JP2012130878A - Printing pretreatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a waste of a treatment liquid by securing coating uniformity when coating the treatment liquid on both surfaces of a paper sheet and by preventing coating of the treatment liquid to the unnecessary part in single surface printing.SOLUTION: The printing pretreatment apparatus 1 includes: a pair of coating rollers 2, 2 arranged to have a predetermined space, moved by a solenoid 12, and rotated with having the paper sheet 13 therebetween; a supply means 7 for supplying the treatment liquid to the coating rollers; sensors A and B for detecting a printed body supplied between the pair of coating rollers; and a control means 25 for controlling application of the treatment liquid on the paper sheet by moving and rotating the coating rollers with the paper sheet therebetween in accordance with detection of the paper sheet by the sensors. The coating rollers are not abutted between the carried paper sheets, and the coating liquid is applied only to the paper sheet.

Description

  The present invention relates to a printing pretreatment apparatus that applies a pretreatment liquid for printing to a sheet-like printed material such as printing paper with a roller, and is particularly applicable to double-sided coating or single-sided coating, and the coating is uniform. In addition, the present invention relates to a printing pretreatment apparatus that does not waste processing liquid.

  In a printing pretreatment apparatus that applies a printing pretreatment liquid to printing paper or the like, a type that applies a printing pretreatment liquid (hereinafter also simply referred to as a treatment liquid) to a continuous strip of paper supplied from roll paper. However, for personal use, a type in which a processing liquid is applied to a sheet-like (sheet-like) printing paper such as a commercially available standard size paper is suitable. As a pre-printing apparatus for printing intended for such a sheet-like printing paper, for example, an invention as shown in Patent Document 1 below is known.

  The liquid application device disclosed in Patent Document 1 includes an application roller that contacts a liquid holding member and receives a supply of processing liquid, and a counter roller that is provided opposite to the application roller and is urged against the application roller. Is a device that always contacts and applies the processing liquid to one side of the recording medium while nipping and conveying the recording medium supplied between both rollers.

No. 2007-018274

  According to the invention described in the above-mentioned patent document, since the application roller and the counter roller are always in contact, the processing liquid is transferred from the application roller to the counter roller, and the processing liquid applied from the application roller to the front side of the sheet. Insufficient or non-uniformity may occur, or the treatment liquid may be applied to the back side of the paper that does not require application of the treatment liquid.

  In this way, in a type of apparatus that applies a pretreatment liquid for printing on the surface of a sheet of paper using a pair of opposed rollers that also serve as a sheet transport as a coating roller, the pair of coating rollers are in constant contact with each other In the case where the application is performed by operating at the same time, both in the case of adopting a configuration in which application is performed on both sides of the paper and in the case of adopting a configuration in which application is performed only on one side, there is some problem in uniformity during application. It was happening.

  In other words, when performing application on both sides of a sheet, in consideration of the convenience of sheet discharge processing such as timing to make it easier to align discharged sheets, a certain pause interval between sheets may be used when transporting a sheet. It is necessary to take time, so that a space is also formed between the sheets passing through the pair of application rollers.

  Therefore, in the case of double-sided application, the processing liquids of both application rollers are mixed when the sheet is not sandwiched. If the processing liquids of the two application rollers are different, mixing of both liquids is naturally a problem. Further, even if both liquids are the same type of processing liquid, the storage and management state of the processing liquid in the processing liquid supply means of each coating roller is not necessarily the same, and the state of the processing liquid in each coating roller (Viscosity, concentration of each component, etc.) may not be the same. Therefore, once the two application rollers come into contact with each other and the processing liquid is mixed, the processing liquid is not always applied in the same state on both sides of the paper, and the uniformity of application on both sides of the paper may be impaired. It was.

  Also, in the case of single-sided coating, the processing liquid is applied to one of the two application rollers and the paper is nipped and transported without being applied to the other, but the processing liquid is applied in the gap between the paper before and after being transported. Since the treatment liquid is transferred from the one application roller to the other application roller to which the treatment liquid is not applied, the treatment liquid is applied non-uniformly on one side of the sheet that is not originally applied with the treatment liquid. Inconvenience occurs.

  The present invention has been made in view of the problems in the conventional technology as described above, and in application of the treatment liquid to a sheet of paper, while ensuring the application uniformity of the treatment liquid at the time of double-sided application, single-sided printing The object is to prevent the processing liquid from being applied to the unnecessary portions at times, thereby eliminating the waste of the processing liquid.

The pre-processing apparatus for printing according to claim 1 is:
In a printing pretreatment apparatus for applying a printing pretreatment liquid to a sheet-like substrate,
A pair of application rollers arranged at a predetermined interval and rotating with at least one moving to sandwich the substrate to be printed with the other;
Supply means for supplying a pretreatment liquid for printing to at least one of the pair of application rollers;
A sensor for detecting a printing material supplied between the pair of application rollers;
When the sensor detects the printing medium, at least one of the pair of application rollers is moved and rotated in a state where the printing medium is sandwiched between the two, the pretreatment liquid for printing on the printing medium Control means for controlling to apply,
It is characterized by having.

The pre-processing apparatus for printing according to claim 2 is the pre-processing apparatus for printing according to claim 1,
The width of the pair of application rollers in the rotational axis direction is smaller than the width of the printing medium.

