JPS60150040A - Retrieving method of microfilm - Google Patents

Abstract

PURPOSE:To retrieve the 1st frame speedily by conveying the microfilm at a high speed forward, backward, and then forward in order through two motors, and stopping the film at the 1st frame. CONSTITUTION:A DC motor M1 is driven by turning on contacts a1 and a2 of a switch 22 to feed the microfilm 1 in a direction M. An encoder 9 confirms that the film is fed by a specific extent and a controller stops the motor M1. At the same time, contacts b1 and b2 of switches 23 and 22 are turned on to drive a motor M2, thereby feeding the film 1 in a direction N at a high speed. The encoder 9 detects a specific movement extent of the film and then the motor M2 is stopped. The contacts a1 and a2 are turned on again to feed the film 1 in the direction M again at a high speed by the motor M1, and the film is fed at a low speed after the movement extent attains to a specific value to detect the bridge mark of the 1st frame of the film 1 by a retrieving part 4; and the motor M1 is then stopped to stop the film at the constant position of the retrieving part 4 accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of application of J-Jugyo 1-) This starting point 1 is used in a microfilm drive device
This article relates to a microfilm search method for quickly searching for the first frame of 1/4.

(Back Rat) Figure 1 shows a schematic configuration of a microfilm drive device, in which a cartridge 2 on which a roll microfilm 1 to be searched is wound is installed in a cartridge box 3 on the rewind side. The microreel 5reml automatically rewound from the cartridge 2 passes through the retrieval unit 4 and is dynamically wound by [:1] onto the autoreel 5 on the winding side. The wire ends of the microfilm 1 are fixed to the core 6 of the cartridge 2, and the core 6 of the cartridge 2 is rotatably driven by a straight 7Q motor M2. Furthermore, the autoreel 5 that winds the microfilm 1 is driven by a direct current motor, and the search section 4 detects whether light from the light source 7 is on the microfilm 1 or not. 1 (one shot), the transmitted light is concentrated by a lens system 8, and then optically sent to a printer etc. as image information on the microfilm 1. When winding and searching, the microfilm l is conveyed in the N direction by rotating the DC motor M1 in the P1 direction,
When the microfilm 1 wound on the auto reel 5 is wound onto the cartridge 2, the microfilm 1 is conveyed in the N direction by rotating the DC motor M2 in the 02 direction, and the search unit 4 searches for a desired frame image. It is now searchable.

In this way, when winding the microfilm 1 on the autoreel 5, the motor old is driven in the PL length direction to rotate the autoreel 5, but the motor M2 is not driven and rotates in 22 directions as the microfilm 1 is transported. Conversely, when rewinding the microfilm l into the cartridge 2, the motor M2 is rotated in the Q2 direction, but the motor M1 is driven in the 01 direction as the microfilm l is transported. It is in a state of rotation.

Furthermore, as shown in FIG. 2, the microfilm 1 consists of a front league part 11 where no images are recorded, a central image part 12 where frames 14 are recorded, and a rear trailer part 13 where no images are recorded. There is. A blip marker 15 is attached to each frame 14 to serve as a search mark.

In such a microfilm drive device, after the tip of the league part 11 of the microfilm 1 is taken out from the cartridge 2, passed through the retrieval part 4, and wound onto the autoreel 5 to complete loading, the microfilm 1 is driven by the DC motor M1. When transporting the league part 11 in the direction to search for the blip mark 15 of the first frame 14, if the league part 11 of the microfilm 1 is transported at a low speed,
Since the league section 11 is relatively long, searching for the first frame 14 will take time.

(Object of the Invention) An object of the present invention is to provide a first frame retrieval method in a microfilm drive device for quickly retrieving the first frame of a microfilm.

(Structure of the invention) This invention will be explained below.

