JP3116879U - Nipper - Google Patents

Abstract

Provided is a nipper capable of improving accuracy and stability of reciprocating operation of a cylinder and ensuring cutting accuracy.
A nipper case 6 having a nipper blade body 7 is provided at the front end in the axial direction of a first cylinder 13, a second cylinder 23 is provided at the rear end in the axial direction, and a rear end of a second piston 24 of the second cylinder 23 is a side surface. It is fixed to the vertical portion 5A of the L-shaped attachment member 5, and the horizontal portion 5B of the attachment member 5 and the first cylinder 13 are slidable along the axial direction of the second cylinder 23, and the vertical portion of the attachment member 5 The engaging portion 21 is provided with an impact absorbing means 53 that can absorb vibration in a direction perpendicular to the axial direction of the second cylinder 23 in the horizontal plane. It was.
[Selection] Figure 1

Description

  The present invention relates to a nipper having a slide function that is suitably employed when a molded product is gated with an automatic plastic molded product take-out device.

  In general, it is known that a slide-type air nipper is attached to an automatic take-out device in order to perform gate processing of a molded product taken out from a plastic molding machine (see, for example, Patent Document 1). The nipper case includes a nipper case having a nipper blade body that is actuated by axial sliding of the first piston on the front end side in the axial direction of the first cylinder in which the first piston is fitted so as to be axially slidable. The second cylinder is connected to the rear end side in the axial direction of the first cylinder, and the second piston is fitted to the second cylinder so as to be able to slide relative to the sliding direction of the first cylinder. The rod portion projecting rearward from the second cylinder is connected to the second piston, and the rod portion is fixed to the vertical portion of the substantially L-shaped mounting member in side view, and in the vicinity of the tip of the horizontal portion of the mounting member A long hole extending in the axial direction of the first cylinder is formed, and a guide pin attached to the first cylinder by a retaining bolt is inserted into the long hole, and the second cylinder and the second piston are inserted into the long hole. The first cylinder is integrated and slides in the axial direction. It is so as to advance and return a nipper blade body by.

The forward drive of the second cylinder relative to the second piston is performed by supplying air to the rod part side in the second cylinder, and the backward drive of the second cylinder is performed on the second piston head side in the second cylinder. This is performed by the fitted return coil spring.
No. 8-55

Since the air gripper is normally operated for 24 hours, in the above prior art, the sliding guide of the first cylinder is performed by the long hole and the guide pin. In addition to poor sliding accuracy and poor durability, it also causes loosening of screws at each part. In addition, there is a problem that the required cutting accuracy cannot be obtained if there is a backlash when the robot is mounted on a robot.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a nipper capable of improving accuracy and stability of cylinder reciprocating operation and ensuring cutting accuracy.

In order to achieve the above object, the present invention has taken the following measures.
That is, the nipper according to the present invention includes a first cylinder in which a first piston is fitted so as to be slidable in the axial direction, and is actuated by sliding the first piston in the axial direction on the front end side in the axial direction. A nipper case having a nipper blade body is provided, a second cylinder is coupled to the axially rear end side of the first cylinder, and the second cylinder is slid in a direction coaxial with the sliding direction of the first cylinder. A second piston is fitted so as to be movable, and a rod portion projecting rearward from the second cylinder is connected to the second piston. The mounting member is fixed to the vertical portion of the mounting member, and the horizontal portion of the mounting member and the first cylinder are slidable along the axial direction of the second cylinder and are prevented from coming off in the direction along the vertical portion of the mounting member. Engage with the state to form an engagement part, It is characterized in that the vibration direction of the perpendicular to the axial direction of the second cylinder in the plane to a point in which a shock-absorbing means allowing absorption.

With this configuration, the first cylinder is stably supported by the mounting member and smoothly slides to ensure the accuracy of forward / backward movement, and the axial direction (sliding) of the second cylinder is achieved by the impact absorbing means. Vibration generated in a direction orthogonal to the (moving direction) is sufficiently absorbed. Therefore, conventional problems such as breakage of parts and backlash, deterioration of sliding accuracy, loosening of screws, and reduction of cutting accuracy are solved. Moreover, since the structure is simple, there is an advantage that there is no failure, maintenance is easy, and durability is improved.
One of the horizontal portion of the mounting member or the portion of the first cylinder that faces the horizontal portion of the mounting member is provided with a convex rail, and the other is provided with a concave rail that fits outside the convex rail. In this case, the impact absorbing means is a strip-shaped plate spring that is curved in the longitudinal direction of each rail between the rail side surface of the convex rail and the inner side surface of the concave rail facing the rail surface. It can be configured by interposing a material. By adopting such a configuration, it is possible to simplify the structure especially as the shock absorbing means.

