JP3690521B2 - Film transport device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film transport apparatus, and more particularly to a film transport apparatus applied to a camera, a film scanner, or the like that uses a film cartridge in which a photographic film is wound around a single spool.
[0002]
[Prior art]
This type of conventional film transport apparatus has a so-called film loading function in which when a film cartridge is mounted at a predetermined position, the film is electrically pulled out from the film cartridge, and the film leader is wound around a take-up reel. There is something. (Patent Documents 1 and 2).
[0003]
In the film transport device described in Patent Document 1, the sprocket and the take-up reel that are engaged with the film perforation are simultaneously driven at the initial stage of film loading, and only the take-up reel is driven at the end of loading. In addition, it is detected whether the film is satisfactorily wound on the take-up reel from the film feed amount at the end of loading.
[0004]
On the other hand, in the conventional film cartridge, the leader portion before use of the film is exposed from the film cartridge. However, in recent years, all films including the leader portion are stored in the film cartridge regardless of before and after use, and the leader portion is What is not exposed is proposed. This type of film cartridge is configured such that the film stored in the cartridge is sent out by rotating the spool of the cartridge.
[0005]
The film transport device described in Patent Document 2 detects the film moving speed when performing film loading using the film cartridge, and determines whether the film is wound around the take-up reel from the change in the moving speed. I try to detect it.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 62-172332 [0007]
[Patent Document 2]
Japanese Patent Laid-Open No. 3-167537
[Problems to be solved by the invention]
By the way, the reason why the film cannot be satisfactorily wound around the take-up reel during film loading is that the spool drive shaft does not mesh with the spool of the film cartridge, so that the film cannot be fed out from the film cartridge.
[0009]
The present invention has been made in view of such circumstances, and can automatically load a film even if the leader portion is not exposed from the film cartridge. Particularly, the spool of the film cartridge and the spool drive shaft are fitted to each other. It is an object of the present invention to provide a film transport apparatus that can reliably perform the feeding of the film from the film cartridge.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 uses a film cartridge in which a photographic film is wound around a single spool and contains all the films including the leader portion, and the film cartridge is mounted. In the film transport apparatus for transporting the film between the film supply section and the film take-up section having a take-up reel that winds up the film supplied from the film supply section, the cartridge storage in which the film cartridge is stored A spool drive shaft that is slidably disposed in the axial direction so as to be slidable in the axial direction and is urged by a spring in a direction to be engaged with the spool, and a spool of the film cartridge stored in the cartridge storage unit. A driving means for applying a rotational driving force to the spool driving shaft, wherein A driving means for rotating the spool drive shaft from Ilm cartridge in a direction to feed the reader unit, the film supply unit having,
Control means for controlling the drive means so as to drive the spool drive shaft at a speed lower than a standard film transport speed during a predetermined period when the spool drive shaft is fitted to the spool of the film cartridge. It is a feature.
[0011]
According to the first aspect of the present invention, the spool drive shaft is driven at a speed lower than the standard film transport speed during a predetermined period in which the spool drive shaft is fitted to the spool of the film cartridge, for example, during one rotation of the spool drive shaft. This ensures that the spool drive shaft can be fitted into the spool. If the spool drive shaft is driven so that the spool drive shaft is at a standard film transport speed when the spool drive shaft and the spool are not fitted, the spool drive shaft may idle without being fitted to the spool. Has the problem of damaging the spool drive shaft and spool.
[0012]
The invention according to claim 2 uses a film cartridge in which a photographic film is wound around a single spool and contains all the films including the leader portion, and the film supply section to which the film cartridge is mounted; In the film transport apparatus for transporting the film to and from a film take-up unit having a take-up reel for taking up the film supplied from the film supply unit, a cartridge storage unit for storing the film cartridge, and the cartridge storage unit A spool drive shaft that is slidably disposed in the axial direction so as to be slidable in the spool of the film cartridge housed in the spool, and is spring-biased in a direction to be engaged with the spool, and is rotationally driven by the spool drive shaft Drive means for applying force from the film cartridge during film loading; A driving means for rotating the spool drive shaft in a direction to feed out the reader portion; and the spool drive shaft is fitted to the spool of the film cartridge from the axial slide position of the spool drive shaft. A fitting detecting means for detecting whether or not the fitting is detected, and a period until the fitting detecting means detects the fitting between the spool driving shaft and the spool of the film cartridge. And a control means for controlling the drive means so as to drive at low speed.
