JP2005007546A - Device for preventing driving of driver without staples - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing driving of a driver without staples, superior in operability, capable of surely locking the operation of a trigger lever, when staples become a prescribed number or less, while reducing the cost and weight. <P>SOLUTION: A lock member 9 having the upper end extending to the vicinity of the trigger lever 5, and having the upper end movable to a first position and a second position for making the operation of the trigger lever 5 possible or impossible, is rotatably supported by a rotary shaft 13 arranged in a magazine 3; and is constituted so that a spring 11 is arranged for energizing the lock member 9 in the direction for moving to the first position, and the lock member 9 is energized in the direction for moving to the second position by a feeder 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial application fields]
The present invention relates to a blanking prevention device for preventing blanking that is not noticed even though the stopper of the driving machine is lost.
[0002]
[Prior art]
An example of a conventional idling prevention device is shown in FIGS. The idling prevention device shown in the figure is proposed by Patent Document 1. An outline of the idling prevention device described in Patent Document 1 will be described below.
The trigger lever 5 is pivotally supported on the housing 4, and an L-shaped lever 16 is rotatably attached to a rotary shaft 13 provided on the upper protruding piece 17 of the magazine 3, so that the trigger lever 5 and the L-shaped lever 16 are interposed. The actuating member 18 is disposed between the first position enabling the operation of the trigger lever 5 and the second position preventing the operation of the trigger lever 5, and one end of the actuating member 18 is connected to the L-shaped lever 16. The protruding portion 19 of the feeder 12 that is provided so as to be engageable with one piece and protruded from the upper surface of the magazine 3 is provided so as to be engageable with the other piece of the L-shaped lever 16, and the number of stops 8 in the magazine 3 is reduced. Sometimes the protrusion 19 is engaged with the L-shaped lever 16 and the L-shaped lever 16 is rotated to move the operating member 18 from the first position to the second position, thereby disabling the operation of the trigger lever 5. Driving action It is intended not to perform.
[0003]
When the trigger lever 5 is prevented from being operated by the actuating member 18, the trigger lever 5 is prevented from being deformed or worn by engagement with the actuating member 18 of the trigger lever 5. 5 was entirely made of metal such as iron such as lost wax.
[Patent Document 1] Japanese Patent No. 3289760 [Problem to be Solved by the Invention]
In the above-described idling prevention device, the L-shaped lever 16 is rotatably attached to the rotating shaft 13 provided on the upper protruding piece 17 of the magazine 3, and the trigger lever 5 is interposed between the trigger lever 5 and the L-shaped lever 16. Since the movable actuating member 18 must be arranged at the first position where the operation of the trigger lever 5 can be performed and the second position where the operation of the trigger lever 5 is prevented, the number of parts increases and the cost becomes high. It was. Further, since the rotation operation of the L-shaped lever 16 has to be converted into the vertical movement of the operating member 18, it is difficult to increase the vertical movement amount compared to the movement amount of the feeder 12. Further, the trigger lever 5 needs to be made of a metal such as iron such as lost wax in order to be able to be locked without being deformed or worn, and thus the weight and cost cannot be reduced.
[0004]
An object of the present invention is to provide an anti-blank device for a driving machine with good operability that can eliminate the above-mentioned drawbacks, realizes low cost and light weight, and can reliably lock the operation of a trigger lever. Is to provide.
[0005]
[Means for Solving the Problems]
The object is to arrange a pivotable locking member on a rotation shaft provided between the trigger and the feeder, and the locking member has a first position enabling the trigger to rotate on the upper tip side and the rotation of the trigger. The feeder is pivotable to a second position to prevent movement, and the feeder comes into contact with the lower end of the lock member when the number of fasteners in the magazine decreases, so that the lock member is moved from the first position to the second position. This is achieved by turning.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 to 8 show an embodiment of the idle driving prevention device of the present invention. The driving machine operates by using compressed air or the like as a power source to drive the driving machine body 1 including a driver 2 that hits the stopper 8, and the stopper 8 is housed in the driving path 15 of the blade guide 6. A magazine 3 having a feeder 12 that presses and urges, a trigger valve 21 that controls the operation of the driver 2, a trigger lever 5 that is pivotally supported by a support shaft 20 of the housing 1, and an inside of the trigger lever 5 And a metal trigger arm 26 that is pivotally supported by the actuator and activates the trigger valve 21. By operating the trigger lever 5 and the trigger arm 26, the driver 2 is driven via the trigger valve 21. The stopper 8 in the driving path 15 is driven out.
