JP2020082572A - Printer - Google Patents

Abstract

To reduce web which is wasted.SOLUTION: When printing is performed based on a printing job, a control unit 6 executes control so as to perform printing by printing units 4A and 4B while carrying a web W at a printing carrying speed Vg after starting carrying of the web W via a carrying part 3 and accelerating the carrying speed to a prescribed printing carrying speed Vg. When printing based on a printing job is performed, if a residual quantity of the web W is less than a length of the web W required for completing the printing based on the printing job in a case of starting the printing after the carrying speed of the web W has reached the printing carrying speed Vg and is equal to or greater than a length of the web w required for completing the printing based on the printing job in a case of starting the printing at the start of carrying of the web W, the control unit 6 starts the printing by the printing unit 4A and 4B between the start of carrying of the web W and when the carrying speed has reached the printing carrying speed Vg so that the printing can be completed based on the printing job with the residual quantity of the web W.SELECTED DRAWING: Figure 1

Description

The present invention relates to a printing device that prints on a web.

2. Description of the Related Art There is known a printing apparatus that prints on a web by ejecting ink from an inkjet head while continuously conveying a long web as a print medium (see Patent Document 1).

In such a printing apparatus, the behavior of the web is not stable and the web just below the inkjet head may move up and down during acceleration after the web is started to be conveyed. For this reason, when ink is ejected from the inkjet head to perform printing while the web is being accelerated, the landing deviation of the ink may occur and the print image quality may deteriorate.

Therefore, printing is not performed while the web is accelerating, and after the web reaches a predetermined print transport speed, the web may be transported at a constant print transport speed while ejecting ink from the inkjet head to perform printing. It is being appreciated.

JP, 2013-71323, A

However, when printing is started after the web reaches the print transport speed as described above, the portion of the web that is transported under the inkjet head from the start of transport until the print transport speed is reached does not print. It is not used and is wasted (waste paper).

The present invention has been made in view of the above, and an object of the present invention is to provide a printing apparatus capable of reducing wasted web.

In order to achieve the above-mentioned object, the printing apparatus of the present invention includes a transport unit that transports a web, a print unit that prints on the web that is transported by the transport unit, and a print unit that performs printing based on a print job. A control unit that controls to perform printing by the printing unit while transporting the web and accelerating the transport speed to a predetermined print transport speed, and then transporting the web at the print transport speed. When performing printing based on a print job, the remaining amount of the web is the length required to complete the printing based on the print job when printing is started after the web transport speed reaches the print transport speed. If the length is less than the length and the length is equal to or more than the length required to complete the printing based on the print job when the printing is started when the web is started to be conveyed, the printing based on the print job is performed based on the remaining amount of the web. The printing by the printing unit is started before the web transport speed reaches the print transport speed so as to be completed.

According to the printing apparatus of the present invention, wasteful webs can be reduced.

1 is a schematic configuration diagram of a printing apparatus according to an embodiment. FIG. 2 is an enlarged perspective view of a main part of a web roll holding unit of the printing apparatus shown in FIG. 2 is a control block diagram of the printing apparatus shown in FIG. 1. FIG. 3 is a flowchart for explaining the operation of the printing apparatus shown in FIG. FIG. 9 is an explanatory diagram of a printing operation in a normal mode and a web loss reduction mode.

Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, the same or equivalent parts or components are designated with the same or equivalent reference numerals.

The embodiments described below exemplify devices and the like for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, arrangement, etc. of each component. Is not specified below. The technical idea of the present invention can be modified in various ways within the scope of the claims.

FIG. 1 is a schematic configuration diagram of a printing apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a main part of the web roll holding unit of the printing apparatus shown in FIG. FIG. 3 is a control block diagram of the printing apparatus shown in FIG. In the following description, the direction orthogonal to the paper surface of FIG. 1 is the front-back direction, and the paper surface front direction is the front. Further, the up, down, left and right of the paper surface in FIG.

