JPH0723547U - Small offset printing machine - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to easily change the printing plate, reduce the printing plate changing when printing in multiple colors, and easily perform the image matching, thereby improving the work efficiency. . [Structure] Plate cylinder cassette 20, ink application cassette 30
And a plurality of transfer mechanisms T each including a set of the ink supply cassette 40, and a plurality of guide portions for guiding the transfer mechanisms T on the side frame 3 of the base 1 so as to be respectively insertable and removable in the radial direction of the blanket drum 10. 50 is provided,
Further, a plate cylinder position adjusting mechanism for making the plate cylinder 22 of the plate cylinder cassette 20 rotatable with respect to the plate cylinder axis and finely rotating the plate cylinder 22 with respect to the plate cylinder axis to adjust the rotation position. Further, a blanket position adjusting mechanism is provided which allows the blanket drum 10 to rotate about the drum shaft and finely rotates the blanket drum 10 about the drum shaft to adjust the rotating position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small offset printing machine, and more particularly to a small offset printing machine that can easily perform multicolor printing on small paper such as business cards and postcards.

[0002]

[Prior art]

 Conventionally, as this type of printing machine, a paper stock section for stocking printing paper is provided on the front side of the base, and the printing paper stocked in this paper stock section is sent out to the rear side, orthogonal to the paper transport direction. A blanket drum having a shaft and rotatably provided on a base is rotated so that the ink transferred onto the blanket covered on the outside of the blanket drum is printed on a paper. A printing plate is detachably attached to the base, and a plate cylinder that transfers the ink on the printing plate to the blanket of the blanket drum is rotatably provided, and ink is applied to the printing plate on the plate cylinder. An ink applying roller is provided, and further, an ink supply unit that supplies ink to the ink applying roller is provided.

In this conventional printing machine, when performing plate replacement, the printing plate on the plate cylinder is removed and another new printing plate is mounted. In case of multi-color printing, for example, when printing two colors, first, one color is printed on one printing plate, and then the plate is changed to another color on another printing plate. I am trying to print.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional small offset printing press described above, the plate cylinder is fixed to the base when the printing plate is attached and detached, and the surrounding parts are adjacent to each other. Since it has to be attached and detached while rotating, the work is difficult and the positional accuracy of the printing plate is difficult to obtain, which is complicated and inefficient. In particular, when multicolor printing is to be performed, the number of man-hours is large because the plate must be changed one by one, and it is difficult to map the first and second colors, which is also very complicated. There was a problem.

Therefore, an object of the present invention is to make it possible to easily perform a plate change, reduce the plate change at the time of multi-color printing, and make it possible to easily perform image matching. The point is to provide a small offset printing machine with improved efficiency.

[0006]

[Means for Solving the Problems]

 In order to solve such a problem, the small offset printing machine of the present invention is provided with a base having side frames on both sides, a paper stock unit provided on the front side of the base for stocking printing paper, and a paper stock. It has a paper transport mechanism that feeds the printing paper stocked in the rear part to the rear side, and a drum shaft that is orthogonal to the paper transport direction. It is rotatably provided on the side frame via the drum shaft and is covered on the outside. A blanket drum that prints the ink transferred onto the blanket onto the paper; a printing plate that is detachably attached to transfer the ink on the printing plate to the blanket of the blanket drum; and a printing plate on the printing plate cylinder. A small offset printing machine equipped with an ink application roller for applying ink to the ink application roller and an ink supply unit for supplying ink to the ink application roller. A plate cylinder cassette that is rotatably supported by a holder via a plate cylinder shaft and is detachable from a side frame is configured, and the ink application roller is rotatably supported by a roller holder and is removable from the side frame. Ink supply cassette is configured to be removable from the side frame, and a plurality of transfer mechanisms including a combination of these plate cylinder cassettes, ink application cassettes, and ink supply cassettes are provided. Provided on the side frame of the base are a plurality of guides for guiding each of the transfer mechanisms in the radial direction of the blanket drum so that the plate cylinder can rotate with respect to the plate cylinder axis. A plate cylinder position adjusting mechanism for finely rotating the plate cylinder with respect to the plate cylinder shaft to adjust the rotating position is provided.

