JPH0632988B2 - Printer - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a printing apparatus, for example, in a production line for cathode ray tubes, in which an indicator for identifying a type is attached to a cathode ray tube in which different types are mixed and flowing.

[Technical Background of the Invention and Problems Thereof] In one production line, for example, in an automatic production line in which an indicator is attached to each cathode ray tube flowing on a conveyor and a process based on the indicator is performed in a subsequent process, It is necessary to provide a clear index that is easy to read at a predetermined position.

Therefore, conventionally, a printing device (marking device) has been widely used as this kind of indexing means. In this printing device, stamps composed of, for example, numbered rubber stamps 0 to 9 are arranged in parallel, and ink is attached to the stamps to print on the print area of the cathode ray tube. However, as the number of CRT varieties increases, the index becomes more complicated, and when indexing by number, there is no choice but a large number of digits. For example, when printing with a 12-digit number as an index, 12 stamps are arranged side by side and printed at one time. However, it is necessary to change that number randomly each time, and when the printing area is narrow. Accordingly, it is necessary to place the stamps closer to each other.

Therefore, the stamp, that is, the number is naturally small, clear printing cannot be expected, and character selection becomes difficult as the number of digits increases.

Therefore, a plurality of stamps are arranged side by side on the outer peripheral surface, and the desired stamps are selected by rotating these scrolls independently, and after transferring the ink to this stamp, it is printed on the substrate. A printing device designed to print has been developed. However, as shown in FIG. 11, when the printing area a of the printing material has a curved surface, even if the stamp c of the one ring b is in close contact with the printing area a, the stamp of the other ring d is printed. In the case of e, the gap f is generated due to the curved surface of the printing area a, and printing unevenness occurs.

[Object of the Invention]

The present invention has been made by paying attention to the above circumstances, and an object thereof is that even if a print area of a printing target has a curved surface, the printing is deformed along the curved surface, and clear printing without uneven printing is provided. An object of the present invention is to provide a printing device capable of various printing.

[Outline of Invention]

In order to achieve the above object, the present invention arranges guide holes radially around the axis of the character ring body, and provides these guide holes with a stamp mount urged by a spring in the protruding direction. The stamp is integrally provided on the stamp mount via the elastic rubber layer, and a three-dimensional cushioning property is provided by the synergistic effect of the spring and the elastic rubber layer.

Example of Invention

Hereinafter, the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 shows a schematic configuration of the entire printing apparatus. Reference numeral 1 is a printed material such as a cathode ray tube.
It is conveyed intermittently above and temporarily stopped at the printing station 3. A part of the material to be printed 1 is provided with a print area 4 in which an index for identifying the type of product, for example, a multi-digit number is printed. Reference numeral 5 denotes a letter wheel drive mechanism, which is composed of an XY table 6, and a plurality of, in this embodiment, two letter wheels 7 and 8 are provided on the XY table 6. 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 back and forth with respect to the printing area 4 when driven in the Y direction. Has been done.
Furthermore, the character wheels 7 and 8 are provided with character selection mechanisms 9 and 10 that rotate them independently. Also, the above XY
Below the table 6 and the character wheels 7 and 8, an ink transfer mechanism 11 that transfers ink to the character wheels 7 and 8 is provided.

Each mechanism that constitutes the printing apparatus is configured as follows.

First, referring to FIG. 2, the character wheel drive mechanism 5 will be described in detail. Reference numeral 21 is a Y table of the XY table 6, which is Y table.
The shaft guides 22, 22 are configured to be movable in the print Y direction. The X-axis guide 2 is placed on the Y table 21.
3 and 23 are provided, and the X-axis guides 23 and 23 have X
A table 24 is provided so as to be movable in the arrow X direction. The Y table 21 is driven by a Y-axis screw 26 directly connected to the Y-axis pulse motor 25, and the X table 24 is driven by an X-axis screw 28 directly connected to the X-axis pulse motor 27. Therefore, the X table 24 is designed to move in the XY directions, and the front end portion of the X table 24 is provided with the character ring attachment portion 29.

