JPH11268849A - Sheet processing device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of the collision sound of a sheet conveying means by releasing a sheet for a sheet conveying means engaged with the sheet without releasing a sheet for a sheet conveying means engaged with no sheet, then making the position adjustment of the sheet. SOLUTION: The size of a sheet is judged, a conveyance roller 9 is rotated until the rear end of the sheet leaves an inversion roller 8 for the sheet judged as short in length in the conveying direction, and the sheet is released with the D-cut section of the conveyance roller 9 located below. A lateral registration adjustment is made in this state, the conveyance roller 9 is rotated after the lateral registration adjustment to convey the sheet to the downstream side. When a sheet is judged to be longer than the prescribed length, pressures of both the conveyance roller 9 and the inversion roller 8 are released to release the sheet. A lateral registration adjustment is made in this state, and the conveyance roller 9 is rotated after the lateral registration adjustment to convey the sheet to the downstream side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sheet material processing apparatus capable of adjusting the position of a sheet material in a sheet material conveyance path, and an image forming apparatus provided with the sheet material processing apparatus.

[0002]

2. Description of the Related Art Some image forming apparatuses, such as printers, copiers, and facsimile machines, release the pressure of a roller during lateral registration control of a sheet material on which printing on one side is completed when printing on the second side. Some have a mechanism for freeing the sheet material. In recent years, this has become an essential configuration for printing sheet materials of various sizes.

FIG. 2 shows an overall configuration of a conventional laser beam printer having a sheet material pressure releasing mechanism as an example.

At the bottom of the printer body M, a sheet cassette K containing a large number of sheet materials S is removably mounted in one or more stages (two in this figure).

Reference numeral 1 denotes a paper feed roller, and reference numeral 2 denotes a roller 2.
Reference numeral 3 denotes a registration roller pair, reference numeral 4 denotes a photosensitive drum, reference numeral 5 denotes a transfer roller, and reference numeral 6 denotes a fixing roller pair.

Reference numeral 7 denotes a pair of transport rollers, and reference numeral 8 denotes a transport roller which can be rotated forward and backward in a vertical transport path (hereinafter, referred to as a transport roller).
Reference numeral 8a denotes a driven roller that presses against the reversing roller 8 held by the guide 21, reference numeral 9 denotes a conveyance roller having a half-moon shape, reference numeral 9a denotes a driven roller that presses against the half-moon roller, and reference numeral 10 denotes a curl. This is a pair of conveying rollers having a removing function (hereinafter referred to as a curl removing roller).

Reference numeral 11 denotes a conveying roller pair, reference numeral 12 denotes a scanner, and reference numeral 13 denotes a folding mirror. Light beams scanned by the scanner 12 are guided to the photosensitive drum 4 via the mirror 13. .

Reference numeral 14 denotes a sheet discharge tray, reference numeral 15 denotes a flapper for switching a sheet material conveyance direction, reference numeral 16 denotes a sheet material discharge roller, and reference numeral 34 denotes a sheet material guide which also serves as an exterior.

As shown in FIG. 13, the sheet material guide 34 is opened about a rotation shaft 34a.

Next, the printing operation of the laser beam printer will be described.

In FIG. 2, a sheet material S fed from a sheet feeding cassette K by a sheet feeding roller 1
And the roller 2 b, and further conveyed to the registration roller pair 3. Then, the sheet is conveyed by the registration roller pair 3 at the same timing as the photosensitive drum 4, and an image on the photosensitive drum 4 is transferred by a known electrophotographic process.

Thereafter, the sheet material S is sent to the fixing roller pair 6, where the image is fixed, and then guided to the flapper 15 by the conveying roller pair 7.

When printing on both sides of the sheet material S, the sheet material S on which printing on the first surface has been completed proceeds in the direction of the arrow (indicated by A1 in the figure) by the flapper 15 in the posture shown by the broken line, and , Driven roller 8a.

FIG. 3 is a detailed view showing how the sheet material S is conveyed in the vicinity of the reversing roller 8 and the driven roller 8a.

Continuing the description with reference to FIG. 3, the leading end of the sheet material S transported from the direction of arrow A1 reaches the known sheet material detecting means 17. Here, when the sheet material detecting means 17 detects the leading end of the sheet material S, the reversing roller 8 and the driven roller 8a rotate in the direction of the solid line arrow A2,
The sheet material S is conveyed until the rear end thereof is detected by the sheet material detecting means 17.

