JPH10278230A - Ink fountain device of printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink fountain device capable of rapidly and easily removing the residual ink in an ink fountain. SOLUTION: A long protecting film 15 having a constant width part 15a equal to the width of the bottom surface of an ink fountain and the flap parts 15b provided on both sides of the part 15a is drawn out of a supply roll 16 and wound around a taking-up roll 19 through the ink fountain and the bottom surface 7a and side surface 10a or the ink fountain are covered with the protecting film 15. At a time of the replacement of ink, an ink fountain main body 7 and an ink fountain side plate 10 are retracted to a lower retracted position and the protecting film 15 is taken up to move a part to which the residual ink is bonded to the outside of the ink fountain and a new part is positioned within the ink fountain and, thereafter, the ink fountain main body 7 and the ink fountain side plate 10 are raised to the original operation position to bent the flap parts upwardly by the ink fountain side plate to bond them to the inner surface of the ink fountain side plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink fountain device used for an offset printing machine, a letterpress printing machine, and the like, and more particularly to an ink fountain device capable of easily removing and cleaning ink inside the ink fountain.

[0002]

2. Description of the Related Art In an offset printing machine or a letterpress printing machine, the amount of ink to be supplied must be changed in accordance with a picture at the time of printing. Usually, an ink supply zone is divided into a plurality of sections in the width direction of the picture ( The ink is supplied to a zone having a large area ratio and a small amount to a zone having a small area ratio. Generally, an ink fountain system is used for an inking device in an offset printing machine or a letterpress printing machine.In order to adjust the amount of supplied ink, a large number of ink keys arranged side by side in the width direction are slid and the key tip and the original roller are moved. Is performed by changing the gap. This method has an advantage that the amount of supplied ink can be accurately controlled.

By the way, in the inking unit, cleaning is necessary at the time of item change (color change), and naturally the inner surface of the ink fountain is also cleaned. The cleaning of the inner surface of the ink fountain is difficult to automate, and is usually performed manually by an operator.

[0004]

However, cleaning the inner surface of the ink fountain is troublesome, which is a hindrance in improving the productivity. Further, if the cleaning is insufficient, the ink may enter the gap between the keys and dry, resulting in malfunction of the keys. To solve these problems, a method has been proposed in which a film is attached to an ink fountain and a key, and the film is replaced at the time of cleaning to simplify the cleaning. The method of applying a film is to apply a cut sheet-like film,
There are those that apply a continuous film and wind up a used film. However, in either method, a film is applied only to the flat bottom surface of the ink fountain, and the inner surfaces (side surfaces) on both sides of the ink fountain are exposed or covered with small pieces of a special shape. For this reason, this method requires the work of cleaning the side surface of the ink fountain or the work of replacing small pieces for the cover, and also requires considerable manual work by the operator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a printing machine such as an offset printing machine or a letterpress printing machine, it is easy to remove residual ink on the inner surface of an ink fountain when changing items. It is an object of the present invention to provide an ink fountain device of a printing press which can be cleaned.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a base roller and a base roller disposed close to the base roller.
An ink fountain main body forming an ink fountain bottom surface, an ink key provided at a lower end of the ink fountain bottom surface and capable of adjusting a gap between the ink fountain body, and fixedly provided at both ends of the ink fountain main body. In an ink fountain device provided with an ink fountain side plate forming an ink fountain side surface, a long protective film for protecting the ink fountain inner surface is pulled out from the protective film supply roll, and the ink fountain bottom surface is covered via an ink key. Further, the protective film is passed through the ink fountain so as to extend therethrough, and a portion of the protective film covering the bottom of the ink fountain is drawn out of the ink fountain, and a new portion drawn out of the protective film supply roll. Is provided on the bottom of the ink fountain, provided with a protective film transport device to run, further, as the protective film,
It has a width approximately equal to the bottom surface of the ink fountain, a constant width portion for covering the bottom surface of the ink fountain, and a flap portion provided on both side edges at a constant pitch in the longitudinal direction to cover the side surface of the ink fountain. In addition, the ink fountain device uses an ink fountain side plate, which is in contact with the original roller to form an ink fountain, and an operating position lower than the operating position. An ink fountain driving device for moving the ink fountain to a retreat position where no trouble occurs is provided.

