JPS58100046A - Paper feed device - Google Patents

Abstract

PURPOSE:To make it possible to surely set a sheet in a registration position, by providing such an arrangement that the operation a paper feed device is interrupted by disengaging a drive transmitting relation when a sheet detecting sensor detects the leading end of a sheet, and thereafter the sheet is fed to a pair of registration rollers by engaging the drive transmitting relation. CONSTITUTION:Sheets are transmitted in the direction of paper feeding by means of the friction and rotation of a paper feed roller 16, and then, the upmost sheet alone is transmitted by separation rollers 25, 26 so that the leading end of the sheet reaches a detecting sensor 51 which issues a signal. Due to this signal an electromagnetic spring clutch 33 is disengaged for interrupting the transmission of the sheet. Further, the electromagnetic clutch 33 is engaged after the lapse of a predetermined time period so that the separation roller 25 is rotated together with the paper roller feed 16 for transmitting the sheet to carrying rollers 36, 37 which are rotated always. The sheet is further carried upward so that the sheet is bit between a pair of registration rolles 56 with the use of sheet feed force and the nerve of the sheet itself. Further, a suitable deflected amount is given thereto for rotating a pair of registration rollers 56. Thus, the feed of the sheet is interrupted, thereby the registration position of the sheet may be surely set.

Description

[Detailed description of the invention] The present invention relates to a paper feeding device such as a copying machine.

In a paper feeding device such as a copying machine, a stack of sheets such as transfer paper is placed on a sheet stack placement plate, and the paper feeding roller is placed in contact with the leading edge of the uppermost sort of the sheet stack. A paper feeding device is known that rotates in the sheet feeding direction and feeds sheets one by one to a transfer unit or the like by the frictional force generated between the roller and the roller.

As such a paper feeding device, for example, there is a method using corner separating claws, but this method utilizes the elastic flip-up action of both corners of the leading edge of the sheet, and is generally used. This is an example of a paper feeding device.

In contrast, a paper feeding device that does not use corner separation claws has been proposed. This paper feeding device is provided with a pair of separation rollers instead of corner separation claws, which are provided independently with respect to the traveling direction of the sheet fed by the paper feeding roller, and are provided with a pair of separation rollers in place of the corner separation claws. is driven to rotate in the sheet feeding direction, while the lower separation roller is configured to be unable to rotate.

Now, suppose that multiple sheets are inadvertently fed simultaneously from the paper feed roller to a pair of separation rollers that are in contact with each other, and when multiple sheets of notebook paper collide between the upper and lower separation rollers, the lower Since the separating roller is stopped, the progress of the sheets after the next note to the top 7th sheet is obstructed, and only the topmost sheet is conveyed by the sheet conveying force of the upper separating roller. become. The sorted sheets separated into one sheet in this manner are sent to a destination feeding section, for example, a transfer section of a copying machine, via a pair of registration rollers.

In this way, one sheet is separated between a pair of separation rollers, and compared to a system using a corner separation claw, such a separation device has a smaller separation distance from the paper feed section. This is provided because sheet separation at the top cannot be reliably guaranteed.

Conventionally, such paper feeding apparatuses in which a separating device is provided after the paper feeding section have had the following problems.

The sheets fed by the paper feed roller can be divided into two types: those in which only one sheet is normally separated and fed from the paper feeding section, and those in which a plurality of sheets are fed simultaneously. In the latter case, among the multiple sheets that have reached the separation roller, the next sheet is fed an additional distance from the paper feed section to the separation roller compared to the top sheet. This causes the following problems.

In the conventional device, the sheet fed from the separation roller is continuously fed until the leading edge reaches the pair of registration rollers, and the ski-feed correction, etc. is performed at the pair of registration rollers. In order to achieve this, a slight slack is provided between the pair of separation rollers and registration rollers.

However, in the latter case, the next sheet is fed the extra distance, so if the next sheet is fed directly from the separation roller after the topmost sheet has passed, the registration will be This will cause the sheet to slacken excessively between the pair of rollers. If this amount of slack becomes larger than necessary, the thrust of the sheet to the pair of registration rollers will be reduced, causing the registration position to be erroneous, or skewed feeding to be corrected incorrectly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that eliminates the above-mentioned drawbacks.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows a sheet feeding device according to an embodiment of the present invention, in which a sheet stack placement plate designated by reference numeral 1 is used to place a 7-ton stack, and is stored in a sheet feeding casing 2. , can be raised and lowered freely.

