JP2013055116A - Rolling mechanism and tape feeder using rolling mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and accurately transmit power of a driving source to a rotating body, and to smoothly rotate the rotating body by reducing rotational resistance and impact received by the rotating body.
A rotating mechanism that transmits power of a driving source 20 to a rotating body 40 to rotate the rotating body 40, and has a circumferential play in the rotating body 40 when stationary. The rotating body 40 is provided with an annular engaging portion 41 that extends over the entire circumference, and a roller member 62 is supported at an immovable portion around the annular engaging portion 41 so as to be rotatable substantially in parallel with the rotating body 40. The roller member 62 is provided so as to be pressed against the outer peripheral portion of the annular engagement portion 41 by the urging force of the urging member 63 and to deviate the pressing direction p from the central axis of the rotating body 40.
[Selection] Figure 1

Description

  The present invention relates to a rotation mechanism that rotates a rotating body by driving a drive source, and more particularly to a rotation mechanism that is suitable for use in a tape feeder in which a tape with electronic components attached is fed out by a sprocket. .

  As means for mounting electronic components on a substrate, the tape on which the electronic components are mounted is pitch-fed by a tape feeder, and the electronic components on the pitch-fed tape are picked up by the transfer device and placed on the substrate. This is widely implemented (see, for example, Patent Document 1).

By the way, in the above-described conventional tape feeder, there is a mechanism that uses a power transmission mechanism that transmits rotational force by a plurality of gears meshing with each other as a mechanism for transmitting rotational force to a sprocket for feeding out the tape. In such a power transmission mechanism, a play (gap) called backlash is provided between the gears in order to smoothly rotate the gears meshing with each other.
For this reason, when the plurality of gears are stopped, the sprocket has a rattling in the circumferential direction due to the backlash. There may be a response delay at the start.
Therefore, as one means for eliminating the backlash due to the backlash, for example, it is proposed that the stopper claw is engaged with and disengaged from the engaged state with the gear integrated with the sprocket every time the sprocket is rotated by a predetermined pitch. (See Patent Document 2).

  However, according to the structure in which the stopper claw is simply engaged with and disengaged from the gear, the sprocket and the gear (rotary body) integrated with the sprocket are subjected to resistance and impact due to the engagement of the stopper claw, and the sprocket can be smoothly rotated. Or vibration may be transmitted to the sprocket.

JP-A-3-243563 JP 2011-23512 A

  The present invention has been made in view of the above-described conventional circumstances, and the problem is that the power of the drive source can be efficiently and stably transmitted to the rotating body, and the rotational resistance and impact received by the rotating body can be reduced. An object of the present invention is to provide a rotating mechanism that can smoothly rotate a rotating body and a tape feeder using the rotating mechanism.

  The technical means for solving the above-mentioned problem is a rotating mechanism that transmits the power of the drive source to the rotating body to rotate the rotating body, and the rotating body is stationary in the circumferential direction when it is stationary. In the rotating mechanism having means for eliminating the above, a rotating member is provided with an annular engaging portion over the entire circumference, and a roller member is provided at an immovable portion around the annular engaging portion so as to be rotatable substantially in parallel with the rotating member. The roller member is pressed against the outer peripheral portion of the annular engagement portion by the urging force of the urging means, and is provided so as to divert the pressing direction from the central axis of the rotating body. To do.

Since the present invention is configured as described above, the following effects can be obtained.
Since the roller member is urged by the urging means and is pressed against the outer peripheral portion of the annular engagement portion, and the pressing direction is deviated from the central axis of the rotator, the rotator is always in one of the circumferential directions. By energizing, circumferential play can be eliminated.
Therefore, it is possible to prevent the rotating body from rattling due to play in the circumferential direction.
In addition, since the roller member pressed by the annular engagement portion of the rotating body is rotatable, the resistance and impact received by the rotating body from the roller member should be reduced as compared with the case where a conventional stopper claw is used. Can do.
Therefore, the power of the drive source can be efficiently and stably transmitted to the rotating body, and the rotating body can be smoothly rotated by reducing the rotational resistance and impact received by the rotating body.

