JPH11320204A - Clamp device for bar feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device for a bar feeder with a simple structure in which no gear is used and the number of components is reduced. SOLUTION: This clamp device 16 is provided with a pair of slider crank mechanisms. A pair of claw pieces are connected to these sliders 22a, 22b so as to be opened and closed. Accordingly, the clamp device 16 has a simple structure without using a gear. By fitting the constitution member of a link mechanism to a slide rail 21, the slide rail 21 exercises also as a main body function, to reduce the number of component items and to miniaturize the clamp device 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar feeder for feeding a bar to a bar processing machine such as an automatic lathe, and more particularly to a bar introduced into the bar feeder by a pair of claws from above and below. The present invention relates to a clamping device for clamping.

[0002]

2. Description of the Related Art A bar feeder pushes a bar in the axial direction with a feed rod and feeds the bar to a main shaft of a lathe arranged in front. A finger chuck for gripping the rear end of the bar is rotatably provided at the tip of the feed rod. The bar is sent to the main spindle of the lathe while being held by the finger chuck. The bar material sent to the lathe is chucked by a collet chuck provided on the main shaft, is driven to rotate, and is cut by a cutting tool provided in front of the collet chuck.

[0003] On the upper surface of the bar feeder, a shelf for storing the bar is provided. Bars are introduced into the bar feeder one by one from the shelf. When the bar is introduced into the bar feeder, the clamping device having a pair of claws temporarily sandwiches the vicinity of the rear end of the bar up and down. Then, the feed rod is advanced, the rear end of the bar is inserted into the finger chuck, and chucking is performed. When the finger chuck chucks the bar, the bar is released from the restraint by the clamping device and sent to the lathe. By sandwiching the bar with the clamp device, centering of the bar and the finger chuck is performed.

Conventionally, as this type of clamping device, FIG.
The one using the gear shown in FIG. The clamp device 1 includes a main body 2 fixed to a frame 5 of a bar feeder, a pair of gears 3a, 3b rotatably mounted while being engaged with the main body 2, and a link connected to the gears 3a, 3b. 7c and 7d, links 7a and 7d rotatably connected to the main body 2, claw portions 4a rotatably connected to the links 7a and 7b, and links 7c and 7d.
And a rotation lever 8 connected to the lower gear, and a cylinder 6 for rotating the rotation lever 8. The links 7a, 7b, 7c, 7d are
All lengths are set equal. A pair of claws 4a, 4b
Are opened and closed by a pair of parallel crank mechanisms.

When the cylinder 6 is operated, the rotation lever 8
Rotates, and the gears 3a and 3b rotate. Gear 3
With the rotation of the links 7b and 7c fixed to a and 3b,
The pair of claws 4a and 4b are
Move up and down on line objects. For this reason, even if the diameter of the bar changes, the center line of the clamped bar can always be kept constant.

[0006]

However, since the conventional clamping device 1 has the gears 3a and 3b and a pair of parallel crank mechanisms, the number of parts is increased, and the clamping device 1 can be mounted with a simple mechanism. Cannot be configured. Further, when a bar made of a small-diameter hollow pipe having low rigidity is clamped, the bar may be crushed.

In view of the above, the present invention provides a clamp device having a simple mechanism with a reduced number of parts of the clamp device,
It is another object of the present invention to provide a clamp device that can prevent a bar from being crushed even when a small-diameter hollow pipe is grasped.

[0008]

Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

According to the first aspect of the present invention, the bar (14) introduced into the bar feeder (11) is provided with a pair of claw pieces (28a, 28).
b) Clamping device (1)
6) a slide rail (21) extending vertically, a crank lever (31) rotatably attached to the slide rail (21), and a linear guide to the slide rail (21); Crank lever (3
A pair of sliders (22a, 22b) disposed above and below the rotation center (P) of 1), and the pair of sliders are rotatably connected to both sides of the rotation center (P) of the crank lever (31). (22a, 22b) A pair of links (32a, 32b) rotatably connected to each other, and a driving source (5) for rotating the crank lever (31).
0), and the pair of claw pieces (28a, 28b) are respectively coupled to the pair of sliders (22a, 22b).

