JPH04112267U - Transfer charger cover structure - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To provide a cover structure for a transfer charger that is low cost and has excellent operability and is used in a printing device that can handle multiple types of paper widths. [Structure] An image carrier 1 that forms and holds an image as a toner image, a transfer charger 3 that transfers the toner image formed on the image carrier 1 to a recording paper 2, and a charger that fits into holes at both ends of the recording paper. A paper feed tractor 4 that provides transport driving force, a paper width adjustment mechanism 5 that adjusts the width of the paper feed tractor 5 according to the width of the recording paper, and a transfer charger that supports the image when using narrow recording paper. A shielding film 6 for shielding from the body, folding guide members 71 and 72 for folding back so that both ends of the shielding film move in the same direction, and both ends of the shielding film being fixed between the folding guide members 71 and 72. , a slider 8 that operates in conjunction with the paper width adjustment mechanism 5 of the paper feed tractor 4.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a transfer charger used in printing devices that can handle multiple paper widths. Regarding bar structure.

0002 In recent years, electrophotographic recording methods and electrostatic recording methods, which enable high-speed and high-quality printing, have been used. Printing devices are becoming popular. This type of printing device prints an electrostatic image formed on an image carrier. The image is developed with toner, and the recording paper is conveyed between the image carrier and the transfer charger, and then transferred. The toner image on the image carrier is transferred to the recording paper by the charging effect of the photographic charger on the recording paper. is configured to be transferred to

0003 The width of the image carrier and transfer charger are usually the same to match the maximum width of recording paper that can be used. It is configured to a degree width. However, recording paper that is narrower than the image carrier or transfer charger , the transfer wire of the transfer charger in the area where there is no recording paper may be exposed. It tends to get dirty with toner, etc. Use wide recording paper to remove stains on this transfer wire. Since this causes uneven transfer when printing, it is desired to prevent this as much as possible.

0004

[Conventional technology]

FIG. 4 is a diagram showing a general configuration of a printing apparatus using an electrophotographic recording method. 1 in the figure is a photosensitive drum that holds an image, and this photosensitive drum rotates and the pre-charging device 91 uniformly charges the surface of the photosensitive drum, and exposing means 92 charges the surface of the photosensitive drum. By exposing the exposed area to light, the electric charge that was charged only on the exposed area disappears and static electricity is removed. A latent image is formed. After this, toner is attached to the electrostatic latent image in the developer 93 and developed. Visualize by imaging.

[0005] Then, the paper is transported by the paper feed tractor 4 at the same speed as the circumferential speed of the photosensitive drum 1. The visible image formed with toner on the photosensitive drum 1 is transferred to a transfer charger 3 onto a recording paper 2. Therefore, printing is performed by transferring. However, in this state, it is not possible to record The toner image printed on paper 2 is only attached to recording paper 2, so the image will be destroyed. It gets lost. To this end, the toner is melted by the fuser 94 and fixed on the recording paper. do.

[0006] On the other hand, the photosensitive drum 1 to which the toner image has been transferred is transferred by an AC static eliminator 95 in preparation for the next image formation. Remove static electricity to make it easier to remove residual toner that was not captured, and remove remaining toner with Fur Brush 96. Remove toner. Then, remove with cleaning blade 97 and fur brush 96. Completely remove the small amount of residual toner that could not be removed, and clean the surface of the photosensitive drum 1 with an optical static eliminator 98. Printing is performed by making the potential uniform and repeating the same process thereafter.

[0007] Figure 5 is a diagram showing the relationship between the transfer device and its peripheral equipment in such a device, and (a) is a diagram showing the relationship between the transfer device and its peripheral equipment. 4, and (b) is a view seen from the direction of arrow A shown in FIG. 4 (a). The recording paper 2 is placed under the paper feed tractor 4 shown in (a), and the paper feed is carried out in the pair shown in (b). Both ends are held by tractors 4a and 4b, guided by transfer guide 4c shown in (a), and shown in (b). As shown, the recording paper 2 passes between the photosensitive drum 1 and the transfer charger 3.

