JPH0333619B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention places a sheet-shaped object to be scanned, such as a recording medium or a manuscript, on the upper surface of a flat movable table.
The present invention also relates to a plane scanning device that performs plane scanning by moving the movable table together with the object to be scanned.

Configuration of Conventional Example and Its Problems FIG. 1 shows a perspective view of a conventional plane scanning device of this type in a facsimile receiver. Reference numeral 1 denotes a guide shaft fixed to an apparatus main body (not shown), and a movable table 2 is supported on this guide shaft 1 so as to be movable along the guide shaft 1. 3 is guide shaft 1
The feed screw 3 is a feed screw provided in parallel with the feed screw 3, and the feed screw 3 is rotated by a feed screw drive device (not shown). In addition, the feed screw 3
, there is a half nut 4 attached to the moving table 2.
are screwed together. Therefore, when the feed screw 3 is rotated by the drive device, the movable table 2 moves along the guide shaft 1 and the feed screw 3.

A recording head (not shown) is provided above the moving path of the moving table 2. Also. A large number of small holes (not shown) are provided on the upper surface of the moving table 2, and these small holes are connected to a vacuum pump (not shown).

Brackets 5 and 6 are attached to a bed (not shown) provided in the main body of the apparatus near one end of the moving path of the moving table 2, and a supply pressure roller shaft 7 is attached to these brackets 5 and 6. It is rotatably supported. An appropriate number of supply pressure rollers 8 are fixed to the supply pressure roller shaft 7 (note that these supply pressure rollers 8 are pressed by a supply roller 16 described later,
(Some of these supply pressure rollers 8 are omitted from the illustration in order to illustrate them.) A gear 10 is fixed to the rotating shaft of the supply motor 9 attached to the bracket 6.
is the gear 1 fixed to the supply pressure roller shaft 7
It is engaged with 1.

A discharge pressure roller shaft (not shown) is rotatably supported near the other end of the moving path of the moving table 2 in the same manner as the supply roller shaft 7. Discharge pressure roller similar to pressure roller 8
ba (not shown) is fixed. The discharge pressure roller shaft is driven by a discharge side motor (not shown).

Near the rear end of the moving table 2, intermediate portions of a pair of left and right supply-side rotation plates 12 are rotatably supported via support shafts 13, and these supply-side rotation plates 12 One end portion is rotatably coupled to a movable core of a plunger solenoid 14 attached to the moving table 2. A supply roller shaft 15 is rotatably supported on the other end side of the supply side rotating plate 12, and a supply roller 16 is fixed to the supply roller shaft 15.

Between the supply side rotating plate 12 and the moving table 2,
A tension coil spring 17 is interposed, and this spring 17 rotates the supply side rotating plate 12 counterclockwise in the figure.
In other words, the supply roller 16 is biased in a downward direction.

In the vicinity of the front end of the movable table 2, intermediate portions of a pair of left and right discharge-side rotary plates 18 are rotatably supported via support shafts 19, and one end of these rotary plates 18 is rotatably coupled to a movable core of a plunger solenoid 20 attached to the moving table 2. A discharge roller shaft 21 is rotatably supported on the other end side of the discharge side rotating plate 18, and a discharge roller 22 is fixed to the discharge roller shaft 21.

Between the discharge side rotating plate 18 and the moving table 2,
A tension coil spring 23 is interposed, and this spring 23 rotates the discharge side rotating plate 18 counterclockwise in the figure.
That is, the discharge roller 22 is biased in the direction of descending.

In this conventional scanning device, when a sheet-shaped recording medium 24 made of aluminum alloy, paper, or the like is supplied onto the movable table 2, the movable table 2 is on standby at the position shown in the drawing. At this time, the supply side rotation plate 12 is rotated clockwise in the figure by the plunger solenoid 14, so that the supply roller 16
is pressed against the supply-side pressure roller 8 while projecting slightly upward from the top surface of the moving table 2 .

In this state, the supply pressure roller 8 is rotated by the supply side motor 9 via the gears 10 and 11 and the supply pressure roller shaft 7.
The recording medium 24 that has been supplied between the rollers 8 and 16 passes between the rollers 8 and 16, and is conveyed on the movable table 2 in the direction of arrow A.

