JPH0712204A - Gear transmission device - Google Patents

Abstract

PURPOSE:To surely transmit rotation by engaging a driving gear and a driven gear which can be brought in mutual contact separation without generating interference phenomenon of their addendums. CONSTITUTION:In a gear transmission device transmitting rotation by engaging a driving gear 28 mounted on a movable shaft 25 capable of being approached or separated against a driven gear 23 mounted on a fixed shaft 22 with the gear 23, an elastic member 29 elastically deformable in the direction perpendicular to the axial direction is provided riding over supporting members 26, 27 supporting the driving gear 28 and the driving gear 28 between. When the driven gear 23 is engaged with the driving gear 28, if the opposed addendums 23A, 28A are confronted with each other so as to be in the interference state, the driving gear 28 is moved in the direction of separating from the driven gear 23 by elastic deformation of the elastic member 29 in the direction perpendicular to the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driven gear mounted on a fixed shaft, and is arranged so that it can come into contact with and separate from the driven gear, and normally, the meshing with the driven gear is released. More specifically, the present invention relates to a gear transmission including a driving gear that is held in a state, and more specifically, when the driving gear is moved from the separated state to the driven gear side and meshes with the driving gear and the driven gear. The present invention relates to a gear transmission device in which a moving-side drive gear is provided with a retracting means from a driven gear made of an elastic member in order to prevent the occurrence of a phenomenon in which the opposite tooth tips abut against each other and cause poor meshing.

[0002]

2. Description of the Related Art For example, a large number of individual assembling devices such as a component supplying device, a positioning device, various measuring devices or mounting devices are arranged on the same circumference, and at the center of these individual assembling devices. A continuous assembling device in which an index table having a plurality of component suction means positioned therein is rotatably arranged so that each of the component suction means circulates between the individual assembling devices is a relatively small electronic device. It is used as an assembly device or a device for mounting components on a board or the like.

In this continuous assembling apparatus, the components conveyed by the component supply device are sucked by the first component suction means and picked up from the component supply device.
This component is conveyed to the next process by rotating the index table by a predetermined angle while being suction-held by the first component suction means. At this time, the second component suction means sucks and picks up the component conveyed at the position corresponding to the component supply device from the component supply device.

For example, in the second step, the component suction means is rotated by a predetermined angle corresponding to the assembling posture of the suction-held component with respect to the assembly base material, and further, the component recognizing section in the third step suctions the component. After the positional deviation between the held component and the assembly base material is measured, adjustment rotation of a minute angle corresponding to the positional deviation is performed based on the output of the component recognition unit in the fourth step. In this way, the component suction means is appropriately rotated so as to be accurately aligned with the assembly base material, and conveys the component to the assembly base material supply portion, and the component is conveyed in this supply portion. It is mounted on the assembly base material via a mounting device.

When the index table makes one rotation, the first component suction means again moves to the position corresponding to the component supply device and sucks the transported component to pick it up from the component supply device. Thereafter, this operation is sequentially repeated to assemble the electronic device or mount the components on the board continuously. By the way, the component suction means is not held in a fixed posture in a state where it has returned to the position corresponding to the component supply device, because the component rotation is adjusted and rotated by a minute angle as described above. Therefore, in such a continuous assembling apparatus, a return mechanism for returning the component suction means to a fixed posture is disposed around the index table in the preceding stage of the component supply apparatus, that is, as the final step.

As the return mechanism of the conventional component suction means, for example, the one shown in FIG. 10 has been adopted. That is, the suction nozzle 1 as the component suction means is attached to one end of the suction nozzle support shaft 3 supported by the suction head 2, and the suction nozzle gear 4 is attached to the other end of the suction nozzle support shaft 3. It is fixed. The suction nozzle returning mechanism 5 that adjusts the posture of the suction nozzle 1 by rotationally driving the suction nozzle gear 4 is moved by a movable shaft 6 that can be moved toward and away from the suction nozzle support shaft 3 by a drive mechanism (not shown).
A pair of drive gear support members 7A and 7B axially mounted on the movable shaft 6, a drive gear 8 disposed between the drive gear support members 7A and 7B, and a shaft hole portion of the drive gear 8. The drive gear support members 7A and 7B are respectively formed with ball bearings 9 which are installed so as to abut against opposite side surfaces of the drive gear support members 7A and 7B.

