JPH06115079A - Recording device - Google Patents

Abstract

(57) [Summary] [Object] To attach ink to a desired position in the moving direction of a recording medium even if the amount of movement of the peripheral surface with respect to a predetermined rotation angle of the rotating drum is not constant. [Structure] A rotary drum 8 is axially supported so as to face the recording head 1. The rotary drum 8 is fixed to the rotary shaft 8a fixed to the output shaft of the drum motor 10, a fixed shaft 8b externally fitted to the rotary shaft 8a, and fixed to a recording apparatus main body (not shown), and fixed to the rotary shaft 8a. And a cylindrical portion 8c made of a transparent member. A laser Doppler type speed sensor 15 is fixed to the fixed shaft 8b so as to face the recording head 1. The laser Doppler speed sensor 15 includes a processing circuit 16
A control circuit 17 for applying an ejection signal to the recording head 1 is connected via the. When the rotating roller 8 is rotated, the moving speed of the recording medium 9 held in close contact with the cylindrical portion 8c is detected by the laser Doppler type speed sensor 15, and an ejection signal is applied from the control circuit 17 based on the detected speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs recording by applying a drive signal to the recording means while rotating a rotary roller around which the recording medium is wound, and causing the recording means to adhere ink to the recording medium. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, as a recording apparatus for recording on a recording medium by adhering ink to the recording medium, one which records by an ink jet recording system,
Various types of recording devices are known, such as one that performs recording by the thermal transfer recording method or one that performs recording by the wire dot recording method.

Among these various recording apparatuses, an example of an ink jet recording apparatus for recording on a recording medium by ejecting ink will be described below. Figure 5
FIG. 1 is a schematic configuration diagram of a conventional inkjet recording device. As shown in FIG. 5, the carriage 102 on which the recording head 101 is mounted has two guide rails 103 with arrows A.
Wire 1 slidably fitted in one direction and wound around a drive pulley 105 fixed to the output shaft of the carriage motor 104 and a driven pulley 106 rotatably supported.
It is bound to one site of 07. The recording head 101 is
An inkjet recording head that performs recording by ejecting ink from an ejection port (not shown). When the carriage motor 104 is driven, the drive pulley 105 rotates normally and reversely, so that the wire 107 rotates normally and reversely. It is configured to reciprocate in any direction.

On the other hand, the rotary drum 108 fixed to the output shaft of the drum motor 110 facing the ejection port of the recording head 101 has its axis parallel to the moving direction of the recording head 101 (direction of arrow A). Are arranged as follows. The recording medium 109 is closely attached to the peripheral surface of the rotating drum 108, and the rotating drum 108 is driven by the drum motor 110.
Is rotated in the direction of arrow B, the recording medium 109
Is moved upward in the drawing at a position facing the recording head 101. Also, at one end of the rotary drum 108,
An encoder 111 for detecting the rotation angle of the rotary drum 108 is provided. A processing circuit 116 for applying a predetermined process to the output signal from the encoder 111 is electrically connected to the encoder 111.
The control circuit 117 is configured to apply an ejection signal to the recording head 101 based on the output from the printer 6.

When the recording operation is started based on the above-described structure, first, the carriage motor 104 is driven to move the recording head 101 to the recording start position (the position facing the left end portion of the recording medium 109). When the recording head 101 is moved to the recording start position, the rotary drum 108 is rotated once in the direction of arrow B by driving the drum motor 110. At this time, the rotary drum 10 moves from the encoder 111.
An electric signal corresponding to the rotation angle of 8 is output. This signal output is subjected to a predetermined process in the processing circuit 116 and then output to the control circuit 117. The ejection signal from the control circuit 117 causes the recording head 101 to rotate the rotary drum 108.
The ink is ejected every time the is rotated by a predetermined angle.
When the rotary drum 108 makes one rotation, the recording head 101 is moved rightward in the drawing by the recording width, and thereafter, recording on the recording medium 109 is performed in the same manner. That is, if the angular velocity of the rotating drum 108 is constant, the recording medium 109
Is also constant, and the amount of movement of the recording medium is proportional to the rotation angle of the rotary drum, the ink ejection timing is controlled based on the rotation angle of the rotary drum 108.

