JPH055757U - Image forming device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is designed to prevent the vibration of a stopper provided in a recording paper conveyance section of an image forming apparatus for controlling the timing of recording paper conveyance. [Structure] A stopper 48 for restricting conveyance of the recording paper P is provided in the image forming apparatus, vibration is prevented by using a vibration suppressing material only in the stopper 48 portion, and a general material is used for a mounting member of the stopper 48. Made the manufacturing easier.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention, in a recording apparatus, a color image forming apparatus, etc., when a recording sheet is fed from an image-feeding device to an image carrier for image formation, the transfer position of the image formed on the image carrier and the recording sheet is determined. The present invention relates to the improvement of the stopping means for achieving accurate coincidence.

[0002]

[Prior Art]

 Conventionally, after recording paper is fed by a paper feeding device, recording is performed between the paper feeding device and the image bearing member so that a visible image formed on, for example, a drum-shaped image bearing member can be accurately transferred onto the recording paper. A stop member for temporarily stopping the paper is provided. As the stop member, a pair of re-feedable rollers or a stopper means that appears and retracts at the sheet feeding position is used. In the case of a roller pair, there is no particular operating noise when it is rotating, but in the case of the stopper means, the long stopper member provided at the length of the recording paper width suddenly moves in and out, causing vibration. , Generate a vibration sound. Therefore, when the recording paper releases the stopper means and is re-fed, a vibrating noise is generated, which causes noise and makes the user uncomfortable. Therefore, for example, a commercially available vibration suppressing material (product name: Mitsui SDP, manufactured by Mitsui Petrochemical Industry Co., Ltd.) is available. The vibration suppressing material is generally manufactured as a vibration damping steel plate, and is constructed by stacking two steel plates centering on a vibration absorbing special resin. Therefore, it is possible to prevent vibration by using the vibration suppressing material, but if the vibration suppressing material is used as a whole, there is a drawback that abrasion occurs in the material during processing and accurate processing cannot be performed.

[0003]

[Problems to be solved by the device]

 This is a device specifically designed to eliminate the above-mentioned drawbacks of the present invention. That is, a stopper member provided between the image carrier of the recording apparatus or the image forming apparatus and the sheet feeding device is manufactured by using the vibration suppressing member to perform the vibration damping function, and the stopper member of the vibration suppressing member with respect to the apparatus main body. This is to solve the above-mentioned drawback, which is a problem in manufacturing, by mounting only the mounting portion using a normal metal or resin material.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides an image forming apparatus including an image carrier for image formation and a paper feeding device for feeding a recording paper on which an image formed on the image carrier is transferred. And a stopping means for temporarily stopping the recording paper between the paper feeding device and the image carrier, and the stopping means forms a plurality of recording paper stopping projections and is a movable member made of a vibration suppressing material. And a separate supporting member that supports both ends of the movable member.

[0005]

【Example】

 FIG. 1 shows the configuration of an embodiment of the image forming apparatus of the present invention. Hereinafter, description will be given with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a lower frame of the image forming apparatus, and a half-moon-shaped paper feed roller 2 for feeding the recording paper P is provided in the lower frame 1 and a plurality of the recording papers P are incorporated. The sheet feeding cassette 3 is detachably provided on the lower frame 1. A push-up plate 4 that is pushed up by a spring 5 is provided in the paper feed cassette 3, and the recording paper P is placed on the paper feed cassette 3 and a separation claw 6 rotatably provided on a part of the paper feed cassette 3 is provided. The top of the recording paper P is locked at the top. Reference numeral 7 is a guide plate for guiding both sides of the recording paper P and is provided so as to be adjustable according to the size of the recording paper. The above configuration is provided in the paper feed cassette 3. Reference numeral 8 is a conveyance roller for the recording paper P provided on the lower frame 1, and is provided between a guide plate 9 for guiding the leading end of the recording paper P fed by the paper feed roller 2 and a reverse guide plate 10. There is.

Reference numeral 11 denotes a guide plate for guiding the recording paper P to the registration roller 12 after the recording paper P is reversed and fed, and guides the recording paper P to the registration roller 12. Reference numeral 13 is a rocking member for turning on and off a sensor S ₁ for detecting the recording paper P at the position of the registration roller 12. Reference numeral 14 is a guide plate that guides the recording paper P, which has passed through the registration roller 12, toward the transfer belt 15, and the transfer belt 15 is suspended by a transfer roller 16, a roller 17 and a drive roller 18. 15a is a cleaning means for cleaning the surface of the transfer belt 15. Reference numeral 19 denotes a fixing device for fixing the image transferred on the recording paper P, which is composed of a fixing heating roller 20 and a pressure-bonding roller 21, and a cleaning roller 20a is brought into pressure contact with the fixing heating roller 20 so as to rotate. To clean. A reference numeral 22 denotes a paper ejection roller for ejecting the recording paper P from the fixing device 19, and an oscillating member 23 for turning on and off the sensor S ₂ for confirming the ejection of the recording paper P is operated by the recording paper at the time of paper ejection. The discharged recording paper P is a recording paper guide member 24, a guide passage 25 formed in the upper frame 1c, and a discharge tray 28 provided above the upper frame 1c by the guide transport rollers 26 and 27. The recording paper P is configured to be ejected. Next, a photosensitive drum 29 for image formation is provided in the substantially central portion of the upper frame 1c, and four developing devices 30, 31, 32, 33 are provided along the surface of the photosensitive drum 29 from the top. The developing device frame 30a is arranged so that the developing device frame 30a is independent of four sets of developing devices 30, 31, 32, 33 as shown in FIG. A gear (not shown) to be operated is provided. A polygon mirror 34 reflects the laser light emitted from the laser light source 35 by reflecting mirrors 36, 37 and 38 to expose the photosensitive drum 29. Reference numeral 39 denotes an optical system frame body in which optical systems such as the polygon mirror 34 and the reflection mirrors 36, 37 and 38 are integrally incorporated, and is incorporated in the uppermost part of the upper frame body 1c.

