JPS5890972A - Sheet feeder - Google Patents

Abstract

PURPOSE:To provide a two-bin sheet feeder capable of being easily fitted and detached, by a method wherein two roller systems are rotated by a single motor through gears provided respectively with one-way clutches, and one of the rollers is rotated by rotating the gears forwardly or reversely. CONSTITUTION:The rotation of a stepping motor 1 is transmitted to a gear 3, into which a one-way clutch 4 is press-fitted so that a shaft 5 is rotated to rotate pick-up rollers 6, 6' only when the gear 3 is rotated counterclockwise. The outside periphery of the gear 3 is meshed with an idle gear 7 to rotate a gear 9 through an idle gear 8. A one-way clutch 10 is also press fitted into the gear 9, so that a shaft 11 is rotated to rotate pick-up rollers 12, 12' when the gear 9 is rotated counterclockwise, that is, when the gear 3 is rotate clockwise. The idle gear 8, the gear 9 and the pick-up rollers 12, 12' constitute the second unit. Accordingly, a one-bin sheet feeder can be converted into a two- bin sheet feeder simply by placing the second unit on the one-bin sheet feeder and meshing the gears 7 and 8 with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet feeder and its 'd, fH1 force transmission mechanism.

A device that automatically feeds single prefecture sheets one by one to a printer is called a sheet feeder. Here, a sheet feeder that can selectively feed one type of paper sheet will be referred to as a 1-pin sheet feeder, and a sheet feeder that can selectively feed sheets of two types of glazes will be referred to as a 2-bin sheet feeder. The present invention specifically relates to this two-bin sheet feeder.

The conventional 2-bin sheet feeder has two mechanical clutches, and by attracting the magnet of either clutch, the big roller is rotated, and only one sheet of paper is sent to the rear of the platen. . in this case,
As for power, the rotational force of the platen is directly used as the rotational power of the big roller, but it has two mechanical clutches9 and is mechanically primitive.

Furthermore, the 1-bin sheet feeder and the 2-bin sheet feeder each consist of one frame, and it is not possible to upgrade the 1-bin sheet feeder to a 2-bin sheet feeder by adding parts to the 1-bin sheet feeder.

The 2-bin sheet feeder of the present invention utilizes the basic mechanism of a 1-pin sheet feeder, and adds a second hopper drive section from the rear as a unit to form a 2-bin sheet feeder. It is something to do.

This sheet feeder has a step motor as its driving source, and the rotation of the step motor is transmitted to a gear that drives the first hopper. The bearing part of the gear constitutes a one-way clutch and is located at one end of the shaft of the big roller that feeds the paper from the first hopper 1. This gear communicates with a gear that has a one-way clutch on the other bearing part, and the gear is located at one end of the shaft of the big roller that feeds the paper out of the second hopper.

The present invention uses the power of a motor to rotate two roller systems using gears each having a one-way clutch.When the motor rotates in the forward direction, one roller rotates via the clutch, and when the motor rotates in the reverse direction, the other roller rotates. The sheet feeder uses a mechanism in which the rollers rotate, and the second unit of the sheet feeder is removable.

The present invention will be explained using the drawings.

Referring to the drawings, the rotation of a step motor 1 is transmitted to a gear 3 via a timing belt 2. A one-way clutch 4 is press-fitted into the gear 3. This clutch 4 transmits rotation to the shaft 5 and rotates the pickup roller 6.6' only when the gear rotates counterclockwise when viewed from the left side of the drawing. The outer circumference of gear 3 meshes with idle gear 7,
Rotation is transmitted to gear 9 via idle gear 8. gear 9
The gear 9, to which the one-way clutch 10 is also press-fitted, transmits rotation to the shaft 11 only when the gear is turned counterclockwise. Gear 3 and gear 9 are connected through idle gear 7°8, so when gear 3 is in right turn 1, gear 9 is in right turn 9. That is, when the motor 1 is rotating in the direction of the arrow, the pickup roller 6.6' rotates, and when the motor 1 is rotating in the opposite direction to the arrow, the pickup roller 12.12' rotates.

As shown exploded at the top of the drawing, the idle gear 8, gear 91, and pick-up rollers 12 and 12' constitute one unit called a second unit, which is a separate frame from the main body unit.

The unit of the main system includes a discharge roller 21 that uses the power of the platen 16 to send out the printed paper, and a gear 18° belt 19 that transmits the power between them. It has a shaft 20. The unit of this main body system is called a 1-bin sheet feeder. At the rear of the 1-bin sheet feeder, there is an RKG for controlling the sheet feeder, although it is not shown in this figure.
owns. When a paper feed command is issued from the printer body, the step motor is rotated by the R and KG controls, and the pickup roller 6.6' is rotated.

A sheet of paper is peeled off from the hopper by a well-known method not shown in this diagram, and is fed to the rear of the platen until it is inserted into the platen.The sensor 22 confirms that it has been inserted, and the motor stop rotating. Next, L
By rotating the F motor 13, the platen 16 is rotated.
The paper is fed to the printing position. At this time, even if the rear of the paper is on the pickup roller 6.6', the shaft 5
Since a one-way clutch 4 is inserted between gear 3 and 5-, gear 3 will not rotate even if roller 6 is rotated to pull the paper.

This sheet feeder can be upgraded to a 2-bin sheet feeder by simply placing the second unit on top of the 1-bin sheet feeder and engaging gears 7 and 8. At this time, there is no need to match the gear phases, etc., and anyone can easily attach and detach the device. Furthermore, this second unit is made of only a gear roller base and does not require any external connections, making it easy to attach and detach.

As explained above, the present invention configures the feed system with the minimum necessary mechanism as a 1-bin sheet feeder, and as a second unit, the 1-bin sheet feeder has a minimum feed system in a separate frame. The advantage is that the feeder and 2-bin sheet feeder units can be shared and anyone can easily change the units.

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[Brief explanation of drawings]

The section shows one embodiment of the invention. Representative Patent Attorney Susumu Hara 7-

Claims (1)

[Claims] It is equipped with a comb roller that feeds paper, and a first and second sheet feeder system to which the roller roller is attached, and a motor for driving the first feeder system and the second feeder system is mounted in one frame. A sheet feeder characterized in that the second sheet feeder thread is attached to and detachable from the second sheet feeder thread.