JP2002036504A - Ink supply device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply an ink amount for obtaining a desired image in response to a change of properties of the ink. SOLUTION: An ink supply device for a printer comprises an ink supply roller 8 rotatably supported around a central axis of itself, a doctor roller 9 for forming a predetermined gap between the roller 9 and an outer peripheral surface of the roller 8 along one generating line of the roller 8, an ink reservoir 22 provided cooperatively with a part of the roller 8 and a part of the roller 9, and an ink drive bar 10 extended at the reservoir 22 along the one generating line of the roller 8 and rotatable against the roller 8. In the device, the bar 10 is disposed so that an interval (a) between the outer peripheral surface of itself and the outer peripheral surface of the roller 9 and an interval (b) to the outer peripheral surface of the roller 8 are equal and an interval (c) between the outer peripheral surface of the itself and the profile of the reservoir 22 becomes a range of 1:0.7 to 1.1 as a ratio with the intervals (a) or (b).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply apparatus for a printing apparatus, and more particularly to an ink supply apparatus for a printing apparatus for keeping a supply amount of ink constant.

[0002]

2. Description of the Related Art A stencil printing apparatus is a general printing apparatus. The stencil printing apparatus has a plate cylinder in which a peripheral wall having a porous structure is arranged in a cylindrical shape and is rotatable around its own axis. On the outer peripheral surface of the peripheral wall, a perforated stencil sheet is wound and mounted. Inside the plate cylinder, there is an ink supply device for supplying ink to the outer peripheral surface side of the peripheral wall so as to pass the ink. Outside the plate cylinder, there is a pressing means for pressing the printing paper against the outer peripheral surface of the peripheral wall (plated stencil paper). Then, at the time of printing, the printing paper is supplied between the plate cylinder and the pressing means in synchronization with the rotation of the plate cylinder, and the printing paper is pressed against the stencil sheet on the plate cylinder. The ink passes through the perforated portion of the stencil sheet and transfers to the printing paper to form an image.

[0003] As shown in FIG. 4 (a), the ink supply device includes an ink supply roller 101 inside a plate cylinder 100.
have. The ink supply roller 101 is rotatably supported around its own central axis, and contacts the inner peripheral surface of the peripheral wall 102. The ink supply roller 101 is used for the plate cylinder 10.
It is driven to rotate in the same direction (arrow B) as the rotation of 0 (arrow A). In the vicinity of the ink supply roller 101, a doctor roller 103 is formed, which extends along one generatrix of the ink supply roller 101 and forms a predetermined gap with the outer peripheral surface of the ink supply roller 101. In the vicinity of the space between the ink supply roller 101 and the doctor roller 103, an ink drive rod 104 extending along the generatrix of the ink supply roller 101 is provided. The ink driving rod 104 is driven to rotate in the direction opposite to the rotation of the ink supply roller 101 (arrow C) in conjunction with the rotation of the ink supply roller 101. Further, a distributor 105 having an ink discharge port 105a is provided above the ink supply roller 101.

The ink supplied from the ink discharge port 105a of the distributor 105 is supplied to the ink supply roller 1
A wedge-shaped ink reservoir 106 is formed at the above-described predetermined interval between the doctor roller 103 and the doctor roller 103. The ink drive rod 104 extends into the ink reservoir 106. Then, the ink driving rod 104 and the ink supply roller 1
01 co-rotation generates a vortex in the ink in the ink reservoir 106. Next, the ink in the ink reservoir 106 uniformly spreads in the direction along the axis of the ink supply roller 101 so as to be entangled with the ink driving rod 104. As a result, the ink in the ink reservoir 106 is moved along the axis of the ink
01 and the doctor roller 103 are applied to the outer peripheral surface of the ink supply roller 101 while being measured at a predetermined interval.
02 is supplied to the inner peripheral surface.

