JPS6262343A - Projector - Google Patents

Abstract

PURPOSE:To prevent the applying of excessive force to a film by separating the linking of a roller to continuously send the film, retreating a sending claw to send intermittently and sending a film without fail, when the under-loop is detected. CONSTITUTION:A film 5 successively sent by an upper part sprocket roller 11 is sent to the projecting position, the film is sent intermittently by a film sending claw 61, the loop to adjust the continuous sending and the intermittent sending is formed by loop rollers 28 and 29, and through a lower part sprocket roller 22, the film is wound by a winding reel. A switch 53 detects the under- loop, and then, a lever 30 is shifted through a motor 35 in the A direction, the clutch linking of the roller 11 is separated and the sending claw 61 is retreated. Consequently, the film sending is executed without fail, the applying of the excessive force to the film and the useless sending can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a movie projector, and more particularly to one with improved film advance.

(Prior Art) FIG. 6 shows a projector known from Japanese Patent Publication No. 49-32347, etc., in which a film is automatically loaded.

In the figure, l is the projector body, 2 is the projection lens, 5 is the film on which images are recorded, and sprocket holes (hereinafter referred to as "perforation holes") are provided at regular intervals. 3 is the film book. 4 is a take-up reel that stores the film that has already been projected; 6 is a magazine that stores the supply reel 3 and take-up reel 4; 7 is a film that rotates counterclockwise around an axis 8; The guiding arm 9 is a light source for projecting the film 5, and is composed of a xeno 7 lamp, a reflecting mirror, and a combination lens.

Reference numeral 10 denotes a guide roller that applies tension to film No. 5 fed out from the supply reel 3, and 11 denotes an upper sprocket roller that engages with a sprocket hole in the film 5 to feed the film 5, continuously feeding the film 5t. Reference numeral 12 denotes a film pressing roller that presses the film 5'ft above the upper sprocket roller 1.

13 is an aperture plate that irradiates the film 5 with the light beam emitted from the light source 9; 14 is an aperture plate) 13
A pressure plate that clamps and presses the film 5 on the
The film 5 is loaded in a state ready for projection. These aperture plate 13 and pressure plate 14 constitute a film gate 26 for projecting the film 5.

The upper loop roller 28 and the lower loop roller 29 form a slack portion (hereinafter referred to as a loop). This loop is formed by the continuous feeding of the upper and lower sprocket rollers 11, 22 and the film gate 2 by the film feed pawl (not shown).
This is in harmony with the intermittent feed in step 6. The upper and lower loop rollers 28 and 29 are used to form a loop when loading the film 5, and are retracted during projection.

15 is a fixed roller, 16 is a flexible roller that presses against the fixed roller 15, and 17 is a sound drum for reproducing the audio optically or magnetically recorded on the edge 111 of the film 5, which is driven at a constant speed. Continuous feeding. 18 is an exciter lamp for the soundtrack, 19 is a light condenser for the exciter lamp 18, 20 is a pressure roller that presses the film 5 against the sound drum 17, 21 is a tension roller that applies tension to the film 5, and 221d. a lower sprocket roller that engages with a tin rocket hole in the film 5 to feed the film 5t; 23 a film pressing roller that presses the film 5 on the lower sprocket roller 22;
24 is a tension roller that adjusts the tension acting on the film 5; 25 is a fixed G that guides the film 5 to the take-up reel 4;
-A, 27 is an electric motor.

In the apparatus configured as described above, automatic loading of the film 5 is performed as follows.

First, the supply reel 3, the take-up reel 4t, and the magazine 6t to be stored are loaded in the positions shown in the figure, and when the automatic loading device is started, the power of the electric motor 27 is coupled, and the winding material is wound around the supply reel 3 in the magazine 6. The film holding device installed at the end of the arm 7 grasps the leading edge of the film, and the arm 7 rotates counterclockwise while pulling out the film from the supply reel 3 via the tension wrapping roller 6a, and the arm 7 rotates around the circumference shown in the dashed dotted line. The film is guided over 31.

Accordingly, the film 5 is placed on the outer side of the guide row 210 disposed approximately on this circumference 31, and the upper sprocket roller 1
1 and the film presser 12, between the aperture plate 13 and the pressure plate 14, between the fixed roller 15 and the 7-track roller 16, between the sound drum 17 and the condensing lens 19 for the exciter lamp 18, and also between the sound drum 17 and the pressure plate. Intermediate with roller 20, inside of tension roller 21, lower sprocket roller 2
2 and the film press 23, the inside of the tension roller 24, and the outside of the guide roller 25, respectively, to reach the winding wheel 4, and the leading end of the film is separated from the film holding device at the end of the arm 7 and wound. It is grasped by the cradle 4a of the take-up reel 4.

