JPH04115878A - Screw driving device - Google Patents

Abstract

PURPOSE:To simplify the above device, by performing the release of a ratchet wheel and sprocket by an intermediate ring and a taper part formed on the lower face of the ratchet wheel, in case of performing the retraction of a belt. CONSTITUTION:The rest position of a ratchet wheel 23 in a standby state is made in the position releasable from a sprocket 17a at the ratchet wheel 23, in the relation of a taper part 31 and the pin 26 of an intermedium ring 22, or the ratchet wheel 23 is released from a sprocket 17A, in the relation of the taper part 31 and the pin of the intermedium ring 22, with the intermedium ring 22 being rotated with its connection simultaneously, when the abutment end is released from the feeding claw 19 of the sprocket 19a with the operation of a rotation operation lever 35 at the standby state. The sprocket 17A can thus be rotated even in the direction reverse to a belt transfer direction, at the operation time of the rotation operation lever 35, and the pull-back of a screw holding belt 14 can freely be performed at the standby state time.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is used in conjunction with an electric driver tool to continuously drive screws held by a screw holding belt one by one. The present invention relates to a screw driving device that can perform a screw driving operation, and more particularly to a screw driving device that has an increased mechanical strength of the device body so that the pushing operation when driving a screw can be performed stably.

(Prior technology) Used in conjunction with an electric screwdriver tool, the device continuously removes the screws held by the screw holding belt one by one as the main body of the device is pushed into and returned to the surface of the workpiece. Various screw driving devices have been proposed in the past that drive screws while supplying the screws to the screws.

FIGS. 16 and 17 show conventional examples of such screw driving devices.

In these figures, a sliding member 74 slides in the longitudinal direction of the case via a return spring 73 in a rectangular cylindrical sliding guide case 72 connected to the tip of the electric screwdriver tool 70 via a connecting member 71. It is assembled so that it can move freely. This sliding member 7
A screw holding belt 75 in which a large number of screws 75A are held in a row is loaded into the belt loading section No. 4.

A sprocket 76 that meshes with the screw holding belt 75 and a ratchet wheel 77 that meshes with the sprocket 76 are disposed in this belt loading section.

The ratchet wheel 77 is normally biased by a spring in a direction away from the sprocket 76. The ratchet wheel 77 is rotated when the sliding member 74 is pushed into the case 72.
A feed pin 78 protruding from 7 is inserted into the lower side of the rotating lever 84, and a slit 79 cut out in the case 72 is inserted.
Only when passing through the sloped portion 79A of , it is pushed down toward the sprocket 76 and engages with the sprocket 76. At this time, the sprocket 76 rotates and the screw holding belt 75
is transported by one thread section.

Note that the rotating lever 84 is rotatably supported by an upper support shaft 85. At this time, if the sliding member 74 is further pushed into the case 72, the screw 75A can be driven into the member to be driven 81 by the driver bit 8o driven by the electric driver tool 70. Sliding member 74
is returned by the return spring 73, the ratchet wheel 7
Only 7 spins idly and returns to its original state.

Further, an operating lever 86 biased toward the sprocket 76 by a spring is provided on the sliding member 71 so as to be rotatable about a support shaft 87, and normally the abutting end 86b of this operating lever 86
comes into contact with the feed pawl 76A of the sprocket 76 from the counterclockwise direction, so the direction of belt retraction of the sprocket 76 (
(counterclockwise) rotation is prevented.

When the operating end 86a of the operating lever 86 is pressed down, the abutting end 86b is detached from the feed pawl 76A, and the ratchet wheel 77 is normally detached from the sprocket 76, so the belt 75 is pulled back. ) can be carried out freely. This operating lever 86 and the like constitute a belt-free feeding mechanism.

Further, in this screw driving device, elongated holes 82 are formed in the longitudinal direction of both side plates of the case 72, and pins 83 protruding from both side surfaces of the sliding member 74 are loosely fitted into the elongated holes 82. The movement of the sliding member 74 within is guided by these elongated holes 82 and pins 83.

