JPS63189849A - Film feeder - Google Patents

Abstract

PURPOSE:To surely detect the defective winding of a film by providing a means for detecting the rotational speed of a film winding shaft, and when a detected rotational speed is not reduced to a value less than a prescribed rotational frequency within a fixed period and operating an alarm means. CONSTITUTION:A film 3 is carried in an arrow direction by the rotation of a capstan roller 6 and wound around a core part of a winding reel 9 by the rotation of a winding shaft 8. Although the rotational speed of the capstan roller 6 is fixed, the rotational speed of the winding shaft 8 is changed in accordance with the winding diameter of the film. Friction mechanisms 21-27 are used for driving the winding shaft 8 to attain proper film winding. When the leading end part of the film is disengaged from the reel 9 or the reel 9 is not set, the mechanisms 21-27 are not driven during a feeding period, the rotational speed of the winding shaft 8 is kept at 1.2 times the rotational speed of the capstan roller 6 and a signal from a photointerrupter 28 is inputted to a control circuit 29, which decides the generation of defective winding based on the input signal.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention [Field of Industrial Application] The present invention relates to a film feeder 922 in a rotary camera, microfilm reader, league printer, etc.

More specifically, the present invention relates to a film feeding device equipped with a capstan roller that feeds the film at a constant speed, and a film winding shaft having a friction mechanism for winding the fed film while maintaining tension.

[Conventional technology]

Conventionally, for example, film setting for a rotary camera was generally done manually. First, unshot raw film that had been wound on a reel was set on the film supply shaft in the film chamber, the leading end of the film was pulled out, and the leading end of the film was pulled out. Specified guide rollers, capstan rollers,
After being wound around a pinch roller or the like, the leading end of the film is wound around a previously prepared empty reel, and this empty reel is set on the film take-up shaft of the film chamber. After that, close the film chamber lid to block outside light and film! After performing league feed to remove fog at the leading end of the film during IC@, and winding the film by a predetermined length toward the empty reel, it becomes ready for photography.

Af+ automatic film loading mechanism
The leading end of the loaded film on the film chamber side is automatically run through a predetermined film running path to the film winding shaft side where the empty reel is set, and the leading end of the film is moved through the empty reel of the film winding shaft. Some wind the reel core automatically.

Roll-wound microfilm leagues and film sets in league printers can also be done manually or automatically as described above.

[Problem that the invention seeks to solve]

However, in the manual method, the method of winding the leading end of the film around the empty reel described above simply involves inserting the leading end of the film into a thin chuck groove provided in the core of the reel, so it easily comes off and the reel is After setting the film on the take-up shaft, if an operator who is inexperienced with film loading closes the film chamber lid and feeds the film without checking that the film is securely wound on the reel, the film may come off the reel midway. There is a fear that it will come off.

Even if an operator is skilled at this task, if the device is a rotary camera or other photographic device and he or she takes a cut, he or she may accidentally forget to set the film reel again afterward. It happens often.

In either case, the operator cannot see the inside of the light-shielding film chamber from the outside, so he or she continues to work (shooting) without noticing the above, and has to take out the film after shooting. The drawback was that when the film chamber lid was opened, the film that had accumulated inside the film chamber without being wound onto the reel would be exposed to light all at once, rendering it useless.

Even in the case of an auto-loading mechanism, winding the leading end of the film onto the empty film take-up reel is not completely free of failures, and the empty film take-up reel is often forgotten to be set, which can lead to the above-mentioned problems. .

A similar problem of film winding failure can occur in the case of microfilm league and reader printers.

Conventionally, as a method of detecting film winding failure during film setting as described above, a detection roller is pressed against the film. transmitting the displacement of the detection roller to a microswitch via an arm linked to the roller to actuate the switch;
The switch signal stops the film advance function,
There was a system in which appropriate warnings were given to the operator. However, this method has drawbacks such as the pressing force and displacement of the detection roller being delicate and difficult to adjust, and the mechanism being complicated due to mechanical means resulting in an increase in the size of the device.

