JP2013010288A - Method of controlling drive device, the drive device including the same, and tape printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of controlling a drive device or the like capable of reliably eliminating play based on backlash of a gear train, irrespective of a contact direction of a tooth surface.SOLUTION: This method of controlling a conveyance drive device 22b including a DC motor 221 serving as a power source, a platen roller 22a actuated by the DC motor 221, and a platen side gear train 224 transmitting the power of the DC motor 221 to the platen roller 22a comprises a play elimination step of finely driving the DC motor 221 before the actuation of the platen roller 22a to eliminate the play based on the backlash of the platen side gear train 224 without actuating the platen roller 22a.

Description

  The present invention relates to a method for controlling a drive device including a gear train that transmits the power of a motor to an operation target, a drive device including the drive device, and a tape printer.

2. Description of the Related Art Conventionally, there is known a driving device for a printing apparatus that includes a motor as a power source, a platen roller (operation target) that is rotated by the motor, and a gear train that transmits the motor force to the platen roller (Patent Literature). 1).
In such a drive device, the motor may idle (the platen roller does not rotate) due to play based on backlash between the two gears engaged in the gear train. In this case, when printing is started in synchronization with the driving of the motor, the printing progresses in a state in which the printing medium is not fed by the platen roller, resulting in a printing failure. In view of this, this driving apparatus employs a control method in which the idling amount is measured in advance, the measurement result is stored as an expected idling amount, and the start of printing with respect to the start of motor driving is delayed based on the anticipated idling amount.

JP 2009-148926 A

  However, the conventional control method for the driving device requires time and effort to measure and store the slipping amount, and it is considered that it often depends on experience and intuition to determine the expected slipping amount. In addition, since it is impossible to recognize whether the tooth surface is in the normal rotation direction or the reverse rotation direction between the two gears, for example, the normal rotation is performed with the tooth surface in contact with the normal rotation direction. In this case, the motor drive control based on the expected idling amount has no meaning at all, and there is a problem that printing failure may be caused.

  The present invention provides a method for controlling a driving device capable of reliably removing play based on backlash of a gear train regardless of the contact direction of the tooth surface, a driving device including the same, and a tape printing device. Let it be an issue.

  The drive device control method of the present invention is a drive device control method comprising a motor as a power source, an operation target operated by the motor, and a gear train that transmits the power of the motor to the operation target. And a play removing step of removing play based on the backlash of the gear train without causing the motor to be actuated prior to the actuation of the actuated object.

  According to this configuration, the play based on the backlash of the gear train can be removed by minutely driving the motor to such an extent that the operation target is not operated before the operation target is operated. Thereby, it is not necessary to measure and store the idling amount in advance, and the same regardless of the direction (forward rotation direction or reverse rotation direction) in which the tooth surfaces of any two gears constituting the gear train are in contact with each other. Control can easily eliminate play based on backlash.

  In this case, in the play removing step, it is preferable to remove the play by rotating the motor slightly by the driving voltage when operating the operation target and rotating the motor by inertia.

  According to this configuration, when the tooth surfaces of any two gears constituting the gear train are not in contact with each other and the gap is open, the motor rotates in a direction that eliminates the gap by a minute rotation of the motor, and then by inertial rotation. The tooth surfaces contact each other. Thereby, the play based on the backlash of the gear train can be eliminated without operating the operation target. On the other hand, even when the tooth surfaces of the two gears are in contact with each other, since the motor is driven for a very short time such that the gear train rotates slightly, the operation target does not operate.

  In this case, in the play removal step, it is preferable to remove play by slightly rotating the motor with a low drive voltage that does not operate the operation target.

  According to this configuration, since the motor is driven at a low voltage that does not actuate the object to be actuated, backlash can be easily achieved with the same control regardless of the direction in which the tooth surfaces of any two gears are in contact with each other. Based play can be eliminated.

  The drive device of the present invention includes a motor that is a power source, an operation target that is operated by the motor, a gear train that transmits the power of the motor to the operation target, and a control unit that controls the motor. Is characterized by removing play based on the backlash of the gear train without causing the motor to be actuated by slightly driving the motor prior to actuation of the object to be actuated.

  According to this configuration, the play based on the backlash of the gear train can be removed by minutely driving the motor to such an extent that the operation target is not operated before the operation target is operated. Thereby, it is not necessary to measure and store the idling amount in advance, and the same regardless of the direction (forward rotation direction or reverse rotation direction) in which the tooth surfaces of any two gears constituting the gear train are in contact with each other. Control can easily eliminate play based on backlash.

