DE1935425A1 - Device for stacking and transporting individual sheets of paper - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann, 1935425

Dipl.-Ing. H.Weickmann, Dipl.-Phys. Dr. K. Fingke Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, DEN

PO Box 860 820

MÖHLSTRASSE 22, CALL NUMBER 48 3921/22

TELAUTOGRAPH CORPORATION, 8700 Bellanca Avenue, Los Angeles, California, V.St.A.,

Device for stacking and transporting individual sheets of paper

The invention relates to a feed mechanism for paper sheets, which can be used, for example, to feed individual paper sheets, such as documents or drawings, to be removed from a stack one after the other and fed to an image transmitter.

There is some type of picture transmitter that is a stack of sheets of paper with recordings and feed one sheet at a time to a scanner. The scanner is scanning lines off the sheet line by line and transmits the image to a remote recipient. In order to have a trouble-free To ensure automatic operation, the feed mechanism may only have one at a time. Bow from the pile and must keep at least a small space between the individual sheets. To the device To be able to use the space as efficiently as possible only be very small between the individual arches.

In an earlier feeding mechanism, an abeta » pel3? olle provided one arch after another by Brings the stacking holder onto a conveyor belt. The Trans

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portband grabs the sheet and brings it more slowly Speed, approximately 15 cm / min (six inches per minute) under an optical scanner. The destacking roll rotates continuously to remove one sheet at a time from the stack, but at a slightly slower speed than that of the conveyor belt movement, to create a small gap between the trailing edge of one sheet and the leading edge of the next. Over time, the destacking rollers wear out and begin to slide on the paper, so that a increasing distance between the individual leaves arises · This leads to the fact that the user has to bear the high transmission costs increasingly for periods of time in to which no image is transmitted · To do this, push the Abatapel rollers the sheets often in an inclined position and the subsequent sheets then tend to assume the same inclined position, so that the one located near the edges of the sheet Recording content is not transferred "

The present invention is based on the object a slow-speed feeding mechanism to create in which a skewing of the slatters largely avoided and compliance with a low, but a defined distance between the successive sheets is ensured · In addition, in to a greater extent an inevitable control of the sheet feed · » can be achieved

The mechanism according to the invention for the positive control of a sheet feed while largely avoiding it of skewing of the sheets and under reduction of the distance between successive sheets can be used, especially with eii'Mis image transmitters, in which the sheets are slowly brought under a scanner *

The inventive sheet feeding mechanism comprises

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a slow transport part for the actual conveyance of the sheets, as well as a sonell transport part, which picks up the sheets one by one from a stack and feeds them to the slow transport part. Near the point where the sheets run from the fast transport part to the slow transport part, a 3? Ühlsehalter is attached, which can be actuated by the sheets. If the ITühlsehalter ansprioht on the leading edge of an incoming sheet, it switches the quick transport section from · If he perceives the trailing edge of the sheet, he sohaltet the quick transport part again eia _$ so that another sheet subsequently supply. At the transition point between the fast and the slow transport part there is also a stop for the leading edge of the sheet to stop the sheet »

Ba the Sehnelltrazisport part only then put into operation if the previous sheet is the place de @ lühlachalters has happened, weö the distance between the leaves small and kept at a constant length "Even if there is a slight slip in the sonic transport section, this does not cause an undesirable increase in the distance between the leaves, because the fast transport part as long is in operation until the sheet has reached the slow transport part. If at the end of the fast transport route the speed of the sheet is decelerated, then any major misalignment is removed again, because the front edge of the sheet is realigned to the stop parallel to the transport path

In one embodiment of the invention in conjunction with The sheet feeding mechanism contains its application in an image transmitter a stacking holder that holds the sheets in a substantially vertical position so that they can open their edges come to rest. The rapid transport part has a stacking roller made of soft rubber

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and a medium-hard backing roller on the underside of the stack are arranged with a single sheet between them. The stacking. roll is driven at a relatively high speed and transports the respective sheet into the Inside of the image transmitter where the sampling takes place.

In this embodiment of the invention, the slow transport part comprises a conveyor belt which is driven slowly and a pressure roller that attaches the paper

P presses the conveyor belt. The feeler so-called instructs you Pair of electrical contacts on that near the inlet point arranged between the conveyor belt and the pressure roller are. If a sheet has reached the inlet part, it will be the contacts separated «If there is no sheet at the entry point, the drive motor for the stacking roller switched on for the rapid feeding of a sheet until the leading edge of the sheet between the The conveyor belt and the pressure roller have run in. This opens the grinder switch and the motor of the Stacking roller switched off · When the drive of the conveyor belt has transported the sheet far enough so that

t the trailing edge of the sheet has passed the sensor switch, it closes again to put the motor of the stacking roll into operation.

