JPS607788B2 - Paper feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for a cassette paper feeding type copying machine.

The paper size mainly used in electronic copying machines is A4 (A series).
, A body and B series B4, B5, and Bfu.

Paper of each size is stored in a cassette according to the size, separated one by one, and fed into the main body of the copying machine. In the case of a cassette that has corner claws at both ends, the paper feed roller that separates and feeds the paper stored in the cassette should be installed with a distance of approximately 20 mm between its outer edge and the side edge of the paper. Common. Therefore, the installation positions of the paper feed rollers for feeding the A-row size and B-row size paper differ depending on the paper size. If the cassette mounting section, so-called paper feed port, provided in the copying machine main body is provided separately for A row system and B row system, the relationship between the position of the paper feed roller and the paper size is as follows. Although this is not a problem, if the paper feed device uses one paper feed port to feed paper in row A and row B, it is necessary to provide paper feed rollers for each paper feed.

That is, as shown in FIG.
, Loaf-3 for sending A4 size paper, and B
It requires three rollers, such as Rofu 4 for feeding four sizes of paper.

In the figure, reference numeral 1 indicates a shaft for driving the paper feed roller. However, in order to feed B6 size paper with the paper feed roller arrangement shown in FIG. 1, another paper feed roller 53 is required as shown in FIG.

Therefore, in a device that feeds paper of various sizes from one paper feed port, it is necessary to provide many paper feed rollers on one drive shaft, and also in a cassette, it is necessary to prevent unnecessary paper feed rollers from getting in the way. consideration must be given to this.

Furthermore, each paper feed roller has a built-in one-way clutch to prevent skew, and requires considerable shaft precision, so increasing the number of rollers directly affects cost increases. Therefore, if the paper feeding roller is installed so as to be movable in the thrust direction and its position is selected according to the size of the paper to be fed, there is no need to increase the number of lofts as described above.

Incidentally, in order to convey the paper in rows A and B using two paper feed rollers, it is sufficient to move the movable paper feed roller on the opposite side from the reference side by approximately 47 steps from the paper side edge.

Further, in order to convey A4 and B6 size paper using two paper feed rollers, it is sufficient to move the paper to the 28 side as shown in FIG. 2 in the same manner as above. Conventionally, the paper feed roller was moved manually, and the paper feed roller was temporarily fixed at a selected position, for example, by positioning the holder by placing it over the roller, or by fixing the holder with screws. I was doing paper work. Therefore, when using paper of different sizes, there is a drawback that mounting the cassette is troublesome. The present invention allows one of the paper feed rollers to move freely in the thrust direction and holds the paper feed roller at a specific position by means of a loaf holding means that restricts the movement. It is an object of the present invention to provide a paper totaling device which can be operated by simply mounting the cassette, and in which the paper feed roller returns to its original position when the cassette is removed.

The present invention will be described below based on illustrated embodiments.

As shown in FIG.
0 and 21, a front plate 22, a rear side plate (not shown), and a bottom plate 19, it is formed into a box shape, and a partition plate 23 is provided in parallel with the side plates 20 and 21 with the end fixed to the front plate 22. There is.

Corner claws 25, 25 are provided at the corners of the leading end of the partition plate 23 and the leading end of the side plate 21. A cam 24, which serves as a roller moving means and has a cam surface 24a, is fixed to the side surface of the partition plate 23 opposite to the sheet storage side in a state opened toward the front. The bottom plate 19 is adapted to be lifted upward by a paper feed pressure lever 72 shown in FIG.

On the other hand, as shown in FIGS. 3 and 5, a roller holding means for moving the paper feed roller 7 along the drive shaft 6 is provided inside the main body of the copying machine. That is, the lever bar 10 is attached to the support shaft 15 fixed to the immovable support plate 17.
is attached so that it can rotate freely. A holder 9 having U-shaped holding portions 9a, 9a is pivotally attached to the free end of the lever 10 by a shaft 12 and an E-ring 11 so as to be rotatable about the shaft 12. Since the above-mentioned holding parts 9a and 9a are provided with the paper feed roller 7 on the drive shaft 6 in between,
Rotation of the lever 10 allows the paper feed roller 7 to move on the drive shaft 6 in the thrust direction. Note that the paper feed roller 7 is equipped with a one-way rotation clutch 8 that transmits the rotation of the drive shaft 6 to the paper feed roller 7 in the paper feed direction, but the rotation of the drive shaft 6 is transmitted to the paper feed roller 7 in the opposite direction. 7 is set to idle. That is, rotationally, the paper feed roller 7 is integrated with the drive shaft 6 via the clutch 8,
It is mounted so that it can move freely in the thrust direction. Also axis 1
5, a torsion spring 16 is inserted, one end 16b of which is fixed to the stopper 14 fixed to the support plate 17, and the other end 16a
Each of the ladder bars 10 is locked to one side edge of the ladder bar 10,
The river rod is given a counterclockwise rotational habit as shown by arrow a (see Figure 3).

