JPH0930008A - Inkjet printer recording head cleaning device - Google Patents

Abstract

(57) Abstract: A wasteful operation is omitted by appropriately performing an ejection recovery operation such as suction or preliminary ejection from a recording head and a wiping operation. SOLUTION: When the number of dots (ink ejection amount) DCNT by the recording head becomes a reference value n2 or more (S25:
YES), wipe the recording head with the wiper (cleaning process 4). The number of dots is small even if the line feed amount LCNT of the recording paper becomes the reference value n1 or more (S20: YES, S40: N
O), the suction from the recording head and the preliminary ejection are "weak".
And wipe with a wiper (cleaning process 2). LCN
The number of dots is large when T is the reference value n1 or more (S20: YE
S, S40: YES), only preliminary injection is performed “weakly” and wiped with the wiper (cleaning process 3). When the non-recording time T continues for a predetermined time T1 or more (S15: YES),
Suction and preliminary injection are performed “strongly” and wiped with a wiper (cleaning process 1).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in an ink jet printer provided with a recording head for ejecting ink onto a recording medium and a conveying means for conveying the recording medium.
The present invention relates to a recording head cleaning device for an inkjet printer that cleans the recording head.

[0002]

2. Description of the Related Art Conventionally, as a device of this type, a mechanism for sucking ink from a recording head, a mechanism for causing the recording head to perform preliminary ink ejection, or a surface of the recording head where an ink ejection port is present is wiped. It is known to have a mechanism for doing so. A mechanism that sucks ink from the recording head,
Such as a mechanism that causes the recording head to perform preliminary ejection of ink,
In the so-called ejection recovery mechanism, it is possible to perform a so-called ejection recovery operation that particularly well prevents the occurrence of ejection failure due to thickening of the ink in the ink ejection port, and the surface where the ink ejection port of the recording head exists. With the so-called wiper mechanism for wiping, it is possible to particularly effectively prevent the disturbance of the recorded image by removing foreign matter and residual ink around the ink ejection port. It should be noted that the ejection recovery mechanism has an effect of removing foreign matter and residual ink, and the wiper mechanism has an effect of preventing ejection failure to some extent.

[0003]

However, in the prior art,
These ejection recovery operation, wiping operation and the like (generally referred to as cleaning operation) are performed based on only the number of lines printed by the inkjet printer and the duration of the non-recording state of the printer. Therefore, printing is actively performed, and the same operation is performed when the recording head ejects a large amount of ink or when the recording head ejects almost no ink, which is a waste of the cleaning operation. was there. Further, these cleaning operations require a certain amount of time, and therefore the workability of the inkjet printer could not be sufficiently improved.

Therefore, the present invention has been made for the purpose of providing a recording head cleaning device for an ink jet printer capable of more appropriately performing a cleaning operation and omitting an unnecessary cleaning operation.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is an ink jet system comprising a recording head for ejecting ink onto a recording medium, and a conveying means for conveying the recording medium. A recording head cleaning device for an inkjet printer, which is provided in a printer and cleans the recording head, comprising: an ejection amount detection unit that detects an ejection amount of ink of the recording head; and a conveyance amount of the recording medium by the conveyance unit. When the carry amount detecting means for detecting, the cleaning means for cleaning the recording head, and the carry amount of the recording medium detected by the carry amount detecting means are equal to or more than a predetermined amount, the ejection amount detecting means detects. Cleaning control means for cleaning the recording head by the cleaning means according to the result.

According to a second aspect of the present invention, there is provided a recording head cleaning device for an ink jet printer according to the first aspect,
Further, the cleaning control means is provided with a time measuring means for measuring the duration of the non-recording state of the ink jet printer, and the cleaning control means has the duration of the non-recording state measured by the time measuring means becomes a predetermined time or more. At this time, the cleaning by the cleaning means is performed, and when the duration is less than the predetermined time, the cleaning by the cleaning means is performed according to the detection results of the transport amount detecting means and the injection amount detecting means. I am trying.

