JPH01128834A - Non-contact wire drawing method and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable wire-drawing of a continuous line in a uniform color tone, thickness and width, by detecting the relative moving speed between a marking gun and an object of wire-drawing, and changing the stopping time of the paint spray valve while an ejecting valve of a paint is closed when the detected result is changed, without changing the opening or operating time. CONSTITUTION:In the case where the relative moving speed between a marking device 11 and a rubber sheet is changed, the stopping time of each marking gun 22 while an intermittent ejection of a paint therefrom is stopped is controlled. Accordingly, in spite of the change of the relative moving speed of the marking device 11 and the rubber sheet, the parallel distance in a drawing direction of adjacent dot marks given by the marking gun 22 can be settled at the expected value. Moreover, the time interval between the intermittent ejections of the paint by each marking gun 22 can be held constant although the relative moving speed of the marking device 11 and the rubber sheet is changed. Thus, the size of the dot marks formed on the rubber sheet by the marking gun 22 is maintained constant at all times.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a non-contact wire drawing method and apparatus.

[Prior Art J] Conventionally, line drawing 'JR' has been used to display marking lines such as tread markings on a rubber sheet or the like as a tire material. Conventional line drawing devices use a touch roller that transfers paint onto the object to be drawn while coming into contact with the object.

[Problems to be Solved by the Invention] However, the above-mentioned conventional line drawing device using a touch roller has problems such as variations in the amount of paint transferred by the touch roller and variations in the contact pressure between the touch roller and the object to be drawn. Due to this, variations in the film thickness and width of the lines applied to the object to be drawn tend to occur.As a result, the lines applied to the object to be drawn may become uneven in color or become thinner. This results in the inconvenience of having to modify or discard defective lines.

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-contact line drawing method and apparatus that can draw continuous lines with various color tones, thicknesses, and widths.

[Means for Solving the Problems] The IF contact drawing method of the present invention intermittents the paint spraying operation by the marking gun while moving the marking gun relative to the object to be drawn, and This is a non-contact line drawing method that performs line drawing by making dot-shaped marks made by sprayed paint on the object to be drawn continuous in the direction of relative movement between the marking gun and the object to be drawn. Detects the relative movement speed with the object to be drawn,
When the relative movement speed (h) changes, the paint injection stop time of the marking gun is changed in accordance with the change in the relative movement speed, but the paint injection time is not changed.

The non-contact drawing device of the present invention includes a paint filling section in which paint is filled under pressure, a paint injection nozzle that injects the pressurized paint supplied from the paint filling section, and a space between the paint filling section and the paint injection nozzle. A paint injection valve consisting of an interposed valve body and a valve seat;
A -F-'f-ng gun is constituted by an injection valve drive unit that moves the valve element of the paint injection valve toward and away from the valve seat, and a control u4 device is provided to control the injection valve drive timing of each marking gun.

This is a non-contact line drawing device that performs line drawing by making dot-shaped marks on the object to be drawn by paint sprayed from a paint injection nozzle continuous in the direction of relative movement between the marking gun and the object to be drawn. A speed detection device is provided to detect the relative movement speed between the marking gun and the object to be drawn, and the control device controls the closing of the paint injection valve by the injection valve drive unit when the detection result of the speed detection device changes. The time is changed according to the change in the relative movement speed, and the opening time of the paint injection valve is not changed.

[Operation] According to the non-contact line drawing method and device of the present invention, dot-shaped marks are attached to the object to be drawn using paint intermittently sprayed from a marking gun, and the line is drawn by making the dot-shaped marks continuous. A discount will be applied.

Here, when the relative movement speed between the marking gun and the object to be drawn changes, the intermittent paint injection stop time of the marking gun is controlled, and the dot-shaped marks placed adjacently by the marking gun are controlled. The juxtaposition interval in the drawing direction can be kept constant at a desired state despite changes in the relative moving speed between the marking gun and the object to be drawn.

Further, the intermittent paint spraying time of the marking gun is kept constant regardless of changes in the relative movement speed between the marking gun and the object to be drawn. As a result, the size of the dot-shaped mark that the marking gun makes on the object to be drawn is always kept constant.

