Abstract:
A dampening water spraying device includes:  
     a nozzle for spraying dampening water;  
     a nozzle holder including, an end surface connectable to the nozzle, and an outer peripheral portion provided with at least one groove; and  
     a nozzle fixing member including, an opening portion adapted to expose at least a spout of the nozzle, and an inner peripheral portion provided with a nozzle attachment/detachment moving portion opposed to and engageable with the groove, the nozzle fixing member being adapted to be fastened to the nozzle holder while clamping the nozzle between the nozzle fixing member and the nozzle holder;  
     wherein the nozzle fixing member includes an outer peripheral portion provided with a handhold portion for making it possible to to manually rotate the nozzle fixing member, thereby allowing to rapidly and readily conduct replacement of the nozzle.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a dampening arrangement in an offset press, and particularly to a dampening water spraying device provided in such an arrangement and including a removable nozzle.  
           [0003]    2. Description of the Prior Art  
           [0004]    Generally, offset presses are provided with dampening arrangement for supplying dampening water prepared with various additives onto printing plate surfaces or onto peripheral surfaces of rollers leading to the printing plates, and particularly, printing machines in off-set newspaper presses (hereinafter simply called “newspaper presses”) are often provided with dampening arrangement. Dampening water spraying devices (hereinafter simply called “spraying devices”) to be used in the dampening arrangement mainly include those of a so-called single fluid type wherein pressurized dampening water is pushed out and sprayed. In such a spraying device, pressurized dampening water is supplied into the spraying device, and the water is alternately stopped and flowed by an operation of an electromagnetic opening/closing valve such that the dampening water is intermittently sprayed from a nozzle attached to a tip end side of the electromagnetic opening/closing valve.  
           [0005]    The prior art concerning a nozzle for spraying dampening water to be utilized in the aforementioned spraying device includes that disclosed in Japanese Patent No. 3035371. As shown in FIG. 1 and FIG. 2, the spraying device described in the Japanese Patent No. 3035371 includes: a nozzle  20   f  having an orifice  23   f ; a nozzle holder  30   f  for supporting the nozzle; a nozzle fixing member  40   f  in a nut shape for fixing the nozzle to the nozzle holder; and an electromagnetic opening/closing valve  13   f  for alternately stopping and flowing dampening water; such that the dampening water is appropriately sprayed by the operation of the electromagnetic opening/closing valve  13   f . The nozzle  20   f  is to be fixed to the nozzle holder  30   f  by the nozzle fixing member  40   f , and the attachment and detachment of the nozzle  20   f  to and from the nozzle holder  30   f  is to be conducted by a tool. Upon attachment of the nozzle  20   f , the nozzle  20   f  is inserted into the nozzle fixing member  40   f , and the nozzle fixing member  40   f  is threaded by a tool onto a male screw  52   f  provided at the tip end portion of the nozzle holder  30   f , while the nozzle fixing member  40   f  is also loosened by the tool such as when the spray of the dampening water becomes defective.  
           [0006]    The spraying device of the prior art disclosed in the Japanese Patent No. 3035371 has such a problem to be solved. Namely, the spraying device of the prior art is intended to spray the dampening water atomized to have a uniform particle diameter from the orifice of the nozzle, by adjusting a supplying pressure of the dampening water so as to improve the printing quality. However, it is extremely difficult to spray the dampening water of a uniform particle diameter from the orifice of the nozzle over a long time, and the orifice is narrowed as the same is used overtime, because the additives contained in the dampening water are deposited and accumulated to a portion around the orifice. It is also inevitable that the orifice is suddenly clogged with foreign matters during long-term usage, thereby changing a spraying state. If this changed state is left alone, the dampening water is not properly sprayed, thereby causing such a serious defect including not only a deteriorated printing quality but also a contaminatedly printed paper face due to lack of the dampening water. As such, it is necessary for a responsible person to replace the nozzle before such a situation, but the working efficiency upon nozzle replacement has been extremely low because attachment and detachment of the nozzle is to be conducted by the tool.  
           [0007]    It is also typical in newspaper presses to provide eight pieces of nozzles per one printing cylinder capable of printing a sheet of paper having a 4-page width. However, recent newspapers have been remarkably developed into an increased number of pages and into colorization, and one example of printing by a set of newspaper presses includes a situation for printing a newspaper having 48 pages inclusive of 24 pages to be printed in 4 colors, thereby requiring 48 pieces of nozzles for monochrome printing of 24 pages and requiring 192 pieces of nozzles for color printing of 24 pages, thereby resulting in 240 pieces of nozzles to be used. Usually, newspaper publishers often possess a plurality of sets of newspaper presses, and such an increased number of nozzles far exceeding the aforementioned 240 pieces are to be subjected to maintenance, such that the nozzle maintenance becomes an extremely heavy burden to a responsible person in a position for managing the printing quality.  
         SUMMARY OF THE INVENTION  
         [0008]    It is therefore an object of the present invention to sweepingly solve the problems accompanying the prior art to thereby facilitate the maintenance of nozzles thereby improving working efficiency, by providing a dampening water spraying device capable of rapidly and readily replacing nozzles, in a manner: to fix a nozzle to a nozzle holder by manually rotating a nozzle fixing member in one direction relative to the nozzle holder; and to detach the nozzle from the nozzle holder by manually rotating the nozzle fixing member in the other direction relative to the nozzle holder.  
