JPH0527523A - Image forming device - Google Patents

Abstract

PURPOSE:To automatically execute work for packing papers sorted and ejected on respective bins into an envelope with good operability and to make the envelope where the papers are packed look nice by selecting a size fitted to the size of the paper. CONSTITUTION:The sizes of the paper P and the envelope Pf fed from paper feeding cassettes 15A-15D or a tray 24 are respectively detected by a size detecting sensor 32 and a size detecting device 30, and the size of the envelope which can house the paper of the detected size is recognized, then the recognized size of the envelope and the size of the envelope which is detected by the sensor 32 are collated. In the case that the envelopes of the size that the paper can be housed are plural, as the collated result, the envelope of the minimum size out of the plural envelopes is automatically selected by a 1st mode. In the case of freely selecting the envelope, all the envelopes of the size that the paper can be housed are displayed on a display part 104 by a 2nd mode. Therefore, packing the paper into the envelope is automatically performed with good operability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus which can sort and discharge sheets of paper on which an image has been formed and which is to be discharged from a main body of the apparatus, into a plurality of paper stacking bins (hereinafter also simply referred to as bins).

[0002]

2. Description of the Related Art Conventionally, as an image forming apparatus capable of sorting sheets on which images are formed and discharging them into a plurality of sheet stacking bins, for example, Japanese Patent Laid-Open No. 61-1450.
There is one described in Japanese Patent Publication No. 69.

In this image forming apparatus, the paper ejected onto the bin is clipped by a clip, and the paper placed on the bin is slid so that the paper is transferred to another large paper storage portion. By providing the means for copying, even if a large number of sheets exceeding the number of sheets that can be stored in one bin are copied, the copying operation is stopped even when the number of copies reaches the number of sheets that can be stored per bin. The copy operation is continued without interruption.

[0004]

However, in such an image forming apparatus, even if the total number of copies exceeds the storable number of sheets per bin, the number of copies can be increased in units of jobs before reaching the storable number. Since the paper is clipped and transferred to the large paper storage unit due to the inclination of the bin, the copying operation is not interrupted on the way, so the operator can fill the bin full of paper on the way. It is convenient because you do not have to do the troublesome operation of restarting the copying operation after removing the
Even if an attempt was made to insert a copy, which has recently been increasing in number, into the envelope by this device, it could not be done.

The present invention has been made in view of the above-mentioned problems, and it is possible to automatically and with good operability the work of packing the discharged sheets sorted into each bin into the envelope. In addition, it is an object of the present invention to ensure that the filled envelope has a good-looking appearance suitable for the paper size.

[0006]

In order to achieve the above object, the present invention provides an image forming apparatus as described above,
Paper size detection means for detecting the size of the paper fed from the paper storage section, envelope size detection means for detecting the size of the envelope that is set, and envelope size for displaying the size of the envelope detected by the means A display unit, a recognition unit for recognizing an envelope size capable of accommodating the size of the paper detected by the paper size detection unit, and a collation unit for collating the envelope size recognized by the unit with the envelope size detected by the envelope size detection unit. Is provided, and when there are a plurality of envelopes of a size capable of storing paper in the collation by the collating means, the first mode for automatically selecting the smallest size envelope among them and all of the envelopes of the storable size are selected. A second mode for displaying on the envelope size display section is provided.

Then, the image forming apparatus is provided with means for automatically selecting the first mode when the power is turned on or when the mode is cleared, or an envelope of a size capable of accommodating sheets by the collation by the collating means. If there is not, it is advisable to provide a means for displaying it.

[0008]

According to the image forming apparatus configured as described above, when there are a plurality of envelopes each having a size capable of accommodating a sheet by the collation by the collating unit, the first mode is set and the smallest size envelope is automatically selected. Since the operator does not have to worry about the envelope size, the operability is improved, and the envelope filled with papers looks good. Further, if the second mode is selected, all envelopes of a size capable of accommodating sheets are displayed on the envelope size display section, so that the operator can freely select the envelope to be used.

Further, by providing a means for automatically selecting the first mode when the power is turned on or when the mode is cleared, the operator does not have to perform an envelope selection operation when the power is turned on or the mode is cleared. The smallest envelope size suitable for the paper to be used is automatically selected.

Further, if there is no envelope having a size capable of accommodating a sheet, a means for displaying the envelope is provided so that there is no envelope having a size capable of accommodating the sheet used by the collation by the collating means. It is convenient because it will be displayed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic diagram showing a size detection system for detecting the sizes of sheets and envelopes, which are essential parts of the image forming apparatus according to the present invention, and a control system for inputting a detection signal from the size detection system. FIG. FIG. 1 is an overall configuration diagram showing a digital copying machine as a.

As shown in FIG. 1, a digital copying machine as an image forming apparatus includes a sorter / stapler / packager apparatus (hereinafter referred to as SS) which is a post-processing apparatus on a side portion of an apparatus main body 1.
3) is attached. And that SSP
A plurality of paper stack bins 35 for stacking paper P on the apparatus 3
And a sort guide unit 44 serving as a sort discharging unit that sorts and discharges the paper P on which an image is formed by being fed from the paper feeding unit 11 serving as a paper storing unit of the apparatus main body 1,
A pack unit 46 serving as a means for carrying the paper P on the bin into the envelope Pf is provided.

Further, the paper feed cassettes 15A to 15A
Paper P or envelope Pf fed from 15D and tray 24 (any of which can be stored or set)
Size detection sensors 3 that also function as both paper size detection means and envelope size detection means for detecting the size of each
2 and the size detection device 30, a display unit 104 (envelope size display unit) that displays the size of the envelope detected by these detection systems, and the size detection sensor 32 or the size of the paper detected by the size detection device 30 is stored. A control device 120 having a function of recognizing possible envelope sizes and collating the recognized envelope size with the envelope size detected by the size detection sensor 32 or the size detection device 30 is provided.

The control unit 12 of this copying machine is used.
If there are multiple envelopes of a size that can hold paper by collation with 0, the smallest envelope is automatically selected among them.
Mode and a second mode in which all envelopes of the storable size are displayed on the envelope size display unit 104. Then, the control device 120 uses the main switch 70.
When the power is turned on or when the mode is cleared, the first mode is automatically selected.

