JP2008285273A - Control method of belt driving mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method of a belt driving mechanism free to detect abnormal stoppage of a mobile body in high precision. <P>SOLUTION: This control method of the belt driving mechanism to carry out an abnormal stoppage detection process to determine it as abnormal stoppage of a media tray 51 in the case when a driving electric current value to a tray motor 124 exceeds a threshold value when the belt driving mechanism 100 on which a tray belt 113 is wound around a tray driving pulley 111 to be rotated by a tray motor 124 and a tray driven pulley 112 supported free to rotate and to move the media tray 51 by travelling of the tray belt 113 by rotation of the tray driving pulley 111 works sets a threshold value found from a driving electric current in normal movement of the media tray 51 at the time when working by previous belt driving is finished as the threshold value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for controlling a belt drive mechanism having a timing belt wound around a drive pulley and a driven pulley.

In recent years, there have been known media processing devices such as a disc dubbing device for writing data on a large number of blank CDs and DVDs and a CD / DVD publisher capable of producing and issuing media by performing data writing and label printing. It has been. This type of media processing apparatus includes a drive that writes data to the media and a printer that prints on the label side of the media.
This type of media processing apparatus is a belt drive in which a timing belt is wound around a driving pulley and a driven pulley, and the tray is fixed to the timing belt in order to horizontally move a tray on which a medium is placed by a printer or a drive. Some have a mechanism (see, for example, Patent Document 1).

US Pat. No. 5,927,208

By the way, if the tray, which is a moving body, stops moving abnormally, for example, because it interferes with a foreign object such as a disk that has been accidentally dropped by the user, the abnormality is detected by an encoder provided on the drive pulley. When the timing belt skips with respect to the pulley, the drive pulley rotates even though the tray is stopped, so that the abnormal stop state of the tray is not detected by the encoder.
In this case, it may be possible to detect an abnormality from an increase in the current value to the drive motor. It was difficult to reliably detect an abnormal stop of the tray movement.

  Accordingly, an object of the present invention is to provide a method for controlling a belt drive mechanism that can detect an abnormal stop of a moving body with high accuracy.

  In the belt driving mechanism control method according to the present invention, which can solve the above-described problems, a timing belt is wound around a driving pulley rotated by a driving source and a driven pulley rotatably supported. When the belt drive mechanism that moves the moving body by running the timing belt by rotation is performed, an abnormal stop detection process is performed to determine that the moving body is abnormally stopped when the drive current value to the drive source exceeds a threshold value. A method for controlling a belt driving mechanism, characterized in that a threshold value obtained from a driving current during normal movement of the movable body at the end of a previous belt driving operation is set as the threshold value.

  According to the control method of the belt drive mechanism, the threshold value obtained from the drive current during normal movement of the moving body at the end of the previous work is used, and the movement is performed when the drive current value to the drive source exceeds the threshold value. Since the abnormal stop detection process for determining the abnormal stop of the body is performed, even if the timing belt skips the pulley, it is possible to reliably detect the abnormal stop of the moving body with high accuracy. Especially when the threshold value is set in consideration of individual differences in the drive motor and mechanism part to detect the abnormal stop using the threshold value obtained from the drive current during normal movement of the moving object at the end of the previous work. The threshold value can be set as small as possible. Thus, even if the mechanism generates tooth skipping with a low torque, the abnormal stop of the moving body can be detected reliably and with high accuracy.

  A measurement drive current detection process for detecting a measurement drive current value by moving the mobile body; a work drive current calculation process for obtaining a work drive current value during movement of the mobile body from the measurement drive current value; , A work abnormal stop detection threshold value calculation process for obtaining a work abnormal stop detection threshold value obtained by adding an offset value to the work drive current value, and a work abnormal stop detection for detecting an abnormal stop of the moving body during work by the work abnormal stop detection threshold value As a threshold for determining the abnormal stop of the moving body during the measurement drive current detection process, and obtained from the drive current at the time of normal movement of the moving body at the end of the work by the previous belt drive It is preferable to use a work abnormal stop detection threshold.

  According to this belt drive mechanism control method, while detecting the abnormal stop in the measurement drive current detection process using the threshold value obtained from the drive current during the normal movement of the moving body at the end of the previous work, From the measurement drive current value obtained by the measurement drive current detection process, a work drive current value at the time of movement of the moving body is obtained, and an abnormal work stop detection threshold value obtained by adding an offset value to the work drive current value is obtained. Since the abnormal stop is detected in the measurement drive current detection process, the measurement drive current value is obtained in a normal state, and accordingly, the work drive current value and the work abnormal stop detection threshold can be appropriately obtained. In order to detect an abnormal stop of the moving body during work based on this work abnormal stop detection threshold, the abnormal stop of the moving body is detected with high accuracy with a more appropriate threshold corresponding to the moving speed of the moving body during work. can do.