Then, a blanket position adjusting mechanism that adjusts the rotating position by making the blanket drum rotatable with respect to the drum shaft and slightly rotating the blanket drum with respect to the drum shaft, if necessary. It is provided.

[0008]

[Action]

 According to this means, first, each transfer mechanism consisting of a set of a plate cylinder cassette, an ink application cassette, and an ink supply cassette is removed from the guide section, the printing plate is mounted on the plate cylinder of each plate cylinder cassette, and the ink supply cassette Fill ink of the color corresponding to. Next, the plate cylinder cassette, the ink application cassette, and the ink supply cassette are mounted in order on the guide part. In this state, a predetermined amount of paper is stocked in the paper stock section and printing is started. In this printing, the paper transport mechanism feeds the paper one by one. On the other hand, the ink in the ink supply cassette is supplied to the ink application roller of the ink application cassette, and the ink is applied to the printing plate on the plate cylinder of the plate cylinder cassette by the rotation of the ink application roller of the ink application cassette. Next, by rotating the plate cylinder of each plate cylinder cassette, the ink on the printing plate is transferred to the blanket of the blanket drum. After that, the ink transferred onto the blanket is printed on the fed paper by the rotation of the blanket drum.

Further, when performing plate replacement for another printing, each transfer mechanism including a set of a plate cylinder cassette, an ink coating cassette, and an ink supply cassette is removed from the guide unit, and each plate cylinder is removed. Remove the printing plate from the plate cylinder of the cassette and install a new printing plate. Since this attachment / detachment is not performed on a device in which parts are densely arranged, but can be attached outside the device, it can be performed in a state where the surrounding space is wide, and accordingly, the installation workability is improved.

Further, in image matching performed during printing, the plate cylinder position adjusting mechanism finely rotates the plate cylinder with respect to the plate cylinder axis to adjust the rotational position. This facilitates adjustment and ensures that the colors of the multicolored characters and marks are joined together.

Further, when a blanket position adjusting mechanism for adjusting the rotating position by finely rotating the blanket drum with respect to the drum shaft is provided, the position of the image on the blanket with respect to the paper can be easily adjusted.

[0012]

【Example】

 Hereinafter, a small offset printing machine according to an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 3 show a compact offset printing machine according to an embodiment.

In the figure, reference numeral 1 is a base having side frames 3 on both sides of a base plate 2. A motor 4 for driving the device is provided below the base plate 2. Reference numeral 5 is a cover for covering the device. A stacker 6 as a paper stock unit for the paper P is provided on the front side of the base 1 and stocks a small printing paper P such as a business card. As shown in FIGS. 4 and 5, the stacker 6 is formed in the shape of a rectangular tube supported by the support base 1a at the front part of the base 1, and stacking and accommodating the sheets P. An opening 6a through which the paper P is fed is formed on the lower front side of the stacker 6.

Reference numeral 7 denotes a paper transport mechanism that feeds the print paper P stocked in the stacker 6 to the rear side. As shown in FIGS. 4 and 5, the sheet conveying mechanism 7 is provided at the lower part of the stacker 6 and hooks the sheets P one by one from the bottom and sends them out to the rear side. A moving link 101, a slider 103 slidably provided on a guide shaft 102 provided on the support base 1a, and a slider 103 connected to the link 101 and reciprocated by the forward and backward movement of the link 101; And a finger 104 that locks the rear end of the sheet P. Reference numeral 105 is a lever for enabling or disabling the locking of the finger 104. By operating this lever 105, the locking of the fingers 104 is made effective and the paper is fed only during printing.