Further, in the above collation, if there is no envelope of a size capable of accommodating the sheet, it is displayed on the envelope size display section 104. As shown in FIG. 2, this digital copying machine has a circulation type automatic document feeder (R
DH) 2 is mounted, a sorter / stapler / packager device (hereinafter referred to as SSP device) 3 as a post-processing device is mounted on the upper part of the left side surface, and a storage carrier 4 for storing envelopes filled with paper is mounted on the lower part. I am wearing each.

In this digital copying machine, the image information after the image processing by the image scanning section 5 is written on the photosensitive drum 7 in the form of a set of light points by the raster scanning of the laser beam by the writing section 6. Be done. A semiconductor laser is used as the laser light source.

The surface of the photosensitive drum 7 is uniformly negatively charged by the charging charger 8 of the corotron system. When the negatively charged photosensitive drum 7 is irradiated with laser light and the potential of the image portion is dropped,
The surface potential of the photosensitive drum 7 is -750.
At −800 V, an electrostatic latent image with an image portion potential of about −50 V is formed.

The electrostatic latent image is visualized by the negatively charged toner when a developing roller of the developing device 9 applies a bias voltage of -500 to -600V.
The visualized image is fed from the paper feeding unit 11 and is timing-adjusted in accordance with the rotation of the photoconductor drum 7 onto the paper surface (transfer paper) P, and the back side of the paper surface by the transfer charger 12. It is transferred by applying a positive potential charge from.

The sheet on which the image has been transferred is separated from the surface of the photosensitive drum 7 by AC charge removal by a separation charger 13 which is held integrally with the transfer charger 12. At this time, the residual toner remaining on the photoconductor drum 7 is scraped off the surface of the photoconductor drum 7 by the cleaning blade of the cleaning device 14, and is stored in the recovery tank. Then, the potential remaining on the surface of the photoconductor drum 7 is erased by being irradiated with light by a charge eliminating lamp (not shown).

On the other hand, the paper P on which the image is transferred is the four-stage paper feed cassettes 15A to 15 provided in the paper feed section 11.
It is selectively sent out from D according to the paper size.
In other words, when the operator selects a paper feed cassette in one of the stages and presses the start key, the paper feed roller of the selected stage rotates and the paper in the paper feed cassette is fed, which is then conveyed. It is fed until it hits the nip of the registration roller 16 by a roller provided on the road.

The registration roller 16 feeds the image toward the photosensitive drum 7 at a timing so that the position of the image formed on the photosensitive drum 7 and the position of the sheet coincide with each other.

In this way, the paper P is fed, the image is transferred to the paper P by the method described above, and the image (toner image) is fixed by the fixing roller. Then, the paper P on which the image is fixed is fed into the SSP device 3 and guided by the switching claw 21 which is in the straight advance position during normal printing, and is discharged onto the paper discharge tray 22.

FIG. 3 shows each sheet feeding cassette 15 of the sheet feeding section 11.
FIG. 16 is a perspective view for explaining a size detection system that also serves as A to 15D and a sheet size detection unit and an envelope size detection unit. Each of the sheet feeding cassettes 15A to 15D of the sheet feeding section 11 is provided with a size indicating plate 31 formed corresponding to each sheet size or envelope size to be stored,
When the paper feed cassette is set in the main body of the apparatus, a size detecting sensor 32 provided on the main body side in correspondence with the size indicating plate 31 detects the size indicating plate 31, and the paper or envelope ( In FIG. 3, the size of the envelope Pf is inserted) is detected.

A size sticker 33 is attached to each side surface 15a of the paper feed cassettes 15A to 15D so that the user can tell at a glance the size of the items stored in the cassette. Further, paper feeding in this copying machine is also performed from a manual feed tray 23 that can be opened and closed on the right side surface of the apparatus main body 1 in FIG. 2 between positions indicated by solid lines and phantom lines, and a tray 24 provided below it. You can do it.

The tray 24 includes paper feed cassettes 15A ...
More sheets and envelopes than 15D can be set. As shown in FIGS. 4 and 5, the sheets and envelopes Pf are placed on the bottom plate 25 and the guide rods 26 shown in FIG. It is sandwiched by a pair of side guides 27, 28 that can slide in the direction of arrow A, and is set at the central position of the bottom plate 25.

Below the bottom plate 25, the side guide 2 is provided.
A size detection device 30 (for example, a variable resistance type position sensor) that detects the paper size on the bottom plate 25 by detecting the position of 8 is provided, and the value detected by this is compared with the size data stored in advance. Thus, the size of the paper P or envelope Pf set on the bottom plate 25 can be recognized.

The SSP device 3 serving as a post-processing device discharges the paper, envelopes, etc. on which an image is formed and discharged from the device main body 1 shown in FIG. 2 to the paper discharge tray 22 as described above.
The role of sorting the sheets or the like according to the contents to be selected and discharging them onto the respective bins 35 arranged in multiple stages, binding the sheets or the like with a stapler 47, and sending them into the envelope. Fulfill.

The SSP device 3 includes a plurality of paper stacking bins 35 for stacking paper sheets, a horizontal transport path 41 for discharging the paper discharged from the apparatus main body 1 onto the paper discharge tray 22, and the horizontal transport path 41. A vertical transport path 4 for transporting a sheet or the like guided downward by a switching claw 21 provided in
2 and the paper fed into the vertical conveyance path 42 into the bin 35
It is configured by the SSP unit 40 or the like that selectively discharges upward.

The SSP unit 40 is moved up and down between the bins by an elevating device 43 including a motor, upper and lower pulleys, and a drive belt stretched between the pulleys. The SSP unit 40 forms an image in the apparatus body 1. As shown in FIG. 6, a sorting guide section 44 serving as a sorting and discharging unit for sorting and discharging the formed sheets P into each bin 35, and the sheet P on the bin 35 provided below the sorting guide section 44 by an envelope chuck section 45. It is configured by a pack unit 46 that is a means for loading into an envelope to be held, a stapler 47 that is integrally attached to the pack unit 46, and the like.

The vertical conveying path 42 is provided with pulleys 4 provided above and below.
A conveying belt 48 and the like is rotatably stretched between 9, 49 (the lower side cannot be seen in FIG. 6), and a feeding belt 50 is provided so as to contact the conveying belt 48. The feeding belt 50 has one end fixed to the upper end of the frame 51 of the SSP unit 40, and the other end fixed to a take-up roller 52 rotatably attached to a fixed portion of the apparatus body, and the arrow of the roller is fixed. It is adapted to be wound by rotation in the direction B shown.

