JPH06425B2 - Automatic paper feeder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic sheet feeder, and more particularly to an automatic sheet feeder having an improved recording sheet loading mechanism.

[Prior Art] An automatic paper feeder for automatically feeding recording paper and originals to be copied one by one is used in various printing devices or copying devices.

Such an automatic paper feeder is provided with a dustproof cover for protecting the stored recording paper from the surrounding environment such as dust and moisture, and a paper pressing plate for pressing the recording paper and the like against the paper feeding roller. Has been.

A spring is mounted between the paper pressing plate and the automatic paper feeding device, and the paper pressing plate is constantly pressed by the spring toward the paper feeding roller.

When a bundle of recording paper or the like is loaded between the paper pressing plate and the paper feed roller by this spring, the recording paper or the like is pressed against the paper feed roller.

In a conventional automatic paper feeder having such a structure, when a bundle of recording paper or the like is newly loaded, the dustproof cover is first opened, and the paper pressing plate pressed by the spring is pushed back by hand to load the paper. The operation of loading the bundle between the paper pressing plate and the paper feeding roller is required, and the operation is extremely complicated.

Therefore, in order to eliminate this complication, the actual development of Sho 58-9
As disclosed in Japanese Patent No. 2058, there is proposed one in which a pressure plate for supporting a sheet is pushed down when a lid that opens and closes when replenishing the sheet is opened.

However, in this structure, the inward pin provided at the tip of the lever formed on the lid engages with the side end portion of the pressure plate and pushes down the pressure plate, and therefore the following problems occur. there were.

If the force of the spring that urges the pressure plate upwards is large, it must be pushed down against the large force, and a large force is applied from the pin to the side end of the pressure plate to deform the side end. There was a risk of getting stuck.

Further, if the lid is forcibly opened wide, there is a risk that the pin or lever pushing down the pressure plate may be damaged.

[Object] The present invention has been made in order to solve the above-mentioned conventional drawbacks, and provides an automatic paper feeder having a loading mechanism for recording paper or the like, which has a simple structure and is excellent in operability. It is an object.

[Examples] Hereinafter, details of the present invention will be described based on Examples shown in the drawings.

FIG. 1 and the following figures are for explaining one embodiment of the present invention. In the drawing, an automatic sheet feeder indicated by reference numeral 1 as a whole is formed in a flat casing shape, and a back plate 4 is provided in the middle thereof. A bent portion in the middle of the paper pressing plate 8 is fitted through the formed opening 6.

As shown in FIG. 3, the paper pressing plate 8 is formed with a bent portion 10 bent at a right angle in the middle thereof.
The upper half 12 above 0 is on the back surface of the back plate 4, and the lower half 14
Is arranged on the upper surface of the back plate 4, and the bent portion 10 is provided with the opening 6
It is fitted inside.

A spring 16 is mounted between the lower half of the paper push plate 8 and the back plate 4, and the spring 16 allows the paper push plate 8 to rotate freely on a shaft 22a horizontally mounted in the automatic paper feeder. It is pressed against the side of the supported sheet feed roller 22.

This paper pressing plate 8 is usually a lower half 1 as shown by the solid line in FIG.
4 is pushed upwards.

On the other hand, a release cam 18 is rotatably supported by a shaft 20 on the back side of the back plate 4.

The release cam 18 is a position control means for the paper pressing plate 8 and has, for example, a semicircular shape.

As will be described later, cams, which are means for controlling the position of side edges of recording paper, etc., are provided at both ends of the shaft 20, and a dustproof cover 2 constituting the upper half of the automatic paper feeder is rotatable about the shaft 20. It is supported by.

On the other hand, as shown in FIGS. 2 and 4, a fixing member 3 is attached midway along the side edge of the automatic paper feeder.

A projecting piece 5 is projectingly provided on a part of the fixing member 3, and a rotating member 9 is rotatably supported by the projecting piece 5 via a shaft 7.

As shown in FIG. 5, the rotating member 9 has a protruding piece 9 in the middle thereof.
a, and is rotatably connected to the projecting piece 5 via the projecting piece 9a via a shaft 7.

Further, a hook 11 is bent and provided at the lower end of the rotating member 9, and a side presser 13 is mounted between the hook 11 and the lower end of the fixing member 3.

The side presser 13 is pressed by a spring 15 mounted elastically between the side presser 13 and the fixed portion of the automatic paper feeder.

The upper end of the rotating member 9 is in contact with the cam surface 19 of the cam 17, and the cam 17 is fixed to the dust cover 2.

That is, a cam 17 is fixed to at least one arm 2a side of the dustproof cover 2 as shown in an enlarged view in FIGS. 7 and 8.

The cam 17 may be provided integrally with the arm 2a or may be separately formed.

The cam 17 is formed with a cam surface 17a extending over more than half the circumference of the side surface of the cam 17. The cam surface 17a is located at a position closer to the dust cover 2 as shown in FIG.
And has a highest part 17c at a position away from the dust cover 2.

Then, as shown in FIGS. 7 and 8, one end of the rotating member 9 is in contact with the cam surface 17a.

Further, the release cam 18 is fixed in the middle of a shaft 20 which rotatably supports the arm 2a via a cam 17 (see FIG. 9).

Therefore, when the dust cover 2 is rotated, the rotating member 9 is rotated via the cam 17.

