JP4181683B2 - Sheet conveying apparatus and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet conveying apparatus for conveying a sheet, and is applied to an image forming apparatus such as a printer, a copying machine, and a facsimile.
[0002]
[Prior art]
Conventionally, this type of sheet conveying apparatus is applied to image forming apparatuses such as printers, copiers, and facsimiles.
[0003]
Hereinafter, as an example, a case where the present invention is applied to a laser beam printer will be described with reference to FIG.
[0004]
FIG. 2 is a schematic configuration diagram of an image forming apparatus (laser beam printer) according to the prior art, and shows an overall schematic configuration of a conventional laser beam printer.
[0005]
A sheet feeding cassette K in which a large number of sheet materials S are stacked and stored is detachably attached to the bottom of the printer main body M.
[0006]
In the figure, reference numeral 1 is a paper feed roller, reference numeral 2 is a conveying roller that is in pressure contact with the rollers 2a and 2b, reference numeral 3 is a registration roller pair, reference numeral 4 is a photosensitive drum, reference numeral 5 is a transfer roller, reference numeral 6 is a fixing roller pair, Reference numeral 7 denotes a pair of conveying rollers, reference numeral 8 denotes a conveying roller (hereinafter referred to as a reversing roller) that can be rotated in the forward and reverse directions in the vertical conveying path, and reference numeral 8 a denotes a driven roller that is in pressure contact with the reversing roller 8 held by the swing guide 21. Roller, reference numeral 9 is a half-moon-shaped transport roller, reference numeral 9a is a driven roller pressed against the half-moon-shaped roller 9, reference numeral 10 is a pair of transport rollers having a curl removing function (hereinafter referred to as a decurling roller), and reference numeral 11 is a transport Reference numeral 12 denotes a scanner, reference numeral 13 denotes a folding mirror, reference numeral 14 denotes a paper discharge tray, reference numeral 15 denotes a flapper for switching the sheet conveyance direction, and reference numeral 16 denotes a sheet discharge roller. .
[0007]
The light beam scanned by the scanner 12 is guided to the photosensitive drum 4 through the mirror 13.
[0008]
Next, the printing operation will be described.
[0009]
In FIG. 2, the sheet material S fed from the paper feed cassette K by the paper feed roller 1 is guided to the nip between the transport roller 2 and the roller 2 b and further transported to the registration roller pair 3.
[0010]
Then, the resist roller pair 3 conveys the photosensitive drum 4 at the same timing, and an image (unfixed image) on the photosensitive drum 4 is transferred by a known process (image forming means).
[0011]
Thereafter, the sheet material S is sent to a fixing roller pair 6 as fixing means, where an image is fixed, and then guided to a flapper 15 by a conveying roller pair 7.
[0012]
Here, when printing on both sides of the sheet material S, the sheet material S that has finished printing on the first surface proceeds in the direction of the arrow (shown by C in the figure) by the flapper 15 in the posture shown by the broken line, and is reversed. Guided to the roller pair 8, 8a.
[0013]
FIG. 3 is a detailed view showing how the sheet material S is conveyed in the vicinity of a pair of reversing rollers (a pair of rotating bodies) 8 and 8a.
[0014]
As shown in FIG. 3, the sheet material S conveyed from the C direction reaches the leading edge of the known sheet material detection means 17, and when the sheet material detection means 17 detects the leading edge of the sheet material S, The pair of reversing rollers 8 and 8a rotate in the direction of the solid line arrow and convey until the rear end of the sheet material S is detected by the sheet material detection means 17.
[0015]
That is, the sheet material S conveyed by the pair of reverse rollers 8 and 8a is guided to the vertical conveyance path 33 shown in FIG. 2 and conveyed until the rear end of the sheet material S is detected by the sheet material detection means 17. .
[0016]
Then, after detecting the rear end of the sheet material S and conveying a certain amount until the rear end of the sheet material S passes through the branch point 18, the reverse roller pair 8, 8 a is reversely rotated in the direction of the broken arrow.
[0017]
Here, since the nip direction of the reversing roller 8 is in a new direction indicated by the arrow D, the rear end of the sheet material passes through the branch point 18, and when the reversal starts, the front end of the sheet material S (the rear end before the reversal) ) Is conveyed in the D direction.
[0018]
FIG. 4 shows a state where the roller 8 a is in pressure contact with the reversing roller 8.
