JPH0826433A - Roller device for roller conveyor - Google Patents

Abstract

PURPOSE:To ensure concentricity of a first roller and a second roller easily and correct an attitude of an object which is being conveyed easily in a roller device for roller conveyor which externally fits a pair of the first and second rollers in a drive shaft whose both ends are rotatably supported at a certain interval in a condition of the frictional transmission. CONSTITUTION:Annular projections 4 are provided and integrated in the vicinity of one end of a drive shaft 1, and a first roller 2a is arranged in the inside thereof. A second roller 2b is arranged in the vicinity of the other end. A transmission tube 3 fitted externally in the drive shaft 1 with an allowance is provided between these rollers. Both ends of it are brought into contact with each roller in such a manner that they can turn relatively. The first and second rollers 2a, 2b and the transmission tube 3 are pressurized in the axial direction by a compression spring 5 provided on the outside of the second roller 2b. An annular slide plate 60 for frictional transmission is interposed between opposing surfaces in the axial direction of each section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller device used in a roller conveyor in which a large number of roller devices are arranged side by side, and in particular, friction is transmitted between a roller and a drive shaft to forcibly stop an object to be conveyed. In this case, the present invention relates to a roller device which is configured to slip when a torque greater than a certain value is applied between the roller and the drive shaft included in the roller device.

[0002]

2. Description of the Related Art In a roller conveyor, a large number of roller devices of the above type are arranged in parallel between a pair of guide frames. As shown in FIG. 1, each roller device is rotatably supported between the pair of guide frames (F) (F), and a sprocket provided at one end of its drive shaft (1).
(7) and the drive chain (C) are engaged.

As a result, the respective roller devices are rotationally driven in the same direction, and the objects to be conveyed placed on these roller devices are conveyed. As shown in the figure, the roller device includes a drive shaft rotatably supported between guide frames (F) (F).
In (1), the roller is externally fitted in the friction transmission state.
This roller has the first and second rollers (2a) at both ends of the connecting tube (2c).
(2b) is fixed by welding.

Then, the first and second rollers (2a) (2b)
The bushes (B) and (B) for friction transmission are interposed between (1) and the first roller (2a) on _{one side} through the flange portion (B ₁ ) of the bush (B). It is in contact with the inner surface of the annular portion (71) protruding from the inner surface of (7). A compression spring is placed between the other second roller (2b) and the support portion of the drive shaft (1).
(5) is interposed, and the inner end portion of the (5) is in contact with the flange portion (B ₁ ) of the bush (B) via the contact plate (H). As a result, the flange portion (B ₁ ) is brought into pressure contact with the outer surface of the second roller (2b), and the entire roller having the above configuration is constantly pressed toward the annular portion (71).

In this structure, the driving force from the chain (C) is the frictional transmission between the first and second rollers (2a) (2b) and the driving shaft (1) via the bush (B), 1st and 2nd rollers (2a)
By friction transmission via the flanges (B ₁ ) and (B ₁ ) interposed between the end face of (2b) and the facing portion thereof, the first and second rollers (2
It is transmitted to a) (2b). Therefore, when the chain (C) is driven by engaging the sprocket (7) of each roller device arranged in parallel with one another (C) traveling in one direction, the object to be transported (M) is transported as described above. The first and second rollers (2a) (2b) and the drive shaft, such as when the transported object (M) stops
If a certain torque is generated between (1) and the bush (B) and flange (B ₁ ) and the drive shaft (1) or the first
-Slip occurs between the second rollers (2a) and (2b). Therefore,
It is possible to prevent the transferred objects (M) (M) from being damaged due to excessive pressing of the transferred objects (M) (M) lined up in the transfer direction. In addition, damage to the drive shaft (1) and the chain (C) due to excessive torque and load can be prevented.

However, in this structure, the first and second rollers (2a), (2b) and (2c) are integrated by welding, so that the first and second rollers (2a ) (2b) Mutual concentricity tends to be insufficient. In such a case, unreasonable force is likely to act on each part such as the first and second rollers (2a) (2b) and the drive shaft (1), resulting in wear of the parts and noise during use. easy. Also, the first and second rollers (2a) (2b)
Since the objects are stopped at the same time, there is a problem that it is difficult to correct the posture of the object to be transferred (M) when the object is conveyed in an inclined state.

