JP2001032853A - Torque limiter and conveyor device using the limiter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of a friction heat and friction noise, to facilitate regulation of friction torque, to suppress the occurrence of a secular change, and to provide an increased life, by constituting so as to press a planetary-form friction roller to a friction surface and transmit power by friction torque generated at a bearing part of the friction roller. SOLUTION: In a conveyor device, a torque limiter 1 situated in a drive force transmission route is interposed between a driven rotary body 2 and a drive rotary body 3. The torque limiter comprises a first member 5 having an annular friction surface 4; a second member 9 having a friction roller 7; and an energizing means 10 to press the friction surface 4 and the friction roller 7 against each other. The first member 5 is mounted on a protrusion shaft part 2C of a shaft body 2A supported by bearings 21 and 22 serving as the rotary body 2, and the friction surface 4 consists of the out surface of a step part situated at a base part 23. Meanwhile, the second member 9 has the friction roller 7 mounted on a main part 30 consisting of an annular body and a drive force is transmitted by a friction force exerted on the bearing of a friction roller 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque limiter capable of limiting a torque transmitted from a driving rotary body to a driven rotary body, and a conveyor device using the same.

[0002]

2. Description of the Related Art Conventionally, when a torque limiter for limiting torque is interposed between a driving rotator and a driven rotator, for example, when a machine bites into the driven side. Also, for example, to prevent the drive-side torque that can be generated by the prime mover from directly acting on the driven rotating body through the torque transmission path, or to prevent the torque transmission path generated by the driven rotating body from acting on the torque transmission path. For example, by preventing torque from being transmitted to the driving rotator, the torque between the driving rotator and the driven rotator can be limited to protect devices and workpieces from excessive torque. Have been done.

Further, in a conveyor device used in various types of mechanical devices, accumulation for temporarily storing the work on the conveyor device during transportation, or temporarily stopping the work for work on the work. In such a case, it is often necessary to start and stop the conveyor device itself, which often involves a risk of damage to the device. In addition, stopping the work due to slip between the work surface and the transfer surface involves a risk of damage to the work and the like, and power loss occurs. Although electric, pneumatic, and mechanical clutches are also used to cut off the force transmitted to the transfer surface, for example, in the case of a roller conveyor, a large number of rollers are provided with a clutch and controlled. The device is complicated and expensive because it is necessary.

For this reason, when the work is stopped, a torque limiter for limiting the transmission torque to be smaller than the slip resistance between the work and the transfer surface is provided between the driving rotary body and the driven rotary body. There is known a so-called friction conveyor in which a roller, a belt or the like, which is a conveying surface, is automatically stopped when a work is stopped by interposing the work.

[0005] As a torque limiter used for such a conveyor, those using a friction torque pressed against a friction disk and those using an attraction torque by a magnetic force are known.

[0006]

However, those using the above-mentioned friction disk usually have a large friction area, it is difficult to adjust the torque, and the frictional heat and the friction when sliding on the friction surface are reduced. Friction noise tends to be generated, and in the case of using a magnetic force, the transmission torque varies depending on the amount of the gap between the magnets, and adjustment may be difficult.

The present invention is based on the fact that a planetary friction roller is pressed against a friction surface and the friction torque generated in a bearing portion of the friction roller is used. The friction heat and friction noise are reduced, and the friction torque can be easily adjusted. It is an object of the present invention to provide a torque limiter that can suppress aging and can extend the life.

It is another object of the present invention to provide a conveyor device having a simple structure and easy handling by using the torque limiter.

[0009]

According to a first aspect of the present invention, there is provided a driven rotating body which is disposed so as to be aligned with an axis,
And a torque limiter interposed between the driving rotary body and the driving rotary body to limit the driving torque of the driving rotary body, the ring-shaped friction surface being held by one of the rotary bodies and surrounding the axis. A first member having at least one friction roller held by the other rotating body and rotating about a center line extending radially from the axis so that an outer peripheral surface can slide on the friction surface; The torque limiter includes a member and a biasing unit that presses the friction surface of the first member and the friction roller of the second member against each other.