[0019]
The swing guide (swing guide member) 21 is configured to be swingable about a shaft 21a.
[0020]
The roller 8a held by the swing guide 21 is pressed against the reversing roller 8 with the shaft 21a as the swing center by a spring 22 as an urging means.
[0021]
Here, as described above, the sheet that is reversed by the reversing roller 8 and conveyed in the D direction is guided between the guide 19 and the guide 20 to the half-moon shaped roller 9.
[0022]
The half-moon shaped roller 9 is normally stopped with the D-cut portion facing down by position detecting means (not shown) for detecting the position in the rotational direction.
[0023]
The half-moon shaped roller 9 makes one rotation at the timing when the sheet S approaches, presses against the driven roller 9a, conveys the sheet S, and stops again with the D-cut portion down.
[0024]
FIG. 5 is a top view showing the conveyance path in the vicinity of the half-moon shaped roller 9.
[0025]
As shown in FIG. 5, guide plates 19a and 19b serving as restricting means sandwich the sheet from the width direction and control the position in the width direction of the sheet (hereinafter referred to as a lateral resist).
[0026]
Hereinafter, the guide plate 19 (19a, 19b) is referred to as a horizontal register plate.
[0027]
Here, a detection signal from the sheet material detection means 17 is input to a CPU (not shown) as an operation control means, and the CPU determines the half-moon shaped roller based on these detection signals. 9. Control the horizontal register plates 19a and 19b.
[0028]
When the sheet material S is reversed by the reversing roller 8 and enters the lateral registration plates 19a and 19b, the lateral registration plates 19a and 19b are at positions wider than the width of the sheet material S. Thereafter, the lateral registration plates 19a and 19b 19b moves to a reference position that varies depending on the sheet material size in the direction of the arrow perpendicular to the sheet material conveyance direction, and adjusts the lateral registration of the sheet material S in the lateral registration plates 19a and 19b.
[0029]
Here, after the half-moon shaped roller 9 described above stops with the D-cut portion facing down, the lateral registration is adjusted by the lateral registration plates 19a and 19b described above.
[0030]
That is, since the half-moon shaped roller 9 has the D-cut portion on the bottom, the half-moon shaped roller 9 is stopped in a state where there is no gap in contact with the roller 9a, and the sheet S is not sandwiched.
[0031]
Further, as shown in FIG. 6, the upstream reversing roller pair 8 and 8a also releases the nip of the reversing roller pair 8 and 8a, thereby adjusting the lateral registration with the sheet S completely free.
[0032]
In many cases, the lateral registration is adjusted after a free state in which the sheet material is not sandwiched.
[0033]
FIG. 7 is a detailed view for explaining the pressure release mechanism (nip release mechanism) of the swing guide 21 that swings about the shaft 21a.
[0034]
In FIG. 7, 23 is a known suction solenoid, and 24 is an actuator that rotates about a shaft 24a (the suction solenoid 23 and the actuator 24 are main members constituting a nip releasing mechanism).
[0035]
When the solenoid 23 is pulled in the direction of the arrow E, the actuator 24 rotates in the direction F in the direction 24b and pushes the projection 21b of the swing guide 21, thereby swinging the swing guide 21 about the shaft 21a.
[0036]
In this way, the nip release of the roller 8a as shown in FIG. 6 is performed.
[0037]
Returning to FIG. 3, when supplementary explanation is given, after the half-moon shaped roller 9 stops with the D-cut portion facing down, the nip of the reversing roller pair 8 and 8a is released to make it completely free, and then the above-mentioned horizontal registration plate 19a. , 19b to adjust the lateral register.
[0038]
After the lateral registration adjustment is completed, the reversing roller pair 8, 8 a releases the solenoid 23 and is pressed again by the spring 22.
[0039]
Then, the half-moon shaped rollers 9, 9a and the reverse rollers 8, 8a rotate.
[0040]
Returning to FIG. 2, when the description is continued, the lateral registration adjustment is completed, and the sheet conveyed by the reversing roller pair 8, 8a and the half-moon shaped roller pair 9, 9a is the curl removing roller pair 10, and the conveying rollers 2, 2a. Then, the sheet material S, which is guided to the nip of the rollers 2 and 2 b and has the second surface as the front, is sent to the registration roller pair 3.
