TW201928297A - Bicycle frame measuring method having the characteristics of fast operation and high accuracy - Google Patents

Abstract

The present invention relates to a bicycle frame measuring method, including the following steps: first, fixing a bicycle frame to a working platform, and mounting a rear wheel axle fixture to a rear fork of the bicycle frame; using a front camera, an upper camera and a rear camera to respectively capture a front view image of a head tube, an upper view image of the rear wheel axle fixture and a rear view image of the rear wheel axle; analyzing the captured images to obtain a front view axis of the head tube, an upper view axis of the rear wheel axle fixture, and a rear view axis of the rear wheel axle fixture; and finally, comparing the front view axis of the head tube, the upper view axis of the rear wheel axle fixture and the rear view axis of the rear wheel axle fixture respectively with three different preset reference lines, in order to determine whether an included angle between each two of the axes is within the acceptable range. Thereby, the measuring method of the present invention has the characteristics of fast operation and high accuracy.

Description

Bicycle frame measuring method

The invention relates to the measuring technology of the bicycle frame, in particular to a measuring method of the bicycle frame.

Whether it is a metal frame or a carbon fiber frame, both of them may cause offset deformation of the frame due to poor manufacturing process. Therefore, each frame factory will test some frames during the process of producing the frame. Measurement (such as offset). However, the current measurement methods are mainly operated by the measurement personnel in conjunction with calibration fixtures and measurement tools (such as height gauges), but the degree of expertise of each measurement personnel is different, plus the use of the aforementioned measurement tools. The position of the energy measurement is limited, so the manual measurement method is not too time-consuming, and the measurement result of the frame is likely to cause a large error.

The main object of the present invention is to provide a method for measuring a bicycle frame, which is convenient to operate and has good reliability and accuracy.

In order to achieve the above main object, the measuring method of the present invention comprises the following steps: a) fixing a bicycle frame to a working platform, and fixing a rear axle fixture to one of the bicycle frame and the lower fork. The working platform is provided with a front camera, an upper camera and a rear camera, the front camera is located in front of a head tube, the upper camera is located above the rear wheel axle fixture, and the rear camera is located behind the rear wheel axle fixture; Using the front camera, the upper camera and the rear camera respectively to capture the front view image of the head tube, the top view image of the rear axle fixture and the rear view image of the rear axle; c) analyzing the captured image Deriving the front tube axis, the rear axle and the rear axle and the rear axle; and d) comparing the front tube axis with a first predetermined reference line Deriving a first angle, and obtaining a second angle than the upper axis of the rear axle and a second predetermined reference line, and comparing the rear view axis with the third axis Preset baseline Out a third angle.

It can be seen from the above that the measurement method of the present invention uses the image recognition method to measure the relevant data (such as the offset amount) of the part to be tested of the bicycle frame (such as the head tube and the rear axle fixture), not only can Overcoming the existing problems of manual measurement, and the measurement process is faster and more convenient, and the reliability and accuracy can be effectively improved.

The detailed construction, features, assembly or use of the method of measuring the bicycle frame provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

The technical content and features of the present invention are described in detail below with reference to the preferred embodiments of the present invention, and the directionality of "before", "after", "upper", "down", etc. mentioned in the contents of the specification. The terminology used is merely an illustrative term based on the normal direction of use of the bicycle frame 10, and is not intended to limit the scope of the claim.

Please refer to FIG. 2 . The bicycle frame 10 shown in the figure includes a head tube 12 and a pair of rear forks 14 . Referring to FIG. 1 , the method for measuring the bicycle frame 10 of the present invention includes the following steps:

a) As shown in Fig. 3, the bicycle frame 10 is fixed to a work platform 20, and a rear axle fixture 30 is fixed to the lower fork 14 after the bicycle frame 10. In addition, the work platform 20 is provided with a front camera 40, an upper camera 42 and a rear camera 44. The front camera 40 is located in front of the head tube 12, the upper camera 42 is located above the rear axle fixture 30, and the rear camera 44 is located in the rear axle. With 30 after.