As shown in FIGS. 1 and 3, the printing apparatus 1 according to the present embodiment includes a web roll holding unit 2, a transport unit 3, printing units 4A and 4B, a winding unit 5, and a control unit 6. Equipped with.

The web roll holder 2 holds the web roll 7. The web roll 7 is formed by winding a web W, which is a long print medium made of film, paper, or the like, into a roll shape. As shown in FIGS. 1 to 3, the web roll holding unit 2 includes a web roll support shaft 11, a brake mechanism 12, an intermediate gear 13, and a brake gear sensor 14.

The web roll support shaft 11 rotatably supports the web roll 7. The web roll support shaft 11 is formed in an elongated shape extending in the front-rear direction. The web roll support shaft 11 is, for example, an air shaft. A web roll support shaft gear 11 a meshing with the intermediate gear 13 is fixed to the rear end portion of the web roll support shaft 11.

The brake mechanism 12 brakes the rotation of the web roll 7 by braking the rotation of the web roll support shaft 11. That is, the brake mechanism 12 applies a brake torque (braking force) to the web roll support shaft 11, which is a torque (load torque) in a direction opposite to the rotation direction (clockwise direction in FIG. 1) when the web W is unwound. Give. The brake mechanism 12 is, for example, a powder brake.

The brake mechanism 12 has an output shaft 12a that outputs a brake torque. A brake gear 12b is attached to the output shaft 12a. The brake torque of the brake mechanism 12 is transmitted to the web roll support shaft 11 via the brake gear 12b, the intermediate gear 13, and the web roll support shaft gear 11a, so that the web roll support shaft 11 is braked.

The intermediate gear 13 transmits the brake torque of the brake mechanism 12 to the web roll support shaft gear 11a. The intermediate gear 13 meshes with the web roll support shaft gear 11a and the brake gear 12b.

The brake gear sensor 14 detects the teeth of the brake gear 12b.

The transport unit 3 transports the web W. The conveying unit 3 includes guide rollers 21 to 30, 20 lower head rollers 31, a meandering control unit 32, a pair of conveying rollers 33, a conveying motor 34, a motor encoder 35, and roller encoders 36A and 36B. Equipped with.

The guide rollers 21 to 30 guide the web W transported in the transport unit 3. The guide rollers 21 to 30 are driven to rotate by the conveyed web W. The guide rollers 21 to 30 are formed in a long shape extending in the front-rear direction. The guide rollers 21 to 30, the lower head roller 31, the conveyance roller 33, and the meandering control rollers 37 and 38 of the meandering control unit 32, which will be described later, form a conveyance path of the web W in the conveyance unit 3.

The guide rollers 21 and 22 guide the web W between the web roll 7 and the meandering controller 32. The guide roller 21 is arranged near the right side of the web roll holding unit 2. The guide roller 22 is arranged between the guide roller 21 and a meandering control roller 37 of a meandering controller 32 described later.

The guide rollers 23 to 29 guide the web W between the meandering controller 32 and the conveyance roller 33. The guide roller 23 is arranged slightly above and to the left of a meandering control roller 38 of a meandering controller 32, which will be described later. The guide roller 24 is arranged above the guide roller 23. The guide roller 25 has the same height as the guide roller 24 and is arranged to the right of the guide roller 24. The guide roller 26 is arranged below the guide roller 25 and higher than the guide roller 23. The guide roller 27 is arranged on the left side of the guide roller 26, in the vicinity of the right side of the web W between the guide rollers 23 and 24, and at substantially the same height as the guide roller 26. The guide roller 28 is arranged on the lower right side of the guide roller 27. The guide roller 29 is disposed on the lower right side of the guide roller 28.

The guide roller 30 guides the web W between the transport roller 33 and the winding unit 5. The guide roller 30 is arranged near the left side of the winding unit 5.

The lower head roller 31 supports the web W under the head unit 41 described later between the guide rollers 24 and 25 and between the guide rollers 26 and 27. The lower head roller 31 is formed in an elongated shape extending in the front-rear direction. Ten lower head rollers 31 are arranged between the guide rollers 24 and 25 and between the guide rollers 26 and 27. Two lower head rollers 31 are arranged immediately below each head unit 41. The lower head roller 31 rotates following the conveyed web W.

