JPH0112939Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a workpiece clamping device used in machining centers and the like.

<Prior art> Workpieces machined by machining centers are often rectangular, so when clamping such workpieces onto a workpiece table, multiple clampers are arranged around the outer periphery of the workpiece placement area, and each The workpiece is clamped by pressing the clamper against the workpiece using a tightening mechanism consisting of bolts and nuts fixed on a jig.

<Problems to be solved by the invention> However, in such conventional ones,
Since it is necessary to operate the tightening mechanism provided on each clamper, there is a problem that the clamping operation is troublesome and time-consuming.

<Means for Solving the Problems> The present invention includes a plurality of clamp shafts on the outer periphery of the workpiece picking position on the workpiece support plate, the upper end of which is attached with a clamp member, and the lower end of which passes through the workpiece support plate. The lower ends of the plurality of clamp shafts are engaged with an interlocking plate arranged vertically movably between the fixed base and the workpiece support plate while restraining their axial movement. A connecting member extending in the width direction of the interlocking plate is movably disposed between the plate and the workpiece support plate in parallel with the interlocking plate, and the connecting member and the connecting member are disposed at both ends of the connecting member. A first link connecting the workpiece support plate and a second link connecting the connecting member portion and the interlocking plate are provided to form a parallel link mechanism, and the connecting member is moved. a clamped state in which the first and second links are straight and the interlocking plate moves downward; and an unclamped state in which the first and second links are bent in a dogleg shape and the interlocking plate moves upward. This feature is characterized by the provision of an operating means for switching between the two states.

<Operation> When the connecting member is moved by the operating means to a state where the first and second links are in a straight line, the interlocking plate is lowered and each clamp shaft is lowered, thereby clamping the workpiece. be done. In this case, the connecting member, workpiece plate, and interlocking plate are connected to the first and second
Since the link forms a parallel link mechanism with the link, the interlocking plate descends while maintaining a parallel state, applying uniform clamping force to each clamper.

Further, when the connecting member is moved by the operating means to a position where the first and second links form a dogleg shape, the interlocking plate is raised thereby, and the clamp on the workpiece is released.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. 1 to 3, reference numeral 11 denotes a fixed base mounted on a workpiece table 10 of a machine tool, and a cylindrical intermediate member 12 is mounted on this fixed base 11. A workpiece support plate 16, to which a plurality of workpiece support blocks 13 and positioning reference pins 15 are attached, is fixed in parallel to the fixed base 11 at its upper end.
A plurality of workpieces W to be machined are mounted on this workpiece support plate 16.

A plurality of clamp shafts 17 are disposed on the outer periphery of the workpiece mounting position of the workpiece support plate 16 in a state perpendicular to the workpiece support plate 16, and are guided by the workpiece support plate 17 so as to be able to pivot. The lower end of each clamp shaft 17 is connected to a workpiece support plate 16.
The interlocking plate 18 is connected to the interlocking plate 18, which is disposed vertically movably between the fixed base 11 and the workpiece support plate 16, with only axial movement being restricted. On the other hand, a clamper 20 is attached to the upper end of each clamp shaft 17 with a pin 21 to allow axial movement within a predetermined range.
A nut 22 attached to the upper end of the clamp shaft 17
A disc spring 23 is disposed between the clamper 20 and the clamper 20, and a fixing bolt 25 is provided on the workpiece support plate 16 and corresponds to each clamper 20. It is arranged as follows. Therefore, clamp shaft 1
7 is moved downward, the clamper 20 is moved downward via the disc spring 23, and the workpiece W is clamped by the spring force of the disc spring 23.

Furthermore, sprockets 26 are attached to the portions of the clamp shaft 17 below the workpiece support plate 16, and a chain 27 is stretched between these sprockets 26, and a plurality of clampers 20 When one of the clampers 20 is manually rotated, the other clampers 20 are also rotated at the same time, and the plurality of clampers 20 can be easily rotated between the relief position and the clamping position where they do not interfere with attachment and detachment of the workpiece W. .

Next, the mechanism for moving the interlocking plate 18 up and down for clamping and unclamping the workpiece W will be explained. A connecting member 30 extending to the opposite side is arranged parallel to the interlocking plate 18 and movable up and down. As shown in FIG. 4, one end of this connecting member 30 is pivoted to a protrusion 16a formed on one side of the workpiece support plate 16 by a support shaft 31, and has an operating lever that acts as a first link. 32 is rotatably connected to the tip of the second link 36 by a pin 33, and the other end of the second link 36, which is pivotally supported to one side of the interlocking plate 18 by a pin 35, connects the pin 33. are rotatably connected through the Further, at the other end of the connecting member 30, one end of a first link 38 and a second link 39 are pivotally supported by a pin 40, as shown in FIG. 38 and 39, the other end of the first link 38 is pivotally connected via a pin 41 to a mounting portion 16b projecting downward from the other side of the workpiece support plate 16, and the second link 39 The other end is pivotally connected to the other side of the interlocking plate 18 via a pin 42 .

