JPH09131615A - Tooth profile forming/photographing device for gear and tooth profile forming/photographing device for cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply provide the drawing of tooth profile of a gear formed a cutter. SOLUTION: A moving plate 3 is made to move without generating any slip by following the turning movement of a pitch disc 4 and a cutter original drawing 1 obtained by forming a cutter tooth profile on the moving plate 3 by means of an optically transparent line drawing 2 is partially fixed to the moving plate 3 and also a photographic paper 7 is fixed to the pitch disc 4 and its outer peripheral part is inserted below the original drawing 1 and movably stacked on each other. And a light projector 1 is provided above the original drawing 1, and the light is guided to be projected on the original drawing 1 as a narrow light band 11 after passing a fine gap 2 provided along the direction of a normal line at a lower part contact point, and during movement of the original drawing 1, the light passes the line drawing 2 at the cross point of light band 11 and the optically transparent line drawing 2 of the original drawing 1, marked on the photographic paper 7 as a point of light and displayed as a line constituting of continuous light spots by means of the movement of the original drawing 1 and the turning movement of the photographic paper 7 so that the drawing of a tooth shape to formed may be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear tooth profile generation / imaging device capable of capturing a tooth profile obtained by the cutter on a photographic paper in advance when the gear is created by a cutter. is there.

[0002]

2. Description of the Related Art When manufacturing a gear, it is known that a gear material is created by a pinion type cutter or a rack type cutter. What kind of tooth profile can be created by using these cutters? It could not be represented unless the trajectory of the cutter was obtained by complicated calculation, and it was not possible to know it easily.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device capable of easily knowing a tooth profile created by a rack cutter or the like without using a calculation formula or the like.

[0004]

According to the present invention, the outer peripheral surface of the pitch disc having the pitch circle of the gear to be created as the outer diameter is brought into contact with the side edge of the movable plate, and the pitch disc is rotated. Make sure that the movable plate moves without causing slippage, fix the photographic paper to the pitch disk, and fix the light-shielding cutter original diagram in which the tooth profile of the cutter is formed on the movable plate by the translucent diagram. In the vicinity of the contact point, the original drawings of the cutter are movably superimposed on each other above the photographic paper, and a light source is provided above the original drawing of the cutter so that the light from the light source is located at a predetermined position substantially along the normal line at the contact point. A narrow light band for irradiating the original drawing is formed with a length that can cover the entire tooth height of the cutter tooth profile, and the light is transmitted at the intersection of the optical band and the line drawing of the cutter original drawing while the cutter original drawing is moving. The light that has passed through the sex diagram is almost light For tooth profile creation of gears so as to be marked on the photographic paper imaging apparatus is provided as a point. Due to the movement of the original drawing and the photographic paper, this point of light becomes a continuous line,
The tooth profile of the gear to be created with a very simple structure is obtained on photographic paper. This tooth profile can be applied to gears with all the numbers of teeth with the same pitch by using pitch discs with different sizes, but only the tooth profile of the gear is printed on the photographic paper. Therefore, a second light source, which is adapted to project light toward the original drawing, is separately provided at an appropriate position outside the projector, and the corresponding light source is momentarily and momentarily irradiated while the original drawing is moving, so that a corresponding cutter can be provided. If the tooth profile can be overlapped with the tooth profile of the gear, the meshing state of the two can be known, which can be useful for preventing undercuts due to the cutter tooth profile. Further, in the device of the present invention, the tooth profile of the gear to be created or the tooth profile original made of the light-shielding sheet material in which the cross-sectional shape of the shaft outer periphery to be machined such as a spline shut is formed by a light-transmissive diagram The tooth profile of the cutter for cutting the tooth profile can be obtained by fixing to the pitch disk and printing the light from the light band through the slit of the diagram on the photographic paper fixed to the moving plate during rotation. . In this case as well, by irradiating the tooth profile original drawing with light from the second light source, the tooth profile of the corresponding gear is obtained overlapping with the cutter tooth profile. As one embodiment for forming the light band, a light projector is provided above the original drawing in the figure, and light from the light source is applied to the original drawing as a light band through a slit under the light projector.

