JP2552885B2 - Recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus using a plurality of recording sheets wound in a roll shape, for example, a recording apparatus such as a facsimile apparatus or a printer apparatus.

[Prior Art] In a recording apparatus that uses a plurality of recording sheets wound in a roll (so-called double roll machine), the state of the sheet is unknown when the power is turned on, after the cover is opened and closed, and the like.

In this case, both have a sheet, both have no sheet (or near end mark), or one has a sheet and the other has no sheet (or near end mark).

When both sheets are present, basically the sheet positions are initialized for both sheets, and when both sheets are not present (or near end mark), the display without recording sheet is performed. The initialization of the sheet position means that the leading edge of the sheet is in the standby position.

Then, when one has a sheet and the other has no sheet (or a near end mark), only the sheet existing in the recording portion is initialized. In other words, if one has a sheet and the other has no sheet (or a near end mark), it is checked whether the recording sheet determined to have the sheet is on the platen roller, and the sheet is on the platen roller. If so, the leading end position of the sheet is initialized.

When checking whether or not the sheet is placed on the platen roller, a sheet sensor is provided in advance on the upstream side of the recording unit, and the feed roller is reversely rotated by a predetermined amount while the platen roller is stopped. If the recording sheet sensor detects the leading edge of the sheet, it is determined that the leading edge of the sheet is not on the platen roller. Conversely, if the recording sheet sensor cannot detect the leading edge of the sheet during the reverse rotation, it is determined that the platen roller is gripping the sheet.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, when the recording sheet is hung on the platen roller, the platen motor is stopped and the torque of the feed motor is increased when the feed motor is rotated in the reverse direction. Since the number of feed motors is small, the feed motor cannot pull the sheet, and the feed motor loses synchronization, which causes an unpleasant sound. Therefore, there is a problem that the user is annoyed and the current continues to flow in a state where the motor is out of step, which causes a decrease in reliability of the motor.

[Means for Solving the Problem] The present invention accommodates the first and second recording sheets wound in a roll shape, and selectively supplies the first and second recording sheets to a recording unit provided with a recording head. A recording apparatus for conveying and recording an image on a selected recording sheet, comprising two upstream sheet detection sensors for detecting the presence or absence of a first recording sheet and a second recording sheet upstream of the recording section, and a downstream side of the recording section. A downstream sheet detection sensor for detecting the presence / absence of a recording sheet is provided, and when the power is turned on, one of the upstream sheet detection sensors detects the presence of the sheet and the other of the upstream sheet detection sensors detects the absence of the sheet. If both the recording sheet and the second recording sheet are conveyed by the first predetermined amount and the outputs of the two upstream sheet detection sensors do not change, the recording sheet detected by the upstream sheet detection sensor is transferred to the second predetermined sheet. A control unit is provided that conveys the recording sheet by the amount and positions the leading edge of the recording sheet at the standby position when the recording sheet is detected by the downstream sheet detection sensor.

[Operation] According to the present invention, the first recording sheet and the second recording sheet are detected when one of the upstream sheet detection sensors detects the presence of the sheet and the other of the upstream sheet detection sensors detects the absence of the sheet when the power is turned on. And both are carried by the first predetermined amount, and 2
If the outputs of the two upstream sheet detection sensors do not change, the recording sheet detected by the upstream sheet detection sensor is conveyed by the second predetermined amount, and when the recording sheet is detected by the downstream sheet detection sensor, the leading edge of the recording sheet is moved. Since it is located at the standby position, it is possible to prevent the stepping out of the feed motor caused by the recording sheet hitting the platen roller. It is also possible to prevent the reliability of the motor from being deteriorated by continuing to flow the current in this state.

[Embodiment] FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a recording apparatus.

In this embodiment, when the recording sheet 1a set on the front side is detached from the platen roller 6, the sheet 1a
Feed roller 2a that conveys the sheet 1b, the feed roller 2b that conveys the sheet 1b when the recording sheet 1b set on the back side is out of the platen roller 6, the upstream sheet detection sensors 3a and 3b, and the downstream sheet detection sensor 3c and the thermal head 4 for printing on a selected sheet of the recording sheets 1a or 1b. Where the upstream sheet detection sensor
The sheets 3a and 3b are provided upstream of the recording unit constituted by the thermal head 4 and the platen roller 6, and are respectively attached to the sheet 1
The downstream sheet detection sensor 3c is for detecting the near-end marks a and 1b or the absence of the sheet, and the downstream sheet detection sensor 3c is provided between the recording unit and the cutter 16.

Further, a spring 5 that generates a pressure between the thermal head 4 and the platen roller 6, a platen roller 6 that conveys the selected recording sheet to the recording unit, a platen motor 7 that drives the platen roller 6, and a feed. roller
It has feed motors 8 and 9 for driving 2a and 2b, respectively, and a main controller 10 for controlling the entire apparatus shown in FIG.

In addition to this, a motor driver 11 that drives the motors 7, 8 and 9, a motor control block 12, and sensors 3a, 3b and 3c.
An input port 13 for inputting information from the recording sheet, a recording sheet conveying section 14, a storage section 15 for storing the recording sheet, and a cutter 16. The recording sheet conveying unit 14 is a conveying unit that sends out or pulls back the recording sheet to the recording unit.

The main controller 10 conveys the first and second recording sheets by a first predetermined amount when one of the upstream sheet detection sensors detects white and the other of the upstream sheet detection sensors detects black, When the outputs of the one upstream sheet detection sensor and the other upstream sheet detection sensor do not change, the first and second recording sheets are conveyed by a second predetermined amount, and the downstream sheet detection sensor at this time Is an example of a determination unit that determines the recording sheet to be initialized in accordance with the output of.

