JPH01263066A - Paper feed control system - Google Patents

Abstract

PURPOSE:To prevent a double feeding, by a method wherein a flexure is formed in a paper by applying a time difference larger than a time required for the paper to move from a pick roller to a feed roller to the start of the pick roller and the feed roller. CONSTITUTION:To the start of electromagnetic clutches 5b, 5c of a roller differential means 5, a time difference of (t) sec. is applied by a control means 6. The time difference t is set larger than a time required for paper to move from a pick roller 2 to a feed roller 3. In the case that the pick roller 2 feeds two or more sheets of paper 1, the time difference t allows the pick roller 2 to be kept rotating with the feed roller 3 still in a stop even when the leading edge of the fed paper 1 reaches the feed roller 3. Therefore, the paper 1 comes into a flexure state. The paper 1 is separated one by one at the leading edge thereof because of the nerve of its own. Thus, when the feed roller 3 starts rotating after the time difference (t) elapsed, one sheet of paper 1a is fed as easy as if it has been well separated beforehand.

Description

[Detailed Description of the Invention] [(Already needed)] This invention is necessary for paper to move from the pick roller to the feed roller, with the purpose of preventing double feeding, regarding a paper feed control system for sending cut sheets to printers, copiers, etc. A roller difference means is provided for applying a time difference larger than the time difference to the activation of the pick roller and the foot roller, and the sheet 1 is configured to be fed to the feed roller after the sheet 1 is bent.

[Industrial application field]

The present invention relates to a paper feeding control method for feeding caputo sheets to printers, copiers, etc., and particularly to a paper feeding control method that prevents double feeding.

[Conventional technology]

A paper feeding device that feeds cut sheets to a printer, copier, etc. generally includes a pink roller 2 that takes out paper 1 from a storage location, a feed roller 3 disposed opposite to the pink roller 2, and a feed roller 3 disposed in front of the pink roller 2, as shown in FIG. The paper 1 is pushed out by the rotation of the pick roller 2 and is gripped between the feed roller 3 and the reverse roller 4. These rollers all rotate clockwise in the figure, and even if multiple sheets of paper are taken out, the feed roller 3 feeds only the top one,
The paper on the lower side is pushed back by a reverse roller 4.

(Problems to be Solved by the Invention) The conventional method described above separates the sheets based on the difference in the friction coefficient between the sheet 1 and the pick roller 2, the friction coefficient between the sheet 1 and the feed roller 3, and the friction coefficient between the sheets 1. However, when environmental conditions such as static electricity and humidity change, the separation fails and multiple sheets of paper slip through between the feed roller 3 and reverse roller 4, as shown in Figure 6, resulting in so-called double paper separation. A feed is generated.

In recent years, the use of double-sided printing in printers and copiers has been increasing, and with this, double-feeding has become a major issue. This is because, in the case of single-sided printing, it is easy to sort out the unprinted blank paper, and you can simply throw it away.
In the case of double-sided printing, it is difficult to generate type S with only one side blank.
Moreover, there is nothing more troublesome than printing on the back side of a sheet of paper that has already had some printing left on one side.

The present invention was created in view of these circumstances, and
The purpose of the present invention is to provide a paper feed control method that can prevent double feeding with a simple device.

[Failure to solve the problem]

In the present invention, the means to solve the above problems are as follows:
As shown in the basic configuration of FIG. 1, in a paper feed control system in which a cut sheet 1 is taken out from a storage location by rotation of a pick roller 2 and fed to a required device by rotation of a feed roller 3, the sheet 1 is A roller differential means 5 is provided to apply a time difference to activation of the pick roller 2 and the feed roller 3 that is larger than the time required to move from the pick roller 2 to the feed roller 3, and feeds the paper 1 after forming a deflection. Paper feed control system for feeding the roller 3 % Type % In the figure, 4 is a reverse roller disposed opposite to the feed roller 3 and pushes back the paper 1, and 6 is a control means for setting the time difference.

[Effect]

It is difficult to completely prevent the pick roller from picking up multiple sheets of paper due to conditions such as static electricity and humidity.

In the present invention, when multiple sheets of paper are extracted, the pick roller and the pick roller are set at a time difference such that the feed roller remains stopped at that point so that the sheets are not immediately fed even when they reach the feed roller. Added to feed roller startup.