[0005]

1 and 2 are a plan view and a side view showing an embodiment of the device of the present invention, in which the rack type cutter is used to create an invalid tooth profile. In the figure, the original drawing of the cutter (1) is made of a light-shielding sheet material such as a scribe sheet or a black paper, which is provided on the surface of a transparent polyester film with a light-shielding portion such as a black layer. A translucent diagram (2) corresponding to is formed. Diagram (2) shows if the original cutter (1) is a scribe sheet,
The light-shielding portion such as the black layer on the surface of the film can be formed by writing it off with a needle to make it transparent. This cutter original drawing (1) is placed on a transparent moving plate (3) such as an acrylic plate or a glass plate via a wide transparent receiving plate (3 ') by an adhesive tape or the like. Fixed.

Since the moving plate (3) is an example used for a rack type cutter in the figure, it is formed in a long plate shape. However, when a pinion type cutter or the like is used as the cutter, it is a cutter. Is formed into a disk shape having the outer diameter of the pitch circle. Further, in the figure, the moving plate (3) is supported by an appropriate supporting device such as a slide unit (not shown) so as to make a smooth linear movement, but in the case of a pinion type cutter, it makes a rotational movement. ing.

Adjacent to the moving plate (3) is provided a pitch disk (4) having an outer diameter of the pitch circle of the gear to be created. Although the pitch disc (4) is made of a transparent plate material such as an acrylic plate or a glass plate in the shape of a disc in the figure, it may be made of an ellipse or other non-circular shape.
Further, a receiving plate (6) having a diameter larger than that of the pitch disc (4) is coaxially fixed to the rotary shaft (5) of the pitch disc (4),
A printing paper (7) is fixed on the backing plate (6). Although the photographic paper (7) is formed in a circular shape and provided on the entire circumference in the figure, it may be formed in a rectangular shape, a fan shape or the like and provided in a part thereof so that the tooth profile is partially formed.

The pitch disc (4) rotates with its outer peripheral surface in contact with the side edge (8) of the moving plate (3),
Along with this, the movable plate (3) moves without causing slippage. The movable plate (3) may be moved by pulling it by hand and the pitch disc (4) may be driven, or may be driven by a motor and a rack or pinion system.

The contact surface between the outer peripheral surface of the pitch disk (4) and the side edge (8) of the moving plate (3) is roughened, serrated, or brought into a meshed state such as a rack and pinion. , The wires wound around the outer peripheral surface of the pitch disc (4) are attached to both ends of the moving plate (3) along the side edge (8) so that they are interlocked with each other without causing slippage. There is. Further, the shaft (5) of the pitch disk (4) is slidably mounted on the support base (9) via a bearing, and is biased toward the moving plate (3) by a spring (10), a weight and the like. .

A light projector (13) is fixedly provided on the device base above the normal line at the contact point between the movable plate (3) and the pitch disc (4), and the light from the light source (14) is emitted from the line. A narrow original optical band (11) is formed by passing through a slit (12) provided in a length close to the diagram (2) and covering the entire tooth height of the diagram (2), and the original cutter (1) ). The light projector (13) may have an appropriate configuration such as using a condenser lens. (FIGS. 2 and 3) Further, the light band (11) may have another structure such that the light beam is reciprocated within a predetermined length range. Also in this case, the light should not leak to the other side on the upper surface of the original drawing (1).
It is recommended to cover it with a dark box having a slit at the bottom.

