JPS6325662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and apparatus for making a circular image for transfer from a rectangular original, either transparent or reflective and, if transparent, either a negative or a positive, onto a flat white background painted on a cylinder. Regarding.

It is known that a flat white background, such as a metal blank, can be preprinted and drawn onto a cylindrical body, such as a cylindrical container with an integrally formed end. In addition, pre-printing on a flat white background is done during the drawing process, and it is necessary to compensate for distortions caused by the drawing process so that the finished product almost represents the intended shape. It is known that this can cause certain distortions.

The main object of the present invention is to provide a method for transferring a circular image from a rectangular transparent or reflective original to a flat white background drawn on a cylinder, said method being carried out at a constant linear velocity perpendicular to the camera lens axis. moves the rectangular original along its length, in a plane perpendicular to the lens axis in synchronization with the linear movement of the original around an axis that is parallel to the lens axis and located on or to one side of the lens axis. rotates the photographic film, thereby causing the film to undergo one complete rotational movement during one complete movement of the original in one direction, and passing the film through a stationary slot that is narrow in width and extends radially and along the length of the axis of rotation. exposing the original image on top.

Another aspect of the invention is an apparatus for creating a circular image from a rectangular transparent or reflective original on a flat white background painted on a cylinder, the apparatus supporting the rectangular original and maintaining a constant angle perpendicular to the lens axis. a camera comprising on one side thereof a device for moving the original along its length at a linear velocity; and a completely linear motion of an original supporting device arranged on the opposite side of the lens and perpendicular to the lens axis and in one direction. a film holder which moves synchronously through one complete revolution and whose axis of rotation is parallel to and is located on or to one side of the lens axis; and a stationary slot through which the original image is exposed on the film. and a slot forming device supported in close proximity to the film holding surface of the film receiver for forming the film, the slot having a narrow width and extending in a radial direction of the axis of rotation of the film receiver.

The invention will be explained below by way of example embodiments with reference to the drawings.

In the figure, the image to be transferred to the drawn cylinder is formed in the usual manner on a rectangular master, as shown in FIG. 2, and exposed photographically on photographic film;
The circular conversion correction diagram shown in FIG. 3 is obtained using the apparatus shown in FIG.

This device is equipped with a camera, of which only the necessary parts are illustrated, which supports a rectangular original image 2 (not shown) on one side of its lens 1, and has a fixed linear shape perpendicular to the axis 3 of the lens 11. It includes a device that moves along its original length at a velocity. The device can be of any type. A film holder 4 is located opposite the lens 1 and is arranged for one complete rotation in one direction synchronized with one complete linear movement of the original support. Any suitable type of device (not shown) for rotating the film holder in this manner may be used. The rotational axis 5 of the film holder 4 is parallel to the lens axis 3 and on the lens axis 3.
Alternatively, the axis 5 shown in FIG. 1 is placed directly below the axis 3.

The film holder 4 has a cylindrical shape and is rotatable within a cover 6 which is attached to the end of a camera bellows (not shown) remote from the lens. The cover 6 may be combined with the camera bellows in any desired manner, but
The illustrated embodiment includes a door pivotally coupled to the distal end of the camera bellows.

The slotting device is supported in close proximity to the film holding surface 7 and perpendicular to the axis 3 of the lens 1, and a duct (not shown) is provided in the film holder and extends to the film holding surface 7. The duct is connected to a pressure source (not shown) through a pipe 8, and provides negative pressure to hold the photographic film toward the film holding surface 7 while the film holder is rotating.

The slotted device includes a vertical slot 9 formed in a flat plate 10 attached to the cover 6 and a film receiver 4 supported on the flat plate 10 for adjustment relative to each other so as to cover this slot. A stationary slot 1 through which the original image 2 passes on a film supported by
It includes a shutter 11 that determines the width of the shutter. The original image is illuminated by a light source 13. The slot 12 has a narrow width and extends radially with respect to the rotation axis 5 of the film receiver 4.

The spacing between the shutters 11 is adjusted by any suitable means not shown, and the slotted edges of the shutters are parallel to each other. If desired, the slot-forming edge of the shutter is arranged to form a slot with a width that diverges from the axis of rotation of the film holder.

Regarding the function, the combined cover 6
The distal end of the camera bellows is positioned within the darkroom for mounting photographic film supported on the film holder and for removing the film from the film holder for development. An original support and lateral transfer device is arranged in an adjacent chamber, and a camera bellows passes through a wall common to the two chambers.

