JPH0654147B2 - Rotary linear motion output device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary linear motion output device.

<Prior Art> As shown in FIG. 7, a conventional rack gear has teeth 2 linearly and planarly formed on one surface of a support 1 at intervals, and a pinion 3 is engaged with the teeth. It had a matching structure.

However, the above-mentioned conventionally known rack gear is intended for mutual conversion between the linear movement of the rack gear and the rotational movement of the pinion gear, and the rack gear alone cannot be rotated unless the pinion gear is rotated together. Further, the meshing of the pinion gear with the rack gear is performed only on the one surface side on which the teeth are formed.
It is possible. It has been impossible to rotate the rack gear, to make a linear motion while rotating the rack gear, and to set the meshing direction of the pinion in an arbitrary direction. Therefore, the conventional rack gear has a very narrow range of use and is inconvenient.

In order to solve such a drawback of the conventional rack gear, the applicant of the present patent application has proposed that the endless teeth which are independent at a predetermined pitch d ₁ along the axial direction around the outer peripheral surface of the rod-shaped base body 4 as shown in FIG. We have proposed a rack gear with the number 5 (Japanese Patent Application No. 60).
-75953).

The rack gear of FIG. 8 has endless teeth 5 which are independent around the outer peripheral surface of the rod-shaped base body 4 at a predetermined pitch d ₁ along the axial direction.
Therefore, as shown in FIG. 9, various gears 6 such as a pinion gear can be meshed with each other from all directions around the shaft, and the gear 6 can be moved by the arrow a ₁₁ or a ₁₂
It is possible to rotate the shaft in the direction of arrow a ₂₁ or a ₂₂ while performing a linear motion in the axial direction Z ₁ or Z _2, and to obtain a new rack gear that is a great leap from the conventional rack gear. To be

<Problems to be Solved by the Invention> However, in the rack gear shown in FIG. 8, a plurality of gears cannot be meshed with each other to cause the gears to perform a time lag operation. Since the time lag operation is indispensable when performing sequence control, etc.
With the rack gear shown in the figure, sequence control cannot be performed.

Therefore, the object of the present invention is to solve the above-mentioned problems, to allow various gears to be meshed with each of the rack gears from all directions around the shaft, and to perform axial rotation and linear motion in the axial direction. And a rotary linear motion output device capable of giving a time lag operation to a gear meshing with a rack gear.

<Means for Solving the Problems> In order to solve the problems described above, the rotary linear motion output device according to the present invention includes a rack gear, a first gear, and a second gear, and the rack gear has a plurality of gears. Each of the rack gears has endless teeth which are independent at a predetermined pitch along the axial direction around the outer peripheral surface of the rod-shaped base body, and are connected coaxially at intervals to form one shaft body. The first gear is rotationally driven by a rotary drive source and meshes with at least one of the rack gears,
A shaft is provided with an axial linear motion, or an axial rotational motion and an axial linear motion, and the second gear is arranged at a position meshing with at least one of the rack gears. Characterize.

<Operation> The rack gear has endless teeth that are independent at a predetermined pitch along the axial direction around the outer peripheral surface of the rod-shaped base body, and the first gear is driven to rotate by a rotary drive source and at least the rack gear has at least one end. It meshes with one to give axial linear motion to the shaft, or axial rotary motion and axial linear motion, so it is possible to mesh the first gear from all directions around the external shaft. As well as the first
It is possible to obtain a rotary linear motion output device capable of rotating the shaft by driving the gear of (1) to cause the shaft to perform linear motion in the axial direction or while performing linear motion in the axial direction.

There are a plurality of rack gears, each of which is coaxially connected with a space therebetween, and the second gear is arranged at a position meshing with at least one of the rack gears. The second gear that meshes with the rack gear can be selected, and the second gear can be driven with a predetermined time lag determined by the amount of feed per unit time in the axial direction. Therefore, the second gear can be driven with a time lag that is determined by the amount of feed per unit time in the axial direction, and a rotary linear motion output device that can be used in a variety of applications that could not be considered with conventional rack gears. Can be obtained.

