JP6456081B2 - Sheet conveying apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet conveying apparatus and an image forming apparatus that facilitate alignment in the sheet width direction when conveying a sheet.

  2. Description of the Related Art Conventionally, an image forming apparatus such as an electrophotographic printer includes a sheet conveying device that reverses a sheet on which an image is formed on one side and conveys the sheet again to an image forming unit, and forms an image on both sides of the sheet There is something. In such a conventional sheet conveying apparatus, when the sheet is conveyed again to the image forming unit, the sheet may be skewed during conveyance, and the sheet and the image may be misaligned when an image is formed on the back surface. This is because when the image is formed on the second side (back side), the conveyance path until the image is formed on the sheet is longer than that on the first side (front side). This is also because the sheet is slightly displaced during conveyance due to a difference in resistance on the conveyance surface. In order to prevent such sheet misalignment, it is necessary to adjust the position of the sheet so that the image and the sheet coincide after the image is formed on the first side and before the image is formed on the second side.

  As such a sheet position adjusting method, for example, one end side in a direction orthogonal to the sheet conveying direction (hereinafter referred to as the width direction) is guided to a re-conveying path for conveying a sheet on which an image is formed on the first surface to the image forming unit again. Some reference guides are arranged. There is a method of aligning the sheet in the width direction (hereinafter referred to as lateral registration correction) by conveying the sheet while pressing the sheet against the reference guide (see Patent Document 1).

  In addition, there is an image forming apparatus provided with such a sheet conveying apparatus that forms images on two different size sheets, for example, a letter size sheet and an A4 size sheet. As described above, when an image is formed on a plurality of sizes of sheets, it is necessary to switch the position of the reference guide in the width direction according to the size. Conventionally, this switching is performed using a drive by a motor or the like. There is a thing (refer patent document 2).

JP 2000-233850 A JP-A-8-292612

  However, in the above conventional example, a dedicated motor, gear, etc. are required, so that the size of the product is increased or the cost is required. It is assumed that many users do not frequently switch the position of the reference guide in the width direction. It is undesirable to put a lot of cost on such a mechanism.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet conveying apparatus and an image forming apparatus provided with the sheet conveying apparatus that improve the operability while switching the position in the width direction of a guide member that guides a sheet is small and low cost. is there.

In order to achieve the above object, a representative configuration according to the present invention includes a skew feeding member for transporting a sheet obliquely with respect to the transport direction, and a sheet transported by the skew feeding member in the transport direction. A conveyance guide member that a lateral end of the orthogonal width direction abuts on and a movement mechanism for moving the conveyance guide member in the width direction, and the movement mechanism is formed obliquely with respect to the conveyance direction. A guide groove having an oblique groove portion, a fitting member that fits into the guide groove, a movably provided by receiving an external force from the first direction, and a direction opposite to the first direction. An operation member provided so as to be movable by receiving an external force from a second direction and changing a positional relationship between the fitting member and the guide groove, and the first direction provided on the operation member And out of the second direction Has a working portion for receiving a first acute angle side imaginary straight line of the first direction and the same direction of the virtual straight line and the oblique groove is is formed in the same direction are formed, It is smaller than the second angle on the acute angle side formed by a virtual straight line in the same direction as the transport direction and a virtual straight line in the same direction as the direction in which the oblique groove is formed.

  According to the present invention, the mechanism for manually moving the transport guide member in the width direction is a small and low-cost mechanism, and the force for operating the mechanism is in a predetermined relationship with the direction of the guide groove. Thus, the operability in which the operation force required for switching is suppressed can also be satisfied.

It is a figure explaining the double-sided conveyance unit which concerns on 1st Embodiment. It is a figure explaining the double-sided conveyance unit which concerns on 1st Embodiment. It is a figure explaining the switching mechanism of the position of the width direction of the reference | standard guide which concerns on 1st Embodiment. It is a figure explaining the switching mechanism of the position of the width direction of the reference | standard guide which concerns on 1st Embodiment. It is a figure explaining the switching mechanism of the position of the width direction of the reference | standard guide which concerns on 1st Embodiment. It is a figure explaining the switching mechanism of the position of the width direction of the reference | standard guide which concerns on 1st Embodiment. It is a figure explaining the switching mechanism of the position of the width direction of the reference | standard guide which concerns on 1st Embodiment. It is a figure which shows the relationship between the direction of the force to an operation member, the direction of an operation member guide groove, and a sheet conveyance direction. It is a figure explaining the switching mechanism of the position of the width direction of the reference | standard guide which concerns on 2nd Embodiment. 1 is a diagram illustrating an outline of an image forming apparatus.