The arm 7 holds the leading edge of the film on the pedestal 4aiC as described above.
After being passed and rotated by a certain (minute) angle, it hits a stopper (not shown) and is locked by a locking device (not shown), causing the drive device to come off and stop.

This position corresponds to the starting position of the arm out of the film transport path.

Pressure drip occurred during automatic film loading)'14
, flexible roller/roller 16, pressure roller 20, tension roller, y roller 21. At startup, the tension roller 24 and the like are all moved to the position shown by the chain line in the figure, wait for the film to be guided, and as the tip of the arm 7 guides the film and passes, they are sequentially returned to the position shown by the solid line. do.

Furthermore, the upper sprocket roller 11, the lower sprocket roller 22, and the film feed pawl (not shown) are activated at the same time as the activation, and the circumferential speed of the film holding device at the tip of the arm 7 is controlled by the upper and lower sprocket rollers and the film feed pawl (not shown). If the film feeding speed is made slightly slower than the film feeding speed of the feeding claw, an upper film loop and a lower film loop are formed as the arm rotates, and the upper loop roller 28 and the lower loop roller 29 are separated from the film 5 during projection.

(Problems to be Solved by the Invention) However, such a device has the following problems.

(-If the film gate 26 is opened without the upper and lower loops, the film 5 will be fixed by the upper and lower sprocket rollers 11, 22, so it will be difficult to feed the film and excessive tension will be applied to the film 5.) As a result, the film 5 may be damaged.

(b) The film 5 may sag during high-speed rewinding, and the film 5 may come into contact with the film advance claw, damaging the film 5.

(→ During projection or high-speed rewinding, even if the film 5 is no longer present in the film gate 26, the film 5 continues to be fed, so even if there is no longer any need to feed the film 5, the film is wasted.

The present invention has solved the above-mentioned problems, and aims to realize a projector that can ensure film feeding and prevent unnecessary force from being applied to the film 5 and wasteful feeding.

Another object of the present invention is to realize a projector capable of fully automatically stopping film advance when the end of the film is detected.

(Means for Solving the Problems) The first invention to achieve such an object consists of an upper sprocket roller that continuously feeds out film from a supply reel, a film gate that projects the fed film, and a film gate that projects the fed film. A film feed pawl that provides intermittent motion to the film at the gate, a lower sprocket roller that feeds the projected film to a take-up reel, intermittent feed by the film feed pawl, and continuous feed by the upper and lower sprocket rollers. A loop roller that forms a loop on the film for adjustment, a sound drum that continuously advances the film at a constant speed, a film gate that closes when projecting the film, and a film gate that closes the film gate when loading or rewinding the film. A projector comprising a gate operating means for opening the gate, a loop detecting means for detecting the size of the film loop, a sprocket clutch for separating the upper and lower sprocket rollers from the driving means, and a sprocket clutch for separating the upper and lower sprocket rollers from the driving means, and a gate operating means for opening the film gate. a feed pawl retracting means for retracting from the feed pawl, and when the loop detecting means detects an insufficient loop, the tin lock clutch is disengaged, the gate operating means opens the film gate, and the feed pawl retracting means The feature is that the film advance claw is retracted.

A second invention that achieves these objects includes an upper sprocket roller that continuously feeds out the film from a supply reel, a film gate that projects the fed film, and an intermittent motion that is applied to the film in the film gate. A film feed pawl, a lower I-surge rocket roller that feeds the projected film to the take-up reel, and a loop attached to the film to adjust intermittent feed by the film feed pawl and continuous feed by the upper and lower sprocket rollers. a sound drum that continuously feeds the film at a constant speed, and a gate operating means that closes the film gate when projecting the film and opens the film gate when loading or rewinding the film. In the projector, the projector is equipped with a sprocket clutch for separating the upper and lower sprocket rollers from the driving means, a feed pawl retracting means for retracting the film feed pawl from the film gate, and detecting whether or not there is a film in the film travel path. and film detection means for detecting the film, and when the film detection means detects the absence of film during film projection or high-speed rewinding, the projection or rewinding is stopped, the sprocket clutch is disengaged, and the gate operation is performed. The present invention is characterized in that the film gate is opened by the means and the film feed claw is retracted by the feed claw retracting means.

(Example 9 The first and second inventions will be explained below using the drawings.

