DE2142867A1 - Scanning device for originals in copiers - Google Patents

Description

2H2867

K 2039 / Gbm 4931 PP-Dr.Hn.-mk August 12, 1971

description
to register

KALLE AKTIENGESELLSCHAFT Wiesbaden-Biebrich

for a patent

Scanning device for originals in copiers

The invention relates to a scanning device for originals in copiers in which on one or several rolls of copy material is kept in stock and due to the scanned length of the original the feed and cutting devices for the copy material are controlled.

Regardless of which special copying process is used, it is advantageous for copiers to use the Copy material in the form of an endless web on a

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or to hold several supply rolls, from which it is peeled off and cut depending on the length of the original can be. The device according to the invention is therefore suitable, for example, for thermographic and electrophotographic Devices as well as for blueprint machines.

In order to make copies of the same length as the originals, there is a switching element in the Document path is sufficient for scanning the leading and trailing edges of the documents when the delays when starting and braking the feed devices are the same. Otherwise a switching element is required for scanning the leading edge of the original and one for scanning the trailing edge of the original.

In the device known from German Offenlegungsschrift 1 497 492 for the automatic control of feed and cutting devices as a function of Jk _{1 of} the original length, the different delay times for switching on the feed and on the other hand for switching it off and actuating the cutting device are controlled by two separate switches

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compensated whose distance in the document path is adjusted accordingly. When working with the throughput speed, for which the switches are adjusted, you get with such a device copy material sections, which in their Length match the templates. However, if you work with this certain throughput speed different speeds, the copy material sections no longer match the length of the original because the delay times correspond to the throughput speed change. Most copiers do not work with just one, but with different throughput speeds. Therefore, the above-described scanning device controls the throughput speeds not considered, too imprecise for most copiers.

By scanning the leading and trailing edges of the originals, the edges of uncut originals become visible copied and thus unnecessarily used a lot of copy material. Also, the margin is on the copy undesirable, and therefore the copy must be trimmed in an additional and time-consuming operation. at a known device, the switching elements in the document path by the amount of the edge widths adjusted against each other so that the front

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The edge can be scanned later according to the width of the border and the rear edge can be scanned earlier. The switching elements sit on nuts with right-hand or left-hand thread. The nuts in turn sit on a spindle Right and left hand thread. By turning the spindle clockwise or counter-clockwise you can the switching elements are moved apart or towards each other. However, since one has the slope of the Spindle can not choose arbitrarily large, are to adjust the switching elements to the usual edge width several revolutions are necessary, which means that a separate scale is required for the number of revolutions to display.

If, in addition to the edges, the templates also have hanging strips for storing the templates, you have to use the just mentioned device, the hanging strips at their edge, which is adjacent to the end of the original, punch -an one Place which the switching element for scanning the trailing edge of the original passes - around the hanging strip not to be copied. This is a cumbersome additional operation.

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The object of the present invention was to create a scanning device for originals in copiers, in which the changing delay times for switching on and braking the feed device at different throughput speeds can be taken into account.

In a further embodiment of the invention, a scanning device should be created in which a simple and clear adjustment of the switching elements is possible and in which there is a perforation of the No need for templates with hanging strips.

According to the invention, a scanning device for originals in copiers is proposed for control of feed and cutting devices for the copy material held on at least one supply roll Depending on the length of the original, with at least one switching element for scanning the leading edge of the original and at least one switching element for scanning the trailing edge of the original, which is characterized in that that the feed and cutting devices have a

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Electronic time calculator, which is dependent on the throughput speed, can be controlled by the switching elements are.

By scanning the leading edge of an original placed in the copier by a switching element becomes the feed device for the copy material

^w switched on. This conveys the material at the same speed as the original is transported through the opened cutting device to transport elements which bring the copy material together congruently with the original and transport it to the copying station. After the trailing edge has been scanned by another switching element, the feed device is braked and the web of copy material is cut.