  The tape printer of the present invention comprises a tape feeder having a feed roller for feeding a print tape, and a print head for printing on the print tape, and reversely feeds the front end of the set print tape to the vicinity of the print head. From the above, it is a tape printing apparatus for carrying out the normal feeding of the printing tape in synchronization with the drive of the print head, the feed roller as an operation target, and the tape feeding apparatus as a driving device. Is performed immediately before the forward feed.

  According to this configuration, the play based on the backlash of the gear train is eliminated by driving the motor minutely to the extent that the feed roller is not operated before the forward feeding of the printing tape synchronized with the drive of the print head. be able to. As a result, the motor rotates the feed roller without idling, and the normal feeding of the printing tape and the driving of the printing head are performed in synchronization with each other normally. Then, printing on the printing tape is accurately performed without causing printing failure.

It is an external appearance perspective view of the tape printer concerning this embodiment. FIG. 2 is an external perspective view of the tape printing apparatus with the lid case opened and the tape cartridge and ribbon cartridge mounted. FIG. 3 is an external perspective view of the tape printer with the lid case opened and the tape cartridge and ribbon cartridge removed. It is a sectional side view of the tape printer concerning this embodiment. It is a side view of the conveyance drive device of a tape conveyance mechanism. (A) is a perspective view of a tape cartridge, (b) is a perspective view of a tape body and a shaft holder. (A) is the graph which showed the relationship between the voltage and time of a DC motor, the rotation speed of a DC motor and a platen roller, and time, (B) is a graph which shows each relationship in the case of the modification. (A) is a flowchart of a printing interruption process, (b) is a graph which shows the relationship between the rotation speed of DC motor, and time.

  Hereinafter, a tape printer according to an embodiment of the present invention will be described with reference to the accompanying drawings. This tape printer is equipped with a tape cartridge that contains a roll of printing tape and a ribbon cartridge that contains an ink ribbon. The printing tape and ink ribbon are fed out and printed while running to print the printing tape. The label is made by cutting the finished part.

  The tape printer 1 will be described with reference to FIGS. FIG. 1 is an external perspective view of the tape printer 1. FIG. 2 is an external perspective view of the tape printer 1 with the lid case 15 opened and the tape cartridge 12 and the ribbon cartridge 17 attached. FIG. 3 is an external perspective view of the tape printer 1 with the lid case 15 opened and the tape cartridge 12 and the ribbon cartridge 17 removed. FIG. 4 is a side sectional view of the tape printer 1. FIG. 5 is a side view of the transport driving device 22 b of the tape transport mechanism 22. In the following description, up and down, front and rear, left and right are defined as shown by arrows in each figure.

  As shown in FIGS. 1 to 4, the tape printing apparatus 1 includes an apparatus main body case 10 that forms a main outer shell thereof, a transport assembly 11 incorporated in the apparatus main body case 10, and an attachment / detachment in the transport assembly 11. A tape cartridge 12 that is freely mounted, a lid case 15 that is openable and closable so as to cover the apparatus main body case 10, a printing assembly 16 that is incorporated in the lid case 15, and a removable attachment in the printing assembly 16. And a ribbon cartridge 17 that is freely mounted.

  Further, the tape printer 1 incorporates a control device (not shown) for driving and controlling each component device. Further, a control terminal 18 (personal computer or the like) is connected to the tape printer 1 via a connection port, and a user operates the tape printer 1 via the control terminal 18 to execute a printing operation. . The apparatus main body case 10 and the lid case 15 constitute an apparatus case that forms the overall appearance of the tape printer 1.

  A sheet discharge port 20 for discharging the printed printing tape 32 to the outside is provided at the front center of the apparatus main body case 10. The printing tape 32 is fed out from the tape cartridge 12 disposed at the rear portion and used for printing while being sent toward the sheet discharge port 20.

<Transfer assembly>
The transport assembly 11 cuts the tape mounting portion 21 for mounting the tape cartridge 12, the tape transport mechanism 22 (see FIGS. 4 and 5) that feeds the print tape 32 from the tape cartridge 12, and the printed print tape 32. And a tape detection mechanism 24 for detecting the presence or absence of the printing tape 32 fed out on the conveyance path.

  The tape mounting portion 21 is recessed inwardly at the rear of the apparatus body case 10 so that the tape cartridge 12 can be set at a so-called centering (center in the left-right direction) position.

  As shown in FIGS. 3 to 5, the tape transport mechanism 22 is disposed in front of the tape mounting portion 21, and includes a so-called platen roller 22 a and a transport driving device 22 b that rotationally drives the platen roller 22 a. Yes. The platen roller 22a abuts on the lower surface of the printing tape 32 fed out from the tape cartridge 12, and conveys the printing tape 32 to the sheet discharge port 20 communicating with the front in cooperation with a thermal head 521 described later. (Refer to the broken line in FIG. 4A).