FIG. 1 is a perspective view of the main parts of an embodiment of the first invention, showing a film loading state. In FIG. 1, components K having the same functions as those in FIG. 6 are given the same reference numerals, and their explanation will be omitted.

In the figure, 30 is a lever that can be slid in the direction of the arrow;
A pin 31 and an oval hole 32 are formed. Reference numeral 33 is a fixed pin that guides the movement of the lever 3o.

A cam that drives the 34-bar Lz bar ao holds the lever 30 in the lowered state when projecting the film 5, and holds the lever 30 in the raised state when loading the film 5 or high-speed rewinding. 35 is a motor that drives the cam 34; 36 is a lever rotatably supported by a shaft 37 and rotated by the movement of the lever 30; gate operating means for opening and closing the film gate 26 by rotating the pressure plate 14 about the shaft 38; Configure.

Reference numeral 40 denotes a lever rotatably supported on a shaft 41, which rotates via a spring 42 in response to the movement of the lever 30.
Disengage the clutch of the upper sprocket roller 11 to connect and disconnect from the drive system. Similarly, the lower tin rocket 0-222 performs clutch operation via a lever (not shown) rotated by lever 30.

Reference numeral 50 denotes a lever that rotates around a shaft 51. The lever 3 degrees moves the upper loop roller 28 to form a loop when loading the film 5, and when projecting the film 5, if the loop is of a predetermined size, the film is 5 to a position where they do not touch each other. 52 is an angle that moves according to the amount of rotation of the lever 500, and 53 is a μ switch that is activated by the angle 52. When the upper loop of the film 5 becomes smaller and the upper loop 4-228 comes into contact and is pushed, the lever 50 is moved. The angle 52 moves through the .mu. switch 53'1. In addition, the lower loop roller 2
9 is also provided with a similar mechanism (not shown). These constitute loop detection means for detecting that the upper loop and lower loop of the film 5 have become smaller than a predetermined size.

60 is a bottle fixed to the pressure plate 14, 61
Reference numeral 62 denotes an arm supporting the film feeding claw, which rotates around a shaft 63'f. When the film gate 26 is opened in response to the operation of the lever 30, the film feed claw 61 is retracted from the film gate 26 in conjunction with each other, so these mechanisms constitute a feed claw retracting means.

70 is a lever that rotates around a shaft 71 and is driven by a pin 31 provided on the lever 30. Reference numeral 72 denotes a lever moved by the lever 70, which moves the lower loop roller 29.
to form a lower loop when loading the film 5. Reference numeral 73 is a buzz roller that aligns the horizontal soundtrack of the film 5 when producing the sound of the film 5.

80 is a guide roller provided coaxially with the upper sprocket roller 11 and freely rotatable;
1＠It has a tapered shape with a small end diameter. 81 is a guide roller provided on the lower sprocket roller 22;
2 is a guide roller provided on the sound drum 17;
It has approximately the same shape as the guide roller 80. The guide rollers 80, 81 and 82 facilitate the loading of the film 5, and when one film 5 starts running, the taper acts effectively and the film 5 is moved to the sprocket roller 11, 22.
is sent.

83 is a guide roller provided on the upper loop roller 28, and 84 is a guide roller provided on the lower loop roller 29.

The operation of the device configured in this manner will be described next. When the operator unwinds the film 5 from the supply reel 3 and guides it sequentially to the guide rollers 8G, 83, 84, 82, 81, the film 5 enters the projection position and the sprockets and perforations of the upper and lower sprocket rollers 11, 22 l. When the projector is engaged with the projector, a predetermined projection operation can be performed.

Next, the motor 35 is rotated by the projection signal, and the cam 34 is rotated to the projection position. Then, the lever 30 moves in the direction of arrow A, and the upper and lower sprocket rollers 11.
Driving force is transmitted to 22 via a clutch. The upper loop rollers 28, 29 are retracted from the film 5, and
The buzz roller 73 clamps and presses the film 5 onto the sound drum 17. At the same time that the film tension roller 13 applies tension to the film 5, the film presser roller 12
．． 23 are located close to the upper and lower sprocket rollers 11.22 to ensure engagement of the sprockets and perforations of the upper and lower sprocket rollers 11.22. As the film gate 26 closes,
The film feed claw 61 approaches the film gate 26 so as to engage with the perforation shutter.

FIG. 2 is a configuration diagram showing the clutch of the upper sprocket roller 11, with the figure showing the clutch in a disengaged state (the crane showing the clutch in a connected state, and partially shown in cross section. Components that have the same functions as those in FIG. 1 are designated by the same reference numerals t, and their explanations are omitted. In the figure, 43 is a toothed disk on the driven side having a trap formed at one end of the upper sprocket roller 11, and 44 is connected to an electric motor (not shown). The toothed disk 45 on the driving side that has been removed is stopped by a spring that provides a return force.

