WO2024100142A1 - Entraînement de bande - Google Patents

Entraînement de bande Download PDF

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Publication number
WO2024100142A1
WO2024100142A1 PCT/EP2023/081195 EP2023081195W WO2024100142A1 WO 2024100142 A1 WO2024100142 A1 WO 2024100142A1 EP 2023081195 W EP2023081195 W EP 2023081195W WO 2024100142 A1 WO2024100142 A1 WO 2024100142A1
Authority
WO
WIPO (PCT)
Prior art keywords
acceleration
velocity
tape
controller
target
Prior art date
Application number
PCT/EP2023/081195
Other languages
English (en)
Inventor
John Chambers
Paul Knowlton
Original Assignee
Dover Europe Sarl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dover Europe Sarl filed Critical Dover Europe Sarl
Publication of WO2024100142A1 publication Critical patent/WO2024100142A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/16—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/36—Ribbon-feed devices or mechanisms with means for adjusting feeding rate

Definitions

  • the present invention relates to improvements to a tape drive and methods of controlling a tape drive.
  • the embodiments of the invention may be suitable for a printing apparatus and, specifically, thermal transfer over-printers (TTO).
  • TTO thermal transfer over-printers
  • reels of ribbon are supported on spools and in use the ribbon is transferred between a supply spool and a take-up spool.
  • the rotational drive of the spools is controlled by one or more motors.
  • the take-up and supply spools must be rapidly accelerated and decelerated, ensuring ribbon is in the correct position relative to the print head and substrate so that a printing operation can take place, transferring ink to the substrate.
  • the spools must be coordinated to ensure that ribbon tension is maintained as it passes from the supply to the take-up.
  • the ribbons are required to be used efficiently (i.e., to make maximum use of the ribbon), there may be a rewind phase after each printing operation.
  • the ribbon reels need to be accelerated to the required rotational speeds and then these speeds maintained during the printing operation.
  • the reels are decelerated to stationary before any used ribbon is rewound to be ready for the next print.
  • Embodiments relating to the present disclosure seek to alleviate one or more of the problems associated with known systems.
  • a tape drive for use in a printing apparatus including a controller, and a first and a second spool support which are rotatable to move tape around a tape path between the first spool support and the second spool support, wherein the controller is operable to control acceleration and/or deceleration of the tape during an acceleration phase in which the tape is accelerated or decelerated from a starting velocity to a target velocity, and the acceleration phase includes: a plurality of steps, during each of which a respective acceleration / deceleration is applied, and in which an acceleration / deceleration in a first step is higher than a second step, occurring after the first step, when the tape is approaching the target velocity.
  • the acceleration phase may form an S -curve in the velocity of the tape.
  • the acceleration phase may include five or more steps (i.e. steps in which the acceleration or deceleration is different from an adjacent step in the acceleration phase).
  • the steps in combination across time may provide an approximate -curve in the velocity of the tape.
  • the acceleration phase may include five steps.
  • the controller may be operable to determine a target step velocity required for each step.
  • the controller may be operable to set the target step velocity to be substantially the same for every step of the acceleration phase.
  • the controller may be operable to determine a time interval for each step. The time interval may be based on the acceleration / deceleration applied and target step velocity required.
  • the target velocity (i.e. of the tape) may be determined by a substrate velocity. In other words, the speed of a substrate moving past the tape drive / printing apparatus may be detected and used to set the target for the tape.
  • the controller may be operable to update the target velocity.
  • the controller may be operable to update the acceleration phase while the acceleration phase is occurring.
  • the controller may be operable to reduce the acceleration in one or more of the steps if the target velocity is decreased.
  • the controller may be operable to increase the acceleration in one or more of the steps if the target velocity is increased.
  • the controller may be operable, in order to update the acceleration phase, to alter a target step velocity required for one or more steps to arrive at the updated target velocity.
  • the controller may be operable to decrease the target step velocity for one or more steps if the target velocity is decreased.
  • the controller may be operable to increase the target step velocity for one or more steps if the target velocity is increased.
  • the controller may be operable to shorten and / or length one or more of the steps of the acceleration phase.
  • the acceleration / deceleration may be highest in a median step.
  • the acceleration phase may represent a bell curve or gaussian curve.
  • the steps either side of the median acceleration step may mirror each other.
  • the printing apparatus may include a print head, and a sensor or monitor, communicatively coupled with the controller, which is configured to determine a velocity of a substrate moving past the print head.
