JPS605427B2 - Automatic screwdriver fastener component holding device - Google Patents

Description

[Detailed Description of the Invention] The present invention involves feeding one fastener component consisting of a head and a leg using a screw or bolt from a component supply device with the leg first. This invention relates to a fastener part holding device for reliably holding a fastener part without tipping over during tightening work in an automatic driver that holds and tightens the fastener part to a workpiece.

An example of such automatic drivers that have been widely used in the past is the one described in Japanese Patent Publication No. 47-40039.

In this system, a screw supplied from a parts supply device is held with the legs first by a pair of jaws placed opposite each other, and then attached to a workpiece using an automatic screwdriver. When using this to tighten a screw to a workpiece, the position of the tightening hole in the workpiece must match the center line of the driver. However, in general, when an operator holds a screwdriver and tightens a screw into a workpiece, in order to match the center line of the driver with the tightening hole position of the workpiece, the operator searches for this hole position using the leg of the screw held in the jaw of the screwdriver. Currently, the screws are installed vertically. This causes the screws to be tilted when searching for holes.
Alternatively, the jaws may open and the screw may pop out and fall over, making it unstable to align the center lines of the screwdriver, the screw, and the hole in the workpiece, making it impossible to perform accurate tightening work, resulting in extremely poor workability. Also, Miseki Showa 54-101697
There is also a device as shown in the above-mentioned publication, but this also has the same problem as the above-mentioned known example because it is simply held by jaws that face each other. The present invention has focused on such problems and has been devised for the purpose of preventing the jaws that hold the fastener parts from expanding when searching for the position of the attaching hole in the workpiece, and allowing the jaws to expand during the sewing work. An embodiment of the present invention will be described below based on the drawings.

Figures 1 and 2 show an automatic screwdriver using the present invention, and 1 is a screwdriver body that has a built-in rotary drive source (not shown) that acts to attach a screw 2 to a work piece 6. be.

An outer cylinder 3 is fixed to the driver main body 1, and an inner cylinder 4, which is movable relative to the outer cylinder 3, is inserted into the outer cylinder 3 so as to be slidable back and forth. A nose 10 is attached to the tip of this inner cylinder 4. As shown in FIGS. 3 and 4, a drive shaft 5 is provided on the center line inside the inner cylinder 4 and is rotatable by the rotational drive source. It reaches approximately the center of the provided guide hole 10a, and a fitting hole 5a is formed at the tip so that it can be fitted with the head of the screw 2, that is, in this embodiment, a hexagonal fitting hole 5a. The tip of the nose 101 is Y in the guide hole 10a.
A supply pipe 11 that intersects in a shape is pivotally supported via a support pin 12 so as to be able to swing freely, and one component is supplied with pressurized air from a component supply device (not shown) to the rear end of this supply pipe 11. A supply hose 13 is connected, through which the threaded screw 2 passes.
In FIG. 3, the tip of this supply pipe 11 is the guide hole 10a.
It is constantly biased by a pipe action spring 14 so as to support the inner surface of the pipe. Furthermore, a pair of jaws 20 facing each other symmetrically with respect to the center line of the driver are supported across the supply pipe 11 so as to be swingable about jaw screws 21. Madu Jaw Spring 2
2, the tip is always urged to be closed.

A holding portion 23 for holding one screw 2 fed from the component supply device is formed at the tips of the pair of jaws 20, and a holding portion 23 is formed from a semicircular groove formed at each tip. The leg portion of the screw 2 is configured to protrude from the hole 20a. Also, these pair of jaws 20 are fed with screws 2.
Each of the screws 2 has a built-in check pawl 24 whose tip is close to the top surface of the head of the screw 2 to prevent the backflow of the screws, and the check pawl 24 can swing freely around a pawl pin 25. The non-return claw spring 26 is constantly biased so that the tip protrudes toward the center line within the holding portion 23. Furthermore, as shown in FIGS. 3 to 8, a side surface 10b at the approximate center of the nose 10 has a cross section so that iron can be inserted between this side surface 10b and the rear inner surface 20b of the jaw 20 that faces this side surface 10b. An inverted L-shaped locking member 30 having a wedge portion 30a formed with a wedge-shaped slope at one end is provided. In between, the guide groove 32 is slidable back and forth along a guide groove 32 formed in a direction parallel to the jaw screw 20 that swingably supports the pair of jaws 20.

