JP3401770B2 - Film transport device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film transport apparatus, and more particularly, to a camera, a film scanner, and the like using a film cartridge in which a photographic film is wound around a single spool. The present invention relates to a film transport device applied to a film transport device. 2. Description of the Related Art Conventional film transport apparatuses of this type include:
When the film cartridge is mounted at a predetermined position, the film cartridge is provided with a so-called film loading function, in which the film is electrically pulled out of the film cartridge and the film leader is wound around a take-up reel. (JP-A-62-172332, JP-A-3-1
No. 67537). [0003] In a film transport apparatus described in Japanese Patent Application Laid-Open No. 62-172332, a sprocket and a take-up reel which are engaged with the perforation of the film are simultaneously driven at the initial stage of film loading, and are taken up at the end of loading. Only the film is driven by driving only the film, and it is detected from the film feed amount at the end of the loading whether or not the film is satisfactorily wound on the take-up reel. On the other hand, in the conventional film cartridge, the leader portion before use of the film is exposed from the film cartridge. In recent years, all films including the leader portion are stored in the film cartridge regardless of before and after use. One in which the leader portion is not exposed has been proposed. This type of film cartridge is configured so that a film stored in the cartridge is sent out by rotating a spool of the cartridge. The film transport device described in Japanese Patent Application Laid-Open No. Hei 3-167737 detects the time required for winding a film when film loading is performed using the above film cartridge, and detects the time required for winding the film. It is detected whether or not the film is wound around the take-up reel. [0006] Incidentally, one of the reasons that the film cannot be satisfactorily wound around the take-up reel during film loading is that the spool of the film cartridge does not engage with the spool drive shaft. May not be sent out. The present invention has been made in view of such circumstances, and it is possible to automatically load a film even if the leader portion of the film is not exposed from the film cartridge. It is an object of the present invention to provide a film transport device in which the fitting of the film can be surely performed and the film can be sent out from the film cartridge satisfactorily. In order to achieve the above object, the present invention uses a film cartridge in which a photographic film is wound on a single spool and all the films including a leader portion are stored. And a film transport unit that transports the film between a film supply unit on which the film cartridge is mounted and a film winding unit having a winding reel that winds the film supplied from the film supply unit. A cartridge accommodating portion for accommodating a film cartridge, and an axially slidably disposed so as to be fitted to a spool of the film cartridge accommodated in the cartridge accommodating portion, and a spring bias in a direction for engaging with the spool. Spool drive shaft that is
A drive unit for applying a rotational driving force to the spool drive shaft, the drive unit rotating the spool drive shaft in a direction in which a leader unit is sent out from the film cartridge during film loading; and Fitting detection means for detecting whether or not the spool drive shaft is fitted with the spool of the film cartridge from the sliding position of the drive shaft in the axial direction; and wherein the fitting detection means comprises the spool drive shaft and a spool of the film cartridge. Control means for disabling the driving means from sending out the leader portion from the film cartridge until the engagement with the film cartridge is detected. According to the present invention, the spool is slidably disposed in the axial direction so as to be fittable with the spool of the film cartridge, and is urged by a spring in the direction fitted with the spool. The drive shaft is provided with fitting detection means for detecting a slide position of the spool drive shaft, and the fitting between the spool drive shaft and the spool of the film cartridge is detected based on the output of the fitting detection means. ing. The drive of the spool drive shaft is prohibited until the fit detection means detects the fit between the spool drive shaft and the spool. A preferred embodiment of a film transport device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing one embodiment of a film scanner including a film transport device according to the present invention. As shown in FIG. 1, the film scanner mainly includes a fluorescent lamp 10 for illumination, a photographing lens 12,
It comprises a CCD line sensor 14, an image processing device 16 including an image memory and the like (not shown), a film transport device according to the present invention, and the like. The developed photographic film 20 used in this film scanner is, for example, shown in FIG.