Returning to FIG. 2, the sheet S conveyed in the direction indicated by the solid arrow A1 by the reversing roller 8 and the driven roller 8a is guided to the vertical conveying path 33 and
Is conveyed until it is detected by the sheet material detecting means 17.

Returning to FIG. 3, if the sheet material S is conveyed by a predetermined amount after detecting the rear end thereof, the branch point 1
Assuming that the rear end of the sheet material S has come off, 8 rotates in the reverse direction in the direction of the dashed arrow.

Here, since the nip direction of the reversing roller 8 is oriented in a new direction indicated by the dashed arrow A3, the sheet material S
When the rear end passes through the branch point 18 and the reversal starts, the leading end of the sheet material S (the rear end before the reversal) is conveyed in the direction of arrow A3.

FIG. 4A shows a driven roller 8a driven by a reversing roller 8.
FIG. 4B shows a state in which the driven roller 8 a is not pressed against the reverse roller 8. 4A, the guide 21 can swing about the shaft 21a.

The driven roller 8a held by the guide 21 is pressed against the reversing roller 8 by the spring 22 with the center 21a as the swing center.

Returning to FIG. 3, if the description is continued, the reversing roller 8 is reversed and the sheet material S conveyed in the direction of arrow A3 is
It is guided to the transport roller 9 through the space between the guide 9 and the guide 20.

The transport roller 9 is normally stopped with its D-cut portion facing downward by means of a rotational direction position detecting means (not shown).

The transport roller 9 makes one rotation at the timing when the sheet material S approaches, and comes into pressure contact with the driven roller 9a to make the sheet material S
And stop again with the D-cut section down.

FIG. 5 is a perspective view showing a transport path near the transport roller 9. As shown in FIG. 5, a guide 19 for guiding to the transport roller 9 has a U-shape, and has a pair of 19a and 19b with the transport roller 9 interposed therebetween. Hereinafter, guide 19 (19
a, 19b) is called a horizontal resist plate.

FIG. 6 is a top view showing a transport route near the half-moon-shaped roller 8. Continuing the description with reference to FIG.
U (not shown) receives a detection signal from the sheet material detection means 17. Based on these detection signals, the CPU determines, based on these detection signals, the transport roller 9 and the horizontal registration plate 19.
(A) and 19 (b) are controlled.

When the sheet material S is reversed by the reversing roller 8 and enters the U-shape of the lateral resist plates 19 (a) and 19 (b), each lateral resist plate is located at a position wider than the width of the sheet material S. After that, the horizontal resist plates 19 (a), 19
(B) moves to a reference position different depending on the sheet material size in a direction of an arrow orthogonal to the sheet material conveyance direction,
The horizontal resist of the sheet material S in the horizontal resist plates 19 (a) and 19 (b) is adjusted.

FIG. 7 (a) shows that the sheet material S is
And the horizontal resist plates 19 (a), 19 (b)
5 shows a state in which the horizontal resist plate is in a position wider than the sheet material S. From this state, the horizontal resist plates 19 (a) and 19 (b) sandwich the sheet material S from the direction indicated by the arrow as described above, and adjust the horizontal resist as shown in FIG. 7 (b).

Returning to FIG. 3, the description will be continued.
After stopping with the D-cut portion down, the horizontal resist is adjusted by the horizontal resist plates 19 (a) and 19 (b) described above.

Here, since the transport roller 9 has the D-cut portion at the bottom, the transport roller 9 is stopped with a gap not pressed against the driven roller 9a. Therefore, the sheet material S is not sandwiched.

Further, the reversing roller 8 and the driven roller 8a on the upstream side also release the nip as shown in FIG. 4 (b) to completely free the sheet material S and adjust the lateral registration.
In this way, the horizontal resist is often adjusted after the sheet material is free from being sandwiched.

FIG. 8 shows a guide 2 swinging about a shaft 21a.
FIG. 3 is a detailed view for explaining a pressure release mechanism of FIG.

In FIG. 8, reference numeral 23 denotes a known suction solenoid, and reference numeral 24 denotes an actuator which rotates about a shaft 24a.

When the suction solenoid 23 is pulled in the direction of arrow A4, the actuator 24 rotates the pressing portion 24b in the direction of arrow A5 and pushes the projection 21b of the guide 21 to swing the guide 21 about the shaft 21a. In this way, the nip of the driven roller 8a is released as shown in FIG.

