JPH0751238Y2 - Pallet carrier - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet carrier for loading and unloading a pallet on which a work is mounted, and moving the pallet along a front surface of a plurality of machine tools to transfer the pallets to and from the machine tool.

[0002]

2. Description of the Related Art Conventionally, a plurality of pallet trucks 101 are arranged in parallel as shown in FIG.
02, an independent pallet changer 103 is provided on the front side of each of the 02.
It is designed to move further along the front side. Each pallet changer 103 includes two sets of pallet transfer devices using cylinders or the like for pallet exchange with the work table 104 of the machining center 102 and pallet exchange with the pallet carrier 101. On the other hand, Japanese Patent Laid-Open No. 60-240564 discloses a machine tool.
The trolley that moves along the front of the
A pair of guide rails that guide the pallet in the direction
2 pairs are installed side by side in the moving direction of, and between this pair of guide rails,
The storage position on the carriage and the protrusion on the work table of the machine tool
Moves back and forth in the direction perpendicular to the moving direction of the dolly from the exit position
In addition, the engagement / disengagement moving mechanism slightly moves in the moving direction of the carriage.
Reciprocates to selectively engage with the engaged part on the side of the pallet
Providing a pallet transfer device with a locking member that engages and disengages
In the middle of the inner rail pair,
And the pallet on one of the guide rails
Position the locking member in the neutral position, and project from that position
Then, at the protruding position, move the carriage slightly in one direction.
Move to engage the engaged part on the side of the pallet on the work table.
And then move backward to take out the pallet onto the trolley,
Palais pulled out by a pallet fixing device separately provided in the car
Fixed the dolly to the dolly and then the other direction of movement of the dolly.
Move the locking member to and pull out the pallet and the locking member.
Of the pallet on the guide rail
Engage with the joint and move it forward to move the pallet to the work table.
What is provided on the file is disclosed.

[0003]

According to the former prior art, since each of the machining centers 102 has a pallet changer 103, the machining center 102 is provided.
Requires a large installation space in front of the machine, the width of the processing line is wide, and the equipment cost is high. Meanwhile, after
In the prior art of the person, the traveling carriage is a pallet transfer device.
Since it is equipped with, it is like the former technology for each machine tool
It does not require a pallet changer to reduce the processing line width.
And the equipment is cheaper than the former technology.
Although there is an advantage that can be done, between the engaged part of the pallet and the locking member
Engagement / disengagement
Because it moves back and forth to engage and disengage,
There is a problem that requires only a special engagement and disengagement moving mechanism,
There was a problem that the structure became complicated. Also, in the latter one,
A separate pallet fixing device is used to fix the pallet to the trolley.
A set (positioning pin) is provided for each guide rail pair.
Needs a drive source (cylinder) for that.
There was also a problem.

[0004]

SUMMARY OF THE INVENTION The present application relates to a pallet and a lock.
For engaging and disengaging the members, a dedicated engaging and disengaging mechanism as in the conventional technology
No moving mechanism is required, and moreover, on the pallet guide rail
Dedicated device for positioning the pallet integrally with the carrier body
To provide a pallet carrier that is not needed for
The main body of the carrier that moves along the front of multiple machine tools
, Guide the pallet in the direction orthogonal to its moving direction
Two pairs of pallet guide rails are installed side by side in the moving direction,
A locking member that engages and disengages with the
A set of patrols for horizontal movement along the guide rails.
The pallet transfer device allows the pallet to move to the storage position of the locking member.
Position on the pallet guide rail corresponding to
Between the corresponding position on the work table of the machine tool
For pallet trucks that are designed to be moved,
The transfer device is compatible with two pairs of pallet guide rails.
Provided, the locking member of each pallet transfer device and the pallet,
When the pallet is in the position on the work table, the locking member is
When it is in the protruding position, the pallet on the machine tool
Both by the lifting movement of the pallet by the clamp cylinder
The pallet on the pallet guide rail
When the locking member is in the retracted position,
The feature is that they are associated so as to maintain the state .

