JPH01102569A - Method for tight contact feeding of original for printing of printing machine for direct gravure plate making - Google Patents

Abstract

PURPOSE:To enable the rotation of an original for printing together with a gravure cylinder in the state of surely maintaining the tight contact of the original with said cylinder by exerting the rotating force in the direction reverse from the rotating direction of one press roller by falling of a weight to the other press roller positioned on an upper stream side in the rotating direction of the gravure cylinder. CONSTITUTION:The original 12 for printing imposed in the prescribed position on the peripheral face of the gravure cylinder 10 coated with a photosensitive material is pressed by a pair of the press rollers 14, 16 in the position spaced in a circumferential direction. The one press roller 16 positioned on the down stream side in the rotating direction of the gravure cylinder 10 is rotationally driven at a prescribed speed and the rotating force in the reverse direction is exerted to the other press roller 14 positioned on the upper stream side by falling of the weight 38. The original 12 for printing is rotationally moved together with the gravure cylinder 10 in the state of maintaining the tight contact therewith during the time when the printing is executed in such a manner.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to a printing machine for direct gravure plate making. The present invention relates to a method for closely feeding a printing original for a direct gravure plate-making and printing machine, in which the original for printing is rotated together with a gravure cylinder while remaining in close contact with a predetermined position on the circumferential surface.

(Conventional technology) Conventionally, in a printing machine for direct gravure plate making,
The work of supplying the original for printing to a predetermined position on the circumferential surface of the gravure cylinder, which is already coated with a photosensitive material, and bringing it into close contact requires a large amount of manpower. In this conventional manual feeding and adhesion work of printing manuscripts, the photosensitive material is first applied to a predetermined position on the circumferential surface of the gravure cylinder and a predetermined position on this circumferential surface. Registration marks are written on both one end of the printing document and one end of the original for printing while measuring various lengths using a length measuring instrument such as a ruler. Next, one end of the original for printing is placed on the circumferential surface, and after the index marks of both are aligned, the one end is fixed onto the circumferential surface with an adhesive tape. Next, a small amount of contact liquid is supplied between the gravure cylinder and the original for printing, and is pressed by a free roller or the like over the entire width of the original for printing from one end to the other end, and is applied onto the circumferential surface of the gravure cylinder. Wrapped with adhesive liquid.

Then, light is irradiated onto the gravure cylinder around which the printing original is wrapped at a predetermined position on the circumference, and an image is exposed from the printing original onto the photosensitive material on the circumference of the gravure cylinder, and then the image is printed. The original document is removed from the circumferential surface of the gravure cylinder, and then the gravure cylinder is sent to a photosensitive material development process.

(Problems to be Solved by the Invention) Manual attachment and detachment of printing documents to and from predetermined positions on the circumferential surface of a gravure cylinder is an impediment to cost reduction and productivity improvement of gravure printing.

The inventor of the present application, who is striving to automate the above-mentioned attachment and detachment, has published a patent application titled "Automatic supply method for printing originals onto a gravure cylinder in a printing machine for direct gravure plate making" filed on the same day as the present application. A method has been proposed in which one end of a document is fed onto a gravure cylinder and held tightly on the gravure cylinder.

(Means for solving the problem) This invention was made under the above circumstances, and the purpose of this invention is to completely eliminate the above-mentioned attachment and detachment by combining with the above-mentioned another patent application filed on the same day as the present application. The object of the present invention is to provide a method for closely feeding a printing original for a direct gravure plate-making and printing machine that can be automated, and in particular, according to the above-mentioned separate patent application filed on the same day as the present application, one end of the printing original is placed on a gravure cylinder. After being supplied to the gravure cylinder and held on the gravure cylinder, the printing original is securely brought into close contact with the circumferential surface of the gravure cylinder while the image is printed from the printing original onto the photosensitive material on the circumferential surface of the gravure cylinder. It can be rotated together with the gravure cylinder while
An object of the present invention is to provide a method for closely feeding a printing original for a direct gravure plate making and printing machine.

