JPS5936042A - Feed attachment and image forming device with said feed attachment - Google Patents

Abstract

PURPOSE:To reduce the weight of a device by providing a positioning section determining the fitting position to a device main body on the side where the separation member of the device main body is provided when a sheet feed attachment separate from a copying machine main body is removably fitted to the main body. CONSTITUTION:A rail 20b provided at a precise distance from a positioning recessed section 45a for a copying machine main body 1 and an attachment 20 is formed in one body on the frame body 20a of the attachment 20. A recessed section 21b formed in one body with a cassette 21 is coupled with this rail 20 portion. The cassette 21 and attachment 20 are positioned in the front and rear directions. Accordingly, the cassette 21 is loaded while being correctly positioned at the predetermined loading position of the attachment 20, the main body 1 and attachment 20 are precisely positioned, thus the cassette 21 can be loaded at the correct position to the main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a feeding attachment that is detachably attached to an image forming apparatus such as a copying machine or a recording machine, and includes a sheet stacking section and a sheet feeding means for feeding sheets from the sheet stacking section. and an image forming apparatus equipped with the feeding attachment. More specifically, the present invention relates to a feeding attachment for feeding a sheet to both image forming apparatus main bodies by a sheet feeding means in order to form an image on a sheet, and an image forming apparatus equipped with the attachment.

Hereinafter, an example will be described in which a copying machine is used as an image forming apparatus and a cassette is detachably provided as a feeding attachment.

2. Description of the Related Art Conventionally, in copying machines, there have been a manual feeding device and a continuous feeding device as a device for feeding transfer paper, depending on the type of MtK used to make copies. A manual feeder is a type of ship in which an operator manually feeds transfer paper one sheet at a time. On the other hand, the continuous feeding device it has transfer paper ff1K in the multifunction machine main body.
A transfer paper loading stand If a self-feeding device is provided, and when in use, the desired number of transfer papers is placed on the machine, and the paper is automatically separated and fed one by one to the e9, or a transfer paper of a predetermined size is prepared in advance. Store the paper in the cassette, and when using it, be sure to place the cassette containing the transfer fee for the size of the paper into the copier body.
There is a cassette feeder for sending 4 sheets one by one, and a large amount of transfer paper is loaded and stored inside the hoshaki body.
There is a deck feeding device R that feeds one sheet at a time. In addition, a long transfer paper is stored in a roll, and the transfer paper of the required size is fed out for copying.

In conventional copying machines, one of these transfer material feeding positions is installed alone, or a combination of multiple types is installed. Some machines only allow manual feeding as a transfer paper feeding method,
Capable of manual feeding and one size cassette feeding, 2
One that can feed cassettes of different sizes, or one that can feed manually and two size σ) cassettes, and one that can feed cassettes of two sizes
f) There are various types of copying equipment, such as those that can feed cassettes of different sizes and decks of one size. However, in conventional copying machines, these transfer paper feeding devices are Only equipment that had been installed from the beginning could be used. For this reason, if a low string machine is used, for example, a user who uses a machine that can only feed manually, or if the number of copies has increased and manual feeding cannot handle it anymore, the copying machine may Even if it is available,
This had to be replaced with a copying machine equipped with a fully continuous feeding device.In other words, even if the copy pile changed, another copying machine was required.On the other hand, with high-end machines, the size of the copying machine itself The size of the TV has grown to the extent that it is equipped with a k feeder.
There were problems such as it becoming stiff.

Therefore, the present invention is intended to eliminate the drawbacks of the conventional apparatus described above, and is to provide a feeding attachment that is detachably attached to the main body of the image forming apparatus. From No. C, the feeding function can be system-upped to accommodate the various copy volumes of users, and as a result, the image forming apparatus can save space and be lightweight.In other words, this book achieves the above objectives. The invention provides a sono-1 stacking section, a sheet feeding means for feeding sheets from the sheet stacking section, and a mounting position of the device main body on the side where the separating member is provided when the sono-1 loading section and the sheet feeding means are mounted on the device main body. A sheet stacking section, a sheet feeding means for feeding sheets from the sheet loading section, and a sheet feeding unit that is detachably attached to the main body of the image forming apparatus. To provide an image forming apparatus including a feeding unit which is detachably attached to the apparatus main body and has a positioning part on the side of the apparatus main body on which the separating member is provided to determine the mounting position with respect to the apparatus main body when the image forming apparatus is mounted on the apparatus main body. Next, an example of a copying machine equipped with an embodiment of the present invention will be described.

