JPS61287639A - Recording device - Google Patents

Abstract

PURPOSE:To make a sheet of recording paper so as to be unleft in the inside of a separation mechanism or a cassette housing chamber at the time of taking a cassette out, by installing a return mechanism which pushes back the recording paper remaining at the paper separation mechanism to a cassette direction in a way of interlocking with movement at a time when the paper feed cassette is taken out. CONSTITUTION:In the case where a paper feed cassette is taken out when recording paper 8 is pinched and left behind between a paper feed roller 9 and a separation belt 41, if this paper feed cassette 7 is pulled out, a pressing rib 7a is retracted so that first a second separation base 37 rotates clockwise by dint of a return spring. Therefore, return claws 38 and 39 is pressed by a pin 45 piercing through long holes 38a and 39a and rotates clockwise centering on a pin 40, pushing back the recording paper 8 to the inside of the paper feed cassette 7. Afterward, if the paper feed cassette 7 is pulled out further, a first separation base 35 rotates clockwise and retracts, so that the recording paper 8 hitches on the separation belt 41, thus it comes to nothing to be left behind.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a recording apparatus, and particularly to an improvement in a cut sheet feeding system.

[Background of the invention]

The paper feeding system of a recording device using an electrophotographic printing process, as described in Japanese Utility Model Application Publication No. 59-41361, inserts a paper feeding cassette containing recording paper (cut sheets) into the main body of the device. It is configured to extract the recording paper from the leading end in the insertion direction and send it to the printing process mechanism. In a recording device that employs such a paper feeding system, if the main body of the device is made smaller, the paper feeding cassette cannot be housed in its entirety within the main body due to the relationship between the recording paper extracting mechanism and the printing process position. The rear end of the paper cassette protrudes outside the main body of the apparatus. Therefore, even if the main body of the device is made smaller, the effect of reducing the occupied floor space is small.

In response, a small-sized recording apparatus has been proposed in which the entire paper feed cassette is inserted into the apparatus main body, and the recording paper is extracted from the rear end in the insertion direction and sent to the printing process mechanism. However, in this recording device, there is a paper separation mechanism following the recording paper extracting mechanism, and when the paper feed cassette is removed while the recording paper left by the separation action is in this paper separation mechanism,
There is a problem in that the recording paper is left behind in the paper separation mechanism or the paper feed cassette storage chamber.

This phenomenon will be specifically explained with reference to FIGS. 5 to 9.

FIG. 5 is a longitudinal sectional side view of this recording device. Device body 1
At the center of the photosensitive drum 2 and a charger 3 arranged around the photosensitive drum 2. Exposure device 4. There is an electrophotographic printing process mechanism equipped with a developer 5 and a cleaning device 6. The main body 1 of the apparatus is constructed such that the left side in FIG. 5 serves as an operating side, and a paper feed cassette 7 for cut sheets is removably inserted from this operating side along the bottom surface of the main body. This paper feed cassette 7 is inserted so that the entire paper is accommodated in the main body, and the recording paper 8 accommodated in this paper feed cassette 7VC is extracted by a paper feed roller 9 from the rear end in the insertion direction of the cassette, and the paper It is reversed by the guides 10 and 11 and stopped when it comes into contact with the registration rollers 12. Registration roller 12
is used to match the timing of the printing process and paper feeding.
When the recording paper 8 conveyed by the rotation of the registration rollers 12 comes into contact with the photosensitive drum 2, the toner image on the photosensitive drum 2 is transferred by the action of a transfer electric field from the transfer device 13. The recording paper 8 onto which the toner image has been transferred is transferred to the fixing roller 214
The toner image is heated and fixed as it passes through the paper guide 1.
5.16, the paper is reversed again and discharged by the discharge roller 17 onto the paper discharge tray 18 on the upper surface of the main body.

This recording device has the following features: (a) Since the paper feed cassette 7 is entirely housed in the device main body 1, and the paper output tray 18 is located on the top surface of the device main body 1, the floor space occupied by the device is small. Sh.

(b) Recording paper is ejected face-down with the print side facing downward, so page alignment is automatically performed.

(c) Since the operation of attaching and detaching the paper feed cassette 7 and the removal of ejected paper can be performed from the same operation side, there is an advantage of good operability.