Each new sheet of paper taken from the stack moves for this time quickly until its leading edge is the entry point touches between the conveyor belt and the pressure roller · Any tilting of the sheet is caused by the impact its leading edge lowered on either side of its center · If the sheet is crooked, it will be on its back continues to advance while its front is stopped by the fence. This will straighten the sheet

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Further details of the invention are in the claims, laid down «The drawings show an example of execution of the subject matter of the invention, which is described below will*

Iig.1 shows inventions B. Blattzufüiirungeaeehanisraus la side Setoittan sees gate guftOa » tion of a sheet

Pig x 2, the Yorriohtung gesiäS aeigt fig _o 1 -in a par »tial side Sohnittansiont during the feeding of a sheet $

Fig.3. shows the rotation according to Mg ₈ 1 in a front view and

Pige4 a side view of the same along the line 4-4 the

Ügo5 ^ eigt a © l @ ktrisoh © s circuit diagram gm B © tri © Tä one

ligoi shows @ in © n Seilaueschnitt from an image, which has a frame 11 with -eiasra stacking holder 10 for aia sheet stack 52 * Jsäes sheet of the stack carries a picture in the form of geöruolstan odor hancigQsohriefeenen font j a photo © äer eia © r soastigsa Informs * »Tion _e The sheets are brewed close to one another along eia® @ Transportwgges under a scanning opening 12 Ia this dept as t opening is © in by. © iaer incandescent lamp 14 «the light bundle concentrated by means of a® mirror 16. An electrical circuit, not shown, converts the optical image broken down in this way into electrical signals that are transmitted via telephone lines ο the like. au a distant

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Receivers will be transferred, where the picture will then be returned will be produced·

To see the information contained in the entire stack of sheets To transfer, the sheets must be fed one by one through the transport path of the scanning opening 12. Of the Bildsender is often used for transmissions over long distances, for example across the whole country, and the The fees for the use of the telephone cables are relatively high.

fe would stand between the trailing edge of one sheet and the leading edge of the next sheet are as small as possible so as not to waste airtime by transmitting long gaps · On the other hand It is important to ensure that only one sheet is brought to the scanning aperture at a time so that the the entire information content of a sheet is transmitted · In addition to maintaining small sheet spacing, the feeding medfeanism also prevent the leaves from standing up significantly. This is necessary because the width of the scanning opening 12 corresponds essentially to the width of the sheets lying in the stack holder 10 by a scan on both sides outside the sheet off "

Close W · If the sheet is crooked, however, parts on both sides of the sheet cannot be scanned and there is no complete image transfer.

The sheet feeding mechanism includes a portion that each Sheet at low speed under the scanning aperture 12 brings · This slow transport part 22 has a transport belt 24 made of rubber, which runs over a drive roller 26 and a tension pulley 28 runs. The drive roller 26 moves at a slow rate, such as 1/10 inch (2.5 mm) per second. The conveyor belt moves consequently at the same low speed un ~

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ter the scanning opening 12. An Andruokrolla 30 and its counter roller 32 rest on opposite sides of the conveyor belt 24. Both rollers are revolving "rollers" The pressure roller 30 is fixed with its Aohs® 34 on the frame 11. The roller 32 is rotatably attached to the end © © Ines arm 36, is articulated at 38 and under the influence of a Spring force is pressed near the top against the pressure roller. First of all, every sheet carrying a recording is picked up between the pressure roller 30 and the conveyor belt 34. The counter roller 32 can move down far enough that the forward direction of the paper is detected o

The movement of the paper from the stacking holder 10 to the slow transport part 22 takes place with the aid of a primary transport part 40 which has two aluminum stacking rollers 42 on a stacking shaft 44. On one side of the stacking holder 10 opposite the stacking roller © 42 there is © in © counter-holder roll 46 on a counter-rotating counter-directional stack © lw © ll © 44. Shaft 48 arranged » D <sv stack holder 10 has © in narrow mouth 50 β The abutment roll © and as a counter-holder roll protrude with one of their circumference through openings in the stack holder directly above the mouth 50 substantially vertical position, a paper stack 52, whose leaves contain records which are to be transmitted "a attached to the frame bar 53 'which bears against the front of the stack 52, prevents the stack from falling over 47", the rotatable _o Two centering jaws by means of a hand- Spindles 49 can be moved closer to and away from each other, keep the stack of paper in the middle of the high-speed transport path. "

The destacking shaft 44 is connected to the output shaft 56 of a destacking motor 54 via a belt chain

