JP3644894B2 - Jam handling mechanism of sheet conveying device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming apparatus having functions of a copying machine, a printer, a facsimile, and the like, which conveys a sheet-like recording medium such as paper and OHP paper, and a single peripheral such as a sheet post-processing device and a multi-stage paper feeding desk The present invention relates to a sheet conveying device used in the apparatus, and more particularly to a jam handling mechanism in the sheet conveying device.
[0002]
[Prior art]
In the sheet conveying apparatus, a jam (paper jam) may occur at the time of sheet conveyance, and a countermeasure against jamming (paper jam removal) has been conventionally taken. Such countermeasures against jamming are disclosed in, for example, Japanese Patent Laid-Open Nos. 5-32348 and 5-249863.
[0003]
Japanese Patent Laid-Open No. 5-32348 discloses a registration roller that is disposed upstream of an image forming unit and is driven independently, and a relay roller that is disposed between the registration roller and a sheet feeding unit and is independently driven. A knob disposed at an end of the registration roller, a first one-way clutch that transmits rotation of the knob in the paper feeding direction to the registration roller, and rotation of the registration roller in the paper feeding direction. A second one-way clutch that transmits to the roller is provided, and if a jam occurs, the knob is rotated in the paper feeding direction so that the torque of the knob is transmitted to the registration roller by the first one-way clutch. A configuration in which the rotational force of the registration roller is transmitted to the relay roller by a second one-way clutch is disclosed. With such a configuration, the relay roller located on the upstream side can be rotated in the paper feeding direction by rotating only one registration roller, so that no matter where the paper being fed jams, The paper can be taken out without applying tension to the paper. Further, when the knob is rotated in the direction opposite to the feeding direction, the second one-way clutch does not transmit the rotation of the knob to the registration rollers. Therefore, it is possible to prevent the paper from being returned in the direction opposite to the paper feeding direction.
[0004]
Japanese Patent Application Laid-Open No. 5-249863 discloses a locking mechanism in which the operator inadvertently reverses the heat roller gear when removing a paper jam generated in the fixing heat roller in the fixing mechanism. Even if the knob is rotated while the connection gear to be rotated is connected, the knob only rotates idle, the connection gear does not rotate, and the knob is pulled to engage the inner / outer dual structure knob internally. Only when they are combined, the connecting gear is separated from the driving gear and is rotatable. With such a configuration, it becomes possible to prevent damage such as destruction of the boss portion of the connecting gear or the gear itself due to an erroneous operation of the knob portion, and at the same time, the paper removing operation at the time of paper jam is made efficient.
[0005]
[Problems to be solved by the invention]
However, as in the jam handling technique disclosed in Japanese Patent Laid-Open No. 5-32348, when a mechanism that makes reverse rotation impossible by a one-way clutch and allows rotation only in a predetermined direction is provided inside the knob. It is necessary to press-fit a one-way clutch, and the inner diameter dimensional accuracy of the mounting portion is required. As a result, the cost of the knob portion itself is increased, and the cost of the one-way clutch is also required.
[0006]
Further, if the knob portion has an inner and outer double structure as in the jam processing technique disclosed in Japanese Patent Laid-Open No. 5-249863, it is necessary to slide and engage the knob portion when performing an operation. Therefore, a space for sliding in the machine is required, and because of the double structure inside and outside, the number of parts is large and the assembly process is also increased.
[0007]
The present invention has been made to solve the above-mentioned problems, and does not use a one-way clutch, reduces costs, and enables an operator to perform appropriate jam processing with a compact and simple structure. An object of the present invention is to provide a jam handling mechanism of a sheet conveying apparatus.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
According to a first aspect of the present invention, there is provided a jam handling mechanism of a sheet conveying apparatus including a driving roller and a driven roller for nipping and conveying a sheet, and a knob fixed to one end of the driving roller. A plurality of protrusions are provided on the outer periphery, and the protrusions are substantially perpendicular to the normal rotation direction of the knob, and when the operation part is in a position substantially perpendicular to the pressing direction, And a non-operation portion that forms an obtuse slope toward the tip of the protrusion with respect to the reverse non-pressing direction.