Such a torque limiter limits the driving torque from the driving rotary body to the driven rotary body by limiting the torque to a friction torque based on the frictional force acting on the bearing of the friction roller pressed against the friction surface. In addition to the transmission, when an overload acts, the friction roller revolves around the friction surface while rotating in a planetary manner, and the driving force can be separated from the load side.

Therefore, the transmission and separation of the driving force is due to the frictional action accompanying the rotation of the friction roller, and the frictional heat and friction noise are reduced and the frictional noise is reduced as compared with the frictional surface using a friction plate. The torque can be easily adjusted and aging can be suppressed, the life can be extended, and the overload detection can be made sensitive, and even when the absolute value of the driving force is small (small or minute torque). An overload can be easily detected.

Further, the driven rotating body may be a shaft for holding a first member, and the second member may be held on the shaft together with the driving rotating body via a bearing via a bearing. The first member is fixed to an end of the cylindrical body, and is rotatably supported by a stationary shaft passing through the axis, and the second member is supported by the stationary shaft via a bearing. Alternatively, the friction roller may be a cylindrical body, a truncated conical body, or a plurality of narrow annular bodies divided in the axial direction.

According to a fifth aspect of the present invention, the driving-side rotating body is positioned between the parallel frames and on one frame side to dispose the torque limiter, and the driven rotating body extends to the other frame. Roller.

Since the torque limiter described above is used, the temporary storage function of the work in the roller conveyor, that is, the accumulation, can be easily performed by stopping the work by providing a stopper at the downstream end of the conveyor device, for example. Can be done. In addition, the pressing force of the conveyed objects during accumulation can be made smaller than the weight of the conveyed objects without the need for other auxiliary mechanisms, reducing the idling driving force during accumulation and switching between conveyance and accumulation by using a bearing. Because of the frictional action at the time of rolling, there is an advantage of the torque limiter, such as a longer wear life of the frictional contact body as compared with the one utilizing the sliding surface friction.

[0015] The friction surface of the torque limiter may be formed at an end of a conveying roller of a conveyor.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 3, a torque limiter 1
Is disposed between the driven rotating body 2 and the driving rotating body 3 arranged with the axis X aligned, and has a ring-shaped friction surface 4.
And a second member 9 having a friction roller 7, and a biasing means 10 for pressing the friction surface 4 and the friction roller 7 against each other.

In the present embodiment, the driven rotary body 2 is a shaft 2A pivotally supported by bearings 21 and 22 such as pillow blocks on both sides. For example, a chain wheel 2B is keyed to the rotary shaft 2A. The shaft body 2A includes a protruding shaft portion 2C that protrudes outward from one end of the bearing 22.

In this embodiment, the first member 5 is attached to the projecting shaft 2C. The first member 5 is provided with a boss 24 on one surface of a disc-shaped base 23, which is in contact with the inner ring of the bearing 22. A relatively long insertion tube portion 25 provided with a portion 25A is formed.

Further, on the outward surface of the base portion 23, there is provided a step portion 23A which protrudes outward with a small width from the outer peripheral edge.
The friction surface 4 is formed by an outwardly facing surface of the ring-shaped stepped portion 23A which is concentric with and surrounds. The friction surface 4
Can be formed integrally with the first member 5 or can be replaced by a friction member (not shown) made of a wear-resistant material for forming a friction surface, or can be fixedly attached by a screw or the like.

In this embodiment, the friction surface 4 is formed as a plane whose angle α with the axis X is a right angle. However, as described later, the friction surface 4 may be a cone surface whose angle α is a non-right angle. . The first member 5 is keyed to the shaft 2A and is prevented from falling off by a holding plate 26 fixed to the shaft end by bolts.

