JPH0119129Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a matching device for film feeding in a movie projector.

In a typical movie projector, it is necessary to sequentially stop each frame of the film to be projected at the aperture.

For this reason, many small-sized projectors employ a mechanism in which the perforation of the film is intermittently fed by a feed pawl that is reciprocated by a cam.

However, such an intermittent feed mechanism using a feed pawl generates noise because the feed pawl strikes the perforation of the film.

In addition, many large-scale projectors use a mechanism in which the sprocket is intermittently driven using a geneva stop or a grooved cam to feed the film wound around the sprocket. Since the oration is always engaged, the noise during operation is quiet.

However, in the case of film for small projectors, there is only one perforation per frame of the film, so there are various problems when using a sprocket to advance the film. The applicant of this invention previously filed a patent application for a device that solves these problems and allows smooth film feeding using a sprocket even in a small projector. (Patent Application No. 17842 of 1981) When the film is fed by such a sprocket, if the perforation of the film is not properly engaged with the pawl of the intermittent rotation sprocket, the film will be damaged if it is projected.

The object of this invention is to automatically and reliably engage the perforations of the film with the pawls of the intermittent rotation sprocket as described above.

In order to achieve the above object, this invention interlocks an interlocking plate that is interlocked with the operation of a film path opening/closing means of a movie projector and the film winding roller, so that the interlocking plate begins to move in the direction of closing the film path. At the same time, an interlocking means moves the film winding roller in the film winding direction, and after the film winding roller starts moving together with the interlocking plate, the loop forming roller is moved in the direction of the intermittent rotation sprocket, and the film perforation is moved. To provide a film matching device provided with an interlocking means for interlocking a film winding roller and an interlocking plate so that a loop forming roller is separated from the film after the film is engaged with a pawl of an intermittent rotation sprocket.

Since this invention has the above-mentioned structure, when the film passage is closed, the interlocking plate begins to move and at the same time, the film winding roller begins to move in the film winding direction.

Thus, while the winding roller is pushing the film toward the intermittent rotating sprocket, the interlocking plate begins to move the loop forming roller. Therefore, the film winding roller starts moving faster than the loop forming roller, approaches the intermittent rotating sprocket while pulling the film, and matches the perforations with the pawls of the intermittent rotating sprocket while shifting the film, and when the matching is completed, the film is removed. After the perforations engage the pawls of the intermittent rotating sprocket, the loop forming roller separates from the film to form a loop and projection begins.

An embodiment of this invention will be described below with reference to the accompanying drawings.

1 and 2, 1 is the main frame of the projector, 2 is the first guide roller, 3 is the first sprocket, 4 is the upper loop forming roller, and this roller 4 is the fulcrum on the main frame 1. It is attached to the tip of lever B, which rotates around A.

Reference numeral 6 denotes a lamp house, the front part of which is an aperture part 7, and a pressure plate 8 and a lens 9 are provided in the front part.

An intermittent rotating sprocket 10 for feeding the film is provided in a recess at the lower front of the lamp house 6.

12 is the lower loop arm, the upper end of which is connected to the shaft 1
3, it is rotatably attached to the main frame 1, and a lower loop forming roller 14 is rotatably attached to the lower end of this arm 12.

Reference numeral 15 denotes a shaft rotatably attached to the main frame 1, and a bell crank 16 is rotatably attached to this shaft. Pin 1 of
8 loosely fitted below the bell crank 16.
The lower end of the connecting rod 19 is connected to the tip of the piece facing backward, and the upper end of this connecting rod 19 is connected to the lever 5.

Reference numeral 21 in FIG. 3 is an arm that rotates together with the bell crank 16, and the lower end of this arm 21 is rotatably connected to the interlocking plate 22 by a pin. As shown in FIG. 3, this interlocking plate 22 has two prongs that fit into a cam 23, and this cam 23 is turned by a knob 24 rotatably attached to the main frame 1.

25 is a fulcrum shaft attached to the main frame 1 on the side of the interlocking plate 22, and the arm 2 is attached to this shaft 25.
The boss 27 of No. 6 is attached rotatably. Further, a pin 28 is fixed to the back surface of the boss 27 and is loosely fitted into the notch 29 on the lower side of the interlocking plate 22, and a tension spring 30 is stretched between a part of the outer periphery of the boss 27 and the frame 1. A rotational force is applied to the arm 26 in the counterclockwise rotation direction as viewed in FIG. 3, and a film winding roller 32 is attached to the tip of the arm 26.

Reference numeral 35 in FIG. 1 indicates a spring having a ring-shaped middle portion, one end of which is locked to a locking portion 36 of the frame 1, and the other end locked to a locking portion 37 of the arm 12. Further, a stopper 3 for restricting the rotation of the arm 26 is provided on the frame 1 near the attachment part of the spring 35.
8 will be provided.

In the above configuration, FIG. 1 shows a state in which the film passage is open.

At this time, the knob 24 is vertical, and the cam 23 moves the interlocking plate 22 to the left, that is, backward, as shown in FIG. 3, and the notch 29 pushes the pin 28 of the boss 27 to move the arm 26 forward as shown in FIG. The winding roller 32 is separated from the film 11, and the lever 5, which is connected to the bell crank 16 by a connecting rod 19, is also turned upward, and the upper loop forming roller 4 and the lower loop forming roller 14 move the film 11 to the aperture section. It's away from 7.

