JP2020142260A - Riveter - Google Patents

Abstract

To provide a riveter that enables a rivet to be held by a jaw and that has a high degree of design freedom.SOLUTION: A riveter 1 for use in attachment of a blind rivet R to a fastening object comprises an urging part 7 for temporary fixing, which urges a jaw case 3 in a base end direction. The urging part 7 for temporary fixing exerts an urging force F, which moves the jaw case from a tip side to a base end side before arriving at a base end position, on the jaw case 3, when a drive part 6 for generating a driving force for reciprocating the jaw case 3 within a casing 2 is not operated.SELECTED DRAWING: Figure 2

Description

The present invention relates to a riveter used when attaching a blind rivet to an object to be fastened.

The riveter fixes the blind rivet (hereinafter referred to as “rivet”) set at the tip to the object to be fastened by passing it through a through hole provided in the object to be fastened and then plastically deforming and crimping it. it can. The rivet has a rod-shaped mandrel. When the rivet is plastically deformed, this mandrel is grasped by a jaw in the riveter and pulled into the inside of the rivet. At this time, the mandrel is broken and a part remains in the rivet, and the other part is separated from the rivet.

Before construction, it is necessary to position the rivet on the jaw in the riveter. Here, before the construction, the jaw does not grasp the mandrel in the rivet, and the rivet (mandrel) can move in the axial direction with respect to the jaw. In a construction site where sufficient space is secured around the rivet, there is no problem because the rivet can be held so that it does not separate from the jaw (so that it does not fall) by the operator touching the tip of the riveter. However, for example, when it is necessary to attach a rivet to the back of a deep groove-shaped space, the worker may not be able to touch the tip of the riveter because the worker cannot reach the construction site. .. In this case, for example, if the tip of the riveter faces downward, the rivet will fall off from the jaw before construction, and construction will not be possible depending on the positional relationship of the objects to be fastened, which is a problem.

Here, Patent Document 1 describes that the rivet is positioned on the jaw by air suction (see paragraph 0069 of the specification). In this way, it is possible to hold the rivet if the riveter is configured to use air. It is also conceivable to attach another part that exerts urging force or frictional force on the mandrel to the tip of the riveter (specifically, the nose piece through which the mandrel penetrates).

However, the degree of freedom in designing the riveter has been restricted because it is necessary to use an air-based riveter and a separate member for holding the rivet is required.

JP-A-2007-222924

Therefore, an object of the present invention is to provide a riveter capable of holding a rivet in a jaw and having a high degree of design freedom.

The present invention relates to a riveter used for attaching a blind rivet to an object to be fastened, a tubular casing extending in one direction, a jaw case reciprocating in the casing between a tip position and a base end position, and the above. A jaw provided at the tip of the jaw case and capable of sandwiching the rod-shaped mandrel of the blind rivet in the radial center, and the mandrel provided at the tip of the casing so as to go from the outside to the inside of the casing. A nose piece that can be engaged with the jaw on the base end side, a drive unit that generates a driving force for reciprocating the jaw case, and a temporary biasing of the jaw case toward the base end. The jaw has a plurality of sandwiching portions for sandwiching the mandrel, and the plurality of sandwiching portions expand in the radial direction with each other as the jaw reciprocates. It changes between an open state in which the casing is not sandwiched and a closed state in which the mandrel is sandwiched by narrowing each other in the radial direction, and when the jaw case is in the tip position, the jaw is engaged with the nose piece. When the jaw case is in the opening state and the jaw case is in the base end position, the jaw is in the closed state, and the temporary fixing rivet portion is attached to the jaw case when the driving unit does not operate. The riveter is characterized in that it exerts an urging force to move the base end side from the tip position to the extent that it does not reach the base end position.

According to this configuration, the temporary fixing rivet portion exerts an rivet force on the jaw case to move the jaw case from the tip position to the base end position to the extent that the jaw is lightly closed. Therefore, for example, even if the tip of the riveter is turned downward, the rivet can be held so that the rivet does not fall off from the jaw.