[0005]

However, in the above-described ink supply apparatus of the conventional printing apparatus, the properties of the ink tend to change in the environment, and for example, the viscosity increases at low temperatures (10 ° C. or lower). In such a case, the entanglement of the ink with the ink drive rod 104 increases, and the amount of ink coming out of the predetermined distance between the ink supply roller 101 and the doctor roller 103 becomes extremely small. As a result, the ink supply amount in the rotation direction of the ink supply roller 101, the ink supply amount in the axial direction of the ink supply roller 101, or the ink supply amount during one rotation of the plate cylinder 100 varies. Blurring problems occur.

In the above-described ink supply device, FIG.
As shown in (a), an ink detecting needle 107 for detecting the amount of ink is arranged so as to come into contact with the outer peripheral surface of the ink reservoir 106, and the amount of ink decreases and the ink reservoir 106 is reduced.
Is configured to supply ink from the distributor 105 when the outer peripheral surface is separated from the ink detection needle 107. However, when the viscosity of the ink is increased as described above and the ink is entangled with the ink drive rod 104, as shown in FIG.
06 is the ink supply roller 101 and the doctor roller 10
There is a risk of separation from the third side. As a result, since the outer peripheral surface of the ink reservoir 106 does not separate from the ink detecting needle 107 and detects that the amount of ink is not insufficient, even if the amount of ink flowing out of the predetermined distance between the ink supply roller 101 and the doctor roller 103 decreases, the distributor 10
No ink is supplied from No. 5, which causes image blurring.

[0007] Further, it is conceivable that the same problem may occur when the properties of the ink are changed for the purpose of improving the ink performance in the future.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an ink supply apparatus for a printing apparatus which can supply an amount of ink for obtaining a desired image in response to a change in ink properties. It is an object.

[0009]

According to the present invention, there is provided an ink supply apparatus for a printing apparatus according to the present invention, wherein the ink supply apparatus is rotatable about its own central axis between opposing side plates. The ink supply roller was supported and extended between the side plates so as to form a predetermined gap between the ink supply roller and an outer peripheral surface of the ink supply roller along one generatrix of the ink supply roller. An ink amount control member, an ink reservoir portion provided in cooperation with a part of the ink supply roller and a part of the ink amount control member and the side plate, and the ink supply roller along one generatrix of the ink supply roller; Extending to the ink reservoir and supported between the side plates,
An ink drive rod that is rotatable in opposition to the ink supply roller, wherein the ink drive rod has an outer peripheral surface thereof with respect to an outer shape of the ink reservoir,
The distance between the outer peripheral surface of the ink amount control member and the outer peripheral surface of the ink supply roller is substantially the same.

According to a second aspect of the present invention, there is provided an ink supply apparatus for a printing apparatus, comprising: an ink supply roller rotatably supported around its own central axis between side plates facing each other; and one of the ink supply rollers. Along the generatrix, and an ink amount control member extending and supported between the side plates so as to form a predetermined gap between the ink supply roller and the outer peripheral surface of the ink supply roller, and a part of the ink supply roller and the ink supply member. An ink reservoir provided in cooperation with a part of the ink amount control member and the side plate, and extending between the ink reservoirs along one generatrix of the ink supply roller and supported between the side plates;
An ink drive rod that is rotatable in opposition to the ink supply roller, wherein the ink drive rod has an interval between an outer peripheral surface of the ink drive rod and an outer peripheral surface of the ink amount control member and an outer periphery of the ink supply roller. The distance between the outer peripheral surface of the ink reservoir and the outer peripheral surface of the ink reservoir is the same as the distance between the ink amount control member and the ink supply roller.
It is characterized by being arranged so as to be in the range of 0.7 to 1.1.

