JPH0217797Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a workpiece holding device that holds a workpiece in the frame of a special machine for machining the workpiece, particularly a lift clamp type workpiece holding device. Regarding.

[Conventional technology]

In this type of workpiece holding device, the workpiece carried in from the side by a roller conveyor, etc.
The lifter is supported by the floating support mechanism at the upper end of the lifter and raised, and the upper surface of the workpiece is brought into horizontal contact with the reference metal fixed to the upper part of the machine frame, and the positioning device is activated to move the workpiece laterally. The workpiece is moved a little to position it in the same direction, and then the lifting force of the lifter is increased to hold the workpiece between the reference metal and the floating support mechanism.

[Problem that the invention attempts to solve]

In such a workpiece holding device, the workpiece does not move smoothly in the lateral direction due to friction between the floating support mechanism and the reference metal, so the lateral positioning accuracy of the positioning device is poor.
In particular, there is a problem in that the friction between the reference metal and the workpiece, which is generally located at a distance from the positioning device provided on the lower side, tends to cause twisting during the lateral movement, which adversely affects the positioning accuracy. The present invention solves the above problem by providing a roller device that comes into contact with the upper surface of the workpiece to keep the workpiece horizontal during positioning.

[Means for solving problems]

Therefore, as illustrated in the accompanying drawings, the workpiece holding device according to the present invention includes a lifter having a floating support mechanism 25 at the upper end that is movably supported on the machine frame 10 and supports the workpiece W carried in from the side. 20, and a drive device 30 for raising and lowering this lifter.
and a positioning device 40 for positioning the workpiece W supported by the lifter 20 in the lateral direction, and the upper surface Wa of the workpiece W is fixed to the upper part of the machine frame 10 by raising the lifter 20. In the workpiece holding device which presses against the reference metal 38 and clamps the workpiece between the reference metal and the floating support mechanism 25, a roller is guided and supported on the upper part of the machine frame 10 so as to be horizontally movable up and down. Bracket 5
0, and a horizontal axis 52 perpendicular to the lateral direction.
The driving device 30 includes a plurality of rollers 51 that are pivotally supported by the roller bracket 50 and can come into contact with the upper surface Wa of the workpiece W, and a spring 55 that urges the roller bracket 50 downward. The upper surface of the workpiece W supported by the lifter 20
The upper surface Wa is brought into contact with the plurality of rollers 51 to bend the spring 55, but does not come into contact with the reference metal 38.
It is characterized by performing a second stage operation of pressing.

[Effect]

The drive device 30 first performs the first stage operation to raise the lifter 20 supporting the workpiece W on the floating support mechanism 25 at the upper end, and lifts the upper surface of the workpiece W.
Wa is kept horizontal as it comes into contact with a plurality of rollers 51 that are pivotally supported by a roller bracket 50, but it is temporarily stopped in a state where it does not come into contact with the reference metal 38 yet.
In this state, the positioning device 40 operates to move the workpiece W laterally and position it in the same direction, but at this time the rollers 51 roll and the workpiece W
Significantly reduces the frictional force between the Next, the drive device 30 performs the second stage operation, and the upper surface of the workpiece W is
Wa is pressed against the reference metal 38 to hold the workpiece W between the reference metal 38 and the floating support mechanism 25.

[Effect of idea]

As described above, according to the present invention, during lateral positioning by the positioning device, the top surface of the workpiece is kept horizontal by contacting the plurality of rollers, and at the same time, the friction between the top surface of the workpiece and the rollers is reduced. The forces are significantly reduced so that the workpiece moves smoothly without prying. Therefore, it is possible to improve the positioning accuracy of the workpiece held in the machine frame in the carrying-in direction.

〔Example〕

The illustrated embodiment will be explained below.

