JPH1111787A - Sheet post processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively eliminate the sheet jam by loading the sheet to be fed from an auxiliary tray when a transfer means to transfer the sheet in the direction orthogonal to the sheet carrying direction transfer the sheet bundle and is returned to the original position on its upper surface, and returning it to the prescribed position. SOLUTION: When a first holding means 7 delivers the sheet bundle S' to a second holding means 10 and is returned to the original position, and an auxiliary tray 13 drops the sheet S on a lower treatment tray 4 side, the sheet S is loaded on the holding means 7 and detached from accumulation trays 9A, 9B side. An upper part 41 of the first sheet holding means 7 is flat, a member 41a such as a rubber sheet of high coefficient of friction is attached thereto to positively detach the sheet S from the accumulation trays 9A, 9B. After the sheet S' is delivered to the second holding means 10, the sheet S is prevented from being pulled in the same direction. Generation of jam and turn-over of the sheet S can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet post-processing apparatus for performing post-processing such as stapling or punching of an image-formed sheet conveyed from an image forming apparatus such as a copying machine, a facsimile or a printer. .

[0002]

2. Description of the Related Art In such a sheet post-processing apparatus, a predetermined number of sheets conveyed from an image processing apparatus are stacked, aligned, and post-processed such as stapling. Processing tray)
The sheet bundle after the post-processing is temporarily stocked on the sheet stacking tray (hereinafter, referred to as a sheet stacking tray) provided separately from the processing tray.
(Hereinafter simply referred to as “stacking tray”).

In such a sheet post-processing apparatus,
An auxiliary tray for temporarily receiving a sheet conveyed from the image forming apparatus located above the processing tray and transferring it to a lower processing tray at a predetermined timing may be used together. The role of such an auxiliary tray eliminates the need to control the movement of the processing tray in the up and down direction, and the leading edge of the sheets successively conveyed from the image forming apparatus is used to remove the sheets already stacked on the processing tray. An object of the present invention is to prevent a situation in which a sheet aligned on a processing tray is disturbed by pushing the sheet in a conveying direction.

[0004] The auxiliary tray plays a greater role in that a predetermined number of sheet bundles placed on the processing tray, which are stacked on the processing tray in an aligned state and are post-processed, are placed in a sheet conveying direction from the image forming apparatus. An object of the present invention is to prevent a sheet jam or turning over caused by a sheet sent from an image forming apparatus being drawn in a sheet bundle transfer direction when the sheet is transferred to the stacking tray arranged in a direction orthogonal to the sheet stack.

[0005]

The above-mentioned auxiliary tray is used to eliminate such a problem. However, as the performance of the image forming apparatus is improved daily and the speed is further increased. Accordingly, a post-processing apparatus for post-processing a sheet conveyed from an image forming apparatus has also been required to have a high speed.

For this reason, it is necessary for the auxiliary tray to temporarily receive the sheet sent from the image forming apparatus at least while the transfer means is moving the post-processed sheet bundle to the stacking tray side. However, if the auxiliary tray must continue to hold the sheet conveyed from the image forming apparatus side even during a period until the transfer means returns to the original predetermined position after the transfer of the sheet bundle, the post-processing apparatus Cannot respond to an image forming apparatus that sends out a sheet at a high speed.

[0007]

SUMMARY OF THE INVENTION A sheet processing apparatus according to the present invention solves the above-mentioned problems, and further utilizes a return operation of the above-mentioned transfer means after the transfer of a sheet bundle, thereby reducing a sheet jam. It is configured as follows so that it is positively excluded.

That is, a plurality of sheets conveyed from the image forming apparatus are stacked on a sheet processing tray with their end surfaces aligned, and the aligned bundle of sheets is subjected to post-processing such as stapling. In the sheet post-processing apparatus, the sheet post-processing apparatus temporarily receives a sheet conveyed from the image forming apparatus located above the sheet processing tray and the sheet processing tray, and at a predetermined timing. An auxiliary tray to be transferred to the lower sheet processing tray, and a predetermined number of sheet bundles stacked in an aligned state on the sheet processing tray are transferred from one end of the sheet processing tray to the post-processed sheet bundle. Transport means for transporting the sheet bundle from the image forming apparatus in a direction orthogonal to the sheet transport direction, and the transport means transports the sheet bundle. When returning to an end portion of the one Te, and configured to pull back by placing one of the sheet supplied to the upper surface in the direction of the one end portion from the auxiliary tray.
The transfer means has a flat portion on which the sheet supplied from the auxiliary tray is placed, and a friction member is applied to the flat portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a post-processing apparatus according to the present invention will be described in detail with reference to the accompanying drawings, together with examples of an integrated processing apparatus.

1 to 3, a sheet processing apparatus 1
Has a post-processing device main body 20 and an integrated processing device main body 50 each having an independent housing.

The main body 20 of the post-processing apparatus, as shown in FIG.
When the post-processing is not performed, the pre-conveying unit 5 that conveys the sheet to the stacking tray 3 in a case where the post-processing is performed and the processing tray 4 is separable, and the plurality of sheets S received on the processing tray 4 are aligned. Alignment means 6 and aligned sheet bundle S '
Gripping means 7 for gripping and transporting, and first gripping means 7
The stapler 8 staples the sheet bundle S ′ held in the sheet tray S, and an auxiliary tray 13 located above the processing tray 4 and below the pre-conveyance means 5 as shown in FIG.