The present invention was proposed in order to eliminate the above-mentioned drawbacks of the conventional technology. If it is off the reel,
Alternatively, if the take-up reel is not set and the film in the film chamber is not wound onto the take-up reel during film advance or shooting, a means for reliably detecting this with a simple configuration and giving a warning is provided. It provides:

Configuration of the Invention [Means for Solving Problems] The present invention has a capstan roller that feeds out a film at a constant speed, and a flexible mechanism that winds up the fed film while maintaining tension. In a film feeding device equipped with a film take-up shaft, means for detecting the rotation speed of the film take-up shaft is provided, and the rotation speed of the film take-up shaft detected by the detection means is rotated by a predetermined amount within a certain period of time. The object of the present invention is to provide a film feeding device which is characterized in that a warning means is activated when the number does not fall below a certain number.

[For production]

That is.

(A) When the leading edge of the film is securely locked to the film take-up reel and the film is being wound normally; (B) When the leading edge of the film is engaged with the film take-up reel when loading the film; This is the case when the stop is incomplete and has come off and the film cannot be taken up properly, or when the film take-up reel is not set.

The difference in the braking force of the friction mechanism acting on the film take-up shaft causes a clear difference in the rotational speed of the film take-up shaft.

Specifically, when the rotational speed of the film take-up shaft in the former case (A) is VA and that in the latter (B) is Va, there is a relationship of VA<VB. After loading the film into the film chamber, in the process of league feeding and winding the leading edge of the film by a predetermined length onto the film take-up reel, make sure that the leading edge of the film is securely attached to the take-up reel. When the film is locked, the film take-up axis will not move until the slack in the film between the capstan roller and the take-up reel is absorbed by the take-up and the film becomes taut between the capstan roller and the take-up reel. The rotation speed of is V
After that, the friction mechanism works and changes to Va. However, when the leading edge of the film is removed from the take-up reel or the take-up reel is not set, the friction mechanism does not work during the league feed period and the rotational speed of the film take-up shaft remains at Va and does not change.

Therefore, when it is detected that the rotational speed of the film winding shaft has changed from 7 days to VA, it is determined that the film winding has been performed normally, and if it remains at VB and no change occurs, it is determined that the winding is defective. In this case, a warning means is activated to warn the operator of this fact.

The rotational speed of the film winding shaft can be easily detected by electrical and optical means, and film winding defects can be detected accurately and reliably with a simple mechanism without the use of complicated mechanical mechanisms. Can warn you.

〔Example〕

In this example, the present invention is applied to a rotary camera.

FIG. 4 is a diagram showing the general structure of the film chamber of a rotary camera and the state when loading film, where l is a film supply shaft, 2 is a film supply reel set on the supply shaft L, and 3 is a reel. 4 is a roll of raw film, and 4 is a film guide roller.

5 is a positioning roller that regulates the movement of the film 3 in the width direction; 6 is a capstan roller that drives the film 3 to feed it; and 7 is a roller that presses the film 3 against the capstan roller 6 to prevent the film from slipping. Pinch roller, 8 is a film winding shaft, 9 is a take-up reel (empty reel) set on the winding shaft 8, 10 is an exposure slit, !
! 1 is a shutter, and 12 is an imaging lens.

Figure 5 is a diagram showing the structure of the take-up reel (empty reel) 9.
9b is a groove into which the tip of the film 3 is inserted.

FIG. 6 is a partial view showing the relationship between the capstan roller 6 and the film winding shaft 8 of the photographing device shown in FIG.
The figure is a sectional view of the rotation interlocking mechanism of both 6 and 8. In FIG. 1, reference numeral 13 denotes a film chamber body plate, 14 a one-way clutch provided on the shaft 6a of the capstan roller 6 to prevent the film 3 from returning, and 15 a one-way clutch provided on the shaft 6a of the capstan roller 6 to control the rotation of the capstan roller 6. 16 is a coupling pin between the shaft 6a and the gear 15, 17 is an idler gear, 18 is a shaft of the idler gear 17, 19 is an E-ring to prevent the idler gear 17 and the winding shaft 8 from being removed, 20 is a bushing, 21 is a winding shaft gear, 22 is a friction plate, 23 is a pressing plate, 24 is a connecting pin between the shaft 8 and pressing plate 23, 25 is a friction spring, 26 is a spring holder, and 27 is a spring holder. The fixing screw 23a is a slit provided on the outer peripheral edge of the plate 23, and 28 is a photointerrupter (photosensor).

