JP2017140674A - O-ring assembling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an O-ring assembling machine which is provided with a simple configuration and can assemble an O-ring simply and reliably.SOLUTION: An O-ring assembling machine includes: a guide 2 to be inserted to a hole part 51; a shaft body 4 to be inserted/extracted to/from the guide 2; and a plurality of claw members 6 to be restrained onto an outer circumferential surface 5 of the shaft body 4. Therein, a tapered surface 3b is provided on a circumferential surface 3a, thereby, the guide 2 has a small-diameter opening end 7 and a large-diameter opening end 8 respectively on one end 2a and the other end 2b, and the plurality of claw members 6 include a pair of entraining claws 10 and 10 which entrain an O-ring 100 to each restrain part 10a before the shaft body 4 is inserted to an inner part 3 and a pair of pressing claws 11 and 11 which press the O-ring 100 restrained by the pair of restraining claws 10 and 10 when the shaft body 4 is inserted to the inner part 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an O-ring assembly machine that assembles an O-ring into an annular groove formed in a hole, and in particular, a guide inserted into the hole, a shaft body inserted into and removed from the guide, and a shaft body. And a plurality of claw members to be locked.

Conventionally, when an O-ring is assembled to an annular groove formed on the inner peripheral surface of a cylindrical tube, the O-ring is gradually fitted into the annular groove by using a long and thin bar-shaped assembly jig or the like exclusively by hand. The method was taken.
However, in such a case, it is difficult to assemble the O-ring into the annular groove because it is difficult to securely hold the O-ring having elasticity and a small diameter with an assembling jig or the like. There was a problem that working efficiency was not good.
Therefore, in recent years, a technique for automatically assembling an O-ring into an annular groove has been developed, and several inventions have already been disclosed.

Patent Document 1 discloses an invention relating to a method of automatically mounting using the O-ring flexure correction and restoring property under the name of “automatic insertion and mounting method of hole O-ring”.
Hereinafter, the invention disclosed in Patent Document 1 will be described. The invention disclosed in Patent Document 1 utilizes the flexibility of the O-ring to intentionally deform and insert the O-ring with a gripping mechanism, and remove the O-ring in the vicinity of a predetermined position to enter a predetermined O-ring groove. An O-ring is attached.
According to the automatic insertion and mounting method of the O-ring for holes having such characteristics, the troublesomeness and reduction in efficiency of manual O-ring mounting as in the past can be solved and labor saving can be achieved.

Next, Patent Document 2 discloses an invention relating to an assembling apparatus for fitting an elastic ring into an inner circumferential annular groove formed in a hole of a work under the name “an elastic ring assembling apparatus”.
Hereinafter, the invention disclosed in Patent Document 2 will be described. The invention disclosed in Patent Document 2 is composed of a taper guide that is penetrated and fixed to the lower support and has a taper hole, and an apparatus main body that is mounted on the upper support, and can hold and hold the elastic ring. A hollow shaft-shaped holder provided with a bowl-shaped ring holding portion, a plurality of pressing claws with a lower end opposed to the ring holding portion at a predetermined interval, and a lower end portion of the pressing claw and a holder ring at the lower end Consists of a push-in shaft that forms an L-shaped push-in part that can protrude and retract radially outward from the holding part, a rocking mechanism that rocks the push-shaft, and a rotation mechanism that rotates the holder in the direction around the axis Then, the elastic ring latched and held by the ring holding portion of the holder can be pressed downward with a pressing claw that rotates in a closing direction against a biasing force by sliding contact with the tapered hole. In addition, the push-in part of the push-in shaft must be able to push it outward in the radial direction. And butterflies. According to the assembling apparatus of the elastic ring having such a feature, it is possible to securely fit the elastic ring made of rubber or synthetic resin having a weak elastic restoring force into the inner circumferential annular groove formed in the hole of the workpiece. . In addition, the structure is simple, the manufacturing is easy, and the manufacturing cost is low.

Furthermore, Patent Document 3 discloses an invention relating to an assembly device for assembling an O-ring in an annular groove formed on the inner peripheral surface of an O-ring mounting hole under the name “O-ring assembly device”.
Hereinafter, the invention disclosed in Patent Document 3 will be described. The invention disclosed in Patent Document 3 is an apparatus for assembling an O-ring in an annular groove formed in an inner peripheral surface of an O-ring mounting hole, and holds the holding means and the holding means for holding the O-ring. Moving means for inserting / removing the O-ring with respect to the O-ring mounting hole in a state where the O-ring is coaxially arranged with respect to the O-ring mounting hole, and the O-ring held by the holding member from the inner diameter of the O-ring mounting hole during insertion movement While the O-ring is reduced in diameter, the O-ring is provided with O-ring deformation means for releasing the deformation of the O-ring and elastically restoring the original diameter at the insertion end position facing the annular groove. According to the O-ring assembling apparatus having such a feature, it is possible to mechanize the O-ring assembling, and the working time can be greatly reduced as compared with the manual work performed by inserting a finger into the O-ring mounting hole. It can be easily assembled into an annular groove deep inside the O-ring mounting hole, and there is no risk of injury to the fingertips. Safe and efficient assembly of the O-ring It can be performed.

