JPH04176535A - Tool changing device for printed board work machine - Google Patents

Abstract

PURPOSE:To directly perform the delivery of a tool between a spindle and tool cassette, regardless of the gap of the tool arranged on a tool cassette, by vertically moving the necessary tool post, and performing the delivery of the tool. CONSTITUTION:When a tool change command is transmitted to a printed board work machine, a spindle is positioned at the upper part of a tool post 50. Then, the compressed air of the line including the tool post 50 is released to the atmosphere, simultaneously, the compressed air is fed to the row including the tool post 50 for receiving a tool. Then, the compressed air is fed to all of cylinders 32 included in the row, and a raising force is acted on the piston 38 of each cylinder 32. When the raised tool post 50 receives a tool 55 with its engaging with the collar 56 of the tool 55 held on the spindle, the compressed air inside the cylinder 32 is released to the atmosphere. Simultaneously the compressed air is fed from feeding passages 35, 45, the pistons 38, 48 are descended, and the tool holder 50 is returned to a standby position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tool changing device for a printed circuit board processing machine.

[Prior Art] A printed circuit board processing machine has a configuration as shown in FIG. That is, 1 is a bed, and 2 is a rail of a linear guide device, which is fixed to the bed 1.

Reference numeral 3 denotes a table, which is placed on the rail 2 so as to be movable in the direction of arrow X. The table 3 is then moved via a screw transmission means (not shown).

5 is a column, which is supported by bed 1 so as to straddle table 3. A slider 6 is supported by a rail (not shown) fixed to the column 5 so as to be movable in the direction of arrow Y. 7 is a motor, which is supported by the column 5. 8
is a feed screw, which is rotatably supported by the column 5 parallel to the rail, and one end of which is connected to the motor 7. Then, when the feed screw 8 rotates, the slider 6 moves. A saddle 9 is supported by a rail (not shown) fixed to the slider 6 so as to be movable in the Z direction. Reference numeral 10 denotes a motor, which is supported by the slider 6.

Then, the motor 10 moves the saddle 9 in the direction of the arrow 2 via a transmission means b (not shown). A spindle 11 is rotatably supported by the saddle 9. A chuck (not shown) is disposed at the axis of the spindle 11 so as to be openable and closable, and is adapted to removably hold a machining tool (not shown). 12 is the motor and saddle 9
and is coupled to the spindle 11.

Reference numeral 13 denotes a printed circuit board, which is fixed to the table 3 via reference pins 14 press-fitted to both ends thereof.

15 is a tool cassette in which a plurality of tools (not shown) are arranged at predetermined intervals. And this tool cassette 1
5 is fixed to one end of the table 3.

With this configuration, the table 3 and the slider 6 are moved in the X direction and the Y direction, respectively, so that the processing positions of the spindle 11 and the printed circuit board 13 are opposed to each other, and then the saddle 9 is moved.
is moved in the direction of arrow Z to process the printed circuit board 13.

Two types of tools are known as the tool cassette 15 in a printed circuit board processing machine, such as one in which the tools necessary for processing are sequentially supplied from the tool cassette 15 to the spindle 11.

One of them is one in which tools can be directly transferred between the spindle 11 and the tool cassette 15.

The other one is that the tool cassette 15 is provided with a portion for storing tools and a delivery station for transferring tools, and the tools are delivered via the delivery station.

[Problems to be Solved by the Invention] In a device that directly transfers tools between a spindle and a tool cassette, the spacing between the tools must be widened to prevent interference between the spindle 11 and unintended tools during tool transfer. There must be.

For this reason, the number of tools that can be supplied is small, and manpower is required to supply the tools to the tool cassette, making it impossible to operate the printed circuit board processing machine unattended for a long time.

Further, in the case where a transfer station is provided, a large number of tools can be supplied, but the tools must be replaced twice, which reduces the operating efficiency of the printed circuit board processing machine.

In view of the above circumstances, an object of the present invention is to provide a storage rWJ for tools.
To provide a tool changing device for a printed circuit board processing machine, which allows tools to be directly transferred between a spindle and a tool cassette without widening wI.

[Means for Solving the Problem] In order to achieve the above object, the present invention provides a tool changer for a printed circuit board processing machine in which a plurality of cylinder/piston mechanisms are arranged in M rows and N columns at predetermined intervals. , a plurality of cylinders equipped with a push-up device that simultaneously applies a push-up force to each row or each column and a push-down force to each column or row, and a tool post that holds a tool. The piston mechanism is composed of a tool cassette that is arranged in M rows and N columns at the predetermined intervals, and is configured to apply a downward force to each column or row in the same way as the push-up device. Detachably attached to the top.

[Operation] Before a tool change command is issued to the printed circuit board processing machine, air pressure is supplied to the push-up device and the tool cassette so that a push-down force is applied.

When a tool change command is issued, in order to receive the tool held on the spindle of the printed circuit board processing machine, the air pressure in the column (or row) containing the corresponding tool post is released, and at the same time, the air pressure in the column (or row) containing the tool post is released. ) is supplied with air pressure to apply a pushing force. Then, among the rows to which air pressure has been supplied, only the tool posts in the row in which the push-down force has been released are pushed up. In this state, the tool is returned from the spindle to the tool post that has been pushed up.