That is, according to the present invention, drawing can be performed in a non-contact state without bringing the marking gun into contact with the object to be drawn. In addition, regardless of whether or not there is a change in the relative movement speed between the marking gun and the object to be drawn, the spacing between the dot-like marks attached adjacent to the object to be drawn and the size of each dot-like mark are kept constant. , line film thickness and film width can be kept constant. −
Therefore, it is possible to draw a continuous line with a negative color tone and a thickness of 1 width.

[Example] Fig. 1 is an overall configuration diagram showing one embodiment of the present invention, Fig. 2 is a front view showing a marking device, Fig. 3 is a waveform diagram showing the marking gun injection valve drive timing, and Fig. 4 is a sectional view taken along the rV-IT line in FIG. 2;

Fig. 5 is a sectional view taken along the v-v line in Fig. 4, and Fig. 6 is a sectional view along the v-v line in Fig. 4.
A cross-sectional view along the Vl-Vl line in the figure, Figure 7 is the ■-- of Figure 4.
8 is a cross-sectional view taken along the line (2) and is a schematic diagram showing the control device.

As shown in FIG. 1, the drawing device 1 is configured to draw a rubber sheet (as a tire material) continuously extruded from an extrusion device (not shown).
One to a plurality of (four in this embodiment) marker lines 3 are displayed on a line drawing object) 2. The drawing device 1 includes a marking device 11, a paint pressure feeding device 12, a speed detection device 13, and a control device 11. tr1114 Nitem sale tail.

As shown in FIG. 2, the marking device 11 has a plurality of (four in this embodiment) marking guns 22 arranged in a manifold 21. As a result, the marking device 11
controls the paint injection timing (injection valve drive timing) of each marking gun 22. A dot-shaped mark is attached to the rubber sheet 2. The line drawing device 1 places a dot-shaped mark on the rubber sheet 2 in the direction of movement of the rubber sheet 2 (the direction of relative movement between the marking gun 22 and the rubber sheet 2). ! The above-mentioned marker line 3 can be drawn by continuing the line.

Here, as shown in FIG. 4, in the marking device 11, each marking gun 22 is attached to a gun attachment base 23 of a manifold 21, and a paint injection nozzle 24 (described later) of each marking gun 22 is arranged in a nozzle array of the manifold 21. They are arranged on base 25. In addition, the marking device 11 has a plurality of independent slots 25A formed in the intermediate base 26 of the manifold 21 and the nozzle array base 25, which communicate the corresponding marking guns 22 and paint injection nozzles 24, respectively. (See Figures 6 and 7).

27.28 is Patsukin. 29 is an assembly screw.

As shown in FIG. 4, each marking gun 22 includes a housing 31 screwed onto the gun mounting base 23 of the manifold 21, a paint filling portion 32. The aforementioned paint injection nozzle 2
4. Paint injection valve 33. It is configured to include an injection valve drive section 34.

The paint filling section 32 communicates with a pressurized paint tank 35 of the paint pressure feeding bag W112, which will be described later, and is filled with paint under pressure. 32A is a pressurized paint inlet. 32B is a paint outlet that is closed during marking operation.

The paint spray nozzle 24 sprays pressurized paint supplied from the paint filling section 32 .

The paint injection valve 33 consists of a stem-shaped valve body 36 and a valve seat 37. Note that the tip of the valve body 36 has a spherical shape that can be seated on the valve seat 37.

The injection valve drive unit 34 moves the valve body 36 of the paint injection valve 33 to the valve seat 3.
It consists of an electromagnetic coil 38 and a fixed iron core 39 that are fixedly arranged on the housing 31 and a movable iron core 40 that is movably arranged on the housing 31 in order to open and close with respect to the end of the movable iron core 40. The proximal end of 36 is fixed. Note that between the /X housing 31 and the valve body 36,
A closing spring 41 is provided that always urges the valve body 36 toward the valve seat 37. That is, when the paint injection valve 33 is energized to the electromagnetic coil 38, the valve body 36 is separated from the valve seat 37 by the electromagnetic attraction force that overcomes the elastic force of the closing spring 41, and becomes open. When the valve body 36 is not energized, the resilient force of the closing spring 41 urges the valve body 36 toward the valve seat 37 to bring it into the closed state.