In the step S1, the bicycle frame 10 is fixed in various manners, for example, a plurality of support rods (not shown) are disposed on one of the back plates 21 of the work platform 20, and the bicycle frame 10 is supported by the support bars, because How to fix the bicycle frame 10 is not the focus of the present invention, and the applicant will not repeat any other fixed manners that may be taken. As for the rear axle fixture 30, which is mainly used to simulate a general rear axle, after the rear axle fixture 30 is mounted to the rear lower fork 14, the axis of the rear axle fixture 30 will be the same as the normal rear axle at each angle of view.

b) Using the front camera 40 to capture the head tube 12 forward view image 13, the upper camera 42 captures the rear axle fixture 30 top view image 31, and the rear camera 44 captures the rear axle fixture 30 rear view image 32.

In step S2, the types used by the front camera 40, the upper camera 42, and the rear camera 44 may be a Charge-coupled Device (CCD) or a Webcam. The qualified range of the object to be tested can be set in a human machine interface 50 before starting the shooting. After the shooting is completed, as shown in FIG. 4, the head tube 12 front view image 13, the rear wheel axle fixture 30 top view image 31, and the rear wheel axle fixer 30 rear view image 32 are immediately presented to the human machine interface 50.

c) As shown in Fig. 4, the captured image is analyzed to obtain the front tube axis A1, the rear axle fixture 30 upper viewing axis A2, and the rear axle fixture 30 rear viewing axis A3.

d) as shown in FIG. 4, comparing the front view axis A1 with a first predetermined reference line L1 to obtain a first angle α, and comparing the upper axis A2 and the rear axle of the rear axle fixture 30 The second preset reference line L2 is used to obtain a second angle β, and the rear axle 0.00 is rearwardly aligned with the third predetermined reference line L3 to obtain a third angle γ. If one of the three included angles is not within the qualified range set in step S2, it is judged to be defective.

Steps S3 to S4 are analysis and comparison of images on the human-machine interface 50. In step S4, the work platform 20 is provided with a lever 25 relative to the front camera 40 and a crossbar 26 with respect to the rear camera 44. The upright 25 is located in front of the side of the head tube 12, and the axis of the upright 25 is used as the first A predetermined reference line L1, the crossbar 26 is located on the front side of the rear axle fixture 30, and one end of the crossbar 26 is disposed on the backboard 21, and the axis of the crossbar 26 serves as a third predetermined reference line L3. In addition, the working platform 20 has a bottom plate 22 opposite to the upper camera 42. The bottom plate 22 has a plurality of elongated grooves 27 parallel to the axis of the rear wheel shaft, and the extending direction of any one of the elongated grooves 27 serves as a second pre-stage. Set the reference line L2.

However, in practice, the foregoing setting manners for the first, second, and third predetermined reference lines L1, L2, and L3 may be alternately used. For example, in FIG. 5, the work platform 20 has a rear side panel with respect to the front camera 40. 23 and a front side plate 24 opposite to the rear camera 44, the rear side plate 23 has three elongated grooves 28 perpendicular to the ground, and the extending direction of any one of the elongated grooves 28 serves as a first predetermined reference line L1, front The side plate 24 has two elongated grooves 29 parallel to the ground, and the extending direction of any one of the elongated grooves 29 serves as a third predetermined reference line L3. In addition, the crossbar 26 originally disposed in front of the rear axle fixture 30 may be modified to be disposed above or below the rear axle fixture 30, as long as it is located within the photographing range of the upper camera 42 together with the rear axle fixture 30, thereby The axis of the crossbar 26 at one position replaces the elongated slot 27 of the bottom plate 22 as the second predetermined reference line L2.

