JP2004051361A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device that facilitates the operation of jam handling for recording a paper sheet and that stabilize the conveyance property of the recording paper sheet. <P>SOLUTION: This image forming device includes a support member having a locking pin formed on a drawer unit that can be drawn and stored in a body of the device, a tilting member pivotably supported on the support member, being tiltable to a first position upward from the support member and to a second position downward from the support position, and a locking member pivotably supported on the tilting member, for being locked with the locking pin, and when the drawer unit is stored, the tilting member is pressed by the device body to be moved from the second position to the first position, the locking member is locked with the locking pin by being pressed by the device body, and when the drawer unit is drawn, the locking member is released from the locking pin by being pressed and released by the device body and the tilting member is movable from the first position to the second position. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus that forms an image on a recording sheet, and more particularly, to a recording sheet jam process.
[0002]
[Prior art]
2. Description of the Related Art In an image forming apparatus capable of forming an image on both sides of a recording sheet, usually, the recording sheet is sent to an image forming section of the apparatus to form an image on one side of the recording sheet, and then the recording sheet is again sent to the image forming section. By feeding and forming an image on the other side, an image is formed on both sides of the recording paper.
[0003]
In this image forming apparatus, a portion for sending the recording paper to the image forming means is configured as a drawer unit so as to be able to be taken out of the image forming apparatus main body, so that the jam of the recording paper in the conveyance path formed in the drawer unit is easily performed. It is configured.
[0004]
Here, an example of the related art will be described with reference to the drawings. FIG. 11 is a right side view showing a part of the configuration of the conventional drawer unit in the housed and drawn state. FIG. 11A is a cross-sectional view illustrating a state where the drawer unit is housed in the image forming apparatus main body, and FIG. 11B is a cross-sectional view illustrating a part of the state where the drawer unit is pulled out from the image forming apparatus main body.
[0005]
As shown in FIGS. 11A and 11B, the drawer unit 6 can be pulled out from the image forming apparatus main body A. Guide members (not shown) for guiding the drawer unit guide members 81 (82) are fixedly provided on the fixed frames A1 and A2 formed in the image forming apparatus main body A. The support members 6A and 6B of the drawer unit 6 and the locking pins 862 (863) are supported by the drawer unit guide member 81 (82). The drawer unit 6 can be pulled out from the image forming apparatus main body A in the direction of the arrow 41. The operation member 85 is provided on the tilting member 80 so as to be rotatable in the direction of the arrow 43. When the drawer unit 6 is stored in the image forming apparatus main body A, the tilting member 80 is locked to the drawer unit 6 by a locking member 86B (86A) that can rotate integrally with the operation member 85.
[0006]
When the tilting member 80 is housed in the image forming apparatus main body A, the locking pin 862 (863) is engaged with the locking member 86B (86A) that operates integrally with the operation member 85, and the tilting member is tilted. The member 80 is connected to the drawer unit 6 to form a re-feeding path (not shown) for recording paper.
[0007]
The drawer unit 6 can be moved in the direction of arrow 41 and pulled out from the image forming apparatus main body A as shown by a dashed line in FIG. Then, by rotating the operation member 85 as indicated by the arrow 43, the engagement between the locking pin 862 (863) and the locking member 86B (86A) can be released. Is rotated as indicated by an arrow 42, a re-feeding path (not shown) is opened, and a jammed recording sheet can be taken out.
[0008]
As shown in FIG. 11B, one end of a wire 88 is attached to the tilting member 80, and the other end of the wire 88 is connected to one end of a tension coil spring 87. The other end of the extension coil spring 87 is fixed to the frame of the drawer unit 6. Further, the tension coil spring 87 reduces the impact when the tilting member 80 descends. When the operating member 85 is separated from the operator's hand, it returns to its original position by a spring force (not shown).
[0009]
Next, when the drawer unit 6 is moved in the direction opposite to the arrow 41 to return from the position indicated by the dashed line to the position indicated by the solid line in FIG. The tilting member 80 is pushed up by the rollers 911 and 912 provided on the auxiliary guide member 91, and automatically returns to the position shown by the solid line in FIG. The tilting member 80 is locked to the drawer unit 6 by the action of the locking member 86B (86A) and the locking pin 862 (863).
[0010]
[Problems to be solved by the invention]
However, the above-described image forming apparatus has the following problems.
[0011]
1) Since the locking pin 862 does not come off unless the operation member 85 is tilted, the operation tends to be complicated.
[0012]
2) When the tilting member 80 is in the first position U (FIG. 11B), the locking pin 862 is locked to the locking member 86B, and the locking member 86B pushes the locking pin 862 upward. In particular, the pressure of the recording paper conveyance roller tends to be unstable.
[0013]
3) When the drawer unit 6 is stored in or pulled out of the image forming apparatus main body A, if the auxiliary guide member 91 and the roller members 911 and 912 are used, the structure becomes complicated, and a large force is required to open the locking member 86B. Therefore, the lifting force increases, the strength of the mounting member of the roller member is required, and a large space is required in the height direction of the image forming apparatus, and the height of the image forming apparatus tends to increase.
[0014]
4) When one end is fixed to the tilting member 80 and the other end is fixed to the supporting members 6A and 6B to provide a plurality of tension coil springs 87 which are the same elastic member, the weight of the tilting member 80 in the X direction is shifted. Accordingly, the balance of the force of the tilting member 80 is deteriorated, and the operation is likely to be unsmooth.
[0015]
5) One end is fixed to the tilting member 80 and the other end is fixed to the support member to provide a tension coil spring 87 as an elastic member. When the drawer unit 6 is pulled out from the image forming apparatus main body A, the tilting member 80 is moved to the second position. When the tilting member 80 is moved to the maximum open position D, it is necessary to provide another stopper member to hold the tilting member 80 at the maximum open position D.
[0016]
6) If the tilting member 80 and the support members 6A and 6B do not have the position regulating portions, the conveyance roller nip pressure in the conveyance path becomes unstable, and the conveyance of the recording paper tends to be unstable.
[0017]
7) If the support members 6A and 6B, the tilting member 80, and the bearing are made of metal processing parts, the cost tends to be high.
[0018]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus having a drawer unit for forming at least a part of a conveyance path of a recording sheet, which solves the above-mentioned problem of the related art.
[0019]
[Means for Solving the Problems]
The above object can be achieved by any of the following means.
[0020]
(1) An image forming apparatus main body, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body, and a support member having a locking pin formed in the drawer unit A tilting member pivotally supported by the support member and capable of tilting to a first position raised with respect to the support member and a second position lowered with respect to the support member; A locking member for locking to a locking pin, wherein when the drawer unit is stored in the image forming apparatus main body, the tilting member is pressed by the image forming apparatus main body and the first tilting member is pressed from the second position to the first position. Position, and the locking member is pressed by the image forming apparatus main body to lock the locking pin, and when the drawer unit is pulled out from the image forming apparatus main body, the locking member is in an image position. Image forming apparatus, wherein the locking member from the forming apparatus main body is released pressed out from the locking pin, further wherein the tilting member is movable to said second position from said first position.
[0021]
(2) An image forming apparatus main body, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body, and a support member having a locking member formed in the drawer unit A tilting member pivotally supported by the support member and capable of tilting to a first position raised with respect to the support member and a second position of maximum opening lowered with respect to the support member; And a roller member acting on the locking member, wherein when the tilting member is moved from the second position to the first position, the roller member is positioned near the first position. Wherein the roller member is disengaged from the engagement of the engagement member at a position where the tilting member is lowered from a position near the first position.