An object of the present invention as described above is to use a printing machine for direct gravure plate making, in which a printing original placed at a predetermined position on the circumferential surface of a gravure cylinder already coated with a photosensitive material is transferred to a predetermined position on the circumferential surface. This is a method in which the printing original placed at a predetermined position on the circumferential surface of the gravure cylinder, which is already coated with photosensitive material, is rotated together with the gravure cylinder while remaining in close contact with the position of the gravure cylinder. Pressed onto the circumferential surface of the gravure cylinder by a pair of pressure rollers at positions spaced apart in the circumferential direction of the cylinder:
With a pair of pressure rollers pressed onto the circumferential surface of the gravure cylinder, one of the pressure rollers located on the downstream side in the rotation direction of the gravure cylinder is driven to rotate at a predetermined speed. Apply a rotational force in the opposite direction to the rotational direction of one pressure roller to the other pressure roller located on the upstream side by dropping a weight, and force the other pressure roller to resist the rotational force applied by the weight fall. The direct gravure according to the present invention is characterized in that the rotating force of one pressure roller causes the rotary force of one pressure roller to rotate in the same direction as one pressure roller due to the frictional force between the printing document and the gravure cylinder which rotates and moves together with the gravure cylinder. This is achieved by a method of closely feeding originals for printing in a plate-making and printing machine.

(Function) The method for closely feeding a document for printing in a direct gravure plate-making and printing machine according to the present invention, which is characterized by the above-mentioned steps, is as follows:
In a printing machine for direct gravure plate making, a printing document placed at a predetermined position on the circumferential surface of a gravure cylinder already coated with a photosensitive material is placed in close contact with a predetermined position on the circumferential surface. This is a method in which the original for printing is placed at a predetermined position on the circumferential surface of the gravure cylinder, which is already coated with photosensitive material, at a position spaced apart in the circumferential direction of the gravure cylinder. It is pressed onto the circumferential surface of the gravure cylinder by a pair of pressure rows. Next, with the pair of pressure rollers pressed onto the circumferential surface of the gravure cylinder, one of the pressure rollers located on the downstream side in the rotational direction of the gravure cylinder is driven to rotate at a predetermined speed. Apply a rotational force in the opposite direction to the rotational direction of one pressure roller to the other pressure roller located upstream in the rotation direction of the rotation direction, and rotate the other pressure roller by the weight drop. The one pressure roller is rotated in the same direction as the other pressure roller due to the frictional force with the printing document which rotates together with the gravure cylinder due to the rotational force of one pressure roller against the force.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Example) The figure shows a gravure cylinder 10 already coated with a photosensitive material, and the gravure cylinder 10 is rotatably supported in a printing machine for direct gravure plate making. At a predetermined position on the outer peripheral surface of the gravure cylinder 10, a printing original 12 is hung, which is automatically supplied by the above-mentioned printing original automatic feeding method proposed by the inventor of the present invention.

The printing machine presses the printing document 12 hung on the outer circumferential surface of the gravure cylinder 1o over the entire width of the outer circumferential surface of the gravure cylinder 1o at two positions spaced apart in the circumferential direction of the gravure cylinder 10. It is equipped with a pair of pressure rollers 14 and 16 and a printing light source means 18 located between them, and the center line of rotation of each of the pair of pressure rollers 14 and 16 is the gravure roller. The cylinder 10 is arranged parallel to the center line of rotation, and the material constituting the outer peripheral surface that comes into direct contact with the printing original 12 is used to prevent damage to the printing original 12. It is made of rubber or a synthetic resin having elasticity similar to rubber in order to obtain a reliable frictional engagement with the printing original 12 necessary to reliably drive the printing document 12.

A pair of pressure rollers 14 and 16 and a light source means 1 for printing
8 is provided in the printing machine so as to be movable in the vertical direction, and a pair of pressure rollers 14 are installed at the lower end position.
．． As shown in the figure, the printing original 12 hung on the outer peripheral surface of the gravure cylinder 10 is pressed with the help of a biasing means such as a spring or an air cylinder (not shown), and the printing light source means 18 is a light transmitting slit at the lower end. 20 close to the positive film 12 between a pair of pressure rollers 14.16, and a pair of pressure rollers 14.1 at the lower end position.
6 is separated from the printing original 12 hung on the outer peripheral surface of the gravure cylinder 10, as shown in the figure, and the printing light source means 18 connects the light transmitting slit 20 at the lower end between the pair of pressure rollers 14 and 16. Keep it away from the printing original 12.

An output shaft of a first driving electric motor 24 is connected to one end of the pressure roller 16 disposed on the right side in the figure via a non-slip power transmission means 22 such as a chain or a toothed belt.

A pulley 28 is connected to the end opposite to the first drive motor 24 through a one-way clutch 26, of both ends of the pressure roller 14 located on the left side in the figure.

