JP2023160257A - chuck unit - Google Patents

Abstract

To provide a chuck unit that can smoothly supply a screw up to a holding hole.SOLUTION: A chuck unit 10 comprises a chuck main body 20 that guides a fastening tool 90 that can be fitted to fastening components S or an adsorbing pipe 91 including the fastening tool 90, and a pair of holding claws 40 and a pair of connecting claws 30 oscillatably supported on the chuck main body 20. Holding holes 41 which can hold the fastening components S on an axis line of the fastening tool 90 or of the adsorbing pipe 91 are divisionally formed on a surface which the holding claws 40 opposes to. The chuck main body 20 is provided with a supply hole 22 extending in a direction crossing an oscillation surface of the connecting claws 30. Connection holes 31 through which the supply hole 22 is connected to the holding holes 30 are divisionally formed on the surface which the connecting claws 30 oppose to.SELECTED DRAWING: Figure 3

Description

The present invention relates to a chuck unit that can stably receive supplied screws.

BACKGROUND ART Conventionally, a chuck unit 200 disclosed in Patent Document 1 is known as a chuck unit 200 that holds a screw S fed under pressure from a predetermined feeding device on a movement path of a driver bit 90. As shown in FIG. 11, such a chuck unit 200 includes a swing pipe 201 disposed on the movement path of the driver bit 90, and a chuck claw 202 in which a holding hole 203 continuous with the swing pipe 201 is formed separately. The swing pipe 201 was configured to be able to swing by being pressed by the driver bit 90 as shown by the two-dot chain line. Therefore, the screw S supplied from an external supply device passed through the swing pipe 201 and the holding hole 203 of the chuck claw 202, and was held on the axis of the driver bit 90.

Japanese Patent Application Publication No. 2013-107159

However, in the conventional chuck unit, as shown in FIG. 11, the holding hole 203 of the chuck claw is configured to have a hole diameter through which the suction pipe 33, which is larger than the outer diameter of the screw S, can be inserted. Since there is a gap between them, the screw S sometimes loses its posture within the holding hole 203. Moreover, the passage path of the screw S is bent at the joint between the swing pipe 201 and the holding hole 203 of the chuck claw 202, and has a tapered surface that moves the screw S in contact with the entrance portion of the holding hole 203 toward the tip side. It is provided. Therefore, the gap between the swing pipe 201 or the holding hole 203 and the screw S is large at the joint, and the screw S is particularly likely to lose its posture. The screw S whose posture has deteriorated in the chuck in this way becomes clogged at the joint between the swing pipe 201 and the holding hole 203 of the chuck jaw 202 or inside the chuck jaw 202, as shown by the two-dot chain line in FIG. The problem was that it caused

The present invention was created in view of the above problems, and provides a chuck unit that can smoothly supply screws to holding holes. In order to achieve the object, the present invention provides a chuck body having a guide hole for guiding a fastening tool that can engage with a fastening part and a supply hole extending in a direction intersecting the guide hole, and a chuck body that is supported in an openable and closable manner. In the chuck unit, the chuck unit is provided with a pair of holding pawls, and a holding hole that is capable of holding the fastening component on the axis of the fastening tool is separately formed on an opposing surface of the holding pawl. A pair of connecting pawls configured to be openable and closable are provided between the connecting pawls, and a connecting hole that connects the supply hole and the holding hole in a closed state is formed on the opposing surface of the connecting pawls. It is characterized by the presence of In addition, it is preferable that the holding claw and the connecting claw are swingably supported by a support shaft fixed to the chuck body. Further, it is preferable that the distal end surface of the connecting pawl is formed into a curved surface centered on the pivot axis of the swing. Furthermore, it is preferable that the holding claw has a sliding surface parallel to the tip end surface of the connecting claw. Moreover, it is preferable that the connecting claw is formed with a tapered part that the fastening tool comes into contact with. Further, it is preferable that the connecting claw is provided with a locking portion that locks only the holding claw from opening. Furthermore, it is preferable that an adjustment screw for adjusting the position in the closed state is fixed to at least one of the connecting claw and the holding claw.

