JPH0321868Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a missing item detection device for a needle roller assembled to an outer race or the like.

(Prior art) Figures 6 and 7 show the parts to be detected that are missing by this device. Figure 7 shows the outer lace 3.
0, in which approximately 15 to 30 needle rollers 17 are assembled in two stages, upper and lower, with spacers 27 in between.

FIG. 8 shows a conventional device for detecting the missing part of the needle roller 17 of the component W shown in FIG. The conventional device generally consists of an assembly pallet 105 installed on the conveyance guide rail 2, and a detection unit 106 provided on one side of the conveyance guide rail 2 so as to be compatible with the assembly pallet 105. 10
Reference numeral 5 consists of a pallet body 109 which is movably fitted onto the conveyance guide rail 2, and an assembly jig 110 which is fixed onto the pallet body 109 and supports the above-mentioned part W'. Detection unit 106
has a detection dog 122 and a bracket 123
The detection bar 12 is supported so as to be slidable in the horizontal direction.
4, a detector 119 attached to the tip of the detection bar 124, a detection bar front and rear cylinder 126 fixed to the bracket 125 for moving the detection bar 124 forward and backward relative to the assembly pallet 105, and the upper end of the bracket 123. horizontal bracket 127
It is equipped with a position sensor 128 that detects the position of a detection dog 122 attached to the tip of the sensor.

In conventional equipment, part W' is assembled on pallet 1.
05 and sent to the detection station, where the front and rear cylinders 126
The detection bar 124 is advanced by
4 comes into contact with the needle roller 17 of the part W' and stops by reading the position sensor 128 of the detection dog 122, thereby detecting the missing part. In other words, in the case of a normal product, the first
The detection dog 122 stops at a predetermined position a as shown in FIG.
Since it stops at position b near the W' side, a dimensional difference x occurs in the stopping position. This is because the detector 119 enters between the needle rollers 17 and moves that much more.

(Problem to be solved by the invention) In this way, in the conventional device, when the detector 1 is out of stock,
In order to ensure that the rollers 19 push and spread the needle roller 17, the needle roller 17 is supported so that its upper surface is higher than the upper surface of the outer race 30, and the detector 1 is placed between the needle rollers 17.
19 is devised so that it can be inserted directly from the side.

However, due to variations in accuracy among the large number of assembled pallets 105, play between the assembled pallets 105 and the conveyance guide rail 2, play within the detection unit body 106, etc., the dimensions in the case of missing items shown in FIG. The difference x becomes smaller. As a result, it becomes difficult to reliably detect the missing part of the needle roller 17, and the defective parts are assembled in the next process, resulting in quality problems.

Furthermore, when detecting a component W in which the needle rollers 17 are arranged in two stages (Fig. 7) using a conventional device, it is possible to detect missing parts for the needle rollers 17 in the upper stage, but the needle rollers 17 in the lower stage can be detected as missing items.
Regarding No. 7, since the detector 119 cannot be inserted from the side, it is impossible to detect missing items. For this reason,
Detection of missing parts of the lower needle roller 17 requires a visual check by an operator, which is troublesome and requires a lot of effort and time.

The present invention has been developed in view of the above points, and is designed to increase the reliability of detecting missing parts of needle rollers by positioning the combined parts and inserting a detector inside them. It is.

(Means for Solving the Problems) Therefore, the means of the present invention is to combine an assembly pallet with an outer cylinder on which assembled parts including a plurality of needle rollers are mounted, and a needle roller that is slidably fitted into the outer cylinder. The assembly is formed by an inner cylinder on the outer periphery of which is set, and means for elastically biasing the inner cylinder toward one end of the inner cylinder with respect to the outer cylinder, and is moved relative to the assembly pallet in the advancing and retracting direction. A hollow cylindrical guide shaft having an outer diameter that matches the outer diameter of the inner cylinder is installed in the detection unit body so as to be located coaxially with the inner cylinder. The middle part of the detection lever with the detector is swingably connected to the detection unit body, and the detection unit body further includes a driving means for swinging the detection lever and a position for measuring the swinging position of the other end of the detection lever. The device is characterized by being equipped with a sensor.