And, as shown in FIGS. 3 and 4, the character wheels 7 and 8 and the character selection mechanisms 9 and 10 are attached to the character wheel attachment portion 29. That is, 31 is a support frame, and the support frames 31 are provided with rotating shafts 32, 33 concentrically provided with each other.
Are rotatably supported by bearings 34 and 35. The inner ends of the rotary shafts 32 and 33 are rotatably supported by a common bearing 36, and the gears 37 and 38 are fitted to the outer ends thereof. Further, these gears 37, 38 are the above-mentioned character selection mechanism 9,
The gear 4 of the pulse motors 39 and 40 for the character wheel constituting the gear 10.
1, 42 are meshed with each other, and the rotation shafts 32, 33 are independently driven to rotate. Further, the character wheels 7 and 8 are fitted to the rotary shafts 32 and 33, respectively.

These character wheels 7 and 8 have the same structure and are configured as shown in FIG. That is, reference numeral 43 is a disk-shaped main body of a ring, which is formed in a reflective shape from the center thereof, for example, 1
Two guide holes 44 ... Are provided at equal intervals. A stamp mount 45 is inserted into these guide holes 44 so as to project and retract in the radial direction. A stroke restricting hole 47 that loosely fits into the stopper pin 46 is formed in the longitudinal intermediate portion of the stamp mounting base 45, and a spring 48 that biases the stamp mounting base 45 in the projecting direction is provided at the bottom of the guide hole 44. Is stored. The stamp 50 is integrally attached to the outer end surface of each stamp mounting base 45 thus mounted via a rubber base 49 as an elastic layer. here,
The repulsive force (F
s) = 100 g and spring coefficient (Fk) = 36 g / mm are used, and the acting force is set to F = Fs + (Fk × l). (However, l is the distance moved) Further, the rubber base 49 is
The base portion 49a thereof is slightly deformed by the printing pressure.
Is soft (around 20 degrees), the tip 49b is hard (40-6)
It is a double layer set to 0 degree). The spring 48 has a linear cushion, the rubber base 49 has a three-dimensional cushion, and the stamp 50 has, for example, 0-9.
The numbers and symbols are engraved.

Next, the ink transfer mechanism 11 for transferring the ink to the character wheels 7 and 8 configured as described above will be described in detail with reference to FIG.

Reference numeral 51 is an ink tank, in which ink 52 as an index agent described later is stored. Inside the ink tank 51 is provided a first transfer roll 53 partially immersed in the ink 52, which is constantly rotated by a motor (not shown). A second transfer roll 54 is in contact with the first transfer roll 53, and a third transfer roll 55 is in contact with the second transfer roll 54. The third transfer roll 55 is a rubber roller, and both axial ends thereof are rotatably supported by the slider 56.
The slider 56 is moved forward and backward by an advancing and retracting mechanism 57 while maintaining a horizontal state, and the third transfer roll 55 is moved to the second position during forward movement.
Is separated from the transfer roll 54 and rolls in contact with each other when retracted.
8 is attached. On the other hand, the third transfer roll 5
An elevating rod 59 is provided at the front part of 5, and is moved up and down by a cam 61 rotated by a motor 60. Further, a transfer plate 62 made of a stainless steel material and having an upper surface smoothly finished is provided on the upper end of the elevating rod 59. The length of the transfer plate 62 is designed so that it is always positioned immediately below the character wheels 7 and 8 even if they move in the X direction. Moreover, when the transfer plate 62 descends, it has substantially the same height as the lower surface of the third transfer roll 55, and when the third transfer roll 55 advances, the ink attached to the surface thereof is transferred. With
The ink is transferred to the stamp 50 located on the lowermost side of the character wheels 7 and 8 when rising.

A cleaning rotation mechanism 63 for cleaning the ink adhering to each stamp 50 of the character wheels 7 and 8 is provided above the ink transfer mechanism 11 configured as described above. As shown in FIG. 7, reference numeral 64 is a washing liquid receiving tray, in which the washing liquid is stored. In the cleaning liquid receiving tray 64, a cleaning roll 65, a part of which is immersed in the cleaning liquid, is pivotally supported via a rotary shaft 66. This cleaning roll 65 is NBR (hardness 2
0) or urethane (hardness 20), the surface of which is in contact with the stamp 50 of the character wheels 7 and 8. A pulley 67 is provided on the rotary shaft 66 of the cleaning roll 65,
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 rollingly contacting the character wheels 7 and 8, and supplies the cleaning liquid adhering to the surface thereof to the stamp 50 to clean the ink adhering to the stamp 50. . Further, a diaphragm plate 69 is provided in the cleaning liquid receiving tray 64 so as to come into pressure contact with the cleaning roll 65 over the entire longitudinal direction.
The cleaning liquid soaked in 5 is squeezed out, and the pressure contact force can be adjusted arbitrarily. A cleaning liquid tank 70 supplies the cleaning liquid to the cleaning liquid receiving tray 64 by a pump 71, and a drain pipe 72 thereof is vertically movable so that the liquid level in the cleaning liquid receiving tray 64 can be adjusted.
Further, 73 is a drain cock.