The meandering controller 32 corrects meandering, which is a variation in the position of the web W in the width direction (front-back direction). The meandering controller 32 includes meandering control rollers 37 and 38.

The meandering control rollers 37 and 38 are rollers for guiding the web W and correcting the meandering of the web W. The meandering control rollers 37 and 38 are formed in a long shape extending in the front-rear direction. The meandering control rollers 37 and 38 are driven to rotate by the conveyed web W. The meandering control rollers 37 and 38 are rotated by a motor (not shown) so as to be inclined with respect to the width direction of the web W when viewed in the left-right direction, thereby moving the web W in the width direction and correcting the meandering. The meandering control roller 37 is arranged to the right of the guide roller 22. The meandering control roller 38 is arranged above the meandering control roller 37.

The pair of transport rollers 33 transport the web W toward the winding unit 5 while nipping the web W. By the conveyance of the web W by the conveyance rollers 33, the web roll 7 rotates together with the web roll support shaft 11, and the web W is pulled out from the web roll 7. One of the pair of transport rollers 33 is rotationally driven by the transport motor 34, and the other of the transport rollers 33 is driven to rotate by the one of the transport rollers 33. The pair of transport rollers 33 are arranged between the guide rollers 29 and 30.

The carry motor 34 rotationally drives one of the pair of carry rollers 33.

The motor encoder 35 outputs a pulse signal for each predetermined rotation angle of the output shaft of the carry motor 34.

The roller encoder 36A outputs a pulse signal for each predetermined rotation angle of the guide roller 24. The roller encoder 36B outputs a pulse signal for each predetermined rotation angle of the guide roller 26.

The printing units 4A and 4B print on the web W transported by the transport unit 3. The printing units 4A and 4B print on the front surface and the back surface of the web W, respectively. The printing unit 4A is arranged near the upper portion of the web W between the guide rollers 24 and 25. The printing unit 4B is arranged near the upper portion of the web W between the guide rollers 26 and 27. The printing units 4A and 4B each include five head units 41.

The head unit 41 has an inkjet head (not shown), and ejects ink from the nozzles of the inkjet head onto the web W to print an image. In each of the printing units 4A and 4B, the five head units 41 eject ink of different colors.

The winding unit 5 winds the web W printed by the printing units 4A and 4B. The winding unit 5 includes a winding shaft 46 and a winding motor 47.

The winding shaft 46 winds and holds the web W. The winding shaft 46 is formed in an elongated shape extending in the front-rear direction.

The winding motor 47 rotates the winding shaft 46 in the clockwise direction in FIG. 1. The web W is wound around the winding shaft 46 by the rotation of the winding shaft 46.

The control unit 6 controls the operation of the entire printing apparatus 1. The control unit 6 includes a CPU, a RAM, a ROM, a hard disk, and the like.

When performing printing based on a print job, the control unit 6 starts transporting the web W by the transport unit 3 and accelerates the transport speed to a predetermined print transport speed Vg, and then transports the web W at the print transport speed Vg. At the same time, control is performed so that printing is performed by the printing units 4A and 4B. The print transport speed Vg is a speed set as the transport speed of the web W during printing by the printing units 4A and 4B.

Here, in the web loss reduction mode described later, when performing printing based on a print job, the control unit 6 sets the remaining amount Lr of the web W to be less than the normal printing required amount Ls and not less than the forward printing required amount Le. In some cases, the printing units 4A and 4B are provided from the start of the conveyance of the web W until the conveyance speed reaches the print conveyance speed Vg so that the printing based on the print job can be completed by the remaining amount Lr of the web W. To start printing.

The normal printing required amount Ls is the length of the web W required to complete the printing based on the print job when the printing is started after the transportation speed of the web W reaches the printing transportation speed Vg. The frontward printing required amount Le is the length of the web W required to complete the printing based on the print job when the printing is started when the conveyance of the web W is started.