[0041]
The sheet material S sent to the registration roller pair 3 is printed on the second surface in the same manner as in the case of the first surface described above.
[0042]
The sheet material S after printing on the second surface is discharged onto the tray 14 by the discharge roller pair 16 by the flapper 15 in the posture shown by the solid line in the drawing.
[0043]
[Problems to be solved by the invention]
However, in the case of the prior art as described above, there are the following drawbacks because there is a pair of reversing rollers in the vertical conveyance path and a pressure release mechanism is provided.
[0044]
1) Since there is a possibility that the sheet slips and falls down during reversal, it is necessary to set the roller pressure contact force to the reversing roller 8 strongly.
[0045]
Therefore, it is necessary to increase the urging force (spring pressure) by the spring 22, and accordingly, it is difficult to apply the spring to the spring hooking portion, which is a heavy burden on the assembling worker.
[0046]
In addition, the spring 22 is pulled by a strong force during assembly, and the spring 22 may be accidentally bent.
[0047]
2) Since the pressure is pressed against the reversing roller 8 with a strong force, when the pressure is released by swinging the swing guide 21, the suction solenoid 23 requires a large force. Had an effect on the size of
[0048]
The present invention has been made to solve the above-mentioned problems of the prior art, and the object is to have excellent assembly workability, prevent the apparatus from becoming large, and have reliability that prevents overheating. An object is to provide an excellent sheet conveying apparatus and image forming apparatus.
[0049]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a transport path is provided as a swing guide member that includes a transport path formed by a plurality of guide members and pivotally supports at least one of the guide members. In the sheet conveying apparatus configured to be openable inside, the swing guide member is provided with an airflow generating means for generating an airflow between the inside and the outside of the conveying path, and is directed from the inside of the conveying path to the outside by the airflow generating means. Generating an air flow to dissipate heat inside the conveyance path, and applying a swinging force toward the inside of the transport path to the swing guide member that supports the air flow generation means by the reaction force of the air flow And
[0050]
Therefore, by generating the air flow by the air flow generating means, it is possible to radiate the heat in the conveyance path or to send the cold air of the outside air into the conveyance path, and at the same time, the reaction force by generating the air flow, A swinging force can be applied to the swing guide member provided with the airflow generation means.
[0051]
A conveying path formed by a plurality of guide members;
A pair of rotating bodies that convey the inside of the conveyance path while sandwiching the sheet;
A regulating means for regulating the position in the width direction of the conveyed sheet;
Operation control means for controlling the operation of the restriction means,
As a swing guide member that pivotally supports at least one of the guide members so as to be swingable, a sheet transport apparatus configured to be able to open the transport path,
The swing guide member is provided with an airflow generating means for supporting one of the pair of rotating bodies and generating an airflow between the inside and the outside of the conveyance path.
[0052]
Therefore, by generating the air flow by the air flow generating means, it is possible to radiate the heat in the conveyance path or to send the cold air of the outside air into the conveyance path, and at the same time, the reaction force by generating the air flow, A swinging force can be applied to the swing guide member provided with the airflow generation means.
[0053]
Biasing means for biasing the swing guide member toward the inside of the transport path;
When the operation control means performs the restriction by the restriction means, the rocking guide member is swung toward the outside of the conveying path against the biasing force by the biasing means, so that the nip between the pair of rotating bodies is formed. And a nip releasing mechanism for releasing.
[0054]
When the nip is released by the nip release mechanism, it is preferable that no airflow is generated by the airflow generation unit.
[0055]
When releasing the nip by the nip releasing mechanism, it is also preferable to generate an air flow from the outside of the conveyance path to the inside by the air flow generating means.
[0056]
The air flow generating means generates an air flow from the inside of the transport path to the outside to dissipate the heat in the transport path, and transports the swing guide member that is supported by the reaction force of the air flow. A swinging force may be applied toward the inside of the road.
[0057]
When the swing guide member is swung to open the inside of the conveyance path, the air flow generation means may be stopped.
[0058]
Image forming means for forming an unfixed image on a sheet to be conveyed;
Fixing means for heating and fixing an unfixed image formed by the image forming means;
An image forming apparatus comprising: a double-sided conveyance path that reverses the sheet and conveys the sheet toward the image forming unit again in order to form an image on the other side after the image is fixed on one side of the sheet. In the device
At least one of the plurality of guide members forming the double-sided conveyance path is a swing guide member provided in the sheet conveyance device.
