JPS6351271A - Paper discharger - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a paper ejection device in an image recording apparatus such as an electronic copying machine and a printer.

2. Description of the Related Art Conventionally, there has been known a paper ejection device that ejects paper onto a paper ejection tray using a pair of paper ejection rows arranged at predetermined positions.

However, with this paper ejecting device, when ejecting a large paper after ejecting a small paper into the paper ejection tray, the leading edge of the large paper tends to get caught on the rear end of the small paper, so There is a drawback that it may not be possible to store the sheets with their leading edges aligned.

Purpose An object of the present invention is to provide a paper ejecting device that can accommodate sheets of paper with their leading edges aligned in a paper ejection tray even when ejecting a large paper after ejecting a small paper to the paper ejection tray. be.

Structure The present invention provides a horizontally moving member disposed to be movable in a substantially horizontal direction, a driving means for moving the horizontally movable member, and a driving means disposed on the horizontally movable member for temporarily moving paper being fed. A paper holding means for holding the paper, a pair of paper ejection rollers disposed on the horizontal moving member for ejecting the paper, a paper ejection roller driving means for rotating these paper ejection rollers, and a paper ejected by the paper ejection roller. and a paper discharge tray for storing paper, and the horizontally moving member is held at a standby position, and the leading edge of the paper that is sent is pinched by the paper holding means and also by a pair of paper discharge rollers. The present invention is characterized in that after the horizontally moving member is moved forward to a position corresponding to the smallest size of paper, the paper ejection roller is rotated to eject a predetermined amount of paper, and then the horizontally moving member is moved forward.

Next, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 designates a horizontally moving member that is arranged to be movable in a substantially horizontal direction.

A roller 2 is rotatably provided at the bottom of the horizontally moving member 1. These rollers 2 are mounted on rails 3 arranged substantially horizontally. A guide roller 4 is provided above the horizontally moving member 1. As shown in FIG. The guide roller 4 moves while being guided by a guide rail 5 arranged substantially horizontally.

The horizontally moving member 1 is moved substantially horizontally by a predetermined range by a driving means 6. This driving means 6 includes two pairs of pulleys 6a arranged at a predetermined interval in the horizontal direction;
6b, a step motor 6d that can rotate in forward and reverse directions and is placed near the rotating shaft 6c of one pulley 6a, and a worm gear 6f that is fixed to the drive shaft 6e of this step motor 6d, meshing with this worm gear 6f. and a gear 6g fixed to the rotating shaft 6c of the pulley 6a,
A pair of wires 6h that are attached to the pulleys 6a and 6b and to which both side plates 1a of the horizontally moving member 1 are fixed, and a guide roller 61 that guides these wires 6h.
It consists of.

The horizontally moving member 1 includes both side plates 1a and a holding plate 1b integrally fixed to these plates.

Two paper guide members 1c and 1+ (for guiding paper P sent from the image recording apparatus) are disposed on these side plates 1a and holding plate 1b.

As shown in FIGS. 2 and 3, the paper guide member 1
Two holding members 7 are provided protruding from d, and bearings 8 are provided on these holding members 7 so as to be slightly movable in the vertical direction. A rotating shaft 9a of a paper discharge roller 9 is supported by these bearings 8. This paper discharge roller 9 is movable substantially in the vertical direction. Further, a holding member 10 is protruded from the paper guide member 1d, and a spring 1 is attached to the holding member 10 to press the rotating shaft 9a of the paper ejection roller 9 upward.
1 is retained.

As shown in FIG. 3, the paper guide member 1c also has two supporting members 12 protruding from the paper guide member 1c.
is provided with a one-way clutch 13 and a bearing 14, and these one-way clutch 13 and bearing 14
A rotating shaft 15a of a paper ejecting roller 15 is supported by the rotating shaft 15a. This paper ejection roller 15 is rotated by a paper ejection roller drive means 16.

This paper discharge roller driving means 16 includes a motor 16a fixed to the holding plate 1b of the horizontally moving member 1, and a motor 16a fixed to the holding plate 1b of the horizontally moving member 1.
A pulley 16c fixed to the drive shaft 16b of
Pulley 16d fixed to a and these pulleys 16c
, and a belt 16a attached to the belts 16d. The one-way clutch 13 does not prevent the paper ejection roller 15 from rotating in the direction in which the paper P is ejected, and prevents the paper ejection roller 15 from rotating in the direction in which the paper P is ejected. do.

On the paper P insertion side of the paper ejection rollers 9 and 15.

A paper sensor 17 for detecting paper P is arranged.

This paper sensor 17 is a photosensor and is fixed to the paper guide member 1d. The roller standby position sensor 18 detects that the ejection roller 9.15 is placed at a standby position for receiving the paper P that is being sent. By detecting that the discharge rollers 9 and 15 are placed in the standby position, it is detected that the discharge rollers 9 and 15 are placed in the standby position.

A paper discharge tray 19 is arranged below the horizontally moving member 1. The smallest paper P accommodated in this paper output tray 19
The horizontally moving member 1, that is, the discharge roller 9 is placed at a position corresponding to
, 15 is arranged at a predetermined position. The roller stop position sensor 20 is composed of a photosensor, and detects that the discharge rollers 9 and 15 are placed at a predetermined position by detecting that the side plate 1a of the horizontally moving member 1 is placed at a predetermined position.

FIG. 4 shows a control device for the above-mentioned paper discharge device, which will be explained next.

The above paper sensor 17. Information such as the roller standby position sensor 18, the roller stop position sensor 20, and the power key 21 is provided to the input board of the microcomputer 22. The RAM of this microcomputer 22 is provided with a round trip flag and the like.