The control unit 6 can select either the above-described web loss reduction mode or the normal mode. The web loss reduction mode is a mode in which the wasted web W can be reduced as compared with the normal mode.

The normal mode is a mode in which a normal printing operation is performed regardless of the remaining amount Lr of the web W. That is, in the normal mode, the control unit 6 controls the printing unit after the transport speed of the web W reaches the print transport speed Vg regardless of whether the remaining amount Lr of the web W is less than the normal printing required amount Ls. Control to start printing by 4A and 4B.

Here, after the conveyance of the web W is started, the behavior of the web W is not stable during acceleration until the conveyance speed reaches the print conveyance speed Vg, and the web W immediately below the head unit 41 of the printing units 4A and 4B is not stabilized. May move up and down. For this reason, when ink is ejected from the inkjet head of the head unit 41 to perform printing while the web W is being accelerated, the landing deviation of the ink may occur and the print image quality may deteriorate. That is, in the web loss reduction mode, when printing by the printing units 4A and 4B is started before the transport speed of the web W reaches the print transport speed Vg, the print quality of the page printed during the acceleration of the web W is reduced. May decrease.

On the other hand, when printing is started after the transport speed of the web W reaches the print transport speed Vg, good print image quality is secured, but the portion of the web W transported under the inkjet head during acceleration is printed. It is not used for and is wasted.

On the other hand, in the printing apparatus 1, a normal mode and a web loss reduction mode are prepared in order to cope with a user who attaches importance to print image quality and a user who wants to allow the reduction of print image quality and suppress waste of the web W. ing.

Next, the operation of the printing apparatus 1 will be described.

FIG. 4 is a flowchart for explaining the operation of the printing apparatus 1. The process of the flowchart of FIG. 4 is started by inputting a print job to the printing device 1 from an external device such as a personal computer, and by instructing to restart printing based on the print job that was interrupted due to a web break. Becomes

Here, the web break means that there is no web W available for printing in the web roll 7 held by the web roll holding unit 2. An instruction to restart printing based on a print job that has been interrupted due to a web break is issued, for example, by a user operating an operation input unit (not shown) after installing a new web roll 7.

In step S1 of FIG. 4, the control unit 6 determines whether the normal mode is set among the normal mode and the web loss reduction mode. Here, the normal mode and the web loss reduction mode can be set, for example, by the user operating the operation input unit.

When it is determined that the normal mode is set (step S1: YES), the control unit 6 starts the conveyance of the web W in step S2. Specifically, the control unit 6 starts driving the carry motor 34 and the winding motor 47.

Here, when the web roll 7 is to be continuously used after the end of the previous print job, the value of the brake torque T at the end of the previous print job is set in the brake mechanism 12. On the other hand, when a new web roll 7 is used, the brake mechanism 12 is set with a value of the brake torque T according to the outer diameter D of the web roll 7 calculated in the roll diameter acquisition operation described later. Tension is applied to the web W by braking the web roll support shaft 11 by the brake mechanism 12.

When the conveyance of the web W is started, the control unit 6 accelerates the conveyance speed of the web W by the conveyance rollers 33 with a predetermined acceleration from the time when the conveyance is started.

After the conveyance of the web W is started, in step S3, the control unit 6 determines whether the conveyance speed of the web W has reached the print conveyance speed Vg. When determining that the transport speed of the web W has not reached the print transport speed Vg (step S3: NO), the control unit 6 repeats step S3.

When it is determined that the transport speed of the web W has reached the print transport speed Vg (step S3: YES), the control unit 6 transports the web W at the print transport speed Vg at a constant speed in step S4. The motor 34 and the winding motor 47 are controlled.

Next, in step S5, the control unit 6 causes the printing units 4A and 4B to start printing based on the print job. At the time of printing, the control unit 6 controls the ejection timing of ink in each inkjet head of the printing unit 4A based on the output pulse signal of the roller encoder 36A. Further, the control unit 6 controls the ejection timing of ink in each inkjet head of the printing unit 4B based on the output pulse signal of the roller encoder 36B.

