JPH0134690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a device for fixing a tool to a tool mounting beam, in particular a device for fixing a tool to a tool mounting beam, in particular a device which is removably fixed in a recess of the tool mounting beam and is used together with the tool mounting beam. This device relates to a device for fixing a tool (or mold) to a beam, etc. of a tool attachment part that has a tightening pin holder that forms a cavity into which the handle of the tool is inserted, and is used to fix bending tools, etc. to a press machine. This invention relates to a tool fixing device that is particularly effective when

[Conventional technology]

Tool fixing devices for press brakes of this type are known and widely used, but most of them use bolts and nuts to fix the fastener to the beam. Loosening the fixing screw frees the tightened tool, which can then be removed and replaced with another tool. Although this type of device is sturdy and reliable, it takes a significant amount of time to change the tool. It has drawbacks such as being stuck and requiring a removal tool.

Also, Utility Application No. 52-38579 (Utility Application No. 53-133854)
(No.) is equipped with a hydraulic system, a tightening member, and a tightening bolt, and uses the movable members (piston and cylinder) of the hydraulic system to create a lever using the contact area between the tightening bolt and the tightening member as a fulcrum. A mold clamping device is described in which the punch is pressed against the punch holder using a clamping member and fixed. There are problems in that it is necessary to provide a large number of members, which not only complicates the structure and increases the number of causes of failure, but also makes the entire device expensive.

[Problem that the invention seeks to solve]

The present invention has been made to solve the above-mentioned problems, and its purpose is, for example, to quickly remove a laterally long tool such as a bending mold tool or a holder using a removal tool. To provide an extremely convenient device that can be stably attached to and detached from a fixed part without any trouble.

Another object of the present invention is to provide a tool fixing device that can be installed and used on existing machines without major changes.

Furthermore, it is another object of the present invention to provide a tool fixing device that allows most of the tools on hand to be used as is.

[Means for solving problems]

The above purpose is to provide a tool fixing device for a press brake consisting of the components described in paragraphs (a) to (f) below, namely: (a) a beam on which the tool 2 is attached, and (b) a head and a body, respectively. (c) a lower end that is attached to the edge of the beam and faces the cavity so as to form a cavity between the tool mounting beam and the handle of the tool; A protrusion is formed on the edge to prevent the tool from falling downward by engaging with a protrusion formed along the upper edge of the handle of the tool to be inserted into the cavity; a tightening pin holder that holds a plurality of tightening pins slidably in their respective axial directions so that the ends of their bodies can contact the handle; (e) a groove installed parallel to the longitudinal direction of the tightening pin holder and accommodating the expandable body so that it can come into contact with and pressurize the head of the tightening pin at least when expanded; This can be achieved by a tool fixing device for a press brake comprising: an expandable body holder; and (f) a device for supplying fluid into the expandable body and controlling its pressure.

That is, first, the lower edge of the tightening pin holder of the press brake tool fixing device according to the present invention facing the cavity has a protrusion formed along the upper edge of the tool to be inserted into the cavity. A protrusion is formed which engages with the strip so that the tool can be slid laterally into the cavity and is prevented from falling downward.

An inflatable body holder for accommodating an inflatable body that is expanded and contracted by hydraulic pressure or pneumatic pressure is fixed to the side surface of the tightening pin holder opposite to the cavity, and the surface of the inflatable body holder that contacts the tightening pin holder is fixed to the inflatable body holder. A groove extending in the same direction as the cavity is formed in the groove, and the expansion body is housed in the groove.

Further, the tightening pin holder is formed with a large number of through holes communicating with the cavity, and is provided with a tightening pin that can slide therein. One end of this clamping pin abuts against a tool located in the groove, and the other end abuts against the outer wall of the expandable body, which is inflated by hydraulic or pneumatic pressure.

If the handle of the tool to be fixed is relatively short to be inserted into the groove, secure and stable fixation can be achieved by arranging the holes for the tightening pins in two rows in a zigzag pattern in the longitudinal direction of the tightening pin holder. can. In order to apply pressure evenly on each clamping pin and also to prevent the expansion body from being damaged or rapidly worn out, there is a freely movable structure between the end face of the clamping pin and the expansion body. It's a good idea to insert a washer.

