JPS61184525A - Camera with film leader retainer means - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application] The invention relates to an amiri still camera which is provided with an opening/closing door for film loading on the surface thereof, and particularly relates to an amiri still camera which is provided with an opening/closing door for film loading. The slit internal pressure film leader installed on the shaft is configured so that it will not come off when the take-up S is rotated. , the rotation angle of the winding shaft.

[The problems that Seimei's technology and inventions aim to solve] A number of electrically driven millimeter cameras have been proposed that allow for easy and quick film loading. One of them is U.S. Patent No. 4.416.
．． There is No. 525. In this case, the take-up shaft is not provided with a slit, and instead one or two or more hooks for engaging the film are slightly protruded in the radial direction. The hook is configured so that the above hook engages with the leader of the film, which is moved 9 degrees above the winding shaft by a motor-driven rocket through a slip clamp. , the hook of the take-up shaft protruding into the slit was set in the film and could not be successfully engaged with the half-oration.
When loading the film, it was necessary to carefully check whether the film leader was inserted into the slit of the take-up shaft, as the film may not be able to be scraped. Depending on the structure of the patent,
That q9 distribution is gone. As mentioned above, the reason why the film and the hook do not fit well is that the positional relationship between the slit and the hook is poor, and their shape is not suitable for fitting with the film leader.Furthermore, In the above patent, in order to allow the hook to come off smoothly without damaging the film when rewinding the film,
The take-up shaft is driven at a speed slightly higher than the rewinding and reversing speed of the cassette to feed the film to the positive side.

However, when one of the purposes is to reduce the cost as in the present invention, the above patent does not allow the user to save the user's effort of inserting the film lead into the slit of the take-up shaft. . However, the present invention uses a lower cost mechanism to ensure engagement between the take-up shaft and the film leader. Another conventional technique for making the engagement between the winding shaft and the film more precise is to provide an abrasive coating such as synthetic rubber around the winding shaft, and to use a guard gate and a feed shoe. In some cases, the film fed out at the beginning of the film leader's forward movement is placed on the roll M11.4iIli in a small amount. Both of these methods were more complicated than the previous methods in which the film was inserted into a slit provided at a predetermined position on the winding shaft, leading to higher costs.

Although not an essential element of the present invention, in the case of a motor-driven camera as in the above patent, a tension-sensing film advance control means is provided to prevent the tape tension applied to the take-up shaft from rapidly increasing at the end of the film. Detected by appropriate means,
One configuration can be used to either stop the film from advancing or to automatically switch the camera to rewind so that the film is automatically rewound into the cassette. In such a tension sensing method, a considerable load is applied to the winding shaft driving yarn and the winding shaft itself, so the winding shaft must have sufficient strength to withstand the load. For this purpose, if the winding shaft is formed by resin molding as a simple, strong, and compact unit so as not to absorb strain caused by tension, breakage due to load can be prevented.

Not used for guide shoes and related parts'r%,
Even a prisoner in the dark can easily load film.
An inexpensive film stop mechanism for bank-rotating type arm and force 40, which has a strong and inexpensive unitary structure that can withstand high loads even though the winding shaft has a small diameter. This is the only one I've ever seen.

[Determined means of determining the shortcomings]

The camera according to the invention uses a motor-driven dJJ winding shaft having a relatively wide film engaging slit and a film securing hook provided within the slit, The present invention is characterized in that it is driven by a motor and is provided with means for correcting the rotational position t of the winding shaft so as to set it at the storage position for engaging with the leader of the slit χ film.

Preferably, a motor is used for winding and rewinding the film.
It is preferable to use this motor to automatically set the take-up shaft to the best rotation angle in response to opening the rear door of the camera when loading film. For this purpose, a position-sensitive switch means is used for the winder rMK, and this switch means drives the motor in conjunction with a switch activated in response to the opening of the back door, and rotates the winder to a predetermined rotation angle. It can be configured to do so.

A more specific embodiment of the invention employs unique dimensions and shapes for the slit in the take-up shaft.

That is, in the earlier American Congregation 1% Application No. 477.247 filed by the present applicant, the winding shaft has a hollow cylindrical shape with a thin outer circumferential wall, a narrow slit is provided in the outer wall, and the hook is inserted into the slit. In contrast, in the present invention, each slit is made wider, and the proportion of the length of the hook protruding into the slit is reduced. In addition, the winding shaft is formed into a hollow cylindrical body with a wall thickness of 8 years, as will be detailed later.
A unique arrangement and structure of the hook can be selected, and the winding shaft is made 4S so as to maintain sufficient strength when the camera trap film tension response means is turned off as described above.