According to a third aspect of the present invention, there is provided an ink supply apparatus for a printing apparatus, comprising: an ink supply roller rotatably supported around its own central axis between side plates facing each other; and one of the ink supply rollers. Along the generatrix, and an ink amount control member extending and supported between the side plates so as to form a predetermined gap between the ink supply roller and the outer peripheral surface of the ink supply roller, and a part of the ink supply roller and the ink supply member. An ink reservoir provided in cooperation with a part of the ink amount control member and the side plate, and extending between the ink reservoirs along one generatrix of the ink supply roller and supported between the side plates;
An ink driving rod that is rotatable in opposition to the ink supply roller, wherein the ink driving rod is disposed so as to be located at the center with respect to the outer shape of the ink reservoir. I do.

[0012]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view showing a partial configuration of a printing apparatus provided with an ink supply device of the present invention, and FIG.
Is a perspective view showing an ink supply device, and FIG. 3 is a sectional view of the ink supply device.

In the present embodiment, a rotary stencil printing apparatus will be described as an example of a printing apparatus. The stencil printing apparatus has a cylindrical plate cylinder 1 as shown in FIG. Plate cylinder 1
Has two rigid disk-shaped supporting side plates 2 arranged at both ends, and a peripheral wall 3 having ink passage property formed in a cylindrical shape around each of the supporting side plates 2.

The plate cylinder 1 is supported rotatably about its own central axis. At the outer peripheral portion of each support side plate 2, a plate cylinder driving gear portion 2a is formed. When the drive gear 4 connected to the plate cylinder drive motor (not shown) meshes with the plate cylinder drive gear portion 2a, the plate cylinder 1 is moved to an arrow A.
It is driven to rotate in the direction.

The ink supply device of the present invention is disposed inside the cylindrical peripheral wall 3. The ink supply device supplies ink to the inner peripheral surface of the peripheral wall 3, passes the ink through the ink-permeable peripheral wall 3, and makes a stencil sheet (not shown) having a stencil sheet wound around the outer peripheral surface of the peripheral wall 3. Extrude from the perforated plate making part. Then, this ink is used for printing paper (not shown).
Is transferred as an image and printing is performed.

The ink supply device is arranged on a frame 5 supported inside the plate cylinder 1 as shown in FIG. The frame 5 has two side plates 6 facing each other in the axial direction of the plate cylinder 1. Between these side plates 6, ink supply rollers 8,
A doctor roller 9 as an ink amount control member and an ink drive rod 10 are supported.

The ink supply roller 8 has a diameter of, for example, 30 m.
m. As shown in FIG. 3, the ink supply roller 8 has an outer peripheral surface on the lower side in the vertical direction.
Abuts against the inner peripheral surface of the cylindrical peripheral wall 3 which forms The ink supply roller 8 has a main gear 13 provided on a central shaft 12 extending outside the side plate 6 and forming a central axis of the ink supply roller 8. The ink supply roller 8 engages with the intermediate gear 15 in which the main gear 13 meshes with the internal gear 14 shown in FIG. 1 provided on the support side plate 2 forming the plate cylinder 1, and synchronizes with the rotation of the plate cylinder 1. To rotate in the direction of arrow B. In addition, the central shaft 12 is provided with a sub gear 16 which is coaxial with the main gear 13 and rotates with the rotation of the ink supply roller 8.

The doctor roller 9 has a diameter of, for example, 18 mm.
It has a cylindrical shape. The doctor roller 9 has its outer peripheral surface provided at a predetermined interval from the outer peripheral surface of the ink supply roller 8 and is provided in parallel along one generatrix of the ink supply roller 8. The predetermined interval can be appropriately set depending on the viscosity of the ink. For example, at a normal temperature of 23 ° C., the dynamic viscosity due to the rotation of the ink supply roller 8 is about 0.08 mm for ink of 3.0 Pa · s. Is set to

The ink driving rod 10 is formed, for example, as a rod having a diameter of 3 mm. The ink drive rod 10 is provided parallel to and along one generatrix of the ink supply roller 8 near the upper side of the predetermined distance between the ink supply roller 8 and the doctor roller 9. The driven gear 17 is provided at an end of the ink driving rod 10 extending outside the side plate 6. When the driven gear 17 meshes with the auxiliary gear 16 provided on the center axis 12 of the ink supply roller 8, the ink drive rod 10, together with the ink supply roller 8, synchronizes with the ink supply roller 8 in synchronization with the rotation of the plate cylinder 1. To rotate in the direction of arrow C.