  An engagement groove constricted in a triangular shape is formed along the longitudinal direction of the rail side surface of the convex rail, and between the rail side surface of the convex rail and the inner side surface of the concave rail facing the rail, An auxiliary rail that comes into contact with the engagement groove in a wedge shape corresponding to the constriction shape is fitted, and the leaf spring material can be interposed between the auxiliary rail and the inner surface of the concave rail. .

  The nipper according to the present invention can improve the accuracy and stability of the cylinder reciprocating operation and ensure the cutting accuracy, and can improve the durability without a failure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 8 show an embodiment of a nipper 1 according to the present invention. As shown in FIGS. 1 and 2, the nipper 1 includes a nipper main body 2, a blade body opening / closing operation unit 3, a position change drive unit 4, and an attachment member 5.
The nipper main body 2 includes a nipper case 6, a pair of nipper blade bodies 7, a bush 8 that rotatably attaches both nipper blade bodies 7 to the case 6, a hollow shaft 9, a shaft fixing screw 10, and a nipper opening biasing force. Spring (not shown).

  The nipper case 6 is connected and integrated with the blade body opening / closing operation unit 3 by assembly screws 12 provided at the four corners of the shaft with the shaft fixing screw 10 parallel to the shaft center. The blade body opening / closing operation unit 3 includes a first cylinder 13 in which an aluminum alloy is formed into a hollow structure by an extrusion method, and a tapered surface opening / closing operation surface 14 which is bifurcated at one end and sequentially expands toward the front end of the opposing surface. And a first piston 15 slidably fitted in the axial direction in the first cylinder 13, an oval piston ring 16, a side plate 17 on the nipper case 6 side (front end side), A spring receiving cylinder 19 having a first piston insertion hole 18 and a coil spring 20 for returning the piston are provided. That is, the nipper case 6 is attached and fixed to the front end side in the axial direction of the first cylinder 13 via the side plate 17.

The first cylinder 13 has an oblong cylinder hole 13A formed in its hollow interior, and the lower portion of the outer shell is used as a configuration of an engaging portion 21 for engaging the first cylinder 13 and the mounting member 5. The concave rail 22 is provided in parallel with the cylinder axial direction. The concave rail 22 is formed as a groove having a U-shaped cross section that opens downward, and has a top surface 22A and a pair of left and right inner surfaces 22B.
The first piston 15 has an oval piston portion 15A and a cylindrical rod portion 15B protruding forward (forward), and the tip of the rod portion 15B is a tapered inner surface parallel to the long axis of the piston portion 15A. That is, it is formed as the opening / closing operation surface 14 described above, and the coil spring 20 is externally fitted to the rod portion 15B. The piston portion 15A is hollow.

  The position change drive unit 4 is coupled to the cylinder hole 13A of the first cylinder 13 in a coaxial fitting state (that is, coupled to the axially rear end side of the first cylinder 13). A second cylinder 24 having a circular section having a rod portion 24A fitted in the second cylinder 23 so as to be slidable in the axial direction, and a cylinder hole 23A of the second cylinder 23 The outer end portion of the rod portion 24A is fitted to the mounting member 5 and communicates with the rear end wall side in the second cylinder 23. An air supply / discharge path 27 is provided.

  The second cylinder 23 is made of a die-cast aluminum alloy, and has a rectangular mounting flange portion 28 whose outer shape is the same as that of the first cylinder 13 and is formed at the intermediate portion in the axial direction. The front outer shape of the tip of the portion 28 is oval and can be fitted into the cylinder hole 13A of the first cylinder 13 without rattling. Further, the rear outer shape of the second cylinder 23 is a shape protruding in a short cylindrical shape, and a liner member 29 for holding the rod portion 24A of the second piston 24 is fitted into the inner cylinder hole 23A. In the center of the wall, a rod through hole 30 is provided through which the rod portion 24A is inserted.

