JPH036909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for printing rollers that are rotatably arranged in parallel and urged toward each other by urging means. For example, the present invention relates to a double-sided printing device that simultaneously prints both sides of a printing medium by conveying the printing medium through a printing medium such as a vehicle hose.

(Prior Art) Conventionally, as a device for printing both sides of a printing material, for example, a hose for a vehicle, the device described in Japanese Patent Application Laid-open No. 78418/1983 is known.

This device consists of two devices, each of which is rotatably installed in parallel.
A biasing means is connected to each of the two printing rollers so that they approach each other, a vehicle hose is inserted between these two printing rollers, and predetermined printing is applied to both sides of the vehicle hose. It was hot.

(Problems to be Solved by the Invention) However, in conventional double-sided printing devices, the two printing rollers are always urged to approach each other, and when replacing a printing medium such as a vehicle hose, When the printing material disappears from between the printing rollers, the respective urging means
The printing rollers may come into contact with each other and damage the printing surfaces of the printing rollers.

Therefore, in the conventional apparatus, it is necessary to loosen the urging force of each urging means so that the printing rollers do not come into contact with each other.

However, when printing by inserting the printing material between the printing rollers again, if the urging force of each urging means is loosened, the two printing rollers apply the same pressure to both sides of the printing material. In order to print neatly by pressing, it is necessary to readjust the respective biasing forces, which is time-consuming.

This invention solves the above-mentioned problems, and is capable of preventing two printing rollers from coming into contact and being damaged when replacing the printing material, and printing the printing material neatly without any trouble after replacement. The purpose of the present invention is to provide a double-sided printing device that can perform double-sided printing.

(Means for Solving the Problems) The double-sided printing device according to the present invention has two printing rollers that are rotatably arranged side by side and biased toward each other by biasing means.
A double-sided printing device that simultaneously prints both sides of the printing material by conveying the printing material, wherein the two printing rollers are connected to support rods that respectively hold the printing rollers, and each of the support rods are connected to rotating shafts that rotate the same distance in opposite directions through gears that mesh with each other on the base side, and each of the rotating shafts has a support rod and a supporting rod that face each other. Adjustment rods protruding in substantially opposite directions are connected, and between the two adjustment rods, screw portions threaded in mutually opposite directions are provided at both ends, and each of the screw portions is inserted into the adjustment rod. Adjustment screws are disposed on opposite surfaces of the two adjustment rods, each of which is screwed into a threaded portion of the adjustment screw to allow the adjustment rods to approach each other. In the present invention, a slider is brought into contact with which the adjustment rods regulate the mutual separation distance by adjusting the adjustment screw.

(Operations and Effects of the Invention) In the double-sided printing apparatus according to the present invention, when replacing the printing medium, first, the adjusting screw is turned in a predetermined direction.
Then, the threaded parts at both ends of the adjustment screw, which are threaded in mutually opposite directions, rotate accordingly, and are threadedly engaged with each threaded part and come into contact with the surfaces opposite to the mutually facing surfaces of each adjustment rod. The sliders on the slider move closer to each other, and the adjustment rods move closer to each other. Since each rotary shaft from which each adjustment rod protrudes rotates at the same angle via mutually meshing gears, two
The two printing rollers are separated by resisting the urging force of the urging means without shifting the center position between the two printing rollers.

Then, in this state, the printing material is replaced. At this time, the center of the new printing material in the conveyance direction is placed at the center between the two printing rollers.

Then, after replacing the printing material, turn the adjustment screw in the opposite direction to that described above. Then, the sliders are separated from each other via the threaded portion of the adjustment screw, and the adjustment rods are separated from each other. Since each rotating shaft that makes each adjusting rod protrude rotates at the same angle via mutually meshing gears, the two printing rollers are connected to the center between the two printing rollers via the support rod. Without shifting its position, it approaches by the urging force of the urging means and is pressed against both sides of the new printing medium with the same pressure.

After that, when the printing material is conveyed, the two printing rollers on both sides of the printing material press it with the same pressure and print neatly.

Therefore, in the double-sided printing device according to the present invention, when replacing the printing material, the two printing rollers can be separated from each other by adjusting the adjustment screw, so that damage to the two printing rollers can be prevented. Furthermore, after replacing the printing material, the two printing rollers can be pressed with the same pressure on both sides of the printing material by adjusting only one adjustment screw, so that the printing material can be neatly printed without taking much time.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The double-sided printing device 10 of the embodiment performs predetermined printing on both horizontal sides of a vehicle hose 1 that is horizontally conveyed from a hose reel (not shown) by a take-off machine or the like, and is configured to perform predetermined printing on both horizontal sides of a vehicle hose 1 in the conveying direction of the vehicle hose 1. Printing rollers 12 and 13 for gravure printing, which are provided with rotating shafts perpendicular to the conveyance direction of the vehicle hose 1 at positions equidistant from the center (axis center of the vehicle hose 1).
is installed.

