PASSBOOK PRINTER

Abstract: A passbook printer uses a conveyor belt (l6) to urge a passbook (86) towards a raised barrier (40) for the passbook (86) to strike the barrier (40) and then have one edge thereof aligned with the barrier (40) by sliding engagement with the conveyor belt (l6). After alignment, the barrier (40) is lowered and the pass­ book (86) is advanced beneath a printhead and sensor assembly (38) which senses the orientation of the pass­ book (86) and prints thereon in a correct and upright manner regardless of the orientation of the passbook (86).

Description: The present invention relates to a printing appar­ atus for use as part of a teller terminal in automatic bank­ ing equipment for printing a record of a banking transaction on a passbook for the information and retention of the bank­ ing customer. Modern banking practice includes the use of so-­ called teller terminals for use by individual bank tellers in communicating with a supervisory data processing system. As well as keyboard and display units, it has become the prac­ tice to include in teller terminals a printer for printing customer passbooks. When a passbook is printed, the teller opens the passbook at the latest page and indicates on the keypad which line of the passbook is next to be filled in. The opened pass­ book is then inserted into the passbook printer and the super­ vistory data processing system commands the passbook printer to print details on the open passbook at the indicated line according to information fed to the supervisory data proces­ sing system by the teller through his or her keypad. It is the custom in the design of passbook printers to provide a narrow slot wherethrough the opened passbook is fed by hand. This requires some precision of operation and can slow down the customer servicing rate of an individual teller. Further, because the passbook is fed through a narrow slot, there is a maximum thickness to the passbook which can be accommodated as well as a maximum height or length thereto, dependent upon the depth of the slot. Yet further, the pass­ book must be fed into the slot in a predetermined attitude or else the printer will not function and will print in the wrong place. It is, therefore, desirable to provide a passbook printer whereon no precision of position of the passbook is required prior to printing, where a thick passbook may be accommodated as well as a thin passbook and wherein correct printing of the passbook may proceed regardless of the attitude of provision of the passbook to the printer. The present invention consists in a printing system comprising a document and a printer, said document comprising first, second, third and fourth edges; said printer comprising a printhead movable along a path and a scanner operative to detect and to provide indication of which one of said first, second, third or fourth edges is a presented edge aligned parallel with the path of movement of said printhead; where said printhead is coupled to receive said indication from said scanner and is operative in response thereto to select an orientation of printing of characters on said document whereby characters printed on said document are always aligned with a predetermined one of said edges regardlessly of which of said edges is aligned with said path of movement of said printhead. In a preferred embodiment of the present invention a passbook printer is provided having a flat bed comprising a feed tray, a conveyor belt, a printing bed and a raisable barrier. An open passbook is placed upon the feed tray with a portion of the passbook resting on the conveyor belt. The pass­ book printer is activated and responds by raising the barrier across the flat bed. The barrier is provided in the vicinity of the printing bed. The passbook printer then activates the conveyor belt which draws the passbook from the feed tray towards the barrier. The passbook collides with the barrier and by sliding engagement with the conveyor belt one of the passbook's edges is aligned with the barrier. After the con­ veyor belt has been running for a predetermined time, suffic­ ient to achieve the above action, the conveyor belt is switched off and the barrier is lowered out of the plane of the flat bed. The passbook printer comprises a transport appar­ atus consisting in two spaced pairs of drive rollers in the flat bed, together with a set of lowerable clamp rollers. As soon as the barrier is lowered, the passbook printer lowers the clamp rollers onto the passbook to grip the pass­ book against the drive rollers. The drive rollers are advan­ ced by measurable increments, preferably using a stepping motor. All of the drive rollers move in concert from a com­ mon drive source. The drive rollers can be used to move the now aligned passbook a selectable distance to and fro on the flat bed. A printhead assembly lies behind the barrier and comprises a sensor and a matrix print head on a common belt driven by a common stepping motor transversely to the direct­ ion of movement wherein the transport apparatus is operable to move the passbook. The sensor is preferably