HK1028002A1 - An inking arrangement for a printing press - Google Patents

Abstract

An inking arrangement for a printing press comprises an ink fountain member (15) having a fountain-forming face (17) for forming an ink fountain, an ink fountain roller (1) defining an ink channel (9) together with the fountain member (15) and having an outer peripheral surface to be inked through the channel (9), a cleaning blade (12) alternatively shiftable to a cleaning position in which the cleaning blade is pressed against the peripheral surface of the fountain roller (1) or to a stand-by position in which the cleaning blade is away from the fountain roller, and a cleaning tank (12), the ink applied to the peripheral surface of the fountain roller (1) through the channel being scraped off by the cleaning blade in the cleaning position and collected in the cleaning tank (12). A plurality of rollers (2,3) is provided for supplying the ink applied to the peripheral surface of the fountain roller (1) to a printing portion, and a strip of sheet (33) has a lengthwise intermediate portion placed over the fountain member (15) so as to cover the fountain-forming face (17) in intimate contact therewith. <IMAGE>

Description

Ink supply device for printing machine

The present application is a divisional application of an invention patent application of the same applicant in the process of substantial examination, the filing date of which is 7/19 th 1994, application No. 94108019.6, the title of which is also "ink supply apparatus for printing press".

Technical Field

The present invention relates to an ink supply device for a printing press.

Background

In a typical printing press, an ink supply roller is provided in the vicinity of an ink fountain member constituting an ink fountain, and ink flowing from the ink fountain to the outer peripheral surface of the ink supply roller is transferred to an ink distribution roller by an ink transfer roller, and the ink is supplied to a printing surface via a plurality of ink distribution rollers.

The ink fountain member is generally plate-shaped, and ink in the ink fountain flows to the outer circumferential surface of the ink supply roller through an ink passage between the ink fountain member and the ink supply fountain.

In the case of the above-described printing press, the type of ink to be used may need to be changed depending on the print contents, and in this case, a preparatory change operation is performed in which the ink in the ink fountain is changed to the ink required for the next printing when the previous printing is completed. The preparation change operation includes operations of collecting old ink in the ink fountain and cleaning the ink fountain member and the rollers.

In a conventional printing press, the ink transfer roller and the ink distribution roller are automatically cleaned by a so-called roller cleaning method, and the ink supply roller and the ink fountain member are automatically cleaned by a manual operation as described below, which is difficult to automate the cleaning. That is, after the end of the previous printing, the ink supply roller is stopped, and in this state, the old ink remaining in the ink fountain is taken out by hand work, and the ink contact portions on the ink supply roller and the ink fountain member are cleaned by hand. Therefore, the recovery and cleaning operation of the old ink is troublesome, and the ink fountain member and the ink supply roller must be cleaned by hand, and if they are not cleaned, the new ink cannot be loaded into the ink fountain, so that the preparation change operation time is required, and it takes a long time to start the next printing.

In the case of a printer, the size (width) of the ink passage may be changed depending on the contents of printing, and in such a case, the size of the ink passage is conventionally adjusted by changing the position, angle, or the like of the ink fountain member, and such an adjustment method is also troublesome.

In addition, in the printing machine, it is desirable to be able to adjust the width of the ink fountain according to the width of the printing surface, but this is difficult for a general printing machine.

Us patent No.5,184,156 discloses a printer ink supply apparatus in which a rotatable member, the axis of rotation of which is parallel to the rollers, can be positioned at several stations. On the circumferential surface of the rotatable member, a plurality of concave ink fountain forming surfaces are provided, and scrapers are provided in both rotational directions of the ink fountain forming surfaces, each of which is in contact with a corresponding roller. The ink fountain forming surface on the circumferential surface of the rotatable member is concave, the concave ink fountain forming surface is not in contact with the roller, and a doctor blade is in contact with the roller. Therefore, if the waste toner on the toner hopper forming surface is to be removed, the blade is first detached, and then the waste toner on the toner hopper forming surface is removed and the blade is fixed again. Therefore, the operation of removing the waste toner on the toner hopper forming surface is very inconvenient. Because the ink fountain forming surface is concave and not plane, the time for removing the waste ink powder on the ink fountain forming surface is wasted.

Disclosure of Invention

The invention provides an ink supply device for a printing machine, which can simply recover old ink and clean an ink supply roller, thereby shortening the preparation and change time.

It is another object of the present invention to provide an ink supply device for a printing press which does not require a cleaning operation of an ink fountain member in preparation for a change operation and can shorten the time required for the preparation for the change operation.

It is another object of the present invention to provide an ink supply device for a printing press, which can easily adjust the size of an ink passage.

It is also an object of the present invention to provide an ink supply device for a printing press that can easily adjust the width of an ink fountain.

According to an embodiment of the present invention, there is provided an ink supply device of a printing press including: an ink fountain member having at least one ink fountain forming surface forming an ink fountain; an ink supply roller forming an ink passage with the ink fountain member and having an outer peripheral surface receiving ink through the ink passage; a plurality of rollers for supplying the ink flowing to the outer circumferential surface of the ink supply roller to the printing portion; and a cleaning tank disposed below the ink fountain member, a cleaning blade being provided in the cleaning tank, a position of the cleaning blade being switchable at least between a cleaning position where the cleaning blade is pressed against the outer peripheral surface of the ink feed roller and a standby position where the cleaning blade is separated from the ink feed roller, and ink flowing from the ink passage to the outer peripheral surface of the ink feed roller being scraped by the cleaning blade located at the cleaning position and entering the cleaning tank, characterized in that: the ink fountain component is prismatic, rotates by taking a rotating shaft parallel to the ink supply roller as a center, and can be positioned at a plurality of working positions; the ink fountain member has a plurality of ink fountain forming surfaces formed around the ink fountain member along a rotational direction of the ink fountain member, each ink fountain forming surface having an ink passage forming portion at one end thereof, the ink passage forming portion being located close to an outer peripheral surface of the ink supply roller when the ink fountain member is positioned at each working position, and the ink fountain forming surfaces forming an ink fountain.