Here, the opening/closing timing of the paint injection valve 33 by the injection valve drive unit 34 (injection valve drive timing) is determined by controlling the timing of energizing the electromagnetic coil 38 by the control device 14. Electromagnetic coil 38 in control bag 2114
If you change the de-energization time (OFF time in Figure 3),
The interval between adjacent dot-shaped marks can be changed on the condition that the relative movement speed between the marking device 2111 and the rubber sheet 2 is constant. Furthermore, by changing the energization time ((IN time) in FIG. 3) to the electromagnetic coil 38 using the control device 14, the amount of paint sprayed can be increased or decreased, and the size (diameter) of each dot-like mark can be changed.

As shown in FIG. 1, the paint pressure feeding bag fi12 includes an air compressor 51, a regulator 52, an accumulator 53, a pneumatic header 54, and the aforementioned pressurized paint tank 35.

Air compressor 51, regulator 52, accumulator 5
3. The pneumatic ladder 54 supplies the pressurized paint tank 35 with compressed air necessary for stable paint pressure feeding, and the control device 14 uses the detection results of the pressure detector 55 provided in the pneumatic header 54. The air compressor 51 is driven and controlled accordingly.

The pressurized paint tank 35 is additionally equipped with an automatic stirring device 56 operated by pneumatic pressure. Further, the pressurized paint tank 35 is equipped with a paint remaining amount detection device 57, and the control device 14 prevents the possibility that the detection result of the remaining amount detection device 57 reaches the allowable lower limit value and air gets caught in the paint being fed under pressure to the marking gun 11. When this occurs, the driving of the marking device 11 is forcibly stopped.

The speed detection device 13 detects the moving speed of the rubber sheet 2 (relative moving speed between the marking gun 22 and the rubber sheet 2), and transfers the detection result to the control device 14.

Therefore, when the detection result of the speed detection device 13 changes, the control device 14 determines (1) the closing time of the paint injection valve 33 by the injection valve drive unit 34 in each marking gun 22 (the paint injection stop time of each marking gun 22); The above relative movement is performed so that the spacing of the dot-shaped marks that the marking gun 22 makes adjacent to the rubber sheet 2 in the drawing direction is always constant, and the line film thickness and film width are continuously kept constant. The opening time of the paint injection valve 33 (paint injection time of each marking gun 22) is changed according to the change in speed, and the size (diameter) of the dot-shaped mark that the marking gun 22 makes on the rubber sheet 2 is always the same. The line film thickness and film width are kept constant regardless of changes in the above-mentioned relative movement speed so that the line film thickness and film width are continuously kept constant.

Note that the control device 14 is configured as follows, for example, in order to execute the above control operations. That is, the control device 1
4 consists of a microcomputer as shown in FIG. 8, and includes an input circuit 61. Output circuit 62, CPU (central processing unit) 63. ROM (read-only memory) 64. RAM C
It is composed of a writable and readable waterfall memory) 65, etc. In addition, 6
6 is a drawing condition setting device.

The control device 14 presets the optimal paint pressure for each drawing condition such as paint used, line thickness, line width, etc.
The air compressor 51 is controlled so that the detection result of the pressure detector 55 matches the value stored in the ROM 64 as described above.

Further, the control device 14 stores in advance in the ROM 64 the above-mentioned permissible lower limit value of the residual amount in the pressurized paint tank 35, and as described above, the detection result of the remaining amount detection device 57 is
When the value matches the value stored in the OM64, the driving of the marking device 11 is forcibly stopped.

The control device 14 also stores in the ROM 64 in advance the relationship between the opening time of the paint injection valve 33 (paint injection time of each marking gun 22) and the size (diameter) of the dot-shaped mark under various drawing conditions. The opening time of the paint injection valve 33 during the current line drawing is set so that the size of the dot-like mark that matches the desired line film thickness and film width is stably maintained. The injection valve drive unit 34 is driven and controlled according to the stored value.

The control device 14 also controls the relative movement speed between the rubber sheet 2 and the marking device 11, the closing time of the paint injection valve 33 (paint injection stop time of each marking gun 22), and the adjacent The three-way relationship between the juxtaposed spacing of the dot-shaped marks to be attached is stored in advance in the ROM 64, and the closing time of the paint injection valve 33 during the current line drawing is adapted to the current desired line film thickness and film width. The injection valve drive section 34 is controlled in accordance with the detection results of the speed detector 13 and the values stored in the ROM 64 so as to stably maintain the spacing between the dot-shaped marks.

