JPH051356Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an apparatus for selecting defective products from cylindrical workpieces such as valve lifters.

"Prior Art" FIG. 7 shows a valve lifter 1 (also referred to as a tapet) used in a valve mechanism of an engine as an example of a cylindrical workpiece according to the present invention.

This valve lifter 1 has a flange portion 2A at the upper end.
It consists of a metal cylindrical main body 2 having in contact with
The rotational movement of the cam is converted into linear reciprocating movement of the valve lifter 1 to open and close the intake and exhaust valves.

By the way, when manufacturing the valve lifter 1 as described above, a method is adopted in which the main body 2 and the wear-resistant material 3 are molded separately, and then the wear-resistant material 3 is manually placed on the main body 2 and bonded with a wax. It is being However, at this time, in rare cases, the centers of the wear-resistant material 3 and the main body 2 may be misaligned, or the main body 2 or the wear-resistant material 3 may be deformed during the sintering process for adhesion, and strict precision is essential for these parts. Therefore, it is necessary to reliably eliminate these types of defective products.

Therefore, conventionally, the dimensions of the valve lifter 1 after molding, especially the fixing state of the wear-resistant material 3, are checked one by one manually using a special gauge to select defective products.

``The problem that the invention aims to solve'' However, the method of manually measuring each item as described above is naturally extremely inefficient and increases labor costs. Furthermore, since it relies on manual labor, it is difficult to say that the measurement accuracy is sufficient, and there is a risk that defective products may be overlooked. For this reason, there has been a strong need for a device that can automatically perform measurement and selection with high precision.

``Means for Solving the Problems'' The present invention was made to solve the above problems, and consists of a table that has a plurality of pockets on the periphery and is rotated intermittently, and a fixed position on the side of the table. A workpiece introducing mechanism is arranged to push the cylindrical workpieces one by one into the pocket, and a height measurement sensor presses the upper end of the workpiece at a predetermined rotational position of the table, and the lower end of the workpiece is pressed against the base surface. A height measuring mechanism that measures the height, and a drive roller that rotates the workpiece stored in the pocket around the axis of the workpiece at a predetermined rotational position of the table, and traces the outer circumferential surface of the rotating workpiece with a deflection probe to measure the workpiece. a runout measuring mechanism for measuring runout; and a workpiece lead-out mechanism that guides the workpiece that has been measured by the height measuring mechanism and the runout measuring mechanism to one of a plurality of workpiece lead-out paths according to the measurement results. shall be.

"Embodiments" Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in this embodiment, an example is given in which the above-mentioned valve lifter is used as a workpiece.

FIG. 1 and FIG. 2 are a plan view and a front view, respectively, of an automatic valve lifter sorting device according to one embodiment.

Reference numeral 10 in the figure is a horizontally installed pedestal,
An index 12 equipped with an index motor 11 is mounted on this pedestal 10 in the direction of arrow A.
A horizontal table 13 is provided which is rotated intermittently every 60°.

This table 13 consists of a base disk 14 and a guide disk 15 provided above and parallel to the base disk 14, and on the periphery of this guide disk 15 there are six U-shaped Notch (pocket)
16 are formed at equal intervals. Then, when the work 1 is stored in the pocket 16, the side of the work 1 is supported by the guide disk 15, and the work 1 is
The lower end of can be placed on the base disk 14 and transferred. Note that 17 is a guardrail that prevents the work 1 from falling from the pocket 16.

As shown in FIGS. 3 to 5, a pair of rubber fixed rollers 18 and 1 are provided on both upper and lower surfaces of the guide disc 15 near the pockets 16, respectively.
9 is attached horizontally rotatably, and these rollers 18, 18, 19, 19 come into contact with the side surface of the work 1 when the work 1 is stored in the pocket 16. Incidentally, among these fixed rollers 18, 18, 19, and 19, the upper and lower pairs form the same conical surface (A>B in FIG. 4) whose outer peripheral surfaces are slightly narrowed downward. There is.

Next, a work introduction mechanism 20 is provided at a position corresponding to one of the pockets 16 of the table 13 to push the work 1 into the pocket 16 one after another.

This work introduction mechanism 20 includes a conveyor 21 that carries a work 1 from a pre-process (not shown), a gate 22 for removing non-standard work that is shaped to sandwich the work 1 on the conveyor 21 from both sides, and a gate 22. It is equipped with a work pushing blade 23 that pushes the passed work 1 into the pocket 16. The work pushing blade 23 is reciprocated in the direction of arrow B in conjunction with the intermittent rotation of the table 13 by a blade cam 27 to which rotation of the index motor 11 is transmitted via gears 24, 25 and a timing belt 26. When this protrudes onto the conveyor 21, the works 1 closest to the table 13 are pushed into the empty pockets 16 one by one.

Next, a workpiece height measuring mechanism 28 is provided opposite the pocket 16 at a position rotated by 60° from the introduction mechanism 20. This height measuring mechanism 28
is connected to an electronic micrometer (not shown) and an actuator (not shown) as shown in FIG.
Each time the table 13 rotates 60 degrees, the measuring point 29 is brought into contact with the upper end surface of the workpiece 1 in the pocket 16, and the electric signal from the micrometer is transmitted to the computer. (not shown), the contact point 29 again
It is starting to increase.

