JPS5831137Y2 - projector - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a movie projector.

In conventional movie projectors, the supply reel was held by inserting the reel shaft at the upper end of the protruding support arm into the hole in the center of the supply reel and tilting the stopper at the tip. In the case of a type in which a large number of supply reels are installed at once and the images are projected one after another, the structure becomes complicated and the volume becomes large.

Furthermore, since a drive device for rewinding the film is provided for each reel shaft, the structure becomes more complicated and the volume of the supply reel holding section increases.

The purpose of the present invention is to eliminate such conventional drawbacks, and its feature is that a large number of supply reels are arranged in close parallel arrangement along the outer periphery of the pedestal, which is approximately circular in plan view. The mount is mounted on the projector body so that it can rotate intermittently one pitch at a time around a vertical axis, and one roller near the back of the mount supports and winds the reel. The rewind drive device is also used as a return drive and is brought into contact with and rolled against the outer circumference of the reel, and furthermore, the rewind drive device consisting of a drive source, a swinging arm, a contact shaft, and a transmission mechanism is singular, and the drive device is The film is attached to the upper end of the projector main body in a protruding manner and inserted into the mount from below, and the film is pulled out from the one located above the gate part among the many supply reels, and the film is drawn out from the film on the projector main body. While passing through the gate section of the film, the film is projected by the projection lens, and the film is wound up by the take-up reel below. A solenoid is provided at an appropriate position during the feeding of the film and is activated by a signal from the sensing device,
The solenoid and the swinging arm are interlocked and connected via a link mechanism, and the drive roller and the contact wheel are separated during projection, and when the projection is finished, the contact wheel contacts the drive roller to drive the drive roller. The roller and reel are rotationally driven in the rewinding direction, and a single rewinding drive device is configured to sequentially rewind one reel out of a large number of reels.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

In FIGS. 1 to 6, a projector 1 is an example of a projector for a television camera, and has a box-shaped main body 2 on the lower side, and a mount 4 is mounted on the upper part so as to be freely rotatable around a vertical axis 3. has been done.

The supply reel 6 on which the film 5 is wound as shown in FIG.
It has a standard shape that does not use a cassette or magazine, and in a specific example, it has a slightly small diameter for short-second projection of TV commercials. Drive roller 8 and two idle rollers 9,
9 are rotatably abutted against each other, and the supply reel 6 is aligned with its axis 10.
A holding device 11 for the supply reel 6 is configured.

As shown in FIG. 1, a very large number of these holding devices 11 are arranged in rows along the outer peripheral edge of the pedestal 4, which is approximately circular in plan view, and in some cases, as many as 20 to 40 holding devices 11 are arranged in rows. ing.

Specifically, a vertical mounting plate 12 is provided in succession in the radial direction or slightly eccentric radial direction of the circular frame 4, and the rollers 8 and 9 are pivotally mounted to this mounting plate 12 directly or indirectly.

Then, as shown by arrows A and B, the supply reel 6 is pushed in and pulled out in a direction parallel to this mounting plate 12, and the holding device 11 is
It is said that it can be attached and detached.

At this time, the supply reel 6 is pushed in and pulled out by hand so that both sides 13, 14 are parallel to the mounting plate 12.

Reference numeral 15 denotes a contact disk that rotates around an axis that substantially coincides with the axis 10 of the reel 6. The contact disk 15 is pivotally supported by the mounting plate 12, contacts the side surface 13 of the reel 6, and rotates together with the reel 6. assists in smooth and stable rotation.

Further, in the specific example, the drive roller 8 is disposed on the back side of the push-in, and the idle rollers 9, 9 are disposed on the front side of the push-in. The roller 9 is pivoted to the tip of a swinging arm 17 which is resiliently biased downward and upward by a resilient member 16 such as the above. As a reaction force, the other rollers 9 and the driving roller 8 also press the reel 6, and in the end, the three rollers 8 and 9. To support.

