JP6060042B2 - Multiple workpiece clamping structure - Google Patents

Description

  The present invention relates to a clamp structure for a plurality of workpieces, and in particular, while a plurality of clamp devices are arranged in a row, at least one workpiece arranged on each side thereof is simultaneously pressed by the operation of the plurality of clamp devices. Thus, the present invention relates to a clamp structure in which each is fixed.

  Conventionally, various vises, clamping devices, and the like have been used to fix or hold a workpiece on a base of a machine tool. As one of such clamping devices, for example, in Patent Document 1, two clamp halves (clamp member split bodies) are elastically connected by a rubber elastic body, and the two connected Clamping device in which a taper fitting mechanism is provided between the through hole provided in the center of the clamp half and the head of a screw member having a countersunk screw shape inserted through the through hole is clearly shown. Has been. In this clamp device, the screw member is inserted into the through hole and screwed into the base, so that the clamp member is expanded, and the clamp member and the clamp member are predetermined by the pressing force acting on the side thereof. The workpiece disposed between the supporting member and the supporting member can be clamped. Further, in Patent Document 2 and the like, a clamping device that clamps a target workpiece using a cylinder device that is operated by a fluid such as oil or air is disclosed.

  By the way, when such a conventional clamping device is used to place a plurality of workpieces on one base and clamp them respectively, basically, for one workpiece One clamping device is required. Here, in the case where the clamping device as disclosed in Patent Document 1 described above is used, it is necessary to perform the tightening operation of the screw member a plurality of times (the number of workpieces). There is a problem that it takes time to increase the number of work steps. Further, in the case of using a clamp device that is driven by a cylinder device as disclosed in Patent Document 2, etc., the cylinder device can be clamped only once by a control mechanism for each clamp device. Due to the presence of the clamp device, the clamping device itself is relatively large, which occupies a large area and reduces the work installation space. Furthermore, since such a clamping device itself is expensive, there is a problem that the cost of the entire clamping system increases. In addition, since the structure of each cylinder device is complicated, troubles such as leakage of working fluid may occur, and the risk increases with the number of cylinder devices used. These problems become more prominent when many relatively small workpieces are used.

JP 2006-142389 A JP 2006-118690 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that a plurality of clamping devices are arranged in a row, and at least one of them is arranged on both sides thereof. Another object of the present invention is to provide a compact and low-cost multi-work clamp structure that can simultaneously press and fix the work.

  In the present invention, in order to solve such problems, a plurality of clamping devices are arranged in a row, and at least one workpiece is arranged on each side of the row of the clamping devices, and the plurality of the clamping devices are arranged. By operating at least one clamp device, the clamp device is configured to clamp and fix at least one workpiece arranged on both sides, and the clamp device is against the end protruding from the clamp body. The input pin is movable in the axial direction to which the pressing force is applied, and is coaxially and movably disposed in a direction perpendicular to the axial direction of the input pin, and one end of the input pin is lateral to the clamp body. Two clamps each formed with an inclined surface inclined in opposite directions with respect to the axis of the input pin at the other end opposite to each other And pressing surfaces that are inclined corresponding to the inclined surfaces of the end portions of the two clamp pins are provided at both ends, respectively, and the inclined surfaces and the pressing surface are arranged so as to contact each other. A structure in which a wedge pin separated from the input pin is accommodated in the clamp body, and the wedge pin is protruded laterally by pressing the two clamp pins away from each other by axial movement; and A plurality of the clamp devices are arranged such that the input pins of the front side clamp device are pressed by the rear side clamp device in the direction of the pressing force of the input pins. By applying a pressing force to the input pins of the device located at the end in the direction of the pressing force of the device, the pressing force is applied to the input pins of the plurality of clamping devices. A pressing force is sequentially applied from the clamping devices on the rear side in the direction so that the two clamp pins of the respective clamping devices protrude to the sides, and contact with at least one work disposed on both sides of the row of the clamping devices. The basic structure is a multi-work clamping structure characterized by being able to contact and press.

  According to one of the desirable embodiments of the clamp structure for a plurality of workpieces according to the present invention, with respect to the input pin of the clamp device located at the end of the pressing force acting direction in the row of the plurality of clamp devices. A pressing device that is driven by fluid pressure and that applies a predetermined pressing force is provided.

  Further, in the present invention, preferably, the two clamp pins in the clamp device are respectively provided with recesses extending in the axial direction thereof, whereas the respective recesses of the clamp pins are provided. The tip of the stop pin fixed to the clamp body is inserted and positioned so that the axial movement distance and the rotation around the axis of the two clamp pins are restricted.