FIG. 1(a) is an external view of the copying machine main body 1.
(kl) is the old master view seen from below, and FIG. 2 is a cross-sectional view of this copy (kl).
! A document mounting table made of a transparent member such as glass, which moves back and forth in the direction of arrow a. 6 is a short focus small diameter IJ! It is a cumulate array. Then, the original beam reflected by the light beam 4 of the JfA manuscript O placed on the manuscript table 2 is slit-exposed onto the photosensitive drum 5 by this array 6.
Accordingly, the drum 5, which has been uniformly charged in advance, is subjected to image exposure by this element array B, and an electrostatic image corresponding to the original image is formed. Next, this electrostatic image is visualized by the developing device 7. - The transfer paper 9 manually fed from above the male manual feed table 8 is transferred to a feed roller 11 which rotates in response to a detection signal from a detection means 10 that detects that the transfer paper 9 has been manually fed, and onto the photosensitive drum 5. The image is sent onto the drum 5 by a registration shutter 12 that opens and closes at the appropriate timing so that the image is placed at a proper position on the transfer paper 9. Next, the toner image on the photosensitive drum 5 is transferred onto the transfer paper 9 by the transfer discharger 13. Thereafter, when transferring the toner image onto the transfer paper 9, one side edge of the photosensitive drum 5 and the transfer paper 9 11H' between the drum 5 and the transfer paper 9.
A separating belt 1 is disposed in contact with or close to one end of the drum 5 in order to separate the QWr 711 and guide the post-transfer rotation circle 0 paper 9 in a direction away from the surface of the drum 5.
The transfer paper 9 is separated from the drum 5 by a driven rotating roller 14a and a driven rotating pressure roller 14b in order to peel off the transfer paper 9 that has been guided in the direction of folding from the circumferential surface of the drum 5 by the belt 14. Guide 15
The toner 1 on the transfer paper 9 is guided to the fixing device 16 by
After the dust is fixed, the paper is discharged onto a tray 18 by a paper discharge roller 17.

Note that the toner remaining after transfer on the photosensitive drum 5 is removed by the cleaning means 19 in the next step. Also, 6o
is a pressure bonding plate, which is used to pressure the original 41 [J] onto the mounting table 2.

Now, the copying cane of this embodiment has a built-in manual feeding device that allows only one operator to insert and feed the transfer paper by hand. For:
By connecting the feeding attachment 20 to the lower part of the Neri camera body 1, continuous feeding by the cassette 21 is possible for the Ibee S. The figure is shown in No. 3r71(a), and the cross-sectional view is shown in FIG. 3 (bl) and FIG. 4 (al is
Breeding diagram showing the 4ttt structure of the attachment 20, small diagram 4 (bl is the plane shown in Show 1).

In the following, we will discuss the detachable connection method between the feeding attachment 20 and the main body 1. In the main body 1, after the toner image is transferred, the transfer paper 9 is separated from the photosensitive drum 5, and an example of the photosensitive drum 5. Since this is performed by the separation belt 14, separation roller 14a, pressure roller 14b, etc. placed at the end, the transferred transfer paper is placed at the reference position on one side of the separation belt 14, regardless of its size. It must be conveyed along a predetermined conveyance path, and f:r< (in this example, :!e' 4th ll)
&? A two-separation belt 14 is arranged, and an attachment 2 (for convenience, the position of the separation belt 14 when J is attached to the main body 1 is shown by a dot @ line in FIG. ) 20 must be connected to the main body 1 with high precision.

At least the sides on which the separation belts 1 and 4 are provided must be accurately positioned and mounted. That is,
The end of one example of the transfer paper sent out from inside the cassette 21 must be positioned and connected to the separation belt 14 reliably.

Therefore, in this embodiment, the positioning of the main body 1 and the attachment 20 is carried out as follows.

First, on the same side of the bottom box 22 on the main body 1 side, when using only the main body 1, the main body 1! Four legs 23 to be placed on the stand
a@bec* (1) is provided at the corner thereof.Here, in particular, when at least two of the leg portions 23a-d, in the embodiment, both 1 and 2o are attached, the separation belt 14 The rear leg 26b and the front 1 (sleeve leg 23a)
'The device is made with high precision from a predetermined reference position of the bottom box 22.