These printing rollers 12 and 13 are rotatably held via bearings or the like at the ends of support rods 14 and 15 having the same length, respectively.

The support rods 14 and 15 are opened at the same angle with respect to the conveyance direction of the vehicle hose 1, and each has a rotation shaft 16 rotatably disposed on the base side with respect to the frame 11. , 17 fixed part 16
a, 17a, and each support rod 1
4 and 15, the printing roller 1
2, 13 Doctor blade 18, 1 in contact with the circumferential surface
9 are fixed, and the mutual printing rollers 1
A spring 20 is connected to the springs 20 and 13 to urge them to narrow.

Gears 21 and 22 that mesh with each other are fixed to the rotating shafts 16 and 17, respectively, and fixed portions 16a and 17a of the shafts 16 and 17 have
Adjustment rods 2 protrude in a direction substantially opposite to the support rods 14 and 15 at positions substantially opposite to the support rods 14 and 15, respectively.
3 and 24 are provided protrudingly.

Approximately semicircular sliders 25 and 26 are slidably fitted into the adjusting rods 23 and 24, respectively, so as to abut on the opposite surfaces of the opposing surfaces, and The children 25 and 26 have knobs 27a.
One adjusting screw 27 threaded in opposite directions is screwed into the threaded portions 27b and 27c on both sides of the holder. Therefore, the support rods 14, 15 are supported by the springs 20
Although both of them are always urged in the direction of narrowing by the urging force of As a result, the support rods 14 and 15 are prevented from coming closer than a predetermined distance, and as a result, the two printing rollers 12 and 13 are also prevented from coming closer than a predetermined distance.

Tanks 29 are also provided on the circumferential surfaces of the printing rollers 12 and 13, near the front side of the doctor blades 18 and 19 in the direction in which these rollers 12 and 13 rotate as the vehicle hose 1 moves.
An ink supply nozzle 28 is provided with an adjustment valve 28a so that a predetermined amount of ink can be applied to the circumferential surfaces of the rollers 12 and 13 (see FIG. 3).

The tank 29 is provided with an ink stirring screw therein, and is filled with pressurized air through a pressurized air pipe 30, so that ink can be supplied from the tank 29 at a constant pressure. Further, the frame body 32 holding the tank 29 is connected to the frame 31.
Further, the connecting portion 33 between the ink supply nozzle 28 and the tank 29 is configured to be rotatable, so that the position of the ink supply nozzle 28 can be adjusted.

Note that 34 is a support rod 1, taking into consideration that ink may drip from the peripheral surfaces of the printing rollers 12 and 13.
This is the saucer provided at 4 and 15.

Next, the manner of use of the double-sided printing apparatus 10 of this embodiment will be explained.

First, confirm that the center of the conveyance direction of the vehicle hose 1, which is the printing material, is aligned with the center of the space between the printing rollers 12 and 13, and then adjust the adjustment screw 2.
7 to adjust the gap between the printing rollers 12 and 13 so that printing can be performed even on the smallest diameter portion of the vehicle hose 1. In this case, in the device of the embodiment, by adjusting one adjustment screw 27, the adjustment rod 2
3, 24, gears 21, 22, rotation shafts 16, 17, and support rods 14, 15 to print roller 12,
13 can be easily adjusted without changing the center of both, and the gap between the printing rollers 12 and 13 can be easily adjusted.

Then, the vehicle hose 1 is connected to the printing roller 12,
13, and apply a predetermined amount of ink from the ink supply nozzle 28 to the circumferential surfaces of the printing rollers 12 and 13 without dripping,
As the printing roller 1 moves, each printing roller 1
2 and 13 rotate, the ink is scraped off by the doctor blades 18 and 19, and the printing rollers 12 and
Predetermined printing recesses on the circumferential surface 13 are filled with ink, and these printing recesses contact both horizontal side surfaces of the vehicle hose 1, allowing predetermined gravure printing to be performed on both surfaces of the vehicle hose 1. At that time, even if the outer diameter of the vehicle hose 1 changes, such as increasing or decreasing, the printing roller 12,
Support rods 14, 15 holding 13 respectively
However, while receiving the biasing force of the spring 20, the rotation shafts 16,1
7. Since the gears 21 and 22 rotate the same distance in opposite directions, the printing rollers 12 and 13 always align their centers with the center of the vehicle hose 1 being conveyed, and By matching the outer diameter of the vehicle hose 1 and contacting both sides of the vehicle hose 1 with the same pressure, it is possible to neatly print on both sides of the vehicle hose 1 (see Figure 5). ).

