JP3070164B2 - Projection screen equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a video projector,
The present invention relates to a screen device in a projection system such as a projector and a phantom lamp.

More specifically, when not in use, the screen is compactly wrapped in the storage section on the floor side to keep the storage state, and when in use, the storage screen of this storage section is rewound from the bottom while being rewound. The present invention relates to a liftable movable projection screen device that can be lifted and kept in an extended state.

[0003]

2. Description of the Related Art A projection screen device of the above-mentioned lifting type is already known. 4 and 5 show an example thereof. FIG. 4 and FIG. 5 are rear views of the device in a partially expanded longitudinally cutaway state and in a screen retracted state, respectively.

[0004] Reference numeral 50 denotes a horizontally long screen storage box, which is installed on the floor of a projection room or stage. Reference numeral 52 denotes a screen winding / rewinding shaft which is rotatably supported with both ends rotatably supported in the storage box 50, 53 denotes a shaft drive motor for driving the shaft forward / reverse, and 54 denotes a shaft drive motor. A windable flexible screen,
The lower side is locked to a shaft 52, and the shaft 52 is wound around the shaft by being reversed by a motor 53. Conversely, when the shaft 52 is rotated forward by the motor 53, the shaft 52 is rewound from the shaft and fed out. Reference numeral 55 denotes a cross bar attached to the upper side of the screen 54.

[0005] Reference numerals 56L and 56R denote stationary shafts provided on the left and right sides in the storage box 50, and 57L and 57R denote respective stationary shafts 56L and 57L.
A pair of left and right first links 58L and 58R are provided so as to be capable of turning up and down around 56R.
L / 57R pivotally attached to each end of 59L / 5
This is a pair of left and right second links 9R. The distal ends of the pair of left and right second links 58L and 58R are pivotally attached to the left and right portions of the crosspiece 55 at the upper side of the screen.
・ 60R.

[0006] 61L and 61R are spring hanging shafts 62L and 61L provided on the rear end side of a pair of left and right second links 58L and 58R, respectively.
62R and stationary shafts 56L / 5 on the left and right sides in the storage box 50
6R is a pair of left and right tension coil springs stretched between the coil springs.

[0007] The first and second links 57L on the left side
58L, and first and second links 57R / 5 on the right side
Reference numeral 8L is always raised around the shafts 56L, 59L, 56R, 59R by the tensile force of the tensile coil springs 61L, 61R, and receives a rotational biasing force. Accordingly, the first and second links 57L and 58
The screen 54 is constantly lifted and urged by the above-described rising rotation urging force of L, 57R and 58R, and the screen 54 is constantly subjected to a rising force.

[0008] First and second left and right links 57L
58L, 57R and 58R are tension coil springs 61 respectively
When receiving the turning force against the pulling force of the L · 61R, it collapses into the storage box 50 and turns, and finally, as shown in FIG.
Is completely folded and stored in the storage box 50 as shown in FIG.

When the screen is lifted up and extended as shown in FIG.
Link 57L / 58L, 57R / 58R and spring 61L
When the screen 54 is wound around the shaft 52 against the screen lifting force by the 61R, the screen winding force causes the first and second links 57L and 58 on the left and right sides.
L, 57R and 58R are tension coil springs 61L and 6 respectively.
Receiving the tilting force against the pulling force of 1R, the screen is folded into the storage box 50 as the screen is wound, and finally the lean 54 is sufficiently wound on the shaft 52 as shown in FIG. As a result, the cross bar 55 on the upper side of the screen is cut down into the storage box 50, and thus the first and second links 57L and 58L and 57R and 58R on the left and right sides are completely folded into the storage box 50. become.

In FIG. 5, reference numeral 51 denotes a cover plate for the upper opening of the storage box 50, which is hingedly connected to the storage box and can be freely opened and closed. When the screen 54 is stored in the storage box 50 when not in use, the cover plate is closed to prevent dust and dirt from entering the storage box.