[0013]
According to the second aspect of the present invention, the spool driving shaft is driven at a speed lower than the standard film transport speed until the fitting detecting means detects the fitting between the spool driving shaft and the spool. The spool drive shaft is securely fitted to the spool to perform desired film conveyance.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a film transport apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.
[0015]
FIG. 1 is a block diagram showing an embodiment of a film scanner including a film transport device according to the present invention.
[0016]
As shown in the figure, the film scanner mainly includes a fluorescent lamp 10 for illumination, an imaging lens 12, a CCD line sensor 14, an image processing device 16 including an image memory (not shown), and the film transport according to the present invention. It consists of devices.
[0017]
The developed photographic film 20 used in this film scanner has, for example, a perforation 20A perforated at the front end of one frame as shown in FIG. 6, and is entirely contained in a film cartridge 22 having a single spool 22A. It is designed to be wound up. Further, the perforation is not perforated 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.
[0018]
In FIG. 1, the fluorescent lamp 10 is arranged so that its longitudinal direction is perpendicular to the transport direction of the film 20, and can be illuminated over the entire width of the film 20. The transmitted light that has passed through the film 20 is imaged on the light receiving surface of the CCD line sensor 14 disposed in the direction orthogonal to the film transport direction via the photographing lens 12. When reading a film image, the film 20 is conveyed at a constant speed as will be described later.
[0019]
The image light imaged on the light receiving surface of the CCD line sensor 14 is accumulated in charge by each sensor provided with an R, G, B filter, and R, G, B signals corresponding to the intensity of the light. Converted to electric charge. The R, G, and B signal charges accumulated in this way are read to the shift register by a transfer gate pulse applied from a CCD drive circuit (not shown), and sequentially read by the register transfer pulse.
[0020]
The R, G, B signals for one frame read from the CCD line sensor 14 at the time of reading the film image are output to the image processing device 16. The image processing apparatus converts an input R, G, B signal for one frame into a digital signal by an A / D converter (not shown), performs necessary signal processing, and then stores it in an image memory. The R, G, B signals for one frame stored in the image memory are repeatedly read out and converted into analog signals by a D / A converter, and then converted into an NTSC composite video signal by an encoder and monitored. It is output to the TV 18. As a result, the film image can be viewed on the monitor TV 18.
[0021]
Next, the film transport apparatus according to the present invention will be described in detail.
[0022]
The film transporting apparatus includes a film supply unit 30 to which a film cartridge 22 is mainly mounted, a film take-up unit 40 having a take-up reel 42 for taking up the film 20 supplied from the film supply unit 30, and a film supply unit. 30, a film guide portion 50 for guiding the film 20 between the film take-up portions 40, and capstans 51 and 52 disposed in the film guide portion 50.
[0023]
As shown in FIG. 2, the film supply unit 30 is engaged with a motor 31 capable of rotating forward and backward, a gear 32 with a clutch, and a spool 22A of the film cartridge 22 stored in the cartridge storage unit 34 (see FIG. 3). And a gear 33 including a spool drive shaft 33A, and 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, a felt interposed between the gears 32A and 32D, and the like. When the gear 32D is rotated clockwise in FIG. 1 by the driving force from the motor 32, the gear 32D is completely locked with respect to the rotating shaft 32B. However, when the rotational speed of the gear 32A is higher than the rotational speed of the gear 32D, the friction clutch acts and the gear 32D slips with respect to the rotational shaft 32B.
[0024]
Further, the gear 33 including the spool drive shaft 33A can transmit the rotational drive force to the spool drive shaft 33A as shown in FIG. 3, while the spool drive shaft 33A is slidable in the axial direction with respect to the gear 33. And is biased by a spring 33B in a direction to fit with the spool 22A of the film cartridge 22.
[0025]
Further, the spool drive shaft 33A is provided with a flange-like switch drive member 33C, and a fitting detection switch 35 is disposed at a position facing the switch drive member 33C. That is, the film cartridge 22 is stored in the cartridge storage portion 34 and then pressed by the lid 34A so that the spool 22A is fitted to the spool drive shaft 33A, but the spool 22A is not fitted to the spool drive shaft 33A. The spool drive shaft 33A is pushed down against the biasing force of the spring 33B by the spool 22A. When the spool drive shaft 33A is pushed down, the switch drive member 33C is pushed down together with the spool drive shaft 33A, and the key top of the fitting detection switch 35 is pushed down. The fitting detection switch 35 is turned off when the key top is pressed, and turned on when the key top is released. The control means (not shown) is controlled by the output from the fitting detection switch 35. Whether or not the spool drive shaft 33A and the spool 22A are fitted can be detected.
