JP2020164272A - Sheet discharger and sheet carrier - Google Patents

Abstract

To realize a sheet discharger capable of suppressing the ability to load sheets from worsening.SOLUTION: A sheet discharger includes a hold member (22) that is allowed to swing between a hold state of pressing a loaded sheet (S) by descending due to an own weight and a retracted state of being lifted up by a sheet being discharged and a magnet (23A, 23B) that alleviates the load of the hold member (22) applied to the sheet (S) and allows the hold member (22) to descend by its own weight when a lift-up by the sheet (S) is eliminated.SELECTED DRAWING: Figure 3

Description

The present invention relates to a sheet ejection device and a sheet conveying apparatus that are mounted on an image forming apparatus such as a printer, a facsimile, or a copier and eject and convey paper or the like.

In an image forming apparatus, a swinging member that swings so as to be lowered by its own weight after being pushed up by a sheet to be conveyed is used for various purposes.

For example, in the case of continuously and automatically feeding a plurality of sheets, the sheets that have been image-formed and discharged on the output tray must be loaded in the output tray in the order in which they were output. It doesn't become.

For this purpose, one condition is that the sheets loaded on the output tray are not curled. However, in general, in an image forming apparatus, it is unavoidable that a certain amount of curl is generated on the sheet discharged on the output tray after the image formation is completed.

The amount of curl generated is strongly influenced by the material of the sheet, the image density, the ambient temperature and humidity, the passage of time, etc., and the image forming method is also greatly affected.

If curl occurs on the output tray, the sheet ejected on the output tray later may slip under the sheet already loaded on the output tray and the loading order may be disturbed, or the output tray may be curled later. The sheet ejected on the paper pushes out the sheet already loaded on the output tray, and the alignment is disturbed.

In order to deal with this problem, in the image forming apparatus described in Patent Document 1, as an example of the above-mentioned swinging member, a paper ejection presser that presses the vicinity of the rear end of the sheet newly loaded on the paper ejection tray from above. Have the means. As a result, it is said that curl is less likely to occur near the rear end of the sheet newly loaded on the output tray, and curl generated near the rear end of the sheet is corrected.

Japanese Patent Application Laid-Open No. 7-277581 (published on October 24, 1995)

Members such as the paper output tray and the paper output pressing means will be referred to as "loading unit" and "pressing member", respectively.

As a configuration of the pressing member, a configuration that can swing between a pressing state in which the seat is lowered by its own weight and pressed by the seat loaded on the loading portion and a retracted state in which the seat is pushed up by the seat being discharged from the discharge roller pair is considered. Be done.

In this configuration, the sheet being discharged is loaded on the loading portion while pushing up the pressing member. On the other hand, the pressing member has a certain weight in order to fulfill its function. Therefore, the movement of the discharged sheet may be affected by the action of the pressing member. Specifically, the landing position of the tip of the discharged sheet may be on the front side in comparison with the configuration in which the pressing member is not provided. Then, the discharged sheet tends to push the sheet already loaded on the loading section, which tends to cause deterioration of the loadability. It should be noted that such a problem tends to become more prominent as the stiffness of the sheet becomes weaker.

One aspect of the present invention has been made to solve the above problems, and provides a sheet discharging device capable of suppressing or reducing deterioration of sheet loadability, and a sheet conveying device to which the sheet discharging device is applied. The purpose is to do.

In order to solve the above problems, the sheet discharging device according to one aspect of the present invention is lowered by its own weight with a discharging roller for discharging the sheet, a loading portion on which the sheet discharged by the discharging roller is loaded, and the same. A pressing member that can swing between a pressing state that presses the sheet loaded on the loading portion and a retracted state that is pushed up by the sheet being discharged from the discharging roller, and the pressing member that is applied to the discharging sheet. A magnet is applied to the pressing member so as to reduce the load of the magnet, and the strength of the magnetic force is such that when the pressing by the sheet is canceled, the pressing member is allowed to descend due to its own weight. And.

The pressing member lowers due to its own weight and presses the seat loaded on the loading portion. As a result, it is possible to prevent the sheet loaded on the loading portion from curling.

