JP5653170B2 - Printing device - Google Patents

Description

  The present invention relates to a printing apparatus that prints on a print medium based on an image read from a document.

  In general, after stencil stencil paper is wound around a rotating drum, printing paper is fed to this drum, and printing is performed by pressing the supplied printing paper against the drum with a press roller while rotating the drum. A stencil printing apparatus is well known (for example, Patent Document 1).

  Further, Patent Document 2 includes a motor that rotates a rotating member and a rotation speed detection pulse generator that generates a rotation speed detection pulse corresponding to the rotation speed of the motor, and the rotation speed detection pulse is within a maximum allowable time. If the number of the motors is less than the set number of pulses, there has been proposed a motor abnormal stop device that determines that the motor rotation is abnormal.

JP 2010-036398 A JP 2001-145380 A

  However, when the motor abnormal stop device described in Patent Document 2 is applied to the stencil printing apparatus described in Patent Document 1, the rotational speed that generates a rotational speed detection pulse corresponding to the rotational speed of the motor that rotates the drum. A detection pulse generator is provided, and if the number of rotation speed detection pulses is less than the set number of pulses within the maximum allowable time, it is determined that the motor rotation is abnormal, so it must take more time than the maximum allowable time to determine. In particular, when the drum was rotating at high speed, the motor was rotating a considerable number of times in an abnormal state.

  Further, if the maximum allowable time is set according to the rotational speed of the drum, there is a problem that the processing becomes complicated because it is necessary to consider the case where the rotational speed is changed.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a printing apparatus that detects an abnormality related to rotation of a drum quickly and appropriately with simple processing.

  In order to achieve the above object, a first feature of a printing apparatus according to the present invention includes a drum on which a stencil sheet is wound, and presses a print medium while rotating the drum by driving a motor. Printing means for printing on a print medium; pulse signal output means for outputting a pulse signal at a constant period when the motor rotates; reference position detection means for detecting a reference position serving as a reference point on the circumference of the drum; By the reference position detecting means until the rotation angle of the drum calculated based on the number of pulse signals output by the pulse signal output means reaches a target angle that is a target rotation angle of the drum. And an abnormality determining means for determining that an abnormality relating to the rotation of the drum has occurred when the number of times the reference position has been detected reaches a predetermined number.

  A second feature of the printing apparatus according to the present invention is that the printing apparatus further includes a number-of-times determining means for determining the predetermined number of times according to the target angle.

  According to the first feature of the printing apparatus according to the present invention, the rotation angle of the drum calculated based on the number of pulse signals output by the pulse signal output means is a target angle that is a target rotation angle of the drum. If the number of times that the reference position is detected by the reference position detection means reaches a predetermined number of times until it reaches, it is determined that an abnormality relating to the rotation of the drum has occurred. Abnormalities relating to rotation can be detected.

  According to the second feature of the printing apparatus according to the present invention, since the predetermined number of times is determined according to the target angle, even when the processing load of the control unit is high, an abnormality related to the rotation of the drum is detected quickly and appropriately. can do.

It is an apparatus block diagram which shows the hardware constitutions of the stencil printing apparatus which is Example 1 of this invention. It is a functional block diagram which showed the functional structure of the stencil printing apparatus which concerns on Example 1 of this invention. It is the flowchart which showed the processing flow of the stencil printing apparatus which is Example 1 of this invention. (A) is the figure which showed the reference position pulse signal of the state in which the reference position detection sensor with which the stencil printing apparatus which is Example 1 of this invention was equipped detects the reference position normally, (b) (A) is a figure which showed the pulse signal which the rotary encoder is outputting with the normal period, (c) showed the FG count value which is the integration value of the pulse signal output with the normal period by the rotary encoder. It is a figure, (d) is a figure showing the pulse signal which the rotary encoder is outputting with non-constant period (abnormal state), (e) is the figure where the rotary encoder is output with non-constant period (abnormal state) It is the figure which showed the FG count value which is an integrated value of the performed pulse signal. It is the flowchart which showed the processing flow of the stencil printing apparatus which is Example 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  In Embodiment 1 of the present invention, a stencil sheet is made based on an image read from an original, and a printing paper (printing medium) is pressed while rotating a drum around which the stencil sheet is made. A stencil printing apparatus for printing will be described as an example.

