JP2520358B2 - Screw supply belt - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw supply belt for holding and retaining a large number of drilling screws at predetermined intervals in a planted state and intermittently supplying one to each automatic screwdriver in a progressive state. It is about.

[0002]

2. Description of the Related Art Drilling screws have been increasingly used in recent years as a convenient screw part capable of drilling, screwing and tightening a prepared hole in a steel plate or a woodworking board for building materials in one operation. In addition, a screw driving device for driving these drilling screws continuously and efficiently is also available, for example
It has already been proposed in Japanese Patent Publication No. -60667 and others. The screw feeding belt which is the object of the present invention is used by being attached to the above-mentioned screw driving device, and in particular, a large number of dish-shaped or trumpet-shaped drilling screws having the head seat surface constricted in a slanting direction orthogonal to the face plate. In this case, it is locked and held at a predetermined interval in a planted state, and the screw is intermittently supplied to the shaft center of the automatic screwdriver in a progressive feed state one by one.

In the screw driving device, for example, as shown in FIG. 1, an automatic screwdriver 2 is mounted on the tip of the main shaft of a power driver 1, and a screwdriver bit 7a is formed on the tip of the automatic screwdriver 2. Powered driver 1 at the base
The driver 7 supported by the rotary chuck is housed in the shaft center, and the tip end side is spring-supported and normally protrudes forward, and the shaft center retreats when the tip end is pressed against the fastening member. A slide expansion / contraction unit 3 is provided that can move forward and backward. A large number of drilling screws 5 are engaged with the slide expanding / contracting portion 3 with a feeding means of a screw supply belt 4 which is locked and held at a predetermined interval in a planted state, and the screw supply belt 4 is engaged.
Drive mechanism 6 such as a sprocket that intermittently travels to sequentially feed the drilling screw 5 to the tip side of the driver bit 7a, and a driver bit 7a that is formed with a driver bit 7a that fits into the engaging groove of the screw head such as a cross hole. The tip portion of the is housed. The screw supply belt 4 is a band-shaped plate made of a soft synthetic resin material and is provided with screw insertion means for engaging and holding a large number of drilling screws 5 in the center of a face plate along the longitudinal direction at a constant interval equal to the feed pitch. At the same time, the feeding means is provided on both sides of the screw inserting means by a notch-shaped feeding groove or the like that engages with the drive mechanism 6 such as the sprocket in a meshed state.

The above-described screw driving device is spring-supported when the tip of the slide expansion / contraction part 3 is brought into contact with the surface of the mounting plate 9 attached to the member 8 to be fastened and pressed while the power driver 1 is being held. The slide telescopic part 3 contracts while being slid backward to the power driver 1 side, during which the sprocket of the drive mechanism 6 rotates by one frame and the screw supply belt 4 is fed by one pitch to the automatic screwdriver 2 side, When the drilling screw 5 is stopped at the front position aligned with the axis of the driver and the slide telescopic portion 3 is further shortened, the driver bit 7a is fitted and locked in the engagement groove of the drilling screw 5. In this state, power switch 1 of power driver 1
When a is inserted and the driver 7 is driven to rotate, the drilling screw 5 is pushed out from the screw supply belt 4 while rotating, and the mounting plate 9 and the member to be fastened 8 are used to pierce, screw and tighten the prepared hole. Then, the attachment plate 9 and the fastened member 8 are fastened.