The present invention is capable of detecting three locations in total with one device: a missing needle roller in the upper stage, a missing spacer in the middle, and a missing needle roller in the lower stage.

In the conventional device, the ability to detect missing parts of the needle roller was reduced due to the influence of accuracy errors in each part of the device, but with the device of the present invention, multiple parts can be detected directly through the guide shaft of the detection unit body using the combined parts. Since the needle roller is positioned and detected, the detection value is not affected by play in various parts of the device or variation in accuracy between individual assembled pallets, making it possible to improve detection accuracy. Furthermore, since the movement of the detector is minute, 0.5 to 1.0 mm, the detection lever is constructed in a swinging manner to increase the movement of the detector in order to improve the detection ability of the position sensor. The increasing magnification is determined by the position of the center of swing of the detection lever, but usually about 3 times is sufficient.

In order to be able to confirm the missing parts of the lower needle roller and the middle spacer using a detector, the relative position of the detection unit body to the assembly pallet can be adjusted, and the needle roller of the assembly pallet can be checked to prevent the needle roller from collapsing. The inner cylinder for prevention was made slidable in the axial direction of the roller. The detection unit body and the assembly pallet may be configured to be driven by means such as a cylinder so that one of them can move relative to the other in the axial direction of the inner cylinder.

In conventional detectors, the tip shape of the detector has a tip angle of α.
had a cylindrical shape with a cone of 60 to 90 degrees (see Fig. 11), but in the present invention, as shown in Fig. It has a stepped shape.

In addition, the outer cylinder has a stepped part for placing parts,
Further, the guide shaft shall be provided with a hole to enable the protruding movement of the detector.

(Operation) Next, the operation of detecting missing items by the device according to the present invention will be explained. First, the detection unit main body is moved relative to the assembly pallet on which the assembled parts are placed to a predetermined detection position corresponding to the upper needle roller. Then, by swinging the detection lever at that point, the detector is operated to enter between the needle rollers from inside the rollers, and the swing position of the other end of the detection lever at this time is measured by a position sensor. In this case, if the upper needle roller is missing, the detector will push the needle roller open and move that much more, and the amount of rocking displacement of the detection lever will be different from the value when it is a normal product, so it is reliable. It becomes possible to detect missing items.

Similarly, when detecting a missing part of the lower needle roller or a missing part of a spacer, move the detection unit body relative to the assembly pallet to a predetermined detection position corresponding to the lower needle roller and spacer, and then By performing the same detection operation as above, it is possible to reliably detect missing items.

As described above, in the present invention, the detection value of the detector is magnified as the amount of swinging displacement of the detection lever, so detection accuracy is increased, and the assembly quality can be checked reliably.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall view of the missing item detection device according to this embodiment. This device consists of a main body base 3 having a hole 1 and on which a conveyance guide rail 2 is laid, an assembly pallet 5 having an inner assembly jig 4 that is vertically slidable and provided on the conveyance guide rail 2. , conveyance guide rail 2
It is roughly composed of a detection unit 6 that is provided above so as to be compatible with the assembly pallet 5, and a detection unit upper and lower cylinder 8 that is fixed to the upper part of a bracket 7 that is installed upright on the main body base 3 and that moves the detection unit 6 up and down. has been done.

The assembly pallet 5 includes a pallet body 9 that is slidably fitted onto the conveyance guide rail 2, and a stepped plate that is fixed on the pallet body 9 and supports the part (double needle type) shown in FIG. 7. A cylindrical outer assembly jig 10, a cylindrical inner assembly jig 4 internally fitted to the outer assembly jig 10 so as to be vertically slidable, and a pin fixed to the outer assembly jig 10. 11, and a spring 12 that springs and biases the inner assembly jig 4 upward with respect to the outer assembly jig 10. It is said that it can be inserted into.

