DE2364783C3 - Transport device for form-fitting and force-fitting guidance of perforated material webs in a printer - Google Patents

Description

The invention relates to a transport device for form-fitting and force-fitting guidance of perforated edges Material webs, in particular paper webs, in a printer, between a drivable endless line men on which a cross transport pins are arranged in the edge holes of the material web, and one in the guide area of the material web on the belt adjacent endless pressure element, which is with in the same The same spacing as the transport pins on the belt has neat holes for engaging the transport pins is provided.

Such a transport device is known from DT-OS 21 37 975 for example. At this bc Known paper feed device so-called tractors are used, which are provided with pens! Belt included and driven. Sin <in front of the actual printing device with their Abutment and after this printing device each arranged a pair of such tractors, so that the paper The web is guided in the perforations on both sides both in front of and behind the printing device. Dami the paper is held on the pens, each individual tractor is an endless pressure element in shape a moving cover belt opposite angeord net, which is at the same distance as the transport pin te of the belt is provided with holes for engaging the transport pins. By diesel Cover belt, the paper is pressed onto the belt and the pins.

In this known device the paper is in the area of the printing device, i. H. between the vo and after the printing line existing tractor pairs are not necessarily performed. For this reason it is ii in practice it is always necessary that the part de

Printing device that lies in front of the tractors and the paper web and onto which the pins of the tractor belts to be folded away when inserting a new material tray or when removing a paper jam have to. For this purpose, each individual cover belt serving as an endless pressure element must continue to be foldable be suspended from a device. To get a new web of material on all four tractors at the same time correctly, all four cover straps have to be folded away from the individual tractors and, moreover, the part of the printing device lying in front of the material web. After that the cover belts are to be put back onto the tractors and the swiveled-away part of the pressure device is to be spent again in the printing position.

It is obvious that in practice this requires a considerable amount of time for the operator and that the mechanical effort is still considerable.

The object of the present invention is to overcome these disadvantages of the known transport device in Avoid printers and the perforated material web through the entire transport device, d. H. also in particular across the pressure area and in this area itself positively and non-positively respectively. Furthermore, the previously necessary pivoting of parts of the printing device should be dispensed with as well as the insertion and introduction of new material webs are significantly simplified.

This object is achieved in the transport device of the type mentioned in that the Pressure element is designed as a driven transport ring that the pin belt is guided over deflection means is and the transport ring in the engagement area wraps partially, and that the printing device in the Engagement area of the belt and transport ring is arranged.

With the help of this transport device designed in this way, it is advantageously possible that the paper is forcibly guided from the inlet area of the transport device to its output. the The printing device is located in the transport area itself and can, through the forced guidance of the paper, which is guided between the belt and the dome rotating, driven transport ring, completely be arranged stationary. With this type of paper guide, there is a very safe feed option, which saves time and effort.

According to an advantageous embodiment of the transport device according to the invention, the wraps around the Belt the transport ring at more than 90 and less than 180 degrees, preferably at about 120 degrees.

In the case of the transport device, the endless belt is taken along and driven by the transport ring. According to one embodiment of the invention, the transport ring can be driven by that the transport ring is provided with internal teeth and is driven by a pinion. According to another, particularly advantageous embodiment of the transport device is to drive the Transport ring this give away with magnetic, radially arranged slats are within the Transport ring arranged at least three ring segment-shaped fixed stepping magnets, the are also provided with lamellas, which under each other '' p have the same distance as the slats of the transport ring, and the stepping magnetc respectively offset from one another by Vi of the lamella spacing.

During operation, the paper is drawn into the transport device from bottom to top and again after being guided by the transport ring and the belt, it is essentially delivered downwards. According to an advantageous embodiment that simplifies operation when inserting a new material web is used, a slotted material web insertion rail is provided, which can be pivoted through about 90 ° and is arranged such that it is in the material introduction position runs parallel to the belt, so that the edge holes of the material web from the pins of the moving Belt detected and advanced. In this introductory position it expediently shows the insertion rail towards the front of the printer where the operator is standing.

Further advantageous refinements and developments of the transport device are defined in the claims refer to.