  • Figure 1 illustrates tape velocity (mm/s) against time (ms);
  • Figure 2 illustrates tape acceleration (m/s 2 ) across an acceleration phase
  • Figure 3 illustrates velocity (m/s) and distance (m) travelled for a substrate against the velocity (m/s) and distance (m) travelled for a tape where the substrate is decelerating;
  • Figure 4 illustrates velocity (m/s) and distance (m) travelled for a substrate against the velocity (m/s) and distance (m) travelled for a tape where the substrate is decelerating;
  • Figure 5 illustrates velocity (m/s) and distance (m) travelled for a substrate against the velocity (m/s) and distance (m) travelled for a tape where the substrate is accelerating;
  • Figure 6 illustrates velocity (m/s) and distance (m) travelled for a substrate against the velocity (m/s) and distance (m) travelled for a tape where the substrate is accelerating;
  • Figure 7 is a schematic view of a tape drive.
  • a printer includes the reels of ribbon (also known as tape) being transferred between a supply and take-up spool.
  • a print head is used to transfer ink from the ribbon onto a substrate to print a desired image.
  • the ribbon speed needs to be matched to the speed of the substrate which is receiving the printed image.
  • the ribbon is accelerated and decelerated quickly achieve a desired printing rate.
  • the ribbon / tape does not act as a solid mass, and instead behaves like a distributed system with multiple masses with varying inertia in accordance with the distance from the centre of rotation, and deforms as it is accelerated.
  • This deformation causes the ribbon to store energy in a similar manner to a torsion spring, for example.
  • the outer part of the ribbon continues to accelerate as the ribbon returns to its unstressed state.
  • This overspeed on the outside of the ribbon then causes torsion in the opposite direction and the ribbon outer edge oscillates in a damped sinewave about the intended speed.
  • This oscillation causes an oscillating torque on the motor shaft(s). Extra current is required in the motor(s) to stop the torque causing the motors to lose control of the ribbon position.
  • the tape drive 1 includes a controller 10, a first spool support 12 and a second spool support 14.
  • the first and second spool support 12, 14 are rotatable to move tape 16 around a tape path between the first spool support 12 and the second spool support 14.
  • the tape 16 is mounted / wound on to a spool 20 supported on the first spool support 12, extends around the tape path (in this example, defined by four rollers 18), to a second spool 22 support on the second spool support 14.
  • the controller 10 is operable to control the rotation of the spool supports 12, 14 (and, thus, controls the transport of the tape 16 around the tape path).
  • each of the first and second spool supports 12, 14 is rotationally driven by a motor 13, 15.
  • the controller 10 controls signals transmitted to the motors 13, 15 in order to drive the spool supports 12, 14 in the desired manner.
  • this tape drive 1 is suitable for use in a printing apparatus.
  • a print head 30 is illustrated.
  • the print head 30 is moved during printing to contact the ribbon / tape 16 (which includes ink on a surface) and push the tape 16 against a substrate 32.
  • Heating elements are provided on the print head 30, which are selectively energised / heated, such that when the print head 10 is in contact with the tape 16, ink is melted and transferred onto the substrate 32 in a desired image.
  • the substrate 32 is transferred past the print head 30 over a roller or platen 34.
  • the substrate 32 is transported in a similar manner to the tape 16.
  • a controller (which may be the same controller as the tape drive or a different controller) controls rotation of a first and second substrate spool support, such that the substrate 32 can be transported around a substrate path as desired. It should be appreciated that the substrate transport mechanism does not need to be similar to the tape drive 1 0 the substrate 32 is moved past the print head 30 at a controlled speed.
  • the controller 10 controls movement of the spool supports 12, 14 1 this includes both the maintenance of a desired velocity and acceleration and deceleration of the tape 16.
  • the controller 10 is operable to control acceleration / deceleration of the tape 16 during an acceleration phase.
  • the acceleration phase is where the tape 16 is accelerated / decelerated from a starting velocity to a target velocity.
  • acceleration phase is intended to cover a phase of tape 16 movement in which an acceleration or deceleration is applied to bring the tape 16 to a target velocity.
  • the target velocity could be faster or slower than the starting velocity. Since the tape drive 1 can move the tape 16 both directions, the acceleration and / or deceleration could be in either direction also. Thus, the target velocity could be negative to switch directions of the tape 16.
  • the acceleration phase includes a plurality of steps. During each step a respective acceleration / deceleration is applied. Further, an acceleration / deceleration in a first step is higher than a second step, occurring after the first step, when the tape is approaching the target velocity. In other words, the acceleration / deceleration applied to the tape 16 (by the controller 10, through the spool support 12, 14 rotation) is lower in an interval as the tape velocity is approaching the target velocity than the acceleration / deceleration in one of the earlier steps. It should also be appreciated that although some of the examples discussed below mention only OaccelerationO of the tape 16, the same operations can be used for deceleration too.
