JPS6026922Y2 - Screw feeding device for driver tools - Google Patents

Description

[Detailed description of the invention] The present invention uses screws that are pre-implanted in a row at regular intervals in a synthetic resin belt at the tip of an electric or pneumatic dry blower for screwing screws into a mating member. , relates to a device that automatically feeds screws one by one in accordance with the screwing operation.

The conventional screw feeding device disclosed in U.S. Pat. A ratchet mechanism is provided on a pair of left and right feed wheels to feed the belt, and both feed wheels are intermittently rotated via the ratchet mechanism in conjunction with the movement when pressing the dry blow tool against the mating member. - By pitch feeding, the screw on the belt was automatically fed to the tip of the driver bit in the dryer bit.

That is, this known screw feeding device automatically feeds screws by intermittently rotating the feed wheel using motion during the pressing when pressing the dry blowing tool against the mating member. Therefore, when pressing the dry bit, the screw should be supplied to the tip of the driver bit before the tip of the driver bit approaches the belt.In other words, the driver bit of the dry bit should be pressed against the belt. A feed stroke for intermittently rotating the feed wheel by l pitch must be provided at the beginning of the stroke before the driver bit approaches the belt. The distance must be equal to the screw-in stroke from engaging the head of the screw to penetrating the belt and screwing the screw into the mating member, plus the above-mentioned feed stroke, and a long pressing becomes a stroke. Therefore, the screw feeding device attached to the tip of the dry blowing tool is large and heavy, and in addition to the long stroke of the pressing device, the feeding device is heavy and difficult to handle manually, making it difficult to screw in. This resulted in a decrease in workability.

Therefore, the inventors of the present invention used a screw feeding device attached to an electric or pneumatic drying tool as shown in the above-mentioned U.S. patent specification to feed a belt with screws embedded at regular intervals. When feeding screws one by one to the tip of the driver bit of the dry bait tool by intermittent rotation of the wheel, the feed wheel that engages with the belt is pressed by the mating member rather than the stroke. After the screw is screwed in, when it is released from the mating member, it is related to the return stroke, and at the end of the return stroke, the pitch is rotated intermittently, thereby reducing the pressing stroke, making it smaller and lighter, and improving the workability of screwing. A screw feeding device aiming at this was proposed in Japanese Utility Model Application No. 56-24867 and Japanese Utility Model Publication No. 59-4102.

The present invention is an improvement on the screw feeding device according to the prior application, so that screws of different lengths can be screwed in with one device.

In other words, this type of screw feeding device has a fixed nosepiece that comes into contact with the mating member at its tip, and the belt is connected between the nose piece tip end surface (the surface that comes into contact with the mating member) and the driver bit. This device supplies the screws that have been implanted, and there is a screw between the tip of the driver bit that holds and guides the belt with the screws implanted, and the tip surface of the nosepiece (the surface that contacts the mating member). While it is necessary to form a gap that allows the screws to be fed sequentially without contacting the mating member, the screws that are screwed into the mating member have various lengths depending on the thickness of the mating member, etc. Therefore, if the gap between the holding and guiding portion of the belt and the tip of the nose piece is set to match a long screw, it will reduce the time it takes to complete screwing when handling short screws. In view of this, the push-in stroke increases and work efficiency decreases, and if the gap is set to suit a short screw, it cannot be applied to a long screw. The nose piece attached to the tip of the screw supply device is configured so that the attachment position can be adjusted freely in the pressing and stroke direction, in other words, the gap between the holding guide part of the belt and the nose piece tip surface can be adjusted. This eliminates the above-mentioned inconvenience and allows for the adjustment to be made extremely easily and reliably.

The drawings of the embodiments will be explained below. In the drawings, 1 is an electric or pneumatic type dryer tool which has conventionally been widely available on the market. A chuck portion 7 is provided inside the mounting screw portion 4 and is rotatably driven when a switch 6 in the nozzle portion 5 is turned on. A driver bit 8 having a diameter 8' is bayonetly mounted.

Reference numeral 9 denotes a belt made of soft synthetic resin in which drill screws 11 for screwing into a mating member 10 are implanted in a row at an appropriate constant gap P, and on both longitudinal edges of the belt 9, drill screws 11 are installed.
A notch 12 is provided at an intermediate position around the drill screw, and a plurality of cutting lines 13 are provided on the belt 9 radially from the insertion hole of the drill screw, and the drill screw 11 is inserted from the head toward the shank. By pressing, the drill screw 11 can be easily removed from the belt 9.

