JPS6012427A - Tray device - Google Patents

Abstract

PURPOSE:To prevent oblique movement of a sheet when the sheet is supplied again, by a method wherein, in an intermediate tray device, the sheets are contained in a condition in which the sheet side edges parallel to a direction, in which the sheet is fed, are trued up. CONSTITUTION:When a mode is selected to perform double-sided copy, an electromagnet plunger 24, simultaneously, is actuated, a push up member 23 is raised against a spring 25, and the envelope surface, by which the surfaces of push up members 23a2-23an are interconnected, is slanted downward toward a control plate 23a1. Thus, when, with this condition, a sheet 12 is conveyed and contained through a conveyance passage, the sheet is slipped down along the envelope surface, inclining downward, under gravity and makes contact with the control plate 23a1, and the side edge, parallel to a direction in which the sheet is fed, of the sheet is trued up. The push up member 23 is brought into a condition, shown in a chain line, with gravity, the restoring force of the spring 25, and the load of the sheets 12, and the sheets 12 are placed on a tray 19 and brought into a horizontal state and are fed to perform duplication on the opposite surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tray device that temporarily stores and stacks fed sheets and then feeds them again. A sheet with two sides copied is created, this first side copied sheet is temporarily stored and stacked, and then a second side copy is created on the back side of the first side copied sheet using a second original. Create first-side copy sheets for the desired number of copies using a duplex copying device or the first original, store and stack the first-side copied sheets, and then use the second original to create the first-side copy sheets. The present invention relates to an intermediate tray device in a multiple copying apparatus that creates a second original copy on the surface of a sheet whose first surface has been copied.

The role of this type of intermediate tray device is to store sheets and refeed sheets (also referred to as refeeding). The role of sheet storage is not only to simply stack and store sheets, but also to store the sheets with their side edges parallel to the sheet feeding direction aligned. Poor sheet alignment may cause the sheet to skew during subsequent refeeding, making it more likely that jams and registration errors will occur.

Therefore, conventionally, as shown in FIG. 1, side regulating plates 19a and 19b are installed on both sides of the intermediate tray 19 substantially perpendicular to the tray surface, one side regulating plate 19a is fixed, and the other side regulating plate 19b is fixed. The plate 19b is configured so that its position can be adjusted according to the sheet size.

However, in the above-mentioned conventional configuration, as shown in FIG. 2, if the seat width is taken as an expression and the distance between the side regulating plates 19a and 19b is L, then usually L>l, and the difference is about L−u=2 mm. It has become. Ideally, L=l to improve sheet alignment, but L=l cannot be achieved when sheet width variations and storage are taken into account. Therefore, when the seat is stored,
The alignment of the sheets was insufficient, and it was not possible to completely eliminate skew feeding and registration defects, especially lateral registration defects, when the sheets were fed.

There is also an intermediate tray device in which one of the side regulating plates (for example, 1b in Fig. 2) is swung or vibrated in the horizontal direction in order to improve sheet alignment in the tray device; This has the drawback of complicating the device and increasing costs.

The present invention has been proposed in view of the above-mentioned problems, and is an inexpensive and simple structure that reliably aligns fed sheets, stores and stacks them, and stably refeeds the sheets. The purpose is to provide a device for

Embodiments of the present invention will be described below with reference to the drawings. first,
Referring to FIG. 3, an outline of a double-sided copying apparatus l to which the tray device of the present invention is applied will be explained. The image of the original 2 is captured by a scanning optical system 3 consisting of a lamp 3a, movable mirrors 3b and 3c (3C is the speed of the mirror 3b), and fixed mirrors 3d and 3e. body 4
projected on top. A pre-exposure lamp 5, a charger 6, a developer 7, a transfer charger 8, a separation charger 9, and a cleaner device 10 are sequentially arranged around the photoreceptor 4. The above projection is performed on the photoreceptor during this period.

A sheet C (hereinafter referred to as paper) 12 fed out by a paper feed roller 13 from a paper (sheet) loading table 11 is synchronized with the image on the photoreceptor 4-H, and the image is transferred by the image transfer charger 8. transcribed. Next, the separation charger 9 lowers the electrostatic attraction force with the photoreceptor 4 to separate it from the photoreceptor, and the transfer means 14 transports it to the fixing device 15 where it is fixed. A conveyance path switching means 16 is disposed on the conveyance path after the fixing device 15, and this conveyance path switching means switches the conveyance path according to modes A to C shown below. This switching between modes A and C is performed by a signal from an operation panel (not shown) or the like.

In mode A for single-sided copying, the conveyance path switching means 16 is in the state shown by the broken line in FIG. .

When making double-sided copies, mode B is first used to obtain a copy of the first side. When in mode B, conveyance path switching means 1
6 is in the state shown by the solid line in FIG.
a, and are transported and stored on the intermediate tray 19.

Copied paper 1 copied on the first side to intermediate tray 19
2 has been conveyed and stored, mode C is set to obtain a copy on the second side of the paper on the intermediate tray 19. In mode C, the conveyance path switching means 16 is in the state shown by the broken line in FIG. First side copy Shibukawa paper 1 stored in intermediate tray 19
2 is transported one sheet at a time from the lower sheet to the conveyance path 1 by an auxiliary feeding roller 20, a paper feed roller 22, and a separation roller 21.
8b, the sheet is fed to the transfer section, and the sheet with a copy formed on its second side passes through the conveyance path switching means 16 and is discharged to the paper discharge tray 17, so that a double-sided copy is obtained.