When the screen is used, the cover plate 51 of the storage box 50 is opened, and the motor 53 is driven to rotate forward. As a result, the screen 54 wound around the shaft 52 is unwound and fed out, so that the screen 54 is folded into the storage box 50 against the tensile force of the tension coil springs 61L and 61R by the winding force of the screen 54. Left and right first and second links 57L / 58L, 57R / 5 held on the left and right sides
8R rises and turns, and as the screen 54 is rewound, the crosspiece 55 on the upper side of the screen is lifted, and the payout screen 54 rises upward from the inside of the storage box 50, and finally the screen shown in FIG. It rises and is in an extended state.

Reference numerals 63L and 63R denote safety belt wrapping devices provided on the left and right sides of the storage box 50, which are the same as safety belt wrapping devices for automobiles. 64L
Reference numerals 64R denote left and right safety belts which are wound around the winding devices, and the leading ends of the belts are respectively engaged with the left and right ends of the crosspiece 55 on the upper side of the screen.

Safety belt winding device 63L / 63
R constantly entrains and urges the belts 64L and 64R, respectively, and these belts engage the devices 63L and 63R during the screen climbing process in which the screen 54 moves from the retracted state of FIG. 5 to the extended state of FIG. The screen 54 is pulled out smoothly as the screen rises against the urging force. Conversely, in the screen lowering process in which the screen 54 moves from the rising state of FIG. 4 to the retracted state of FIG. It is smoothly involved in the devices 63L and 63R.

This safety belt device 63L / 63R
When a rapid tensile force acts on the belts 64L and 64R, the belt 64L acts to prevent the belt from being pulled out.
Left and right first and second links 57L, 58L, 57L
The first and second links 57L, 58L, 57 when the screen 54 to which the lifting force is constantly applied by the 58R and the tension coil springs 61L, 61R are torn.
It functions to prevent the abrupt upward movement of the R.58R and the screen crosspiece 55.

[0015]

The following problems can be cited as problems of such a projection screen device of the raising and extending type.

(1) In order to balance the left and right sides of the screen 54 so that the screen 54 can be lifted and extended, and to be lowered, the first and second links 57L and 57L on the left and right sides can be used.
It is necessary to evenly balance the tensile forces of the left and right tension coil springs 61L and 61R for raising and rotating the 58L, 57R and 58R, respectively.

(2) Left and right extension coil springs 61L and 6L
In 1R, the pulling force is always applied in the screen raised state and the retracted state, and especially in the retracted state, the links 57L / 58L, 57R / 58R are folded more than the screen raised / expanded state by folding the links 57L / 58L, 57R / 58R. The spring 61L
Settling is likely to occur in 61R, and a screen lifting operation failure due to settling of springs 61L and 61R is likely to occur.

(3) As described above, when the screen is stored, the tension coil springs 61L and 61R are stretched by the folding of the links 57L and 58L and 57R and 58R as compared with the case where the screen is lifted and expanded, and a strong tensile force is generated. When it is in the acted state, the screen tension portion 54A between the crosspiece 55 on the upper side of the screen and the screen portion wound around the shaft 52 due to the strong tensile force (FIG. 5).
Elongation tends to occur, and such elongation lowers the tensile strength of the screen, leading to the occurrence of tearing of the screen.

(4) First and second links 57L, 58L, 57R, 58 when the screen tears.
R and the safety belt devices 63L and 6L as described above in order to prevent a sudden upward movement of the screen crosspiece 55.
3R arrangement is required.

Another object of the present invention is to provide a movable projection screen device which can be moved upward by a screen, but which does not have the above-mentioned problems.

[0021]

