JPH0639308B2 - Duplex copying machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided copying apparatus, and more particularly to a double-sided copying apparatus capable of correctly storing a recording sheet after single-sided copying in a stacker. [Background of the Invention] Generally, in a double-sided copying machine, after a recording sheet copied on one side in a copying section is accommodated in a stacker provided below the copying section, the recording sheet is re-fed from the stacker to the copying section to copy both sides. However, it is necessary to store the recording paper in this stacker in a state where it can be easily re-fed. However, in a conventional double-sided copying machine, a friction wheel (which may be a friction belt) is mounted on a friction wheel (which may be a friction belt) which can be rotated in a direction in which the recording paper after one-sided copying is accommodated in the stacker and a direction in which the recording paper is re-fed from the stacker to the copying unit. When the friction wheel rotates in the direction to accommodate the recording paper, it rotates freely, and when it rotates in the direction to re-feed, it does not rotate. However, there was a drawback that the trailing edge would fall at the position and could not be stored correctly on the stacker. Also, if the recording paper is not correctly stored on the stacker, there is a risk of jamming when re-feeding it. SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a double-sided copying apparatus that can correctly store a recording sheet after single-sided copying in a stacker and reliably re-feed the recording sheet from the stacker. It is said. In order to achieve the above object, the present invention comprises a friction member that can rotate in a direction in which the recording paper after single-sided copying is accommodated in the stacker and a direction in which the recording paper is re-fed from the stacker to the copying unit, A double-sided copying apparatus in which a multi-feed preventing roller is pressed against the friction member when the friction member rotates in the direction for accommodating recording paper, and does not rotate when it rotates in the direction for re-feeding, An auxiliary roller pivotally supported by a lever extending rotatably from the shaft of the double feed prevention roller is brought into pressure contact with the lower surface of the friction member. [Embodiment] Next, the present invention will be described based on an embodiment shown in the accompanying drawings. In the figure, 1 is a copying apparatus main body, 2 is a primary paper feeding means,
The primary paper feeding means 2 includes a first paper feeding portion 2a for feeding the recording papers 3 stored in a cassette (not shown) one by one, and a copying portion 4.
And a second sheet feeding section 2b provided in the middle of the path leading to.
5 is a conveyor belt for the recording paper 3 copied by the copying unit 4, 6 is a fixing unit for the recording paper 3 sent by the conveyor belt 5, 7
Is a paper ejection unit for ejecting the recording paper 3 after fixing. Reference numeral 8 is a guide roller provided so as to be partially exposed on a paper discharge path 9 connecting the fixing unit 6 and the paper discharge unit 7. The guide roller 8 can be positively rotated in the paper discharge direction. ．
Reference numeral 10 denotes a movable guide plate whose front end is curved so as to cover the guide roller 8 from the side of the paper discharge unit 7. The movable guide plate 10 has a base end portion via a shaft 11 on the frame body of the paper discharge unit 7. A position P, which is pivotally supported and covers the guide roller 8 by the operation of a solenoid (not shown), and a retracted position P'can be selected (see I and II in FIG. 2). Reference numeral 12 denotes a double-sided unit attached to the lower surface of the copying apparatus main body 1. The double-sided unit 12 linearly directs the recording paper 3 flowing down along the movable guide plate 10 toward the primary paper feeding means 2 side of the copying apparatus main body 1. It is composed of a first unit 12a having a transporting path 13 for efficiently transporting it and a second unit 12b having a stacker 26. The second unit 12b is connected to the first unit 12a via a hinge portion 14,
It can be opened as shown in Fig. 3. Reference numeral 15 is a spring member for supporting the opened second unit 12b, and 16 is the pin 16 'of the second unit 12b.
It is a locking member that locks to. The transport path 13 includes an upper plate 131 that constitutes the upper surface of the duplex unit 12, and a lower plate 133 that has a base end portion rotatably attached to the upper plate 131 via a shaft 132. Reference numeral 134 denotes a feed roller pivotally supported by the upper plate 131 so that a part of the lower plate 133 is exposed to the inside of the conveying path 13.
A pressure roller 135 pivotally supported is in pressure contact with the tip of a spring member 136 fixed to the. Reference numeral 17 denotes a secondary paper feeding means provided on the front side of the carrying section 13 in the carrying direction.
The friction wheel 19 fixed to the central portion of the shaft 18 inserted between the side frames of the second unit 12b, and the rotation capable of rotating about the pin 20a on the mounting member 12b 'raised from the bottom of the second unit 12b. A double feed prevention roller 20 that is axially supported by the frame 20b and is pressed against the friction wheel 19 from its outer surface by the action of the spring member 20c, and a tip end portion of the lever 20e that is loosely fitted to the shaft 20d of the double feed prevention roller 20. Is supported by the spring member 20
The auxiliary roller 21 is in pressure contact with the lower surface of the friction wheel 19 by the action of f. The friction wheel 19 is the second paper feed section 2b of the primary paper feed means 2.
Gear 2 which is connected to the drive shaft 2b 'of the above and rotates in the direction of arrow a
2 is a drive source and is connected to a gear A provided at one end of the shaft 18 and a gear B provided at the other end, so that both gear A and B are connected to the solenoids 23 and 24.