  Further, according to the present invention, an extension bar having a predetermined length is attached to the input pin of the clamp device, and the distal end portion of the extension bar comes into contact with the clamp device on the rear side in the pressing force acting direction. It is desirable to be configured to obtain.

  In addition, according to one of the advantageous aspects of the multiple workpiece clamping structure according to the present invention, the clamping device located in the forefront of the pressing force acting direction in the row of the plurality of clamping devices is held in a fixed position. It is configured to be able to.

  Further, according to another preferred embodiment of the clamp structure for a plurality of workpieces according to the present invention, a clamp device excluding the one located at the forefront of the pressing force acting direction among the plurality of clamp devices, A guide member for guiding in the arrangement direction is provided.

  Further, in the clamp structure for a plurality of workpieces according to the present invention, an urging means for urging the two clamp pins projected by the wedge pins so as to retreat to their original positions is provided in the clamp body. It is desirable that it is disposed.

  In this way, in the multiple workpiece clamping structure according to the present invention, the input pin movable in the axial direction in which the pressing force is applied to the end protruding from the clamp body, and the axial direction of the input pin. A plurality of clamp members, which are arranged coaxially and movably in a direction perpendicular to each other and have one end projecting to the side of the clamp body. The input pins of the clamp device on the front side in the direction are arranged in a row so that the input pins are pressed by the clamp device on the rear side, and the input pin of the one located at the end of the plurality of clamp devices arranged is pressed , By applying a pressing force sequentially from the rear clamping device to the input pins of the plurality of clamping devices, Each clamp pin protrudes to the side and abuts against at least one workpiece arranged on both sides of the row of clamp devices so that it can be pressed. Multiple clamping devices can be activated simultaneously by a single operation of applying a pressing force to the input pins of the clamping device, thereby clamping workpieces on both sides of the row of clamping devices simultaneously. It will be. Therefore, the working time is effectively shortened, and the man-hours related to clamping a plurality of workpieces can be advantageously reduced.

  Moreover, in the clamping device used in the multiple workpiece clamping structure according to the present invention, one end of each of the two clamp pins protrudes outward from both sides of the clamp body, and the other opposite end thereof. Are formed with inclined surfaces inclined in opposite directions with respect to the axis of the input pin, and a pressing surface inclined corresponding to the inclined surfaces of the ends of the two clamp pins is provided. Provided at both ends, respectively, so that the inclined surface and the pressing surface are in contact with each other, the two pin pins are pressed in a direction away from each other by the axial movement of the input pin and protruded to the side, A wedge pin separate from the input pin has a structure accommodated in the clamp body. Therefore, when pressing and fixing at least one workpiece arranged on both sides of a row of clamping devices, in other words, a total of two or more workpieces at the same time, the clamping device depends on the size of the workpiece and its manufacturing error. Even if there is a difference in the distance between the (clamp pin) and each workpiece, the pressing force from the input pin can be effectively applied to the two clamp pins. It is possible to advantageously avoid problems such as variations in the clamping force acting on each workpiece, resulting in insufficient clamping force on one of the workpieces, and securely clamping the workpieces on both sides It will exhibit the characteristics that can be.

  Further, in the multiple workpiece clamping structure according to the present invention, the clamping device used there operates two clamping pins with a mechanical structure that does not require working fluid such as oil or air. There is an advantage that troubles such as leakage of working fluid can be avoided, and the structure of the clamp device is effectively simplified, and a special control mechanism for operating them is unnecessary. As a result, the clamping structure has the advantage that it is advantageously compacted as a whole and is low in cost.

