JP2702614B2 - Paper transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device, and more particularly, to a sheet conveying device used in an image forming apparatus such as an electrophotographic copying machine.

[0002]

2. Description of the Related Art FIGS. 8 and 9 are perspective views of an electrophotographic copying machine equipped with a conventionally known front loading type multi-stage tray. And FIG.
(a) and (b) are front views each showing a schematic configuration. These copiers have the advantage that the work of replenishing paper is easier than that of the type in which a tray is mounted on the side and paper is fed, and that the entire copier is made compact.

The paper conveying device of the electrophotographic copying machine shown in FIGS. 8 and 10 (a) mainly comprises a front loading type tray (10) and a conveying section (13). The sheet is sent out to the transport section (13) from the tray (10) selected based on the data inputted by the operation panel (18) or the sheet size detecting device (not shown). Then, paper is fed from the transport unit (13) to an image transfer device (not shown).

In this copier jam processing, first, the cover (1
Opening 1) as shown in FIG. 8, and then opening and closing the open / close handle (12) in the space (15) provided in the body of the copying machine, the guide plate (16) and the corresponding trays (10) are opened. The operation is performed with the provided transport roller pair (17) opened.

[0005] The sheet conveying device of the electrophotographic copying machine shown in FIGS. 9 and 10 (b) also mainly comprises a front loading type tray (20) and a conveying section (23). Paper feeding is performed in the same manner as in the apparatus of FIG.

However, in the jam clearance, the cover (21) on the side of the copying machine body is opened, and the guide plate (26) and the transport roller pair (27) provided corresponding to each tray (20) are opened. Therefore, the space (15) as in the copying machine of FIG. 8 is unnecessary.

[0007]

With respect to the opening of the guide plate and the pair of conveying rollers, the former conventional example requires a working space (15) in the copying machine, and the latter conventional example requires a work space (15) on the side of the copying machine. It is necessary to make some space available. About 150 to 200 mm is required for these spaces.

In particular, if a large capacity deck (19) of a front loading type is provided as shown in FIG. 11 (a), jamming cannot be performed from the side of the copying machine as in the latter conventional example. . Also, when a space (15) is provided between the transport unit (13) and the large-capacity deck (19) as in the former conventional example, the width (W1) is reduced by the width (W2) corresponding to the space (15). It becomes almost the same as the width (W3) of the type in which the tray is mounted on the side surface shown in FIG.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper transporting apparatus which can reduce an installation space of an image forming apparatus to be applied and can easily perform a jam clearing operation.

[0010]

In order to achieve the above object, a paper transport apparatus according to the present invention comprises a plurality of trays on which paper is placed, and the paper fed from one of the trays. And a transport unit that transports the paper to the image transfer device with a guide plate and a transport roller pair, and in a paper transport device of an image forming apparatus that can perform jam processing by opening the guide plate and the transport roller pair. A mechanism is provided in which, when the tray is pulled out forward from the image forming apparatus main body, only the tray during paper passing can be pulled out forward from the image forming apparatus integrally with the transport unit.

[0011] The image forming apparatus further includes a plurality of trays on which the sheets are placed, and a conveying unit that conveys the sheets sent from one of the trays to an image transfer apparatus by a guide plate and a pair of conveying rollers. In the sheet conveying device of the image forming apparatus, which can perform the processing by opening the guide plate and the conveying roller pair, at the time of pulling out the conveying unit, the upper tray than the tray being passed is not pulled out. It is characterized in that there is provided means for pulling out the tray and the tray below it from the image forming apparatus main body together with the transport section.

[0012]

[0013]

[0014]

According to the above construction, the transport unit can be pulled out of the image forming apparatus main body together with the tray, so that the guide of the drawn transport unit can be provided without providing a working space in the image forming apparatus main body. The jam processing is performed by opening the plate and the conveying roller pair.

[0015]

The tray related to the occurrence of the jam can be pulled out by means for pulling out the conveying section from the main body of the image forming apparatus together with the tray being passed through the sheet.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the present invention. The paper transport device of the present embodiment mainly includes a tray (1
a), (1b) and (1c) and a transport section (3).