According to the present invention, the crank lever (31)
Is rotated, a pair of sliders (22a, 22b) forming a part of the slider crank mechanism open and close in the vertical direction. Therefore, the clamp device can be configured with a simple mechanism with a reduced number of parts without using gears. In addition, by attaching the components of the link mechanism to the slide rail (21) and using the slide rail (21) also as a main body, the number of components can be reduced and the clamp device (16) can be downsized.

[0011] The invention according to claim 2 is characterized in that the pair of links (3
2a, 32b) have the same length and are connected to the crank lever (31) at a position equidistant from the rotation center (P) of the crank lever (31).

According to the present invention, the pair of sliders (22
a, 22b) and a pair of claw pieces (28a, 28)
b) symmetrically moves up and down with respect to the rotation center (P) of the crank lever (31). Therefore, even when the diameter of the bar (14) changes, the center line P of the sandwiched bar (14) can always be kept constant.

According to a third aspect of the present invention, in the first or second aspect of the present invention, at least one of the pair of sliders (22a, 22b) is provided with a stopper (40) for regulating a moving amount.
Is provided.

According to the present invention, the claw pieces (28a, 28)
The amount by which b) sandwiches the bar (14) is regulated. Therefore, even when the bar (14) is a small-diameter pipe, the bar (14) can be sandwiched between the pair of claw pieces (28a, 28b) without being crushed.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the driving source (50) is attached to the slide rail (21).

According to the present invention, the drive source (50) is operated, and the slide rail (21) is moved up and down while the bar (14) is sandwiched between the claws (28a, 28b). The center line of the material (14) can be aligned with the center line of the finger chuck. Accordingly, the clamp device (16) can be accurately positioned while observing the positional relationship with the finger chuck while the bar (14) is actually clamped.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a bar feeder 11 includes a guide pipe 12 for guiding a bar and a feed rod in a longitudinal direction. A clamp device 16 is provided in a part of the guide pipe 12 which is partially removed.

As shown in FIG. 2, a feed rod 13 for pushing a bar in the axial direction is provided in the guide pipe 12. The feed rod 13 is connected to a reciprocating timing belt 15, and reciprocates between a bar supply unit and a lathe. A finger chuck is rotatably attached to the tip of the feed rod 13 via a bearing or the like. The finger chuck grips the bar by its elastic expansion and deformation.

The bars 14 are introduced one by one from a shelf 17 provided above the bar feeder 11 into a guide pipe 12 provided inside the bar feeder 11, and a rear end of the bar 14 is clamped. It is temporarily sandwiched by the device 16. The rear end of the bar 14 is positioned in the horizontal direction by a V-shaped guide in cross section, and is positioned in the vertical direction by the clamp device 16. After positioning the bar 14 and centering the bar 14 and the finger chuck, the feed rod 13 is advanced to insert the rear end of the bar 14 into the finger chuck. When the finger chuck chucks the bar 14, the bar 14 is released from the restraint by the clamping device 16 and sent to the automatic lathe.

FIGS. 3 and 4 show an embodiment of the clamping device of the bar feeder according to the present invention. The clamp device 16 includes a slide rail 21 fixed to the frame 18 and extending vertically, a crank lever 31 rotatably attached to the slide rail 21, and a linear guide guided by the slide rail 21, with respect to the rotation center P of the crank lever. An upper slider 22a disposed above and a lower slider 22 linearly guided by the slide rail 21 and disposed below the rotation center P of the crank lever 31;
b and a pair of links 32 rotatably connected to both sides of the rotation center P of the crank lever 31 and rotatably connected to the upper slider 22a or the lower slider 22b.
a, 32b and a drive source 50 for rotating the crank lever 31. The pair of claw pieces 28a and 28b are connected to the upper slider 22a or the lower slider 22b. Further, a stopper 40 is provided on the lower slider 22b.

The slide rail 21 is connected to the guide pipe 12
And the movable guide pipe 12a, and extends in the up-down direction. The lower part of the slide rail 21 is
To each other via a connecting plate 23. Slide rail 21
The mounting position of is that the rotation center P of the crank lever 31 is
Height adjustment is performed so as to coincide with the center line 25 of the finger chuck.

Upper slider 22a and lower slider 22
b is a block having a rectangular parallelepiped shape,
Slide up and down along 1. The upper slider 22a and the lower slider 22b are
Make a sliding even number.