One end of a wire 30 is wound around the pulley 28, and the other end of the wire 30 is connected to a second driving electric motor 32, which is equipped with a speed reducer and a brake and is fixed to the above-mentioned baking machine.
is wound around the larger pulley of a stepped pulley 36 connected to the output shaft of the motor via a one-way clutch 34.

Note that the direction in which the wire 30 extends from the pulley 28 to the larger pulley of the stepped pulley 36 is parallel to the tangent that passes through the contact point of the left pressure roller 14 with respect to the outer peripheral surface of the gravure cylinder 1o. The other end of a wire 40 having a weight 38 detachably attached to one end is wound around the smaller pulley of the stepped pulley 36.

In the printing machine configured as described above, the front end (the right end in the figure) of the printing original 1112 is attached to the outer periphery of the gravure cylinder 10 by the "printing original automatic feeding method" proposed by the inventor of the present application. Until the upper part of the surface is supplied, the pair of pressure rollers 14 and 16 and the printing light source means 18 are arranged at the upper end position, and the weight 3
8 is placed at the lower end position. As a result, the wire 30 has only one end fixed to the outer peripheral surface of the pulley 28 and is not wound around the outer peripheral surface of the pulley 28 at all, and even the lower end of the smaller stepped pulley 36 is attached to the weight 38. The upper end of the fixed wire 40 is only fixed to the outer circumferential surface of the smaller pulley and is not wound around the outer circumferential surface of the smaller pulley at all. Wire 40. Stepped pulley 36. and wire 3
The load of the weight 38 transmitted to the pulley 28 via 0 is
A rotational force is applied to the pulley 28 in the clockwise direction, and this rotational force is further transmitted to the pressure roller 14 on the left side via the one-way clutch 26, and as a result, the rotational force causes the pressure roller 14 to rotate in the clockwise direction. Try to rotate. However, this rotation occurs when one end of the wire 30 is connected to the pulley 28.
This does not actually occur because it is only fixed to the outer peripheral surface of the pulley 28 and is not wound around the outer peripheral surface of the pulley 28 at all.

A pair of pressure rollers 14 and 16 and a light source means 1 for printing
When 8 descends from the upper end position and reaches the lower end position, 1
The pair of pressure rows 514 and 16 abut against the front end of the printing original 12 that is being supplied to the upper part of the outer peripheral surface of the gravure cylinder 10, as shown in the figure. At this time, the wire 3 between the pulley 28 and the larger pulley of the stepped pulley 36
Since the extending direction of 0 is the tangential direction as described above, the weight 38
The tensile force applied to the wire 30 by
No force is applied to the left pressure roller 14 that would cause it to separate from the printing document 12 or insert it into the printing document 12.

When the pressure roller 16 on the right side is driven by the first drive electric motor 24 to rotate at a constant speed in the counterclockwise direction as shown by arrow A, the printing document is 12, a tensile force in the clockwise direction indicated by arrow B is transmitted. “The first drive motor 24 is
The clockwise pulling force transmitted from the weight to the printing original 12 is greater than the counterclockwise pulling force transmitted from the weight 38 to the printing original 12 via the pressure roller 16 on the left side. Since it is large, the printing original 12 rotates together with the gravure cylinder 10 in the clockwise direction indicated by arrow B at a predetermined speed. At this time, a pair of pressure rollers 14.
Between 16 and 16, a counterclockwise tensile force transmitted from the weight 38 to the printing original 12 through the pressure roller 16 on the left side is acting on the printing original 12. It comes into close contact with the outer peripheral surface of the gravure cylinder 10.

The rotational movement of the printing document 12 in the clockwise direction shown by arrow B causes the left pressure roller 16 to rotate in the counterclockwise direction shown by arrow C. The rotation is performed by the pulley 2 via the one-way clutch 26.
8, which in turn causes winding of the wire 30 from the outer circumferential surface of the larger pulley of the stepped pulley 36 onto the outer circumferential surface of the pulley 28, and as a result, the stepped pulley 36 has a reverse direction indicated by an arrow. Causes rotation in a clockwise direction. This rotation of the stepped pulley 36 causes the wire 40 to wind up onto the outer circumferential surface of the smaller boob of the stepped pulley 36, causing the weight 38 to be pulled up at a predetermined speed.

