JPH0410436Y2 - - Google Patents

Description

[Detailed explanation of the idea] B. Purpose of the invention [Industrial application field] The present invention relates to an automatic feed speed change mechanism for a polishing machine.

[Conventional technology]

The transmission mechanism of conventional power tools consists of an integrated transmission gear spline-fitted to an intermediate shaft, which is moved along the shaft by a transmission handle and meshed with a transmission pinion, thereby changing the gear ratio and changing the speed. A pair of transmission gears with different gears are rotatably fitted to an intermediate shaft via a key that is slidable in the axial direction, and meshed with a pair of pinions, respectively, and the transmission handle described above is By sliding the key, one transmission gear meshing with the protrusion of the key becomes integral with the intermediate shaft, transmitting rotation to the intermediate shaft, and selects the pair of transmission gears for the intermediate shaft. There are known devices in which the gear ratio is changed and the speed is changed by connecting the two.

However, according to the former method, if the pinion and gear do not match when changing gears, the tips of the gear teeth will hit each other and the gear will not shift smoothly.
It is difficult to switch during rotation, and if the switch is forced, the tips of the teeth may chip.

In addition, with the latter, there are problems such as the key cannot be moved unless it matches the key groove of each transmission gear, making it difficult to smoothly change gears, and making it impossible to change gears while the gear is rotating. .

[Problem that the invention attempts to solve]

Therefore, as a result of consideration in view of the above-mentioned conventional problems, the present invention eliminates the conventional means of connecting and releasing the intermediate shaft and a pair of transmission gears using a slide key, and externally mounts a pair of transmission clutches directly on the output shaft so that they can freely rotate. The output shaft is engaged with each intermediate gear and held in a predetermined position by a spring force, and the output shaft is directly slid and engaged with a clutch pin provided on the same axis to change the gear ratio and change the speed. With this structure, even if the positions of the clutch groove of the clutch and the clutch pin do not match, the clutch groove and the clutch pin can be easily connected, and the gear can be changed smoothly even when the output shaft is at an arbitrary angle. The purpose was to do so.

B. Structure of the invention [Means for solving the problem] That is, the present invention has an output shaft that automatically feeds the material to be polished through a feeding means, which is rotatably attached to a gear case, and which can be rotated in the axial direction through a positioning means. A clutch pin is fixed in the gear case of the output shaft, and a pair of clutches of different gears having clutch grooves that can be freely engaged and disengaged with the pin are loosely fitted to the left and right sides of the clutch pin. The above-mentioned problems have been solved by elastically biasing the intermediate gears and the springs interposed in each intermediate gear toward the clutch pin, thereby pressing the clutch pins against the gear guide and maintaining them at appropriate intervals.

〔Example〕

Below, the embodiments of the present invention will be described in detail based on the drawings. As shown in FIGS. 1 and 2, the output shaft 1 is
Oil metals 3, 3 are interposed on the side walls 2a, 23a of the gear case 2 and the base 23, so that the gear case 2 and the base 23 can be rotated freely in the direction around the axis, and in multiple stages in the axial direction (three stages in the drawing).
A positioning means 4 is inserted through the bed 23 so that the output shaft 1 can be operated by sliding. It is formed to automatically feed the polishing material fixing part 6 shown in FIG.

Also, in the gear case 2 of the output shaft 1,
A clutch pin 7 is passed through and fixed at a right angle to the axial direction approximately in the middle of the clutch pin 6.
A pair of clutches 8 and 9 having different numbers of teeth are loosely fitted on the left and right sides in the axial direction so as to be rotatable and slidable on the shaft.

The pair of clutches 8 and 9 are formed as gears having teeth carved on their outer peripheries, and third clutch grooves 10 and 11 are provided in their opposing parts to enable them to engage and disengage with the clutch pin 7. As clearly shown in the figure, they are recessed in a cross shape in a direction perpendicular to the shaft holes 8a and 9a, respectively.

Also, the gear guide 13 is fixed to the inner surface of one side wall 23a of the bed 23 with screws 12 or the like.
are provided in the axial direction, and the pair of clutches 8 and 9 are provided with springs 1 on both end surfaces of the gear guide 13.
The pair of clutches 8, 9 are held at an appropriate distance in the axial direction, and the output shaft 1 and the output shaft 1 are connected to the gear case 2. The intermediate gears 17 and 18 of the intermediate shaft 16 installed in parallel are meshed with each other.