During paper feeding, the paper feed roller 16 is in contact with the leading edge of the uppermost notebook of the sheet stack placed on the sheet stack placement plate 1;
By rotating in the sheet feeding direction (arrow direction), the same sheet is fed in the feeding direction by the frictional force between the sheet and the sheet. As shown in FIG. 2, the support member 17 has its base end aligned with the axis i
A paper feed roller 16 is attached to a shaft 19 which is supported so as to be swingable and which is horizontally suspended by a support member 17 via a one-way rotation clutch 21 . Note that the paper feed roller 16 is
Gear 22 fixed to shaft 18Vζ. It is rotationally driven by a transmission system consisting of an eye gear 23, a gear 24 fixed to the shaft 19, and the like.

As shown in FIG. 2, the paper feed roller 16, together with the supporting member 17, etc., is arranged at two locations at a predetermined interval in a plane area.
It is located. The upper separation roller 25 is disposed on the lower side of the paper feed roller 16 in the sort feeding direction, rotates in the feeding direction, and has a shaft 1.
8, between both support members 17, 47 via a one-way rotation clutch 27.

In FIG. 1, the lower separation row 226 constitutes an example of a contacting member that contacts the upper separation roller 25, and is paired with the upper separation roller 25.
It is attached via a one-way rotation clutch 29. Due to this one-way rotation clutch 290 function, the lower separation roller 26 maintains a stopped state while the upper separation roller 25 rotates in the sheet feeding direction, and the sorting is carried out from the paper feed roller 16 by a plurality of sheets. When the uppermost sheet is separated, it cooperates with the upper separation roller (9) to separate and convey only the uppermost sheet.

1 and 2, an electromagnetic spring clutch 35 with an input drive gear 32 is provided at the end of the shaft 18. As shown in FIGS. The input drive gear 2 is rotationally driven by the drive motor 20 via an appropriate transmission system, and the drive motor 2o and the input drive gear 32 rotate each roller system such as the paper feeding roller and separation roller. A driving source for driving is configured.

On the other hand, the electromagnetic pull clutch 33 constitutes an example of a clutch means for disconnecting the drive transmission relationship from the drive source to the roller system and rotating and stopping the roller system, respectively.

A pair of conveyance rollers 56 and 37 are arranged downstream of both separation days 25 and 2'.
8 and shafts 41, 42 supported on both side plates 38, 39°
are fixed respectively.

Of the pair of conveyance rollers, the right conveyance roller 36 is a drive-side roller, and can be rotated by an input drive gear 62, an idle gear 43, and a gear 44 provided on the shaft 41. On the other hand, the left conveyance roller 37 is configured to rotate as a result of the rotation of the drive-side roller 36.

Note that gears 32 and 44 are mounted on the shafts of the separation roller 25 and the conveyance roller 36, respectively.
・In order to avoid clutter in the drawings, for convenience, they shall be represented by the same line.

In the sort feeding direction, a pair of conveying rollers 3<S,
A pair of registration rollers 56 consisting of rollers 57 and 58 in contact with each other is disposed downstream of the roller 37, and this pair of registration rollers 56 is sent from both separation rollers 25 and 26 via conveyance rollers 36 and 37. Feed the sheet while holding it in your mouth,
The timing for starting the rotation is determined so that the leading end of the sort reaches the target feeding section, for example, the transfer section 59 of a copying machine, at an opportune time.

In FIG. 1, on the sheet feeding path between the separation rollers 25 and 26 and the pair of registration rollers 56 (for example, as shown in the figure, at a position close to the former separation roller,
A note detection sensor 51 is provided, and this sheet detection sensor detects the leading edge of the sheet advancing from the separation roller.

At this point, in FIGS. 1 and 2, when the print button (not shown) of the copier is pressed, the drive motor 20
is started, the input drive gear 32 begins to rotate, and the electromagnetic spring clutch 33 is turned on.