It is an isometric view explanatory drawing which shows an example of the clamp apparatus used in the clamp structure of the several workpiece | work according to this invention. It is AA cross-section explanatory drawing in FIG. It is BB sectional explanatory drawing in FIG. It is CC sectional explanatory drawing in FIG. 3, Comprising: The form of the long hole provided in the clamp pin is shown. FIG. 2 is a perspective explanatory view showing a clamp pin used in the clamp device shown in FIG. 1, wherein (a) and (b) are views from different angles. It is a perspective explanatory view which shows the wedge pin used in the clamp apparatus shown by FIG. FIG. 4 is an explanatory view showing a state in which the clamp pin is at a maximum projecting position in the cross-sectional form of FIG. 3. It is plane explanatory drawing which shows an example of the structure according to this invention formed by clamping a some workpiece | work using two or more of the clamp apparatuses shown by FIG. It is DD sectional explanatory drawing in FIG. It is EE sectional explanatory drawing in FIG. In the multiple workpiece clamping structure shown in FIG. 8, FIG. 9 is a partial plan view for sequentially illustrating the process of clamping the workpiece, where (a) shows the state before the pressing force is applied, and (b) The state immediately after the pressing force is applied is shown together with the movement direction of each member, and (c) shows the state in which the clamping device is clamping the workpiece together with the pressing force that is applied to each member. FIG. 4 is a cross-sectional explanatory view corresponding to FIG. 3 sequentially illustrating the operation state of the clamp device when the distance between the clamp pin and the workpieces on both sides is different, where (a) is the original position, and (b) is one side. (C) shows a state in which the other clamp pin is in contact with the workpiece. It is plane explanatory drawing which shows another example of the clamp structure of the several workpiece | work according to this invention. It is FF cross section explanatory drawing in FIG. FIG. 14 is a cross-sectional explanatory view corresponding to FIG. 3, illustrating a clamp device in which a clamp pin protrudes only on one side, which is used in the multiple workpiece clamp structure illustrated in FIG. It is a section explanatory view corresponding to Drawing 2 showing other examples of the clamp structure of a plurality of works according to the present invention.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an example of a clamping device used in a multiple workpiece clamping structure according to the present invention. As is apparent from FIG. 1, the clamp device 10 has a rectangular block-shaped clamp body 12, and two clamp pins 14 and 14 and an input pin 16 are projected from the clamp body 12, respectively. In addition, two circular guide bar insertion holes 18 and 18 are provided so as to penetrate the clamp body 12.

  Here, if the structure of the clamp device 10 is specifically described, the clamp body 12 has an opening at the rear side (right side in FIG. 2) of the clamp device 10 as shown in FIG. An input pin insertion hole 20 having a circular cross section is provided, and a thick cylindrical input pin 16 having an outer diameter substantially the same as or slightly smaller than the inner diameter of the input pin insertion hole 20 is provided therein. One end is protruded from the clamp body 12 by a predetermined length, and is inserted so as to be movable in the axial direction (direction of pressing force: left and right in FIG. 2). The input pin 16 has a female thread portion 22 formed on the entire inner peripheral surface thereof, and a recess 24 having a predetermined width is formed over the entire periphery in the axial center portion of the outer peripheral surface. The distal end portion of the stop pin 26 screwed into the upper portion of the main body 12 enters the recess 24 and is positioned, so that the movement distance in the axial direction is restricted. The stop pin 26 is fixed in a so-called double nut form by screwing another nut thereon. Further, two chamfered portions 28 and 28 are formed at one end portion of the input pin 16 protruding from the clamp body 12, while the other end portion located in the clamp body 12 is described later. It is made to contact | abut to the wedge pin 30 to do.

  As shown in FIG. 3, the clamp body 12 has a circular cross-sectional clamp pin that penetrates the clamp body 12 in the direction perpendicular to the axial direction of the input pin 16 (the left-right direction in FIG. 3). An insertion hole 32 is provided, and two cylindrical clamp pins 14 and 14 having an outer diameter substantially the same as or slightly smaller than the inner diameter of the clamp pin insertion hole 32 are input into the hole. The pins 16 are coaxially and movably arranged in a direction perpendicular to the axial direction of the pin 16, and one end thereof is located on the side of the clamp body 12, in other words, outward from both side surfaces of the clamp body 12. Protruding. Further, in the center of each clamp pin 14, a hole 34 having a circular cross section extending in the axial direction is formed so as to open on the protruding end side from the clamp body 12, and the inner peripheral surface thereof is formed. A female screw portion 36 is formed at a predetermined length from the opening. Further, two chamfered portions 37, 37 are formed on the outer peripheral surface of the end portion of each clamp pin 14, 14 protruding from the clamp body 12.

  3 and 4, a long hole 38 that penetrates from the outer peripheral surface to the hole 34 is formed as a recess extending in the axial direction at the axially central portion of the clamp pin 14, and the clamp body 12. The end of the locking pin 40 screwed into the slot is inserted into and positioned in the long hole 38. The width of the long hole 38 is slightly larger than the diameter of the stop pin 40. Thus, the axial movement distance of the clamp pin 14 is restricted by the axial length of the long hole 38, and the rotation of the clamp pin 14 around the axis is also restricted. Further, the stop pin 40 is fixed in a so-called double nut form by screwing another nut on the upper side thereof. Further, a compression coil spring 42 is disposed between the set pin 40 and the bottom surface 34 a of the hole 34, and the two clamp pins 14, 14 are respectively urged toward the inside of the clamp body 12. ing.