[0008] After that, the recording paper 2 is placed on the transfer guide 4d opposite to the transfer guide 4c shown in (a). As mentioned above, the paper feed tractor shown in (b) The paper feed tractor 4 is conveyed by

[0009] As shown in (b), the recording paper 2 is conveyed between the photosensitive drum 1 and the transfer charger 3. When the transfer charger 3 is operated at the time of transfer, the toner on the photosensitive drum 1 is transferred to the transfer charger. The image is transferred onto the recording paper 2 by the electrostatic adsorption force generated in step 3. Usually such a device has a structure that allows it to handle multiple types of recording paper to accommodate a wide variety of uses. It becomes. For this purpose, the paper feed tractor 4a is used for recording as shown by arrow C in the figure. It is movable in the width direction of the paper, so it can be set even if the width of the recording paper is different. It is now possible to

0010 However, as shown in (b), the recording paper 2 is larger than the photosensitive drum 1 and the transfer charger 3. If the width is narrow, there is no recording paper 2 between the photosensitive drum 1 and transfer charger 3. Paper portion B is generated. When this blank area B occurs, as shown in (a), the photosensitive drum The toner on 1 is attracted to the transfer wire 31 of the transfer charger 3 and adheres to the transfer wire 31. The sheet becomes dirty and the charging performance of the non-sheet portion B deteriorates.

[0011] After that, when you replace recording paper 2 with a wider one and perform a printing operation, the transfer paper The toner on the photosensitive drum 1 is not transferred to the area where the ear 31 is dirty with toner. Printing defects occur. For this reason, the width of the drum is narrower than that of the photosensitive drum 1 and the transfer charger 3. When using a new recording paper 2, make sure that there is no paper between the photosensitive drum 1 and the transfer charger 3. It is necessary to cover the non-paper portion B of the transfer charger 3.

0012 In order to solve this problem, Japanese Utility Model Application Publication No. 62-81967, Japanese Patent Application Publication No. 63-146084 and Publication No. 63-314580 insulates the non-paper portion of the transfer charger according to the width of the recording paper. A technique of covering with a transparent shielding film is disclosed.

[0013] Utility Model Application Publication No. 62-81967 and Japanese Patent Application Publication No. 63-146084 cover the transfer wire. To make the width of the shielding film variable, the shielding film is wound on a reel. This reel is provided with tension in the direction in which the shielding film is wound. Fix the leading edge of the shielding film to a paper feed tractor that can move in the width direction of the recording paper. By moving the paper feed tractor to set the recording paper, Accordingly, the width of the shielding film is automatically set.

[0014] In addition, Japanese Patent Application Laid-open No. 63-314580 describes how to print in a predetermined size such as A4 or B5. In a printing device that does not use a paper feed tractor and can handle printed recording paper, A technique for setting the shielding member of the transfer charger according to the width of the recording paper is described. Ru. This technology records data using a paper width detection sensor placed just before the transfer charger. The width of the paper is detected and the motor is driven according to the detected value to move the shielding member to a predetermined position. It should be set at the same position.

[0015]

[Problem that the idea aims to solve]

However, the structure disclosed in Utility Model Application Publication No. 62-81967 and Japanese Patent Application Publication No. 63-146084 According to the paper, the narrower the paper width, the greater the tension. for that , when you try to narrow it, you need a lot of force, but when you try to widen it, it moves lightly. This makes it extremely difficult to adjust the force, making fine adjustments extremely difficult, and making operability extremely difficult. It's getting worse. Also, if the tension is weakened to emphasize operability, the width will be increased. When using thick paper, the shielding film may loosen, damaging the photosensitive drum or causing damage to the transfer. Failures may occur, such as contacting and cutting the wire.

[0016] In addition, using a device compatible with cut paper as disclosed in Japanese Patent Application Laid-Open No. 63-314580, As a result, no force is applied to the paper feed tractor, improving operability. but, It is necessary to provide a separate power source to move the paper width detector and shielding member. It becomes extremely expensive, leads to the transfer charger becoming larger, and the overall size of the device increases. Connect.

[0017] Therefore, a plate-shaped shielding member as disclosed in Japanese Patent Application Laid-Open No. 63-314580 was used for the above-mentioned implementation. Paper feeding as proposed in 1982-81967 and 63-146084 Naturally, it is conceivable to link it to a tractor. By using a plate-shaped shielding member, This eliminates the need to apply tension, but when using the maximum width paper, this It became necessary to evacuate the plate-shaped shielding member, and as a matter of course, this plate-shaped shielding member A space is required for the transfer charger to retreat to the outside of the transfer charger.

[0018] By the way, normal printing devices are designed to be as compact as possible, and to It is designed to use as large a paper as possible. In other words, in the width direction of the transfer charger Since there is almost no room for this, it is important to provide space outside the transfer charger due to the large This will lead to a decline in functionality by either creating a pattern or narrowing the maximum paper width that can be used. .

[0019] The present invention provides a cover structure for a transfer charger that is low cost and has excellent operability. With the goal.

[0020]

[Means to solve the problem]

FIG. 1 is a diagram showing the configuration of the present invention. 1 uses the image to be printed as a toner image. It is an image carrier that is formed and held by 2 is a medium for printing out multiple pages. For recording, it consists of continuous recording paper and has guide parts at both ends for conveyance. It's paper. 3 is placed on the image carrier 1 with the recording paper 2 in between. This is a transfer charger that transfers the formed toner image onto the recording paper 2.