[0059]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0060]
(First embodiment)
Hereinafter, the sheet conveying apparatus and the image forming apparatus according to the first embodiment will be described.
[0061]
For the sake of simplicity of explanation, in the above-described prior art, the same components as those described with reference to the drawings are denoted by the same reference numerals, and detailed description thereof is omitted and illustrated. In the case where the configuration is the same as the configuration according to this embodiment as it is, description will be made by applying the same drawing.
[0062]
FIG. 1 is a schematic configuration diagram of an image forming apparatus according to a first embodiment of the present invention, and shows an overall configuration of a laser beam printer as an example of the image forming apparatus.
[0063]
In FIG. 1, reference numeral 25 denotes a blower fan provided on the swing guide 21 of the duplex conveying unit.
[0064]
FIG. 8 shows a front view of the fan 25 provided in the swing guide 21, and FIG. 9 shows a state of wiring for sending electricity to the fan 25.
[0065]
As shown in the drawing, since the wiring 27 passes through the guide fulcrum, it does not hinder the guide from swinging.
[0066]
First, the printing operation of the laser beam printer will be described with reference to FIG.
[0067]
Here, a case where printing is performed on one side of a sheet and a case where printing is performed on both sides will be described separately.
[0068]
(1) When printing on one side of a sheet.
[0069]
In FIG. 1, when a CPU (not shown) provided in the main body receives a signal for performing single-sided printing, the sheet material S accommodated in the cassette K is fed by the paper feed roller 1 and is known as in the prior art. After the toner is transferred to one side of the sheet by the photosensitive drum 4 and the transfer roller by the above process, the toner is pressed and heated and fixed by the fixing roller pair 6.
[0070]
The sheet fixed by pressurization and heating is guided to the flapper 15 in the solid line posture, and is further discharged onto the tray 14 by the discharge roller 16 through the conveying roller 11.
[0071]
In this way, printing on one side is completed.
[0072]
When printing on one side, the sheet heated by fixing is discharged onto the tray 14 via the flapper 15, the transport roller 11, and the discharge roller 16, so that the vicinity of the drum is not heated by the heated sheet.
[0073]
(2) When automatically printing on both sides of the sheet.
[0074]
The description will be made with reference to FIG. 1 as in the case of single-sided printing.
[0075]
In FIG. 1, when a CPU (not shown) of the main body receives signals to be printed on both sides, the fan 25 as an air flow generating means rotates, and the air inside the duplex unit (inside the conveyance path) is moved in the direction of arrow G (outside the conveyance path). To blow.
[0076]
Here, since the louver 26 is provided in the exterior, the air sent out in the G direction is discharged to the outside through the louver 26.
[0077]
In FIG. 1, the sheet material S accommodated in the cassette K is fed by the sheet feeding roller 1, and the first surface is printed on the sheet material S1 through the photosensitive drum 4 and the fixing roller pair 6 as in the prior art. .
[0078]
Then, in order to perform printing on the second side, it is conveyed in the C direction by the flapper 15 and guided to the pair of reverse rollers 8 and 8a.
[0079]
FIG. 10 is a detailed view showing a state in which the sheet material S is conveyed in the vicinity of the pair of reverse rollers 8 and 8a.
[0080]
In FIG. 10, since the fan 25 blows air in the G direction, the swing guide 21 is pushed in the opposite direction (inner side of the conveyance path) as the reaction force.
[0081]
For this reason, the roller 8 a provided in the swing guide 21 is pressed against the reversing roller 8 by the reaction force.
[0082]
Therefore, since the pressing force increases, the force of the spring 22 applied to the swing guide 21 can be set weak.
[0083]
The leading edge of the sheet material S conveyed from the C direction reaches the sheet material detecting means 17.
[0084]
Here, when the sheet material detection means 17 detects the leading edge of the sheet material S, the pair of reversing rollers 8 and 8a rotate in the direction of the solid line arrow and are conveyed until the rear end of the sheet material S is detected by the sheet material detection means 17. The
[0085]
Then, after detecting the rear end of the sheet material S and conveying a certain amount until the rear end of the sheet material S passes through the branch point 18, the reverse roller pair 8, 8 a is reversely rotated in the direction of the broken arrow.
