JPS61288953A - Detector for feed amount of tool on machining head - Google Patents

Abstract

PURPOSE:To aim at enhancing the accuracy of detection of the feed amount of a machining device such as, for example, a drilling machine or a thread cutting machine, by providing a plurality of limit switches which are controlled by a movable block moving in parallel together with a spindle, and by a dog. CONSTITUTION:When a drive mechanism is operated to rotate a spindle 42, the latter advances while rotating due to the relationship between male and female threads 44, 39 to feed a tool for fabricating a workpiece. Further, a movable block 52 also moves together with the spindle 42, and turns on a front section limit switch 66 when the fabrication is completed. Thereby, the drive mechanism is stopped to cease the rotation of the spindle 42. After a predetermined time elapses, a spindle 42 is reversed to retract the tool. Further, a dog 58 turns on a rear limit switch at a predetermined position to stop the rotation of the spindle 42. This device has a simple structure and a high responsiveness, and therefore, the accuracy of detection may be made to be high.

Description

[Detailed description of the invention] Main occupation: Satoshi Kamitate ■ This invention relates to a detection device that is installed in the machining head of a processing device that performs machining and thread cutting, and that automatically detects the amount of feed of a tool. be.

In processing equipment that uses multiple drills to drill holes or threads using multiple taps, a processing head equipped with a large number of tools is usually attached to a power unit, and the power unit feeds the processing head. We give them and process them.

As another method, especially for tapping devices that require precision feed, there is one in which the machining head is moved to a predetermined position by a power unit, and then the machining head is fixed and the machining is performed by feeding the tool. As shown in Figures 4 and 5, a gear transmission mechanism (2) consisting of a plurality of gear trains is provided in the processing head (1), and the first gear (3) of the gear transmission mechanism (2) is connected to the processing head ( 1) The drive motor (
5) to the output shaft (6) via a gear (7), and the final row gear (4) to the rotating shaft (8) provided on the processing head (1) via a gear (9). The rotation axis (
Attach the spindle (10) to the spindle (10) using the slide key (1)) so that it cannot rotate but can slide in the axial direction.
10) through the lead bush (12) provided on the processing head (1), and the male thread (13) carved on the spindle (10) into the female thread (14) formed on the lead bush (12). Screw them together, and then attach the spindle (1
Attach the tap holder (15) to the tap holder (
Attach the tap (16) to 15).

The above device uses a power unit to move the processing head (1) to a predetermined position, and then rotates the drive motor (5) in the forward direction to rotate the rotating shaft (8) via the gear transmission mechanism (2). The spindle (10) is rotated, and the spindle (10) is advanced by the threaded relationship between the spindle (10) and the lead bush (12).
), the tap holder (15) and the tap (16) are rotated and moved forward together to perform processing. When the machining is completed to a predetermined depth, the drive motor (5) is temporarily stopped and then reversely rotated to reverse the tap (16) while moving it backward.

By the way, in the above-mentioned processing device, the feed amount of the tap (16) is automatically detected and the drive motor (5) is automatically stopped when machining a predetermined dimension, and also when the tap (16) is retracted, it is retracted by a predetermined dimension. Then, it is necessary to automatically stop the drive motor (5) and tap (16) to the processing head (1).
) is provided with a detection device for detecting the feed amount.

The conventional detection device, for example, has two power take-off shafts (17) and (18) rotatably provided in the processing head (1).
A gear (1) integrally connected to both (17) and (18)
9) (20) and mesh one gear (19).
) is meshed with the gear (9) provided on the rotating shaft (8),
The end of the other take-out shaft (18) is made to protrude from the processing head (1), and this protruding end (18a) is attached to the processing head (1).
The feed screw (21) is connected to the end of the feed screw (2 pieces) rotatably attached to the side surface of the feed screw (21) via the power transmission teeth (22) (23) and the intermediate gear (24). dog (25) (26) (27) (28
), and part of the dogs (25) to (28) is locked to a guide bar (29) arranged parallel to the feed screw (21), and each dog (25) to (28) is moved. A limit switch (LSI) (LSz) (L
Sa) is provided.

When the rotation shaft (8) rotates, the detection device detects the rotation of the rotary shaft (8) through the gears (19) (20), the take-out shaft (18), the power transmission gears (22) (23), and the intermediate gear (24) through the feed screw. (21), which causes each dog (
25) to (28) along the feed screw (21), and by kicking the specified limit switches (LSI) (LSz) (LSa) with the dogs (25) to (28), the tap (16) is activated. Detect the feed amount. In addition, the above-mentioned detection device detects the feed of the tap (16) and the dog (25).
(2 days) is set so that it is proportional to the shipping time.