Originals, either in transparent or reflective format and either negative or positive, are placed on the original support and lateral transport device, and photographic film is loaded into the film receiver. As shown in FIG. 1, it is assumed that the original image is transparent. An actuating device (not shown) is then actuated and the film tray completes one complete rotation during one complete linear movement of the original image support device in one direction, during which the original image is illuminated by the light source 13. The photo film is then exposed through the slot 12 onto the photographic film. This film is then removed and
The circular image on the film is transferred to a flat white background which is developed in a known manner and drawn to form a cylinder. By this method, both line drawings and half-scale drawings can be obtained, and it is particularly effective in producing half-scale drawings.

In preparing the original, the original must be drawn to a standard size, which is the size of the linear movement of the original support. This dimension has been found to be preferably 10 inches (25.4 cm).

For any magnification set by the camera, the speed of the image crossing the slot matches the speed of the photographic film,
It will be appreciated that there is one given image diameter at which maximum sharpness is obtained at this location.

[Brief explanation of the drawing]

FIG. 1 shows a schematic perspective view of the apparatus according to the invention, FIG. 2 shows a rectangular original image, and FIG. 3 shows a transformed corrected image made from the original image of FIG. 2 on a flat white background. 1... Lens, 2... Rectangular original picture, 3... Lens axis, 4... Film holder, 5... Rotation axis, 6...
...Cover, 7...Film holding surface, 8...Pipe, 9...Vertical slot, 10...Flat plate, 11...Shutter, 12...Stationary slot, 13...Light source.

Claims (1)

[Scope of Claims] 1. A method for creating a circular image to be transferred onto a flat white background drawn on a cylindrical body from a rectangular transparent or reflective original image, the method comprising: forming a rectangular image at a constant linear speed perpendicular to the axis of a camera lens; moving the original and rotating the photographic film in a plane perpendicular to the lens axis in synchronization with the linear movement of the original around an axis parallel to the lens axis and placed on or to one side of the lens axis; and make the film perform one complete rotational movement during one complete movement of the original in one direction,
A method of creating a circular image from a rectangular original including the step of exposing the original image on film through a stationary slot that is narrow in width and extends along the radial length of an axis of rotation. 2. To compensate for fluctuations in the angular velocity of the film,
A method for creating a circular image from a rectangular original image according to claim 1, wherein the width of the slot gradually widens from the axis of rotation. 3 A device for creating a circular image to be transferred onto a flat white background drawn on a cylindrical body from a rectangular transparent or reflective original, which supports the rectangular original and moves the original at a constant linear speed perpendicular to the lens axis. 1 complete linear movement of a camera containing a longitudinally moving device on one side of its lens and an original support device located on the opposite side of the lens and having a film holding surface perpendicular to the lens axis and in one direction; a film holder which makes one complete revolution synchronously with the lens axis, the axis of rotation of which is perpendicular to the lens axis and which is located on or to one side of the lens axis; and a stationary slide through which the original image is exposed on the film. a slot forming device supported in close proximity to the film holding surface of the film holder so as to form a slit, the slit having a narrow width and extending in the radial direction of the rotational axis of the film holder; A device that creates circular images. 4. The film holder is rotatable within the cover combined with the end of the camera that is farther from the lens, and the slot forming device covers the slot formed on the flat plate attached to the cover and covers the slot. Claim 3 comprising shutters supported on said plate to be adjusted relative to each other to determine the width of the slot.
A device for creating a circular image from a rectangular original picture as described in Section 1. 5. An apparatus for creating a circular image from a rectangular original image according to claim 4, wherein the shutter has slotted edges parallel to each other. 6. Creating a circular image from a rectangular original image according to claim 4, wherein the shutter has a slot forming device arranged to form a slot with a width that increases in width from the rotational axis of the film holder. Device. 7. Apparatus for producing a circular image from a rectangular original according to any one of claims 4 to 6, wherein the cover includes a door pivotably attached to the end of the camera bellows. 8. The duct provided in the film holder extends to the film supporting surface of the film holder and is connectable to a negative pressure source for holding the film facing the surface while the film holder is rotating. 7th
A device for creating a circular image from a rectangular original picture as described in any one of the preceding paragraphs.