  Next, a sheet conveying apparatus according to an embodiment of the present disclosure will be described by exemplifying an image forming apparatus including the sheet conveying apparatus.

Embodiment 1
<Overall configuration of image forming apparatus>
FIG. 10 is a schematic sectional view of a printer which is an image forming apparatus according to the present embodiment. The overall configuration of the image forming apparatus will be described together with the operation with reference to this figure.

  The sheet S is fed by the feeding roller 11 from the cassette 10 that stacks and stores the sheet S at the bottom of the image forming apparatus 1. The sheet S is conveyed through the intermediate conveying roller pair 15 and the registration roller pair 16 to the image forming process unit 2 that forms the image forming unit. The laser light emitted from the scanner unit 4 is emitted onto the photosensitive drum 3 rotating in the clockwise direction in the figure, and an electrostatic latent image is formed on the photosensitive drum 3. The electrostatic latent image is developed into a toner image by a developing unit in the image forming process unit 2. The toner image formed on the photosensitive drum 3 is transferred to the sheet S by the transfer roller 5. Heat and pressure are applied to the sheet S on which the toner image has been transferred by the fixing roller pair 6. As a result, the toner image is fixed on the sheet S. Thereafter, the sheet S passes through the discharge roller pair 17 and the discharge roller pair 18 and is discharged onto the discharge tray 7.

  On the other hand, when recording on both sides of the sheet, the discharge roller pair 18 conveys the sheet S toward the discharge tray 7 by normal rotation, and then reverses after the trailing edge of the sheet S passes through the fixing discharge guide 19. Here, when the trailing edge of the sheet S passes through the fixing discharge guide 19, the trailing edge moves toward the discharge reversing guide 20 due to the stiffness. Further, when the discharge roller pair 18 is reversed in this state, the sheet S is guided to the duplex conveyance unit 30. Then, the sheet S passes through the re-conveying path 32 while the skew feeding is corrected by the skew feeding roller pair 31. Thereafter, the sheet is fed again to the image forming process unit 2 through the refeed roller 80, the intermediate transport roller pair 15, and the registration roller pair 16, and the second image is formed. Thereafter, the discharge roller pair 17, the discharge roller It passes through the pair 18 and is discharged onto the discharge tray 7.

<Double-sided conveyance unit>
The double-sided conveyance unit 30 reversely conveys a sheet having an image formed on the first surface and conveys it again to the image forming unit in order to form an image on the second surface. If the sheet is skewed when the sheet is conveyed by the duplex conveying unit 30, the sheet and the image are shifted when an image is formed on the second surface. Therefore, in order to prevent this, sheet skew correction means is provided.

  Next, the duplex conveyance unit 30 will be described with reference to FIGS. 1 and 2 show a state in which the duplex conveying unit 30 is viewed obliquely from below. 3 and 4 show a state in which the lateral registration correction unit 40 is viewed from above the image forming apparatus. FIG. 5 shows an exploded state of the lateral registration correction unit 40.

  First, the entire duplex conveyance unit 30 will be described with reference to FIGS. The double-sided conveyance unit 30 includes a pair of skew feeding rollers 31 that is a diagonal feeding member that conveys a sheet obliquely with respect to the conveyance direction, a reference guide 41 that is a conveyance guide member that abuts the width direction side end of the sheet, and the like. A lateral registration correction unit 40 is provided. The re-transport path 32 (see FIG. 10) includes a first transport upper guide 72 and a transport lower guide 70, a reference guide 41 and a second transport upper guide 73. The lower conveyance guide 70 constituting the lower surface of the re-conveyance path 32 is provided in parallel with the reference guide 41 and the second conveyance upper guide 73. That is, the sheet S passing through the re-conveying path 32 is sent again to the image forming process unit 2 through the conveying lower guide 70, the reference guide 41, and the like.