As shown in FIG. 1 to FIG. 3 and FIG. 6 to FIG. 9, 10 is a blanket drum, which is provided on a drum shaft 11 orthogonal to the conveyance direction R of the paper P. The drum shaft 11 is rotatably provided on the side frame 3 via a ball bearing 11a. The drum shaft 11 is rotationally driven by the belt transmission mechanism 12 using the motor 4 as a drive source. Reference numeral 12a is a pulley of the belt transmission mechanism 12 attached to the drum shaft 11. A sheet-shaped blanket 13 is detachably covered on the outer side of the blanket drum 10. Then, by rotating the blanket drum 10, the ink transferred on the blanket 13 is printed on the paper P sent. Reference numeral 14 is a support roller for pressing the paper P against the blanket drum 10. The support roller 14 is moved backward by the link mechanism 15 so as not to come into contact with the blanket drum 10 when idling. Reference numeral 16 denotes a gear for transmitting rotation to a transfer mechanism T described later, which is fixed to the blanket drum 10.

As shown in FIGS. 6 to 9, the blanket drum 10 and the gear 16 are rotatable with respect to the drum shaft 11. Reference numeral 110 denotes a blanket position adjusting mechanism for finely rotating the blanket drum 10 with respect to the drum shaft 11 to adjust the rotating position. The blanket position adjusting mechanism 110 has a pin 112 projecting parallel to the drum shaft 11 on a fixed body 111 fixed to the drum shaft 11, and a recess 113 containing the projecting pin 112 formed on the blanket drum 10. A pair of set screws 114 (right screws) for pressing the pins 112 from both sides of the drum shaft 11 are screwed into the wall portion forming the recess 113. Then, as the set screen 114 moves back and forth, the pin 112 is pressed, the relative positional relationship between the drum shaft 11 and the blanket drum 10 via the fixed body 111 is adjusted, and the image on the blanket 13 is printed on the paper P. The position is adjusted. That is, as shown in FIG. 9, when the blanket drum 10 moves to the A side, the printing position advances with respect to the paper P, and when it moves to the B side, the printing position lags with respect to the paper P.

Reference numeral 115 is a fixing screw for fixing the blanket drum 10 to the drum shaft 11 at the adjusted rotating position. Further, as shown in FIGS. 6A and 6B, the fixed body 111 is provided with a scale 116 along its circumferential direction, and the blanket drum 10 is provided with a pointer 117 for indicating the scale. The rotation width of the blanket drum 10 can be visually confirmed. Reference numeral 118 is a scale in the left-right direction.

Returning to FIG. 4 and FIG. 5, reference numeral 120 denotes a timing adjusting mechanism which adjusts the locking timing of the finger 104 of the slider 103 with respect to the paper P and finely adjusts the printing position of the image on the blanket 13 with respect to the paper P. is there. The timing adjusting mechanism 120 includes a rotary screw 121 having an axis line in the front-rear direction and rotatably provided on the slider 103, and a rotary screw 121 connected to the link 101 that moves back and forth and screwed into the rotary screw 121 to rotate the rotary screw 121. From the connecting portion 122 that relatively moves in the front-back direction, the spline shaft 124 that is inserted into the spline bearing 123 that is provided on the rotary screw 121, and the knob 125 that is provided at the front portion of the base 1 and that rotates the spline shaft 124. It is configured .

As shown in FIGS. 1 to 3, T is a transfer mechanism configured to transfer ink to the blanket 13 of the blanket drum 10 which is composed of a set of a plate cylinder cassette 20, an ink application cassette 30 and an ink supply cassette 40. Is. In the embodiment, two sets of this transfer mechanism T are provided. The left side in FIG. 2 transfers the first color to form the image of the first color on the blanket 13 and the right side transfers the second color to the blanket 13. It forms the map of the color.

As shown in FIGS. 10 to 13, the plate cylinder cassette 20 is detachably attached with a sheet-shaped resin printing plate 21, and the ink on the printing plate 21 is attached to the blanket 13 of the blanket drum 10. And a plate cylinder holder 23 that rotatably supports the plate cylinder 22 from both sides via a plate cylinder shaft 25. The plate cylinder 22 is detachably attached to the side frame 3. . 26 is a ball bearing that rotatably supports the plate cylinder shaft 25 on the plate cylinder holder 23, and 24 is meshed with the gear 16 of the blanket drum 10 to synchronize the plate cylinder shaft 25 of the plate cylinder 22 with the rotation of the blanket drum 10. This is the gear that rotates. The gear 24 is fixed to the plate cylinder shaft 25. Further, the printing plate 21 is provided with characters, marks and the like formed in a convex shape.