The first drive gear support member 7A is fixed on the movable shaft 6 by a set screw 7a, and the second drive gear support member 7A
The drive gear support member 7B is driven by the elastic force of a coil spring 12 that is inserted in a compressed state between the bush 11 that is retained by the nut 10 from the movable shaft 6 and the second drive gear support member 7B. It is pressed against the gear 8 side. Therefore, the drive gear 8 is sandwiched by the drive gear support members 7A and 7B, and when the movable shaft 6 is rotated by the rotation drive mechanism (not shown), the drive gear support members 7 are used as the connecting means.
It rotates integrally with A and 7B.

In the suction nozzle returning mechanism 5 having the above-mentioned structure, the movable shaft 6 has the suction nozzle supporting shaft 3 through the drive mechanism.
The suction nozzle gear 4 is moved closer to the suction side.
And the drive gear 8 mesh with each other to transmit rotation. As a result, the suction nozzle 1 is rotated by a predetermined angle via the suction nozzle support shaft 3, and the stopper pin 4A provided on the suction nozzle gear 4 abuts on a stopper (not shown), whereby the suction nozzle 1 is adjusted in a fixed posture.

[0009]

By the way, in the above-mentioned conventional continuous assembling apparatus, the suction nozzle 1 is held in a constant posture because the suction nozzle 1 is adjusted and rotated by a minute angle by the output of the component recognition section. No, suction nozzle spindle 3
The state of the suction nozzle gear 4 that is integrally rotated via the is also not constant. Therefore, the movable shaft 6 is moved closer to the suction nozzle support shaft 3 side, and the suction nozzle gear 4 and the drive gear 8 are moved.
When the gears are meshed with each other, the tooth tips of the suction nozzle gear 4 and the drive gear 8 are opposed to each other, causing a so-called tooth tip interference phenomenon in which the tooth engagement is not performed. Occasionally, a situation such as the failure to return to

In order to eliminate the interference phenomenon of the tooth tip between the suction nozzle gear 4 and the drive gear 8, for example, the drive gear 8 is replaced with a rubber roller, and the suction nozzle gear 4 is strongly pressed against the suction nozzle gear 4. Although it is also considered to return 1 to the predetermined posture, the problem that not only the abrasion of the rubber roller is great and frequent replacement is required, but also the suction nozzle 1 cannot be accurately returned to the predetermined posture due to the slip phenomenon. There is a point.

Therefore, the present invention is a gear transmission mechanism suitable for use in a suction nozzle returning mechanism or the like in a continuous assembling apparatus, so that rotation transmission can be reliably performed without causing an interference phenomenon of tooth tips. The present invention has been proposed for the purpose of providing a gear transmission device according to the above.

[0012]

A gear transmission according to the present invention, which has achieved this object, transmits a rotational force by engaging a driven gear mounted on a fixed shaft with the driven gear. A drive gear, a support member that is mounted on a movable shaft that is movable in and out of contact with the fixed shaft, and that rotatably supports the drive gear, and an intervening member that extends between the support member and the drive gear. It is composed of an elastic member that is inserted and elastically deformable in a direction orthogonal to the axial direction, and when the movable shaft is moved in a direction approaching the fixed shaft and the driving gear and the driven gear are meshed with each other, When the tooth tips of the drive gear and the driven gear face against each other and come into an interference state, the drive gear moves in a direction away from the driven gear due to elastic deformation of the elastic member in the direction orthogonal to the axial direction. It is characterized by

Further, in the gear transmission according to the present invention, the elastic member, which is interposed between the support member and the drive gear, is provided in the direction orthogonal to the axial direction by providing the slit in the axial direction. It is composed of a roll-shaped elastic member that is elastically deformable, and this elastic member is assembled in a fitting recess provided concentrically with the shaft hole on the side of the support member facing the drive gear and on the peripheral surface of the drive gear. It is characterized by the rotatably mounted shaft.

Further, in the gear transmission according to the present invention, the driven gear is provided with the stopper pin, and the rotation region of the stopper pin is interlocked with the movement of the movable shaft in the direction toward the fixed shaft. Equipped with a stopper facing
The driven gear that is rotationally driven by meshing with the driving gear is characterized by being set to a fixed position in the rotational direction by being rotationally driven to a position where the stopper pin abuts on the stopper.

In the gear transmission according to the present invention, a fixed shaft on which a driven gear is mounted is arranged in the central portion to rotate, and an index table having a plurality of component suction means attached thereto and the periphery of the index table. A supporting member that is configured as a support shaft of the component suction means of a continuous assembling device including a large number of individual assembling devices such as a component supplying device, a positioning device, and a mounting device, and that rotatably supports a drive gear. The movable shaft mounted on the shaft is disposed close to the peripheral surface of the index table located in the preceding stage of the component supplying device of the continuous assembling device, and the driving gear is driven by the movement of the movable shaft toward the fixed shaft side. And the driven gear are engaged with each other to return the driven gear to a fixed position in the rotational direction, thereby setting and returning the component suction means to a fixed posture. To.