According to another embodiment of the present invention, the ink fountain member has a substantially quadrangular prism shape, and four ink fountain forming surfaces are formed around the ink fountain member.

According to another embodiment of the present invention, distances from the rotation center axis of the ink fountain member to the ink passage forming portions of the plurality of ink fountain forming surfaces are different from each other.

According to another embodiment of the present invention, the positioning angle in each working position of the ink fountain member can be finely adjusted.

According to another embodiment of the present invention, at least a portion of the ink supply roller and at least a portion of the ink fountain member are made of a magnetic material; a weir plate made of a permanent magnet is provided between the supply roller and the ink fountain member, and the weir plate has a supply roller holding surface which is in close contact with the outer peripheral surface of the supply roller and magnetically holds the outer peripheral surface, and a holding surface of the ink fountain member which is in close contact with the ink fountain forming surface of the ink fountain member and magnetically holds the ink fountain forming surface.

The technical scheme of the invention has many advantages, and the specific analysis is as follows:

when normal printing is performed, the cleaning blade is switched to the standby position and is separated from the ink supply roller. Therefore, the ink flowing from the ink fountain to the outer peripheral surface of the ink supply roller through the ink passage is supplied to the printing surface in the same manner as in the conventional art. When a preparation change operation is performed, the cleaning blade is switched to a cleaning position and pressed against the outer peripheral surface of the ink supply roller, and the ink supply roller is rotated in this state. By the rotation of the ink supply roller, the old ink remaining in the ink fountain flows to the outer peripheral surface of the ink supply roller through the ink passage as in the printing, and the ink is scraped off by the cleaning blade and recovered into the cleaning tank. When the ink remaining in the ink fountain is completely taken out by the fountain roller and washed and recovered in the wash tank by the wash blade, the fountain roller is slightly rotated while maintaining this state, so that the ink remaining on the outer peripheral surface of the fountain roller is almost scraped off by the wash blade. Then, if necessary, the outer peripheral surface of the ink supply roller and the ink-contacting portion of the ink fountain member are cleaned by hand, and new ink is filled into the ink fountain to start the next printing operation. In this way, when the preparation change operation is performed, the ink remaining in the ink fountain is automatically collected into the cleaning tank by the cleaning blade located at the cleaning position, and almost all of the ink on the outer peripheral surface of the ink supply roller is wiped off, and if necessary, the surfaces of the ink supply roller and the ink fountain member are cleaned by hand.

In particular, when the kind of ink needs to be changed due to a change in the print content, the ink fountain forming surface on which the ink fountain is formed can be changed by rotating the ink fountain member to position it at a different working position. Therefore, when the preparation change operation is performed, the ink fountain member is rotated to another operation position before the ink fountain forming surface used for the previous printing is cleaned, and the new ink fountain is filled with the new ink by forming the ink fountain from the new ink fountain forming surface used for the next printing, so that the next printing can be started. The ink fountain forming surface used for the previous printing may be purged during the next printing. Therefore, the time for cleaning the ink fountain forming surface can be saved, and the time for preparing the changing operation can be shortened. When the ink fountain member is substantially quadrangular prism-shaped, the ink fountain member is simple in shape and can easily form a plurality of ink fountain forming surfaces around the ink fountain member. When the distances from the rotation center axis of the ink fountain member to the ink passage forming parts of the plurality of ink fountain forming surfaces are different from each other, the size of the ink passage can be changed by the operation position. When the positioning angle of the ink fountain component in each working position can be adjusted finely, the size of the ink passage in each working position can be adjusted finely by adjusting the positioning angle finely.

In particular, the weir plate can be easily attached and detached, and the position of the weir plate in the length direction of the supply roller can be changed. Thus, by changing the position of the weir plate, the width of the ink fountain can be arbitrarily changed. Since the weir plate is magnetically attracted to the ink feed roller only, the rotation of the ink feed roller is not hindered. Even if the ink fountain member is provided with a plurality of ink fountain forming surfaces, the ink fountain member can be rotated in a state where the weir plate is taken out between the ink feed roller and the ink fountain member.

The longitudinal middle part of the strip-shaped sheet is covered on the ink fountain component and is covered and closely attached on the ink fountain forming surface.

In this specification, the term sheet refers to all thin sheet-like flexible members having a thickness much smaller than the length and width. The thickness of the sheet is not limited, and a thin sheet having a large thickness and a thin film having a small thickness are included therein.