When replacing the vehicle hose 1 to be printed, first turn the adjustment screw 27 in a predetermined direction. Then, the threaded portions 27b and 27c, which are threaded in mutually opposite directions at both ends of the adjusting screw 27, rotate accordingly, and are threadedly engaged with the threaded portions 27b and 27c, and the threaded portions 27b and 27c of the adjusting rods 23 and 24 are threaded in opposite directions. Sliders 25 and 26 that are in contact with the opposite side of the surface
are approaching each other, and the adjusting rods 23 and 24 are approaching each other. The rotating shafts 16 and 17 from which the adjusting rods 23 and 24 protrude are connected to gears 2 that mesh with each other.
1 and 22, the support rod 1
Two printing rollers 12, 13 via 4, 15
However, the two printing rollers 12 and 13 are separated from each other against the biasing force of the spring 20 without shifting the center position between them.

Then, in this state, the vehicle hose 1 is replaced. At this time, the center of the new vehicle hose 1 in the conveyance direction is arranged at the center between the two printing rollers 12 and 13.

After replacing the vehicle hose 1, turn the adjustment screw 27 in the opposite direction to that described above. Then, the slider 2
6 and 26 are spaced apart from each other, and adjustment rods 23 and 24 are spaced apart from each other. Since the rotating shafts 16 and 17 from which the adjusting rods 23 and 24 project are rotated by the same angle through the gears 21 and 22 that mesh with each other,
Two printing rollers 1 via support rods 14, 15
2 and 13 are brought closer to each other by the biasing force of the spring 20 without shifting the center position between the two printing rollers 12 and 13, and are pressed against both surfaces of the new vehicle hose 1 with the same pressure.

After that, when the vehicle hose 1 is conveyed, the two printing rollers 12 and 13 press the same pressure on both sides of the hose 1 and print neatly. It has a similar effect.

In the embodiment, the spring 20, which serves as a biasing means for narrowing the printing rollers 12 and 13, is attached to the support rod 14,
Of course, this urging means is provided between the adjusting rods 23, 24.
are arranged so that they are separated from each other, or
A support rod 1 is attached to one or both of the rotation shafts 16 and 17.
4 and 15 may be twisted in the direction to narrow them.

Further, in the embodiment, the direction in which the printing material is conveyed is shown as being horizontal, but of course, the direction in which the printing material is transported may be in the vertical direction as long as a printing roller is provided. However, it is not limited to the one for gravure as in the embodiment, but may be for offset.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a double-sided printing apparatus showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, FIG. 3 is a side view of the embodiment, and FIG. FIG. 3 is a plan view showing a state in which the gap between the printing rollers has changed. 1... (Printed material) Vehicle hose, 10... Double-sided printing device, 12, 13... Printing roller, 1
4, 15... Support rod, 16, 17... Rotating shaft, 2
0... Spring, 21, 22... Gear, 23, 24...
...Adjustment rod, 25, 26...Slider, 27...Adjustment screw, 27b, 27c...Threaded portion.

Claims (1)

[Scope of Claims] 1. Both sides of the printing material are conveyed between printing rollers that are rotatably arranged in parallel and urged toward each other by urging means. A double-sided printing device that simultaneously prints, wherein the two printing rollers are connected to support rods that respectively hold the printing rollers, and each of the support rods has gears that mesh with each other on the base side. are connected to rotating shafts that are interlocked so as to rotate the same distance in opposite directions, and each of the rotating shafts is connected to adjustment rods that face each other and protrude in substantially opposite directions to the support rods, An adjusting screw is disposed between the two adjusting rods, the adjusting screw having threaded portions at both ends threaded in opposite directions, each threaded portion being inserted into the adjusting rod, respectively. The surfaces on the opposite side of the mutually opposing surfaces of are respectively threadedly engaged with the threaded portions of the adjustment screws, and the adjustment rods are adjusted by adjusting the adjustment screws in a state where the adjustment rods can approach each other. A double-sided printing device characterized in that a slider is brought into contact with the rods to regulate the distance between them.