JPS6325881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a cam-type copying machine suitable for a cam-type copying machine, especially one that requires high precision, such as cutting the inclined tape guide surface of a head cylinder used in a magnetic recording/reproducing device. This relates to processing equipment.

Conventionally, this type of cam-type copying machine has been implemented, for example, as shown in FIG. That is, in the same figure, 1 is the main body, and the drive device 2 is installed on the top surface.
and a copy processing device 3. One of the drive devices 2 is composed of a motor 4 and a headstock 5, and the motor 4 has a pulley 6 fixed to its shaft end.
The headstock 5 rotatably supports a main shaft 7, a pulley 9 connected to the pulley 6 via a belt 8 is fixed to one end of the main shaft 7, and a front cam 10 and a workpiece 11 are fixed to the other end. are fixed so that they are at the same central position. The details of the configuration of the other copying device 3 will be described later, but the basic principle of its configuration is that the cam surface 1 of the front cam 10
0a, when the roller 12 moves in the direction of the arrow, the cutting tool 13 moves in synchronization with this to transfer the profile of the cam surface 10a to the workpiece 11, and at the same time transfer the cutting tool 13 to the roller 12. When moving in the direction of the arrow separately from the movement, a tape running surface 11a of a predetermined length is cut on the outer peripheral surface of the workpiece 11, and the stepped end surface 11 of this tape running surface 11a is cut.
The profile of the cam surface 10a is transferred to the cam surface 10a. Therefore, in order to accurately transfer the profile of the cam surface 10a to the workpiece 11, the roller 12 and the cutting tool 13 of the copying device 3 must be accurately synchronized. To this end, it is necessary that the transmission mechanism between the roller 12 and the cutting tool 13 has as little error as possible during movement.

In contrast, one example of a conventional copying device 3 is shown in FIGS. 2 to 5.

That is, Fig. 2 is a bottom view showing a conventional copying machine, Fig. 3 is a cross-sectional view taken in the direction of - arrow in Fig. 2, Fig. 4 is a front view in cross-section taken in Fig. 3 - 4
It is a sectional front view taken along the arrow - in the figure. In the figure, reference numeral 14 has a rectangular cross section, and is movably supported by the main body 1, and includes a circular cylinder 14a that passes through the center in the longitudinal direction, and a circular cylinder 14a that is connected to the cylinder 14a and that is connected to the cylinder 14a in the longitudinal direction. A rectangular hole 14b penetrating in a right angle direction is formed.

The width of this rectangular hole 14b is determined by the slider 2, which will be described later.
4, so that the slider 24 can move in the width A direction within the rectangular hole 14b. Reference numeral 15 designates a first piston having a circular cross section, and a small diameter portion 15a that connects to the outer peripheral portion of the first piston.
and a large-diameter portion 15b, and a small-diameter cylinder 15c and a large-diameter cylinder 15d that are connected to each other are formed inside. The small diameter portion 15a is slidably supported in the longitudinal direction within the cylinder 14a of the body 14, and has a pin 16 at its tip to rotatably support the roller 12, and has the rectangular hole 14b approximately in the center.
A rectangular hole 17 having the same shape as the connecting hole 17 is provided. A side cover 18 is fastened to the rear end surface of the large diameter portion 15b with bolts 19 so that the tip protrusion 18a is inserted into the inner end surface of the large diameter cylinder 15d. This side cover 18 has a part of its outer periphery projected, and a spring 20 is interposed between this and the body 14 to constantly press the roller 12 against the cam surface 10a of the front cam 10 via the first piston 15. It's inserted.

A second piston 21 has a small diameter portion 21a movably supported within the small diameter cylinder 15c of the first piston 15, and a large diameter cylinder 15d of the first piston 15 fixed to the small diameter portion 21a.
The large diameter portion 21b is movably supported within the large diameter portion 21b. The small diameter portion 21a is connected to a pentagonal hole 17 of the first piston, and has a rectangular hole 22 formed in substantially the same shape as a slider 24, which will be described later.
A set screw 23 for fixing the rider 24 is provided inside. The slider 24 has a rectangular cross section, has a cutting tool support piece 25 fixed to one end that moves along one end surface of the body 14, and has a guide plate 26 fastened to the other end that moves the other end surface of the body 14. ing. The above tool support piece 25 is a set screw 2
7 fixes the bite 13. In addition, illustration 28
a, 28b are the small diameter portions 15 of the first piston 15;
These are O-rings inserted between the small diameter part 21a and the large diameter part 21b of the second piston 21, and the large diameter part 15b. Reference numerals 29a and 29b are oil supply and discharge ports formed in the large diameter portion 15b of the first piston 15 and the side cover 18, respectively. With the above configuration, pressurized oil is supplied from one oil supply/discharge port 29a to the left chamber of the large diameter portion 21b of the second piston 21 in the large diameter cylinder 15d of the first piston 15, and the large diameter portion 21b is closed to the side cover. 18 tip protrusion 18a
to be pressed. In this state, when the roller 12 moving on the cam surface 10a of the front cam 10 moves the first piston 15 to the left with respect to FIG. 3, the second piston 21 moves to the left via the side cover 18. Therefore, byte 13 via slider 24
moves to the left to transfer the profile of the cam surface 10a of the cam 10 onto the workpiece 11. Further, when pressure oil is discharged from one oil supply/discharge port 29a and pressure oil is supplied from the other oil supply/discharge port 29b, the second piston 21 moves within the first piston 15 and passes through the slider 24 to the cutting tool 13. is moved to the left, so that the tape running surface 10 is placed on the outer peripheral surface of the workpiece 11.
The cutting tool 13 moves in conjunction with the roller 12 to transfer the profile of the cam surface 10a onto the stepped end surface 10b of the tape running surface 10a.

