JPS6124873A - Safety device for drive power transmission - Google Patents

Abstract

PURPOSE:To prevent breakage of transmission parts by coupling the shaft on drive side with the shaft on load side through a coupling device, and by arranging so that it is decoupled in the even of overloading and that the drive motive is stopped. CONSTITUTION:Shaft 6 on drive side is coupled with the shaft 3 on load side through a coupling device such as a meshing clutch. This coupling device consists of flanges 8, 9 which engage together by their pawls having a tapered part 8a, 9a. The flange 9 is fixed to the shaft 3 on load side. The other flange 8 is fixed slidably to the shaft 6 on drive side and energized by a spring 10. At the time of overloading, the flange 8 moves against the action of this spring 10 to provide decoupling. This motion is sensed by a limit switch 11, and the drive motive is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a safety device for a driving force transmission mechanism within a machine body such as a copying machine.

(Prior Art) Conventionally, within the main body of a machine such as a copying machine, a means for transmitting driving force from a drive source such as a variable rotation motor to load-side devices such as a photoreceptor drum, paper feed device, developing machine, etc. has been used. For example, as shown in Fig. 1, the driving force is transmitted from the shaft 1 on the drive side to the shaft 3Vc of each device 2 on the load side using gears 4.5, and the driving force is transmitted using sprockets, chains, gears, etc. There was something to do. However, in these driving force transmission means, when a load other than a normal load c (hereinafter simply referred to as an overload) occurs on the device 2 side, there is no means to absorb the overload on the device 2 side, so the driving force is If the overload acts directly on the gear 4.5, sprocket, etc., which are the transmission parts of the machine, and causes damage to these parts, and if it takes a considerable amount of time to repair, please refrain from using the machine during that time. The drawback was that not only would work be delayed and the operator be inconvenienced, but the reliability of the machine itself could be lost.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the driving force transmission mechanism in the conventional copying machine, etc. when an overload condition occurs on the load side of the device, etc. The purpose is to provide a safety device for a driving force transmission mechanism that immediately detects overload and stops the operation of the machine body, thereby preventing damage to gears, tin rockets, etc. that are the driving force transmission parts. That is.

(Structure of the Invention) For this purpose, the present invention provides a coupling device such as a dog clutch at an appropriate position on the shaft of the various devices on the load side, and automatically connects the coupling portion of the coupling device when an overload occurs on the various devices. At the same time, the disconnection of the connection is detected by a detection mechanism such as a limit switch, and the signal is used to stop the operation of the drive section of the machine body, and the gears and sprockets that are the transmission parts of the drive force are stopped. This is to prevent damage such as.

(Embodiments) The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a sectional side view showing an embodiment of the safety device of the driving force transmission mechanism of the present invention, and FIG. 3 is an enlarged side view of the driving and driven flange portions of the coupling device.

In these figures, when transmitting the driving force from the drive side shaft 1 to the shaft 3 of various devices 2 via the gears 4 and 5, there is a gap between the shaft 6 of the load side gear 5 and the shaft 3 of the device 2. A coupling device 7 such as a dog clutch is attached at a suitable location so that the driving force from the shaft 1 is transmitted to the device 2 via the coupling device 7. and the connecting device 7
The drive flange 8 and the driven flange 9 are provided with tapers 8a... and 98... on the pawl portions thereof, and the drive flange 8 is provided so as to be movable in the axial direction, and the drive flange 8 is provided so as to be movable in the axial direction. An elastic body 1° such as a coil spring is arranged to press the flange 8 against the driven flange 9, while a detection mechanism 11 such as a limit switch is arranged at a suitable location outside the drive flange 8. and the detection mechanism 1
Reference numeral 1 is electrically connected to a motor driver or the like of a drive unit (not shown).

The present invention is constructed as described above. Next, its operation will be explained.

From now on, it is assumed that the device 2 is in a normal load state. In this case, the driving force of the drive-side shaft l is transmitted via the gear 4.5 to the shaft 6, and from this shaft 6 via the coupling device 7 to the shaft 3 of the device 2, causing it to rotate. At this time, the claw portions of the driving flange 8 and the driven flange 9 of the coupling device 7 are tapered at the respective locations.
Thrust force is applied by A..., and the driven flange 9
The drive flange B tries to come off, but the drive flange 8 is pressed against the driven flange 9 by the elasticity of an elastic body 100 placed behind it and does not come off, so the detection mechanism 11 does not operate and the device On the other hand, if an overload occurs on the device 2 side, the transmission of the driving force from the drive side to the device 2 will continue.

The thrust force of the pawls of the drive flange 8 and the driven flange 9 of the coupling device 7 is excessively increased due to the tapers 8a..., 9a...
moves in the axial direction toward gear 5 against the elasticity of. The detection mechanism 11 is actuated by the movement of the drive flange 8, issues a command to stop the rotation of the motor driver, etc., stops it, stops the shaft from rotating 10 times, and causes the device 2 to stop rotating.
This prevents damage to gears 4.5, which are drive force transmission parts, due to side overload.

(Effects of the Invention) The present invention is configured and operates as described above, and when an overload occurs on the device 2 side, the driving flange 8 of the coupling device 7 presses it against the driven flange 9. K automatically moves in the axial direction against the elasticity of the elastic body 1o for holding the position, moves away from the driven flange 9, operates the limit switch 11, etc., and stops all operation of the drive system.
Therefore, it is possible to almost completely prevent the gear 4.5, tin rocket, etc., which are the transmission parts of the driving force, from being damaged due to overload on the equipment 2 side.
Therefore, the repair can be done in an extremely short time by removing the cause of the overload on the equipment 2 side, which makes it possible to keep the cost of the work extremely low, and also helps to further improve the reliability of the machine itself 5. It has a very effective effect.

It goes without saying that the safety device for the driving force transmission mechanism according to the present invention can be used not only for transmission mechanisms such as copying machines, but also for large and small machines.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional driving force transmission mechanism using gears, FIG. 2 is a cross-sectional side view showing an embodiment of the safety device for the driving force transmission groove of the present invention, and FIG. 3 is the same. FIG. 3 is an enlarged side view of the drive and driven flange portions of the coupling device. In the diagram, 1... Drive side shaft, 2... Equipment, 3...
・Shaft, 4.5... Gear, 6... Yaft, 7
... Connecting device, 8... Drive flange, 8a... Taper, 9... Followed flange, 911... Taper, 10... Elastic body, 11... Detection mechanism. Figure 1

Claims (1)

[Claims] In a drive force transmission mechanism that transmits driving force from a shaft on the drive side to the shafts of various devices on the load side using gears, sprockets, chains, etc., drive flanges and driven A taper is provided at the pawl between the flange and the driving flange is provided so as to be elastically movable in the axial direction, and a coupling device equipped with a detection mechanism such as a limit switch is disposed on one outside of the flange. When an overload occurs on the side, the drive flange moves in the axial direction relative to the driven flange, activating the detection mechanism, and stopping the operation of the drive system to prevent damage to the gears, sprockets, etc. A safety device for the driving force transmission mechanism.