CN2340038Y

CN2340038Y - Moving-sense-effect instrument of electric roll-type projector

Info

Publication number: CN2340038Y
Application number: CN 97209993
Authority: CN
Inventors: 顾彦; 王冬梅
Original assignee: Northeast Normal University
Current assignee: Northeast Normal University
Priority date: 1997-02-21
Filing date: 1997-02-21
Publication date: 1999-09-22
Anticipated expiration: 2007-02-21

Abstract

The utility model belongs to a teaching appliance, which is mainly composed of a grating film tape 9, a slow-advancing winding drum 7, a quick-retreating winding drum 23, quick-retreating torsional springs 19 and 21, a slide slot crank 10, a push rod poking pin 14, a unidirectional cam 18, a motor crank 12, a slow-rotating motor 13, an active piece 3, a tabletting frame 4, etc. Through the method that pieces are rolled, the continuouse automatic shift that the grating film tape 9 advances slowly and retreats quickly; by the method that the periphery of the tabletting frame 4 presses the active piece 3, the joint sealing of the grating film tape 9 and the active piece 3. The utility model, which has the advantages of compact structure, reliable performance, easy fabrication, convenient use and utilization of a plurality of teaching active pieces, can make projection patterns of a common projector automatically and persistently generate Moire fringe active effect. The utility model is suitable for universities, middle schools, primary schools and other educational departments.

Description

Electric reel formula projector Moving visual presentation appliance for education

The utility model belongs to teaching instrument and equipment.

At present, existing dynamoelectric projection device Moving visual presentation appliance for education is used the Moire fringe principle, adopts dull and stereotyped frame that the to-and-fro movement that the linve fringe lenticular lenses is done slow forward fast backward automatically is installed, make the dynamic transparency of striped of teaching pattern content produce the Moire fringe that moves variation, can produce dynamic effect constantly substantially.The more electronic propelling than in the past, manually retracted Moving visual presentation appliance for education, improve to some extent, but also have following defective: 1, its dull and stereotyped frame seesaw all stretch out outside the apparatus subject very long, meet extraneous obstacle (projector pole for example slightly, teacher's hand or arm, other teaching aid etc.) will stop motion, instrument is broken down.If dull and stereotyped frame is closed, make body long again, inconvenience is laid on the projector table top.2, friction advances its dull and stereotyped frame by friction pulley, and normal pressure is too small, and then friction pulley can not promote flat board and frame shift moving the friction thrust deficiency of dull and stereotyped frame; Normal pressure is excessive, has also increased the friction force between dull and stereotyped frame and guide rail simultaneously, makes the dull and stereotyped frame can not be along the guide rail slippage, and the normal pressure size is difficult to regulate suitably, often breaks down.3, its dull and stereotyped frame by slow-motion to the transformation of rewind down be by the motor pinch roller with motion traveller and frame on the static traveller fixed contact slip (cam mechanism that is equivalent to be out of shape), lift friction pulley (together with motor), allow spring retract fast that dull and stereotyped frame realizes; That steps back soon delays into once more, wait for that two travellers disengage, and could realize after friction pulley is fallen.Because motor rotates very slowly (1 rev/min), just make friction pulley lift extremely difficult adjusting of length of time; Static traveller is high slightly, and little by little then friction pulley lifts overlong time, and after dull and stereotyped frame retreated to initial point, friction pulley still end fell, and dull and stereotyped frame can not delay into immediately, and the instrument dynamic effect interrupts the long period; Static traveller is low slightly little by little, then friction pulley time of lifting too short, friction pulley falls too early, dull and stereotyped frame retreats to midway and is just promoted to delay into by friction pulley again, reaches home in advance and stops, and makes the instrument dynamic effect interrupt the longer time.Advance again and again accumulation to get up in advance, even dull and stereotyped frame is seldom had delay into leeway, instrument can't be worked.Both made adjusting for the moment suitable, owing to transportation, remove and vibration cause such as move, changed the relevant gap of some parts slightly, for example the string of motor shaft is moving, the distortion of motor frame plate, the string of frame plate strand key is moving or the like, all is equivalent to change the relative height of static traveller, thereby have a relapse the fault of living again.In a word, there are many like this failure factors in the instruments used for education as a kind of class demonstration is used, and performance is extremely unstable, extremely unreliable, and not only factory is difficult to produce in batches, more makes common teachers be difficult to adjusting and grasp.At any time the fault of Fa Shenging all directly influences the class demonstration teaching efficiency, even influences order in education.4, in addition, above-mentioned dynamoelectric projection device Moving visual presentation appliance for education, for making moving grating and the clear measure of taking simultaneously of static dynamic transparency picture, do not reach it and give the purpose of phase: after it has cancelled the frame of dynamic transparency, only clamp transparency one end with clamping plate, expecting that all the other positions are open and flat seamlessly connects airtight with it on moving grating.In fact, clamp an end,, be located at again on the flat grating, in closing on a segment distance of clamping plate, have very big gap inevitably because clamping plate itself have certain thickness with clamping plate; Because it only clamps transparency one end, appoint all the other big portions of transparency to take from by state, the angle, corner, limit of transparency even the random warpage of large tracts of land picture (particularly after projector intense light irradiation heat) form excessive gap at random as a result, have exactly deviated from its original expectation.

