JP4507321B2 - Vibration mechanism of parts alignment machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration mechanism for a component aligner for aligning electronic components, precision machine components, and the like on a component alignment pallet.
[0002]
[Prior art]
When handling a large amount of small parts such as electronic parts and precision machine parts, for example, if they are stored separately in a cardboard case, etc., it is difficult to handle and accidents such as damage are likely to occur, so efficient production management is possible in the manufacturing process. Difficult to do.
[0003]
As a specific example, when describing precision instruments such as ICs and watches, these parts are mass-produced except for special ones, and the number of parts handled in the manufacturing process and physical distribution process is enormous. For example, ICs are manufactured in a flow operation, and in manufacturing, necessary parts such as frames and packages of a predetermined lot number must be supplied in an aligned state for each process. However, it is impossible in terms of work efficiency to arrange a huge amount of small parts one by one manually.
[0004]
Therefore, conventionally, small components are aligned on a component alignment pallet using a swinging component aligner and supplied to the manufacturing process. Although there are various configurations of the oscillating parts aligner, a configuration example will be described below with reference to FIG.
[0005]
Referring to a schematic configuration of the swing type component aligner 1 shown in FIG. 8, an alignment pallet 2 for aligning desired components and a collection pallet 3 that can be called a dust removal shape are mounted on a vibration table 4, and this mounting is an alignment. The collection pallet 3 on one end side of the pallet 2 is supported by a stopper 5, the other end side is sandwiched by another collection pallet 3, and the fixing lever 7 biased in the direction of the stopper 5 by the compression spring 6 is opened and closed (in the direction of arrow A). And operation in the B direction).
[0006]
The vibration table 4 is configured to eccentrically vibrate about a rotation axis extending in the vertical direction in the figure while maintaining a horizontal state with respect to the swing table 8. Further, the vibration table 4 is configured to swing in the direction of arrows C and D in the figure with the lower swing table 8, and the swing table 8 is connected to the swing drive unit 11 via the connecting portion 9. It is connected.
[0007]
The swing drive unit 11 is provided on the base 12 and swings the swing table 8 in the directions of arrows C and D at a constant cycle by, for example, a motor and a cam mechanism. The oscillation period can be freely adjusted according to the shape and weight of the parts to be aligned.
[0008]
When parts are aligned, the parts are placed on the alignment pallet 2 and the vibration table 4 is swung in the directions of arrows C and D while being eccentrically vibrated. As a result, the parts reciprocate between the collection pallets 3 while vibrating on the alignment pallet 2, and in the meantime, the parts fit into a concave mold formed on the alignment pallet 2 in accordance with the shape of the parts. And align. When the components are accommodated in the mold, that is, when the alignment of the components is completed, the swing of the swing type component aligner 1 is stopped, and the recovery pallet 3 is pulled from the vibration table 4 while pulling the fixing lever 7. Then, the component alignment pallet 2 is removed from the vibration table 4. Then, in preparation for the next part alignment, the empty part alignment pallet 4 is mounted on the vibration table 4, and the process proceeds to the next part alignment operation.
[0009]
Having described the configuration example of the oscillating component aligner 1 and the component aligning operation, an example of the vibration mechanism of the vibration table 4 will be described next.
9 to 11 show an example of the vibration mechanism 21. As shown in FIG. 9, two pairs of shaft holders 22a and 22b are fixed to the four corners on the swing table 8, and a pair of slide shafts 23 are attached between the shaft holders 22a and 22b. 9 is a cross-sectional view taken along line EE in FIG. 10, and the swing table 8 is not shown.
[0010]
Since a slide bearing 24 through which the slide shaft 23 is inserted is fixed to the bottom surface of the vibration table 4, the entire vibration table 4 reciprocates in the directions of arrows F and G while being guided by the slide shaft 23, and the slide shaft Reciprocating in the direction orthogonal to the arrows F and G while being guided by another slide shaft (not shown) orthogonal to 23.
That is, the vibration table 4 can be eccentrically oscillated around the motor shaft 25.
[0011]
On the other hand, a motor M is fixed to the swing table 8, and an eccentric cam 26 is attached to the motor shaft 25 as shown in an enlarged manner in FIG. A rotating ring 28 having a bearing 27 is attached to the outer periphery of the eccentric cam 26, and a connecting member 29 is attached to one end of the outer periphery of the rotating ring 28. A ball joint 30 is provided in a planted shape on the bottom surface of the vibration table 4, and the other end of the connecting member 29 is attached to the ball joint 30.
[0012]
In the vibration mechanism 21 having such a configuration, when the motor M is rotated, the eccentric cam 26 rotates. However, since the shaft center is displaced, the eccentric cam 26 rotates in an axial manner. At this time, the rotary ring 28 itself does not rotate due to the action of the bearing 27, but the position thereof makes a circular motion. Since the motor M is fixed to the swing table 8, the vibration table 4 is moved in the direction orthogonal to the arrow F and G directions and the arrow F and G directions via the connecting member 29 and the ball joint 30. The reciprocating motion causes eccentric vibration while the vibration table 4 swings.
