JPH0249870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic driving machine for fastening parts such as screws, and more particularly to a head of an automatic screwdriving machine that automatically feeds and drives screws using a strip in which a large number of screws can be removed and arranged side by side.

Automatic driving machines that drive fixed parts such as screws while automatically feeding them into a head are already known. For example, a screw driver uses a strip made of a flexible material, such as synthetic resin, on which a number of screws are placed side by side at predetermined intervals, and the screws are fed by this strip. The strip, which removably holds a number of screws at predetermined intervals, is guided through the strip feeding mechanism of the automatic screw driver head.
Stop feeding the strip when the screw held in the strip is in line with the bit of the screw driver. The operator completes the screw driving operation by simply pressing the head of the machine against the object to be screwed, and when the pressure is released, the strip is fed so that the next screw is aligned with the bit. Such a screw driver is convenient because the operator only has to press the head against the object.

In this automatic driving machine, it is important that the axes of the bit and screw match, and if they are misaligned, the screw will not be driven in the correct position, which will not only result in incorrect driving but also cause the tool to This may also cause the screw to become jammed in the head.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic fixed part driving machine in which a fixed part such as a screw driven from a strip is driven in a state in which the fixed part is aligned with the axis of a bit.

To achieve this objective, the present invention utilizes a retaining strip that removably retains fixed parts, such as screws, spaced at regular intervals on an elongated flexible material, and a guide portion of the strip. A bit formed in the head and extending from the main body drives the fixed part into the object by pushing the head, and in the return stroke of the head, the strip is automatically fed so that the next fixed part is placed at the driving position. In the now-defunct automatic driving machine for fixed parts, a pair of chuck members biased by springs are provided at the tip of the head, which forms a passage through which the fixed parts are driven into the object by a bit. A spring force is applied to the chuck member such that the fixed part pushed out by pushing the bit is once gripped by the chuck member and then driven into the object by the strong pushing force of the bit. each of the chuck members has a mutually symmetrical shape, and a regulating member that abuts each tip of the chuck member biased by the spring is fixed to a side surface of the tip of the head facing the driving path;
The present invention provides an automatic driving machine, characterized in that the regulating member is provided at a position that regulates each tip of the chuck member to be arranged symmetrically with respect to the central axis of the driving passage. This allows the chuck to grasp the stuck part that has separated from the strip so that it aligns with the axis of the bit, and drive the stuck part in its proper posture.

For convenience of explanation, preferred embodiments of the present invention will be described below with reference to the drawings, using screws as a representative fixing component, but it goes without saying that the invention can also be applied to other fixing components, such as nails. An automatic screw driver 1 generally shown in FIG. 1 has a motor (not shown) built into a main body 2, and a switch 4 on a handle 3 controls the drive of the motor, and a switch 5 controls the drive of the motor. Select forward or reverse rotation. A clutch part 7 is provided between the nose 6, which has a built-in bit for driving a screw, and the main body 2, and controls the rotation of the motor.
A clutch is provided to control the transmission to the bit. Attached to the nose 6 is a driving head 10 that automatically feeds a strip 9 that holds screws 8 at predetermined intervals and drives the screw into a predetermined object with a bit. Magazine 1 stored in a coil shape
1 is installed.

The strip 9 used in this automatic screw driver 1 is shown in detail in FIGS. 1A and 1B. The strip 9 is made of flexible material such as synthetic resin,
As shown in the figure, the upright tabs 12 are provided only on one edge, unlike the conventionally frequently used tab pairs provided at predetermined intervals on both edges. By forming it in this way, it is possible to use a short fixed part without being constrained by the length, compared to conventional methods that require a fixed part length that is longer than the distance between the pair of tabs, that is, the width of the bottom surface of the strip. It will be possible to keep it even if it happens.

The tab 12 is provided with a round hole 13 in its center for holding the screw 8, and a guide groove 14 at the end that widens toward the tip for mounting the screw in the hole 13.
is provided. The screw 8 is passed through this groove 14 and, by being pushed in, is held in the strip as shown in FIG. 1B. This screw can also be removed by external force due to the flexibility of the strip. The hole 15 at the center of the strip has the function of a strip feed hole for engaging the feed pawl of the head 10 to feed the strip, and the function of a cutting line for cutting off the used portion.

