JPS61101346A - Copy paper supply unit - Google Patents

Abstract

PURPOSE:To shorten a time required for selecting an assigned tray for copy paper by decreasing required times of stopping a paper supply unit during its vertical travel by means of some alteration of control. CONSTITUTION:When a tray, on a stage higher than the stage of presently selected tray, is selected, a paper supply unit 3 rises and when SW(2) is put ON, tray 7-(2) moves in B direction. Then, the unit 3 continues its movement and stops at a position where SW(1) is put ON. Then, tray 7-(1) moves in A direction, and when it stops, unit 3, and stops at an assigned position, providing the state ready for copy work. On the other hand, when a tray on a lower stage is selected, the unit 3 rises and stops when SW(2) is put ON. At the same time, with SW(2) ON, tray 7-(2) retreats (B direction) from a paper supply position and tray 7-(3) moves to the paper supply position. When both trays stop, the unit 3 descends, and stops at the assigned position, providing the state ready for copy work. Thus, a time required for selecting an assigned tray can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a paper feeding device in an image forming apparatus such as a copying machine, and particularly to an improvement of a large-capacity transfer paper feeding device that has a multi-stage transfer paper storage section separate from the main body. This is related.

(Prior art) Recently, a large number of transfer paper accommodating sections are provided in parallel in the vertical direction separately from the main body of a copying machine, and a single vertically movable paper feeding device is provided, and the entire unit is integrated into a large capacity transfer paper supply. A device has been proposed.

In this type of transfer paper supply device, the transfer paper storage section (tray) is located at the paper feeding position and at the non-paper feeding position! ! It is configured to move horizontally. This is to prevent the tray from getting in the way when the paper feeding device vertically moves up and down on the leading end side of the tray.

Conventionally, when newly selecting another tray from the currently selected tray, the control operation for moving the paper feeder up and the control operation for moving it down were the same.

By the way, if you want to move the tray upward, you can move the tray upward without first moving the currently selected tray to the tray's home position; conversely, if you want to move the tray downward, you must move the current tray. You cannot move unless you do so.

(Purpose) The present invention was made in view of the above circumstances, and an object of the present invention is to enable tray selection with less waiting time by changing the control method when moving the paper feed device up and down. That is.

(Configuration) For this purpose, the present invention detects the home position of the paper feeder to move the currently selected tray to the home position when the tray is to be moved upward, without stopping the paper feeder. , is characterized in that it continues to rise.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front view of an embodiment of the present invention, in which a copying machine main body 1 and a transfer paper supply device 2 are separated and used in combination. In the embodiment, the transfer paper supply device is equipped with 246 trays 7, and six types of transfer paper P can be stored. The tray 7 is engaged with a cam 91C on a tray holder 8 so as to be movable in directions A and B in the figure, and the tray holder 8 is connected to the main body frame of the transfer paper supply device 20 via a rail member 10 in the first direction.
In the figure, it is engaged so that it can be freely pulled out toward the front. cam 9
is selectively driven by a clutch, which is not shown in the drawings. This clutch may rotate either half a turn or one turn. In the case of a half-turn clutch, the tray 7 operates in constant contact with the cam 9, and in the case of a one-turn clutch, the tray 7 moves the maximum amount in the input direction by the cam 9, but does not move in the B direction due to the sharpening stopper. You can stop it like that.

The paper feeding device 3 is engaged with the main body frame via a guide member so as to be able to move up and down, and is moved up and down by a motor 59 via a wire 4.

The operation and details of each part will be explained below.

Now, suppose that the user selects any one tray among the six trays. In response to the selection command, first, the paper feed device 3 is placed above the selected tray 7 and after the maximum number of sheets of transfer paper has been placed, the paper feed device 3 is moved to a position (second
In the figure, it moves to δ>0) and stops.

Next, the selected tray 7 is moved to the paper feeding position (first position) by the cam 9.
When the paper feed device 3 is pushed out in the input direction (in the figure) and stopped, the paper feed device 3 descends. Then, the position of the paper feeding device [3 is controlled so that the pick-up row 211 and the transfer paper P come into contact and the inclination angle θ of the arm 12 of the pick-up roller 11 shown in FIG. 3 is always within a certain range. This can be achieved by the same control method as the control method in which the paper feeder 3 is lowered as the number of transfer sheets P decreases during copying. When θ falls within a predetermined range, the paper feeding device 3 stops and becomes ready for copying.

