JPH02209326A - Apparatus for stacking paper sheets - Google Patents

Abstract

PURPOSE:To reduce the number of parts and simplify assembly by a method wherein in an apparatus for stacking paper sheets of a copying machine or the like having a pressing board for pressing the stacked paper sheets against a paper supplying means, the pressing board is integrally molded with a bottom box of the apparatus for stacking so that force directing upward due to its rigidity is utilized. CONSTITUTION:A pressing board 2 is integrally molded with a bottom box 1 made of synthetic resin, and at the time of using it, the board is deflected in a direction A so that the tip of the pressing board 2 is engaged with separating claws 6, 7 and separating claw axes 8, 9 are attached to separating claw axis attaching holes 4, 5. In this constitution, the pressing board 2 presses stacked paper sheets against a paper feeding roller by spring force due to deflection of the pressing board 2, thereby reducing the number of parts and simplifying assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper stacking device such as a cassette or deck used in an image forming apparatus such as a copying machine, a printing press, or an LBP.

[Prior Art] Conventionally, as shown in FIG. 6, a paper stacking device for an image forming apparatus such as a copying machine passes the hinge portion of a pressing plate 22 through a hinge holding portion 23 of a bottom box 21, and stops it with a hinge stopper 24. It is being The pressing plate 22 receives upward pressure necessary for paper feeding from the bottom box 21 by a coiled spring 25, etc.
The tip 26d of the separation claw 26 is caught on the tip of the separation claw 26 and is held down. Further, the separation claw 26 is fixed to the side surface of the bottom box 21 by a shaft 28.

[Problem that the invention seeks to solve] However,
In the conventional example described above, there are disadvantages in that the paper stacking device has a large number of parts, the assembly is complicated, and the cost tends to be high.

[Means for Solving the Problems (and Effects)] According to the present invention, by molding the press plate of the paper stacking device integrally with the bottom box, the number of parts can be reduced and ease of assembly can be improved. Can reduce costs. In addition, by utilizing the springiness of the molded product and flexing the pressure plate during use, the number of parts can be further reduced significantly, simplifying the configuration. This has the effect of simplifying assembly and reducing costs.

[Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention, which will be explained using a bottom box of a cassette used in an image forming apparatus as an example.

In the figure, 1 is a bottom box of a cassette which is a molded product of synthetic resin, 2 is a pressure plate integrally molded into the bottom box 1, 3 is a punch hole for molding the outer shape of the pressure plate 2, and 4. 5 is a hole for attaching a separation claw shaft, 6.7 is a separation claw, 8.9 is a separation claw shaft, and 10 is a paper feed roller.

First, the position of the pressing plate 2 of the molded cassette bottom box 1 is as shown in Fig. 1. When in use, the pressing plate 2 is bent in the direction of arrow A, and the separation claw 6.7 is hooked on the tip of the pressing plate 2. while attaching it to the bottom box 1 with shafts 8 and 9, respectively. The state is shown in FIG. FIG. 3 is a central cross-section of FIG. 2.

Due to the spring force caused by the deflection of the press plate 2, the stacked paper on the press plate is set to be pressed against the paper feed roller with a pressing pressure F within a necessary range during paper feeding, so the paper feed roller 1
When 0 rotates in the direction of B, sheets are reliably fed one by one.

At this time, the cassette is assumed to be of various paper types, sizes, and number of sheets loaded depending on the specifications of the image forming apparatus, but in any case, the pressing force within a certain range is required to reliably feed the loaded sheets. The size of F is determined by pressing plate 2 in Fig. 3.
It can be easily adjusted by changing the deflection angle α and the length of the arm.

As described above, the pressing plate 2 is physically molded with the bottom box 1 of the cassette (for example, injection molding of resin or the like is performed using a mold, and a nest or the like is used for the molding part of the middle plate 2). Since spring force due to deflection is used during use, the number of parts can be reduced. Therefore, there are effects such as improving the ease of assembling the cassette and reducing costs.

[Other Embodiments] Next, FIGS. 4 and 5 show other embodiments, which will similarly be described using a cassette of an image forming apparatus as an example.

In the figure, 11 is a molded product of synthetic resin. The bottom box 12 of the cassette is a pressing plate integrally molded with the bottom box 11. 13 is a punching hole for molding the outer shape of the pressing plate 12. 14.15
16 and 17 are holes for removing the separation claws 14 and 15 during molding, respectively.

First, the position of the pressing plate 12 of the molded cassette bottom box 11 is as shown in FIG. 4. When in use, the pressing plate 12 is bent in the direction of arrow C and hooked onto the separating claws 14 and 15. The state is shown in FIG. In this case as well, as in the first embodiment, due to the spring force caused by the deflection of the press plate 12, the stacked paper on the press plate is pressed against the paper feeding roller (not shown) with a pressing force within the range required during paper feeding. Since it is set to −
Paper is fed reliably one by one.

As described above, by integrally molding the separation claws 14 and 15 with the cassette bottom box 11 at the same time as the pressing plate 12, the only component of the cassette unit can be the bottom box 11, which greatly reduces the assembly time of the cassette. It has the effects of great simplification and significant cost reduction. That is, the cassette unit is composed of one part.

[Effects of the invention] As explained above, by molding the press plate of the paper stacking device integrally with the bottom box, the number of parts can be reduced, improving ease of assembly and reducing costs. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cassette bottom box of an image forming apparatus or the like after molding according to the present invention, FIG. 2 is a perspective view of the cassette after assembly, and FIG. 3 is a central sectional view of FIG. Figure 4 shows another embodiment of the present invention; a perspective view of the cassette after molding;
FIG. 5 is a perspective view of the cassette after assembly. or,
FIG. 6 shows a conventional example. 1 is a cassette bottom box, 2 is a pressure plate integrally molded on the bottom box, 4.5 is a hole for a separation claw shaft, 6.7 is a separation claw, 8.9 is a separation claw shaft, and 10 is a paper feed roller. , 11 is a cassette bottom box as another embodiment, 12 is a pressing plate integrally formed on the bottom box 11, 14 and 15 are separation claws integrally formed on the bottom box 11, and 21 is a conventional example. 22 is a press plate, 23 is a hinge portion of the press plate 22, 24 is a hinge stopper, 25 is a spring, 26 is a separating claw, and 28 is a claw shaft.

Claims (2)

[Claims] (1) A paper stacking device having a pressure plate for pressing stacked paper against a paper feeding means, characterized in that the pressure plate is integrally molded with a bottom box of the paper stacking device. (2) The paper stacking device according to claim 1, wherein the paper stacking device is configured to utilize upward force due to the rigidity of the molded press plate itself.