JPH0627313Y2 - Work conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a work conveyor that conveys a pre-processed work and a processed work.

(Prior Art) In the work conveyor as described above, a guide shaft that vertically guides the work is erected on each base that moves on the horizontal circulation path at appropriate intervals. If there is no through hole, or if it has a through hole in the center but the through hole is not a perfect circle, the work can be lifted and lowered by multiple guide shafts that surround the periphery of the work. Need to guide.

In the case of such a work conveyor, the positions of the plurality of guide shafts are respectively adjusted in the radial direction according to the diameter of the work to be handled so that the center of the work guided vertically by the guide shaft is constant. There must be.

In the conventional work conveyor of this type, each guide shaft is individually mounted on each of the bases so as to be movable and fixed in the radial direction.

(Problems to be solved by the invention) In the conventional work conveyor as described above, when the diameter of the work to be handled changes, the position of each guide shaft should be equidistant from the center of the base using a scale or the like. ,
The position of each of the plurality of guide shafts must be adjusted separately, which is a drawback that requires a lot of labor and time.

(Means for Solving the Problems) In order to solve the above conventional problems, the present invention provides
On each base that moves at appropriate intervals on the horizontal circulation path,
In a work conveyor in which a plurality of guide shafts surrounding a work are erected, one central gear and a plurality of planetary gears of the same diameter which mesh with the central gear are pivotally supported on each of the bases. The present invention proposes a work conveyor including locking means for fixing at least one gear, and interlockingly connecting the guide shafts to the same eccentric position of each planetary gear.

(Operation of device) Work pieces are stacked inside a plurality of guide shafts on each base. At this time, the positions of the guide shafts are adjusted so that the work is held concentrically with the center of the base (the center of the central gear). For this adjustment, for example, one guide shaft is supported by a planet that supports the guide shaft. This is done by rotating around the center of the gear.

That is, when one planetary gear rotates, the other planetary gears also rotate in the same direction by the same angle through the central gear, so that the guide shafts linked to the same eccentric position of each planetary gear are , Around the center of the planetary gear, it rotates in the same direction and by the same angle, so that the guide shafts keep the distance from the center of the central gear equal to each other, Will be moved to.

If the position of each guide shaft is adjusted so as to be close to the peripheral surface of the work as described above, the positions of all the guide shafts are fixed by fixing at least one gear by the locking means, and the work is It is held so that it can only be lifted and lowered within a space surrounded by the plurality of guide shafts.

(Example) Hereinafter, one example of the present invention will be described with reference to the accompanying drawings.

1 and 2, 1 is a numerically controlled machine tool (N
A machine tool such as a C machine) and includes a work chuck 2 that is driven to rotate about a horizontal axis 2a. 3 is a work conveyor according to the present invention, which is a horizontal circulation path 4
A large number of work pallets 5 that can be rotated at equal intervals are provided. 6 is the work conveyor 3
Work pallet 5 located at work transfer position A in
A work pallet located at the work transfer position A of the work conveyor 3 for loading the pre-processed work received from above and supplying it to the work chuck 2 of the machine tool 1 and for receiving the processed work received from the work chuck 2 of the machine tool 1. It is a work transfer device for transferring and unloading the work onto the work piece 5, and comprises a loading work holding means 8 and an unloading work holding means 9 which are moved by a manipulator 7 having a required degree of freedom.

The work conveyor 3 is a drive chain 1 stretched along the horizontal circulation path 4 as shown in FIGS.
0, bases 13 attached to the drive chain 10 at equal intervals and sliding on the support surface 11 via three wheels 12, a plurality of guide shafts 14 standing on each base 13, and It is composed of a work pallet lifter 15 attached to the work transfer position A. Reference numeral 16 is a drive toothed wheel that rotationally drives the drive chain 10 in any forward and reverse directions, and is linked to a hydraulic motor 17.

The work pallet lifter 15 is composed of a work pallet lifting fork 19 supported by two guide rods 18 so as to be able to move up and down, and a cylinder unit 20 that drives the fork 19 to move up and down.
9 is loosely fitted in the concave groove 21 formed in the support surface 11 so as to be flush with the support surface 11 when in the lower limit position.

The work pallet 5 has a through hole through which the guide shafts 14 of the respective bases 13 pass, and is placed on the bases 13 while being guided by the guide shafts 14 so as to be lifted and lowered. The works W positioned inside are supported in a stacked state.

At the work transfer position A, the work pallet lifter 1
5, a positioning means 22 for the base 13 is also provided. The base positioning means 22 is, as shown in FIG. 6, a lever 24 pivotably supported on the lower side of the work conveyor 3 by a vertical support shaft 23, and a circle erected at one end of the lever 24. Column pusher 25 and this pusher 2
5 is a spring 26 for positioning at a standby position outside the movement path of the base 13, and an actuator 27 for pressing and swinging the lever 24 against the biasing force of the spring 26.
And two bearings 28, 29 for receiving two locations near the front and rear ends on the inner side of the base 13.