<Configuration of stencil printing machine>
A configuration of a stencil printing apparatus that is Embodiment 1 of the present invention will be described.

  FIG. 1 is an apparatus configuration diagram illustrating a hardware configuration of a stencil printing apparatus that is Embodiment 1 of the present invention.

  As shown in FIG. 1, the stencil printing apparatus 1 includes a plate making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharging unit 5 and a plate discharging unit 6.

  The plate making unit 2 is arranged at a position opposite to the thermal head 23, a base paper storage unit 22 that stores the rolled long stencil sheet 21, a thermal head 23 that is disposed downstream of the base paper storage unit 22, and the thermal head 23. The platen roll 24, a pair of base paper feed rolls 25 disposed downstream of the platen roll 24 and the thermal head 23, a light pulse motor 26 for rotating the platen roll 24 and the base paper feed roll 25, and a pair of A base paper cutter 27 disposed downstream of the base paper feed roll 25.

  The plate making unit 2 conveys the long stencil sheet 21 by the rotation of the platen roll 24 and the base paper feed roll 25, and each dot of the thermal head 23 based on the image data read by the image reading unit (not shown). When the heat generating element selectively generates heat, the stencil sheet 21 is thermally perforated to make a plate, and the stencil sheet 21 thus made is cut with a sheet cutter 27 to produce a stencil sheet 21 having a predetermined length.

  The printing unit 3 includes a drum 32 that rotates in the direction of arrow A in FIG. 1 by the driving force of the main motor 31, and a base paper clamp unit 33 that is provided on the outer peripheral surface of the drum 32 and clamps the tip of the stencil base paper 21. ing.

  The printing unit 3 includes a base paper confirmation sensor 34 that detects whether or not the stencil paper 21 is wound around the outer peripheral surface of the drum 32, a reference position detection sensor 35 that detects the reference position of the drum 32, and a main motor. And a rotary encoder 36 that outputs a pulse signal at a predetermined period in accordance with the rotation of 31. The rotation angle of the drum 32 can be calculated by detecting the output pulse signal of the rotary encoder 36 based on the detection output (reference position pulse signal) of the reference position detection sensor 35.

  Further, the printing unit 3 includes a press roll 37 disposed at a position below the drum 32. The press roll 37 is pressed against the outer peripheral surface of the drum 32 by the driving force of the solenoid unit 38. It is configured to be able to change between a standby position separated from the outer peripheral surface. The press roll 37 is shifted from the standby position to the pressing position in synchronization with the sheet feeding operation from the sheet feeding unit 4, and is positioned at the pressing position only when the printing paper 41 passes through the lower part of the drum 32. It is positioned at the standby position.

  Then, the leading end of the stencil sheet 21 conveyed from the plate making unit 2 is clamped by the stencil sheet clamping unit 33, and the drum 32 is rotated in this clamped state, and the stencil sheet 21 is wound around the outer peripheral surface of the drum 32. Then, the printing paper 41 fed from the paper feeding unit 4 in synchronization with the rotation of the drum 32 is pressed against the stencil paper 21 wound around the drum 32 by a press roll 37, whereby the stencil paper 21 is placed on the printing paper 41. An image is printed by transferring ink from the perforations.

  The paper feed unit 4 includes a paper feed tray 42 on which the print paper 41 is stacked, primary paper feed rolls 43 and 44 that transport only the uppermost print paper 41 from the paper feed base 42, and the primary paper feed. Between the pair of secondary paper feed rolls 45 and a pair of secondary paper feed rolls 45 that convey the printing paper 41 conveyed by the rolls 43 and 44 between the drum 32 and the press roll 37 in synchronization with the rotation of the drum 32. A paper feed sensor 46 that detects whether or not the print paper 41 has been transported, and a paper presence sensor 48 that detects the print paper 41 stacked on the paper feed tray 42. The rotation of the main motor 31 is selectively transmitted to the primary paper feed rolls 43 and 44 via a paper feed clutch 47.