However, in the above configuration, since the first piston 15 and the second piston 21 have a circular cross section,
It is not possible to maintain the cutting edge position of the cutting tool 13 in the circumferential direction.
4, the slider 24 is connected to the rectangular hole 14a of the body 14 and the first piston 1.
In order to move within the rectangular hole 14b of No. 5, both
4 and 14a and 14b, it is difficult to accurately maintain the position of the cutting edge of the cutting tool 13 in the circumferential direction. The bite 13 against the roller 12 due to the viscous resistance between
Tracking performance decreases. Furthermore, the second piston 21
Since the first piston 15 and the holder 14 are interposed between the position of the cutting edge of the cutting tool 13 and the position of the cutting edge of the cutting tool 13, the lengths of both 21 and 13 become longer.
When the workpiece 11 is cut in step 3, the slider 2
A bending moment is generated at the roller 4, making it impossible to accurately synchronize the roller 12 and the cutting tool 13. Therefore, the cam surface 10a of the cam 10 is
profile cannot be transferred to the workpiece 11, and as a result, highly accurate processing cannot be performed.

Therefore, conventional methods have been implemented as shown in FIGS. 6 to 8. That is, FIG. 6 is a partially sectional side view showing another embodiment of the conventional copying device, FIG. 7 is a top view thereof, and FIG. 8 is a sectional front view taken in the direction of the arrow in FIG. 6. In the figure, reference numeral 30 denotes a base, and a dovetail groove 30a is formed in the longitudinal direction on the upper surface, and a spring retainer 31 is fixed upright on the rear end surface. A first slider 32 is mounted on the upper surface of the base 30 via a dovetail groove 30a so as to be slidable in the longitudinal direction.A shaped bracket 33 is fixed to one end surface of the slider. A second slider 35 is mounted so as to be slidable in the longitudinal direction, and a hydraulic cylinder 36 is fixed to the upper part of the rear end surface. The bracket 33 has a pin 3 at its upper end.
The roller 12 is rotatably supported via the roller 7. The second slider 35 has a hole 3 that is formed in a rectangular shape and penetrates in a direction perpendicular to the longitudinal direction of the inside.
8 is formed, and the cutting tool 13 is fixed in this hole 38 with a set screw 39. The above hydraulic cylinder 36
A piston 40 is provided which moves by supplying and discharging pressure oil from two oil supply and discharge ports 36a and 36b, and the second slider 35 is fixed to the tip of this piston 40. A spring 41 is inserted between the spring retainer 31 and the first slider 32, and is connected to the first slider 32 and the bracket 3.
3, the roller 12 is always connected to the cam surface 1 of the cam 10.
It is pressed to 0a. Because of the above configuration,
The piston 40 is pressed against the right end of the hydraulic cylinder 36 by pressure oil from one oil supply/discharge port 36a. In this state, when the roller 12 is moved to the left in the figure by the cam surface 10a of the cam 10, the first
Slider 32, hydraulic cylinder 36, piston 40
Then, the cutting tool 13 moves to the left via the second slider 35 to transfer the profile of the cam surface 10a of the cam 10 onto the workpiece 11. Further, when pressure oil is discharged from one oil supply/discharge port 36a and pressure oil is supplied from the other oil supply/discharge port 36b, the piston 4
0 moves to the left on the first slider 32 by hydraulic pressure, so a tape running surface 10a is cut on the outer peripheral surface of the workpiece 11, and a stepped end surface 10b of the tape running surface 10a is attached to the roller 12. The profile of the cam surface 10a of the cam 10 is transferred by the interlockingly moving cutting tool 13.

Therefore, in the above configuration, there are two dovetail grooves 30a, 34.
The fact that the cutting edge position of the cutting tool 13 in the circumferential direction can be determined by this has an advantage compared to the above embodiment. However, on the other hand, there are two dovetail grooves 3.
0a, 34, and the first slider 32 and the second slider 32 are provided.
Since the slider 35 moves at an eccentric position,
The overall shape is larger than in the case where the first piston and the second piston move on the same axis as in the above embodiment. Further, since the roller 12 is supported at the upper end of the upright bracket 33, the position where the spring 41 presses and the roller 12 are supported.
Since the pressing position is eccentric to the cam surface 10a of the bracket 33, the upper end of the bracket 33 is bent, causing an error in the amount of movement between the roller 12 and the first slider 32. In addition, since the first slider 32 and the second slider 35 move at eccentric positions relative to each other, an error in the amount of movement occurs due to viscous resistance of both sliders 32 and 35.
The profile of the cam surface 10a of 0 cannot be accurately transferred to the workpiece 11.