  • the velocity of the tape 16 resembles an S-curve in the acceleration phase.
  • the controller 10 implements individual steps, each with a linear acceleration. When viewed across the entire acceleration phase, the steps form an approximate S-curve shape.
  • FIG. 1 illustrates velocity against time for a tape drive in which the starting velocity is Omm/s and the target velocity is 10OOmm/s.
  • the controller 10 is operable to split the acceleration phase into five steps. In other words, there are five time intervals in which the acceleration / deceleration applied is selected to ensure the tape 16 arrives at the target velocity at the appropriate time. It has been found that by instead applying a low-jerk approach to the rate of change of acceleration of the motor(s) (e.g.
  • Figure 2 illustrates the acceleration applied to achieve the velocity curve in figure 1 .
  • the first acceleration applied is relatively low.
  • an acceleration applied when the tape 16 is initially not accelerating i.e. moving at Omm/s or another constant velocity
  • a low acceleration at the start of an acceleration phase reduces the jerk on the tape 16 as it moves from Dno accelerationD to Dsome accelerationD.
  • the controller 10 can apply one or more higher rates of acceleration.
  • the controller 10 implements two further increases in acceleration D essentially, the acceleration progressively increases across three acceleration phase steps.
  • the controller 10 reduces the acceleration to a minimum value.
  • the acceleration phase step immediately before reaching target velocity is lower than the acceleration applied at a peak.
  • the controller 10 implements the highest acceleration in the median step of the acceleration phase. After the median step, the acceleration is progressively reduced until the tape 16 reaches the target velocity.
  • the controller 10 determines a target step velocity required for each step. In other words, the controller 10 assesses the difference between the starting velocity and the target velocity and divides the velocity difference between the steps of the acceleration phase. In the illustrated example, the controller 10 implements the same target step velocity to each step of the acceleration phase (i.e. the controller is operable to set the target step velocity to be substantially the same for every step of the acceleration phase).
  • figure 1 illustrates a velocity difference of 1000mm/s (i.e. the tape 16 needs to increase velocity from Omm/s to 1000mm/s) D in this instance the control 10 divides the velocity difference equally between the five steps of the acceleration phase.
  • each step has a target velocity increase of 200mm/s.
  • the time for each step can be assessed.
  • the acceleration and the velocity change are known for each step, so the time is calculated accordingly.
  • the time taken to complete the step and arrive at the target step velocity will be longer than those steps that can accommodate a higher acceleration.
  • the controller 10 could determine the acceleration needed in each step of the acceleration phase based on the velocity difference (between the starting velocity and the target velocity) and a time interval in which the tape 16 is required to the be at the target velocity.
  • the controller 10 may assign the require accelerations based on a requirements about the acceleration values permitted. In other words, the controller 10 knows that the first and last accelerations must be lowest and the that the median acceleration should be highest 0 from the requirements the controller 10 can determine what acceleration values should be applied in each step of the acceleration phase so that the tape 16 arrives at the target velocity (in the time required).
  • the controller 10 will have predetermined rules relating to the acceleration that can be applied. Thus, it may know that the first and last steps in the acceleration phase must be the lowest and apply the accelerations accordingly.
  • the controller 10 has a predetermined shape of what the acceleration curve (i.e. as illustrated in figure 2) should look like and will apply that in all acceleration phases. For example, the shape could be generally or approximate to a gaussian curve.
  • the steps of the acceleration phase mirror each other.
  • the first and fifth steps have the same acceleration
  • the second and fourth steps have the same acceleration
  • the third step has the highest acceleration.
  • the controller 10 in this case only has to determine three different acceleration values. However, this does not have to be the case and is discussed in more detail below.
  • the target velocity of the tape 16 is determined / related to a velocity of the substrate 32.
  • the controller 10 has information relating to the speed of the substrate 32 passing through the apparatus (and past the print head 30) and uses that to determine the target velocity of the tape 16.
  • the substrate 32 movement may be measured by a sensor (not shown) or a monitor, which is communicatively coupled with the controller 10.
  • the sensor or monitor is configured to determine the velocity of the substrate 32 moving past the print head 30.