  The paper discharge unit 5 includes a paper separation claw 51 that separates the printed print paper 41 from the drum 32, a paper discharge roller 52 that conveys the print paper 41 separated from the drum 32 by the paper separation claw 51, and this discharge A paper discharge motor 55 that drives the paper roller, a paper jam detection sensor 53 that detects whether or not the print paper 41 passes over the paper discharge roller 52, and the print paper 41 that is discharged by the paper discharge roller 52 are provided. And a paper discharge tray 54 to be placed.

  The paper discharge roller 52 is provided with a paper discharge fan 52 a that sucks the printing paper 41 toward the paper discharge roller 52 so that the paper discharge roller 52 can discharge the print paper 41.

  The paper jam detection sensor 53 detects whether or not the printing paper 41 printed by the printing unit 3 is correctly conveyed. If the paper jam detection sensor 53 does not detect the conveyance of the printing paper 41 even after a predetermined time has elapsed after printing, it is determined that the printing paper 41 remains in the printing unit 3.

  The plate discharging unit 6 guides the leading end of the stencil sheet 21 unclamped from the outer peripheral surface of the drum 32, and transports the guided stencil sheet 21 while being peeled off from the drum 32, and this plate discharging transport. A stencil box 62 for storing the stencil sheet 21 conveyed by the means 61 and a stencil compression member 63 for pushing the stencil sheet 21 conveyed into the stencil box 62 by the stencil conveying means 61 into the stencil box 62 are provided. Have.

  FIG. 2 is a functional configuration diagram illustrating a functional configuration of the stencil printing apparatus 1 according to the first embodiment of the present invention.

  As shown in FIG. 2, the stencil printing apparatus 1 according to the first embodiment of the present invention includes a storage unit 8, an operation unit 9, and a control unit 10.

  The storage unit 8 stores a reference position detection number indicating the number of times the reference position is detected by the reference position detection sensor 35, and an FG count value that is an integrated number of output pulse signals of the rotary encoder 36.

  The operation unit 9 is provided in the upper part of the stencil printing apparatus 1, and includes a start key for starting plate-making and printing, a stop key for stopping plate-making and printing, and a numeric keypad for inputting the number of prints (whichever And an operation signal based on a user operation is supplied to the control unit 10.

  The control unit 10 performs central control of the stencil printing apparatus 1.

  Moreover, the control part 10 is equipped with the apparatus control part 11, the abnormality determination part 12, and the output control part 13 on the function.

  The device control unit 11 is based on a task that is a predetermined unit process, and includes a plate making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharging unit 5, a paper discharging unit 6, and an operation unit 9. To control. This task includes, for example, a clamping operation task for clamping the stencil sheet 21 to the stencil sheet clamping unit 33 of the drum 32, and a cutting operation task for cutting the stencil sheet 21 with the stencil cutter 27. These tasks include predetermined tasks. When the condition is satisfied, here, the process is executed when the rotation angle of the drum 32 reaches a predetermined target angle.

  Therefore, the device control unit 11 needs to calculate the rotation angle of the drum 32. The device control unit 11 integrates the number of output pulse signals supplied from the rotary encoder 36 as an FG count value, and resets the FG count value to zero when the reference position detection sensor 35 detects the reference position. Thereby, the device control unit 11 calculates the rotation angle of the reference position when the position of the reference position detection sensor 35 on the circumference of the drum 32 is set to the 0 ° point position based on the FG count value.

  The device control unit 11 controls each device based on the rotation angle of the drum 32. For example, when the reference position is located at 101 shown in FIG. 2, that is, when the rotation angle is α (°), the base paper clamp unit 33 is positioned at the uppermost part of the drum. Based on the operation task, the stencil sheet 21 is conveyed to the stencil making unit 2 and the stencil sheet 21 is clamped to the stencil clamping unit 33.

  Further, when the reference position is positioned at 102 shown in FIG. 2, that is, when the rotation angle is β (°), the device control unit 11 removes the stencil sheet 21 with the base paper cutter 27 based on the cutting operation task. The plate making unit 2 is controlled so as to be cut.

  The abnormality determination unit 12 determines whether the rotation angle of the drum 32 calculated based on the number of pulse signals output from the rotary encoder 36 reaches the target angle that is the target rotation angle of the drum 31. When the number of times the reference position is detected by the detection sensor 35 reaches a predetermined number, that is, when the reference position is detected more than the number of times of abnormality determination, it is determined that an abnormality relating to the rotation of the drum 32 has occurred. The number of times of abnormality determination is a threshold value for determining whether or not an abnormality relating to the motor has occurred. Here, it is assumed that “2” is set.