Conventional screw supply belts of this type include, for example, Japanese Examined Patent Publication No. 57-61927 and Japanese Utility Model Publication 4-4.
There is a prior art disclosed in the publication of No. 9367 or Japanese Utility Model Publication No. 58-47299. Details of these screw supply belts are referred to respective publications, and the outline thereof will be described here. Japanese Patent Publication No. 57-61927 (Prior Art 1) The supply belt 10 has a longitudinal length of the strip plate 11 which is intermittently run at a constant feed pitch by a feed means (not shown) engaging with a guide as shown in FIG. At the center of the face plate along the direction, screw insertion means are provided at regular intervals equal to the feed pitch. The screw insertion means is made to communicate with each other by the linear slits 15 engraved in a manner that radially extends between the screw insertion hole 12 and the small-diameter punched holes 16 formed on the outer periphery thereof. There is. In this supply belt 10, the face plate between the screw insertion hole 12 and each of the extraction holes 16 divided by the linear slit 15 forms a flexible elastic locking piece 13, and the screw insertion hole 12 has a drilling screw. When 14 is inserted, the elastic locking piece 13 is provided so as to project in a curved shape toward the lower surface side in such a manner that the upper surface of the strip-shaped plate 11 is depressed into a dish shape.
The drilling screw 14 is engaged and held in the implanted state. Also,
When the driver bit is fitted and locked in the engaging groove 24a on the upper surface of the head and the drilling screw 14 is rotationally driven, the elastic locking piece 13 is pushed from the portion of each linear slit 15 by the screwing thrust.
Are pushed open to widen the screw insertion hole 12, and the drilling screw 14 is pushed out to separate from the supply belt 10.
At that time, each of the holes 16 assists the elastic locking piece 13 to be easily spread.

Japanese Utility Model Publication No. 4-49367 (Prior Art 2) As shown in FIG. 3, the supply belt 20 extends along the longitudinal direction of a strip-shaped plate 21 having feed grooves 27 on both sides thereof, and at the center of the face plate. Screw insertion means is provided at regular intervals equal to the feed pitch. This screw insertion means is a strip-shaped plate 2
1. A screw insertion hole 22 having a cylindrical lip 23 protruding from the lower surface of 1 and a small-diameter punched hole 26 formed in the outer periphery of the insertion hole 22 are engraved in a manner extending radially. The linear slits 25 provided are connected to each other, and the inner end side of each linear slit 25 has a cylindrical lip 2
3 extends vertically between the lower ends of the cylindrical lips 23 in a manner of partitioning the outer peripheral wall surface. In this supply belt 20, the drilling screw 24 inserted into the screw insertion hole 22 is planted in a state of being locked and held by a cylindrical lip 23 having a linear slit 25 formed therein. Further, when the driver bit is fitted and locked in the engagement groove 24a on the upper surface of the head and the drilling screw 24 is rotationally driven, the cylindrical lip 23 is expanded from the portion of each linear slit 25 by the screwing thrust and the screw is inserted. Expand the hole 22 and drill the screw 24
Are pushed out and separated from the supply belt 20. At this time, the hole 26 assists the linear slits 25 to be easily spread.

As shown in FIG. 4, the feeding belt 30 is arranged along the longitudinal direction of a strip plate 31 having feed grooves 37 on both sides thereof, and at the center of the face plate. Screw insertion means is provided at regular intervals equal to the feed pitch. The screw insertion means includes a screw insertion hole 32 provided with a cylindrical lip 33 protruding from the lower surface of the band-shaped plate 31 in such a manner that the upper surface is depressed in a dish shape, and the insertion hole 32.
Extending radially from the inner end side of the cylindrical lip 33.
Is formed by the linear slits 35 engraved so as to extend vertically between the lower ends of the cylindrical lips 33 in a manner of partitioning the outer peripheral wall surface. In this supply belt 30, the drilling screw 34 inserted into the screw insertion hole 32 is planted in a state of being locked and held by a cylindrical lip 33 having a linear slit 35 formed therein. Further, when the driver bit is fitted and locked in the engaging groove 34a on the upper surface of the head and the drilling screw 34 is driven to rotate, the cylindrical lip 33 is expanded from the portion of each linear slit 35 by the screwing thrust, and the screw is inserted. Expand the hole 32 and use the drilling screw 34
Is pushed out and separated from the supply belt 30.

