JPH04244649A - Drive transmission mechanism - Google Patents

Abstract

PURPOSE:To actualize such a drive transmission mechanism that has used a two-way rotatable magnet idler driving system. CONSTITUTION:Magnet idlers 5a, 5b are interposed so as to be opposed to each other as holding an output shaft 4 and a pulley 2 between and they are attracted to both of them. When the output shaft 4 is rotated to the left (full line), these magnet idlers 5a, 5b rotated to the right (full line) together. At this time, the pulley 2 rotated to the right (full line). The magnet idler 5b is merely dragged around and it works almost nothing of drive transmission. Next, when the output shaft 4 is rotated to the right (dotted line), the pulley 2 rotates right (dotted line). Therefore two-way rotatable drive is thus made performable.

Description

[Detailed description of the invention]

0001

TECHNICAL FIELD The present invention relates to a drive transmission mechanism, and more particularly to a drive transmission mechanism that utilizes frictional drive to transmit rotational force to a rotating shaft. For example, it is applied to printers, copying machines, facsimile machines, and the like.

0002

[Prior Art] Conventionally, rotation transmission means for transmitting the rotation of a driving shaft to a driven shaft include a belt drive in which a belt is wound around a pulley provided on each of the driving shaft and driven shaft, and a belt drive that winds a belt around a pulley provided on each of the driving shaft and driven shaft. There was a rim drive that pressed the idler between each wheel.

[0003] In the rotation transmission means using the belt drive or rim drive, friction loss occurs because the pulleys and wheels are subjected to side pressure due to the tension force of the belt and side pressure due to the pressing force of the idler, respectively. This requires extra rotational driving force from the driving source, resulting in a disadvantage that the rotating driving source becomes large. In order to solve this problem, for example, Japanese Patent Application Laid-open No. 153048/1983
A "magnetic rotation transmission device" has been proposed.

[0004] This publication includes an outer peripheral surface of a driving rotating shaft, an outer peripheral wall surface made of a magnetic material of a driven rotating body having a circular cross section and provided adjacent to the driving rotating shaft so as to be rotatable about a predetermined axis. In between, a magnet with a circular cross section is inserted between the outer circumferential surfaces of the main rotating shaft and the outer circumferential surface of the driven rotary body so as to keep attracting them during rotation, thereby transferring the rotation of the main rotating shaft to the driven rotating body. It is designed so that it can be transmitted. In other words, it is a device that transmits rotation using the attractive force of a magnet.

[0005] Also, the previously proposed patent application No. 1-9268
The "rotation transmission drive device" No. 0 is a device that performs abrasion treatment on the surface of the rotating body to improve suction power and reduce slip. In addition, the previously proposed patent application No. 2-1057
No. 81, "Image Output Device," relates to a solid-state scanning optical printer that employs a drive transmission mechanism using a magnetic idler.

[0006] The device disclosed in Japanese Patent Application Laid-Open No. 61-153048 suffers from uneven rotation, which is the biggest drawback of gears, belts, etc.
This reduces noise and enables smooth transmission of rotational driving force. However, it has not been put to practical use in devices such as office automation equipment because of its high slip rate.

Since the pressing force of the rotating body depends on the magnetic attraction force of the magnet, if the load or load fluctuation of the driven rotating body is large, slippage will occur, and the desired transmitted torque, rotational speed, and rotational speed will be reduced. Accuracy cannot be obtained. Therefore, a rubber coating is applied to the surface of the magnet to prevent it from slipping, but it is difficult to handle because the properties vary greatly depending on the hardness of the rubber.

In other words, lowering the rubber hardness increases the coefficient of friction and makes it difficult for slippage to occur, improving the transmission force and rotational unevenness, but the spring constant decreases, making it extremely vulnerable to load fluctuations. . Conversely, increasing the hardness of the rubber increases the spring constant, making it more resistant to load fluctuations, but the coefficient of friction decreases, making it more likely to slip, making the rubber coating meaningless. In addition, the contact surfaces between the rotating body (driver, driven) and the magnet are smooth surfaces or smooth surfaces and rubber, so
The coefficient of dynamic friction on the contact surface does not increase easily.