At this time, since the supply roller 16 protrudes upward from the top surface of the movable table 2 as described above, the recording medium 24 is conveyed on the movable table 2 with its contact area with the movable table 2 being reduced. Ru. Therefore, the resistance to the movement of the recording medium 24 is reduced, and the recording medium 24 can be conveyed smoothly, and when the recording medium 24 is made of aluminum alloy or the like, the recording medium 24 can be conveyed more easily. It is possible to prevent the recording medium 24 and the top surface of the movable table 2 from being scratched.

Further, when the recording medium 24 is conveyed to the fixed position on the moving table 2 as described above, the plunger solenoid 14 is turned off, and the supply side rotating plate 12 is moved counterclockwise in the figure by the force of the spring 17. is rotated. As a result, the supply roller 16 is lowered from the upper surface of the movable table 2. At the same time, the vacuum pump starts a suction operation, and the recording medium 24 is transferred to the moving table 2.
is closely attached to the top surface of the

Subsequently, the feed screw 3 is rotated by the feed screw drive device, so that the movable table 2 moves in the direction of arrow B (the same direction as the direction of arrow A) along the guide shaft 1 and the feed screw 3, A scan is performed.

Also, after the scanning is completed, plunger solenoid 2
0 is turned on, the solenoid 20 rotates the discharge side rotation plate 18 clockwise in the figure, and the discharge roller 22
is made to protrude slightly above the upper surface of the movable table 2 to press the discharge roller 22 against the discharge pressure roller. Then, by rotating the ejection pressure roller shaft in this state, the recording medium 2
4 is discharged from the top of the moving table 2.

Here, also during this discharge, the discharge roller 22 protrudes slightly upward from the top surface of the movable table 2 as described above, so that the small hole provided on the top surface of the movable table 2 is communicated with the atmosphere, and the vacuum At the same time as the suction force disappears, the contact area of the recording medium 24 with the top surface of the moving table 2 is reduced, so the resistance to the movement of the recording medium 24 is reduced, the recording medium 24 is smoothly ejected, and the recording medium 24 is The upper surface of the recording medium 24 and the moving table 2 will not be scratched by the conveyance of the recording medium 24.

However, in this conventional device, a plunger solenoid is used to raise the supply roller 16 and discharge roller 22 when feeding the recording medium 24 to the movable table 2 and when discharging the recording medium 24 from the movable table 2, respectively. A relatively complicated movable mechanism consisting of 14, 20, rotating plates 13, 20, etc. is required, and this poses a problem in that it becomes an obstacle to reducing the size and weight of the plane scanning device.

Furthermore, if one plunger solenoid were used to raise and lower the supply roller 16 and discharge roller 22 in order to reduce the number of plunger solenoids, the mechanism itself would become complicated and the entire scanning device would become larger. This creates a new problem of storage.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and eliminates the need to provide a drive device for raising and lowering the supply roller and discharge roller separately from a drive device that drives the moving platform. It is an object of the present invention to provide a plane scanning device that has a simple lifting and lowering mechanism and can be made smaller and lighter.

Structure of the Invention In the present invention, a supply roller support and a discharge roller support are each supported on a movable table so as to be able to rise and fall, and a supply roller is provided on the upper end side of the supply roller support, and a supply side elevating roller is provided on the lower end side of the supply roller support. On the other hand, a discharge roller is rotatably supported on the upper end side of the discharge roller supporter, and a discharge side elevating roller is rotatably supported on the lower end side of the discharge roller support, and a supply roller operating body is respectively provided below the moving path of the moving table. and a discharge roller actuator, and when the moving table is in a position where the object to be scanned is to be supplied, the supply side lifting roller rides on the supply roller actuator, and the supply roller support body rises together with the supply roller. The supply roller protrudes upward from the top surface of the movable table and is pressed by the supply pressure roller, while when the movable table is in a position to discharge the object to be scanned, the ejection side lifting roller The above-mentioned object can be achieved by riding on the operating body and raising the ejection roller support body together with the ejection roller, so that the ejection roller protrudes from the upper surface of the moving table and is pressed against the ejection pressure roller. It is something to do.

