JPH0322168Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a driven roller conveyor.

(Prior Art) Driven roller conveyors typically include multiple rollers,
The main components include a shaft that rotatably supports each roller, a frame that supports each shaft, and a drive member that rotates each roller. Each shaft is supported by the frame so as to be slidable in its axial direction, and a roller and a driving member are respectively rotatably attached to these shafts via bearings. The roller and the driving member are in contact with each other via a friction plate. Further, the roller is pressed toward the driving member by the urging force of the urging member that is locked to the shaft within the roller. Therefore, the roller and the driving member are frictionally engaged with each other with a constant pressing force through the friction plate, and when the driving member is rotated, the roller is rotated in response to the rotation of the driving member.

In the above-mentioned drive roller conveyor, the load conveyed on the rollers may become unable to be conveyed for some reason. In such a case,
The friction plate between the roller and the driving member slides, and the rotation of the roller is stopped even when the driving member is rotating, so that the cargo is not damaged.

By the way, in order to effectively stop the rotation of the roller by sliding the friction plate when the above-mentioned situation occurs where transport is impossible, it is necessary to It is necessary to set the pressing force between the drive member and the drive member to a predetermined value.
Therefore, it is desirable that the biasing force of the biasing member can be adjusted as desired. Therefore, in order to meet this requirement, a screw mechanism is provided at one end of the shaft, and the urging force of the urging member can be adjusted by sliding the shaft in the axial direction by operating the screw mechanism. It has been proposed and put into practical use.

(Problems to be Solved by the Invention) In the drive roller conveyor described above, the shaft is supported by the frame in a slidable and rotatable manner. Therefore, when adjusting the biasing force of the biasing member, it is necessary to fix the other end of the shaft to prevent the shaft from rotating before operating the screw mechanism, which takes time and effort.

(Means for solving the problem) This invention includes a frame, a shaft supported at both ends by the frame, and a roller and a drive member rotatably attached to the shaft,
In order to rotate the roller in a driven state by rotating the drive member, the drive member and the roller are frictionally engaged by the biasing force of an elastic member whose one end is locked to the shaft. In the drive roller conveyor, the shaft is configured to be movable in its axial direction by a screw mechanism provided at one end of the shaft to adjust the biasing force of the elastic member. The other end of is supported in a non-rotatable manner.

(Function) According to the above configuration, the shaft is always in an unrotatable state, which saves the effort of fixing the other end of the shaft every time the screw mechanism is operated, and also prevents the roller from being driven even when the roller is rotating. The force can be adjusted arbitrarily.

(Example) Next, an example of this invention will be described based on the drawings.

In FIG. 1, which shows a chain-driven drive roller conveyor 1 in cross section, the shaft 3 is formed in a cylindrical shape. Although not shown in the figure, there are multiple shafts 3. A screw constituting a screw mechanism is formed at one end E1 of each shaft 3, and a nut 5, also constituting the screw mechanism, is screwed into this screw. Note that the nut 5 has a tapered surface 7 formed therein. The other end E2 of each shaft 3 is formed into a partially circular cross section as shown in FIG. 2 by cutting out a portion of its outer peripheral surface. Further, a hole 10 having a shape corresponding to the tapered surface 7 of the nut 5 is formed in the frame 9, and a hole 12 having a shape corresponding to the partially circular shape of the end portion E2 of the shaft 3 is formed in the frame 11. The end E1 of each shaft 3 is supported by the frame 9 by engagement with the tapered surface 7 of the nut 5 and the hole 10, while the end E2 of the shaft 3 is inserted into the hole 12. It is supported by a frame 11. Note that the end E2 of the shaft 3 and the hole 12
A gap is formed between them, and the end portion E2 is set so as to be able to slide with respect to the hole 12.
With the above configuration, by rotating the nut 5, the shaft 3 can be slid in its axial direction.

A cylindrical roller 13 and a sprocket 15 as a driving member are rotatably attached to each shaft 3 via a pair of bearings 17, 19 and 21, 23, respectively. In addition, the roller 13
A friction plate 25 is attached between the sprocket 15 and the sprocket 15, and a spacer 27 is attached between the sprocket 15 and the frame 9. Furthermore, a compression coil spring 29 as an elastic member is fitted onto the shaft 3. This compression coil spring 29 is disposed within the roller 13, and one end thereof is locked to the shaft 3 by a locking member 30.
The other end is brought into contact with a bearing 17, and the roller 13 is
It is biased in the direction. As a result, the roller 13 and the sprocket 15 are frictionally engaged with each other via the friction plate 25 with a constant pressing force.