In the case of the above-described structure, when normal printing is performed, the portion of the sheet covering the ink fountain forming surface of the ink fountain member is in close contact with the ink fountain forming surface and cannot move in any direction. The ink fountain forming surface covered with the sheet and the ink supply roller form an ink fountain. Ink is filled in the ink fountain. An ink passage is formed between the front end of the ink fountain forming surface covered with the sheet and the ink supply roller. In this state, once the fountain roller rotates, the ink in the ink fountain flows to the outer peripheral surface of the fountain roller through the ink passage. The ink flowing on the surface of the ink supply roller is supplied to the printing surface in the same manner as in the conventional art. In the preparation change operation, as described above, the ink fountain recovers the remaining old ink, and almost all of the ink on the outer peripheral surface of the ink supply roller is wiped off, so that the surface of the ink supply roller can be wiped off by hand as necessary. On the other hand, the sheet is moved in the longitudinal direction so that the used sheet portion to which the old ink has adhered, which has just been in close contact with the ink fountain forming surface, is moved away from the ink fountain forming surface, and at the same time, the unused new sheet portion is brought into close contact with the ink fountain forming surface. New ink is charged into the ink fountain formed by the unused sheet portion and the ink feed roller, and the next printing is performed in the same manner as described above. Since the ink fountain forming surface of the ink fountain member is covered with the sheet, ink does not adhere thereto, and even when a change is to be made, it is only necessary to remove the used sheet portion from the ink fountain forming surface and to bring the unused sheet portion into close contact with the ink fountain forming surface, without cleaning the ink fountain member. Therefore, the preparation and change operation is simple and the time can be shortened.

In particular, when the preparation change is performed, the unused sheet portion can be closely attached to the ink fountain forming surface by winding a sheet of a predetermined length around the sheet winding portion, pulling out the sheet from the sheet roller mounted on the sheet roller supporting portion, and moving the used sheet portion out of the ink fountain forming surface.

In this case, the sheet roller can be rotatably supported by the support member by merely placing the sheet roller in the sheet roller support member.

The sheet winding portion may be provided with, for example, a cylindrical or columnar sheet winding member for winding the sheet and a rotation driving device for rotating the sheet winding member. In this case, the sheet winding member is detachably attached to the rotary drive device, for example, and a groove into which the leading end portion of the sheet is inserted and fixed is formed in the outer peripheral surface of the sheet winding member and extends at least to one end of the sheet winding member.

With the above configuration, the sheet can be wound around the sheet winding member as long as the sheet winding member is rotated by the rotation driving device. Further, the sheet can be wound around the sheet winding member by inserting the leading end portion of the sheet into the groove of the sheet winding member and rotating the sheet winding member. Further, when the entire sheet is wound around the sheet winding member, the sheet can be simply pulled out and thrown away from the sheet winding member in a direction in which the groove extends toward the end.

In particular, if the ink fountain member is rotated to change the working position, the distance from the rotational center axis of the ink fountain member to the ink passage forming portion can be easily changed, and the size of the ink passage can be changed.

In particular, the weir plate can be easily attached and detached, and the width of the ink fountain can be arbitrarily changed by changing the position of the weir plate in the length direction of the ink supply roller. The weir plate may be removed in advance when the sheet is covered on the duct member or when the sheet is moved. Since the weir plate magnetically holds the ink feed roller alone, the rotation of the ink feed roller is not hindered. In addition, even if a plurality of ink fountain forming surfaces are provided on the ink fountain member, the ink fountain member can be rotated in a state where the weir plate is removed from between the ink supply roller and the ink fountain member.

Drawings

The figures represent embodiments of the invention in which:

FIG. 1 is a side view, partly in section, of an ink supply apparatus of a printing press according to embodiment 1 of the present invention;

FIG. 2 is a partially cut-away side view corresponding to FIG. 1, in a state different from that of FIG. 1;

FIG. 3 is a partially cut-away side view corresponding to FIG. 1, in a state different from that of FIG. 2;

FIG. 4 is a partially cut-away side view corresponding to FIG. 1, in a state different from that of FIG. 3;

FIG. 5 is a body diagram of the main portion of FIG. 1;

FIG. 6 is a side view, partly in section, showing a main portion of an ink supply apparatus of a printing press according to embodiment 2 of the invention;

FIG. 7 is a partial cutaway plan view of FIG. 6;

fig. 8 is a partially sectional side view showing a part of fig. 6 in an enlarged manner;

FIG. 9 is a partially cut-away side view corresponding to FIG. 8, in a state different from that of FIG. 8;

FIG. 10 is a partially cut-away side view corresponding to FIG. 8, in a state different from that of FIG. 9;

fig. 11 is a partial cross-sectional side view of a main portion of an ink supply device of a printing press according to embodiment 3 of the present invention.

Detailed Description

Several embodiments of the present invention are described below with reference to the drawings.

Fig. 1 to 4 show four different states of the main part of the ink supply apparatus of the printing press, respectively. Fig. 5 is an enlarged view of a part of the state of fig. 1. In the description of embodiment 1, the right side in fig. 1 to 4 is taken as the front side, the left side is taken as the rear side, and the left and right sides when viewed from the front to the rear are taken as the left and right sides. That is, the outer side of the paper in fig. 1 to 4 is the left side, and the inner side of the paper is the right side. The direction of rotation is shown in fig. 1-4.

The 1 st ink distribution roller 2 among the plurality of ink distribution rollers is disposed in parallel in the front and lower portion of the horizontally extending left and right ink feed rollers 1, and the ink transfer rollers 3 are disposed in parallel between these rollers 1, 2. The ink supply roller 1 and the ink distribution roller 2 are rotatably supported at both right and left ends thereof on a printing frame 4, and are rotated in the direction of the arrow in the figure at a constant rotation speed in synchronization with each other by an appropriate driving device not shown. At least the outer peripheral portion of the ink supply roller 1 is made of a magnetic material, and the outer peripheral surface thereof is attracted by a permanent magnet. The ink transfer rollers 3 are switchable by suitable switching means (not shown) between a position spaced from the distribution roller 2 to interface with the distribution roller 1 and a position spaced from the distribution roller 1 to interface with the distribution roller 2. The configurations of the ink transfer rollers 3 and the ink distribution rollers 2 are well known, and therefore, the description thereof will be omitted.