As shown in FIG. 1, a distributor 19 is provided inside the plate cylinder 1 and above the ink supply roller 8. Distributor 19
Ink is supplied from the ink storage means 21 via the pump unit 20 according to the ink excess / deficiency signal, and the inside is filled with ink. And distributor 19
Has a plurality of small-diameter holes along one generatrix direction of the ink supply roller 8 on the lower side in the vertical direction, and a predetermined amount of ink is dropped on the ink supply roller 8 as shown in FIG.

The ink dropped from the distributor 19 is stored as an ink swelling portion 22 swelling in an arc shape in a region surrounded by the side plates 6 and the ink supply roller 8 and the doctor roller 9. The ink reservoir 22 is
For example, the ink has a dynamic viscosity of 3.0 Pa · s due to the rotation of the ink supply roller 8 at the normal temperature of 23 ° C., and the arc-shaped outer shape is R4.
5 mm.

The excess or deficiency of the ink amount in the ink reservoir 22 is detected by the ink amount detecting means 23 shown in FIG. The ink amount detecting means 23 is fixed to the frame 5, and is arranged with the ink detecting needle 23 a facing the ink reservoir 22. When the ink detecting needle 23a is in contact with the ink reservoir 22, it is determined that the predetermined amount of ink is satisfied, and the supply of ink from the distributor 19 is stopped.

As shown in FIG. 3, the ink drive rod 10 extends in the ink reservoir 22. The ink reservoir 22 includes the ink supply roller 8 and the ink driving rod 10.
A vortex is generated by the rotation of. The rotational speed of the ink supply roller 8 that generates the vortex is the above-mentioned normal temperature of 23 ° C.
Dynamic viscosity due to rotation of the ink supply roller 8 is 3.0 Pa
S ink, for example, 2 rpm to 150 rpm, and the rotation speed ratio between the ink supply roller 8 and the ink driving rod 10 is preferably, for example, 18:19 to 21.

The ink drive rod 10 is arranged as follows. For example, as described above, the ink supply roller 8 is
Assume that the doctor roller 9 has a diameter of 30 mm, the doctor roller 9 has a diameter of 18 mm, and the outer shape of the ink reservoir 22 is R4.5 mm. In this case, the ink drive rod 10 having a diameter of 3 mm has a distance a between the outer peripheral surface of the ink driving rod 10 and the outer periphery (outer peripheral surface) of the ink reservoir 22 of 3 mm, and a base line passing through the center between the outer peripheral surface of the doctor roller 9 and each other. Is 2.5 mm, the ink supply roller 8
1. The distance c on the base line passing through the centers of the outer peripheral surfaces with each other is 2.
It is arranged to be 5 mm. As described above, the ink driving rod 10 is located at the center with respect to the arc-shaped outer shape of the ink reservoir 22.

The material of the ink supply roller 8, the doctor roller 9, and the ink drive rod 10 may be any material as long as its surface can withstand the solvent and the like contained in the ink. In order to form an ideal vortex, which will be described later, it is preferable that the ink drive rod 10 has a certain degree of hardness.

In the ink supply device constructed as described above, when the ink is consumed and the amount of ink in the ink reservoir 22 decreases and runs short, the signal from the ink amount detecting means 23 causes the pump unit to move from the ink storing means 21 to the pump unit. 20,
Ink is supplied to the ink reservoir 22 via the distributor 19. That is, distributor 1
9 is filled with ink, and the ink is ejected from the small-diameter hole by the pressurization of the pump unit 20. The ejected ink drops on the surface of the ink supply roller 8 immediately below the distributor 19 to form an ink reservoir 22.