Returning to FIG. 3, a supplementary explanation will be given. After the conveyance roller 9 is stopped with the D-cut portion down, the nip of the reversing roller 8 and the driven roller 8a is released, and the roller is completely free. Lateral resist plates 19 (a), 19 (b)
To adjust the lateral resist.

After the completion of the lateral registration adjustment, the reversing roller 8 and the driven roller 8a are pressed again by the spring 22 when the suction solenoid 23 is released. Then, the transport rollers 9,
The driven roller 9a, the reversing roller 8, and the driven roller 8a rotate.

Returning to FIG. 2, when the horizontal registration adjustment is completed, the sheet material S conveyed by the reversing roller 8, the driven roller 8a, and the conveying rollers 9, 9a is curled by the curl removing roller 10, the conveying roller 2, and the roller 2. The sheet material S, which is guided to the nip of 2a and further to the nip of the conveying roller 2 and the roller 2b, is sent to the registration roller pair 3 with the second surface facing up.

The sheet material S sent to the registration roller pair 3
Is printed on the second side in the same manner as in the case of the first side.

The sheet material S having been printed on the second surface is guided upward by the flapper 15 in the position shown by the solid line in the figure, and is discharged onto the sheet discharge tray 14 by the sheet discharge rollers 16.

[0039]

However, in the above conventional example, the pair of reversing rollers 8
And a driven roller 8a, and a pressure release mechanism is provided.
At this time, the roller pressing force against the reversing roller 8 is set strong because the sheet material S may slide down during the reversing and fall down.

Therefore, when the suction solenoid 23 is released after the pressure is released, the reversing roller 8 and the driven roller 8a again come into pressure contact with the strongly set spring 22, so that a collision noise is generated.

When the sheet material is small-size paper, the number of prints per minute (hereinafter referred to as throughput) naturally increases, so that the number of horizontal registrations per time also increases, and the collision sound at the time of pressure release is even more annoying. Had become.

Further, when the sheet material S remains in the apparatus while the sheet material S is bitten by the reversing roller 8 and the operator opens the cover 34 to perform the sheet material removing process, the nip between the reversing roller 8 and the driven roller 8a is removed. If the sheet material S falls below the vertical transport path 33,
Work to take it out was necessary, and improvement in operability was desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to prevent or reduce a collision noise generated when adjusting the registration of a sheet material during conveyance. Another object of the present invention is to provide a sheet material processing apparatus and an image forming apparatus capable of preventing a drop when processing a sheet material on a vertical conveyance path and improving operability.

[0044]

In order to achieve the above object, according to the present invention, at least two sheet conveying means and a sheet conveying means are provided on a conveying path for conveying the sheet. And a position adjusting means for adjusting the position of the sheet material in the width direction, wherein the sheet material transporting means adjusts the position of the sheet material by the position adjusting means. Release means for releasing the sheet material, operating the release means with respect to the sheet material conveyance means with which the sheet material is engaged to release the sheet material, and releasing the sheet material with the sheet material without engagement. On the other hand, the position of the sheet material is adjusted by the position adjusting means without releasing the sheet material by the releasing means.

On the transport path for transporting the sheet material, 3
In a sheet material processing apparatus provided with two sheet material conveying means and a position adjusting means for adjusting a width direction position of the sheet material conveyed by the sheet material conveying means, two sheet material conveying means on the upstream side in the conveying direction. The release means for releasing the sheet material to enable the position adjustment of the sheet material by the position adjustment means, for a sheet material shorter than the transport distance between the sheet material transport means at both ends in the transport direction, The sheet material is stopped without being engaged with the sheet material conveyance means at both ends in the conveyance direction, and the release means is operated to release the sheet material with respect to the sheet material conveyance means at the center in the conveyance direction in which the sheet material is engaged. The position of the sheet material is adjusted by the position adjusting means.

The sheet conveying means is preferably a pair of rollers for nipping and conveying the sheet.

It is also preferable that the position adjusting means moves in a width direction substantially orthogonal to the sheet conveying direction to bias the end of the sheet.

It is also preferable that the transport path has a vertical transport path oriented substantially in the vertical direction, and that at least the sheet material transport means on the upstream side in the transport direction is arranged in the vertical transport path.

In a sheet material processing apparatus provided with a transport path for transporting a sheet material formed between opposed guide members, at least one of the guide members can be opened and closed to release the transport path. And a locking means for projecting into the transport path and locking a sheet material in the transport path with the opening operation of the one guide member.