[0022]
(3) a main body of the image forming apparatus, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the main body of the image forming apparatus, a support member formed in the drawer unit, and the support member A tilting member that can be tilted to a first position raised with respect to the support member and a second position that is lowered with respect to the support member, and a roller member that is rotatably supported by the tilt member, When the drawer unit is stored in the image forming apparatus main body, the roller member is pressed by the image forming apparatus main body, and the tilting member moves from the second position to the first position, and moves from the image forming apparatus main body to the first position. When the drawer unit is pulled out, the roller member is released from the image forming apparatus main body, and the tilting member is movable from the first position to the second position. An image forming apparatus.
[0023]
(4) an image forming apparatus main body, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body, a support member formed in the drawer unit, and the support member A tilting member which is pivotally supported by and can tilt to a first position raised with respect to the support member and a second position lowered with respect to the support member, one end fixed to the tilting member and the other end fixed to the support member At least two elastic members having different elastic characteristics are fixed to each other, and the tilting member can be tilted between the first position and the second position by at least two elastic members while maintaining a balance of force. An image forming apparatus, comprising:
[0024]
(5) The image forming apparatus main body, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body, a support member formed in the drawer unit, and the support member A tilting member which is pivotally supported by and can tilt to a first position raised with respect to the support member and a second position lowered with respect to the support member, one end fixed to the tilting member and the other end fixed to the support member And a string member that does not shrink and is fixed to the main body. When the drawer unit is pulled out from the image forming apparatus main body, the tilting member is positioned at the second position of the maximum open position by the string member, and An image forming apparatus characterized by being held.
[0025]
(6) The image forming apparatus main body, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body, a support member formed in the drawer unit, and the support member A tilting member that is pivotally supported by and is tiltable to a first position raised with respect to the support member and a second position lowered with respect to the support member, wherein the tilting member is at the first position. An image forming apparatus, which is positioned by a regulating portion capable of holding a predetermined distance with respect to the support member.
[0026]
(7) The image forming apparatus main body, a drawer unit that forms a conveyance path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body, a support member formed in the drawer unit, and the support member And a tilting member that can be tilted to a first position raised with respect to the support member and a second position lowered with respect to the support member, wherein one of the support member and the tilt member is provided. An image forming apparatus provided with a bearing, wherein the bearing has openings in at least two directions substantially perpendicular to a center line in a thrust direction, and is formed by molding.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
The first and second embodiments of the present invention will be described step by step. In each of the drawings to be used, the left and right directions are X directions, the upper and lower directions are Y directions, and the front and rear directions are Z directions when the image forming apparatus is viewed from the front.
[0028]
(Embodiment 1)
An image forming apparatus according to a first embodiment of the present invention will be described. FIG. 1 is a front cross-sectional view showing a configuration of an image forming apparatus according to an embodiment of the present invention, FIG. 2 is a front cross-sectional view showing a part of a configuration of a conveyance path for recording paper, and FIG. 4 is a plan view showing the configuration of the drawer unit. FIG. 5 is a front cross-sectional view showing a part of the configuration of the drawer unit. FIG. 6 is a right side view showing a part of the configuration of the drawer unit in the housed state. 7, FIG. 7 is a right side view showing a part of the configuration of the drawer unit in the pulled-out state, FIG. 8 is a right side view showing a part of the configuration of the drawer unit in the housed state and the pulled-out state, and FIG. It is a bottom view and a rear view showing the configuration of FIG.
[0029]
First, a schematic configuration of the image forming apparatus will be described with reference to FIGS. As shown in FIGS. 1 and 2, the image forming apparatus includes an automatic document feeder 1 provided above an image forming apparatus main body A, and an image reading device 2, an image forming unit 3, and a recording device inside the image forming apparatus main body A. It has a paper storage means 4, a transport means 5, and the like.
[0030]
First, the automatic document feeder 1 is provided at an upper portion of the image forming apparatus main body A, feeds out documents one by one, conveys them to an image reading position of the document, and discharges the document after image reading. . The automatic document feeder 1 includes a document table 11 on which a document is placed, a document separating unit 12 for separating documents placed on the document table 11, and a document transport for transporting documents separated by the document separating unit 12. Means 13, a document discharge means 14 for discharging the document conveyed by the document conveyance means 13, a document discharge table 15 for receiving and placing the document discharged by the document discharge means 14, and both sides of the document. Original inverting means 16 for inverting the original when reading the image.
[0031]
The plurality of originals placed on the original placing table 11 are separated by the original separating means 12, and are conveyed one by one. The document separated and conveyed by the document separating means 12 is conveyed by the document conveying means 13, and the image of the document is read through the slit 21 by the image reading device 2 provided below. The document from which the image has been read is discharged onto a document discharge table 15 by the document discharge means 14. By the way, when reading images on both sides of the document, the document from which the image has been read is turned over by the document reversing means 16, conveyed again by the document conveying means 13, and slit by the image reading means. Through 21, an image on the back of the document is read. The document from which the image on the back side has been read is discharged onto the document discharge table 15 by the document discharge means 14. Such a process is repeated for the number of originals placed on the original placing table 11, and the image of the original is read.
[0032]
Further, the automatic document feeder 1 is configured to be integrally retractable, and the original is directly placed on the platen glass 22 by raising the automatic document feeder 1 and opening the platen glass 22. It is configured to be able to. As described above, in the present embodiment, the image reading is performed by the reading method of reading the image of the document while the document is transported by the document feeding unit 13 and the reading method of reading the image after stopping the document on the platen glass 22. Reading can be performed.
[0033]
The image reading device 2 is a unit that reads an image of a document and obtains image data, and is provided above the image forming apparatus main body A. The image reading device 2 is a slit 21 which is a slit-shaped opening for reading an image of a document being conveyed by the document conveying means 13 of the automatic document feeder 1, for directly placing (statically) the document. A platen glass 22 serving as a document table, a first mirror unit 23 integrating a lamp 231 serving as a light source for irradiating light on the document, and a first mirror 232 reflecting light reflected from the document. A second mirror unit 24 in which a second mirror 241 and a third mirror 242 that reflect light are integrated, and an image forming device that forms reflected light from a document on the slit 21 or on the platen glass 22 on a line CCD 26 described later. An imaging lens 25 as a means, and a line C as an image reading means for photoelectrically converting an optical image formed by the imaging lens 25 to obtain image information It has a D26.
[0034]
When the image reading device 2 reads a document fed by the automatic document feeder 1, the first mirror unit 23 and the second mirror unit 24 are located at the left end positions shown in FIG. 23 is located below the slit 21. Then, the document conveyed on the slit 21 by the document conveying means 13 is irradiated with light by a lamp 231, and the light reflected from the document is transmitted to a first mirror 232, a second mirror 241, a third mirror 242, an imaging lens The light enters the line CCD 26 through the line 25. The line CCD 26 photoelectrically converts incident light to read an image of a document. When the original is directly placed on the platen glass 22, the first mirror unit 23 and the second mirror unit 24 are moved rightward in FIG. Read the image.
[0035]
The image forming unit 3 is a unit that forms an image on a recording sheet that is being conveyed at a predetermined process speed based on the image data obtained by the image reading unit 2. The image forming unit 3 includes a photosensitive drum 31 which is an image carrier having a photoconductive photosensitive layer and carrying a toner image, a charger 32 for uniformly charging the photosensitive drum 31, and image information read by a line CCD 26. A laser writing system 33 which is an exposure means for exposing the photosensitive drum 31 to form a latent image on the basis of the image data; a developing device 34 for developing the latent image on the photosensitive drum 31 to form a toner image; A transfer device 35 for transferring the toner image carried on the body drum 31 onto the recording paper being conveyed; a separator 36 for separating the recording paper on which the toner image has been transferred from the photosensitive drum 31; The cleaning unit 37 includes a cleaning unit 37 that removes toner remaining on the photosensitive drum 31 and a fixing unit 38 that fixes a toner image on recording paper. Around the photosensitive drum 31, a charger 32, a laser writing system 33, a developing unit 34, a transfer unit 35, a separator 36, and a cleaning unit 37 are arranged.