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the destacking motor 54 is switched on and rotates the destacking roller 42 at high speed of about a few revolutions per second. The stacking roller 42 engages . the lowermost sheet of the stack, designated 55, and guides it along a sheet formed by a guide plate 58 Initial Path · The sheet continues this path until it reaches the entry point between the pressure roller 30 and the Conveyor belt 24 reached. The leading edge of the sheet 55 directs the conveyor belt 24 and the one below Counter roller 32 by a small distance down from the ^ Sufficient that the leading edge is between the pressure roller 30 and the conveyor belt in the illustrated in Fig <> 2 Way can insert

When the leading edge of the sheet reaches the entry point on the pressure roller, it lifts a contact 60 of the sensor switch 62 up. This establishes the electrical connection between the contact 60 and a further contact 64 interrupted below the paper. The opening of the Sensor switch 62 switches off the stacking motor

54 and for briefly engaging an engine brake, not shown. The stacking roll 42 is made in this way stopped quickly and is freewheeling so that she

"does not feed another sheet to the conveyor belt · The sheet

55 is now between the pressure roller 30, which at the end of the downward initial sheet path and the conveyor belt 24 engages the sheet then moves along a further path, which is determined by the conveyor belt, at a slow speed, about 1/10 inch / sec (2.5 mm / s) in direction of the Scanning device · As it passes through the scanning aperture, the image on it becomes optical for transmission scanned. The sheet then continues to move along the conveyor belt until it is in a storage bin 66 is stored *

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When the trailing edge of the sheet passes the sleeve holder 62, the contact 60 again comes into contact with the contact 64. This again activates the destacking sensor 54, which drives the destacking roller 42 so that the next sheet of paper is from the stack withdrawn 52. UNOE represent along guide plate 58 sur inlet point of the pressure roller "moves wirä the commissioning of the Abstapelmotors 54 and exerts Abstapalrollen Sowia their Betriebsgesohv;. inälg · * ness are chosen such that the leading edge of the next sheet, the inlet point of the Andruckroll © 30 to a Time reached when the trailing © Kant® of the preceding sheet has just passed the inlet parts. This indicates a distance between the sheets that is only very small, about 1/8 inch (3.2 mm) _& the motor 54 accelerates the stacking roller surprising that Blattstapal woduroh shaken in the stack holder and u & m supported © Page moved gsgsnüber the other? * ird <> is has siöJa h © rausg © stelltj AEAI it di © Sr © n nmng ü®v leaves beglia «· Estigt and isiesgntlioh the danger v®rminä © rt ₉ that m @ te will be stacked as one leaf

The Abstapeirollen 42 are made of soft 6-ujimi old sisiem gegsnübsr d @ m üqb paper high R®ibungsko @ ffisieatan "This friction coefficient is höhar as ά®τ Eeiifeujagsk ©» »efficiently from paper to paper or d @ rj®aig © ύ® τ Se »» genhalt © roll © 46 g © g © n paper o As a result, a sheet in contact with the rotiar © sd®n Abstap © lrolls is moved along the path along the conveyor belt, among other things through another sheet or through the Gageahalt © roll, that © in contact with the surface of the sheet is held back o A slight hataehea @ r roll on the paper can take place awar "but it is hardly more than ü®n fraction of a revolution of Abetapelrollee Sin such slippage does not significantly to the distance zwisohen consecutive Blät ··

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tern at the drain opening 12, because the previous one Sheet advances only a small fraction of an inch through the scanning aperture for a whole Rotation of the stacking roller takes place. The advantage of the continuous rotation of the stacking roll up to the moment where a sheet near the inlet parts of the pinch roller is perceived, becomes clear by comparison with previous feeding mechanisms in which the distance between successive leaves would increase by almost the full amount of each slip

The backing roller 46 is preferably made of a material with a lower coefficient of friction against Paper than the stacking roller 42 has against paper, but with a coefficient greater than that between two sheets of paper. The backing roll can consist of medium-hard rubber or relatively soft plastic. The shaft 48 of the backing roll rotates in the direction indicated by the arrow 49 during the whole time in which the device for scanning the sheets is in operation »As a result, the blessing holder roll endeavors to put every sheet that goes by it into the stacking holder 10 move back. In some cases there can be two or more sheets of paper between the stacking roller and the Counter-holding roller, aowie through the mouth 50 in the direction of das Transpoi'tbaiid run «The superfluous leaves become unlikely to get to the entry point, but one can Piece of the way traversed the counter-holding roller 46 rotates slowly at a peripheral speed of about Half the speed of the conveyor belt, so that the number of sheets in excess is gradually returned to the stacker This prevents the feeder from jamming »The backing roller does not move a sheet back, which has already reached the entry point of the pressure roller 30 has because such a sheet between the pinch roller and is held on the conveyor belt