The purpose of this utility model is: at the problems referred to above, provide a kind of compactness rational in infrastructure, control gear is accurate, and is easy to manufacture, debugging is simple, and is easy to use, stable and reliable for performance, non-fault, the projection dynamic effect is good, practical electric reel formula projector Moving visual presentation appliance for education.

This instrument has been abandoned the dull and stereotyped frame of aforementioned grating, adopts two reel scrolling raster films of advance and retreat to take to reciprocating cutter, makes the apparatus structure compactness, complete machine sealing, the undirected outer moving component that stretches; This instrument has been abandoned fricting transmissioning mode, and adopt motor directly to stir reel and rotate by drive pin, thereby reliable transmission; This instrument has been abandoned the numerous control gear of aforementioned defect, promotes push rod with folk prescription to the cam that relatively moves, and drives the finger slippage, controls the clutch of motor and reel transmission, thereby realizes the conversion of non-fault, nothing reciprocal rotation intermittently; This instrument has been abandoned aforementioned single-ended clamping plate film clamping machine, and employing compressing tablet frame compresses transparency all around and really realizes comprehensively connecting airtight of transparency and moving grating.

The utility model compactness rational in infrastructure, stable and reliable for performance, easy to manufacture, easy and simple to handle, but the multiple Moire fringe teaching of adapted film makes common teaching projector produce vivid dynamic effect, is widely used in education departments such as large, medium and small and vocational education, preschool education.

Below the contrast accompanying drawing elaborates to the utility model.

Fig. 1 is a stereoscopic synoptic diagram of the present utility model.

Fig. 2 is the assembling synoptic diagram of instrument internal critical part.(be equivalent to Fig. 1 and remove drain pan 1, case 2, dynamic transparency 3, compressing tablet frame 4, and the vertical view of supporting spring frame 29 etc.)

Fig. 3 is the schematic perspective view of motor crank 12.

Fig. 4 is the schematic perspective view of push rod finger 14.

Fig. 5 is the local elevational schematic view of the A-A of Fig. 2.

Fig. 6 is the B-B diagrammatic cross-section of Fig. 2.

Fig. 7 is the A-A partial cutaway schematic of Fig. 1.(removing supporting spring frame 29)

Fig. 8 is the B-B partial cutaway schematic of Fig. 1.

Be labeled as among each figure:

Drain pan 1, case 2, dynamic sheet 3, compressing tablet frame 4 delays into spool shaft 5, damping torsionspring 6, delay into reel 7, the sliding roller 8 in a left side, raster film band 9, chute crank 10, the push rod compression spring 11 that resets, motor crank 12, slow-speed motor 13, push rod finger 14, cam spacer pin 15, camshaft 16, the cam torsionspring 17 that resets, unidirectional cam 18, speed is moved back dextrorotation torsionspring 19, right sliding roller 20, and speed is moved back left-handed torsionspring 21, speed is moved back spool shaft 22, fast debatching tube 23, the drive pin position 24 of motor crank 12, the finger position 25 of push rod finger 14, the most advanced and sophisticated position 26 of push rod finger 14, soft elasto-plasticity paw 27, compressing tablet frame axle 28, supporting spring frame 29.

See Fig. 2, delay into reel 7, chute crank 10, be fixedly connected with delaying into spool shaft 5. Speed debatching tube 23, Being fixedly connected on speed moves back on the spool shaft 22. Motor crank 12 is fixedly connected on the output shaft of slow-speed motor 13.