<Example> FIG. 1 is a front view of a shaft body used in a rotary linear motion output device according to the present invention. In this embodiment, a plurality of rack gears 71 to 73 formed of a group of endless teeth 5 formed independently along the axial direction Z at a predetermined pitch d ₁ are provided around the outer peripheral surface of the rod-shaped base body 4. The structure is such that they are coaxially connected with each other with a space D ₁ . The number of rack gears 71 to 73, the distance D ₁ between the rack gears 71 to 73, the number of endless teeth 5 constituting the rack gears 71 to 73, the pitch d ₁ of the endless teeth 5 and the outer diameter can be set arbitrarily. . Further, although the rack gears 71 to 73 are formed on the common base body 4 in this embodiment, they may be formed on different base bodies and then mounted and fixed on the same shaft.

FIG. 2 is a diagram showing an example of a rotary linear motion output device using the shaft body shown in FIG. 1, in which the rack gear 71 is engaged with the first gear 6 which is a pinion gear, and the positions where the rack gears 71 to 73 are engaged. The second gears 81 and 82 are rotatably mounted on the shaft. The second gear 82 meshes with the rack gear 73, but the second gear 81 is between the rack gear 71 and the rack gear 72 and has not meshed yet.

When the first gear 6 is rotated in the direction of arrow a ₁₁ ,
Due to the meshing of the gear 6 and the rack gear 71, the entire shaft body moves linearly in the axial direction Z ₁ . Due to this linear movement, the second gear 82 meshing with the rack gear 71 axially rotates in the direction of arrow b ₁ , and the rotational output is taken out.

On the other hand, in the initial state, the second gear 81 does not rotate because it does not mesh with any of the rack gears 71 to 73, but the meshing of the first gear 6 and the rack gear 71 causes the entire shaft body to move. When linearly moving in the axial direction Z ₁ , the rack gear 72 moves to a position where it meshes with the second gear 81, and the second gear 81 starts to rotate. The second gear 82 is disengaged from the rack gear 73 and stops rotating.

When the first gear 6 is rotated in the rotation direction a ₁₂ opposite to the rotation direction a ₁₁ , a linear motion in the opposite direction Z ₂ is given, and the second gear 82 meshes with the rack gear 73. The rotation starts in the reverse direction b ₂ . The second gear 81 is in the reverse direction b
After rotating to _2, it disengages from the rack gear 72 and stops rotating, and returns to the original state. When the shaft body is further moved in the axial direction Z ₂ , the second gear 81 meshes with the rack gear 71 and starts rotation. The second gear 82 disengages from the rack gear 73 and stops rotating.

The time for starting and stopping the rotation of the second gears 81, 82 is determined by the feed amount per unit time in the axial direction Z ₁ or Z ₂ due to the meshing of the first gear 6 and the rack gear 71. Therefore, it is possible to give the second gears 81, 82 a time lag operation that is determined by the feed amount per unit time due to meshing with the first rack gear 71.

If the shaft body is rotated in the direction of arrow a ₂₁ or a ₂₂ while the first gear 6 is still engaged, slippage occurs between the rack gear 71 and the first gear 6, and The body can be freely rotated about its axis. Moreover, the above-mentioned sliding action similarly occurs when the first gear 6 is axially rotated in the direction of the arrow a ₁₁ or a ₁₂ ; therefore, the first gear 6
While rotating the shaft in the direction of the arrow a ₁₁ or a ₁₂ , the shaft body can be rotated in the direction of the arrow a ₂₁ or a ₂₂ together with the linear movement in the axial direction Z ₁ or Z ₂ described above. It is possible.