The magnetic ink fountain 5 extending horizontally in the left-right direction is disposed behind the ink supply roller 1. The ink fountain member 5 is, for example, a quadrangular prism having a square cross section, and support shafts 6 provided at both ends thereof are rotatably supported by the printer frame 4. For example, the duct member can be rotated by hand in any direction and can be positioned at four working positions spaced 90 ° apart. It is fixed at each working position by a suitable member such as a lock pin not shown. The four side surfaces around the ink fountain member 5 are ink fountain forming surfaces 7a, 7b, 7c, 7d, and the ridge lines at the clockwise ends of the ink fountain forming surfaces 7a to 7d are ink passage forming portions 8a, 8b, 8c, 8d corresponding to the ink fountain forming surfaces 7a to 7 d. The ink fountain forming surfaces are collectively indicated by reference numeral 7, and when distinction is required, the 1 st ink fountain forming surface 7a, the 2 nd ink fountain forming surface 7b, the 3 rd ink fountain forming surface 7c, and the 4 th ink fountain forming surface 7d are indicated in the clockwise direction. The ink passage forming portions are also collectively denoted by reference numeral 8, and are denoted as a 1 st ink passage forming portion 8a, a 2 nd ink passage forming portion 8b, a 3 rd ink passage forming portion 8c, and a 4 th ink passage forming portion 8d in a clockwise direction when distinction is required. The end surfaces of the ink fountain member 5 are marked with numbers 1 to 4 corresponding to the ink passage forming portions 8. When the ink fountain member 5 is positioned at the corresponding working position, each ink fountain forming surface 7 constitutes an ink fountain, and the ink passage forming portion 8 corresponding to the ink fountain forming surface 7 is close to the outer circumferential surface of the ink feed roller 1, forming an ink passage 9 between the ink feed roller 1 and the ink passage forming portion 8. The working position in which the 1 st ink fountain forming surface 7a forms an ink fountain as shown in fig. 1 is referred to as a 1 st working position, and the working position in which the 2 nd ink fountain forming surface 7b forms an ink fountain as shown in fig. 4 is referred to as a 2 nd working position. Similarly, the working position where the ink fountain is formed by the 3 rd ink fountain forming surface 7c is referred to as the 3 rd working position, and the working position where the ink fountain is formed by the 4 th ink fountain forming surface 7d is referred to as the 4 th working position. The size of the ink passage 9 depends on the axial distance between the rotation central axis 1a of the ink feed roller 1 and the rotation central axis 5a of the ink fountain member 5, the diameter of the ink feed roller 1, and the distance from the rotation central axis 5a of the ink fountain member 5 to the ink passage forming portion 8. In this case, the distance from the rotation center axis 5a of the ink fountain member 5 to the ink passage forming portion 8 is changed for at least two ink passage forming portions 8, so that the size of the ink passage 9 can be changed for each operation position.

A pair of right and left weir plates 10 as ink fountain side plates are detachably fixed between the ink supply roller 1 and the ink fountain member 5. The weir plate 10 is made of permanent magnets. The parts of the ink supply roller which are roughly triangular and correspond to two sides of the triangle form a partially cylindrical ink supply roller suction surface 10a and a planar ink fountain member suction surface 10 b. When the duct member 5 is rotated, the weir plate 10 is detached from the supply roller 1 and the duct member 5. During printing, the ink supply roller holding surface 10a is closely attached to the outer peripheral surface of the ink supply roller 1 and magnetically holds the outer peripheral surface, and the ink fountain member holding surface 10b is closely attached to the ink fountain forming surface 7 of the ink fountain member 5, which forms an ink fountain, and magnetically holds the ink fountain forming surface. The weir plates are fixed to the ink supply roller 1 and the ink fountain member 5 in this way, and constitute side plates of the ink fountain. At this time, the weir plate 10 magnetically holds the ink supply roller 1 alone, and therefore does not hinder the rotation of the ink supply roller 1. Further, since the weir plate 10 magnetically holds the ink supply roller 1 and the ink fountain 5, it can be easily attached and detached, and the position thereof in the left-right direction can be changed. In this way, the lateral width of the ink fountain can be changed by changing the position of the weir plate 10 in the lateral direction so as to match the printing width. The weir plate 10 may be integrally formed of, for example, metal magnet, plastic magnet, rubber magnet, or the like. Alternatively, the ink-feed roller holding surface 10a and the ink fountain member holding surface 10b may be formed by fixing a weir plate 10 body made of an appropriate material to an appropriate permanent magnet.

Below the ink fountain member 5, a cleaning tank 11 is disposed. A cleaning blade 12 protruding obliquely upward from the front end of the cleaning tank 11 is fixed to the front portion of the cleaning tank 11. The wiper blade 12 is made of, for example, a steel elastic plate having a thickness of about 0.5 mm. The left-right width of the cleaning tank 11 and the blade 12 is slightly larger than the left-right length of the ink supply roller 1. The cleaning tank 11 is supported movably in the front-rear direction by a suitable driving device, not shown, and is switchable between a cleaning position shown in fig. 2 and a standby position shown in fig. 1. The cleaning position is a position where the cleaning tank 11 moves forward and the blade 12 is pressed against the outer circumferential surface of the ink feed roller 1, and the standby position is a position where the cleaning tank 11 moves backward and the blade 12 is separated from the ink feed roller 1.