This lock section 30 is provided corresponding to the two jaws of the pair. Further, as shown in FIG. 5, a lock spring 33 is provided between the end surface of the lock member 30 and the bottom surface 10c of the concave portion of the nose 10 facing thereto, which constantly biases the lock member downward.
are respectively disposed, and this locking member 30 normally prevents the ends of the pair of jaws 20 from engaging with each other. This lock member 3
A circular arc surface 30b is formed at the other end of the nose 10, and an opening/closing swing surface extension of the pair of jaws 20 is attached to the circular arc surface 30b via a support pin 42 to a support flock 41 fixed to the rear lower surface of the nose 10. This is a configuration in which a T-shaped lever 40 that is movable on a plane perpendicular to the top acts. The rear end of this lever 40 has a protrusion 40a that protrudes toward the inner cylinder 4.
are in contact with each other, and screw 2 with a screwdriver into this protrusion.
When the outer cylinder 3 moves forward with respect to the inner cylinder 4 during the tightening operation, a slope is formed to make it easier for the outer cylinder 3 to ride on the outer peripheral surface of the outer cylinder 3. In addition, the workpiece 60 and Jiyo 2 are on the nose 10.
0 and set a certain distance between the workpiece 6 and the jaw 20.
In order to prevent the tips of the contact portions 50 from coming into contact with each other,
a is the blocking member 5 provided immediately before the holding portion 23 of the jaw 20;
0 is attached, and this support portion 50a perpendicularly intersects the center line of the guide hole 10a of the nose 10. An arcuate notch 50b having a diameter larger than the head of the screw 2 is formed in this saddle portion 50a. Next, the operation of this embodiment will be explained.

As shown in FIGS. 3 and 4, one screw 2 is fed from a parts supply device (not shown) via a supply hose 13 and a supply pipe 11 with the legs first using compressed air. Then, the screw 2 passes through the non-return claw 24 which is also built into the pair of jaws 20 and whose tip protrudes into the holding part 23, and is held by the holding part 23 of the jaws 20. At this time, this pair of Joe 2M
The rear inner surface 20b of the jaw 20 and the side surface 1 of the nose 10
Since the wedge portion 30a of the locking member 30 is filled with iron between the locking member 30 and the locking member 30b, expansion of the tip is prevented and the screw 2 is held without wobbling. In this state, bring the tip of the screwdriver close to the workpiece 60 and use the tip of the leg of screw 2 to locate the tightening hole position in the workpiece 60. After matching this hole position with the tip of the leg of screw 2, When the start signal of the rotational drive source is input at the same time as the workpiece 601 is pressed,
As shown in FIG. 6, the nose 10 and the inner section 4 are prevented from moving forward as the support portion 50a of the blocking member 50 comes into contact with the workpiece 60, but the outer cylinder 3 slides on the outer peripheral surface of the inner cylinder 4. In order to move forward, the drive shaft 5 moves forward within the guide hole 10a of the nose 10. During this forward movement, the drive shaft 5 pushes away the supply pipe 11 whose tip reaches the guide hole 10a, and the drive shaft 5 reaches the head of the screw 2 while rotating. compete with.