an optical sensor. Having lowered the barrier, the drive rollers move the passbook forward a predetermined number of steps to lie beneath the printhead assembly. The passbook printer moves the sensor and printhead to a start position and thereafter sweeps the sensor across the passbook to detect where its edge begins. The printhead is a predetermined number of steps behind the sensor so that the passbook printer knows at all times thereafter where the printhead is relative to the edge of the passbook by means of counting the number of steps imparted to the printhead and sensor assembly. The passbook is provided with two kinds of pre-­ printing. The first type of pre-printing is made with thin lines and the second type with thick lines. The sensor is moved across the passbook. The thin lines keep the optical sensor dark for one or fewer steps. The matrix printer's own printing also keeps the reflected light to the sensor dark for one or fewer steps. By contrast, the second kind of pre-­ printing is in thick, bold type and keeps the light reflected into the sensor dark for four or more steps of the sensor across the passbook. In this way, the sensor can detect the mark. The passbook is provided with two dense marks such that one lies at the top and one at the bottom of one of the pages when the passbook is open. Dependent upon whether the sensor detects a mark far removed from the point where it first detects the edge of the passbook or detects a mark close to the point whereat it first detects the edge of the passbook, or detects two marks in its sweep across the passbook or detects no mark at all in its sweep across the passbook, so the sensor is able to detect which of the four possible edges of the passbook has become aligned with the barrier. The con­ trol characters from the character generator feeding the printhead matrix printer are accordingly swung around to accord with the appropriate direction of presentation of the passbook and the printhead and drive rollers controlled to print the desired row of characters in the passbook regardless of the orientation of the passbook. The invention is further explained by way of an example in the following description in conjunction with the appended drawings in which: Figure l shows a projected view of the lower half of the preferred embodiment of the present invention with cover removed. Figure 2 shows an elevated view of the preferred embodiment of Figure l from the opposite side to that shown in Figure l with the outline of the cover shown in phantom. Figure 3 shows a cross-sectional view of the entire apparatus of the preferred embodiment of the present invention taken along the line X-X′ of Figure l looking in the direction of the arrows. Figure 4 shows a view of the printhead assembly shown in Figure 3 and shown in phantom in Figure 2 looking in the direction of the arrow Y of Figure 3. Figures 5A to 5D show a plan view of the assembly of Figure l with the clamp roller assemblies removed showing how a passbook becomes aligned on the conveyor belt. Figure 6 shows detail of the printing of the pass­ book for use with the preferred embodiment of the present invention. Figures 7A to 7F are flowcharts indicating the man­ ner of operation of the preferred embodiment of the present invention. Figure l shows a projected view of the preferred embodiment of the present invention with cover removed. The preferred embodiment consists in a base l0 having a top there­ of, a flat bed l2 comprising a feed tray l4, a conveyor belt l6 and a printing bed l8. The base l0 is normally sunk into a recess on a support table up to a position indicated by a dotted line 20. It is to be understood that the base l0 can be sunk until the feed tray l4 becomes level with the supporting table to provide an extended feed area. Clamp roller assemblies 22 are rotatable about clamp rods 24 to form a first part of a passbook transport apparatus. The clamp rods 24 are shown by way of example as being rotatable by a solenoid 26 pulling on a bell crank 28 to rotate a first pulley 30 and thereby rotate a second pulley 32 through the medium of a connecting belt 34 for the second pulley 32 to rotate the clamp rod 24. Those skilled in the art will be aware of other means whereby the clamp rods 24 may be rotated. As will later become clear, only the leading clamp rod 24 nearer to the conveyor belt l6 need be rotatable, the clamp roller assemblies 22 on the transport apparatus remote from the conveyor belt l6 being usable in permanent engagement with their associated drive rollers. Figure 2 shows an elevation of the assembly of Figure l with a cover 36 and printhead assembly 38 shown in phantom outline. A barrier 40 is raisable between the clamp roller assemblies 22 in the printing bed l8. A first drive motor 42, a stepping motor, drives a first toothed belt 44 in common about drive roller pulleys 46 so that all four drive pulleys 46 move in concert. A second drive motor 48 drives the conveyor belt l6 and can range in its type from a stepping motor to a simple electical motor. Figure 3 shows a cross-sectional view of the