JPH02295774A - How to control the operation timing in a label printer - Google Patents

Abstract

PURPOSE:To control the cut timing of label sheet by detecting the difference of a light permeabilities of a mounting board and label sheets by a photoelectric sensor, comparing the output of the sensor with a reference value, regulating and amplifying it, and then outputting it. CONSTITUTION:Since many label sheets 11a are adhered at a suitable interval on the mounting board 11b of a continuous sheet, the output of a sensor 81 is intermittently obtained at each label sheet 11a during printing and feeding of the continuous sheet. In order to control a timing for cutting each sheet 11a, a position sensor 82 is provided immediately after a roller mechanism 56. The sensor 82 has the same structure as that of the sensor 81, has a detector which includes an operational amplifier 15 with two variable resistors R1, R2, a comparator 18 and an A/D converter 16, compares the output value of the amplifier with a reference value and judges it at a CPU. A motor 53d is so controlled that a cutting blade 53a rotatably arrives at a cutting point Cp after a period of time in which the sheet 11a is fed at a distance l4 from the time when the sensor 82 detects the tip end of the sheet 11a as a cutting position.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a label paper detection method suitable for an electrophotographic label printer using continuous paper, a printing start timing using this detection, and This invention relates to a method of controlling cut timing.

[Conventional technology]

2. Description of the Related Art Label printers that continuously print label display contents on continuous paper having a large number of label papers are known.

When an electrophotographic printing method is adopted as the printing method of such a label printer for continuous paper, a label paper detection sensor is essential in order to control the printing start timing and the label paper cutting timing.

For example, if the continuous paper is made up of a large number of self-label papers pasted at appropriate intervals, the timing at which the print head etc. in the printing mechanism starts operating for each label paper, or
An important requirement for electrophotographic label printers is to accurately control the cutting timing of each label paper after printing has been completed, regardless of the length of each label paper. The sensor that detects paper plays an important role. [Problems to be Solved by the Invention] With continuous paper having a large number of label paper units, it is necessary, for example, to detect each label paper during printing and control the printing timing for each label paper.

This detection of the label paper section focuses on the fact that there is a difference in the overall thickness of the paper between the backing paper of the continuous paper and the part of the backing paper where the label paper is pasted. For example, the label paper section can be detected by using a optical sensor whose output varies depending on the light transmitting wheel. However, for continuous paper with a label paper section, the thickness of the mount and the thickness of the label paper attached to it are not necessarily the same for each continuous paper, so the sensitivity of the sensor is not fixed at a constant level. If the sensor output becomes unstable due to differences in the thickness of the backing paper or label paper, or if the output of the sensor detection signal varies from large to small, it may be difficult to process it as is. However, there is a problem in that it is difficult to stably detect label paper.

The first object of the present invention is to provide a method for detecting label paper that operates without the above-mentioned problems.

On the other hand, even if the thickness of the backing paper and label paper in each continuous paper containing the label paper to be printed is constant, the length of the label paper section often varies for each continuous paper.
There is also the hassle of having to adjust the timing of printing start every time the length of each label sheet in continuous paper changes.

Even if the length of continuous paper that you want to print on is loaded into a label printer, printing will automatically start for each label paper each time the length of the label paper differs. The second objective is to provide a method that can control the timing of .

In addition, the present invention automatically adjusts the cut timing for cutting after printing label paper of different lengths for each continuous paper, even if the length of label paper for each continuous paper is different. The third object of the present invention is to provide a method for controlling cut timing that can be controlled by the following methods.

[Means to solve the problem]

Accordingly, the configuration of the first invention that can solve the first problem described above is to run a continuous paper consisting of a mount and a label paper, print continuously on each label paper of the continuous paper, After that, when cutting each label paper, the difference in the light transmittance wheel of the backing paper and each label paper is detected by the optical sensor, and the difference in the thickness of the backing paper and the label paper is detected by the optical sensor. The present invention is characterized in that the different sensor outputs generated by the sensor are adjusted and amplified by comparing them with appropriate reference values arbitrarily set in advance for both paper portions, and the detection signals of the label paper and the mount are extracted. The configuration for solving the above second problem of the present invention is that when continuous paper having label paper is run through a transport path in a printer and printing is continuously performed on the continuous paper by an electrophotographic method, the transport path is In front of the printing mechanism, a sensor is installed to detect each label paper in the continuous paper as a printing position, and when the continuous paper is run, a signal indicating the printing position detected by the sensor is used as the timing for starting the operation of the printing mechanism. It is characterized in that it is a signal.

