JPS6052900B2 - Pallet loading and unloading equipment for machine tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pallet loading/unloading device for loading a pallet for attaching a workpiece onto a processing table of a machine tool and transporting the pallet after machining the workpiece. is a pallet loading system that can be installed in an open space and allows a pair of front and rear pallets to be loaded and unloaded alternately.
To provide an unloading device with a simple configuration.

In order to achieve the above-mentioned object, the present invention includes a machine stand disposed opposite to a machining table of a machine tool, and the machining table mounted on the machine base so as to be able to rotate at least 1800 times around a substantially central portion. a rotary table extending in the front-rear direction and movably supporting a pair of front and rear pallets toward the processing table; a rotating mechanism for reversing; a pair of front and rear endless conveyance chains disposed at the front and rear of the rotary table, each extending in the front-back direction and rotating forward and backward; and each of the pallets protruding upward from each of these conveyance chains; and a conveying mechanism for selectively conveying each of the pallets, each of which has an engaging pin that can be engaged and detached from each of the engaging fittings provided at the opposite end of the pallet, and when the conveying mechanism is activated, the front surface of the rotary table is The conveying chain located at the front part is rotated to engage its engaging pin with the engaging fitting of the pallet located at the front part of the rotating table, and the pallet is carried in and taken out by the conveying chain. The gist of this paper is a pallet loading and unloading device for a machine tool configured to do so.

As a result, in the present invention, since a pair of front and rear pallets can be carried in and out alternately using a single turntable, two transport stands are required to movably support each pallet. This simplifies the configuration of the device.

In addition, in the present invention, when each pallet is brought in and taken out alternately, the rotary table is only rotated 180 times on the machine base, so each pallet can be brought in and out without requiring a space larger than the size of the device. , it can be carried out, and the installation space for the device is small. Hereinafter, the present invention will be explained based on the drawings. FIG. 1 shows an embodiment of a pallet loading/unloading device according to the present invention.

This pallet loading and unloading device carries a pair of front and rear pallets 30A, 30B on a rotating table 20 assembled on a machine stand 10.
The machine 10 is alternately loaded onto and unloaded from a single processing table T shown in FIG. As shown in FIGS. 1 and 2, the rotary table 20 includes a rectangular transfer table 21 extending in the front-rear direction with respect to the processing table T, and the lower ends of left and right vertical walls 21a and 21b that constitute the transfer table 21. Disc-shaped trolley 2 fixed to
2.

As shown in FIGS. 2 and 3, rollers 22b are rotatably supported by a plurality of brackets 22a provided on the lower surface of the truck 22, respectively, and the rotating table 20 is used to activate a rotation mechanism 40, which will be described later. This makes it possible to rotate on the rails 11 of the machine stand 10. Further, a large number of rollers 21c are rotatably supported on the coexistence walls 21a and 21b of the transport table 21, and the transport table 21 is equipped with a large number of rollers 21c.
1c, each pallet 30A, 30B is placed on the processing table T.
support so that it can be moved towards. The rotation mechanism 40 is shown in FIGS. 2 and 3. The main components are a motor 41 attached to the machine base 10 and a ring-shaped large diameter gear 42 fixed to the center of the lower surface of the truck 22.

The ring-shaped large-diameter gear 42 has approximately 190 mm on its outer periphery. A plurality of supports are provided with toothed portions over the entire length and protrude from the upper surface of the machine base 10. It is supported by member 12. Each of these support members 12 supports the ring-shaped large-diameter gear 42, restricts the movement of the truck 22 in the front, back, left, and right directions, and only allows its rotation. On the other hand, a small diameter gear 43 is attached to the upper end of the rotating shaft 41a of the motor 41. This small diameter gear 43
is constantly meshed with the ring-shaped large-diameter gear 42, and the ring-shaped large-diameter gear 42 is rotated in forward and reverse directions when the motor 41 is activated. This rotation mechanism 40 includes detection switches 44a, 44b, 45a, and 45b that detect the rotational position of the rotating table 20. Each of these detection switches is for controlling the forward and reverse rotation of the turntable 20 to 180 times, and is the detection switch 44a.
, 44b are operated by a dog 46 provided on the cart 22 when the rotary table 20 is rotated in the counterclockwise direction shown in FIG.
First, the detection switch 44a operates to generate a deceleration signal to the motor 41, and then the detection switch 44b operates to generate a stop signal for the motor 41. In addition, the detection switch 4
5"A, 45b are actuated by the dog 46 when the rotary table 20 rotates clockwise in the drawing, and the detection switches 44a, 44b are operated by the dog 46.
It works the same way. As a result, the front-rear direction of the rotary table 20 is reversed. As shown in FIGS. 1, 2, and 4, the conveyance mechanism 50 includes a pair of endless conveyance chains 51A and 51B disposed on the conveyance table 21 of the rotary table 20.

