EP0685419B1 - Adjustable guide for web material - Google Patents

Description

The invention relates to an adjustable guide for band-shaped material with different widths two that can be positioned at a distance from the respective bandwidth lateral guide elements, one of which is first is adjustable towards or away from the second one, wherein each guide element has a guide slot for the has assigned edge region of the band-shaped material, the two guide slots towards each other have, and a sensor for detecting the band-shaped material and / or markings in the Is attached near the guide slots.

An adjustable guide of the generic type is from the DE AS 1 235 634 become known. A card-shaped record carrier is between two relative to each other slidable guide elements passed through the Capture the border area on both sides. On one of the guide elements is a light barrier for the detection of the record carrier fixed.

A disadvantage is that only the edge area of the band-shaped material can be detected with the sensor is. The known leadership is therefore not suitable To capture markings that are spaced from the side edge of the band-shaped material attached are.

DE-C-969 651 describes a device for photoelectric Scanning marks on paper webs in Printing machines described. The one assigned to the sampling point optical system is telescopic across the paper web designed to be slidable.

Based on the prior art, the invention Underlying problem, a guide for band-shaped material to improve in that at any position markings attached to the band-shaped material are detectable by a sensor.

According to the invention the object is achieved in that the Sensor on at least part of the width of the band-shaped material slidably mounted slide is attached, and that the carriage on one of the guide elements, that is adjustable, slidably mounted is.

It is possible to match the sled with the sensor accordingly move further or less to the left or right. The slide is in the assigned guide element mounted longitudinally displaceable in the direction of adjustment, which is why this guide element to accommodate the Carriage guidance in the direction of adjustment, i.e. is longer than the guide element without a slide. Otherwise you can the two guide elements are designed in exactly the same way be.

The sled carries the sensor. With the help of one You can't just detect the presence of a tape monitor, but also in a regular subsection divided the individual sections feel carefully. The subdivision can be any Be done in a recurring manner Openings or imprints, e.g. in Form of small squares. Reflex sensors in here Question type are known as such, why further explanations are also unnecessary here. They exist from a transmitter and a receiver and can in extremely miniaturized construction. over the transmitter emits light which reflects on the band becomes. The receiver receives at least one Part of this light when there is a band or when the tape in the assigned area no breakthrough of any Kind has. However, if you keep the tape in regular If there are gaps in the distance, the light passes over it Hole and can no longer be perceived by the recipient will. This changed situation can be more appropriate and used in a known manner, for example Control of a step-by-step tape feed with feed steps according to the length of each section.

It is easy to see that the tape instead of regular recurring breakthroughs or holes or in addition to those small at its bottom not can have reflective prints. The effect is exactly the same when the beam of light hits one, non-reflective stain. This can also be used for control purposes of the type mentioned.

If both guide elements at the same time and in the same Dimensions adjusted laterally using an adjustment spindle the middle of the tape guide is independent of it effective width always in the same place on the machine. If from a wider band to a narrower one Band is transferred, so the two guide elements at the same time and in the same direction moving towards each other. On the other hand, should be a wider one Tape are used, so you move each of the two Guide elements to the outside and in turn in the same Dimensions and at the same time. This is then as required the center of the belt always at the same point on the guideway allocated for the band regardless of bandwidth. The adjusting spindle is advantageously rotatable but stationary.

Another embodiment of the invention provides that both guide elements in a preferably common Longitudinal guide are slidable. The latter can definitely Part of a belt processing machine or the like. be. The longitudinal guide prevents the guide elements from rotating when adjusting the adjustment spindle. Consequently can one over the rotary movement of the adjusting spindle Achieve sliding movement of the guide elements.

A further development of the invention going in this direction is that each guide element is two at a distance of guide flanks of a longitudinal guide Guide rail arranged for the guide elements preferably has parallel sliding surfaces. The leadership elements have an essentially cubic Shape.

A very useful variant of the invention is based on claim 6 out. Ensure the guide rods mentioned there a flawless tip-free guidance of the Slide on the guide element over the entire travel distance. For assembly reasons, it can be useful if the guide elements of different cross-section, for example. Diameter. Due to the use of guide rods you can click on a special slide guide do without in the guide element, so that none tight tolerances are required. It is not yet necessary on the one hand, a formal one that provides a rough guide Adaptation of the slide to its guide element.