  When the abnormality determination unit 12 determines that an abnormality related to the main motor 31 has occurred, the output control unit 13 causes the operation unit 9 to display that effect.

<Operation of Stencil Printing Apparatus 1>
Next, the operation of the stencil printing apparatus 1 that is Embodiment 1 of the present invention will be described.

  FIG. 3 is a flowchart showing a processing flow of the stencil printing apparatus 1 according to the first embodiment of the present invention. This process is executed every time the above-described task occurs.

  As shown in FIG. 3, when a task occurs, the abnormality determination unit 12 of the control unit 10 substitutes “0” for the value of the reference position detection number BC (step S101).

  Next, the abnormality determination unit 12 determines whether or not the value of the FG count has reached a value corresponding to the target angle (step S103). Here, the aim angle is a rotation angle of the drum 32 determined as a target for each task. For example, when the task to be executed next is a clamp operation task, the aim angle is “α” ( In the case of a cutting operation task, the target angle is “β” (°).

  In step S103, when it is determined that the value of the FG count has reached a value corresponding to the target angle (in the case of YES), the abnormality determination unit 12 determines whether or not the value of the FG count has been counted up. (Step S105).

  In step S105, when it is determined that the value of the FG count has not been continuously counted up for a predetermined time or more (in the case of NO), the abnormality determination unit 12 displays an abnormality related to the rotation of the drum 32 on the operation unit 9. Let Here, since it is estimated that an abnormality has occurred in the main motor 31 main body or the rotary encoder 36, the abnormality determination unit 12 informs the operation unit 9 that an abnormality has occurred in the main motor 31 main body or the rotary encoder 36. Display a notification message.

  On the other hand, when it is determined in step S105 that the value of the FG count has been counted up (in the case of YES), the abnormality determination unit 12 determines whether the value of the FG count is equal to or less than the count number corresponding to one revolution of the drum 32. It is determined whether or not (step S107).

  In step S107, when it is determined that the value of the FG count has exceeded the count corresponding to one revolution of the drum 32 (in the case of NO), the abnormality determination unit 12 causes the operation unit 9 to indicate an abnormality related to the rotation of the drum 32. Display. Here, since it is estimated that an abnormality has occurred in the main body of the main motor 31 or the reference position detection sensor 35, the abnormality determination unit 12 has detected an abnormality in the main body of the main motor 31 or the reference position detection sensor 35. Display a message notifying that it has occurred.

  On the other hand, when it is determined in step S107 that the value of the FG count is equal to or less than the count corresponding to one revolution of the drum 32 (in the case of YES), the abnormality determination unit 12 causes the reference position detection sensor 35 to set the reference position. It is determined whether or not it has been detected (step S109).

  When it is determined in step S109 that the reference position detection sensor 35 has detected the reference position (in the case of YES), the abnormality determination unit 12 substitutes “0” for the value of the FG count (step S111).

  Next, the abnormality determination unit 12 adds the value of the reference position detection number BC stored in the storage unit 8 by “1” (step S113), and then the value of the reference position detection number BC is “2”. It is determined whether or not this is the case (step S115).

  If it is determined in step S115 that the value of the reference position detection number BC is “2” or more (in the case of YES), the abnormality determination unit 12 causes the operation unit 9 to display an abnormality related to the rotation of the drum 32. (Step S117). The value of the reference position detection number BC is incremented by “1” every time the reference position is detected by the reference position detection sensor 35, that is, every time the drum 32 rotates once, so that all devices operate normally. In this case, the value of the reference position detection number BC does not become “2” or more without reaching the target angle of the drum 32. However, if the rotation abnormality of the main motor 31 has occurred or the rotary encoder 36 does not output a pulse signal at a normal cycle, the value of the reference position detection number BC may be “2” or more. is there. Therefore, the abnormality determination unit 12 causes the operation unit 9 to display a message notifying that an abnormality has occurred in the main motor 31 body or the rotary encoder 36.

