CN2555541Y - Image scanner with gear speed changing assembly - Google Patents
Image scanner with gear speed changing assembly Download PDFInfo
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- CN2555541Y CN2555541Y CN 02206030 CN02206030U CN2555541Y CN 2555541 Y CN2555541 Y CN 2555541Y CN 02206030 CN02206030 CN 02206030 CN 02206030 U CN02206030 U CN 02206030U CN 2555541 Y CN2555541 Y CN 2555541Y
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Abstract
The utility model discloses an image scanning device, including a driving device, a transmission belt, a scanning component which is installed at the transmission belt and a gear shifting component which is connected with the driving device and the transmission. The driving device drives the transmission belt by being connected with the gear shifting component. The gear shifting component is selectively collocated for ensuring that the driving device can drive the transmission belt at different deceleration ratio to ensure that the scanning component moves at the relevant different speeds to scan.
Description
Technical field
The utility model relates to a kind of image-scanning device, particularly a kind of image-scanning device with gear change assembly.
Background technology
Image-scanning device is common computer peripheral equipment today.Image-scanning device also is called scanner usually, and it is dissimilar to have falt bed scanner and a handly scanner etc.By scanner, we can convert to electronic document such as the data that is stored in photo on the paper, literal, figure, store or do further processing for computer or other electronic equipments.Most scanner has multiple scanning resolution, can comply with different demands, selects to carry out scanning motion for the user.So-called scanning resolution is meant that the image that the scan components unit area on the scanner is captured counts.Count dpi (Dot Per Inch) as its unit and this resolution is many with the per inch picture point.For example 250dpi just represents that scanner will produce 250 picture point logarithmic data at the file per inch that is scanned.
See also Fig. 1, this illustrates the part-structure figure of existing falt bed scanner.Illustrated element comprises stepper motor 11, motor gear 121, first stud gear 122, second stud gear 123, the 3rd speed gear 124, belt pulley 125, driving belt 14 and is placed in scan components 13 on the driving belt 14.Stepper motor 11 is coaxial with motor gear 121, and first stud gear 122 is coaxial with second stud gear 123, and the 3rd speed gear 124 is coaxial with belt pulley 125.In addition, motor gear 121 and first stud gear 122 engagements, second stud gear 123 and 124 engagements of the 3rd speed gear, 125 of belt pulleys and driving belt 14 engagements.By gear 121,122,123,124,125 to each other annexations are driven driving belt 14 as the stepper motor 11 of drive unit, make scan components 13 move action to scan.
Use the annexation of gear 121,122,123,124,125 as shown in Figure 1 and adjust the radius and the number of teeth of each gear, stepper motor 11 can drive scan components 13 with suitable speed under certain rotating speed.Owing to scanning motion is that scan components 13 moves past medium such as paper and carries out with certain speed, therefore under the requirement of different scanning resolutions, scan components 13 must move with different speed.Since and because gear 121,122,123,124,125 has been preset the certain radius and number of teeth, the translational speed of desire change scan components 13 just must change the rotating speed of stepper motor 11.In other words, desire the scanning resolution that reaches different, just must make stepper motor 11 with different rotating speed runnings with existing technology.Yet stepper motor is not to be fit to various rotating speeds, for example when rotating speed exceeds to a certain degree, just has the problem of torsion deficiency.Therefore, the configuration mode of driven sweep assembly 13 like this will be even will cause when low scanning resolution, because stepper motor torsion deficiency still can't reduce the serious consequence of sweep time.
The utility model content
Therefore, when carrying out low-res scanning in order to improve existing scanner, the gear assembly outputting torsion is too small and make the shortcoming that can't reduce sweep time, the utility model provides a kind of image-scanning device with gear change assembly, when the low-res scanning operation, can increase outputting torsion, and then significantly shorten low-res scanning required time.
The purpose of this utility model is to provide a kind of image-scanning device, and it can be optionally at high-res scanning operation or low-res scanning operation, and different gear assembly reduction gear ratio is provided.
For realizing this purpose, the utility model provides a kind of image-scanning device, comprising: drive unit; Driving belt; Scan components is placed on the driving belt; The gear change assembly, the gear change assembly is connected to drive unit and driving belt, drive unit by with being connected of gear change assembly to drive driving belt; By optionally disposing the gear change assembly, make drive unit drive driving belt, and scan components is moved to scan with corresponding friction speed with different reduction gear ratio.