In the upper part of the second cylinder 23, an air supply / discharge path 31 for driving the first piston forward is provided in a penetrating manner in the axial direction. By doing so, the forward / backward reciprocating drive of the second cylinder 23 relative to the second piston 24 can be performed smoothly, reliably and stably by air, that is, the working fluid.
The mounting flange portion 28 includes assembly screw insertion holes (not shown) penetrating in the axial direction at the four corners, and is fixedly connected to the first cylinder 13 by assembly screws (not shown) using the insertion holes. ing. In FIG. 1, 35 is a piston ring, 36, 37, and 38 are seal rings, and 39 is a retaining ring for the closing disk 25.

  As shown in FIGS. 3 to 5, the mounting member 5 has an L-shaped side surface having a vertical portion 5A and a horizontal portion 5B, and the corner portions of the vertical portion 5A and the horizontal portion 5B are reinforced by reinforcing ribs 5C. The rod portion 24A of the second piston 24 is inserted into the mounting hole 40 provided at the upper end portion of the vertical portion 5A, and is fixed by a hollow screw with an air supply / discharge passage (not shown). A female screw hole 41 is provided in the lower portion of the mounting hole 40, and a stopper bolt 43 screwed with a nut 42 is screwed into the female screw hole 41, and the tip of the stopper bolt 43 is attached to the mounting flange portion of the second cylinder 23. 28 is adapted to face the stopper 44 provided at the rear end.

Therefore, if the nut 42 is loosened with respect to the stopper bolt 43 so that the nut 42 is separated from the vertical portion 5A, the screw bolt adjustment of the stopper bolt 43 with respect to the female screw hole 41 becomes free, and the second cylinder 23 extends from the vertical portion 5A. The length of the stopper bolt 43 can be adjusted. After this length adjustment, if the nut 42 is tightened against the stopper bolt 43 so as to press the nut 42 against the vertical portion 5A, the adjustment length of the stopper bolt 42 is achieved by the double nut action of the female screw hole 41 and the nut 42. Is fixed.
On the upper surface of the horizontal portion 5B of the mounting member 5, a convex rail used in the configuration of the engaging portion 21 for engaging the mounting member 5 and the first cylinder 13 in the front-rear direction (axial direction) first half portion. 45 is provided at the center in the left-right direction and parallel to the axial direction. Engaging grooves 46 constricted in a triangular shape are formed on the side surfaces of the left and right rails of the convex rail 45 so as to face each other along the longitudinal direction thereof, and the upper end surface is closer to the dovetail cross section. It is formed as a top rail portion 45A. The engaging groove 46 includes an upper guide surface 46A that is inclined inward and closer to the top rail portion 45A, and a lower guide surface 46B that is inclined outward at a lower portion. Note that a plurality of mounting holes 47 to a plastic molded product automatic take-out device or the like are provided at appropriate positions on the lower surface of the horizontal portion 5B.

  As shown in FIGS. 1 and 2, the convex rail 45 of the first cylinder 13 is covered with the convex rail 45 of the mounting member 5, and the top of the convex rail 45 is in a fitting relationship with each other. The upper surface of the rail portion 45A and the top surface 22A in the groove of the concave rail 21 are in contact with or in close proximity to each other. At this time, there is a gap between the rail side surface of the convex rail 45 (upper guide surface 46A and lower guide surface 46B of the engaging groove 46) and the inner side surface of the concave rail 21 (the inner surface 22B facing the right and left in the groove). An auxiliary rail 50 is fitted, and more specifically, a leaf spring material 51 is interposed between the auxiliary rail 50 and the inner side surface (inner surface 22B) of the concave rail 21.

As shown in FIGS. 6 and 7, the auxiliary rail 50 includes two inclined surfaces 50 </ b> A that abut against the upper guide surface 46 </ b> A and the lower guide surface 46 </ b> B of the engagement groove 46, respectively, and a vertical connecting the two surfaces. It is a rod having a wedge-shaped cross section having a surface 50B. A chamfered radius 50C is provided between the two inclined surfaces 50A. Further, a square groove 52 is formed in the vertical surface 50B along the rail longitudinal direction, and the leaf spring material 51 is accommodated in the square groove 52.
As shown in FIG. 8, the leaf spring material 51 is formed from a strip that is curved in the longitudinal direction with respect to the convex rail 45 and the concave rail 21. Needless to say, by applying an external force in the direction in which the curve is extended, a resilient action is made to return it to its original curved shape.

