JPS60112540A - Paper feeding apparatus of copying machine - Google Patents

Abstract

PURPOSE:To permit the smooth mounting and demounting operation for a paper feeding cassette by positioning the pushing-up piece of a middle-plate pushing-up mechanism for pushing-up the middle plate of the paper feeding cassette lower than the transfer region for the cassette when the cassette is mounted and demounted. CONSTITUTION:When a paper feeding cassette 50 is inserted into a mounting port from the front surface of a copying machine, the pushing-up piece 28 of a middle-plate pushing-up mechanism 35 is at the inoperative position lower than the transfer region on mounting the cassette 50, and therefore, the paper feeding cassette 50 is smoothly inserted and positioned. Then, a start button in the operation part is pushed to operate the copying machine, and a driving shaft 21 is turned by 180 deg., and a rotary plate 22 is tuned, and then lever members 23 and 24 are swung upwardly, and the pushing-up piece 28 integrally formed with the lever member 24 is projected from the lower opened port part 29 of the paper feeding cassette 50, and the middle plate 54 of the cassette 50 is raised, and a bundle of paper sheets loaded onto the upper surface of the middle plate 54 is transferred to the position suitable for driving-out, and copying work is carried-out in this state. After copying is completed, the pushing-up piece 28 is lowered to the original position, and then the middle plate 54 is returned to the original position, and then the cassette 54 is pulled-out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feeding device for a copying machine, and in particular, it improves the insertion direction of the paper feeding power center and reduces the occurrence of noise and malfunctions. This invention relates to a paper feeding device for a copying machine.

[Prior art]

Generally, in a copying machine, paper is conveyed in the left-right direction inside the copying machine, and the paper feed force cent is such that the insertion direction and paper feeding direction are the same direction. Therefore, conventional copying machines are configured so that the paper feed cassette can be inserted from either the left or right direction of the copying machine.

However, with such conventional machines, space must be secured on the side of the copying machine to insert the paper feed cassette, which increases the space required to install the copying machine. Therefore, it has the drawback that the place where it can be installed is restricted, and it is very difficult to operate because it has to be inserted and removed from the sides of the copying machine, that is, from the left and right, making it difficult to copy. This has the disadvantage that the work is complicated.

Furthermore, when the paper feed center is inserted, the middle plate of the paper feed force center is raised by the middle plate push-up lever so that the upper surface of the topmost sheet of the paper stack comes into contact with the paper feed roller. There is a type that moves the middle plate up and down by operating a push-up lever, but the former type has the disadvantage that the mechanism is complicated and that it becomes heavy due to the heavy load applied when inserting the paper feed cassette. However, the latter type had the disadvantage that it generated noise every time paper was fed, was noisy, and was prone to failure.

[Purpose of the invention]

The present invention eliminates the drawbacks of the prior art as described above, and allows the paper feed center to be inserted from the front of the copier, thereby eliminating the need for the front side of the copier originally reserved for operating the copier. This makes it possible to use space effectively to reduce the installation space of the copying machine, and also improves operability when attaching and detaching the paper feeder, and prevents malfunctions and noise. It is an object of the present invention to provide a paper feeding device for a copying machine that can be reduced in size.

[Structure of the invention]

The present invention is configured such that a paper feed cassette is loaded from the front of a copying machine in which paper is conveyed in the left-right direction, and
It has a configuration in which a middle plate push-up mechanism for pushing up the middle plate of the paper feed force center is provided.

[Embodiments of the invention]

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows a copying machine equipped with a paper feeding device according to the present invention, and this copying machine is equipped with a charging corona around a photosensitive drum 1, which is an image carrier, for charging the surface of the photosensitive drum 1. a discharger 2; a focusing light transmitter (Selfoc lens) 4 that forms an electrostatic latent image by forming an image on the surface of a photoreceptor drum 1 by reflecting light from a document surface (not shown) irradiated by a lamp 3; , a developer 5 for developing an electrostatic latent image on the surface of the photoreceptor drum 1, and a transfer corona discharger 6 for transferring the toner image developed by the developer 5 from the surface of the photoreceptor drum 1 to paper. A separation corona discharger 7 separates the paper onto which the toner image has been transferred by the transfer corona discharger 6 from the surface of the photoreceptor drum 1, and a separation corona discharger 7 cleans the surface of the photoreceptor drum 1 after the toner image has been separated. Cleaning devices 8 are disposed close to the photoreceptor drum 1 and sequentially along the front in the rotational direction thereof.

