JPH0512258B2 - - Google Patents

Description

Detailed Description of the Invention <Technical Field> The present invention relates to a device for conveying sheet materials such as copy paper, transfer paper, and original documents to be read, and particularly to a device for conveying sheet materials such as copy paper, transfer paper, and original documents to be read. The present invention relates to a device that grips and conveys sheet materials to ensure reliable conveyance one by one.

<Prior art> Conventionally, as a device for conveying sheet materials such as sheet-shaped paper or manuscripts one by one to a predetermined position,
It is common and widely used that the sheet material to be conveyed is picked up by a paper feed roller or the like and is sandwiched between a pair of rollers and conveyed one by one.

A device using this pair of rollers uses friction between the rollers to perform conveyance. Therefore, it may easily damage the sheet material (original) or stain the surface of the sheet material.
Easy to slip on art paper and coated paper, which have a low coefficient of surface friction. Furthermore, there are many other drawbacks, such as the tendency to make conveyance errors due to a drop in the coefficient of friction caused by changes in paper powder or roller material over time, and the tendency to meander due to unbalanced roller shapes during the conveyance process. have.

In order to eliminate these drawbacks, various devices have been proposed that use air suction to adsorb sheet materials and convey the adsorbed sheet materials.

This device using air suction connects a sheet material suction section with an air suction port on the bottom and a suction air casing with a negative pressure chamber inside, and the bottom surface of the sheet material is connected to the bottom surface of the sheet material suction section. The structure is such that the sheet material is adsorbed and conveyed while being in contact with one side of the adsorbed sheet material by rotation of a friction member such as a belt or roller provided on the bottom surface.

However, when the above-mentioned sheet material conveying device handles thin sheet materials, for example, if the suction force is too strong, the sheet material is likely to be damaged, and conversely, if the suction force is too weak, the sheet material is likely to be suctioned incorrectly. Not only is it difficult to adjust the suction force, and when thin and thick sheets are mixed, it is difficult to convey due to the above reasons. Since the sheet material is not pressed from both sides, there is a high risk of meandering occurring.

On the other hand, there is also a sheet material conveying device in which a driving member such as a chain is directly connected to the vicinity of both sides of the document gripping portion, but due to constraints from the driving device such as the chain, it is difficult to provide a small and highly accurate device. is difficult.

Furthermore, with each of the above-mentioned devices, when performing double-sided reading of a sheet material with double-sided images, the device becomes complicated and large, causing frequent troubles during transportation.
It is unsuitable for devices that require reliability.

<Objective of the Invention> In view of the above-mentioned drawbacks, the present invention not only aligns slanted sheet materials without staining or damaging the sheet materials or causing conveyance errors, but also aligns sheet materials on both sides. It is an object of the present invention to provide a small and highly reliable document conveying device having a function of reversing a sheet material for reading an image, and a novel document conveying method using the reversing operation.

<Example> Below, according to the drawings showing an example of the present invention,
The document conveying device of the present invention will be explained in detail.

FIG. 1 is a schematic perspective view of the document conveying device according to the present invention, FIG. 2 is a partial sectional view of the document conveying device according to the present invention, FIG. 3 is a partial side view of the present invention, and FIG. 4 is an operation of the present invention. FIGS. 5a and 5b are explanatory diagrams for explaining the reversing operation. Identical parts are given the same reference numerals.

In the figure, reference numeral 1 indicates a base plate of the document conveying device, and two frames 2 and 3 connected to stays 35 and 36 are provided on the base plate 1. A first arm support shaft 4 is attached to the upper part of the frames 2 and 3.
and 4' (see FIG. 2).

A rotating member (not shown) is provided inside the first arm 5 via a plurality of bearings 80, and the rotating member includes a shaft fixing plate 53 for attaching to the alignment support shaft 52, and a gear attachment. A pipe 55 is attached, and a main shaft support block 16 is provided via a bearing 50 to an alignment support shaft 52 attached to the shaft rotation plate 53.
The main shaft 11 passes through the inside of the main shaft support block 16 via a bearing 51, and a solenoid mounting pipe 56 is provided on the outside of the main shaft 11 so as to be connected to the main shaft support block 16.

