JPH06298396A - Paper sheet conveying device - Google Patents

Abstract

PURPOSE:To provide a paper sheet conveying device capable of shortening and thinning the shaft of a conveyance roller, reducing the cost, and lightening the device. CONSTITUTION:Roller support pieces 32 are provided on the upper face of a top frame 2, driving and driven conveyance rollers 24, 29 are supported between the roller support pieces 32, and shafts 24a, 29a of both conveyance rollers 24, 29 are connected by a timing belt 44. It is unnecessary to extend the shafts 24a, 29a of the conveyance rollers 24, 29 to the whole width or above of a paper sheet conveyance passage 21 to be supported on a support frame. The shafts 24a, 29a can be sharply shortened, the bending moment applied to the shafts 24a, 29a is reduced, the contact pressure between both conveyance rollers 24, 29 can be secured, and a document can be surely conveyed. The shafts 24a, 29a can be thinned and shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transporting device for transporting a document to a reading mechanism for reading image data in a facsimile machine.

[0002]

2. Description of the Related Art Generally, a facsimile apparatus is provided with a plurality of conveying rollers for smoothly conveying a document. Each of the transport rollers is composed of a pair of rollers that are in contact with each other so as to sandwich the document transport path through which the document passes. Each conveyance roller is formed shorter than the width of the document conveyance passage, and is rotatably supported at the center in the width direction of the document conveyance passage. One of the transport rollers is a drive roller that is connected to the motor via a gear. The other roller is a driven roller that comes into contact with the outer peripheral surface of the drive roller and is driven to rotate.

Gears are attached to the ends of the shafts projecting from one end of each of the drive rollers. This gear is connected to a drive mechanism including a motor and a plurality of gears. This drive mechanism is provided on the side of the apparatus case so as not to interfere with the document conveyance path.

[0004]

Therefore, the axis of each conveying roller is longer than the lateral width of the conveying passage. When the shaft is long, the bending moment acting on the shaft becomes large, so that the contact pressure between the transport roller and the driven roller in contact with the transport roller cannot be secured, and the paper sandwiching pressure is low. Therefore, there is a possibility that the paper cannot be conveyed normally. For this reason, conventionally, it is necessary to make the shaft diameter of the conveying roller large, and the bearing and the like also increase accordingly, which causes a problem in terms of cost such as material cost and the facsimile device becomes heavy.

The present invention has been made to solve the above-mentioned problems, and its purpose is to shorten the axis of the conveying roller,
Another object of the present invention is to provide a sheet conveying device which is thin and can reduce the cost and the weight of the device.

[0006]

In order to achieve the above object, in the present invention, a subframe is provided in a mainframe provided with a mechanism for processing image data, and a sheet is provided between the mainframe and the subframe. A conveying path is formed, a plurality of conveying rollers are supported on the sub-frame along the sheet conveying direction, a drive mechanism is connected to the shaft of one conveying roller, and the shafts of the conveying rollers are connected by a power transmission mechanism. What is done is summarized.

[0007]

Since the plurality of conveying rollers are supported by the subframe which is not provided with a mechanism for processing image data, even if the conveying rollers are connected by the power transmitting mechanism on the subframe, the power transmitting mechanism is Does not interfere with the mechanism for processing image data. As a result, it is not necessary to extend the shaft of each transport roller to the drive mechanism.

When the driving mechanism is connected, its power is transmitted to one conveying roller. Further, the power is transmitted to all the transport rollers via the power transmission mechanism. As a result, the sheet is conveyed to a mechanism provided on the main frame for processing image data, for example, a reading mechanism, and the image data on the sheet is read.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a facsimile machine will be described below with reference to the drawings.

As shown in FIG. 1, a metal top frame 2 as a sub frame is supported on a main frame 1 made of synthetic resin so as to be opened and closed by a shaft (not shown). A cover 3 made of synthetic resin is attached to the upper surface of the top frame 2. Therefore, the cover 3 and the top frame 2 are integrally opened and closed with respect to the main frame 1. On the upper surface of the cover 3, a document tray section 3a on which a document (not shown) is placed, an operation panel 3b in which various operation keys and switches are arranged, and the like are provided. A thermal head 4 is attached to the rear rear surface of the top frame 2. Further, a roll paper accommodation portion 5 for accommodating the heat-sensitive roll paper P is formed in a substantially central portion of the main frame 1. A platen roller 6 facing the thermal head 4 is positively rotatably supported on the rear portion of the main frame 1.

A cutter 8 is fixed via a paper guide 7 on the main frame 1 on the downstream side of the platen roller 6. Main frame 1 and cover 3
A discharge port 1a for discharging the recording paper is formed in the rear part of the above. A recording paper discharge tray 9 on which the thermosensitive roll paper P cut by the cutter 8 is placed is detachably mounted on the main frame 1 on the downstream side of the cutter 8. At the front part of the main frame 1, there is rotatably supported a take-in roller 11 for taking in the document G placed on the document tray portion 3a between the main frame 1 and the top frame 2. The separation pad 12 is in contact with the outer peripheral surface of the feeding roller 11 by a leaf spring 13.