According to a third aspect of the present invention, there is provided a recording head cleaning device for an ink jet printer according to the first aspect,
The cleaning means is for cleaning the recording head in a plurality of different modes, and the cleaning control means is
When the carry amount of the recording medium detected by the carry amount detecting unit is equal to or more than the predetermined amount, the cleaning of the recording head by the cleaning unit is performed in a different manner according to the detection result of the ejection amount detecting unit. It is characterized by executing.

According to a fourth aspect of the present invention, there is provided a recording head cleaning device for an ink jet printer according to the third aspect,
Further, the cleaning control means is provided with a time measuring means for measuring the duration of the non-recording state of the ink jet printer, and the cleaning control means has the duration of the non-recording state measured by the time measuring means becomes a predetermined time or more. It is characterized in that the cleaning of the recording head by the cleaning means is performed in different modes depending on the time and the duration of the non-recording state is shorter than the predetermined time.

The invention according to claim 5 is the invention according to claim 1 or 3.
In the recording head cleaning device for an inkjet printer described above, the cleaning means performs an ejection recovery operation of the recording head by sucking ink from the recording head or by causing the recording head to perform preliminary ejection of ink. And a wiper mechanism for wiping the surface of the recording head on which the ink ejection ports are present. The cleaning control means is configured to detect the conveyance amount of the recording medium detected by the conveyance amount detection means. When the predetermined amount or more, at least the injection recovery operation by the injection recovery mechanism is executed, and when the detected transport amount is less than the predetermined amount, the wiper mechanism operates according to the detection result of the injection amount detection means. It is characterized by performing a wiping operation.

The invention according to claim 6 is the invention according to claim 2 or 4.
In the recording head cleaning device for an inkjet printer described above, the cleaning means performs an ejection recovery operation of the recording head by sucking ink from the recording head or by causing the recording head to perform preliminary ejection of ink. And a wiper mechanism for wiping the surface of the recording head where the ink ejection openings are present, the cleaning control means is the duration of the non-recording state measured by the time measuring means. When the predetermined amount of time or more is reached, and when the carry amount of the recording medium detected by the carry amount detecting means is equal to or more than the predetermined amount, at least the injection recovery operation by the injection recovery mechanism is executed, and If the duration of the non-recording state is less than the above specified time,
Further, when the conveyance amount of the recording medium is less than the predetermined amount, the wiping operation by the wiper mechanism is executed according to the detection result of the ejection amount detection means.

According to a seventh aspect of the present invention, in the recording head cleaning device for an ink jet printer according to any one of the first to sixth aspects, the recording head records an image by a dot matrix, and the ejection amount is detected. The means detects the number of dots ejected by the recording head as ink as the ejection amount.

According to an eighth aspect of the present invention, in the recording head cleaning device for an ink jet printer according to any one of the first to seventh aspects, the carry amount detecting means counts the number of line feeds to the recording medium of the ink jet printer. It is characterized by being

[0013]

According to the first aspect of the present invention having the above-described structure, the cleaning control unit causes the conveyance amount of the recording medium detected by the conveyance amount detection unit to be a predetermined amount or more. At this time, the cleaning unit cleans the recording head according to the detection result of the ink ejection amount of the recording head by the ejection amount detecting unit. The conveyance amount of the recording medium and the ink ejection amount of the recording head are related to the recording density on the recording medium,
The necessity of cleaning the recording head can be estimated based on the relationship between the two. When the conveyance amount of the recording medium is equal to or more than the predetermined amount, the present invention further detects the ink ejection amount of the recording head, and the cleaning unit cleans the recording head in consideration of the detection result. . Therefore, the recording head can be appropriately cleaned according to the ink ejection amount. Therefore, wasteful cleaning operation can be omitted and the workability of the inkjet printer can be improved.

As the cleaning means, various structures such as a mechanism for sucking ink from the recording head, a mechanism for preliminarily ejecting ink to the recording head, a mechanism for wiping the surface of the recording head on which the ink ejection ports are present, etc. Can be employed, and these configurations can be used in combination or individually.

According to a second aspect of the invention, in addition to the configuration of the first aspect, a time measuring means for measuring the duration of the non-recording state of the ink jet printer is further provided.
The cleaning control means performs cleaning by the cleaning means when the duration of the non-recording state measured by the time measuring means is equal to or longer than a predetermined time, and when the duration is less than the predetermined time. As described above, the cleaning by the cleaning unit is executed according to the detection results of the transport amount detecting unit and the injection amount detecting unit.