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When a sheet of the stack 52 is accelerated by the Atsetapelrolle in the direction of the conveyor belt, it can experience a slight inclination. This can happen, for example, if one of the stacking rolls slips ₉ while the other does not, or if one pile slips more than the other. Such skewing is usually eliminated ₉ when the sheet hits the entry point of the pressure roller 30. This is the pail because the pressure roller 30 extends practically over the entire width of a sheet, apart from a central part of the roller, the diameter of which is changed to make room immediately in front of the Einlanfatel-Ie of the pressure roller. If a sheet is crooked, its leading edge is not parallel to the length of the entry point of the pressure roller. As a result, one side of its leading edge reaches the entry point first and if the leading edge at the entry point touches the conveyor belt or the pressure roller ", the sheet is compressed on the leading side which leads to the lowering of the standing position *

The image transmitter is usually kept in constant readiness so that the entire apparatus is on Operating temperature is »During the standby position however, the lamp 14, a copy motor 72 which drives the drive shaft 26, and the backing roller 46 and the stacking motor 54 is switched off. The establishment can be put into operation by inserting a first sheet of paper through an input port 70 for manual operation this introduced to the inlet parts of the pressure roller first sheet opens the Pühlsohalter 62, which the device put in the operating state · While the device is in the operating state, the lamp 14 and the copier motor 72 is continuously switched on, whereas the

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stapelmotör 54 is only switched on when each the sensor switch 62 is closed. The copier motor 72 drives a transmission chain 75 that controls the conveyor belt. shaft 26 rotates, as well as the shaft 48 of the counter-holding roller.

The first sheet moves along the conveyor belt until its trailing edge has passed the contact 60 to it At this point in time, the destacking motor 54 rotates the destacking roller 42, which feeds the next sheet to the conveyor belt «When the trailing edge of the last sheet in the stack

If 52 passes the contact 60, the destacking motor 54 is switched on and the destacking roller 42 begins to rotate. After a predetermined period of a few seconds, the device is put into the standby or idle state with the lamp 14 and the motors 54 and 72 switched off a halt if a malfunction occurs that stops the feed to the conveyor belt. In order to restart the device, one can push another sheet through the slot 70 by hand

* direction to put into the operating state and the feed to initiate the first sheet »

Pig · 5 is a circuit diagram showing the paper feeding device automatically starts or switches off and controls the switching on of the destacking motor * The circuit comprises two electrical lines 80 and 82 which connect it to a power source indicated at 84, which can be a normal electrical outlet · The circuit between the power source and the copier motor 72 can through an operating switch 86 can be closed · The circuit between the destacking motor 54 and the power source can be closed

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closed by the operating holder 86 and the Fühlaehalter 62 · A timer 88 observes the state of the feeler switch 62 and controls in Beiais 90 that the operating switch 86 opens and closes. If the timer 88 determines that the feeler so holder is longer than a predetermined one Period is closed, so about several seconds, he operates the Helai 90 in the sense that this the operating switch 86 opens. As long as the Fühlsöhalter 62 'is open, or as long as it is not closed for more than a few seconds, the operating switch 86 remains permanently closed. A push button 92 is provided parallel to the operating switch 86 so that the operating button can be operated can be bridged when the device is switched on for the first time

The paper feed device can be put into the operating state in two different ways. First, by manually inserting a sheet of paper into the bin "running point of the pressure roller while opening the sensor switch 62". When the sensor switch 62 is opened, the timer 88 causes the relay 90 to close the operating bracket 86. Then the copier motor 72 is switched on, so that the conveyor belt, which brings the sheets to the scanning opening, starts to run . is in the stack 52, it is quickly fed to the conveyor belt and the sensor switch is opened again.

Another way of putting the device into operation for the first time is to simply load the stacker holder with a stack of paper and then press the pushbutton fed to the conveyor belt »This he«

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ate sheet opens the sensing switch 62 so that the device remains in operation When the trailing edge of the last sheet has passed the sensor switch 62, if this remains closed while the stacking motor 54 rotates, the compartment is set for a few seconds by the (Dimer 88 das Relay 90 out of power, which opens the operating switch 86 · The device is out of power Operation.

The paper feed mechanism according to the invention can expediently be used in connection with image transmitters, he However, it is also useful for other applications. The use of a rapid transport part for transporting the Paper to a part that the paper afterwards with lower Moving speed further, and the use of a feeler switch at the end of the sonell transport section secures the Keeping small distances between the sheets The arrangement of stops on opposite sides of the sheets, to suddenly slow it down, especially when the sheet is practically stopped or even when it to less than 1 inch / sec from a running speed slowing down at several inches per second allows for a substantial reduction in skew.