See Fig. 2 and Fig. 6, the two ends of raster film band 9 are cemented in respectively delays on reel 7 and fast debatching tube 23, Roll tightly in the other direction, and be stretched on left sliding roller 8 and the right sliding roller 20. Turn to counterclockwise when delaying into reel 7 is driven When moving (being for Fig. 6 clockwise, counterclockwise, lower same), scrolling raster film band 9 makes it two The slow shift-in left of flat segments on the

sliding roller

8,20, and damping torsionspring 6 is loosened gradually; Drag simultaneously speed Debatching tube 23 is also done and is rotated counterclockwise, and discharges raster film band 9, and makes fast back twist turn to spring 19,21 gradually More roll tightly. When delaying when breaking away from into the driving of reel 7 and slow-speed motor 13, fast back twist is just turned to spring 19,21 Drive fast debatching tube 23 with its elastic restoring force square and clockwise rotate rapidly, and scrolling raster film band 9, make Its flat segments on two

sliding rollers

8,20 are return to the right fast, and dragging simultaneously to delay also to do clockwise into reel 7 turns to Moving, discharge the raster film band 9 that it is rolled. Damping torsionspring 6 rises and to increase gradually in moving back the sheet process Damping action keeps raster film band 9 to be in all the time tensioning state, and the vibration when stopping of reducing to reverse. The peak torque that design makes damping torsionspring 6 is turned to spring 19,21 minimum total torque much smaller than fast back twist, Thereby be unlikely to hinder retaining sheet action. When two

reels

7,23 turn over nearly 360 ° clockwise fast, delay into Reel 7 is again driven, begins the action in next cycle.

Like this, both realized the action of raster film band 9 slow forward fast backwards, made again the apparatus structure compactness, occupied The space is little, is convenient to be closed in the casing, (only stay logical light window, as shown in Figure 1) unlikely because of overhanging movable part Part touches extraneous obstacle and machine halt trouble takes place.

See Fig. 5 and Fig. 2. When slow-speed motor 13 drive motor cranks 12 rotate counterclockwise, on the motor crank 12 Drive pin 24 is stirred the finger 25 on the push rod finger 14, thereby when drive chute crank 10 goes to such as Fig. 5 position, One-way cam 18 can not be clockwise rotated by the restriction of cam spacer pin 15. Push rod finger 14 is namely by unidirectional protruding The oblique arc cam surface of wheel 18 pushes slippage left gradually. When push rod finger 14 moves to left to its finger 25 and motor song When the drive pin 24 of handle 12 staggers, chute crank 10 just rapidly by fast back twist turn to spring 19,21 elasticity is recovered Moment goes back to nearly 360 ° clockwise. Around here, the push rod finger 14 in chute crank 10 chutes is multiple by push rod Position Compress Spring 11 is to being extrapolated to original position. Until the finger of push rod finger 14 25 touch again the drive pin 24 of motor crank 12, and heavy driven doing counterclockwise slowly rotated at once, just begins The action of next cycle. Because one-way cam 18 can be done around camshaft 16 and rotate counterclockwise, so, might as well Hinder the tip 26 of push rod finger 14 to be done and clockwise rotate, when the tip 26 of push rod finger 14 is driven do slowly contrary When hour hands rotated, one-way cam 18 was subjected to the reset elastic restoring force square effect of torsionspring 17 of cam also to follow it After do and clockwise rotate, stop until being subjected to the restriction of cam spacer pin 15, it is more single to be ready to next cycle Direction plays the effect of the cam that relatively moves.

Like this, just realized the nothing mutual conversion intermittently of raster film band 9 slow forward fast backwards smoothly.And then, owing to can design the lift of the oblique arc cam surface of suitable unidirectional cam 18 easily, make it greater than the push rod finger 14 needed journeys (for example big 2mm) of moving back, just allow unidirectional cam 18 fully, push rod finger 14 and correlated parts have bigger manufacturing and alignment error, and both having made has a spot of distortion and wearing and tearing again, also do not hinder the mutual conversion of finishing slow forward fast backward in raster film band 9 smoothly, need not regulate fully, the fault that can not stop over yet.Because under this mechanism, a little of switching time in advance or postpone only changes the length of the raster film band 9 invalid parts that two

reels

7,23 have rolled slightly.

And, the fricting transmissioning mode of having forgone in the main transmittance process of driving force, therefore all faults of having avoided friction gearing to bring fully.

See Fig. 1, for realize really connecting airtight of dynamic sheet 3 and raster film band 9 comprehensively, this instrument adopts compressing tablet frame 4, from push down dynamic sheet 3 all around comprehensively.

