JPH0486817A - Latent image printing device - Google Patents

Abstract

PURPOSE:To press sprocket teeth which carry an unexposed film to a printing drum against the front edges of perforations in a conveying direction by making the contact length between the printing drum and unexposed film shorter than logical contact length. CONSTITUTION:The unexposed film F is wound around a flywheel 4 through guide rollers 1. The unexposed film F which is carried out of this flywheel 4 is carried to the printing drum 7 which has sprocket teeth 6 engaging the perforations. The external diameter of the printing drum 7 is so set that the contact length is 0.2 - 0.35mm shorter than the logical contact length when the unexposed film F is wound around the drum 7 at a specific winding angle. The printing drum 7 rotates without any slip of the unexposed film F.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a latent image stamping device for a film processing machine that stamps a latent image on an unexposed film of a photographic roll film.

[Prior art] In the conventional process of producing photographic roll film, latent images such as the frame No. 1 side mark, side line, DX barcode, frame No. barcode, etc. are imprinted on unexposed film as a collection of minute dots. The printing device engaged the perforations of this unexposed film with the sprocket teeth of the printing drum that constituted the latent image printing device, and transported the unexposed film at a predetermined speed while preventing the unexposed film from shifting. The relationship between the sprocket teeth of a conventional loading drum and the perforations of the unexposed film that engage with these teeth will be explained based on FIG. 347. In FIG. 7, sprocket teeth 42 are arranged on a loading drum 41 at equal intervals in accordance with the pitch of perforations 43. As shown in FIG.

Conventionally, the pitch a of the sprocket teeth 42 was equal to the pitch of the perforations 43, taking into account the elongation of the unexposed film F due to tension. That is, the outer diameter of the loading drum 41 is determined based on the theory that the unexposed film F contacts the outer periphery of the loading drum 41 when the unexposed film F is wound at a predetermined winding angle θ, taking into account the above-mentioned elongation. It was calculated backwards from the length Lf.

When the unexposed film F is conveyed, the control device 44 constituting the latent image printing device rotates as the loading drum 41 rotates.
The dot data of the latent image character stored in is read out, and then the light source LED in this control device 44 is selectively emitted, and this light is introduced to the projector 45 on the loading drum 41 through an optical fiber, and then The latent image is inserted into a predetermined position on the film.

The latent image burned in this way is formed on the unexposed film F.
It is necessary to insert it at a certain fixed position with respect to the standard length of , and also at a certain fixed position with respect to the perforation 43. This latent image has a diameter of 0.095 mm.
The dots are printed in sequence at intervals of 475 mm as the unexposed film F is transported, and if there is an error in the adjacent pitch of the dots to be inserted, the shape of the printed figure may be distorted, or it may become distorted, such as a bar code. If the size standards are set in

Therefore, in the vicinity of the figure to be inserted, it is necessary to measure the film position with a sufficiently high degree of accuracy in order to meet the above standards.

Conventionally, in the case of unexposed film F of a standard size, such as 12.24.36EX size, the measurement of the film position for loading the latent image has been carried out by cutting a notch on each unexposed film F indicating the standard length position. The notch and perforation 43 are detected using respective detection devices, and then pulses of a rotary encoder that is directly connected to the rotating shaft of the loading drum and generates pulses corresponding to the amount of movement of the unexposed film are detected. Position was measured by counting the number of objects.

[The problem that the invention tries to solve! ! ] Therefore, in order to measure the film position with high precision, it is necessary to measure the amount of movement of the unexposed film F due to the rotation of the loading drum 41 and the amount of movement of the loading drum 4 measured by the rotary encoder.
It must be completely synchronized with the rotation angle amount of 1. However, when the aforementioned notch cutter cuts the notch,
Unevenness may occur in the conveyance of this unexposed film F.

Further, in order to cut the unexposed film F to a predetermined length, it is necessary to transport the film intermittently, and as a result, pulsations may occur in the transport of the unexposed film F on the loading drum 41 as well. be. If a relative misalignment occurs between the perforations 43 and the sprocket teeth 42 at these times, it becomes impossible to accurately measure the latent image loading position.

