JPS6033736B2 - Winding device for strip photographic material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding device for a strip of photographic material, particularly a light-shielding winding device that is rotatably mounted on the inlet side and equipped with a guide groove movable so as to be in contact with the outer periphery of the winding core on the outlet side. The present invention relates to a winding device for strip-shaped photographic material used in cassettes.

For example, in a cassette for roll paper (photographic material), it has been desirable to provide a capture or loading mechanism within the cassette to avoid wasting time and photographic material when securing the beginning of the roll paper.

A winding device is known, for example from DE 24 45 998, in which the photographic material is guided between the steps of the core body by movable guide grooves of the type mentioned in the introduction. A friction layer is provided on the step,
The friction layer causes the edges of the photographic material to be carried away when the core body rotates. Devices of the aforementioned type are unnecessarily expensive due to the unique shape of the core body, and furthermore, the control of the guide grooves is complicated. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a winding device of the type mentioned at the outset, which is simple in construction, reliable in drive and inexpensive to manufacture.

According to the present invention, the photographic material guided onto an ordinary core, such as paper 8, is wound around the core, and when the strip of photographic material turns about one and a half times on the core, the ends of the photographic material are brought into contact with the core. automatically and firmly held.

No control unit is required to move the guide groove. When rewinding a photographic material, there is no crease at the "end" of the photographic material, that is, the starting edge of the photographic material when it is wound up, and the photographic material is not fixed in the user's mind, so the end of the unwinding No drag occurs even when stepping.

By means of the flexible strip of the invention which rests against the wound photographic material throughout the entire winding process, the photographic material is only slightly damped, thereby tightening the wound photographic material.

Therefore, it is possible to omit a brake mechanism when winding up. Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a cassette for carrying a strip of photographic material, such as a roll paper such as photographic paper, and the cassette is provided with an insertion opening 2. As shown in FIG.

A pair of rollers 3 having a light shielding effect are provided behind the insertion opening. A guide groove 4 for a photographic material is arranged on the opposite side of the insertion opening of the pair of rollers 3, and the guide groove 4 is installed to be rotatable about a shaft 5. The shaft 5 is arranged parallel to the axis of the pair of rollers 3 or the axis 6 of the winding core 7. Further, the shaft 5 is disposed near the pair of rollers 3, and the entrance side of the guide groove 4 having the funnel-shaped expansion 4a is supported on the shaft 5. A chain member 9 is attached to the outer wall of the outlet side 8 of the guide groove 4.
is fixed, and the length of the chain village is at least 7 cores.
It has a length that goes around the guide groove 4 and reaches the inner wall on the outlet side 8 of the guide groove 4. A magnet 10 is installed on the side surface of the end of the chain member 9, and the magnet is attracted to a metal winding frame 11. The winding frame 11 is connected to the winding core 7 via a freewheel 12 in the following manner, that is, the winding frame 11 is connected to the winding core 7 by rotation in the winding direction. In the unwinding direction, the winding frame 11 is stopped relative to the cassette by the action of a second freewheel. Furthermore, as can be understood from FIG. 2, a flange 4 is formed on the winding frame 11, and the chain material 9 is supported by the flange 4 at the capture position (position at the beginning of winding), and in that case, the chain material 9 and An annular groove 15 is formed between the core and the core. A similar flange 6 is preferably formed on the cassette cover la, so that the chain 9 is supported on both sides. Inside the cassette case, another restriction member lb is installed outside the winding frame 11, thereby preventing the chain member 9 from jumping out above the edge of the winding frame.

The operation of the winding device explained based on FIGS. 1 and 2 is as follows.

First, the winding core 7 is rotated clockwise together with the winding frame 11.

