JP7593187B2 - Roller device and motion conversion mechanism using the same - Google Patents

Description

This invention relates to a roller device that is used in contact with a cam and a motion conversion mechanism that uses the roller device.

A multi-stage forging press machine, in which multiple forging sections equipped with dies and punches are arranged side by side in the horizontal direction, is provided with a transfer device that clamps the workpiece and transports it to the forging section for the next process. In the transfer device, a mechanism that converts the rotational motion of the drive source into the desired linear motion is generally adopted in which a roller attached to one end of a swingable lever is pressed against the outer peripheral surface (cam surface) of a cam (see, for example, Patent Document 1 below).

Figure 7 shows an example of this, with roller 102 pressed against cam surface 100a of cam 100. Reference numeral 104 denotes a rocking lever that rocks around support shaft 105. As shown in the figure, the position of rocking lever 104 is determined by the contact between cam surface 100a and roller 102.

In such a motion conversion mechanism, as shown by the two-dot chain line in Figure 7, if the cam surface 100a is scraped off due to wear or correction for smoothing to form a new cam surface 100a', a roller diameter compatible with the new cam surface 100a' must be determined, a new roller 102' must be made from material, and attached to the rocking lever 104, and this adjustment work takes time. In particular, in a structure with multiple cams in one mechanism, the operation of one cam affects the operation of the other cams, making it very difficult to adjust each cam. For this reason, when this mechanism has two cams, the adjustment work takes a lot of time.

JP 2013-78791 A

The present invention was made against the background described above, with the objective of providing a roller device that can easily adjust the position of the roller outer surface that contacts the cam surface, and a motion conversion mechanism using the same.

The roller device of the present invention comprises a roller that rotates in contact with a cam as a mating member,
a shaft body supporting the roller, the shaft body having a roller attachment portion formed at the center in the axial direction, the roller attachment portion being offset from a reference axis defined as a common central axis at both ends;
a bracket having mounting holes into which both ends of the shaft are inserted;
a fixing means for fixing an end of the shaft body to a mounting hole of the bracket;
Equipped with
The present invention is characterized in that the distance from the mounting hole to the outer surface of the roller in a predetermined direction is adjustable based on the relative rotation of the shaft body with respect to the bracket.

With the roller device of the present invention thus defined, the distance from the mounting hole of the bracket to the roller outer surface that abuts against the cam surface is determined by the amount of eccentricity of the shaft and the outer diameter of the roller. Therefore, the position of the roller outer surface that abuts against the cam surface can be easily adjusted by relatively rotating the shaft inserted into the mounting hole and changing the amount of eccentricity in the direction of the cam surface, without changing the diameter of the roller itself.

In the roller device of the present invention, the fixing means is
A tapered portion formed at an end of the shaft body;
a threaded portion formed on an end of the shaft and extending in an axial direction;
a sleeve member having a wedge-shaped cross section disposed between an end of the shaft body and an inner peripheral surface of the mounting hole;
a fixing force adjustment member that presses the sleeve member in the axial direction while being screwed into the threaded portion;
The configuration may include the following.

In this way, the shaft body can be fixed in an unrotatable state in the mounting hole after being rotated to the desired angle based on the rotation operation of the fixing force adjustment member.

In the roller device of the present invention, the threaded portion formed on the end of the shaft body is a female threaded portion, and the female threaded portion is formed at a position overlapping with the tapered portion in a direction perpendicular to the axis,
The fixing force adjustment member may be formed with a male thread portion that screws into the female thread portion.
In this way, the axial dimension of the roller device can be reduced. For example, the fixing means can be housed within the bracket, and interference with surrounding objects can be prevented.

The motion conversion mechanism of the present invention includes a cam that rotates around a drive shaft and a roller portion that contacts a cam surface of the cam, and converts the rotational motion of the drive shaft into linear motion,
The roller unit is characterized in that it is constructed using the roller device of the present invention.
According to the motion conversion mechanism of the present invention thus defined, it is possible to achieve the same effects as the roller device of the present invention described above.

FIG. 1 is a schematic diagram of a transfer device including a roller device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the roller device. FIG. 3 is a cross-sectional view showing the roller device disassembled into its component parts. FIG. 4 is a perspective view showing the roller device disassembled into its component parts. FIG. 5 is a schematic diagram showing the position of the outer surface of the roller with respect to the reference axis in the VV cross section of FIG. FIG. 6 is an explanatory diagram of the operation of the roller device. FIG. 7 is a diagram for explaining the problems with the conventional motion conversion mechanism.