[0007]

The present invention has been made in view of the above point, and it is "a drive shaft whose both ends are rotatably supported.
A roller device for a roller conveyor, in which a pair of first and second rollers (2a) and (2b) are externally fitted in a friction transmission state at a constant interval in (1) '', the first and second rollers (2a (2) It is an object to make it easy to ensure the concentricity of (2b) and to easily correct the posture of the transferred object (M) during transfer.

[0008]

[Technical Means] The technical means of the present invention taken in order to solve the above-mentioned problem is that an "annular protrusion near one end of a drive shaft (1)"
(4) are connected and integrated, the first roller (2a) is arranged inside the second roller, and the second roller (2b) is arranged near the other end, and the drive shaft (1) is arranged between these rollers. The transmission cylinder (3) fitted with a margin is interposed, and both ends of the transmission cylinder (3) are contacted so as to be rotatable relative to the rollers, and the second roller (2b)
The first and second rollers (2a) (2b) and the transmission cylinder (3) are axially pressed by a compression spring (5) provided on the outer side of the shaft, for friction transmission between the facing portions in the axial direction of the respective parts. Annular sliding plate (6
0) was intervened. ”

[0009]

The above technical means of the present invention operates as follows. In this case, since the compression spring (5) presses the first and second rollers (2a) (2b) and the transmission cylinder (3) toward the annular protrusion (4) side, the annular protrusion (4) ) And the first roller (2a),
Also, the first and second rollers (2a) (2b) and the transmission cylinder (3) are in a state of being pressed against each other in the axial direction, and an annular slide for friction transmission interposed between the facing portions of these parts in the axial direction. The plate (60) also frictionally transmits from the drive shaft (1) to the first and second rollers (2a) (2b). Since the first and second rollers (2a) and (2b) are pressed against the transmission cylinder (3), the first and second rollers (2)
a) (2b) rotates synchronously. As a result, the first and second rollers
(2a) The transferred object (M) placed on (2b) is transferred forward.

On the other hand, when the transported object is forcibly stopped, the rotation stopping force from the transported object acts on the first and second rollers (2a), (2b), and the friction transmission portion. Slippage occurs, and the first and second rollers (2a) (2b) are stopped while only the drive shaft (1) is rotating. In addition, the transported object
When the posture of the (M) is corrected during conveyance, the relative rotational force acts on the first roller (2a) and the second roller (2b), but the first roller (2a) Since the second roller (2b) is only connected to the second roller (2b) in the friction transmission state via the transmission cylinder (3), the relative rotation is possible.

Further, the first and second rollers (2a) (2b) and the transmission cylinder (3) are constructed separately from each other, and the drive shaft (1) is concentric to each other. First and second assembled in
Transmission cylinder (3) loosely fitted to the drive shaft (1) between the rollers (2a) and (2b)
The drive cylinder (3) has a slight radial allowance with respect to the drive shaft (1).
The first and second rollers (2a) and (2b) for (1) are not set in an eccentric state.

[0012]

[Effects] The present invention having the above-described structure has the following unique effects. The first and second rollers (2a) (2b) and the transmission cylinder (3) are not fixed to each other by welding or the like as in the conventional example, and distortion due to the welding does not occur. Is easily secured, and damages and noises of respective parts due to the eccentricity of the first and second rollers (2a) and (2b) with respect to the drive shaft (1) are prevented.

Since the first and second rollers (2a) and (2b) can rotate relative to each other, it is easy to correct the posture of the object to be conveyed (M) during the conveyance.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG. 2, a sprocket (7) that engages with the chain (C) is provided near one end of the drive shaft (1), and the first and second rollers (2a) ) (2b)
Both ends of the transmission cylinder (3) interposed between the first and second rollers (2a) and (2b) are partially fitted in the recessed portions of the inner surfaces.

[Regarding the Configuration of Each Part] Both ends of the drive shaft (1) are rotatably supported by bearings (R) and (R) mounted on a pair of guide frames (F) and (F) forming a roller conveyor. It is supported, and the sprocket (7) and the vicinity of one end of the drive shaft (1) are fixed by a key. The collar (8) is interposed between the sprocket (7) and the inner ring of the bearing (R) on the outside of the sprocket, and
A cylindrical portion is continuously provided on the inner surface of (7) to form an annular protrusion (4).