  As shown in FIG. 5, the conveyance drive device 22b includes a DC motor 221 serving as a power source, a worm gear 222 connected to the output shaft of the DC motor 221, a worm wheel gear 223 that meshes with the worm gear 222, and a platen roller 22a. It has a platen side gear train 224 that transmits the rotational force, and a winding side gear train 225 that transmits the rotational force to the winding core 63 of the ribbon cartridge 17 described later. The conveyance driving device 22b rotates the platen roller 22a and the winding core 63 in synchronization.

  The platen side gear train 224 includes a platen input gear 226 that meshes with the worm wheel gear 223, and a platen output gear 227 that meshes with the platen input gear 226 and is axially attached (rotatably mounted) to one end of the platen roller 22a. Have.

  The take-up gear train 225 meshes with a take-up input gear train 228 that meshes with the worm wheel gear 223 and an output-side gear of the take-up input gear train 228, and takes up with the take-up gear ( A take-up output gear 229 that meshes with (not shown).

  Needless to say, there is a backlash between each gear. Therefore, the play based on the backlash causes a slight backlash in the rotational direction of the platen roller 22a. Although details will be described later, the tape printer 1 (control device) according to the present embodiment performs drive control of the DC motor 221 for removing play based on backlash before printing is started and before and after tape cutting by the cutter mechanism 23. Do. Note that backlash between the worm gear 222 and the worm wheel gear 223, which are screw gears, can be ignored, and the worm gear 222 cannot be rotated even if a rotational force is applied to the platen roller 22a.

  As shown in FIG. 4, the cutter mechanism 23 is a so-called scissor type in which a fixed blade and a movable blade face each other with the printing tape 32 interposed therebetween, and is provided in front of the platen roller 22a. . The printing tape 32 for which the printing process has been completed is cut by the cutter mechanism 23 and discharged from the sheet discharge port 20 to the outside.

  As shown in FIGS. 2 and 4, the tape detection mechanism 24 is a so-called reflection type photosensor, and is incorporated in a first sliding contact member 25 provided between the tape cartridge 12 and the tape transport mechanism 22. The first photoelectric element 26 and the second photoelectric element 28 provided in the sheet discharge port 20 in front of the cutter mechanism 23 and incorporated in the second sliding contact member 27 are included. The first photoelectric element 26 and the second photoelectric element 28 are disposed so as to face the lower surface of the printing tape 32.

  Although not shown, each of the first photoelectric element 26 and the second photoelectric element 28 has a light emitting element and a light receiving element, and depending on whether or not the light emitted from the light emitting element is received by the light receiving element, the printing tape The presence or absence of 32 is detected. The tape printer 1 (control device) according to the present embodiment stops the tape transport mechanism 22 and the printing mechanism 52 when the printing tape 32 runs out and the first photoelectric element 26 cannot receive the reflected light. That is, the first photoelectric element 26 performs so-called tape end detection by detecting the presence or absence of the print tape 32. By detecting the tape end, so-called empty printing can be prevented, and deterioration and damage of the platen roller 22a and the thermal head 521 based on empty printing can be effectively prevented. Further, the second photoelectric element 28 detects the discharge of the printing tape 32.

  The first slidable contact member 25 and the second slidable contact member 27 serve as a path (conveyance path) through which the fed printing tape 32 is slidably contacted and is substantially the same width as the maximum width of the printing tape 32. It is formed in a table shape. In addition, a first opening 25 a serving as an optical path of the first photoelectric element 26 is formed at the substantially center in the left-right direction of the first sliding contact member 25, and similarly, the second photoelectric element 28 is formed in the second sliding contact member 27. A second opening 27a is formed as an optical path. The light emitting element and the light receiving element (not shown) of the first photoelectric element 26 are disposed in the first opening 25 a so as not to protrude from the upper end surface of the first sliding contact member 25, and similarly, the second photoelectric element 28. The light emitting element and the light receiving element (not shown) are arranged in the second opening 27 a so as not to protrude from the upper end surface of the second sliding contact member 27.

  As described above, the tape detection mechanism 24 can detect the printing tape 32 on the sliding members 25 and 27, and the distance between the photoelectric elements 26 and 28 and the printing tape 32 can be kept constant. It has become. As a result, even when the printing tape 32 being transported slightly fluctuates on the transport path, the distance between the printing tape 32 and each of the photoelectric elements 26 and 28 can be kept constant, which is reliable and stable. The detected print tape 32 can be detected. The first sliding contact member 25 and the second sliding contact member 27 may be omitted in order to minimize light diffusion and reflection.