           [0009]    To solve the above problem, the present invention provides a dampening water spraying device for a dampening arrangement for spraying dampening water from a nozzle onto a printing plate surface or onto a peripheral surface of a roller leading to the printing plate, characterized in  
           [0010]    that the spraying device comprises:  
           [0011]    a nozzle for spraying dampening water;  
           [0012]    a nozzle holder including, an end surface connectable to the nozzle, and an outer peripheral portion provided with at least one groove; and  
           [0013]    a nozzle fixing member including, an opening portion adapted to expose at least a spout of the nozzle, and an inner peripheral portion provided with a nozzle attachment/detachment moving portion opposed to and engageable with the groove, the nozzle fixing member being adapted to be fastened to the nozzle holder while clamping the nozzle between the nozzle fixing member and the nozzle holder;  
           [0014]    that the nozzle fixing member includes an outer peripheral portion provided with a handhold portion for making it possible to to manually rotate the nozzle fixing member; and  
           [0015]    that the nozzle fixing member is capable of fixing the nozzle to the nozzle holder by manually rotating the nozzle fixing member in one direction relative to the nozzle holder, and is capable of detaching the nozzle from the nozzle holder by manually rotating the nozzle fixing member in the other direction relative to the nozzle holder.  
           [0016]    In claim 2, the present invention further provides a dampening water spraying device for a dampening arrangement for spraying dampening water from a nozzle onto a printing plate surface or onto a peripheral surface of a roller leading to the printing plate, characterized in  
           [0017]    that the spraying device comprises:  
           [0018]    a nozzle for spraying dampening water;  
           [0019]    a nozzle holder including, an end surface connectable to the nozzle, and an outer peripheral portion having at least one nozzle attachment/detachment moving portion; and  
           [0020]    a nozzle fixing member including, an opening portion adapted to expose at least a spout of the nozzle, and an inner peripheral portion provided with a groove opposed to and engageable with the nozzle attachment/detachment moving portion, the nozzle fixing member being adapted to be fastened to the nozzle holder while clamping the nozzle between the nozzle fixing member and the nozzle holder;  
           [0021]    that the nozzle fixing member includes an outer peripheral portion provided with a handhold portion for making it possible to to manually rotate the nozzle fixing member; and  
           [0022]    that the nozzle fixing member is capable of fixing the nozzle to the nozzle holder by manually rotating the nozzle fixing member in one direction relative to the nozzle holder, and is capable of detaching the nozzle from the nozzle holder by manually rotating the nozzle fixing member in the other direction relative to the nozzle holder.  
           [0023]    In the dampening water spraying device recited in claim 1, the nozzle attachment/detachment moving portion of the nozzle fixing member interacts with the groove of the nozzle holder, to thereby fix the nozzle to the nozzle holder. In the dampening water spraying device recited in claim 2, the groove of the nozzle fixing member interacts with the nozzle attachment/detachment moving portion of the nozzle holder, to thereby fix the nozzle to the nozzle holder.  
           [0024]    Both of the dampening water spraying devices recited in claim 1 and claim 2 allow to readily and manually attach/detach the nozzle without using any mounting tools, thereby contributing to mitigating a work burden of a responsible person.  
           [0025]    Further, since the maintenance of nozzles are facilitated by virtue of the mitigated burden of a replacing work, it becomes possible to properly manage and stabilize the spraying state of dampening water, thereby making it possible to to maintain and improve a printing quality.  
           [0026]    Preferably, as recited in claim 3, it is desirable for the dampening water spraying device of claim 1 or 2, that the nozzle attachment/detachment moving portion is a protruded body, and that the groove to be engaged with the nozzle attachment/detachment moving portion is a helical groove shorter than the circumference of a peripheral portion to be provided with the helical groove.  
           [0027]    Since the nozzle attachment/detachment moving portion is to be engaged with the groove by slightly rotating the nozzle attachment/detachment moving portion, the attachment and detachment of the nozzle can be conducted in a one-touch manner.  
           [0028]    Preferably, as recited in claim 4, it is desirable for the dampening water spraying device of claim 1 or 2, that the nozzle attachment/detachment moving portion and the groove to be engaged with the nozzle attachment/detachment moving portion are threaded members, respectively.  
           [0029]    This makes it possible to to similarly fix the nozzle fixing member to the nozzle holder, even when the nozzle attachment/detachment moving portion is not a protruded body but a threaded member.  
           [0030]    More preferably, as recited in claim 5, it is desirable for the dampening water spraying device of anyone of claims 1 through 4, that the opening portion of the nozzle fixing member has a shape formed to enable the nozzle to pass through the opening portion when the opening portion and the nozzle are placed in a predetermined phase relationship.  
           [0031]    Devising the shape of the nozzle fixing member in this way facilitates to detach the nozzle from the nozzle holder.  
           [0032]    Further preferably, as recited in claim 6, it is desirable for the dampening water spraying device of anyone of claims 1 through 5, that the nozzle is incorporated in the nozzle fixing member in a manner to be allowed to move relative to the nozzle fixing member, and to be prevented from separating from the nozzle fixing member.  
           [0033]    Thus, the nozzle is not inadvertently separated from the nozzle fixing member even when the nozzle fixing member is detached from the nozzle holder.  
           [0034]    More preferably, as recited in claim 7, it is desirable for the dampening water spraying device of anyone of claims 1 through 6, that the dampening water spraying device further comprises positioning means capable of fixingly restricting an attached relationship of the nozzle relative to the nozzle holder.  
           [0035]    Restricting the attached relationship of the nozzle relative to the nozzle holder realizes an optimum positioning of the nozzle.  
