Background of the invention

[0001] The invention relates to an apparatus and a printing method, in particular in which a cutting device severs a printed document from a continuous strip and in which there is a stacking zone where several documents are stacked on one another.

[0002] Specifically but not exclusively, the invention may be used to form a stack or a group of documents (for example, tickets, vouchers, receipts, coupons, slips, etc) printed on a strip (unwound from a reel) and then separated from the strip, in particular for lottery or betting terminals.

[0003] The prior art comprises patent publication US 2005/0127594 that shows a cutting device having a movable blade that, whilst it cuts a ticket, pushes it sideways to a stacking zone above a fixed blade.

[0004] Patent publication US 2005/0226671 shows a unidirectional clutch that connects a paper-dragging roller to an oscillating rotating blade that, in the forward stroke, cuts a ticket, whereas, in the backward stroke, the roller advances the ticket to a stacking zone.

[0005] Patent publication US 2012/0272805 shows a printer in which the printed and cut document is pushed into the stacking zone by two bladed rotors arranged on the lateral edges of the document.

[0006] One of the problems of known printing apparatuses is obtaining the correct arrangement of the printed documents, placed on top of one another in an orderly manner, in the stacking zone. Another problem is to ensure the stability of the documents, which may fall from the stacking zone, especially for longer documents. It is also desirable to facilitate handling of the stack of documents, minimising the manual operations for the person removing the documents. It is also desirable to reduce the dimensions of known printing apparatuses with an automatic stacker.

Summary of the invention

[0007] One object of the invention is to make a printing apparatus that is able to remedy one or more of the aforesaid limits and drawbacks of the prior art.

[0008] One object of the invention is to disclose a printing method that is able to remedy one or more of the aforesaid limits and drawbacks.

[0009] One advantage is to provide a printing apparatus with an automatic device for stacking a plurality of printed documents. [0010] One advantage is to form stacks of printed documents (tickets, vouchers, receipts, coupons, slips, etc) at high speed.

[0011] One advantage is to facilitate the handling of a block of documents that are printed and stacked on one another.

[0012] One advantage is to minimise the manual operations required to remove a group of printed documents from a stacking zone.

[0013] One advantage is to ensure the correct arrangement of the printed documents, placed on top of one another in an orderly manner, in the stacking zone.

[0014] One advantage is to ensure the stability of the stacked documents, which may fall from the stacking zone, especially for longer documents.

[0015] One advantage is to enable a cover to be opened that contains the stacking zone preventing the documents from falling.

[0016] One advantage is to make available a printing apparatus with an automatic stacker of relatively reduced dimensions.

[0017] One advantage is to provide a printing apparatus with an automatic stacker that is constructionally simple and cheap.

[0018] Such objects and advantages, and still others, are achieved by the apparatus and by the method according to any one of the claims set out below.

[0019] In one example, a printing apparatus comprises a cutting device, which severs a printed document from a continuous strip of paper, and a shifting device, which moves the document sideways to a stacking zone according to a direction that is transverse to the document which, by passing above at least one protrusion, undergoes folding of at least one edge that, after the protrusion is passed, returns to a normal position owing to the elasticity of the paper. The return to the normal position may be promoted by a movable wall that presses the document, which has arrived at the stacked position, against the protrusion. The lateral wall can promote secure and reliable retaining of the documents in the stacked position without falling.

Brief description of the drawings

[0020] The invention can be better understood and implemented with reference to the attached drawings, which illustrate one embodiment thereof by way of non-limiting example.

[0021] Figure 1 is a section in a vertical elevation of one embodiment of a printing apparatus according to the invention. [0022] Figure 2 is a top view of the apparatus of figure 1 in a first operating configuration.

[0023] Figure 3 is the view of figure 2 in a second operating configuration.

[0024] Figure 4 is the view of figure 2 in a third operating configuration.

[0025] Figure 5 is a lateral view in a vertical elevation of a detail of the apparatus in figure 1 in the first operating configuration.

[0026] Figure 6 is the view of figure 5 in the second operating configuration.

[0027] Figure 7 is the view of figure 5 in the third operating configuration.

[0028] Figures 8 to 13 show, schematically, the operation of the apparatus in figure 1 in six different operating configurations.

[0029] Figures 14 to 17 show an operating mode of the apparatus in four different operating configurations.

Detailed description

[0030] With reference to the aforesaid figures, overall with 1 a printing apparatus has been indicated that is usable in particular for printing tickets, vouchers, receipts, coupons, slips, or other types of printed document in real time. The printing apparatus 1 may, in particular, be used in a lottery or betting terminal.