[0036]
The photoreceptor drum 31 is rotated in the direction of the arrow (FIG. 2) by driving means (not shown), and is uniformly charged by the charger 32, and is exposed in synchronization with the leading end of the recording paper sent from the registration roller 56 described later. Is started, the latent image is formed by the laser writing system 33, and the development is performed by the developing device 34, so that a toner image is formed based on the image information read by the line CCD 26. The formed toner image is transferred by a transfer unit 35 onto a recording paper that is separately conveyed. The recording paper to which the toner image has been transferred is separated from the surface of the photosensitive drum 31 by the separator 36, and is conveyed to the fixing means 38, where the toner image is fixed on the recording paper by the action of heating and pressing. On the other hand, the photosensitive drum 31 on which the toner image has been transferred onto the recording paper continues to rotate, and the cleaning unit 37 removes the toner remaining on the photosensitive drum 31 and is used for the next image formation.
[0037]
In the present embodiment, a conveyance roller 39 that conveys the recording paper sent from the registration roller 56 is provided in the vicinity of the photoconductor drum 31 between the photoconductor drum 31 and the registration roller 56. This contributes to an increase in the transfer power of Further, between the separator 36 and the fixing means 38, the lower surface side (the side opposite to the image-formed side) of the recording paper is supported for conveying the recording paper separated by the separator 36, A transport belt 391 for transport is provided.
[0038]
The recording paper storage means 4 is a recording paper storage means for storing a plurality of recording papers in a stacked state. In this embodiment, the recording paper storage means 4 has a plurality of recording paper storage means 4A, a second recording paper storage means 4B, and a third recording paper storage means 4C. To 4C are arranged below the image forming means 3 in multiple stages. As the recording paper stored in these recording paper storage units 4A to 4C, there are various recording media such as OHT, in addition to recording paper such as plain paper and recycled paper.
[0039]
Next, the transporting means 5 is a transporting means for transporting the recording paper from the recording paper storing means 4 to the image forming means 3, and the recording paper stored in each of the recording paper storing means 4A to 4C is transferred to the image forming means 3. The recording paper supply means 4X is configured to be able to carry the recording paper.
[0040]
The transporting means 5 will be described in detail with reference to FIG. The transport of the recording paper by the transport means 5 is performed along a recording paper transport path (no reference numeral). That is, as shown in FIG. 2, the recording paper stored in each of the recording paper storage units 4A to 4C passes through the first conveyance path a for sending out the recording paper from the recording paper storage unit 4 and the first conveyance path a. The sheet is transported along a transport path having an intermediate transport path b for transporting the fed recording paper and a second transport path c for transporting the recording paper transported via the intermediate transport path b to the image forming unit 3. It is conveyed by the means 5. The first transport path a is a transport path from the recording paper storage unit 4 to the pre-registration roller 53, and is a transport path in the right direction (substantially horizontal direction) in FIG. The intermediate conveyance path b is a conveyance path from the pre-registration roller 53 to the loop forming roller 55, and is a conveyance path extending vertically upward in FIG. The second conveyance path c is a conveyance path from the loop forming roller 55 to the transfer device 35, and is a conveyance path to the left in FIG.
[0041]
Then, the recording paper is transported in the order of the first transport path a, the intermediate transport path b, and the second transport path c. In the present embodiment, the first transport path a is provided in each of the recording paper storage units 4A to 4C. Further, the intermediate transport path b is a transport path that is at least partially shared, that is, in the middle of the intermediate transport path b for the recording paper from the third recording paper storage means 4C, the second recording paper storage means 4B. This is a common transport path where the recording paper from the first recording paper storage unit 4A is merged with the recording paper. The second transport path c is configured to be able to transport the recording paper from each of the recording paper storage units 4A to 4C to the image forming unit 3.
[0042]
Next, each configuration (means) of the transport means 5 will be described. The conveying means 5 is a pickup roller 51 which is a sending means which is disposed above the recording paper storage means 4 and which sends out the recording paper stored in the recording paper storage means 4, and the recording paper fed by the pickup roller 51 one by one. Separating means 52 (also serving as a first loop forming means) including a separating conveying roller 521 and a separating retard roller 522 for separating, the recording paper separated by the separating means 52 is once abutted, and then the conveyance is resumed. A pre-registration roller 53 as a first abutting means, a plurality of intermediate conveyance rollers 541 to 543 as intermediate conveyance rollers for conveying the recording paper conveyed by the pre-registration roller 53, and conveyance of the recording paper conveyed by the intermediate conveyance roller The second loop forming means is a loop forming roller 55, which is conveyed by the loop forming roller 55. Recording paper has a resist roller 56 and the transport roller 39 is a second abutment means for resuming the conveyance after abuts once.
[0043]
The first skew correcting means is composed of a pre-registration roller 53 serving as a first abutting means and a separating means 52 serving as a first loop forming means. This is a means for correcting. Further, it is preferable that a loop forming guide 572 described later is provided in the first bending correcting means. The second skew correcting means includes a registration roller 56 serving as a second abutting means and a loop forming roller 55 serving as a second loop forming means. This is a means for correcting. Further, it is preferable that the second bending correcting means includes a loop forming guide 581 described later.
[0044]
The pickup roller 51, the separation means 52 including the separation conveyance roller 521 and the separation retard roller 522, and the pre-registration roller 53 have the same function (the book registration means) corresponding to each of the recording paper storage means 4A to 4C. (Even in the embodiment, the same structure is also provided.) In the drawings, A to C are attached after the respective symbols, but the symbols A to C are not given for explanation. In some cases, the same can be said for all.
[0045]
The pickup roller 51 is a feeding unit that is disposed above the recording paper storage unit 4 and that sends out the recording paper stored in the recording paper storage unit 4. The pickup roller 51 is provided so as to be vertically movable by driving means (not shown in FIG. 2). When the pickup roller 51 is moving to the lower position, it is located on the first transport path a and is stored in the recording paper storage means 4. The uppermost recording sheet can be sent out by contacting the uppermost recording sheet among the plurality of recording sheets and driven by a driving unit (not shown) to rotate in the direction of the arrow. When the pickup roller 51 is moving to the upper position, the pickup roller 51 is at a position separated from the recording paper. The recording paper storage means 4 is pushed up by means such as a bottom plate (not shown) so that the upper positions of the plurality of stored recording papers are always the same.
[0046]
The separating unit 52 is a unit that separates the recording paper sent out by the pickup roller 51 one by one, and is provided in the first conveyance path a. In the present embodiment, a separation conveyance roller 521 and a separation retard roller 522 are provided. The separation conveyance roller 521 is a roller that comes into contact with the upper surface of the recording paper to be conveyed and is rotated by a driving unit (not shown) in a direction indicated by an arrow. It is a roller for conveying paper. The judgment retard roller 522 is a roller in which a torque limiter is incorporated, and is a roller that cooperates with the judgment conveyance roller 521 to separate the recording paper sent out by the pickup roller 51 one by one. The separating means 52 also serves as a first loop forming means constituting a first bend correcting means for correcting a bend of the recording sheet, as described later.