According to the chuck unit of the present invention, a connecting hole through which a fastening part passes is formed on the opposing surface of the pair of connecting claws provided between the chuck body and the holding claw, and the connecting hole is aligned with the screw. Since it can be designed freely, it has the advantage of being able to stably supply screws. In addition, since the holding pawl and the connecting pawl are supported in a swingable manner, there is an advantage that there is no need to prepare a separate drive source and control becomes easy. In addition, since the distal end surface of the connecting pawl is formed into a curved surface, there is an advantage that when the connecting pawl swings, the connecting pawl and the holding pawl are prevented from interfering with each other, allowing for smooth rocking. Further, since the sliding surface of the holding claw is also formed into a curved surface parallel to the tip end surface, the gap between the connecting hole and the holding hole becomes narrower, and the screw can be fed more smoothly. Furthermore, since the connecting pawl is formed with a tapered portion, there is an advantage that it can be easily swung by a suction pipe, a fastening tool, etc. Further, since the connecting claw is provided with a locking part that locks the holding claw so that only the holding claw does not open, there are advantages such as preventing the holding claw from being pushed open by the force-fed screw. There is also. Furthermore, since the adjustment screw allows adjustment of the stoppage of rocking of the holding pawl and the connecting pawl, there is an advantage that screws can be fed smoothly.

1 is a side view showing the structure of a screw tightening machine according to the present invention. FIG. 2 is an enlarged side view of main parts showing the structure of the chuck unit according to the present invention. FIG. 2 is an enlarged partial cross-sectional side view of the main part showing the structure of the chuck unit according to the present invention. 4 is a partially sectional plan view taken along line AA in FIG. 3. FIG. FIG. 5 is a partially sectional plan view showing the operation of transitioning from FIG. 4 to the next state. FIG. 6 is a partially sectional plan view showing the operation of transitioning from FIG. 5 to the next state. FIG. 7 is a partially sectional plan view showing a second embodiment of the chuck unit of the present invention. FIG. 7 is a partially sectional plan view showing a third embodiment of the chuck unit of the present invention. FIG. 9 is a partially sectional plan view showing the operation of transitioning from FIG. 8 to the next state. 9 is a side view showing the structure of a screw tightening machine using the chuck unit shown in FIG. 8. FIG. FIG. 2 is a partially sectional side view showing the structure of a conventional chuck unit.

Embodiments of the present invention will be described below based on the drawings. In FIGS. 1 to 6, 10 is a chuck unit 10 provided in a screw tightening machine 100, etc., and is configured to be able to temporarily hold a screw S, which is an example of a fastening component supplied from an external supply device (not shown). has been done. This chuck unit 10 has a chuck body 20 fixed on a moving path of a suction pipe 91, which will be described later, and a connecting claw 30 and holding claws 40, 40 that are swingably attached to this chuck body 20. ing.

The screw tightening machine 100 includes a driver bit 90 that can be fitted with the screw S, and a cylindrical suction pipe 91 that encloses the driver bit 90. This suction pipe 91 is connected to a suction means (not shown) such as a negative pressure generator, and is configured to be able to suction and hold the screw S inside the suction pipe 91 by driving this suction means. There is. Further, the driver bit 90 and the suction pipe 91 are connected to a reciprocating drive section 92 and configured to be able to reciprocate in the axial direction. Further, a rotary drive source 93 is connected to the base end of the driver bit 90, and the driver bit 90 is configured to be rotatable inside the suction pipe 91 when driven by the rotary drive source 93. .