However, in this recording apparatus, as described above, there are cases where the recording paper is left behind inside the main body when the paper feed cassette 7 is taken out, and this phenomenon will be explained below.

6 to 9 are detailed views of the paper feeding section, in which side plates 1b are attached to both sides of the base 1a of the main body 1. The paper feed roller 9 is fixed to a shaft 20, rotatably supported between the side plates 1b, and rotationally controlled by a drive mechanism (not shown). The paper guide 10° 11 is attached to a guide base 21, and this guide base 21 is connected to the side plate 1b by a shaft 22.
Since it is rotatably attached to the holder, in the free state it is rotated clockwise by the spring 24 until it comes into contact with the stopper 23 (see FIG. 7). A separation base 26 is attached to the guide base 21 with screws 25, and when the paper feed cassette 7 is inserted, the pressure ribs 7a of the paper feed cassette 7 push the separation base 26 and the guide base 21 counterclockwise. An actuating roller 27 that rotates is rotatably attached to the tip of the separation base 26 by a bin 281C. A separation belt 29 is further stretched on the separation base 26 with tension applied by a spring 30.1 When the paper feed cassette 7 is inserted into the main body of the apparatus and positioned by the stopper 1c, the separation belt 29 is suspended. It comes into contact with the paper feed roller 9 to form a paper separation mechanism.

The rear end of the cassette base 7b on which the recording paper 8 is placed in the paper cassette 7 is given an upward force by a spring 7C, and when the paper cassette 7 is inserted into the main body of the apparatus, Then, the cassette base 7b is pushed up to press the rear end of the recording paper 8 against the paper feed row 9. Guide rollers 7d are provided on both sides of the cassette base 7b, and when the paper feed cassette 7 is pulled out, the guide rollers 7d are attached to the roller guides 31 provided on the side plate 1b.
The cassette base 7b is pressed down and latched by a latch mechanism (not shown). Note that this latch is released when the paper feed cassette is inserted.

In the above configuration, as shown in FIG.
When the paper feed roller 9 rotates while the recording paper 8 is inserted into the main body 1 of the apparatus, the recording paper 8 is extracted and sent between the paper feed roller 9 and the separation belt 29. When two sheets of recording paper 8 are extracted, one of them is separated between them and sent to the electrophotographic printing process mechanism through paper guides 10 and 11.

The paper feed cassette 7 is pulled out as shown in FIG.
Along with this, the cassette base 7b is pushed down, and the guide base 21 is further rotated clockwise, so that the paper guides 10, 11, the separation pace 261, the separation belt 31, and the actuating roller 27 move into the attachment/detachment path of the paper feed cassette 7. Evacuate outside.

By the way, when feeding paper just before taking out paper cassette 7,
When the sheets of recording paper 8 are extracted and one of them is separated between the paper feed roller 9 and the separation belt 29 and remains here as shown in FIG. 8, as shown in FIG. When you pull out the paper cassette 7.

This recording paper 8 is pushed up along the separation belt 29 and cannot return into the paper feed cassette 7.

Therefore, even after the paper feed cassette 7 is removed, the recording paper 8 remains in the paper separation mechanism in the main body 1 of the apparatus or in the paper feed cassette storage chamber.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to prevent recording paper from remaining in the paper separation mechanism or the paper cassette storage chamber when the paper cassette is removed from the main body of the apparatus.

[Summary of the invention]

The present invention is characterized in that a return mechanism is provided that pushes the recording paper remaining in the paper separation mechanism back toward the paper feed cassette in conjunction with the movement of the paper feed cassette when the paper feed cassette is removed.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 2 is a vertical sectional side view of the paper separation mechanism and return mechanism.

FIG. 3 is an exploded perspective view thereof.

A second separation base 37 is swingably attached to the inside of the first separation base 35 by means of a bin 36.
Above the first separation base 35 is a second separation base 37.
A stopper 35a is provided to restrict counterclockwise rotation. The return claws 38 and 39 are operated by the bottle 40 to
The separation base 35 is rotatably provided on both outer sides of the distal end portion of the separation base 35.