The invention is not limited to the exemplary embodiment described limited, but also includes deviations therefrom, which are also covered by the claims will"

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Claims (1)

Pat denied Device according to stacking and further transport ± he @ n of individual sheets of paper ₉ by a fast feeding member (4O) ₉ of the one a music from a @ a stack (52) emd decreases with @iner first Gesehwisiöigksit along sines first transport path leads _s acids lransportt a slow @ il (22), which is arranged ₉ flaS si? di @ Blätter Tom föbernehmea uand along a © s second transport path with sia @ r sweitaa speed visiterbeförä © rn & ann ₉ which is lower than the eret © speed ₉ and äureSi © ia®n feeler (62) ₉ on the passage one ® sheet at the connection point «· Ie swisshen dsm addresses first iaai i @ m second transport route and i @ a Schnelltransportt © 11 puts into operation« Zn Vorriehtiuag according ÄnspraoM 1 _g fiadurcli that the second speed is less than © 2 _S 5 cm / sec (1 inch / s) uaä the erst® speed © r Multi in "EHES feeträgte thereof Device according to claim 1 or 2, characterized in that that the slow transport part stops (30) contains, which are arranged on both sides of the center line of the first transport route and are at right angles extend to and to which those from the first transport » nudge the sheets that have been taken over and straighten themselves out of a possible misalignment Device according to claim 1, 2 or 3, characterized in that the rapid transport part (40) has a stacking roller (42) and a counter-holding element (46) which are on opposite sides of the first 909883/1 Transport path are arranged, as well as a drive device (54, 56) for the stacking roll (42), which is connected to the sensor switch (62), and "a second drive device (72, 73) for the continuous Drive the counter holder oil (46) in one direction in order to request the sheets back to the stack, and at a speed slower than that at which the destacking roller (42) is driven will· fc 5o device according to one of claims 1 to 4, characterized characterized in that the sensing switch (62) has two electrical contacts (60, 64) which are on opposite sides Sides of the sheet transport paths lie and pressed together to establish an electrical connection unless there is a sheet between them. 6 · A device according to claim 5, characterized in that the slow transfer member (22) comprises a current along the second transport path conveyor (24) for conveying the sheets, and a side-mounted pressure roller (30), and that the contacts (60, w 64 ) the sensor holder (62) - on both sides of the conveyor (24) at a point immediately in front of the entry point between this and the pressure roller (30) so that when a sheet arrives at the entry point, the drive of the sonell transport part is switched off « 7 · Device according to one of the preceding claims, characterized duroh a Sohaltteil (88), which the Sonell transport part (40) switches off after it has been in operation for a predetermined time longer than it Period of time corresponds to that in the normal operating cycle 9098 8 3/140 k between switching on the fast transport part and the arrival of a sheet at the transition point lies between the first and the second transport route » 8. Device according to one of the preceding claims for charging a picture transmitter ^ with individual sheets carrying the recordings to be sent, marked by a stack holder (10) for receiving a stack of sheets (52); a conveyor (24) carrying the sheets at a constant slow speed along a scanning path transported; a guide (50, 58) providing a path between the stack holder (10) and the conveyor (24); Destacking rollers (42), which the sheets along this Transporting the guide (50, 58) at a speed greater than the speed of the conveyor (24); a pressure roller (30) at the end of the guide (50, 58) formed path which presses the sheets against the conveyor (24); a sensing switch (62) which detects the arrival of a sheet at the pressure roller (30) and drive means (54) which rotate the stacking rollers (42) until the sensing switch (62) detects a sheet _e 9. Device according to claim 8, characterized in that the conveyor (24) is formed by a conveyor belt is and that the pressure roller (30) with two opposite Enäteile in contact with the conveyor belt stands, wherein a counter roller (32) the pressure roller and the conveyor belt presses against each other, so that a The stop for the incoming leaves is created, the oblique leaves straight and straight 9098 8 3/1404 10. The device according to claim 8, characterized by that a counter-holding roller (46) is arranged on the stacking holder (10) in addition to the stacking rollers (42), which rotates in the opposite direction of the stacking rollers and has a lower coefficient of friction than that Destacking rolls and which then also revolve in a manner that pushes the sheets back into the stacking holder, when the stacking rolls are standing. 11. Device according to one of claims 8 to 10, characterized in that in the absence of further The image transmitter is switched off for a certain period of time and the image transmission ends will· 90988 3 / UO 4 Blank page