TW589439B - A gear module and the driving method with the gear module for a scan head - Google Patents

Abstract

A gear module and the driving method with the gear module for a scan head of a scanner. The gear module includes a shaft, a first active gear, a second active gear, a first driven gear, a second driven gear and a passive gear. The first gear and the second gear are mounted on the shaft, and rotating with the shaft. Further the first driven gear clenches the teeth of the first active gear each other, and circling the first active gear. The second driven gear clenches the teeth of the second active gear each other, and circling the second active gear. The passive gear clenches the teeth with one of the two driven gears so that the scan head can operate scan by the first active gear, the first driven gear and the passive gear and operate home back by the second active gear, the second driven gear and the passive gear.

Description

589439 _ Case No. 91125112_ Year Month Date__ V. Description of the invention (1) The present invention relates to a gear set structure and a method for driving a scanning module using the structure, and in particular to a method for selecting by two driving gears The passive gear is controlled in a controlled manner to change the forward and reverse speed of the passive gear, and the gear set structure by which the speed of the scanning module is controlled, and the method of driving the scanning module by using this structure. In a scanning system, an optical scanning module using an optical imaging architecture and image capturing technology is the most common scanning tool. The optical imaging architecture includes, for example, a light source, multiple reflective lenses, and a lens. The image capturing technology is An image capture component is used to capture the image of a document, and then the image of the document is converted into a digital material 'for transmission to a computer' and edited, printed, or faxed by the computer. Among many consumer electronics products, the scanner has become an indispensable computer peripheral device due to the continuous improvement of scanning quality and scanning speed. Generally speaking, scanners on the market are mainly composed of a housing, a scanning module, a driving device, and a linear guide mechanism. The housing has a light transmitting platform, and the scanning module is arranged in the housing, and the scanning module is moved along a scanning direction to scan a document on the light transmitting platform. In addition, the driving device is arranged in the housing, and the driving device is used to drive the scanning module. The driving source of the driving device is, for example, a stepper motor, and the stepper motor is driven by a drive belt. And a belt pulley (B e 1 tpu 1 1 ey) is connected with the scanning module to control the speed of the scanning module. In addition, the linear guide mechanism is arranged in the housing and is connected with the scanning module. The linear guide mechanism is, for example, an axis rod, and its axial direction is parallel to the scanning direction of the scanning module, so that the scanning module can be guided linearly. mechanism

9664twf1.ptc Page 7 589439 _case number 91125112_ year month day__ V. Guidance of the invention description (2), and it moves steadily in the scanning direction. The conventional stepping motor is provided with a driving gear, which is located on the pivot of the stepping motor to output the power generated by the stepping motor. The driving gear is connected to a passive gear and makes the passive gear rotate relatively. In addition, a belt pulley is arranged on the axis of the driven gear, for example, a belt is sleeved on the belt pulley, and the belt drives the scanning module by the rotation of the belt pulley. Therefore, when the passive gear rotates, the belt pulley rotates relatively and drives the belt at the same time, so that the power of the stepping motor is transmitted to the scanning module through the belt and the pulley to drive the scanning module to move in the scanning direction and along the Move in the direction of the home position. It is worth noting that the transmission gear ratio (Gear rati 〇) between the driving gear and the passive gear is kept constant under the constant number of teeth of both the driving gear and the passive gear. Therefore, when the motor rotates forward and reverse At the same time, the speed of forward and backward movement before the transmission from the belt and the pulley to the scanning module is the same, that is, the moving speed of the scanning module during scanning and the moving speed of returning to the origin are the same. In particular, the moving speed of the scanning module to the origin cannot be accelerated, which will cause the waiting time for the scanning module to return to the origin to be too long, and the user must wait for a long time before the next scanning operation. This will reduce work efficiency. Therefore, the object of the present invention is to provide a gear set structure suitable for a scanner, in which the scanning module changes the speed by the gear set structure of different transmission gear ratios, so that the speed and speed of the scanning module moving along the scanning direction and along the scanning direction The speed of movement toward the origin is different. Another object of the present invention is to provide a method for driving a scanning module.