Reference numeral 14 denotes a screw supply device, and the device 14 has a female screw 1 screwed into the mounting screw portion 4 of the drying tool 1.
The adapter 15 is made of a cylindrical adapter 15 made of synthetic resin such as polyacetal resin and has an inner circumference of 5', and a sleeve-shaped case 16 that is slidably fitted on the outside of the adapter 15. The driver bit 8 is screwed into the mounting threaded part 4 so as to fit therein, and is fixed at an appropriate position in the axial direction by a lock nut 17 which is threaded into the mounting threaded part 4. Long groove holes 18 and 19 having an appropriate length L□ are bored in the axial direction on both the left and right sides of 16, and both groove holes 18 and 19
Guide pins 20 and 21 slidably inserted into case 1
By implanting the adapter 15 in the adapter 6, the adapter 1
5 is configured to reciprocate within the case 16 by a distance of the length Ll of the long slot 18. A spring 22 is provided to ensure that the guide pin 20.21 is in the circumferential groove 1 when the adapter 15 is fully protruded.
B, starting end 18' of 19;

19' so that it does not protrude any further.

A feed shaft 25 perpendicular to the axis of the driver bit 8 is attached to a pair of left and right brackets 23 and 24 attached to the front end surface of the sleeve-like case 16.
A pair of feed wheels 26 and 27 are integrally supported on the feed shaft 25 between both brackets 23 and 24 at the same interval as the width S of the belt 9. The feed shaft 25 and both feed wheels 26.27 are made of synthetic resin such as polyacetal resin, and on the outer periphery of both feed wheels 26.27, there is a protrusion 28 that engages with the notch 12 in the belt 9. A plurality of leaf springs 29 are provided at the same intervals as the notches 12 along the outer peripheries of both the feed wheels 26 and 27, and plate springs 29 whose base ends are fixed to the sleeve-like case 16 with screws 30 are tangentially pressed into contact. The arrangement is such that both wheels 26 and 27 are allowed to rotate in the direction of arrow A and are prevented from rotating in the opposite direction.

At the tips of both brackets 23 and 24, belt guide parts 23' and 24', which are bent inward, are provided in a direction substantially perpendicular to the axis of the driver bit, and the belt 9 is guided through these belt guide parts 23' and 24'. , 24' from the rotating direction of both feed wheels 26, 27, and insert the protrusions 2 of both feed wheels 26, 27 into the notches 12 of the belt 9.
8 are engaged, while the belt 9 is disengaged from both feed wheels 26.27 by means of a guide body 31.32 made of a plate spring on the exit side from both feed wheels 26.27, and both brackets 23.24 As will be described in detail later, a nose piece 33 having a U-shaped cross section is fitted onto the tip of the nose piece 33 and attached using four screws 34.

Further, at the end of the shaft where the feed shaft 25 protrudes from one bracket 23, a protrusion 2 of the feed wheel 26, 27 is provided.
A ratchet wheel 35 having the same number of teeth 36 as 8 is fitted, and a feed rod 37 is disposed in the axial direction of the case 16 on the side surface of the sleeve-like case 16 on the side of the long slot 18. The feed rod 37 is supported slidably in the axial direction of the case 16 by a pair of guide members 38 and 38 fixed to the sleeve-like case 16.The tip of the feed rod 37 engages with the teeth 36 of the ratchet wheel 35. A ratchet pawl 40 having a pin 39 is rotatably attached to the pin 41, and the ratchet pawl 40 is mounted on the feed rod 37 by a torsion spring 43 wound around a pin 42 installed on the side of the feed rod 37. The pin 39 of the ratchet pawl 40 is pressed against the stopper pin 44 of the ratchet wheel 3 in this state.
On the other hand, the feed rod 37 has a long groove hole having a length L2 that is appropriately dimension 1 shorter than the long groove hole 18 of the sleeve-like case 16 along the sliding direction thereof. 45, and insert the guide pin 2 into this long slot hole 45.
0 by slidably inserting the adapter 15.
During the pushing stroke into the sleeve-shaped case 16, the guide pin 20 comes into contact with one end 45' of the long slot 45 in the feed rod 37, thereby moving the feed rod 37 forward and causing the return stroke of the adapter 15 to move forward. On the way, the guide pin 20 touches the other end 4 of the long slot 45 in the feed rod 37.
5'', the feed rod 37 is moved back to its original position.

When attaching the nose piece 33 to both brackets 23.24 with four screws 34, both brackets 23.24 have female screw holes (tapped holes) 46 into which the mounting screws 34 are screwed. while drilling a screw hole 4 in the nose piece 33 into which the mounting screw 34 is fitted.
7 is formed into an L-shaped hole that extends an appropriate length along the axis of the driver bit 8, that is, in the direction of the driver bit 1, and then communicates with the lateral groove 47'' in a direction substantially perpendicular to the axis of the driver bit 8. By this, both brackets 23.2
4 screws 34.
The attachment can be changed between the position where the screw fits into the starting end 47' of the L-shaped screw hole 47 and the position where the four screws 34 fit into the horizontal groove 47'' of the L-shaped screw hole 47. It is.