  As shown in FIGS. 1 and 2, the rail side surface of the convex rail 45 (the upper guide surface 46A and the lower guide surface 46B of the engagement groove 46) and the inner side surface of the concave rail 21 (the left and right sides in the groove) are opposed to each other. The auxiliary rail 50 is fitted between the inner surface 22B), and the leaf spring material 51 is interposed between the auxiliary rail 50 and the inner surface (inner surface 22B) of the concave rail 21, so that the horizontal portion of the mounting member 5 is provided. 5B and the first cylinder 13 are slidable along the axial direction of the second cylinder 23, but engaged in a state in which they are prevented from coming off in the direction along the vertical portion 5A of the mounting member 5. Therefore, the engaging portion 21 is configured here, and shock absorption that enables absorption of vibration in a direction perpendicular to the axial direction of the second cylinder 23 in the horizontal plane mainly due to the presence of the leaf spring material 51. Means 53 are configured Than it is.

  The auxiliary rail 50 and the leaf spring material 51 have both longitudinal ends thereof extending below the mounting flange portion 28 of the second cylinder 23 attached to the first cylinder 13 and the lower end of the nipper case 6. The first cylinder 13 is sandwiched between the side plates 17 that coincide with the lower end of the concave rail 22 of the first cylinder 13, so that the first cylinder 13 is not displaced in the cylinder axial direction. At the same time, a drop-off prevention plate 56 fixed by screws 55 so as to be attached to both sides of the concave rail 22 from below prevents the first cylinder 13 from dropping off and rattling.

  Next, the operation of the nipper 1 of this embodiment will be described with reference to FIG. First, the mounting member 5 is fixed to a take-out device or the like of a plastic molding machine, and corresponds to the spool portion 71 of the molded product 70 and faces the cutting reference surface 70A of the gate portion 72 so as to face the flat portion 7A of the nipper blade body 7. Is set so that the distance between the flat surface portion 7A and the cutting reference surface 50A is equal to or less than the stroke S of the second cylinder 23 (the maximum stroke of the nipper blade body 7). Therefore, when air is supplied from the air supply / discharge passage 27 into the second cylinder 23 of the position change drive unit 4 fixed to the mounting member 5, the second cylinder 23 moves in the direction indicated by the arrow X in FIG. It moves to the left in FIG. Accordingly, the concave rail 22, the auxiliary rail 50, and the leaf spring material 51 of the first cylinder 13 slide integrally with respect to the convex rail 45 of the mounting member 5 in the direction indicated by the arrow X in FIG. The flat portion 71 of the body 7 comes into contact with the cutting reference plane 50A.

  Subsequently, when air is supplied from the air supply / discharge passage 31 into the first cylinder 13, the first piston 15 slides against the arrow Y (left) in FIG. 1 against the elastic force of the coil spring 20. Then, the lever 7B having the tapered opening / closing operation surface 14 extending at the rear end of the nipper blade body 7 is pushed inwardly from both the left and right outer sides, the both nipper blade bodies 7 approach and close, and the gate portion 72 is cut. In this way, the cutting of the gate portion 72 of the molded product 70 is completed, and at the same time, the first piston 15 causes the elastic force of the coil spring 20 by discharging the air from the first cylinder 13 through the air supply / discharge passage 31. The nipper blade 7 is opened by retreating in the direction of the arrow X (rightward) in FIG. Further, by discharging air from the second cylinder 23 through the air supply / discharge passage 27, the second cylinder 23 is directed to the second piston 24 in the direction indicated by the arrow Y in FIG. 1 (left: in FIG. 9). It moves together with the first cylinder 13 to the right) and returns to the state before the series of operations. With the above operation, one cycle of the cutting operation from the gate portion 72 of the spool portion 71 is completed.

  When the nipper blade body 7 is opened and closed, the concave rail 21 of the first cylinder 13 is put on the convex rail 45 of the mounting member 5 and is in a state of fitting with each other. Since the shock absorbing means 53 (mainly the leaf spring material 51) is formed between the rail side surface and the inner side surface of the concave rail 21, the first cylinder 13 is stably supported and rattling due to cutting vibration is prevented. As a result, it is possible to improve the accuracy and stability of cylinder reciprocation, ensure cutting accuracy, improve durability, and prevent the occurrence of screw loosening at each part. It is possible to increase the productivity.