As shown in FIGS. 10 to 13, the plate cylinder 22 is rotatable with respect to the plate cylinder shaft 25. Reference numeral 130 denotes a plate cylinder position adjusting mechanism for finely rotating the plate cylinder 22 with respect to the plate cylinder shaft 25 to adjust the rotational position. In the plate cylinder position adjusting mechanism 130, a pin 131 is projectingly provided on the gear 24 in parallel with the plate cylinder shaft 25, and a recess 132 is formed on the plate cylinder 22 to accommodate the projecting pin 131. The recess 132 is formed. A pair of set screws 133 (right screws) for pressing the pins 131 from both sides of the plate cylinder shaft 25 are screwed into the wall portion. Then, as the set screw 133 moves back and forth, the pin 131 is pressed to adjust the relative positional relationship between the plate cylinder shaft 25 and the plate cylinder 22. Now, with reference to the rear side of the plate cylinder cassette 20 (the plate cylinder cassette 20 on the right side in FIG. 12), the gear 24 meshes with other parts and does not move during this adjustment, so as shown in FIG. When 133 is adjusted, the plate cylinder 22 moves with respect to the plate cylinder axis 25, that is, when the plate cylinder 22 moves to the A side, the image of the second color advances to the first color on the blanket 13, and the B side. When moving to, the mapping of the second color is delayed with respect to the first color.

In FIG. 11, reference numeral 134 denotes a screw mechanism for moving the plate cylinder 22 in the direction of the plate cylinder axis 25. A fixing screw 135 fixes the plate cylinder 22 to the plate cylinder shaft 25 at the adjusted rotation position and the adjusted axial position. Further, similarly to the blanket drum 10, the plate cylinder 22 is provided with a scale 136 along the circumferential direction thereof, and the gear 24 is provided with a pointer 137 for indicating the scale 136. Can be seen.

Returning to FIG. 1 to FIG. 3, the ink application cassette 30 includes an ink application roller 31 including a set of large and small rollers that apply ink to the printing plate 21 on the plate cylinder 22, and an ink application roller 31. And a roller holder 32 that rotatably supports the roller from both sides, and is detachably attached to the side frame 3. Reference numeral 33 is a gear for rotating the rotary shaft 34 of the ink coating roller 31 in synchronization with the rotation of the plate cylinder 22.

The ink supply cassette 40 includes an ink storage portion 41 that stores ink, and an ink supply roller 42 that draws out the ink from the ink storage portion 41 and supplies the ink to the ink application roller 31 in appropriate amounts. It is designed to be removable.

Further, the side frame 3 of the base 1 is provided with two guide portions 50 that guide the two transfer mechanisms T via the support bodies 60 so that they can be inserted and removed. The guide portion 50 guides the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40 from both sides, and a pair of parallel rails 51 are arranged so as to move in the radial direction of the blanket drum 10. , Provided on both side frames 3.

The support body 60 is movably provided between the rails 51 of the guide portion 50, and a slide contact plate 61 that slidably contacts the side frame 3 and rails of the guide portion 50 that are formed to rise to the left and right of the slide contact plate 61. It is composed of a side plate 62 which is in sliding contact with 51, and a receiving portion 69 which receives the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40 in order. The support 60 is constantly urged toward the blanket drum 10 by a spring 63. Reference numeral 64 denotes a protrusion projecting from the side plate of the support body 60 and facing a notch 65 provided in the rail 51, and limits the moving range of the support body 60 in the range of the notch 65.

A stopper 66 is an eccentric cam that supports the lower end of the plate cylinder cassette 20. The stopper 66 can be slightly moved in the moving direction of the support body 60 by adjusting the knob 67, and this movement causes the contact between the blanket 13 of the blanket drum 10 and the printing plate 21 on the plate cylinder 22. It also has the function of adjusting the pressure.