Here, after the constant speed conveyance of the web W at the print conveyance speed Vg is started, the control unit 6 keeps the conveyance speed of the web W constant at the print conveyance speed Vg based on the output pulse signal of the motor encoder 35. The transport motor 34 is controlled so that The conveyance speed of the web W is kept constant in order to prevent landing deviation of the ink ejected from the head unit 41 onto the web W and obtain a good print image quality.

Specifically, the control unit 6 calculates the rotation speed of the carry motor 34 based on the output pulse signal of the motor encoder 35, and calculates the carry speed of the web W corresponding to the rotation speed. Then, the control unit 6 controls the carry motor 34 so that there is no difference between the calculated carry speed and the print carry speed Vg. As a result, the conveyance speed of the web W by the conveyance motor 34 is controlled so as to match the print conveyance speed Vg.

Further, while the web W is being conveyed, the control unit 6 controls the brake torque T of the brake mechanism 12 according to the outer diameter D of the web roll 7 so that the tension of the web W maintains the set tension F.

Here, at the start point of the constant speed conveyance of the web W at the print conveyance speed Vg, the decrease amount of the outer diameter D of the web roll 7 from the start point of the conveyance of the web W is small. That is, the outer diameter D of the web roll 7 is substantially constant until the start of the constant speed conveyance of the web W at the print conveyance speed Vg. Therefore, the brake torque T of the brake mechanism 12 is set to the value at the time when the web W is started to be transferred until the start of the constant speed transfer of the web W at the print transfer speed Vg.

However, the outer diameter D of the web roll 7 gradually decreases with the passage of time from the start of the conveyance of the web W. On the other hand, the control unit 6 calculates the outer diameter D of the web roll 7 in real time during the constant speed conveyance of the web W at the printing conveyance speed Vg, and the braking torque T according to the calculation result is calculated. Set to 12 in real time.

Specifically, the control unit 6 calculates the number of rotations of the brake mechanism 12 (the number of rotations of the brake gear 12b) in real time based on the output signal of the brake gear sensor 14, and the calculated number of rotations is the rotation of the web roll 7. Convert to the number N. Next, the control unit 6 calculates the outer diameter D of the web roll 7 by the following formula (1) using the rotation speed N of the web roll 7 and the print conveyance speed Vg.

D=Vg/(N×π) (1)
Then, the control unit 6 calculates the brake torque T according to the outer diameter D of the web roll 7 by the following formula (2), and sets the brake torque T in the brake mechanism 12.

T=F×D/(2×G) (2)
Here, G is a reduction ratio (gear ratio) between the brake mechanism 12 and the web roll support shaft 11.

In this way, the tension of the web W is maintained at the set tension F by changing the brake torque T in real time according to the reduction of the outer diameter D of the web roll 7.

After the start of printing based on the print job, in step S6, the control unit 6 determines whether the printing based on the print job is completed.

When it is determined that the printing based on the print job is not completed (step S6: NO), the control unit 6 determines in step S7 whether the web has run out. When it is determined that the web is not broken (step S7: NO), the control unit 6 returns to step S6.

When it is determined in step S6 that the printing based on the print job is completed (step S6: YES), the control unit 6 terminates the conveyance of the web W in step S8. Specifically, the control unit 6 stops the carry motor 34 and the winding motor 47. This completes a series of printing operations.

When it is determined in step S7 that the web has run out (step S7: YES), the control unit 6 causes the printing units 4A and 4B to stop printing in step S9. After that, the control unit 6 proceeds to step S8 to end the conveyance of the web W. This completes a series of printing operations.

The brake mechanism 12 is maintained in the ON state even after the printing operation is completed. At this time, the brake torque T is maintained at the value at the end of conveyance of the web W. By keeping the brake mechanism 12 in the ON state even after the printing operation is finished, the web roll 7 is prevented from spinning and the slack of the web W is generated, so that the web W is prevented from coming into contact with the inkjet head of the head unit 41.

