JPS6033631B2 - automatic screwdriver device - Google Patents

Description

[Detailed Description of the Invention] The present invention supplies one fastener component consisting of a head and a screw or bolt from a parts supply device with the leg first, and holds this with the tip of a screwdriver. This machine for tightening fastener parts to a workpiece is particularly concerned with a driver bit that engages with the fastener part and has a polygonal head of ten or one groove or a square or hexagon, which is driven in a circular motion by a circular drive source, and this driver. A chuck unit consisting of a nose having a guide hole for rotatably and reciprocatingly guiding the bit, and a pair of jaws pivotably supported to open and close the tips of the guide holes facing each other. In an automatic screwdriver device for tightening a fastener part held in the jaws onto a workpiece using the driver bit, the automatic screwdriver device is configured to securely hold the fastener parts in the jaws with the legs first without falling during operation. This invention relates to a driver device.

Previously known such automatic screwdriver devices include, for example, US Pat. This head is provided with a trigger means that can freely slide back and forth along the head, and when the tip of the trigger means comes into contact with the workpiece, the cam of the trigger means is withdrawn from the rear end of the jaw, and the jaw This makes it possible to open up the world.

However, since a cam that prevents the opening of the jaws is integrally provided with the trigger means that hits the workpiece, if the workpiece is made of relatively rutted material, the tip of the trigger means may make an impression on the workpiece, or the jaw The trigger means that allows the jaw to be opened may not operate sufficiently due to being thrown into the workpiece, and the jaw may be damaged as it attempts to forcefully open the jaw. Furthermore, since the tip of the screwdriver is relatively large, the screwdriver tip cannot fit into the recess of the workpiece, which would be possible with a normal automatic screwdriver, making it impossible to tighten screws. There are other problems. In order to solve this problem, the applicant proposed
The application was filed for a fastener component holding device for an automatic screwdriver shown in .

That is, this uses the relative movement between the inner cylinder and the outer cylinder of the automatic screwdriver to insert a locking member between the rear inner surface of the jaw and the side surface of the nose to prevent the tip of the jaw from expanding. Alternatively, the locking member can be released from this space to allow the jaws to expand. However, since this is a structure in which the locking member is operated according to the timing of relative movement with the inner cylinder, the automatic screwdriver has a relatively large shape, and many parts are required and the structure is complicated. . The present invention has been devised for the purpose of solving these problems and achieving a simple structure and reliable operation.Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an automatic screwdriver using the present invention. Reference numeral 1 denotes a screwdriver body containing a rotary drive source (not shown) that acts to connect a screw to a workpiece (not shown).

Reference numeral 2a is a trigger provided on the grip portion 2 to turn on/off a start signal to the rotational drive source.

Reference numeral 4 denotes an outer cylinder t fixed to the driver main body 1. 5 is an inner cylinder which is movable relative to the outer cylinder 4 and has a nose 10 constituting the chuck unit A fixed at its tip.

As shown in FIG. 2, the nose 10i is rotatably supported by a supply pipe 13 whose tip reaches a guide hole 11 drilled on this center line. 1
1, and a screw from a component supply device (not shown) is guided through the guide hole 111. This supply pipe 13 is configured to swing about a support shaft 14 in the middle due to the reciprocating movement of the driver bit 38 which is rotated by the rotational drive source.
Furthermore, the nose turtle 81 has a pair of jaws 20 facing each other with the supply pipe 13 in between, as shown in FIGS. 3 and 4, which are pivotably supported. A holding hole 21 is formed into which the leg portion of the screw 30 can be loosely inserted.

An operation rod 22 is screwed into the rear end of each jaw 20 and passes through a communication hole 12 formed in the side wall of the nose 10, and the length of the operation rod 22 is adjusted with a nut 23. . The tip of this operating rod 22 has a spherical surface. Further, the screw 3 passes through the supply pipe 13 at the tip of the jaw 20 and the jaw 20
Blocking pawls 25 that grip the leg portions of the screws 3 to prevent backflow of the screws 3 when the screws are supplied are respectively attached to be swingable around pawl pins 26. This blocking pawl 25 has a plate spring 27 so that its tip protrudes inward from the window 24 of the jaw 25.
Yes, it is always biased by a spring body such as a spring, and the inward protrusion of the blocking claw 25 is determined by the wall surface of the window 24 of the jaw 20, and the protruding mechanism of the blocking claw 25 is a claw pin. It is located in front of position 26. The protruding end of the blocking pawl 25 is formed with a tooth profile that engages with the leg portion of the screw 3. Furthermore, the guide hole 11 has a stepped hole shape with a large diameter portion and a flanged portion,
The tip of the driver bit 30' is connected to this guide hole 11.
It has an enormous cylindrical part 31 that can rotate and slide reciprocatingly in the large cylindrical part.