           [0036]    Further preferably, as recited in claim 8, it is desirable for the dampening water spraying device of anyone of claims 1 through 7, that the outer peripheral portion of the nozzle holder comprises a cylindrical member provided integrally with the nozzle holder.  
           [0037]    Preferably, as recited in claim 9, it is desirable for the dampening water spraying device of anyone of claims 1 through 7, that the inner peripheral portion of the nozzle fixing member comprises a cylindrical member provided integrally with the nozzle fixing member.  
           [0038]    By adopting such a cylindrical member, it becomes possible to mitigate a work burden of a responsible person even in the spraying device of the prior art having a screw portion on a nozzle holder, and to facilitate the maintenance of the nozzle.  
           [0039]    More preferably, as recited in claim 10, it is desirable for the dampening water spraying device of anyone of claims 1 through 9, that the handhold portion comprises at least one projected portion projected from the outer peripheral portion of the nozzle fixing member.  
           [0040]    Since the handhold portion comprises the projected portion, the nozzle can be readily attached and detached without requiring any special tools. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0041]    The foregoing and other features of the present invention will become apparent to those skilled in the art to which the present invention relates from reading the following description with reference to the accompanying drawings, in which:  
         [0042]    [0042]FIG. 1 is a partial perspective view of a spraying device of the prior art;  
         [0043]    [0043]FIG. 2 is a partial cross-sectional view of the spraying device of FIG. 1;  
         [0044]    [0044]FIG. 3 is a partial cross-sectional view of a dampening water spraying device according to a first embodiment of the present invention;  
         [0045]    [0045]FIG. 4 is a partial plan view of FIG. 3 and FIG. 7;  
         [0046]    [0046]FIG. 5 is a partial perspective view of FIG. 3;  
         [0047]    [0047]FIG. 6A is a perspective view of a nozzle viewed from an orifice side;  
         [0048]    [0048]FIG. 6B is a perspective view of a large diameter portion of the nozzle viewed from a bottom surface side;  
         [0049]    [0049]FIG. 6C is a perspective view of a separation preventing member provided at the large diameter portion of the nozzle in FIG. 6A;  
         [0050]    [0050]FIG. 7 is a partial cross-sectional view of a dampening water spraying device according to a second embodiment of the present invention;  
         [0051]    [0051]FIG. 8A is a perspective view of a cylindrical member in FIG. 7;  
         [0052]    [0052]FIG. 8B is a partial cross-sectional view of the cylindrical member of FIG. 8A while showing a vertical groove of the cylindrical member at a right side surface of the latter;  
         [0053]    [0053]FIG. 8C is a partial cross-sectional view of the cylindrical member of FIG. 8A while showing the vertical groove of the cylindrical member at a frond side of the latter;  
         [0054]    [0054]FIG. 9 is a partial cross-sectional view of a dampening water spraying device according to a third embodiment of the present invention;  
         [0055]    [0055]FIG. 10 is a partial plan view of FIG. 9 and FIG. 12;  
         [0056]    [0056]FIG. 11 is a partial plan view showing a relationship between the nozzle provided with a separation preventing member of FIG. 9 and positioning means;  
         [0057]    [0057]FIG. 12 is a partial cross-sectional view of a dampening water spraying device according to a fourth embodiment is a front of a present invention;  
         [0058]    [0058]FIG. 13 is a front view of a printing machine showing a layout view of a spraying bar provided with the dampening water spraying device according to the present invention; and  
         [0059]    [0059]FIG. 14 is a perspective view of the spraying bar in FIG. 13. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0060]    There will be explained hereinafter embodiments according to the present invention, with reference to the drawings.  
         [0061]    The spraying devices according to the present invention are plurally incorporated into a spraying bar  10  of a dampening arrangement provided in a printing machine P (see FIG. 13) of a newspaper press such as an offset press. The spraying bar  10  is provided to oppose to a roller R for supplying dampening water to a plate cylinder C, and the spraying devices  11  are to be mounted on a supporting member  12 , typically at 8 points aligned in an axial direction of the plate cylinder C as shown in FIG. 14.  
         [0062]    There will be explained hereinafter embodiments of the spraying device  11  ( 11   a ,  11   b ,  11   c ) according to the present invention.  
         [0063]    The spraying device  11  as the first embodiment of the present invention is shown in FIG. 3, FIG. 4 and FIG. 5. The spraying device  11   a  as the second embodiment is shown in FIG. 7. Since the sole difference between the first embodiment and second embodiment resides in that the second embodiment has a cylindrical member  51   a  forming an outer peripheral surface of a nozzle holder  30   a , the second embodiment will be explained by simultaneously describing the same in brackets. Note, reference numerals of constituent parts inherent in the second embodiment will be shown in brackets in the following text.  
         [0064]    The spraying device  11  ( 11   a ) is constituted to include: a nozzle  20  for spraying dampening water; a nozzle holder  30  ( 30   a ) integrally attached to one end side of an electromagnetic opening/closing valve  13  and including positioning means  31 ,  31  for the nozzle  20 ; a nozzle fixing member  40  for fixing the nozzle  20  to the nozzle holder  30  ( 30   a ); and nozzle attachment/detachment moving portions  50  protruded from an inner peripheral portion of the nozzle fixing member  40  in a manner to be opposed to and engaged with two sets of helical grooves  52 ,  53 ,  54  and  52 ,  53 ,  54  provided on an outer peripheral portion of the nozzle holder  30  (in case of the second embodiment, of the cylindrical member  51   a ). There will be explained hereinafter the constitutions of the respective portions.  