  Further, as shown in FIG. 2, the lower conveyance guide 70 is configured to open downward from the image forming apparatus 1 with a rotation center 71 as a center. Thereby, the sheet S jammed due to conveyance failure can be removed. In the closed state as shown in FIG. 1, the first transport upper guide 72 is locked by a lock mechanism (not shown).

  Next, the lateral registration correction unit 40 will be described with reference to FIGS. For the sake of explanation, a part of the reference guide 41 is notched in FIGS. The sheet S is conveyed to the lateral registration correction unit 40 from the direction indicated by the arrow A by the discharge roller pair 18 (see FIG. 10). A continuous introduction surface 42 and a reference surface 43 are provided at one end of the reference guide 41 in the width direction of the sheet, which is a direction orthogonal to the sheet S conveyance direction (arrow A direction).

  The introduction surface 42 is formed to be inclined with respect to the re-conveying path 32 in the opening direction. This is for guiding the sheet S conveyed while being shifted in the width direction to the reference surface 43. The reference surface 43 is used to perform lateral registration correction in the width direction of the sheet S by the sheet S being pressed by the skew feeding roller pair 31 when the sheet S passes through the re-conveying path 32. Further, the reference guide 41 has a U-shaped cross section as shown in FIG. 6, and has a width direction of the sheet S and a conveyance guide surface on the upper and lower surfaces of the sheet S. For this reason, the pressed sheet S does not fall off from the reference surface 43.

  As shown in FIG. 3, the pair of skew feeding rollers 31 serving as a skew feeding member is composed of a skew feeding roller 36 that is in oblique contact with the skew feeding roller 37 with a predetermined skew feeding angle. The oblique feeding roller 37 and the oblique feeding roller shaft 33 are configured to rotate integrally, and an oblique feeding roller gear 34 is disposed at the end of the oblique feeding roller shaft 33. The skew feeding roller support member 50 is rotatably held via a skew feeding roller bearing 35, and is driven to rotate by receiving a driving force from the image forming apparatus 1. The oblique feeding roller 36 is provided on the second conveyance upper guide 73 and is always in pressure contact with the oblique feeding roller 37 with a predetermined pressure by a spring (not shown).

  The skew feeding roller pair 31 configured in this way acts to bring the sheet S conveyed by the discharge roller pair 18 provided upstream of the lateral registration correction unit 40 in the sheet conveying direction to the reference surface 43. Then, the sheet S is conveyed while abutting against the reference surface 43. Thus, the sheet S is aligned in the width direction and conveyed toward the refeed roller 80 provided downstream of the lateral registration correction unit 40.

  By the way, when performing lateral registration correction in which the sheet S is obliquely fed and the position in the width direction is adjusted while pressing the sheet S against the reference surface 43 of the reference guide 41, the amount of skew feeding the sheet S toward the reference surface 43 is obliquely fed. It depends on the transport distance transported by the roller pair 31 and the nip pressure of the skew feeding roller pair 31.

  If the transport distance transported by the pair of skew feed rollers 31 is long, the skew feed amount also increases. On the contrary, if the transport distance transported by the pair of skew feeding rollers 31 is short, the skew feeding amount is also reduced. In order to reduce the size of the apparatus, it is necessary to shorten the transport distance of the skew feeding roller pair 31. However, depending on the size of the sheet S, there may be a case where a sufficient amount of skew feeding to approach the reference surface 43 cannot be obtained.

  Therefore, it is necessary to increase the skew feeding amount. For this purpose, the nip pressure of the skew feeding roller pair 31 must be set high. However, when the nip pressure is set to be high in this way, as shown in FIG. 6, the thin sheet S has a too close force to the reference surface 43, so the sheet S bends, and the position of the sheet in the width direction with respect to the reference surface 43. Will be re-transferred.

  Therefore, in the present embodiment, the reference guide 41 can be manually moved to a position corresponding to the length of the sheet S in the width direction. Ideally, it is desirable to correspond to sheets S of various sizes, but here, it is configured to correspond to two positions of LTR size and A4 size that are generally used.

