JPH0510367U - Paper discharge device of image forming apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] Regardless of the type of image forming paper,
(EN) Provided is a sheet discharging device of an image forming apparatus, which can always stack image forming sheets on a sheet discharging tray in a sure manner and does not cause a sheet discharging jam. [Structure] The guide plates 1 are provided on the paper ejection side fences 12, 12.
3 and 13 are provided so as to face each other. Information board 13
The guide portion 13b of the
The guide portion 13b can be moved to a position where the guide portion 13b retracts from the delivery tray 10. Both ends of the printing paper are supported by the guide portion 13b between the left and right paper ejection side guides 12, 12. Next, the guide portion 13b is rotated so as to retract from the paper discharge tray 10. When the guide portion 13b retracts from the paper discharge tray 10, the print paper naturally drops and is placed on the paper discharge tray 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a paper discharge device of an image forming apparatus such as a copying machine or a printing machine.

[0002]

[Prior art]

  There are various types of paper ejection devices such as copiers and printers. , The so-called chain delivery type paper discharge device is the mainstream. Chain deliveries The Lee-type paper ejection device clamps the leading edge of the image forming paper with a clamping device. , This clamp device is guided and conveyed by a chain, and the image forming paper is placed on the paper output table. It should be loaded in an orderly manner.   However, chain delivery devices are very large and expensive. , It is not suitable for mounting on small office printers and copiers.

[0003]   Therefore, in a small-sized printing machine or the like, the image forming paper may You have to use a paper ejecting device that flies (ejects) toward the paper table. It However, if you simply fly the image forming paper toward the paper ejection tray, Since the sheets are not neatly stacked on the output tray, the output side Provide a guide and a paper discharge end fence at the end of the paper discharge tray in the paper discharge direction. U-shaped image forming paper is attached to the area surrounded by the id guide and paper ejection end fence. Discharging is performed in the state of being dislodged.

[0004]   As a device that surely and accurately bends the image forming sheet, a full-fledged Kaikai 56- A method of blowing air toward an image forming sheet disclosed in Japanese Patent No. 66460 No., a raised member that requires a waist attachment, as disclosed in Japanese Utility Model Laid-Open No. 165347/1985. Which is detachably provided, and a wire disclosed in JP-A-56-61266 There is a device provided with a sheet discharge guide member.

[0005]   When the speed of the image forming paper is low when ejecting the image forming paper toward the paper output tray, There is a risk of paper ejection jams. To prevent this, the paper ejection speed is increased As a device of the above, a guide of high peripheral speed disclosed in Japanese Utility Model Laid-Open No. 58-160152 A belt provided with a roller, which is disclosed in JP-A-60-148864 Some are equipped with a transport suction unit.

[0006]   Furthermore, since the image forming paper is aligned on the paper ejection tray, it is called the paper ejection jogger system Align the right paper ejection side guides with the ejection of image forming paper, and There is also known a system of reciprocating in the direction of changing the span between the terminals.   In addition, as disclosed in Japanese Utility Model Laid-Open No. 2-91747, a paper discharge side guide Attempts have been made to provide a guide member on a part of the inside of the.

[0007]

[Problems to be solved by the device]

  However, in the above-described conventional paper ejection device, the image forming paper is correctly placed on the paper ejection tray. In addition, it is difficult to stack them in a reliable arrangement, and the prevention of paper discharge jams is insufficient. Is. There are so many types of image forming paper that the output speed changes. For example, in the case of thin image forming paper and thick image forming paper, This is because the form of the image forming sheet at that time is different.

[0008]   Further, the paper discharge form also differs depending on the size of the image forming paper. High speed marking The form of the image forming paper at the time of paper discharge differs depending on whether it is printing or low speed printing.   In a high humidity environment, especially thin image forming paper loses its stiffness. , Even if the paper is ejected by the paper ejection device, it may not reach the paper ejection tray.

[0009]   The present invention has been made by paying attention to the above-mentioned conventional problems. Make sure that the image forming paper is always aligned on the paper output tray regardless of the type etc. (EN) Provided is a sheet discharge device of an image forming apparatus that can be stacked and that does not cause a sheet discharge jam. aimed to.