The apparatus shown in the drawing is either put in a dark box or used in a dark room to fix the photographic paper (7) on the receiving plate (6) and to make a diagram of the original cutter (1). When the pitch line (15) of (2) is fixed on the receiving plate (3 ') of the moving plate (3) so as to match the side edge (8) of the moving plate (3), the photographic paper (7) The outer peripheral portion and the cutter original drawing (1) are movably overlapped with each other in the vicinity of the contact point between the movable plate (3) and the pitch disc (4). So moving plate (3)
While moving the lamp in the direction A of FIG. 1, for example, the projector (13)
When light is emitted from the photographic paper (7), the light passes through the translucent diagram (2) at the intersection of the light band (11) and the diagram (2).
Since the photographic paper (7) is marked on the top as a dot and the diagram (2) moves further, the photographic paper (7) rotates in the B direction.
It appears as a continuous line above and is therefore shown as a tooth profile (16) of the involute gear created by the development, as shown in FIG. 4, by the cutter tooth profile of diagram (2). This tooth profile can be applied to gears of all the numbers of teeth with the same pitch by replacing the pitch disc (4) with one of different size, but on the photographic paper (7) Only the tooth profile of the gear is shown, and the shape of the cutter diagram (2) is not shown. Therefore, although not shown in the drawing, it is arranged to project light in the direction of the cutter original diagram (1) at an appropriate place outside the projector (13) If two light sources are provided and the second light source is momentarily and momentarily turned on during the movement of the cutter original drawing (1), the corresponding cutter tooth profile shapes are overlapped and marked. It is possible to know the meshing state, which can be useful for preventing undercuts caused by the cutter tooth profile.

FIG. 5 shows another embodiment in which the upper surfaces of the moving plate (3) and the pitch disk (4) are substantially flush with each other, and the moving plate (3) is provided with one side of the original drawing (1). Adhesive tape (1
7) etc., and at the same time, the photographic paper (7) is similarly fixed to the pitch disk (4) with an adhesive tape (17), etc., and the outer peripheral portion of the photographic paper (7) other than the cutter original drawing (1) It is inserted under the side and is movably superposed on each other in the vicinity of the contact point of the moving plate (3) and the pitch disc (4). By the same movement as the previous example, the rack tooth profile of the original drawing (1) is moved. (2)
The tooth profile of the gear is photographed on photographic paper (7). According to this embodiment, the cutter original drawing (1) and the printing paper (7) can be easily attached and detached, which is extremely convenient in use. in this case,
The photographic printing paper (7) may be sandwiched between a transparent plastic sheet or the like having the appropriate rigidity such as the polyester film. Further, in this case, the pitch disc (4) and the moving plate (3) do not have to be translucent.

Further, by using the above device, when the tooth profile of the gear is known, the tooth profile of the cutter for creating this tooth profile can be represented. For example, in order to know the shape of the cutter for creating the tooth-shaped spline (18) as shown in FIG. 6, the tooth profile of the spline (18) can be represented by a diagram (2
The original plate (1a) shown in (a) is fixed to the pitch disk (4a), and one side of the photographic paper (7a) is brought into contact with the pitch disk (4a) at the side edge (8a). The other side of the photographic paper (7a) is fixed to the original drawing of the spline (1
a) underneath and movably overlapping each other, while rotating the pitch disc (4a) in the direction of arrow B, the optical band (11a)
By irradiating light with, the tooth profile (19) of the cutter is obtained on the printing paper (7a) moving in the direction of arrow A. In this case as well, by irradiating light from the second light source provided on the outside of the projector in a timely manner, the corresponding tooth profile (2a) of the spline is obtained in duplicate, and the tooth profile of the spline meshes with the tooth profile of the cutter. You can know the condition.

[0014]

The present invention is constructed as described above, and it is possible to obtain the tooth profile of the gear created from the tooth profile of the cutter without the need for complicated calculations with an extremely simple structure, and to create it from the tooth profile of the gear. Tooth profile of the cutter used for
Alternatively, the tooth profile of the mating gear to be meshed can be known, which is convenient and easy to operate. In addition to the above, it has an excellent effect that it can be used for many purposes such as internal gears and chain sprockets. ing.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 Both sides on the same side.

FIG. 3 is a partially enlarged vertical front view.

FIG. 4 is an explanatory view of an operation showing a state where a tooth profile is created from an original drawing of a cutter.