In the clutch configured in this way, when one switch 53 detects an under-circumflexion loop, the lever 30 is moved in the direction of arrow A via the motor 35. The spring 42 then overcomes the pressing force of the spring 45 via the lever 40 and disconnects the toothed discs 43, 44. When projecting the film 5, the lever 30 is moved in the direction of arrow B via the motor 35. Then, since the pressing force of the spring 42 is not transmitted to the lever 40, the toothed disks 43, 44 are connected by the return force of the spring 45.

Although this clutch is also provided on the lower sprocket roller 22, it may also be provided on the sound drum 17.

If a clutch is provided on the sound drum 17, there may be a delay in feeding the film 5 due to rotational inertia, resulting in a reduction in lower looseness.

FIG. 3 is an explanatory diagram of another embodiment of the first invention in which the sound drum 17 is provided with a brake as well as a clutch, and (4)
3 shows the projection state, and the river shows the state in which the brake is activated when the projection is stopped. In FIG. 3, the same reference numerals are given to the same functions as in FIG. 1, and the explanation thereof will be omitted.

In the figure, 74 is a shaft rotatably supported by a bearing 75, 76 is a friction disk fixed to the shaft 74 and has a friction surface on one side, 77 is a flywheel that stabilizes the rotation of the sound drum 17, and 78 is a flywheel. A friction surface 79 provided on the surface of the wheel 77 facing the friction disk 76 is a spring that applies a pressing force to bring the friction disk 76 and the friction surface 78 into close contact.

86 is a lever that moves the flywheel 77 in the direction of arrow C, 87 is a solenoid that moves the lever 86 in the direction of arrow C, and 88 is a spring that provides restoring force to the lever 86 so that it does not come into contact with the flywheel 77.

The sound drum 17 configured as described above operates as follows. Since the solenoid 87 is OFF in the projection state, the lever 87 is separated from the two-way wheel 77 by the spring 88. Therefore, the friction disk 76 and the friction surface 78 constitute a friction clutch, and the flywheel 7
7 and the sound drum 17 to connect the film 52i-
Send at a constant speed.

When the projection is stopped, the solenoid 87 is turned on and the lever 87 pushes the flywheel 77. Then, since the friction clutch is disengaged, the rotational inertia of the flywheel 77 is not transmitted to the sound drum 17, and the film 5 is not further fed.

This mechanism can also be used during rewinding and film loading, reducing the load during film feeding and protecting the film 5 from tension.

FIG. 4 is a perspective view showing the main part of an embodiment of the second invention. In FIG. 4, components K having the same functions as those in FIG.

In the figure, 90 is a detector roller for detecting the presence or absence of the film 5, 91 is a lever with the detector roller 90 fixed to one end and supported around a shaft 92, and an angle 93 is provided at the other end. 94 is a solenoid that moves the lever 91 up and down, 95 is turned on by the angle 93,
OFF switch, 96 is detector roller 90
a guide roller for guiding the film 5t in cooperation with 97;
is a spring that provides restoring force to the detector roller 90.

100 is a control circuit that inputs a signal from the μ switch 53.95, and 101 is a control circuit that controls the motor 3 in response to a command from the control circuit 1000.
This is a drive circuit that drives 5.

The operation of the device configured in this manner will be described next. When loading the film 5, the solenoid 94 is turned on and the detector row 79o moves downward. This increases the gap between the detector roller 90 and the guide roller 96, making it easier to load the film 5. When projecting film 5, the solenoid is turned off and the guide roller 96
The detector roller 90 is pressed against the film 5 guided by the restoring force of the spring 97. At this time p switch 9
5 is OFF. When the film 5 runs out and the projection ends, the detector roller 90 is moved by the spring 97, and the angle 93 turns on the angle 1 switch 95 via the lever 91.

FIG. 5 is a block diagram illustrating the operation of the control circuit 100. In the figure, s'wl is a loop detection switch 53. SW2 is a film end detection switch 95f
:represent. TMI is a timer that outputs a signal to stop projection, and TM2 is a timer that outputs a signal to open the film gate 26. 7M3 is a timer that operates when film 5 is loaded, and supply reel 3 is attached. A signal is input to indicate whether or not the Ql is a transistor that controls the stop operation, and Q2 is a transistor that controls the gate open signal.