The pressing member is pushed up by the sheet being discharged from the discharge roller and retracted from the sheet transport path. Further, when the discharge of the sheet is completed once and the pushing up by the sheet is canceled, the pressing member descends due to its own weight and returns to the pressing state.

When the pressing member is in the retracted state, the magnetic force applied to the pressing member by the magnet reduces the load on the pressing member applied to the sheet being discharged. As a result, it is possible to prevent the phenomenon that the landing position of the tip of the sheet discharged by the action of the pressing member is on the front side, that is, the discharge roller side, or even if it occurs, reduce the degree.

As a result, it is possible to suppress or reduce the deterioration of the loadability of the sheet due to the provision of the pressing member.

Further, the present invention can be applied not only to a sheet discharging device but also to a sheet transporting device having a transport roller for transporting sheets. The sheet transfer device according to another aspect of the present invention can swing between a transfer roller that conveys a sheet, a lowering state that is lowered by its own weight, and an ascending state that is pushed up by the sheet being conveyed by the transfer roller. A magnetic force is applied to the swinging member so as to reduce the load on the swinging member and the swinging member applied to the sheet being conveyed, and the strength of the magnetic force is eliminated by pushing up by the seat. It is provided with a magnet that allows the swinging member to descend due to its own weight when the swinging member is used.

In the sheet transfer device, a swing member that can swing between a descending state lowered by its own weight and an ascending state pushed up by the sheet being conveyed by the transfer roller corresponds to the pressing member. Such a swing member is provided, for example, in a path switching portion having a configuration for performing switchback transfer.

Then, when the swinging member is in the ascending state, the load applied to the swinging member on the sheet being conveyed is reduced by the magnetic force applied to the swinging member by the magnet. As a result, it is possible to make it difficult to cause poor transportation of the sheet during transportation and damage to the sheet, or even if it occurs, the degree of damage to the sheet can be reduced.

According to one aspect of the present invention, deterioration of the loadability of the sheet can be suppressed or alleviated. Further, according to another aspect of the present invention, it is possible to make it difficult for poor sheet transfer and damage to the sheet to occur, or to reduce the degree of damage to the sheet.

It is sectional drawing which shows the structure of the laser printer which concerns on one Embodiment of this invention. It is sectional drawing which shows the holding state of the holding member in the sheet discharging device provided in the laser printer of FIG. It is sectional drawing which shows the retracted state of the holding member in the sheet discharging apparatus of FIG. It is sectional drawing which shows the holding state of the holding member in another sheet discharging device provided in the laser printer of FIG. FIG. 5 is a cross-sectional view showing a retracted state of a pressing member in the sheet discharging device of FIG. FIG. 5 is a plan view showing a retracted state of a pressing member in the sheet discharging device of FIG. It is a figure which shows the arrangement of the magnet in the sheet discharge device of FIG. It is a figure which shows the other arrangement of magnets in the sheet discharge device of FIG. It is a figure which shows the other arrangement of magnets in the sheet discharge device of FIG. It is sectional drawing which shows the structure of the inkjet printer which concerns on other embodiment of this invention.

In the present embodiment, the sheet discharging device and the sheet transporting device according to the present invention are applied to a laser printer and an inkjet printer as an image forming device.

1. 1. Application to laser printer 1.1. Outline of Laser Printer As shown in FIG. 1, in the laser printer 1, an image forming portion 11 is housed in a box-shaped housing 10, and the image forming portion 11 forms a sheet such as paper or an OHP sheet. An image is formed in S.

The image forming unit 11 is composed of four process cartridges 12K, 12Y, 12M, 12C, an exposure device 13, a fixing device 14, and the like corresponding to four color developers of black, yellow, magenta, and cyan, respectively. The image forming unit 11 is a direct tandem system that forms a color image on the sheet S by superimposing the developer images for four colors formed by the process cartridges 12K, 12Y, 12M, and 12C on the sheet S. is there.

The sheet S is placed on the paper feed tray 15, separated and picked up one by one by a feeder portion including a pickup roller 15A, a separation roller 15B, a separation pad 15C, and the like, and skew is corrected by a resist roller pair 16. After that, it is conveyed to the transfer belt 11A. After that, the developer image is transferred to the sheet S, and the developer image transferred to the sheet S is heated by the fixing device 14 and fixed to the sheet S.

