JPH0763856B2 - Natsuto Fida supply head - Google Patents

Description

TECHNICAL FIELD The present invention relates to a feeding head of a nut feeder for feeding a welding nut to a welding position of a work.

<Prior Art> As a supply head for a nut feeder of this type, conventionally, an electromagnetic coil is provided in the main body of the supply head, and the tip of a rod that can move forward and backward is temporarily magnetized by this electromagnetic coil, and the nut is sent through a chute. There is known a feed head having a structure in which the rod is magnetically attracted to the tip of the rod and the rod is pushed out to a welding position to feed the rod.
56-14943, etc.).

<Problems to be Solved by the Invention> However, since this type of supply head has an electromagnetic coil built in the head body, the structure of the supply head body becomes large and complicated, and the rod head Since the material had to be a magnetic material such as iron, the weight became heavy, and it was necessary to strengthen the bracket or the like for fixing the supply head at a predetermined position. In addition, the magnetism and magnetic force generated by the electromagnetic coil must be controlled when holding and releasing the nut, so a control circuit is required for that purpose, and the electromagnetic coil must be adjusted according to the type and size of the nut. There was a problem such as the need to adjust the current value of.

Also known is a feed head having a structure in which a rod is skewered into a hole of a nut for feeding, but in this skewered method,
After projecting the rod, the nut is dropped by its own weight and placed at a fixed position, so it is necessary to increase the projecting speed of the rod, and the speed of the nut when reaching the fixed position is large and stable. There was a problem that it was difficult to supply nuts.

The present invention has been made to solve the above-mentioned problems, and the structure of the supply head main body can be simply and lightened without using an electromagnetic coil, and the welding nut can be stably supplied to the welding position. It is an object of the present invention to provide a feeding head of a nut feeder that can be used.

<Means for Solving the Problems> In order to achieve the above-mentioned object, in the supply head of the nut feeder of the present invention, a rod that is moved forward and backward by a fluid pressure cylinder is provided in a cover cylinder fixed to a main body block. An air cushion hole is provided in the fluid pressure cylinder, a passage through which a rod passes is formed in the main body block, and a chute for feeding a nut to the front part of the passage is connected to the main body block. At the front part of the block, a door for opening and closing the front of the passage is provided with a gap for air venting, and at the tip of the rod, there is provided a nut support part having a serrated head at the tip of the rod part. The diameter of the base of the ribbed head is made slightly larger than the diameter of the rod and slightly smaller than the hole diameter of the nut, and the length of the rod is made slightly longer than the thickness of the nut. At this time, the nut support portion is inserted into the nut, and the rod portion supports the nut to supply the nut.

<Operation> When the fluid pressure cylinder is pushed out and the rod is pushed out while the nut is fed from the chute and positioned inside the passage of the main body block, the nut support part at the tip of the nut enters the hole of the nut, Is hung on the rod part of the nut support part and pushed forward. At this time, even when the rod is tilted forward, the nut hits the crevice-shaped head and is fed while being supported without falling. When the nut reaches a fixed position on the work, the rod stops moving forward, and the nut rotates forward due to its inertial force and its own weight, moves away from the serrated head, and is placed in the fixed position on the work. To be done.

<Example> Hereinafter, an example of the present invention is described based on a drawing.

FIG. 4 shows a perspective view of the feeding head of the nut feeder,
FIG. 1 shows a sectional view in the longitudinal direction. This supply head is provided at the rear portion of the main body block 1 to which a chute 3 to which a welding nut (hereinafter referred to as a nut) is fed is connected.
A fluid pressure cylinder 4 is fixed via a cover cylinder 2, and a rod 6 connected to the tip of a piston rod 5 of the fluid pressure cylinder 4 is arranged so as to project from the inside of the body block 1 through the inside of the cover cylinder 2. To be done.

A passage 8 through which the rod 6 passes is formed in the main body block 1, a chute 3 is connected to the front portion of the passage 8 from above, and a double door 7 is provided to open and close a front opening portion of the passage 8. The shaft 7 is attached to the shaft 9 so as to open on both sides (Fig. 2). The doors 7, 7 are formed in a substantially L shape in a plan view, and when closed, have a wall portion 7a on the lower side in order to stop the nut 20 sent from the chute 3 at the front position of the passage 8. Have

Therefore, the nut 20 sent from the chute 3 is
It comes into contact with 7a and stops at the front position of the passage 8. Further, as shown in FIG. 2, the doors 7, 7 are always urged in the closing direction via the coil springs 10, 10 and the balls 11, 11 and opened by the pressing force of the nut or rod 6. In addition, a gap is formed at the mating portion of the doors 7 and 7, and the passage 8 is formed when the rod is pushed out.
Let the air inside escape from the gap. As a result, when the nut 20 is pressure-fed by air or the like, the air pressure causes the doors 7 and 7 to move.
Can be prevented from being accidentally opened, and problems such as an abnormal posture of the nut due to blowback of air can be prevented.