As mentioned above, the sprocket teeth 4 of the conventional loading drum 41
2 and the bar foration 43 of the unexposed film F, as shown in FIG. 7, the pitch a of the sprocket fT42 and the pitch of the perforation 43 were set to be equal. Therefore, in order to prevent such misalignment, it was necessary to fit the sprocket teeth 42 and the perforations 43 without any gaps.
Based on the relationship with the edges of 3, what is the standard size of perforation 43? 1dt=198mm, whereas sprocket f#42 had a maximum d2=1.75mm. Therefore, in the conventional latent image burning device, the distance between the sprocket *42 of the loading drum 41 and the perforation 43 is 0.2
There was a play of 3 mm, and if pulsation occurred in the conveyance of the unexposed film F, there was a risk that the latent image loading position would shift.

The present invention aims to eliminate the above-mentioned drawbacks of the conventional latent image burning device of a film processing machine. By making the contact length with the exposed film 0.2 to 0.35 mm shorter than the theoretical contact length, the sprocket teeth that carry the unexposed film into the loading drum are pressed against the green front of the perforation in the transport direction. The purpose is to keep it.

Further, in the latent image printing apparatus according to claim 2, the contact length is made longer by 0.2 to 0.35 mm than the theoretical contact length, so that the sprocket teeth for carrying the unexposed film into the loading drum can be conveyed. It is intended to be pressed against the rear edge of the perforation relative to the direction.

Further, the latent image printing apparatus according to claim 3 includes, in addition to the loading drum according to claim 1, means for applying a torque in the same direction as the unexposed film conveyance direction to the rotating shaft of the loading drum. The purpose is to keep the sprocket teeth pressed against the front edge of the perforation in the transport direction during transport.

Further, the latent image printing apparatus according to a fourth aspect of the present invention includes, in addition to the loading drum according to the second aspect, a means for applying a torque to the rotating shaft of the loading drum in a direction opposite to the direction in which the unexposed film is conveyed. The purpose of this is to keep the sprocket teeth pressed against the rear edge of the perforation in the transport direction during transport.

[i! Means for Solving the Problem] In order to solve the problem, a latent image printing device for a film processing machine according to claim 1 of the present invention has a sprocket tooth that engages with a perforation of an unexposed film being conveyed. In a latent image printing device of a film processing machine that optically prints latent image data using a loading drum, the contact length when the unexposed film is wrapped around the loading drum at a predetermined winding angle. is characterized in that it has a loading drum that is 02 to 0.35 mm shorter than the theoretical contact length determined from the winding angle.

Further, the latent image printing device of the film processing machine according to claim 2,
The method is characterized in that the loading drum has a contact length between the loading drum and the unexposed film that is 02 to 0.35 mm longer than the theoretical contact length.

Further, the latent image printing device of the film processing machine according to claim 3,
The present invention is characterized in that it includes means for applying a torque in the same direction as the unexposed film transport direction to the rotating shaft of the loading drum.

Furthermore, the latent image printing device for a film processing machine according to a fourth aspect of the present invention is characterized in that it has means for applying a torque in a direction opposite to the direction in which the unexposed film is conveyed to the rotating shaft of the loading drum.

[Function] The latent image burning device of the film processing machine according to claim 1 has the following features:
02 to 0.35 mm from the theoretical contact length with the loading drum when the unexposed film is wrapped around the perforation of the unexposed film during transport at a predetermined winding angle.
The sprocket teeth of the loading drum, which have a short contact length, are engaged and conveyed.

Further, the latent image printing device of the film processing machine according to claim 2,
02 to 0.35 mm from the theoretical contact length with the loading drum when the unexposed film is wrapped around the perforation of the unexposed film during transport at a predetermined winding angle.
Conveying is carried out by engaging the sprocket teeth of the loading drum, which has a long contact length.

Further, the latent image printing device of the film processing machine according to claim 3,
A torque is applied to the rotating shaft of the loading drum according to claim 1 in the same direction as the unexposed film transport direction, and the sprocket teeth are pressed against the front edge of the perforation gin in the transport direction during transport. .