If the user presses the copy button, no instructions will be printed on the drawing f
Each roller of the paper feeding device 3 is driven by the moving device, and the transfer paper P is fed one by one. The fed transfer paper P is separated and changed direction in the paper feeding device 3, and is transferred to the main body of the copying machine by two conveyor belts 6 arranged in front and behind the paper feeding device 30 in FIG. The paper is vertically conveyed to the copying machine, and a copying operation is performed within the copying machine.

Furthermore, in the event of an abnormality such as a paper jam, the paper feeder 3 along with the conveyance path is opened centering on the 0 point as shown by the dashed line in the figure, and the transfer paper remaining in the machine can be removed. Since the paper feed device 3 is both opened, all the transfer paper remaining in the device can be removed without pulling out the tray 7. In addition, maintenance (replacement, cleaning) of each roller constituting the paper feeding device 3 can be easily performed. a), (b) are tray 7
-(2) is selected, the user selects tray 7-(
This is a flowchart showing the operation when No. 11 is newly selected.

In Figure 4, 5W (11-(3) is tray 7-(11-7-)
For each transfer paper storage section in (3), after loading the maximum number of transfer papers on the 70 tray, detect the position of the paper feeder 3 where the calling roller ]l and the top paper are not in contact. and the home position.

FIG. 5(a) The upper tray of 1 unit is newly selected, and the tray 7-(
The flow when the paper feeder 3 moves from 2) to 7-(11), the same figure (bl is conversely, the lower stage is newly selected, and the tray 7-
This is the flow when the paper feeding device 3 moves from (2) to 7-(1).

When a tray above the currently selected tray is selected, the paper feeder 3 rises, and when 5W (21) is turned on, the tray 7-(2) moves in the direction B in Fig. 4. The paper device 3 continues to move and stops at the position where 5W (t) is turned on.When 8W (1) is turned on, the tray 7-(1) moves to the paper feeding position (direction A in Figure 4) and stops. Then, the paper feeding device 3 descends and stops at a predetermined position, allowing copying.

When a tray lower than the currently selected tray is newly selected (FIG. 5(b)), paper feed bag R3 rises and 5Wf
When 2) is turned on, the paper feeding device 3 stops.

Simultaneously Vc8 W (Tray 7-(2) by turning on 21
moves away from the paper feeding position (moves in direction B in FIG. 4), and tray 7-(3) moves to the paper feeding position (in direction in FIG. 4).

When both trays stop, the paper feeder 3 descends and stops at a predetermined position, allowing copying.

By dividing the control operations when the upper storage section is selected and the lower storage section is selected from the transfer paper storage section selected as described above, the control [process will be somewhat complicated, but
The number of stops of the paper feeder can be reduced, and the tray selection time can be shortened.

(Effects) The present invention is as described above, and according to the paper feeder vertical movement control method of the present invention, the time required to select a transfer paper storage section can be shortened.

[Brief explanation of drawings]

FIG. 1 is a front view showing the internal mechanism of a transfer paper supply device according to an embodiment of the present invention, FIG. 2 is a diagram showing the positional relationship between the top paper and the calling roller during tray selection, and FIG. 3 is a diagram showing the tray selection. Figure 4 is a front view showing the relationship between the selected tray and the paper feeder, Figure 5(a) is the control flow when the paper feeder is raised, and Figure 5(b) is +z. This is a control flow when the paper feeder is lowered. 3...Paper feeding device, 7...Transfer paper storage section. Agent Patent Attorney Take Junjibu “,,′,;11 voices, no, + Figure 1

Claims (1)

[Claims] In addition to providing a plurality of transfer paper storage sections almost horizontally stacked,
Feeding in a transfer paper feeding device having means for vertically moving a single paper feeding device to a selected transfer paper storage section position and means for moving the selected transfer paper storage section to a paper feeding position in the feeding direction. When the paper device moves upward, it continuously moves to the home position of the paper feed device corresponding to the newly selected transfer paper storage area, and when it moves downward, it moves continuously to the home position position of the paper feeding device corresponding to the newly selected transfer paper storage area, and when it moves downward, it moves to the currently selected transfer paper storage area. 1. A transfer paper supply device characterized in that the transfer paper supply device is controlled to temporarily stop at a home position of the paper feed device corresponding to the copy and then move downward.