9664twf1.ptc page 8 589439 _ case number 91125112_ year month day__ V. Description of the invention (3) Used for a scanner, in which the scanning module uses a gear set structure with different transmission gear ratios to change the speed so that scanning The speed of the module moving in the scanning direction is different from the speed of moving in the direction of the origin. To achieve the above object of the present invention, a gear set structure is proposed, which includes a pivot shaft, a first driving gear, a second driving gear, a first driven gear, a second driven gear, and a passive gear. Among them, the first driving gear and the second driving gear train are set on a pivot shaft, and the pivot shaft can rotate as the center. In addition, the first driven gear train is sprayed with the first driving gear, and the first driven gear can move around the first driving gear, and the second driven gear train is meshed with the second driving gear, and the second driven gear The moving gear can move around the periphery of the second driving gear. The passive gear train is meshed with one of the first driven gear and the second driven gear. In order to achieve the above object of the present invention, a method for driving a scanning module is proposed. The scanning module is driven by a gear set structure. The gear set structure includes a pivot shaft, a first driving gear, a second driving gear, and a first driving gear. A driven gear, a second driven gear and a passive gear. The first driving gear and the second driving gear train are set on a pivot shaft and can rotate with the pivot as the center. The first driven gear train is meshed with the first driving gear, and the first driven gear can surround the first driving gear. The periphery of the gear moves, the second driven gear train meshes with the second driving gear, and the second driven gear can move around the periphery of the second driving gear. The passive gear train is meshed with one of the first driven gear and the second driven gear, and the scanning module is fixed on a transmission member. The passive gear can drive the transmission member, thereby driving the scanning module to move, and driving the scanning module. The group method includes at least:

9664twf1.ptc Page 9 589439 _ Case No. 91125112_ year month day__ V. Description of the invention (4) Step 1: Drive the pivot shaft in a first direction so that the first driving gear and the second driving gear go to the first Rotating in one direction further drives the first driven gear to move in the first direction along the periphery of the first driving gear, so that the first driven gear meshes with the passive gear. At this time, the passive gear, the transmission member and the scanning module will be driven. , The scanning action is performed, and the second driven gear train moves along the periphery of the second driving gear to the first direction, so that the second driven gear and the passive gear are separated from each other; and Step 2 · the driving pivot The shaft rotates in a second direction, so that the first driving gear and the second driving gear rotate in the second direction, thereby driving the second driven gear to move in the second direction along the periphery of the second driving gear, so that the first The two driven gears mesh with the driven gear. At this time, the driven gear, the transmission member and the scanning module will be driven to return to the origin. The first driven gear train moves along the periphery of the first driven gear to the second. The direction movement makes the first driven gear and the driven gear appear disengaged. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to make a detailed description as follows: Symbols of the drawings: 100 teeth-W group Structure 110 Pivot 1 12 First driving gear 1 14 Second driving gear 116 First driven gear 118 Second driven gear

9664twf1.ptc Page 10 589439 _ Case No. 91125112_ Year Month Day _ V. Description of the invention (5) 120 Passive gear 200 Scan module 2 10 Transmission member 2 12 Belt 2 14 Pulley 302 Drive gear 304 Drive gear 3 10 Structure Body 31 2 Arc-shaped channel 314 Rod rods R, R1, R2 Radius preferred embodiment FIG. 1 shows a schematic diagram of a gear set structure according to a preferred embodiment of the present invention. Referring to FIG. 1, the gear set structure 100 includes a pivot shaft 11, a first driving gear 112, a second driving gear 114, a first driven gear 116, a second driven gear 118, and A passive gear 120. Among them, the first driving gear 112 and the second driving gear 114 are mounted on the pivot shaft 110 and can be rotated around the pivot shaft 110 to output power generated by a motor (not shown). In addition, the first driven gear 116 is meshed with the first driving gear 112 and relatively rotates as the first driving gear 112 rotates, and the first driven gear 1 1 6 may be along the first arc-shaped channel 1 3 0 while moving around the first driving gear 112, the second driven gear 118 is sprayed with the second driving gear 114, and relatively rotates as the second driving gear 118 rotates, and the second driven gear Gear 1 1 8 can follow the second curved channel 1 4 0

