JP2002310115A - Lock mechanism - Google Patents

Abstract

(57) [Problem] To provide a lock mechanism capable of holding a compact and reliable position. An electronic component mounting apparatus for mounting an electronic component on a substrate positioned by a substrate positioning unit includes:
The lock mechanism 30 that holds the position after the transfer rail 16b is moved in the transfer width direction includes sliding blocks 31A and 31B that slide along a sliding shaft 29, and a sliding block 31B.
A brake plate 35 which is supported by a pin 37 and through which the sliding shaft 29 passes, a spring member 36 which urges the brake plate 35 in the horizontal direction, and a piston 33 which restores the brake plate 35 against the urging force. It consists of. In the position holding state, the urging force of the spring member 36 causes the braking plate 35
The opening end 35b of the insertion hole 35a is pressed by the sliding shaft 29 to cause "galling", whereby the position is fixed with a large holding force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for holding a position of a movable portion that moves along a sliding axis in an electronic component mounting apparatus or the like.

[0002]

2. Description of the Related Art Various types of electronic component mounting apparatuses used in the field of mounting electronic components on a board employ a setup changeover mechanism for accommodating various types of boards. For example, in a transfer width changing mechanism of a transfer rail for transferring a substrate, one or both of the transfer rails are movable in the transfer width direction so that the transfer width can be changed according to the substrate. Further, a lock mechanism is provided for fixing the position of the transport rail so that no displacement occurs after the transport rail is moved.

Conventionally, a lock air cylinder is provided on a transfer rail, and a rod of the air cylinder is pressed against a fixing rail disposed in the width direction of the transfer so that the rod and the fixing rail are connected to each other. The position is maintained by the frictional force of the above.

[0004]

However, the conventional locking mechanism obtains a position holding force by a frictional force. Therefore, if a higher position holding force is required than in the past due to a high-speed operation, the pressing mechanism is pressed. There is no other way but to increase the size of the air cylinder that generates the force, which is contrary to the demand for a compact device.

Accordingly, an object of the present invention is to provide a lock mechanism that can maintain a compact and reliable position.

[0006]

According to a first aspect of the present invention, there is provided a lock mechanism for holding a position of a sliding portion which moves along a sliding shaft at an arbitrary position. A sliding portion that slides, a braking portion that is displaceably disposed in the sliding portion and has an insertion hole through which the sliding shaft is inserted,
There are pressing means for displacing the braking portion in a direction of pressing the insertion hole against the sliding shaft, and pressing releasing means for releasing the pressing state of the insertion hole against the sliding shaft.

According to a second aspect of the present invention, there is provided the lock mechanism according to the first aspect, wherein the braking portion is rotatable about the supporting shaft in a direction orthogonal to the axis of the sliding shaft. The pressing means is a spring member that urges a part of the braking portion in the axial direction, and presses the opening end of the insertion hole against the surface of the sliding shaft by the urging force.

According to a third aspect of the present invention, there is provided the lock mechanism according to the second aspect, wherein the pressing release means is an air cylinder for displacing the brake portion against the urging force of the spring member. .

According to the present invention, the lock mechanism for holding the position of the sliding portion moving along the sliding shaft at an arbitrary position is provided along the sliding shaft connected to the transport rail and arranged in the transport width direction. A sliding part which is displaced in the sliding part, has a through-hole through which a sliding shaft is inserted, and a braking part in a direction in which the inserting hole is pressed against the sliding shaft. By comprising the pressing means for displacing and the pressing releasing means for releasing the pressing state of the insertion hole against the sliding shaft, a large position holding force can be generated with a compact configuration.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a plan view of an electronic component mounting apparatus according to one embodiment of the present invention, FIG. 2 is a front view of a board positioning unit of the electronic component mounting apparatus according to one embodiment of the present invention, and FIG. FIG. 4 is a plan view of a substrate holding unit of the electronic component mounting apparatus according to the embodiment, FIG. 4 is a side view of the substrate holding unit of the electronic component mounting apparatus according to the embodiment of the present invention, and FIG. FIG. 6 is a sectional view of a lock mechanism of the board holding unit of the component mounting apparatus, and FIG. 6 is an operation explanatory diagram of the lock mechanism of the board holding unit of the electronic component mounting apparatus according to one embodiment of the present invention.