Furthermore, the operating lever 32 has a positioning shaft 4.
An engagement hole 46 into which the tip of the operating lever 32 can be inserted is formed, and a fixing plate 47 disposed along the rotation path of the operating lever 32 has an engaging hole 46 into which the distal end of the operating lever 32 can be inserted.
When the engagement hole 46 is moved to the clamp position shown by the solid line and the unclamp position shown by the two-dot chain line in the figure,
Corresponding through holes 48a and 48b are bored, and after rotating the operating lever 32 to the clamp position and the unclamp position, inserting the tip of the positioning shaft 45 into the through holes 48a and 48b, respectively. , its tip reaches the engagement hole 46 of the operating lever 32 and restricts rotation of the operating lever 32.

When clamping the workpiece W in the workpiece clamping device configured as described above, after positioning the operating lever 32 at the unclamping position shown by the two-dot chain line, one of the plurality of clampers 20 is rotated to remove all the clampers 20. After setting the angular position to an angle that does not interfere with the attachment of the workpiece W, the workpiece W is attached. Thereafter, the clamper 20 is rotated to the limp position shown by the solid line in FIG. 1, the operating lever 32 is rotated to the clamp position shown by the solid line, and the positioning shaft 45 is attached.

When the operation lever 32 is rotated to the clamp position, the connection point between the operation lever 32 and the second link 36 and the connection point between the first link 38 and the second link 39 change from a dogleg-shaped bent state to a straight state. As a result, the interlocking plate 18 is moved downward by a predetermined amount, and the plurality of clamp shafts 17 are moved to the lower end indicated by the solid line. When the clamp shaft 17 is moved to the lower end, the end of each clamper 20 that is not on the clamp side comes into contact with the fixing bolt 25, and the clamper 2
0 rotates in the direction of clamping the workpiece W via the disc spring 23, thereby clamping the workpiece W.

In this case, the workpiece support plate 16, the connecting member 30, and the interlocking plate 18 are connected by the operating lever 32, the second link 36, the first link 38, and the second link 39 to form a parallel link mechanism. Therefore, the interlocking plate 18 moves up and down while constantly maintaining a parallel state to the workpiece support plate 16, and can apply equal clamping force to the plurality of clampers 20.

Further, when removing the workpiece W, the operating lever 32 is rotated to the unclamping position shown by the two-dot chain line. As a result, the connection point between the operating lever 32 and the second link 36 and the connection point between the first link 38 and the second link 39 are bent into a dogleg shape, the interlocking plate 18 is raised, and the clamper 20 is moved as shown in the two-dot chain line. The workpiece W is lifted to the position shown by and the clamp on the workpiece W is released. Thereafter, the clamper 20 is rotated to a position where it does not interfere with the removal of the workpiece W, and the workpiece W is removed.

Note that the connecting member 30 may be moved horizontally using a cylinder device.

<Effects of the invention> As described above, in the present invention, the lower ends of the plurality of clamper shafts with clampers attached to the upper ends are attached to the interlocking plate, and the width of the interlocking plate is provided between the interlocking plate and the workpiece support plate. A connecting member extending in the direction is disposed parallel to the interlocking plate, and a first link connecting the connecting member and the workpiece support plate at both ends of the connecting member, and a first link connecting the connecting member and the workpiece support plate. A parallel link mechanism is formed by disposing a second link that connects the interlocking plate, and by moving the connecting member, the first and second links become straight, and the interlocking plate moves downward. Moving clamp state and first and second
Since the connecting point of the link is bent in a dogleg shape and the interlocking plate moves upward, it is possible to switch between the unclamped state and the unclamped state, so that multiple clampers can be put into the clamped state or unclamped state in one operation. In addition, since the interlocking plate that interlocks multiple clamp axes moves up and down while maintaining parallel to the workpiece support plate, the amount of descent of each clamp axle during clamping is constant, and multiple clampers can A uniform clamping force can be applied to the clamping force.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the workpiece clamping device, Fig. 2 is a sectional view taken along the - line arrow in Fig. 1, and Fig. 3 is a sectional view taken along the - line arrow in Fig. 1. 4 is a view in the direction of the arrow in FIG. 3, and FIG. 5 is a view in the direction of the arrow in FIG. 3. DESCRIPTION OF SYMBOLS 11... Fixed base, 16... Workpiece support plate, 17... Clamp shaft, 18... Interlocking plate, 20... Clamper, 23... Belleville spring, 25...
... Fixing bolt, 32 ... Operation lever, 36 ... Second link, 38 ... First link, 39 ... Second link, W ... Workpiece.

Claims (1)

[Scope of utility model registration request] A workpiece support plate is fixed at a fixed distance from a fixed base fixed on the workpiece table, and a clamp member is attached to the upper end of the workpiece support plate on the outer periphery of the workpiece mounting position. A plurality of clamp shafts are provided, the lower ends of which pass through the workpiece support plate, and the lower ends of the plurality of clamp shafts are connected to an interlocking plate that is vertically movably arranged between the fixed base and the workpiece support plate. A connecting member extending in the width direction of the interlocking plate between the interlocking plate and the workpiece support plate is movable parallel to the interlocking plate. By arranging
A first link connecting the connecting member and the workpiece support plate and a second link connecting the connecting member and the interlocking plate are disposed at both ends of the connecting member, and a parallel link is provided. forming a mechanism to move the connecting member to connect the first and second
an operating means for switching between a clamped state in which the link is straight and the interlocking plate moves downward; and an unclamped state in which the first and second links are bent in a dogleg shape and the interlocking plate moves upward. A workpiece clamping device characterized by: