JPS628923A - Paper feeder for copying machine - Google Patents

Abstract

PURPOSE:To dispense with plural detecting sensors, by making size detection performable from each output of a width detecting device for a sheet paper inside a paper feeding cassette capable of housing the plural size sheet paper and a displacement detecting device of a transfer device being interlocked with a sheet paper rear end edge regulating member. CONSTITUTION:A symmetrical pair of sheet side edge guides 7a and 7b, regulating a side position of stacked sheets, are installed both sides of a sheet receiving surface 3 capable of stacking and housing those of up to maximum size sheets in service. And, a magnet support member 10 is installed in one side guide 7a, attaching sheet width detecting magnets 11a and 11b to this support member, and sheet width detecting lead switches 12a-12c are made so as to be turned on or off. In addition, there is provided with a sheet regulating plate 14 free of movement along a long hole 13 at the center of the sheet receiving surface 3, and at the time of position adjusting movement of this regulating plate 14, sheet length detecting lead switches 20a and 20b are made so as to be turned on or off by a sheet length detecting magnet 19 at a tip end of a cam 16 to be turned around a pin 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device for a copying machine, and more particularly, to a paper feeding device for a copying machine equipped with a paper feeding cassette capable of storing sheet paper of a plurality of sizes. Regarding paper devices.

Conventional technology Conventionally, the paper feed cassette of a copying machine has a function to identify the size of the paper stored in the cassette itself. However, there was an inconvenience in that it was necessary to prepare several types of paper feed cassettes for each machine, depending on the size of the paper being used.

Therefore, in recent years, a cassette (hereinafter referred to as a universal cassette) has been provided in which the paper position regulating plate in the cassette is freely movable so that one cassette can handle several types of paper.

Problems to be Solved by the Invention However, in this type of universal cassette, 1.
Since one cassette is used for paper of multiple sizes, it is necessary to detect the size of the stored paper in order to control the copying machine according to the size. This paper size detection method involves detecting the paper width (the length of the paper in the direction perpendicular to the paper conveyance direction) and the paper length (the length of the paper in the paper conveyance direction). One possible method is to determine the paper size based on a combination of detection results.

In this case, in order to use the universal cassette effectively, as shown in Figure 6 (C1), insert the tip of the universal cassette into the main body of the copying machine and expose most of the rear part of the cassette from the main body of the copying machine. This makes it possible to replace and replenish paper while the cassette is inserted into the main body of the copying machine, but in this case, the cassette must be inserted into the main body of the copying machine over the entire width of the paper. Because it is inserted, the sheet side edge guide (7a) in the width direction of the paper as shown in FIG.
(7b) is detected, and thereby the width of the paper can be easily detected on the copying machine main body side.

However, when detecting the length of the paper, as shown in FIG. In order to detect the position, it is necessary to provide a plurality of detection sensors (100) in the cassette, and detect the length of the stored paper by turning ON/OFF the detection sensors (100). Since a plurality of detection sensors are required for each cassette, the cost increases, and the cassette becomes bulky due to the connection between the detection sensor and the main body control.

Therefore, a detection sensor (100) is provided on the copying machine main body side,
Method for detecting the position of the regulation plate (114) on the cassette side (
Fig. 6(b)) is considered, but in this case, the part that is inserted into the main body of the universal cassette is large, and there are many problems with the usability of the cassette and the relationship with the arrangement of other elements on the main body side. You can change the paper while the cassette is inserted into the copier,
This results in the inconvenience of not being able to replenish supplies.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feed device for a copying machine that is equipped with a paper size detection function that solves the above-mentioned problems.

Means for Solving the Problem In a copying machine equipped with a paper feed cassette capable of storing sheets of paper of a plurality of sizes, a first detection means detects the width of the sheet paper stored in the paper feed cassette. a sheet trailing edge regulating member that is provided so as to be reciprocally movable in the paper feeding direction within the paper feeding cassette and that regulates the trailing edge of the stored sheet paper;
comprising a transmission means for transmitting the displacement due to the reciprocating movement of the regulating member in the paper feeding direction to an insertion section of the copying machine main body of the paper supply cassette, and a second detection means for detecting the displacement of the transmission means,
From the detection results of the first detection means and the second detection means,
It is characterized by detecting the size of sheet paper.

Operation: Displacement due to the reciprocating movement in the paper feeding direction of the sheet trailing edge regulating member, which is provided to be able to reciprocate in the paper feeding direction within the paper feeding cassette and regulates the trailing edge of the stored sheet paper, is calculated by dividing the displacement due to the reciprocating movement in the paper feeding direction. A transmitter is placed in the insertion part of the cassette into the copier main body.

Convey by stages. The displacement of the transmission means is detected by the detection means, and the length of the paper stored in the paper feed cassette is detected. Furthermore, the size of the sheet paper is determined based on this detection result and the detection result of a separately provided detection means for detecting the width of the paper.

Example The present invention will be explained below with reference to the drawings.

FIG. 1 shows a paper feeding device to which the present invention is applied.

(1) is a universal cassette that can be attached to and detached from the main body (2) of the copying machine. Cassette (1) is used
゛Equipped with a sheet receiving surface (3) that can stack up to the largest size sheets, and a paper feed push-up plate (4) on the sheet receiving surface (3) that is inserted into the copying machine main body (2). is swingably provided. This paper feed push-up plate (4)
When the cassette (1) is inserted into the copying machine main body (2), it is pushed up by the tip of the push-up lever (not shown) through the holes (51, (61) provided in the copying machine main body (2) and the cassette (1), respectively. The stacked sheets of paper are pressed against a paper feed roller (not shown).