The configuration of the present invention for solving the third problem described above is such that continuous paper having a large number of label papers is continuously printed on each label paper using an electrophotographic method while traveling along a conveyance path, and then the continuous paper is When cutting paper for each label paper, a sensor for detecting each label paper as a cut position is arranged after the fixing section in the conveyance path, and when the sensor detects each label paper, based on this detection signal, The feature is that the operation timing of the cutter mechanism is determined.

[For production]

Even if the thickness of the mount or label paper differs depending on the continuous paper, the sensor output will be adjusted and amplified based on the standard value set for any mount or label paper, and the sensor output will be adjusted to match the label paper. A detection signal that is clearly separated from the mount is obtained. Therefore, even if the thickness of the backing paper for continuous paper changes, there is no need to adjust the sensitivity of the sensor for detecting label paper. Sensors placed at predetermined positions on the transport path within the printer detect each label sheet in the continuous paper as a print position, and this detection signal activates the print head and transfer charger in the electrophotographic printing mechanism. The positions where the above sensors are installed are such that each printing position detected by the sensor in front of the photosensitive drum in the conveyance path and the part facing the print head on the photosensitive drum in the printing mechanism are aligned with the running of the continuous paper and the photosensitive drum. This is a position where the same point can be reached at the same time on the conveyance path as the drum rotates, or the near side thereof. When the cut position sensor installed after the fixing unit in the transport path inside the printer detects each label paper in the traveling continuous paper as the cut position, the cutting blade of the cutter mechanism is activated based on this detection signal. Form a signal to Depending on the distance from the installation position of the sensor to the cutting blade of the cutter mechanism and the running speed of the continuous paper,
The time required for the detected cutting position to reach the cutting position is calculated, and the blade performs the cutting action as this time elapses.

When a large number of labels of the same length are formed on a running continuous paper, the cycle of the cutting action of the blade is determined by the running speed of the continuous paper and the length of each label paper. Additionally, the spacing between label sheets can be calculated and set.

〔Example〕

Next, embodiments of the present invention will be explained with reference to the drawings. First, in order to clarify the present invention, an outline of the overall configuration of a label printer P using an electrophotographic method will be explained with reference to FIG.

Reference numeral 50 denotes a machine body, and a supply reel 51 and a take-up reel 52 are disposed on a reel shaft provided at the front and rear ends (left and right in the figure) of the machine body 5o. Note that the take-up reel 52 and this reel 52
The cutter mechanism 53 disposed in the vicinity of is selectively provided with either one.

Inside the body 50, a photosensitive drum 10 is disposed in the middle in the front-rear direction. The continuous paper 11 is fed to the supply reel 5
a guide post 55 on the rear end side of the machine body 50, which is fed out from the machine body 5o and fed into the interior of the machine body 50; The continuous paper 11 is passed through a conveyance path N formed by a plurality of guide plates 57 disposed in the middle of each roller mechanism 56 so as to sandwich the continuous paper 11 from above and below, a guide post 58 on the front end side of the machine body 50, etc. It is adapted to be wound up on a winding reel 52. The above continuous paper 11
is brought into and out of contact with the lower surface of the photosensitive drum 10 inside the body 50. That is, in the transport path N, a transfer charger 61 is disposed on the lower facing surface of the photosensitive drum 10 so as to sandwich the continuous paper 11 between it and the lower surface of the drum 10. The continuous paper 11 is brought into and out of contact with the lower peripheral surface of the drum 10 by being displaced to the positions indicated by the solid line and the chain line in the figure. Near the starting end of the conveyance path N located before the photosensitive drum 10, there is a paper sensor 6 for detecting the presence or absence of the continuous paper 11.
4, and a print position sensor 81 that detects a label paper formed by pasting or the like on the continuous paper 11 as a print position on the continuous paper 11.