A very advantageous embodiment of the invention takes place itself in claim 9. It applies when a tape is used which, for example, at least one of its longitudinal edges with openings or is "perforated". It can be around the longitudinal edge act which is the space between the two passes through opposing sensors. The sensor the carriage is switched so that it only still emits a beam of light and this from second, on the other side of the tape Sensor is always received when a longitudinal slot clears the way. This signal is used in the manner described above. From manufacturing technology Reasons, possibly even for economic reasons, it can can be quite an advantage if you consider both the first and also the second sensor as a reflex sensor with a transmitter and trains a receiver. Depending on what is scanned on the tape the receivers that are not required or transmitter switched off or on before commissioning will.

In this regard, a further embodiment of the invention proposed when moving out the carriage the second sensor is switched off and the one in the carriage located first sensor is connected as a reflex sensor.

Figur 1 eine Seitenansicht der einstellbaren Führung mit eingefahrenem Schlitten, wobei das bandförmige Material senkrecht zur Bildebene bewegt wird;

Figur 2 die Führung gemäß Figur 1 mit dem Schlitten in ausgefahrener Position;

Figur 3 eine Rückansicht der Führung gemäß Figur 1 in Pfeilrichtung A gesehen mit einer in den Figuren 1 und 2 nicht dargestellten Führungsschiene;

Figuren 4 bis 6 drei verschiedene Varianten des bandförmigen Materials zur Führung in dieser Vorrichtung;

Figuren 7 und 8 zwei weitere Varianten der Einstellvorrichtung für die Breite der Bandführung.

Further advantages, features and details of the invention emerge from the drawings which show various exemplary embodiments of the invention. Here represent:

Figure 1 is a side view of the adjustable guide with the carriage retracted, the band-shaped material being moved perpendicular to the image plane;

Figure 2 shows the guide of Figure 1 with the carriage in the extended position;

3 shows a rear view of the guide according to FIG. 1 seen in the direction of arrow A with a guide rail not shown in FIGS. 1 and 2;

Figures 4 to 6 three different variants of the band-shaped material for guidance in this device;

Figures 7 and 8 two further variants of the adjusting device for the width of the tape guide.

Essential elements of the adjustable guide for one band-shaped material 1 are two lateral guide elements 2 and 3 for the left and right longitudinal edge of the band-shaped material 1, which has an adjusting spindle 4 are coupled together. It essentially exists from a right-hand thread 5 and a left-hand thread 6. Die lateral guide elements 2 and 3 are with corresponding Threaded holes 7 and 8 equipped. The threaded spindle is in symbolically represented walls 9 and 10, for example. A printing press rotatably mounted. On hers one end projecting outwards carries an actuating element 11 preferably a knurled knob. Thus, a clockwise rotation, for example simultaneous and due to the same thread pitch uniform displacement of the guide elements 2 and 3 in the sense of arrows 12 and 13. A rotation in the opposite direction causes a displacement of the guide elements 2 and 3 against arrows 12 and 13. In the latter case, you can wider band-shaped materials in this guide be performed.

The longitudinal edges of the band-shaped material grip, according to Figures 1 and 2, in guide slots 14 and 15 of the side Guide elements 2 and 3. According to FIG 1 the guide slot 14 or 15 in the direction of displacement (Arrows 12 and 13) may be shorter than the guide element 2 or 3 itself. The height of the guide slot 14 or 15 should be chosen so that the thickest band-shaped materials guided by this guide 1 can slide through comfortably.

Because the two threaded bolts 5 and 6 of the adjusting spindle 4 of the same length and with the same thread pitch (but with different sign) and these threaded bolts 5 and 6 in the threaded holes at the same time the guide elements 2 and 3 are screwed in, the middle of the band is always independent of the bandwidth Assigned center of the adjusting spindle 4. So that's it band-shaped material 1 always regardless of its width centered in relation to the walls 9 and 10.

According to Figure 3, the two guide elements 2 and 3 in a preferably common longitudinal guide 16 slidably. For this purpose, each of the side guide elements 2 and 3 two at a distance from the guide flanks 17th and 18 a guide rail forming the longitudinal guide 16 arranged, preferably parallel sliding surfaces 19 and 20.

Each of the two guide slots 14 and 15 has according to of Figures 1 and 2 an upper edge 24 and a band-shaped material 1 supporting lower flank 21 or 22. At least one of the lower edges, in the embodiment 1 and 2, the lower flank 22nd of the second lateral guide element 3, is in the sense the double arrow 23 opposite its upper flank 24 slidable. This will make the lower surface Edge 22 greatly enlarged. In the embodiment can they take three times the length and up to the middle of the Adjustment spindle 4 are sufficient. The width remains a matter of course receive. It can be seen from Figure 2 that this Way the band-shaped material 1 over the majority its entire width can be supported.

