JPH0296124A - Film conveying device - Google Patents

Abstract

PURPOSE:To eliminate film rewinding leader tape biting between the flanges of a rewinding reel by temporarily stopping rewinding a film and rewinding the film in a low speed after a definite time if it is detected that the leader tape becomes closer to the rewinding reel at rewinding the film. CONSTITUTION:A detecting means which detects the leader tape F' of the film F at rewinding a film is set in a conveying path 11. Then, a control circuit 26 which incorporates a timer which receives a detecting signal, sends a stopping signal to a rewinding motor 20 and sends a low-speed rewinding signal to the rewinding motor 20 after a definite time after sending the stopping signal is provided. Then, after the leader tape F' is made to ride on the flange periphery of the rewinding reel 4 at rewinding the film F, rewinding is temporarily stopped and restarted in a low speed after a definite time. Thus, the leader tape F' of the film F can be smoothly rewound without biting between the flanges.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a film transport device that automatically transports a long film wound on a rewind reel in a cartridge and winds it onto a take-up reel. It is something.

(Prior Art) Conventionally, as shown in FIG. 7, a long film F wound on a rewind reel 51 in a cartridge 50 is transferred to a take-up reel 53 via a conveyance path such as a guide roller 52. After winding, the light source 54. There is a device that searches for film frames using an optical system composed of lenses 55°, 56, and the like.

FIG. 8 shows a cartridge 50 used in the film frame retrieval device as described above. A notch 58 is provided on the upper side surface of the film outlet 57 of the cartridge 5o, and a roller 5 rotated by a motor (not shown) is inserted into the notch 58.
9, the roller 59 is brought into pressure contact with the outer peripheral surface of the flange 6o of the rewind reel 51, and is brought into contact with the wide leader tape F' to feed out the film F.

However, when the film frame search is completed and the film F is being rewound onto the rewind reel 51, the load on the winding side (
The film F is pulled in the direction of the take-up reel 53 due to the load on the take-up reel, motor, etc., and as shown in FIG. 60 deforms and becomes cartridge 5
There were cases where the rewind reel 51 stopped rotating because it was pressed against the side wall of the 0.

In order to solve the above problem, as shown in FIG. 7, a detection means When this is detected, the rewind motor (not shown) that drives the rewind reel 51 is decelerated for a certain period of time to slacken the film F and make it easy for the leader tape F' to ride on the outer peripheral surface of the flange 60. A means for rewinding the film F by returning the rotation speed of the rewind reel 51 to the normal speed has been adopted.

(Problem to be Solved by the Invention) However, even if the film F is once slackened as described above, when the rewind reel 51 returns to the normal rotational speed, the tension of the film F increases rapidly. Leader tape F is about to ride on the outer circumferential surface of
′ ended up being pulled in the same direction as described above and digging in, so this could not be said to be an effective solution for preventing digging in.

This invention is intended to solve the above problem,
- It is an object of the present invention to provide a film transport device in which a film rewinding leader tape does not become wedged between the flanges of a rewinding reel after the leading end of the leader tape rides on the outer peripheral surface of a flange of a rewinding reel.

(Means for Solving the Problem) A long film wound on a rewind reel is wound on a take-up reel via a conveyance path, and the take-up reel or rewind reel is connected to a take-up motor and a rewind motor, respectively. In a film conveyance device that is rotated by a motor to wind and unwind the film, the conveyance path includes a detection means for detecting a leader tape of the film and transmitting a detection signal when the film is being rewound; and a control circuit incorporating a timer that transmits a stop signal to the rewind motor upon receiving the stop signal, and transmits a low speed rewind signal to the rewind motor after a certain period of time after the transmission of the stop signal. It is something.

(Function) The function of the present invention based on the above configuration is that when it is detected that the leader tape approaches the rewind reel during film rewinding, the rewinding of the film is temporarily stopped, and after a certain period of time, the film is rewound at a low speed. .

(Example) Next, the present invention will be described based on an example shown in FIGS. 1 to 6.

In the figure, reference numeral 1 denotes a cartridge, and an opening 2 is provided at the upper corner of the cartridge 1.
- An outlet 3 is provided on the side. 4 is a rewind reel housed in the cartridge 1, and a long film F is wound on the rewind reel 4.

Reference numeral 5 denotes a film feeding mechanism, and the feeding mechanism 5 is composed of a motor 6 and a feeding roller 8 connected to the motor 6 via a rotating shaft 7. The feed roller 8 is inserted into the cartridge 1 through the opening 2 and is in pressure contact with the flange 9 of the rewind reel 4. Therefore, when the motor 6 is rotated in the direction of the arrow C, the rewind reel 4 is rotated in the direction of the arrow C, and the film F is sent out from the delivery port 3.