[0005]

The pallet carrier for loading and transporting pallets has two sets of pallet guide rails and the pallet transfer device for transferring pallets to and from machine tools. Pallets can be exchanged directly with machine tools. Take the pallet on the work table
In order to take it out, when the locking member is located at the protruding position,
By raising the pallet to the unclamp position,
Of the pallet carrier and the locking member are engaged.
When the tray is supplied on the work table, the work table
Lowering the pallet to clamp it to the cable,
The pallet is disengaged from the locking member. Pallet and locking part
Lifting and lowering with a pallet clamp cylinder for engaging and disengaging materials
Since it uses movement, there is no dedicated mechanism for engaging and disengaging.
It is important. Also, place the locking member in the retracted position and the pallet
If there on the toilet guide rail Kiniwa, it is constantly locking member
Since it is locked to the pallet, the locking member
It also serves as a positioning member that is integrated with the main body of the transport vehicle,
No separate positioning member is required.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a plurality of machining centers (machine tools) 1 and 2 are arranged in parallel to form one processing line. In the machining center 1, a work table 4 is fixedly installed on a bed 3 as shown in FIG. On the work table 4, a pallet retainer 5 whose front is formed on a guide rail 5a is provided with a vertical guide bar (not shown) to prevent it from rotating in the horizontal direction so as to be movable in the vertical direction. The pallet presser foot 5 is connected to the piston rod 6a of the clamp cylinder 6 in the work table 4. Positioning pins 8 that engage with and disengage from positioning holes 7a on the lower surface of the pallet 7 are fixed on the work table 4.

In front of the processing line, as shown in FIG.
A frame 10 in which a mold channel material is appropriately welded is linearly arranged along the machining centers 1 and 2. On the frame 10, a base 11 having a U-shaped cross section is welded over the entire length of the frame 10. 1 on the base 11
A pair of rail mounting plates 12 and 13 are welded over the entire length of the base 11. A track 14 is fixed on each rail mounting plate 12, 13 over the entire length of the base 11. A rack 15 is provided on the rail mounting plate 12 in parallel with the track 14.

A guide unit 20 guided on the track 14.
On the left and right sides of the lower surface of the carrier body 21, the unit mounting plates 22 are fixed to the front and rear and the middle thereof. The guide unit 20 has a built-in circulating bearing row, and performs rolling guide by bearings between the guide unit 20 and the raceway 14. A speed reducer 23 is fixed on the carrier body 21, and a pinion 25 meshing with the rack 15 is key-connected to an output shaft 24 of the speed reducer 23. A traveling servomotor 26 is attached to an upper portion of the speed reducer 23, and the pinion 25 is rotated by the rotation of the traveling servomotor 26, so that the carrier body 21 moves along the machining centers 1 and 2. There is.

On the carrier main body 21, two pairs of left and right pallet guide rails 30 are arranged side by side in the moving direction of the carrier main body 21. As shown in FIG. 4, each pallet guide rail 30 includes a support piece 3 that is raised from the carrier body 21.
A rail member 32 is fixed to the upper end of the rail 1 in a direction perpendicular to the moving direction of the carrier body 21.

Between the pair of left and right pallet guide rails 30, mounting brackets 35 of the pallet transfer device 40 are fixedly attached to the rear upper surface of the carrier body 21. The pallet transfer device 40, as shown in FIG.
A rotating shaft 42 is rotatably supported by a casing 41 integrally fixed to the casing. The rotary shaft 42 is attached to the lower portion of the casing 41, and is connected to a flexspline 44a of a known harmonic drive (registered trademark) 44 that is decelerated by the rotation of the servomotor 43. Casing 41
A first sprocket 45 is welded to the upper end of the. First
A flange member 46 is spline-fitted to the rotary shaft 42 extending upward through the center of the sprocket 45, and the flange member 46 is integrally fixed to the base of the first arm 50.

