JPH034785B2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field)
This invention relates to a gear mechanism capable of performing disengagement.

(Prior Art) During operation, there are many cases where it is necessary to transmit rotation only at a specific position or timing.

Conventionally, as a gear mechanism that transmits rotation intermittently, for example, an intermittent gear mechanism is well known as an example of meshing gears that have a notch in a part and do not have a continuous tooth row (see Mechanical Design Reference). etc). In this case, the distance between the axes of the pair of gears must be fixed, and it is impossible to remove one gear from the locking device and set it free.

Further, as a gear device in which a gear train is engaged and disengaged during operation, a variable speed gear device widely used in automobiles and other devices is known.
This is a circular gear in which both the pinion and gear have infinite tooth rows, that is, they have a finite diameter.In addition to allowing either the pinion or the gear to move in the axial direction, the edges in the width direction of the teeth are chamfered. The tooth thickness has been narrowed by modification. Then, when the pinion and gear are in a rotating state with approximately similar circumferential speeds, either the pinion or the gear is moved in the axial direction and pushed in using the space of the thinner tooth thickness mentioned above. This is to engage the object. This method assumes that the gears are allowed to move in the axial direction, but is similar to the above-mentioned intermittent gear mechanism in that the distance between the axes of the pair of gears to be engaged and disengaged must be constant. be.

(Problems to be Solved by the Invention) This invention provides a gear mechanism in which the rack part can be freely engaged with the pinion which is disengaged and is in a completely free state while the rack part is rotating or moving. It is an attempt to obtain.

Structure of the Invention (Means for Solving Problems) A removable gear mechanism of the present invention is a removable gear mechanism having a rack and a pinion that relatively move within a gear surface to engage and disengage. , the rack consists of a main body rack and an introduction segment rack disposed adjacent to the longitudinal end of the main body rack on the side into which the pinion enters, a. The connecting end of the introduction segment rack with the main body rack is: The pitch line in the tooth depth direction of the main body rack and the pitch line in the tooth depth direction of the lead-in segment rack are aligned, b) The notch dimension at the connection part is positioned so as to be the regular dimension, c) The pinion lead-in segment rack The pitch line in the tooth depth direction of the side end portion is at least twice the height of the end of the tooth, and is lower than the height of the pitch line in the tooth depth direction of the main body rack, and (d) the connection point with the main rack is the center of rotation. , the other end of the introduction segment rack is swingably supported, and the pitch line at the end of the pinion introduction side is configured to retreat and return in the dedendum direction based on the above-mentioned initial position, and furthermore, e introduction segment The rack is characterized in that it is supported so as to be longitudinally displaceable and returnable within a range of 1/2 of the pitch of the teeth.

Furthermore, adjacent to the longitudinal end of the rack main body on the side where the pinion gear enters, the rack is disposed so as to be engaged with and disengaged from the pinion only in a part of the movement path of the pinion gear. A run-up means is provided for pre-applying rotation at a speed close to the rotational speed obtained when engaged with the pinion rack.

(Example) Embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a sectional view of the pinion portion thereof.

In this embodiment, the pinion rows 3A, 3B, 3C, etc. installed on the conveyor means 2 can be moved widely beyond the range of the rack consisting of the main body rack 1 and the introduction segment rack (hereinafter simply referred to as segment rack) 7. As the conveyor moves, it moves from right to left in FIG. 1 and is configured to successively engage with the main body rack 1.

The main body rack 1 is fixed to the machine main body frame 4 with pins 5 and 6, and on the pinion introduction side thereof, an introduction segment rack 7 is provided in contact with the main body rack 1 so as to be able to swing up and down about the pin 6 as an axis. ing. At the joining point 8, the pitch line 13 in the tooth depth direction of the main rack 1 and the pitch line 11 in the tooth depth direction of the segment rack 7 match, and the notched pitch 9 has a dimension equal to the notched pitch 10 of the regular rack part. It is arranged like this. Further, at the other end of the segment rack 7, that is, the pinion introduction side end 7B, the pitch line 11 in the tooth depth direction is connected to the main body rack 1 by a dimension 12 that is at least twice the height of the tooth tip.
It is held so that it is lower than the pitch line 13 in the tooth depth direction. In this embodiment, a block 15 is assembled integrally with the segment rack 7.
However, the above dimension 12 is maintained by being pressed against the pin 14 by the upward force of the spring 16.

Further, the distance 20 between the end face of the pinion introduction side end 7B of the segment rack 7 and the locking pin 14 is set to within 1/2 of the pitch of the teeth. By making the rack 7 freely displaceable and returnable in the longitudinal direction, the force generated on the tooth surface when the pinion 3 and the segment rack 7 engage is absorbed by the movement of the segment rack 7.