In this case, the chain material 9 is wound around the core 7 by the attraction of the magnet 10. Subsequently, the strip-shaped photographic material M is supplied to the cassette through the insertion port 2, the pair of rollers 3, and the guide groove 4. By tightly wrapping the chain material 9 around the winding core 7, the outlet side of the guide groove is directed in a direction in which it contacts the winding core 7 (that is, in a tangential direction). The inserted strip of photographic material is guided around the core and comes into close contact with the core. When the strip of photographic material is wrapped one and a half to two times around the core, the strip of photographic material is firmly held on the core and can be subsequently wound continuously. As the amount of winding increases, the chain member 9 moves outward, and in this case the magnet 10 gradually moves outward in a spiral manner. By tightly wrapping the chain 9 around the wound photographic material, the wound photographic material is easily braked, thereby allowing tight winding. When unwinding, the photographic material is pulled out of the cassette through a guide groove that is aligned with the thickly wound photographic material in the lattice direction.

In that case, the winding core 7 rotates counterclockwise and the winding frame stops relative to the cassette as described above. As a result, the chain member also remains at the outer peripheral position. Only by moving the guide groove 4 inward, the end of the chain material fixed to the guide groove is moved inward together with the guide groove. However, the magnetic end of the chain is still held on the outer periphery of the reel, so that no drag is generated during the unwinding step since the chain only rests on the wound photographic material. Of course, depending on the position of the cassette, the chain material may fall onto the wound photographic material due to gravity.

In order to avoid this, and to further improve the movement of the chain 9 in general, it is also possible to provide a number of magnets spaced apart on the side of the chain facing the bobbin 11. These magnets ensure that the chain is always separated from the wound photographic material during unwinding. 3 and 4 show a second, simpler embodiment of the invention.

In this figure, the same parts as in FIGS. 1 and 2 are given the same reference numerals. A steel band 7 is fixed to the outer wall of the guide groove 4, and the length of the steel band is approximately equal to the circumference of the winding core 7.

As can be seen from FIG. 4, a sleeve 18 is attached to the winding core 7, and a ring-shaped magnet 19 is fitted into the sleeve 18. The width of the ring-shaped magnet 19 is approximately half the width of the sleeve 18, and rubber rings 2 are further provided on both sides of the ring-shaped magnet.
0 is iron-set into the sleeve 18. To explain the operation, first, when the winding D7 is rotated clockwise, the steel band 17 is attracted by the ring-shaped magnet 19 and wound around the winding core 7.

Therefore, the inserted strip of photographic material M reaches between the steel band 17 and the winding core 7, and is fixed after being wrapped around one and a half turns D7. When the photographic material is fully rolled up,
The steel bandeau 7 occupies the position depicted in dotted lines in FIG. When unwinding, depending on the position of the cassette, the steel band either falls back naturally towards the core, or it turns inward again by means of the guide groove 4 which moves onto the roll D.
As soon as the photographic material is completely removed from the cassette,
A magnetic force acts between the ring-shaped magnet 19 and the steel band 17 to fix the steel band 7 to the winding core 7. Of course, instead of a steel band, it is also possible to use a band of any other ferromagnetic metal.

It is also conceivable to use a flexible band, in which case it is sufficient to simply place a ferromagnetic layer on the band.
It is also possible to equip the flexible bandeau 7 with a magnet and to place a steel ring or a ferromagnetic metal ring on the sleeve 18. A third embodiment of the invention is illustrated in FIGS. 5 and 6, in which like parts are provided with like reference numerals.

In this embodiment, a flexible band 21 made of any material is provided, and the flexible band is fixed to the end of the outer wall of the guide groove. The band 21 goes around the winding core 7,
The band passes around the roller 22 installed facing the position where the band is fixed on the exit side of the guide groove 4, passes outside the guide groove, and then passes through the roller 23 installed near the insertion opening. It extends to a winding device 24, to which the other end is fixed. This winding device has, for example, a mainspring, which winds the band 21 in a counterclockwise direction, and when the winding of the core becomes large, it resists the biasing force of the spring. direction, thereby imparting tension to the band 21 and increasing its adhesion to the core of the photographic material. Also in this embodiment, the strip-shaped photographic material M is fed between the band 21 and the winding core 7 through the guide groove 4.