Next, reference numerals 9 and 10 indicate document gripping plates, each of which has an elastic friction member (not shown) inside its tip. These document gripping plates 9 and 10 are attached to the main shaft 11 by gripping plate fixing blocks 1, respectively.
2 and 13 so as to be rotatable around the main shaft 11, but the upper document gripping section 9 is installed inside the first arm 5 through a gripping plate fixing block 12 and a clutch 15. The main shaft support block 16 is fixed perpendicularly to the rotational axis of the main shaft support block 16. On the other hand, the lower document gripping plate 1
0 is completely free to rotate around the main shaft 11, but the lower document gripping plate 10 is kept at a certain level by a spring member (not shown) stretched between it and the upper document gripping plate 9. The upper document gripping plate 9 is configured to come into contact with the upper document gripping plate 9 at the elastic friction members provided at the respective tips.
The document gripping plates 9 and 10 are positioned on the main shaft 11 by respective mounting blocks 12 and 13, but are restrained by a plurality of stoppers 14 so as not to shift as a whole. The main shaft 1 also includes document gripping plates 9 and 10.
1 passes through the inside of the aforementioned main shaft support block 16, clutch 15, soletoid mounting pipe 56, and grip plate fixing blocks 12, 13 via a plurality of bearings 51, and the main shaft mounting block 16, clutch 15, Solenoid mounting pipe 56 and grip plate fixing block 1
2, 13 and main shaft 11 are stopper 1
4 and a latch attachment unit 27 provided at the end 57 of the main shaft 11 to prevent slippage.

The main shaft 11 has a latch mounting unit 27 and a latch 26 provided at its end 57.
The main shaft support block 16, clutch 15, and solenoid are connected to the main shaft support block 16, the clutch 15, and the solenoid at a certain angle via a plurality of bearings 51 by the ON/OFF operation of the solenoid 23 attached to the solenoid mounting plate 24 fixed to the solenoid mounting pipe 56 via the solenoid mounting plate 24. It rotates inside the mounting pipe 56 and the grip plate fixing blocks 12 and 13. Due to this rotational movement, the force of the spring material is applied between the lower document gripping plate 10 and the upper document gripping plate 9 by a gripping plate opener (not shown) attached to the main shaft 11. It is pulled away from the upper document holding plate 9 by a certain amount against the force. That is, the ON/OFF operation of the solenoid 23 causes the document gripping plates 9 and 10 to open and close (indicated by arrow C in the figure). Next, the main shaft 11 connected to the main shaft support block 16, document gripping plates 9, 10, clutch 15,
The solenoid mounting pipe 56 and the like are attached to an alignment support shaft 52 that is attached to a shaft fixing plate 53 via a bearing 50.
It is configured to move in the direction of arrow D in the figure within a certain range centered on , and its driving source is the alignment motor 22. This alignment motor 22 is connected to an alignment motor mounting plate 3 provided on an alignment motor mounting block 31 attached to a gear mounting pipe 55.
3, and an alignment cam 45 and a slit 85 for detecting the position of the alignment cam are provided at the tip of the output shaft.

On the other hand, the above-mentioned solenoid mounting block 32 has an alignment cam, and the follower 28 is attached to the follower mounting plate 29.
The alignment cam 45 and the spring 40 are used to abut the alignment cam 45 and the spring 40, and the alignment motor 22 drives the alignment motor 22 in the direction indicated by the arrow D in the figure.
A movement in the direction will be made.

Next, each of the series of component parts described above is configured to rotate within a certain range in the direction of arrow B in the figure via the bearing 80 provided inside the first arm 5, as described above. This drive source is a motor 17 for rotating the document gripping plate, and the motor 17 is connected to the motor mounting plate 2 for rotating the document gripping plate fixed to the first arm 5.
5, and a worm (not shown) provided on its output shaft is connected to a worm wheel 30 fixed to a gear mounting pipe 55, and its rotation range is also fixed to the gear mounting pipe 55. It is controlled by a timing slit 7 based on a signal from a sensor 8 attached to the first arm 5.

As described above, when the document gripping plate rotation motor 17 is driven, the alignment motor 22 and the solenoid 23
The original holding plates 9 and 10 also move simultaneously.

Next, the first arm 5 is connected to the first arm support shafts 4 and 4'.
It is provided so as to be rotatable within a certain range in the direction shown by arrow A in the figure, with the fulcrum being a fulcrum, and its driving source is a motor 6, which is attached to a motor mounting plate 68 on the base plate 1. has been done. The first arm 5 is controlled and driven based on a signal from a sensor 21 via a timing slit 20 and a signal from a switch (not shown) provided on a stay 35 via a gear train (not shown) provided on the frame 3. be done. In addition, the above timing slit 2
0 is provided coaxially with a gear (not shown) via the gear train, and the sensor 21 is provided on the base plate 1.