(Problem to be Solved by the Invention) By the way, in the conventional screw driving device described above, since a belt-free feeding mechanism is provided, the ratchet wheel 7
When the feed pin 78 protruding from 7 passes through the inclined portion 79A, the feed pin 78 is inserted under the rotating lever 84, and only at this time, the ratchet wheel 77 is moved to the sprocket 76.
Push it down to the side so that it engages with the sprocket 76. However, the configuration using the rotary lever 84 has a problem that the device is prone to failure due to its complicated operation.The present invention was proposed to solve this problem. The purpose is to provide a highly reliable screw driving device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve this object, the screw driving device according to the present invention has a sliding guide case attached to the tip of an electric screwdriver tool to which a driver bit is attached via a connecting member. The sliding member is slidably inserted into the sliding guide case via the return spring, and the sprocket whose feed pawl protruding from the outer circumference engages with the screw holding belt and the ratchet wheel that engages with this sprocket are connected. When the sliding member is pushed into the sliding guide case against a return spring, the ratchet wheel rotates in the belt conveying direction, and the sprocket that meshes with the ratchet wheel rotates the screw. The holding belt is moved one thread distance, and the screw transferred under the driver bit can be driven by the driver bit, and the sliding member pushed into the sliding guide case is pushed back by the return spring and the ratchet is pushed back. In a screw driving device configured to return both the vehicle and the vehicle to a standby state, a spring-biased circuit is used so that the contact end contacts the feed pawl of the sprocket and prevents rotation in the direction opposite to the direction in which the screw holding belt is transported. A dynamic operating lever is provided on the sliding member, the ratchet wheel is biased toward the sprocket by a spring, and an intermediate ring having a protruding pin facing inward is interposed between the ratchet wheel and the sprocket. Then, a ratchet wheel is placed on the pin of the intermediate ring, and a tapered portion is formed on the lower surface of the ratchet wheel, and at a predetermined rotational position of the ratchet wheel, the tapered portion rides on the pin of the intermediate ring, and the ratchet wheel is placed on the pin of the intermediate ring. The present invention is characterized in that the vehicle is disengaged from the sprocket against a spring.

(Function) According to the above-mentioned configuration, the static position of the ratchet wheel in the standby state is set at a position where the ratchet wheel can be detached from the sprocket in relation to the pin between the taper part and the intermediate ring, or the ratchet wheel is rotated in the standby state. When the lever is operated and the contact end is released from the feed pawl of the sprocket, the intermediate ring is simultaneously rotated so that the ratchet wheel can separate from the sprocket due to the relationship between the taper part and the pin of the intermediate ring. When operating the rotation operating lever, the sprocket can also be rotated in the opposite direction to the belt transport direction, and the screw holding belt can be freely pulled back in the standby state.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

The screw driving device according to the present invention is attached to the tip of an electric screwdriver tool 1 via a connecting member 2, as shown in FIGS. 1 to 3. This screw driving device includes a rectangular cylindrical sliding guide case 4 fixed to an upper connecting member 2 by bolts 3, and a vertical direction (longitudinal direction of the case) that returns into the sliding guide case 4 via a spring 5. It consists of a sliding member 6 that is slidably assembled to the. Note that the perspective view in FIG. 2 is shown with the protection plate 62 removed.

As shown in FIGS. 4 and 5, sliding guide grooves 7 are formed in the vertical direction (longitudinal direction of the sliding member) on both left and right sides of the front and back surfaces of the sliding member 6, and the sliding guide grooves 7 are formed in the vertical direction (longitudinal direction of the sliding member). Convex strips 8 that protrude in the vertical direction on both sides of the back surface of the front plate and the back plate of the guide case 4 fit into these sliding guide grooves 7, respectively, so that the sliding member 6 inside the case 4 can be moved in the vertical direction. The sliding movement is guided by these protrusions 8 and can be performed smoothly. Further, on the left side of the sliding member 6, a groove 9 that determines the sliding range is formed in the vertical direction except for the upper part, and a pin 11 attached to the lower part of the back surface of the left side plate of the case 4 with a screw IO is connected to this groove 9. It fits into the. As a result, when the sliding member 6 returns to the position where the pin 11 contacts the upper end of the groove 9, it is pushed out of the case 4 by the spring 5.

