JPH0721318Y2 - Small offset printing machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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]

2. Description of the Related Art Conventionally, as a printing machine of this type, a paper stock unit for stocking printing paper is provided on the front side of a base, and the printing paper stocked in the paper stock unit is sent to the rear side to convey the paper. A blanket drum having an axis orthogonal to the rotatably mounted on the base is rotated so that the ink transferred onto the blanket covered on the outside of the blanket drum is printed on the paper.
A printing plate is detachably attached to the base, and a plate cylinder that transfers 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 application roller is provided, and an ink supply unit that supplies ink to the ink application roller is further provided.

In this conventional printing machine, when the plate is replaced, the printing plate on the plate cylinder is removed and another new printing plate is mounted. Also,
When performing multicolor printing, for example, when performing two-color printing, first print one color on one printing plate, and then change the plate to print another color on another printing plate. ing.

[0004]

By the way, in the above-mentioned conventional small-sized offset printing machine, when the printing plate is attached and detached, the plate cylinder is fixed to the base, and the surrounding parts are contiguous and crowded. Since it is necessary to remove the cylinder while rotating the plate cylinder in a narrow space, it is difficult to perform the work, and it is difficult to obtain the positional accuracy of the printing plate, which is complicated and the work efficiency is poor.

Particularly, when trying to perform multicolor printing,
There is a problem that the work efficiency is extremely poor because the number of man-hours is large because the plate must be changed one by one, and the plate change is complicated as described above.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a small offset printing machine which can easily carry out plate changing and reduces plate changing at the time of multi-color printing, thereby improving work efficiency. It is in the point of providing.

[0007]

A small offset printing machine according to the present invention for solving the above-mentioned problems stocks a printing base provided with a base having side frames on both sides and a front side of the base. A paper stock unit, a paper transport mechanism that feeds the printing paper stocked in the paper stock unit to the rear side, and a blanket that has an axis orthogonal to the paper transport direction and is rotatably provided on the side frame and covered on the outside. A blanket drum that prints the ink transferred onto the paper, a plate cylinder that is detachably attached to the printing plate and that transfers the ink on the printing plate to the blanket of the blanket drum, and the ink on the printing plate on the plate cylinder. In a small offset printing machine provided with an ink applying roller for applying and an ink supplying section for supplying ink to the ink applying roller, A plate cylinder cassette that is rotatably supported by a holder and is removable from a side frame is configured, and an ink application cassette that is rotatably supported by a roller holder is configured to be removable from a side frame. The ink supply unit is an ink supply cassette that can be attached to and detached from the side frame, and a plurality of sets of these plate cylinder cassettes, ink application cassettes, and ink supply cassettes are provided, and the plate cylinder cassette is attached to the side frame of the base. A plurality of guide portions are provided to guide each set of the ink application cassette and the ink supply cassette in the radial direction of the blanket drum so that they can be inserted and removed.

Further, a support member movably provided on the guide unit for supporting the set of the plate cylinder cassette, the ink application cassette and the ink supply cassette, and a movement for moving the support member in a direction away from the blanket drum. It is effective to have a mechanism.

[0009]

According to this means, first, the set of the plate cylinder cassette, the ink application cassette, and the ink supply cassette is removed from the guide portion, the printing plate is mounted on the plate cylinder of each plate cylinder cassette, and the ink is supplied to the ink supply cassette. Fill the color ink. Next, the plate cylinder cassette, the ink application cassette, and the ink supply cassette are sequentially mounted on the guide portion. In this state, a predetermined amount of paper is stocked in the paper stock section and printing is started. In this printing, the paper is transported one by one by the paper transport mechanism. On the other hand, the ink of 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 a plate change for another printing, 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 printed from the plate cylinder of each plate cylinder cassette. Remove and install a new printing plate. This attachment / detachment is not performed on a device in which parts are densely packed, but can be attached outside the device.
It can be performed in a state where the surrounding space is wide, and the mounting workability is improved accordingly.

Further, in the case where the support for supporting the set of the plate cylinder cassette, the ink application cassette and the ink supply cassette and the moving mechanism of the support are provided, the moving mechanism can be used by the moving mechanism in the case of idling or the like. When the support is moved, the printing plate on the plate cylinder is separated from the blanket of the blanket drum, which prevents unnecessary transfer of ink and prevents the blanket from becoming dirty.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compact offset printing machine according to an embodiment of the present invention will be described below 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, which has 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 paper stock unit 6 is provided on the front side of the base 1 and stocks a small printing paper P such as a business card. Reference numeral 7 denotes a paper transport mechanism that feeds the print paper P stocked in the paper stock unit 6 to the rear side. The paper transport mechanism 7 is provided below the paper stock unit 6, and includes fingers 8 that hook the papers P one by one from the bottom and send them out to the rear side. This finger 8
It is reciprocated by a link mechanism 9 using the motor 4 as a drive source.