[0009]
According to the first aspect of the present invention, when the knob is pressed and rotated, the rotational force is easily transmitted to the operation portion of the protrusion, and the rotational force is difficult to transmit to the non-operation portion of the protrusion. It becomes easy to rotate the knob only in one direction.
[0010]
According to a second aspect of the present invention, there is provided the sheet conveying apparatus according to the first aspect, wherein the non-operation portion includes a convex rib parallel to a rotation direction of the knob.
[0011]
According to the second aspect of the present invention, the ribs are easily slipped and the rotational force is hardly transmitted to the non-operation part.
[0012]
A third aspect of the present invention is the sheet conveying apparatus according to the first aspect, wherein the non-operation unit includes a rotating member that is rotatable in any direction by a pressing force.
[0013]
According to the 3rd summary of this invention, it becomes easy to slip with a rotor, and also it becomes difficult to transmit a rotational force to a non-operation part.
[0014]
According to a fourth aspect of the present invention, in the non-operation portion, the non-operation portion includes a reversible slide member that receives a pressing force in a non-pressing direction and moves in the protrusion tip portion direction. It is in the jam handling mechanism of the sheet conveying apparatus.
[0015]
According to the fourth aspect of the present invention, when a pressing force is applied to the slide member, the slide member moves along the other surface, so that it is difficult to transmit the rotational force to the non-operation part. When the rotation operation is stopped, the slide member returns.
[0016]
According to a fifth aspect of the present invention, there is provided a jam handling mechanism of a sheet conveying apparatus including a driving roller and a driven roller for nipping and conveying a sheet, and a knob fixed to one end of the driving roller. A plurality of protrusions are provided on the outer periphery, and the protrusions are provided so as to be tiltable in a direction opposite to the rotation direction from an upright state at a predetermined angle with respect to the outer peripheral surface in the rotation direction of the knob. It is in the jam handling mechanism of the sheet conveying apparatus.
[0017]
According to the fifth aspect of the present invention, when the knob is pressed and rotated, the rotational force is easily transmitted when the protrusion is standing upright, and the rotational force is difficult to transmit when the protrusion is tilted. It becomes easy to rotate the knob only in the direction.
[0018]
According to a sixth aspect of the present invention, there is provided the jam handling mechanism of the sheet conveying device according to the fifth aspect, wherein a biasing member that biases the protrusion from the tilted state to the standing state is provided.
[0019]
According to the sixth aspect of the present invention, since the protrusion is biased to the standing state, it can be arranged regardless of the mounting direction of Bob, and can cope with various mounting specifications.
[0020]
According to a seventh aspect of the present invention, in the jam handling mechanism of the sheet conveying apparatus according to any one of the first to sixth aspects, the knob has only the protrusion exposed from the cover of the jam handling mechanism.
[0021]
According to the seventh aspect of the present invention, the pressing portion of the knob can be limited, and the pressing operation of the operator can be easily guided in one direction.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view of an image forming apparatus 1 (here, a sheet post-processing apparatus 5 is also included) according to an embodiment of the present invention. The image forming apparatus 1 includes a printer 2, a scanner 3, an automatic document conveying device 4, a sheet post-processing device 5, a multi-stage paper feeding unit 6, a relay conveying unit 8, and a double-sided conveying path 10 connected to expand the function. Has been. The scanner 3 is disposed above the printer 2 and the sheet post-processing device 5 by being supported on the system rack 7 together with the automatic document feeder 4 disposed on the scanner 3.
[0023]
The printer 2 records and outputs image data from the externally connected device when an image processing apparatus such as a personal computer is connected, as well as recording output of the image read by the scanner 3.
In the printer 2, an electrophotographic process unit 20 centering on a drum-shaped photoconductor 200 is disposed on the substantially central right side of the apparatus main body in FIG.
Below the printer 2 main body, a paper supply unit 21 is disposed inside the printer 2 main body.