The machine frame 10 of this workpiece holding device mainly consists of the first
As shown in FIG. 2 and FIG. As shown in FIGS. 3 to 5, a pair of pilot bars 15, 15 are vertically provided between the support plates 14 and located on the left and right sides of the front portion. As shown in FIGS. 1, 2, and 5, a pair of guide frames 17, 17 extending in the left-right direction are provided in the center of the machine frame 10 and are fixed to the back plate 11 and the front support plate 14. , the workpiece W is supported by a plurality of guide rollers 18 to 18 that are pivotally supported inside the upper edge of the workpiece W.
The equipment is designed to be brought in from one direction, left and right, and taken out in the other direction.

The lifter 20 is guided and supported so as to be movable up and down by a vertical guide cylinder 21 fixed to the center of the lower support plate 13, and a floating support mechanism 25 provided at the upper end thereof is located between the guide frames 17, 17. When the lifter 20 is lowered, the guide rollers 18 to 1
8, and when the lifter 20 is raised, it supports the workpiece W, as shown in FIGS. 1 and 2. The floating support mechanism 25 mainly includes, as shown in FIG.
A support 26 is rotatably supported by a horizontal pivot 27 at the upper end of the lifter 20, and pivots 29, 29 that are horizontally orthogonal to the pivot 27 on both sides of this support 26 support the work. It is composed of a pair of receivers 28, 28 that support the object W. As shown in FIG. 1, a drive device 30 for raising and lowering the lifter 20 has a wedge body 31 guided and supported by a horizontal guide tube 33 fixed to the machine frame 10 and perpendicular to the vertical guide tube 21. The wedge body 31 is the second
As shown in the figure, one surface is flat and there are provided unevenness 31a with an inclined rectangular cross section.
It is engaged with 0a. The drive cylinder 32 that moves the wedge body 31 forward and backward to raise and lower the lifter 20 using the unevenness 20a and 31a performs two stages of operation, and the details of the operation will be described later.

Next, as shown in FIGS. 2 and 3, the main parts of the positioning mechanism 40 that positions the workpiece W supported by the floating support mechanism 25 in the left-right direction include pilot bars 15, 1,
It is supported by a support body 41 that is guided and supported by 5 and raised and lowered by a lift cylinder 42 . A pair of mutually parallel left and right shafts 43, 43 are rotatably provided on a support cylinder 41a fixed to the support body 41. At each outer end thereof, there are levers 44, 4 extending inwardly from each other.
4 is fixed, and a lever 4 is located between the guide frames 17, 17 at each inner end of the shafts 43, 43.
Arms 45, 45 perpendicular to 4, 44 are fixed. The inner ends of the levers 44, 44 are biased upward via rods 49a by a spring 49 provided on a bracket 48 erected on the front support plate 14, and are also erected on the front support plate 14. Support frame 4
It is in contact with the tips of adjustment screws 47, 47 provided at 6. When the support body 41 is lowered by the lifting cylinder 42, the inner ends of the levers 44, 44 are pushed up relative to the shafts 43, 43, and the arms 45, 45 are moved by the clamping rollers 45a, 4 at their tips.
They remain open until the upper edges of the guide rollers 5a are located below the upper edges of the guide rollers 18-18.
When the support body 41 is raised by the lifting cylinder 42, the lever 44, as shown in FIGS.
The inner ends of the arms 44 are pushed down relative to the shafts 43, 43 by the tips of the adjustment screws 47, 47, and the arms 45, 45 are closed to each other and the clamping roller 45
Press a, 45a against the inward inner surface of the holes Wb, Wb,
As a result, the workpiece W is positioned in the left-right direction.

As shown in FIGS. 1 to 4, a rectangular frame-shaped roller bracket 5 is provided at the upper part of the machine frame 10.
0 is guided and supported on the upper part of the pilot bars 15, 15 through support parts 50a, 50a so as to be movable up and down in parallel in a horizontal state. This roller bracket 50 has four pivots 52 to 5 in the horizontal direction perpendicular to the left-right direction via support columns 53, 53a, and 53b.
2 is provided, and the four rollers 51-51 are all simultaneously moved by the pivot shafts 52-52 to the upper surface of the workpiece W.
It is pivotally supported so that it can come into contact with Wa. Springs 55, 55 are interposed between two spring receivers 56, 56 provided on the upper surface of the roller bracket 50 and two corresponding spring receivers 57, 57 fixed to the upper surface plate 12. The roller bracket 50 is urged downward, and this urging force causes the support parts 50a, 50 of the roller bracket 50 to move in the free state.
a is in contact with stopper rings 15a, 15a fixed to pilot bars 15, 15, and roller bracket 50 is at the position indicated by two-dot chain line A in FIG.

Next, the operation of the above embodiment will be explained.

With the lifter 21 lowered and the arms 45, 45 of the positioning device 40 opened to the maximum, the workpiece W is placed on the guide rollers 18 of the guide frame 17 and carried from the left to the center of the machine frame 10. In this state, the drive cylinder 32 performs the first stage operation to raise the lifter 20, and supports the workpiece W by the floating support mechanism 25 at its upper end so that its upper surface Wa comes into contact with the rollers 51 to 51. The roller bracket 50 is at the position indicated by the two-dot chain line B in FIG.
Wa is elastically urged by the rollers 51 to 51, but is raised until it reaches a position where it does not yet come into contact with the reference metals 38 to 38, and then stopped once. Workpiece W
is supported by the floating support mechanism 25, so it is slightly tilted in the free state, but due to the above operation, the upper surface Wa is
Since the workpiece W is elastically abutted against the workpiece W, the workpiece W is kept in a horizontal state. In this state, the positioning device 40 operates and the floating support mechanism 2
5 and the workpiece W held between the rollers 51 to 51
to the left and right to perform positioning in the same direction. During this movement, the rollers 51 to 51 roll to reduce the frictional force between them and the workpiece W, so that the workpiece W does not tilt due to prying, and the movement is performed smoothly. Next, the drive cylinder 32 performs a second-stage operation to further raise the lifter 20 and move the upper surface Wa of the workpiece W to the reference metal 38.
to press. In this state, the roller bracket 55 rises against the spring 55 to the position indicated by the solid line in FIG. This completes the holding of the workpiece W in the machine frame 10, and then predetermined machining is performed. When the machining is completed, the arms 45, 45 of the positioning device 40 are opened, the lifter 20 is lowered, and the workpiece W is placed on the guide rollers 18 to 18 and carried out to the right.

In the workpiece W of this embodiment, the lower surface supported by the floating support mechanism 25 remains as cast, and the upper surface Wa that contacts the rollers 51 to 51 remains as cast.
has been processed.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the workpiece holding device according to the present invention, in which FIG. 1 is a central front sectional view corresponding to the - sectional view in FIG. 2, and FIG. 2 is the - sectional view in FIG.
A sectional view, Figure 3 is a front view, and Figure 4 is a - of Figure 1.
The sectional view, FIG. 5, is a - sectional view of FIG. 1. Explanation of symbols, 10...Machine frame, 20...Lifter,
25... Floating support mechanism, 30... Drive device, 40... Positioning device, 50... Roller bracket, 51... Roller, 52... Pivot, 55
...Spring, W...Workpiece, Wa...Top surface.

Claims (1)

[Scope of utility model registration request] a lifter that is movably supported on a machine frame and has a floating support mechanism at its upper end that supports a workpiece carried in from the lateral direction; a drive device that raises and lowers the lifter; A positioning device is provided for directional positioning, and when the lifter rises, the upper surface of the workpiece is pressed against the reference metal fixed to the upper part of the machine frame, and the workpiece is moved between the reference metal and the floating support mechanism. In the workpiece holding device sandwiched between the workpieces, there is a roller bracket that is guided and supported on the upper part of the machine frame so as to be able to rise and fall in a horizontal state, and a The driving device includes a plurality of rollers that can come into contact with the upper surface of the workpiece, and a spring that biases the roller bracket downward, and the driving device brings the upper surface of the workpiece supported by the lifter into contact with the plurality of rollers. A workpiece holding device characterized by performing a first stage operation in which the spring comes into contact with the reference metal but does not come into contact with the reference metal, and a second stage operation in which the same upper surface is pressed against the reference metal.