Further, a chain 31 is engaged with each of the rockets 15 for rotating the same. This chain 31 is engaged with a drive sprocket (not shown) attached to a drive (not shown). Further, in order to ensure the engagement between the sprocket 15 and the chain 31, a guide roller 33 as a chain tightener is appropriately attached to the frame 9, and in order to smoothly return the chain 31, the frame 9 is provided with a guide roller 33 as a chain tightener. A guide sprocket 35 is appropriately attached to the lower end of the sprocket. Further, a cover member 37 for covering each sprocket 15 is attached to the frame 9.

Drive roller conveyor 1 configured as above
To explain the operation, when the chain 31 is operated by the drive device, each sprocket 15 engaged with this chain 31 is rotated, and each roller 13 is accordingly rotated in the same direction. As each roller 13 rotates, a load (not shown) placed on the roller 13 is conveyed in the direction of rotation.

If the load becomes unable to be conveyed during conveyance, the friction plate 25 slides between the roller 13 and the sprocket 15, and the rotation of the roller 13 is stopped.

Next, the operation of adjusting the pressing force between the roller 13 and the sprocket 15 will be explained. first,
To increase the pressing force, turn the nut 5 to move the shaft 3 in the direction P in the figure. Then, the compression coil spring 29 is compressed between the locking member 30 and the bearing 17, and the roller 13 is urged in the P direction with a stronger urging force. As a result, the pressing force between roller 13 and sprocket 15 is increased. Note that in order to reduce the pressing force, the opposite operation may be performed, so a description thereof will be omitted.

By the way, since the end E2 and the hole 12 of the shaft 3 are configured as described above, the shaft 3 does not rotate even if the nut 5 is rotated. Therefore, there is no need to fix the end E2 of the shaft 3 when adjusting the pressing force.

In this example, the end portion E2 and the hole 12 are formed into a partially circular shape, but any shape may be used as long as it can prevent the shaft 3 from rotating. Furthermore, the same effect can be obtained by providing a key at the end E2 and forming a key groove in the hole 12, and engaging the two.

Further, since the nut 5 screwed onto the end E1 of the shaft 3 is engaged with the hole 10 having a shape corresponding to the tapered surface 7 through its tapered surface 7 as described above, it has excellent tightening performance. ing. Therefore,
There is no need to provide a separate member to fix the nut 5 and prevent it from loosening. Also, with this configuration,
Since the shaft 3 is always held at the center of the hole 10, there is no need to accurately determine the diameter of the hole 10 in accordance with the outer diameter of the shaft 3.

(Effect of the invention) The present invention has a sprocket 1 attached to the shaft 3 which is fixed to the frames 9 and 11 so as to be movable in the axial direction.
5 and roller 13 respectively with ball bearings 1
7, 19, 21, and 23 so as to be rotatable and movable in the axial direction, and the sprocket 15 and roller 13 are pressed against the frame 9 on the sprocket 15 side to apply friction pressure between the sprocket 15 and the roller 13. To apply, sprocket 15
A drive roller with a nut 5 attached to the end of the shaft 3 protruding from the side frame 9, which presses the sprocket 15, the roller 13, and the sprocket 15 side frame 9 against each other against the urging force of the compression coil spring 29 so that the urging force can be adjusted. It's on the conveyor.

As a result, the present invention has the effect that even while the roller 13 is rotating, the frictional contact force between the sprocket 15 and the roller 13 can be adjusted to arbitrarily adjust the driving force of the roller 13.
When moving the shaft 3 in the axial direction by operating the nut 5 attached to one end, there is no need to fix one end of the shaft 3. Therefore, by moving the shaft 3 in the axial direction, the compression This has the advantage that the operation for adjusting the biasing force of the coil spring 29 can be performed quickly.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a sectional view of the drive roller conveyor, and FIG. 2 is a cross-sectional view of the drive roller conveyor.
FIG. 1... Drive roller conveyor, 3... Shaft,
5... Nut, 9, 1... Frame, 13... Roller, 15... Sprocket, 17, 19, 2
1, 23... Bearing, 29... Compression coil spring, E1, E2... End.

Claims (1)

[Scope of utility model registration request] A sprocket 15 and a roller 13 are connected to a shaft 3 which is fixed to the frames 9 and 11 so as to be movable in the axial direction, and are connected to ball bearings 17, 19 and 2, respectively.
1 and 23 so as to be rotatable and movable in the axial direction, and the sprocket 15 and the roller 13 are pressed against the sprocket 15 side frame 9 to apply a frictional contact force between the sprocket 15 and the roller 13. Sprocket 15 side frame 9
A drive characterized in that a nut 5 is attached to the end of the shaft 3 protruding from the shaft 3 for pressing the sprocket 15, the roller 13, and the frame 9 on the sprocket 15 side against each other against the biasing force of the compression coil spring 29 so that the biasing force can be adjusted. roller conveyor.