When the printing operation based on the next print job is performed without removing the web roll 7 after the printing operation is completed, the brake torque at the start of the conveyance of the web W is the brake at the end of the previous printing operation. The same value as the torque is used. This is because the outer diameter D of the web roll 7 at the start of the printing operation based on the next print job is the same as the outer diameter D of the web roll 7 at the end of the previous printing operation.

When it is determined in step S1 that the web loss reduction mode is set (step S1: NO), the control unit 6 determines in step S10 that the remaining amount Lr of the web W is equal to or greater than the frontward printing required amount Le or the normal printing. It is determined whether or not the amount is less than the required amount Ls (Le≦Lr<Ls).

Here, the remaining amount Lr of the web W is the length of the portion of the web W of the web roll 7 currently held in the web roll holding unit 2 that can be used for printing. The control unit 6 calculates the remaining amount Lr of the web W based on the outer diameter D of the web roll 7 and the type (thickness) of the web W.

When the web roll 7 is to be continuously used from the end of the previous print job, the control unit 6 stores the outer diameter D of the web roll 7 at the end of the previous print job, and stores the value. The remaining amount Lr of the web W is calculated using this. When a new web roll 7 is used, the control unit 6 uses the value of the outer diameter D of the web roll 7 acquired by the roll diameter acquisition operation described below executed before the start of the printing operation, and the remaining amount Lr of the web W is Lr. To calculate.

In addition, the control unit 6 calculates the frontward printing required amount Le based on the page size and the number of pages in the print job. Further, the control unit 6 calculates the required normal printing amount Ls by adding the conveyance amount of the web W during the acceleration from the start of the conveyance of the web W until the printing conveyance speed Vg is reached to the frontward printing required amount Le. ..

Then, the control unit 6 determines whether or not Le≦Lr<Ls based on the calculated remaining amount Lr of the web W, the frontward printing required amount Le, and the normal printing required amount Ls.

When it is determined that Le≦Lr<Ls is not satisfied (step S10: NO), the control unit 6 proceeds to step S2 and executes the subsequent processing.

When it is determined that Le≦Lr<Ls (step S10: YES), the control unit 6 starts the conveyance of the web W in step S11.

Next, in step S12, the control unit 6 causes the printing units 4A and 4B to start printing based on the print job from the start of the conveyance of the web W until the conveyance speed reaches the print conveyance speed Vg. At this time, the print start timing may be any timing at which the printing based on the print job can be completed by the remaining amount Lr of the web W. For example, printing may be started at the same time when the conveyance of the web W is started. After that, the control unit 6 proceeds to step S13. The processing of steps S13 and S14 is the same as the processing of steps S3 and S4 described above.

After step S14, in step S15, the control unit 6 determines whether the printing based on the print job is completed. When it is determined that the printing based on the print job is not completed (step S15: NO), the control unit 6 repeats step S15.

When it is determined that the printing based on the print job is completed (step S15: YES), the control unit 6 proceeds to step S8 and ends the conveyance of the web W. This completes a series of printing operations.

With the printing operation as described above, when Le≦Lr<Ls in the web loss reduction mode, as shown in FIG. 5, printing is performed until the transport speed of the web W reaches the print transport speed Vg. Starts, and printing based on the print job is completed without the web being cut off. On the other hand, in the normal mode, even when Le≦Lr<Ls, as shown in FIG. 5, printing is started after the transport speed of the web W reaches the print transport speed Vg. When the web runs out during the print job, printing is stopped during the print job. In addition, in FIG. 5, the Nth page is the last page of the front side and the back side in the print job. The printing start time is a time when the printing of the first page on the front surface is started.

Next, the roll diameter acquisition operation described above will be described.

The roll diameter acquisition operation is performed before the printing operation is started when the web roll 7 is replaced and the printing operation based on the print job is performed using the new web roll 7.

In the roll diameter acquisition operation, the control unit 6 conveys the web W at the roll diameter calculation conveyance speed Vc which is slower than the printing conveyance speed Vg. At this time, the control unit 6 sets the brake torque to a predetermined initial value.

