JPH0526518Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] An outer ring having an inner diameter slightly larger than the maximum outer diameter of the retaining ring is arranged so as to be movable up and down in an area outside the outer circumference formed by the maximum outer diameter, and An inner ring in contact with the inner surface of the ring is disposed in a region inside the outer circumferential portion so as to be movable up and down, and a difference in each position level in the vertical movement direction of the outer ring and the inner ring is detected, and the level difference is determined in advance. A retaining ring attachment detection device that detects that the retaining ring is in a normal attachment state when the retaining ring matches the value,
It becomes possible to correctly determine whether the retaining ring is completely attached to the shaft or the like.

[Industrial application field]

The present invention relates to a retaining ring attachment detection device for detecting the attachment state of a retaining ring to a shaft or the like.

More specifically, the present invention refers to a retaining ring attachment detection device for detecting the attachment state of a retaining ring used to mutually fasten shafts of various mechanical components in audio equipment and the like.

[Conventional technology]

6 and 7 are diagrams for explaining the procedure for attaching the retaining ring, with FIG. 6 being a front view and FIG. 7 being a plan view. However, in FIG. 7, the state before and after the attachment of the retaining ring S and the shaft C is shown enlarged. Note that in this case, the E-shaped retaining ring S
As a representative example, the procedure for mounting the core on the shaft C by an automatic mounting machine will be described.

In FIG. 6, first, the retaining ring S is held by the holder 7 of the automatic mounting machine. Next, the fixing shaft 8 of the holder 7 is moved toward the axis C so that the holder 7 engages with the lower part of the alignment shaft 9. Further, as shown in FIG. 7, the three locking pieces of the retaining ring S are locked in the groove G of the shaft C, and the operation of attaching the retaining ring S to the shaft C is completed. In this case, it is necessary to detect whether the retaining ring S is properly installed in the groove G of the shaft C in order to prevent installation failure due to malfunction of the automatic installation machine or the like.

FIG. 8 is a front view showing an example of a conventional retaining ring attachment detection means. However, here, the pair of detection shafts 6 are shown in cross section.

In FIG. 8, the pair of detection shafts 6 are connected to the axis C.
After the mounting operation is completed, the detection shaft 6 is lowered toward the retaining ring S. Here, when the retaining ring S is attached to a predetermined position on the shaft C (a in FIG. 8), the detection shaft 6 is made to come into contact with the peripheral edge of the retaining ring S and stop. On the other hand, if the retaining ring S is not attached to the predetermined position on the shaft C (FIG. 8b), the detection shaft 6 should be made to stop at the reference position level, for example, at the lower position level of the groove G. . If there is a retaining ring S below the detection shaft 6, the position level of the detection shaft 6 will be higher than the reference position level by the thickness of the retaining ring S, so the attachment state of the retaining ring S is considered to be normal. .
On the other hand, when the position level of the detection axis S is equal to the reference position level, it is considered that the mounting is defective.

[The problem that the idea attempts to solve]

As mentioned above, conventionally, the presence or absence of the retaining ring S is detected by the detection shafts 6 etc. provided at two locations on the side surface of the shaft C to determine whether or not the retaining ring S is attached to the shaft C. Ta.

However, as shown in FIG. 9, if only some of the three locking pieces of the retaining ring S are locked in the groove G of the shaft C, the retaining ring S may be incomplete. Even though it is attached, the detection shaft 6 contacts the retaining ring S as shown in FIG. 10, so it is assumed that it is completely attached as in the case of FIG. 7. Therefore, the conventional detection means (FIG. 8) has the disadvantage that it is difficult to detect all installation defects, including incomplete installation of the retaining ring S, and to correctly determine whether the retaining ring S is installed properly or not. arise.

The present invention was developed in view of the above problems, and provides a retaining ring attachment detection device that can detect a retaining ring as defective even if the retaining ring is incompletely attached to a shaft, etc. The purpose is to provide

[Means to solve the problem]

FIG. 1 is a side view showing, in partial cross section, the principle structure of the present invention. Hereinafter, all side views and front views will be shown in partial cross-section. Regarding the components similar to those mentioned above,
They are indicated by the same reference numbers.

