JPH0456969A - Electrostatic recording type image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image forming apparatus that uses an electrostatic recording method, and more specifically, to an image forming apparatus that can easily dispose of paper jams generated between a resist roller and a photoreceptor drum. The electrostatic recording type image forming device has a dark side.

(Prior Art) Electrostatic recording type image forming apparatuses using dry toner have problems due to the fact that members involved in electrostatic recording writing, such as gate rollers, transfer units, and fixing units, are disposed on the paper feed path. These members restrict the movement of the recording paper, and paper jams, that is, vapor jams, are likely to occur.

In order to deal with such paper jams, for example,
As seen in Japanese Patent No. 1-116363, a drawing having a so-called crocodile-type housing structure has been proposed, in which the apparatus can be divided into upper and lower halves with a nearly horizontal sheet feeding path as a boundary.

(Problems to be Solved by the Invention) Although such a device can easily handle vapor jams that occur on the open side, it is still difficult to deal with vapor jams that occur between the gate roller and the fixing device. Difficult to process.

In other words, when a vapor jam occurs between the gate roller and the fixing device, the recording paper is wavy between the gate roller and the fixing device, so grasp the left and right edges of the jammed paper near the center, and fix the leading edge of the paper. Unless the trailing edge of the recording paper is pulled out from the device and the gate roller at the same time, the interior of the printer will be contaminated with unfixed toner, making jam removal difficult.

The present invention was made in view of these problems, and its purpose is to make the rear end of the paper open when M is opened, and to pull out the paper as it is. To provide a new electrostatic recording type vertical blink that eliminates internal contamination due to unfixed toner adhesion and enables appropriate jam disposal even when the machine is in a state of disuse.

(Means for Solving the Problems) In order to solve such problems, in the present invention, a housing is constituted by a main body and a lid provided on the main body so as to be openable and closable, and the main body and the lid are separated. When the lid body is opened from the main body on the upstream side of the photoconductor drum when the surface is used as a printing path and the photoconductor drum is installed on one side and the transfer means is provided on the other side, the lid body is opened by a predetermined amount to create a gap. The pair of gate rollers forming the gate rollers are incorporated into the main body side or the lid side.

(Function) When the lid is opened when clearing a jam, the gate roller pair is moved relative to each other by M to form a gap, and the toner surface adhering to the recording paper only by electrostatic force is passed through this gap. It is possible to remove jams without staining the interior of the printer with unfixed toner.

(Example) The details of the present invention will be described below based on illustrated examples.

Fig. 1 shows an embodiment in which the present invention is applied to an electrostatic recording type vertical printer. In the figure, reference numeral 1 is the printer main body, and on the top thereof, there are two paper feed cassettes 2 and 3. are removably attached, and these cassette attachment parts are
A paper feed roller 5.6 is provided for feeding the recording paper in each cassette 2.3 to the paper transport path 4.

7 is a photosensitive unit that integrally incorporates a photosensitive drum 8, a developing device M9, a charging device H10, an erase device 11, and a cleaning device 2; 1 is removably provided.

Reference numeral 15 denotes a lid that covers the front surface of the printer main body with the paper conveyance path 16 as its boundary, and is attached to the main body 1 by a support shaft 17 at the lower end of the front surface so as to be openable and closable.

Reference numeral 20 in the figure indicates a pair of gate rollers provided on the lid 15, as shown in FIG.
In this way, the feed roller 21 is constantly connected to the driven roller 22 by the spring 24 attached to the support shaft 23, and the spring bearing attached to the shaft portion of the feed roller 21 via the member 25.
The elongated hole 28 of the gate roller guide plate 27 is pressed in the direction of arrow C by the gate roller pressing member 26, 26 (FIG. 3A) provided on the printer main body 1. It has a structure that allows it to slide and be fixed at a position where recording paper can be conveyed. On the other hand, the driven row 522
In this case, the spring receiver receives the biasing force of a spring 62 provided on the support shaft 61 via a member 63, and is pressed toward the recording paper conveyance path.

These feed rollers 2] and driven rollers 22 are provided with feed side paper guides 30 that are located on the respective roller sides from the contact surfaces of the feed rollers 21 and driven rollers 22 to form a certain gap.
and the driven paper guide 3] are integrally attached to each roller.

Reference numeral 33 denotes a printing surface pressing member that contacts the recording paper over as small an area as possible, and in this embodiment, it is constituted by a star-shaped roller. Reference numeral 35 denotes an arm for driving the printing surface pressing member 33, which is rotatably attached to the lid 15 by a rotating shaft 36, and one end of which is extended to a position opposite to the driven paper guide, where the star-shaped roller 33 is attached. is rotatably attached, and is constantly biased by a spring 37 in a direction to move the star-shaped row 533 away from the printing path 16, and the other end is roughly pressed by a pressing member 38 attached to the main body 1. It is configured as follows.

