JPS63313139A - Film driving controller - Google Patents

Abstract

PURPOSE:To surely stop the feeding action of a film at a terminal position even if the inner diameter of a reel is different by detecting the alteration of the inner diameter of the supply reel and variably controlling the terminal position of the film. CONSTITUTION:When a capstan 3 is rotated by driving a motor 5, an encoder 11 is rotated and a light receiving element 13 outputs a signal according to the rotating speed of the capstan 3. Meanwhile, a rolled film 2 is fed out and the supply reel 1 and an encoder 8 are simultaneously rotated, and then a light receiving element 10 outputs a signal according to the rotating speed of the reel 1. By counting the AND between the output signals from the elements 10 and 13 and a reference clock signal, the diameter, the thickness and the number of rolls of the film 2 can be decided. Then, the length of the film can be discriminated just in a time when the encoders 8 and 11 output one pulse, and the film 2 can be surely stopped, leaving a specified remaining quantity.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a film drive control device that can be applied to rotary cameras, microfilm retrieval devices, etc., and in particular uses supply reels each having a different inner diameter of the reel portion. The present invention relates to a film drive control device capable of controlling a film drive control device.

(Prior Art) In a film drive control device that controls operations such as winding up and returning a8' of a roll film, kI! in the feeding direction of the roll film is used. Detecting the end position and stopping the roll film feeding operation is considered to be an important control function.

Regardless of whether each frame of the roll film is searched automatically or visually, if the roll film is fed by a drive device such as a motor, this is due to user carelessness. This is because the roll film may be fed to the end due to an erroneous operation or the like. Especially in the case of a type where the end of the roll film is fixed to the reel rotating shaft, such excessive conveyance can cause accidents such as damage to the roll film or drive system and overheating of the motor. .

To solve this problem, conventionally, Japanese Patent Application Laid-Open No. 57-1771
There is one as disclosed in Publication No. 35. In such a conventional example, the rotation of the supply reel shaft is detected, the period required for the supply reel shaft to rotate a predetermined number of rotations or a predetermined rotation angle is determined, and an encoder plate is used to adjust the film to a constant moving length. By generating pulses synchronously, counting the pulses generated within a specified period of time on the supply reel shaft, and controlling the drive of the roll film based on this count, there is no need to make special marks on the roll film. The roll film was also stopped at the end position.

(Problems to be Solved by the Invention) Incidentally, roll films may be used in the same film feeding device even if they have different shapes. In such a case, the inner diameters of the reel portions will be different.

Therefore, when trying to detect the film end position with the conventional film drive control device, the conventional example detects the film end position assuming that the inner diameter of the reel around which the film is wound is constant. It is impossible for the film end detection function to work properly for reel parts with different inner diameters. As a result, there are problems with caps where the film is mistakenly judged to be at the end even when it is in the middle of the film and is stopped, or where the film continues to be fed at high speed without being able to detect the end position of the film, causing damage to the film. there were.

Therefore, the present invention has been made to solve the above-mentioned problems of the conventional example, and its purpose is to accurately detect the film end position even if the inner diameter of the reel portion of the supply reel changes. The object of the present invention is to provide a film drive control device that can perform the following functions.

(Means for Solving the Problems) In order to achieve the above object, one aspect of the present invention provides a device for winding up a film wound around a supply reel by rotationally driving a take-up reel. an inner diameter detection means for detecting a change in the inner diameter of the reel portion; a termination detection means for detecting a termination position of the film; and a film termination position detected by the termination detection means based on a detection result of the inner diameter detection means. and a control means for variably controlling.

(Function) In the present invention having the above configuration, the change in the inner diameter of the reel portion of the supply reel is detected by the inner diameter detection means, and the film end position detected by the end detection means is varied based on the detection result. By controlling the film, the end position of the film can be reliably detected even if the inner diameter of the reel part changes.

(Example) The present invention will be explained below based on the illustrated example. Second
4 to 4 show an example for detecting the film end position in an embodiment of the film drive control device according to the present invention, and FIG. 2 shows an example in which the embodiment is applied to a rotary camera. In the figure, 1 is a supply reel whose reel diameter is cil, 2 is a roll film wound around the supply reel 1, and 3 is a capstan for feeding the roll film 2, whose diameter is d2. shall be. Reference numeral 4 denotes a presser roller paired with the capstan 3, 5 a motor for driving the capstan 3, 6 a take-up reel, 7 a motor for driving the take-up reel 6, and 8 a supply reel l. The encoder 9.10 as a first pulse generating means is integrally attached to the reel shaft, and numerals 9 and 10 are a light emitting element and a light receiving element, respectively, and are disposed at opposite positions with the encoder 8 interposed therebetween. Reference numeral 11 is an encoder as a second pulse generating means that is integrally attached to the shaft of the capstan 3, and 12 and 13 are a light-emitting element and a light-receiving element, respectively, which are disposed at opposite positions with the encoder 11 in between.

By driving the motors 5 and 7, the roll film 2 on the supply reel 1 is wound onto the take-up reel 6.

FIG. 3 is a block diagram for detecting the film end position of this embodiment. In the same figure, 14 is a reference clock generation circuit, 15 is an AND circuit, and during the "H" pulse of the light receiving element 10, The clock from the reference clock generation circuit 14 is output to a counter to be described later. 16 is an AND circuit which outputs the clock from the reference clock generation circuit 14 to a counter to be described later during the H'' period of the pulse of the light receiving element 13. 17 is a counter as a measuring means for counting the output of the AND circuit 15; is a counter as a measuring means for counting the output of the AND circuit 16. Also, 19 is a control means, which controls the drive of the roll film 2 by comparing the time intervals measured by the counters 18 and 19 and their changes. That is, by controlling the motor drive circuit 20 by the control means 19, driving and stopping of the motor 7 is controlled.