It is a side view which shows an example of the rotation mechanism (tape feeder) which concerns on this invention. It is an enlarged view of the II section in FIG.

  According to a first embodiment for carrying out the present invention, there is provided a rotating mechanism that transmits power of a driving source to a rotating body to rotate the rotating body, and the rotating body when stationary is in a circumferential direction. In the rotating mechanism having play, the rotating body is provided with an annular engaging portion over the entire circumference, and a roller member is supported at an immovable portion around the annular engaging portion so as to be rotatable substantially in parallel with the rotating body. The roller member is pressed against the outer peripheral portion of the annular engagement portion by the urging force of the urging means, and is provided so as to divert the pressing direction from the central axis of the rotating body.

In the second embodiment, the pressing direction deviates from the central axis of the rotating body so as to face the rotating direction of the rotating body.
According to this aspect, in particular, it is possible to effectively eliminate the response delay when the stopped rotating body is restarted.

In the third embodiment, the annular engagement portion and the roller member are formed in a gear shape that meshes with each other.
According to this aspect, it is possible to prevent slippage between the annular engagement portion and the roller member, and thus it is possible to effectively bias the rotating body in one circumferential direction.

Further, in the fourth embodiment, a rocking member having a base end side supported by an immovable portion so that the distal end side approaches and separates from the outer peripheral portion of the annular engagement portion is provided, and the roller is disposed on the distal end side of the rocking member. The member is rotatably supported, and an urging member for oscillating the oscillating member along the pressing direction is provided as the urging means.
According to this form, the structure which presses a roller member with respect to the outer peripheral part of an annular engaging part can be made into the concrete structure with simple and favorable productivity.

In the fifth embodiment, the fulcrum of the swing member is disposed on the opposite side of the rotating body with respect to the rotation direction with respect to the roller member.
If the fulcrum of the oscillating member is disposed on the rotating direction side of the rotating member with respect to the roller member, the resistance when the roller member bites the rotating member and restarts the stopped rotating member. May increase. However, according to the fifth embodiment, the above-described problems can be solved, and the swinging member can be smoothly separated in the separation direction when the stopped rotating body is restarted.

In a sixth aspect, the drive source is a rotary electric motor, and includes a plurality of gears that transmit a rotational force from the rotary electric motor to the rotary body, and the play in the circumferential direction of the rotary body meshes with each other. It is due to backlash between.
According to this aspect, it is possible to effectively prevent rattling due to backlash between the gears, and to prevent rattling at the stop position of the rotating body or delay in response during restart. Can do.

In a seventh embodiment, a tape feeder is provided that includes a sprocket that rotates integrally with the rotating body, and that allows the tape to be fed by engaging a tape with an outer peripheral portion of the sprocket.
According to this aspect, it is possible to stably transmit the power of the drive source to the sprocket, and thus it is possible to provide a tape feeder that can control tape feeding with high accuracy.

  Hereinafter, a particularly preferred embodiment of the above embodiment will be described in detail based on the drawings.

FIG. 1 shows a tape feeder that feeds out a tape T on which an electronic component is mounted using a rotating mechanism according to the present invention.
The tape feeder is transmitted to the base 10, a drive source 20 fixed to the base 10, a power transmission mechanism 30 that transmits the power of the drive source 20 through a plurality of gears that mesh with each other, and the power transmission mechanism 30. A rotating body 40 that is rotated by a rotating force, a sprocket 50 that is provided so as to rotate integrally with the rotating body 40 and feeds the tape T, and the rotating body 40 in a direction opposite to the rotating direction (according to the illustrated example). And a rotating body urging mechanism 60 urging in the clockwise direction.

  The base 10 is formed in a flat plate shape from a rigid material such as a metal, for example, and a drive source 20, a power transmission mechanism 30, a rotating body 40, a sprocket 50, a rotating body biasing mechanism 60, etc., which will be described later, are provided on one surface thereof. I support it.

