JP5569683B2 - Escapement - Google Patents

Description

  The present invention relates to an escapement that is used in an escape mechanism that adjusts the interval between parts and pallets that are continuously conveyed or separates parts one by one.

  Conventionally, this type of device has been widely used for escape. For example, a reciprocating follow-up device disclosed in Japanese Patent Application Laid-Open No. 2008-45717 is known. A conventional reciprocating follow-up device includes a linearly movable first and second longitudinally movable members guided side by side in a frame, a longitudinally movable member, and a locking groove that forms a circle when the two abut each other; A drive wheel having a linear drive groove orthogonal to the moving direction, an arcuate locking portion that fits into the lock groove, and a drive portion that is a roller that fits into the drive groove, and a drive wheel attached to the frame side When the drive wheel is rotated around the rotation axis by the drive source, the roller moves in the drive groove, while the one front-rear moving member is moved backward, This is provided with a structure in which the other front-rear moving member is prevented from moving in the front-rear direction by the arc-shaped locking portion (Patent Document 1).

  This is because the other back and forth moving member on the side where the locking portion is located is fitted into the locking groove by inserting the arc-shaped locking portion into the locking groove, even if the locking portion rotates together with the drive wheel. Can be prevented (locking operation), and by rotating as it is, the other forward / backward moving member is transferred to one forward / backward moving member, and this time, the forward / backward moving member is prevented from moving relative to the other. It is excellent in that it has a structure that can

JP 2008-45717 A

  However, the conventional reciprocating follow-up device has the following problems when the front-rear moving member is used with the posture facing upward. FIGS. 1A, 1B and 1C are plan views schematically showing the operation of a conventional reciprocating follow-up device. In FIG. 1 (a), a first longitudinally moving member 2 and a second longitudinally moving member 3 are arranged in parallel to the frame 1 and are slidable with respect to the frame 1. The first and second longitudinally moving members 2 and 3 have driving grooves 4a and 4b and locking grooves 5a and 5b, respectively. Reference numeral 6 denotes a driving roller, which rotates integrally with a driving wheel 7 (shown separately in FIG. 1C) and is fitted over one or both of the driving grooves 4a and 4b. .

  In FIG. 1A, the first back-and-forth moving member 2 is in the lowered end position, and the second back-and-forth moving member 3 is in the raised end position. When the drive wheel 7 is rotated clockwise around the rotation shaft 9 (FIG. 1C) using the rotary actuator as a drive source as in the conventional case, the drive roller 6 revolves clockwise around the rotation shaft 9. The first back-and-forth moving member 2 is raised by moving in the central direction along the driving groove 4a while rotating around the roller shaft 10.

  When the first back-and-forth moving member 2 moves to the rising end position, as shown in FIGS. 2 (a) to (d), the relationship between the driving grooves 4a and 4b and the driving row 6 is enlarged. The first longitudinally moving member 2 and the second longitudinally moving member 3 are juxtaposed in the left-right direction at the ascending end position (b), the driving grooves 4a and 4b are aligned in a straight line, and the locking grooves 5a and 5b are circular. It becomes. Then, the drive wheel 7 continues to rotate in the clockwise direction, so that the drive roller 6 is transferred to the drive groove 4b of the second back-and-forth moving member 3.

  As shown in FIG. 2, when the driving roller 6 is transferred to the driving groove 4b of the second back-and-forth moving member (c), the first back-and-forth moving member 2 is not supported by the driving roller 6 in the vertical direction. A load due to gravity acts on the first back-and-forth moving member 2 downward. On the other hand, since there is a clearance between the locking portion 8 and the locking groove 5a, the first back-and-forth moving member 2 falls to eliminate the clearance, and the tip of the locking portion 8 is the peripheral wall surface of the locking groove 5a. Drops to the position where it hits (* position) and stops. In other words, at the ascending end position, the first back-and-forth moving member 2 that has become unsupported by the transfer of the driving roller 6 is dropped with respect to the back-and-forth moving member 3 to which the driving roller 6 is transferred, and both the front and rear moving members are placed. A step d is generated between the second and third drive grooves 5a and 5b due to a positional shift.

  Thereafter, when the drive wheel 7 further rotates clockwise and the second back-and-forth moving member 3 moves to the lower end position by the revolution of the driving roller 6 (not shown), the rotary actuator rotates in the reverse direction. When the rotary actuator rotates in the reverse direction, the driving roller 6 revolves counterclockwise about the rotation shaft 9 and moves in the center direction of the frame along the driving groove 4b while rotating about the roller shaft 10. As a result, the second back-and-forth moving member 3 rises.