In the present embodiment, the second member 9 has the friction roller 7 attached to a main portion 30 formed of an annular body. The main portion 30 has a circumferential groove 31 extending circumferentially on a front surface 30A facing the friction surface 4, and a protruding portion 30C protruding inward at an inner edge of the inner circumferential surface 30B. And the outer surface 3
0D is a vertical plane. In addition, the inner peripheral surface 30B and the outer peripheral surface 30E are circumferential surfaces concentric with the axis X, and the outer surface 30D is provided with a screw hole 32 in the axial direction.

In the present embodiment, the driving rotating body 3 is a flat chain wheel 3A, and uses a bolt that fits into the outer peripheral surface 30E of the main portion 30 and is screwed into the screw hole 32 in the outer surface 30D. And is fixed concentrically with the axis X. Chain wheel 3A
In addition, a rotating body used for a V belt, a timing belt, a round belt, or the like can be used.

Further, the main portion 30 has three through-holes penetrating from the outer peripheral surface 30E to the inner peripheral surface 30B and passing through radial lines perpendicular to the axis X and radially spaced at equal intervals in the circumferential direction. Is formed. As shown in FIG. 2, the three friction rollers 7 are rotatably supported by being inserted into the circumferential grooves 31 by bearing pins 34 fixed to the through holes by press-fitting or the like. The bearing pin 34 is loosely fitted in the through hole,
It can also be properly stopped by a known means such as a set screw.

This friction roller 7 has a tapered or arcuate curved bulge 7B formed at one end surface of a base cylinder 7A made of a straight cylinder having the same diameter in the upper and lower directions, and is pivotally supported by the bearing pin 34. Accordingly, the center line Z becomes the direction of the radial line, and therefore, the outer peripheral surface can slide on the friction surface 4. Note that the friction roller 7 is set at 1
The above number can be selected.

The friction roller 7 and the friction surface 4 are made of different materials having a coefficient of friction of about 0.1 to 0.3, preventing mutual sliding movement, and having good wear resistance. It is preferable to use hardened steel such as hardened steel. In addition, in the case of light load, rubber,
Synthetic resins can also be used.

The main portion 30 of the second member 9 is inserted into the inner peripheral surface 30B via a bearing 36 which is, for example, a ball bearing, which is inserted into the projection 30C with its inner end surface abutting. The main portion 30 and the rotating body 3 for driving are axially moved to the outer peripheral surface of the cylindrical portion 25 so as to be movable in the axial direction.
Be concentric with.

In the present embodiment, the biasing means 10 is formed of a coil spring, and is screwed and fixed to the collar member 37 disposed on the outer surface of the inner ring of the bearing 36 and the screw portion 25A of the fitting / inserting tube portion 25. The collar member 3 is arranged between the collar member 3 and the spring adjustment nut 38 by a force corresponding to the compression force.
7. The friction roller 7 of the second member 9 can be pressed against the friction surface 4 via the inner ring and the outer ring of the bearing 36 that can move in the axial direction.

In the torque limiter 1 of the present invention,
As shown in FIG. 4, a friction roller 7A with a pin is used as an integral support shaft 34A by replacing the friction roller 7 with the bearing pin 34.
It can also be formed as In this example, the inner side in the radial direction is a flat bearing 39A, and the outer side is a rolling bearing 39B.
It is possible to incorporate the friction roller 7 from outside. By using at least one of the flat bearings 39A, a certain coefficient of friction is maintained in the bearing portion.

As shown in FIG. 4, the main portion 30 is rotatably fitted to the insertion tube portion 25 using, for example, two bearings 36, 36.
It can also be supported. Furthermore, instead of the continuous circumferential groove 31, a projecting portion (not shown) projecting inward only at the position of the friction roller 7 is formed as an intermittent groove (not shown) formed in the main portion 30. Can also.

Further, as shown in FIGS. 5, 6, and 7, the friction roller 7 can be formed in a truncated cone shape. then,
The ratio of the maximum diameter D7a of the friction roller 7 to the minimum diameter D7b (D
7a / D7b) is set to the ratio (D4a / D4b) between the maximum contact diameter D4a and the minimum contact diameter D4b of the friction surface 4 so that the peripheral speeds are matched in the radial direction to reduce slip on the contact surface.