[0047]
In the present embodiment, the pickup roller 51 for feeding out the recording paper stored in the recording paper storage means 4 and the separating means 52 for separating the recording paper one by one are provided with separate functions, but these are integrally functioned. It may be a sending means. For example, a belt may be suspended between the pickup roller 51 and the separation conveyance roller 521, and the separation retard roller 522 may be brought into contact with the belt to provide a unit that functions integrally. In this case, as will be described later, the sending means also serves as a first loop forming means which constitutes a first bend correcting means for correcting a bend of the recording paper.
[0048]
The pre-registration roller 53 is a first abutting means for once abutting the recording paper separated by the separating means 52 and restarting the conveyance, and is a so-called registration roller. The pre-registration roller 53 is constituted by a pair of opposing rollers, and is provided on the first transport path a so as to be rotatable in the direction indicated by an arrow by driving means (not shown). The pre-registration roller 53 stops rotating when the recording paper is conveyed by the separating means 52. Therefore, the conveyed recording paper once hits the pre-registration roller 53, and the leading end thereof stops. I'm sullen. Thereafter, the rotation of the pre-registration roller 53 is started, and the recording paper is conveyed again by the pre-registration roller 53. As described above, by once abutting the recording paper against the pre-registration roller 53, the timing of the leading end of the recording paper can be accurately obtained, and the variation in conveyance can be suppressed.
[0049]
In the present embodiment, even when the leading end of the recording sheet abuts on the pre-registration roller 53, the conveyance of the recording sheet by the separating means 52 is continued, whereby the recording in which the leading end is stopped is performed. Loops can be formed in the paper to correct the paper skew. In this embodiment, the width of the pre-registration roller 53 (the length in the direction perpendicular to the recording paper conveyance direction) is set to the pickup roller 51 provided at the center in the direction perpendicular to the recording paper conveyance direction. A wider roller (preferably, a fixed-size recording sheet having a width substantially equal to the maximum size in which an image can be formed in the width direction) than the separating conveyance roller 521 and the separating retard roller 522. With this configuration, it is possible to surely correct the bending and to suppress variations in the conveyance.
[0050]
Further, in the present embodiment, in order to surely perform the loop formation, an upper guide 571 and a lower guide 572 are provided between the separating means 52 and the pre-registration roller 53 as guide members for guiding the conveyance of the recording paper. Is provided. In the present embodiment, the lower guide 572 is formed in an inverted mountain shape in a cross-sectional shape (when viewed as shown in FIGS. 1 and 2), and a loop is formed along the lower guide 572 to guide the recording paper. It functions as a guide. It is preferable to provide this loop forming guide as a bending correcting means.
[0051]
As described above, in the present embodiment, the leading end of the recording paper is abutted against the pre-registration roller 53 whose rotation is stopped, and the conveyance of the recording paper by the separation unit 52 is continued, so that a loop is formed on the recording paper. Then, it is configured to reliably correct the bending of the paper.
[0052]
The intermediate transport rollers 541 to 543 are intermediate transport rollers that transport the recording paper transported by the pre-registration rollers 53. The intermediate transport rollers 541 to 543 are provided on the intermediate transport path b. In the present embodiment, each of the intermediate transport rollers 541 to 543 is configured by a pair of opposing rollers, and is rotated in a direction indicated by an arrow by a driving unit (not shown). The intermediate transport roller 541 is a roller that transports the recording paper transported by the pre-registration rollers 53A to 53C, that is, transports the recording paper from the first recording paper storage unit 4A to the third recording paper storage unit 4C. The intermediate transport roller 542 is a roller that transports the recording paper transported by the pre-registration rollers 53B and 53C, that is, transports the recording paper from the second recording paper storage unit 4B and the third recording paper storage unit 4C. The intermediate transport roller 543 is a roller that transports the recording paper transported by the pre-registration roller 53C, that is, transports the recording paper from the third recording paper storage unit 4C.
[0053]
The loop forming roller 55 is a unit that conveys the recording paper conveyed by the intermediate conveyance roller 541. The loop forming roller 55 is constituted by a pair of opposing rollers, and is provided at one end of a movable frame 551 where one of the loop forming rollers 55 is opened. Further, it is provided on the second transport path c so as to be rotatable in a direction indicated by an arrow by driving means (not shown). The loop forming roller 55 also serves as a second loop forming unit constituting a second bending correcting unit for correcting the bending of the recording sheet, as described later.
[0054]
The registration roller 56, which is a synchronous conveyance unit, is a second abutting unit that once abuts the recording paper conveyed by the loop forming roller 55 and restarts conveyance. The registration roller 56 is composed of a pair of opposed rollers, and is provided on the second transport path c so as to be rotatable in the direction indicated by an arrow by a driving unit (not shown). The registration roller 56 stops rotating when the recording paper is conveyed by the loop forming roller 55. Therefore, the conveyed recording paper once hits the registration roller 56, and the leading end thereof stops. Can be Thereafter, the rotation of the registration rollers 56 is started, and the recording paper is re-conveyed by the registration rollers 56. Then, in synchronization with the recording paper sent from the registration roller 56, the formation of the latent image by the laser writing system 33 is started, and the recording paper and the toner image on the photosensitive drum 31 are synchronized. As described above, the recording paper is once abutted against the registration rollers 56 and then transported again, so that the timing of the leading edge of the recording paper can be accurately obtained, the variation in transport can be suppressed, and the laser writing system can be controlled. 33 can be easily synchronized, and an image can be formed at an accurate position on the recording paper.
[0055]
In the present embodiment, even when the leading edge of the recording sheet abuts against the registration roller 56, the conveyance of the recording sheet by the loop forming roller 55 is continued, whereby the recording in which the leading end is stopped is performed. Paper loops can be formed to correct paper skew. Further, in the present embodiment, in order to surely perform the loop formation, an upper guide 581 and a lower guide 582 are provided between the loop forming roller 55 and the registration roller 56 as guide members for guiding the conveyance of the recording paper. Is provided. In the present embodiment, the upper guide 581 is formed in a mountain shape with a cross-sectional shape (when viewed as shown in FIGS. 1 and 2), and a loop forming guide for guiding the recording paper in a loop shape along the upper guide 581. Function. A pair of transport rollers 39 is provided downstream of the upper guide 581 and the lower guide 582, and a light source L (L1), which is a means for detecting the transport state of the recording sheet, is provided between the transport rollers 39 and the registration rollers 56. , A detection member S (S1).
[0056]
The recording paper stored in the first recording paper storage means 4A by the transport means 5 having such a configuration (means) is picked up by a pickup roller 51A, a separating means 52A, a pre-registration roller 53A, an intermediate transport roller 541, a loop forming roller. The sheet is conveyed to the image forming unit 3 by a registration roller 55 and a registration roller 56. Similarly, the recording paper stored in the second recording paper storage unit 4B is imaged by the pickup roller 51B, the separation unit 52B, the pre-registration roller 53B, the intermediate conveyance rollers 542 and 541, the loop forming roller 55, and the registration roller 56. The recording paper conveyed to the forming means 3 and stored in the third recording paper storing means 4C is a pickup roller 51C, a separating means 52C, a pre-registration roller 53C, intermediate conveying rollers 543, 542, 541, a loop forming roller 55, Then, the sheet is conveyed to the image forming unit 3 by the registration roller 56.
[0057]
The present embodiment has a drawer unit 6 as shown in FIG. 3, and the drawer unit 6 has a re-feeding unit that reverses the recording paper on which an image is formed on one side and conveys it to the image forming unit 3 again. The paper unit, a part of the transporting unit 5, the fixing unit 38, and the sheet discharging unit are mounted, and are configured to be able to be pulled out from the image forming apparatus main body A as shown in FIGS. That is, although the drawer unit 6 includes the sheet re-feeding unit, the fixing unit 38, and the sheet discharging unit, the drawing unit 6 may be configured to include only the sheet re-feeding unit.
