JPH077068Y2 - Catcher unit of automatic screw tightener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a catcher unit of an automatic screw tightener.

<Prior Art> A catcher unit of a conventional automatic screw tightener will be described with reference to FIGS. 5 and 6.

As shown in Fig. 5, the automatic screw tightener uses a screw feeder 20
The screw 500 supplied by being compressed by compressed air from 0 is held by the catcher unit 100, and the screw 500
Is sucked onto the driver bit 120 and screwed onto the work W. In the drawing, 300 is a motor for rotating the driver bit 120, and 400 is the driver bit 12
An air cylinder that moves 0 up and down.

The catcher unit 100 includes a main body 10, a pair of holding claws 20a and 20b (however, 20b is not shown in the drawing) attached to the main body 10 so as to be openable and closable, and a screw supply device 2
It has a screw supply pipe 30 that guides the screw 500 supplied from 00 to the tips of the holding claws 20a and 20b, and the pipe (screw supply pipe 30) as a whole has a substantially washing scissor shape protruding obliquely upward. There is.

A guide hole 11 passes through the main body 10, and the suction pipe 110 including the driver bit 120 can be inserted into and removed from the guide hole 11.

The pair of holding claws 20a, 20b attached to the main body 10 by a pin (not shown) so as to be openable and closable are always elastically urged in the direction of closing their ends by an elastic body (not shown). At the tips of the pair of holding claws 20a and 20b, the leg portion 510 of the supplied screw 500 is provided.
The holding hole 22 is formed so that only the protrusions are formed.

The screw supply pipe 30 has a pair of holding claws as shown in FIG.
It is swingably attached to the main body 10 so as to enter the inside of 20a, 20b. Moreover, this screw supply pipe 30
It is elastically urged by an elastic body (not shown) so that its end is located above the holding hole 22.

Next, the operation of the catcher unit 100 configured as described above will be described.

In the known screw supply device 200, the screw 500 is pressure-fed to the screw supply pipe 30 by the screw supply hose 210 with the leg portion 510 facing forward. Then, the screw 500 is held in the holding holes 22 provided at the tips of the holding claws 20a and 20b (see FIG. 6 (a)).

The suction pipe 110 descends together with the driver bit 120, pushes the screw supply pipe 30 out of the holding claws 20a, 20b, and screws 50
Adsorb 0. Then, the screw 500 fits into the tip of the driver bit 120 (see FIG. 6B).

Then, the driver bit 120 with the screw 500 attached to the tip
Lower the holding claws 20a and 20b while spreading them, and
Is screwed onto the work W.

<Problems to be Solved by the Invention> However, the catcher unit of the conventional automatic screw fastening machine described above has the following problems.

That is, since the screw fed by compressed air has a sharp leg in front, it is easy to get caught in the screw supply pipe and there is a problem in working efficiency.

This is a problem peculiar to the catcher unit of the automatic screw tightener of the type in which the screw is fed by compressed air.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a catcher unit of an automatic screw tightening machine in which a supplied screw does not get caught in a screw supply pipe or the like.

<Means for Solving the Problems> The catcher unit of the automatic screw tightener according to the present invention is
Provided at the tip of an automatic screw tightening machine having a driver bit for screwing a screw pressure-fed from the screw supply device in front of a work to a work, and a suction pipe that contains the driver bit and sucks the screw. In the catcher unit of the automatic screw tightener that holds the screw,
A pair of holding claws that are openably and closably supported, and an elastic body that elastically urges the holding claws in the closing direction, and the holding claws include a screw passage groove that forms a screw passage when closed, At the end of the screw passage groove, a holding hole notch that forms a holding hole that holds the screw that has passed through the screw passage, and a notch that forms a notch groove that passes through the screw passage and the outside are formed. The screw that has been pressure-fed through the screw passage is
The legs are dropped into the cutout grooves and held in the holding holes with the head on top.

<Operation> A screw with the head in front is fed from the screw supply device to the screw passage.

The screw that has entered the screw passage is pumped with the head down, that is, with the head in front. Then, when the screw reaches the position of the cutout groove, the leg is cut into the cutout groove as the air pumping the screw flows out from the cutout groove. That is, the screw changes to a posture with its head up.

