CN2472973Y - Automatic erasing device for blackboard - Google Patents

Abstract

The utility model relates to a teaching aid, in particular to an improvement of the blackboard wiper. The utility model comprises a beam(5) with a gear rack(4) and a groove rack(3) which can moves to and fro on the beam(5) through a pulley device(12). The gear(2) which is positioned on the shaft of the main electric motor(1) moving along the movement of the groove rack is engaged with the gear rack(4). The utility model is also provided with a dust cover and a dust collector. The blackboard wiper which is positioned inside the dust cover is fixedly arranged on a slideable blackboard wiper frame(28). The blackboard wiper is driven by the frame(28) to do reciprocating motion in little distance and in horizontal direction through the cooperation of an accessory electric motor(21), a rolling wheel(23) and a sliding groove(19). The utility model has the advantages of high cleaning degree, easy writing, safe and dust proof.

Description

The automatic wiping arrangement of blackboard

The utility model relates to teaching aid, particularly to the automatic wiping arrangement of blackboard chalk mark.

Traditional piece shape is handed blackboard eraser, and, shortcomings such as speed slow, dust from flying big because of its labour intensity have been paid close attention to by everybody, and had many improvement projects openly to report.The disclosed technical scheme of Chinese patent 96203973 " Automatic eraser " comprises that body pillar, rail groove, bevel gear, gearbox, tooth bar reach and its meshed gears, and one is equipped with main shaft and the dust cover of wiping bar.Still there is following defective in this class improvement project:

1, owing to is the drum-type blackboard eraser; If blackboard has injustice slightly, then the person's handwriting of recess can't be wiped, and one stroke somewhere person's handwriting can only be subjected to a wiping, is difficult for cleaning.

2, teacher is if wish on the blackboard that certain row or certain row are kept, and all the other are cleaned, and then can't realize.

3, be used as power with rechargeable battery usually, the one, trouble, the 2nd, the cost height, if use alternating current, power line is longer, twines easily when dragging back and forth or the wearing and tearing electric wire; In case have a power failure then afunction.

The purpose of this utility model provides a kind of to blackboard person's handwriting degree of cleaning height, the dustproof automatic blackboard wiping device that automatic/hand is difunctional, can write down characters arbitrarily.

The utility model comprises a crossbeam that tooth bar is housed that is installed in the blackboard top, the truss that can on this crossbeam, back and forth move by pulley gear, main motor is housed on the truss, gear on it and the engagement of above-mentioned tooth bar, the truss below also is connected with a dust cover and interior blackboard eraser thereof, be connected to a dust arrester under the cover, it is characterized in that described blackboard eraser is fixed on the blackboard eraser framework that carriage is housed, make framework drive blackboard eraser small distance traverse motion.

Above-mentioned blackboard eraser can be wiped by the platelet of a plurality of vertical arrangements and form, spring is equipped with in every platelet rubdown portion, little cam respectively is housed on each spring(-supported) mount, can controls platelet and wipe advance and retreat, above-mentioned carriage is to be connected on the subframe at the another side of framework with respect to blackboard eraser.Auxiliary-motor is equipped with at this subframe middle part, and its axle is equipped with a cam, by this cam the horizontal small distance of straight line that circular motion becomes blackboard eraser is moved back and forth.The subframe upper and lower side is shaped on chute, and the roller that is contained on the framework can transverse movement in this groove.

Above-mentioned cam can be that an eccentric driving lever is housed on runner, and this driving lever touches with the link stopper rotation that is positioned at frame mid portion and cooperates.

Above-mentioned subframe has the pedestal of a vertical pivot to be connected with a side, and this vertical pivot upper and lower side is equipped with torsion spring presses to blackboard surface with pedestal, and an example of framework is connected with pedestal elasticity by spring.

The motor shaft of main motor is connected with gear by a manual clutch.

Major and minor motor power-supply wire is by two copper bars and each the brush realization of contact with it that are inlaid on the insulation strip.