These conventional supply belts are used in the case of small screws or bolts such as drilling screws for fastening thin steel plates to each other such that the length under the head and the shaft are relatively short and the screw pitch is fine. Can easily hold the screw with respect to the supply belt in a state where it is easily engaged with the driver bit, and can relatively easily push the screw out from the supply belt by applying a large screwing thrust. That is, in the case of a drilling screw for steel plate, since the screw thread under the head to be engaged and held is substantially symmetrical and its own weight is light, the screw insertion hole is expanded or contracted by providing a linear slit. Even with the supply belt of, there is no worry of tilting or shaking due to the screw thread when inserted,
The screw can be stably held in a state where the screw is orthogonal to the supply belt and the height from the upper surface is uniform. Further, since a large screw-in thrust force is required when drilling a steel plate or the like, this thrust force easily pushes out from the supply belt, and even if the screw-in thrust force is used for fastening, the fastening member is not damaged.

[0009]

However, as a supply belt for a drilling screw for woodwork, which has been rapidly increasing in demand in the housing industry for fastening woodworking boards for building materials, etc. in recent years, these conventional belts have been used. Supply belts have not always worked well. This drilling screw for woodwork is generally called as a dry wall and is widely used as a substitute for a wood screw.For example, a relatively fragile fastening member unlike a steel plate such as plywood, hard board or gypsum board. In addition to being used for fastening, a relatively long drilling screw with a trumpet-shaped head seat surface and a rough pitch is used. The problem like this occurs.

(1) When a drilling screw having a trumpet-shaped head is used as a base material such as a gypsum board as a fastening member, the screw insertion means of the screw supply belt requires good expansion / contraction performance. With conventional screw supply belts that have excessive locking and holding force, the screw may be pushed out by a large screw-in thrust force, which may damage the fastening member or the desired tightening force may not be obtained.A small screw-in thrust force pushes the linear slit above. Since it takes a long time to expand the diameter of the screw insertion hole so that the screw cannot be easily pushed out, problems such as a decrease in work efficiency and fatigue of a worker occur. (2) It is difficult to implant the drilling screw in the orthogonal state with respect to the screw supply belt, and it is difficult to supply the drilling screw on the coaxial line of the driver bit due to the inclined state of the drilling screw. If the screw is fastened in a tilted state, or the driver bit is not fitted and locked in the fitting groove of the screw head, the screw cannot be fastened. For example, conventional techniques 1 and 3
As shown in FIGS. 5A and 5C, when the screw insertion holes 12 and 32 are made small, the screw supply belts 10 and 30 of FIG. The lip 33 is transformed into an inclined point contact state,
The perpendicularity of the drilling screws 14 and 34 with respect to the strip plates 11 and 31 becomes unstable, and the coaxiality is not constant. On the contrary, when the screw insertion holes 13 and 33 are made large, the retaining force of the elastic locking piece 13 or the cylindrical lip 33 is weakened, and the drilling screws 14 and 34 that are inserted and attached easily tilt or fall off due to their own weight. (3) In the screw supply belt 20 of the prior art 2, FIG.
As shown in FIG.
Since it can not be stably held with the height protruding from the upper surface of the screwdriver, the engagement position with the driver bit is not constant or it is caught in the screw driving machine, causing a mistake become. Therefore, in the present invention, it is an object of the present invention to solve these problems of the prior art and to provide a screw supply belt which is particularly suitable as a supply belt for drilling screws for woodworking and which can also be used as a supply belt for drilling screws for steel plates. It is what

[0011]