The pre-processing apparatus for printing according to claim 3 is the pre-processing apparatus for printing according to claim 2,
A first transport roller and a second transport roller are provided upstream and downstream of the pair of application rollers in the transport direction of the printing medium, respectively.
The conveyance speed of the first conveyance roller is equal to or less than the conveyance speed of the pair of application rollers, the conveyance speed of the second conveyance roller is equal to or greater than the conveyance speed of the pair of application rollers,
In addition, the conveyance force of the second conveyance roller is smaller than the conveyance force of the pair of application rollers.

The pre-printing apparatus for printing according to claim 4 is the pre-processing apparatus for printing according to claim 3,
On the upstream side of the first conveyance roller, a pair of conveyance rollers and a pair of overlapping rollers are arranged side by side along the conveyance direction of the printing medium,
The tangential direction at the holding position of the printing medium by the pair of conveying rollers and the tangential direction at the holding position of the printing medium by the pair of overlapping rollers intersect at a predetermined angle,
It is characterized in that the front end of the subsequent printing medium conveyed by the pair of conveying rollers is overlapped and conveyed with respect to the rear end of the preceding printing medium sandwiched between the pair of overlapping rollers.

The printing pre-processing device according to claim 5 is the printing pre-processing device according to claim 4,
A storage unit that stores the pretreatment liquid for printing, a coating unit that applies the pretreatment liquid for printing in contact with the rotating application roller, and a preprocessing for printing that is stored in the storage unit It has the supply part which supplies a liquid to the said application part, and the cleaning part which contacts and cleans the said application roller to rotate, It is characterized by the above-mentioned.

  According to the pre-printing apparatus for printing described in claim 1, the pair of application rollers are arranged apart from each other by a predetermined interval, and the sensor detects that the printing medium enters between the pair of application rollers. When detected, the control means moves at least one of the application rollers at an appropriate timing, thereby sandwiching the print medium with the other application roller. By rotating the application roller in this state, the printing medium is conveyed, and the pretreatment liquid for printing is applied to the surface. In this way, since the pair of application rollers do not directly contact each other, it is possible to prevent the pretreatment liquids for printing from mixing with each other and unnecessarily transferring from one to the other.

  According to the pretreatment apparatus for printing according to claim 2, since the width of the pair of application rollers in the rotation axis direction is smaller than the width of the printing medium, the pair of application rollers is in the width direction of the printing medium. If it arrange | positions so that it may come inside rather than both edges of this, when a to-be-printed body is pinched | interposed with a pair of application | coating roller, a pair of application | coating roller will not mutually contact. The effect of the invention of claim 1 can be achieved more reliably.

  According to the pretreatment apparatus for printing according to claim 3, each speed of the first conveyance roller, the pair of application rollers, and the second conveyance roller arranged in order along the conveyance direction of the printing medium is In addition, since the conveying force of the second conveying roller is smaller than the conveying force of the pair of application rollers, the coating target is applied in the step of applying the pretreatment liquid for printing while conveying the printing medium. Since the printed body is not pulled excessively upstream and does not loosen, the application can be performed properly.

  According to the pre-printing apparatus for printing according to claim 4, while transporting the preceding printing medium in a state of being sandwiched between the pair of overlapping rollers, the subsequent printing medium is conveyed faster by the conveyance roller, The front end of the succeeding print medium conveyed by the overlap roller can be fed to the pair of application rollers in a state where the front end of the subsequent print medium is overlapped. Accordingly, the pretreatment liquid for printing is continuously applied to a plurality of sheets to be continuously conveyed while maintaining a state in which the pair of application rollers are in contact with each other with the medium to be printed interposed therebetween. Therefore, even in the case of a sheet-like printed material, the coating operation can be continuously performed in the same manner as the pretreatment liquid for printing is continuously applied to the roll paper.

  According to the pretreatment device for printing according to the fifth aspect, the supply means for applying the pretreatment liquid for printing onto the printing medium has a unit structure including the storage portion, the application portion, the supply portion, and the cleaning portion. The structure can be simplified and the manufacturing cost can be reduced. In addition, there are few liquid leaks and alterations, and storage, replacement, and other maintenance operations are easy.

It is a whole perspective view of a 1st embodiment. It is the front view which showed a part of 1st Embodiment as a cross section. It is a control block diagram of a 1st embodiment. It is a control timing diagram in a 1st embodiment. It is a control timing diagram of the modification in 1st Embodiment. It is a whole perspective view of 2nd Embodiment. It is the front view which showed a part of 2nd Embodiment as a cross section. It is a 1st continuous operation figure which shows the effect | action of 2nd Embodiment. It is a 2nd continuous operation figure which shows the effect | action of 2nd Embodiment. It is a 3rd continuous operation figure showing an operation of a 2nd embodiment. In the front view which shows the principal part of 3rd Embodiment, it is the figure which showed the supply means in the capping state by the cross section. It is a figure which shows the link mechanism of the supply means in 3rd Embodiment. It is sectional drawing which cut | disconnects and shows the supply means etc. in 3rd Embodiment in the surface orthogonal to FIG. It is sectional drawing which shows the supply means in a paper application | coating state in 3rd Embodiment by the cut surface similar to FIG. It is sectional drawing which shows the supply means in the cleaning state in 3rd Embodiment by the cut surface similar to FIG. It is sectional drawing which shows the supply means at the time of capping storage in 3rd Embodiment by the cut surface similar to FIG.