Blackboard eraser of the present utility model can be automatically along laterally back and forth operation of blackboard surface.The setting of manual clutch in case make power failure, can move with manual blackboard eraser device; The hold down of elasticity that is installed on the vertical pivot can make blackboard eraser to the blackboard application of force; Auxiliary-motor drives each little blackboard eraser at the small distance traverse motion by framework, makes the everywhere person's handwriting bionical effect all be arranged repeatedly by wiping; Little spring is equipped with in every platelet rubdown portion, makes a certain recess platelet of blackboard wipe and can be adjacent to automatically; If need leave the file person's handwriting, with hand slightly cocked the skipping of pedestal got final product during wiping, if need stay certain delegation's person's handwriting, pull the little cam handle of platelet rubdown portion of this row correspondence, then little blackboard eraser breaks away from blackboard surface automatically; Employing is similar to commutator for electric motor brush power supply the principle, has avoided power line to drag the unsafe factor that causes back and forth.The utlity model has degree of cleaning height, write down characters conveniently, safety, advantage such as dustproof.

In the accompanying drawing, Fig. 1 is the utility model embodiment front view, Fig. 2 is an A-A sectional view among Fig. 1, and Fig. 3 is a motor shaft clutch schematic diagram, and Fig. 4 is a blackboard eraser pedestal schematic diagram, Fig. 5 is a blackboard eraser subframe schematic diagram, Fig. 6 is Fig. 5 left view, and Fig. 7 is a blackboard eraser framework schematic diagram, and Fig. 8 is Fig. 7 right view, Fig. 9 is motor electric power-feeding structure figure, and Figure 10 is Fig. 9 B～B sectional view.

Be described further below in conjunction with accompanying drawing.

With reference to Fig. 1, Fig. 2, by bearing plate 6 crossbeam 5 is fixed on the metope above blackboard 7, long tooth bar 4 is equipped with in crossbeam 5 sides, and truss 3 can laterally move along crossbeam 5 by pulley 12, it moves power from the motor 1 that is contained on the truss 3, gear 2 that is connected with motor shaft and tooth bar 4 engagements.At crossbeam 5 two ends the one stroke switch can be installed respectively, when truss 3 these switches of shake-up, motor 1 gets final product antiport, thereby passes through the rotation of gear 2, realizes that truss 3 moves back and forth along crossbeam 5.Connect pedestal 17 in truss 3 lower ends, dust cover 35 is arranged on the pedestal 17, under the cover dust suction dust collect plant 10 is arranged.

With reference to Fig. 3,1 in motor is gone up by spring 14, clutch 11 and is connected gear 2, and this clutch 11 is by last dish 11.1 and lower wall 11.2 concavo-convex cooperations, during power failure, pulling pull bar 16, jacking block 15 will be gone up top on the dish 11.1, spring 14 is compressed, concavo-convex separation, but also erasing handwriting of hand push pedestal at this moment.During incoming call, loosen pull bar 16, under spring 14 effects, the concavo-convex again cooperation of clutch, blackboard eraser can move automatically.

With reference to Fig. 4, blackboard eraser pedestal 17 is fixed on the truss 3 by connecting plate, and the one side has vertical pivot, and support body is rotatable with respect to this axle, and torsion spring device 18 is equipped with at the axle two ends, and support body is exerted pressure to blackboard surface.When desiring to stay certain row person's handwriting, gently pull pedestal and can skip these row.