A conical portion 32 is formed at the rear end of this large cylindrical portion 31 and tapers toward the rear of the driver bit 38.
The tip has a hole that can be engaged with the head of a screw 3 having a hexagonal neck used in this embodiment. Huge cylindrical part 31
The tip of the operating rod 22 is normally in close contact with the peripheral surface of the
These prevent the tips of the jaws 20 from expanding. The length of this large cylindrical portion 31 is such that when the driver bit 30 advances against the nose 01 and the tip engagement hole 33 engages with the head of the screw 3 held by the front jaw 201, the length of the jaw 20 is determined. The tip of the operating rod 22 is adjusted in advance so that it comes off the enlarged cylindrical portion 31 and the jaws 20 can be expanded. Next, the operation of this embodiment will be explained.

When a screw 3 destined for one piece passes through the supply pipe 13 and is supplied with the legs first from the parts supply device of the pair of jaws, the screw 3
is held in the holding hole 21 with the legs first as shown in FIG. At this time, the blocking claw 25 is once pushed away by the screw 3, but the blocking claw 25
grip by pressing the legs together. This pressing operation increases the backflow preventing effect in proportion to the backflow preventing effect of the screw 3, so that the screw 3 is reliably held without backflow. In this state, bring the tip of the automatic screwdriver close to the workpiece, use the tip of the leg of screw 3 to find the tightening hole position on the workpiece, match this hole position with the tip of the leg of screw 3, and then push the driver into the workpiece. When attached, the nose 10 is prevented from advancing through the screw 3 and the jaw 20, and the inner cylinder 5 and outer cylinder 4 move relative to each other, and the driver bit 3 moves forward inside the guide hole 11 of the nose 10, so the jaw 10 is prevented from moving forward. The operating rod 22 of -20 is detached from the enlarged cylindrical portion 31 of the bit 30, and the jaws 20' can be expanded. On the other hand, the supply pipe 13 is pushed away from the bit 30'. During this forward movement, when the operator operates the trigger and receives a start signal from the rotational drive source, the driver bit 30' rotates until it reaches the head of the screw 3, and the engagement hole 33 of the bit 30 is inserted into the screw 3.
engages the head of the

For this reason, the screw 3 and the bit 30 move forward while being engaged, and the pair of jaws are widened to the extent that the screw 3 is tightened to the workpiece. After completing the tightening work of the screw 3 in this way, when the rotary drive source is stopped and the automatic screwdriver is moved backward, the outer cylinder 4 and the inner cylinder 5 return to the state before the tightening work, and the bit 30 also returns to its original position. 3, and the operating rod 22 at the rear end of the pair of jaws 20 moves again to the large cylindrical part 31 of the bit 30, so the tips of the pair of jaws 20 are closed again as shown in FIG. 3, and the next screw 3 is held. becomes possible. Furthermore, FIGS. 5 and 6 show another embodiment of the present invention, in which a ball 40 whose part protrudes inwardly into the communicating hole 12a of the nose 10 is used instead of the operating rod 22 having a spherical tip. If the operating rod 22a attached to the rear end of the jaw 20 with a nut 23a whose length can be adjusted freely is in constant contact with the ball 40, the same effect can be achieved. 38 slides smoothly.

Incidentally, the four balls may be rotatably held at the tip of the operating rod 22a. Also, the blocking claw 25 at the tip of the jaw 20
A coil spring 28 is used in place of the plate spring 27 of the previous embodiment, and the protruding end of the blocking claw 25a is sharp.

Furthermore, FIG. 7 shows another embodiment, in which a driver bit 30a is used for a screw 3a having a ten-groove head instead of the screw 3 of the previous embodiment.