<Tape cartridge>
Next, the tape cartridge 12 will be described in detail with reference to FIG. 2, FIG. 4, and FIG. FIG. 6A is a perspective view of the tape cartridge 12, and FIG. 6B is a perspective view of the tape body 30 and the shaft holder 34.

  The tape cartridge 12 includes a tape body 30 formed by winding a printing tape 32 around a tape core 33, and a cartridge case 31 that rotatably supports the tape core 33. The tape cartridge 12 is detachably mounted on the tape mounting portion 21. The tape cartridge 12 contains printing tapes 32 of different types having different widths and colors. In consideration of user friendliness, so-called roll paper and die-cut tape are prepared.

  Although illustration is omitted, the printing tape 32 is a so-called die-cut tape in which a plurality of labels are stuck on a long release paper at equal intervals. The release paper is formed thin and weaker than the label.

  As shown in FIG. 6B, the tape body 30 is formed by winding a printing tape 32 around the outer periphery of a paper-made hollow cylindrical tape core 33. The tape body 30 is rotatably supported by shaft holders 34 positioned at both axial ends of the tape core 33. Note that an adhesive sheet (not shown) is attached to both end faces of the tape body 30 to prevent the wound printing tape 32 from being broken.

  As shown in FIG. 6A, the cartridge case 31 includes a pair of shaft holders 34 that pivotally support both ends of the tape body 30 (tape core 33), and a main body case 35 that houses the tape body 30 together with the pair of shaft holders 34. And have.

  The main body case 35 includes a tape cover portion 351 that covers the lower peripheral surface of the tape body 30 and a pair of side wall portions 352 that are erected at both left and right ends of the tape cover portion 351. The tape cover portion 351 is formed such that the rear thereof is curved along the peripheral surface of the tape body 30. Each side wall part 352 is formed in a disk shape larger than the diameter of the tape body 30. Note that a plurality of protrusions that are detected portions for detecting the type of the printing tape 32 are provided on the lower surface of the tape cover portion 351 (not shown).

  A position restricting groove (not shown) that is slightly recessed in the up-down direction is formed in a substantially complementary shape with the shaft holder 34 at the inner side of each side wall portion 352 and in a substantially central portion in the front-rear direction. When the pair of shaft holders 34 that pivotally support the tape body 30 are fitted in the position restricting grooves of the side wall portions 352, the tape body 30 and the side wall portions 352 are positioned substantially coaxially.

<Lid case>
As shown in FIGS. 1 to 4, the lid case 15 is rotatably provided so as to be flipped forward about a hinge 15 a provided at the rear end, and the transport assembly 11 (tape mounting portion 21). It is used as an open / close lid that opens. Further, when the lid case 15 is opened, the printing assembly 16 (ribbon mounting portion 51) is opened. As a result, the tape cartridge 12 and the ribbon cartridge 17 can be replaced, and maintenance of each mechanism can be performed.

<Printing assembly>
As shown in FIGS. 2 to 4, the printing assembly 16 includes a ribbon mounting portion 51 for mounting the ribbon cartridge 17 and a printing mechanism 52 for performing printing processing on the printing tape 32.

  The ribbon mounting portion 51 includes a feeding mounting portion 511 that is recessed in the rear side of the printing mechanism 52 and a winding mounting portion 512 that is recessed in the front side of the printing mechanism 52 inside the lid case 15. Have. That is, the ribbon cartridge 17 is mounted on the ribbon mounting portion 51 so as to straddle the printing mechanism 52. 2 and 3, the feeding mounting portion 511 is located on the near side of the winding mounting portion 512 (downward with the lid case 15 closed).

  The printing mechanism 52 is arranged in front of and behind the thermal head 521 so that the so-called thermal head 521, a head drive device (not shown) that drives and controls the thermal head 521, and the ink ribbon 61 face the heat generating portion of the thermal head 521. And a pair of ribbon path changing shafts 522 that change the travel path 66 of the ink ribbon 61. The thermal head 521 is disposed so as to be in sliding contact with the printing tape 32 via the ink ribbon 61 from above at the position where the platen roller 22a is disposed (see FIG. 4).

<Ribbon cartridge>
Next, the ribbon cartridge 17 will be described with reference to FIGS. 2, 4 and 5. 2, 4, and 5, the ribbon cartridge 17 includes a ribbon body 60 formed by winding the ink ribbon 61 around the feeding core 62, a winding core 63 that winds up the used ink ribbon 61, And a ribbon case 64 that rotatably supports the feeding core 62 and the winding core 63.