JP 47-40566 A Japanese Patent Laid-Open No. 5-318238 Japanese Patent Laid-Open No. 11-33842

However, in the invention disclosed in Patent Document 1, since an opening / closing mechanism such as a compression spring or a control pin is required to operate the grip lever, the configuration is slightly complicated. In addition, it is necessary to adjust the degree of opening and closing of the grip lever so that the O-ring having a small diameter is securely gripped and the O-ring is easily detached when the ironing bar pushes the O-ring. That is, it may not be easy to adjust the grip lever having such a restriction.
Furthermore, as disclosed in FIG. 4 of the same document, when the grip lever grips the O-ring, the inner surface of the grip lever is formed smoothly, so that the O-ring is on the back side (direction b) of the grip lever. There is a risk of moving. In this case, as disclosed in FIG. 5, even if the ironing bar is advanced in the direction c, the O-ring bends in the reverse direction of FIG. There is a possibility that it is difficult to be attached to.

  Next, in the invention disclosed in Patent Document 2, in order to push the elastic ring into the inner peripheral annular groove of the workpiece, the pushing shaft is rotated around the pivot, and then the holder is rotated in a predetermined direction. Is called. In order to realize such an operation, as disclosed in FIG. 1 of the same document, a somewhat complicated structure is required. Therefore, there is a possibility that the manufacturing cost cannot be suppressed at a low cost.

  Furthermore, in the invention disclosed in Patent Document 3, as disclosed in FIGS. 3 and 4 of the same document, it is difficult to bend only a part of the small-diameter O-ring into a U-shape. If it is not a large diameter O-ring, it may be difficult to assemble. Similarly to the invention disclosed in Patent Document 2, since the holding member is driven to rotate about its axis in order to completely install the O-ring in the annular groove, the assembly operation may be complicated. There is.

  The present invention has been made in response to such a conventional situation, and can be easily and reliably assembled to the annular groove while being inexpensively manufactured by providing a simple configuration. An object is to provide an O-ring assembly machine.

  In order to achieve the above object, a first invention is an O-ring assembly machine that assembles an O-ring into an annular groove formed in a hole of a workpiece, and the hole is formed so that one end thereof does not close the annular groove. A cylindrical guide inserted into the shaft, a shaft body inserted into and extracted from the inside of the guide, and a plurality of claw members locked to the outer peripheral surface of the shaft body. By providing a tapered surface with a diameter decreasing toward the one end direction from the other end on at least a part of the surface, a small-diameter opening end and a large-diameter opening end are formed at one end and the other end, respectively. The claw member includes a plurality of locking claws for locking the O-rings to the respective locking portions before the shaft body is inserted into the shaft body, and a plurality of engagement members when the shaft body is inserted into the shaft body. A plurality of pressing claws that press the O-rings locked to the pawls, and the plurality of pressings Is via the pressing pawl slide portion provided on the outer circumferential surface along the longitudinal direction of the shaft, characterized in that it is configured to slidably.

In the invention having such a configuration, the guide is disposed above the workpiece, and the shaft body on which the plurality of claw members are locked is disposed above the guide. The O-ring is held by the shaft body via a plurality of locking claws.
Further, the guide, the shaft body, and the plurality of pressing claws are configured to be vertically movable independently by being connected to, for example, an air cylinder.
Further, “the guide is on at least a part of the circumferential surface constituting the inside” means that the tapered surface is a part of the circumferential surface near one end, a part near the other end, or the other It means that it may be formed from the end to the entire end.

Then, by inserting one end of the guide into the hole so as not to close the annular groove, the small-diameter opening end is disposed immediately above the annular groove.
Further, the plurality of pressing claws are configured to be slidable along the longitudinal direction of the shaft body,
The plurality of locking claws may or may not be configured to be slidable. In the former, for example, the plurality of locking claws are configured to be movable up and down independently of the shaft body by being connected to an air cylinder. In the latter, the plurality of locking claws are configured to be movable up and down integrally with the shaft body.