com­ plete apparatus, the cross-section being taken through that part of the preferred embodiment indicated in Figure l by the line X-X′ looking in the direction of the arrows. The drive roller pulleys 46 rotate the drive rollers 50 as indicated. When the clamp roller assembly 22 most proximate to the conveyor belt l6 is lowered onto its associated drive rollers 50 it assumes the position shown for the clamp roller assembly 22 more distant from the con­ veyor belt l6. A bank passbook may be gripped between the clamp roller assembly 22 and its attendant drive rollers 50 to be advanced or withdrawn in the apparatus with precision by the stepping of the first drive motor 42. The barrier 40 can be raised by a simple second solenoid 52 returnable by means of a first spring 54. When the second solenoid 52 is energised, the barrier 40 is inter­ posed in the path of a passbook, as will later be described, beneath the printhead assembly 38. The preferred embodiment further comprises an electronic assembly 56 whose function in controlling the printhead assembly 38 and the various motors 42, 48 will be later described. A passbook introduced on the feed tray l4 onto the conveyor belt l6 may (after printing) either be returned from whence it came back onto the feed tray l4 by reverse action of the transport apparatus consisting in the clamp roller assem­ blies 22 and the drive rollers 50, together with possible reverse action of conveyor belt l6, or may be directed through one or other of a first rear aperture 58 or a second rear aperture 60 as indicated respectively by a first arrow 62 and a second arrow 64, by means of a deflecting blade 66 which may be raised into an upper position by a third solen­ oid 68 to allow the passbook to pass through the second rear aperture 60 or which can be, in absence of energisation of the third solenoid 68, be returned by a second spring 70 onto the flat bed l2 to divert the passbook up through the first rear aperture 58. As indicated by the second arrow 64, a pass­ book may also be inserted through the first rear aperture 58 to slide down the deflecting blade 66 to engage the transport apparatus 22,50 to be printed by the passbook printer. As will later become clear, for this to be effective the trans­ port apparatus 22,50 must transport the passbook right on to the conveyor belt l6 for the passbook to be treated thereafter in a conventional manner to be described hereafter. Figure 4 shows a view of the printhead assembly 38 of Figures 2 and 3 looking in the direction of the arrow Y in Figure 3. The printhead assembly 38 comprises a support yoke 72 for holding cog wheels 74 and stepping motor 76 respectively holding and driving a second toothed belt 78 transversely to the motion of the conveyor belt l6. The second toothed belt 78 supports a sensor 80 and a matrix printhead 82. The sensor 80 and the matrix printhead 82 are spaced apart by a known number of steps of the stepping motor 76. Thus, if the sensor 80 passes a point, the stepping motor 76 has only to step by the known predetermined number of steps to bring the matrix printhead 82 over the same point. The sensor 80 is a reflective optical sensor. This form of sensor is well known in the art. A focussed beam of light is sent out from a light emitting diode focussed onto a spot a predetermined distance in front of the sensor 80. A focussed photodetector also in the sensor 80 views the same spot whereat the light from the light emitting diode or other light source is focussed. When a target such as a piece of paper is placed at or near the focussed light area, the photo­ detector detects light and conducts current. The current is turned into a voltage by means of resistors, amplifiers and the like and can be turned into logic levels for control purposes by comparators. Printing on the paper causes the light from the light source in the sensor 80 to be momentarily obscured for the photodetector in the sensor 80 to detect a darkness condition. When no target paper is in the focussed light area, once again the sensor 80 detects a darkness con­ dition. Thus, as the sensor passes a paper surface it passes from detecting darkness to brightness as it encounters the paper surface and detects darkness at those points on the paper surface whereat printing of sufficient density is to found. The matrix printhead 82 is a conventional matrix printhead known in the art. The printhead comprises a plur­ ality of parallel needles each individually activatible to strike an ink ribbon against the item whereon printing is to be provided in a pattern making characters readable to a pass­ book user. At each step of the stepping motor 76 a different array of needles in the matrix printhead 82 is selected to make that particular portion of the character currently being printed as the matrix printhead 82 moves to and fro as indicated by the bi-directional arrow 84. It is known in the art to use as the array of dots making each printed character an array ninecharacters high by seven characters wide. An integrated circuit memory in the eletronic assembly 56 keeps a record of the