  The ribbon case 64 includes a feeding case portion 80 that rotatably accommodates the feeding core 62, a winding case portion 81 that rotatably accommodates the winding core 63, and left and right ends of the feeding case portion 80 and the winding case portion 81. And a pair of connecting portions 82 connected in the front-rear direction across the travel path 66 of the ink ribbon 61. The ink ribbon 61 fed out from the ribbon body 60 is exposed from the ribbon delivery port 83 formed in the feeding case portion 80, passes through the traveling path 66, and is drawn into the ribbon drawing port 87 formed in the winding case portion 81. And wound on the winding core 63.

<Ribbon cartridge installation>
As shown in FIG. 2, when the ribbon cartridge 17 is mounted on the ribbon mounting portion 51, the feeding case portion 80 is first mounted on the feeding mounting portion 511, and the winding case portion 80 is then centered on the feeding case portion 80. 81 is rotated and attached to the take-up attachment portion 512. As a result, the ink ribbon 61 fed to the traveling path 66 comes into contact with the thermal head 521 and the pair of ribbon path changing shafts 522.

  At this time, it is conceivable that the winding case portion 81 rotated for mounting on the winding mounting portion 512 contacts the thermal head 521 or the downstream ribbon path changing shaft 522. In this case, the contact can be prevented by widening the distance (running path 66) between the feeding case portion 80 and the winding case portion 81. However, when the traveling path 66 is lengthened, there are problems such as an increase in the size of the ribbon cartridge 17 (tape printing apparatus 1) and the tendency of the ink ribbon 61 to be loosened.

  Therefore, as described above, the ribbon mounting portion 51 according to the present embodiment places the feeding case portion 80 by positioning the feeding mounting portion 511 in front of the winding mounting portion 512 in FIGS. 2 and 3. Can be easily performed. That is, when the ribbon cartridge 17 is attached to the ribbon attachment portion 51 and the lid case 15 is closed, the feeding attachment portion 511 is positioned below the winding attachment portion 512 (see FIG. 4). Further, this makes it possible to prevent the rotated winding case portion 81 from contacting the thermal head 521 and the downstream ribbon path changing shaft 522 without enlarging the traveling path 66.

<Conveying route of printing tape>
As shown in FIG. 4, the printing tape 32 is sandwiched between the thermal head 521 and the platen roller 22a via the ink ribbon 61, and is fed from the tape body 30 by the rotation of the platen roller 22a. Thus, the printing process is performed. The printing process is performed by the DC motor 221 rotating the winding core 63 and the platen roller 22a in synchronization. The printing tape 32 after the printing process is sent to the sheet discharge port 20, while the ink ribbon 61 is wound on the winding core 63. The thermal head 521 and the platen roller 22a are formed to have substantially the same width as the maximum width of the printing tape 32.

<How to remove play before starting printing>
When performing the printing process in the tape printer 1, the thermal head 521 is pressed against the platen roller 22a via the printing tape 32 and the ink ribbon 61 with a predetermined pressure, so that the platen roller 22a (and the winding core) are pressed. 63) rotates without slipping. The printing process is performed in synchronization with the driving of the DC motor 221. However, a gear train for transmitting the driving force to the platen roller 22a when the lid case 15 is opened to replace the tape cartridge 12 or the ribbon cartridge 17 or when vibration is applied by the movement of the tape printer 1. By the play based on the backlash, the platen roller 22a is slightly shaken in the transport direction.

  At this time, if the tooth surfaces of the gears are in contact with the direction in which the platen roller 22a is rotated forward (forward rotation direction), the driving force (rotational force) from the DC motor 221 is delayed in time. The print process is performed normally. However, when the play (gap) based on the backlash is in the forward rotation direction of the platen roller 22a, even if the DC motor 221 and the platen side gear train 224 are rotated, the time for moving the play (gap) is The platen roller 22a does not rotate. That is, the DC motor 221 and the platen side gear train 224 are idled. The term “idling” refers to rotation of the DC motor 221 and the platen side gear train 224 when the platen roller 22a does not rotate even though the DC motor 221 and the platen side gear train 224 are rotating.

  In this case, when printing is started in synchronization with the driving of the DC motor 221, the printing process proceeds in a state where the printing tape 32 is not fed by the platen roller 22a, resulting in a printing failure. In addition, it cannot be recognized whether the direction in which the tooth surface abuts between the arbitrary two gears is the normal rotation direction or the reverse rotation direction.

