JPH0511235Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a paper feeding cassette tray for copying machines, printers, etc.

2. Description of the Related Art In electrophotographic copying machines, printers, etc., an electrostatic latent image formed on a photoreceptor or dielectric material is developed with toner, and this toner image is transferred onto copy paper or print paper. It has become established and is getting hard copies. As methods for feeding copy paper or print paper, there have been proposed methods using paper cut into standard sizes in advance and paper feeding methods using roll paper and cutting it into desired sizes. Using roll paper has the advantage of not causing problems such as double feeding, but it requires a lot of space to load multiple sizes of roll paper into a copier or printer. Recently, paper feeding methods that use paper that has been cut into standard sizes have become common.

Recently, as the needs of copiers and printers have diversified, the copy paper size and print paper size used have also diversified.
It has become necessary to prepare four types of paper.
Since it is troublesome to adjust the size and reload paper of many sizes using a single paper supply toner, these days, almost all paper cassette trays are prepared with multiple sizes. It is becoming common to use paper feeding methods in which paper sheets are exchanged depending on the desired copy size or print size.

If you want to copy on paper of a size other than that set in the cassette tray of the copier,
You have to pull out the cassette tray from the copier and change the cassette tray size, but
Since the top sheet of paper in the tray is in pressure contact with the paper feed roll during this pulling out, the top sheet of paper often shifts when the cassette is pulled out. When the cassette tray is pulled out in the side direction of the copying machine, that is, when the cassette tray is pulled out in the same direction as the paper feed direction, the paper feed roll rotates when the cassette tray is pulled out, so the paper on the top surface does not shift as much. If the cassette tray is pulled out from the front of the copying machine, the paper feeding direction and the pulling direction are perpendicular, so the topmost surface of the paper stored in the cassette tray or several sheets of paper from the topmost surface may be easily removed. Paper misalignment occurs.

Therefore, in the past, the pressure lever that presses the paper stored in the cassette tray against the paper feed roll was released using an external operating part, or the cassette was pressed against the bottom plate on which the paper was placed. A mechanism has been proposed in which a lever is attached and the paper is separated from the paper feed roll by operating the cassette lever.

Problems that the invention aims to solve However, in the conventional paper feeding cassette device as described above, it is necessary to release the operating part or lever before pulling out the cassette tray.
There is a problem in that an action operation is required.
Also, I often forget to release the lever or other release parts and pull out the cassette tray.
In this case, problems such as misalignment of paper or the cassette tray not coming out may occur.

The present invention was developed in view of these circumstances, and its purpose is to provide a paper feed cassette tray that can reliably separate paper from the paper feed roll with a single touch operation when pulling out the cassette tray. It is.

Means for solving the problems In order to solve the problems of the above-mentioned conventional technology,
The present invention is a paper feeding cassette tray for an image forming apparatus, and has a bottom plate that is movable between an operating position and a non-operating position biased by a biasing means. When it is displaced to
In a paper feed cassette tray configured to send out the paper stored in the cassette tray by a paper feed roll installed in the main body of a machine such as a copying machine or printer, the cassette tray body has a handle that can move in the direction in which the cassette tray is pulled out. and when the handle is pulled and moved relative to the cassette tray body,
A paper feeding cassette tray characterized in that interlocking means for displacing the bottom plate to a non-operating position is provided between the handle portion and the bottom plate, and holding means for holding the cassette tray main body at the mounting position is provided. I will provide a.

The interlocking means can be constructed by, for example, connecting the handle and the bottom plate with a wire.

Operation When it becomes necessary to pull out the cassette tray due to changes in the copy paper size, etc., pull the handle and the bottom plate of the cassette tray will be pulled out from the operating position where it is in pressure contact with the paper feed roll via the interlocking means linked to this. Displaced to a non-operating position without contacting the paper feed roll. By pulling the handle further, the holding force of the holding means can be overcome and the cassette tray can be removed from the copying machine.
Alternatively, it can be pulled out from the main body of a machine such as a printer.

Embodiments Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

Referring to FIG. 2, there is shown a schematic diagram of a copying machine to which the paper feed cassette tray of the present invention is applicable. The photosensitive drum 10 is uniformly charged to a positive or negative polarity by a charging corotron 12, and an electrostatic latent image corresponding to the original 20 is placed on the photosensitive drum by a scanning exposure device 18 consisting of an exposure lamp 14, a lens 16, and a mirror (not shown). 10. The electrostatic latent image on the photosensitive drum 10 is developed by a developing device 22 such as a magnetic brush developing device, and the developed toner image is transferred to a paper feeding device 26 by a transfer corotron 24.
The image is transferred onto the paper 28 sent from. The transferred toner image on the paper 28 is fixed by a fixing device (not shown) to become a permanent image. On the other hand, the photosensitive drum 10
The upper untransferred toner image, that is, the residual toner image, is cleaned by a cleaning device such as the cleaning blade 34, and one copy cycle is completed.