In summary, the measurement method of the present invention utilizes image recognition to measure the relevant data (such as the offset amount) of the object to be measured (such as the head tube 12 and the rear axle fixture 30), which can overcome the existing manual method. The problem of poor efficiency and large error caused by measurement makes the measurement process faster and more convenient, and can be effectively improved in terms of reliability and accuracy, thereby achieving the object of the present invention.

10‧‧‧Bicycle rack

12‧‧‧ head tube

13‧‧‧Front image

A1‧‧‧Foresight axis

14‧‧‧ After the fork

20‧‧‧Working platform

21‧‧‧ Backplane

22‧‧‧floor

23‧‧‧ rear side panel

24‧‧‧ front side panel

25‧‧‧ pole

26‧‧‧crossbar

27, 28, 29‧‧‧ long strips

30‧‧‧After axle fixture

31‧‧‧Upper image

32‧‧‧ Rear view image

A2‧‧‧Upper axis

A3‧‧‧ Rear view axis

40‧‧‧Front camera

42‧‧‧Upper camera

44‧‧‧After camera

50‧‧‧Human Machine Interface

L1‧‧‧ first preset baseline

L2‧‧‧ second preset baseline

L3‧‧‧ third preset baseline

Α‧‧‧first angle

Β‧‧‧second angle

Γ‧‧‧third angle

S1~S4‧‧‧ steps

Figure 1 is a flow chart of the measurement method of the present invention. Fig. 2 is a perspective view showing the appearance of a bicycle frame measured by the measuring method of the present invention. Fig. 3 is a perspective view showing the appearance of the bicycle frame fixed to the work platform by the measuring method of the present invention. Figure 4 is a schematic diagram of the measurement method of the present invention, mainly showing the comparison results presented in the human-machine interface. Figure 5 is similar to Figure 3 and mainly shows another setting of the first, second and third preset reference lines.

Claims (7)

A method for measuring a bicycle frame, the bicycle frame comprising a tube and a pair of lower forks, the measuring method comprising the following steps: a) fixing the bicycle frame to a working platform, and a rear axle fixture Fixed to the lower fork of the bicycle frame, the working platform is provided with a front camera, an upper camera and a rear camera, the front camera is located in front of the head tube, the upper camera is located above the rear axle fixture, the rear camera After the rear axle fixture is located; b) using the front camera, the upper camera, and the rear camera to respectively capture the front view image of the head tube, the top view image of the rear axle fixture, and the rear axle image of the rear axle; c) analyzing the captured image to obtain a front view axis of the head tube, an apparent axis of the rear axle fixture and a rear view axis of the rear axle fixture; and d) a front view of the head tube The axis and a first predetermined reference line are used to obtain a first angle, and a second angle is obtained from the upper axis of the rear axle and a second predetermined reference line, and a second angle is obtained. After the axle fixture The viewing axis and a third predetermined reference line are used to obtain a third angle. The method for measuring a bicycle frame according to claim 1, wherein the working platform is provided with a pole relative to the front camera, and the axis of the pole is the first predetermined reference line. The method for measuring a bicycle frame according to claim 1, wherein the working platform has a rear side panel opposite to the front camera, the rear side panel has an elongated slot, and the elongated slot extends in the first direction. Set the baseline. The method for measuring a bicycle frame according to claim 1, wherein the working platform has a bottom plate opposite to the upper camera, the bottom plate has an elongated slot, and the extending direction of the elongated slot serves as the second preset. Baseline. The method for measuring a bicycle frame according to claim 1, wherein the working platform has a backboard, and the backboard is provided with a crossbar relative to the rear camera, and the axis of the crossbar is the second predetermined reference line. The method for measuring a bicycle frame according to claim 1, wherein the working platform has a backboard, and the backboard is provided with a crossbar relative to the upper camera, and the axis of the crossbar is the third preset reference line. The method for measuring a bicycle frame according to claim 1, wherein the working platform has a front side panel opposite to the rear camera, the front side panel has an elongated slot, and the elongated slot extends in a third direction. Set the baseline.