JPS6320672Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet discharging device for a copying machine that discharges sheets to a plurality of stockers provided in the copying machine.

Conventionally, as a sheet ejection device in a copying machine, a guide pawl is provided corresponding to a plurality of stockers of different sizes, and the guide pawl is selectively operated to feed the sheet to a discharge roller provided corresponding to the stocker. It is known that the sheet is ejected to a suitable stocker by means of an ejection roller.

The sheet discharging device in this copying machine has a disadvantage in that its structure is complicated because a discharging roller and a guide pawl are provided corresponding to each stocker.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet discharging device for a copying machine with a simple configuration, which can distribute and discharge sheets to appropriate stockers according to their sizes.

The features of the present invention include a plurality of stockers of different sizes, at least one pair of discharge rollers for discharging sheets to these stockers, and a sheet size determination device that determines whether the sheet size is larger than a predetermined size. and a curved guide provided in a position intersecting a common tangential plane of the pair of discharge rollers, and rotates the sheet in a predetermined direction when the size of the sheet is larger than a predetermined size. The sheet is pinched by the discharge rollers and sent to a stocker of an appropriate size suitable for sheets larger than the predetermined size, and if the sheet size is smaller than the predetermined size, the pair of discharge rollers are temporarily moved to remove the sheet larger than the predetermined size. The sheet is rotated in the same direction as in the case of feeding, and after being fed a predetermined distance while being held by these ejection rollers, the ejection rollers are rotated in the opposite direction and the leading edge of the sheet is guided while being reversed by the guide plate to a predetermined size. The goal is to feed smaller sheets to a stocker of an appropriate size.

The present invention will be explained in detail based on the illustrated embodiments below.

In the figure, reference numeral 1 indicates a plurality of loop-shaped conveyor belts, and these conveyor belts 1 are attached to a pair of belt conveyor rollers 2 . The rotational force of these belt conveying rollers 2 moves the upper portion of the conveying belt 1 in the direction of arrow a. The upper portion of this conveyor belt 1 conveys a sheet 3 onto which a toner image of a photoreceptor (not shown) has been transferred in the direction of arrow a. An intake tank 4 is arranged inside the conveyor belt 1, and a large number of intake pores are formed in the upper wall 4a of the intake tank 4. A conveyor belt 1 is placed on the top surface of the intake tank 4.
are arranged so that the upper parts of the two are in contact with each other. The air in the intake tank 4 is discharged by a blower (not shown), and the air near the top of the conveyor belt 1 is sucked into the intake tank 4 through the intake pores, thereby sucking and conveying the sheet 3. Bring it into close contact with belt 1.

A fixing device 5 is arranged above the conveyor belt 1 . This fixing device 5 includes a flash discharge tube 5a.
It consists of a reflector 5b, a cover glass 5c, etc. surrounding this. The fixing device 5 applies a flash of light to the toner image on the sheet 3 when the sheet 3 conveyed by the conveyor belt 1 passes therebelow, heats and melts the toner image, and fixes the toner image on the sheet 3.

A feed roller 6 is disposed on the belt conveyance roller 2 on the sheet 3 conveying direction side of the fixing device 5 so as to be in pressure contact with the conveyor belt 1 . The feed roller 6 is rotated at the same circumferential speed as the belt conveyance roller 2, and the sheet 3 is sandwiched between it, the belt conveyance roller 2, and the conveyance belt 1, and is conveyed. The actuator 7 of the discharge switch 7 is located between the fixing device 5 and the feed roller 6 and between the plurality of conveyor belts 1.
When the actuator 7a of the ejection switch 7 is rotated by the sheet 3, the ejection switch 7 opens and closes the sheet size sensor circuit. A sheet detection switch (not shown) whose actuator is rotated by the sheet 3 is disposed between the ejection switch 7 and a drum-shaped photoreceptor (not shown). The switch is for opening and closing the circuit of the sheet size sensor. This sheet size sensor detects the size of the sheet 3 by operating the sheet detection switch and the discharge switch 7, and provides an output to roller rotation control means for controlling the rotation of the discharge rollers 8 and 9. Here, the sheet size sensor, the sheet detection switch, the discharge switch 7, etc. constitute sheet size determining means for determining whether the sheet is larger or smaller than a predetermined size.

A pair of discharge rollers 8 and 9 that can rotate in forward and reverse directions are arranged on the side of the feed roller 6 in the conveying direction of the sheet 3. Guide members 10 and 11 are arranged between the feed roller 6 and the discharge rollers 8 and 9. The ejection rollers 8 and 9 are arranged so that the contact portion between the ejection rollers 8 and 9 is located outside the exterior plate 12 of the electronic copying machine. A small stocker 13 is arranged below the discharge rollers 8 and 9 at a predetermined distance from the exterior plate 12.
Under this stocker 13 is a large stocker 1.
4 is placed.

When the sheet 3 conveyed by the conveyor belt 1 is larger than a predetermined size, the roller rotation control means rotates the discharge rollers 8 and 9 in the directions of arrows b and c as shown in FIG. It is conveyed while being held and discharged to the stocker 14.

When the sheet 3 conveyed by the conveyor belt 1 is smaller than a predetermined size, the roller rotation control means causes the discharge rollers 8 and 9 to temporarily stop feeding the sheet 3 larger than the predetermined size, as shown in FIG. After the sheet 3 is rotated in the same direction as in the case, that is, in the directions of arrows b and c, and is fed a predetermined distance, it is rotated in the opposite direction, that is, in the directions of arrows d and 3, as shown in FIG.
The sheet 3 is fed by being rotated in the e direction. A curved guide plate 15 is arranged above the discharge rollers 8 and 9 in a position intersecting a common tangential plane of these rollers. When the sheet 3 is fed by the discharge rollers 8 and 9 rotated in the directions of arrows d and e as shown in FIG. 3, it is guided by the guide plate 15 while being reversed toward the stocker 13, as shown in FIG. It is discharged to the stocker 13 as shown in FIG. In this case, the pages are ejected in order, which is convenient.

In addition, three or more stockers of different sizes for storing the sheets 3 are provided, a plurality of pairs of ejection rollers are arranged, and the rotation direction of these ejection rollers is controlled by the roller rotation control means as described above. 3 may be discharged to an appropriate stocker.

The sheet ejecting device in the copying machine of the present invention has a simple structure.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing a sheet discharging device in a copying machine of the present invention;
The figure is a partially cutaway front view showing the main parts of the same device. 3... Sheet, 8, 9... Discharge roller, 1
3,14...Stocker.

Claims (1)

[Scope of utility model registration request] a plurality of stockers of different sizes; at least one pair of discharge rollers for discharging sheets to these stockers; a sheet size determining means for determining whether the sheet size is larger than a predetermined size; and the pair of discharge rollers. It consists of a curved guide plate installed in a position that intersects the common tangential plane of the rollers,
If the size of the sheet is larger than a predetermined size, the sheet is pinched by a pair of discharge rollers rotating in a predetermined direction and sent to a stocker of an appropriate size suitable for sheets larger than the predetermined size, and When the size of the sheet is smaller than a predetermined size, the pair of ejection rollers are once rotated in the same direction as when feeding a sheet larger than the predetermined size, and the sheet is fed a predetermined distance while being held between these ejection rollers. A sheet discharging device for a copying machine, characterized in that the discharging roller is then rotated in the opposite direction, the leading edge of the sheet is reversed and guided by the guide plate, and sent to a stocker of an appropriate size suitable for sheets smaller than a predetermined size. .