JPH0134691B2 - - 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 (g) below, namely: (a) a beam on which the tool 2 is attached, and (b) a head and a body, respectively. (c) a plurality of clamping pins attached to the end edge of the tool mounting beam so as to form a cavity into which the handle of the tool is inserted between the tool mounting beam; (d) a tightening pin holder that holds the attachment pins so that they can slide freely in their respective axial directions and that the ends of their bodies can come into contact with the handle of the tool; A tool dropout that is slidably attached to the tightening pin holder so as to protrude and engage a groove provided in the handle of the tool, and to be disengaged from the groove by pulling the other end. (e) an inflatable body that is long and hollow and whose cross section expands and contracts depending on internal pressure; and (f) an inflatable body that is attached parallel to the longitudinal direction of the tightening pin holder and that causes the inflatable body to tighten at least when the inflatable body is inflated. A tool fixing device for a press brake, comprising: an expandable body holder having a groove for accommodating the head of the pin so that it can be brought into contact with and pressurized; (g) a device for supplying fluid into the expandable body and controlling the pressure thereof; It can be achieved by doing so.

That is, first, the clamping pin holder of the tool fixing device for a press brake according to the present invention has a hole for slidably holding the clamping pin, and a hole formed by the tool mounting beam and the clamping pin holder. 〓
At least one or more through holes are provided that are open to the periphery.

Further, the tightening pin holder or the tool mounting beam is provided with at least one through hole for inserting the tool fall prevention pin, which opens into the air, and the tool fall prevention pin is slidably attached therein, and the tool fall prevention pin is slidably attached therein. One end of the falling-off prevention pin protrudes into the air by the action of a spring and engages with a groove provided in the tool, and is disengaged from the tool by pulling the other end. This prevents the tool 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 air, 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 inflatable 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. . To apply pressure evenly on each clamping pin and also to prevent the expansion body from being damaged or rapidly worn out.
It is best to insert a freely movable washer between the end face of the tightening pin and the expansion body.

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. It is also recommended that a compression spring exerting force be 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 pressing force on the tool is also released.

In cases where stability during fixation is not so required, or in the case of a tool with 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 sectional view schematically showing an embodiment of a tool fixing device according to the present invention.

The figure shows tool mounting beam 1 of a bending press machine.
A cross-section of the lower part of the figure and the main parts of the tool fixing device according to the present invention attached thereto is shown. 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 cavity 4 is formed by the lower part of the beam 1 and the tightening pin holder 3, into which the handle 2a of the tool is inserted. The tightening pin holder 3 is provided with a large number of through holes 5, 5 along its longitudinal direction (perpendicular to the paper surface), into which the tightening pins 6, 6 are inserted.

An expansion body holder 7 having a groove 8 capable of accommodating the head of the tightening pin 6 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. A washer may be interposed between the head end surfaces of the tightening pins 6, 6 and the hose 9, if necessary. When a washer is interposed, the tightening pin holder 3 is provided with at least one hole with a bottom that opens toward the side of the expansion body, and the inside of the bottom hole is provided with pressure against the expansion body or the washer. It is also possible to provide a compression spring that adds .

In addition, the through holes 5, 5 for inserting the tightening pins,
It is also recommended to arrange the tightening pins in two rows in a zigzag pattern along the longitudinal direction of the tightening pin holder to stabilize the fixing force to the handle 2a of the tool.

A through hole 13 is provided in the lower part of the tightening pin holder 3 for slidably inserting a pin 15 to prevent the tool 2 from falling off, and a spring 14 is attached around the pin 15. be. Therefore, the tip of the pin 15 normally protrudes into the air 4 due to the pressure of the spring 14, and
It fits into the groove 2b provided in the section a.

Thus, the tool fixing device according to the present invention functions as follows. That is, after inserting the tool 2 into the mounting groove 4, if the control valve 11 is operated to supply pressure fluid into the hose 9, the hose 9 will try to expand, and the hose 9 will expand against the heads of the clamping pins 6, 6. , exerts a force in the direction of the handle 2a of the tool 2, and the handle 2a of the tool 2 is firmly pressed and fixed by the tips of the clamping pins 6, 6. In this case, the pins 6, 6 are simultaneously applied with equal force by the long hose 9, so that the tool is stably fixed.

