JP2808278B2 - Paper feed control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a sheet feed control device which is fed from a cut sheet storage section to a printer, a copying machine, or the like, and which simultaneously controls a plurality of cut sheets in a stacked state. For the purpose of preventing paper feeding, that is, double feed, the cut sheet fed by the pick roller from the storage section of the stacked cut sheet is fed toward the required device by the feed roller and the reverse roller. The rotation of the feed roller and the reverse roller is controlled as described above, and when the cut sheet fed by the pick roller is double-fed, only the cut sheet on the feed roller side is supplied to the required device. The reverse cut roller paper is fed to the feed roller and the reverse throw so that the reverse roller feeds the cut paper to the pick roller side. A cut sheet fed by a pick roller from a storage section of the cut sheet reaches between a feed roller and a reverse roller, and the cut sheet is bent. Until the cut sheet is formed, the feed roller is not rotated in the cut sheet feeding direction, the pick roller is rotated in the cut sheet feeding direction, and the feed is performed after the cut sheet is bent. A roller rotation differential means for controlling the rotation of the pick roller and the feed roller is provided so that the roller is rotated in the direction of feeding the cut sheet.

[Industrial applications]

The present invention relates to a sheet feeding control device for feeding cut sheets, that is, cut sheets, from a storage unit to a printer, a copying machine, or the like, and in particular, prevents simultaneous feeding, that is, double feed, in a state where a plurality of cut sheets are stacked. The present invention relates to a paper feed control device.

[Conventional technology]

Generally, as shown in FIG. 6, a sheet feeding device for feeding cut sheets, that is, cut sheets to a printer, a copying machine, or the like, includes a pick roller 2 for feeding the cut sheets 1 from a storage unit and a cut roller 1 for the cut sheets 1. Feed roller 3 arranged behind the movement
And a reverse roller 4 opposed thereto, and the cut sheet 1 urged toward the pick roller side in the cut sheet storage section.
Is fed out by the rotation of the pick roller 2 and is eaten between the feed roller 3 and the reverse roller 4. The feed roller 3 and the reverse roller 3 are both rotating clockwise in the figure, and even if a plurality of cut sheets overlap and are eaten between the feed roller 3 and the reverse roller 4, 1 of cut paper on the feed roller 3 side
Only the sheets are fed, and the cut sheet on the reverse roller 4 side is pushed back by the reverse roller 4.

[Problems to be solved by the invention]

The above-described conventional example separates the cut sheets overlapped by the difference in the coefficient of friction between the cut sheet 1 and the pick roller 2, the coefficient of friction between the cut sheet 1 and the feed roller 3, and the coefficient of friction between the cut sheets. However, due to environmental conditions such as static electricity and humidity, separation of the overlapped cut sheets is not performed well, and as shown in FIG. 6, a plurality of cut cut sheets are moved between the feed roller 3 and the reverse roller 4. So-called double feed occurs.

In recent years, the use of double-sided printing in printers and copiers has been increasing, but double feed has become a major problem. That is, in the case of single-sided printing, unprinted cut-out paper is easy to sort out, and it is only necessary to discard it on blank paper, but in the case of double-sided printing, printing on the back of single-sided cut-out paper is omitted. Because there is no trouble.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a paper feed control device capable of preventing double feed with a simple device.

[Means for solving the problem]