In this way, a large number of reels 6 are arranged in close parallel arrangement and can be freely pushed in and pulled out approximately in the radial direction,
One roller 8 near the back of the pedestal 4 serves both to support the reel 6 and to drive the rewind.

In FIG. 2, 18 is a take-up reel, 19 is a gate part, and 20 is a projection lens, which are attached to the main body 2, and the upper mount 4 holds a plurality of supply reels 6 in parallel. The frame 4 is held by the device 11 and rotates around the axis 3 intermittently by l pitches to pull out the film 5 from the supply reel 6 that has come above the gate part 19.

It passes through the gate section 19 while being guided by a rocket 21 and rollers 22, is taken up by a take-up reel 18 below, and is projected by a projection lens 20 in the direction indicated by the arrow.

Thereafter, once the film 5 is completely unwound from the supply reel 6, a sensing device 2 as shown in FIGS.
3, this is sensed and the drive of the take-up reel 18 is stopped.

This sensing device 23 includes a guide roller 25 that rolls while guiding the film 5 and has two grooves 24, 24, a swinging arm 27 that is swingable around a support shaft 26, and a swinging arm 27 that is swingable around a support shaft 26. The film 5 is sandwiched between the guide roller 25 and the guide roller 25 .
a sensing roller 29 having both flanges 28.28 that roll together and fit into the grooves 24.24 when the film 5 is removed; It is composed of a switch 30 and the like.

That is, in the illustrations of FIGS. 3 and 6, when the film 5 is finished, both flanges 28 and 28 of the sensing roller 29 enter the grooves 24, 24, and the swinging arm 27 swings around the support shaft 26. This shows a state in which the other end of the swinging arm 27 is close to the proximity switch 30.

In FIG. 3, the swinging arm 27 is shown swinging counterclockwise.
The other end is slightly heavier and the proximity switch 30
is a well-known and commonly used one.

For example, the other end of the swinging arm 27 is made of magnetic metal, and the proximity switch 30 is freely selected from a high frequency oscillation type, a differential coil type using eddy current, a capacitance type, etc., and is mechanically brought into contact with the other end. Detects its approach without having to do so.

When the projection is finished in this way, the winding rule 18
The film 5 must be rewound onto the empty supply reel 6, but the drive roller 8 of the holding device 11 holding the empty reel 6 in a predetermined position is As shown in the figure, the contact wheel 32 of the rewinding drive device 31 selectively contacts the drive roller 8 in the direction of the arrow E, and rewinds only the empty reel 6 at this predetermined position. has been done.

Specifically, a gear 33 is fixed to the contact ring 32, and a shaft 34
The corresponding contact ring 3 is attached to the tip of the swinging arm 35 that can swing freely around the axis of the
2 is pivoted.

36 is a drive source such as an electric motor, the shaft 34 is directly or indirectly interlocked and connected to the drive source 36, a gear 37 is fixed to the shaft 34, and the gear 37 and the gear 33 are always in mesh with each other. The power of the drive source 36 is transmitted through the gear 37 and the gear 3.
3. It is sequentially transmitted to the contact wheel 32.

Note that the gears 37 and 33 represent an example of a transmission mechanism for transmitting the rotation of the drive source to the contact wheel 32, and a belt, chain, or the like may also be used.

Reference numeral 38 denotes a rotary solenoid, and when its shaft 39 swings in the directions of arrows G and H in response to a signal from the sensing device 23, etc., a link mechanism 40 causes the swinging arm 35 to move along the shaft 3.
The abutment wheel 32 swings around four rotations to abut the drive roller 8 as shown in FIG. 3, or to be separated from the drive roller 8 as shown in FIG.

This rewinding drive device 31 is attached to the main body 2 at a position above the gate part 19 and protrudes into the inner space of the pedestal 4, and the pedestal 4 is intermittently rotated one pitch at a time to sequentially move to a predetermined rewinding position. The contact wheel 32 is configured to come into contact with the drive roller 8 of the reel 6 being sent, and further transmit the power of the drive source 36 to the drive roller 8 and the reel 6.