A screw feeding belt according to the present invention for solving this problem has the following constitutional requirements. A drilling screw is provided on a strip plate made of a soft synthetic resin at regular intervals so that the drilling screws are locked and held in the state of being planted, and the strip plate is mounted on an automatic screwdriver and provided on the strip plate. The feed means is engaged with the driving device on the automatic screw driving machine to intermittently run at a constant feed pitch, while the drilling screw is sequentially supplied to the tip side of the axis of the driver bit mounted on the automatic screw driving machine. Then, in the screw supply belt for pushing out the drilling screw whose head is engaged with this driver bit from the screw inserting means of the belt-like plate by the rotational driving force to perform the screw fastening to the fastening member, the screw inserting means is , A bottomed cylindrical boss formed by an outer peripheral wall projecting to the lower surface side of the strip plate and the bottom plate, the upper end edge of the cylindrical boss supporting the outer periphery of the middle part of the screw head. State In the inner diameter of the outer peripheral wall forms a guide hole for accommodating a part of the head of the screw to loosely fitted,
A screw insertion hole into which a screw shaft is inserted is bored concentrically with the guide hole in the bottom plate, and the strip plate has a radial shape that extends radially outward from the maximum diameter of the screw head from the guide hole. The slot is formed, and the longitudinal end is formed in the outer peripheral wall of the cylindrical boss in such a manner that the inner end and the upper end of the radial slot communicate with each other and the lower end terminates immediately before the bottom plate. The cylindrical boss is spread out from the longitudinal slot by the screwing thrust of the driver bit against the drilling screw, and the cylindrical boss is broken so that the terminal end of the longitudinal slot and the screw insertion hole communicate with each other.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The screw feeding belt of the present invention will be described in detail below with reference to the illustrated embodiments. This screw supply belt 40
As shown in FIG. 6, a screw for engaging and retaining a large number of drilling screws 42 in a planted state at a center of a face plate along a longitudinal direction of a strip plate 41 made of a soft synthetic resin material such as low density polyethylene. Insertion means are provided at constant intervals equal to the feed pitch, and notch-shaped feed grooves 43 are provided on both sides of the screw insertion means as feed means for engaging with a drive mechanism such as the sprocket or the like in a meshed state. ing. This screw insertion means is provided on the bottom plate 45b of the cylindrical boss 45 and the bottomed cylindrical boss 45 protruding from the lower surface of the strip plate 41 so that the inner diameter of the outer peripheral wall 45a forms the guide hole 44. A screw insertion hole 46 formed concentrically with the guide hole 44, and a radial groove hole 47 formed in the belt-shaped plate 41 so as to extend radially from the guide hole 44 in all directions.
The inner end and the upper end side of the radial groove hole 47 communicate with each other, and the lower end side is bored in the outer peripheral wall 45a of the cylindrical boss 45 so as to terminate immediately before the bottom plate 45b of the cylindrical boss 45. And a vertically elongated slot 50 having a V or U shape.

The screw insertion hole 46 has a trough of the screw shaft 48 so that the screw shaft 48 of the drilling screw 42 to be inserted thereinto is inserted and the outer periphery of the screw head 49 having a trumpet shape is engaged and held. The diameter is smaller than the diameter D ₄ . The guide hole 44 of the cylindrical boss 45 accommodates a part of the screw head 49 of the drilling screw 42 to be inserted and the upper opening end edge 44a of the guide hole 44 is an intermediate portion of the screw head 49. The diameter and depth are set so as to support the outer periphery at least in a range smaller than the maximum outer diameter D ₁ of the screw head 49 and larger than the maximum outer diameter D ₃ of the screw shaft 48, and preferably the thread is rolled. The guide hole 44 having a diameter slightly larger than the diameter D ₂ is provided so that the outer diameter of the screw is not interfered with much. Further, the radial groove hole 47 is formed in the shape of a water droplet widened toward the outside, and the outer end of the radial groove hole 47 extends beyond the maximum outer diameter D ₁ of the screw head 49. At the same time, the longitudinal slot 50 is formed so that its diameter gradually increases toward the upper end side, and the lower end side of the longitudinal slot 50 is placed on the bottom plate 45b.
At the lower end of the cylindrical boss 45 which terminates immediately before, a part of the outer peripheral wall 45a, which is slightly left, is connected in an annular shape.
As a result, the expansion / contraction performance of the screw insertion portion is improved, and the screwing thrust when the screw head 49 of the inserted drilling screw 42 is pushed out from the screw insertion hole 46 is reduced. It is desirable that the radial groove holes 47 and the vertically elongated groove holes 50 have a groove width as large as possible within a range in which the strength of the cylindrical boss 45 is not deteriorated.