The extendable flank 22 of the one guide slot 15 is from one in the direction of the fixed flank 24 facing surface of a carriage 25 formed on the relevant lateral guide element 3 in the sense of Double arrow 23 is slidably mounted. The sled 25 is on two for the direction of displacement of the guide elements 2.3 parallel guide rods 26 and 27 slidable stored, which in the holes of the two lateral Intervene guide elements 2,3 or enforce them. According to Figure 2, the length of the guide rods 26 and 27th equal to the side distance between the two walls 9 and 10 and you can in a manner not shown by means End pins in corresponding holes in walls 9 and 10 be plugged in, similar to the adjustment spindle 4 is provided.

The use of the slide 25 has a very special one Advantage. It can also be used for this be that at least one as a reflex sensor attaching working first sensor 28. Reflex sensors are known as such and therefore do not need any detailed explanation. You have one transmitter and one Receiver. For example, the transmitter sends out a light beam, which reflects on a surface provided for this purpose becomes. The reflected light is from the receiver of this Sensor 28 added. If the reflection from any Reasons not applicable, so you can do that in a more familiar way Way for switching purposes, control purposes, for the purpose exploit the count or in any other known manner. The electronics required for this, a computer or the like. are also known prior art.

Various embodiments result from FIGS. 4 to 6 of the band-shaped material 1. The simplicity for the sake of this, the bandwidth is chosen the same, although of course according to the above may vary as intended.

With dashed lines 29 and 30 it is indicated that the band is divided into individual sections. It can the band-shaped material is definitely a carrier act on which immediately follow one another or successively at the same distance Labels are arranged that are mentioned in the Printer should be printed. The labels can also be connected to each other by means of a perforation be. In any case is dashed by the two Lines 29 and 30 set a tape length for maximum printing is available. As a rule corresponding to all sides when printing Edge distances observed. But now for the exact printing such labels or sub-areas 31 of the band-shaped Ensure Material 1, the registration point of the front seen in the direction 32 End 30 and rear end 29 in the direction of flow 32 seen in front of the printing roller of the printing press, these ends 30 and 29 must be grasped very precisely. This is done using the first sensor 28 mentioned and, if necessary, also with the help of the explanations below of a second sensor 32.

Located in the area of dashed lines 29 and 30 different "marks", which of the or the Sensors 28 and 32 can be detected. In the embodiment according to FIG. 4 there are slits open at the edge 33 and 34. The band-shaped material 1 of FIG. 5 looks instead, breakthroughs 35, which compared to the band-shaped material 1 can be attached centrally and also arranged in the center of the dashed lines 29 and 30 are. Instead, see the embodiment according to FIG. 6, black or dark marks 36 that appear on attached to the back of the band-shaped material 1 are.

If now with the slide 25 extended (FIG. 2), the first Sensor 28 against such a central breakthrough 25 or a medium dark mark 36 is switching impulses or counting impulses deduce. In the case of the exemplary embodiment in FIG. 5 the light emitted by the first sensor 28 becomes as long reflects a breakthrough up to the first sensor 28 35 appears. The light then shines through this breakthrough 35 and is no longer perceived by the recipient. This means that the dashed line 30 in a very precisely specified distance from the printing roller or the effective surface line of the pressure roller. At a given throughput speed of the band-shaped Material 1 and precisely defined distance can be from Sensor 28 via a precisely working stepping mechanism the start of printing on this partial area 31 is determined very precisely will. The same applies to the end of the Printing process seen in the direction 32.

It is easy to see that one on the back of the Materials 1 attached dark or black mark 36 das can do the same. Furthermore, from the foregoing, that of course it's not absolutely necessary the breakthroughs or dark marks are centered on the to provide band-shaped material 1. With off-center attachment the carriage 25 with the first sensor 28 accordingly further or less far to the left or right shifted.

If a band-shaped material 1 according to Figure 4 use finds that either on the left or on the right edge also open edges 33,34 or on both edges also closed openings on at least one edge area has, so are preferably the first Sensor 28 and the second sensor 32 opposite each other. The two sensors 28 and 32 are not reflex sensors switched, but as a so-called fork light barrier. It sends e.g. the sensor 28 turns off the light, but does not receive reflected light. But if between an opening 33 for the two sensors 28 and 32 or 34 has arrived, the second sensor 32 can receive light emitted by the first sensor 28 and give a corresponding impulse.