Therefore, when the non-recording state continues for a long time, the cleaning operation can be executed regardless of the amount of recording medium conveyed or the amount of ink ejected. The duration of the non-recording state has a very close relationship with the viscosity of the ink in the ink ejection port. Therefore, in addition to the effect of the invention described in claim 1, there is an effect that it is possible to prevent ink ejection failure and the like better.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the cleaning means can perform the cleaning on the recording head in a plurality of different modes, and the cleaning control means controls the conveyance amount of the recording medium. Is greater than or equal to the predetermined amount, the cleaning of the recording head by the cleaning unit is performed in a different manner according to the detection result of the ejection amount detection unit. Therefore, it is possible to perform a more appropriate cleaning operation on the recording head in a mode according to the ink ejection amount. Therefore,
In addition to the effect of the first aspect of the present invention, there is an effect that wasteful cleaning operation can be more satisfactorily omitted and the workability of the inkjet printer can be further improved.

According to a fourth aspect of the invention, in addition to the configuration of the third aspect, a time measuring means for measuring the duration of the non-recording state of the ink jet printer is further provided.
Then, the cleaning control means performs cleaning when the duration of the non-recording state measured by the time measuring means is equal to or longer than the predetermined time and when the duration of the non-recording state is less than the predetermined time. The cleaning of the recording head by means is performed in different ways.

Therefore, the mode of cleaning the recording head can be changed according to the duration of the non-recording state, which has a very close relationship with the viscosity increase of the ink in the ink ejection port. Therefore, in addition to the effect of the third aspect of the present invention, there is an effect that it is possible to further prevent ink ejection failure and the like.

The invention according to claim 5 is the invention according to claim 1 or 3.
In addition to the configuration described above, the cleaning unit includes an ejection recovery mechanism that performs an ejection recovery operation of the recording head by sucking ink from the recording head or causing the recording head to perform preliminary ejection of ink, and the ink of the recording head. The cleaning control means includes a wiper mechanism for wiping the surface on which the ejection port is present.
When the transport amount of the recording medium is equal to or more than the predetermined amount, at least the injection recovery operation by the injection recovery mechanism is executed, and when the transport amount is less than the predetermined amount, the wiper is detected according to the detection result of the injection amount detecting means. The feature is that the wiping operation by the mechanism is executed.

As described above, the recording density derived from the conveyance amount of the recording medium and the ink ejection amount of the recording head is mainly related to the thickening of the ink, etc., and the conveyance amount is not less than the predetermined value. By executing the ejection recovery operation at the time, it is possible to favorably prevent defective ejection of ink. Further, the ink ejection amount has a deep relationship with the stain on the surface where the ink ejection port is present, and by performing the wiping operation according to the detection result, it is possible to favorably prevent the disturbance of the recorded image. Moreover, since these cleaning operations are performed based on the parameters associated with each, the number of unnecessary operations is extremely small.

Therefore, according to the present invention, in addition to the effect of the invention described in claim 1 or 3, the ink ejection failure and the disturbance of the recorded image can be prevented more effectively, and the wasteful cleaning operation can be further eliminated. The workability of the ink jet printer can be further improved.

The invention according to claim 6 is the invention according to claim 2 or 4.
In addition to the described configuration, the cleaning means includes an ejection recovery mechanism that performs an ejection recovery operation of the recording head by sucking ink from the recording head or causing the recording head to perform preliminary ejection of ink, and an ink of the recording head. The cleaning control means includes a wiper mechanism for wiping the surface on which the ejection port is present.
When the duration of the non-recording state is equal to or longer than the predetermined time and when the transport amount of the recording medium is equal to or larger than the predetermined amount, at least the ejection recovery operation by the ejection recovery mechanism is executed to continue the non-recording state. When the time is less than the predetermined time and the transport amount of the recording medium is less than the predetermined amount, the wiping operation by the wiper mechanism is executed according to the detection result of the ejection amount detection means.