[0086]
Here, since the nip direction of the reversing roller 8 is in a new direction indicated by the arrow D, the rear end of the sheet material passes through the branch point 18, and when the reversal starts, the front end of the sheet material S (the rear end before the reversal) ) Is conveyed in the D direction.
[0087]
Then, the pair of reversing rollers 8 and 8 a are reversed, and the sheet material S conveyed in the direction of the arrow D is guided between the lateral registration plate 19 and the guide 20 to the half-moon shaped roller 9.
[0088]
At this time, the half-moon shaped roller 9 is normally stopped with the D-cut portion facing down.
[0089]
The half-moon shaped roller 9 receives a signal from the CPU, rotates once or twice when the sheet S approaches, conveys the sheet S in pressure contact with the driven roller 9a, and the leading end of the decurling roller 10 Before reaching the nip, stop again with the D-cut part down.
[0090]
From this state, the lateral registration plates 19a and 19b adjust the lateral registration by sandwiching the sheet material S from the width direction of the sheet material S in the same manner as in the prior art.
[0091]
Here, after the half-moon shaped roller 9 is stopped with the D-cut portion facing down, the lateral registration is adjusted by the lateral registration plates 19a and 19b described above, so that the sheet S is not pinched and the reversing roller is further removed. The pair 8 and 8a also release the pressure in the same manner as the prior art to make the sheet material S free.
[0092]
At this time, the fan 25 is stopped and the pressing force against the reversing roller 8 is not generated by the reaction force described above.
[0093]
When the lateral registration adjustment is completed, the fan 25 rotates again and a pressing force is generated.
[0094]
Then, the sheet material S is again led to the nip of the half-moon shaped rollers 8 and 8a, the curl removing roller pair 10 and the conveying rollers 2 and 2a which are strongly pressed against each other, and further to the nip of the rollers 2 and 2b. The sheet material S with the two faces up is sent to the registration roller pair 3.
[0095]
The sheet material S sent to the registration roller pair 3 is printed on the second surface in the same manner as in the case of the first surface described above.
[0096]
The sheet material S after printing on the second surface is discharged onto the tray 14 by the discharge roller pair 16 by the flapper 15 in the posture shown by the solid line in the drawing.
[0097]
By configuring as described above, the following effects can be obtained.
[0098]
(1) Since the fan 25 is provided on the swing guide 21 of the double-sided transport unit, and the fan 25 can be rotated during double-sided printing to obtain the pressure contact force of the pair of reverse rollers, the spring 22 is set weakly. Can do.
[0099]
For this reason, it can assemble smoothly at the time of an assembly, and assembly workability improves.
[0100]
(2) When the pressure is released, the fan 25 is stopped and only the spring force becomes pressure, so that the pressure contact force of the reverse roller pair becomes smaller and the suction force of the suction solenoid 23 can be made smaller than in the prior art. Accordingly, the size of the solenoid 23 itself can be reduced.
[0101]
As a result, the cost of the solenoid 23 can be reduced, and the image forming apparatus main body M can be made smaller.
[0102]
(3) Since the swing guide 21 of the duplex conveying unit is provided with the fan 25, in the automatic duplex mode in which the sheet heated by the fixing roller pair 6 is conveyed through the duplex conveying unit and guided again to the transfer unit. The heated sheet is cooled (heat radiation effect) by discharging the air inside the conveyance unit (inside the conveyance path), and the sheet heated by this is not conveyed again to the transfer unit.
[0103]
As a result, problems such as a phenomenon (hereinafter referred to as toner blocking) in which the toner is solidified by a temperature rise in the apparatus before fixing are not caused.
[0104]
In particular, an image forming apparatus with a high throughput is particularly effective because heated sheets are successively conveyed to the transfer unit.
[0105]
(Second Embodiment)
When the fan 25 shown in the first embodiment is configured to reversely rotate when releasing the pressure, the air flows backward to generate an airflow from the outside of the conveyance path to the inside. A force is applied in the direction of releasing pressure as a reaction force.
[0106]
Thereby, the suction force of the solenoid can be further reduced.
[0107]
In addition, since the outside air cooled from the louver provided in the exterior is blown to the heated sheet at this time, there is an effect of reducing the temperature of the sheet in the same manner as described above.