[0006]

However, in the above-mentioned conventional ink jet recording apparatus, in reality, there is a change in the outer diameter of the rotating drum due to the eccentricity of the rotating shaft of the rotating drum or a change in temperature, and the rotating drum is kept constant. Even if the recording medium is rotated at an angular velocity, the moving speed of the recording medium is often not constant. As a result, even if the rotary drum is rotated by the same angle, the amount of movement of the peripheral surface of the rotary drum, that is, the amount of movement of the recording medium is not constant, and the ink ejection position in the moving direction of the recording medium is the desired ejection position. Will be different from. When the ink ejection position is different from the desired ejection position, the recorded image is disturbed and the recording quality is degraded. This problem occurs not only when the recording head is an ink jet recording head but also when it is based on another recording method.

An object of the present invention is to record ink capable of adhering ink to a desired position in the moving direction of a recording medium even if the amount of movement of the peripheral surface with respect to a predetermined rotation angle of a rotary drum is not constant. To provide a device.

[0008]

In order to achieve the above object, the present invention provides a recording means for adhering ink to a recording medium by applying a drive signal, a recording medium wound around the recording medium and held in close contact therewith, and is rotatable. A rotary drum disposed opposite to the recording means, wherein the recording means causes the recording means to adhere ink to the recording medium while rotating the rotary drum. Based on the speed detection means for detecting the moving speed of the medium in a non-contact manner, and the moving speed of the recording medium detected by the speed detecting means, the recording is performed every time the recording medium moves by a predetermined amount. Control means for applying a drive signal to the means.

Further, there is provided a recording means for adhering ink to the recording medium by applying a drive signal, and a rotary drum which is wound around the recording medium to hold the recording medium in close contact and is rotatably disposed opposite to the recording means. Then, in the recording device for adhering the ink to the recording medium by the recording means while rotating the rotating drum, the rotating drum includes a cylindrical portion at least a part of which is formed of a transparent member over the entire circumference, The rotary shaft is disposed at the axial center of the cylindrical portion and fixed to the cylindrical portion, and the fixed shaft is rotatably fitted on the rotary shaft and fixed to the recording apparatus main body. , Irradiating the recording medium fixed to a position facing the recording means with the transparent member interposed therebetween, and changing the frequency of the reflected laser beam from the recording medium And a laser Doppler type speed sensor for detecting the degree, and a control for applying an ejection signal to the recording means each time a predetermined number of the signals are output based on a periodic signal output from the laser Doppler type speed sensor. It may have a means, in this case, in the cylindrical portion, a portion formed of a transparent member,
A laser light reflection film that reflects the laser light from the laser Doppler type speed sensor may be formed.

Further, the recording means is provided with an electrothermal converter for generating thermal energy for ejecting ink, or utilizes film boiling generated in ink by thermal energy applied by the electrothermal converter. Then, the ink may be ejected from the ejection port.

[0011]

In the recording apparatus of the present invention constructed as described above, the rotary drum is rotated during recording, and the recording medium is moved accordingly. At this time, the moving speed of the recording medium is detected by the speed detecting means. Then, based on the moving speed of the recording medium detected by the speed detecting means,
The control means applies a drive signal for the recording means to the recording means each time the recording medium moves by a predetermined amount. As a result, the ink is attached to the desired position on the recording medium.