In the ink fountain device having the above-described structure, the protective film covers the bottom surface of the ink fountain and the side surface of the ink fountain during normal printing to protect the ink fountain from being stained with ink. The driving device moves the ink fountain side plate and the ink fountain main body to the retracted position, and in this state, the protective film transport device runs the protective film to pull out the portion of the protective film covering the ink fountain bottom surface, and a new portion is formed. Is positioned on the bottom of the ink fountain, and then the ink fountain drive lifts the ink fountain side plate and the ink fountain main body to the original operating position, with the ink fountain side plate inside the flaps formed on both sides of the protective film. Into a position to protect the ink fountain side plate. Thus, the bottom of the ink fountain and the side surface of the ink fountain are covered by a new portion of the protective film, and therefore, the ink smear has been eliminated, in other words, the ink fountain has been washed, and can be prepared for the next printing operation. Eliminates the need for manual ink fountain cleaning.

Here, the flap portion formed on the protective film has a shape having a side surface protecting portion for covering a side surface of the ink fountain, and a margin portion to be inserted between the original roller and the ink fountain side plate. Is preferred. With this configuration, the flap portion not only covers the surface of the ink fountain side plate (side surface of the ink fountain), but also covers and protects the end surface of the ink fountain pressed against the original roller. Thus, the adhesion of the ink can be favorably prevented.

In addition, cylindrical members are arranged at both ends of the original roller at positions facing the ink fountain side plate so as to be able to stand still irrespective of the rotation of the original roller, and the cylindrical member is provided between the ink fountain side plate and the ink fountain side plate. It is preferable that the protection film has a configuration in which the margin of the flap portion is sandwiched and fixed. With this configuration, the margin portion of the flap portion can be fixed by being sandwiched between the cylindrical member and the ink fountain side plate, so that even if the flap portion comes into contact with the rotating original roller surface, it is pulled and moved. Therefore, it is possible to keep the state in which the protective film is always attached to the side of the ink fountain during printing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a schematic cross-sectional view showing an essential part of an ink device provided with an ink fountain device according to an embodiment of the present invention provided in an offset printing machine or letterpress printing machine, and FIG. 2 is a schematic side view of the ink fountain device. 3 is a schematic plan view of the ink fountain device, FIG. 4 is a schematic plan view of a part of a protective film used in the ink fountain device, and FIGS.
(C) is a schematic perspective view showing the ink fountain device in a different operating state, and FIGS. 6 (a), (b), (c),
(D) is a schematic side view which shows the ink fountain device in a different operation state, respectively. 1 to 6, reference numeral 1 denotes a frame of a printing unit, 2 denotes an ink fountain device (to be described in detail later), 3 denotes an original roller constituting a part of the ink fountain device 2, 4 denotes a call roller, and 5 denotes an ink kneading device. Rollers, which constitute an inking device for supplying ink to a plate cylinder (not shown).

The ink fountain device 2 includes an original roller 3, an ink fountain main body 7 which is disposed in proximity to the original roller 3 and forms a flat ink fountain bottom surface 7 a, and an ink fountain bottom surface 7 a formed on the ink fountain main body 7. A plurality of ink keys 8 provided at the lower end and capable of adjusting the gap with the original roller 3, ink rod adjusting rods 9 for adjusting the positions of the ink keys 8, and fixed to both ends of the ink fountain body 7 And an ink fountain side plate 10 which forms the ink fountain side surface 10a. The ink fountain side plate 10 has an arc-shaped end surface 10b pressed against the outer peripheral surface of the original roller 3 to prevent ink leakage. The ink fountain main body 7 and the ink fountain side plate 10 are mounted so as to be pivotable about a support shaft 11, and the end face 10b of the ink fountain side plate 10 contacts the original roller 3 to form an ink fountain with the original roller 3. Positions (positions shown in FIGS. 5A and 6A);
The retracted position (FIG. 5)
(B), the position shown in FIG. 6 (b)]. The ink fountain main body 7 and the ink fountain side plate 10 include:
An ink fountain driving device (not shown) such as an air cylinder for reciprocating the ink fountain main body 7 and the ink fountain side plate 10 to the operating position and the retracted position is connected.