As described above, the carry amount and the duration are deeply related to the viscosity of the ink, and the jetting amount of the ink is deeply related to the dirt on the surface where the ink jet port is present. In the present invention, since the ejection recovery operation and the wiping operation are executed based on the parameters associated with each other, there is very little wasteful operation, and moreover, it is possible to satisfactorily prevent ink ejection failure and print image disturbance. You can

Therefore, according to the present invention, in addition to the effect of the invention described in claim 2 or 4, the ejection failure of the ink and the disturbance of the recorded image can be prevented more effectively, and the wasteful cleaning operation can be further eliminated. The workability of the ink jet printer can be further improved.

According to a seventh aspect of the present invention, in addition to the structure according to any one of the first to sixth aspects, the recording head records an image by a dot matrix. It is characterized in that the number of dots ejected is detected as the ejection amount. For this reason,
It is possible to easily detect the ink ejection amount with a very simple configuration.

Therefore, in the present invention, in addition to the effects of the invention described in any one of claims 1 to 6, the effect that the structure and processing of the apparatus can be simplified can be obtained. The invention described in claim 8 is characterized in that, in addition to the configuration according to any one of claims 1 to 7, the carry amount detection means counts the number of line feeds to the recording medium of the inkjet printer. Therefore, the transport amount of the recording medium can be easily detected with an extremely simple configuration.

Therefore, in the present invention, in addition to the effects of the invention described in any one of claims 1 to 7, the effect that the structure and processing of the apparatus can be simplified can be obtained.

[0029]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view schematically showing the configuration of an inkjet printer 1 according to an embodiment of the present invention. In the inkjet printer 1 of the present embodiment, the recording paper 99 as a recording medium is conveyed by the conveying roller 5 driven by the conveying motor 3, and the recording head supported by the carriage 7 is in the conveying path of the recording paper 99. 9 are arranged facing each other. The recording head 9 is a well-known one that ejects ink and records an image by a dot matrix.

The carriage 7 is fixed to a timing belt 13 driven by a carriage motor 11, and is configured to be capable of reciprocating in a direction orthogonal to the recording paper 99 conveyance direction. Further, at one end (left end in the drawing) of the moving range of the carriage 7, the following member as a cleaning means is arranged.

At the position where the carriage 7 moves to the left end in the figure and stops, a cap 21 that is in airtight contact with the recording head 9 that has moved to that position is provided, and a tube 23 is connected to the cap 21. . The tube 23 is connected to a pump 25 that sucks the ink and the like in the cap 21 together with the air, and the pump 25 discharges the sucked ink and the like to the waste ink tank 29 via the tube 27.
The pump 25 is driven by the pump motor 31. Further, a wiper 33 is provided in a path along which the recording head 9 moves from a position facing the recording paper 99 to above the cap 21 so as to be retractable according to the driving state of the solenoid 35. The wiper 33 is made of an elastic material, and is a known one that wipes the surface of the recording head 9 where the ink ejection port (not shown) is present by projecting in the movement path of the carriage 7.

Next, as shown in FIG. 2, in addition to the above-described structure, the ink jet printer 1 is provided with a paper sensor 41 for detecting the presence or absence of the recording paper 99, and a position of the carriage 7 where the recording head 9 faces the cap 21 (hereinafter referred to as an origin). Is provided with an origin sensor 43 for detecting various types of operations, an operation panel 45 for instructing various operations, and an interface 47 for receiving document data and the like from an external personal computer or the like. Solenoid driver 51 for driving solenoid 35, carriage motor 1
The first control circuit 61 is connected to the carriage motor driver 53 that drives the drive motor 1, the pump motor driver 55 that drives the pump motor 31, and the carry motor driver 57 that drives the carry motor 3.

The first control circuit 61 is also connected to the recording head 9 via a second control circuit 63 and a head driver 65, which will be described later, and internally has a memory 61a such as ROM and RAM, a central processing unit (CPU). )
The microcomputer 61b includes a programmable peripheral interface (PPI) 61c. Then, the first control circuit 61 outputs a drive signal to the recording head 9, the carriage motor 11, and the conveyance motor 3 based on the document data input via the interface 47 to perform the printing operation on the recording paper 99. A cleaning control process, which will be described later, is executed together with the well-known process to be executed.