Such a sliding mechanism increases the strength of the case 4 compared to the conventional structure in which elongated holes for sliding guide are formed on both sides of the case, and also allows one screw 10 to be attached to the outside. By simply loosening and removing the case 4 and the sliding member 6, the case 4 and the sliding member 6 can be slid and pulled out, which has the advantage that they can be easily separated during maintenance or repair.

Note that the sliding member 6 has a stopper 12 protruding from the top.
can be pushed into the case 4 to a position where it contacts the adjustment ring 13, and by changing the position of the adjustment ring 13, the pushing depth of the sliding member 6 can be adjusted in accordance with the screw length.

Next, a screw transfer mechanism of the belt loading section 16 that transfers the screw holding belt 14 by one screw section and supplies the screws 15 during the pushing operation of the sliding member 6 into the case 4 will be explained.

Sprockets 17A and 17B are disposed at the center of the sliding member 6 to feed the screw holding belt 14 holding the screws 15 in a row at equal intervals. Two sprockets 17A and 17B, each having a feed pawl 19 protruding from its outer periphery that engages with feed holes 18 on both sides of the belt 14, are fixed to a central shaft 20 facing each other as shown in FIG. A central shaft end 20a protruding from the sprocket 17A (lower side in the figure) is rotatably fitted into a shaft hole 21 formed on the inner surface of the left half 2A of the sliding member 6. Further, a ratchet wheel 23 is fitted into the center shaft 20 protruding from the sprocket 17B on the right side through an intermediate ring 22. This ratchet wheel 23, which is rotatable with respect to the center shaft 20, has a feed pawl 1 on the surface of the right sprocket 17B.
As shown in FIG. 8, a plurality of engaging claws 25 (four in this embodiment) are provided on the surface facing the sprocket 17B, and engage with the same number of engaging recesses 24 (see FIG. 7) that are formed radially.
The ratchet wheel 23 is provided in a protruding manner so as to move the ratchet wheel 23 in the belt transport direction Q.
When the sprockets 17A and 17B are rotated, the engagement pawl 25 engages with the engagement recess 24, allowing the sprockets 17A and 17B to rotate.

As shown in FIG. 9, on the inner circumference of the intermediate ring 22, pins 26 pointing toward the center are protruded at equal intervals of 120 degrees.
The ratchet wheel 23 loosely fitted to the inner circumferential side of the ring has circumferential grooves formed at equal intervals of 120 degrees on the peripheral edge of its lower surface into which the pins 26 are respectively fitted.

Since the intermediate ring 22 is positioned by a rotation preventing means to be described later, the ratchet wheel 23 is regulated by the pin 26 on the ring 22 side, and can rotate by the length of the circumferential groove 27. The feed pin 27 of the ratchet wheel 23 is
However, the slit 30 of the link 29, which will be described later, can also be prevented from coming off. In addition, the rising portions of the circumferential groove 27 on the belt transport direction side each form a tapered portion 31.
As shown in FIG. 10, in the standby state, these tapered portions 31 are respectively mounted on the pins 26 on the ring 22 side, so the engaging pawl 25 of the ratchet wheel 23 does not mesh with the engaging recess 24 of the sprocket 17B. It becomes. In this way, in the standby state, the ratchet wheel 23
has separated from sprocket 17B, so when the free feed mechanism described later is activated, sprocket 17A
, 17B can also be freely rotated in the direction R opposite to the belt transport direction.

