JPS6237650Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention uses compressed air or electricity as a driving source, and uses a screw feeder to feed a connecting screw into a screw extracting portion of a tool body into a driver member. This invention relates to a screw tightening tool in which the screws are pulled out one by one from the most distal side of the screw prior to screwing in.

[Background technology and its problems]

Prior to explaining the present invention, a screw tightening tool of this type that has already been proposed by the applicant will be explained with reference to FIGS. 1 to 6.

FIG. 1 is a longitudinal sectional side view of this screw tightening tool. This screw tightening tool uses compressed air as its driving source. This tool includes a screw feeding device 4 that feeds a screw N into a center hole 3 that serves as a screw extraction portion formed in a nose 2 that is integrally provided at the lower end 1a of the tool body 1 in the figure, and a screw driving device 5 for driving the screw N fed into the material to be screwed (not shown); and a screw driving device 6 disposed on the tip 2a side of the nose 2 for driving the screw into the material to be screwed after driving. It is equipped with

The driving device 5 includes a striking cylinder 7 disposed in the tool body 1, a striking piston 8 slidably and tightly fitted into the striking cylinder 7, and a driving piston 8 rigidly connected to the striking piston 8. Driver 9 and
A main air chamber 10 is formed around the upper end of the striking cylinder 7 and stores compressed air for forward movement of the striking piston 8;
A blowback air chamber 11 is formed around the lower end of the blowback air chamber 11 in which compressed air for backward movement of the blowing piston 8 is stored; It is comprised of a head valve 13 that switches between the main air chamber 10 or between the piston upper chamber 7A and the exhaust passage 12.

Further, the screwing device 6 starts operating by the air pressure of the compressed air supplied from the blowback air chamber 11 when the striking piston 8 reaches the bottom dead center, that is, when the driving of the screw N is finished. It is composed of

An air motor is used as a driving source for the screwing device 6. This air motor is housed in a cylindrical housing 15 that is integrally formed at the bottom of a cylindrical magazine 14 for storing screws that is arranged to protrude from one side of the tool body 1.
The drive shaft of this air motor is directed forward (to the left in FIG. 2) from one end (left end in FIG. 2) 15a of the housing 15 via a speed reduction device (not shown) housed in the housing 15. It is connected to a protruding rotary drive shaft 16. A first bevel gear 17 is provided at the tip of the drive shaft 16.

Further, at the tip 2a of the nose 2, a cylindrical first socket member 18 serving as a screw guide member is provided. This socket member 18 is connected to the hexagonal head of the screw N driven by the driver 9.
It has a function of guiding N ₁ into a screw insertion hole 19 formed at the center of the socket member 18 toward a second socket member 22, which will be described later.

A second bevel gear 20 that meshes with the first bevel gear 17 is integrally assembled on the outer periphery of one end (lower end in FIG. 1) 18a of the first socket member 18. The first socket member 18 is supported by a cap-shaped socket holder 21 such that the screw insertion hole 19 is coaxial with the center hole 3 of the nose 2. Bearings are provided between the outer circumference of the other end (upper end in the figure) 18b of the socket member 18 and the inner circumferential wall of the socket holder 21, and between the outer circumference of the second bevel gear 20 and the inner circumferential wall of the socket holder 21. 18 is interposed, and the socket member 18 is supported so as to be freely rotatable in the direction around the axis.

Then, one end 1 of the first socket member 18
A second socket member 22 serving as a screw rotating member is disposed on the 8a side. The second socket member 22 has a screw fitting hole 23 having a hexagonal cross section in which the head _N1 of the screw N is fitted, held and positioned at its center, and the second socket member 22 has a screw fitting hole 23 having a hexagonal cross section in which the head N1 of the screw N is fitted, held and positioned. It has the function of screwing the screw N driven into the material to be screwed through the screw insertion hole 19 of the socket member 18 into the material to be screwed. The second socket member 22 is inserted into the first socket member 18 such that its screw fitting hole 23 is coaxial with the screw insertion hole 19 of the first socket member 18.
Its outer periphery is fitted and held by the second bevel gear 20 whose one end 20a protrudes from one end 18a.

