JPS6254667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire marking device, and more specifically, in a deflate marking method in a tire uniformity machine, marking the maximum position of uniformity and stamping a uniformity level grading mark. This invention relates to a marking device.

Conventionally, this type of equipment has two methods: the inflation marking method, in which the tire is chucked onto the main shaft rim of a uniform-formity machine, and a mark is stamped on the tire under internal pressure; A deflate marking method is known in which a mark is stamped on the tire.

The former inflated marking method is unfavorable from the viewpoint of uniformity measurement ability because the time to stamp the mark is included in the uniform machine cycle, while the latter deflate marking method involves the time to stamp the mark in the uniform machine cycle. Since this method is not included in the uniformity measurement time, it is more advantageous than the former method in terms of measurement ability.

Also, marking is done by pressing the mark tape onto the tire with heated punches of various shapes and transferring and stamping the mark in the same shape as the punch onto the tire surface, but in order to improve the transfer rate, it is necessary to It is important that the mark punch is pressed perpendicularly to the surface, that the pressing force is appropriate, and that the mark punch surface temperature is appropriate.

By the way, in the former inflated marking method, since the tire is filled with air, there is little deformation of the tire even when the mark punch is pressed against it, so the pressing force and pressing direction are relatively unimportant factors. .

On the other hand, in the latter deflate marking method, the tire side part, which is the stamping surface, has low rigidity and is easily deformed. The tire was often deformed when the mark punch was pressed, and the contact point between the mark punch and the tire was shifted, resulting in defective mark transfer.

By the way, in the conventional deflate marking method as described above, the tire surface and the marking surface of the mark punch are matched by the angle of the marking head only, so the tire surface and the marking surface of the mark punch are Even if they match, the direction in which the mark punch is pressed is not perpendicular to the tire surface, so deformation of the tire when the mark punch is pressed causes the contact point between the mark punch and the tire surface to shift, resulting in poor mark transfer.

Furthermore, since the mark punch was directly pressed by a cylinder that supported the weight of the movable parts including the marking head, it was very difficult to adjust the stamping pressing force.

For example, when the weight of the movable part is 30Kg and the pressing force is 5Kg±1Kg, the air pressure adjustment of the air cylinder requires an accuracy of 1/35.

In addition, in both the inflated marking method and the deflated marking method, the radial marking point position of the tire and the mark punch marking surface angle are as follows:
It was virtually impossible to randomly mark tires of different sizes because people had to change the adjustment steps for each size.

This invention was devised by paying attention to the conventional problems, and its purpose is to be able to perform marking work without the need for manpower, especially in the deflate marking method, and to make it possible to distinguish between marks. The present invention provides a tire marking device that significantly reduces errors and improves mark transfer efficiency.

In order to achieve the above-mentioned object, the present invention has a marking arm with a marking head rotatably attached to its tip, whose base end is attached to be swingable and rotatable in the radial direction of the tire, and the center of swing of the marking arm is The gist is that the marking head is located in the same plane as the tip end surface of the mark punch of the marking head.

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows an overall schematic configuration diagram of a uniformity machine equipped with a marking device of the present invention.
1 is the uniform machine stand, 2 is the tire T
A roll conveyor (hereinafter referred to as the conveyor) that conveys the image, 3 is an inflation marking device installed in the pedestal 1, and 4 is a deflate that is attached to one side of the conveyor 2 and to the frame 5 of the pedestal 1. It is a marking device.

As shown in FIG. 2, in the deflate marking device 4, a base end 6a of a marking arm 6 is rotatably supported on a table 8 via a pin 7 (swing center of the marking arm 6). 8 is connected to the frame 5 of the pedestal 1 via a guide 9.
It is slidably supported. A nut 10 is attached to the back side of the table 8, and a feed screw 12, which is rotationally driven by a motor 11, is screwed into the nut 10.

Therefore, when the motor 11 is driven to rotate, the table 8 is moved up and down along the guide 9 via the feed screw 12 and the nut 10, and the amount of movement of the table 8 is detected by the position detector 13 provided on the side of the frame 5. It is something to detect.

Also, between the table 8 and the marking arm 6 is an air cylinder 1 that swings the marking arm 6 in the radial direction of the tire T using a pin 7 as a fulcrum.
4 are connected by pins 15a and 15b.