  When the second back-and-forth moving member 3 moves to the rising end position, the driving roller 6 moves from the driving groove 4b to the driving groove 4a. As described above, the first back-and-forth moving member 3 2 is in a fallen state, there is a step (b) between the driving grooves 4a and 4b, and the driving roller 6 cannot smoothly transfer from the driving groove 4b to the driving groove 4a (d). For this reason, there is a risk of premature failure due to noise or wear due to impact. This impact occurs in both directions when the driving roller 6 moves from one to the other in the driving grooves 4a and 4b.

The problem to be solved by the present invention is that when one of the front and rear moving members moves to the front end position ( ascending end position ) and the driving roller moves to the other front and rear moving member, the transfer can be smoothly performed, thereby reducing noise. An object of the present invention is to provide an escapement that can reduce and improve durability.

An escapement according to a first aspect of the present invention includes a first longitudinally movable member and a second longitudinally movable member which are guided in parallel with each other in parallel with the frame, a driving source, and a rotating shaft by the driving source. A drive wheel that rotates integrally,
The first and second back-and-forth moving members are arranged symmetrically with respect to the center line between the first and second back-and-forth moving members in a state where these two back-and-forth moving members are abutted. A drive groove that is a straight groove perpendicular to the moving direction, a circular support groove that forms a circle, and a semicircular lock groove that forms a circle concentrically with the drive groove are formed symmetrically. ,
The drive wheel includes a drive roller that fits in the drive groove, an auxiliary roller that fits in the arc-shaped support groove and is disposed at a position opposite to the drive roller with the rotation shaft interposed therebetween, and similarly the drive wheel. A locking portion disposed at a position opposite to the rotation shaft with respect to the roller , the locking portion being concentric with the locking groove and having a semicircular shape having substantially the same diameter;
The drive source is attached to the frame body, and revolves the drive wheel in half rotation around the rotation axis.
When the driving roller and the auxiliary roller are on the center line, the first and second back-and-forth moving members both take a front end position in linear movement.
It is characterized by that.

When the driving roller 6 passes through the place where both the first and second front and rear moving members 2 and 3 are at the front end position, the front and rear moving member on the side where the support by the driving roller disappears due to the passage is the rotation shaft. Since it is supported by the auxiliary roller that has moved into the support groove on the opposite side, the fall of the locking portion and the locking groove is prevented from falling downward, and the drive roller again moves to the same location. When passing in the opposite direction, it is possible to prevent the generation of noise and premature wear due to the steps caused by the fall.

The top view which showed the principal part of the conventional escapement (one side is an upper end position). The top view which showed the principal part of the conventional escapement (both are upper end positions). The perspective view which showed the whole escapement. The top view which looked at the escapement from the lower side (drive wheel is removed). (A) is a top view of a drive wheel, (b) is a longitudinal cross-sectional view along the center line AA (FIG. 4) of FIG. FIG. 5 is a cross-sectional view taken along line BB in FIG. 4. (A), (B), (C), and (D) are plan views for explaining the operation of the escapement. The figure which showed simply the other example regarding a locking part. The figure for comparing the fall amount by clearance.

  FIG. 3 is a perspective view showing the escapement 11 according to the embodiment of the present invention. The escapement 11 is attached to a device to be used with a bolt. The escapement 11 includes a frame body 12, a first back-and-forth moving member 13, a second back-and-forth moving member 14, and a rotary actuator 15 as a drive source.

FIG. 4 is a plan view showing a state in which the first back-and-forth moving member 13 and the second back-and-forth moving member 14 disposed inside the frame 12 are abutted at the front end position, and FIG. FIG. 4 is a plan view of a drive wheel 17 disposed inside the body 12.
As shown in FIG. 5 , the escapement 11 includes a driving wheel 17, a locking portion 18, a driving roller 19, and an auxiliary roller 20 that are connected to each other by a rotary actuator 15 and a rotating shaft 16 inside the frame body 12.