At this time, in the example shown in FIG. 5, the angle α of the friction surface 4 is a right angle, and the center line Z of the friction roller 7 is inclined at a half of the ratio (D7a / D7b). In FIG. 6, the center line Z of the friction roller 7 is set to the direction of the radial line, and the angle α of the friction surface 4 is set to a ratio (D7a
/ D7b). Further, in FIG. 7, both the friction surface 4 and the center line Z are inclined.

As shown in FIG. 8, the influence of the peripheral speed change due to the difference in radius is reduced by dividing the friction roller 7 into a plurality of divided friction rollers 7B in the axial direction.
As shown in FIG. 4, the friction surface 4 has a triangular cross-section and a small outer end width to reduce a change in peripheral speed due to a difference in radius. Such a configuration can be selected and adopted also in the friction roller 7 as long as the contact surface pressure is allowable.

As the urging means 10, a disc spring 10B can be used as shown in FIG. 7, and the urging force can be directly applied to the main part 30 by increasing the spring diameter as shown in FIG. Can also. In addition, an air actuator, an electromagnetic actuator, or a combination thereof with a spring or the like can be used as the urging means (note that an air actuator, an electromagnetic actuator, or a combination of these and a spring is used as the urging means) As shown in FIGS. 14 and 15, a stationary shaft 5 having a torque limiter 1 provided on a frame 41 is provided.
When disposing them at 0, they can be easily attached using these frames 41).

Further, as shown in FIGS. 10 and 11, the friction surface 4 can be formed into a corrugated uneven shape. The unevenness is an integral multiple of the number of the friction rollers 7.
At the same time is located in the concave portion 4a or the convex portion 4b. Convex part 4
When the friction roller 7 rides on the roller b, the urging means 10 is pressed and contracted to increase the pressing force, thereby increasing the transmission torque. In addition, as a wavy shape, in addition to a continuous curve of an uneven arc, a sine curve,
It can be variously deformed such as triangular.

Further, in the torque limiter 1, the first member 5 is used as the driving rotator 3 and the second member 5 is used as the driven rotator 2.
The member 9 can be disposed, and the first member 5 can be axially movable and can be pressed by the urging means 10, and the driven rotating body 2 and the driving rotator 3 are moved by the urging means 10. Can be held so as to be slightly movable in the axial direction with the first member 5 and the second member 9.

Such a torque limiter 1 can be used, for example, in a conveyor device 40 as shown in FIGS. In this example, the conveyor device 40 is a roller conveyor, and a pair of parallel frames 41, 41
.. Has a frame 43 joined by a connecting member which is connected to the frame 43, and a caster 44 is provided on the frame 43 so that the frame 43 can be moved and relocated freely.

In the present embodiment, the frame 41 is formed of a channel-shaped member provided with upper and lower flanges projecting outwardly above and below a vertical web 45. In this embodiment, the torque limiter 1 is provided between the frames 41, 41 at one end. Rollers 47
, And free rollers 49 that can freely rotate are bridged every other. The transport rollers 47
The arrangement and pitch of the free rollers 49 can be freely selected according to the size of the work w.

In this example, as shown in FIG. 14, the torque limiter 1 is disposed on a stationary shaft 50 which is stopped and suspended between the frames 41, 41 on both sides, and furthermore, the frames 41, 41 Between and one frame 41
It is interposed between the chain wheel 3A, which is the driving rotating body 3 located on the side, and the roller body of the transport roller 47, that is, the cylindrical body 51, which is the driven rotating body 3.

A chain wheel 3A, which is the rotating body 3 for driving.
Is the main part 3 of the second member 9 having the friction roller 7
The cylindrical body 51, which is formed integrally with the cylindrical member 0 and is the driven rotating body 3, is fixed to the first member 5 having the friction surface 4 through a cylindrical joint 53 so as to be concentric with the axis X. The other end of the cylindrical body 51 is pivotally supported by the stationary shaft 50 via a bearing (not shown).