The following is based on that shown in the figures Exemplary embodiment of the structure and the manner in which we operate the transport device explained in more detail. It shows

F i g. 1 is a side view of a printer with the transport device, partly in section and partly broken away,

F i g. 2 is a sectional view along the line 2-2 in FIG. 1 by t-inen stepping magnet,

F i g. 3 is a sectional view taken along the line 3-3 in FIG. 2,

F i g. 4 shows, on an enlarged scale, details of the FIG. 1 with 4 designated section and

F i g. 5 three detectors and their position in relation to the slats of the transport ring.

In Fig. 1 is a side view, essentially schematic, with parts in section and parts partially broken away, a printer shown in which the transport device is built in. The printer contains a stable rear wall 1 to which a cover 3 is attached and the facing a door 5 on the other side of the printer. The lid 3 and the door 5 can be made be made of transparent material so that the operator can see the inside of the machine is. To gain access to the transport device, especially when inserting a new material web open door 5 from the front of the printer. The material web is also made from this side newly inserted.

The printer also contains frame parts 6, of which in FIG. 1 only one is shown. Between these Frame parts 6 are fastened to two supports 7 and 9, on which plates 11 rest. On the board 11, of which there is one on each side of the material web in the printer, is on the respective inside a feed unit 13, designed according to the invention, arranged. The feed unit 13 is on Guide rods 15 and 17 can be displaced transversely to the transport direction of the material web, so that the feed unit can be adapted to different web widths.

The printer shown in FIG. 1 further includes a printing device, this printing device comprises a hammer unit 19, several hammers 21 arranged transversely to the transport direction and one Pressure chain 23, which is guided over sprockets 24. The individual print characters 77 are on the print chain 23 arranged, which by means of the hammers 21 operated at certain times and in certain places on the Paper are printable. For this purpose, a ribbon 25 is also provided that between the paper and the

Print chain runs through. The ink ribbon 25 is unwound from a reel 27 and onto a reel 29 wound up. The ribbons and the print chain can be attached to a holder 31, which in turn is attached to the frame parts 6.

In the board 11 or in the two boards 11, the Are arranged on both sides of the web of material, recesses 33 are attached, which are so large that the Board 11 on the guide rods 15 and 17, and the supports 7 and 9 across to the transport direction the hammer unit 19 and the print chain assembly 23 and the ribbon reels 27 and 29 moved can be. This is because the printing chain and hammer unit are usually used in a printer must be sufficient for the largest web width. However, a paper web width is often used which is smaller than the largest. This makes the printer more flexible to use overall. On the other hand, through it a shift of the feed units 13 transversely to the feed direction and over hammer and Chains and ribbon arrangement necessary. This is made possible by the cutout 33 in the pialine U.

The feed unit 13, which is arranged on the board 11 is, contains a belt 35, with transport pins 36. This pin belt 35 is over rollers 37,39, 41 and 43 and guided over a transport ring 70. Between the rollers 37, 39, 41 and 43, the belt 35 each essentially straight. Between the rollers 43 and 37, however, the pin belt 35 is pressed by the transport ring 70 inward, so that the wrap angle of the belt by one or both of these rollers 37.43 is greater than 90 ".

To make it easier to insert a paper web into the transport device, a material web insertion rail 45 is provided which is slotted and which is shown in the form shown in FIG. 1, shown in dash-dotted lines, which shows the insertion position, is guided parallel to the belt 35. This parallel guidance takes place between the two rollers 41 and 45 in such a way that the pins 36 can engage in the slot in the insertion rail 45 in this area. When a new paper web is inserted, the door 5 is opened and the paper to be inserted is picked up in the direction of arrow A from bottom to top by the operator and then inserted from right to left between the belt 35 and the insertion rail 45. As soon as the pins 36 engage in the edge holes of the paper web 50, the paper is automatically drawn into the printer when the belt 36 is rotated and leaves the printer via a paper discharge rail 52 in the directions of the arrow B at the rear end of the printer downwards again. After the paper web 50 has been inserted, the insertion rail 45 is brought into a vertical position by a device 51, which is shown in FIG. 1 is shown in solid lines.