  The drive source 20 is a rotary electric motor, and in this embodiment, a brushless DC motor controlled to start and stop at every predetermined rotation angle is used. Other examples of the drive source 20 may be a brushed DC motor, a stepping motor, a pneumatic motor, or the like.

  The power transmission mechanism 30 is a mechanism that reduces the rotational speed of the drive shaft of the drive source 20 and transmits it to the rotating body 40 by meshing a plurality of gears. The size, the number, the combination, and the like of the plurality of gears are not limited to those shown in the drawings, and are appropriately set according to the rotational speed and torque of the drive source 20, the feed speed of the tape T, and the like.

  The rotating body 40 is supported so as to be rotatable in both directions with respect to the base body 10 via a rotating shaft 40a. The rotating body 40 includes a gear-shaped annular engaging portion 41 provided on the outer peripheral side (the outer peripheral surface in the illustrated example) of the rotating body 40 over the entire circumference. By being meshed with 31, it rotates in one direction (in the example shown, counterclockwise). In addition to the gear 31, a gear-shaped roller member 62 described later is meshed with the annular engagement portion 41.

  In the illustrated example, as a simple and preferable form, both the gear 31 and the roller member 62 are engaged with the same annular engaging portion 41. However, as another example, two annular members having different diameters are used. An engaging portion may be provided, and the gear 31 and the roller member 62 may be separately engaged with each annular engaging portion.

Between the gear-shaped annular engagement portion 41 of the rotating body 40 and the gear 31 meshing with the annular engagement portion 41, or between adjacent gears in other gears constituting the power transmission mechanism 30, A so-called backlash is provided to smoothly engage and rotate these gears.
For example, as shown in FIG. 2, this backlash occurs between the gear-like annular engagement portion 41 of the rotating body 40 and the gear 31 meshing with the annular engagement portion 41 on the annular engagement portion 41 side. When one tooth part 31a on the gear 31 side is fitted between two tooth parts 41a1 and 41a2 adjacent in the circumferential direction, the two tooth parts 41a1 and 41a2 are on the counter-rotation direction side (see FIG. 2). A gap S (play) formed between the tooth portion 41a1 on the lower side and one tooth portion 31a on the gear 31 side.
The backlash is formed between the plurality of gears constituting the power transmission mechanism 30 in addition to the space between the annular engagement portion 41 and the gear 31 in the same manner as described above. The rotation mechanism of this embodiment is formed as a gap S between the two tooth portions 41a1 and 41a2 by backlash between a plurality of gears including the annular engagement portion 41 and the gear 31 or by integrating these backlashes. It is intended to eliminate backlash.

The sprocket 50 is provided coaxially with the rotating body 40 so as to rotate integrally with the rotating body 40 in the axial direction of the rotating body 40. A plurality of tooth portions 51 a are provided on the outer peripheral portion of the sprocket 50 at predetermined intervals in the circumferential direction so as to engage with a plurality of engaged holes (not shown) of the tape T.
The specific structure for integrally rotating the sprocket 50 and the rotating body 40 includes, for example, an aspect in which the sprocket 50 is fixed to the side surface of the rotating body 40, an aspect in which the sprocket 50 and the rotating body 40 are integrally formed, and the same rotation. What is necessary is just to set it as the aspect which fixed both the sprocket 50 and the rotary body 40 with respect to the axis | shaft 40a.

  Further, the rotating body urging mechanism 60 includes a swinging member 61 whose base end side is supported by the base body 10 (non-moving part) so that the distal end side is moved closer to and away from the outer peripheral portion of the annular engagement portion 41 of the rotating body 40. A roller member 62 rotatably supported on the distal end side of the swinging member 61, and a biasing member 63 (biasing means) for biasing the swinging member 61 so as to swing along the pressing direction p. Prepare.