[0021] Reference numeral 4 denotes a paper feed tractor that fits into holes at both ends of the recording paper 2 and provides transport driving force. . 5 is a paper width adjustment mechanism that adjusts the width of the paper feed tractor 5 according to the width of the recording paper. Ru. 6 is when using narrow recording paper 2 on the surface of the transfer charger facing the image carrier. Second, it is a shielding film that shields the transfer charger 3 from the image carrier 1.

[0022] 71 and 72 are folds for folding the shielding film so that both ends move in the same direction. It is a return guide member. 8 indicates both ends of the shielding film between both folding guide members 71 and 72. It is a slider that is fixed and operates in conjunction with the paper width adjustment mechanism 5 of the paper feed tractor 4. Ru.

[0023]

[Effect]

Both ends of the shielding film are fixed to the same slider so that they are stretched in opposite directions. Therefore, as the slider moves, the shielding film is pulled at one end, but not at the other end. The sides are loosened by the same length and moved overall. This allows the The tension distance of the shielding film is always constant, and the tension of the shielding film is also always constant. becomes. By keeping the tension of the shielding film constant, the paper feed tractor No additional fluctuations due to the shielding film when operating the paper width adjustment mechanism are eliminated.

[0024]

【Example】 FIG. 2 is a diagram illustrating specific details according to an embodiment of the present invention, including a transfer charger, FIG. 2 is a side view showing the positional relationship and configuration of a shielding film and a paper feed tractor. Figure 3 is 1 is a perspective view showing a cover structure according to the present invention; FIG. Identical parts in both figures have the same symbols Expressed as The recording paper 2 is guided and conveyed to the transfer section by the conveyance section 4.

[0025] The conveyance section 4 is composed of a paper feed tractor and a conveyance guide. paper feeding tractor The tractor pin 41a slides around the tractor body 41 and moves. It is set up to do so. This tractor pin 41a is transmitted from the rotational drive shaft 42. It moves by the driving force. Then, open the tractor cover 43 and insert both sides of the recording paper 2. The hole provided at the end is fitted into the tractor pin 41a.

[0026] Then, by closing the tractor cover 43, the recording Hold down the recording paper 2 so that the holes in the paper 2 do not come out. In this way, the paper feed This enables the recording paper 2 to be positioned and transported by the actuator. Recording paper 2 is then transported. Guided by feeding guides 44 and 45, it can be transported between the transfer charger 3 and the photosensitive drum 1. The tractor is guided to the tractor cover 46 opposite to the tractor cover 43, and the tractor This enables positioning and conveyance of the recording paper 2 in the same way as on the cover 43 side.

[0027] Also, the recording paper 2 is transported to the transfer charger 3 by the same tractor pin. Since deposits and withdrawals are performed, they are performed in a synchronized state.

[0028] The tractor main body 41 is supported by a rotary drive shaft 42 and a support shaft 52, and the tractor position can be adjusted. Movement in the axial direction is regulated by a lever 51. If you change the width of recording paper 2, To do this, move the tractor body by lowering the tractor position adjustment lever 51. The section 41 is no longer restricted in the axial direction. Then, while lowering the tractor position adjustment lever 51, When the position adjustment handle 53 is given an axial movement, the tractor main body 41 moves, and the recording It can be adjusted to the width of paper 2.

[0029] The transfer charger 3 consists of a transfer wire 31 and a casing 32 that stretches and supports the transfer wire 31. It is set on the frame support member 33 and is removably provided. Mounting/detaching At times, the casing 32 slides on the rail portion 33b of the frame support member 33. When installed, it is set in the specified position by the guide 33c. . Then, when the casing 32 is pushed all the way, the transfer wire 31 is connected to the connector 34. At this time, a voltage can be applied to the transfer wire 31.

[0030] The slider 8 passes the slider block 81 through the slide shaft 82, and is connected to the interlocking members 83a and 83b. By sandwiching the tractor main body 41 from the axial direction, it is possible to interlock with the paper feeding tractor. It has become. Both ends of the cover 6, which is a shielding film, are attached to the slider block 81. A support member for fixing is fixed.

[0031] In order to support the tip of the cover part 6a that covers the transfer charger 3 of the cover 6, A slider arm 84 extending to the side of the photo charger 3 is fixed to the slider block 81. , a cover slider 85 that slides along the transfer charger 3 is provided at its tip, The tip of the cover portion 6a is supported by a cover slider 85. Also, cover 6 The tip of the other tension portion 6c provides tension to the cover 6 while supporting it. In order to support the slider not directly on the slider but through the spring 62, A spring support member 86 is fixed to the slider block 81.

