JPS6231236Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention enables pallet exchange by simultaneously rotating the pallet on a machine table such as a machining center and the pallet on the base of a pallet changer. This is related to the pallet changer.

<Prior art> Conventional pallet changers perform pallet exchange by simultaneously rotating the pallet on the machine table of the machining center and the pallet in the standby position on the base of the pallet changer by 180 degrees. There are two arc-shaped support rails on the base, and the width between the rails is widened to prevent the pallet from falling over while rotating, and the machine table is installed in a circular curve when it is in the pallet exchange position. The two pallets are rotated at the same time by rotating a rotating arm provided on the base at the center of rotation of the pallets. However, in general, machining centers have spaces on both ends of the machine table, excluding the central part where the pallet is placed, in which drive devices, valves, etc. are installed from above, and when the above-mentioned support rails are installed, , it is necessary to provide a support rail that protrudes from the center of the machine table, and if the width between the rails is wide, the support rail will occupy the upper part of the drive device and valves, etc. There is a problem that it is difficult to carry out work such as holding it because it has to be removed. There is also a method of expanding the center of the machine table and supporting the entire support rail at the center, but in this case there is a problem that a large machine table must be used.

<Purpose of the invention> In order to solve the above-mentioned problems, the purpose of the present invention is to provide a pallet changer that facilitates maintenance of drive devices, valves, etc. installed at both ends of the machine table. It is to provide.

<Structure of the invention> The present invention has a support member that supports two pallets being rotated in a circular curve shape on the machine table and the base of the pallet changer at the pallet exchange position, and supports the center part of the lower surface of the pallet. The rotating member is provided so as to rotate around the center of rotation of the pallet, and an engaging portion that engages with a hook protruding from the pallet is formed on the rotating member. A pallet tipping prevention member is provided concentrically with the rotating shaft, and a notch is formed in a part of the circumference of the pallet tipping prevention member to allow the lowering of the pallet hook on the machine table at the pallet exchange position. It is.

<Examples> Examples of the present invention will be described below based on the drawings. Reference numeral 1 designates a base of a machining center, and a machine table 2 is provided on the base 1 so as to be slidable in the left-right direction, and this machine table 2 is positioned at a pallet exchange position when a pallet is exchanged. An index table 3 is rotatably supported on the machine table 2 so as to be rotatable around a vertical axis, and is rotated and indexed by an index drive motor 6 built in the machine table 2. A clamp member 4 having a T-shaped cross section and an arc shape, which can be moved up and down relative to the index table 3 and loosely fits into a guide groove of a pallet, which will be described later, is supported on the index table 3. The index drive motor 6, valve 7, etc. are provided on the machine table 2, and are covered with a cover 5. A pallet changer base 20 is installed in front of the base 1, and this base 2
A circular turntable 21 is rotatably supported around the vertical axis, and the turntable 21 is prevented from rotating when the pallet 40 is turned, and can be turned to a required angular position when the workpiece is attached or detached. When the line connecting the centers of indexing table 3 and turntable 21 is perpendicular to the sliding direction of machine table 2, it is located between indexing table 3 and turntable 21 and rotates around the vertical axis. A rotating shaft 22 is supported on the base 20. The rotating shaft 22 is rotatably driven by a drive motor 23 fixed to the base 20, and a square turning member 24 is fixed to the upper end of the rotating shaft 22. Big index table 3 side and turntable 21
Arc-shaped engagement grooves 25 centered on the axes of the index table 3 and turntable 21 on the sides, respectively.
is formed. The pallet 40 has a wide T-shaped groove 41 formed straight on its lower surface, and an index table 3 and a turntable 2, which will be described later, are mounted on the lower surface of a guide member 42 that is fitted and fixed in this groove 41.
A T-shaped guide groove 43 that comes into contact with a support roller and a guide roller installed on the roller 1 is formed in an arc shape. A support roller 6 supports the pallet 40 being conveyed between the indexing table 3 and the turntable 21 when the machine table 2 is in the pallet exchange position.
0 are provided at positions supporting the center of the lower surface of the pallet at equal angular intervals in a circular curve shape centered on the rotating shaft 22, and the width between the rows in the radial direction centered on the rotating shaft 22 is made as narrow as possible in two rows. are paralleled. Support roller 60 located on turntable 21
is pivotally supported on the turntable 21, and guide rollers 61 are pivotally supported between the support rollers 60 for restraining the movement of the pallet 40 in the radial direction. The support roller 60 located on the indexing table 3 is pivotally supported by the clamp member 4 through a notch in the clamp member 4, and between the support rollers 60, a guide roller 61 is pivotally supported by the clamp member 4 through a notch in the clamp member 4. supported. The support roller 60 located on the base 1 except for the position above the index table 3 is pivotally supported by a support plate 63, and this support plate 63 is connected to a bracket 6 projecting from both sides of the machine table 2 above the cover 5.
4 is fixed on top. The support roller 60 located on the base 20 except on the turntable 21 is pivotally supported by a support plate 65, and this support plate 65 is attached to the base 20.
fixed on top. When the two pallets 40 are placed facing each other on the indexing table 3 and turntable 21, the engagement groove 25 of the rotating member 24 is formed on the side surface of the pallet 40 on the rotating shaft 22 side.
A hook 44 that can be inserted from below is protruded from the top. When the engagement groove 25 and the hook 44 are in the engaged state, the two pallets 40 are simultaneously rotated 180 degrees by the rotation of the rotation member 24. A ring-shaped plate 26 is fixed to the base 20 below the engagement groove 25 of the rotating member 24 at a position where the hook 44 is sandwiched between the rotating member 24 and the ring-shaped plate 26 . When the pallet 40 is supported by two rows of support rollers 60, there is a slight gap between the hook 44 and the plate 26, and the pallet 40 is supported by the rotating shaft 2.
When the rotating shaft 22 is tilted to the opposite side, the hook 44 and the plate 26 come into contact with each other to prevent the rotating shaft from falling.When the rotating shaft 22 is tilted to the opposite side, the rotating member 24 prevents the rotating member from falling. ing. The pallet 40 on the indexing table 3 is connected to the engagement groove 2 of the rotating member 24.
A notch 27 is formed on the index table 3 side of the plate 26 so that the hook 44 can be removed from the engagement groove 25, and by lowering the clamp member 4 in this state, the hook 44 can be removed from the engagement groove 25. It's summery.