Reference numeral 70 denotes a moving mechanism that moves the support 60 in a direction in which it is separated from the blanket drum 10. The moving mechanism 70 is provided with a cam shaft 71 that lifts the lower end 60a of the support 60 by operating the handle, and by this lifting, the printing plate 21 on the plate cylinder 22 is separated from the blanket 13 of the blanket drum 10 and idles. It prevents the transfer of the ink.

In FIGS. 4 and 5, reference numeral 140 denotes a paper positioning device that positions the left and right positions of the paper P in the stacker 6 and adjusts the left and right printing positions of the image on the blanket 13 with respect to the paper P. The sheet positioning device 140 includes a pair of contact plates 141 that are provided in the stacker 6 so as to face each other so as to be able to move forward and backward, and contact the left and right sides of the sheet P, respectively. A rod 142 is provided on the back surface of one of the contact plates 141, and the rod 142 is slidably inserted in a bearing 143 fixed to the stacker 6. 144 is a fixing screw for fixing the rod 142 to the bearing 143. A screw rod 145 is provided on the back surface of the other contact plate 141, and the screw rod 145 is screwed into a nut 146 that is manually rotated. The nut 146 is rotatably held by a holder 147 fixed to the stacker 6. Reference numeral 148 denotes a positioning bolt that is screwed into the holding body 147 and is fitted into a groove 149 formed on the outer periphery of the nut 146 to rotate the nut 146 at a predetermined position, and 150 is a fixing screw that fixes the nut 146 to the holding body 147. is there.

Further, as shown in FIG. 4, reference numeral 151 denotes a presser plate for pressing the rear end of the paper P, and the rod 152 is provided on the back surface of the presser plate 151 so that the presser plate 151 can be moved according to the size of the paper P. Is provided, and the rod 152 is slidably inserted in a bearing 153 fixed to the stacker 6. A fixing screw 154 fixes the rod 152 to the bearing 153.

Therefore, according to the small offset printing machine of this embodiment, printing is performed as follows. Now, a case of two-color printing in which black characters, two-color characters of black and red, and two-color marks of black and red are printed on a business card will be described. The printing plate 21 for black and the printing plate 21 for red are prepared in advance.

First, the two transfer mechanisms T, which are a set of the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40, are removed from the guide section 50, and as shown in FIG. The black printing plate 21 is mounted on the plate cylinder 22 of No. 1, and the red printing plate 21 is mounted on the plate cylinder 22 of the other plate cylinder cassette 20. Since the printing plate 21 can be mounted on the plate cylinder cassette 20 outside the apparatus, the printing plate 21 can be mounted in a wide space, and the mounting workability is improved accordingly. Further, one ink supply cassette 40 is filled with black ink, and the other ink supply cassette 40 is filled with red ink.

Next, the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40 are sequentially inserted into the support 60 provided on the guide portion 50. In this case, it suffices to insert each cassette into the support 60, so that the setting can be performed very easily. Further, the sheets P are stacked and placed in the stacker 6. At this time, the sheet positioning device 140 loosens the fixing screw 144 to widen one of the contact plates 141, then loosens the fixing screw 150 and rotates the nut 146 to rotate the other contact plate 141 as appropriate. Set to position. In this state, one of the contact plates 141 is brought into contact with the paper P, and both fixing screws 144 and 150 are fixed to position the paper P.

Then, the motor 4 is driven to first perform idle operation, test printing, and the like. In this case, the stopper 66 is moved by adjusting the knob, and the contact pressure between the blanket 13 of the blanket drum 10 and the printing plate 21 on the plate cylinder 22 is adjusted. In idling, the cam shaft 71 of the moving mechanism 70 is rotated by operating the handle to lift the lower end 60a of the support 60. By this lifting, the printing plate 21 on the plate cylinder 22 is separated from the blanket 13 of the blanket drum 10, so that unnecessary transfer of ink is prevented and the blanket 13 is prevented from becoming dirty.