Further, in the latent image printing device of the film processing machine according to the fourth aspect, a torque is applied to the rotating shaft of the loading drum according to the second aspect in a direction opposite to the direction in which the unexposed film is conveyed. The teeth are pressed against the rear edge of the perforation in the transport direction.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a side view showing the configuration around the cooking section of a latent image printing device of a fixed size film processing machine. The main body of the fixed size film processing machine is a dark room, where a long unexposed film F pulled out from the original magazine (not shown) is stored.
is wound around the rotary notch 2 via the guide roller 1.

This rotary notch 2 is operated under the control of a control device 3, and a notch is provided at one edge of the unexposed film F every time the unexposed film F is fed by a predetermined number of frames.

Next, the unexposed film F provided with this notch is wound around the flywheel 4 via the guide roller 1.

The outer periphery of the flywheel 4 is made of rubber, and a nip roller 5 made of rubber is disposed facing the outer periphery of the flywheel 4. This nip roller 5 is for preventing the unexposed film F wound around the outer periphery of the flywheel 4 from slipping. Further, this flywheel 4 is used to generate bow tension in the unexposed film F in accordance with the acceleration when the unexposed film F is accelerated to rapidly accelerate its conveyance speed. Moreover, between the rotary notch 2 and this flywheel 4,
A notch detector 15 and a perforation detector 16 are arranged to detect the notches and perforations and send detection signals to the control device 3.

The unexposed film F discharged from the flywheel 4 is then conveyed to a loading drum 7 having sprocket teeth 6 that engage with the perforations. The outer diameter of the loading drum 7 is set to a contact length that is 0.2 to 0.35 mm shorter than the theoretical contact length when the unexposed film F and the loading drum 7 are wound at a predetermined winding angle. , that is, the size has a circumferential length. This loading drum 7
A rotary encoder 9 is directly connected to one end of the rotating shaft 8, and the rotary encoder 9 outputs pulses according to the amount of conveyance of the unexposed film F, and sends these pulses to the control device 3. This control device 3 detects the position of the unexposed film F based on the aforementioned notch and puff odor detection signals and the pulse counts. Based on this position detection signal, latent image data stored in advance in this control device 3 is read out, and a light source LED provided in the control device 3 is selectively caused to emit light. The light from this light source LED is guided to the projector 10 through an optical fiber, and predetermined latent image data is formed on the surface of the unexposed film F on the cooking drum 7.

The formed image changes sequentially as the unexposed film F moves, and the latent image data stored in the control device 3 is reproduced on the unexposed film F.

A torque motor 11 is directly connected to the other end of the rotating shaft 8 of the loading drum 7, and by applying a rotational force to the loading drum 7 in the film transport direction, the sprocket teeth 6 are Stable forward tension is applied even if conveyance is temporarily stopped.

The film on which the latent image has been imprinted by the loading drum 7 is conveyed via a dancer roller 12 for absorbing speed differences to a fixed length sprocket section 13 that conveys the film to a predetermined size. , and then cut by a cutter for standard length (not shown).

Next, the operation of the unexposed film F on the loading drum 7 will be explained in detail with reference to FIG.

The unexposed film F is wound around the loading drum 7 by engaging each perforation 14 with the sprocket teeth 6,
The unexposed film F and the loading drum 7 are rotated so that they do not slip. The contact angle between the loading drum 7 and the unexposed film F is θ=π, and the unexposed film F has a tension T=0.
Assuming that 260 [Kgf/mrri'' is applied, the theoretical calculated value of the outer diameter of the loading drum 7 is as follows.

Film thickness d=0.14mm Number of sprocket teeth p=36 Film Young's modulus E=400 [Kgf/mrn' Here, the circumference Lfm of the semicircle at the center of the film thickness d is the diameter of this semicircle A Then, it can be expressed as A=D+d 2Lfm=Aπ=4.75p (1+T/E), so by substituting the above values, the theoretical outer diameter of the loading drum 7 becomes D=54.33 mm.

On the other hand, the optimum dimension value determined by experiment is Db=54.15±0.05mm It becomes.

Therefore, if the contact angle between the loading drum 7 having the optimal dimension Db and the unexposed film is θ=π, then the actual contact length Lb and the theoretically calculated semicircular contact length of the unexposed film F, The circumferential length difference Δ=LbLfl with fl is Δ=-0.20
mrr+ to −0.36 mm.

