JPH0333114B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a printing device for attaching an index for identifying the type of cathode ray tubes in which a mixture of different types flows in a production line for cathode ray tubes, for example.

[Technical background of the invention and its problems]

In one production line, for example, in an automatic production line where indicators are attached to each cathode ray tube flowing on a conveyor, and processing is performed based on the indicators in the subsequent process, clear, easy-to-read indicators are placed at predetermined positions on the cathode ray tubes. There is a need.

Therefore, conventionally, printing devices (marking devices) are often used as means for attaching this type of index. In this printing device, stamps made of rubber stamps with numbers from 0 to 9 are arranged side by side, and ink is applied to the stamps to print on the printing area of the cathode ray tube. However, as the number of types of cathode ray tubes increases, the index becomes complicated, and when indexing by number, it is necessary to use a large number of digits. For example, when printing a 12-digit number as an index, 12 stamps are placed side by side and printed at once, but the number needs to be changed randomly each time, and when the printing area is small, It is necessary to place the seals close together accordingly.

Therefore, the stamp, or number, naturally becomes smaller, making it difficult to expect clear printing, and as the number of digits increases, it becomes difficult to select the characters.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to make it possible to print multiple digits without placing stamps close together even if the printing area of the printing material is narrow. Another object of the present invention is to provide a printing device that allows easy selection of characters.

[Summary of the invention]

In order to achieve the above object, the present invention arranges a plurality of character wheels spaced apart from each other, and by rotating these character wheels independently, an arbitrary stamp can be selected, and the character wheels can be rotated independently. It is made to advance and retreat from the printing area while reciprocating in the width direction of the printing area of the printing material, making it possible to print a large number of digits in the printing area.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 shows a schematic configuration of the entire printing device. 1 is a printing material such as a cathode ray tube, which is intermittently conveyed on a production line 2 and temporarily stopped at a printing station 3. It's summery. A printing area 4 is provided on a part of the printing material 1 in which an index for identifying the product type, for example, a multi-digit number is printed. Reference numeral 5 denotes a wheel drive mechanism, which is composed of an XY table 6, and the XY table 6 is provided with a plurality of wheels 7, 8, two wheels in this embodiment.
The character wheels 7 and 8 are configured to move in the width direction of the printing area 4 when the XY table 6 is driven in the X direction, and move forward and backward with respect to the printing area 4 when driving in the Y direction. has been done. Further, each of the character wheels 7 and 8 is provided with a character selection mechanism 9 and 10 that rotates the character wheels independently. Also, the above XY
At the bottom of the table 6 and the character wheels 7 and 8 are the character wheels 7,
an ink transfer mechanism 11 that transfers ink to 8;
is provided.

Each mechanism constituting the printing device is constructed as follows.

First, the wheel drive mechanism 5 will be described in detail based on FIG. 2. Reference numeral 21 is a Y table of the XY table 6, and this is configured to be movable in the direction of arrow Y by Y axis guides 22, 22. . X-axis guides 23, 23 are provided on this Y-table 21, and these X-axis guides 23, 23 are provided with
4 is provided movably in the direction of arrow X. The Y-table 21 is driven by a Y-axis screw 26 directly connected to a Y-axis pulse motor 25.
The X-table 24 is driven by an X-axis screw 28 directly connected to an X-axis pulse motor 27. Therefore, the above X table 24 is
It is adapted to move in the XY directions, and a wheel attachment portion 29 is provided at the front end.

As shown in FIGS. 3 and 4, character wheels 7 and 8 and character selection mechanisms 9 and 10 are attached to this character wheel attachment portion 29. As shown in FIGS. That is, 31
is a support frame, and rotating shafts 32 and 33 provided concentrically with each other are supported on this support frame 31 via bearings 34 and 36. And these rotating shafts 3
The inner ends of the shafts 2 and 33 are rotatably supported by a common bearing 36, and gears 37 and 38 are fitted to the outer ends. Furthermore, these gears 37, 38 are connected to the character wheel pulse motor 39, which constitutes the character selection mechanisms 9, 10.
40 gears 41 and 42, and the rotating shaft 3
2 and 33 are adapted to be rotated independently. Wheels 7 and 8 are fitted onto these rotating shafts 32 and 33, respectively.