In this way, in conventional cam-type copying machines, it is not possible to accurately transfer the profile of the cam surface of the cam to the workpiece, so the inclined tape guide surface of the head cylinder used in magnetic recording and reproducing devices is This poses a problem when high precision is required, such as when cutting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cam-type profiling machine which eliminates the above-mentioned drawbacks and enables highly accurate machining by accurately transferring the profile of the cam surface of a front cam onto a workpiece.

In order to achieve the above object, in the present invention,
In a cam-type copying device, rolling members are arranged between the body and the first movable body and between the first movable body and the second movable body, and the first movable body and the second movable body are aligned with the axis. By configuring the movable body to be movable only in this direction, each movable body can be moved smoothly and high-precision machining can be performed.

An explanation will be given below with reference to FIGS. 9 and 10 showing examples. FIG. 9 is a side view showing an embodiment of the present invention, and FIG. 10 is a front view thereof. Note that parts that are the same as those in FIG. 1 are designated by the same reference numerals.

In the figure, 42 is a body, and a square hole 43 opening at one end surface is formed. A first moving body 45 is supported by the body 42 via a ball 44 so as to be movable only in the axial direction of the front cam 10. A roller 12 in contact with the cam surface 10a is rotatably supported via a pin 16 on the surface of the first moving body 45 facing the front cam 10, and a square hole 46 is formed in one end surface. ing.
47 is a second moving body, and a ball 48 is placed in the hole 46.
is supported so as to be movable only in the axial direction. The cutting tool 13 is fixed to one end surface of the second moving body 47 by a set screw 54.
A hydraulic cylinder 49 is fixed to one end of the first moving body 45 and has a piston 50 connected to the second moving body 47. A spring 51 is stretched between the body 42 and the hydraulic cylinder 49, and biases the first moving body 45 toward the front cam 10.

With the above configuration, when the front cam 10 is rotated with the roller 16 in contact with the cam surface 10a of the front cam 10 under the tension of the spring 51, the first moving body 45 moves along the cam surface 10a. In Fig. 9, it moves in the left and right direction. At this time, the second movable body 47, which is integrally coupled to the first movable body 45 by the hydraulic cylinder 49 and its piston 50, also moves in the left-right direction together with the first movable body 45, so that the cutting tool 13 also
Move left and right along 0a.

In this state, when the hydraulic cylinder 49 is operated and the piston 50 is moved to the left in FIG. It moves to the left regardless of the movement of the body 45. Therefore,
The cutting tool 13 also moves to the left to cut the workpiece. Then, when the hydraulic cylinder 49 moves the piston 50 by a predetermined amount and stops, the profile of the cam surface 10a is transferred to the workpiece.

As described above, according to the present invention, rolling members are arranged between the body and the first movable body and between the first movable body and the second movable body, so that the first movable body and the second movable body Since the body is configured to be movable only in the axial direction of the front cam, the movement of each moving body is smooth.
Moreover, since the amount of gap between the body and the first moving body and between the first moving body and the second moving body can be minimized, the profile of the cam surface can be accurately transferred to the workpiece. It is possible to improve machining accuracy.

[Brief explanation of the drawing]

Fig. 1 is a top view showing a conventional cam type copying machine, Fig. 2 is a bottom view showing an example of the copying machine, Fig. 3 is a sectional view taken along the - arrow in Fig. 2, and Fig. 4 is a 3 is a sectional view taken in the direction of the arrow in FIG. 3, FIG. 5 is a sectional view taken in the direction of the arrow in FIG. 8 is a sectional view taken in the direction of the arrow in FIG. 6, FIG. 9 is a partially sectional side view showing one embodiment of the present invention, and FIG.
Figure 0 is its left side view. 10...Front cam, 10a...Cam surface, 11...Workpiece, 12...Roller, 42...Body, 43, 46
... Hole, 44, 48... Ball, 45... First moving body,
47...Second moving body, 49...Hydraulic cylinder, 50...
Piston, 51...spring.

Claims (1)

[Claims] 1. A first movable body that moves in the axial direction along the cam surface of a front cam that rotates on the same axis as the workpiece, and a tool that cuts the workpiece, and supports the first movable body. A second moving body that is connected to the piston that moves within the supported cylinder and moves in the axial direction is provided, and the second moving body and the first moving body are moved synchronously and independently to move the cam surface. A cam-type copying device that transfers a profile to a workpiece, wherein the first moving body is fixed to a body that supports it only in the rotational direction, and is provided so as to be movable in the axial direction via a rolling member, 2nd above
A cam-type copying device, characterized in that a movable body is provided so as to be fixed to the first movable body only in the rotational direction.