  Further, as shown in FIG. 3, one end of the two clamp pins 14 and 14 that are not opposed to each other is protruded to the side of the clamp body 12, while the other opposite end is Inclined surfaces 44, 44 that are inclined in opposite directions with respect to the axis of the input pin 16 are formed. Here, both of these inclined surfaces 44 and 44 are formed at an angle of 45 ° with respect to the axis of the clamp pin 14. FIG. 5 shows such a clamp pin 14 in the form of a single perspective view.

  In addition, in the clamp pin insertion hole 32 provided in the clamp body 12, a cylindrical shape having a smaller diameter than the inner diameter of the clamp pin insertion hole 32 is present between the two clamp pins 14 and 14, and both end portions in the axial direction. In addition, the wedge pin 30 provided with the pressing surfaces 46 and 46 that are inclined corresponding to the inclined surfaces 44 and 44 of the clamp pins 14 and 14 is in surface contact between the pressing surfaces 46 and 46 and the inclined surfaces 44 and 44. Are arranged and housed. Further, such a wedge pin 30 is configured separately from the input pin 16 and is movable in the axial direction of the input pin 16, and a direction perpendicular to the axial direction (the axial direction of the clamp pin 14). ), Relative movement with respect to the input pin 16 is possible. FIG. 6 shows such a wedge pin 30 in the form of a single perspective view.

  And this clamp apparatus 10 operate | moves as follows. That is, in FIG. 3 showing the clamp device 10 in a state where no pressing force is applied to the input pin 16, the clamp pin 14 is retracted inward of the clamp body 12 by the biasing force of the compression coil spring 42. It has been moved so that. Further, along with the movement of the clamp pin 14, the wedge pin 30 is moved rearward (downward in FIG. 3) in the pressing force acting direction, and further, along with the movement of the wedge pin 30, The input pin 16 is moved backward in the pressing force acting direction. In addition, let the position of each member in this state be an original position.

On the other hand, in FIG. 7, as indicated by the white arrow in the drawing, the pressing force is applied to the input pin 16, and the clamping device 10 is in the state of being moved to the maximum in the axial direction. It is shown. At this time, the wedge pin 30 is moved in the radial direction in the clamp pin insertion hole 32 by the axial movement of the input pin 16. At this time, the pressing surface 46 of the wedge pin 30 and the inclined surface 44 of the clamp pin 14 are moved. Since they are in contact with each other, the two clamp pins 14 and 14 are pressed away from each other, so that the clamp pins 14 and 14 are clamped to the clamp body 12 as indicated by the thick arrows in the figure. It will be able to be moved in the direction of projecting to the side of each. In this state, the clamp pins 14 and 14 are in the maximum projecting position. Here, since the inclined surface 44 and the pressing surface 46 are inclined at 45 ° with respect to the axial direction of the input pin 16, the original position of the clamp pin 14 (see the two-dot chain line in the figure). The protrusion distance from the distance: d _CMAX and the movement distance from the original position of the input pin 16: d _IMAX are equal to each other. Then, the target workpiece is pressed and fixed by the clamp pin 14 thus projected.

  Here, FIG. 8 shows, in the form of a plan view, an example of a multiple workpiece clamping structure according to the present invention, which is configured by using a plurality of clamping devices 10 having the above-described structure. In such a clamp structure, a plurality of (here, five) clamp devices 10 are arranged in a row on a base 50 composed of a long rectangular flat table, and are arranged on both sides of the row, respectively. A plurality of (here, five) workpieces 52 are configured to be pressed and fixed by the operation of the clamp device 10. Here, the auxiliary pin member 54 is screwed to the tip of the clamp pin 14 described above and is integrally connected.

  Specifically, as shown in FIGS. 8 and 9, the workpiece 52 is housed in the housing recess 60 of the workpiece holding block 58 fixed on the base 50, and the clamping device 10. The tip of the clamp pin 14 (auxiliary pin member 54) protruding from the clamp main body 12 is brought into contact with and pressed and fixed. Further, the end of the input pin 16 protrudes from the clamp body 12, except for the clamp device 10 positioned at the top of FIG. 8 in the arrangement direction of the plurality of clamp devices 10 (vertical direction in FIG. 8). Thus, the tip of the extension bar 62 screwed and connected to the tip of the input pin 16 is brought into contact with the clamping device 10 (clamp body 12) adjacent to the rear side (downward in FIG. 8) in the pressing force direction. It is supposed to be.

