JPH06213301A - Differential gear for rotating one driving apparatus with two motors - Google Patents

Abstract

PURPOSE:To enable a heavy object to be moved at a high speed and to be stopped at its stop position with high accvracy. CONSTITUTION:Bevel gears 5 and 6 fitted around an driving shaft 1 rotatably from both sides are engaged with a bevel gear 4 which is fitted around an induction shaft 3 which is perpendicularly to the shaft line 2 of the driving shaft 1. A pulley 8 which drives a movable object is attached to the driving shaft 1, and pulleys 9, 10 are attached to gears 5, 6 respectively, the belt 12 of a high power motor 11 is laid around the pulley 9, and the belt 14 of a low speed motor 13 is laid around the pulley 10. When heavy objects are moved at a high speed through, this constitution, the heavy objects are moved by the high power motor 11, and when heavy objects are to be moved by a low speed motor 13 at a low speed immediately before stopping, the heavy objects can be stopped at the stop position with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drive mechanism that requires high-power high-speed operation and a highly accurate stop position.

[Prior Art] It can be said that high output high speed operation and high precision position stop cannot be achieved with only one motor. Recently, a servo motor has been used as a solution to it, but it is very expensive.

[Problems to be solved by the invention] When moving a heavy movable object at high speed, a large motor is used, and even after the large motor stops immediately before the stop position, another low speed motor slowly moves the movable object to achieve a highly accurate position. The purpose is to stop.

[Means for Solving the Problem] An induction shaft is provided in a direction perpendicular to the drive shaft, and a bevel gear fitted to this shaft is meshed with a bevel gear fitted to the same shaft as the drive shaft from both sides. ,
A pulley or spur gear (hereinafter abbreviated as "conductor") is connected to each gear, and a large motor is connected to one of the three conductors and a low-speed small motor is connected to one of the three. Connect the other one to the movable object.

[Operation and Example] The operation will be described with reference to the drawings. A bevel gear 4 rotatably fitted to a guide shaft 3 provided at a right angle to an axis 2 of a drive shaft 1 shown in FIG. In the configuration of the model gears 5 and 6, the shaft 3 of the bevel gear 4 is coupled to the drive shaft 1 by a shaft fixing device 7, and a pulley 8 for driving a movable object is attached to the drive shaft 1 to form a bevel gear. Pulleys 9 and 10 are attached to 5 and 6, respectively, and a large output motor 1 is attached to the pulley 9.
Put the belt 12 of 1 and the low speed motor 1 on the pulley 10.
When the belt 14 of No. 3 is hung, the large output motor 11 for explaining its action rotates at high speed and the pulley 9 rotates in the direction of the arrow mark. One of the gears 4 meshing with the bevel gear 5 rotates at the same speed as the bevel gear 5, but the one meshing with the bevel gear 6 is stopped, so the guide shaft 3 is The bevel gear 5 rotates in the same direction as the bevel gear 5 at a speed half the rotation speed of the bevel gear 5. When the low-speed motor 13 is rotating and the high-power motor 11 is stopped, the induction shaft 3 rotates at a speed as low as half of the low-speed bevel gear 6 on the same principle as above. 1/2 of the speed of the model gear 5 + 1/2 of the speed of the bevel gear 6 = the rotation speed of the induction shaft 3. Since the guide shaft 3 is fixed to the drive shaft 1 by the shaft fixing device 7, the pulley 8 rotates in the same manner as the guide shaft 3 to move the movable object. In this mechanism which operates as described above, when a movable object (not shown) is heavy or moves at a high speed, the force applied to the pulley 8 becomes large, so that the large output motor moves the movable object. However, in this case, since the stop position is uncertain due to the moving inertia of the movable object, the large output motor 11 is stopped a little earlier than the predetermined stop position, and the low speed motor 13 slowly moves to the predetermined stop position to stop. In this way, most of the movement of the movable object moves at a high speed, becomes a low speed immediately before the stop position, and can be stopped at a predetermined position with high accuracy while absorbing inertia.
In addition to the structure described above, the guide shaft 3 and the drive pulley 8 can be directly connected to each other and operated in the same manner as shown in FIG.

[Effects of the Invention] As described above, according to the present invention, when a heavy object is moved at high speed, a large output motor required for it is used for most of the high speed movement, and stop positioning uses a low speed motor. It is possible to stop at a predetermined position with high accuracy. If the number of places where only the low-speed motor is used is increased, it is possible to increase the number of low-speed moving parts of the movable object. Further, it has effects such as reaching the object at a low price without being expensive like a servo motor.

[Brief description of drawings]

 Fig. 1 shows the overall structure and working relationship. Fig. 2 is a perspective view when the induction shaft and the drive pulley are integrated [in the figure]. ． ． Drive shaft 2. ． ． Axis 3. ． ． Induction shaft 4. ． ． Bevel gear 5. ． ． Bevel gears 6. ． ． Bevel gear 7. ． ． Axis fixator 8. ． ． Pulley 9. ． ． Pulley 10. ． ． Pulley 11. ． ． Large output motor 12. ． ． Belt 13. ． ． Low speed motor 14. ． ． belt

Claims (1)

[Claims] Conductors are provided respectively for a bevel gear having an induction shaft in a direction perpendicular to the drive shaft and for a bevel gear fitted to the drive shaft and meshing with the bevel gear from both sides. A differential gear that rotates one drive shaft with two motors.