JPS6327949Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device for temporarily positioning and holding pallets at predetermined positions on the guide rails in a pallet changer using guide rails.

[Prior art]

Pallet changer 3 shown in Figures 1 and 2
Pallet temporary positioning device 50, 5 of the present invention from 0
5 is a conventional pallet changer, which consists of a first arc-shaped guide rail 32 provided on the machine tool 15 and a second arc-shaped guide rail 33 provided on the movable base 21. and a rotating arm 31 provided between these, which are positioned and supported at predetermined positions by a first guide rail 32 in a standby position and a second guide rail 33 indexed at a position opposite thereto. Palette 4
0 and 40 are engaged with both sides of the swing arm 31, the positioning is released before and after this, the swing arm 31 is turned, and the pallets 40 and 40 are mutually exchanged.
Connect each pallet 40, 40 to pin 65 or rod 23
The table 17 and the movable pedestal 21 are positioned by engagement with the reference hole 40a or 40b. The engagement and disengagement between the rotating arm 31 and each pallet 40 is achieved by attaching a pallet hook 4 to each pallet 40.
1, a pallet 40 and a rotating arm 3.
1 and 3 in the vertical direction relative to each other in the vertical direction.
This is done by engaging and disengaging the claw portion 31a of the pallet hook 41 from the pallet hook 41.

[Problem that the invention attempts to solve]

In such a conventional pallet changer,
Palette hook 41 and claw part 3 due to vertical movement
In order to enable connection and disconnection with 1a, both 41 and 3
A certain amount of clearance is required between 1a, and due to the play caused by this clearance, when the pallets 40 are replaced by the rotating arm 31, each pallet 4
0 cannot be accurately positioned in a predetermined position. For this reason, when positioning after replacing the pallet 40, the positioning pin 65 or rod 23 is not necessarily inserted smoothly into the reference hole 40a or 40b, resulting in strain. There were problems with deformation and damage. The present invention eliminates the above problem by temporarily positioning the pallet 40 at a predetermined position by elastically engaging the pallet 40 with the guide rails 32, 33.

[Means for solving problems]

For this reason, in the pallet positioning device according to the present invention, in this type of pallet changer 30, the pallet 40 is placed at a predetermined position on the first and second guide rails 32, 33 as shown in FIGS. 1 and 3. Positioning members 23, 65 for main positioning
Reference holes 40a and 40b that engage with the positioning members 23 and 65 are provided on the lower surface of the pallet 40, and at least one of the first and second guide rails 32 and 33 has an engaging member that is inclined at the tip. Amen 51
The temporary positioning member 51 having a
a is the surface 32a, 33 of the guide rail 32, 33
A spring 52 is provided so that the temporary positioning member 51 can be retracted and retracted from the inside of the pallet 40 at a predetermined position on the inner surface 40c of the pallet 40 facing the surfaces 32a and 33a. A recess 42a that elastically engages with the inclined engagement surface 51a is provided.

[Effect]

Since each pallet 40 is located near a predetermined position when replaced by the rotating arm 31,
The inclined engagement surface 51a at the tip of the temporary positioning member 51 provided on the guide rails 32, 33 at least partially engages with the recess 42a of the pallet 40. Since this engagement surface 51a is urged outward by the spring 52, that is, toward the recess 42a,
Due to the action of the inclined engagement surface 51a, the pallet 40
moves somewhat on the guide rails 32, 33, and the recess 42a matches the temporary positioning member 51. As a result, the pallet 40 is elastically temporarily positioned at a predetermined position, and then the positioning member 6 is inserted into the reference holes 40a, 40b.
5 and 23 engage with each other, the pallet 40 is finally positioned.

[Effect of idea]

As mentioned above, according to the present invention, the pivot arm 31
Pallet 4 has been moved to a predetermined position by
0, the engagement surface 51a and the recess 42a are elastically engaged and temporarily positioned, so the reference hole 40a or 4
The positioning pin 65 or rod 23 can be inserted into the position 0b easily, and the pin 65 or rod 23
And the reference holes 40a, 40b will not be deformed or damaged.

〔Example〕

1 and 2, the pallet changer 30 is a rotating arm 31 provided on the machine frame 10.
, an arcuate first guide rail 32 provided on the table 17 of the machine tool 15 , a second guide rail 33 provided on the movable base 21 of the pallet pool 20 , and a circular guide rail 32 provided on the machine frame 10 . It consists of an arcuate intermediate guide rail 34. Each of the guide rails 32, 33, and 34 guides and supports a pallet 40 on which a workpiece (not shown) is attached so as to be movable along its circular arc direction. A pallet hook 41 is provided on the arc center side of each pallet 40 to engage with the claw portion 31a of the rotating arm 31.