Further, in this torque limiter 1, a fitting insertion cylinder 5 which is externally fixed to the outer peripheral surface of the stationary shaft 50.
5, and the first member 5 is provided with the cylindrical joint 53
Is an annular body fitted and fixed to the inner peripheral surface of the body and having the outer surface as the friction surface 4, and is supported by the fitted insertion tube body 55 via a bearing 56.

Further, the second member 9 is also held movably in the axial direction by the fitting / inserting cylinder 55 via the bearing 36 in the same manner as in the above-mentioned embodiment, and the spring adjusting nut 38 screwed to the fitting / inserting cylinder 55. And the friction roller 7 is pressed against the friction surface 4 as described above.

As described above, the first member 7, the second member 9, and the urging means 10 are assembled by using the bearings 36, 56 and the like on the fitting / inserting cylinder 55 to constitute the integral torque limiter 1. I have.

Further, a chain wheel 59 for folding the chain is provided at one end of the frame 41, and an electric motor M is provided at the other end.
A chain wheel 60 attached to the output shaft of
The driving rotator 3 fixed to the second member 9, that is, the chain wheel 3 </ b> A meshes with the upper traveling line 61 </ b> A of the chain 61 circulating around the shaft 61. As shown in FIG. 14, a guide member 62 for receiving the upper traveling line 61A of the chain 61 is disposed to prevent disengagement, and a groove-shaped receiving member 64 for inserting the returning lower traveling line 61B is disposed below. are doing.

In this embodiment, as shown in FIG. 14, a cover cylinder 65 is provided on the outer peripheral surface 30E of the main portion 30 of the second member 9 to reduce the gap between the second member 9 and the cylindrical joint 53. A cover 66 for hiding the chain wheel 3A and the like can be attached to the frame 41 on the conveyor device 40. The cover cylinder 65 is provided on the outer peripheral surface 3 of the main portion 30 of the second member 9.
The engagement with 0E prevents the bearing pin 34 from coming off in the radial direction. In addition, the bearing 36 prevents the inward movement.

Further, in the torque limiter 1 used in the conveyor device 40, the first member 5 can be fitted and fixed to a cylindrical body 51 as shown in FIG. 15 without the cylindrical joint 53.

In a state where the mechanical action of the torque limiter 1 is incorporated in the conveyor device 40, FIG.
This will be described with reference to FIG. Reference numerals used in the following description are as follows, and numerical values used for calculation are described in parentheses.

D: Outer diameter of the transfer roller 47 W: Vertical load acting on the transfer roller 47 Df: Pitch circle diameter around the axis X of the friction roller 7 (= 0.
8D) db: pitch circle diameter of the bearing 36 (= 0.5D) μr: friction coefficient of the bearing 36 (0.02) μf: friction coefficient of the bearing portion of the friction roller 7 (0.15) μk: transport roller 47 Coefficient of slip friction (0.3)

A) Regarding the driven rotary member 2 1) The tangential force Fr required on the outer peripheral surface of the transport roller 47 is expressed by the following equation (1). Fr = W · μr (1) 2) The load torque Mr required to rotate the transport roller 47 to which the load W acts is given by the following equation (2). Mr = (D / 2) · Fr = (D / 2) · μr · W (2) b) Regarding the friction roller 7 1) The effective torque Mf of the friction roller 7 is obtained by the following equation (3). Mf = (torque of friction roller 7) − (torque of bearing 36) = ((Df / 2) · μf · Ps) − ((db / 2) · μr · Ps) = (Ps / 2) (Df.mu.f-db..mu.r) (3) 2) The pressing force Ps required by the urging means 10 is obtained by the following equation (4). However, the load torque Mr is
It is assumed that the effective torque is equal to the effective torque Mf of the friction roller 7 (M
f = Mr). (Ps / 2) · (Df · μf−db · μr) = (D / 2) · μr · W Ps = (D · μr · W) / (Df · μf−db · μr) (4) c) Idling of the driving rotating body 3 1) Torque Mk at which the transport roller 47 slips with the work w Mk Mk = (D / 2) .mu.k.W (5) 2) Here, the driving rotating body To stop 3, it is necessary that Mf ≦ Mk (6). By substituting the equations (3) and (5), the following equation (7) is obtained. (Ps / 2) · (Df · μf−db · μr) ≦ (D / 2) · μk · W (7)