SUMMARY OF THE INVENTION The present invention provides a flexible projection screen which can be wound around a shaft, and a screen which is disposed in a screen storage portion and which always engages the screen by locking the lower side of the screen. A biased screen winding shaft, a parallelogram link mechanism that operates to fall into the screen storage unit in conjunction with the reverse movement of the drive device and rises from the screen storage unit in conjunction with the forward movement of the drive device,
It is provided on the tip side of the parallelogram link mechanism, and falls and rises in conjunction with the falling and rising motion of the parallelogram link mechanism. A screen crossbar support arm pivotally attached to the screen crossbar support arm, wherein the screen crossbar support arm meshes with a gear provided concentrically at the center of the arm's falling and standing and a gear provided on the parallelogram link mechanism side to form a parallelogram link mechanism; The two gears are provided with at least one of them freely rotatable about its central support shaft, and the two gears are arranged in parallel with or parallel to the screen rung support arm on the gear side. Angle adjustment on the side of the quadrilateral link mechanism
Projection screen apparatus characterized by having a freely adjustable locking means for rotation stopper by settling. A flexible projection screen that can be wound around the shaft; a screen winding shaft that is disposed in the screen storage portion and locks the lower side of the screen to constantly wind and bias the screen; A parallelogram link mechanism that falls down into the screen storage unit in conjunction with the reverse movement of the screen storage unit, and rises from the screen storage unit in conjunction with the forward movement of the drive device, and is provided at the tip side of the parallelogram link mechanism, and collapsing-standing operation in conjunction with collapsing-standing operation of the parallelogram linkage mechanism, slidable adjustment to Oite crosspiece longitudinally substantially middle point of the crossbar having a distal end portion to the upper portion of the screen
A screen crossbar support arm pivotally attached to the adjusting mechanism, and the screen crossbar support arm engages with a gear provided concentrically at the center of the arm falling and standing and a parallelogram engaging with a gear provided on the parallelogram link mechanism side. The link mechanism is tilted and erected in conjunction with the tilting and erection operation of the link mechanism, and at least one of the two gears is rotatably provided about a central support shaft thereof, and the gear is provided on a screen crosspiece support arm on the gear side. A projection screen device comprising a gear locking means for stopping rotation on a side or a parallelogram link mechanism side.

[0022]

(A) In the screen storage state, the parallelogram link mechanism and the screen crossbar support arm are both sufficiently folded down into the screen storage unit and folded and the screen crossbar is lowered to the screen storage unit. ,
Therefore, the screen is wound around the shaft by the screen winding action of the winding shaft.

(B) When the driving device is moved forward from this state, the parallelogram link mechanism and the screen crossbar supporting arm interlocking with the parallelogram link mechanism are erected from the screen storage section, and the screen crosspiece is moved upward from the screen storage section. As a result, the screen wound on the shaft is rewound against the screen winding force of the shaft, and is lifted upward and expanded. Then, when the parallelogram link mechanism and the screen crosspiece support arm are turned upright at a predetermined angle, the screen is properly lifted from the storage unit to be in the extended state.

(C) When the driving device is reversely moved in the screen raising and expanding state, the parallelogram link mechanism and the screen crossbar support arm fall down, and the screen crossbar descends. The screen is wound around the shaft by the screen winding force of the shaft. When the parallelogram link mechanism and the screen crosspiece support arm fall down at a predetermined angle, the screen is sufficiently wound on the shaft and is properly stored in the storage section.

In the above projection screen apparatus of the present invention, the screen is lifted by a parallelogram link mechanism which is raised by a driving device and a screen crossbar support arm which is raised in conjunction with the parallelogram link mechanism. Since the mechanism is often used and does not have a tension coil spring as in the device of the above-mentioned known example, the above-mentioned problem caused by having such a spring does not occur. There is no need to provide a safety belt device.

(D) The screen crossbar support arm engages with a gear provided concentrically at the center of the arm's falling and standing and a gear provided on the side of the parallelogram link mechanism to allow the parallelogram link mechanism to fall and stand. Fall in conjunction with
The interlocking mechanism can be easily configured by performing the standing operation.

(E) In this case, at least one of the two gears is rotatably provided about a central support shaft, and the gears are provided on the screen side of the screen rung support arm or on the side of the parallelogram link mechanism on the gear side. When assembling the device with a gear locking means for stopping rotation and assembling the parallelogram link mechanism side and the screen crossbar support arm with the gears on each side, the gears are not stopped and the rotation is free. The gears are engaged with each other, and after the engagement, the gears are stopped by the locking means.

Thus, it is unlikely that both gears will be fixed to the parallelogram link mechanism and the screen crossbar support arm on the respective sides in advance, and the gears will be engaged with each other to assemble the device. Due to the inability to adjust the subtle gear fixing angle deviation within one tooth between the gears, the gears cannot mesh with each other, cannot be assembled for that purpose, the position of the tip of the screen crossbar support arm with respect to the screen crossbar middle point, etc. Can be prevented, and the assemblability of the device can be improved.

