SU68304A1 - Device for the automatic installation of the cutter in the working position on machines with a copying thread-cutting device - Google Patents

Description

Machines for threading by means of a threaded copier rotated from a spindle are known. At the time of the supply of the cutter to the product, the copier interlocks with the semi-nut, which also informs the caliper and the cutter about the movement along the product. Usually, for this purpose, the semi-nut and the caliper are fixed on a rod that is rotatable and movable along the product. A system consisting of a supor with a cutter, half nuts and a stem rests on a ruler that acts as a fist. The latter ensures the rotation of the entire specified system.

According to the invention, it is proposed to bring the cutter to the product and retract it to move the guide slide to the product and back with a carriage that receives movement from the cams on the main camshaft in the inclined guides. In order to give the cutter a feed to the depth of cut before each working stroke, it is proposed to introduce another carriage, also in inclined guides, to receive movement from the cams on the auxiliary camshaft, which is activated for periodic rotation.

FIG. 1 shows a diagram of the machine with the proposed device; in fig. 2 is a diagram of copier thread 25 Code No. 4 1947

cutter, view along arrow A in FIG. one; in fig. 3 shows the mechanism for feeding the cutter before each working stroke, top view along arrow B in FIG. one; in fig. 4 is a cross-section of the machine with the proposed device in a modified design; in fig. 5 - the same (front view); in fig. b - a mechanism for feeding the cutter before each working stroke (top view); in fig. 7 is a longitudinal section of this mechanism along the VG line in FIG. 6; in fig. 8 - cross section; in fig. 9 - installation diagram of distribution drums.

On the back side of the headstock / (fig. 1), under the KS, there is a box for interchangeable gears 2 and brackets with two bearings, in which a threaded copier 3 is installed. At the left end of the shaft 4 of the longitudinal support there is a lever 5, at the end of which there are with spring shock absorber installed semi-6.

To the right of the lever 5 on the shaft 4 of the longitudinal support there are fixed a bracket 7 with a roller and a longitudinal support 8. Under the support 8, two carriages 5 and 10 are cut out. The carriage 9 is mounted in inclined guides on the side surface 385

the rest of the bed and is connected by means of, a pull 11 and a roller with the fist 12 of the auxiliary distribution drum 13.

On the carriage 9, a carriage 10 moving at an angle to the product is mounted, receiving movement by means of a pull 14 with a roller from the knuckles 15 and 16 on the main distribution drum 17. On the carriage 10 a ruler 18 is installed, on which the prism of the longitudinal support rests.

The drum 19 for turning off the machine is rigidly fixed on the shaft 20. At the opposite end of the same shaft, the drum 13 is also rigidly fixed. The drum 17 rotates freely on the shaft 20 together with the drum 21. The latter, by means of two fists 22 and 23, controls the switching of the drum 17 with fast rotation on slow and back.

The drum 13 is equipped with a cross feed mechanism (Fig. 3). In the worm gear pair 24 of this worm gear, the scholestern is attached to the fret face of drum 13. A ratchet 27 and a flywheel with a handle 26 are fixedly mounted on the front end of the worm shaft (at the workplace side) 29 another ratchet 27 with a key. and may have axial movement under the action of a short coil spring 28. The gear 29 is loosely mounted on the worm shaft and meshes with the toothed rack 30, at one end of which there is an adjusting screw 31, and on the opposite side spring 32 is of sufficient stiffness in order to move the rail 30 to the left.

As a cutting tool for applying threads, cutter 33 or a threaded comb can be used.

Suppose it is necessary to cut a cylindrical external thread on product I. To do this, with the machine inoperative, the product is inserted into the centers and secured, after which the machine is turned on by pressing the handle.

386

The main distribution drum 17 at the moment of switching on the machine rotates at a high speed corresponding to idling, and with the help of a fist 15 through the roller and the thrust 14 moves the carriage 10 to the rise, as indicated by the arrow a. As such, the ruler 18 rises and, through the support prism, rotates the front caliper 8; together with the caliper, the shaft 4 rotates with the lever 5 fixed on it with the half-nut 6 towards the threaded copier 3. At this moment the cutter 33 will accumulate in the position of removing the first chip.

The threaded copier 3, entering into engagement with the semi-nut 6, moves the front caliper 8 together with the shaft 4. Thus, threading occurs. The drum 17 with the help of the cams 22 and 23, mounted on the drum 21, is switched at this time to slow-rotation. The auxiliary distribution drum 13 and the drum 19 of the machine is stationary.

At the end of the working stroke of the supor 8, the reel 17 switches to high speed, the fist 16 moves the carriage 10 to the left (along arrow b), the cutter 33 moves away from the product and the half-nut 6 comes out of engagement with the threaded copier 3. Thereafter, the fist 15a of the reel 17 by means of a bracket 7 moves the longitudinal caliper 8 and the lever 5 with the half-nut 6 to the extreme right (initial) position.