The second control circuit 63 is composed of a hardware logic circuit, converts the drive signal (parallel data) of the recording head 9 output from the first control circuit 61 into serial data and inputs it to the head driver 65. Head driver interface 63a and a line feed counter 63b that counts the number of line feeds in the document corresponding to the drive signal.
And a dot counter 63c that counts the number of dots (the number of dots ejected by the recording head 9) corresponding to the drive signal, and the state in which the drive signal is not input and the inkjet printer 1 does not perform printing or line feed. And a timer 63d for measuring the duration of the (non-recording state). Also, a line feed counter 63b and a dot counter 63
The values of c and the timer 63d are fed back to the first control circuit 61.

Next, the cleaning control process executed by the first control circuit 61 will be described with reference to the flowchart of FIG. It should be noted that the first control circuit 61 executes this processing every predetermined period. When the process is started, first, S15
The value of the timer 63d (hereinafter referred to as the timer value T. Similarly, the values of the line feed counter 63b and the dot counter 63c are also the line feed counter value LCNT and the dot counter value DCN.
T. ) Is compared with the predetermined time T1, and if the timer value T has not reached the predetermined time T1, the process proceeds to S20. S2
At 0, the line feed counter value LCNT is compared with the first reference value n1, and if LCNT <n1, the process proceeds to S25. S2
In 5, the dot counter value DCNT is compared with the second reference value n2, and if DCNT <n2, the process proceeds to S15 again. If the non-recording state continues for a long time and T ≧ T1 while repeating the processing of S15 to S25 (S15: YE
S) and S30, and the cleaning process 1 is executed.

Here, in the ink jet printer 1 of this embodiment, after the carriage 7 is moved to the origin, the pump 2
5, a suction operation for sucking ink from the recording head 9 to drive the recording head 9, an ejection operation for moving the carriage 7 to the origin and then preliminarily ejecting ink on the recording head 9, and a solenoid 35 to move the wiper 33 to the carriage 7. It is possible to perform the above-described three cleaning operations, that is, the wiping operation of causing the recording head 9 to protrude to the movement path and wiping the surface of the recording head 9 where the ink ejection ports are present. Further, the suction operation and the injection operation are
It is possible to switch between two levels of strength. Therefore, in this embodiment,
By combining these operations, four types of cleaning processing shown in Table 1 below are set.

[0037]

[Table 1]

In S30, the cleaning process 1, that is, the suction operation and the ejection operation are performed "strongly" and the wiping operation is performed, and then the process proceeds to S35. In S35, all counter values LC
Clear NT, DCNT and timer value T to 0, and S1
Go to 5. When the line feed counter value LCNT reaches the first reference value n1 before the timer value T reaches the predetermined time T1 (S20: YES), the process proceeds to S40 and the dot counter value DCNT is compared with the third reference value n3. To do. DCN
When T ≧ n3 (S40: YES), the cleaning process 3 is executed in S45, and then the process proceeds to S35 described above, and DCNT
When <n3 is satisfied (S40: NO), the cleaning process 2 is executed in S55 and then the process proceeds to S35. The third reference value n3 may be the same as or different from the second reference value n2.

Further, if the dot counter value DCNT reaches the second reference value n2 before the timer value T reaches the predetermined time T1 and the line feed counter value LCNT reaches the first reference value n1 (S25: YES). , S60, 65 are sequentially performed, and after the cleaning process 4 is performed, the dot counter value DCNT
Is cleared to 0 and the process proceeds to S15.

Through the above processing, in this embodiment, the cleaning operation can be executed as follows. Each time the ink ejection amount (corresponding to the dot counter value DCNT) of the recording head 9 reaches a predetermined amount corresponding to the second reference value n2 (S25:
YES), the wiping operation can be executed to clean the recording head 9 (S60). It is expected that the surface of the recording head 9 where the ink ejection ports are present will become more dirty as the amount of ejected ink increases. In this case, the wiping operation can be performed to prevent the disturbance of the recorded image. it can.