By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.
For example, pressure oil can be used in place of air as the working fluid, the spring receiving cylinder 19 of the blade body opening / closing operation unit 3 can be omitted, and the coil spring 20 can be directly supported by the side plate 17, and the nipper blade body 7 lever 7B may be bent in an L shape. Instead of the coil spring 20, a working fluid such as air may be supplied into the first cylinder 13.
Further, the concave rail 22 and the convex rail 45 are relative between the mounting member 5 and the first cylinder 13 and may be reversed from the above embodiment. The engaging groove 46 (upper guide surface 46A and lower guide surface 46B) can also be provided on the opposing inner surface 22B of the concave rail 22. It is also possible to provide the engaging groove 46 on both the rail side surface of the convex rail 45 and the opposing inner surface 22B of the concave rail 22 and form the auxiliary rail 50 in a rhombus cross section. The auxiliary rail 50 can be integrally provided on either the concave rail 22 or the convex rail 45. The engagement groove 46 and the auxiliary rail 50 can be omitted.

It is a sectional side view which shows one Embodiment of the nipper which concerns on this invention. It is the sectional view on the AA line of FIG. It is a side view of an attachment member. It is a BB line arrow directional view of FIG. FIG. 4 is a view taken along the line CC in FIG. 3. It is an end view of an auxiliary rail. FIG. 7 is a view taken along line DD in FIG. 6. The leaf spring material is shown, (A) is a plan view and (B) is a side view thereof. It is gate part cutting operation explanatory drawing of a molded article.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nipper 5 Mounting member 5A Vertical part 5B Horizontal part 6 Nipper case 7 Nipper blade 13 First cylinder 15 First piston 21 Engagement part 22 Recessed rail 22A Inner side surface 23 Second cylinder 24 Second piston 24A Rod part 45 Convex type Rail 46 engaging groove 50 auxiliary rail 51 leaf spring material 53 shock absorbing means

Claims (3)

  The first piston (15) includes a first cylinder (13) fitted so as to be slidable in the axial direction, and the first piston (15) is slid in the axial direction on the front end side in the axial direction of the first cylinder (13). A nipper case (6) having a nipper blade body (7) that is actuated by movement is provided, and a second cylinder (23) is coupled to the axially rear end side of the first cylinder (13). (23) is fitted with a second piston (24) so as to be slidable in the same direction as the sliding direction of the first cylinder (13), and the second cylinder (23) is fitted to the second piston (24). A rod part (24A) projecting rearward from the vertical direction is provided, and the rod part (24A) is a vertical part of the mounting member (5) that is substantially L-shaped in side view with a horizontal part (5B) and a vertical part (5A). While fixing to the part (5A), the horizontal part (5B) of the mounting member (5) and the first cylinder ( 3) is engaged in a state that is slidable along the axial direction of the second cylinder (23) and is prevented from coming off in the direction along the vertical portion (5A) of the mounting member (5). (21) is formed, and this engaging portion (21) is provided with shock absorbing means (53) that can absorb vibration in a direction perpendicular to the axial direction of the second cylinder (23) in the horizontal plane. Characteristic nippers.   A convex rail (45) is provided on one of the horizontal portion (5B) of the mounting member (5) or the portion of the first cylinder (13) facing the horizontal portion (5B) of the mounting member (5). On the other hand, there is provided a concave rail (22) that is externally fitted to the convex rail (45), between the rail side surface of the convex rail (45) and the inner side surface of the concave rail (22) facing this. Further, the shock absorbing means (53) is constituted by interposing a strip-shaped leaf spring material (51) curved in the longitudinal direction of each rail. Nippers.   An engagement groove (46) constricted in a triangular shape is formed on the rail side surface of the convex rail (45) along the longitudinal direction thereof, and the rail side surface of the convex rail (45) and the concave rail facing the rail. An auxiliary rail (50) that contacts the engagement groove (46) in a wedge shape corresponding to the constricted shape is fitted between the inner side surface of (22) and the auxiliary rail (50) and the concave rail. The nipper according to claim 2, wherein the leaf spring material (51) is interposed between the inner side surface of (22).

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