JPS6341380Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a media separation mechanism for separating and sending out one by one a large number of sheets of media such as paper accumulated in a hopper.

[Prior art]

FIG. 1 is a side view showing a conventional media separation mechanism of this type. In the figure, 1 is a suction drum, which has a suction port 2 at a predetermined position on the outer circumferential surface, and a suction pipe runs from the suction port 2 to the center. 3 is formed. This suction drum 1 has a medium 4 such as paper inside.
The hopper 5 is located above one end of the hopper 5 on which a large number of media 4 have been deposited, and the hopper 5 is removably set in the position shown in the figure, and in this set state, one end of the topmost medium 4 is is controlled so that it is in contact with the outer peripheral surface of the suction drum 1.

Reference numeral 6 denotes a reset lever disposed on the side of the suction drum 1, which stands by at a position away from the medium 4 as shown by the solid line when feeding the medium 4, and when feeding is finished as shown by the dashed line. It is adapted to be moved to a position where it presses the medium 4 by means not shown.

A conveyance roller 7 is pivotally supported by one end of a rotatable arm 8, and is brought into contact with the outer peripheral surface of the suction drum 1 at a predetermined position by a spring 9 that tensions the arm 8.

Reference numeral 10 denotes an endless separation belt, which is made of a material with a high friction coefficient, such as silicone rubber, and is attached to a roller 11 and a support frame 13 that is rotatable about an axis 12 of the roller 11. It is supported by being wrapped around a small roller 14. The separation belt 10 is disposed near one end of the hopper 5 on the exit side, and is pressed against the outer periphery of the suction drum 1 with a predetermined pressure by a spring 15 that tensions the support frame 13.

Reference numeral 16 denotes a guide member, which is made of a material with a small friction coefficient such as Delrin, Teflon, etc., and is used to guide the separation belt 1 as shown in FIG.
The tip 17 in contact with 0 is shaped like a curved tongue and has a smooth surface. This guide member 16
is attached to the end of the support frame 13 so as to surround a part of the separation belt 10 on the hopper side, and a part thereof is in contact with the outer peripheral surface of the suction drum 1.

FIG. 3 is a front view showing the positional relationship of the main components in FIG. 1. Here, in order to make the shape and arrangement easier to see, the contact point between the suction drum 1 and the separation belt 10 is shown from the position shown in FIG. 1. The state in which the separation belt 10 side is rotated approximately 90 degrees clockwise around the center and unfolded is shown.

Next, the operation of the above-mentioned configuration will be explained. In the state shown in FIG. , the suction drum 1 is controlled so that the medium 4 is suctioned and held in the direction of arrow b by the suction port 2. Here, the number of media 4 that is suctioned and held by the suction drum 1 during suction is not limited to one, but two or more media 4 may be suctioned and held. Therefore, multiple feeding in which two or more media 4 are sent out at the same time is possible. Occur.

The separation belt 10 prevents this multiple feeding and functions to separate the second and subsequent media 4. Normally, this separation belt 10 can separate the media 4 one by one even if it is stopped against the suction drum 1, but if the same part is always in pressure contact with the suction drum 1, wear will occur. Therefore, the roller 11 is moved by a means (not shown) connected to the shaft 12.
It is designed to rotate at a speed slower than the rotational speed of the suction drum 1 in a direction opposite to the rotational direction of the suction drum 1, that is, in the direction of arrow c, to reduce wear.

In this way, the separation belt 10 removes the medium 4 from the medium 4.
The medium 4 is separated one by one, and only the medium 4 that is in contact with the suction drum 1 is conveyed to a conveyance roller 7 by the rotation of the suction drum 1, and further conveyed by this conveyance roller 7 to the next step (not shown).

Note that the rotation of the separation belt 10 in the direction of the arrow c described above also functions to return unnecessary media 4 into the hopper 5 after delivering a predetermined number of media 4.

Having explained the conventional media separation mechanism above,
According to this report, because the separation belt is in pressure contact with the suction drum and rotates in the opposite direction to the rotation direction of the suction drum, the separation belt has the disadvantage that it is easily worn out and its operation is unstable. There were flaws.

In addition, a guide member is attached to a rotatable support frame to guide the leading edge of the medium in the traveling direction so that it is not damaged or scratched. If the media rotates counterclockwise around the shaft, the media will directly collide with the separation belt at an acute angle, potentially damaging or damaging the leading edge of the media.Furthermore, the separation belt may also be damaged or damaged by the rotation of the suction drum. Since the separation function may become unstable, multiple feeds may occur, and the intended purpose cannot be achieved continuously.