The method of the present invention includes a first DC motor for transporting the microfilm in a first direction, and a second DC motor for transporting the microfilm in a second direction opposite to the first direction. This relates to a microfilm retrieval method in a drive device, in which the microfilm is sequentially conveyed in one direction from the league section to search for the first frame. A fixed portion of the microfilm is transported in one direction, the first frame is overrun, the first DC motor is stopped, and the rE action of the second DC motor is used as a brake, and then the microfilm is transferred to the second frame. It is conveyed at high speed in the second direction by the DC motor, passes the blip mark of the first frame, and is stopped at a predetermined length position from this blip mark, and the power generation action of the first DC motor is used as a brake. [7.Next, the microfilm is conveyed at high speed in the first direction for a predetermined length by the first DC motor, and then conveyed at low speed so that one end of the printer of the first frame is When the first frame is stopped, the power generation effect of the DC motor of wS2 is used as the load of the first DC motor during the low-speed conveyance before the stop I. The invention is characterized in that it is configured to allow

(Example) FIG. 3 shows a schematic configuration of an apparatus for realizing the method of the present invention, corresponding to FIG.
is added between the cartridge box 3 and the search section 4, for example.

Further, FIG. 4 is an electric circuit diagram for switching between the first DC motor old and the second DC motor M2, in which the motor drive circuit 21 is connected to the DC motor M1 or the DC motor M2 via the switch 22. When the contacts al and a2 of the switch 22 are on, the DC motor 2 is driven, and the DC motor 2 is a closed circuit with resistors R and ' to measure the rotational speed of the motor as a generator. Configure. Further, when the contacts bl and b2 of the switch 22 are on, the DC motor 2 is driven, and the old DC motor forms a closed circuit with a resistor R and the like. Further, a switch 23, which is controlled on and off by a control device (not shown), is provided so as to short-circuit the resistor R1 and apply the brake.

In such a configuration, after finishing loading by pulling out the tip of the league part of the microfilm 1 from the cartridge 2 and winding it on the autoreel 5 through the retrieval unit 4, the microfilm 1 is removed by a DC motor.
When transporting the league part II in the direction of and searching for the blip mark 15 of the first frame 14f, the relationship between the film position and the transport speed is shown in FIG.
Contacts al and a2 of No. 2 are turned on to drive the DC motor, and the microfilm 1 is transported in the N direction at a high speed of 1. At this time, the DC motor M forming a closed circuit with the resistor R
2 is rotated by the DC motor M1 together with the core 2 of the cartridge 2, generating electricity and current flowing in the closed circuit, but since the resistance R is relatively large and the current is small, the amount of power generated by the DC motor is small, and therefore The reverse torque generated with power generation is small. Then, after confirming that the constant microfilm has been sent by the encoder 9, the control device stops the DC motor M1, turns on the switch 23, and short-circuits both ends of the resistor R. To ensure that loading is performed properly at the start, the microfilm is
may be conveyed in the N direction, and if the encoder 9 is not rotating at that point, an alarm is issued, and if it is rotating, length measurement may be started. Further, the rotation signal of the encoder 9 is combined with the transport signal of the microfilm l and 1. If the encoder 9 does not advance a certain distance within a certain time, it can be used as an alarm signal.

The length of league part 11 of the microfilm is the model.

There are differences depending on the manufacturer, etc., but all of them fall within a certain range of length, so if you get a stop signal from the encoder 9 at the position where the length LO, which is slightly longer than the longest one, has been transported, The first frame 14F will definitely overrun. If both ends of the resistor R are short-circuited when stopping the DC motor old, the load on the DC motor M2 as a generator will be small, so a large current will flow in the closed circuit, and the amount of power generated by the DC motor M2 will be large. The reverse torque increases. As a result, DC motor M2
serves as a brake for the DC motor Ml.

Next, turn on the contacts bl and b2 of the switch 22, and
The l'l flow motor is driven to convey the microfilm l at high speed in the N direction. At this time, the encoder 9 again starts measuring the conveyance amount of the microfilm l.
Each time one end of the grip mark 15 of the frame 14 is detected, the conveyance amount is reset and a new measurement of the conveyance portion is started.