Embodiments 1 to 3 of the present invention will be described below.
These embodiments relate to a pretreatment apparatus for printing that applies a pretreatment liquid for printing (hereinafter, also simply referred to as a treatment liquid) to a sheet that is a sheet-like substrate. The treatment liquid used in the present embodiment is a treatment liquid containing a component that insolubilizes or aggregates a color material such as ink, and when applied to paper, an image such as bleeding, density, color tone, and show-through Effects such as improved formation quality or improved image fastness such as water resistance and weather resistance can be obtained.

1. 1st Embodiment (FIGS. 1-5)
As shown in FIG. 1 or FIG. 2, the printing pretreatment device 1 includes a pair of application rollers 2 and 2 that are unitized. A support arm 5 is attached to the frame 3 which is the main body of the unit via an elastic member 4. A radial motor 6 and an application roller 2 are attached to the support arm 5 and both are interlocked and connected via a belt. A processing liquid supply means 77 is provided in the frame 3. The supply means 7 includes a box-shaped storage unit 8 that stores the processing liquid, and a pre-application roller 9 that is rotatably in contact with the processing liquid 10 of the storage unit 8 and the application roller 2. When the application roller 2 is driven by the radial motor 6, the pre-application roller 9 rotates in conjunction with the application roller 2, pumps up the processing liquid 10 in the storage unit 8 and applies it to the application roller 2.

  Although not shown, a processing liquid presence / absence sensor is provided in the storage unit 8 so that the amount of the processing liquid 10 can be detected. As shown in FIG. 1, the storage unit 8 is disposed from the processing liquid supply mechanism 11 installed outside the unit. Alternatively, the treatment liquid 10 may be replenished. In this way, when the processing liquid presence / absence sensor detects that the processing liquid 10 in the storage unit 8 has become less than the specified amount, the processing unit 25 controls the storage unit 8 under the control of the control unit 25 described later. The processing liquid 10 can be replenished.

  The application roller 2 is a means for transferring the treatment liquid 10 adhering to the peripheral surface to the surface of the paper, and its width in the rotation axis direction is smaller than the width of the paper. Accordingly, when the paper is sandwiched between the pair of application rollers 2 and 2 and the relative arrangement of the two is adjusted, both ends of the application roller 2 come to the inside of the both ends of the paper so that they are outside the paper. It can be prevented from protruding. If it does in this way, it can avoid that a pair of application | coating rollers 2 and 2 do not contact at the time of application | coating, but the process liquid 10 of both the application | coating rollers 2 and 2 is mutually mixed.

  As shown in FIG. 2, each unit of the application roller 2 having such a structure is configured such that, at a predetermined home position, the pair of application rollers 2 and 2 face each other in a posture parallel to each other at a predetermined interval. Has been placed. The distance between the pair of application rollers 2 and 2 at the home position is, for example, about several millimeters or less in consideration of responsiveness. Each unit is supported so as to be movable in the horizontal direction while maintaining the parallel state of the application roller 2, and can be moved toward or away from the other by a solenoid 12 as a driving means.

  When the treatment liquid 10 is applied to both sides of the paper 13, the solenoids 12 and 12 are driven at the timing when the paper 13 is supplied between the application rollers 2 and 2 while the application rollers 2 and 2 are rotated. Then, both the application rollers 2 and 2 are moved in a direction approaching each other to sandwich the paper 13. The sheet 13 is conveyed while being sandwiched between a pair of application rollers 2 and 2. The treatment liquid 10 on the surface of each application roller 2 is applied to both sides of the paper 13. Alternatively, the position of one application roller 2 is fixed close to the position where the sheet 13 is carried in, and the other application roller 2 and 2 is rotated while the timing of the supply of the sheet 13 is adjusted. Even if only the application roller 2 is driven by the solenoid 12 and the paper 13 is nipped and conveyed in cooperation with one fixed application roller 2, the treatment liquid 10 can be applied to both surfaces of the paper 13.

Further, when the treatment liquid 10 is applied to one side of the paper 13, the position of the application roller 2 of one unit is fixed and the supply means 7 is removed or the pre-application roller 9 of the supply means 7 is moved. The supply function of the treatment liquid 10 is temporarily released, for example, by separating it from the application roller 2. While rotating both application rollers 2 and 2, only the other application roller 2 is driven by the solenoid 12 in synchronization with the supply of the paper 13, and the paper 13 is moved in cooperation with the fixed application roller 2. If nipped and conveyed, the treatment liquid 10 can be applied to only one side of the paper 13.
A cleaning roller 14 is rotatably provided on the frame 3 of the application roller 22 that is unitized. If the application roller 2 is moved by a moving means (not shown) and brought into contact with the cleaning roller 14 and rotated, dirt, foreign matter and the like attached to the peripheral surface of the application roller 2 can be removed.

  As shown in FIGS. 1 and 2, a paper feeding unit 15 is provided on the upstream side of the application roller 2. The paper feed means 15 includes a paper feed tray 16 on which the paper 13 is stacked and a pickup roller 17 that takes out the paper 13 on the paper feed tray 16 one by one. The paper feed stand 16 is provided with a paper sensor (not shown), and can detect the presence of the paper 13 and send a signal to the control means 25 described later. Between the pickup roller 17 and the application roller 2, a conveyance path 18 for the sheet 13 is provided. The conveyance path 18 extends in a horizontal direction from the paper feed table 16, and then extends in a vertical direction through a curve to reach the application roller 2. In this transport path 18, as a transport roller for transporting the paper 13 in order from the upstream side, a pair of first timing rollers R <b> 1 is provided in the horizontal portion, and a pair of second timing rollers R <b> 2 is provided in the vertical portion.

