JPS5993343A - Marking device for tire - Google Patents

Abstract

PURPOSE:To obtain a marking device capable of giving a mark with a high mark transfer efficiency and with low mark mal-discrimination and without the needs for a hand in marking operation of a deflate marking method. CONSTITUTION:The basal end 6a of an arm 6 whose tip is rotatably attached with a marking head 20 is attached in a rocking and turnable manner to the diametrical direction of a tire T. The rocking center of the arm 6 is positioned on the same plane as the tip end of the mark punch 21 of the marking head 20. In marking, a tire T is first set on a feed conveyer 2, an air cylinder 14 is contracted, the arm 6 is turned around the pin 7, and the mark punch 21 is pressingly contacted with a desired position of the tire T.

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. The present invention relates to a marking device.

Conventionally, this type of device has two methods: the inflated marking method, in which the tire is chucked onto the main shaft rim of a uniformity machine, and a mark is stamped on the tire while internal pressure is applied; A deflate marking method is known in which marks are stamped on tires on a conveyor.

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 uniformity machine cycle, and the latter deflate marking method is unfavorable in terms of uniformity measurement ability. Since time is not included in the uniformity measurement time, this method 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 be pressed perpendicularly to the surface, that the pressing force be appropriate, and that the mark punch surface temperature be 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 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. Pressing the mark punch sometimes deforms the tire, causing the contact point between the mark punch and the tire to shift, often resulting in defective mark transfer.

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 marking of the mark punch are Even if the surfaces match, the mark punch suppression direction is not perpendicular to the tire surface.
Pressing a mark punch has the disadvantage that the contact point between the mark punch and the tire surface shifts due to tire deformation over time, resulting in poor mark transfer.

In addition, 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, moving part weight 30 to 7, pressing force 5Kg±l K7
In this case, the adjustment of the air pressure of the air cylinder is 1/35
accuracy is required.

In addition, in both the inflated marking method and the deflated marking method, the position of the marking point in the radial direction of the tire and the marking surface angle of the mark punch vary randomly because they are adjusted manually for each size. Marking tires for size was virtually impossible.

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 attaches the base end of a marking arm having (3) a marking head rotatably attached to the tip thereof so as to be swingable and rotatable in the radial direction of the tire, so that the marking arm swings. The gist is that the center is located in the same plane as the tip end surface of the mark punch of the marking head.

The present invention will be described in detail 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, in which 1 is a frame of the uniformity machine, 2 is a roller transport conveyor (hereinafter referred to as transport conveyor) for transporting tires T, and 6 Reference numeral 4 denotes an inflated marking device installed in the pedestal 1, and 4 is a deflated marking device attached to the frame 5 of the pedestal 1 on one side of the conveyor 2.

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

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

Moreover, between the table 8 and the marking arm 6,
An air cylinder 14 that swings the marking arm 6 in the radial direction of the tire T using the pin 7 as a fulcrum is connected to the pin 15a,
15b.

A feed screw 16 is arranged 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 into the screw 16 is configured to slide along the longitudinal direction of the marking arm. A marking head 20 equipped with a mark punch heater (not shown), a mark punch selection rotary device, and a mark tape feeding device is attached to the nut 18 screwed onto the feed screw 16 via a guide member 19, A mark punch 21 rotatable in the radial direction of the tire T is attached to the king head 20.

Further, a position detector 22 for detecting the position of the marking head 20 is attached to the guide member 19.

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 distal 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 are aligned 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. There is.

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

First, the tire T is set on the conveyor 2, and then the air cylinder 14 is contracted to rotate the marking arm 6 clockwise in FIG. 3 about the pin 7 as a fulcrum.
Press the mark punch 21 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 the mark punch 21 is in perpendicular contact with the surface of the tire T (see Figure 4).
. If the position and angle α are not appropriate, the air cylinder 14 is extended and the mark punch 21 is temporarily moved.
is separated from the tire surface S, and the motors 17 and 11 are driven to move the position of the marking head 20 and the position of the pin 7, which is the center of swing of the marking arm 6.

For example, if the pin 7 is pulled upward, the angle α between the direction of the stamping press of the mark button (7) 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 swing is raised upwards 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 adjusted again. However, the above adjustment is performed once for each tire T, and the position detector 13.2
If you read and record the position using step 2, you only need to set it 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, so that the transfer of the center part of the mark (8) is not sufficient. Furthermore, if the pressing force is small, the overall transfer will be insufficient.