9664twf1.ptc Page 11 589439 Case No. 91125112 V. Description of the invention (6) The circumference of the second driving gear 114 is recognized as "zero" and the first driven gear i 16 and the second 'moving movement: upper U movement Tooth: Close, that is, when the passive gear 120 and the first driven gear ^ * * 入 'one of the meshed gear 120 and the second driven gear 118 mesh with each other at Ί16! The passive gear is evil when the passive gear 120 and the second driven gear il8〇 ^ are disengaged. On the contrary, the combination of the passive gear 120 and the first driven gear 116 is described above. The present invention is different from the conventional one. ^ 〇 Structure 1 00 is the transmission gear ratio of the first driving gear 丨 12, flute, and the gear set passive gear 120 of the present invention / moving gear 1 16 and or the second driving gear 114, the first Secondly, you can know the transmission gear ratio of the drawing group 200, the wheel 120, the number of teeth of the belt 118, the gear 118 and the passive-to-active gear 112; Π 2 module 2000. The number of teeth of the first driven gear 116 may be greater than the number of teeth of the _ ^ j114th. In the best case, the number of teeth of the toothed gear 116 of the first driving gear is equal to the number of the first driven gear 1 1 8 on the number of the second driving tooth. ^ The number of teeth of wheel Η 4 is added to the second :: Let's describe the method of using the above-mentioned gear set structure 10 to drive the sweep #set. Please refer to FIG. 2A, which shows the schematic diagram along the first side: ¾ the structure of the die wheel set, in which the scanning module 200 is fixed on the first transmission tooth 2 1 0, and the transmission member 2 1 〇 For example, it is composed of a belt 2 2 and a wheel 214, and the passive gear 2 20 can drive the transmission member 2m and drive the movement of the scanning module 2000. It is worth noting that when the pivot 丨 '1〇1 rotates in the main first direction D1, for example, when rotating counterclockwise, a driving gear 112 and a second driving gear 114 are driven to rotate in the first direction D1 at the same time.

589439

Correction, and the first driven gear 116 is moved along the periphery of the first driving gear 112 to f ^ D1 to a first end portion 132 of the first arc-shaped channel 130 so that the first driven gear 114 meshes with the passive gear 120. At this time, the passive gear 120, the transmission member 21 and the scanning module 2 00 will be driven, and the scanning action will be performed. In addition, the first driven gear 118 will follow the second driving gear. The periphery of 114 is moved in the first direction D 1 to a second end portion 1 4 4 ′ of the second arc-shaped channel 丨 4 〇 so that the second driven gear 丨 丨 8 and the passive gear 丨 2 〇 appear. status.

Next, please refer to FIG. 2B, which shows a schematic diagram of the structure of the gear set rotating in the second direction. When the pivot 110 rotates in the second direction D2, for example, when it rotates clockwise, it drives the first drive at the same time. The gear 丨 丨 2 and the second driving gear 114 rotate in the second direction D2, thereby driving the second driven gear 118 to move along the periphery of the second driving gear 114 to the second direction D2 to a first of the two arc-shaped channels 140. One end part 142, so that the second driven gear 118 and the passive gear 1 2 0 are fed. 'At this time, the passive gear 1 2 0, the transmission 2 1 0 and the scanning module 2 0 0 are returned to the origin. action. In addition, the first: the moving gear 116 moves along the periphery of the first driving gear 112 in a second direction ^ 5 to a second end portion of the first solitary channel 130 34, so that the first slave wheel 1 16 and the passive gear 1 2 0 are in a state of disengagement. W According to the above description, 'under the condition that the rotation speed of the motor driving pivot in the first direction is the same as the rotation speed in the second direction, the scanning module can be driven by the gear set structure of two different transmission gear ratios. Scan at a different speed or return to the origin. For example, as shown in Figure 2A of Z, the first driving gear with fewer teeth is used to drive the scanner.