■<n"rut4 The conventional detection device uses a large number of gears to extract the rotation of the rotary shaft (8) that feeds the tap (16), thereby rotating the feed screw (21). Therefore, there were problems such as a large number of parts, a complicated structure, poor responsiveness, and low detection accuracy.Also, limit switches (LSI) (LSz) (LSa), feed screws (21), and dogs (25 ) to (28) etc. are provided outside the side of the processing head (1), so the limit switches (LSi) (LSz) (LSa) may be pressed for some reason and malfunction, or the feed screw (21) may There was a problem in that the lubricating oil supplied for lubrication with the dogs (25) to (28) fell and contaminated the surrounding area.

In this invention, a spindle on which a tool is attached is configured to be rotatable and slidable, and is installed in parallel with the spindle within a processing head configured to operate the spindle by an appropriate drive means. a guide rod, a moving block that is slidably attached to the guide rod and has a portion thereof locked to the spindle, a dog that is fixedly installed on the moving block, and a dog that is provided at the end of the moving stroke of the moving block, O at dog
It consists of a plurality of limit switches that are N-OFF controlled, and all parts are assembled into the processing head.

In this invention, a moving block is moved together with a spindle along a guide rod, and a dog provided on the moving block is used to turn on a corresponding limit switch.

Figures 1 to 3 are drawings showing an embodiment of the present invention. In the figures, (30) is a processing head formed in a rectangular box shape, with its front and rear walls (31) and (32). ) have a plurality of through holes (33) (33)..., (34) (34
)... are arranged equidistantly around a certain point, and
They are formed on the same axis so as to face each other at the front and rear, and mounting holes (35) and (36) are formed above the middle part. (37
) (37) ... is the front wall (
Through hole (33) (33)... formed in 31)
This is a lead bush attached to the cylindrical part (37a) and a flange part (37b), and the inner peripheral surface of the cylindrical part (37a) has an oil groove 38) for supplying lubricating oil along the axial direction. In addition, a female thread (39) is carved in the rear part, and the flange part (37b) is formed in a substantially fan shape.

This lead bush (37) is connected to each through hole (3) from the front side.
3) (33)...Insert it into the flange part (37
b) are arranged so that adjacent ones do not interfere with each other, are brought into contact with the front wall (31), and are fixed in a non-rotatable state. (40) is the rear wall (32) of the processing head (30)
This is a bushing that is press-fitted and fixed into the through hole (34) (34)... formed in the bushing (40) and the rear wall (3).
2) and tighten the set screw (41) across the two to prevent movement in the axial direction and circumferential direction.

(42) is a spindle that is supported through the processing head (30), and has a large diameter cylindrical nose (43) integrally formed at the tip for attaching a tool holder (not shown), and a lead bushing in the middle. Female thread (39) formed in (37)
) is carved with a male screw (44) to be screwed together with the male screw (44).
4) Form a small diameter part (45) with an appropriate size slightly rearward,
Key I on the rear end! (46) and an annular groove (47). This spindle (4
2) connects the rear end from the front end side of the processing head (30) to the front wall (3).
1), and then slidably penetrates the bush (40) provided on the rear wall (32) to form the rear end joint (48). protrudes from the processing head (30) and has a male screw (44).
) formed on the lead bush (37).
) are screwed together. A tool holder is attached to the nose portion (43) at the tip, and a universal jig (not shown) rotated by a drive mechanism is coupled to the rear end coupling portion (48).

(49) is a spindle (42) inside the processing head (30).
A guide rod is installed parallel to the guide rod, and a key groove (50) is formed on the outer circumferential surface of the tip so as to be orthogonal to the axial direction. press fit into the mounting holes (35) and (36), and partially fit the key plate (51) into the key groove (50),
The key plate (51) is brought into contact with and coupled to the front wall (31) of the processing head (30), thereby fixing the guide rod (49) so that it cannot rotate and cannot move in the axial direction. be.

(52) is a moving block attached to the guide rod (49), which has a slide hole (53) with a slightly larger diameter than the guide rod (49) in the center along the elongated direction, and two holes on the top surface.
A book slide groove (54) (54) is formed in parallel along the horizontal direction, and a locking arm (55) is integrally formed in the orthogonal direction on the lower surface of the rear end. ) is formed with an arcuate groove (56) having approximately the same diameter as the small diameter shaft portion (45) of the spindle (42). This moving block (5
2) Push into the slide hole (53), -L (57)
(57) is press-fitted and fixed, and the bushing (57) (
57) is slidably fitted to the guide rod (49) to support it in a slidable manner, and the locking arm (
The circular-arc groove (56) formed in the spindle (4)
The spindle (42) is fitted onto the small-diameter shaft portion (45) formed in 2) to allow rotation of the spindle (42) while moving integrally in the axial direction.