The feed pin 28 is rotatably attached to the outer circumferential side of the surface of the ratchet wheel 23 with a screw 32, and slightly protrudes from the outer circumference of the ratchet wheel 23.
The protruding portion 28a of No. 8 is placed on the annular recessed portion 33 on the inner peripheral side of the upper portion of the intermediate ring 22, so that the rotation of the ratchet wheel 23 is supported.

On the left half-rest 6A of the sliding member 6, an operating lever 35 for a free feed mechanism having an operating portion 35a protruding from one end in an operating recess 34 on the front surface is attached to be rotatable in the vertical direction by a support shaft 36. The other end of the lever 35 is always urged toward the sprocket 17B by a biasing pin 39 fitted into the slide 637 via a spring 38. In this state, since the feed blade 19 of the sprocket 17B comes into contact with the other end 35b of the operating lever 35, rotation of the sprockets 17A and 17B in the direction R opposite to the belt transport direction is prevented, and the belt meshing with the sprockets 17A and 17B is prevented. 14 cannot be pulled back.

On the other hand, the rotation of the sprockets 17A and 17B in the belt transport direction Q is performed by pushing up the other end of the operating lever 35 by the feed pawl 19 against the spring 38, while rotating the sprockets 17A and 17B.
Since A and 17B rotate, the belt can be freely pulled out in the transport direction Q.

Operation recess 34 for operating the belt-free feed mechanism
When the operating part 35a of the inner operating lever 35 is pushed down against the spring 38, the other end 35b of the lever 35 is removed from the rotation radius of the sprocket 17B, so the sprockets 17A and 17B can be moved freely in either direction. The belt 14 can be freely rotated, and the belt 14 can be freely pulled out and pulled back.

A stop plate 40 serving as a positioning means for the intermediate ring 22 is fixed on the operating lever 35 by a support shaft 36 and a stop pin 41, and a pin protruding to the outer periphery of the ring 22 is inserted into a slit 42 at the tip of the stop plate 40. The ring 22 is positioned by engaging the ring 43.

A support shaft 45 is provided protruding from a stepped portion 44 on the left half-rest 2A above the sprocket 17B, and a slit 43 on one end side of the support shaft 45 engages with the feed pin 29 of the sprocket 17B. A link 29 is rotatably attached. A pin 46 for rotating the link is rotatably attached to the other end of the link 29 with a screw 47.

An arc-shaped elongated hole 48 is bored in the upper part of the right half-rest 6B to allow the link rotation pin 46 to protrude from the right side surface of the sliding member 6 to the outside.

Further, an arc-shaped elongated hole 49 is bored in the center of the right half-rest 2B so that the engagement state between the slit 42 of the link 29 and the feed pin 28 can be visually observed.

A coil spring 50 is attached to the center shaft 20 of the sprocket 17B that protrudes from the ratchet wheel 23.
The protruding end 20b of 0 is rotatably fitted into a shaft hole 51 formed on the inner surface of the right half-rest 6B of the sliding member 6. The coil spring 50 is formed around the center hole 23a of the ratchet wheel 23 and is fitted into the annular recess 23b.

In this state, when the halves 6A and 6B were tightened with the screws 52, the ratchet wheel 23 was urged by the coil spring 50 and constantly urged toward the sprocket 17B. state.

In the center of the right side plate of the sliding guide case 4, an elongated slit 53 having an outwardly facing inclined portion 53A at its starting end is bored in the longitudinal direction of the case. is loosely fitted.

Note that the link rotation pin 46 is attached to the link 29 after the sliding member 6 is inserted into the case 4.

Next, the operation of the screw transfer mechanism configured as described above will be explained.

First, insert the screw holding belt 14 through the belt cover 54 on the back side of the sliding member 6, and then tighten the sprocket 17A.

Engage belt 14 with 17B. Note that the rotatable belt hook 61 is used to hang the belt 14 that is drawn into the belt loading section 16 so that it does not get in the way.