Reference numeral 40 denotes a charging electrode for charging the entire surface of the photosensitive drum 29, which is provided on a part of the upper frame 1c. 41 is a cleaning blade for cleaning the residual developer adhering to the surface of the photosensitive drum 29 after transferring the image from the photosensitive drum 29 to the recording paper P, and for discharging the cleaned developer to the outside. The transport device 43 is provided, and the developer receiving member 42 that efficiently sends the developer scraped by the cleaning blade to the transport device 43 is provided below the cleaning blade 41. The developer transferred to the outside by the transfer device 43 is transferred to the container 44 by the conveyor 45 so that an appropriate amount can be stored in the container 44, and the developer can be removed and discarded. Reference numeral 46 is a developer container for supplying the developer to each of the developing devices 30, 31, 32, and 33, but only four sets of developer containers are shown, but four sets are provided side by side. For example, cyan, magenta, yellow, and black color developers are supplied to 30, 31, 32, and 33 to perform color development. Reference numeral 47 is a manual tray that allows the recording paper P to be manually fed. The lower frame 1 and the upper frame 1c are assembled around the support shaft 1b so that the conveyance path of the recording paper P can be opened. When P does not reach the fixing device 19 at least, the upper frame 1c can be opened with the support shaft 1b centered and the recording paper P can be taken out. Further, there is provided a guide plate 1a that allows the recording paper P provided on the lower frame 1 to be supplied from another paper feeding device (not shown).

A stopper 48 is provided at a portion of the guide plate 14 provided on the lower frame 1, and is a stopper for temporarily stopping the recording paper P. The stopper is formed in a plate shape using a vibration suppressing material. .. As shown in FIG. 2, the stopper 48 is provided with two protrusions 49A and 49B arranged side by side around the protrusion 49 for stopping the recording paper P. Further, projections 49C and 49D are provided on the outer sides of the projections 49A and 49B to ensure the contact of the leading edge of the recording paper P. Further, the left and right sides of the stopper 48 are integrally formed with mounting portions 48A and 48B extending in a direction perpendicular to the longitudinal direction. Then, separate mounting members 50 and 52 made of ordinary metal or resin are fixed to the mounting portions 48A and 48B by screws or welding as shown in FIG. Reference numerals 51 and 53 are locking projections formed on the mounting member. The locking projections of the mounting members 50 and 52 are engaged with the support shafts 54 and 55 provided on the side of the guide plate 14 of the lower frame 1. Then, a stopper 48 is provided on a part of the guide plate 14. The stopper 48 is provided at a lower position with respect to the guide plate 14 as shown in FIG. 1, and only the protrusions 49, 49A, 49B, 49C and 49D project into the passage of the recording paper P of the guide plate 14. To set up.

The present invention is configured as described above, and the recording paper P is now fed by the paper feed roller 2, and the recording roller P is once transferred to the registration roller 12 via the reverse guide plate 10 by the transport roller 8. Feed and stop. Next, the recording paper P starts to be fed by the rotation of the registration roller 12, but is further blocked by the projections 49, 49A, 49B, 49C and 49D of the stopper 48. Then, the stopper 48 is rotated downward about the support shafts 54 and 55 at the timing at which the image on the photosensitive drum 29 is completely matched. Incidentally, as the operating means for rotating, a well-known electromagnetic solenoid or a cam or the like is used to operate by using the CPU incorporated in the image forming apparatus, and the conveyance is started in conformity with the image on the photosensitive drum 29. The image is transferred onto the recording paper P. In particular, the present proposal is used because it is an image forming apparatus for transferring a color image. Since it is necessary to transfer the color toner image to the registration roller more clearly, the provision of the stopper 48 made it possible to transfer the color image accurately.

[0011]

[Effect of the device]

 As described above, according to the present invention, the stopper 48 for stopping the recording paper provided in the recording apparatus and the color image forming apparatus is manufactured by the vibration suppressing material, and the sound is prevented from being generated when the stopper 48 is operated. The stopper 48 and the projections for blocking the paper P are made of the vibration suppressing material to prevent vibration, and the vibration suppressing material that is difficult to process is not the minimum necessary member. Since the members are made of general materials, there is an excellent effect that the stopper 48 can be easily manufactured and processed.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of an image forming apparatus in which a stopper according to the present invention is implemented.

FIG. 2 is an exploded perspective view showing the entire stopper of the present invention.

FIG. 3 is an overall perspective view of the stopper of the present invention attached to an image forming apparatus.

[Explanation of symbols] 1 lower frame 1c upper frame 2 paper feed roller 3 paper feed cassette 7,9,10,11,14 guide plate 12 registration roller 15 transfer belt 20 fixing heating roller 20a cleaning roller 28 paper ejection tray 29 photoconductor drum 30,31,32,33 developing device 30a developing device frame 34 polygon mirror 48 stopper 50,52 mounting member

Claims (1)

Claims for utility model registration 1. An image forming apparatus comprising an image carrier for image formation, and a paper feeding device for feeding a recording paper on which an image formed on the image carrier is transferred. A stop means for temporarily stopping the recording paper between the paper feeding device and the image carrier, the stopping means forming a plurality of recording paper stop projections, and a movable member made of a vibration suppressing material. An image forming apparatus comprising: a separate supporting member that supports both ends of the movable member.