  Therefore, in the tape printer 1 according to the present embodiment, the conveyance driving device 22b is controlled to remove the play based on the backlash of the platen side gear train 224 before starting the printing process.

  With reference to FIG. 7, the control method of the conveyance drive device 22b in the tape printer 1 according to the present embodiment will be described. FIG. 7A is a graph showing the relationship between the voltage and time of the DC motor 221 and the rotation speed and time of the DC motor 221 and the platen roller 22a, and FIG. 7B shows each relationship in the modification. It is a graph to show.

  The control method of the transport driving device 22b by the control device of the tape printer 1 is that the platen roller 22a is rotated, that is, the DC motor 221 is finely driven prior to the transport of the printing tape 32, and the platen roller 22a is not rotated. A play removing step for removing play based on backlash of the side gear train 224 is provided.

  In the play removing step, the play is removed by rotating the DC motor 221 slightly with a driving voltage (normal voltage) when the platen roller 22a is rotated, and rotating the platen roller 22a by inertia. Specifically, as shown in FIG. 7 (a1), the control device of the tape printing apparatus 1 is only for a short time (time shown in FIG. 7 (a)) that the platen roller 22a does not rotate with respect to the DC motor 221. Apply normal voltage. The normal voltage application time is set to 10 msec in this embodiment.

  At this time, when the play (gap) based on the backlash is in the forward rotation direction, the driving force of the DC motor 221 constitutes the worm wheel gear 223 and the platen side gear train 224 as shown in FIG. The platen input gear 226 and the platen output gear 227 are slightly rotated in the forward rotation direction. In other words, the gears 223, 226, and 227 rotate in a direction that eliminates the gap by the minute rotation of the DC motor 221. Thereafter, when the normal voltage to the DC motor 221 is cut off, the gears 223, 226, and 227 rotate in the normal rotation direction due to inertia (see FIG. 7 (i)). Then, the tooth surfaces between the gears 223, 226, 227 come into contact with each other, and the rotation of the gears 223, 226, 227 is stopped. Thereby, the play based on the backlash of the platen side gear train 224 can be eliminated without rotating the platen roller 22a.

  On the other hand, when there is play (gap) based on backlash in the reverse rotation direction, that is, when the tooth surfaces between the gears 223, 226, 227 are in contact with each other in the normal rotation direction, as shown in FIG. Furthermore, even if a normal voltage is applied to the DC motor 221 for a short time, the gears 223, 226, 227 and the platen roller 22a do not rotate. This is because the application time of the normal voltage to the DC motor 221 is very short, and energy necessary for rotating the gears 223, 226, 227 and the platen roller 22a cannot be obtained.

  Then, after the play removal step (after the time shown in FIG. 7A), the DC motor 221 is rotated to perform the printing process, and the platen roller 22a is rotated forward (see FIG. 7A4).

  As a result, play based on backlash is easily removed with the same control regardless of the direction in which the tooth surfaces of the gears 226 and 227 constituting the platen side gear train 224 are in contact with each other (forward rotation direction or reverse rotation direction). can do. Further, the DC motor 221 rotates the platen roller 22a without idling, and the normal feeding of the printing tape 32 and the driving of the printing head 32a are performed in synchronization with each other normally. The printing on the printing tape 32 can be performed accurately without causing printing failure.

  Note that the control method (play removal step) of the transport driving device 22b according to the present embodiment controls the driving of the DC motor 221 by turning the power ON / OFF (voltage application), but instead of this, PWM control is performed. The driving of the DC motor 221 may be controlled by a known control method. Further, although the control method of the transport driving device 22b is automatically performed by the control device of the tape printer 1 before the printing operation, it may be arbitrarily performed by the user via the control terminal 18. Further, when the DC motor 221 is rotated, the rotation is also transmitted to the winding side gear train 225, but since the backlash also exists in the winding side gear train 225, the winding core 63 is similar to the platen side gear train 224. Will not rotate.

<How to remove play before starting printing (modification)>
The control method (play removal step) of the transport driving device 22b by the control device of the tape printer 1 described above is based on backlash of the platen side gear train 224 and the like by controlling the time for applying the normal voltage to the DC motor 221. The play (gap) is removed, but the play may be removed by changing (lowering) the voltage applied to the DC motor 221 instead. Only the differences from the play removal process by time control will be described below.

  In this case, in the play removal step, a low drive voltage (less than half the normal voltage) that does not rotate the platen roller 22a is applied to the DC motor 221 and is rotated slightly to remove the play (FIG. 7 ( b1)).