[0010]   The forms of the paper discharge jam are shown in FIGS. 8 to 11. In the figure, reference numeral 96 is a base. The belt is hung on the roller 97 and driven by the rotation of the roller 97. Move. Reference numeral 90 denotes a paper discharge tray on which the image forming paper 100 is stacked. An end fence 91 is provided at the end of the paper tray 90.

[0011]   FIG. 8 shows that the leading end of the image forming paper 100 is bent downward and the paper is discharged. The case where it becomes a jam is shown.   FIG. 9 shows that the leading end of the image forming paper 100 hangs down and the image on the paper discharge tray 90 is displayed. The case where the sheet comes into contact with the image forming sheet and becomes a brake to cause a sheet discharge jam is shown. This This occurs especially when using thick image forming paper and discharging at low speed. Sui.

[0012]   FIG. 10 shows that the image forming paper 100 that has been previously sent is sent to the rear end of the image forming paper 100 afterward. The case where the leading end of the image forming sheet 100 comes into contact with each other to form a sheet discharge jam is shown. This This occurs when the image forming paper 100 is sent out from the image forming apparatus at high speed. Sui.   FIG. 11 shows that the leading edge of the image forming paper 100 hits the end fence 91. The case where the image forming paper 100 is curved and becomes a paper discharge jam is shown. This is a thin picture Image forming paper is used, and the image forming paper 100 is fed at high speed from the image forming apparatus. When it is done, it easily occurs.

[0013]

[Means for Solving the Problems]

  According to a first aspect of the present invention, an image forming sheet discharged from the image forming apparatus is stacked and discharged. A paper table, a pair of side plates provided on the paper discharging table and facing each other at a distance, A posture and a tip which are provided on the pair of side plates so as to face each other and project on the discharge tray. A guide part that can be operated in a posture in which it rotates in the direction toward the paper ejection tray side and retracts from the paper ejection tray. Material and a guide for rotating the guide member in accordance with the discharge timing of the image forming apparatus A sheet discharging device of an image forming apparatus having a member rotating unit.

[0014]   According to a second aspect of the present invention, in the first aspect, the pair of side plates are separated from each other in a direction toward and away from each other. It is a paper discharge device of an image forming apparatus that is movable in the direction of the arrow.

[0015]   According to a third aspect of the present invention, in the first aspect, the guide member is inclined toward the paper ejection tray. Image that can be rotated between a position in which it projects above the paper ejection tray and a position in which it recedes from the paper ejection tray in this state. It is a paper discharge device of the image forming apparatus.

[0016]

[Action]

  In the present invention, the image forming paper discharged from the image forming apparatus is projected on the paper discharge tray. It is placed on the guide member that is in the closed state and is curved to the side of the paper ejection table. At the same time, the guide member rotates to the side of the paper ejection tray and is in a posture of retracting from the paper ejection tray. And image shape The formed paper drops and is placed on the paper output tray.   Further, according to the invention of claim 2, a pair of side plates is provided according to the size of the image forming sheet. You can adjust the distance between.   According to the invention of claim 3, when the image forming sheet is placed on the guide member, the image forming is performed. The paper is smoothly curved toward the paper ejection tray.

[0017]

【Example】

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.   In FIG. 1, reference numeral 50 indicates a stencil printing machine as an image forming apparatus. In the figure Reference numeral 1 indicates a printing drum, and a press roller 3 is arranged facing the printing drum 1. It is placed. The press roller 3 is pressed against the printing roller 1 via the printing paper 2. It Reference numeral 4 indicates a peeling claw.

[0018]   Reference numeral 5 indicates a discharged sheet suction and conveyance device. The conveyor belt 6 is hung on the rollers 7, It is driven by the rotation operation of the rollers 7, 7. Jump to the tip side of the conveyor belt 6 A stand 9 is provided. Reference numeral 8 indicates an air suction unit.

[0019]   Reference numeral 60 indicates a paper discharge device. At the front end side of the discharge tray 10 as a discharge tray Is provided with a paper discharge end fence 11. A pair on both sides of the paper ejection tray 10. The paper discharge side fences 12 and 12 are arranged as side plates. This paper size The fences 12 and 12 can be moved toward and away from each other, and It can be fixed with a filter, and the span S changes depending on the size of the printing paper 2. it can.