The crank lever 31 is mounted on the slide rail 21.
Is rotatably attached to a support shaft 33 fixed to the support shaft 33.
The crank lever 31 and the slide rail 21 form a turning pair. A lower link operating shaft 35a is fixed to one end of the crank lever 31. The upper link operating shaft 35b is fixed to the opposite side of the rotation center P of the crank lever 31. The distance between the lower link operation shaft 35a and the rotation center P and the distance between the upper link operation shaft 35b and the rotation center P are set to be equal. At the other end of the crank lever 31,
A pin 54 connected to the drive source 50 is provided.

One end of the upper link 32a is rotatably connected to an upper link operating shaft 35b. The other end of the upper link 32a is rotatably connected to the upper slider 22a. As shown in FIG. 4, the upper link 32a is connected to the upper slider 22a via a bush 36a and an upper slider fixing bolt 34a inserted into the bush 36a.
Is rotatably connected to The upper link 32a makes a turning pair with the upper slider 22a and the crank lever 31.

One end of the lower link 32b is also rotatably connected to the lower link operating shaft 35a. As shown in FIG. 4, the other end of the lower link 32b is also rotatably connected to the lower slider 22b via a bush 36b and a lower slider fixing bolt 34b inserted into the bush 36b. The lower link 32b also makes a pair with the lower slider 22b and the crank lever 31.

As described above, the clamp device 16 includes a pair of slider crank mechanisms including the upper slider 22a, the lower slider 22b, the pair of links 32a, 32b, and the crank lever 31 with respect to the rotation center P of the crank lever 31. This means that they are provided point-symmetrically.

As the driving source 50, a cylinder 52 is used. The cylinder 52 is rotatably mounted on a cylinder mounting plate 51 whose rear end is fixed to the slide rail 21 via a cylinder pin 55. One end of a rod 53 of the cylinder 52 is rotatably attached to the crank lever 31 via a pin 54 and a knuckle.

The stopper 40 includes a stopper bolt 42,
The stopper bolt 42 is in contact with the contact piece 43.
The stopper bolt 42 is erected with its head up. The lower portion of the stopper bolt 42 is threaded, and is screwed with the bolt mounting plate 41 fixed to the slide rail 21. By rotating the stopper bolt 42 in the bolt mounting plate 41, the head of the stopper bolt 42 moves up and down. The contact piece 43 is fixed to the lower slider 22b. The contact piece 43 has a hole having a diameter slightly larger than the shaft diameter of the stopper bolt 42, and the shaft of the stopper bolt 42 is inserted into this hole. Lower slider 22b
Is moved upward by a certain amount, the contact piece 43 collides with the lower surface of the head of the stopper bolt 42, and the movement of the lower slider 22b is restricted. The stopper 40 may be provided on the upper slider 22a side, or may be provided on both the upper slider 22a side and the lower slider 22b side. Also,
The contact piece 43 may be fixed to the claw portions 28a, 28b.

Next, the operation of the clamp device having the above configuration will be described. Activate the drive source 50 and move the rod 5
When 3 is expanded and contracted, the crank lever 31 rotates around the rotation center P. With the rotation of the crank lever 31, the upper slider 22a and the lower slider 22b make linear movements along the slide rail 21 in the vertical direction opposite to each other. Upper slider 22a and lower slider 22b
Is connected to the pair of claw pieces 28a and 28b, the bar member 14 can be vertically sandwiched between the pair of claw pieces 28a and 28b.

As described above, according to the clamp device 16 of the present invention, the clamp device 1 that sandwiches the bar 14 with a simple link mechanism with a reduced number of parts without using gears.
6 can be configured. Also, the components of the link mechanism are attached to the slide rail 21 and the slide rail 2
By having the function of the main body also function as 1, the size of the clamp device 16 can be reduced without providing a separate main body. Further, the upper slider 22a and the lower slider 22
b, a pair of slider crank mechanisms having a rotation center P
The upper slider 2
2a and the lower slider 22b move symmetrically with respect to the rotation center P. Therefore, even when the diameter of the bar 14 changes, the center line of the sandwiched bar 14 can always be kept constant.

