JPS6127853A - Paper feeder - Google Patents

Abstract

PURPOSE:To avoid a sheet from re-skewing by a registration roller by providing a gate at the rear of the registration roller, thereby to remove skewing of a sheet while the registration roller is retreated. CONSTITUTION:The leading end of a sheet 2 transported by a feed roller 1 passes between a registration roller 3 retained at a retreat position by retreating means and a pinch roller 3a and reaches a gate 4. The skewing of the sheet 2 is removed by bringing the leading end of the sheet 2 into contact with a click member 4b of the gate 4. After that, the registration roller 3 is lowered by the retreating means, and brought into contact with the pinch roller 3a through the sheet 2. Simultaneously, the gate 4 is rotated to release the engagement of the click member 4b with the sheet 2. Subsequently, the registration roller 3 is rotated to transport the sheet 2 in a designated timing to a recording portion (e.g. photoreceptor) without re-skewing.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a paper feeding device used in copying machines, printers, and the like.

2. Description of the Related Art Conventionally, as a paper feeding device for copying machines, printers, etc., the one shown in FIG. 3 is known. A gate c is provided between the gates b and the registration roller b side, and the leading edge of the paper d conveyed by the feed roller a hits the -H gate c to prevent the skew of the paper d ( After the skewed rollers are removed, the gate C is opened and the rollers are supplied to the registration rollers b.

Problems to be Solved by the Invention Although the paper feeding device as described above has a simple structure, the skew removed by the gate C causes the paper d to
There is a problem that reoccurs when it is added. In addition, when the gate C is opened, the stiffness of the paper d is affected.In order to make the leading edge of the paper d reach the registration roller b, the binding of the paper d into the registration roller b during typing affects the stiffness of the paper d. However, there were also problems such as not being able to obtain highly accurate tip registration.

This invention was made for the purpose of improving the above-mentioned problems.

Means and Function for Solving the Problem A gate is provided at the rear of the registration roller which can be freely retracted in the direction of separating the pinch rollers, and the skew of the paper is removed while the registration roller is retracted.

A paper feeding device that grips and conveys deskewed paper with registration rollers.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. In the drawing, 1 is a feed row 2 that conveys paper 2 fed by a paper cassette (not shown). It is made up of few things. Reference numeral 3 denotes a registration roller that regulates the conveyance timing of the paper 2, and pinch rollers 1α and 3α are provided below, respectively.
The paper 2 is brought into pressure contact with the feed row 21 and registration rollers 3 by these pinch rollers 1α and 3a. The registration roller 3 is movable up and down by a retracting means (not shown), and the registration roller 3
A gate 4 is provided behind the. The gate 4 has a claw body 4A on the circumferential surface of the row 2 part 4α that rotates intermittently in the direction of the arrow.
The skew of the paper 2 is removed in the following manner. Note that an electromagnetic renoid or the like can be used as the evacuation means.

Next, to explain the operation, the leading edge of the paper 2 conveyed by the feed roller 1 passes between the registration roller 3 and the pinch roller 3α, which are held at the retracted position by the retracting means, and reaches the gate 4. When the leading edge of the paper 2 comes into contact with the claw body 4h of the gate 4, the skew of the paper 2 is removed.

Thereafter, the registration roller 3 is lowered by the evacuation means to the position shown in FIG. 2, and at the same time the gate 4 is rotated to
Release the paper 2 from the lock. Thereafter, the registration roller 3 rotates and the paper 2 is conveyed to a recording section such as a photoreceptor with a predetermined typing. After the skew of the paper is removed by the gate, the paper is gripped by the registration rollers and the paper is conveyed, so there is no risk of re-skewing caused by the registration rollers, and the registration rollers are not locked. Since the relative position of the paper and the registration rollers is determined in the state in which the paper and the registration roller are aligned, highly accurate leading edge registration can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the same operation, and FIG. 3 is an explanatory diagram showing a conventional paper feeding device. 1 is the feed loaf s2 is the paper, 3 is the registration roller 1
3” is pinch low and 2.4 is gate. Applicant: Fuji Xerox Co., Ltd.

Claims (1)

[Claims] In a paper feeding device that includes a feed roller 1 that conveys the paper 2, a gate 4 that removes the skew of the paper 2, and a registration roller 3 that defines the feeding timing of the paper 2, the registration roller 3 is separated from the pinch roller 3α. The paper feeding device is capable of retracting in the direction in which the sheet feeder is moved, and is provided with a gate 4 behind the registration rollers 3.