When replacing the tool, the control valve 11 is switched to release the pressure in the hose 9 and release the pressing force exerted by the tightening pins 6, 6 on the handle portion 2a of the tool. In that case, all the tightening pins are loosened at once by operating the control valve 11, but the falling-off prevention pin 15
Since the tip 15a of the tool fits into the groove 2b of the tool, there is no risk of the tool falling off. Therefore, the operator can pull out the tool 2 while pulling the head of the falling-off prevention pin 15 outward (to the left in the figure) by hand.

Note that when inserting a tool, the head of the pin 15 for preventing falling may be pulled, but the tip of the pin 15 has a diagonal notch 15 as shown in the figure.
If a is provided, the pin 15 will automatically slide to the left when the tool 2 is pushed in from below.
When the tool reaches the groove 2b, it returns under the pressure of the spring 14 and fits into the groove 2b, which is convenient.

When a new tool is attached and the hose 9 is pressurized again, the tightening pin 6 pushes the handle 2a of the tool 2, and the tool is securely fixed to the tool attachment beam 1.

In the illustrated embodiment, the falling-off prevention pin 15 is attached to the side of the tightening pin holder 3, but it may also be attached to the lower part of the tool attachment beam 1.

〔Effect of the invention〕

Since the present invention is configured as described above, the present invention provides a tool fixing device that can stably fix a long tool in the lateral direction, and that can quickly and reliably change tools with a simple operation. In addition, the device according to the present invention has a simple structure, can be manufactured at low cost, and is structurally robust, so that it can be used for a long 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.

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 sectional view schematically showing an embodiment of a tool fixing device according to the present invention. 1... Tool mounting beam, 2... Tool, 3... Tightening pin holder, 4... Empty, 5... Through hole, 6...
... Tightening pin, 7 ... Expansion body holder, 9 ... Expansion body (hose), 11 ... Control valve, 13 ... Through hole,
14... Spring, 15... Pin to prevent tool from falling off.

Claims (1)

[Scope of Claims] 1. A press brake tool fixing device comprising the components described in the following items (a) to (g). (a) Beam 1 to which tool 2 is attached. (b) A plurality of tightening pins 6 each consisting of a head 6a and a body 6b. (c) The plurality of tightening pins are attached to the end edge of the beam 1 so as to form a cavity 4 into which the handle 2a of the tool 2 is inserted between the tool attachment beam 1 and the plurality of tightening pins. Tightening pin holder 3 is held slidably in the axial direction of the tool so that the end of the body thereof can come into contact with the handle part 2a of the tool. (d) By the action of the spring 14, the tip protrudes into the cavity 4 and engages with the groove 2b provided in the handle 2a of the tool, and by pulling the other end, the engagement with the groove 2b is made. A pin 15 for preventing a tool from falling off is slidably attached to the tightening pin holder 3 so as to be released. (e) An expandable body 9 that is long and hollow, and whose cross section expands and contracts depending on internal pressure. (f) An expansion body holder 7 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 contact and pressurize the head 6a of the clamp pin 6 at least when the expansion body is expanded. . (g) A device for supplying fluid into the expansion body 9 and controlling its pressure. 2. The press brake tool fixing device according to claim 1, wherein the tool is a bending tool or a bending die. 3. The press brake tool fixing according to claim 1 or 2, wherein the tightening pin insertion through holes are arranged in two rows in a zigzag pattern along the longitudinal direction of the tightening pin holder. Device. 4. A tool fixing device for a press brake according to claim 1, 2, or 3, characterized in that a freely movable washer is inserted between the head end surface of the tightening pin and the expansion body. . 5 The tightening pin holder 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. A press brake tool fixing device according to claim 1, 2, 3, or 4, characterized in that: 6. Claims characterized in that the through holes are arranged in a line along the longitudinal direction of the tightening pin holder, and the tightening pin has an expanded head that directly contacts the outer wall of the expandable body. The press brake tool fixing device according to item 1, item 2, or item 5. 7. The inflatable body is a hose housed in a groove of an inflatable body holder fixed to a tightening pin holder;
Claims 1 and 2, characterized in that the hose is connected to a pressure source via a control valve.
The press brake tool fixing device according to item 3, 4, 5, or 6.