Next, a workpiece deflection measuring mechanism 30 is provided at a position rotated by 60° from the height measuring mechanism 28 . This runout measuring mechanism 30 sandwiches the work 1 between the fixed rollers 18, 18, 19, 19 of the guide disk 15, and a drive roller 32 connected to the rotating shaft of a motor 31, and a wear-resistant material 3 on the upper end of the work 1. While the workpiece 1 is rotated around the axis by the driving roller 32, the circumferential surface of the wear-resistant material 3 is traced with the measuring stylus 33, and an electronic micrometer is used to trace the circumferential surface of the wear-resistant material 3. The amplitude of the probe 33 is converted into an electrical signal and transmitted to the computer. At that time, the rollers 18, 1 fixed to the guide disk 15
8, 19, 19 have a conical shape that narrows downward, so when the workpiece 1 is rotated while being sandwiched between these fixed rollers 18, 19 and the drive roller 32, the fixed rollers 18, 19 A force pushing down the workpiece 1 is generated at the contact surface between the workpiece 1 and the workpiece 1. Due to this action, the workpiece 1 does not rise from the base surface during rotation, and the runout measuring element 33 can accurately trace the outer circumferential surface of the thin wear-resistant material 3.

Next, at a position further rotated by 60° from the runout measuring mechanism 30, a defective product extraction mechanism 34 is provided. As shown in Fig. 6, this has a structure in which a claw 35 for withdrawing the workpiece is reciprocated by an actuator 36 controlled by a computer, and when a workpiece 1 judged to be defective by the computer is sent. , the claw 35 is moved to cause the item to fall from the pocket 16 onto the waste path 37.

In addition, at a position further rotated by 60 degrees,
A passing product deriving mechanism 38 is provided. This acceptable product deriving mechanism 38 is operated by a workpiece pushing claw 4 by a motor 39 that is operated in response to a signal from a computer.
0 is rotated, and the workpiece 1 determined to be an acceptable product is pushed onto a conveyor 40 (not shown) leading to the next process.

In the automatic workpiece sorting device as described above, the workpiece 1 sent by the conveyor 21 from the previous process is
Pocket 16 of table 13 by introducing mechanism 20
Then, the height of the workpiece 1 is measured by the height measuring mechanism 28 to check the adhesion state of the wear-resistant material 3 on the workpiece 1, and then the runout measuring mechanism 3
0 to confirm the concentricity of the wear-resistant material 3. Then, the workpieces 1 that are determined to be defective by the computer are sent to the scrap path 37 by the delivery mechanism 34, and the other acceptable products are placed on the conveyor 41 for the next process by the delivery mechanism 38. Therefore, according to this automatic sorting device, workpiece 1 can be manually sorted.
Compared to the conventional method of sorting, work efficiency can be significantly improved and labor costs can be reduced. Further, since uniform and accurate automatic measurement is possible, there is no risk of overlooking defective products, and it is possible to improve the reliability of the completed valve lifter 1.

It should be noted that the present invention is not limited to the above-described embodiments, and may have a configuration in which a mechanism for measuring other dimensions or weight of the workpiece 1 is added.

Furthermore, the workpiece is not limited to the above-mentioned valve lifter 1, but can also be applied to conical articles that similarly require high precision.

"Effects of the invention" As explained above, the automatic sorting device for cylindrical workpieces of the present invention can significantly improve work efficiency and reduce labor costs compared to the conventional method of manually sorting workpieces. can do. In addition, since uniform and accurate automatic measurement is possible, there is no risk of overlooking defective products, and it is possible to improve the reliability of the workpiece. In particular, when measuring runout at a flanged part that is thin in the axial direction of a cylindrical workpiece, the roller has a conical shape and presses the workpiece against one end in the axial direction for positioning. It has the advantage that it can be accurately traced without straying from the outer circumferential surface of the instrument, allowing accurate runout measurements.

[Brief explanation of the drawing]

Figures 1 to 6 show an automatic sorting device for valve lifters (cylindrical workpieces) according to an embodiment of the present invention. Figure 1 is a plan view, Figure 2 is a front view, and Figure 3 is an elevation view. FIG. 4 is a side view of the runout measuring mechanism, FIG. 5 is a cross-sectional view taken along the - line in FIG. 4, and FIG. 6 is a side view of the defective product extraction mechanism. Moreover, FIG. 7 is a front view of the valve lifter. 1... Work (valve lifter), 13... Table, 14... Base disk (having a base surface),
16... pocket, 18, 19... fixed roller,
20... Work introduction mechanism, 21... Conveyor, 2
8... Workpiece height measuring mechanism, 29... Height measuring element, 30... Workpiece runout measuring mechanism, 33... Runout measuring element, 34... Defective product lead-out mechanism, 37... Scrap article path (workpiece lead-out path) , 38... Acceptable product derivation mechanism,
41... Conveyor (work lead-out path).

Claims (1)

[Scope of utility model registration request] A table that has a plurality of pockets on its periphery and is rotated intermittently; a workpiece introduction mechanism that is placed at a fixed position on the side of the table and pushes cylindrical workpieces into the pockets one by one; A height measurement mechanism that measures the height of the workpiece by pressing the end surface with a height measurement sensor and pressing the lower end surface of the workpiece against the base surface, and a height measurement mechanism that measures the height of the workpiece by pressing the lower end surface of the workpiece against the base surface. A run-out measuring mechanism that measures the run-out of the workpiece by rotating it around the axis of the workpiece while being pinched by the rollers of the workpiece and tracing the outer peripheral surface of the rotating workpiece with a run-out measuring stylus, and measurement using the height measuring mechanism and the run-out measuring mechanism described above. and a workpiece ejection mechanism that guides the workpiece that has passed through the roller to one of a plurality of workpiece ejection paths according to the measurement result, and at least one of the rollers has a conical shape that narrows toward the base surface. Automatic sorting device for cylindrical workpieces.