Next, the operation in the above configuration will be explained. When the machining of the workpiece on the pallet 40 positioned and clamped on the indexing table 3 is completed, the machine table 2 is positioned at the pallet exchange position,
As a result, the support roller 60 that is pivotally supported on the clamp member 4 and the cover 5, and the support roller 6 that is pivotally supported on the base 20 and the turntable 21, respectively.
0 constitutes a circular orbit centered on the rotating shaft 22. In this state, the clamp member 4 is raised and the pallet 40 is raised by a certain amount.
The positioning clamp is released, and the hook 44 is engaged with the engagement groove 25 of the rotating member 24. Subsequently, the rotating member 24 is driven to rotate by the drive motor 23, and both pallets 40 engaged with the rotating member 24 are rotated while being supported by the support rollers 60. During such turning, the pallet 40 is prevented from tilting by the hook 44 being held between the turning member 24 and the plate 26. Rotating member 2
4 is rotated 180 degrees, the drive motor 23 is stopped, and the pallet 40 with the machined workpieces mounted thereon is carried out from the indexing table 3 onto the turntable 21, and the pallet 40 to be machined next is carried out. The pallet 40 with the workpiece attached is the turntable 2
1 onto the indexing table 3. Next, by lowering the clamp member 4, the pallet 40 is positioned and clamped on the index table 3, and the hook 44 is released from the engagement groove 25, and then the machine table 2 is moved to machine the workpiece on the pallet 40. will be moved.

During this processing, the processed workpiece is removed from the pallet 40 that has been carried out to the pallet exchange position,
A new unmachined workpiece is attached. At this time, the turntable 21 is rotated to an angle position that allows easy attachment and detachment of the workpiece.

In the above embodiment, an example was described in which the support rollers 60 were configured in two rows with a narrow interval, but the number of support rollers 60 is not limited to two rows, and may be one row as long as it can sufficiently support the pallet 40. .
In addition, the plate 2 that prevents the pallet 40 from falling down
6 may be composed of a plurality of rollers.

<Effects of the invention> As described above, the present invention includes a rotating member that is driven to rotate at the center of rotation of the pallet and has an engaging portion that engages with a hook protruding from the pallet, and a rotating member that engages with a part of the hook. A pallet fall prevention member provided on the base concentrically with the rotation axis, and a support member provided in a circular curve shape to support the center of the lower surface of the pallet in one row or two rows with a narrow width between the rows. With this configuration, the installation radius of the support member relative to the rotation axis of the rotation member can be reduced, and the space occupied by the support member above the drive device, valve, etc. installed at both ends of the machine table can be reduced, so that the support member can be This has the advantage that work such as holding the drive device, valves, etc. can be done easily without removing the members. It also has the advantage of not requiring the use of a large machine table, and the width of the arc-shaped guide groove formed on the bottom surface of the pallet to be supported by the support member is small, making it easier to process the guide groove. There are advantages to becoming

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a top view of a pallet changer and a machining center, and FIG. 2 is a cross-sectional view taken along the line - in FIG. 2... Machine table, 3... Index table, 4... Clamp member, 20... Base, 21...
... Turntable, 22 ... Rotating shaft, 23 ... Drive motor, 24 ... Swivel member, 25 ... Engagement groove,
26...Plate, 40...Palette, 42...
Guide member, 43... Guide groove, 44... Hook, 6
0... Support roller, 61... Guide roller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A base of a pallet changer installed adjacent to a machine table of a machining center or the like having a clamp member that can be raised and lowered, and a pallet standby position on the base and the machine table. A rotating shaft is rotatably supported on a base in the middle of the base for rotation around a vertical axis, a rotating member is fixed to the rotating shaft and forms a pair of engaging parts symmetrical about the center of rotation, and the machine table is used for pallet exchange. a support member that has a circular curve shape centered on the rotation axis and is provided at a position on the machine table and base to support the center portion of the lower surface of the pallet when the pallet is in the position;
A hook that protrudes from the pallet toward the center of the rotating shaft and engages with one of the engaging portions of the rotating member, and a hook that engages with a part of the hook to prevent the pallet from falling over as it moves on the support member. A pallet fall prevention member is provided on the base in a concentric circle with the rotating shaft, and a pallet fall prevention member is formed on a part of the circumference of the pallet fall prevention member to prevent the clamp member from falling on the machine table at the pallet exchange position. and a notch for allowing the hook of the pallet to be lowered. (2) The pallet changer according to claim 1, wherein the supporting members are arranged in two narrow rows in the radial direction around the rotation axis.