The sheet S whose image formation is completed by the image forming unit 11 is conveyed to the discharge roller pair 19 set on the upper surface side of the housing 10 by the conveying roller pair 17 and the intermediate roller pair 18. This transport path is called the first transport path L1. The sheet S for which the image formation is completed is discharged from the discharge roller pair 19 and loaded on the loading unit 20.

The discharge roller pair 19 can perform forward rotation in which the sheet S discharged from the image forming unit 11 is discharged to the loading unit 20 as it is, and reverse rotation in which the transport direction of the sheet S discharged from the image forming unit 11 is reversed. is there. When single-sided printing is performed, the discharge roller pair 19 causes the loading unit 20 to discharge the sheet S discharged from the image forming unit 11 as it is after the image formation on the surface is completed. On the other hand, when double-sided printing is performed, that is, when an image is formed on the back surface side as well, when the rear end side of the sheet S for which the image formation on the front surface is completed reaches the vicinity of the discharge roller pair 19, the transport direction is changed. The sheet S is inverted and conveyed toward the second transfer path L2.

The second transport path L2 is a path for guiding the sheet S whose transport direction is reversed by the discharge roller pair 19 to the inlet side of the image forming unit 11. The second transport path L2 is a path that branches off from the first transport path L1 and extends downward to the resist roller pair 16 through the lower side of the paper feed tray 15. A switching flapper 25 that selectively closes one of these transport paths is provided at the branch portion between the first transport path L1 and the second transport path L2.

In the laser printer 1, a sheet discharging device is configured including a discharging roller pair 19 and a loading unit 20. The sheet ejection device will be described in detail below.

1.2. Structure and Function of Sheet Discharge Device As shown in FIGS. 2 and 3, the sheet discharge device 2 includes a pressing member 22 and magnets 23A and 23B in addition to the discharge roller pair 19 and the loading unit 20 described above. Note that in FIG. 1, the presser member 22 and the magnets 23A and 23B are not shown.

As shown in FIG. 6, which will be described later, two sets of pressing members 22 are provided so as to be separated from each other in a direction orthogonal to the discharging direction of the sheet S, that is, in the width direction of the sheet S. Two sets of magnets 23A and 23B are also provided corresponding to the pressing member 22. Since the functions of these two sets of pressing members 22 and the magnets 23A and 23B are common, they will be described below without distinguishing them.

The pressing member 22 has a predetermined length and width, and is attached to the housing 10 side by a rotating shaft 22A on one end side in the length direction. The length of the pressing member 22 does not have to be larger than the width.

The pressing member 22 can rotate about the rotation shaft 22A by receiving an external force. When the pressing member 22 rotates, its tip, that is, the end opposite to the rotating shaft 22A, swings substantially up and down.

As shown in FIG. 2, the tip of the pressing member 22 is lowered by its own weight when it is not subjected to an external force other than gravity. The lowered tip presses the seat S loaded on the loading unit 20. As a result, curling is less likely to occur near the rear end of the seat S newly loaded on the loading portion 20, and curl generated near the rear end of the seat S is corrected. In this way, the state in which the tip of the pressing member 22 is lowered to press the sheet S loaded on the loading portion 20 is referred to as a "pressing state".

As shown in FIG. 3, the pressing member 22 is pushed up by the sheet S being discharged from the discharge roller pair 19, and the tip is raised so as to retract so as not to prevent the sheet S from being discharged. The state in which the tip of the pressing member 22 is raised and retracted from the discharge path of the sheet S in this way is referred to as a “retracted state”.

In the pressing member 22, the surface on the side in contact with the sheet S, that is, the lower surface in the state of FIG. 3 is referred to as "back surface", and the surface opposite to the back surface, that is, the upper surface in the state of FIG. 3 is referred to as "front surface".

A magnet 23A is attached to the vicinity of the tip on the surface of the pressing member 22. The magnet 23A has a small weight such as magnetic paint, and the influence of the weight increase of the pressing member 22 due to attaching the magnet 23A to the pressing member 22 is small. Further, on the housing 10 side, a magnet 23B is attached at a position facing the magnet 23A on the holding member 22 in the retracted state. The member to which the magnet 23B is attached is a cover member 24 arranged so as to face the surface of the pressing member 22 when the pressing member 22 is in the retracted state. The directions in which the magnets 23A and 23B are attached are the directions in which they are attracted to each other by facing each other.

