JP5299087B2 - Clamping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp device capable of effectively clamping a workpiece, and capable of improving working efficiency. <P>SOLUTION: The clamp device 1 includes a supporting part 10 tiltably supported; a placement part 20 supported by the supporting part 10 so as to be vertically movable and downward moved by the weight of the workpiece W when the workpiece W is placed; an arm 40 rotatably supported by the supporting part 10, approached to the placement part 20 when being rotated to a first direction, separated from the placement part 20 when being rotated to a second direction opposite from the first direction, connected to the placement part 20, and rotated to the first direction accompanied by downward sliding of the placement part 20 which is caused by placement of the workpiece W on the placement part 20, and fastening and clamping the workpiece W placed on the placement part 20 with the placement part 20; and a pendulum 50 regulating upward movement of the placement part 20 when the supporting part 10 is tilted and the placement part 20 moves upward in the state that the workpiece W is clamped. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a clamping device.

2. Description of the Related Art Conventionally, in an automobile production line, when a workpiece is a relatively heavy member such as an automobile engine, assembly work for assembling various parts to the workpiece is performed in a state where the workpiece is clamped (fixed) by a clamp device. At this time, when the parts are assembled to the lower part of the workpiece, the workpiece may be appropriately tilted so that the assembling work can be performed smoothly. On the other hand, since the tilted work is likely to fall, the clamping device needs to maintain the clamped state when the work is clamped in a tilted state.
The technique of the clamping device that clamps and holds the workpiece in a tilted state in this manner is known. For example, it is described in Patent Document 1.
The clamp device described in Patent Document 1 rotates an arm by a driving mechanism (a cylinder portion including a piston that is displaced under the action of pressure fluid). Then, the arm is rotated until it abuts against the work, thereby securely clamping the work. By clamping using the drive mechanism in this way, the workpiece can be held even in an inclined state.
However, when the workpiece is clamped / unclamped, it is necessary to operate the drive mechanism each time, and the work efficiency deteriorates.

JP 2002-160134 A

  The present invention provides a clamping device capable of efficiently clamping a workpiece and improving work efficiency.

  The clamp device according to claim 1 is a support column that is tiltably supported and a support member on which a workpiece is placed. The clamp device is supported on the support column so as to be movable up and down, and when the workpiece is placed, the workpiece And a support unit that is pivotally supported by the column, and is pivotally supported in the first direction so as to come close to the mounting unit and rotate in a second direction opposite to the first direction. When it moves, it separates from the above-mentioned placement part, and when connected to the above-mentioned placement part, it rotates in the first direction along with the downward movement of the above-mentioned placement part, and with the upward movement of the above-mentioned placement part, the above-mentioned It is comprised so that it may rotate in a 2nd direction, and when the said workpiece | work is mounted in the said mounting part and the said mounting part moves downward, it rotates in said 1st direction, An arm that clamps the workpiece placed between the placement portion and the workpiece, and the workpiece is clamped In the state, when the mounting section prior to the strut is inclined attempts to upward movement, those comprising a regulating member for regulating the upward movement of the placing section, the.

  The clamp device according to claim 2, wherein the restriction member is rotatably attached to the arm, and is configured to be rotatable in a third direction that is a direction of approaching and separating from the support column. Is a pendulum that moves away from the support column as it rotates in the first direction and moves closer to the support column as the arm rotates in the second direction, and the pendulum is formed in an arc shape. And a cam portion that is attached to the arm at a center position of the arc that forms the arc portion, and the column is inclined in the third direction when the workpiece is clamped, When the pendulum rotates in the third direction with respect to the support column by its own weight, the arc portion is in a posture to face the support column, and when the mounting portion attempts to move upward in this posture, the arc portion Before To restrict the upward movement of the placing section by abutting the post.

  4. The clamp device according to claim 3, wherein the pendulum has a side portion fixed to a surface facing the fourth direction which is a direction orthogonal to the third direction in the cam portion, and the fourth direction. When the column is inclined in the fourth direction in a state where the workpiece is clamped, the pendulum rotates in the fourth direction with respect to the column with its own weight, and the side When the mounting portion is in a posture facing the support column, and the mounting portion tries to move upward in this posture, the side portion is in contact with the support column, thereby restricting the upward movement of the mounting portion. .

  The clamp device according to claim 4, wherein the regulating member is swingably connected to the mounting portion described above, and includes a stopper portion that moves up and down together with the mounting portion, tilts together with the support column, and includes the stopper inside. A passage in which the stopper portion is slidable, and a cross-sectional area of a surface perpendicular to the direction in which the stopper portion slides in the passage is formed in the passage. A storage portion including a space larger than a cross-sectional area, and a step portion that is a portion where the passage and the space are continuous, and the stopper portion of the storage portion when the workpiece is clamped When the column is tilted in the space and the workpiece is clamped, the stopper portion swings with respect to the housing portion under its own weight, and the stopper portion faces the stepped portion. ,further When the mounting portion tries to move upward in the posture, the stopper portion comes into contact with the stepped portion, so that the movement of the stopper portion from the space into the passage is restricted, and the upper portion of the mounting portion is It restricts movement.

  According to the present invention, it is possible to efficiently clamp a work and improve work efficiency.

It is a schematic structure figure of a clamp device which is one embodiment of a clamp device concerning the present invention. It is a figure which shows a clamp mechanism. FIG. 3 is a side view of FIG. 2. It is a figure which shows operation | movement of a mounting part and an arm, (a) is a figure which shows "unclamp attitude | position", (b) is a figure which shows the movable direction of a mounting part and an arm, (c) is a figure. It is a figure which shows a "clamp attitude | position". It is a figure which shows a pendulum, (a) is the elements on larger scale of FIG. 2, (b) is the elements on larger scale of FIG. It is a figure which shows the operation | movement of an arm when changing an arm from a "clamp attitude | position" to an "unclamp attitude | position", (a) is a figure which shows a "clamp attitude | position", (b) is a figure of a pendulum by rotation of an arm. It is a figure which shows when a boundary part contact | abuts to a support | pillar, (c) is a figure which shows when an arm rotates to a fixed pin center, and a pendulum rotates to the center of a 1st pendulum pin, d) is a diagram showing an “unclamping posture”. FIG. 7 is a partially enlarged view of FIG. It is a figure which shows the procedure when clamping a workpiece | work, (a) is a figure which shows the time of mounting a workpiece | work on a mounting part, (b) is a clamp part of an arm adjoining a workpiece | work with the weight of a workpiece | work. It is a figure which shows the time when it rotates in the direction, and (c) is a figure which shows the time when it exists in the state clamped between the mounting part and the clamp part of the arm. It is a figure which shows when a workpiece | work is inclined to the right, (a) is a figure which shows when an arm is not rotating, (b) is an arm rotating, and the circular arc part of a cam part is a support | pillar. It is a figure which shows the time of contact | abutting. FIG. 10 is a partially enlarged view of FIG. It is a figure which shows when a workpiece | work is tilted ahead. It is a figure which shows when an arm rotates by tilting a workpiece | work ahead and the side surface of the side part is contact | abutting to the support | pillar. It is a figure which shows the position of each clamp mechanism, when using four clamp mechanisms. It is a figure which shows another embodiment of a clamp mechanism. It is a figure which shows the procedure when clamping a workpiece | work using the clamp mechanism shown in FIG. 14, (a) is a figure which shows the time of mounting a workpiece | work in a mounting part, (b) is the weight of a workpiece | work. It is a figure which shows when the clamp part of an arm is rotating in the direction which adjoins to a workpiece | work, (c) is a state where the workpiece | work is clamped by being pinched | interposed by the mounting part and the clamp part of an arm. FIG. It is a figure which shows the weight inside an accommodating member, (a) is a figure which shows that there is a weight in space by the workpiece | work being clamped, (b) is that the clamp state of a workpiece | work is cancelled | released. It is a figure which shows that there exists a weight in a channel | path. It is a figure which shows the weight inside an accommodating member, (a) is a figure which shows when a weight is swaying in space with the shaking and vibration of a mounting part, (b) is a figure where a weight is a lower end of a channel | path. It is a figure which shows the state currently used at the entrance. It is a figure which shows the weight inside an accommodating member, (a) is a figure which shows the attitude | position of the weight in the space when the clamp mechanism is inclined, (b) is a figure holding weight in the lower end inlet_port | entrance of a channel | path. FIG.