DESCRIPTION OF EMBODIMENTS The present invention will be described below based on embodiments shown in the drawings.

FIG. 2 is a perspective view showing a schematic configuration of a plane scanning device in a facsimile receiver according to an embodiment of the present invention, and FIGS. 3 and 4 are sectional views showing essential parts of the embodiment.

Reference numeral 25 denotes a guide shaft fixed above the bed of the main body of the apparatus (not shown), and a movable table 26 is supported on this guide shaft 25 so as to be movable along the guide shaft 25. Reference numeral 27 is also a feed screw provided above the bed in parallel with the guide shaft 25, and this feed screw 27 is adapted to be rotated by a feed screw drive device (not shown). A half nut 28 attached to the moving table 26 is screwed into the feed screw 27. Therefore, when the feed screw 27 is rotated by the feed screw drive device, the moving base 26
moves along the guide shaft 25 and the feed screw 27.

A recording head (not shown) is provided above the moving path of the moving table 26 as described above. Further, the upper surface of the moving table 26 is a flat surface,
Moreover, a large number of small holes (not shown) are provided on this upper surface. These small holes are connected to a vacuum pump (not shown).

As shown in FIGS. 3 and 4, a supply roller support 30 is supported in the vicinity of the rear end of the movable table 26 and on both sides thereof via bearings 29 so as to be able to rise and fall freely. . The supply roller support 3
0, a supply roller shaft 32 is rotatably supported via a bearing 31, and an appropriate number of supply rollers 33 are fixed to this supply roller shaft 32. On the other hand, a supply-side lifting roller 34 is rotatably supported at the lower end of the supply roller support 30.

Similarly, a discharge roller support 36 is supported in the vicinity of the front end and both sides of the movable table 26 via roller bearings 35 so as to be movable up and down. A bearing 37 is provided at the upper end of the discharge roller support 36.
A discharge roller shaft 38 is rotatably supported via the discharge roller shaft 38, and an appropriate number of discharge rollers 39 are fixed to the discharge roller shaft 38. On the other hand, a discharge side elevating roller 40 is rotatably supported at the lower end of the discharge roller support 36 .

Furthermore, a rod-shaped document stopper 42 is supported at the front end of the moving table 26 via a roller bearing 41 so as to be able to rise and fall freely, and at the lower end of this document stopper 42, a document stopper lifting roller 43 is rotated. It is freely supported (in this embodiment, the elevating rollers 34, 40, and 43 are each constituted by a ball bearing).

A supply roller actuator 44, a document stopper actuator 45, and a discharge roller actuator 46 are each fixed on the bed, and the movable table 26 is positioned at a position where the recording medium 24 is fed (as shown in FIG. 3). (hereinafter referred to as the recording medium supply position), the supply side elevating roller 34 and document stopper elevating roller 43 are respectively
4. As a result of riding on the upper surface of the document stopper operating body 45 and pushing up the supply roller support 30 and the document stopper 42, the supply roller 33 and the document stopper 42 respectively protrude slightly above the upper surface of the moving table 26. It's getting old.

On the other hand, when the movable table 26 is at the position where the recording medium 24 is discharged (the position shown in FIG. 4, hereinafter referred to as the recording medium discharge position), the discharge side elevating roller is mounted on the upper surface of the discharge roller operating body 46. 40 rides on it, the ejection roller support 36 is pushed up, and the ejection roller 39 protrudes slightly above the upper surface of the movable table 26.

Incidentally, at the front ends of the supply roller actuating body 44 and the document stopper actuating body 45, lifting rollers 34 and 43 can smoothly ride on the upper surfaces of the actuating bodies 44 and 45, respectively, in the process of returning to the recording medium supply position. Slopes 47 and 48 are provided to allow this. Similarly, the discharge roller operating body 46
A slope 49 is provided at the rear end so that the lifting roller 40 can smoothly ride on the upper surface of the operating body 46 during the process of the moving table 26 reaching the recording medium ejection position.