Next, a roller device according to one embodiment of the present invention and a motion conversion mechanism using the same will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a transfer device configured to include a roller device according to one embodiment of the present invention. In the figure, 1 is a transfer device provided in a multi-stage forging press machine in which multiple forging sections equipped with dies and punches (not shown) are arranged in parallel in the horizontal direction, and the transfer device clamps the workpiece W and transports it to the forging section of the next process located in the approximately horizontal direction.

The transfer device 1 is equipped with an upper clamper 6 having a pair of openable and closable gripping claws 4, 4, and a lower clamper 10 having a pair of fixed claws 8, 8 with a fixed distance between the claws, and is configured to grip the workpiece W with these four claws 4, 4, 8, 8.

The transfer device 1 is equipped with a movement mechanism 13 for moving the clampers 6 and 10 horizontally toward the adjacent forging section. The movement mechanism 13 is a motion conversion mechanism that converts the rotational motion of the drive shaft 15 into linear motion, and is composed of a drive shaft 15, cams 14, 16, a swing lever 18, a connecting member 22, an upper slide bar 24 and a lower slide bar 25 arranged parallel to each other, etc.

The cams 14 and 16 are fixed to the drive shaft 15 and rotate together with the drive shaft 15 when the drive shaft 15 is rotated by a driving means (not shown).

The rocking lever 18 has a roller 20 at its end, which extends downward in the figure, that abuts against the cam surface (outer peripheral surface) 14a of the cam 14, and a roller 20B at its end, which extends leftward in the figure, that abuts against the cam surface 16b of the cam 16. These rollers 20, 20B are appropriately biased toward the cam surfaces 14a, 16b by a biasing means (not shown), so that the rollers and the cam surfaces are appropriately pressed against each other. When the cams 14 and 16 rotate in response to the rotation of the drive shaft 15, the roller 20 rolls on the cam surface 14a of the cam 14 at a predetermined timing, and the roller 20B rolls on the cam surface 16b of the cam 16, and the rocking lever 18 itself rocks around the support shaft 19. Meanwhile, the end of the rocking lever 18 that extends upward is connected to a connecting member 22.

Of the slide bars 24, 25, an upper clamp base 26 with multiple upper clampers 6 arranged side by side is fixed to the upper slide bar 24, and a lower clamp base 27 with multiple lower clampers 10 arranged side by side is fixed to the other slide bar 25. These slide bars 24, 25 are supported by guide members 29 in a state of being arranged parallel to each other so that they can move horizontally, and are connected by connecting members 22 so that they can move together.

In the transfer device 1 configured in this manner, when the cams 14, 16 rotate, the rotational motion is converted by the swing lever 18 into horizontal linear reciprocating motion and transmitted to the pair of slide bars 24, 25, which move together in the horizontal direction. As a result, the clampers 6, 10 that grip the workpiece W also move horizontally between the forging sections arranged side by side.

In the movement mechanism 13 of the transfer device 1, the roller device 30 of this embodiment is used in each of the portions including the roller 20 that contacts the cam 14 and the portion including the roller 20B that contacts the cam 16. The configuration of the roller device will be described in detail below using the roller device used in the portion including the roller 20 as an example. Figure 2 is a cross-sectional view of the roller device 30 used in the portion including the roller 20, and Figures 3 and 4 are a cross-sectional view and a perspective view showing the roller device 30 disassembled into its component parts.
As shown in FIG. 2, the roller device 30 includes the roller 20 which rotates in contact with the cam 14, a shaft body 32, a bracket 45, a pair of sleeve members 50, 51, and fixing force adjustment members 60, 61.

The bracket 45 is composed of plate-like members 45a and 45b arranged opposite each other, and a pair of mounting holes 46 and 47 are formed coaxially into which both ends of the shaft 32 are inserted. The two mounting holes 46 and 47 have different diameters, with the mounting hole 46 on the left side of the figure having a larger diameter and the mounting hole 47 on the right side of the figure having a smaller diameter.

The shaft body 32 is a rod-shaped member that supports the roller 20 by inserting it into the shaft hole 21 that penetrates the inner diameter portion of the roller 20 in the axial direction. At both ends of the shaft body 32, tapered portions 33, 34 are formed that are rotationally symmetrical about a reference axis O that is defined as a common central axis, and more specifically, the tapered portions 33, 34 are formed so that the radial dimension becomes smaller toward the tip end in the axial direction. The tapered portions 33, 34 have different diameters (outer diameters) at the base end (roller mounting portion 38 side), and the first tapered portion 33 on the left side in the figure has a larger diameter at the base end, and the second tapered portion 34 on the right side in the figure has a smaller diameter at the base end. A through hole 35 is formed inside the shaft body 32 and penetrates in the axial direction. Female thread portions 36, 36 extending in the axial direction are formed at both ends of the shaft body 32.
Small diameter pin holes 37, 37 are formed in the end face of the first tapered portion 33. The pin holes 37, 37 are used for positioning when the shaft body 32 inserted into the mounting holes 46, 47 of the bracket 45 is fixed.

