JPH0261537A - Tester for gold shaft - Google Patents

Abstract

PURPOSE:To achieve an automatic measurement of a kickpoint and a hardness of a golf shaft simultaneously and accurately by applying a fixed displacement perpendicular to an axis of the gold shaft continuously in an axial direction of the gold shaft. CONSTITUTION:Fulcrums 25 and 26 are arranged separated at a distance shorter than the length of a gold shaft. A fulcrum 27 is arranged movable freely between the fulcrums 25 and 26 in a direction roughly parallel with a straight line passing the fulcrums 25 and 26 and at the right angle thereto through a motor 28 and a cylinder 30. The position of the fulcrum 27 in a direction parallel with the straight line passing through the fulcrums 25 and 26 is detected with an encoder 29 while a reaction working on the fulcrum 27 is detected with a load cell 32 provided in a reaction detecting unit 31. Then, a controller 33 moves the fulcrum 27 continuously with the motor 28 keeping it 27 displaced at a fixed distance by the cylinder 30 and a reaction detected with the load cell 32 and a position done with the encoder 29 are shown on a display device 34 while recorded on an X-Y recorder 35. Thus, from the results of recording, a position of a kickpoint to minimize the reaction is extracted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a golf shaft testing device capable of measuring the kick point and its hardness.

(Prior Art) Traditionally, when the shaft of a golf club swings,
A certain point on the tip side (hereinafter referred to as the kick point)
centering on, it deforms and vibrates back and forth in the swing direction,
It is also known that the frequency of vibration is proportional to the hardness of the golf shaft at the kick point if the positions of the kick points are the same.

Also, when hitting a golf ball using a golf club,
The tip side of the shaft of the golf club hits the golf ball while deforming in the opposite direction to the swinging direction, and the golf ball receives kinetic energy due to the swing of the golf club as well as kinetic energy due to restoration of the deformation on the tip side. It is known that the greater the amount of deformation (displacement) on the tip side and the shorter the recovery time, that is, the higher the frequency, the better the golf ball will fly.

The softer the shaft, the larger the amount of displacement, but the frequency becomes lower accordingly, and the closer the position of the kick point is to the tip, the higher the frequency, but the amount of displacement becomes smaller accordingly. Therefore, if the kick point is at an appropriate position near the tip and the golf shaft is soft, that is, the golf shaft is softer toward the tip, the golf ball will fly better.

FIG. 2 shows an example of a conventional kick point measuring device.
By sandwiching the golf shaft A between a pressing member 4 provided at the other end so as to be movable in the direction of the locking member 2 via the feed screw 3, and turning the handle 5 provided on the feed screw 3, The pressing member 4 is moved in the direction of the locking member 2 to apply a load in the axial direction of the golf shaft A to curve the golf shaft A by a predetermined amount or more.
The apex A' of the deflection occurring in the kick point was set as a kick point, and its position was visually observed.

FIG. 3 shows an example of a conventional golf shaft hardness measuring device, in which a support 7 is fixed to one end of a pedestal 6.
One end (here, the tip) of the golf shaft A is brought into contact with the lower surface of the fulcrum 8 attached to the fulcrum 8, and the middle of the golf shaft A is attached to the upper surface of the load detection device 10 attached to another support 9 fixed to the frame 6. The golf shaft A is further curved and brought into contact with the lower surface of the fulcrum 12 attached to another support 11 fixed to the pedestal 6. At this time, the load detection device 10 detects the A force, that is, a force generated when the golf shaft A is displaced by a certain amount (hereinafter referred to as a reaction force).

) represents the hardness of the golf shaft A.

Also, Figure 4 shows the hardness of conventional golf shafts. This shows another example of the #J fixing device, in which one end of the golf shaft A, here the rear end, is brought into contact with the lower surface of the fulcrum 15 and the upper surface of the fulcrum 16, which are attached to the support 14 fixed to the pedestal 13. The golf shaft A is supported in a substantially horizontal state, and a weight 17 of a certain amount ff1G is suspended at a position separated by a certain distance from the position supported by the fulcrum 16 on the distal end side of the golf shaft A. , the displacement ff1D generated at the tip of the golf shaft A was defined as n1, and this was used to express the hardness of the golf shaft A.