So that the paper web 50 during the insertion phase on the one hand around the curvature of the deflection roller 43 can be guided around and, on the other hand, to enable length compensation when pivoting the insertion rail 45, this is possible with a flexible, also slotted part 47 is provided, which is held in place in a fastening 49

The device 51, which is used to raise and lower the insertion rail 45, can as in FIG. 1 illustrated be a hydraulic, extendable device. This device 51 is attached to a nose 12 of the circuit board 11. Furthermore, the board 11 also contains a stop 46 which aligns the insertion rail 45 in a vertical position. The Vorrich Hing 51 and the insertion rail 45 are demnac with the feed unit 13 and the belt 35 so slidable. In operation, the paper web 50 runs vertically from bottom to top in the direction of the arrow / and is guided by the belt 35 with the pins 36 and the transport ring 70. The diameter of the transport ring 70 is much larger than that of the diameter

ίο Diameter of the pulleys 37, 38, 41, 43. The Rie men 35 wraps around the transport ring 70 with about 120 " The paper web 50 is already in front of the printing device with the print hammer 21 Zwangsweisi between the belt 35 and the transport ring 7 (

'5 out and then to the Druckvorrich device, for example in the area of the guide rod 15, up to the pulley 37 it is positively and non-positively ge leads. The paper web 50 then leaves the transport device diagonally backward in the direction of arrow B , whereby it is diverted from the transport ring 70 by a paper discharge rail 5i.

In order to advance the transport ring 70, it can be provided with internal teeth, for example and be driven by a drive pinion

* 5 The in Fig. 1 and the other figures shown embodiment provides that on the Plati ne 11 three step solenoids 53a. 53Λ and 53c are provided inside the transport ring 70 and are arranged static när. These stepping solenoids 52

are designed in the shape of a ring segment and adapted to the shape of the ring accordingly.

On the basis of fig. 2, the sectional view along the line 2-2 in Fi g. 1, in the following the structure is a « these magnets, representing the others with, explained in more detail. The stepping solenoid 53a includes a permanent magnet 55 as a core. Around this permanent magnet there is an electric coil 57 in one Coil carrier 59 arranged. On both sides of the permanent magnet 55 and the upper and lower coil parts 57

two magnetically conductive flanges 61 and 63 are arranged. These flanges 61 and 63 are on that one Part facing the tractor ring 70, milled out so that there recesses 64 and web-shaped Lamellae 65 are present, as shown in FIG. 2 and 3

can be found. In these web areas, a continuous recess is also provided in the respective outer half of the two flanges 61 and 63, in which parts 67 made of plastic, for example, are attached. These parts 67, which are arranged on the outside of the stepping magnets 53, form the inner guide for the transport ring 70 and completely bridge the gaps between the individual stepping magnets 53a, 53b and 53c except for the area of the print hammers 21.

During the production of the stepping magnet 53, the individual web-shaped lamellae 65 are in the Flanges 61 and 63 and the parts 67. as well as the areas between the lamellas 65 expediently with poured out of a plastic. These plastic parts

between the individual webs are denoted by 64 and at the same time also form a cover for the upper part of the coil 57, as shown in FIG. 2 can be found. On the inner part, assigned to the flange € 3, the part 67 includes an extension 69 in the direction

towards the paper web 50. This creates a lateral Demarcation created.

The transport ring 70 is shown in the following on the basis of F i g. 2 to 4 explained in more detail in its structure. As the

Sectional view in FIG. 2 shows, the transport ring 70 consists of an outer steel ring 71 and, as in FIG. 3 clearly shows, of radially arranged at certain intervals lamellae 73. These lamellae 73 are made of magnetic material and are embedded in a Kunslstoffring 74th The transport ring 70 contains holes 75 in its components 71 and 74, the spacing of which corresponds to the spacing of the transport pins 36. These transport pins 36 engage in these holes and are carried along when the transport ring 70 rotates. Between the steel ring 71 of the transport ring 70 and the belt 35, as shown in FIG. 3 and 4 clearly show the paper web 50 guided in a form-fitting and force-fitting manner. The transport ring 70 is mounted on balls 72 which are arranged between the inner guide 67 with the running surface 68 of the transport ring 70 and the outer steel ring 71. The lateral guidance of the balls 72 takes place on the one hand through the plate 11 and / on the other on the opposite side through the extension 69 on the part 67, as in FIG. 2 shown. The ball is guided on the inside by the inner plastic ring 74, which is made narrower than the steel ring 71 of the transport ring 70.

The magnetic flux of the Sehritisehalt magnets 53 leading slats 65 have the same Absland. like the one in the inner plastic ring 74 of the transport ring 70 radially arranged lamellae 73.