In copiers in which several rolls of copy material with different properties, e.g. width, light sensitivity, are kept in stock, each of which includes a feed device, lie in the document path further switching elements for scanning the width of the original, e.g. from the German utility model 1 977 676 is known. Because of the sampled

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Width one of the copy material rolls is selected, from which then according to the scanned length Copy material is peeled off and cut. The length scanning is independent of the width of the Template always with the same switching elements. With such a device, the originals are always on the same Introduced the guide rail of the infeed table. Are the originals according to their width on the inserted on the right or left side of the input table, so are useful in the document path for both the right as well as for the templates entered on the left, there are switching elements for scanning the template length, wherein the switching elements for the documents entered on the right are the feed device of the one supply roll control, while the switching elements for the templates entered on the left control the feed device of the control another supply roll.

The switching elements can be mechanical switches, such as microswitches, or photoelectric switches, such as reflex light probes. The feed means may Jn known manner of endless conveyor belts, ^t. \ "Alsenpaaren or the like.

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An electronic time computer is connected to the control circuit of the switching elements for scanning the length of the original, which forwards the signals of the switching elements to the clutches and brakes of the feed and cutting devices after certain delay times. The delay times are calculated by him as a function of the voltage applied to the main drive motor of the copier. In the calculation of the delay times W voltage by the time calculator will also characteristics, which take into account the individual characteristics of the feed device being used.

By scanning the trailing edge of the original, the feed device and the cutting device are switched off actuated. In order to get a clean cut, the material web should stand during the cut, fe Since the feed device usually needs a certain amount of time before it comes to a standstill, it is advantageous to that coming from the switching element for the trailing edge scanning via the electronic time calculator Signal for braking the feed device and actuation

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of the cutting device to the cutting device only after a certain delay time. For this purpose, a timing element is connected in the control circuit, which is also dependent on the throughput speed is dependent.

As has just been stated, it is advantageous if the feed device is at a standstill during the cut. Around To transport copy material and original congruently to the copying station, it is advantageous if the transport elements behind the cutting device continue to convey continuously during the cut. To prevent the copy material from tearing as it is between a standing feed device and conveying transport elements, you can, for example, in a known manner Before cutting, build a loop in the copy material behind the cutting device (German utility model 1 984 436) or a movable guide behind to the cutter (Belgian patent 757 875) · Through the loop as well as through the movable one Leadership is given a time margin,

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within which the cut can be made without the material tearing. Therefore it is not necessary to do that To let the timer also work as a function of parameters that define the individual properties take into account the cutting device used.

The feed device should be used to scan the length of originals with a border that is not to be copied according to the width of the edge are not employed until later and are parked earlier and the cutting device be actuated earlier accordingly. These waiting times are longer in the first case and shorter in the second for the transmission of the impulse of the switching elements can be determined by the electronic time calculator, if you also let it work depending on the width of the margin. However, this is an increased technical control effort necessary. Therefore, in a preferred embodiment, the switching elements for Sampling of the original length in the original path arranged adjustable against each other, so that the switching element for the scanning of the leading edge is shifted backwards, seen in the direction of the original, and that

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Switching element for trailing edge scanning is moved forward. This adjustment is preferably done with a lever that adjusts the degree of adjustment that corresponds to a certain margin width on a Indicates scale. A lever can be used for each switching element; however, both are appropriate Switching elements adjusted with a lever.

In a preferred embodiment, the switching elements sit ' on carrier plates that can be adjusted by means of a T-shaped lever.

To scan the length of originals with borders and hanging stripes that should not be copied the switching elements, as described above, shifted against each other by the amount of the edges in the document path. In addition, you can switch the switching element for trailing edge scanning by the amount corresponding to the width of the Hanging strip corresponds, through a separate device in the document path to the front, in the direction of the original infeed seen, adjust. Since the hanging strips are relatively wide, the switching element would have to for the trailing edge, however, can be adjusted over a considerable distance in the document path. Therefore, it is It is more advantageous to adjust the switching elements only according to the edge width and the width of the hanging strip not through a mechanical adjustment, but through an electronically calculated, correspondingly shorter waiting time

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time for the transmission of the signal to brake the feed device and to actuate the cutting device to consider. Are the switching elements in the template path so arranged that when templates with hanging strips for the transmission of the pulse of the switching element for trailing edge scanning negative waiting time would result, you can use the switching element to scan templates with hanging strips park for trailing edge scanning. The trailing edge scanning is then carried out by a further forward in the Original path located switching element.

The invention is to be explained in more detail with the aid of an exemplary embodiment and with the aid of the drawings.