  The rotary actuator 15 is one in which a single vane fixed to the rotary shaft 16 is reciprocated within a range of 180 degrees by air pressure, and is attached to the upper surface of the frame 12 with the rotary shaft 16 directed vertically downward. Yes. The rotation shaft 16 penetrates from the upper surface of the frame body 12 to the inside, and a drive wheel 17 is integrally attached to a tip end portion thereof by a set screw 21. The locking portion 18 is semicircular as a whole, and is provided integrally with the drive wheel 17 in such a manner that the wall thickness is increased from the center portion of the lower surface of the drive wheel 17. A driving roller 19 is provided on the lower surface of the driving wheel 17 at the upper center so as to be rotatable about a roller shaft 22. The driving roller 19 and the auxiliary roller 20 are disposed on the opposite side of the locking portion 18 with the rotating shaft 16 in between. The auxiliary roller 20 is provided on the inner side of the driving roller 19 in the radial direction (closer to the rotating shaft 16 than the driving roller 19) and rotatable about the roller shaft 23.

  The locking part 18 has a first locking part 24 having a semicircular shape concentric with the rotary shaft 16 at a lower position in the figure, and over 180 ° positions on both sides in the rotational direction (180 in this embodiment). A second lock portion 25 having a smaller diameter than the first lock portion 24 and having a semicircular shape concentric with the rotary shaft 16 is integrally formed (at a position above the phase difference of °).

As shown in FIGS. 3 and 4 , the first and second back and forth moving members 13 and 14 are arranged in the up and down direction in the figure with the center line AA between them as the center in a state where they are abutted along the front and back surface . It is a symmetric form. In addition, since the 1st and 2nd back-and-forth moving members 13 and 14 are the same structures, in description of a part, it distinguishes using additional code | symbol a and b.

  The first back-and-forth moving member 13 is composed of a substantially rectangular slider 26a and a shaft 27a made of a round steel bar. The first back-and-forth moving member 13 allows the shaft 27a to pass through a through-hole 28 in the front-rear direction provided in the slider 26a. 26a is fixed integrally. The shaft 27a is slidably guided in the front-rear direction of the frame body 12 through sliding bearings 29a provided at the front end and the rear end of the frame body 12 (FIG. 4). A front portion (upper portion) of the shaft 27a protrudes from the front end of the frame body 12, and a work implement for handling a workpiece is attached to the end portion. The same applies to the second back-and-forth moving member 14.

  The first and second back-and-forth moving members 13 and 14 have sliders 26a and 26b juxtaposed side by side in the frame 12 and are guided by the frame 12 so as to be movable in the front-rear direction (up and down in the figure). The actuators 15 are alternately driven. At the center in the width direction of the frame body 12, a detent pin 30 supported respectively at the front end and the rear end of the frame body 12 is installed, and the abutting surface side of each of the sliders 26 a and 26 b located at the center in the width direction of the frame body 12 is It is fitted to the outer peripheral surface of the rotation prevention pin 30, and the first and second back-and-forth movement members 13, 14 are prevented from rotating around the shafts 27a, 27b, respectively.

  When the two sliders 26a and 26b are brought into contact with each other on the upper surfaces of the sliders 26a and 26b, the driving grooves become circular locking grooves 31a and 31b and linear grooves orthogonal to the moving direction of the front and rear moving members 13 and 14. Grooves 32a and 32b and arc-shaped support grooves 33a and 33b that form a circle are formed, and in addition to these, escape and contact grooves 34a and 34b are formed respectively.

  The locking grooves 31a and 31b partially overlap with the driving grooves 32a and 32b. In this embodiment, the support grooves 33a and 33b are formed in an annular shape on the bottom surfaces of the locking grooves 31a and 31b inside the locking grooves 31a and 31b. Furthermore, the locking grooves 31a and 31b and the relief / contact grooves 34a and 34b are relatively shallow, while the driving grooves 32a and 32b and the supporting grooves 33a and 33b are formed deep. The relief and abutment grooves 34a and 34b have an arc shape obtained by cutting a part of the second lock portion 25 of the locking portion 18 with a string (FIG. 7A), and the groove walls 35a and 35b are the locking portions. This space is an arc having the same diameter as the 18 second lock portions 25.

  The driving wheel 17 is disposed with the locking portion 18 fitted in the locking grooves 31a and 31b, the driving roller 19 fitted in the driving grooves 32a and 32b, and the auxiliary roller 20 fitted in the support grooves 33a and 33b. (Fig. 7 (a) (b)). The rotating shaft 16 is located on the center line AA between the first and second sliders 26a, 26b of the two back-and-forth moving members 13,14.

