JP3953200B2 - Grinder skim adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a skim adjusting device that determines a reference position for cutting in a tire uniformity correction device that corrects uniformity by grinding an outer peripheral surface of a tire.
Here, the skim adjustment means that a reference position serving as a reference for a cutting amount by the grinder grindstone is determined.
[0002]
[Prior art]
In the conventional tire uniformity correction, the reference position of the grinder grinding wheel incision with respect to the tire is determined, that is, the skim adjustment is such that a contactor such as a paddle or a ball point having a fixed positional relationship with the grinding wheel is in contact with the outer peripheral surface of the tire. This was done by the operator confirming it visually.
[0003]
[Problems to be solved by the invention]
Since the operator confirms with eyes, the skim adjustment cannot always be performed accurately, and a stable adjustment cannot be expected due to a difference between workers.
In addition, the worker had to be attached to the tire uniformity correction device for skim adjustment, which required time and labor.
[0004]
The present invention has been made in view of the above points, and the object of the present invention is to provide a skim adjusting device for a grinder that can always automatically perform stable skim adjustment.
[0005]
[Means for solving the problems and effects]
In order to achieve the above object, the present invention provides a tire uniformity correction device that performs grinding uniformity by moving a grinder grindstone rotating on the outer peripheral surface of a tire closer to a grindstone moving means to detect rotation of the grinder grindstone. A wheel for detecting the relative position of the grinder grindstone with respect to the tire, and a wheel for rotating the grinder grindstone by controlling the grindstone moving means to bring the grinder grindstone closer to the outer peripheral surface of the tire at a low speed A reference position for cutting based on the position of the grinder grindstone detected by the grindstone position detecting means when the rotation detecting means detects the rotation of the grinder grindstone by touching the rotating tire. Grinder skim adjustment device with skimming means for determining .
[0006]
When the grinder grindstone is brought close to the rotating tire at a low speed, the grinder grindstone starts rotating by contact friction when the grinder grindstone comes into contact with the outer peripheral surface of the tire, so when the rotation detection sensor detects this rotation The relative position of the grinder grindstone is detected by the grindstone position detecting means, and the skimming means determines the reference position for cutting based on this detected position, and the skimming is adjusted.
[0007]
The delicate position where the grinder grindstone comes into contact with the tire can be automatically detected, and the reference position of the incision is determined based on the detected position. Therefore, accurate skim adjustment can always be automatically performed, and the labor of the operator can be reduced.
[0008]
According to a second aspect of the present invention, in the skimmer adjusting apparatus for the grinder according to the first aspect, the grindstone position detecting means has a fixed positional relationship with the grinder grindstone as a relative position of the grinder grindstone, and is on the outer circumferential surface of the tire. It is characterized by detecting the movement of the paddle in contact.
[0009]
Since the paddle that detects the condition of the tire surface is in a fixed positional relationship with the grinder wheel, the movement of the paddle that contacts the tire corresponds to the relative position of the grinder wheel with respect to the tire, so skim adjustment can be detected by detecting the paddle movement. Can be done based on value.
[0010]
According to a third aspect of the invention, in the grinder skim adjusting device according to the first or second aspect, the skim means slightly returns from the relative position of the grinder grindstone detected at the time when the rotation of the grinder grindstone is detected. This position is used as a reference position for cutting.
[0011]
Grinding control is facilitated by adjusting the skimming position so that the position slightly retracted from the position at which the grinder grindstone starts rotating by bringing the grinder grindstone closer to the tire and touching the tire is set as the reference position for cutting.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the tire uniformity correcting device 1 according to the present embodiment, a servo motor 4 is installed on a support frame 3 installed on a column 2 and is connected to a drive shaft protruding downward from the servo motor 4 so that an upper rim shaft 5 is connected. The lower rim shaft 6 is provided so as to be movable up and down coaxially below it.
[0013]
The tire T carried into the tire uniformity correcting device 1 is sandwiched between the lower rim of the upper rim shaft 5 which the lower rim shaft 6 ascends and is supported by the upper rim and is further elevated. Is supported at a predetermined height in a horizontal posture.