As for the gear change assembly, then can optionally change inner configuration, to form different reduction gear ratio, can under the situation of gear change assembly, produce different output speed driving driving belts in the identical speed of input for drive unit.
The invention also discloses a preferred embodiment, how to provide two kinds of different reduction gear ratio with explanation.In this embodiment, the gear change assembly has drive gear set, belt-gear combination, first train of reduction gears, second train of reduction gears and switching platform.First train of reduction gears and second train of reduction gears are placed on the switching platform.By moving or rotating switching platform, select a train of reduction gears in first train of reduction gears or second train of reduction gears to mesh with drive gear set and belt-gear combination.Because drive gear set is connected to drive unit, and belt-gear combination is connected to driving belt, therefore, when the train of reduction gears of selecting different reduction gear ratio and its engagement, just can produce different reduction gear ratio.
Therefore, drive unit as stepper motor, can drive driving belt and produce different output speeds importing identical speed under the situation of gear change assembly.The requirement of different scanning resolution so can be provided, can avoid the problem of drive units such as stepper motor again in high rotating speed torsion deficiency.
Description of drawings
Fig. 1 is the part transmission synoptic diagram of prior art scanner;
Fig. 2 is an embodiment synoptic diagram of the present utility model;
Fig. 3 A is the stereographic map of illustrated embodiment;
Fig. 3 B is the vertical view of illustrated embodiment;
Fig. 4 A is the stereographic map of another configuration of illustrated embodiment;
Fig. 4 B is the vertical view of another configuration of illustrated embodiment.
Embodiment
Please referring to Fig. 2.The utility model discloses a kind of image-scanning device.This image-scanning device has drive unit 21, gear change assembly 22, scan components 23 and driving belt 24.Drive unit 21 is connected with gear change assembly 22, and driving belt 24 also is connected with gear change assembly 22.Drive unit 21 by with being connected of gear change assembly 22, to drive this driving belt 24.Herein, gear change assembly 22 can switch the transmission component of different resolutions, makes to switch to the transmission component of high-res when the scanning very high resolution image, and switch to the transmission component of low-res when scanning low-res image.23 of scan components are placed on the driving belt 24, and when driving this driving belt 24, scan components 23 just can move, and so just can carry out scanning motion.
Different scanning resolutions needs scan components to scan with different speed.For example high-res needs scan components to move past scanning medium with slower speed, and low-res then can bear scan components and move past scanned medium with fast speeds.Therefore, we can under the input speed that does not change drive unit 21, realize different scan components 23 translational speeds by the adjustment of gear change assembly 22 internal configurations.
The embodiment of drive unit 21 comprises the stepper motor equal power device.Because devices such as stepper motor have the situation of torsion deficiency under high rotating speed.Therefore, the setting of this gear change assembly 22 makes drive units 21 such as stepper motor under same rotating speed, still can accomplish the translational speed of different scan components 23, to realize the requirement of different scanning resolutions.So not only solved the problem of drive units such as stepper motor 21 torsion deficiencies, can make low scanning resolution simultaneously again really so that the time is finished scanning operation faster.
It must be noted that the embodiment of scan components 23 comprises the assembly that utilizes charge coupled cell (CCD) or contact type image sensing element scanning elements such as (CIS) to constitute.
In addition, gear change assembly 22 can be done by various gear change structures in fact.And, it is by the switching of internal configurations, for example via the internal drive platform to move or rotation mode, utilize manual or automatic mode to adjust, mesh different train of reduction gears, can obtain position one (as Fig. 3 A with shown in Fig. 3 B) and position two two kinds of different results such as (shown in Fig. 4 A and Fig. 4 B), dispose to realize different reduction gear ratio.The utility model herein,
Position one: the transmission result who obtains 600dpi
Position two: the transmission result who obtains 2400dpi.
In order to illustrate further the structure of gear change assembly 22, below with Fig. 3 A, Fig. 3 B, Fig. 4 A and Fig. 4 B an embodiment with gear change assembly of two reduction gear ratio is disclosed.
Please referring to Fig. 3 A, Fig. 3 B, Fig. 4 A and Fig. 4 B.The section construction that this four figure discloses the utility model one preferred embodiment vertical view and stereographic map of (position one and position two) under different reduction gear ratio configurations.In this embodiment, image-scanning device comprises stepper motor 31, gear change assembly 32, scan components 33 and the driving belt 34 as drive unit.Scan components 33 is placed on the driving belt 34.Gear change assembly 32 comprises first train of reduction gears 321, second train of reduction gears 322, switching platform 323, as the motor gear 324 and the belt-gear combination 325 of drive gear set.