When the input drive gear 32 starts rotating, this rotation is caused by the idle gear 43. The rotation is transmitted to the conveying roller 36 via the gear 44, and the roller 36 rotates in the direction of the arrow, and following this rotation, the other roller 67 rotates in the direction of the arrow.

Kazuyoshi, by turning on the electromagnetic pull clutch 36,
The rotation of the input drive gear 32 is transmitted to the shaft 18, and the rotation of the input drive gear 32 is transmitted to the shaft 18.
8 rotates, the upper separation roller 25 rotates in the direction of the arrow via the one-way rotation clutch 27. The one-way rotation clutch 27 is attached to the shaft 18 so that when the shaft 18' rotates clockwise, the rotation is transmitted to the low shear 25.

Further, the rotation of the shaft 18 causes the shaft 19 to rotate via the gear 22, the idle gear 23, the gear 24, etc., and this rotation is transmitted to the paper feed roller 16 via the one-way rotation clutch 21. Rotate in the direction of the arrow. In addition,
The one-way rotation clutch 21 is configured to rotate the shaft 19 so that when the shaft 19 rotates clockwise, the rotation is transmitted to the roller 16.
installed on.

Here, the one-way rotation clutch 29 on the lower separation roller 26 side is attached to the shaft 28 so as to transmit the rotation to the roller 26 when the shaft 28 rotates clockwise, and therefore, the one-way rotation clutch 29 on the lower separation roller 26 side While the separation row 225 rotates in the direction of the arrow, the separation roller 26 that is in pressure contact with the separation row 225 is held in a stopped state.

That is, the separation roller 25 attempts to rotate the separation roller 26 counterclockwise due to frictional force, but the function of the one-way rotation clutch 29 prevents the separation roller 26 from rotating counterclockwise. ing.

Therefore, the upper separation roller 25 and the lower separation roller 26
pcχ, 1, it will slip and rotate.

Returning to the original explanation, when the paper feed roller 16 rotates in the direction of the arrow, the topmost sheet or a plurality of sheets including the topmost sheet are fed by the frictional force between the roller 16 and the sheet. sent in the direction.

Now, suppose that multiple sheets of sorted notebooks have been sent from the paper feed roller section, and the tips of these multiple notebooks are
5 and 26, and the next sheet and subsequent sheets are stopped by this roller section, specifically, the lower separation roller section, whereas only the uppermost sheet is stopped by the upper separation roller 25. Be sent by the conveying force. When the leading edge of the sort reaches the note detecting sensor 51, the sheet detecting sensor 51 detects the leading edge of the sheet, and this detection signal causes the electromagnetic spring clutch 3, which has been in the ON state, to
3 is turned off, and as a result, the drive transmission relationship from the input drive gear 32 to the shaft 18 is cut off, and sorting is temporarily stopped.

In this state, the leading edge of the sheet should be placed at a location corresponding to the sensor 51.

Next, after a predetermined time has passed since the sheet stopped, when the predetermined paper feeding time is reached, the electromagnetic switch: ring clutch 3 is activated.
3 is turned on again, and as a result, the above-mentioned drive transmission relationship is linked, and the separation roller 25 is connected to the paper feed roller 21.
A conveyance roller 5 rotates together with 6 and constantly rotates for sorting.
6 and 37, and is held between the same rollers. - After the sheet is securely caught between the rollers, the electromagnetic spring clutch 33 is turned off, and the sheet is now conveyed upward only by the conveyance rollers 56 and 57.

In FIG. 1, the leading edge of the sheet S conveyed upward touches both rollers 57° 581f of the pair of registration rollers 56.
fi K, note feeding force, stiffness of the sheet itself, and <C
Therefore, the pair of registration rollers 56 immediately begins to rotate after it has been bitten in and an appropriate amount of slack has been created at the 7-tooth. This rotation is started when the leading edge of the visible image formed on the photosensitive drum 6 rotating in the direction of the arrow reaches the transfer section 59, and the leading edge of the sheet S meets the leading edge of the visible image at an opportunity a'. It is determined that In this way, the pair of registration rollers 56 performs so-called registration adjustment of the sheet. After the above meeting, the visible image is transferred by the transfer charger 4 to the sheet moving while in contact with the photosensitive drum B.