  Here, a pressing device 64 is fixedly disposed on the base 50 below the lowermost clamping device 10 in the arrangement direction shown in FIG. As the pressing device 64, a known hydraulic cylinder, air cylinder, or the like is appropriately selected and used. The pressing device 64 is connected to a controller (not shown) so that the operation thereof is controlled. And the front-end | tip of the press rod 66 extended from such a press apparatus 64 contact | abuts to the input pin 16 of the lowermost clamp apparatus 10, and pressing force is an axial direction of this input pin 16, from the downward direction in FIG. It is designed to act upward. Further, a stopper block 68 is disposed on the base 50 in a fixed position in front of the clamping device 10 that is positioned at the forefront in the direction of the pressing force, and a stopper pin that is screwed into the stopper block 68. The tip of 70 is brought into contact with the foremost clamp device 10 so that the forward movement of such a clamp device 10 is restricted.

  Further, in this clamp structure, two round bar-shaped guide bars 72 are arranged as guide members for guiding the plurality of clamp devices 10 in the arrangement direction. The guide bars 72, 72 pass through a plurality of (here, five) clamp devices 10 and extend in the arrangement direction of the clamp devices 10 (pressing force acting direction), and their front ends are fixed to the stopper block 68. The rear ends are fixed to the pressing device 64, respectively.

  As shown in FIG. 10, the extension bar 62 is formed by screwing a female screw portion 22 formed on the entire inner peripheral surface of the input pin 16 and a male screw portion 74 protruding from the extension bar 62. And connected to the tip of the input pin 16. Further, the auxiliary pin member 54 is also screwed into a female screw portion 36 formed on the inner peripheral surface of the clamp pin 14 and a male screw portion 76 protruding from the auxiliary pin member 54, so that the distal end of the clamp pin 14. Are integrally connected to each other. Here, two chamfered portions 78, 78 and 80, 80 are formed at the end portion of the extension bar 62 facing the input pin 16 and the end portion of the auxiliary pin member 54 facing the clamp pin 14, respectively. As described above, the chamfered portions 28 and 37 formed on the input pin 16 and the clamp pin 14 are combined with each other by a screwing operation by sandwiching them with a tool or the like. Can be done.

  11 (a), 11 (b), and 11 (c), the configuration related to the three clamping devices 10, 10, 10 from the front in the pressing force acting direction (upward in FIG. 11) in the clamp structure described above. Is partially shown. In FIG. 11, for the sake of convenience, the configuration relating to the foremost clamping device 10 (a) in the pressing force acting direction is indicated by adding “a” to the end of the reference numeral, and thereafter sequentially rearward. About the structure which concerns on the clamp apparatus 10 (b) and 10 (c), it shall show by attaching | subjecting "b" and "c" in order.

First, in FIG. 11, (a) shows a state before the pressing force is applied, and the input pins 16a, 16b, 16c and the clamp pins 14a, 14b, 14c are in their original positions. The distances between the pins 14a, 14b, 14c (auxiliary pin members 54a, 54b, 54c) and the workpieces 52a, 52b, 52c are d _C , respectively.

  Next, FIG. 11B shows a state immediately after the pressing force is applied. Then, first, when a pressing force is applied to the input pin 16c of the clamping device 10c located at the rearmost direction of the pressing force in the drawing by a pressing device (64) (not shown), the clamping of the clamping device 10c is performed. The pin 14c is projected and moved to the side of the clamp body 12c, that is, toward the workpiece 52c (see a thick arrow Cc in the drawing). At the same time, the clamping device 10c itself is moved forward (see the thick arrow Bc in the figure), and a pressing force is applied to the input pin 16b of the clamping device 10b adjacent to the front side. Thereby, in the clamp apparatus 10b, the clamp pin 14b is protruded and moved toward the workpiece 52b, similarly to the clamp apparatus 10c. At the same time, the clamp device 10b itself is moved forward, and a pressing force is applied to the input pin 16a of the clamp device 10a adjacent to the front side. Similarly, in the clamp device 10a, the clamp pin 14a is projected and moved toward the workpiece 52a. In the foremost clamping device 10a, the movement of the clamping device 10a itself is regulated by the stopper pin 70, and a pressing force acts on each clamping device 10a, 10b, 10c by this reaction force. It is supposed to be squeezed. The clamp devices 10c and 10b are guided by guide bars 72 and 72 as guide members so as to be movable in the arrangement direction.

