JPS58207247A - Paper reversing device - Google Patents

Abstract

PURPOSE:To prevent paper from skewing in case of switching back paper by setting the interval between paired rollers and the interval between the paired rollers and transport means shorter than the minimum length of paper to be used. CONSTITUTION:A sheet 15 is clamped and transported by a pair of rollers 8, 9 to a non-circular roller 13 and a driven roller 14. The trailed edge of the sheet 15 is detected by detecting means 11, 12, and a fixed time later, before the trailing edge of the sheet 15 passes through the rollers 8, 9, the non-circular roller 13 starts to rotate in direction of an arrow A so as to clamp the sheet with the driven roller 14 and further transport the sheet. At this time, as the interval between the paired rollers 8, 9 and the paired rollers 13, 14 is shoter than the length of the sheet, the sheet 15 is clamped by at least either the paired rollers 8, 9 or the paired rollers 13, 14, so as to prevent paper from skewing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper reversing device for reversing paper during the course of conveying the paper in copying machines, printing machines, etc., and particularly to a paper reversing device for reversing the paper in the middle of conveying the paper. The paper is turned into a paper reversing device 14 for reversing the paper.

In this type of device, paper that has been sent along a conveyance path from a copying machine, a printing machine, etc. is introduced into a switchback section of a reversing device by a carrying means, and a general digit transfer means in the switchback section is corrected. The paper is further fed into the switchback section by rotating the paper, and the paper is reversed by reversing the conveyance means, and the paper is reversed by being returned to the conveyance path by the discharge means. There is.

However, in a reversing device that reverses the paper by rotating the transport means in the forward and reverse directions, it is very difficult to carry in the next sheet while the transport means is rotating in the reverse direction. be. Therefore, such a reversing device is not suitable as a paper reversing mechanism for high-speed copying machines and the like.

A reversing device as disclosed in US Pat. No. 3,944,212 has been proposed as a device that performs high-speed reversing in order to be compatible with such high-speed copying machines and the like.

Such a reversing device is shown schematically in FIG.

This reversing device includes a switchback section, a triple 0-ra 1.2, 3 that acts as a carry-in means for carrying paper into the switchback section and a carry-out means for carrying out the paper from the switchback section; - A non-perfect circle 0-54 that rotates approximately once in the paper reverse feeding direction, which acts as a conveying means to reversely feed the paper carried in by 51.2 and carry it out by 0-52.3, and this non-perfect circle. It is provided with a driven 0-ra 5 that follows the 0-ra, and detection means 6 and 7 for detecting that paper is introduced into the switchback section.

In the above-mentioned reversing device, the paper overflowing the conveyance path (not shown) K from the copying machine, printing machine, etc. is caught in the 0-roller 112 that acts as a conveyance means, and is transferred to the switchback section. ! be introduced within. At this time, since the non-perfect circle 0-54 is held at the illustrated position K, the paper is held at the 0-ra 4.
5 reaches switchback part A without being restrained by 12, this is detected by detection means 6.7, which detects
Due to the number δ, the non-perfect round roller 4 makes approximately one rotation in the direction of the arrow to reversely feed the paper. This paper is sandwiched between the rollers 2.3 and 2.3 as a carry-out means, and carried out to the above-mentioned conveyance path.

The above-mentioned reversing device rotates the non-perfect circular roller in the paper reverse direction immediately after the paper reaches the switchbar pick section to reversely feed the paper and carry it out, so it can perform the reversal at high speed. be able to. However, in this reversing device, when the paper is introduced into the switchback section, after the paper is separated from the carry-in 0-5112, the non-round D-ra 4 and the driven D-ra 5, which act as conveyance means, Before the action starts, the paper is separated from the 4= by any O-ra, thus causing skew when the paper is fed backwards by 0-54.5. This means that the conveying means performs a very unreliable conveying action.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reversing device that eliminates the drawbacks of conventional reversing devices as described above and can reliably perform reversing and conveyance without causing skew or the like when switching back paper. That's what I do.