When the unexposed film F is conveyed by engaging with the sprocket teeth 6 of the loading drum 7 having such an outer diameter, Lb<Lf
1, the sprocket teeth 6 are fed faster than the unexposed film F is transported, and eventually the sprocket fI on the side that is carried into the loading drum 7 as shown in FIG.
6a, the perforation 1 is always in the transport direction.
The paper is conveyed while being pressed against the front edge 14a of the paper.

Then, on the sprocket i6b on the unloading side, Δ=020 mm to 0.0 mm from the front edge 14a of the perforation 14.
This will leave a gap of 36mm.

Note that if the outer diameter of the loading drum 7 becomes too small than the optimum drum outer diameter Db, the sprocket teeth 6a will break into the perforations 14 of the unexposed film F on the loading side.
If the vehicle does not fit properly, it will run aground and become impossible to transport. Also, the above D
If it is larger than b, it will be close to the theoretical value, so the unexposed film F cannot be stably pressed on one side, and due to the change in tension acting on the unexposed film F, there will be a gap between the perforation 14 and the sprocket tooth 6a. A relative discrepancy will occur.

In this example, the optimum drum outer diameter Db was determined by setting the contact angle between the loading drum 7 and the unexposed film F to θ=π, but as mentioned above, the sprocket tooth 6a on the loading side is always in front of the perforation 14. Press the edge 14a of the part,
On the other hand, the sprocket i6b on the unloading side and the front edge 14a of the perforation 14 are Δ=0.20 mm to 0.36
The outer diameter of the loading drum 7 and the winding angle of the unexposed film F may be different from those in this embodiment, as long as they satisfy the relationship of creating a gap of mm.

As described above, by using the loading drum 7 having the optimal drum outer diameter Db, when carrying the unexposed film F into the loading drum 7, the sprocket @ 6 a is pressed and conveyed, and forward tension is applied to the sprocket teeth 6 by the drive of the torque motor 11 which is attached and directly connected to the rotating shaft 8 of the loading drum 7, so that the perforation 14 is always The sprocket teeth 6a will be pressed against the front edge 14a of the sprocket.

Furthermore, by passing the unexposed film F through the flywheel 4 before loading it into the loading drum 7, when an acceleration occurs in the unexposed film F that rapidly accelerates the conveyance speed,
A tensile force corresponding to this acceleration is generated in the unexposed film F to prevent the sprocket teeth 6a from separating from m 14 a at the front of the perforation 14.

Next, another embodiment will be described based on FIG.

Figure 4 shows the configuration around the loading section of the latent image burning device of a one-size-fits-all film processing machine in which the conveyance distance between the loading drum, which is the latent image loading section, and the fixed length sprocket, which is the film cutting device, is short. FIG.

Unlike a fixed size film processing machine, in the case of a free size film processing machine, it is impossible to insert a notch that indicates the fixed length position across all sizes, so the notch can be detected and the latent image processed. No control to start. For this reason, in the case of a one-size-fits-all film processing machine, the latent image is formed just before the fixed-length sprocket where the cutting position is determined. In the case of this one-size-fits-all film processing machine, the unexposed film F is pulled out from a source magazine (not shown) and then transferred to a loading drum 27 having sprocket teeth 26 that engage with perforations via dancer rollers (not shown). will be transported to. The outer diameter of the loading drum 27 is set to a contact length that is 02 to 0.35 mm longer than the theoretical contact length when the unexposed film F and the loading drum 27 are wound at a predetermined winding angle, that is, the circumference. It has a long size. A rotary encoder 2 is attached to one end of the rotating shaft 28 of the loading drum 27.
The rotary encoder 29 outputs pulses according to the amount of conveyance of the unexposed film F, and sends these pulses to the control device 23. This control device 23 counts these pulses based on the operation signal of the fixed length cutter 36, detects the position of the unexposed film F based on the counted value, and The image data is read out and the light source LED is selectively emitted. The light from this light source LED is guided to the projector 30 through an optical fiber, and predetermined latent image data is formed on the surface of the unexposed film F on the loading drum 27.