Further, a jaw opening means for bringing the jaw into the opened state by moving the jaw case to the tip position is further provided, and the temporary fixing urging portion does not operate the driving portion and the jaw is opened. When the force for moving the jaw case to the tip position by the opening means is released, the jaw case is moved from the tip position to the base end position to the extent that it does not reach the base end position. It can exert power.

According to this configuration, the jaw is always lightly closed when the drive unit does not operate due to the provision of the temporary fixing urging portion, whereas the jaw opening means is operated. Joe can be forced to open.

Further, the jaw opening means is connected to an air cylinder into which high-pressure air is introduced from the outside and the jaw case, and a piston that moves the jaw case to the tip position by introducing high-pressure air into the air cylinder. Can be equipped with.

According to this configuration, the jaw opening means can be operated by introducing high-pressure air, so that the jaw opening means can be designed in the same manner as a general air tool.

Further, the temporary fixing urging portion may be provided at a position closer to the base end side than the jaw.

According to this configuration, the transmission path of the urging force of the temporary fixing urging portion can be simplified.

Further, the driving unit may generate the driving force by hydraulic pressure, and the temporary fixing urging unit may urge a member that pressurizes the hydraulic oil in the driving unit.

According to this configuration, since the urging force can be applied to the jaw case via the hydraulic oil, the degree of freedom in arranging the temporary fixing urging portion in the riveter can be increased.

In the present invention, the jaw can be lightly closed by the urging force of the urging portion for temporary fixing. In addition, it is no longer necessary to use an air-based riveter, and a separate member for holding the rivet is not required. Therefore, it is possible to hold the rivet on the jaw and provide a riveter with a high degree of design freedom.

It is a perspective view which shows the riveter which concerns on one Embodiment of this invention. It is a vertical sectional view of the riveter. It is the enlarged sectional view of the main part which shows the operation of the riveter, (a) shows the open state of the holding part of a jaw, (b) shows the closed state of the holding part and is lightly closed, and (c). ) Indicates a closed state of the holding portion and is strongly closed. It is a vertical sectional view of the main part of the riveter according to another embodiment (No. 1) of this invention. It is a vertical sectional view of the main part of the riveter according to another embodiment (No. 2) of this invention.

Hereinafter, the riveter 1 according to the embodiment of the present invention will be described with reference to the drawings. In the following, for convenience, the left side in FIGS. 1 and 2 is referred to as the "tip side" and the right side is referred to as the "base end side". Further, the left side in FIGS. 1 and 2 is referred to as "front" and the right side is referred to as "rear".

Of the riveter 1 of the present embodiment, the main parts from the viewpoint of explaining the invention are the casing 2, the jaw case 3, the jaw 4, the nose piece 5, the drive unit 6, the temporary fixing urging unit 7, and the jaw opening means ( The push piston portion 8). In addition to these, the main parts from the viewpoint of the function of the riveter 1 are the handle 9 that the operator grasps during construction and the operator's finger to perform the operation of plastically deforming and crimping the rivet. Trigger 10 can be mentioned.

The casing 2 has a tubular shape extending in one direction in the front-rear direction. The casing 2 of the present embodiment is composed of three parts 21 to 23 connected to the front and rear. Therefore, for example, the overall length of the casing 2 can be changed by changing the length of the component 22 at the center of the front and rear. Therefore, it is advantageous that the versatility of the riveter 1 can be improved, for example, it can be made suitable for construction in a groove-shaped space.

The jaw case 3 reciprocates in the casing 2 in a predetermined section in the front-rear direction between the tip end position and the base end position. The jaw case 3 of the present embodiment reciprocates inside the component 21 on the front end side (front side) of the casing 2. When the jaw case 3 is at the tip position, the rivet R before construction is set with respect to the jaw 4. As the jaw case 3 moves from the tip position to the base end position, the mandrel M of the rivet R grasped by the jaw 4 is pulled into the riveter 1, and along with this pulling, the rivet R (surrounding the outer circumference of the mandrel M) is drawn. The portion) is plastically deformed so as to be shortened in the axial direction (see FIG. 3C). As a result, the rivet R is fixed to the object to be fastened.