In addition, in order to stably take out the continuous paper 11 sent out from the lower peripheral surface side of the photosensitive drum 10 without adhering to the drum 10, the continuous paper 11 is placed in the conveyance path N located in front of the photosensitive drum 10 in the machine body. A conveyor-like suction device 66 that uses a belt to suck paper 11 downward with negative pressure, and this suction device 6
The cutting position of the continuous paper 11 is detected in front of the fixing device 67, which fixes the toner attached to the continuous paper 11 conveyed to the front of the machine by a pair of heat rollers 12 and 13, and the cutting mechanism 53. A cut position sensor 82 is provided. Note that this label printer P may not be provided with the absorber 66.

On the other hand, around the photosensitive drum 10, there is a main charger 71 that charges the photosensitive drum 10 on the drum surface before printing, a print head 72 that supplies print information such as figures and characters to the photosensitive drum 10, and a photosensitive drum 10. Developers 73 are sequentially arranged to apply toner to the print information given to the drum 10.

Further, on the drum surface after printing, a peeling claw 75 for peeling the continuous paper 11 from the photosensitive drum 10 and a blade 7 are provided.
7, a cleaner (toner collector) 78 having a magnet roller 76, and an eraser 79 for erasing charges on the photosensitive drum 10.

In the above, the print position sensor 81 and the cut position sensor 82 are both provided to detect label paper in continuous paper. Here, the sensor 81 is called a print position sensor because its output is used to detect the label paper before printing as the print position and control the print timing for the label paper.
2 is called a cut position sensor because it is used to detect the label paper after printing as a cut position and control the cutting timing of the label paper, but the sensor structure is the same.

As an example, the detection of label paper in the present invention may be performed using the second
Since this is implemented in the manner shown in the figure, this point will be explained next.

Both sensors 81 detect the printing position and the cutting position.
, 82 have a light receiving section 81 on the upper side with the transport path N in between.
This sensor is of the Koichi Denki type and has a structure in which light emitting parts 8lb and 82b are respectively disposed opposite to each other on the lower side of the conveyance path N facing the light receiving parts 81a and 82a.

In other words, the mount 1lb in the continuous paper 11 and this mount 1l
There is a difference in paper thickness between the part of the label paper 11a pasted on the paper 11a and the part of the label paper 11a, and the light transmission wheel is different between the parts of the paper 11a and llb.By detecting this with an electrical signal, the label paper 11a can be detected. It is designed so that it can be detected separately from the 1 lb mount.

In the continuous paper 11, the mount 1 lb and the label paper 11
There are different types of a, such as thickness and material. paper 11a
, llb, the difference between the light transmitting wheels may not be very large.

For example, a 1 lb mount is relatively thick, but a 1 lb label paper is relatively thick.
If 1a is relatively thin, or if both the mount 1lb and the label paper are relatively thick, it is difficult to see a difference in the light transmittance. In such continuous paper, if there is not a large difference in the light transmission wheel between the backing paper part and the label paper part, the detection of the label paper 11a will be clearly different from the detection of the backing paper 1lb using only the outputs of the sensors 81 and 82. In the present invention, label paper is detected without such difficulty by a detection circuit having a configuration as shown in FIG. 1. Next, this detection circuit will be explained.

In Fig. 1, 15 is an operational amplifier that amplifies the output 81A of the sensor 81, and this amplifier 15 has a variable resistor R for changing the reference voltage V and a variable resistor for changing the amplifier gain. Comes with resistor R2. 16 is an AD converter that converts the output 81A of the sensor 81 and the output 81B of the operational amplifier 15 into digital signals,
The signal is supplied to the PU 17.

