FR2485845A2 - Electrical printing strip mfg. method - has sandwiched conductor track, shift register supports and reglet with register received in backing plate - Google Patents

Abstract

The printing strip has two sets of parallel conductor tracks on a supported film, the tracks comprising stylii at their ends in a longitudinal zone. An associated film carries a number of shift register chips (20). Each shift register comprises a communication element associated with the chip film and overlapping an edge region of the film, the mating faces of the element and film carrying interconnection tracks in number equal to those of the register chip control inputs to ensure that the relevant control inputs of the various chips are connected in parallel while the element carries those track positions connecting the register inputs to the strip terminals. The film and element are sandwiched and supported on an aluminium support provided with a longitudinal groove to receive the chips. The two edges of the groove are of different height to define on respective sides of the groove two zones where one is received relative to the other by the thickness of the element.

Description

Image printing bar and its manufacturing process
The present addition relates to the precise production of an image printing bar of the type described in the main patent application.

The printing bar which is the subject of the main patent allows all or nothing image printing on an electro-sensitive paper scanned by successive scanning lines. It comprises as many styli, isolated from each other and forming a stylus area, as there are image points entering each scanning line and a memory, of the shift register type, receiving data defining said image points and having parallel outputs for the individual control of said styli from the data received. This memory is constituted by 2 m pads with register stages each having a serial data input, n parallel outputs, a serial data output, and inputs control comprising a clock input command for shifting data from one stage to the next and two supply inputs defining two voltage levels corresponding to the levels of said data, m and n being two integers such that the product 2 min is at least equal to the number of styli, carried by at least one film and mounted in series m by m to constitute two distinct shift registers each with inputs of the same kind as cell es of the pads and at min outputs connected in parallel, for at least part of them considered successive and then constituting the so-called useful parallel outputs of the pads of the register considered, respectively to styli of rows of the same parity in said zone of pens, that is to say the odd-numbered pens and the even-numbered pens in the area of the pens for each of said registers respectively, to ensure the simultaneous supply of said pens each by one said voltage levels according to the binary level of each of said data respectively present on said useful parallel outputs of said pads and respectively translating the individual commands of said styli to which they are connected.

In particular, with regard to the embodiments given in FIGS. 7, 9 and 10, in particular of the main patent application, in the bar, flat or not, and in this latter case having a portion of rounded surface at the level of the stylus area , the styli can be changed independently of the two shift registers formed by the pads with register stages. Under these conditions, the bar comprises two films on each of which are mounted m pads with register stages which are connected in series and whose outputs are respective useful parallels are reported at regular pitch substantially along the same longitudinal edge of the film in question, and an insulating support carrying two networks of conductive tracks whose first ends carry the respective styli and extend, at regular pitch for each network , in a longitudinal area of the support which forms said area of the styli while the second ends of the tracks of the two networks extend tend, also at regular pitch for each network, respectively in two other longitudinal zones of the support located on either side of said zone of the styli and are connected respectively for one and the other of the networks to the useful parallel outputs of the m pads of either of the films, the useful parallel outputs of the m pads of each film being at the same regular pitch as the second ends of the tracks of the network which are connected to them.

In these embodiments, two elastomeric interconnection strips with conductive zones are mounted and held in sandwich between the support and both of the films respectively at the second ends of the tracks and useful parallel outputs of the pads by interconnecting them respectively.

In the bar illustrated in the figures mentioned above of the main patent application, the styli are organized in two rows spaced from each other by an interval equal to the height of a scanning line, the styli of the 'one of the rows, carried by the first ends of the tracks of one of the networks, being positioned opposite the intervals between styli of the other row carried by the first ends of the tracks of the other network.

The present addition defines a precise organization of the various elements of the bar, with a simple assembly simultaneously realizing the suitable interconnections between elements and an equally simple disassembly.