The cover member 24 is formed with a rotation restricting member 24A that regulates the rotation range of the pressing member 22 on the retracted state side. The rotation restricting member 24A regulates the rotation range of the pressing member 22 so that the magnets 23A and 23B do not come into contact with each other.

1.3. Functions of magnets in the sheet discharging device The magnets 23A and 23B apply magnetic force to the pressing member 22 so as to reduce the load on the pressing member 22 on the sheet S being discharged. The strength of this magnetic force is such that when the push-up by the sheet S is canceled, the holding member 22 is allowed to fall due to its own weight. The force relationship applied to the pressing member 22 will be specifically described as follows.

When the discharge of the sheet S is started from the pressing state of FIG. 2, the tip of the sheet S first comes into contact with the back surface of the pressing member 22. The counterclockwise moment applied to the pressing member 22 due to this contact becomes larger than the clockwise moment applied to the pressing member 22 due to the weight of the pressing member 22. As a result, the pressing member 22 rotates counterclockwise.

When the discharge of the sheet S progresses and the tip of the sheet S exceeds the tip of the pressing member 22, the retracted state of FIG. 3 is reached, and the front surface of the sheet S comes into contact with the back surface of the pressing member 22. The force and moment acting on the pressing member 22 in the retracted state of FIG. 3 are as follows.
F1: The weight of the pressing member 22 applied to the center of gravity of the pressing member 22.
F2: An upward force exerted by the sheet S on the pressing member 22.
F3: The attractive force that the magnets 23A and 23B attract each other.
The moment when M1: F1 tries to rotate the pressing member 22 clockwise.
M2: A moment at which F2 tries to rotate the pressing member 22 counterclockwise.
M3: A moment at which F3 tries to rotate the pressing member 22 counterclockwise.

In the retracted state, the waist of the seat S is generally weakened, and the counterclockwise moment M2 applied to the pressing member 22 is reduced.

In this retracted state, if there are no magnets 23A and 23B and F3 and M3 are zero, the counterclockwise moment M2 applied to the pressing member 22 is the clockwise moment applied to the pressing member 22 due to the weight of the pressing member 22. It can be balanced with the moment M1. As a result, the discharge of the sheet S can be continued without the pressing member 22 reaching the upper limit of the rotation range regulated by the rotation restricting member 24A. Then, as compared with the state where the pressing member 22 reaches the upper limit of the rotation range, the discharge angle of the sheet S becomes downward, and the landing position of the tip of the sheet S becomes the front side, that is, the discharge roller vs. 19 side. ..

On the other hand, in the sheet discharging device 2 provided with the magnets 23A and 23B, F3 and M3 are generated due to the generation.
M1 <M2 + M3
As a result, a counterclockwise moment acts on the pressing member 22, and the sheet S is continuously discharged in a state where the pressing member 22 reaches the upper limit of the rotation range. Then, the discharge angle of the sheet S can be upward as compared with the state where the pressing member 22 does not reach the upper limit of the rotation range, and the landing position of the tip of the sheet S is from the back side, that is, from the discharge roller pair 19. It can be on the far side.

That is, the magnetic force applied to the pressing member 22 by the magnets 23A and 23B reduces the load on the pressing member 22 on the sheet S being discharged. As a result, the phenomenon that the landing position of the tip of the sheet S discharged by the action of the pressing member 22 is on the front side, that is, the discharge roller vs. 19 side is unlikely to occur, or even if it occurs, the degree is reduced. can do. As a result, it is possible to suppress or reduce the deterioration of the loadability of the seat S due to the provision of the pressing member 22.

When the discharge of the sheet S is completed and F2 becomes zero, the sheet S is discharged.
M1> M3
As a result, a clockwise moment acts on the pressing member 22 due to the above relationship. As a result, the pressing member 22 rotates clockwise and returns to the pressing state shown in FIG.

When the magnets 23A and 23B come into contact with each other, the force of attracting each other becomes remarkably large, and it may be difficult to allow the pressing member 22 to return to the pressing state. Therefore, the rotation restricting member 24A regulates the rotation range of the pressing member 22 so that the magnets 23A and 23B do not come into contact with each other.