The coefficient of friction “e” between the first and second positions of the photographic material
When the Buddha Q" is sufficiently effective, i.e. when it has been wrapped around one and a half times, the capture step ends and the strip of photographic material M is held firmly on the winding core 7. While winding is taking place, the band 21 is unwound. 6, the diameter of the band increases. Due to the biasing force of the spring in the winding device 24, the band 21 always remains at the photographic material during the winding process. It comes into close contact and applies a brake to the rolled photographic material.Once the winding is complete, it is unwound in the opposite way.

However, it may be necessary to remove the photographic material, which is often fully rolled up. In the case of the first two embodiments, there is no problem because the chain material is simply moved to the side of the steel band, but in the case of this embodiment, both sides of the band are fixed, so in this case, the guide groove 4 Preferably, one end of the band fixed to the outer wall of the band is removably connected to the guide groove. This is made possible, for example, by forming a catch 25 on the outlet side 8 of the guide groove 4, on which a roller 26, which is rigidly connected to the band 21, can be hooked. To remove the fully wound photographic material, this roller simply needs to be released from the catch 25. A fourth embodiment of the present invention is illustrated in FIG. 7, in which an enlarged view of only the capture device around the core is illustrated.

An arc-shaped segment plate 27 is provided on the outer wall of the outlet side 8 of the guide groove 4.
A chain material 27 consisting of a to 27e is fixed. The segment plates 27a to 27e have a curvature approximately equal to the circumference of the winding core 7, and are connected to each other by links 28. The links 28 rotate the segment plates 27a-27e away from the winding core 7, but prevent two adjacently arranged segment plates from being rotated inward beyond their radius of curvature. A ring-shaped groove is thereby formed in the shape of the winding core. A spring element 29, preferably a bent spring, is provided at the link 28, which spring element 29 presses on the individual segment plates 27a to 27e and narrows the distance between the winding cores 7.

A pressure roller 31 is arranged at the outer end of the last segment plate 27e, and the pressure roller 31 is in close contact with the winding core 7. The inserted strip of photographic material M is first guided through the ring groove 30 and, after wrapping approximately once, passes under the pressure roller 31.

The photographic material is further wound up by the extrusion action between the winding core 7 and the pressure roller 31 and is held firmly on the winding core 7 after a frictional effect has been obtained as in the case described above. When the amount of winding increases, the guide groove 4 is pushed upward,
The chain material 27 expands against the biasing force of the spring element 29, and in this case the chain material rests on the photographic material wound up via the pressure roller 31. In FIG. 8, reference numeral 41 indicates the shaft of the photographic material winding cassette, and only a portion of the side wall is shown in the figure. A cylinder 43 is mounted on the shaft 41,
A paper cylinder 44 is detachably attached to the cylinder. The shaft 41 is driven by a known method to perform winding. For example, a guide groove 45 is provided so as to be in contact with the paper Tsukioka 44, and although the guide groove is not shown, it is arranged rotatably around the insertion opening of the cassette by a known method, and the guide groove 45 is arranged so as to be rotatable around the insertion opening of the cassette. It is possible to continue along the diameter.

A rigid support 47 is installed on the outer side of the guide groove 45, to which a spring plate 48 is fixed. The spring plate 48 is fairly thin, preferably having a thickness on the order of 0.3. The length of this spring plate 48 is designed so that it wraps around about 85% of the paper cylinder 44. Spring plate 481
Regarding this, on the opposite side of the paper 8 cars, the spring plate 48 is almost connected to the paper cylinder 44.
A second spring plate 49 is installed at a position tangentially touching the spring plate, and the second spring plate 49 is thicker than the first spring plate, and preferably has a thickness of 0.5 willow.

