JPS6229646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a follower roller that rotates in contact with a guide surface formed by an annular body or a portion thereof.

What is shown in FIG. 1 is an example of a conventionally known roller gear intermittent rotation drive device, and this device has a protrusion C having a series of spiral portions a and linear portions b on the outer periphery of the main drive shaft A. A cylindrical cam d with a protrusion is provided, the driven shaft B is separated from the main driving shaft A and perpendicular to the main driving shaft A, as shown in FIG. On the outer periphery of the disc e, a plurality of follower rollers f are provided at a constant pitch p in contact with both side surfaces C ₁ and C ₂ of the protrusion C. That is, as shown in FIG _{. 2B} , such a device has a guide surface (projection C (hereinafter referred to as guide surface C ₁ ), and rotates in contact with _the central axis _of rotation O ₃ −O ₃ .
It can be said that this is a device in which there is a follower roller f which intersects with the central axis O ₁ -O ₁ .

In such a device, as shown in Fig. 2A, when looking at the side surface of the protrusion C, for example, the side surface _C1 , a point on the side surface _C1 is located from the central axis O1- _O1 of the driving shaft _A. Since the radii r ₁ and r ₂ of the points are different,
The circumferential speeds at each point are different. Therefore, between the side surface C ₁ and the outer circumferential surface of the follower roller f in contact with the side surface C ₁ , there will always be a rolling contact point and a sliding contact point, and the sliding contact point will cause a friction phenomenon. . Therefore, when used for a long period of time, both the protrusion C and the follower roller f wear out, resulting in a decrease in the accuracy of the angle of the movement of the driven shaft B, for example, the intermittent rotational movement, or vibrations are generated. An object of the present invention is to provide a follower roller that rotates in contact with a guide surface or a guide surface forming a part thereof, which can eliminate the above-mentioned drawbacks.

The structure will be explained based on an embodiment shown in FIG. 3. In this embodiment, the present invention is applied to a follower roller of a roller gear intermittent rotation drive device. A is provided with a cylindrical cam d protruding from its outer periphery with a protrusion C having a series of spiral portions a and linear portions b, and the driven shaft B is spaced apart from and orthogonal to the main driving shaft A. In the roller gear intermittent rotation drive device, a disk e is provided, and a plurality of follower rollers f are provided at a constant pitch p on the outer periphery of the disk, the rollers f contacting both side surfaces C ₁ and C ₂ of the protrusion C. The follower roller f is characterized in that it is constituted by an assembly consisting of a plurality of (two in FIG. 3) dividing rollers f ₁ and f ₂ .

Since this embodiment has the above-mentioned configuration, in _{FIG .}
Even though the circumferential speeds at each point above are different because the radii r ₁ and r ₂ from O ₁ are different, the two divided rollers f ₁ and f ₂ have different circumferential speeds in the same rotation direction. The bearings are driven at different speeds and have rolling contact at least at points, so there is no slipping and no wear. Incidentally, since the circumferential speed on the side surface _C1 of the protrusion changes steplessly, the greater the number of divisions of the follower roller f, the fewer places where slips occur.

Since this invention has the structure and operation as described above, even when used for a long time, the side surface of the protrusion C which is a guide surface
It is possible to provide a follower roller that rotates in contact with a guide surface forming an annular body or a part thereof, in which _C1 and the follower roller f do not easily wear out, and therefore do not require parts replacement or repair.

In addition, to illustrate embodiments 2 _and 3 in which the present invention can be used, _FIG . , 2 are installed, and the rails 1, 2
This transfer device is equipped with a pair of follower rollers f that clamp both side surfaces C ₁ and C ₂ of the protrusion C on the lower surface of the pallet plate 3 that is engaged with and guided by the pallet plate 3. The purpose of preventing sliding contact is achieved by constructing the follower roller f as an assembly consisting of split rollers f ₁ and f ₂ . In this example, the side surfaces C ₁ and C ₂ of the protrusion C of the cylindrical cam d are projected onto a plane P through which the central axis O ₁ −O ₁ perpendicularly extends, forming a guide surface forming an annular body Q with a constant width m. Corresponding to the central axis of the follower roller f
O ₃ −O ₃ intersects the central axis O ₁ −O ₁ .

FIG. 5 shows a small-end cam surf ace 5 of a cylindrical body 4, in which a follower roller f provided at one end of a swinging rod 6 comes into contact with the cam surfing ace 5, causing the swinging rod 6 to swing. However, in this device as well, the follower roller f is divided into divided rollers f ₁ and f ₂
The purpose of preventing sliding contact can be achieved by constructing an assembly consisting of the following. In this example, the cam surf ace 5 at the small end of the cylindrical body 4
corresponds to a guide surface forming an annular body Q having a constant width m, and _the central axis O 3 -O ₃ of the follower roller f is the same as the central axis O ₃ -O ₃ projected onto a plane P through which the central axis O 1 -O 1 perpendicularly penetrates. Intersects O ₁ − O ₁ . The guide surface C ₁ in this embodiment is a cam surf ace 5.