[0016]

According to the gear transmission of the present invention configured as described above, the gear distance between the driving gear and the driven gear is maintained by maintaining the axial distance between the fixed shaft and the movable shaft in the normal state. The state has been released. The drive gear rotates integrally with the movable shaft via the support member. As the movable shaft moves closer to the fixed shaft, the drive gear and the driven gear mesh with each other, and the rotation of the drive gear is transmitted to the driven gear. When the driving gear and the driven gear mesh with each other, when the opposing tooth tips abut each other and enter an interference state, the driving gear is
By elastically deforming the elastic member in the direction orthogonal to the axial direction, it moves in a direction away from the driven gear while maintaining the rotating state, the interference state with the driven gear is released, and reliable rotation transmission is achieved. Done.

The slip means formed of a roll-shaped elastic member having a slit in the axial direction is interposed between the drive gear and a support member supporting the drive gear, so that the slip means is separated from the drive gear. When meshing with the driven gear,
When the tooth tips facing each other abut and enter an interference state, they are elastically deformed in the axial direction of the movable shaft to displace the drive gear with respect to the driven gear and release the interference state.

The driven gear that receives the rotation transmission by meshing with the driving gear is rotationally driven to a position where the stopper pin abuts against the stopper, so that the driven gear is set at a fixed position in the rotation direction.

Normally, the movable shaft fixed with the driven gear that is released from the meshing state with the drive gear and is set and rotated to a fixed position depending on the meshing state is configured as a spindle of the component suction means of the continuous assembling apparatus. The component suction means ensures that the driving gear and the driven gear are in mesh with each other without causing interference of the tooth tips to rotate, thereby securely sucking the components set in a fixed posture and supplied. Alternatively, accurate alignment is performed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. The embodiment gear transmission 20 is
As shown in FIG. 1, a fixed shaft 22 that constitutes the driven portion 21.
The driven gear 23 is mounted on the shaft and a drive unit 24 for rotating the driven gear 23 to a predetermined position in the rotation direction.

The drive unit 24 is moved by a drive mechanism (not shown) in a direction approaching or away from the fixed shaft 22 and is driven to rotate, and a shaft that is movable relative to the movable shaft 25. A pair of a first drive gear support member 26 and a second drive gear support member 27 mounted,
The drive gear 28 disposed between the opposing side surfaces of the first and second drive gear support members 26, 27, the elastic member 29 incorporated in the shaft hole portion of the drive gear 28, and the nut 30 are used to move the movable shaft. Bush 3 locked from 25
The coil spring 32 is interposed between the first and second drive gear support members 27 in a compressed state.

A pair of stopper pins 23A and 23B are integrally formed on one side surface of the driven gear 23,
The driven gear 23 is positioned at a predetermined position in the circumferential direction by coming into contact with the stopper 33 protruding into the rotation locus of the stopper pins 23A and 23B as the movable shaft 25 approaches the fixed shaft 22 side, which will be described later. It The first drive gear support member 26 constituting the drive unit 24 is fixed on the movable shaft 25 by the set screw 26A, and is concentric with the shaft hole 26B on the side surface facing the second drive gear support member 27. A large-diameter elastic member fitting recess 26C is provided. The second drive gear support member 27 is formed to have the same diameter as the first drive gear support member 26, and has an elastic member fitting recess 27C concentric with the shaft hole 27B and having a large diameter on the opposite side surface. ing. The elastic member fitting recesses 26B and 27C are formed in the opposite side surfaces of the first drive gear support member 26 and the second drive gear support member 27, respectively, with the same diameter and coaxial with each other.

A cylindrical shaft 27D is integrally formed on the other side surface of the second drive gear support member 27, and a bush 31 is secured to the movable shaft 25 by a nut 30 on the cylindrical shaft 27D. A coil spring 32 inserted in a compressed state is fitted between and. Therefore, the elastic force of the coil spring 32 urges the second drive gear support member 27 toward the first drive gear support member 26 side, and the drive gear 28 is rotatable by the first drive gear support member 26. Sandwich between.