Numeral 10 is a blanket drum, and the paper P
Side frame 3 having an axis 11 orthogonal to the transport direction R of
It is rotatably installed. The shaft 11 is the motor 4
It is driven to rotate by a belt transmission mechanism 12 having a drive source. 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 onto the blanket 13 is printed on the fed paper P. Reference numeral 14 is a support roller that presses the paper P against the blanket drum 10. Support roller 1
4 is moved backward by the link mechanism 15 so as not to come into contact with the blanket drum 10 when idling.

T is a transfer mechanism which is composed of a set of the plate cylinder cassette 20, the ink application cassette 30, and the ink supply cassette 40, and transfers the ink to the blanket 13 of the blanket drum 10. In the embodiment, two sets of this transfer mechanism T are provided.

As shown in FIG. 4, the plate cylinder cassette 20 is detachably attached with a sheet-shaped resin printing plate 21 and transfers the ink on the printing plate 21 to the blanket 13 of the blanket drum 10. 22 and the plate cylinder 2 described above
It is composed of a plate cylinder holder 23 that rotatably supports 2 from both sides, and is formed so as to be attachable to and detachable from the side frame 3. Reference numeral 24 is a gear transmission mechanism for rotating the rotary shaft 25 of the plate cylinder 22 in synchronization with the rotation of the blanket drum 10. Further, the printing plate 21 is provided with characters, marks and the like formed in a convex shape.

The ink application cassette 30 includes the plate cylinder 22.
An ink applying roller 31 including a set of large and small rollers that apply ink to the upper printing plate 21, and an ink applying 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 denotes a gear transmission mechanism that rotates the rotary shaft 34 of the ink application roller 31 in synchronization with the rotation of the plate cylinder 22.

The ink supply cassette 40 is provided with an ink storage portion 41 for storing ink and an ink supply roller 42 for drawing out the ink from the ink storage portion 41 and supplying it to the ink application roller 31 in appropriate amounts. It is formed to be removable.

Further, the side frame 3 of the base 1 has 2
Two guides 50 are provided to guide the respective transfer mechanisms T via the support 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 provided on both sides so as to move in the radial direction of the blanket drum 10. It is provided on the frame 3.

The support 60 is a rail 51 of the guide portion 50.
A sliding contact plate 61 that is movably provided between the sliding contact plate 61 and the side frame 62, side plates 62 that are formed to rise on the left and right sides of the sliding contact plate 61 and that slidably contact the rails 51 of the guide portion 50, the plate cylinder cassette 20, and ink application. It is composed of a receiving portion 69 that receives the 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 that projects from the side plate of the support 60 and faces a notch 65 provided in the rail 51. In the range of the notch 65,
The movement range of the support 60 is regulated.

Reference numeral 66 is a stopper for supporting the lower end of the plate cylinder cassette 20. This stopper 66 has a knob 67.
By the adjustment, it is possible to slightly move in the moving direction of the support body 60, and by this movement, the blanket drum 1
It also has a function of adjusting the contact pressure between the blanket 13 of 0 and the printing plate 21 on the plate cylinder 22.

Reference numeral 70 denotes a moving mechanism for moving the support 60 in a direction of separating it from the blanket drum 10. The moving mechanism 70 includes a cam shaft 71 that lifts the lower end 60a of the support body 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 ink when idling is used. It prevents the transcription of.

Therefore, the small offset printing machine according to this embodiment prints as follows. now,
For example, a case of two-color printing in which a black character and a red mark are printed on a business card will be described. A printing plate 21 for characters and a printing plate 21 for marks are prepared in advance.

First, the two transfer mechanisms T consisting of the 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 printing cylinder 21 of the character is attached to the printing cylinder 22 and the printing cylinder 2 of the other printing cylinder cassette 20 is mounted.
The printing plate 21 of the mark is attached to 2. 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 peripheral 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 arranged in the guide portion 5.
It is inserted into the support 60 provided at 0. In this case, it suffices to insert each cassette into the support 60, so that setting can be performed very easily. In this state, 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 camshaft 7 of the moving mechanism 70 is operated by operating the handle.
1 is rotated and the lower end 60a of the support body 60 is lifted.
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
This prevents the situation where the product gets dirty.