[0031] The printing apparatus 1 may comprise, in particular, a magazine for housing printing paper or another type of printing support. The printing support that is usable by the printing apparatus 1 in question may be, in particular, paper, for example thermal paper. In this patent document "paper" will be defined as any type of printing support that is suitable for printing (in particular with a thermal printing or inkjet printing head), for example a printable material in the shape of a strip, in particular wrapped in a reel, like a roll of (thermal) paper. In this patent document, "strip" will be defined not only as a strip of paper unwound from a reel but also as other types of printing supports (of known type), such as, for example, a set of sheets in a continuous fan-fold format, or a set of sheets (for example labels) arranged in a row on a support in the shape of a strip, etc.

[0032] In the specific case the magazine may comprise, in particular, at least one seat set up for receiving at least one reel B of (thermal) paper. The magazine may nevertheless comprise other types of paper magazine (also of known type).

[0033] The printing apparatus 1 may comprise, for example, a containing body or case, (for example box-shaped) that is suitable for containing the various components of the printing apparatus or at least a part thereof. [0034] The printing apparatus 1 may comprise, in particular, a path for feeding a continuous strip S of paper coming from the magazine (strip S unwound from a reel B) to a cutting zone of the printed document.

[0035] The printing apparatus 1 may comprise, in particular, a printing device for printing a document on the strip S of paper that advances (unwound from the reel B). The printing device may comprise, e. g., a (thermal) printing head 2 arranged along the path of the strip of paper for printing on at least a first side of the paper (for example a thermally sensitive side). In the specific case a thermal printing head is arranged, but it is possible to provide for the use of an inkjet printing device or still other type of printing device.

[0036] With the printing head 2 a printing roller 3 (paper-dragging roller) may be operationally associated that is counterpoised to the printing head 2. The printing roller 3 may operate in contact with a second side of the paper (opposite the first printable side). The path of the strip of paper passes, in particular, between the printing head 2 and the printing roller 3. The printing roller 3 may be controlled (by means of a programmable electronic controller) in cooperation with the printing head 2, to advance the strip in a coordinated manner during the step of printing the document.

[0037] The printing apparatus 1 may comprise, in particular, a cutting device 4 for separating the printed document 5 from the rest of the strip when the document 5 is (stationary) in a cutting position. The cutting device 4 may comprise, e. g., a movable driven blade cooperating with a stationary blade.

[0038] The printing apparatus 1 may comprise, in particular, a shifting device 6 for moving the document 5 (already separated from the rest of the strip) sideways. The document 5 may be moved, in particular, from the cutting position (figure 2 or figures 14- 16), to a stacking position (figure 4 or figure 17) in which two or more printed documents may be stacked on one another to be easily grasped and/or handled by a user. "Sideways" or "lateral" movement is defined as a movement in a transverse (for example substantially perpendicular) direction to the surface of the document. In particular a "sideways" or "lateral" movement may be a movement in a direction that is transverse to the normal advancement direction of the paper if the paper were dragged by dragging rollers.

[0039] The printing apparatus 1 may comprise, in particular, at least one first (fixed) protrusion 7 arranged for interacting in contact with at least one first lateral edge of the document 5 (for example the right edge or the left edge) when the shifting device 6 moves the document sideways from the cutting position to the stacking position. The "lateral" edge is defined as a (non-cut) edge of the document 5 that is transverse to a cut edge.

[0040] The first protrusion 7 may interact in such a manner that the first lateral edge (passing above the first protrusion 7) is folded in transit from the cutting position to the stacking position. By virtue of the elasticity of the paper, the first lateral edge may then have at least one partial elastic return when it arrives in the stacking position after passing the first protrusion 7.

[0041] The printing apparatus 1 may comprise, in particular, at least one second protrusion 7 (fixed, opposite the first protrusion) arranged for interacting in contact with a second lateral edge of the document (for example the left edge or the right edge), opposite the first lateral edge, when the shifting device 6 moves the document laterally from the cutting position to the stacking position.

[0042] The second protrusion 7 may interact with the document in such a manner that the second lateral edge is folded in transit from the cutting position to the stacking position. By virtue of the elasticity of the paper, the second lateral edge may have at least one partial elastic return when it arrives in the stacking position after passing the second protrusion 7.