The drive gear 28 has the same diameter as the first drive gear support member 26 and the second drive gear support member 27, and its shaft hole 28A has the elastic member fitting recess 26.
It has the same diameter as C and 27C. The elastic member 29 inserted into the shaft hole 28A of the drive gear 28 is formed of a roll material having an outer diameter in the natural state which is the same as that of the shaft hole 28A, and is orthogonal to the axial direction by providing an axial slit 29A. It is configured to be elastically deformable with respect to the direction. The length of the elastic member 29 in the axial direction is determined by the drive gear 28.
And the depth of the elastic member fitting recesses 26C and 27C are substantially equal.

Therefore, both ends of the elastic member 29 are fitted into the elastic member fitting recess 26 of the first drive gear support member 26.
C and the elastic member fitting recess 2 of the second drive gear support member 27
The drive gear 28 is supported on the outer peripheral portion while being fitted to 7C. As described above, the first drive gear support member 2
6 is fixed to the movable shaft 25 by a set screw 26A, and the second drive gear support member 26 is attached to the second drive gear support member 26.
Since the drive gear support member 27 of is driven by the elastic force of the coil spring 32, the drive gear 28
Rotates integrally with the movable shaft 25.

According to the embodiment gear transmission 20 configured as described above, the movable shaft 25 is rotated counterclockwise in FIG. 1 by the drive mechanism (not shown) and is moved toward the fixed shaft 22 as shown by the arrow. And moved closer. As a result, the drive gear 28 that is assembled to the movable shaft 25 and integrally rotates, and the driven gear 23 that is mounted on the fixed shaft 22.
Are engaged with each other, and the driven gear 23 is rotated clockwise in FIG. The driven gear 23 rotates by a certain angle and then moves closer to the stopper 33 with the movable shaft 25.
When the stopper pin 23A or 23B abuts against, it is stopped at a predetermined position.

When the movable shaft 25 moves toward the fixed shaft 22 and the drive gear 28 meshes with the driven gear 23, as shown in FIG. 2B, the drive gear 28 and the driven gear 23 are engaged. The axes of the teeth 28a and 23a facing each other may abut and collide with each other, resulting in a so-called tooth tip interference state.
From this state, as the movable shaft 25 still moves closer to the fixed shaft 22 side, the drive gear 28 presses the elastic member 29 in the direction orthogonal to the axial direction to elastically deform it.
Due to the elastic deformation of the elastic member 29, which is a shaft support member, the drive gear 28 rotates while moving in a direction away from the driven gear 23, and at the position where the opposing teeth 28a, 23a are out of the interference state, the elastic member The elastic force of 29 meshes with the driven gear 23.

Then, the movable shaft 25 is moved through the drive gear 28.
When the driven gear 23 to which the rotation is transmitted is rotated by a certain angle, as shown in FIG.
When 3A hits the stopper 33, it is stopped at a predetermined position. In the state where the driven gear 23 is stopped, the driving gear 28 moves to the coil spring 32.
The elastic member 29 is slip-rotated on the outer periphery of the elastic member 29 against the elastic force.

As described above, according to the gear transmission 20 of the embodiment, the elastic member 29 is orthogonal to the axial direction even when the tooth tips of the driven gear 23 and the driving gear 28 oppose each other at corresponding positions. Direction is elastically deformed to allow the drive gear 28 to escape from the driven gear 23 in a direction away from the driven gear 23, so that the interference state of the tooth tips is released and the drive gear 28 and the driven gear 23 are released.
And are reliably meshed with each other, and accurate rotation transmission is performed.

The gear transmission 20 of the embodiment configured as described above is, for example, a component suction nozzle of a continuous assembling device used as an assembling device of a relatively small electronic device or a device for mounting components on a board or the like. It is used as a positioning device. In the continuous assembling apparatus shown in FIG. 3, twelve head members 41A to 41L each equipped with five types of suction nozzles, which will be described later, corresponding to the rotating index table 40 are arranged at equal intervals in the rotary unit 35 (see FIG. 6). In addition, the index table 40 is rotatably combined, and individual assembly devices such as a component supply device, a positioning device, and a mounting device that constitute individual assembly processes are arranged around the index table 40. This is a device for performing continuous assembly by selecting an arbitrary suction nozzle and an individual assembling device.

In this continuous assembling apparatus, as shown in FIG. 3, the parts 43 transported to the index table 40 by the parts feeding device 42 in the first step.
Are picked up by the selected suction nozzles of the first head member 41A and picked up by the component supply device 42.
From the first component supply process to the index table 40
In the second step, in which the nozzle has rotated 30 °, the first nozzle drive device 4
4 is arranged as a component mounting direction selection step, and the component 43 for the assembly base material (not shown) is formed.
The suction nozzle selected based on the mounting direction of
It is rotationally driven at any angle of 0 °, 180 ° and 270 °.