The take-up roller 52 is constantly biased by a spring (not shown) in the direction of the arrow B for taking up the pay-out belt 50, and as the SSP unit 40 moves vertically. The feeding belt 50 is fed and wound, and a predetermined tension is constantly applied to the feeding belt 50 so that a vertical conveyance path is formed between the feeding belt 50 and the conveyance belt 48 without sagging.

The sort guide section 44 puts the paper P into each bin 3
This is a device for sorting (sorting) into five, and rotating parts 53a, 54a are formed near the lower ends of a pair of sort guides 53, 54 in which plate-like members are both formed in an arc shape. Each movable guide portion on the upper side of 54a is made rotatable in the direction of arrow C, and the movable shaft of the solenoid 55 is attached to each movable guide portion. I am trying to move to the position shown by the virtual line.

The rotating portion 53 of the sort guides 53, 54.
The respective end portions below a and 54a are fixed to the frame 51, respectively, and the paper discharge roller pair 56 is inserted into the notch groove formed therein without interference.

As shown in FIG. 7, the lower sort guide 54 is provided with a notch groove 54b which can receive a plurality of conveyor belts 48 arranged at substantially equal intervals in the front-rear direction without interfering with each other. Therefore, even when the sort guide 54 is in the position shown by the solid line in FIG. 6, the drive of the conveyor belt 48 is not affected.

When the sheets P are sorted into the bins 35, the sorting guide section 44 moves downward by the transport belt 48 of the vertical transport path 42 because the solenoid 55 remains off as shown in FIG. The conveyed paper P is sent between the sort guides 53 and 54 at the positions shown in the drawing, and the paper P is designated by the paper discharge roller pair 56 in the bin 3.
5 is discharged.

Further, since the sheet conveyed to the vertical conveying path 42 is an envelope, and when the sheet is conveyed to the envelope chuck portion 45, the solenoid 55 is turned on this time, so that both sort guides 53 and 54 are shown in FIG. Rotating part 53 at the position shown
a, 54a is rotated to retract from the vertical transport path,
The rear surface (lower surface) of the sorting guide 54 located on the lower side and the transport belt 48 form a transport path for transporting the envelope downward. Therefore, the envelope Pf transported downward in the vertical transport path 42 is transported to the envelope chuck portion 45 by the transport belt 48.

As shown in FIG. 10, the envelope chuck portion 45 is composed of a pair of chuck rollers 59 and 60 (which may be rollers) which are rotatable in pressure contact with each other in the upward and downward directions. Envelope guides 57 and 58 for guiding the envelope Pf are provided in the nip portion of the rollers, and an envelope detection sensor 62 disposed upstream of the nip portion in conveyance.
A part of the unsealing mylar 61 serving as an elastically deformable sheet-shaped unsealing member is brought into contact with a part of the chuck roller 60 on the lower side thereof. Then, these parts are attached to the frame 51 (FIG. 6) in the unit state and move up and down together with the sort guide portion 44.

The opening mylar 61 is arranged at a position where the envelope can be opened by partially inserting it into the opening of the envelope Pf held by the chuck rollers 59 and 60.

The chuck rollers 59, 60 are arranged in a substantially vertical direction and are in pressure contact with each other. Further, the envelope guides 57 and 58 guide the envelope Pf to a position where the paper is transferred from the vertical transport path 42 and guide it to the nip portion between the chuck rollers 59 and 60, and reach the chuck rollers 59 and 60. Is guided further downward, and at that time, the envelope is guided substantially along the lower chuck roller 60.

The unsealing mylar 61 is formed of, for example, a thin film-shaped resin material, which is disposed in the vicinity of the chuck roller 60 and fixed at the upper end side thereof. Although the lower chuck roller 60 is brought into contact with the lower chuck roller 60 with a predetermined pressing force by the elastic force of the material itself, when the sheet is guided into the envelope, the lower end 61a side is opened at the opening of the envelope as shown in FIG. The sheet P is inserted into the Pon and is guided by the pack unit 46 into the opening Pon.

The envelope chuck portion 45 guides the envelope Pf between the chuck rollers 59 and 60 by the envelope guides 57 and 58 when the envelope Pf is conveyed downward by the conveyor belt 48 as shown in FIG. . Then the envelope P
f is sent between the chuck roller 60 and the unsealing mylar 61 as shown in FIG. 10 by the conveying force of the chuck rollers 59 and 60 which rotate in the directions shown in FIG.

Then, the flap (envelope charge) P of the envelope Pf
As shown in FIG. 11, the fc part is chuck rollers 59, 60.
Sensor 62 when they are in a position of being held by each other.
Detects the passage of the end of the flap Pfc, the chuck rollers 59, 60 stop rotating and the envelope Pf stops. At this time, the opening Pon of the envelope Pf is located below the lower end 61a of the opening mylar 61, as shown in FIG.

Next, the chuck rollers 59 and 60 start reverse rotations in the direction of arrow E, respectively, and the envelope Pf switches back to move up the vertical conveying path 42. At that time, since the lower end side of the opening mylar 61 is in contact with the flap Pfc portion of the envelope by its own elastic force, the lower end 61a of the opening mylar enters the opening Pon of the envelope as shown in FIG. In this state, the reverse rotation of the chuck rollers 59 and 60 is stopped and the rise of the envelope Pf is stopped.

Therefore, the envelope Pf is set in the opened state in which the lower end 61a of the opening mylar 61 is inserted into the opening Pon of the envelope Pf as shown in FIG. As shown in FIG. 6, the pack unit 46 includes an upper pack portion 63 and a lower pack portion 64, and an upper roller 65 is provided on the upper pack portion.
The lower roller 66 is rotatably attached to the lower pack portion.

Further, insertion guides 67 and 68 are rotatably attached to the right end sides of the upper and lower pack portions 63 and 64 in the figure, and they are urged by a weak spring so that the front end sides approach each other. When the bundle of sheets P pass therethrough, they are pushed open so that the sheets can be conveyed without receiving a great resistance.

The pack unit 46 is shown in FIG.
As shown in FIG. 4, a pair of front and rear portions are provided so as to sandwich the bottle 35, and the notch portions 35b on both sides are formed by notching the bottle fence 35a formed at the rear end side (right side) of the bottle 35,
The inside of 35c can be moved up and down by a mechanism which will be described later, and as shown in FIG. 15, the paper P on the bin 35 can be held between a pair of upper rollers 65 and lower rollers 66 on both sides thereof. It is like this.