The conveyance chain 51A includes a drive sprocket 53A fixed to a rotary shaft 52A that is rotatably supported and protruded from approximately the center of the bottom 21d of the conveyance table 21, and a support that protrudes from one end of the bottom 21d. It is wound around a driven sprocket 55A rotatably supported by a shaft 54A, and suspended in a horizontal state. Further, the conveyance chain 51B has a rotating shaft 52.
A rotating shaft 5 is slightly offset from A and protrudes in the same way.
Drive sprocket 53B fixed to 2B and transport stand 2
1 and a driven sprocket 55B that is rotatably supported by a support shaft 54B protruding from the other end of the bottom 21d of the motor 1, and is suspended in a horizontal state. Both chains 51
A and 51B are rotated by one motor 56 as shown in FIGS. 2 and 3. The motor 56 is attached to a bracket 23 provided on the lower surface of the cart 22 of the rotating table 20, and a small-diameter gear 56 is attached to the upper end of the rotating shaft 56a.
b is installed. This small diameter gear 56b meshes with a large diameter gear 57B fixed to the lower end of the rotating shaft 52B, and this large diameter gear 57B meshes with a large diameter gear 57A fixed to the lower end of the rotating shaft 52A. As a result, each conveyor chain 51A, 51B is rotated in opposite directions by one motor 56. Each conveyance chain 51A, 51B
As shown in FIGS. 2 and 5, the engagement pin 58
A and 58B are provided to protrude upward. Each engagement pin 58A
, 58B are for engaging and disengaging the engaging metal fittings 31A, 31B provided on the opposite ends of each pallet 30A, 30B. In particular, as shown in FIG. It is possible to enter and exit each of the engagement grooves 32A and 32B from their outer open ends. In this device,
When the conveyance chain 51A is rotated in the direction of arrow A1 with each pallet 30A, 30B retracted onto the conveyance table 21, the engagement pin 58A engages with the engagement fitting 31A to convey the pallet 30A. During this time, the conveying chain 51B rotates in the direction of arrow B1 and the engaging tool 3
The engagement of the engagement pin 58B with the engagement pin 1B is released. The conveyance mechanism 50 includes a pair of detection switches 59a and 59b that detect the rotational position of the conveyance chain 51A, and a pair of detection switches (not shown) that detect the rotational position of the conveyance chain 51B. Each detection switch 59a, 59
b functions when the conveyance chain 51A is located at the front facing the processing table T, and as shown in FIG. When the engagement pin 58A reaches the retracted position P2, the detection switch 59b operates at the dog 59d to generate a stop signal for the motor 56. In the pallet loading and unloading device configured in this way, the rotating table 2
A conveying table 21 of 0 extends in the front and back direction with respect to the processing table T, and a pair of pallets 3 are placed on the front and rear of the conveying table 21.
0A and 30B are placed.