As shown in FIG. 2, a gear 11b is fixed to the shaft 11a of the take-in roller 11, and the gear 11b is supported by the motor bracket 14 such that gears 15, 16 and
17 and a motor 18 on the output shaft of the motor 19 are connected to the motor 19 on the motor bracket 14.

As shown in FIGS. 1 and 2, a sheet conveying path 2 through which a document G passes between the main frame 1 and the top frame 2 in front of the feeding roller 11.
1 is configured. The sheet conveying path 21 is bent on the way, and a drive conveying roller 24 is arranged in the vicinity of the bending. A driven roller 25, which is driven to rotate with the driving and conveying roller 24, is in contact with the driving and conveying roller 24. The shaft 24 a of the drive / conveyance roller 24 is supported on the upper surface of the top frame 2. The shaft 25a of the driven roller 25 is supported by the leaf spring 26 on the back surface of the main frame 1 while being constantly urged toward the driving and conveying roller 24. A gear 41 is fixed to the shaft 24a of the drive conveyance roller 24, and the gear 41 is connected to the motor 19 via the gear group 16 and the like. A drive mechanism is formed by the motor 19, the gear group 16 and the like.

A document discharge port 27 is formed between the front portion of the main frame 1 and the front portion of the cover 3. A driven conveyance roller 29 is arranged on the sheet conveyance path 21 between the document discharge port 27 and the drive conveyance roller 24. A driven roller 30 that is driven to rotate is in contact with the driven conveyance roller 29. The shaft 29 a of the driven conveyance roller 29 is supported on the upper surface of the top frame 2. The shaft 30a of the driven roller 30 is supported on the back surface of the main frame 1 by a leaf spring 31 while being constantly urged toward the driven conveyance roller 29.

Next, the supporting structure of the driving and conveying rollers 24 and the driven and conveying rollers 29 will be described in detail. 3 to 5
As shown in FIG. 3, a pair of left and right roller support pieces 32 are integrally formed on the front portion and the rear portion of the top frame 2, respectively. The roller support piece 32 at the front of the upper surface is arranged at the center in the width direction of the sheet conveying passage 21, the roller support piece 32 at the rear of the upper surface is arranged at one side at the center and the other side at the width end of the sheet conveying path 21. Each of the roller support pieces 32 is formed with a bearing accommodating groove 34 whose upper edge is open. Reference numeral 34a indicates the open portion, which is narrower than the diameter of the accommodation groove 34. Notches 36 are formed on the end faces of the roller support pieces 32, respectively.

A bearing 37 made of a flexible synthetic resin attached to the shafts 24a, 29a of the two conveying rollers 24, 29 is detachably engaged with the bearing receiving groove 34 of each roller support piece 32. The drive and driven conveyance rollers 24 and 29 are located in the widthwise center of the sheet conveyance path 21. In addition,
The shaft 24a of the drive / conveyance roller 24 is slightly extended so as to be supported by the roller support piece 32 located at the width end of the sheet conveyance path 21, and the gear 41 is provided at the extension end thereof.

Each bearing 37 is formed to have a diameter substantially the same as that of the bearing accommodating groove 34, and a parallel cut surface 38 is formed opposite to each bearing 37. Cut surface 38
The thickness between them is almost the same as that of the open portion 34a. A sheet-shaped knob 39 is integrally formed with each bearing 37. A protrusion 40 is integrally formed on one side surface of the knob 39. The protrusions 40 correspond to the roller support pieces 3 described above.
It engages with the two notches 36 and regulates the rotation of the bearing 37 with respect to the roller support piece 32.

On the opposite side of the gear 41, toothed pulleys 42 and 43 having small diameters are fixed to the shafts 24a and 29a of the two conveying rollers 24 and 29, respectively. A timing belt 44 is mounted between the toothed pulleys 42 and 43. The toothed pulleys 42 and 43 are the conveying rollers 2
Timing belt 4 has a smaller diameter than 4,29.
The width between the upper and lower running portions of 4 is narrower than the diameter of the transport rollers 24 and 29, so that the timing belt 44 does not come into contact with the top frame 2. Therefore, the motor 1
The rotation of 9 causes the drive conveyance roller 2 to pass through the gear 41.
4 rotates, and at the same time, the driven conveyance roller 29 rotates via the timing belt 44.

As shown in FIG. 1, the main frame 1
A document reading unit 45 for reading the image information of the document G is supported as a mechanism for processing image data on the front rear surface side of the. The document reading unit 45 includes a frame 46, a light source (LED) 47, a plurality of mirrors 48, a lens 49, and an image sensor 51. The light source 47 irradiates the original G that has passed through the reading window 20 formed between the driving and conveying rollers 24 and the driven and conveying rollers 29 with light. The light (reflected light) applied to the document G passes through the reading window 20 again, and finally is applied to the image sensor 51 via the plurality of mirrors 48 and the lenses 49.