Switching sensors 28 and 32 from "reflex mode" "Fork light operation" can take place automatically, for example. characterized in that with the extension of the carriage 25 of the Position according to FIG. 1, for example, that according to FIG. 2 the second sensor 32 is switched off and the first sensor 28 is switched to reflex mode. For this, on Carriage 25 a switch may be provided. Besides, can the slide 25 can be provided with a locking element, which with retracted slide 25 with the guide element 3 locked.

According to Figure 7, the side distance of the side Guide elements 2 and 3 cause the longitudinal axis the adjusting spindle 4 not in the sense of the double arrow 23 runs, but perpendicular to it. With the Adjusting spindle 4, a pinion 37 is connected in a rotationally fixed manner, which can be rotated in the direction of the double arrow 38. At 180 ° offset points of the pinion 37 are with this racks 39 and 40 coupled. this means For example, that when rotating the pinion 37 against the Clockwise the rack 39 from right to left and the rack 40 moves from left to right. In this Trap approach the two at the pinion rotation lateral guide elements 2 and 3 to each other. Because same gears are available, one reaches synchronous approach or distance of the two lateral Guide elements 2 and 3 and thus a narrowing or extension of the tape guide.

Figure 8 shows another variant of such a drive. Here, the adjusting spindle 4 is, for example, with the Handlebar 41 of a universal joint 42 rigidly connected. On the Shaft, the second link 43 is also rotatably mounted. Each link 41 and 43 has a fixed pivot point 44 or 45 and a longitudinally movable linkage 46 or 47. In this case, the hinge pin engages in a vertical one Longitudinal slot 47 and 48 a. Here are the fixed linkage 44 and the longitudinal slot 47 on the first lateral guide element 2, while on the second lateral Guide element 3, the fixed bearing 45 and the longitudinal slot 48 are attached. One turn of the adjusting spindle 4, for example in the direction of arrow 49, causes a even and uniform approximation of the two lateral guide elements 2 and 3 Counterclockwise rotation an opposite Adjustment movement with corresponding widening of the Guide for the band-shaped material 1.

Claims (9)

1. An adjustable guide for strip material (1) of variable width, comprising two lateral guide elements (2, 3) adapted to be positioned at a relative distance corresponding to the respective width of the strip, of which a first guide element is displaceable towards the second guide element or away therefrom, each guide element (2, 3) having a guide slot (14, 15) for the associated edge region of the strip material (1), the two guide slots (14, 15) pointing towards each other, and a sensor (28) being provided in the proximity of the guide slots (14, 15) to detect the strip material (1) and/or markings (33, 34, 35, 36) provided thereon, characterized in that the sensor (28) is attached to a sliding carriage (25) mounted so as to be displaceable over at least part of the width of the strip material (1), and that the sliding carriage (25) is displaceably mounted on one of the guide elements (3) that is adjustable.
2. The guide according to claim 1, characterized in that the guide elements (2, 3) are displaceable relative to each other by means of an adjusting spindle, and that the adjusting spindle (4) forms elements of a mechanism for both lateral guide elements (2, 3), wherein the second guide element (3) is adjustable by means of said mechanism relative to the first guide element (2) and at the same time as said first guide element, in such a way that both are moved towards each other or away from each other (12, 13).
3. The guide according to any one of the claims 1 or 2, characterized in that both guide elements (2, 3) are displaceable in a preferably common longitudinal guide (16).
4. The guide according to claim 3, characterized in that each lateral guide element (2, 3) has two preferably parallel sliding surfaces (19, 20) arranged in the spacing of guiding sides (17, 18) of a guide rail forming the longitudinal guide (16) for the guide elements (2, 3).
5. The guide according to any one of the claims 1 to 4, characterized in that the sensor (28) is displaceable from one of the guide slots (15) up to at least the center between the two guide slots (14, 15).
6. The guide according to any one of the claims 1 to 5, characterized in that the sliding carriage (25) is mounted for displacement on two guide rods (26, 27) which are parallel to the displacement direction (23) of the guide elements (2, 3) and which engage in, or extend through, bores of the two lateral guide elements (2, 3).
7. The guide according to any one of the claims 1 to 6, characterized in that the sensor (28) is arranged opposite a second sensor (32), said two sensors (28, 32) operating as forked light sensors.
8. The guide according to claim 7, characterized in that when the sliding carriage (25) is advanced, the second sensor (32) is switched off and the first sensor (28) is caused to operate as a reflex sensor.
9. The guide according to any one of the claims 7 or 8, characterized in that the sensor (28) is connected to a computer of a printer and the drive mechanism of the strip material (1) has a stepping motor whose steps are preset by the computer in the case of a section-by-section feeding of the strip, wherein the strip material (1) is a recording medium intended for printing.

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