  Below, clamp device 1 which is one embodiment of a clamp device concerning the present invention is explained with reference to drawings.

  The clamp device 1 is a jig that clamps (fixes) a workpiece W (a relatively heavy member such as an automobile engine). For example, at the time of manufacturing an automobile, the workpiece W is clamped by the clamping device 1 and various types of processing such as assembling various parts (head cylinder, exhaust manifold, etc.) to the clamped workpiece W are performed.

As shown in FIG. 1, the clamp apparatus 1 includes a tilt mechanism 2, a base 3, two clamp mechanisms 4, and the like.
The tilt mechanism 2 is a support member that supports the base 3 and the clamp mechanism 4 so as to be rotatable by a predetermined angle in one direction (left-right direction in FIG. 1), and is fixed to the floor surface. The tilt mechanism 2 includes a shaft 2a that is rotatably supported, an operation unit 2b that rotates the shaft 2a by a predetermined angle, and the like.
The base 3 is a flat plate member, and a plurality of bolt holes and the like for fixing the clamp mechanisms 4 are formed at predetermined positions on the upper surface. The central portion of the lower surface of the base 3 is fixed to the shaft 2a of the tilt mechanism 2. By rotating the tilt mechanism 2 by operating the operation portion 2b, the base 3 is set at a predetermined angle with respect to the floor surface. Tilt. In addition, a plurality (at least three) of work support members 3 a that support the work W from below are fixed at predetermined positions on the upper surface of the base 3. The work support member 3a has a rod shape, one end is fixed to the base 3, the other end protrudes vertically upward with respect to the base 3, and the work W can be placed on the other end. Yes.
The clamp mechanism 4 is a device that supports and clamps (fixes) the workpiece W from below, and is fixed to a predetermined location (location where the bolt hole is formed) on the base 3. The clamp mechanism 4 is fixed to the base 3 using a fastener such as a bolt. In the clamp device 1, the two clamp mechanisms 4 are arranged so as to face each other.
Thus, by rotating the tilt mechanism 2, the base 3 and the clamp mechanism 4 are integrally rotated, and the clamp device 1 is held in an inclined state.

  As shown in FIGS. 2 and 3, the clamp mechanism 4 includes a support portion 10, a placement portion 20, a coil spring 30, an arm 40, and a pendulum 50.

The support unit 10 is a support member that supports the mounting unit 20, the coil spring 30, the arm 40, and the pendulum 50.
The support unit 10 includes a fixed unit 11, a support column 12, a support column protrusion 13, a shaft unit 14, and the like.

  The fixing part 11 is a flat plate-like member for fixing the clamp mechanism 4 to the base 3, and is provided at the lowermost part of the support part 10. The fixing portion 11 is provided with a plurality of through holes, and a bolt (not shown) is inserted into the through hole and screwed into a bolt hole (not shown) of the base 3, thereby clamping the mechanism 4. Is fixed to the base 3.

The support column 12 is a prismatic member provided so as to extend in the vertical direction. The lower end of the support column 12 is fixed to the upper surface of the fixed portion 11, and extends in the vertical direction with respect to the base 3. Note that the posture of the support column 12 when the support column 12 is in a vertical posture with respect to the floor surface and is not inclined is referred to as a “vertical posture”.
A column projection 13 is fixed to the upper end surface of the column 12, and a shaft portion 14 is similarly provided extending upward from the upper end surface.

The column protrusion 13 is fixed to the upper end surface of the column 12 and protrudes from the upper end of the column 12 to one side (left side in FIG. 2). A through-hole 13a penetrating in the vertical direction is formed on one side (right side in FIG. 2) of the column protrusion 13, and the shaft portion 14 is inserted into the through-hole 13a. Further, a notch 13b penetrating in the vertical direction is formed from the middle part of the pillar projecting part 13 to the side end part opposite to the side fixed to the pillar 12, and the inner periphery of the notch 13b. The middle part of the arm 40 is fitted on the side.
Further, pin holes 13c and 13c for inserting fixing pins 45 for supporting the arm 40 are provided on the side (left side in FIG. 2) where the notch 13b of the column protrusion 13 is provided.
That is, by inserting the fixing pin 45 into the pin holes 13c and 13c in a state where the arm 40 is fitted to the inner peripheral portion of the notch 13b formed in the column protrusion 13, the arm 40 is fixed to the fixing pin 45. And is supported rotatably by the column protrusion 13.

The shaft portion 14 is a stepped shaft member provided so as to protrude upward from the upper end of the column 12. Specifically, the shaft portion 14 is configured as a shaft member having a two-step outer diameter formed such that the lower outer diameter is larger than the upper outer diameter, with the step portion 14a disposed in the middle of the upper and lower portions as a boundary. The
The mounting portion 20 can abut on the upper end surface of the step portion 14 a of the shaft portion 14, and a coil spring 30 is provided on the outer periphery of the shaft portion 14.