[0013]
The vibration width of the vibration table 4 is 2L when the distance between the center of the eccentric cam 26 and the center of the motor shaft 25 is L, and this vibration width can be freely changed. The vibration speed can be freely changed by controlling the number of rotations of the motor M.
[0014]
By the way, as an environmental condition for installing this type of oscillating parts aligner, various devices such as precision machines are installed in the surrounding area. When the entire moving parts aligner vibrates and propagates to the surrounding equipment that constitutes the automatic machine installed for flow work, for example, the accuracy of reading operation of the image processing device, etc. Therefore, preventing the propagation of the vibration may be an indispensable condition for designing the swing type component aligner.
[0015]
[Problems to be solved by the invention]
For this reason, some anti-vibration measures have been taken into consideration, such as setting the weight of the gantry provided at the bottom of the oscillating parts alignment machine to be larger than necessary, but sufficient anti-vibration measures have not been taken. There was a need for fundamental measures.
[0016]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a vibration mechanism of a parts aligner that can effectively prevent vibrations of a vibration table from propagating to the surroundings. It is in.
[0017]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is a motor fixed to a base, an eccentric cam attached to a rotation shaft of the motor, and rotatably fitted on an outer periphery of the eccentric cam. A vibration of a component aligner that includes a rotating ring and a vibration table coupled to the rotating ring, and that vibrates the vibration table via the rotating ring by a shaft swing movement of the eccentric cam caused by rotation of the rotating shaft. in mechanism, a balancer attached to the rotary shaft in order to offset the vibration to the rotary shaft more occurring in the axial deflection movement of the eccentric cam, said balancer, a plate-shaped holder detachably on the holder The holder has a fitting hole for the rotating shaft and a mounting hole for the weight, and the weight is a body part fitted in the mounting hole; A circular head larger than the mounting hole, and in order to adjust the vibration canceling ability of the balancer, by varying the height of the circular head, a plurality of types having different weights are prepared, The body portion is selectively fitted into the mounting hole of the holder .
[0018]
In the present invention, the vibration transmitted to the base can be canceled by a simple configuration in which the balancer that cancels the vibration to the motor shaft caused by the shaft wobbling motion of the eccentric cam is attached to the rotating shaft, and the vibration propagates to the surroundings. In addition to being able to effectively prevent this, it is possible to prepare multiple types of weights with different weights by using different heights for the circular head and selectively use these weights. Thus, since the balancer's vibration canceling ability is adjusted, even when the amount of shaft deflection of the eccentric cam is changed, propagation of vibration can be suppressed to the maximum by simple adjustment .
[0019]
The invention according to claim 2 prepares a plurality of types of weights having different center-of-gravity radii by varying the position of the circular head with respect to the body, and selectively uses these weights to thereby reduce the vibration canceling ability of the balancer. It is characterized by adjusting .
[0023]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
Hereinafter, an embodiment of an oscillating component aligner to which the present invention is applied will be described with reference to FIGS.
[0024]
FIG. 1 is a cross-sectional view showing a configuration of a vibration mechanism of a vibration table, and FIGS. 3 is an exploded perspective view of the balancer of the vibration mechanism, FIG. 4 is a plan view of the holder (main body) of the balancer, FIG. 5 is a bottom view showing the bottom configuration of the vibration table and a part of the vibration mechanism, and FIG. It is a side view which shows the structure of a mechanism. In the description of the embodiment, the drawings and symbols used in the description of the conventional example are used as appropriate.
[0025]
The configuration of the vibration mechanism 41 in this embodiment can be broadly divided into a support portion and a cam mechanism for rotating the vibration table 4 in a horizontal state. First, the schematic configuration of the support portion will be described. As shown in FIG. 5, a slide bearing 24 that moves along the slide shaft 23 is provided on the bottom surface of the vibration table 4. Slide shafts 42 are provided, and end portions of the respective slide shafts 42 are fixed to the swing table 8 by fixed stays 43a and 43b. Both end portions of the slide shaft 23 are fixed to slide bearings 44 a and 44 b that move along the slide shafts 42.
[0026]
According to such a support structure, the vibration table 4 reciprocates in the X direction shown in FIG. 5 by the slide bearing 24 that moves along the slide shaft 23. The slide bearings 44a and 44b are configured to move along the slide shaft 42, but are not fixed to the vibration table 4, so that the vibration table 4 reciprocates in the X direction, The slide bearings 44a and 44b reciprocate in the Y direction. As a result, if the vibration table 4 is urged in the X direction and the Y direction by a cam mechanism 51 described later, the vibration table 4 rotates in two axial directions on the horizontal plane, but includes reciprocation in the two axial directions. It will vibrate in the state.