Therefore, in the above-mentioned Japanese Patent Application No. 2-105781, the surface of the rotating body is roughened in order to increase the coefficient of dynamic friction of the contact surface, which reduces slippage and reduces load and load fluctuation. This means that it can be made stronger against However, although it has been confirmed that the scrubbing process has a large effect, when considering the reliability of devices such as OA equipment, it is necessary to further increase the transmission force (torque). Furthermore, since the abraded surface and the rubber coated surface are in constant contact, there are many problems with the durability of each surface (scratching, peeling, etc.).

[0010] Furthermore, by making the surface of at least one of the magnetic material and the rotating body of the magnet uneven, the coefficient of dynamic friction on the contact surface is further increased to reduce slippage, and the meshing of the unevenness is used to reduce slippage. Proposals have also been made to eliminate this and make it resistant to loads and load fluctuations, as well as to improve rotation accuracy such as rotational unevenness and circumferential speed.

[0011] As mentioned above, the above-mentioned conventional techniques always have limiting conditions. First of all, when installing a rotating magnet between rotating magnetic bodies, be sure to place it on the side where it will bite during rotation.
And rotation can only be transmitted in one direction. Transmission of driving force by driving the magnetic idler is performed only by the magnetic force and biting force of the magnetic idler, without using the pressing force (side pressure, preload) of the idler. In particular, the use of biting force affects transmission efficiency. Therefore, if a magnetic idler is installed on the escape side during rotation where no biting force is generated, driving force cannot be transmitted. Also,
Even if a magnetic idler is installed on the biting side, if the direction of rotation is reversed, it becomes the escape side, and driving force cannot be transmitted in this direction of rotation. In other words, driving in both forward and reverse rotations was not possible with conventional magnetic idler drives.

FIGS. 4(a) and 4(b) are block diagrams of a conventional magnetic idler drive mechanism, with FIG. 4(a) being a perspective view and FIG.
b) is a plan view. In the figure, 12 is a pulley, 13 is a drive motor, 14 is an output shaft, 15 is a magnetic idler, 1
6 is a roller. The pulley 12 made of a magnetic material is attached to a roller 16 that requires rotational drive accuracy (rotation unevenness, circumferential speed, etc.). The output shaft 14 is a magnetic output shaft of the drive motor 13.

A magnetic idler 15 is interposed between the output shaft 14 and the pulley 12 and is attracted to both. In this embodiment, the outer peripheral surfaces of the output shaft 14 and the pulley 12 are subjected to a roughening process to reduce slippage. As shown in FIG. 4(b), in order to rotate the pulley 12 in the direction of the arrow (clockwise rotation), the magnetic idler 1 must be rotated in the direction of rotation.
It is also necessary to rotate the output shaft 14 to the left via the shaft 5. At this time, the magnetic idler 15 moves in the rotational direction of the output shaft 14 (
(clockwise rotation), it must be located on the side where biting force is generated. When the magnetic idler 15 is positioned on the lower side of the diagram and the output shaft 14 is rotated to the left, the magnetic idler 15 escapes and no biting force is generated. Therefore, the magnetic idler 15 rotates clockwise as the output shaft 14 rotates counterclockwise due to its attraction force, but the output shaft 14 rotates clockwise.
Since a transmission force sufficient to transmit the driving force of the drive motor 13 is not generated to the contact surface between the pulley 12 and the pulley 12, the pulley 12 does not rotate. Also, in the same way, if the output shaft 14 is rotated clockwise in the state shown in the figure, in the opposite direction to the previous one,
Since the magnetic idler 15 runs away, the pulley 12 will not rotate clockwise.

As described above, in the conventional magnetic idler drive mechanism, the magnetic idler is always positioned on the biting side and can only be rotated in one direction in which biting force is generated. In other words, it cannot be driven in both forward and reverse directions.