[0029]

1, 2 and 3 show an embodiment of a projection screen device according to the present invention. FIGS. 1 and 2 show one embodiment of the device in a screen extended state and a screen stored state, respectively. It is a partial cutaway longitudinal rear view. FIG. 3 is an enlarged view of an interlocking gear portion between the parallelogram link mechanism and the screen crossbar support arm.

Reference numerals 1 and 2 denote a screen storage box and its cover plate. Reference numeral 3 denotes a flexible projection screen which can be wound on a shaft. Reference numeral 4 denotes a screen winding shaft which is provided horizontally with bearings 5.5 at both ends in the storage box 1. Is locked. The shaft is constantly biased in the screen winding direction by biasing means (not shown) built in the shaft.

Reference numeral 6 denotes a chassis fixedly provided at a substantially central portion in the storage box 1, and reference numeral 7 denotes a bearing 8 at both ends thereof at the central portion of the chassis.
8 is a worm provided so as to be freely rotatably supported by a bearing, and the worm is driven by a forward / reverse rotation motor 9 to rotate forward and backward. 10 is the final shaft of the motor 9 and the worm 7
2 shows a joint that connects

Reference numeral 11 denotes a worm gear that is supported by the chassis on the bearing and meshes with the worm 7. Reference numeral 12 denotes a rotation center axis of the worm gear 11.

A first sub-plate 13 rotates integrally with the worm gear 11, a first link 14 has a lower end integrally fixed to the sub-plate, and 15 has a lower end freely rotatable with respect to the chassis 6. The second link 17 pivotally connected to the first link 17
And the distal end of the second link 15 are pivotably connected to each other 18.
19 is a connecting plate connected. The distal end of the first link 14 is a second sub-plate 2 that is rotatably provided about a pivot 18.
0 and integrally connected to the connecting plate 17.

The first link 14 and the pivots 18 and 19 of the connecting plate 17, the second link 15 and the shaft 12
A parallelogram link mechanism is constituted between the 16 sections. The parallelogram link mechanism is configured such that the motor 9 is driven to rotate forward in a posture in which the parallelogram link mechanism is folded and folded in the storage box 1 in FIG. A clockwise rotation centering on the shaft 12 is transmitted to the first sub-plate 13 of the first link 14 via the worm 7 and the worm gear 11, and the first sub-plate 13 is driven to rotate to the upright posture of FIG.

Conversely, when the motor 9 is driven to rotate reversely in the upright posture shown in FIG. 1, a counterclockwise rotation about the shaft 12 is transmitted to the first sub-plate 13 of the first link 14. 2 is driven to rotate into the storage box.

Reference numeral 21 denotes a first spur gear provided concentrically with the pivot 18 on the connecting plate 17 side of the first link 14 and integrated with the second sub-plate 20. Reference numeral 22 denotes a third sub-plate which is rotatably and pivotally mounted on the connecting plate 17 in the vicinity of the first spur gear 21. Reference numeral 24 denotes a third sub-plate which is rotatably provided concentrically on the pivot 23. The third sub-plate 22 at 31 (FIG. 3)
Or, the second rotation stopped on the screen rung support arm 25
And is meshed with the first spur gear 21.

The screen crosspiece support arm 25 has a lower end integrally attached to the third sub-plate 22 and a leading end pivotally connected to a substantially middle point of a crosspiece 26 on the upper side of the screen.

When the parallelogram link mechanism is in the rotation angle position in which the parallelogram link mechanism is tilted into the storage box 1 as shown in FIG.
When the parallelogram link mechanism is turned upright by the forward rotation of the motor 9 in this state, the first and second flat links are interlocked therewith. The third sub-plate 22 is rotated counterclockwise about the pivot 23 by the engagement of the gears 21 and 24, so that the third sub-plate 22 is turned upright about the pivot 23.

When the parallelogram link mechanism is tilted down and rotated by the reverse rotation drive of the motor 9 from the standing state, the third sub-plate is engaged by the engagement of the first and second spur gears 21 and 24. The arm 25 receives clockwise rotation about the pivot 23 so that the arm 25 falls about the pivot 23 and rotates.