The oscillating member 61 has a base end side that is rotatably supported with respect to the base body 10, and a roller member 62 that is rotatably supported on the distal end side (in other words, the free end side).
The fulcrum 61a on the base end side of the swinging member 61 is on the opposite side to the rotation direction of the rotating body 40 with reference to the support point of the roller member 62 on the distal end side of the swinging member 61 (from the roller member 62 according to FIG. Also on the left side). Here, the rotation direction means the rotation direction of the rotating body 40 at the contact point between the outer periphery of the rotating body 40 and the outer periphery of the roller member 62. More specifically, the fulcrum 61a is located on the opposite side of the rotation direction with a virtual straight line c connecting the center of the rotating body 40 and the center of the roller member 62 as a boundary.

  The biasing member 63 is a torsion spring wound in a coil shape on the fulcrum 61a portion of the swinging member 61. One end side of the biasing member 63 is locked to the base 10, and the other end side is fixed to the swinging member 61. The roller member 62 on the distal end side of the swing member 61 is biased so as to be pressed by the annular engagement portion 41.

The locking structure of the urging member 63 will be described in detail. As shown in FIG. 1, a plurality (three in the illustrated example) are provided at predetermined intervals on the lower side of the swing member 61 in the base 10. Protrusions 11, 12, and 13 are provided, and the urging force of the urging member 63 can be appropriately adjusted by selectively locking one end side of the urging member 63 to these protrusions.
For example, according to an example shown in FIG. 1, the one end side of the urging member 63 is inserted and locked to the protrusion 12, but if the one end side of the urging member 63 is inserted into the protrusion 13, the urging member The urging force of 63 can be weakened, and the pressing force of the roller member 62 against the annular engaging portion 41 can be weakened.

The roller member 62 is disposed so that the outer peripheral portion protrudes toward the rotating body 40 on the distal end side of the swinging member 61, and the swinging member is interposed via a shaft member 62 a substantially parallel to the central axis of the rotating body 40. 61 is rotatably supported.
The outer peripheral portion of the roller member 62 is formed in a gear shape that meshes with the gear-shaped annular engagement portion 41 of the rotating body 40. According to the present embodiment, the material of the roller member 62 is a rigid material such as a metal material, a hard synthetic resin material, or ceramic, but other examples include a rubber or a soft rigid resin material. It is also possible.
The roller member 62 is urged by the urging member 63 together with the swinging member 61, so that the roller member 62 is pressed against the annular engagement portion 41 of the rotating body 40. This pressing direction p (see the two-dot chain line in FIG. 1) opposes the rotating direction of the rotating body 40 (counterclockwise in the illustrated example) by appropriately arranging the swinging member 61 and the roller member 62. Thus, the center axis of the rotating body 40 (specifically, the center portion of the rotating shaft 40a) is deviated.
In other words, the pressing direction p is inclined with respect to an imaginary straight line c (see FIG. 1) connecting the center of the rotating body 40 and the center of the roller member 62 and is opposed to the rotating direction of the rotating body 40. According to an example shown in FIG. 1, the extension line in the pressing direction p is slightly shifted to the left side of the rotating body 40.

According to the rotating body urging mechanism 60 configured as described above, the roller member 62 is pressed against the rotating body 40 so as to face the rotating direction of the rotating body 40 as described above.
The urging force in the reverse rotation direction (clockwise according to FIG. 1) acts on the rotator 40. This urging force can be adjusted by adjusting the resilience of the urging member 63. That is, if the urging force of the urging member 63 is increased, the urging force in the reverse rotation direction can be increased. Conversely, if the urging force of the urging member 63 is decreased, the urging force in the reverse rotation direction is increased. Can be reduced.
Here, the substantially parallel relationship between the central axis of the rotating body 40 and the shaft member 62a may be within a range that does not prevent the roller member 62 from pressing the rotating body 40.

  In this embodiment, the roller member 62 is mounted in an annular shape so as to be substantially rotatable with respect to the shaft member 62a fixed to the swinging member 61. However, if necessary, the roller member 62 is provided. An appropriate rotational resistance may be applied to the roller member 62 by adjusting the frictional force between the shaft member 62a and the shaft member 62a. That is, it is possible to increase the biasing force in the reverse rotation direction by increasing the rotation resistance.

