JPS6332692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet guiding device for guiding a sheet being conveyed in a copying machine, etc., and in particular, it is capable of stably conveying the sheet by reducing the influence of air resistance etc. on the sheet during sheet conveyance. The present invention relates to a sheet guiding device.

Conventionally, in this type of sheet guiding device, for example, in order to adjust the timing of a conveyed sheet, it is possible to hit a registration means such as a register roller and stop the sheet, form a loop in the sheet, and then convey the sheet again. As such, a wide space is formed in the sheet guide member immediately in front of the registration means. However, since this space formed by the guide plate is usually filled with air, the seat must form a loop against the air resistance. This has the disadvantage that a loop is not formed and the sheet bends and is pressed against it, causing a jam or a timing shift.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a new sheet guiding device that improves these drawbacks.

Another object of the present invention is to provide a sheet guiding device with good air permeability so that the sheet is not subjected to air resistance.

That is, the main structure of the present invention that can achieve the above object is a registration means that is provided downstream of the sheet conveying means for conveying the sheet and temporarily locks the leading edge of the sheet to form a loop in the sheet. In a sheet guide device equipped with a conveyance guide plate that guides a sheet, an opening that allows air to circulate in a space between the conveyed sheet and the conveyance guide plate when forming a loop in the sheet is provided in the conveyance guide. This sheet guiding device is characterized by being formed into a plate.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

A document 1 is placed on a document table glass 2 constituting a document placement surface on the top surface of the machine case. lighting lamp 3,
It consists of a first mirror 4 that moves together with this mirror, a second mirror 5 that moves in the same direction at half the moving speed of this first mirror 4, a switching mirror 6, a lens 7, and a fixed mirror 8. The optical system performs slit exposure, and the image is formed onto the drum 9.

The surface of the drum 9 is a photosensitive surface, and is charged by a charger 10. Subsequently, when reaching the exposure section 11, the photoreceptor is exposed to the original image and at the same time is subjected to static elimination by the static eliminator 12.

Next, an electrostatic latent image is formed on the surface of the drum (photoreceptor) by full exposure by the full surface exposure lamp 13 and enters the developing device 14 .

Development is performed by a developing roller 15. Thereafter, the post charger 16 squeezes out the surplus developer.

Next, the image on the drum 9 is transferred by the transfer charger 17 onto the copy paper 20 sent out from the feeding section 18 or 19. After the copy paper has been transferred, it is separated from the drum 9 in the separating section 21 and transferred to the fixing section 22.
After being guided and fixed, the paper is discharged onto a tray 24 by a discharge roller 23. On the other hand, the remaining toner on the drum is cleaned by the blade 25 pressed against the drum surface (photosensitive surface), and the next cycle can be repeated again.

When copying a thick original, the switching mirror 6 is in the state shown by the two-dot chain line. When the switching mirror 6 is moved to the solid line position and the movable mirrors 4 and 5 are moved to the right end (solid line position), the automatic sheet document feeder 2
6 can be adopted. In this case, the exposure section 30
The document passing through is illuminated by a lamp 3, and its image is formed on a drum 9 by a switching mirror 6, a lens 7, and a fixed mirror 8. This lamp 3 is the same lamp used for thick originals (described later). The sheet original 28 stacked on the original stacking table 27 of the automatic sheet original feeder 26 is separated into a topmost sheet by a separation roller 29, and then transferred to a series of feed rollers 31, 3.
2, 33, and 34, the document is conveyed to the document tray 35 through the exposure section 30, and is discharged.

1 and 2, FIG. 1 shows a state in which either the main cassette 73 or the sub-cassette 74 is used. By switching the button, it is possible to select which paper feed roller 53, upper or lower, is to act.

FIG. 2 shows a state in which a manual cassette 75 is used. The cassette receiver 77 is pivotally connected to a shaft 79 fixed to the main body. The manual cassette 75 is slidably attached to a cassette receiver 77, and one end of the manual cassette 75 is fixed to a shaft 79 which is supported by a link 78 on the main body. The shaft 79 can be swung by a motor, and its position can be selected by switching a button.