As the F i g. 1 shows are three stepper magnets 53a. 53Λ and 53c are provided within the transport ring 70. These magnets are like this against each other offset that the web-shaped lamellae 65 of the magnets 53 each by a further third of the lamellae spacing are offset with respect to the slats 73 of the transport ring 70. This is done with the help of the permanent magnets 55 on the one hand ensures that the transport ring 70 with respect to the stepping magnets 53 always has a defined position and, on the other hand, ensures that when the stepping magnet is applied 53 a clear direction of rotation with incremental pulses in compliance with a certain sequence of the transport ring 70 is achieved.

In Fig. FIG. 4 is enlarged to that of FIG. 4 in FIG. 1 designated section shown. This is the area in which the print hammer 21 and the print chain 23 with the print types 77 and the ink ribbon 25 face each other. In this area it must be ensured that, on the one hand, the transport ring 70 is transverse to the transport direction A in FIG. 1 can be shifted through the hammer 21, and that the other of the transport ring 70 can rotate, without his fins 73. The most inwardly protruding into the ring, come into contact with the hammers 21st In this area a thin bridge 66 is provided for this purpose, which is incorporated or cast into the inner guide 67 and forms a stabilization for the ball running surface 68 between the thicker ends of the inner guide 67 on both sides of the hammer 21. Since in practice the stroke of the hammer 21 is relatively small, care must be taken that the tractor ring 70 with the lamellae 73 and the belt 35 and the paper web 50 guided between the two zwangsge is less than the existing hammer stroke.

The lamellas 73 of the transport ring 70 are m evenly spaced over the entire ring divides ver. In this case, however , no lamellae are provided in the areas in which the holes 75 are present. The lamellas present directly on both sides of a hole 75 are arranged at a distance which corresponds to an integral multiple of the lamellar spacing. The number of lamellae 65 present in each stepping magnet 53 is selected such that they overlap over at least one hole spacing, so that continuous operation and uniform drive of the transport ring is possible.

To determine the position of the transport ring 70 in relation to the Veryitisehaltmagnete 53 and to signals

ίο for the correct position control of the transport ring 70 to win are, as shown in FIG. 1, three detectors 81, 83 and 85 are provided. These detectors 81, 83 and 85 are in FIG. 5 in connection with three different positions of the transport ring 70 and its lamellae 73 shown again. The detectors of this embodiment contain three web-like Teeth which are arranged at a distance from the lamellae 73. According to the mutual displacement of the Slats 65 in the individual stepping magnets 53a. 53fr. 53c by V 3 of the lamella spacing opposite the slats 73 of the transport ring 70, the detectors 81, 83 and 85 are each to Vi the Land division shifted against each other. This has the consequence that, due to the influence of the permanent magnet 55, the slats 65 of one of these three magnets each directly opposite the slats 73 of the tractor ring stand, or vice versa. The same applies to the detectors 81, 83 or 85 in relation to the slats 73 of the transport ring 70. The FIG. 5 shows that the detector 81 the lamellas 73 of the top row, which is designated by I, face directly. At this point in time, this detector 81 then gives a pulse away. Stand in the middle row labeled Il then the lamellas 73 directly opposite the teeth of the detector 83 when the transport ring 70 is around Vj of the lamellar spacing was advanced so that this detector emits a pulse. Accordingly then stands the row of lamellae. which is denoted by Hl, with a further shift by Vj of the lamellar spacing the web-like teeth of the detector 85 opposite, so that this then emits a pulse. The so The pulses obtained are used on the one hand to determine the position of the transport ring and are used for others for the generation of suitable control pulses, which the stepping magnet 53a, 53 £>, 53c in certain Wise are supplied so that the transport ring 70 moves in the manner of a stepping motor and is rotated. With this rotation of the transport ring 70, the movement of the belt 35 and The transport of the paper web 50 is positively and non-positively connected.