[Operation]
FIG. 7 is a plan view for explaining the operation of the escapement 11 of this embodiment. Since FIG. 7 (a) is complicated, only the parts necessary for explanation of the operation are shown in the same (b).
7A and 7B, the slider 26a is at the rearward movement end position (rear end position) , and the slider 26b is at the frontward movement end position (front end position) .
As seen in FIG. 7 (b), the groove wall 35a of the end position is missed shared those Semmizo 24a after the slider 26a is determined at which contact with the second locking portion 25 of the locking portion 18. At this time, in this embodiment, the second locking portion 25 is so are a smaller diameter than the first locking portion 24, the end position after the amount corresponding the diameter is small is lower. That is, it is possible to increase the back-and-forth movement stroke of the first and second back-and-forth movement members 13 and 14. Further, the upper portions of the sliders 26a and 26b above the driving grooves 32a and 32b, that is, the escape / contact grooves 24a and 24b are arranged here. it can. As a result, the weight of the sliders 26a and 26b is reduced, and the inertia is reduced when the vertical movement is started and stopped.
FIG. 8 simply shows the case where the first and second lock portions 24 and 25 have the same diameter for comparison. Second lock portions 25 are formed on both sides of the semicircular first lock portion 24 in the rotational direction beyond the position of 180 °.
In FIG. 7B, when the drive wheel 17 rotates clockwise about the rotary shaft 16 using the rotary actuator 15 as a drive source, the driving roller 19 rotates clockwise about the rotary shaft 16 as in the prior art. The slider 26a moves forward by moving in the central direction along the driving groove 32a while rotating around the roller shaft 22 while revolving. Simultaneously with the driving roller 19, the auxiliary roller 20 revolves clockwise around the rotation shaft 16 along the support groove 33 while rotating around the roller shaft 23.

When the slider 26a moves to the front end position, as shown in FIG. 7 (c), the slider 26a and the slider 26b are juxtaposed in the left-right direction at the front end position and are brought into a butting state, and the driving grooves 32a and 32b are aligned in a straight line. To do. Further, the support grooves 33a and 33b are continuous as arcs, and the locking grooves 31a and 31b are circular. The driving roller 19, the locking portion 18, and the auxiliary roller 20 are located on the center line AA between the sliders 26a and 26b, and are disposed across the portions on both sides.

As the drive wheel 17 continues to rotate in the clockwise direction, at the front end position, the drive roller 19 moves from the drive groove 32a on the side that has moved forward to the drive groove 32b on the side that has stopped. The auxiliary roller 20 is transferred from the support groove 33b on the side where the auxiliary roller 20 is stopped to the support groove 33a on the side that has moved forward . That is, the auxiliary roller 20 that possess the support groove 33a on the side which has moved forward, it is possible to support the load of the front and rear moving members 13 on the side which has been moved forward in the auxiliary low La 20. For this reason, generation | occurrence | production of the level | step difference d by dropping a part for clearance as before is prevented.

Thereafter, the drive wheel 17 further rotates in the clockwise direction, the drive roller 19 moves to the drive groove 32b, and the drive roller 19 revolves in the clockwise direction around the rotation shaft 16 while centering on the roller shaft 22. The slider 26b moves backward by moving to the right along the driving groove 32b while rotating as shown in FIGS. At this time, the slider 26a moves in the front-rear direction in relation to the groove wall of the locking groove 31a because the first locking part 24 of the locking part 18 goes over 90 ° into the locking groove 31a. Therefore, the slider 26b does not move downward. That is, the slider 26a is a stop-side slider in which the front end position is maintained.

When the clockwise rotation of the drive wheel 17 reaches 180 °, the backward movement of the slider 26b is stopped. At this time, the first locking portion 24 of the locking portion 18 is fitted into the locking groove 31a of the slider 26a, and the second locking portion 25 enters the escape / contact groove 34b of the slider 26b and its groove wall 35b. Is in contact with the outer peripheral surface of the second lock portion 25 on a surface having the same arc. For this reason, when the forward / backward moving member 14 stops , the inertial force directed rearward is received by the second lock portion 25 and eventually absorbed by the frame body 2, so that the drive portion of the rotary actuator 15 has a rotational direction. There is no impact.

