JPH0775887B2 - Blanket cylinder wiping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for wiping and cleaning a blanket cylinder (abbreviation: blank cylinder) of an offset printing machine.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example of this type of cleaning device. Blanket cylinder 1 of offset printing press
Is a printing paper (shown in the drawing) between the plate cylinder 2 rotating in the direction of arrow c and the printing pattern transferred by rotating in the direction of arrow b while being rotated and rotating in the direction of arrow d. (Omitted) is sandwiched and printed. When the pattern formed on the plate cylinder 2 is changed, and when the blank cylinder is soiled by printing a large number of sheets (for example, 10,000 sheets), the blank cylinder 1 must be washed. In the past, a worker performed the above cleaning using a brush, waste cloth, etc., but it took a lot of time and labor. It depends on the size of the offset printing machine, the type of ink, and the number of colors of the plate, but Kikuban whole paper (Kikuzen for short)
Offset printing machine, it usually took about 10 minutes. Since the operating conditions must be performed several washes in 1 day hibernation machinery during this washing operation is economically large losses. Therefore, conventionally, the illustrated cleaning device 4 has been used. This device feeds the cleaning paper 4a from the rolled cleaning paper 4b, winds the cleaning paper 4a around the air pad 4e, and intermittently winds the cleaning paper 4a at a predetermined pitch by a take-up shaft 4c. It is designed to be pressed against 1. The blanket cylinder 1 is wiped by rotating in the direction of arrow b while pressing the cleaning paper 1. The above-mentioned cleaning paper is made of a material called non-woven fabric, and is called paper in the present invention. The blanket cylinder is wiped from its function, but it is generally called cleaning paper in the prior art. In the embodiments of the present invention described later, they are not named by the action of cleaning or wiping, and are called roll paper depending on their shape. The roll paper 4d shown in FIG.
It is an air cylinder for winding up b. FIG. 6 shows an enlarged sectional view of the vicinity of the cleaning device 4. Cleaning paper 4
The roll a, the roll paper 4b, and the winding shaft 4c are the components described with reference to FIG. A groove-shaped air chamber 4f is provided so as to face the blanket cylinder 1, and an opening thereof is covered with a rubber plate-shaped air pad (shown by a virtual line) 4e '. When pressurized air is sent into the air chamber 4f through the communication hole 4g, the air pad expands as indicated by 4e drawn by a solid line to press the cleaning paper 4a against the blanket cylinder 1. 4h
Is a nozzle for spraying the cleaning liquid.

In the wiping operation, the cleaning liquid is sprayed from the nozzle 4h, the cleaning paper 4a wet with the cleaning liquid is pressed against the rotating blanket cylinder, and the cleaning paper 4a is intermittently fed in the directions of the arrows e ₁ and e _2. After several times, the cleaning paper 4 is further pitch-fed, and the cleaning liquid is not sprayed, and the cleaning paper 4 is wiped up several times with dry cleaning paper to finish. The time required for the work is about 1 minute, which varies depending on the dirt condition of the blanket cylinder, and the consumption amount of the cleaning paper is about 10 times (10 cm) of the pitch feed of 1 cm. The roll paper is rated, has a length of 9 meters, and costs about 3,000 yen. Therefore, when the number of times the blanket cylinder 1 is cleaned is large (several times a day), especially when the number of blanket cylinders 1 that are installed for multicolor printing is large, the consumable cost for this roll paper cannot be ignored.

[0004]

In the conventional cleaning apparatus shown in FIG. 6, (a) the air pad 4e is inflated to press the cleaning paper 4a against the blanket cylinder, and the winding shaft 4c is rotated to rotate the cleaning paper. Since the pitch is fed in the directions of the arrows e ₁ and e ₂ , the winding resistance of the cleaning paper 4a is large. Therefore, as shown in FIG. 5, a large air cylinder 4d is provided. However, since this cleaning device must be installed in a narrow space inside the rotary offset printing press, the large size of the air cylinder 4d is a serious disadvantage.

[0005] (b) for winding over the strong tension in the cleaning sheet 4a which are attached sandwiched in air pad 4e and the blanket cylinder 1 as described above, also deer, the cleaning sheet 4
Since a is wet with the cleaning liquid, the cleaning paper 4a may be broken by tension.

