JP2690302B2 - Paper transport mechanism of compound copier - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport mechanism of a compound copying machine capable of not only ordinary single-sided copying, but also double-sided copying and synthetic copying. processing)
The present invention relates to a paper transport mechanism that enables easy operation. Conventional technology and its problems In a compound copying machine capable of double-sided copying as well as normal one-sided copying, and composite copying, paper that has exited the fixing section is returned as it is, or is switched back and reversed (switchback). In addition, since the paper transport mechanism is complicated and the space is small, it is difficult to remove the jam in the paper transport path after the fixing unit. OBJECT OF THE INVENTION It is an object of the present invention to provide a paper transport mechanism in a compound copying machine which can easily perform jam processing in a paper transport path after a fixing unit. Configuration of the Invention The paper transport mechanism of the present invention is a compound copier having both a normal single-sided copy function and a double-sided copy function and a composite copy function, and a fixing section outlet provided in the main body of the copier,
A first branch guide member for switching between a normal single-sided copy state or a double-sided copy state and a composite copy state, between a discharge port provided on a swingable cover that is swingable with respect to the main body of the copying machine; A second branch guide member that switches between a normal single-sided copy state and a double-sided copy state, a pair of upper and lower conveyance rollers between the first and second branch guide members, and a second pair of conveyance rollers when viewed in the paper conveyance direction. A pair of upper and lower paper discharge rollers provided on the downstream side of the branch guide member, and a return guide unit that guides the paper after the first transfer process toward the transfer unit again for composite copy or double-sided copy. In the paper transporting mechanism of the compound copying machine, the copying machine body is provided with a unit that swings in a direction away from the copying machine body when the swing cover is opened and closed. A restricting member for restricting the swing of the unit within a predetermined swing angle is provided on the machine body side, and the swing cover swings even after the unit cannot swing beyond the predetermined swing angle due to the restraint member. The first and second branch guide members and the upper roller of the conveying roller pair are connected to the main body of the copying machine so that the space between the swing cover and the unit is opened by continuing the movement. And a lower roller of the conveying roller pair, a lower roller of the paper discharging roller pair, and the return guide on the unit side.
It is a structural feature that the upper roller of the paper discharge roller pair is provided on the swing cover side. Operation When the swing cover is opened when a jam occurs in the paper transport mechanism of the present invention, the paper discharge roller pair that has been press-contacted until then is opened in conjunction with it, and automatically the lower roller of the transport roller pair is opened. The unit including the lower roller of the pair of discharge rollers swings. Therefore, the gap between the upper and lower rollers of each roller pair and the gap between the first and second branch guide members provided on the copying machine main body side and the guide member on the unit side are widened so that the jam can be easily removed. Become. At this time, since the swing cover can be further swung even after the swing of the unit is restricted, the gap between the unit and the swing cover as well as between the unit and the copying machine main body is widened. Since the above-mentioned unit can be observed from the completely exposed state, that is, from above and below, and from the front and back, the easiness of the jam processing is greatly improved. Further, when the swing cover is closed, the lower rollers move upward in conjunction with it, and the original roller pairs are formed at predetermined positions. Therefore, there is no need for readjustment, and the operation is extremely simple. Examples Hereinafter, the present invention will be described in more detail based on the examples shown in the drawings. Here, FIG. 1 is a schematic cross-sectional view of a paper transport mechanism of an embodiment of the present invention in a state where the swing cover is closed, and FIG. 2 is a view corresponding to FIG. 1 showing a state in which the swing cover is slightly opened. FIG. 3 is a view corresponding to FIG. 1 showing a state where the swing cover is wide open, and FIG. 4 is a view corresponding to FIG. 1 showing a state where the swing cover is completely opened. The present invention is not limited by the embodiment shown in the drawings. The paper conveying mechanism 1 shown in FIG. 1 is incorporated in a compound copying machine capable of double-sided copying and composite copying, and is provided between the exit E of the fixing unit F and the swing cover 8 as a first branch guide. A member 2, a conveyance roller pair 3, a second branch guide member 4, a paper discharge roller pair 5, a reversing roller 6, and a driven roller 7 are provided. When the first branch guide member 2 is raised, the paper exiting the fixing section outlet E is directly guided to the return guide section 9.
This serves as a paper conveyance path when performing a synthetic copy. Tilt the first branch guide member 2 as shown in FIG.
