JPH0260460B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a positioning mechanism for a very thin round bar.

[Prior Art and Problems to be Solved by the Invention] In the processing of ultra-fine round bars, such as needles and shafts of small motors, it is required to position and clamp materials continuously, quickly, and with high precision. has been done.

Previously, the utility model registration number pertaining to the applicant was
As disclosed in No. 1438250, etc., a V block was used as a clamping mechanism to position and fix the round bars individually. However, in this positioning and fixing method, a stable clamp is obtained, but it takes time to attach and detach the material.

Additionally, there have been devices that use a collection chuck for clamping, but it has not been possible to do this continuously in a short period of time. In other words, it takes time to set the materials one by one, and
This is because the rod is extremely thin and requires accurate positioning.

Furthermore, it is conceivable to have a device in which rod holding grooves are drilled at equal intervals in the cylinder, the materials are sequentially loaded, the grooves are rotated at a certain angle using an indexing device, etc., and the rods are fixed in the processing section. It is very difficult to cut grooves accurately.

In general, even the highest grade angle indexing devices that cost hundreds of thousands of yen to millions of yen have an error of about ±15". Therefore, if a cylinder is 200φ, 100mm x tan15" = 7.3μm, that is, the cylinder ±7.3μm just by indexing the angle upwards
There will be some degree of error. When V-grooving is performed on this, a machining accuracy of approximately ±3 μm must be considered, and the final accuracy must be considered to be approximately ±10.3 μm.

This is not only insufficient for processing ultra-thin round bars, but also extremely expensive, making it economically impractical.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an inexpensive and highly accurate positioning mechanism that can easily, quickly, and accurately position and fix an ultra-thin round bar.

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a bar mounting roller and a positioning roller having a larger diameter than the bar mounting roller coaxially and integrally, and A plurality of V-shaped cross-section bar mounting grooves and a plurality of V-shaped cross-section positioning grooves are provided at intervals in the circumferential direction on the outer peripheral edge of the roller and the outer peripheral edge of the positioning roller, respectively. The rod mounting grooves and the corresponding positioning grooves are located on the same straight line parallel to the axis of the roller so that the bottom side of the positioning groove is the same distance from the axis of the roller. A positioning tool is formed to have the same cross-sectional shape as the groove and engages with the positioning groove to accurately position the positioning groove in the direction of rotation of the roller. A rod pressing tool for pressing a rod placed in the rod placement groove corresponding to the positioning groove to be engaged with the tool, provided opposite to the outer periphery of the rod placement roller. This provides a positioning mechanism for ultra-thin round rods.

[Operation and Effect] In the ultra-fine round bar positioning mechanism having the above configuration, each bar placement groove on the outer periphery of the bar placement roller and the corresponding positioning groove on the outer periphery of the bar positioning roller are cut using a milling cutter or the like. Since both grooves can be cut at the same time, both grooves can be formed easily and with high precision at the same angular position in the rotational direction of the roller. Therefore, by engaging the positioning tool with the positioning groove of the positioning roller for accurate positioning, the rod placement groove of the rod placement roller can also be accurately positioned at the same rotational position at the same time.

In addition, the rod mounting grooves and positioning grooves having a V-shaped cross section are arranged so that their groove bottoms are located at equal distances from the roller axis, and each rod mounting groove and its corresponding positioning groove are arranged so that the groove bottoms are located at equal distances from the roller axis. The positioning roller and the rod mounting roller having a larger diameter are formed respectively so that the groove bottom side of the positioning groove has the same cross-sectional shape as the rod mounting groove. Therefore, the opening width of the positioning groove at the outer periphery of the positioning roller is larger than the opening width of the rod placement groove at the outer periphery of the rod placement roller. Therefore, even if the rod placement groove of the rod placement roller is a small groove suitable for engagement and placement of a very thin round rod, the positioning groove must have a larger opening groove than the rod placement groove. Therefore, even if there is some variation in the stop position of the positioning groove with respect to the positioning tool, the positioning tool can smoothly enter the positioning groove, and the positioning and fixing operation of the positioning groove can be performed reliably. Become. On the other hand, since the rod placement groove is a shallow groove smaller than the positioning groove, the ultra-thin round rod can be easily pressed and fixed in the rod placement groove using a rod pressing tool.

Therefore, according to the present invention, it is possible to provide an inexpensive and highly accurate positioning mechanism that can quickly, easily, and accurately position and fix an extremely thin round bar.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 5 show one embodiment of the present invention. First, referring to FIG. 1, the positioning mechanism includes a bar mounting roller 1, a positioning roller 2 having a larger diameter than the bar mounting roller 1, a bar pressing tool 3,
It consists of a positioning tool 4 and a shaft 5.