The bar according to the present addition is characterized in that, for the constitution of each shift register, it comprises a strip associated with the film with m pads considered by presenting a terminal portion projecting from said film, one of the faces belonging to the strip and to the film respectively and intended to be applied one against the other carrying conductive tracks called interconnection tracks, in number at least equal to that of the control inputs of each of the m pads to ensure the respective paralleling of the inputs of control of the same type of these m pads while the terminal portion of the strip also carries portions of conductive tracks, to bring the inputs of the shift register formed towards the outside of the bar, and a support called shift register support on which the film and the strip, sandwiched, are mounted, having on one side a longitudinal groove for receiving the pellets projecting from this side of the film and the two edges of which are at different levels and define on this face, on either side of the groove, two zones, one of which is set back from the other substantially from the 'thickness of the strip and is of width substantially equal to that of this strip to receive it.

The bar will be described in more detail with reference to the accompanying drawings illustrating it. In these drawings - Figure 1 shows an exploded view of a half-bar, - Figure 2 shows certain elements entering the bar for the constitution of one of the shift registers, - Figure 3 is a variant given with respect to Figure 2, - Figure 4 relates to another variant given with respect to Figure 2, - Figure 5 shows an end view of a bar, - Figure 6 is a cross-sectional view of the half-bar according to Figure 1 and of the type of that of Figure 5.

In Figure 1, one half of the bar has been illustrated and simply the other half roughly similar to that illustrated. The half-bar illustrated comprises an insulating support 1 carrying on one of these faces a network of conductive tracks 10. First ends of the tracks 10 respectively carry styli 11 extending in regular pitch, in a row, along the length support 1.

This support 1 is advantageously constituted by a film, one face of which is printed for the formation of tracks 10 and styli 11. This film is mounted on a rigid auxiliary support 12, the unprinted face of the film being against this auxiliary support. This auxiliary support, for example made of aluminum treated by anodic oxidation and having the form of a plate or any other suitable shape while then having a rounded surface in particular at the stylets 11, has simply been sketched in this FIG. 1 so as to render visible, by inverting the support 1, the tracks 10 and their respective styli 11 and the blank made of the other half of the bar. Thus we see, for the other half of the bar, that this support 1 relates to the same face a second network of conductive tracks 10 'whose first ends respectively carry styli 11'. These styli 11 are at the same regular pitch as the styli 11 and form another row of styli parallel to the previous one and defining with it a longitudinal zone on the support 1, called the styli zone.

The second ends of tracks 10 and 10 ′ of the two networks are located, for both of the two networks, on either side of the stylus area, in the vicinity of one and the other of the two longitudinal edges of the support 1, respectively. In each of the networks, the tracks here are parallel to each other.

The two rows of styli 11 and 11 ′ are separated by an isolation line of height chosen equal to that of a scan line of the printing paper. The pens of one row are arranged opposite the intervals between the pens of the other row. In each of these rows, the styli are at the double step of the definition step of the image points along each scan line, and the set of the two rows comprises as many styli as there are image points in each scan line.

On either side of the stylus area, and in the vicinity of this area, two insulating strips, not shown for the clarity of this figure 1, are arranged on the conductive tracks 10 and 10 ′ of the two networks respectively, these two insulating strips are intended to ensure the isolation of tracks 10 and 10 'and of electro-sensitive type paper when the latter is scanned by the bar.

The half-bar illustrated also includes a film 2 carrying m pads with identical register stages, 20, aligned along the length of the film 2. Each of these m pads 20 has a serial input e of information, a serial output s of information, n parallel register outputs, also more concisely termed, parallel outputs and control inputs consisting of two power supply inputs V1 and V2, a clock input H and an input b for inhibiting parallel register outputs . The numbers m and n are such that the product m.n is at least equal to the number of styli in the half bar.

The location of the inputs e, V1, V2, H, b and of the serial output s of each pad was transferred to the ends of conductive tracks and was not carried out on the same pad so as not to create excessive overloads at single pellet level; however, parallel register outputs were not indicated, for these same reasons.

