JPH0235716Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a paper ejection device that can knock off the trailing edge of ejected paper from a paper ejection roller to accurately send the paper to a paper ejection tray.

[Conventional technology]

Generally, a paper ejecting device used in a copying machine or the like is used to eject the paper after development and fixing to the outside of the machine, and is equipped with a pair of upper and lower paper ejecting rollers. The paper ejected from this paper ejection roller is sent out while sliding on the upper surface of the paper that has been ejected before this and is stacked on the paper ejection tray. Therefore, the frictional resistance of the ejected paper makes it difficult for the ejected paper to slide, and the trailing edge of the ejected paper sometimes remains in contact with the rear surface of the lower roller without falling completely onto the ejecting tray. In such a case, the ejected sheets are stacked one after another on top of the sheets that cannot be completely removed, which may cause paper ejection failure.

As a countermeasure to the above, the applicant attempted to press down the trailing edge of the paper by attaching a flexible tongue to the spindle of the lower roller so that its free end traces a larger radius than the radius of the lower roller. .

However, in the above case, the tongue only rotates with the support shaft of the lower roller and follows the trailing edge of the paper, so the pressing force is weak.
In some cases, the trailing edge of the paper remaining in contact with the lower roller could not be knocked off, and the machine did not function satisfactorily.

[Purpose of invention]

This invention is intended to solve the above-mentioned problem, and aims to provide a paper ejection device in which the free end of the tongue-shaped piece can knock off the trailing edge of the paper ejected by the paper ejection roller.

[Structure of the idea]

To achieve the above object, this device fixes the base of a flexible tongue to the spindle of the lower roller of the paper ejection roller, and the free end of the tongue has a radius larger than the radius of the lower roller. The free end of the tongue extends in the tangential direction ahead of the fixed base, and is located above the crimping point of the paper discharge roller and within the rotation range of the free end of the tongue. A contact plate is provided that is bent in the opposite direction to the extending direction and then released, and the rotational speed of the free end of the tongue is increased by the action of the restoring force when the plate is released, and the paper is ejected from the paper ejection roller. It is constructed so that the ends can be knocked off.

〔Example〕

Next, this invention will be explained based on an embodiment shown in the accompanying drawings.

Reference numeral 1 denotes a paper ejection roller, and the paper ejection roller 1 consists of a pair of upper and lower rollers 2 and 3. The lower roller 3 is a side frame on the copying machine main body side (sometimes the side frame of the paper ejection unit).
A plurality of individual rollers are disposed at predetermined intervals on a support shaft 3a which is inserted between the rollers 4 and 4' and actively rotates by being connected to a drive system (not shown).

A belt 6 is stretched between each roller of the lower roller 3 and the belt roller shaft 5. The belt 6 is ejected through the heat roller 21 and the pressure roller 22 of the fixing section 20, and runs along the upper surface of the paper guide 23. The leading edge of the paper that is traveling along the paper is
This allows for correct introduction to the crimping point. Of course, depending on the copying machine, the delivery roller 1 may be introduced to the pressure point by means other than the belt (for example, a guide plate).

The upper roller 2 of the paper ejection roller 1 is connected to the side frame 4,
The same number of single rollers that are pressed against each single roller of the lower roller 3 are arranged on a support shaft 2a that is inserted between tilting frames 8 and 8' that are provided so as to be tiltable with respect to 4' via a shaft 7. It will be set up. The reason why the upper roller 2 is inserted between the tilting frames 8 and 8' that tilt around the shaft 7 is because the paper jams between the paper ejection rollers and between the nipping rollers of the fixing section in the preceding stage. If a problem occurs, replace upper roller 2 with lower roller 3.
This is to make it easy to release from.

Reference numeral 9 denotes a notched groove provided in the tilting frames 8, 8', and the groove 9 is provided to avoid the support shaft 3a of the lower roller 3 during tilting.

Reference numeral 10 denotes a shaft rod whose both ends are rotatably supported on the upper part of the tilting frames 8, 8', and near both ends of the shaft rod 10 there are pins 11 protruding from the inner surfaces of the side frames 4, 4'.
A locking means 12 is fixed, which engages the locking means 12. The locking means 12 has a downwardly inclined distal end surface and a pin engaging groove on the upper surface.

Reference numeral 13 denotes a handle provided at the center of the shaft 10 for releasing the locking means 12 from the pin 11. That is, by lifting and pulling the handle 13, the tilting frames 8, 8' are tilted as shown by the two-dot chain line in FIG.