FIG. 2 shows a side view of the head 10 of the screw driver. The head 10 is fixed to the nose 6 of the screw driver 1 by screws 21. The clutch portion 7 between the nose 6 and the main body 1 includes two clutch plates 22,
23, and one plate 22 is connected to the rotating shaft of the motor of the main body 1. A shaft is connected to the other plate 23 and extends in the nose direction, and a bit 24 extends into the head 10 and is connected to the tip of the shaft. A spring 25 is provided between the clutch plates 22 and 23, and when the clutch plates 22 and 23 are inactive, the plates are separated and the rotation of the motor is not transmitted to the bit.
The bit is pushed to the right in Figure 2 and the spring 25
When the protrusion 26 of the clutch plate 23 presses the plate 22
and 23 are engaged, and the bit 24 rotates.

The head 10 is provided with an automatic strip feeding mechanism. This automatic feeding mechanism is also shown in FIG. 3, so please refer to it as well. Upper and lower edges 33 and 34 of the housing 32 to which a mounting block 31 with screws 21 for fixing to the nose 6 is fixed.
is bent inward to form a rail for the guide groove 36 of the tip block 35 of the head 10, and supports the tip block 35 in a slidable manner. The mounting block 31 has a lower extension 37 in which a magazine 11 containing the screw strip 9 in a coil is mounted.

A spring 38 is provided between the housing 32 and the tip block 35, and constantly presses the block 35 toward the tip. The reason why the block 35 is held in the housing 32 against the pressing force of the spring is that the pin 39 attached to the block 35 shown in FIG.
This is because it is locked at the 0 end. The pin 39 is attached to the tip of an arm 41, and the other end of the arm is pivotably attached to the intermediate position of a link arm 43, which has a pawl 442 at the tip that engages with the feed hole 15 of the strip. The link arm 43 is formed in an "L" shape, is pivotally attached to the tip block 35 by a pin 44, and the other rear end is pressed by a spring 45 attached to the block 35, and the claw 42 Block 35 long hole 4
Position it above 6. The pawl 42 extends through an elongated hole 46 to engage a feed hole in the strip 9 fed into the guide groove. Arms 41 and 43 form a toggle mechanism so that the block 35
When pushed in the direction shown in FIG. 3), the pin 39 moves the elongated hole 40 to the left in FIG. 3 and comes into contact with the left end. When the block 35 is further pushed, the arm 41 is raised against the upward pressing force of the arm 43, and the claw 42 is moved downward away from the feed hole 15 of the strip, as shown in FIG. 3A. When block 35 is pushed further, arm 41 collapses into another stable position, i.e. in the opposite direction to that shown in FIG. This angle of inclination is regulated by the wall of the recess 47 of the block 35, which accommodates the link mechanism. Therefore, the claw 42 at the tip of the arm 43 can be moved only slightly upward, in effect.
It remains in the lower position. In this position, the claw 42
is engaged in the next feed hole 15 of the strip 9. When the pressure on the tip block 35 is released, the resilient force of the spring 38 pushes the block 35 toward the tip, and the pin 39 connects the elongated hole 40 to the third A.
It moves to the right in the figure and comes into contact with the end of the elongated hole to raise the link 41, returning to the position shown in FIG. 3. At this time, the claw 42 of the arm 43 moves upward, thereby automatically feeding the strip 9. The pawl 42 is formed in a hook shape so that it locks into the feed hole 15 and feeds it only when moving upward, and loses its locking action when moving downward.

The automatic screw driver is equipped with a screw depth adjustment mechanism. Gauge plate 49 of tip block 35
and a locking screw 49' which adjustably supports this. The gauge plate 49 has a long hole 49'' provided diagonally, and can be moved diagonally upward or diagonally downward by loosening the lock screw 49'.When the gauge plate 49 is moved downward, the plate The rear end protrudes rearward from the rear end of the tip block, so that even if the tip block is pushed strongly, the rear end of the tip block will not touch the mounting block 3.
The rear end of the gauge plate comes into contact with the gauge plate before it comes into contact with the gauge plate 1, and the pushing depth of the tip block is limited. On the other hand, the bit gradually moves to the tip due to the screw driving operation,
When the screw enters a certain depth or more, the clutch plate 2
3 becomes weaker and the spring 25 disengages the clutch. Therefore, by adjusting the gauge plate 49, the housing 3 of the tip block 35 can be adjusted.
The relative movement distance to 2 can be adjusted.