In addition, in order to ensure that the tool is free when the pressure is released from the expansion body, the tightening pin holder is provided with several bottomed holes that open toward the expansion body or toward the washer. Once a compression spring exerting force is placed in each bottomed hole. In this way, when the pressure is released from the expandable body, the expandable body is slightly crushed, the clamping pin can move freely, and the pressure on the tool is also released.

When stability during fixation is not so required, or when the tool has a long handle, it is sufficient to arrange the through holes into which the tightening pins are inserted in a line along the longitudinal direction of the tightening pin holder. In this case, the washer can be omitted by widening the head of the tightening pin on the side that contacts the expansion body so that it acts directly on the free wall of the expansion body.

It is appropriate to use a hose as the expansion body, which is accommodated in a groove in the expansion body holder which is fixed to the clamping pin holder. The hose end is connected to a pressure source via a control valve.

[Effect]

With the tool fixing device configured as described above, it is possible to stably fix a laterally long tool, and it is also possible to quickly and reliably change the tool with a simple operation.

Furthermore, the tool fixing device has a simple structure and can therefore be manufactured at low cost, and is structurally strong, so that it can be used for a long period of time without failure.

Furthermore, the device according to the present invention can be used in machines with conventional screw-type fixing devices, as long as the shape and dimensions of the tightening pin holder are made to be the same as those used in the past. Since it can be replaced as is, there is no need to change the machine tool itself, making it extremely economical.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a front view schematically showing an embodiment of a tool fixing device according to the present invention.

FIG. 2 is a sectional view taken along line A-A in FIG. 1.

FIG. 3 is a sectional view taken along line BB in FIG. 1.

1 and 2, the lower part of a tool-holding beam 1 of a bending press machine and a bending tool 2 fixed thereto are shown in section. A clamping pin holder 3 is fixed to the lower end of the beam 1, the shape and dimensions of which are almost similar to conventional clamping fittings.
A tool mounting groove 4 is formed by the lower part of the beam 1 and the tightening pin holder 3, and a tool handle 2a is placed in the tool mounting groove 4. 1 and 2, the tightening pin holder 3 is provided with a large number of through holes 5a, 5a and 5b, 5b, in which the tightening pins 6a, 6a and 6 are provided.
b, 6b are inserted. Holes 5a and 5b
At the bottom of the tightening pin holder 3 forming the groove 4,
They are arranged in two rows in the longitudinal direction of the tightening pin holder. As is clear from Fig. 1, holes 5a, 5a and 5
b, 5b are in a zigzag arrangement.

An expansion body holder 7 having a groove 8 in the range of the tightening pins 6a and 6b is fixed to the back surface of the tightening pin holder 3. This groove is for accommodating a hose 9 that serves as an inflator, and the hose 9 is connected to a control valve 11 by flanges 10 attached to both ends thereof. The control valve 11 has a connection 12 for connection to a pressure source. The groove 8 further accommodates a washer 13 inserted between the head end surfaces of the pins 6a and 6b and the hose 9.

Also, a pair of holes 5a and 5 on the tightening pin holder 3
In the middle of b, there is a hole 1 with a bottom that opens to the hose 9 side.
4 is provided for one piece. A spring 15 is inserted into each bottomed hole 14, as shown in FIG. 3, to apply pressure between the bottom of the bottomed hole and the washer 13. Since the washer is pressed against the hose 9, in the absence of pressure in the hose, the hose is compressed somewhat by the pressure of the spring 15, and the tool 2 is completely free, making it easier to install and remove.

Thus, the tool fixing device according to the present invention functions as follows. That is, when the control valve 11 is operated to supply pressure fluid into the hose 9 after inserting the tool 2 into the mounting groove 4, the hose tries to expand, and the force directed toward the handle 2a of the tool is transferred to the washer. 1
3 to the pins 6a, 6b, and the tool is firmly fixed. In this case, an equal force is applied to the pins 6a and 6b at the same time, so that the tool is fixed in a stable state.

When replacing the tool, switch the control valve 11 to release the pressure inside the hose 9. Due to the action of the spring 15, the hose is slightly compressed, allowing the pins 6a, 6b to move towards the hose 9.

The handle 2a of the tool 2 can thus move within the groove 4 and the tool can be removed laterally.
When a new tool is installed and the hose 9 is pressurized again, the pin 6 pushes the handle 2a of the tool 2, and the tool is securely fixed to the beam.