The output port of the microcomputer 22 is connected to a drive means 6, a paper discharge roller drive means 16, and the like.

The operation of the above-mentioned paper ejecting device will be explained based on FIG. 5. A program shown in the flowchart of FIG. 5 is stored in the ROM of the microcomputer 22.

First, in step 1, it is checked whether the power key 21 is turned on. If it is determined in step that the power key 21 is ON, initial settings are performed in step (2). In this initial setting, the RAM and input/output ports of the microcomputer 22 are cleared.

Next, in step (2), it is checked whether the paper sensor 17 is ON. If it is determined in step (2) that the paper sensor 17 is ON, the paper ejection roller driving means 16 is turned on in step (2).
N, then check whether tx≧t1 in step (9).This tx is determined by paper sensor 1 in step (■).
It is the elapsed time from the time when 7 was turned on, and t
1 is a predetermined time required for the paper discharge rollers 9 and 15 to grip the leading edge of the paper P from the time when the paper sensor 17 is turned on in step (2).

If it is determined that tx≧hi1 in the above step (2), the paper discharge roller driving means 16 is turned off in step (2), the [forward movement flag] is set to 1 in step (2), and the drive means 6 is turned on in step (l) to eject the paper. Paper rollers 9, 15 (horizontal moving member 1
), then in step (2) it is checked whether the roller stop position sensor 20 is ON. Step ■
When it is determined that the roller stop position sensor 20 is ON, the drive means 6 is turned OFF in step [phase], the [reciprocating flag] is set to 0 in step O, and the discharge roller drive means 16 is turned ON in step ■. , in step ■, ty≧
Check whether it is t2. This ty is the elapsed time from the time when the paper ejection roller drive means 16 was turned on in step (3), and tl is the elapsed time from the time when the paper ejection roller drive means 16 was turned on in step O. , is the predetermined time required to eject the smallest sheet of paper P accommodated in the paper ejection tray 19.

When it is determined that ty≧t2 in step @.

At step θ, the drive means 6 is turned on and the paper ejection roller 9.1 is turned on.
5 (horizontal moving member 1) is moved backward, and in step (2) it is checked whether the roller standby position sensor 18 is ON. If it is determined in step (2) that the roller standby position sensor 18 is ON, the driving means 6 is turned off in step (2).
In step (2), the paper ejection roller driving means 16 is turned off, and then, in step (2), it is checked whether the power key 21 is turned off. If it is determined in step (2) that the power key 21 is not OFF, the process returns to step (2). In step (2), if it is determined that the power key 21 is OFF, the operation is stopped.

In the embodiment described above, the paper holding means 2 temporarily holds the paper P when the paper ejection roller 9° 15 moves forward.
3 is configured so that the leading edge of the paper P is held between the paper ejection rollers 9 and 15 itself, but as shown in FIG. paper holding means 2 for temporarily holding the leading end of the paper P inserted into the paper P;
3 may be provided. This paper clamping means 23 includes two elastic clamping pieces 23a which are fixed to the upper surface of the paper guide member 1d and can be easily elastically deformed, and two elastic clamping pieces 23a which are fixed to the lower surface of the paper guide member 1d and which can be easily elastically deformed. It consists of two solenoids 23c that displace the elastic clamping piece 23a upward by an actuator 23b through a hole.

The elastic holding piece 23a is arranged so as to be sufficiently flexible with respect to the paper guide member 1c so as not to become an obstacle to the movement of the paper P when the solenoid 23c is OFF. When the solenoid 23c is turned on when the paper P is sandwiched between the paper discharge rollers 9 and 15 and the leading edge of the paper P reaches between the elastic clamping piece 23a and the paper guide member 1c, the actuator of the solenoid 23c is turned on. 23b is the elastic clamping piece 23
a is displaced upward, this elastic clamping piece 23a presses the paper P against the paper guide member 1c, and the paper P is held together by the paper guide member 1c.
to hold.

Effects In the paper ejecting device of the present invention, the paper ejecting roller ejects the paper while moving back from a predetermined position, so even when ejecting a large paper after ejecting a small paper to the paper ejection tray, the paper does not remain in the paper ejection tray. can be accommodated with their tips aligned.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the paper discharging device of the present invention;
FIG. 3 is a partially cutaway side view showing the main parts of the above paper ejecting device. FIG. 4 is a block diagram showing the control device of the above paper ejecting device. FIG. 5 is a flowchart for explaining the operation of the above-mentioned sheet discharge device, and FIG. 6 is a partially cutaway perspective view showing another embodiment of the paper holding means of the above-mentioned sheet discharge device. ■...Horizontal moving member, 6...Driving means, 9°15.
... Paper discharge roller, 16... Paper discharge roller driving means, 19
... Paper output tray. Figure 2 Figure 5

Claims (1)

[Claims] 1. A horizontally moving member disposed to be movable in a substantially horizontal direction, a driving means for moving this horizontally movable member, and a sheet of paper disposed on the horizontally movable member for temporarily holding the paper being fed. a clamping means, a pair of paper ejection rollers disposed on the horizontal moving member to eject the paper, a paper ejection roller drive means for rotating these paper ejection rollers, and a paper ejected by the paper ejection rollers; the horizontally movable member is placed in a standby position, and the paper clamping means clamps the leading edge of the paper that is being fed, and the pair of discharge rollers clamps the leading end of the paper, and the horizontally movable member is held in a standby position. A paper ejection device characterized in that after moving the paper forward to a position corresponding to the smallest size of paper, a paper ejection roller is rotated to eject a predetermined amount of paper, and then a horizontal moving member is moved forward.