[0050] It is also preferable that the one guide member has a pivot shaft, and the locking means is a sheet guide having elasticity attached near the pivot shaft of the one guide member.

It is preferable that the guide member is formed as the same member or the same unit as the exterior member.

The transport path is a vertical transport path oriented substantially in the vertical direction, and it is preferable that the transport path is provided with sheet material transport means for sandwiching and transporting the sheet material by transport members disposed on the respective opposing guide members. is there.

The image forming apparatus further comprises an image forming means for forming an image on the sheet conveyed by the above-described sheet material processing apparatus.

[0054]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) Embodiment 1 is characterized by a control method relating to the release of the pressure of the sheet material accompanying the lateral registration control of the laser beam printer (image forming apparatus) in the prior art described above as the sheet material processing apparatus. is there.

Therefore, in describing the characteristic operation of the lateral registration control according to the present invention, the mechanical configuration can adopt the configuration of a conventional laser beam printer, and the present invention is implemented by the same configuration. explain.

However, the sheet material processing apparatus is not limited to a laser beam printer, but may be any other apparatus for processing other sheet materials, for example, a facsimile machine or a copying machine which forms an image on a sheet material, or a sheet. The present invention can be applied to a sorter device or the like that does not involve image formation on a material.

FIG. 12 shows the overall configuration of a laser beam printer according to the present invention. In FIG. 12, reference numeral 35 denotes an elastic member as locking means provided on the sheet material guide 34 made of the same component as the exterior cover.

In addition, the same components as those of the conventional laser beam printer are denoted by the same reference numerals, and description thereof is omitted because it can be understood from the description of the prior art.

The characteristic printing operation of the laser beam printer according to the present invention will be described with reference to FIG. Here, the case where the sheet material S1 and the sheet material S2 whose transport direction length is shorter than the transport distance from the nip of the reversing roller 8 and the driven roller 8a to the nip of the curling roller pair 10 will be described separately.

1) When printing a sheet material S1 having a short length in the transport direction.

In FIG. 12, the sheet material S1 stored in the cassette K is fed by the paper feed roller 1, passes through the photosensitive drum 4 and the fixing roller pair 6, and prints on the first side of the sheet material S1 as in the conventional example. Perform Then, in order to perform printing on the second side, the sheet is conveyed in the direction of arrow A6 by the flapper 15 and guided to the reversing roller 8 and the driven roller 8a.

FIG. 3 is also a detailed view showing the vicinity of the reversing roller 8 in the present invention.

The guide member 21 can be swung about a shaft 21a by a driving means (not shown) by a signal from the CPU.

Further, the CPU includes a sheet material detecting means 1
7 receives a detection signal from the CPU.
Controls the transport roller 9 and the horizontal registration plates 19 (a) and 19 (b) based on these detection signals.

Continuing the description with reference to FIG. 3, the leading end of the sheet material S1 conveyed from the direction of arrow A3 reaches the sheet material detecting means 17. Here, when the sheet material detecting means 17 detects the leading end of the sheet material S1, the reversing roller 8 and the driven roller 8a rotate in the direction of the solid line arrow, and convey until the rear end of the sheet material S1 is detected by the sheet material detecting means 17. I do.

Continuing the description with reference to FIG. 12, the sheet material S1 conveyed in the direction of the arrow A6 by the reversing roller 8 and the driven roller 8a is guided to the vertical conveyance path 33,
The sheet 1 is conveyed until the trailing end is detected by the sheet material detecting means 17.

FIG. 14 is a detailed view showing a state in which the sheet material S1 is conveyed around the shaft 34a, which is the center of swing of the sheet material guide 34 also serving as an exterior cover.

Continuing the description with reference to FIG. 14, the sheet material S1 conveyed by the reversing roller 8 and the driven roller 8a is conveyed while being guided by the elastic member 35 in the vertical conveying path 33.

Returning to FIG. 3, if the rear end of the sheet material S1 is detected and conveyed by a predetermined amount, the sheet material S1 is reversely rotated in the direction of the dashed arrow A7, assuming that the rear end of the sheet material S1 has fallen off.

Here, since the nip direction of the reversing roller 8 and the driven roller 8a is oriented in a new direction indicated by the dashed arrow A3, the reversal starts after the rear end of the sheet material S1 has passed through the branch point 18. The tip of the sheet material S1 (the reverse side is
The rear end) is transported in the direction of arrow A3.