Note that the suction pipe 91 is always urged toward the tip side by a cushion spring (not shown), and when the cushion spring is bent, it moves relative to the driver bit 90 in the axial direction, and the driver bit is removed from the tip. The bit 90 is configured to protrude. Further, the suction pipe 91 has a small diameter portion 911 formed through a tapered inclined portion whose diameter decreases toward the tip thereof.

A guide hole 21 is formed through the chuck body 20 on the movement path of the suction pipe 91 . This guide hole 21 is configured to have a hole diameter slightly larger than the maximum diameter of the suction pipe 91, and is configured such that the suction pipe 91 can be freely inserted in the axial direction. Further, the chuck body 20 is formed with supply holes 22 that are inclined with respect to the guide holes 21 and whose extension lines intersect with each other. A supply hose 94 extending from the supply device is continuous with the supply hole 22, and the supply hole 22 and the supply hose 94 continuous with the supply hole 22 are such that a screw S can pass therethrough and the screw S can pass through the inside thereof. The diameter of the hole is set so that the hole is not inclined at an angle of more than 45 degrees with respect to these. Furthermore, first support grooves 23, 23 and second support grooves 24, 24 are formed on both side surfaces of the chuck body 20 in parallel with the guide hole 21, as shown in FIG. The first support grooves 23, 23 are provided so as to sandwich the guide hole 21, and each of the connecting claws 30 is swingably supported. On the other hand, the second support grooves 24, 24 are provided at positions farther from the supply hole 22 than the first support grooves 23, 23, and the holding claws 40, 40 are supported in a swingable manner, respectively. Moreover, a mounting screw 25 passing through the support grooves 23 and 24 is fixed to the chuck body 20, and the connecting claw 30 and the holding claws 40 and 40 swing about the mounting screw 25 as a support shaft. .

The connecting claw 30 is always urged to close one end side by claw springs 34, 34 which are sandwiched between the connecting claw 30 and the chuck body 20, and the supply hole 22 of the chuck body 20 is formed on the opposite surface thereof. A continuous connecting hole 31 is formed in sections. This connecting hole 31 is gently curved internally, and is configured such that one end side is continuous with the supply hole 22 and the other end side is continuous with a holding hole 41, which will be described later. In addition, the hole diameter of the connection hole 31 is such that the screw S can pass through the inside thereof like the supply hole 22 and the supply hose 94, and the screw S passing through the inside thereof is not inclined at an angle of more than 45 degrees with respect to these. It is set like this. Furthermore, a tapered portion 32 is formed in sections on the connecting claw 30 at a position facing the suction pipe 91 . This tapered portion 32 has a tapered conical shape formed on the movement path of the suction pipe 91, and its maximum diameter portion is configured to have a larger diameter than the small diameter portion 911 of the suction pipe 91. Therefore, by moving the suction pipe 91 further forward with its small diameter portion 911 in contact with the tapered portion 32, it becomes possible to smoothly push open the connecting claw 30.

Like the connecting claws 30, the holding claws 40, 40 are always urged to close one end side by a claw spring (not shown) interposed between the chuck body 20 and the opposite surface thereof. The holding hole 41 located on the extension line of the suction pipe 91 is formed in sections. This holding hole 41 is formed to have a hole diameter larger than the outer diameter of the small diameter portion 911 of the suction pipe 91, and a guide portion 42 is formed at one end thereof. This guide portion 42 is configured to have a diameter smaller than the head diameter of the screw S and larger than the neck diameter of the screw S, and as shown in FIG. is configured to accept. Further, the holding hole 41 has an axial dimension shorter than the axial dimension of the small diameter portion 911, so that when the small diameter portion 911 of the suction pipe 91 comes into contact with the connecting claw 30 during driving, which will be described later. The small diameter portion 911 contacts the inside of the holding hole 41 .