[0015]

[Object] The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a drive transmission mechanism using a magnetic idler drive capable of both forward and reverse rotation.

[0016]

[Structure] In order to achieve the above objects, the present invention provides (1)
Two or more magnetic rotating bodies spaced apart from each other include a magnetic rotating body that is located between the magnetic rotating bodies and can attract the magnetic rotating bodies by magnetic force, In the drive transmission mechanism that transmits rotational force to rotating bodies, the other rotating body is provided between the magnetic rotating bodies and at a position facing one of the magnetic rotating bodies, or ( 2) Two or more magnetic rotating bodies spaced apart from each other,
A drive transmission mechanism that includes a rotating magnetic body that is located between the magnetic rotating bodies and can attract the magnetic rotating body by magnetic force, and transmits rotational force to the magnetic rotating body,
At least one other rotating body is provided at a position between the magnetic rotating bodies and facing one of the magnetic rotating bodies, and (3) the above (1) or (2).
), the other rotating body is also a magnetic rotating body. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a block diagram for explaining one embodiment of the drive transmission mechanism according to the present invention, which is a magnetic idler drive mechanism capable of rotating in both forward and reverse directions. Figure (a) is a perspective view, and figure (b) is a plan view. In the figure, 1 is a roller, 2 is a magnetic pulley, 3 is a drive motor, 4 is a magnetic output shaft of the drive motor, and 5a and 5b are magnetic idlers. Magnetic idlers 5a and 5b are interposed so as to face the output shaft 4 and the pulley 2, and are attracted to both. However, the magnetic idlers 5a and 5b must not come into contact with each other.

As shown in FIG. 1(b), when the output shaft 4 is rotated counterclockwise (in the direction of the solid line arrow), the magnetic idler 5
Both a and 5b rotate clockwise (in the direction of the solid line arrow). Since the magnetic idler 5a is wedged in and the magnetic idler 5b is retracted, the driving force is transmitted by the magnetic idler 5a, and the pulley 2 rotates to the left (in the direction of the solid arrow). Therefore, the magnetic idler 5b only rotates with the magnetic idler 5b and does not perform much of a drive transmission function. Next, when the output shaft 4 is rotated clockwise (in the direction of the dotted arrow), the opposite action occurs and the operation occurs, so the driving force is transmitted by the magnetic idler 5b, and the pulley 2 rotates clockwise. (in the direction of the dotted arrow). Therefore, both forward and reverse rotational driving is possible.

In addition, when two magnetic idlers are used as described above, their own adsorption force and the force of pulling each other together are added to the biting force, so as explained as the prior art, it is better than the case of FIG. 4. Transmission power can be improved. That is, it also has the effect of reducing slippage and improving transmission efficiency.

Next, in the case of FIG. 1, one of the magnetic idlers is made of a magnetic material. Specifically, the rotating body 5a is made into a magnetic idler, and the rotating body 5b is made into an idler made of a magnetic material such as mild steel. Similar to the magnetic idler 5a, synthetic rubber is wrapped around the outer peripheral surface of the magnetic idler 5b. Magnetic idler 5b
Because the magnetic idler 5a does not separate or shift from the gap between the output shaft 4 and the pulley 2 due to its attractive force, it exhibits the same function and effect as the magnetic idler. Therefore, as described above, it is possible to drive in both forward and reverse directions, and furthermore, a magnetic idler can be manufactured much cheaper than a magnetic idler.

Furthermore, in the case of FIG. 1, one of the magnetic idlers is made of a non-magnetic material. In this case, the attraction force of the magnetic idler cannot be used, so a guide means is required to prevent the non-magnetic idler from separating or shifting, but it does not have the same function and effect as the magnetic idler. Can be done. Non-magnetic idlers can be made cheaper and lighter than magnetic idlers and non-magnetic idlers. Although the embodiments described above involve two separated magnetic rotating bodies (output shaft 4, pulley 2), the present invention is not limited thereto, and the magnetic rotating bodies (pulleys) are It doesn't matter how many there are.