In this embodiment, when the lid 15 is closed as shown in FIG. Depending on whether the drive roller 21 or the spring 37
The gate roller guide plate 27 is slid through the elongated hole 28 of the gate roller guide plate 27, and is pressed against the driven roller 22. Further, the printing surface pressing member 33 is pressed by a pressing member 38 attached to the main body, and is in a state of being retracted from the printing path.

When a print command is output in this state, the paper feed cassette 2.
The recording paper No. 3 is transferred to the paper conveyance path 16 by the paper feed roller 5.6.
is sent to the gate roller 20 of. Gate roller 20
The feed roller 21 rotates by receiving power from the main body side, and works with the driven roller 22 to feed the recording paper to the photosensitive drum 8. The recording paper sent out from the gate roller 20 is guided by the feeding side paper guide 30 and the driven paper guide 31 and moves to the photosensitive drum 8 .
The toner image formed thereon is transferred and moved to the fixing device 18. At this stage of movement, the printing surface pressing member 33 is
Since it is retracted from the print path 16, it does not come into contact with the recording paper, and the recording paper will not be contaminated by toner that has adhered to it due to previous paper jam processing or scattering from developing snow.

On the other hand, if the leading edge of the recording paper gets caught in the fixing device M]8 and a vapor jam occurs between the fixing device 18 and the gate roller 20, when the lid 15 is opened, the lid will be removed as shown in FIG. 15 rotates around a support shaft 17 and prints along the printing path 16.
8 Open.

As a result, the feed roller 21 is released from the pressing force of the gate roller pressing members 26, 26, and is separated from the driven roller 22 by the urging force of the spring 24 attached to the support shaft 23, forming a gap (Fig. 2b). , FIG. 3b), at the same time, the arm 35 is also released from the pressure by the pressing member 38, and the printing surface pressing member 33 is pressed against the driven paper guide 31 by the biasing force of the spring 37, and the recording paper is pressed against the driven paper guide 31. They will be held at the gate.

In this state, if you grab the rear end of the recording paper and pull it out, the unfixed part of the recording paper from the photoconductor drum 8 to the fixing device [18] will be pressed by the printing surface pressing member 33, and the non-printing surface will be removed. is pulled out to the top while rubbing against the driven paper guide 31.

As a result, the pulled out recording paper has its non-printing side turned to the driven
- roller 22, and is pulled out with a gap between the unfixed toner surface and the feed roller. At this drawing stage, since the printing surface pressing member 33 is constituted by a star-shaped roller, its contact area is extremely small, and the amount of toner adhering to it can be suppressed to an extremely small amount.

FIG. 5 shows the second embodiment, and the reference numeral 4 in the figure shows the second embodiment.
An arm o is rotatably attached to a support shaft 41, and is biased by a spring 42 so that one end is always pressed against the driven roller 22. One end of this arm can come into contact with a pressing member (not shown) provided in the main body drawing,
A rotating shaft 44 of the feed roller 43 is rotatably attached, and a printing surface pressing member is attached to the other end.

A feeding side paper guide 46 and a driven paper guide 31 are attached to the feeding roller 43 and the driven roller 22, respectively.

In this embodiment, when the lid body 15 (FIG. 1) is closed, the lever 4o is pressed by the pressing member inside the main body and is moved around the support shaft 4] against the spring 42 by the reference symbol E in the figure. Rotate in the direction of. As a result, the feed roller 43 comes into contact with the driven roller 22, and the printing surface pressing member 45 is retracted from the printing path. As a result, the paper feed cassette 2.
The recording paper supplied from 3 is sandwiched between the feed roller 43 and the driven roller 22, and sent out toward the photosensitive drum 8. Since the printing surface pressing member 45 is retracted from the printing path 16, the recording paper is not contaminated by the printing surface pressing member 45.

On the other hand, if a vapor jam occurs in the printing path, when the lid is opened, the lever 40 is no longer pressed by the pressing member, so the lever 40 is rotated in the direction of symbol F in the figure by the biasing force of the spring 42. . As a result, the drive roller 4
3 is pulled by 111 m from the driven roller 22, and the printing surface pressing member 45 is pressed against the driven paper guide 31.

In this state, if you grab the rear end of the recording paper and pull it out, the unfixed part of the recording paper from the photoreceptor drum 8 to the fixing drawing 18 will be pressed by the printing surface pressing member 45, and the non-printing surface will be removed. is pulled out to the top while rubbing against the driven paper guide 31.

As a result, the unprinted recording paper is brought into contact with the driven roller 22 with its non-printing surface, and is pulled out with a gap between the unfixed toner surface and the feed roller 43.

According to this embodiment, the feed roller 44 and the printing surface pressing member 45 can be moved forward and backward by the same lever 40, and the structure of the mechanism can be simplified.