  FIG. 4A is a diagram showing a reference position pulse signal in a state where the reference position detection sensor 35 provided in the stencil printing apparatus 1 according to the first embodiment of the present invention normally detects the reference position. (B) is the figure which showed the pulse signal which the rotary encoder 36 is outputting with a normal period, (c) is the integrated value of the pulse signal which the rotary encoder 36 was output with the normal period. It is the figure which showed the FG count value, (d) is the figure which showed the pulse signal which the rotary encoder 36 is outputting with the non-constant period (abnormal state), (e) is the figure where the rotary encoder 36 is non- It is the figure which showed the FG count value which is an integrated value of the pulse signal output with the fixed period (abnormal state).

  As shown in FIG. 4A, at time t1, t3, t5, and t7 when the drum 32 makes one rotation, the reference position detection sensor 35 detects the reference position and outputs a reference position pulse signal. As shown in FIG. 4B, an output pulse signal is output from the rotary encoder 36 at a constant cycle.

  As shown in FIG. 4C, when the reference position pulse signal is output from the reference position detection sensor 35, the device control unit 11 resets the FG count value to zero at time t3.

  As a result, when no abnormality has occurred in the main motor 31, the reference position detection sensor 35, and the rotary encoder 36, the device control unit 11 performs a rotary operation based on the reference position pulse signal output from the reference position detection sensor 35. By detecting the output pulse signal output from the encoder 36, the rotation angle of the drum 32 is accurately calculated.

  As shown in FIG. 4C, for example, when a cutting operation task occurs at time t10, the rotation angle of the drum 32 calculated based on the FG count value is the target angle “β” (° ) Is reached, the cutting operation task is executed. Thereby, the base paper cutter 27 can cut the stencil base paper 21 at an appropriate timing.

  However, as shown in FIGS. 4D and 4E, when the rotary encoder 36 outputs a pulse signal in an indefinite period (abnormal state), the FG count value corresponds to “β” (°). The reference position pulse signal is output by the reference position detection sensor 35 without reaching the number of output pulses, and the FG count value is reset to zero. As a result, the drum 32 continues to rotate without reaching the target angle no matter how many times it is retried.

  Therefore, in the stencil printing apparatus 1 according to the first embodiment of the present invention, the value of the reference position detection number BC, which is an integrated value of the reference position pulse signal output from the reference position detection sensor 35, is the number of abnormality determinations “2”. "When it becomes more than (at time t5), the abnormality determination unit 12 causes the operation unit 9 to display an abnormality.

  As described above, according to the stencil printing apparatus 1 which is Embodiment 1 of the present invention, when the value of the reference position detection number BC is “2” or more, an abnormality is displayed on the operation unit 9. A predetermined time margin is not required until an abnormality is detected, and an abnormality relating to the rotation of the drum 32 can be detected quickly and appropriately with a simple process.

  In the first embodiment of the present invention, when the value of the reference position detection number BC, which is an integrated value of the reference position pulse signal output from the reference position detection sensor 35, is equal to or greater than “2” that is the number of abnormality determinations, The stencil printing apparatus 1 in which the determination unit 12 causes the operation unit 9 to display an abnormality has been described as an example.

  In the second embodiment of the present invention, a stencil printing apparatus that changes the number of abnormality determinations according to the target angle will be described as an example. The configuration of the stencil printing apparatus that is Embodiment 2 of the present invention has the configuration shown in FIGS. 1 and 2, and the control unit 10 provided in the stencil printing apparatus that is Embodiment 2 of the present invention includes: In addition to the device control unit 11, the abnormality determination unit 12, and the output control unit 13, a number determination unit 14 is provided (not shown).

  The number-of-times determination unit 14 determines a predetermined number of times, that is, the number of times of abnormality determination, according to the target angle. For example, when the aim angle is large, the abnormality determination count is set to “3”, and when the aim angle is small, the abnormality determination count is set to “2”.

  FIG. 5 is a flowchart showing a processing flow of the stencil printing apparatus 1A according to the second embodiment of the present invention. Of the processes shown in the flowchart shown in FIG. 5, for the processes given the same step numbers as the steps shown in the flowchart of the stencil printing apparatus 1 that is Embodiment 1 of the present invention shown in FIG. 2, Since it is the same processing content, description is abbreviate | omitted.