The register outputs in parallel of the pellets are brought to the same longitudinal edge of the film 2, by conductive tracks such as 21 traced on one of the faces of the film 2. These tracks 21 pass through a longitudinal zone 22 of this face of the film , in which they are with the regular pitch of the tracks 10 printed on the support 1, here equal to twice the pitch of definition of the image points along a scanning line. The other longitudinal edge of the film 2 is regularly notched, a notch 23 being formed between two successive pads. The inputs e, V1, V2, H, b and the series output s of each of the pads are brought back by conductive tracks such as 24 on the edges closest to the adjacent notches; as illustrated, the inputs H, V1 and e of a patch are brought to the same edge closest to one of the two notches adjacent to this patch and the inputs V2 and b and the serial output s of this same patch on the edge closest to the other of these two notches. These conductive tracks 24 overlap the corresponding notch. In each notch, the serial output s and the input e which are brought there are opposite, the other inputs H, V1, V2 and b are at different heights on the edges of each notch and do not correspond not between them nor with the serial output s or the input e. The similar inputs of the different pads, considered brought back on the edges of the various notches, are aligned on the same longitudinal row, so there are as many alignments as there are types of inputs, the inputs e and the outputs being aligned with each other. Considering the organization given above, it will be noted that the inputs e, V1 and H of the patch at one of the ends of the film are brought to the lateral edge of the film which at this level has only one half-notch the inputs V2 and b and the series output s of the patch at the other end of the film are similarly brought to the lateral edge of the film having at this level only a half-notch also.

Thus all the tracks 22 and 24 traced on the same face of the film 2 form m identical patterns associated respectively with the m pads.

The pellets with register stages are mounted on the film 2 according to the phase, known as transfer on ribbon (ILB) of an automatic mounting process (TAB). They are respectively arranged in windows 25 cut for this purpose in the film 2 and protrude from these windows on the side of the unprinted face of the film 2. Each patch is covered with a drop of protective varnish, not shown in this figure 1 , deposited on the side not projecting from the window, that is to say on the printed side of the film side 2.

The half-bar illustrated comprises, in addition, a strip 3 for interconnection of the pads carried by the film 2 so as to form a shift register with min. Outputs in parallel and an elastomer interconnection strip 4 with conductive zones for the respective connections of the register outputs in parallel with the pellets of the film 2, with regard to at least part of these outputs, called useful, and tracks 10 formed on the support 1. By way of example, it is indicated that m is equal to 14 and n to 62, for scanning lines of 216 mm length and each formed by 1728 image points, this corresponding to 864 useful parallel outputs of the m pads of the half-strip, the last four outputs of the last patch of the shift register formed not being used.

The strip 3 is made of insulating material. It carries on one of its faces, arranged facing the unprinted face of the film 2, conductive tracks such as 30 interconnection tracks arranged along four continuous lines intended to ensure the respective parallel connections of the inputs H, V1, V2 and b of the different pads when the strip 3 is applied against the film 2 and arranged in a fifth, discontinuous line, intended to ensure the connection of the serial output s of each pad with the input e of the next pad.

This strip 3 has on one of its longitudinal edges cutouts 31 for the passage of the pellets when the strip and the film 2 are applied one against the other. The fifth line formed by the tracks 30 on the strip 3 is made discontinuous by these cutouts 31, it thus corresponds to the series inputs and outputs s of the pellets, brought back into the notches 23 of the film 2 by being arranged along a line which cuts the lozenges.

In order to improve the electrical connections between the tracks 30 of the strip 3 and the various serial inputs and outputs of the pads, carried out above by pressing the strip 3 against the film 2, these serial inputs and outputs will be welded to the lines suitable formed by the tracks 30, the welds being carried out at the notches 23 of the film 2.

The strip 3 overflows on a lateral edge of the film 2 by a short portion. The end of this portion, referenced 33, is enlarged and carries five connection terminals 34 to which the five lines formed by the tracks 30 lead respectively. These connection terminals are intended to allow connections with an external control circuit and form the shift register control inputs constituted by all of the m pads interconnected by the tracks of the strip 3 as well as the serial loading input of the shift register constituted.

The elastomer interconnection strip 4 with conductive zones is sandwiched between the film 2 and the support 1, the printed faces of the film 2 and of the support 1 facing each other.