The first guide rail 32 is supported on the table 17 so as to be movable up and down by a cylinder device 61 of a clamp device 60, and guides and supports the pallet 40 via rollers 32b and 32c. table 1
A reference member 62 and a positioning pin (positioning member) 65 are fixed on the top of the pallet 7, and when the first guide rail 32 is lowered while supporting the pallet 40 in a predetermined position, the pallet 40 will be placed in the reference hole 40a on the lower surface. The positioning pin 65 is inserted and comes into contact with the reference member 62 to be properly positioned on the table 17 and clamped. In this state, the table 17 moves on the bed 16 in the Y direction, and the workpiece on the pallet 40 is machined by the machine body 18 moving in the X direction. When the first guide rail 32 and pallet 40 are raised by the cylinder device 61 (see the two-dot chain line B in FIG. 1),
The positioning pin 65 is disengaged from the reference hole 40a, and the pallet 40 becomes movable in the arcuate direction of the first guide rail 32. The pallet 40 is replaced by the rotating arm 31 while the table 17 is placed in the standby state shown in FIG. 2 and the first guide rail 32 is raised. The pallet pool 20 consists of a movable base 21 and a rotary plate 22, which are rotatably supported on the machine frame 10 by rollers 28, 29, and 29a. Guide rail 33
to be fixed. The movable pedestal 21 is driven by an indexing drive device (not shown), and sequentially indexes the second guide rail 33 to a position facing the first guide rail 32 in a standby state. The first guide rail 32 in a standby state, the indexed second guide rail 33, and the intermediate guide rail 34 are arranged in a ring shape, as shown in FIG. The pallet 40 has rollers 33b, 33
The spring 2 is guided and supported by the second guide rail 33 via the reference hole 40b on the lower surface.
Positioning is performed by inserting the tip of a positioning rod (positioning member) 23, which is urged upward by the positioning rod 4. However, the indexing rod 26 provided on the machine frame 10 is raised by the indexing cylinder device 27 and the movable base 2
1, the intermediate arm 2
The positioning rod 23 of the second guide rail 33, which is indexed to a position opposite to the first guide rail 32 via the guide rail 5, is lowered to allow the pallet 40 to move in an arcuate direction.In this state, the pallet 40 cannot be replaced. It will be done.

As shown in FIG. 2, at the center of each guide rail 32, 33, 34 arranged in an annular manner, a vertical rotating shaft 37 having a swing arm 31 fixed to its upper end is provided. As shown in FIG. 1, the rotating shaft 37 is coaxially supported by a piston 36a of an elevating cylinder device 36 provided in a casing 35 fixed to the machine frame 10, and moves up and down together with the piston 36a, while the pinion 37a at the lower end is easily moved. It is connected to a rotating cylinder device 39 via a shaft 38. The swing arm 31 is raised and lowered by the lifting cylinder device 36 to engage with and disengage from each pallet 40, and does not engage with each pallet 40 in the raised state (see the two-dot chain line A in FIG. 1), but in the lowered state. (See the solid line in FIG. 1), the claws 31a on both sides hold the pallet hook 41 of the pallet 40 positioned and supported on the indexed second guide rail 23 and the first guide rail 32 raised in the standby position, respectively. engage with. In this state, the turning cylinder device 39 is operated to turn the turning arm 31, and the pallets 40 on the first guide rail 32 and the second guide rail 33 are transferred.

Pallet temporary positioning devices 50, 55 according to the present invention are provided between the first and second guide rails 32, 33 and the pallet 40, respectively. Temporary positioning device 5 between the second guide rail 33 and the pallet 40
5 includes a temporary positioning member 51, a spring 52, and a recess 42a, as shown in FIGS. 1 and 3. The temporary positioning member 51 has a conical inclined engagement surface 51a at the tip, and this engagement surface 51a
The guide hole 33 of the second guide rail 33 is formed so that it can freely protrude and retract from the upper surface 33a of the guide rail 33.
d and is biased upward by a spring 52 interposed between the support plate 53 and the support plate 53 provided on the second guide rail 33. The recess 42a has a conical shape that engages with the engagement surface 51a, and the pallet 40
It is provided on the lower inner surface 40a, and its setting position is when the pallet 40 is in a predetermined position.
The position is such that it elastically engages with the engagement surface 51a of the temporary positioning member 51 biased by the spring 52. The recess 42a is formed in a block 42 provided on the lower side of the pallet 40.