The paper supply unit 21 includes a paper storage tray 210 that stores paper and a separation supply unit 211 that separates and supplies the paper stored in the paper storage tray 210 one by one. The sheets separately supplied one by one from the sheet supply unit 21 are sequentially supplied between the photoconductor 200 and the transfer unit of the electrophotographic process unit 20, and the recorded and reproduced image is transferred onto the photoconductor 200. . The paper supply to the paper supply unit 21 is performed by pulling out the paper storage tray 210 to the front side of the printer 2 main body.
On the lower surface of the printer 2 main body, paper fed from a multi-stage paper feeding unit 6 or the like prepared as a peripheral device is received and sequentially supplied between the photoconductor 200 of the electrophotographic process unit 20 and the transfer unit. A paper receiving opening 27 is provided.
[0024]
A fixing device 23 is disposed above the electrophotographic process unit 20. The fixing device 23 is sequentially received, and the developer transferred onto the paper is heated and fixed to the outside of the fixing device 23. Send out. The sheet on which the image is recorded is transferred from the discharge roller 28 of the printer 2 to the relay conveyance unit 8 on the upper surface of the printer 2 body.
[0025]
The upper and lower spaces of the optical scanning unit 22 include a process control unit (PCU) substrate that controls the electrophotographic process, a printer control unit 24 that accommodates an interface substrate that receives image data from outside the apparatus, and an image received from the interface substrate. An image control unit 25 having an image control unit (ICU) substrate for performing predetermined image processing on the data and causing the optical scanning unit 22 to scan and record as an image, and power to these various substrates and units A power supply unit 26 for supplying power is disposed.
[0026]
The multi-stage paper feeding unit 6 is an external paper feeding device and includes three paper feeding units 61, 62, and 63. The sheets stored in the sheet storage trays 610, 620, and 630 of the respective sheet supply units 61, 62, and 63 are separated one by one by the separation feeding units 611, 621, and 631, and provided on the upper surface of the unit. The paper is supplied toward the paper discharge port 65 communicating with the paper receiving port 27 of the printer 2.
[0027]
In the present embodiment, during operation, the sheet supply units 61, 62, and 63 that store sheets of a desired size selectively operate. Paper supply to the paper supply units 61, 62, and 63 is performed by pulling out the paper storage trays 610, 620, and 630 to the front side of the unit body, and the paper supply units 62 and 63 have the same size. Paper is stored.
[0028]
Further, the multi-stage paper feeding unit 6 is configured to place the printer 2 and the post-processing device 5 on the upper part thereof. However, the multi-stage paper feeding unit 6 can be moved and fixed between the system racks 7 in this state. A moving roller 69 and a fixed portion 68 are provided at the bottom. At the time of movement, the fixing portion 68 is rotated and raised to separate the fixing portion 68 from the floor surface. At the time of fixing, the fixing portion 68 is rotated and lowered to bring the fixing portion 68 into contact with the floor surface. The paper feed unit 6 is fixed. In the present embodiment, a configuration including three paper supply units 61, 62, and 63 has been described. However, a plurality of paper supply units that contain paper of the same size are provided including the paper supply unit 21. It may be a configuration.
[0029]
The sheet post-processing device 5 performs post-processing on the paper by guiding the paper on which the image discharged from the relay conveyance unit 8 or the printer 2 is recorded by the carry-in roller 50 in the upper part of the device. The sheet post-processing apparatus 5 according to the present invention performs a stable process, and will be described in detail later.
[0030]
The scanner 3 automatically supplies a sheet document by the automatic document transport device 4 and sequentially exposes and scans the documents one by one to read a document image, and a book document or the automatic document transport device 4. A manual reading mode for reading a document image by manually setting a sheet document that cannot be automatically supplied is provided. Then, the image of the document set on the transparent document placing table 30 is exposed and scanned by the first scanning unit 31 and the second scanning unit 32 that move along the document placing table 30 with a predetermined speed relationship with each other. The original image is converted into an electrical signal and output by being guided by an optical component such as a mirror or an imaging lens 33 and forming an image on the photoelectric conversion element 34.