Each pack unit 46 is shown in FIG.
Is attached to the pack bracket 69 shown in FIG. 1 and can be rotated in the arrow F direction to a position indicated by an imaginary line in FIG.

Further, the pair of pack units 46
Are provided so that they can approach and separate from each other by a mechanism using a rack and a pinion, and can be retracted to the outside from the notches 35b and 35c of the bin 35 in FIG. The upper and lower pack parts 6 in FIG.
The upper roller 65 and the lower roller 66 can be moved toward and away from each other by closing and opening the spaces between 3, 64.

The pack units 46, 46
Whenever the paper P is discharged onto the bin 35, the paper P
It plays the role of a side jogger that approaches the paper from both edges and positions the paper with the central reference.

Further, the sheet of paper centered at the center is clamped between the upper and lower rollers 65 and 66 by bringing them close to each other.
The upper and lower rollers 65 and 66 are respectively rotated in the direction of approaching the bin fence 35a, and the edges of the sheets are aligned until the edges of the sheets abut the bin fence 35a. That is, it also plays a role as an end jogger.

FIG. 16 is a perspective view showing the main part of the pack unit 46. The upper roller 65 is built in the upper pack portion 63 and exposes only the lower portion thereof. Further, the lower roller 66 is incorporated in the lower pack portion 64 and exposes only the upper portion thereof. Moreover, the pack part 63
Has a female screw portion 63a formed in the vertical direction by projecting a part of the side surface, and the female screw portion 63a is provided with a vertical feed screw 7a.
The two are engaged.

A worm wheel 73 is fixed to the lower end of the vertical feed screw 72, and a worm 77 fixed to the rotary shaft of the motor 74 is engaged therewith as shown in FIG. Although not shown in FIG. 16, the vertical feed screw 72 is rotatably supported by the lower pack portion 64.

Therefore, when the motor 74 is rotated in both forward and reverse directions, the upper pack portion 63 moves up and down together with the upper roller 65. The upper roller 65 has a rotating shaft 75A as shown in FIG.
Is fixed to one end thereof, and its rotating shaft 75A is rotatably attached to the upper pack portion 63. Similarly, the lower roller 66 is fixed to one end of the rotary shaft 75B as shown in FIG. 18, and is rotatably attached to the lower pack portion 64 (FIG. 16).

A gear 76 is attached to the other end of the rotary shaft 75A.
Gears 78 are fixed to the other ends of the lower rotary shafts 75B, respectively. The gear 76 meshes with the intermediate gear 79,
The intermediate gear 79 meshes with the drive gear 81.

On the other hand, the gear 78 on the lower roller 66 side meshes with the intermediate gear 82, which further meshes with the intermediate gear 83, and the intermediate gear 83 meshes with the drive gear 81. The drive gear 81 is fixed to the rotary shaft of the chuck motor 84. Since the gear 76 and the gear 78 have the same number of teeth, the chuck motor 84 always rotates at the same rotation number in the opposite directions by the rotation of the chuck motor 84.

The pack unit 46 includes a stapler 47 and a bin fence 35a as shown in a simplified form in FIG.
(FIG. 14) It is integrally attached to the side. The stapler 47 lowers the needle striking portion 19 by the rotation of the eccentric cam 18 which rotates around the shaft 17 connected by the staple motor 10 shown in FIG. Stitched staple 2
0 is driven into a sheet or the like, and the tip of the staple is bent by the curved needle seat 29 to complete the stapling operation.

The movement of the binding needle 20 to the needle outlet 38 is
The rotation of the delivery belt 37 is performed, and the delivery belt 37 is stretched between the delivery pulley 34 and the pulley 39 to which the rotational force of the staple motor 10 is transmitted via a reduction gear (not shown).

The rotary shafts 75A and 75B for supporting the upper and lower rollers 65 and 66, respectively, are vertical guide grooves 69 formed on the vertical surface of the pack bracket 69 as shown in FIG.
Each gear group that is movably fitted in a and meshes with the gear 76 fixed to one end of the rotary shaft 75A, that is, the intermediate gear 79 and the drive gear 81 are rotatably attached to the upper gear support plate 85 together with the gear 76. By being supported, the rotational force from the drive gear 81 is smoothly transmitted to the gear 76.

Further, the intermediate gears 82 and 83 and the drive gear 81, which mesh with the gear 78 fixed to one end of the lower rotary shaft 75B, are also rotatably supported on the lower gear support plate 86 together with the gear 78. The rotational force from the drive gear 81 is smoothly transmitted to the gear 78. The drive gear 81 is rotated in both forward and reverse directions by a motor (not shown), and a shaft 87 that fixes and supports the central portion of the drive gear 81 is movably fitted in a horizontal guide groove 69b formed in the pack bracket 69.

Therefore, the pack unit 46 is
Motor 74 mounted on pack bracket 69
When (Fig. 16) is rotated, the vertical feed screw 72 rotates via the worm 77 and the worm wheel 73, and the upper pack portion 63 in which the female screw portion 63a engages the vertical feed screw 72 moves up and down.

At this time, when the gear 76 moves up, the gear 76 and the drive gear 81 are connected by the upper gear support plate 85, so that the drive gear 81 moves in the horizontal guide groove 69.
b in the direction of arrow G, the lower gear 78 connected to the drive gear 81 by the lower gear support plate 86 moves downward in the vertical guide groove 69a, and the rotary shaft 75B moves. It descends with the lower roller 66.

When the motor 74 rotates in the direction in which the upper pack portion 63 descends, the upper and lower gears 76 and 78 approach each other and the drive gear 81 moves in the direction of arrow G, contrary to the above case.
And move in the opposite direction. In the pack unit 46, a shaft 71 is horizontally inserted into a lower portion of a pack bracket 69, and the entire unit is movable in the arrow K direction along the shaft 71. Similarly, the pack unit 4 on the other side facing each other is also movable.
6 (see FIG. 15) is also movable.