Further, the tip 22 of the second socket member 22
A contact block 25 having a buffer material 24 is disposed on the outer periphery of the a side so as to be able to reciprocate in the axial direction of the socket member 22. This contact block 25 is assembled and fixed to one end 28a of a contact arm 28 which is mechanically interlocked with a trigger device 27 provided at the base of a grip portion 26 protruding from one side of the tool main body 1. . That is,
The ON operation signal can be sent to the driving device 5 only after the contact block 25 is first pressed against the surface of the material to be screwed, the contact arm 28 is pushed up, and the trigger lever 29 of the trigger device 27 is pulled up.

On the other hand, as shown in FIG. 2, a large number of screws N driven into a material to be screwed by the driving device 5 are connected and held by a holding member 30 so as to be arranged in parallel.

The holding member 30 is made of a flexible synthetic resin and has a large number of screw holding bodies 31, 31, .
The holding body 31 is composed of two pairs of side plate portions 32, 33, 34, and 35 that face each other in parallel. At the center of the upper and lower side plate parts 32 and 33, a fitting hole 3 into which the body part N ₂ of the screw N is inserted is provided.
6, 37 are formed. Each of the above-mentioned insertion holes 36,
By fitting and holding the neck portion N ₂ ′ and the body portion N ₂ of the screw N into the holder 37, the screw N is held perpendicularly to the holder 31.

Left and right side plate portions 3 of each of the above-mentioned holders 31, 32...
Both side edges 35A of one side plate portion 35 of 4, 35,
35B are integrally connected, and each of the above screws N, N
. . . are arranged in parallel by the respective holders 31, 31 .

In this way, the connecting screw 100, in which a large number of screws N, N, . . . are connected, is housed in the magazine 14 in a coiled state.

Further, the screw feeding device 4 is disposed between the magazine 14 and the nose 2. The screw feeding device 4 has a pair of screw guide plates 38 and 39 that guide the travel of the connecting screw 100 fed from the magazine 14 to the nose 2, as shown in FIG. Each guide plate 3 above
One of the screw guide plates 38 of 8 and 39 is made of a plate that connects the nose 2 and the magazine 14, and the other screw guide plate 39 is
It consists of a door plate that opens and closes one side of the one screw guide plate 38. The other screw guide plate 39
The hinge portion 39a that serves as the opening/closing fulcrum of the nose 2
It is formed in the part of

Further, on the back side of one of the screw guide plates 38, as shown in FIG. It is arranged. The above feed piston/cylinder mechanism 4
1 consists of a cylinder portion 42 that communicates with the blowback air chamber 11, and a piston portion 43 that is slidably and tightly fitted into the cylinder portion 42. The piston portion 43 includes the cylinder portion 4
A piston rod 44 projecting outward from the piston rod 2 is integrally connected with the piston rod 44, and the feed pawl 40 is rotatably assembled to the tip 44a of the rod 44.

Then, the feed pawl 40 scratches the window portions 50, 50, . The fibers are fed into the center hole 3 one by one. That is, when the compressed air in the blowback air chamber 11 supplied to the piston upper chamber 42A of the cylinder part 42 is released, the piston part 43 is disposed in the piston lower chamber 42B of the cylinder part 42. It slides in the direction of arrow A in FIG. 4 due to the elastic force of the compression coil spring 45.
When the rod 44 protrudes from the cylinder portion 42 due to the sliding of the piston portion 43, the feed pawl 40 passes through the long hole 46 formed in the one screw guide plate 38 to screw the screw. The window portion 50 of the connecting screw 100 that protrudes from the surface side of the guide plate 38 is scratched in the nose 2 direction as shown in FIG. One by one from N to the above nose 2
The screw is fed into the center hole 3 through a screw supply port 48 opened on one side of the screw.