When the carriage 10 moves to the right, it rests against the adjusting screw 31 of the cross feed mechanism. In this case, the rack 20 also moves to the right, rotating gear 29, ratchets 25 and 27, a worm gear and a worm gear 24 along with a drum 13. A rear drum fist moves the carriage 9 to the left in the direction of a solid arrow in, giving additional moving the cutter 33 towards the product I. This additional movement is the lateral feed of the cutter. During the return stroke, when the carriage 10 moves to the left, the rack and pinion 30

under the action of the spring: the 32 moves also to the left, and the ratchet 25 slides over the ratchet 27, without rotating the screw 24.

After the drum 13, set for a certain number of cycles (passes), is rotated at a certain angle, the reverse fist 34 with 1 roller HANDLE and the pulling 11 moves the carriage 9 to the right in the direction of the dotted arrow 2, retraction of the cutter 33 in the radial direction to the initial position. At this moment, the drum 19 will turn to such an angle that the support fixed on it through the system of levers located at the machine will turn off the main friction on the machine clutch. This ends threading a single product I.

According to the device (Fig. 4 and 5), the front caliper consists of three HOBlibix parts. One of them is the inner arm 35, rigidly mounted on the longitudinal shaft 4. Another trough-shaped part 36 sits longitudinally to the shaft 4, but can be turned on it at a certain angle. The third part is a slider 37 with a screw 38, carrying on itself a tool holder with a cutter 33.

The front carriage consists of a trough-shaped part 59 with vertically arranged dove-tail guides. It is bolted to the front vertical plane of the bed. A slider 40 is placed in the vertical guides of this part 39, which can move up and down under the action of the screw 41 and the nut 42. The screw in the middle part has a gear 43 coupled to the rack 44, cut into a brush 45, one end of which is connected to the slider 46 distribution drum 17, receiving the movement of the fists, mounted on this drum.

Guides 47 with carriage 48 are attached to slider 40, which can be angled as shown in FIG. 5. The carriage 48 is connected to a longitudinal roller 49 connected to the slider 50 of the rear auxiliary distribution drum, moving away from the fists fastened on this drum.

A carriage 51 is attached to the carriage 48, on which the pivot 36 of the longitudinal support rests.

The rear support lever is rigidly fixed on the shaft 53. A transverse support 54 is installed at the upper end of the lever. A spring 55 placed at the rear end of the support tends to pull the cutter 56 away from product I. At the upper end of the roller 57, the eccentric 58 is supported, on which roller 59 is supported. At the lower end of the roller 57 there is a brush located, connected by an upper end with a coupling having inclined end teeth. Gear engages with a circular rack. When the carriage of the rear caliper is moving, the rail rests against the ends in two stops 60 fixed to the carriage and, moving relative to the lever of the rear caliper, rotates the bristle and roller 57. So, as at the upper end of this roller an eccentric 58 is fixed, resting on roller 59, as the roller 57 rotates, the rear cutter 5 moves in the direction of the product I. This is how the rear caliper is fed transversely. The radial approach and retraction of the rear caliper is carried out by rotating the lever together with the shaft 55 by means of a moving rear ruler 61.

The main distribution drum 17 (Fig. 9) sits on a hollow shaft and is fixed to it with a pin 62. A worm gear 63 is bolted to the drum, which receives rotation from a screw connected kinematically to the feed mechanism. Through the hollow shaft passes the shaft 20, at the left end of which the drum 19 is fixed with a roll-edge to stop the machine after finishing the product. At the right end of the shaft 20, there is a screwworm 24 and an auxiliary distribution drum 13. At the left end of the hollow shaft, a drum 21 is fixed to switch the main distribution drum 17 from fast to

387

slow motion The drum 13 by means of a worm pair 24 receives a periodic rotation from the transverse feeding mechanism.

The bracket 62 of the cross feed mechanism (Fig. B-8) is bolted to the machine bed from the inside of the opening in which the auxiliary distribution drum 13 is placed. In this bracket is a roller 63, at the right end of which a screw is attached to which engages with screw bristles 24. Instead of a screw pair, helical gears can be used. The gear 24 is bolted to the auxiliary distribution drum 13 (FIG. 9). At the left end of the roller 63 there is a sliding cam clutch 64, which is connected to the roller with a key.

A gear 65 is loosely worn to the left of the coupling 64 on the roller 63. At the end of this gear there are protrusions with which the mobile cam clutch 64 can engage the clutch. A spring is placed inside the gear that holds the coupling and the brush in the uncoupled position. Gear coupled to the toothed rack 66, mounted on the end of the rod 45, receiving through slider 46 longitudinal movement from the fist, mounted on the main distribution drum 17.

At the end of the roller 63, ending in a square, is gear 67, coupled with gear 68 attached with four bolts to the flange of roller 69. Together with gear 68 to the flange of roller 69 a separating disk 70 with holes is attached, the number and location of which determine the number of passes when cutting threads and depth of cut for each pass. The fork 71 rotating on the studs 72 enters into the annular depression of the cam clutch 64 with two rollers 73 attached to the fork 71. At the opposite end of the fork 7 / there is a rod 77 that rotates at some angle around the axis 75. At the same end of the fork 71

388

there is a fist 75 with a spring 79 and an abutment limiting its deflection. A protruding plate 77 is fixed at the end of the rod 45 to periodically deflect the plug 71.