The cover cylinder 2 is fixed to the rear portion of the main body block 1 by bolts 12, and a bearing 13 for slidably supporting the rod 6 is provided therein.

At the tip of the rod 6, a nut support portion 15 having a serrated head portion 15b at the tip of the rod portion 15a is formed. As shown in FIG. 5, the rod portion 15a of the nut support portion 15 has a diameter L1 smaller than the inner diameter L2 of the nut 20 and a length L3 slightly longer than the thickness (height) L4 of the nut 20. It is formed. In addition, the ribbed head 15b at the tip has a diameter L5 at its base that is the diameter L1 of the rod 15a.
It is formed to be slightly thicker and smaller than the inner diameter L2 of the nut 20. Further, since it is ribbed, its base has a spherical shape, and its tip is formed in a substantially conical shape. The diameter L6 of the rod 6 is smaller than the outer diameter of the nut 20 and its inner diameter L2.
It is formed larger.

Therefore, when the rod 6 is pushed out at the time of supplying the nut, the nut supporting portion 15 is inserted into the hole of the nut 20 located in the front portion of the passage 8, and the nut 20 is the rod portion of the nut supporting portion 15.
It is hung on 15a and pushed out.

A fluid pressure cylinder 4 is fixed to a rear end portion of the cover cylinder 2, and a rear end of the rod 6 is connected to a tip end of a piston rod 5 of the cover cylinder 2. The fluid pressure cylinder 4 operates to push or pull back the rod 6. To do. An air cushion hole 4a is provided inside the tip end side of the fluid pressure cylinder 4, and the piston is braked at the pushing end of the piston rod 5 during the pushing operation, and the piston stops without a shock due to the air cushion action. It is a structure that reduces impact noise.

The supply head configured as described above is arranged so as to incline downward so that its front portion is directed to a predetermined position (position where the guide pin 22 projects) on the work 21 for welding the nut 20. It Then, when the rod 6 is pushed out, the crevice-shaped head portion 15b of the nut support portion 15 is positioned so as to stop exactly above the tip of the guide pin 22. Head 15b
Since it is formed in a rugged shape and its tip is easier to understand than a sphere, it is easy to align with the tip of the guide pin 22. The chute 3 is connected to a separating / feeding device of a nut feeder (not shown) via a feed hose.

The nut 20 fed by air or the like passes through the chute 3 and enters the front part of the passage 8 of the main body block 1 in a certain posture with its upper surface facing the rod 6 side, and the wall below the doors 7, 7. It hits the portion 7a and stops, and is held at that position.

Next, the fluid pressure cylinder 4 operates to push out the piston rod 5, which pushes the rod 6 forward (6th
Figure). At this time, the nut support portion 15 at the tip of the rod 6 advances while entering the hole of the nut 20, and pushes the doors 7 on both sides open by the forward force, so that the nut 20 is hooked on the rod portion 15a of the nut support portion 15. In this state, the rod 6 advances toward the tip of the guide pin 22 of the work 21. At this time, the rod 6 inclines forward obliquely and moves forward, but since the nut 20 hits the crevice-shaped head portion 15b of the nut support portion 15, it is held there without falling. Further, when the nut 20 pushes open the doors 7 and 7 and is released from the pressing force of the coil springs 10 and 10, as a reaction thereof, a force for pushing the nut 20 forward acts. Then, the nut 20 is on the rod portion 15a of the nut support portion 15,
The difference between the rod length L3 and the nut thickness (height) L4, L7 (Fig. 5), is the sliding force (friction force) and the abutment force on the serrated head 15b. It absorbs the reaction force and prevents the nut 20 from jumping out.

When approaching the push-out end of the fluid pressure cylinder 4, the advancing speed of the piston rod 5 is reduced by the air cushion action, and the crevice-like head portion 15b at the rod tip is moved to the work 2
When it reaches directly above the guide pin 22 of 1, the piston rod 5 and the rod 6 gently stop without impact. At this time, the lower end of the nut 20 supported by the nut support portion 15 is applied to a part of the work or the guide pin, and the nut 20 rotates forward with its contact point as a fulcrum due to its inertial force and its own weight. This will allow the nut 20 to engage the guide pin in its hole.
Land at a fixed position on the work so that the tip of 22 is inserted.