<Switching mechanism for the position of the reference guide in the width direction>
Next, the configuration of a switching mechanism (moving mechanism) for moving the reference guide, which is a feature of the present embodiment, in the width direction to switch the position in the width direction will be described with reference to FIGS.

  In the figure, 60 is an operation member, 50 is an oblique feed roller support member, 51 and 52 are operation member guide pins (fitting members), 51 is a first fitting member, and 52 is a second fitting member. It is. Reference numerals 61 and 62 denote operation member guide grooves (guide grooves), where 61 is a first guide groove and 62 is a second guide groove. Reference numerals 44 and 45 denote reference guide guide pins, reference numerals 53 and 54 denote reference guide guide grooves, reference numeral 46 denotes a first engagement portion, and reference numeral 63 denotes a second engagement portion that engages with the first engagement portion 46.

  The operation member 60 is provided with operation member guide grooves 61 and 62. The operation member 60 is movably provided by a user operation, and relatively changes the positional relationship between the operation member guide pins 51 and 52 and the operation member guide grooves 61 and 62.

  The two operation member guide pins 51 and 52 are provided on the same straight line in the conveying direction of the sheet S in the skew feeding roller support member 50. The operation member guide pin 51 is slidably fitted in the operation member guide groove 61, and the operation member guide pin 52 is slidably fitted in the operation member guide groove 62. The oblique feed roller support member 50 is a fixed member fixed to the first transport upper guide 72.

  As shown in FIG. 3, the operation member guide grooves 61 and 62 are formed of first grooves 61a and 62a, second grooves 61b and 62b, and third grooves 61c and 62c that are continuously formed. Specifically, second grooves (oblique groove portions) 61 b and 62 b are formed obliquely with respect to the sheet S conveyance direction. Then, a first groove (first continuous groove portion) is formed in parallel with the one side (upstream side) of the second grooves 61b and 62b in parallel with the sheet conveying direction, and is also continuous with the other side (downstream side). The third grooves (second continuous groove portions) 61c and 62c are formed in parallel with the sheet conveying direction.

  Here, the second grooves 61b and 62b are inclined in the closing direction with respect to the conveying direction of the sheet S, starting from the first grooves 61a and 62a. That is, the first grooves 61a and 62a are located on the outer side in the width direction of the sheet S than the third grooves 61c and 62c. Accordingly, the operation member 60 is configured to move in the width direction while moving in the same direction as the conveyance direction of the sheet S.

  Further, the first grooves 61a and 62a and the third grooves 61c and 62c are provided with small protrusions (projections) 65 as shown in FIG. The small protrusion 65 is a protrusion that applies a load to the relative movement of the operation member guide grooves 61 and 62 with respect to the operation member guide pins 51 and 52. And the operation member guide pins 51 and 52 are arrange | positioned so that the state which adjoined to each groove end surface may be maintained. When an external force is applied to the operation member 60, the small protrusion 65 is deformed and the operation member 60 can be moved.

  On the other hand, as shown in FIG. 5, the two reference guide guide pins 44 and 45 are provided on the reference guide 41 on the same straight line in the sheet S conveyance direction. Reference guide guide pin tips 44a and 45a are provided at the tips of the reference guide guide pins 44 and 45, respectively. The reference guide guide pin tip 44a is slidably fitted in the reference guide guide groove 53, and the reference guide guide pin tip 45a is slidably fitted in the reference guide guide groove 54.

  The reference guide guide grooves 53 and 54 are long holes formed long in the width direction of the sheet S. Accordingly, the reference guide 41 is configured to move in the width direction of the sheet S. A threaded portion is formed at the center of the reference guide guide pins 44 and 45. The height of the reference guide guide pin tips 44 a and 45 a is set to be slightly larger than the thickness of the oblique feed roller support member 50. Accordingly, the reference guide 41 is slidably held by the oblique feed roller support member 50 via the reference guide guide pins 44 and 45 and the screw 55. That is, the reference guide 41 is engaged with the fixed feeding roller support member 50 so as to be movable in the sheet width direction.