Details of the tip block 35 of the head 10 will be explained with reference to FIGS. 4 to 6. The tip block is provided with a strip guide groove 50, which extends vertically in FIG. 4. Along this groove, a strip 9 fitted with a screw 8 is fed from the bottom to the top in FIG.
As shown in FIG. 5, a flat plate member 51 is provided that extends parallel to the bottom of the guide groove 50 from the tip of the tip block at an interval corresponding to the thickness of the strip 9. The tip of this plate member terminates at a distance of the thickness of the strip from the upright side wall of the guide groove, and its shape tapers so as to abut sharply against the hinge of the tab 12 standing upright from the strip 9. It is preferable to do so. This flat plate member acts as a restricting means for causing the tab to stand upright from the strip by moving the strip along the bottom surface of the guide groove and also moving it along the upright wall of the guide groove of the tab 12. This flat plate member 51 has a guide groove 50
It is preferable that the upper surface of the groove be provided along the groove.
Further, at the portion where the flat plate member 51 intersects with the driving path 53 of the screw 8, the tip portion 52 is formed to be thinner than the other portion as shown in FIG. Form an escape recess. Further, as shown in FIG.
1' has a step in the direction away from the guide groove.
This is because the shoulder portion 51'' comes into contact with the side edge of the tab 12 that has fallen down due to the pushing of the screw 8, so that the strip 9 does not move backward even when the claw 42 retreats.
This is preferable because it acts as a reverse movement prevention mechanism, and it is also preferable because it creates a place for the strip to escape when the claw 42 moves backward while pushing the strip 9.

The flat plate member 51 regulates the strip 9 to follow the guide groove as described above, but also
The strip guide passage also has the function of separating the strip and the screw 8, so that the shank of the screw 8 slides along the upper surface of the flat plate member, so that its movement is smooth. A cover member 55 for forming a screw guide path is also provided on the upper surface of the flat plate member 51. This cover member covers almost the entire tip of the tip block 35, and is formed into a semi-cylindrical shape at the portion where the passage intersects the guide groove 50 so as to form a screw driving passage 53 (the fourth and Figure 6).

A strip check member 56 is provided in the guide groove 50 of the cover member 56 on the side closer to the strip insertion hole than the screw driving passage 53 (fourth and sixth strip check members).
figure). This check member is pivotally supported by a pin 57 and spring biased by a coil spring 58. This member 56 is provided with a protrusion 59 whose upstream side is gently inclined in the strip guiding direction and whose downstream side forms a part of the screw driving passage, and a stop portion 60 is provided at the tip of the member to guide the screw of the protrusion 59. Preventing further entry into the road. Because the check member 56 is formed in this way, the screw held by the strip fed from the inlet portion 61 pushes up the upstream slope of the protrusion 59 and easily enters the screw driving passage 53, but the claw 42 Even when the screw 8 moves backward, the screw 8 comes into contact with the downstream side surface and prevents further backward movement. Therefore, while the screw 8 is held in the strip,
This check member 56 prevents the strip from moving backwards after the screw 8 has been removed and moved to the tip, by the shoulder 51'' of the flat plate member 51.

The entrance portion 61 of the strip guide groove is flared outward on each side to facilitate the entry of the strip, especially the entrance portion 61 of the side wall where the tab 12 abuts.
2 is inclined so that the tab, which normally does not stand upright and opens at a pure angle, smoothly turns into an upright state. Further, a strip presser 65 is provided on the downstream side of the screw driving passage in the guide groove 50, and the tip thereof is tapered to fit into the feed hole 15 of the strip. This tapered shape allows the unnecessary strip to be cut out using its feed hole 15 as a breaking line.

As shown by the broken line in FIG. 4 and in FIG. A chuck member 70 is provided which is formed symmetrically with respect to each other. The tip 72 of the chuck member has an inclined countersunk hole on the upstream side in the screw driving direction, a hole with a diameter slightly smaller than the shaft diameter of the screw 8 in the center, and a circular concave on the outer surface. A place 74 is provided to hold the washers W there. It is preferable that the washer W expands outward for insertion into the recess.

The spring 73 has such a biasing force that it once grips the screw pushed in by the bit and then passes through the screw head due to the subsequent strong pushing force.
By doing this, it fits into the tip of the bit receiving hole in the head of the screw. This is because the pushing force of the bit onto the screw acts to slightly rotate it according to the lead angle of the screw. Further, the axis of the screw holding hole 75 of this chuck coincides with the central axis of the screw driving passage 53. That is, a pair of symmetrically formed chuck members 70,
The tips 72, 72 of 70 include the screw holding hole 75, and are regulated to be arranged symmetrically with respect to the central axis of the driving passage 53. For this reason, the driving path 53 of the tip block 35 of the head 10
A member or pin 77 is provided on the side surface facing the chuck member for abutting against each tip 75 of the chuck member biased by a spring 73 to regulate the position of the tip (see FIGS. 5 and 7). ). This pin 77 has a tip 72 of each chuck member connected to the screw holding hole 75 with the center axis of the screw driving passage 53 as a reference.
The pin 77 is fixed at a position that regulates the symmetrical arrangement, and the pin 77 is connected to the driving path 53.
It is short enough not to obstruct the screw passing through it.
Instead of this pin 77, a projection may be provided on each chuck member, and the block 35 may be provided with a predetermined limiting wall or shoulder.