When both pallets 30A and 30B are in the retracted position in this way, when the motor 51 of the conveyance mechanism 50 is started and the conveyance chain 51A is rotated in the direction of arrow A1 shown in FIGS. 1 and 4, the conveyance chain 51A is the engagement pin 58A
is engaged with the engagement fitting 31A of the pallet 30A, and the pallet 30A is transported forward via the engagement pin 58A. When the engagement pin 58A reaches the forward position P3 shown in FIG.
The engagement with the engagement tool 31A is released and the pallet 30A is carried onto the processing table T. When the engagement pin 58A reaches the standby position P1, the conveying chain 51A is stopped by the operation of the detection switch 59a. Further, after finishing machining the workpiece, when the motor 51 is started and the conveyance chain 51A is rotated in the direction of the arrow, the conveyance chain 51A engages the engagement pin 58A with the engagement fitting 31A at the forward position P3. Then, the pallet 30A is transported rearward via the engagement pin 58A. When the engagement pin 58A reaches the retracted position P2, the pallet 30A retracts to the front part on the transport table 21 of the rotary table 20. During this time, the conveyor chain 51B is
Rotate in the direction of arrow B1 until 8B reaches the P4'' position,
Since it then rotates in the eight directions of the arrow, the engagement pin 58B does not engage with the engagement fitting 31B of the pallet 30B.
Pallet 30B is stationary. Next, the rotation mechanism 40
When the motor 41 is activated to rotate the rotary table 20, the rotary table 20 rotates 1800 times, and the forward and backward direction of the conveyance table 21 is reversed. As a result, the pallet 30B, which had been located at the rear on the transport table 21, is located at the front and faces the processing table T. Therefore, when the conveyance chain 51B is rotated in the direction of arrow B2, the conveyance chain 51B engages its engagement pin 58B with the engagement fitting 31B of the pallet 30B and conveys the pallet 30B. Engagement pin 58B
When the pin 58B reaches the forward position P3'', the engagement with the engagement tool 31B is released and the pallet 30B is carried onto the processing table T. When the engagement pin 58B reaches the waiting position P1'', the conveying chain 51B Stop. After that, when the conveying chain 51B is rotated in the two directions of the arrow, the conveying chain 51B
1B carries out the pallet 30B via the engagement pin 58B. During this time, the conveyance chain 51A moves in the direction of arrow A.
Since it rotates in two directions and then in the direction of arrow A1, the engagement pin 58A does not engage with the engagement fitting 31A of the pallet 30A, and the pallet 30A remains stationary. In this way, in the pallet loading and unloading device, the rotary table 20
By rotating the rotary table 20 by 180 degrees, the front and rear directions of the rotary table 20 are reversed, and thereby both pallets 30 A and 3OB supported at the front and rear of the rotary table 20 are alternately carried in and out. There is no need for two transport tables to support 30A and 30B, which simplifies the configuration of the device, and since the rotary table 20 is simply rotated on the machine table, a space larger than the size of the device is required. Each pallet can be loaded and unloaded without any trouble, and the installation space for the equipment is small.

In addition, in this embodiment, both conveyance chains 51A,
51B is configured to be rotationally driven by one motor 56 to simplify the structure of the conveyance mechanism, but in the present invention, both conveyance chains 51A and 51B are configured to be rotated independently. You may.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an example of a pallet loading and unloading device according to the present invention, and FIG. 2 is an enlarged partial longitudinal sectional view of the device.
Figure 3 is a plan view taken in the direction of the arrow ■-■ in Figure 2, Figure 4 is an enlarged partial plan view of the same device, and Figure 5 is the arrow ■-■ in Figure 4.
It is an enlarged side view seen in the ■ direction. Explanation of symbols, 10...Machine base, 20...Rotating table, 21...Transportation stand, 22...Dolly, 30
A, 30B... Pallet, 31A, 31B...
...Engagement metal fitting, 40...Rotation mechanism, 41.
...Motor, 42,43...Gear, 50...
...Transport mechanism, 51A, 51B...Transport chain, 56...Motor, 58A, 58B...
...Engagement pin.

Claims (1)

[Claims] 1. A machine stand placed opposite to the processing table of a machine tool, and at least 180 mm on this machine stand centered approximately at the center.
゜ A rotary table that is rotatably assembled and extends in the front-rear direction with respect to the processing table and supports a pair of front and rear pallets so as to be movable toward the processing table; A rotation mechanism that rotates the rotary table by 180 degrees and reverses its front and rear directions, a pair of front and rear endless conveyor chains disposed at the front and rear of the rotary table, extending in the front and rear directions and rotating forward and backward, and each of these chains. a conveying mechanism for selectively conveying each of the pallets, the conveying mechanism having engaging pins that are respectively removable from respective engaging fittings provided at opposite ends of the pallets and projecting upward from the conveying chain;
When the conveyance mechanism is activated, the conveyance chain located at the front part of the rotary table is rotated to engage its engagement pin with the engagement fitting of the pallet located at the front part of the rotary table, and the conveyance chain is A pallet loading and unloading device for a machine tool configured to load and unload the pallet using a chain.