  Furthermore, it is preferable that the work drive current calculation process obtains the work drive current value for each moving speed that is different for each work.

  According to the control method of the belt drive mechanism, the work drive current value is obtained for each moving speed that is different for each type of work. Therefore, each work abnormal stop detection threshold can be appropriately obtained from each work drive current value. Thus, it is possible to detect an abnormal stop of the moving body with high accuracy in each operation at different speeds.

Embodiments of a belt drive mechanism and a media processing apparatus including the belt drive mechanism according to the present invention will be described below with reference to the drawings.
In the present embodiment, a media processing apparatus including a publisher will be described as an example.
1 is an external perspective view of the publisher (media processing apparatus), FIG. 2 is a front perspective view of the publisher with the case removed, and FIG. 3 is a rear perspective view of the publisher with the case removed. FIG. 3 is a perspective view of a label printer portion installed in a publisher.

  The publisher 1 is a media processing apparatus that writes data on a disk-shaped medium such as a CD or DVD and prints on the label surface of the medium, and includes a substantially rectangular parallelepiped case 2. Opening and closing doors 3 and 4 that can be opened and closed to the left and right are attached to the front surface of the case 2. An operation surface 5 on which display lamps, operation buttons, and the like are arranged is provided at the upper left end of the case 2, and a media discharge port 6 is provided at the lower end of the case 2.

The open / close door 3 on the right side of the front view is a door that opens and closes when an unused blank medium MA is set or when a created medium MB is taken out.
The open / close door 4 on the left side when viewed from the front is for opening and closing when the ink cartridge 12 of the label printer 11 is replaced. When the open / close door 4 is opened, the open / close door 4 has a plurality of cartridge holders 13 arranged in the vertical direction. The cartridge mounting portion 14 (see FIG. 2) is exposed.

  As shown in FIG. 2, a blank media stacker 21 as a media storage unit capable of stacking a plurality of unused blank media MA that has not been subjected to data writing processing is provided in the case 2 of the media processing device 1. Then, the created media stacker 22 as a media storage unit in which the created media MB is stored is arranged vertically in a coaxial state. The blank media stacker 21 and the created media stacker 22 are detachable from the predetermined positions shown in FIG.

  The blank media stacker 21 is provided with a pair of left and right arc-shaped frame plates 24 and 25, thereby allowing the blank media MA to be received from above and stored in a coaxially stacked state. The operation of storing or replenishing the blank media MA in the blank media stacker 21 can be easily performed by opening the door 3 and taking out the stacker.

  The created media stacker 22 on the lower side has the same structure, and includes a pair of left and right arc-shaped frame plates 27 and 28. By this, the created media MB is received from the upper side and stacked in a coaxial manner. A stackable stacker is configured.

  Further, the created media MB (that is, the medium on which data writing and label surface printing have been completed) can be taken out from the open / close door 3.

  A media transport mechanism 31 is disposed behind the blank media stacker 21 and the created media stacker 22. The media transport mechanism 31 has a vertical guide shaft 35 provided vertically on a horizontal support plate portion 34 attached to a base 72. A transport arm 36 is supported on the vertical guide shaft 35 so as to be able to move up and down and turn. The transport arm 36 can be moved up and down along the vertical guide shaft 35 by a drive motor 37 and can be swung left and right about the vertical guide shaft 35. The media transported to the media discharge port 6 by the media transport mechanism 31 can be taken out from the media discharge port 6.

Two media drives 41 that are stacked one above the other are disposed on the sides of the upper and lower stackers 21 and 22 and the media transport mechanism 31, and a carriage 62 (described later) of the label printer 11 is disposed below these media drives 41. 4) is movably arranged.
The media drive 41 has media trays 41a that can move between a data writing position on the media and a media delivery position for receiving and delivering media.

  The label printer 11 also has a media tray 51 that can move between a label printing position on the label surface of the media and a media delivery position for receiving and delivering the media.

  2 and 3, the media tray 41a of the upper media drive 41 is pulled out to the front and is in the media delivery position, and the media tray 51 of the lower label printer 11 is in the back label printable position. It is shown. The label printer 11 is an ink jet printer, and ink cartridges 12 of various colors (black, cyan, magenta, yellow, light cyan, and light magenta in this embodiment) are used as the ink supply mechanism 71, and these ink cartridges are used. 12 is mounted on each cartridge holder 13 of the cartridge mounting section 14 from the front.