FIG. 2 is a block diagram of the magnetic idler.
In the figure, 8 is synthetic rubber, 10 is a yoke (magnetic material), and 11 is a permanent magnet. It has a structure in which a permanent magnet 11 is sandwiched between a magnetic yoke 10 and a thin layer of synthetic rubber 8 is wrapped around the outer circumferential surface of the permanent magnet 11 to improve the coefficient of dynamic friction.

FIG. 3 is a diagram showing another embodiment of the drive transmission mechanism of the present invention. In the figure, 6 is a magnetic idler, 7 is a pulley, and other parts having the same functions as in FIG. 1 are designated by the same reference numerals. It is attached. That is, in three spaced magnetic rotating bodies (output shaft 4, pulleys 2, 7), two magnetic idlers 5a, 5b are placed between the output shaft 4 and the pulley 2,
One magnetic idler 6 is interposed between the output shaft 4 and the pulley 7.

When the output shaft 4 is rotated to the left (in the direction of the solid line arrow), the pulley 2 is rotated to the left (in the direction of the solid line arrow) as in the case of FIG. On the other hand, the pulley 7 is also rotated to the left (in the direction of the solid arrow) by the magnetic idler 6. When the output shaft 4 is rotated clockwise (in the direction of the dotted arrow), the pulley 2 rotates clockwise (in the direction of the dotted arrow) as the driving force is transmitted by the magnetic idler 5b, as in the case of FIG. However, since the magnetic idler 6 runs away in this direction of rotation, the pulley 7 does not rotate. Therefore, with the configuration shown in Fig. 3, the driving force is transmitted to both pulleys 2 and 7 in the case of counterclockwise rotation (in the direction of the solid line arrow), but the driving force is transmitted to only pulley 2 in the case of right rotation (in the direction of the dotted line arrow). Driving force is transmitted. In the case of clockwise rotation, the magnetic idler 7 ends up acting as a clutch. For example, if paper transport rollers are attached to pulleys 2 and 7 and the paper is sent, when the paper is rotated clockwise, the paper is transported by the paper transport roller of pulley 2, and the paper transport roller of pulley 7 only rotates as the paper is transported. It is.

[0025]

[Effect] As is clear from the above explanation, according to the present invention, another rotating body is similarly provided between the magnetic rotating bodies and at a position facing the magnetic rotating body. The magnetic idler mechanism can be driven in both forward and reverse directions. Furthermore, depending on how the magnetic idlers are combined, it is possible to realize a magnetic idler mechanism that can rotate in both forward and reverse directions and also has the function of a clutch. Furthermore, since the biting force of the idler can be improved, slippage can be reduced and transmission force (torque) can be increased.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram for explaining one embodiment of a drive transmission mechanism according to the present invention.

FIG. 2 is a configuration diagram of a magnetic idler.

FIG. 3 is a diagram showing another embodiment of the drive transmission mechanism according to the present invention.

FIG. 4 is a configuration diagram of a conventional magnetic idler drive mechanism.

[Explanation of symbols]

1... Roller, 2... Magnetic pulley, 3... Drive motor, 4
...Magnetic output shaft of drive motor, 5a, 5b...Magnetic idler

Claims (2)

[Claims] 1. Two or more magnetic rotating bodies spaced apart from each other include a magnetic rotating body located between the magnetic rotating bodies and capable of attracting the magnetic rotating bodies by magnetic force. ,
In the drive transmission mechanism for transmitting rotational force to the magnetic rotating bodies, the other rotating body is provided at a position between the magnetic rotating bodies and facing one of the magnetic rotating bodies. A drive transmission mechanism featuring: 2. Two or more magnetic rotating bodies spaced apart from each other include a magnetic rotating body located between the magnetic rotating bodies and capable of attracting the magnetic rotating bodies by magnetic force. ,
In the drive transmission mechanism for transmitting rotational force to the magnetic rotating bodies, at least one rotating body is located between the magnetic rotating bodies and facing one of the magnetic rotating bodies. A drive transmission mechanism characterized by being provided.