         [0065]    As shown in FIG. 6A, FIG. 6B, the nozzle  20  includes a small diameter portion  21  and a large diameter portion  22 , and the small diameter portion  21  is provided with an orifice  23  for spraying dampening water. The large diameter portion  22  is provided with cut-out surfaces  24 ,  24  established by partly removing the large diameter portion so as to provide a width larger than the diameter of the small diameter portion  21 , and the large diameter portion  22  includes a lower surface  28  provided with an O-ring  25 . When the nozzle  20  is attached to the nozzle holder  30  ( 30   a ) (see FIG. 3, FIG. 7), the lower surface  28  of the large diameter portion  22  is closely contacted with a connecting portion of an end surface  32  of the nozzle holder  30  by virtue of elastic deformation of the O-ring  25 .  
         [0066]    As shown in FIG. 3 and FIG. 7, the nozzle holder  30  ( 30   a ) includes a neck  33  provided integrally with the electromagnetic opening/closing valve  13 . In the second embodiment, the nozzle holder is fitted with the cylindrical member  51   a  on the outer peripheral portion of the nozzle holder.  
         [0067]    The end surface  32  is provided with the positioning means  31 ,  31  for connecting the nozzle  20  and for determining the phase thereof. The positioning means  31 ,  31  are protrudedly provided on the end surface  32  in a manner to oppose to each other: at a spacing slightly larger than the width dimension between the cut-out surfaces  24 ,  24  provided at the large diameter portion  22  of the nozzle  20  (see FIG. 6A); and at a height not exceeding the thickness of the large diameter portion  22 ; thereby making it possible to to determine the phase of the nozzle  20  by assembling the cut-out surfaces  24 ,  24  of the nozzle  20  into a position between the positioning means  31 ,  31  matchingly thereto, respectively. As shown in FIG. 7, FIG. 8A through FIG. 8C, the cylindrical member  51   a  of the second embodiment includes setscrews  56   a ,  56   a , and the cylindrical member is fitted on the nozzle holder  30   a  and fastened to the neck  33  by the setscrews  56   a ,  56   a  so that the cylindrical member is integrally fixed to the nozzle holder  30   a.    
         [0068]    Provided at the outer peripheral portion of the nozzle holder  30  (in case of the second embodiment, at the outer peripheral portion of the cylindrical member  51   a ) are the grooves  52 ,  53 ,  54  and  52 ,  53 ,  54  (see FIG. 3, FIG. 5, FIG. 7, FIG. 8A through FIG. 8C) to be engaged with the nozzle attachment/detachment moving portions  50 ,  50  to be described later, in a manner to be engaged with and interacted with the nozzle attachment/detachment moving portions  50 , thereby making it possible to to attach and detach the nozzle  20  to and from the nozzle holder  30  ( 30   a ).  
         [0069]    The grooves  52 ,  53 ,  54  and  52 ,  53 ,  54  are substantially symmetrically provided at pertinent depths of the outer peripheral portion of the nozzle holder  30  or cylindrical member  51   a , as two continuous helical grooves each having a length shorter than the circumference of the outer peripheral portion in a manner to obtain a desired travel distance such as when each helical groove is traveled by 90 degrees in a right-hand screw direction. Further, each groove  52  has distal ends provided with the grooves  53 ,  54  having no helical angles over an appropriate range, respectively. Provided at the distal end portions of the grooves  53 ,  54  are recesses  57 ,  57  and  58 ,  58  each dug into an appropriate depth deeper than the grooves  53 ,  54 , such that the associated recess  57  and recess  58  are interconnected by the groove  52  having the grooves  53 ,  54  having no helical angles, respectively. There are further provided axial grooves (hereinafter called “vertical grooves”)  59 ,  59  communicated with the recesses  57 ,  57  acting as the starting points of the right-hand screw direction, respectively, and the end portions of the vertical grooves  59  in the direction separated from the recesses  57  are formed to become continuously deeper. The vertical grooves  59 ,  59  act as guiding paths for the nozzle attachment/detachment moving portions  50 ,  50  upon attaching the nozzle fixing member  40  to the nozzle holder  30  (in the second embodiment, to the cylindrical member  51   a ), respectively.  
         [0070]    The nozzle fixing member  40  includes: an opening portion  41  opened into an elongated hole shape and opposed to the end surface  32 , such that the nozzle  20  can be inserted into the opening portion  41  from the large diameter portion  22 ; and projected portions  43 ,  43  projected from an outer peripheral portion  42  so as to act as handhold portions, respectively. The opening portion  41  is provided at a central position of that portion of the nozzle fixing member  40  which opposes to the end surface  32  of the nozzle holder  30  ( 30   a ) when the nozzle fixing member  40  is attached to the nozzle holder  30  (in the second embodiment, to the cylindrical member  51   a ). The phase relationship among the positioning means  31 ,  31 , the opening portion  41  of nozzle fixing member  40 , the nozzle attachment/detachment moving portions  50 ,  50 , and the grooves  52 ,  53 ,  54  and  52 ,  53 ,  54  is settled such that the major axis of the opening portion  41  becomes perpendicular to the opposing direction between the positioning means  31 ,  31  when the nozzle attachment/detachment moving portions  50 ,  50  are placed in the recesses  57 ,  57 , respectively, and such that the cut-out surfaces  24 ,  24  of the nozzle  20  are inserted between the positioning means  31 ,  31  to thereby determine the phase at issue when the large diameter portion  22  of the nozzle  20  is inserted into the opening portion  41  in the aforementioned perpendicular state. Thus, the phase of the nozzle  20  inserted through the opening portion  41  is determined by the positioning means  31 ,  31  provided at the nozzle holder  30  ( 30   a ). After inserting the nozzle  20  into the opening portion  41 , the nozzle fixing member  40  is to be manually rotated around the nozzle holder  30  (in the second embodiment, around the cylindrical member  51   a  integral with the nozzle holder  30   a ) in a direction where the nozzle attachment/detachment moving portions  50 ,  50  move along the grooves  52 ,  52 , i.e., in the clockwise direction. As a result, the nozzle fixing member  40  is moved in the axial direction of the nozzle holder  30  ( 30   a ), and the edge portions passed through by the minor axis of the opening portion  41  in the elongated hole shape are covered onto the portions of the large diameter portion  22  which are not cut out, so that the large diameter portion  22  is seized by a lower surface  45  of the edge portions passed through by the minor axis to thereby fix the nozzle  20 . To release the nozzle  20 , there is conducted the reverse operation. Further, the nozzle attachment/detachment moving portions  50 ,  50  are movable through the vertical grooves  59 ,  59 , so that the nozzle fixing member  40  is removable relative to the nozzle holder  30  (in the second embodiment, relative to the cylindrical member  51   a  integral with the nozzle holder  30   a ).  