[0108]
(Third embodiment)
[0109]
FIG. 11 shows a third embodiment of the present invention.
[0110]
In FIG. 11, reference numeral 28 denotes a blower fan.
[0111]
The fan 28 is provided on a swinging guide member 29.
[0112]
FIG. 12 is a detailed view of the fan provided on the guide member 29.
[0113]
As shown in FIG. 12, the guide member 29 can be opened around the shaft 9b of the half-moon shaped roller 9, and the remaining sheet can be removed.
[0114]
In addition, about the same structure as the above-mentioned structure, the same code | symbol is attached | subjected and demonstrated.
[0115]
As shown in FIG. 11, when a CPU (not shown) provided in the main body receives a signal for performing double-sided printing, the fan 25 rotates and is controlled to rotate as in the case of the first embodiment described above. (When the pressure is released, the fan stops.)
[0116]
The fan 28 also rotates and blows air in both sides in the H direction.
[0117]
In this manner, the air in the duplex conveyance unit (inside the conveyance path) is blown again toward the fixing roller pair 6 side.
[0118]
When the fan 28 blows in the H direction, the guide 29 is applied with a force pressed from above.
[0119]
The printing operation is the same as in the case of the first embodiment described above.
[0120]
When the sheet remains in the duplex unit due to a jam or the like, the fans 25 and 28 are stopped.
[0121]
With the configuration described above, the following effects can be obtained.
[0122]
(1) Since the fan 28 is provided in the swing guide 29 of the duplex conveying unit, and the swing guide 29 is pressed by rotating the fan 28 during duplex printing, the hard sheet swings as shown in FIG. Even if the sheet is conveyed to the guide 29, the guide is not lifted by the waist of the sheet and can be smoothly conveyed.
[0123]
(2) When the sheet remains in the duplex unit due to a jam or the like, the fan 28 stops, so that no pressing force is generated, and the user can lightly open the swing guide 29 and easily remove the remaining sheet. be able to.
[0124]
(3) Since the fan 28 is provided in the swing guide 29 of the duplex conveying unit, in the automatic duplex mode in which the sheet heated by the fixing roller pair 6 is conveyed through the duplex conveying unit and guided again to the transfer unit. By blowing the heated air in the transport unit to the fixing roller pair 6 side, the fixing roller 6 is warmed and can be fixed efficiently.
[0125]
Further, the heated sheet in the duplex unit is cooled (heat radiation effect), and the sheet heated by this is not conveyed again to the transfer unit.
[0126]
As a result, there is no occurrence of toner blocking in which the toner is hardened by the temperature rise in the apparatus before fixing.
[0127]
In particular, an image forming apparatus with a high throughput is particularly effective because heated sheets are successively conveyed to the transfer unit.
[0128]
【The invention's effect】
As described above, according to the present invention, the air flow is generated by the air flow generating means to radiate the heat in the conveyance path, or the outside air is sent into the conveyance path to prevent overheating, and at the same time, With the reaction force generated by generating oscillating force, the oscillating force can be applied to the oscillating guide member provided with the airflow generating means, and the force by the spring or solenoid etc. for oscillating the oscillating guide member is reduced Therefore, the assembling workability of the apparatus can be improved, the apparatus can be miniaturized, and the reliability is improved.
[0129]
If one of the pair of rotating bodies is supported on the swing guide member provided with the airflow generation means, the swinging force can be applied in the direction of increasing or decreasing the nip force of the pair of rotating bodies depending on the direction of the airflow. it can.
[0130]
When the nip is released by the nip release mechanism, the airflow can be released with a weak force by not generating the airflow by the airflow generation means.
[0131]
When the nip is released by the nip release mechanism, the airflow can be released with a weaker force by generating an airflow from the outside to the inside of the conveyance path by the airflow generating means.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an image forming apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of an image forming apparatus according to a conventional technique.
FIG. 3 is a detailed view illustrating a state of sheet conveyance of a sheet conveying apparatus according to a conventional technique.
FIG. 4 is a detailed view of a swing guide pressing unit provided in the sheet conveying apparatus.
FIG. 5 is a top view showing a lateral registration portion in the sheet conveying apparatus.
FIG. 6 is a detailed view illustrating a state when pressure is released to a sheet of a sheet conveying device according to the related art.
FIG. 7 is a detail view illustrating a pressure releasing mechanism for a sheet of the sheet conveying apparatus.