The placement unit 20 is a support member that supports the workpiece W from below, and has a shape that extends substantially parallel to the base 3 (the column protrusion 13). Specifically, a through hole 20a penetrating in the vertical direction is formed in the left and right middle part of the mounting part 20, and the shaft part 14 is inserted into the through hole 20a. Further, a cutout 20b penetrating in the vertical direction is formed from the middle part of the placement part 20 to one side end part, and the arm 40 is configured to penetrate the inner periphery of the cutout 20b. Yes.
The shaft portion 14 penetrates the through hole 20a, and the placement portion 20 is supported so as to be slidable in the vertical direction along the shaft portion 14. In addition, the internal diameter of the through-hole 20a is set according to the outer diameter of the smaller one among the outer diameters of the axial part 14 comprised with a step. For this reason, the mounting portion 20 slides upward from the step portion 14 a of the shaft portion 14. That is, the lowest point of the mounting portion 20 is set as a position where the step portion 14a is formed.
A protrusion 21 protruding upward is formed at one end (right end in FIG. 2) of the mounting portion 20. The protrusion 21 is a positioning member used when the work W is attached (placed) on the placement unit 20. Specifically, the workpiece W is placed on the placement portion 20 while the projection 21 and the workpiece hole for inserting the projection 21 formed on the workpiece W are engaged with each other. This is done by placing. When the work W is placed on the placement unit 20, the placement unit 20 slides downward with the weight of the work W. At this time, the loading of the workpiece W on the placement unit 20 may be supported by the placement unit 20 coming into contact with the stepped portion 14a and stopping. That is, you may comprise so that the workpiece | work W on the mounting part 20 may be supported by the step part 14a. And when supporting the workpiece | work W on the mounting part 20, according to the weight of the workpiece | work W, it is good also as a structure which uses only the step part 14a and does not use the above-mentioned workpiece support member 3a.
Further, a rotation pin 22 for rotating the arm 40 is fixed to a side end portion (left end portion in FIG. 2) where the notch 20b of the placement portion 20 is provided.

The coil spring 30 is wound around the shaft portion 14 in an annular shape, and is interposed between the placement portion 20 and the column protrusion 13.
The coil spring 30 is a spring member having a predetermined spring coefficient. When the coil spring 30 is compressed, the coil spring 30 generates an urging force from the column protrusion 13 toward the mounting portion 20 and urges the mounting portion 20 upward. Alternatively, it has a function of urging the arm 40 in the rotational direction as will be described later.

The arm 40 is a clamp member that clamps the workpiece W with the arm 40 and the mounting portion 20 interposed therebetween.
The arm 40 includes an arm main body 41, a clamp portion 42, a guide groove 43, and the like.

The arm main body 41 is a main member that constitutes the arm 40, and is a flat plate-like member that is formed in a bent shape having an inverted L shape when viewed from the front. The upper front end portion (upper right end portion in FIG. 2) of the arm body 41 is provided so as to protrude rightward to the same extent as the front end portion of the placement portion 20. The upper end of the arm body 41 is provided with a recess 44 having a shape that is recessed upward from its lower surface.
The middle part of the arm body 41 is supported by the support part 10 by being fixed to the column protrusion 13 by a fixing pin 45. The arm main body 41 can rotate around the fixing pin 45.

  The clamp portion 42 is a portion that protrudes downward from the upper end portion of the arm body 41, and the lower end portion of the clamp portion 42 is configured to be able to contact the workpiece W. That is, the work W is configured to be clamped by being sandwiched between the lower end surface of the clamp part 42 and the upper end surface of the mounting part 20. When the workpiece W is clamped, a gap of about several millimeters is formed between the workpiece W and the lower end surface of the clamp portion 42, and even when the thickness of the workpiece W varies due to the gap, The same clamping mechanism 4 can be used.

The guide groove 43 is an inclined groove provided in the upper and lower middle part of the arm body 41, and is a guide groove for transmitting the turning force from the rotation pin 22 to the arm body 41. A rotation pin 22 of the placement portion 20 is inserted into the guide groove 43, and the rotation pin 22 moves along the guide groove 43 as the placement portion 20 slides up and down. Thereby, the rotational power is transmitted from the rotation pin 22 to the arm main body 41 through the guide groove 43, and the arm 40 is rotated about the fixed pin 45. On the other hand, when the arm 40 is pivoted about the fixed pin 45, the rotational force is transmitted from the guide groove 43 to the pivot pin 22, and the mounting portion 20 slides in the vertical direction (FIG. 4). (See arrow A shown in (b)). As described above, when the arm 40 is rotated, an upward biasing force is applied from the coil spring 30 to the mounting portion 20, so that the biasing force of the coil spring 30 is applied to the pivoting operation of the arm 40.
At this time, the arm 40 is provided so as to be sandwiched between the inner peripheral portion of the notch 13b of the column protrusion 13 and the inner peripheral portion of the notch 20b of the mounting portion 20 as described above. The rotation of 40 is limited to the direction around the fixed pin 45 (see arrow B shown in FIG. 4B). Thus, the arm 40 can be rotated stably.
As shown in the order of FIG. 4A → (b) → (c), when the arm 40 rotates in the first direction around the fixing pin 45, the clamp part 42 approaches the mounting part 20 and the arm 40 Is separated from the support column 12. At the same time, the placement unit 20 slides downward.
As shown in the order of FIG. 4 (c) → (b) → (a), when the arm 40 rotates about the fixing pin 45 in the second direction opposite to the first direction, the clamp portion 42 is mounted. The arm 40 is separated from the mounting portion 20 and the lower end of the arm 40 is close to the support column 12. At the same time, the placement unit 20 slides upward.

Further, as shown in FIG. 2, a clearance groove 43a formed downward from the lower end portion is provided at the lower end portion of the guide groove 43, and the rotation pin 22 is fitted in the clearance groove 43a. In the state, the placement unit 20 can slide in the vertical direction without rotating the arm body 41.
And in this embodiment, the clamp part 42 adjoins the mounting part 20, and the clamp part 42 and the mounting part 20 clamped across the workpiece | work W mounted in the mounting part 20 (FIG. 4 (a) → (b) → (c)), the rotation pin 22 slides on the guide groove 43, moves to the clearance groove 43a, and is positioned in the clearance groove 43a. From this state, even if a force is applied to the clamp portion 42 in a direction away from the mounting portion 20, if this force is slight, the rotation pin 22 is caught by the clearance groove 43 a and the guide groove 43. The state of being positioned in the clearance groove 43a without being moved is maintained, and the rotation of the clamp portion 42 is restricted. Therefore, the clearance groove 43a prevents the clamp part 42 from being easily rotated by a slight force and separated from the placement part 20 in a state where the clamp part 42 and the placement part 20 are clamped with the workpiece W interposed therebetween. It is preventing.
Further, by providing the clearance groove 43a, when the workpiece W wobbles in a state where the clamp portion 42 and the placement portion 20 are clamped with the workpiece W sandwiched therebetween, the placement portion 20 follows the wobble of the workpiece W. Even if it moves up and down, the arm 40 reacts sensitively to the up and down movement of the mounting portion 20 to prevent it from rotating or wobbling.

  Further, the upper end portion of the shaft portion 14 of the support portion 10 can be brought into contact with the recess 44, and the recess 44 and the shaft portion 14 are configured to contact when the clamp mechanism 4 clamps the workpiece W. ing. Thereby, when the arm main body 41 is rotated to the rotation end, the concave portion 44 and the shaft portion 14 come into contact with each other, and the arm main body 41 is also supported by the shaft portion 14. Can be improved.

  In the following description, the clamp portion 42 is close to the placement portion 20, and the clamp portion 42 and the placement portion 20 can be clamped with the workpiece W sandwiched therebetween (FIGS. 1, 2, 3, and 5). 4 (c)) is referred to as a “clamping posture” of the arm 40, and the clamp portion 42 is sufficiently separated from the placement portion 20, and the protrusion 21 of the placement portion 20 (the workpiece W placed on the placement portion 20). ) And the clamp portion 42 are sufficiently separated from each other (see FIG. 4A) and referred to as an “unclamping posture”.