A cam follower 13 is fixed in the center of the lever 10, and a roller 13a is rotatably mounted on the tip of the cam follower 13, and when the cassette 18 is set in the copying machine through the insertion port 60, the fourth It is configured to support the cam surface 24a of the cam 24 shown in the figure.

The present invention is a mechanism in which one paper feed roller 7 serves as the paper feed roller 53 for A4 size and B6 size shown in FIG. Alternatively, for the B5) size, the paper feeding roller can also be used in the same manner as above.

This will be explained with reference to FIGS. 3 to 7. When the cassette 18 is inserted into the cassette insertion port 60 opened on the side plate 61 of the copying machine body and pushed further along the guide, the cam 24 provided on the partition plate 23 and the lever bar 101 are rotatably supported. I support Koro 13a of Cam Follower 13.

With the help of the cam 24, a moment is applied to the lever 1 through the roller 13a in the opposite direction to the arrow a, and the torsion spring 1 is
The lever 10 is rotated in the opposite direction to the arrow a about the support shaft 15 against the tendency of the lever 10 to rotate in the direction of the arrow a by the arrow 6. Therefore, the holder 9 rotatably supported by the free mechanism 10a of the lever 10 is moved along the roller drive shaft 6 in the direction of the other paper feed roller 2 with the paper feed roller in between. That is, when the cassette 18 is fully pushed into the insertion port 60 of the main body of the copying machine, the holder 9
The paper feed roller 7 sandwiched between
It is configured to automatically move to a position suitable for six sizes of paper. The cam 24, roller 13a, and lever 1 are provided in a proper positional relationship so that the above movement can be performed accurately.

The positions of the lever 10 and the holder 9 are fixed in such a way that the torsional force of the torsion spring 16 is received by the roller 13a on the cam surface 24a, so that the holder 9 acts as a thrust force to the paper feed roller 7 and the roller drive shaft 6. It has no effect.

Therefore, no force is exerted that would impede the rotation of the paper feed roller 7. When the cassette 18 is pulled out from the copying machine main body, the lever 10 is given the habit of swinging in the direction of the arrow a by the spring 16, so the integrated holder 9 holds the paper feed roller 7 in place. In other words, the paper is moved back in a direction away from the paper feed roller 2 that is currently in use, in other words, it is moved back toward the orientation calendar for A4 size.

The above-mentioned fixed position is determined by a stopper 14.

That is, the stopper 14 is fixed to the support plate 17 so that the position where the lever 10 hits the stopper 14 is the appropriate position of the paper feed roller 7 for A4 size paper. In this case as well, since the stopper 14 is acted upon by the torsion spring 16, this force is applied to the paper feed roller 7 and the roller drive shaft 6.
Therefore, the paper feeding low-fu 7
There is nothing that will impede the rotation of the. As for the position of the paper feed roller 7, in the case of paper size A4, the dimension from the paper side edge to the outer edge of the loaf is approximately 2 cm, as shown in FIG.

The lever 10 is fixed in the position shown in the figure by its rotational behavior in the clockwise direction with a twist 16 about the shaft 15. Next, by installing a specific cassette for paper size 6, the paper feed roller 7 moves along the roller shaft 6 in the direction of the fixed paper feed roller 2, and as shown in FIG. The dimension Z2 from the paper side edge of the paper size to the outer edge of the paper feed roller 7 is approximately 2 cm, and the dimension Z2 from the paper side edge of A4 size to the outer edge of the paper feed roller 7 is approximately 47 cm. Become.

For comparison with the position in FIG. 6, the roller position relative to A4 size paper is indicated by a broken line. By inserting the cassette 18 equipped with the cam 24 as described above, it becomes possible to feed paper of different sizes.

This can be done not only in the case of A4 and B6 shown in Figure 2, but also in the case of B4 and A4 as shown in Figure 1, by attaching a similar cam to the end of the A4 partition plate. Similarly, the loaf can be moved. In the above embodiment of the present invention, when using a conventional cassette containing A4 paper, the paper feed loft is kept in the proper position, and the B
When using a B6 size paper, a special cassette equipped with a cam as shown in FIG. 4 is used to automatically set the paper feeding loft at the appropriate position for the B6 size paper.

FIGS. 8 and 9 show other embodiments of the present invention.