9664twf1.ptc Page 13 589439 _ Case No. 91125112_ Year Month ___ V. Description of the invention (8) The scanning module 2 0 0, and the scanning module 2 0 0 can be driven by a gear set structure with a lower transmission rate. Driven, the scanning action is performed at a low speed to improve the scanning resolution. As another example, as shown in FIG. 2B, the scanning module 2 0 is driven by the second driving gear 114 having a larger number of teeth, and the scanning module 2 0 can be driven by a gear set structure with a higher transmission rate. Driven, the operation of returning to the origin can be performed at a high speed, thereby saving the waiting time for the scanning module 2000 to return to the origin. Therefore, the time for the user to wait for the next scanning operation can be reduced, which will increase work efficiency. Please refer to Figures 3 and 4, where Figure 3 is a schematic diagram showing the movement of the driven gear in a structure, especially the structure has two curved channels, and Figure 4 shows the curved channels of the structure A schematic cross-section along the AA curve. Please refer to FIG. 3. In this embodiment, in order to make the driven gear 302 and the driving gear 3 0 4 present a good meshing state, and the driven gear 3 0 2 can surround the driving gear 3 in the best case. 0 4 moves around, in particular, the driven gear 3 0 2 is assembled on a structure 310, wherein the structure 310 has two arc-shaped channels 3 1 2 located on both sides of the structure 3 1 0 (such as the first 4), and the radius of curvature R of the arc-shaped channel 312 is equal to the radius R1 of the driving gear 304 and the radius R2 of the driven gear 3 0 2 so that the driving gear 3 0 4 and the driven gear 3 A good meshing state is shown between 0 and 2. In addition, please refer to FIG. 4, the driven gear 3 0 2 is fixed on a rod 314 and can be rotated around the rod 314 as the center, and both ends of the rod 3 1 4 are assembled to the arc channel 3 1 2 and can slide along the extending direction of the arc-shaped channel 312. Therefore, the driven gear 3 2 can be moved along the arc-shaped channel 3 1 2 by the guide of the rod 3 1 4 and can move around the driving gear 3 0 4.

9664twf1.ptc Page 14 589439 _ Case No. 91125112_ Year, Month, Day and Day Amendment _V. Description of the invention (9) Based on the above, in the gear set structure of the present invention, when the first driving gear rotates in the first direction, The driven gear can move in the first direction to make the first driven gear mesh with the driven gear. Conversely, when the second driven gear rotates in two directions, the second driven gear can move in the second direction so that The second driven gear meshes with the driven gear. In addition, when the passive gear meshes with the first driven gear, the passive gear train and the second driven gear are disengaged. Conversely, when the passive gear meshes with the second driven gear, the passive gear train and the first driven gear The moving gears are disengaged. In summary, the gear set structure of the present invention uses a low transmission gear ratio composed of a first driving gear, a first driven gear, and a driven gear with a low number of teeth to drive the scanning module to perform a scanning operation, or The high transmission gear ratio composed of the second driving gear, the second driven gear and the passive gear with multiple teeth drives the scanning module to return to the origin. In this way, the scanning module can perform scanning operations at a low speed to improve the scanning resolution, and the scanning module can perform a return to the origin operation at a high speed, thereby saving time waiting for the scanning module to return to the origin, thus reducing the user. Waiting for the next scan job, which will increase work efficiency. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes and decorations without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

9664twf1.ptc Page 15 589439 Case No. 91125112 Modified drawing Brief description Figure 1 shows a schematic diagram of the gear set structure of a preferred embodiment of the present invention; Figure 2A shows a rotation in the first direction Schematic diagram of the gear set structure. Figure 2B shows the schematic diagram of the gear set structure rotating along the second direction. Figure 3 shows the schematic diagram of the driven gear moving in a structure, especially the structure has an arc shape. The channel; and FIG. 4 is a schematic cross-sectional view of the arc-shaped channel of the structure along the A-A curve.