First, the structure of the electronic component mounting apparatus will be described with reference to FIG. In FIG. 1, a plurality of tape feeders 4 for supplying electronic components held on a tape are provided in parallel in an electronic component supply unit 3. The tape feeder 4 is mounted on a feeder base (not shown), and moves in the lateral direction by rotating the feed screw 5. The electronic component is supplied to a pickup position by the transfer head by feeding the tape holding the electronic component at a pitch.

A rotary head 6 is provided in front of the supply unit 3. The rotary head 6 rotates in an index around a rotation axis O, and a plurality of transfer heads 7 are mounted on the circumference thereof, and each transfer head 7 has a plurality of suction nozzles. The electronic component is picked up from the tape feeder 4 by the lifting / lowering operation of the transfer head 7 while being located at the pick-up position P of the pick-up station. At this time, by moving the tape feeder 4 laterally with the feed screw 5, a desired electronic component can be picked up.

The transfer head 7 is disposed at an even position on the circumference around the rotation axis O of the rotary head 6, and the transfer head 7 is rotated around its rotation axis by a rotation mechanism. By this rotation, selection of a plurality of suction nozzles provided on the transfer head 7 and setting of the angle of the electronic component held by the suction nozzles in the horizontal rotation direction are performed.

The electronic components picked up at the pickup position P are sequentially moved in the direction of arrow a by the index rotation of the rotary head 6. A height measuring station 8 is provided during the movement. The height measuring station 8 measures the height of the electronic component held by the transfer head 7.

A component recognition station 9 is provided adjacent to the height measuring station 8. The electronic component held by the suction nozzle of the transfer head 7 is imaged from below by a camera (not shown) at the component recognition station 9. Then, by performing image processing on this imaging result,
The dimensions of the electronic component in plan view, that is, the length and width dimensions are detected.

On the front side of the rotary head 6, a substrate positioning section 11 is provided. The board positioning unit 11 positions the board 1 carried in by the carry-in conveyor 12 on the upstream side in the horizontal and vertical directions. Parts recognition station 9
The mounting head 7 that has moved from above reaches the mounting position M of the mounting station located on the substrate 1, and performs an elevating operation there, thereby mounting the electronic component 2 on the substrate 1. The board 1 after the mounting is carried out by the carry-out conveyor 13 to the downstream side.

Next, the structure of the substrate positioning unit 11 will be described with reference to FIG. In FIG. 2, the substrate positioning unit 11
Has a moving table 15 in which an X-axis table 20, a Y-axis table 21 and a Z-axis table 22 are stacked.
On the Z-axis table 22 at the uppermost stage, a substrate holding unit 16 that holds the substrate 1 transferred from the carry-in conveyor 12 is provided. The substrate holding unit 16 has a configuration in which two transfer rails 16a and 16b for transferring the substrate 1 in the X direction and holding the substrate 1 in a horizontal posture are provided on a horizontal elevating base 23.

As shown in FIG. 3, one of the transport rails 1
6a is a fixed rail arranged at the end of the lifting base 23. The transport rail 16b on the other side is fixed to a slider 25 slidably fitted on a guide rail 24 disposed on the lifting base 23 in the Y direction, and is movable in the Y direction. The feed rail 26b has a feed screw 26
The feed rail 26b moves in the Y direction (transport width direction) when the feed screw 26 is rotationally driven by the motor 28.

As a result, in the substrate holding section 16,
The transfer width between the transfer rails 16a and 16b is changed from the maximum transfer width B1 shown in FIG. 4A to the minimum transfer width B shown in FIG.
2, the size can be changed according to the width of the substrate 1 to be mounted. That is, the feed screw 2
The nut 6, the motor 27, and the motor 28 serve as a conveyance width changing unit that changes the conveyance width by moving the conveyance rail 16b, which is a movable part, in the conveyance width direction orthogonal to the conveyance direction.

Next, the lock mechanism 30 for the movable transport rail 16b will be described. The lock mechanism 30 is a position holding unit that holds the position of the transfer rail 16b in the transfer width direction, and is fixed at an arbitrary position corresponding to the transfer width so that the transfer rail 16b does not shift after changing the transfer width. is there.