Perforation 20A at the front end of one frame as shown in
, Which are all wound into a film cartridge 22 having a single spool 22A. Further, no perforation is formed in the leader portion 20B of the film 20. That is, the perforation 20A is used for specifying an image recording area of one frame. In FIG. 1, the fluorescent lamp 10 is disposed so that its longitudinal direction is perpendicular to the transport direction of the film 20, so that it can be illuminated over the entire width of the film 20. The transmitted light that has passed through the film 20 forms an image on the light receiving surface of a CCD line sensor 14 disposed in a direction orthogonal to the film transport direction via the photographing lens 12.
When reading a film image, the film 20 is transported at a constant speed as described later. The image light formed on the light receiving surface of the CCD line sensor 14 is charged and accumulated by each sensor provided with R, G, B filters, and the amount of R, G,
It is converted into B signal charges. The R, G, and B signal charges thus accumulated are read out to the shift register by a transfer gate pulse applied from a CCD drive circuit (not shown), and are sequentially read out by a register transfer pulse. The R, G, B signals for one frame read from the CCD line sensor 14 at the time of reading a film image are output to the image processing device 16. The image processing device
A / D (not shown) for the input R, G, B signals for one frame
The signal is converted into a digital signal by a converter, subjected to required signal processing, and stored in an image memory. One frame of R, G, and B signals stored in the image memory are repeatedly read out, converted into analog signals by a D / A converter, and then converted into NTSC composite video signals by an encoder and monitored. Output to TV18. As a result, a film image can be viewed on the monitor TV 18. Next, the film transport device according to the present invention will be described in detail. This film transport device mainly includes a film supply unit 30 in which a film cartridge 22 is mounted.
And the film 2 supplied from the film supply unit 30
Film take-up section 4 having take-up reel 42 for winding 0
0, a film guide unit 50 for guiding the film 20 between the film supply unit 30 and the film winding unit 40,
Capstan 5 provided in film guide section 50
1 and 52. As shown in FIG. 2, the film supply section 30 includes a motor 31 which can be rotated forward and backward, and a gear 32 with a clutch.
And a gear 33 including a spool drive shaft 33A that fits with the spool 22A of the film cartridge 22 stored in the cartridge storage section 34 (see FIG. 3), so that the spool 22A can be rotated forward and backward. . The gear 32 with the clutch includes a rotating shaft 32B to which the gear 32A is fixed, a gear 32D inserted through the rotating shaft 32B and pressed by a spring 32C, and gears 32A and 32B.
When the gear 32D is rotated clockwise in FIG. 1 by the driving force from the motor 32, the gear 32D rotates. When the gear 32A is completely locked with respect to the shaft 33B, but the rotation speed of the gear 32A is higher than the rotation speed of the gear 32D, the friction clutch operates to operate the gear 3B.
2D is configured to slip with respect to the rotation shaft 32B. The gear 3 including the spool drive shaft 33A
3 can transmit a rotational driving force to the spool drive shaft 33A as shown in FIG.
A is slidably disposed in the axial direction with respect to the gear 33, and is urged by a spring 33B in a direction to be fitted to the spool 22A of the film cartridge 22. Further, a flange-like switch driving member 33C is provided on the spool driving shaft 33A, and a fitting detection switch 35 is provided at a position facing the switch driving member 33C. That is, after the film cartridge 22 is stored in the cartridge storage section 34,
The spool 22A is moved by the lid 34A to the spool drive shaft 33.
When the spool 22A is not fitted to the spool drive shaft 33A, the spool drive shaft 33A is pushed down by the spool 22A against the urging force of the spring 33B. When the spool drive shaft 33A is pushed down, the spool drive shaft 3
The switch driving member 33C is pushed down together with 3A,
The key top of the fitting detection switch 35 is pressed. still,
The fitting detection switch 35 is turned off when the keytop is pressed, and turned on when the keytop is released. The control means (not shown) controls the spool drive by the output from the fitting detection switch 35. It is possible to detect whether or not the shaft 33A and the spool 22A are fitted. As shown in FIG. 1, the film take-up section 40 includes a take-up reel 42, a pressing roller 44 biased by a spring,
The take-up reel 42 is driven in a counterclockwise direction via a gear 46 with a clutch when the film is taken up. Further, the capstans 51 and 52 hold the film 20 between the pinch rollers 53 and 54 and transport the film 20 at a predetermined speed. As shown in FIG. The capstan 51 is connected via a gear 56 with a clutch and a gear 57.
