JPS606855B2 - Vacuum adsorption type sheet feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet feeding device that feeds originals, original images, transmission documents, etc. to copying machines, facsimile machines, etc. The present invention relates to a so-called "vacuum adsorption type sheet feeding device" in which the sheets are suctioned upward one by one and the sheets are automatically sent out sequentially by a rotationally driven delivery roller.

The vacuum suction type sheet feeding device sucks up and separates the sheets stacked on the sheet stacking table one by one from the topmost sheet and feeds them, so that the sheets are stacked and stacked on the sheet counterfeiting table. It has the excellent feature of being able to separate and feed sheets even if they have different sizes and rigidities (strength of movement), and has been put into practical use mainly as a sheet feeding device for facsimile machines. ing.

One of the suction-type sheet feeding devices includes a sheet stacking table and a vacuum suction plate disposed above the sheet stacking table and equipped with sheet suction holes at the bottom facing the sheet stacking table. A casing with a casing defined by A sheet feeding roller rotatably disposed within the casing and exposed to the side of the sheet board through the suction plate, and a drive device for rotationally driving the sheet feeding roller in a sheet feeding direction. There is a device.

This device uses the suction action of the fan to suck air from the sheet suction holes into the suction plate, thereby sucking up the uppermost sheet on the seat calendar table. If the sheets are tightly stacked on top of each other, the topmost sheet may float up while attracting the sheet directly below it.

Therefore, if you rotate the sheet feeding roller in this state to feed out the above-mentioned sheets, there is a risk that multiple sheets will be sent out at the same time. When it is fed with “
Not only will the sheet jam, but the transmitting and receiving functions of the device may not function properly with respect to the sheet. In addition, even if the lower sheet that floats following the floating of the uppermost sheet is not fed,
There is a risk that the falling position may deviate from the original position and result in a skewed state before being fed.Therefore, this type of device is required to reliably separate and feed the sheets.The present invention addresses the above-mentioned requirements. Therefore, it is an object of the present invention to provide an improved suction type sheet feeding device that can separate and feed sheets more reliably.

The purpose of this is to provide the above-mentioned suction-type sheet feeding device to the above-mentioned sheet layer table at a suitable position behind the position corresponding to the sheet feeding roller of a plurality of sheets that are stacked and stacked. This is achieved by providing a sheet pressing member that presses the sheet.

The present invention will be described below with reference to an illustrated embodiment. FIG. In the figure, 2 is a sheet, 27 is a sheet lighthouse, 35 is a vacuum suction plate, turtle 1 is a casing, Kamegawa fan, 36a is a suction hole drilled in the suction plate 35, 4 is a sheet feeding loft, Umbrella 1 indicates a sheet feeding roller drive device (motor input blades QQ' and a sheet pressing member. This sheet feeding device is designated by reference numeral 10.
By rotating the fan shown in , the inside of the casing 41 surrounding the sheet feeding roller 4 is also brought into a negative pressure state, and this negative pressure "thintens the air layer between the casing guntomi and the upper surface of the sheet 2" and stacks the sheets. The uppermost sheet 2 is sucked into the suction plate 35 forming the lower surface of the casing neck mechanism, and in this state, the T-sheet feed roller 4 is rotated to direct the sheet 2 toward the scanner roller 3. It will be donated. Due to the sheet feeding roller 4, the sheet 2 delivered from the stacking section is composed of a sheet separating roller indicated by the symbol turtle 2 and a friction plate turtle 3 that elastically contacts the circumferential surface of this roller 12. The sheet separating device 14 prevents multiple sheets from being fed, and only the uppermost sheet is fed further toward the processing section 1 . The sheet 2 that has passed through the sheet separation device is guided by the guide roller blades 5, passes below the auxiliary roller 5 while bypassing it, and the tip portion contacts the scanner roller 3 and a presser foot that rotates as a result of the scanner roller 3. It gets caught between it and the roller 16. sheet 2
is conveyed to the processing section i by the rotation of the scanner roller 3, and in the processing section 1, it is sequentially processed by the scanner 17 or the recording needle 181. is further transported to other processing sections.
2 is a diagram showing an example of a specific configuration when the present invention is implemented in a pneumatic sheet feeding device for a facsimile based on the schematic diagram shown in FIG. 1. FIG.