Then, air pressure for applying a push-up force is released, air pressure for applying a push-down force is supplied, and the tool post is returned to the standby position.

The spindle then moves over the next tool to be received.

Then, the air pressure in the column (or row) containing the tool post holding the tool to be fed to the spindle is released, and at the same time, air pressure is supplied to the column (or row) containing the tool post to apply a push-up force. Ru. Then, among the rows to which air pressure has been supplied, only the tool posts in the rows in which the push-down force has been released are pushed up, and the tools held by these tool posts are inserted into the spindles waiting above them.

Then, when the spindle or the tool is held, air pressure for applying a push-up force is released, air pressure for applying a push-down force is supplied, and the tool post is returned to the standby position.

In this way, by moving the required tool post up and down and transferring the tool, it is possible to directly transfer the tool between the spindle and the tool cassette, regardless of the spacing between the tools placed in the tool cassette. can.

ε Example] An embodiment of the present invention will be described below with reference to FIG.

In the figure, 20 is a table of a printed circuit board processing machine.

Reference numeral 21 denotes a positioning pin, which is fixed to the table 20 with a through hole formed in its axial center having a small diameter at the top and a large diameter at the bottom, with a tapered hole communicating therebetween.

Reference numeral 22 denotes a float, which has a base portion that slidably fits into the large diameter hole of the positioning pin 21, a shaft portion that forms a predetermined gap between the large diameter hole, and a float that fits into the tapered hole. A taper portion is formed, and a hole communicating from the bottom surface of the base portion to the side surface of the shaft portion is formed, and the shaft portion is inserted into the through hole. 23 is a compressed air supply joint, which is connected to the positioning pin 21.

A spring 24 is inserted into the through hole so as to be located between the float 22 and the supply joint 23, and pushes up the float 22 so that the tapered part of the float 22 fits into the tapered hole. .

31 is the main body of the push-up device. 32 is a cylinder, and the main body 31
M rows (in the direction perpendicular to the paper in Figure 1) N at predetermined intervals.
A row (in the left-right direction of the paper in FIG. 1) is formed. Reference numeral 33 denotes a compressed air supply passage, which is formed for each row so as to communicate with all the cylinders 32 in that row. 34 is a compressed air supply joint, which is connected to the supply port FI@33. Reference numeral 35 denotes a compressed air supply passage, which is formed for each row so as to communicate with all the cylinders 32 in that row.

A kite hole 36 is formed corresponding to each cylinder 32. Reference numeral 37 denotes an O-ring, which is inserted into an annular groove formed in the middle of the guide hole 36.

A piston 38 is slidably fitted into the cylinder 32. A piston rod 39 is partially fixed to the piston 38, and its shaft portion is slidably fitted into the kite hole 36 and is in contact with the O-ring 37 to maintain confidentiality.

40 is a hole in which the positioning pin 2 is inserted into the mounting part of the main body 31.
It is formed to fit with 1.

41 is the main body of the tool cassette. 42 is a cylinder, and the main body 4
1, M rows and N columns are formed at predetermined intervals. Reference numeral 43 denotes a compressed air supply passage, which is formed for each row so as to communicate with all the cylinders in that row. A hole 44 is formed in the mounting portion of the main body 41 so as to fit with the positioning pin 21, and communicates with the supply passage 43. 45 is a pin, in the center of hole 44, hole 44f! -Positioning pin 2
1, the float 22 is pressed down when the float 22 is fitted. Reference numeral 46 denotes a zero ring, which is inserted into an annular groove formed in the upper part of the cylinder 42.

A hole 47 is formed on the bottom surface of the cylinder 42 so as to penetrate through the main body 41.

A piston 48 is slidably fitted into the cylinder 42. A connecting rod 49 is fixed to the lower end of the piston 48.

A tool holder 50 also serves as a piston rod, one end of which is fixed to the piston 48, and its shaft portion contacts the O-ring 46 to keep the inside of the cylinder 42 airtight.

55 is a tool, and a collar 56 is press-fitted into the shaft portion of the tool. The tool 55 or tool holder 50 holds the tool 55 through the collar 56.

With this configuration, after stacking and fixing the tool cassettes on the push-up device, the compressed air supply channel F! Compressed air is supplied to the cylinder 32.42 through @35°43.

Each piston 38.48 then receives the pressure of compressed air and
It is pressed down with a pressing force Fd determined by the pressure receiving area of the piston that receives the pressure.

That is, the pressing force acting on the piston 38 is force F.

F+=π(D, 2-d,") P/4...(1) However, D...inner diameter of cylinder 32, d+...outer diameter of piston rod 39, P...compressed air Similarly, the push-down force F2 acting on the piston 48 is: F2=π(D22-d2')P/4...(2) However, D2...the inner diameter of the cylinder 42, d2: Outer diameter of the tool holter 50, calculated as follows.