[0031]
The automatic document conveying device 4 includes a document conveying means 41 that conveys a document placed on the document setting tray 40 toward the document placing table 30 and discharges the scanned document onto a document discharge tray 42. Yes. In addition, the front side of the apparatus is opened so that a sheet document that cannot be automatically supplied can be placed on the document placement table 30 and scanned so that it can be scanned. It is configured.
[0032]
The relay conveyance unit 8 is mounted on an upper portion of a paper tray 29 provided on the top of the printer 2, and the sheet post-processing device 5 positioned on the downstream side of the printer 2 is used for recording paper on which images discharged from the printer 2 are recorded. It is the conveyance unit for introducing toward. Further, in the middle of the sheet conveyance path 84 of the relay conveyance unit 8, another sheet conveyance path 83 for guiding the sheet to the discharge tray 9 formed by the upper surface 82 of the unit and the upper surface 54 of the sheet post-processing device 5. However, it is branched. The two discharge destinations can be changed by switching the gate 81 arranged at the branch portion of the transport path.
[0033]
The discharge tray 9 is also used as a reverse conveyance path for paper, and realizes image formation on both sides of the paper in combination with the external duplex conveyance path 10.
Therefore, the discharge roller 28 can rotate in both forward and reverse directions. A gate 251 is provided on the downstream side of the fixing device 23 in the conveyance path that passes from the paper supply units 21, 61, 62, and 63 to the electrophotographic process unit 20 and the fixing device 23.
[0034]
The sheet on which the developer transferred onto the sheet has been fixed is discharged to the sheet post-processing device 5 or the discharge tray 9 when the gate 251 is switched to the solid line side in FIG. When the discharge tray 9 is used as a reverse conveyance path, the paper is pulled back and reversely conveyed to the conveyance path 250 via the gate 251 switched to the broken line side. In this way, image formation on both sides of the paper is possible.
[0035]
Next, the operation of the sheet conveying apparatus according to the embodiment of the present invention will be described.
Sheets separated and supplied one by one from the sheet feeding unit 21 or the other-stage sheet feeding unit 6 or the like prepared as a peripheral device pass through the pre-PS roller 221 to the PS roller 222 as shown in FIG. To be registered. After the registered paper leading edge comes to a normal position, it is sequentially supplied to the process unit 20. The sheet on which the image is transferred by the process unit 20 is sequentially conveyed to the fixing device 23, where the developer on the sheet is heated and fixed by the upper heat roller 231 and the lower heat roller 232, and after fixing, the sheet roller 233 is fixed. Are transported sequentially. Thereafter, the gate 251 distributes the path to the transport path 250 or the discharge roller 28.
[0036]
The paper is conveyed through the printer 2 by the rollers 221 to 233. At this time, a jam may occur. For example, when a paper jam occurs while the upper heat roller 231 and the lower heat roller 232 are jammed, it is necessary to pull out the paper in the direction opposite to the paper conveyance direction in order to prevent contamination by untransferred toner. Further, when a jam occurs with the PS roller 222 biting the paper, it is necessary to pull out the paper in the paper transport direction to prevent the sensor 229 (FIG. 5) from being damaged.
[0037]
As shown in FIGS. 3 and 4, the PS roller 222 is composed of a PS driving roller 222a and a PS driven roller 222b, and side plates 223 and 224 constituting a frame of the PS unit PSU are respectively supported by bearings 225 and 226, respectively. It is rotatably supported. The movement of the rollers 222a and 222b in the axial direction (thrust direction) relative to the side plates 223 and 224 is restricted by the E-ring 227, respectively. The PS driving roller 222a and the PS driven roller 222b are arranged to face each other at a predetermined interval so as to be able to sandwich and convey the sheet.
[0038]
As shown in FIG. 5, the jam release knob 228 is a disk-shaped knob having a predetermined thickness in which a plurality of protrusions C having a predetermined shape extending in a substantially radial direction are provided along the circumferential direction. The protrusion C has a shape in which the width in the circumferential direction gradually narrows as the distance from the center of the knob 228 increases, and the tip T is rounded. A more detailed shape of the protrusion C will be described later.