Thereafter, when the leg 56 is placed on the surface of the member to be driven 55 and the sliding member 6 is pushed into the case 4, when the pin 46 passes through the inclined part 53A of the slit 53, the feed pin 46 is moved as shown in FIG. The ratchet wheel 23 is rotated by the rotation of the link 29 that engages with the link 28 . This ratchet wheel 23
As the ratchet wheel 23 rotates, the ratchet wheel 23 descends from the pin 26 of the intermediate ring 22 and engages with the sprocket 17B.
Rotate sprockets 17A and 17B by one screw section. This sprocket 17A.

By the rotation of 17B, the screw holding belt 14 is transferred by l screw section, and the screw 15 is fed under the driver bit 57. At this time, the screw 15 is held straight in the driving direction by screw holding plates 58 and 58 provided above the left and right legs 56, 56 so as to be rotatable in the vertical direction, as shown in FIG.

When the sliding member 6 is further pushed into the case 4 in this state, the tip of the driver bit 57 engages with the head of the screw 15, detaching the screw 15 from the belt 14, and holding the screw as shown in FIG. While pushing the plates 58 and 58 apart, the screw 15 is driven toward the driving center C of the member 55 to be driven.

After driving the screw, when the tip of the leg 56 of the sliding member 6 is released from the driven member 55, the sliding member 6 is pushed out to a fixed position in the case 4 by the return spring 5. At this time, when the pin 46 passes through the inclined portion 53A of the slit 53, only the ratchet wheel 23 moves in the direction R opposite to the belt transport direction.
and return to standby mode.

Due to this operation, the screw 15 of the screw holding belt 14
can be continuously driven into the driven member 55 one by one. The empty belt after driving the screws 15 is discharged from the belt outlet 59 on the front side of the sliding member 6.

In addition, in this screw driving device, there are 3 holes at the tip of the sliding member 6.
Since only the legs 56 are provided, the tip of the screw 15 can be easily aligned with the driving center C on the surface of the member to be driven 55.

Next, the operation of the belt free feeding mechanism that allows the belt 14 to be pulled back in the opposite direction in the standby state will be explained.

First, when the operating portion 35a at the tip of the operating lever 35 is pressed down as shown in FIG.
Since the other end (contact end) 35b separates from the rotation radius of the feed pawl 19 of the sprocket 17B, the sprocket 17A
, 17B can also rotate in the direction R opposite to the belt transport direction. At this time, the ring 22 with the pin 43 engaged with the stop plate 40 rotates slightly clockwise (belt transport direction) as the operating lever 35 rotates, so that the pin 26 of the ring 22 engages the lower surface of the ratchet wheel 23. Tapered part 3 of
1, and the ratchet wheel 23 further separates from the sprocket 17B. In this state, the belt 14
can be freely pulled back.

This free feeding mechanism is used to prevent the belt 14 from being fed empty.
It can be used when you want to return the screw 15 or when you want to interrupt the work of driving the screw 15.

Next, a screw driving device according to another embodiment will be explained based on FIG. 15.

In this embodiment, the screw 15 held on the belt 14
When the screw is a long screw, an auxiliary leg 60 is attached to the tip of the leg 56 in order to ensure the leg length necessary for driving the long screw. This auxiliary leg 6° includes a contact plate portion 60a that contacts the surface of the member to be driven 55, and a contact plate portion 60a that contacts the surface of the member to be driven 55.
It consists of left and right side plate parts 60b and 60c rising from a, the left side plate part 60b is screwed to the left front and rear legs 56, and the right side plate part 60c is screwed to the right rear leg 56.

〔Effect of the invention〕

As explained above, according to the present invention, when the belt is pulled back, the ratchet wheel and sprocket are separated from each other by the intermediate ring and the tapered part formed on the lower surface of the ratchet wheel. The device can be simplified compared to a driving device.