FIG. 8 is a schematic configuration diagram of a swing guide provided with a fan provided in the sheet conveying apparatus according to the embodiment of the present invention.
FIG. 9 is a detailed view showing a state of electrical wiring to a fan provided in the sheet conveying apparatus according to the embodiment of the present invention.
FIG. 10 is a detailed view showing a state of sheet conveyance of the sheet conveyance apparatus according to the first embodiment of the present invention.
FIG. 11 is a schematic configuration diagram of an image forming apparatus according to a third embodiment of the present invention.
FIG. 12 is a schematic configuration diagram of a main part of a sheet conveying apparatus according to a third embodiment of the present invention.
FIG. 13 is a schematic configuration diagram of a main part of a sheet conveying apparatus according to a third embodiment of the present invention.
[Explanation of symbols]
4 Photosensitive drum 5 Transfer roller 6 Fixing roller 8 Reversing roller 8a Roller 9 Half-moon shaped roller 9b Roller 10 Conveying roller pair 17 Sheet material detection means 19 Horizontal resist plate 21 Swing guide 21a Shaft 22 Spring 23 Suction solenoid 25 Fan 26 Louver 28 Fan 29 Swing guide S Sheet material

Claims (9)

A conveyance path formed by a plurality of guide members;
As a swing guide member that pivotally supports at least one of the guide members so as to be swingable, a sheet transport apparatus configured to be able to open the transport path,
The swing guide member is provided with an airflow generating means for generating an airflow between the inside and outside of the conveying path, and the airflow generating means generates an airflow from the inside of the conveying path to the outside to dissipate the inside of the conveying path. A sheet conveying apparatus that applies a swinging force toward the inside of the transporting path with respect to the swinging guide member that supports the airflow generating means by the reaction force of the airflow . A conveyance path formed by a plurality of guide members;
A pair of rotating bodies that convey the inside of the conveyance path while sandwiching the sheet;
A swing guide comprising a restricting means for restricting the position of the conveyed sheet in the width direction and an operation control means for controlling the operation of the restricting means, wherein at least one of the guide members is pivotally supported. As a member, in a sheet conveying apparatus configured to be openable in the conveying path,
A sheet conveying apparatus, wherein the swing guide member is provided with an airflow generating means for supporting one of the pair of rotating bodies and generating an airflow between the inside and the outside of the conveying path. Biasing means for biasing the swing guide member toward the inside of the transport path;
When the operation control means performs the restriction by the restriction means, the rocking guide member is swung toward the outside of the conveying path against the biasing force by the biasing means, so that the nip between the pair of rotating bodies is formed. The sheet conveying apparatus according to claim 2, further comprising a nip releasing mechanism that releases the sheet.   The sheet conveying apparatus according to claim 3, wherein when the nip is released by the nip releasing mechanism, the airflow is not generated by the airflow generating unit.   The sheet conveying apparatus according to claim 3, wherein when the nip is released by the nip releasing mechanism, an air flow is generated from the outside of the conveying path to the inside by the air flow generating unit. The air flow generating means generates an air flow from the inside of the transport path to the outside to dissipate the heat in the transport path, and transports the swing guide member that is supported by the reaction force of the air flow. 6. The sheet conveying apparatus according to claim 2, wherein a swinging force is applied toward the inside of the path. The sheet conveying device according to claim 1 or 6, wherein when the swinging guide member is swung to open the inside of the transport path, the airflow generation unit is stopped. A pair of rotating bodies that convey the inside of the conveyance path while sandwiching a sheet;
  The swing guide member supports one of the pair of rotating bodies,
  The sheet conveying apparatus according to claim 1, wherein a pressure contact force of the pair of rotating bodies is obtained by a reaction force of an airflow generated by the airflow generation unit. Image forming means for forming an unfixed image on a sheet to be conveyed;
Fixing means for heating and fixing an unfixed image formed by the image forming means;
An image forming apparatus comprising: a double-sided conveyance path that reverses the sheet and conveys the sheet toward the image forming unit again in order to form an image on the other side after the image is fixed on one side of the sheet. In the device
9. At least one of a plurality of guide members forming the double-sided conveyance path is a swing guide member provided in the sheet conveyance device according to any one of claims 1 to 8. Image forming apparatus.

Images