JPH03166064A - Screw driving device - Google Patents

Abstract

PURPOSE:To drive a screw correctly in the driving center of the member to be driven even in the case of driving a long screw in about 5cm, by respectively fitting a screw holding member to the right and left leg parts with its spring energizing to a screw interposing side by facing to the screw passage of a sliding member. CONSTITUTION:A screw 13 transferred under a driver bit 30 and interposed at its midway part by the right and left screw holding member 36, 44 is held straight in the screw driving direction by these screw holding members 36, 44. In this state the rotating tip of the driver bit 30 is engaged with the engaging groove of the screw 13 head part on the way of the stroke of pushing in action of a sliding member 5 and the screw 13 released from a screw holding belt 14 is driven into the member 29 to be driven just as being held in the driving direction by the holding members 36, 44.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a screw driving device that is attached to a driver tool and can continuously drive screws installed in a screw holding belt one by one. In particular, it relates to a screw driving device in which a sliding member is provided with a screw holding mechanism to hold the screw sent under the driver bit straight in the driving direction. (Prior art) When connected to an electric driver tool, the driver tool is pushed into and returned from the workpiece.
Various screw driving devices have been proposed that drive screws while continuously supplying the screws installed in a screw holding belt one by one.

As shown in a conventional example in FIG. 13, this screw driving device has a cylindrical sliding guide case 73 attached to the tip of an electric screwdriver tool 7l via a connecting member 72, and a sliding member into which a screw holding belt is loaded. 74 is fitted into the case 73 via a return spring 75 so as to be vertically slidable. The belt loading portion of the sliding member 74 is provided with a sprocket that engages with the screw holding belt and a ratchet wheel that engages with the sprocket. This ratchet wheel rotates the subrocket when the sliding member 74 is pushed into the case 73 and the pin 76 protruding from the ratchet wheel passes through the inclined part 78 of the slit 77. This action causes the screw holding belt to rotate. - Only the thread section is transported.

At this time, if the leg portion 79 at the tip of the sliding member 74 is brought into contact with the driven member 80 and the sliding member 74 is further pushed into the case 73, the screw is driven into the driven member 80 by the driver bit driven by the driver tool 7l. can be typed into. Note that when the sliding member 74 is returned by the biasing force of the return spring 75, only the ratchet wheel idles and is returned to its original state.

[Problems to be Solved by the Invention] By the way, with the above-mentioned conventional screw driving device, when the screw length of the screw to be driven is long, for example, about 5 cm, the screw cannot be driven straight into the member to be driven, and the screw may deviate from the driving center. There was a problem that the screws were driven in.

This means that the lower part of the head of the screw transferred under the driver bit before driving is held by the screw holding belt, and if the screw is long, the tip of the screw is attached to the screw holding belt. This is because the screw is often deviated from the driving direction, and if the screw length is long, it is difficult to continue driving the screw while keeping it straight in the driving direction after it engages with the driver bit and separates from the screw holding belt. .

The present invention was proposed to solve these problems, and an object of the present invention is to provide a screw driving device that can drive even long screws into a workpiece while keeping them straight in the driving direction. shall be.

[Means to solve the problem]

In order to achieve this object, the screw driving device according to the present invention has a screw holding member for holding the screw transferred between the legs from the left and right sides and holding the screw in the driving direction, in the screw passage of the sliding member. The screw retaining members are attached to the left and right legs with a spring biased toward the screw holding side, and when the driver bit passes, these screw holding members are pushed open against the spring to ensure a passage for the driver bit. do. [
[Function] According to the above-mentioned configuration, the screw transferred under the driver bit is held in the screw driving direction by the screw holding members provided on the left and right legs, so that the screw cannot be driven straight into the member to be driven. [Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, 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, and has a square tubular sliding guide connected to the connecting member 2. Case 3 and return spring 4 inside this case 3
It consists of a sliding member 5 that is slidably inserted through the .

