JPS5832048Y2 - Axis rotation direction reversal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational direction reversing device for a shaft that can rotate a driven shaft forward and reverse at regular intervals using a drive source that always rotates in one direction.

Generally, when driving various devices, if the driving direction is always only one direction, there are many cases where the intended purpose cannot be achieved.

Conventionally, in such cases, a motor that can rotate forward and backward is used as the drive source, but such a motor that can rotate forward and backward is significantly more expensive than a motor that rotates in only one direction. Furthermore, in a device in which forward rotation and reverse rotation are always repeated at regular intervals, it is extremely uneconomical to use a motor that can freely rotate in forward and reverse directions.

In order to eliminate this drawback, there are methods to use cams and gears, but cams are not suitable for transmitting large driving force, and gears are difficult to use when the distance between the drive source and the driven shaft is long. There were some drawbacks that made it unsuitable.

In developing a conveying device that continuously conveys objects from a conveyed position to a conveyed position, the inventors of the present invention determined that the driven shaft that operates the object holding device that holds and releases the object should be As a result of various research studies, we developed an innovative shaft that uses only a chain that can transmit large amounts of power easily and reliably. He succeeded in developing a rotational direction reversal device and completed the present invention.

That is, the present invention includes a sprocket fixed to a driven shaft that is driven by a drive sprocket fixed to a drive shaft that is rotated in only one direction by a drive source, and is part of a drive chain that rotates along a predetermined trajectory. A portion of the driven chain that engages with the driving sprocket and can rotate the driven sprocket in either forward or reverse direction is pivotally mounted, and when the driving sprocket rotates, the driving chain rotates. so that the driven chain reciprocates through the pivot joint to alternately rotate the driven sprocket in forward and reverse directions, and the driven chain is secured to the driven sprocket. The present invention provides a shaft rotational direction reversing device characterized by having a length that can be maintained at all times to rotate the driven sprocket.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a shaft rotation direction reversing device according to the present invention will be described in detail with reference to the drawings.

Figure 1 is an explanatory diagram showing the structure of an embodiment in which there are two drive-side sprockets that engage with the drive chain that is directly rotated by the drive source, and Figure 2 is the rotation of the driven shaft in Figure 1. An explanatory diagram showing the speed, FIG. 3 is an explanatory diagram showing the structure in an embodiment in which there are three drive-side sprockets that engage with a drive chain that is directly rotated by a drive source, and FIG. FIG. 5 is an explanatory diagram showing the rotational speed of the driven shaft in FIG. FIG. 6 is an explanatory diagram showing the rotational speed of the driven shaft in FIG. 5.

In the drawing, 1 is a drive shaft that is rotated in only one direction by a drive source such as a motor (not shown) that rotates at a constant speed in only one direction, 2 is a drive side sprocket fixed to the drive shaft 1, and 3 is a drive side A drive chain that engages with sprocket 2 and is driven by drive side sprocket 2 to rotate on a predetermined trajectory; 4 and 4' engage with drive chain 3 and determine the trajectory on which drive chain 3 rotates. 5 is a guide that is brought into contact with the drive chain 3 so that the drive chain 3 rotates along a predetermined trajectory; 6 is a driven shaft that rotates forward and reverse at a predetermined period; 7;
is a driven side sprocket fixed to the driven shaft 6,
Reference numeral 8 denotes a driven chain that engages with the driven sprocket 7 and can rotate the driven sprocket 7 in either forward or reverse directions. The sprocket 7 has a length that allows the sprocket 7 to be rotated while maintaining the sprocket 7 at all times, and a portion of the sprocket 7 is pivotally attached to a portion of the drive chain 3.

The fact that the driven chain 8 has the above configuration means that tension is applied to the driven chain 8 and the driven chain 8
This means that the movement of the driven sprocket 7 is faithfully transmitted as the rotational force of the driven sprocket 7. In order to satisfy this condition, the driven chain 8 must be connected to the driven sprockets 7 and 9 as shown in FIG. In some cases, the rack is an endless chain that is passed between the two, or as shown in FIGS. There are cases where

In this configuration, when the drive shaft 1 is rotated at a constant speed in one direction by the drive source, the drive chain 3 is driven by the drive side sprocket 2 fixed to the drive shaft 1, and the drive chain 3 is rotated between the drive side sprockets 2 and 4. Side sprocket 2, 4
．． 4' or between the drive side sprockets 2 and 4 guides 5.

Then, the pivoted part of the driven chain 8, a part of which is pivotally connected to this rotating part of the driven chain 3, also rotates along the locus of the rotation of the drive chain 3. .

Therefore, when the driving sprocket 2 rotates and the driving chain 3 rotates in this way, the driven chain 8 reciprocates through the pivot joint that is pivotally connected to a part of the driving chain 3, and the driven chain 8 rotates. The side sprockets 7 are alternately rotated in forward and reverse directions.

