CN1167033C - Scanning device with lead screw - Google Patents

Abstract

A scanner is composed of a casing, a transparent platform for putting the document to be scanned, a front and back guide screw fixed in said casing, a scan module on said guide screw, a gear unit on said guide screw and with at least one convex tooth on its inner surface, and a motor on one side of gear unit for driving said gear unit forward and backward and moving synchronously. When the motor drives the gear device, the convex teeth of the gear device move along the lead screw to enable the gear device to move back and forth along the lead screw, and the scanning module is pushed on the lead screw to enable the scanning module to scan the document in the shell.

Description

Scanning unit with lead screw

technical field

The invention provides a scanning device, especially a scanning device provided with a lead screw.

Background technique

With the advancement of software and hardware technology, scanners play a pivotal role in the input of graphics and images. Among various scanners, flatbed scanners are the most commonly used scanners. In the platform scanner, the scanning module is installed under a transparent platform in a manner that can be pulled back and forth to scan documents placed on the transparent platform. Since the scanning module itself does not have any power, it needs to rely on transmission mechanisms, such as belt loops or steel cables installed on multiple round wheels to maintain its horizontal balance, fix the direction of document scanning, and drive back and forth to scan files on transparent platforms. The structures of these transmission mechanisms are usually very complicated, which is time-consuming and laborious in system assembly and maintenance, and belt loops or steel cables cannot stably maintain the scanning module on a fixed track. In addition, the motor is generally used to drive the transmission mechanism so that the transmission mechanism drives the scanning module, which consumes a lot of power.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a scanning device, which is provided with a lead screw to simplify the structure of the transmission mechanism, and the scanning module can be moved forward and backward along the lead screw by the motor to drive the scanning module to reduce power consumption, so that Solve the above problems.

In order to achieve the above object, the present invention provides a scanner, which includes: a housing with a transparent platform above it for placing documents to be scanned; a lead screw arranged in the front and rear directions, fixed in the housing, The surface of the lead screw is provided with an annular thread; a scanning module is set on the lead screw and is used to move back and forth along the lead screw to scan the document; a gear device is set on the lead screw On the screw rod, at least one protruding tooth is arranged on its inner side for interacting with the annular thread on the lead screw rod; and a motor is arranged on one side of the gear device for driving the gear device back and forth and move synchronously with the gear unit; wherein when the motor drives the gear unit, the teeth of the gear unit move along the annular thread on the lead screw to allow the gear unit to move along the The lead screw moves forward and backward, and the gear device pushes the scanning module on the lead screw so that the scanning module can scan the document forward and backward in the casing.

Description of drawings

Fig. 1 is a schematic diagram of the scanner of the present invention.

FIG. 2 is a schematic diagram of the scanning module in the scanner of FIG. 1 being socketed on the lead screw.

FIG. 3 is a schematic diagram of the gear device in the scanner of FIG. 1 being sleeved on the lead screw.

FIG. 4 is a component diagram of the gear device of FIG. 3 .

FIG. 5 is a schematic diagram of a gear pressing plate of the gear device of FIG. 4 .

Detailed ways

See Figure 1 and Figure 3. FIG. 1 is a schematic diagram of the scanner 10 of the present invention. FIG. 2 is a schematic diagram of the scanning module 12 in the scanner 10 socketed on the lead screw 14. FIG. 3 is a schematic diagram of the gear device 16 of the scanner 10 socketed on the lead screw 14. schematic diagram.

As shown in FIGS. 1 to 3 , the scanner 10 includes a housing 18 above which a transparent platform 20 is provided for placing documents 22 to be scanned. A lead screw 14 arranged in the front and rear direction is fixed in the housing 18 . The scanning module 12 is arranged on the lead screw 14 to move back and forth along the lead screw 14 to scan the document 22, a gear device 16 is arranged on the lead screw 14, and a motor 24 is arranged on one side of the gear device 16 for forward and backward The gear unit 16 is driven and moved synchronously with the gear unit 16 .

Please refer to FIG. 4 and FIG. 5 , FIG. 4 is a component diagram of the gear device 16 , and FIG. 5 is a schematic diagram of the gear pressing plate 28 of the gear device 16 . The gear device 16 includes a gear element 26 , a gear pressing plate 28 and a gear bushing 30 for combining the gear element 26 and the gear pressing plate 28 on the lead screw 14 . The surface of the lead screw 14 is provided with an annular thread 34, and the inner surface of the gear plate 28 is provided with two convex teeth 32, which are used to interact with the annular thread 34 on the lead screw 14, and the motor 24 is in contact with the gear element 26. The gear unit 16 is driven.

When the motor 24 drives the gear unit 16, the protruding teeth 32 on the inner surface of the gear platen 28 move along the annular thread 34 on the lead screw 14 so that the gear unit 16 can move back and forth along the lead screw 14, and the gear unit 16 pushes the scanning module 12 on the lead screw 14 so that the scanning module 12 can scan the document 22 back and forth in the casing 18 .

Within the scope of the present invention, the two protruding teeth 32 on the inner surface of the gear pressing plate 28 can be replaced by one protruding tooth or a plurality of protruding teeth, and even the multiple protruding teeth can be combined into an annular thread, which corresponds to the lead screw 14 The annular thread 34 on the lead screw 14 is used to interact with the annular thread 34 on the surface of the lead screw 14 . In addition, the lead screw 14, the gear device 16 and the motor 24 can not only be arranged at one end of the scanning module 12 as shown in FIG. Group 12.

Compared with the conventional scanner, the scanning module 12 of the scanner 10 of the present invention moves back and forth along the lead screw 14 , so the scanning module 12 moves in the casing 18 very stably. And because the device driven by the motor 24 is the gear device 16 instead of the lead screw 14 , the power supplied by the motor 24 is very limited.

Claims (5)

1. A scanner, characterized in that it comprises: A housing, above which is provided with a transparent platform for placing documents to be scanned; A lead screw arranged in the front and rear directions is fixed in the housing, and the surface of the lead screw is provided with an annular thread; a scanning module, arranged on the lead screw, used to move forward and backward along the lead screw to scan the document; a gear set on the lead screw having at least one protruding tooth inside for interacting with the annular thread on the lead screw; and A motor, located on one side of the gear unit, is used to drive the gear unit back and forth and move synchronously with the gear unit; Wherein when the motor drives the gear device, the protruding teeth of the gear device move along the annular thread on the lead screw so that the gear device can move back and forth along the lead screw rod, and the The gear device pushes the scanning module on the lead screw so that the scanning module can scan the document back and forth in the casing. 2. The scanner of claim 1, wherein the inner side of the gear unit is provided with an annular thread formed by a plurality of protruding teeth for interacting with an annular thread on the surface of the lead screw . 3. The scanner as claimed in claim 1, wherein said gear device comprises a gear element, a gear pressing plate and a gear bushing for combining the gear element and the gear pressing plate on the lead screw . 4. The scanner of claim 3, wherein the protruding teeth protrude from an inner side surface of the gear platen. 5. The scanner of claim 3, wherein the motor is in contact with the gear member to drive the gear arrangement.

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