FIG. 5 is a partial side view showing another embodiment.

FIG. 6 is an explanatory diagram of an operation showing a state in which a tooth profile of a cutter for creating the spline is formed from the outer shape of the spline.

[Explanation of symbols]

 1. Cutter original drawing 2. Translucency diagram 3. Moving plate 4. Pitch disc 5. Rotation axis 7. Printing paper 10. Bane 11. Light band 12. Gap 13. Floodlight 14. Light source

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Arie 3-I7-1-305, Hagiyama-cho, Higashimurayama-shi, Tokyo

Claims (6)

[Claims] 1. A pitch disc (4) having a pitch circle of a gear to be created as an outer diameter, and a moving plate (3) contacting an outer peripheral surface of the pitch disc (4) at a side edge (8). The movable plate (3) is moved in association with the rotation of the pitch disc (4) without causing slippage at the contact point,
The printing paper (7) is fixed to the pitch disc (4), and the light-shielding original drawing (1) in which the cutter tooth profile is formed by the translucent diagram (2) is fixed to the moving plate (3). Then, in the vicinity of the contact point, the original drawing (1) is movably superposed on the photographic paper (7), and a light source is provided above the cutter original drawing (1) so that the light from the light source contacts the contact surface. A narrow optical band (11) for irradiating the original drawing (1) is formed at a predetermined position substantially along the normal line at a point with a length that can cover the entire tooth height of the cutter tooth profile. During the movement of 1), the light band (11) and the diagram (2)
The gear tooth profile generating / imaging device according to claim 1, wherein the light passing through the diagram (2) is marked on the photographic paper (7) at the intersection point of. 2. The light from the light source (14) in the light projector (13) provided at a predetermined position above the original drawing (1) by the light band (11) is provided with a slit (12) below the light projector (13). ) Is applied to irradiate the original drawing (1) to form the image.
The gear tooth profile generation / imaging device according to [1]. 3. In addition to the light source for forming the light band (11), a second downward light source is provided at an appropriate position above the original drawing (1), and the light source is momentarily turned on during operation. The gear tooth profile generating / imaging device according to claim 1, wherein the shape of the diagram (2) of the cutter original drawing (1) can be printed on the photographic printing paper (7). 4. A pitch disc (4a) having a pitch circle of a gear to be created as an outer diameter, and a moving plate (3a) contacting an outer peripheral surface of the pitch disc (4a) at a side edge (8a). The moving plate (3a) is moved along with the rotation of the pitch disc (4a) without causing slippage on the contact surface, and the tooth profile of the gear to be created is formed on the pitch disc (4a). The movable plate (3a) is fixed together with the light-shielding original drawing (1a) formed by the transparent drawing (2a).
The photographic paper (7a) is fixed to the paper, and the original drawing (1a) is movably superposed on the photographic paper (7a) in the vicinity of the contact point, and a light source is provided above the original drawing (1a). A narrow light band (11) that illuminates the original drawing (1a) with a length such that the light from the light source can cover the entire tooth height of the tooth profile of the gear at a predetermined position substantially along the normal line at the contact point.
a) is formed so that, during the rotation of the original drawing (1a), the light passing through the drawing (7a) at the intersection of the optical band (11a) and the drawing (2a) is rotated. ) A tooth profile forming / imaging device for a cutter characterized by being marked above. 5. The light band (11a) is the original drawing (1a).
5. The tooth profile forming / imaging device for a cutter according to claim 4, wherein light from a light source in a light projector provided at a predetermined position above the light source is radiated onto the original image (1a) through a slit in the lower portion of the light projector. . 6. In addition to the light source for forming the light band (11a), a second downward light source is provided at an appropriate position above the original drawing (1a), and the light source is momentarily turned on at appropriate times during operation. The tooth profile forming and photographing device for a cutter according to claim 4, wherein the shape of the diagram (2a) of the tooth profile original diagram (1a) can be marked on the photographic printing paper (7a).