In FIG. 4, the film 3 is fed in the direction of the arrow in the figure by the rotation of the capstan roller 6.

The fed film 3 is wound around the core portion of the take-up reel 9 by rotation of the take-up shaft 8. At this time, the rotation speed of the capstan roller 6 is constant, but the rotation speed of the take-up shaft 8 varies depending on the diameter of the film wound on the take-up reel 9. However, friction mechanisms 21 to 27 are generally used to drive the winding shaft 8, and even if the film winding diameter changes, the friction torque and the pressing of the pinch roller 7 are controlled by the film tension caused by the force. Since the rotational winding speed changes accordingly, appropriate film winding is possible even if a constant rotational speed is applied. On the other hand, the film supply shaft 1 does not need to be driven, but it similarly uses a friction mechanism, and even if the film winding diameter of the supply reel 2 changes, it can maintain the film by applying an appropriate pack tension to the film 3. This prevents sagging.

In FIG. 6 and FIG. 1, in this embodiment, the rotational speed vc of the capstan roller 6 and the rotation of the winding shaft 8 are in a state in which no film is loaded. Namely.

If the take-up reel 9 is not set on the take-up shaft 8 or if the film has come off from the chuck groove 9b of the core portion 9a of the first take-up reel 9 and the film is not taken up properly, Since the friction mechanisms 21 to 27 do not act, the take-up shaft 8 rotates at a speed 1.2 times that of the capstan roller 6.

On the other hand, when the leading edge of the film is securely held in the chuck groove 9b and proper film winding is being performed, the above-mentioned friction mechanisms 21 to 27 act on the winding shaft 8. In this case, in this embodiment, the diameter Dc of the capstan roller 6 is 20 mm, and the nD of the core portion 9a of the take-up reel (empty reel) 9 is approximately 30 mm. In this state, tension is maintained on the film 3 by the pinch roller 7 pressed against the capstan roller 6 and the friction mechanisms 21 to 27 in the take-up shaft 8, so there is no slack or slippage of the film. The rotational speed V of the winding shaft 8 is approximately 0.67 times the rotational speed of the capstan roller 6. As the winding of the film progresses and the diameter of the film on the take-up reel 9 increases, this value becomes smaller and the rotation of the take-up shaft 8 becomes smaller.

The capstan roller 6 is rotated at a constant speed by a drive from the main body or an independent drive source (not shown).
The winding shaft 8 has a gear 16, two hydraulic gears 17, and a gear 2.
1. It rotates by receiving drive from the capstan roller shaft 6a via the friction mechanisms 21 to 27. The gear 21 is not fixed to the winding shaft 8, but is held from the lower end of the winding shaft 8 by a spring 25, and the shaft 8 is held by a pin 24.
The pressing force fixed to rotates the shaft 8 by friction with the plate 23. Note that a flexible pad 22 is inserted between the gear 21 and the pressing plate 23.

The pressing plate 23 rotates integrally with the winding shaft 8, and the slit 23a provided on its outer periphery constitutes an encoder means for detecting the rotational speed of the winding shaft 8 together with a photo interrupter 28. There is. That is, in the pressing, the rotational speed of the winding shaft 8 can be detected by counting the number of pulses per unit time detected by the photointerrupter 28 as the plate 23 (=winding shaft 8) rotates.

FIG. 3(L) shows a state in which film winding is not performed properly, that is, when the rotational speed of the winding shaft 8 is high.
b) shows the form of the pulses output from the photointerrupter 28 in a state where the film winding is properly performed, that is, when the rotational speed of the winding shaft 8 is slow.