         [0071]    As shown in FIG. 3, the nozzle attachment/detachment moving portions  50 ,  50  are provided to establish protruded bodies at the inner peripheral portion of the nozzle fixing member  40 , at one sides of engagement adjusting members  55 ,  55  insertedly provided in the projected portions  43 ,  43  projected as handhold portions from the outer peripheral portion  42  of the nozzle fixing member  40 . In detail, the nozzle attachment/detachment moving portions  50 ,  50  are spherical bodies to be pushed out by spring-like elastic bodies (not shown) provided inside the engagement adjusting members  55 ,  55  formed as threaded rod bodies, such that portions of the spherical bodies are pushed out from the threaded rod bodies by appropriate forces to thereby contact the nozzle attachment/detachment moving portions  50  with the associated grooves  52  by appropriate forces, respectively. The nozzle attachment/detachment moving portion  50  is pushed back by the bottom surface of the groove  52  when the nozzle attachment/detachment moving portions  50  is midway along the groove  52 , while the nozzle attachment/detachment moving portion  50  falls into the recess  57  and recess  58  provided at the distal end portions of the groove  52  when the nozzle attachment/detachment moving portion  50  is at such distal end portions, respectively, thereby assuredly holding the nozzle attachment/detachment moving portion  50  at such positions, respectively. Note, it is possible to attach the nozzle fixing member  40  to the nozzle holder  30  ( 30   a ) even without providing the vertical grooves  59 ,  59 . In this case, it is possible to constitute such that the nozzle fixing member  40  is fitted onto the nozzle holder  30  (in the second embodiment, onto the cylindrical member  51   a ) and then the engagement adjusting members  55 ,  55  are mounted into the projected portions  43 ,  43  of the nozzle fixing member  40 , respectively, in a manner to be engaged with any of grooves  52 ,  52  or  53 ,  53  or  54 ,  54 .  
         [0072]    The spraying device  11   b  as the third embodiment of the present invention will be now shown in FIG. 9 through FIG. 11. The spraying device  11   b  of the third embodiment is constituted to include: a nozzle  20  for spraying dampening water; a nozzle holder  30   b , which is integrally attached to one end side of the electromagnetic opening/closing valve  13 , which includes positioning means  31   b ,  31   b  for the nozzle  20 , and which includes an outer peripheral portion provided with a male screw  52   b ; a nozzle fixing member  40   b  including an inner peripheral portion provided with a female screw  44   b  for fixing the nozzle  20  to the nozzle holder  30   b ; and a nozzle attachment/detachment moving portion  50   b  including a cylindrical member  51   b  having an inner peripheral portion formed with a female screw to be engaged with the male screw  52   b  of the nozzle holder  30   b . There will be explained hereinafter the constitutions of the respective portions.  
         [0073]    As shown in FIG. 6B, FIG. 6C, the nozzle  20  includes a small diameter portion  21  and a large diameter portion  22 , and the small diameter portion  21  is provided with an orifice  23  for spraying dampening water. The large diameter portion  22  is provided with cut-out surfaces  24 ,  24  established by partly removing the large diameter portion so as to provide a width larger than the diameter of the small diameter portion  21 , and the large diameter portion  22  includes a lower surface  28  provided with an O-ring  25 . When the nozzle  20  is attached to the nozzle holder  30   b  (FIG. 9), the lower surface  28  of the large diameter portion  22  is closely contacted with a connecting portion of an end surface  32   b  of the nozzle holder  30   b  by virtue of elastic deformation of the O-ring  25 . The nozzle  20  is provided with a separation preventing member  26  for allowing movement of the nozzle and for preventing separation of the nozzle from the nozzle fixing member  40   b  when the nozzle  20  is incorporated into the nozzle fixing member  40   b . As shown in FIG. 6C, the separation preventing member  26  is attached to the outer peripheral portion of the large diameter portion  22 , such that cut-outs  27 ,  27  of the separation preventing member  26  are correspondingly matched with the cut-out surfaces  24 ,  24  of the large diameter portion  22  of the nozzle  20 , respectively. As shown in FIG. 11, the separation preventing member  26  is provided with the cut-outs  27 ,  27  (FIG. 6C) such that the separation preventing member  26  never interferes with the positioning means  31   b ,  31   b , when the cut-out surfaces  24 ,  24  of the nozzle  20  are inserted between the positioning means  31   b ,  31   b  provided at the end surface  32   b  to thereby determine the connecting phase of the nozzle  20 . As further shown in FIG. 9, the nozzle  20  is not to be separated from the nozzle fixing member  40   b  in a state where the nozzle  20  is attached into an opening portion  41   b  of the nozzle fixing member  40   b  to be described later, even when the nozzle fixing member  40   b  together with the nozzle  20  is detached from the nozzle holder  30   b.    
