JPH0615131B2 - Pallet clamp device with repelling prevention mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet clamp device used for a machine tool such as a machining cetane. The present invention relates to a pallet clamp device having a mechanism for preventing repulsion when stopped.

[0002]

2. Description of the Related Art Recently, in a machine tool such as a machining center having a work table, a pallet clamp device for positioning and fixing a work pallet with respect to a base block on the work table has been used. There is. By the way, the work pallet loaded onto the base block must first be stopped at a predetermined position, and then the work pallet positioning work and the clamp work are performed. Conventionally, the work pallet is stopped by providing a stopper on the work table that comes into contact with the loaded work pallet. When the work pallet is manually loaded, it is not possible to perform a constant load input, and therefore, when the work pallet load is too strong, the work pallet is pushed back or repelled, and the work load There is a risk that the pallet positioning work and clamping work may be hindered.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pallet clamp device for clamping a work pallet carried on a fixed base block on a work table of a machine tool to the base block. It is an object of the present invention to provide a pallet clamp device having a repelling prevention mechanism which can stably stop the work pallet at a predetermined position when the pallet is carried in and can be constructed at low cost.

According to the present invention, in a pallet clamping device having a clamping mechanism for clamping a work pallet carried on a fixed base block on a work table of a machine tool to the base block, the pallet clamping device is mounted on the base block. repellent return prevention mechanism for preventing the return repellent of the stop the carried-coming work pallet with stops at a predetermined position is provided, the repellent return prevention mechanism
The fixed hook provided on the work pallet side and the base hook
It is provided on the lock side and engages with the fixed hook.
Consists of a movable hook freely rotate between a disengaged position where the engagement position with the fixed hook and the detachable state, the movable hook comes is carried on base over scan block Wakupare
From the disengagement position to the engagement position
The work pallet is rotated to prevent the work pallet from being repelled.

[0005]

[Action] As apparent from the above configuration, in the pallet clamp device according to the invention, repellent return prevention mechanism becomes rotatable between an engaged position relative to the disengaged position and said work pallet for the workpiece pallet The movable hook is rotated from the disengaged position to the engaged position by contact with the work pallet to prevent the work pallet from being repelled. Since the work pallet is engaged with the work pallet by the contacting action with the work pallet, the work pallet is reliably and stably prevented from repelling.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment of the pallet clamp device according to the present invention. Referring to these figures, a manual type pallet clamp device has a base block 11 fixed to a work table 1 of a machine tool such as a machining center. Here, the base block 11 includes a stopper 12 and a tightening bolt 13
With, the work table 1 can be fixed at a desired position.

The pallet clamp device is a work pallet 2
Mechanism 14 for clamping the work pallet 2 to the base block 11, a positioning mechanism 15 for positioning the work pallet 2 with respect to the base block 11, and a repelling prevention mechanism for preventing the work pallet 2 from repelling. 16 and
A manual operation lever 17 is provided.

The clamp mechanism 14 has a clamp plate 18 provided on the base block 11. As shown in FIG. 3, a downwardly extending guide pole 19 is fixed to the clamp plate 18, and the guide pole 19 is slidably fitted in a guide hole 20 provided in the base block 11.

As shown in FIG. 2, the clamp plate 18
A plurality of rollers 21 are arranged in two rows along the supply direction of the work pallet 2. As can be seen from FIG. 1, the outer peripheral surface of the roller 21 projects upward from the upper surface of the clamp plate 18, but does not project downward from the lower surface of the clamp plate 18.

As shown in FIG. 1, a pair of leg portions 3 and 4 are provided on the lower surface of the work pallet 2. Legs 3,
4 extends below the work pallet 2 and along the supply direction of the work pallet 2. Ribs 3a and 4a extending inward are provided at the lower ends of the legs 3 and 4. The clamp plate 18 is vertically displaceable with respect to the base block 11, and when the clamp plate 18 is displaced upward, the clamp mechanism 14 is in an unclamped state. At this time, the roller 21 contacts the lower surface of the supplied work pallet 2 to support the work pallet 2. At this time, the lower surface of the clamp plate 18 has ribs 3a,
Ribs 3a, 4 which are located above and apart from 4a.
The lower surface of a is separated from the upper surface of the base block 11 and is located above it. Therefore, the supplied work pallet 2 is smoothly guided by the roller 21. On the other hand, when the clamp plate 18 is displaced downward, the clamp mechanism 14
Is clamped, and the ribs 3a of the work pallet 2 are
4a is clamped by the lower surface of the clamp plate 18 and the upper surface of the base block 11. At this time, the roller 21 separates from the lower surface of the work pallet 2.

