JPS6337552Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drive mechanism that always provides rotation in the same direction to an output gear even if the driving direction changes due to reciprocating motion.

Conventionally, as this type of drive mechanism, for example, the first
There are some as shown in Fig. and Fig. 2. In the diagram,
Reference numeral 1 denotes a shaft, and two one-way clutches 2 and 3 are attached to the shaft spaced apart in the longitudinal direction so as to be able to transmit drive in the same rotational direction. Closely fitted pulleys 4 and 5 are mounted on the outside of the one-way clutches 2 and 3, respectively. In this drive mechanism, wire ropes 6 and 7 are wound once around pulleys 4 and 5, respectively, and stretched in parallel with a distance of the diameter of the pulleys 4 and 5 as shown in the figure. For example, when the wire rope 6 is pulled to the right in the figure and the drive mechanism moves to the right, the pulley 4 and one-way clutch 2 rotate clockwise together, and this clockwise rotation enables drive transmission, and the shaft 1 Rotate to the right. At this time, the lower pulley 5 and one-way clutch 3 rotate to the left, and the transmission from the one-way clutch 3 is cut off, so that no force is applied to the shaft 1. Conversely, when the wire rope 7 is pulled to the left and the drive mechanism moves to the left, the opposite movement is performed. That is, even if the input direction or the moving direction of the drive mechanism changes, the shaft 1 rotates in the same direction as shown in the figure.

However, since this drive mechanism uses two expensive one-way clutches 2 and 3,
Although it is small and lightweight, it is expensive as a whole, and the work of hanging the wire rope is troublesome.

This invention was made in view of such problems with the drive mechanism, and the purpose of the invention is to always rotate in the same direction even if the direction of movement of the platform, which reciprocates linearly, changes. The purpose of the present invention is to provide a structure in which a drive mechanism that can be taken out from an output gear rotatably supported on a traveling platform can be manufactured at low cost and with a simple configuration.

Next, this invention will be explained based on the drawings.

3 to 5 are diagrams showing an embodiment of this invention. In the figure, reference numeral 11 denotes a frame gear, which is constructed by cutting or attaching teeth or pitch belts to the frame 11a to form a rack that extends long in the reciprocating direction of the platform. A first driving gear 1 is attached to the traveling platform 12 that reciprocates linearly with respect to the frame gear 11.
3. Holes 12a, 12b, 12c, and 12d are provided to support the second drive gear 14, output gear 15, and idler gear 16 in predetermined positional relationships, respectively. The first drive gear 13 is rotatably mounted in the hole 12a so as to always mesh with the frame gear 11, and the output gear 15 is rotatably mounted in the hole 12c so as to mesh with the frame gear 11 at all times.
and is rotatably mounted in a fixed position apart from the first drive gear 13. 2nd drive gear 1
4 is always meshed with frame gear 11, and output gear 1
It is movably and rotatably mounted through a long hole 12b extending in the reciprocating direction of the carriage 12 so as to selectively engage with the carriage 5. Moreover, the idler gear 16 is
The operating platform has an arcuate shape with a radius equal to the distance between the centers of the first drive gear 13 and the idler gear 16, with the hole 12a as the center so as to constantly mesh with the first drive gear 13 and selectively mesh with the output gear 15. It is movably and rotatably mounted in an elongated hole 12d extending in a curved direction in a direction substantially perpendicular to the reciprocating direction of 12. Note that 15a is the shaft of the output gear 15.

To explain the operation of this drive mechanism, first, as shown in FIG.
When moving to the 4 side (right side in the figure), the first and second drive gears 13 and 14 are connected to the frame gear 11.
and rotates counterclockwise (arrow in the figure). When the first drive gear 13 rotates counterclockwise, the idler gear 16 rotates clockwise and moves in the direction away from the output gear 15 within the long hole 12d of the operation platform 12, and is disengaged from the output gear 15. Ru. When the second drive gear 14 rotates counterclockwise, the second drive gear 14 is inserted into the operating platform 12 within the elongated hole 12b of the operating platform 12.
The output gear 15 tends to move in the opposite direction to the direction of movement of the output gear 15 and more reliably mesh with the output gear 15, thereby rotating the output gear 15 clockwise. If necessary, output can also be taken out from the shaft 15a of the output gear 15.