A torque motor 31 is directly connected to the other end of the rotating shaft 28 of the loading drum 27, and by applying a rotational force to the loading drum 27 in the opposite direction to the direction of film transport, the sprocket teeth 26 is designed to apply stable back tension even if conveyance is temporarily stopped.

Next, the unexposed film F on which the latent image has been printed is wound around the flywheel 24. The outer periphery of the flywheel 24 is made of rubber, and a nip roller 25 made of rubber is disposed facing the outer periphery of the flywheel 24. This nip roller 25 is fixed to an arm 33 that is biased by the elasticity of a coil spring 32, and is pressed against the flywheel 24 to prevent the unexposed film F wound around the outer periphery of the flywheel 28 from slipping. A pressing force is applied. The unexposed film F carried out from the flywheel 24 is conveyed via a guide roller 34 to a fixed-length sprocket 35 that conveys the unexposed film F to a predetermined size, and then cut by a fixed-length cutter 36. . Since the fixed length sprocket 35 carries out intermittent conveyance, an acceleration is generated in the unexposed film F that rapidly reduces the conveyance speed. If walnuts occur between the loading drum 27 and the regular sprocket 35 at this time, there is a risk that the unexposed film F on the loading drum 27 may slip. To prevent this slippage, the flywheel 2
4 and the nip roller 25 generate a tensile force on the unexposed film F in accordance with the acceleration.

Next, the operation of the unexposed film F on the loading drum 27 will be explained in detail with reference to FIG.

The unexposed film F is wound around the cooking drum 27 by engaging each perforation 14 and the sprocket i26, and is rotated so that the unexposed film F and the loading drum 27 do not slip. If the contact angle between the loading drum 27 and the unexposed film F is θ = π, and the unexposed film F is subjected to a tension T = 0.260 [Kgf/mrn''], the outside of the loading drum 27 is assumed to be The theoretical calculation value of the radius is calculated as follows using the same calculation as in the case of a regular size film processing machine.

=54. 33mm (Film thickness d=0.14mm) On the other hand, the optimum dimension value determined by experiment is Db=54.50±0.05mm.

Therefore, if the contact angle between the cooking drum 27 having the optimal dimension Db and the unexposed film F is θ=π, then the actual contact length Lb and the theoretically calculated contact circumference Lfl of the semicircle of the unexposed film F. The circumferential length difference Δ=Lb−Lf 1 is Δ=0.1
It will be 9 to 0.35 mm.

The sprocket teeth 26 of the loading drum 27 have such an outer diameter.
When the unexposed film F is conveyed by engaging with Lb>L
Due to the relationship f, the unexposed film F is transported faster than the sprocket teeth 26, and as shown in FIG.
In this case, the paper is conveyed while being pressed against the rear edge 14b of the perforation 14 in the conveyance direction. And on the sprocket tooth 26b on the delivery side, perforation 1
A gap of Δ=0.19 to 0.35 mm is opened from the rear edge 14b of 4.

Note that if the outer diameter of the loading drum 27 becomes too large than the optimal drum outer diameter Db, the sprocket @ 26 a will not fit the perforations 14 of the unexposed film F on this carry-in side and will ride on it, making it impossible to transport it. . Also, if it is smaller than the above Db, it will be close to the theoretical value, so
If the unexposed film F cannot be stably pressed one-sidedly and the tension acting on the unexposed film F changes, a relative misalignment will occur between the perforations 14 and the sprocket teeth 26a.

In this example, the optimum drum outer diameter Db was determined by assuming that the contact angle between the loading drum 27 and the unexposed film F was θ=π;
a presses the rear edge 14b of the perforation 14, while the discharge side sprocket 126b and the rear edge 14b of the perforation 14 are Δ=0.19 to 0.3.
The outer diameter of the loading drum and the winding angle of the unexposed film F may be different from those in this embodiment, as long as the relationship of creating a gap of 5 mm is satisfied.

As described above, by using the loading drum 27 having the optimal drum outer diameter Db, when carrying the unexposed film F into the loading drum 27, the sprocket teeth are attached to the rear edge 14b of the perforation 14. 26a is pressed and conveyed, and back tension is applied to the sprocket teeth 2.6 by the drive of the torque motor 31, which is attached and directly connected to the rotating shaft 28 of the loading drum 27, so that the perforation is guaranteed. 14 rear edge 1
This means that the sprocket teeth 26a are pressed against the sprocket teeth 4b.

