JPH0412048Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a reversing paper feeder, and more specifically, the paper feeding direction from the paper feeding cassette by the paper feeding roller is synchronized with the optical system. The present invention relates to a reversing sheet feeding device in which the direction of sheet conveyance by registration rollers that operate is set to be opposite to that of the sheet feeding device.

<Conventional technology> Conventionally, office equipment such as copying machines uses a paper feed cassette that stores a large number of sheets of paper of a predetermined size, and when it becomes necessary to use paper of a different size, the paper feed cassette is used. Commonly used printers are those in which the paper size can be easily changed by simply replacing the paper cassette. In recent years, the size of originals that can be copied has tended to increase, so larger paper cassettes that can accommodate large-sized paper are being used to accommodate the size of originals that can be copied. I'm getting used to it.

Therefore, when the paper feed cassette is attached to the copying machine main body, the installation area is required to be considerably larger than the size of the copying machine main body, which reduces the efficiency of use of limited space such as an office. A problem occurs.

In order to solve these problems, conventional methods have been used to reverse the direction in which the paper feed rollers feed the paper from the paper cassette and the direction in which the paper is conveyed by the registration rollers, which operate in synchronization with the optical system. did,
A reversing paper feeding device is provided, and even when the paper feeding cassette is installed, the paper feeding cassette hardly protrudes from the vertical projection position of the optical system, which requires the widest planar shape, for example, so that copying can be carried out. This allows the entire machine to be made more compact.

Such a reversing paper feed device includes a paper feed roller that feeds sheets one by one from a paper feed cassette having a cassette claw, a feed roller that conveys the paper sent out by the paper feed roller toward a registration roller, and a guide member that reverses the conveyance direction of the paper conveyed by the feed roller,
The drive of the paper feed roller and registration roller is controlled in accordance with a predetermined paper transport timing, and the drive of the feed roller is also controlled in accordance with the above paper transport timing using a clutch etc. -Refer to Publication No. 36041).

Therefore, by rotating the paper feed roller and the feed roller, primary paper feeding can be performed until the leading edge of the paper contacts the registration roller.
Next, by rotationally driving the feed roller and registration roller, secondary paper feeding for performing a copying operation can be performed.

Incidentally, in the reversing sheet feeding device having the above configuration, it is necessary to take measures against the occurrence of a jam, and a configuration is adopted in which the end portion of the conveyance guide on the sheet feeding cassette side is rotatably attached to the main body of the device.

<Problems to be Solved by the Invention> With the reversing sheet feeding device having the above configuration, it is possible to reduce the installation area of a copying machine, and to ensure reliable sheet conveyance. If a jam occurs in the paper feeding device section, the paper feeding path can be exposed to the outside by rotating the conveyance guide, so that the jam can be easily removed.

However, in the case of the above configuration, it is not possible to use a paper feed cassette other than the paper feed cassette that has a cassette claw, and if a paper feed cassette that does not have a cassette claw can be used,
It is necessary to install a friction member that comes into pressure contact with the paper feed roller at the position where the paper is sent out from the paper feed cassette by the paper feed roller. And in this case, the fifth
As shown in the figure, the upper end of the conveyance guide on the friction member side must protrude upward, so when the conveyance guide is rotated, as shown by the broken line in the figure, the upper protruding part is connected to the feed roller and the guide. There is a problem in that the user is in close proximity to the member, and in reality, it is not possible to secure a space in which the hand can be inserted for jamming.

This idea was made in view of the above problems, and it is possible to easily remove jams when a retard-type paper feeding mechanism is adopted, and it is easy to remove jams even under unfavorable conditions. The object of the present invention is to provide a reversing sheet feeding device that can ensure the following.

<Means for Solving the Problems> In order to achieve the above object, the reversing paper feeding device of this invention uses a guide member to direct the conveying direction of the paper fed from the inside of the paper storage section by the paper feeding roller. In a reversing sheet feeding device that inverts the sheet and guides the sheet to a registration means that operates in synchronization with an optical system, the guide member is provided with an outer guide member and an inner guide member that form a space that allows the sheet to pass therethrough and to allow deflection before reversing. At the same time, the part of the outer guide member that forms the space that allows for deflection is comprised of an internal member that is rotatably mounted around a rotation fulcrum located close to the paper storage section. However, this internal member relatively rotates following the rotation of the exterior cover member which is rotatably attached around a rotation fulcrum located approximately below the reversing part, and when the exterior cover member is in the most open state. It is characterized in that it is connected to the exterior cover member so that a required jam processing space communicating with the space can be opened.

However, while the engagement pin attached to the internal member is engaged with the engagement groove formed in the exterior cover member, the internal member is relatively rotated following the rotation of the exterior cover member, When the exterior cover member is in the most open state, the engagement pin of the internal member may be rotated near the rotation fulcrum position of the exterior cover member.