The positioning device 50 between the first guide rail 32 and the pallet 40 has a slightly different shape from the positioning device 55, but the structure is the same, so the same parts are given the same reference numerals and detailed explanation will be omitted. Note that the positioning devices 50 and 55 are connected to each guide rail 32 and 3.
There are two sets in each section, and only one of them is shown in FIG.

Since there is a considerable gap between the claw portion 31a of the rotating arm 31 and each pallet hook 41 for engagement and disengagement, when each pallet 40 is replaced by the rotating arm 31, it can move freely within the range of play caused by the gap. It takes a certain position and cannot be determined precisely. However, the pallet 40 is positioned to such an extent that the recess 42a at least partially engages with the engagement surface 51a of the temporary positioning member 51. Conical engagement surface 51
Since a is urged toward the conical recess 42a by the spring 52, it is within the range of the play due to the action of a pair of mutually engaging conical surfaces that tend to become concentric when pressed together. Each pallet 40 has a first guide rail 32 and a second guide rail 33.
The recessed portion 42a stops concentrically with the engaging surface 51a, and as a result, each pallet 40 is temporarily positioned at a predetermined position on each guide rail 32, 33. In this state, if the first guide rail 32 is lowered by the cylinder device 61, the reference hole 40a will be inserted into the positioning pin 65 without any force.
Moreover, if the positioning rod 23 is raised by the indexing cylinder device 27, it can be inserted into the reference hole 40b without difficulty. Note that before engaging the claw portion 31 and the pallet hook 41, the pallet 40 and the positioning rod 23
Or, if the engagement with the positioning pin 65 is released, the pallet 40 will inadvertently slide into the first and second guide rails 3.
2, 33, and then the rotating arm 31
However, according to the present invention, each pallet 40 is connected to the first and second guide rails 3.
2 and 33, there is no possibility of inadvertent movement, and the above-mentioned problem does not occur.

In the above embodiment, the positioning devices 50 and 55 of the present invention are connected to the first and second guide rails 32 and 33.
Although it was used for both, it can also be used for either one.

In addition, the inclined engagement surface 5 of the temporary positioning member 51
1a is not limited to a conical surface as in the above embodiment, but may be a spherical or arcuate surface, or a roller may be used.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view including related devices, and FIG. 3 is an enlarged sectional view of the main parts. Explanation of symbols, 10...Machine frame, 15...Machine tool, 21...Movable base, 23, 65...Positioning member, 30...Pallet changer, 31...Swivel arm, 31a...Claw portion, 32...First guide rail, 32a...Surface, 33...Second guide rail, 33a...Surface, 37... Rotating shaft, 40...
...Pallet, 40a, 40b...Reference hole, 40c
...Inner side, 41...Paretstovtsk, 42a...
Recessed portion, 51...temporary positioning member, 51a...engaging surface, 52...spring.

Claims (1)

[Scope of utility model registration request] a rotating arm that is pivotally supported on a machine frame via a vertical rotating shaft and is driven to rotate; a first guide rail that is provided in a processing device such as a machine tool and has an arcuate shape concentric with the rotating shaft in a standby state; an arc-shaped second guide rail indexed to a position facing the first guide rail provided on the movable base and in a standby state and continuous with the first guide rail in an annular shape; The pallet guided and supported by a guide rail and positioned at a predetermined position and the pivoting arm are moved relative to each other in the vertical direction to engage the claws of the pivoting arm and the pallet hook of the pallet, and by pivoting the pivoting arm. In a pallet changer that transfers a pallet that has been positioned and supported on one of the guide rails to a predetermined position on the other guide rail, the pallet is actually positioned at a predetermined position on the first and second guide rails. A positioning member is provided, a reference hole that engages with the positioning member is provided on the lower surface of the pallet, and at least one of the first and second guide rails is provided with a temporary positioning member having an engaging surface inclined at the tip thereof. The engagement surface is provided so as to be freely protrusive and retractable from the surface of the guide rail, and a spring is provided for urging the temporary positioning member outward, and the inner surface of the pallet facing the surface is provided with a spring that urges the temporary positioning member outwardly. A pallet positioning device comprising a recess that elastically engages with an engagement surface.