While the printing original 12 and the gravure cylinder 10 are rotating at a constant speed in the clockwise direction indicated by arrow B due to the rotational force applied to the right pressure roller 16 from the first drive motor 24, Light is irradiated from the light transmission slit 20 of the printing moonlight source device M18 toward the printing original 12 between the pair of pressure rollers 14 and 16, and the printing original 1
An image is printed onto the photosensitive material coated on the outer peripheral surface of the gravure cylinder 10. 1 pair of pressure rollers 1
Between 4.16 and 4.16, as described above, the printing original 12 is firmly in close contact with the outer peripheral surface of the gravure cylinder 10, so that no blurring occurs during image printing.

Pressure roller 1 on the right side from the first driving 'FivJ machine 24
Rotation of the printing original 12 and the gravure cylinder 10 at a constant speed in the clockwise direction shown by the arrow B due to the rotational force applied to the printing original 12 causes all the images in the printing original 12 to be transferred to the gravure cylinder 1o. The printing attack on the photosensitive material on the outer circumferential surface continues, and eventually the rear end (the left end in the figure) of the printing original 12 in the moving direction touches the pressure roller 14 on the left side. After successively passing under the pressure roller 16 on the right side, it falls from above the gravure cylinder 10.

At this time, the rear end (the left end in the figure) of the printing original 12 in the moving direction passes just before it finishes passing the left pressure roller 14 or passes under the right pressure roller 16. Immediately before finishing, the pair of pressure rollers 14, 16 and the printing light source means 18 are raised to the above-mentioned upper end position, and the printing original 12 is moved to the gravure cylinder 1o.
It can also be removed without dropping it from above.

When the rear end (the left end in the figure) of the printing original 12 in the moving direction separates from under the left pressure roller 14, or the pair of pressure rows 514.16 and the printing light source means 18 When the pressure roller 14 begins to rise to the above-mentioned upper end position, the rotational force in the counterclockwise direction indicated by the arrow C no longer acts on the pressure roller 14, so that the pulley 28. Wire 30. And the tensile force that was being applied to the wire 40 via the stepped pulley 36 to lift the weight 38 no longer acts, and as a result the weight 38 begins to fall.

The fall of the weight 38 causes the stepped pulley 36 to rotate clockwise, and this rotation is transmitted to the output shaft of the second drive motor 32 via the one-way clutch 34.

As soon as the rotation is transmitted to the output shaft of the second drive motor 32, a predetermined current of a small value is supplied to the second drive motor 32, and the above-mentioned current added to the second drive motor 32 is supplied. Apply decelerator and brake. As a result, the rotation of the stepped pulley 36 in the clockwise direction due to the drop of the weight 38 is slowed down, the stepped pulley 36 slowly rotates clockwise, the weight 38 also falls slowly, and the pulley 28 and The left pressure roller 14 also rotates slowly.

Further, in this embodiment, as described above, the printing original 12
In order to remove the image from the top of the gravure cylinder 10 without causing it to fall, the pair of pressure rollers 14 and 16 and the printing light source means 18 are moved immediately before they start to rise toward the upper end position, or in the direction of movement of the printing original 12. The rear end (
In the figure, the left pressure roller 14 is directly separated from the bottom of the left pressure roller 14, and at the moment when the weight 38 starts to descend together with the pulley 28, the brake of the second driving electric motor 24 is applied. A pair of pressure rollers 14
．． 16 is separated from the gravure cylinder 1o, or after the rear end (the left end in the figure) of the printing document 12 in the moving direction is separated from under the left pressurizing roller 14. The lowering can also prevent the pulley 28 and the left pressure roller 14 from rotating freely.

In this case, once the free rotation of the pulley 28 and the left pressure roller 14 due to the lowering of the weight 38 is prevented by the action of the brake, the action of the brake is stopped and at the same time the second driving electric motor The above-mentioned speed reducer added to 32 is activated.

As a result, even if the weight 38 falls, the clockwise rotation of the stepped pulley 36 is decelerated due to the weight 38 falling.The C1 stepped pulley 36 slowly rotates clockwise, and the weight 38 also slows down. The pulley 28 and the left pressure roller 14 also slowly rotate.

When the rear end (the left end in the figure) of the printing original 12 in the moving direction is separated from under the right pressure roller 16, or when the pair of pressure rollers 14 and 16 and the printing light source 18 When the pressure roller 16 is raised toward the upper end position, the rotation of the output shaft of the first drive electric motor 24 is stopped, and the rotation of the pressure roller 16 is also stopped.

The slow rotation of the left pressure roller 14 and the stepped pulley 36 in the clockwise direction as described above is caused by the weight 38
The process ends when it reaches the lower end position mentioned above.