  As shown in FIG. 5, when the value of the reference position detection number BC stored in the storage unit 8 is incremented by “1” in step S113, the number determination unit 14 determines whether the target angle is equal to or greater than the limit angle. Is determined (step S201). Here, the limit angle is an angle at which the device control unit 11 can stably detect that the target angle has been reached regardless of the load state of the control unit 10, for example, 355 (°). Set to

  When the processing load of the control unit 10 is high, a delay occurs in the process of detecting that the rotation angle of the drum 32 has reached the target angle, and when the target angle is close to the 0 ° point position, the position of the 0 ° point is at the delayed time. The FG count value may be reset to zero.

  For example, in the example shown in FIG. 2, when the target angle is “β” (°), the 0 ° point position is close, so the processing load on the control unit 10 is high, and the device control unit 11 is connected to the drum 32. Before it is determined that the rotation angle has reached β (°), the reference position may pass the 0 ° point position, and the FG count value may be reset to zero.

  In such a case, the reference position detection number BC is excessively counted, and it is determined that an abnormality has occurred even though the main motor 31, the reference position detection sensor 35, or the rotary encoder 36 is operating normally. May be.

  Therefore, the number determination unit 14 determines whether or not the aiming angle is close to the 0 ° point position, that is, whether or not the aiming angle is equal to or larger than the limit angle. Specifically, it is determined whether the number of target pulse signals corresponding to the target angle has reached the number of pulse signals corresponding to the limit angle.

  When it is determined in step S201 that the aim angle is less than the limit angle (in the case of NO), the number determination unit 14 sets the abnormality determination number to “2”, and the abnormality determination unit 12 determines the reference position detection number. It is determined whether or not the value of BC is equal to or greater than “2” which is the number of times of abnormality determination (step S115).

  On the other hand, when it is determined in step S201 that the aim angle is equal to or greater than the limit angle (in the case of YES), the number determination unit 14 sets the abnormality determination number to “3”, and the abnormality determination unit 12 It is determined whether or not the value of the number of detections BC is equal to or greater than “3” that is the number of times of abnormality determination (step S203).

  If it is determined in step S203 that the value of the reference position detection number BC is “3” or more (in the case of YES), an abnormality related to the rotation of the drum 32 is displayed on the operation unit 9 (step S117). Here, since it is presumed that the rotation abnormality of the main motor 31 main body has occurred or the rotary encoder 36 does not output a pulse signal at a normal cycle, the abnormality determination unit 12 causes the operation unit 9 to A message notifying that an abnormality has occurred in the motor 31 main body or the rotary encoder 36 is displayed.

  As described above, according to the stencil printing apparatus 1A that is Embodiment 2 of the present invention, when the target angle is equal to or larger than the limit angle, the number of times of abnormality determination is increased to “3”. Even when the load is high, an abnormality relating to the rotation of the drum 32 can be detected quickly and appropriately with a simple process.

DESCRIPTION OF SYMBOLS 1,1A ... Stencil printing apparatus 2 ... Plate making part 3 ... Printing part 4 ... Paper feed part 5 ... Paper discharge part 6 ... Plate discharging part 8 ... Memory | storage part 9 ... Operation part 10 ... Control part 11 ... Equipment control part 12 ... Abnormality determination Unit 13: Output control unit 14: Number of times determination unit 31 ... Drum 31 ... Main motor 32 ... Drum 35 ... Reference position detection sensor (reference position detection means)
36. Rotary encoder (pulse signal output means)

Claims (2)

A printing unit for printing on the printing medium by pressing the printing medium while rotating the drum by driving a motor, the drum having a stencil sheet wound thereon;
Pulse signal output means for outputting a pulse signal at a constant period when the motor rotates;
A reference position detecting means for detecting a reference position serving as a reference point on the circumference of the drum;
By the reference position detecting means until the rotation angle of the drum calculated based on the number of pulse signals output by the pulse signal output means reaches a target angle that is a target rotation angle of the drum. An abnormality determining means for determining that an abnormality relating to rotation of the drum has occurred when the number of times the reference position has been detected reaches a predetermined number of times;
A printing apparatus comprising: The printing apparatus according to claim 1, further comprising: a number-of-times determining unit that determines the predetermined number of times according to the target angle.

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