JPH05149392A - Power transmission device - Google Patents

Abstract

PURPOSE:To use outputs from two decelerators without any loss in a power transmission device to get one output by way of using two motors and the decelerators respectively inside of a carrier roller used a facsimile device, etc. CONSTITUTION:By means of such constitution as to input outputs of two decelerators 3a, 3b respectively to a first sun gear 6a and a second sun gear 6b of a differential epicyclic gear device 6 and to take them as one rotational output from a carrier roller 2 fixed on a revolving arm 6e or the revolving arm 6e of the differential epicyclic gear device 6, even in the case when there is a difference in rotational speed between the first sun gear 6a and the second sun gear 6b, the rotational speed comes to be an average of the number of rotation of the two decelerators and output torque comes to be the sum of output torques of the two decelerators, and the outputs from the two decelerators can be used without waste.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact power transmission device for a sheet conveying device used in a facsimile machine or the like.

[0002]

2. Description of the Related Art Conventionally, a sheet conveying device has been used for various devices such as a PPC device and a facsimile device, and the miniaturization of these devices has been rapidly advanced in recent years, and a downsizing of a power transmission device is required. ing.

A conventional power transmission device will be described below. In FIGS. 7 to 9, 1 is a motor, 2 is a conveyance roller, 3 is a speed reducer for reducing the output of the motor 1 to a required number of rotations, 4 is a driven roller which is in contact with the conveyance roller 2,
Reference numeral 5 is a rotation speed sensor for measuring the rotation speed of the carrying roller 2, 7 and 8 are bearings for fixing the carrying roller 2 freely in the radial and thrust directions, and 9 is a motor 1 with respect to the carrying roller 2. It is a bearing that is freely rotatable and fixed in the radial and thrust directions.

With respect to the power transmission device having the above-described respective constituent elements, the relationship and operation of the respective constituent elements will be described below.

When the motor 1 is built in the conveying roller 2 for downsizing of the entire apparatus, it is difficult to use a high torque motor because the size of the motor 1 is limited. The output of the motor 1 driven by a control device (not shown) is transmitted to the input shaft of the speed reducer 3 in order to reduce the rotation speed and torque required for conveying the sheet by the conveying roller 2. It The output shaft of the speed reducer 3 is the transport roller 2
The output decelerated is transmitted to the conveyance roller 2. The rotation speed of the transport roller 2 is measured by the rotation speed sensor 5 and is fed back to a control device (not shown) so that the rotation speed of the transport roller 2 is constantly controlled.

Further, as shown in FIG. 10, there is also a power transmission device using two motors 1 and two speed reducers 3, respectively.

[0007]

However, in the above-mentioned conventional structure, the motor 1 and the speed reducer 3 are arranged in a limited space inside the conveying roller 2, so that the small motor 1 and the speed reducer 3 are installed. It is necessary to use it and output torque is insufficient, and in order to compensate for the torque shortage, when a high torque motor is used, the motor diameter inevitably becomes large and the entire device becomes large. Had a point.

If two motors 1 and two speed reducers 3 are used, respectively, and there is a difference in rotation speed between the two motors,
In order to match the motor with the slower rotation speed to the motor with the faster rotation speed, the load may be reversed, and the required output torque may not be obtained. Has a problem that the two motors require a rotation speed sensor / control device for each motor, which complicates the control device.

The present invention solves the above-mentioned conventional problems. Even if there is a difference in the rotational speed and output torque of the output shafts of the two speed reducers with a simple structure, the output from the differential planetary gear device is , The rotational speed is the average of the rotational speeds of the two speed reducers, and the output torque is the sum of the output torques of the two speed reducers, and it is an object of the present invention to provide a power transmission device that can use the output from the two speed reducers without waste. To do.

[0010]

In order to achieve this object, the power transmission device of the present invention inputs the outputs of two speed reducers to each of the first sun gear and the second sun gear of the differential planetary gear device. However, the rotation arm of the differential planetary gear device or the conveying roller fixed to the rotation arm is taken out as one rotation output.