  Here, between the pair of left and right frame plates 24 and 25 of the blank media stacker 21 and between the pair of left and right frame plates 27 and 28 of the created media stacker 22, the transport arm 36 of the media transport mechanism 31 can be raised and lowered. A gap is formed. Further, there is a gap between the upper and lower blank media stackers 21 and the created media stacker 22 so that the transport arm 36 of the media transport mechanism 31 can be rotated horizontally and positioned directly above the created media stacker 22. Is open. Further, when the media tray 41a is pushed into the media drive 41, the transport arm 36 of the media transport mechanism 31 is lowered to access the media tray 51 at the media delivery position. Therefore, the media can be transported to each part by a combined operation of raising and lowering the transport arm 36 and turning left and right.

  Below the media delivery position of the media tray 51, a disposal stacker 52 for storing the disposal media MD is arranged. For example, about 30 disposal media MD are stored in the disposal stacker 52. It is possible. With the media tray 51 retracted from the media delivery position above the discard stacker 52 to the data writing position, the discard media MD can be supplied to the discard stacker 52 by the transport arm 36 of the media transport mechanism 31. .

  With such a configuration, a medium M (hereinafter collectively referred to as a medium M) that is a CD or a DVD is a blank media stacker 21, a created media stacker 22, a disposal stacker 52, a media tray 41a of a media drive 41, and a label. The paper is transported between the media trays 51 of the printer 11 by the transport arm 36 of the media transport mechanism 31.

Next, the configuration of the label printer 11 will be described.
As shown in FIGS. 2 to 4, the label printer 11 includes a carriage 62 having an ink jet head 61, and this carriage 62 is supported along a carriage guide shaft 63 so as to be reciprocally movable in the horizontal direction. Yes. The carriage 62 includes a carriage belt 64 that is a timing belt that extends horizontally along the carriage guide shaft 63, and a carriage motor 65 that drives the carriage belt 64. A flexible ink supply tube 73 connected to the ink supply mechanism 71 is connected to the carriage 62 of the label printer 11.

  The inkjet head 61 mounted on the carriage 62 has a nozzle surface facing downward, and the media tray 51 can reciprocate horizontally in the front-rear direction at the lower position of the inkjet head 61. The media tray 51 has a right end supported by a guide shaft 102 extending horizontally in the front-rear direction, and a left end supported by a guide rail 104 extending horizontally in the front-rear direction in a slidable state. . The drive mechanism for the media tray 51 is also configured to include a tray belt 113 that extends horizontally in the front-rear direction and a tray motor 124 for driving the tray belt 113.

The media tray 51 includes, on the upper surface of a rectangular plate, a low circular convex portion 51a that abuts the outer peripheral end surface of the media and restricts the movement of the media M.
Moreover, the center part of this convex part 51a is equipped with the three vertical nail | claws (illustration omitted) arrange | positioned on the concentric circle at intervals of 120 degree | times. The three vertical claws can move together in the radial direction, and when the media tray 51 moves to the media delivery position, it moves inward in the radial direction by a cam mechanism (not shown).

  When the medium M is dropped into the convex portion 51a from above with the label surface facing upward at the media delivery position, three vertical claws are inserted into the center hole of the media. Thereafter, when the tray motor 124 is driven to move the media tray 51 to the rear side (the right rear side in FIG. 4) along the guide shaft 102, the three vertical claws are moved in the radial direction by the action of the cam. The three vertical claws are pressed against the inner peripheral surface of the center hole of the media from the inside. As a result, the medium M is held on the media tray 51. If the media tray 51 is moved into the printing area of the inkjet head 61, the inkjet head 61 can perform predetermined printing on the label surface of the media.

Next, a belt driving mechanism that moves the media tray 51 will be described.
FIG. 5 is a schematic plan view of the belt drive mechanism, and FIG. 6 is a schematic side view of the belt drive mechanism.
The media tray 51 moved by the belt driving mechanism 100 is arranged such that a guide shaft 102 extending horizontally in the front-rear direction of the apparatus passes through a slide bearing 101 provided on one side of the media tray 51, and on the other side. The provided slide piece 103 is slidably mounted on a guide rail 104 extending in the front-rear direction of the apparatus. Thus, the media tray 51 is supported by the guide shaft 102 and the guide rail 104 so as to be slidable in the front-rear direction of the apparatus.

