JP3023364B1 - Double arm type automatic tool changer - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To speed up the time of automatic tool change and to prevent a clamp bar for chucking a tool from moving forward and backward accurately due to frictional resistance and machining vibration generated at the time of forward / backward movement, resulting in an uncertain lock and a risk of accidentally dropping the tool. is there. SOLUTION: A pin lock 4 in which a vertical groove 7 and a through hole 8 are communicated with the outer peripheral surface of a pin holder 4 into which a double arm central shaft 5 is inserted, and a slope 9a which presses against a slope 4b of a base end surface of a clamp bar 4 is provided. 9 is loosely fitted in the communication hole, and the device pin 12 is loosely fitted in the through hole 11a of the bracket 11 erected at the center of the double arm 1, and the protruding end of the device pin raised at the time of clamping comes into contact with the device push-down plate. A mechanism lock pin push-up plate 14 is provided at an appropriate position where the mechanism 13 and the projecting end of the mechanism lock pin that has fallen during unclamping abut against each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-arm automatic tool changer.

[0002]

2. Description of the Related Art A double-arm type automatic tool changer is configured such that a tool mounted on a spindle of a machine tool and a tool housed in a tool magazine are pressed by a spring of a pressing spring at a tip of a clamp bar mounted on a double arm. The tool is pressed against the tool, clamped, and automatically replaced alternately.

[0003]

Recently, the speed of tool change has been accelerated, and one cycle of automatic tool change has been performed in only 1.5 to 2.0 seconds. The clamp bar may not operate normally due to the action of the pressing spring due to the frictional resistance and the processing vibration that occurs, which may cause the tool to be incorrectly clamped on the spindle or tool pot, and may cause the tool to fall accidentally during work. Was. As a countermeasure, a measure of increasing the resilience of the pressing spring has been taken.

[0004]

SUMMARY OF THE INVENTION In an automatic tool changer equipped with a clamp bar mounted on a double arm and chucking the tool alternately by pressing the tool against a spindle and a tool pot at the tip, the center axis of the double arm is rotated. A vertical groove is provided on the outer peripheral surface of the pin holder to be freely inserted and a through hole communicating with the vertical groove is formed, and a pressing piece having a slope formed at the tip, a vertical groove and a through hole of the pin holder. In addition to forming a device lock pin by connecting a shaft rod that loosely fits into a T-shape, a slope against which the slope of the pressing piece is pressed against the clamp at the time of clamping is formed on the base end face of the clamp bar, and a cylinder is formed at the center of the double arm. An upright bracket is erected, and a through hole is formed in the axial direction to allow the device pin to freely fit in and out, and the lower end surface of the device pin is brought into contact with the upper end surface of the device lock pin to protrude from the bracket. Device The mechanism lock pin push-down plate, which has a blind hole through which the shaft of the mechanism lock pin protruded from the through hole of the pin holder is fitted and detachably abutted. It is an object of the present invention to mount a tool in a proper position of a tool changer, accurately advance and retreat a clamp bar at the time of tool change, securely lock the tool with the clamp bar, and prevent a risk of the tool being inadvertently dropped.

[0005]

1 is a longitudinal sectional front view showing a device of the present invention, FIG. 2 is an enlarged view of a main part of the device, FIG. 3 is a plan view showing the device of the present invention, and FIG. 4 is a part of the device of the present invention. FIG. 2 is a perspective view showing a state in which a certain pin holder, a holding plate, and a device lock pin are separated; a tool (not shown) mounted on a double arm 1 and a tool pot 2; In an automatic tool changer equipped with a clamp bar 4 which presses and chucks alternately, an upper part of a pin holder 6 for rotatably inserting a center shaft 5 of a double arm is formed in a reduced diameter portion 6a, and a reduced diameter portion 6a is formed. A longitudinal groove 7 is provided on the outer peripheral surface of the enlarged diameter portion 6b connected to 6a so as to face backward, a flange edge 6c is protruded near the center of the enlarged diameter portion 6b, and a flange edge 6c is provided.
A through hole 8 is formed in the enlarged diameter portion 6b below the flange 6c to form a vertical groove 7
To communicate with FIG. 5 is a perspective view showing the device lock pin, in which the base end of a pressing piece 9b having a tip end surface formed on a slope 9a is integrally formed in a T-shape with a shaft rod 9c loosely fitted in the vertical groove 7 and the through hole 8. And the device lock pin 9 is formed.