Both ends (only one side is shown in FIG. 20) of the shaft 71 are fixed to the moving frame 91.
The moving frame 91 has a guide rod 92 that is vertically fixed to the apparatus main body fixing portion, and has holes 91b formed in the overhanging portions 91a at both ends so as to be vertically movable, and one side edge of the overhanging portion 91a. Is fixed to a part of a drive belt 93 that is stretched between upper and lower pulleys 94 (only the upper side is shown) that constitutes the lifting device 43 that is rotatably attached to the apparatus main body fixing portion.

Therefore, the pack unit 46 moves up and down integrally with the moving frame 91 by rotating the drive belt 93 in both forward and reverse directions, and the moving frame 9 moves.
Since the sort guide portion 44 and the envelope chuck portion 45 described in FIG. 6 are also attached (or may be directly) to the frame 1 via the frame 51, all of them move up and down as a unit. Further, in the pack unit 46, the pack bracket 69 is rotatable about the shaft 71 as a fulcrum by a predetermined angle in a direction indicated by an arrow F in FIG.

The mechanism for rotating the pack bracket 69 is, for example, one end of a link rod which is connected to a rotary plate fixed to a rotary shaft of a motor and which moves linearly is connected to the pack bracket 69 by using a ball joint or the like. By moving the link rod, the pack bracket 69 is rotated about the shaft 71 as a fulcrum,
A spline is formed in the entire range of movement of the pack bracket 69 of the shaft 71, a spur gear is fixed to the shaft end, the driving force is transmitted to the gear, and the shaft 71 is rotated to rotate the pack bracket 69. It can be done by a mechanism for making it.

The movement of the pack unit 46 in the direction of arrow K in FIG. 20 is performed by driving the drive wire 96 stretched between the pulleys 95, 95 (only one of which is shown) rotatably attached to both ends of the moving frame 91. Part of the wire 96 is fixed to the pack bracket 69, and the wire 96 is rotated in both forward and reverse directions by a jogger motor (not shown).

Next, the upper and lower rollers 65 and 66 are shown in FIG.
This will be described with reference to FIGS. The upper roller 65 is shown in FIG.
As shown in Fig. 22, a cylindrical rubber 97 is fixed to the outer circumference of the rotary shaft 75A to have an outer diameter of D1, and a plurality of annular urethane 98 are wound around the outer circumference at intervals as shown in Fig. 22. It is fixed.

Further, as shown in FIG. 23, the lower roller 66 has a cylindrical rubber 99 fixed to the outer periphery of the rotary shaft 75B so that its outer diameter is D2. The outer diameters D1 and D2 are substantially the same, and D1 is set so that the distances (radius) R1 and R2 from the center of each roller to the paper surface are R1 = R2 under the following conditions.
, D2 are set.

That is, when the paper P is conveyed, as shown in FIG. 24, the upper roller 65 and the lower roller 66 move in a direction in which they approach each other, and a predetermined pressure is applied to the paper P in the "feed mode position". Positioned on the paper P
Are conveyed in the direction of the arrow. At this time, the paper 9 has urethane 9
The relationship between the radius R1 of the upper roller 65 and the radius R2 of the lower roller 66 when the portion 8 is pressed and deformed is R
The outer diameters D1 and D2 of the upper and lower rollers 65 and 66 are set so that 1 = R2.

By the way, the positions of the upper roller 65 and the lower roller 66 include an "approach mode position" in addition to the above-mentioned "feed mode position". Each of these positions corresponds to the upper pack portion 63 and the lower pack portion 6 shown in FIG.
4 position, which is determined by the rotation amount of the motor 74.

The "shift mode position" and the "feed mode position" differ depending on the number of sheets of paper on the bin, but the amount of rotation of the motor 74 corresponding to the number of sheets of paper is controlled by the controller each time. The optimum position can always be obtained by reading the data stored in the ROM, which indicates the relationship between the number of sheets and the rotation amount.

When the pack mode for inserting paper or the like into the envelope is selected, the pack units 46, 46 are rotated by the motor 74 (FIG. 16) at the positions shown in FIG. The lower rollers 65 and 66 come close to each other, and the sheet P (state of the sheet bundle when stapled) is sandwiched and fixed between them.

Next, the drive belt 93 shown in FIG. 20 is rotated in the direction of the arrow M to raise the pack unit 46, and the lower surface of the sandwiched paper P is placed on the bin fence 35a of the bin 35 as shown in FIG. When the position exceeds the upper end, the ascending is stopped.

After that, as shown in FIG. 26, the pack unit 46 is rotated about the shaft 71 so that the insertion guides 67 and 68 on the front end side are opened in the envelope chuck portion 45 described with reference to FIGS. 12 and 13. The Pon is moved to the opening Pon of the envelope Pf in the opened state, and the insertion guide 6
7, 68 are moved to the upper part of the opening mylar 61 or inside the opening Pon of the envelope.

In this state, the upper roller 65 and the lower roller 66 of the pack unit 46 are moved in the directions shown by the arrows in FIG.
27, and the paper P held between them is inserted into the envelope Pf as shown in FIG.

As described above, in this embodiment, the envelope Pf is guided to the position where the sheet is transferred by the envelope guides 57 and 58, and it is held by the chuck rollers 59 and 60, and the envelope Pf in the holding state is held. The lower side of the opening mylar 61 is inserted into the opening Pon, and the paper P transported by the pack unit 46 is inserted into the opening of the envelope Pf.

FIG. 28 is a plan view showing the main part of the operation panel 100 provided with various operation keys used for selecting various modes and setting various copy conditions. On the operation panel 100, a package key 101 to be pressed when selecting a pack mode for automatically packing the paper in the envelope to the upper right in FIG. 28, and a sort for sorting the copied paper and ejecting it onto the bin 35. A sort key 102 to be pressed when selecting a mode and a staple key 103 to be pressed when selecting a staple mode for binding sheets on the bin 35 are provided, and sheets can be packed in an envelope on the left side thereof. A display unit 104, which is an envelope size display unit for displaying the envelope size or an envelope that can be packed, is provided.

Below the package key 101,
Ten numeric keys 105 are provided for instructing the number of copies and for selecting the document circulation mode in which the circulation type automatic document feeder 2 replaces the next document each time the document exposure is completed. A stop / clear key 106 is provided on the lower side, an enter key 107 is provided on the right side of the stop / clear key 106, and a start key 108 to be pressed to start copying is provided on the stop / clear key 106.