In FIG. 6, a spiral guide hole 8 is provided in the peripheral wall of a cylindrical body 7, and a lifting rod 9 is provided in the center of the cylindrical body 7.
When a follower roller f protruding in the radial direction from the lifting rod 9 is fitted into the guide hole 8 and the lifting rod 9 is rotated by a certain angle in both forward and reverse directions, the lifting rod 9 The follower roller f moves through the guide hole 8 while being guided by the guide surface 10 of the hole, and as a result, the lifting rod 9 moves up and down. _f1 ,
The purpose of preventing sliding contact can be achieved by constructing an aggregate consisting of _f2 . In this example, the guide surface 10 of the guide hole 8 is aligned with the central axis O _1
-O1 corresponds to the guide surface forming a part Q' of the annular body Q whose projection onto the plane P that penetrates at right angles,
The center axis O ₃ -O ₃ of the follower roller f intersects with the center axis O ₁ -O ₁ . Guide surface C ₁ in this example
is the central axis 10.

In FIG. 7, a disk 13 having a cam surf ace 12 on the lower surface of the circumference is fixed to a fixed shaft 11, and the fixed shaft 1
1 and rotated by a gear 13
4 is provided with a lifting rod 15 in a direction parallel to the direction of the central axis O ₁ -O ₁ of the fixed shaft 11, and the central axis O ₃ -O ₃ is provided at the tip of the lifting rod 15 in the radial direction of the rotating frame 14.
A follower roller f is provided, and the follower roller is brought into pressure contact with the cam surf ace 12 by a coil spring 16 provided on the elevating rod 15, and when the rotating frame 14 is rotated, the cam surf ace 12, the lifting rod 12 is raised and lowered, and in this device as well, the purpose of preventing sliding contact can be achieved by constructing the follower roller f as an assembly consisting of divided rollers f ₁ and f ₂ . In this example, the cam surf ace 12 corresponds to a guide surface whose projection onto a plane P through which the central axis O ₁ - O ₁ perpendicularly forms an annular body Q with a constant width, and the central axis of the follower roller f. O ₃
−O ₃ intersects with the central axis O ₁ −O ₁ .

In addition, 15' in FIG. 7 indicates a guide rod. The guide surface C ₁ in this embodiment is a cam surf ace 12 .

FIG. 8 shows two pairs of rollers f ((Follower roller f in FIG.
Only the pair of rollers facing inward is visible))
is provided so as to be able to roll on a pair of rails 18 and 19, and a chain support plate 20 is vertically disposed at the center of the lower surface of the pallet plate 17, and an endless chain 21 is fixed to the plate 20. 21 is designed to be driven by a pair of chain wheels 22, and rails 18 and 19 are driven by a pair of chain wheels 22.
The outer periphery of the chain wheel 22 forms a concentric semicircle centered on the center of the chain wheel 22. chain wheel 22
When rotated, each pallet plate 17 is driven by an endless chain 21, and each pallet plate 17 moves on a pair of rails 18 and 19. Also in this device, _the chain wheel ₂
When rotating around the rails 18 and 19, the purpose of preventing sliding contact between the rails 18 and 19 is achieved. In this case, the rails 18 and 19 around the chain wheel 22 are projected onto a plane P through which the central axis O ₁ - O ₁ of the chain wheel 22 passes at right angles, and a portion Q' of the annular body Q having a constant width m is The center axis O ₃ -O ₃ of the follower roller intersects with the center axis O ₁ -O ₁ . The guide surface C ₁ in this embodiment is the semicircular surface of the rails 18, 19.
Note that 19' in FIG. 8B shows a window provided in the wall of the rail 19, through which a part of the chain wheel 22 passes.

In FIG. 9, a rotating shaft 24 is vertically set up on the machine stand 23, a disk 25 is fixed to the shaft 24, and the disk 25 is radially moved from the center axis O ₁ -O ₁ of the rotating shaft 24 to the machine stand 23. The disc 25 is supported by a follower roller f disposed above, and when the rotating shaft 24 is rotated, the disk 25 rotates on a plurality of follower rollers f.
The purpose of preventing sliding contact can be achieved by constructing the roller as an assembly consisting of divided rollers f ₁ and f ₂ . In the case of this example, the surface 26 that contacts the rollers f ₁ and f ₂ on the outer periphery of the disk 25 is projected onto a plane P through which the central axis of rotation O ₁ -O ₁ of the disk 25 passes through at right angles to an annular body Q having a constant width m. The central axis O ₃ -O ₃ of the follower roller f intersects with the central axis O ₁ -O ₁ . The guide surface C ₁ in this embodiment is the annular surface 26 on the back surface of the disk 25 .

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventionally known roller gear type intermittent rotation drive device, FIG. 2A is an explanatory diagram of the operation, FIG. 4, 5, 6, 7, 8, and 9 are explanatory diagrams of one embodiment of a follower roller that rotates in contact with the annular body or a guide surface forming a part thereof, FIGS. 4, 5, 6, 7, 8, and 9 are explanatory diagrams of other embodiments, f is a follower roller, f ₁ and f ₂ are divided rollers, O ₁ - O ₁ is a central axis, and p is a central axis O ₁ - O ₁ passes through at right angles. Q is the annular body, Q' is a part of the annular body, and O ₃ -O ₃ is the rotation center axis of the follower roller f.

Claims (1)

[Claims] 1 The projection onto a plane P provided around the central axis O ₁ -O ₁ and through which the central axis O ₁ -O ₁ passes at right angles is on the guide surface C ₁ forming the annular body Q or a part Q' thereof. , the rotation center axis O ₃ −O ₃ is the center axis O ₁
A portion of the follower roller f that rotates in contact with one side of the follower roller f provided at a position intersecting with _the guide surface _C1 ,
An annular body characterized by being constituted by an assembly consisting of a plurality of divided rollers f ₁ and f ₂ that rotate in the same direction while contacting the same guide surface or rotating in contact with the guide surface forming a part of the annular body. hollow roller.