The third step in which the index table 40 is rotated 60 ° from the initial position is a component thickness inspection step, in which the thickness dimension of the component 43 sucked by the suction nozzle is inspected, and the index table 40 is initialized. The fourth process rotated 90 ° from the position is a component recognition process, and the type of the component 43 sucked by the suction nozzle is identified.

After these inspection and identification steps, the sixth step in which the index table 40 is rotated by 150 ° from the initial position is the suction nozzle position adjusting step, which is set by the component mounting direction selecting step of the second step. The precise positioning of the suction nozzle is performed by the second nozzle driving device 45. The second nozzle driving device 45 finely adjusts the selected suction nozzle within a range of ± 30 °. In addition,
The fifth step is an empty step, and the details of the first nozzle drive device 44 and the second nozzle drive device 45 are omitted, but the drive gears that mesh with the gears provided on the corresponding suction nozzles. have.

The component 43 precisely aligned in each of the above steps is supplied to the position corresponding to the suction nozzle in the component mounting step which is the seventh step in which the index table 40 is rotated 180 ° from the initial position. It is mounted on an assembly base material (not shown). After making the eighth process an empty process, the ninth process is a defective product discharge process, in which defective products are discharged, and the tenth process is to select a suction nozzle for picking up the next component. It is configured as a process. Index table 40 is 3 from the initial position
The eleventh step rotated by 00 ° is the suction nozzle returning step, and the suction nozzle returning device 54 having the same configuration as the gear transmission 20 described above is provided to return the suction nozzle to the initial position. . Also, the final 12th
Is a suction nozzle confirmation step, and the suction nozzle to be used next is confirmed.
The index table 40 makes one rotation through the above process.

The head member 41, which is rotatably combined with the rotary unit 35 corresponding to the index table 40, has a mounting bracket 4 as shown in FIG.
A head table 49 is rotatably attached to a rotation support portion 48 having a suction valve 47 built into the rotary table 6. Five types of suction nozzles 50A to 50E shown in FIG. 5 are rotatably attached to the head table 49. These suction nozzles 50 are formed such that the tip suction portions have different diameters or heights according to the shape of the component to be sucked, and as described above, the first component supply device 42 is provided. This is selected in the suction nozzle selection step of the tenth step located in the preceding stage of the step.

As shown in FIG. 4, the head table 49 is provided with an outer peripheral gear 49A with which a gear of a head table driving device (not shown) meshes in order to position each mounted suction nozzle 50 in the circumferential direction. Suction nozzle support shafts 51A to 51E of the suction nozzles 50A to 50E, which are located at equal intervals in the circumferential direction, are rotatably rotatably supported and penetrate through the head table 49. The suction nozzle gears 52A to 52E are fixed to one end sides of the suction nozzle support shafts 51A to 51E, and the suction nozzles 50A to 50E are mounted to the other end sides.

For example, in the second component mounting direction selection step, the selected first suction nozzle 50A, for example, rotates by a predetermined angle corresponding to the mounting posture of the suction-held component 43 with respect to the assembly base material. Further, after the positional deviation between the component 43 suction-held in the third component thickness inspection step or the fourth component recognition step and the assembly base material is measured, in the sixth suction nozzle position adjusting step,
Adjustment rotation of a minute angle corresponding to the positional deviation is performed. In this manner, the first suction nozzle 50A is appropriately rotated so as to be accurately aligned with the assembly base material, and is transported to the seventh component mounting step of mounting the component 43 on the assembly base material. Then, in the seventh step, the component 43 is mounted on the assembled base material conveyed by the mounting device.

Further, the first suction nozzle 50A is
In the suction nozzle returning step, the rotation is performed to return to the initial state. However, as described above, in the sixth suction nozzle position adjusting step, the fine angle adjustment rotation is performed for each head member 41. The position is not constant. The interference phenomenon of the tooth tips of the gears that occurs in such a state is prevented by the suction nozzle returning device 54, and
The suction nozzle 50A is surely returned and rotated to the initial position.

The suction nozzle returning device 54 will be described below.
This will be described with reference to FIGS. 6 to 9. The suction nozzle returning device 54 includes a swing plate 55 rotatably supported by a support shaft 55A.
And a cam 56 and a cam lever 5 which swing the swing plate 55 in a direction to move toward or away from the head member 41.
7, a swing plate drive mechanism 60 including a link mechanism 58 and a spring 59, an AC servo motor 61, a pulley 62
And a suction mechanism driving unit 65 and a driving mechanism 64 including a belt 63.