[0026]
As shown in FIG. 1, the film take-up section 40 has a take-up reel 42, spring-pressed press rollers 44, 44, etc., and the take-up reel 42 has a gear 46 with a clutch when the film is taken up. Is driven in the counterclockwise direction.
[0027]
Further, the capstans 51 and 52 convey the film 20 at a predetermined speed with the film 20 sandwiched between the pinch rollers 53 and 54. As shown in FIG. A rotational driving force is transmitted to the capstan 51 through a gear 56 with a clutch and a gear 57. Note that a rotational driving force is transmitted to the capstan 52 from driving means (not shown) in the same manner as described above.
[0028]
Next, the operation of the film transport apparatus having the above configuration will be described.
[0029]
First, when the film cartridge 22 is loaded into the film supply unit 30, film loading is started automatically or according to 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, but the spool drive shaft that drives the spool 22A. As for 33A, as shown in FIG.4 and FIG.5, a rotational speed is switched to two steps.
[0030]
FIG. 4 is a flowchart showing the operation of the film supply unit 30 during film loading. As shown in the figure, when film loading is started, the spool drive shaft 33A is first rotated at a low speed (step 100). Note that the rotation operation of the spool drive shaft 33A at a low speed is an operation for favorably 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 out at the standard speed. The rotation speed is sufficiently slow.
[0031]
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 spool drive shaft 33A is fitted to the spool 22A) (step 102). When the combination detection switch 35 is turned on, the rotational 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 a standard speed (step 104).
[0032]
Thereafter, when it is measured by a timer that a sufficient time has passed for the film 20 to pass through the capstan 51 (step 106), the motor 31 is stopped and the delivery of the film is stopped (step 108).
[0033]
By the way, when the spool drive shaft 33A is driven so that the film 20 is sent out at the standard speed in Step 104, first, a phenomenon of winding looseness occurs in the film cartridge 22, and the film 20 is sent out from the film cartridge 22. come. Even if the spool 22A is rotated at a constant speed, the feeding speed of the film 20 becomes unstable due to friction, catching, etc. in the film cartridge 22. 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.
[0034]
When the film is fed out and the leader portion 20B of the film 20 passes through the capstan 51, the main drive source of the film 20 shifts to the capstan 51, so that the film feeding is stopped as described above.
[0035]
When the film 20 is pulled out by the capstans 51 and 52 and the film 20 in the film cartridge 22 is wound, the subsequent rotation of the spool drive shaft 33A is absorbed by the gear 32 with a clutch described above.
[0036]
On the other hand, the film 20 conveyed at a predetermined speed by the capstan 51 is further conveyed by the capstan 52 at a speed higher than the conveying speed by the capstan 51. The speed difference between the capstans 51 and 52 is absorbed by the gear 56 with a clutch. By using the two capstans 51 and 52 in this way, the flatness of the film 20 can be improved at the image reading position between the capstans 51 and 52.
[0037]
The film 20 conveyed at a predetermined speed by the capstan 52 is sent to the film winding unit 40. The take-up reel 42 of the film take-up unit 40 is driven via a gear 46 with a clutch so that the take-up speed is higher than the transfer speed by the capstan 52. The leader 20B of the film 20 is wound by the frictional force with the take-up reel 42, and the speed difference between the take-up speed after the end of winding and the film transport speed is absorbed by the gear 46 with a clutch.
[0038]
FIG. 5 is a flowchart showing another operation of the film supply unit 30 during film loading. As shown in the figure, when film loading is started, the spool drive shaft 33A is first rotated at a constant angle at a low speed (step 110). The above-mentioned fixed angle is an angle sufficient for fitting the spool drive shaft 33A to the stopped spool 22A, and depending 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 may be rotated 360 ° or more in order to ensure the fitting.
[0039]
Since the subsequent operation is the same as that in the flowchart shown in FIG. 4, the same reference numerals are given, and detailed description thereof is omitted. Further, in the embodiment shown in FIG. 5, the fitting detection switch 35 shown in FIG. 3 is unnecessary.