Bent portion 3 formed at the tip of the second separation base 37
7a is in contact with one end of the separation belt 41, and the fixed silver 42
Fixed by The other end of this separation belt 41 is installed by winding around a belt roller 43 that is locked in a notch 37b formed in the second separation base 37, and a tension is stretched between the locking holes 37c and 41a. Tension is provided by a spring 44. A bin 45 provided at the tip of the second separation base 37 passes through elongated holes 38a and 39a formed in the return claws 38 and 39, and holds actuating rollers 46 and 47 on the outside thereof. The return spring 48 is wound around the bin 40 and has one end engaged with the bin 36 and the other end engaged with the bin 45, thereby causing the second separation base 37 to rotate clockwise about the bin 36. power is given. In addition, 49
~55 is an E ring.

Then, as shown in FIG. 4, the first separation base 35 is attached to the guide base 21 with screws 25.

The spring force of the return spring 48 is set to be stronger than the spring force of the return spring 24, and the spring force of the return spring 48 is set to be stronger than the spring force of the return spring 48.
In order to regulate the posture of the guide base 21, a stopper 56 is provided to limit the counterclockwise rotation angle of the guide base 21. In addition, in FIG. 4, the paper guide 10. The illustration of 1.1 was omitted.

In the above configuration, when feeding paper, the pressing lip 7a of the paper feeding cassette 7 pushes the actuating rollers 46, 47, so that the guide base 21 and the first separation base 35 are rotated counterclockwise until they come into contact with the stopper 56. , furthermore the second
The separation base 37 is also rotated counterclockwise until it comes into contact with the stopper 35a. Therefore, the separation belt 41 is brought into contact with the paper feed roller 9, and the return claws 38, 39 are rotated counterclockwise around the bin 40 to be in the state shown in FIGS. 2 and 4. Therefore, the recording paper 8 extracted by the paper feed roller 9 passes between the paper feed row 29 and the separation belt 41, and even if two sheets are extracted, the recording paper 8 is separated into one sheet and sent to the electrophotographic printing process.

As shown in FIG. 4, when the paper feed cassette 7 is removed when the recording paper 8 remains sandwiched between the paper feed roller 9 and the separation belt 410, the paper feed cassette 7 is removed from the paper feed cassette 7 as shown in FIG. When pulled out as shown, first, the second separation pace 37 is rotated clockwise by the return spring 48 because the pressing lip 7a retreats. Therefore, the return claws 38 and 39 are pushed by pins 45 passing through their elongated holes 38a and 39a, rotate clockwise around the bin 40, and push the recording paper 8 back into the paper feed cassette 7. Thereafter, when the paper feed cassette 7 is further pulled out, the first separation base 35 rotates clockwise and retreats, so that the recording paper 8 is no longer caught on the separation belt 41 and left behind.

〔Effect of the invention〕

The present invention provides a return mechanism that pushes the recording paper remaining in the paper separation mechanism back toward the paper cassette in conjunction with the movement of the paper cassette when the paper cassette is removed. The paper cassette will not remain in the paper cassette storage chamber.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention.
The figure is an explanatory diagram of the operation of the return mechanism, Figure 2 is a longitudinal cross-sectional side view of the paper feed section, Figure 3 is an exploded perspective view thereof, Figure 4 is an explanatory diagram of the operation of the paper separation mechanism, and Figure @5 is an explanatory diagram of the operation of the paper separation mechanism. FIG. 6 is a longitudinal sectional side view of a paper feeding section thereof, and FIGS. 7 to 9 are explanatory diagrams of its operation. 1... Device main body, 7... Paper feed cassette, 8... Recording paper. 9... Paper feed roller, 38, 39... Return claw, 41...
- Separation belt.

Claims (1)

[Claims] 1. A paper feed cassette for cut sheets that can be inserted into and taken out from the main body of the apparatus, a paper extraction mechanism that extracts recording paper from the rear end of the paper supply cassette in the insertion direction, and In a recording apparatus equipped with a paper separation mechanism that sends out one sheet to a printing process mechanism, the recording paper remaining in the paper separation mechanism is pushed back toward the paper feed cassette in conjunction with the movement when the paper feed cassette is taken out. A recording device characterized by being provided with a mechanism.