Transport amount of recording paper 99 (line feed counter value LC
(Corresponding to NT) is a predetermined amount or more (S20: YES) corresponding to the first reference value n1 but the ink ejection amount is small (S40: NO), that is, the recording density on the recording paper 99 is low. Then, there is a concern that the viscosity of the ink in the ink ejection port of the recording head 9 may increase, so that the recording head 9 needs to be cleaned. In this case, as the cleaning process 2 (S55), the wiping operation and the weak ejection operation are performed, and the weak suction operation is performed. Even if the amount of recording paper 99 conveyed is large, if the amount of ink ejection is large (S40: YES), there is little concern about ejection failure. Therefore, in that case, the suction operation is omitted (cleaning process 3: S45).

If the non-recording state continues for a predetermined time T1 or more for a long time, there is a concern that the viscosity of the ink in the ink ejection port of the recording head 9 may increase. In this case (S15: YES), the recording paper 99 is conveyed. The suction operation and the ejection operation are executed “strongly” regardless of the amount and the ejection amount of ink (S30). Therefore, it is possible to favorably prevent ink ejection failure. Further, since the wiping operation is performed together with the suction operation and the ejection operation, it is possible to prevent the recorded image from being disturbed when the recording is restarted.

In the cleaning processes 1, 2, and 3, the wiper 33 wipes the ink adhered to the recording head 9 when the recording head 9 is sucked or preliminarily ejected.
As described above, in the inkjet printer 1 of the present embodiment, the duration of the non-recording state, the transport amount of the recording paper 99, and the ink ejection amount of the recording head 9 are taken into account,
The suction operation, the ejection operation, and the wiping operation can be appropriately performed. Therefore, it is possible to favorably prevent defective ejection of ink and disorder of a recorded image, and to omit wasteful cleaning operation very favorably. Further, by doing so, the time required for the cleaning operation can be shortened and the workability of the inkjet printer 1 can be improved.

Further, in this embodiment, the dot counter 63
The number of dots in the document counted in c (dot counter value DC
NT) is used for control as the ink ejection amount,
The number of line feeds of the document (line feed counter value LCNT) counted by the line feed counter 63b is used for control as the conveyance amount of the recording paper 99. Therefore, the configuration and processing relating to the detection of the injection amount and the transport amount can be extremely simplified. Further, these counting operations are executed by the second control circuit 63 configured by hardware. Therefore, in this embodiment, the load on the first control circuit 61 can be reduced to improve the processing speed, and the configuration of the device can be simplified to reduce the cost.

In the above embodiment, the transport motor 3
And the carrying roller 5 serves as a carrying means, and the dot counter 63
c is the ejection amount detection means, the line feed counter 63b is the conveyance amount detection means, the timer 63d is the time measurement means, the first control circuit 61 is the cleaning control means, and the mechanism from the cap 21 to the waste ink tank 29 is ejection recovered. The wiper 33 and the solenoid 35 correspond to a mechanism and a wiper mechanism, respectively.

Further, the present invention is not limited to the above embodiments, and can be carried out in various modes without departing from the gist of the present invention. For example, the inkjet printer 1 of the above-described embodiment includes both the ejection recovery mechanism and the wiper mechanism, but the present invention may include only one of these mechanisms, or a different type of cleaning. It can also be applied to those equipped with means. Further, the present invention is not limited to the so-called serial printer such as the inkjet printer 1 of the above-mentioned embodiment,
It can also be applied to a line printer.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a configuration of an inkjet printer according to an embodiment.

FIG. 2 is a block diagram showing a configuration of a control system of the inkjet printer.

FIG. 3 is a flowchart showing a cleaning control process executed by the control circuit.