Sliding guide grooves 6 are formed in the vertical direction on both right and left sides of the front and back surfaces of the sliding member 5, and slide guide grooves 6 are formed in the vertical direction.
Convex portions 7 that protrude vertically on both sides of the front and rear surfaces of the case 3 fit into these sliding guide grooves 6, respectively, so that vertical sliding of the sliding member 5 in the case 3 is controlled by these sliding guide grooves 6. It is guided by a guide groove 6 and can be carried out smoothly. Furthermore, on the left side surface of the sliding member 5, a groove 8 for regulating the C sliding range is formed in the vertical direction except for the upper part, as shown in FIG. A pin 9 on the side surface inside the case 3 is fitted into this structure 8 as shown in FIG. Due to the stiffness, the sliding member 5 is pushed back by the return spring 4 to a position where the pin 9 comes into contact with the upper end 8a of the groove 8, and is pulled out from the case 3.

This kind of sliding mechanism can increase the strength of the case 3 compared to the conventional structure in which elongated holes are formed for sliding guides on both sides of the case. There is an advantage that the case 3 and the sliding member 5 can be easily separated by simply removing them by sliding them and pulling them out. Next, a screw transfer mechanism of the belt loading section for transferring the screw holding belt by one screw section by pushing the sliding member 5 into the case 3 will be explained.

A subrocket 15 is disposed at the center of the sliding member 5, as shown in FIG. 5, for feeding a screw holding belt 14 having screws 13 installed therein at equal intervals. The two subrockets l5 with iL5A formed on the outer periphery are the 6th
As shown in the figure, a ratchet wheel l8 is fixed to a central shaft 16 and rotatably attached to the end of the central shaft l6 protruding from one sprocket l5 via a coil spring l7. A claw 18A that engages with an engaging recess 15B formed on the outer surface of one of the subrockets l5 is provided on the inner surface of the ratchet wheel l8, and when the ratchet wheel 18 rotates in the direction of arrow A in FIG. subrocket 15
It is designed to mesh with the Ratchet wheel l8 and sprocket 1 urged in the detachment direction by coil spring 17
5, the halves 5a. 5b are housed in a sliding member 5 which is tightened together with screws 19. An arcuate long hole 20 is bored in the side surface of one half 5a, and a pin 21 is attached to the outer edge of the ratchet wheel 18 so as to protrude from the long hole 2o.

The side plate of the case 3 has an inclined portion 22A on which the pin 2l comes into contact when the sliding member 5 is pushed into the case 3 and rotates the ratchet wheel 18 in the direction of arrow A within the range of the elongated hole 2o. The slit 22 is in the longitudinal direction of the case 3 (
It is formed along the vertical direction). On the side slope of the case 3, a rotating lever 23 is rotatably attached to the side of the slit 22 by a pivot pin 24 screwed onto the side plate, and this lever 23 is moved in the direction of the slit 22 by a spring 25 ( A rotation biasing force is constantly applied in the counterclockwise direction.
A U-shaped cover 26 covering the lever 23 is attached to the side plate of the case 3 above the lever 23.

From the standby state, the tip of the sliding member 5 is brought into contact with the driven member 29, which is the other member into which the screw is driven, and the sliding member 5 is operated so as to be pushed into the case 3 against the return spring 4. Then, the bottle 2 is guided by the tapered part 28.
l slips under the lever 23. As the bin 21 is pushed downward by the lever 23, the ratchet wheel 18 engages with the sprocket l5, and while the bin 2l passes through the inclined portion 22A, the sprocket l5 moves the screw holding belt 14 by one screw distance. Rotates in eight directions. After passing through the inclined portion 22A, the pin 2l comes out from below the lever 23, and the ratchet wheel 18 separates from the sprocket 15. In this state, the sliding member 5
When pushed in further, the tip of the driver bit 30 that passes through the insertion hole 3l of the sliding member 5 engages with the head of the screw 13.
The screw l3 can be driven into the driven member 29 by the driver bit 30 which is rotationally driven by the electric driver tool 1. In the return operation, when the sliding member 5 retreats within the case 3 due to the biasing force of the return spring 4, the pin 21 moves downward along the slit 22 and returns to the standby state through the inclined portion 22A. During this return while passing through the slope part 22A,
Since the bin 21 rotates in the opposite direction through the elongated hole 20 while the ratchet wheel 18 is detached from the subrocket l5, only the ratchet wheel l8 simply rotates in the direction of arrow B.