On the other hand, when the navigation platform 12 changes from the direction of the arrow in FIG. 3 to move toward the first drive gear 13 (left side in the figure) as shown in FIG.
The first and second drive gears 13, 14 rotate clockwise. As a result, the idler gear 16 rotates counterclockwise, moves within the elongated hole 12d, meshes with the output gear 15, rotates the output gear 15 clockwise, and moves the second drive gear 14 within the elongated hole 12b. and then separated so as to break off the meshing with the output gear 15. Therefore, when the direction of movement of the operating platform 12 changes, the meshing relationship of the gear train changes without any other operation, and the rotation direction of the output gear 15 always remains the same.

As explained above, the present invention consists of a traveling platform that reciprocates linearly, a fixed frame gear having teeth extending in the reciprocating direction of the traveling platform, and a fixed frame gear that is rotatably supported on the traveling platform. a first drive gear that is always in mesh with the frame gear; an output gear that is rotatably supported on the platform and is spaced apart from the first drive gear and the frame gear;
an idler gear that is rotatably supported by the driving platform and is always engaged with the first drive gear and selectively engaged with the output gear; and a second drive that is always engaged with the frame gear and selectively engaged with the output gear. The operating platform includes a gear, and when the operating platform moves toward the first driving gear, the output gear and the second driving gear are disengaged, and the operating platform moves toward the second driving gear. A long hole extends in the reciprocating direction of the platform and guides the shaft of the second drive gear so that the output gear and the second drive gear mesh with each other when the platform moves toward the first drive gear. The operating platform is configured such that the output gear and the idler gear are engaged with each other, and when the operating platform moves toward the second drive gear, the output gear and the idler gear are disengaged, and the engagement with the first driving gear is maintained. Since it is characterized by having at least an elongated hole that extends in a curve in a direction substantially orthogonal to the reciprocating direction of the idler gear and guides the shaft of the idler gear, even if the operating direction of the operating platform that reciprocates linearly changes. The present invention also has the effect of producing a drive mechanism that can always rotate in the same direction from an output gear that is rotatably supported on a driving platform at a low cost and with a simple configuration, and also ensures reliable power transmission. can.

[Brief explanation of the drawing]

1 and 2 show a conventional drive mechanism, in which FIG. 1 is a plan view, FIG. 2 is a front view, and FIGS.
Fig. 5 shows a drive mechanism showing an embodiment of this invention, Fig. 3 is a schematic diagram showing the meshing state of the gear train when the operating platform moves to the right, and Fig. 4 shows the operating platform moving to the left. FIG. 5 is a partial plan view showing the hole positional relationship of the navigation platform. 11...Frame gear, 12...Operation platform, 13
...First drive gear, 14...Second drive gear, 15
...Output gear, 16...Idler gear.

Claims (1)

[Claims for Utility Model Registration] A moving platform that reciprocates linearly; a fixed frame gear having teeth extending in the reciprocating direction of the moving platform; and a fixed frame gear rotatably supported by the operating platform, the frame a first drive gear that constantly meshes with the gear; an output gear that is rotatably supported by the navigation platform and provided spaced apart from the first drive gear and the frame gear; and an output gear that is rotatably supported by the navigation platform. , an idler gear that constantly meshes with the first drive gear and selectively meshes with the output gear, and a second drive gear that constantly meshes with the frame gear and selectively meshes with the output gear, The platform is configured to output the output gear when the output gear and the second drive gear are disengaged when the platform moves toward the first drive gear, and when the platform moves toward the second drive gear. an elongated hole that extends in the reciprocating direction of the platform and guides the shaft of the second drive gear so that the gear and the second drive gear mesh with each other, and the platform moves toward the first drive gear. When the output gear and the idler gear are engaged with each other, and when the traveling platform moves toward the second drive gear, the output gear and the idler gear are disengaged from each other. A drive mechanism comprising at least an elongated hole extending in a curve in a direction substantially orthogonal to the reciprocating direction of the traveling platform so as to maintain meshing with each other and guiding the shaft of the idler gear.