(C) As can be easily understood from FIG. 6, the unused roll paper 4b becomes gradually thinner, and the used cleaning paper (the portion wound around the winding shaft 4c) becomes gradually thicker. Therefore, the rotation angle of the winding drive of the winding shaft 4c is initially large and must be gradually reduced, and it is not easy to feed the cleaning paper at a constant pitch. If the pitch feed is wrong, the cleaning paper is wasted and the cleaning result is deteriorated.

The present invention has been made in view of the above-mentioned circumstances, and the pitch feeding of the roll paper is performed with a light force, an accurate size,
Moreover, it is an object of the present invention to provide a blanket cylinder cleaning device that can be performed with a simple and inexpensive structure.

[0008]

SUMMARY OF THE INVENTION A blanket cylinder wiping device for an offset rotary printing machine according to the present invention, which was created to achieve the above object, has a rotating blanket cylinder that intermittently feeds roll paper. In a device for wiping a blanket cylinder for an offset printing machine, which is a method of pressing against a bar and wiping it, a rod-shaped fixed box (5) which is a stationary member arranged in parallel with the blanket cylinder, and slidable by the fixed box. A movable base (7) supported by the movable base (7), a rubber air tube (8) housed in a space surrounded by the fixed box and the movable base, and fixed to the movable base to face the blanket cylinder. Rubber pad (10)
And air pressure control means for sending pressurized air to the air tube to inflate the air tube or releasing the pressurized air to cause the air tube to recoil, and winding the rubber pad on the surface facing the blanket cylinder. A means for supporting the roll portion of the rolled roll paper in parallel with the blanket cylinder, a means for giving a frictional resistance to the rotation of the roll portion, and winding up the tip of the roll paper which is fed from the roll portion and wound around the rubber pad. The air tube is provided with a wind-up shaft (4c) parallel to the body, a drive means for rotating the wind-up shaft in a fixed direction, and a means for preventing the reverse rotation of the wind-up shaft .
Then, the air tube is sandwiched and is facing the fixed box.
The moving base is pushed and approaches the blanket cylinder (1).
It is designed so that the air tube
When the probe recedes, the moving base is separated from the blanket cylinder.
Equipped with spring (sp) that gives force in the direction of
And when the moving base separates from the blanket cylinder,
Rubber pad (10) fixed to the above moving base
Is separated from the blanket cylinder and the rubber pad is
The roll paper wrapped around the blank is
No longer clamped between the Mupaddo, moving base and inflating the air tube (7) is pushed in the direction approaching the blanket cylinder (1), the mobile along with this
Base fixed Gomupa' de (10) is blanket
Being wrapped around the rubber pad while approaching the torso (1)
Pull out the roll paper from the roll and press the roll paper against the blanket cylinder to perform the wiping action.
So, rubber pad bra and again the air tube is wither
The roll paper that is slackened away from the
Characterized in that it is configured so that wound by loosening amount by said winding shaft (4c).

[0009]