However, the second spring plate 49 only wraps around the paper cylinder by approximately 50%. The method of operating the winding device illustrated in FIG. 8 will now be described. The photographic material 4b enters the cassette from the cassette insertion slot, passes through the guide groove, and passes through the paper Tsukioka 4
4, the surface of the paper Tsukioka 44 has a large friction value against the paper, so it captures the paper.

In that case, this surface may be a layer of rubber or it may simply be provided with two rubber rings. Paper moon do 4
A thin spring plate 48 wrapped around the photographic material 4
6 is guided to the paper cylinder 44. If the first spring leaf 48 captures the photographic material 46, additional stiffness is provided by the second spring leaf 49. The spring leaves 48 and 49 warp as the turns increase, but the second spring leaf resists the stretching and deformation of the first spring leaf. When rewinding, the photographic material is pulled out of the cassette through the guide groove 45, which has moved in accordance with the amount of winding.

The wound photographic material then rotates in a counterclockwise direction, and the first spring plate 48 is so lightly wrapped around the photographic material that it hardly acts as a brake against rotation. In the embodiment shown in FIG. 8, the first spring plate and the second spring plate thicker than the first spring plate are used.
A spring plate is provided, which allows the first spring plate to securely capture the photographic material, and also prevents the first spring plate from deforming or sagging when the roll 0 of the photographic material becomes large, thereby ensuring reliable winding. This effect can be obtained.

Although the winding device according to the present invention has been described in relation to a cassette, the present invention is not limited to a winding device provided inside a cassette, but can be installed directly on a winding means, or can be installed in any type of winding device. It should be mentioned that the present invention can also be applied to a winding device.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a cassette showing a first embodiment of the device according to the present invention, FIG. 2 is a cross-sectional view taken along the Rolo line in FIG. 1, and FIG. A schematic cross-sectional view of a cassette showing the second embodiment, FIG. 4 is an enlarged cross-sectional view taken along the line W-N in FIG. 3, and FIG.
A schematic cross-sectional view of a cassette showing an embodiment of
7 is an enlarged sectional view of the volume D portion showing the fourth embodiment of the apparatus according to the present invention; FIG. FIG. 8 is a partially cutaway sectional view showing a fifth embodiment of the device according to the present invention. 2, 3... Lo-fu, 4... Guide groove, 7... Core, 9
...... Chain material, 10... Magnet, 11...
・Reeling frame, 12...Freewheel, 14, 16...Flange, 15...Ring groove, 17...Steel band, 18...Sleeve, 19...・・・
Ring-shaped magnet, 20...Rubber ring, 25...
... Clasp, 27a-27e ... Segment plate, 27 ... Chain material, 28 ... Link, 29.
... Spring member, 31 ... Pressing low-fu, 44
...Paper cylinder, 45...Guide, 47...Support, 48,4
9...Spring plate. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A winding device for a strip-shaped photographic material used in a light-shielding cassette, which is rotatably mounted on the inlet side and is movable so that the outlet side contacts the outer periphery of the core. A flexible band member 9, 17, 21, 27 is provided, which is connected to the outlet side 8 end of the guide groove 4, and the flexible band member is a band 21 loosely wound around the winding core 7. The free end of the band is connected to a winding device 24 which is located outside the winding space and applies a corresponding adhesion force to the photographic material as the diameter of the winding core increases. 7. A winding device for a strip-shaped photographic material, characterized in that when the winding becomes large, the winding takes place closely along the wound photographic material. 2. The band 21 extends to the winding device 24 via a roller 22 placed opposite the fixed end 26 of the band on the outlet side 8 of the guide groove 4. A winding device for a strip-shaped photographic material according to item 1. 3. The winding device for a strip-shaped photographic material according to claim 1 or 2, wherein the winding device 24 has a mainspring. 4. The band-shaped photographic material according to any one of claims 1 to 3, wherein the end 26 of the band 21 is removably fixed to the end of the guide groove. winding device.