1.4. Modification example of magnet arrangement As shown in FIGS. 4 to 6, magnets 23C and 23D may be provided at positions different from magnets 23A and 23B.

The magnet 23C is attached near the tip on the side surface of the pressing member 22. The magnet 23C also has a small weight such as magnetic paint, and the influence of the weight increase of the pressing member 22 due to attaching the magnet 23C to the pressing member 22 is small. Further, on the housing 10 side, a magnet 23D is attached at a position facing the magnet 23C of the holding member 22 in the retracted state. The member to which the magnet 23D is attached is the side wall member 20A of the loading portion 20. The directions in which the magnets 23C and 23D are attached are also directions in which they are attracted to each other by facing each other.

As shown in FIG. 6, two side wall members 20A are provided on the outer side of both ends in the width direction of the sheet S being discharged. Two pressing members 22 are provided along the two side wall members 20A, respectively. As a result, it is possible to effectively suppress the lifting of the sheet S that occurs on both ends in the width direction of the sheet S.

The magnet 23D may be attached to the side wall member 20A on the surface of the side wall member 20A on the pressing member 22 side, but in this case, a protrusion corresponding to the thickness of the magnet 23D is formed.

As shown in FIG. 7, by attaching the magnet 23D to the surface of the side wall member 20A opposite to the surface on the pressing member 22 side, the protrusion can be eliminated and the sheet S can be easily discharged.

Further, as shown in FIG. 8, when the side wall member 20A has a certain thickness, the magnet 23D may be embedded therein. Further, as shown in FIG. 9, a recess may be formed in the side wall member 20A, and the magnet 23D may be embedded therein.

In the configuration shown in FIGS. 4 to 8, the cover member 24 shown in FIGS. 2 and 3 is provided by providing the magnet 23D on the side wall member 20A provided along the swing direction of the pressing member 22. In comparison with the above, it becomes easier to secure the space above the pressing member 22. On the other hand, in the configuration in which the magnet 23B is attached to the cover member 24 shown in FIGS. 2 and 3, there is an advantage that the magnets 23A and 23B can be easily arranged to face each other and the magnetic force can be easily applied.

1.5. Other Modified Examples The following modified examples may be applied to the above-described configuration.

The pressing member 22 is assumed to rotate about the rotating shaft 22A, but is in a pressing state in which the seat S is lowered by its own weight to press the seat S loaded on the loading portion 20, and the seat S being discharged from the discharge roller pair 19. As long as it can swing with the retracted state pushed up by, movements other than rotation may be performed.

One of the magnets 23A and 23B and one of the magnets 23C and 23D may be a ferromagnet other than the magnet that generates a magnetic force that attracts each other with the magnet. Further, the ferromagnet may be provided separately from the pressing member 22, the cover member 24, and the side wall member 20A, but the pressing member 22, the cover member 24, and the side wall member 20A themselves constitute this ferromagnet. You may be doing it.

It is effective to provide a pair of pressing members 22 near both ends in the width direction of the sheet S being discharged. This is because the discharged sheet S tends to curl so that both ends in the width direction are lifted. However, the arrangement and the number of pressing members 22 are not limited to the above. For example, in addition to the pair of pressing members 22 shown in FIG. 6, one or more pressing members 22 may be added between them. As the pressing member 22 to be added, magnets 23A and 23B may be provided in the form shown in FIGS. 3 and 4.

2. Application to inkjet printers 2.1. Overview of an Inkjet Printer As shown in FIG. 10, in an inkjet printer 3, an image forming section 31 of an inkjet recording method is provided in a housing 30 substantially formed in a thin rectangular parallelepiped, and the image forming section 31 provides paper. An image is formed on the sheet S such as.

The image forming unit 31 records an image on the sheet S fed from the paper feed tray 32. The image forming unit 31 is arranged above the paper feed tray 32. The image forming unit 31 reciprocates in the direction perpendicular to the paper surface in FIG. A platen 33 for holding the sheet S horizontally is provided below the image forming portion 31. In the reciprocating movement process, the image forming unit 31 ejects ink supplied from an ink cartridge (not shown) from the nozzle 31A to the sheet S conveyed on the platen 33. As a result, the image is recorded on the sheet S.