As shown in a cutaway perspective view of a main portion of a base end portion of the clamp bar shown in FIG. 6, the base end surface of the clamp bar 4 is inclined 4b.
And the lock pin 9 when the tool 3 is clamped.
Is pressed into contact with the inclined surface 9a, and the recess 4c is retracted so that the pressing piece 9b of the device lock pin 9 detached from the inclined surface 4b of the clamp bar 4 during unclamping does not interfere.
Is provided by notching the base end surface of the clamp bar 4. A donut-shaped holding plate 10 is attached to the reduced diameter portion 6a of the pin holder 6.
And a through hole 10a is drilled in the holding plate 10 to communicate with the vertical groove 7 and the through hole 8 of the pin holder 6, and the shaft 9c of the lock pin 9 is loosely fitted into the communicating hole to press the pressing piece. 9b
From the vertical groove 7.

A bracket 11 consisting of a rectangular cylindrical body with a lid is fixed to the upper surface of the central part of the double arm 1, a through hole 11a is formed in the cylindrical body in the axial direction, and a device pin 12 is loosely fitted so as to be able to protrude and retract. The lower end of the pin 12 is brought into contact with the upper end surface of the device lock pin 9 and the upper
1a, and the projecting pin is forcibly pressed down by pressing the projecting pin 12 to the lower surface of the tacking pin push-down plate 13 attached to an appropriate position of the tool changer main body, thereby forcibly pushing down the tacking pin 12. Is removably fitted into a through-hole 13a provided in the mechanism pin push-down plate 13. 1 and 2, the base end of the double arm 1 is fixed to the bracket 11, the center axis 5 of the double arm is fixed to the upper surface of the bracket 11, and the shaft 9c of the device lock pin 9 is turned as shown in FIG. A mechanism lock pin push-up plate 14 having a blind hole 14a movably fitted therein and a through hole 14b for loosely fitting the lower end of the double arm central shaft 5 is mounted in a proper position of the tool changer body. Therefore, as shown in FIGS. 8 and 9, the pin holder 6 for loosely fitting the double arm center shaft 5 is fixed at the time of unclamping, and at the time of clamping, the slope 4b of the clamp bar 4 is pressed against the slope 9a of the device lock pin 9. To swing together with the double arm 1. A pressing spring 15 urges the device pin 12 to slide downward.
Reference numeral 5 does not need to be particularly provided, and reference numeral 16 denotes a guide pin for restricting accurate movement of the clamp bar 4. Although the double arm of the apparatus of the present invention is shown as a horizontal type, it can be applied to a vertical type double arm. The device of the present invention operates as follows. When the double arm 1 rises and the projecting end of the device pin 12 abuts against the device push-down plate 13, the device pin 12 is forcibly pushed down, and the lower end thereof is urged by the urging force of the pressing spring 15, and the device lock pin 9. Shaft 9
c, the slope 9a formed on the pressing piece 9b of the device lock pin 9 is pressed against the slope 4b formed on the base end face of the clamp bar 4, and the clamp bar 4 advances.
The tip surface 4a is pressed against the tool 3 and chucks.
At the time of clamping, the pin holder 6 rotates together with the double arm 1. In this clamped state, the double arm 1 descends and the tool 3 is pulled out from the spindle and the tool pot 2 (shown in the right half of FIG. 1 and FIG. 9a). After the tool 3 is pulled out, the double arm 1 rotates by 180 degrees and then descends, and the shaft 9c of the device lock pin 9
When the lower end of the device abuts against the bottom surface of the blind hole 14a of the device lock pin push-up plate 14, the device lock pin 9 rises together with the device pin 12 against the elastic force of the pressing spring 15,
The pressure contact between the inclined surface 9a of the pressing piece 9b and the inclined surface 4b of the clamp bar 4 is released, the clamp bar 4 is in an unclamped state (shown in the left half of FIG. 1 and FIG. 9b), and the exchanged tool 3 is mounted on the spindle. it can. The fixed position of the device lock pin 9 is at the time of unclamping shown by a solid line in FIG. 8. The pin 9 is fixed.