As shown in FIG. 3 and FIG.
A lock mechanism 30 that slides along two horizontal sliding shafts 29 arranged in the Y direction is coupled to the side surface of b. As shown in FIG. 5A, the lock mechanism 30 constitutes a sliding portion coupled to the transport rail 16b, and the sliding shaft 29
Sliding block 31A, 3 that slides along
1B has a configuration in which element components described below are incorporated.

The sliding block 31A is provided with a cylinder portion 31a and an air hole 31b communicating with the cylinder portion 31a. A piston 33, through which a sliding shaft 29 slidably penetrates, is fitted in the center of the cylinder 31a, and air is supplied into the cylinder 31a through an air hole 31b by an air pipe 32. , Piston 33
Moves in the horizontal direction along the sliding shaft 29 (arrow a).

A housing 31c (FIG. 5B) is formed in the sliding block 31B connected to the sliding block 31A. The housing 31c has a color plate 34 and a braking plate 35 (braking portion). ) Are fitted. The collar plate 34 has an opening 34a into which the protrusion 33a provided on the piston 33 is fitted.
The brake plate 35 has an insertion hole 35a through which the slide shaft 29 is inserted.

The diameter of the insertion hole 35a is set to be slightly larger than the diameter of the sliding shaft 29. When the braking plate 35 is in the upright state, the insertion hole 35a does not contact the sliding shaft 29 as described later. Instead, the insertion hole 35 a is set so as to come into contact with the sliding shaft 29 in a state where the braking plate 35 is inclined at a predetermined angle. Supply air into the cylinder part 31a,
When the piston 33 is moved in the direction of arrow a, the piston 3
Reference numeral 3 applies a horizontal pressing force to the braking plate 35 via the color plate 34.

FIG. 5B shows an A section of FIG. 5A. The braking plate 35 is rotatably supported by a pin 37 provided horizontally in a direction orthogonal to the axis of the sliding shaft 29, and can be rotated around the pin 37. A spring seat 31d is provided above the sliding shaft 29 of the sliding block 31B, and a compression spring member 36 is mounted in the spring seat 31d. Spring member 3
The end of 6 urges the upper part of the braking plate 35 from the side in the horizontal direction (arrow b). This urging force causes the braking plate 35 to rotate around the pin 37 (arrow c). In this rotational displacement, since the upper portions of the brake plate 35 and the color plate 34 are tapered as shown in FIG. 5A, interference occurs when the upper portion of the brake plate 35 contacts the color plate 34. (See FIG. 6B).

Next, referring to FIG.
Will be described. The position holding is a state in which the transfer width is fixed in the substrate holding unit 16, that is, the position of the transfer rail 16b is held in a fixed state. The position holding release is the position fixing of the transfer rail 16b in order to change the transfer width. Is released so that movement in the width direction is permitted.

FIG. 6A shows a state in which the position of the transport rail 16b is not held and the transport width can be changed. That is, in this state, the inside of the cylinder portion 31a is pressurized by supplying air from the air pipe 32, and the piston 33 resists the urging force of the spring member 36 via the color plate 34 by the pressurizing force. To the right. As a result, the right side surface of the braking plate 35 abuts against the inner surface of the housing of the sliding block 31B to be in an upright state, and the sliding shaft 29 inserted through the insertion hole 35a.
a does not contact the braking plate 35. This allows the lock mechanism 30 to slide in a free state along the slide shaft 29.

FIG. 6B shows a state where the position of the transport rail 16b is fixed by the lock mechanism 30.
That is, in this state, the pressurization in the cylinder portion 31a is released, and the pressing of the brake plate 35 by the piston 33 is released. Accordingly, the braking plate 35 is rotated about the pin 37 by the urging force of the spring member 36, and the opening end 35b on the right side of the insertion hole 35a is
Is pressed against the surface of the shaft. Due to this pressing, a biting occurs in which the edge portion of the opening end 35b bites into the shaft surface microscopically, and the relative horizontal movement between the sliding shaft 29 and the braking plate 35 is firmly locked.