[0058]
As described later, the drawer unit 6 is configured to re-feed the recording sheet on which the image is formed by the image forming unit 3 to the image forming unit 3 on the recording sheet conveyed by the conveying unit 5 as described later. And a fixing discharge roller 61 for discharging the recording paper on which the toner image is fixed from the fixing means 38, and a method of discharging the recording paper discharged by the fixing discharge roller 61 as it is to the outside of the apparatus, and a method of reversing the recording sheet after turning over the sheet. Switching means 62 for switching the conveyance path when the sheet is fed or re-fed for forming an image on the back side, reversing means 65 for reversing the front and back of the re-fed recording paper, and recording reversed by the reversing means 65 A re-feed path 66 for re-feeding the paper to the image forming means 3 is provided.
[0059]
When the recording paper on which an image is formed is discharged as it is, that is, with the image-formed surface facing upward, the switching unit 62 is positioned at a position shown by a dashed line in FIGS. The recording paper is discharged to a discharge tray 64 outside the apparatus by the paper roller 63. When the recording sheet on which the image is formed is turned upside down and ejected, that is, when the image is ejected with the surface on which the image is formed on the lower side, the switching unit 62 is positioned at the position shown by the solid line in FIGS. Then, the recording paper conveyed by the fixing discharge roller 61 is once conveyed in the direction of the reversing means 65, and after the recording paper passes through the switching means 62, the conveyance direction is reversed, and Is discharged to the discharge tray 64. On the other hand, when an image is to be formed on the back surface of the recording paper, the switching unit 62 is positioned at the position shown by the solid line in FIG. 1, and the recording paper conveyed by the fixing discharge roller 61 is conveyed in the direction of the reversing unit 65. By performing switchback by means 65, the sheet is turned upside down and conveyed to the re-feeding path 66. The recording paper conveyed to the paper re-feed path 66 joins the conveyance path between a loop forming roller 55 described later and an intermediate conveyance roller 541 described later, and the image is formed in the same manner as the paper supply from the recording paper storage unit 4. It is transported to the forming means 3.
[0060]
Next, a description will be given of a processing mechanism in the drawer unit according to the present embodiment when a recording sheet conveyed by the conveyance unit has a conveyance failure.
[0061]
As shown in FIG. 3, after the recording paper on which the toner image formed on the photosensitive drum 31 is transferred by the transfer unit 35 is separated from the photosensitive drum 31 by the separator 36, the recording paper is transported to the fixing unit 38. Transport member 391 is provided. A switching unit 62 and a pair of conveying rollers 57 are provided as means for conveying the recording sheet fixed by the fixing unit 38 to the reversing unit 65 without discharging the recording sheet to the sheet discharging unit 621.
[0062]
The drawer unit guide members 81 and 82 slidably provided on fixed frames A1 and A2 (shown in FIG. 4) fixed to the image forming apparatus main body A are connected to both ends of support members 6A and 6B formed in the drawer unit 6. The drawer unit 6 is supported and fixed, and can be pulled out from the image forming apparatus main body A to the near side in the drawing. At the lower position of the drawer unit 6, a tilting member 80 (shown in FIG. 6) having one end rotatably supported on the drawer unit 6 is provided to open the refeeding path 66 of the drawer unit 6. . Transport rollers 70 and 71 are provided on the drawer unit 6 side, and a transport roller 701 and a transport roller 711 are provided on the tilting member 80 side so as to be paired with the transport rollers 70 and 71, respectively. A reversing means 65 for switching back the recording paper conveyed by the pair of conveying rollers 70 and 701 and the conveying rollers 71 and 711 is provided in the drawer unit 6, and the reversing means 65 has a pair of left and right rotatable conveying rollers 651. And a recording paper guide 77 for guiding the recording paper to be switched back.
[0063]
Further, transport rollers 72, 73, 74, and 75 are provided on the drawer unit 6 side to transport the switched back recording paper to the re-feeding path 66, and the transport rollers 72, 73, 74, and 75 are provided on the tilting member 80 side. The transport rollers 721, 731, 741, and 751 are provided so as to be paired with 75. In order to transport the recording paper fed in the re-feed path 66 to the transfer position again, a pair of transport rollers 76, a loop forming roller 55, a registration roller 56, and a transport roller 39 are provided on the drawer unit 6 side. I have.
[0064]
Further, a movable guide member 551 that opens the loop forming roller 55 and a plurality of movable guide members 551 provided downstream of the registration rollers 56 and arranged in a direction perpendicular to the recording paper transport direction to detect the transported recording paper. And a movable guide member 561 for opening the gap between the registration roller 56 and the pair of transport rollers 39 together with the light source L and the light receiving element S. The light source L is provided on the movable guide member 561, and the light receiving element S is provided on the movable guide member 561. , Supporting members 6A and 6B. A sensor including a plurality of light sources L and a plurality of light receiving elements S detects the leading edge of the conveyed recording paper, and detects the conveyance timing, inclination, and deviation of the recording paper from the detection result.
[0065]
Next, the operation of conveying the recording paper by the conveying means 5 will be described with reference to FIG. Note that, as described above, the recording paper stored in any of the recording paper storage units 4A to 4C is transported in the same manner. The paper transport will be described.
[0066]
When a feed start signal is received from a control unit (not shown), first, the pickup roller 51A is moved to the lower position, and then the pickup roller 51A and the separation conveyance roller 521 are rotated in the direction indicated by the arrow. As a result, the uppermost recording sheet out of the plurality of recording sheets stored in the first recording sheet storage unit 4A is sent out and separated one by one by the separation unit 52A (the separation conveyance roller 521A and the separation retard roller 522A). Transported. Then, the recording paper separated and conveyed by the separation means 52A hits the non-rotating pre-registration roller 53A. When the recording paper is conveyed by the separating means 52A, the rotation of the pickup roller 51A is stopped, and the pickup roller 51A is moved to the upper position.
[0067]
Even after the recording paper strikes the pre-registration roller 53A, the conveyance of the recording paper by the separation means 52A is continued. Therefore, the recording paper whose leading end is stopped by the pre-registration roller 53A forms a loop between the pre-registration roller 53A and the separation means 52A by being further conveyed by the separation means 52A. At this time, the formed loop is reliably formed in an appropriate shape by the upper guide 571 and the lower guide 572, and a sufficient loop can be formed, so that the paper bending can be reliably corrected. .
[0068]
Here, the pre-registration restart signal is not limited to the case where there is a preceding recording sheet and the case where the preceding recording sheet is being conveyed by the loop forming roller 55 or the intermediate conveyance roller 541. However, when the recording paper to be re-conveyed from the pre-registration roller 53A does not overlap with the preceding recording paper, re-conveyance may be started.
[0069]
Then, the recording paper transported by the pre-registration roller 53A is transported by the intermediate transport roller 541 on the intermediate transport path b, and further transported by the loop forming roller 55. The recording paper conveyed by the loop forming roller 55 hits a non-rotating registration roller 56. Even after the recording paper strikes the registration roller 56, the conveyance of the recording paper by the loop forming roller 55 is continued. Accordingly, the recording paper, the leading end of which is stopped by the registration roller 56, is formed with a loop between the registration roller 56 and the loop formation roller 55 by being further conveyed by the loop formation roller 55. At this time, the formed loop is reliably formed in an appropriate shape by the upper and lower guides 581 and 582, and a sufficient loop can be formed, and the transport between the pre-registration roller 53A and the registration roller 56 is performed. Correction of the paper skew caused by the above can be surely performed.