As shown in FIG. 3, the main body 20 of the post-processing apparatus includes a vertical wall 20a serving as a reference surface for storing the sheet S with respect to the processing tray 4, an opening 20b through which the sheet S is discharged, and an alignment member 30 to be described later. And the rail grooves 20c and 20d that allow the movement of the holding member 34, the rail grooves 20e that allow the movement of the first holding means 7, and the sheet bundle S 'after the stapling and stapling by the first holding means 7. Processing tray 4
And an opening 20f (FIG. 1) that allows cooperative movement to the two stacking trays 9A and 9B.

As shown in FIG. 1, the opening 20f is parallel to the processing tray 4 and parallel to the stacking trays 9A and 9B. Accordingly, the sheet bundle S 'moves in parallel from the processing tray 4 to the stacking trays 9A and 9B, whereby the integrity of the sheet bundle S' stacked on the stacking trays 9A and 9B is maintained well.

The main body 50 of the integrated processing apparatus is, as shown in FIG.
A stackable tray 9A, 9B capable of stacking a stack of sheets S 'bound by the stapler 8, and a stack of sheets S conveyed toward the stacking trays 9A, 9B while being held by the first holding means 7. ′, A second gripper 10 that grips while inheriting and transports it to a predetermined position on the stacking trays 9A and 9B, and a stacking tray 9 as shown in FIGS.
The sheet height detecting means (sheet surface detection sensor) 11 for detecting the height of the sheet bundle S ′ accumulated on the sheets A and 9B and the operator while the sheet bundle is being accumulated on the accumulation trays 9A and 9B. A middle take-out sensor 14 for detecting that all or a part of the sheet bundle has been removed, and an accumulation tray 9A;
The ascending / descending means 12 for ascending / descending the 9B and a shutter 15 interlocked with the elevating / lowering of the stacking trays 9A and 9B as shown in FIGS.

As shown in FIG. 1, a vertical wall 50a for positioning and alignment with which one side of the sheet bundle S 'conveyed to the stacking trays 9A and 9B abuts, as shown in FIG.
A horizontal opening 50b that allows the second gripping means 10 to move in the horizontal direction and a vertical opening 50c that communicates with the horizontal opening 50b and allows the second gripping means 10 to rotate in the vertical direction are formed.

As shown in FIG. 3, the stacking tray 3 is obtained by inclining the upper portion of the outer frame of the post-processing apparatus main body 20, and its upstream side is located downward and its downstream side is located upward. Also,
A vertical wall 3a is formed from the upstream end of the stacking tray 3, and an opening 3b for discharging is provided in an upper portion of the vertical wall 3a.

As shown in FIG. 4, the pre-stage conveying means 5 has a conveying port 21 opened on one side surface of the post-processing apparatus main body 20 on the rear side, and the conveying port 21 is an outlet of the copying machine 2 (shown in FIG. 4). Z)
Is matched to. On the downstream side of the transport opening 21, following the transport roller pair 22, the transport path of the sheet S is changed to a path 24 A on the upper accumulation tray 3 side and a path 24 B on the lower processing tray 4 side.
And a flapper 23A for switching between the two. The transport path 24A includes transport roller pairs 25A and 25B.
Is provided, and a discharge roller 26A,
26B and the sensor 17 are provided. A reversing path 24C is provided between the conveying paths 24A and 24B. When the sheet is turned over and discharged to the processing tray 4 when the sheet trails through the reversing flapper 23B provided on the conveying path 24A. By reversing the rotation of the transport roller pairs 25A and 25B, the sheet transport direction is reversed, and the sheet is supplied to the reverse path 24C. The sensor 23C is attached to the reversing flapper 23B.

The processing tray 4 is located below the stacking tray 3 and is inclined parallel to the stacking tray 3. On the processing tray 4, a series of sheets S to be stapled by the stapler 8 are transferred from the conveying roller pair 22 to the discharge roller 2 at the end of the path 24 </ b> B.
6A and 26B sequentially transport in the discharge direction A. As shown in FIG. 3, the processing tray 4 is formed such that an inclined lower end is formed to rise in a direction perpendicular to the tray surface, and an inner surface of the processing tray 4 contacts one side of a sheet S extending in a front-rear direction perpendicular to the discharge direction A. It becomes the wall 20a.

The aligning means 6 aligns the plurality of sheet bundles S 'stored on the processing tray 4 by contacting the reference surface 4a of the processing tray 4 before and after in the discharge direction as shown in FIG. The alignment is performed, and the discharge direction is left and right.
As shown by 0, the alignment is performed by the alignment members 30 disposed on both sides of the processing tray 4 and the shutter-type reference plate 31 that can move up and down.

The mechanism for moving the alignment member 30 is the processing tray 4
A rail 32 extending in the width direction is provided at a lower portion of the pulley. A holding member 34 that supports the alignment member 30 so as to be able to travel by a conical roller 33 is disposed inside the rail 32. A part of the holding member 34 is fixed in the middle of the belt 36. Then, one pulley 35B is driven by an alignment motor 37 (see FIG. 17) to
Moves.

As a result, while the sheets S are successively conveyed in the discharge direction A, the aligning member 30 is in the retreated open position, receives a predetermined number of sheets S, advances and presses against the reference plate 31. Perform alignment.