This strip 4, mounted at the level of the zone 22 of the film 2 and of an analogous zone 13 of the support 1 in which the tracks 10 are at the same pitch as the tracks 21, provides the respective interconnections between the register outputs in parallel useful of the pellets of the film 2 and the tracks 10 of the support 1. This interconnection strip 4 is arranged in a longitudinal guide window 40 of an auxiliary film 41, of the same thickness as the strip 4, positioned between the film 2 of the pads and support 1 of tracks 10 and styli 11.

One of the longitudinal edges of this auxiliary film 41 extends at a line located between the zone 22 of the film 2 and the row of windows 25 where the pellets 20 are housed. The other longitudinal edge of this auxiliary film 41 protrudes from the longitudinal edge of the film 2, towards which the register outputs are brought in parallel with the pellets, it is approximately at the same level as the longitudinal edge of the support 1 where the ends of the tracks 10, free of styli, extend.

The strip 3 and the film 2 of the pads are mounted on a support 5 of the shift register. This support, made of aluminum treated by anodic oxidation and of the general shape of a rectangular plate, comprises, for housing the pellets 20 of the film 2, a longitudinal groove 50. This groove extends over the entire length of the support 5 and delimits on this support, on either side of it, two longitudinal zones referenced 51 and 52. The groove 50 has its two edges of different heights, the two zones 51 and 52 are therefore in separate planes, in the support 5 the part which presents the zone 51 being less thick than that which presents the zone 52, that is to say the zone 51 being set back with respect to the zone 52.

The difference between the planes of zones 51 and 52 is substantially equal to the thickness of the strip 3, increased by that of the tracks carried by this strip, which is arranged against zone 51 of the support.

The unprinted face of the strip 3 comes against the area 51. The longitudinal cut-out edge 31 of the strip 3 overhangs the groove 50 while the end 33 carrying the connection terminals 34 protrudes longitudinally from the support 5.

A self-sealing insulating sheet 53 is glued to the bottom of the groove 50; this sheet provides additional electrical insulation, the support 5 having been during its treatment covered with an insulating layer. A silicone grease, not shown in this FIG. 1, is deposited on the sheet 53 and in the groove 50, it serves to dissipate the heat given off by the pellets during operation.

The correct positioning of the strip 3 and of the film 2 and their maintenance on the support 5 are ensured by pins such as 54 and 55 inserted in the support 5. The pins 54 are regularly distributed in the support 5 according to a longitudinal row in the part which has the zone 51 and are, here, in a number equal to that of the pellets 20 of the film 2. These pins 54 protrude from the support 5 on the side of the groove 50 and are intended to come each engage in two guide holes 35 and 26 provided for this purpose in the strip 3 and the film 2 respectively. The holes 26 are arranged in the film 2 on a longitudinal row in the vicinity of the notched edge 23, each hole here being halfway between two successive notches.

The guide holes 35 are arranged in the strip 3 on a longitudinal row in the vicinity of the edge opposite to that having the cutouts 31. The pins 55 are regularly distributed in the support 5 in a longitudinal row in the part which presents the area 52 and are here in number equal to that of the pellets of the film 2. These pins 55 protrude from the support 5 on the side of the groove 50, each plumb with a pin 54. They are intended to engage respectively in guide holes 27 provided for this purpose in the film 2. These guide holes 27 are arranged in a longitudinal row in the vicinity of the edge towards which the register outputs are brought in parallel with the pads, between this edge and the zone 22.

In this mounting of the strip 3 and of the film 2 on the support 5, the unprinted face of the film, for the part extending substantially from the row of pads to the edge where the register outputs are brought in parallel, is placed directly against the area 52 of the support 5, the support and therefore this area 52 however protruding from this edge of the film 2. In this assembly, a film-hold 6 of thickness substantially equal to that of the film 2 increased by that of the tracks that carries this film 2 is provided and mounted in the extension of the film 2, on the side of the longitudinal edge where the register outputs are brought in parallel. This film-wedge 6 compensates for the difference in height between the longitudinal edges, at this level, of the support 5 of the shift register and of the film 2 of the pellets.