A vortex due to the rotation of the ink supply roller 8 and the ink driving rod 10 is given to the ink in the ink reservoir 22, and the fluid increases in the tangential direction of the outer peripheral surface of the doctor roller 9 with which the ink reservoir 22 contacts. This allows
The thickness of the ink reservoir 22 is uniform over the entire area in the axial direction of the ink supply roller 8 and the doctor roller 9 so as to be entangled with the ink drive rod 10.

The ink in the ink reservoir 22 is
The ink is applied to the outer peripheral surface of the ink supply roller 8 while being measured along the axis of the ink supply roller 8 at a predetermined interval between the ink supply roller 8 and the doctor roller 9, and supplied to the inner peripheral surface 3 a of the peripheral wall 3.

As described above, in the ink supply device for supplying ink, the ink driving rod 10 is provided with the distance a from the outer shape of the ink reservoir 22, the distance b from the doctor roller 9, and the distance from the ink supply roller 8. With the arrangement at c, an even flow around the ink drive rod 10 is given to the vortex generated in the ink in the ink reservoir 22.

Further, for example, when the properties of the ink change at a low temperature (10 ° C. or less) and the viscosity increases, the ink in the ink reservoir 22 tends to entangle with the ink drive rod. By arranging the rod 10 in the above-described manner, it is possible to supply a uniform flow around the ink driving rod 10 and supply the ink amount from the predetermined distance between the ink supply roller 8 and the doctor roller 9 without extremely reducing the amount of ink. Becomes possible.

As a result, there is no variation in the ink supply amount in the rotation direction of the ink supply roller 8, the ink supply amount in the axial direction of the ink supply roller 8, or the ink supply amount during one rotation of the plate cylinder 1. The occurrence of image blur can be prevented.

In the case where the viscosity of the ink is increased as described above and the ink tends to become entangled with the ink drive rod, conventionally, the ink reservoir 22 is separated from the ink supply roller 8 and the doctor roller 9 side. However, the above arrangement of the ink drive rod 10
Since an even flow around the ink drive rod 10 is given, separation of the ink reservoir 22 can be prevented.

As a result, the problem that the ink detecting needle 23a of the ink amount detecting means 23 cannot detect the shortage of the ink amount due to the separated ink reservoir portion 22 as in the prior art is eliminated. Supply of ink can be performed.

In addition, even if the properties of the ink change for the purpose of improving the ink performance in the future, the above arrangement of the ink driving rod 10 allows the supply of an appropriate amount of ink for obtaining a desired image. can do.

When the arrangement of the ink driving rods 10 is considered in terms of a ratio, it is assumed that the interval b = the interval c, and the interval a:
It can be inferred that the above effects can be obtained when the ink driving rods 10 are arranged with the interval b (c) in the range of 1: 0.7 to 1.1. That is, the ink driving rod 10 is separated by the distance a,
It is preferable that b and c are arranged so as to be substantially the same.

In the above-described embodiment, the case where the viscosity of the ink increases as an example of the change in the properties of the ink is described.
With the above-described arrangement of the ink driving rods 10, the ink in the ink reservoir 22 is given an even flow around the ink driving rods 10, and the desired image can be obtained from a predetermined distance between the ink supply roller 8 and the doctor roller 9. To supply an appropriate amount of ink for obtaining the ink.