Also, on the 20 side (attachment), 4IJ JJ'tt
The main body 1 is placed at four corners of the casing 20a formed by K.
The recesses 45a-b and co into which the leg portions 23a-d of
d is provided.

In order to attach both at that point, attach main body 1 to attachment 2.
Posted on 0ff7. When this happens, the legs 23a to 23d fit into the recesses 45a to 45d, respectively, and the wall surface around the four parts comes into contact with the surface C around the base of the legs on the main body 1 side. More specifically, a recess 45atf that fits with the rear leg 23a provided on the side where the separation belt 14 is arranged;
The inner diameter X thereof is formed to approximately match the outer diameter Y of the leg portion 23a.

In other words, both have matching shapes and can be fitted into each other. Therefore, when the leg portion 23N and the fourth portion 45a are fitted together, there is no play between them. Also, the four parts 45 that fit with the leg part 23b of the right front It'll facing this lace part 23a.
b has a width Za that almost matches the outer diameter Zb of the leg portion 23b, and is a long hole ii1'f in the longitudinal direction tj, which is larger than the width Za. In addition, the inner diameter tt of the other two recesses 45c*a, and the fitting leg portions 23cmd.
The dimensions are thicker than the outer diameter of the two, and both can be fitted together with some margin.

Therefore, when attaching the attachment 20 to the main body 1, the trap is
First, fit the leg 23a at the back in+ into the recess 45aC]
As mentioned above, the leg 2 lower a is precisely positioned with respect to a predetermined reference position on the bottom box 22, so that
By fitting the B111 part 23u and the concave R (S45a), the main body 1 and the attachment 2U are arranged with the segmental belt 14 (i+lI is well positioned by 57 degrees). b is fitted into the elongated hole recess 45b.

At this time, since the fourth part 45b is 1 m long, even if the leg part 23b
Or installing the recess 45b (i7. Even if the position is misaligned, the leg 23b can be inserted smoothly into the four parts 45b.Moreover, the width size Za of the recess 45b and the width of the H'v part 23b Since the outer diameters Zb and t are approximately the same, once the attachment 20 and the main body 1 are attached, there is no possibility that they will come apart and cause looseness.

Further, part 45 c * d[1, u1 part 26C-d
'The IC is large enough to engage. At this time, the inner diameter of the fourth part is 45 cm, which is larger than the outer diameter of the leg 23 cm, so
Since the legs 26C-d1'i and the recesses 45C-dK can be inserted with full margin, even if there is an error in their installation positions, the main body 1 and the attachment 20 can be smoothly attached.

Therefore, in this embodiment, the leg portions 23a*b*O"d are the concave portions 4.
5a-bΦC-d, and in particular, the main body 1 is attached to the attachment member 20 so that the side on which the separation belt 14 is installed is precisely attached to the main body 1. The attachment 20 is installed smoothly and with good positioning. Also, the positioning of 1111 where the separation belt is installed,
This can be done with particularly high precision.

Attachment men? 20 right recess 45a and cassette 2
The accuracy of the distance to the loading positioning part (bale, mentioned) of No. 1 is determined by the casing of the attachment (2t).

By the above method, the main body 1 and the attachment 20 can be connected with high accuracy, and the transfer paper stored in the cassette 21 loaded in the attachment 20 with respect to the main body 1 is transferred from the cassette 21 to the correct conveyance path. is sent out, one end of which is reliably caught on the separation belt 14 during separation, and minute 1i:i# is performed without mistakes.

Note that, without being limited to the above example, for example, a convex portion or four portions may be provided using Ni other than the leg portions of the main body flll11, and an opposite concave portion or convex portion may be provided on the attachment side so that they fit together. Positioning can also be performed by

Furthermore, in the embodiment described above, incorrect attachment of the main body 1 and the attachment 20 can be prevented. 0 First, the above implementation f
In IIJ, the legs 26a- provided at two locations on the right side
Outer diameter Y-Zb of b and leg portions 2 provided at two locations on the left 11
There is a 3 cm wide outer edge, which prevents the main body 1 and the attachment 2 [) from being accidentally connected with the right and left sides reversed. Furthermore, when trying to connect both left and right in reverse, the wall 24 on the front side of the attachment 20 (II
The circumference of the main body 1 is higher than the wall, that is, it protrudes from the wall, so if you try to install it in the wrong direction, the main body 1
But it hits this front wall 24, and it turns into dirt so that Jl'7 is not attached.