While the web W is being conveyed at the roll diameter calculation conveyance speed Vc, the controller 6 calculates the rotation speed N of the web roll 7 based on the output signal of the brake gear sensor 14. Then, the control unit 6 calculates the outer diameter D of the web roll 7 by the following equation (3).

D=Vc/(N×π) (3)
When the outer diameter D of the web roll 7 is calculated, the control unit 6 calculates the brake torque T according to the calculated outer diameter D by the formula (2). Then, the control unit 6 sets the calculated brake torque T in the brake mechanism 12 and ends the conveyance of the web W. As a result, the roll diameter acquisition operation ends.

As described above, in the printing apparatus 1, when performing printing based on the print job in the web loss reduction mode, the control unit 6 sets the transport speed from the transport start of the web W when Le≦Lr<Ls. From the start of conveyance of the web W until the conveyance speed reaches the print conveyance speed Vg so that the printing based on the print job can be completed by the remaining amount Lr of the web W until the conveyance speed reaches the print conveyance speed Vg. In the meantime, printing by the printing units 4A and 4B is started. As a result, the waste of the web W is reduced by printing even while the web W is being accelerated. Further, since the replacement of the web roll 7 due to the web being cut off during the print job is reduced, the transport speed reaches the print transport speed Vg at the start of transport for restarting the print job on the new web roll 7. It is possible to reduce the waste of the web W during the period. Therefore, the printing apparatus 1 can reduce the wasted web W.

In addition, in the above-described embodiment, the inkjet type printing apparatus has been described, but another printing type such as an electrophotographic type may be used.

Further, in the above-described embodiment, the normal mode and the web loss reduction mode can be selected, but the normal mode may be omitted.

The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements within a range not departing from the gist of the invention in an implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, some constituent elements may be deleted from all the constituent elements described in the embodiments.

[Appendix]
This application discloses the following inventions.

(Appendix 1)
A transport unit for transporting the web,
A printing unit for printing on the web conveyed by the conveying unit,
When performing printing based on a print job, after the web is transported by the transport unit and the transport speed is accelerated to a predetermined print transport speed, the web is transported at the print transport speed while printing by the print unit is performed. And a control unit for controlling to perform,
When performing printing based on a print job, the control unit completes the printing based on the print job when the remaining amount of the web starts printing after the web transport speed reaches the print transport speed. If the length is less than the required length and it is more than the length required to complete the printing based on the print job when printing is started when the web starts to be conveyed, the print job is A printing apparatus, wherein printing by the printing unit is started until the web transport speed reaches the print transport speed so that the printing based on the above can be completed.

DESCRIPTION OF SYMBOLS 1 Printing device 2 Web roll holding part 3 Conveying part 4A, 4B Printing part 5 Winding part 6 Control part 7 Web roll 11 Web roll support shaft 12 Brake mechanism 13 Intermediate gear 14 Brake gear sensor 21-30 Guide roller 31 Head lower roller 32 Meandering Controller 33 Conveyor Roller 34 Conveyor Motor 35 Motor Encoder 36A, 36B Roller Encoder 37, 38 Meandering Control Roller 41 Head Unit 46 Winding Shaft 47 Winding Motor

Claims (1)

A transport unit for transporting the web,
A printing unit for printing on the web conveyed by the conveying unit,
When performing printing based on a print job, after the web is transported by the transport unit and the transport speed is accelerated to a predetermined print transport speed, the web is transported at the print transport speed while printing by the print unit is performed. And a control unit for controlling to perform,
When performing printing based on a print job, the control unit completes the printing based on the print job when the remaining amount of the web starts printing after the web transport speed reaches the print transport speed. If the length is less than the required length and is longer than or equal to the length required to complete printing based on the print job when printing is started when the web starts to be conveyed, the print job is A printing apparatus, wherein printing by the printing unit is started before the web transport speed reaches the print transport speed so that the printing based on the above can be completed.