In the printing press according to embodiment 1, as shown in fig. 1, the cleaning tank 11 is located at a rear standby position, the ink fountain 5 is fixed at a certain working position, and the weir plate 10 is fixed between the ink supply roller 1 and the ink fountain 5. Ink A is put into an ink fountain formed between the ink fountain member 5, the ink supply roller 1, and the left and right weirs 10. Fig. 1 shows a state in which the ink fountain member 5 is fixed at the 1 st working position.

In the state shown in fig. 1, when the ink supply roller 1 rotates, the ink a in the ink fountain flows to the outer peripheral surface of the ink supply roller 1 through the ink passage 9. During the period in which the ink transfer roller 3 is switched to the position in contact with the ink feed roller 1, the ink flowing to the surface of the ink feed roller 1 moves to the outer circumferential surface of the ink transfer roller 3. During the period in which the ink transfer rollers 3 are switched to the position in contact with the ink distribution roller 2, the ink moved to the surface of the ink transfer roller 3 is moved again onto the ink distribution roller 2 and is further supplied to the printing surface via other ink distribution rollers. Thus, by controlling the contact time of the ink transfer rollers 3 with the ink supply roller 1, the amount of ink supplied to the printing surface can be adjusted.

After the print result at the 1 st job position, a preparation change job for printing at the 2 nd job position is performed, for example, as follows.

After the printing at the 1 st working position is completed, as shown in fig. 2, the cleaning tank 11 is first moved to the forward cleaning position, the ink supply roller 1 is rotated in a state where the blade 12 is pressed against the surface of the ink supply roller 1, and the ink a remaining in the ink fountain flows to the surface of the ink supply roller 1 through the ink passage 9 as in the printing, and the ink is scraped off by the blade 12 and recovered in the cleaning tank 11. When all the ink remaining in the ink fountain is taken out by the fountain roller 1 and recovered in the cleaning tank 11 by the doctor blade 12, the fountain roller is slightly rotated in this state. Thus, almost all of the ink remaining on the surface of the ink supply roller 1 is scraped off by the blade 12. Then, as shown in fig. 3, the cleaning tank 11 is moved to a rear standby position, the rotation of the ink supply roller 1 is stopped, the left and right weirs 10 are removed, and the outer circumferential surface of the ink supply roller 1 is cleaned as necessary. After the ink supply roller 1 is cleaned, as shown in fig. 4, the ink fountain member 5 is rotated 90 ° counterclockwise and fixed at the 2 nd working position, a pair of new weir plates 10 are fixed to the ink fountain, new ink a is filled in the ink fountain, and the next printing operation is started.

The ink transfer rollers 3, the ink distribution rollers 2, and the like are cleaned by the same roller cleaning method as in the conventional art at an appropriate time during the period from the end of the previous printing to the start of the next printing. After the next printing is started, the used ink collected in the cleaning tank 11 is discarded, and the weir plate 10 and the 1 st ink fountain forming surface 7a used for the previous printing are cleaned.

When the printing operation is completed, the ink remaining in the ink fountain is automatically collected into the cleaning tank 11 by the blade 12, and almost all of the ink on the outer circumferential surface of the ink feed roller 1 is scraped off. Therefore, the surface of the ink supply roller 1 and the ink fountain forming surface 7a need only be cleaned by hand when necessary, and therefore, the cleaning operation is simple and the preparation change operation time can be shortened. Further, since the ink fountain member 5 is rotated to the 2 nd working position before the cleaning of the 1 st ink fountain forming surface 7a used for the previous printing, and the next printing is started, the 1 st ink fountain forming surface 7a can be cleaned during the next printing, the time for cleaning the 1 st ink fountain forming surface 7a can be saved, and the time required for preparation change can be shortened.

The configurations of the ink fountain member 5, the cleaning tank 11, the blade 12, and the like are not limited to those described in the above embodiments, and may be appropriately changed. In the above embodiment, the size of the ink channel 9 is changed by the working position by changing the distance from the rotation center axis 5a of the ink fountain member 5 to at least two ink channel forming portions 8. However, when it is not necessary to change the size of the ink passage 9 depending on the working position, the distances from the rotational center axis 5a of the ink fountain member 5 to all the ink passage forming portions 8 may be made equal. When the distances from the central axis of rotation 5a of the ink fountain member 5 to all the ink passage forming portions 8 are made equal, the positioning angle of each working position of the ink fountain member 5 can be finely adjusted by an appropriate mechanism. In this way, by finely adjusting the positioning angle of each working position, the position of the ink passage forming portion 8 can be finely adjusted, and the size of the ink passage 9 can be finely adjusted. In addition, in the above embodiment, the distance from the rotation center axis 5a of the ink fountain member 5 to the at least two ink passage forming portions 8 is changed, and the positioning angle of each working position of the ink fountain member 5 may be finely adjusted. For example, the ink fountain member 5 may also be automatically rotated by a suitable drive device. The ink fountain member may be, for example, a triangular column having a regular triangular cross section, and three ink fountain forming surfaces may be formed around the ink fountain member so as to be fixed to three working positions spaced apart by 120 °. The ink fountain member may be plate-shaped, and two ink fountain forming surfaces may be formed on both surfaces thereof so as to be fixed to two working surfaces spaced apart by 180 °. In the above embodiment, the cleaning tank 11 is integrally moved back and forth to switch the position of the blade 12, and only a portion including the blade may be moved to switch the position of the blade.