Furthermore, drive ring 1 is coaxial with pinion 3.
8 is fixed, and on the other hand, a run-up rail 19 that contacts this drive ring 18 is installed on the pinion 3 introduction side of the segment rack 7, and before contacting the segment rack 7, the pinion 3 is made to Rotation is applied in advance to minimize the relative speed.

The gear mechanism configured in this manner operates as follows.

When the pinion 3B advances from the right in Fig. 1 and reaches the segment rack 7, it starts to mesh at a position where the teeth of the pinion 3 and the valley of the segment rack 7 coincidentally coincide, as shown in Fig. 3. If so, the pinion 3 and the rack 7 will naturally mesh, and as the pinion advances, the mesh will gradually become deeper, and when it is introduced into the main body rack part 1,
A normal meshing state can be obtained. In such an engaged state, the same effect can be achieved even if the segment rack 7 is not provided and the segment rack 7 is directly introduced into the main body rack 1.

However, this is a coincidence, and in general,
If the tips of the teeth interfere with each other as shown in Figures 4 and 7, and either pinion 3 or rack 7 cannot escape, it is obvious that the tooth will be destroyed, as shown in Figure 7. Therefore, it is not possible to directly introduce the pinion 3 into the main body rack 7.

In the present invention, even in such a state, the segment rack 7 swings downward about the shaft 6 by the interference of the tooth tips, thereby preventing the teeth from breaking. At the same time, the pinion 3 is rotated by the contact between the tooth tips.
As shown in Figure 5, the rack 7 and pinion 3 have the same notch pitch but different tooth tip pitches, so as they roll, one tooth tip and one trough come together, and from that point on, Both teeth will engage. As the teeth engage, the rack 7, which had been pushed down, is returned to its original position by the spring 16. From then on, as shown in Fig. 3, the mesh is gradually deepened and introduced into the main body rack, resulting in a normal mesh state. can be obtained.

The force generated on the tooth surface when the segment rack 7 and pinion 3 engage is absorbed by the longitudinal movement of the segment rack 7, and the segment rack 7 returns naturally immediately after engagement, resulting in smoother engagement. can get.

When the relative running speed between the pinion 3 and the segment rack 7 is small, the above-mentioned configuration alone is sufficient. However, when the relative running speed increases, the length of the segment rack must be made very long if meshing is to be achieved only by the phase change of the tooth tips due to natural rolling as described above.

In contrast, in this embodiment, the segment rack 7 is shortened to a practical extent by the drive ring 18 and the run-up rail 19 in contact with the drive ring 18.
That is, in FIG. 1, when the free pinion 3C is moved by the conveyor and reaches the position of the run-up rail 19, the drive ring 18 contacts the run-up rail 19 and rolls on it, giving rotation to the pinion. If the diameter of the drive ring 18 is made equal to the pitch diameter of the pinion, when the tips of the pinion teeth and the tips of the segment racks begin to engage, the pitch of the tips of the pinion teeth is larger than the pitch of the teeth of the rack. As described above, finding a point where engagement is possible while shifting the phase is as described above, but since the pinion is accurately rotated prior to engagement, operation is ensured even at high speeds.

Also, if the diameter of the drive ring 18 is larger than the pitch circle of the pinion, the pinion tooth tip phase approaches the rack with a delay, and conversely, if the diameter of the drive ring 18 is smaller than the pitch circle of the pinion, the pinion The tooth tip phase advances against the ease as it approaches. In either case, the traveling distance from when the tooth tips of the pinion and rack begin to engage to when they enter the meshing state can be extremely shortened, and the rotational speed of the pinion, which is determined by the diameter of the drive ring 18, can be maintained at a normal speed. It is best to set the rotation speed between ±50% of the rotational speed obtained when the pinion engages. Note that if the run-up rail 19 is set to a length just before the pinion and segment rack begin to engage, and is arranged so that the drive ring and the rail are no longer in contact after the engagement begins, wear and tear on each member can be avoided. It can be prevented.

In the above embodiment, the case is shown in which the main body rack 1 is a straight line, but of course the rack does not have to be a straight line, and may be a circular gear with a finite diameter, or may have a free curved pitch. It may also be a deformable rack or an internal gear.

FIG. 8 shows an embodiment in which the main body rack 1 is a part of a circular gear having a finite diameter, and the same parts as in the previous embodiment are given the same reference numerals. In this embodiment, the segment racks 7 are provided on both sides of the main body rack 1, and are configured to be used for rotation in both forward and reverse directions.