4i: The reversing device according to the invention includes a conveying means for transporting the paper, which is accommodated in the conveyance path and fed into the switchback section by four people, a conveyance means introduced into the switchback section and for reversely conveying the round paper, and a conveyance means for reversely conveying the round paper from the conveyance means. In a paper reversing device equipped with a conveyance means for conveying out the paper to be transferred, the above-mentioned conveyance means usually consists of a pair of O-ra facing each other with an interval, and after the paper comes between the D-ra, the above-mentioned conveyance means is 0-5 of, and then,
A driving means for rotating the O-ra pair in the paper reverse feeding direction is provided, and a distance between the carrying means and the O-ra pair and the O-ra pair are provided.
- The distance between the pair of paper sheets and the above-mentioned carrying-out means is set to be F or less than the minimum length of the paper to be used.

This will be explained below with reference to F1 diagram piece 1.

The second part shows an embodiment of the present invention. In the diagram! is the switchback part, 8.9.1o is the 0-ra 1, 2 shown in Figure 1-c.
．． 3 and dK always turn +u1, -C shows the triple ○-ra which is used as the carrying means and the carrying-out + stage. Carrying roller 1.
In order to detect the paper being carried in at D-ra 8.
Paper detection means 11 and 12 for detecting the trailing edge of the paper on the stream side of 9.
is located. Sui 1 Sochibalik part by loading 0-ra 8.9! ! The conveying means for transporting the paper introduced in the 1st and 9th place is normally used for special numbers.
In the illustrated embodiment, it consists of a non-circular roller 13 that rotates in forward and reverse directions and a driven roller 14 driven by the non-circular roller 13. In the figure, 15 indicates paper.

The paper 15 is conveyed by being placed on the 0-ra pair 8.9, but after the paper comes between the D-ra pairs 13 and 14 (e), the non-round roller 13 is moved in the direction shown in the figure. #)
1. ]-The roller 13 and the roller J4 are brought into contact, and then the 0-
A driving means is provided which reversely feeds the paper by rotating the paper 13 in the direction B shown in the figure. Such driving means i
・C points will be explained in detail later with reference to the embodiment shown in FIG. In this way, the paper that is reversely fed by the rotation of the non-perfect circle 0-roller 13 in the B direction is conveyed out while being sandwiched between 0-5 and 8.9.

In the above device, the loading O-ra 8.9 and the O-ra pair 13
．． 14 and the distance between 0-5 and 13.14 and the unloading rollers 9 and 10, respectively, are set to be equal to or less than the minimum length of the paper to be used.

As mentioned above, according to the illustrated reversing device, the paper 15 is
The trailing edge of the paper 15 is detected by the detection means 11.12, and after a certain period of time, the paper 15 is rear end is 0
- A non-perfect circle 0-La 13 sent before it could get through 5 to 8.9>
Start rotating in the loading direction (front side) and move the paper to the driven ○-ra 1
4. Feed in more scissors, paper, and 15. At this time, the distance between O-La pair 8.9 and O-La pair 13.14 is shorter than the length of the paper, so paper 15 is 0-La pair 8.9,
Since at least one of the 0-ra pairs 13 and 14 is sandwiched between K, the paper is prevented from being skewed. Also, this subordinate fi JJ
Since the o-roller 14 is pushed toward the non-round D-roller 13 by a spring or the like, it escapes as the non-round roller 13 rotates,
This prevents large pressure from occurring. Therefore 0-
It is possible to reduce the impact caused by contact with the roller 13, and also to reduce the effects on paper such as paper folding due to large pressure. Further, the same effect can be obtained even if the driven roller 13 is made of foamed urethane with low hardness or the like. The above non-round roller 13
After starting, after a certain period of time, the trailing edge of the paper 15 becomes 0-5:1.
3. Before passing through 14, the non-perfect circle 0-513 rotates in the opposite direction (rotates in the B direction) by the mechanism shown in FIG. At this time, the trailing edge of the paper 15 has passed through the D-RA pair 8.9. Due to the reverse rotation of the non-perfect circle 0-513, the paper 15 is fed backwards and is sent out between the roller pairs 9 and 10. At this time as well, the paper 15 is sandwiched between at least one of the forces 0-L vs. 13.14 and 0-R vs. 9.10, so that the sheet will not be skewed.

