JPH04115648U - Ink supply device for offset printing presses - Google Patents

Abstract

(57) [Summary] [Objective] To provide an ink supply device for an offset printing press that can always perform stable printing by constantly supplying high-viscosity ink. [Structure] A doctor blade mechanism that can adjust the ink film thickness on the ink source roller by the width of one newspaper page is installed near the ink source roller, and a spiral shaft for stirring the collected ink is installed in the ink pan. The ink return flow path includes the ink return flow path.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an ink supply system for offset printing machines used for newspaper printing, etc. (hereinafter referred to as the ink supply device), especially the ink stored in the ink tank. The ink is supplied to the plate cylinder through multiple rollers including the ink source roller, and excess ink is removed from the ink. The ink is scraped and collected by the ink return blade, and the collected ink is passed through the ink pan. The present invention relates to an ink supply device configured to return ink to an ink tank.

0002

[Conventional technology]

In a conventional offset printing press, the ink supply device has many divided inks. It is equipped with pot keys, and when printing, operate these keys one by one to move the print cylinder to the plate cylinder. The supply of ink was carried out as specified.

0003 However, in recent years, as a means of uniformly supplying ink to the plate cylinder, for example, Using a special mesh roller such as anilox roller (product name), Remove excess ink and water using a ladle and return them to the ink pan. A keyless (keyless) system has been developed and put into practical use.

0004

[Problem that the idea aims to solve]

By the way, newspaper printing is usually done using a rotary printing press using an offset printing method. However, in this type of rotary printing press, printing is normally performed using A roll paper of A roll width. However, in some cases, use D roll paper that is 1/2 the width of A roll or C roll paper that is 3/4 the width of A roll. Sometimes.

[0005] In that case, the ink supply device that adopts the keyless method described above does not require paper. The ink supply in that area cannot be stopped, and the ink in that area is affected by the ink return brake. The dampening water is collected along with the ink at this time. This will return to the ink tank.

[0006] In this way, the amount (ratio) of water contained in the ink supplied to the plate cylinder is However, if the moisture content of the ink exceeds 30%, printing becomes impossible. Due to the disadvantages of is preferable. Also, the water contained in the collected ink does not mix completely with the ink. often not.

[0007] This invention was made with the above-mentioned considerations in mind, and its purpose is to: Even if dampening water is mixed in with the collected ink, make sure to thoroughly stir the ink and dampening water. This prevents printing problems such as uneven printing, and allows you to print on narrow paper. When using it, it is possible to stop the ink supply to areas where there is no paper, and it is also possible to This product enables stable printing at all times by constantly supplying high-quality ink. An object of the present invention is to provide an ink supply device.

[0008]

[Means to solve the problem]

In order to achieve the above object, the following three ideas are adopted in this application.

[0009] The ink supply device according to the first invention supplies ink stored in an ink tank. The ink is supplied to the plate cylinder via multiple rollers, including the ink source roller, and excess ink is returned to the ink. The ink is scraped and collected by a blade, and the collected ink is sent to the ink pan via an ink pan. In the ink supply device of an offset printing press configured to return the ink to the ink tank. , a mechanism for stirring the collected ink is provided in the ink return flow including the ink pan. It is characterized by being installed on the road.

0010 The ink supply device according to the second invention supplies the ink stored in the ink tank to the ink supply device. The ink is supplied to the plate cylinder via multiple rollers, including the ink source roller, and excess ink is returned to the ink. The ink is scraped and collected by a blade, and the collected ink is sent to the ink pan via an ink pan. In the ink supply device of an offset printing press configured to return the ink to the ink tank. , the ink film thickness on the ink source roller can be adjusted in increments of one newspaper page width. It is characterized by a doctor blade mechanism installed close to the ink source roller. There is.

[0011] The ink supply device according to the third invention supplies the ink stored in the ink tank to the ink supply device. The ink is supplied to the plate cylinder via multiple rollers, including the ink source roller, and excess ink is returned to the ink. The ink is scraped and collected by a blade, and the collected ink is sent to the ink pan via an ink pan. In the ink supply device of an offset printing press configured to return the ink to the ink tank. , the ink film thickness on the ink source roller can be adjusted in increments of one newspaper page width. In addition to installing a doctor blade mechanism close to the ink source roller, A mechanism for stirring the ink is provided in the ink return flow path including the ink pan. It is characterized by

0012

[Effect]

According to the first invention, even if dampening water is mixed in the collected ink, the ink By thoroughly stirring the ink and dampening water, the water can be evenly dispersed within the ink. Even if the moisture content is higher than before, printing problems such as uneven printing can be prevented. will not occur.