[0012]

Embodiments of the present invention will now be described with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic configuration diagram of a first embodiment of a recording apparatus of the present invention. As shown in Figure 1,
Carriage 2 with recording head 1 as recording means
Is fitted around two guide rails 3 slidably in the direction of arrow A, and is wound around a drive pulley 5 fixed to the output shaft of a carriage motor 4 and a driven pulley 6 rotatably supported. The wire 7 is connected to a part of the wire 7. The recording head 1 is an inkjet recording head that performs recording by ejecting ink from an ejection port (not shown), and the drive pulley 5 rotates in the forward direction when the carriage motor 4 is driven.
When the wire 7 is rotated in the reverse direction, the wire 7 is rotated normally and reversely, and is reciprocated in the direction of arrow A.

The recording head 1 will be described with reference to FIG. The recording head 1 has a plurality of ejection openings 1b at a predetermined pitch in the moving direction of the carriage 2 (see FIG. 1) on the ejection opening surface 1a facing the recording medium 9 (see FIG. 1) at a predetermined interval. An electrothermal converter (e.g., a heating resistor) 1e for generating energy for ink ejection is formed along the wall surface of each liquid passage 1d that connects the common liquid chamber 1c and each ejection port 1b. It is set up. Common liquid chamber 1c
Is in communication with an ink tank (not shown) that contains ink, and the common liquid chamber 1c is configured to be supplied with ink from the ink tank. The ink supplied from the ink tank to the common liquid chamber 1c and temporarily stored therein enters the liquid passage 1d due to a capillary phenomenon and forms a meniscus at the ejection port 1b to keep the liquid passage 1d filled. At this time, when the electrothermal converter 1e is energized via an electrode (not shown) to generate heat, the ink on the electrothermal converter 1e is rapidly heated to generate bubbles in the liquid passage 1d. The expansion causes the ink to be ejected from the ejection port 1b. Here, the electrothermal converter 1e is shown as the energy generating element for generating energy, but the present invention is not limited to this, and a piezoelectric element for generating mechanical energy that momentarily applies the discharge pressure may be used.

On the other hand, as shown in FIG.
A rotary drum 8 having an axis parallel to the moving direction of the recording head 1 (the direction of arrow A) is arranged opposite to the ejection port 1b (see FIG. 2). The rotary drum 8 is the drum motor 1
A rotary shaft 8a fixed to the output shaft of 0, and externally fitted to the rotary shaft 8a and fixed to a recording apparatus main body (not shown),
The rotary drum 8 has a fixed shaft 8b that is rotatable relative to the rotary shaft 8a, and the cylindrical portion 8c of the rotary drum 8 is fixed to the rotary shaft 8a. As a result, even if the rotary drum 8 is rotated in the direction of arrow B by driving the drum motor 10, the fixed shaft 8
b is not rotated. The cylindrical portion 8c of the rotary drum 8 is made of a synthetic resin such as polyethylene terephthalate having a thickness of about 0.1 mm and substantially transparent. The recording medium 9 is tightly wound around the peripheral surface of the cylindrical portion 8c, and by rotating the rotary drum 8 in the direction of arrow B by driving the drum motor 10, the recording medium 9 becomes the recording head 1 and the recording head 1. At the facing position, it is moved upward in the drawing. Further, a laser doppler type velocity sensor (laser doppler velocity sensor) as a velocity detecting means for non-contactly detecting the moving velocity of the recording medium is provided at a part of the fixed shaft 8b facing the recording head 1.
ter) 15 is fixed. This laser Doppler velocity sensor 15 utilizes the fact that when a moving object is irradiated with laser light, the light scattered by the object undergoes a frequency change proportional to the speed due to the Doppler effect, and the speed of the object is non-contact. Can be measured, and in this embodiment, it is used to measure the moving speed of the recording paper 9.

The laser Doppler type speed sensor 15 is electrically connected with a processing circuit 16 for applying a predetermined process described later to an output signal from the laser Doppler type speed sensor 15, and based on an output from the processing circuit 16. Then, the control circuit 17 as the control means applies the ejection signal as the drive signal to the recording head 1.