The sheet S is placed on the paper feed tray 32, separated from the other sheets S below the sheet S by the paper feed roller 35 provided at the tip of the paper feed arm 34, and fed to the curved path L3. .. After that, the sheet S is sandwiched by the first transport roller pair 36 and transported onto the platen 33.

The sheet S on which the image is recorded on the platen 33 is further conveyed by being sandwiched between the second transfer roller 37 and the spur 38 pressed against the roller surface of the second transfer roller 37, and the path switching unit 39, And the third transfer roller 40 and the spur 41 pressed against the roller surface of the third transfer roller 40 are sequentially conveyed.

The path switching unit 39 is formed from the first path L4 from the second transfer roller 37 to the third transfer roller 40 and from the third transfer roller 40 to the fourth transfer roller pair 42 provided below the second transfer roller 37. Switch to the second path L5 to go.

The second path L5 and the fourth transfer roller pair 42 resupply the sheet S to the upstream side of the first transfer roller pair 36 by inverting the front and back sides.

In the inkjet printer 3, the sheet transfer device 4 includes the second transfer roller 37 and the path switching unit 39. In the following, the sheet transfer device 4 will be described in detail.

2.2. Structure and Function of Sheet Transfer Device The path switching unit 39 of the sheet transfer device 4 includes a rotation shaft 39A, a swing member 39B, and auxiliary rollers 39C / 39D. In the rocking member 39B, the lower surface in FIG. 10 is referred to as "back surface", and the surface opposite to the back surface, that is, the upper surface in the state of FIG. 10 is referred to as "front surface". Further, the sheet transfer device 4 includes a magnet 43A attached to the surface of the swing member 39B and a magnet 43B attached to a frame 44 provided above the swing member 39B.

The rotation shaft 39A is attached to a frame 44 provided above the path switching portion 39, and rotatably supports the swing member 39B.

The swing member 39B is a member also called a flap, which has one end on the rotation shaft 39A side and a tip on the third transport roller 40 side. The tip has an L-shape that is bent upward, and has an end face that faces the third transport roller 40.

By being pivotally supported by the rotating shaft 39A, the swinging member 39B can swing between a descending state of being lowered by its own weight and an ascending state of being pushed up by a sheet being transported by the second transport roller 37. is there. In FIG. 10, the swinging member 39B in the descending state is shown by a solid line, and the swinging member 39B in the rising state is shown by a broken line.

The swinging member 39B in the lowered state is arranged across the first path L4 from the second transport roller 37 to the third transport roller 40, the rotation shaft 39A side is above the first path L4, and the tip side is the first. It is below the route L4.

When the sheet S is conveyed from the second transfer roller 37 toward the third transfer roller 40 in this state, the tip of the sheet S first comes into contact with the back surface of the swing member 39B. The counterclockwise moment applied to the rocking member 39B due to this contact becomes larger than the clockwise moment applied to the rocking member 39B due to the weight of the rocking member 39B. As a result, the swing member 39B is rotated counterclockwise and pushed up to shift to the ascending state.

When the transfer of the sheet S progresses and the tip of the sheet S exceeds the tip of the swing member 39B, the front surface of the sheet S comes into contact with the auxiliary rollers 39C / 39D provided on the back surface of the swing member 39B. Further, when the transfer of the seat S progresses and the rear end of the seat S exceeds the tip of the swing member 39B, the swing member 39B rotates clockwise and shifts to a descending state.

When the seat S is back-fed from the third transport roller 40 while the rocking member 39B is in the lowered state, the seat S comes into contact with the end face of the rocking member 39B and is guided to the second path L5 side. .. As a result, the switchback transfer of the sheet S is realized.

The magnets 43A and 43B have the same functions as the magnets 23A and 23B in the laser printer.

That is, when the rocking member 39B is in the ascending state, a magnetic force is applied to the rocking member 39B so as to reduce the load of the rocking member 39B on the seat S being conveyed. Further, the strength of this magnetic force is such that when the push-up by the seat S is canceled, the rocking member 39B is allowed to descend due to its own weight.

Further, the magnet 43A has a small weight such as magnetic paint, and the influence of the weight increase of the rocking member 39B due to attaching the magnet 43A to the rocking member 39B is small.