Here, each of the springs 14 and 15 is mounted on the output shaft 1, and one end thereof is connected to each of the clutches 8 and 9.
A pair of clutches 8, 9 are supported by thrust washers 19 interposed on the outer surfaces of the clutch pins 7, and the other end is supported by the gear case 2, the side walls 2a, 23a of the bed 23, or the oil metals 3, 3, etc. The gear guide 13 is elastically biased in the direction, thereby being pressed against both end surfaces of the gear guide 13.

Further, as the positioning means 4 for the output shaft 1,
As shown in the illustrated example, three grooves 4a, 4 are provided on the outer peripheral surface of the output shaft 1 at predetermined intervals in the axial direction.
b, 4c, and a screw hole 4 that penetrates the side wall 2a of the gear case 2 and is arranged at right angles to the output shaft 1.
After inserting the steel ball 4e and spring 4f into d, screw the adjustment screw 4g, and the steel ball 4e is pushed out by the spring 4f and selectively engages with one of the grooves 4a, 4b, 4c. For example, one that is formed so as to position the output shaft 1 in the axial direction by adjusting the position of the output shaft 1 is used.

Here, the intervals between the grooves 4a, 4b, 4c are determined by the distance between the clutch pin 7 and the pair of clutches 8, 4c.
It goes without saying that the dimensions of the clutch grooves 10 and 11 at 9 are made to match.

Further, one of the intermediate gears 17, 18, in the illustrated example, the intermediate gear 17 is meshed with a shafted pinion 20 installed in the gear case 2, and the shafted pinion 20 has an intermediate gear 21 on its shaft 20a. It is interlocked with the motor 22 by meshing with a pinion 22a fixedly provided on the shaft of the motor 22.

Further, one end of the output shaft 1 is rotatably supported by a bed 23 shown in FIG. The handle 24 is mounted on the exterior via a handle fixing means (not shown) so that the handle 24 can be moved in the axial direction.
is rotatably supported by the bed 23 so as not to move in the axial direction.

Therefore, the output shaft 1 is slidable in the axial direction with respect to the handle 24, and the clutch pin 7 is fixed by the handle fixing means as shown in FIG.
Output shaft 1 and handle 2 only when in the neutral position
4 is provided so as to be fixed in the direction around the axis.

Further, the gear change is performed by a suitable switching means, and the switching means in the illustrated example has two knobs 25 and 26 provided independently at the end of the output shaft 1 projecting outward from the handle 24. They are movable together in the axial direction, one of which is fixed to the output shaft 1,
The other is formed by being externally covered via a sliding and fixing means so that it engages with the output shaft 1 after sliding a predetermined stroke in the axial direction.

Note that in FIGS. 1 and 2, 27 indicates a snap spring fixed to the other end of the output shaft 1, and in FIG. It shows. In addition, 30 is a polishing part support stand.

In the above configuration, FIG. 1 shows a neutral position where the clutch pin 7 is located between the pair of clutches 8 and 9 and does not mesh with either of them. In this neutral position, the rotational force of the motor 22 is It is transmitted to both clutches 8, 9 via a shaft pinion 20 and intermediate gears 17, 18, both clutches 8, 9 are idled on the shaft, and the output shaft 1 is held stationary.

From the neutral position, when the output shaft 1 is slid to the right in FIG. 1 by the arbitrarily configured speed change switching means and the clutch pin 7 is moved, the pin 7 engages the clutch of the clutch 9 as shown in FIG. It meshes with the groove 11, is connected to the output shaft 1, and is switched to a low speed position. At this time, the groove 4 of the positioning means 4
Since the steel ball 4e is engaged with the steel ball 4e, the above-mentioned low speed position is maintained.

Furthermore, when the output shaft 1 is slid leftward in the figure from the low speed position and the clutch pin 7 is moved, the connection with the clutch 9 is released, and then the clutch groove 10 of the other clutch 8 passes through the neutral position. The clutch 8 and the output shaft 1 are engaged, and the clutch 8 and the output shaft 1 are connected and switched to the high speed position shown by the two-dot broken line in FIG. At this time, the groove 4c of the positioning means 4 and the steel ball 4e are engaged with each other, so that the high speed position is maintained.

