JPS5882683A - Screw arranging device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention agitates the screws in a screw stirring container by directly blowing air onto a large number of screws that have been thrown in separately, and after this stirring process, the screws are aligned. This invention relates to a screw alignment device that allows screws to be taken out.

Generally, in order to perform the next operation on parts that have been input in a random state, these parts must be aligned in a certain direction. The device that aligns the parts is called a parts feeder. Many of these parts feeders are of the type that aligns the parts 1 using a vibration or rotation mechanism. However, these mechanisms make the parts feeder large and
In addition, it was a stationary type, which had the disadvantage of a complicated structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a screw alignment device that is simple in structure and exhibits excellent alignment even if the overall arrangement angle of the device changes. To achieve this object, the present invention is provided in a cylindrical screw-stirring container covered with an upper lid so as to be inclined with respect to the upper lid, and that cooperates with the upper lid to partially rotate the screw-screw stirring container. It has a screw alignment guide plate that divides the screw alignment guide plate into a closed space, and a first air blowing hole for blowing air into the closed space is formed at the lower end side of the screw alignment guide plate on the peripheral wall of the screw stirring container, and at the upper end of the screw alignment guide plate. A notch is formed on the side from which the threaded portion of the screw protrudes, and a second groove is provided between the upper end and the lower end of the screw alignment guide plate for blowing air into the closed space in the tangential direction of the circular cross section of the screw stirring container. While forming the nib blowout hole, a screw alignment plane parallel to the top cover is formed at the upper end of the screw alignment guide plate, and the distance between this screw alignment plane and the top cover is set to be slightly larger than the diameter of the screw head. A large number of screws are stored in the closed space, and these screws are agitated by air blown from the first and second air blowing holes, and there is a space between the top cover and the plane for aligning the screws. The device is characterized in that the screws are captured one by one with the screw portion protruding from the notch.

Hereinafter, an embodiment in which the screw alignment device of the present invention is incorporated into a pneumatic screwdriver 1 will be described in detail with reference to FIGS. 1 to 5. FIG. 1 shows a vertical cross section of a pneumatic screwdriver 1, and this pneumatic screwdriver 1 has a pistol-shaped body 2, an air motor 6, a reduction gear device 4, a clutch 5 (however, in FIG. (The specific structure of the clutch 5 is omitted), air motor trigger pulp 6
and a trigger pulp 7 for screw blowing, and further includes a bit shaft 8 partially protruding from the body 2, a nose 9 that can freely slide in the longitudinal direction with respect to the bit shaft 8, and a screw alignment device 10. ing. A compressed air storage chamber 11 is formed within the grip 12 of the body 2.

The rotation shaft 16 of the reduction gear 15 of the reduction gear device 4 is formed into a cylindrical shape in the pinion 14 integrated with the drive shaft 16 of the air motor B. The inner surface of this rotating shaft 160 has a hollow hexagonal cross section, and the input shaft 17 of the clutch 5 is inserted into the rotating shaft 16 .

An interlocking plate 18 at the end of the input shaft 17 and an interlocking plate 20 at the end of the output shaft 19 interlock with each other so as to cut off torque transmission at a torque greater than a portion.

The clutch 5 is of a normal type, and when the bit shaft 8 becomes overtorqued, the rotation shaft 16 of the reduction gear 15 is
Torque transmission from to the bit shaft 8 is cut off.

The output shaft 19 and the bit shaft 8 are integrally connected.

A bit 26 is formed at the tip of the bit shaft 8 and fits into a groove in the head 22 of the screw 21.

The air motor 6, which rotationally drives the bit shaft 8, is started and stopped by manual operation of the air motor trigger valve 6, which is a two-way switching spool valve type.

The exhaust port 24 of the air motor B is connected to the screw alignment device 1.
0 air supply boat 25 and two return air supply boats 61'a and 62a of the two stop piston cylinders 61 and 62.

The trigger pulp 7 for screw blowing is a two-way type spool valve, and its manually operated end 26 protrudes behind the grip 12. In addition, the manual operation end 26 is stopped by a stopper 27 protruding from the rear of the grip 12 while being subjected to the force of a compression coil spring 28.