Therefore, from the above, the alignment motor 22 and solenoid 23 that drive the motor 6, as well as the document gripping plate rotation motor 17, rotate at the same time.

As described above, all the mechanisms for performing the operations indicated by arrows A, B, C, and D in the figure are provided on the base plate 1, and this base plate 1 is moved by the transport motor 90 as shown by the arrows. It will be moved in the E direction.

First, a slider 60 having a plurality of bearing members 38 therein and a plurality of bearing rollers 65 are provided at the bottom of the base plate 1. The slider 60 is provided on a sliding shaft 70 which is fixed to an external frame (not shown) via a bearing member 38, and a driving wire 100 is attached to the lower part of the slider 60. On the other hand, the bearing roller 65 is configured to be able to freely rotate on a guide rail 75 which is also fixed to an external frame or the like. The drive wire 100 is passed around a main pulley 91 attached to the transport motor 90 via a plurality of auxiliary pulleys 95, a tension pulley (not shown), etc., and transmits the movement of the transport motor 90. . At this time, the movement of the entire document conveyance device in the direction of arrow E is controlled based on signals from a sensor (also not shown) and a plurality of switches through a timing slit (not shown) provided on the output shaft of the conveyance motor 90. ing.

Further, reference numeral 76 is a support of the reversing auxiliary cover 81, and as shown in the figure, the document gripping portion protrudes from the opposite side. The reversal auxiliary cover 81 is
6 through a bearing material (not shown).

Next, the operation of the document conveying apparatus of the present invention constructed as described above will be explained with reference to FIG.

FIG. 4 shows the steps of a document reading device as an embodiment using the document conveying device according to the present invention. In FIG. 4, reference numeral 67 indicates the upper surface of the platen glass, and reference numeral 105 indicates an original suction device that pulls up the original P to a predetermined paper feeding position by, for example, air suction. Further, reference numeral 88 indicates the tip end portions of the document gripping plates 9 and 10, and P indicates a sheet-like paper to be conveyed.

After first setting the mode for single-sided or double-sided scanning of the original, an instruction is given to start reading the original.First, the process for single-sided scanning will be explained.

When you instruct to start reading the original, the original suction device 1
05 moves the original P to the predetermined paper feeding position shown in FIG. 4a.
I'm going to pull it up. At this time, the document conveyance device is in the standby position and is not in operation.

Next, after confirming that the document P has been pulled up by the document suction device 105, as shown in FIG. The tip 88 of the document gripping portion is moved by each independent movement of the motor 17.
The document conveying device moves forward so as to substantially follow the trajectory indicated by A in FIG. At the same time as this forward movement is started, the document gripping sections 9 and 10 are brought into an open state by the action of the solenoid 23. When the edge of the document is detected by the action of two pairs of sensors (composed of 18 and 19) for detecting the edge of the document, the solenoid 23 is turned off at the same time as the document feeder stops, and the document is gripped. Part 9 and 1
0 will be closed by the action of the spring stretched between them. In this state, as shown in FIG. 3c, the end of the document P is sandwiched between the elastic friction members provided at the tips of the document gripping plates 9 and 10. However, when the document P pulled up into the document suction device 105 is set diagonally, the two pairs of sensors detect the tilt by the drive of the alignment motor 22 and the action of the cam 45 and the cam follower 28. An operation is performed in which the end of the original document P which has become flattened is held between the document gripping plates 9 and 10 by the same distance over the entire gripping section.

The original P held between the original holding plates 9 and 10 in the manner described above is conveyed in the direction shown by arrow E in FIG. 3C, and then stopped at the position shown in FIG. It will be done. This operation is performed by a position detection means (not shown). If the document P held at this time is slanted as described above, the alignment motor 22
is driven or stopped, and the document is positioned so that it is parallel to the document reading sensor. That is, an alignment operation is performed. After stopping at this original reading position, the reading surface of the original is placed on the platen glass 6.
After the document gripping plates 9 and 10 have rotated a certain angle while sandwiching the document P to make it easier to touch the document P, that is, after the tip 88 of the document gripping portion has come into almost contact with the upper surface 67 of the platen glass, the document is read. An action is taken. As described above, the original P whose one side has been read is rotated by the first arm 5 as shown in FIG.