As shown in FIG. 2, the pendulum 50 is a restricting member that is disposed at the lower end of the arm 40 and holds the “clamping posture” of the arm 40 by restricting the rotation of the arm 40. The pendulum 50 is disposed so as to be in contact with one side surface (the left side surface in FIG. 2) of the support column 12, and restricts the rotation of the arm 40 by the contact of the pendulum 50 and the support column 12.
The pendulum 50 is rotatably attached to the lower end portion of the arm 40, and the pendulum 50 is suspended from the arm 40.
As shown in FIGS. 5A and 5B, the pendulum 50 includes a cam portion 51, side portions 52 and 52, and the like.

The cam portion 51 is a substantially flat plate-like member, and is formed in a substantially sector shape (substantially inferior arc semicircular shape) having a central angle slightly smaller than 180 ° when viewed from the front. In the upper portion of the cam portion 51, pin holes 51a and 51a through which the first pendulum pin 53 passes are formed.
An arc portion 51b, an inclined portion 51c, and a boundary portion 51d are formed on one side (the column 12 side) of the cam portion 51. The arc portion 51b extends in an arc shape (inferior arc shape) in the upper right direction (the column 12 side). The inclined portion 51c is connected to the upper right end portion of the arc portion 51b and is inclined to the left side (first pendulum pin 53 side). The boundary portion 51d is formed as a portion (boundary portion) where the arc portion 51b and the inclined portion 51c are continuous. The boundary 51d may be pointed, and may be a flat surface (chamfered surface) or a curved surface.
The first pendulum pin 53 (pin holes 51a and 51a) is located at the center position of the arc forming the arc portion 51b.

The side parts 52 and 52 are flat plate-like members having a rectangular parallelepiped shape, and are fixed so as to sandwich the cam part 51 from both the front and rear sides. That is, the cam part 51 and the side parts 52 and 52 are provided integrally, and are configured so that the posture can be changed integrally.
A pin hole 52 a through which the first pendulum pin 53 inserted through the cam portion 51 and the other side portion 52 passes is provided at the upper center of the side portion 52.
The end surface 52 b on the side of the support column 12 in the side portion 52 is formed as a flat surface and has a shape along the support column 12. The protruding position of the end surface 52b toward the support column 12 is set to be the same position as that of the cam portion 51.

The first pendulum pin 53 is connected to the arm main body 41 by the second pendulum pin 54 in a state of penetrating into a long hole 46 provided in the lower end portion of the arm main body 41. Further, the second pendulum pin 54 is provided so as to penetrate through the substantially central portion of the first pendulum pin 53 in the vertical and horizontal directions. More specifically, the second pendulum pin 54 extends in a direction orthogonal to the first pendulum pin 53, and the first pendulum pin 53 is located at a position where the first pendulum pin 53 is arranged at the upper and lower centers of the long hole 46. It penetrates the pin 53.
The first pendulum pin 53 is supported so as to be rotatable about the second pendulum pin 54 in the depth direction in FIGS. 3 and 5B.
Further, the long hole 46 is formed as a through hole formed in a substantially elliptical shape having a major axis in the vertical direction, and when the first pendulum pin 53 rotates around the second pendulum pin 54, the first hole It has a vertical length that prevents the pendulum pin 53 from contacting the inner wall of the long hole 46.

The second pendulum pin 54 penetrates the upper and lower central portions of the first pendulum pin 53. The first pendulum pin 53 (strictly speaking, the cam portion 51 and the side portions 52 and 52 supported by the first pendulum pin 53) can rotate around the second pendulum pin 54.
As described above, the cam portion 51 supported by the arm body 41 via the first pendulum pin 53 and the second pendulum pin 54 is in the direction of approaching and separating from the support 12 with the first pendulum pin 53 as the center (left and right). The second pendulum pin 54 is configured to be rotatable in a direction (front-rear direction) perpendicular to the direction of approaching and separating from the support column 12.

  Further, the thickness of the cam portion 51 (thickness in the depth direction in FIG. 5A) is set to be slightly thicker than the thickness of the support column 12 in the same direction (see FIG. 5B).

Further, the posture of the pendulum 50 when the support column 12 is in the “vertical posture” and the arm 40 is in the “clamping posture” is the vertical posture.
When the pendulum 50 is in the vertical posture, a gap is formed between the pendulum 50 (the boundary portion 51d of the cam portion 51 and the end surface 52b of the side portion 52) and the support column 12, and the pendulum 50 is not subjected to external force. It is hung on the arm 40 in a natural posture (it is hung by its own weight). Further, the boundary portion 51d is positioned below the first pendulum pin 53 and faces the support column 12 (see FIG. 5A).

  Hereinafter, a procedure for changing the arm 40 from the “clamping posture” to the “unclamping posture” in a state where the support column 12 is in the “vertical posture” will be described. That is, the clamping mechanism 4 clamps the workpiece W by rotating the arm 40 so that the procedure for unclamping the workpiece W from the clamped state or the projection 21 of the placement unit 20 can be seen in plan view. The procedure for making the workpiece W easy to clamp when performing the process will be described.

(1) As shown in FIGS. 6A and 6B, the arm 40 is lifted upward by gripping the vicinity of the clamp portion 42, so that the arm 40 is moved in the second direction around the fixing pin 45. The clamp portion 42 moves away from the placement portion 20 when the rotation is performed. At the same time, the pendulum 50 disposed at the lower end of the arm 40 (that is, disposed below the fixed pin 45) maintains the vertical posture (the boundary portion 51d of the cam portion 51 faces the column 12). In the state).
(2) When the rotation of the arm 40 is continued, the boundary portion 51 d of the cam portion 51 comes into contact with the support column 12. At this time, the action point (boundary portion 51d), which is a portion of the cam portion 51 that comes into contact with the support column 12, is located below the fulcrum (first pendulum pin 53) with reference to the extending direction of the support column 12. (See FIG. 7). Accordingly, when the arm 40 is further rotated from this state, the pendulum 50 can be easily rotated around the first pendulum pin 53. Specifically, at this time, the cam portion 51 can easily rotate in the direction in which the boundary portion 51d slides the side surface of the support column 12 downward. Therefore, it can be avoided that the cam portion 51 abuts on the support column 12 and stops between the lower end portion of the arm 40 and the support column 12 to act as a rotation stopper for the arm 40.
(3) As shown in FIG. 6C, when the arm 40 continues to rotate, the cam portion 51 rotates while sliding on the support column 12 as described above.
(4) Then, as shown in FIG. 6 (d), when the tip of the clamp portion 42 of the arm 40 comes to a position sufficiently away from the protrusion 21 of the mounting portion 20, the rotation of the arm 40 is stopped. . At this time, the posture of the arm 40 (positional relationship between the mounting portion 20 and the arm 40) is referred to as an “unclamped posture”.