In the invention with the above configuration, first, a guide is inserted into the hole from above the workpiece. Next, the O-ring is locked to the locking portions of the plurality of locking claws, and the shaft body is lowered toward one end of the guide. At this time, the plurality of pressing claws are arranged above the O-ring so as not to come into contact therewith.
As the shaft body descends, the O-ring slides on the tapered surface of the guide, and the O-ring is deformed into a substantially U-shaped or irregular curved shape, depending on the number and arrangement of the plurality of locking claws. . More specifically, the lowermost portion of the deformed O-ring in a side view is a portion that is locked by a plurality of locking claws. When the lowermost part reaches the same height as the annular groove, the lowering of the shaft body is stopped, and then the plurality of pressing claws are lowered to press the uppermost part of the deformed O-ring. As a result, the deformed O-ring is restored to its original shape, and is thus fitted into the annular groove.
Thereafter, the shaft body and the plurality of locking claws are raised and extracted from the inside of the guide, and the O-ring assembly machine returns to a state in which a new O-ring can be locked to the locking portion. The guide may be inserted into the hole of the workpiece or may be extracted.

Next, in a second aspect based on the first aspect, the plurality of locking claws are a pair of locking claws symmetrically disposed on the outer peripheral surface about the central axis of the shaft body, and the plurality of pressing claws The claws are a pair of pressing claws arranged on the outer peripheral surface so as to be rotated 90 degrees about the center axis with respect to the pair of locking claws, symmetrically about the center axis. .
In the invention having such a configuration, in addition to the action of the first invention, the O-ring is locked every 180 degrees around the central axis of the shaft body by the pair of locking claws. Therefore, when the O-ring slides on the tapered surface, the O-ring itself is not twisted or inclined, and the pair of lowermost portions in the side view maintains a uniform height with respect to the annular groove. However, each reaches the same height as the annular groove. In this case, the O-ring is deformed into a substantially U shape in a side view.
Next, the pair of pressing claws are arranged so that the O-ring rotates every 180 degrees around the central axis of the shaft body and 90 degrees around the central axis with respect to the pair of locking claws. Thus, the pair of pressing claws uniformly press the pair of uppermost portions in the side view of the O-ring. Accordingly, the pair of uppermost portions in the side view reaches the same height as the annular groove while maintaining a uniform height with respect to the annular groove.

Subsequently, according to a third invention, in the first or second invention, the hole is formed with a bottom surface in contact with the annular groove, and the shaft body restricts insertion of the shaft body into the tip at the tip. And a stopper member capable of contacting the bottom surface of the hole, and the plurality of locking claws are each provided with a contact end that contacts the stopper member when the shaft body is inserted into the locking member. The portion is provided in the vicinity of the abutting end so as to be the same height as the annular groove when the tip abuts against the stopper member.
In the invention having such a configuration, for example, a disc-shaped member having a diameter that can pass through a small-diameter opening end is conceivable as the stopper member, and the locking portion is provided, for example, on the outer surface of a plurality of locking claws. Concavities to be formed are conceivable.
In the invention of the above configuration, in addition to the operation of the first or second invention, when the shaft body is inserted into the guide multiple times, the tip of the shaft body has a constant height substantially the same as the height of the annular groove. To be unified.
Further, by providing the pair of latching claws with the latching portions, it is possible to prevent the O-ring from rising along the pair of latching claws when the O-ring slides on the tapered surface. Further, since this locking portion is provided in the vicinity of the contact end so as to be the same height as the annular groove when the tip end of the shaft body contacts the stopper member, the O-ring is pressed by the plurality of pressing claws. Then, the O-ring to be restored is immediately removed from the locking portion and fitted into the annular groove.

Further, in a fourth aspect of the invention according to any one of the first to third aspects, the small-diameter opening end opens so that the shaft body and a plurality of claw members locked to the shaft body can pass therethrough, In addition, at least one of the outer peripheral surface of the shaft body and the outer surfaces of the plurality of claw members can pass while sliding.
In the invention having such a configuration, in addition to the operation of the invention according to any one of the first to third aspects, the shaft body and the plurality of claw members locked to the shaft body pass through the small-diameter opening end. Thus, the O-ring can be fitted into the annular groove disposed below the small-diameter opening end.
Further, at least one of the outer peripheral surface of the shaft body and the outer surfaces of the plurality of claw members slides on the inner peripheral surface of the small diameter opening end, so that the vicinity of the tip end of the shaft body is guided by the small diameter opening end. Therefore, the wobbling when the shaft body and the plurality of claw members descend is prevented.