In the present invention, the means for solving the above-mentioned problem is that, as shown in FIG. 1, the cut sheet 1 fed out by a pick roller 2 from a storage section of stacked cut sheets is shown in FIG. The rotation of the feed roller 3 and the reverse roller 4 is controlled by the feed roller 3 and the reverse roller 4 so as to be fed toward a required device, and the cut-sheet paper 1 fed by the pick roller 2 is doubled. When fed, feed roller 3
The feed roller 3 and the reverse roller 4 are fed so that only the cut sheet 1 on the side is fed toward the required device, and the cut sheet 1 on the reverse roller 4 side is sent to the pick roller 2 side by the reverse roller 4. A sheet feed control device for controlling rotation of the cut sheet, wherein the cut sheet fed from a storage section of the cut sheet by a pick roller is fed to a feed roller;
And reaches between the reverse roller 4 and the cut sheet 1
Until the bending is formed, the pick roller 2 is rotated in the feeding direction of the cut sheet 1 without rotating the feed roller 3 in the feeding direction of the cut sheet 1 and the cut sheet 1 is rotated. The roller rotation differential means 5 for controlling the rotation of the pick roller 2 and the feed roller 3 is provided so that the feed roller 3 is rotated in the feeding direction of the cut sheet 1 after the deflection is formed.

In the figure, reference numeral 6 denotes a control means including an MPU (microprocessor unit) for controlling the roller rotation operation means 5 for rotating the pick roller 2 and the feed roller 3 with the time difference as described above.

[Action]

In the conventional paper feed control device, it is difficult to completely prevent a plurality of pick rollers from overlapping and feeding out cut sheets due to conditions such as static electricity and humidity.

In the present invention, when a plurality of cut-out sheets 1 are fed out by the pick roller 2 so that the stacked cut-off sheets 1 reach the feed roller 3, they are not fed immediately. The time difference is given to the rotation of the pick roller 2 and the feed roller 3 so that the rotation of the pick roller 2 remains stopped.

The cut sheet 1 having a plurality of stacked sheets is fed by the feed roller while the rotation is stopped, but continues to be fed out by the pick roller 2, so that the cut sheet 1 is bent and the plurality of cut sheets are overlapped by the so-called "hip" of the cut sheet itself. The tip of 1 is in a state where it is judged.

Thereafter, when the feed roller 3 is rotated, only one of the stacked cut sheets 1 on the feed roller side is fed, and the separated cut sheets 1 are pushed back by the reverse rollers 4.

Therefore, the cut sheet separation efficiency is improved, and the skew (skewed cut sheet feeding) can be corrected.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram of one embodiment of the present invention. 1, 2 is a pick roller, 3 is a feed roller, 5
Is a roller rotation differential means, and 6 is a control means such as an MPU (microprocessor unit). The roller rotation differential means 5 comprises a motor 5a, a first electromagnetic clutch 5b and a second electromagnetic clutch 5c. The first electromagnetic clutch 5b is provided between the motor 5a and the pick roller 2;
The electromagnetic clutch 5c is provided between the motor 5a and the feed roller 3, and the operation of connecting or disconnecting the respective pick roller 2 or feed roller 3 and the motor 5a is as follows.
It is controlled by the control means 6.

FIG. 3 is an operation time chart of the embodiment.
In the figure, the upper timing chart shows ON / OFF of the first electromagnetic clutch 5b, and the lower timing chart shows ON / OFF of the second electromagnetic clutch 5c. As shown in the figure, when the two electromagnetic clutches 5b and 5c are activated, a time difference of t seconds is given to the rotation of the pick roller 2 and the feed roller 3 by the control means 6,
The time difference is set so that the feed roller 3 rotates t seconds after the cut sheet reaches the feed roller 3 from the pick roller 2.

FIG. 4 is an operation explanatory diagram in the case where the time difference shown in FIG. 3 is set in the sheet feeding control device shown in FIG. 1 and FIG. 2 and used in the sheet feeding mechanism of the printer device. As shown in FIG. 1A, first, the pick roller 2 is started to rotate. At this time, it is sufficient if the pick roller 2 only feeds out one cut sheet 1, but two or more cut sheets 1 overlap. When the sheet is fed out, the sheet feeding control device of the present invention functions.