4 and 5 are a perspective view and a cross-sectional view of the intermediate tray 19 in FIG. 3 to which the tray device of the present invention is applied.

Several elongated holes 191 to 19n are formed in the tray 19 in parallel to the traveling direction of the paper 12. The push-up member 23 disposed below the tray 19 has a rotation shaft 27 at one end, and a pin 23b and an elongated hole 2 at one end of the swing lever 26 at the other end.
6c, it is flexible and connected. This push-up member 23 has a regulating plate 23 on the paper side that fits and protrudes from the elongated hole 19+le on the rotating shaft side. and raised portions 23a2 to 23an that fit into the elongated holes 192 to 19n are integrally formed. The heights of the protruding portions 23a2 to 23an are lowest on the regulating plate side and higher on the other end side. The swing lever 26 rotates around a shaft 26a, and one end thereof is connected to the electromagnetic plunger 24 through a long hole 26b and a pin 24a. 25 has one end attached to the swinging lever 26
Using a spring whose other end is attached to the protruding arm 24b of the electromagnetic plunger case, the push-up member 23 is pulled down so that its push-up portions 23a2-23an are below the surface of the tray 19, as shown by the chain lines in FIG.

The embodiment of the unreleased 1y1 tray device has the configuration shown in h, and its operation will be described below. Now, when mode B is selected for double-sided copying, the electromagnetic plunger 24 is actuated at the same time as this selection, and the plunger member 23 resists the spring 25 and becomes the state shown by the solid line in FIG. The envelope surface connecting the surfaces of the raised portions 23a2 to 23n slopes downward toward the regulating plate 23a1. Therefore, in this state, when the paper 12 is transported and stored through the transport path 18a, it slides down the downwardly inclined envelope surface under its own weight and comes into contact with the regulation plate 23a1. Similarly, tray 19, l-
The paper 12 conveyed to the paper 12 comes into contact with the regulation plate, and the paper side edges parallel to the feeding direction are aligned.

Then, when copying for one side of the paper 12 is completed and copy mode C for the other side is selected, the electromagnetic plunger 24 becomes inactive at the same time as this selection. Therefore, the push-up member 23 becomes in the state shown by the chain line due to its own weight, the restoring force of the spring 25, and the load of the paper 12, and the paper 12
is placed on the tray 19-hi and placed in a horizontal state. Paper 1
2 is re-fed from this horizontal state and copying is performed on the other side.

Note that, since the regulation plate 23a and the envelope surface are approximately perpendicular to each other, the alignment of the paper 12 is not disturbed when it is placed on the tray 191, and the sheet 12 is not skewed when being fed again. There is no risk of this occurring.

FIG. 6 shows another embodiment. In this example, the tray 19 itself is tilted about the shaft 30 so that the side regulating plate 23a1, which is integrally provided on one side of the tray, is at a lower position, and 28 is an eccentric cam for controlling the inclination of the tray 19. It is driven by a step motor (not shown) or the like.

Now, for example, when the step motor rotates counterclockwise by a certain angle, the eccentric cam 28 rotates around the shaft 28a as a solid line. The intermediate tray 19 is pushed up by the eccentric cam 28, rotates counterclockwise about the shaft 27, and assumes the state shown by the solid line in FIG. 6. In this state, the conveyed and stored paper 12 slides down on the tray 19 under its own weight and comes into contact with the regulation plate 23a1 to be aligned.

After storing the paper 12, when the step motor rotates in the forward direction by the same rotation angle as described above due to mode switching, the eccentric cam 28 becomes in the chain line state, and the tray 19 lowers by its own weight until it contacts the stopper 29 and becomes horizontal. state.

The paper is fed again in this horizontal state.

Although the illustrated example shows the tray device of the present invention applied to the intermediate tray of a double-sided copying device, the tray device of the present invention can also be used as an intermediate tray of a multiplex copying device or a document placement tray of an automatic document feeder. It is.

As described in detail above, according to the tray device of the present invention, when storing paper, the receiving surface of the paper and the side regulating plate are kept perpendicular to each other, and the side regulating plate is in the direction of gravity (lower position). This is because the storage paper is aligned by tilting it and sliding it down under its own weight until it hits the side regulation plate.
Paper is stored in a well-aligned manner, allowing stable feeding without skew when refeeding. Further, the structure is simpler and cheaper than the conventional tray device, which has side regulating plates on both sides and moves the negative side regulating plate according to the paper size. Since the paper is kept in a horizontal state during paper feeding, there is no risk of degrading the paper feeding performance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional tray device, FIG. 2 is a cross-sectional view taken along the line t-FIG. 1 II-II, and FIG. 4 is a perspective view of the tray device of the present invention, FIG. 5 is a cross-sectional view taken along line V-V in FIG. 4, and FIG. 6 is a longitudinal sectional view showing another embodiment. Reference numeral 12 denotes paper, 19 a tray, 23 a regulating member 23a, a paper push-up member having thrust-L projections 23a2 to 23n, 24 an electromagnetic plunger, and 28 an eccentric cam. Patent applicant Canon Co., Ltd. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] (1) In a tray device that once stores and stacks fed sheets and then feeds them again, the sheet receiver for storing and stacking the sheets has a member and a sheet parallel to the refeeding direction of the stored and stacked sheets. The sheet receiver has a regulating member provided substantially perpendicular to the member so as to regulate the alignment of the side edges, and a first position in which the sheet receiver is inclined so that the surface and the regulating member are aligned so that the regulating member is in the direction of gravity. and a control means for selectively moving the leading edge of the sheet to a second position where the leading edge of the sheet is horizontal.