The tire T sandwiched between the upper rim shaft 5 and the lower rim shaft 6 by the drive of the servo motor 4 rotates while maintaining a horizontal posture.
[0014]
The support column 2 is provided with a pair of upper and lower grinder mechanisms 10 symmetrically in the vertical direction.
The upper grinder mechanism 10 will be described with reference to FIGS. 1 and 2. A swing member 11 is supported by a bracket 2 a protruding from one support column 2 via a support shaft 12 so as to be swingable horizontally. The cylinder rod 15a of the servo cylinder 15 pivotally supported by the bracket 2b of the other support column 2 is pivotally attached to the swing member 11 so that the swing member 11 swings when the servo cylinder 15 is driven. It has become.
[0015]
A motor 16 is provided on the proximal end side of the swing member 11, and a chain 18 is provided between a sprocket that is supported by a grinder grindstone 17 on the distal end side and is fitted to the drive shaft of the motor 16, and the sprocket integrated with the grinder 17. The grinder grindstone 17 provided at the tip of the swinging member 11 is rotated by driving the motor 16.
A rotation detection sensor 19 is attached to the rotating shaft of the grinder grindstone 17 so that the rotation of the grinder grindstone 17 can be detected.
[0016]
A paddle 21 is pivotally supported by a support shaft 20 at a tip portion of the swing member 11 and is swingably provided. One end of the paddle 21 faces the tire T side and the other end is a swing member. The differential transformer 22 fixed to the tip of 11 is connected to the tip of the operating shaft 22a.
Therefore, the swinging posture of the paddle 21 is detected by the differential transformer 22.
[0017]
The paddle 21 is provided so as to always contact the outer peripheral surface of the tire T and monitor the surface state during grinding, but is used for skim adjustment in the present embodiment.
The grinder grindstone 17 and the paddle 21 are pivotally supported by the end portion of the same swinging member 11 and are fixed in a certain positional relationship, and the swinging member 11 swings toward and away from the tire T together.
[0018]
When approaching the tire T, the tip of the paddle 21 first comes into contact with the tire T and starts swinging, and then the grinder grindstone 17 comes into contact.
The detection value of the differential transformer 22 that detects the swinging posture of the paddle 21 corresponds to the relative position of the grinder grindstone 17 with respect to the tire T.
[0019]
The swinging member 11 can be moved up and down somewhat, and the vertical position of the grinder grindstone 17 can be adjusted by moving up and down with the grinder driving mechanism by driving the lifting motor 25.
[0020]
Therefore, the grinder grindstone 17 is set at a required height position with respect to the rotating tire 2 held in a horizontal posture on the upper and lower rim shafts 5 and 6, and the rocking member 11 is swung by the servo cylinder 15 to rotate. 17 can be applied to the required portion of the tire T and cut for uniformity.
[0021]
The upper grinder mechanism 10 receives the upper half of the tire T in a horizontal posture, and the grinder mechanism 10 provided symmetrically on the lower side receives the lower half of the tire T.
[0022]
FIG. 3 shows a schematic block diagram of a control system of the grinder mechanism 10 having the above structure.
The tire uniformity correction control is performed by the computer 30. The computer 30 inputs the detection signals of the differential transformer 22 and the rotation detection sensor 19 to rotate the tire T and the servo motor that brings the grinder grindstone 17 closer to the tire T. Drive 15 is controlled.
[0023]
The skim adjustment control executed at the beginning of uniformity correction in this control system will be described with reference to the flowchart of FIG.
First, the servo motor 4 is driven to rotate the tire T (step 1), and then the servo cylinder 15 is driven to bring the grinder grindstone 17 together with the paddle 21 and the differential transformer 22 gradually toward the tire T at a low speed (step 2). ).
[0024]
First, the tip of the paddle 21 contacts the rotating tire T, and then the grinder grindstone 17 contacts.
When the grinder grindstone 17 comes into contact with the rotating tire T and the grinder grindstone 17 starts to rotate due to contact friction, the rotation detection sensor 19 detects the rotation of the grinder grindstone 17.