As shown in FIG. 4, the bar 1
When 4 is introduced, the movable guide pipe 12a moves away from the center line 25 of the finger chuck. The V-shaped guide 26 that has been replaced and separated appears near the center line 25 of the finger chuck. FIG. 4 shows a state in which the V-shaped guide 26 is separated. And the rod member 14 is composed of the guide pipe 12 and the V-shaped guide 2.
It is dropped in 6. At this time, a pair of claw pieces 28a,
28b is opened so as not to hinder the introduction of the rod material 14;
Move to the position indicated by the chain line. The bar 14 is moved to the vicinity of the clamp device 16 by a bar moving device (not shown) with the vicinity of the rear end guided by the V-shaped guide 26.
The rear end of the bar 14 is guided by the V-shaped guide 26 to be positioned in the horizontal direction. After that, the clamp device 16 is operated, and the pair of claw pieces 28a and 28b
4 sandwich the rear end vertically. Since the rotation center P of the crank lever 31 coincides with the center line 25 of the finger chuck, the center line of the bar 14 always coincides with the center line 25 of the finger chuck in the vertical direction. Therefore, the vertical position is determined by sandwiching the bar 14 with the clamp device 16. Further, the bar 14 is positioned in the horizontal direction by being guided by the V-shaped guide 26. Thus, the bar 14 is positioned vertically and horizontally,
Centering with the finger chuck is performed. Then V
The character guide 26 and the movable guide pipe 12a are switched again, the feed rod 13 guided by the movable guide pipe 12a is advanced, and the rear end of the bar 14 is chucked by the finger chuck provided at the front end of the feed rod 13.

As described above, by providing the stopper 40, the amount by which the pair of claw pieces 28a and 28b sandwich the bar 14 is restricted. Therefore, even when the rod 14 is a small-diameter pipe, the rod 14 can be sandwiched between the pair of claw pieces 28a and 28b without being crushed. Also, the stopper 40
Is provided near the pair of claw pieces 28a and 28b,
It is possible to eliminate the influence of the backlash of the mechanism and to accurately regulate the amount of sandwiching the bar 14.

The drive source 50 is connected to the slide rail 21.
, The drive source 50 is activated, and the claw pieces 28
The slide rail 21 is moved up and down while the bar 14 is sandwiched between a and 28b, so that the clamp device 16 that aligns the center line of the bar 14 with the center line of the finger chuck can be positioned. Therefore, it is possible to accurately position the clamp device 16 while observing the positional relationship with the finger chuck while the bar 14 is actually clamped.

[0034]

As described above, according to the clamp apparatus of the bar feeder of the present invention, the clamp apparatus is constituted by a slider crank mechanism combined with a point symmetrical with respect to the rotation center of the crank. Since the claw pieces are opened and closed up and down, the clamp device can be configured with a simple mechanism without using gears. In addition, by attaching the component members of the link mechanism to the slide rail and using the slide rail also for the function of the main body, the number of components can be reduced and the size of the apparatus can be reduced. Furthermore, by providing a stopper that regulates the amount of movement of the slider, the amount of pinching of the claw is regulated,
Even if a small-diameter hollow pipe is grasped, the bar can be prevented from being crushed.

[Brief description of the drawings]

FIG. 1 is a front view showing a bar feeder.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a front view showing a clamping device of the bar feeder of the present invention.

FIG. 4 is a side view showing a clamping device of the bar feeder of the present invention.

FIG. 5 is a front view showing a clamping device of a conventional bar feeder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Bar feeder 14 Bar 16 Clamping device 21 Slide rail 22a Upper slider 22b Lower slider 28a, 28b Claw piece 31 Crank lever 32a, 32b Link 40 Stopper 50 Drive source P Rotation center

Claims (4)

[Claims] 1. A clamping device for a bar feeder for vertically sandwiching a bar introduced into a bar feeder with a pair of claws, comprising: a slide rail extending in a vertical direction; A crank lever that is rotatably mounted on the
A pair of sliders that are linearly guided by the slide rails and are disposed above and below the rotation center of the crank lever, and rotatably connected to both sides of the rotation center of the crank lever and rotatably connected to the pair of sliders, respectively; A pair of links and a drive source for rotating the crank lever, and the pair of claws are coupled to the pair of sliders, respectively. 2. A pair of links having the same length and being connected to the crank lever at a position equidistant from the rotation center of the crank lever.
A clamping device for a bar feeder according to the above. 3. The clamping device for a bar feeder according to claim 1, wherein at least one of said pair of sliders is provided with a stopper for restricting a movement amount. 4. The clamping device for a bar feeder according to claim 1, wherein the drive source is attached to the slide rail.