In the above configuration, when the motor 5 is driven to rotate the capstan 3 in order to send out the roll film 2, the encoder 11 also rotates at the same time, and the output waveform from the light receiving element 13 as shown in FIG. 4(b) is generated. can get. This signal and the reference signal (fourth clock signal) from the reference clock signal generation circuit 14
When logically multiplied with (a) in Fig. 4, the signal shown in Fig. 4 (c) is obtained, and when this signal is sent to the counter 18, the number of counts becomes a value T2 proportional to the time of one pulse of the encoder 11. Further, when the roll film 2 is fed out, the supply reel 1 also rotates at the same time, and the encoder 8 rotates. As a result, the count number of the counter 17 becomes the value TI proportional to the time of one pulse of the encoder 8, as described above. The relationship between the diameter d3 of the roll film 2 and the diameter d2 of the capstan 3 is T+, assuming that the number of pulses per revolution of the encoders 8 and 11 is equal.
/T2=dx/d2. Here, “r+, T2
.

Since dz is known as P, the diameter d3 of the roll film 2 is
becomes d3=d2 XTI /T2. Note that the accuracy of the count values TI and T2 is determined by the reference clock signal generation circuit 14.
It is possible to improve this by setting the frequency of the reference clock sent from the source sufficiently high. If the thickness of the roll film 2 is t, the diameter d3 of the roll film 2 is
will decrease by 2. In other words, roll film 2
By knowing the diameter d3 of the roll film 2 with high accuracy, the thickness t of the roll film 2 can also be known.

Next, the roll film 2 wound on the supply reel l
When determining the relationship between Wan, the diameter d3 of the roll film 2, and the thickness t of the roll film 2, the length of one round of the nth film 2 on the supply reel l (reel diameter d+) is 1n.
Since the thickness of film 2 is t, in=(dl
+ (2n-1)t)π. Moreover, since the diameter of the roll film 2 is d3, when in is calculated from this, In=d:+π. These two formulas?

As a result, if the number of turns n and the thickness t of the roll film 2 are known, the length of the roll film 2 wound around the supply reel l can be determined.

Therefore, the number of turns n of the roll film 2 wound around the supply reel l can be accurately known just by the time the encoders 8 and 11 output one pulse, and the thickness t of the film can also be detected. The film 2 can be reliably stopped at a predetermined remaining amount. As a result, the amount of film for preventing exposure can be left as small as possible, and the efficiency of film usage can be improved. On the other hand, the diameter d3 of the wound roll film 2 and the diameter d of the capstan 3
When the time when l becomes equal is detected, the end of the roll film 2 can be detected.

Thereby, the remaining amount of the roll film 2 and the feeding amount can be accurately detected.

This embodiment includes the structure shown in FIG. 1 in addition to the film end detection means having the above structure. That is, supply reel l
By detecting changes in the reel diameter (inner diameter) d+ and changing the reel diameter d1 in the above formula in = (dl + (2n-1)t)π accordingly, the end position of all roll films can be ensured. to be detected. In Figure 1,
Reference numeral 3o denotes a detector for detecting the reel diameter d1 of the supply reel I, which is automatically determined by the detector 30 when the cartridge is attached, for example, by utilizing the difference in the external shape of the cartridge for housing the supply reel I.

In addition, 31 is a keyboard, supply reel l, glue diameter d
1 is key human power. 32 is a memory, and the reel diameter d1 is determined according to the type of the supply reel L, for example, the cartridge type has a reel inner diameter of 30 mm, and the type ■ has a reel inner diameter of 34 mm.
m, etc. 33 is C as a control means
The PU terminates the inner diameter data for calculation so as to change the film end position detected by the film end position detection means 40 based on the detection result of the detector 30 or the input result of the reel diameter dl on the keyboard 31. The signal is sent to the blue detection means 40 for control.

In the above embodiment, the film end position is detected in a rotary camera, but the present invention can also be applied to, for example, a microfilm retrieval device. When applied to this search device, the difference in the external shape of the cartridge or the like may be entered using the keyboard 31 when setting the film search mode.

Further, in the above embodiment, the capstan is driven in order to accurately feed the film in a rotary camera, but in a search device or the like, it is only necessary to rotate the take-up reel.

(Effects of the Invention) The film drive control device according to the present invention has the above configuration and operation, and even if the inner diameter of the reel portion of the supply reel differs, the end position of the film can be accurately detected accordingly. As a result, there is no need to stop the film midway due to a misjudgment that it is the end, and the film can be prevented from being damaged.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a film drive control device according to the present invention, FIG. 2 is a schematic perspective view showing an example in which the embodiment is applied to a rotary camera, and FIG. Block diagram of end detection means, FIG. 4(a)
, (b) and (C) are output waveform diagrams of each part in FIG. 3. Explanation of symbols l... Supply reel 2... Roll film 6
...Take-up reel 30...Detector (inner diameter detection means) 31...Keyboard 33...CPU (control means) 40...Film end position detection means Patent applicant Canon Co., Ltd. - Agent Patent attorney Kazunobu Sera 5-Agent Patent attorney Oku 1) Regulations ~ Figure 1 Figure 2 Figure 3 Figure 4 Procedure amendment 2. Name of the invention Film familiarization control device Representative Kaku RLJ2rS 6, Subject of correction - (1) Drawings

Claims (1)

[Claims] In a device for winding a film wound around a supply reel by rotationally driving a take-up reel, an inner diameter detection means detects a change in the inner diameter of a reel portion of the supply reel, and an end detection means detects a terminal end position of the film. and a control means for variably controlling the film end position detected by the end edge detection means based on the detection result of the inner diameter detection means.