The support 5 with its pins 55 also ensures the correct positioning of the interconnection strip 4 mounted in the guide window of the auxiliary film 41. The ends of these pins 55, which protrude from the film 2 are intended to engage respectively in guide holes 42 provided for this purpose in the auxiliary film 41.

These guide holes 42 are arranged in a longitudinal row, substantially median. The pins 55 cooperating with the guide holes 27 of the film 2 and 42 of the auxiliary film 4f make it possible to position the interconnection strip 4 on the zone 22 of the film 2.

For reasons of proper centering, the auxiliary support 12 on which the support 1 for the styli is mounted is also provided with pins. These pins, not shown in Figure 1, are inserted in the auxiliary support 12, in the vicinity of its two lateral ends. The ends of these pins protrude from the face of the support 12 which receives the support 1 for the styli and are intended to engage respectively in guide holes 14 provided for this purpose in the support 1. These guide holes 14 are formed in the vicinity of each of the two lateral ends of the support 1.

These holes are advantageously of elongated shape while the corresponding pins are of circular section, they thus ensure precise longitudinal positioning of the support 1 on the auxiliary support 12, while leaving a slight lateral play possible, making removal easy.

Still for reasons of proper centering of the different elements, centering pins 15 are provided inserted in the auxiliary support 12. These pins 15 are distributed on a longitudinal row in the auxiliary support 12. They protrude from the side of the elements to be centered and are each intended to pass through a notch 16 formed for this purpose on the longitudinal edge considered for the half-bar of the support 1 of the styli and to be threaded into guide holes 43, 60 and 56 formed for this purpose in the auxiliary film 41 , the wedge film 6 and the shift register support 5, respectively. These pins and their guide holes are arranged so as to ensure the correct relative positioning of the support 5 carrying the strip 3, of the film 2 fitted with the pads and extended by the wedge film 6, of the auxiliary film 41 carrying the interconnection strip 4 and of the auxiliary support 12 carrying the support 1 equipped with styli and their supply tracks, for eff make the respective connections of the useful parallel register outputs of the pads 20 and the supply tracks 10 of the styli 11.

Finally, the assembly of the elements suitably positioned is ensured by means of screws such as 7. Each of these screws 7, which are mounted aligned with the pins 15, passes through holes 57, 61 and 44 provided for this purpose in the support 5 of shift register, the wedge film 6 and the auxiliary film 4, respectively, also passes through a notch 17 formed for this purpose on the corresponding longitudinal edge of the film 1 carrying the styli 11 and their supply tracks to be screwed into a threaded hole 18 formed in the auxiliary support 12.

The formation of notches 16 and 17 in the support 1 carrying the styli 11 and their tracks, rather than guide holes, advantageously allows the support 1 to be released from the pins 15 and the screws 7 without necessarily having to completely undo the assembly.

In this assembly, it will also be noted that the use of the auxiliary film 41 receiving the interconnection strip 4 and of the shim film 6 makes it possible to avoid crushing the interconnection strip 4 during the tightening of the screws 7.

In FIG. 2, the constitution of the shift register obtained by combining the film 2 carrying the pellets and the strip 3 mounted on the support 5 of the shift register, as described above with reference to the figure, has been illustrated. 1.

In this FIG. 2, the elements cited during the description of FIG. 1 bear the same references, an additional description of these elements is no longer given. We can clearly see the respective connections made at the notches 23 of the film 2 between the tracks of the strip 3, which '7courent "along the unprinted face of the film 2, and the various inputs and outputs of the pellets brought back to the level of the edges of these notches. We also see the film wedge 6 extending the film 2 on the side of the longitudinal edge where the register outputs are brought in parallel and allowing the passage of the centering pins and retaining screws in the holes 60 and 61 without damage or particular arrangement of the tracks carried by the film 2.

In Figure 3, there is illustrated with respect to Figure 2, therefore in Figure 1, a variant relating to the constitution of the shift register. In this variant, there are elements identical to those of FIGS. 2 and 1, namely the shift register support, the strip, the film-wedge, these elements and their visible distinctive parts are identified by the references used previously.