Therefore, in the league feeding process after the film 3 is loaded onto the device manually or by auto-loading, if the leading edge of the film is securely locked to the take-up wheel 9, the leader feeding is not performed. The rotational speed of the film take-up shaft 8 remains frictional from the time when the film starts to be taken up until the slack in the film between the capstan roller 6 and the reel 9 is absorbed by the winding and the film between both 6 and 9 becomes tensioned. Since the mechanisms 21 to 27 do not operate, the rotation speed is 1.2 times that of the capstan roller 6, and the rotation speed is detected by the encoder means 23a and 28, and the photointerrupter 28 outputs a signal corresponding to the rotation speed as shown in FIG. ) is output and input to the control circuit 29 (FIG. 1). After that, capstan roller 6 and reel 9
Friction mechanisms 21 to 2 based on the tension of the film between
7 works, the rotational speed of the winding shaft 8 is controlled by the capstan roller 6.
The photointerrupter 28 outputs a pulse signal as shown in FIG. 3(b) corresponding to the rotation speed, and inputs it to the control circuit 29.

On the other hand, when the leading end of the film is detached from the take-up reel 9 or the take-up reel 9 is not set, the friction mechanisms 21 to 27 do not operate during the league feed period, and the rotational speed of the 8-take shaft 8 is lower than that of the capstan roller. The rotation speed remains 1.2 times that of 6.

The control circuit 29 is connected to the photointerrupter 28 as shown in FIG.
The pulse signal of a) continues to be input. In this case, the control circuit 29 determines that a film winding failure has occurred.
Based on this determination, the film feed of the apparatus is automatically stopped, and a warning means 30 such as a buzzer display lamp is activated to warn the operator of this fact.

If an abnormal current flows to the motor or if the reel comes off, the rotational speed will be higher than around the reel, but a warning will be issued as an abnormality in that case as well.

In the above embodiment, 1l of the capstan roller 6
Dc is 20■■, and the capstan roller 6 is in a state where the friction mechanisms 21 to 27 do not act, but the present invention is not limited to this as long as the following relationship is satisfied.

Further, the drive transmission means from the capstan roller 6 to the winding shaft 8 is not limited to gears, and may be a belt, pulley, or the like.

Furthermore, the encoder means 23a and 28 are connected to the friction mechanism 2.
1 to 27, but apart from this, it may be provided on a part of the winding shaft 8.

Further, although the winding shaft 8 is rotated by receiving the drive transmitted from the capstan roller 6, it may be rotated at the above-mentioned predetermined speed ratio by a drive source independent of the capstan roller 6.

Although the rotary camera has been described above, it goes without saying that the present invention can also be applied to other microfilm leagues and microfilm league printers in which film is set manually or automatically using an autoloading mechanism.

C. As described in detail, according to the present invention, when a film winding failure occurs in a rotary camera, a microfilm reader, a league printer, etc., it can be reliably detected and warned by a simple means configuration. It is possible and the intended purpose is well achieved.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the rotation interlocking mechanism between the capstan roller and the film winding shaft, the wIIZ diagram is a perspective view of the photo encoder portion as a means for detecting the rotational speed of the film winding shaft, and Figures 3 (a) and (b). ) is a diagram showing an example of the form of the pulse output from the photointerrupter when the rotational speed of the winding shaft is fast and slow, respectively. Figure 4 is a film travel path diagram of a rotary camera, and Figure 5 is a diagram showing the form of the pulse output from the photo interrupter. A perspective view of the film take-up reel, FIG. 6 is a partially enlarged view of FIG. 4. 6 is a capstan roller, 8 is a film take-up shaft, 9 is a film take-up reel, 21 to 27 are friction mechanisms, 2
3a and 28 are photo encoders as means for detecting the rotational speed of the winding shaft, 29 is a control circuit, and 30 is a warning means such as a buzzer fist indicator lamp. Figure 6 Figure 5

Claims (1)

[Claims] (1) A film feeding device equipped with a capstan roller that feeds out a film at a constant speed, and a film winding shaft that has a friction mechanism that winds up the fed film while maintaining tension, the film winding shaft. A means for detecting the rotational speed of the
A film feeding device characterized in that a warning means is activated if the rotational speed of the film take-up shaft detected by the detection means does not fall below a predetermined number of rotations within a certain period of time.