CN103507497A - Blackboard - Google Patents

Abstract

The invention relates to the field of teaching, in particular to a blackboard. The flexible blackboard is wound around a winding wheel and an unwinding wheel. A writing blackboard area is located between the winding wheel and the unwinding wheel. When words are written in the writing blackboard area fully, a middle shaft is rotated, the winding wheel winds up the writing blackboard area and is wound with the writing blackboard area, and the unwinding wheel is driven simultaneously to release a new writing blackboard area. The blackboard is low in price, simple, practical, capable of effectively preventing dust from flying around, and convenient to install, the words and graphs can be reserved, and the blackboard can be used for improving teaching quality.

Description

A kind of blackboard

Technical field

The present invention relates to teaching field, specifically refer to a kind of blackboard.

Background technology

Blackboard is as one of indispensable apparatus in classroom, and the blackboard that can record class-teaching of teacher personal letter is the emphasis that we pay close attention to always.Blackboard from the earliest with blacking, spread upon the hard objects such as plank, cement surface, to the water mill glass of the nineties, present color coated steel sheet, composite panel.Epoch are improving, and it is various that the kind of blackboard also starts the complexity that becomes.If fine classification, existing blackboard type on market nearly more than ten is planted unexpectedly.From so many blackboards, select the blackboard of suitable student's situation, be not a simple thing.At present, known blackboard usable floor area is limited, must wipe and could continue to use while writing full word, some character and graphic also will continue in class to use, but limited having to of blackboard area wipes, giving attends class makes troubles, and sassafras blackboard is wasted time and energy, dust from flying affects the effect of attending class.

Summary of the invention

Soft blackboard is wrapped in to take-up pulley and puts on belt wheel, take-up pulley is to write district's blackboard with putting belt wheel middle, when Dang Ci district character calligraph has been expired, rotating middle shaft take-up pulley is packed up this part to be wrapped on take-up pulley, drive simultaneously put belt wheel release new write district's blackboard.

Technical scheme of the present invention:

, it comprises: bearing (1), put belt wheel (2), the soft blackboard of tensioning apparatus (3) (4), backing plate (5), axis (6), take-up pulley (7).

It is upper that two axis (6) are arranged on two end bearings (1), and by the slotted hole on bearing (1), bearing (1) is fixing with bolt, soft blackboard (4) installs respectively to have formed on upper and lower two axis (1) puts belt wheel (2) and take-up pulley (7).Unclamp the set bolt of axis (6) bearing above, regulate tensioning apparatus (3) to make to put belt wheel (2) and take-up pulley (7) and write the set bolt that district's blackboard level of tightness is tightened bearing (1) after suitable again.

Beneficial effect of the present invention:

1, cheap, simple and practical;

2, effectively prevent that powder from dispersing everywhere;

3, be convenient to install;

4, character and graphic can also remain, and convenient improving the quality of teaching processed use later.

Accompanying drawing explanation

Fig. 1 is schematic diagram of the present invention.

The specific embodiment of the present invention

Upper and lower two long for the axis of 1m (6) is arranged on two ends long, be 50cm, wide on the bearing of 20cm (1), according to writing district's size, adjust the distance between two axis (6), by the slotted hole on bearing (1), bearing (1) is fixing with bolt, by wide for 1.2m, longly for the soft blackboard (4) of 10m is wrapped in respectively up and down on two axis (6), has formed and put belt wheel (2) and take-up pulley (7).Unclamp the set bolt of axis (6) bearing (1) above, regulate tensioning apparatus (3) to make to put belt wheel (2) and take-up pulley (7) centre and write the set bolt that district's blackboard level of tightness is tightened bearing (1) after suitable again.Long for 1.5m, it is wide that for the backing plate of 1m (5) is used for preventing from writing district's blackboard, notch distortion is excessive at present writing.

Operation principle of the present invention:

While using blackboard, when writing the soft blackboard in district (4) writing language of the Manchus word in the middle of putting belt wheel (1) and take-up pulley (7), rotating middle shaft (6) makes take-up pulley (7) this part be packed up to be wrapped in take-up pulley (7) upper, drive simultaneously put belt wheel (2) release new write district's blackboard.Owing to putting, be wound around abundant soft blackboard (4) on belt wheel (2), so blackboard writing usable floor area is enough large, the writing writing on the blackboard can be wiped, and has solved the limited difficulty of general blackboard usable floor area.

Claims (3)

1. a blackboard, it comprises: bearing (1), put belt wheel (2), the soft blackboard of tensioning apparatus (3) (4), backing plate (5), axis (6), take-up pulley (7).

2. a kind of blackboard according to claim 1, is characterized in that, plate face is comprised of the soft blackboard (4) of several meters long.

3. a kind of blackboard according to claim 1, is characterized in that, soft blackboard (4) is supported by backing plate (5) below.

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