When the adjustment is completed, a predetermined amount of paper P is stocked in the paper stock unit 6 and the motor 4 is driven to start printing. In this printing, the fingers 8 reciprocate to feed the sheets P one by one between the blanket 13 and the support roller 14 from the bottom. On the other hand, the gear transmission mechanism 2
The axis of each cassette is rotationally driven by 4, 33,
As a result, first, the ink in the ink supply cassette 40 is pulled out from the ink storage section 41 by the ink supply roller 42 and supplied to the ink application roller 31 of the ink application cassette 30. Next, the ink application cassette 3
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 0. In this case, the black ink is applied to one printing plate 21, and the red ink is applied to the other printing plate 21.

Then, by rotating the plate cylinder 22 of each plate cylinder cassette 20, the blanket 1 of the blanket drum 10 is rotated.
The ink on the printing plate 21 is transferred to 3. In this case, one printing plate 21 transfers black ink, and the other printing plate 21 transfers red ink. afterwards,
By the rotation of the blanket drum 10, the ink transferred onto the blanket 13 is printed on the paper P that is sent. By repeating this process sequentially, two-color printing is performed on a large number of sheets P. In this case, since two-color printing is performed with one setting, it is not necessary to change and print one color at a time, and printing is extremely efficient.

Further, when the plate is changed for another printing, as described above, the 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 used. 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 a device in which parts are densely arranged, but can be attached outside the device, so that it can be performed in a state in which the surrounding space is wide, and the workability of attachment is improved accordingly. For this reason, in printing such as business cards, when various types of printing are performed at one time, such as when printing is frequently changed, the efficiency is extremely improved.

In the above embodiment, the plate cylinder cassette 2
0, ink application cassette 30 and ink supply cassette 4
Two transfer mechanisms T each having a set of 0 are provided, but the number of transfer mechanisms T is not limited to this and needless to say, three or more may be provided.

[0030]

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 printed on the plate cylinder of the plate cylinder cassette. Although the plate is mounted, this printing plate can be mounted outside the device, so that the surrounding space can be wide, and the mounting workability is improved and the positional accuracy of the printing plate is easy to obtain. Therefore, the working efficiency can be greatly improved. In particular, in the case of printing that frequently changes plates, such as when performing multiple types of printing at one time, the cassette is easy to install and remove, and the plates can be replaced with a wide 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 carried out, it is not necessary to change the plates one by one for each color. It becomes possible to perform multicolor printing, and the man-hours are reduced accordingly, and the work efficiency can be improved in this respect as well.

Further, in the case where the support for supporting the set of the plate cylinder cassette, the ink application cassette and the ink supply cassette and the moving mechanism of the support are provided, the moving mechanism can be used by the moving mechanism in the case of idling or the like. When the support is moved, the printing plate on the plate cylinder is separated from the blanket of the blanket drum. Therefore, it is possible to prevent unnecessary transfer of ink and prevent the blanket from being soiled.

[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 perspective view showing a mounted state of a printing plate of a small offset printing machine according to an embodiment of the present invention.

[Explanation of symbols]

 1 base 3 side frame 4 motor 5 cover 6 paper stock P paper 7 paper transport mechanism 10 blanket drum 13 blanket 14 support roller T transfer mechanism 20 plate cylinder cassette 21 printing plate 22 plate cylinder 23 plate cylinder holder 30 ink coating cassette 31 Ink application roller 32 Roller holder 40 Ink supply cassette 50 Guide section 51 Rail 60 Support body 66 Stopper 70 Moving mechanism

Claims (2)

[Scope of utility model registration request] 1. A base having side frames on both sides,
A paper stock unit that is 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 an axis orthogonal to the paper transport direction. A blanket drum that is rotatably provided and prints ink transferred onto a blanket that is coated on the outside, and a plate that detachably attaches a printing plate to transfer the ink on the printing plate to the blanket of the blanket drum. In a small offset printing machine including a cylinder, 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 can be rotated on a plate cylinder holder. Supported on the side frame to form a plate cylinder cassette that can be attached to and detached from the side frame. An ink application cassette that can be held and attached to and detached from the side frame is configured, and the ink supply unit is used as an ink supply cassette that is attachable and detachable to and from the side frame. The plate cylinder cassette, the ink application cassette, and the ink supply cassette are combined. In addition to providing a plurality of sets, the side frame of the base is provided with a plurality of guide portions for guiding each set of the plate cylinder cassette, the ink application cassette, and the ink supply cassette in the radial direction of the blanket drum. A featured small offset printing machine. 2. A support member that is movably provided on the guide unit and supports the set of the plate cylinder cassette, the ink application cassette, and the ink supply cassette, and a movement that moves the support member in a direction away from the blanket drum. The small offset printing machine according to claim 1, further comprising a mechanism.