Next, a fifth invention is characterized in that, in the invention according to any one of the first to fourth inventions, the diameter of the large-diameter opening end is equal to or larger than the outer diameter of the O-ring.
In the invention having such a configuration, in addition to the action of the invention described in any one of the first to fourth aspects, the diameter of the large-diameter opening end is equal to or larger than the outer diameter of the O-ring, so When the O-ring is introduced into the guide, the O-ring is easily introduced into the guide and is not subjected to unnecessary deformation.

A sixth invention is the invention according to any one of the first to fifth aspects, wherein the plurality of locking claws are arranged along a longitudinal direction of the shaft body via a locking claw slide portion provided on the outer peripheral surface. It is configured to be slidable.
In the invention having such a configuration, in addition to the action of the invention according to any one of the first to fifth aspects, the vertical movement of the plurality of locking claws is performed independently of the vertical movement of the shaft body. The speed and range of movement of the plurality of locking claws are set independently.

According to the first invention, the guide is inserted into the hole portion of the workpiece, the O-ring is locked to the locking portions of the plurality of locking claws, and then the shaft body is lowered toward one end of the guide. By simply moving the pressing claw down, the O-ring can be reliably assembled to the annular groove.
Further, according to the first invention, it is composed of a guide, a shaft body, and a plurality of claw members, and has a simple configuration as compared with the prior art disclosed in Patent Documents 1 to 3, Inexpensive production and introduction is possible.

  According to the second invention, in addition to the effects of the first invention, the pair of lowermost and uppermost parts are formed on the O-ring at different timings by the pair of locking claws and the pressing claws, respectively. The O-ring can be freely deformed into a shape that can be easily lowered in the guide and can be easily fitted into the annular groove. And finally, since each of the pair of lowermost and uppermost parts reaches the same height as the annular groove, the O-ring can be completely restored to the original annular shape. Therefore, the O-ring can be reliably assembled to the annular groove.

  According to the third invention, in addition to the effects of the first or second invention, the operation time can be minimized.

  According to the fourth invention, in addition to the effects of any one of the first to third inventions, the shaft ring and the like are prevented from wobbling when descending, so the O-ring slides on the tapered surface of the guide. When moving, for example, it is possible to prevent asymmetric deformation with respect to the central axis of the shaft body. Therefore, the O-ring can be assembled to the annular groove with high accuracy.

  According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, the O-ring is easily introduced into the guide, so that the O-ring is reliably lowered along the tapered surface. Can do.

  According to the sixth aspect of the invention, in addition to the effects of any one of the first to fifth aspects, a combination of the vertical movement speed of the shaft body and the vertical movement speed of the plurality of locking claws, Even O-rings of different sizes can be handled finely, improving versatility.

It is a disassembled side view of the O-ring assembly machine which concerns on an Example. (A) And (b) is a side view of the guide and shaft which comprise the O-ring assembly machine based on an Example, respectively. (A) And (b) is the side view of the some latching nail which comprises the O-ring assembly machine which concerns on an Example, respectively, and the B direction arrow view of (a), (c) and (d) These are a side view of a plurality of pressing claws, respectively, and a C direction arrow view of (c). (A) And (b) is a side view of a shaft and a plurality of claw members which constitute an O ring assembly machine concerning an example, respectively, (c) is a DD line arrow section in (a). FIG. (A) And (b) is a side view explaining operation | movement of the O-ring assembly machine based on an Example, respectively. (A) And (b) is a side view explaining operation | movement of the O-ring assembly machine based on an Example, respectively. (A) And (b) is a longitudinal cross-sectional view explaining the deformation | transformation of an O-ring corresponding to the case where the O-ring assembly machine based on an Example is each operated. (A) And (b) is a longitudinal cross-sectional view explaining the deformation | transformation of an O-ring corresponding to the case where the O-ring assembly machine based on an Example is each operated.

An O-ring assembly machine according to an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is an exploded side view of an O-ring assembly machine according to an embodiment.
As shown in FIG. 1, the O-ring assembly machine 1 according to the embodiment assembles an elastic O-ring 100 (see FIGS. 5 to 8) in an annular groove 52 formed in a hole 51 of a workpiece 50. a O-ring assembly machine, a cylindrical guide 2 having one end 2a is inserted into the hole portion 51 so as not to close the annular groove 52 is insertion into the interior 3 of the guide 2 (figure V ₁ comprises a V ₂ direction) shaft 4, a plurality of pawl members 6 to be engaged with the outer peripheral surface 5 of the shaft body 4, a. Incidentally, the work 50 is fixed to the pedestal 54, the hole 51 has a bottom surface 53 is formed below the annular groove 52 (figure V ₁ direction). Further, the annular groove 52 is formed so that the bottom 52a is horizontal in a side view when the work 50 is fixed to the pedestal 54.