[0040]
In this embodiment, when the film is fed at a standard speed for a predetermined time, the feeding of the film is stopped. However, when the film leader passes the capstan 51, it is detected by an optical sensor or the like. The film feeding may be stopped. Furthermore, the film feeding does not have to be stopped. In this case, the film transport speed in the capstans 51 and 52 is faster than the feeding speed from the film cartridge 22, so that the speed difference is determined by the clutch difference. It is absorbed by the clutch of the attached gear 32.
[0041]
In this embodiment, the spool drive shaft is rotated at a low speed so as to be fitted to the spool of the film cartridge. However, the present invention is not limited to this, and when the fitting is not detected by the fitting detection switch, the film is conveyed. The drive means in the apparatus may be prevented from being activated and a warning may be given that the spool is not engaged.
[0042]
Furthermore, the present invention can be applied not only to a film scanner but also to a camera or the like.
[0043]
【The invention's effect】
As described above, according to the film transport apparatus of the present invention, the spool drive shaft is driven at a speed lower than the standard film transport speed for a predetermined period so that the spool drive shaft is fitted to the spool of the film cartridge. Therefore, the spool drive shaft can be securely fitted to the spool. According to another aspect of the present invention, the spool drive shaft is driven at a speed lower than the standard film transport speed until the engagement between the spool drive shaft and the spool is detected. Can be securely fitted to the spool to carry out a desired film conveyance.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a film scanner including a film transport device according to the present invention.
FIG. 2 is a plan view of the main part of the film transport apparatus shown in FIG.
FIG. 3 is a cross-sectional view of an essential part showing a spool including a spool of a film cartridge and a gear including a spool drive shaft fitted to the spool.
FIG. 4 is a flowchart showing an embodiment of an operation during film loading in the film transport apparatus according to the present invention.
FIG. 5 is a flowchart showing another embodiment of the operation during film loading in the film transport apparatus according to the present invention.
FIG. 6 is a view showing an example of a film cartridge used in the film transport apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Fluorescent lamp, 12 ... Shooting lens, 14 ... CCD line sensor, 16 ... Image processing apparatus, 20 ... Film, 22 ... Film cartridge, 22A ... Spool, 30 ... Film supply part, 31 ... Motor, 32, 32A, 32D 33, 46, 55A, 56, 57 ... gear, 33A ... spool drive shaft, 33B ... spring, 33C ... switch drive member, 34 ... cartridge storage part, 35 ... fitting detection switch, 40 ... film take-up part, 42 ... take-up reel, 44 ... presser roller, 50 ... film guide section, 51, 52 ... capstan, 53, 54 ... pinch roller, 55 ... capstan motor

Claims (2)

Using a film cartridge in which a photographic film is wound on a single spool and containing all the films including the leader portion, a film supply portion to which the film cartridge is mounted, and a film supplied from the film supply portion In the film transport apparatus for transporting the film to and from the film winder having a take-up reel
A cartridge storage portion for storing the film cartridge and a spool of the film cartridge stored in the cartridge storage portion so as to be slidable in the axial direction and provided with a spring in a direction to be engaged with the spool. A biased spool drive shaft and drive means for applying a rotational driving force to the spool drive shaft, the drive means rotating the spool drive shaft in a direction of feeding the leader portion from the film cartridge during film loading. Having the film supply section;
Control means for controlling the drive means so as to drive the spool drive shaft at a speed lower than a standard film transport speed during a predetermined period when the spool drive shaft is fitted to the spool of the film cartridge;
A film transport device comprising: Using a film cartridge in which a photographic film is wound on a single spool and containing all the films including the leader portion, a film supply portion to which the film cartridge is mounted, and a film supplied from the film supply portion In the film transport apparatus for transporting the film to and from the film winder having a take-up reel
A cartridge storage portion for storing the film cartridge and a spool of the film cartridge stored in the cartridge storage portion so as to be slidable in the axial direction and provided with a spring in a direction to be engaged with the spool. A biased spool drive shaft and drive means for applying a rotational driving force to the spool drive shaft, the drive means rotating the spool drive shaft in a direction of feeding the leader portion from the film cartridge during film loading. Having the film supply section;
A fitting detecting means for detecting whether or not the spool driving shaft is fitted with a spool of the film cartridge from an axial slide position of the spool driving shaft;
The drive means is controlled to drive the spool drive shaft at a speed lower than the standard film transport speed until the fitting detection means detects the fit between the spool drive shaft and the spool of the film cartridge. Control means;
A film transport device comprising:

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