[0013] According to the second invention, the ink film thickness on the ink source roller is determined by the width of one newspaper page. When using paper with a small width, the area without paper can be adjusted. The ink supply can be stopped for a minute, so there is no recovered ink in the said section. At the same time, there is no dampening water to be collected, so the ink content in the ink tank is reduced. Increase in water rate is prevented.

[0014] According to the third invention, an increase in the moisture content of the ink in the ink tank is prevented. At the same time, the water can be uniformly dispersed within the ink. Also, always stick to Can supply high quality ink.

[0015]

【Example】 Embodiments of the present invention will be described below with reference to the drawings.

[0016] First, Figure 2 shows the main parts of an offset printing machine incorporating the ink supply device of the present invention. In this figure, 1 is a blank cylinder, and 2 is arranged so as to be in contact with the blank cylinder 1. It is a printing cylinder. An ink supply device 3 and a dampening water supply device 4 are installed below the plate cylinder 2. I'm being kicked.

[0017] The ink supply device 3 includes an ink tank 5 containing ink I used for printing. , ink pump 6, ink nozzle 7, ink source roller 8, and doctor brake. The gap between the head mechanism 9 (the structure of which will be described later) and the ink source roller 8 Adjustable spiral roller 10, transition rollers 11, 12, ink cylinder 13, kneading Consists of roller 14, ink form rollers 15, 16, transition roller 17, return roller 18, etc. The ink train 19, the ink return blade 20, the ink pan 21, and this ink pan The ink return channel 22 connects between the ink tank 5 and the ink tank 5. Also, The dampening water supply device 4 includes a water pan 23 containing dampening water, a water source roller 24, and a brush. It consists of a roller 25, a water cylinder 26, a water application roller 27, etc.

[0018] By the way, the ink I in the ink tank 5 is pumped by the ink pump 6. The surface of the ink source roller 8 that is raised and reaches the ink nozzle 7 and rotates in a predetermined direction. The ink is sprayed onto the surface by the ink nozzle 7, but in this embodiment, the ink is The adhesion amount of ink I on the surface of the original roller 8 is determined by the ink film thickness per newspaper page width. configured to be controlled by a doctor blade mechanism 9 that can be adjusted in are doing.

[0019] See FIG. 1 and FIGS. 3(A) and 3(B) for the configuration of the doctor blade mechanism 9. To explain, 28 is located slightly above the rotation axis of the ink source roller 8 (not shown). This shaft is horizontally installed parallel to this shaft, and each shaft has one newspaper page on its outer periphery. Four pipes 29 with lengths corresponding to the widths (e.g. 400 mm) are shown in Figure 3(B). It is attached so that it can rotate in the direction of the arrow X-Y shown.

[0020] The lower outer peripheral portion of each pipe 29 facing the ink source roller 8 is provided with a pipe 29 and a Four doctor blades 30 of the same length are connected to the ink source roller without overlapping. It is installed parallel to 8. In addition, there is a bracket on the upper surface of each pipe 29, approximately in the center. At the same time, four brackets 31 are provided on the shaft 28 so as to correspond to each bracket 31. A bracket 32 is provided protrudingly, and furthermore, these opposing brackets 31 and 32 are each provided with a shape. An adjustment screw 34 with a knob 33 is screwed into the screw hole (not shown).

[0021] Therefore, in the doctor blade mechanism 9 having the above configuration, one doctor blade When the knob 33 corresponding to the door 30 is rotated in the direction of arrow R shown in FIG. 3(B), the adjustment screw The pipe 34 moves toward the bracket 31, and the pipe 29 rotates slightly in the direction of the arrow The gap between the blade 30 and the ink source roller 8 is opened, and the knob 33 is moved forward. When rotated in the opposite direction, the adjustment screw 34 will move back toward the bracket 32, and the pipe will The blade 29 rotates slightly in the direction of arrow Y, and the doctor blade 30 and ink source roller 8 The gap between the two is narrowed. In other words, by rotating knobs 33 individually, , the film thickness of ink I on the surface of the ink source roller 8 is measured in units of one newspaper page width. can be adjusted.