The negative port 29 of the trigger pulp 7 for screw blowing communicates with the compressed air storage chamber 11, and the other port 60 of the trigger pulp 7 for screw blowing communicates with the feeding air receiver of the screw feeding port 51 shown in FIG. It is connected to port 58. The screw feed port 51 passes through the flexible Q-Pro 2,
A screw receiver protruding from the side of the nose 9 is connected to the port 61. In the screw receiver, the port 31 is formed to protrude obliquely with respect to the nose 9.

The nose 9 is fitted onto the outside of the bit shaft 8 and is slidably movable with respect to the bit shaft 8. Furthermore, the nose 9 is fitted inside a cylindrical nose cover 66 extending from the body 2 to the tip thereof. It is inserted. Slits (not shown) are formed on the upper and lower sides of the nose cover 66, respectively, and the screw receivers are connected to the boat 61 through these slits. The slide piece 34 fixed to the lower side of the nose 9 is allowed to move. The slide piece 64 is externally fitted onto a sliding guide rod 65 which is fitted into the hole 2a of the body 2. One end of the compression coil spring 66 fitted onto the sliding guide rod 35 is connected to the slide piece 3.
4, and the other end of the compression coil spring 66 is in contact with the body 2.

The nose 9 is accurately guided by the bit shaft 8 and the sliding guide rod 65, and is slid in the longitudinal direction of the bit shaft 8. As shown in FIG. 1, the threaded receiver of the nose 9 allows the nose 9 to stand still when the boat 61 is located ahead of the bit 26. This is due to the engagement between the lunge 37 and the body 2 and the restoring force of the compression coil spring 36.

66. This nose side screw holding device 66
As a result, the screw 21-1 is held within the nose 9 in a state in which it is ready for screwing. During the screwing/operation of the screw 21, the nose 9 is pressed against the material to be screwed and retreats, so that the bit 23 fits into the groove of the head 22 of the screw 21.

Details of the screw alignment device 10 are shown in FIGS. 1 and 2. As seen in these figures, a cylindrical alignment device casing 42 is attached to a support plate 41 extending from the lower end surface 12a of the grip 12 to the front of the body 2 along the bit axis 8. This alignment device casing 42
A cylindrical screw stirring container 46 with a garden is also installed inside. The alignment device casing 42 is provided with an air supply boat 25 .

The screw stirring container 46 is arranged concentrically with respect to the alignment device casing 42, and the peripheral wall 4 of the screw stirring container 46 is arranged concentrically with respect to the alignment device casing 42.
A clearance 44 through which compressed air flows is secured between the screw stirring container 3a and the peripheral wall 42a of the screw stirring container 42. Still, the outer bottom surface 43b of the screw stirring container 43 is provided with a leg portion 45 formed in an annular shape, and the compressed air within the clearance 44 is connected to the outer bottom surface 43b of the screw stirring container 46 and the inner bottom surface 42b of the alignment device casing 42. This prevents it from getting stuck in between.

The aligner casing 42 is hermetically sealed by a removable shallow cylindrical top cover 48.

This upper cover 48 is removed, and a large number of screws 21 are randomly stored in the screw stirring container 46.

An inclined oval screw alignment guide plate 46 is disposed inside the screw stirring container 46 . A closed space A is formed in a part of the screw stirring container 46 by the screw alignment guide plate 46, the peripheral wall 43a of the screw stirring container 46, and the upper lid 48.

As shown in FIGS. 1 and 2, the screw alignment guide plate 46 is arranged horizontally with respect to the bit shaft 8, and the highest part thereof is connected to the ceiling surface 48a of the upper cover 48.
A screw alignment plane 47 is provided which is parallel to the screw alignment plane 47 .

A large number of screws 21 are placed on the lower part of the screw alignment guide plate 46 in a random manner. Ceiling surface 48a of upper lid 48
The distance between the head 2 of the screw 21 and the screw alignment plane 47 is
The diameter is slightly larger than 2. With this configuration, the screws 21 are blown upward by the screw alignment guide plate 46, and when the screw alignment guide plate 46 is climbed, there is a gap between the screw alignment plane 47 and the ceiling surface 48a of the upper cover 48. The head 22 of the screw 21 is restrained. Each screw 2 is attached to the peripheral wall 42a of the alignment device casing 42 and the peripheral wall 43a of the screw stirring container 43 located between the ceiling surface 4-8a of the upper lid 48 and the screw alignment plane 47.
A rectangular notch 49 is formed with a width slightly wider than that through which the head 22 of 1 can pass (see FIG. 2).