Here, this CPU 17 can arbitrarily set and change the values of the resistors R,, R, and the setting of this resistance value is determined by comparing the output of the mount 1lb and the output of the label paper 11a at the sensor 81. At the same time, the output corresponding to the mount 1 lb and the output corresponding to the label paper 11a in the operational amplifier 15 are compared, and it is determined whether the output of the operational amplifier 15 can clearly distinguish between the mount 1 lb and the label paper 11a.

When the output of the operational amplifier 15 is such that it is possible to clearly distinguish between a backing paper and a label paper, the values of the resistors R1 and R2 are fixed.

18 is a comparator, 19 is a latch circuit section, 20 is a shift register, and 21 is a timer part consisting of five independent timers 21a to 21e.
If it is determined that the variable resistor R. ，
R, is fixed there.

Since a large number of label sheets 11a are pasted on the continuous paper mount 1lb at appropriate intervals, while the continuous paper 11 is running for printing, the output of the sensor 81 is intermittently transmitted for each label sheet 11a. can be obtained. On the other hand, the print position sensor 81 has a set position at the transfer point 61P (transfer charger 6) of the actual print data as in the embodiment shown in FIG.
Since the first label paper 11a is detected by the sensor 81 and until this paper reaches the transfer point 61P, each of the next label papers 11a is successively detected by the sensor 81. Go through the section. In order to cope with this, the present invention provides a plurality of timers. In this embodiment, five independent timers 21a=21e are provided.
Each time each label paper 11a is detected by the sensor 81, the timers 21a to 21e are activated sequentially, and the print head 7 is
2 is started one by one. 22 is an OR gate section, 7.2a is a print head control section, and this control section 72a
Which timer 21a~? The print head 72 is activated every time there is a clock output from 1e.

The sensors 81 and 82 are installed in the transport path N of the continuous paper 11 in the printer body 50 as shown in FIG. 2, and their installation positions are set as follows.

Therefore, on the outer circumference of the photosensitive drum 10, the circumferential length from the position @729 facing the print head 72 to the position facing the transfer charger 61, that is, the transfer point 61p is n.
(2) When the transfer charger 61 on the transport path N
, that is, a distance Q1 equal to the circumference Q1 on the front side of the fuselage 50 starting from the transfer point 61P.
At the same time, a distance Q3 obtained by adding a smaller appropriate distance Q2 to this distance Q1 is set as an installation point SP, and the sensor 81 is installed at this point SP. Therefore, the distance a1 from the transfer point 61p on the conveyance path N
The position is set as the starting point Dp of the print head 72, and if the print head 72 is started when the leading edge of the label paper 11a reaches this point DP, the label paper 11a detected by the sensor 81 will be at the position of the transfer charger 61. 6
When the label reaches 1P, the print information generated by the activation of the print head 72 is transferred onto the label paper 11a.

In the present invention, each label paper 11 on the running continuous paper 11
Each of the timers 21a to 2 in the timer section 21 is a time period from when a is detected by the sensor 81 at the installation point Sp until it reaches the starting point Dp of the print head 72.
1e is detected by timing. That is, since the running speed of the continuous paper 11 is set and known in advance, by dividing the distance Ω2 from the sensor installation point SP to the starting point Dp by the running speed of the continuous paper 11, the label paper 11a is Installation point S of sensor 81
The time Tp required for the print head 72 to move from p to the activation point DP is known. Therefore, in the present invention, by setting the required time Tp in advance as the time measured by each of the timers 21a to 21e, a large number of label sheets 11a of the running continuous paper 11 can pass through the sensor 81 one after another. Also, a print head 72 is installed for each label sheet.
The activation control signal can be supplied to the

FIG. 3 is a time chart of the output waveform of the sensor 81 via the comparator 18, the output waveform of the timers 21a to 21e, and the output waveform of the control section 72a of the print head 72.

The output of the sensor 81 via the comparator 18 is the output of the continuous paper 1.
The waveform b1 of the portion of the mount 1lb and the waveform a of the portion of each label paper 11a in No. 1 appear as continuous rectangular waves. Each of the timers 21a to 21g is started every time there is a comparator output indicating a portion of each label sheet 11a, and each timer measures a time Tp. Each time each of the timers 21a to 21e finishes measuring the time Tp, the control unit 72a of the print head 72 outputs print commands P1 to Pn, respectively.