The inner peripheral surface 31 at the tip of the jaw case 3 is a tapered surface whose diameter dimension decreases toward the tip. Further, inside the jaw case 3, a jaw pusher 32 that moves in the front-rear direction with respect to the jaw case 3 and a jaw pusher spring 33 that urges the jaw pusher 32 toward the tip end side are provided. The jaw pusher spring 33 is a coil spring (push spring) and constantly generates a spring force.

An extension shaft 11 extending in the front-rear direction is integrally connected to the base end of the jaw case 3 in the present embodiment. The tip of the extension shaft 11 is located inside the component 21 on the front end side (front side) of the casing 2, and the proximal end is located inside the component 23 on the proximal end side (rear side) of the casing 2. The extension shaft 11 reciprocates back and forth by being driven by a drive unit 6 described later. Along with this, the jaw case 3 connected to the extension shaft 11 also reciprocates back and forth.

The jaw 4 is the tip end portion of the jaw case 3, is provided on the tip end side of the jaw pusher 32, and moves back and forth together with the jaw case 3. The jaw 4 has a plurality of holding portions 41 that sandwich the mandrel M in the rivet R. Each sandwiching portion 41 has a wedge shape, and the outer peripheral surface 411 in the radial direction moves along the inner peripheral surface 31 (tapered surface) at the tip portion of the jaw case 3. Therefore, the jaw 4 can sandwich the mandrel M of the rivet R at the center in the radial direction.

The plurality of sandwiching portions 41 are in an open state in which the jaws 4 are reciprocated with respect to the jaw case 3 so as not to sandwich the mandrel M by expanding in the radial direction, and in a closed state in which the mandrel M is sandwiched by narrowing in the radial direction. Varies between. The plurality of sandwiching portions 41 in the present embodiment are always in either the open state or the closed state, and are not in the intermediate opening state. However, the holding force for holding the mandrel M in the closed state is set to be strong or weak. When the holding force is weak, the mandrel M is temporarily fixed to the jaw 4. The holding force at this time is weaker than the force that plastically deforms the rivet R, but is a force that can hold the mandrel M on the jaw even if the tip of the riveter 1 faces downward, for example. On the other hand, when the holding force is strong, the mandrel M is held (mainly stopped) by the jaw 4 with a strength that can withstand the force that plastically deforms the rivet R.

Pushed by the jaw pusher 32 urged by the jaw pusher spring 33, the plurality of holding portions 41 move toward the tip of the jaw case 3. Since the inner peripheral surface 31 on the tip end side of the jaw case 3 is a tapered surface, the plurality of sandwiching portions 41 change so as to close each other as the jaw case 3 moves along the inner peripheral surface 31. However, when the jaw case 3 moves toward the tip of the casing 2 to some extent, the nose piece 5 engages (specifically, abuts) the tip portions of the plurality of holding portions 41 (see FIG. 3A). .. Therefore, the plurality of sandwiching portions 41 cannot move further toward the tip of the jaw case 3. Therefore, the plurality of sandwiching portions 41 are eventually opened. On the other hand, when the jaw case 3 moves in the proximal direction (rearward), the tip portions of the plurality of holding portions 41 are separated from the nose piece 5, and the movement is not blocked by the nose piece 5, so that the jaw case 3 is pushed by the jaw pusher 32. The plurality of sandwiching portions 41 move toward the tip end side from the state in which the movement is blocked and are closed (see FIG. 3C). As described above, when the jaw case 3 is in the tip position, the holding portion 41 of the jaw 4 is opened by the contact with the nose piece 5. Then, when the jaw case 3 is in the proximal position, the holding portion 41 of the jaw 4 is closed. The state shown in FIG. 3B indicates the moment when the tip portions of the plurality of holding portions 41 are about to separate from the nose piece 5, and in this case, the holding portion 41 of the jaw 4 is in the closed state. It has become.