Next, the operation of the above embodiment will be explained.

According to the line drawing device 1, a dot-shaped mark is attached to the rubber sheet 2 as the object to be drawn using paint intermittently sprayed from each marking gun 22 of the marking device 11, and the i of this dot-shaped mark is ! The marker line 3 is drawn by connecting the lines.

Here, mark "A fi! 11" and rubber sheet 2.
When the relative movement speed changes, the intermittent paint injection stop time of each marking line 22 is controlled,
The juxtaposition spacing in the drawing direction of the dot-like marks placed adjacently by the marking gun 22 can be kept constant at the desired state despite changes in the relative movement speed between the marking device 5911 and the rubber sheet 2. .

Further, the intermittent paint spraying time of each marking gun 22 is determined by the relative movement speed between the marking device 11 and the rubber sheet 2.
It remains constant regardless of changes in temperature. Thereby, the size of the dot-shaped mark that the marking gun 22 makes on the rubber sheet 2 is always kept constant.

That is, according to the above embodiment, the marking device 11 can be drawn in a non-contact state without contacting the rubber sheet 2. Furthermore, regardless of whether or not there is a change in the relative moving speed between the marking device 11 and the rubber sheet 2, the rubber sheet 2
The spacing between the dot-like marks attached adjacent to the dot-like marks and the size of each dot-like mark are made constant, and the line film thickness and film width can be made constant. Therefore, continuous marker lines 3 can be drawn with different color tones, thicknesses, and widths.

In addition, in carrying out the present invention, the injection valve drive section is not limited to electromagnetic force drive, but may be driven by other means such as pneumatic drive.

[Effects of the Invention] As described above, according to the non-contact line drawing method and apparatus of the present invention, continuous lines can be drawn with different color tones, thicknesses, and widths.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a front view showing a marking device, Fig. 3 is a waveform diagram showing the marking gun injection valve drive timing, and Fig. 4 is a diagram showing the marking gun injection valve drive timing. A sectional view taken along the TV-TV line. Figure 5 is a sectional view taken along line v-V in Figure 4, and Figure 6 is a cross-sectional view of Figure 4.
FIG. 7 is a cross-sectional view taken along the line ■--■ in FIG. 4, and FIG. 8 is a schematic diagram showing the control device. 1... Line drawing device, 2... Rubber sheet (object to be drawn). 3... Sign line. 11...Marking device, 12...Paint pressure feeding device. 13...Speed detection device. 14...Control device, 22...Marking gun, 24...Paint injection nozzle. 31...Housing. 32...Paint filling section, 33...Paint injection valve, 34...Injection valve drive section, 35...Pressurized paint tank. 36... Valve body, 37... Valve seat. Agent Patent Attorney Osamu Shiokawa Figure 3 N Figure 4 Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) While moving the marking gun relative to the object to be drawn, the paint spraying operation by the marking gun is made intermittent, and the paint sprayed from the marking gun marks the object in the form of dots. A non-contact line drawing method that performs line drawing by continuous movement in the direction of relative movement between the gun and the object to be drawn, in which the relative movement speed between the marking gun and the object to be drawn is detected, and the relative movement speed is detected. A non-contact line drawing method in which the paint injection stop time of the marking gun is changed in accordance with the change in the relative movement speed, but the paint injection time is not changed when the marking gun changes. (2) A paint filling part that is filled with paint under pressure, a paint injection nozzle that sprays the pressurized paint supplied from the paint filling part, and a valve body and valve that are interposed between the paint filling part and the paint injection nozzle. A marking gun is composed of a paint injection valve consisting of a seat, and an injection valve drive unit that moves the valve body of the paint injection valve toward and away from the valve seat, and a control device that controls the injection valve drive timing of each marking gun. A non-contact line drawing device that performs line drawing by making the dot-like mark that is attached to the object to be drawn by paint sprayed from a paint injection nozzle continuous in the direction of relative movement between the marking gun and the object to be drawn. A speed detection device is provided to detect the relative movement speed between the marking gun and the object to be drawn, and the control device controls the paint injection valve by the injection valve drive unit when the detection result of the speed detection device changes. A non-contact drawing device in which the closing time of the paint injection valve is changed according to the change in the relative movement speed, and the opening time of the paint injection valve is not changed.