FIGS. 6(a) and 6(b) show the third part of the printing surface pressing member of the present invention.
In this figure, reference numerals 50 and 51 denote a feed roller and a driven roller that constitute a gate roller. It is urged in a direction away from the driven row 551 side by a spring 55, and is pressed in the direction indicated by reference numeral C in the figure by a pressing member (not shown) provided on the main body side. Further, a feed side paper guide 56 is provided on the rotating shaft of the feed roller 50, and the recording paper is guided by a feed side paper guide 57 provided on the driven roller 51.

58. 58 is a printing surface pressing member formed in a comb tooth shape,
It is fixed to the side plate 52, and its tip 58a faces the driven paper guide 57 with a certain gap.

In this embodiment, when the lid [5] is closed, the feed roller 5o is pressed against the driven roller [5] against the spring 55.
Further, the feeding side paper guide 56 also approaches the driven paper guide 57 and moves more roughly toward the driven paper guide 57 than the tip 58a of the printing surface pressing member 58, thereby forming a gap necessary for transporting the recording paper once. do.

In this state, when the recording paper is sent out from the cassette 2.3, the recording paper is sent out to the photosensitive drum 8 by the driving roller 50 and the driven roller 51 while being guided by the paper guides 56, 57. Therefore, even if toner adheres to the printing surface pressing member 58, the printing surface will not be contaminated.

If a vapor jam occurs in the recording paper in the printing path, when the lid 15 is opened, the feeding roller 50 is released from the pressing force from the main body and is separated from the driven roller 51 by the biasing force of the spring 55. Further, the feed side paper guide 56 provided therein also retreats from the driven paper guide 57 (sixth
Figure b).

In this state, if you grab the trailing edge of the recording paper and pull it out, the portion of the recording paper that extends from the photoreceptor drum 8 to the fixing device 18 will have its non-printing side in contact with the driven paper guide 57, and the unfixed side. The tip 58a of the printing surface pressing member 58
It is pulled out to the top while making contact with the

According to this embodiment, the printing surface pressing member can be composed of only stationary members, and reliability can be improved.

In the above-described embodiments, the printing surface contact portion of the printing surface pressing member is formed of a star-shaped roller or a comb-shaped member, but the same effect can be obtained by using a disc roller, a brush, etc. it is obvious.

In addition, although this embodiment has been explained using a case where it is applied to a vertical type printer, a horizontal type printer, a copying machine, and a facsimile machine using an electrostatic photographic process can also have the same effect when applied to a facsimile machine. That is clear.

(Effects of the Invention) As described above, according to the present invention, the casing is configured by the main body and the lid provided on the main body so as to be openable and closable, and
The printing path is formed by dividing the main body and the lid into a photosensitive drum on one side and a transfer means on the other side,
When the lid is opened from the main body on the upstream side of the photoreceptor drum, a pair of gate rollers is installed in the main body or the lid to form a circumferential gap by a predetermined amount rMo, so that the lid can When the body is opened, the gate roller pair can be separated from each other to form KF4a, and the toner surface that is attached to the recording paper only by electrostatic force is moved through this gap, and the inside of the blink is undefined. Jam removal can be performed without contaminating the toner.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the device showing an embodiment of the present invention with the lid closed, and FIGS. 2 and 3 are a top view and a side view, respectively, showing the structure near the gate roller of the same device. , the same figure (
Figure 4 shows the original one with the lid closed, Figure 4 shows the original one with the lid opened, and Figure 4 shows the original one with the lid closed. FIG. 5 is a side view of the vicinity of the gate roller showing another embodiment of the present invention, and FIGS. FIG. 7 is a side view showing the structure near the gate roller showing another embodiment with the lid closed and with the lid opened. 1...Main body 2.3...Paper feed cassette 8...Photosensitive drum 11...Transfer device 1
5... Lid body 16... Mark II route 20
...Gate roller pair 21...Feed roller 21...Followed roller 3
0...Feeding opening guide 31...Followed paper guide 33...Printing surface pressing member 51...Printing surface pressing member Applicant Seiko Epson Corporation Representative Patent attorney Katsuhiko Kimura Nishikawa Counterfeit cure figure 3 figure

Claims (2)

[Claims] (1) A housing is constituted by a main body and a lid provided on the main body so as to be openable and closable, and a photosensitive drum is provided on one side, and a transfer means is provided on the other, with the dividing surface of the main body and the lid serving as a printing path. In the electrostatic recording device, a pair of gate rollers are installed on the main body side or the lid side, and the gate rollers are separated by a predetermined amount to form a gap when the lid body is opened from the main body on the upstream side of the photosensitive drum. type image forming device. (2) It is located near the gate roller pair and on the printing surface side of the paper conveyance path, and when the lid is closed, it is relatively retracted to a position where it does not come into contact with the recording paper, and the lid Claim 1 characterized in that a printing surface pressing member is provided at a position as close as possible to the recording paper when the body is opened.
The electrostatic recording type image forming apparatus described above.