The rotational driving force is transmitted to the motor. In addition, a rotational driving force is also transmitted to the capstan 52 from a driving unit (not shown) in the same manner as described above. Next, the operation of the film transport apparatus having the above-described structure will be described. First, when the film cartridge 22 is mounted on the film supply unit 30, the film loading is started automatically or by a loading instruction. That is, in FIG. 1, the spool 22A and the take-up reel 42 of the film cartridge 22 are rotated counterclockwise, and the capstans 51 and 52 are rotated clockwise. The rotation speed of 33A is switched between two stages as shown in FIGS. FIG. 4 is a flowchart showing the operation of the film supply unit 30 during film loading. As shown in the figure, when the film loading is started, first, the spool drive shaft 33A is rotated at a low speed (step 100). The rotation operation of the spool drive shaft 33A at a low speed is an operation for satisfactorily fitting the spool drive shaft 33A to the spool 22A of the film cartridge 22, and is compared with the rotation speed when the film 20 is fed at the standard speed. And a sufficiently low rotation speed. Then, it is determined whether or not the fitting detection switch 35 is turned on during the low-speed rotation of the spool drive shaft 33A (that is, whether or not the fitting detection switch 35 is turned on).
It is determined whether or not the spool drive shaft 33A has been fitted to the spool 22A (step 102).
5 is turned on, the rotation speed of the spool drive shaft 33A is switched to a high speed so that the film 20 is sent out from the film cartridge 22 at the standard speed (step 10).
4). Thereafter, the film 20 is moved to the capstan 51.
When it is determined by the timer that a sufficient time has passed through (step 106), the motor 31 is stopped to stop the film feeding (step 10).
8). In step 104, the spool drive shaft 33 is moved so that the film 20 is fed at the standard speed.
When A is driven, first, a loosening phenomenon occurs in the film cartridge 22 and the film 20 is sent out from the film cartridge 22. Incidentally, even if the spool 22A is rotated at a constant speed, the film 20 is not removed due to friction or catch in the film cartridge 22.
The sending speed of is unstable. Therefore, the capstan 51 is driven such that the film transport speed is equal to or higher than the maximum instantaneous speed of the film 20 sent out from the film cartridge 22. When the film is sent out and the leader 20B of the film 20 passes through the capstan 51, the main driving source of the film 20 shifts to the capstan 51, and the film sending is stopped as described above. . When the film 20 is pulled out by the capstans 51 and 52 and the film 20 in the film cartridge 22 is tightly wound, the subsequent rotation of the spool drive shaft 33A is absorbed by the gear 32 with the clutch described above. On the other hand, the film 20 conveyed at a predetermined speed by the capstan 51
Thus, the paper is transported at a speed higher than the transport speed by the capstan 51. The speed difference between the capstans 51 and 52 is absorbed by the gear 56 with the clutch. By using the two capstans 51 and 52 in this manner, the flatness of the film 20 can be improved at the image reading position between the capstans 51 and 52. The film 20 conveyed at a predetermined speed by the capstan 52 is sent to the film winding section 40. The take-up reel 42 of the film take-up unit 40 is driven via a clutch-equipped gear 46 so that the take-up speed is faster than the transport speed of the capstan 52. The leader portion 20B of the film 20 is wound by the frictional force with the take-up reel 42, and the speed difference between the winding speed after the winding and the film transport speed is absorbed by the gear 46 with the clutch. FIG. 5 is a flowchart showing another operation of the film supply unit 30 during film loading. As shown in the figure, when the film loading is started, first, the spool drive shaft 33A is rotated at a low speed by a certain angle (step 110). The certain angle is an angle sufficient for fitting the spool drive shaft 33A to the stopped spool 22A, and also depends on the shape of the fitting portion between the spool of the film cartridge and the spool drive shaft. Although it is different, it may be rotated up to 360 ° (180 ° in the case of the shape of this embodiment). Of course, the spool drive shaft must be 3