Next, the driving means for the non-perfect round 0-ra will be explained with reference to FIG. 3, which shows an embodiment thereof.

The device shown in FIG. 3 rotates a non-perfect circular row 513 in forward and reverse directions. In the figure, 16 is an input ear, 17 is a shaft fixed to the input ear 16, and 18 is fixed to a shaft 17. 19 is an electromagnetic clutch mounted on the shaft 17, 20 is fixedly attached to the electromagnetic clutch 19. 21 is an idler ear that engages with the ear 20, and 22 is the non-round row 513. A fixed shaft, 23 is an ear that is not fixed to the shaft 22 and is engaged with A 21, 24 is an ear that is engaged with the above-mentioned f718, 25 is an ear that is not fixed to the shaft 22, and is engaged with A 21;
4. Overlap shinishizuri 5 Tsuchi, 26 fixed to 4.
27 is a coil spring attached to the collar 26, and 28 is a fill spring 270 that prevents rotation.

In the above-mentioned driving means, the ear 16 is connected to a driving source (not shown) and always rotates at a constant speed in the upward direction shown in the drawing. The electromagnetic clutch 19 normally quickly disconnects the shaft 17 rotated by the above 716 and the 4F20, but when the rear end of the paper 15 is detected by the detection means 11.12, the force is constant. Encouraged by time! +41
17 and -f720fc.

As described in 1 above, when the f716 is rotating in the input direction at a constant speed, the paper 15 is carried in, and after the predetermined time period, the trailing edge of the paper 15 is detected by the detection means 11 and 12P. The electromagnetic clutch 19 is energized, and the drive driven by the ear 16 is driven by the shaft 17, the electromagnetic clutch 19, the ear 20.
21.23, it is transmitted through the shaft 22 and rotates the non-perfect circle 0-ra 13 in the A direction. At the same time, the shaft 22 rotates the collar 26 fixed to the shaft 22 in the front direction, and the fill spring 27
Wrap tightly. At this time, the Opera Runniji Zukura Nosen 25 was spinning around.

When the non-perfect circle D-ra 13 starts rotating in the direction A, and after the certain period of time, the non-perfect circular D-ra 13 rotates approximately, the electromagnetic clutch 1
9 is deactivated. 'F! The shaft 22 attempts to rotate rapidly in the B direction due to the deenergization of the magnetic clutch 19 and the elastic deformation of the coil spring 270 which is tightened during forward rotation. However, the rotation of the shaft 22 in the direction B is transmitted to the ear 24 through the ear 16.
Since the overrun clutch 25 engages when the rotation speed is faster than the rotation in the B direction of the shaft 220B, the rotation in the B direction of the shaft 220B is faster than the rotation of the
Matches the rotation speed of 4. Here, the conveyance speed of the paper 15 by the non-perfect circular 0-ra 13 and the driven 0-514 is 3 consecutive 0-5
8.9.1゜The manual speed to 4A16, IA18.24 and 20゜2 so that it is equal to the loading and unloading speed by 1゜.
An f ratio of 3 is set.

Note that the above device is configured to control the electromagnetic clutch by detecting the trailing edge of the paper 15. If the electromagnetic clutch is controlled by detecting the leading edge of the paper, the method of detecting the leading edge of the paper will cause the trailing edge of the paper to change between 0-5 and 8.9 after the leading edge is detected depending on the size of the paper. Since the time taken to reach the reversal position differs when pulling out, the timing at which the electromagnetic clutch 19 is energized must be changed in each case. However, detecting the trailing edge of paper can be done by energizing the electromagnetic clutch 19 using the same timing mechanism even for various paper sizes. Compared to ]], the movement becomes very cumbersome.

Also, as mentioned above, the 0-ra pair 8.9 and 13.14 and the O-5 pair 13.14 and 9.10 (7) distance are smaller than the minimum size of the paper 15 to be used. With this control, the paper 15 can be sandwiched between any of the O-L pairs during this reversal, and the paper can be transported reliably.