Show it

Figure 1 is a vertical section through the feed

and cutting devices of the copier ρ parallel to the direction of material transport,

Figure 2 is a schematic representation of the control circuit of the scanning device,

characters

3 and 4 plan views of part of the scanning device in different positions,

Figure 5 is a front view of part of the control panel for the scanning device.

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The copy material is kept in stock on two rolls 1 and 2, from which the material webs 3 and 4 are drawn off with the aid of the take-off roller pairs 5 and 6 and transported by the feed roller pairs 7 and 8 to the open cutting device 9. Behind this, the respectively selected material web 3 or 4 is moved along a movable guide 10 to a pair of rollers and transported ₃ by this to a second pair of rollers 12 where the copy material web 3 or 4 is brought together with the original 13. The original 13 and the copy material web 3 or 4 are jointly conveyed by the second pair of rollers 12 to the copying station, which is no longer shown. Between the pairs of take-off rollers 5 and 6 and the pairs of feed rollers 7 and 8, a collecting roller 14 or 15 is attached. These collecting rollers 14 and 15 can be displaced in their guides 16 and 17 into the dot-dash positions and have the effect that there is always enough paper, which is relieved of the roller weight, on the feed roller pairs 7 and 8, respectively.

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The original 13 is fed into the copier via the input table 18 and from the roller pairs 19 and 20 transported past the switching element group 21 to the pair of rollers 12.

The switching element group 21 consists of the switching elements 21a and 21b for the templates entered on the left and the switching elements 21a 'and 21b' for the templates entered on the right (see FIG. 2). Will Another roll of copy material is kept in stock in the copier, so is in the document path in front of the Switching elements 21a, 21b, 21a 'and 21b', a further switching element, not shown, which when actuated switches on this third supply roll with its feed device by the template. The sampling of the In this case too, the length of the original is provided by the switching elements 21a 'and 21b'.

The switching elements 21a and 21b as well as 21a 'and 21b' are adjustably attached in the document path. The figures 3 and 4 show this on the basis of the switching elements 21a and 21b. The same applies to those in the figures 3 and 4 switching elements 21a ', not shown

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and 21b ^! . The switching element 21a scans the leading edge of the original and the switching element 21b scans the trailing edge of the original. The switching elements 21a and 21b sit on
the carrier plates 22 and 23, which are in the longitudinal slots

24 are adjustable. By driving pins 25 are
the carrier plates 22 and 23 are connected to a T-shaped lever 26, namely each of the carrier plates 22
and 23 connected to one of the two shorter lever arms 26a and 26b of the lever 26. The lever arms 26a and 26b have transverse slots 27 in which the driver pins

25 can slide. The driving pins 25 are firmly mounted on the carrier plates 22 and 23. If the longer lever arm 26c of the T-shaped lever 26 is adjusted along the scale 28 on which the various edge widths
are applied, the T-shaped lever 26 rotates about its axis 29. During this rotation, the carrier plates 22 and? 3 are moved by the driver pins 25 in
the longitudinal slots 2U and thus the switching elements 21a and 21b adjusted. The longer the lever arm 26c is in relation to the lever arms 26a and 26b, the more the okala 28 can be spread.

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This allows the relatively small displacement of the. Switching elements 21a and 21b can be adjusted more easily and more precisely. Figure 3 shows the positions the switching elements 21a and 21b, the carrier plates 22 and 23 and the T-shaped lever 26, if templates should be copied without a border. The switching elements 21a and 21b are then on the same Height. FIG. 4 shows the corresponding positions when originals with the widest margin are copied should. The switching element 21a for scanning the leading edge of the original is then the width of the edge shifted backwards accordingly and is only reached later by the leading edge of the original, while the Switching element 21b for the scanning of the trailing edge of the original has been moved accordingly far forward in the path of the original so that the trailing edge of the original is scanned earlier.

The functional sequence is to be described in the following for the case, 'that an original without a margin on the left side of the input table 18 is inserted. The original 13 is gripped by the pair of rollers 19 and with a certain adjustable diameter

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running speed transported into the copier. The switching elements 21a and 21b are reached simultaneously (see FIG. 2) from the front edge of the original. The switching element 21a, when actuated, sends a signal through the front edge to the amplifier with a built-in AND element, which only forwards the signal when both switching elements 21a and 21b are actuated by the original. The signal passed on by the amplifier 30 excites the relay 31, as a result of which the switch S31 assigned to it is lifted from the contact 32 and applied to the contact 33. The electronic computer 3 ^ receives a pulse and calculates a waiting time. This waiting time depends on the voltages delivered to the computer 3 ^ by the potentiometers 35 » 36 and 37, which take into account the individual properties of the feed device, as well as on the voltage delivered by the tachometer generator 38, which corresponds to the selected throughput speed.