As described above, when the support column 12 is in the “vertical posture” and the arm 40 is in the “clamping posture”, the arm 40 can be easily rotated to the “unclamping posture”. Thereby, the workpiece | work W in the clamp mechanism 4 can be attached or detached smoothly. As a result, even when a plurality of workpieces W are sequentially mounted on the placement unit 20 and parts are sequentially assembled to the workpieces W, the attachment and removal of the workpieces W to the placement unit 20 can be performed smoothly. It can be carried out.
As described above, since the thickness of the cam portion 51 is set to be larger than the thickness of the support column 12, even if the pendulum 50 comes close to the support column 12 as the arm 40 rotates, the cam portion 51 (boundary Only the portion 51 d) abuts on the column 12, and the side portion 52 (end surface 52 b) is prevented from abutting on the column 12.

Below, the procedure at the time of clamping the workpiece | work W with the clamp apparatus 1 containing the two clamp mechanisms 4 is demonstrated.
The clamp mechanisms 4 and 4 are arranged symmetrically about the center line of the base 3 (the axis 2a of the tilt mechanism 2) (see FIG. 1). In addition, a workpiece hole is formed in the workpiece W as a portion to be attached to the clamp mechanism 4 or 4, and projections 21 and 21 having shapes corresponding to the workpiece hole are formed on the clamp mechanism 4 or 4 side. Suppose that it is done.

(1) First, as shown in FIG. 8A, in the state where the support column 12 of each clamping mechanism 4 is in the “vertical posture” and the arm 40 is in the “unclamping posture”, the workpiece W is projected onto the protrusion 21. While being positioned by 21, the workpiece is placed on the placement portions 20 and 20, and each workpiece hole is engaged with the protrusion 21.
(2) As a result, as shown in FIGS. 8B and 8C, the placement portions 20 and 20 slide downward with the weight of the workpiece W, and the arms 40 and 40 move in the first direction. Is turned into a “clamping posture”, and the mounted portion of the workpiece W is clamped between the mounting portions 20 and 20 of the clamp mechanisms 4 and 4 and the clamp portions 42 and 42 of the arms 40 and 40. It becomes a state. At the same time, the pendulum 50 moves away from the support column 12 as the arms 40 and 40 rotate in the first direction, and the pendulum 50 that is in contact with the support column 12 moves away from the support column 12. The vertical posture is assumed.
In this way, the workpiece W is clamped by the clamping device 1.

  Hereinafter, the behavior of the clamp mechanisms 4 and 4 when the tilt mechanism 2 is tilted by operating the tilt mechanism 2 from the state in which the workpiece W is clamped by the clamp apparatus 1 will be described. For convenience of explanation, the following description will be made with the left-right direction in FIG. 9 defined as the left-right direction of the clamping device 1 and the workpiece W. There are two types of tilt mechanisms 2, one that can tilt the clamp device 1 in the left-right direction and one that can tilt in the front-back direction. Tilt in each direction.

From the “vertical posture” and the “clamping posture” (see FIG. 1), the operation unit 2b of the tilt mechanism 2 is operated, and the base 3 (supports 12 and 12) is moved to the right as shown in FIG. The workpiece W is tilted to the right, so that the parts can be smoothly assembled to the lower left portion of the workpiece W.
At this time, the mounting portions 20 and 20 and the arms 40 and 40 together with the support columns 12 and 12 and the workpiece W are also tilted to the right. On the other hand, the pendulums 50 and 50 hold the vertical posture without tilting. That is, the pendulums 50 and 50 rotate to the right with their own weights around the first pendulum pins 53 and 53 with respect to the support columns 12 and 12, and maintain the vertical posture. As a result, the midway part of the arc part 51 b of the pendulum 50 in the left clamp mechanism 4 is in a posture facing the column 12. At this time, since the arms 40 and 40 are tilted together with the support columns 12 and 12, the distance between the arms 40 and 40 and the support columns 12 and 12 is kept constant, so that the pendulum 50 attached to the arms 40 and 40. 50 (cam portions 51 and 51) are prevented from coming into contact with the support columns 12 and 12, and the pendulums 50 and 50 can maintain the vertical posture.
Here, as shown in FIG. 9B, when the workpiece W is tilted to the right, the workpiece W is rotated around a portion sandwiched between the clamp portion 42 and the placement portion 20 in the clamp mechanism 4 on the left side. In some cases, it moves and tries to tilt further to the right, and eventually falls off the clamping mechanisms 4 and 4 and falls to the right. At this time, the work W applies a force in a direction in which the left arm 40 (clamp portion 42) is pushed upward to push the left clamp portion 42 upward. As a result, the left clamp part 42 rotates upward (rotates in the second direction), and the left mounting part 20 attempts to slide upward. Further, the left mounting portion 20 slides upward by the elastic force of the coil spring 30, and the left clamp portion 42 tends to rotate upward. For this reason, in order to prevent the workpiece W from falling off the clamp mechanisms 4 and 4 and to maintain the “clamping posture”, it is necessary to restrict the upward rotation of the left clamp portion 42. That is, it is necessary to regulate the upward sliding of the left mounting portion 20.
Hereinafter, the operation of the left clamp mechanism 4 will be described. As described above, a force is applied in the direction in which the workpiece W pushes upward with respect to the clamp portion 42, and when this force becomes a predetermined value or more, the clamp portion 42 rotates upward about the fixed pin 45, and the placement portion 20 Slides upward. Then, with the upward rotation of the clamp portion 42 (sliding upward of the mounting portion 20), the lower end portion of the arm 40 approaches the support column 12, and the pendulum 50 is moved to the support column 12 while maintaining the vertical posture. The pendulum 50 comes into contact with the support column 12 in close proximity. At this time, as described above, the pendulum 50 is tilted to the right, whereas the pendulum 50 is in the vertical posture, and the middle portion of the arc portion 51b is in a posture facing the column 12, so that the cam portion 51 The midway part of the circular arc part 51 b contacts the support column 12, and the boundary part 51 d does not contact the support column 12. From this state, when the arm 40 is to be further rotated, the cam portion 51 is held by the support column 12 (stationary between the lower end portion of the arm 40 and the support column 12), and the clamp portion 42 is centered on the fixing pin 45. It is impossible to rotate upward (the lower end of the arm 40 cannot approach the support column 12), the upward rotation of the clamp part 42 is restricted, and the upward sliding of the mounting part 20 is restricted. That is, the cam portion 51 acts as a stopper that restricts upward sliding of the placement portion 20. As a result, the state in which the workpiece W is sandwiched between the clamp portion 42 and the placement portion 20 is maintained, and the “clamping posture” is maintained.
As described above, the thickness of the cam portion 51 in the front-rear direction is set to be slightly thicker than the thickness of the support post 12 in the front-rear direction. Contact with 12 is avoided.
Thus, even if the workpiece W is tilted to the right, the cam portion 51 of the left clamp mechanism 4 abuts on the support column 12 so that the “clamping posture” is maintained, and the workpiece W is placed on the clamp portions 42 and 42. The state sandwiched between the placement parts 20 and 20 is maintained. Therefore, the workpiece W is prevented from falling off the clamp mechanisms 4 and 4 and falling down.