According to the above construction, when the moving base is moved forward and backward by feeding and releasing air into the air tube, the roll paper is automatically pitch-fed in proportion to the forward-backward stroke. , It is sent at a constant pitch regardless of whether the winding part is thick or thin. Moreover, the pitch feeding of the roll paper is performed with a light force because the rubber pad does not press the roll paper against the blanket cylinder. Since it is sent with a light force, there is no risk of breaking the roll paper, and the drive means (for example, an air cylinder) can be small and lightweight, which is inexpensive.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic sectional view showing an embodiment of the present invention and corresponding to FIG. 6 in the conventional example. Reference numeral 5 in the figure is a rod-shaped fixing box fixed to a stationary member of the offset printing machine in parallel with the blanket cylinder 1 with its opening facing the blanket cylinder 1 (in the figure, the longitudinal direction is perpendicular to the paper surface). Is. The above-mentioned rod shape means a straight and elongated shape or a shape similar thereto. The slider 6 is slidably fitted onto the fixed box 5, a moving base 7 is fixed to the slider 6, and is guided in a direction to approach / separate from the blanket cylinder 1. An air tube 8 is housed in a space surrounded by the fixed box 5 and the moving base 7, and a hose 9 is connected to the air tube 8. FIG. 2 is a partially cutaway perspective view of the air tube 8. End plugs 8b and 8c are airtightly fixed and sealed to both ends of the flat rubber tube body 8a. One of the pair of end plugs 8c, 8b, one end plug 8c, is provided with a female screw hole 8d to be screwed into the male screw 9a of the mouthpiece of the hose 9, and the bottom of the female screw hole and the tube body. A hole 8d that communicates with the inside of 8a is provided. FIG. 1A shows a state in which compressed air is not being sent into the air tube 8. Since the air tube 8 is bent, the moving base 7 and the slider 6 are shown.
Is retracted in the direction of being separated from the blanket cylinder 1 by being biased by the tension spring sp, and is separated by the distance dimension L. Reference numeral 11 denotes a pair of guide rollers, which is a blanket cylinder 1
The rubber pads 10 are arranged on both sides of the rubber pad 10 in parallel with and are rotatably supported by the moving base 7. 12
Is a nozzle for injecting the cleaning liquid. The shaft 4c 'supporting the roll paper 4b is lightly braked so as not to overrun, and the winding shaft 4c wound with the used roll paper 4b' rotates in the counterclockwise direction in the figure as indicated by the circular arc arrow. It is provided with a driving means for causing it and a locking means for preventing the reverse rotation. This FIG. 1 is a schematic diagram, and its actual appearance is shown in FIG.
Shown in. Rubber pad 10 and guide roller 1 shown in FIG.
Reference numeral 1 is the constituent member described with reference to FIG. Reference numeral 4c is a take-up shaft, 4c 'is a shaft for supporting roll paper, to which the brake cylinder 17 is fixed and the brake band 18 is provided.
It is lightly braked at. This braking force is weak enough that the roll paper (4b in FIG. 1) attached to the shaft 4c does not overrun or rotate freely. When the air cylinder 16 expands and contracts, the drive arm 15 causes the take-up shaft 4 to move.
It can be reciprocally rotated about c. Of the reciprocating rotations, the rotation in the counterclockwise direction in the figure is the one-way clutch 14.
Is transmitted to the take-up shaft via and the clockwise rotation is made to idle by the one-way clutch 14. The ratchet gear 19 is fixed to the winding shaft 4c, and the ratchet pawl 2
The clockwise rotation is locked by 0. FIG. 4 is an analysis perspective view of the vicinity of this portion. The outer cylinder of the one-way clutch 14 is press-fitted and fixed to the tube shaft 15a of the drive arm 15.
A flange-shaped large-diameter portion 4c ₁ is formed near the tip of the winding shaft 4c, a one-way clutch shaft 4c ₂ is formed on the tip side thereof, and a small-diameter portion for mounting a ratchet gear is concentrically formed at the tip. There is. Reference numeral 22 is a mounting screw for fixing the ratchet gear 21 to the winding shaft 4c, which is a female screw hole 4c ₄
It is screwed into and tightened. Reference numeral 21 shown in FIG. 3 denotes the rubber pad 1.
It is an adjusting bolt of the forward / backward stroke size of the moving base 7 to which 0 is fixed.
The space size (that is, the forward / backward stroke size) shown in FIG.