One longitudinal end 50a and one widthwise end 50b of a pair of screw feeding guide plates 50 constituted by a pair of upper and lower plates are inserted into the notch 49 (see FIG. 3).

The other longitudinal end side 50C of a pair of screw feed guide plates 50
is inserted horizontally into the screw feed boat 51.

As shown in FIG. 2, on the peripheral wall 43a of the screw stirring container 46, an upper portion adjacent to the lower end 46a of the screw alignment guide plate 46 is provided with a screw alignment guide plate that is oriented transversely to the axis of the screw stirring container 43, A first air blowing hole 52 is formed in a direction that matches the projection of the central axis of the guide plate 46 onto the inner bottom surface 43C of the screw stirring container 46. The air blown into the closed space A from the first air blowing hole 52 rises along the direction of inclination of the screw alignment guide plate 46.

Further, as shown in FIGS. 1, 2, and 5, a screw alignment guide plate 46 is provided on the peripheral wall 43a of the screw stirring container 46.
A plurality of (three in this embodiment) second air blowing holes 56 are formed at a position above the second air blowing holes 56 . The direction of these second air blowing holes 56 is parallel to the tangential direction of the circular cross section of the screw stirring container 46 so that the compressed air rotates clockwise within the screw stirring container 46, as shown in FIG. is set to

The compressed air blown into the screw stirring container 46 from the first air blowing hole 52 and the second air blowing hole 56 forms an inverted conical air swirling flow.

Moreover, this air swirling flow exerts an upward thrust along the screw alignment guide plate 46. This upward thrust causes the screw 21
overflows onto the screw alignment guide plate 46 and is pushed up onto the screw alignment plane 47. The posture in which the screws 21 are pushed up onto the screw alignment plane 47 is not constant. Therefore, when the threaded portion 54 of any one of the screws 21 is inserted into the screw feed guide plate 50 through the notch 49, the screw 21 is captured. Experiments have shown that the screw 21 is always captured on the screw alignment plane 47 within a very short time.

As shown in FIGS. 1 and 3, a total of six screws 21 are held in parallel between a pair of screw feed guide plates 50. The screws 21 are aligned with the heads 22 of these screws 21 in contact with each other, and the screws 21 are pushed out from the pair of screw feed guide plates 50 into the screw feed board 51.
a is a state in which the lower surface of the head 22a is hooked to the three balls 55 shown in FIG.
held within. The upper surface of the head 22a of the screw 21a abuts against a shoulder 57 formed on the inner wall 56a of the screw feed passage 56 in the screw feed boat 51. A feed air receiver port 58 is formed in the screw feed port 51, and the feed air receiver port 58 is connected to the other port 60 of the screw blower trigger valve 7 as described above.

Details of the screw holding device 59 on the screw feeding port side that holds the screw 21a in the screw feeding boat 51 are shown in FIGS. 3 and 4. This screw holding device 59 on the screw feed port side has three balls 55 that partially protrude into the screw feed passage 56 at an interval of 120°, and these balls 55 are held within the cross-sectional radial direction of the screw feed passage 56. It is composed of three compression coil springs 60 that elastically bias the spring.

These compression coil springs 60 are springs with weak restoring force, and the ball 55 retreats from the screw feeding passage 56 due to the force of the compressed air blown into the port 58 pushing the screw 21a, and the compression of the screw 21a It becomes possible to feed by air.

The screw 21a released from the screw holding device 59 on the screw feed port side is sent to the screw holding device 66 on the nose side by the pressure of compressed air.

The stop piston cylinders 61 and 62 have the same configuration, and a stop stem 64 is provided to protrude from the piston 66 of the stop piston cylinder 61 below the upper lid 48 . This stopping stem 64 comes into contact with the rear side of the head 22b of the last screw 21b of the six screws 21 arranged in parallel on the pair of screw feed guides 50 in the most advanced state.

The stop stem 66, which is provided so as to protrude from the piston 65 of the stop piston/cylinder 62 toward the pair of screw feed guide plates 50, is parallel to the pair of screw feed guide plates 50 in its most advanced state. The head 22C of the screw 21C located at the forefront of the six screws 21 comes into contact with the front side of the side, and at the same time the screw 21 in the screw feeding boat 51
It comes into contact with the rear side of the head 22a of the head 22a. The six screws 21 in the pair of screw feeding guide plates 50 are held stationary by the stopping stems 64 and 66.