The motor 6 and the feed roller 8 are operated only when feeding the film F, and are moved in the horizontal direction by means not shown, so that the feed roller 8 can be pressed against and separated from the flange 9. There is.

1o is a rewind motor, and the rotation shaft 10' of the rewind motor 10 is
is connected to the rewind reel 4, and when rotated in the direction of arrow E, the film F can be rewound onto the rewind reel 4.

Reference numeral 11 denotes a conveyance path for conveying the film F sent out from the cartridge 1 to a take-up reel, which will be described later. The conveyance path 11 is composed of a guide roller 12 and a guide plate 13.

14 is a film search means provided in the transport path 11;
The film search means 14 includes a light source 15 and lenses 16 and 17.
and a reflecting mirror 18, the lens 16 collects the light emitted from the light source 15 and irradiates each frame of the film F, the image is magnified by the lens 17, and is reflected through the reflecting mirror 18. It can be projected onto a display.

Reference numeral 19 denotes a take-up reel, to which a rotating shaft 21 of a take-up motor 20 is connected, and by rotating in the direction of arrow G, the film F transported through the transport path 11 is
can be wound up.

22 is a detection means provided in the conveyance path 11, and the detection means 2
2 is the leader tape F of the film F that passes during rewinding.
' is used to detect the signal and send a detection signal to a control circuit, which will be described later. As shown in FIG. 2(a), this detection means 22 includes a photo interrupter 23 and a sensor arm 24.
It is composed of. This sensor arm 24 has a shaft 25
, a contact piece 25 a extending in the lateral direction of the shaft 25 , and a blocking piece 25 b that blocks the light beam 23 ′ of the photo ink converter 23 .
It is composed of. In normal times, as shown in FIG. 2(b), the light beam 23' is in a communicating state, and when the film F is conveyed and the contact piece 25a rides on the tape F' as shown in FIG. 2(c), , rotates in the direction of the arrow about the shaft 25, the blocking piece 25b blocks the light beam 23' of the photo ink clubter 23, and sends a detection signal R3 to the control circuit.

26 is a control circuit, and the control circuit 26 is connected to the winding motor 20,
It is connected to the rewind motor 10 and the detection means 20, respectively. The control circuit 26 is operated by an operation section (not shown), and when a drive signal FF is sent from the control circuit 26, the rotating shaft 21 of the winding motor 20 rotates in the direction of arrow G to wind the film F. When the drive signal REW is transmitted, the rotating shaft 10' of the rewinding motor 10 rotates in the direction of arrow C, and the film F is rewound. In addition, the control circuit 2
When the stop signals REW and FF are transmitted from 6, the rewind motor 10 and the take-up motor 20 are decelerated and then stopped.

T is a timer built into the control circuit 26, and after the timer T sends the stop signal REW to the rewind motor 10,
It is comprised of a timer T1 that causes the rewind motor 10 to transmit a low-speed rewinding signal REW' after a certain period of time, and a timer T2 that turns off the low-speed rewinding signal REW' after that certain period of time.

Therefore, when the rewind motor 10 receives the stop signal REW sent from the control circuit 26, it decelerates and then stops.
Low-speed rewind signal REW' transmitted by timer T activation
It receives this and rotates at low speed.

Next, the operation of the present invention will be explained based on the flowchart shown in FIG.

First, after the frame search for a predetermined film F is completed, when the control circuit 26 transmits a drive signal REW by operating an operation section (not shown) (step 2), the rewind motor 10 rotates in the direction of arrow C to rewind the film. Rewinding of the film F on the reel 4 is started. Then, as the leader tape F' approaches the detection means 22 as shown in FIG. 2(b), the leader tape F' approaches the detection means 22 as shown in FIG.
When the contact piece 25a rides on the leader tape F' as shown in FIG.

The control circuit 26 that has received the detection signal R3 outputs the drive signal RE.
W is turned off and a stop signal REW is sent to the rewind motor 10 (step 2), a timer T is set, and rewinding by the rewind reel 4 is temporarily stopped.

Then, the film F becomes slightly slack due to inertia and rotation of the take-up reel 19. Then, after a certain period of time has elapsed, the timer T1 is turned off (step ■), the control circuit 26 transmits a low-speed rewinding signal REW', and the rewinding motor 10 receiving this signal resumes rewinding at a low speed (step ■). After that, timer T2 is turned on.

Therefore, the leader tape F' of the film F being rewound on the rewind reel 4 is rewound while riding on the outer peripheral surface of the flange 9 when it becomes slack, and after a certain period of time, the leader tape F' of the film F is rewound.
2 is 0FFu (step ■), stop signals REW and FF are sent from the control circuit 26 (step 8), and the rewinding is completed.