  Further, the reference guide 41 and the operation member 60 are slidably engaged with each other by the first engagement portion 46 and the second engagement portion 63 so as to slide in the sheet conveying direction. In the present embodiment, the first engaging portion 46 is formed by bending from the reference guide 41, and the second engaging portion 63 is formed in the operation member 60 by a linear groove. Therefore, when the operation member 60 moves, the reference guide 41 also moves while the engaging portions slide.

  The first engagement portion 46 and the second engagement portion 63 are located on the inner side in the width direction of the sheet S with respect to the operation member guide pins 51 and 52. Therefore, as shown in FIG. 3, the reference guide 41 is positioned closer to the inner side in the width direction of the sheet S (corresponding to the A4 size) when the operation member guide pins 51 and 52 are close to the end surfaces of the first grooves 61a and 62a. To position. On the other hand, as shown in FIG. 4, when the operation member guide pins 51 and 52 are close to the end surfaces of the third grooves 61c and 62c, the operation member guide pins 51 and 52 are positioned closer to the outer side in the width direction of the sheet S (positions corresponding to the LTR size).

  Here, a portion where the user actually operates in the operation member 60 is referred to as an action portion 64. The action portion 64 passes through the second groove 62b of the operation member guide groove 62, and is disposed in a region of an extension line of the virtual straight line L1 (substantially on the center line in the present embodiment) in the same direction as the direction in which the second groove 62b is formed. Has been. Further, the action portion 64 is formed in a surface shape substantially orthogonal to the virtual straight line L1. For this reason, the action part 64 has the 1st action part 64a and the 2nd action part 64b, as shown in FIG. The first action part 64a is a part that acts when pushing out the operation member 60 in order to apply a force in the direction of arrow B (first direction) in FIG. On the other hand, as shown in FIG. 4, the second action part 64 b is a part that acts when pulling out the operation member 60 in order to apply a force in the direction of the arrow C (second direction) opposite to the arrow B. is there.

  The operation member 60 is configured as a long member in the same direction as the virtual straight line L1. And since the said action part 64 is a surface substantially orthogonal to the said virtual straight line L1, when a user pushes the 1st action part 64a or pulls the 2nd action part 64b, the force is operated. It becomes easy to guide in the longitudinal direction of the member 60. For this reason, when the user operates the operation member 60 with the action portion 64, the direction of the operation force (the first direction and the second direction) acts in the same direction as the virtual straight line L1 as it is.

<Switching operation of the reference guide in the width direction>
Next, a series of position switching operations of the reference guide 41 will be described with reference to FIGS.

  FIG. 3 shows a state in which the reference guide 41 is at a position corresponding to the A4 size of the sheet S. The groove end surfaces of the first grooves 61 a and 62 a of the operation member guide grooves 61 and 62 are located in contact with the operation member guide pins 51 and 52. At this time, the reference guide 41 is positioned closer to the inner side in the width direction of the sheet S as shown in FIG. In FIG. 5, the reference guide guide pin tips 44 a and 45 a are also positioned closer to the inside in the width direction of the sheet S in the reference guide guide grooves 53 and 54.

  Here, when an external force is applied to the action portion 64a shown in FIG. 5 in the direction of the arrow B shown in FIG. 3, the small protrusions 65 (see FIG. 7) provided in the first grooves 61a and 62a are deformed and the operating member is deformed. 60 begins to move. The sliding relationship between the operation member guide pins 51 and 52 and the operation member guide grooves 61 and 62 changes from the first grooves 61a and 62a to the second grooves 61b and 62b and the third grooves 61c and 62c. And the small protrusion 65 (refer FIG. 7) provided in the 3rd groove | channels 61c and 62c deform | transforms, and the groove end surface of the 3rd groove | channels 61c and 62c moves to the state which contact | connected the operation member guide pins 51 and 52. FIG. That is, the operation member 60 moves in the same direction as the conveyance direction of the sheet S and also moves outside in the width direction of the sheet S.

  As the operating member 60 moves, the reference guide 41 slidably engaged by the first engaging portion 46 and the second engaging portion 63 shown in FIG. 5 also moves. Then, the reference guide 41 is guided by the reference guide guide pin tips 44a and 45a and the reference guide guide grooves 53 and 54, and as shown in FIG. 4, at the outer side in the width direction of the sheet S, that is, at a position corresponding to the LTR size. Can be switched.