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Claims (1)

589439 _Case No. 91125112_Year_Month_Amendment_ VI. Scope of Patent Application 1. A gear set structure includes at least: a pivot shaft; a first driving gear is erected on the pivot shaft, and the pivot shaft can be used as the center A second driving gear is mounted on the pivot shaft and can be rotated around the pivot shaft; a first driven gear is engaged with the first driving gear, and the first driven gear can Moving around the first driving gear; a second driven gear that meshes with the second driving gear, and the second driven gear can move around the second driving gear; and a passive gear, And the first driven gear or the second driven gear, one of the two is sprayed together. 2. The gear set structure according to item 1 of the scope of patent application, wherein the pivot can be rotated in a first direction or a second direction, whichever is selected, when the pivot is rotated in the first direction, The first driven gear moves toward the first direction along the periphery of the first driving gear, so that the first driven gear meshes with the passive gear, and the second driven gear moves along the second The periphery of the driving gear moves toward the first direction, so that the second driven gear and the passive gear are in a disengaged state. When the pivot shaft rotates in the second direction, the first driven gear will follow Moving toward the second direction along the periphery of the first driving gear, so that the first driven gear and the passive gear are in a disengaged state, and the second driven gear will follow the second driving gear Around the second direction, so that the second driven gear and the 9664twf1.ptc page 17 589439 _ case number 91125112 _ month_day_iJE._ VI. Scope of patent application Passive gear meshing. 3. The gear set structure as described in item 2 of the scope of the patent application, wherein the rate of rotation of the pivot in the first direction is the same as the rate of rotation of the pivot in the second direction. 4. The gear set structure according to item 1 of the scope of patent application, wherein the number of teeth of the first driving gear is different from the number of teeth of the second driving gear. 5. The gear set structure according to item 1 of the scope of patent application, wherein the number of teeth of the first driven gear is different from the number of teeth of the second driven gear. 6. The gear set structure according to item 1 of the scope of patent application, wherein the number of teeth of the first driving roller plus the number of teeth of the first driven gear is equal to the number of teeth of the second driving roller plus the second driven Number of gear teeth. 7. The gear set structure according to item 1 of the scope of the patent application, wherein the first driven gear train is assembled on a structure having at least one arc-shaped channel with a radius of curvature of the arc-shaped channel Is equal to the radius of the first driving gear and the radius of the first driven gear, the first driven gear is fixed on a rod and can be rotated around the rod, and the rod is assembled to The arc-shaped channel can slide along the extending direction of the arc-shaped channel, and the first driven gear can be moved along the extending direction of the arc-shaped channel by the guide of the rod. 8 · The gear set structure according to item 1 of the scope of the patent application, wherein the second driven gear train is assembled on a structure having at least one arc-shaped channel with a radius of curvature of the arc-shaped channel Is equal to the sum of the radius of the second driving gear and the radius of the second driven gear. The second driven gear is fixed on a rod and can be rotated around the rod. 9664twf1.ptc Page 18 589439 _ Case No. 91125112 _ revised month and year _ 6, the scope of the patent application is assigned to the arc channel and can slide along the extension direction of the arc channel, and by the rod's The guide can move the second driven gear along the extending direction of the arc-shaped channel. 9. A gear set structure, comprising at least: a driving gear; a driven gear that meshes with the driving gear, and the driven gear can move around the driving gear; and a passive gear connected to the driven gear The gears are selectively engaged. 10. The gear set structure according to item 9 of the scope of the patent application, wherein the driving gear can rotate in a first direction and a second direction, whichever is selected, when the driving gear rotates in the first direction The driven gear moves along the periphery of the driving gear to the first direction, so that the driven gear meshes with the passive gear, and when the driving gear rotates in the second direction, the driven gear will follow Moving toward the second direction along the periphery of the driving gear, so that the driven gear and the passive gear are in a disengaged state. 1 1. The gear set structure according to item 9 of the scope of patent application, wherein the driven gear train is assembled on a structure having at least one arc-shaped channel, and the radius of curvature of the arc-shaped channel is It is equal to the radius of the driving gear and the radius of the driven gear. The driven gear train is fixed on a rod and can be rotated around the rod. The rod train is assembled into the arc channel and can Sliding along the extending direction of the arc-shaped channel, and the guide gear can move the driven gear along the extending direction of the arc-shaped channel. 