The reference plate 31 is, as shown in FIG. 16, a fixed plate 311 fixed to the inner wall of the post-processing apparatus main body 20.
A shutter solenoid 312 held by a fixed plate 311; a connection plate 313 provided at the tip of the shutter solenoid 312; a pair of arms 314 having one end connected to the connection plate 313;
A shutter plate 318 is connected to the other end of the arm 314 via connection pins 316 and 317 for converting the rotational movement of the arm 314 into a linear movement by a guide groove 315 formed in the arm 314. The shutter solenoid 31
2 is that the sheet S that is the basis of the next sheet bundle S ′ is discharged onto the processing tray 4 while one sheet bundle S ′ is being conveyed from the processing tray 4 to the accumulation trays 9A and 9B. First, the arm 314 is rotated so that the shutter plate 318 comes into contact with the upper surface of the sheet bundle S ′ in the process of being conveyed in order to enable the alignment of the sheet S as a base.

The first gripping means 7 holds the rear end of the sheet bundle S 'aligned on the processing tray 4 from above and below, and conveys the sheet bundle S' in the conveying direction B orthogonal to the discharge direction A. Also, the first
As shown in FIG. 11, the holding means 7 is provided with upper and lower holding levers 41 which open and close the moving frame 40, and a detailed mechanism is not shown, but the sheet bundle S ′ is operated with the operation of the bundle holding solenoid 43. Of one side. In addition, pinching lever 4
The forward / backward movement of 1 is performed by driving the holding lever motor 42 in FIG.

A flat auxiliary tray 13 as shown in FIGS. 4 and 14 is arranged above the processing tray 4 between the discharge roller pair 26 rotated by the drive of the transport motor 19. The auxiliary tray 13 has a shorter length and a smaller width than the processing tray 4, and is provided to be able to move forward and backward on the reference position side of the processing tray 4. That is, both ends of the auxiliary tray 13 are slidably supported by the upper and lower guide rollers 45, the pinion gear 47 is meshed with the rack 46 at the center, and the auxiliary tray 13 is slid and driven by the driving of the pinion gear 47 in conjunction with the driving of the auxiliary tray motor 48. You. The illustrated state is a state in which the auxiliary tray 13 is moving forward.

The auxiliary tray 13 conveys the next series of sheets S while aligning the sheet bundle S 'while the series of sheet bundles S' is being discharged onto the processing tray 4. When the sheet advances to the previous state and receives the next sheet S, it is separated from the sheet bundle S ′ being conveyed (during stapling).

As shown in FIG. 15, the auxiliary tray 13 has a return function of transporting the sheet S in the return direction C opposite to the discharge direction A when the sheet S is placed on the auxiliary tray 13. Having. This return function is performed by the discharge roller 26.
A and a discharge roller 26B elastically contacting the discharge roller 26A. In addition, the diameter of the discharge roller 26B is
6A is formed of a soft material, and its outer peripheral surface is lightly contacted with the sheet S on the auxiliary tray 13 so that the leading end of the sheet S is sent out in the return direction C in which the sheet S comes into contact with the abutment plate 20a. .

Since only about one or two sheets S are placed on the auxiliary tray 13, a mechanism for changing the thickness of the sheets S is unnecessary. In addition, auxiliary tray 1
The timing of the forward and backward movement of the sheet 3 is determined by the position of the leading end of the sheet that is disposed on the upstream side in the sheet discharging direction by the discharge rollers 26A and 26B as the discharging means and is discharged by the discharge rollers 26A and 26B.
The detection is performed based on the detection result of the detection sensor 17 in FIG. 4 that detects that the sheet S reaches the preceding sheet S stacked thereon.

That is, as shown in FIG.
The plurality of rail grooves 20c, 20d, and 20e extend in a direction perpendicular to the sheet S transport direction. Therefore, when the sheets S are not stacked on the processing tray 4, when the first sheet S is directly discharged to the processing tray 4,
There is a possibility that the buckling of the leading end of the sheet S due to the height of the processing tray 4 or the above-described clogging of the rail grooves 20c, 20d, and 20e may occur. Further, even if the sheets S are stacked on the processing tray 4, the next sheet S
There is a possibility that the leading end of the sheet abuts on the previous sheet S and buckles. Furthermore, the above-mentioned sheet bundle S ′ and the next sheet S must be separated.

Then, the sheet S is detected by the detection sensor 17.
By detecting the leading end of the sheet S, the auxiliary tray 13 is advanced, and by detecting the trailing end of the sheet S by the detection sensor 17, the auxiliary tray 13 is retracted, thereby solving the above-described problem.

At this time, the sheet S is a set of a sheet bundle S '.
It is conceivable that a plurality of sheet sizes are mixed. Therefore, the retreat timing of the auxiliary tray 13 by the auxiliary tray motor 48 based on the sheet size information output from the copying machine 2 and the sheet detection result by the detection sensor 17 determines whether the sheet size information output from the copying machine 2 is larger. Buckling according to the sheet size can be prevented by setting the size faster as the size becomes larger. Even when the sheet sizes are not mixed, the evacuation timing may be set earlier as the sheet size becomes larger than an arbitrary sheet size (for example, A4 landscape).