Next, a screw holding mechanism for holding the screw l3 transferred under the driver bit 30 straight in the driving direction will be explained.

The legs protruding from the tip of the sliding member 5 are attached to the driven member 2.
It is not provided on the right side when facing the front so that the center of driving the screw l3 into 9 can be seen visually, and the three legs 32A, 32
It has a structure in which B and 32C are protruded. A reinforcing plate 33 is attached to the bottom surface of the tips of the left and right legs 32B, 32C at the rear by extending over these legs 32B, 32C with screws.

Left front and rear legs 32A. The recess 34 formed between the bases of the legs 32B is fixed to a support shaft 35 that spans in the front-rear direction on the left side between the legs 32A and 32B, and the left side that rotates around the support shaft 35 is fixed to the recess 34 formed between the bases of the legs 32A and 32B. A screw holding member 36 is provided. This screw holding member 36 is constantly biased upward (toward the tip of the driver bit) by a spring 37 fitted into the support shaft 35 exposed in the notch, and normally comes into contact with the surface of the recess 34. are in contact with each other.

As shown in FIG. 7, a protrusion 39 protruding into the passage 38 and blocking the passage 38 is formed on the front end of the screw holding member 36 on the screw passage side.
The screw l3 is held from the front side. Also aisle 3
The screw l3 is held from the left side by the stepped portion 40 on the rear side facing the screw l3.

A recess 4l that partially overlaps the groove 6 is formed in the front surface of the front leg 32A at a position corresponding to the rotation range of the screw holding member 36, and the tip of the support shaft 35 projects into the recess 41. The base of the operating lever 42 is fixed to the. In addition, between the base of the leg 32C on the right rear side and the protruding part 43 on the front side opposite to this base, a screw holding member 44 on the right side facing the holding member 36 rotates around a support shaft 45. It can be installed freely. Similar to the holding member 36, this screw holding member 44 is always given an upward rotation biasing force by a spring 46 fitted into a support shaft 45, and is normally in contact with the surface of the recess 47.

A tip 48 of the screw holding member 44 faces the screw passage 38, and the screw 13 is held from the right side by this tip 48.

Note that the screw holding member 36. A groove 49 through which the driver bit 30 passes is formed above the screw passage 44 and facing the screw passage 38. The groove 49 has a larger diameter than the width of the passage 38. In this screw holding mechanism, the driver bit 3
The screw l3, which has been transferred downward and whose middle part is held by the left and right screw holding members 36.44, is transferred to these screw holding members 36.44. 44, it is held straight in the screw driving direction (direction in which the driver bit moves straight). In this state, during the pushing stroke of the sliding member 5, the tip of the rotating driver bit 30 engages with the engagement groove of the head of the screw 13, and the screw l3, which is separated from the screw holding belt l4, is moved to the holding member 36. ．． 44, it is driven into the member to be driven 29 while being held in the driving direction.

The tip of the driver bit 30 is attached to the left and right screw holding members 36.
．． 44, these holding members 36. 44
is pushed downward (
As the driver bit 30 moves straight, the screw l3 is completely driven into the driven portion 29. In this way, the screw holding member 36 is attached to the sliding member 5. 44, even when driving long screws, the screw l3
Since the screw 13 can be driven while being held straight in the driving direction, the screw 13 can be driven accurately at the driving center C of the member 29 to be driven.