Reference numeral 14 denotes a tongue-like piece made of a flexible member, and the base of the flexible tongue-like piece 14 is fixed to the support shaft 3a of the lower roller 3 of the paper ejection roller 1 via a fixing member 15. . The free end 14a of the tongue 14 extends tangentially to a radius greater than the radius of the lower roller 3 and ahead of the fixed base.

Reference numeral 16 denotes a contact plate with which the free end 14a of the tongue-like piece 14 comes into contact;
It is provided above the crimping point and within the rotation range of the tongue-shaped piece 14. The corresponding contact plate 16 is the tongue-shaped piece 14
The free end 14a of the lower roller is bent in the direction opposite to the extending direction as shown by the two-dot chain line in FIG.
It functions so that it opens all at once when the top of the door is turned.

This abutment plate 16 extends from the lower end of the wall surface of the tilting frame 8, 8' on the side of the fixing section 20 in the paper ejection direction, and enters between the single rollers of the upper roller 2 in a comb-like shape. Also serves as a paper guide plate. The reason why the abutment plate 16 is directly attached to the tilting frames 8, 8' is to enable it to be retracted from the rotation range of the tongue 14 when the tilting frames 8, 8' are tilted. That is, this is to facilitate the removal of paper jammed between the tongue and the abutting plate.

In the figure, reference numeral 17 denotes a charge eliminating bar that eliminates static electricity charged on a sheet of paper discharged by a paper discharge roller, and 18 denotes a paper discharge tray.

In the above embodiment, the tongue-like piece 14 fixed to the support shaft 3a of the lower roller 3 rotates as the lower roller 3 rotates. The free end 14a of the tongue 14 extends tangentially ahead of the fixed base with a radius larger than the radius of the lower roller 3, so that the free end 14a extends before reaching the top of its rotation range. Since it comes into contact with the contact plate 16 and is momentarily stopped, it bends in the opposite direction to the extending direction. As soon as the fixed base passes around the top of the support shaft 3a, it is opened all at once. Therefore, when the tongue is opened, in addition to the rotational speed of the support shaft, the restoring force of the free end of the tongue acts, so that the rotational speed of the free end is increased by that amount. Therefore, even if the trailing edge of the ejected paper remains in contact with the rear surface of the lower roller when it is difficult to slip due to frictional resistance with the paper stacked on the tray earlier, the trailing edge of the paper remains in contact with the rear surface of the lower roller. The paper is vigorously knocked off by the shaped pieces and is accurately fed into the paper discharge tray 18 as shown by b and a.

[Effect of idea]

As described above, this invention fixes the base of a flexible tongue to the spindle of the lower roller of the paper ejection roller, and the free end of the tongue draws a radius larger than the radius of the lower roller. The tongue extends in the tangential direction ahead of the fixed base, and is located above the pressure point of the discharge roller and within the rotation range of the free end of the tongue. A contact plate is provided that is bent in the opposite direction and then released, and the restoring force at the time of release increases the rotational speed of the free end of the tongue to hit the trailing edge of the paper discharged from the paper discharge roller. Because it is characterized by being able to be dropped, it has the excellent effect of reliably preventing paper ejection failures that occur when ejected paper does not easily slip due to frictional resistance with the paper stacked on the paper ejection tray before it. It is something that plays.

[Brief explanation of drawings]

The figures show one embodiment of this invention, in which Fig. 1 is a sectional view showing the entire paper ejection device, Fig. 2 is a front view thereof, Fig. 3 is a perspective view of the main part, and Fig. 4 is a main part of the paper discharging device. It is an action explanatory diagram. 2... Upper roller, 2a... Support shaft, 3... Lower roller, 3a... Support shaft, 14... Tongue, 14a...
Free end of the tongue, 16...Abutting plate.

Claims (1)

[Claims for Utility Model Registration] (1) The base of a flexible tongue is fixed to the spindle of the lower roller of the paper ejection roller, and the free end of the tongue has a radius larger than the radius of the lower roller. It extends in the tangential direction ahead of the fixed base,
Further, an abutment plate is provided above the pressure point of the paper ejection roller and within the rotation range of the free end of the tongue to bend the free end of the tongue in a direction opposite to the extending direction and then release the tongue. A paper ejecting device characterized in that the rotational speed of the free end of the tongue-like piece is increased by the action of the restoring force at the time of release, so that the trailing edge of the paper ejected from the paper ejecting roller can be knocked off. (2) The upper roller of the paper ejection roller is pivotally supported on a tilting frame that is tiltably supported with respect to a side frame that pivotally supports the lower roller of the paper ejection roller, and the sliding plate is attached to the tilting frame. A paper discharging device according to claim 1 of the utility model registration claim.