A passage hole 48 for the drill screw 11 is bored at the tip of the nose piece 34, and contact pieces 49.degree. 49 made of synthetic resin are provided on both sides of the passage hole 48.

Further, the adapter 15 is provided with an inner flange 50 on the inner periphery, and the driver bit 8 has a stopper collar 51 having a larger diameter than the inner diameter of the inner flange 50 and a set screw 52 at a position close to the inner flange 50. It is fixed at .

In this configuration, the belt 9 in which the drill screws 11 are implanted in a row is loaded so as to be wound around the feed wheels 26, 27 of the screw feeding device 14 as shown in FIG. After pressing the nosepiece 34 to a predetermined screwing position on the mating member 10 (which is held along the side surface of the sleeve-like case 16 by a guide piece 53 provided on the side surface of the sleeve-like case 16), By pressing the driver bit 8 toward the mating member 10 in the direction of arrow B while rotating, the driver bit 8 and the adapter 15 move forward while compressing the spring 22 in the sleeve-shaped case 16.
When the retaining part 8' at the tip of the driver bit 8 engages with the engagement groove in the head of the drill screw 11 on the belt 9 that has been supplied in advance in front of it, and the pressing progresses further, the driver bit 8 penetrates the belt 9 and presses the drill screw 11 against the mating member 10 while rotating, so that the drill screw 11 presses against the mating member 10 as shown in FIG.
This pressing occurs during the stroke when the guide pin 2 installed in the adapter 15
0 comes into contact with the long groove hole 45 in the feed rod 37, the feed rod 37 moves forward toward the ratchet wheel 35, and then when the feed rod 37 moves backward, the ratchet pawl 40
The pin 39 of is now ready to engage the teeth 36 of the ratchet wheel 35.

When the screwing of the drill screw 11 into the mating member 10 is completed in this way, the driver bit 8 and the adapter 15 are moved to the guide pin 20 by the repulsive force of the spring 22 by moving the dry blow tool 1 backward in the direction opposite to the arrow B. .21 is the starting end 18', 19' of the long slot 18.19
Near this backward movement, the guide pin 20 comes into contact with the other end 45'' of the slotted hole 45 in the feed rod 37, causing the feed rod 37 to move toward the ratchet wheel. 35 from the forward position to the original position.

As the feed rod 37 moves backward, the pin 39 of the ratchet pawl 40 at its tip engages with the teeth 36 of the ratchet wheel 35 and rotates it one pitch. , 27 by -pitch, feed the belt 9 by one pitch P, and set the next drill screw 1.
1 is automatically supplied onto the axis of the driver bit 8.

That is, to press the drying tool 1 against the mating member 10, the ratchet pawl 40 is moved forward relative to the ratchet wheel 35 during the stroke, and during the return stroke after screwing is completed, the ratchet pawl 40 moves the ratchet wheel 35 forward. 35 and the feed wheels 26 and 27 are rotated by -pitch to supply screws, so that the pressing of the drying tool 1 against the mating member 10 occurs during the stroke, as in the U.S. Pat. There is no need to provide a screw, the pressing stroke is shortened, and the screw feeding device can be made smaller in diameter and lighter in weight.

Then, the shank length of the drill screw 11 in the belt 9 increases from hl to h2, and this long drill screw 11
When screwing into the mating member 10, the mounting position of the nose piece 34 with respect to both brackets 23, 24,
Loosen the mounting screw 34 and remove the 13th screw 34.
As shown in the figure, the distance from the belt guides 23', 24' to the mating member 10 is changed so that the mounting screw 34 fits into the horizontal groove 47'' in the L-shaped screw hole 47. The distance H1 at the position where the nose piece 34 is fitted into the starting end 47' of the brackets 23 and 24 can be increased in accordance with the distance standard. Since the position can be adjusted, the gap distance from the belt guide part to the mating member can be adjusted to match the length of the screw 11 to be screwed in, so when screws of different lengths are used, screwing is completed easily. The stroke increases when pressing up to
Or without being unable to fit long screws.
One screw feeding device can be adapted to several types of screws.