The paper feeding device 26 is configured to bias the bottom plate 38 of the cassette tray from below with a constant pressing force by a biasing means such as a spring 36, and feed the sheets 28 stacked on the bottom plate 38 by a supply roll 32. There is.
In FIG. 2, the cassette tray having the bottom plate 38 is configured to be pulled out in a direction perpendicular to the plane of the paper.

Next, referring to FIG. 1, there is shown an embodiment of the paper feeding cassette tray of the present invention, in which a bottom plate 38 on which paper 28 is loaded is provided in the main body 42 of the cassette tray 40. and
Since the bottom plate 38 is urged upward by the pressure lever 44, one of the top sheets of paper 28 stacked on the bottom plate 38 is in pressure contact with the paper feed roll 32, and the paper feed roll 32 is pressed against the paper feed roll 32. The topmost sheet of paper 28 is sent out by rotational driving. Main body 42 of paper feed cassette tray 40
A handle 48 is attached to the front portion 46 of the main body 42 via a guide portion (not shown) so as to be movable relative to the main body 42, and the attachment 48 is movable between a solid line position and a dotted line position. There is. A wire 50 is attached across the bottom plate 38 and the handle 48, and the wire 50 is passed around pulleys 52 and 54.

Reference numeral 56 denotes a holding mechanism for holding the cassette tray 40 at the device position, and is constructed as shown in FIG. 3, for example. An engaging portion 58 is provided protruding from the rear of the cassette tray body 42, and an engaging groove 60 is formed in the engaging portion 58. On the other hand, the engaging member 62 has two arms 64 and 66, and an engaging protrusion 70 is formed at the tip of the arm 64. The engagement protrusion 70 is provided with an inclined surface 72 that makes the engagement protrusion tapered. A spring 74 is attached to the tip of the arm 66, and urges the holding member 62 counterclockwise about the rotation shaft 68. 76 is a stopper for preventing rotation of the holding member 62.

However, if you want to pull out the paper feed cassette tray 40 installed in the copying machine toward the front of the copying machine, as shown by the solid line in FIG. can be pulled out from the front of the copier.
When the handle 48 is pulled in the direction of arrow A, the handle 48 moves to the dotted line position along a guide member (not shown) provided on the front surface 46 of the cassette tray body 42. As the handle 48 moves, the bottom plate 38 is also connected to the handle 48 by the wire 50.
The sheet 28 is lowered to the position indicated by the dotted line in the figure by overcoming the biasing force of the pressure lever 44, and the uppermost surface of the paper 28 stacked on the bottom plate 38 becomes separated from the pressure roll 32. When the handle 48 is pulled more strongly, the engagement protrusion 70 of the engagement member 62 engages the cassette tray body 42.
The paper feed cassette tray 40 can be pulled out toward the main body indicated by the arrow A.

When you want to install the paper feed cassette tray 40 into the copying machine, push the cassette tray 40 in from the front of the copying machine, and the engaging portion 58 of the main body 42 will align with the inclined surface 72 provided on the engaging protrusion 70 of the holding member 62. By pressing, the holding member 62 is rotated clockwise, and the engaging protrusion 70 is finally fitted into the engaging groove 60, so that the paper feed cassette tray 40 is held at this position.

Effects of the Invention As detailed above, the present invention is configured such that the handle of the paper feed cassette tray is movable in the direction of pulling out the cassette, and the handle and the bottom plate for stacking paper are interlocked by an interlocking means. Therefore, the paper stacked on the bottom plate can be reliably separated from the paper feed roll by a one-touch operation of pulling the handle when pulling out the cassette tray. Therefore, it is possible to reliably avoid problems that occur in conventional devices, such as forgetting to operate a separately provided release component, causing sheets to shift, or the cassette tray not being able to be pulled out.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a paper feed cassette tray of the present invention, FIG. 2 is a schematic diagram of a copying machine to which the paper feed cassette tray of the present invention can be installed, and FIG. 3 is a detailed diagram of a holding mechanism. 28...Paper, 32...Paper feed roll, 38...
Bottom plate, 40...Paper feeding cassette tray, 42...
Cassette tray body, 44... Pressure lever, 48
... Handle, 50 ... Wire, 52, 54 ... Pulley, 56 ... Holding mechanism, 60 ... Engagement groove, 62 ...
...Holding member, 70...Engaging protrusion.

Claims (1)

[Claims for Utility Model Registration] A paper feeding cassette tray for an image forming apparatus, which has a bottom plate that is movable between an activated position and a non-activated position urged by a biasing means. In a paper feed cassette tray configured to feed out paper stored in the cassette tray by a paper feed roll provided in the machine body of the image forming apparatus when the paper is displaced to the operating position by a means, the cassette is Interlocking means comprising a wire and a pulley around which the wire is wound, which is provided with a handle movable in the tray pulling direction, and which displaces the bottom plate to a non-operating position when the handle is pulled and moved relative to the cassette tray body. A paper feeding cassette tray characterized in that a holding means is provided between the handle portion and the bottom plate and holding the cassette tray main body at the mounting position.