Further, when the head recovering operation is performed outside the range of the reciprocating motion in the recording operation of the recording head 1, the recording head 1
At the position where is moved (hereinafter referred to as "standby position"),
A head recovery device 12 including a cap 12a that is driven by a drive source (not shown) to face the ejection opening surface 1a of the recording head 1 (see FIG. 2) and caps the ejection opening surface 1a of the recording head 1 is provided. ing. This head recovery device 12 relates to capping of the ejection port surface 1a of the recording head 1 by the cap 12a during head recovery operation.
Ink suction or recording head 1 by appropriate suction means
Ink is pressure-fed by an appropriate pressurizing unit provided in the ink supply path to the head, and head recovery operation is performed such that ink is forcibly discharged from the ejection port 1b to remove thickened ink in the ejection port 1b. The recording head 1 is located at the standby position and is capped by the cap 12a during non-recording for the purpose of preventing the ink in the ejection port 1b (see FIG. 2) from being dried during the recovery operation. .

Next, the recording operation of this embodiment will be described. When the recording start operation is performed, the recording head 1 is separated from the recovery device 12 to release the capping of the ejection port surface 1a by the cap 12a, and the carriage motor 4 drives the recording start position (the left end of the recording medium). The position facing the section). When the recording head 1 is moved to the recording start position, the rotary drum 8 is rotated once in the direction of arrow B by driving the drum motor 10. At this time, the recording medium 9 is irradiated with the laser beam from the laser Doppler type speed sensor 15 through the cylindrical portion 8c of the rotating drum 8, and the recording medium at the position facing the recording head 1 is recorded from the laser Doppler type speed sensor 15. An electric signal having a frequency proportional to the moving speed of the medium 9 is output to the processing circuit 16. The frequency of the output signal from the laser Doppler type speed sensor 15 is very high, and the control circuit 1
In order to facilitate the discharge control in 7, the processing circuit 16
Then, the output signal from the laser Doppler type speed sensor 15 is frequency-divided and output to the control circuit 17. Control circuit 1
In 7, the number of waves input from the processing circuit 16 is counted, and when the number of counted waves reaches a predetermined number, an ejection signal is applied to the recording head 1. As a result, ink is ejected from the recording head 1 every time the recording medium 9 is moved by a predetermined amount.

In this way, ink is ejected from the recording head 1 while rotating the rotating drum 8, and when the rotating drum 8 makes one rotation, the recording head 1 is moved rightward in the figure by the recording width. Then, ink is ejected while rotating the rotary drum 8 in the direction of arrow B again, and thereafter, this operation is repeated to perform recording on the recording medium 9.

As described above, the laser Doppler speed sensor 15 is used to detect the moving speed of the recording medium 9 at the position facing the recording head 1, and the ink ejection timing is controlled according to this moving speed. As a result, even if the moving speed of the recording medium 9 is not constant due to eccentricity of the rotating drum 8 or change in the outer diameter due to temperature change, etc. Ink can be ejected to a desired position, and good recording without disturbance can be achieved. Further, since the laser Doppler type speed sensor 15 is provided inside the rotary drum 8, there is no interference between the recording head 1 and the laser Doppler type speed sensor 15 due to the movement of the recording head 1 during the recording operation. The degree of freedom is not hindered.

(Second Embodiment) FIG. 3 is a schematic configuration diagram of a second embodiment of the recording apparatus of the present invention. This embodiment is also an inkjet recording apparatus similar to the first embodiment, and the carriage 22 has four recording heads 21a, 21b, 21c, and
21d are mounted at equal intervals to each other. Each of the recording heads 21a, 21b, 21c, 21d is an inkjet recording head similar to that of the first embodiment, and ejects yellow, magenta, cyan, and black inks, respectively, and appropriately superimposes the respective colors. Thus, a full-color image is recorded on the recording medium 29. Each recording head 21a, 21b, 21c, 21d has a thickness of about 10 mm on the ejection port surface (not shown), and each recording head 21a, 21b, 21c, 21d has a thickness of about 5 m.
The four recording heads 21 are arranged every m.
When a, 21b, 21c, and 21d are put together into one recording head group, the thickness of this recording head group at the ejection port surface is about 45 mm. Further, the laser Doppler type speed sensor 35 is fixed to the fixed shaft of the rotary drum 28 as in the first embodiment, and its position is a position facing a substantially middle portion of the recording head group.