In Fig. 2, ``The code group is the processing section, 2 is the sheet, 3 is the scanner loaf, 4 is the sheet feeding loaf, 5 is the auxiliary loaf, 7 is the detour for the sheet 2, and the stove Q'ma fan''.
11 is the casing. Tatami 2 is a sheet-separated low-fu, amount 3
15 is the guide low foot, 16 is the presser foot, 17 is the scanner 18.
19 indicates the recording needle, and 19 indicates the other scanner roller.

The series of operations of each of these members is almost the same as that described in the explanation of Fig. In FIG. 2, the sheet processing unit holder is located inside the facsimile main body 20,
A pair of guide plates 2 arranged opposite to each other along the sheet path between the pair of scanner rollers 3 and 19
1, 22, and for this seat passage "from below...
It consists of a scanner 17 and a recording stylus 8, which are arranged so as to face an image reading section and a recording section. Another pair of guide plates 23 and 24 similar to the guide plates described above are arranged along the sheet path upstream from the scanner roller 3. Each of these guide plates is supported by both side walls (not shown) of the facsimile main body. Also, each of the scanner rollers 3, 9 and the presser rollers 6, 26 are in pressure contact with these rollers.
are rotatably supported between the above-mentioned both side walls, and are driven by a step motor (not shown) (which rotates sequentially by a predetermined angle by inputting a clock pulse) to rotate in steps. 2
Through-holes are formed in each of the columns 22 and 23, 24 so as to face each other, and sheet detectors S, S2, which are formed by a combination of a light-receiving element and a light-emitting element, are inserted through each of these through-holes. Sheet detection optical paths are formed respectively.

An upstream end 24a of the sheet path of the guide plate 24 is continuous with an end closer to the main body of a document guide plate 26 for guiding a facsimile transmission document (not shown) to the scanner roller 3. The seat 2 is placed as a mirror layer on the sheet layer board 27.

A pair of ears 21a (the one in front is not shown) bent downward in an L-shape on both sides of the sheet layer plate 27 is fixed to the side plates 11a of the casing 11 by means of a special clamp. As a result, it is fixed to the lower part of the first casing (above the document guide plate 26). A paper regulating portion 27a is formed by this bending portion.This paper regulating portion 27b includes:
A lug 28 is formed substantially integrally with this, and the friction plate 13 is pivotably supported on this lug 281. The hanging piece 29a and the ear piece 28 are connected to each other by three tension springs. ~ The rotation of the friction plate 13 due to this behavior is prevented by the upper surface of the friction plate 13 supporting the circumferential surface of the sheet separation roller 12.The casing 11 is formed in the shape of a barrel, and the inside thereof is The upper and lower two housings 3 are separated by the partition plate 32 parallel to the husband plate 11b located at
3 and 34 are formed.

The lower opening □ of the lower housing 34 is covered by a suction plate 35 . This suction plate 35 is bent in a step-like manner so that only the sheet feeding roller 4 is accommodated in the lower housing 34, and a portion corresponding to the sheet feeding roller 4 is provided with a sheet feeding roller. A large number of relatively large sheet suction holes 35a are bored in parallel in a comb-like shape so that the circumferential surface of the roller 4 extends from below the suction plate 35.These elongated holes 35a will be described later. It also serves as an air intake port for the fan.The sheet feeding roller 4, the auxiliary roller 5, and the sheet separating roller turtle 2 are connected to each other on individual support shafts 4a,
In contrast to 5a and 12a, it is composed of a plurality of coin-shaped lo-hoos, each mounted at a certain interval.

A one-way rotating clutch is installed between each of the support shafts 4a and 12a of the sheet feeding roller 4 and the sheet separation roller 12, and the rollers mounted on these support shafts.
(not shown) and individual.