[0043] In figures 2 to 4 the transit is shown of the document 5 from the cutting position (figure 2) to the stacking position (figure 4). In particular in figure 3 (intermediate transit position) the lateral edges of the document 5 are folded passing above the protrusions 7.

[0044] The printing apparatus 1 may comprise, in particular, at least one movable wall 9 that is arranged in the stacking zone to maintain the document situated in the stacking position pressed against the first protrusion 7 and/or the second protrusion 7. The stacking wall 9 may be, as in this specific example, fastened (for example to the casing or to another component of the printing apparatus) by two sliding lateral pins 10 (in particular with linear sliding).

[0045] In particular the stacking wall 9 may be arranged for retracting, pushed by the shifting device 6, when the latter moves the document sideways to the stacking position. The wall 9 may be arranged for returning (elastically) to a suitable position for maintaining the document pressed against the protrusion/s 7 when the shifting device 6 returns to the rest position ready for moving the next document sideways.

[0046] The wall 9 may be provided with elastic means (for example at least one coil spring 8 arranged between the wall 9 and the casing of the apparatus) that pushes the wall 9 against the protrusion/s 7. The elastic means may be arranged, for example, so as to operate in opposition to the sideways movement action performed by the shifting device 6.

[0047] The stacking wall 9 is, in particular, wider than the free space for the transit of paper comprised between the lateral protrusions 7, i.e. the gap left free in the centre between the two protrusions 7 and through which the document 5 passes from the cutting position to the stacking position.

[0048] The elastic means (spring 8) that presses on the stacking wall 9 may promote the return of the edges of the document to the normal position (not folded) when the document arrives in the stacking position after passing the protrusion/s 7. Thus the return of the edges to the non-folded position may be caused not only by the elasticity of the paper but also by the pressure exerted by the resilient means (spring 8) that presses the wall 9 on the document arriving at the stacking position.

[0049] The shifting device 6 may comprise, as in this example, at least one contact portion 11 arranged in contact on a side (printed previously by the printing device) of the document 5 to push the document in a direction that is transverse (perpendicular or tilted) to the document to perform the sideways movement. The contact portion 11 may define a (flat) surface that acts against a side of the document 5.

[0050] The contact portion 11 may operate, in particular, in a central zone of the side of the document comprised between the lateral edges thereof. The contact portion 11 may comprise, as in this example, two or more parallel bars that are spaced apart from one another. The bars may extend in length, in particular, in a direction parallel or almost parallel to the document 5 located in the cutting position. In particular the contact portion 1 1 may comprise one or more openings. The contact portion 11 may be made of plastics.

[0051] The contact portion 11 may be, as in this example, tilted with respect to the motion direction of the portion 11 so as to promote the detachment of the document 5 from the cutting device 4 after cutting.

[0052] The shifting device 6 may comprise, as in this example, at least one movable portion 12 (bearing the aforesaid contact portion 11) having a reciprocating motion with a forward stroke (when the document 5 is moved to the stacking position) and a return stroke (thereby the shifting device 6 can return to a position suitable for moving the next document). In particular, each movable portion 12 is slidable. Each movable portion 12 may form, substantially, a slide (with a linear sliding direction).

[0053] In particular the shifting device 6 may comprise, as in this example, two movable portions 12 arranged parallel alongside and spaced apart from one another. The two movable portions 12 are arranged on the (right and left) sides of the document 5 located in the cutting position. The contact portion 11 may be interposed between the two movable portions 12 and be connected (stiffly) to both the movable portions 12. The two movable portions 12 may be made of plastics.

[0054] It is possible that the thrust force of the contact portion 11 is perpendicular to the surface of the document 5 that is moved from the cutting position. It is possible to provide other examples in which the thrust force is tilted (for example by an angle comprised between 0° and 10°, or between 0° and 20°, or between 0° and 30°) with respect to the surface of the document 5 in the cutting position, with a tilt that is such that the thrust force has at least one component that moves the document away from the blade of the cutting device 4, so as to promote extracting of the document from the blade.

[0055] The printing apparatus 1 may comprise, as in this example, a mechanism for transferring a rotary (unidirectional) motion to the reciprocating motion of the movable portion/s 12. The transferring mechanism may comprise a slot-slider pair 13 and 14 to connect a rotating member 15 to a movable portion 12 of the shifting device 6.

[0056] The slot-slider pair may comprise, in particular, at least one slot 13 obtained in one movable portion 12. In the specific example, the slot-slider pair comprises, in particular, two slots 13 obtained in the two movable portions 12, i.e. a slot 13 for each movable portion 12.