Recording paper 24 is stacked on the upper side of the back plate 4 and the paper pressing plate 8 of the automatic paper feeder 1. The lower end of the recording paper 24 is supported by a separation claw 26 and is fed by a paper feed roller 22.
The recording paper 24 sent out one by one is the main body 3 such as a recording device.
Paper feed roller 36 and pinch roller 38 provided on the 0 side
The sheet is guided through the sheet feeding port 32 and is discharged from the sheet discharging port 34 by the sheet discharging roller 28.

It is to be noted that the reference numeral 40 in FIG.
The guide member, indicated by reference numeral 41, is a side plate.

Further, the reference numeral 21 in FIG. 4 is a hook projecting on the fixing member 3 side.

Next, the operation of this embodiment configured as described above will be described.

In the normal state, the paper pressing plate 8 is in the position shown by the solid line in FIG. 3, and at this time the side presser 13 is pressed by the spring 15 as shown in FIG. 4, and when the recording paper is not loaded, Is in a state of slightly protruding inward from the fixing member 3, as shown in FIG.

When it is desired to load a recording sheet, the dustproof cover 2 is rotated counterclockwise in FIG. 1 about the shaft 20 to open the upper end portion of the automatic sheet feeder greatly.

At this time, the release cam 18 also rotates, and the cam surface thereof causes the paper pressing plate 8 to rotate as a whole in the counterclockwise direction as shown by the chain line in FIG.

As a result, the lower half portion 14 of the paper pressing plate 8 is separated from the paper feed roller 22, a space is formed between the paper feed roller 22 and the paper feed plate 22, and a stack of recording papers can be loaded.

Along with the rotation of the dustproof cover 2, the cam 17 integrated with the dustproof cover 2 also rotates and the cam surface 19 pushes the rotation member 9, so that the rotation member 9
Is rotated counterclockwise about the shaft 7 as shown in FIG.

At this time, the upper end of the side retainer 13 engaged with the hook 11 of the rotating member 9 overcomes the force of the spring 15 and is pushed to the right in FIG.

As a result, the side presser 13 is moved to the outside of the fixing member 3, and the side presser does not interfere when the recording paper is loaded.

When the loading of the recording paper 24 is completed, the dustproof cover 2 is returned to its original position and closed. In this state, the force of the spring 16 provided below the lower half portion 14 of the paper push plate 8 causes the paper push plate to be pressed. 8 is pressed, and the recording paper 24 is pressed against the paper feed roller 22.

Further, when the dustproof cover 2 is closed, the pressing force applied to the rotating member 9 by the cam 17 is released, so that the side presser 13 returns to its original state by the force of the spring 15 and the recording paper 24 surely has its side edges. You can hold it down.

In this state, the sheet feeding roller 2 is driven by a driving unit (not shown).
2 and the like are driven, and the recording sheets are supplied one by one to the apparatus side.

As described above, the automatic paper feeder according to the present invention can interlock with the operation of the dustproof cover to allow the paper pressing plate and the side presser to escape to a position where they do not interfere with the loading of recording paper and the like. The troublesomeness such as pressing by hand is eliminated, and the operability is remarkably improved.

[Effect] As is apparent from the above description, according to the present invention, the release cam for separating the sheet pressing plate from the sheet feeding means by the opening operation of the cover is formed by cutting out a part of the cylindrical outer peripheral surface. A shape having a circular arc portion and a cutout portion, and
Since the center line of the arc portion can be rotated, and the arc portion of the release cam presses the sheet pressing plate to separate it from the sheet feeding means, the sheet pressing plate always has a constant amount regardless of the opening / closing angle of the cover. Since it can be pushed down, it will not be damaged even if the cover is opened wide forcibly.

[Brief description of drawings]

FIG. 1 illustrates an embodiment of the present invention. FIG. 1 is a vertical side view, FIG. 2 is a plan view with a cover removed, FIG. 3 is an operation explanatory view of a paper pressing plate, and FIG. FIG. 5 is a plan view of the rotary member, FIG. 6 is a plan view illustrating the operation of the side presser, and FIGS. 7 and 8 are perspective views illustrating the shape and operation of the cam. 9 is a perspective view of the dustproof cover. DESCRIPTION OF SYMBOLS 1 ... Automatic paper feeder 2 ... Dustproof cover 3 ... Fixing member 4 ... Back plate 8 ... Paper pressing plate 9 ... Rotating member 11 ... Hook 13 ... Side pressing 17 ... Cam 18 ... Release cam (pressing plate releasing means)

Claims (1)

[Claims] 1. An automatic sheet feeding device, which is provided so as to be inclined upward with respect to a recording means, and which feeds a sheet to the recording means, and a swingable sheet pressing plate for supporting the sheet. Sheet feeding means for feeding the sheet supported by the sheet pushing plate, biasing means for pushing the sheet pushing plate toward the sheet feeding means, and an upper end for loading the sheet on the sheet pushing plate A cover that is rotatably supported so as to open at the side of the cover, and a cover that is disposed on the rotation shaft of the cover and that interlocks with the opening operation of the cover to prevent the sheet pressing plate from resisting the biasing force of the biasing means. A pressing plate releasing means for separating from the paper feeding means, wherein the pressing plate releasing means has a shape having an arc portion and a notched portion formed by partially cutting out a cylindrical outer peripheral surface, In addition, it is possible to rotate around the center line of the arc portion as an axis. It is a scum, and when the sheet is fed, the cutout portion of the release cam is opposed to the sheet push plate so as not to act, and at the time of replenishing the sheet, the release cam is rotated by the opening operation of the cover to form an arc portion. An automatic sheet feeding device, characterized in that the sheet pushing plate side is pushed to be separated from the sheet feeding means.