Next, the rotary actuator 15 rotates in the reverse direction. When the rotary actuator 15 rotates in the reverse direction, the driving roller 19 revolves counterclockwise around the rotation shaft 16 and moves in the central direction along the driving groove 32b while rotating around the roller shaft 22. The front / rear moving member 14 moves forward . Simultaneously with the driving roller 19, the auxiliary roller 20 revolves counterclockwise along the support groove 33 a about the rotation shaft 16 while rotating about the roller shaft 23.

When the back-and-forth moving member 14 moves to the front end position, as shown in FIGS. 7C and 7D, when the back-and-forth moving member 13 on the stop side slider 26a side is supported by the auxiliary roller 20 as described above , Since the front end position is maintained , there is no step between the driving groove 32b and the driving groove 32a. Even if the escapement 11 of this embodiment is used in the vertical direction with the front end side up, the driving use roller 19 can possess a smooth driving groove 32a. For this reason, generation | occurrence | production and abrasion of the noise by an impact sound are eliminated.
Further, since the auxiliary roller 20 is disposed opposite to the driving roller with the rotation shaft in between, the auxiliary roller 20 causes the auxiliary roller 20 to drop due to the clearance between the locking portion 18 and the locking grooves 35a and 35b. Since it supports in the direction along the diameter of the up-and-down direction like A part of FIG. 9, it is more advantageous than supporting in the part where the fall amount becomes large like B part of FIG. In addition, the numerical value in a figure is an example and is the case where the diameter of the grooves 35a and 35b for locking is 30 mm, and the diameter of the locking part 18 is 29.95 mm.

DESCRIPTION OF SYMBOLS 1 Frame 2 1st back-and-forth moving member 3 2nd back-and-forth moving member 4a, 4b Driving groove 5a, 5b Locking groove 6 Driving roller 7 Driving wheel 8 Locking part 9 Rotating shaft 10 Roller shaft 11 Escapement 12 Frame Body 13 First back and forth moving member 14 Second back and forth moving member 15 Rotary actuator 16 Rotating shaft 17 Drive wheel 18 Locking portion 19 Driving roller 20 Auxiliary roller 21 Set screw 22 Roller shaft (for driving roller)
23 Roller shaft (for auxiliary roller)
24 1st lock part 25 2nd lock part 26 Slider 27 Shaft 28 Through hole 29 Sliding bearing 30 Non-rotating pin 31 Locking groove 32 Driving groove 33 Supporting groove 34 Relief / contacting groove 35 Groove wall

Claims (2)

  First and second back-and-forth moving members that are juxtaposed parallel to each other and guided in a linearly movable manner, a drive source attached to the frame, and a drive shaft that is attached to the frame and has a rotation shaft. An escapement having a rotating drive wheel,
  In the state where the first and second back-and-forth moving members abut each other along the surface in the front-rear moving direction, and both are in the front end position,
  Linear drive grooves that are linear grooves orthogonal to the moving direction of the longitudinally moving member,
  A semicircular support groove that is a circle around the rotation axis of the drive wheel
  Each has a semicircular locking groove that is a circle centered on the rotational axis of the drive wheel,
  The drive wheel is reciprocatingly rotated about the rotation shaft by the drive source, and has a drive roller, an auxiliary roller, and a locking portion, and the rotation shaft is disposed immediately above the butting surface of the front and rear moving member. And
  The driving roller is fitted in the driving groove and can move in the driving groove.
  The auxiliary roller is disposed at a position facing the driving roller across the rotation shaft and is movable in the support groove.
  The locking portion is formed of a thick portion that is a semicircle centered on the rotation axis of the drive wheel, and is disposed at a position opposite to the drive roller across the rotation shaft with the same diameter as the locking groove. It can be rotated in the locking groove,

  An escapement characterized in that when both the driving roller and the auxiliary roller are directly above the butting surface of the longitudinally moving member, the first and second longitudinally moving members are both at the front end position in linear movement.   In the state where the first and second back-and-forth moving members abut each other along the surface in the front-rear moving direction, and both are in the front end position,
  In addition, each has a half-cut-off relief and contact groove, which is a circular cut around the rotation axis of the drive wheel,
  The locking portion of the drive wheel has the same diameter as the locking groove and can be rotated in the locking groove, and has a small diameter on the side facing the first locking portion with respect to the rotation axis of the driving wheel. And a semi-circular second lock portion, the diameter of the second lock portion is the same as the diameter of the cut circle, and when the first and second back-and-forth moving members are in the rear end position, 2. The escapement according to claim 1, wherein two lock portions are fitted in one of the escape / contact grooves and are rotatable.