Furthermore, in this embodiment, the arrangement is made in consideration of the weight when the bird is mounted.

When the main body 1 is placed on the attachment member) 20, there is a risk that the casing 20a of the attachment member) 20 may be deformed due to the weight of the main body 10. Therefore, in order to prevent this, tit No. As schematically shown in Fig. 5, the casing 2 of the attachment 2o [J]
a -b -c-d tit, , 7f (l
The part where il f is received, that is, the leg part 73 asbec of the main body 1
Four parts 45a*b*c- at four places that catch and support *d.
4. Install the washing device so that it is almost directly under the point d. Ru. That is, the leg portion 23
fl @ l) @ Q @ d and part 45 a *
b * cm (1, and leg 60aeb-am,
I#'i, each k% 1f5 one direction 1g---p L
It is placed in Therefore, when both are attached, the weight of the attachment 20 cv leg 6o8・1)・cm
Even if the receiver is fastened and held in step d, the housing 20a of the attachment 20 will not be deformed.

Above, we have discussed the mechanical connection between the copying machine body 1 and the accommodation device 2υ, but next we will briefly explain the electrical connection.

Equipment side 2 [JKii, start copying method]
y) Copy Book 25.1 t-t
=ttosurudame no autumn tt 7/II R Ho'kun 26 and sheep number n button 27, and the set wish is 1
Clearing the evening and ;! Clear/stop button 28 that has two functions: to stop the li a copy
But its own tl 17g tk work f1362 (3rd
Ea (al ・M 4 G (bJ) K tiz
5), and each signal is crushed and broken by the cedar (4 main body 1 and attachment 20/river).In the figure, the connector cut out to 29Fi attachment 201!!I Then, the four parts 45a are provided with $<
I11+1 is provided with sinking force than the upper surface of the recess 45a.And goa
, mutual (;7 main body 1 f+++ Df, 122 is a connector that protrudes downward and h′ bristle.
b negative f of connector 6o? The distance ^1t protruding downward from 22 is ff'l ill 25 a @ b e
It is made smaller than the protruding distance of CIId, thereby protecting the connector 30 from impact. In addition, these connectors 29 and 60 each have a leg portion 23 for positioning.
a and the fitting recess 45a at equal distances from each other. Therefore, when the main body 1 is attached to the attachment 20, the connectors 29 and 30 are also securely connected.

As described above, in this embodiment, the main body 1 and the attachment 20
It can be connected both in L pattern and electrically.

Next, regarding the attachment 20 of this example, FIG. 6 (at - (b), FIG. 4 (a) @ (b) + m
Detailed explanation using Figure 6 (a) - (b) and Figure 7
K ld clear.

IP, Fig. 4 (a) shows an embodiment of the attachment 20; FIG. 7 is a cross-sectional rear view showing the drive section of the embodiment. FIG. 7 is a cross-sectional view showing the cassette positioning section.

In the figure, 21 is a cassette for loading transfer paper, and can be inserted and removed through an opening 31 formed when the attachment 20 and main body 1 are attached. Transfer paper P#: is set between a swingable middle plate 32 provided in the cassette 21 and separation claws 360 provided at both corners of the feeding tip, and is pushed upward by a cassette spring 54. Then, as the half-moon-shaped paper feed roller 66 with the paper feed roller shaft 35Klil rotates 101 times in the direction of arrow A in the figure, the pressure of the cassette spring 64 increases and the transfer paper P is stacked. ! Due to the frictional force between the uppermost transfer paper and the paper feed roller 66, the shell upper transfer paper is separated from the cassette 21 by the cooperation of the separating claw roller 6.
They are sent out one by one. In addition, 67 company's four-wheel conveyor shaft, 38 is a conveyor "-5 fixed to the conveyor shaft, and the transfer paper sent out from the cassette 21 by the feeding Ka roller 66 is arbitrarily moved from the attachment 20 (1 to the main body 1 side). 39 is a conveyance guide that transports the transfer paper to the main body 1.
It is configured integrally with a guide plate portion 4o that guides to the side. Furthermore, 41 is a rotatable presser roller, and a conveyance guide 69
The conveyor p-terra 68 is pressed by a presser roller spring 42 also provided on the guide 39. Note that this conveyance guide 39 is connected to the guide shaft 4
4 (in the direction of arrow B-G), and is pressed in the direction of arrow B in the figure by a guide spring 43. Therefore, the guide 69 is positioned and fixed by the elastic force of the spring 430 at the position where the roller 41 contacts the roller 68.