An operating shaft 22 extending in a direction orthogonal to the supply direction of the work pallet 2 is rotatably supported on the base block 11. The manual operation lever 17 is fixed to one end of the operating shaft 22. As shown in FIGS. 1 and 3,
An eccentric cam 23 is fixed to the operating shaft 22 at approximately the center of the pallet clamp device, and a link 24 fitted to the eccentric cam 23 is pivotally attached to the clamp plate 18 by a pivot pin 25. When the actuating shaft 22 is rotated by the manual operation lever 17, the eccentric cam 23 acts so that the clamp plate
18 is displaced vertically with the link 24, which causes
It switches to the unclamped state and the clamped state described above.

As shown in FIGS. 2 and 4, the positioning mechanism 15 has a pair of positioning pins 26. The positioning pin 26 is slidably fitted in the boss portion 27 provided on the base block 11, and the boss portion 27 is fixed to the clamp plate 18.
It is loosely fitted in the hole 28 formed in. Work palette 2
Is formed with a positioning hole 2a that can be fitted into the positioning pin 26, and the work pallet 2 is positioned with respect to the base block 11 by the engagement of the pin 26 with the hole 2a.

As shown in FIG. 1, the operating shaft 22 is provided with a pair of cams 29 for vertically moving the positioning pins 26. As shown in FIG. 4, the cam 29 is a positioning pin.
It has a claw 30 that engages with the notch 26a of 26. The cam 29 is rotatably fitted to the operating shaft 22. The cam 29 is formed with a slit 29a in the circumferential direction, and the operating shaft 22 is provided with a pin 31 located in the slit 29a. In FIG. 4, the positioning pin 26 is fitted in the positioning hole 2a of the work pallet 2, and the manual operation lever 17 is at the position of reference numeral A in the drawing. At this time, the clamp mechanism 14 is in a clamped state. When the manual operation lever 17 is rotated counterclockwise in the figure, the operating shaft 22 rotates counterclockwise together with the manual operation lever 17, but while the pin 31 moves in the slit 29a,
The cam 29 is stationary and therefore the locating pin 26 is also stationary in the position shown. When the manual operation lever 17 further rotates, the cam 29 receives the action of the pin 31 and rotates counterclockwise to push the positioning pin 26 downward. When the manual operation lever 17 is in the position of reference numeral B in the drawing, the clamp mechanism 14 is in the unclamped state, and the positioning pin 26 is separated from the positioning hole 2a of the work pallet 2.

Referring to FIGS. 2 and 3, the repelling prevention mechanism 16 is provided with a movable hook 32. The movable hook 32 is pivotally supported by a bracket 33 provided on the base block 11.
It is rotatably supported via 34. The movable hook 32 has a stopper 35, and the stopper 35 can come into contact with the fixed hook 5 provided at the end of the work pallet 2. The movable hook 32 is switched between a position where it engages with the fixed hook 5 of the work pallet 2 (a position indicated by reference symbol C in FIG. 3) and a position where it disengages from the fixed hook 5 (a position indicated by reference symbol D in FIG. 3). It is possible.

On the side surface of the movable hook 32, two recesses 32a,
32b is formed. Although not shown, the bracket 33 holds balls that can be engaged with the recesses 32a and 32b and is urged toward the side surface of the movable hook 32 by a spring. , 32b, so that the movable hook 32 moves to the engaging position C and the disengaging position D.
It is designed to be held at. When the fixed hook 5 of the work pallet 2 supplied on the pallet clamp device pushes the stopper 35 of the movable hook 32 when the movable hook 32 is in the disengaged position D, the movable hook 32 rotates around the pivot pin 34. It moves to the engagement position C and the work pallet 2
To prevent retreat, that is, repulsion.

As shown in FIG. 3, the base block 11 is provided with a push rod 36 capable of contacting the movable hook 32 so as to be slidable in the longitudinal direction. The operating shaft 22 is provided with an operating cam 37 that can come into contact with the push rod 36. When the manual operation lever 17 is in the unclamp position B (FIG. 4), the operating cam 37 is in the position E in FIG. 3, and when the manual operation lever 17 is moved from the unclamp position to the clamp position A, The actuating cam 37 moves from the position E to the position F, and the movable hook 32 at the engagement position C is pressed via the push rod 36 in the meantime to switch the movable hook 32 from the engagement position C to the disengagement position D.