From the “vertical posture” and the “clamping posture”, the columns 12 and 12 are tilted to the left, that is, the workpiece W is tilted to the left so that the parts can be smoothly assembled to the lower right portion of the workpiece W.
At this time, the placement units 20 and 20 and the arms 40 and 40 are tilted to the left together with the workpiece W. On the other hand, the pendulums 50 and 50 hold the vertical posture by rotating to the left with their own weights around the first pendulum pins 53 and 53 with respect to the columns 12 and 12 without tilting. As a result, the midway portion of the arc portion 51b of the pendulum 50 in the right clamp mechanism 4 is in a posture facing the support column 12.
Here, when the workpiece W is tilted to the left, the workpiece W is rotated around a portion sandwiched between the clamp portion 42 and the placement portion 20 in the left clamp mechanism 4 and further tilts to the left. As a result, it may fall out of the clamp mechanisms 4 and 4 and try to fall to the left. At this time, the middle portion of the arc portion 51b of the right cam portion 51 abuts on the right column 12, and the right cam portion 51 is held by the right column 12, and the upward rotation of the right clamp portion 42 is restricted. . That is, the upward sliding of the right mounting portion 20 is restricted. As a result, the “clamping posture” is maintained, and the workpiece W is prevented from falling off the clamping mechanisms 4 and 4 and falling down.

As shown in FIG. 11, from the “vertical posture” and the “clamping posture”, the pillars 12 and 12 are tilted forward, that is, the workpiece W is tilted forward so that the parts can be smoothly assembled to the lower part after the workpiece W. To.
At this time, the placement units 20 and 20 and the arms 40 and 40 are tilted forward together with the workpiece W. On the other hand, the pendulums 50 and 50 hold the vertical posture without tilting. That is, the pendulums 50 and 50 rotate forward with their own weights around the second pendulum pins 54 and 54 with respect to the support columns 12 and 12, and maintain the vertical posture. Thereby, a part of end surface 52b * 52b * 52b * 52b of side part 52 * 52 * 52 * 52 in both right and left clamp mechanisms 4 * 4 will be in the posture which counters columns 12 * 12, respectively.
Here, when the workpiece W is tilted forward, the workpiece W is rotated around the portion sandwiched between the clamp portion 42 and the placement portion 20 and further tilted forward. As a result, from the clamp mechanisms 4 and 4. It may fall out and try to fall forward. At this time, the work W is about to rotate, so that the arms 40 and 40 (clamp portions 42 and 42) are pushed upward, and a force is applied to the clamp portions 42 and 42 so as to push upward. 42 and 42 rotate upward, and the mounting portions 20 and 20 try to slide upward. Further, the mounting portions 20 and 20 slide upward due to the elastic force of the coil springs 30 and 30, and the clamp portions 42 and 42 try to rotate upward. For this reason, in order to prevent the workpiece W from falling off the clamp mechanisms 4 and 4 and maintain the “clamping posture”, it is necessary to restrict the upward rotation of the clamp portions 42 and 42. That is, it is necessary to restrict the upward sliding of the left mounting parts 20 and 20.
When the work W applies a force in a direction to push upward with respect to the clamp portions 42 and 42, and when this force becomes a predetermined value or more, the clamp portions 42 and 42 rotate upward about the fixing pins 45 and 45, and are placed. The parts 20 and 20 slide upward. Then, as the clamp portions 42 and 42 are rotated upward (sliding upward of the placement portions 20 and 20), the pendulums 50 and 50 are brought close to the support columns 12 and 12 while maintaining the vertical posture.・ Contact 12 At this time, as described above, a part of the end faces 52b, 52b,... Of the side portions 52, 52,. A part of the end faces 52b, 52b,... Of the side portions 52, 52,. When the end faces 52b, 52b, etc. abut against the support posts 12, 12, respectively, the side parts 52, 52, ... are held by the support posts 12, 12, so that the clamp parts 42, 42 are centered on the fixing pins 45, 45. Therefore, the upward rotation of the clamp parts 42 and 42 is restricted, and the upward sliding of the mounting parts 20 and 20 is restricted. That is, the side portions 52, 52,... Act as stoppers that restrict upward sliding of the placement portions 20, 20. As a result, the “clamping posture” is maintained, and the workpiece W is prevented from falling off the clamping mechanisms 4 and 4 and falling down.

From the “vertical posture” and the “clamping posture”, the columns 12 and 12 are tilted rearward, that is, the workpiece W is tilted rearward so that the parts can be smoothly assembled to the lower part in front of the workpiece W.
At this time, the placement units 20 and 20 and the arms 40 and 40 are tilted backward together with the workpiece W. On the other hand, the pendulums 50 and 50 do not tilt but rotate backward with their own weights around the second pendulum pins 53 and 53 with respect to the support columns 12 and 12 to maintain the vertical posture. Thereby, a part of end surface 52b * 52b * 52b * 52b of side part 52 * 52 * 52 * 52 in both right and left clamp mechanisms 4 * 4 will be in the posture which counters columns 12 * 12, respectively.
Here, when the workpiece W is tilted backward, the workpiece W is rotated around the portion sandwiched between the clamp portion 42 and the mounting portion 20 to further tilt backward, and as a result, from the clamp mechanisms 4 and 4. It may fall out and try to fall backwards. At this time, the end faces 52b, 52b, ... are in contact with the columns 12, 12, respectively, and the side portions 52, 52, ... are respectively held by the columns 12, 12, and the upward rotation of the clamp portions 42, 42 is restricted. . That is, the upward sliding of the placement units 20 and 20 is restricted. As a result, the “clamping posture” is maintained, and the workpiece W is prevented from falling off the clamping mechanisms 4 and 4 and falling down.

  By configuring as described above, the workpiece W is clamped only by placing the workpiece W on the placing portion 20, and the workpiece W is clamped by the pendulum 50 coming into contact with the support column 12 when the workpiece W is tilted. State is maintained. Therefore, it is not necessary to provide a drive mechanism for clamping the workpiece W (a cylinder portion including a piston that is displaced under the action of pressure fluid, a toggle clamp mechanism, etc.), and the manufacturing cost of the apparatus can be reduced. Further, when the workpiece W is clamped, work such as operating the drive mechanism is not necessary, the work time can be reduced, and the work W can be efficiently clamped to improve the work efficiency. . Furthermore, problems such as forgetting the clamping work do not occur.

  Moreover, in order to clamp the workpiece | work W, the workpiece | work W should just be mounted in the mounting part 20, and it is not necessary to use an attachment etc. Therefore, work related to the attachment (attachment work to the work W, attachment collection work, attachment transport work, etc.) can be eliminated, and the work W can be efficiently clamped.

  In addition, when assembling parts to the lower part of the work W, the work W can be appropriately tilted forward, backward, left and right, so that the approachability to the lower part of the work W is improved and the worker works in a posture where his / her waist is bent. This can be suppressed and the burden on the operator can be reduced, which is also preferable in terms of ergonomics.