  • the controller 10 may acquire or have knowledge directly from the substrate 32 movement mechanism 0 i.e. from another controller or system that transports the substrate 32. In any of these scenarios, knowledge of the substrate 32 transport is transmitted to the controller 10 and the controller 10 uses that to determine how to control the movement of the tape 16.
  • a function such as a logistic function /(*) is an example of a function defining a suitable curve.
  • Other forms of S-shaped curve may also be used. This gradually applies acceleration to the reels and then gradually removes it, minimizing the jerk. In embodiments, this can be implemented by use of a five-step pseudo S Curve acceleration profile to accelerate the motor, for example 0 i.e., a curve approximating an S curve at five values over the range, defining a relatively smoothed profile.
  • the determination of the acceleration profile is recalculated at intervals during the acceleration process, according to methods described below.
  • the controller 10 is operable to update the target velocity and update the acceleration phase while the acceleration phase is occurring.
  • the target velocity of the ribbon 16 is not known when the ribbon 16 movement is started. This is because the substrate 32 may accelerate or decelerate (or both) during the period in which the ribbon 16 is accelerating.
  • the controller 10 is operable to either increase or decrease the acceleration in one or more steps of the acceleration phase depending on the change in target velocity required. For example, if the target velocity for the tape 16 is decreased, the controller 10 is operable to reduce the acceleration in one or more of the steps. Likewise, if the target velocity for the tape 16 is increased, the controller 10 may be operable to increase the acceleration in one or more of the steps.
  • the controller 10 is operable to alter a target step velocity required for one or more steps (which may be instead of or in addition to increasing or decreasing the acceleration) so that the updated target velocity for the tape 16 is reached. For example, if the target velocity if decreased, the controller 10 is operable to decrease the target step velocity for one or more steps. Likewise, if the target velocity is increased, the controller 10 is operable to increase the target step velocity for one or more steps.
  • aspects of the acceleration phase can be altered while the tape 16 is being accelerated.
  • the controller 10 can alter one or both of the acceleration and the target step velocity for one or more steps in the acceleration phase to ensure that at the end of the acceleration phase, the tape 16 has the updated target velocity.
  • the steps are calculated (in the DSD curve) as they are required during the acceleration phase.
  • the target velocity is the speed of the substrate 32.
  • the target velocity defines the five velocity target points (i.e. each of the steps in the acceleration phase) where the accelerations change. If the velocity target points are recalculated every time the substrate 32 velocity changes, sections of the pseudo S-Curve can be extended or compressed to target the substrate 32 velocity as it changes.
  • Figure 3 to 6 illustrate examples of substrate 32 and tape 16 movement including an acceleration phase.
  • the lines with circles along them correspond to the velocity and the lines with no circles correspond to the distance
  • the solid lines correspond to the tape 16
  • the dashed lines correspond to the substrate 32.
  • Figures 3 and 4 illustrate an example in which the substrate 32 velocity is slowing down / decreasing over time.
  • the target velocity for the tape 16 is decreasing over time (and decreases after the controller 10 has initiated the acceleration phase to increase the tape 16 velocity to match the substrate 32).
  • Figure 3 illustrates an example in which the controller 10 alters the target step velocity of the tape 16 only.
  • the target velocity at the end of each step of the acceleration phase is decreased as the acceleration phase continues 0 resulting in the tape 16 matching the velocity of the substrate 32 at a time of around 0.03s.
  • the tape 16 velocity as the acceleration phase ends must drop sharply to match the movement of the substrate 32.
  • the sudden change in acceleration rates cause unwanted jerking in the tape 16.
  • both the target step velocity and the acceleration for each step can be altered.
  • This approach is illustrated in figure 4 0 the substrate 32 is slowing down in the same way as in figure 3.
  • the acceleration applied in each step of the acceleration phase is altered alongside reducing the target step velocity.
  • the acceleration in step one of the acceleration phase remains the same as in figure 3 but subsequent acceleration values in the next steps are reduced.
  • the acceleration in the last step is much lower than in figure 3, which results in a smaller change when the acceleration phase ends and the tape 16 matches the velocity of the substrate 32.
  • the trade-off is that the tape 16 joins the substrate at a later time (i.e. the acceleration phase is longer) 0 in this case the acceleration phase ends at about 0.04s rather than 0.03s as discussed above.
  • Figures 5 and 6 illustrate an example in which the substrate 32 velocity is increasing over time.
  • the target velocity for the tape 16 is also increasing over time (and increases after the controller 10 has initiated the acceleration phase to move the tape 16 velocity to match the substrate 32).
