JPS6328739B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for loading a pallet for work replacement onto a table of a machine tool and taking it out after machining.

As the above-mentioned device, the present inventor considered a structure shown in FIG. 7 prior to the present invention. That is, an auxiliary table 40 is mounted and fixed on the table 1 of the machine tool, and on this auxiliary table 40 are installed a pallet support base 46, a guide rail 42, a running rail 43, a stopper 44, and a pair of positioning connectors that can be moved up and down. 45, equipped with a clamp mechanism 46a, etc., and on the other hand,
The bottom surface of the pallet 2, on which the workpieces are properly set and fixed by a clamping mechanism, has a T-shaped groove 47 that engages with the guide rail 43 and the clamp arm of the clamping mechanism 46a, and a square groove containing a spring support wheel that acts on the traveling rail. 48 and a plug hole 49 corresponding to the plug 45 are provided, and the spring support wheels in the square groove 48 are rolled on the running rail 43 to carry the pallet 2 in from the front of the table 1, and then the plug type positioning is performed. Planar positioning is performed by means 45 and 49, and the clamp arm 46a engaged with the T-shaped groove 47 is driven down to load and fix the pallet onto the auxiliary table.

However, in this device, it is necessary to machine a T-shaped groove 47, a square groove 48 with a spring support wheel inside, a plug hole 49, etc. on the bottom surface of the pallet 2 itself, and when using a large number of pallets, each pallet is It would be disadvantageous in terms of cost to apply such processing to everything.

This invention adopts a contact-type positioning and clamping method instead of the joint positioning method, and is equipped with a roller conveyance mechanism for loading and unloading the pallet on the table. The purpose of the present invention is to eliminate the need for special processing for loading and unloading, and to construct a pallet with a simple structure and low cost.

Embodiments of the present invention will be described below based on the drawings.

As shown in Figures 1 and 2, cutting, grinding,
At the front of the left-right drive table 1 of a machine tool M that performs metal processing or other metal processing, a pallet carrier 3 on which two workpiece exchange pallets 2, 2 can be loaded in parallel on the left and right is installed along rails 4, 4. It is installed to be able to reciprocate from side to side, and a relay table 5 is fixed between the table 1 and the carrier 3, and a large number of workpieces are clamped onto the pallet 2 on the carrier 3 by appropriate clamping means (not shown). After setting and fixing the pallet 2 with The structure is such that a new pallet 2 is carried in and set in the same manner.

The pallet loading groups 3A and 3B on two sides formed on the left and right sides of the conveyance vehicle 3 are provided with a pair of roller conveyance mechanisms 6 and 6 on the left and right and pallet guides 7, and a similar roller conveyance mechanism 8 is also provided on the relay table 5. - 8 and pallet guides 9, 9 are provided, and a pair of left and right roller conveyance mechanisms 10, 10, which can be driven up and down, are installed on the table 1.

As shown in FIGS. 5 and 6, this roller conveyance mechanism 10 consists of a short cylindrical support 12 fixed to the top surface of a table 1 with bolts 11, and 13 groups of free-rotating rollers pivotally supported on the left and right outer surfaces. A long rectangular bar-shaped movable frame 14 is supported vertically within a certain range, and the movable frame 14 is constantly biased downward by a coil spring 15 fitted onto the column 12. A hydraulic cylinder device 16 is incorporated inside the movable frame 14, and the movable frame 14 is configured to be driven upward against a spring 15 by supplying pressure oil.

Numerous T-shaped grooves 1 formed on the top surface of the table 1
7... are fitted with various members constituting a positioning and fixing device.

That is, at the back of the table 1, there is a pair of left and right positioning support members 18, 18 for receiving the back side 2a of the pallet 2, and on the left side of the table 1, there is a pair of positioning support members 18 for receiving the left side 2b of the pallet 2. A pair of front and rear positioning support members 19 are fixed respectively. As shown in FIGS. 3 and 4, these supporting members 18 and 19 are comprised of base blocks 18a and 19a that are fixed to the T-shaped groove 17 via bolts 20 and 21 and nut blocks 22 and 23, and bolts 22 and 23.
The base block 18 is composed of stoppers 18b and 19b, respectively, which can be adjusted slightly in and out in a taper cam type by tightening adjustment of 4 and 25.
The upper surfaces of the tips of a and 19a are configured as mounting surfaces 26 and 27 that receive the pallet 2 at a constant level.

Further, on the right side of the table 1, there is a pair of front and rear clamp mechanisms 2 that act on the right side 2c of the pallet 2.
8 and 28, and a pair of left and right clamp mechanisms 29 and 29, which act on the front side 2d of the pallet 2, are provided at the front of the table 1, respectively.

As shown in FIG. 3, the side clamping mechanism 28 has a cylinder body 28a fixed to the T-shaped groove 17 via a bolt 30 and a nut block 31.
The body 28a has a pusher 28b which is hydraulically protrudingly driven and retracted by a spring so as to protrude and move diagonally downward, and a pallet mounting surface for the supporting members 18 and 19 is provided on the top surface of the tip of the body 28a. Pallet placement surface 32 on the same level as 26 and 27
is formed.