[0032] The cover 6 is a first folding guide section that utilizes the cover slider 85 and the back surface of the connector 34. A cover portion 6a that is stretched between the material 71 and covers the transfer charger 3, and two folding guide portions. The space 33a provided below the rail portion 33b of the frame support member 33 between the members 71 and 72 is utilized. a folding part 6b for holding the surplus part of the cover part 6a stretched over the The tension of the cover 6 is always kept constant between the internal member 72 and the spring support member 86. It is composed of a tension section 6c for holding.

[0033] A predetermined tension is applied to the tip of the cover 6 on the tension portion 6c side. A cover support member 61 is fixed to be coupled with a spring 62 to provide the A spring 62 is coupled to the cover support member 61 and supported by a spring support member 86. In addition, the spring 62 is not necessarily required at the position shown in the figure, it may be provided at the folded part 6b, or depending on the parts precision. You don't need to use it if you feel like it.

[0034] Next, the operation of the cover structure configured as described above will be explained. Set one end of the recording paper 2 on the other positioned paper feed tractor, and Position the paper feed tractor so that the hole in the recording paper 2 on the other side fits into the tractor pin 41a. Adjust. At this time, lower the tractor position adjustment lever 51 and adjust the paper feed tractor. By moving the paper and aligning it with the width of recording paper 2, the holes in recording paper 2 will align with the tractor taper. It becomes possible to fit into the pin 41a.

[0035] Then, when the paper feed tractor is moved to match the narrow paper width, the interlocking section The paper 83a is now pushed, and the slider moves in accordance with the movement of the paper feed tractor. . When the cover part 6a of the cover 6 is pulled due to the movement of the slider 8, it is the same. At times, the tension portion 6c is loosened. Since these two operations are performed at the same time, The part 6b pulls the surplus of the tension part 6c and sends it to the cover part 6a. . Since both ends of the cover 6 are fixed to the same slider 8, the movement caused by this movement is The amount and direction of movement are the same and in the same direction, and the length of the spring 62 does not change. Therefore, The tension applied to the cover 6 is constant.

[0036] Next, when replacing narrow-width recording paper with wide-width recording paper, use the paper feed As the actuator moves, the interlocking member 83b is pushed and the slider 8 moves. Depending on the action Contrary to what was mentioned above, the cover part 6a can now be loosened and the tension part 6c can be loosened. You'll start to feel drawn to it. As a result, the folded portion 6b absorbs the excess portion of the cover portion 6a. It starts to be pulled and sent to the tension section 6c. In this case, as mentioned above, The length of the spring does not change and the tension remains constant.

[0037]

[Effect of the idea]

As explained above, according to the present invention, the cover is made into an annular shape so that the paper feed tractor and the By connecting through the wire, the shielding part changes in conjunction with the paper feed tractor, so the paper No adjustment is required when changing the width, and a constant tension is always applied to the cover regardless of the shielding length. Moreover, the moment acting on the joint of the paper feed tractor can be reduced, and the related electronic photographs can be This greatly contributes to improving the performance of the device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention.

FIG. 2 is a side view illustrating an embodiment of the present invention.

FIG. 3 is a perspective view showing a cover structure according to the present invention.

FIG. 4 is a diagram showing the general configuration of an electrophotographic printing device.

FIG. 5 is a diagram showing a conventional transfer charger.

[Explanation of symbols]

3 Transfer charger 4 Paper feed tractor 5 Paper width adjustment mechanism 6 Shielding film 71,72 Folding guide member 8 Slider

Claims (1)

[Scope of utility model registration request] Claim 1: A transfer charger (3) which is arranged to sandwich a recording paper (2) from the image carrier (1) and transfers the toner image formed on the image carrier (1) to the recording paper (2). ), a paper feed tractor (4) that transports the recording paper (2), and a paper width adjustment mechanism (5) that adjusts the width of the paper feed tractor (4) according to the width of the recording paper (2).
A cover structure for a transfer charger (3) comprising a shielding film (6) that shields a surface of the transfer charger (3) facing the image carrier (1) according to the width of the recording paper (2), Said transfer charger (3)
a first folding back the shielding film close to one end of the
A folding guide member (71) is provided, and a second folding guide member (72) is provided on the other side of the transfer charger, and the shielding film (6) is stretched between these folding guide members. Both ends of the shielding film are fixed between the folding guide members (71, 72) to a slider (8) that is interlocked with the paper width adjustment mechanism (5) of the paper feed tractor (4). Cover structure of transfer charger.