A case will be shown in which such a removable gear mechanism is applied to a printing and baking device for canned goods. In particular, when printing and baking cans using ultraviolet curing paint, the cans are conveyed by conveyor means between the printing machine and the curing and baking equipment.Each of the printing machines and the curing and baking equipment uses gears to give a predetermined rotation. Previously, the use of drive mechanisms required racks to be placed along the entire length of the conveyor. When the detachable gear mechanism of the present invention is applied to an ultraviolet curing baking device, as shown in FIG. engages and provides accurate rotation. FIG. 9 shows an application to an external coating printing machine prior to this, in which the pinion 3 engages the main body rack 1 only in the required range before and after the printing station 24, thereby providing the necessary accurate rotation. In this example, the body rack 1 is shaped to follow the curved trajectory 25 of the printing station 24. If such a coating printing machine and curing/baking device are used, the racks need only be installed in the necessary ranges of both stations, resulting in great effects such as greatly increasing the degree of freedom in the arrangement of equipment.

Effects of the Invention Since the detachable gear mechanism of the present invention is configured as described above, it exhibits the following special effects compared to conventional mechanisms.

The pinion introduction side end of the introduction segment rack has a pitch line in the tooth depth direction that is at least twice the height of the tooth tip and is lower than the height of the pitch line in the tooth depth direction of the main body rack. There is no interference between the teeth at the end, allowing for shock-free introduction.

Furthermore, even if the pinion and the introduction segment rack are in a phase where the tips of the teeth interfere with each other when the pinion is introduced into the introduction segment rack, the introduction segment rack is tilted in advance, so as the pinion advances, the tooth tips will starts to interfere little by little, and the introduction segment rack rotates back toward the bottom of the tooth by that amount using the connection point with main rack 1 as a fulcrum, and from the moment it escapes interference, light engagement begins, and accordingly, Since the introduction segment rack returns to its original position, accurate engagement is possible without impact.

Furthermore, since the lead-in segment rack is displaceable in the longitudinal direction, if the phase is shifted from the normal meshing state and force is applied in the advancing direction to the meshing tooth surfaces, that force can be released. It is possible to prevent excessive force from being applied to the tooth surfaces, and it is also possible to shift the meshing of the teeth to a more complete state.

In addition, since the lead-in segment rack itself does not require bending, the lead-in segment rack can be made of a highly rigid material such as steel, and there is no load capacity limit, and it can be applied to mechanisms subject to high loads. The scope of use can be greatly expanded.

Furthermore, according to the invention described in the second claim, the pinion can be rotated close to a predetermined number of rotations before the pinion and the introducing segment rack start to mesh with each other, so that the pinion and the rack are in the meshed state. The traveling distance until the pinion engages can be extremely shortened, making it possible to increase the speed, and since the start of the rotational movement of the pinion does not depend on the frictional contact of the tooth tips, wear and tear on the rack can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of one embodiment of the detachable gear mechanism of the present invention, Fig. 2 is a sectional view of its pinion section, Figs. 3 to 7 are explanatory diagrams of its operation, and Fig. 8 is FIG. 9 is a conceptual diagram of the configuration of another example of its application. 1: Main body rack, 2: Conveyor means, 3: Pinion, 4: Frame structure, 5, 6: Pin, 7:
Introduction segment rack, 9, 10: notch pitch,
14: pin, 16, 17: spring, 15: block, 18: drive ring, 19: run-up rail, 21: container holding device, 22: container, 23: baking device, 24: printing station, 25: printing station 24 curved trajectory.

Claims (1)

[Scope of Claims] 1. A gear mechanism capable of engaging and disengaging, having a rack and a pinion that relatively move within a gear plane to engage and disengage, the rack being a main body rack and a pinion of the main body rack entering the gear mechanism. an introduction segment rack disposed adjacent to the longitudinal end of the side, a. The connection end of the introduction segment rack with the main body rack is located between the pitch line in the tooth depth direction of the main body rack and the tooth depth direction of the introduction segment rack. b) The pinion introduction side end of the introduction segment rack is positioned so that the pitch line in the tooth depth direction is at least the same as the height of the tooth tip. d) The other end of the lead-in segment rack is swingably supported with the connection point with the main body rack as the center of rotation, and the pinion The pitch line at the lead-in end is designed to retreat and return in the tooth root direction with respect to the above-mentioned initial position as a reference, and the lead-in segment rack is longitudinally extended within 1/2 of the notch pitch of the teeth. What is claimed is: 1. A removable gear mechanism characterized in that the gear mechanism is supported so as to be able to be displaced and returned in a direction. 2 A gear mechanism having a rack and a pinion that move relatively within a gear plane, in which a rack that engages with the pinion is disposed only in a part of the movement path of the pinion, and the pinion of the rack The introduction part is configured such that its pitch line in the tooth depth direction is lower than the height of the pitch line in the tooth depth direction of the main rack, and at the longitudinal end of the main rack on the side where the pinion enters, Adjacent to this,
A removable gear mechanism characterized in that a run-up means is arranged to preliminarily provide a rotation speed close to the rotation speed obtained when the pinion is engaged with the pinion. 3. The engagement and disengagement according to claim 2, wherein the rotation given in advance by the run-up means is within a range of ±50% of the rotational speed obtained when the pinion is engaged with the pinion. Possible gear mechanism.