By switching by the action of
Direction), that is, the direction in which the recording paper after one-sided copying is accommodated in the stacker 26 and the direction in which the recording paper is re-fed from the stacker 26 to the copying unit can be rotated. Also,
The multi-feed preventing roller 20 rotates freely when the friction wheel 19 rotates in the direction in which the recording paper is accommodated (arrow b'direction), and does not rotate in the direction for re-feeding (arrow a). One way clutch is built in like this. Further, the auxiliary roller 21 rotates in the same direction as the auxiliary roller 21 due to friction with the friction wheel 19. Reference numeral 25 is a member for abutting the leading end of the recording paper 3 provided on the floor plate of the stacker 26, and 27 is a lateral width regulating plate. The tip end abutting member 25 and the lateral width regulation plate 27 are moved by a movement urging means (not shown), and are automatically adjusted according to the size of the recording paper. 28 is a push-up plate that pushes up the recording paper 3 prior to the rotation of the friction wheel 19 in the direction of the arrow b after the predetermined number of one-sided copied recording paper 3 is stored in the stacker 26, and 29 is the friction wheel 19. This is the re-feeding path of the recording paper 3 sent out by friction. In the above-described embodiment, when the size of the recording paper is designated when copying, the lateral width regulating plate 27 and the leading end abutting member 25 are moved according to the size of the recording paper, and when the copy button is pressed, scanning of the original is performed. The recording paper is fed from the primary paper feeding means and copied in the copying section 4. The recording paper 3 after one-sided copying is fixed, passes through the movable guide plate 10, and is conveyed to the conveying path 13.
It is conveyed to the secondary paper feeding means 17 through the inside, and the friction wheel 19
And the double feed prevention roller 20 pressed against the friction wheel 19 and housed in the stacker 26 as shown in FIG. Since the auxiliary roller 21 is pressed against the lower surface side of the friction wheel 19 during this storage, the recording paper 3 is surely sent to a position where it is correctly abutted against the leading end abutting member 25 provided in the stacker 26, and 6 As shown in Fig. II, the trailing edge of the recording paper (the leading edge when re-feeding) is neatly aligned. In addition, the stacker 26 copies the predetermined number of single-sided recording sheets 3 onto the copy unit 4
When the paper is re-fed to, the push-up plate 28 moves up before the friction wheel 19 rotates in the direction of the arrow b as shown in FIG. 6 III so that the uppermost layer of the recording paper 3 is pressed against the friction wheel 19. The rotation of the friction wheel 19 causes the recording paper to bite into the auxiliary roller 21 and is sent out through the re-feeding path. Here, when the recording paper 3 fed from the primary paper feeding means 2 to the copying section 4 is re-fed by the secondary paper feeding means 17 as shown in FIG. That is, is fed from the primary sheet feeding means 2 with the upper side up, is the state where one side is copied on the upper side in the copying section, and is reversed at the installation part of the movable guide plate 10 and the second side is up. With the
After being fed to the primary sheet feeding means 2 side by the conveying section 13 in the double-sided unit 12, the state of passing through the accommodating path to the stacker and the state of being accommodated in the stacker 26 with the upper side facing up are The state of joining the recording sheet path of the primary sheet feeding means 2 through the re-feeding path common to the storage path, the state of being supplied to the copying section 4 with the second side up, and the state of being discharged on both sides after being copied. This is the state. In the above embodiment, the friction wheel is shown as a friction member that can be rotated in the direction in which the recording paper is stored in the stacker and in the direction in which the recording paper is re-fed from the stacker, but a friction belt may of course be used. Is. As described above, in the double-sided copying apparatus according to the present invention, the friction member that can rotate in the direction in which the recording paper after single-sided copying is accommodated in the stacker and the direction in which the recording paper is re-fed from the stacker to the copying unit is used. A double-sided copy in which a multi-feed preventing roller is pressure-contacted to the friction member when the friction member rotates in the recording paper accommodation direction and does not rotate when it rotates in the refeeding direction. In the apparatus, an auxiliary roller pivotally supported by a lever rotatably extending from the shaft of the double feed prevention roller is pressed against the lower surface of the friction member, so that the recording paper stored in the stacker is stacked. The paper is correctly and reliably fed into the inside, the rear end (the front end when re-feeding) is properly aligned, and when the recording paper is re-fed from the stacker, the recording paper is surely eaten into the friction member. It has an excellent effect that it can be inserted.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall sectional view,
2 I and II are sectional views showing the action of the movable guide plate, and FIG.
FIG. 4 is a sectional view of the double-sided unit with the second unit opened, FIG. 4 is a perspective view showing the forward / reverse rotation mechanism of the friction member of the secondary sheet feeding means, and FIG. 5 is a double feed prevention roller and an auxiliary roller. 6 is a perspective view showing the operation of the secondary paper feeding means, and FIG. 7 is an explanatory view of the passage process of the recording paper. 1 ... Copying device main body, 2 ... Primary paper feeding means 3 ... Recording paper, 4 ... Copying section 17 ... Secondary paper feeding means, 19 ... Friction wheel (friction member) 20 ... Double feed prevention roller , 20d …… Axis 20e …… Lever, 21 …… Auxiliary roller 26 …… Stacker

Claims (1)

[Claims] 1. A friction member is provided which is rotatable in a direction in which a recording sheet after one-sided copying is accommodated in a stacker and in a direction in which the recording sheet is re-fed from the stacker to a copying unit, and the friction member is provided on the friction member. In a double-sided copying apparatus in which a multi-feed preventing roller is pressed against the lower surface of the friction member, the multi-feed preventing roller is rotated freely when rotating in the direction of accommodating paper and does not rotate when rotating in the direction of re-feeding. A double-sided copying machine characterized in that an auxiliary roller pivotally supported by a lever rotatably extended from the shaft is pressed.