These character wheels 7 and 8 have the same structure and are constructed as shown in FIG. 5. That is, 43 is a ring body formed in the shape of a disk, and for example, twelve guide holes 44 are bored radially from the center thereof at equal intervals. And these guide holes 44...
A stamp mount 45 is inserted into the holder 45 so as to be freely protrusive and retractable in the radial direction. A stroke regulating hole 47 into which a stopper pin 46 is loosely fitted is bored in the longitudinally intermediate portion of the stamp mount 45, and a spring 48 is provided at the bottom of the guide hole 44 to bias the stamp mount 45 in the projecting direction. It is stored. A rubber tube 4 is attached to the outer end surface of each stamp mount 45 installed in this way.
A stamp 50 is integrally attached via 9. Here, in detail about the spring 48, repulsive force (Fs) = 100g, spring coefficient (Fk) = 36
g/mm is used, and the acting force F=Fs+(Fk×l)
is set to . (However, l is the distance moved) Also,
The rubber base 49 has a soft base 49a (approximately 20 degrees) so that it deforms slightly due to printing pressure.
The tip portion 49b is a double layer that is set to be hard (40 to 60 degrees). The spring 48 has a linear cushion, the rubber base 49 has a three-dimensional cushion, and the stamp 50 is engraved with numbers and symbols, for example, 0 to 9.

Next, the ink transfer mechanism 11 that transfers ink to the character wheels 7 and 8 constructed as described above will be described in detail based on FIG. 6.

Reference numeral 51 denotes an ink tank, in which ink 52 as an indicator, which will be described later, is stored. Inside this ink tank 51 is an ink 52.
A first transfer roll 53, which is partially immersed in water, is provided and is constantly rotated by a motor (not shown). A second transfer roll 54 is in rolling contact with the first transfer roll 53, and a third transfer roll 55 is in rolling contact with the second transfer roll 54. This third transfer roll 55 is a rubber roller,
Both axial ends thereof are rotatably supported by a slider 56. This slider 56 advances and retreats while maintaining a horizontal state by an advancing and retracting mechanism 57, and when moving forward, the third transfer roll 55 separates from the second transfer roll 54, and when retreating, they roll into contact with each other. An ink doctor 58 is attached to the tip. On the other hand, the third transfer roll 55
An elevating rod 59 is provided at the front of the rod, and is moved up and down by a cam 61 rotated by a motor 60.

Furthermore, at the upper end of this lifting rod 59, there is a transfer plate 6 made of stainless steel and having a smooth upper surface.
2 is provided. The length of this transfer plate 62 is designed so that even if it moves in the X direction of the character wheels 7 and 8, it will always be located directly below them. Moreover, when the transfer plate 62 is lowered, the third transfer roll 55
It is almost at the same height as the lower surface, and when the third transfer roll 55 moves forward, the ink attached to its surface is transferred, and when the third transfer roll 55 moves up, it is located at the lowest side of the letter wheels 7 and 8. The ink is transferred onto the stamp 50.

A cleaning mechanism 63 for cleaning ink adhering to each stamp 50 of the character rings 7 and 8 is provided at the top of the ink transfer mechanism 11 configured in this manner. As shown in FIG. 7, 64 is a cleaning liquid receiving tray in which cleaning liquid is stored. A cleaning roll 65 partially immersed in the cleaning liquid is supported in the cleaning liquid receiving tray 64 via a rotating shaft 66 . This cleaning roll 65 is made of NBR (hardness 20) or urethane (hardness 20), and its surface is in contact with the stamps 50 of the letters wheels 7 and 8. A pulley 67 is provided on the rotating shaft 66 of the cleaning roll 65, and the pulley 67 is interlocked with the first transfer roll 53 via a belt 68. The cleaning roll 65 rotates in the opposite direction while rolling into contact with the wheels 7 and 8, and supplies the cleaning liquid adhering to its surface to the stamp 50 to clean the ink adhering to the stamp 50. . Furthermore, a squeeze plate 69 is provided in the cleaning liquid receiving tray 64 and is in pressure contact with the entire length of the cleaning roll 65 to squeeze out the cleaning liquid that has soaked into the cleaning roll 65, and the pressing force is Can be adjusted arbitrarily. Note that 70 is a cleaning liquid tank, and the cleaning liquid is supplied to a pump 71.
The cleaning liquid is supplied to the cleaning liquid receiving tray 64 by the cleaning liquid receiving tray 64, and the liquid draining pipe 72 is movable up and down so that the liquid level in the cleaning liquid receiving tray 64 can be adjusted. Also,
73 is a draining pot.