[0070]
When an appropriate loop is formed on the recording paper, conveyance by the loop forming roller 55 is stopped, and rotation of the registration roller 56 is started based on a registration restart signal from the control unit. The rotational speed of the registration roller 56 is the same as the process speed at which the image forming unit 3 forms an image. Therefore, the recording sheet that has stopped after hitting the registration roller 56 is conveyed at an accurate timing together with the start of rotation based on the registration restart signal. At this time, the loop forming roller 55 is driven to rotate in synchronization with the registration roller 56.
[0071]
By the way, in the present embodiment, a recording paper supply unit composed of the recording paper storage unit 4, the pickup roller 51, the separation unit 52, the pre-registration roller 53, and the upper guide 571 and the lower guide 572 shown in FIGS. The means 4X is unitized, and the recording paper supply means 4X is provided on the front face of the copying machine so as to be integrally pulled out. Therefore, when the recording paper is exhausted in the recording paper storage means 4, the recording paper supply means 4X can be pulled out to replenish the recording paper. Further, when various types of recording paper are used, paper jams are likely to occur near the feeding and separation. Therefore, when only the recording paper storage means 4 is provided so as to be able to be pulled out, the jammed paper is pinched by rollers. State, which complicates the process at the time of pulling out. However, as in the present embodiment, the unit can be pulled out while being sandwiched by the rollers, thereby facilitating the processing of the paper jam. It can be done reliably.
[0072]
The pickup roller 51, the separation means 52 including the separation conveyance roller 521 and the separation retard roller 522, the pre-registration roller 53, and the upper guide 571 and the lower guide 572 correspond to the respective recording paper storage means 4A to 4C. The recording paper supply means 4X is provided corresponding to each of the recording paper storage means 4A to 4C (as shown in the drawing, the first recording paper supply means 4AX to The first recording paper supply means 4AX to the third recording paper supply means 4CX are independently provided so as to be drawn out to the copying machine.
[0073]
The recording paper conveyed from the recording paper storage units 4A to 4C in this manner is sequentially conveyed between the photosensitive drum 31 and the transfer unit 35 by the loop forming roller 55, the registration roller 56, and the conveyance roller 39, and the toner image is formed. After the transferred recording paper is separated from the photosensitive drum 31 by the separator 36, the recording paper is transported to the fixing unit 38 by the transport unit 391. After the conveyance, in the case of single-sided recording, the switching means 62 is moved to the position indicated by the dashed line and discharged to the external discharge tray 64 via the discharge section 621.
[0074]
In the case of performing double-sided recording, as shown in FIG. 3, the recording paper fixed by the fixing unit 38 is not discharged to the paper discharging unit 621, and the recording paper is re-fed to the pull-out unit 6 by the solid line position switching unit 62. Then, the pair of transport rollers 70, 701, 71, and 711 and the transport roller 651 are transported to the recording paper guide unit 7 via the transport roller 57, and the transport roller 651 holding the rear end of the recording paper is switched back. Then, the sheet is fed to the re-feeding unit 66 by the pair of conveying rollers 72, 721, 73, 731, 74, 741, 75, 751, and the loop forming roller 55, the registration roller 56, The sheet is conveyed between the photosensitive drum 31 and the transfer unit 35 by the roller 39, the both sides of the recording sheet are recorded by recording the back surface thereof, separated by the separator 36, fixed by the fixing unit 38, and externally discharged. 64 to discharge.
[0075]
A recording paper guide member 90 that guides the recording paper transported by the pair of transport rollers 76 and that is openably provided is provided. The recording paper guide member 90 is always fixed by suction in the direction of the recording paper conveyance path by a suction member 901 such as a magnet. Next, on the downstream side of the recording paper guide member 90, one end of an openable movable guide member 551 is rotatably provided along a recording paper transport path of the support members 6A and 6B by a support shaft 552. One end of the pair of loop forming rollers 55 is provided at the distal end of the movable guide member 551, and the other loop forming roller 55 is provided on the supporting members 6A and 6B, so that the pair of loop forming rollers 55 is provided. It is formed in the state of. Further, the movable guide member 551 is constantly urged in the closing direction by the urging member 553 provided on the support shaft 552 so that the pair of loop forming rollers 55 come into contact with a constant pressure. Further, an opening handle 554 is formed at the tip of the movable guide member 551, and the movable guide member 551 is opened as shown by a dashed line against the urging member 553, so that the pair of loop forming rollers 55 can be separated. are doing.
[0076]
Further, the movable guide member 561 provided on the downstream side of the movable guide member 551 and having the light source L (L1) facing the light receiving element S (S1) has a dashed line with the position of the pair of transport rollers 56 as a support axis. As shown, it is provided so as to be openable, and the other end is provided with one transport roller 39 and a handle 563. By opening the movable guide members 551 and 561 in this manner, it is possible to easily eliminate the jam of the recording paper in the upstream portion of the transfer device 35.
[0077]
Conventionally, it has been difficult to remove a jam in the upstream portion of the transfer unit 35 because the portion is very narrow. However, such a problem has been solved by a jam removing mechanism.
[0078]
Next, the configuration of the drawer unit withdrawal and storage will be described with reference to FIG. 4, FIG. 6, FIG. 7, and FIG.
[0079]
The drawer unit 6 is provided below the photosensitive drum 31 provided in the image forming apparatus. Further, as described above, the drawer unit 6 forms a transport path for a part of the recording paper that can be pulled out and stored in the image forming apparatus main body A, and has a transport roller for re-feeding the transfer paper.
[0080]
By operating the operation lever 84 (FIG. 4), the drawer unit 6 can be pulled out from the image forming apparatus main body A by being guided by the drawer unit guide members 81 and 82. The elastic member 99 (FIG. 6) is provided on the main body guide member 97 and acts on the locking member 86B (86A).
[0081]
Guide members 81A and 82A are fixedly provided on fixed frames A1 and A2 formed in the image forming apparatus main body A. The guide members 81A and 82A guide the drawer unit guide members 81 and 82. Both ends of the support members 6A, 6B are supported by the drawer unit guide members 81, 82. The support member 6B has locking pins 862 (863). The operating member 85 is formed integrally with the tilting member 80.
[0082]
Positioning members 6C, 6D, 6E, and 6F are provided on the fixed frames A1 and A2, and the drawer unit 6 is installed at a predetermined position of the image forming apparatus main body A. The support members 6A and 6B are provided with locking portions 83 (FIG. 4). The locking portions 83 are locked to the fixed frame body A1 to hold the drawer unit 6 with the image forming apparatus main body A. Maintain state.
[0083]
The tilting member 80 is pivotally supported by the support member 6A, and can tilt to a maximum open position D which is a first position U raised with respect to the support members 6A and 6B and a second position lowered with respect to the support members 6A and 6B. Has become.
[0084]
The locking member 86B (86A) is integrated with the bent part 86Ba and the formed cam part 86Bb. The locking member 86B (86A) is supported by the tilting member 80 and locked to the locking pin 862 (863). The first position U of the tilting member 80 is located closer to the support members 6A, 6B, and the maximum open position D, which is the second position, is inclined downward by a predetermined amount with respect to the support members 6A, 6B. It is in the position that I did.
[0085]
The roller member 96 (FIG. 8) is supported by the tilting member 80 and acts on the locking member 95. When the tilting member 80 is at the first position U, the roller member 96 is locked by the locking member 95, and holds the tilting member 80 near the first position U. When the tilting member 80 is at the maximum open position D, the roller member 96 is released from the engagement of the engagement member 95 halfway. When in the first position U, there is a gap between the locking member 95 and the roller member 96.