After this waiting time has elapsed, the relay 39 is briefly energized, as a result of which the switches S39 and S39 ^{f assigned to it are} briefly closed. This will

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the relay 40 energizes while the relay 40 'does not is excited because the circuit is not closed by the switch S31 'at contact 32'. The relay 40 closes the switch S40a assigned to it and remains above the switch provided by this switch established contact and the contact of the switch S4l itself when the switch S39 is opened again. By the energized relay 40, the switch S40b are also placed from the contact 42 to the contact 43, whereby the connection to the electronic timer 44 is interrupted, and the switch S40c from contact 45 on the contact 46 placed. As a result, the brake 47 of the Feed roller pair 7 is de-energized and the coupling 48 of the feed roller pair 7 is energized.

The pair of feed rollers 7 runs and conveys the copying material web 3 with the same throughput ψ speed at which the original is transported 13 through the cutting device 9 and on to the roller pair 11. As a result of starting the feed roller pair 7 raises the collection roller 14 in its guide 16. She operated the switch 49, what

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a starting of the take-off roller pair 5 has the consequence. The copy material web 3 is withdrawn from the roll 1, faster than the feed roller pair transported. Therefore, the collecting roller 14 lowers and thereby switches the pair of take-off rollers 5 off again. This process is repeated several times according to the length of the original.

The original 13 and the copying material web 3 meet at the roller pair 12 and are conveyed together to the copying station. When the trailing edge of the original releases the switching element 21b (in this case the switching element 21a is also released at the same time, since both are at the same height), the relay 31 is de-energized and therefore the switch S31 is lifted from the contact 33 and connected to the contact 32. The pulse thus given to the computer 3 ^ causes the computer to calculate a waiting time again, which depends on the parameters already given above. After the calculated waiting time has elapsed, the relay 4l is briefly energized, and as a result the switches S4l and S4l 'assigned to it are briefly opened. The latching contact of relay ¹ JO is activated by the short

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early opening of switch S4l interrupted, the relay 40 is de-energized. The switch S40a is opened, switch S40b is connected to contact 42 and switch S40c is connected to contact 45. Through the When the switch S40c is actuated, the clutch 48 of the feed roller pair 7 is de-energized and the brake is de-energized excited, whereby the feed roller pair 7 is braked and comes to a standstill.

When the switch S40b is actuated, the electronic timer 44 receives a pulse. It calculates depending on the voltage applied to the tachometer generator 38, a waiting time during which the copy material web 3 is located between the stationary pair of feed rollers and the pair of conveying rollers 11. A tension on the copy material web 3 *, which leads to a tear, is avoided by the movable guide 10, which is displaced in the direction of the arrow by the copy material web 3, which rests against the guide 10 and releases a shortened path for the copy material web.

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After the waiting time has elapsed, relay ^ O is briefly energized. The switch S50a assigned to it is opened briefly, thereby de-energizing the brake 51 of the cutting device 9; the second switch S50b assigned to the relay 50 is briefly closed and the clutch 52 of the cutting device 9 is thereby excited. The upper cutter 9a then executes a lowering and lifting movement by a single rotation of the eccentric shaft 53j. While the upper cutter 9a is lowering, it releases the microswitch 5h , as a result of which the switch S54 is lifted from the contact 55 and placed on the contact 56. The clutch 52 therefore remains energized, although the switch S50b is opened again. The upper knife 9a cuts the material web 3 » as soon as it comes into engagement with the fixed lower knife 9b. As a result of the subsequent stroke movement, the upper knife 9a returns to its starting position and actuates the microswitch 5 ² I. The switch S5 ^ is again placed on the contact 55, thereby de-energizing the clutch 52 and energizing the brake of the cutting device 9.

The corresponding processes take place when a template is introduced to the right of the input table.