FIG. 2 is a diagram showing a state in which the leading edge of the sheet 1b is at the standby position and the leading edge of the sheet 1a is at the recording position in the above embodiment. FIG. 3 is a view showing a state in which both the sheets 1a and 1b are in the standby position. FIG. 4 is a diagram showing a state in which the sheet 1a is at the standby position and the sheet 1b is at the recording position.

 Next, the operation of the above embodiment will be described.

FIG. 5 is a flow chart showing the operation of the above embodiment.

When the main power of the system is turned on (that is, after the irregular state is restored), first, it is determined whether the upstream sheet detection sensor 3a detects white and the upstream sheet detection sensor 3b detects black ( S1). If the sensors 3a, 3b
When white and black are detected respectively, the rollers 2a, 2b and 6 are rotated to advance the sheet by a predetermined amount La (a length sufficiently longer than the size of the sensors 3a and 3b) (S2), and the sensor 3a , 3b
The output of is judged again (S3). In addition, when the sensor detects white, it means that the sheet exists, and when the sensor detects black, it means that the sheet does not exist.

If the sensors 3a and 3b have not detected white and black, respectively, that is, if the state of the sheet leading edge has changed, the leading edge positions of the sheets 1a and 1b are initialized or no sheet is displayed (S4). ). That is, if both the sensors 3a and 3b detect white, the tip positions of the sheets 1a and 1b are initialized,
If both 3a and 3b detect black, it indicates that there is no sheet,
stand by.

On the other hand, if the sensors 3a and 3b detect white and black, respectively, that is, if the state of the sheet has not changed, the output of the downstream sheet detection sensor 3c is checked (S5), and if this output is white, The sheet leading end position is initialized only for the sheet 1a (S6). In S5, the fact that the sensor 3c detects white means that the sheet 1a exists in the recording portion, but the sheet 1b has no sheet or a near end mark. Even with the above-mentioned near-end mark, the near-end mark does not exist in the recording portion.

If the sensor 3c detects black in S5, the state of the sheet is unknown. Therefore, a timer (not shown) is set, the platen motor 6 is normally rotated, and the sheet is advanced by a predetermined amount Lb (S7). Here, the predetermined amount Lb is a length sufficiently longer than the distance L3 + L1 + L5 shown in FIGS. 6 and 7. Distance L3
Is the distance from the upstream sheet detection sensor 3a to the standby position, the distance L1 is the distance from the standby position to the recording unit, and the distance L5 is the distance from the recording unit to the downstream sheet detection sensor 3c. The timer time of the timer is sufficiently longer than the time required for the seat 1a to move the distance L3 + L1 + L5.

If the sensor 3c detects white during or after the advance of the sheet (S8), the leading edge position of only the sheet 1a is initialized (S6).

On the other hand, if the sensor 3c detects black (S9) even after the timer time elapses, the sheet 1a does not exist in the recording unit and the sheet 1b is not present.
Exists in the recording portion as it is or has no sheet, the sheet leading edge position is initialized for both sheets 1a and 1b (S10), and the process waits.

Distances L2 and L4 in FIGS. 6 and 7 are distances in the sheet 1b and correspond to the distances L1 and L3, respectively.

In the above embodiment, the case where the sensors 3a and 3b detect white and black has been described, but the sensors 3a and 3b are black and
When white is detected, if a after the number is changed to b and b after the number is changed to a in the above description, the explanation is completed.

In the above embodiment, when it is determined whether or not the sheet is placed on the platen roller 6, the feed motor is not rotated, so that no unpleasant sound is generated due to the step out of the feed motor.

The recording sheet includes, for example, a plastic sheet and a normal sheet in addition to the recording sheet. Further, the present invention is not limited to the thermal recording method shown in the present invention, and can be applied to a recording apparatus using a so-called thermal transfer recording method using an ink sheet, for example.

EFFECTS OF THE INVENTION According to the present invention, it is possible to prevent the stepping out of the feed motor caused by the recording sheet hitting the platen roller, and thus to prevent the generation of uncomfortable noise due to the stepping out. It is possible to prevent a decrease in reliability of the motor due to continuous current flow in a state where the motor is out of step.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 2, 3, and 4 are diagrams showing typical examples of the sheet leading end position in the above-described embodiment. FIG. 5 is a flow chart showing the operation in the above embodiment. 6 and 7 are diagrams for explaining the operation of the above embodiment. 1a, 1b ... recording sheet, 2a, 2b ... feed roller, 6 ... platen roller, 7 ... platen motor, 8, 9 ... feed motor, 10 ... main controller.

Claims (1)

(57) [Claims] 1. A first recording medium, a first recording medium, and a second recording medium, which accommodate first and second recording sheets wound in a roll and which are provided with a recording head.
A recording device for selectively conveying the recording sheets of No. 2 and recording an image on the selected recording sheets, the two upstream sheet detecting units detecting the presence or absence of the first and second recording sheets upstream of the recording unit. A sensor; a downstream sheet detection sensor that detects the presence or absence of a recording sheet on the downstream side of the recording unit; one of the upstream sheet detection sensors detects the presence of a sheet when the power is turned on, and the other of the upstream sheet detection sensors When the absence is detected, the first recording sheet and the second recording sheet are both conveyed by a first predetermined amount, and if the outputs of the two upstream sheet detection sensors do not change, the upstream sheet is detected. When the recording sheet detected by the detection sensor is conveyed by a second predetermined amount and the recording sheet is detected by the downstream sheet detection sensor, the recording sheet is detected. Recording apparatus characterized by having: a control means for positioning the tip at the standby position.