JPH0727728U - Screw holder for automatic screw tightener - Google Patents

Abstract

(57) [Summary] [Purpose] Securely catch and hold the screw in a normal posture. [Structure] A claw member 3 which is always urged by an elastic force in a fixed direction by a torsion spring 12 and is in communication with the joint member 2, and a connecting member 4 which is pushed by a forward movement of a suction sleeve to press and rotate a tapered surface. Is equipped with. After the screw 6 is fed from the screw supply device, the claw member 3 together with the connecting member 4 is rotated to an angle at which the bit can enter. After that, the bit enters and advances through the suction sleeve 5, and the screw 6 held by the claw member 3 is tightened by the bit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a screw holder for an automatic screw tightener that receives and holds the pressure-fed screws in an appropriate posture so that the screws, which have been pressure-fed one by one from a screw feeder, can be tightened on a member to be tightened with a bit. It is about.

[0002]

[Prior art]

 Various electric screw tightening devices have been developed which can rotate a bit by driving a motor and tighten a screw attached to the tip of the bit to a member to be tightened. Further, it is known that this electric screw tightening device is provided with an automatic screw feeding mechanism capable of automatically feeding the screw to be tightened each time. In this automatic screw supply mechanism, as shown in FIG. 4, for example, one screw 100 is supplied from a supply unit (not shown) accommodating a large number of screws through the supply passage 101 by using compressed air or the like, and the bit passage 102 is provided. It is configured to be automatically fed toward the tip inside.

Then, the fed screw 100 is fixed and held by the holding member 106 and the pressing member 103 at the tip in the bit passage 102, and the head of the screw 100 moves forward in the bit passage 102. After engaging with the tip of the bit (not shown), the pressing member 103 and the holding member 106 are pushed open against the elastic force of the spring 104 and the spring 107 shown in FIG. It is pushed out to the outside and is tightened by the member 105 to be tightened.

[0004]

[Problems to be solved by the device]

 By the way, in such an automatic screw feeding mechanism, the hole diameter of the passage partly expands at the confluence part with the bit passage of the supply passage, so that the head is in a normal posture with the head facing backward in the supply passage. There is a case that the screw sent out in is reversed at the confluence part and held in the opposite posture.

Further, even if the posture of the screw does not collapse at the merging portion, the pressure feeding force increases at the merging portion to increase the acceleration, or as a result of a strong collision with the bit passage of the merging portion, the screw is fed with a large force. There is also a possibility that it cannot be held by the holding part and is ejected to the outside as it is.

In view of the above-mentioned circumstances, the present invention has an object to provide a screw holder for an automatic screw tightener that can surely catch and hold the screw in a normal posture. Is.

[0007]

[Means for Solving the Problems]

 That is, in order to tighten the screw that has been pressure-fed from the screw supply device through the insertion passage with the bit that passes through the suction sleeve, the screw holder for the automatic screw tightener that receives and holds the pressure-fed screw in an appropriate posture. And a joint member that is fixed to the chuck body at the tip of the automatic screw tightener body and is rotatably attached to the chuck body and a joint member that is connected to the tip of the insertion passage. A claw member that is urged by an elastic force in a direction to be in communication with the joint member, and is rotatably attached to the chuck body. The bit has a taper surface for rotating the pawl member to an angle at which the bit can enter, and a connecting member connected to the pawl member is provided.

[0008]

[Action]

 In this invention, the elastic force in a fixed direction is constantly urged by the spring, and the screw fed from the screw feeder through the insertion passage is fed to the pawl member which is in communication with the joint member. The taper surface is pushed in by the forward movement of the sleeve and the connecting member is rotated, and accordingly, the claw member is also rotated to the angle at which the bit can enter. After that, the bit advances and advances through the suction sleeve, and the screw held by the pawl member is tightened by the bit.

[0009]

【Example】

 The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing a screw holder for an automatic screw tightener according to the present invention. The screw holder of this embodiment has a joint member 2 fixed to the chuck body 1 at the tip of the automatic screw tightener body, a claw member 3 rotatably attached to the chuck body 1, and a screw member attached to the chuck body 1. It is provided with a connecting member 4 which is movably attached and connected to the claw member 3. In the figure, reference numeral 5 is an adsorption sleeve that adsorbs the screw 6 held by the claw member 3 and through which a bit (not shown) is inserted.