Next, the guide and shaft body constituting the O-ring assembly machine according to the present embodiment will be described in more detail with reference to FIG. FIG. 2A and FIG. 2B are side views of a guide and a shaft body constituting the O-ring assembly machine according to the embodiment, respectively. In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted.
As shown in FIG. 2 (a), the guide 2 is provided with a tapered surface 3b whose diameter is reduced from the other end 2b toward the one end 2a in a part of the circumferential surface 3a constituting the inside 3. Thus, a small-diameter opening end 7 and a large-diameter opening end 8 are formed at the one end 2a and the other end 2b, respectively.
More specifically, the diameter of the large-diameter open end 8 is equal to the outer diameter of the O-ring 100. The small-diameter opening end 7 is open so that the shaft body 4 and a plurality of claw members 6 locked to the shaft body 4 can pass therethrough, and the outer peripheral surface 5 of the shaft body 4 can pass while sliding. It is. On the other hand, the small-diameter open end 7 has a diameter smaller than the outer diameter of the O-ring 100.

  Further, as shown in FIG. 2B, the shaft body 4 has a tip 4 a forming a tapered portion 4 b and a latching claw slide portion for latching a plurality of claw members 6 to the outer peripheral surface 5. 12 and a pressing claw slide portion 13 are provided. Further, the shaft body 4 is provided with a stopper member 9 capable of coming into contact with the bottom surface 53 (see FIG. 1) in order to limit the insertion of the shaft body 4 into the inside 3 at the tip 4a. Specifically, the stopper member 9 is a disk-shaped member having a diameter d that can pass through the small-diameter open end 7.

Further, a plurality of locking claws constituting the O-ring assembling machine according to the present embodiment will be described in more detail with reference to FIGS. 3 (a) and 3 (b) are a side view of a plurality of locking claws constituting the O-ring assembly machine according to the embodiment and a view in the direction of arrow B in FIG. 3 (a), respectively. 3 (c) and FIG. 3 (d) are a side view of a plurality of pressing claws and a view in the direction of arrow C in FIG. 3 (c), respectively. 1 and 2 are denoted by the same reference numerals in FIG. 3 and description thereof is omitted.
First, returning to FIG. 2 (b) again, before the shaft body 4 is inserted into the interior 3 (see FIG. 5 (a)), the plurality of claw members 6 have their O-rings 100 connected to the respective locking portions 10a. When the shaft body 4 is inserted into the interior 3 (see FIG. 6A), the O-ring 100 locked to the plurality of locking claws 10 (see FIG. 6). 5 to FIG. 8), and a plurality of pressing claws 11.

Next, as shown in FIGS. 3 (a) and 3 (b), each of the plurality of locking claws 10 has a long shape, and has a recessed locking portion 10a at one end thereof, the other end and an intermediate portion. And a fixing portion 10b for fixing the locking claw 10 to an air cylinder (not shown) that moves the locking claw 10 up and down. Among these, as shown in FIG. 3 (b), the upper edge u of the locking portion 10a has a gently curved shape convex downward, as shown in FIGS. 7 (b) and 8 (a). In addition, the O-ring 100 is configured to be easily bent.
Each of the plurality of locking claws 10 is provided with a contact end 10 c that contacts the stopper member 9 when the shaft body 4 is inserted into the interior 3.
The locking portion 10a is provided in the vicinity of the contact end 10c so as to be substantially the same height as the annular groove 52 when the tip 4a (see FIG. 2B) contacts the stopper member 9.

  Subsequently, as shown in FIG. 3 (c), each of the plurality of pressing claws 11 is substantially L-shaped and has a pressing portion 11a that presses the O-ring 100 at one end thereof and a pressing portion at the other end and an intermediate portion. And a fixing portion 11b for fixing the claw 11 to the support body 55 (see FIGS. 5 and 6). Among these, as shown in FIG. 3D, the pressing portion 11 a is provided with a groove portion S, and is configured to easily increase the pressure when pressing the O-ring 100.

Further, the shaft body and the plurality of claw members constituting the O-ring assembly machine according to the present embodiment will be described in more detail with reference to FIG. 4 (a) and 4 (b) are side views of a shaft body and a plurality of claw members constituting the O-ring assembly machine according to the embodiment, respectively, and FIG. 4 (c) is a side view of FIG. 4 (a). It is a DD sectional view taken on the line. The constituent elements shown in FIGS. 1 to 3 are denoted by the same reference numerals in FIG. 4 and the description thereof is omitted.
As shown in FIGS. 4 (a) and 4 (b), the plurality of locking claws 10 and the plurality of pressing claws 11 are each formed in a rail shape, and the locking claw slide portion 12 and the pressing claw provided on the outer peripheral surface 5, respectively. It is configured to be slidable along the longitudinal direction Y of the shaft body 4 via the slide portion 13.