For example, the idea of using a means to set the take-up shaft at the correct rotation angle by means of a motor drive in response to the opening of the film presentation door was proposed by the applicant on March 21, 1983.
Date Yoneyama % approval M compilation 477.247-@ shown 1
There is. The present invention relates to a half-frame type camera, in which the film cartridge and the film zero leader are attached to the end wall of the camera housing, unlike the conventional full e-frame camera. It is inserted through a narrow opening, and the user does not have to touch the film leader after inserting the cartridge into the camera. In the case of the above-mentioned camera, the entire slit of the take-up shaft is exposed for the convenience of the user, who inserts the film reader into the slit that opens at one axial end of the take-up shaft. There is no configuration. This is because when the %J&@ is in the correct angular position, the film leader engagement slit will automatically align with the opening in the camera extrusion end wall, and the film leader will open when the film is inserted into the camera. This is because it is guided by this and guided into the slit of the winding shaft. Therefore, in this configuration, there are no variable winding shaft positioning means (T=7). Thus, the above-mentioned application discloses the use of automatic means for setting the take-up 44II in a predetermined position, i.e., in a position where the slit through which only the waste is visible is flush with the surface of one end of the film leader. However, this does not necessarily mean that the slit in the take-up shaft and the film leader can be seen in their entirety, indicating that similar automatic positioning means can be used in cameras configured such that they can be touched.
It's not like it's being urinated.

In a preferred arrangement of the present invention, when the film storage door is fully opened, the take-up shaft is automatically set to the nearest rotation angle.

Therefore, the user can simply fit the cassette into the cassette storage chamber and insert it into the slit at the tip Y of the film leader: the winding shaft, and there is no need to worry about asking for special assistance from other parties. When the door is closed, the inner surface of the door presses down on the film leader, and the take-up shaft takes up the film (advance).
At the same time as you start rotating in the direction, hold the film in a state where it is not engaged with the hook. To advance the film, close the door Z, and then release the shutter.
Button operation? 1: is performed.

[Implementation row]

Hereinafter, the present invention will be described in detail with reference to cold drawings.

FIG. 1 shows an rsIL-recommended camera to which the present invention is applied. , a film advance amount measuring sprocket (equipment), a predetermined push button ratio that operates the shutter 't' and automatically advances the film by a motor drive means (not shown), and a film leader from above the take-up shaft η. and a film end switching member blade for turning off the motor drive means when the film is returned.

The long side of the camera 10 has a - side end that rotates as a rotation axis,
A door 14 is provided which closes the film holder s when it engages with the latte 13, and the door 14 is formed with a known suppression plate for holding down the film before closing. There is. A switch actuating member 32 is disposed on the housing and is actuated by engaging a protrusion 38 or a step cutout when the door 14 is opened or closed. By combining the upper switch with a known switch reset means, the electric circuit Tt of the camera (not shown) can be switched from a rewinding state to a forwarding state in response to opening or closing of the door 14. switch! is similarly activated by opening and closing the door 14, activates a drive circuit specially provided for driving the capillary skin, and opens the film leader retaining slit 24Va, which is truly apocryphal, in preparation for the next film loading. It is now possible to use tg.

In the illustrated row, the winding shaft consists of a thick-walled cylinder .rho., and has a leader retaining slit (24t) which is wider than the conventional one. Figures 2 and 4B show the state in which the slint and the locking hook 3 are engaged with the film in stages. Prisoner 4A shows the slit in the correct position for loading film. FIG. 4B is a partial plan view of the winding shaft in a state where the slints are in almost the same position as in the MJA diagram, that is, in a position turned around the housing ratio. The slintos is formed slightly longer than the width of the leader tip of the standard film 62, so that when the end of the film is inserted into the slit 24, the perforation barbs 64 of the film can meet properly after the hook. Shape of slit, slit and guide rail 20
(See FIG. 1) In particular, the following configuration is adopted regarding the relationship with the horizontal plane. That is, 1141 out of 58 pairs of longitudinal hooked edges defining
One edge is cut with a slant close to the center of rotation of the winding shaft, has a width approximately equal to the thickness of the relatively thick outer wall of the winding shaft cylinder ρ, and is used as a large wall. 111Il The edge of the winding shaft is cut with a green line that passes through the center of rotation of the winding shaft, and the outer circumference of the winding shaft.
Used as a facing guide wall. This guide wall side is also inclined with respect to the surface of the film leader that engages with the groove, and until the film advances, the guide wall side is in contact with the film except for its inner tip. Both the lead-in wall and the east inner wall are connected to the film leader receiving cFJ which is defined by the inner wall mark in the take-up shaft cylinder η.