[0020]   Guide plates 13, 13 are provided on the paper ejection side fences 12, 12 so as to face each other. Has been. The guide plates 13 and 13 are formed in a shape extending along the paper discharge direction of the printing paper 2. Is made. The end portions 13a, 13a of the guide plates 13, 13 on the printing machine 50 side are downward The printing paper 2 ejected from the printing machine 50 has a shape that is slightly bent toward Is designed so that it does not get caught.   FIG. 3 shows a detailed structure of the guide plate 13. The guide plates 13, 13 have a symmetrical structure Therefore, the structure of the left guide plate 13 will be described with reference to FIG. The description of the structure is omitted.

[0021]   As shown in FIG. 3, a mounting hole 12a is formed in the paper discharge side fence 12. It The guide plate 13 is rotatable around the shaft 20 on the inner surface 12b of the mounting hole 12a. It is installed. As shown in FIG. 3, the guide plate 13 has a guide portion 13b with a discharge tray. 10 and the guide portion 13b can be moved to a position where the guide part 13b retracts from the top of the paper ejection tray 10. It With the guide portion 13b of the guide plate 13 protruding most, the upper surface of the guide portion 13b The angle θ formed by the upright surface of the paper side fence 12 is more than 90 °. It is set to be large. This angle θ is in the range of approximately 100 ° to 140 ° Is desirable.

[0022]   The length l by which the guide portion 13b of the guide plate 13 protrudes above the paper discharge tray 10 is the printing paper. 2 is enough to guide both ends of the paper 2 and the printing paper 2 falls on the paper ejection tray 10. It should be a size that does not interfere with the lowering, which is approximately 5 mm to 20 mm. It is desirable to set to mm.

[0023]   As shown in FIG. 3, on the outside of the guide plate 13 (on the side opposite to the guide portion 13b), the sector The gear 21 is formed. Reference numeral 22 indicates a rack, and this rack 22 is a guide It is supported by 23 and 24 so as to be vertically movable. The rack 22 is a section of the guide plate 13. It meshes with the gear 21. At the bottom of the rack 22 is a solenoid 25 It is connected.

[0024] This solenoid 25 is connected to the control device of the printing machine 50 and has a predetermined type for paper discharge operation. It is designed to be driven with imming. One end of the rack 22 is a guide The other end of the spring 26 attached to 23 is connected. The rack 22 is biased upward by the elastic force of 26, and the guide plate 13 is guided by the guide portion 13b. Is urged in the direction of retracting from the top of the paper discharge tray 10. Solenoid 25 is normal It is charged and is in a suction state. Therefore, the rack 22 has an elastic force of the spring 26. The guide portion 13b is in the normal state, on the discharge tray 10 It is in a protruding state.

[0025]   Sector gear 21, rack 22, guides 23, 24, solenoid 25, spring Guide member rotating means is constituted by the control unit of the press 26 and the printing machine 50. . Next, the printing machine 50 and the paper discharge device 60 that interlocks with the paper discharge operation of the printing machine 50. The operation will be described.

[0026]   The printing paper 2 sent from a paper feeding device (not shown) rotates in the clockwise direction. The image is formed on the printing paper 2 by being pressed against the ram 1 by the press roller 3. Is made. The printing paper 2 on which the image is formed is removed from the printing drum 1 by the peeling claw 4. This printing paper 2 is peeled off. The air adsorption unit 8 is mounted on the driven conveyor belt 6. It is adsorbed by and conveyed. The speed of the conveyor belt 6 is the same as that of the printing drum 1. It is set to be slightly higher than the peripheral speed. The printing paper 2 has a jump base 9 As it passes, it is slightly stiffened and discharged toward the paper discharge device 60.

[0027]   As shown in FIG. 4, the printing paper 2 ejected from the paper ejection suction conveyance device 5 is ejected to the left and right. Both end portions are supported by the guide portion 13b between the paper side guides 12, 12. Then Seo The energization of the renoid 25 is turned off by the control of the control device, and the rack 22 sprinkles. The upper end of the printing paper 2 rises due to the elastic force of the paper guide 22 and the paper ejection end fence 11 Before hitting, the guide portion 13b rotates so as to retract from the top of the discharge tray 10. Information department When 13b retracts from the discharge tray 10, the printing paper 2 falls naturally as shown in FIG. Then, the sheet is placed on the discharge tray 10. Further, the solenoid 25 is energized, and the guide plate The guide portion 13b returns to a state in which the guide portion 13b projects above the paper discharge tray 10, and is then discharged. Prepare for incoming printing paper 2. The operation of the paper discharge device 60 is the paper discharge from the printing machine 50. It is done in time.