As shown in FIG. 4, the connecting claw 30 has a distal end surface 33 that slides with the holding claws 40, 40, which is formed into an arcuate convex curved surface centered on the mounting screw 25; 40, 40, a sliding surface 43 that slides on the tip end surface 33 of the connecting claw 30 is configured as a concave curved surface along an arc centered on the mounting screw 25. Therefore, as shown in FIGS. 5 and 6, the connecting claw 30 and the holding claw 40 do not interfere with each other and can freely swing. Further, no gap is generated between the recess of the connecting hole 31 and the holding hole 41, and the screw S can be prevented from getting caught in the gap.

Next, the operation of the chuck unit 10 configured as described above will be explained.
When the drive signal is input, the supply device force-feeds the screw S toward the chuck unit 10. This force-fed screw S reaches the connecting hole 31 through the supply hose 94 and the supply hole 22. The screw S that has reached the connecting hole 31 in this way changes direction along the connecting hole 31 and is supplied to the holding hole 41. Moreover, since the connecting pawl 30 is biased in the closing direction by the pawl spring 34, it is prevented from opening due to the impact caused when the screw S passes.

When feeding the screw S as described above, the diameter of the connecting hole 31 and the holding hole 41 are designed based on the outer diameter of the head of the screw S as described above, so the screw S may change its posture during feeding. Hard to break down. Further, since the connecting hole 31 is gently curved so as to connect the supply hole 22 and the holding hole 41, there is no bend at the boundary between the connecting hole 31 and the supply hole 22, and the hole diameter is partially enlarged. Not at all. Therefore, the screw S is guided by the supply hole 22 and the connection hole 31 and can stably reach the holding hole 41. Further, since the holding claws 40, 40 are urged in the closing direction by the claw spring, the supplied screw S is prevented from pushing open the holding claws 40, 40 and jumping out to the outside. Further, as described above, both the distal end surface 33 of the connecting claw 30 and the sliding surface 43 of the holding claw 40 are configured in an arc shape centered on the mounting screw 25, so that the connecting hole 31 and the holding hole 41 are connected to each other. Since the gap becomes narrow, the screw S is smoothly supplied to the holding hole 41 without getting caught in the gap.

After the screw S is supplied to the holding hole 41 as described above, the reciprocating drive section 92, the rotational drive source 93, and the suction means are activated to cause the rotation of the driver bit 90 and the rotation of the driver bit 90 and the suction pipe 91. The forward movement toward the screw S and the suction operation from the opening of the suction pipe 91 are started. The suction pipe 91 that has advanced in this manner comes into contact with the connecting claw 30 that closes the front end of the suction pipe 91 and pushes it open outward in the swinging direction. At this time, since the connecting claw 30 is formed with a tapered portion 32 having a tapered shape, and the small diameter portion 911 of the suction pipe 91 enters the tapered portion 32, the connecting claw 30 can swing smoothly. . For this reason, when the connecting claw 30 is opened, the cushion spring that urges the suction pipe 33 is difficult to bend, and when the connecting claw 30 opens and the resistance becomes weak, the suction pipe 33 is activated by the reaction force of the deflected cushion spring. It is possible to prevent the suction pipe 33 from moving forward and from colliding with the screw in the holding hole 41 and being thrown out. In addition, the distal end surfaces 33, 33 of the connecting claws 30 are formed into arcuate convex curved surfaces, which prevent the distal end surfaces 33, 33 from coming into contact with the holding claws 40, 40 during rocking. Therefore, when the connecting claw 30 swings, the holding claw opens and the screw is prevented from falling off.