A feed screw 16 is disposed along the longitudinal direction of the marking arm 6, and the feed screw 16 is rotationally driven via a motor 17 attached to the rear end side of the marking arm 6. A nut 18 screwed onto the screw 16 is configured to slide along the longitudinal direction of the marking arm 6. A marking head 20 equipped with a mark punch heater (not shown), a mark punch selection rotation device, and a mark tape feed device is attached to the nut 18 screwed onto the feed screw 16 via a guide member 19, and this marking A mark punch 21 is attached to the head 20 and is rotatable in the radial direction of the tire T. Further, a marking head 20 is attached to the guide member 19.
A position detector 22 is attached to detect the position of.

Note that 23 is a counterweight for canceling the dead weight of the marking arm 6.

Further, the center of swing of the marking arm 6, that is, the pin 7 supporting the base end 6a of the marking arm 6 and the tip end surface 21a of the mark punch 21 are set to be located in the same plane. If the marking surface of the tire T and the tip surface 21a of the mark punch 21 match at any swing angle, the pressing direction of the mark punch 21 is always set to be perpendicular to the marking surface of the tire T. .

Next, the operation of the above embodiment will be explained based on FIGS. 3 and 4.

First, set the tire T on the conveyor 2,
Next, the air cylinder 14 is contracted, the marking arm 6 is rotated clockwise in FIG. 3 about the pin 7, and the mark punch 21 is pressed to a desired position on the tire T.

In this state, visually check the position of the mark punch 21 in the radial direction of the tire T and whether or not the mark punch 21 is in perpendicular contact with the surface of the tire T (see FIG. 4). If the position and angle α are not appropriate, the air cylinder 14 is extended, the mark punch 21 is once removed from the tire surface S, and the motors 17 and 11 are driven to adjust the position of the marking head 20 and the marking arm. The position of the pin 7, which is the center of swing of the pin 6, is moved.

For example, if the pin 7 is raised upward, the angle α between the stamping pressing direction of the mark punch 21 and the vertical direction becomes larger, and conversely, if the pin 7 is lowered, the angle α becomes smaller. Repeat the above operations and adjust the position and angle to suit your needs.

Next, use mark tape (not shown) to actually engrave and check the engraving condition. For example, if the tire tread side is in stronger contact, the center of oscillation is raised as described above, and if the tire bead side is in stronger contact, the pin 7 is lowered.

However, if the position of the pin, which is the center of swing, is moved up or down, the position of the mark punch 21 in the radial direction of the tire T also changes, so it must be readjusted. However, if the above adjustment is performed once for each tire T, and the position is read and recorded by the position detectors 13 and 22, it is sufficient to set the position to the recorded position next time.

Next, the pressing force of the mark punch 21 is adjusted by the air pressure supplied to the air cylinder 14. When the air pressure is high and the pressing force is large, the deformation of the tire T is large, and the pressing force around the mark is strong, resulting in insufficient transfer of the central part of the mark. Furthermore, if the pressing force is small, the overall transfer will be insufficient.

By the way, the swing center 7 of the marking arm 6
is located in the same plane as the tip surface 21a of the mark punch 21, so at any swing angle α,
Stamp surface of tire T and mark punch tip surface 21a
If they match, the pressing direction of the mark punch 21 will always be perpendicular to the stamping surface of the tire T.

The tip 21a of the mark punch 21 draws an arc when swinging, but when the tip 21a of the mark punch 21 contacts and is pressed against the surface S of the tire T, the deflection of the tire T depends on the rotation radius of the mark punch 21. Therefore, the deviation of the contact point and the angle of the contact point between the tip 21a of the mark punch 21 and the tire surface S due to the deflection of the tire T does not affect the mark transfer rate.

Next, regarding the pressing force of the mark punch 21 on the tire T, it is important to have a counterweight 23 that removes the weight of the marking arm 6, and to apply pressure from the center of swing of the marking arm 6 to the point of action of the air cylinder 14. Distance and marking arm 6
Since the ratio of the distance from the center of oscillation to the mark punch 21 is as large as approximately A:L, the pressing force of the mark punch 21 can be finely adjusted. For example, ● A/L = 1/4 ● Marking head weight 10Kg ● Pressing force of mark punch 5Kg ± 1Kg, the air pressure adjustment of air cylinder 14 is 1 x L/A/(10-5) x L The accuracy is /A=1/5, and adjustments can be made with much higher precision than the conventional 1/35.

Next, another embodiment in which an angle sensor and a photoelectric switch are attached to the marking head section will be described.

FIG. 5 shows a state in which an angle sensor 24 and a photoelectric switch 25 are attached to the marking head 20, 21 is a mark punch, and T is a tire cross section. When marking the tire T using the angle sensor 24 and photoelectric switch 25, the marking head 20 is first positioned at the center of the tire T, and the marking head 20 is moved in the tire radial direction by the drive motor 17. let

The photoelectric switch 25 stops the movement of the marking head 20 at a position where the light is blocked by the tire bead portion Tb. At this point, the angle sensor 24 measures the angle of the stamping surface and the distance to the stamping surface.