While the sheet bundle S 'on the lower processing tray 4 is being transported to the stacking trays 9A and 9B by the first gripping means (transporting means) 7, at least the auxiliary tray 13 is copied. Sheet S sent from the machine 2 side
After the first gripper 7 has delivered the sheet bundle S ′ to the second gripper 10, the auxiliary tray 13 is immersed (retracted) to drop the sheet S to the lower processing tray 4 side. Is also good.

In order for the post-processing apparatus to post-process the sheets S successively conveyed from the high-speed image forming apparatus at a high speed, the first holding means 7 stores the sheet bundle S 'in the stacking tray 9A, If it is necessary to transfer the sheet S to the auxiliary tray 13 until the sheet S is transported to the 9B side and returns to the original predetermined position, the speed of the post-processing is hindered.
Even if the auxiliary tray 13 drops the sheet S to the lower processing tray 4 side when the gripper 7 transfers the sheet bundle S ′ to the second gripper 10 and returns to the original predetermined position, the sheet S ′ is Since the sheet bundle S 'is placed on the first holding means 7 and is separated from the stacking trays 9A and 9B of the sheet bundle S', it is desirable to prevent the sheet S from jamming.

For this reason, as shown in FIG. 3, the first sheet gripping means 7 has a flat upper part 41 and a rubber sheet 41a having a high coefficient of friction applied thereon.
The sheet S is positively pulled away from the stacking trays 9A and 9B, so that the sheet S is not drawn in the same direction after the sheet bundle S 'is delivered to the second gripping means 10. It is possible to prevent a situation in which a jam or turning over occurs.

FIG. 14 shows a state where a relatively large sheet S is being conveyed to the processing tray 4.
In this case, the sheet S on the auxiliary tray 13 is supported so as to hang from the auxiliary tray 13 onto the processing tray 4. When a small-sized sheet S is conveyed, it can be placed only by the auxiliary tray 13.

The stapler 8 binds the vicinity of the edge of the sheet bundle S 'with staples (binding needles), and is disposed near the front end of the vertical wall 20a of the processing tray 4 on the side of the stacking device main body 50. I have.

The sheet bundle S 'to be bound by the stapler 8
The binding position and the number of bindings are performed as the first gripper 7 and the second gripper 10 convey. That is, when binding is performed at one location, the document is held by the first gripping means 7 and stopped while the sheet is conveyed at a predetermined position in accordance with the stapler 8 to perform binding. In the case of binding at two places, after binding and transporting by the first gripping means 7 and binding the first position to the stapler 8,
After switching to the second gripping means 10, the second position is bound to the stapler 8 and bound. Note that the stapler 8 may be provided so as to be movable in the discharge direction A so that the stapling position can be changed.

The stacking trays 9A and 9B are arranged in parallel in front of the processing tray 4, that is, shifted in a direction perpendicular to the discharge direction A, and have concave portions 9C and 9
D is formed. Each of the stacking trays 9A and 9B has
Paper presence detection sensors 9E and 9F are provided.

As shown in FIGS. 5 and 6, the stacking trays 9A and 9B have side walls 50L,
A vertical wall 50a of the main body 50 of the integrated processing device serves as an integrated reference surface. The position of this accumulation reference plane is determined by the vertical wall 4a of the processing tray 4.
Is set at a distance d (see FIG. 10) in the discharge direction A from the position of.

Both ends in the width direction of the stacking trays 9A and 9B are
The U-shaped elevating frame 52 is fixedly supported by the side walls 50L and 50R.
It is guided so as to be able to move up and down along a vertical groove 54 provided in L, 50R.

The upper frame 62 and the lower frame 63 on the rear side of the main body 50 of the integrated processing apparatus have a pulley 55,
A belt 57 is hung between the upper and lower pulleys 55, 56, and a driven gear 58 fixed to a rotation shaft of the pulley 55 meshes with a driving gear 59 of the accumulation tray motor 60 to rotate the upper pulley 55. Driven. The elevating frame 52 is fixed in the middle of the belt 57 by a fixture 52a, and moves up and down as the belt 57 runs.

A spring 65 is mounted between the lifting frame 52 and the upper frame 62.
The urging force of No. 5 obtains an upward supporting force, so that the weight of the sheet bundle S ′ on the processing tray 4 does not excessively act on the accumulation tray motor 60.

The elevating frame 52 is provided with a transmission type upper tray position detection sensor 61 and a lower tray position detection sensor 64, and is integrated depending on whether or not light is shielded by the light shielding plate 66 attached to the side wall 50R. The positions of the trays 9A and 9B can be detected.

As shown in FIGS. 12 and 13, the second holding means 10 is held by the first holding means 7 and is conveyed so as to be pushed out of the processing tray 4 onto the collecting tray 9A or 9B. The second holding means 10 has upper and lower holding levers 71 and 72 for pressing the upper surface and the lower surface of the sheet bundle S 'in a plane, and holding and releasing the sheet bundle S' by an opening / closing mechanism. At the same time, the held sheet bundle S ′ is transported by the transport mechanism in the transport direction B orthogonal to the discharge direction A. Further, the gripping portion of the sheet bundle S 'gripped in the inclined state is pivoted to a horizontal state by the pivoting mechanism, and is also slightly moved to the stacking trays 9A and 9B.