The roller can freely rotate in the forward direction, that is, in the counterclockwise direction in the figure, with respect to each support shaft mother a and the tortoise 2a. A thrust spring (wave washer) is interposed between the support shaft 5a of the auxiliary roller 5 and each roller mounted thereon, and this auxiliary roller W prevents the occurrence of abnormal load paper movement. etc.), due to the action of a thrust spring (not shown), the support shaft 5a slips against each roller mounted on it, and no abnormal load is applied to the drive motor, which will be described later. It looks like this.

Each of the above-mentioned support shafts 4a, 5a, 12a and guide roller 1
5 are rotatably supported between the side plates 11a of the casing 11, perpendicular to the sheet feeding direction and approximately parallel to the stacked sheet surfaces. In the drawings 4a and 12a, each end on the near side has a ``Pulley 4b, 12b is connected to a spring clutch (
(not shown). Further, a pulley 5b is fixed to the end of the support shaft 5a. Each of these pulleys is connected to a drive pulley 36 rotatably supported on the casing side plate of the upper housing 33 via idler pulleys 37 and 38 that are pivotally supported in the same way as this drive pulley 36. They are connected by a belt 39. The drive pulley 36 is integrally formed with a worm wheel 40, and the worm wheel 40 is driven by a worm 42 fixed to a drive shaft of a feed motor 41.

The feed motor 41 is fixed on the partition plate 32 inside the upper housing 33. A fan IQ having rotating blades arranged around the motor is fixed on the partition plate 32 of the upper housing 33, and as this fan 10 rotates, the air inside the lower housing 34 is
It is discharged outside the housing through the entrance 32a of the rice sorting plate 32 between the upper housing and the mesh opening lc provided at the upper part of the casing 31, and the inside of the lower housing is brought into a negative pressure state. A sheet feed roller clutch solenoid 3 and a sheet separation roller clutch solenoid 44 are fixed to the inner wall of the upper housing 33, respectively. ``The arms of the two arms 46 and Tsuru 6 are also engaged with each other.The other arm end of each of the two arms Murakametomi and Kametsuru is bent into an L-shape.'' Even if these bent portions are engaged with the claws of each of the four toothed ratchet wheels 8, which are fixed to the support shaft 4a and the tortoise a, respectively,
Ru. By pressing the start button (not shown), the fan operates and puts the lower housing 3 into a negative pressure state. Suction.The operation of the fan Q is stopped when the leading edge of the sheet 2 blocks the sheet detection optical path of the sheet detector S, and receives a signal from the sheet detector S. The drive motor starts operating at approximately the same timing as the fan motor 8, and each pulley is removed via the timing belt 39.
Rotate each army 2b. Each f. Only the auxiliary roller 5 rotates with the rotation of -IJ-. Fujido Motor
The operation of the Crane Turtle briefly stops after the rear end of the sheet cloud receives a signal that opens the sheet detection optical path of the sheet detector S2. Even if it works, after a few sands, it is ``excited ~ each arm Muratsuru 5,
The end of each arm of the turtle stripes is each claw wheel turtle y? The rotation of each pulley 4b and 2b is transmitted to each support shaft 4ag via a spring clutch.
The sheet feeding roller 4 and the sheet separating roller group 2 each rotate. The excitation for the solenoid 3 is caused by a signal that causes the tip of the sheet 2 to cut off the optical path of the sheet detector S. As a result, the rotation of the sheet feeding roller and the sheet separating roller are sequentially stopped.
For the above-mentioned vacuum suction type sheet feeding device, code QQ
It is equipped with a sheet presser material shown in .

In FIG. 2, the sheet presser Tsumura Tomi 00 also connects the base force Q force a of Umemurakame Q force formed in a U-shape to the hanging piece at the rear (left side in FIG. 2) end of the suction plate 36. 85M is attached to the pole in a swingable manner by pin Q2, and its free end Q1b is also glued with Korotomi Q3, and due to its own weight, "Koro IQ3
The cylindrical surface is straight.