On the other hand, when the paper feed cassette 50 is inserted, it is in the state shown in FIG. The paper passes through the U-turn roller 12, the nip roller 14, the loop section paper guide plate 17, the secondary paper feed roller (registration roller) 15, and is guided to the transfer section through the gap between the paper guide plate 19 and the transfer opening paper guide plate 18. hand,
A toner image is transferred from the surface of the photoreceptor drum 1 by a transfer corona discharger 6, then separated from the surface of the photoreceptor drum 1 by a separation corona discharger 7, and transferred by a fixing device 10 via a paper guide plate 9. After the image is fixed, the paper ejection roller 16
It is designed to be discharged out of the device by
Copying is also possible when only one sheet of paper is fed by the sheet feeding guide plate 20 without feeding the sheet from the paper feeding cassette 50.

This copying machine has a paper feed cassette 5 on the front as shown in Figure 6.
A storage chamber for a paper feed cassette 50 is formed inside the insertion port 34, and a rear wall 2 of the storage chamber is formed.
6 is provided with a middle plate push-up mechanism 35 for pushing up the middle plate pivotably mounted in the paper feed cassette 50 so as to be swingable in the vertical direction when the paper feed force center 50 is inserted. There is. As shown in FIGS. 2 to 5, this middle plate push-down mechanism 35 consists of a rotary plate 2 with a bottle 25 protruding from an eccentric position on a back wall 26.
2 is rotatably connected to a drive shaft 36 passing through the back wall 26, and furthermore, a pair of levers each having one end pivotally connected to the back wall 26 can swing in the vertical direction. members 23, 24 are provided, one of the lever members 23 being located above the pin 25 of the rotating plate 22;
Further, a spring 30, which is a biasing member, is stretched between the other ends of both lever members 23,24. Furthermore, on the back wall 26 there is a protrusion 2 that restricts the upper limit position of the other lever member 24.
7 is provided.

A push-up piece 28 facing the lower opening 29 of the paper feed cassette 50 is integrally connected to the other lever member 24 .

In addition, 31 is a document mounting table provided on the top surface of the copying machine;
Reference numeral 2 represents an operation section, and reference numeral 33 represents a paper discharge tray provided on the left side of the copying machine.

Next, the operation of the above will be explained.

First, insert the paper feed power cent 50 from the front of the copying machine into the insertion slot 341.
When inserted, the push-up piece 28 of the middle plate push-up mechanism 35
Since the rotating plate 22 is in the state shown by the solid line in FIG. 4, the other lever member 24 is in the state shown by the solid line in FIG. Since it is located below the movement range, the paper feed force center 50 can be smoothly inserted and positioned.

After doing so, when the start button of the operation unit 32 is pressed to start the copying machine, this activation signal causes the drive shaft 21 to be rotated 180 degrees from the state shown in FIG. 4 by the drive tA (not shown) to one point. Rotate to the state shown by the chain line.

As the rotating plate 22 rotates, the one lever member 2
3 is raised by a bottle 25 protruding from the rotary plate 22 and swings to the state shown by the dashed line in FIG. The lever swings upward via the spring 30 and enters the state shown by the dashed line. This other lever member 24 has a push-up piece 28
are integrally connected, the push-up piece 28 also rises, protrudes from the lower opening 29 of the paper feed force center 50, raises the middle plate 54 of the paper feed cassette 50, and moves as shown in the fifth figure. let In this case, the other lever member 24
Since the upper limit position of is regulated by a protrusion 27 protruding from the back wall 26, the stack of sheets placed on the upper surface of the middle plate 54 can be moved to an optimal position. Thereafter, the paper feed roller 11 rotates in synchronization with the rotation of the photoreceptor drum 1 at a predetermined timing, whereby the paper fed out from the paper feed cassette 50 is conveyed in the left and right directions within the copying machine, and the original image is transferred. After being fixed, the image is discharged onto the paper discharge tray 33.