At the other end of the drive shaft (1), a male screw portion (12) is formed continuously inside the fitting portion with the bearing (R),
A washer (121) screwed with an adjusting nut (N) to the male screw part (12), is attached to the inside of the adjusting nut (N), and is paired with the drive shaft (1).
A compression spring (5) is interposed between the roller and the second roller (2b). The first and second rollers (2a) (2b) are made of metal, and a pair of metal bushes (B) (B) impregnated with lubricating oil are provided between each roller and the drive shaft (1). Bushing (B) that is tightly fitted with a specified fit tolerance and is located outside each roller
Is provided with a flange portion (B ₁ ) as an annular sliding plate (60). The fitting tolerance between the inner diameter of each bush (B) and the outer diameter of the drive shaft (1) and the fitting tolerance between the outer diameter of each bush (B) and the inner diameter of each roller are given by Value (eg 2/1
It is set to a clearance fit of about 00-5 / 100 mm).

Bush located outside the first roller (2a)
The flange portion (B ₁ ) of (B) is interposed between the annular projecting portion (4) and the outer surface of (2a), and the flange portion (B) of the bush (B) located outside the second roller (2b). ₁ ) is clamped between the contact plate (H) and the outer surface of (2b), which are in contact with the inner end of the compression spring (5). A circular recess (21) concentric with the drive shaft (1) is formed on the inner surfaces of the first and second rollers (2a) (2b), and both ends are loosely fitted into the recess (21). In this manner, the transmission cylinder (3) is interposed between the first and second rollers (2a) (2b).

The recessed portion (21) accommodates a short cylinder (6) having a flange portion (61) protruding outward. The flange portion (61) is an annular sliding plate (60), and the short cylinder (6) is the above-mentioned claim 2.
It becomes the cylindrical part (601) described in. Then, the flange portion (6
The fitting tolerance between the outer diameter of 1) and the inner peripheral diameter of the concave portion (21) is set to a predetermined value (for example, clearance fit of about 10/100 mm). Further, both ends of the transmission cylinder (3) are tightly fitted onto the short cylinder (6). Therefore, the transmission cylinder (3) is fitted to the first and second rollers (2a) and (2b) with the fitting tolerance between the flange portion (61) and the recessed portion (21), the short cylinder (6) and the transmission. An eccentricity equivalent to the sum of the fitting tolerance with the cylinder (3) is allowed. still,
A gap is formed between the short cylinder (6) and the drive shaft (1),
The structure is such that they do not contact.

The chain (C) for driving the sprocket (7) is supported by a belt-shaped chain guide (G) which is connected to the inside of the guide frame (F) and is long in the conveying direction. [Actual use] When the chain (C) is driven to run, it engages with the sprocket (7) and the drive shaft
(1) is driven to rotate.

The drive shaft (1) and the first and second rollers (2a) (2
b) and are frictionally transmitted by the bushes (B) and (B) interposed therebetween. In addition, the compression spring (5) is used for the first and second rollers.
Since (2a) (2b) and the transmission cylinder (3) are pressed toward the sprocket (7) side, the sprocket (7) and the first roller (2)
a), and the first and second rollers (2a) (2b) and the transmission cylinder (3) are pressure-welded to each other via the flange portion (B ₁ ) and the flange portion (61) as the annular sliding plate (60). In this state, friction is transmitted by this pressure contact portion. Further, both ends of the transmission cylinder (3) are frictionally transmitted to (2a) and (2b) by the fitting portion with the short cylinder (6).

Therefore, normally, the first and second rollers (2a) are
(2b) is rotated synchronously via the transmission cylinder (3). As a result, the transported object placed on the first and second rollers (2a) and (2b)
(M) (M) is transferred. On the other hand, the transferred object (M) being transferred
If (M) is forcibly stopped for some reason or temporarily stopped at the end of the conveyor, the first and second rollers
The transmission torque that acts between (2a) and (2b) and the drive shaft (1) exceeds the friction transmission torque, and the first and second rollers (2
Only drive shaft (1) continues to rotate with a) and (2b) stopped.

When the posture of the transported object (M) being transported is to be corrected, the transported object (M) is moved with respect to the first and second rollers (2a) (2b).
When a force to rotate the roller in the horizontal plane is applied, there is a difference in the amount of rotation between the first roller (2a) and the second roller (2b), but these rollers frictionally transmit through the transmission cylinder (3). Therefore, the rotation is performed according to the difference. In other words, the first and second rollers (2a), (2b) rotate in one direction as a whole in a state of relative rotation, and the posture of the transported object (M) can be easily corrected.