In this test printing, mapping is performed. In this mapping, as shown in FIGS. 10 to 13, the fixing screw 135 of the plate cylinder cassette 20 is loosened, the left and right direction is adjusted by the screw mechanism 134, and the front and rear direction is adjusted by the plate cylinder position adjusting mechanism 130. . For example, in the plate cylinder position adjusting mechanism 130 of one of the plate cylinder cassettes 20, the set screw 133 moves forward and backward to press the pin 131 to adjust the relative positional relationship between the plate cylinder shaft 25 and the plate cylinder 22. To do. Now, description will be made on the rear side of the plate cylinder cassette 20 (the plate cylinder cassette 20 on the right side in FIG. 12). In this adjustment, since the gear 24 is fixed to the plate cylinder shaft 25, as shown in FIG. , When the set screw 133 is adjusted, the plate cylinder 22 moves with respect to the plate cylinder shaft 25, that is, the set screw 133 (a) is loosened, and the set screw 133 (b) is tightened. When the plate cylinder 22 is moved to the A side by rotating it in the A1 direction, the image of the second color advances to the first color on the blanket 13, and conversely, the set screw 133 (a) is tightened and the set screw 133 (b ) Is loosened and each set screw 133 is rotated in the B1 direction to move the plate cylinder 22 to the B side, the mapping of the second color is delayed with respect to the first color. After the adjustment, tighten the fixing screw 135 to fix it.

In this way, the mapping of the first color and the second color can be performed. Therefore, the colors of the two-color characters and marks of black and red are reliably joined together, and the printing accuracy is improved. In this case, without this mechanism, the meshing position of the gear 24 must be changed, or the plate cylinder cassette 20 must be removed to adjust the position of the printing plate 21 relative to the plate cylinder 22 one by one. Although it is extremely complicated, according to the present embodiment, since it is sufficient to adjust the set screw 133 of the plate cylinder position adjusting mechanism 130, the position can be adjusted by a simple operation, and the workability is improved accordingly. .

Next, the print position on the paper P is adjusted. In adjusting the printing position, as shown in FIGS. 6 to 9, the fixing screw 115 of the blanket drum 10 is loosened and the blanket position adjusting mechanism 110 adjusts it. In this case, as shown in FIG. 9, the pins 112 are pressed by the forward / backward movement of the set screw 114, and the relative positional relationship between the drum shaft 11 and the blanket drum 10 via the fixed body 111 is adjusted. The print position of the image on the blanket 13 is adjusted. In this adjustment, the gear 16 meshes with the rest and does not move. Therefore, as shown in FIG. 9, when the set screw 114 is adjusted, the drum shaft 11 moves with respect to the blanket drum 10, that is, the set screw. 114 (a) is loosened, set screws 114 (b) are tightened, each set screw 114 is rotated in the A1 direction, and when the blanket drum 10 moves to the A side, the printing position for the paper P advances, and conversely, When the set screw 114 (a) is tightened, the set screw 114 (b) is loosened, and each set screw 114 is rotated in the B1 direction to move the blanket drum 10 to the B side, the printing position with respect to the paper P is delayed. Therefore, the image on the blanket 13 can be printed on the paper P at the regular position on the paper P. In this case, since it is sufficient to adjust the blanket position adjusting mechanism 110, the position can be adjusted by a simple operation, and the workability is improved accordingly.

The fine adjustment of the print position is performed as follows. First, as shown in FIG. 5, in the fine adjustment in the left-right direction, in the sheet positioning device 140, the fixing screw 144 is loosened in the same manner as described above to open one of the contact plates 141, and then the fixing screw 150 is loosened. The nut 146 is slightly rotated to set the other contact plate 141 to an appropriate position. In this state, one contact plate 141 is brought into contact with the paper P, and both fixing screws 144, 150 are fixed. In this way, the left and right positions of the paper P are finely adjusted.