The first group of guides will introduce or advance the -1L film,
That is, it has a hook 26ya extending in the direction of rotation of the winding shaft. The outer circumferential surface 26a of the hook is continuous with the outer circumferential surface of the winding shaft, and extends radially from its tip (there is a film perforation locking angle 26b between it and ig26c).
' is defined. As shown in FIG. 413, that corner 526b of the hook is within the frame of the slit and projects slightly to the right 4a from the tip of the guide 1. In the North 4C view, the film leader is further advanced than in Figure 4B and engages either the hook or one of the copperforations.

At this point, the film is still on guide rail 20! 5! t, the door 14 is in a tilted state, and the radially outer end of the guide 1 is not yet in contact with the film bottom. Fifth
The reason for this is shown in detail from the winding shaft 21' at the stage of engagement between the slit and the film leader in FIG.

Diagram M4D shows the relationship between the film roll and the take-up shaft when the film moves forward a little, and the guide wall 58 is in contact with the film shaft over its entire width.

That is, the film is fully engaged with the hook and is in contact along the entire wall surface on the guide wall side. The wall thickness of the take-up shaft cylinder is relatively thick and has a considerable mechanical strength. If the wall thickness is not sufficient, the guide walls 58 cannot be formed at a sufficient angle as shown in FIG. 4C, and must be formed at an angle similar to that between the introduction walls. In that case, the film will easily fall off the hook, resulting in damage to the film.

The interrelationship between the entry wall and the guide wall, as shown in Figure 4B, ensures that the film leader remains firmly engaged with the slit even if the insertion angle of the film leader varies over a fairly wide range. It's all about matching. That is, the permissible range of the kth position where the take-up shaft ρ first engages with the film can be expanded without damaging the integral structure of the take-up shaft. In addition, due to the mutual relationship between the two walls, 58, it is possible to make the connection area between the hook and the guide wall much larger than the thickness between the inner and outer walls of the winding shaft. The strength of the hook can be increased compared to the case where the hook 26 is provided only in width equal to the wall thickness.

As the winding shaft positioning means mentioned above, as shown in FIG.
A notched cam 42 and a sensing blade 50 are used. On the winding shaft ρ, a known bearing (not shown) and a mounting shaft 46 each connected to a drive device are fixed, and a notch cam is attached to one end. The notch cam 42 has a notch 48 formed by cutting inward into a fan shape in a part of its periphery, and a sensing blade I having an appropriate engagement S is slidably engaged with the periphery of the notch cam. As the winding shaft ρ is rotated by the motor, it is guided by the cam string and oscillates. A sensing contact piece 52 is arranged to rotate with the sensing blade group, and both constitute two terminals of switch S2 in FIG. 3. Winding shaft η
When the sensor rotates, the sensing blade (capital) and the sensing contact piece 52 come into contact and close an electric circuit, and then the winding shaft rotates further and reaches the position shown in FIG. 1 (and FIG. 4A). When this happens, the sensing blade moves away from the sensing contact piece due to its elasticity, and the circuit opens (.

FIG. 3 shows a slightly modified version of a known motor-driven film advance control circuit as a series of circuits for manually resetting the position of the winding shaft n when the door 14 is opened after film winding. It shows. 5v of this circuit :),
The film advance control circuit (FACC) is a well-known one, and is connected to the pushbutton 13ya' as a driving source, and operates the relay coil FL' in response to the switch S3.
a'4mLI T2r: It is designed to operate for a predetermined time through the relay coil I (from the relay coil I to the battery B on the opposite side. T6'v is configured. The movable contact piece C of the connection system is connected to the switch s4
Motor M″Ir connected between terminals A and C of : It is preferable to interrupt the forward movement of the film, or to supply the motor MK storm force from the panteri B when the contact piece C'b'' contacts the terminal B.The direction of rotation of the motor can be controlled by: This is performed by a polarity reversal switch PR5 that changes according to the internal switching state of the film advance control circuit BFACC.Film advance control circuit FA
The CC is reset to the forward state by known means in accordance with the respective states of the film end detection switch, which is paired with the switch member 31 of FIG. 1, and the door drive switch, which is paired with the door drive switch member. Incidentally, as a method for appropriately reversing the motor drive polarity via the polarity switch PR3Y in accordance with the switching states of these switches, any known means can be used for this purpose as well.