In the above configuration, the braking plate 35
The sliding block 31B is a braking unit which is rotatably displaceable and has an insertion hole 35a through which the sliding shaft 29 is inserted. The spring member 36 presses the insertion hole 35a against the sliding shaft 29. Pressing means for displacing the braking plate 35 in the direction in which it is moved. Further, the cylinder part 31a
The air cylinder constituted by the piston 33 and the piston 33 serves as a pressing release means for releasing the pressing state of the insertion hole 35a against the sliding shaft 29 by displacing the braking plate 35 against the urging force of the spring member 36 and restoring. I have.

As described above, in the lock mechanism 30 according to the present embodiment, the brake plate 35 is always pressed against the sliding shaft 29 by the spring member 36 in the normal state in which the position of the transport rail 16a needs to be maintained. Therefore, it has the following excellent features as compared with the lock mechanism conventionally used for holding the position of the transfer rail or the like.

First, a large holding force can be obtained as compared with the locking method in which the rod of the cylinder is projected and pressed against the fixed rail to hold the position by frictional force. That is, in the present embodiment, since the opening end 35b of the braking plate 35 is pressed against the surface of the sliding shaft 29 to generate "galling", the pressing force is smaller than a simple frictional force. A large position holding force can be generated by the generation source, and simplification and compactness of the mechanism are realized.

Also, in comparison with a similar lock mechanism that holds the position by clamping the sliding shaft from the periphery, the lock mechanism 30 according to the present embodiment always slides with the spring member 36 in the position holding state. The dynamic shaft 29 is in a clamped state, and there is no need for relative sliding of the contact portion between the braking plate 35 and the sliding shaft 29 when the clamping force is generated. That is, since the locking mechanism 30 is a mechanism that actively generates a clamping force, the sliding shaft 29
There is no displacement of the holding position which occurs in a passive clamping mechanism in which a clamping force is generated due to the occurrence of a minute relative slip between the position and the position, and the position holding accuracy is excellent.

[0033]

According to the present invention, the position holding means for holding the position of the transfer rail in the transfer width direction is slid along the slide shaft connected to the transfer rail and arranged in the transfer width direction. A moving portion, a braking portion provided with an insertion hole through which the sliding shaft is inserted so as to be displaceable in the sliding portion, and pressing means for displacing the braking portion in a direction of pressing the insertion hole against the sliding shaft; Since it is composed of the pressing release means for releasing the pressing state of the insertion hole against the sliding shaft, a large position holding force can be generated by a simple and compact mechanism.

[Brief description of the drawings]

FIG. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of a board positioning unit of the electronic component mounting apparatus according to the embodiment of the present invention;

FIG. 3 is a plan view of a board holding unit of the electronic component mounting apparatus according to the embodiment of the present invention;

FIG. 4 is a side view of the board holding unit of the electronic component mounting apparatus according to the embodiment of the present invention;

FIG. 5 is a cross-sectional view of a lock mechanism of the board holding unit of the electronic component mounting apparatus according to one embodiment of the present invention.

FIG. 6 is an explanatory diagram of an operation of a lock mechanism of a board holding unit of the electronic component mounting apparatus according to one embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 11 Substrate positioning part 16 Substrate holding part 16a, 16b Transport rail 29 Sliding shaft 30 Lock mechanism 31A, 31B Sliding block 33 Piston 35 Brake plate 36 Spring member

Claims (3)

[Claims] 1. A locking mechanism for holding a position of a sliding portion moving along a sliding axis at an arbitrary position, comprising: a sliding portion sliding along the sliding axis; A braking portion provided so as to be displaceable and having an insertion hole through which the sliding shaft is inserted, pressing means for displacing the braking portion in a direction in which the insertion hole is pressed against the sliding shaft, and sliding of the insertion hole. A lock release mechanism for releasing a pressing state against the shaft. 2. The braking portion is rotatably fixed to the sliding portion so as to be rotatable around a support shaft in a direction orthogonal to an axis of the sliding shaft,
The pressing means is a spring member for urging a part of the braking portion in the axial direction, and the urging force presses the opening end of the insertion hole against the surface of the sliding shaft. Item 2. The lock mechanism according to Item 1. 3. The lock mechanism according to claim 2, wherein said pressing release means is an air cylinder for displacing the braking portion against a biasing force of the spring member.