Further, when a linear motion in the axial direction Z ₁ or Z _{2 is applied} to the shaft body, the rotary motion of the shaft body is converted into the rotary motion of the first gear 6 and the second gears 81 and 82. It Further, when the linear motion in the axial direction Z ₁ or Z ₂ and the axial rotary motion in the directions of the arrows a ₂₁ and a ₂₂ are simultaneously given to the shaft body, this rotary linear motion is the first gear. 6, second gear 8
Converted into rotational movements of 1,82. That is, not only reciprocating motion can be given to the shaft body from the first gear 6 side, but also the first gear 6 and the second gear 8 from the shaft body side.
It is possible to give a rotational movement also to 1, 82. Moreover, when a rotational linear motion is applied to the shaft body, the first gear 6 and the second gears 81 and 82 rotate due to the reciprocating motion of the shaft body. Sliding occurs with respect to the rotational movement of the shaft body. Therefore, it is possible to configure a kind of rotary filter that removes the rotary motion of the rotary linear motion given from the shaft.

In the present invention, since the teeth 5 of the rack gears 71 to 73 are endless, even if the axial rotation motion as described above is involved,
The meshing with the gear 6 and the second gears 81 and 82 is not impaired at all. Further, since the teeth 5 are endless, it is possible to mesh the second gears 81 and 82 from anywhere around the axis O.

FIG. 3 is a diagram showing another example of the rotary linear motion output device. The structural difference from FIG. 2 is that the first gear 6 made of a worm gear is meshed with the rack gear 71. In this case, the first gear 6 or the second gear 6 from the shaft side.
Except that the gears 81 and 82 cannot be operated.
The same effect as in the case of FIG. 2 is obtained.

FIG. 4 shows a front view of another embodiment of the shaft body according to the present invention. In this embodiment, the rack gears 71 to 73 are formed at intervals in half of the base body 4, and the gears 91 to 93 are coaxially connected to the other half at intervals D ₂ . . The gears 91 to 93 may be formed integrally with the base body 4 on which the rack gears 71 to 73 are formed, or a gear formed separately from the base body 4 may be attached with the base body 4 as an axis.

The advantage of the embodiment shown in FIG. 4 is that the gears 91 to 93 formed coaxially with the rack gears 71 to 73 can be used to impart rotary motion to the shaft body or draw out the rotary motion. The drawer can have a time lag, and it is easy to form a mechanism for converting the rotational movement of the shaft into its own linear movement or converting the linear movement into rotational movement. Examples are shown in FIGS. 5 and 6.

First, in the embodiment shown in FIG. 5, the first gear 61 is meshed with the rack gear 71, and the first gear 61 and
A gear 62 having teeth formed on the edge of the cylindrical body is integrally provided in a coaxial body, and the gear 63 is meshed with the gear 62.
A gear 64 coaxially connected to the gear 63 is meshed with a gear 91 on the shaft. Further, gears 141 to 143 are arranged so as to mesh with the gears 91 to 93.
In the illustrated state, the gear 141 is between the gear 91 and the gear 92 and does not mesh with any of the gears 91 to 93, but the gears 142 and 143 mesh with the gears 92 and 93, respectively.

When the shaft is rotated in the direction of the arrow a ₂₁ or a ₂₂ , the gear 64 meshing with the gear 91 rotates. The rotation of the gear 64 is transmitted from the gear 63 to the gear 62, and the first gear 61, which is integrally coaxial with the gear 62, rotates in the direction of arrow b ₁ . Since the first gear 61 meshes with the rack gear 71, rotation of the first gear 61 in the direction of arrow b ₁ causes the shaft body to make a linear motion in the direction of arrow Z ₁ . Contrary to the above, if the shaft is rotated in the direction of arrow a ₂₂ , the rotation direction of the first gear 61 is the direction of arrow b ₂ , so the shaft moves linearly in the direction of arrow Z _2. To do.
As a result, the second gears 81 and 82 perform the time lag operation on the rack gears 71 to 73 side. On the other hand, the gears 91 to 91
Also on the 93 side, the gears 141 to 14 with respect to the gears 91 to 93
A time lag occurs in the meshing of No. 3, and a similar time lag can be obtained.