  The reference guide 41 moves in the width direction of the sheet S while the operation member guide pins 51 and 52 and the second grooves 61b and 62b slide. That is, in this process, the external force applied to the action part 64 is converted into a force that moves the reference guide 41 in the width direction of the sheet S. Efficiently performing this force conversion leads to a reduction in operating force required to move the operating member 60.

  If the action part 64 is such that an external force is applied in the direction of arrow D shown in FIG. 3 (a direction parallel to the sheet conveying direction), the operation member 60 moves the operation member guide pin 51 and the operation member guide pin 52. The center receives a rotating force. As a result, the sliding resistance between the second grooves 61b and 62b and the operation member guide pins 51 and 52 is increased. For this reason, the force required to move the operation member 60 increases.

  In this embodiment, the action part 64 is located on a substantially center line of the second groove 62b. Therefore, the direction of the force applied via the action portion 64 is along the second grooves 61b and 62b, and the sliding resistance between the second grooves 61b and 62b and the operation member guide pins 51 and 52 is reduced. Therefore, the force required for the movement of the operation member 60 can be small.

  Further, when the state shown in FIG. 4 is changed to the state shown in FIG. 3, that is, in order to move the reference guide 41 from the position corresponding to the LTR size to the position corresponding to the A4 size, the action portion 64b shown in FIG. An external force in the direction of arrow C opposite to the direction is applied. Also in this case, since the action part 64 is located substantially on the center line of the second groove 62b, the sliding resistance between the second grooves 61b and 62b and the operation member guide pins 51 and 52 is small. Therefore, the force required for the movement of the operation member 60 can be small.

In addition, since the action part 64 is located on the substantially center line of the 2nd groove | channel 62b, the sliding resistance of the 1st groove | channel 61a, 61b, the 3rd groove | channel 61c, 62c, and the operation member guide pin 52 becomes large. But,
The lengths of the first grooves 61a and 62a and the third grooves 61c and 62c are set shorter than the lengths of the second grooves 61b and 62b, which are the oblique groove portions. For this reason, the sliding distance of the operation member guide pin 52, the first grooves 61a and 62a, and the third grooves 61c and 62c is sufficiently smaller than that of the second grooves 61b and 62b. For this reason, there is little influence on the force required for the movement of the operation member 60.

  Further, even when the user accesses the action portion 64 from the X direction shown in FIG. 3, the action portion 64a is formed in a surface shape substantially perpendicular to the center line of the second groove 62b. Easy to guide in the B direction. The same applies to the user access in the Y direction in FIG.

  Here, in the present embodiment, the direction (first direction, second direction) in which the force is applied to the operation member 60 via the action portion 64 is made to coincide with the substantially center line of the second groove 62b. did. However, if the direction in which this force is applied does not completely coincide with the center line but is within a predetermined range, the sliding resistance between the second grooves 61b and 62b and the operation member guide pins 51 and 52 is reduced. Can do.

More specifically, as shown in FIG. 8, a virtual straight line in the same direction as the direction (first direction) in which force is applied to the operation member 60 is defined as L1. Further, an imaginary straight line in the same direction as the direction in which the second groove 62b that is the oblique groove is formed is defined as L2. An imaginary straight line in the same direction as the sheet conveyance direction is L3. At this time, the acute angle A (first angle) formed by the straight line L1 and the straight line L2 is smaller than the acute angle B (second angle) formed by the straight line L2 and the straight line L3. (A <B). With this configuration, when the operation member 60 moves by applying force to the action portion 64, the operation member guide pins 51 and 52 and the second groove 61b are more effective than applying force in the same direction as the sheet conveyance direction. , 62b, the sliding resistance is reduced.

In the configuration in which two operation member guide grooves 61 and 62 are arranged in the sheet conveyance direction and the operation member 60 is provided in the vicinity of one operation member guide groove 62 as in the present embodiment, FIG. As shown in FIG. 8, it is preferable that the angle B is smaller than the angle C, where C is an acute angle angle (third angle) formed by the straight line L1 and the straight line L3. B <C).