In the state of FIG. 1 (A), when pressurized air (1.5 kg / cm ^{2 in} this example) is blown into the air tube 8 and inflated, it moves as shown in FIG. 1 (B). The base 7 is pushed and the rubber pad 10 moves forward to push the roll paper 4b against the blanket cylinder 1. When the blanket cylinder 1 is rotated in this state, the blanket cylinder 1 is rotated by the roll paper 4
wiped by b. Next, the operation of the wiping device of this embodiment configured as described above will be described. Figure 1
(A) shows a state in which the wiping work is stopped, and (B) in the figure shows a state during the wiping work. Therefore, the above-mentioned FIG. (A) shows a state where the wiping work preparation is completed and a state where the wiping work is finished. As will be described in detail later, when the apparatus of this example completes one wiping operation, it automatically prepares for the next wiping operation, and the above-mentioned (A) is completed within a short time (about several seconds). Roll paper 4b while repeating the states shown in FIGS.
To perform the wiping and cleaning of the blanket cylinder 1. It is assumed that the preparation is completed as shown in FIG. For convenience of explanation, one point on the roll paper (nonwoven fabric) 4b is named a ₁ and a mark is attached in a thought experiment manner. Here hose 9
From the compressed air into the air tube 8 (1.5kg in this example)
/ Cm ² ), and inflating the air tube 8, it becomes as shown in FIG. Since the fixed box 5 is a stationary member, the movement of the moving base 7 in the direction of approaching the blanket cylinder 1 by the expansion of the air tube 8 (referred to as forward movement) causes the rubber pad 10 to move forward by the dimension L. Then, the roll paper 4b is pressed against the blanket cylinder 1. Since the rubber pad 10 moves forward as described above, tension is applied to the roll paper 4b. However, since the winding shaft 4c is locked in the clockwise rotation (by the ratchets 19 and 20 shown in FIGS. 3 and 4), the unused roll paper 4b supported by the shaft 4c 'is Be withdrawn. When the roll paper is pulled out, the mark a attached in FIG.
₁ progresses to point a _{2 in} FIG.

In this state, the cleaning liquid is jetted from the nozzle 12 to the roll paper to rotate the blanket cylinder 1 for wiping, and the pressurized air in the air tube 8 is discharged, so that the moving base 7 is pulled back by the tension spring sp. To retreat,
(A) Restores the state shown in the figure. Since the roll paper 4b is loosened in accordance with this retreat, the looseness is indicated by an arrow f as shown in FIG.
It is wound by c (by the air cylinder 16 shown in FIG. 3). It is the used roll paper used for the wiping work that is wound up, and as can be easily understood from the figure, the surface of the roll paper that is soiled by sliding on the blanket cylinder 1 is the used roll paper 4b '. It is wound into a form that is wrapped inside the roll. In the figure, s ₁ schematically represents the dirt attached to the roll paper, and the s ₂ surface is the surface on which the above-mentioned dirt is not attached.

Assuming that the roll paper (nonwoven fabric) does not stretch, if the rubber pad 10 moves forward and backward by the dimension L, the point a ₁ changes to the point a ₂ in the process from FIG.
Until it reaches the dimension L, and roll paper is dimension 2 in the direction of arrow g
Only L is withdrawn. Then, in the process of restoring from FIG. 3B to FIG. 3A, the point a ₂ further advances to the point a ₃ by the dimension L,
The used roll paper is rolled up in the direction of arrow f by a dimension of 2L. In the present embodiment, the roll paper is set to be pitch-fed by 10 mm, and assuming that the roll paper does not stretch, the forward / backward stroke L is 1 of the pitch dimension P.
Since it may be adjusted to / 2, L = 10 mm / 2 = 5 mm.

However, since the roll paper (nonwoven fabric) stretches when it is wet with the cleaning liquid, this stretch is adjusted in consideration.
In this example, the forward / backward stroke size is adjusted to 5 mm + α = 6.5 mm. Since the pitch feeding of the roll paper described above is performed without pressing the roll paper against the blanket cylinder 1 with the rubber pad 10, the air cylinder 1 shown in FIG.
6 is a so-called pencil type of small capacity, and the working air pressure is also low (3 kg / cm ^{2 in} this example). Further, since the roll paper is not subjected to a strong tension, there is no fear that the roll paper will be pulled out. Since the pair of guide rollers 11 are provided on both sides of the rubber pad 10 in the apparatus of this example, the roll paper can be fed more smoothly and the used roll paper 4b '
Is wound around the take-up shaft 4c, and the roll formed is aligned and wound without being irregularly wound. Since the pitch feed dimension of the roll paper is determined by the forward and backward strokes of the moving base 7, the control is easy and the roll paper 4b 'can be fed reliably regardless of the increase in the roll diameter.