[0008]

The slope 9a formed on the pressing piece 9b of the device lock pin 9 during clamping is the slope 4b of the clamp bar 4.
The clamp bar 4 is smoothly and strongly pressed against
The tool 3 advances accurately, securely chucks the tool 3 at its tip end surface, locks completely, and never drops the tool 3 at the time of automatic tool change, which is extremely safe. Further, the device pin 12 is forcibly pressed by the device pin push-down plate 13, and the lower end thereof is pressed against the upper surface of the device lock pin 9, so that the clamp bar 4 is double-locked, which is more secure.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a device of the present invention.

FIG. 2 is an enlarged view showing a main part of the device of the present invention.

FIG. 3 is a plan view showing the device of the present invention.

FIG. 4 is a perspective view showing a state where a device lock pin, a holding plate, and a pin holder according to the present invention are separated.

FIG. 5 is a perspective view showing a device lock pin according to the device of the present invention.

FIG. 6 is a cutaway perspective view of a main part showing a base end of a clamp bar according to the device of the present invention. FIG. 5 is a plan view showing a state in which a device lock pin loosely fitted to a pin holder and a clamp bar provided on a double arm are disengaged.

FIG. 7 is a perspective view showing a mechanism lock pin push-up plate according to the apparatus of the present invention.

FIG. 8 is a plan view showing a state in which a device lock pin loosely fitted to a pin holder and a clamp bar provided on a double arm are disengaged.

FIG. 9A is an explanatory view showing a press-contact state between the pressing piece of the device lock pin and the base end face of the clamp bar during clamping.
b Explanatory drawing showing a state in which the pressing piece of the device lock pin is detached from the base end surface of the clamp bar at the time of unclamping.

[Explanation of symbols]

1 double arm 2 tool pot 3 tool 4
Clamp bar 4a Clamp bar tip surface 4b Slope of clamp bar 5 Double arm center axis 6 Pin holder 6a Pin holder reduced diameter part 6b
Pin holder enlarged diameter part 7 Vertical groove 8 10a 11a 13a 14b Through hole 9 Device lock pin 9a Slope of device lock pin 9b Pressing piece 9c Shaft 10 Holding plate 11 Bracket 12 Device pin 13 Device pin push-down plate 14 Device lock pin push-up plate 14a blind hole

Claims (1)

(57) [Claims] 1. An automatic tool changer equipped with a clamp bar mounted on a double arm and pressing a tool by a tip against a spindle and a tool pot alternately to chuck the tool.
A pressing piece having a vertical groove provided on the outer peripheral surface of the pin holder for rotatably inserting the center axis of the double arm and a through hole communicating with the vertical groove, and a tip formed on a slope, A pin lock is formed by connecting a shaft rod loosely fitted in the vertical groove and the through hole of the pin holder in a T-shape, and a slope on which the slope of the pressing piece is pressed against the clamp bar at the time of clamping is formed on the base end face of the clamp bar. , A cylindrical bracket is erected in the center of the double arm, and a through hole is drilled in the axial direction so that the device pin can be freely inserted and removed, and the lower end surface of the device pin is attached to the upper end surface of the device lock pin. A mechanism pin push-down plate that is brought into contact, and a mechanism pin protruding from the bracket is pressed and pressed so that it can come and go freely, and a blind hole in which the shaft rod of the mechanism lock pin that protrudes from the through hole of the pin holder comes into and out of contact. Device with lock Double arm type automatic tool changer comprising attached in place of the push-up plate tool changer.