(5B) (59) is a pair of dogs mounted on the moving block (52), and is a flat plate (58a) (59a)
A sliding protrusion (60) (
61), and an L-shaped protrusion (62) on the inside of the upper surface.
(63) are formed symmetrically, and both protrusions (62) (63) are formed symmetrically.
), the opposite vertical surfaces (62a) and (63a) are formed in a tabular shape. This dog (58) (59) is placed on the moving block (52) by inserting each slide protrusion (60) (61) into a row of slide grooves (54) formed in the moving block (52). and the flat plate part (58a) (59a
(63) (64) Hebor l-(
65) Insert (65), position it in the longitudinal direction, and fix it with the rear hoof. Also, the dog (58) (5
9) has the same structure, and 58'H59') are attached adjacently in the assembly width direction.

(66) and (67) are a pair of limit switches provided on the sides of the moving stroke end of the moving block (52), which actuate the switch bodies (66a) and (67a) on the top plate (68) of the knee rad (30). ) and fix the switch levers (66b) (67b) on the dog (58) (59
) are arranged on the locus of movement of the protrusions (62) and (63), and the limit switch (66) is connected to the dog (5).
8), the rotation of the spindle (42) is stopped and the feed is stopped, and after a certain period of time the spindle (42) is turned on.
42) is reversely rotated and the rear limit switch (67) is turned on by the dog (59), the reverse rotation of the spindle (42) is stopped and the backward movement is stopped. Also, a dog (5B') (5
9') respectively corresponding limit switches (6').
6°) (67') is provided. In addition, one dog (
58) (5B') is the limit switch (66) (6
6°) at the same time, the other dog (59) (59”)
Turn limit switches (67) (67') to O at the same time.
Do N.

(69) is a cover that closes the upper end opening of the processing head (30), and includes limit switches (66) (66") (67) (67°) and a dog (58) provided on the top plate (68). ) (58") (59) (59')
etc. are covered.

The machining head (30) equipped with the above-mentioned detection device is mounted on a power unit (not shown) together with a drive mechanism, and during machining, the machining head (30) is
is sent to a predetermined position, the drive mechanism is operated at that position,
Rotate the spindle (42) via the universal joint.

When the spindle (42) rotates, the spindle (42)
Male thread (44) and lead bush (37) formed on
), the spindle (42) rotates and moves forward due to the threaded relationship with the female thread (39) formed in the spindle (42).
) to machine the workpiece by feeding the tool held at .

As the spindle (42) moves forward, the moving block (
52) moves forward together to a predetermined position, and when processing is completed, the dog (52) provided on the moving block (52) moves forward.
58) Switch lever (6) of the front limit switch (66) (66") at the vertical surface (62a) (62a') of the protrusion (b2) (62') of (58")
8b) Kick (66h') and turn it ON. When the front limit switch (66) <66') is turned on, the drive mechanism is stopped and the rotation of the spindle (42) is stopped, and after a certain period of time has elapsed, the drive mechanism is restarted to rotate the spindle (42). Rotate in the opposite direction and spindle (42)
and retract the tool. When the spindle (42) retreats to a predetermined position, the rear dog (59) (59°) supported by the moving block (52) that moves together with the spindle (42) moves its protrusion (63) (63') vertical surface ( 63a)
(63a”) at the rear limit switch (67) (
67°) switch lever (67b) (67b'
) to turn it on. Rear limit switch (
67) When (67') is turned ON, the drive mechanism is stopped, the rotation of the spindle (42) is stopped, and the machining operation is completed. Thereafter, the workpiece is replaced, the drive mechanism is operated, and the above operation is repeated to perform machining.

Since this invention directly transmits the axial movement of the spindle on which the tool is attached to the moving block and moves it, the detection dog has good responsiveness to the movement of the spindle. Significantly improved. Furthermore, the number of parts is reduced and the structure is simplified. Furthermore, since the detection device is built into the machining head, there is no possibility of a malfunction caused by an operator accidentally pressing a limit switch, and the surrounding area will not be contaminated by lubricating oil or the like.

[Brief explanation of drawings]

Fig. 1 is a developed view of a processing head equipped with a detection device according to the present invention, Fig. 2 is a longitudinal cross-sectional side view of the processing head, Fig. 3 is a partially cross-sectional plan view of the processing head, and Fig. 4 is a conventional detection device. FIG. 5 is a developed view of a processing head equipped with a device, and FIG. 5 is a cross-sectional plan view of a conventional processing head. (30) - Processing head, (37) - Lead bushing, (39) ~ Male screw, (40) - Bushing, (42
)-, spindle, (44) - male thread, (49) -
Guide rod, (52) - Moving block, (5B)
(59) (58”) (59') ・-Dog, (6
6) (67) (66') (67°) - Limit switch.

Claims (1)

[Claims] (1) A guide rod installed parallel to the spindle in a machining head that is rotatably and slidably provided with a spindle on which a tool is attached; A locked moving block, a dog fixed on the moving block, and a dog provided at the end of the moving stroke of the moving block, and the dog is turned on and off.
A tool feed rate detection device for a machining head comprising a plurality of limit switches controlled by FF.