         [0074]    As shown in FIG. 9, the nozzle holder  30   b  is provided with a neck  33   b  integrated with the electromagnetic opening/closing valve  13 , and includes the male screw  52   b  and the positioning means  31   b ,  31   b , the latter being provided at the end surface  32   b  so as to determine the connecting phase of the nozzle  20 . Since the positioning means  31   b ,  31   b  are the same as the positioning means  31 ,  31  in the first embodiment, the explanation of the former shall be omitted. The outer peripheral portion of the nozzle holder  30  is formed with the male screw  52   b  to be engaged with the nozzle attachment/detachment moving portion  50   b  to be described later, in a manner to engage and interact with the nozzle attachment/detachment moving portion  50   b  as the female screw formed at the inner peripheral portion of the cylindrical member  51   b  integral with the nozzle fixing member  40   b , thereby allowing to attach and detach the nozzle  20  to and from the nozzle holder  30 .  
         [0075]    The nozzle fixing member  40   b  includes an outer peripheral portion provided with handhold portions for making it possible to to manually rotate the nozzle fixing member  40   b . As shown in FIG. 9, FIG. 10, at the central portion of that portion of the nozzle fixing member  40   b  which opposes to the end surface  32   b  of the nozzle holder  30   b  when the nozzle fixing member  40   b  is attached to the nozzle holder  30   b , the nozzle fixing member  40   b  includes a circular opening portion  41   b  into which the nozzle  20  can be inserted, while the female screw  44   b  provided at the inner peripheral portion of the nozzle fixing member  40   b  is threaded with a male screw  46   b  of the cylindrical member  51   b  to thereby integrally fix the cylindrical member  51   b . Provided between, a lower surface  45   b  of those edge portion of the opening portion  41   b  which contact with the upper surface of the large diameter portion  22  of the nozzle  20 , and an end surface  47   b  of the threadedly inserted cylindrical member  51   b , is an appropriate clearance for allowing to accommodate therein the separation preventing member  26  of the nozzle  20 . The inner peripheral portion of the cylindrical member  51   b  integral with the nozzle fixing member  40   b  is provided with the nozzle attachment/detachment moving portion  50   b  formed with the female screw for obtaining a desired travel distance required to fix the nozzle  20 . The nozzle  20 , which is inserted into the opening portion  41   b  of the nozzle fixing member  40   b  and the phase of which nozzle is determined relative to the nozzle holder  30   b , is fixed to the nozzle holder  30   b  by manually rotating the nozzle fixing member  40   b  clockwise so that the lower surface  45   b  at the edge portion of the opening portion  41   b  seizes the upper surface of the large diameter portion  22  of the nozzle  20 .  
         [0076]    Next, FIG. 10, FIG. 12 show a fourth embodiment of a spraying device according to the present invention. The spraying device  11   c  of the fourth embodiment is constituted to include: a nozzle  20  for spraying dampening water; a nozzle holder  30   c , which is integrally attached to one end side of the electromagnetic opening/closing valve  13 , which includes positioning means  31   c ,  31   c  for the nozzle  20 , and which includes an outer peripheral portion provided with a male screw  52   c ; a nozzle fixing member  40   c  for fixing the nozzle  20  to the nozzle holder  30   c ; and a nozzle attachment/detachment moving portion  50   c  provided at an inner peripheral portion of the nozzle fixing member  40   c  and formed with a female screw to be engaged with the male screw  52   c  of the nozzle holder  30   c . There will be explained hereinafter the constitutions of the respective portions.  
         [0077]    The nozzle  20  is the same as that in the first embodiment shown in FIG. 6A, FIG. 6B, and the explanation of the former shall be omitted.  
         [0078]    As shown in FIG. 12, the nozzle holder  30   c  is provided with a neck  33   c  integrated with the electromagnetic opening/closing valve  13 , and includes an end surface  32   c  provided with positioning means  31   c ,  31   c  for determining the connecting phase of the nozzle  20 . The positioning means  31   c ,  31   c  are the same as the positioning means  31 ,  31  of the first embodiment and second embodiment, so that the explanation of the former shall be omitted. The nozzle holder  30   c  includes an outer peripheral portion provided with the male screw  52   c  to be engaged with the nozzle attachment/detachment moving portion  50   c  to be described later, in a manner to engage and interact with the nozzle attachment/detachment moving portion  50   c  as the female screw formed at the inner peripheral portion of the nozzle fixing member  40   c , thereby making it possible to to attach and detach the nozzle  20  to and from the nozzle holder  30   c.    
         [0079]    The nozzle fixing member  40   c  includes an outer peripheral portion provided with handhold portions for making it possible to to manually rotate the nozzle fixing member  40   c . As shown in FIG. 10, FIG. 12, at the central portion of that portion of the nozzle fixing member  40   c  which opposes to the end surface  32   c  of the nozzle holder  30   c  when the nozzle fixing member  40   c  is attached to the nozzle holder  30   c , the nozzle fixing member  40   c  includes a circular opening portion  41   c  into which the nozzle  20  can be inserted, and the nozzle fixing member  40   c  includes an inner peripheral portion provided with the nozzle attachment/detachment moving portion  50   c  formed with a female screw for allowing to obtain a desired travel distance required to fix the nozzle  20 . The nozzle  20 , which is inserted into the opening portion  41   c  of the nozzle fixing member  40   c  and the phase of which nozzle is determined relative to the nozzle holder  30   c , is fixed to the nozzle holder  30   c  by manually rotating the nozzle fixing member  40   c  clockwise so that the lower surface  45   c  at the edge portion of the opening portion  41   c  seizes the upper surface of the large diameter portion  22  of the nozzle  20 .  