In this manner, one drive device 31 drives and rewinds as many as 20 to 40 holding devices 11.

As shown in FIG. 5, the outer peripheral surface 41 of the drive roller 8 is formed of an elastically deformable member such as rubber or plastic.
The outer circumferential surface 41, the contact ring 32, and the outer circumferential portion 7.7 reliably abut without slipping, thereby transmitting rotational torque.

moreover. This drive roller 8 has a large diameter at the center in the axial direction, and gradually becomes smaller in diameter as it approaches both end surfaces 42.42. The outer peripheral parts 7, 7 are pressed, respectively,
It is possible to automatically correct the reel 6 from falling or swinging, and to hold the reel 6 in the normal position.
If the roller 8 is pressed against the central large diameter portion, the roller 8 will be easily deformed elastically, and the rotational torque will be transmitted more reliably.

As detailed above, the present invention is structured so that the number of rewind drive devices 31 is minimal, the structure can be significantly simplified compared to conventional projectors, the entire projector can be made more compact, and the failure rate is significantly reduced. did.

In particular, it can be said that it is most suitable for a projector for a television camera, which must be equipped with a large number of supply reels 6.

Also, one of the plurality of rollers holding the supply reel 6
Since the reel is used for both support and rewinding drive, there is no need for a separate drive wheel, each reel holding device is made more compact, and the size of the entire frame is also made more compact.

Furthermore, since the contact wheel 32 rotationally drives the reel 6 via the drive roller 8, even if the contact wheel 32 suddenly contacts the drive roller 8 with sufficient force, the impact is not transmitted to the reel 6, so that the reel 6 can be rotated quietly, smoothly, and quickly. You can rewind reel 6.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall plan view, Fig. 2 is a front view thereof, Figs. 3 and 4 are enlarged front views of main parts partially shown in section, FIG. 5 is a developed sectional view, and FIG. 6 is the same sectional view showing other parts. 4... Frame, 6... Supply reel, 7.
...Outer peripheral portion, 8...Drive roller, 9...
... Reverse roller, 11 ... Holding device, 31
... Rewinding drive device, 32 ... Contact wheel, 41 ... Outer peripheral surface, 42 ... End surface.

Claims (1)

[Scope of utility model registration request] A large number of supply reels 6 are arranged close to each other in parallel along the outer peripheral edge of the pedestal 4 which is approximately circular in plan view.
Further, the mount 4 is mounted on the projector body 2 so as to be able to rotate intermittently one pitch at a time around the vertical axis 3, and one roller 8 near the back of the mount 4 supports the reel 6 and supports the reel 6. The outer peripheral portions 7, 7 of the reel 6 are also used as rewinding drives.
Furthermore, the rewind drive device 31 consisting of a drive source 36, a swing arm 35, a contact shaft 32, and a transmission mechanism is provided as a single unit, and the drive device 31 is connected to the upper end of the projector main body 2. A large number of the supply reels 6 are installed in a protruding manner and protruded from below into the interior of the pedestal 4.
. . , pull out the film 5 from the one that is located above the gate section 19, and then pull out the film 5 from the gate section 1 of the projector body
9, the film 5 is projected by the projection lens 20, and the film 5 is wound by the lower take-up reel 18, and a sensing device 23 for sensing when the film 5 has finished being projected is taken up from the supply reel 6. A solenoid 38 is disposed at an appropriate position during the feeding of the film 5 to the reel 18 and is actuated by a signal from the sensing device 23, and the solenoid 38 and the swinging arm 35 are connected to each other by a link mechanism. 40, and the drive roller 8 and the contact shaft 32 are separated from each other during projection, and when the projection is finished, the contact wheel 32 contacts the drive roller 8 and the drive roller 8 and the reel 6 are connected. A projector characterized in that it is rotatably driven in a rewinding direction and configured such that a single rewinding drive device 31 can sequentially rewind one of a plurality of reels 6 one by one.