First, the upper holding lever 71 is pivotally supported at its base end by a first shaft 74 with respect to a swing frame 73, and the lower holding lever 72 is connected to the swing frame 73 by a second shaft 75. It is pivotally supported. A first arm 76 is pivotally supported on the first shaft 74 so as to rotate integrally with the partial gear 77, and a tip pin 76 a of the first arm 76 engages with a groove 71 a of the upper holding lever 71 to open and close. . Similarly, a second arm 78 is pivotally supported on the second shaft 75, and a tip pin 78a of the second arm 78 engages with a groove 72a of the lower holding lever 72 to open and close. 7
9, the gear portion 79 meshes with the partial gear 77 of the first arm 76, and the upper and lower holding levers 71 and 72 are rotated as the arms 76 and 78 rotate in conjunction with each other.
Is provided to rotate.

The other portion of the partial gear 77 includes the swing frame 7
The drive gear 8 of the opening / closing motor 83 having the swing frame 73 mounted on the intermediate gear 81 which rotates with the pinion gear 80 supported by the pinion gear 80
2 mesh with each other to form an opening / closing drive mechanism. In addition,
The open / close state of the upper and lower holding levers 71 and 72 is detected by a sensor (not shown) of the operating piece 84 that rotates integrally with the upper holding lever 71.

At the time of opening and closing operation of the second gripping means 10, the opening angle of the partial gear 77 of the upper holding lever 71 is large and the diameter of the gear portion 79 of the lower holding lever 72 is small. 71 opens about 30 °, while the lower holding lever 72 opens about 90 ° downward (see FIG. 13).

The swing frame 73 has a swing shaft 85 at the lower end.
Accordingly, the movable frame 87 is pivotally supported by the movable frame 87. A rotating gear 89 is supported on a moving frame 87 by a shaft 88 parallel to a swing shaft 85, and an eccentric position of the rotating gear 89 and a rear portion of the swing frame 73 above the swing shaft 85 are connected by a link 90. With the rotation of the rotating gear 89, the swing frame 73 is swung via the link 90 between the retracted position in FIG. 12 and the protruding position in FIG.

A pinion gear 91, which is pivotally supported on the moving frame 87 in a direction perpendicular to the swing shaft 85, meshes with the outer peripheral gear portion of the rotary gear 89, and the moving frame 87 is engaged with an intermediate gear 92 integral with the pinion gear 91. The drive gear 93 of the swing motor 94 attached to the gears meshes to form a swing mechanism.

The transport mechanism of the moving frame 87 is such that a traveling member 95 protruding left and right in front of and behind the moving frame 87 is provided in a guide groove (not shown) extending in the front-rear direction formed in the guide frame 100 fixed to the main body. The moving frame 87 is supported so as to be movable in the front-rear direction (transport direction B).

A pulley 102 is provided inside and behind the guide frame 100 with a pulley shaft 101 (one is not shown).
And the belt 103 is hung. A moving frame 87 is fixed to a part of the belt 103 by a clamp member 104, a driven pulley 105 is fixed to an end of one pulley shaft 101, and a driving shaft of a transport motor 108 attached to a lower portion of the guide frame 100 is driven. A drive belt 106 is hung between the pulley 107 and the pulley 107.

The moving frame 87 moves forward or backward in the conveying direction B together with the second gripping means 10 by the forward or reverse driving of the conveying motor 108. The initial position (home position) of the second gripping means 10 is a receiving position close to the processing tray 4 side.
Is moved to the intermediate stop position for binding and the most advanced discharge position. The opening and closing operation of the second gripping means 10 is performed at the initial position and the release position, and swinging is performed at the release position.

Further, such a transport mechanism, an opening / closing mechanism of the second gripping means 10 and a swing mechanism are arranged in a cover of the main body 50 of the integrated processing apparatus, the moving range is covered, and a slit-shaped horizontal The opening 50b is opened, the second gripping means 10 moves while holding the sheet bundle S 'along the horizontal opening 50b, and the upper and lower holding levers 71, 72 which swing at the discharge end protrude. .

As shown in FIG. 5, in the seat height detecting means 11, a rotation detector 110 having an arc-shaped tip is pivotally supported on the frame of the fixed portion.
The spring 11
1 is provided so as to be rotatable in and out. The tip of the rotation detector 110 can contact the upper surface of the sheet bundle S 'on the stacking trays 9A and 9B, and the amount of rotation detects the position of the upper surface of the sheet bundle S' on the processing tray 4 so that the processing tray 4 To control the vertical movement of

The operation of each mechanism is linked and controlled by a control unit. The number of sheets, the number of sets, the presence or absence of staples, the staple position, and the like are set by an operator on the control panel, and the drive of each unit is controlled based on the settings. You.

When the stacking tray 9A passes through the horizontal opening 50b, the sheet bundle S 'on the stacking tray 9A is caught in the horizontal opening 50b or enters the stacking tray 9A as the stacking tray 9A tilts. A shutter plate 16 for opening and closing the horizontal opening 50b, and a drive unit 18 for moving the shutter plate 16 up and down.

The shutter plate 16 is, as shown in FIG.
Elongated holes 16A are provided above and below both sides, and as shown in FIG.
Pins 16B provided on the side walls 50L and 50R are supported to be vertically movable. The shutter plate 16 has a horizontal opening 16C and openings 16D to 16F.