In the present invention, by using a film front over control circuit designed to set the polarity reversing switch PR8' to the forward polarity as much as possible, the switch member can be used even if the camera e-door is opened several times after rewinding. is connected to this switch 5l)a-closed. If the slit 24 (1g21g) is not at the correct position tIjL, switch S2 corresponding to the sensing blade group and the sensing contact piece
is closed, therefore, one end of the coil of Rin-R is grounded, and the relay is driven to bring the movable wall piece cr terminal Btt into contact. This causes the battery B to supply power to the motor MK. The shaft is motor-driven in the film advance direction at the f2tl seat and rotates until the notch blade of the cam disengages the sensing blade 50 from the sensing position, that is, until the slit 24 is in the correct outer position. When the sensing blade and the sensing contact piece 52 are separated, the circuit is closed, the motor drive is stopped, and the winding shaft is returned to its rotational position.

that's all,! Ami IJ with Ik side door ('! 7.-
(Similar) In order to load the film into the camera securely, the film is advantageously configured with a small diameter take-up shaft, which eliminates the above-mentioned drawbacks of the conventional technology: 1. Convenience and cheapness 1.
I mentioned one thing about the 1111 mechanism. In addition, by automatically setting the slit on the take-up shaft to the most suitable position for engagement with the film leader, the slit's both ends and the locking hook can be adjusted to the optimal position. By designing and arranging the shape and position, the drawbacks of the conventional technology are clearly erased.
A reliable and inexpensive machine #l can be provided.

Although the above explanation has been made based on the implementation sequence, it goes without saying that various modifications and changes can be made to this pond within the scope of the present invention. For the positioning switch, instead of what is shown in the drawings, any intermediate sensing stage, such as a commutator type switch, an electrical sensing switch, an optical sensing switch, etc. provided at an appropriate position can be used. In addition, in the above-mentioned embodiment, by operating the motor drive circuit for a single time, in response to the switching circuit activated by the opening of the front door of the camera, the take-up axis is rotated in the 11111 direction, that is, in the film advance direction. Rotate only the amount of KL”
(However, it is clear that other similar circuits responsive to actuation of the film end sensor to stop rewinding may be used.Alternatively, the rear door lock t
The rotational position of the winding shaft may be corrected by a door lock release button in conjunction with the switch means. Furthermore,
A switching circuit can also be provided so that even after the film has been rewound and removed from the winding shaft, the winding shaft continues to rotate in the unwinding direction and is set in the correct rotational position. In other words, in order to rotate the take-up shaft and set the slit to a position ready for loading the next film, there are some things that respond to the film end, things that respond to various operations associated with opening the back door of the camera, etc. Various switching means are available.

[Brief explanation of drawings]

The first problem is a perspective view of the camera according to the present invention, in which the film is inserted from the back side, the front door is open, the film has not been inserted yet, and the film engagement slit on the winding shaft is closed. Figure 2 shows the take-up shaft of Figure 1 and the notch provided in the take-up shaft to rotate the feeler switch according to its rotation angle. 3 is a partial perspective view showing the cam, and FIG. 3 shows that when the front door of the camera is opened as shown in FIG. 1, the electric motor drive means is operated to automatically correct the rotation angle of the winding shaft. -1+11' of the circuit to do
FIG. 4A is a circuit diagram showing the camera shown in FIG.
Fig. 4D is a longitudinal sectional view taken along the line A-4A, showing the winding shaft at the correct rotation angle for film loading; This shows that the film leader is not yet engaged with the film leader.The fourth C is similar to Figure i4B, and the film leader is lightly resting on the take-up shaft before the rear door of the camera is closed. Fig. 4D is the same as Fig. 4C, and shows that the take-up shaft has begun to rotate a little in the film advancing direction, and Fig. 5 is the state of Fig. 4B. It is an enlarged view showing the take-up shaft and film leader in the figure. lO...Camera, Lu...Camera Hawazing, 14
...Back door, section...take-up shaft, prisoner...slit,
26...Hook, string...notch cam, group...sensing blade, 62...film. Registration Applicant W Haking Enterprises Limited Agent Patent Attorney Wednesday 1) Takesanbu Proceedings Amendment Amount Ending in Showa I

Claims (14)