The cam 56 of the swing plate drive mechanism 60 is rotated by a drive mechanism (not shown) in synchronization with the index table 40. A link mechanism 58 that connects a swing plate 55 having a substantially right-angled triangle shape is connected to a cam lever 57 that swings by being brought into contact with the cam 56. The oscillating plate 55 is urged in the clockwise direction in FIG. 6 by a spring 59, and one end of the oscillating plate 55 has a locus of rotation of a stopper pin 53 integrally formed on a side surface of the suction nozzle gear 52 by a oscillating operation described later. A stopper 55B that faces the circle is integrally formed. The AC servo motor 61 is attached to the swing plate 55.
The rotation of the C servo motor 61 is transmitted via a belt 63 to a drive shaft 66 which constitutes a suction nozzle drive unit 65 to which a pulley 62 is fixed.

The drive shaft 66 is rotatably supported by a shaft supporting portion formed integrally with the swing plate 55, and the suction nozzle drive unit 65 including the drive shaft 66 is set on the drive shaft 66 as shown in FIG. The first drive gear support member 67 fixed by the screw 67A and the drive shaft 66 by the key 68A.
A second drive gear support member 68 whose rotation direction is fixed with respect to the first and second drive gear support members 67,
Drive gear 69 inserted between the drive gear 69, elastic member 70 that rotatably mounts the drive gear 69, and nut 7
1, a bush 72 and a coil spring 73. Each of these members forming the suction nozzle drive unit 65 is equivalent to each corresponding member of the gear transmission 20 shown as the first embodiment of the present invention, and the description of the structure and operation will be given later.

The rotation operation of the index table 40 and the operation of the suction nozzle returning device 54 will be described with reference to the time chart shown in FIG. For convenience of explanation, it is assumed that the index table 40 is intermittently rotated after being stopped for a certain period of time in each of the steps described above. As described above, the cam 56 rotates in synchronization with the index table 40. When the index table 40 rotates to a position where the head member 41 reaches the tenth suction nozzle selection step, the cam lever 57 engages with the cam recess of the cam 56. As a result, the regulation of the swing plate 55 in the counterclockwise direction in FIG. 6 via the link mechanism 58 is released, and the swing plate 55 is supported by the elastic force of the coil spring 59.
It rotates clockwise about 5A as a fulcrum.

The suction nozzle is selected in the tenth suction nozzle selection step, and the index table 40 is rotated so as to move the head member 41 from the tenth suction nozzle selection step to the eleventh suction nozzle returning step. Then, the AC servomotor 61 is also activated and the drive gear 69 starts rotating. Then, when the index table 40 is rotated to the position where the head member 41 reaches the eleventh suction nozzle return step, the suction nozzle drive unit 65.
The drive gear 69 and the suction nozzle gear 52 mesh with each other to transmit rotation, and the suction nozzle 50 returns to the initial state. When the fixed time has elapsed, the index table 40 is restarted and the head member 41 is moved to the twelfth suction nozzle confirmation step. Between the eleventh suction nozzle return step and the twelfth suction nozzle confirmation step, A
The operation of the C servo motor 61 is stopped, and the rotation of the drive gear 69 is also stopped.

As shown in FIG. 8, the suction nozzle returning device 54 constructed as described above has the suction nozzle support rotatably provided on the head table 49 of the head member 41 in the eleventh suction nozzle returning step. It is located opposite to the suction nozzle gear 52 fixed to the shaft 51. Elastic member fitting recesses 67B and 68B, which are concentric with the respective shaft holes and have a large diameter, are provided on the opposite side surfaces of the first drive gear support member 67 and the second drive gear support member 68. A tubular shaft 68C is integrally formed on the other side surface of the second drive gear support member 68, and a space between the tubular shaft 68C and a bush 72 that is prevented from coming off from the drive shaft 66 by a nut 71 is provided. A coil spring 73 inserted in a compressed state is fitted in. Therefore, the elastic force of the coil spring 73 causes the second drive gear support member 68 to rotatably sandwich the drive gear 69 with the first drive gear support member 67.