  In the present embodiment, as shown in FIG. 3, in the configuration in which two operation member guide grooves 61 and 62 and two operation member guide pins 51 and 52 are engaged, the operation member 60 is one operation member guide groove. It is provided in the vicinity of 62. In this case, by setting the angle B <angle C, the operation member 60 is inclined toward the other operation member guide groove 61 with reference to the virtual straight line L2 in the same direction as the direction of the second groove 62b. In this case, when a force is applied to the operation member 60 in order to move the reference guide 41 in the width direction, the force is applied between one operation member guide groove 62 and the other operation member guide groove 61. The force for rotating the operation member 60 can be suppressed.

  As described above, if the operation member guide pins 51 and 52 and the operation member guide grooves 61 and 62 are slid, the operation member 60 is moved, and the reference guide 41 is configured to move in conjunction therewith, A small and low-cost switching mechanism for the position in the width direction of the reference guide 41 can be provided. Then, by disposing the action portion 64 on the approximate center line of the second groove 62b that is the slope of the operation member guide groove 62, it is possible to suppress the operation force of the operation member 60 and satisfy the operability. Can be realized.

  In this embodiment, the configuration in which the operation member guide pins 51 and 52 and the operation member guide grooves 61 and 62 are fitted, and the configuration in which the reference guide guide pins 44 and 45 and the reference guide guide grooves 53 and 54 are fitted have been described. . However, the same effect can be obtained by reversing the relationship between the pin and the groove.

[Embodiment 2]
Next, another embodiment of the operation member 60 will be described with reference to FIG. In the second embodiment, the position where the operation member 60 is provided is different from the first embodiment, and the position of the action portion 64 is different. The rest is the same as in the first embodiment.

  In the present embodiment, as shown in FIG. 9, the action portion 64 is provided in a range sandwiched between the approximate center line of one second groove 61b and the approximate center line of the other second groove 62b. Specifically, an imaginary straight line that passes through the second groove 61b of the operation member guide groove 61 that is the first guide groove and is in the same direction as the direction in which the second groove 61b is formed is defined as L4. Further, an imaginary straight line passing through the second groove 62b of the operation member guide groove 62, which is the second guide groove, in the same direction as the direction in which the second groove 62b is formed is defined as L2. At this time, the action part 64 which receives the force by a user's operation is arrange | positioned in the area | region between the said straight line L4 and the straight line L2.

  In the first embodiment, the action portion 64 is located on a substantially center line of the second groove 62b. Even in this case, the operation member 60 receives a slight rotating force with the operation member guide pin 51 as the center. As a result, the sliding resistance between the second groove 62b and the operation member guide pin 51 is slightly generated.

  On the other hand, in this embodiment, the force which the operation member 60 rotates can further be suppressed by arrange | positioning the action part 64 as mentioned above. As a result, the sliding resistance between the second groove 62b and the operation member guide pin 51 is also reduced. Therefore, the force required to move the operation member 60 can be smaller than that in the first embodiment, and the operability is improved.

DESCRIPTION OF SYMBOLS 3 ... Photosensitive drum 30 ... Double-sided conveyance unit 31 ... Skew feeding roller pair 36 ... Skew feeding roller 37 ... Skew feeding roller 40 ... Lateral registration correction unit 41 ... Reference guide 43 ... Reference surface 44, 45 ... Reference guide guide pin 46 ... First engaging portion 50... Inclined feeding roller support member 51, 52 .. operation member guide pin 53, 54 .. reference guide guide groove 60 .. operation member 61, 62 .. operation member guide groove 61a, 62a. 62b ... second groove 61c, 62c ... third groove 63 ... second engaging part 64 ... action part 64a ... first action part 64b ... second action part 65 ... small protrusion

Claims (14)