In this embodiment, four recording heads 21 are used.
Although there are a, 21b, 21c, and 21d, only one laser Doppler speed sensor 35 is provided, as described above, because the thickness of the ejection port surface of the recording head group is relatively large. This is because the speed is small while an arbitrary point on the recording medium 29 passes from the recording head 21a at the lowest position to the recording head 21d at the highest position.

The other guide rails 23, carriage motor 24, drive pulley 25, driven pulley 26, wire 27, rotary drum 28, drum motor 30, head recovery device 32, processing circuit 36, and control circuit 37 are respectively provided. The description may be omitted because it may be the same as that of the first embodiment.

The operation of this embodiment is also similar to that of the first embodiment, so its explanation is omitted. However, the ink ejection timing of each recording head 21a, 21b, 21c, 21d is set to
It is the same as in the conventional inkjet recording apparatus that it is necessary to shift according to the interval of 21d.

(Third Embodiment) FIG. 4 is a schematic diagram of the third embodiment of the recording apparatus of the present invention. This embodiment is also an inkjet recording apparatus similar to that of the first embodiment. What is different from the first embodiment is that the laser beam reflecting film is formed on the outer peripheral surface of the cylindrical portion 48c of the rotary drum 48 over the entire circumference of the cylindrical portion 48c. Four
8d is formed. Laser light reflection film 48d
Is a coating film or resin film made of a material that reflects the laser beam from the laser Doppler type speed sensor 55 to such an extent that the speed detection by the laser Doppler type speed sensor 55 is not hindered. The moving speed of the laser light reflecting film 48d is detected instead of the moving speed of the recording medium 49. The rest of the configuration is similar to that of the first embodiment, so its explanation is omitted.

Since the recording medium 49 is in close contact with the outer peripheral surface of the rotary drum 48, the laser light reflecting film 48d formed on the outer peripheral surface of the cylindrical portion 48c of the rotary drum 48 in this manner.
Even if the moving speed is detected, the result is almost the same as when the moving speed of the recording medium 49 is detected, and the same effect as that of the first embodiment can be obtained. Further, in the present embodiment, since the moving speed of the recording medium 49 is not detected, even if the recording medium 49 is transparent or black or the like, which is difficult to reflect the laser light from the laser Doppler type speed sensor 55, Ink can be ejected onto the recording medium 49 at a desired position in the moving direction of the recording medium 49.

In each of the embodiments described above, the cylindrical portion of the rotary drum is an example in which the entire cylindrical portion is transparent, but the entire cylindrical portion need not be transparent, and the laser beam of the laser Doppler type speed sensor is not necessary. It suffices that only the part irradiated with is transparent over the entire circumference. An example of the recording head of the inkjet recording system is shown,
The invention is not limited to this, and may be a thermal transfer recording type recording head or a wire dot type recording head.

The present invention provides excellent effects particularly in an ink jet type recording head and recording apparatus for recording by forming flying droplets by utilizing thermal energy among various recording methods.

With regard to its typical structure and principle, see, for example, US Pat. Nos. 4,723,129 and 4740.
What is done using the basic principles disclosed in 796 is preferred. This method can be applied to both the so-called on-demand type and continuous type, but especially in the case of the on-demand type, liquid (ink)
By applying at least one drive signal to the electrothermal converter arranged corresponding to the sheet or liquid path in which is stored, which corresponds to the recorded information and causes a rapid temperature rise exceeding nucleate boiling. , It is effective because it generates heat energy in the electrothermal converter and causes film boiling on the heat-acting surface of the recording head, resulting in the formation of bubbles in the liquid (ink) corresponding to this drive signal on a one-to-one basis. Is. The liquid (ink) is ejected through the ejection openings by the growth and contraction of the bubbles to form at least one droplet. It is more preferable to make the driving signal into a pulse shape because bubbles can be grown and contracted immediately and appropriately, and thus a liquid (ink) with excellent responsiveness can be ejected.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise of the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the ejection port, the liquid passage, and the electrothermal converter (the straight liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose a configuration in which a heat acting portion is arranged in a bending region.