[0025]
Accordingly, in step 3, it is determined whether or not the rotation of the grinder wheel 17 by the rotation detection sensor 19 has been detected. The process returns to step 2 until the grinder wheel 17 is detected, and the grinder wheel 17 is brought closer to the tire T. Then, the detection value of the differential transformer 22 at that time is read.
[0026]
Then, based on the detected value of the differential transformer 22, the reference position for cutting is determined in the next step 5.
Here, a value obtained by subtracting a small predetermined amount from the detected value of the differential transformer 22 so as to correspond to a position where the grinder grindstone 17 which has started rotating close to the tire T is slightly retracted is used as a reference value to cut the same position. The reference position is determined, that is, skim adjustment is performed.
[0027]
Then, in the next step 6, the servo cylinder 15 is driven so that the detected value of the differential transformer 22 becomes the reference value, and the grinder grindstone 17 is set to the reference position.
Therefore, the reference position of the incision is a position slightly in front of the grinder grindstone 17 in contact with the tire T, and it is difficult for the operator to always check with the eyes accurately, but the grinder mechanism 10 is always accurate. Skim adjustment can be done automatically.
[0028]
Therefore, tire uniformity correction based on stable grinding with high accuracy is always automatically performed, and the labor of the operator can be reduced.
[0029]
In the above embodiment, since the relative position of the grinder grindstone 17 with respect to the tire T is detected using the paddle 22, there is no need to separately provide a dedicated grindstone position detecting means, and the number of parts can be reduced and the cost can be reduced. Can be achieved.
Needless to say, a dedicated grindstone position detecting means may be provided.
[0030]
Further, although the rotation detection sensor 19 is provided to detect the rotation of the grinder grindstone 17, a current generated in the motor 16 to which the rotation of the grinder grindstone 17 is transmitted may be detected.
[0031]
Although only the tire uniformity correction has been described above, the rotating drum is pressed against the tire T to measure the magnitude of fluctuation in the radial force of the tire RFV, the magnitude of fluctuation of the tire in the lateral direction (axial direction) LFV, etc. Tire uniformity measurements can be made simultaneously or separately.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part of a tire uniformity correcting device according to an embodiment of the present invention.
FIG. 2 is a plan view of the main part.
FIG. 3 is a schematic block diagram of a control system of the apparatus.
FIG. 4 is a flowchart showing a control procedure of skim adjustment control.
[Explanation of symbols]
T ... tyre,
DESCRIPTION OF SYMBOLS 1 ... Tire uniformity correction apparatus, 2 ... Support | pillar, 3 ... Support frame, 4 ... Servo motor, 5 ... Upper rim shaft, 6 ... Lower rim shaft,
10 ... Grinder mechanism, 11 ... Oscillating member, 12 ... Support shaft, 15 ... Servo cylinder, 16 ... Motor, 17 ... Grinder grindstone, 18 ... Chain, 19 ... Rotation detection sensor,
20 ... support shaft, 21 ... paddle, 22 ... differential transformer, 25 ... motor,
30 ... Computer.

Claims (3)

In the tire uniformity correcting device that corrects the uniformity by grinding the grinder grindstone rotating on the outer peripheral surface of the tire closer to the grindstone moving means,
Rotation detection means for detecting rotation of the grinder grindstone;
A grindstone position detecting means for detecting a relative position of the grinder grindstone with respect to the tire;
Drive control means for controlling the grindstone moving means to bring the grinder grindstone closer to the outer peripheral surface of the tire at a low speed, and to touch the rotating tire with the grinder grindstone,
Skimming means for determining a reference position for cutting based on the position of the grinder grindstone detected by the grindstone position detecting means when the rotation detecting means detects rotation of the grinder grindstone by touching a rotating tire. Grinder skim adjusting device characterized by the above. 2. The grinder according to claim 1, wherein the grindstone position detecting means detects a movement of a paddle that is in a fixed positional relationship with the grinder grindstone as a relative position of the grinder grindstone and contacts the outer peripheral surface of the tire. Skim adjustment device. 3. The grinder according to claim 1, wherein the skim means sets a position slightly returned from a relative position of the grinder grindstone detected when the rotation of the grinder grindstone is detected as a reference position for cutting. Skim adjustment device.

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