A skew feeding member for conveying the sheet obliquely with respect to the conveying direction;
A conveyance guide member with which a side edge in a width direction perpendicular to the conveyance direction of the sheet conveyed by the skew feeding member abuts,
A moving mechanism for moving the transport guide member in the width direction,
The moving mechanism includes a guide groove having an oblique groove formed obliquely with respect to the transport direction, a fitting member fitted into the guide groove,
Provided to be movable by receiving an external force from a first direction, and provided to be movable by receiving an external force from a second direction that is opposite to the first direction, and the fitting member An operation member that relatively changes the positional relationship of the guide grooves;
An action portion provided on the operating member for receiving an external force from the first direction and the second direction;
Have
The first angle on the acute side formed by the virtual straight line in the same direction as the first direction and the virtual straight line in the same direction as the direction in which the oblique groove is formed is the virtual straight line in the same direction as the transport direction and the diagonal A sheet conveying apparatus, wherein the sheet conveying apparatus is smaller than a second angle on an acute angle side formed by a virtual straight line in the same direction as the direction in which the groove is formed.   The said 2nd angle is smaller than the 3rd angle of the acute angle side which the virtual straight line of the same direction as said 1st direction and the virtual straight line of the same direction as the said conveyance direction form. Sheet conveying device.   The sheet conveying apparatus according to claim 1, wherein the action portion is disposed in a region of an extension line of the oblique groove portion. A skew feeding member that conveys the sheet obliquely with respect to the conveyance direction;
A conveyance guide member with which a side edge in a width direction perpendicular to the conveyance direction of the sheet conveyed by the skew feeding member abuts,
A moving mechanism for moving the transport guide member in the width direction,
The moving mechanism includes a first guide groove having an oblique groove formed obliquely with respect to the transport direction, a first fitting member fitted into the first guide groove,
A second guide groove having an oblique groove formed obliquely with respect to the transport direction; a second fitting member fitted into the second guide groove;
The first fitting is provided movably by receiving an external force from the first direction and movably provided by receiving an external force from a second direction opposite to the first direction. wherein a part member first guide groove, and an operation member for relatively changing the positional relationship of the second of said fitting portion member second guide grooves,
A working portion provided on the operating member for receiving an external force from the first direction and the second direction, passing through the oblique groove portion of the first guide groove, and the direction in which the oblique groove portion is formed. And a virtual straight line in the same direction, and an action portion disposed in a region between the virtual straight line in the same direction as the direction in which the diagonal groove portion is formed, passing through the diagonal groove portion of the second guide groove. Conveying device to do.   The said action part is a surface which passes through the said diagonal groove part, and is substantially orthogonal to the virtual straight line of the same direction as the direction in which the said diagonal groove part was formed, The Claim 1 thru | or 4 characterized by the above-mentioned. The sheet conveying apparatus according to the description.   The sheet conveying apparatus according to claim 1, wherein the operation member is a member that is long in the same direction as the first direction. A first continuous groove portion that is continuous with one side of the oblique groove portion and formed in a direction parallel to the conveying direction, and a continuous portion that is continuous with the other side of the oblique groove portion and formed in a direction parallel to the conveying direction. it has been the second sheet conveying device according to any one of claims 1 to 3, characterized in that it has a continuous groove.   The sheet conveying device according to claim 7, wherein a length of the oblique groove is longer than a length of the first continuous groove and the second continuous groove.   The first continuous groove portion and the second continuous groove portion have protrusions that apply a load to the relative movement between the first continuous groove portion and the fitting member fitted into the second continuous groove portion. 9. The sheet conveying device according to claim 8, wherein the sheet conveying device is formed.   The sheet conveying apparatus according to any one of claims 1 to 9, wherein the operation member is engaged with a conveyance guide member so as to be movable in the conveyance direction.   11. The sheet conveying apparatus according to claim 1, wherein the conveying guide member is engaged with a fixed fixing member so as to be movable in the width direction. 11.   12. The sheet conveying apparatus according to claim 1, wherein the conveying guide member has a U-shaped cross-sectional guide portion with which a side edge of the sheet abuts. In an image forming apparatus that forms an image on a sheet conveyed by a sheet conveying apparatus,
An image forming apparatus comprising the sheet conveying apparatus according to claim 1 as the sheet conveying apparatus. The image forming apparatus has a re-conveying path for conveying the sheet image-formed on the first surface in the image forming unit to the image forming unit again,
The image forming apparatus according to claim 13, wherein the sheet conveying device is provided in the re-conveying path.

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