The opening 16D has a slot 16G as shown in FIG.
Movable plate 16 which is supported by the shaft 16H and rotates.
It is covered with J, and is pushed out by the turning operation of the second gripping means 10 as shown in FIG.

A lift plate 16K is supported on the opening 16E by guides 16L on both sides so as to be able to move up and down, and is pushed down by the rotation of the second gripping means 10 as shown in FIG. The return is performed by the spring 16M. Therefore, when the second gripping means 10 does not rotate, the movable plate 16J and the elevating plate 16K are closed and safe.

The opening 16F is a hole through which the rotation detectors 110 and 14A of the sensors 11 and 14 enter and exit.

The shutter plate 16 is provided with a rack 16N, an open position detecting lever 16P, and a closed position detecting lever 16Q.

On the other hand, a support frame 18A is horizontally mounted between the side walls 50L and 50R, and includes a driving unit 18, a sensor 18B for detecting an open position detecting lever 16P, and a sensor 18C for detecting a closed position detecting lever 16Q. Is provided.

The driving section 18 includes a pulse motor 18D, a timing pulley 18E, a timing belt 18F,
It has a timing pulley 18G and a pinion 18H that meshes with the rack 16N.

When the copying operation is started, the shutter plate 16 is lowered to open the horizontal opening 16C so as to coincide with the horizontal opening 50b. When the set number of copying operations is completed, the shutter plate 16 is raised and closed.

By the way, the various driving systems described above correspond to FIG.
As shown in FIG. 2, the parallel I / O 1 is controlled by input / output signals from the CPU 120 and storage means 121 such as ROM and RAM.
The drive 22 is controlled.

Next, the post-processing step of the sheet S will be described with reference to FIGS. In the flowcharts of FIGS. 18 and 19 showing a series of post-processing steps and the timing chart of FIG. 20, it is assumed that two sheets S (of the same size) are stapled as a sheet bundle S ′ and then stacked. In addition, the numbers attached to the reference character M in the drawing indicate the operation divisions of each unit or the operation time.

One of the two trays 9A and 9B is moved to the discharge port depending on the state of the paper presence / absence detection sensors 9E and 9F and the tray position detection sensors 61 and 64 on the accumulation trays 9A and 9B. When the image forming operation of the image forming apparatus 2 is started, the motor 18D is driven, the shutter plate 16 is lowered, and the opening position detecting lever 16P is
When B is detected, the motor 18D stops. In this state, the horizontal opening 50b coincides with the horizontal opening 16C of the shutter plate 16, and the opening 50b is opened as shown in FIG.

In the flowchart, as an initial setting, the number N of conveyed sheets discharged from the image forming apparatus 2 is set.
= 0, and the sheet alignment flag is set to F0 = 0 assuming that the previously conveyed sheet has been aligned.
(Alignment completed) (S1, S2). The sheet S is sequentially discharged from the image forming apparatus 2 (S3), and at this time, the auxiliary tray 13 is protruded and conveyed to increase the N,
A series of plural (two) sheets S are stacked (S4, S
5, S6), N = 0 is set for the next transport (S7). Assuming that the sheets have been aligned (S8), the auxiliary tray 13 sinks and the sheet bundle S 'falls onto the processing tray 4 and is accommodated (S9, S10). (M1: operation of a paper ejection sensor and a transport motor (not shown)). Subsequently, the alignment member 30 moves to push the rear side of the sheet S and press the front side against the reference plate 31 to align the front and rear direction of the sheet S (S11, M2: alignment). Auxiliary tray 1
When the next series of sheets S is carried in while the sheet S is being aligned (F0 = 1), the sheet S protrudes (M3), and this sheet S is aligned and conveyed downward. (S11 to S14).

FIG. 21 shows a state in which the sheet bundle S ′ is transported from the processing tray 4 to, for example, the stacking tray 9A (leftward in FIG. 21). The process up to the transfer to the means 10 is shown. 3A, 3B, and 3C show states in which the conveyance of the sheet bundle S 'proceeds sequentially.
The stapler 8 and the stapler 8 are in a fixed position during the moving stroke.

When the alignment is performed, the first gripping means 7 moves to the initial position (shown by a solid line in FIG. 10) (S15, M
Four). At this time, the second gripping means 10 is at the initial position (shown by a solid line in FIG. 10) (S16). Here, a flag indicating whether or not the sheet bundle S 'is being transferred is set to F1 = 0 (not being transferred) (S17). The sheet bundle S in the above alignment state
'The rear side is gripped (nip) by the first gripping means 7 (S18, S19, M5, shown by a chain line in FIG. 21A).

The reference plate 31 (shutter) is raised (S
20, M6), and waits for a new transfer of the sheet bundle S '(F1 =
1, S21), after the sheet bundle S 'is made movable in the transport direction B, the first gripping means 7 is driven forward to move the sheet bundle S' forward by a predetermined amount, and the sheet bundle S 'intersects with the discharge direction A. It is moved to the first staple position in the direction of the tray 9A (S22, M7, shown by a solid line in FIG. 21A), and the first staple is bound by the stapler 8 (S2).
3, M8). When the reference plate 31 rises, the sheet bundle S
The sheet bundle S 'is lowered immediately after it enters, but in this lowered state, the sheet bundle S' is lightly pressed to allow passage.