  As shown in FIGS. 1 and 2, a paper discharge table 21 as a paper discharge unit is provided on the downstream side of the application roller 2. The paper discharge table 21 is means for receiving and stacking the processed paper 13 coated with the processing liquid 10. The paper discharge table 21 is provided with a paper discharge sensor (not shown), which can detect the paper 13 discharged on the paper discharge table 21 and send a signal to the control means 25 described later. Between the coating roller 2 and the paper discharge table 21, a conveyance path 18 for the paper 13 is provided. The conveyance path 18 extends in a vertical direction from the application roller 2, and then is directed in a horizontal direction through a curve to the paper discharge table 21. In this transport path 18, as a transport roller for transporting the paper 13 in order from the upstream, a third timing roller R 3 is provided in pairs in the vertical portion, and a fourth timing roller R 4 is provided in pairs in the horizontal portion.

  In FIG. 2, the distance between the second timing roller R2 closest to the upstream side of the application roller 2 and the third timing roller R3 closest to the downstream side of the application roller 2 is the transport direction of the paper 13 (the paper 13 It is shorter than the length in the longitudinal direction perpendicular to the width direction. Therefore, while the processing liquid 10 is applied to the paper 13 by the pair of application rollers 2 and 2, the paper 13 is applied by the application roller 2 and at least one of the second and third timing rollers 20 and 22. It will be conveyed in the state pinched | interposed in two or more places.

  In the present embodiment, the conveyance speed V1 of the second timing roller R2 closest to the upstream side of the application roller 2 is equal to or lower than the conveyance speed VC of the pair of application rollers 2 and 2, and is closest to the downstream side of the application roller 2. The conveyance speed V2 of a certain third timing roller R3 is set to be equal to or higher than the conveyance speed VC of the pair of application rollers 2 and 2. That is, V1 ≦ VC ≦ V2. Therefore, when the paper 13 is transported by the pair of application rollers 2 and 2 and the second and third timing rollers 20 and 22 upstream and downstream thereof, the paper 13 is not loosened and the paper 13 is transported in a flat state. However, the treatment liquid 10 can be uniformly applied to the surface having no wrinkles. Further, in the present embodiment, the application roller 2 is set to have a larger conveying force than the third timing roller R3 that is closest to the downstream side of the application roller 2. Accordingly, an excessive tensile force is not applied to the paper 13 during the conveyance accompanying the application, and the paper 13 is damaged, or a trouble such as a problem occurs in the application of the treatment liquid 10 due to the occurrence of wrinkles due to the upstream tension. Hateful.

  As shown in FIG. 2, the sheet 13 is placed between the coating roller 2 and the second timing roller R <b> 2 closest to the upstream side so that the coating roller 2 applies the treatment liquid 10 to the sheet 13. An application timing sensor B for detection is provided. In addition, between the application roller 2 and the nearest third timing roller R3 on the downstream side thereof, other application for detecting the paper 13 is performed in order for the application roller 2 to apply the treatment liquid 10 to the paper 13. A timing sensor A is provided. Each of these application timing sensors A and B detects the presence of the sheet 13 at that position and outputs a detection signal to control the timing rollers 19, 20, 22, 23, the application roller 2 and the like described above. It can be sent to the control means 25 described later.

  As shown in FIG. 3, the pre-printing apparatus 1 for printing according to the present embodiment includes a control unit 25 that controls the entire apparatus. The control means 25 includes a CPU 26 for processing data, a ROM 27 for storing programs necessary for control, a RAM 28 for reading and writing data, a timer 29 for generating a timing signal for controlling timing, An input panel 30 for giving a stop or other operation input and a PIO 31 for inputting / outputting to / from peripheral devices of the sensor system and the drive system are provided. Signals from a paper sensor, a paper discharge sensor, a processing liquid presence / absence sensor (not shown), and the application timing sensors A and B are input to the control unit 25 via the PIO 31. Further, the control means 25 moves a motor for raising and lowering the paper feed table 16, a motor for driving the pickup roller 17 and the respective timing rollers 19, 20, 22 and 23, a radial motor 6 for driving the application roller 2, and an application roller 2. An operation signal is given through the PIO 31 to the solenoid 12 and other driving means to be operated.

Next, in the operation of the pre-printing processing apparatus 1 of the present embodiment, the control by the control means 25 when applying the processing liquid 10 to the paper 13 by the application roller 2 will be mainly described.
FIG. 4 shows an example in which the control means 25 performs control using both the two application timing sensors A and B described above. When there is an operation start input from the input panel 30, the pickup roller 17 is driven for a predetermined period in order to send the paper 13 on the paper feed tray 16 to the transport path 18. Immediately after the drive of the pickup roller 17 is started, the three timing rollers R1, 2, 3 and the fourth timing roller R4 not shown in FIG. Sent. First, the application timing sensor B upstream of the application roller 2 detects the paper 13 and turns the detection signal ON, and the processing period for one paper 13 is started. Next, the application timing sensor A located downstream detects the paper 13 and turns on the detection signal. When the detection signal of the application timing sensor A on the downstream side is turned ON, the solenoid 12 of the application roller 2 is operated at a predetermined timing according to this, and the paper 13 is sandwiched between the application rollers 2. The sheet 13 is conveyed by driving of the application roller 2 and the timing rollers R2 and 3, and the processing liquid 10 is applied to both surfaces thereof. When the application of the treatment liquid 10 to the paper 13 proceeds and the rear end of the paper 13 passes through the application timing sensor B on the upstream side of the application roller 2 and the detection signal is turned OFF, the application roller at a predetermined timing according to this. 2 solenoid 12 is operated in the reverse direction, and the pair of application rollers 2 and 2 that have sandwiched the sheet 13 are moved away from each other to release the sandwiching of the sheet 13. When the sheet 13 on which the treatment liquid 10 has been applied passes through the application timing sensor A on the downstream side of the application roller 2 and the detection signal is turned OFF, the processing period of one sheet 13 ends. The paper 13 is discharged to the paper discharge tray 21 by the fourth timing roller R4.