When the screen is retracted as shown in FIG. 2, the parallelogram link mechanisms 14, 15, 17 and the screen crossbar support arm 25 both fall down substantially horizontally due to the falling limit switch LSW provided in the storage box 1. Until pushed by the second link 15, it falls sufficiently into the storage box 1, is swung and folded, and the crosspiece 26 on the upper side of the screen is in the position lowered into the storage box 1.
Is held in a state of being wound around the shaft 4 by the winding force of the shaft.

In this state, when an operation switch (not shown) is turned on to raise the screen, the motor 9 is driven to rotate in the forward direction, whereby the parallelogram link mechanisms 14, 15, and 17 are rotated.
The screen crossbar support arm 25 is turned upright from the storage box 1 and the screen crossbar 26 is lifted upward from the storage box 1, and the screen 3 wrapped around the shaft 4 is wrapped around the shaft 4. It is rewound against the force and is lifted up and extended. When the upright limit switch (not shown) detects that the upright rotation angle of the parallelogram link mechanism has reached a predetermined angle, the forward rotation of the motor 9 is stopped, and the screen 3 is moved to the storage box 1.
1 is held in the state of FIG.

When the operation switch (not shown) is turned on to the screen storage side in the screen lifting and holding state shown in FIG. 1, the motor 9 is driven to rotate in the reverse direction, and the parallelogram link mechanism and the screen crosspiece support arm 25 fall down and rotate. As the screen crossbar 26 descends, the screen 3 is wound around the shaft 4 by the screen winding force of the shaft. When the parallelogram link mechanism and the arm 25 fall into the storage box 1 until the limit switch LSW is pressed by the second link 15, the motor 9 stops rotating in the reverse direction, and the reverse rotation of the motor 9 is stopped.
Is stored.

The lid plate 2 is hinged to the storage box 1 so as to be freely openable and closable similarly to the apparatus shown in FIG. 4, and is opened when the screen is used, and closed when the screen is stored and not used.

The forward drive command for raising the screen to the motor 9 and the reverse drive command for storing the screen can be of a wired or wireless remote control system.

In FIG. 1 and FIG. 2, reference numeral 28 denotes a guide rail made of a metal plate which also serves as a reinforcement for the cross bar attached to the cross bar 26 at the upper side of the screen. The slider plate 29 that can slide freely is fitted inside, and the distal end of the screen crosspiece support arm 25 is pivotally attached 27 to the slider plate 29, thereby absorbing dimensional errors and the like of each component. It is also effective to improve the assemblability by absorbing the dimensional errors and the like of the constituent members by making the size of the arms 25 telescopic so that the dimensions can be adjusted to some extent.

FIG. 3 is an enlarged view of an interlocking gear portion between the parallelogram link mechanism and the screen crossbar support arm. In the present embodiment, as described above, the first spur gear 21 on the side of the parallelogram link mechanism is concentric with the pivot 18 on the side of the connecting plate 17 of the first link 14 and integrated with the second sub-plate 20 in advance. Provided. Second spur gear 2 on screen rung support arm 25 side
Numeral 1 is provided on a pivot 23 of the third sub-plate 22 so as to be rotatable concentrically. Numeral 30 denotes a projecting piece provided integrally with the second spur gear 24, and numeral 31 denotes a screw rod screwed into the third sub-plate 22 and an arm 25 integrally attached thereto. 30a
Is a grip for operating the screw bar 31 by screwing.

The protruding piece 30 and the screw rod 31 are locking means for stopping the rotation of the second spur gear 24. When the screw rod 31 is turned in the screwing direction, the tip of the screw rod 31 contacts and interferes with the protruding piece 30 of the second spur gear 24, so that the second spur gear 24 is connected to the arm 25 and the third auxiliary The plate 22 is stopped from rotating. Conversely, when the screw rod 31 is turned in the loosening direction, the tip of the screw rod 31 separates from the protruding piece 30 of the second spur gear 24, and the detent state of the second spur gear 24 is released.

Thus, the parallelogram link mechanism side and the screen crossbar support arm 25 are connected to the first and second sides of the respective sides.
When assembling the apparatus by engaging the spur gears 21 and 24, the first and second spur gears 21 and 24 are engaged with each other in a freely rotating state without stopping the rotation of the second spur gear 24.
After the engagement, the second spur gear 24 is engaged with the locking means 30.
At 31 the rotation is stopped.