[0037]

As described above, in the ink supply device of the printing apparatus according to the first aspect of the present invention, the distance between the ink driving rod and the outer peripheral surface of the ink driving rod with respect to the outer shape of the ink reservoir, and the amount of ink. The distance between the control member and the outer peripheral surface of the ink supply roller is substantially the same. Further, in the ink supply device of the printing apparatus according to the second aspect of the present invention, the ink driving rod is configured to determine the distance between the outer peripheral surface of the ink driving rod and the outer peripheral surface of the ink supply roller and the outer peripheral surface of the ink supply roller. Placed identically,
In addition, the distance from the outer peripheral surface of the ink reservoir to the outer shape of the ink reservoir is in the range of 1: 0.7 to 1.1 in comparison with the distance between the ink amount control member and the ink supply roller. ing. Further, in the ink supply device of the printing device according to claim 3 of the present invention, the ink driving rod includes:
It is arranged so as to be located at the center with respect to the outer shape of the ink reservoir. Thus, even if the properties of the ink change, the ink in the ink reservoir is given an even flow around the ink drive rod, and a desired image can be obtained from the predetermined interval between the ink supply roller and the ink amount control member. To supply an appropriate amount of ink. Furthermore, even if the properties of the ink change, the ink in the ink reservoir is given an even flow centered on the ink drive rod, and the ink reservoir is entangled with the ink drive rod, and the ink from the ink supply roller and the ink amount control member side. Therefore, it is possible to determine an appropriate amount of ink and supply an appropriate amount of ink.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a partial configuration of a printing apparatus provided with an ink supply device of the present invention.

FIG. 2 is a perspective view showing an ink supply device.

FIG. 3 is a side view of the ink supply device.

FIG. 4A is a side view showing an ink supply device of a conventional printing apparatus. (B) A side view showing a state of the conventional ink supply device when the properties of the ink change.

[Explanation of symbols]

6 ... side plate, 8 ... ink supply roller, 9 ... doctor roller (ink amount control member), 10 ... ink drive rod, 22 ... ink reservoir.

Claims (3)

[Claims] 1. An ink supply roller rotatably supported around its own central axis between opposing side plates, and an outer periphery of the ink supply roller along one generatrix of the ink supply roller. An ink amount control member extending and supported between the side plates so as to form a predetermined gap between the side plate, and a part of the ink supply roller and a part of the ink amount control member and the side plate An ink reservoir provided in cooperation with the ink reservoir, extending between the ink reservoirs along one generatrix of the ink supply roller, supported between the side plates, and rotatable in opposition to the ink supply roller; An ink driving rod, wherein the ink driving rod has a distance from the outer peripheral surface of the ink driving rod relative to an outer shape of the ink reservoir, a distance between the outer peripheral surface of the ink amount control member and the ink supply rod. The ink supply device of the printing apparatus, wherein a distance between the outer peripheral surface of La are arranged to be substantially the same. 2. An ink supply roller rotatably supported around its own central axis between side plates facing each other, and an outer periphery of the ink supply roller along one generatrix of the ink supply roller. An ink amount control member extending and supported between the side plates so as to form a predetermined gap between the side plate, and a part of the ink supply roller and a part of the ink amount control member and the side plate An ink reservoir provided in cooperation with the ink reservoir, extending between the ink reservoirs along one generatrix of the ink supply roller, supported between the side plates, and rotatable in opposition to the ink supply roller; And an ink drive rod, wherein the ink drive rod is arranged such that the distance between the ink drive rod and the outer peripheral surface of the ink amount control member and the outer peripheral surface of the ink supply roller are the same. And the interval for the ink reservoir of the external with respect to the outer peripheral surface of itself, in comparison with the distance between the ink amount control member, and the ink supply roller, 1: 0.7.
An ink supply device for a printing apparatus, wherein the ink supply device is arranged so as to fall within the range of 1. 3. An ink supply roller rotatably supported about its own central axis between side plates facing each other, and an outer periphery of the ink supply roller along one generatrix of the ink supply roller. An ink amount control member extending and supported between the side plates so as to form a predetermined gap between the side plate, and a part of the ink supply roller and a part of the ink amount control member and the side plate An ink reservoir provided in cooperation with the ink reservoir, extending between the ink reservoirs along one generatrix of the ink supply roller, supported between the side plates, and rotatable in opposition to the ink supply roller; And an ink driving rod, wherein the ink driving rod is disposed so as to be located at the center with respect to the outer shape of the ink reservoir.