  FIG. 5 shows an example in which the control means 25 performs control with a simpler configuration using only the coating timing sensor B on the upstream side of the coating roller 2 out of the two coating timing sensors A and B described above. Show. When there is an operation start input from the input panel 30, the pickup roller 17 is driven for a predetermined period in order to send the paper 13 on the paper feed tray 16 to the transport path 18. Immediately after the drive of the pickup roller 17 is started, the three timing rollers R1, 2, 3 and the fourth timing roller R4 not shown in FIG. Sent. First, the application timing sensor B upstream of the application roller 2 detects the paper 13 and turns the detection signal ON, and the processing period for one paper 13 is started. When the detection signal of the application timing sensor B located upstream is turned ON, the solenoid 12 of the application roller 2 is operated at a predetermined timing according to this, and the paper 13 is sandwiched between the application rollers 2. The sheet 13 is conveyed by driving of the application roller 2 and the timing rollers R2 and 3, and the processing liquid 10 is applied to both surfaces thereof. When the application of the treatment liquid 10 to the paper 13 proceeds and the rear end of the paper 13 passes through the application timing sensor B on the upstream side of the application roller 2 and the detection signal is turned OFF, the application roller at a predetermined timing according to this. 2 solenoid 12 is operated in the opposite direction, and the pair of application rollers 2 and 2 holding the paper 13 is moved away from each other to release the holding of the paper 13 and the processing period of one paper 13 ends. To do. The paper 13 is discharged to the paper discharge tray 21 by the fourth timing roller R4.

2. Second Embodiment (FIGS. 6 to 10)
The pre-printing apparatus for printing 1 ′ of this embodiment shown in FIG. 6 or FIG. 7 has the same configuration as the pre-printing apparatus for printing 1 of the first embodiment, and the common parts are the same as those of the first embodiment. The same code | symbol is attached | subjected and the description is used. In the following, a configuration unique to the present embodiment, which is different from the first embodiment, and its operational effects will be mainly described.

  The pre-printing apparatus 1 for printing according to the first embodiment performs processing by bringing a pair of opposed application rollers 2 and 2 into contact with or separated from each other at an appropriate timing with respect to a sheet-like sheet 13 conveyed at intervals. The liquid 10 was applied only to the paper 13 so that the application rollers 2 were not in direct contact with each other between the paper 13 and the paper 13 to be carried in. On the other hand, the pre-printing processing apparatus 1 of the present embodiment pseudo-rolls a plurality of sheet-like papers 13 by conveying the sheet-like papers 13 partially overlapped one after the other in a continuous manner. In this state, the treatment liquid 10 is continuously applied by being sandwiched and conveyed by a pair of application rollers 2 and 2.

  As shown in FIGS. 6 to 7, a pair of overlapping rollers 40 is disposed between the upstream first timing roller R <b> 1 and the downstream second timing roller R <b> 2 between the coating roller 2 and the sheet feed table 16. ing. The tangential direction at the nipping position of the sheet 13 by the upstream first timing roller R1 is horizontal, and therefore the first timing roller R1 conveys the sheet 13 along the conveyance path 18 in the horizontal direction. The tangential direction at the clamping position of the overlap roller 40 downstream of the second timing roller R2 is inclined 45 degrees with respect to the horizontal direction (in FIG. 7, angle θ = about 45 °), and therefore overlap. The roller 40 conveys the sheet 13 obliquely upward along the curve of the conveyance path 18. Thus, the tangential direction at the clamping position of the upstream first timing roller R1 and the tangential direction at the clamping position of the pair of overlapping rollers 40 downstream thereof intersect at an angle θ = about 45 degrees. .

  As shown in FIG. 7, a paper sensor S1 is provided slightly downstream of the clamping position of the first timing roller R1, and a detection signal is output by capturing the timing at which the sheet 13 passes this position. It has become. The detection signal of the paper sensor S1 is input to the control means 25 and used for controlling each roller and the like as will be described later.

  As shown in FIG. 7, in the conveyance path 18 between the first timing roller R <b> 1 and the overlapping roller 40, the lower guide plate 35 is formed along the tangential direction at the holding position of the overlapping roller 40. That is, the lower guide plate 35 is inclined at 45 degrees so that the upstream side is lowered with respect to the horizontal direction. A rear end sensor S2 is provided in the vicinity of the lower guide plate 35. The trailing edge sensor S2 detects this and outputs a detection signal when the trailing edge of the sheet 13 held between the overlapping rollers 40 comes into contact with the lower guide plate 35. The detection signal of the rear end sensor S2 is input to the control means 25 and used for controlling each roller and the like as will be described later.