         [0080]    There will be explained hereinafter an operation of the dampening water spraying device according to the present invention, with reference to the drawings. Since the first embodiment according to the present invention is the same as the second embodiment except that the nozzle holder  30  is not mounted with the cylindrical member in the first embodiment, the second embodiment will be explained by simultaneously describing the same in brackets. In the second embodiment as shown in FIG. 7, the cylindrical member  51   a  is to be previously and integrally assembled to the nozzle holder  30   a , by fitting the cylindrical member  51   a  onto the nozzle holder  30   a  and by fastening the cylindrical member  51   a  to the neck  33  by the setscrews  56   a ,  56   a . Now in the first embodiment (second embodiment) as shown in FIG. 3 through FIG. 5 (shown in FIG. 7), in order to attach the nozzle fixing member  40  to the nozzle holder  30  ( 30   a ), the nozzle attachment/detachment moving portions  50 ,  50  protruded from the inner peripheral portion of the nozzle fixing member  40  to thereby form the protruded bodies are pushed into the axial direction matchedly with the vertical grooves  59 ,  59  provided in the axial direction of the nozzle holder  30  (in the second embodiment, of the cylindrical member  51   a  integral with the nozzle holder  30   a ). The entrances of the vertical grooves  59 ,  59  are dug  4  deeply, thereby making it possible to to readily insert the nozzle fixing member  40 . As the nozzle attachment/detachment moving portions  50 ,  50  are pushed in the axial direction, the vertical grooves  59 ,  59  become shallower and finally reach a constant depth. The nozzle attachment/detachment moving portions  50 ,  50  are outwardly pushed back against the elastic bodies of the engagement adjusting members  55 ,  55  constituting the threaded rod bodies provided in the nozzle fixing member  40 , and instantly fall into the recesses  57 ,  57  upon reaching the terminating ends of the vertical grooves  59 ,  59 , respectively. This completes the fitting of the nozzle fixing member  40 , and the positions of the recesses  57 ,  57  define the starting position of the nozzle fixing member  40  for starting the fixing of the nozzle  20 . In this state, the nozzle  20  can be inserted between the positioning means  31 ,  31  projectedly provided at the end surface  32 , by inserting the large diameter portion  22  of the nozzle  20  through the opening portion  41 .  
         [0081]    In attaching the nozzle  20  to the nozzle holder  30  ( 30   a ), the nozzle  20  is inserted through the opening portion  41 , and the phase of the nozzle  20  is determined by assembling the cut-out surfaces  24 ,  24  of the nozzle  20  into a position between the positioning means  31 ,  31  matchingly thereto, respectively. Next, the nozzle fixing member  40  is manually rotated clockwise. This causes the nozzle attachment/detachment moving portions  50 ,  50  to move from the grooves  53 ,  53  without helical angles, through helical grooves  52 ,  52 , to the grooves  54 ,  54  without helical angles, so that the nozzle fixing member  40  moves axially while rotating. Namely, the nozzle attachment/detachment moving portions  50 ,  50  pass along the helical grooves  52 ,  52  and reach terminating ends of the grooves  54 ,  54 , and then fall into the recesses  58 ,  58 , respectively. In the process of the above, the upper surface side of the large diameter portion  22  of the nozzle  20  comes to be urged by the lower surface  45  of the edge portions passed through by the minor axis of the opening portion  41  of the nozzle fixing member  40 , and the nozzle attachment/detachment moving portions  50 ,  50  fall into the recesses  58 ,  58  upon reaching the terminating ends. The positions of the recesses  58 ,  58  define the ending position of the nozzle fixing member  40 , i.e., the attachment completing position of the nozzle  20 . At this time, the nozzle  20  is completely closely contacted with and fixed to the end surface  32  of the nozzle holder  30  ( 30   a ), by virtue of the elastic deformation of the O-ring  25  provided at the lower surface  28  of the large diameter portion  22 . This first embodiment (second embodiment) is provided with the grooves  52 ,  53 ,  54  and  52 ,  53 ,  54  for allowing to obtain a desired travel distance by a turn of 90 degrees around the axis, thereby making it possible to to swiftly fix the nozzle  20  in a so-called one-touch manner.  
         [0082]    In detaching the nozzle  20  from the nozzle holder  30  ( 30   a ), the nozzle fixing member  40  is rotated in the opposite direction, i.e., from the ending position toward the starting position to thereby release the seizure of the large diameter portion  22  of the nozzle  20 , and the nozzle  20  can be then readily detached from the nozzle holder  30  ( 30   a ) by picking up the small diameter portion  21  of the nozzle  20  while placing the nozzle fixing member  40  at the starting position. Further, upon cleaning, the nozzle fixing member  40  is drawn out along the vertical grooves  59 ,  59 , thereby making it possible to to detach the nozzle fixing member  40 .  