In this embodiment, only five timers 21a to 21e are provided, but it is optional whether five or more or fewer timers are provided. Here, the five timers 21a to 21e, which are provided to correspond to each label paper 11a that continuously travels during the distance Q3, are configured to be reset each time the time measurement is completed.

With the above configuration, each label paper 11a serving as a printing position on the continuous paper 11 is detected one by one on the conveyance path N, and until each label paper 11a reaches the transfer point 61P of the transfer charger 61, the photosensitive drum 10 is charged and given printing information, and the toner attached to this information part can be transferred to the printing position of each label paper by the action of the transfer charger 61, so there is no waste of paper.

The above example describes an example in which a signal detected by the print position sensor 81 detecting the leading edge of the label paper 11a is used as an operation timing signal for the print head 72 in the print mechanism disposed around the photosensitive drum 10. ．． Therefore, the print head 72 is activated in line with the leading edge of the label paper 11a, but by adjusting the distance Q2, that is, the set time of the timer part 21, the print head 72 can be activated.
It is also possible to control the activation of the label paper 11a so that it is activated at an arbitrary position in the length direction of the label paper 11a. Further, in the present invention, the detection signal from the sensor 81 may be used as an operation start timing signal for the suction device 66 and the fixing device 67.

Furthermore, when the continuous paper 11 having the label paper 11a has a large number of label papers 11a of a certain length attached at equal intervals in the conveyance direction, the sensor 81 detects the label paper 11a for each label paper 11a and the backing paper 1lb. , first label paper 1
Since the same signal as the detection signal for label paper 1a and mount paper 1lb is repeatedly output, in such a case, the operation of the print head 72 for each label paper 11a is determined by the detection signal for the first label paper 11a and mount paper 1lb. The timing may also be controlled.

sequentially detecting each label paper 11a in the continuous paper 11;
It is also necessary to control the operating timing of the printer based on the detection signal when the cutter 53 cuts each label sheet 11a on which printing has been completed.

In the present invention, in order to control the cut timing at which the cutter mechanism 53 cuts each printed label sheet 11a of the traveling continuous paper 11, the following configuration is adopted. First, as shown in FIGS. 2 and 5, in the conveyance path N of the machine body 50, a light receiving section 82a located on the upper surface side of the continuous paper 11 and a light receiving part 82a located on the upper surface side of the continuous paper 11 and the continuous paper 11 are located almost immediately after the roller mechanism 56 at the final stage. A cut position sensor 82 is provided, which includes a light receiving section 82a and a light emitting section 82b facing the light receiving section 82a. This sensor 82 has the same configuration as the print position sensor 81 described above. Although not shown, the output of this sensor 82 is provided with a detection circuit including an operational amplifier with two variable resistors, a comparator, and an A/D converter similar to the detection circuit of the print position sensor 81, and is connected to the CPU. It is configured so that the output value of the amplifier is compared with a reference value. In FIG. 5, 91 is the cut position detection sensor 8.
92 is a detection circuit 91 that adjusts and amplifies the output of 2;
93 is a shift register that sequentially starts the three timers 94a to 94c of the timer section 94 for each signal indicating each label sheet 11a supplied through the latch circuit 92; 95 is a shift register for starting the three timers 94a to 94c of the timer section 94; ~
An OR gate section 94c supplies an operating signal to a driver 96 that controls the driving of the pulse motor 53d every time the clock 94c completes the measurement of time Tm, and a CPU 97 controls each section of the detection circuit 91.

On the other hand, the cutter mechanism 53 is removably provided on the ejection side of the continuous paper 11 in the machine body 50.

This cutter mechanism 53, as shown in FIG.
It has an introduction path 53h for the continuous paper 11 formed by a plate or the like on a surface continuous with the conveyance path N of the continuous paper 11 in , and a rotary cutting blade 53a and a receiving blade 53c are sandwiched between the introduction path 53h from above and below. Arrangement and conveyance path N
A cut point Cp is formed on an extension of the line.