<Function> In the reversing sheet feeding device having the above configuration, the internal member is relatively rotated following the rotation of the exterior cover member, and the internal member allows the internal member to rotate the exterior cover member in the most open state. Space for jam processing can be opened. This allows you to easily insert your hand and perform jamming. Moreover, design conditions (positional relationship between the paper feed cassette and other conveyance members and internal members, The degree of curvature, the position of the rotational fulcrum of the outer cover member, etc.) can also open a required jam processing space to enable jam processing. This is because when both the internal member and the exterior cover member are configured as one, they are rotated by a common pivot point, so there is a great deal of freedom in designing the parts that affect the open position of the internal member. However, when both are connected so that they can follow and rotate, it is necessary to set the connection position and the position of the rotation fulcrum of the internal member, etc., of the parts that affect the open position of the internal member. This is because the degree of freedom in design is very high, and the open posture of the internal members can be set as desired. Since the design has such a high degree of freedom, it is possible to ensure ease of jamming even under unfavorable conditions. In addition, even if the distance between the exterior cover member and the space that allows for deflection increases due to various conditions such as the setting of the conveyance path length, the degree of curvature of each guide member, and the exterior design of the equipment, Since the required opening position of the member can be set as desired to open the required jam processing space that communicates with the above space, jammed paper can be easily found and the jam processing operation is also simple. becomes.

<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.

FIG. 4 is a schematic diagram showing the internal mechanism of a copying machine equipped with the reversing sheet feeding device of the present invention. Only the built-in part is wide, and the rest of the copy processing section 3 and the copy paper conveyance section 4 are formed narrow.

More specifically, a contact glass 11 is provided at a predetermined position on the upper surface of the copying machine main body 1 for supporting an original to be copied, and the optical system 2 includes a light source 21 for scanning and exposing the original; Reflecting mirrors 22, 23, which guide the reflected light from the original to the lens 25,
24, and a reflecting mirror 26 that guides the light that has passed through the lens 25 to the copy processing section 3. The copying processing section 3 includes a photosensitive drum 31 that rotates in one direction for each copying operation, a charging charger 32, a developing device 33, a transfer charger 34, a separation belt 35, which are sequentially arranged around the photosensitive drum 31,
and a cleaner 36. The copy paper transport section 4 includes a reversing paper feed device 5 that feeds out sheets one by one from a paper feed cassette 12 mounted below the copy processing section 3, and a resistor that is driven in synchronization with the optical system 2. It has a roller 41, a conveyance roller 42 that conveys the paper separated from the photosensitive drum 31 by the separation belt 35, a fixing device 43, and an ejection roller 44 that ejects the paper onto the ejection tray 15. At a predetermined position of a stack bypass 45 installed at a predetermined position in the copying machine main body 1, there are provided a forward feed roller 46 for conveying the paper toward the registration roller 41, and a paper feed roller 47.
is attached, so that paper feeding from the paper feed cassette 12 and paper feeding from the stack bypass 45 can be selected.

FIG. 1 is a diagram showing the configuration of the reversing sheet feeding device 5 in detail, and includes a sheet feeding roller 51, a feed roller 52, a driven roller 53, an upstream guide section 63, and a flow side guide section 55 as main parts. There is.

When the paper feed roller 51 is equipped with the paper feed cassette 12, the paper P is supported on the paper loading plate 13, which is rotated upward by a push-up lever 14 mounted at a predetermined position inside the copying machine main body 1. By rotating while being pressed against the upper surface, the paper P is sent out one by one, and the delivered paper P is guided between the paper feed roller 51 and the friction member 58, ensuring that the paper P is fed out one by one. This makes it possible to prevent double feeding. Then, the inner guide member 5 is connected to the paper feed roller 51 and the friction member 58.
7 and the upstream guide section 63 formed by the upstream outer guide member 61 forms a space 59 that allows the paper P to curve and allows the leading edge of the paper P to be corrected.

The upstream outer guide member 61 includes a plate-like member 61b as an internal member whose pivot point 61a is above the bottom of the copying machine body and close to the friction member 58, and a plate-like member 61b located at the outermost bottom surface of the copying machine body. It is composed of an exterior cover member 61d with a rotation fulcrum 61c, and an engagement pin 61e attached to the tip of the plate member 61b is connected to the exterior cover member 61d.
By engaging with the engagement groove 61f formed on the back side of the plate member 61b, the plate member 61b can also be rotated following the rotation of the exterior cover member 61d. The plate member 61b is formed in such a shape that the rotation fulcrum 61a and the engagement pin 61e are located at the uppermost position, and the middle part is curved downward.