(Problem to be Solved by the Invention) However, in the device shown in FIG. 2, the recognition of the position of the kick point relies on the visual observation n1 of the person taking the measurement, so errors occur in the measurement results depending on the position of the person's line of sight. In addition, in the device shown in Fig. 3, the fulcrum 8,
12 and the load detection device 10 were fixed, it was not always possible to detect the hardness at the kick point.
In addition, although the device shown in Figure 1 is similar, it has the disadvantage that the work is dangerous because the golf shaft must be bent manually, and in the device shown in Figure 4, the golf shaft A is bent. In this case, the disadvantage is that accurate measurement results cannot be obtained because a constant weight flG is not applied in a direction perpendicular to the axis, and in addition, all of these devices measure the kick point and its hardness at the same time. The problem was that it could not be done.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an apparatus that can simultaneously and accurately determine the kick point and hardness of a golf shaft without requiring any manual labor.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides first and second golf shafts arranged at a distance slightly shorter than the length of the golf shaft.
and a third fulcrum supported movably between the first and second fulcrums in a direction substantially parallel to a straight line passing through the first and second fulcrums and in a direction substantially perpendicular to the straight line. , 3rd
a first driving means for moving a fulcrum in a direction substantially parallel to the straight line; and a second driving means for displacing a third fulcrum by a certain distance from a state where it does not intersect with the straight line to a direction substantially perpendicular to the straight line. a driving means, a position detecting means for detecting the position of the third fulcrum in a direction substantially parallel to the straight line, a reaction force detecting means for detecting a reaction force applied to the third fulcrum, and a second driving means. While displacing the third fulcrum a certain distance,
a reaction force measuring means for continuously moving the third fulcrum by the first driving means, during which time the reaction force detected by the reaction force detection means is recorded together with the position detected by the position detection means; A golf shaft testing device comprising: kick point measuring means for extracting the position of the kick point where the reaction force is the smallest from the force recording results; in the device, while the third fulcrum is moved by the first driving means;
Reaction force detection means for intermittently displacing the third fulcrum a certain distance by a second driving means and recording the reaction force detected by the reaction force detection means at that time together with the position detected by the position detection means; , a device equipped with a kick point measuring means for calculating the position of the kick point where the reaction force is the smallest from the intermittent recording results of the reaction force, or in these devices, the distance between the first and second supporting points can be changed. The present invention proposes an apparatus in which the first or second fulcrum can be moved in a direction substantially parallel to the direction of displacement by the second driving means.

(Function) According to the present invention, the tip and rear ends of the golf shaft are connected to the first
and the second fulcrum respectively, and operate the reaction force measuring means and the kick point measuring means, the third fulcrum remains displaced a certain distance by the second driving means, and the ml
is continuously moved by the driving means of the golf shaft, whereby a constant displacement in the direction perpendicular to the axis of the golf shaft is continuously applied in the axial direction of the golf shaft, and at this time, the third The reaction force applied to the fulcrum is detected by the reaction force detection means, this is continuously recorded by the reaction force measurement means together with the position of the third fulcrum detected by the position detection means, and further, based on the recorded result, the kick point measurement means detects the reaction force applied to the fulcrum. The position of the kick point where the reaction force, that is, the hardness is the smallest, is extracted.

Further, while the third fulcrum is being moved by the first driving means, the second driving means intermittently displaces the third fulcrum by a certain distance, and at this time, the reaction force detection means detects the A device comprising a reaction force measuring means for recording the reaction force together with the position detected by the position detecting means, and a kick point measuring means for calculating the position of the kick point where the reaction force is the smallest from the intermittent recording results of the reaction force. According to the method, the recording result of intermittent reaction force is obtained, and from the recording result, the position of the kick point where the hardness is the smallest is calculated using the kick point m foot means.

Further, according to the device in which the distance between the first and second fulcrums can be changed and the first or second fulcrum can be moved in a direction substantially parallel to the direction of displacement by the second driving means, The positions of the first and second supporting points can be optimally set according to the length of the golf shaft, and accurate illumination results can be obtained.

(Example) Fig. 1 shows an embodiment of the golf shaft testing device of the present invention, in which 21 is a frame, 22° 23 and 24
is a column, 25, 26 and 27 are fulcrums, 28 is a motor, 2
9 is an encoder, 30 is a cylinder, 31 is a reaction force detection unit, 32 is a load cell, 33 is a control device, 34 is a display, 35 is an XY encoder, and 36 is a display.