Thus, the two spur gears 21 and 24 are fixed to the parallelogram link mechanism and the screen crossbar support arm on the respective sides in advance and provided.
24 cannot be adjusted due to the inability to adjust the subtle gear fixing angle shift within one tooth of the gears, which is likely to occur when the device is assembled with the gears 24 engaged. It is possible to prevent the tip of the support arm from being displaced with respect to the intermediate point of the screen crosspiece, and to improve the assemblability of the apparatus.

The first gear 21 or the first and second gears 21 and 24 are provided so as to be freely rotatable about their central support shafts, and are provided with locking means for stopping the rotation of the gears. You can also.

The drive device for causing the parallelogram link mechanism to fall and stand up is not limited to the motor of the embodiment, but may be a hydraulic cylinder device such as hydraulic or pneumatic.

[0052]

As described above, the liftable movable projection screen device of the present invention does not have the above-mentioned problems in conventional devices of this kind, is durable, and has a simplified structure. It is also easy to assemble, and the intended purpose is well achieved.

[Brief description of the drawings]

FIG. 1 is a partially cut-away longitudinal rear view of an embodiment of a projection screen device according to the present invention when the screen is raised and extended.

FIG. 2 is the same drawing when the screen is stored.

FIG. 3 is an enlarged view of an interlocking gear portion of the parallelogram link mechanism and the screen crossbar support arm.

FIG. 4 is a partially cut-out longitudinal rear view of a conventional example device when the screen is lifted up and extended.

FIG. 5 is the same view when the screen is stored.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Screen storage box 3 Screen 4 Screen winding shaft 9 Forward / reverse rotation motor 14 ・ 15 ・ 17 Parallelogram link mechanism 21 ・ 24 Gears (first and second spur gears) 25 Screen crossbar support arm 26 Crossbar at upper side of screen 30 ・ 31 Protruding piece and screw rod as gear detent locking means

Claims (2)

(57) [Claims] 1. A flexible projection screen which can be wound around a shaft, and a screen winding shaft which is disposed in a screen storage portion and which is engaged with a lower side of the screen to constantly wind and bias the screen. The parallelogram link mechanism that falls into the screen storage unit in conjunction with the reverse movement of the drive unit and rises from the screen storage unit in conjunction with the forward movement of the drive unit, and the front end of the parallelogram link mechanism A screen crossbar support arm having a tip end portion pivotally connected to a substantially middle point of a crossbar provided on an upper side portion of the screen, the collapsible and erecting operation being performed in conjunction with the collapsing / standing operation of the parallelogram link mechanism. The screen rung support arm is a parallelogram formed by meshing with a gear provided concentrically with the arm at the center where the arm is inclined and standing and a gear provided on the side of the parallelogram link mechanism. The two gears are provided with at least one of them rotatably about a central support shaft, and the two gears are provided on the screen side bar supporting arm side of the gear side. Or adjust the angle to the parallelogram link mechanism side
Projection screen apparatus characterized by having a freely adjustable locking means for rotation stopper by settling. 2. A flexible projection screen which can be wound on a shaft, and a screen winding shaft which is disposed in a screen storage portion and which is engaged with a lower side of the screen to constantly wind and urge the screen. The parallelogram link mechanism that falls into the screen storage unit in conjunction with the reverse movement of the drive unit and rises from the screen storage unit in conjunction with the forward movement of the drive unit, and the front end of the parallelogram link mechanism provided, falling in conjunction with the collapsing-standing operation of the parallelogram linkage-standing work, slidable Oite crosspiece longitudinally substantially middle point of the crossbar having a distal end portion to the upper portion of the screen
A screen cross bar support arm pivotally attached to a simple adjustment mechanism , and the screen cross bar support arm is in parallel with a gear provided concentrically at the center of the arm falling down and standing up and a gear provided on the parallelogram link mechanism side. It falls and rises in conjunction with the fall and rise of the quadrilateral link mechanism,
At least one of the two gears is provided rotatably about its central support shaft, and has a gear locking means for stopping the rotation of the gear on the side of the screen rung support arm or on the side of the parallelogram link mechanism on the gear side. A projection screen device characterized by the above-mentioned.