By the way, since 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,
At any swing angle α, if the marking surface of the tire T and the mark punch tip surface 21a are aligned, the pressing direction of the mark punch 21 will always be perpendicular to the marking 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 angle 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 is the pressing force of the mark punch 21 on the tire T.
having a counterweight 26 that removes the weight of the marking arm 6; and a distance from the center of swing of the marking arm 6 to the point of action of the air cylinder 14;
Since the distance from the center of swing of the marking arm 6 to the mark punch 21 is as large as approximately ALL, the mark punch 21
The pressing force can be finely adjusted. For example, A/L=
1/4 ・Marking head weight 10 to 2 ・Press force of mark punch 5Kg±l When K and 9 are used, the air pressure adjustment of the air cylinder 14 has an accuracy of , which is much easier to adjust than the conventional 1/35. can be performed with high precision.

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 the photoelectric switch 25, first the marking head 20
is 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. The movement of the marking head 20 is stopped at a point where the photoelectric switch 25 is blocked from light 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 is compared with the outputs of the position detectors 16 and 22 in each direction, and the mark is engraved by moving the mark using the motors 11 and 17 so that the values match.

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

FIG. 5 also shows the positional relationship of the angle sensor 24, tire T, marging arm roller, etc. (11) The meanings of the symbols at each point are as follows.

P...Origin of the longitudinal axis and vertical axis during measurement, M...Emphasis point, G...Origin of the longitudinal axis and vertical axis during engraving A...Plumb line and punch against the engraving point surface Intersection B of the extension line of the tip surface 21a...Position L of the angle sensor 21 when measuring the longitudinal axis...
・Intersection between BM and the extension line of the punch tip surface 21a, D...
Intersection point Lθ of the extension line of AL and extension line of I...Angle LC between AD and Ugly...Angle a that PG makes with the vertical line...Distance k between the punch tip surface 21a and the angle sensor 24...・Distance U between punch 21 and angle sensor 24...
Distance between the angle sensor 24 and the photoelectric switch 25 Among the above-mentioned point-to-point distances and angles, the distance between the angle sensor 24 and the photoelectric switch 25 is Lθ.
The values of ML and ML+a are output, and u is determined by a, LC, and BL from the mechanical positional relationship.

Further, PB can be obtained from the position detector 22 (12
) Wear.

Therefore, these known quantities; Lθ, LC, LAMT) (=
By finding the opening and ■ from R), lla, BL, and PB, the coordinates of the points G and M can be found, and the distance between this and the known mark punch 21 and the angle sensor 24, and the distance between the angle sensor 24 and the photoelectric switch. Distance u from 25
Thus, the mark punch 21 can be accurately moved to the marking point M.The formula for determining the above-mentioned value and MG is as follows.

AL = ML tanθ MA = ML / CO3θ anal 1/sinθ
C) sin θ cos;=-west I7 cos (θ-α) cos (θ-α) PC”= BL/cosα DE : CD CO3θ= (AD -AL -LC
) cos θ Figures 6 and 7 are angle sen-! j24 principle, °
It shows the structure, 26 and 27 are phototransistors (hereinafter referred to as phototransistors 26 and 27), 28 is an LED,
61 is the first tiger 26, 27 and LED 28
29 is a case, and 60 is a lens. The operation of this angle sensor 24 will be described below.

When a chopper output is applied to the LED 28, it emits light, and the reflected light from the object to be measured is received by the LEDs 26 and 27. Since the photo sensors 26 and 27 are each attached at a constant angle with respect to the vertical line, when the angle of the object to be measured changes, the ratio of the respective amounts of light received changes. However, since the amount of light received varies 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 to the angle sensor 24.
Angle output. Here, the distance between the seven tires 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) Since the chopper output is supplied to the LED 28, the chopper is also applied to the phototransistor output. There used to be. By AC coupling and rectifying this, the influence of the disturbance light is eliminated.

On the other hand, if we pay attention to the received light output of the first frame sensor 27, the output changes depending on the amount of light received and the angle. I'm trying to get some distance.

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 62 Enter.

On the other hand, the position of the marking head 20 on the vertical and longitudinal axes is input from the vertical position detector 16 and the longitudinal position detector 22 to the position calculator 62 . The position calculator 32 calculates the vertical and longitudinal coordinates at the time of stamping mentioned above and inputs them to the comparator 63.