The front clamp mechanism 29 also includes a base block 29a fixed to the T-shaped groove 17 via a bolt 33 and a nut block 34, and a base block 29a fixed to the T-shaped groove 17 via a bolt 33 and a nut block 34.
The cylinder body 29b is made up of a cylinder body 29b that is slidable along the left and right T-shaped grooves 35 formed on the upper surface of the cylinder body 29a, and a pusher 29c of a hydraulic protrusion drive and spring retraction type built into the cylinder body 29b, and a base block 29a.
The upper surface of each pallet mounting surface 26, 27, 32
The pallet mounting surface 36 is formed on the same level as the pallet mounting surface 36. Each cylinder body 29b is configured to be slidably movable to a retired position located laterally outwardly from the front-rear loading/unloading path of the pallet 2.

Furthermore, level blocks 37, 37, which are at the same level as the pallet mounting surfaces 26, 27, 32, and 36, are fixed to the center of the table 1 using bolts and nut blocks.

When the roller conveyance mechanism 10 is raised, the upper end of the roller group 13 protrudes beyond the pallet placement level regulated by the pallet placement surfaces 26, 27, 32, and 36 and the level block 37, and the movable frame When the rollers 14 are lowered, the range of their downward movement is set so that the upper end of the group of rollers 13 is located lower than the pallet placement level.

Note that the roller conveyance mechanism 10 may be implemented in such a manner that an idler roller is inserted and supported in a recess formed on the upper surface of the movable frame.
The configuration in which the group of idling rollers 13 are pivotally supported on the outside of the roller 4 is more advantageous in terms of maintenance because there is less possibility that machining debris and dust will adhere and accumulate and cause idling failure.

Further, the clamping mechanisms 28 and 29 may be of a simple manually operated screw tightening type, or the front clamping mechanism 29 may be removed each time a pallet is loaded or unloaded.

Since the present invention is configured as described above, it has the following effects.

The pallet for workpiece replacement is positioned by abutment support of two adjacent sides of the pallet by a positioning support member and a pressing clamp by a clamp mechanism that acts on the other two sides, so it is easy to use for connecting plug holes and clamp arm engagement. It is not necessary to form a T-shaped groove on the bottom of the pallet, and an elevating roller conveyance mechanism can be installed on the table of the machine tool for loading and unloading the pallet.
Since the pallet is simply placed and rolled on the roller conveyance mechanism, no special processing is required on the bottom of the pallet, and the pallet can be manufactured easily and inexpensively, and the pallet itself can be made thin while maintaining its strength.

Further, since a conveyance mechanism such as a spring-supported wheel is not incorporated into each pallet, when a large number of pallets are used, the overall cost reduction is large and the practical effect is high.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall perspective view, FIG. 2 is an overall plan view, FIG. 3 is a longitudinal sectional front view of the main part, and FIG. 4 is a partial cutaway of the main part. Side view,
5 and 6 are a sectional view taken along the - line and a sectional view taken along the - line in FIG. 2, respectively, and FIG. 7 is a perspective view of the device previously conceived by the present invention. DESCRIPTION OF SYMBOLS 1...Table, 2...Pallet for work exchange, 2a, 2b, 2c, 2d...Side sides of pallet, 10...Roller conveyance mechanism, 13...Idling roller, 14...Movable frame, 18, 19 ...Positioning support member, 28/29...Clamp mechanism.

Claims (1)

[Claims] 1. A pallet 2 for workpiece replacement is placed and supported on a table 1 of a machine tool at a constant level above the table 1, and two adjacent sides 2 of the pallet 2 are
positioning support members 18 and 19 for positioning and abutting support on the pallet 2, and two side sides 2a for placing and supporting the pallet 2 at a certain level on the table 1 and opposing the other two sides 2c and 2d of the pallet 2.・2b
Clamp mechanism 28 that presses and clamps toward the side.
29 and a roller conveyance mechanism 10 for carrying in and out the pallet 2 onto the table 1, and the roller conveyance mechanism 10 is attached to a movable frame 14 that is driven up and down on the table 1, and a group of idling rollers 13 is attached thereto. When the movable frame 14 is raised, the upper end of the roller group 13 protrudes higher than the pallet mounting level of the positioning support members 18, 19 and the clamp mechanisms 28, 29, and when the movable frame 14 is lowered, the upper end of the roller group 13 is lower than the pallet mounting level. 1. A pallet loading/unloading device for workpiece exchange in a machine tool, characterized in that the loading/unloading device is configured such that the height is lower than the installation level. 2. The apparatus according to claim 1, wherein the group of idling rollers 13 of the roller conveyance mechanism 10 is pivotally supported on the lateral outer surface of the movable frame 14.