Subsequently, the first holding means 7 moves further forward and stops at the second stapling position (S24,
M9, (b) in FIG. 21, and the state of the solid line in FIG. 3). At this time, the second gripping means 10 is moved to the initial position on the processing tray 4 side (FIG. 1).
0, the solid line position in FIG. 11), and swings to the retracted position in FIG. 12, and waits for the first gripping means 7 to stop.
The gripping means 10 inherits and grips one side of the sheet bundle S 'in the inclined state on the reference position side in the stopped state (S25, M10).

After performing the above-described gripping by the second gripping means 10, the gripping of the first gripping means 7 is released (S26,
M11, (c) in FIG. 21), the first gripping means 7 moves to the holding position (indicated by a solid line in FIG. 10) to hold the next sheet bundle S ′ (S27), and the next sheet bundle S 'Can be transferred (S28). Then, the second position is bound by the stapler 8 (S29, M12). The transfer amount of each of the staple positions is set for the first gripping means 7 based on an instruction from the operator.

Subsequently, the second gripping means 10 moves to the front release position (the position indicated by the dashed line in FIGS. 10 and 11), ends the transfer to the transfer B, and stops (S30, M13). At this release position, the second gripping means 10 is swung from the retracted swinging position shown in FIG. 12 to the protruding position shown in FIG. 13, so that the gripping state of the second gripping means 10 becomes a horizontal state and the conveying direction. It is moved in a direction orthogonal to B (S31, M14). When the second gripping means 10 swings from the retracted swinging position in FIG. 12 to the protruding position in FIG. 13, the movable plate 16J is rotated by the second gripping means 10 and the elevating plate 16K is rotated.
Descends.

The end position corresponding to the reference position on the processing tray 4 is gripped and conveyed by the second gripping means 10 as shown in FIG. 12, and is swung to the state shown in FIG. The end is moved to the stacking tray 9A side. The moved position substantially coincides with the reference surface 50a of the stacking tray 9. With this movement, the end of the sheet gripped becomes horizontal (M14), and the upper and lower holding levers 71, 7
2 is opened as indicated by the chain line (S32, M1
5) The gripped sheet bundle S 'falls downward and is discharged as it is, and is stacked on the sheet bundle S' already accumulated on the accumulation tray 9.

At this time, the end of the sheet bundle S 'which falls is not largely shifted from the end of the sheet bundle S' which is stacked below, and the end of the sheet bundle S 'which falls is lower.
Stack without being locked at the staple position.

In the state where the second gripping means 10 is released, the swinging frame 73 is moved backward (S33, M16), and then the transporting direction B is set so that the second gripping means 10 returns to the initial state.
(S34, M17).
At this time, even if the next sheet bundle S ′ is sent out, the sheet bundle S ′ does not interfere with the upper sheet holding levers 71 and 72 because the upper sheet holding levers 71 and 72 are sufficiently opened.
Subsequently, in the initial position, the closing operation is performed and the next sheet bundle S
'Can be gripped.

As described above, when the second gripping means 10 is swung horizontally (M14), the actuator (bundle holding solenoid) 112 operates, and the rotation detecting body 110 enters the sheet bundle holding state ( S35) The seat height is detected (S36), the operation of the actuator 112 is subsequently released, and the holding state is released (S37, M1).
8). When it is higher than the predetermined position, the collecting tray 9A is
The lowering operation is performed to a predetermined level by the operation of the lifting / lowering means 12 (S
38, M19). Further, when the sheet bundle S ′ that has been accumulated in the middle is taken out by the operator, the sheet bundle S ′ is moved up in response to the detection of the middle take-out sensor 14.

The second gripping means 10 is moved within the cover when transported in the front-rear direction.
And a transport mechanism for the sheet bundle S ′ on the accumulation tray 9A.
Does not interfere with the operator trying to retrieve the.
Further, since the sheet bundle S ′ is conveyed in a gripped state,
During the conveyance, the alignment of the sheet bundle S 'is not disturbed.
Here, when the sensor 11 detects that a predetermined number or more sheets have been stored in the stacking tray 9A, for example, the motor 60 shown in FIG. 5 is driven to raise the elevating frame 52 and store the lower tray 9B. Stops when moved to position.
At this time, the shutter 15 is closed and the stacking tray 9 is closed.
The sheet on A does not enter the horizontal opening 50b. Thereafter, the sheet bundle is similarly accumulated on the accumulation tray 9B.

In the above-described embodiment, the first gripping means 7 and the second gripping means 10 are constituted by holding levers which are pressed and held in a planar shape. You may make it hold | maintain. The transport mechanism of each part can be changed, and the actuator can also be changed to a known mechanism.

Further, in the above embodiment, an example in which the present invention is applied to the copying machine 2 as an image forming means has been described.
Can be applied to various types of image forming means (image recording apparatus) such as a printing machine (including a laser printer) and a facsimile, in addition to being applied to both digital and analog systems.

[0081]

As described above, in the sheet processing apparatus of the present invention, when the sheet transport means is transporting the sheet bundle to the sheet stacking apparatus, the auxiliary tray is transported from the image forming apparatus. To prevent the sheet from being dragged toward the stacking tray, but when the sheet transfer means finishes the transfer of the sheet bundle and returns to the original predetermined position, the sheet held on the auxiliary tray is completely removed. And the sheet is placed on the sheet transfer means. As a result, the conveyed sheet is pulled back in the opposite direction from the sheet stacking apparatus even if the sheet is of a large size such that it cannot ride on the auxiliary tray and its leading end hangs down on the processing tray. Therefore, jamming and turning over of the sheet are eliminated, and post-processing of the sheet conveyed at a high speed is enabled.