When SWI detects the loop is too small, TMl increases the time width t
, generates a pulse signal. Then, the transistor Ql outputs a signal to stop the film advance, and the transistor TM2
generates a pulse signal with a time width t2 corresponding to the time delay required to disengage the clutch.

Transistor Q2 waits for a time t after stopping film feeding.
2 and outputs a signal to the drive circuit 101 to open the film gate 26t-.

When performing color projection without installing the supply reel 3, s
'w2 detects the absence of film 5, but 7M3 operates effectively and does not generate a pulse signal from TMI.

When the supply reel 3 is set and the film is projected, and the SW2 detects the end of the film, the 7M3 causes the TMI to generate a pulse signal after a predetermined time has elapsed.

In this way, since the film advance is automatically stopped when the end of the film is detected, the operator does not need to be near the atmospheric pressure projector.

(Effects of the Invention) As explained above, the present invention provides the following improved film feeding effects.

(1) Since the loop detection means detects that the upper and lower loops have become too small, the sprocket clutch is disengaged and the film gate 26 is opened, allowing the upper and lower tin rocket four-ra 11 and 22 to freely feed the film. Therefore, excessive tension is not applied to the film 5.

(b) Since the film advance claw 61 is retracted during high-speed rewinding, the film 5 is not damaged by the advance of the film 5.

(e) Since the end of feeding of the film 5 is detected by the film detection means, the film is automatically stopped without unnecessary film feeding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the first invention;
Fig. 2 is a configuration diagram showing a sprocket clutch, Fig. 3 is an explanatory diagram of another embodiment of the first invention showing a clutch for a sound drum, and Fig. 4 shows an embodiment of the second invention. A perspective view of the main parts; Figure 5 is a block diagram of the control circuit; Figure 6 is a block diagram of the control circuit;
The figure is an explanatory diagram of a conventional device. 3... Supply reel, 4... Take-up reel, 5... Film, 11... Upper sprocket roller, 17...
・Sound drum, 22...Lower sprocket roller, 26...Film goo), 28.29...Lublow? , 30... Lever, 34... Cam (gate operating means), 43.44... Sprocket clutch,
53...p switch (loop detection means) 61...film feeding claw, 95...p switch (film detection means). As shown in Figure 1, 2nd section (A) (B) 3rd (A) (B)

Claims (3)

[Claims] (1) An upper sprocket roller that continuously feeds out the film from the supply reel, a film gate that projects the fed film, a film feed claw that provides intermittent motion to the film in this film gate, and a film feed claw that moves the film that has been projected. a lower sprocket roller that feeds the film to the take-up reel; a loop roller that forms a loop in the film to adjust the intermittent feed by the film feed pawl and the continuous feed by the upper and lower sprocket rollers; and a loop roller that continuously feeds the film at a constant speed. Detecting the size of a film loop in a projector equipped with a sound drum for feeding and a gate operating means that closes a film gate when projecting a film and opens the film gate when loading or rewinding a film. Loop detection means; a sprocket clutch for separating the upper and lower sprocket rollers from the driving means; and a feed pawl retraction means for retracting the film feed pawl from the film gate, wherein the loop detection means detects an insufficient loop. In the event that
A projector characterized in that the sprocket clutch is disengaged, the film gate is opened by the gate operation means, and the film feed pawl is retracted by the feed pawl retracting means. (2) When loading a film or during high-speed rewinding, the sprocket clutch is disengaged, the film gate is opened by the gate operating means, and the film feeding pawl is retracted by the feeding pawl retracting means. The projector described in paragraph 1. (3) An upper sprocket roller that continuously feeds out the film from the supply reel, a film gate that projects the fed film, a film feed claw that provides intermittent motion to the film in this film gate, and a film feed claw that moves the film that has been projected. a lower sprocket roller that feeds the film to the take-up reel; a loop roller that forms a loop in the film to adjust the intermittent feed by the film feed pawl and the continuous feed by the upper and lower sprocket rollers; and a loop roller that continuously feeds the film at a constant speed. In a projector equipped with a sound drum for feeding, and a gate operating means that closes a film gate when projecting a film and opens the film gate when loading or rewinding a film, driving the upper and lower sprocket rollers. a sprocket clutch for disengaging the film from the film gate; a film feed claw retracting member for retracting the film feed claw from the film gate; and a film detection means for detecting whether or not there is a film on the film travel path. When the film detection means detects the absence of film during high-speed rewinding, projection or rewinding is stopped, the sprocket clutch is disengaged, and the film gate is opened by the gate operating means;
A movie projector characterized in that the film feed claw is retracted by the feed claw retracting means.