  Subsequently, FIG. 11C shows a state in which the workpieces 52a, 52b, and 52c are clamped by the clamp devices 10a, 10b, and 10c. Here, as indicated by the white arrows in the figure, the input pins 16a, 16b, and 16c of the respective clamp devices 10a, 10b, and 10c are separated from the clamp device 10 adjacent to the rear side in the pressing force acting direction. The pressing forces Fc, Fb, and Fa are sequentially applied to the clamp pins 14a and 14b in contact with the workpieces 52a, 52b, and 52c arranged on both sides of the rows of the clamp devices 10a, 10b, and 10c, respectively. , 14c (auxiliary pin members 54a, 54b, 54c) are pressed in the direction projecting to the side of the clamp bodies 12a, 12b, 12c, and the workpieces 52a, 52b, 52c are pressed. And fixed (clamped). It should be noted that the pressing force applied to each of the clamp devices 10a, 10b, and 10c has a relationship that decreases as it goes forward in the pressing force operation direction, that is, a relationship that Fc> Fb> Fa.

In addition, in the clamp structure as described above, the clamp device 10 disposed on the rear side in the pressing force acting direction in the configuration is such that the movement distance of the clamp device 10 disposed on the front side and the movement of the input pin 16 are the same. The total distance is moved forward in the direction of the pressing force. Here, in the present embodiment, as described above, since the inclined surface 44 and the pressing surface 46 are each 45 ° with respect to the axial direction of the input pin 16, The moving distance of the clamp pin 14 is equal. That is, the movement distances d _i a, d _I b, d _I c of the input pins 16a, 16b, 16c of the clamp devices 10a, 10b, 10c are the movement distances (auxiliary pins) of the clamp pins 14a, 14b, 14c, respectively. Distance between the tips of the members 54a, 54b, 54c and the workpieces 52a, 52b, 52c): equal to d _C. Thus, in FIG. 11, the moving distance of the clamping device 10b: d _B b, since the clamping device 10a adjacent to the front side does not move, the moving distance of the input pins 16a: d _I a, i.e., equal to d _C. The moving distance of the clamp device 10c: d _B c is the moving distance of the clamping device 10b that is adjacent to the front side: d _B b and the moving distance of the input pins 16b: the sum of the d _I b, i.e., d _C It is equal to twice. For this reason, when designing the clamp structure, it is necessary to design in consideration of the movement distance of the clamp device 10 itself, in particular, that the distance increases in the backward direction of the pressing force.

  As is clear from the above description, in this embodiment, a plurality of clamps can be obtained by a single operation of applying a pressing force to the input pin 16 of the clamping device 10 located at the rearmost position in the pressing force operating direction. The devices 10 can be actuated simultaneously, whereby the workpieces 52 on both sides of the rows of the clamping devices 10 can be clamped simultaneously. Therefore, the work time is effectively shortened, and the work man-hours related to the clamping of the plurality of workpieces 52 can be advantageously reduced. Further, since the clamp device 10 has a mechanical structure that does not require a working fluid such as oil or air, there is an advantage that troubles such as leakage of the working fluid can be avoided. Furthermore, the structure of the clamping device 10 is effectively simplified, and a special control mechanism for operating them is unnecessary, so that the clamping structure is advantageously compact and low-cost as a whole. It is a thing.

  Further, in this embodiment, an extension bar 62 having a predetermined length is attached to the input pin 16 of the clamp device 10, and the tip portion thereof contacts the clamp device 10 adjacent to the rear side in the pressing force acting direction. It is comprised so that it may touch. For this reason, by appropriately setting the length of the extension bar 62, it is possible to advantageously cope with the difference in the size of the workpiece 52 and the interval between the clamp positions, and it is possible to effectively exert the pressing force, This makes it possible to flexibly cope with changes in the design of the clamp structure.

  Furthermore, a guide bar 72 as a guide member is provided for guiding the clamping device 10 excluding the one located among the plurality of clamping devices 10 at the forefront of the pressing force acting direction in the arrangement direction. Since each clamp device 10 can be advantageously guided and moved in the arrangement direction (pressing force acting direction), the pressing force can be effectively applied to the input pin 16 of the rear clamping device 10. It is possible.

  Then, compression coil springs 42 and 42 as urging means for urging the two clamp pins 14 and 14 projected by the wedge pin 30 so as to retreat to the original position are disposed in the clamp body 12. Thus, when the pressing force on the input pin 16 is released, each member is quickly returned to the original position. For this reason, problems such as interference between the workpiece 52 and the crank pin 14 can be effectively avoided when the workpiece 52 is replaced. This is a great advantage particularly when the clamping structure is automated as a whole. It becomes.