The drive gear 69 has the same diameter as the first drive gear support member 67 and the second drive gear support member 68, and its shaft hole 69A has the elastic member fitting recess 67.
It has the same diameter as B and 68B. The elastic member 70 inserted into the shaft hole 69A of the drive gear 69 is formed of a roll material having an outer diameter in the natural state which is the same as that of the shaft hole 69A, and an axial slit (not shown) is provided so that the elastic member 70 is orthogonal to the axial direction. It is configured to be elastically deformable with respect to the direction of movement.
The length of the elastic member 70 in the axial direction is determined by the drive gear 6
9 is substantially equal to the thickness of the elastic member fitting recesses 67B and 68B.

Both ends of the elastic member 70 are fitted into the elastic member fitting recess 67B of the first drive gear support member 67 and the elastic member fitting recess 68B of the second drive gear support member 68, and at the same time, the outer periphery thereof is fitted. A drive gear 69 is supported on the section. As described above, the first drive gear support member 67 is fixed to the drive shaft 66 by the set screw 67A, and the second drive gear support member 68 is attached to the coil spring 73 with respect to the first drive gear support member 67. Since it is pressed by the elastic force of the drive gear 69,
It rotates together with 6.

Therefore, the suction nozzle returning device 54
According to the above, the drive shaft 66 is rotated by the drive mechanism 64 including the AC servomotor 61, and is moved toward the head table 49 side by the swing motion of the swing plate 55 by the swing plate drive mechanism 60. . As a result, the drive gear 69 assembled to the drive shaft 66 and integrally rotating is engaged with the suction nozzle gear 52 mounted on the suction nozzle support shaft 51, and the suction nozzle gear 52 is rotated. After the suction nozzle gear 52 rotates by a certain angle,
When the stopper pin 53 hits the stopper 55B formed on the swing plate 55, the stopper pin 53 is stopped at a predetermined position. When the suction nozzle gear 52 is stopped by the stopper 55B, the suction nozzle gear 52 slips on the peripheral surface of the elastic member 70 against the acting force of the coil spring 73.

By the way, the drive shaft 66 moves toward the head table 49 side by the swing motion of the swing plate 55,
When the drive gear 69 meshes with the suction nozzle gear 52, the opposing teeth 6 of the drive gear 69 and the suction nozzle gear 52
In some cases, the axes of 9a and 52a collide with each other and collide with each other, resulting in what is called a tooth tip interference state. As the drive shaft 66 still moves closer to the suction nozzle support shaft 51 side from this state, the drive gear 69 presses the elastic member 70 in the direction orthogonal to the axial direction, as shown in FIG. This is elastically deformed. Due to the elastic deformation of the elastic member 70 that is the shaft support member, the drive gear 69 rotates while moving in the direction away from the suction nozzle gear 52, and the teeth 69a, 52 facing each other.
At a position out of the interference state of a, the elastic force of the elastic member 70 meshes with the suction nozzle gear 52.

The drive shaft 66 is driven by the drive gear 69.
When the suction nozzle gear 52 to which the rotation is transmitted is rotated by a predetermined angle, the stopper pin 53 causes the stopper pin 53 to move.
It stops at a predetermined position by hitting against. In the state where the suction nozzle gear 52 is stopped, the drive gear 69 slips on the outer periphery of the elastic member 70 against the elastic force of the coil spring 73.

As described above, according to the suction nozzle returning device 54, even when the opposing teeth 52a and 69a of the suction nozzle gear 52 and the drive gear 69 collide at corresponding positions,
The elastic member 70 elastically deforms in the axial direction orthogonal to the axial direction to release the drive gear 69 in the direction away from the suction nozzle gear 52, so that the interference state between the teeth 52a and 69a is released and these suction nozzles are released. The gear 52 and the drive gear 69 surely mesh with each other to perform accurate rotation transmission, and the suction nozzle 50 is accurately returned to the initial state via the suction nozzle support shaft 51.

In the above embodiment, the drive gear is sandwiched between the pair of drive gear support members. For example, the boss portion of the drive gear is extended in the axial direction and the coil spring is brought into contact with the boss portion. By doing so, the second drive gear support member becomes unnecessary. In addition to the suction nozzle returning device of the continuous assembling device, it goes without saying that it is applied to gear transmission devices of various machine tools and the like.

[0052]

As described in detail above, according to the gear transmission device of the present invention, when the drive gear and the driven gear in the separated state are engaged with each other to transmit the rotation, the teeth of both gears are transmitted. Even if the tips collide with each other to cause an interference phenomenon, the driving gear rotates while the driving gear rotates while the driving gear rotates due to the action of the elastic member that is elastically deformable in the direction orthogonal to the axial direction that rotatably supports the driving gear. When the position of the addendum in the interference state shifts in the direction away from, the elastic force of the elastic member surely meshes with the driven gear, whereby accurate rotation transmission is performed.