On the other hand, when the second branch guide member 4 is also tilted downward, the paper exiting the fixing section outlet E is guided to the paper discharge roller pair 5 through the transport roller pair 3, and is horizontally long provided on the swing cover 8. is discharged from the opening shape of the discharge outlet 8 _a. This is the transport path for normal one-sided copying. Tilt the first branch guide member 2 as shown in FIG.
When the second branch guide member 4 is lifted as shown in FIG. 1, the paper exiting the fixing section outlet E passes through the second pair of guide rollers 4 from the conveying roller pair 3 to the upper roller of the discharge roller pair. It passes between _5a and the reversing roller 6 and is pushed upward. When pressed against the upper roller 5 _a sheet discharge roller pair paper in reverse roller 6 when pushed halfway, paper sent back by the rotation of the upper roller 5 _a, the lower roller 3 _b and the driven roller of the pair of conveying rollers It is guided to the return guide section 9 through the section between 7. This is for reversing and returning the paper, and is a conveyance route for performing double-sided copying. The lower roller 3 _b of the conveying roller pair, the lower roller 5 _b of the paper discharging roller pair, the driven roller 7 and the return guide section 9 are integrally attached to the unit 10.
Is rotatably supported by a spindle 11. On the other hand, the upper roller 5 _a of the discharge roller pair, the swing cover 8
The swing cover 8 is rotatably supported by a support shaft 13. The support roller 12 provided on the unit 10 is supported by the cam surface 14 provided on a part of the swing cover 8 so that the unit 10 is supported at a predetermined position.
The lower rollers 3 _b and 5 _b face the upper rollers 3 _a and 5 _a at predetermined positions to form the roller pairs 3 and 5, respectively. Reference numeral 15 is a leaf spring, the function of which will be described later. When a jam occurs in the paper transport mechanism 1, the swing cover 8 is opened as shown in FIG. Then, the supporting roller 12 of the unit 10 moves on the cam surface 14 of the swing cover 8, and the unit 10 moves down by its own weight. When lowered to a certain extent, the unit 10 comes into contact with the leaf spring 15. As shown in FIG. 3, when the swing cover 8 is further opened, the unit 10 is supported by the leaf spring 15 and does not open further, and the supporting roller 12 of the unit 10 and the cam surface of the swing cover 8 are not opened. It will be separated from 14. As shown in FIG. 4, the swing cover 8 can be further swung, and when it is tilted to the horizontal position, the swing cover 8 stops there. At this time, the unit 10 is elastically supported by the leaf spring 15, so if you press it with your hand as shown by the arrow α, the unit 10
Is further lowered, and the paper conveyance path is opened so that the jam can be easily removed. That is, the unit 10 is opened from the main body of the copying machine surrounding the unit 10 and the swinging cover 8, and the paper jam can be checked from before and after and from above and below, and the paper jam can be removed. After the jam processing is finished, if the unit 10 that has been held down is released, the unit 10 is restored to the state shown in FIG. 3 by the elastic force of the leaf spring 15. Therefore, when the rocking cover 8 is closed, the cam surface 14 of the rocking cover 8 contacts the supporting roller 12 of the unit 10. Further, when the rocking cover 8 is closed, the supporting roller 12 is pushed by the cam surface 14. Unit 10 is pushed up. Thus, the process from FIG. 4 to FIG. 1 is reversed, and the transport roller pair 3 and the paper discharge roller pair 5 are returned to their original predetermined positions.