The head has a bracket 50, as shown in FIG. 2, near the recording medium supply position.
51 are fixed, and these brackets 5
0 and 51, a conveyance roller shaft 52 and a conveyance pressure roller shaft 53 are rotatably supported, respectively. A conveying roller 54 is fixed to the conveying roller shaft 52, and a conveying pressure roller 55, which is pressed by the conveying roller 54, is fixed to the conveying pressure roller shaft 53. A gear 56 is fixed to one end of the conveyance roller shaft 52, and this gear 56 is meshed with a gear 58 fixed to the rotating shaft of a supply motor 57 attached to the bracket 51.

One end portion of a pair of supply side arms 59 is rotatably supported by the brackets 50 and 51 via support shafts 60, respectively. A supply pressure roller shaft 61 is rotatably supported at the other end of the arm 59, and a supply pressure roller 6 pressed by the supply roller 33 is attached to this shaft 61.
2 is fixed (in Fig. 2,
In order to illustrate the supply roller 33, a part of the supply pressure roller shaft 62 is omitted from the illustration).

Further, the brackets 50 and 51 are provided with stoppers 63 that prevent each arm 59 from rotating more than a predetermined amount in the counterclockwise direction in the figure.
A spring (not shown) is interposed between each arm 59 and the brackets 50, 51, and this spring moves each arm 59 counterclockwise in the figure, that is,
It is biased in the direction of contacting the stopper 63.

A pulley 64 is fixed to one end of the supply pressure roller shaft 61, while a pulley 65 is fixed to the rotating shaft of the supply side motor 57 together with the gear 58.
A belt 66 is wound around 4 and 65.

A discharge pressure roller (not shown) that is pressed by the discharge roller 39 is rotatably supported near the recording medium discharge position of the base by a structure similar to that on the supply side. is rotated by a discharge side motor (not shown).

Next, the operation will be explained.

After the previous recording medium 24 has been ejected, the moving table 26
When the roller is returned to the recording medium supply position (the position shown in FIG. 3), the supply side lifting roller 34 and the stopper lifting roller 43 ride on the upper surfaces of the supply roller operating body 44 and the document stopper operating body 45 via the slopes 47 and 48, respectively. . As a result, the supply roller 33 and document stopper 42 protrude upward from the upper surface of the moving table 26.

Therefore, in this state, the supply side motor 57 rotates the conveyance roller 54 via the gears 58, 56 and the conveyance roller shaft 52, and at the same time, the gears 58,
When the supply pressure roller 62 is rotated via the pulley 65, belt 66, pulley 64, and supply pressure roller shaft 61, the recording medium 24 is transferred between the transport roller 54 and the transport pressure roller 55, and between the supply roller 33 and the supply pressure roller shaft 62. The paper passes through the gap and is transported on the moving table 26 in the direction of arrow A. Note that at this time, the ejection side lifting roller 40 does not ride on the ejection roller operating body 46, so the ejection roller 39
It is lowered by the upper surface of 6.

Here, when supplying the recording medium 24 described above,
As described above, since the supply roller 33 protrudes upward from the top surface of the moving table 26, the recording medium 24
is transported on the movable table 26 in a state where the contact area with the movable table 26 is reduced. Therefore, the resistance to the movement of the recording medium 24 is reduced, and the recording medium 24 can be conveyed smoothly, and when the recording medium 24 is made of aluminum alloy or the like, the recording medium 24 can be conveyed more easily. It is possible to prevent the upper surfaces of the recording medium 24 and the moving table 26 from being scratched.

As described above, the recording medium 24 is transferred to the movable table 26.
As the recording medium 24 is conveyed above, the leading edge of the recording medium 24 eventually comes into contact with the document stopper 42 . Then, the conveyance of the recording medium 24 is stopped, and the vacuum pump is activated to vacuum-adsorb the recording medium 24 onto the upper surface of the movable stage 26 at that position.

Next, the feed screw 2 is driven by the feed screw drive device.
7 is rotated, the moving table 26 is moved in the direction of arrow B (the same direction as the direction of arrow A), and scanning is started. When scanning is started in this way, the supply side lifting roller 34 and the document stopper lifting roller 4
3 are removed from the supply roller actuating body 44 and the document stopper actuating body 45, respectively, so that the supply roller 33 and the document stopper 42 are lowered from the upper surface of the moving table 26.