The trays (1a) to (1c) are of a front-loading type which can be inserted (arrow (m6)) or pulled out (arrow (m5)) with respect to the copying machine body (2). ing.

The transport section (3) is provided between the large-capacity deck (9) attached to the copying machine body (2) and the trays (1a) to (1c). Copier body as in (1c)
Insert (arrow (m2)) or pull out (arrow
(m1)).

FIG. 7 shows the transport section (3) and the tray (1) (tray).
(Represents one of (1a), (1b) and (1c))
2 shows a state before and after movement with respect to the copying machine main body (2) in a plan view. In FIG. 7A, the tray (1) and the transport unit (3) are located together with the large-capacity deck (9) in the main body (2), and are in a stopped state or a normal operation state. FIG. 7 (b) shows a state in which only the tray (1) is pulled forward along the rail (8), and FIG. 7 (c) shows the tray (1) and the transport device (3) along the rail (not shown). Is drawn out forward. As will be described later, when the transport section (3) is pulled out, the trays (1a) to (1c) also move with the transport section (3).

The transfer of the transport section (3) and the tray (1) (FIG. 7) is performed specifically by rails (8a) and (8) provided in the copying machine main body (2) as shown in FIG. 8d), (8b) and (8e), (8c) and (8f), and (8g), the trays (1a), (1b), (1c) and the transport section (3) can be drawn out. I have.

As shown in FIG. 1, the transport unit (3) includes
As in the conventional example of FIG. 10, the paper is transferred to an image transfer device (not shown).
A guide plate (6) and a pair of transport rollers (7) for transporting the sheet are provided. In addition, the guide plate (6)
It is movable in directions (m3) and (m4) (FIGS. 1 and 6).

As shown in FIG. 6, the transport section (3) includes a tray (1a)
~ (1c) and the large capacity deck (9), when opening the guide plate (6) and the transport roller pair (7), pull out the transport section (3), and then It is necessary to move (6) (arrow (m4)). If the guide plate (6) is moved (arrow (m4)) with the transport unit (3) pulled out, the jam can be easily removed. Note that the guide plate (6) is
It may be configured to move in the same manner as in the conventional example.

In this embodiment, the transport unit (3) is connected to all trays.
To pull out from the copier body (2) together with (1a) to (1c),
An engaging means (40) and a locking member (50) shown in FIG. 3 are provided.

The engaging means (40) shown in FIG. 3 comprises a hook (42), a solenoid (44) and a spring (46), and is provided in the transport section (3). The hook (42) can rotate around the fulcrum (41) .When the solenoid (44) is turned on, the hook (42) resists the pulling force of the spring (46) as shown in FIG. ) Is the tray (1a)
To the rear of the transport section (3). Also, solenoid (44)
When the hook (42) is locked to the tray (1) in the OFF state, the spring (46)
It is released by the pulling force.

The locking member (50) shown in FIG.
When the tray is pulled out, the tray (1d) immediately below the tray is pulled out. For attachment, one end of the locking member (50) may be fixed to the back of the tray (1u) with screws (52), and the other end may be in contact with the back of the tray (1d). The shape and the like of the locking member (50) are not particularly limited as long as the locking member (50) has a strength enough to extrude the tray (1u).
Also, it may be attached with an adhesive or the like. When the tray (1u) is pulled forward, the tray (1d) is pushed forward at the lower end of the locking member (50). If the tray (1u) is, for example, the tray (1a) in FIG. 1, the tray (1d) is the tray (1b).

In this embodiment, a locking member (50) is provided on the back of the trays (1a) and (1b), and the hook (42) of the engaging means (40) is provided on the back of the tray (1a). It locks against. When a jam occurs, the solenoid (44) is turned on first
Then, the locking state shown in FIG. 3 is obtained. Pull out the transport section (3),
Tray (1a) and tray (1a) locked with hook (42)
And the tray locked to the locking member (50) of (1b)
(1b) and (1c) will be drawn together. Incidentally, the hook (42) is driven by the solenoid (44) in this manner,
The tray (1a), (1b),
Instead of pulling out (1c) with the pulling out of the transport unit (3),
A hook fixed to the transport unit (3) so that the tray (1a) is always locked to the rear surface on the transport unit (3) side may be used as the engagement means (40).