[0007]
A lock member 9 pivotally supported by a rotary shaft 13 provided on the side surface of the magazine 3, a spring 11 for urging the lock member 9 counterclockwise, and a stopper 8 as a guide on the blade guide 6 side. The feeder 12 includes a feeder 12 that presses and urges the plate 24 to sequentially feed the stopper 8 into the driving path 15. The spring 11 is positioned substantially at the center of the feeder spring 14 that presses and urges the feeder 12. . The feeder 12 and the feeder spring 14 are accommodated in a hole 3 a in the magazine 3. The lock member 9 is disposed on the side surface of the magazine 3, and is configured such that a distance of a dimension A extends vertically from the contact portion 12a of the feeder 12 to the engagement portion 12a of the trigger lever 5, and the lower end portion 9b is The magazine 3 is configured to be able to enter the hole 3 a of the magazine 3 through the notch 3 b of the magazine 3 and to come into contact with the contact portion 12 a of the feeder 12. The lock member 9 has a shape that can be easily rotated as a flat plate around the rotation shaft 13 on the side surface of the magazine 3, and the upper end portion 9 a extends upward from the upper end portion 9 a and is bent into a substantially L shape. The stop portion 5a and the fixed gap c are configured to be engageable while being rotatable. Since the rotary shaft 13 is positioned so as to be at least a half or more between the upper end portion 9a and the lower end portion 9b of the lock member 9 and toward the lower end portion 9b, the lower end portion 9b of the lock member 9 has moved slightly. It is possible to make the upper tip 9a move greatly only by this. For example, when the rotary shaft 13 is disposed at a position 2/3 of the dimension A between the upper end 9a and the lower end 9b of the lock member 9 as shown in FIG. 2, the lower end 9b is the thickness of the stopper 8. Assuming that it has moved by 1 mm, the upper tip 9a moves 2 mm, twice that amount, and the amount of movement has been amplified. As described above, the movement of the lower end portion 9b can be amplified and transmitted to the movement of the upper end portion 9a depending on where the rotary shaft 13 is disposed between the upper end portion 9a and the lower end portion 9b of the lock member 9. become.
[0008]
Next, the operation will be described with reference to FIGS. As shown in FIGS. 2 to 4, when one or more stoppers 8 remain in the magazine 3, the lock member 9 has the lower end portion 9 a pressed by the spring 11, so that the rotary shaft 13 is supported as a fulcrum. The upper tip 9a is in an initial state where the upper end 9a abuts against the wall 4a of the housing 4 and stops rotating. Therefore, in this state, the locking portion 5a and the upper tip portion 9a of the trigger lever 5 are in the first position pressed to the left with a certain gap c with respect to the locking portion 5a. 5 is in an operable state. Accordingly, as shown in FIGS. 5 to 6, when the trigger lever 5 is pulled with the push lever 22 applied to the material to be driven, the trigger valve 21 is turned on and the driver 2 is lowered to stop in the driving path 15. The tool 8 is driven into the workpiece.
[0009]
Conventionally, the trigger lever 5 is made of a flexible plastic or the like so as to reduce the cost and weight and prevent the finger from getting cold when operated. However, since the engaging portion 5a of the trigger lever 5 is subjected to a strong force when the upper end portion 9a of the lock member 9 is engaged and deforms or wears, the iron plate 10 is attached so as to be surely locked. The plate 10 is disposed in the locking portion 5a, and the plate 10 is fixed to the both ends of the trigger lever 5 by the holes 5b at both ends, and the metal portion of the plate 10 is exposed at the center portion. It is configured to be able to be securely locked to the tip of the.
[0010]
Next, FIGS. 7 to 8 show a state in which the stopper 8 in the magazine 3 is reduced, and shows a state in which the last stopper 8 in the magazine 3 has been hit. Since there is no stopper 8 in the driving path 15, the feeder 12 is pressed by the feeder spring 14 and moves forward to a position where it abuts against the surface of the guide plate 24 on the driving path 15 side. At the same time, the contact portion 12a of the feeder 12 comes into contact with the lower end portion 9b of the lock member 9, and the feeder spring 14 moves the lower end portion 9b against the pressure of the spring 11, so that the lock member 9 supports the rotary shaft 13 as a fulcrum. Rotate clockwise. As a result, the lock member 9 moves from the first position to the second position, so that the upper tip portion 9a engages with the trigger locking portion 5a. Therefore, since the locking portion 5a and the upper tip portion 9a are engaged, the trigger lever 5 becomes inoperable and cannot be driven, and the stopper 8 cannot be driven, that is, the driver 2 is not activated.
[0011]
Compared with the prior art, the anti-blank device configured as described above does not require a mechanism for converting rotational motion to linear motion, and can directly lock the rotational motion, so the components are very Therefore, the number of parts can be minimized. Further, if the position of the engaging portion 5a for preventing the rotation of the trigger lever 5 is provided in the vicinity of the operation position of the trigger lever 5, and if the rotation shaft 13 which is the distance between the fulcrum action points of the lock member 9 is changed, one is changed. Even in the case of the stopper 8 having a thin contact thickness, the slight movement of the feeder 12 can be amplified and transmitted to the amount of movement of the upper end portion 9a of the lock member 9, so that the operation of the trigger lever 5 is surely prevented. Then, it is possible to prevent the driving operation.