When the drilling screw 42 is inserted into the screw supply belt 40, the screw head 49 partially accommodated in the guide hole 44 is inserted into the screw head 49 having the thread rolling diameter D ₂ formed on the terminal side. The screw head 49 is locked and held by the hole 46, and above the screw head 49, the outer periphery of the intermediate portion of the screw head 49 is located above the guide hole 4.
4 is abutted and supported by the upper opening edge 44a of the screw head 49,
Is seated in such a manner that its top surface projects from the strip plate 41 at a constant height H. When the drilling screw 42 inserted into the screw supply belt 40 is rotationally driven by the driver bit 7a mounted on the automatic screwdriver 2, the screw head 49 which receives the screwing thrust force has a radial groove hole 47. The cylindrical boss 45 is expanded from the portion of the longitudinal slot 50 with the help of the above, and the outer peripheral wall 45a connected in an annular shape at the lower end of the cylindrical boss 45 is broken, and the end side of the longitudinal slot 50 is broken. And the screw insertion hole 46 communicate with each other. As a result, the screw insertion hole 46 is expanded to the radial groove hole 47 through the vertically elongated groove hole 50, and the outer end portion of the radial groove hole 47 has a screw head 49.
Since it extends to the outside of the maximum outer diameter D _{1 of} the drilling screw 42, the drilling screw 42 is pushed out of the screw supply belt 40 and separated.

Next, a method of manufacturing the screw supply belt according to the present invention will be described with reference to FIG. This screw supply belt 40
A soft synthetic resin material is used as the material of the above, and among them, it is particularly preferable to use low density polyethylene as the existing material. That is, since low density polyethylene is excellent in flexibility and malleability, it can be easily plastically processed like a metal material, and can be extruded or drawn by cold plasticity, which is economical. Target. The screw supply belt 40 is formed on the belt-shaped plate 41 by using, for example, a progressive feed die device. The forming sequence is such that the feed groove 43 is punched first, and then the screw insertion hole 46 and the radial groove hole are formed. The punching of 47 is performed at the same time, and finally the cylindrical boss 45 is plastically worked.

Next, another embodiment of the screw supply belt according to the present invention will be described with reference to FIG. This screw supply belt 51 is
In particular, the radial groove hole 52 is formed into an elliptical shape with a constant width, and the other configurations are the same as in the case of the previous embodiment. That is, the feed grooves 54, 54 are provided on both sides of the strip plate 53, and the screw insertion means for inserting the drilling screw 55 has a guide hole 57 in the inner diameter of the cylindrical boss 56 and a screw insertion hole 58 in the bottom plate. The longitudinal slot 5 formed on the outer periphery of the cylindrical boss 56 communicates with the inner end of the radial slot 52.
9 is provided.

[0017]

As is apparent from the above embodiments, the following effects can be expected with the screw feeding belt of the present invention. (1) The drilling screw planted in the bottomed cylindrical boss that is the screw insertion means has the outer periphery on the terminal end side of the screw head engaged and held in the screw insertion hole formed in the bottom plate, and Since the outer periphery of the intermediate portion above it is supported by the upper opening edge of the guide hole formed by the inner diameter of the outer peripheral wall, the drilling screw can be locked and held on the strip plate in a stable orthogonal state without runout or inclination. . (2) A longitudinal slot is formed on the outer peripheral wall of the cylindrical boss so that it terminates immediately before the bottom plate, and the outer peripheral surface of the screw shaft portion inserted into the screw insertion hole formed in the bottom plate is It is held all around, and when the upper opening edge is biased in the radial direction by the abutment and locking of the screw head, the screw insertion hole is in a reduced diameter state, so use a thin bottom plate. A necessary and sufficient locking holding force can be obtained even with a slightly or slightly larger screw insertion hole. (3) The radial slot formed in the strip plate and the longitudinal slot formed in the outer peripheral wall of the cylindrical boss in communication with the radial slot are longer than the conventional linear slit. Since the boss is provided with extremely high expansion / contraction performance, it is possible to reduce the screwing thrust when the screw head is pushed out from the screw supply belt. (4) The outer peripheral wall of the cylindrical boss and the bottom plate are connected to each other only at a small portion where there is no longitudinal slot, so it is easy with a small thrust when pushing the screw head from the screw supply belt. It can be detached from the screw feed belt by breaking. (5) Part of the screw head is housed in the guide hole in a loose fit,
Since there is little deformation of the cylindrical boss and the upper surface of the screw head is maintained at a substantially constant height from the strip plate, the screw supply belt including the drilling screw is caught on the automatic screwdriver side and Supply will not be hindered.