The column 22 is fixed to one end of the pedestal 21, a fulcrum 25 is attached to the upper part of the column, and an abutting plate 4 is attached to the negative side of the column 22.
1 is installed. The support column 23 is made up of two members 23a and 23 that are telescopically connected to each other by screws.
A fulcrum 26 is attached to the upper member 23a, and a feed screw 43 rotated by a handle 42 is inserted into the lower member 23b, and is movable horizontally on the pedestal 21. is set up.

Further, a cylinder 30 and a reaction force detection unit 31 are attached to the upper part of the column 24, and a motor 2 is attached to the lower part of the cylinder 30 and a reaction force detection unit 31.
A ball screw 44 rotated by 8 is fitted and inserted into the frame 2.
1 so that it can move freely in the horizontal direction. The reaction force detection unit 39 includes a pair of guides 45 and a stopper 4.
6, it is possible to move only a certain distance in the vertical direction with respect to the support column 24, and its driving is performed by a cylinder 30. Further, a fulcrum 27 is attached to the reaction force detection unit 39 so as to be slightly movable downward.
A load cell 32 is fixed above.

Note that each of the fulcrums 25, 26 and 27 is made of a substantially cylindrical rigid body, and is arranged so that its axes are horizontal and parallel to each other.

The control device 33 controls the motor 28 according to a predetermined program to drive the column 24 in the horizontal direction, and also controls the cylinder 30 to drive the reaction force detection unit 31 in the vertical direction. That is, the horizontal position of the fulcrum 27 is detected, and the load cell 32
Detect the reaction force, store the result, and use the XY recorder 3.
5, the minimum value of the reaction force is extracted and displayed on the display 34 together with its position. Note that various information regarding the operation of the control device 33 is displayed on the display 36.

FIG. 5 shows the flow of the program in the control device 33, and the method of using the device and its operation will be explained below according to this flow. Initially, the reaction force detection unit 31 is located at the uppermost position. shall be.

First, the golf shaft A to be tested is placed such that its distal end surface is in contact with the abutting plate 41 and its lower surface is at the fulcrum 2.
5, and set so that the lower surface of the - on the rear end side contacts the fulcrum 26.

Next, by operating the handle 42, the horizontal position of the fulcrum 26 is aligned with the length of the golf shaft A (
Specifically, the lower end of the grip part and the fulcrum 2 when it is commercialized.
6), and further adjust the height of the fulcrum 26, that is, the height of the support 23, so that the upper surface of the golf shaft A in this state is horizontal.

Next, when the control device 33 is commanded to start the test from a switch or keyboard (not shown), the control device 33 moves the support column 24 to the test start position (the far right side in the drawing) based on the output of a limit switch (not shown), etc. If it is not at the test start position, the motor 28 is moved in the direction to position the support 24 at the test start position.
is rotated (step s2), and when the support column '24 reaches the test start position, the motor 28 is stopped (step s3).

Next, the control device 33 operates the cylinder 30 (step S4), moves the reaction force detection unit 31 downward by a certain distance, gives a predetermined amount of displacement to the golf shaft A, and rotates the motor 28 in the forward direction (step S4). s5), pillar 24
That is, the fulcrum 27 is moved leftward at a constant speed.

At this time, the control device 33 controls the load cell 32 based on the information regarding the position of the fulcrum 27 output from the encoder 29.
The information regarding the reaction force output from the controller is continuously read (step S6) and stored in a storage section (not shown).

Further, when the control device 33 detects that the support column 24 has reached the test end position (the leftmost position in the drawing) based on the output of other limit switches (not shown), the control device 33 controls the cylinder 30. At the same time, the motor 28 is stopped (step s8).

Thereafter, the control device 33 extracts the smallest value from the stored reaction force information (step s9), displays this on the display 34 together with its position, that is, the position of the kick point (step 51O), and further extracts all the reaction force information. Step 5
11) A curve showing the change in reaction force, that is, the hardness of the golf shaft A, is recorded.