That is, the structure of the cassette 88 is substantially the same as that of the previous embodiment, but in this embodiment, instead of the cam 24, a roller member 34 is provided as a roller moving means. Further, a first lever 90 and a second lever 91, which constitute roller holding means, are connected to a stationary member within the copying machine by a guide pin 83 in a direction that intersects with each other at an intermediate portion. One end of the first lever 90 is a shaft 80 fixed to an immovable member.
The bent portions of the second lever 91, which are bent into an L-shape, are rotatably connected to shafts 81 fixed to the fixed portion. The first lever 90 has a guide groove 84 formed in the middle thereof in a direction that is slightly inclined from the longitudinal direction of the lever 90, in other words, in a direction that intersects with the rotation locus of the guide pin 83.
is provided, and the rotation of the guide pin 83 causes the first
Since force is applied along the periphery of the guide groove 84 of the lever 90, the lever 90 rotates about the shaft 80. The holder 9 is rotatably attached to the free end of the first lever 90 by a pin 12, and the second lever 91 is formed into an L-shaped lever around a shaft 81, and one end 91a of the second lever 91 is formed into an L-shaped lever. The reinforcement pin 46 is fixed, and a compression spring 85 is stretched between the other end 91b and the pin 82 fixed to an immovable member, and the second lever 91 is rotated in the direction of arrow P. Habits are given.

The free end of the holder 9 has U-shaped holding parts 9a, 9a.
is formed.

Further, the above-mentioned holding parts 9a, 9a are provided to sandwich the paper feed roller 7 that moves along the roller drive shaft 1. When the specific cassette 88 shown in FIG. 9 is installed in the copying machine, the abutting member 34 of the cassette 88 comes into contact with the abutment pin 46 of the second lever 91 as shown by the two-dot chain line in FIG. The lever 91 is rotated about the shaft 81 in the direction of the arrow Q.

Therefore, the guide pin 83 is connected to the guide groove 84 of the first lever 90.
While pushing and moving the side peripheral surface of the guide groove 84, move the groove end 84a.
As a result of moving from the side toward the side 84b, the first lever 9
It is spread in the direction of arrow T centering on the river axis 80. Therefore, since the holder 9 is moved along the roller drive shaft 6 in the direction of arrow T, the paper feed roller 7 held by the holder 9 moves along the roller drive shaft 6 in the direction of the fixed paper feed roller, in other words. It moves toward the position according to the size of the paper stored in the cassette. Then, when the specific cassette 88 is removed, the second lever 91 rotates back in the direction of arrow P around the ball 81 due to the behavior of the compression spring 85, so that the guide pin 83 is inserted into the guide groove of the first lever 90.
84a from the groove end 84b without pushing and moving the side peripheral surface of 4.
Therefore, the first lever 9 rotates about the axis 80 in the direction of arrow S. Since the holder 9 provided at the free end of the first lever 90 moves together with the above-mentioned bar 90, the paper feed roller 7 sandwiched between the holding parts 9a and 9a moves along the roller drive rack 1 to the initial setting position. Move automatically. According to the present invention described above, since the cassette itself is provided with a roller moving means for selecting the position of the paper feed roller, the paper feed roller is automatically moved to the appropriate position according to the paper size at the same time as the cassette is installed. The operation is simple because when the cassette is moved to a certain position and set and the specific cassette is removed, it returns to the stereotaxic layer of another size.

In addition, since only two paper feed rollers are required, the cost of the product is lower than that of conventional products.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the proper positional relationship between B4 size and A4 size paper feeding rollers, FIG. 2 is a plan view showing the proper positional relationship of the paper feeding roller in an embodiment of the present invention, and FIG.
The figure is a perspective view showing the paper feed roller moving device of the present invention.
The figure is a perspective view showing only the appearance of a specific cassette in the paper feeding device of the present invention, FIG. 5 is a side sectional view showing an embodiment of the paper feeding device of the present invention, and FIG. 6 is a paper feeding roller of the present invention. A plan view showing the state of the moving device at a specific position for A4 size, and FIG. , FIG. 8 is a perspective view showing a paper feed roller moving device according to another embodiment of the invention, and FIG. 9 is a perspective view showing only the main parts of a specific cassette according to another embodiment of the invention. 6...Drive shaft, 7...Paper feed loft,
18...Power set. Purple 'Picture Boar 2 Figures 3 Figures Sperm Figure 5 Congee 6 Figure 17 Group 8 Figure 9

Claims (1)

[Claims] 1. In a cassette paper feeding type copying machine, there is a paper feeding roller mounted on the drive shaft so as to be movable in the axial direction, and a paper feeding roller provided on the copying machine main body that allows the paper feeding roller to rotate freely and in the axial direction. A roller holding means that movably clamps the paper feed roller and has a tendency to move in a direction to return the paper feed roller to the normal position, and a cassette for storing sheets of a specific size are provided, and the cassette is installed in the main body of the copying machine. roller moving means that engages with the roller holding means and pushes the means against its tendency to move the paper feed roller from a fixed position to a specific position; A paper feeding device characterized in that the paper feeding roller is moved to a specific position when a cassette containing sheets of paper is attached, and the paper feeding roller is returned to a normal position when the cassette is removed.