Therefore, work can be easily carried out during maintenance of the device. Furthermore, since the frequency of failures is reduced, the reliability of the device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a right side view showing a screw driving device according to the present invention attached to an electric screwdriver tool, FIG. 2 is a perspective view of the screw driving device, and FIG. 3 is a right vertical sectional view of the screw driving device. Fig. 4 is a left side view showing the sliding member of the screw driving device, Fig. 5 is a sectional view taken along the line ■-V in Fig. 4,
Figure 6 is a sectional view taken along line VI-Vl in Figure 3, Figure 7 is a plan view of the sprocket, Figure 8 is a rear view of the ratchet wheel, Figure 9
The figure is a plan view of the intermediate ring, Figure 10 is a sectional view taken along the line X-X of Figure 9, Figure 11 is an explanatory diagram of the operation of the ratchet wheel that rotates by the rotation of the link, and Figure 12 is the screw under the driver bit. FIG. 13 is a right vertical sectional view of the tip of the sliding member showing the screw being driven in the middle, and FIG. 14 is a state in which the operating lever is rotated. FIG. 15 is a perspective view of main parts of a screw driving device showing another embodiment, FIG. 16 is a perspective view of a conventional screw driving device, and FIG. 17 is a right side view of a conventional screw driving device. FIG. 1: Electric screwdriver tool 2: Connecting member 4: Sliding guide case 5: Return spring 6: Sliding member 6A, 6B: Half body 7: Sliding guide groove 8: Convex strip 9: Groove for regulating sliding range 11: Pin
14: Screw holding belt 15: Screw 17
A, 17B: Sprocket 18: Feed hole 19
: Feed pawl 20 : Center shaft 21, 51 : Shaft hole 22 : Intermediate ring 23 : Ratchet wheel 24 : Engagement recess
25: Engaging claw 26: Pin 27: Circumferential groove 28: Feed pin 29: Link 30 Nislit 31: Tapered portion 33: Annular recessed portion 35: Operating lever 38: Spring 3
9: Biasing pin 40: Stopping plate 42 Nislit 4
3: Pin 45: Support shaft 46: Link rotation pin 48: Elongated hole 5o: Coil spring 53 Nislit 53A: Inclined portion 54: Belt population 55
: Driving member 56: Leg 57: Driver bit 58: Screw holding plate 59: Belt outlet 60: Auxiliary leg Patent applicant Sanutomi Shoji Co., Ltd. Figure 7A 0a A Figure Figure 10 Figure 20' Figure ff Figure 12 Figure 13 Figure 15

Claims (1)

[Claims] A sliding guide case is attached to the tip of the electric screwdriver tool on which the driver bit is attached via a connecting member, and the sliding member is slidably inserted into the sliding guide case via a return spring, and When a sprocket whose protruding feed pawl engages with the screw holding belt and a ratchet wheel which engages with the sprocket are disposed on the sliding member, and the sliding member is pushed into the sliding guide case against the return spring. The ratchet wheel rotates in the belt transfer direction, and the screw retaining belt is transferred by one screw distance by a sprocket that meshes with the ratchet wheel, and the screw transferred under the driver bit can be driven by the driver bit, and the screw is driven by the driver bit. In a screw driving device configured such that the sliding member pushed into the moving guide case is pushed back by a return spring and the ratchet wheel returns to a standby state, the abutting end abuts the feed pawl of the sprocket. A rotary operating lever biased by a spring to prevent rotation in the direction opposite to the direction in which the screw holding belt is transferred is provided on the sliding member, and the ratchet wheel is biased by the spring toward the sprocket side, and the lever is biased toward the inner peripheral side. An intermediate ring having a protruding pin facing toward is interposed between the ratchet wheel and the sprocket, the ratchet wheel is placed on the pin of the intermediate ring, and a tapered portion is formed on the lower surface of the ratchet wheel. A screw driving device characterized in that, at a predetermined rotational position of the ratchet wheel, the tapered portion rides on a pin of an intermediate ring, causing the ratchet wheel to separate from the sprocket against a spring.