  • figures 5 and 6 illustrate the same.
  • the acceleration phase begins and the controller 10 progressively increases the target velocity reached at the end of each step. This in turn, extends the length of each step to accommodate the longer amount of time it takes for the tape to reach the altered target step velocity.
  • the tape 16 is still being accelerated toward the substrate 32 value (and extends off the end of the graph).
  • the controller 10 increases the acceleration in step two onwards (shown by the increased gradient on the tape velocity line in figure 6). This means that the tape 16 reaches the substrate 32 faster. As can also be seen, the difference between the last step of the acceleration phase and when the tape 16 is matched to the substrate 32 is relatively small (which means the tape 16 transitions to a phase where it moves with the substrate 32 more smoothly / less jerk is experienced in the tape 16).
  • the controller 10 is operable to compress or lengthen one or more steps in the acceleration phase.
  • the length of each step of the acceleration phase can be altered by the controller 10 in order to bring the tape 16 to the new / updated target velocity in an improved way (i.e. with minimised difference between the end of the acceleration phase and the start of the substrate matched phase).
  • the acceleration is profile is not allowed to move back from a higher stage to a lower one in the pseudo S-Curve profile.
  • the controller 10 does not reverse the acceleration phase and move the tape 16 backwards to the step three (and the associated increase in acceleration that would bring). This prevents the acceleration from changing rapidly between two values around a velocity target point.
  • the acceleration values of the pseudo S-Curve are reduced by a function of the amount of reduction in the substrate speed.
  • the acceleration values are increased by a function of the amount of increase of the substrate velocity.
  • a curve defining the acceleration profile is determined when the motor is to be accelerated, to a target velocity.
  • the acceleration S curve profile is exited at that target velocity, it may be the case that the velocity of the substrate 32 has changed and the target ribbon 16 velocity has therefore also altered during the acceleration process.
  • a mismatch remains between the velocity reached and the target velocity of the ribbon 16, such that the S curve profile ends abruptly, with a correction occurring to reach the revised target velocity. This results in some level of jerk occurring during the highest acceleration phase.
  • the level of acceleration used in the DSD curve can be updated as the substrate 32 speed changes, and corresponding ribbon target velocity changes. These changes are applied as smoothly as possible to avoid the introduction of additional jerk due to the changes of the rates of acceleration. Importantly, the acceleration needs to be reduced gradually at the end of the acceleration phase as the target velocity is reached.
  • the target velocity of the ribbon may be recalculated at regular intervals, and / or a change in the target velocity may trigger a recalculation of the S curve acceleration profile.
  • the S curve acceleration profile is defined by a predefined number of acceleration rates occurring at defined time intervals, approximating the shape of the S curve.
  • the curve is defined by five intermediate rates of acceleration over the period of the curve. In other embodiments, more or fewer than five intermediate rates are determined D for example, between 3 and 50, or between 5 and 25, or between 5 and 15, or between 5 and 9, and preferably 5 intermediate rates are determined.
  • the print cycle may include a tracking phase where the speed of the ribbon 16 tracks the speed of the substrate 32 until the print position on the substrate 32 is reached.
  • Embodiments of the present disclosure improve the handling and transport of the tape 16 in the tape drive 1 .
  • the controller 10 is operable to minimise the jerk in the tape 16. This is achieved by keeping the acceleration low at the start of the acceleration phase D i.e. where the tape 16 starts to accelerate or decelerate is does so without much change from the current / starting velocity. Likewise, as the tape 16 approaches the target velocity, the acceleration I deceleration is low 0 the change between the acceleration phase and the ongoing velocity once the target velocity is met is low.
  • the rotational speeds are set to deliver the correct linear tape 16 speed past the print head 30.
  • the acceleration and deceleration phases need to be as short as possible to allow the time between prints to be minimised.
  • the discussed operation is advantageous 0 since a low acceleration would reduce the jerk when the tape 16 arrives at its target velocity but would take a longer time to reach the target velocity. Whereas, a high acceleration would result in jerking movement and risks distorting the tape 16. Thus, a linear acceleration is either slow or risks impacting the print quality.
  • the invention may also broadly consist in the parts, elements, steps, examples and/or features referred to or indicated in the specification individually or collectively in any and all combinations of two or more said parts, elements, steps, examples and/or features.
  • one or more features in any of the embodiments described herein may be combined with one or more features from any other embodiment(s) described herein.