This reversing operation is performed when the document P held by the document gripping section
is a support 7 protruding from the side opposite to the document gripping portion.
This is accomplished by rotating around a reversal assisting bar 81 that is rotatably provided around the reversing member 6 via a bearing material (not shown). (See Figure 1). This reversing auxiliary bar 81 is particularly effective when, for example, as shown in FIG. 5a, the document cannot be turned over only by the rotating operation of the document gripping section, that is, the document is weak. Of course, it goes without saying that this method is effective even when the original paper is stiff, as shown in FIG. 5b. Then, as shown in FIG. 4f, the original P is conveyed in the direction of the arrow E', so that the original P can be completely turned over without being damaged or soiled. After that, the same figure
As shown in the figure, the paper is stopped according to its size, and then the document is conveyed again in the direction shown by the arrow E in the same figure h, and when it reaches the same position as when the document was reversed, the document is gripped as shown in the figure i. The plates 9 and 10 are opened and the original P is ejected. Next, by rotating the first arm 5 and document gripping parts 9 and 10 as shown in j in the same figure, that is, by performing the reversal of the above-mentioned reversing operation (shown in e in the same figure), the state shown in the solid line in the same figure is obtained, as indicated by the arrow E' It moves in the direction shown in FIG.

Next, the case of reading both sides of a document will be explained.

The same explanation will be given with reference to FIG. 4, but since the operation from instructing the start of reading the original to reversing the original (see e in FIG. 4) is the same as in the case of single-sided reading, the description will be omitted. Next, move the reversed original P to the arrow f in the same figure.
After conveying the document in the direction shown by E' and stopping the document conveying device at the reversed document reading position shown in g in the same figure, the leading edge 88 of the document gripping portion almost touches the top surface 67 of the platen glass, as in the case of single-sided scanning. The reading operation of the original is performed while the two are in contact with each other. The document P whose both sides have been scanned in the above manner is indicated by the arrow E in the figure h.
It is transported in the direction indicated by . The following operations are also the same as in the case of single-sided reading, and will therefore be omitted.

However, the original P sucked by the original suction device 105
If there is a large deviation, the document conveying device moves forward until the aforementioned sensors 18 and 19 provided at the document gripping section of the document conveying device detect the edge of the document, and the first arm 5 and the document gripping section move forward. Although the respective operations such as rotation of the plates 9 and 10 continue, there is a limit to this, namely, a part of the document transport device and the document transport device 1.
When the gripper 05 reaches a position where it starts to make contact, a limit switch (not shown) stops these operations and reports that the document cannot be gripped.

Furthermore, in this device, if the gripped document shifts or falls during transportation, the sensors 18 and 19 detect the presence or absence of the document and immediately stop all operations. The system is configured to report the same information as well as the actual situation.

<Effects> As described above, the document conveying device according to the present invention grips and conveys the sheet material, so unlike the conventional device which conveys the sheet material using a friction member, the document conveying device according to the present invention does not stain or damage the sheet material. It is possible to reliably feed the sheet material without causing any errors or conveyance errors.

Furthermore, since the sheet materials that are slanted are not only aligned but also conveyed while being gripped, there is no risk of meandering occurring.

Furthermore, it is also equipped with a sheet material reversing function for reading double-sided images, making it possible to provide a compact and highly reliable document conveying device.

[Brief explanation of drawings]

1 is a schematic perspective view of a document conveying device according to the present invention, FIG. 2 is a partial cross-sectional view of the document conveying device according to the present invention, and FIG. 3 is a partial side view viewed from the direction indicated by arrow H in FIG. , FIGS. 4a to 4j are explanatory diagrams for explaining the operation of the present invention, and FIGS. 5a and 5b are explanatory diagrams for explaining the reversing operation. 1... base plate, 2, 3... frame, 5... first
Arm, 6... First arm rotation motor, 7, 2
0,85...slit disk, 8,21,86...
Sensor, 9, 10...Document holding plate, 11...Main shaft, 17...Document holding plate rotation motor, 18, 19...Sensor, 22...Alignment motor, 23...Solenoid, 28...Cam follower , 31... alignment motor mounting block, 32...
... Solenoid mounting block, 45 ... Cam, 55
... Gear mounting pipe, 56 ... Solenoid mounting pipe, 60 ... Slider, 65 ... Bearing roller, 70 ... Slide shaft, 75 ...
...Guide rail, 81...Document reversal auxiliary cover,
105... Document suction device, P... Sheet material.

Claims (1)

[Scope of Claims] 1. A document gripping section that grips a document, a rotating section that rotates the document holding section about a predetermined fulcrum, and a moving section that moves the document holding section and the rotating section. In the document conveying/reversing device, a specific bar is provided at a predetermined position, and the document gripping portion that grips the document is moved and rotated around the bar,
A document conveying and reversing device comprising a document reversing means for reversing the document by wrapping one side of the document.