The ink fountain device 2 further includes a long protective film 15 for protecting the inner surface of the ink fountain, a protective film supply roll 16 for feeding out the protective film 15, and an ink key 8 drawn out of the protective film supply roll 16. The portion of the protective film 15 that has been passed through the ink fountain bottom surface 7a through the ink fountain bottom surface 7a is pulled out, and the protective film 15 is moved so that a new portion is positioned on the ink fountain bottom surface 7a. A protective film transport device 17 is provided. In the present embodiment, a guide roller 18 provided as a protective film transport device 17 to guide the protective film 15 downstream of the ink fountain main body 7,
A take-up roll 19 for winding up the protective film 15 is provided, and the take-up roll 19 has a drive motor (not shown).
Are connected. Further, upstream of the take-up roll 19, a residual ink removing device 21 for scraping and removing residual ink 20 (see FIG. 6C) on the protective film 15 is provided. A guide roller 22 is provided upstream of the ink fountain main body 7. Protective film supply roll 1
6, the guide rollers 22, 18, the take-up roll 19, and the like are provided at fixed positions separately from the ink fountain main body 7. In addition,
Protective film supply roll 1 for feeding out protective film 15
6 is provided with a brake (not shown) so that an appropriate tension can be applied to the protective film 15 fed out.

The protective film 15 used here is shown in FIG.
As shown in the figure, on both side edges of the continuous constant width portion 15a,
Flap portions 15b for covering the side surface of the ink fountain are formed at a constant pitch in the longitudinal direction.
When it is wound up, it is attached to the ink fountain device so as to advance in the direction of arrow A in FIG. The width of the fixed width portion 15a is set equal to the width of the ink fountain bottom surface 7a between the pair of ink fountain side surfaces 10a and 10a. Flap portion 15b includes a side surface protective portion 15b ₁ of substantially triangular covering the ink fountain side, margin portions 15 provided subsequently
It consists b ₂ Prefecture, the margin portion 15b ₂ is for being sandwiched between the fountain roller 3 and the ink fountain side plate 10 as shown in FIG. Here, the side surface protection portion 15b ₁ of the flap portion 15b is uniform width portion 15 over its entire length
a, but the margin 15b ₂ has a constant width 1
A small cut 15c is interposed between the fixed width portion 15a and the fixed width portion 15a. Since in this way to separate the margin portion 15b ₂ from a constant width portion 15a, while suppressing the occurrence of wrinkles when worn against the ink fountain of the protective film 15, a margin portion 15b ₂
Can be inserted between the ink fountain side plate 10 and the original roller 3. The inner portion 15d of the cut 15c is rounded, thereby preventing the protective film 15 from being torn from the cut 15c as a starting point.

The material constituting the protective film 15 may be a soft resin film. For example, a film such as PET (polyethylene terephthalate), nylon, polypropylene, or polycarbonate can be used. Is preferably a polycarbonate film. The thickness of the protective film 15 is 100 to 200 μm in consideration of durability, flexibility, and the like.
It is preferable to set the degree. Further, if the film surface is subjected to a hard coat treatment, the durability of the film can be greatly improved.

In FIG. 2, a protective film supply roll 1
During the transportation of the protective film 15 drawn out from 6,
A winding length measuring roller 23 is arranged and connected to a rotary encoder 24. The rotary encoder 24 is moved by the take-up roll 19 to protect the protective film 15.
When a new portion of the protective film 15 is fed onto the ink fountain bottom surface 7a, the feed amount of the protective film 15 is measured, and a desired position in the longitudinal direction of the protective film 15 (the position where the flap portion 15b is provided) is determined. Ink bottom correctly 7
It is provided so that it can be positioned on a.
In addition, the positioning when the protective film 15 is wound up,
The present invention is not limited to the case where the winding length measuring roller 23 and the rotary encoder 24 are used, and can be changed as appropriate. For example, a small hole or a mark for sensor detection is provided in the protective film 15 at a constant pitch, and the transport path of the protective film 15 is provided. A method may be adopted in which a photoelectric sensor is disposed in the sensor and a small hole or mark for detecting the sensor is detected.

3 and 7, at both ends of the original roller 3, a cylindrical member 30 having an outer diameter substantially equal to the outer diameter of the original roller 3 is rotatable with respect to the original roll 3, so that the original roller 3 is rotated. Are arranged so that they can be stopped even if they rotate. At least a portion of the ink fountain side plate 10 which is in contact with the original roller 3 is formed to be thick and is pressed against both the original roller 3 and the cylindrical member 30.

Although not shown, a sequence control device for automatically performing a cleaning operation described below is provided.