Fig. 6-10 illustrate embodiment 2. The same portions of embodiment 2 as those of embodiment 1 are denoted by the same reference numerals.

Fig. 6 and 7 show a main part of the ink supply device of the printing press, and fig. 8 to 10 are partially enlarged to show three different states thereof. In the description of embodiment 2, the right and left sides in fig. 6 and 7 are the front and rear sides, and the left and right sides when viewed from the front to the rear are the left and right sides. That is, the outer side of the paper of fig. 6 (lower side of fig. 7) is the left, and the inner side of the paper of fig. 6 (upper side of fig. 7) is the right. The direction of rotation is shown in figure 6.

In embodiment 2, the magnetic ink fountain member 15 extending horizontally in the left-right direction is disposed behind the upper half of the ink supply roller 1. The ink fountain member 15 is, for example, triangular columnar, and support shafts 16 provided at both left and right ends thereof are fixed to the printer frame 4. The front upper inclined surface of the ink fountain member 15 is an ink fountain forming surface 17. The ridge at the front end (lower end) of the ink fountain forming surface 17 is an ink passage forming portion 18. The ink fountain forming surface 17 and the ink supply roller 1 constitute an ink fountain. The ink passage forming portion 18 is close to the outer circumferential surface of the ink feed roller 1, and an ink passage 9 is formed between the ink feed roller 1 and the ink passage forming portion 18. It is preferable that the ink fountain member 15 is rotated about the support shaft 16, and the size of the ink passage 9 can be finely adjusted by finely adjusting the angle. An upward surface having a small width in the front-rear direction is formed between the upper end of the ink fountain forming surface 7 and the upper end of a rear surface, i.e., the upper end of the ink fountain member 15, and a groove 20 having a semicircular cross section and extending in the left-right direction is formed over the entire width of the surface in the left-right direction.

Behind the ink fountain member 15, a sheet roller support portion 21 is provided. A sheet winding portion 22 is provided below approximately the rear half of the ink fountain member 15.

The sheet roller supporting portion 21 is provided with a sheet roller supporting member 23. The support member 23 has a gutter shape extending horizontally in the right-left direction, and both right and left end portions thereof are fixed to the printer frame 4.

The sheet winding portion 22 is provided with a sheet winding member 24 and a rotation driving device 25 thereof. The rotary drive device 25 is provided with an electric motor 26 and a support rotary shaft 27, and the electric motors 26 are mounted on the left and right printer frames 4 so as to face each other. The motor 26 is attached to the inner surface of the left side frame 4 so as to face right, and a tapered receiving member 28 is fixed to the right end of a motor shaft 26a extending horizontally to the right. A support cylinder 29 extending horizontally in the left-right direction is fixed to the inner surface of the right frame 4, and the rotary shaft 27 extending horizontally in the left direction is rotatably and axially movably supported by the support cylinder 29. The rotary shaft 27 is concentric with the motor shaft 26a, and a tapered receiving member 30 is fixed to the left end of the rotary shaft 27. The rotary shaft 27 and the receiving member 30 are biased leftward by an elastic member (not shown) such as a spring provided in the support cylinder 29. The winding member 24 is formed in a cylindrical shape with a thick wall from a metal such as aluminum or a plastic. The winding member 24 is attached between the left and right receiving members 28, 30 and extends horizontally in the left-right direction. At this time, the tip ends of the receiving members 28 and 30 are slightly pushed inside the both end portions of the winding member 24, and are pressed against the peripheral edges of the both end holes of the winding member 24 by the elastic force. In this state, the winding member 24 is rotated counterclockwise by driving the motor 26. Further, the winding member 24 can be easily attached and detached by moving the rotation shaft 27 and the receiving member 30 left and right. Grooves 31 are formed over the entire width of the outer peripheral surface of the winding member 24, and the grooves 31 extend in the left-right direction to both ends of the winding member 24. The groove 31 is inclined from the outer peripheral surface of the winding member 24 toward the inner peripheral surface side, i.e., in the counter-clockwise direction, which is the direction opposite to the rotation direction.

The sheet roll 34 is formed by winding a sheet 33 made of plastic or the like around a core 32 made of paper or the like. The sheet roll 34 is freely rotatably placed in the support member 23. The sheet 33 drawn from the sheet roller 34 in the support member 23 is covered on the ink fountain member 15, covers the ink fountain forming surface 17, and is guided to the winding portion 22. The leading end of the sheet 33 is inserted into the groove 31 of the winding member 24 and fixed. A tension member 35 made of a round bar such as a metal is placed on the groove 20 of the ink fountain member 15, and the sheet 33 passes between the member 35 and the wall surface of the groove 20. By rotating the winding member 24 in the direction indicated by the arrow in the figure, the sheet 33 is wound around the winding member 24, the sheet roller 33 rotates in the support member 23, and a new sheet 33 is drawn out. At this time, since a part of the sheet 33 is sandwiched between the wall surface of the groove 20 of the ink fountain member 15 and the tension member 35, a certain tension is applied to the sheet 33 between the part and the winding member 24, and the part of the sheet 33 covering the ink fountain forming surface 17 can be closely attached to the ink fountain forming surface 17. In practice, an ink fountain is formed between the portion of the sheet 33 covering the ink fountain forming surface 17 and the ink supply roller 1, and the ink passage 9 is formed between the portion of the sheet 33 in close contact with the ink passage forming portion 18 and the ink supply roller 1.