Mandatory declaration be, in this embodiment, though only utilize a motor gear 324 to be connected with stepper motor 31, rotate the input power that brings to accept stepper motor 31, the utility model also can utilize the gear connecting mode of a plurality of equivalences to realize similar effect.
In addition, in the embodiment shown, belt-gear combination 325 comprises belt gear 3251 and coaxial belt pulley 3252, and connects driving belts 34 driving by belt pulley 3252, but the utility model also can utilize the gear mode of connection of a plurality of equivalences to realize similar effect.
First train of reduction gears 321 comprises the first input gear 3211 and first output gear 3212.The first input gear 3211 is coaxial with first output gear 3212, and the number of teeth of the first input gear 3211 is more than the number of teeth of first output gear 3212.
In one configuration of the position of Fig. 3 A and Fig. 3 B, the first input gear 3211 is meshed with motor gear 324.Simultaneously, first output gear 3212 is meshed with belt gear 3251.When stepper motor 31 begins to rotate, at first drive motor gear 324.Then, motor gear 324 drives the first input gear 3211, the first input gear 3211 drives first output gear 3212, first output gear 3212 drives belt gear 3251, belt gear 3251 drives belt pulley 3252, belt pulley 3252 drives driving belt 34, thereby scan components 33 generations move forward into line scanning.
In this embodiment, first train of reduction gears 321 and second train of reduction gears 322 are to be placed on the switching platform 323.When we optionally moved the position one of Fig. 3 A and Fig. 3 B switching platform 323 or turn to position two as Fig. 4 A and Fig. 4 B, we can be meshed second train of reduction gears 322 with motor gear 324 and belt pulley 3251.
Second train of reduction gears 322 comprises the second input gear 3221 and second output gear 3222.The second input gear 3221 is coaxial with second output gear 3222, and the number of teeth of the second input gear 3221 is more than the number of teeth of second output gear 3222.
When we move the Location-to-Location two of switching platform 323, in the time of shown in Fig. 4 A and Fig. 4 B, the second input gear 3221 is meshed with motor gear 324.Simultaneously, second output gear 3222 is meshed with belt gear 3251.When stepper motor 31 begins to rotate, at first drive motor gear 324.Then, motor gear 324 drives the second input gear 3221, the second input gear 3221 drives second output gear 3222, second output gear 3222 drives belt gear 3251, belt gear 3251 drives belt pulley 3252, belt pulley 3252 drives driving belt 34, thereby scan components 33 generations move forward into line scanning.
The number of teeth of supposing motor gear 324 is that the number of teeth of 10, the first input gear is that the number of teeth of 40, first output gear is 10, the number of teeth of belt gear is 60, then under the configuration of Fig. 3 A and Fig. 3 B, the reduction gear ratio of gear change assembly 32 is: (40/10) * (60/10)=24.In addition, the number of teeth of supposing the second input gear is that the number of teeth of 20, second output gear is 10, and then under the configuration of Fig. 4 A and Fig. 4 B, the reduction gear ratio of gear change assembly 32 is: (40/20) * (60/10)=12.
In other words, our number of teeth that can change the first input gear 3211, first output gear 3212, the second input gear 3221, second output gear 3222 realizes different reduction gear ratio.Even stepper motor 31 provides power with identical rotating speed, the still configuration of speed gear assembly whereby (position one and position two) produces two kinds of different driving belts 34 translational speeds, uses for two kinds of different scanning resolutions.Therefore, the configuration by switching platform 323 and first train of reduction gears 321, second train of reduction gears 322 has not only solved the problem of stepper motor 31 in high rotating speed torsion deficiency, has also positively increased the speed of scanning.
What must particularly point out is, though provide two kinds of reduction gear ratio with two train of reduction gears 321,322 and switching platform 323 in this illustrative embodiments, but those of ordinary skills should suitably adjust the structure of switching platform, adjust different scanning resolutions in the mode of automatic or manual, in addition, the gear change assembly also gear combination of available equivalents is achieved, and is not limited to the structure that illustrative embodiments discloses.And,, should be able to provide the gear change assembly that surpasses two kinds of reduction gear ratio by suitable adjustment.The design of these variations also should belong to scope of the present utility model.