In the above embodiment, the timer T built in the control circuit 26 receives the detection signal R3, sends the stop signal REW only to the rewind motor 10, and after a certain period of time sends the low speed rewind signal REW'. However, if the upper rewind motor drive signal REW is transmitted for a certain period of time after the low-speed rewind signal REW' is transmitted, and the rewind reel 4 is returned to the normal rotational speed, the rewind can be performed. It can save time. The operation in this case will be explained with reference to the flowchart shown in FIG. Step (2) is reached through the same operation as in the above-mentioned embodiment, and when the timer T2 is turned off after a certain period of time (step (2)), the low speed rewind signal REW' is turned off and a step is taken to send the drive signal REW to the rewind motor 10. ■), rewinding is performed at the normal rotation speed, and the timer T2 is turned on again, and after a certain period of time, the timer T2 is turned off (step ■), and the stop signal RE is
W and FF are transmitted (step [phase]) and rewinding is completed.

The embodiment shown in FIG. 5 shows a case where an encoder 27 that can detect the amount of conveyance of the film F by the number of pulses is provided in the conveyance process 11. The encoder 27 is composed of a roller 27a that contacts the surface of the film F, and a detection section 27b connected to the roller 27a via a rotating shaft, and converts the amount of rewinding of the film F into the amount of rotation of the roller 27a. However, when the tape is rewound by a certain amount, the detection section 27b sends a conveyance detection signal Z to the control circuit 26. Upon receiving this conveyance detection signal 2, the control circuit 26 transmits a drive signal REW to the rewind motor 10 in the same manner as described above.

The operation of this embodiment will be explained based on the flowchart shown in FIG.

Similarly to the above, the detection means 22 detects the leader tape F'.
is detected, and the control circuit 26 sends a stop signal R only to the rewind motor.
After a certain period of time after transmitting EW, low speed rewind signal REW'
At the same time as the signal is transmitted, the encoder 27 starts detecting the transport amount of the film F (step 2). Then, when the encoder 27 detects a constant conveyance amount of the film F (step ■), it sends a conveyance amount detection signal 2 to the control circuit 26, and upon receiving this, the control circuit 26 sends a low speed rewind signal REW'
is set to 0FFu, the timer T2 is turned on, and a drive signal REW is sent to the rewind motor 10 (step 2).

After a certain period of time has elapsed, the timer T2 goes to 0FFL (step ■), stop signals REW and FF are transmitted (step [phase]), and the rewinding is completed.

(Effects of the Invention) Since the present invention is configured as described above, after the leader tape rides on the outer circumferential surface of the flange of the rewind reel during rewinding of the film, the rewinding is stopped for -10 seconds, and then a constant It will rewind at a slow speed. Therefore, the leader tape of the film can be smoothly rewound without being wedged between the flanges. Further, in the case where the tape is rewound at a low speed for a certain period of time and then rewound at a normal speed, the rewinding time can be shortened compared to the case where the tape is always rewound at a low speed.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is an overall perspective view, FIG. 2(a) is a perspective view of the detection means, and FIG.
b) and (c) are explanatory diagrams showing the operation of the detection means;
4 and 6 are flowcharts showing the operation of the control circuit, FIG. 5 is an overall perspective view of another embodiment, and FIGS. 7 to 9.
The drawings show a conventional example: Fig. 7 is an overall schematic diagram, Fig. 8 is a partially cutaway perspective view of the cartridge, and Fig. 9 is a sectional view of the leader tape embedded between the flanges of the rewind reel. . Description of number 10... Rewind motor 19... Take-up reel 22... Detection means 27... Encoder F'... Leader tape... Timer mark... Rewind reel... Conveyance path 0... Winding motor 6... Control circuit... Film

Claims (3)

[Claims] (1) A long film wound on a rewind reel is wound on a take-up reel via a conveyance path, and the take-up reel or rewind reel is rotated by a take-up motor and a rewind motor, respectively. In a film transport device that winds and rewinds a film, a detection means detects a leader tape of the film and sends a detection signal when rewinding the film, and upon receiving the detection signal, the rewind motor stops. 1. A film conveying device comprising: a control circuit that transmits a signal and includes a timer that transmits a low-speed rewind signal to the rewind motor after a predetermined period of time after transmitting the stop signal. (2) The film transport device according to claim 1, wherein the control circuit transmits a drive signal to the rewind motor to return to the normal rotational speed after a certain period of time after transmitting the low speed rewind signal. . (3) The control circuit is connected to an encoder that detects the amount of film conveyance by the number of pulses at the same time as the low-speed rewind signal is transmitted, and the encoder transmits a conveyance detection signal when the film has been conveyed by a certain amount. 2. The film conveyance apparatus according to claim 1, wherein the control circuit is configured to send a drive signal to the rewind motor to return to a normal rotational speed when the control circuit receives the conveyance detection signal.