[0039]
The jam release knob 228 is fixed on the concentric shaft to the PS drive roller 222a by a comb screw 220 (FIG. 4) so that the rotational force applied by the user (operator) can be transmitted to the PS drive roller 222a. Yes. In this embodiment, the jam release knob 228 is directly fixed to the PS drive roller 222a so that the rotation direction, the rotation angle, and the like are the same. It may be provided so as to maintain the connection relationship. For example, by providing a connection mechanism between the jam release knob 228 and the PS drive roller 222a, the rotation direction, the rotation angle, and the like can be changed.
[0040]
Further, as shown in FIG. 5, the jam release knob 228 attached to the PS drive roller 222 a is positioned so that only the protrusion C portion of the jam release knob 228 protrudes from the side plate 223 from the PS unit PSU. That is, when the PS unit PSU is viewed from the operation side (the front side in FIG. 5), only the protrusion C of the jam release knob 228 is projected (exposed) from the side plate 223 on the front side of the PS unit PSU. Is provided as an operation unit.
[0041]
A sensor 229 (FIG. 5) for detecting the leading edge of the paper is provided on the upstream side of the PS roller 222 in the paper conveyance direction, and the paper position is confirmed by the sensor 229. In this case, the paper transport direction is the direction of arrow A (from bottom to top in FIG. 5). Since this sensor 229 needs to be moved by the paper, it is designed to be very light and easily damaged. Therefore, since it is necessary to turn the jam release knob 228 in the normal direction A, in the present invention, the configuration of the jam release knob 228 is assumed to be rotated in one direction with respect to the user.
[0042]
The protrusion C of the jam release knob 228 has, as side surfaces in the rotation direction, an operation surface 228a and a non-operation surface 228b that forms the back surface side through the operation surface 228a and a substantially U-shaped tip T. .
[0043]
The operation surface 228a is a surface (part) pressed by the operator when the jam release knob 228 is rotated forward, and is substantially perpendicular to the rotation direction R, that is, substantially coincident with the radial direction or in a substantially horizontal direction. It is the extended outer surface (part). Therefore, the operation surface 228a forms a surface substantially perpendicular to the linear pressing direction (from the top to the bottom in FIG. 5) PF applied to the protrusion C. The operation surface 228a can be formed as a flat surface or a curved surface in a range that does not impair the operability.
Further, a non-slip portion may be provided on the operation surface 228a in order to improve operability at the time of pressing. As the non-slip portion, for example, a fine uneven surface or a fine uneven member is provided on a flat or curved surface, so that the operation surface 228a can be prevented from slipping and the force can be transmitted reliably.
[0044]
The non-operation surface 228b is a surface that prevents the operator from intentionally pressing when the jam release knob 228 is rotated forward, and the operation surface 228a is in a position substantially perpendicular to the pressing direction PF. In this case, an obtuse angle (an angle greater than 90 degrees) is defined as an angle D1 formed with the tip T side portion of the non-operation surface 228b with respect to the non-pressing direction NF (upward from the bottom in FIG. 5) opposite to the pressing direction PF. Is formed (substantially parallel to R in the rotational direction). In the present embodiment, the angle D1 is formed at approximately 135 degrees. Further, the non-operation surface 228b of the present embodiment forms an angle D2 formed by the operation surface 228a of the adjacent protrusion C with an angle of about 100 degrees. The non-operation surface 228b can be formed as a flat surface or a curved surface.
With the above configuration, even if the user accidentally presses the non-operation surface 228b from the non-pressing direction NF, the pressing force is directed in the direction of the tip T along the slope of the non-operation surface 228b, and the pressing force that rotates the jam release knob 228 is applied. Cannot be rotated.
[0045]
As described above, when the jam release knob 228 is rotated in the forward direction R, the pressing force can be transmitted to the operation surface 228a without waste in order to form the operation surface 228a substantially perpendicular to the direction PF where the force is applied. By improving the operability (easy to transmit the pressing force), it is possible to make the operator intend the forward rotation direction of the jam release knob 228.