Further, a feed roller 52 and a leaf spring 54 are connected to the space 59 and are constantly driven to rotate.
A driven roller 53 is attached which is brought into pressure contact with the feed roller 52 (however, this driven roller 53 is attached to a predetermined position on the tip end side of the plate member 61b), and the feed roller 52 is constantly driven to rotate. and a downstream outer guide member 56 between the driven roller 53 and the registration roller 41,
A downstream guide portion 55 consisting of an inner guide member 57 is attached.

To explain in more detail, the inner guide member 5
7 is entirely made of synthetic resin, etc., and has a plurality of ribs with convex curved side surfaces formed on its outer surface, and the distance between the ribs and the top surface is approximately 1.
A downstream outer guide member 56 made of iron or the like is attached so as to have a diameter of 1.5 mm, and a space is provided between the two for paper conveyance. Then, the inner guide member 57
A feed roller 52 is rotatably supported at a position slightly apart from the space, and a switch 60 for detecting the paper P is supported immediately in front of the registration roller 41. Further, the driven roller 53 is moved by a leaf spring 54 to the copying machine main body 1.
When the upstream outer guide member 61 is opened, the driven roller 53 is separated from the feed roller 52, and the upstream guide member 61 is moved away from the feed roller 52. The driven roller 53 can be brought into pressure contact with the feed roller 52 in the closed state. However, the biasing force exerted by the leaf spring 54 is set to be smaller than the stiffness of the sheet P. Note that 62 is a magnet.

Reference numeral 48 denotes a lever that rotates upward when the paper comes into contact with it when the paper is set on the stack bypass 45, thereby moving the advance roller 46 upward.

With the above configuration, by rotating the paper feed roller 51 and feeding the paper P one sheet at a time from the inside of the paper feed cassette 12, the paper P can be delivered between the feed roller 52 and the driven roller 53 through the space 59. Since the rotation of the feed roller 52 is applied as a conveyance force of the paper P, a sufficient conveyance force is applied and the paper P passes through the downstream guide section 55 and reaches the registration roller 41.
The object is conveyed until it comes into contact with the object. And paper P
Since the paper P is conveyed by the paper feed rollers 51 for a predetermined period of time even after the leading end of the paper contacts the registration roller 41, the paper P remains in front of the downstream outer guide member 56, as shown by the solid line in FIG. , the driven roller 53 is moved by the spring 54 due to the stiffness of the paper P.
Since the paper P is moved against the urging force of It is possible to prevent the inconvenience of jamming caused by conveyance. However, if the paper P is not very stiff, the driven roller 53 will hardly move.
Since the pressing force against the feed roller 52 becomes weaker,
The feed roller 52 and the paper P slip, and the paper P
This means that the transportation of the materials can be stopped. Further, in the primary paper feeding, the paper P is stopped inside the space 59 in a state where it is deflected by about 5 to 10 mm from the normal conveyance surface, so that the leading edge of the paper P can be corrected.

After that, when performing secondary paper feeding, the paper feeding roller 51 is in a stopped state and the frictional force between the friction member 58 and the paper P acts as a resistance force. When conveyance of the paper P starts, as shown by the broken line in FIG. 3, the paper P is immediately pulled and follows the outer surface of the inner guide member 57. 52. Therefore, the driven roller 53 is brought into strong pressure contact with the feed roller 52, and the feed roller 52
The rotation of the paper P is caused to act as a conveyance force on the paper P without any slipping, and the conveyance force exerted on the paper P by the registration rollers 41 and the feed roller 52 overcomes the above-mentioned resistance force, and the paper P is transported. It is possible to perform secondary feeding of paper to be transported toward the copy processing section 3.

In addition, if a jam occurs between the paper feed roller 51 and the feed roller 52, the cover member 61d is moved to the rotation fulcrum 61c as shown in FIG.
It is only necessary to rotate the engagement pin 61e as the center.
Due to the engagement between the upstream side guide member 61b and the engagement groove 61f, the upstream side guide member 61b also rotates about the rotational fulcrum 61a, so that the upstream side outer guide member 61 rotates significantly downward and exposes the space 59 to the outside. By inserting your hand in this state,
The jammed paper P can be easily removed.
Moreover, the plate member 61b and the exterior cover member 6
Design conditions such as the positional relationship between the paper feed cassette 12 and other conveyance members and the plate member 61b, the degree of curvature of the plate member 61b, and the position of the rotation fulcrum 61c of the exterior cover member 61d], the required jam processing space can be opened to enable jam processing. This is because when both the plate member 61b and the exterior cover member 61d are configured integrally, they are rotated by a common rotational fulcrum, so the design of the parts that affect the open position of the plate member 61b is difficult. has a very small degree of freedom, whereas in the case where both are connected so that they can rotate relative to each other, the engagement pin 61 that determines this connection position
e, the setting of the engagement groove 61f, the setting of the position of the rotation fulcrum 61a of the plate-like member 61b, etc.
This is because there is a very high degree of freedom in designing the parts that affect the open position of the plate member 61b, and the open position of the plate member 61b can be set as desired. Furthermore, even if the distance between the exterior cover member 61d and the space 59 that allows deflection becomes long due to the influence of various conditions such as the setting of the conveyance path length, the degree of curvature of each guide member, and the exterior design of the equipment, By setting the open position of the plate-like member 61b as desired, it is possible to open the required jam processing space that communicates with the above-mentioned space 59, so that jammed paper can be easily found and jam processing can be performed easily. The operation is also simple.