[0057] The slot-slider pair may comprise, in particular, at least one slider 14 (for example in the form of a pin) arranged (eccentrically) on a rotating member 15. In the specific example the slot-slider pair comprises, in particular, two sliders 14 (pins) each coupled with a corresponding slot 13. The two sliders 14 may be arranged on two rotating members 15 each of which is operationally associated with a corresponding movable portion 12. The two rotating members 15 may be, as in this example, mounted on the same rotation axis 16. Each rotating member 15 may comprise, for example, a gear.

[0058] The transferring mechanism may comprise, e. g., a worm screw 17 coupled (coaxially) with a rotor of an (electric, for example stepping) motor 18. The worm screw 17 may be coupled, as in this example, with one of the two rotating members 15 (for example by meshing).

[0059] The motor 18 drives the shifting device 6 by the motion transferring mechanism, thereby the (unidirectional) rotation of the rotor of the motor 18 is transformed by the mechanism into the reciprocal movement of the shifting device 6. [0060] In particular the rotation by one revolution of the rotating member/s 15 is transformed into one single step (one forward stroke and one return stroke) of the reciprocal movement of the movable portion/s 12 of the shifting device 6 and of the contact portion 11 carried by the movable portion/s 12.

[0061] In the specific example the stacking wall 9 has, on two opposite sides, the two pins 10 (which are integral with the wall 9) that may be axially slidable within two respective slots 19. The two pins 10 are coaxial with one another, so the wall 9 can oscillate around the axis of the two pins 10. In the step of moving the document from the cutting position to the stacking position, the wall 9 is pushed by the shifting device 6 performing a movement, substantially a translation movement. During this movement the pins 10 slide (in the respective slots 19).

[0062] The contact portion 11 may be integrally connected to the two movable portions 12, for example by two respective arm portions 20. The contact portion 11, the two movable portions 12 and the two arm portions 20 may be, for example, integrated into a single piece (made of plastics).

[0063] In figures 5 to 7, with 21 a gear has been indicated that belongs to the drive mechanism of the printing roller 3.

[0064] In figures 8 to 13 some operating steps of the stacking means disclosed above are shown schematically. In figure 8, a document 5 is in a cutting position, whereas the stacking zone is empty of documents. In figure 9, the contact portion 11 is advanced as far as the stacking wall 9 (without yet moving the stacking wall 9), whilst the lateral edges of the document 5 have started to be folded by moving over the protrusions 7.

[0065] In figure 10, the contact portion 11 is advanced further, starting to move the stacking wall 9, whereas the lateral edges of the document 5 have continued to be folded further. In figure 11 , the contact portion 11 is advanced still further, so the lateral edges of the document 5 have passed the protrusions 7 and are returned elastically to a non-folded position.

[0066] In figure 12, the contact portion 11 is moved back as far as the initial position of figure 8 and the resilient means (spring 8) has moved the stacking wall 9 against the protrusions 7, so that the document 5 is retained in a stacking position between the wall 9 and the protrusions 7. In figure 13, the stacking means has transferred (one at a time) a plurality of printed documents in a stacking position to form a stack P of documents.

[0067] The printing apparatus 1 may comprise, in particular, a first drive (in particular an electric motor, for example a stepping motor) for driving the movable blade of the cutting device 4. The printing apparatus 1 may comprise, in particular, a second drive (the motor 18) for driving the shifting device 6.

[0068] In one embodiment that is not illustrated, the second drive may comprise a movable element of a linear actuator. This movable element may be connected (integrally) to the contact portion 1 1 (the movable portions 12 might no longer be present). The linear actuator may be driven electrically, for example. The linear actuator may comprise a solenoid or a coil. The movable element may comprise the movable nucleus of the solenoid.

[0069] The printing apparatus 1 may comprise, in particular, the aforesaid programmable electronic controller (comprising for example an electronic card connected to sensors and actuators of the printing apparatus) connected to the aforesaid drives.

[0070] The controller works in such a manner that after the printing apparatus 1 has printed a document 5, the first drive separates the document 5 (located in the cutting position) from the rest of the strip. After the document 5 has been separated (with the document 5 still located in the cutting position), the second drive (motor 18) moves, for example by means of the aforesaid motion transferring mechanism, the two movable portions 12 and consequently the contact portion 11, connected to the movable portions 12, that moves the document 5 from the cutting position to the stacking position.