patterns for each character and as each character is called out, the electronic assembly 56 drives through electronic switches and solenoids the indi­ vidual needles in the matrix printhead 82 to create the characters. As will later be described, the electronic assem­ bly 56 further possesses the ability to select one of four different sets of patterns dependent upon the detected orientation of a passbook in the passbook printer. Figure 5A shows a plan view of the apparatus of Figure l with the clamp roller assemblies 22 removed. The passbook 86 is placed upon the feed tray l4 and a portion of the passbook 86 urged to engage the conveyor belt l6. The operator of the passbook printer then provides indication that a printing operation is to be executed. The indication may be automatically by detection of the passbook 86 on the feed tray l4 or may be provided by switch or through commun­ ication through the teller's keypad. It does not matter from the point of view of the present invention how that indication is provided. In a first action, the passbook printer raises the barrier 40 through slots in the printing bed l8 of the flat bed l2. The barrier 40 lies across the path of the con­ veyor belt l6. Figure 5B shows the next stage of operation. The conveyor belt l6 is activated to drive the passbook 86 by frictional coupling in the direction of the third arrow 88 until a corner of the passbook 86 engages the raised barrier 40. Figure 5C shows the next stage in alignment of the passbook 86 against the barrier 40. The conveyor belt l6 con­ tinues to move after the corner of the passbook 86 has first engaged the barrier 40. Frictional coupling between the conveyor belt l6 and the passbook 86 causes the remaining portion of the passbook 86 which has not engaged the barrier 40 to swing round as indicated by the fourth curved arrow 90 to align one of the edges of the passbook 86 with the barrier 40. The conveyor belt l6 is maintained moving for a predetermined time at least equal to the amount of time required for the sequence of actions shown in Figures 5A to 5C. In practice, an excess allowance of time is provided so that the conse­ quences of inattentiveness or poor frictional coupling may be avoided. Figure 5D corresponds to Figure 5C except in that the passbook 86 has become aligned with the barrier 40 with a different edge of the passbook 86 in alignment with the barrier 40. This different situation is in consequence of the passbook 86 having been at a different angle on the feed tray l4 from that depicted in Figure 5A. It is to be appreciated that the passbook 86 if merely slid onto the feed tray l4 may end up with any one of its four edges aligned against the barrier 40. Whilst it is possible to detect alignments other than that shown in Figure 5C and not print the passbook 86, the present invention seeks to provide that the passbook 86 may be printed whatever the alignment thereof against the barrier 40. When the passbook 86 is aligned against the barrier 40, there is an uncertainty as to its transverse position on the conveyor belt l6. Accordingly, the sensor 80 on the printhead assembly 38 is employed not only to detect the orientation of the passbook 86, but also to detect the position of the passbook 86 transversely to the direction of movement of the conveyor belt l6. Once the passbook 86 has become aligned against the barrier 40 further movement of the conveyor belt l6 ceases. The barrier 40 is lowered. The passbook 86 is, there­ fore, able to continue in its progress across the printing bed l8. To facilitate this movement, the clamp roller assembly 22 closest to the conveyor belt l6 is lowered by rotation of its associated clamp rod 24 through action of the solenoid 26. The first drive motor 42 is activated to advance the passbook 86 a predetermined number of steps under the printhead assembly 38 for the printhead assembly 38 to commence a scanning operation. The printhead assembly 38 is first taken to its home position to one side of the passbook printer. The sensor 80 and the matrix printhead 82 are then moved together across the pass­ book 86. When the sensor 80 first detects reflected light it knows which step of the stepping motor 76 whereat the passbook 86 commences. Figure 6 shows details of the passbook 86. If the passbook 86 ends up with a first edge 92 thereof aligned against the barrier 40, the sensor 80 executes the line P-P′. The electronic assembly 56 starts a step count S of the stepping motor 76 whenever the photosensor 80 detects the edge of the passbook 86. The photosensor 80 detects no printing except that of a first dense mark 94. The first dense mark 94 takes the form of bold letter printing. The width of the printed lines are such that the photosensor in maintaining its count of the steps S detects darkness for four or more steps. Depending upon the thickness of the printing, this number can be changed according to the desire of the par­ ticular design. In the line P-P′ if the dense printing of the first dense mark 94 is not encountered before the step count S has exceeded a first predetermined count