Further, as shown in FIG. 4C, the plurality of locking claws 10 are a pair of locking claws 10 and 10 that are symmetrically disposed on the outer peripheral surface 5 around the central axis E of the shaft body 4. .
Further, the plurality of pressing claws 11 are arranged on the outer peripheral surface 5 so as to be symmetrical about the central axis E and rotated 90 degrees about the central axis E with respect to the pair of locking claws 10 and 10. A pair of pressing claws 11, 11.

Furthermore, the operation of the O-ring assembly machine according to the present embodiment will be described in more detail with reference to FIGS. FIG. 5A, FIG. 5B, FIG. 6A, and FIG. 6B are side views for explaining the operation of the O-ring assembly machine according to the embodiment. The components shown in FIGS. 1 to 4 are denoted by the same reference numerals in FIGS. 5 and 6 and the description thereof is omitted.
First, FIG. 5A shows an initial state before the shaft body 4 is inserted into the interior 3.
As shown in FIG. 5A, first, the guide 2 is inserted into the hole 51 of the workpiece 50 arranged on the same axis as the central axis E. The shaft body 4, the pair of locking claws 10, 10 and the pair of pressing claws 11, 11 are arranged immediately above the workpiece 50 and the guide 2. Among these, the pair of locking claws 10, 10 that are moved up and down by an air cylinder (not shown) stopped at the locking portions 10 a, 10 a slightly below the tapered portion 4 b of the shaft body 4 (side toward V ₁ ). It is in a state. Therefore, the O-ring 100 is locked to the locking portions 10a and 10a. The pair of pressing claws 11 and 11 are supported by support bodies 55 and 55, respectively. The support body 55 is connected to an air cylinder (not shown) for moving the support claws up and down.
Note that the reason why the shaft body 4 is provided with the tapered portion 4b is that the locking portion 10a is concave. That is, if the taper 4b is not provided, even if the locking portion 10a is lowered and escaped from the locking claw slide portion 12, the locking portion 10a can lock the O-ring 100. This is because it cannot be done.
Next, FIG. 5B shows a state in which the shaft body 4 and the pair of locking claws 10, 10 have started to be inserted into the interior 3.
As shown in FIG. 5 (b), after the shaft body 4 is lowered until the stopper member 9 comes into contact with the bottom surface 53 of the hole 51, only the pair of locking claws 10 and 10 are still lowered independently. .

Next, FIG. 6A shows a state in which the stopper member 9 of the shaft body 4 is in contact with the bottom surface 53 of the hole 51 and the contact end 10 c is in contact with the stopper member 9.
As shown in FIG. 6 (a), after the shaft body 4 and the pair of locking claws 10, 10 are stopped, the pair of pressing claws 11, 11 are both pressed claw slides so that the O-ring 100 is pressed. Slide the part 13 at the same speed and descend.
Furthermore, FIG.6 (b) shows the state which a pair of press nail | claws 11 and 11 fell most.
As shown in FIG. 6B, the pair of pressing claws 11 and 11 are in contact with the guide 2. Note that after the shaft body 4 and the pair of locking claws 10, 10 have passed through the small-diameter opening end 7 (see FIG. 2), the pair of pressing claws 11, 11 can also pass through the small-diameter opening end 7. However, when the pair of pressing claws 11 and 11 come into contact with the guide 2, gaps having a width equivalent to the width of the O-ring 100 are formed between the pressing portions 11 a and 11 a (see FIG. 3) and the stopper member 9. Therefore, the annular groove 52 is not closed by the pair of pressing claws 11, 11. That is, the O-ring 100 fitted in the annular groove 52 is not continuously pressed by the pair of pressing claws 11 and 11.