1 2. —A method for driving a scanning module, which uses a tooth 9664twf1.ptc Page 19 589439 _Case No. 91125112_Amended month and year_ 6. The scope of the patent application is driven by the structure of the wheel set, which includes a pivot, a first driving gear, a second driving gear, a first A driven gear, a second driven gear, and a passive gear. The first driving gear and the second driving gear train are set on the pivot shaft. The pivot shaft can be used as a center for rotation, and the first driven gear A gear train is meshed with the first driving gear, and the first driven gear can move around the periphery of the first driving gear, the second driven gear train is meshed with the second driving gear, and the second driven gear It can move around the second driving gear, the passive gear train and the first driven gear or the second driven gear can be selected and meshed, and the scanning module is fixed on a transmission member, The passive gear can drive the transmission member, thereby driving the scanning module. The method for driving the scanning module includes at least: Step 1: driving the pivot shaft to rotate in a first direction, so that the first main shaft The gear and the second driving gear rotate in the first direction, thereby driving the first driven gear to move in the first direction along the periphery of the first driving gear, so that the first driven gear and the passive gear Meshing, at this time, the passive gear, the transmission member and the scanning module are driven to perform a scanning action, and the second driven gear train moves along the periphery of the second driving gear to the first direction, so that the The second driven gear and the passive gear are in a disengaged state; and step 2: driving the pivot shaft to rotate in a second direction, so that the first driving gear and the second driving gear rotate in the second direction , And then drive the second driven gear to move in the second direction along the periphery of the second driving gear, so that the second driven gear meshes with the passive gear, at this time, the passive gear and the transmission member will be driven And the scanning module, go back to the original 9664twf1.ptc Page 20 589439 Case No. 91125112 Amendment 6. The action of the patent application point, and the first follower moves to the second direction, so that it appears detached. 1 3. The method of patent application, wherein the number of teeth of the first driving gear. 1 4. The number of the first driving gear in the scope of patent application. 1 5. If the scope of patent application is in which the first driven gear is 〇 1 6. If the scope of patent application is in which the number of the first driven gear. 1 7. According to the scope of patent application, wherein the first active roller is equal to the second active roller method, the tooth method, the tooth number method, the tooth method, and the number coefficient. If you apply for a patent, the rate at which the polar axis rotates in the second direction is 19. If you apply for a patent, where the first gear train runs along the circumference of the first driving gear, The number of teeth on the driven scanning module according to item 12 of the first driven gear and the passive gear is less than that on the driven scanning module described in item 12 of the second driving gear. The number of teeth on the driving module of the second driving gear according to item 12 is greater than the number of teeth on the driving module of the second driving gear according to item 12 of the second driving gear is different from the second driven gear The number of teeth of the driving scan module according to item 12 plus the number of teeth of the first driven gear plus the tooth range of the second driven gear. The direction of the driving scan module according to item 12 The speed of rotation is the same as that of the scanning module driven by the pivot described in item 12 above. The first driving gear drives the scanning. 9664twf1.ptc Page 21 589439 _ Case No. 91125112_ Year Month Day Modification _ 6. The moving speed of the patent application module is lower than the moving speed of the scanning module driven by the second driving gear during step two . 2 0. A method for driving a scanning module. By selecting one of a first driving gear or a second driving gear, a passive gear and a scanning module can be driven. The method for driving the scanning module includes at least: Step 1: use the first driving gear to drive the passive gear and the scanning module to perform a scanning operation, while making the second driving gear not act on the passive gear; and step 2: using the second driving gear to drive the The passive gear and the scanning module perform an action of returning to the origin, and meanwhile, the first driving gear is not applied to the passive gear. 2 1. The method for driving a scanning module according to item 20 of the scope of patent application, wherein the number of teeth of the first driving gear is smaller than the number of teeth of the second driving gear. 2 2. The method of driving a scanning module as described in item 20 of the scope of patent application, wherein the number of teeth of the first driving gear is different from the number of teeth of the second driving gear. 2 3. The method for driving a scanning module as described in item 20 of the scope of patent application, wherein the direction in which the first driving gear drives the passive gear in step 1 is different from the second driving gear in step 2. Drive the rotation direction of the passive gear. 9664twf1.ptc Page 22