At this time, both ends of the transmission cylinder (3) are (2
Although it rotates relative to a) and (2b), both ends of the transmission cylinder (3)
Since the transmission cylinder (3) and the inner peripheral wall of the recess (21) do not come into direct contact with each other, the transmission cylinder (3) is not worn or damaged due to this contact. To be prevented. Further, since the transmission cylinder (3) does not contact the drive shaft (1), wear and the like due to this contact are prevented. Furthermore, the short cylinder (6) is the drive shaft.
Since the first and second rollers (2a) and (2b) slip against the drive shaft (1) because they do not contact (1), the drive shaft
The rotation of (1) is not transmitted to the roller, and the slip state is not hindered.

In this case, since the pressing force of the compression spring (5) is adjusted by adjusting the tightening degree of the adjusting nut (N), this adjustment allows the first and second rollers (2a ) Fine adjustment of the transmission torque can be performed when slippage occurs between (2b) and the drive shaft (1). [Modification] In the above embodiment, the first and second rollers (2a), (2b) are provided with the recesses (21), (21), but the recesses (21), (21) are not always necessary and are shown in FIG. So that the inner bush (B)
A short tube portion (B ₂ ) that is fitted onto the transmission tube (3) may be connected to the transmission tube (3).

[0025]. In this embodiment, each bush is made of a metal material impregnated with a lubricant, but any other material may be used as long as it can withstand the pressure contact force and has a low wear resistance.
For example, synthetic resin may be used. ． Flange part (B ₁ ) as the annular slide plate (60) (60) described above
Although the flange portion (61) is integrated with the bush (B) or the short tube (6), it goes without saying that they may be separated from each other.

.. The sprocket (7) and the annular protrusion (4) may be separate bodies.

[Brief description of drawings]

FIG. 1 is a sectional view of a roller device in a conventional example.

FIG. 2 is a sectional view of a roller device according to an embodiment of the present invention.

FIG. 3 is a sectional view of a modified example.

[Explanation of symbols]

 (1) ・ ・ ・ Drive shaft (2a) ・ ・ ・ First roller (2b) ・ ・ ・ Second roller (4) ・ ・ ・ Annular protrusion (3) ・ ・ ・ Transmission cylinder (5) ・ ・ ・ Compression Spring (60) ・ ・ ・ Annular sliding plate (601) ・ ・ ・ Cylindrical part (21) ・ ・ ・ Recessed part

Claims (3)

[Claims] 1. A drive shaft (1) having both ends pivotally supported.
In a roller device for a roller conveyor in which a pair of first and second rollers (2a) and (2b) are externally fitted in a frictional transmission state with a constant space, an annular protrusion is provided near one end of the drive shaft (1). (4) are connected in series and the first roller (2a) is arranged inside the second roller, and the second roller (2b) is arranged near the other end, and between these rollers,
The transmission cylinder (3) fitted on the drive shaft (1) with a margin is interposed, and both ends of the transmission cylinder (3) are contacted so as to be rotatable relative to each of the rollers, and the outer side of the second roller (2b). The first and second rollers (2a) (2b) and the transmission cylinder (3) are axially pressed by a compression spring (5) provided on the ring, and an annular ring for frictional transmission is provided between the facing portions of the respective parts in the axial direction. A roller device for a roller conveyor with a sliding plate (60) interposed. 2. A circular concave portion (21) concentric with the drive shaft is formed on the inner surface of the first and second rollers (2a) (2b), and the cylindrical portion is formed from the inner peripheral side.
An annular sliding plate (60) with a protruding (601) is closely fitted in the recess (21) so as to be relatively rotatable, and both ends of the transmission cylinder (3) are fitted in the cylinder (601). The roller device for a roller conveyor according to claim 1, wherein the roller device is tightly fitted so as to be relatively rotatable and is housed in the recessed portion (21) in a loosely fitted state. 3. The drive shaft (1) to the first and second rollers (2a) (2
The roller device for a roller conveyor according to claim 1 or 2, wherein the friction transmission member interposed in the transmission path to b) is constituted by a lubricating oil-impregnated sliding bearing material.