[0012]
Further, the trigger lever 5 can be made entirely of plastic by inserting the plate 10 into the hole 5b and using only the locking portion 5a as a metal, further reducing the cost and weight, and further deforming / wearing, etc. It is possible to surely prevent malfunction due to.
[0013]
In the embodiment described above, the engaging portion 5a disposed on the upper portion of the trigger lever 5 is configured to engage with the upper tip portion 9a of the lock member 9, but the present invention is not limited to this, and the upper tip of the lock member 9 is formed. You may make it engage with the inner wall of the trigger lever 5 to operate as L shape. For example, as shown in FIGS. 9 to 10, the L-shaped portion 9 c of the lock member 9 is normally urged to the first position where the trigger lever 5 can be operated by retracting from the inner wall 5 c of the trigger 5. When the feeder 12 advances to a predetermined position in the magazine 3, the feeder 12 comes into contact with the lower end portion 9 b of the lock member 9, and the lock member 9 is pressed and biased against the spring 11 to rotate. Then, the L-shaped portion 9c may be rotated to the second position where the L-shaped portion 9c engages with the inner wall 5c of the trigger lever 5 to prevent the operation of the trigger lever 5.
[0014]
【The invention's effect】
According to the present invention, the lock member is rotatably disposed on the rotation shaft provided between the trigger lever and the feeder, and the upper end of the lock member is disposed in the vicinity of the trigger lever so that the trigger lever can be operated. The first position and the second position that prevents the trigger lever from operating, and the feeder presses and urges the lower end of the lock member when the number of fasteners in the magazine is reduced. Since the trigger lever is prevented from being operated by rotating it from the first position to the second position, the number of parts can be reduced compared to the prior art, and the cost can be reduced. Become.
[0015]
Further, the movement of the upper end portion of the lock member for preventing the operation of the trigger lever by the lock member does not require conversion of the rotational movement into a vertical movement that is a straight line unlike the prior art. Since it can be used for the amount of movement for preventing the operation of the lever, it is possible to reduce the movement loss and make the configuration compact.
[0016]
In addition, the trigger latching part that prevents the trigger lever operation and the upper end of the lock member are located in the vicinity of the trigger lever operation position, and the lower end part is extended to the vicinity of the feeder located substantially at the center of the magazine. By changing the rotation axis, the distance between the fulcrum action points can also be changed. For this reason, even when the last one is finished with a thin stopper, the movement amount of the feeder can be amplified on the upper tip side, so the amount of the trigger lever is increased. Therefore, it is possible to reliably prevent rotation and prevent driving. Furthermore, it is possible to make almost the entire plastic except for the locking part of the trigger lever, and to provide a device for preventing the empty shot of the driving machine that can further reduce the cost and weight, and prevent erroneous operation due to deformation, wear, etc. become.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a driving machine according to the present invention.
2 is a longitudinal sectional view of a main part of FIG.
3 is a partially enlarged cross-sectional view showing a state where it can be operated around the trigger lever of FIG. 1;
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is an explanatory longitudinal sectional view showing a state in which a trigger lever is operated from the state of FIG. 2;
6 is an enlarged view around the trigger lever of FIG. 5;
FIG. 7 is an explanatory longitudinal sectional view showing a state in which a lock member is in a second position.
FIG. 8 is an enlarged view around the trigger lever of FIG. 7;
FIG. 9 is a longitudinal sectional view of a main part showing a state in which a trigger lever can be operated in another embodiment of the present invention.
FIG. 10 is an explanatory longitudinal sectional view showing a state in which the lock member is in the second position from FIG. 9;
FIG. 11 is an enlarged view of a main part showing an example of a conventional idling prevention device for a driving machine.
12 is an enlarged view of a main part showing a state in which the number of fasteners in the magazine is reduced from FIG. 11. FIG.
[Explanation of symbols]
1 is a driving machine body, 2 is a driver, 3 is a magazine, 4 is a housing, 5 is a trigger lever, 5a is an engaging portion, 7 is a launching portion, 8 is a stopper, 9 is a locking member, and 9a is an upper tip. 9b is a lower end, 11 is a spring, 12 is a feeder, 13 is a rotating shaft, and 15 is a driving path.

Claims (1)

A magazine with a feeder that stores the stopper and presses and urges it into the driving path of the driving portion, a driver that moves up and down in the driving path to drive the stopper in the driving path, and a trigger for driving the driver In a driving machine including a valve and a trigger lever that is pivotally supported by a support shaft of a housing and is operable to control the operation of the trigger valve.
The lock member is rotatably supported on a rotation shaft provided in the magazine, with a lock member movable at a first position and a second position at which the upper end extends in the vicinity of the trigger lever and the upper end enables and disables operation of the trigger lever. A device for preventing idling of a driving machine characterized in that a spring is provided for urging the member in the direction of moving to the first position and the lock member is urged by a feeder in the direction of moving to the second position.

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