The constitution of this shift register differs from that of the register illustrated in FIGS. 1 and 2 essentially by the fact that the film carrying the pellets also designated by the general reference 2 is constituted by the association of m elementary films designated by 2 ′ each carrying a patch with register stages 20 and tracks 21 connected to the inputs and to the output of this patch.

These tracks 21 form on one of the faces of each elementary film 2 ′ a pattern substantially similar to those formed repeatedly on the single film of the pellets in FIGS. 1 and 2.

Each of these elementary films 2 ′ has a half-notch 23 ′ forming a recess on a portion of each of the two lateral edges of the elementary film considered; the inputs and the serial output of the patch carried by this elementary film are brought to the edges of one and the other of these two half-notches. Each elementary film carries a guide hole, not referenced, formed between the two half-notches, in the vicinity of the edge of this elementary film, in which is engaged a pin of the support 5, identical to the pin 54 of FIGS. 1 and 2 and of this fact bearing the same reference, crossing the slide 3. Each of the elementary films also has two guide holes, not referenced, in the vicinity of the edge towards which the register outputs are brought in parallel and in the vicinity of the two lateral edges respectively. . These two guide holes receive two pins 55 ′ and 55 "carried by the support 5.

These pins 54, 55 'and 55 "with the guide holes which correspond to them in the respective elementary films, ensure correct positioning of the elementary films 2' relative to each other and on the support 5 making the assembly technically equivalent to a unique film
The advantage of this embodiment is as follows: for a production of bars in series, the pellets intended for these bars are mounted, according to a phase, called transfer on tape (ILB) of an automatic mounting process (TAB), on a single film on which the tracks associated with the pellets and extended by test points are formed beforehand. The pellets are then tested individually, those detected as defective being identified. The single starting film is then cut so as to form the elementary films each carrying a pellet and its associated tracks, the elementary films bearing the identified pellets being eliminated.

A defective detected mounted tablet therefore only causes its own elimination, with that of the elementary film which carries it, whereas in the case of an embodiment corresponding to FIGS. 1 and 2, a defective detected detected tablet causes the elimination with it of other pellets carried by the same film, ie in total m pellets.

This variant also makes it possible to change the pellets of a bar formed independently of each other.

In FIG. 4 another alternative embodiment of the shift register is illustrated from the m pads; this variant relates essentially to the interconnections of the pads.

For this figure 4, only the differences compared to figure 2 are described below. The single film 2 on which the pads 20 are mounted is double-sided printed: the tracks 21 forming the register outputs in parallel, as well as the tracks connecting the serial output s of each pad to the input e of the next pad are printed on one side, while four tracks 21 ′, said interconnection tracks, are printed on the other side, in the vicinity of its longitudinal edge, here not indented, opposite the longitudinal edge towards which the register outputs are brought in. parallel.

These tracks 21 'are continuous and bypass the guide holes provided in the film, at the level of the pads respectively, to receive the pins 54; they are brought back at least on one side to the lateral edge of the film. The control inputs, V1 H, V2, b of each pad are slightly offset from the pad by means of tracks of very short length printed on the face carrying the tracks 21, and are connected through metallized holes respectively to the four tracks 21 'which thus ensure the respective paralleling of the control inputs of the same nature of the pastillesola m connection technique by metallized holes being as such known.

A strip 3 'of shape and size similar to strip 3 of Figure 2 is associated with the film, the face carrying the tracks 21' being applied against the strip 3 '. This strip 3 'carries on its portion projecting from the film 2, five tracks such as 30' printed on its face applied against the film 2 and extending into its enlarged end portion 33 'ending in connection terminals 34' for an external control and information input circuit.

These tracks 30 ′ are connected, by welding, respectively to the four tracks 21 ′ brought back on this side to the lateral edge of the film, and at the entry e of the adjacent patch, also brought back by a track printed on the face carrying the tracks 21 to this side edge.

In this variant, the number of connections to be made to the assembly between tracks of the strip and tracks of the film, the latter already ensuring the suitable paralleling of the control inputs of the same type of the pads and the placing in series of the pads, is reduced. at least.