The reversing roller 8 and the driven roller 8a are reversed and the sheet material S1 conveyed in the direction of the arrow A3 is moved to the horizontal registration plate 19.
(A), 19 (b) and the guide 20 are guided to the transport roller 9.

The transport roller 9 is normally stopped with its D-cut portion facing downward by means of a rotational direction position detecting means (not shown).

Continuing the description with reference to FIG. 12, the conveying roller 9 receives a signal from the CPU, makes one or two rotations at the timing when the sheet material S1 approaches, and presses against the driven roller 9a to press the sheet material S1. The sheet S1 is conveyed, the rear end of the sheet S1 passes through the nip of the reversing roller 8 and the driven roller 8a, and stops again with the D cut portion down before the front end reaches the nip of the curl removing roller 10.

From this state, the horizontal resist plates 19 (a), 1
In FIG. 9B, as in the conventional example, the sheet material S is sandwiched from the width direction of the sheet material S1, and the horizontal resist is adjusted as shown in FIG. 7B.

Here, after the transport roller 9 is stopped with the D-cut portion down, the horizontal registration plates 19 (a),
Since the horizontal registration is adjusted according to 9 (b), the sheet material S
1 is in a free state without being pinched. Further, the reversing roller 8 and the driven roller 8a remain in a state where a nip is formed.

Referring back to FIG. 12, the sheet material S1 for which the lateral registration adjustment has been completed is transported by the transport roller 9, the driven roller 9a and the curl removing roller 10 to the transport roller 2,
The sheet is guided to the nip of the roller 2a, further guided to the nip of the transport roller 2 and the roller 2b, turned to the second surface, and sent to the registration roller pair 3.

The sheet material S sent to the registration roller pair 3
1 is printed on the second surface in the same manner as in the case of the first surface described above.

The sheet material S1 having been printed on the second surface is discharged onto the tray 14 by the discharge roller pair 16 by the flapper 15 in the position shown by the solid line in FIG.

The length of the sheet material S1 can be detected by detecting the size of the sheet material placed in the cassette K in advance by the laser printer main body, or by the sheet material detecting means as described above. It is possible to adopt a method of detecting the sheet material 17 based on the detection time of the sheet material being conveyed at a predetermined speed.

2) When printing a sheet material S2 having a long length in the transport direction.

In FIG. 12, the sheet material S2 accommodated in the cassette K is fed by the paper feed roller 1, passes through the photosensitive drum 4 and the fixing roller pair 6, and prints the first surface on the sheet material S1 as in the conventional example. Perform Then, in order to perform printing on the second side, the sheet is conveyed in the direction of arrow A1 by the flapper 15 and guided to the pair of reversing rollers.

Continuing the description with reference to FIG. 3, the leading end of the sheet material S2 conveyed from the direction of arrow A1 reaches the sheet material detecting means 17. Here, when the sheet material detecting means 17 detects the leading end of the sheet material S2, the reversing roller 8 and the driven roller 8a rotate in the direction of the solid arrow, and are conveyed until the rear end of the sheet material S2 is detected by the sheet material detecting means 17. I do.

12, the sheet material S2 conveyed in the direction of arrow A6 by the reversing roller 8 and the driven roller 8a is guided to the vertical conveyance path 33, and
Is conveyed until the trailing edge of the sheet is detected by the sheet material detecting means.

14, the sheet material S2 conveyed by the reversing roller 8 and the driven roller 8a is conveyed while being guided by the elastic member 35 in the vertical conveying path 33.

Returning to FIG. 3, the explanation will be continued.
When the rear end of the sheet material S2 is detected and conveyed by a predetermined amount, the sheet member S2 is reversely rotated in the direction indicated by the dashed arrow, assuming that the rear end of the sheet material S2 has fallen off.

Here, the nip direction of the reversing rollers 8 and 8a is oriented in a new direction indicated by the arrow A3, so that the rear end of the sheet material S2 passes through the branch point 18, and when the reversal starts, the leading end of the sheet material S2 becomes , In the direction of arrow A3.

Continuing the description, the reversing roller 8 and the driven roller 8
The sheet material S <b> 2 that has been inverted and conveyed in the direction of the arrow A <b> 3 is guided to the conveyance roller 9 through the space between the horizontal registration plates 19 (a) and 19 (b) and the guide 20.