As described above, the state in which the trailing edge of the paper is detected and the non-round roller is driven is shown in a diagram in FIG.

In FIG. 4, when the trailing edge of the paper is detected by the paper detection means 11.12, the delay device t (+) is first activated, and the delay device (1) is activated after a certain period of time. Operate this delay device (II
) and the driving Tanabata are synchronized, and the Tanabata is driven for a certain period of time.

As shown in FIG. 5, the delay device (1), (1) is a seven-way multivibrator 0M that receives a trigger pulse and functions as a timer using an OR circuit.

In order to drive Tanabata, it is sufficient to operate a switch shift element that amplifies and turns Tanabata ON -01rli'.

Various types of switch shift elements can be considered, such as relays, photo triacs, and photo thyristors, but one based on a beam relay is shown in FIG. In FIG. 6, the signal amplified by the driver causes a current to flow through the coil and pull the switch by magnetic force, turning on the switch and rotating the Tanabata.

FIG. 7 shows another embodiment of the invention. This uses a perfectly round 0-ra 29 as a substitute for the non-perfectly round 0-ra 13 in the above embodiment, and places it between the benevolence spaced apart from the driven 0-514 and the position where it engages with the driven 0-514. However, since the operation is exactly the same as in the previous embodiment, a detailed explanation thereof will be omitted.

FIG. 8 shows a central common 0-59 flanged portion 9'KO-let groove in the triple O-ra 8.9.10 used as loading means and unloading means in the above embodiment. Show what has been strained. In this way, 0
- By providing the left groove, the trailing end of the sheet 15, which is directed towards the carry-in side, can also be guided to the carry-out side due to equal curl pressure after being reversed, so that more reliable inversion can be performed. Also, the same effect can be obtained by using flocking or the like instead of the O-let groove.As explained above, according to the present invention, the D-ra constituting the conveying means for reversely feeding the paper is By rotating the paper in forward and reverse directions using a simple mechanism, it is possible to
Since it can be sandwiched between two pairs, reliable reversal without skewing can be performed at low cost. In addition, the above O-la is abbreviated as -
Because it only rotates back and forth, if the previous sheet is reversed and sandwiched between the next 0-ra pair, the next sheet can be immediately carried to the conveyor 0-ra for reverse feeding. Therefore, since the paper spacing can be reduced and the sheets overlap at the row 5, it is possible to reverse the sheets in a high-speed copying machine or the like.

Furthermore, since the paper is always sandwiched between one of the zero-ra pairs, this reversing device is not limited to the vertical orientation shown, but can be positioned at any angle. It can be adapted to various things such as reversal of . In addition, since the structure is simple, it has many advantages such as being very compact as a reversing mechanism.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a conventional sheet reversing device, FIG. 2 is a schematic side view of the main parts of a sheet reversing device according to an embodiment of the present invention, and FIG. 3 is an implementation of a driving means in the device according to FIG. A perspective view showing an example, a circuit diagram showing an example of a switch circuit, and FIGS. 7 and 8 show other embodiments of the present invention. 8.9, lO... Triple O-ra 11.12... Paper detection means 13... Non-perfect circular O-ra 14... Driven O-ra 1g-
... Electromagnetic clutch 25 ... Overrush clutch 27 ... Fill spring 29 ... Rocking O-ra Fig. 1 Ay5 direction Fig. 8 Fig. 8

Claims (1)

[Claims] A carry-in means for introducing the paper fed along the conveyance path into the switchback section, a conveyance means for carrying the paper introduced into the switchback section backward, and a carry-out means for carrying out the paper fed backward from the conveyance means. In the paper reversing device equipped with the above-mentioned paper reversing device, the above-mentioned conveyance means usually have 0-
It consists of a pair of 0 and 1 characters, and after the paper comes between 0 and 1, the above 0
- Providing a driving means for rotating the O-ra pair in the paper reverse feeding direction, and controlling the distance between the carrying means and the O-ra pair and the distance between the D-ra pair and the above-mentioned O-ra pair. A paper reversing device whose % mark is that the distance between the conveyance means and the output means is less than or equal to the minimum length of the paper used.