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If an original with a margin is to be copied without copying the edges as well, the lever arm 26c becomes the Width of the edge shifted accordingly on the scale 28 (see Figures 3 and 4). The switching element 21a for scanning the leading edge of the original is pushed back in the path of the original while the Switching element 21b is moved forward for scanning the trailing edge of the original. Template 13 happens first the switching element 21b. As soon as the front edge of the original 13 is actuated, the switching element 21a is A signal is given via the amplifier 30 which energizes the relay 31. The ones described above are running Operations. As soon as the switching element 21b is released from the trailing edge of the original, the relay is 31 is de-energized, and the processes described above at the corresponding point take place again.

If an original is copied with a border and hanging strips, the lever arm 26c is corresponding to the width of the The edge shifted on the scale 28 and the switch 57 is set to the "hanging strip" position. Through this the switching element 21b is turned off and

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the switching element 21c is switched on and an additional potentiometer (not shown in FIG. 2) is prepared for a connection to the electronic computer 34. With the aid of the switch 58, which is set to the value which corresponds to the total width of the hanging strip and the rear edge, a corresponding voltage is set on the potentiometer just mentioned. The processes in the control circuit are the same as those described above, with the exception that the trailing edge of the original is scanned by the switching element 21c, and the waiting time determined by the electronic computer J> k , after which the relay 4l is briefly energized, by the time Shut off the feed device 7 and actuate the cutting device 9, still depends on the voltage value of the additional potentiometer.

For scanning the trailing edges of originals with borders and hanging strips, it is not absolutely necessary to turn on the additional switching element 21c. The scanning can also be carried out with the switching element 21b will. In this case the additional potentiometer would have to be prepared with switch 57,

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and with the switch 58 a voltage value can be set on this potentiometer, which is only the width of the hanging strip, since the position of the switching element 21b in the template path already corresponds to the width of the lower margin taken into account. However, since the hanging strip and the rear edge often overlap, the Dimensioning the total width of the rear edge and hanging strip easier as they are when scanning through the switching element 21c is made. In addition, the switching elements 21a and 21b can be in one place lie in the document path, on which when copying originals with hanging stripes and edges during scanning the trailing edge would result in negative waiting times. In this case the trailing edge must be scanned the switching element 21c lying further forward in the document path take place.

With the switch 57 the "manual" position can still be switched on, whereby the automatic is parked for scanning and the copy material is cut off by hand, e.g. using a rip cord can be.

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If test strips are to be cut from the copy material in order to check the set exposure, so the switch 57 is first switched to the "automatic" or "hanging strip" position and, as soon as the leading edge of the copy material forms an image window that is in the path of the copy material to be cut is, happened, the switch 57 is switched to the "sample strip" position. This will activate the relay 41 excited and thereby, as described above, shut off the feed device and the cutting device actuated ..

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Claims (6)

2H2867 Pat en tan sayings Scanning device for templates In copiers for controlling feed and cutting devices for the copy material held on at least one supply roll, depending on the length of the original, with at least one holding element for scanning the front edge of the original and at least one switching element for scanning the rear edge of the original, characterized in that the feed and Cutting devices (7> 8, 9) can be controlled ^{via an electronic time computer (3 2} J) dependent on the throughput speed by the switching elements C21a ₅ 2Ib ₃ 21a ¹ , 21b '). 2. Apparatus according to claim 1, characterized in that the cutting device (9) additionally via one that depends on the throughput speed electronic timing element (44) can be controlled by the switching elements (21a, 21b, 21a », 21b ·). 3. Apparatus according to claim 1 or 2, characterized in that the switching elements (21a, 21b, 21a ', 21b ¹ ) by means of at least one lever (26) in the template . are adjustable away, the lever (26) indicating the degree of adjustment on a scale (28). 2098A4 / 1000 2H2867 4. Apparatus according to claim 3 »characterized in that the switching elements (21a, 21b, 21a ^!, 21b ') are adjustable by means of a T-shaped lever (26). 5. Device according to one of claims 3 or 4, characterized in that the switching elements (2Ia ₅ 21b, 21a ¹ , 21b ¹ ) are mounted on carrier plates (22, 23) which are adjustable by means of the lever (26). 6. Device according to one of claims 1 to 5, characterized in that there is a switching element (21c, 21c ¹ ) for scanning the trailing edge of templates with hanging strips in the document path. 209844/1000