If the transfer paper sent out from the cassette 21 fails to be conveyed on the guide 69, the conveyance guide 69 is opened by rotating it in the direction of arrow C in the figure using the handle 39a. At this time, since the presser roller 41 is displaced together with the conveyance guide 39, it is easier to remove the transfer paper. This state is shown in FIG. In addition, there are 43 springs, one end 43a of which is attached to the attachment 20 body side K, and the other end 43a.
Guide 39 flII K is attached to b.

Next, regarding the drive system of the attachment, see Figure 6(a).
This will be explained using FIG. 6(b).

First, the paper feed roller shaft'
A coupler gear 47. An idler gear 4B and a solenoid 49 are fixedly installed. This swing plate 46 is always pressed in the direction of the arrow in the figure by a swing 1#J plate spring 50 on the back side where the recess 45a is provided. The zero force puller gear 47tC, which is integrated with the 7 langes 51a for positioning, also has a flange 47a for positioning, and para-crash between the gear 51 on the main body 1 side and the coupler gear 47 is guaranteed by 47a and 51a. Ru. Further, 52 is a conveying roller gear fixed to the conveying shaft 37, and is meshed with the idler gear 48. The paper feed roller gear 56 attached to the paper feed roller shaft 65 is still in mesh with the idler gear 48, and transmits the movement to the paper feed roller shaft 35 via the one-turn clutch 54'. This one-turn clutch 54 turns on the solenoid 49.
, OF FK functions by operating the clutch pawl 55 in the direction of arrow E in the figure. Therefore, coupler gear 47, eye gear 48, paper feed roller gear 56a/id 49
- The one-turn clutch 5415 all oscillates together on the oscillating plate 46 to the middle 11 degrees of the paper feed roller shaft 65f. Note that the bottom box 22 on the side of the main body 1 is provided with an opening 22& for connecting the gear 51 with the coupler gear 47 of the attachment 20 on the back side where the leg portion 23a is provided. Therefore, the copy button 25 The gear 51 starts to rotate by the body WIJ from the motor (not shown) of the main body 1 (till), which starts rotating upon receiving the copy start signal tl- issued when is pressed. It is transmitted to the coupler gear 47 and idler gear 48, and further transmitted from the idler gear 48 to the conveyance roller gear 52 and paper feed roller gear 56.
It constantly rotates while the Motor 8 motor (not shown) is being driven. In addition, the feed (4-ra 36) is turned on and off in response to a copy signal in the case of single-sheet copying, and a synchronization signal issued in synchronization with the movement of the original stage in the case of continuous copying.
The one-turn clutch 54, which functions by the operation of the solenoid 49 that repeats 'F, transmits the drive V from the paper feed roller gear 56 which is currently rotating, and rotates once each time the sheet is fed.
Transfer paper is fed out one by one from inside the cassette 21.

In this way, in this embodiment, since the main body 1 and the attachment 20 are attached, the gear 51 on the main body 1 side and the coupler gear 47 of the attachment 2011+1 automatically mesh, and the TfJ8 p19 is transmitted from the main body 1 side. communicated. Moreover, the gears 47, 48, 5
Since the 2.56 gears are integrally held on the rocking plate, problems such as uneven meshing between the gears can be prevented, and the drive can be transmitted reliably.

Next, the operation of the attachment section will be explained.

First, by pressing the copy button 25, a copying operation is started. That is, when a copy start signal is issued, the main motor (not shown) of the main body starts IU rotation, and all the gears rotate accordingly. At the same time, solenoid 49 is turned on.
N (,, the paper feed roller 66 is rotated by the one-turn clutch 54
Rotate. As a result, the uppermost transfer paper L in the cassette 21
, the paper is sent out from the cassette 21 by the circumferential length of the paper feed roller 66.