[0027]
Next, the configuration of the cam mechanism 51 will be described. The cam mechanism 51 is provided almost at the center of the bottom surface of the vibration table 4. As shown in FIG. 1, the cam mechanism 51 includes a motor M fixed to the swing table (base) 8, a rotating shaft 53 fixed to the motor shaft 52, an eccentric cam 54 provided on the rotating shaft 53, and an eccentric cam. A rotation ring 57 that is rotatably fitted to the outer periphery of 54 via a bearing 56, a balancer 70 attached to the rotation shaft 53, and the like.
[0028]
As shown in FIG. 2, the eccentric cam 54 includes an eccentric cam main body 54a formed integrally with the rotary shaft 53 and an eccentric amount adjusting collar 54b fitted to the outer periphery thereof. By adjusting the relative rotational position, the amount of eccentricity can be adjusted within the range of the minimum value (zero) shown in FIG. 2 (a) to the maximum value shown in FIG. 2 (b). The collar 54b is provided with a lock bolt 54c so that the collar 54b can be locked at the adjustment position.
[0029]
Further, the balancer 70 is for canceling vibrations to the motor shaft caused by the shaft swing motion of the eccentric cam 54, and as shown in FIG. 3, a plate-like holder (main body) 71 and a weight attached to and detached from it. (Unbalanced mass body) 72. The holder 71 has a fitting hole 73 for the rotating shaft 53 and a mounting hole 74 for the weight 72. The fitting hole 73 and the mounting hole 74 are formed on both end sides of the holder 71 at a predetermined interval, and the holder 71 is attached to the peripheral wall of the fitting hole 73 with the fitting hole 73 fitted to the rotating shaft 53. Lock bolts 75 (shown only by screw holes in FIGS. 3 and 4) for locking to the rotating shaft 53 are provided, and the weight 72 is attached to the holder 71 with the weight 72 mounted in the mounting hole 74 on the peripheral wall of the mounting hole 74. Lock bolts 76 (shown only by screw holes in FIGS. 3 and 4) are provided.
[0030]
The weight 72 has a trunk portion 72a that fits in the mounting hole 74 and a circular head portion 72b that is larger than the mounting hole 74. For example, the weight 72 can be made to have a weight (mass) by varying the height H of the circular head portion 72b. Different types are available.
[0031]
According to the cam mechanism 51 configured as described above, the eccentric cam 54 rotates around the motor shaft 52 by rotating the motor M. As a result, the rotating ring 57 itself does not rotate, but its position moves around the eccentric cam 54. If the motor shaft 52 rotates, for example, clockwise, the entire rotating ring 57 rotates clockwise. Move, in other words, rotate. Since the rotation ring 57 is fixed to the vibration table 4, a force for rotating the vibration table 4 acts as the rotation ring 57 rotates.
[0032]
Here, when the support structure of the vibration table 4 is recalled, the vibration table 4 is configured to reciprocate in the X direction and the Y direction by the support portion. Therefore, when the cam mechanism 51 is driven as described above, the vibration table 4 rotates in the direction of arrow H in FIG.
[0033]
When the vibration is generated by the cam mechanism 51 in this way, the rotation shaft 53 is provided with the balancer 70 that cancels the vibration to the motor shaft caused by the shaft swing motion of the eccentric cam 54. The transmitted vibration can be canceled and the vibration can be effectively prevented from propagating to the surroundings.
[0034]
Further, when the amount of shaft deflection of the eccentric cam 54 is changed, the propagation of vibration can be suppressed to the maximum by replacing the weight 72 of the balancer 70 accordingly. In this case, since the weight 72 which is an unbalanced mass body is only exchanged with respect to the holder 71 of the balancer 70, it can be adjusted easily.
[0035]
As described with reference to FIG. 8, the swing table 8 is mounted on the swing type component aligner 1 and swings in the directions of arrows C and D by the action of the connecting portion 9 and the swing drive portion 11. . At the same time, when the cam mechanism 51 is driven as described above, the vibration table 4 swings in the directions of arrows C and D and vibrates as indicated by the arrow H in FIG. As a result, a rotational force is applied to the aligned parts of the vibration table 4, and the parts can be positioned and aligned in the radial direction. Further, it is possible to efficiently align parts having a high coefficient of friction such as rubber products.
[0036]
In addition, this invention is not limited to each embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible. For example, in the embodiment described above, a plurality of weights 72 having different weights are prepared and selectively mounted on the holder 71 to adjust the vibration canceling ability of the balancer 70. The same effect can be obtained by changing the center of gravity radius R of the balancer 70 shown.