Will be set. As described above, according to the paper transport mechanism 1, the rocking cover 8 is opened to naturally open the space between the roller pairs 3 and 5 and the space between the first and second branch guide members and the unit. It is possible to easily perform the jam processing in the paper transport mechanism 1 of the compound copying machine in which many rollers and guides are densely packed. If the swing cover 8 is closed after the jam processing, the roller pairs 3 and 5 are naturally set to their original positions, so that readjustment is not necessary and the handling is extremely simple. EFFECTS OF THE INVENTION According to the present invention, there is provided a composite copying machine having both a normal single-sided copying function and a double-sided copying function and a synthetic copying function. A first branch guide member for switching between a normal single-sided copy state or a double-sided copy state and a composite copy state, and a normal single-sided copy state and a double-sided copy between a paper discharge port provided in a movable swing cover. A second branch guide member for switching the state, a pair of upper and lower transport rollers between the first and second branch guide members, and a downstream side of the second branch guide member when viewed in the paper transport direction. Compound copy including a pair of upper and lower paper discharge rollers and a return guide unit that guides the paper after the first transfer process toward the transfer unit again for composite copying or double-sided copying In the paper transport mechanism of the machine, a unit that swings in the direction away from the main body of the copying machine according to the opening / closing operation of the swing cover is provided in the main body of the copying machine, and the swinging of the unit is predetermined on the main body side of the copying machine. A regulation member that regulates within the swing angle is provided, and the swing cover continues to swing even after the unit cannot swing beyond a predetermined swing angle due to the restraint member. A space between the unit and the unit is opened, the first and second branch guide members and the upper roller of the conveying roller pair are provided on the copying machine body side, and the lower roller of the conveying roller pair is provided. And a lower roller of the paper discharge roller pair and the return guide are provided on the unit side, and an upper roller of the paper discharge roller pair is further provided on the swing cover side. Paper transport A mechanism is provided so that when the swing cover is opened, the gap between the upper and lower rollers of each roller pair and the first and second branch guide members provided on the copying machine main body side and the guide member on the unit side are automatically provided. The gap between them is widened, and jam clearance can be performed easily. At this time, since the swing cover can be further swung even after the swing of the unit is restricted, the gap between the unit and the swing cover as well as between the unit and the copying machine main body is widened. Since the unit can be observed in a completely exposed state, that is, from the top and bottom, and the front and the rear thereof, the ease of jam handling is greatly improved. Further, when the swing cover is closed, the lower rollers move upward in conjunction with it, and the original roller pairs are formed at predetermined positions. Therefore, there is no need for readjustment, and the operation is extremely simple.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a paper transporting mechanism of an embodiment of the present invention in which a swing cover is closed, and FIG. 2 shows a state in which the swing cover is slightly opened. 1 and 3 are diagrams corresponding to FIG. 1 and FIG. 4, showing a state in which the swing cover is wide open.
The figure is a view corresponding to FIG. 1 showing a state where the swing cover is completely opened. (Explanation of reference numerals) 1 ... paper transport mechanism 2 ... first branch guide member 3 ... transport roller pair _3a ... upper roller, _3b ... lower roller 4 ... second branch guide member 5 …… Paper ejection roller pair 5 _a …… Upper roller, 5 _b …… Lower roller 6 …… Reversing roller, 8 …… Swing cover 10 …… Unit, 11 …… Spindle 12 …… Support roller, 13… … Spindle 14 …… Cam surface, 15 …… Flat spring E …… Fixing section exit.

Claims (1)

(57) [Claims] A composite copying machine having a double-sided copying function and a composite copying function in addition to a normal single-sided copying function, which is provided on an exit of a fixing unit provided on the copying machine main body and on a swing cover swingable with respect to the main body of the copying machine. A first branch guide member for switching between a normal single-sided copy state or a double-sided copy state and a composite copy state, and a second branch guide for switching between a normal single-sided copy state and a double-sided copy state. Member and a pair of upper and lower conveying rollers between the first and second branch guide members, and a pair of upper and lower discharge roller pairs provided on the downstream side of the second branch guide member when viewed in the paper conveying direction. And a paper return mechanism for guiding the paper after the first transfer processing to the transfer section again for composite copying or double-sided copying. A unit that swings in a direction away from the copying machine main body when the swinging cover is opened and closed is provided in the copying machine main body, and the swinging of the unit is restricted within a predetermined swing angle on the copying machine main body side. Is provided, and the swing cover continues to swing even after the unit is unable to swing beyond a predetermined swing angle due to the limit member, and the swing cover continues to swing between the swing cover and the unit. A space is opened, the first and second branch guide members and the upper roller of the conveying roller pair are provided on the copying machine main body side, and the lower roller of the conveying roller pair and the discharge roller pair are provided. A paper transport mechanism for a multifunction copying machine, wherein a lower roller and the return guide are provided on the unit side, and an upper roller of the paper discharge roller pair is provided on the swing cover side. 2. A cam-shaped portion provided on the swing cover abuts on and supports the unit. When the swing cover is opened downward, the contact position of the unit with respect to the cam-like portion changes. The first unit is configured to swing with the swing of the swing cover.
A paper transport mechanism of the compound copying machine according to the item. 3. The compound copying machine according to claim 1 or 2, wherein the restriction member is formed of an elastic member, and the unit can be slightly opened from a contact position with the restriction member. Paper transport mechanism.