Note that the position information output from the encoder 29 is
4 (or the fulcrum 27), and does not accurately indicate the position of the golf shaft that is curved during the test. However, since the amount of displacement given to the golf shaft is constant, By determining the relationship between the position from the tip of the shaft and the position information output from the encoder 29 by actual measurement or approximate calculation, and creating a table, the position information output from the encoder 29 can be immediately adjusted to the tip of the golf shaft. The location can be converted from

Further, recording by the XY recorder 35 may be performed simultaneously while the fulcrum 27 is moving.

Further, in the embodiment, while the cylinder 30 is in operation,
Although the motor 28 is configured to rotate continuously, it is possible to obtain intermittent reaction force information by repeatedly operating and restoring the cylinder 30 each time the motor 28 is rotated by a predetermined amount, that is, the fulcrum 27 is advanced by a predetermined amount. You can try to get it.

In this case, less fatigue occurs and remains in the golf shaft than in the case of the above embodiment, so more accurate values can be obtained for each piece of information, but it is difficult to know that the measured position and the kick point position match. Therefore, in order to actually measure the position of the kick point, it is necessary to perform approximation processing using a well-known quadratic function. The flow of the program in this case is shown in FIG.

(Effects of the Invention) As explained above, according to the present invention, the golf shaft to be tested is simply set on the first and second supporting points, and then the golf shaft 14 is automatically displaced by a predetermined amount. The reaction force in a state where the kick point is held is continuously measured along with its position, and the position of the kick point where the reaction force is the minimum is extracted, so the kick point position and its hardness can be measured simultaneously, reducing the time required for testing. It is possible to obtain accurate test results without risking danger to the person performing the measurement, and without causing any errors due to the person determining the flFJ. Further, according to the present invention,
Since the displacement is applied intermittently, the fatigue generated and remaining in the golf shaft is reduced, and the reaction force, that is, the hardness can be measured more accurately.

Furthermore, according to the present invention, the distance between the first and second fulcrums and the height of the fulcrums can be adjusted, and there are advantages such as being able to always perform accurate tests depending on the type of golf shaft. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the golf shaft testing device of the present invention, Fig. 2 is a block diagram showing an example of a conventional golf shaft kick point n1 constant device, and Fig. 3 is a block diagram showing an example of a conventional golf shaft testing device. FIG. 4 is a block diagram showing another example of a conventional golf shaft hardness measuring device; FIG. 5 is a flowchart of a program in the control device in FIG. 1; FIG. 6 is a flowchart of another program in the control device in FIG. 21... Frame, 22, 23. 24... Support, 25° 26.27... Fulcrum, 28... Motor, 29...
Encoder, 30...Cylinder, 31...Reaction force detection unit, 32...Load cell, 33...Control device, 34...Display device, 35...XY encoder 36.
...Display.

Claims (3)

[Claims] (1) First and second fulcrums arranged at a distance slightly shorter than the length of the golf shaft, and approximately parallel to a straight line passing through the first and second fulcrums between the first and second fulcrums. a third fulcrum supported movably in a direction substantially perpendicular to the straight line and a direction substantially perpendicular to the straight line; a first driving means for moving the third fulcrum in a direction substantially parallel to the straight line; a second driving means that moves from a state where it does not intersect with the straight line to a direction that intersects with the straight line and displaces it a certain distance; and a position detecting means that detects the position of the third fulcrum in a direction that is approximately parallel to the straight line. and a reaction force detection means for detecting a reaction force applied to the third fulcrum, and a means for moving the third fulcrum by the first driving means while the third fulcrum is displaced by a certain distance by the second driving means. Reaction force measuring means that moves continuously and records the reaction force detected by the reaction force detection means together with the position detected by the position detection means, and a kick point where the reaction force is the smallest based on the recording result of the reaction force. A golf shaft testing device comprising a kick point measuring means for extracting the position of the golf shaft. (2) While the third fulcrum is being moved by the first driving means, the second driving means intermittently displaces the third fulcrum by a certain distance, and at that time, the reaction force detection means detects the the kick point measuring means for calculating the kick point position at which the reaction force is the smallest from the intermittent recording results of the reaction force. The golf shaft testing device according to claim 1, characterized in that: (3) The distance between the first and second supporting points can be changed, and the first or second supporting point can be moved in a direction substantially parallel to the direction of displacement by the second driving means. The golf shaft testing device according to claim (1) or (2).