Further, below the display unit 104, the paper
Envelope selection keys 109a to 109e, an illustration depicting each tray corresponding to each of the five selection keys, and a paper / envelope display unit 110 below which two left and right lamps are arranged are provided. If the selected one is an envelope, the lamp on the right side of the envelope lights up in green and the envelope size is displayed below it.

When the selected one is a sheet (transfer sheet), the lamp on the left side thereof lights in orange and the sheet size is displayed below the lamp. A key provided below the paper / envelope selection key 109e is an envelope selection mode switching key 111, which is used to automatically select an envelope of an optimum size when packing the sheets on the bin 35 with an envelope and an operator. Press to select a mode that allows you to choose the envelope size freely.

By the way, in this copying machine, as described with reference to FIG. 1, the paper is collated with the envelope size capable of accommodating the paper fed from the paper feed section 11 and the envelope set in the apparatus main body 1. If there are multiple envelopes that can be stored,
The first mode in which the smallest size envelope is automatically selected and all envelopes of the storable size are displayed on the display unit 1.
The second mode displayed at 04 can be selected by pressing the envelope selection mode switching key 111 (FIG. 28).

The first mode is automatically selected when the power is turned on by the main switch 70 or when the mode is cleared. Further, if there is no envelope having a size capable of accommodating a sheet by the above collation, it is automatically displayed on the display unit 104.

All of these controls are performed by the controller 120 shown in FIGS. That is, in this embodiment, the control device 120 controls each size detection sensor 32.
And each size detection sensor as recognition means for recognizing the envelope size capable of accommodating the size of the paper detected by the size detection device 30 (paper size detection means) and also as the envelope size recognized by this recognition means and the envelope size detection means. 32 and the envelope detection unit 30 respectively function as a collation unit that collates with the envelope size detected. In addition, the control device 120 serves as means for automatically selecting the first mode when the device is powered on or when the mode is cleared.
Further, when there is no envelope of a size capable of accommodating a sheet in the collation by the collating means, it also functions as a means (control part) for displaying it.

FIG. 29 is an overall control block diagram showing the control unit 120 and its related configuration. This control device 1
Reference numeral 20 includes a main control board 130 for controlling the image forming system in the apparatus main body 1, and an SSP control board 140 for controlling operation of sorting, stapling, packaging and the like.

The main control board 130 includes various processing programs including a central processing unit (CPU) having various judgment and processing functions and programs necessary for controlling various drive systems in the apparatus main body 1 (FIG. 2). And a ROM that stores fixed data, a RAM that is a data memory that stores processed data, and an input / output circuit (I / O).

In the ROM, for example, a sheet / envelope size compatibility table as shown in Table 1 is stored. This compatibility table is a matrix table in which each paper size and each envelope size are taken as parameters, and each envelope size and each paper size suitability (whether the paper can be stored in the envelope),
The number of sheets that can be stored in each envelope size and the optimum envelope size data for each sheet size are stored.

[0087]

[Table 1]

Note that Table 1 is the paper / envelope size compatibility table 1
This is an example, and a compatibility table for another envelope size is also stored. The main control board 130 includes a paper size or an envelope size from the size detection sensors 32 provided in the paper feed cassettes 15A to 15D (FIG. 1) of the paper feed unit and the size detection device 30 provided in the tray 24. In addition to inputting the sensor signals output corresponding to each, the sensor signals are input from other sensors such as other synchronization detection sensors and paper end sensors, and various discharge devices, developing motors, high voltage power supplies, polygon motors, The timing for turning on / off various loads such as the semiconductor laser of the writing unit 6, the fixing device, and the motor for driving the photoconductor is determined, and the entire sequence operation is performed.

Further, the main control board 130 is
Various keys provided on the operation panel 100 (FIG. 28), the scanner control board 122, the RDH control board 12
3 and are further connected to the personal computer 125 via the external interface 124. Two-way communication is possible with each of these control boards to exchange commands.

The scanner control board 122 and the external interface 124 also receive image data output.
The SSP control board 140 has a central processing unit (C) that has various judgment and processing functions like the main control board 130.
PU), a ROM storing each processing program including programs necessary for controlling various drive systems in the SSP device 3 (FIG. 2) and fixed data, and a RAM serving as a data memory storing the processing data. It is composed of an input / output circuit (I / O).

The SSP control board 140 is
It is connected to the main control board 130, serial communication is possible between them, and it operates according to a command sent from the main control board 130. This SSP control board 140 is equipped with an envelope detection sensor 62 (see also FIG. 6), home position sensors for detecting the vertical and horizontal home positions of the SSP unit 40, and a storage carrier 4 (see FIG. 2). Various detection signals are input from each sensor such as a sensor that detects the state and a sensor that detects an envelope or the like that has failed to be discharged into the storage carrier 4.

Then, the motor 14 for rotating the pulley 49 on which the conveyor belt 48 constituting the vertical conveyor path 42 is stretched.
1, a conveyor belt driving driver 142, a chuck roller driving driver 144 for rotating a chuck roller driving motor 143 of the envelope chuck section 45, and a pair of pack units 46, 46 according to the size of the paper on the bin 35.
The drive signals are output to the jogger drive driver 146 that drives the motor 145 that moves the motors closer to and away from each other.

Further, a unit elevating driver 148 for rotating a motor 147 for raising and lowering the SSP unit 40 (FIG. 6), for holding the paper on the bin 35 between the upper roller 65 and the lower roller 66. Motor 74
A drive signal is output to each of the motor drive driver 149 that drives the motor and the motor drive driver 151 that drives the chuck motor 84 that rotates the upper and lower rollers 56 and 66.

Further, the SSP control board 140 is
Carrier motor drive driver 154, which drives a motor 152 for moving the positions of a large number of vertical bins provided in the storage carrier 4 to eject an envelope filled with paper onto a desired vertical bin, stapler 47 (Fig. 1
9) The drive signal is output to each driver of the stapler drive driver 153 that drives the staple motor 10 that operates 9).

By the way, in this digital copying machine, the envelope automatic selection mode (first mode) and the envelope operator selection mode (second mode) can be selected as described above. Therefore, when the operator presses the envelope selection mode switching key 111 and the package key 101 in FIG. 28 to select the pack mode, the automatic envelope selection mode is set, and the mark “appropriate” in Table 1 is added according to the size of the fed paper. Envelopes of the specified size are automatically selected appropriately.