The weir plate 10 is the same as in embodiment 1. When the sheet 33 is covered on the ink fountain member or when the sheet 33 is moved, the weir plate 10 is removed from the ink supply roller 1 and the ink fountain member 15. At the time of printing, the ink supply roller holding surface 10a of the weir plate is closely contacted with and held by the outer peripheral surface of the ink supply roller 1, and the ink fountain member holding surface 10b of the weir plate is closely contacted with and held by the ink fountain forming surface 17 of the ink fountain member 15 via the sheet 33, so that the weir plate is fixed to the ink supply roller 1 and the ink fountain member 15, and the side plate of the ink fountain is constituted.

In the printing press according to embodiment 2, as shown in fig. 8, the cleaning tank 11 is located at the rear standby position, and the weir plate 10 is fixed between the ink supply roller 1 and the ink fountain member 15. The winding member 24 is stopped, and the portion of the sheet 33 that is in close contact with the ink fountain forming surface 17 does not move in any direction. Then, the ink a is charged into the ink fountain between the ink feed roller 1 and the left and right weirs 10, in the portion of the sheet 33 covering the ink fountain forming surface 17 of the ink fountain member 15. At this time, since the ink fountain forming surface 17 is covered with the sheet 33, it does not contact the ink a, and the operation at the time of printing is the same as that of embodiment 1.

After the printing is completed, the preparation change operation for the next printing is performed, for example, as follows.

After the previous printing is finished, first, as shown in fig. 9, the cleaning tank 11 is moved to the front cleaning position, and the ink supply roller 1 is rotated. In this way, similarly to example 1, the ink a remaining in the ink fountain is collected into the cleaning tank 11, and the ink remaining on the surface of the ink feed roller 1 is scraped off. Then, the cleaning tank 11 is moved to a rear standby position, the rotation of the ink feed roller 1 is stopped, the left and right weirs 10 are removed, and the outer circumferential surface of the ink feed roller 1 is cleaned as necessary. On the other hand, as shown in fig. 10, the winding member 24 is rotated and the sheet 33 is moved in the longitudinal direction while being wound around the winding member 24, so that the portion of the used sheet 33 that is stuck to the ink fountain forming surface 17 and is saturated with the old ink is moved out of the ink fountain forming surface 17 and moved toward the winding member 24. Thus, the unused new sheet 33 is drawn out from the sheet roller 34, and a part of the unused sheet 33 is covered on and closely attached to the ink fountain forming surface 17. When the used sheet 33 is partially moved out of the ink fountain forming surface 17 and the unused sheet 33 is partially closely attached to the ink fountain forming surface 17, the rotation of the winding member 24 is stopped, a pair of new weir plates are fixed to the ink fountain, new ink is filled in the ink fountain, and the next printing is performed in the same manner as described above.

In this case, the ink transfer rollers 3, the ink distribution rollers 2, and the like are cleaned by the same roller cleaning method as in the conventional method after the end of the previous printing and before the start of the next printing. After the next printing is started, the used ink collected in the cleaning tank 11 is discarded, and the weir plate 10 used in the previous printing is cleaned.

After printing is performed several times, the sheet 33 is entirely pulled out from the sheet roll 34, and then the winding member 24 is rotated to wind the sheet 33 entirely. Then, the winding member 24 is removed from between the left and right receiving members 28, 30, the sheet 33 is pulled in the longitudinal direction of the winding member 24, the rolled sheet 33 is pulled out from the winding member 24, and only the sheet 33 is pulled out. Since the groove 31 into which the leading end of the sheet 33 is inserted extends up to both ends of the winding member 24, the sheet 33 can be easily pulled out regardless of the direction from which it is pulled. The winding member 24 from which the sheet 33 is pulled out is again mounted between the left and right receiving members 28 and 30, and a new sheet roll is used to perform the next printing in the same manner as described above.

In the case of the printing press according to embodiment 2, similarly to the case of embodiment 1, after printing is completed, the ink remaining in the ink fountain is automatically collected into the cleaning tank 11 by the doctor blade 12, and the ink on the outer peripheral surface of the ink supply roller 1 is scraped off. Therefore, the surface of the ink feed roller 1 can be cleaned by hand when necessary, and the cleaning operation is simple and the preparation change time is shortened. The ink fountain forming surface 17 of the ink fountain member 15 is covered with the sheet 33, so that ink is not applied, and even when a preparation change is made, a part of the used sheet 33 is moved out of the ink fountain forming surface 17, and a part of the unused sheet 33 is brought into close contact with the ink fountain forming surface 17, so that the ink fountain member 15 does not have to be cleaned. Therefore, the preparation change time can be further shortened.

The structure for applying tension to the sheet roller supporting portion 21, the winding portion 22, and the sheet 33 to bring the sheet 33 into close contact with the ink fountain forming surface 17 is not limited to the structure in the above embodiment, and may be appropriately changed. For example, a rotary shaft similar to the rotary shaft 27 of the winding section 22 may be provided on both the left and right sides of the sheet roll supporting section, and the core 32 of the sheet roll 34 may be detachably supported therebetween by an elastic force. In this case, if a suitable resistance is given to the rotation shaft, the sheet 33 can be given a tension so as to be closely attached to the ink fountain forming surface 17. Alternatively, instead of providing the sheet roller support portion, only a sheet roller having a core cylinder, or a sheet roller having no core cylinder or a non-rolled sheet may be placed at an appropriate position in the printing press. In the above embodiment, the rotation driving means rotates the winding member 24 by the motor 26, and the rotation driving means may rotate the winding member manually. Further, the winding member may be made of paper or the like, or the winding member may be thrown away together with the sheet wound thereon. Alternatively, the winding member may be formed in a square shape, and the sheet wound thereon may be pulled out from the free end side thereof. Alternatively, the used sheet portion may be put into a waste bin disposed below without providing a winding portion.