It should now once again refer to FIG. 1 can be decreased. The in F i g. 1, shown in a side view, is arranged on a board H, as already stated. In a printer there are at least two such circuit boards 11 and, accordingly, two feed units 13. They are adjusted on the supports 7 and 9 and the guide rods 15 and 17 according to the width of the paper web. So that the paper web does not sag between two such feed units 13, approximately ring-shaped paper guides 79 are provided between these feed units. In their outer diameter, these paper guides 79 are adapted to the diameter of the transport ring 70. Like F i g. 1 shows these paper guides 79 are open in the area of the hammer 21 and have enough space inside for free displacement.
The transport device is used to

609 635/287

Have paper web 50 from the beginning of insertion η pressure range, in this and beyond the pressure range; h with the hammers 21 beyond / the belt 35 and the transport ring 70 form-I positively guided. This is advantageous achieved that no part of the printing device for inserting the paper into the transport device must be swiveled away and the required time for inserting new paper webs opposite be Known transport devices in the printer is significantly reduced.

For this purpose 2 sheets of drawings

Claims (12)

Patent claims: 1. Transport device for form-fitting and force-fitting guidance of perforated material webs, in particular paper webs, in a printer, between a drivable endless belt which are arranged in the edge holes of the material web engaging transport pins, and an im Guide area of the material web on the belt abutting endless pressure element, which is with im the same distance as the transport pins of the belt arranged holes for the engagement of the Transport pins is provided, characterized in that the Andr'ckelement a's driven Transport ring (70) is designed so that the pin belt (35) via deflection means (37, 39, 41, 43) is guided and partially wraps around the transport ring in the engagement area, and that the printing device (19, 21, 23) is arranged in the area of engagement of the belt and transport ring. 2. Transport device according to claim 1, characterized in that the belt (35) the Transport ring (70) wraps around with more than 90 and less than 180 °, preferably with about 120 °. 3. Transport device according to claim 1 or 2, characterized in that the transport ring (70) is provided with a toothing on the inside and can be driven via a pinion. 4. Transport device according to claim 1 or 2, characterized in that the transport ring (70) is provided with magnetic, radially arranged lamellae (73) that within the transport ring (70) at least three ring segment-shaped stationary stepping magnets (53a, 53Zj, 53c) are arranged, which are also provided with lamellae (65), which have the same distance between them as the lamellae (73) of the transport ring (70), and that the stepping magnets (53a, 53b, 53c) against each other by 1/3 of the lamellae spacing are offset. 5. Transport device according to claim 4, characterized in that the stepping magnets (53a. 536,53c) contain a permanent magnet (55). 6. Transport device according to claim 4 or 5, characterized in that at least three detectors (81, 83, 85) are provided that these detectors (81, 83, 85) against each other by Vi of the lamellae spacing are offset that they each emit a pulse when the slats (73) of the Transport ring (70) are exactly opposite the scanning means of the detectors (81, 83, 85), and that the pulses from the detectors (81, 83, 85) for determining the position of the transport ring (70) and for control the stepping magnets (53a, 536, 53c) are used. 7. Transport device according to claim 6, characterized in that the detectors (81, 83, 85) Magnetic detectors with several tooth-shaped ridges that are the same distance as the lamellae <*> have len (73) of the transport ring (70). 8. Transport device according to one of the preceding claims, characterized in that the transport ring (70) has an outer steel ring (71) and a narrower inner plastic ring (74), in which the lamellae (73) are cast in, and that the transport ring (70) is mounted on balls (72). the on a ring guide (67, 68, 69) on both sides of the inner plastic ring (74) and between the ovei the plastic ring (74) laterally protruding En of the steel ring (71) run. 9. Transport device according to claim 8, characterized in that in the area dtr pressure device (19, 21, 23) the ring guide (67, 68, 69 is bridged by a thin bridge (66). 10. Transport device according to one of the preceding claims, characterized in that a ge slotted material web insertion rail (45) is seen before, which can be pivoted by about 90 ° and derar is arranged. that it runs parallel to the belt (35) in the material introduction position, so dal the edge holes of the web (50) of the Stif th (36) of the moving belt (35) detected and before be pushed. 11. Transport device according to claim 10, characterized in that the slotted material track insertion rail (45) has a flexible part (47) in the vicinity of the transport ring (70) df r in turn is attached (49) in the vicinity of the transport ring (70). 12. Transport device according to one of the preceding claims, characterized in that the entire GE feed unit (13) is arranged on a board (U, which has a recess (33) and on supports (7, 9) and guides (15, 17 transversely to the feed direction (A) via the stationary! printing device (19, 21, 23) and further stationary units (27,29,31) is displaceable.