[0015]

As described above, according to the wiping device of the present invention, the roll paper for wiping the blanket cylinder can be reliably pitch-fed with a light force, and the structure is simple and the manufacturing cost is low. It has an excellent practical effect of
It is a great contribution to the development of the offset printing industry.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a blanket cylinder wiping device according to the present invention.

FIG. 2 is a perspective view showing the air tube in the above embodiment and is partially broken.

FIG. 3 is a side view showing a roll paper winding mechanism and adjusting means in the embodiment.

FIG. 4 is an exploded perspective view of the winding mechanism.

FIG. 5 is a perspective view of a conventional rotary cleaning device mounted on an offset rotary printing press.

FIG. 6 is a cross-sectional view of the above conventional example.

[Explanation of symbols]

1 ... Blanket cylinder of offset printing machine, 2 ... Plate cylinder, 3 ... Impression cylinder, 4 ... Conventional cleaning device, 4
a ... cleaning paper, 4b ... roll paper, 4c ... winding shaft, 4d ... air cylinder, 4e, 4e '... air pad, 4f ... air chamber, 4g ... air communicating hole, 4h ... cleaning liquid nozzle, 5
... fixed box, 6 ... slider, 7 ... moving base, 8 ... air tube, 9 ... hose, 10 rubber pad, 11 ... guide roller, 12 ... cleaning liquid nozzle, 14 ... one way clutch, 16 ... air cylinder, 17 brake cylinder, 18 … Brake band.

Claims (3)

[Claims] 1. A blanket cylinder wiping device for an offset printing machine, wherein the roll paper is intermittently fed out and pressed against a rotating blanket cylinder to wipe the stationary blanket cylinder. A rod-shaped fixed box (5) which is a member, a movable base (7) slidably supported by the fixed box, and a rubber member housed in a space surrounded by the fixed box and the movable base. The air tube (8), the rubber pad (10) fixed to the moving base and facing the blanket cylinder, and sending pressurized air to the air tube to inflate the air tube or release the pressurized air. An air pressure control means for bending the tube and a roll portion of roll paper wound around the surface of the rubber pad facing the blanket cylinder. A means for supporting in parallel with the blanket cylinder and giving frictional resistance to the rotation of the roll part, and a take-up shaft parallel with the blanket cylinder for winding up the tip of the roll paper unwound from the roll part and wrapped around the rubber pad ( 4c), a drive means for rotating the winding shaft in a fixed direction, and a means for preventing the reverse rotation of the winding shaft, and when the air tube expands, the air tube
The moving base facing the fixed box is pushed.
Being able to get closer to the blanket body (1)
When the air tube recedes,
Force is applied in the direction of separating the space from the blanket cylinder.
Spring (sp) that moves when the moving base moves away from the blanket cylinder.
The rubber pad (10) fixed to the moving base is the bra.
And separate it from the blanket cylinder and wind it around the rubber pad.
The rolled paper is a blanket cylinder and a rubber pad
When the air tube is inflated, the moving base (7) is no longer pinched between
There is pushed in the direction approaching the blanket cylinder (1), this
Along with this, a rubber pad (1
0) approaching the blanket cylinder (1),
The roll paper wrapped around the
Et al. Drawer, is pressed against the roll paper to the blanket cylinder
Wiping to perform the action, again the air tube wither rubber pad blanket
The roll paper that is separated from the
A device for wiping a blanket cylinder, which is configured to be wound up by a slack by a winding shaft (4c) . 2. A structure in which the moving base (7) is pushed by the air tube (8) to advance toward a blanket cylinder and retracted by a tension spring (sp). A means for regulating the stroke is provided, and the above-mentioned forward and backward stroke dimension is L, and the feed pitch per roll paper is P, and the above-mentioned dimension L
Is about 1 of the feed pitch P that takes into consideration the roll paper elongation.
2. The blanket cylinder wiping device according to claim 1, wherein the wiping device is set to / 2. 3. A pair of guide rollers (11) positioned on both sides of the rubber pad (10) for guiding the roll paper are arranged in parallel with the blanket cylinder (1) and the winding shaft (4c). The blanket cylinder wiping device according to claim 1, wherein the wiping device is rotatably supported with respect to the moving base (7).