Therefore, the push-down force F3 acting on the piston 38 is: F3 = Fl + F2...
・・・・・・・・・・・・(3)

The tool post 50 is pushed down to the standby position by the action of such push-down forces Fl and F2.

When a tool change command is issued to the printed circuit board processing machine, the tool is positioned above the spindle or the tool post that receives the tool.

Then, the compressed air in the row containing the tool post 50 for receiving the tool is released to the atmosphere, and the push-down force F1. F
Cancel 2. At the same time, the row containing the tool post 50 for receiving tools is supplied with compressed air via the supply passage 33. Then, all cylinders 32 included in the column
Pressure #1 air is supplied to the piston 3 of each cylinder 32.
Push-up force F0 acts on 8.

This push-up force F0 is Fo"πD, 2 P/4...
...It is obtained by (4).

Therefore, this push-up force F0 and push-down force F are expressed as F,<F
,・・・・・・・・・・・・・・・・・・・・・
.........(5), cylinder 32
The inner diameter of the cylinder 42 is the inner diameter D2. By setting the outer diameter d1 of the piston rod 39 and the outer diameter d2 of the tool post 50, it is possible to push up only the tool post 50 in the row in which the compressed air is released to the atmosphere.

For example, the inner diameter D1 of the cylinder 32 and the inner diameter D2 of the cylinder 42 are 9 m+, the outer diameter d1 of the piston rod 39 is 4 m+,
When the outside diameter of the tool post 50 is 81xll and compressed air of the same pressure is supplied, the pressing force F acting on the piston 38 in the row where the compressed air is not released is (1), (2
), from equation (3), it becomes 20.5πPm. On the other hand, the push-up force F0 acting on the pistons 38 in the row to which compressed air is supplied is 20.25πPkg from equation (4).

Therefore, the push-down force F3 acting on the pistons 38 in the rows in which compressed air is not released to the atmosphere is greater than the push-up force F0 acting on the pistons 38 in the rows to which compressed air is supplied, and therefore pushes the tool post 50. I won't raise it.

When the pushed-up tool post 50 engages with the collar 56 of the tool 55 held on the spindle to receive the tool 55, the compressed air in the cylinder 32 is released to the atmosphere via the supply passage 32. At the same time, compressed air is supplied from the supply passage 35.43, lowering the piston 38.48 and returning the tool holder 50 to the standby position.

The spindle then moves above the next receiving tool 55.

Compressed air is released to the atmosphere in the row containing the tool post 50 holding the tool 55 to be dispensed. At the same time, compressed air is supplied to the column containing the tool post 50 holding the tool 55 to be supplied. Then, the tool post 50 holding the tool 55 to be supplied is pushed up, and the shank portion of the tool 55 is inserted into the chuck portion of the spindle. When the spindle closes the chuck and holds the tool 55, the compressed air in the column containing the raised tool post 50 is released to the atmosphere. At the same time, compressed air is supplied to the row including the pushed up tool post 50, and the pushed up tool post 50 is pushed down.

Then, the spindle and the table on which the printed circuit board is placed move relative to each other, and processing of the printed circuit board resumes.

In the above embodiment, the piston rod of the tool cassette is used as the tool post 50, or the piston rod is a thin rod like the piston rod 39 of the push-up device, and the tool post 50 is used as the tool post 50 of the tool cassette. It may also be arranged on the main body 41.

With such a configuration, the push-down force can be made sufficiently larger than the push-up force, and the stability of the operation can be improved.

[Effects of the Invention] As described above, according to the present invention, the push-up device has a cylinder/piston mechanism with M rows and N columns, and the cylinder/piston mechanism has a tool post with M rows and N columns. Since a tool cassette is provided and the tool cassette is removably arranged on the push-up device, the arrangement interval of tools can be narrowed and the number of tools supplied to the printed circuit board processing machine can be increased. Furthermore, since tools can be transferred directly between the tool cassette and the spindle, the tool exchange time can be shortened and the operating efficiency of the printed circuit board processing machine can be improved.

[Brief explanation of drawings]

FIG. 1 is a side partial sectional view showing an example of a tool changing device according to the present invention, and FIG. 2 is a perspective view showing an example of a printed circuit board processing machine. 31...Body, 32...Cylinder, 38...Piston 41...Body, 42...Cylinder, 50...Tool post. Patent applicant Hitachi Seiko Co., Ltd. Agent Patent attorney Homa Kobayashi Akihiro Otsuka Figure 2

Claims (2)

[Claims] (1) Multiple cylinder/piston mechanisms at predetermined intervals
The cylinder/piston mechanism is arranged in N rows and N columns, and is equipped with a push-up device that simultaneously applies push-up and push-down forces in each row or each column, and a tool post that holds the tool. A tool cassette is provided in which the push-down force is applied to each row or column of the push-up device, and the tool cassette is removably attached to the push-up device. A tool changing device for a printed circuit board processing machine characterized by being combined. (2) The tool changing device for a printed circuit board processing machine according to claim (1), wherein the piston rod in the cylinder/piston mechanism of the tool cassette is formed of a tool post.