In FIG. 5, an end view of a complete strip associated with the printing paper is illustrated, the strip having here in the part of the styli called the stylus area or printing area a rounded shape. In this figure, a distinction is made, for each half of the bar considered with regard to FIG. 1, the support 1 of the styli with its supply tracks, the area of the styli being designated by Z11, the auxiliary support 12 on which the support or film 1; this support defines the general shape of the bar, its central part is hollowed out here, it carries at its ends auxiliary parts for fixing in particular the external control circuit. It is also visible, mounted against the support 1, on each side outside, the two shift register supports 5 with, between each support 5 and the film 1, the strip whose terminal portion 33 is visible, the film 2 of the pellets extended by the film. wedge 6 and the support 41 of the strip interconnection between useful parallel register outputs and stylus supply tracks. The screws 7 secure the assembly. A dust cover is also provided; it is formed by two folded plates 8 which are mounted for the purpose of protection on each support 5 and extend to the vicinity of the zone of the styli Zll.

The paper marked at 9, engaged between two pairs of rollers 91, 92 and 93, 94 on either side of the bar, scrolls against the zone of the Zil styli under the action of the driving rollers 92 and 94, an auxiliary roller 90 at the area of the pens Zll now with the rollers preceding the paper in contact with this area Zll.

In Figure 6, there is illustrated a partial view, in cross section of the half-strip according to Figure 1 and in accordance with the type of strip of Figure 5, this section being made at a pellet. In this Figure 6, we see the assembled components, namely on the one hand the support 5 on which are centered by the pins 54 and 55 the strip 3, here cut at one of the cutouts 31, the film 2 with one of the pads 20 which it carries coming to be housed in the groove 50 of the support 5 and the film-wedge 6 extending it substantially to the level of the support 5, on the other hand the auxiliary support 12 on which is positioned by the pins marked in 19 the support 1 carrying the supply tracks 10 of the styli, and finally the interconnection strip 4 mounted in the window of the auxiliary film 41. The centering of the assembly is obtained by the pins 15 and its fixing by the screws 7 mounted in the tapped holes 18.

In this figure 6, we also see in the groove 50 of the support 5 the insulating sheet 53 glued on its bottom and the silicone grease identified here at 59 which is deposited there to dissipate the heat given off by the pellet. Also shown at 29 is the drop of protective varnish which covers the face of each patch 20, opposite to that inside the groove 50 of the support 5.

In order to show the various tracks printed on the strip 3, the film 2 and the support 1, these tracks have been shown housed in these elements; in practice, they are printed directly on their respective faces.

In FIG. 1 in particular, only a part of the elements belonging to the complete strip which in fact comprises, associated with the network of supply tracks 10 ′ of the styli 11 ′, have been illustrated, an arrangement similar to that associated with the tracks 10 and styli 11, that is to say involving, as arising from FIG. 5, a second shift register mounted on a second support and whose useful parallel register outputs are connected to the tracks 10 ′ by another strip d 'interconnection. Preferably in a complete strip produced, the two films 2 carrying the pads with register stages will be equipped identically (and not symmetrically). Therefore, the faces of the two films 2 carrying the tracks to be connected to those of the support 1 being turned towards one another and oriented identically in the bar mounted of the type of FIG. 5 or turned on the same side in a flat bar where the films 2 will be mounted head to tail, at the first patch of one of the shift register corresponds, opposite, the last patch of the other shift register, this to the shift equal to the step of definition of the image points of a scanning line near.

This implies that the serial inputs of the two shift registers one receive the data defining the image points of rows of the same parity along a scan line in the order corresponding to increasing rows and the other the data defining the image points of rows of the other parity of a scanning line in the order corresponding to decreasing rows. For this purpose, the external control circuit of the bar, not illustrated here, called control logic assembly and a particular embodiment of which has been given in the main patent, will be produced with buffer memories each consisting not of a shift register as in the aforementioned mode but of a random access memory activated alternately during loading that is to say in writing and in unloading, that is to say in reading and associated with a counter or an up-to-date counter adequately initialized and making it possible to read in the desired order the data previously entered es.