As shown in FIG. 13, four clamping mechanisms 4 are prepared, and the clamping mechanisms 4, 4... Are arranged at the four front, rear, left and right corners of the base 3 so that the workpieces W are supported by the four clamping mechanisms 4. It may be configured.
With this configuration, when the workpiece W is tilted to the right, the clamp portions 42 and 42 and the placement portions 20 and 20 in the right front and right rear clamp mechanisms 4 and 4 are sandwiched, respectively. It may turn around the part and tilt further to the right. At this time, the cam portion 51 in the left front clamp mechanism 4 is in contact with the support column 12, and the cam portion 51 in the left rear clamp mechanism 4 is in contact with the support column 12 so that the workpiece W is clamped. Is done. Further, when the workpiece W is tilted to the left, the cam portion 51 in the right front side clamp mechanism 4 abuts on the support column 12, and further, the cam portion 51 in the right rear side clamp mechanism 4 abuts on the support column 12. The clamped state of W is maintained.
Further, when the workpiece W is tilted forward, the workpiece W rotates about the portion sandwiched between the clamp portions 42 and 42 and the placement portions 20 and 20 in the left front and right front clamp mechanisms 4 and 4. It may try to lean further forward. At this time, the side portions 52 and 52 in the clamp mechanism 4 on the left rear side abut on the support column 12, and the workpieces W are clamped by the contact of the side portions 52 and 52 in the clamp mechanism 4 on the right rear side with the support column 12. Is maintained. Further, when the workpiece W is tilted rearward, the side portions 52 and 52 in the left front clamp mechanism 4 abut on the support column 12, and the side portions 52 and 52 in the right front clamp mechanism 4 abut on the support column 12. Thus, the clamped state of the workpiece W is maintained.
By using the four clamping mechanisms 4 in this way, the state in which the workpiece W is clamped can be more reliably held when the workpiece W is tilted.

Note that the clamp mechanism 5 may be used in place of the clamp mechanism 4, and the workpiece may be clamped by the clamp mechanism 5.
Below, the clamp mechanism 5 which is another embodiment of the clamp mechanism 4 is demonstrated.

  As shown in FIG. 14, the clamp mechanism 5 includes a support portion 60, a placement portion 70, a coil spring 80, an arm 90, a thread member 100, a weight 110, and a storage member 120.

The support portion 60 is a support member that supports the placement portion 70, the coil spring 80, and the arm 90.
The support part 60 has a rotation shaft part 61.
One end side of the rotation shaft portion 61 is fitted into the support column 12 through a hole formed in the upper end surface of the support column 12, and the other end side protrudes upward from the upper end of the support column 12. Supported as possible. In addition, a groove 62 formed in a spiral shape around the axis is provided in the middle portion of the outer peripheral surface of the rotation shaft portion 61.

The placement unit 70 is a support member that supports the workpiece W from below, and has a shape that extends substantially parallel to the base 3. A through hole 70 a penetrating in the vertical direction is formed in the left and right midway portion of the mounting portion 70. A rotation shaft portion 61 is inserted into the through hole 70 a, and the placement portion 70 is supported so as to be slidable in the vertical direction along the rotation shaft portion 61. The opening area of the through hole 70a is set smaller than the area of the upper end surface of the support column 12. For this reason, the placement unit 70 slides upward from the support column 12. That is, the lowest point of the placement unit 70 is set as the upper end of the support column 12.
The mounting portion 70 is connected to the support column 12 by a plate fixing pin 71, and the plate fixing pin 71 restricts the mounting portion 70 from rotating around the rotation shaft portion 61. Specifically, a mounting portion hole is formed in the lower end surface of the mounting portion 70, and a column hole is formed at a position facing the mounting portion hole in the upper end surface of the column 12. One end portion of the plate fixing pin 71 is inserted into the mounting portion hole, and the other end portion of the plate fixing pin 71 is inserted into the support hole. The plate fixing pin 71 is slidably inserted into at least one of the placement hole and the support hole.
In the present embodiment, the plate fixing pin 71 is provided on the left side of the rotating shaft portion 61. For example, the plate fixing pin 71 is disposed forward and backward (the front side and the back side in FIG. 14) with the rotating shaft portion 61 interposed therebetween. One of each may be provided.
The placement portion 70 is connected to the rotation shaft portion 61 and the placement portion connection pin 72. Specifically, the placement portion connection pin 72 is fixed to the placement portion 70, and the tip of the placement portion connection pin 72 protrudes inward through the through hole 70 a of the placement portion 70 to form a groove in the rotation shaft portion 61. 62 is engaged.

The coil spring 80 is wound around the rotating shaft portion 61 in an annular shape, and is interposed between the placing portion 70 and the support column 12.
The coil spring 80 is a spring member having a predetermined spring coefficient, and generates a biasing force from the support column 12 toward the mounting portion 70 by being compressed, or a function of biasing the mounting portion 70 upward, or described later. As described above, the arm 90 is biased in the rotation direction.

The arm 90 is a clamp member that clamps the workpiece W with the arm 90 and the mounting portion 70 interposed therebetween.
The arm 90 has a shape extending substantially parallel to the base 3 and is fixed to the upper end portion of the rotation shaft portion 61 at the base end portion. A clamp part 91 protruding downward (base 3) is formed at the tip of the arm 90, and the workpiece W is sandwiched between the clamp part 91 and the mounting part 70 and clamped. It is configured.

As shown in FIGS. 15A and 15B, when the work W is placed on the placement portion 70, the coil spring 80 contracts due to the weight of the work W, and the placement portion 70 slides downward. The placement portion connection pin 72 slides in the groove 62 (slids downward in the groove 62). Thereby, turning force is applied to the rotation shaft portion 61, and the rotation shaft portion 61 (the clamp portion 91 of the arm 90) rotates about the axis. The rotation direction of the clamp part 91 at this time is defined as a first direction. And as shown in FIG.15 (c), the clamp part 91 rotates above the mounting part 70 (specifically, the upper part of the part mounted in the mounting part 70 in the workpiece | work W) (mounting). The workpiece W is clamped between the mounting portion 70 and the mounting portion 70. In the present embodiment, when the clamp portion 91 is rotated in the first direction from the position shown in FIG. 15A to the position shown in FIG.
When the workpiece W is clamped and a force is applied to the workpiece W in an upward direction to lift the workpiece W, the coil spring 80 expands due to the elastic force, and the placement portion 70 slides upward. The connection pin 72 slides upward in the groove 62. Thereby, rotational force is given to the rotation shaft part 61, and the clamp part 91 rotates in the second direction that is opposite to the first direction. As a result, the clamp portion 91 is retracted from above the placement portion 70 (separated from the placement portion 70). As a result, the clamp state of the workpiece W is released, and the workpiece W can be lifted smoothly without being brought into contact with the clamp portion 91.

  As shown in FIG. 14, the thread-like member 100 connects the placement unit 70 and the weight 110, one end is fixed to the placement unit 70, and the other end is fixed to the weight 110.

The weight 110 is connected to the placement unit 70 via the thread member 100 and moves up and down together with the placement unit 70. The weight 110 is swingably connected to the placement unit 70 by the thread-like member 100, and is suspended from the placement unit 70 in a natural posture (with its own weight).
The weight 110 has a cylindrical shape and is accommodated in the accommodating member 120.