[Explanation of symbols]

1 ... Inkjet printer 3 ... Conveyor motor
5 ... Conveyor roller 7 ... Carriage 9 ... Recording head
11 ... Carriage motor 21 ... Cap 25 ... Pump
29 ... Waste ink tank 31 ... Pump motor 33 ... Wiper
35 ... Solenoid 61 ... First control circuit 63 ... Second control circuit
63b ... Line feed counter 63c ... Dot counter 63d ... Timer
99 ... Recording paper

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B41J 2/125

Claims (8)

[Claims] 1. A recording head cleaning device for an inkjet printer, comprising: a recording head for ejecting ink onto a recording medium; and a conveying means for conveying the recording medium, the inkjet head cleaning the recording head. An ejecting amount detecting means for detecting the ejecting amount of ink of the recording head; a conveying amount detecting means for detecting the conveying amount of the recording medium by the conveying means; a cleaning means for cleaning the recording head; Cleaning control means for cleaning the recording head by the cleaning means according to the detection result of the ejection amount detection means when the conveyance amount of the recording medium detected by the amount detection means becomes equal to or more than a predetermined amount. A recording head cleaning device for an ink jet printer, comprising: 2. The recording head cleaning device for an ink jet printer according to claim 1, further comprising time measuring means for measuring a duration of a non-recording state of the ink jet printer, wherein the cleaning control means comprises the time measuring means. When the duration of the non-recording state measured in step 3 is equal to or longer than a predetermined time, cleaning by the cleaning unit is performed, and when the duration is less than the predetermined time, the conveyance amount detection unit and the injection amount A recording head cleaning device for an inkjet printer, wherein cleaning is performed by the cleaning unit according to a detection result of the detection unit. 3. The recording head cleaning device for an ink jet printer according to claim 1, wherein the cleaning means performs cleaning on the recording head in a plurality of different modes, and the cleaning control means comprises the conveyance means. When the carry amount of the recording medium detected by the amount detecting means becomes equal to or more than the predetermined amount, the cleaning of the recording head by the cleaning means is executed in a different manner according to the detection result of the ejection amount detecting means. A recording head cleaning device for an inkjet printer, which is characterized in that 4. The recording head cleaning device for an ink jet printer according to claim 3, further comprising time measuring means for measuring the duration of the non-recording state of the ink jet printer, wherein the cleaning control means is the time measuring means. The cleaning of the recording head by the cleaning means is different depending on whether the duration of the non-recording state measured in step 3 is longer than or equal to a predetermined time or the duration of the non-recording state is less than the predetermined time. A recording head cleaning device for an inkjet printer, characterized in that the recording head cleaning device is executed in a mode. 5. The recording head cleaning device for an ink jet printer according to claim 1, wherein the cleaning means sucks ink from the recording head or causes the recording head to perform preliminary ejection of ink. Includes a jetting recovery mechanism for performing a jetting recovery operation of the recording head, and a wiper mechanism for wiping the surface of the recording head on which the ink jetting ports are present, and the cleaning control means is detected by the carry amount detecting means. When the conveyed amount of the recording medium is equal to or more than the predetermined amount, at least the ejection recovery operation by the ejection recovery mechanism is executed, and when the detected conveyed amount is less than the predetermined amount, the ejection amount detection means A recording head cleaning device for an inkjet printer, wherein the wiping operation is performed by the wiper mechanism according to the detection result of the recording head cleaning device. 6. The recording head cleaning device for an ink jet printer according to claim 2, wherein the cleaning means sucks ink from the recording head or causes the recording head to perform preliminary ejection of ink. The cleaning control means includes an ejection recovery mechanism that performs an ejection recovery operation of the recording head, and a wiper mechanism that wipes the surface of the recording head on which the ink ejection ports are present, and the cleaning control means is measured by the time measuring means. When the duration of the non-recording state is equal to or more than the predetermined time, and when the carry amount of the recording medium detected by the carry amount detecting unit is equal to or more than the predetermined amount,
At least performing the injection recovery operation by the injection recovery mechanism, the duration of the non-recording state is less than the predetermined time,
A recording head cleaning device for an inkjet printer, wherein when the amount of conveyance of the recording medium is less than the predetermined amount, the wiping operation by the wiper mechanism is executed according to the detection result of the ejection amount detection means. 7. The recording head cleaning device for an ink jet printer according to claim 1, wherein the recording head records an image by a dot matrix, and the ejection amount detecting means includes the recording head. A recording head cleaning device for an inkjet printer, wherein the number of dots ejected by the ink is detected as the ejection amount. 8. The recording head cleaning device for an ink jet printer according to claim 1, wherein the carry amount detecting means counts the number of line feeds to the recording medium of the ink jet printer. Characteristic ink jet printer recording head cleaning device.