In such a clamp structure, the distance between the tip of the clamp pin 14 and the workpiece 52 may be different on both sides of the clamp device 10 due to manufacturing errors or the like. FIG. 12A shows a state in which each member is in the original position with respect to one clamping device 10. Here, the distance between the tip of the clamp pin 14 and the work 52: d _C R and d _C L Are different (d _C R> d _C L). Then, when a pressing force is applied to the input pin 16 from this state to cause the clamp pins 14 and 14 to protrude, first, as shown in FIG. Comes into contact with the workpiece 52. Next, when the input pin 16 is further moved in the axial direction by applying a pressing force from that state, the wedge pin 30 moves along with the axial movement of the input pin 16 and the input pin 16 In the direction perpendicular to the axial direction (the axial direction of the clamp pin 14), it is moved relative to the input pin 16 in the right direction in the figure. As a result, only the other clamp pin 14 on the right side in the drawing is protruded and moved until it comes into contact with the workpiece 52. Finally, as shown in FIG. The clamp pins 14 and 14 can be reliably brought into contact with each other. Therefore, it is possible to avoid the problem that the pressing force applied to the workpieces 52 and 52 on both sides varies and the pressing force on one of the workpieces 52 is insufficient. It becomes possible to clamp.

  The exemplary embodiments of the present invention have been described in detail above. However, the embodiments are merely examples, and the present invention is limited in any way by specific descriptions according to such embodiments. It should be understood that it is not interpreted.

  For example, FIG. 13 shows another embodiment of the clamp structure according to the present invention in the form of a plan view. In the clamp structure shown in FIG. 13, parts having the same structure as the clamp structure according to the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 13, one rectangular flat plate-shaped workpiece 88 is arranged on each side of the row of the three clamp devices 84, 84, and 86 arranged in a row at the center of the substrate 50. In this embodiment, L-shaped guide rails 90 and 90 are used as guide members, and the guide rail 90 is provided on the clamp body 12 of the clamp device 84 as shown in FIG. By being fitted in the groove 92, the clamping devices 84, 84 are moved and guided in the arrangement direction. Here, the clamp device 86 at the forefront in the pressing force acting direction is held in a fixed position on the substrate 50 by bolts 94 and 94. For this reason, the arrangement of the stopper block 68 and the stopper pin 70 for restricting the movement of the foremost clamping device 86 and applying a pressing force to each of the clamping devices 84 and 86 is here. It ’s unnecessary.

  The extension bar 62 is screwed and connected to the clamp pin 14 of the clamp device 86, and the tip of the clamp pin 14 is held on the substrate 50 in a fixed position. It is screwed and connected to the input pin 16 of the provided one-side clamp device 96. Therefore, the clamping device 86 does not directly clamp the work but functions to change the direction of the pressing force that is sequentially applied. The workpiece holding blocks 98, 98, 98 are fixedly provided at positions facing the pins 88 and 84 with the workpiece 88 sandwiched by the protrusions of the clamp pins 14, 14 of the clamp devices 84, 84 and the clamp pin 14 of the one-side clamp device 96. In between, the work 88 is pressed and fixed.

  As is clear from FIG. 15, the one-side clamp device 96 has the same configuration as that of the clamp device 10 according to the previous embodiment, on the side where the clamp pin 14 is arranged. On the other hand, on the side where the clamp pin 14 is not disposed, the end portion of the wedge pin 30 is a flat surface 100 and is in sliding contact with the surface of the contact plate 104 fitted in the bottom portion of the clamp pin insertion hole 102. It is configured as follows. Further, the abutting plate 104 is fixed in a form in which it abuts on a step portion 108 formed at the bottom of the clamp pin insertion hole 102 by a bolt 106 screwed from the outside.

  FIG. 16 shows another embodiment of the clamp structure according to the present invention in a cross-sectional view. In this case, the clamping device 10 is arranged in two upper and lower stages, which is effective when clamping a relatively tall workpiece. In this case, a pressing plate 110 is provided at the tip of the pressing rod 66 extending from the pressing device 64 so that the pressing force is simultaneously applied to the input pins 16 and 16 of the upper and lower clamping devices 10 and 10. Is preferable.