This measured value is input to an arithmetic circuit, which will be described later, and is converted into the position of the marking swing center in the tire width direction and the position of the mark punch 21 in the tire radial direction. This output and the position detectors 13 and 2 in each of the above directions
The outputs of 2 are compared, and the mark is engraved by moving the mark using the motors 11 and 17 so that the values match.

Here, the distance in the tire radial direction between the tire bead portion Tb detection photoelectric switch 25 and the angle sensor 24 is:
It takes a generally determined value equal to the distance from the inner diameter of the bead to the mark embossing point.

FIG. 5 also shows the positional relationship of the angle sensor 24, tire T, marking arm 6, etc.
The meanings of the symbols at each point are as follows.

P...The origin of the longitudinal axis and vertical axis during measurement, M...The stamping point, G...The origin of the longitudinal axis and the vertical axis during stamping A...The vertical line to the stamping point surface and the extension line of the punch tip surface 21a Intersection B...The intersection between the position L... of the angle sensor 21 when measuring the longitudinal axis and the extended line of the punch tip surface 21a, and the angle Lα... formed by the intersection Lθ... of the extended line with the extended line of D... is the vertical line. Angle formed by a...Distance between the punch tip surface 21a and the angle sensor 24 k...Distance between the punch 21 and the angle sensor 24 u...Distance between the angle sensor 24 and the photoelectric switch 25 Of the above distances and angles between points, the angle sensor 24 outputs the values of Lθ and +a, and a, Lα, , k, and u are determined from the mechanical positional relationship. Also, can be determined from the position detector 22.

Therefore, these known quantities: Lθ, Lα,
By finding and from LAMD(=R), , the coordinates of points G and M can be found. The mark punch 21 can be accurately moved to the marking point M by the distance u.The formula for determining the above and is as follows.

= tanθ = /cosθ = /sinθ = cotθ = +tanα = sinθ = (--) sinθ = /cos (θ-α) = tan (θ-α) = /cosα = cosθ = (--)cosθ ∴ = +, =-- Figures 6 and 7 show the principle and structure of the angle sensor 24, where 26 and 27 are phototransistors (hereinafter referred to as phototransistors 26 and 27), 28 is an LED,
31 is Phototra 26, 27 and LED 28
29 is a case, and 30 is a lens. The operation of this angle sensor 24 will be described below.

When a chipper output is applied to the LED of 28, it emits light, and the reflected light from the object to be measured is
The light is received at 7. Since phototracers 26 and 27 are each installed at a constant angle to the vertical line,
When the angle of the object to be measured changes, the ratio of the respective amounts of received light changes. However, since the amount of received light also changes depending on the distance between the angle sensor 24 and the object to be measured, the following equation is calculated in the electric circuit E connected thereto, and the angle output is obtained. Here, the distance between the phototracers 26 and 27 is set to be sufficiently shorter than the distance from the tire T.

Angle output = (Output of phototransistor 26 - Output of phototransistor 27)/(Output of phototransistor 26 + Output of phototransistor 27) Here, since the chopper output is supplied to the LED 28, the phototransistor output is also applied with a chopper. By AC coupling and rectifying this, the influence of ambient light is gradually removed.

On the other hand, if we pay attention to the received light output of the photodetector 27, the output changes depending on the amount of received light and the angle, so the output of the photodetector 27 is corrected using the angle obtained above to obtain the distance between the object to be measured and the angle sensor 24. ing.

FIG. 8 is a block diagram of the electric circuit EL of this marking device, in which the distance from the input of the angle sensor 24 to the tire T and the angle of the surface of the tire T are calculated by the sensor and the electric circuit E, and the position calculator 32 Enter.

On the other hand, the positions of the marking head 20 on the vertical and longitudinal axes are input to the position calculator 32 from the vertical position detector 13 and the longitudinal position detector 22. This position calculator 32 calculates the vertical and longitudinal coordinates at the time of stamping mentioned above and inputs them to a comparator 33.

The comparator 33 drives the vertical motor 11 and the longitudinal motor 17 so that there is no difference between the inputs from the vertical position detector 13 and the longitudinal position detector 22 and the coordinate input from the position calculator 32 at the time of stamping. Calculation in the electric circuit E of the angle sensor 24 explained above,
The calculations in the position calculator 32 and the calculations in the comparator 33 can be performed by independently assembling circuits as in this embodiment, but in an actual device, they can all be performed by a microcomputer.