The cylindrical pusher 25 projects upward from the support surface 11 of the work conveyor 3 through the notch hole 30 and faces the center position of the outer side of the base 13 at the work transfer position A. Further, of the two bearings 28 and 29, one bearing 28 is the rotary shaft 16 a of the drive toothed wheel 16.
The other bearing 29 is mounted on the support surface 11 at an intermediate position of the drive chain 10.

Therefore, when the lever 24 is swung against the biasing force of the spring 26 by the actuator 27 while the predetermined base 13 is stopped at the work transfer position A, the cylindrical pusher 25 is moved to the work transfer position A. The center position of the outer side of the base 13 that is stopped is pressed inward, and the front and rear two positions of the inner side of the base 13 are pressed against the bearings 28 and 29, whereby the base 13 is positioned at a predetermined position. .

If one end of the inner side of the base 13 is reliably positioned by the drive toothed wheel 16 as shown in the figure, the drive toothed wheel 1
The bearing 28 on the 6 side can be omitted. Further, as shown in FIG. 4, if a conical surface portion 25a with a downward constriction is formed in the cylindrical pusher 25 and the outer side of the base 13 is pressed inward by the conical surface portion 25a, Base 1
It is also possible to obtain an effect of preventing the outer side of 3 from rising and holding the base 13 in a horizontal posture.

Next, the support structure of each guide shaft 14 with respect to the base 13 will be described in detail. As shown in FIGS. 7 to 9, an upper plate 32 is installed on the base 13 via a spacer 31. One central gear 33 is rotatably supported at a central position below the upper plate 32 through a vertical support shaft 34, and four planet gears 35 having the same diameter and meshing with the central gear 33.
a to 35d are vertical rotation shafts 36a below the upper plate 32.
The shafts are supported at equal intervals in the circumferential direction by 36d. Arms 37a to 37d that rotate integrally with the planetary gears 35a to 35d via the vertical rotation shafts 36a to 36d and are oriented in the same direction are arranged on the upper side of the upper plate 32, and the arms 37a to 37d move freely. Vertical rotation shafts 36a-3 at the ends
The guide shafts 14 are erected at the same distance from 6d.

The work pallet 5 is provided with four radial elongated holes 38a to 38d at equal intervals.
4 penetrates the long holes 38a to 38d.

39 is a locking means, and the two vertical rotation shafts 36
The lock plate 40 is loosely fitted to the heads of a and 36d, and the lock bolt 41 is screwed through the central portion of the lock plate 40 and the inner end of which abuts on the head of the vertical support shaft 34. .

On the work pallets 5 supported on the respective bases 13, pre-processed works W are loaded, except for the work pallets 5 assigned for receiving the processed works. At this time, the work W is loaded inside the four guide shafts 14, but each guide shaft 14 is
The distance between each guide shaft 14 and the center of the central gear 33 is set so that the work W is held concentrically with the center of the work pallet 5 (center of the central gear 33) in the vicinity of the peripheral surface of the center gear 33. It is adjusted according to the diameter of the work W. In this adjustment, the lock bolt 41 of the lock means 39 is loosened to release the fixation of the vertical rotation shafts 36a and 36d, and one guide shaft 14, for example, the guide shaft 14 erected on the arm 37a is It is performed by rotating around the vertical rotation axis 36a.

That is, when the arm 37a is rotated by the guide shaft 14, the rotation of the arm 37a is transmitted through the vertical rotation shaft 36a.
5a and further transmitted to all the other planetary gears 35b to 35d via the central gear 33, and all the planetary gears 3
5a-35d will rotate the same angle in the same direction. Therefore, all the other guide shafts 14 are also operated via the planetary gears 35b to 35d, the vertical rotation shafts 36b to 36d, and the arms 37b to 37d to operate the one arm 3
It rotates in the same direction as the guide shaft 14 on 7a by the same angle. As a result, each guide shaft 14
Moves in the perspective direction with respect to the center of the central gear 33 while maintaining the same distance from the center of the central gear 33.

When the positions of the guide shafts 14 are adjusted so that the diameter of the virtual circle inscribed in each guide shaft 14 is slightly larger than the diameter of the work W to be handled as described above, the lock bolt 41 of the lock means 39 is tightened. By inserting the lock plate 40 into pressure contact with the heads of the vertical rotary shafts 36a, 36a,
planet gears 35a and 35d and an arm 37 which are interlocked with d
It is sufficient to fix a and 37d. The work palette 5
Will rotate slightly through the elongated holes 38a to 38d fitted into the guide shafts 14 by adjusting the position of the guide shafts 14, but the center position will not change.

In FIG. 8, the position of the guide shaft 14 when guiding the workpiece W1 having the maximum diameter is shown by a solid line, and the workpiece W having the intermediate diameter W is shown.
The position of the guide shaft 14 when guiding 2 is shown by an imaginary line.