The detection unit 6 has a U-shaped bracket 13 connected at one end to the upper and lower detection unit cylinders 8.
A detection lever 15 of a detector unit 14 is attached to the intermediate portion of the horizontal portion of the bracket 13 so as to be swingable around a support pin 16. Further, a hollow guide shaft 18 is attached to a horizontal portion of the bracket 13, and is arranged outside the detection lever 15 and has an outer diameter that is the same as the inner diameter of the plurality of needle rollers 17 of the component W. A gap is provided between the narrow diameter portion of the guide shaft 18 and the detection lever 15 to allow the lever 15 to swing. A detector 19 formed to be insertable between the needle rollers 17 is fixed to the lower end of the detection lever 15 with a bolt 20. Note that a hole (see FIG. 2) 21 is provided on the side of the guide shaft 18 to allow the detector 19 to protrude outward.

A detection dog 22 is attached to the upper end of the detection lever 15, and the position of the detection dog 22 is determined by the position sensor 2 fixed to the other end of the U-shaped bracket 13.
It is now detected by 3. A detector unit front and rear cylinder 24 provided at one end of the bracket 13 is coupled to an intermediate portion of the detection lever 15 via a bracket 25 with a stop pin 26.

Next, the operation of this device will be explained.

First, the component W is mounted on the step surface of the outer assembly jig 10 in a state where it has been packaged on the inner assembly jig 4 of the assembly pallet 5 in the previous step, and is assembled and set. When the assembly pallet 5 is transported to the detection station corresponding to the detection unit 6, the detection unit 6 moves downward by the operation of the detection unit upper and lower cylinders 8, and the detector 19 moves from the standby position H to the detection position together with the guide shaft 18. Descend to I. Then, the inner assembly jig 4 is pushed down by the lower end of the guide shaft 18 and slidably displaced downward to a predetermined position against the spring 12.

Next, the front and rear cylinders 24 for the detection unit are moved forward, and the detection lever 15 is moved around the support pin 16 as a fulcrum.
By oscillatingly displacing the component W in the direction of the arrow A and measuring the position of the detection dog 22 after the displacement using the position sensor 23, it is determined whether the assembled state of the component W is normal or if it is missing.

FIG. 3 shows the case of a normal product, and FIG. 2 shows the case of a missing product in which one needle roller 17 in the upper stage is missing. Under normal conditions, the tip of the detector 19 (angle θ is approximately 90 degrees) hits the upper needle roller 17 and does not push the needle roller 17 open, so the detection dog 22 is at a predetermined position relative to the position sensor 23. Stop. On the other hand, when an item is out of stock, the tip of the detector 19 pushes open the upper needle roller 17 and enters between the rollers 17, causing an additional swing displacement of dimension c as shown in FIG. The dog 22 stops closer to the position sensor 23 than the predetermined position, and thereby it is possible to detect the shortage of the upper needle roller 17.

Next, after the detection judgment of the upper needle roller 17 is completed, the front and rear cylinders 2 for the detector unit are
4 to its original position, and the detection unit 6 is lowered by the operation of the detection unit upper and lower cylinders 8, thereby moving the detector 19 to the spacer 2.
It is lowered to the detection position J corresponding to 7. In this state, the same detection operation as that of the upper needle roller 17 described above is performed to detect the presence or absence of the spacer 27.

Furthermore, when the detection of the presence/absence of the spacer 27 is completed, the front and rear cylinders 24 for the detector unit are moved back to the original position, and the upper and lower cylinders 8 for the detection unit are operated to lower the detection unit 6. The detector 19 is lowered to a detection position K corresponding to the lower needle roller 17.

FIG. 4 shows the state when the detector 19 has descended to the detection position of the lower needle roller 17.
As shown in the figure, when the entire detection unit 6 is lowered by the detection unit upper and lower cylinders 8, the inner assembly jig 4 is downwardly displaced at the lower end of the guide shaft 18, and the lower end portion of the inner assembly jig 4 is moved downwardly. is inserted into the hole 1 of the main body base 3, and the guide shaft 18 having the same outer diameter as the outer diameter of the inner assembly jig 4 ensures the positioning of the upper and lower needle rollers 17 and the spacer 27. I'm going to Even in this positioning state, the same detection operation as that for the upper needle roller 17 described above is performed, and the missing item of the lower needle roller 17 is detected.