Further, a wiping roll 74 is provided below the cleaning mechanism 63 configured as described above, that is, on the side in the rotational direction of the wheels 7 and 8, for wiping off the cleaning liquid adhering to the stamp 50. This roll drives the cleaning roll 65. It is linked with pulley 67.

The ink and cleaning liquid used here are as follows.

The ink used as an indicator is Fritz glass (lead content 80%) → 37% by weight Pigment Titanium oxide → 37% by weight Squeegee modified oil → 22% by weight Others → 4% by weight, specific gravity 2.8, viscosity 12000CP, modified oil No. 4 Class 2 petroleum, conductivity 1MΩ or more (non-conductive).

The cleaning liquid is a petroleum spirit with a specific gravity of 0.798, a flash point of 30°C, an initial distillation temperature of 152°C, an end point temperature of 196°C, and an aromatic content of 16.5 Vol%.

Next, the operation of the printing device configured as described above will be explained.

When the printing material 1 is temporarily stopped at the printing station 3 and a multi-digit number as an index is printed in the printing area 4 in this state, the ink transfer mechanism 11 is constantly driven. Therefore,
The ink adhering to the surface of the first transfer roll 53 is sequentially transferred to the second and third transfer rolls 54 and 55. In addition, in the printing standby state, the transfer plate 62
Although the slider 56 equipped with the third transfer roll 55 is always moved forward and backward by the advance and retreat mechanism 57, the ink adhered to the third transfer roll 55 is transferred to the transfer plate 62 when moving forward. The ink is transferred onto the surface of the ink, and at the same time, excess ink is scraped off by the ink doctor 58. Therefore, the ink on the surface of the transfer plate 62 never dries and is always in a wet state.

In this state, the character wheel drive mechanism 5 is used for printing work.
Y-axis pulse motor 25 and X-axis pulse motor 27
When driven, the XY table 6 moves in the Y direction and
move in the direction. Therefore, the two wheels 7 and 8 attached to the X table 24 move forward and backward with respect to the printing area 4 of the printing medium 1 when moving in the
When moving in this direction, it reciprocates in the width direction of the printing area 4. Further, the character wheels 7 and 8 are independently rotated by character wheel pulse motors 39 and 40, so that a desired number of stamps 50 can be selected (character selection). Therefore, as shown in FIG. 8, for example, "1, 2, 3, 4, 5, 6,
When printing 11-digit numbers such as "7, 8, 9, 0, 1" as indicators, one of the character wheels 7 selects "1",
The other character wheel 8 selects "5" and makes "1" and "5".
are printed at the same time, and then character wheels 7 and 8 are printed 1 in the Y direction.
After moving by pitch, select the characters again and print "2" to the right of "1", "6" to the right of "5",
Finally, 11 digit numbers are printed using two character wheels 7 and 8. In this case, the character wheels 7 and 8 are the pulse motor 3 for the character wheels.
9 and 40, the stamp 50 corresponding to the number to be printed is placed directly below, that is, facing the transfer plate 62. When the stamp 50 is located directly below, the cam 61 rotated by the motor 60 raises the elevating rod 59 and presses the transfer plate 62 against the stamp 50. Therefore, the ink adhered to the surface of the transfer plate 62 is transferred to the stamp 50, and when the transfer is completed, the transfer plate 62 is lowered to prepare for the next transfer, and the character wheels 7 and 8 are rotated 90 degrees in the direction of the arrow. Rotate. When the character wheels 7 and 8 rotate 90 degrees, the selected stamp 50 faces the printing area 4 with ink applied to it, and when the X table 24 moves forward in this state, the stamp 50 comes into pressure contact with the printing area 4. One printing is completed. At this time, the stamp 50 is supported by the direct cushion of the spring 48 and the three-dimensional cushion of the rubber base 49. Therefore, as shown in FIG. 9, even if the printing area 4 is curved, clear printing is possible due to the cushion effect. In other words, printing area 4 of substrate 1
The radius of curvature R is 1000mm, and the printing position is ± centered on the Y axis.
If the range is 50 mm, the first digit is tilted 2.9 degrees with respect to the 6th digit at the center of the Y-axis, and the 6th digit is tilted at 2.9 degrees in the Y-axis direction.
There is a difference of 1.25mm. However, the rubber base 49 absorbs this 2.9 degree inclination, and the spring 48 absorbs the 1.25 mm difference. Therefore,
The stamp 50 is not affected by the curvature of the printing area 4, and clear printing without deviation is possible.