Here, an outer ring 1 having an inner diameter r slightly larger than the maximum outer diameter R of the retaining ring S is arranged in an area outside the outer circumferential portion defined by the maximum outer diameter R so as to be movable up and down. Furthermore, an inner ring 2 that is in contact with the inner surface of the outer ring is arranged in a region inside the outer circumference of the retaining ring S so as to be movable up and down. Furthermore, the difference in each position level in the vertical movement direction of the outer ring 1 and the inner ring 2 is detected, and when the level difference matches a predetermined value, it is detected that the retaining ring S is installed normally. The level difference detection means 3 is provided. The above-mentioned outer ring 1, inner ring 2, and level difference detection means 3 constitute the retaining ring attachment detection device of the present invention. In this case, a ring having a shape in which only a portion of the inner surface is hollow (for example, the inner ring 2) is also defined as a ring.

[Effect]

2A and 2B are diagrams for explaining the principle of the present invention; FIG. 2A is a front view thereof, and FIG. 2B is a sectional view taken along line BB in FIG. 2A.

Here, outer and inner rings 1 and 2 for checking the presence or absence of the retaining ring S are arranged vertically slidably on the outside and inside of the outer periphery formed by the maximum outer diameter R of the retaining ring S. . Further, if there is no retaining ring S, both the outer and inner rings 1 and 2 are set in advance to stop at a reference position level, for example, at a position level below the groove G on the axis C. In this way, when the retaining ring S is installed normally, that is, when it is installed in the normal position (see Figures 2A and 2B),
In Figure a), since only the inner ring 1 contacts the retaining ring S, the difference in position levels at the upper ends of both rings matches a predetermined value, for example, the thickness of the retaining ring S. On the other hand, if there is no retaining ring S at all (b in Figures 2A and 2B), both the outer and inner rings 1 and 2 descend to the reference level, so the difference in their respective position levels at their upper ends is The value is lower than the normal case by the thickness of the retaining ring S, for example, 0. Furthermore, if the retaining ring S is incompletely installed (c in Figs. 2A and 2B), both the outer and inner rings 1 and 2 contact the retaining ring S, so that their upper ends The difference between the respective position levels in etc. is 0 as before. That is, the outer ring 1 reliably detects even the slightest deviation of the retaining ring from its normal position. Finally, if the level difference between the two rings is detected by the level difference detection means 3, the mounting state of the retaining ring S can be easily detected.

Thus, in the present invention, all attachment defects including incomplete attachment of the retaining ring are detected without fail, so it is possible to correctly determine whether the retaining ring is completely attached.

〔Example〕

FIG. 3 is a side view showing the first embodiment of the present invention. Here, the level difference detection means 3 includes a first detection section 31 comprising a position level detector etc. that detects the position level of the upper end of the outer ring 1, and a position level detector 31 that detects the position level of the upper end of the inner ring 2. It consists of a second detection section 32 consisting of a detector etc., and an AND means 33 such as an AND circuit which takes the AND of the digital detection signals output from each of the first and second detection sections 31 and 32. be done. In this case, the absolute values of the position levels of the upper ends of the outer and inner rings 1 and 2 are detected separately. moreover,
In the first detection unit 31, when the absolute value of the position level of the upper end of the outer ring 1 matches the reference position level, for example, a value indicating the position level of the lower part of the groove G, there is no position deviation of the retaining ring S. Outputs an “H” (High) detection signal indicating that this is the case. On the other hand, in the second detection unit 32, when the absolute value of the position level of the upper end of the inner ring 2 matches a value higher than the reference position level by the thickness of the retaining ring S, the retaining ring S is attached. Outputs a detection signal of "H" indicating that the The AND means 33 determines that the retaining ring S is in a normal mounting state only when both detection signals become "H". In other words, the difference between the position levels of outer ring 1 and inner ring 2 is 2.
This means that detection is performed by a combination of two digital signals.