[Brief description of the drawings]

FIG. 1 is a front external perspective view of a sheet processing apparatus according to the present invention.

FIG. 2 is a perspective view of a rear appearance of the sheet processing apparatus.

FIG. 3 is an external perspective view in which a part of the sheet processing apparatus is broken.

FIG. 4 is a side view in which a part of the main body of the post-processing apparatus is cut away.

FIG. 5 is a side internal structure diagram of the integrated processing apparatus main body.

FIG. 6 is a front internal structural diagram of an integrated processing apparatus main body.

FIG. 7 is a front external view of an integrated processing apparatus main body.

FIG. 8 is a structural view of the back surface of the shutter 15.

FIG. 9 is a side view showing a mechanism of the shutter 15;

FIG. 10 is a plan sectional view of the sheet processing apparatus.

FIG. 11 is a schematic front view of the sheet processing apparatus.

FIG. 12 is an enlarged cross-sectional view of a main part of a side surface of the sheet processing apparatus in an initial state of a second gripping unit.

FIG. 13 is an enlarged cross-sectional view of a main part of a side surface of the sheet processing apparatus in a state where a sheet bundle is dropped by a second gripping unit.

FIG. 14 is a perspective view of an auxiliary tray in the sheet processing apparatus.

FIG. 15 is an explanatory diagram illustrating an operation of an auxiliary tray in the sheet processing apparatus.

FIG. 16 is an enlarged front view of a reference plate in the sheet processing apparatus.

FIG. 17 is a block diagram of a control system of the sheet processing apparatus.

FIG. 18 is a first half flowchart illustrating a post-processing step of the sheet processing apparatus.

FIG. 19 is a second half flowchart illustrating a post-processing step of the sheet processing apparatus.

FIG. 20 is a timing chart illustrating a post-processing step of the sheet processing apparatus.

FIGS. 21A to 21C are explanatory diagrams illustrating, in chronological order, steps of transferring a sheet bundle from a processing tray to a stacking tray in a post-processing step of the sheet processing apparatus.

[Explanation of symbols]

 S-sheet 1-sheet processing apparatus 2-copier (image forming means) 4-processing tray 13-auxiliary tray 7-first holding means (transfer means) 10-second holding means 9-stacking tray 41-first holding Flat part 41a on means-high friction member

Continuation of the front page (72) Inventor Tsuyoshi Asahara 430-1, Kobayashi, Masuho-cho, Minamikoma-gun, Yamanashi Prefecture Nisca Corporation

Claims (8)

[Claims] 1. A sheet post-processing apparatus for stacking a plurality of sheets conveyed from an image forming apparatus on a sheet processing tray with their end faces aligned, and post-processing the aligned bundle of sheets, An auxiliary tray that is positioned above the sheet processing tray and temporarily receives a sheet conveyed from the image forming apparatus and transfers the sheet to the lower sheet processing tray at a predetermined timing; The post-processed sheet bundle is
Transport means for transporting the sheet bundle from the image forming apparatus in a direction orthogonal to the sheet transport direction, wherein the transport means transports the sheet bundle and returns to the original predetermined position from the auxiliary tray. A sheet post-processing apparatus, wherein a sheet to be supplied is placed on an upper surface thereof and pulled back toward the predetermined position. 2. A post-processed sheet bundle transported in a direction orthogonal to a sheet transport direction from the image forming apparatus by the transporting means is delivered to a sheet stacking processing device that stacks the sheet bundle. Claim 1 comprised in
4. The sheet post-processing device according to 1. 3. The transfer unit, when transferring the sheet bundle, grips an end of the post-processed sheet bundle, and in the gripped state, is orthogonal to a sheet conveying direction from the image forming apparatus. Gripping means to transfer in the direction of
The sheet post-processing device according to claim 1. 4. The gripping device according to claim 3, wherein the gripping means has a flat portion on which the sheet supplied from the auxiliary tray is placed, and the flat portion is provided with a friction member. Sheet post-processing equipment. 5. The auxiliary tray receives the sheet by advancing upward and forward of the sheet processing tray for a predetermined time after the sheet is conveyed from the image forming apparatus, and retracts the sheet rearward to cause the sheet to retreat. 2. The sheet post-processing apparatus according to claim 1, wherein the sheet is transferred onto the lower sheet processing tray. 6. The sheet tray according to claim 1, wherein the sheet bundle stacked on the sheet processing tray shifts to the post-processing step, or when the sheet is not stacked on the sheet processing tray. The sheet post-processing apparatus according to claim 1, wherein the sheet post-processing apparatus is configured to advance above the processing tray. 7. The sheet post-processing apparatus according to claim 6, wherein a direction in which the auxiliary tray advances and retreats is parallel to a direction in which a sheet is conveyed from the image forming apparatus. 8. The sheet according to claim 7, wherein the advance and retreat timings of the auxiliary tray are variably controlled according to a sheet size transmitted from the image forming unit. Post-processing device.