A cylindrical roller mounting portion 38 is formed in the axial center of the shaft body 32. As shown in FIG. 2, the roller 20 is supported in a state where it is fitted onto the outside of the roller mounting portion 38. The roller mounting portion 38 is formed so that its central axis O1 is eccentric to the upper side in the figure with respect to the reference axis O. In this example, the amount of eccentricity δ can be exemplified as 1 mm.

Figure 5 is a schematic diagram showing the position of the roller outer surface 20a relative to the reference axis O in the V-V cross section of Figure 2. In this figure, the position of the roller outer surface 20a when the roller mounting portion 38 is offset upward in the figure by an eccentricity amount δ relative to the reference axis O is shown by a solid line, and the position of the roller outer surface 20a when the shaft body 32 is rotated 180° around the reference axis O from this state is shown by a two-dot chain line. By rotating the shaft body 32 around the reference axis O in this way, the distance from the reference axis O to the roller outer surface 20a can be adjusted within a range of 2δ.

When the diameter of the roller mounting portion 38 of this shaft 32 is compared with the diameter of the base end of the second tapered portion 34, the diameter of the roller mounting portion 38 is large and the diameter of the base end of the second tapered portion 34 is small, and as shown in Figure 4, a step surface 39 facing the second tapered portion 34 is formed around the entire circumference at the boundary between the second tapered portion 34 and the roller mounting portion 38.
Furthermore, when comparing the diameter of roller mounting portion 38 with the diameter of the base end of first tapered portion 33, the diameter of the base end of first tapered portion 33 is large and the diameter of roller mounting portion 38 is small, and a step surface 40 facing the roller mounting portion 38 is formed around almost the entire circumference at the boundary between first tapered portion 33 and roller mounting portion 38 except for the upper part in the figure.

The sleeve members 50, 51 are cylindrical members having a wedge-shaped cross section, more specifically, a substantially right-angled triangular cross section. When disposed between the end of the shaft 32 and the inner peripheral surfaces of the mounting holes 46, 47 of the bracket 45, the sleeve members 50, 51 have an outer peripheral surface 53 that faces the inner peripheral surfaces of the mounting holes 46, 47, an inclined inner peripheral surface 54 that faces the outer peripheral surfaces of the tapered portions 33, 34, and an end face 55 that is perpendicular to the axial direction of the shaft 32.
4, the sleeve members 50, 51 are formed with slits 27 at four circumferential locations from the tip end, where the plate thickness is thin in cross section, to the base end, where the plate thickness is thick. More specifically, one long slit 27a is formed penetrating from the tip end to the base end, and three short slits 27b are formed that do not reach the base end. These slits 27a and 27b make the tip side of the sleeve members 50, 51 easily bend in the radial direction.

The fixing force adjustment members 60 and 61 are bolt-shaped members that have a male threaded portion 63 and a flange portion 64 provided on one end side of the male threaded portion 63. However, the diameter of the flange portion 64 is different between the fixing force adjustment members 60 and 61. As shown in FIG. 2, the fixing force adjustment member 60 that is accommodated in the large diameter mounting hole 46 has a large diameter flange portion 64, and the fixing force adjustment member 61 that is accommodated in the small diameter mounting hole 47 has a small diameter flange portion 64.

2, the fixing force adjustment members 60, 61 are configured so that, when screwed into the female threads 36, 36 of the shaft 32, their flange portions 64 come into contact with the end faces 55 on the base end side of the sleeve members 50, 51, and press the sleeve members 50, 51 in the axial direction as the screw is fed. That is, the flange portions 64 form the pressing portions of the present invention.
A hexagonal hole 66 is formed on the surface of the flange portion 64 opposite the female thread portion 36 and is used when screwing the fixing force adjustment members 60 and 61 .