In addition, on both sides of the sheet receiving surface (3), there are a pair of left and right sheet side edge guides (7) that regulate the side positions of the stacked sheets.
a) and (7b) are equipped. These sheet side edge guides (7a), (7b) are connected to rack members (8a), (8b) arranged on the back side of the sheet receiving surface (3), and each rack member (8a), (8b) are interlocked by a pinion gear (9) pivotally supported on the sheet receiving surface (3), so that each sheet side edge guide (7a), (
7b) is adjusted in the width direction of the sheet while maintaining the centering state with respect to the sheet on the sheet receiving surface (3), so that it can accommodate various sheet sizes. In addition, a magnet support member (10) is provided on the seat side edge guide (7a) in parallel with the rack member (8a), and a seat width detection magnet (tla,) is attached to the tip and mounting portion. , (tib) are provided, and the sheet width detection reed switch (12a), ('t2b)t(t2c) provided on the copying machine main body (2) is activated in accordance with the movement of the sheet side edge guide (7a). te0N-OFF
do. (See Figure 2) In the center of the sheet receiving surface (3), there is a long hole (13
), and a guide pin (15) provided at the bottom of a sheet regulating plate (14) regulating the rear end of the stacked sheets is fitted into this long hole (13).
As a result, the sheet regulating plate (14) is guided along the elongated hole (13) and can be moved in the paper feeding direction to accommodate sheets of various sizes. Further, a cam (16) is rotatably supported on the back side of the sheet receiving surface (3) around a pin (17), and the sheet regulating plate (14) is rotatably supported on the back side of the sheet receiving surface (3).
) further engages a groove (18) provided in the cam (16). by this,
When the sheet regulating plate (14) is adjusted in position in the paper feeding direction, the cam (6) rotates around the pin (17). A sheet flame detection magnet l-(19) is provided at the tip of this cam (16) on the side of the copying machine body (2), and a sheet length detection reed switch ( 20a) and (20b) are turned ON-OFF in accordance with the movement of the sheet regulating plate (14). (Figure 3,
(See Figures 4 and 5) In the above configuration, any paper can be placed on the sheet receiving surface (
3) Laminated on top of the sheet side edge guide (7a).

(7b) and the sheet regulating plate (14) are moved to match the size of the sheet, the sheet width detection magnets (11a), (11b) and the sheet flame detection magnet (19) are stacked, respectively. . Depending on the width and length of the sheet paper, press the sheet width detection reed switch (12
a), (12b), (12C) and sheet length detection reed switches (20a), (20b) The reed switches located above the magnets and directly below the magnet are in the ON state, and the other reed switches are in the OFF state. The width and length of the sheet paper are detected depending on the ON/OFF state. Furthermore, the size of the stacked paper sheets is determined by the combination of width and length detection. Table 1 shown below is a table showing an example thereof, and in the table, "T" represents vertical feed, and tsy tt represents horizontal feed.

Paper Size Table Table 1 Note that in this embodiment, the movement of the sheet regulating plate (14) in the paper feeding direction is performed by rotating the cassette (1) into the copying machine main body insertion section in a direction perpendicular to the paper feeding direction. as cam (16
), but if the configuration is such that the movement of the sheet regulating plate in the paper feeding direction is transmitted to the insertion section of the copying machine main body of the cassette as a movement corresponding to the movement, the same effect as this embodiment can be obtained. I can raise it.

Effects of the Invention As is clear from the above explanation, in a copying machine equipped with a paper feed cassette capable of storing sheet paper of multiple sizes, there is a fil that detects the width of the paper sheet stored in the paper feed cassette. a sheet trailing edge regulating member that is provided so as to be reciprocally movable in the paper feeding direction within the paper feeding cassette and that regulates the trailing edge of the stored sheet paper, and a sheet trailing edge regulating member that allows the regulating member to reciprocate in the paper feeding direction. a transmission means for transmitting the displacement due to the movement of the paper feed cassette to the copying machine main body insertion section; and a second detection means for detecting the displacement of the transmission means, the first detection means and the second detection means Based on the detection results of The size of the paper is small, and the cassette is easy to use (and there are no problems with the arrangement of other elements on the main body side. Furthermore, the paper size can be detected reliably with a simple configuration.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the universal cassette and the cassette insertion part on the main body of the multi-7z machine, Figure 2 is a perspective view showing the mechanism of the seed side edge guide, Figure 3 is a perspective view showing the sheet regulating plate and cam, Figures 4 and 5 are a top view and a front view of the universal cassette, and Figure 6 (a). (b) is a diagram showing a method of detecting the length of sheet paper stored in the paper feed cassette, and Figure 6 [0] shows one form when the universal cassette is inserted into the main body of the copying machine. It is a diagram. (11... Universal cassette, (7a), (7b
)...Seat side edge guide, (Ha), (nb)...
Sheet width detection magnet, (12a,), (12b>,
(,12c)...Sheet width detection reed switch, (
131)...Long hole, (14)...Sheet regulation plate, (
16)...Cam, (19)...Seat length detection magnet, (20a), (20b)...Seat length detection reed switch.

Claims (1)

[Claims] In a copying machine equipped with a paper feed cassette capable of storing sheet paper of a plurality of sizes,
a sheet trailing edge regulating member that is provided to be reciprocally movable in the paper feeding direction within the paper feeding cassette and that regulates the trailing edge of the stored sheet paper; and a second detection means for detecting the displacement of the transmission means, wherein the first detection means and the second detection means are connected to each other. A paper feeding device for a copying machine, characterized in that the size of a sheet of paper is detected based on the detection result.