[0046]
Conversely, when the operator rotates the jam release knob 228 in the direction opposite to the normal rotation direction R, the non-operation surface 228b forms an obtuse slope in the reverse pressing direction NF where force is applied. Is not easily transmitted to the non-operation surface 228b, and the operability is also deteriorated in appearance, whereby the reverse rotation direction of the jam release knob 228 can be intended by the operator, and the reverse rotation can be prevented.
[0047]
Therefore, when performing jam processing, it is possible to reduce erroneous operation of the jam release knob 228 by the user, and to prevent the sensor 229 from being damaged.
In addition, since it has a mechanism that can define the rotation direction with only one component, it can be manufactured at a lower cost than when a one-way clutch is used.
[0048]
In the jam release knob 228 described above, the above-described effects can be achieved by providing the protrusion C. However, another embodiment of the jam release knob that further reduces the erroneous operation of the jam release knob by the user will be described below. .
[0049]
A jam release knob of a sheet conveying apparatus according to a second embodiment of the present invention will be described with reference to FIG. Note that the same parts as those described above are denoted by the same reference numerals and description thereof is omitted.
[0050]
In the jam release knob 228B of the present embodiment, a rib RI is formed on the non-operation surface 228b so as to be elongated in parallel with the rotation direction, so that a user's finger or the like can easily slide on the non-operation surface 228b. .
[0051]
The rib RI reduces the contact resistance between the user's finger and the jam release knob 228B, thereby reducing the contact resistance and making the user's finger pressing the non-operation surface 228b easy to slip. Therefore, the number, interval, width, and height (height from the non-operation surface 228b surface) of the ribs RI can be appropriately selected so as to exhibit the above-described effects.
[0052]
Next, a jam release knob of a sheet conveying apparatus according to a third embodiment of the present invention will be described with reference to FIG. Note that the same parts as those described above are denoted by the same reference numerals and description thereof is omitted.
[0053]
The jam release knob 228C of the present embodiment is provided with a rotating member RO on the non-operation surface 228b, and a user's finger pressing the non-operation surface 228b is slid by the rotation member RO.
[0054]
The rotating member RO is formed in, for example, a columnar shape or a cylindrical shape (including a disk), and is supported by an axis AX so as to be rotatable in the rotating direction of the knob 228. The rotating member RO is provided such that its outer periphery protrudes from the non-operation surface 228b and does not protrude from the operation surface 228a.
[0055]
With the above configuration, the user's finger pressing the non-operation surface 228b is easily slipped by the rotating member RO, and transmission of the rotational force to the knob 228 can be prevented.
In the present embodiment, the rotating member RO has been described as having a cylindrical shape, but the same effect can be achieved even when it is spherical. When the rotating member is spherical, the ball can be supported so as to be rotatable so that the user's finger pressing the non-operation surface 228b can easily slide in either direction.
[0056]
Next, a jam release knob of a sheet conveying apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. Note that the same parts as those described above are denoted by the same reference numerals and description thereof is omitted.
The jam release knob 228D of the present embodiment is provided with a slider SL1 that can move and return along the rotational direction on the non-operation surface 228b.
[0057]
The box-shaped slider SL1 is provided in the recess SL3 formed in the non-operation surface 228b so that the slider SL1 is urged toward the opposite side to the tip T by an elastic member (spring, rubber, etc.) SL2. ing. In the present embodiment, a spring spring is provided as the elastic member SL2.
In the present embodiment, the opening shape of the concave portion SL3 is rectangular. However, the present invention is not limited to this, and may be an opening shape that allows the slider SL1 to slide back and forth within a predetermined range along the rotation direction.
[0058]
According to the present embodiment, when pressing the non-operation surface 228b, the user's finger moves the slider SL1 in the direction of the tip T against the biasing force of the elastic member SL2, and the pressing force is applied to the elastic member SL2. Since the force is absorbed by the force, the pressing force of the user is not directly transmitted to the non-operation surface 228b, so that the transmission of the rotational force to the knob 228 can be further suppressed. Further, by using the elastic member SL2, the slider SL1 returns to the original position in the recess SL3 by stopping the pressing of the non-operation surface 228b.