In the first embodiment, the outputs of the first and second detection sections 31 and 32 are combined with the AND means 33.
Since it can be monitored before inputting information, it is possible to determine whether the attachment is good or not, and also easily classify attachment failure modes such as falling retaining ring S or incomplete attachment (b and c in Figures 2A and 2B). It becomes possible to do so. Therefore, post-processing after detecting that the retaining ring S is incorrectly attached becomes easier.

FIG. 4 is a side view showing a specific example of the first embodiment of the present invention. Here, a first proximity sensor 41 and a second proximity sensor 42 are provided as the first detection section 31 and the second detection section 32 in FIG. 3, respectively. Further, an outer protrusion 11 and an inner protrusion 12 made of a conductor such as metal are formed on the side surfaces of the outer ring 1 and the inner ring 2, respectively.

When the retaining ring S is installed in the correct position, the outer and inner protrusions 11 and 12 are close to the first and second proximity sensors 41 and 42, respectively, so that the inside of these proximity sensors 41 and 42 is The capacitance between the electrodes and the electrodes placed on the electrodes changes. By detecting these changes and outputting them as digital detection signals, it is possible to correctly detect that the retaining ring S is completely attached.

In the specific example of the first embodiment, proximity sensors are used as the first and second detection sections 31 and 32, but photoelectric switches, micro switches, etc. can also be used instead.

FIG. 5 is a side view showing a second embodiment of the present invention. In this case, as the level difference detection means 3, a micro switch 43 is provided between the outer protrusion 11 and the inner protrusion 12. Here, when the retaining ring S is attached to the correct position on the shaft C, the distance between the outer protrusion 11 and the inner protrusion 12 is set in advance so that the micro switch 43 is turned off. put. Furthermore, if there is no retaining ring S at all or if it is installed incompletely, both protrusions 1
Since the distance between 1 and 12 is reduced by the thickness of the retaining ring S compared to the normal distance, it is set so that the micro switch 43 is turned on by this thickness reduction. In this way, it is possible to correctly determine whether or not the attachment is correct by turning one microswitch 43 off or on. Therefore, the second embodiment (FIG. 5) requires fewer components than the first embodiment (FIG. 3).

[Effect of idea]

As explained above, according to the present invention, even when the retaining ring is incompletely installed on the shaft, etc.,
Since the attachment defect is detected without exception, a retaining ring attachment detection device is realized that can correctly determine whether or not the retaining ring is completely attached. Therefore, it is possible to reliably prevent an incompletely attached retaining ring from being mixed into products or the like.

[Brief explanation of drawings]

Fig. 1 is a side view showing the principle structure of the present invention in partial cross section, Fig. 2A is a front view for explaining the principle of the invention, Fig. 2B is a sectional view taken along line B-B of Fig. 2A, and Fig. 3 4 is a side view showing a specific example of the first embodiment of the invention, FIG. 5 is a side view showing a second embodiment of the invention, and FIG. The figure is a front view to explain the retaining ring installation procedure.
8 is a front view showing an example of a conventional retaining ring attachment detection means; FIG. 9 is a plan view showing a state in which the retaining ring is incompletely attached; FIG. FIG. 10 is a plan view for explaining the conventional problems. In the figure, 1... outer ring, 2... inner ring, 3... level difference detection means, 31... first detection section, 32... second detection section, 41... first proximity sensor, 42... Second proximity sensor, 43...micro switch.

Claims (1)

[Claims for Utility Model Registration] A retaining ring detection device for detecting the attachment state of a retaining ring S, which has an inner diameter r that is slightly larger than the maximum outer diameter R of the retaining ring S, and has an inner diameter r that is slightly larger than the maximum outer diameter R of the retaining ring S. An outer ring 1 that is vertically movably arranged in an area outside the outer circumferential portion formed by R; and an inner ring that is in contact with the inner surface of the outer ring 1 and that is arranged vertically movably in an inner area of the outer circumferential portion. 2, detecting a difference in each position level of the outer ring 1 and the inner ring 2 in the vertical movement direction, and when the level difference matches a predetermined value, it is determined that the mounting state is normal; A retaining ring attachment detection device comprising a level difference detection means 3 for detecting a level difference.