The guide shafts 102 are arranged at intervals along a frame 105 disposed in the front-rear direction of the apparatus, and both ends thereof are fixed to fixing plates 106 provided at both ends of the frame 105.
A tray driving pulley (driving pulley) 111 is rotatably provided in the vicinity of the end portion on the rear side of the apparatus on the frame 105, and a tray driven pulley (driven pulley) 112 is rotatable in the vicinity of the end section on the front side of the apparatus. Is provided. A tray belt 113 as a timing belt is wound around the tray driving pulley 111 and the tray driven pulley 112, and one side portion of the media tray 51 is fixed to the tray belt 113 by a belt clamp 114. ing. Thereby, the media tray 51 is slid along the traveling direction when the tray belt 113 travels.

  An encode plate 122 and a transmission pulley 123 are fixed to the rotating shaft 121 of the tray drive pulley 111. A tray motor 124 is provided below the frame 105, and a motor pulley 126 is provided on the drive shaft 125 of the tray motor 124. A motor belt 127 that is a timing belt is wound around the transmission pulley 123 and the motor pulley 126. In the running of the motor belt 127, the motor pulley 126 functions as a driving pulley, and the transmission pulley 123 functions as a driven pulley.

  A plurality of position detection slits are formed at equal intervals along the periphery of the encode plate 122, and a position detector (not shown) detects the position detection slits of the encode plate 122. . The position of the media tray 51 can be detected based on the detection signal from the position detector.

  In the belt drive mechanism 100, when a drive current having a current value obtained based on PID control in a control unit (not shown) provided in the label printer 11 or the publisher 1 is output to the tray motor 124, The tray motor 124 is driven and the drive shaft 125 is rotated. Then, the rotational force of the drive shaft 125 is transmitted to the rotation shaft 121 of the tray drive pulley 111 by the motor belt 127 wound around the motor pulley 126 and the transmission pulley 123, and the tray drive pulley 111 is rotated. When the tray driving pulley 111 is thus rotated, the tray belt 113 wound around the tray driving pulley 111 and the tray driven pulley 112 travels, whereby the media tray 51 fixed to the tray belt 113 is moved to the apparatus. Is moved in the front-rear direction.

Here, in the belt drive mechanism 100 according to the above embodiment, when the media tray 51 interferes with a foreign object such as the media M dropped by the user and stops abnormally, the control unit outputs the abnormal stop to the tray motor 124. The current value is detected by monitoring.
Next, the control at the time of abnormal stop of the media tray 51 by this control unit will be described with reference to the flowchart shown in FIG.

When the publisher 1 is turned on, measurement drive current detection processing is first performed (step S01). In this measurement drive current detection process, the media tray 51 is moved at two different speeds, and a measurement drive current value consisting of the current integration value at that time is obtained.
At this time, a measurement operation abnormal stop detection process (abnormal stop detection process) is performed to detect whether or not an abnormal stop has occurred during the movement of the media tray 51 at two speeds during the measurement drive current detection process ( Step S02).

In step S02, specifically, the measurement drive current value at each movement is a work abnormal stop detection threshold (to be described later) obtained from the drive current at the normal movement of the media tray 51 at the end of the previous work of the label printer 11. Judgment is made based on whether or not the number is exceeded.
If it is determined that an abnormal stop has occurred during the measurement drive current detection process, the supply of drive current to the tray motor 124 is stopped, the media tray 51 is stopped, and an abnormal stop has occurred to the user. An error is displayed to inform you.

  When the publisher 1 is powered on for the first time after product shipment, the initial threshold value set as the default value at the time of shipment is used, and the measurement drive current value when the media tray 51 is moved is the default. Judgment is made based on whether or not the initial threshold value is exceeded.

Next, based on the measurement drive current value obtained by the movement at the two speeds, the drive current at each movement speed during various operations (printing on the medium, delivery of the medium, etc.) of the media tray 51 by proportional calculation. A work drive current value that is a value is obtained (work drive current calculation process: step S03).
Then, an offset value of a current determined in advance is added to the work drive current value at each moving speed at each work, and this current value is set as a work abnormal stop detection threshold (work abnormal stop detection threshold calculation process: step) S04).

Thereafter, by performing each operation, the media tray 51 is moved at a moving speed corresponding to each operation (step S05).
At this time, the drive current value of the tray motor 124 is monitored, the integrated value of the drive current is compared with the abnormal work stop detection threshold value, and if the integrated drive current value exceeds the abnormal work stop detection threshold value, the media tray 51, for example, determines that the user has stopped abnormally by interfering with a foreign matter such as media M dropped by the user (work abnormal stop detection process (abnormal stop detection process): step S06).
If it is determined that the abnormal stop has occurred in this way, the supply of drive current to the tray motor 124 is stopped, the media tray 51 is stopped (step S07), and an abnormal stop has occurred to the user. An error is displayed for notification (step S08).

