JPH0522509Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a paper feed device for a recording apparatus that can be selectively mounted between a normal paper feed cassette and a large capacity paper feed device.

BACKGROUND OF THE INVENTION Some recording apparatuses such as electrophotographic copying machines, facsimile machines, and printers allow a normal paper feed cassette to be removed and a large-capacity paper feed device to be attached to the main body of the apparatus, if necessary. In that case, a push-up member is provided on the main body of the recording apparatus in order to push up the paper loading bottom plate of the normal paper feed cassette from below and press the top surface of the paper bundle placed on the bottom plate against the paper feed roller. These parts are no longer needed, and the large-capacity paper feeder cannot be installed unless they are removed from the main body of the apparatus, so when installing the large-capacity paper feeder, these members must be removed from the main body of the apparatus, and When using a normal paper feed cassette, it is necessary to reattach these members to the main body of the apparatus. In the past, these members required a large number of parts, took time to attach and detach, and were not easy to work with.

Purpose The present invention provides a large-capacity paper feeding device that solves the above-mentioned drawbacks of conventional paper feeding devices for recording devices such as copiers, which can be installed by selecting between a normal paper feeding cassette and a large-capacity paper feeding device. It is an object of the present invention to provide a paper feeding device in which it is easy to remove and reinstall the tie member necessary for pushing up the bottom plate when replacing a normal paper feeding cassette.

Structure In order to achieve the above-mentioned purpose, the present invention integrates into a unit the straps that are attached to the main body of the recording device when a normal paper feed cassette is installed and must be removed when a large-capacity paper feed device is installed. It is characterized by being detachable from the main body.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 shows a state in which a normal paper feed cassette is installed in an embodiment of the paper feeding device of a copying machine equipped with an integrated pressure plate pressing unit based on the present invention, and Fig. 2 shows how the pressure plate pressing unit is removed from the installation. FIG. 3 is a diagram showing the configuration of the pressure plate pressing unit, showing the state in which it has been removed and a large-capacity paper feeder has been installed.

In FIG. 1, a notch 1a is provided at the front of the bottom of a paper feed cassette 1, and a bottom plate 3 on which a stack of sheets 2 is placed has its rear end pivoted to the bottom of the cassette, and is pushed through the notch 1a. A pressure lever 4, which is one of the components of the lifting unit 100, pushes up the front end portion from below, and the uppermost sheet 2 of the stack of sheets is pressed against the sheet feeding roller 5. The pressure lever is fixed to a rotating shaft 6, and a pressure arm 7 is fixed to the coaxial end, and the push-up unit 1 is connected to the pressure arm end.
A pressure spring 9 is stretched between the anchor 8 fixed to the lever 00, and the pressure lever is given a clockwise rotational habit.

A cassette receiving recess 10 is provided in the side plate of the paper feed cassette mounting portion of the main body of the copying machine, and the cassette receiving recess 10 has a guide groove 10 that becomes narrower toward the front.
a, and has an upwardly protruding portion 10b on its lower edge.
is provided. On the other hand, a rib 1a shown by a broken line in FIG. 1 is provided on the side surface of the paper feed cassette 1.
When installing the cassette 1, the rib 1a is inserted into the guide groove 10a.
When the front end of the rib 1a reaches the tip of the guide groove 10a, the paper feed cassette 1 is positioned by the front end of the guide groove with no vertical gap and the protrusion 10b, and the paper feed cassette 1 is set at a predetermined device position. .

A cam 1b is further provided on the side surface of the cassette 1, and when the cassette 1 is attached or detached, a pressure release arm 11 having a roller 11a at the tip, to which the rotating shaft 6 is fixed, is released by the cam as shown in FIG. Since the pressure lever 4, which is also fixed to the rotation shaft 6, is rotated counterclockwise at
position to facilitate attachment and detachment of the cassette 1.

In the state shown in FIG. 2 in which the large-capacity paper feeder 200 is installed, the above-mentioned push-up unit 100 is removed. Reference numeral 201 in the figure indicates a front guide 202 of the large-capacity paper feeder 200, which is a feed roller.

Next, referring to FIG. 3, the structure of the push-up unit 100 and the means for attaching and detaching it to the main body of the copying machine will be explained.

The left and right brackets 101, 102 are connected by a stay 103 having a U-shaped cross section, and the rotating shaft 6 to which the pressure arm 4 is fixed is supported by the brackets 101, 102 via a bearing. A stopper 12 restricts automatic upward movement of the pressurizing arm 7 fixed to the end of the rotating shaft 6 by the aforementioned spring 9.

The push-up unit 100 configured as described above is
As shown in FIGS. 4 and 5, a reference hole is provided in the bent portion 301 of the side plate of the copying machine main body, and the reference pins 104 and 105 on the push-up unit are fitted, and the brackets 101 and 102 are formed in the side plate of the main body. It is fixed to another bent portion 302 of the press lever 4 with four screws 303, and the mutual positional relationship is maintained by reference pins 104 and 105, and the reaction force from the pressure lever 4 is received.

Therefore, in this embodiment, four screws 30
3, the push-up unit 100 can be easily removed from the main body of the copying machine, and can also be easily reattached.

Effects As described above, according to the present invention, the push-up unit can be easily removed and reattached to the main body of a recording device such as a copying machine, so that the large-capacity paper feeding device can be quickly attached and detached. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention;
The figure is a side sectional view showing the state in which the press unit has been removed and the large-capacity paper feeder has been installed.
The figure is a perspective view showing the structure of the above-mentioned pressing unit.
5 and 5 are a side view and a front view, respectively, showing the vicinity of a portion where the pressing unit is attached to the main body of the apparatus. DESCRIPTION OF SYMBOLS 1... Paper feed cassette, 3... Bottom plate, 4... Pressure lever, 6... Rotation shaft, 100... Push-up unit, 200... Large capacity paper feed device.

Claims (1)

[Scope of utility model registration request] A normal paper feed cassette and a large capacity paper feed device can be selectively installed, and when a normal paper feed cassette is installed, the bottom plate for placing paper in the paper feed cassette is pushed up from below, making it easier to attach the main body of the recording device. In a paper feeding device of a recording apparatus having a bottom plate pushing-up cord member which is removed from the recording apparatus main body when a large-capacity paper feeding cassette is attached, the bottom plate pushing-up strap member described above is integrated into a unit and is attached to the recording apparatus main body as a unit. A paper feeding device characterized in that it is detachable from the body.