[0011]

With this configuration, even if there is a difference in the rotational speed and output torque of the output shafts of the two reduction gears, the output from the revolution arm of the differential planetary gear device is the rotational speed of the two reduction gears. And the output torque is the sum of the output torques of the two speed reducers, and the outputs from the two speed reducers are used without waste.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 showing an embodiment of the present invention, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. 1 to 6, 3a and 3b are reduction gears for reducing the output of the motors 1a and 1b to a required number of revolutions, and 6 is a first sun gear 6a and a second sun gear 6
A differential planetary gear device having b as an input shaft and an orbital arm 6e as an output shaft, and 6f is a shaft fixed to the orbital arm 6e for rotatably fixing the planetary gears 6c and 6d. 9, 1
0, 11 and 12 are the motor 1a and the speed reducer 3, respectively.
It is a bearing for fixing a, the speed reducer 3b and the motor 1b with respect to the transport roller 2 in a freely rotatable and radial / thrust direction.

With respect to the power transmission device having the above-mentioned respective components, the relation and operation of the respective components will be described below.

The outputs of the motors 1a and 1b driven by one controller (not shown) are transmitted to the input shafts of the speed reducers 3a and 3b. The output shafts of the speed reducers 3a and 3b are respectively the first sun gear 6a of the differential planetary gear device,
It is connected to the second sun gear 6b.

Here, the first sun gear 6a and the second sun gear 6
When the rotation speeds of b are the same, the planetary gears 6c and 6d only revolve without rotating. At this time, the planetary gears 6c and 6
The rotation speed of the revolution of d is equal to the rotation speed of the output shafts of the speed reducers 3a and 3b. The orbital torque of the planetary gears 6c and 6d is the sum of the output torques of the speed reducers 3a and 3b.
When there is a difference in rotation speed between the first sun gear 6a and the second sun gear 6b, the planetary gears 6c and 6d rotate by the rotation speed difference between the first sun gear 6a and the second sun gear 6b, and The 1st sun gear 6a and the 2nd sun gear 6b revolve at the average rotation speed of each rotation speed. The orbital torque of the planetary gears 6c and 6d is the sum of the output torques of the speed reducers 3a and 3b.

The planet gears 6c and 6d revolve around the shaft 6f.
Is transmitted to the revolution arm 6e via. The revolution arm 6e is fixed to the conveyance roller 2, and the conveyance roller 2 rotates at the same rotation speed as the revolution arm 6e.

The rotation speed of the transport roller is measured by the rotation speed sensor 5 and is fed back to a control device (not shown). If there is a difference in the rotation speeds of the motors 1a and 1b, the motor 1a remains uncorrected.
The rotation speeds of 1 and 1b will be changed, but the above-described operation allows operation without problems.

[0019]

As is apparent from the above description of the embodiments, the present invention inputs the outputs of the two speed reducers to the first sun gear and the second sun gear of the differential planetary gear device, respectively.
When there is a difference in the rotational speed and output torque of the output shafts of the two speed reducers with a simple structure due to the structure in which the rotation arm of the differential planetary gear device or the conveying roller fixed to the revolution arm is taken out as one rotation output. However, the output from the revolution arm of the differential planetary gear set is the average of the rotational speeds of the two speed reducers and the output torque is the sum of the output torques of the two speed reducers, and the output from the two speed reducers is wasted. It is possible to realize an excellent power transmission device that can be used without any use.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a part of a power transmission device according to an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a schematic perspective view of the power transmission device.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a perspective view of a differential planetary gear device of the power transmission device.

FIG. 5 is a perspective view showing the interior of the power transmission device with a part of the differential planetary gear device omitted.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a schematic perspective view of a conventional power transmission device.

FIG. 8 is a schematic perspective view showing the inside by partially removing the power transmission device.

9 is a sectional view taken along line CC of FIG.

FIG. 10 is a schematic front sectional view of another conventional power transmission device.

[Explanation of symbols]

 1a ・ 1b Motor 2 Conveying rollers 3a ・ 3b Reducer 6 Differential planetary gear unit 6a First sun gear 6b Second sun gear 6c ・ 6d Planetary gear 6e Revolution arm

Claims (2)

[Claims] 1. A differential planetary gear device having an input shaft composed of a first sun gear and a second sun gear and an output shaft composed of a revolution arm, and a first sun gear and a second sun gear of the differential planetary gear device. A power transmission device comprising two rotary power devices connected to each of the two, so that one rotation output can be obtained from the revolution arm of the differential planetary gear device. 2. The power transmission device according to claim 1, wherein one rotation output can be obtained from the conveying roller fixed to the revolution arm.