The operating lever 42 is for operating the screw holding member 36 into an open state, and the operating lever 42 is operated by a spring 37.
The screw holding member 36 on the left side can be opened by rotating it clockwise against this. At this time, the small protrusion 50 protruding from the rear leg 32B surface engages with the rear recess 51 of the holding member 36, as shown in FIG. 9, and the screw holding member 36 is held in the open state. Note that the upper part of this small protrusion 50 has an arcuate cross section, and is pushed upward by a spring 52 from below.

When the screw holding member 36 is open, passage of the screw 13 in the screw passage 38 is not obstructed, so the screw holding belt 14 can be freely pulled out by hand in the screw transport direction in the standby state. In addition, by rotating the operating lever 53 for pulling out the belt downward, one end of the lever 53 comes off from the feed dog 15A of the subrocket 15, and the screw holding belt 14 is moved not only in the screw transport direction but also in the reverse direction (backward direction). You can also pull back freely.

By the way, with the screw holding member 36 open, the 10th
When the sliding member 5 is pushed into the case 3 as shown in Figure C,
The convex groove 7 of the case 3 comes into contact with the R-shaped step 54 at the base of the lever 42, the lever 42 is rotated counterclockwise, and the screw holding member 36 is closed naturally. In this manner, the screw holding member 36 in the open state can be returned to the normal closed state shown in FIG. 7 by the pushing movement of the sliding member 5.

Next, another embodiment will be described based on FIG. 11.

In this embodiment, the screw holding mechanism section 58 is designed so that the screw holding mechanism described above can be easily replaced when the screw holding mechanism breaks down.
Including the front leg part 32A, the protruding part 43, and the rear leg part 32B.
．． This is a block of part of 32C. This block 55 can be attached and detached by engaging and disengaging the plurality of upper and lower engaging portions 56 with the engaging portions 57 on the main body of the device, so that the block 55 can be easily replaced in the event of a failure. It is now possible to do this. Next, still another embodiment will be explained based on FIG. First, the general configuration of the screw driving device of this embodiment will be explained. The left and right side plates of the sliding guide case 59 attached to the ends of the connecting member 2 are provided with long holes 60 for sliding guides, as shown by cutting out the side cover 59A. A sliding member 62 having a pin 61 protruding left and right using a sliding guide that fits into the case 59 can slide within the case 59 within the elongated hole 80 against a return spring (not shown).

A belt loading portion within the sliding member 62 is provided with a subrocket 63 that engages with the feed groove C of the screw holding belt l4 in which the screw 13 is installed, and a ratchet wheel 84 that engages with the subrocket 63. The screw holding belt l4 is supplied to the belt loading section from the belt inlet on the back side of the sliding member 62, and the empty belt with the screws 13 hammered out is ejected to the outside from the belt outlet on the front side.

The pin 65 protruding from the upper surface of the ratchet wheel 64 has
One end of a rotating lever 66 for belt transfer is attached, and a pin 87 on the free end side of the rotating lever 66 is connected to a rotating guide groove 6 formed on the back surface of the case 59 so as to communicate with a long hole 60.
B is fitted. The code 89 is - on the sliding member 62 side.
It is a well-shaped rotation guide hole.

The rotating lever 66 rotates the ratchet wheel 64 clockwise when the sliding member 62 is pushed into the case 59 and the bin 67 passes through the inclined rotation guide groove 68. The screw retaining belt l4 is transported by the -thread section by the meshing subrocket 63,
The screw l3 is attached to the front and rear legs 32A, 3 at the tip of the sliding member 62.
Sent between 2B. When the sliding member 62 is pushed back inside the case 59 by the return spring and returns to the standby state, when the pin 67 passes through the rotation guide groove 68, the ratchet wheel B4 rotates counterclockwise. As a result, the mesh with the subrocket 63 becomes disengaged, and the subrocket 63 does not rotate. After the hook lever 70 transfers the screw l3 under the driver bit, it moves the sliding restriction bottle 61 to the hook 70A.
This is to temporarily hold the sliding member 62 while it is being pushed into the case, and to easily center the screw marked on the member to be driven with the driving center. It is now possible to do this. The leg portions 32A, 32B, 32C and the protruding portion 43 of the sliding material 62 are provided with screw holding members 36, 44, and an operating lever 42. The screw holding mechanism 58 described above, which is composed of small protrusions 50 and the like, is provided. In addition, the leg portion 32C,
The screw holding member 44 is omitted from illustration.