In the pallet clamp device having the above structure, as can be seen from the above description, when the work pallet 2 is supplied onto the pallet clamp device and its fixed hook 5 is pressed against the stopper 35 of the movable hook 32, it is moved. The hook 32 engages with the fixed hook 5 to prevent the work pallet 2 from being repelled. Next, when the manual operation lever 17 is moved from the unclamp position B to the clamp position A, the positioning pin 26 is fitted into the positioning hole 2a of the work pallet 2 to position the work pallet 2 at a predetermined position and the eccentric cam. The clamp plate 18 presses the work pallet 2 against the base block 11 by the action of 23 to clamp the work pallet 2, and the action of the actuating cam 37 and the push rod 36 causes the movable hook 32 to move from the engagement position C to the disengagement position D. Return to.

When the processing of the work on the work pallet 2 is completed, the manual operation lever 17 is moved from the clamp position A to the unclamp position B. As a result, the clamp mechanism 14 is switched to the unclamped state, and the positioning pin 26 of the positioning mechanism 15 is disengaged from the positioning hole 2a of the work pallet 2. At this time, the bounce prevention mechanism has already been
Since the 16 movable hooks 32 are separated from the fixed hooks 5 of the work pallet 2, the work pallet 2 can be immediately taken out from the pallet clamp device after the manual operation lever 17 is moved to the unclamp position B.

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment of the above embodiment,
Various changes can be made to the components within the scope of the invention described in the claims. In particular, various changes can be made to the means for transmitting the acting force of the manual operation lever to the positioning mechanism, the clamp mechanism, the repelling prevention mechanism, and the like. Further, an operation portion for separating the movable hook of the repelling prevention mechanism from the fixed hook of the work pallet may be provided separately from the manual operation lever for the positioning mechanism and the clamp mechanism.

[0020]

As is apparent from the above description, in the pallet clamp device according to the present invention, the movable hook is engaged with the work pallet by the abutting action of the work pallet, and the work pallet is repelled. Since the return is reliably and stably prevented, the subsequent positioning work and clamping work of the work pallet can be carried out promptly, thereby improving the work efficiency. Further, since the pallet clamp device according to the present invention does not require an actuator or the like that requires a drive source such as hydraulic pressure, pneumatic pressure, or electricity, it can be provided at a low cost and can be used for existing machining centers and the like. There is also an advantage that the machine can be installed later.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pallet clamp device according to an embodiment of the present invention taken along line I-I in FIG.

FIG. 2 is a partially cutaway plan view of the pallet clamp device shown in FIG.

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 ... Work table 2 ... Work pallet 2a ... Positioning hole 5 ... Fixed hook 11 ... Base block 14 ... Clamp mechanism 15 ... Positioning mechanism 16 ... Repelling prevention mechanism 17 ... Manual operation lever 18 ... Clamp plate 22 ... Working shaft 23 ... Eccentricity Cam 24 ... Link 26 ... Positioning pin 29 ... Cam 32 ... Movable hook 35 ... Stopper 36 ... Push rod 37 ... Actuating cam

Claims (3)

[Claims] 1. A clamp mechanism (14) for clamping a work pallet (2) carried on a fixed base block (11) on a work table (1) of a machine tool to the base block (11) . In the pallet clamp device including: a work pallet (2) carried on the base block (11) is stopped at a predetermined position, and a repulsion preventing mechanism (16) for preventing repulsion at the time of the stop is provided. This repulsion prevention mechanism (16) is provided and the work palette is
Fixing hook (5) provided on the side (2) and the base
The fixed hook provided on the side of the block (11) and
(5) Engagement position (C) that engages with the fixing hook
(5) and a movable hook (32) which is rotatable between a detached position (D) in a detached state, and the movable hook (32) is carried onto the base block (11).
With the fixed hook (5) of the coming work pallet (2)
From the disengaged position (D) to the engaged position by abutting
A pallet clamp device which is rotated by (C) to prevent the work pallet (2) from being repelled. 2. The pallet clamp device according to claim 1, wherein the clamp mechanism (14) rotates the movable hook (32) from the engagement position (C) to the disengagement position (D) when the clamp is released. A pallet clamp device characterized in that it is interlocked with the repelling prevention mechanism (16) so as to move. 3. The pallet clamp device according to claim 1, wherein the movable hook (32) is detached from the movable hook (32).
Stop at each of the position (D) and the engagement position (C)
The movable hook (32) has two
The depressions (32a, 32b) are formed, and the depressions (3
2a, 32b) has the movable hook (32) detached from it.
When placed in position (D) and said engagement position (C)
A pallet clamp device characterized in that a urging ball is engaged .