The bar mounting roller 1 and the positioning roller 2 are formed coaxially and integrally with each other. More specifically, in this embodiment, the bar mounting roller 1 integrated with the positioning roller 2 has three roller portions 1a, 1b, and 1c having the same diameter and spaced apart from each other in the axial direction. 1b and 1c are coaxially and integrally formed via shaft portions 1d and 1e having a smaller diameter than the roller portion. Both of these integral rollers 1 and 2 are also fixed coaxially to the shaft 5 or are integrally formed therewith. The shaft 5 is rotatably supported by a bearing 11 and connected to a rotation drive means (not shown).

A plurality of bar mounting grooves 6, 6a, 6b, . A plurality of positioning grooves 7, 7a, 7b, .

As can be seen from FIG. 2 and FIG.
The rod mounting grooves 6 and the corresponding positioning grooves 7 are located on the same straight line parallel to the axes of the rollers 1 and 2. Therefore, the groove bottom of each rod mounting groove 6 and the groove bottom of the corresponding positioning groove 7 are on the same straight line.

The groove bottom side of the positioning groove 7 having a V-shaped cross section has the same cross-sectional shape as the rod mounting groove 6, and
Since the positioning groove 7 is formed on the outer circumferential edge of the positioning roller 2, which has a larger diameter than the bar mounting roller 1, as can be easily seen from FIG. is larger than the opening width of the rod placement groove 6 at the outer peripheral edge of the rod placement roller 1.

The groove angle of the rod mounting groove 6, which has a V-shaped cross section, is stable at about 60 degrees, and the groove depth has been experimentally determined from the rod mounting groove 6 to the rod diameter, as shown in Fig. 3. 5-20
It was good that approximately % of the rod protruded outward from the rod mounting groove 6 in the radial direction.

As mentioned above, the bottoms of the rod mounting groove 6 and the positioning groove 7 must all be located at the same distance r from the axes of the rollers 1 and 2. The circumferential intervals do not need to be equal intervals.

Referring to FIGS. 1 and 4, positioning tool 4
is for accurately positioning the positioning groove 7 in the roller rotation direction by engaging with the positioning groove 7 of the positioning roller 2, and this positioning tool 4 is arranged opposite to the outer periphery of the positioning roller 2. has been done.

More specifically, as shown in FIG. 4, the positioning tool 4 includes a fixed piece 9 fixed at a predetermined position relative to the positioning roller 2, and
An arrow 8 that can slide in the radial direction, especially in the vertical direction, of the positioning roller 2 along the sliding surface 9a, and a spring 12
and a pressing piece 10 that presses the arrow 8 against the sliding surface 9a of the fixed piece 9 with a force of . The arrow 8 can be reciprocated in the radial direction of the roller, particularly in the vertical direction, by a lever (not shown).

It is desirable that the arrow 8 has a tapered shape similar to the cross-sectional shape of the positioning groove 7, and its tip 8a is rounded.

Referring to FIGS. 1 and 5, the bar pressing tool 3
is for pressing the ultra-thin round rod 15 mounted in the rod mounting groove 6 against the rod mounting groove 6 corresponding to the positioning groove 7 that is engaged with the arrow 8 of the positioning tool 4, This bar pressing tool 3 is arranged opposite to the outer periphery of the bar mounting roller 1.

To explain in more detail, here, the bar pressing tool 3
is equipped with a pressing piece 3a configured to be reciprocated in the radial direction of the bar mounting roller 1, particularly in the vertical direction, by a lever or the like (not shown), and the positioning tool 4
When the positioning tool 4 is raised, the pressing pieces 3a are raised at the same time, and when the positioning tool 4 is lowered, the pressing pieces 3a are lowered almost simultaneously. However, when descending, the positioning tool 4 descends somewhat quickly to position and fix the positioning roller 2 integrated with the bar placement roller 1, and then the pressing piece 3a descends to remove the ultra-fine round bar in the bar placement groove 6. 15 is preferably press-fixed into the rod mounting groove 6.

As shown in FIG. 5, a rod supply device 13 is located on the left side of the rod mounting roller 1 rotating clockwise in the figure.
A bar discharge rail 14 is provided on the right side of the bar mounting roller 1.