Further, an engaging member (40) having a hook (42) to be locked to each of the trays (1a) to (1c) is transported by the transport unit.
With the configuration provided in (3) and ON / OFF at the same time, all the trays (1a) to (1c) can be pulled out together with the transport section (3) without providing the locking member (50). Incidentally, instead of providing a plurality of hooks (42) which are turned ON / OFF at the same time, a plurality of fixed state structures in which the transport unit (3) and the trays (1a), (1b), (1c) are always engaged. A hook may be provided.

Next, the trays (1a), (1)
An embodiment of drawing out from the copying machine body (2) together with (b) or (1c) will be described. The block diagram of FIG.
0) shows the mutual relationship between the respective parts for operating (0). As shown in the drawing, paper size data is sent from a size input operation means (30) and an automatic size detection means (31) to a microcomputer (32). Here, the size input operation means (30) is the operation panel (18)
(FIG. 8) and the like, and sends the paper size data manually set by the operator to the microcomputer (32). The automatic size detecting means (31) means, as conventionally known, means for optically scanning a document and determining the paper size from the reflected light, and the determined data is sent to the microcomputer (32). send.

The microcomputer (32) drives any one of the three trays (1a) to (1c), such as a forward feed roller and a double feed prevention roller, according to the input of the paper size data. That selected tray through driver circuit (33)
The solenoid (4) provided in the transport section (3) corresponding to (1)
4) Drive (FIG. 3). By driving the solenoid (44), the hook (42) is engaged with the engaging portion (that is, the rear surface of the selected tray (1) on the side of the transport portion (3)). In addition, ON / OFF of solenoid (44)
As a result, the hook (42) moves as shown by the arrow in FIG. 5 (a).

In this embodiment, only the tray during paper passing is transported by the transport unit.
In order to pull out with (3), engaging means (40) corresponding to each tray (1a), (1b) and (1c) are provided as shown in FIG. As shown in FIG.
(40) may be provided on each of the trays (1a), (1b) and (1c). In this case, the tray (1a), (1b) and (1
It is necessary to provide a concave portion (48) corresponding to c).

Next, the trays (1a), (1)
A description will be given of b) or (1c) and an embodiment in which both trays lower than the tray during paper passing are pulled out. The microcomputer (32) also determines the position of the selected tray (1) among the three trays (1a), (1b), and (1c) based on the data of the selected tray (1). The driver circuits (33) can be driven to engage the hooks (42) of those trays with the engaging portions. Therefore, in the configuration shown in FIGS. 5A and 5B,
Only the control of the engagement means (40) needs to be changed.

5 (a), the tray (1a) and (1b) are provided with the locking member (50), that is, the configuration shown in FIG. 5 (c). Good. in this case,
By moving only the engagement means (40) corresponding to the tray on which the paper is passing, the tray below the tray on which the paper is passing can be pulled out together.

As shown in FIG. 5D, the engagement means (40)
May be provided on each of the trays (1a), (1b) and (1c).
In that case, it is necessary to provide a concave portion (48) corresponding to each tray (1a), (1b) and (1c) in the transport section (3).

[0035]

As described above, according to the present invention, a plurality of trays on which sheets are placed, and a sheet fed from one of the trays are transferred to the image transfer apparatus by a guide plate and a conveying roller pair. It consists of a transport unit for transporting, in a sheet conveying apparatus of an image forming apparatus which can be carried out by opening of the guide plate and the conveyor roller pair jam processing, the transport unit image
When pulling the tray forward from the forming apparatus body,
Since there is provided a unit that can be pulled out forward from the image forming apparatus integrally with the transport unit, there is no need to provide a space inside the applied image forming apparatus, and
The feeding unit and tray are pulled out from the main body of the image forming apparatus.
As a result, the installation space on the side of the image forming apparatus main body is secured.
You don't have to. As a result, it is possible to reduce the installation space of the image forming apparatus and realize a sheet transporting apparatus that can easily perform a jam clearing operation.

