JPS6232469A - Electrostatic recorder - Google Patents

Abstract

PURPOSE:To reserve a considerable space for the jam processing with one operation of a manual lever by providing an interlocking mechanism which separates a transfer part from an image carrier in accordance with a fixing device leading-out operation and releases pressing between a fixing roll and a pressing roll. CONSTITUTION:When a grip 26 in the outside end part of a manual lever 23 is raised in case of the jam processing, a shaft rod 21 is rotated, and a pressing lever 18 is moved down against a spring 20 by a long side part of a cam 25 fixed to the shaft rod 21. Simultaneously with separation of a pressing roll 15 from a fixing roll 14, a hook 27a of a holding means 27 which holds a fixing device 7 in the home position by a projecting piece 30 in the other end side of the manual lever 23 is disengaged from a projection 28. When the manual lever 23 is raised as it is and is pulled to this side in this state, the fixing device 7 is led out of a device body in the eject direction of a recording paper. When the manual lever 23 is returned to the original position, the pressing lever 18 is returned by the restoring force of the spring 20, and the pressing roll 15 is pressed against the fixing roll 14.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of simultaneously pulling out the fixing device, separating the pressure roller from the fixing roller, and separating the transfer section from the image carrier with a single lever operation. This invention relates to an electrostatic recording device.

[Background of the invention]

Electrostatic recording devices include electronic copying machines, laser printers, and LEDs.
Widely used as printers, etc. An example of an electronic copying machine, that is, a copying device, will be explained below.

The copying machine shines a beam of light from a light source onto the surface of the document on the document table.
Light reflected from the document surface is irradiated onto the photoreceptor drum via a reflection mirror to form an electrostatic latent image, which is developed by a developing section, and then the toner image is transferred onto a supplied recording paper at a suitable timing.

After static elimination and/or separation, the recording paper is discharged through a fixing device. The transfer unit, photoconductor drum, and fixing roller and pressure roller in the fixing device used in such copying devices can be released from the pressure bond in order to make it easier to remove jammed recording paper during paper feeding. In the case of a copying machine, a separating mechanism 1 between the transfer section and the photosensitive drum is used, for example, a separating mechanism 1 between the photosensitive drum and the conveyance section is disclosed in Japanese Patent Application Laid-open No. 52-77733, Japanese Patent Application Laid-Open No. 52-7544.
Publication No. 4, Japanese Unexamined Patent Publication No. 1983-92745, Japanese Utility Model Publication No. 1983
According to Japanese Patent No. 108451, the release mechanisms for the fixing roller and the pressure roller in the fixing device were separate, which made the operation troublesome and it was not possible to secure a large space for clearing jams.

[Purpose of the invention]

The present invention is intended to solve the above problems, and has a simple configuration that allows the fixing device to be pulled out of the machine and the pressure roller to be released from the fixing roller.

Another object of the present invention is to provide an electrostatic recording device in which a transfer section can be released from a photosensitive drum as an image carrier by operating only one lever.

[Structure of the invention]

To achieve the above object, the present invention provides an electrostatic recording device in which a fixing device is provided so as to be pulled out from a predetermined operating position, in which a transfer section is separated from an image carrier in conjunction with the operation of pulling out the fixing device.

The structure includes an interlocking mechanism that releases the pressure between the fixing roller and the pressure roller.

〔Example〕

Next, the present invention will be described based on an embodiment shown in the accompanying drawings.

Reference numeral 1 denotes a main body of the copying apparatus (hereinafter referred to as 1 main body), 2 a photoreceptor drum (@!carrier), and 3 a transfer pole 3a that transfers the toner image formed on the photoreceptor drum 2 onto recording paper (not shown).
and a transfer unit including a separation pole 3b, and 4 is a transport unit. The transfer unit 3 is supported by a movable frame 6 having a fulcrum 5 on the downstream side of the photosensitive drum 2 in the recording paper conveyance direction.

Further, the transport unit 7 4 is fixed to the base side of the movable frame 6.

A fixing device 7 fixes the image transferred to the recording paper, and the fixing device 7 is attached to the bottom of the main body 1 via a sliding means 8 so that it can be pulled out in the direction of discharge of the recording paper (in the direction of the arrow). ing. The fixing device 7 has a hanging plate 11 whose fixed position is a hanging plate 11 having a through hole that can be fitted into a positioning bin 10 provided horizontally protruding from a rising plate 9 fixed to the bottom surface of the main body 1 in the sliding direction of the fixing device 7. and bifurcated side plates 13 that can engage with positioning pins 12 provided opposite to both side walls of the main body 1.

The fixing device 7 includes a fixing roller 14 and a pressure roller 15 opposed to the lower surface of the fixing roller 14, and the pressure roller 15 is mounted on both ends of a support shaft 16 with bearings 17 as shown in the third figure. 1M supported by the crimp lever 18 through
The pressure lever 18 is rotatably mounted between the side frames of the fixing device 7 via a shaft 19, and is biased by a spring 20 in a direction to press the pressure roller 15 onto the fixing roller 14.

Reference numeral 21 denotes a shaft rod that is inserted through a recess 22 on the upper edge of the crimp lever 18, and a manual lever 23 is fixed to the shaft rod 21, and a cam 25 that slides into contact with a protrusion 24 provided on the crimp lever 18. When the 0 manual lever 23 to which is fixed is rotated in the direction of the arrow as shown by the two-dot chain line in FIG. Rotate the cam 25.

The long side of the cam 25 holds the crimp lever 18 against the spring 2.
0, it can be moved downward as shown in the fourth figure. That is, the pressure roller 15 can be separated from the fixing roller 14.