During the operation of the bar, it will also be noted, with regard to the absence of control reset input for the pads with register stages, that the outputs of registers in parallel with these pads are inhibited not only during the operation of changing the two shift registers formed by these pads but also during the operation of advancing one step of the paper, relative to the bar. The inhibition control signal can be easily obtained in the control circuit given in the main patent, for example at the output of a monostable connected through an inverter to the output of the counter by 1728 of data discharged from that of the two offload input buffers for 1728 image points per scan line. In this case, each falling edge of the output signal from the inverter would put the output signal of this monostable at zero level for a predetermined duration during which the image dot recording operation would be carried out.

The production of the bar has been described with reference to the figures given in the drawing. it is obvious that these figures have been given by way of example and that modifications of detail can be made thereto without departing from the scope of the invention.

Claims (6)

1 / A printing strip according to claim 5 of the main patent in which an insulating support carries two networks of conductive tracks, the first ends of which carry, in the same longitudinal region of the support, styli for recording image points of rows of each of the parities along a scan line for both of the two networks of tracks respectively while the second ends of the tracks extend for both networks, on either side of this area called the stylus area and are at regular pitch, two films on each of which are mounted m pads with register stages, each with a serial input and a serial data output, n outputs in parallel and control inputs, which are connected in series to form a shift register and whose parallel outputs are brought to the same longitudinal edge of the film while being at a regular pitch from the second ends of the tracks of the two networks, and two elastomer interconnection bands with conductive zones mounted and sandwiched between the support and one and the other of the films respectively by interconnecting the outputs in parallel with the pellets, for at least part of these outputs, called useful, at the second ends of the tracks of the two networks respectively, characterized in that, for the constitution of each shift register, it comprises a strip associated with the film with m pads considered by presenting a terminal portion projecting from said film, one of the faces belonging to the strip and film respectively and intended to be applied one against the other carrying conductive tracks called interconnection tracks, in number at least equal to that of the control inputs of each of the m pads to ensure the respective parallels similar control inputs of these m pads while the terminal portion of the strip also carries portions of tracks conductive in order to bring the inputs of the shift register formed towards the outside of the bar, and a support called the shift register support on which the film and the strip, sandwiched, are mounted, having on one side a longitudinal groove for receive the pellets projecting from this side of the film and the two edges of which are at different levels and define on this face, on either side of the groove, two zones, one of which is set back from the other substantially of the thickness of the strip and is of width substantially equal to that of this strip to receive it. 2 / strip according to claim 1 wherein each strip is printed on its length and carries the interconnection tracks and the portions of tracks on its face applied against the film with which it is associated, characterized in that each of the two films of the m pellets is notched on its longitudinal edge opposite to that towards which the outputs are brought in parallel with the pellets, notches being formed between successive pellets respectively, and present on its face opposite to that applied against the strip which is associated with it, in addition to tracks conductive bringing the outputs in parallel towards its longitudinal edge considered, other tracks bringing the serial input, the serial output and the control inputs of each pad respectively on the neighboring edges of the two notches adjacent to the pad considered for their electrical connections respective with the tracks of the associated strip. 3 / bar according to one of claims 1 and 2, characterized in that the bottom of the longitudinal groove of each shift register support comprises a silicone grease, to dissipate the heat given off by the pellets which are housed therein . 4 / bar according to one of claims 1 to 3, characterized in that each shifted deregister support projects beyond the film of the m pellets which it carries on the edge of the film towards which the outputs are brought in parallel with the pellets and which 'it includes a filmcale associated with each film of the m pads to extend it to allow mounting and fixing of the corresponding support of shift register formed on the support carrying the two networks of tracks and their respective styli. 5 / strip according to one of claims 1 to 4, characterized in that said two elastomeric interconnection strips with conductive zones are mounted in two longitudinal windows of two auxiliary films respectively, substantially the same thickness as them, arranged in sandwich between one and the other of the films of the m pellets respectively and the support, at the level of the outputs in parallel of the pellets and of one and the other of said arrays of tracks, respectively. 6 / bar according to one of claims 2 to 5, characterized in that each of the two films of the m pellets is constituted by m elementary films each with a single pellet, mounted side by side, with the associated strip sandwiched on the corresponding shift register support.