A third sprocket 51 is welded to the upper surface of the front end of the first arm 50, and a first sprocket shaft 53 integrally provided with a second sprocket 52 at the lower end penetrates the third sprocket 51 and is freely rotatable. Supported by. First
The upper end of the sprocket shaft 53 is integrally fixed to the base end of a second arm 54 having the same length as the first arm 50. A second sprocket shaft 56 integrally provided with a fourth sprocket 55 is rotatably supported at the tip of the second arm 54.
Chains 57 and 58 are wound between the first and second sprockets 45 and 52 and between the third and fourth sprockets 51 and 55, respectively. The rotation ratio between the first sprocket 45 and the second and third sprockets 52 and 51 is set to 1: 2, and the rotation ratio between the third sprocket 51 and the fourth sprocket 55 is set to 2: 1.

An L-shaped bracket 60 is fixed to the upper end of the second sprocket shaft 56. At the lower end of the bracket 60, as shown in FIG. 4, a locking pin (locking member 63) that engages and disengages with the two locking holes 62 of the locking block 61 attached to the rear end of the pallet 7 is projected downward. ing.

A positioning dog 65 is fixed to the front surface of the carrier body 21 in front of the pallet transfer device 40. A detection switch 66 for detecting the positioning dog 65 is provided so as to project forward from the bed 3 of the machining centers 1 and 2. Limit switches 67 for confirming the presence or absence of pallets are mounted on the carrier body 21 in correspondence with the pair of pallet guide rails 30. Then, the detection switch 66 preferentially detects the positioning dog 65 on the side without the pallet 7 by the signal from the limit switch 67, stops the traveling servomotor 26, and removes the pallet 7 from the machining center 1. The carrier body 21 is moved to the side where the pallet 7 is present, the positioning dog 65 on the side where the pallet 7 is present is detected, and the servomotor 26 is stopped.

In FIG. 2, the pallet carrier C in the standby position A places the pallet 7 on which the unworked work is placed on one pallet guide rail 30 (upper side in FIG. 2), and its locking block 61 is The pallet transfer device 40 is locked with a locking pin 63 (in a storage position described later) of the pallet transfer device 40.
Therefore, the pallet 7 is locked by the locking pin 63,
It is positioned integrally with the main body 21, and in the present application, it is conveyed.
A separate positioning device for the pallet 7 is required on the car body 21.
do not do. At this time, the pallet 7 is not placed on the other pallet guide rail 30. When the work of the pallet 7 on the work table 4 of the machining center 1 is completed, the servo motor 26 of the pallet carrier C at the standby position A
Rotates, and the pallet carrier C travels due to the meshing of the pinion 25 and the rack 15. The detection switch 66 detects the positioning dog 65 on the side of the pallet carrier C on which the pallet 7 is not mounted, stops the carrier C, and the pallet guide rail 30 on which the pallet 7 is not mounted and the guide rail 5a of the machining center 1 are mounted. Face each other. Servo motor 43 of corresponding pallet transfer device 40 rotates clockwise, first sprocket shaft 53 rotates counterclockwise, and folding position B in which first and second arms 50 and 54 are vertically stacked.
(The position of the locking pin 63 at this time is the storage position) and extends forward. As described above, the first sprocket 4
5, the rotation ratio of the second sprocket 52 is 1: 2, the swing angle of the second arm 54 is twice that of the first arm 50, and the lever ratio of the first and second arms 50, 54 is 1: 1. Therefore, the second sprocket shaft 56 of the second arm 54 moves on the straight line L orthogonal to the moving direction of the carrier C.

When the second arm 54 rotates in this manner, the chain 58 wound around the third and fourth sprockets 55 rotates the second sprocket shaft 56 in the clockwise direction, and the swing angle thereof is the third and fourth sprockets. From the rotation ratio of 51, 55 is 2:
Since it is 1, the bracket 60 fixed to the second sprocket 56 moves forward and backward while maintaining the directionality at the folding position.