Next, for fine adjustment in the front-rear direction, as shown in FIG. 4, in the timing adjusting mechanism 120, the knob 125 is rotated, and the rotary screw 121 is rotated by the spline shaft 124 to connect the slider 103. The body 122 is moved back and forth. When the slider 103 is moved toward the blanket drum 10, the locking timing of the paper P is advanced, so the image of the blanket 13 is printed with a delay, and when it is moved away from the blanket drum 10, the paper is moved. Since the locking timing of P is delayed, the image of the blanket 13 is advanced and printed.

When the adjustment is completed, a predetermined amount of paper P is stocked in the stacker 6 and the motor 4 is driven to start printing. In this printing, the fingers 104 reciprocate to feed the sheets P one by one from the bottom between the blanket 13 and the support roller 14. On the other hand, the shafts of the respective cassettes are rotationally driven by the gears 16, 24, 33, which causes the ink of the ink supply cassette 40 to be first drawn from the ink storage section 41 by the ink supply roller 42, It is supplied to the ink application roller 31 of the ink application cassette 30. Next, the ink is applied to the printing plate 21 on the plate cylinder 22 of the plate cylinder cassette 20 by the rotation of the ink application roller 31 of the ink application cassette 30. In this case, black ink is applied to one printing plate 21, and red ink is applied to the other printing plate 21.

Then, by rotating the plate cylinder 22 of each plate cylinder cassette 20, the ink on the printing plate 21 is transferred to the blanket 13 of the blanket drum 10. In this case, one printing plate 21 transfers the black ink, and the other printing plate 21 transfers the red ink. After that, the ink transferred onto the blanket 13 is printed on the fed paper P by the rotation of the blanket drum 10. By repeating this process in sequence, two-color printing is performed on a large number of sheets P. In this case, since two-color printing is performed by one setting, it is not necessary to change the printing plates one by one, and printing is extremely efficient.

Further, when the plate is changed for another printing, as described above, the two transfer mechanisms T including the set of the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40 are The printing plate 21 is removed from the guide unit 50, the printing plate 21 is removed from the plate cylinder 22 of each plate cylinder cassette 20, and a new printing plate 21 is mounted. This attachment / detachment is not performed on the device in which the parts are densely arranged, but can be attached outside the device, so that it can be performed in a state where the surrounding space is wide, and the mounting workability is improved accordingly. In addition, because it is easy to perform image matching and print position adjustment, it is extremely efficient for printing that frequently changes plates, such as when printing multiple types of business cards at one time. .

In the above embodiment, two transfer mechanisms T each including the set of the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40 are provided, but the present invention is not necessarily limited to this. Of course, the above may be provided.

[0044]

[Effect of device]

 As described above, according to the small offset printing machine of the present invention, the set of the plate cylinder cassette, the ink application cassette, and the ink supply cassette is removed from the guide portion, and the printing plate is mounted on the plate cylinder of the plate cylinder cassette. Since this printing plate can be mounted outside the device, the surrounding space can be wide, and the mounting workability is improved and the positioning accuracy of the printing plate can be improved easily. The efficiency can be greatly improved. In particular, in the case of printing that requires frequent printing changes, such as when performing multiple types of printing at one time, the cassette is easy to install and remove, and it is possible to perform printing changes with a large surrounding space. Therefore, the work efficiency is extremely improved.

Further, since a plurality of sets of the plate cylinder cassette, the ink application cassette, and the ink supply cassette are provided, when multicolor printing is to be performed, it is necessary to change the plate once for each color. With this, multicolor printing can be performed, and the man-hours are reduced accordingly, and the work efficiency can be improved in this respect as well.

Further, since the plate cylinder position adjusting mechanism for adjusting the rotational position by finely rotating the plate cylinder with respect to the plate cylinder axis is provided, the plate cylinder cassette can be removed during image alignment during multicolor printing. It is possible to perform image alignment by adjusting the plate cylinder position adjusting mechanism without adjusting the position of the printing plate with respect to the plate cylinder one by one. Therefore, it is possible to adjust the position by a simple operation. Can be improved.