  That is, according to the control in the present embodiment, the first sheet roller 13 is transported by sandwiching the preceding sheet 13 between the overlapping rollers 40, and the next sheet is conveyed at an appropriate timing and speed by the first timing roller R1. If the sheet 13 is fed to the stacking roller 40, the leading edge of the succeeding sheet 13 can be overlapped with the trailing edge of the preceding sheet 13, and as a result, the two sheets 13 are partially overlapped. It can be fed into the application roller 2. Since three or more sheets 13 can also be partially overlapped continuously and conveyed as a continuous band-like sheet 13, the treatment liquid 10 is continuously applied by the application roller 2 to this. Can continue.

  Next, the above-described operation will be described in detail with reference to FIGS. 8 to 10 are divided into three diagrams for convenience of illustration, but the content is a diagram continuously showing the conveyance of the paper 13, and therefore, the serial numbers ( 1) to (9) are attached, and the order of the illustrated operations in the different figure numbers is clearly indicated.

As shown in FIG. 8A, the first sheet 13 (the uppermost sheet 13) on the sheet feed table 16 is taken out by the pickup roller 17 and sent to the first timing roller R1.
As shown in FIG. 8B, the first sheet 13 is fed into the transport path 18 by the first timing roller R1.
As shown in FIG. 8 (3), the overlap roller 40 feeds the first sheet 13 into the conveyance path 18. At the timing when the first sheet 13 passes through the paper sensor S 1, the first sheet 13 on the sheet feed tray 16 is taken out by the pickup roller 17 as the next sheet 13.

As shown in FIG. 9 (4), when the trailing edge of the first sheet 13 is separated from the first timing roller R 1, the trailing edge of the first sheet 13 bent in a curved shape along the conveyance path 18. Is restored to a flat shape (linear shape in the illustrated front view) by the tension, and is detected by the rear end sensor S2 because it approaches the lower guide plate 35. At this time, the second sheet 13 is sent out by the pickup roller 17 and sent to the first timing roller R1.
As shown in FIG. 9 (5), when the trailing edge of the first sheet 13 is detected by the trailing edge sensor S2, the second sheet 13 fed to the first timing roller R1 is moved to the preceding one. The sheet 13 is sent out at a speed v1 sufficiently faster than the linear speed v2 of the sheet 13 (v1 >> v2).
As shown in FIG. 9 (6), the trailing edge of the first sheet 13 (the preceding sheet 13) and the leading end of the second sheet 13 (the following sheet 13) are overlapped by the overlapping roller 40. . Here, the conveyance speed of the sheet 13 by the first timing roller R1 and the overlapping roller 40 is made equal (v1 = v2). The overlap between the front and rear sheets 13 is about the size of the portion other than the print area, for example, the upper and lower ends are overlapped by about 5 mm each.

As shown in FIG. 10 (7), both the rear end of the first sheet 13 (the preceding sheet 13) and the leading end of the second sheet 13 (the following sheet 13) overlap each other. The sheet 13 is fed by the overlapping roller 40.
As shown in FIG. 10 (8), the pickup roller 17 takes out the sheet 13 (third sheet 13) on the sheet feed table 16 and sends it to the first timing roller R1. This is the same state as the first sheet 13 in FIG. 8A and the second sheet 13 in FIG.
As shown in FIG. 10 (9), when the rear end of the second sheet 13 is separated from the first timing roller R 1, the rear end of the second sheet 13 bent in a curved shape along the conveyance path 18. Is restored to a flat shape (linear shape in the illustrated front view) by the tension, and is detected by the rear end sensor S2 because it approaches the lower guide plate 35. At this time, the third sheet 13 is sent out by the pickup roller 17 and sent to the first timing roller R1.

  Thereafter, the same operation as in FIG. 9 (5) and thereafter is repeated, and the third and subsequent sheets of paper 13 are continuously overlapped partially in the same manner as the second sheet 13 to simulate a continuous band. Can be transported as a sheet 13. Each sheet 13 conveyed in such a continuous state is conveyed by the second timing roller R2 and is fed between the pair of application rollers 2 and 2 so that the processing liquid 10 is continuously applied. During this time, the pair of application rollers 2 and 2 are continuously rotated with the paper 13 sandwiched therebetween, and there is no need to repeat contact and separation.

  As described above, according to the present embodiment, a plurality of sheet-like sheets 13 fed continuously can be handled as pseudo roll paper by transporting the sheets 13 in a state where the front end and the rear end thereof are overlapped. Therefore, in the process of applying the treatment liquid 10, the pair of application rollers 2 and 2 can be always arranged and continuously operated at the nip position, so that machine vibration and noise are reduced. Further, since the application roller 2 does not move, uneven application is less likely to occur, and the stability of application is improved. Furthermore, the effect that the control of the application roller 2 at the time of application becomes simple or unnecessary is also obtained.

3. 3rd Embodiment (FIGS. 11-16)
The third embodiment relates to a modification of the supply means 7 for the processing liquid 10 provided in the unit of the application roller 2 in the printing pretreatment apparatuses 1 and 1 ′ according to the first and second embodiments described above. It is. Below, it demonstrates centering around the structure of the supply means 50. FIG. As shown in FIG. 11, in the third embodiment, there is one application roller 2, and a counter roller 51 is provided at a predetermined interval from the application roller 2. The sheet 13 is sandwiched between them, and the application roller 2 rotates in this state, whereby the treatment liquid 10 is transferred from the application roller 2 to one side of the sheet 13 and coating is performed. The other components are assumed to have the same configuration as the pre-printing processing apparatuses 1 and 1 ′ of the first and second embodiments, and the equivalent portions are shown in the drawings in the first and second embodiments. The same reference numerals are used for the description.