A large number of extremely thin round rods 15 stored in the rod supply device 13 are installed in the rod mounting groove 6 one by one by natural falling. Then, as the rod placement roller 1 is rotated clockwise together with the positioning roller 2, the ultra-thin round rod 15 in the rod placement groove 6 is moved to the rod pressing tool 3.
The pressing piece 3a moves toward the position directly below the pressing piece 3a. When the rod placement groove 6 in which the ultra-thin round rod 15 is mounted reaches almost directly below the rod pressing tool 3, the positioning groove 7 on the extension line of this rod placement groove 6, that is, corresponding to the groove 6, is also a positioning tool. It reaches almost directly below arrow 8 of 4. At this time, the rotation of rollers 1 and 2 is stopped,
The rollers 1 and 2 are disengaged from the engagement of, for example, a ratchet (not shown) and are free to rotate. After that, the arrow 8 of the positioning tool 4 descends and the positioning groove 7
By engaging with the rollers 1 and 2, the rollers 1 and 2 are accurately positioned and fixed, and then the pressing piece 3a of the bar pressing tool 3
descends and presses and fixes the ultra-thin round rod 15 in the rod placement groove 6.

The ultra-thin round rod 15 fixed in this way has
End chamfering, cutting off, drilling, lapping, grooving, chamfering of holes, etc. are performed using tools.

When the processing of the ultra-fine round bar 15 is completed, the pressing piece 3a
Then, the arrow 8 rises, and the rollers 1 and 2 rotate clockwise in FIG. 5 again. As a result, the next rod mounting groove 6 is moved to a position almost directly below the pressing piece 3a of the rod pressing tool 3. On the other hand, the processed ultra-thin round rod 15 is discharged onto the rod discharge rail 14 when the rod mounting groove 6 moves to a predetermined position.

In the ultra-fine round bar positioning mechanism having the above configuration, each bar mounting groove 6 and the corresponding positioning groove 7 can be cut simultaneously with a milling cutter or the like, so both grooves 6 and 7 can be cut by the roller 1. ,2
can be easily and precisely formed at the same angular position in the rotational direction. As mentioned at the beginning, in the case of a positioning method using a conventional indexing device, a positioning error of about ±10.3 μm is unavoidable, and the device is very expensive. However, in the above embodiment device according to the present invention, Since the rod mounting groove 6 having a V-shaped cross section and the corresponding positioning groove 7 can be simultaneously machined on the integrated rollers 1 and 2, it is only necessary to consider the accuracy of V-groove machining.
If machine tools with the same accuracy are used, 3~
It is possible to keep the error within 4μm, and
The device can be manufactured at 1/10 to 1/100 the cost of using an index device.

Furthermore, since the positioning roller 2 has a larger diameter than the rod mounting roller 1, the opening width of the positioning groove 7 at the outer periphery of the roller 2 is equal to the opening width of the rod mounting groove 6 at the outer periphery of the roller 1, as described above. becomes larger than Therefore, the rollers 1,
When the rotation of the rollers 1 and 2 is stopped in order to position and fix the rollers 2, it is possible to have a relatively large error in the rotation stop position.

That is, as shown in FIG.
The opening width of the bar mounting groove 6 is d(d
<<D) If you try to engage the positioning arrow directly with the bar mounting groove 6, in order for the arrow to enter the bar mounting groove 6 without any hindrance, it is necessary to The center of the groove 6 is ±d/ with respect to the center of the tip of the arrow.
However, when the arrow 8 of the positioning tool 4 is engaged with the positioning groove 7, which has a larger opening width than the rod mounting groove 6,
The center of the positioning groove 7 is ± with respect to the center of the tip of the arrow 8.
If the deviation is within D/2, the arrow 8 of the positioning tool 4 will engage in the positioning groove 7 without any problem, and the arrow 8 of the positioning tool 4 will engage with the positioning groove 7. As a result, the rollers 1 and 2 are positioned and fixed at correct positions.

In this way, the rollers 1 and 2 can be positioned using the positioning groove 7, which has an opening width wider than the rod mounting groove 6, so that the rotation of the rollers 1 and 2 can be stopped using the positioning tool. 4 arrow 8
The width that can be corrected (that is, the ability to correct the position) is increased by the engagement of the above. Therefore, the rollers 1 and 2 can be positioned and fixed with high accuracy without requiring high positional accuracy to stop the rotation of the rollers 1 and 2, and the rotational drive system can be constructed at low cost.

In addition, since the arrow 8 of the positioning tool 4 is engaged with the positioning groove 7 which is wider than the rod placement groove 6, the contact area with the inner surface of the groove is increased compared to the case where the arrow 8 is engaged with the rod placement groove 6. can do. Therefore, stable positioning accuracy can be obtained and the service life can be extended.

In the embodiment shown in FIG. 3, the rod mounting groove 6 and the corresponding positioning groove 7 have a V-shape with a constant groove angle from the groove bottom to the opening. The groove bottom side of the positioning groove 7 having a V-shaped cross section has the same cross-sectional shape as the bar mounting groove 6, and the positioning groove 7 has a larger opening width than the bar mounting groove 6. It is clear that the intended purpose of the present invention can be achieved if the groove angle is constant from the groove bottom to the opening, and that various cross-sectional shapes can be used.