Next, the operation of the ink fountain device 2 having the above configuration will be described. At the time of normal printing, the ink fountain main body 7 and the ink fountain side plate 10 are shown in FIGS.
(A) Occupies the operating position shown in FIG.
Reference numeral 5 covers the inner surface of the ink fountain. That is, the fixed width portion 15a (see FIG. 4) of the protective film 15 is
And the bottom of the ink fountain 7a, and the flap 15b
Side protective portion 15b ₁ of which covers the ink fountain side 10a, it is sandwiched between further margin portion 15b ₂ of the ink fountain side plate 10 and the fountain roller 3 and the cylindrical member 30. Printing is performed in this state. That is, in FIG. 1, the original roller 3 slowly rotates in the direction of the arrow, and the ink supplied into the ink fountain forms an ink film on the outer peripheral surface of the original roller 3, and the ink contacts the original roller 3. The ink is supplied to the inking roller 4 which has been moved to the position, and then the inking roller 4 is moved to a position where it contacts the inking roller 5 to transfer the ink to the inking roller 5.

During this operation, the ink fountain main body 7 and the ink fountain side plate 10 are not contaminated with ink because the inner surface of the ink fountain is covered with the protective film 15 as well as the bottom surface. Further, since the original roller 3 rotates, the extra portion 15b ₂ of the protective film 15 sandwiched between the original roller 3 and the ink fountain side plate 10 may be pulled by the original roller 3, but this extra portion 15b ₂ is sandwiched and fixed between the non-rotating cylindrical member 30 and the ink fountain side plate 10, so that the protective film 15 does not move to cause trouble. Incidentally, good slipperiness of the protective film 15, even without fixing the margin portion 15b ₂ in the cylindrical member 30 and the ink fountain side plate 10, a margin portion 15b ₂ in contact with the fountain roller 3 is pulled by the fountain roller 3 If there is no fear, the cylindrical member 30 may be omitted.

When the ink fountain is to be washed after printing, the wash button of the sequence controller is pressed. Then
As shown in FIG. 5B and FIG.
And the ink fountain side plate 10 is lowered to the retracted position. As a result, the distance between the ink key 8 and the original roller 3 is widened, so that the protection film 15 can easily travel, and most of the ink fountain side plate 10 travels along the travel path of the protection film 15 extending from the ink key 8 to the guide roller 18. Located below
Therefore, the ink fountain side plate 10 does not hinder the traveling of the flap portion when the protective film 15 travels, and the protective film 15 can be wound up.

Next, as shown in FIG. 6C, the take-up roll 19 rotates to wind up the protective film 15 by a predetermined amount.
The portion soiled with the remaining ink 20 is taken up, and a new predetermined portion of the protective film 15 is moved above the ink fountain main body 7. At this time, an appropriate braking force is applied to the supply roll 16 and an appropriate tension is applied to the moving protective film 15 so that the protective film 15 does not sag and cause trouble. The remaining ink 20 on the protective film 15 is removed by a remaining ink removing device 21.
The ink is scraped and removed, thereby preventing a large amount of ink from being caught in the take-up roll 19 and causing trouble.

After the protective film 15 has been moved by a predetermined amount, the ink fountain main body 7 and the ink fountain side plate 10 return to their original operating positions as shown in FIGS. 5 (c) and 6 (d). At this time, when the ink fountain side plate 10 moves upward, the ink bottle side plate 10 moves while folding the flap portion 15b located thereon upward, and the end surface 10b, the original roller 3 and the cylindrical member 30 move.
Scissors narrowing to secure the margin portion 15b ₂ of the flap portion 15b between (see FIG. 7). Thus, the protective film 15 is stuck to the inner surface of the ink fountain (the bottom surface 7a of the ink fountain and the end surface 10a of the ink fountain), and the cleaning operation is completed. In order to satisfactorily fold the flap portion 15b by raising the ink fountain side plate 10, the protective film 1
It is preferable that the constant width portion 15a at the center of 5 is held at a fixed position when the flap portion 15b is bent. For this purpose, an appropriate tension is applied to the fixed width portion 15a and the tension is maintained. Preferably.

As described above, the ink fountain cleaning operation is automatically performed, and the work load on the operator is greatly reduced. This ink fountain cleaning operation is performed simultaneously for a plurality of printing units provided in the printing press. Thus, cleaning of each ink fountain of the printing press can be easily performed in an extremely short time, and the downtime of the printing press can be reduced to improve productivity. Note that, in parallel with the ink fountain cleaning operation, a cleaning operation of other rollers of the inking device is also performed. After the end of the cleaning operation, supply ink to the ink fountain,
Enter the printing operation.