  In the above control, if the moving distance of the media tray 51 is very small, the drive current value of the tray motor 124 may not reach the abnormal operation stop detection threshold even if the media tray 51 is abnormally stopped. In this case, after the drive of the tray motor 124 is stopped, the media tray 51 is slightly returned from the abnormal stop position and displaced. Therefore, when such a movement distance is very small, the position at the end of movement and the position at the start of the next movement are detected by the encoder, and if there is a positional deviation between them, it is determined that the media tray 51 has stopped abnormally. .

  As described above, according to the belt drive mechanism 100, the drive current to the tray motor 124 is determined using the work abnormal stop detection threshold value obtained from the drive current during normal movement of the media tray 51 at the end of the previous work. When the value exceeds the abnormal work stop detection threshold, it is determined that the media tray 51 has stopped abnormally. Even if the tray belt 113 jumps out of the tray drive pulley 111, the media tray 51 is surely abnormal. A stop can be detected with high accuracy. In particular, in order to detect an abnormal stop using a work abnormal stop detection threshold obtained from the drive current during normal movement of the media tray 51 at the end of the previous work, the individual difference of the tray motor 124 and the mechanism portion is taken into consideration. Therefore, the threshold value can be set as small as possible, so that the abnormal stop of the media tray 51 can be detected reliably and accurately even in a mechanism in which tooth skipping occurs with a low torque. be able to.

  Also, abnormal stop detection (abnormal stop detection process during measurement operation) is detected in the measurement drive current detection process using the work abnormal stop detection threshold obtained from the drive current during normal movement of the media tray 51 at the end of the previous work. Therefore, the measurement drive current value can be obtained in a normal state other than the abnormal stop. From the appropriate measurement drive current value obtained by this measurement drive current detection process, the work drive current value during movement of the media tray 51 can be obtained appropriately, and an offset value is added to the work drive current value. The detected abnormal work stop detection threshold can be obtained appropriately. Since the abnormal stop of the media tray 51 during the operation is detected based on this abnormal operation stop detection threshold, the abnormality of the media tray 51 can be detected with high accuracy with a more appropriate threshold corresponding to the moving speed of the media tray 51 during the operation. A stop can be detected.

  Furthermore, since the work drive current value is obtained for each moving speed that differs for each type of work, the respective work abnormal stop detection threshold values can be appropriately obtained from the respective work drive current values. Thus, the abnormal stop of the media tray 51 can be detected with high accuracy.

It is an external appearance perspective view of a publisher (media processing apparatus). It is a perspective view of the front side of the state which removed the case of the publisher. It is a perspective view of the back side of the state which removed the case of the publisher. It is a perspective view of the recording device part installed in the publisher. It is a schematic plan view of a belt drive mechanism. It is a flowchart which shows the flow of control of a belt drive mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Publisher (media processing apparatus), 51 ... Media tray (moving body), 61 ... Inkjet head (processing part), 100 ... Belt drive mechanism, 111 ... Tray drive pulley (drive pulley), 112 ... Tray driven pulley (driven) Pulley), 113 timing belt (belt), 124 tray motor (drive source), M medium.

Claims (3)

A timing belt is wound around a driving pulley that is rotated by a driving source and a driven pulley that is rotatably supported, and the belt driving mechanism that moves the moving body by running of the timing belt by the rotation of the driving pulley, A control method for a belt drive mechanism that performs an abnormal stop detection process for determining an abnormal stop of the moving body when a drive current value to the drive source exceeds a threshold,
A control method for a belt drive mechanism, wherein a threshold value obtained from a drive current during normal movement of the movable body at the end of the previous belt drive operation is set as the threshold value. It is a control method of the belt drive mechanism according to claim 1,
A measurement drive current detection process for detecting a measurement drive current value by moving the movable body;
A work drive current calculation process for obtaining a work drive current value during movement of the mobile body from a measurement drive current value; and
Work abnormal stop detection threshold value calculation processing for obtaining a work abnormal stop detection threshold value obtained by adding an offset value to the work drive current value;
A work abnormal stop detection process for detecting an abnormal stop of the moving body during work by the work abnormal stop detection threshold,
As a threshold value for determining the abnormal stop of the moving body during the measurement drive current detection process, an abnormal operation stop detection threshold value obtained from the drive current at the time of normal movement of the moving body at the end of the work by the previous belt drive. A control method of a belt drive mechanism, characterized by being used. It is a control method of the belt drive mechanism according to claim 2,
The method for controlling a belt drive mechanism, wherein the work drive current calculation processing obtains the work drive current value for each moving speed that is different for each work.

Images