〔Effect of the invention〕

As explained above, according to the present invention, the screw transferred under the driver bit can be held straight in the driving direction by the screw holding member, so even when driving a long screw of about 5 cm, the driving center of the driven member can drive screws accurately.

In addition, conventionally, screws could be screwed in if they were deviated from the driving direction, but with the present invention, such problems do not occur at all, and the reduction in work caused by re-driving screws is eliminated, resulting in a significant reduction in the number of screws being driven. Work efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a screw driving device according to an embodiment of the present invention attached to an electric screwdriver tool, FIG. 2 is a perspective view of the screw driving device, and FIG. 3 shows a sliding member of the screw driving device. The left side view shown in Fig. 4 is I- of Fig. 3.
1-line cross-sectional view, Figure N5 is a vertical cross-sectional view of the screw driving device as seen from the right side, FIG. 6 is a longitudinal cross-sectional view of the main part of the screw driving device seen from the back side, and FIG. 7 is a vertical cross-sectional view of the screw driving device as seen from the back side. FIG. 8 is an explanatory diagram for explaining the operation of the screw holding mechanism of the screw driving device, and FIG. 9 shows one screw holding member in an open state. FIG. 10 is an operation explanatory diagram for explaining the operation of the screw holding mechanism, and FIG. 11 is an exploded perspective view showing a screw driving device of another embodiment.
FIG. 2 is a cutaway plan view of a screw driving device according to another embodiment, and FIG. 13 is a perspective view of a conventional screw driving device. 1... Electric screwdriver tool 2... Connecting member 3.5
9-...Sliding guide case 4...Return spring 5.62-
...Sliding member 5a, 5b...Half body 6...Sliding guide groove 7...Convex portion 8...Groove
9... Bin 10... Screw
13...Screw l4...Screw holding belt 15
．． 63- Sporrocket 15A... Teeth
l7... Coil spring 18.84... Ratchet wheel 20... Long hole 2l... Pin 22A... Inclined portion 29... Member to be driven 31... Insertion hole 33... Reinforcement plate 35. 45... Support shaft 37. 46...Spring 39...Protrusion 4l...Recess 43...Protrusion 49...Groove 51...Recess 53...Operation lever 55...Block 58...Screw holding Mechanism 61... Bin 6B Rotating lever 68 Rotating guide groove 70 Hook lever 22 Slit 23 Rotating lever 30 Driver bits 32A, 32B, 32C ... Leg portion 34. 47... recess 36. 44...Screw holding member 38...Screw passage 40...Step part 42...Operation lever 46...Tip part 50...Small protrusion 52...Spring 54...Step part 56. 57... Engaging portion 60... Long hole 65... Bin 67... Bin 6g... Circulation guide hole 70A... Hook Figure 3 Figure 4 Figure 6 Figure 8 Figure 10 figure

Claims (1)

[Claims] A sliding guide case is attached to the tip of the driver tool to which the driver bit is installed via the connecting member, and the sliding member is inserted into the sliding guide case so as to be slidable in the vertical direction via the return spring, and a screw is inserted. The set screw holding belt is loaded into the belt loading portion of the sliding member, and when the sliding member is pushed into the sliding guide case, the screw holding belt is transferred by one thread, and the tip of the sliding member is moved. In a screw driving device configured to be able to drive a screw transferred between the leg parts of the screw into a driven member using the driver bit, the screw transferred between the leg parts is held between the left and right sides to hold the screw in the driving direction. The screw holding members are attached to the left and right legs facing the screw passage of the sliding member and biased by a spring toward the screw holding side, and these screw holding members are pushed against the spring when the driver bit passes. A screw driving device characterized in that it is opened to ensure a passage for a driver bit.