Since the distance from the separating claws 33 to 41 (feeding roller 67 is shorter than the circumferential length of the paper feed roller 66), the leading edge of the transfer paper sent out from the cassette 21 is separated by the transport roller 67.
and is held in the presser roller 41. Then the transfer paper
The transfer paper on the main body 1 side is transported along the transport rollers 37 and guided by the guide plate section 40, and slugs between the transport reeler 68 and the presser roller 41 until the shutter 12 is opened. After the shutter 12 opens in synchronization with the toner image on the drum 5, copies are made in the same manner as the manual feeding operation described above.

Next, the loading of the cassette 21 into the attachment 20 will be described (0).
This is done by engaging the recess 20a provided in the frame 20& of the attachment 200. Therefore, when inserting the cassette 21 from the left to the right in the figure,
The convex portion 21a of the cassette 21 falls into the concave portion of the attachment 200 and is positioned. Next, positioning in the front-rear direction will be explained using FIG. 7. ) Attachment Men) 2
It can be seen that the frame 20aK of No. 0 is integrally formed with a rail 20b that is provided with accurate distance from the recess 45a for positioning the main body 1 and the attachment 20.
The convex portion 21b formed integrally with the cassette 21 fits into the third portion. Therefore, the cassette 21 and the attachment 20 are positioned i4 in the front-rear direction. Therefore, the cassette 21 is correctly positioned and loaded at the predetermined loading position of the attachment 200. Therefore, according to this embodiment, the main body 1 and the attachment 20 are accurately positioned, and the cassette 21 is accurately positioned relative to the attachment 20.
Therefore, the cassette 21 is loaded into the main body 1 at the correct position. At this time, the transfer paper sent out from the cassette 21 passes through a predetermined conveyance path and reaches a position f where one end thereof is securely hooked on the separation belt 14.
Since it will pass through t, main body 1 and attachment 2
0 can be freely attached and detached, it is possible to prevent the occurrence of minute p4H mistakes.

In this embodiment, we have explained an example in which a cassette is removably loaded into the attachment, but this is not limited to this example. Even if Sea 1 is attached, L
You can use a deck and cassette, or you can use a combination of multiple cassettes.

That is, in the present invention, it goes without saying that the sheet stacking section may be used in conjunction with the manual feed tray. Also, the sheet is not limited to transfer paper, but any thin plate that can be fed again, such as 2g copy paper or plastic sheet, may be used. Further, the sheet feeding means is not limited to a feeding roller, but may be an air suction type, a rotating endless belt type, or the like. Furthermore, in the second section, the molecule II belt is not obstructed, and the air is blown out through the separation claw or nozzle.

As described above, the invention is directed to a sheet stacking section, a feeding attachment having a sheet feeding means for feeding sheets from the sheet stacking section, and an image forming apparatus'f which is provided with the feeding attachment in a detachable manner. ', is what is provided.

[Brief explanation of the drawing]

Figure 1 (aJ Tsueki) The external appearance of the main body of a copying machine to which an embodiment of the present invention is applied (main figure, Figure 1 (b) is the main figure seen from below, Figure 2 is a cross section of the main body of the copying machine) Figure 6 (at is an external perspective view of the attachment attached to the main body of the copying machine,
Fig. 6(1)) is a sectional view of the attachment, Fig. 4(t) is a perspective view of the structure of the attachment, Fig. 4(t) is a plan view of the attachment, and Fig. 5 is the state of the legs when attached. FIG. 6(a) and FIG. 6(b) are side views showing the drive section of the attachment, FIG. 7 is a sectional view showing how to position the cassette and attachment, and FIG. FIG. 3 is a cross-sectional view of the feeding section. In the figure, 1...Copying machine main body 14...Dividing belt 20...-Feeding attachment 21-e...-Cassette 26h-D-c-d...Legs Part 29/6U
... Connector shaft No. 66 ... Feeding roller 45a-b-c-ct.
...Concavity 46, Φ...Conflict & 6 U a-
b-c-de * 11 e-kai legs IQ person Gyanon Co., Ltd. agent 9 nob1be ~

Claims (1)

[Claims] (1) When installing the sheet stacking section, the sheet feeding means for feeding sheets from the sheet stacking section, and the apparatus main body, the mounting position with respect to the apparatus main body should be set at (2) ) A positioning system that determines the mounting position of the sheet stacking section, the sheet feeding means for feeding sheets from the sheet stacking section, and the lateral pressure device main body provided with the separating member of the device main body when the sheet stacking section is mounted on the device main body.