In this rotation, in the case of a state as shown in FIG. 1 in which there are two drive-side sprockets that play the role of defining the locus of rotation of the drive chain 3, the drive chain 3 and the driven chain 8 are pivotally connected. Since the moving distance in which the part moves downward and the moving distance in which it moves upward is the same, the driven shaft 6
As shown in FIG. 2, the rotation speed is the same in forward rotation and reverse rotation, and the forward rotation time and reverse rotation time are the same.

In addition, in the case of the state shown in FIG. 3 in which there are three or more drive side sprockets that rotate the drive chain 3, the time required for the pivot joint between the drive chain 3 and the driven chain 8 to move downward and upward If the drive chain 3 rotates counterclockwise because the movement time is different, as shown in FIG. The clockwise reversal speed can be slow and the reversal time can be long.

Further, the drive chain 3 is provided with a guide 5 located on the same radius as the driven sprocket 7 fixed to the driven shaft 6.
In the case of the state shown in FIG. 5 in which the drive chain 3 and the driven chain 8 rotate along the guide 5, the driven chain 8 rotates along the guide 5. It is possible to form the rotational state of the driven shaft 6 as shown in FIG. 6, in which the driven shaft 6 is provided with a stop section so that it does not move.

The shaft rotational direction reversing device according to the present invention as described in detail above uses a chain and a sprocket as power transmission means, so it is possible to transmit a large force, and the structure is simple, so it can be easily used. The rotational speed of the driven shaft changes smoothly when transitioning from forward rotation to reverse rotation, so no unreasonable force is applied to the chain, shaft, or bearing, and you can freely set the forward rotation time and reverse rotation time. In addition, it is easy to transmit power even if the distance between the drive source and the driven shaft 6 is large, so if the device of the present invention is used in a fork lift mechanism of a forklift, safety can be improved. In addition, the arrangement as shown in FIG. 3 allows the lower drive side sprocket 4 to move up and down freely, and the right drive side sprocket 4'
If it is made horizontally movable, it has the advantage of being able to arbitrarily change the time between forward rotation and reverse rotation, and has great practical value.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the structure of an embodiment in which there are two drive-side sprockets that engage with the drive chain that is directly rotated by the drive source, and Figure 2 is the rotation of the driven shaft in Figure 1. An explanatory diagram showing the speed, FIG. 3 is an explanatory diagram showing the structure in an embodiment in which there are three drive-side sprockets that engage with a drive chain that is directly rotated by a drive source, and FIG. FIG. 5 is an explanatory diagram showing the structure of an embodiment in which the drive chain that is directly rotated by the drive source is a drive chain that is rotated along a guide. , FIG. 6 is an explanatory diagram showing the rotational speed of the driven shaft in FIG. 5. 1... Drive shaft, 2... Drive side sprocket, 3... Drive chain, 4.4'...
・Drive side sprocket, 5...Guide, 6...
... Driven shaft, 7 ... Driven side sprocket, 8 ... Driven chain, 9 ... Driven side sprocket, 10 ... weight.

Claims (1)

[Scope of utility model registration request] 1. A driven sprocket 2 fixed to a driven shaft 6 is a part of a drive chain 3 that rotates along a predetermined trajectory by being driven by a driving sprocket 2 fixed to a drive shaft 1 that is rotated in only one direction by a drive source. A part of a driven chain 8 that engages with the side sprocket 7 and can rotate the driven side sprocket 7 in either forward or reverse direction is pivotally mounted, and when the driving side sprocket 2 rotates, the driving side sprocket 7 rotates. When the chain 3 rotates, the driven chain 8 reciprocates through the pivot joint to alternately rotate the driven side sprocket 7 in forward and reverse directions. A shaft rotational direction reversing device characterized by having a length capable of rotating the driven side sprocket 7 while constantly maintaining engagement with the side sprocket 7. 2. A drive chain 3, which is driven by a drive sprocket 2 fixed to a drive shaft 1 that is rotated in only one direction by a drive source and rotates along a predetermined trajectory, is connected to two drive sprockets 2 and 4. A shaft rotational direction reversing device according to claim 1, which is a drive chain that rotates together. 3. A drive chain 3 that rotates along a predetermined locus is driven by a drive sprocket 2 fixed to a drive shaft 1 that is rotated in only one direction by a drive source (3 or more drive sprockets) 2, 4, 4', the rotating direction reversing device of a shaft according to claim 1, which is a drive chain that rotates by engaging with the shaft. 4. Any one of claims 1 to 3 of the utility model registration claims, in which the driven chain 8 that engages with the driven sprocket 7 fixed to the driven shaft 6 is an endless chain. A device for reversing the rotational direction of the shaft described in .