Further, when a blanket position adjusting mechanism for finely rotating the blanket drum with respect to the drum shaft to adjust the rotating position is provided, the plate cylinder cassette is removed to adjust the position of the printing plate with respect to the plate cylinder. It is possible to make the printing position on the paper normal by adjusting the blanket position adjusting mechanism without performing each step. Therefore, it is possible to adjust the position with a simple operation, thus improving workability. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a compact offset printing machine according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a small offset printing press according to an embodiment of the present invention.

FIG. 3 is a front sectional view of a small offset printing press according to an embodiment of the present invention.

FIG. 4 is a side sectional view of a main part of a small offset printing machine according to an embodiment of the present invention.

5 is a view from A in FIG. 4. FIG.

FIG. 6 shows a blanket drum of a small offset printing press according to an embodiment of the present invention, (a) is an overall enlarged sectional view,
(B) is a principal part view of FIG.

FIG. 7 is a view as viewed from C in FIG.

FIG. 8 is a D view in FIG.

FIG. 9 is a view from E in FIG.

FIG. 10 is a perspective view showing a plate cylinder cassette of a small offset printing machine according to an embodiment of the present invention.

FIG. 11 is a side sectional view showing a plate cylinder cassette of a compact offset printing machine according to an embodiment of the present invention.

FIG. 12 is a view from F in FIG. 11.

13 is a view from G in FIG.

[Explanation of symbols]

 1 Base 3 Side Frame 4 Motor 5 Cover 6 Stacker P Paper 7 Paper Transfer Mechanism 10 Blanket Drum 11 Drum Shaft 13 Blanket 14 Support Roller T Transfer Mechanism 20 Plate Cylinder Cassette 21 Printing Plate 22 Plate Cylinder 23 Plate Cylinder Holder 25 Plate Cylinder Axis 30 Ink Application Cassette 31 Ink Application Roller 32 Roller Holder 40 Ink Supply Cassette 50 Guide Section 51 Rail 60 Support 66 Stopper 70 Moving Mechanism 110 Blanket Position Adjusting Mechanism 112 Pin 114 Set Screw 115 Fixing Screw 120 Timing Adjusting Mechanism 130 Plate Cylinder Position Adjusting Mechanism 131 pin 133 set screw 135 fixing screw 140 paper positioning device

Claims (2)

[Scope of utility model registration request] 1. A base having side frames on both sides,
A paper stock unit provided on the front side of the base for stocking printing paper, a paper transport mechanism that sends the printing paper stocked in the paper stock unit to the rear side, and a side frame that has a drum shaft orthogonal to the paper transport direction. A blanket drum that is rotatably provided through the drum shaft and that prints the ink transferred onto a blanket that is covered on the outside, and a printing plate that is detachably attached to the blanket drum. In a small offset printing machine comprising a plate cylinder for transferring the above ink, an ink application roller for applying ink to a printing plate on the plate cylinder, and an ink supply unit for supplying ink to the ink application roller,
The plate cylinder is rotatably supported by the plate cylinder holder via the plate cylinder shaft to form a plate cylinder cassette that is detachable from the side frame, and the ink application roller is rotatably supported by the roller holder to support the side. An ink application cassette that can be attached to and detached from the frame is configured, the ink supply unit is an ink supply cassette that is attachable to and detachable from the side frame, and a transfer mechanism including a set of the plate cylinder cassette, the ink application cassette, and the ink supply cassette is provided. In addition to providing a plurality of sets, a plurality of guide portions are provided on the side frame of the base to guide the transfer mechanisms in the radial direction of the blanket drum, respectively, and further, the plate cylinder is rotated with respect to the plate cylinder axis. A small offset which is movable, and is provided with a plate cylinder position adjusting mechanism for finely rotating the plate cylinder with respect to the plate cylinder axis to adjust the rotational position. Printing machine. 2. A blanket position adjusting mechanism is provided which makes the blanket drum rotatable about a drum shaft and finely rotates the blanket drum about the drum shaft to adjust a rotating position. The small offset printing machine according to claim 1.