The claw member 3 holds the screw 6 fed from the joint member 2, and can rotate about a rotation shaft 11 provided in the chuck body 1. Further, a torsion spring 12 is attached to the rotating shaft 11, and normally the elastic force in a constant direction is always urged by the torsion spring 12 (clockwise direction in this embodiment) so as to be in communication with the joint member 2. is there. Further, this screw holder is provided with an opening / closing mechanism (not shown) that is opened by the forward movement, that is, the pushing operation of the suction sleeve 5 that sucks the screw 6.

The connecting member 4 is composed of a plate-shaped member having a tapered surface 4 A provided in a part thereof, and is rotatably attached to a shaft 41 provided in the chuck body 1. Further, a long hole 42 is formed in the connecting member 4, and the slide pin 31 attached to the claw member 3 is inserted into the long hole 42.

Next, the operation of this embodiment will be described with reference to FIGS. 1 to 3. The screws 6, which have been fed one by one from a screw supply device (not shown) in a predetermined correct posture, pass through the joint member 2 and are fed to the claw member 3 and then held as they are (see FIG. 1). In this case, since the claw member 3 is biased by the torsion spring 12 in the clockwise elastic force, the claw member 3 is stationary at the position where the slide pin 31 is locked at the right end in the elongated hole 42, and is just right. Here, the claw member 3 and the joint member 2 are in communication with each other.

Next, as the suction sleeve 5 descends as shown in FIG. 2 and the tip portion 5A contacts the taper surface 4A of the connecting member 4, the taper surface 4A is pushed, so that the connecting member 4 is Rotate clockwise while being pressed. As a result, the claw member 3 connected via the slide pin 31 also rotates counterclockwise while sliding in the slot 42 while holding the screw 6 held in the correct posture (FIG. 2). reference).

As shown in FIG. 3, the claw member 3 which rotates in this way stops the rotation of the connecting member 4 when the tapered surface 4A is engaged with the outer peripheral surface 5B of the suction sleeve 5, so that the claw member 3 rotates simultaneously. Motion stops. In this way, the claw member 3 rotates right below the suction sleeve 5, so that the suction sleeve 5 that is descending smoothly enters the claw member 3 and sucks the head of the screw 6 that is being held. To do.

After that, a bit (not shown) descends in the suction sleeve 5, and the screw 6 held in a correct posture is accurately tightened to a member to be tightened (not shown).

[0016]

[Effect of device]

 As described above, according to the present invention, after the elastic force in the constant direction is constantly urged by the spring and the screw is fed from the screw feeding device to the claw member in the communicating state with the correct posture, As the taper surface is pushed by the suction sleeve and the connecting member rotates, the claw member also rotates to the angle at which the bit enters, and the bit that has passed through the suction sleeve is held in the correct posture by the claw member. Since the screws can be tightened accurately, it is possible to provide a highly reliable automatic screw tightener.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a screw holder for an automatic screw tightener according to the present invention.

FIG. 2 is an explanatory view showing the operation of this invention.

FIG. 3 is an explanatory view showing the operation of this invention.

FIG. 4 is a sectional view showing a conventional example.

5 is a plan view of the conventional example shown in FIG.

[Explanation of symbols]

 1 chuck body 3 claw member 4 connecting member 5 suction sleeve 6 screw 12 torsion spring

Claims (1)

[Scope of utility model registration request] 1. A screw holder for an automatic screw tightener, which receives and holds the pressure-fed screw in a proper posture so as to tighten the screw that has been pressure-fed from the screw supply device through the insertion passage with a bit that passes through the suction sleeve. Machine, which is fixed to the chuck body at the tip of the automatic screw tightener body, is rotatably attached to the chuck body and a joint member connected to the tip of the insertion passage, and is normally fixed by a spring. Directional elastic force is applied to the claw member that is in communication with the joint member, and is rotatably attached to the chuck body, and is pushed and rotated by the advancing operation of the suction sleeve to allow the bit to enter. An automatic screw tightener having a taper surface for rotating the claw member to a possible angle and having a connecting member connected to the claw member. Holding machine.