After the connecting claw 30 is pushed open as described above, the suction pipe 91 is driven further by the reciprocating drive section 92 and moves forward. As a result, the small diameter portion 911 at the tip of the suction pipe 91 enters the holding hole 41 . At this time, the suction means is being driven and air is being sucked in from the opening of the suction pipe 91, so the screw S held in the holding hole 41 is suctioned into the suction pipe 33. The suction pipe 91 that has suctioned and held the screw S in this way moves forward further under the drive of the reciprocating drive unit 92, and as shown in FIG. It protrudes from the tip of the unit 10. At this time, the holding claws 40, 40 and the connecting claws 30, 30 swing around the same mounting screw 24, and their respective sliding surfaces 43, 43 and tip surfaces 33, 33 are both configured in an arc shape. Therefore, the holding claws 40 can also swing smoothly like the connecting claws 30 without interfering with each other. As a result, while the suction pipe 33 is caught by the holding claw 40 and stopped, the driver bit 90 moves forward, thereby preventing the driver bit 90 from coming into contact with the screw and being pushed out from the suction pipe 33. Thereafter, when the suction pipe 91 that moves forward toward the workpiece due to the drive of the reciprocating drive unit 92 comes into contact with the workpiece, the cushion spring is bent and the driver bit 90 moves relative to the suction pipe 91. It abuts against the screw S held within the holder 91. At this time, since the driver bit 90 is rotating under the drive of the rotary drive source 93, it fits into the screw S and fastens the screw S to the workpiece.

Hereinafter, a chuck unit 10' which is a second embodiment will be described based on FIG. 7.
In this chuck unit 10', opening preventing members 51, 51 are attached to the outside of the connecting claw 30 in the swinging direction, and the tips of the opening preventing members 51, 51 are used to prevent the holding claws 40, 40 in the swinging direction. It is pressed from the outside. Therefore, when the holding claws 40, 40 swing, the connecting claw 30 is also opened via the opening prevention members 51, 51, that is, only the holding claws 40, 40 are prevented from swinging. As a result, when the screw S supplied from the supply device hits the holding claws 40, 40, the holding claws 40, 40 are held down from the outside in the swinging direction by the connecting claw 30 as described above, so that they cannot open. There is no. In this way, the supplied screw S is prevented from jumping out of the chuck unit 10'. Further, since the screw S is prevented from popping out, it becomes possible to force-feed the screw S more quickly, reducing cycle time and improving work efficiency.

Further, in the chuck unit 10', adjustment screws 52, 52, etc. are attached to the holding claws 40, 40 and the connecting claws 30. The adjustment screws 52, 52 extend toward the chuck body 20 from the outside in the swinging direction of the holding claws 40, 40 and the connecting claw 30, respectively, and their tips are attached to the bottom surfaces of the support grooves 23, 24 of the chuck body 20. is in contact with This allows the holding claws 40, 40 and the connecting claw 30 to swing with respect to the chuck body 20 by turning the adjusting screws 52, 52 and adjusting the amount of protrusion of the tip portions from the holding claws 40, 40 and the connecting claw 30. The stopping position can be adjusted. Therefore, the holding holes 41 and the connecting holes 31 of the holding claws 40, 40 and the connecting claws 30 can be located on the axis of the driver bit 90. As a result, the supplied screw S is smoothly supplied without being caught in the boundary between the holding hole 41 and the connecting hole 31. Further, since the holding hole 41 is located on the axis of the driver bit 90, there are advantages such as improved fit between the driver bit 90 and the screw S.

Hereinafter, a chuck unit 10'' which is a third embodiment will be described based on FIG. 8.
This chuck unit 10'' is obtained by eliminating the suction pipe 91 from the chuck unit 10'' and changing the guide hole 21' of the chuck body 20' to have a diameter slightly larger than the outer diameter of the driver bit 90. A screw tightening machine (not shown) having this chuck unit 10'' lowers the chuck unit 10'' to the vicinity of the workpiece after the screw S is supplied to the holding hole 41 of the chuck unit 10'', and The configuration is such that only the driver bit 90 is lowered after the chuck unit 10'' is stopped near the workpiece. Therefore, as shown in FIG. 9, the driver bit 90 pushes open the connecting claw 30 and the holding claws 40, 40, making it possible to fasten the screw S to the workpiece. Since such a chuck unit 10'' does not require a suction means continuous to the suction pipe 91, the screw S can be fastened even in an environment where no suction means is available.