[0028]   Next, a second embodiment will be described.   In the paper discharge device according to the second embodiment, only the guide plate and the structure for driving the guide plate are the first actual ones. Since it is different from the paper discharge device of the embodiment, only the differences will be explained and the same structural member will be used. The same reference numerals as those in the first embodiment are given and the description thereof will be omitted.

[0029]   In FIG. 7, reference numeral 62 indicates a paper discharge side fence. A mounting hole 62a is formed in 62. Guides are provided on the inner surface of the mounting hole 62a. A plate 63 is attached so as to be rotatable around the shaft 20.   The guide plate 63 has three guide portions 63a formed in a radial pattern. 3a are arranged at equal intervals. The gear 27 is provided at the center of the guide plate 63. There is.

[0030]   Reference numeral 29 indicates a pulse motor, and the guide plate 6 is attached to the rotation shaft of the pulse motor 29. A gear 28 larger than the third gear 27 is attached. This gear 28 is gear 2 It meshes with 7.   The pulse motor 29, the gear 28, the gear 27 and the control device of the printing machine 50 Therefore, the guide member rotating means is configured.   The guide plate 63 according to the second embodiment includes a pulse motor 29, a gear 28, and a gear 27. The power is transmitted via the motor to rotate, and the same motion as the motion described in FIGS. 4 to 6 is performed. The work is done. In this operation, the pallet is controlled by the control device of the printing press 50. The motor 29 is rotated by a fixed pulse in synchronization with the discharge timing of the printing machine 50. Move. The rotation amount of the gear 27 corresponding to this constant pulse is 120 °.

[0031]   Instead of the pulse motor 29, a DC micromotor and a rotation angle detection sensor are used. Can also be used in combination.   In the above embodiment, the printing machine is shown as the image forming apparatus, but the present invention is applicable to the copying machine. Can be applied.

[0032]

[Effect of device]

  As described above, according to the present invention, regardless of the type of image forming paper, This makes it possible to reliably stack the image forming sheets on the discharge tray in a consistent state. Also There is no risk of paper ejection jams.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a printing apparatus and a sheet discharging apparatus according to a first embodiment of the present invention.

FIG. 2 is a front view of the paper discharge device according to the first embodiment of the present invention.

FIG. 3 is a view showing a structure for driving a guide plate of the paper discharge device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing one process until the printing paper discharged from the printing device is placed on a paper discharge tray.

FIG. 5 is a diagram showing one process until the printing paper discharged from the printing device is placed on a paper discharge tray.

FIG. 6 is a diagram showing one process until the printing paper discharged from the printing apparatus is placed on the paper discharge tray.

FIG. 7 is a view showing a structure for driving a guide plate of a paper discharge device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing an aspect of a paper discharge jam.

FIG. 9 is a diagram showing an aspect of a paper discharge jam.

FIG. 10 is a diagram showing an aspect of a paper discharge jam.

FIG. 11 is a diagram illustrating an aspect of a paper discharge jam.

[Explanation of symbols]

2 printing paper 10 Output tray 11 Paper discharge end fence 12 Paper ejection side fence 13 Information board 13a guidance section 21 sector gear 22 racks 23 Guide 24 guides 25 solenoid 26 spring 29 pulse motor 28 gears 27 gears

Claims (3)

[Scope of utility model registration request] 1. A paper discharge tray on which image forming paper discharged from an image forming apparatus is stacked, a pair of side plates provided on the paper discharge tray and facing each other, and a pair of side plates. A guide member which is provided so as to be opposed to each other and can be operated in a posture in which it projects above the paper ejection tray and a posture in which the tip turns in the direction toward the paper ejection tray side and recedes from the paper ejection tray; A sheet discharging device for an image forming apparatus, comprising: a guide member rotating means for rotating the image forming apparatus at a sheet discharging timing. 2. A paper discharge device of an image forming apparatus according to claim 1, wherein the pair of side plates are movable in a direction toward each other and a direction away from each other. 3. The image forming apparatus according to claim 1, wherein the guide member is capable of rotating between a posture in which the guide member is inclined toward the discharge tray and a posture in which the guide member protrudes onto the discharge tray and a posture in which the guide member recedes from the discharge tray. Paper ejection device.