[0086]
One elastic member 87 provided on each of the left and right sides of the drawer unit 6 when viewed from the front has one end fixed to the wire 88 and the other end fixed to the support member 6B, and the two elastic members 87 have different elastic characteristics. The tilting member 80 can be tilted from the first position U to the second position, the maximum open position D, while maintaining the balance of the force by the two elastic members 87. Note that the elastic member 87 is a tension coil spring in the embodiment, and prevents the tilting member 80 from descending more than the maximum open position D which is the second position. As shown in FIG. 7, the tilting member 80 normally balances the tension coil spring and the own weight of the tilting member 80 at the position b. May balance at a location near the.
[0087]
Further, the first restricting portion 80a is formed on the tilting member 80, and the second restricting portion 6a is formed on the supporting member 6B which comes into contact with the first restricting portion 80a.
[0088]
The bearing of the tilting member 80 will be described with reference to FIG. 9A is a top view of a bearing portion of the tilting member, FIG. 9B is a front view of the bearing portion of the tilting member, FIG. 9C is a cross-sectional view taken along the line AA, and FIG. It is B sectional drawing. As shown in FIGS. 7 and 9, the support member 6A and the tilting member 80 are rotatable. The bearing portion 80b of the tilting member 80 bears a shaft 98 formed on the support member 6A. It has an opening 80c in at least two directions substantially orthogonal to the center of the bearing 80b and is molded. With this structure, the axis accuracy of the bearing is improved, the relationship between the support member 6A and the tilting member 80 can be maintained with high accuracy, and the conveyance of the recording paper is ensured. In the embodiment, the shaft is provided on the support member 6A and the bearing portion is provided on the tilting member 80, but may be reversed.
[0089]
Next, an operation of pulling out the drawer unit from the image forming apparatus main body will be described with reference to FIGS. 4, 6, 7, and 8. FIG.
1) The locked state of the locking portion 83 is released by the operation lever 84 (FIG. 4).
2) Here, the operating member 85 (FIG. 6) is pulled in the direction of the arrow 41.
3) The elastic member 99 (FIG. 6) is retracted, and the locking member 86B (86A) is rotated by a spring (not shown) to be disengaged from the locking pin 862 (863).
4) The drawer unit 6 is pulled out and slid by the drawer unit guide member 82 (81) and the guide member 82A (81A) as shown in FIG.
5) In the state of the position a (FIG. 7) slightly opened from the first position U, as shown in FIG. 8B, the roller member 96 is locked by the locking member 95.
6) Here, the operating member 85 (FIG. 7) is pushed down.
7) The engagement between the roller member 96 and the locking member 95 is released.
8) The tilting member 80 is opened in the direction of the maximum opening position D which is the second position while the extension coil spring 87 (FIG. 7) is extended. The tension coil spring 87 normally balances at the position b shown in FIG. 7, but if the tension coil spring 87 is weak, it may come to a position close to the maximum open position D.
9) The tilting member 80 is stopped by a stopper (not shown) at the maximum open position D which is the second position. The re-feeding path 66 (FIG. 1) is opened, and the jammed recording paper can be taken out.
[0090]
Next, the operation of storing the drawer unit in the image forming apparatus main body will be described with reference to FIGS. 4, 6, 7, and 8. FIG.
1) Push the operating member 85 (FIG. 6) in the direction opposite to the arrow 41.
2) The drawer unit is slid by the drawer unit guide member 82 (81) and the guide member 82A (81A) (see FIG. 4).
3) The tilting member 80 is pushed up by the main body guide member 97.
4) At the same time, the tension coil spring 87 contracts.
5) The roller member 96 pushes the locking member 95, and the locking member 95 is deformed and locked.
6) The locking member 86B (86A) is pushed by the elastic member 99 and locked on the locking pin 863 (862).
7) The tilting member 80 is positioned with respect to the support member 6B by the first restricting portion 80a and the second restricting portion 6a.
8) The operation lever 84 is rotated and locked. Thus, the refeeding path 66 (FIG. 1) is formed by the tilting member 80.
[0091]
Next, the operation of the paper jam processing will be described with reference to FIGS. 3, 4, 5, 6, and 7. FIG. The drawer unit 6 is pulled out from the image forming apparatus main body A. The recording paper in the jammed state at the position of the loop forming roller 55 is released by pressing the movable guide member 551 against the urging member 553 with the release handle 554 to release the press-contact state of the loop forming roller 55, thereby simplifying the recording paper. Can be removed. When the release handle 554 is released, the movable guide member 551 is automatically returned to the original position by the urging member 553. Further, the recording paper in a jam state between the registration roller 56 and the conveyance roller 39 can be easily removed by opening the movable guide member 561 together with the light source L (L1) with the handle 563 and releasing the pressure contact state of the conveyance roller 39. .
[0092]
When a jam occurs in the re-feeding path 66, the drawer unit 6 is pulled out from the image forming apparatus main body A as shown in FIGS. The tilting member 80 is released. The transport rollers 701, 711, 721, 731, 741, 751 provided on the tilting member 80 are separated from the transport rollers 70, 71, 72, 73, 74, 75, and all the recording paper transport paths below can be opened. Thus, the recording paper in the jam state can be removed.
[0093]
(Embodiment 2)
An image forming apparatus according to a second embodiment of the present invention will be described.
[0094]
In this image forming apparatus, a tension coil spring is replaced with a string-shaped member in the first embodiment. In the second embodiment, the mechanical structure is the same as that of the first embodiment except for the string-shaped member. explain. FIG. 10 is a right side view showing a part of another configuration in a state where the drawer unit is pulled out.
[0095]
As shown in FIG. 10, the support members 6A and 6B are formed in a drawer unit. The tilting member 80 is pivotally supported by the support member 6A, and can tilt to a first position U raised with respect to the support members 6A and 6B and a maximum open position D which is a second position lowered.
The string-like member 94 that does not contract has one end fixed to the tilting member 80 and the other end fixed to the support member 6B. In the embodiment, the string-shaped member is an ester band, but the same applies to a leather belt or a similar member. When the drawer unit is pulled out from the image forming apparatus main body A, as shown in FIG. 10, the tilting member 80 is located at the position a, and the tilting member 80 is lowered by pushing down the operating member 85, so that the string-like member is formed. The position is held at the maximum open position D by 94.
[0096]
【The invention's effect】
The configuration described above has the following effects.
[0097]
According to the first aspect of the invention, when the drawer unit is stored in the image forming apparatus main body, the tilting member is pressed by the image forming apparatus main body, and the tilting member moves from the second position to the first position, The locking member is pressed by the image forming apparatus main body to lock the locking pin, and when the drawer unit is pulled out from the image forming apparatus main body, the locking member is released from the pressing and the locking member is locked by the locking pin. Further, since the tilting member can be moved from the first position to the second position, a part of the recording paper conveyance path can be opened by a simple operation of storing the drawer unit in the main body of the image forming apparatus. In addition, the jam can be easily removed, and the conveyance section of the recording paper is stabilized.
[0098]
According to the third aspect of the present invention, when the tilting member is at the first position, the roller member is locked to the locking member. Therefore, when pulling out the drawer unit, the tilting member is located near the first position. It can be held, and when there is another drawer unit below, interference with the tilting member can be prevented.
[0099]
According to the fourth aspect of the invention, when the drawer unit is stored in the image forming apparatus main body, the rotating roller member is pressed by the image forming apparatus main body, and the tilting member moves from the second position to the first position. When the drawer unit is pulled out from the image forming apparatus main body, the roller member formed on the tilting member is opened from the image forming apparatus main body, and the tilting member is movable from the first position to the second position. The rotation allows the tilting member to move smoothly.