In the embodiment described above, a plurality of weights 3 of various weights are used.
Prepare a weight 38 and attach it to the lower end of the wire 40.
By selecting a pair of pressure rollers 14.16
The magnitude of the pack tension applied to the printing original 12 between the printing plates 12 and 12 for adhesion can be varied in various ways depending on the material and type of the printing plate 112.

The back tension load on the printing original 12 using the weight 38 can be applied to the printing original 12 by connecting a mechanical or electric brake device to the pressure roller 14 on the left side.
Compared to the case where the back tension is applied, the variation in the pack tension load is extremely small even though the rotational speed of the gravure cylinder 10 is extremely slow, and the magnitude of the back tension can be precisely controlled. .

(Effects of the Invention) As described in detail above, the method of closely feeding a document for printing in a direct gravure plate-making and printing machine according to the present invention is applicable to a direct gravure plate-making and printing machine in which the periphery of a gravure cylinder already coated with a photosensitive material is used. tI! at a predetermined position on the surface. , a method in which a placed original for printing is rotated together with a gravure cylinder while remaining in close contact with a predetermined position on the circumferential surface of the gravure cylinder; The original for printing placed in a predetermined position is placed in the circumferential direction of the gravure cylinder! 1l
At the ilL, position, press onto the circumferential surface of the gravure cylinder with a pair of pressure rollers; with the pair of pressure rollers pressed onto the circumferential surface of the gravure cylinder, One pressure roller located on the downstream side is rotated at a predetermined speed, and the other pressure roller located on the upstream side in the rotation direction of the gravure cylinder is driven in the opposite direction to the rotation direction of one pressure roller. A printing original is rotated along with a gravure cylinder by the rotational force of one pressurizing roller against the rotational force applied by the falling weight, and the other pressure roller is rotated against the rotational force applied by the falling weight. Rotates in the same direction as one pressure roller due to the frictional force of the present application. By combining this with the ``automatic document supply method for original documents,'' it is possible to completely automate the removal of the positive film from a predetermined position on the circumferential surface of the gravure cylinder. According to the patent application, after one end of the original for printing is supplied onto a gravure cylinder and held on the gravure cylinder, the image is printed from the original for printing onto the photosensitive material on the circumferential surface of the gravure cylinder. The original document can be rotated together with the gravure cylinder in a state in which it is securely brought into close contact with the circumferential surface of the gravure cylinder.

[Brief explanation of the drawing]

The figure shows a printing original in a direct gravure plate-making and printing machine being rotated and moved together with the gravure cylinder in a state in which the printing original is in close contact with the outer peripheral surface of the gravure cylinder according to an embodiment of the method of closely feeding the printing original in the direct gravure plate-making and printing machine of the present invention. FIG. 2 is a perspective view schematically showing the situation. 10... Gravure cylinder, 12... Original for printing,
14.16... Pressure roller, 18... Light source means for baking, 20... Light transmission slit, 22... Non-slip power transmission means, 24... First drive electric motor,
26...One-way clutch, 28...Pulley,
30... Wire, 32... Second driving electric motor,
34... One-way clutch, 36... Stepped pulley, 38... Weight, 40... Wire. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] In a printing machine for direct gravure plate making, a printing document placed at a predetermined position on the circumferential surface of a gravure cylinder already coated with a photosensitive material is placed in close contact with a predetermined position on the circumferential surface. A printing document placed at a predetermined position on the circumferential surface of a gravure cylinder, which is already coated with a photosensitive material, is rotated along with the gravure cylinder while the printing document is placed at a position spaced apart in the circumferential direction of the gravure cylinder. A pair of pressure rollers presses onto the circumferential surface of the gravure cylinder; while the pair of pressure rollers presses onto the circumferential surface of the gravure cylinder, pressure is applied to one of the rollers located on the downstream side in the rotational direction of the gravure cylinder. While driving the roller to rotate at a predetermined speed, applying a rotational force in the opposite direction to the rotation direction of one pressure roller to the other pressure roller located upstream in the rotation direction of the gravure cylinder by dropping a weight, The rotational force of one pressure roller causes the other pressure roller to move in the same direction as the one pressure roller due to the frictional force with the printing document which rotates along with the gravure cylinder against the rotational force given by the falling weight. A method for closely feeding a printing original for a direct gravure plate making and printing machine, which is characterized by: rotating;