A, then it is a sure indication that the passbook 86 has been aligned with its first edge 92 up against the barrier 40. If the passbook 86 has been aligned with its second edge 96 against the barrier 40, the sensor 80 will execute the line T-T′ across the passbook 86. The ordinary printing on the passbook and previous printing by the matrix printhead 82 are of such a thickness that the sensor 80 does not see darkness for the requisite number of four steps. Accordingly, all ordinary printing upon the passbook 86 is ignored by the sensor 80. Thus, in executing the line T-T′ the sensor 80 sees no dense mark 94 whatever. In seeing no dense mark 94 in the totality of its possible excursion of steps S MAX the passbook printer may be certain that the pass­ book 86 has been aligned with its second edge 96 against the barrier 40. If the passbook 86 has been aligned with a third edge 98 against the barrier 40, then the sensor 80 executes the line Q-Q′ across the passbook 86. The passbook 86 is provided with a second dense mark l00 similar to the first dense mark 94 and immediately therebelow. The sensor 80, therefore, encounters two dense marks along the line Q-Q′. In detecting the two dense marks, the passbook printer may be sure that the third edge 98 of the passbook 86 was the one that came into alignment with the barrier 40. If the passbook 86 has been aligned with a fourth edge l02 against the barrier, then the sensor 80 executes the line R-R′ across the passbook 86. In so doing, it detects the second dense mark l00 very early in its execution of the line R-R′. In fact, it detects the second dense mark in less than a second predetermined number of steps W of the stepping motor 76 from the point where the sensor 80 first detected the edge of the passbook 86. When the passbook printer detects a dense mark less than the second predetermined number of steps W from the point whereat the sensor 80 first detected the edge of the passbook 86, it can be sure that the passbook 86 has become aligned with the fourth edge l02 thereof having been up against the barrier 40. In this manner, the passbook printer is able to detect which way round the passbook 86 has been aligned. Figure 7A shows a first portion of a flowchart indi­ cating the activities of the electronic assembly 56 in control­ ling the passbook printer. From a start operation l04, the electronic assembly 56 goes to a first operation l06 where it raises the barrier 40. Thereafter, the electronic assembly 56 performs a second operation l08 wherein the conveyor l6 is run for a predetermined number of seconds long enough to align the passbook 86 against the barrier 40. Thereafter, the electronic assembly 56 commands the second solenoid 52 to be de-energised for the first spring 54 to lower the barrier 40 in a third operation ll0. Thereafter, the electronic assembly 56 energises the solenoid 26 in a fourth operation ll2 for the clamp rollers 22 to grip the passbook 86 against the drive rollers 50. Finally, the electronic assembly 56 performs a fifth operation ll4 to advance the drive rollers 50 through a predetermined number M of steps of the first drive motor 42 to bring the passbook 86 into one of the positions rela­ tive to the sensor 80 indicated in Figure 6. Figure 7B shows further portions of the operation of the electronic assembly 56. Having advanced the passbook 86 the electronic assembly 56 performs a sixth operation ll6 to send the printhead assembly 82, 80 to its home position at the extreme lefthand side of Figure 4 as it is shown. This may be accomplished by stepping the stepping motor 76 until a microswitch (not shown) makes electrical contact or simply by stepping the stepping motor 76 for a predetermined period of time to make sure that enough steps have been administered to drive the assembly 80, 82 hard against its end stop. Having performed the sixth operation, the passbook printer through its electronic assembly 56 goes on to step the printhead assembly 80,82 across the passbook 86 in a seventh operation ll8. At each step, a first test l20 of the output of the sensor 80 is made to see if the sensor 80 has detected any light. If no light has been detected, a second test is performed to see if the printhead assembly 80,82 has gone through its extreme righthand position. If not, operation passes back to the seventh operation for another step to be administered to the printhead assembly 80,82. If the maximum excursion has been reached with no light having been detected, then no passbook 86 at all has been presented to the passbook printer and indication is provided before the printer shuts down. As soon as the sensor 80 detects light, the elec­ tronic assembly 56 starts counting the steps of the stepping motor 76 having first set the step count S equal to zero and also having set the count of the number of dense marks en­ countered M also equal to zero. The printhead assembly 80,82 continues to be stepped across the passbook 86 in a ninth operation l26 and its steps are counted. At each step a third test l28 is applied to see if the maximum number of steps S MAX has been