When the above numerical values are substituted into equation (4), Ps ≒ 0.18W (4a) Further, substituting equation (4a) and other hypothetical figures into equations (3) and (5), Mf = 0.01W · D (3a) Mk = 0.15W · D (5a) That is, (7) As in the equation, Mf (= 0.01 W · D) <Mk (= 0.15 W · D) (7a) is satisfied.

Assuming that the starting torque is about twice the effective torque Mf of the friction roller 7, Ps is doubled, that is, 2 ×
Assuming 0.18 W, 2 × 0.01 W · D = 0.
02W · D, which is smaller than 0.15, so that the friction roller 7 rotates and revolves around the friction surface 4 without causing a slip between the workpiece w and the transport roller 47, and moves around the friction surface 4. Will be done.

As described above, the torque limiter 1 includes the friction surface 4
The frictional force acting on the bearing of the friction roller 7 by pressing against the friction roller 7 transmits the driving force from the driving rotator 3 to the driven rotator 2 and, when an overload is applied, causes the friction. As the roller 7 revolves while rotating the friction surface 4 as described above, the driving force can be separated from the load side.

Therefore, the transmission of the driving force and the separation thereof are due to the frictional action associated with the rotation, so that the wear life can be extended as compared with the frictional contact with the surface, and the detection of the overload is made more sensitive. Even when the absolute value of the driving force is small (small or minute torque), the overload can be easily detected.

Further, since the above-described torque limiter 1 is used in the conveyor device, the accumulation in the roller conveyor can be performed by, for example, providing a stopper at the downstream end of the conveyor device to stop the work, thereby achieving the expression (6). By making it possible to satisfy Mf ≦ Mk,
By causing the friction roller 7 to revolve while rotating on the friction surface 4 as described above without causing the transfer roller and the work to slip, only a torque approximating the torque due to the bearing surface pressure of the friction roller 7 acts. To stop.

For the above-mentioned reason, the force with which the conveyed objects push each other during the accumulation is made as small as possible compared to the weight of the conveyed object without requiring any additional auxiliary mechanism, so that the accumulation-time idle driving force is reduced, and the conveyance and accumulation are reduced. Since the switching is based on the frictional action at the time of rolling, the wear life of the frictional contact body is prolonged as compared with the one using surface friction.

[0055]

As described above, according to the first aspect of the present invention, the first member having a ring-shaped friction surface fixed to one of the rotating bodies and surrounding the axis and the other rotating body. A second member having at least one friction roller that is fixed and has an outer peripheral surface that can slide on the friction surface, and the friction surface and the friction roller are pressed against each other by urging means;
The frictional force acting on the bearing of the friction roller due to the pressing of the friction surface and the friction roller transmits the driving force from the driving rotating body to the driven rotating body, and when an overload is applied, the friction roller The driving force can be separated from the load side by revolving while rotating the friction surface as described above.

Therefore, the transmission of the driving force and the separation thereof are due to the frictional action accompanying the rotation, and the wear life is increased and the overload is increased as compared with a conventional sliding surface using a friction plate in frictional contact. In addition to making the detection sensitive, the overload can be easily detected even when the absolute value of the driving force is small (small or minute torque).

Further, the generation of frictional heat and friction noise can be reduced, and the friction coefficient can be stably calculated by selecting the material of the friction roller, so that the pressing force and the idling force can be easily calculated. By reducing the change in friction coefficient and wear amount over time, the change in transmission torque can be reduced, and the torque can be easily adjusted by the urging means.