  In this case, when the play (gap) based on the backlash is in the forward direction, the driving force of the DC motor 221 causes each gear 223, 226, 227 to move in the forward direction (gap) as shown in FIG. 7 (b2). Rotate in the direction to eliminate When the tooth surfaces between the gears 223, 226, and 227 come into contact with each other and the rotation load of the gears 223, 226, and 227 is increased by any detection method, the DC motor 221 stops (FIG. 7). (Time indicated by (a)).

  On the other hand, when there is play (gap) based on backlash in the reverse direction, the voltage applied to the DC motor 221 is low as shown in FIG. 7 (b3), and the gears 223, 226, 227 and the platen roller 22a rotate. Since the energy required for the operation cannot be obtained, the gears 223, 226, 227 and the platen roller 22a do not rotate.

  Then, after the play removal step (after the time shown in FIG. 7A), the DC motor 221 is rotated to perform the printing process, and the platen roller 22a is rotated forward (see FIG. 7B4).

  According to the above configuration, since the DC motor 221 is driven at a low voltage that does not rotate the platen roller 22a, the same control is performed regardless of the direction in which the tooth surfaces of the gears 223, 226, and 227 are in contact with each other. Play based on backlash can be easily removed.

<Position shift prevention method by cutting resistance>
In this tape printer 1, the print tape 32 for which the printing process has been completed is cut by the cutter mechanism 23 in a state where printing is interrupted, and is discharged to the outside from the sheet discharge port 20. However, when the printing tape 32 is cut by the cutter mechanism 23, the printing tape 32 is pulled in the direction of the cutter mechanism 23 (downstream side) due to the cutting resistance, so that the play in the reverse direction based on the backlash of the platen side gear train 224 is obtained. As a result, the platen roller 22a rotates slightly forward. For this reason, the thermal head 521 faces a position shifted upstream of the stop position with respect to the print tape 32. When printing is resumed in this state and the next line is printed, a print omission (dot omission) occurs in a line shape with the line printed before stopping.

  Therefore, in the tape printer 1 according to the present embodiment, the printing process is interrupted, and the relative position between the thermal head 521 and the printing tape 32 is prevented from occurring when the printing tape 32 is cut by the cutter mechanism 23. The transport driving device 22b is controlled.

  With reference to FIG. 8, the control method of the tape printer 1 which concerns on this embodiment is demonstrated. FIG. 8A is a flowchart of the printing interruption process S0, and FIG. 8B is a graph showing the relationship between the rotational speed of the DC motor 221 and time.

  As shown in FIG. 8A, the control method by the control device of the tape printing apparatus 1 interrupts the printing operation to cut the printing tape 32, and resumes the interrupted printing operation after the cutting. In step S0, immediately after the printing operation is interrupted, the DC motor 221 is finely driven in the reverse direction to remove the play in the reverse direction based on the backlash of the platen side gear train 224 without rotating the platen roller 22a. Immediately before performing the reverse play removal step S1, the cutting step S2 for driving the cutter mechanism 23 after the reverse play removal step S1 and cutting the printing tape 32, and immediately before restarting the printing operation after performing the cutting step S2. Then, the DC motor 221 is slightly driven in the forward rotation direction to rotate the platen side gear train 224 without rotating the platen roller 22a. A forward play removal step S3 of removing the forward direction of the play based on the crash, and a.

  In the reverse direction play removal step S <b> 1, the play in the reverse direction is removed by performing stop control to apply the drive voltage in the reverse direction to the DC motor 221. Note that the rotational drive of the DC motor 221 during the printing process and in the reverse play removal step S1 (stop control) is controlled by PWM control.

  Specifically, as shown in FIG. 8B, the control device of the tape printer 1 inputs a reverse rotation signal from a state where the DC motor 221 is rotating forward (during printing processing). Thereby, the forward rotation speed of the DC motor 221 can be reduced in a short time. Along with this, the forward rotation speed of the platen roller 22a that rotates via the platen side gear train 224 also decreases. Note that the reverse rotation signal means that the current flow is reversed from that during forward rotation.

  If the reverse rotation operation by the reverse rotation signal continues, the forward rotation of the DC motor 221 (and the platen roller 22a) will eventually stop. In this state, the worm wheel gear 223, the platen input gear 226 and the platen output gear 227 constituting the platen side gear train 224 are in contact with the tooth surfaces in the forward rotating direction. That is, play (gap) based on backlash occurs in the reverse direction.