  The supply means 50 of the present embodiment shown in FIGS. 11 and 13 has a cartridge-like configuration that can be easily handled and replaced, and includes a storage portion 52 for the processing liquid 10 serving as a main body of the cartridge. The storage unit 52 is an elongated box corresponding to the axial length of the application roller 2 and can store the processing liquid 10 therein. The upper surface of the storage portion 52 is closed by a lid member 53, and there is an open groove along the longitudinal direction in the central portion thereof, and an application portion 54 that comes into contact with the application roller 2 is provided in the open groove so as to be able to appear and retract. ing. The application unit 54 is a member capable of impregnating and holding the treatment liquid 10, and a supply unit 55 for the treatment liquid 10 is attached to the lower end of the application unit 54 in the storage unit 52. As the material of the application part 54, for example, a nonwoven fabric such as felt or an elastic porous material such as a sponge can be used. If felt is used, the leakage of the processing liquid 10 can be reduced. The supply unit 55 is immersed in the processing liquid 10 in the storage unit 52, sucks up the processing liquid 10 and supplies it to the application unit 54. The application part 54 is urged in a direction protruding toward the upper surface side of the lid member 53 by an elastic means 56 provided on the back surface side of the lid member 53. 2, the treatment liquid 10 is transferred to the application roller 2 as the application roller 2 rotates. However, when the application liquid 2 is pressed with a certain force or more, it is retracted into the storage portion 52. Further, a cleaning unit 57 is provided on the upper surface of the storage unit 52 at positions on both sides of the application unit 54. The cleaning unit 57 has an inclined surface with the upper surface facing the application unit 54, and the application roller 2 is disposed and rotated in a concave portion constituted by two inclined surfaces, whereby the surface of the application roller 2 is rotated. Can be cleaned. The material of the cleaning unit 57 can be the same as that of the application unit 54.

  As shown in FIG. 11, the supply means 50 is accommodated in a hollow box type cartridge holder 60 with an elastic body 61 disposed between the bottom surface and the bottom surface. A rack 62 is attached to the lower portion of the cartridge holder 60 in parallel to the vertical direction. Further, the frame of the apparatus, for example, the frame of the unit of the application roller 2 (not shown in FIG. 11) is provided with a lifting motor 63, and a pinion 64 provided on the drive shaft engages with the rack 62. ing. Therefore, the cartridge holder 60 can be moved up and down by driving the lifting motor 63. The rack 62 is provided with a detection piece 65 so that the position of the detection piece 65 can be detected by a sensor (not shown).

  As shown in FIGS. 11 and 12, a support shaft 66 projects from the short side surface of the cartridge holder 60. On the other hand, a rectangular link member 67 elongated in the vertical direction is provided at a position close to the surface on the short side of the cartridge holder 60 so as to be vertically movable. A long guide groove 68 is formed in the link member 67 in the vertical direction. The support shaft 66 of the cartridge holder 60 is movably engaged with the guide groove 68 of the link member 67. Therefore, when the cartridge holder 60 moves up and down, the link member 67 also moves up and down together with the cartridge holder 60 according to the position of the cartridge holder 60. An upper limit sensor S3 is disposed at the upper limit position of the lifting range of the link mechanism, and it can be detected that the link member 67 has reached the upper limit position.

  As shown in FIGS. 11 and 13, the frame 3 of the apparatus, for example, the frame of the unit of the application roller 2 not shown in FIG. 11, is provided with a capping portion 69 and a capping motor 70 for driving the capping portion 69. . The capping unit 69 is a roller-like member provided at the tip of the curved arm 71 connected to the drive shaft of the capping motor 70.

Next, functions and effects of various functions of the supply means 50 for the treatment liquid 10 in a cartridge according to the present embodiment will be described. In FIG. 12, the movement range of the cartridge holder 60 and the support shaft 66 along the longitudinal direction of the link member 67 and the direction in which the guide groove 68 is formed is shown for each function of the supply means 50. As will be described below, the range of the length of the guide groove 68 from the position where the support shaft 66 is at the lowest position, as shown in FIG. 11, from the position where the supply means 50 reaches the other functions from the position in the capping state. It is a range for moving. The upper range is a range in which the supply unit 50 exhibits the paper coating function shown in FIG. The further upper range is a range in which the supply means 50 exhibits the cleaning function shown in FIG.
FIG. 11 shows the capping state. The cartridge holder 60 is set at the lowest position, and the application roller 2 and the supply unit 50 are separated from each other. The capping motor 70 rotates the capping portion 69 toward the cartridge holder 60, and the capping portion 69 pushes the application portion 54 of the supply means 50 into the storage portion 52. Therefore, the application part 54 is not dried.

  FIG. 14 shows the application state. In the capping state shown in FIG. 11, the capping motor 70 is driven to retract the capping portion 69 from the cartridge holder 60, and then the elevation motor 63 is driven by a necessary amount to raise the cartridge holder 60 to a predetermined application position. Set. This positioning can be performed by the detection piece 65 of the cartridge holder 60 and a sensor for detecting this. At this time, the application unit 54 of the supply means 50 is in contact with the application roller 2 in a state of protruding upward, and the treatment liquid 10 can be applied to the surface of the application roller 2 by rotating the application roller 2. . When the paper 13 is supplied, the paper 13 is sandwiched between the coating roller 2 and the opposing roller 51 by further raising the application roller 2 by a necessary amount or lowering the opposing roller 651 at a predetermined timing. The processing liquid 10 can be applied to one side of the paper 13 by being nipped and conveyed.