That is, the paper (transfer paper) size is automatically selected according to the size of the original to be copied, or the operator selects the paper / envelope selection key 1
Envelopes with the "appropriate" mark in Table 1 are selected according to the paper size selected from 09a to 109e (FIG. 28).

Then, if there is no envelope of the size of the "appropriate" mark (envelope of the minimum size capable of accommodating paper), the envelope of one rank larger than that is automatically selected. Further, if there is no envelope of a size capable of accommodating the paper, the display unit 104 of FIG. 28 displays "No envelope for packaging is set" and the pack mode is automatically released.

When the pack mode and the stack mode are selected and the number of copies is input by the ten keys 105 of FIG. 28, the size of the paper and the number of copies to be used are collated according to the paper / envelope size compatibility table of Table 1, and the table is displayed. When the number of copies that is equal to or more than the number of copies shown is input by the ten-key pad 105, the display unit 104 displays "too many copies cannot be packaged", and the pack mode is automatically canceled.

When the pack mode and the sort mode are selected, "Enter the number of originals" is displayed on the display unit 104. Therefore, when the operator inputs the number of originals with the ten keys 105 and the enter key 107, the sheet / envelope size compatibility table of Table 1 is collated again, and when the number of originals equal to or more than the number shown in the table is input, the "original I can't package because there are too many. "
Pack mode is automatically released.

On the other hand, when the envelope operator selection mode is selected by operating the envelope selection mode switching key 111, the paper size automatically selected according to the original size or the paper selected by the operator is selected as in the envelope automatic selection mode. In accordance with the size, the paper / envelope size compatibility table of Table 1 is searched for envelope sizes that can store the paper in the envelope, and all the applicable envelope sizes are displayed on the display unit 104. For example, when the paper size is A4, the display unit 104 displays “Select envelope size 24 × 33 or 27 × 38”.

Further, in the envelope operator selection support mode (for example, pressing the envelope selection mode switching key 111 twice) provided in this copying machine, when the operator selects the pack mode, each of the above As in the selection mode, the packable envelope size is searched from the paper / envelope size compatibility table in Table 1 according to the paper size automatically or by operator selection, and the packable envelope size is set among the envelope sizes set in the device body. The possible envelope sizes are collated, and the illustrations drawn on the paper envelope display unit 110 of FIG. 28 corresponding to all the paper feed cassettes or trays storing the matched envelope sizes are blinked.

Therefore, the operator can freely select the envelope to be used from the blinking envelope sizes. However, when there is no packable envelope size according to the paper size in the paper / envelope size compatibility table in Table 1, or there is no envelope size that can pack the paper among the envelope sizes set in the apparatus body. At this time, the display unit 104 displays "Packaged envelope is not set" and the pack mode is automatically released. The envelope operator selection support mode may be the second mode. In that case, the envelope size display unit becomes the paper envelope display unit 110.

Further, in this copying machine, when the power is turned on or the mode is cleared, the envelope automatic selection mode (first mode) is set. 30 and 31 show
It is a flowchart which shows the routine regarding the envelope selection process which the control device 120 performs, and the control device 120 repeatedly executes this routine at a predetermined timing.

When the routine shown in FIG. 30 is started, it is first determined in step 1 whether or not the first mode, that is, the envelope automatic selection mode is selected, and if it is selected, the process proceeds to step 2 but it is selected. If not, the process proceeds to step 3 to determine whether or not the second mode, that is, the envelope operator selection mode is selected.

If it is determined in step 3 that the second mode is selected, the process proceeds to step 4 in FIG. 31. If it is not selected, the process proceeds to step 5 and the envelope operator selection support mode is selected. If it is not selected, the process returns to the main routine. If it is selected, the process of the envelope operator selection support mode described above is executed in step 6, and when it is completed, the process returns to the main routine. To do.

On the other hand, when the first mode is selected and the process proceeds from step 1 to step 2, the automatic paper selection or the operator selects the paper / envelope selection keys 109a to 109e.
By pressing (FIG. 28), it is determined whether or not the selected paper size is smaller than or equal to B5 size, and if so, the process proceeds to step 7 and B5 marked with “appropriate” described in Table 1. Envelope C (envelope size is 21.5 × 27.5 in the case of Table 1) of the smallest size that can accommodate the size paper is automatically selected and displayed on the display unit 104. Please select 5 × 27.5 ”.

If the paper size is not B5 size or less and the process proceeds to step 8, it is determined whether the selected paper size is the A4 size. If not, the process proceeds to step 9. If so, proceed to step 10 and set the minimum size envelope B capable of accommodating the A4 size sheet with the “appropriate” mark in Table 1 (in the case of Table 1, the envelope size is 24 × 33). Automatically select it and display it on the display 104. "Please select 24x33 for envelope size."
Is displayed.

If the paper size is not A4 size and the process proceeds to step 9, it is determined whether the paper size is B4 size. If not, the process proceeds to step 11, but if not, the step Go to No. 12 and see “Appropriate” in Table 1.
Envelope A of the smallest size that can store B4 size paper with a mark (in the case of Table 1, the envelope size is 27
(X38) will be automatically selected and displayed on the display unit 104 as "Please select 27x38 for the envelope size".

If the paper size is not B4 size and the process proceeds to step 11, it is judged whether or not the selected paper size is larger than B4, and if not, the process returns to the main routine. However, if so, the process proceeds to step 13 to display "Unable to package" on the display unit 104 and then returns to the main routine.

On the other hand, when the second mode is selected and the process proceeds to steps 1 → 3 → 4 (FIG. 31), it is determined whether or not the selected paper size is B5 size or less, If not, the process proceeds to step 14, but if so, the process proceeds to step 15 to display the envelopes A, B, and C of all sizes shown in Table 1 that can accommodate the B5 size paper on the display unit 104.

If the paper size is not B5 size or less and the process proceeds to step 14, it is determined whether the selected paper size is the A4 size. If not, the process proceeds to step 16. If so, the process proceeds to step 17 to select the envelopes A and B capable of storing the A4 size paper in Table 1 and display the same on the display unit 104 "Envelope size is 24 × 33.
Or select 27 × 38 ”.

If the paper size is not A4 size and the process proceeds to step 16, it is judged whether or not the paper size is B4 size, and if not, step 18
If so, proceed to step 19 and go to B4 in Table 1.
An envelope A capable of storing a sheet of size is selected and displayed on the display unit 104 as "Select envelope size 27 × 38".