Next, the characteristic effects of the tape feeder having the above-described configuration will be described in detail.
When the drive shaft of the drive source 20 rotates, the rotational force is transmitted to the rotating body 40 by the power transmission mechanism 30. More specifically, the annular engagement portion 41 of the rotating body 40 meshes with the gear 31 on the counter drive source side in the power transmission mechanism 30, and the rotating body 40 rotates. At this time, as described above, a gap S due to backlash is formed between the annular engagement portion 41 and the gear 31 (see FIG. 2), and adjacent tooth portions 41a1 and 41a2 in the annular engagement portion 41 are formed. One tooth portion 31a on the gear 31 side comes into contact with the tooth portion 41a2 on the rotation direction side (the upper side in FIG. 2).

While the rotating body 40 is rotating and stopped, the roller member 62 is urged and pressed against the outer peripheral portion of the annular engaging portion 41 by the urging member 63, and the pressing direction p is the rotating direction of the rotating body 40. The rotating body 40 receives a biasing force in the reverse rotation direction (clockwise according to the illustrated example) by the rotating body biasing mechanism 60 because the rotating body 40 is displaced from the central axis of the rotating body 40 so as to be opposed to each other. Become.
Therefore, even when the drive source 20 is stopped, the rotating body 40 receives the urging force in the reverse rotation direction, so that the rotation direction side of the adjacent tooth portions 41a1 and 41a2 in the annular engagement portion 41 (FIG. 2). According to the above, the tooth portion 41a2 on the upper side is stopped in a state where one tooth portion 31a on the gear 31 side is in contact with the tooth portion 41a2, that is, the state where there is no rattling in the circumferential direction as in the rotation.

  Further, when the rotating body 40 is started from a stopped state, since the start is from a state where there is no rattling as described above, there is no response delay in the starting. In addition, at the time of starting, the roller member 62 rolls along the annular engaging portion 41 of the rotating body 40 and the swinging member 61 is separated from the rotating body 40 by the reaction force received from the annular engaging portion 41. Due to the slight movement in the direction, the rotator 40 starts and rotates smoothly with almost no rotational resistance or impact from the roller member 62.

  Therefore, in the control for pitch-feeding the tape T by repeating the start and stop of the drive source 20 at predetermined time intervals, the stop positions of the rotating body 40 and the sprocket 50 vary when stopped, and the feed amount per pitch of the tape T As a result, it is possible to prevent the feeding amount from being varied, and the feed amount can be maintained with high accuracy.

  In addition, according to the said Example, although the rotary body 40 and the roller member 62 were formed in gear shape as a particularly preferable aspect, as another example, the rotary body 40 and the roller member 62 are mutually made to contact an outer peripheral surface. It is also possible to form a friction wheel that rolls.

  Further, according to the above embodiment, as a particularly preferable mode, the pressing direction p is deviated from the central axis of the rotating body 40 so as to face the rotating direction of the rotating body 40. Depending on the application, the control mode, etc., the configuration in which the pressing direction p is deviated from the central axis of the rotating body 40 along the rotating direction of the rotating body 40 (that is, according to FIG. 1, the pressing direction p is changed to the rotating shaft 40a). It is also possible to prevent the rotating body 40 from rattling in the circumferential direction when stopped.

  Further, according to the above-described embodiment, as a particularly preferable aspect, the fulcrum 61a of the swing member 61 is disposed on the opposite side to the rotation direction of the rotating body 40 with respect to the roller member 62. It is also possible to arrange the fulcrum 61a of the moving member 61 on the rotational direction side of the rotating body 40 (according to FIG. 1, the right side of the roller member 62) with respect to the roller member 62.

  Further, according to the above embodiment, the biasing member 63 that is a torsion spring is provided as the biasing means for biasing the swinging member 61 so as to swing along the pressing direction p. As other examples, a mode in which the swing member 61 is biased by a spring, a mode in which the swing member 61 is biased by a leaf spring, a mode in which the swing member 61 is biased by a tension spring or a compression spring, swing It is also possible to adopt a mode in which the member 61 is urged by its own weight or the weight of the weight.