[0036]

In the above-mentioned paper conveying apparatus, when a means for allowing the conveying section to be pulled out from the main body of the image forming apparatus together with the tray through which the paper is passing is provided, the jam related to the occurrence of the jam is quickly cleared. Can be applied.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a mutual relationship between units for controlling the operation of the embodiment of the present invention.

FIG. 3 is a schematic view showing an example of an engaging means used in the embodiment of the present invention.

FIG. 4 is a schematic view showing an example of a locking member used in the embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a relationship between an engagement unit and a locking member used in an embodiment of the present invention, a transport unit, and a tray.

FIG. 6 is a front view schematically showing a state in which the embodiment of the present invention is applied to an electrophotographic copying machine.

FIG. 7 is a plan view for explaining the mutual relationship of each part constituting the embodiment of the present invention.

FIG. 8 is a perspective view showing the appearance of an electrophotographic copying machine to which a first conventional example is applied.

FIG. 9 is a perspective view showing the appearance of an electrophotographic copying machine to which a second conventional example is applied.

FIG. 10 is a schematic front view for explaining an opening operation of a transport unit of the first and second conventional examples.

FIG. 11 is an installation space of an electrophotographic copying machine in which a large capacity deck is attached to the first conventional example of the front loading system, and an installation space of an electrophotographic copying machine in which a large capacity deck is installed in a paper feeding device for feeding paper from the side. FIG.

[Explanation of symbols]

 (1) (1a) (1b) (1c) (1u) (1d)… Tray (2)… Copier body (3)… Transport part (4)… Paper (6)… Guide plate (7)… Transport roller Pair (8) (8a) (8b) (8c) (8d) (8e) (8f) (8g)… Rail (9)… Large capacity deck (10)… Tray (11)… Cover (12)… Open / close handle (13)… Transport part (15)… Space (16)… Guide plate (17)… Transport roller pair (18)… Operation panel (19)… Large capacity deck (20)… Tray (21)… Cover (23) … Conveyor (26)… Guide plate (27)… Conveyor roller pair (30)… Size input operation means (31)… Automatic size detection means (32)… Microcomputer (33)… Driver circuit (40)… Engagement means (41) ... fulcrum (42) ... hook (44) ... solenoid (46) ... spring (48) ... recess (50) ... locking member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noriyuki Shinno 1-2-28 Tamazo, Chuo-ku, Osaka Mita Kogyo Co., Ltd. (72) Inventor Masahiro Sako 1-2-28 Tamazo, Chuo-ku, Osaka Mita (56) References JP-A-53-127727 (JP, A)

Claims (2)

(57) [Claims] A plurality of trays on which sheets are placed, and a transport unit that transports the sheets sent from one of the trays to an image transfer apparatus by a guide plate and a pair of transport rollers; In the sheet conveying apparatus of the image forming apparatus, which can perform the jam processing by opening the guide plate and the conveying roller pair, when the conveying unit is pulled out from the image forming apparatus main body, only the tray during the sheet passing is the conveying unit. A sheet conveying device provided with means for integrally pulling out the image forming apparatus from the image forming apparatus. 2. A multi-stage tray on which sheets are placed, and a transport unit that transports the sheets sent out from one of the trays to an image transfer device by a guide plate and a pair of transport rollers, In the sheet conveying device of the image forming apparatus capable of performing the jam processing by opening the guide plate and the conveying roller pair, when the conveying unit is pulled forward from the image forming apparatus main body, the upper tray than the tray that is passing the paper is A sheet transporting device comprising means for pulling out a tray through which a sheet is being passed and a tray below the tray without being pulled out together with the transporting unit so as to be able to be pulled forward from the image forming apparatus.