According to the second aspect of the present invention, the driven rotating body is formed of a shaft, and the first member and the second member are linked to the shaft. In addition, torque accuracy can be improved.

According to the third aspect of the present invention, the first member is fixed to the driven rotary member supported by the stationary shaft, and the second member is supported on the stationary shaft integrally with the driving rotary member. , And the driven rotating body is a cylindrical body, so that this cylindrical body can be used as a transport roller of a roller conveyor.

According to the fourth aspect of the present invention, the friction roller is constituted by a cylindrical body, a truncated conical body, or a plurality of narrow annular bodies divided in the axial direction. Slip can be reduced by making the peripheral speed on the outer peripheral surface of the roller the same regardless of the radial position.

According to the fifth aspect of the present invention, the driving-side rotating body is positioned between the parallel frames and on one side of the frame, and the torque limiter is arranged. The other rotating body is mounted on the other frame. As compared with the conventional roller using a friction plate that makes use of sliding friction by making the roller body and the drive side face-to-face contact with each other by being an extending roller, the same effect as described in claim 1 is obtained. In addition, it has a stable transport force and accumulation function, and can reduce the power at the time of accumulation.
The configuration is simple and handling is easy.

According to the sixth aspect of the present invention, since the friction surface of the torque limiter is formed at the end of the roller of the conveyor, the structure can be further simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention.

FIG. 2 is a front view illustrating a second member.

FIG. 3 is an exploded perspective view.

FIG. 4 is a cross-sectional view illustrating another embodiment.

FIG. 5 is a cross-sectional view illustrating still another embodiment.

FIG. 6 is a cross-sectional view illustrating another embodiment.

FIG. 7 is a cross-sectional view illustrating another embodiment.

FIG. 8 is a cross-sectional view illustrating another embodiment.

FIG. 9 is a front view showing another example of the first member.

FIG. 10 is a plan view thereof.

FIG. 11 is a cross-sectional view illustrating another embodiment.

FIG. 12 is a plan view illustrating one embodiment of a conveyor device.

FIG. 13 is a front view thereof.

FIG. 14 is an enlarged cross-sectional view illustrating a portion of a torque limiter of the conveyor device;

FIG. 15 is a cross-sectional view illustrating another torque limiter.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 torque limiter 2 driven rotating body 2A shaft body 3 driving rotating body 3A chain wheel 4 friction surface 5 first member 7 friction roller 9 second member 10 biasing means 30 main part 40 conveyor device 41 frame 47 transport Roller 49 Free roller 50 Stationary shaft 51 Cylindrical body X Axis Z Center line

Claims (6)

[Claims] A driven rotary member disposed in alignment with an axis;
And a torque limiter interposed between the rotating body for driving and a driving torque limiter for limiting the driving torque of the rotating body for driving, the ring-shaped friction surface being held by one of the rotating bodies and surrounding the axis. A first member having at least one friction roller held by the other rotating body and rotating about a center line extending radially from the axis so that an outer peripheral surface can slide on the friction surface; A torque limiter comprising: a member; and biasing means for pressing the friction surface of the first member and the friction roller of the second member against each other. 2. The driven rotating body is a shaft holding the first member, and the second member is held by the shaft together with the driving rotating body via a bearing. The torque limiter according to claim 1, wherein: 3. The driven rotating body is a cylindrical body, and the first member is fixed to an end of the cylindrical body, and the first member is rotatably supported by a stationary shaft passing through the axis. And the second member is supported by the stationary shaft via a bearing together with a driving rotating body.
The torque limiter as described. 4. The torque limiter according to claim 1, wherein said friction roller comprises a cylindrical body, a truncated conical body, or a plurality of narrow annular bodies divided in an axial direction. . 5. The torque limiter according to claim 1, wherein a rotating body on the driving side is located between the parallel frames and on one frame side, and the rotating body to be driven is the other. A conveyor roller extending to the frame. 6. A conveyor device according to claim 5, wherein said friction limiter is formed at an end of a conveyor roller of said conveyor.