The transport roller 9 is normally stopped with the D-cut portion facing down.

Continuing the description with reference to FIG. 12, the conveyance roller 9 receives the signal from the CPU, makes one or two rotations at the timing when the sheet material S2 approaches, and presses against the driven roller 9a to press the sheet material S2. The sheet is conveyed and stopped again with the D-cut portion down before the leading end reaches the nip of the curl removing roller 10.

From this state, the horizontal resist plates 19 (a), 1
9B, as in the conventional example, the sheet material S is sandwiched from the width direction of the sheet material S2, and the horizontal resist is adjusted as shown in FIG. 7B.

Here, after the transport roller 9 is stopped with the D cut portion down, the horizontal registration plates 19 (a), 1
Since the horizontal registration is adjusted by 9 (b), the sheet material S2 is set in a free state in which the sheet material S2 is not sandwiched, and further, the reversing roller 8 and the driven roller 8a are released from the pressure as in the conventional example, and the sheet material S2 is released (released). ).

Returning to FIG. 12, the sheet material S1 for which the lateral registration adjustment has been completed is transported by the transport roller 9, the driven roller 9a and the curl removing roller 10 to the transport roller 2,
The sheet is guided to the nip of the roller 2a, further guided to the nip of the transport roller 2 and the roller 2b, turned to the second surface, and sent to the registration roller pair 3.

The sheet material S sent to the registration roller pair 3
No. 2 is printed on the second surface in the same manner as in the case of the first surface described above.

The sheet material S2 having been printed on the second surface is discharged onto the tray 14 by the discharge roller pair 16 by the flapper 15 in the position shown by the solid line in FIG.

FIG. 1 is a control sequence diagram of the characteristic operation control according to the present invention. In FIG. 1, in a sequence 101 (hereinafter referred to as S101), the leading end of the sheet material is detected by the sheet material detecting means 17 (the sensor 17 in FIG. 1), and the reversing roller 8 is rotated forward (S10).
2).

After the sensor 17 detects that the sheet material has come off (S103), the reversing roller 8 is rotated reversely after a predetermined pulse (time) (S104).

In S105, the size of the sheet material is determined. If the length of the sheet material in the transport direction is determined to be short, S1 is determined.
At 06, the conveying roller 9 (described as a half-moon shaped roller in FIG. 1) is rotated until the rear end of the sheet material passes through the reversing roller 8, and the sheet material is released with the D-cut portion of the conveying roller 9 down.

In this state, horizontal registration adjustment is performed (S1).
07), after the horizontal registration adjustment, the conveying roller 9 is rotated to convey the sheet material to the downstream side (S108).

If it is determined in S105 that the sheet material is longer than the predetermined length, the conveying roller 9 and the reversing roller 8
Is released to release the sheet material (S10).
9, S110), horizontal registration adjustment is performed in that state (S111), and after the horizontal registration adjustment, the conveying roller 9 is rotated to convey the sheet material to the downstream side (S112).

Next, a state in which the sheet material S1 or S2 remains bitten by the reversing roller 8 and the driven roller 8a,
That is, an operation of removing the residual paper (sheet material S1 or S2) from the vertical transport path 33 will be described.

In FIG. 12, the cover 34 is removed by opening the cover 34 in the same manner as in the prior art, in order to remove the remaining paper bitten by the reversing rollers 8 and 8a.

FIG. 15 is a detailed view showing the vicinity of the hinge portion 34a when the cover 34 according to the present invention is opened.

Continuing the description with reference to FIG.
By opening 4, the elastic member 35 sandwiches the sheet material.

According to the present embodiment, the following effects can be obtained.

In the related art, since the short sheet material size S1 has a large throughput, it is necessary to release the pressure of the reversing roller many times per minute during the horizontal registration adjustment. However, in the present embodiment, both sides of the short sheet material size S1 have to be released. Since the pressure of the reversing rollers 8 and 8a is not released at the time of the horizontal registration adjustment at the time of printing, a collision sound at the time of pressing is not generated.

In the case of the long sheet material size S2, the number of horizontal registration adjustments per minute is small, so that a collision sound is less generated and noise is hardly generated. Therefore, the print operator is not bothered by noise.