Further, the piston upper chamber 42 of the cylinder portion 42
When compressed air in the blowback chamber 11 is supplied into the chamber A, the piston portion 43 slides in the direction of the arrow B in FIG. 4 against the elastic force of the coil spring 45. Due to this sliding movement of the piston portion 43,
The rod 44 enters into the cylinder portion 42, and the feed pawl 40 retreats toward the back side of the screw guide plate 38, and enters a position to feed the screw N to be driven next.

That is, in this tool, when the contact block 25 is pressed against the surface of the material to be driven and the trigger device 27 is turned on, the driver 9 is fed into the center hole 3 of the nose 2 by the screw feeding device 4 in advance. A screw N is driven into the material to be screwed through the screw insertion hole 19 of the first socket member 18. After the screw N is driven in, an ON operation signal is sent to the screwing device 5, the rotation drive shaft 16 rotates, and the first and second socket members 18 and 22 rotate in the direction around the axis. do.
Due to this rotation, the second socket member 22
The screw N that is fitted and held inside is screwed into the material to be screwed. In addition, screw N
The holder 31 with the embossed holder 31 has a window 5 formed in the front wall 49 of the nose 2 in the screw feeding direction.
1 (see FIG. 5).

In the screw tightening tool, there is a width between each of the screw guide plates 38 and 39 as shown in FIG.
A gap is formed that constitutes a screw feed passage 52 in which W ₁ is slightly wider than the width W ₂ of the head N ₁ of the screw N.

And, on each opposing surface 38A, 39A of each guide plate 38, 39, each holding body 31, 31... of said holding member 30 can run in a straight line.
Screw holder guide grooves 53, 5 each having a substantially U-shaped cross section in which these holders 31, 31... guide the travel.
3 is formed.

By the way, since the above-mentioned holding bodies 53, 53 ... are made of a synthetic resin having flexibility, when the connecting screw 100 is stored or when the magazine 1 is inserted,
When the coil winds and stores in the coil winding coil 4, the left and right side plate portions 34, 35 may be deformed so as to bulge outward as shown in FIG.
If the connecting screw 100 is inserted in the direction of the nose 2 while the side plate portions 3 are in the deformed state,
The outer surface 54A of the bulging portions 54, 55 of the
55A is a side wall portion 53 of each of the guide grooves 53, 53
As a result, the connecting screw 100 is pushed into the screw feed passage 52 by frictional resistance.
This meant that it was no longer possible to travel smoothly inside the vehicle.

Therefore, this is not preferable as it causes failure of feeding of the connecting screw 100 and the like.

[Purpose of invention]

Therefore, the present invention has been proposed to overcome these conventional drawbacks, and improves the performance of the connecting screw by ensuring that each holder of the connecting screw can always run smoothly within the screw feed path. The purpose of the present invention is to provide a new screw tightening tool with stable feed.

[Summary of the idea]

In order to achieve the above object, the gist of the present invention is to connect a large number of screws by a connecting member formed by connecting a large number of flexible screw holders with a rectangular cross section in series. The screw feeding device has a screw feeding device that feeds the connecting screws, which are held in parallel alignment, one by one into the screw extraction part of the tool body, starting from the leading edge of the connecting screws, and this screw feeding device has a pair of screw guide plates facing each other. A screw holder guide groove having a substantially U-shaped cross section is formed on each opposing surface of each guide plate, and a screw holder inverted portion is formed on the wall surface of each guide groove. There is a screw tightening tool formed by forming.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. In this embodiment, the structure of the screw tightening tool is almost the same as that of the conventional tool except for the main parts, and only the main parts will be specifically explained.

FIG. 8 is an enlarged vertical side view showing a portion of the screw feeding passage. In this screw tightening tool, the width W ₁ is the width of the head N ₁ of the screw N, as in the conventional tool, between the pair of screw guide plates 38 and 39.
A gap is formed that constitutes a screw feed passage 52 that is slightly wider than _W2 .