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

The ink and cleaning liquid used here are as follows.

The ink as the index agent is frit glass (lead component 80%) → 37% by weight pigment titanium oxide → 37% by weight squeegee modified oil → 22% by weight other → 4% by weight, its specific gravity is 2.8, viscosity 12000CP, Modified oil type 4 type 2 petroleum, conductive 1 MΩ or more (non-conductive).

The cleaning liquid was petroleum spirit, specific gravity 0.798, flash point 30 ° C., initial distillation 152 ° C., end point 196 ° C., aromatic content 16.
Contains 5 vol%.

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

When the material to be printed 1 is temporarily stopped at the printing station 3 and a multi-digit number as an index is printed on the printing area 4 in this state, the ink transfer mechanism 11 is constantly driven. Therefore, the ink that has adhered to the surface of the first transfer roll 53 is not transferred to the second and third transfer rolls 54 and 55.
Are sequentially transferred to. Although the transfer plate 62 is in the lower position in the print standby state, the slider 56 having the third transfer roll 55 is always moved forward and backward by the forward / backward movement mechanism 57. The adhering ink is transferred to the surface of the transfer plate 62 during forward movement, and at the same time, the excess ink is scraped off by the ink doctor 58. Therefore, the ink on the surface of the transfer plate 62 does not dry and is always in a wet state.

In this state, when the Y-axis pulse motor 25 and the X-axis pulse motor 27 of the character wheel drive mechanism 5 are driven for printing work,
The XY table 6 moves in the Y direction and the X direction. Therefore, the two ring wheels 7 attached to the X table 24,
8 moves forward and backward with respect to the printing area 4 of the printing medium 1 when moving in the Y direction, and reciprocates in the width direction of the printing area 4 when moving in the X direction. Further, the character wheels 7 and 8 are independently rotated by the character wheel pulse motors 39 and 40 so that the stamp 50 having a desired number can be selected (character selection). Therefore, as shown in FIG. 8, for example, 1 of "1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1" is displayed in the print area 4.
When printing with a one-digit number as an index, one character ring 7 selects "1" and the other character ring 8 selects "5" to print "1" and "5" at the same time. Next, the letters 7 and 8 are Y
After one pitch in the direction, select the letter again and print "2" next to "1" and "6" next to "5". Print at 7 and 8. In this case, the character wheels 7 and 8 are rotated by the driving of the character wheel pulse motors 39 and 40, and the stamp 50 of the number to be printed first
Directly below, that is, facing the transfer plate 62. Seal 50
Is positioned directly below, the cam 61 rotated by the motor 60 raises the elevating rod 59, and the transfer plate 62 is imprinted with the stamp 5.
Press on 0. Therefore, the ink attached to the surface of the transfer plate 62 is transferred to the stamp 50, and when the transfer is completed, the transfer plate 62 descends to prepare for the next transfer.
The wheels 7 and 8 rotate 90 ° in the direction of the arrow. When the character wheels 7 and 8 are rotated by 90 °, the selected stamp 50 faces the printing area 4 in a state where ink is applied, and when the Y table 21 advances in this state, the stamp 50 is pressed against the printing area 4. Then, one printing is completed. At this time, the stamp 50 is supported by the linear cushion of the spring 48 and the three-dimensional cushion of the rubber base 49. Therefore, the ninth
As shown in the figure, even if the printing area 4 is curved, clear printing can be performed by the cushion effect. That is, assuming that the printing area 4 of the substrate 1 has a radius of curvature R = 1000 mm and the printing position is within a range of ± 50 mm about the Y-axis center, the first digit is inclined by 2.9 degrees with respect to the sixth digit on the Y-axis center, There is a 1.25 mm difference in the Y-axis direction with respect to the 6th digit. However, the rubber stand 49 absorbs this 2.9 degree inclination,
The spring 48 absorbs the difference of 5 mm. Therefore, the stamp 50 is not affected by the curvature of the printing area 4, and clear printing without misalignment is possible.