  The controller of the tape printer 1 continues the reverse operation even after the forward rotation of the DC motor 221 (and the platen roller 22a) is stopped. Thereby, the DC motor 221 starts reverse rotation. The reverse rotation is performed in order to eliminate play in the reverse rotation direction based on the backlash of the platen side gear train 224 within a range in which the platen roller 22a is not rotated. In the present embodiment, the input time of the reverse rotation signal (reverse rotation time) is 16.5 msec.

  Thereafter, the control device of the tape printer 1 inputs a brake signal to the DC motor 221. Thereby, the reverse rotation of the DC motor 221 is stopped. The brake signal is a so-called short brake. The brake operation time by the brake signal in this embodiment is 100 msec. The amount of rotation until the DC motor 221 stops in this embodiment is equivalent to about 11 dots in the printing process by the thermal head 521.

  In this state, the gears 223, 226, and 227 have no play in the reverse rotation direction, and play is generated in the normal rotation direction. Thereby, it is possible to prevent the platen roller 22a from slightly rotating in the range of play in the reverse direction by the cutting operation (cutting resistance) of the printing tape 32 performed by the cutter mechanism 23 performed thereafter.

  Next, the control device of the tape printer 1 performs the cutting step S2. In the cutting step S2, the printing tape 32 is cut and the printing tape 32 (label) cut from the sheet discharge port 20 is discharged.

Next, the control device of the tape printer 1 performs the forward play removal step S3.
As a result, the gears 223, 226, and 227 have no play in the forward rotation direction and play in the reverse rotation direction, so that the idle rotation of the DC motor 221 and the platen side gear train 224 can be prevented. The roller 22a can be accurately rotated. Note that the procedure of the forward play removal step S3 is the same as the play removal method (play removal process) before the start of printing described above or a modified example thereof, and thus the description thereof is omitted.

  According to the above configuration, the play in the reverse direction based on the backlash of the platen side gear train 224 is removed immediately after the printing operation is interrupted in the reverse play removal step S1, and the forward play is removed after the cutting step S2. In step S3, play in the forward rotation direction is removed immediately before resuming the printing operation. Thereby, it is possible to prevent the platen roller 22a from rotating slightly by the play in the reverse direction by the cutting operation of the printing tape 32 by the cutter mechanism 23 performed in the cutting step S2. Further, by preventing the idling of the DC motor 221 and the platen side gear train 224 and accurately rotating the DC motor 221, it is possible to maintain good print quality.

  The control method (print interruption step S0) of the tape printer 1 is automatically performed by the control device, but may be arbitrarily performed by the user via the control terminal 18.

  In addition, this invention is not limited to embodiment mentioned above at all, In the range which does not deviate from the summary, it can implement with a various form.

  DESCRIPTION OF SYMBOLS 1: Tape printer, 10: Apparatus main body case, 12: Tape cartridge, 15: Cover case, 17: Ribbon cartridge, 18: Control terminal, 20: Sheet discharge port, 21: Tape mounting part, 22: Tape conveyance mechanism, 22a: Platen roller, 22b: Transport drive device, 23: Cutter mechanism, 24: Tape detection mechanism, 31: Cartridge case, 32: Printing tape, 33: Tape core, 34: Shaft holder, 35: Body case, 51: Ribbon mounting Part, 62: feeding core, 63: winding core, 64: ribbon case, 221: DC motor, 224: platen side gear train, 521: thermal head

Claims (5)

A control method of a drive device comprising: a motor as a power source; an operation target that is operated by the motor; and a gear train that transmits power of the motor to the operation target.
A play removing step of removing play based on backlash of the gear train without causing the motor to be driven by operating the motor minutely prior to the operation of the operation target. Control method of drive device. In the play removal step,
2. The method of controlling a driving device according to claim 1, wherein the play is removed by slightly rotating the motor with a driving voltage when the operation target is operated and inertially rotating the motor. In the play removal step,
The method for controlling a driving device according to claim 1, wherein the play is removed by slightly rotating the motor with a low driving voltage that does not operate the operation target. A motor as a power source,
An object to be actuated by the motor;
A gear train for transmitting the power of the motor to the operation target;
Control means for controlling the motor,
The control means causes the motor to be finely driven prior to the operation of the operation target, and removes play based on backlash of the gear train without operating the operation target. . A tape feeding device having a feeding roller for feeding a printing tape, and a print head for printing on the printing tape,
A tape printing apparatus that performs forward feeding of the printing tape in synchronization with driving of the printing head after reversely feeding the front end of the set printing tape to the vicinity of the printing head,
The control method of the drive device according to any one of claims 1 to 3, wherein the feed roller is the operation target and the tape feed device is the drive device, and is implemented immediately before the forward feed. Tape printer to be used.

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