The comparator 63 operates the vertical motor 11 and the longitudinal motor 17 so that there is no difference between the input from the vertical position detector 16 and the longitudinal position detector 22 and the coordinate input from the position calculator 62 at the time of stamping. drive Angle sensor 24 explained above
The calculations in the electric circuit E, the calculations in the position calculator 62, and the calculations in the comparator 66 can be performed even if the circuits are assembled independently as in this embodiment, but in an actual device, they are all performed by a microcomputer. Is possible.

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-4=M'(L-8) R-(1-S) M'/1-aF'/lR= M'-
8M/L -aF'/L (16) Compare when t=to, t=t, =o, 9to Ro=
Wf'-8M/lo aF'/l.

R,=M'-8K/0.9 Lo-aF'/0.
9t.

Ro-R,=0.118M/lo+0.11 a'F
'/L.

By the way, S/lo= 0.1 alto= 0.25
Then, I-R, = 0.011 M + 0.028 F'R
o ''' 5 Kg, M' = 10 Kp, F = 16, and R+ = 0.56 Kg.Also, the change in pressing force due to the difference in the marking arm swing angle and the marking surface angle θ is The calculation is as follows.

F'a + R1= MCO3θ(z-8)R=MCO
3θ(1-S/l)-aF'/lRo=Mcosθ
O(IS/z) aF'/lR,=MCO5θ+
(1s/g-a'F'/IRo R,=M(1-8/
1) (cos θ.-cos θ1) Generally θ = 15° ~ 2
Since it is 5°, θ. =15. If θ,=, then Ro-R,=M(1-8/l) X 0.06M=10
Substituting 9S//, = 0.1 into Ro-R, =
0.54. Ky Therefore, the change in the pressing force of the angle α between the air cylinder and the marking arm due to the difference in the marking arm swing angle and the marking face angle θ is calculated as follows.

1i'cosα+Rt=M'(t-8)R==4-
8Mn/lS FCO5α/1Ro=lVf'-SW/
l −S Fcosαo/lR,=Mj−SM/l−8
FCO8α, /1Ro−R+= −SF/L (cos
αo-cos α1) When θ-15°~25° α-15°~
Approximately 5° change Ro-R, -10SF/l x 0.03S
/l = 0.1 F = 16 Substitute Kf R
o-R, = 0.05 Kg From the above, in the range of regular use, the influence of the position change of the mark punch in the tire radial direction and the angle change on the mark punch pressing pressure is about 11 ICP, about 20 coefficient, and the air This is a range that does not affect the actual use of the cylinder 14.

In addition, in the embodiment described above, the tip surface 2 of the mark punch 21
The angle sensor 24 is used to bring the tire T into vertical contact with the tire T, but it is not marked.

Approximately three pressure sensors are provided on the tip surface 21a of the punch 21, and the pressure sensors are controlled so that their outputs are evenly distributed.
A method of bringing 1a into contact with the tire T perpendicularly is also considered.

In this invention, the base end of the marking arm, which has the marking head rotatably attached to the tip as described above, is attached to be swingable and rotatable in the radial direction of the tire, and the center of motion of the marking arm is set as above. Because it is formed in the same plane as the mark punch tip surface of the marking head,
Particularly in the deflate marking method, it is possible to operate the marking device without the need for manpower, and there is an effect that mistakes in mark discrimination can be significantly reduced and mark transfer efficiency can be improved.

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

[Brief explanation of the drawing]

(19) Fig. 1 is an overall configuration diagram of a uniformity machine implementing the marking device of the present invention, Fig. 2 is an enlarged side view of the marking device, and Fig. 3 is a diagram of the operating state of the marking device.
Fig. 4 is an explanatory diagram of the marking device during stamping, and Fig. 5 is a diagram showing how the angle sensor and photoelectric switch are attached to the marking head, and an explanation showing the respective positional relationships between the marking head and the tire stamping points. Fig. 6 is an angle sensor and an angle sensor circuit diagram for taking out the angle output and distance output, Fig. 7 is a view taken along the line P-P in Fig. 6, and Fig. 8 is an electrical diagram of the marking arm. A block diagram of the circuit portion, and FIG. 9 is a positional relationship diagram of the marking arm. 2...Conveyor conveyor, 6...Marking arm, 6a
... Base end part, 7 ... Swing center (bottle), 20 ...
Marking head, 21... Mark punch, 21a.
...Tip surface, T...tire. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita (20)

Claims (1)

[Claims] The base end of a marking arm, which has a marking head rotatably attached to its tip, is attached so as to be able to swing and rotate in the radial direction of the tire, and the center of swing of this marking arm is aligned with the tip end surface of the mark punch of the marking head. A tire marking device located within a plane.