In addition, JP-A-59-123670 discloses a structure in which a common slit is used as a discharge portion of the electrothermal converter for a plurality of electrothermal converters, and a pressure wave of thermal energy is absorbed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 59-138461, which discloses a configuration in which an opening corresponds to a discharge portion.

Further, a full line type recording head having a length corresponding to the width of the maximum recording medium which can be recorded by the recording apparatus is a combination of a plurality of recording heads as disclosed in the above-mentioned specification. Either the structure that satisfies the length or the structure as one recording head integrally formed may be used, but the present invention can more effectively exhibit the above-described effects.

In addition, by being attached to the apparatus main body, it can be electrically connected to the apparatus main body and can be supplied with ink from the apparatus main body by a replaceable chip type recording head or the recording head itself. The present invention is also effective when a cartridge-type recording head provided with an ink tank is used.

Further, it is preferable to add a preliminary auxiliary means for the recording head, which is provided as a structure of the recording apparatus of the present invention, because the effect of the present invention can be further stabilized. Specific examples thereof include cleaning means for the recording head, preheating means by an electrothermal converter or a heating element other than this, or a combination thereof, and a preliminary ejection mode for performing ejection different from recording. Doing is also effective for stable recording.

Further, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but the recording head may be integrally formed or a plurality of combinations may be used. The present invention is also extremely effective for a device provided with at least one of full colors by color mixing.

In the embodiments of the present invention described above, the ink is described as a liquid, but it is an ink that solidifies at room temperature or lower and softens at room temperature, or is a liquid, or the above-mentioned. In the inkjet method, the temperature of the ink itself is generally adjusted within a range of 30 ° C. or higher and 70 ° C. or lower to control the temperature of the ink so that the viscosity of the ink is within a stable ejection range. Any material that is in liquid form may be used.

In addition, the temperature rise due to the thermal energy is positively prevented by using it as the energy for changing the state of the ink from the solid state to the liquid state, or the ink is solidified in a standing state for the purpose of preventing evaporation of the ink. In some cases, such as ink that is liquefied by applying heat energy according to a recording signal and ejected as a liquid ink, or one that has already started to solidify when it reaches a recording medium. The use of an ink having a property of being liquefied only by heat energy is also applicable to the present invention. In such a case, the ink is disclosed in JP-A-54-5684.
No. 7 or Japanese Patent Laid-Open No. 60-71260, a mode in which it is opposed to the electrothermal converter in the state of being held as a liquid or solid in the recesses or through holes of the porous sheet. Also good. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition, as a form of the recording apparatus according to the present invention, in addition to the one provided integrally or separately as an image output terminal of information processing equipment such as a word processor or a computer, a copying apparatus combined with a reader, It may take the form of a facsimile machine having a transmission / reception function.

[0040]

As described above, according to the present invention, the speed detecting means for detecting the moving speed of the recording medium in a non-contact manner, and the drive signal is applied to the recording means based on the speed detected by the speed detecting means. By including the control means, even when the moving speed of the recording medium is not constant due to the eccentricity of the rotating drum or the change in the diameter due to the temperature change, the ink is attached to a desired position in the moving direction of the recording medium. As a result, good recording with little disturbance can be performed.