[0022] The gap between the doctor blade 30 and the ink source roller 8 and the ink source roller The gap between roller 8 and spiral roller 10 is determined as follows depending on the width of the paper used. It is set as follows. In other words, when using wide paper with A roll width, ink I Since the ink needs to be supplied to all of the ink source rollers 8, all the doctor The gap between the blade 30 and the ink source roller 8 is widened and set to 0.2 mm. Also, the gap between the ink source roller 8 and the spiral roller 10 is set to 0.08 mm. The ink I is then supplied to the ink train 19 via the ink source roller 8.

[0023] When using narrow paper such as C-roll paper or D-roll paper, make sure to To stop the supply of ink I, use the doctor blade 30 corresponding to this part and the ink The gap with the key roller 8 is narrowed and set to 0.04 mm.

[0023] Ink supplied from the ink source roller 8 to the ink train 19 as described above I is applied to the surface of the plate cylinder 2 via the ink cylinder 13 and the ink forming rollers 15, 16. At this time, the excess ink I passes through the ink cylinder 13 and the transfer roller 17. The ink is transmitted to the return roller 18 via the ink return roller 18, which is provided near the return roller 18. The ink is scraped off by the blade 20 and returned to the ink pan 21.

[0024] When the ink I is supplied to the surface of the plate cylinder 2, the dampening agent in the water pan 23 Water is supplied to the plate cylinder 2 by the dampening water supply device 4 in the following manner. That is, The dampening water in the water pan 23 is spread onto its surface by the rotation of the water base roller 24 in a predetermined direction. The dampening water that has adhered to the surface of the water base roller 24 is then transferred to the water base roller 24. Due to the rotation of the brush roller 25, which rotates in contact with the It is lifted up and attached to the surface of the water cylinder 26, and furthermore, it is attached to the surface of this water cylinder 26. The adhered dampening water is passed through the dampening roller 27, which rotates in contact with the water cylinder 26. It is supplied to the surface of the plate cylinder 2 through the plate cylinder 2.

[0025] By the way, most of the dampening water supplied to the surface of the plate cylinder 2 as described above is The remaining ink is scraped off by the ink returning blade 20. Mixing with the ink I that is taken and returned to the ink pan 21 and returning to the ink pan 21 become. Therefore, the ink collected in the ink pan 21 (hereinafter referred to as collected ink I') ) will include dampening water.

[0026] Therefore, in this embodiment, a mechanism for stirring the recovered ink I' is provided in advance. It is provided in the ink return flow path 22 including the ink pan 21, and the ink contained in the recovered ink I' is The moisture contained in the ink and the ink I can be sufficiently stirred.

[0027] The ink pan 21 is provided below the ink source roller 8, as shown in FIG. , when ink I is sprayed and supplied from the ink nozzle 7 to the ink source roller 8. In addition to receiving the ink I dripping on the It receives collected ink I' and extends in the axial direction of the ink source roller 8. is structured as follows.

[0028] That is, a recess 35 is formed in the lower part of the ink pan 21, and inside this recess 35 there is a 1, in order to stir the recovered ink I', it is placed almost parallel to the ink source roller 8. A helical shaft 36 serving as a mechanism is horizontally installed so as to be rotatable, and the spiral shaft 36 is horizontally disposed so as to be rotatable. At the intermediate position, there is a discharge port for discharging the recovered ink I' in the direction of the ink return flow path 22. 37 are provided.

[0029] The shape of the helical blade 38 on the helical shaft 36 is determined from the longitudinal center of the shaft (discharge port). The shape is symmetrical with respect to the border (near 37), and the recovered ink I' in the ink pan 21 The structure is such that it is smoothly conveyed in the direction of the discharge port 37 while stirring. In addition , 39 is a motor for rotating the helical shaft 36 in a predetermined direction.

[0030] The ink return flow path 22 receives recovered ink I' discharged from the ink pan 21. The ink is returned to the ink tank 5, but this ink return flow path 22 is close to the ink tank 5. As shown in FIG. The end is connected to the ink tank 5, and there is a mechanism for stirring the recovered ink I' inside. A stirring conveyance path 41 is formed that accommodates a helical shaft 40.

[0031] The shape of the helical blade 42 on the helical shaft 40 is such that the recovery flowing in from the upstream opening 43 It is configured to transport the ink I' in the 5 directions of the ink tank while stirring it. . In addition, 44 is a motor for rotating the helical shaft 40 in a predetermined direction, and 45 is an ink pump. This is a drive motor.