Details of the paper feeding section will be explained with reference to FIGS. 3, 4, 5, and 6. The paper feed roller 53 is fixed to its shaft 54, and the shaft is supported by an arm 55. A rotation shaft 56 is fixed to this arm 55.
is pivoted on the main body frame. Therefore, the paper feed roller 53 can swing around the shaft 56. A spring 57 is applied to the arm 55 and pulled upward. The shaft 54 has a follower roller 58 which operates as a follower of the cam 59. The cam 59 is controlled by a one-turn clutch with a temporary stop. This will be explained in FIGS. 5 and 6. The cam shaft 60 passes through the frame 61,
It is supported by this. The input to this camshaft is input from the motor to the pulley 63 via the belt 62. A spring clutch consisting of a clutch drum 64, a clutch spring 65, and a stop ring 66 fixed to the body ₆₃₁ of the pulley 63 and the shaft 60 is controlled by a solenoid 67. If the solenoid 67 is not suctioning, move the lever 68 to the position shown by the solid line in Figure 5.
is located, and one of the protrusions ₆₆₁ of the stop ring 66 is engaged with the lever 68, thereby disengaging the clutch. When the solenoid 67 is attracted, the lever 68 comes to a position 68' shown by a dashed line, and the lever 68 is disengaged from the protrusion ₆₆₁ , the clutch is engaged, and the cam 59 is rotated. However, when rotated approximately 180 degrees, another protrusion 6
6 ₂ and lever 68' engage, and the clutch is disengaged again. At this time, the paper feed roller 53 is pushed down by the cam 59 and is at the position indicated by the dashed line 53' in FIG.

When the pressed down state is reached, the friction pulley 69 (Fig. 4) fixed to one end of the paper feed roller shaft 54 and the constantly driven capstan 70 (Figs. 3 and 4) come into contact with each other to feed the paper. The roller 53 will be driven.

When the suction of the solenoid 67 is released, the protrusion 66
₂ disengages from the lever 68', the clutch becomes engaged again and rotates about 180 degrees, returning to the state shown in FIG. 5 again, and the clutch becomes disengaged. The clutch spring 65 has one end hooked to the stop ring 66 and the other end hooked to the clutch drum 64, and the stop spring 65 is hooked to the clutch drum 64 by repeating the clutch operation.
The relative relationship between the protrusions 66 ₁ and 66 ₂ of No. 6 and the cam 59 does not shift.

The direction in which the paper is ejected from the cassette is
Due to the stiffness of the paper, its own weight, etc., it is fed as shown by the two-dot chain line P in Figure 3, but it is hit by a register roller 52 (which is stopped at this time) to ensure accurate timing with the machine. , P', the register roller 52 starts rotating and sends out the next one. If we continue with this traditional method,
There were times when I couldn't do loops like P' properly and jammed. If you observe this carefully, you will see that the loop is reversed as shown by P'', and a paper jam occurs between the cassette and the guide plate 71. This is because when the paper condition changes from P to P', the paper The space between the guide plate 71 and the guide plate 71 expands rapidly, and if air is not properly replenished into this area, atmospheric pressure will cause
It turns out that the paper remains pressed at position P and becomes like this. Therefore, as shown in FIG. 7, a large number of holes 71 ₁ and 72 ₁ for ventilation are opened in the guide plates 71 and 72 (guide plates of the lower feeding section). As a result of this treatment, the troubles indicated by P'' were completely eliminated.
In FIG. 7, the long holes are widened toward the end to prevent the paper from getting stuck, but the same effect can be obtained by providing a large number of round holes.

As explained above, according to the present invention, when the sheet forms a loop in the register means, it is not subjected to air resistance, so even a sheet with weak elasticity can form an appropriate loop, and jams and timing deviations can be prevented. , stable and reliable sheet conveyance guidance is possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a copying machine to which the present invention is applied, Fig. 2 is a sectional view showing manual paper feeding, Fig. 3 is a sectional view showing details of the paper feeding section, and Fig. 4 is a sectional view of the copying machine. FIG. 5 is a perspective view showing a paper feed timing control mechanism, FIG. 6 is a sectional view thereof, and FIG. 7 is a perspective view showing a copy paper guide member. 3... Illumination lamp, 4... First mirror, 5... Second mirror, 7... Lens, 18... Feeding section (upper), 19...
Feeding section (lower), 27...transfer document (sheet document) loading table, 36, 44...support member, 64...clutch drum, 65...clutch spring, 66...stop spring, 66 ₁ , 66 ₂ ...protrusion, 71, 72 ...Guide board.

Claims (1)

[Scope of Claims] 1. A conveyance guide that is provided on the downstream side of the sheet conveyance means that conveys the sheet and guides the sheet to registration means that temporarily locks the leading edge of the sheet and forms a loop in the sheet. A sheet guiding device equipped with a plate, characterized in that the conveying guide plate has an opening that allows air to circulate between the sheet conveyed when forming a loop in the sheet and the conveying guide plate. Seat guiding device.