Note that when the sheet detection sensor 51 detects the passing of the sheet l end, this detection signal turns on the electromagnetic spring clutch 33 again, and the paper feed roller 16 and separation roller 25 start rotating, and the next sheet is removed. K is set so that the feeding is performed. In this case, the next sheet will be fed from the paper feed roller 16 if multiple sheet feeding has not occurred before, and from the separation roller 25 if multiple sheet feeding has occurred previously. , 26, and when the sheet is sorted in two ways, in any case, when the leading edge of the sheet is detected by the detection sensor 51K, the clutch 33 is turned off as described above. However, once it stops at the detection sensor, the operation described above can be repeated.

Here, as mentioned earlier, between the conveyance roller 36°67 and the registration roller pair 56, or when the conveyance roller is not provided, the separation rollers 25, 26 and the registration roller pair 56
In other words, when the sheet is fed from the pair of registration rollers 56 toward the transfer section 59, the sheet is This has the effect of automatically controlling the skew feed, and also prevents the sorting edge from occurring due to an error in the start-up time when the electromagnetic spring clutch is disengaged quickly, or a slight slip between the sheet and the roller system. This has the effect of absorbing positional errors in the pair of registration rollers.

Now, in FIG. 1, in a state where a plurality of sheets have been fed from the paper feed roller 16, only the uppermost sheet is separated and fed by the separation roller 25, and then the next-order seed If the next sheet is fed from the separation roller part, the next sheet will be at the tip of the sort when it is on the sheet stack stack plate 1, compared to the normal paper feed form @VC.
This means that the distance between the separation roller 26 and the separation roller 26 is increased. The thrust of the sheet tip to the roller pair decreases,
The registration position may become incorrect, or the skew feed may not be corrected correctly. In other words, if the seat is loosened more than necessary, the back strength of the seat itself cannot be utilized.

Conventionally, seven sheets were continuously fed from the separation roller section, which caused the problems described above, but in the embodiment of the present invention, multiple sheets are fed or regular Regardless of single-sheet feeding, all sheets that come out of the separation rollers are temporarily stopped at the sheet detection sensor 51, and then, after a predetermined period of time, the sheets are restarted at the same time in either case. Since the skis are fed, it is ensured that the aforementioned slack is always set to an appropriate amount, that the registration position is correctly determined, and that the ski is corrected.

In addition, in FIG. 1, the intended purpose can be achieved even without providing the conveyance rollers 36 and 37, but the separation roller 2
When the feeding path from 25, 26 to the pair of registration rollers 56 is relatively long, providing the above-mentioned conveying roller allows sorting to be reliably conveyed mid-way. If multiple stages 1)C are provided, by providing the above-mentioned conveyance roller for each paper feeder, it is possible to feed different types of sorting for each paper feeder.

Figure 3 shows a timing chart for sort feeding, in which the electromagnetic spring clutch is activated twice at the beginning,
While it is turned on intermittently, the first sheet is being fed,
Then, the second time, while that clutch is turned on twice,
The th sheet is fed. Figure 4 shows a timing chart for detecting whether there is a sheet in the paper feed section.After the sheet detection sensor detects the passage of the first sheet at a certain point, the sheet is sorted. The tip detection timer moves, and after the timer setting time, that is, the distance from the tip of the notebook in the paper feed section to the detection sensor 51 is reached.
If the leading edge of the next notebook is not detected by the sort detection sensor after the notebook movement time has elapsed, a no-sheet signal is generated, and it is assumed that there is no paper feed section K7-.
For example, a message to that effect is displayed on the operation panel of the copying machine.

FIG. 5 shows a timing chart for detecting whether or not a sheet is jammed on the sheet feeding path. For example, after the first sheet passes at a certain point, the second sheet The sheet detection sensor continues to hold the detection operation for the note, and this state is reached after the set time of the sort pass completion timer has elapsed, that is, the timer is activated.
If this is maintained even after the sheet movement time corresponding to the length of the sorting has elapsed, it is assumed that a notebook has jammed, and a message to that effect is displayed on, for example, the operation panel of the copying machine.