reached. If the maximum number of steps S MAX has been reached, then the routine exits to the testing phase shown in Figure 7C. If not, a fourth test l30 is applied to test if the sensor 80 has seen darkness for four or more steps. If it has not seen such darkness, then the dense mark is not encountered and control is returned to the eighth operation l24. If it has encountered the dense mark 94,l00 then the dense mark count M is incremented by one and the value of the step count (S M ) whereat the dense mark was first encountered is noted down. All this is achieved in a tenth operation l32. Thereafter, the tenth operation l32 returns back to the eighth operation l24. It is to be appreciated that detection of the dense mark 94,l00 must be effected on the basis of its first encounter only. Those skilled in the art will appreciate that lettering and printing would otherwise interfere with the operation of this detection system by indicating the erroneous presence of many dense marks. Thus, only the first instance of a dense mark is recorded. Figure 7C shows the testing phase of the operat­ ional sequence shown in Figures 7A and 7B. If the third test l28 showed that the steps count S had equalled or exceeded the maximum step count S MAX , then control is trans­ ferred to a fifth test l34 which tests if the dense mark count M is equal to 0. If the dense mark count M is equal to 0, then the passbook 86 is aligned with the second edge 96 having been presented to the barrier 40. Control is, therefore, transferred to a second edge routine l36. If the fifth test l34 is not passed, control passes to sixth test l38. The sixth test l38 tests if the dense mark count M is equal to 2. If the dense mark count M is equal to 2, then the passbook 86 has been presented for the third edge 98 to have come into alignment with the barrier 40. The control is, therefore, passed to a third edge routine l40. If the sixth test l38 has not been passed, control passes to a seventh test l42. The seventh test l42 tests whether the number of steps of the step count S noted down on encountering the dense mark, namely S M exceeds the first predetermined number of steps A. If it does, then control is passed to a first edge routine l44. If not, then control pas­ ses to an eighth test l46. The eighth test l46 tests whether the noted down number of steps S M was less than or equal to a second predetermined number of steps W. If it is, then control is passed to a fourth edge routine l48. If not, then there is something wrong, namely a wrong kind of book or document having been presented to the passbook printer. Thus, control passes to an error routine l50 which indicates the error and prevents any further action. Figure 7D shows the first edge routine l44 of Figure 7C. In an eleventh operation l52 the electronic assembly 56 advances the drive rollers 50 by means of the first drive motor 42 to the selected line already indicated to the passbook printer by the teller using it. Thereafter, the electronic assembly 56 executes a twelfth operation l54 wherein the matrix printhead 82 is swept just once across the passbook 86 to print a normal row of upright characters. Thereafter, in a thirteenth operation l56 the drive rollers 50 are reversed as is the conveyor belt l6 to return the passbook 86 to the user. Thereafter, operation of the pass­ book printer ceases. Figure 7E shows the fourth edge routine l48 of Figure 7C. When the fourth edge l02 is presented to the printhead assembly 38 the book is effectively upside down. The electronic assemblies 56 perform a fourteenth operation l58 to advance the drive rollers 50 to move the book for the selected line to be beneath the printhead 82. However, it does not move the book the same distance as does the eleventh operation l52 since the book is upside down and must move a different number of steps of the first drive motor 42. In the fourteenth operation l58 the electronic assembly 56 moves the passbook 86 the required number of steps to bring the upside down desired line beneath the printhead 82. Thereafter the electronic assembly 56 performs a fifteenth operation l60 to print a single row of printing across the passbook 86, but with the matrix characters upside down with the characters from the control memory inverted such that the first row becomes the seventh row, the second row becomes the sixth row, and so on. Further, the directions left and right are changed so that the characters come out in the opposite sequence of printing. Having performed the fifteenth oper­ ation l60, the electronic assembly 56 reverses the drive rollers 50 and the conveyor belt l6 as for the thirteenth operation l56 in a sixteenth operation l62 to return the passbook 86 to the teller. Figure 7F shows the situation where either the second edge 96 or the third edge 98 have been aligned with the barrier 40. Thus, Figure 7F is equally applicable as being descriptive of the second edge routine l36 or the third edge routine l40 of Figure 7C. In a seventeenth operation l64 the electronic assembly 56 moves the printhead 82 to be in alignment with the desired line on