When changing the mounting position of the nosepiece 33 as described above, the present invention makes the screw hole 47 into which the mounting screw 34 of the nosepiece 33 fits into an L-shape, so that when handling a short screw, the mounting screw 34 can be changed. into the starting end 47' of the screw hole 47,
By fitting the mounting screw 34 into the lateral groove 47'' of the screw hole 47 when handling long screws, the nosepiece 33 can be attached to the bracket 23 in any mounting position.
．． 24 through the mounting screw 47, so even if the mounting screw 47 is loosened somewhat, the mounting position of the nose piece 33 changes in the direction of contraction during the screw-in operation. There is absolutely no need to do this, and the predetermined mounting position can be maintained reliably.Moreover, the mounting position can be changed by loosening the mounting screw 34 (there is no need to remove the mounting screw 34). The mounting screw 34 is attached to the starting end 47' of the screw hole 47 or the horizontal groove 47''.
After moving it so that it fits, all you have to do is loosen and install the mounting screw 34, and the change can be made extremely easily.

In this case, the screw hole 47 into which the mounting screw 34 is fitted may be provided on the bracket 23.24 side, or the screw hole 47 may be inserted into the horizontal groove 4 as shown by the two-dot chain line in FIG.
If the 7" is made into an F type with two parts, the mounting position of the nose piece can be changed to three stages, and in the same way, the horizontal groove part 47
``The number of stages in which the mounting position of the nosepiece can be changed can be increased according to the number of steps.

Furthermore, if the shape of the tip of the nose piece 33 is formed into a narrow rectangular shape, even if the mating member 10 is a corrugated plate as shown by the two-dot chain line in FIG. 3, the screw can be screwed into it. be able to.

Therefore, according to the present invention, the screw feeding device attached to the drying tool can be made smaller and lighter, and the pushing stroke can be shortened, making it easier to handle and improving the workability of screwing. It is possible to adapt and handle screws of different lengths while maintaining the condition of
This has the effect that the adjustment position does not change during the screwing operation, allowing the screwing operation to be carried out with peace of mind.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is an overall view of the screw feeding device when it is attached to a drying tool, Fig. 2 is a front view of the screw feeding device, and Fig. 3 is a partial cutaway of Fig. 2. A plan view, FIG. 4 is a sectional view taken along IV-IV in FIG. 2, FIG. 5 is a sectional view taken along V-V in FIG. 2, FIG. Figure 8 is a sectional view taken along ■-■ in Figure 3; Figure 9 is a partially cutaway front view when the threaded belt is loaded into the screw supply device; The figure is the X-X cross section of Figure 9, Figure 11 is a diagram showing the state when screwing is completed, Figure 12 is a perspective view showing the disassembled state of the bracket and nosepiece, and Figure 13 is the difference in length. FIG. 4 is a cross-sectional view when adjusted to handle a double screw. 1...Dry bait tool, 4...Mounting screw part, 7...Chuck part, 8...Driver bit, 9...Belt , 11...
Screw, 15...Adapter, 16...Sleeve-shaped case, 22...Spring, 23, 24.
...Bracket, 23', 24'...Belt guide section, 25...Feed shaft, 26.27.
...Feed wheel, 35...Ratchet wheel, 37...Feed rod, 40...Ratchet pawl, 20...Guide pin, 45...・・・・・・
・Long slot, 33...Nose piece, 34...
...Mounting screw, 47...Screw hole, 47'.
...Starting end, 47″...Horizontal groove part.

Claims (1)

[Scope of utility model registration request] A cylindrical adapter that is screwed into a threaded part formed on the outer periphery of a chuck part for attaching a driver bit in a drying tool, a sleeve-shaped case that is slidably fitted to the adapter, and the sleeve-shaped case that protrudes from the adapter. The bracket, which is attached to the tip of the sleeve-like case, has a guide portion that guides a belt in which screws are pre-installed in a row in a direction substantially perpendicular to the axis of the driver bit. The bracket is provided with a feed wheel that feeds the belt at intervals of screws, and a ratchet wheel that is interlocked with the feed wheel so that the axis of the screw in the belt fed to the feed wheel is aligned with the axis of the screw of the driver bit. On the other hand, the sleeve-shaped case is provided with a feed rod slidably in the axial direction of the case, and the feed rod is connected to the adapter so that when the adapter moves forward, it moves forward toward the ratchet wheel. ,
The feed rod is provided with a ratchet pawl that is associated with the adapter so as to move backward from the forward position with respect to the ratchet wheel when the adapter moves backward, and that the ratchet pawl is configured to intermittently rotate the ratchet wheel by the distance between the screws in the belt during the backward movement. and attaching a nosepiece to the tip of the bracket, which contacts a mating member for screwing the screw in the belt, with a mounting screw that fits into a screw hole drilled in one of the bracket or the nosepiece. and the screw hole extends in the direction of the driver bit along the axial direction of the driver bit, and a lateral groove substantially perpendicular to the axis of the driver bit communicates with the screw hole.