Product I is installed in the centers or secured in the cartridge, after which the machine is turned on with a handle located on the headstock. At this point, the main distribution drum 17 rotates rapidly. A fist-mounted 17 knob moves the slider 46 to the right. The rod 45 with the rack 44 also moves to the right. A toothed rack 44 rotates the gear 43 with the nut 42 and raises the screw 41 to the slider 40 with the ruler 52; at the same time, guides 47, carriage 48 and ruler 5 / move upwards. When lifting the ruler 52 through the prism turns the inner lever 55 of the suporta, together with the shaft 4 and the bracket 5 with the semi-nut fixed on it, which then engages with the threaded copier 3.

The movement of the rod 45 to the right of the toothed rack 66 rotates the gear 65 (Fig. 7), and the protruding plate 77 deflects the cam 76. At the same time, the fork 71 rotates and two cam rollers 73 fixed to it engages the cam clutch 64 in engagement with the gear 65. Together with thus, the rod 74 emerges from the orifice of the dividing disk 70. The gear 66 causes the rotation of the mufsa 64 and the roller 63. In this case, the auxiliary distribution drum 13 and the drum 19 are rotated by means of a screw-bolt 24 24 (Fig. 9). The angle of rotation of the ba key 13 is determined by the location of the tapered holes on the separating disk 70, since during rotation of the disk 70, the rod 74 with its end rests on its surface, holding the cam coupling 64 in engagement with the gear 65. At the time the rod 74 coincides with the hole in The disc 70 of the cam sleeve 64 under the action of the spring inside the gear 55 moves to the right and disengages from the gear 65, and the rotation of the roller 63 and the drum 13 stops.

During the rotation of the drum 13, the slider 50 under the action of the fist fixed on the drum 13 will move the rod 49 with the help of two rollers 78 to the left, and with it the carriage 48 (Fig. 4). Since the carriage 48 is located obliquely, its non-displacement will move the ruler 51 vertically upwards and the trough-shaped part 36 of the supor will rotate at a certain angle, bringing the cutter 33 closer to the product I. In this way, the feed to the required depth of cut will be made transversely.

At the time of supplying the cutter 33 to the product with the help of a screw 41, i.e. when the cutter is installed on the chips, the semi-nut with the threaded copier 3 is engaged. By turning the copier 5, the cutter 33 will move along the axis of the product I, producing thread cutting. At this time, the main distribution drum will rotate slowly, and the drum 13 will be stationary.

After the working stroke is completed, the drum 17 switches to high speed and the fist moves the slider 46 in the opposite direction, i.e., to the left. At the same time, the rod 45 and the gear rail 44 will move to the left. By turning the screw 41, the carriage 48 will go down, move the cutter 33 away from the product I and dismount the half-nut with the threaded copier 3. During the movement of the rod 45 in the opposite (left) direction the protruding end of The rod plate 77 deflects the cam 76, without causing movement of the plug 71, after which the cam 76 will again return to its original position under the action of the spring 79.

When the last working stroke is made (up to a given average diameter of the thread), the fist attached to the drum 19 (Fig. 9) will lift the lever and stop the machine.

The cutter 33 is supplied automatically to the chip during the first pass after turning on the machine, by appropriately selecting the distance between the holes on the separating disk 70, which rotates at the same angular speed as the auxiliary distribution drum 13.

Subject invention

Claims (4)

1. A device for automatic installation of a cutter in a working position on machines with a copying thread-cutting device using a ruler supporting the slide, which guides its movement, characterized in that, in order to bring the cutter 33 to the product and retract it, it is used to move the ruler 18 in the direction to the product and back carriage 10, moved at an angle to the axis of the product with the fists 15 and 16 on the distribution drum 17 (Fig. 1). 2. The modified tool according to claim 1, characterized in that to move the ruler 52, applied 41, rotated by the toothed rack 44, moved by the fist on the distribution drum (Fig. 4 and 5). 3. The form for making the tool according to claim 1, characterized in that for periodically feeding the cutter 33, the carriage 10 is mounted on a carriage 9 receiving movement at an angle to the product axis from the cam 12 on the auxiliary distribution drum 13, which rotation for a certain period of time includes the carriage 10 at the end of its movement for supplying the supor with the cutter 33 to the product (Fig. 1). 4. The form of making the devices according to claim 2, characterized in that for periodically feeding the cutter 33, the upper part 36 of the suporta is made movable relative to the product under the action of the ruler 51, the carriage 48 moving along the height, receiving movement from the cam on the auxiliary distribution drum 13 The rotation of which for a certain period of time includes the brush 45 carrying the toothed rack 66 (FIG. 4-9). J s 22 -Jf3 21 FIG. 3 2623 31 FIG. four 5s No. 68304 - 8 FIG. five In helle FIG. 6 75 fi, F 7 / -, FIG. eight t w FIG. 9