The screw is held in the holding hole with the head up.

In this state, the suction pipe is inserted into the suction pipe opening, and the screw is sucked to the tip of the driver bit contained in the suction pipe. The suction pipe pushes the holding claws apart while fixing the pair of holding claws against the elastic force of the elastic body, and screws the work W with screws.

When the screwing is finished, the suction pipe rises, and the holding claw is closed. Then, the next screw is supplied from the screw supply device.

<Embodiment> An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of a catcher unit of an automatic screw tightening machine according to an embodiment of the present invention, and FIG. 2 is an AA of FIG.
FIG. 3 is a sectional view of the catcher unit of the automatic screw tightening machine according to the second embodiment, and FIG. 4 is an external perspective view of the catcher unit of the automatic screw tightening machine according to the third embodiment. .

Catcher unit 10 of the automatic screw tightener according to the present embodiment
0 is a pair of holding claws 20a, 20b supported so as to be openable and closable,
The elastic body 29 elastically biases the holding claws 20a and 20b in the closing direction.

The screw supply pipe 30 that supports the pair of holding claws 20a and 20b in an openable and closable manner includes a mounting portion 33 having a substantially square shape, a base portion 31 erected at the center of the mounting portion 33, and the mounting portion 33. And a supporting portion 32 hanging from the corner. The attachment portion 33 is a portion for attaching the catcher unit 100 to an automatic screw tightener (not shown). The base part 31 is a part to which the screw supply pipe 210 of the screw supply device 200 is connected, and opens at the center of the back surface of the mounting part 33.

As shown in FIG. 2, the holding claw 20a holds the screw passage groove 21a that forms the screw passage 21 when closed and the screw 500 that is the terminal end of the screw passage groove 21a and that has passed the screw passage 21. Notch 22a for holding hole forming holding hole 22 and screw passage 21
And a cutout 23a that forms a cutout groove 23 that extends between the outside and the outside. Since the holding claw 20b is symmetrical with the holding claw 20a, detailed description thereof will be omitted.

The screw passage groove 21a is a semicircular groove formed from the base end portion to the tip end portion of the holding claw 20a. This screw passage groove 21a
Is set to have a diameter slightly larger than the head 520 of the screw 500 so that the screw 500 can pass when the screw passage 21 is formed.

Further, a semicircular holding hole notch 22a is formed in the vertical direction at the terminal end of the screw passage groove 21a. Notch for this holding hole 2
The diameter of 2a is set so that only the leg portion 510 of the screw 500 fits when the holding hole 22 is formed. Above the holding hole notch 22a, a semi-circular suction pipe notch 24a that forms the suction pipe opening 24 into which the suction pipe 110 can be inserted is formed.

Further, a cutout 23a is formed from the center of the surface corresponding to the bottom surface of the screw passage groove 21a to the holding hole cutout 22a. Notch groove 23 formed by this notch 23a
Connects the screw passage 21 to the outside, and
The dimensions are set so that only the legs 510 of the 500 fit.

In the drawings, 28a indicates a protrusion for hooking the elastic body 29.

The holding claws 20a and 20b are provided on the support portion 32 of the screw supply pipe 30.
It is supported by pins 27a and 2b to be openable and closable.

Next, the operation of the catcher unit 100 described above will be described.

From the screw supply device 200, the screw 500 is pressure-fed with the head 520 in front. The screw 500 is pressure-fed to the screw passage 21 from the screw supply pipe 30 via the screw supply hose 210.

The screw 500 that has entered the screw passage 21 drops with the head 520 facing downward, that is, with the head 520 facing forward. When the screw 500 reaches the position of the cutout groove 23, the air (indicated by an arrow A in FIG. 2) pumping the screw 500 is pressed.
The legs 510 fall into the notches 23 as they flow out. That is, the screw 500 changes to a posture with the head 520 facing up.

The screw 500 is held in the holding hole 22 with the head 520 facing upward.