In this way, when the drive shaft 5 presses the head of the screw 2, the protrusion 40a of the lever 40 rides on the outer circumferential surface of the outer cylinder 3, so that the lock member 30 is guided against the lock spring 33 by the lever 4. Move the groove 32 to the nose 1
Since the wedge portion 30b of the locking member 30 escapes from between the side surface 10b of the jaw 20 and the inner surface 20b of the jaw 20, the tip of the jaw 2 can be expanded, and the screw 2 and the drive shaft 5
As a result, the pair of jaws 20 are expanded, and the screw 2 is attached to the workpiece 601 as shown in FIG. After the screw 2 has been tightened in this manner, when the driver is moved backward, the inner cylinder 4 and outer cylinder 3 will return to the state before the tightening operation, and the drive shaft 5 will also return to its original position, allowing the pair of jaws to return to their original positions. The tip of the second river is again closed by a jaw spring 22, and the supply pipe 11 is also closed by a guide hole 10 as shown in FIG.
The tip abuts against the inner surface of a, and the holding portion 23 and the supply pipe 11 return to a state where they are connected. Furthermore, the protrusion 40a of the lever 40
Since the lock part 3 is removed from the outer cylinder 3 and moved onto the inner cylinder 4, the wedge part 30a is inserted between the rear inner surface 20b of the jaw 28 and the side surface 10b of the nose 10 again by the lock spring 33. This prevents the pair of jaws 20 from expanding, making it possible to hold the next screw 2. In this embodiment, the locking member 30 is inserted into the guide groove 32 so as to be able to move back and forth.
Although the lever 40 and the lock spring 33 are used to move the inside of the guide groove 32, in other embodiments, for example, the lock member is swingably attached to the side surface 10b of the nose 10, and the lever 40 moves the lock member. Instead of the reciprocating motion, the wedge portion 30a may be iron-inserted between the side surface 10b of the nose 0 and the rear inner surface 20b of the jaw 20 by a swinging motion.

As is clear from the embodiments described above, the present invention is capable of rotating and reciprocatingly slides a drive shaft 5 that is rotatable by a rotational drive source and has a matching hole 5a that is aligned with the head of a fastener component such as a screw 2 or a bolt. Guide groove 10a that guides freely
are formed on the center line of the nose 10, and the jaws 20, which are symmetrically opposed to each other across the center line of the guide groove 10a of the nose 10 and are swingable via jaw screws 21, are supported by the nose 1. A jaw spring 22 is disposed that is always biased to close the tips of the pair of jaws 20, and furthermore, when the fastener component is held at the tips of the jaws 20, the jaw spring 22 faces the side surface 10b of the nose 10. It is carried between the rear inner surface 20b of the jaw 20 to prevent the tip of the jaw 20 from expanding, and during tightening work, the side surface 10b of the nose 10 and the rear inner surface 2 of the jaw 20 are
0b and the locking member 30 having a wedge portion 30a that allows the distal ends of the pair of jaws 20 to expand is inserted between the side surface of the nose 10 and the guide plate 31 fixed to this side surface. The locking member 30 is provided so as to be slidable back and forth in a guide groove 32 formed in a direction parallel to the jaw screw 21 that pivotally supports the locking member 30.
A lock spring 33 is disposed between the end face of the lock member 30 and the opposing bottom face 10c of the recessed part of the nose 10, and the lock spring 33 is always biased to fit between the inner surface 20b of the jaw 20 and the inner surface 20b of the jaw 20. A support block 41 has a T-shaped lever 40 which is movably supported and whose tip acts to move the locking member 30 against the locking spring 33 during the tightening operation, and has a T-shaped lever 40 fixed approximately at the center of the nose. It is configured to be pivotally supported via. With the above configuration, the fastener part is always held correctly in relation to the center line of the driver, and there is no possibility that the fastener part will slip out of the jaw and fall over while searching for the tightening hole position of the workpiece with the tip of the leg of the fastener part. , no more tilting.