The nose piece 5 is fixed to the tip end portion of the casing 2, and the proximal end side projects into the internal space on the tip end side of the casing 2. The nose piece 5 has a space into which the mandrel M can be inserted so as to go from the outside to the inside of the casing 2. Then, the jaw 4 (in this embodiment, the slope is formed as shown in FIGS. 3 (a) to 3 (c)) of the nose piece 5 abuts on the tip end side of the jaw 4. Specifically, it is possible to prevent the space at the center of the radial center of the plurality of holding portions 41) from shrinking, and to open the holding portions 41 of the jaw 4.

The drive unit 6 is a portion that generates a driving force for reciprocating the jaw case 3. The drive unit 6 in the present embodiment generates a driving force by hydraulic pressure, and is configured as an oil piston unit provided below the handle 9. The oil piston unit as the drive unit 6 extends vertically into the handle 9 and reciprocates between the tubular oil tank 61 that holds the hydraulic oil and the oil tank 61 to change the volume of the oil tank 61. A piston rod (first piston rod 62), an air cylinder (first air cylinder 63) provided below the oil tank 61, and the inside of the first air cylinder 63 connected to the first piston rod 62. It is provided with a piston (first piston 64) that moves up and down. Note that FIG. 2 shows a simplified structure, and the detailed structure such as an O-ring and a mechanism for introducing and releasing high-pressure air is omitted. By the way, the high pressure air is introduced and discharged at the lower part of the first air cylinder 63 (below the first piston 64).

An upper oil piston 65 that moves in the front-rear direction is provided above the handle 9. The upper piston rod 66 extends in the tip direction from the tip side of the upper oil piston 65 and is connected to the extension shaft 11. The upper oil piston 65 and the upper piston rod 66 are integrally formed. Therefore, the jaw case 3, the extension shaft 11, the upper piston rod 66, and the upper oil piston 65 move back and forth together.

The first piston rod 62 is provided with an O-ring (not shown) on the outer periphery thereof, so that hydraulic oil does not leak from the oil tank 61 even if it reciprocates. The lower end of the oil tank 61 is open so that it can reciprocate to the first piston rod 62, the upper end is connected to the inside of the casing 2, and the hydraulic pressure is applied to the extension shaft 11. The first air cylinder 63 is configured so that high-pressure air from a compressor or the like can be taken in and out above and below the first piston 64.

In the first air cylinder 63, when high pressure air is introduced below the first piston 64, the first piston 64 moves upward. Along with this, the first piston rod 62 moves upward, and the hydraulic pressure of the hydraulic oil pushed out from the oil tank 61 causes the upper oil piston 65 to move to the proximal end side, and the extension shaft 11 also moves to the proximal end side accordingly. Move to. As a result, the jaw case 3 moves to the proximal end side. At this time, since the mandrel M of the rivet R is held in the jaw 4, the mandrel M is drawn into the riveter 1. Then, the holding portion 41 of the jaw 4 is guided to the tip side by the inner peripheral surface 31 having a narrowed tip in the jaw case 3, so that the mandrel M is firmly gripped.

Further, in the first air cylinder 63, after the high-pressure air introduced below the first piston 64 is discharged to the outside of the drive unit 6, the upper oil piston 65 is moved by introducing the high-pressure air into the push piston unit 8. Move toward the tip. Along with this, the oil tank 61 is subjected to downward hydraulic pressure, so that the first piston rod 62 and the first piston 64 move downward. As a result, the hydraulic oil extruded from the oil tank 61 is pushed back to the oil tank 61, and the first piston rod 62 that receives the hydraulic pressure due to this is moved downward. Along with this, the first piston 64 moves downward. At the same time, the jaw case 3 moves to the tip side together with the extension shaft 11. At this time, the jaw 4 comes into contact with the nose piece 5 and is opened.

The temporary fixing urging portion 7 is a portion that urges the jaw case 3 in the proximal direction. The temporary fixing urging unit 7 exerts an urging force (temporary fixing urging force F) to move the jaw case 3 from the tip position to the base end side at least when the drive unit 6 does not operate. However, this temporary fixing force F is a part of the moving range of the jaw case 3, and the jaw case 3 does not reach the base end position. Specifically, the spring force generated by the temporary fixing urging portion 7 is set to a size capable of moving the upper oil piston 65 and the interlocking first piston 64 via hydraulic pressure. The difference in resistance (friction resistance) between the temporary fixing urging portion 7 and the upper oil piston 65 is the temporary fixing urging force F extending over the jaw case 3.