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  • Character Spaces And Line Spaces In Printers (AREA)

Abstract

L'invention concerne un entraînement de bande (1) destiné à être utilisé dans un appareil d'impression comprenant : un dispositif de commande (10), et un premier et un second support de bobine (12, 14) qui peuvent tourner pour déplacer la bande (16) autour d'un trajet de bande entre le premier support de bobine (12) et le second support de bobine (14). Le dispositif de commande (10) peut être utilisé pour commander l'accélération et/ou la décélération de la bande (16) pendant une phase d'accélération dans laquelle la bande est accélérée ou décélérée d'une vitesse de départ à une vitesse cible, la phase d'accélération comprenant : une pluralité d'étapes, pendant chacune desquelles une accélération/décélération respective est appliquée, et dans laquelle une accélération/décélération dans une première étape est supérieure à une accélération/décélération dans une seconde étape se produisant après la première étape, lorsque la bande s'approche de la vitesse cible.
PCT/EP2023/081195 2022-11-08 2023-11-08 Entraînement de bande WO2024100142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2216635.9 2022-11-08
GBGB2216635.9A GB202216635D0 (en) 2022-11-08 2022-11-08 Improved printer and method of controlling ribbon drive in a printer

Publications (1)

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WO2024100142A1 true WO2024100142A1 (fr) 2024-05-16

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PCT/EP2023/081195 WO2024100142A1 (fr) 2022-11-08 2023-11-08 Entraînement de bande

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WO (1) WO2024100142A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0717120A (ja) * 1993-06-30 1995-01-20 Nippon Signal Co Ltd:The 熱転写印刷装置
US20200130375A1 (en) * 2017-06-28 2020-04-30 Videojet Technologies Inc. Transfer printer and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0717120A (ja) * 1993-06-30 1995-01-20 Nippon Signal Co Ltd:The 熱転写印刷装置
US20200130375A1 (en) * 2017-06-28 2020-04-30 Videojet Technologies Inc. Transfer printer and method

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