Further, the third chuck unit 10'' may be used in a manual screw tightening machine 100' manually operated by an operator as shown in FIG. 10. This manual screw tightening machine 100' includes a fixed shaft 95 that extends in the vertical direction, and a drive rod 96 that is rotatable with respect to the fixed shaft 95 and movable in the radial direction of the fixed shaft 95. A handle portion 97 is attached to the tip of 96 to be held by the operator. Note that a rotary drive source 93 is placed above the handle 97, while a sliding cylinder 98 that slides against it is installed below the handle 97. The unit 10'' is attached to the lower end of the sliding tube portion 98. Therefore, when the operator further lowers the handle part 97 while the lower end of the chuck unit 10'' is in contact with the workpiece and stopped, the driver bit 90 connected to the rotational drive source 93 is moved to the sliding cylinder part 96. Then, it moves downward relative to the chuck unit 10'' and can be fitted with a screw. When the chuck unit 10'' is applied to the manual screw tightening machine 100' in this way, unlike the conventional chuck unit 200 shown in FIG. 11, the swing pipe 201 does not swing and does not obstruct the operator's view. , work efficiency is improved.

Note that the chuck units 10, 10', 10'' according to the present invention are not limited to those described above, and various changes can be made without departing from the spirit of the invention. For example, in the above embodiment, the connecting hole 31 is curved to connect the supply hole 22 and the holding hole 41, but the connection hole 31 is not limited to being curved, and can be bent multiple times to connect the supply hole 22 and the holding hole 41. It may be configured as follows. In this way, unlike the conventional swing pipe 201 and chuck claw 202, the angle does not change greatly at one bent part, but instead makes small angle changes multiple times, making it difficult for the screw S to lose its posture. , a stable supply becomes possible. Further, the screw S is not limited to a machine screw having a head, but may be a set screw or the like without a head, for example. When the screw S is a set screw as described above, it is preferable that the holding hole 41 is configured in the shape of a blind hole in which the tip of the reduced diameter portion 32 is closed. Further, the tapered portion 32 is not limited to a conical shape, and may have any other shape as long as it is tapered.

10... Chuck unit 20... Chuck body 21... Guide hole 22... Supply hole 23... First support groove 24... Second support groove 25... Mounting screw 30... Connecting claw 31... Connecting hole 32... Tapered part 33... Tip surface 34... Claw spring 40... Holding claw 41... Holding hole 42... Guide portion 43... Sliding surface 90... Driver bit 91... Suction pipe 93... Supply hose

Claims (7)

A chuck body having a guide hole for guiding a fastening tool that can be engaged with a fastening part and a supply hole extending in a direction intersecting the guide hole, and a pair of holding claws supported by the chuck body in an openable and closable manner,
In the chuck unit, a holding hole capable of holding the fastening component on the axis of the fastening tool is formed in sections on the opposing surface of the holding claw,
A pair of connecting claws configured to be openable and closable are provided between the chuck body and the holding claw,
A chuck unit characterized in that a connecting hole that connects the supply hole and the holding hole in a closed state is formed separately on an opposing surface of the connecting claw. The chuck unit according to claim 1, wherein the holding claw and the connecting claw are swingably supported by a support shaft fixed to the chuck body. The chuck unit according to claim 2, wherein a tip end surface of the connecting claw is configured to be a curved surface centered on the swinging support shaft. 4. The chuck unit according to claim 3, wherein the holding claw has a sliding surface parallel to a distal end surface of the connecting claw. The chuck unit according to any one of claims 1 to 4, wherein the connecting claw is formed with a tapered portion that a fastening tool comes into contact with. 5. The chuck unit according to claim 1, wherein the connecting claw is provided with a locking portion that locks the holding claw so that only the holding claw does not open. 5. The chuck unit according to claim 1, wherein an adjusting screw for adjusting a position in a closed state is fixed to at least one of the connecting claw and the holding claw.

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