The jaw case 3 moves in the proximal direction (rearward) by the temporary fixing force F. Therefore, the tip of the jaw 4 is separated from the base end of the nose piece 5. As a result, the plurality of sandwiching portions 41 in the jaw 4 are narrowed to each other in the radial direction. However, since the temporary fixing force F extending over the jaw case 3 is set to be smaller than the force that plastically deforms the rivet R, the rivet R is not fastened. Therefore, the mandrel M is not pulled out with respect to the jaw 4 (specifically, when the extension direction of the casing 2 is substantially up and down and the tip of the casing 2 is positioned downward, the jaw 4 is stopped. It can be temporarily fixed to the extent that the rivet R does not fall due to gravity). Therefore, it is not necessary for the operator to put a hand on the tip of the riveter 1, to suck the rivet R in the air, or to provide the nose piece 5 with a separate member for holding the mandrel M.

In the present embodiment, the drive unit 6 does not operate, and the force for moving the jaw case 3 to the tip position by the jaw opening means (push piston unit 8) described later is released, that is, the jaw case 3 It is assumed that the temporary fixing urging portion 7 exerts the temporary fixing urging force F on the jaw case 3 when no positive force is applied toward the tip (forward). .. When the drive unit 6 does not operate, the jaw case 3 stays at the tip position. However, the jaw case 3 in this state can move in the proximal direction (rearward) by applying an external force.

The temporary fixing urging portion 7 is provided at a position closer to the base end side than the jaw 4, and urges the extension shaft 11 connected to the base end side of the jaw case 3. Specifically, as shown in FIG. 2, a collar 71 integrally provided around the base end portion of the extension shaft 11 and fixed so as to surround the extension shaft 11 and a base end side (rear) of the casing 2. It is a coil spring 72 provided between the component 23 on the side) and the inner wall 231 on the tip side. The coil spring 72 is a push spring and constantly generates a spring force in the extension direction. This spring force is transmitted in the tip direction via the extension shaft 11, and exceeds the resistance force (friction resistance) of the upper oil piston 65, that is, the force required for the upper oil piston 65 to start moving in response to an external force. The force acts on the jaw case 3 as a temporary fixing force F.

By providing the rivet portion 7 for temporary fixing in this way, the rivet portion 7 for temporary fixing moves the jaw case 3 from the tip position to the base end side to the extent that it does not reach the base end position. By applying the stopping force F, as shown in FIG. 3 (b), the jaws 4 (plurality of holding portions 41) are lightened (due to the hydraulic pressure of the drive unit 6, the mandrel M is moved as shown in FIG. 3 (c). Since it is closed (with a lighter force than when it is pulled into the riveter 1), for example, even if the tip of the riveter 1 is turned downward, the rivet R will not fall off from the jaw 4. The rivet R can be held.

In the present embodiment, the temporary fixing urging portion 7 is configured to directly urge the extension shaft 11. In this way, since the temporary fixing urging portion 7 is provided at a position closer to the base end side than the jaw 4, it is advantageous because the transmission path of the spring force generated by the temporary fixing urging portion 7 can be simplified. is there.

The jaw pusher spring 33 provided in the jaw case 3 is also the same as the coil spring 72 in that the jaw case 3 is urged toward the proximal end while the jaw 4 is in contact with the nose piece 5. To do. However, it is sufficient for the jaw pusher spring 33 to generate a spring force for pressing the jaw 4 against the nose piece 5, and the spring force does not exceed the resistance force (friction resistance) of the upper oil piston 65. That is, the coil spring 72 constituting the temporary fixing urging portion 7 in the present embodiment is a spring provided separately from the jaw pusher spring 33, and the purposes and actions of both are completely different.

The push piston portion 8 as the jaw opening means brings the jaw 4 into contact with the nose piece 5 by moving the jaw case 3 to the tip position, thereby opening the jaw 4.