  Further, according to the above embodiment, the roller member 62 is swung via the swing member 61. However, as another example, the swing member 61 is omitted and the base 10 is guided along the pressing direction p. (Specifically, a long hole (not shown) along the pressing direction p) is provided, and the support shaft of the roller member 62 is engaged with the guide portion so that the roller member 62 can reciprocate along the pressing direction p. While being held, the roller member 62 may be urged by an urging means (for example, a tension spring, a compression spring, a leaf spring, or its own weight) and pressed against the annular engagement portion 41.

  Further, according to the above description, it is assumed that the backlash of the rotating body 40 in the rotation direction is caused by backlash between the gears. In the above embodiment, the backlash of the rotating body 40 is the drive source 20. Even if it is due to the characteristics of the motor or other characteristics on the drive source side, the rattling of the rotating body 40 can be eliminated.

  In the above embodiment, the power transmission mechanism 30 composed of a plurality of gears is used as means for transmitting the rotational force of the drive source 20 to the rotating body 40. However, as another example, a power transmission mechanism composed of a belt and a pulley is used. Thus, it is possible to adopt a mode in which the rotational force of the driving source 20 is transmitted to the rotating body 40, a mode in which the rotating body 40 is directly driven by the driving source 20, or the like.

  In the above embodiment, the rotary drive source 20 is used as a structure for rotating the rotating body 40. However, as another example, a mechanism for rotating the rotating body 40 by a predetermined angle by a plunger that reciprocates by an electromagnetic solenoid. Alternatively, it is also possible to use a mechanism that converts the linear driving force of the linear motor into a rotational force and rotates the rotating body 40 by the rotational force.

10: Substrate (immobilized part)
20: Drive source 30: Power transmission mechanism 40: Rotating body 41: Annular engagement part 50: Sprocket 60: Rotating body urging mechanism 61: Oscillating member 62: Roller member 63: Energizing member (urging means)
p: pressing direction S: gap (play)
T: Tape

Claims (7)

A rotating mechanism that transmits power of a driving source to a rotating body to rotate the rotating body, and has a means for eliminating play in the circumferential direction in the rotating body when stationary,
An annular engagement portion is provided over the entire circumference of the rotary body, and a roller member is supported at an immovable portion around the annular engagement portion so as to be rotatable substantially in parallel with the rotary body.
The rotating mechanism is characterized in that the roller member is pressed against the outer peripheral portion of the annular engaging portion by the biasing force of the biasing means, and is provided so as to divert the pressing direction from the central axis of the rotating body.   The rotating mechanism according to claim 1, wherein the pressing direction is deviated from a central axis of the rotating body so as to face the rotating direction of the rotating body.   The rotation mechanism according to claim 1 or 2, wherein the annular engagement portion and the roller member are formed in a gear shape that meshes with each other.   A rocking member having a base end side supported by an immovable portion so that the distal end side approaches and separates from the outer peripheral portion of the annular engagement portion, and the roller member is rotatably supported on the distal end side of the rocking member; 4. The rotating mechanism according to claim 1, wherein a biasing member that swings the swinging member along the pressing direction is provided as the biasing unit.   The rotation mechanism according to claim 4, wherein the fulcrum of the swing member is arranged on the opposite side to the rotation direction of the rotating body with respect to the roller member.   The drive source is a rotary electric motor, and includes a plurality of gears that transmit a rotational force from the rotary electric motor to the rotary body, and circumferential play in the rotary body is due to backlash between the gears meshing with each other. The rotation mechanism according to any one of claims 1 to 5, wherein:   7. The structure according to claim 1, further comprising a sprocket that rotates integrally with the rotating body, wherein the tape can be fed by engaging a tape with an outer peripheral portion of the sprocket. Tape feeder using the described rotation mechanism.

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