In addition, when the reversing roller 8 and the driven roller 8a have residual paper that has been bitten and is to be removed, the cover 3 may be removed.
4, the residual paper is pressed by the elastic member 35, so that the sheet material does not fall below the vertical conveyance path 33 even if the print operator erroneously releases the pressure of the pair of reversing rollers manually. Operability such as processing can be improved.

(Embodiment 2) Between the nip of the reversing roller 8 and the driven roller 8a shown in the embodiment 1 to the nip of the curl removing roller pair 10, a general A4 sheet generally used in offices as a sheet material is used. LTR, B5, EXE, A5
By allowing the standard paper of the size to be inserted, it is not necessary to release the pressure when performing the lateral registration adjustment of the sheet material of the above size, and it is possible to prevent the generation of a collision sound and obtain a more substantial effect. .

(Embodiment 3) FIG. 9 shows a third embodiment of the present invention.

In the figure, reference numeral 19 denotes a sheet material S from the width direction.
A lateral registration plate (side guides abutting on the end surface of the sheet material S is not shown) that allows the lateral registration to be adjusted by sandwiching the sheet material, 27 is a sheet material transport roller pair, and 25 and 26 are sheet material transport roller pairs to release pressure. It has a mechanism.

In the transport path for releasing the pressure of the transport roller pair which transports the sheet material S in only one direction, when the sheet material is straddling the transport means when adjusting the width direction position of the sheet material, The same effect can be obtained by opening the sheet conveying roller pair that is in contact with the sheet material and adjusting the position in the width direction with the sheet material conveying roller pair that is not in contact.

(Embodiment 4) FIG. 10 shows a fourth embodiment of the present invention.
An embodiment will be described.

In the figure, reference numeral 32 denotes a pair of conveying rollers.
Each of the conveying roller pairs 8 to 32 includes a pressure releasing unit.

As described above, when adjusting the position in the width direction of the sheet material conveyed over a plurality of rollers, the pressure is released only for the conveying roller pair that is in contact, and the other conveying means are left as they are. By doing so, the collision sound can be reduced.

(Embodiment 5) FIG. 16 shows a fifth embodiment of the present invention.
An embodiment will be described. In the figure, reference numeral 36 denotes a projection provided near the fulcrum as a locking means.

As described above, in conjunction with the opening of the guide 34, the protrusion 36 enters the notched conveyance guide 37, abuts on the sheet material S, and is pressed down using the strainer. S can be held without dropping, and operability when processing the sheet material can be improved.

[0118]

As described in the embodiment of the present invention, when adjusting the position of the conveyed sheet in the width direction, the sheet is released from the sheet conveying means with which the sheet is engaged. Since the means is operated, it is possible to prevent the occurrence of collision noise of the sheet material conveying means that does not require the sheet material releasing operation, and it is possible to provide a device with less noise.

Further, the sheet material having a short length is conveyed and stopped so as to be engaged with only one sheet material conveying means in the central portion, and the release means for only the sheet material conveying means is operated. Noise when processing frequently used sheet materials can be reduced.

When the guide member forming the transport path is opened, a locking means for locking the sheet material on the transport path is provided, so that the sheet material on the transport path can be processed (jam removal, etc.). Can be prevented, and operability can be improved. This configuration is particularly preferably applied to a vertical conveyance path, in which case it is possible to prevent the sheet material from falling.

[Brief description of the drawings]

FIG. 1 is a view for explaining a control sequence of operation control of an apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a cross-sectional configuration of the image forming apparatus.

FIG. 3 is a detailed view of the vicinity of a transport path according to the first embodiment of the present invention and a conventional image forming apparatus.

FIG. 4 is a detailed diagram of a pressure releasing operation of the image forming apparatus according to the first embodiment and the conventional image forming apparatus.

FIG. 5 is a perspective view of a lateral registration unit of the first embodiment of the present invention and a conventional image forming apparatus.

FIG. 6 is a top view of a lateral registration unit of the first embodiment of the present invention and the conventional image forming apparatus.

FIG. 7 is an explanatory diagram of an operation of the horizontal resist plate of the image forming apparatus according to the first embodiment of the present invention and the conventional image forming apparatus.

FIG. 8 is a detailed view of a pressure release mechanism of the image forming apparatus according to the first embodiment of the present invention and a conventional image forming apparatus.

FIG. 9 is a detailed view of a conveyance path according to the image forming apparatus according to the third embodiment of the present invention.

FIG. 10 is a detailed view of a conveyance path according to an image forming apparatus according to a fourth embodiment of the present invention.