Next, when the scanning is completed and the movable table 26 reaches the recording medium ejection position (the position shown in FIG.
The discharge roller 39 rides on the top surface of the moving table 26.
The recording medium 24 protrudes from the upper surface of the recording medium 24 and is pressed against the discharge pressure roller 67 by the force of the spring.

Therefore, in this state, the discharge side motor operates the discharge pressure roller 67 and the conveyance roller 68.
When the recording medium 24 is rotated, the ejection roller 3
9 and the discharge pressure roller shaft 67, and between the conveyance roller 68 and the conveyance pressure roller 69, and is discharged from the moving table 26 in the direction of arrow A.

At this time, as mentioned above, the document stopper 42
Since the document stopper 42 is lowered from the upper surface of the movable stage 26, the document stopper 42 does not interfere with ejection of the recording medium 24. In addition, as described above, the discharge roller 3
9 protrudes above the top surface of the movable table 26, the small holes provided on the top surface of the movable table 26 are communicated with the atmosphere, the vacuum suction force disappears, and the recording medium 24 is held against the top surface of the movable table 26. Since the contact area is small, the resistance to the movement of the recording medium 24 is reduced, the recording medium 24 can be smoothly ejected, and the conveyance of the recording medium 24 can
4 and the upper surface of the moving table 26 will not be scratched.

Note that in this embodiment, one supply side motor 57
, the conveyance roller 54 and the supply pressure roller 62
, and the one discharge side motor is also used as a drive source for both the discharge pressure roller 67 and the discharge side conveyance roller 68. It becomes possible to reduce the size and weight.

Furthermore, although the above embodiment is an example in which the present invention is applied to a plane scanning device for recording, it goes without saying that the present invention can also be applied to a plane scanning device for reading.

Effects of the Invention According to the present invention, there is no need to provide a drive device for raising and lowering the supply roller and discharge roller separately from a drive device for driving the moving table, and the mechanism for raising and lowering the supply roller and discharge roller is simplified. , an excellent effect can be obtained in that the plane scanning device can be made smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional plane scanning device, FIG. 2 is a perspective view of a plane scanning device according to an embodiment of the present invention, and FIG. 3 is a main part of the plane scanning device according to the embodiment when a recording medium is supplied. FIG. 4 is a cross-sectional view of a main part of the plane scanning device according to the embodiment at the time of ejecting a recording medium. 24... Recording medium, 25... Guide shaft, 26...
...Moving table, 27... Feed screw, 30... Supply roller support, 33... Supply roller, 34... Supply side elevating roller, 36... Discharge roller support, 39...
...Discharge roller, 40...Discharge side lifting roller, 46
...Discharge roller, 62... Supply pressure roller, 67... Discharge pressure roller.

Claims (1)

[Claims] 1. A movable base that is movable along a fixed path and has a sheet-like recording medium supplied to its upper surface; a supply roller support and a discharge roller support that are each supported on the movable base so as to be able to rise and fall; and the supply roller support. a supply roller rotatably supported on the upper end side; a supply side elevating roller rotatably supported on the lower end side of the supply roller support; and a supply roller rotatably supported on the upper end side of the discharge roller support. a discharge roller;
A discharge side elevating roller rotatably supported on the lower end side of the discharge roller support body, a supply pressure roller and a discharge pressure roller provided above the path, respectively, and a supply roller operating body provided below the path. and a discharge roller operating body, when the moving stage is at a position on the path where the object to be scanned is to be supplied, the supply side lifting roller rides on the supply roller operating body. The supply roller support rises together with the supply roller, and the supply roller protrudes upward from the upper surface of the moving table and is pressed against the supply pressure roller, while the moving table moves along the same path. When the object to be scanned is at a position to be discharged from the table, the discharge side lifting roller rides on the discharge roller operating body, the discharge roller support body rises together with the discharge roller, and the discharge roller moves as described above. A flat surface scanning device, characterized in that it projects upward from the top surface of the table and is pressed by the discharge pressure roller.