[0037]
In practice, for example, as shown in FIG. 7, the center of gravity radius can be changed by shifting the position of the head 72b with respect to the trunk 72a. In the case of the weight 72 of (a), the center L of the body 72a and the center of gravity G of the head 72b are made to coincide with each other, and the center of gravity radius with respect to the head 72b is R1, but the weight 72B of (b) and (c). 72C, the center of gravity G of the head 72b is decentered with respect to the center L of the body 72a, and the centers of gravity of the head 72b are R2 and R3. Therefore, for example, as shown in (d), if the weight 72D in which the head 72b is eccentric with respect to the body 72a is created, the center-of-gravity radius can be easily changed.
[0038]
【The invention's effect】
As described above, according to the invention of claim 1, the simple structure of attaching the balancer to the rotating shaft of the eccentric cam can prevent the propagation of vibrations to the surroundings, and the circular head By preparing multiple types of weights with different heights and selectively using these weights, the balancer's vibration canceling ability is adjusted, so even if the eccentric cam shaft runout amount is changed, it is easy the Do adjustment can be suppressed to maximize the propagation of the vibration.
[0039]
According to the second aspect of the present invention, a plurality of types of weights having different center-of-gravity radii are prepared by varying the position of the circular head with respect to the trunk, and the balancer can be vibrated by selectively using these weights. The offset capability can be easily adjusted .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a vibration mechanism according to an embodiment of the present invention.
FIGS. 2A and 2B are views taken along the line II in FIG. 1. FIG. 2A shows a case where the eccentric cam is adjusted to the minimum eccentric amount, and FIG. 2B shows a case where the eccentric cam is adjusted to the maximum eccentric amount.
FIG. 3 is an exploded perspective view of a balancer provided in the vibration mechanism.
FIG. 4 is a plan view of a holder of the balancer.
FIG. 5 is a bottom view showing a support structure of a vibration table of an oscillating parts aligner to which the vibration mechanism of the present invention is applied.
FIG. 6 is a side view showing a configuration of a vibration mechanism.
FIGS. 7A and 7B are explanatory views of how to adjust the center of gravity radius of the balancer according to another embodiment of the present invention. FIGS. 7A to 7C are side views of weights having different center of gravity radii, and FIG. It is the perspective view seen from under the weight.
FIG. 8 is a side view showing a configuration of a conventional oscillating component aligner.
FIG. 9 is a bottom view of a vibration table of a conventional vibration mechanism.
FIG. 10 is a side view showing the configuration of the vibration mechanism.
FIG. 11 is an enlarged sectional view showing a configuration of an eccentric cam in the vibration mechanism.
[Explanation of symbols]
4 Vibration table 8 Swing table (base)
41 Vibration mechanism 54 Eccentric cam 57 Rotating ring 53 Rotating shaft 70 Balancer 71 Holder (main body)
72, 72B, 72C, 72D Weight (unbalanced mass)
M motor

Claims (2)

A motor fixed to the base; an eccentric cam attached to a rotation shaft of the motor; a rotary ring rotatably fitted on an outer periphery of the eccentric cam; and a vibration table coupled to the rotary ring. In the vibration mechanism of the component aligner that applies vibration to the vibration table via the rotating ring by the axial cam movement of the eccentric cam caused by the rotation of the rotating shaft,
A balancer attached to the rotary shaft in order to cancel out vibrations to the rotary shaft caused by the shaft deflection motion of the eccentric cam;
The balancer comprises a plate-shaped holder and a weight that is detachably attached to the holder,
The holder has a fitting hole for the rotating shaft and a mounting hole for the weight,
The weight has a body portion fitted in the mounting hole and a circular head larger than the mounting hole, and the height of the circular head is varied to adjust the vibration canceling ability of the balancer. Thus, a plurality of types having different weights are prepared, and the body portion is selectively fitted into the mounting hole of the holder. A motor fixed to the base; an eccentric cam attached to a rotation shaft of the motor; a rotary ring rotatably fitted on an outer periphery of the eccentric cam; and a vibration table coupled to the rotary ring. In the vibration mechanism of the component aligner that applies vibration to the vibration table via the rotating ring by the axial cam movement of the eccentric cam caused by the rotation of the rotating shaft,
A balancer attached to the rotary shaft in order to cancel out vibrations to the rotary shaft caused by the shaft deflection motion of the eccentric cam;
The balancer comprises a plate-shaped holder and a weight that is detachably attached to the holder,
The holder has a fitting hole for the rotating shaft and a mounting hole for the weight,
The weight has a trunk portion fitted in the mounting hole and a circular head portion larger than the mounting hole, and the position of the circular head portion with respect to the trunk portion is adjusted to adjust the vibration canceling ability of the balancer. A plurality of types having different center-of-gravity radii are prepared by making different, and the body portion is selectively fitted into the mounting hole of the holder.

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