When the paper hits the stopped feed roller,
The paper is deflected by the pick roller, and the leading edge of the paper becomes loose due to its own stiffness. When the feed roller is then rotated, only the topmost sheet is fed, and the remaining separated sheets are pushed back by the reverse roller.

〔Example〕

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

FIG. 2 is a configuration diagram of an embodiment of the present invention.

In the figure, 2 is a pick roller, 3 is a feed roller, 5 is a roller differential means, and 6 is a control means. The roller differential means 5 of the present invention includes a motor 5a, a first electromagnetic clutch 5b, and a second It consists of an electromagnetic clutch 5c. The first electromagnetic clutch 5b is interposed between the motor 5a and the pick roller 2, and the second electromagnetic clutch 5c is interposed between the motor 5a and the feed roller 3 to connect and connect them.

FIG. 3 is a time chart of the operation of the above embodiment.

In the figure, the upper row shows on/off of the first electromagnetic clutch 5b, and the lower row shows on/off of the second electromagnetic clutch 5c.

As shown in the figure, a time difference of t seconds is given by the control means 6 to the activation of the two electromagnetic clutches, and the time difference is such that the paper moves from the pick roller 2 to the feed roller 3.
is set to be greater than the time required to travel to the destination.

FIG. 4 is an explanatory diagram of the operation when the time difference shown in FIG. 3 is set in the device shown in FIG. 2 and used in a paper feeding mechanism of a printer device. As shown in FIG. 5A, the pick roller 2 is first activated, and at that time, it is sufficient if the pick roller 3 sends only one sheet of TFFI 1. If two or more sheets are sent, the method of the present invention is required.

Even when the leading edge of the fed paper 1 reaches the feed roller 3, the feed roller 3 remains stopped due to the time difference, and the pick roller 2 continues to rotate. Therefore, as shown in FIG. 4(1)), the paper 1 is bent. When multiple sheets of paper are fed closely together due to static electricity, humidity, etc., the leading edge of the paper 1 becomes loose due to its own stiffness, and when the feed roller 3 starts rotating after the time difference t, It's like sending a sheet of paper that has been sorted.
One sheet of paper 1a is easily fed. When a large number of sheets lb are about to be inserted between the feed roller 3 and the reverse roller 4, they are reliably pushed back by the reverse roller 4 due to the sorting effect, as shown in FIG. 4(c).

In order to do this even more reliably, the paper 1 must be bent and
It is only necessary that the uppermost sheet of the paper sheet comes into contact with the feed roller 3 first, and one method is to provide the suction port of the feed roller 3 slightly below as shown in Fig. 1. Alternatively, a method may be adopted in which the paper is raised onto the path of the paper.

FIG. 5 is a configuration diagram showing another embodiment of the present invention.

In the figure, the roller differential means 5 of the present invention consists of two motors 5a', 5a'', the first motor 5a' drives the pick roller 2, and the second motor 5a'' drives the feed roller 3. The time difference is given to them by the control unit 6. Its timing and operation are
It is similar to that shown in FIGS. 3 and 4.

C. Effects of the Invention] As explained above, according to the present invention, even if multiple sheets of paper are fed to the feed roller, double feeding can be achieved with a simple device in which the sheets are separated by deflection and are reliably fed one by one. It is possible to provide a method for controlling feed M1 that can prevent this.

[Brief explanation of the drawing]

Fig. 1 is a basic configuration diagram of the present invention, Fig. 2 is a configuration diagram of an embodiment of the invention, Fig. 3 is a time chart of the operation of the embodiment, and Fig. 4 is an explanatory diagram of the operation of the embodiment. , FIG. 5 is a block diagram of another embodiment of the present invention, and FIG. 6 is an explanatory diagram of a conventional example. 1; Use 1; 2; Pick roller; 3; Feed roller; 4; Reverse roller; 5; Roller differential means; 5a; Motor; 5b, 5c; Electromagnetic clutch; 6; Control means. Agent Patent Attorney Makoto Igeta - (Representative) Figure 1 Figure 2 ``-1 1t: A time chart of palpitations of a million minutes Figure 3 Figure 4

Claims (1)

[Claims] In a paper feed control system in which a cut sheet (1) is taken out from a storage location by rotation of a pick roller (2) and fed to a required device by rotation of a feed roller (3), ) from the pick roller (2) to the feed roller (
A roller differential means (5) is provided to apply a time difference greater than the time required to move the paper to the pick roller (2) and the feed roller (3) to create a deflection in the paper (1). Later, the feed roller (3
).