In this way, the sorting detection sensor is connected to the seventh sensor for detecting the presence or absence of sheets to be fed by the paper feed roller.
Further, a cover piece can be attached to each jam detection sensor for sorting on the sheet feeding path.

FIG. 6 shows an example of a control circuit for sheet feeding control. Based on the circuit shown in the figure, the electromagnetic spring clutch 33 is turned on and off, or the output diode 61 indicates that there is no sheet. It may occur, or a jam indication may be made at the older diode 62. In the figure, the paper feeding completion signal is a signal generated when the number of notebook sheets set on the paper feeding section matches the number of fed sheets.

By the way, in the above-mentioned embodiment, the separating rollers 25 and 26 of 1.chi..l are used as the separating device, and the lower separating roller is configured to be able to rotate in the note feeding direction. Instead of such a separation roller, a contact member 64 as shown in FIG. 7 may be used. This contact member 64 is provided with a friction pad 64a that contacts the separation roller 65, and the friction between this pad 64a and the separation roller 65 separates the sheets. Note that a sheet detection sensor 66 is provided on the lower tray of this separation device, and this achieves the same function as that of the previous embodiment.

FIG. 8 shows another paper feeding device, in which a paper feeding roller 67, separation rollers 68, 69, a conveying roller 70,
71! ! ::The present invention can be applied to such a paper feeding device as well.

Note that the sheet detection sensor 72 in the figure also achieves the same function as that of the embodiment described above.

As described above, according to the present invention, it is possible to correctly set the registration position of the 7-tooth in the pair of registration rollers, and the skew feed can also be corrected correctly.

Note that the present invention can be applied not only to copying machines but also to facsimile IJs and the like equipped with this type of paper feeding device.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a paper feeding device according to an embodiment of the present invention, Fig. 2 is a plan view of a sorting feeding conveyance system of the same paper feeding device, Fig. 3 is a sheet feeding timing chart, and Fig. 4 is a sorting 5 is a timing chart for detecting a sheet jam, FIG. 6 is an example of a sheet feeding control circuit, and FIGS. 7 and 8 are timing charts for detecting the presence or absence of a sheet. FIG. 7 is a configuration diagram of another example of a paper feeding device that may be applied. DESCRIPTION OF SYMBOLS 16...Paper feed roller, 20...Drive motor as a drive source, 25...Separation roller, 26.64...Contact member, Easy-...Electromagnetic spring clutch, 5h...
Sort detection sensor, 56... Registration roller pair

Claims (1)

[Claims] 1. Touching the tip side of the uppermost note of the sorted bundle, 7-
a paper feed roller that feeds the sheets from the sorted bundle position in the note feeding direction by rotating in the note feeding direction; a separation roller that rotates in the sheet feeding direction; and a separation roller that is in contact with the separation roller and is held in a stopped state while the separation roller rotates in the note feeding direction, and a plurality of sheets are fed from the paper feeding roller. a contact member that cooperates with the separation roller to separate and convey only the uppermost 7-tooth; Feed the sent note while holding it in your mouth, and make sure that the tip of this note reaches the target feeding section at an opportune time (a pair of registration rollers whose rotation start timing is determined, the paper feeding roller and the separation roller). a drive source for rotationally driving each of the roller systems; a clutch means for disconnecting the drive transmission relationship from the drive source to the roller system to rotate and stop the roller systems, respectively; and the separation roller. and a sheet detection sensor that is provided on the sheet feeding path between the pair of registration rollers and detects the leading edge of the sheet advancing from the separation roller, and when the sheet detection sensor detects the leading edge of the sheet, this detection The feeding device is characterized in that, in response to a signal, the drive transmission relationship is cut off to temporarily stop the note, and after this stop, the drive transmission relationship is linked to feed the note toward the pair of registration rollers. Paper device. 2. The paper feeding device according to claim 1, wherein the sheet feeding path is provided with a pair of conveying rollers in the feeding path. 3. A sheet detection sensor. The sheet feeding device according to claim 1, characterized in that the sheet feeding device also serves as a sensor for detecting the presence or absence of a notebook to be fed by the sheet feeding roller.4. 2. The paper feeding device according to claim 1, wherein the paper feeding device is also used as a paper feeder for detecting a jam during sorting on the road.