In addition, the deformation of the O-ring assembled by the O-ring assembling machine according to the present embodiment will be described in more detail with reference to FIGS. 7 (a), 7 (b), 8 (a), and 8 (b) explain the deformation of the O-ring corresponding to the case where the O-ring assembly machine according to the embodiment is operated. FIG. The components shown in FIGS. 1 to 6 are denoted by the same reference numerals in FIGS. 7 and 8, and the description thereof is omitted, and the hatching of the shaft body is also omitted. In FIG. 8, the support 55 is not shown.
First, FIG. 7A corresponds to FIG.
As shown in FIG. 7A, the O-ring 100 is locked symmetrically about the central axis E by the pair of locking claws 10 and 10 (in the front-rear direction in the figure), so that it is substantially horizontal in a side view. Is held to be.
Next, FIG. 7 (b) corresponds to FIG. 5 (b).
As shown in FIG. 7B, the diameter of the small-diameter opening end 7 is smaller than the outer diameter of the O-ring 100, and the diameter of the large-diameter opening end 8 is equal to the outer diameter of the O-ring 100. from the locking part 10a, O-ring 100, which is engaged in 10a is, as the shaft 4 is lowered toward the _{V 1} direction into the interior 3, left and right ends 100a in the drawing, 100a are tapered surface 3b, respectively Start to abut. However, since the central portions 100b of the left and right ends 100a and 100a are locked to the locking portions 10a and 10a, the O-ring 100 starts to bend into a “shape” in a side view. The left and right ends 100a, 100a and the central portion 100b do not indicate specific parts constituting the O-ring 100, but are positions of the O-ring 100 that correspond to the left and right ends and the central portion in a side view. It points to.

FIG. 8A corresponds to FIG. 6A.
As shown in FIG. 8A, the central portion 100b of the O-ring 100 is further bent and deformed into a “U shape” in a side view. More specifically, the central portion 100b reaches the vicinity of the bottom 52a of the annular groove 52, and the left and right ends 100a, 100a reach the vicinity of the small-diameter opening end 7. At this time, the pair of pressing claws 11, 11 is lowered to _{V 1} direction, the left and right ends 100a of the O-ring 100, 100a are pressed respectively pressing portions 11a, by 11a.
Further, FIG. 8B corresponds to FIG. 6B.
As shown in FIG. 8B, when the left and right ends 100a and 100a of the O-ring 100 are pressed by the pressing portions 11a and 11a, the left and right ends 100a and 100a pass through the gap between the shaft body 4 and the small-diameter opening end 7. Go through. Thereafter, the O-ring 100 is restored so that the central portion 100b is disengaged from the locking portions 10a and 10a by the restoring force and is almost horizontal in a side view. Therefore, the O-ring 100 is fitted into the annular groove 52 over the entire circumference. Thereafter, the shaft body 4, the pair of locking claws 10, 10 and the pair of pressing claws 11, 11 are removed from the inside 3 of the guide 2.

As described above, according to the O-ring assembling machine 1 according to the embodiment, the guide 2 is inserted into the hole 51 of the workpiece 50 as shown in FIGS. The pawls 10 and 10 and the pair of pressing claws 11 and 11 are disposed immediately above the workpiece 50 and the guide 2, and the O-ring 100 is locked to the locking portions 10 a and 10 a. The O-ring 100 can be reliably assembled to the annular groove 52 by a simple operation of lowering the pawls 10 and 10 and the pair of pressing claws 11 and 11 at different timings. Accordingly, since it is not necessary to rotate the shaft body 4 around the central axis E in order to completely mount the O-ring 100 in the annular groove 52, the operation for assembling is not complicated.
Further, according to the O-ring assembling machine 1, the guide 2, the shaft body 4, the pair of locking claws 10, 10 and the pair of pressing claws 11, 11 are included, and the opening / closing mechanism as described above is unnecessary. It is. Therefore, since the number of parts is small and the configuration is simpler than that of the prior art, it can be manufactured and introduced at a lower cost.

Further, a tapered surface 3b is formed in the inside 3 of the guide 2, and the pair of locking claws 10 and 10 and the pair of pressing claws 11 and 11 are arranged every 90 degrees around the central axis E of the shaft body 4. By being arranged, a pair of lowermost portions (central portions 100b and 100b) and uppermost portions (left and right ends 100a and 100a) can be formed on the O-ring 100 without difficulty (FIGS. 7B and 8). (See (a)). That is, since it is not necessary to bend only a part of the O-ring 100 into a U shape, the O-ring 100 can be assembled regardless of the diameter.
In addition, since the small-diameter opening end 7 of the guide 2 can pass through the outer peripheral surface 5 of the shaft body 4 while sliding, the shaft body 4, the pair of locking claws 10, 10 and the pair of pressing claws 11. , 11 is prevented from wobbling when descending, so that the O-ring 100 deforms asymmetrically around the central axis E of the shaft body 4 when sliding on the tapered surface 3b of the guide 2, It can prevent that a specific part is rubbed. Therefore, the O-ring 100 can be assembled to the annular groove 52 with high accuracy.
Since the O-ring 100 is easily introduced into the interior 3 of the guide 2, the O-ring 100 is pushed into the interior 3 of the guide 2 by lowering the shaft body 4 while the O-ring 100 is twisted and formed in a twisted state. The risk of damage is reduced. Therefore, the reproducibility of the O-ring assembly is good.