Since the tip of the nut support portion 15 is a serrated head 15b and its base is spherical, the nut 20 has a chamfered head inside.
Glide well on 15b, nut 20 works well on nut support 1
It leaves 5 and is placed in a fixed position on the work.

In this way, the nut 20 is hung on the rod portion 15a of the nut support portion 15 provided at the tip of the rod and fed, and the nut 20 is rotated forward by sliding the nut 20 at the forward end of the rod 6 so that its crenellated head portion 15b slides. Since it is placed at a fixed position on the work 21, there is no need to limit the forward speed of the rod 6 compared to the conventional skewer feed head, a wider range of speeds can be selected, and it is stable and reliable. The nut can be placed in place.

The rod 6 that has finished supplying the nut 20 is the fluid pressure cylinder 4
Is returned to its original position in the cover cylinder 2, at which time the door 7 of the main body block 1 is closed by the biasing force of the coil spring 10 and the next nut enters the front part of the passage 8 and thereafter The same operation is repeated, and the nut is supplied to a fixed position on the work for each operation.

In the above-described embodiment, the nut is supported by the nut supporting portion at the tip of the rod 6 at an arbitrary inclination angle with respect to the fixed position of the workpiece and supplied, but as shown in FIG. Moreover, it is possible to supply the nut even when the rod 6 is horizontal.

<Effects of the Invention> As described above, according to the feed head of the nut feeder of the present invention, the tip of the rod is provided with the nut support portion having the grated head at the tip of the rod part, and the grated head is provided. The diameter of the base of the part is formed slightly larger than the diameter of the rod and slightly smaller than the hole diameter of the nut, and the length of the rod is formed slightly longer than the thickness of the nut. Since the nut support is inserted into the nut and the rod is used to support and supply the nut, the nut can be sent to a fixed position on the work without using the magnetic force of the electromagnetic coil. The material may be a material other than a magnetic material, the structure of the supply head can be simple and lightweight, and a control circuit for controlling the electromagnetic coil is unnecessary. Also, compared to the conventional skewered method, the nut is not dropped by its own weight, but is fed onto the work while being supported by the nut support part at the rod tip, so the nut can be stably placed at a fixed position on the work. it can. Further, since there is a gap for removing an error in the door that opens and closes the front surface of the passage, it is possible to prevent the door from being opened carelessly when the nut is pressure-fed, or the posture of the nut being changed by air pressure. Further, since the air cushion hole is provided in the fluid pressure cylinder, the air cushion function is generated at the pushing end of the cylinder, and the nut can be pushed to a predetermined position without generating impact or impact noise.

[Brief description of drawings]

 1 shows an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a supply head, FIG. 2 is a II-II sectional view of FIG. 1, and FIG. 3 is a III-III sectional view thereof. 4 is a perspective view of the supply head, FIG. 5 is an enlarged view of the nut support portion, FIG. 6 is a cross-sectional view at the time of the supply operation, and FIG. 7 is a cross-sectional view at the time of another operation. 1 ... Main body block, 2 ... Cover cylinder, 3 ... Chute, 4 ... Fluid pressure cylinder, 6 ... Rod, 7 ... Door, 8 ... Passage, 15 ... Nut support part, 15a ... Rod Part, 15b ... Head with a crenellated shape.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kaneaki Nakamura 5-22-22 Kanayama, Naka-ku, Nagoya-shi, Aichi Yajima Giken Co., Ltd. (56) References JP-A-57-118875 (JP, A) Actual Kai 53-32830 (JP, U) JP 54-28301 (JP, B2) JP 56-14943 (JP, Y2)

Claims (1)

[Claims] 1. A cover cylinder fixed to a main body block,
A rod that is moved forward and backward by a fluid pressure cylinder is arranged, an air cushion hole is provided in the fluid pressure cylinder, a passage through which the rod passes is formed in the main body block, and a nut is provided in the front portion of the passage. A chute for feeding is connected to the main body block, and a door for opening and closing the front surface of the passage is provided in the front portion of the main body block with a gap for air bleeding. A nut supporting portion having a rib-shaped head is provided, and a diameter of a base portion of the rib-shaped head is formed to be slightly larger than a diameter of the rod portion and slightly smaller than a hole diameter of the nut. A feeding head of a nut feeder having a structure in which the length is formed slightly longer than the thickness of the nut, and when the rod is extruded, the nut supporting portion is inserted into the nut and the rod portion supports the nut to feed the nut.