[0059]
In the first to fourth embodiments described above, the case where the protrusion T is fixed to the jam release knob has been described. However, the present invention is not limited thereto, and in the following embodiments, the protrusion is not provided. A movable jam release knob will be described.
[0060]
A jam release knob of a sheet conveying apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. Note that the same parts as those described above are denoted by the same reference numerals and description thereof is omitted.
In the jam release knob 228E of the present embodiment, a plurality (six) of movable protrusions C2 are provided on the outer peripheral surface BNa of the regular hexagonal base knob BN, and the operation surface 228d of the movable protrusion C2 is located on the outer peripheral surface BNa. Thus, the configuration is such that the upright angle D3 can be provided in a direction opposite to the rotation direction R of the knob 228E from a state where the upright angle D3 is set to about 45 degrees.
In addition, since the standing angle D3 constitutes a tilt distance and an angle, it can be set to an arbitrary angle of 0 ° ≦ D3 ≦ 90 ° in consideration of the tilt distance, angle, operability and the like.
[0061]
The movable protrusion C2 is pivotally supported on a shaft AX2 provided at a portion that rotates in synchronization with the base knob BN so as to be rotatable in the rotation direction of the base knob BN. In addition, the movable protrusion C2 has an inclined surface 228c that contacts the outer peripheral surface BNa of the base knob BN so that the rotation of the movable protrusion T2 stops in a state where the operation surface 228d is raised at the rising angle D3 with respect to the outer peripheral surface BNa. And the edge part E is provided. The non-operation surface 228e of the movable protrusion C2 is provided on the back side of the operation surface 228d via the tip T, but the angle with the non-pressing direction is not limited. However, as in the case of the non-operation surface 228b described above, if the angle D1 between the non-operation surface 228e and the non-pressing direction is formed in a state where the movable protrusion C2 stands at the upright angle D3, the above-described effects can be obtained. it can.
[0062]
According to the configuration of the present embodiment, in the jam release knob 228E that rotates in the vertical direction, the movable protrusion C2 rotates with respect to the base knob BN about the axis AX2 by its own weight, and the rotation direction on the operation unit side. Therefore, it is easy to transmit the rotational force in the pressing direction PF, and when the rotational force in the non-pressing direction NF is applied to the movable projection C2, the movable projection C2 It becomes tilted and it becomes difficult to transmit the rotational force.
In addition, since the movable protrusion C2 can rotate while tilting in the unit PSU, the space required for the rotation of the jam release knob 228E can be reduced.
[0063]
In the above description, the movable protrusion T2 is rotated with respect to the base knob 228b by its own weight. However, the operation surface 228d can be tilted to the standing angle D3 with respect to the outer peripheral surface BNa of the base knob 228b. An urging member (an elastic member such as a spring or rubber) EL may be provided so as to be urged. With such a configuration, the arrangement direction of the jam release knob 228E is not limited to the rotation direction in the vertical direction, and can be arranged in any direction such as horizontal, and can correspond to various arrangements of the jam release knob 228E.
[0064]
As the urging member EL, for example, a leaf spring formed in a V shape is used, and is fixed to the outer peripheral surface BNa by adhesion or the like. With such a configuration, the movable protrusion T2 can be tilted more smoothly.
[0065]
【The invention's effect】
According to the first aspect of the present invention, when the knob is pressed and rotated, the rotational force is easily transmitted to the operation portion of the protrusion, and the rotational force is difficult to transmit to the non-operation portion of the protrusion. It becomes easy to rotate the knob only in one direction. Accordingly, it is possible to realize at a low cost only the shape of the knob to take out the sheet in one direction at the time of jam processing and prevent damage to parts due to erroneous operation of the knob and contamination due to untransferred toner.
[0066]
According to the second aspect of the present invention, the ribs are easily slipped and the rotational force is hardly transmitted to the non-operation part.
[0067]
According to the 3rd summary of this invention, it becomes easy to slip with a rotor, and also it becomes difficult to transmit a rotational force to a non-operation part.
[0068]
According to the fourth aspect of the present invention, when a pressing force is applied to the slide member, the slide member moves along the other surface, so that it is difficult to transmit the rotational force to the non-operation part. When the rotation operation is stopped, the slide member returns.