[Brief description of drawings]

FIG. 1 is a usage state diagram in which a screw feeding belt, which is a target of the present invention, is attached to a screw driving device to fasten a fastening member.

2A and 2B are a plan view and a side view illustrating a screw supply belt according to a conventional example.

FIG. 3 is a plan view and a side view illustrating a screw supply belt according to another conventional example.

FIG. 4 is a plan view and a side view illustrating a screw supply belt according to still another conventional example.

FIG. 5 is a vertical cross-sectional view in which a drilling screw is attached to a screw supply belt according to a conventional example.

6A and 6B are explanatory views of a screw supply belt according to an embodiment of the present invention, in which FIG. 6A is a plan view, FIG. 6B is a side view, and FIG.
Is a vertical cross-sectional view taken along the line CC of FIG.
A vertical sectional view taken along the line, (e) shows a vertical sectional view taken along the line EE of (a).

FIG. 7 is a plan view and a side view illustrating a method of manufacturing a screw supply belt according to an embodiment of the present invention.

FIG. 8 is a plan view and a side view illustrating a screw supply belt according to another embodiment of the present invention.

[Explanation of symbols]

 40,51 Screw supply belt 41,53 Strip plate 42,55 Drilling screw 43,54 Feed groove 44,57 Guide hole 45,56 Cylindrical boss 46,58 Screw insertion hole 47,52 Radial groove hole 48 Screw shaft 49 Screw head Part 50, 59 Longitudinal slot

Continuation of the front page (56) Reference JP-A-63-163013 (JP, A) Actual opening 58-30012 (JP, U) Actual opening 4-60667 (JP, U) Actual public opening 4-49367 (JP , Y2)

Claims (1)

(57) [Claims] 1. A strip plate made of a soft synthetic resin is screwed by screwing means provided at regular intervals to hold and hold drilling screws in a planted state, and the strip plate is mounted on an automatic screwdriver. While engaging the feeding means provided on the strip plate with the driving device on the automatic screw driving machine to intermittently drive the screw at a constant feeding pitch, the drilling screw is mounted on the automatic screw driving machine with the axial center of the driver bit installed. A screw supply belt for sequentially supplying to the tip side and pushing out a drilling screw whose head is engaged with this driver bit from the screw insertion means of the belt-like plate by rotational driving force to perform screw fastening to the fastening member, The screw insertion means is provided with a bottomed cylindrical boss formed by an outer peripheral wall protruding toward the lower surface side of the strip plate and the bottom plate, and the cylindrical boss has an upper opening end edge of the screw head. Outside the middle part The inner diameter of the outer peripheral wall forms a guide hole for accommodating a part of the head of the screw in a manner of supporting the screw insertion hole, and the screw insertion hole into which the screw shaft is inserted is concentric with the guide hole in the bottom plate. The strip-shaped plate is provided with a radial groove hole extending radially outward from the maximum diameter of the screw head from the guide hole, and the inner end and the upper end side of the radial groove hole are communicated with each other. Then, the lower end side is terminated immediately before the bottom plate, and a longitudinal slot is formed in the outer peripheral wall of the cylindrical boss, and the cylindrical boss is removed from the portion of the longitudinal slot by the screwing thrust of the driver bit against the drilling screw. A screw supply belt characterized in that the cylindrical boss is expanded and broken so that the terminal end of the vertically elongated groove and the screw insertion hole communicate with each other.