[Purpose of invention]

The present invention has been made to solve the above-mentioned drawbacks of the conventional technology, and can reduce the wear of the separation belt and stabilize the operation.
It is an object of the present invention to realize a medium separation mechanism that does not damage or damage the leading edge of the medium and can reliably prevent multiple feeding of the medium.

[Structure of the idea]

In order to achieve the above-mentioned object, the present invention provides a rotatable reverse drum coaxially with the suction drum and having approximately the same outer diameter as the suction drum, and presses the separation belt against the reverse drum.
When two or more media are fed out from the hopper, the other media except for the one in direct contact with the suction drum are returned in the opposite direction to the rotation direction of the suction drum by the rotation of the reverse drum and separation belt. This is what I did.

〔Example〕

The following description will be made with reference to the drawings. FIG. 4 is a side view showing an embodiment of the media separation mechanism according to the present invention;
FIG. 5 is a partially sectional front view showing the positional relationship of the main components in FIG. 4.

In the figure, reference numeral 18 denotes a suction drum corresponding to 1 in the conventional device, which has a suction port 19 at a predetermined position on its outer peripheral surface, a suction pipe 20 is formed from this suction port 19 to the center, and has a suction drum on one side. It has a structure in which a boss portion 21 is formed in the center portion. The suction drum 18 is fixed to a pipe shaft 22 that passes through its center, and is rotated by the pipe shaft 22 in the direction of arrow a. This allows the suction port 2 to suck and hold the medium 4.

A reverse drum 23 is made of a material with a relatively low coefficient of friction and a smooth surface, such as polyacetal resin, and has approximately the same outer diameter as the suction drum 18 . This reverse drum 2
3 is rotatably fitted on the outer periphery of the boss portion 21 so as to be adjacent to the suction drum 18, and is prevented from falling off from the boss portion 21 by a retaining member 24.

4 is a medium, 5 is a hopper that holds a large number of sheets of the medium 4, 6 is a reset lever, 7 is a conveyance roller,
8 is an arm, 9 is a spring, 10 is a separation belt, 11 is a roller, 12 is an axis of the roller 11, 1
3 is a support frame, 14 is a small roller, 15 is a spring for pressure contact, 16 is a guide member, and 17 is a curved tongue-shaped tip of the guide member 16, which are shown in FIGS. 1 to 3. However, in this embodiment, the surfaces of the separation belt 10 and the guide member 16, which are wound around and supported by the roller 11 and the small roller 14, are held in a predetermined position by the pressure spring 15. It is brought into pressure contact with the outer peripheral surface of the reverse drum 23, and is different from conventional devices in this point.

Since the separation belt 10 is in pressure contact with the outer peripheral surface of the reverse drum 23 in this way, when the medium 4 is not present between the suction drum 18 and the separation belt 10, this separation belt rotates in the direction of arrow c. The belt 10 can rotate in the direction of arrow d, that is, in the opposite direction to the rotation direction of the suction drum 18.

In this configuration, the medium 4 deposited in the hopper 5 is transferred to the suction port 19 by the negative pressure applied to the suction line 20 of the suction drum 18 via the pipe shaft 22.
The medium 4 thus suctioned and held is sent out from the hopper 5 as the suction drum 18 rotates in the direction of arrow a.

As described above, the reverse drum 23 according to the present invention is rotatably attached to the boss portion 21 of the suction drum 18, that is, it is rotatably attached coaxially with the suction drum 18, and the reverse drum 23 is rotatably attached to the boss portion 21 of the suction drum 18.
Since the separation belt 10 is pressed against the outer peripheral surface of the separation belt 3, its movement is dominated by the movement of the separation belt 10, which has a large coefficient of friction.

That is, when the medium 4 is sucked and sent out, if only one sheet of the medium 4 deposited on the hopper 5 is suctioned by the suction port 19 of the suction drum 18, the medium 4 is It is attracted to the suction drum 18, overcomes the frictional resistance with the separation belt 10, and moves the conveyance roller 7 and the suction drum 1.
It is conveyed until it is clamped by 8, and from there it is sent out to the next process (not shown). In other words, the suction pressure applied to the medium 4 by the suction drum 18 is
The pressure is set to be sufficiently higher than the frictional force between the paper and the separation belt 10, for example, about 650 mmHq when the medium 4 is plain paper.