As described above, in the roller device 30, a fixing means for fixing the shaft body 32 to the bracket 45 is configured, which includes the tapered portions 33, 34 formed on the end of the shaft body 32, the female threaded portions 36, 36 formed on the end of the shaft body 32, the sleeve members 50, 51 arranged between the end of the shaft body 32 and the inner surfaces of the mounting holes 46, 47, and the fixing force adjustment members 60, 61 which press the sleeve members 50, 51 in the axial direction while screwed into the female threaded portions 36, 36.
Equipped with

With this fixing means, it is possible to change the fixing force between the shaft body 32 and the bracket 45 by changing the amount of screwing of the fixing force adjustment members 60, 61 when the roller device 30 is assembled as shown in FIG. 2. When the amount of screwing of the fixing force adjustment members 60, 61 is small, the shaft body 32 is allowed to rotate relative to the bracket 45. When the fixing force adjustment members 60, 61 are screwed further toward the center of the shaft body 32 from that state, the sleeve members 50, 51 are firmly pressed between the inner circumferential surfaces of the mounting holes 46, 47 and the ends of the shaft body 32, and the shaft body 32 is fixed so that it cannot rotate.

According to the roller device 30 of this embodiment configured as described above, the distance from the mounting holes 46, 47 of the bracket 45 to the roller outer surface 20a that abuts against the cam surface is determined by the amount of eccentricity of the shaft 32 and the outer diameter of the roller 20. Therefore, even if the cam surface 14a of the cam 14 is scraped off due to wear or correction for smoothing, as shown by the two-dot chain line in FIG. 6, for example, the position of the roller outer surface 20a that abuts against the cam surface 14a can be easily adjusted from the position shown by the solid line to the position shown by the two-dot chain line by rotating the shaft 32 relatively and changing the amount of eccentricity in the cam surface direction.

After the position of the roller outer surface 20a has been adjusted, the fixing force adjustment members 60, 61 can be screwed toward the center of the shaft body 32 to fix the shaft body 32 to the bracket 45 so that it cannot rotate.

In the roller device 30 of this embodiment, female threaded portions 36, 36 are formed at positions that overlap the tapered portions 33, 34 at the end of the shaft body 32 in a direction perpendicular to the axis, and male threaded portions 63, 63 that screw into the female threaded portions 36, 36 are formed on the fixing force adjustment members 60, 61. This reduces the axial dimension of the roller device 30 and makes it possible to house the fixing means within the bracket 45, preventing interference with surrounding objects.

The roller device and motion conversion mechanism of the present invention have been described in detail above, but the present invention is not limited to the above embodiment. For example, the fixing means in the roller device can be provided with a male thread on the shaft side, and the fixing force adjustment member can be configured with a nut. Furthermore, the motion conversion mechanism configured using the roller device of the present invention can be applied to motion conversion mechanisms other than the movement mechanism of a transfer device, and the present invention can be implemented in various modified forms within the scope of its purpose.

13. Movement mechanism (motion conversion mechanism)
Reference Signs List 14, 16 Cam 18 Swing lever 20, 20B Roller 30 Roller device 32 Shaft body 33, 34 Tapered portion 36 Female thread portion 38 Roller mounting portion 45 Bracket 46, 47 Mounting hole 50, 51 Sleeve member 60, 61 Fixing force adjustment member 63 Male thread portion 64 Flange portion (pressing portion)
O Reference axis

Claims (3)

A roller that rotates in contact with a cam as a mating member;
a shaft body supporting the roller, the shaft body having a roller attachment portion formed at the center in the axial direction, the roller attachment portion being offset from a reference axis defined as a common central axis at both ends;
a bracket having mounting holes into which both ends of the shaft are inserted;
a fixing means for fixing an end of the shaft body to a mounting hole of the bracket;
Equipped with
a distance from the mounting hole to an outer surface of the roller in a predetermined direction can be adjusted based on a relative rotation of the shaft body with respect to the bracket ,
The fixing means is
A tapered portion formed at an end of the shaft body;
a threaded portion formed on an end of the shaft and extending in an axial direction;
a sleeve member having a wedge-shaped cross section disposed between an end of the shaft body and an inner peripheral surface of the mounting hole;
a fixing force adjustment member that presses the sleeve member in the axial direction while being screwed into the threaded portion;
The roller device comprises : The threaded portion formed on the end of the shaft body is a female threaded portion, and the female threaded portion is formed at a position overlapping with the tapered portion in a direction perpendicular to the axis,
2. The roller device according to claim 1 , wherein the fixing force adjustment member is formed with a male thread portion that screws into the female thread portion. A motion conversion mechanism that converts a rotational motion of the drive shaft into a linear motion, the motion conversion mechanism comprising a cam that rotates around a drive shaft and a roller portion that contacts a cam surface of the cam,
A motion conversion mechanism, wherein the roller portion is constructed using the roller device according to claim 1 or 2 .

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