The locking pin 63 at the lower end of the bracket 60 is
The protruding position located above the locking hole 62 of the locking block 61 of the pallet 7 on the work table 4 (indicated by the chain double-dashed line in FIG. 1)
When the position (shown) is reached, the rotation of the servo motor 43 is stopped. Next, the pallet 7 is lifted by the clamp cylinder 6. When the pallet presser foot 5 and the pallet guide rail 30 of the pallet carrier C are at the same height, the locking pin 63 fits into the locking hole 62. In this state, the positioning of the pallet 7 on the work table 4 has been released, so this time, the servo motor 43 is rotated in the opposite direction to the above, the locking pin 63 is horizontally moved to the storage position, and the pallet 7 is palletized.
Take out onto the pallet guide rail 30 of the carrier C. Pa
The pallet 7 taken out on the let guide rail 30 is
Since it remains engaged with the locking pin 63 in the retracted position,
It should be positioned on the transport vehicle body 21 by the locking pin 63.
Becomes After taking out the pallet 7 in this way, the servo motor 26 for traveling is rotated to make the pallet 7 on which the unworked work is placed face the work table 4, and the first and second arms 50, 54 are extended in the same manner as described above. Then, the pallet 7 on which the unprocessed work is placed is supplied onto the pallet presser foot 5 of the machining center 1. The pallet presser foot 5 supplied with the pallet 7 is lowered and positioned by the clamp cylinder 6, and the locking pin 63 is disengaged from the locking hole 62. Then, the first and second arms 50 and 54 are returned to the folding position B.
As described above, in the present application, the engagement pin 63 and the engagement hole 62 are disengaged from each other.
When the locking pin 62 is in the protruding position, the pallet
It is carried out by using the lifting motion of the clamp cylinder 6 of 7.
As a result, a special mechanism is required to engage and disengage both.
The mechanism can be simplified compared to the conventional one.

In this embodiment, two pallet transfer devices 40 are provided.
Since it has two arms and extends from the folding position, the installation space in front of the machining centers 1 and 2 is extremely small.

[0018]

As described above, according to the device of this invention,
Pallets can be changed directly from a pallet carrier to a large number of machine tools installed side-by-side, so there is no need for a pallet changer for each machine tool, there is no facility cost, and there is no need for a large installation space in front of the machine tools. There is. Only
Also, in the device of the present application, the locking member at the protruding position with the pallet
Clamp cylinder of the pallet on the machine tool side for engaging and disengaging
Since it uses the up and down movement by
Since the mechanism of is not required, the mechanism can be simplified.
It Moreover, it is located on the pallet guide rail of the carrier body.
The locking member in the storage position is constantly locked on the pallet.
Therefore, a separate pallet positioning device is installed
Even if you do not have
It can be positioned on the main body of the vehicle and must have a drive source for positioning.
There is no need, and control etc. becomes simple.

[Brief description of drawings]

FIG. 1 is a plan view of a pallet carrier .

FIG. 2 is a layout diagram with a machine tool .

3 is a sectional view taken along line III-III in FIG .

4 is a sectional view taken along line IV-IV in FIG .

FIG. 5 is a vertical sectional view of a pallet transfer device .

[6] Der layout diagram of a conventional processing line
It

[Explanation of symbols]

1, 2 machining center, 4 work table, 6 clamp cylinders, 7 pallets, 21 pallet carrier body, 30 pallet guide rail, 40 pallet transfer device, 63 locking pin (locking member), C pallet carrier

Claims (1)

[Scope of utility model registration request] 1. A pallet is mounted in a direction orthogonal to a moving direction of a carrier body that moves along a front surface of a plurality of machine tools.
Two pairs of pallet guide rails for guiding are installed side by side in the moving direction,
The locking member that engages and disengages with the pallet is
To move horizontally along the pallet guide rail between
With the pallet transfer device equipped, the pallet can be locked
The position on the pallet guide rail that corresponds to the storage position of
Position on the work table of the machine tool that corresponds to the protruding position
Husband in the pallet truck to move the pallet transfer device to two pairs of pallets guide rails between
The pallet transfer device's locking member and
And the pallet at the position on the work table,
When the locking member is in the protruding position, it is installed on the machine tool.
Lifting movement of pallet by pallet clamp cylinder
Both are engaged and disengaged by the
Position when the locking member is in the retracted position.
A pallet transport vehicle characterized by being associated with a person so as to maintain an engaged state .