On the other hand, after one printing is completed, the character wheels 7 and 8 rotate in the direction of the arrow, and the stamp 50 on which the ink remains remains is the cleaning mechanism 6.
When the number reaches 3, the stamp 50 is cleaned by the cleaning roll 65 containing the cleaning liquid. The cleaning roll 65 is rotating in the direction opposite to the character wheels 7 and 8, but since the rotation speed is different, the cleaning roll 65 containing the cleaning liquid rubs against the stamp 505 * to remove the ink adhering to the stamp 50. Can be washed off. The stamp 50, which has been cleaned, faces the wiping roll 74 as the character wheels 7 and 8 rotate, and the cleaning liquid is wiped off. Therefore, the stamp 50, which is suitable for the next character selection and printing, is always clean and the ink is transferred. As a matter of course, clear printing can be continued.

FIG. 10 shows a modification of the cleaning mechanism 63, which is a diaphragm plate 69.
Alternatively, the squeeze roller 75 and the cleaning liquid jet nozzle 76 may be provided to clean the surface of the cleaning roller 65 with the cleaning liquid.

Further, two or more character wheels 7 and 8 may be arranged side by side so that they can be printed simultaneously, and the number thereof is not limited.

〔The invention's effect〕

As described above, according to the present invention, even if the printing area of the printing material is narrow, the character wheels are not arranged side by side,
Since printing of a large number of digits is possible and the character ring can be moved in the width direction of the printing area, the printing interval can be set arbitrarily. Furthermore, since the stamp provided on the character ring has a three-dimensional cushioning effect due to the synergistic effect of the spring and the elastic rubber layer, even if the printing area of the printed material has a curved surface, it deforms along the curved surface. The effect of being able to perform clear printing without uneven printing can be achieved.
Further, since the spring and the elastic rubber layer are provided independently for each stamp, even if the frequently stamped specific stamp is worn, there is an effect that the print density is not uneven.

[Brief description of drawings]

1 to 9 show an embodiment of the present invention, and FIG. 1 is an exploded perspective view showing a schematic configuration of a printer,
2 is a plan view of the character wheel drive mechanism, FIG. 3 is a plan view of the character wheel, FIG. 4 is a side view of the character wheel, FIG. 5 is a sectional view of the character wheel, and FIG. Partially cutaway side view, FIG. 7 is a vertical sectional front view of the cleaning mechanism, FIGS. 8 and 9 are operation explanatory views, and FIG. 10 is a cross-sectional view showing a modified example of the cleaning mechanism.
The figure is an illustration of a conventional printing apparatus. 1 ... Printed material, 7, 8 ... letter ring, 43 ... letter ring main body,
49 ... Rubber layer (elastic layer), 44 ... Guide hole, 45 ...
... Stamp mount, 50 ... Stamp.

Claims (4)

[Claims] 1. A plurality of character wheels having a plurality of markings on an outer peripheral surface thereof and spaced apart from each other, and a character selecting mechanism for independently rotating the character wheels to select the marking. An ink transfer mechanism that has a transfer plate that can move back and forth with respect to the character wheel, and transfers the ink transferred on the surface of the character to the stamp, and moves the character wheel in the width direction of the printing area of the printing target to print the area. A character wheel drive mechanism for printing a plurality of digits, and a plurality of guide holes radially provided around the rotation axis of the character wheel. A printing apparatus characterized in that a stamp mounting base projecting from the outer peripheral surface of the character ring and biased by a spring in the projecting direction is provided, and the stamp is provided at the tip end of these printing mounting bases via an elastic rubber layer. . 2. A printer according to claim 1, wherein the character wheel drive mechanism is capable of moving the character wheel forward and backward to and from a printing area of a printing material. 3. A cleaning liquid tank containing a cleaning liquid is provided in the vicinity of the character ring according to claim 1, and the cleaning liquid tank contains the cleaning liquid and is attached to the seal of the character ring. A printing apparatus comprising a cleaning rotator that is rotatably provided to rub off ink adhering to a stamp. 4. The printing apparatus according to claim 3, wherein the cleaning rotary member is a cleaning roll.