By the detailed description of above specific embodiment, be to wish to know more to describe feature of the present utility model and spirit, and above-mentioned disclosed specific embodiment is not the restriction to the utility model scope.On the contrary, above-mentioned explanation and various change and equivalent are all the claimed scope of the utility model.Therefore, scope of the present utility model should be done the broadest explanation according to above-mentioned explanation, and contains change and equivalent that institute might equalization.
Claims (10)
1. an image-scanning device comprises: drive unit; Driving belt; Scan components is placed on the described driving belt; It is characterized in that described image-scanning device also comprises: the gear change assembly, described gear change assembly is connected to described drive unit and described driving belt, described drive unit by with being connected of described gear change assembly to drive described driving belt; By optionally disposing described gear change assembly, make described drive unit drive described driving belt, and described scan components is moved to scan with corresponding friction speed with different reduction gear ratio.
2. image-scanning device as claimed in claim 1 is characterized in that, described gear change assembly comprises: drive gear set, form by at least one gear, and be connected to described drive unit; Belt-gear combination is made up of at least one gear, is connected to described driving belt; First train of reduction gears is made up of at least one gear; And second train of reduction gears, form by at least one gear; Wherein, when described first train of reduction gears optionally is meshed with described drive gear set and described belt-gear combination, described drive unit drives described driving belt with first reduction gear ratio, and, when described second train of reduction gears optionally was meshed with described drive gear set and described belt-gear combination, described drive unit drove described driving belt with second reduction gear ratio.
3. image-scanning device as claimed in claim 2, it is characterized in that, described gear change assembly comprises switching platform, settle described first train of reduction gears and described second train of reduction gears, move or rotate described switching platform by selectivity, described first train of reduction gears is meshed with described drive gear set and described belt-gear combination, or described second train of reduction gears is meshed with described drive gear set and described belt-gear combination.
4. image-scanning device as claimed in claim 3 is characterized in that, described switching platform mobile comprises rotation.
5. image-scanning device as claimed in claim 3, it is characterized in that, described first train of reduction gears comprises the first input gear and first output gear, and the described first input gear is coaxial with described first output gear, the number of teeth of the described first input gear is more than the number of teeth of described first output gear, when the described first input gear is meshed with described drive gear set, and when described first output gear was meshed with described belt-gear combination, described drive unit drove described driving belt with described first reduction gear ratio.
6. image-scanning device as claimed in claim 5, it is characterized in that, described second train of reduction gears comprises the second input gear and second output gear, and the described second input gear is coaxial with described second output gear, the number of teeth of the described second input gear is more than the number of teeth of described second output gear, when the described second input gear is meshed with described drive gear set, and when described second output gear was meshed with described belt-gear combination, described drive unit drove described driving belt with described second reduction gear ratio.
7. image-scanning device as claimed in claim 2 is characterized in that described belt-gear combination comprises belt pulley, is connected to described driving belt, drives moving of described driving belt.
8. image-scanning device as claimed in claim 2 is characterized in that, described drive unit is a stepper motor.
9. image-scanning device as claimed in claim 2 is characterized in that described scan components comprises charge coupled cell.
10. image-scanning device as claimed in claim 2 is characterized in that described scan components comprises the contact type image sensing element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02206030 CN2555541Y (en) | 2002-02-08 | 2002-02-08 | Image scanner with gear speed changing assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02206030 CN2555541Y (en) | 2002-02-08 | 2002-02-08 | Image scanner with gear speed changing assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2555541Y true CN2555541Y (en) | 2003-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02206030 Expired - Fee Related CN2555541Y (en) | 2002-02-08 | 2002-02-08 | Image scanner with gear speed changing assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2555541Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115112B (en) * | 2006-07-28 | 2011-06-15 | 佳能株式会社 | Image reading apparatus and method for controlling the same |
| CN101749374B (en) * | 2008-12-19 | 2012-05-09 | 金宝电子工业股份有限公司 | Transmission force switching mechanism for business machine |
-
2002
- 2002-02-08 CN CN 02206030 patent/CN2555541Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115112B (en) * | 2006-07-28 | 2011-06-15 | 佳能株式会社 | Image reading apparatus and method for controlling the same |
| US8259366B2 (en) | 2006-07-28 | 2012-09-04 | Canon Kabushiki Kaisha | Image reading apparatus |
| CN101749374B (en) * | 2008-12-19 | 2012-05-09 | 金宝电子工业股份有限公司 | Transmission force switching mechanism for business machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030611 Termination date: 20100208 |