[Claims] (1) A housing defining a film storage section including a cassette storage chamber on one side of the imaging area of the camera for storing a film cassette from which a perforated film leader extends; It includes film guide means that are provided opposite to each other and that press the film flat, and a take-up chamber that is provided on the other side of the mapping area and has a take-up shaft therein, and the take-up shaft has a take-up shaft. A slit for inserting a film leader,
A hook is provided for engaging with the perforation of the film leader inserted through the slit, and the take-up shaft is rotatable to the best rotation angle for the hook to engage with the perforation of the film leader, Furthermore, a door for opening and closing the film storage section is provided, and when the door is opened, a portion between the cassette storage chamber and the winding shaft is sufficiently opened for insertion of the cassette and the reader, and the door is opened. When you close the
The film is pressed flat against the film guiding means, the winding shaft is driven at least in the film advancing direction by the motor drive means to move the next frame to the imaging area, and the film is moved by the rewinding means. In a still camera in which winding is carried out from the winding shaft into the cassette, a switch means responsive to the rotation angle of the winding shaft is provided, and when the winding shaft is not at the optimum rotation angle, the motor drive is switched off. A still camera characterized in that said means is configured to temporarily drive said take-up shaft to set said take-up shaft to said optimum rotation angle. (2) The switch means is interlocked with the door to energize the motor means, and when the take-up shaft is not at the optimum rotation angle, the take-up shaft is moved to the optimum rotation angle in response to opening of the door. The first claim characterized in that
Section still camera. (3) The switch means includes a cam means that rotates together with the winding shaft, and the cam means opens and closes the switch means according to the rotation angle of the winding shaft. Still camera in item 1. (4) latching means for locking the door in a closed position;
The switch means drives the motor means in conjunction with the latch means, and when the take-up shaft is not at the best rotation angle, the take-up shaft is moved to the best rotation angle in response to release of the door of the latch means. The camera according to claim 1, characterized in that: (5) The winding shaft has a hollow portion extending in the axial direction, and the slit is an axially long passageway that communicates the hollow portion with the outside, and the passageway is formed by two opposing parts separated by a relatively large distance. 3. A still camera according to claim 2, characterized in that it is defined by a pair of axial side edges. (6) The still camera according to claim 5, wherein when the take-up shaft is at the optimum rotation angle, the slit substantially faces the imaging area and the film guiding means. (7) The winding shaft has a cylindrical outer circumferential surface, and when the winding shaft is at the optimum rotation angle, the side edge of the passageway in the axial direction is farther from the mapping area. intersects the outer circumferential surface of the winding shaft at a nearly right angle, whereas the side edge closer to the mapping area intersects with the outer circumferential surface at an angle, and is greatly inclined from the plane passing through the center of the winding shaft in the radial direction. 7. The still camera according to claim 6, wherein the still camera has a surface facing outward, and a protrusion is formed on this inclined surface to serve as the hook. (8) The hook has an outer circumferential surface that is continuous with the cylindrical outer circumferential surface of the winding shaft, and a surface that extends radially inward from the tip thereof, and both surfaces intersect and face in a direction opposite to the mapping area. 8. A still camera according to claim 7, further comprising a perforation engaging corner defined by the perforation. (9) When the take-up shaft is at the best rotation angle, the hook protrudes from the side edge of the slit that is closer to the mapping area, and the film perforation engaging corner provided on the hook projects into the mapping area. 7. The still camera according to claim 6, wherein the still camera faces in the opposite direction. (10) Among the side edges of the slit, when the take-up shaft is at the best rotation angle, the side edge closer to the mapping area contacts the film at the start of forward movement only at its radially inner corner. The still camera according to claim 9, wherein substantially the entire side edge is formed to come into contact with the film. (11) The still camera according to claim 1 or 2, wherein the take-up shaft has a single axial slit. (12) a film take-up shaft provided adjacent to the imaging area of the camera and having at least one slit for passing an end of the film leader therethrough, the slit being set in a predetermined orientation; In the still camera having means for rotating the take-up shaft, the take-up shaft has an axially long hollow part and an axially long passage communicating the hollow part with the outside. is defined by a pair of side edges separated by a relatively large distance, and of the side edges,
When the take-up shaft is in the predetermined orientation, a hook extending in the forward rotational direction of the film is provided on the side edge closer to the imaging area, and the hook extends in the forward rotation direction of the film after the hook locks the film. A still camera characterized in that it is configured such that only its radially inner corners contact the film at the beginning of its forward movement, and thereafter substantially the entire wall surface of its side edges engages with the film. (13) The still camera according to claim 12, wherein the take-up shaft has a single axial slit. (14) a housing defining a film storage section including a cassette storage chamber on one side of the imaging area of the camera for accommodating a film cassette from which a perforated film leader extends; A steel film comprising film guide means which are provided to face each other and press the film flat, and a winding chamber which is provided on the other side of the mapping area and has a winding shaft therein.
In a camera, means for rotating the take-up shaft so that the hook is in a position where it is easy to engage with a perforation of a film leader at least when the opening/closing door of the camera is opened and the film storage section is exposed. A still camera characterized by being equipped with.