It may be rotated by 60 ° or more. Subsequent operations are the same as those in the flowchart shown in FIG. 4, and therefore are denoted by the same reference numerals and detailed description thereof will be omitted. Further, in the embodiment shown in FIG. 5, the fitting detection switch 35 shown in FIG. 3 is unnecessary. In this embodiment, when the film is fed at the standard speed for a predetermined time, the feeding of the film is stopped.However, the point at which the leader of the film passes through the capstan 51 is detected by an optical sensor or the like. Alternatively, the delivery of the film may be stopped. Further, the feeding of the film does not need to be stopped. In this case, the speed of film transport at the capstans 51 and 52 is higher than the speed of feeding the film from the film cartridge 22, so that the speed difference is equal to the clutch speed. It is absorbed by the clutch of the gear 32 attached. In this embodiment, the spool drive shaft is rotated at a low speed to engage the spool of the film cartridge. However, the present invention is not limited to this. Alternatively, the drive unit in the film transport device may be prevented from being activated, and a warning that the spool is not fitted may be issued. Further, the present invention can be applied not only to a film scanner but also to a camera or the like. As described above, according to the film transport device of the present invention, when the spool drive shaft is not fitted to the spool of the film cartridge, the drive of the spool drive shaft is prohibited. With this configuration, there is no possibility that the spool drive shaft and the spool will be damaged due to idling without fitting to the spool.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of a film scanner including a film transport device according to the present invention. FIG. 2 is a plan view of a main part of the film transport device shown in FIG. FIG. 3 is a sectional view of an essential part showing a spool of the film cartridge and a gear including a spool drive shaft fitted with the spool. FIG. 4 is a flowchart showing one embodiment of an operation at the time of film loading in the film transport device according to the present invention. FIG. 5 is a flowchart showing another embodiment of the operation at the time of film loading in the film transporting apparatus according to the present invention. FIG. 6 is a view showing an example of a film cartridge used in the film transport device according to the present invention. DESCRIPTION OF SYMBOLS 10 ... Fluorescent lamp 12 ... Photo-taking lens 14 ... CCD line sensor 16 ... Image processing device 20 ... Film 22 ... Film cartridge 22A ... Spool 30 ... Film supply unit 31 ... Motors 32, 32A, 32D, 33 and 46 , 55A, 56, 5
7 Gear 33A Spool drive shaft 33B Spring 33C Switch drive member 34 Cartridge storage unit 35 Fitting detection switch 40 Film take-up unit 42 Take-up reel 44 Pressing roller 50 Film guide units 51 and 52 ... Capstans 53 and 54 ... Pinch roller 55 ... Capstan motor

Claims (1)

(57) Claims 1. A photographic film is wound around a single spool, and a film cartridge containing all the films including a leader portion is used, and the film cartridge is mounted. A film transport device for transporting a film between a film supply unit and a film take-up unit having a take-up reel that takes up a film supplied from the film supply unit, wherein a cartridge storage unit in which the film cartridge is stored A spool drive shaft disposed slidably in the axial direction so as to be fittable with a spool of a film cartridge stored in the cartridge storage portion and spring-biased in a direction to fit the spool; A driving means for applying a rotational driving force to the spool driving shaft ;
At the time of loading, the reader unit is removed from the film cartridge.
Drive to rotate the spool drive shaft in the direction of feeding
Means for detecting whether or not the spool drive shaft has been fitted to the spool of the film cartridge based on an axial sliding position of the spool drive shaft; and Until the combination detecting means detects the engagement between the spool drive shaft and the spool of the film cartridge, the drive means sends out the leader portion from the film cartridge.
And a control means for disabling the operation.