On the other hand, when the groove depth of the rod mounting groove 6 is set so that about 5 to 20% of the rod diameter of the ultra-thin round rod 15 protrudes radially outward from the rod mounting groove 6 having a V-shaped cross section, Since it is not necessary to insert the groove pressing tool 3 that presses the ultra-thin round rod 15 into the minute rod placement groove 6, high precision in its shape and position is no longer required, and it can be constructed at low cost. Moreover, since the rod mounting groove 6 does not receive two or more ultra-thin round rods 15 at the same time, the reliability of the positioning operation is increased.

Furthermore, in the illustrated embodiment, as shown in FIG. 4, the tip 8a of the arrow 8 of the positioning tool 4 is rounded, so that even if some dirt enters the bottom of the positioning groove 7, the arrow 8 will properly engages the positioning groove 7,
This means that the rollers 1 and 2 are correctly positioned and fixed.

In the above embodiment, the bar pressing tool 3 is provided with a pressing piece 3a that is moved in the vertical direction by a lever, but as shown in FIG. A pressing roller 17 that is biased toward the outer circumferential surface of 1 may be provided.
In the case of this embodiment, it is sufficient to press the pressure roller 17 against the outer peripheral surface of the bar mounting roller 1 with a constant force, and as in the above embodiment, the pressure piece 3a is aligned with the position of the ultra-thin round bar 15. Since there is no need to move the rod up and down using a lever or the like, the supply of the ultra-thin round rod 15 can be further speeded up.

Further, in the embodiment shown in FIG. 1, as described above, the bar mounting roller 1 has a plurality of (three in this case) roller portions 1a to 1a spaced apart from each other in the axial direction.
1c, and these roller parts 1a to 1c are integrated via shaft parts 1d and 1e, which have a smaller diameter than the roller part. The rod mounting grooves 6 are formed on the outer peripheral edges of these roller portions 1a to 1c, respectively. Therefore, with such a configuration, even if the ultra-thin round rod 15 is somewhat curved, it can be mounted in the rod placement groove 6 without any problem. Of course,
The bar mounting roller 1 may have a form consisting of a single roller part with a predetermined width, or a form having two roller parts spaced apart from each other in the axial direction (for example, a form in which the roller part 1b or the roller part 1c is omitted). .

[Brief explanation of the drawing]

FIG. 1 is a side view of a positioning mechanism for an ultra-thin round bar showing an embodiment of the present invention, FIG. The figure is a schematic end view showing the relationship between the rod mounting groove and the positioning groove of the positioning mechanism shown in FIG. 1, FIG. 4 is an explanatory diagram of the configuration of the positioning tool of the positioning mechanism shown in FIG. FIG. 1 is an explanatory view of the operation of the positioning mechanism shown in FIG. 1, and FIG. 6 is a configuration explanatory view showing a modification of the bar pressing tool used in the positioning mechanism. 1... Bar mounting roller, 1a, 1b... Roller part, 2
...Positioning roller, 3...Bar pressing tool, 4...Positioning tool, 5...Shaft, 5a...Shaft portion, 6, 6a, 6b,...,
... Bar mounting groove, 7, 7a, 7b, ..., ... positioning groove.

Claims (1)

[Scope of Claims] 1. A bar mounting roller and a positioning roller having a larger diameter than the bar mounting roller are formed coaxially and integrally, and the outer peripheral edge of the bar mounting roller and the outer peripheral edge of the positioning roller are each provided with a circumference. A plurality of bar mounting grooves having a V-shaped cross section and a plurality of positioning grooves having a V-shaped cross section are arranged at intervals in the direction so that the groove bottoms are located at equal distances from the roller axis, and each The rod placement groove and the corresponding positioning groove are located on the same straight line parallel to the axis of the roller, and the groove bottom side of the positioning groove is formed to have the same cross-sectional shape as the rod placement groove, and positioning is performed. A positioning tool is provided facing the outer periphery of the positioning roller for accurately positioning the positioning groove in the roller rotation direction by engaging with the groove, and a rod corresponding to the positioning groove that is engaged with the positioning tool. A positioning mechanism for an ultra-thin round bar, in which a bar pressing tool for pressing a bar mounted in the bar mounting groove against the mounting groove is provided facing the outer periphery of a bar mounting roller. 2. The rod placement groove has such a depth that the rod placed in the rod placement groove protrudes from the outer periphery of the rod placement roller by 5 to 20% of the outside diameter of the rod. A positioning mechanism for an ultra-thin round rod according to claim 1.