Note that there is also an L-shaped tongue piece 3 on the side of the hanging piece 35b.
5c has been formed, and ``Place the sheet 2 on the sheet war calendar table 27''.
In FIG. 2, even when the upper part of the seat calendar table 27 is exposed when it is rotated to the right, and even when the arm shogun's color is engaged with the tongue piece 35c, the seat presser member ``gun unagitsuru'' is ``closed to the suction plate 85''. As a result, when the casing Guntomi is returned to its original position (the position shown in Figure 2), the Korokame Crab 3 smoothly contacts the upper surface of the sheet 2, and Blind movement and damage to the sheet presser member QRO are prevented.By the way, according to the suction type sheet feeding device of the present invention having the sheet presser member described above, the rotation of the fan causes the amount of casing in the container to increase. When the topmost sheet of the stacked sheets 2 rises to the negative pressure state, its abdomen is also pressed by the sheet holding member dragon fin 8, so the ``strength of the waist of the sheet'' is reduced. Since this acts as a drag against the levitation, the topmost sheet levitates, but the sheets above it float due to the above-mentioned drag.
In addition, if the sheet is weak and follows the upper sheet and floats up, the fan-pupil stops and the sheet that follows it and floats down falls, and the sheet holding member electric fin feeds. The pressing force has the effect of causing the sheet to fall back to its original position without causing any skewing.In contrast to the above-mentioned Coro official report, Umemura Kame Q Fuki, the sheet is rotatably supported. may also be fixed.

Further, the pressing force of the Coroden 3 on the sheet 2 may be due to the relatively weak elasticity of a spring instead of its own weight. Again, a thin rubber plate may be used in place of the above-mentioned Isomura. It is possible to prevent air from flowing into the cassisog GI from the left side in FIG.

The seat holding member IQO has the advantage of being located at a suitable location on the casing 11 so that it does not prevent damage when loading the sheet, but it is not possible to place the sheet holding member IQO on the seat lighthouse. , the stated objectives of the invention are achieved.

Although not directly related to this invention, if the sheet pressing member is made of a conductive material, and the sheet pressing member and the separating action of the sheet tray are used as a mechanical switch. , it is possible to add a sheet presence/absence detection function very easily.Also, it is possible to add a sheet presence/absence detection function very easily.Also, it is possible to add a sheet presence/absence detection function to the sheet press part (rollers 1 and 3) of the sheet holding member at the location of the sheet copy stand, through which this press part passes through. It is also easy to detect the presence or absence of a sheet by mechanically or electrically detecting the state in which the above-mentioned pressing portion is located below the sheet teaching table through this hole.

In addition, as a countermeasure against skewed sheets and paper jams, it is recommended to install a mechanical switch or a photoelectric switch at an appropriate location at the tip of the sheet layer base and at an appropriate location on the side of the sheet layer base. The object of the present invention can be more effectively achieved by detecting whether the stacking state of the sheets is normal or not by using a combination of these switches.
In the above-mentioned embodiment, the circumferential surface of the L sheet feeding roller constitutes the sheet conveying section; however, the conveying section may be a belt-like member that is stretched around the sheet feeding roller.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the principle of an embodiment in which the present invention is applied to a facsimile, and FIG. 2 is a schematic diagram of the above embodiment. 2...Sheet, 4...Sheet feeding low-fu, 10...
...Fuaso, 11...Casing, 27...Sheet layer stand, 35...Vacuum suction plate, 35a...Suction hole, 41...Drive device, io0...Sheet pressing member. Box diagram Figure 2

Claims (1)

[Claims] 1. A sheet loading table, a casing defined above the sheet loading table and having a suction plate with sheet suction holes on the bottom facing the sheet loading table, and A fan that selectively creates a negative pressure state in the space between the suction plate and the sheet loading table by suction, and a fan that exposes a part of the sheet conveying section to the sheet loading table through the suction plate and inside the casing. a sheet feeding roller rotatably disposed on the sheet feeding roller; a drive device that rotationally drives the sheet feeding roller in the sheet feeding direction; and a driving device that rotates the sheet feeding roller in the sheet feeding direction; A vacuum suction type sheet feeding device comprising a sheet pressing member that presses a suitable position behind a position corresponding to a sheet feeding roller.