Therefore, if the conveyance amount is not reset even after measuring the conveyance amount of a certain length, this conveyance amount means the conveyance amount from the blip mark 15 of the first frame 14f, and this conveyance amount is the predetermined length Ll. When this occurs, the DC motor is stopped. At this time, omitting i+7 at both ends of the resistor R is as follows:
This is for the same reason as when stopping the old DC motor mentioned above.

Next, contacts al and a2 of the S/F border 22 are turned on again, the DC motor is driven to transport the microfilm 1 in the X direction at high speed, the amount of transport is measured by the encoder 9, and the predetermined length L2 is When the image is displayed, the first frame 14
If the DC motor M2 is stopped when one end of the blip mark 15 of the first frame 14f is detected, one end of the blip mark 15 of the first frame 14f will be accurately stopped at the reference position of the search unit 4. Note that a predetermined fixed value may be used to set the length of L2, but the distance #I from when the stop signal in the X direction and the N direction is input until the actual stop! 0 and! 1 may be measured by the encoder 9, and the value of L2 may be set each time by taking this value into account and performing a calculation using an arithmetic device (not shown). Furthermore, one end of the lip mark 15 herein includes either the left or right end. Immediately before stopping, the old DC motor rotates at a low speed and the microfilm l is transported at a low speed, but as the sliding friction force applied to the microfilm l increases, the →microfilm l is deflected and the microfilm l is transported smoothly. There is a risk that transportation will be difficult. Therefore, switch 23
Turn on the cartridge 2 and drive it to rotate 9:
When the load on the DC motor M2, which is generating electricity, is reduced, a large current flows through the closed circuit with the resistor R and a large reverse torque is generated. Therefore, the direct current motor Ml transports the microfilm l with high torque. Therefore, smooth conveyance can be achieved despite the increase in sliding friction.

As described above, according to the method of the present invention, high speed forward direction,
By repeatedly transporting in the reverse direction and then in the forward direction again,
Low-speed transport can be performed just before the first frame,
As a result, it became possible to search for the first frame in a short time. Furthermore, since one end of the blip mark is used as the basis for the search, alignment can always be performed at the same position regardless of the width of the blip mark. Furthermore, in low-speed conveyance, the resistance of the closed circuit of the single-flow motor that rotates as a generator is reduced and the generated reverse torque is increased, so there is no interference from sliding friction, etc. Allows for smooth transportation. Furthermore, by similarly increasing the reverse torque, there is a great advantage that a passively rotating DC motor can be used as a brake during high-speed conveyance.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic configuration of a microfilm driving device, FIG. 2 is a diagram showing a configuration of a microfilm, FIG. 3 is a diagram showing a schematic configuration of an apparatus for realizing the method of the present invention, and FIG. The figure is an electric circuit diagram for driving the motor, No. 5
The figure is a diagram showing the relationship between film position and transport speed for detailed explanation of the present invention. τ 1...Microfilm, 2...Cartridge, 4
...Search section, 5...Auto reel, 9...Encoder, 11...League section, 12...Image section, 13.
... Trailer part, 14... Frame, 15... Grip mark, 21... Motor drive circuit, 22.23...
switch. Applicant's agent Yuzo Yasugata

Claims (1)

[Claims] A microfilm drive device comprising a first DC motor that transports the microfilm in a first direction, and a second DC motor that transports the microfilm in a second direction opposite to the first direction. In the retrieval method, when the microfilm is sequentially conveyed in one direction from the league part to retrieve the first frame, the microfilm is first moved at high speed in the first direction by the first DC motor. The first frame is overrun and the first DC motor is stopped, and the power generation action of the second DC motor is used as a brake to first transfer the microfilm to the second DC motor. The motor transports the frame at high speed in the second direction, passes the blip mark of the first frame, and moves from this blip mark to the location 'li! At the same time, the power generation action of the first 1'1lIj motor is used as a brake 12, and then the microfilm is moved a predetermined length in the first direction by the first DC motor. The blip mark of the first frame is conveyed at a high speed, and then at a low speed, and the first frame is stopped at a semi-position. A microfilm retrieval method characterized in that the first frame is stopped at the fixed position of the first frame by using power generation as a load for the first DC motor.