         [0083]    Next, in the third embodiment according to the present invention shown in FIG. 9 through FIG. 11, the nozzle  20  provided with the separation preventing member  26  is incorporated into the nozzle fixing member  40   b  such that the movement of the nozzle  20  is allowed but the separation thereof is prevented by virtue of the cylindrical member  51   b , and the nozzle  20  is rotatable relative to the opening portion  41   b . In attaching the nozzle  20  to the nozzle holder  30   b , the inner peripheral portion of the cylindrical member  51   b  integral with the nozzle fixing member  40   b  is threaded onto the nozzle holder  30   b , and then the tip end of the nozzle  20  is lightly pinched and rotated rightwardly or leftwardly to thereby assemble the cut-out surfaces  24 ,  24  of the nozzle  20  into a position between the positioning means  31 ,  31  matchingly thereto, respectively, so that the positioning means  31   b ,  31   b  are inserted into the cut-outs  27  of the separation preventing member  26 , respectively, thereby determining the phase of the nozzle  20 . Next, the nozzle fixing member  40   b  is manually rotated clockwise until the same stops. Thus, the nozzle fixing member  40   b  is moved in the axial direction by the nozzle attachment/detachment moving portion  50   b  engaged with the male screw  52   b  of the nozzle holder  30   b , so that the upper surface side of the large diameter portion  22  of the nozzle  20  comes to be pushed by the lower surface  45   b  of the edge portions of the opening portion  41   b  of the nozzle fixing member  40   b , thereby obtaining a desired travel distance of the nozzle fixing member  40   b  such as by an approximately 1.5 turns, to thereby fix the nozzle  20 . In detaching the nozzle  20 , the nozzle fixing member is rotated in the opposite direction to thereby release the engagement of the nozzle attachment/detachment moving portion  50   b  with the male screw  52   b  of the nozzle holder  30   b , thereby making it possible to to detach the nozzle fixing member  40   b  together with the nozzle  20 .  
         [0084]    In replacing the nozzle  20 , the cylindrical member  51   b  is detached from the nozzle fixing member  40   b  so as to remove the used nozzle and to insert a new nozzle provided with a separation preventing member  26  into the opening portion  41   b , and then the cylindrical member  51   b  is again threaded into the nozzle fixing member  40   b.    
         [0085]    In case of the fourth embodiment according to the present invention as shown in FIG. 10 through FIG. 12, the phase of the nozzle  20  is previously determined by assembling the cut-out surfaces  24 ,  24  of the nozzle  20  into a position between the positioning means  31 ,  31  of the nozzle holder  30   c  matchingly thereto, respectively. Then, the inner peripheral portion of the nozzle fixing member  40   c  is fitted onto the nozzle holder  30   c  such that the nozzle  20  is inserted into the opening portion  41   c . Next, the nozzle fixing member  40   c  is manually rotated clockwise until the same stops. Thus, the nozzle fixing member  40   c  is moved in the axial direction by the nozzle attachment/detachment moving portion  50   c  engaged with the male screw  52   c  of the nozzle holder  30   c , so that the upper surface side of the large diameter portion  22  of the nozzle  20  comes to be pushed by the lower surface  45   c  of the edge portions of the opening portion  41   c  of the nozzle fixing member  40   c , thereby obtaining a desired travel distance of the nozzle fixing member  40   c  such as by an approximately 1.5 turns, to thereby fix the nozzle  20 . In detaching the nozzle  20 , the nozzle fixing member is rotated in the opposite direction to thereby release the engagement of the nozzle attachment/detachment moving portion  50   c  with the male screw  52   c  of the nozzle holder  30   c , thereby making it possible to to detach the nozzle fixing member  40   c  attached with the nozzle  20  from the nozzle holder  30   c . Thereafter, the nozzle  20  left on the nozzle holder  30   c  is removed.  
         [0086]    According to the embodiments of the spraying device of the present invention as described above, it is of course possible to adapt to various spraying devices even including the nozzle holder  52   f  of the prior art such as shown in FIG. 1, FIG. 2, by utilizing the constitution including either of the cylindrical member  51   a  and  51   b  in the second embodiment and third embodiment, respectively, in a manner to form a cylindrical member corresponding to an applicable nozzle holder.  
         [0087]    It is also possible that the outer peripheral portion of the cylindrical member  51   a  shown in the second embodiment and the outer peripheral portion of the nozzle holder  30  shown in the first embodiment are provided with the nozzle attachment/detachment moving portions  50 , respectively, and that the inner peripheral portions of the associated nozzle fixing members  40  are provided with the corresponding grooves, in a manner opposite to: the relationship of the nozzle attachment/detachment moving portions  50  constituting the protruded bodies from the inner peripheral portion of the nozzle fixing member  40 , relative to the grooves  52 ,  53 ,  54  and recesses  57 ,  58  at the outer peripheral portion of the cylindrical member  51   a ; and the relationship of the nozzle attachment/detachment moving portions  50  constituting the protruded bodies from the inner peripheral portion of the nozzle fixing member  40 , relative to the grooves  52 ,  53 ,  54  and the recesses  57 ,  58  at the outer peripheral portion of the nozzle holder  30 .  
         [0088]    According to the present invention as described above, it becomes possible to readily and manually attach and detach the nozzle without using any mounting tools, thereby contributing to mitigating a work burden of a responsible person.  
         [0089]    Further, since the maintenance of nozzles are facilitated by virtue of the mitigated burden of a replacing work, it becomes possible to properly manage and stabilize the spraying state of dampening water, thereby making it possible to to maintain and improve a printing quality.  
         [0090]    According to the inventions recited in claims 8, 9 and 10, it becomes possible to mitigate a work burden of a responsible person even in the spraying device of the prior art having a screw portion on a nozzle holder, and to facilitate the maintenance of the nozzle.