If the paper size is not B4 size and the process proceeds to step 18, it is determined whether or not the selected paper size is larger than B4, and if not, the process returns to the main routine. If so, proceed to step 20, display "Unable to package" and return to the main routine.

[0114]

As described above, according to the present invention, the following effects can be obtained. According to the invention of claim 1, if the operator selects the first mode, there is no need to worry about the size of the envelope to be used when packing the envelopes, so that the envelope can be automatically packed with good operability, The packed envelopes also look great because they are the optimal size.
Further, if the second mode is selected, all envelopes of a size capable of accommodating sheets are displayed on the envelope size display section, so that the operator can freely select the envelope size to be used, which is convenient. .

According to the second aspect of the invention, since the first mode is automatically selected when the power is turned on or when the mode is cleared, the operator does not perform an envelope selecting operation when the power is turned on or the mode is cleared. However, the operability is good because the envelope size that is suitable for the paper to be used is automatically selected.
According to the invention of claim 3, when there is no envelope of a size capable of accommodating the used paper, it is displayed,
Since the operator can immediately know that there is no envelope, the dead time can be reduced and the operability is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a size detection system for detecting sizes of a sheet and an envelope, which are essential parts of an image forming apparatus according to the present invention, and a control system for inputting a detection signal from the size detection system.

FIG. 2 is an overall configuration diagram showing a digital copying machine as the image forming apparatus.

FIG. 3 is a perspective view showing a paper feed cassette mounted in the paper feed unit 11 of the digital copying machine.

FIG. 4 is a perspective view showing a state where envelopes are set in the tray 24 of the digital copying machine.

FIG. 5 is a side view of the same.

6 is an enlarged configuration diagram showing an SSP unit 40 of the digital copying machine of FIG.

FIG. 7 is a perspective view showing the positional relationship between the sort guide 54 and the conveyor belt 48 of the SSP unit 40.

FIG. 8 is an explanatory view showing a manner in which the sheet is discharged onto the bin by the sort guide portion of the SSP unit 40.

FIG. 9 is an explanatory view showing how the envelope is conveyed to the envelope chuck portion 45 in the SSP unit 40.

FIG. 10 is a configuration diagram showing the envelope chuck portion 45 of the same.

FIG. 11 is an explanatory view showing a state in which the envelope chuck portion 45 holds the envelope with the opening Pon below the lower end of the opening mylar 61.

FIG. 12 is an explanatory view showing a state in which the lower end of the opened mylar 61 has entered the same envelope.

FIG. 13 is a perspective view showing a state where the opened mylar is also inserted.

14 is a perspective view showing a positional relationship between a pack unit 46 and a bin provided in the SSP unit 40 of FIG. 1 as a pair.

FIG. 15 is a front view showing the positional relationship between the pack unit 46 and the bin.

FIG. 16 is a perspective view showing the main part of the pack unit 46 of the same.

FIG. 17 is a plan view of the pack unit 46 of the same.

FIG. 18 is a perspective view showing a drive system for respectively driving the upper and lower rollers of the pack unit 46.

19 is a configuration diagram showing a stapler provided in the SSP unit 40 of FIG.

FIG. 20 is a perspective view showing the SSP unit 40 and a drive system for moving the unit.

21 is a schematic diagram showing an upper roller 65 of the pack unit 46 of FIG.

FIG. 22 is a perspective view showing an upper roller 65 of the same.

23 is a schematic view showing a lower roller 66 of the pack unit 46 of FIG.

FIG. 24 is a schematic view showing a state in which the paper is sandwiched between the upper roller 65 and the lower roller 66.

FIG. 25 is a schematic view showing a state where the lower surface of the sheet held by the pack unit 46 in FIG. 16 has risen to a position beyond the upper end of the bin fence 35a.

FIG. 26 is an explanatory diagram for explaining a manner in which the pack unit 46 also grips a sheet and moves to a position where the sheet is inserted into the envelope.

FIG. 27 is an explanatory diagram showing a state in which the pack unit 46 is similarly inserting the sandwiched paper into the envelope.

28 is a plan view showing a main part of an operation panel 100 provided in the digital copying machine of FIG. 1. FIG.

FIG. 29 is a control device 1 which also controls the entire copying machine.
20 is a block diagram showing 20 and related configurations. FIG.

FIG. 30 is a flowchart showing a part of a routine relating to envelope selection processing, which is also executed by the control device 120.

FIG. 31 is a flowchart showing the processing after step 4 of the routine relating to the envelope selection processing.

[Explanation of symbols]

1 Device Main Body 3 SSP Device (Post-Processing Device) 11 Paper Feeding Section 15A to 15D Paper Feeding Cassette (Paper Storage Section) 30 Size Detection Device 32 Size Detection Sensor 35 Paper Loading Bin 44 Sorting Guide Section (Assortment Ejection Means) 45 Envelope Chuck Parts 46 Pack Unit 70 Main Switch 100 Operation Panel 104 Display (Envelope Size Display) 111 Envelope Selection Mode Switching Key 120 Control Device P Paper Pf Envelope

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazunori Sakauchi             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh

Claims (3)

[Claims] 1. A plurality of sheet stacking bins for stacking sheets,
Assortment discharging means that sorts and discharges the sheet, which is fed from the sheet storage section and on which the image is formed, into each of the sheet stacking bins,
In an image forming apparatus provided with a means for carrying the paper on the paper stacking bin into an envelope, a paper size detecting means for detecting the size of the paper fed from the paper storage section, and Envelope size detecting means for detecting the size, an envelope size display section for displaying the size of the envelope detected by the means, and recognizing means for recognizing the envelope size capable of accommodating the paper of the size detected by the paper size detecting means. And collating means for collating the envelope size recognized by the means with the envelope size detected by the envelope size detecting means, and when there is a plurality of envelopes of a size capable of accommodating sheets by the collating means, A first mode in which the smallest size envelope is automatically selected, and a second mode in which all envelopes of the storable size are displayed in the envelope size display section. An image forming apparatus wherein a and. 2. The image forming apparatus according to claim 1,
An image forming apparatus comprising means for automatically selecting the first mode when the power is turned on or when the mode is cleared. 3. The image forming apparatus according to claim 1 or 2, further comprising means for displaying an envelope having a size capable of accommodating sheets when the collating means collates the sheet. Image forming apparatus.