Moreover, since the latching | locking part 10a of the some latching claw 10 is concave shape, the O-ring 100 latched by this does not shift | deviate when the shaft body 4 descend | falls. Therefore, it is possible to bend the O-ring 100 stably.
In addition, by combining the vertical movement speed of the shaft body 4 and the vertical movement speed of the plurality of locking claws 10, etc., it is possible to cope finely with O-rings 100 having different thicknesses. improves.

  The O-ring assembly machine 1 according to the present invention is not limited to the one shown in the present embodiment. For example, the number of the plurality of locking claws 10 and the plurality of pressing claws 11 is not limited to one pair as long as the O-ring 100 is evenly locked and pressed in the circumferential direction. The plurality of locking claws 10 may be fixed so as not to slide along the shaft body 4. Further, the small-diameter opening end 7 may be able to pass through while sliding the outer surfaces of the plurality of claw members 6.

  The present invention can be used as an O-ring assembly machine for assembling an O-ring in an annular groove formed in a hole portion of a workpiece.

  DESCRIPTION OF SYMBOLS 1 ... O-ring assembly machine 2 ... Guide 2a ... One end 2b ... The other end 3 ... Inside 3a ... Circumferential surface 3b ... Tapered surface 4 ... Shaft body 4a ... Tip 4b ... Tip detail 5 ... Outer peripheral surface 6 ... Claw member 7 ... Open end with small diameter 8 ... Open end with large diameter 9 ... Stopper member 10 ... Locking claw 10a ... Locking part 10b ... Fixing part 10c ... Abutting end 11 ... Pressing claw 11a ... Pressing part 11b ... Fixing part 12 ... Engagement Stopper slide part 13 ... Pressing claw slide part 50 ... Work 51 ... Hole part 52 ... Annular groove 52a ... Bottom part 53 ... Bottom 54 ... Pedestal 55 ... Support 100 ... O-ring 100a ... Left and right end 100b ... Center part

Claims (6)

An O-ring assembly machine that assembles an O-ring into an annular groove formed in a hole of a workpiece,
A cylindrical guide inserted into the hole so that one end thereof does not close the annular groove;
A shaft body inserted into and extracted from the inside of the guide;
A plurality of claw members locked to the outer peripheral surface of the shaft body,
The guide has a small diameter at each of the one end and the other end by providing a tapered surface with a diameter decreasing from the other end toward the one end on at least a part of the circumferential surface constituting the inside. Open end and large-diameter open end,
The plurality of claw members include a plurality of locking claws in which the O-ring is locked to each locking portion and the shaft body is inserted into the inside before the shaft body is inserted into the inside. A plurality of pressing claws that press the O-rings locked to the plurality of locking claws,
The plurality of pressing claws are configured to be slidable along a longitudinal direction of the shaft body through a pressing claw slide portion provided on the outer peripheral surface. The plurality of locking claws are a pair of locking claws disposed symmetrically on the outer peripheral surface about the central axis of the shaft body,
The plurality of pressing claws are symmetrically arranged around the central axis, and a pair of pressings arranged on the outer peripheral surface so as to rotate 90 degrees around the central axis with respect to the pair of locking claws. The O-ring assembly machine according to claim 1, wherein the assembly is a claw. The hole is formed with a bottom surface in contact with the annular groove,
The shaft body is provided at its tip with a stopper member capable of contacting the bottom surface of the hole portion in order to limit the insertion of the shaft body into the interior.
The plurality of locking claws each include a contact end that contacts the stopper member when the shaft body is inserted into the interior.
The said latching | locking part is provided in the said contact end vicinity so that it may become the same height as the said annular groove, when the said front-end | tip contacts the said stopper member. O-ring assembly machine.   The small-diameter opening end is open so that the shaft body and the plurality of claw members locked to the shaft body can pass therethrough, and of the outer peripheral surface of the shaft body and the outer surface of the plurality of claw members 4. The O-ring assembly machine according to claim 1, wherein at least one of the O-ring assembly machines can pass while sliding. 5.   The O-ring assembly machine according to any one of claims 1 to 4, wherein the large-diameter open end has a diameter equal to or larger than an outer diameter of the O-ring.   The plurality of locking claws are configured to be slidable along a longitudinal direction of the shaft body via a locking claw slide portion provided on the outer peripheral surface. The O-ring assembly machine of any one of Claims.

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