That is, even if the leading end of the cut-out sheet 1 that has been fed in a plurality of sheets reaches the feed roller 3, the time difference t
By the second, the rotation of the feed roller 3 is still stopped, while the pick roller 2 continues to rotate. Therefore, as shown in FIG.
Is bent and is judged. When a plurality of cut sheets 1 are sent closely together due to the influence of static electricity, humidity, etc., the stacked cut sheets 1 are in a state in which the leading edge is discarded due to its own so-called "waist". When the feed roller 3 starts rotating after a time difference of t seconds, one sheet of the cut sheet 1a on the feed roller 3 side is easily sent out in the same manner as sending the cut sheet. Multi-sheet paper 1b stacked between feed roller 3 and reverse roller 4
Is inserted, as shown in FIG. 4 (c),
Due to the above-described sorting effect, the multiplied cut sheet 1b is reliably pushed back by the reverse roller 4.

In order to further ensure this, the cut sheet 1 may be surely bent so that one of the stacked cut sheets 1 on the feed roller side comes into contact with the feed roller 3 first. For this purpose, as shown in FIG. 1, a suction port for the cut sheet of the feed roller 3 may be provided slightly below, or means for raising the cut sheet 1 on the path may be provided.

FIG. 5 is a block diagram showing another embodiment of the present invention. In the figure, the roller rotation differential means 5 comprises two motors 5a ', 5a ", a first motor 5a' drives the pick roller 2 to rotate, and a second motor 5a" rotates the feed roller 3. The control means 6 applies a time difference t seconds to the rotational driving.
The timing and operation of the time difference t seconds are the same as those shown in FIGS. 3 and 4.

〔The invention's effect〕

The present invention provides the paper feed control device configured as described above, i.e., a plurality of cut-out sheets fed out by a pick roller are opposed to a reverse roller that pushes back the cut-side sheet on the reverse roller side. At this point, the feed roller stops rotating so that when the stacked cut sheet reaches the feed roller, the feed roller immediately rotates and is not fed. A time lag was given to the rotation of the pick roller and the feed roller so that they stayed, so that multiple sheets of cut paper hit the feed roller with the rotation stopped, but the pick roller continued to be fed out, so bending occurred. As a result, the so-called "waist" of the cut-sheet paper itself caused the leading edge of the stacked cut-sheet paper to be discarded. When the feed roller is rotated, only one sheet on the feed roller side of a plurality of stacked cut sheets is fed, and the remaining cut single sheet on the reverse roller side is pushed back by the reverse roller, and each sheet is securely inserted one by one. Feeding and double feed can be prevented.

That is, while the cut sheet separation efficiency is improved,
There is an advantage that the skew of the cut sheet can be corrected.

[Brief description of the drawings]

 FIG. 1 is a basic block diagram of the present invention, FIG. 2 is a block diagram of one embodiment of the present invention, FIG. 3 is a time chart of the operation of the embodiment, and FIG. FIG. 5 is a block diagram of another embodiment of the present invention, and FIG. 6 is an explanatory diagram of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Cut sheet paper 2 ... Pick roller 3 ... Feed roller 4 ... Reverse roller 5 ... Roller rotation differential means 5a ... Motor 5b, 5c ... Electromagnetic clutch 6 ... Control means

Claims (1)

(57) [Claims] 1. A feed roller and a reverse roller so that cut sheet fed by a pick roller from a storage section of stacked cut sheet is fed toward a required device by a feed roller and a reverse roller. In addition to controlling the rotation of the rollers, when the cut sheet fed by the pick roller is double-fed, only the cut sheet on the feed roller side is fed toward the required device, and the cut sheet on the reverse roller side is fed. A sheet feed control device that controls the rotation of a feed roller and a reverse roller so that the slip sheet is sent to a pick roller side by a reverse roller, wherein the cut sheet fed by a pick roller from a storage section of the cut sheet is fed. The feed roller is fed until the sheet reaches the gap between the roller and the reverse roller and the sheet is bent. Is not rotated in the cut sheet feeding direction, the pick roller is rotated in the cut sheet feeding direction, and after the cut sheet is bent, the feed roller is fed. A sheet feed control device provided with roller rotation differential means for controlling the rotation of the pick roller and the feed roller so as to rotate the pick roller and the feed roller.