JPS6113258Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chuck for small articles.

For example, when tightening bolts on a workpiece, a nut runner is used. In this nut runner, a bolt feeding device is used to feed the bolt to the bolt joint part of the workpiece, and then the bolt is tightened. The bolt is gripped by gripping claws at the bolt connection site. Figures 1 and 2 show conventional chucks of this type.
In the same figure, 1 is a flat support member having a hole 2 at a predetermined portion and can be moved up and down by an appropriate means, 3 is a guide tube fixed around the hole 2 on the lower surface of the support member 1, and this is: It has an inclined supply hole 4 for supplying bolts on its lower side surface. 5 is the guide tube 3 mentioned above.
A pair of gripping rods 8 is a tapered shape fixed to the lower end of the gripping rod 5, the middle portion of which is pivotably pivoted by a pin 7 in a groove-shaped recess 6 formed at symmetrical positions on both sides. This gripping claw 8 is a gripping claw, and this grasping claw 8 is
It is located at the bottom of the . Reference numeral 9 denotes a spring compressed between the recess 10 formed on the inner surface of the upper end of the gripping rod 5 and the outer peripheral surface of the guide cylinder 3. The spring force of the spring 9 constantly moves the gripping claw 8 at the tip of the gripping rod 5 in the closing direction. Encourage. Reference numeral 11 denotes a bolt supply pipe connected to the supply hole 4 of the guide tube 3. Reference numeral 12 denotes a rotary rod having a square hole 12a on its lower end surface into which a bolt head fits, and is supported by appropriate means so as to be able to move up and down; this is inserted through the hole 2 into the guide tube 3 so as to be able to move up and down. It can be done. When the workpiece a is bolted and fixed to the workpiece body b, the support member 1 is lowered to bring the gripping claw 8 located at the lower part of the guide tube 3 close to the bolted part of the workpiece a, and then air blow etc. The bolt 13 is fed by suitable means via the bolt supply pipe 11 and the supply hole 4 of the guide tube 3.
The fed bolt 13 falls from the supply hole 4 onto the gripping claw 8 as shown in FIG. is grasped. After that, the rotating rod 12 inserted into the guide tube 3 is lowered, the square hole 12a of the lower end surface of the rotating rod 12 is fitted into the bolt head, and the rotating rod 12 is tightened in this state. The bolt 1 is further lowered while rotating in the attachment direction, and the bolt 1 is expanded while the gripping claws 8 are expanded against the urging force.
3 is screwed into the workpiece side, thereby bolting the workpiece a and the workpiece body b. When the bolt tightening is completed in this manner, the support member 1 and the rotary rod 12 rise, return to their original positions, and wait.
However, with this, bolt supply pipe 1
1 and the guide tube 3, the bolt 13 is attached to the guide tube 3.
The patient's inner wall is damaged by a collision, and his posture becomes unstable, causing him to dance or turn over. When tightening the bolt, the gripping claws 8 and the gripping rod 5 expand and rotate outward, so it is difficult to screw the bolt into a narrow space with space constraints, and even if the bolt cannot be screwed in, Even if the gripping claws 8 and the gripping rod 5 interfere with the surroundings, it is necessary to increase the thickness of the gripping claws 8 and the like to withstand the interference, which increases the cost accordingly. Furthermore, guide tube 3
Since the supply hole 4 is integrally formed on the lower side surface of the housing, the processing cost is high, and since the gripping claw 8 does not have elastic force, the bolt fed through the supply hole 4 is attached to the gripping claw 8. receives a shock when being gripped by the
It is difficult to hold the bolt in a constant position all the time, and the gripping position is likely to go awry, so there is a risk that the bolt may not be tightened smoothly.

The present invention is an improvement on the above-mentioned points, and aims to provide a chuck that can grasp and release small objects without interfering with the surroundings even in narrow areas where space is limited. .

The configuration of the present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 3 to 6, 21 is a support member that has a hole 22 at a predetermined portion and is moved up and down by an appropriate means, and 23 is a support member whose middle part is bent into a substantially dogleg shape and is inclined with a hanging part 23a. This supply pipe 23 is a bolt supply pipe provided with a portion 23b, and this supply pipe 23 is connected to the support member 21.
It is inserted into the hole 22 of the support member 21 and supported upright by the mounting member 24, and the bent portion 2
3c, and an insertion hole 26 is formed in a portion of the hanging portion 23a opposite to the tip opening 25, into which a rotating rod that moves up and down, which will be described later, is inserted. Reference numeral 27 denotes a mounting screw screwed into symmetrical positions on both sides of the outer surface of the supply pipe 23 on the upper side of the insertion hole 26, 28 a U-shaped bracket rotatably attached at both ends to the mounting screw, and 29 the above-mentioned bracket. The shutter 29 has a predetermined shape and is fixed at a predetermined portion of the supply pipe 23 and is oscillated about the mounting screw 27 via the bracket 28.
This swinging action causes the supply path 23 of the supply pipe 23 to
d and the insertion hole 26 can be opened and closed. Reference numeral 30 denotes a spring that is attached to the mounting screw 27 and has a semicircular portion 30a aligned with the outer peripheral surface of the supply pipe 23, and both ends of the spring are attached to the bracket 28.
The shutter 39 is always urged toward the insertion hole 26 through the bracket 38 by the spring force of the spring 30, and the insertion hole 26 is kept closed. Reference numeral 31 denotes gripping claws made of plate springs attached to the outer peripheral surface of the tip opening edge 25a of the hanging portion 23a, which is the terminal end of the supply path 23d constituted by the supply pipe 23, and which is made of a plate spring and has a cross section at the tip. It has a dogleg-shaped claw portion 32. Each of the gripping claws 31 is
The upper end 31a is fixed by a ring-shaped needle 33, and the intermediate bent part 31b is fixed by a ring-shaped spring member 34 at the tip opening edge 25a.
A constant inward force is applied to c to hold it in an inwardly closed state. 35 is a square hole 35a into which a head 36a of a bolt 36, which is a small item, is fitted into the lower end surface.
The rotary rod is supported by a support member 37 so as to be able to rise and fall, and is inserted into the hanging portion 23a of the supply pipe 23 through the insertion hole 26 so as to be movable forward and backward and retractable. A pipe 38 is connected to the open end of the inclined portion 23b of the supply pipe 23.