Furthermore, before the unexposed film F is unloaded from the loading drum 27 and loaded into the fixed length sprocket 35, the unexposed film F is given an acceleration that rapidly reduces the transport speed via the flywheel 24 and the nip roller 25. occurs, a tensile force corresponding to this acceleration is applied to the unexposed film F.
This prevents the sprocket @26a from separating from the rear edge 14b of the perforation 14.

[Effects of the Invention] As explained above, the latent image burning device of the film processing machine according to claim 1 allows the contact length between the loading drum and the unexposed film to be 02 to 0.35 mm smaller than the theoretical contact length. By making it short, the sprocket teeth that carry the unexposed film into the loading drum can be pressed against the front edge of the perforation in the conveying direction.

Further, in the latent image printing apparatus according to claim 2, the contact length is made longer by 0.2 to 0.35 mm than the theoretical contact length, so that the sprocket teeth for carrying the unexposed film into the loading drum can be conveyed. It can be conveyed by pressing against the rear edge of the perforation with respect to the direction.

Further, the latent image printing apparatus according to claim 3 includes, in addition to the loading drum according to claim 1, means for applying a torque in the same direction as the unexposed film conveyance direction to the rotating shaft of the loading drum. During conveyance, the sprocket teeth can be pressed against the front edge of the perforation in the direction of conveyance.

In addition to the loading drum according to claim 2, the latent image printing apparatus according to claim 4 always applies a torque to the rotating shaft of the loading drum in a direction opposite to the direction in which the unexposed film is conveyed. By having the means, it is possible to keep the sprocket teeth pressed against the rear edge of the perforation with respect to the transport direction during transport.

In this way, the invention according to claims 1 to 4 can eliminate the positional shift of the unexposed film on the loading drum with a simple structure, and can improve the printing accuracy.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the structure around the cooking section of the latent image burning device of a film processing machine of fixed size according to the present invention, and Figures i2 and 2S3 show the structure of the latent image burning device of this film processing machine. FIG. 4 is a side view illustrating the operation of the unexposed film on the loading drum, and FIG. 4 is a perspective view showing the configuration around the loading section of the latent image burning device of a free-size film processing machine based on another embodiment of the present invention. Figure 6 is a side view illustrating the operation of the unexposed film on the loading drum in the latent image printing device of this free size film processing machine.
The figure is a side view illustrating the relationship between the sprocket teeth of a conventional loading drum and the perforations of the unexposed film that engage with the teeth. In the figure, F is an unexposed film, 2 is a rotary notch, 4.24 is a flywheel, 525 is a nip roller,
6.26 is a sprocket tooth, 727 is a loading drum, 9.
29 is a rotary encoder, 10.30 is a floodlight, 1
1.31 is a torque motor, 13.35 is a fixed length sprocket, 36 is a fixed length cutter, 14 is a perforation, θ
is the contact angle between the loading drum and the unexposed film, Lb is the actual contact length between the loading drum and the unexposed film, and Lfl is the theoretically calculated contact length between the unexposed film and the loading drum.

Claims (1)

[Scope of Claims] 1. A latent image burning device for a film processing machine that optically burns latent image data using a burning drum having sprocket teeth that engages with perforations of an unexposed film being transported, The contact length when the unexposed film is wound around the printing drum at a predetermined winding angle is 0.2 to 0.35 greater than the theoretical contact length determined from the winding angle.
A latent image burning device for a film processing machine, characterized by having a burning drum that is shortened by mm. 2. The film processing machine according to claim 1, further comprising a burning drum in which a contact length between the burning drum and the unexposed film is 0.2 to 0.35 mm longer than the theoretical contact length. latent image burning device. 3. The latent image printing device for a film processing machine according to claim 1, further comprising means for applying a torque in the same direction as the unexposed film conveyance direction to the rotating shaft of the printing drum. 4. The latent image printing device for a film processing machine according to claim 2, further comprising means for applying a torque to the rotation shaft of the printing drum in a direction opposite to the direction in which the unexposed film is conveyed.