Fig. 11 shows embodiment 3. The same portions of embodiment 3 as those of embodiment 1 and embodiment 2 are denoted by the same reference numerals.

In embodiment 3, only the ink fountain member 5 is different from embodiment 2, and the others are the same as embodiment 2. The ink fountain member 5 is substantially the same as that of embodiment 1. In embodiment 3, the distances from the rotation center axis 5a of the ink fountain member 5 to the four ink passage forming portions 8 are varied. Therefore, the size of the ink passage 9 varies in all the working positions. In this case, it is also preferable that the size of the ink passage 9 can be finely adjusted by finely adjusting the rotation angle of the ink fountain member 5.

The sheet 33 is covered on the ink fountain member 5, and covers and closely contacts at least the ink fountain forming surface 7 constituting the ink fountain. In addition, a mechanism (not shown in fig. 11) is provided for applying appropriate tension to the sheet 33 between the sheet roller 34 and the winding member 24 so as to be closely attached to the ink fountain forming surface 7. Also in this case, an ink fountain is formed between the portion of the sheet 33 covering the ink fountain forming surface 7 and the ink feed roller 1, and the ink passage 9 is formed between the portion of the sheet 33 closely contacting the ink passage forming portion 8 and the ink feed roller 1.

When the ink fountain 5 is rotated, the weir plate 10 is detached from the ink supply roller 1 and the ink fountain 5. In printing, the ink fountain forming surface 7 of the ink fountain member 5 is magnetically attracted from the outer peripheral surface of the ink supply roller 1 and the upper surface of the sheet 33 and fixed to the ink supply roller 1 and the ink fountain member 5, as in embodiment 2.

In printing, the ink fountain member 5 is fixed at a certain working position, and printing is performed in the same manner as in embodiment 2.

When the size of the ink passage 9 does not need to be changed between the first printing and the next printing, the ink fountain member may be fixed to the operation position as it is after the first printing is completed, and the preparation change operation may be performed in the same manner as in embodiment 2.

When the size of the ink passage 9 needs to be changed between the first printing and the next printing, the ink fountain member 5 may be rotated to change the working position while the preparation change operation similar to that of embodiment 2 is performed.

In embodiment 3, the size of the ink passage 9 can be easily changed by rotating the ink fountain member 5 to change the working position.

Even in the case where the ink fountain member has a plurality of ink fountain forming surfaces, the configuration is not limited to that of embodiment 3, and may be changed as appropriate.

In the above three embodiments, the ink fountain members 5 and 15 have a substantially rectangular columnar body, and the support shafts 6 and 16 are integrally formed at both ends of the body. The shape is simple, the manufacture is easy, the precision is easy to improve, and the manufacturing cost is low. However, the structure of the ink fountain members 5 and 15 is not limited to the structure described in the above embodiment, and for example, a conventional ink fountain member may be used.

Claims (5)

1. An ink supply device of a printing press, comprising:

an ink fountain member having at least one ink fountain forming surface forming an ink fountain;

an ink supply roller forming an ink passage with the ink fountain member and having an outer peripheral surface receiving ink through the ink passage;

a plurality of rollers for supplying the ink flowing to the outer circumferential surface of the ink supply roller to the printing portion; and

a cleaning tank disposed below the ink fountain member, a cleaning blade disposed in the cleaning tank, the cleaning blade being switchable between at least a cleaning position where the cleaning blade is in pressure contact with the outer peripheral surface of the ink feed roller and a standby position where the cleaning blade is separated from the ink feed roller, ink flowing from the ink passage to the outer peripheral surface of the ink feed roller being scraped by the cleaning blade at the cleaning position and entering the cleaning tank,

the method is characterized in that:

the ink fountain component is prismatic, rotates by taking a rotating shaft parallel to the ink supply roller as a center, and can be positioned at a plurality of working positions; the ink fountain member has a plurality of ink fountain forming surfaces formed around the ink fountain member along a rotational direction of the ink fountain member, each ink fountain forming surface having an ink passage forming portion at one end thereof, the ink passage forming portion being located close to an outer peripheral surface of the ink supply roller when the ink fountain member is positioned at each working position, and the ink fountain forming surfaces forming an ink fountain.

2. The ink supply apparatus of a printing press according to claim 1, wherein: the ink fountain member is substantially in the shape of a quadrangular prism, and four ink fountain forming surfaces are formed around the ink fountain member.

3. The ink supply apparatus of a printing press according to claim 1, wherein: the distances from the rotation center axis of the ink fountain member to the ink passage forming parts of the plurality of ink fountain forming surfaces are different from each other.

4. The ink supply apparatus of a printing press according to claim 1, wherein: the positioning angle in each working position of the ink fountain member can be finely adjusted.

5. The ink supply apparatus of a printing press according to claim 1, wherein: at least a portion of the ink supply roller and at least a portion of the ink fountain member are made of a magnetic material; a weir plate made of a permanent magnet is provided between the supply roller and the ink fountain member, and the weir plate has a supply roller holding surface which is in close contact with the outer peripheral surface of the supply roller and magnetically holds the outer peripheral surface, and a holding surface of the ink fountain member which is in close contact with the ink fountain forming surface of the ink fountain member and magnetically holds the ink fountain forming surface.