The operating state of the chuck according to the present invention will be explained as follows.

When the bolted part of the workpiece a and the workpiece body b is located directly below the bolt supply pipe 23, the support member 21 is lowered, and the gripping claws 31
Only the supply pipe 23 moves downward until it approaches the workpiece a. At this time, the shutter 29 is urged toward the insertion hole 26 via the bracket 28 by the spring force of the spring 30, and
is occluded. When the supply pipe 23 is stopped at a fixed position, the bolt 36 is inserted into the supply pipe 23 through the pipe 38 by an appropriate means such as air blowing.
sent to. Then, the bolt 36 is connected to the supply pipe 2
The tip opening 2 of the hanging portion 23a passes through the open supply path 23d of No. 3 and is the terminal end of the supply path 23d.
5, the threaded portion 36b is gripped by the claw portion 32 of the gripping claw 31. When the bolt 36 is gripped, the bolt 36 is held by the gripping claw 31 made of a plate spring.
Because it is elastically expanded and gripped by the spring action of
The bolt 36 is not subjected to any impact, so the bolt 36 is always held in an upright position. When the bolt 36 is gripped by the gripping claw 31 in this way, the support member 37 is lowered, and the rotary rod 35 moves downward while pushing open the shutter 29 against the urging force of the spring 30. The bolt head 36a gripped by the gripping claw 31 fits into the square hole 35a on the end face. At this time, the supply path 23d of the supply pipe 23 is closed by the shutter 29. Then, the rotating rod 35 rotates and descends until the bolt head 36a comes into contact with the upper surface of the workpiece a, and the gripped bolt 36 passes through the hole a' of the workpiece a and into the screw hole b' of the workpiece body b. As a result, the workpiece a is bolted and fixed to the workpiece body b. When screwing the bolt 36 into the screw hole b' of the workpiece body b, each gripping claw 31 touches the tip opening edge 25 of the supply pipe 23.
However, since the gripping claws 31 are flat springs that are contracted inward, they do not expand beyond the outer diameter of the supply pipe 23. When the bolt connection between the workpiece a and the workpiece body b is completed, the supply pipe 23 and the rotary rod 35 rise and return to their original positions and wait, and the gripping claws 31 are returned to their original size by the spring force. is maintained in the same state.

In the above embodiment, the chucks are arranged vertically, but the present invention is not limited thereto, and may be arranged diagonally or horizontally. In addition, although the above embodiment describes the case where the chuck according to the present invention is applied to a nut runner, the present invention is not limited to this, and can be applied to all kinds of things that use chucks other than bolts. Needless to say, it is possible to grasp small articles such as:

As explained above, the present invention provides a pipe for supplying small articles, which has a plurality of gripping claws that open and close inwardly, which are opened and closed by the action of a plate spring, in the opening at the tip, and is arranged in a substantially bent shape at a position away from the tip. Along with bending it into a shape,
An insertion hole is formed in this bent portion that communicates linearly with the inner diameter surface of the tip opening, and a shutter that is always pressed in the closing direction is attached to the inner surface of the pipe in the insertion hole so as to be able to swing open and close. Small articles are supplied one by one from the starting end of the supply pipe by air blowing or the like, and a rod for pushing out small articles is inserted into the insertion hole so that it can move forward and backward, so that the tip of the small article supply pipe This eliminates the need for a mechanism to separate small articles, making the chuck smaller and lighter, making it advantageous for inserting and feeding small articles into narrow spaces, and completely separating the small article supply pipe and the guide tube of the push rod. Therefore, these can be manufactured easily and inexpensively, and the small article supply pipe is continuous from the start end to the end, just by bending, so there is no need to avoid widening the passage at the Y-shaped confluence or sudden changes. Since there are no direction changing parts, there is no inversion or instability of the posture caused by these parts, and there is no damage caused by collision with the passage wall.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a conventional chuck, and FIG. 2 is a side sectional view thereof. Fig. 3 is an explanatory cross-sectional view showing the chuck according to the present invention, Fig. 4 is an explanatory cross-sectional view showing its operating state, and Fig. 5 is an explanatory cross-sectional view showing the chuck according to the present invention.
6 is a sectional view taken along the line A-A in the figure, and FIG. 6 is a view taken along arrow B in FIG. 3. 23d... Supply path, 25a... Termination, 31...
Gripping claw, 36...Small article.

Claims (1)

[Scope of utility model registration request] A supply pipe for small articles, which has a plurality of gripping claws that open and close inwardly and are narrowed inward at the opening at the tip, is bent into a substantially doglegged shape at a position away from the tip, and this folding is performed. An insertion hole is provided in the curved portion that communicates linearly with the inner diameter surface of the tip opening, and a shutter that is always pressed in the closing direction is attached to the inner surface of the pipe in the insertion hole so as to be able to swing open and close.
Small articles are supplied one by one from the starting end of the supply pipe by air blowing or the like, and a rod for pushing out the small articles is inserted into the insertion hole so as to be movable forward and backward. Check.