[0032] According to the ink supply device 3 having the above configuration, the ink on the ink source roller 8 is The film thickness can be adjusted in increments of one newspaper page width, so high viscosity ink I can be used constantly. In addition, when using paper with a small width, it is possible to The supply of ink I can be stopped for a minute, so that the recovered ink I' of the said part is no longer available. At the same time, the collected dampening water also runs out, so the dampening water in the ink tank 5 decreases. An increase in the water content of Ink I is prevented.

[0033] Even if dampening water is mixed in the recovered ink I', the ink pan 21 and the ink The helical shafts 36 and 40 provided in the ink return channel 22 ensure that the ink I and dampening water are sufficiently supplied. Because water can be stirred uniformly in the recovered ink I', Printing problems such as uneven printing may occur even if the moisture content is higher than that of do not have.

[0034] In the above embodiment, the ink film thickness on the ink source roller 8 is set to the width of one newspaper page. A doctor blade mechanism 9 that can be adjusted in units is placed close to the ink source roller 8. In addition, spiral shafts 36 and 40 for stirring the recovered ink I' are provided as an ink tank. Although it is provided in the pan 21 and the ink return flow path 22, it is not necessary to configure it in this way. For example, only the doctor blade mechanism 9 may be provided; and 40 may be provided. Furthermore, only one of the spiral shafts 36 and 40 is provided. It's okay.

[0035]

[Effect of the idea]

As explained above, according to the structure of claim 1, dampening water is applied to the collected ink. Even if the ink and dampening water are mixed together, the water can be mixed into the ink by stirring the ink and dampening water thoroughly. can be evenly dispersed, so even if the moisture content is higher than before, it will not be difficult to print. Printing problems such as uneven printing do not occur.

[0036] Further, according to the structure of claim 2, the thickness of the ink film on the ink source roller can be adjusted for one newspaper page. Since the adjustment can be made in increments of paper width, when using paper with a small width, the The supply of ink can be stopped to the area where there is no ink, so there is no need to collect ink from the area. At the same time, the collected dampening water also runs out, so the ink in the ink tank is This prevents an increase in the moisture content of the wood.

[0037] According to the structure of claim 3, the water content of the ink in the ink tank is reduced. In addition to preventing water from increasing, it is possible to uniformly disperse water within the ink.

[0038] Therefore, according to the present invention, it is possible to constantly supply ink with high viscosity. , it is possible to always perform stable printing.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of an ink supply device according to the present invention.

FIG. 2 is a diagram showing a main part configuration of an offset printing press to which the ink supply device is applied.

FIGS. 3A and 3B are diagrams showing a configuration example of a doctor blade mechanism.

FIG. 4 is a side view showing an example of the configuration of a portion from an ink pan to an ink tank.

[Explanation of symbols]

2... Plate cylinder, 5... Ink tank, 8... Ink source roller, 9
...Doctor blade mechanism, 20...Ink return blade, 21
...Ink pan, 22...Ink return channel, 36, 40...Spiral shaft,
I...Ink, I'...Recovered ink.

Claims (3)

[Scope of utility model registration request] Claim 1: Ink stored in an ink tank is supplied to a plate cylinder via multiple rollers including an ink source roller, excess ink is scraped off and collected by an ink return blade, and the collected ink is transferred to an ink pan. An ink supply device for an offset printing press configured to return ink to an ink tank via the ink pan, wherein an ink return channel including the ink pan is provided with a mechanism for stirring the collected ink. ink supply device. Claim 2: The ink stored in the ink tank is supplied to the plate cylinder via multiple rollers including an ink source roller, the excess ink is scraped off and collected by an ink return blade, and the collected ink is sent to the ink pan. In the ink supply device of an offset printing press configured to return the ink to the ink tank through the ink source roller, a doctor blade mechanism that can adjust the ink film thickness on the ink source roller in units of one newspaper page width is provided near the ink source roller. An ink supply device for an offset printing press, characterized in that it is provided with: Claim 3: The ink stored in the ink tank is supplied to the plate cylinder via multiple rollers including an ink source roller, the excess ink is scraped off and collected by an ink return blade, and the collected ink is sent to the ink pan. In the ink supply device of an offset printing press configured to return the ink to the ink tank through the ink source roller, a doctor blade mechanism that can adjust the ink film thickness on the ink source roller in units of one newspaper page width is provided near the ink source roller. An ink supply device for an offset printing press, characterized in that the ink supply device for an offset printing press is provided with a mechanism for stirring the collected ink in an ink return flow path including the ink pan.