In the above embodiment, the ink fountain main body 7 and the ink fountain side plate 10 can be turned around the support shaft 11. Since this structure also includes an existing ink fountain device that has been conventionally used, the ink fountain device of the above embodiment can be manufactured by adding a small modification to the existing ink fountain device, and thus can be manufactured at low cost. It has the effect that it can be manufactured. However, the present invention is not limited to the ink fountain body 7.
The mechanism for moving the ink fountain side plate 10 between the operating position and the retracted position is not limited to the case where the ink fountain side plate 10 is turned around the support shaft 11 as described above, but may be a moving mechanism of another type, for example, a mechanism for linearly moving the ink fountain side plate 10. You may change to use. That is, the ink fountain body 7 and the ink fountain side plate 1
0 may be linearly retracted obliquely downward from the operating position while maintaining the same posture.

Further, in the above embodiment, the protective film 15
The take-up roll 19 is used as the protective film transporting device 17 for traveling. However, the protective film transporting device 17 is not limited to this configuration, and can be appropriately changed. Downstream of the drive roller and the pressing roller, the protective film 15 may be transported while being transported, and the fed protective film 15 may be discharged to an appropriate discharge film box.

In the above embodiment, as can be clearly understood from FIG. 7, the ink fountain side plate 10 is arranged such that the end face thereof is pressed against the end of the roller surface of the original roller 3 and the cylindrical member 30. However, the present invention is not limited to this configuration, and can be modified as shown in FIG. That is, as shown in FIG. 8, the ink fountain side plate 10A is pressed against the end surface 3a of the original roller 3 while the ink fountain side plate 10A is pressed.
A small-diameter cylindrical member 3 provided at the end of the original roller 3
0A, the protective film 15 between the ink fountain side plate 10A and the original roller 3 and the cylindrical member 30A.
It is also possible to adopt a configuration in which the Komu a margin portion 15b ₂ scissors.

FIG. 4 shows a protective film 15 used in the present invention.
The structure is not limited to the structure shown in FIG. 1 and can be changed as appropriate. For example, the protective films 15A and 15B shown in FIGS. 9 and 10 can be used. Here, the protective film 15A, the tip constant width portion of the margin portion 15b ₂ 15 shown in FIG. 9
a is connected by a thin connecting portion 15e, and the other configuration is the same as that shown in FIG. Thus, the connecting portion 15
When the tip of the margin portion 15b ₂ keep connected to the constant width portion 15a at e, (the arrow B direction) to front margin portion 15b ₂ in the production of the protective film 15A when winding while traveling, margin portion There is obtained an advantage that the winding operation is easy without 15b ₂ fluttering. The protective film 15B shown in FIG. 10 has a rectangular flap portion 15b 'divided on both sides of a fixed width portion 15a by a cut 15f extending in the lateral direction.
b 'is also the side surface protection portion 15b ₁ to protect the ink fountain side'
When, and a fountain roller and a margin portion 15b ₂ which is sandwiched between the ink fountain side plates'. The protective film 15B of this embodiment is used in the same manner as the protective film 15 shown in FIG.
Since 5b ₁ ′ is larger than the ink fountain side surface 10, it extends upward from the ink fountain, but there is no problem. Also,
If it gets in the way, it may be folded at the upper end of the ink fountain side plate. This protective film 15B has an advantage that the manufacturing process is simplified because there are few punched parts during manufacturing.

[0028]

As described above, according to the present invention, as the protective film disposed on the inner surface of the ink fountain, a protective film having flaps on both side edges is used, and the ink fountain main body and the ink fountain side plate are used. Since it is configured to be moved to the operating position to be formed and the retracted position lower than that position, it is possible to cover the bottom of the ink fountain and the side of the ink fountain with a protective film at the time of normal printing, and to wash for color change, etc. Occasionally, the ink fountain body and ink fountain side plate are moved to the evacuation position, the protective film is run in that state, the portion of the protective film that covered the ink fountain bottom is pulled out, and a new part is positioned on the ink fountain bottom. Then, lift the ink fountain main body and ink fountain side plate to the original operating position,
The flaps formed on both sides of the protective film can be folded inward to protect the sides of the ink fountain, and the bottom of the ink fountain and the side of the ink fountain can be extremely easily and quickly changed to a new part of the protective film. In other words, the ink fountain can be cleaned, and the ink fountain cleaning operation that has been performed manually in the past can be reduced, the downtime of the printing press can be reduced, and productivity can be improved. This has the effect. Further, since the apparatus of the present invention can be configured by simply modifying an existing ink fountain apparatus, the apparatus can be manufactured at low cost.