During screw driving work, the operator must use the guide groove 5.
Strip 9 holding the screw from the inlet 61 of 0
along the guide groove and drive the first screw into the driving passage 53. After completing this preparation,
Press the chuck at the tip of the head against the target P (Figures 7 and 7A) to be hit. When the tip block 35 is pushed, the screw 8 hits the tip of the bit, and when pushed further, the screw 8 is removed from the strip 9. When pushed further, the tip block approaches the main body, and at the same time, the bit 24 pushes the screw 8 and enters the opening 75 of the chuck member 70, aligning the axis of the screw with that of the bit. Therefore, the screw will not lose its correct posture. During this time, the hook 42 of the strip feed mechanism is moving toward the next strip feed hole 15. On the other hand, the screw held in the chuck is
When the bit tip is engaged with the receiving hole of the screw head due to the strong pushing force of the bit, the object P
Then, it comes into contact with the washer W held at the tip of the chuck. This is pushed even harder, and the clutch 7 is now in the connected state for the first time, the bit rotates as shown in FIG. 7A, and the screw 8 is driven into the required location. After driving is completed (Fig. 7B), when the pressing force of the screw driver is released, the tip block moves away from the main body, and at this time, the strip 9 is advanced and the next screw is placed in its driving path, and the next screw is Preparation for punching work is completed. The same process is repeated for the next operation.

According to the present invention, when automatically driving the strip, the posture of the fixed part is proper, and therefore the driving is performed reliably and properly.

[Brief explanation of drawings]

Fig. 1 is an overall side view of an automatic screw driver to which the present invention is applied, Figs. 1A and 1B are perspective views illustrating a screw holding strip used in the screw driver of Fig. 1, and Fig. 2 is a screw driver. A partially cutaway side view showing the tip of the machine; FIG. 3 is a partially cutaway side view showing the strip feeding mechanism of the screw driver; a partially cut side view from the back of FIG. 2;
Fig. 3A is a partially exploded side view showing the strip feeding mechanism in a different position from Fig. 3, Fig. 4 is a side view showing details of the tip of the head of the screw driver, and Fig. 5 is the same as Fig. 4. 6 is a sectional view taken along the line, FIG. 6 is a sectional view taken along the - line in FIG. 4, and FIG.
A line sectional view, FIG. 7A is an explanatory diagram showing how the screw is driven, and FIG. 7B is a side sectional view showing the state of the screw after driving is completed. 1... Automatic screw driver, 6... Nose, 7...
Clutch part, 8...Screw, 9...Strip, 1
0...Head, 11...Strip storage magazine, 12...Tab, 22, 23...Clutch plate,
24...Bit, 32...Head housing, 3
5...Head end block, 37...Mounting block, 39...Pin, 41, 43...Toggle arm, 42...Claw, 50...Strip guide groove,
51... Flat plate member for strip regulation, 53... Screw driving passage, 55... Cover member, 56...
Strip feeding check member, 59... protrusion, 70...
...chuck member, 74...recess, 77...pin.

Claims (1)

[Claims] 1 A holding strip consisting of a long flexible material that removably holds fixed parts such as screws arranged at regular intervals is used, and the guide part of the strip is formed in the head and extends from the main body. In an automatic fixed part driving machine, the fixed part is driven into an object by pushing the head, and the strip is automatically fed during the return stroke of the head so that the next fixed part is placed at the driving position. A pair of spring-biased chuck members are provided at the tip of the head, which forms a passage through which the fixed part is driven into the object by a bit, so as to come into contact with each other. A spring force is applied to the chuck member such that the part is once gripped by the chuck member and then driven into the object by the strong pushing force of the bit, and the chuck members are A regulating member having a symmetrical shape and abutting each tip of the chuck member biased by the spring is fixed to the side surface of the tip end of the head facing the driving path, and each tip of the regulating member and the chuck member is fixed to the side surface of the tip of the head facing the driving path. An automatic driving machine characterized by being installed at a position that regulates the arrangement to be symmetrical with respect to the center axis of the insertion passage.