the passbook 86 whereat the printing is required. It is to be remembered that in both these instances the passbook is sideways on the printhead 82. The elec­ tronic assembly 56, therefore, rescrambles the characters to be sent to the matrix printhead 82 such that the rows become columns and the columns become rows. To print a character now, instead of the normal fashion where a print­ head nine needles high is swept past seven printing positions to make a nine by seven character, in this instance the outermost two needles of the nine are disused and only the inner seven used, the printhead assembly 38 being swept through nine vertical print positions to create the charac­ ter. Thus, in an eighteenth operation l66, the printhead 82 first starts either at the top or bottom of the line to be printed and prints one character. Control is then passed to a nineteenth operation l68 wherein the electronic assembly 56 advances the drive rollers 50 to move the passbook 86 by one character width. Thereafter, in a twentieth operation l70 the next character in whichever order is required is presented for printing. If the line is not full, control is returned by a ninth test l72 to the eighteenth operation l66. If the line of printing is finished, then in a twenty-first operation l74 the drive rollers 50 and the conveyor belt l6 are reversed, once again to return the passbook 86 to the teller. It is to be appreciated that dependent upon whether Figure 7F is taken to be representative of the second edge routine l36 or the third edge routine l40, so the columns of the charac­ ters printed upon the line in the passbook 86 will be swapped or not so that the correct upright printing of a visual record is achieved within the passbook 86. The present invention is not restricted to banking passbooks, but may be used on any transactional document which may be printed upon presentation in a flat form to a printer.

Claims: 1. A printing system comprising a document and a printer, said document comprising first, second, third and fourth edges; said printer comprising a printhead movable along a path and a scanner operative to detect and to provide indication of which one of said first, second, third or fourth edges is a presented edge aligned parallel with the path of movement of said printhead; where said printhead is coupled to receive said indication from said scanner and is operative in response thereto to select an orientation of printing of characters on said document whereby characters printed on said document are always aligned with a predetermined one of said edges regardlessly of which one of said edges is aligned with said path of movement of said printhead. 2. A printing system according to Claim 1 wherein said document comprises a first mark proximate to the conjunction between said first and fourth edges and a second mark proximate to the conjunction between said third and fourth edges; and wherein said scanner is operative to scan said presented edge of said document to detect said marks and to detect the transverse position of said document; where, if a mark is detected more than a first predetermined distance from detection of said transverse position of said document and no other mark is detected whilst scanning said presented edge, said scanner is operative to provide indication that said presented edge is said first edge; where, if a mark is detected within a second predetermined distance from detection of said transverse position of said document and another mark is detected along said presented edge, said scanner is operative to provide indication that said fourth edge is said presented edge; where, if no mark at all is detected whilst scanning said presented edge, said scanner is operative to provide indication that said presented edge is said second edge, and where, if only one mark is detected whilst scanning said presented edge, within said second predetermined distance from detection of said transverse position of said document, but less than said first predetermined distance from said detection of said transverse position of said document, said scanner is operative to provide indication that said third edge is said presented edge. 3. A system according to Claim 2 wherein said scanner includes a photodetector; wherein said printer includes a printhead, movable along a fixed path, and wherein said photodetector is coupled to move with said printhead. 4. A system according to Claim 3 wherein said printhead is movable by incremental steps along said path, and wherein said scanner is operative to count said steps to measure said first and second predetermined distances. 5. A system according to Claim 3 or Claim 4 wherein said scanner is operative to detect a mark if a dark area is detected on said document for more than a predetermined number of incremental steps of said printhead/ 6. A system according to any of Claims 1 to 5 wherein said document is a passbook.

Inventors: DUPUIS, PIERRE, KERYHUEL, ALAIN
Applicants: UNISYS CORPORATION
Application year: 1985
Main classification: B41J11
IPC codes: G06K13, B41J13, G06K17, B41J11, B41J3