Each opposing surface 38A of each guide plate 38, 39,
39A, screw holder guide grooves 53, 53 having a substantially U-shaped cross section are formed along the screw feeding direction. In each of these guide grooves 53, 53, the upper and lower wall portions 53B, 53C, 53B, 53C guide the upper and lower side plate portions 32, 33 of the holding body 31, and the side wall portions 53A, 53A guide the left and right side plate portions of the holding body 31. 34 and 35.

Each side wall portion 53A, 53A has auxiliary grooves 56, 57 having a substantially U-shaped cross section and serving as an inverted portion of the screw holder.
is formed. In addition, each of the above-mentioned auxiliary grooves 56, 5
The depth h ₁ of one of the grooves 57 is approximately 1 mm, and the depth h ₂ of the other groove 56 is approximately approximately 1 mm in order to ensure the strength of the screw guide plate 38, that is, the strength of the nose 2. It is 0.5mm.

By forming the auxiliary grooves 56 and 57, even if the left and right side plate portions 34 and 35 of the screw holder 31 are deformed so as to bulge outward as shown in FIG. , its bulging portion 54,5
5 into the auxiliary grooves 56, 57 as shown in FIG. 9, the screw holder 31 can be run.

Therefore, in this tool, the bulging portions 54 and 55 are connected to the respective guide grooves 53 and 5 as in the conventional case.
No frictional resistance is generated due to sliding contact with the side wall portions 53A, 53A of No. 3, and the connecting screw 100 can be smoothly fed in the direction of the nose 2. Therefore, it is possible to reliably prevent feeding failure of the screw N, etc.

In addition, in the present invention, each of the bent portions 31a, 31b, 3 of the holder 31 is provided in each of the guide grooves 53, 53.
Corner portion 53 that determines the running position of 1c and 31d
a, 53b, 53c, 53d are formed, and if the bulging portions 54, 55 of the holding body 31 are reversed, the auxiliary grooves 56, 5
The shape is not limited to 7.

[Effect of idea]

As described above, according to the present invention, even if the screw holder is deformed so as to bulge outward,
The holding body can be smoothly run within the screw feeding passage. Therefore, it is possible to avoid poor feeding of the connecting screw, and it is possible to ensure stable feeding of the screw.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of a screw tightening tool already proposed by the applicant, Fig. 2 is an enlarged perspective view of the external appearance of the connecting screw, Fig. 3 is an enlarged plan view showing the screw feeding passage, and Fig. 4 The figure is an enlarged cross-sectional plan view showing the screw feeding device, Fig. 5 is an enlarged longitudinal front view showing the screw feed passage, Fig. 6 is an enlarged perspective view showing the feeding state of the connecting screw, and Fig. 7 is the screw feed passage. An enlarged perspective view showing a deformed state of the holding body, FIGS. 8 and 9 are views showing an embodiment of the present invention, FIG. 8 is an enlarged longitudinal front view showing a screw feeding passage, and FIG. FIG. 7 is an enlarged longitudinal sectional front view showing a state in which the deformed screw holder is inserted into the feeding passage. 2... Nose, 3... Center hole, 4... Screw feeding device, 30... Holding member, 31... Screw holder,
38, 39...screw guide plate, 38A, 39A...
...Opposing surface, 52...Screw feed passage, 53, 53...
...screw holder guide groove, 56, 57...auxiliary groove,
100... Connection screw, N... Screw.

Claims (1)

[Scope of utility model registration request] A connecting screw in which a large number of screws are aligned and held in parallel by a connecting member formed by connecting a large number of flexible screw holders with a rectangular cross section in series, and the one on the most extreme side. It has a screw feeding device that feeds the screws one by one into the screw extraction section of the tool body, and this screw feeding device has a screw feeding passage formed between a pair of mutually opposing screw guide plates, and has a screw feeding passage formed between a pair of screw guide plates facing each other. A screw tightening tool comprising screw holder guide grooves each having a substantially U-shaped cross section formed on each opposing surface, and a screw holder inverted portion formed on the wall surface of each of the guide grooves.