Therefore, the film 11 from the supply reel at the upper right side (not shown) in FIG.
It contacts only four rollers of a sprocket roller (not shown) and is wound onto a take-up reel (not shown).

In this state, the film can be loaded into the film path, the film can be fast forwarded, or the film can be rewound at high speed.

When the knob 24 is rotated clockwise from the state shown in FIGS. 1 and 3, the interlocking plate 2 is rotated by the action of the cam 23.
2 moves to the right, that is, forward.

This movement causes arm 21 and bell crank 16 to
rotate together about the shaft 15, the connecting rod 19 moves downward, rotates the lever 5 downward, and presses the pressure plate 8 against the film 11. These related mechanisms are known in the art.

Further, when the interlocking plate 22 moves forward as described above, the boss 27 pressing the pin 28 against the notch 29 rotates to the left together with the arm 26 due to the rotational force of the spring 30, and the winding roller 32 moves the film 11. Push towards sprocket 10.

On the other hand, when the bell crank 16 rotates as described above, only the elongated hole 17 moves and the pin 18 does not move at first.

During this time, the arm 12 is pushed by the spring 35 and does not move, maintaining the position shown in FIG.

After the pin 18 hits the end of the elongated hole 17, when the knob 24 is further rotated clockwise, the arm 12 moves to the axis 1.
Start rotating clockwise around point 3. When the arm 12 starts to rotate clockwise in this way, the spring locking portion 37 of the arm 12 also rotates along the arc centered on the shaft 13.
5 while compressing the shaft 13 as shown in Fig. 5.
A line passing through the locking portions 36 and 37 forms a straight line.
Until this state is reached, the spring 35 is working to rotate the arm 12 to the left, but when the locking part 37 passes the straight line connecting the locking part 36 and the center of the shaft 13 to the left in FIG. 35 is reversed, the arm 12 rapidly rotates to the right, and the lower loop forming roller 14 at its tip separates from the film 11.

Due to the above action, the film path is closed as shown in FIG. 2, the upper and lower loop forming rollers 4 and 14 move inward and away from the film 11, and the film 11 contacts the first sprocket 3 and forms an aperture. In section 7, one frame of film 11 is illuminated by a lamp in lamp house 6, and is projected onto a screen by lens 9.

At this time, the pressure plate 8 is
1 is pressed against the aperture portion 7 to stabilize the film 11, the film 11 is brought into close contact with the intermittent rotation sprocket 10, and the pawl of the sprocket 10 engages with the perforation of the film to be fed.

As mentioned above, when the knob 24 is rotated clockwise to close the film passage, the arm 26 moves and the film winding roller 32 at its tip pulls the film 11 while rotating the intermittent rotation sprocket 1.
However, the loop forming roller 14 gradually starts to move behind the movement of the winding roller 32 and loosens the film 11, so that the film 11 is wrapped around the sprocket 10 while sliding. Therefore, the perforation of the film 11 and the pawl of the sprocket 10 mesh accurately while sliding.

After the perforations of the film 11 are properly engaged with the pawls of the intermittent rotation sprocket 10, the loop arm 12 rapidly rotates and the loop forming roller 14 is separated from the film 11 to form a suitable loop.

Note that the movement mechanism of the interlocking plate 22 is a cam 23.
can be replaced with any mechanism other than rotation. In this device, when the film passage is closed by operating the knob as described above, the film winding roller starts moving faster than the loop forming roller, approaches the intermittent rotating sprocket while pulling the film, and shifts the film to perform its perforation. After matching with the pawl of the intermittent rotation sprocket and completing the matching and the perforation of the film is engaged with the pawl of the intermittent rotation sprocket,
Since the loop forming roller separates from the film to form a loop and projection starts, there is no risk of damage to the film due to mismatch between the pawls of the intermittent rotating sprocket and the perforation of the film.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing the main parts of the projector in each state, Figure 3 is a side view showing the cam operating mechanism, and Figures 4 and 5 show the operation of each roller. FIG. 7... Aperture portion, 10... Intermittently rotating sprocket, 14... Loop forming roller, 32... Film winding roller.

Claims (1)

[Scope of utility model registration request] A film passageway that can be opened and closed; an intermittent rotating sprocket that intermittently feeds the film in an aperture section in this passageway; a film winding roller that winds the film around an intermittent rotating sprocket when the film passage is closed;
An interlocking plate interlocked with the operation of a film path opening/closing means in a movie projector comprising a loop forming roller that holds the film away from an intermittent rotating sprocket when the film path is opened and forms a loop away from the film when the film path is closed. and,
interlocking means for interlocking the film winding roller to move the film winding roller in the film winding direction at the same time the interlocking plate starts moving in the film passage closing direction; After starting, the loop forming roller is moved in the direction of the intermittent rotating sprocket, and after the perforation of the film engages with the pawl of the intermittent rotating sprocket, the loop forming roller is moved in conjunction with the film winding roller so as to separate from the film. A film matching device equipped with interlocking means for interlocking the plates.