The push piston portion 8 is connected to an air cylinder (second air cylinder 81) into which high-pressure air is introduced from the outside and a jaw case 3, and the jaw case 3 is introduced by introducing high-pressure air into the second air cylinder 81. A piston (second piston 82) that moves to the tip position and a shaft-shaped piston rod (second piston rod 83) that extends from the second piston 82 to the tip side are provided. The tip of the second piston rod 83 is positioned so as to abut the base end of the upper oil piston 65. A part of the second piston rod 83 of the present embodiment is fitted and fixed to the upper oil piston 65.

High-pressure air is introduced to the proximal end side of the second air cylinder 81 with respect to the second piston 82. When the high-pressure air is introduced into the second air cylinder 81, the second piston 82 and the second piston rod 83 move in the tip direction (forward) (see FIG. 2). Along with this, the extension shaft 11 is pushed by the second piston rod 83, so that the jaw case 3 also moves in the tip direction (forward). Along with this, the tip of the jaw 4 comes into contact with the nose piece 5, and the jaw 4 is opened as shown in FIG. 3A. By introducing high-pressure air into the push piston portion 8 in this way, the jaw 4 can be forcibly opened.

Here, in the conventional riveter, the jaw case is always urged to the tip side by the push spring provided inside the riveter, except when a pulling force (hydraulic pressure, etc.) is applied to the mandrel when crimping the rivet. The jaw was in contact with the nosepiece and was in an open state. That is, Joe was always open when no pulling force was applied. On the other hand, in the present embodiment, the jaw 4 can be opened only when the push piston portion 8 is operated. Therefore, by removing the high-pressure air from the push piston portion 8, the temporary fixing urging portion 7 can effectively exert the temporary fixing urging force F on the jaw case 3 and the jaw 4. Further, in the present embodiment, since the push piston portion 8 can be operated by introducing high pressure air, it is advantageous in that the push piston portion 8 can be designed by the same method as a general air tool.

The push piston portion 8 is in a state of being closed to the extent that the jaw 4 can temporarily fix the mandrel M at all times when the drive portion 6 does not operate due to the provision of the temporary fixing biasing portion 7. Therefore, it is provided to forcibly open the jaw 4. Therefore, by operating the push piston portion 8, the work of setting the rivet R on the jaw 4 can be easily performed without receiving resistance from the jaw 4. However, for example, if it is not a problem to attach the mandrel M to the jaw 4 by pushing the mandrel M into the jaw 4 manually by an operator, the push piston portion 8 does not necessarily have to be provided.

Up to this point, one embodiment of the present invention has been taken up and described, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, the temporary fixing urging portion 7 is provided in the casing 2 and is configured to urge the extension shaft 11. However, the present invention is not limited to this configuration.

For example, the temporary fixing urging unit 7 may be configured to urge a member that pressurizes the hydraulic oil in the drive unit 6. Specifically, as another embodiment (No. 1), the coil spring 72 for urging the extension shaft 11 in the above embodiment is not provided, and as shown in FIG. 4, the second in the oil piston portion which is the drive portion 6. A withdrawal shaft 73, which is partially projected below the 1-piston 64 and is provided so as to be able to appear and disappear along the axial direction of the first piston rod 62, and an infestation shaft 73 provided inside the first piston rod 62 and with the infestation shaft 73 downward. It is conceivable to provide an urging coil spring 74. This coil spring is a push spring and emits a spring force in the extension direction. With this configuration, as in the above embodiment, when the upper oil piston 65 is moved toward the tip by introducing high pressure air into the push piston portion 8, downward hydraulic pressure is applied to the oil tank 61, so that the first The piston rod 62 and the first piston 64 move downward. Along with this movement, the haunting shaft 73 moves upward with respect to the first piston rod 62 and is immersed in the first piston 64. As a result, the first piston 64 moves to the lower end in the oil piston portion. Since the first piston rod 62 also moves downward by the length of the immersion shaft 73 in this way, the volume of the oil tank 61 is expanded. With the hydraulic pressure corresponding to the amount of hydraulic oil corresponding to the expanded volume, a temporary fixing force F that moves the jaw case 3 to the proximal end side can be exerted.