In addition, before the attachment process, the jaws that hold the fastener parts are completely prevented from opening, so even if some external force is applied to the legs protruding from the tips of the jaws, the fastener parts will not tilt. There is no. In addition, the fastener part is held on the center line of the driver until the tip of the fastener part contacts the workpiece and the drive shaft presses the head of the fastener part, so the fastener part does not wobble and is completely tightened when starting the pinning process. The workability of tightening work is greatly improved. Furthermore, the support pin 12 is placed on a plane perpendicular to the opening/closing swing plane of the pair of jaws 20.
The rear end is connected to a supply hose 13 connected to a component supply device, and the tip is connected to the inner surface of the guide hole 10a of the nose 10 so as to be connected to the holding part 23 of the pair of jaws 20. A supply pipe 11 is provided which is always biased so as to be in contact with the guide hole 1 when tightening the screw 2.
Since the tip of the supply pipe 11 is pushed away by the drive shaft 5 from 0a, the guide hole i
Compared to the case where a supply hole that intersects the oa is formed in the nose and there is an intersection part due to these holes, there is no intersection part, so even fastener parts whose leg length is relatively short compared to the head diameter can be easily attached to the leg part without falling over. This has remarkable effects such as being able to reliably feed the paper to the holding portion of the jaw first.

[Brief explanation of the drawing]