As is clear from the above explanation, the feed roller 5
2 rotates all the time, but conveyance force can only be applied to the paper P while the driven roller 53 is in pressure contact with the paper P. Therefore, the paper is fed while the registration roller 41 is stopped. The paper P is conveyed by rotating the rollers 51 until the paper P comes into contact with the registration rollers 41 and along the inner surface of the outer guide plate 56, and the state where the paper feed rollers 51 are stopped. Registration roller 4
By rotating the paper P, only the period when the paper P is in a state along the outer surface of the inner guide member 57, and during the period other than the above period, no or almost no conveying force is applied to the paper P, and the paper is This does not cause any inconvenience in transporting P.

Furthermore, as for the installation position of the feed roller 52, it is most preferable to install it at a position where the conveyance direction of the paper P changes rapidly, as shown in the drawing.
Depending on the stiffness of the paper P, selection control between a state in which the conveying force can be reliably transmitted and a state in which the paper slips and hardly transmits the conveying force can be performed reliably regardless of the amount of frictional resistance of the feed roller 52. .

Furthermore, since the upstream outer guide member 61 uses the upward protruding portion of the plate-like member 61b close to the friction member 58 as a rotation fulcrum, when it is rotated for jamming, the area of the space 59 exposed to the outside is This makes it easier to insert your hand and handle jams more easily. Furthermore, since the retard system is adopted, it is possible to reliably feed sheets one by one from a paper feed cassette that does not have a cassette claw.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, it is possible to control the rotational drive of the feed roller 52 and the driven roller 53 to suit temporary paper feeding and secondary paper feeding. However, various other design changes can be made without changing the gist of the invention.

<Effects of the Invention> As described above, the present invention can perform jam processing in a retard-type reversing paper feeder by simply rotating a member that allows deflection, and moreover, can remove a desired jam. There is a high degree of freedom in the design for opening the open space for processing, and it has the unique practical effect of ensuring ease of jam processing even under unfavorable conditions.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the main parts of the reversing paper feeding device of this invention, Fig. 2 is a longitudinal sectional view showing the jam processing state, and Fig. 3 is a longitudinal sectional view of the main parts explaining the paper feeding operation state. 4 is a schematic diagram showing the main parts of a copying machine incorporating a reversing sheet feeding device, and FIG. 5 is a schematic diagram showing the main parts of a conventional example. 12... Paper feed cassette, 41... Registration roller, 51... Paper feed roller, 52... Feed roller, 5
3...Followed roller, 55...Downstream guide section, 5
6...Downstream guide member, 57...Inner guide member, 58...Friction member, 59...Space, 61...
Upstream side outer guide member, 61a, 61c... Rotation fulcrum, 61b... Plate member, 61d... Exterior cover member, 61e... Engagement pin, 61f... Engagement groove.

Claims (1)

[Claims for Utility Model Registration] 1. Inverted paper feeding in which the conveying direction of the paper fed from the inside of the paper storage unit by the paper feed roller is reversed by a guide member and guided to a registration means that operates in synchronization with an optical system. In the apparatus, the guide member is composed of an outer guide member and an inner guide member that form a space that allows the paper to pass through and deflect before being reversed, and a space that allows the deflection of the outer guide member. The internal member is rotatably mounted around a pivot point located close to the paper storage section, and this internal member is attached to rotate around a pivot point located approximately below the reversing section. The exterior cover is configured to rotate relative to the rotation of the exterior cover member rotatably attached to the exterior cover member, and to open the required jam processing space communicating with the above space when the exterior cover member is in its most open state. A reversing sheet feeding device, characterized in that it is connected to a member. 2 With the engagement pin attached to the internal member engaged with the engagement groove formed in the exterior cover member, the internal member is relatively rotated following the rotation of the exterior cover member, and the exterior The reverse feed according to claim 1 of the above-mentioned utility model registration claim, characterized in that when the cover member is in the most open state, the engaging pin of the internal member is rotated near the rotational fulcrum position of the outer cover member. paper equipment.