See Fig. 7, allow the live part of dynamic sheet 3 drop in the long limit scope of compressing tablet frame 4 rectangular windows, under 4 liang of minor faces of compressing tablet frame soft elasto-plasticity paw 27 is housed, soft elasto-plasticity paw 27 is pressed on the low step of case 2 along last with two minor face edges of the dynamic sheet 3 of rectangle, in the compressing tablet process and to dynamic sheet 3, the component of stretching is arranged slightly, be beneficial to dynamic sheet and flatten.

See Fig. 8, on other direction, the live part of dynamic sheet 3 is dropped in the rectangular window minor face scope of compressing tablet frame 4, under the two long limits of compressing tablet frame 4 soft elasto-plasticity paw 27 is housed also, the edge, two long limits of dynamic sheet 3 is pressed on the supporting spring frame 29, the same component that dynamic sheet 3 is had slightly stretching in the compressing tablet process also is beneficial to the flattening of dynamic sheet 3.

Design makes the low step edge of case 2 and supporting spring frame 29 carry the surface of dynamic sheet 3 and be stretched in the two raster film bands of sliding on the

rollers

8,20 9 approaching contour, just realize comprehensively reliably connecting airtight of dynamic sheet 3 and raster film band 9, avoided dynamic sheet warpage to cause that image and grating fringe do not cover end simultaneously clearly.

Below in conjunction with description of drawings the utility model one specific embodiment: shown in Fig. 1～8: raster film band 9, long 860mm, wide 140mm prints the horizontal raster striped in the thick 0.1mm, middle segment length 480mm, and fringe density is 24 couples of line/cm.Dynamic sheet 3 long 235mm, wide 163mm, long between two parties 170mm prints moire fringe on the wide 130mm useful area.The long 170mm of compressing tablet frame 4 its logical light windows, wide 130mm makes with the engineering plastics injection moulding.Delay into reel 7 and the long 152mm of fast debatching tube 23 usefulness external diameter Φ 40mm, the engineering plastics garden tube of wall thickness 2mm and engineering plastics end be stifled to be inlayed and adding bonding and make.Delay into spool shaft 5 long 182mm, speed is moved back spool shaft 22, long 186mm, equal Φ 6mm, cold-drawn steel.Above-mentioned diaxon is bearing shell everywhere, brass system, long 4mm, internal diameter Φ 6mm, external diameter Φ 10mm.About two sliding roller cold-drawn steels, long 152mm (disregard end spool), Φ 6mm.Damping torsionspring 6, left-handed with the coiling of Φ 0.8mm carbon spring steel wires, number of active coils 9 circles, middle footpath 20mm.Spring 19,21 is changeed in the speed back twist, and is close around, number of active coils 7 circles with Φ 1mm carbon spring steel wires, middle footpath Φ 20mm, left-handed dextrorotation each one.Drain pan 1, case 2, chute crank 10, push rod finger 14, unidirectional cam 18, motor crank 12, supporting spring frame 29 is all made with the engineering plastics injection moulding.Soft elasto-plasticity paw 27 usefulness nonrigid plastic injection mouldings are made.The push rod compression spring 11 that resets, the cam torsionspring 17 that resets is manufactured with Φ 0.3mm carbon spring steel wires.Slow-speed motor 13 adopts the high moment of torsion synchronous motor of the single rotation direction of alternating current 220V miniature (3W) slow-speed (1 rev/min).With two winding

drum axle

5,22 and 13 fixedly connected parts of slow-speed motor, all employing garden awl steel pin nail connects and adds cementation.Camshaft 16, cam spacer pin 15, compressing tablet frame axle 28 is all made of Φ 2mm spoke steel, and blanching plastic packaging in back is installed.Parts shown in Figure 2 and power switch, pilot lamp etc. are installed on the drain pan 1, and top is whole to be closed in the casing with case 2.The machine shape size is about long 300mm, wide 250mm, high 65mm, the high about 54mm of chassis body.

This Moving visual presentation appliance for education is placed on the projector table top, energized, turn on the power switch, raise compressing tablet frame 4, put into the dynamic sheet 3 of teaching graphic pattern projection, the compressing tablet frame 4 that closes again regulates projection orientation and focal length, can demonstrate out the dynamic effect of Moire fringe sheet automatically, on projection screen, observe the lively situation that the broad sense fluid flows slowly in the pattern.