On the other hand, if the medium 4 is sent multiple times, for example 2
When two sheets of media 4 are fed onto the separation belt 10, the one sheet that is in direct contact with the suction drum 18 is attracted to the suction drum 18 by the same suction pressure as described above, but the one sheet that is in direct contact with the separation belt 10 is The suction force of the suction port 19 hardly acts on the other one, and only the medium 4
Since the particles are only fed onto the separation belt 10 by the frictional force between them, they are returned onto the hopper 5 as the separation belt 10, which has a larger frictional force, rotates. The same applies to the case where three or more media 4 are fed multiple times.

Here, according to the conventional device, the separation belt 10
Since the contact pressure was received by the suction drum, in order to increase the frictional force of the separation belt 10, it is necessary to increase the tensile force of the pressure contact spring 15, and by doing so, the separation belt 10 is reversed. This results in the separating belt 10 being pulled by the suction drum 18 rotating in the direction, and causing the separating belt 10 to break, or even causing the multiple-fed media 4 to be sent as is to the next process.

However, in the present invention, the reverse drum 23 that receives the reaction force of the separation belt 10 is rotatably provided coaxially with and adjacent to the suction drum 18.
In addition, since the reverse drum 23 has a small coefficient of friction and a smooth surface, the unstable operation described above is eliminated, and stable separation feeding is possible without multiple feeding and without damaging the medium 4. becomes.

When the medium 4 is separated one by one in this way and a predetermined number of sheets are sent out from the hopper 5, the suction drum 1
8 is stopped, and at this time the separation belt 10
The medium 4 held between the reverse drum 23 is
By rotating the separating belt 10 in the direction of arrow c, it is sent backward, and its leading end is returned onto the guide member 16.

As described above, this guide member 16 is made of a material with a small coefficient of friction and a smooth surface, so when the reset lever 6 returns from the position shown by the solid line to the position shown by the broken line, the reset lever 6 causes the guide member 16 and the reverse drum to When the tip of the medium 4 held between the guide member 23 and the guide member 23 is pushed, the medium 4 easily slides down from the guide member 16 and returns into the hopper 5. Therefore, even when returning the medium 4,
Do not damage its tip.

In addition, in order to prevent the medium 4 from being skewed, a separating belt 10, a suction drum 18, and a reverse drum 23 are installed.
It is desirable to provide one set of each set symmetrically on the left and right sides.

[Effect of idea]

As explained above, the present invention has a reverse drum made of a material with a small coefficient of friction and a smooth surface, which is rotatably installed coaxially and adjacent to the suction drum that delivers the medium. Since the separation belt that rotates in the opposite direction to the suction drum is in pressure contact with the outer circumferential surface, the wear of the separation belt is reduced compared to conventional methods, and the leading edge of the medium is not damaged when the medium is sent out or returned. There is an effect that the media can be reliably and stably separated and sent out one by one without being damaged.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional media separation mechanism, FIG. 2 is a partially cutaway perspective view showing the shape of its guide member, and FIG. 3 is a front view showing the positional relationship of the main components in FIG. 1. FIG. 4 is a side view showing one embodiment of the media separation mechanism according to the present invention, and FIG. 5 is a partially sectional front view showing the positional relationship of its main components. 4... Medium, 5... Hopper, 10... Separation belt, 11... Roller, 12... Shaft, 13... Support frame, 14... Small roller, 15... Pressing spring, 16... Guide Member, 18... Suction drum, 19... Suction port, 21... Boss portion, 22
...Pipe shaft, 23...Reverse drum.

Claims (1)

[Scope of utility model registration request] The hopper has a hopper on which a large number of media such as papers are piled up, and a suction port for suctioning and holding the media, and is located above one end of the hopper and rotates the medium suctioned and held by the suction port in a predetermined direction. A media separation mechanism comprising a suction drum for feeding out, and a separating belt for rotating in a direction opposite to the rotational direction of the suction drum to separate the media so that the media are sent out one by one, wherein the suction drum and A reverse drum having approximately the same outer diameter is rotatably provided coaxially with and adjacent to the suction drum, and the separation belt is brought into pressure contact with the outer peripheral surface of the reverse drum, so that two or more media are fed out from the hopper. 2. A media separation mechanism characterized in that when the media is removed, the media other than one in direct contact with the suction drum are returned in a direction opposite to the rotational direction of the suction drum.