In this state, the suction pipe 110 is inserted into the suction pipe opening 24, and the screw 500 is sucked by the tip of the driver bit 120 included in the suction pipe 110. The suction pipe 110 is an elastic body
While holding the elastic force of 29, attach the holding claws 20a, 20b to the pins 27a, 27b.
And spread it out, and screw the screw 500 onto the work W.

When screwing of the screw 500 is completed, the suction pipe 110 moves up, and the holding claws 20a and 20b are closed by the elastic body 29. Then, the next screw 500 is pressure-fed from the screw supply device 200 to the holding claws 20a and 20b.

The shapes of the holding claws 20a and 20b are not limited to those shown in FIGS. 1 and 2 and may be those shown in FIG.

The catcher unit 100 shown in FIG.
A main body 10 having a guide hole 11 that can be inserted and removed and a screw supply pipe 30 that intersects the guide hole 11 obliquely from above, and a pair of holding claws 20a that is attached to the main body 10 so as to be openable and closable. 20b (However, the holding claw is shown in Fig. 3)
Only 20a is shown).

The cutout claw 23 similar to that described above is provided over the screw supply pipe 30 and the holding claws 20a and 20b.
Therefore, the catcher unit 100 shown in FIG. 3 can also hold the screw 500 supplied in front of the head 520 in the holding hole 22 with the head 520 facing up, as in the above-described case. it can.

Furthermore, the holding claws 20a and 20b can also be shaped as shown in FIG. In this case, the suction pipe 110 does not push open the holding claws 20a and 20b, but the holding claws 20a and 20b are pushed open by the cam 311 that descends at the same time (see FIG. 4 (b)).

<Effect of the device> The catcher unit of the automatic screw tightener according to the present invention is
The holding claw includes a pair of holding claws that are openably and closably supported, and an elastic body that elastically biases the holding claws in the closing direction, and the holding claw has a screw passage groove that forms a screw passage when closed. A terminal hole of the screw passage groove, a holding hole notch forming a holding hole for holding a screw passing through the screw passage, and a notch forming a notch groove passing through the screw passage and the outside. The screw pressure-fed to the screw passage is held in the holding hole in a state where the leg portion is dropped into the notch groove as the compressed air flows out from the notch groove and the head is up.

Therefore, since the screw head can be supplied in front, the screw is not caught on the screw supply pipe or the like.
Therefore, work efficiency can be improved as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is an external perspective view of a catcher unit of an automatic screw tightening machine according to an embodiment of the present invention, and FIG. 2 is an AA of FIG.
3 is a sectional view of the catcher unit of the automatic screw tightening machine according to the second embodiment, and FIG. 4 is an external perspective view of the catcher unit of the automatic screw tightening machine according to the third embodiment. FIG. 5 is a schematic configuration diagram of a conventional automatic screw fastening machine, and FIG. 6 is a sectional view of a catcher unit. 100 …… Catcher unit, 20a, 20b …… Holding claw, 21
...... Screw passage, 21a, 21b ...... Screw passage groove, 22 ...... Retaining hole, 22a, 22b ...... Retaining hole notch, 23 ...... Notch groove, 23a, 2
3b …… Notch, 29 …… Elastic body, 110 …… Suction pipe, 120…
… Driver bits, 500… Screws, 510… Legs, 520…
…head.

Claims (1)

[Scope of utility model registration request] 1. An automatic screw tightening machine having a driver bit for screwing a screw, which is pressure-fed from a screw supply device in front of a screw, to a work, and an adsorption pipe for enclosing the driver bit and adsorbing the screw. Is provided at the tip of
A catcher unit of an automatic screw tightener that holds the screw includes a pair of holding claws that are openably and closably supported, and an elastic body that elastically biases the holding claws in a closing direction. Includes a screw passage groove that forms a screw passage when closed, a holding hole notch that forms a holding hole that holds a screw that has passed through the screw passage, and a screw passage that is a terminal end of the screw passage. And a cutout that forms a cutout groove passing through the outside, and a screw that has been pressure-fed and passed through the screw passage is inserted into the holding groove with the leg portion dropped into the cutout groove. A catcher unit for an automatic screw tightener, which is held by the.