Further, the rotary drum is composed of a cylindrical portion partially made of a transparent member, a rotary shaft, and a fixed shaft, and a laser is provided at a position of the rotary drum facing the recording means with the transparent member interposed therebetween. By fixing the Doppler type speed sensor, in addition to the same effects as described above, the laser Doppler type speed sensor is inside the rotating drum, so there is no interference with other components and the flexibility of the device configuration is hindered. There is an effect that it cannot be done.

In this case, a laser beam reflecting film for reflecting the laser beam from the laser Doppler type velocity sensor is formed on a portion of the cylindrical portion which is made of a transparent member, whereby the outer peripheral surface of the cylindrical portion is rotated. Since the speed is detected, the moving speed of the recording medium can be approximately detected even if the recording medium has a property of hardly reflecting the laser beam from the laser Doppler type speed sensor.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of an inkjet recording apparatus of the present invention.

FIG. 2 is a perspective view of a main part of the recording head shown in FIG.

FIG. 3 is a schematic configuration diagram of a second embodiment of the inkjet recording apparatus of the present invention.

FIG. 4 is a schematic configuration diagram of a third embodiment of the inkjet recording apparatus of the present invention.

FIG. 5 is a schematic configuration diagram of a conventional inkjet recording apparatus.

[Explanation of symbols]

 1, 21a, 21b, 21c, 21d Recording head 1a Discharge port surface 1b Discharge port 1c Common liquid chamber 1d Liquid path 1e Electrothermal converter 2, 22 Carriage 3, 23 Guide rail 4, 24 Carriage motor 5, 25 Drive pulley 6 , 26 driven pulley 7, 27 wire 8, 28, 48 rotary drum 8a rotary shaft 8b fixed shaft 8c, 48c cylindrical portion 9, 29, 49 recording medium 10, 30 drum motor 12, 32 head recovery device 12a cap 15, 35 , 55 Laser Doppler type speed sensor 16, 36 Processing circuit 17, 37 Control circuit 48d Laser light reflection film

Claims (5)

[Claims] 1. A recording means for adhering ink to a recording medium by applying a drive signal, and a rotary drum which is wound around the recording medium to hold the recording medium in close contact with the recording medium and is rotatably disposed opposite to the recording means. Then, in a recording apparatus for adhering ink to the recording medium by the recording means while rotating the rotating drum, a speed detection for non-contact detection of the moving speed of the recording medium accompanying the rotation of the rotating drum. And a control means for applying a drive signal to the recording means each time the recording medium moves by a predetermined amount, based on the moving speed of the recording medium detected by the speed detecting means. Characteristic recording device. 2. A recording means for adhering ink to a recording medium by application of a drive signal, and a rotating drum which is wound around the recording medium to hold the recording medium in close contact with the recording medium and is rotatably disposed opposite to the recording means. Then, in the recording device for adhering the ink to the recording medium by the recording means while rotating the rotary drum, the rotary drum has a cylindrical portion at least a part of which is made of a transparent member, and The rotary shaft is disposed at the axial center of the cylindrical portion and fixed to the cylindrical portion, and the fixed shaft is rotatably fitted to the rotary shaft and fixed to the recording apparatus main body. , Irradiating the recording medium, which is fixed at a position facing the recording unit with the transparent member interposed therebetween, with the laser beam, and changes the frequency of the reflected laser beam to change the speed of the recording medium. A laser Doppler speed sensor for detecting, and a control means for applying an ejection signal to the recording means every time the signal is output by a predetermined number, based on a periodic signal output from the laser Doppler speed sensor, A recording apparatus having: 3. The recording apparatus according to claim 2, wherein a laser light reflection film that reflects the laser light from the laser Doppler type speed sensor is formed in a portion formed by a transparent member in the cylindrical portion. . 4. The recording apparatus according to claim 1, 2 or 3, wherein the recording means includes an electrothermal converter for generating thermal energy for ejecting ink. 5. The recording apparatus according to claim 4, wherein the recording means ejects the ink from the ejection port by utilizing the film boiling generated in the ink by the thermal energy applied by the electrothermal converter.