Here, when the flap portion formed on the protective film has a shape having a side surface protection portion for covering the side surface of the ink fountain, and a margin portion inserted between the original roller and the ink fountain side plate, The flap portion covers and protects not only the surface of the ink fountain side plate (the side surface of the ink fountain) but also the end face pressed against the original roller, so that the ink fountain side plate is reliably protected and ink adhesion can be prevented well. The effect is obtained.

A cylindrical member is provided at both ends of the original roller and opposed to the ink fountain side plate so that the cylindrical member can be stopped even when the original roller rotates, and a protective film is provided between the cylindrical member and the ink fountain side plate. Insert the extra flap part,
With this configuration, the margin of the flap can be fixed by sandwiching the margin of the flap between the cylindrical member and the ink fountain side plate. The effect is obtained that the middle protective film can always be kept in a state of being stably adhered to the side surface of the ink fountain.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a main part of an ink device having an ink fountain device according to an embodiment of the present invention.

FIG. 2 is a schematic side view of the ink fountain device.

FIG. 3 is a schematic plan view of the ink fountain device.

FIG. 4 is a schematic plan view of a part of a protective film used in the ink fountain device.

5 (a), 5 (b) and 5 (c) are schematic perspective views showing the ink fountain device in different operating states, respectively.

FIG. 6 (a), (b), (c), (d)
Schematic side view showing the ink fountain device in different operating states

FIG. 7 is a schematic perspective view showing a contact portion between the ink fountain side plate and the original roller of the embodiment.

FIG. 8 is a schematic perspective view showing a contact portion between an ink fountain side plate and a base roller in another embodiment of the present invention.

FIG. 9 is a schematic plan view of a part of a modified example of the protective film used in the present invention.

FIG. 10 is a schematic plan view of a part of still another modification of the protective film.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 Printing unit frame 2 Ink fountain device 3 Source roller 4 Recall roller 5 Ink mixing roller 7 Ink fountain body 7 a Ink bot bottom surface 8 Ink key 9 Ink key adjustment rod 10 Ink fountain side plate 10 a Ink fountain side surface 11 Support shaft 15 Protective film 15 a Constant Width portion 15b Flap portion 15b ₁ Side protection portion 15b ₂ Extra space 16 Protective film supply roll 17 Protective film transport device 19 Take-up roll 20 Residual ink 21 Residual ink removing device 23 Roll-up length measuring roller 24 Rotary encoder 30 Cylindrical member

Claims (3)

[Claims] 1. A base roller, an ink fountain body disposed close to the base roller and forming an ink fountain bottom surface, and provided at a lower end of the ink fountain bottom surface to adjust a gap between the base roller and the base roller. A possible ink key, an ink fountain side plate fixedly provided at both ends of the ink fountain main body and forming an ink fountain side surface, and a long protective film for protecting the ink fountain inner surface, comprising a protective film supply roll. Drawn out of, and a protective film passed through the ink key to cover the bottom of the ink fountain, and a portion of the protective film covering the bottom of the ink fountain is drawn out of the ink fountain,
A protective film transport device for running the protective film so as to position a new portion drawn from the protective film supply roll on the bottom of the ink fountain, wherein the protective film has a width substantially equal to the bottom of the ink fountain. A fixed width portion for covering the bottom surface of the ink fountain, and a flap portion provided on both side edges thereof at a constant pitch in the longitudinal direction to cover the side surface of the ink fountain. Ink fountain drive for moving the side plate to an operating position where the side plate is brought into contact with the original roller to form an ink fountain, and a retracted position that is lower than the operating position and does not hinder the running of the flap portion when the protective film runs. An ink fountain device for a printing press, comprising the device. 2. A method according to claim 1, wherein the flap portion of the protection film has a side surface protection portion for covering a side surface of the ink fountain, and a margin portion inserted between the ink fountain side plate and the original roller. Item 2. An ink fountain device for a printing press according to Item 1. 3. The ink jet printer according to claim 1, wherein the original roller has a cylindrical member which can be stopped regardless of the rotation of the original roller, at positions on both ends thereof opposite to end faces of the ink fountain side plate. 3. The ink fountain device for a printing press according to claim 2, wherein an extra portion of the flap portion of the protective film is sandwiched and fixed between the two.