[0100]
According to the invention as set forth in claim 6, one end is fixed to the tilting member, and the other end is fixed to the support member to provide at least two elastic members having different elastic characteristics, and the tilting member maintains the balance by the elastic member. Since the tilting member can be tilted, the tilting member is smoothly tilted even if the tilting member is offset in weight, and the jam of the recording paper is smoothed.
[0101]
According to the invention as set forth in claim 8, one end is fixed to the tilting member and the other end is fixed to the support member to provide a string member that does not shrink, and when the unit is pulled out from the image forming apparatus main body, the string member is used. As a result, the tilting member can be held at the second position, so that the tilting member can be positioned at the second position with a simple mechanism, and the jam of the recording paper is simplified.
[0102]
According to the tenth aspect of the present invention, when the tilting member capable of tilting between the first position raised with respect to the support member and the second position lowered with respect to the support member is at the first position, a predetermined distance from the support member is provided. Since the positioning is performed by the regulating portion capable of holding the recording paper, the tilting member can be reliably positioned by a simple structure, and the recording paper can be reliably transported.
[0103]
According to the eleventh aspect of the present invention, since the rotary bearing of the support member and the tilting member has openings in at least two directions substantially perpendicular to the center and is formed and processed, the shaft center accuracy of the bearing is reduced. As a result, the relationship between the supporting member and the tilting member can be maintained with high accuracy, and the conveyance of the recording paper can be ensured.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a configuration of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is a front cross-sectional view showing a part of a configuration of a conveyance path in a recording sheet.
FIG. 3 is a front sectional view showing a configuration of a drawer unit.
FIG. 4 is a plan view showing a configuration of a drawer unit.
FIG. 5 is an enlarged front sectional view of a part of the configuration of the drawer unit.
FIG. 6 is a right side view showing a part of the configuration of the drawer unit in a housed state.
FIG. 7 is a right side view showing a part of the configuration of the drawer unit in a drawn state.
FIG. 8 is a right side view showing a part of the configuration of the drawer unit in a housed state and a drawn state.
FIG. 9 is a bottom view and a rear view showing a configuration of a bearing portion of the tilting member.
FIG. 10 is a right side view showing a part of another configuration in a state where the drawer unit is pulled out.
FIG. 11 is a right side view showing a part of the configuration of the conventional drawer unit in a housed and drawn state.
[Explanation of symbols]
6 drawer unit
6A, 6B Support member
80 tilting member
80a First regulation unit
85 Operation members
86A, 86B Locking member
862, 863 Locking pin
94 String member
95 Locking member
96 roller members
80b bearing
A main body of image forming apparatus

Claims (16)

An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member having a locking pin formed on the drawer unit,
A tilting member pivotally supported by the support member and tiltable to a first position raised with respect to the support member and a second position lowered with respect to the support member;
A locking member pivotally supported by the tilting member and locked to the locking pin,
When the drawer unit is stored in the image forming apparatus main body, the tilting member is pressed by the image forming apparatus main body and moves from the second position to the first position, and the locking member further moves the image forming apparatus. When the drawer unit is pulled out of the image forming apparatus main body by being pressed by the forming apparatus main body and locked by the locking pin, the locking member is released from the image forming apparatus main body and the locking member is released. An image forming apparatus, wherein the tilting member is disengaged from a locking pin, and the tilting member is movable from the first position to the second position. An elastic member acting on the locking member is provided in the image forming apparatus main body,
The image forming apparatus according to claim 1, wherein the locking member is pressed or released by the image forming apparatus main body via the elastic member. An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member having a locking member formed on the drawer unit,
A tilting member pivotally supported by the support member and capable of tilting to a first position raised with respect to the support member and a second position of maximum openness lowered with respect to the support member;
A roller member pivotally supported by the tilting member and acting on the locking member,
When the tilting member is moved from the second position to the first position, the roller member is locked to the locking member near the first position,
The image forming apparatus, wherein the roller member is disengaged from the locking of the locking member at a position where the tilting member is lowered from the vicinity of the first position. An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member formed on the drawer unit,
A tilting member pivotally supported by the support member and tiltable to a first position raised with respect to the support member and a second position lowered with respect to the support member;
A roller member pivotally supported by the tilting member,
When the drawer unit is stored in the image forming apparatus main body, the roller member is pressed by the image forming apparatus main body, and the tilting member moves from the second position to the first position,
When the drawer unit is pulled out of the image forming apparatus main body, the roller member is released from being pressed by the image forming apparatus main body, and the tilting member is movable from the first position to the second position. Image forming apparatus. The image forming apparatus according to claim 4, wherein the roller member is supported by the tilting member, and is used together with a roller member acting on a locking member formed on the drawer unit. An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member formed on the drawer unit,
A tilting member pivotally supported by the support member and tiltable to a first position raised with respect to the support member and a second position lowered with respect to the support member;
At least two elastic members having different elastic characteristics with one end fixed to the tilting member and the other end fixed to the support member,
An image forming apparatus, wherein the tilting member is tiltable between the first position and the second position while maintaining a balance of force by at least two elastic members. The image forming apparatus according to claim 6, wherein the elastic member is a tension coil spring. An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member formed on the drawer unit,
A tilting member pivotally supported by the support member and tiltable to a first position raised with respect to the support member and a second position lowered with respect to the support member;
A string-shaped member having one end fixed to the tilting member and the other end fixed to the support member and not contracted,
The image forming apparatus, wherein when the drawer unit is pulled out from the image forming apparatus main body, the tilting member is positioned and held at the second position, which is the maximum open position, by the cord member. The image forming apparatus according to claim 8, wherein the string-shaped member is a tough, shape-memory, low-elongation ester band, a leather belt, or a member similar thereto. An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member formed on the drawer unit,
A first member that is pivotally supported by the support member and includes a tilting member that can be tilted to a first position that is raised with respect to the support member and a second position that is lowered with respect to the support member;
The image forming apparatus according to claim 1, wherein when the tilting member is at the first position, the tilting member is positioned by a regulating portion capable of holding a predetermined distance with respect to the support member. An image forming apparatus main body;
A drawer unit that forms a transport path of at least a part of the recording paper that can be pulled out and stored in the image forming apparatus main body,
A support member formed on the drawer unit,
A first member that is pivotally supported by the support member and includes a tilting member that can be tilted to a first position that is raised with respect to the support member and a second position that is lowered with respect to the support member;
A bearing is provided on one of the support member and the tilting member,
The image forming apparatus, wherein the bearing has openings in at least two directions substantially orthogonal to a center line in a thrust direction, and is formed by molding. The image forming apparatus according to claim 1, wherein the drawer unit is disposed below a photosensitive drum disposed in the image forming apparatus. 13. The image forming apparatus according to claim 1, wherein the drawer unit includes a transport roller for re-feeding the transfer paper. 14. The transporting roller according to claim 13, wherein the transporting roller is a pair of transporting rollers, and the supporting member is formed with one of the transporting rollers, and the tilting member is formed with the other of the transporting rollers. Image forming device. The first position of the tilting member is a position close to the support member,
The second position of the tilting member is a position inclined downward by a predetermined amount with respect to the support member, and includes a maximum open position of the tilting member. An image forming apparatus according to claim 1. The positioning device according to claim 1, wherein the tilting member is positioned at the first position by a restricting portion capable of holding a predetermined distance with respect to the support member. 17. 5. The image forming apparatus according to claim 1.

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