Reference numeral 27 denotes a holding means for holding the fixing device 7 in its fixed position, and the holding means 27 is constituted by a rotating lever 27b having a hook 27a that engages with a protrusion 28 provided on the lower surface of the fixing device 7. . The rotating lever 27a of the holding means 27 is normally biased to rotate in the direction in which the hook 27a engages with the protrusion 28 by the action of the spring 29, but when the manual lever 23 is rotated as described above. At this time, the protrusion 30 provided on the other end 1123b of the manual lever 23 allows the hook 27a to come off. Therefore 9 manual lever 2
If the fuser 3 is pulled in the above-mentioned state as shown in the second figure, the fixing device 7 will be pulled out.

Reference numeral 31 denotes an inclined cam that is provided integrally with the fixing device 7. The inclined cam 31 has a slope that is higher at the front and lower at the rear with respect to the direction in which the fixing device 7 is pulled out. The free end side of the movable frame 6 that supported the transfer section 3 and the transport unit 4 is placed. Then, the movable body frame 6
When the fixing device 7 is housed in the normal position, it is held by the high part of the inclined cam 31 as shown in the first figure and is in the transfer position, but when the fixing device 7 is pulled out.

As shown in the second figure, the free end side descends according to the inclination of the inclined cam 31. That is, the transfer section 3 and the conveyance unit 4 are spaced apart from the photoreceptor drum 2.

Next, the operation of the above embodiment will be explained.
6 upward, the shaft 21 rotates and the cough shaft 2
The pressure lever 18 moves downward against the spring 20 by the long side of the cam 25 fixed to the cam 25, and at the same time, the pressure roller 15 is separated from the fixing roller 14, and at the same time the protrusion 30 on the other end of the manual lever 23 fixes the pressure roller 15. The lip 27a of the holding means 27 that was holding the container 7 in place is removed from the protrusion 28. Then, by pulling the second manual lever 23 toward you while keeping it lifted as described above, the fixing device 7 will be pulled out of the main body 1 along the recording paper ejection direction. This fixing device 7 is integrally provided with an inclined cam 31, and the inclined cam 31 has a movable frame 6 that supports the transfer section 3 and the first general feeding unit 4.
Because it is placed on the free end side of.

When the fixing device 7 is pulled out, the free end side of the movable frame 6 is lowered, and the transfer section 3 and the conveyance unit 4 are separated from the photoreceptor drum 2. As a result, the distance between the photoreceptor drum and the fixing device is widened, and the distance between the fixing roller and the pressure roller and between the photoreceptor drum and the transfer section and conveyance unit is also increased. that time.

During normal copying, the recording paper P is being transported as shown in Figure 1, but if the recording paper P becomes jammed during IM transport and the transport unit 4 is separated, the recording paper P will be transported as shown in Figure 2. It can be easily taken out.

After clearing the jam, when returning the fixing device 7, return the manual lever 23 to the old position. The pressure lever 18, which had been pressed down by the cam 25, returns with the restoring force of the spring 20, and the pressure roller 15 is moved back to the fixing roller 14. Crimp. After that, when the fixing device 7 is pushed into the main body 1, the through hole in the hanging plate 11 of the fixing device 7 engages with the positioning pin 10, and the bifurcated member 13 engages with the positioning pin 12 on the side wall, so that the localization 1 is secured. , and is completely held in the main body 1 by the action of the holding means 27.

Note that the present invention is not limited to the above-mentioned embodiments; 1. For example, the fixing roller may be separated by a groove cam or a cam surface provided in the drawing direction when the fixing device 7 is pulled out; 1 A known click mechanism or a locking and releasing mechanism using a push button may be used instead of a stop mechanism using a manual lever.Also, a manual lever 23
is provided so as to protrude outward from the main body 1 of the copying machine.
For example, it is of course possible to open the front cover (not shown) of the copying apparatus 1 and pull out the fixing device and the conveying section outward by using a manual lever provided inside the main body.

〔Effect of the invention〕

As described above, in an electrostatic recording device in which a fixing device is provided so that it can be pulled out from a predetermined operating position, the transfer section is separated from the image carrier in conjunction with the operation of pulling out the fixing device, and the fixing roller is pressed against the fixing roller. It features an interlocking mechanism that releases the pressure on the rollers, so with one operation of the two manual levers, the pressure on the fuser is released, the fuser is moved, and the transfer section is separated from the photoreceptor drum, making it possible to clear jams. It becomes possible to secure a large amount of space.

Also, when you pull out the fuser, the gap between the rollers is released at the same time, so you need to clean the rollers.

It has various excellent effects such as easy replacement and repair.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention, and FIG. 1 is a sectional view of the fixing device held in a fixed position. Figure 2 is a sectional view when the fuser is pulled out, Figure 13 is a perspective view showing the mechanism for pressing and releasing the fuser roller and pressure roller, and Figure 4 is a sectional view showing the mechanism for pressing and releasing the fuser roller and pressure roller. It is a side view when it releases. 2-Photosensitive drum (image carrier) 3--Transfer section 4--Transport unit 6--
・Movable frame 7-・Fuser 8-...Sliding means
14. Fixed roller 15. - Pressure roller 23
- Manual lever 25 - Cam 26 - - Handle 2
7...-Holding means 28--Protrusion 30--Protrusion Patent Applicant Konishiroku Photo Industry Co., Ltd. Figure 1

Claims (1)

[Claims] In an electrostatic recording device in which a fixing device is provided so that it can be pulled out from a predetermined operating position, an interlocking mechanism that separates a transfer section from an image carrier and releases pressure between a fixing roller and a pressure roller in conjunction with the operation of pulling out the fixing device. An electrostatic recording device characterized by being provided with.