Therefore, in the low speed position, the output shaft 1 is interlocked with the motor 22 via the clutch 9, the intermediate gear 18, the intermediate shaft 16, the intermediate gear 17, and the shafted pinion 20, while in the high speed position, the clutch 8, The output shaft 1 and the motor 22 are interlocked via the intermediate gear 17 and the pinion 20 with a shaft.

Further, when shifting to the low speed position or the high speed position, if the positions of the clutch grooves 11, 10 and the clutch pin 7 are misaligned, the clutch pin 7 causes the clutch 9 or 8 to be moved by the springs 15, 14. However, when each clutch 8, 9 is driven and rotated by the motor 22, each clutch groove 11 or 10 coincides with the clutch pin 7 and is immediately engaged. , when engaged, each clutch 9, 8 is returned to its original position by the spring 15 or 14, and the above-mentioned engagement is carried out more reliably.

Further, in the above-mentioned low speed position, the other clutch 8 is rotated but is free with respect to the output shaft 1. Further, in the above-mentioned high speed position, one clutch 9 is rotated but is free with respect to the output shaft 1.

[Effect of idea]

As explained above, since the speed change mechanism of the polishing machine according to the present invention is configured, the pair of clutches 8 and 9 are always maintained in a state of meshing with the intermediate gears 17 and 18, and in this state, the output shaft 1 is slid in the axial direction and the clutch pin 7 fixed to the coaxial 1 is inserted into the clutch groove 10 or 11 of each clutch 8, 9.
Because it engages with the gear and switches to high or low speed,
Unlike conventional gear shifting that changes gears, the tips of the gear teeth are not damaged during engagement, and if the clutch pin 7 and the clutch grooves 10, 11 do not match, the clutch pin 7 allows each clutch 8, 9 is pressed and moved in the axial direction, but each clutch 8, 9 is elastically biased by springs 14, 15, respectively, in the direction of meshing with the clutch pin 7, so each clutch 8, 9 is rotated by the motor 22. Then, each clutch groove 10, 11 is connected to the clutch pin 7.
, and are immediately engaged by the spring force, so even if the output shaft has an arbitrary shaft angle, the speed change can be easily and smoothly performed.
The clutches 8 and 9 are held at each gear position by means of springs 14 and 1, respectively.
5 applies a resilient force in the direction of meshing with the clutch pin 7, making it easy to change gears, yet each gear position can be reliably maintained, and furthermore, the output shaft 1 and clutch 8,9
The connecting part structure has clutch grooves 10, 1 that are easy to process.
1 and a clutch pin 7, which is extremely simple, so it is easier to manufacture and can be provided at a lower cost than the conventional one in which a shaft and clutch are provided with a key groove and a slide key is fitted. The practical effects are enormous.

[Brief explanation of drawings]

1 and 2 are a vertical side view in a neutral position and a vertical side view in a low speed position, respectively, showing an embodiment of the speed change mechanism of a polishing machine according to the present invention, and FIG. 3 is a longitudinal side view of the clutch in the same embodiment. 4 is a front view of a polishing machine equipped with the same embodiment. 1... Output shaft, 2... Gear case, 4... Positioning means, 5... Feeding means, 7... Clutch pin, 8, 9... Clutch, 10, 11... Clutch groove, 13... Gear guide, 14, 15... Spring, 17, 18... Intermediate gear.

Claims (1)

[Scope of utility model registration request] An output shaft 1 for automatically feeding the material to be polished via a feeding means 5 is installed in a gear case 2 so as to be rotatable and to be slidable in multiple stages in the axial direction via a positioning means 4. A clutch pin 7 is fixed in the gear case, and clutch mechanisms 10, 11 that can be freely engaged and disengaged from the clutch pin 7 are provided on both the left and right sides of the clutch pin 7.
A pair of clutches 8 and 9 having different numbers of teeth are loosely fitted and engaged with the intermediate gears 17 and 18, respectively, and each clutch is elastically biased toward the clutch pin by the intervening springs 14 and 15, respectively. A speed change mechanism for a polishing disk characterized in that it is pressed against a gear guide 13 and maintained at an appropriate interval.