This also has the same effect if the enlarged cylindrical portion 31a is formed in the same manner. As explained above, the present invention has the tip of the driver bit formed by an enormous cylindrical part and a conical part, and a pair of jaws movably attached to the /-z.
An operating rod is attached to the jaw, and one end of the rod is placed in direct or indirect contact with the large cylindrical portion, and the tip of the jaw is closed. This allows the driver bit to descend until the operating rod reaches the conical portion. The jaws are in a closed position, which not only ensures that the leg of the bolt is screwed into place on the workpiece in an upright position, but also ensures that the driver bit mates with the head of the bolt. This has the advantage of allowing reliable fastening.

Furthermore, since the present invention is configured so that the jaw opening/closing motion is applied directly from the driver bit, no extra components are required, and an inexpensive device with a simple structure and a small number of parts can be provided. There are advantages. Furthermore, in the present invention, since the position of the tip of the operating lever on the jaw can be adjusted freely, the opening amount of the jaw can be adjusted arbitrarily, and the timing at which the jaw separates from the bolt can be arbitrarily adjusted depending on the bolt. There are advantages such as being able to Furthermore, since the present invention has a configuration in which the pair of jaws are operated by the reciprocating movement of the driver bit, the tying operation is stabilized and reliability is improved. Moreover, since a conical surface is formed at the rear end of the large cylindrical part and it is made to slide through a ball, the operating rod can smoothly move over the driver bit, allowing the jaw to operate accurately. It has remarkable effects and is extremely easy to use.

[Brief explanation of the drawing]

Fig. 1 is an external view of an automatic driver using the present invention, Fig. 2 is an enlarged cross-sectional front view of essential parts showing an embodiment of the present invention, Fig. 3 is a cross-sectional view taken along line mm in Fig. 2, FIG. 4 is a sectional view similar to FIG. 3 showing a screw holding state, and FIGS. 5 and 6 are main part sectional views showing other embodiments. FIG. 7 is a sectional view of a main part showing another embodiment. A is the chuck unit; 1 is the driver body, 2 is the grip, 2a is the trigger, 3, 3a are the screws, 4 is the outer cylinder,
5 is the inner cylinder, 10 is the nose, 11 is the guide hole, 12, '2a
13 is a connecting hole, 14 is a supporting shaft, 20' is a jaw, 21 is a holding hole, 22, 22a is an operating lever, 23, 23
a is a nut, 24 is a window, 25, 25a is a blocking claw, 26
is a claw pin, 27 is a leaf spring, 28 is a coil', 30,
30a is a driver bit, 31 and 31a are large cylindrical parts, 32 is a conical part, 33 is an engagement hole, and 40 is a ball. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. Driver bit 3 that is rotationally driven by a rotational drive source.
0 is arranged so as to be able to reciprocate within the guide hole 11 of the nose 10, and a pair of jaws 20 are arranged in the nose 10 so as to be able to swing freely, and the fastener parts held by the jaws 20 are driven into the work by the driver bit 30. In the automatic screwdriver device for tightening, an enormous cylindrical portion 31 and a conical portion 32 continuous thereto are formed at the tip of the driver bit 30, and a communication hole 12 is bored at a position corresponding to the rear part of the jaw 20 of the nose 10, This communication hole 12 is communicated with the guide hole 11 of the nose 10, and the
An operating rod 22 is attached to the rear of the guide hole 1, and the operating rod 22 is inserted directly from the communication hole 12 or through the ball 40 into the guide hole 1.
1. An automatic screwdriver device characterized in that the screwdriver device is arranged such that it enters into the screwdriver bit 1 and is positioned so that one end of the screwdriver bit comes into contact with the enlarged cylindrical portion 31 of the screwdriver bit 30 to urge the tip of the jaw 20 to close. 2. A driver bit 30, which is rotationally driven by a rotational drive source, is arranged so as to be able to reciprocate within the guide hole 11 of the nose 10, and a pair of jaws 20 are arranged in the nose 10 so as to be swingable. In an automatic driver device for tightening a fastener part onto a workpiece using the driver bit 30, the driver bit 30
A large cylindrical part 31 and a conical part 32 continuous thereto are formed at the tip of the nose 10, and a communication hole 12 is bored at a position corresponding to the rear part of the jaw 20 of the nose 10, and this communication hole 12 is used to guide the nose 10. The operating rod 22 is connected to the hole 11 and is screwed to the rear of the jaw 20 so that its position can be freely adjusted. An automatic screwdriver device characterized in that it is disposed so as to advance into the hole 11, and one end thereof is brought into contact with the enlarged cylindrical portion 31 of the driver bit 30 to urge the tip of the jaw 20 to close.