Further, the magnets 43A and 43B are arranged so as to face each other when the swing member 39B is in the ascending state, and the directions in which the magnets 43A and 43B are attached are such that they attract each other by facing each other. is there.

Further, the rotation range of the swing members 39B is regulated so that the magnets 43A and 43B do not come into contact with each other when the swing members 39B are in the raised state.

By providing the magnets 43A and 43B, when the rocking member 39B is in the raised state, the load on the rocking member 39B applied to the sheet S during transportation is reduced, so that the sheet S during transportation is defective or damaged. Is difficult to express, or even if it is expressed, its degree can be reduced.

2.3. Deformation example Also in the sheet transfer device 4, the above 1.4. Or 1.5. A modified example of the sheet discharging device 2 described in the above can be appropriately applied.

For example, the magnets 43A and 43B may be arranged so as to face each other in the lateral direction as in the magnets 23C and 23D, instead of being arranged so as to face each other vertically.

Further, the swing member 39B may perform a motion other than rotation as long as it can swing between the descending state lowered by its own weight and the raised state pushed up by the seat S being conveyed.

Further, one of the magnets 43A and 43B may be a ferromagnet that generates a magnetic force that attracts each other with the magnet instead of the magnet. Further, the ferromagnet may be provided separately from the rocking member 39B and the frame 44, but the rocking member 39B and the frame 44 itself may constitute the ferromagnet.

Further, a pair of swinging members 39B may be provided in the width direction of the sheet S being conveyed, or a plurality of swinging members 39B may be provided.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1 Laser printer 2 Sheet discharge device 3 Inkjet printer 4 Sheet transfer device 19 Discharge roller pair 20 Loading part 20A Side wall member 22 Presser member 23A / 23B / 23C / 23D Magnet 24 Cover member 24A Rotation control member 36 First transfer roller pair 37 2nd Conveying Roller 39 Path Switching Part 39B Swinging Member 40 3rd Conveying Roller 43A / 43B / 43C / 43D Magnet 44 Frame

Claims (7)

A discharge roller that discharges the sheet and
A loading section on which the sheet discharged by the discharge roller is loaded and
A pressing member that can swing between a pressing state in which the seat is lowered by its own weight and pressed by the seat loaded on the loading portion and a retracted state in which the seat is pushed up by the seat being discharged from the discharging roller.
A magnetic force is applied to the pressing member so as to reduce the load of the pressing member applied to the discharging sheet, and the strength of the magnetic force of the pressing member is increased when the pushing up by the sheet is canceled. A magnet that allows descent due to its own weight,
A seat ejector equipped with. A side wall member provided along the swing direction of the holding member and
It is provided with a ferromagnet that generates the magnetic force by attracting the magnet to each other.
One of the magnet and the ferromagnet is provided on the holding member, and the other is provided on the side wall member.
The sheet discharging device according to claim 1. The other side of the magnet and the ferromagnet is embedded in a recess formed in the side wall member or inside, or is provided on a surface opposite to the surface of the side wall member on the pressing member side.
The sheet discharging device of claim 2. Two side wall members are provided on the outer side of both ends of the discharging sheet in the width direction.
Two pressing members are provided along the two side wall members, respectively.
The sheet discharging device according to claim 2 or 3. A cover member arranged so as to face the pressing member when the pressing member is in the retracted state,
A ferromagnetic material that generates the magnetic force by attracting each other to the magnet.
One of the magnet and the ferromagnet is provided on the holding member, and the other is provided on the cover member.
The sheet discharging device according to claim 1. By rotating, the pressing member swings between the pressing state and the retracted state.
A rotation restricting member that regulates the rotation range of the pressing member on the retracted state side is provided.
The sheet discharging device according to any one of claims 1 to 5. A transport roller that transports the sheet and
A swinging member that can swing between a descending state that is lowered by its own weight and an ascending state that is pushed up by a sheet being conveyed by the transfer roller.
A magnetic force is applied to the swinging member so as to reduce the load of the swinging member on the sheet being conveyed, and the strength of the magnetic force is increased when the pushing up by the sheet is eliminated. A magnet that allows the moving member to descend due to its own weight,
A sheet transfer device comprising.

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