The lower edge of the tightening pin holder 3 facing the cavity 4 is provided with a tool 2 to be inserted into the cavity.
A protrusion that engages with the protrusion formed along the upper edge of the handle 2a is formed to prevent the tool from falling downward and being pulled out. The tool is taken in and out of the cavity 4 along the longitudinal direction of the cavity 4, that is, along the lateral direction in FIG.

[Effects of the Invention] Since the present invention is constructed as described above, it is possible to stably fix a horizontally long tool, and to quickly and reliably change the tool with a simple operation. Moreover, the device according to the present invention is simple in construction and therefore inexpensive to manufacture, and is structurally robust so that it can be used for a long time without failure. It can be used.

Furthermore, the device according to the present invention can be used in machines with conventional screw-type fixing devices, as long as the shape and dimensions of the tightening pin holder are made to be the same as those used in the past. Since it can be replaced as is, there is no need to change the machine tool itself, making it extremely economical.

The configuration of the present invention is not limited to the above-mentioned embodiments, but can be applied to tool holding parts of many machine tools that use various tools, and can be adapted to suit the tools and machines. You are free to make design changes as necessary within the scope of the purpose of the present invention,
The present invention encompasses all of them.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing an embodiment of a tool fixing device according to the present invention. Figure 2 shows the first
It is a sectional view along the line AA in the figure. Figure 3 shows
FIG. 2 is a sectional view taken along line BB in FIG. 1; 1... Tool mounting beam, 2... Tool, 3... Tightening pin holder, 4... Empty, 5a, 5a, 5b,
5b... Through hole, 6a, 6a, 6b, 6b... Tightening pin, 7... Expanding body holder, 9... Expanding body (hose), 11... Control valve, 13... Washer, 14...
...Bottomed hole, 15...Compression spring.

Claims (1)

[Scope of Claims] 1. A press brake tool fixing device comprising the components described in the following items (a) to (f). (a) Beam 1 to which tool 2 is attached. (b) A plurality of tightening pins 6a, 6b each consisting of a head and a body. (c) The tool 2 is attached to the edge of the beam 1 so as to form a space between the tool attachment beam 1 and the handle 2a of the tool 2, and the lower edge facing the space is provided with the tool 2. A protrusion is formed along the upper edge of the handle of the tool to be inserted into the cavity, and a protrusion is formed that engages with the protrusion to prevent the tool from falling downward;
and a tightening pin holder 3 that holds the plurality of tightening pins so that they can slide freely in their respective axial directions and such that the end portions of their bodies can come into contact with the handle portion 2a. (d) An expandable body 9 that is long and hollow, and whose cross section expands and contracts depending on internal pressure. (e) An expansion body holder installed parallel to the longitudinal direction of the clamp pin holder 3 and having a groove for accommodating the expansion body 9 so as to be able to contact and pressurize the heads of the clamp pins 6a and 6b at least when the expansion body is inflated. 7. (f) A device for supplying fluid into the expansion body 9 and controlling its pressure. 2. The tool fixing device according to claim 1, wherein the tool is a bending tool or a bending die. 3. The tool fixing device according to claim 1 or 2, wherein the through holes are arranged in two rows in a zigzag pattern along the longitudinal direction of the tightening pin holder 3. 4. Tool fixation according to claim 1, 2 or 3, characterized in that a freely movable washer is inserted between the head end surfaces of the tightening pins 6a, 6b and the expandable body. Device. 5. The tightening pin holder 3 is provided with at least one bottomed hole that opens toward the expansion body, and a compression spring that applies pressure to the expansion body or washer is provided inside the bottomed hole. Claims 1, 2, and 3 are characterized in that:
The tool fixing device according to item 1 or 4. 6. A patent characterized in that the through holes are arranged in a line along the longitudinal direction of the tightening pin holder 3, and the tightening pin 6 has an expanded head that directly contacts the outer wall of the expansion body. Claim 1,
The tool fixing device according to item 2 or 5. 7. The above-mentioned expansion body is a hose housed in a groove of an expansion body holder 7 fixed to a tightening pin holder 3, and the hose is connected to a pressure source via a control valve. Range 1st, 2nd
The tool fixing device according to item 1, 3, 4, 5 or 6.