Further, as another embodiment (No. 2), as shown in FIG. 5, a space extending in the axial direction is provided in the first piston rod 62 in the oil piston portion which is the drive portion 6, and reciprocating along this space. It is also conceivable to provide a moving small piston 76 and a coil spring 75 for urging the small piston 76. The coil spring 75 is a push spring and generates a spring force in the extension direction. With this configuration, a small amount of hydraulic oil can be pushed out from the inside of the first piston rod 62, and a temporary fixing force F that moves the jaw case 3 to the base end side with hydraulic pressure corresponding to the amount of the hydraulic oil. Can exert.

In the two configurations illustrated in this way, the temporary fixing urging force F can be applied to the jaw case 3 via the hydraulic oil, so that the degree of freedom in arranging the temporary fixing urging portion 7 in the riveter 1 is increased. It is advantageous in that it can be done. It should be noted that various configurations other than those illustrated are possible, and the configuration is not limited to the explicit configuration.

Further, even when the temporary fixing urging portion 7 is provided in the casing 2 as in the above embodiment, for example, the jaw case 3 may be directly urged. That is, the temporary fixing urging portion 7 may be provided at a position closer to the proximal end side than the jaw 4.

Further, the drive unit 6 of the above embodiment is configured as an oil piston unit that pressurizes the hydraulic oil with high-pressure air. However, the present invention is not limited to this, and the driving force may be generated by hydraulic pressure alone or pneumatic pressure alone, or may be an electric configuration in which a motor and a transmission means such as a gear are combined.

1 Riveter 2 Casing 3 Jaw case 4 Jaw 5 Nose piece 6 Drive part 7 Temporary fixing urging part 8 Jaw opening means, push piston part 11 Extension shaft 41 Holding part 62 Member for pressurizing hydraulic oil, 1st piston rod R ( Blind) Rivet M Mandrel F Force, Temporary Fixing Force

Claims (5)

In the riveter used when attaching the blind rivet to the object to be fastened
A tubular casing that extends in one direction,
A jaw case that reciprocates between the tip position and the base end position in the casing,
A jaw provided at the tip of the jaw case and capable of sandwiching the rod-shaped mandrel of the blind rivet in the radial center.
A nose piece provided at the tip of the casing, having a space for inserting the mandrel from the outside to the inside of the casing, and engaging with the jaw on the proximal end side.
A drive unit that generates a driving force for moving the jaw case back and forth,
Temporary fixing urging portion that urges the jaw case toward the base end, and
With
The jaw has a plurality of holding portions for sandwiching the mandrel.
The plurality of sandwiching portions are between an open state in which the mandrel is not sandwiched by expanding in the radial direction and a closed state in which the mandrel is sandwiched by narrowing in the radial direction with the reciprocating movement of the jaw. When the jaw case is in the tip position, the jaw is in the open state by engaging with the nose piece, and when the jaw case is in the base end position, the jaw is in the closed state.
When the drive unit does not operate, the temporary fixing urging unit exerts an urging force on the jaw case to move the jaw case from the tip position to the base end position to the extent that it does not reach the base end position. A riveter characterized by that. Further provided with a jaw opening means for bringing the jaw into the opened state by moving the jaw case to the tip position.
When the driving unit does not operate and the force for moving the jaw case to the tip position by the jaw opening means is released, the temporary fixing urging portion is said to the jaw case. The riveter according to claim 1, wherein an urging force is applied to move the base end side from the tip position to the extent that the base end position is not reached. The jaw opening means includes an air cylinder into which high-pressure air is introduced from the outside, and a piston which is connected to the jaw case and moves the jaw case to the tip position by introducing high-pressure air into the air cylinder. The riveter according to claim 2, wherein the riveter is provided. The riveter according to any one of claims 1 to 3, wherein the temporary fixing urging portion is provided at a position closer to the proximal end side than the jaw. The driving unit generates the driving force by hydraulic pressure,
The riveter according to any one of claims 1 to 3, wherein the temporary fixing urging portion urges a member that pressurizes hydraulic oil in the driving portion.