The cutting blade 53a is attached to a shaft 53b, and is connected to a stepping motor 53d via a pulley 53f and a belt 53g, for example, and is driven by the output of the motor 53d.
Cutting rotation is performed with the circumferential speed of rotation arbitrarily controlled.

Here, since the running speed of the continuous paper 11 is known in advance, the distance Q4 between the installation point Sc of the sensor 82 and the cut point Cp can be replaced with time. Therefore, the sensor 82 cuts the leading edge of the label paper 11a. The motor 53d is controlled so that the cutting blade 53a rotates and reaches the cut point Cp after the time required for the label paper 11a to travel the distance Q4 after the position is detected. In this embodiment, since the cutting blade 53a is a rotary blade, the time required for the cutting edge of the blade 53a to make one rotation from the cut point Cp and reach the cut point Cp again is determined by the motor 53d.
It is controlled by the rotation speed of. For this reason, the installation point S
Distance from c to starting point Md of motor 53d +2
5 is replaced with the time Tm, and this time Tm is set as the timer part 9.
The timers 94a to 94c of 4 are configured to measure time for each label sheet 11a. Therefore, the time Tc during which the cutting edge of the cutting blade 53a rotates by half due to the rotation of the motor 53d is combined with the distance 2 from the motor starting point Md until the cut position of each label paper 11a reaches the cut point Cp. There is.

Detection signals of label paper 11a and mount 1lb of light receiving section 82a in cut position sensor 82, timers 94a to 9
The measured time Tm of 4c and the control output for the rotation of the motor 53d that causes the cutting blade 53a to perform the cutting action are related as shown in the time chart shown in FIG.

In the time chart of FIG. 4, the output of the sensor 82 is
The continuous paper 1 is supplied via the comparator of the detection circuit 91.
Output a2 and mount 1 for label paper 11a in 1
The output b2 for lb appears. The timer 94a is activated every time there is an output indicating the label paper 11a.
- 94c are activated in sequence, and the time Tm set in advance for each timer is sequentially counted.

Each time each of the timers 94a to 94c completes the time Tm, the drive control signals C1 to Cn are sequentially supplied to the drive motor 53d of the cutting blade 53a. This series of operations is repeated for a plurality of label sheets 11a of the continuous paper 11. Here, in the above control system, the timer part 94 is provided with three timers 94a to 94c, and is configured to operate these timers repeatedly in sequence. Until the cut point Cp, the label paper 11a of the continuous paper 11
This is because we assumed that there may be cases in which at most three cards are included. Therefore, the independent timer in timer portion 94 is
How many sheets of label paper 11 are there between the above two points Sc”Cp?
It can be set arbitrarily depending on whether a is included. In the above example, the cut position is explained as being at the leading edge of the label paper 11a, but the cutting position may be set to the front of the leading edge of each label paper 11a, for example, in the middle between the label papers on the mount 1lb, or arbitrarily. The time Tc, that is, the distance Q6, can be arbitrarily set so that the position of . In addition, when label sheets 11a of the same length are pasted to this continuous paper 11 from the first label sheet 11a at equal pitches, the remaining label sheets 11a are pasted based on the detection signals of the first label sheet 11a and the backing paper 1lb. The circumferential speed of the blade 53a for cutting each label paper 11a can be controlled.

〔Effect of the invention〕

The present invention is as described above, and according to the label paper detection method of the present invention, in a label printer that continuously prints by electrophotography on continuous paper having a large number of label papers on the continuous paper, the label paper Even if the length and the thickness of the label paper and backing paper are different, the label paper and the backing paper can always be detected with a signal output at a certain level or higher that can be clearly distinguished from the backing paper. Therefore, it is extremely suitable for controlling print timing and cut timing in label printing on continuous paper having various paper conditions.