[0071] The printing apparatus 1 may comprise, in particular, a cover that contains the stacking zone. In particular, the cover may include the movable stacking wall 9 (the wall 9 may be coupled with the cover) together with the elastic means (spring 8) that presses the wall 9. The cover may include the protrusions 7. The protrusions 7 may be fixed to the cover. The cover may be liftable. The cover may be hinged on the casing of the printing apparatus 1.

[0072] The printing apparatus 1 may comprise sensor indicating paper has finished (for example of known type) and an automatic cover-opening device. The controller may be programmed for opening the cover automatically when the sensor detects an end of paper situation. When the cover is opened, the stacked documents that may be present remain retained in the stacking zone, owing to the wall 9 that locks the documents in position, preventing the documents from falling.

[0073] The printing apparatus 1 may comprises, in particular, programme instructions that are implementable on this programmable controller to run the subsequent steps of a printing method.

[0074] A first step may comprise the step of printing (by means of the aforesaid printing device) the document on the advancing strip. A second step, following the first step, may comprise the step of separating (by means of the aforesaid cutting device) the document from the strip. A third step, following the second step, may comprise the step of moving the document to a stacking position. The step of moving may involve first folding one or two lateral edges of the document (during movement) and then an elastic return when they arrive at the stacking position in which they are retained in position by the stacking wall 9.

[0075] In the embodiment disclosed here, one or two opposite lateral edges of the document 5 are folded by passing over one or two lateral protrusions 7 and then return elastically to the normal position. It is possible for the aforesaid folding to occur (additionally or alternatively) on one or two non-lateral edges, for example on one or two cut edges (front edge and rear edge) of the document. In this case the protrusions that cause the folding of the edges of the document will be arranged, instead of on the right edge and/or on the left edge of the document, on the (cut) front edge or upper edge of the document and/or on the (cut) rear edge or lower edge of the document.

[0076] The protrusions 7 define, on one side, a seat for receiving the documents in the stacking position, in which the stacked documents are separated from the document located in the cutting position. Further, the protrusions 7 define, on the opposite side, a seat for receiving a single document in the cutting position. This document, isolated and separated from the stack of documents, can be processed (i.e. separated from the rest of the strip by cutting) in an appropriate manner without suffering interference from documents already transferred previously to the stacking zone.

[0077] Further, the stacking wall 9 can maintain the documents locked securely in the stacking position, pressing the documents against the protrusions 7 with a force that is such as to ensure the stability of the stack P, in particular to prevent the drop by gravity of a document (for example of a very long document), but such as to enable the stacked documents to be removed conveniently and to be handled at will.

[0078] The elastic means of the wall 9 may be calibrated in such a manner as to exert the appropriate force. The aforesaid elastic means may also be calibrated so that the wall 9 can easily retract, at least slightly, pushed by the forward stroke of the shifting device 6, i.e. during the step of moving a document from the cutting position to the stacking position, to permit and ensure that the protrusions 7 are passed by the moved document.

[0079] The printing apparatus 1 may comprise, in particular, programme instructions that can be implemented on the programmable controller to perform the following steps of a printing method (with reference to figures 14 to 17).

[0080] The shifting device 6 starts its forward stroke towards the printed document 5 in the cutting position not yet severed from the strip S (figure 14). Then the shifting device 6 continues its forward stroke until it arrives near or in contact with the document 5 (figure 15), afterwards an intermediate step occurs in which the shifting device 6 stops (or slows down) in at least one intermediate stop (or slowdown) position.

[0081] In the intermediate (stop or slowdown) step the shifting device 6 may, for example, press the document 5 against the stacking wall 9 or against the stack of documents already present in the stacking position. When the shifting device 6 is located in the intermediate step (in which it is substantially stationary or almost), the cutting device 5 separates the document 5 from the strip S (figure 16), in particular by the movement of the movable blade. When the document 5 has been separated, the shifting device 6 resumes the advancement (figure 17), in particular to ensure that the document 5 exceeds the protrusion/s 7 and arrives in the stacking position, leaving free the space in the cutting position for the next document. In this step, in which the shifting device 6 resumes the advancement, the stacking wall 9 can back away pushed by the shifting device 6. The shifting device 6 then returns back to the initial position for the next cutting cycle.

[0082] The separation of the document 5 is thus particularly precise and effective, since the shifting device 6, during the cutting, is already advanced (intermediate step of figure 16) in a still position in which, in particular, can be in contact with the document 5 (even with light pressure) and can stabilize the document 5.