[0069]
According to the fifth aspect of the present invention, when the knob is pressed and rotated, the rotational force is easily transmitted when the protrusion is standing upright, and the rotational force is difficult to transmit when the protrusion is tilted. It becomes easy to rotate the knob only in the direction. Accordingly, it is possible to realize at a low cost only the shape of the knob to take out the sheet in one direction at the time of jam processing and prevent damage to parts due to erroneous operation of the knob and contamination due to untransferred toner.
[0070]
According to the sixth aspect of the present invention, since the protrusion is biased to the standing state, it can be arranged regardless of the mounting direction of Bob, and can cope with various mounting specifications.
[0071]
According to the seventh aspect of the present invention, the pressing portion of the knob can be limited, and the pressing operation of the operator can be easily guided in one direction.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a printer unit of the image forming apparatus according to the embodiment of the invention.
FIG. 3 is a perspective view of a PS unit of a sheet conveying mechanism according to an embodiment of the present invention.
FIG. 4 is an explanatory view showing a part of the PS unit of the sheet conveying mechanism according to the embodiment of the present invention in cross section.
FIG. 5 is a front view of the jam release knob according to the first embodiment of the present invention.
6A and 6B are a side view and a front view of a jam release knob according to a second embodiment of the present invention.
FIG. 7 is a front view of a jam release knob according to a third embodiment of the present invention.
FIGS. 8A and 8B are a side view and a front view of a jam release knob according to a fourth embodiment of the present invention.
FIG. 9 is a front view of a jam release knob according to a fifth embodiment of the present invention.
FIG. 10 is a front view of a jam release knob according to a fifth embodiment of the present invention.
[Explanation of symbols]
1 Image forming device
2 Printer
222a PS drive roller
222b PS driven roller
223 side plate
228-228E knob
228a, 228d Operation surface
A Paper feed direction
AX2 axis
BN base knob
BNa outer peripheral surface
D1 Angle between non-pressing direction NF and non-operation surface 228b
D3 Standing angle
EL biasing member
NF Non-pressing direction
PF pressing direction
R direction of rotation
RI Rib
RO Rotating member
SL1 slider
SL2 elastic member
T, T2 protrusion

Claims (7)

In the jam handling mechanism of the sheet conveying apparatus, which includes a driving roller and a driven roller for nipping and conveying the sheet, and a knob fixed to one end of the driving roller.
A plurality of protrusions are provided on the outer periphery of the knob in the rotation direction,
The protrusion is substantially perpendicular to the normal rotation direction of the knob, and when the operation portion is at a position substantially perpendicular to the pressing direction, the protrusion is in a non-pressing direction opposite to the pressing direction. And a non-operation portion that forms an obtuse slope toward the tip end portion of the protrusion. The jam handling mechanism of a sheet conveying apparatus according to claim 1, wherein the non-operation unit has a convex rib parallel to the rotation direction of the knob. The jam handling mechanism of the sheet conveying apparatus according to claim 1, wherein the non-operation unit includes a rotating member that can be rotated in any direction by a pressing force. The jam handling mechanism of a sheet conveying apparatus according to claim 1, wherein the non-operation portion includes a returnable slide member that receives a pressing force in a non-pressing direction and moves in the direction of the tip of the protrusion. In the jam handling mechanism of the sheet conveying apparatus, which includes a driving roller and a driven roller for nipping and conveying the sheet, and a knob fixed to one end of the driving roller.
A plurality of protrusions are provided on the outer periphery of the knob in the rotation direction,
The jam handling mechanism of a sheet conveying apparatus, wherein the protrusion is provided so as to be tiltable in a direction opposite to the rotation direction from an upright state at a predetermined angle with respect to an outer peripheral surface in a rotation direction of the knob. The jam handling mechanism of the sheet conveying apparatus according to claim 5, further comprising a biasing member that biases the protrusion from a tilted state to a standing state. 7. The jam handling mechanism of a sheet conveying apparatus according to claim 1, wherein only the projection of the knob is exposed from a cover of the jam handling mechanism.

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