Therefore, when the reading operation is started in a state where a plurality of originals G are stacked and supported on the original tray portion 3a, the feeding roller 11, the driving conveyance roller 24 and the driven conveyance roller are driven by the driving of the motor 19. 29 is rotated. Then, a retraction force is applied to the one original G that is in contact with the retraction roller 11, and the original G is fed into the original conveyance path 21. At this time, the other originals G are held by the separation pad 12 on the original tray portion 3a, while being prevented from being fed into the original conveyance path 21. That is, as the take-in roller 11 rotates, the take-up roller 11 and the separation pad 12 cooperate with each other to separate the originals G on the original tray portion 3 a one by one and take them into the original conveying passage 21.

The document G fed into the document transport passage 21
Is further conveyed to the reading window 20 by the retraction force of the retraction roller 11 and the rotational force of the drive conveyance roller 24. Then, the image data of the document G is transferred to the image sensor 5.
1, the original G is read by the driven conveyance roller 29.
It is discharged from the document discharge port 27 by the rotating force of.

By the way, according to this embodiment, the roller supporting piece 32 is provided on the upper surface of the top frame 2, and the driving and driven conveying rollers 24 and 29 are supported between the roller supporting pieces 32. Then, the shafts 24a, 2 of both the transport rollers 24, 29
The timing belts 44 connected between 9a. As a result, it is not necessary to extend the shafts 24a, 29a of the transport rollers 24, 29 over the entire width of the paper transport passage 21 and support them on the support frame.

Therefore, the length of the shaft 29a of the driven conveyance roller 29 is slightly longer than that of the driven conveyance roller 29. Further, the shaft 24a of the drive / conveyance roller 24 is longer than the shaft 29a of the driven / conveyance roller 29 because one end side thereof is extended, but the total length is almost half of the conventional shaft.
As a result, the shafts 24a and 29a can be significantly shortened as compared with the conventional one. Therefore, the bending moment applied to the shaft is reduced, and both the transport rollers 24 and 29 and the driven roller 2 are
It is possible to secure a contact pressure between the contact holes 5 and 30 and reliably transport the document. That is, according to this embodiment, the shaft 2
4a and 29a can be made short and thin, and the material cost of the shafts 24a and 29a can be reduced and the weight of the device can be reduced.

The present invention is not limited to the above embodiment, but may be configured as follows, for example, within the scope of the invention. (1) In the above embodiment, the power transmission mechanism between the shafts is composed of the toothed pulleys 42 and 43 and the timing belt 44, but may be composed of gears or the like.

(2) In the above embodiment, the drive / conveyance roller 2 is used.
However, the present invention may be embodied in a sheet conveying device having three or more conveying rollers.

(3) In the above embodiment, the toothed pulleys 42 and 43 are provided on the shafts 24a and 29a on the opposite side of the gear 41 via the rollers 24 and 29, but on the gear 41 side, the pulleys 42 and 43 are provided on the shafts 24a and 29a. A toothed pulley may be provided.
With this configuration, the shafts 24a and 29a can be made even shorter.

(4) A mechanism for processing image data is
The present invention may be embodied in a mechanism different from that of the above-described embodiment, for example, a paper transporting device that transports the recording paper to the side of a printing device (printing head) that prints on the recording paper.

[0028]

As described in detail above, according to the present invention,
Since the shaft of the drive roller can be made short and thin, the material cost and the like can be reduced, and the cost and weight of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a facsimile apparatus showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a facsimile device showing a gear connection state.

FIG. 3 is a partial perspective view of a top frame.

FIG. 4 is a front view illustrating an operation when a bearing is engaged with a roller support piece formed on the top frame.

FIG. 5 is a front view showing a state where a bearing is engaged with a roller support piece formed on the top frame.

[Explanation of symbols]

Reference numeral 21 denotes a document conveying passage as a paper conveying passage, 24 is a driving conveying roller, 24a is a driving conveying roller shaft, 29 is a driven conveying roller, and 29a is a driven conveying roller shaft, and 42 and 43.
... a toothed pulley that constitutes a power transmission mechanism, 44 ... a timing belt that constitutes a power transmission mechanism, 15, 16, 17,
18, 41 ... Gears constituting a drive mechanism, 19 ... Motors.

Claims (1)

[Claims] 1. A subframe is provided in a mainframe provided with a mechanism relating to processing of image data, a paper carrying path is formed between the mainframe and the subframe, and a plurality of carrying rollers are provided in the subframe. A paper conveyance device that is supported along the paper conveyance direction, has a drive mechanism connected to the shaft of one conveyance roller, and has a power transmission mechanism connected between the shafts of the conveyance rollers.