By the position adjustment of the guide shaft 14 described above, the work W loaded on the work pallet 5 that can be moved up and down along the guide shaft 14 has its circumferential surface guided by the guide shaft 1.
Since it is positioned by 4, the work pallet 5 is held concentrically with the work pallet 5 so that it can only be moved up and down. The work pallet 5 on each base 13 on which the work W is loaded in this way
Can call any one of them to the work transfer position A by rotating the drive chain 10. The work pallet 5 called to the work transfer position A can be accurately positioned at a fixed position by positioning the base 13 at the work transfer position A by the base positioning means 22 as described above.

Since the work pallet 5 protrudes from the base 13 to the front and rear sides, by raising the fork 19 of the work pallet lifter 15 by the cylinder unit 20, the work pallet 5 is placed on the base 13 positioned at the work transfer position A. The work pallet 5 of
The portion protruding from 3 can be used to lift it as shown in FIG. Therefore, as shown in FIG. 4, by making the loading work gripping means 8 stand by just above the work transfer position A in a downward direction, the uppermost work W loaded on the work pallet 5 to be lifted.
Can be pressed against the work gripping means 8, and the work gripping means 8 can be operated in such a state to grip the uppermost work W on the work pallet 5.

Further, when the processed work is transferred onto the work conveyor 3, the drive chain 10 calls a specific work pallet 5 (base 13) assigned to receive the processed work to the work transfer position A, The work pallet 5 is lifted by the fork 19 of the work pallet lifter 15 as described above with the unloading work holding means 9 holding the processed work W just above the transfer position A being made to wait downward. The work pallet 5 or the processed work W already placed on the work pallet 5 is pressed against the lower end of the processed work W gripped by the unloading work gripping means 9 in the state of holding the work. The means 9 is opened, and then the work pallet 5 is lowered by the fork 19 to finish the descent. Over click W a can be transferred onto the work pallet 5. At this time, the work W is automatically fitted inside the guide shaft 14.

In the above embodiment, the work pallet 5 is also used, and the base 1
Although the work W having a diameter smaller than 3 can be lifted and lowered by the fork 19, the work W to be handled is always the base 13
The work pallet 5 can be omitted when the work W is larger than the above or when the transfer method of the work W is different.

Further, the arms 37a to 37d are used to interlock the guide shaft 14 with the eccentric positions of the planetary gears 35a to 35d, but the planetary gears 35a to 35d are pivotally supported on the base 13 and the upper plate 32 is not provided. , Planet gears 35a-35
It is also possible to directly set the guide shaft 14 upright at the eccentric position of d. Of course, the number of guide shafts 14 is not limited to four, and if necessary, the central guide shafts may be provided upright concentrically with the central gear 33. Further, the locking means may have any structure as long as it can fix at least one of the central gear and the planetary gear, for example, one planetary gear is simply pressed and fixed from the side with bolts. It may be one.

(Effects of the Invention) As described above, according to the work conveyor of the present invention, the work of adjusting the position of the guide shaft on each base according to the diameter of the work to be handled can be performed very easily, easily, and quickly. Since the shaft can always be positioned accurately and equidistant from the center of the base (center of the central gear), it is possible to accurately hold workpieces of various diameters that cannot be guided unless they are on the peripheral surface. Can be done.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a use state of a work conveyor according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a side view showing a main part of the work conveyor and a work holding means, and FIG. 4 is a work. FIG. 5 is a plan view showing the essential parts of the work conveyor, FIG. 5 is a plan view showing the positioning means of the base, and FIG. 7 is a rear view for explaining the transfer state of the work between the conveyor and the work holding means. The figure is a partially longitudinal front view showing the details of the guide shaft supporting structure for the base, and FIG. 8 is the same plan view.
FIG. 9 is a transverse plan view of the same. 1 ... Machine tool, 2 ... Work chuck, 3 ... Work conveyor, 5 ... Work pallet, 6 ... Work transfer device, 7
... manipulator, 8 ... workpiece gripping means for loading, 9 ... workpiece gripping means for unloading, 10 ... driving chain, 12 ... wheels, 13 ... base, 14 ... guide shaft, 15 ... work pallet lifter, 22 ... base positioning Means, 32 ... Upper plate, 33 ... Central gear, 35a-3
5d ... Planetary gears, 37a to 37d ... Arms, 38a to 3
8d ... long hole, 39 ... locking means.

Claims (1)

[Scope of utility model registration request] 1. A work conveyor in which a plurality of guide shafts surrounding a work are erected on respective bases which move on a horizontal circulation path at appropriate intervals, and one central gear is provided on each of the bases. And a plurality of planetary gears of the same diameter that mesh with the central gear, and a lock means for fixing at least one gear is provided, and the guide shafts are interlockingly connected to the same eccentric position of each planetary gear. A work conveyor that consists of