The operation of the pneumatic screwdriver 1 is performed in the following order. That is, in a state where the compressed air storage chamber 11 is connected to the compressor, when the manual operation end 26 of the trigger pulp 7 for screw blowing is pushed (moved to the left in FIG. 1), the trigger pulp 7 for screw blowing is pressed. Compressed air is supplied from the other port 3o of the trigger pulp 7 to the port 58 of the feed air receiver, and the pressure of the compressed air causes the screw holding device 59 on the screw feed port side to be in the released state, and the screw 21a is fixed to the nose side screw. It is sent to the holding device 66 and held by this nose side screw holding device 63.

Then, by manually operating the air motor trigger pulp 6,
When compressed air is supplied to the air motor 6, the air motor 6 starts rotating, thereby starting the pit shaft 8. By pressing the nose 9 against the material to be screwed, the nose 9 moves backward (moves to the right in FIG.
At the same time as it is fitted, it is rotated and the screw is fed to the material to be screwed. During this time, the exhaust air from the air motor 6 is blown into the screw stirring container 43 through the exhaust port 24 and the air supply port 25 of the screw alignment device 1o, and at the same time, the air supply ports 6 for retreating each of the stop piston cylinders 61 and 62 are blown into the screw stirring container 43.
1a and 62a. Therefore, at the same time that a large number of screws 21 are stirred in the screw stirring container 46, the stop stems 64 and 66 rise, thereby allowing the screws 21 to jump in and move within the pair of screw feed guide plates 50. ing. A new screw 21 is attached to the screw stirring container 4.
6 and the leading screw 2 in the screw feed guide plate 50 by jumping into the notch 49 of the alignment device casing 42.
1C is pushed toward the screw holding device 59 on the screw feeding port side.

When the threading process of the screw 21 is completed, the air motor trigger pulp 6 is released, and as a result, the air motor 6 stops rotating, and at the same time, exhaustion of the air motor 3 is completed.
The stopping stems 64 and 66 descend to hold the screws 21 in an aligned state within the pair of screw feeding guide plates 50, and at the same time, agitation of the screws 21 within the screw stirring container 43 is also stopped.

Thereafter, the next screw threading process is repeated by manually operating the screw blowing trigger pulp 7 again.

As described above, according to the present invention, since air is directly blown onto the screws placed in random conditions, no rotation or vibration mechanism is required.

Further, since the screws are driven into a narrow notch between the top cover and the screw alignment guide plate, the efficiency of the screw alignment action hardly changes even if the installation angle of the screw alignment device changes.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a pneumatic screwdriver equipped with the screw alignment device of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an explanation of the direction x in Fig. 2. It is a diagram. 10... Screw alignment device, 21... Screw, 22...
Head, 46...-screw stirring container, 46a... peripheral wall. 46... Screw alignment guide plate, 47... Screw alignment plane, 48... Upper lid, 49... Notch, 52... First air blowing hole, 56... Second air blowing hole Hole, 5
4...Threaded part, Am closed space. Patent Applicant Max Co., Ltd. Patent Attorney Akira Koike Figure 3 Prefecture Figure 4 Figure 6

Claims (1)

[Claims] Inside the cylindrical screw-stirring container covered by the top lid, there is a screw alignment guide plate that is installed at an angle with respect to the top lid and works together with the top lid to divide a part of the screw-stirring container into a closed space. A notch is formed at the lower end of the screw alignment guide plate on the peripheral wall of the screw stirring container, and a notch protruding into the closed space is formed between the upper and lower ends of the screw alignment guide plate. forming a second air blowing hole for blowing air that stirs the screws into the closed space in the tangential direction of the circular cross section, and forming a screw alignment piece plane parallel to the top cover at the upper end portion of the screw alignment guide plate; The distance between this screw alignment plane and the top cover is set to be slightly larger than the diameter of the enlarged head of the screw, and a large number of screws are stored in the closed space, and these screws are connected to the first and second screws. This screw alignment device is agitated by air blown from the air blowing hole of No. 2, and captures screws one by one with the screw portion protruding through a notch between the top cover and the plane for screw alignment.