As described above, the same detection unit detects the upper needle roller 17, the spacer 27, and the lower needle roller 17 at three positions. When all the automatic detections at the above three locations are completed, the detection unit 6 is raised by the detection unit upper and lower cylinders 8, the detector 19 returns to the original standby position H, and one detection cycle of the double needle type component W is completed. . Thereafter, the normal parts will be assembled into other parts (not shown) in the next process, while the defective parts will be eliminated in the next process.

FIG. 5 shows another embodiment. In the previous embodiment, the detection unit 6 was lowered to the detection position with the assembly pallet 5 fixed, but in this embodiment, the detection was performed in the opposite manner. An assembly jig in which the detection unit 6 is fixed and the inner and outer assembly jigs 4, 10 and parts W, which are separably mounted on the pallet body 9 of the assembly pallet 5, are operated by the upper and lower cylinders 28 for lifters. It is configured to be raised to each detection position by a lifter 29 for detection.

(Effect of the invention) As described above, according to the invention, the detector is inserted between the needle rollers from that side, and the detection lever is swung to substantially expand the position of the detection dog. Because of this configuration, detection accuracy is improved compared to the conventional method, and the out-of-stock condition of the needle roller can be reliably detected. Furthermore, by using the device of the present invention, it is possible to reliably detect the missing part of the lower needle roller in a double needle type component, which could not be detected conventionally, and in addition, it is also possible to determine the presence or absence of a spacer in the middle.

[Brief explanation of the drawing]

FIG. 1 is an overall partially sectional view showing the structure of a missing item detection device according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of the detection unit showing the detection state in the case of missing items;
The figure is a cross-sectional view of the detection unit showing the detection state in the case of a normal product, Figure 4 is a partial cross-sectional view showing the state when the lower needle roller is detected by the device in Figure 1, and Figure 5 is the main body. A partial cross-sectional view showing the structure of a missing item detection device according to another embodiment of the invention, FIG. 6 is a cross-sectional view showing a type of component incorporating needle rollers in one stage, and FIG. 7 is a cross-sectional view showing a type of component incorporating needle rollers in two stages. 8 is a sectional view showing a conventional missing item detection device; FIG. 9 is a plan view of main parts showing a state in which the device shown in FIG. 8 detects missing items; 1st
FIG. 0 is a plan view of a main part showing a state in which a normal product is detected by the same device, and FIG. 11 is an explanatory diagram showing the tip shape of a conventional detector. 4...Inner assembly jig (inner cylinder), 5...Assembling pallet, 6...Detection unit, 8...Upper and lower cylinder for detection unit, 9...Pallet body, 10...
Outer assembly jig (outer cylinder), 12...Spring, 1
3...Bracket (detection unit body), 14...
...Detection unit, 15...Detection lever, 16...
Support pin, 17... Needle roller, 18...
Guide shaft, 19...detector, 22...detection dog, 23...position sensor, 24...front and rear cylinder for detector unit, 27...spacer, 2
9... Assembly jig lifter, W... Combination parts.

Claims (1)

[Scope of utility model registration request] The assembly pallet is assembled into an outer cylinder on which assembled parts including a plurality of needle rollers are placed, an inner cylinder which is slidably fitted into the outer cylinder and on which the needle rollers are set, and an inner cylinder with respect to the outer cylinder. A hollow cylindrical body having an outer diameter that matches the outer diameter of the inner cylinder is provided on the detection unit main body, which is formed by a means for biasing the cylinder toward one end thereof and is moved forward and backward relative to the assembly pallet. a guide shaft is provided coaxially with the inner cylinder, and an intermediate portion of a detection lever disposed inside the guide shaft and having a needle roller detector at one end is swingably coupled to the detection unit body; A missing item detection device for a needle roller, the detection unit body being provided with means for swinging the detection lever and a position sensor for measuring the swinging position of the other end of the detection lever.