  Further, the inclination angle of the inclined surface 44 and the pressing surface 46 for converting the pressing force of the input pin 16 into the pressing force of the clamp pin 14 is not limited to an angle of 45 ° with respect to the axes of the input pin 16 and the clamp pin 14. These are set appropriately in consideration of the relationship between the pressing force applied from the pressing device 64 and the pressing force applied to the workpiece 52, the relationship between the stroke (movement distance) of the input pin 16 and the clamp pin 14, and the like. It will be.

  Furthermore, the form of the recess provided in the clamp pin 14 is not limited to the long hole 38 penetrating to reach the hole 34 of the clamp pin 14 as illustrated. Absent. Further, the biasing means for biasing the clamp pin 14 so as to retract to the original position is not limited to the compression coil spring 42, and a known elastic member or the like is appropriately used. Note that such a biasing means is not necessarily required, and in the case where the biasing means is not provided, a mechanism for returning each member to the original position in the clamp device 10 does not operate. Since the configuration of the clamping device 10 is simplified correspondingly, the clamping device 10 itself can be made more compact and less expensive.

  In addition, in the multiple workpiece clamping structure according to the present invention, when the pressing force is applied, the pressing force is applied by, for example, a screw feed mechanism instead of the pressing device 64 driven by fluid pressure as described above. It is possible to do so. However, it can be said that it is more preferable to use a pressing device driven by fluid pressure in terms of automation of the entire clamp structure and reduction of work man-hours.

  In addition, although not listed one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the present invention.

10, 84, 86 Clamp device 12 Clamp body 14 Clamp pin 16 Input pin 30 Wedge pin 38 Long hole 40 Stop pin 42 Compression coil spring 44 Inclined surface 46 Press surface 50 Base 52, 88 Work 62 Extension bar 64 Press device 72 Guide bar 96 One side clamp device

Claims (7)

A plurality of clamping devices are arranged in a row, and at least one workpiece is arranged on each side of the row of the clamping devices, and at least one workpiece arranged on both sides by the operation of the plurality of clamping devices. To make a clamp structure of multiple workpieces that can be fixed,
The clamp device is movable in an axial direction in which a pressing force is applied to an end protruding from the clamp body, and is movable coaxially and in a direction perpendicular to the axial direction of the input pin. And one end portion is protruded to the side of the clamp body, while inclined surfaces inclined in opposite directions with respect to the axis of the input pin are formed on the other opposite end portion, respectively. Two clamp pins, and pressing surfaces that are inclined corresponding to the inclined surfaces of the end portions of the two clamp pins are provided at both ends, respectively, and the inclined surfaces and the pressing surface are arranged to contact each other, A wedge pin separate from the input pin that protrudes laterally by pressing the two clamp pins away from each other by axial movement of the input pin is housed in the clamp body. Have that structure,
A plurality of the clamping devices are arranged such that the input pins of the front side clamping device are pressed by the rear side clamping device in the direction of the pressing force of the input pins. By applying a pressing force to the input pins of the clamping device located at the rearmost side in the pressing force acting direction, the pressing force is applied to the input pins of the plurality of clamping devices from the clamping device on the rear side in the pressing force acting direction. The two clamp pins of the respective clamp devices are protruded laterally by sequentially acting so that they can contact and be pressed against at least one workpiece disposed on both sides of the row of the clamp devices. Multi-work clamping structure.   A pressing device driven by a fluid pressure is provided to apply a predetermined pressing force to an input pin of the clamping device located at the end of the pressing force acting direction in the row of the plurality of clamping devices. The multiple workpiece clamping structure according to claim 1.   The two clamp pins in the clamp device are each provided with a recess extending in the axial direction, whereas the tip of a stop pin fixed to the clamp body with respect to each recess of the clamp pin The clamp structure for a plurality of workpieces according to claim 1 or 2, wherein the portion is plunged and positioned so that the axial movement distance and rotation of the two clamp pins are restricted.   An extension bar having a predetermined length is attached to the input pin of the clamp device, and a tip portion of the extension bar is configured to be able to abut on the clamp device on the rear side in the pressing force acting direction. The multi-work clamping structure according to any one of claims 1 to 3.   The clamp device located in the forefront of the pressing force acting direction in the row of the plurality of clamp devices is configured to be held in a fixed position. Multiple workpiece clamping structure.   The guide member which guides the clamp apparatus except the thing located in the front of the said pressing force action direction among these several clamp apparatuses to the sequence direction is arrange | positioned. The clamp structure for multiple workpieces according to any one of the above.   The biasing means for biasing the two clamp pins projected by the wedge pins so as to retreat to their original positions is disposed in the clamp body. 2. A multi-work clamping structure according to item 1.

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