On the other hand, once printing is completed, the character wheels 7 and 8 rotate in the direction of the arrow, and the stamp 5 has residual ink attached to it.
0 reaches the cleaning mechanism 63, the stamp 50 is cleaned by a cleaning roll 65 containing cleaning liquid.
The cleaning roll 65 rotates in the opposite direction to the wheels 7 and 8, but because the rotational speeds are different, the cleaning roll 65 containing the cleaning liquid rubs against the stamp 50, causing the stamp 50 to rub against the stamp 50.
The ink attached to the paper can be washed off. The stamp 50 that has been cleaned faces the wiping roll 74 as the character wheels 7 and 8 rotate, and the cleaning liquid is wiped off, so the stamp 50 ready for the next character selection and printing is always clean and free of ink transfer. Of course, gender
Clear printing can continue.

Note that FIG. 10 shows a modification of the cleaning mechanism 63, in which a squeeze roller 75 and a cleaning liquid spray nozzle 76 may be provided in place of the squeeze plate 69, and the surface of the cleaning roller 65 may be cleaned with the cleaning liquid.

Further, two or more character wheels 7 and 8 may be arranged in parallel to print simultaneously, and the number is not limited.

〔Effect of the invention〕

As explained above, according to the present invention, even if the printing area of the printing material is narrow, it is possible to print a large number of digits without arranging stamps close to each other and to move the character wheel in the width direction of the printing area. This has the effect that the printing interval can also be set arbitrarily.

[Brief explanation of drawings]

The drawings show one embodiment of the invention.
The figure is an exploded perspective view showing the general structure of the printing device, Figure 2 is a plan view of the character wheel drive mechanism, Figure 3 is a plan view of the character wheel, Figure 4 is a side view of the character wheel, and Figure 5 is a plan view of the character wheel drive mechanism. 6 is a partially cutaway side view of the ink transfer mechanism, FIG. 7 is a longitudinal sectional front view of the cleaning mechanism, FIGS. 8 and 9 are action explanatory views, and FIG. 10 is the cleaning mechanism. It is a sectional view showing a modification of . 1... Printing material, 4... Printing area, 5... Character wheel drive mechanism, 7, 8... Character wheel, 9, 10... Character selection mechanism, 11... Ink transfer mechanism, 50... Stamp,
63...Cleaning mechanism.

Claims (1)

[Claims] 1. A plurality of character wheels having a plurality of stamps on the outer peripheral surface and arranged at a distance from each other, a character selection mechanism that independently rotates these character wheels and selects the stamp, and a character selection mechanism that selects the stamp by rotating these character wheels independently, and It has a transfer plate that can freely move forward and backward, and an ink transfer mechanism that transfers the ink transferred to the surface of the plate to the stamp, and an ink transfer mechanism that moves the character ring back and forth in the width direction of the printing area of the printing material and moves it back and forth into the printing area. A printing device characterized by comprising a character wheel drive mechanism that moves and prints multiple digits in a printing area.