FIG. 1 is a front view of an automatic driver showing an embodiment of the present invention, FIG. 2 is a plan view of the main part of FIG. 1, FIG. Figure 4 is a cross-sectional front view of the main part taken along line N-W in Figure 3, Figure 5 is a cross-sectional side view taken along line V-V in Figure 3; Fig. 7 is an enlarged partial cross-sectional plan view showing the end of the tightening work, and Fig. 8 is a cross-sectional side view taken along the skin line in Fig. 6. 1 is the driver body, 2 is the screw, 3 is the outer cylinder, 4 is the inner cylinder,
5 is the drive shaft, 5a is the competition hole, 101 is the nose, 10
a is the guide hole, 10b is the side surface, and 10c is the bottom surface of the recess.
1 is the supply pipe, 12 is the support pin, 13 is the supply hose, 1
4 is a tube action spring, 20' is a jaw, 20a is a holding hole, 20b is an inner surface, 21 is a jaw screw, 22 is a jaw spring, 23 is a holding part, 24 is a non-return claw, 25 is a claw pin, 26 is a reverse Retaining pawl spring, 30, locking part village, 30
a is a wedge portion, 30b is an arcuate surface, 31 is a guide plate, 32 is a guide groove, 33 is a lock spring, 4-way bar, 40a is a protrusion, 41 is a support block, 42 is a support pin, 50 is a blocking member, 50a is the saddle portion, 50b is the notch, and 60 is the workpiece. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. In an automatic driver that feeds one fastener part from a parts supply device with its legs first, holds it at the tip of the driver, and tightens this fastener part to a workpiece 60, the fastener part is rotated. A guide hole 10a that rotatably and reciprocally guides the drive shaft 5 that is rotatable by a drive source.
A nose 10 having a shape formed therein and a guide hole 1 of this nose 10
A pair of jaws 20 are symmetrically opposed to each other across the center line of 0a and are pivotally supported on the nose 10 via a jaw screw 21, and are constantly energized so as to close the tips of the pair of jaws 20. When holding the fastener component at the tip of the jaws 20, the spring 22 is inserted between the side surface 10b of the nose 10 and the rear inner surface 20b of the jaws 20 facing the side surface 10b, and the spring 22 is inserted between the pair of jaws 20. In addition to preventing the tip from expanding, the side surface 10b of the nose 10 and the rear inner surface 2 of the jaw 20 are used during tightening work.
A lock member 30 that escapes from between the nose 10 and the jaws 20 to allow the tips of the pair of jaws 20 to expand; and a lock spring 33 that urges the lock member 30 to always fit between the nose 10 and the jaws 20. A pair of jaws 20 are pivotally supported at the rear of the nose 10 so as to be swingable in a direction parallel to the jaw screws 21, and act to move the lock member 30 against the lock spring 33 during the tightening operation. A fastener component holding device comprising: a lever 40 for holding a fastener; 2. The jaw has a built-in check claw 24 whose tip always protrudes inward and is biased by a check claw spring 26 so that the tip approaches the top surface of the head of the fastener component held by the jaw 20. A fastener component holding device according to claim 1, characterized in that: 3 The locking member is attached to the side surface 10b of the nose 10 and this side surface 1.
The guide plate 31 fixed to the guide plate 31 is capable of sliding back and forth along each guide groove 32 formed in a direction parallel to the jaw screws 21 that pivotally support the pair of jaws 20. A fastener component holding device according to scope 1. 4 The lock part is swingably attached to the side surface 10b of the nose 10, and the wedge portion 30a is attached to the side surface 10b of the nose 10.
and the rear inner surface 20b of the jaw 20.
Fastener component holding device as described in Section 1. 5. Claims 1 and 2, characterized in that the lock spring is disposed between the end surface of the lock member 20 and the bottom surface 10c of the recess of the nose 10 facing thereto.
The fastener component holding device according to item 3 or 4. 6. The fastener component holding device according to claim 1, 2, 3, 4, or 5, wherein the lever is T-shaped. 7 In an automatic driver that feeds one fastener part from a parts supply device with the legs first, holds it at the tip of the driver, and tightens this fastener part to the workpiece 60, the fastener part is rotatable by a rotary drive source. Drive axis 5
a nose 10 formed with a guide hole 10a for rotating and reciprocally slidingly guiding the nose 10;
A pair of jaws 20 are symmetrically opposed to each other across the center line of the nose 10, and are pivotably supported on the nose 10 via a jaw screw 21, and are constantly energized so as to close the tips of the pair of jaws 20. When holding the fastener component at the tip of the jaws 20, the spring 22 is inserted between the side surface 10b of the nose 10 and the rear inner surface 20b of the jaws 20 facing the side surface 10b, and the spring 22 is inserted between the pair of jaws 20. In addition to preventing the tip from expanding, the side surface 10b of the nose 10 and the rear inner surface 20 of the jaw 20 are used during tightening work.
a lock member 30 that escapes from between the nose 10 and the jaws 20 to allow the distal ends of the pair of jaws 20 to expand; and a lock spring 33 that urges the lock member 30 to always fit between the nose 10 and the jaws 20. A pair of jaws 20 are pivotally supported at the rear of the nose 10 so as to be swingable in a direction parallel to the jaw screws 21, and act to move the lock member 30 against the lock spring 33 during the tightening operation. A supply hose 13 is attached to the nose 10 and is swingable about a support pin 12 on a plane perpendicular to the opening/closing swing plane of the pair of jaws 20, and whose rear end is connected to a parts supply device. 1. A fastener component holding device comprising a supply pipe 11 which is connected to a supply pipe 11 and is constantly biased so that its tip abuts against the inner surface of a guide hole 10a of a nose 10. 8 Jyo has a built-in check pawl 24 whose tip always protrudes inward and is biased by a check pawl spring 26 so that the tip approaches the top surface of the head of the fastener component held by Jyo 20. 8. A fastener component holding device according to claim 7. 9 The locking member is the side surface 10b of the nose 10 and this side surface 1.
The guide plate 31 fixed to the guide plate 31 is capable of sliding back and forth along each guide groove 32 formed in a direction parallel to the jaw screws 20 that pivotally support the pair of jaws 20. The fastener component holding device according to item 7 or 8. 10 The locking member is swingably attached to the side surface of the nose 10, and the wedge portion 30a is configured to be fitable between the side surface 10b of the nose 10 and the rear inner surface 20b of the jaw 20. The fastener component holding device according to item 7 or 8. 11. The lock spring is disposed between the end surface of the lock member 20 and the bottom surface 10c of the recess of the nose 10 facing thereto. 11. The fastener component holding device according to item 10. 12. The component holding device according to claim 7, 8, 9, 10, or 11, wherein the lever has a downward shape.