In addition, the printing timing control method according to the present invention allows the printing position on each label paper to be controlled even when continuous papers with different lengths of label paper are loaded one after another onto a supply reel to print different labels. Since it is possible to detect each point and automatically set the operation start timing of the printer's printing mechanism for the detected printing position, it is possible to set the printing timing for continuous paper with label paper of any label length. It can be controlled accurately and printing operations can be started automatically without wasting paper.

Furthermore, according to the cut timing control method of the present invention,
Regardless of the length of the continuous paper sheet, when cutting each label sheet after printing a label on each label sheet, the cutter's cutting action start timing and the cutting action cycle must be determined. Since this can be automatically adjusted, printing of a wide variety of labels in small quantities can be done extremely labor-savingly. It goes without saying that the present invention can also be applied to continuous paper on which perforated label paper is formed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a label paper detection circuit according to the present invention, FIG. 2 is a side view showing the configuration of a main part of a label printer to which the label paper detection method of the present invention is applied, and FIG. FIG. 4 is a time chart diagram for the print timing control method of the present invention, FIG. 4 is a time chart diagram for the cut timing control method of the present invention, and FIG. 5 is a side cross section of the main part of the cutting mechanism to which the cut timing control method of the present invention is applied 6 are side views of an example of a label printer to which the method of the present invention is applied. N...continuous paper conveyance path, 10...photosensitive drum, 11
...Continuous paper, lla...Label paper, llb...
Mounting paper, 53... Cutting mechanism, 61... Transfer charger, 67... Fixing device, 72... Print head, 81...
...Print position sensor, 82...Cut position sensor

Claims (1)

[Scope of Claims] 1. A continuous paper consisting of a backing paper and a label paper is run, printing is continuously performed on each label paper of this continuous paper, and then when each label paper is cut, the backing paper and each label paper are In contrast, the difference in the light transmission wheel between the two paper parts is detected by an optical-electrical sensor, and the different sensor outputs generated in the sensor due to the difference in the thickness of the backing paper and the label paper are transmitted to the two paper parts. A method for detecting each label paper in a label printer, characterized in that the detection signals of the label paper and the mount are extracted by comparing the detected signals with an appropriate reference value arbitrarily set in advance, and then adjusting and amplifying the detected signals. 2. When continuous paper carrying label paper is run through a conveyance path in a printer and printing is continuously performed on the continuous paper by an electrophotographic method, in front of the printing mechanism in the conveyance path,
A sensor is provided to detect each label paper in the continuous paper as a printing position, and when the continuous paper is run, a signal from which the sensor detects the printing position is used as a timing signal for starting the operation of the printing mechanism. A method for controlling the print start timing in a label printer. 3. A sensor that detects each print position on the continuous paper is configured to cover a distance equal to the circumferential length of the photosensitive drum corresponding to the transfer charger from the print head disposed outside the outer periphery of the photosensitive drum on the transfer path. Printing start timing in the label printer set forth in claim 2, wherein the start point is the position of the charger, and the end point of the distance is located in front of the transfer charger, and is disposed at this end point position or in front of the end point position. control method. 4. Either claim 2 or 3, wherein the signal that detects the print position on the continuous paper is a timing signal for starting the operation of the print head and transfer charger that are disposed outside the outer periphery of the photosensitive drum. A method for controlling the print start timing in a label printer described in . 5. After continuous printing is performed on each label paper using an electrophotographic method while running a continuous paper having a large number of label papers along a conveyance path, when cutting this continuous paper on each label paper, each label paper is cut. A label printer characterized in that a sensor for detecting the position is disposed after the fixing section in the conveyance path, and when the sensor detects each label paper, the operation timing of the cutter mechanism is determined based on this detection signal. A method for controlling the cutting timing of continuous paper. 6. The cutting action of the cutter mechanism is calculated by measuring the time required for the desired part of each label paper to reach the cutting position from the detection sensor position to the cutting position by the cutting blade, starting from the time when the signal from the sensor is detected. The method for controlling the cutting timing of continuous paper in a label printer according to claim 5, wherein the cutting blade is controlled to perform a cutting action in synchronization with the end of time measurement.