The housing member 120 is fixed to the base 3 and tilts together with the base 3.
The accommodating member 120 has a hollow container shape that can accommodate the weight 110 and has a passage 121 and a space 122 therein. The passage 121 is a space extending in the vertical direction, and has a diameter slightly larger than the diameter of the weight 110, and the weight 110 is configured to be slidable along the wall surface of the passage 121. The space 122 is continuous with the lower portion of the passage 121 and has a diameter larger than that of the passage 121, whereby a stepped portion 123 is formed at a portion where the passage 121 and the space 122 are continuous.

As shown in FIGS. 15A and 15B, when the work W is placed on the placement portion 70, the placement portion 70 slides downward and the clamp portion 91 rotates in the first direction. . At this time, the weight 110 slides downward as the mounting portion 70 slides downward, and moves from the passage 121 of the housing member 120 toward the space 122. And as shown in FIG.15 (c), when the workpiece | work W will be in the clamped state, the weight 110 will be located in the space 122 (slightly below the step part 123) (refer Fig.16 (a)).
When the clamp state of the workpiece W is released, the mounting portion 70 slides upward and the clamp portion 91 rotates in the second direction. At this time, the weight 110 moves upward as the mounting portion 70 slides upward, and moves from the space 122 into the passage 121 (see FIG. 16B). That is, when the workpiece W is released from the clamped state, the weight 110 is positioned in the passage 121.

In addition, when the workpiece W is shaken or vibrated while the workpiece W is clamped, the shake / vibration of the workpiece W is transmitted to the weight 110 in the space 122 via the placement unit 70 and the thread-like member 100. The weight 110 may swing (see FIG. 17A). At this time, the mounting portion 70 may slide upward by the biasing force of the coil spring 80, and the clamp portion 91 may rotate in the second direction to release the clamped state.
At this time, the weight 110 also moves upward as the mounting portion 70 slides upward. However, since the weight 110 is oscillating as described above, the step portion 123 is moved from the space 122 to the passage 121. It comes into contact with and tilts and is held at the lower end entrance of the passage 121. Thereby, the weight 110 does not move into the passage 121 (see FIG. 17B), the upward sliding of the mounting portion 70 is restricted, and the clamp portion 91 is prevented from rotating in the second direction, The clamped state of the workpiece W is maintained. Therefore, even if the workpiece W on the placement unit 70 shakes or vibrates, the clamped state of the workpiece W can be maintained. When the vibration and vibration of the workpiece W are settled (when the weight 110 is stationary), the weight 110 can move smoothly into the passage 121 without being held by the lower end inlet of the passage 121, and the clamp state of the workpiece W is released. it can.

  Further, when the base 3 (accommodating member 120) is tilted while the workpiece W is clamped, the weight 110 swings in the same direction as the inclination direction of the accommodating member 120 with its own weight with respect to the accommodating member 120. Hold the previous posture without tilting. Thereby, the upper end part of the weight 110 is facing the step part 123, and becomes the attitude | position substantially contact | abutted to the step part 123 (refer Fig.18 (a)). At this time, the mounting portion 70 may slide upward by the biasing force of the coil spring 80, and the clamp portion 91 may rotate in the second direction to release the clamped state. At this time, the weight 110 also moves upward as the mounting portion 70 slides upward. However, since the upper end portion of the weight 110 faces the step portion 123 as described above, the weight 110 abuts on the step portion 123. And is held at the lower end entrance of the passage 121. Thereby, the weight 110 does not move into the passage 121 (see FIG. 18B), the upward sliding of the mounting portion 70 is restricted, and the clamp portion 91 is prevented from rotating in the second direction, The clamped state of the workpiece W is maintained. Therefore, even if the clamp mechanism 5 is tilted, the clamped state of the workpiece W can be maintained.

  As described above, even if the clamp mechanism 5 is used, the workpiece W can be clamped without providing a drive mechanism (a cylinder portion including a piston that is displaced under the action of pressure fluid, a toggle clamp mechanism, etc.). is there.

DESCRIPTION OF SYMBOLS 1 Clamping apparatus 4 * 5 Clamp mechanism 10 Support part 12 Post 20 Placement part 40 Arm 50 Pendulum 51 Cam part 52 Side part 52b End surface 51b Arc part 51c Inclination part 51d Boundary part

Claims (4)

A column supported in a tiltable manner;
A support member on which the workpiece is placed, supported by the support so as to be movable up and down, and a placement portion that moves downward by the weight of the workpiece when the workpiece is placed;
It is rotatably supported by the support column, and when it rotates in the first direction, it comes close to the mounting part, and when it rotates in the second direction opposite to the first direction, it is separated from the mounting part, It is configured to rotate in the first direction along with the downward movement of the mounting unit by being connected to the mounting unit, and to rotate in the second direction along with the upward movement of the mounting unit. The workpiece placed on the placement portion is rotated in the first direction as the workpiece is placed on the placement portion and the placement portion moves downward. An arm to be clamped with
In the state where the workpiece is clamped, when the support column is inclined and the mounting unit is about to move upward, a regulating member that regulates the upward movement of the mounting unit;
A clamping device comprising: The restricting member is rotatably attached to the arm, and is configured to be rotatable in a third direction, which is a direction approaching and separating from the support column. The arm rotates in the first direction. A pendulum that moves away from the support column and moves closer to the support column as the arm rotates in the second direction.
The pendulum includes an arc portion formed in an arc shape and has a cam portion attached to the arm at a center position of the arc forming the arc portion,
In a state where the work is clamped, when the support column is inclined in the third direction, the pendulum rotates in the third direction with respect to the support column by its own weight, and the arc portion faces the support column. The clamp device according to claim 1, wherein when the mounting portion is about to move upward in this posture, the circular arc portion abuts on the support column to restrict the upward movement of the mounting portion. The pendulum has a side portion fixed to a surface facing the fourth direction which is a direction orthogonal to the third direction in the cam portion, and is configured to be rotatable in the fourth direction.
In a state where the work is clamped, when the support column is inclined in the fourth direction, the pendulum rotates in the fourth direction with respect to the support column by its own weight, and the side portion faces the support column. The clamp device according to claim 2, wherein when the mounting portion is about to move upward in this posture, the side portion abuts on the support column to restrict upward movement of the mounting portion. The regulating member is
A stopper that is swingably connected to the mounting portion and moves up and down together with the mounting portion;
Inclined with the support, accommodates the stopper portion therein, and has a passage in which the stopper portion is slidable, connected to a lower portion of the passage, and in a direction in which the stopper portion slides in the passage. A housing portion including a space in which a cross-sectional area of a vertical surface is larger than a cross-sectional area of the passage, and a step portion that is a portion where the passage and the space are continuous;
With
The stopper portion is in the space of the housing portion when the workpiece is clamped,
In a state where the work is clamped, when the support column is inclined, the stopper portion swings with respect to the housing portion by its own weight, and the stopper portion is opposed to the stepped portion. When the placement portion tries to move upward, the stopper portion comes into contact with the stepped portion, so that the movement of the stopper portion from the space into the passage is restricted, and the upward movement of the placement portion is restricted. The clamping device according to claim 1.

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