  FIG. 15 shows the cleaning state. From the application state shown in FIG. 14, the elevating motor 63 is further driven in the upward direction to raise the cartridge holder 60 until the link member 67 is detected by the upper limit sensor S3. At this time, the application roller 2 is in contact with the inclined surface of the cleaning unit 57 of the supply means 50 with a predetermined pressure. Further, the application unit 54 of the supply unit 50 is in a state of being pressed into the storage unit 52 by being pressed by the application roller 2. If the application roller 2 is rotated in this state, the dirt adhering to the peripheral surface of the application roller 2 can be removed by the cleaning unit 57. If the treatment liquid 10 is applied to the application roller 2 in the application state before cleaning, and the cleaning is performed after a predetermined time has elapsed, the treatment liquid 10 adhered to the application roller 2 and solidified is thickened. It becomes soft and easy to remove before cleaning.

  FIG. 16 shows a state where the supply means 50 removed from the cartridge holder 60 is sealed with a cap 72 and stored. The cap 72 placed on the upper surface side of the supply means 50 is a box shape of a size that covers the cleaning portion 57, and a sealing groove portion 73 that isolates and seals only the application portion 54 is provided on the inner and lower surfaces thereof. . According to this cap 72, the cleaning part 57 is prevented from drying, and the application part 54 is double-sealed, so that it is possible to reliably prevent the treatment liquid 10 from being evaporated and dried.

  As described above, according to the present embodiment, the processing liquid 10 is held, the processing liquid 10 is supplied, the supplied processing liquid 10 is applied to the application roller 2, and the application roller 2 is cleaned. Since the functions are concentrated in one cartridge, a simple and inexpensive configuration can be realized, and in particular, it is possible to realize an easy-to-use supply means 50 that facilitates maintenance related to the processing liquid.

  Further, according to the supply means 50 of the processing liquid 10 of the present embodiment, since it has a sealed structure, there is little alteration such as a concentration change of the processing liquid 10. Further, since it is in the form of a sealed cartridge, there is a need to pay attention to the horizontal installation of the apparatus in order to prevent the leakage of the processing liquid 10 and other problems when installing the pretreatment apparatuses 1 and 1 ′ for printing. Few.

DESCRIPTION OF SYMBOLS 1,1 '... Pre-processing apparatus for printing 2 ... Application roller 7 ... Supply means of processing liquid to application roller 10 ... Pre-processing liquid for printing (processing liquid)
DESCRIPTION OF SYMBOLS 15 ... Paper feed means 18 ... Conveyance path 21 ... Paper discharge stand as paper discharge means 25 ... Control means 35 ... Lower side guide plate 40 ... Stacking roller 50 ... Supply means of process liquid to application roller 52 ... Storage section 54 ... Application unit 57 ... Cleaning unit 60 ... Cartridge holder 69 ... Capping unit A ... Application timing sensor B ... Application timing sensor S1 ... Paper sensor S2 ... Rear end sensor S3 ... Upper limit sensor R1 ... First timing roller R2 as a transport roller ... Claim The second timing roller R3 as the first conveying roller in the item 3... The third timing roller R4 as the second conveying roller in the item 4.

Claims (5)

In a printing pretreatment apparatus for applying a printing pretreatment liquid to a sheet-like substrate,
A pair of application rollers arranged at a predetermined interval and rotating with at least one moving to sandwich the substrate to be printed with the other;
Supply means for supplying a pretreatment liquid for printing to at least one of the pair of application rollers;
A sensor for detecting a printing material supplied between the pair of application rollers;
When the sensor detects the printing medium, at least one of the pair of application rollers is moved and rotated in a state where the printing medium is sandwiched between the two, the pretreatment liquid for printing on the printing medium Control means for controlling to apply,
A pre-processing apparatus for printing. 2. The pre-printing apparatus for printing according to claim 1, wherein a width of the pair of application rollers in a rotation axis direction is smaller than a width of the printing medium. A first transport roller and a second transport roller are provided upstream and downstream of the pair of application rollers in the transport direction of the printing medium, respectively.
The conveyance speed of the first conveyance roller is equal to or less than the conveyance speed of the pair of application rollers, the conveyance speed of the second conveyance roller is equal to or greater than the conveyance speed of the pair of application rollers,
3. A pre-printing apparatus for printing according to claim 2, wherein the conveying force of the second conveying roller is smaller than the conveying force of the pair of application rollers. On the upstream side of the first conveyance roller, a pair of conveyance rollers and a pair of overlapping rollers are arranged side by side along the conveyance direction of the printing medium,
The tangential direction at the holding position of the printing medium by the pair of conveying rollers and the tangential direction at the holding position of the printing medium by the pair of overlapping rollers intersect at a predetermined angle,
4. The front end of a subsequent printing medium transported by a pair of transport rollers is overlapped and transported with respect to the rear end of a preceding printing medium sandwiched between the pair of overlapping rollers. The pre-processing apparatus for printing described in 1. A storage unit that stores the pretreatment liquid for printing, a coating unit that applies the pretreatment liquid for printing in contact with the rotating application roller, and a preprocessing for printing that is stored in the storage unit The printing pretreatment device according to claim 4, further comprising: a supply unit that supplies the liquid to the coating unit, and a cleaning unit that performs cleaning by contacting the rotating coating roller.

Images