Fig. 5-Fig. 8 has represented the blackboard eraser structure.An auxiliary-motor 21 is installed at subframe 20 middle parts that are fixed on the pedestal wherein shown in Figure 5, and the runner on it is shaped on eccentric driving lever 22; The back side upper and lower side of subframe 20 also respectively is shaped on chute 18.Fig. 7, the blackboard eraser framework 28 that is connected with pedestal 17 elasticity by spring 34 shown in Figure 8, its on the blackboard surface from top to bottom oblique parallel be arranged with 5-10 piece platelet and wipe 27, little spring 26 all is equipped with at the back side of every platelet wiping 27, little cam 24 respectively is equipped with on its spring(-supported) mount top, and it makes trigger piece shown in Figure 19.When desire keeps certain row or a few capable person's handwriting, pull the trigger piece 9 of correspondence position, platelet is wiped 27 and is broken away from blackboard surface by cam 24 jack-up, when trigger piece 9 resets, is subjected to little spring 26 effects, pulls wiping for a short time and also promptly resets.When blackboard surface has when uneven, be subjected to little spring 26 effects, platelet is wiped 27 and is protracted automatically and retreat, and has guaranteed cleaning of uneven place person's handwriting.Framework 28 upper and lower ends respectively are equipped with trundle 23, and it cooperates with chute 19 on the subframe 20; Relative motor driving lever 22 fixed-site in framework 28 middle parts have block 25, when auxiliary-motor 21 work, driving lever 22 constantly brushes up against block 25, under spring 34 effects, framework 28 drives each platelet and wipes 27 horizontal small distances reciprocating motions, has guaranteed that every place person's handwriting is subjected to repeatedly wiping.

Fig. 9, Figure 10 have represented the electric power-feeding structure that no electric wire drags.A plastic rail groove 29 is installed in a side at crossbeam 5, has two parallel slots 32 on the groove, two parallel copper strips 33 of setting-in in the groove, and connect AC power.One brush 31 that is connected with metal spring leaf 30 is arranged on the every copper strips, and metal spring leaf 32 stretches out and passes through switch 8 from slot 32 and is communicated with main motor 1, auxiliary-motor 21, thereby has omitted easily at the motor power-supply wire that drags middle winding, wearing and tearing, designs simplification.

Claims (7)

1, the automatic wiping arrangement of a kind of blackboard, comprise a crossbeam that tooth bar (4) are housed (5) that is installed in blackboard (7) top, one can be at the upward reciprocal truss (3) that moves of crossbeam (5) by pulley gear (12), main motor (1) is housed on the truss (3), gear on it (2) and tooth bar (4) engagement, truss (3) below also is connected with dust cover (35) and interior blackboard eraser thereof, be connected to dust arrester (10) under the cover, it is characterized in that blackboard eraser is fixed on the blackboard eraser framework (28) that carriage is housed, make framework (23) drive blackboard eraser small distance traverse motion.

2, the automatic wiping arrangement of blackboard according to claim 1 is characterized in that described blackboard eraser can be made up of the little blackboard eraser (27) that polylith is vertically arranged, and spring (26) all is equipped with at every little blackboard eraser (27) back, and a little cam (24) respectively is housed on its spring(-supported) mount.

3, the automatic wiping arrangement of blackboard according to claim 1, it is characterized in that described carriage is framework (28) and is connected on the subframe (20) with respect to the another side of blackboard eraser (27), an auxiliary-motor (21) is equipped with at subframe (20) middle part, its axle is equipped with a cam, by this cam the straight line small distance that circular motion becomes blackboard eraser is moved back and forth; Subframe (20) upper and lower end respectively is shaped on chute (19), and the roller (23) that is contained on the framework can laterally roll in this groove.

4, the automatic wiping arrangement of blackboard according to claim 3 is characterized in that cam can be to adorn an eccentric driving lever (22) on runner, and its position is touched with block (25) rotation that is positioned at framework (28) middle part and cooperated.

5, the automatic wiping arrangement of blackboard according to claim 3, it is characterized in that a subframe (20) and a side have the pedestal (17) of vertical pivot (36) to fixedly connected, this vertical pivot upper and lower side respectively is equipped with torsion spring (18) presses to blackboard surface with pedestal, and a side of framework (28) is connected with pedestal (17) elasticity by spring (34).

6, the automatic wiping arrangement of blackboard according to claim 1 is characterized in that the motor shaft of main motor (1) is connected with gear (2) by a manual clutch (11).

7, the automatic wiping arrangement of blackboard according to claim 1, the power line that it is characterized in that main motor (1), auxiliary-motor (21) is by two copper bars (33) and each brush (31) realization of contact with it that are inlaid in the insulation tank.

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