Further, when a linear motion in the direction of arrow Z ₁ or Z ₂ is given to the shaft body, the first gear 61 meshed with the rack gear 71 rotates in the direction of arrow b ₁ or b ₂ , and this rotary motion is It is transmitted to the gear 91 of the shaft body by rotating the gear 62, the gear 63, and the gear 64. For this reason, the shaft is indicated by the arrow a _21.
Or rotate in the direction of a ₂₂ . And the arrow Z _{1 of the} shaft
Alternatively, in response to the linear movement in the Z ₂ direction, the second gear 8
The same time lag operation as described above is applied to the gears 1, 82 and the gears 141 to 143.

As is apparent from the above description, the first pinion gear
The gear 61, the gear 62, the gear 63, and the gear 64 are located between the rack gear 71 and the gear 91, and constitute a conversion device that performs mutual conversion between the rotational movement and the linear movement of the shaft body. Therefore, in order to perform the time lag operation, it is only necessary to rotate or linearly move the shaft body, so that the drive mechanism of the shaft body can be remarkably simplified.

Next, in the embodiment of FIG. 6, the first gear 6 is attached to the gear 91.
And a gear 11 having the same rotating shaft 10 are meshed with each other, and the gear 11 is rotationally driven by a drive source 12, a gear 13, and the like.

When the drive source 12 is operated, the shaft body rotates in the direction of arrow a ₂₁ or a ₂₂ due to the meshing of the gear 11 and the gear 13, and the first gear 6 moves in the axial direction Z ₁ or Z ₂ . Move in a straight line. Thereby, the rack gear 71
The second gears 81 and 82 perform a time lag operation on the ~ 73 side, and also on the gears 91 to 93 side, a time lag occurs in the meshing of the gears 141 to 143 with the gears 91 to 93,
A similar time lag operation is obtained.

In the above embodiment, a limited number of representative examples are shown, but it goes without saying that there are various other modified examples.

<Effects of the Invention> As described above, according to the present invention, the following effects can be obtained.

(a) It becomes possible to mesh the first gear from all directions around the axis of the shaft, and drive the first gear to cause the shaft to perform linear movement in the axial direction, or in the axial direction. It is possible to provide a rotary linear motion output device capable of rotating the shaft while performing the linear motion.

(b) The second gear can be driven with a time lag determined by the amount of feed per unit time in the axial direction, and a rotary linear motion output device capable of various applications that could not be considered with conventional rack gears. Can be provided.

[Brief description of drawings]

FIG. 1 is a front view of a shaft body used in the shaft body according to the present invention,
FIG. 2 is a diagram showing an example of a shaft body according to the present invention, FIG. 3 is a diagram showing another embodiment of the same, FIG. 4 is a front view showing another example of the shaft body, and FIG. FIG. 6 is a view showing a shaft body using the shaft body shown in the figure, FIG. 6 is a view showing another shaft body, FIG. 7 is a perspective view showing a conventional rack gear in use, and FIG. 8 is a conventional rack gear. Is a front view of FIG. 9 and FIG. 9 is a view showing a state of use thereof. 4 ... Base, 5 ... Endless tooth, 71-73 ... Rack gear

Claims (5)

[Claims] 1. A rotary linear motion output device including a rack gear, a first gear, and a second gear, wherein a plurality of the rack gears are provided, and each of the rack gears has an outer peripheral surface of a rod-shaped base. Has endless teeth independent of each other at a predetermined pitch along the axial direction, and is coaxially connected at intervals to form one shaft body, and the first gear is a rotary drive source. Is driven to rotate and meshes with at least one of the rack gears,
A shaft is provided with an axial linear motion, or an axial rotational motion and an axial linear motion, and the second gear is arranged at a position meshing with at least one of the rack gears. Characteristic rotary linear motion output device. 2. The rotary linear motion output device according to claim 1, wherein the plurality of rack gears are formed on a common base. 3. The rack gear according to claim 1, wherein the plurality of rack gears are formed on different bases, and the bases are attached and fixed to the same shaft. Rotational linear motion output device. 4. The rotary linear motion output device according to claim 1, further comprising a gear that is coaxial with the rack gear. 5. The rotary linear motion output device according to claim 4, wherein a plurality of the gears are provided at intervals.