FIG. 11 is an explanatory diagram of a cross-sectional configuration related to an image forming apparatus according to the related art.

FIG. 12 is a sectional configuration explanatory diagram related to the image forming apparatus according to the first embodiment of the present invention;

FIG. 13 is an explanatory diagram of a cross-sectional configuration related to a conventional image forming apparatus.

FIG. 14 is a cross-sectional configuration diagram near a guide member of a transport path according to the image forming apparatus according to the first embodiment of the present invention.

FIG. 15 is a cross-sectional configuration diagram of the vicinity of a guide member on a conveyance path when removing a sheet material according to the image forming apparatus according to the first embodiment of the present invention;

FIG. 16 is a cross-sectional configuration diagram of the vicinity of a guide member on a conveyance path when removing a sheet material according to the image forming apparatus of the fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 8 reverse roller 8a driven roller 9 transport roller 9b driven roller 10 transport roller pair 17 sheet material detecting means 19, 19a, 19b lateral resist plate 21 guide 22 spring 34 cover 34a hinge part 35 elastic member (locking means) S, s1, S2 sheet material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G03G 15/00 518 G03G 15/00 518

Claims (10)

[Claims] 1. A conveying path for conveying a sheet material,
In a sheet material processing apparatus comprising: at least two sheet material conveying means; and a position adjusting means for adjusting a position in a width direction of the sheet material conveyed by the sheet material conveying means, wherein the sheet material conveying means has the position Release means for releasing the sheet material in order to enable adjustment of the position of the sheet material by the adjusting means, and actuating the release means with respect to the sheet material conveyance means with which the sheet material is engaged, to release the sheet material The sheet adjusting means adjusts the position of the sheet material by the position adjusting means without releasing the sheet material by the releasing means for the sheet material conveying means which is released and the sheet material is not engaged. Material processing equipment. 2. A transport path for transporting a sheet material,
In a sheet material processing apparatus including three sheet material conveying means and a position adjusting means for adjusting a width direction position of a sheet material conveyed by the sheet material conveying means, two sheet material conveyance members on the upstream side in the conveying direction are provided. The means comprises release means for releasing the sheet material in order to enable the position adjustment of the sheet material by the position adjusting means, and for a sheet material shorter than the transport distance between the sheet material transport means at both ends in the transport direction. The sheet material is stopped without being engaged with the sheet material transport means at both ends in the transport direction, and the release means is operated with respect to the sheet material transport means at the central portion in the transport direction in which the sheet material is engaged, to release the sheet material. A sheet material processing apparatus, wherein the apparatus is released and the position of the sheet material is adjusted by the position adjusting means. 3. The sheet material processing apparatus according to claim 1, wherein the sheet material conveying means is a pair of rollers for nipping and conveying the sheet material. 4. The sheet adjusting device according to claim 1, wherein the position adjusting unit moves in a width direction substantially orthogonal to a conveying direction of the sheet material to urge the end of the sheet material. 3. The sheet material processing apparatus according to 1. 5. The apparatus according to claim 1, wherein the transport path has a vertical transport path oriented in a substantially vertical direction, and at least a sheet material transport unit on the upstream side in the transport direction is disposed in the vertical transport path. The sheet material processing apparatus according to any one of claims 1 to 4. 6. A sheet material processing apparatus having a transport path for transporting a sheet material formed between opposed guide members, wherein at least one of the guide members is openable and closable to release the transport path. A sheet processing apparatus comprising: a locking unit that protrudes into the transport path and locks a sheet material in the transport path in accordance with an opening operation of the one guide member. 7. The apparatus according to claim 1, wherein the one guide member has a pivot shaft, and the locking means is an elastic sheet guide attached near the pivot shaft of the one guide member. Item 7. A sheet material processing apparatus according to Item 6. 8. The sheet material processing apparatus according to claim 6, wherein the guide member is configured as the same member or the same unit as the exterior member. 9. The image forming apparatus according to claim 1, wherein the conveying path is a vertical conveying path oriented substantially in a vertical direction, and includes a sheet material conveying unit that sandwiches and conveys the sheet material by a conveying member disposed on each of the opposed guide members. The sheet material processing apparatus according to any one of claims 6 to 8, wherein: 10. An image forming apparatus, comprising: an image forming unit configured to form an image on a sheet material conveyed by the sheet material processing apparatus according to claim 1. Description: