lift member 20B is the amount by which the lift member 20B returns the medium 31B when the drive shaft 13B makes one rotation in the direction of arrow "A". is configured to be equal to the above-mentioned removal amount P.

Next, the operation of this embodiment will be explained.

Figures 7 (a) to (d) show the operation during relay conveyance, and Figure 8 (
a) to (d) each show the operation when returning the amount taken out. First, the operation during relay transportation is as follows.

FIG. 7(a) shows the standby state. Figures (b) and (c) show the case where the medium is conveyed, and the drive shaft 1
When the roller 3B rotates in the direction of arrow "A", the feed roller 4B rotates. In this case, the lift member 20B is
The medium 31A does not rotate until the pin 23B engages with the cam 24B and continues to be positioned below, so the medium 31A
It is transported while contacting only B.

When the pin 23B engages with the cam 21B, the lift member 20
B starts rotating, and one rotation of the feed roller 4B brings the state shown in FIG. 7(d). In this state, the lift member 20B is in a state where the medium 31B is lifted. During this time, the lift member 20B may rotate while coming into contact with the media 31A and 31B, but since the lift member 20B is made of a material with a small coefficient of friction, there is no risk of transport of the media or damage to the media surface. There is no effect.

Next, the operation when returning the amount taken out will be explained.

Lowermost medium 31B taken out by relay conveyance of medium 31A
In order to restore the amount P that is taken out, rotate the drive shaft 13B in the direction of arrow "A" from the state shown in FIG.
It is necessary to set the state as shown in Figure (a). In this case, Fig. 7 (
From the state of d) to the state of FIG. 8(b), the medium is lifted by the lift member 20B, so even if the feed roller 4B rotates in synchronization with the drive shaft 13B, the feed roller 4B does not hold the medium. 31B, there is no pulling back action of the medium 31B and no slipping between the feeding roller 4B and the medium.

After reaching the state shown in FIG. 8(C), the feed reel roller 4B and the medium come into contact with each other, so that the above-mentioned removal amount P is restored to its original value. Therefore, when the drive shaft 13B rotates in the opposite direction, that is, in the direction of the arrow "A", only a portion of the feed roller 4B having a large friction coefficient is used to restore the above-mentioned removal amount P to its original value. , the medium 31B will not slip, and the medium surface will not be damaged.

According to the above embodiment, the feed roller is involved only in the original conveyance of the medium, and only contacts the medium for a period of time when the drive shaft rotates in reverse, so that when the medium is pulled back,
The feed roller does not damage the surface (bottom surface) of the medium.

Each of the above embodiments is shown as an example of the present invention, and the present invention should not be limited thereto.

〔Effect of the invention〕

As described in detail above, according to the present invention, in a medium issuing device having a medium separating means and a medium feeding means, and in which a plurality of hoppers for storing stacked media are arranged in multiple stages, when issuing a medium, Since a medium pulling means is provided to return the medium taken out by the issued medium to its original position, the medium can be stably fed out and conveyed from each hopper without damaging the medium surface (lower surface). This has the remarkable effect of realizing an issuing device.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a media issuing device having a plurality of media storage hoppers showing a first embodiment of the present invention, FIG. 2 is a perspective view of a feed roller and a return roller, and FIGS. The figure is an enlarged view of the hopper for explaining the operation, FIG. 5 is an explanatory diagram of the operation of the second embodiment, FIG. 7 and 8 are explanatory diagrams of the operation. 2A-2C,. 9A-9C: Conveyance guide, 3A-3C:
Medium, 4A-4C: Feed roller, loA-loC: Hopper, 12A-12c: Return roller, 13A-13C:
Drive shaft, +4A-14G: One-way clutch, 20
B: lift member, 21B=groove, 22B pin, 23B pin, 24B=cam, 31A to 31C: lowermost medium. Figure 2 Figure 5 (Part 2) (c) Figure 5 (Part 3) Part 1 (a) Figure 5 (Part 4) Figure 6 (a) (c) Figure 7 (b) ( d) No. 8 (a) F (c) F (b) F (d) 32B

Claims (1)

[Scope of Claims] 1. In a media issuing device having a media separating means and a media feeding means, and in which a plurality of hoppers for storing stacked media are arranged in multiple stages, when the media is issued, the media being taken away by the issued media. A medium issuing device characterized by being provided with a medium pulling means for returning the ejected medium to its original position. 2. The medium issuing device according to claim 1, wherein the amount of medium conveyed once in the reverse direction by the medium pulling back means is smaller than the amount of medium conveyed once in the forward direction by the medium feeding means. 3. The medium feeding means and the medium pulling back means both have a fan-shaped cross section, and one is fixed to a single drive shaft, and the other is engaged with a single drive shaft via a unidirectional rotation transmission means. 3. The medium issuing device according to claim 2, wherein: 4. The medium issuing device according to claim 3, wherein the circumferential length of the fan-shaped shape of the medium feeding means and the medium pulling back means is a dimension corresponding to the amount of medium conveyed at one time by each means. 5. The medium issuing device according to claim 3 or 4, wherein the contact surfaces with the medium of the medium feeding means and the medium pulling back means are made of materials having different coefficients of friction with the medium. 6. The medium feeding means is a roller having a fan-shaped cross-section, and the medium pulling-back means is a medium lift-up member having a fan-shaped cross-section having a radius larger than that of the medium feeding means. Media publishing device. 7. The medium lift-up member of the medium pull-back means:
It operates selectively with respect to the forward and reverse rotations of the drive shaft, and operates so as to make the contact time between the medium feeding means and the medium different between when the drive shaft rotates in the forward direction and when the drive shaft rotates in the reverse direction. 7. The medium issuing device according to claim 6. 8. The medium lift-up member of the medium pull-back means,
A selective operation of the drive shaft relative to forward and reverse rotation is realized by an engagement pin provided on the medium feeding means and an engagement groove provided on the medium pulling back means. 7. The media issuing device according to 7. 9. The medium lift-up member of the medium pull-back means,
8. The selective movement of the drive shaft between forward and reverse rotations is realized by an engagement pin provided on the drive shaft and a cam provided on the medium pull-back means. Media publishing device.