After the copying work is completed in this way, the operation section 32
When the start button is turned OFF, the drive shaft 21 is rotated by 180 degrees again by the drive source to reach the state shown by the solid line in FIG. The middle plate 54 is also in the state shown in FIG. 5, and there is no fear that it will get caught when the paper feed cassette 50 is pulled out.

FIG. 7 shows another embodiment of the present invention, in which the same members as in the previous embodiment are given the same numbers and their explanations will be omitted.

In this embodiment, retractable rail members 61 are arranged on both sides of the insertion slot 34 of the paper feed cassette 50, and a tray 62 is installed between the rail members 61. If the paper cassette 50 is placed on the top surface of the tray 62 and then pushed forward, the paper cassette 50 can be placed in the proper paper supply position. The middle plate pushing up mechanism 35 pushes up the middle plate 54 of the paper feed cassette 50.

In the embodiment described above, the upward U-shaped push-up piece 28 is integrally connected to the other lever member 24, and when the other lever member 24 rises, the push-up piece 28 rises and the middle plate 54 is lifted.
Although the configuration is such that the intermediate plate 54 is pushed up, the present invention is not limited to this, and the point is that the intermediate plate 54 may be configured to move up and down by a swinging lever member.

〔Effect of the invention〕

By configuring the invention as described above, the paper feed cassette can be inserted and removed using the space on the front side of the copying machine that is secured from the beginning for operating the copying machine. This eliminates the need to secure a space on the side of the copying machine for inserting a paper cassette, making it possible to further reduce the installation space of the copying machine.In addition, the operations of inserting and removing the paper cassette are easier to copy. Operability is greatly improved because it can be done in the same position as it is to be used, and since the center plate of the paper feed force center moves up and down the same number of times as the number of copying operations, noise generation is reduced and the occurrence of malfunctions is also reduced. In addition, it has excellent effects such as no load is applied when attaching and detaching the paper feeder, and the work of attaching and detaching the paper feeder can be done smoothly.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional front view showing an embodiment of the present invention;
Figure 2 is a cross-sectional plan view of the paper feed cassette insertion part, Figure 3 is a view taken along line m-m in Figure 2, and Figure 4 is I in Figure 2.
A view taken along the line V-IV, FIG. 5 is a diagram showing the relationship between the intermediate plate push-up mechanism and the intermediate plate of the paper feeding force center, FIG. 6 is a perspective view showing the external appearance of the one in FIG. 1, and FIG. FIG. 7 is a schematic perspective view showing another embodiment. 1-----One photosensitive drum 2-----One charging corona discharger 3--Lamp 4--Focusing light transmission body 5-
------1 Developing device 6 ------1 Transfer corona discharge device 7 --- Separation corona discharge device 8 --- Cleaning device 9 , 19 ------ Paper guide plate 10------ Constant fixing device 1 t---------Paper feed roller 12-----U-turn roller 13.14----Nip roller 15---- ---Secondary paper feed roller 16----- Paper ejection roller 17-----Loop section paper guider plate 18-m----
・-Transfer log guide plate 20------Single sheet feed guide plate 21---Drive shaft 22------Rotary plate 23.
24----1~-Lever 1 member 25----Pin 26
--------Back wall 27---～---Protrusion 28---
--Push-up piece 29---Ichinoseki mouth part 30---I---
-Spring 31--Original table 32--Operation unit 33--One discharge tray 34--Insertion slot 35--Middle plate push-up mechanism 50------
One paper feeding force cent 5t------One middle plate 5s, g6---Separation claw 58---Handle 61---One rail member 62
--------1-Rei

Claims (2)

[Claims] (1) The paper feed force center is configured to be installed from the front of the copying machine where paper is conveyed in the left-right direction, and a middle plate push-up mechanism is installed to push up the middle plate of the paper feed force center. Characteristic copying machine paper feed device. (2) The middle plate push-up mechanism is a push-up mechanism that is movable between an inoperative position below the movement range of the paper feed force center and an activated position that pushes up the middle plate of the paper feed force center. 2. A paper feeding device for a copying machine according to claim 1, wherein the push-up piece is in a depressed position when copying is in operation and in a lowered position when not in operation.