Claims

1, a kind of electric reel formula projector Moving visual presentation appliance for education with mobile grating is characterized in that delaying into reel 7 scrolling raster film bands 9 slow shift-ins by 13 drivings of slow-speed motor; Thereby return rapidly by the recovery of elasticity moment scrolling speed debatching tube 23 scrolling raster film bands 9 of fast back twist commentaries on classics spring 19,21 again; Control slow-speed motors 13 and delay the into clutch of reel 7 by push rod finger 14 and unidirectional cam 18, control raster film band 9 slow forward fast backwards and do not have mutual conversion intermittently, make dynamic sheet 3 automatic continuous formation Moire fringes move the dynamic effect of variation.By drain pan 1, case 2, dynamic sheet 3, compressing tablet frame 4, delay into spool shaft 5, damping torsionspring 6, delay into reel 7, the sliding roller 8 in a left side, raster film band 9, chute crank 10, the push rod compression spring 11 that resets, motor crank 12, slow-speed motor 13, push rod finger 14, cam spacer pin 15, camshaft 16, the cam torsionspring 17 that resets, unidirectional cam 18, speed is moved back dextrorotation torsionspring 19, right sliding roller 20, speed is moved back left-handed torsionspring 21, speed is moved back spool shaft 22, speed debatching tube 23, soft elasto-plasticity paw 27, compressing tablet frame axle 28, supporting spring frame 29 is formed.(24 is that the drive pin position, 25 of motor crank 12 is the most advanced and sophisticated position of push rod finger 14 for the finger position of push rod finger 14,26)

2, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: delay into that reel 7 and fast debatching tube 23 external diameters are 30mm-50mm, length is 140mm-180mm, and the linear velocity at reel edge was 90mm/ branch-150mm/ branch when slow-speed was moving.

3, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: the raster film band 9 long 400mm-1000mm of being, wide 130mm-210mm, thick 0.05mm-0.15mm, make with transparent projection film band, print the horizontal raster striped in total length or its stage casing 300mm-500mm, fringe density is that 6-40 is to line/cm.

4, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: raster film band 9 two ends are cemented in delays on the reel 7 and fast debatching tube 23, rolling-in in the other direction, and be stretched on sliding roller 8 in a left side and the right sliding roller 20.

5, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: delay the driving that the into slow rotation of reel 7 and fast debatching tube 23 relies on slow-speed motor 13, counter-rotating relies on speed to move back dextrorotation torsionspring 19 and speed to move back the recovery of elasticity moment of left-handed torsionspring 21 and drive fast.

6, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: damping torsionspring 6 plays tensioning grating fringe band 9 when moving back sheet.

7,, it is characterized in that by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education: delay drive pin 24 that the into conversion of reel 7 and fast debatching tube 23 forward and backwards relies on motor crank 12 and push rod finger 14 finger 25 from, incompatible finishing.

8, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: the drive pin 24 of motor crank 12 relies on the advance and retreat of push rod finger 14 to realize with the clutch of the finger 25 of push rod finger 14: push rod finger 14 retreats, its finger 25 staggers with the drive pin 24 of motor crank 12, and they are separated; Advancing in the anti-process that circles of push rod finger resets, make again their the contact and engage.

9, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: finish at the tip 26 that the backward movement of push rod finger 14 relies on the oblique cambered surface of unidirectional cam 18 to promote push rod finger 14; The advancing of push rod finger 14 resets and finishes by the reset elastic restoring force of compression spring 11 of push rod.

10, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: unidirectional cam 18 is subjected to the restriction of cam spacer pin 15, and folk prescription is to playing the action of cam that relatively moves; Can rotate enough angles around camshaft 16 in the time of in the other direction, tip 26 counter-rotatings of not overslaugh push rod finger 14.Unidirectional cam 18 be subjected to cam reset torsionspring 17 the multiple extensive moment of elasticity effect and reset.

11, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: the lift ratio push rod finger 14 of the oblique cambered surface of unidirectional cam 18 is for making drive pin 24 and the finger 25 needed big 0.5mm-3mm of journey that moves back that staggers.

12, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: effective pattern dimension of dynamic sheet 3 is long 150mm-180mm, wide 120mm-140mm occupies dynamic sheet 3 middle parts, and the size of dynamic sheet 3 is greater than effective pattern corresponding size 10mm-100mm.

13, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that: soft elasto-plasticity paw 27 is installed, 4-20 below the compressing tablet frame 4.

14, by the said electric reel formula of claim 1 projector Moving visual presentation appliance for education, it is characterized in that; The effective pattern part and the gap between the raster film band 9 of dynamic sheet 3 are 0-0.5mm.