When using a device configured in this manner to detect the engraving surface angle and the engraving point position and automatically set and engrave the marking position, the pressure of the air cylinder 14 must be kept constant at all times.

Therefore, assuming that the marking arm's own weight is balanced by a counterweight, the change in the pressing force for marking due to the change in the marking position is calculated using FIG. 9 as follows.

F′・a+R・l=M′(l−S) R=(l−S)M′/l−aF′/l R=M′−SM′/l−aF′/l l=l ₀ ,l =l ₁ = _0.9l Compare when 0 R ₀ =M′−SM′/l ₀ −aF′/l ₀ R ₁ =M′/SM′/0.9l ₀ −aF′/0.9l ₀ R ₀ − R ₁ = 0.11SM'/l ₀ +0.11aF'/l ₀ By the way, if S/l ₀ = 0.1 a/l ₀ = 0.25, then R ₀ - R ₁ = 0.011M' + 0.028F' R ₀ = 5Kg, M When '=10Kg, F=16Kg and R ₀ −R ₁ =0.56Kg.Furthermore, when the change in pressing force due to the difference in the marking arm swing angle and the marking embossing surface angle θ is calculated, it is as follows.

Fa′+Rl=Mcosθ(l−S) R=Mcosθ(1−S/l)−aF′/l R ₀ =Mcosθ ₀ (1−S/l)−aF′/l R ₁ =Mcosθ ₁ (1− S/l)−aF′/l R ₀ −R ₁ =M(1−S/l)(cosθ ₀ −cosθ
₁ ) Since θ is generally 15° to 25°, θ ₀ = 15, θ
₁ = R ₀ - R ₁ = M (1-S/l) x 0.06 M = 10 Kg Substituting S/l = 0.1, R ₀ - R ₁ = 0.54 Kg Therefore, marking arm swing angle marking embossing surface The change in the pressing force of the angle α between the air cylinder and the marking arm due to the difference in angle θ is calculated as follows.

Fcosα+Rl=M'(l-S) R=M'-SM'/l-SFcosα/l R ₀ =M'-SM'/l-SFcosα ₀ /l R ₁ =M'-SM'/l-SFcosα ₁ /l R ₀ = R ₁ = -SF/l (cos α ₀ - cos α ₁ ) When θ = 15° to 25°, α = 15° to 5° change R ₀
−R ₁ = +SF/l×0.03 S/l=0.1 Substitute F=16Kg R ₀ −R ₁ =0.05Kg From the above, within the range of regular use, mark the position change and angle change of the mark punch in the tire radial direction. The effect on the punch pressing pressure is about 20% of 1.1 kg, which is within a range that does not affect the actual use of the air cylinder 14.

In the above-described embodiment, the angle sensor 24 is used to bring the tip surface 21a of the mark punch 21 into vertical contact with the tire T, but about three pressure sensors are installed on the tip surface 21a of the mark punch 21. It is also conceivable that the front end surface 21a is brought into contact with the tire T perpendicularly by controlling the output so that the output is uniform.

In this invention, the base end of the marking arm having the marking head rotatably attached to the tip thereof is attached to be swingable and rotatable in the radial direction of the tire, and the center of swing of the marking arm is set to the marking head. Because it is formed on the same plane as the tip of the mark punch on the head, marking work can be done without the need for manpower, especially when using the deflate marking method, and marking errors are significantly reduced and mark transfer is possible. This has the effect of improving efficiency.

Moreover, since the structure is simple, it can be manufactured at low cost and maintenance is also easy.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a uniform machine implementing the marking device of the present invention, Fig. 2 is an enlarged side view of the marking device, Fig. 3 is a diagram of the operating state of the marking device, and Fig. 4 is a diagram of the marking device. An explanatory diagram at the time of stamping, FIG. 5 is a diagram showing how the angle sensor and photoelectric switch are attached to the marking head, and an explanatory diagram showing the positional relationship between the marking head and the tire stamping point. An angle sensor circuit diagram for extracting angle output and distance output, FIG. 7 is a view taken along the line PP in FIG. 6,
FIG. 8 is a block diagram of the electric circuit portion of this marking device, and FIG. 9 is a positional relationship diagram of the marking arm. 2... Conveyor conveyor, 6... Marking arm, 6a... Base end, 7... Swing center (pin),
20... Marking head, 21... Mark punch, 21a... Tip surface, T... Tire.

Claims (1)

[Claims] 1. The base end of a marking arm with a marking head rotatably attached to the tip is attached so as to be swingable and rotatable in the radial direction of the tire, and the center of swing of the marking arm is aligned with the mark punch end surface of the marking head. A tire marking device located in the same plane.