Therefore, such a gear transmission device is arranged, for example, in a large number of different individual assembling devices, and the component suction means of the continuous assembling device having the component suction means for sucking the components conveyed by the component supply device is set to the initial position. By using the returning device for returning to, it is possible to perform accurate component suction by the component suction means.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a gear transmission according to the present invention.

FIG. 2 is an explanatory diagram of a meshing operation between a driving gear and a driven gear of the gear transmission.

FIG. 3 is a process explanatory view of a continuous assembling apparatus provided with a gear transmission according to the present invention.

FIG. 4 is a perspective view of a head member provided in the continuous assembling apparatus.

FIG. 5 is a side view of a main part for explaining a suction nozzle mounted on the head member.

FIG. 6 is a schematic configuration diagram illustrating a suction nozzle returning device of the continuous assembling apparatus.

FIG. 7 is a time chart diagram for explaining the operation of the suction nozzle returning device of the continuous assembling apparatus.

FIG. 8 is a vertical cross-sectional view illustrating a suction nozzle returning device of the continuous assembling apparatus, showing a state in which the drive gear and the suction nozzle gear are separated from each other.

FIG. 9 is a vertical cross-sectional view illustrating a suction nozzle returning device of the continuous assembling apparatus, showing a state in which a drive gear and a suction nozzle gear are meshed with each other.

FIG. 10 is a vertical sectional view showing a conventional gear transmission.

[Explanation of symbols]

 20 ... Gear transmission device 21 ... Driven part 22 ... Fixed shaft 23 ... Driven gear 24 ... Drive part 25 ... Movable shaft 26 ... First drive gear support member 27 ... Second drive gear support member 28 ... Drive gear 29 ... Elastic member 32 ... Coil spring 40 ... Index table 41 ... Head member 42 ... Component supply device 43. ..Parts 50 ... Suction nozzle 51 ... Suction nozzle support shaft 52 ... Suction nozzle gear 54 ... Suction nozzle return device 65 ... Suction nozzle drive unit 66 ... Drive shaft 67 ... First drive gear support member 68 ... Second drive gear support member 69 ... Drive gear 70 ... Elastic member 73 ... Coil spring

Claims (4)

[Claims] 1. A driven gear mounted on a fixed shaft, a drive gear for transmitting a rotational force by meshing with the driven gear, and a movable shaft which can be brought into contact with and separated from the fixed shaft. A support member that is mounted axially and rotatably supports the drive gear, and an elastic member that is interposed between the support member and the drive gear and that is elastically deformable in a direction orthogonal to the axial direction. When the movable shaft is moved toward the fixed shaft and the driving gear and the driven gear are meshed with each other, the tooth tips of the driving gear and the driven gear are abutted against each other and interfere with each other. In this state, the drive gear moves in a direction away from the driven gear by elastically deforming the elastic member in a direction orthogonal to the axial direction. 2. The elastic member, which is interposed between the support member and the drive gear, is a roll-shaped member that is elastically deformable in a direction orthogonal to the axial direction by providing a slit in the axial direction. It is composed of an elastic member, and this elastic member is
2. The gear according to claim 1, wherein the support gear is assembled into a fitting recess provided concentrically with the shaft hole on the side facing the drive gear, and the drive gear is rotatably mounted on the peripheral surface. Transmission device. 3. The driven gear is provided with a stopper pin, and is provided with a stopper that faces the rotation region of the stopper pin in association with the movement of the movable shaft in the direction of approaching the fixed shaft. 2. The gear transmission according to claim 1, wherein the driven gear that is rotationally driven by meshing with is set to a fixed position in the rotational direction by being rotationally driven to a position where the stopper pin hits the stopper. . 4. A fixed shaft equipped with a driven gear is arranged in the central portion to rotate and a plurality of component suction means are attached to an index table, and a component supply disposed around the index table. A movable shaft that is configured as a support shaft of the component suction means of a continuous assembling device that includes a large number of individual assembling devices such as a device, a positioning device, and a mounting device, and a supporting member that rotatably supports a drive gear is mounted on the movable shaft. It is arranged close to the peripheral surface of the index table located in the preceding stage of the component feeding device of the continuous assembling device, and the driving gear and the driven gear mesh with each other by the movement of this movable shaft toward the fixed shaft side. 4. The gear according to claim 3, wherein the component suction means is set and returned to a fixed posture by returning the driven gear to a fixed position in the rotational direction. Transmission device.