CN2519056Y

CN2519056Y - Structure of automatic adjusting tension of belt

Info

Publication number: CN2519056Y
Application number: CN 02215129
Authority: CN
Inventors: 徐文良
Original assignee: Hongguang Precision Industry Suzhou Co Ltd
Current assignee: Hongguang Precision Industry Suzhou Co Ltd
Priority date: 2002-01-14
Filing date: 2002-01-14
Publication date: 2002-10-30
Anticipated expiration: 2012-01-14

Abstract

The utility model relates to a structure of automatic adjusting tension of belt. A seat surface 111 of a scanning module is provided with a motor 13, a gear cluster 12 and an idler wheel 14, wherein, the interval between the gear cluster 12 and the idler wheel 14 is winded with a belt 15; the two ends of the belt are fixed, and at lease one end of the belt 15 is connected with a spring 152. When the strain of the belt 15 is changed, the idler wheel 14 can automatically change the mounting position, so as to indirectly change the length of the belt 15 and the spring 152, so the original strain of belt 15 before changing can automatically be reached, the scanning module can be smoothly drove, and a stable scanning quality can be gained.

Description

A kind of structure of automatic adjustment belt tension

Technical field

The utility model relates to a kind of scan module that is used to drive image-input device, relates in particular to have the structure that can adjust belt tension automatically.

Background technique

Image-input device as scanner, has the body that a plastic cement is made usually, is equiped with scan module in this body, and drives this scan module with motor and bel-drivenn mode and move back and forth, thereby reaches the purpose of scanned image.

Belt tension is to determine one of factor whether this scan module can steadily move.When the belt tension deficiency, the active force that then drives this scan module is also just not enough, and the phenomenon that speed differs and rocks can take place this scan module moving process, causes the quality of scanning of image not good.Excessive when belt tension, then driven sweep module just needs more powerful motor.

Owing to have the phenomenon of contraction behind the plastic material cooling forming, so after this body was made, its apparent size can be more smaller than intrinsic.And the two ends of belt are arranged on the body, so the tension force of this belt just can be along with the body apparent size diminishes and diminishes.In order to make this belt that enough tension force can be arranged, generally be behind this belt of assembling, on this belt, buckle a spring again, be used for improving the tension force of belt with the elastic force of this spring of nationality.

Because the deisgn approach of image-input device is short and small frivolous, the assembling space of belt also reduces relatively, though prior art can be buckled a spring to improve belt tension on this belt, but the mode of the outer button of this kind spring is except being difficult for assembling, also can need bigger assembling space, and cause needing to strengthen body dimension, obviously do not meet the trend of product specification.

Summary of the invention

Main purpose of the present utility model is to be to provide a kind of variation that utilizes member position, with the relative distance between indirect change member, thereby reaches the structure of adjusting belt tension.

The purpose of this utility model realizes with following structure.

A kind of structure of automatic adjustment belt tension includes:

One seat surface is used to be provided with gear train and motor, and this motor is used to drive this gear train;

One guide groove is opened on this seat surface and is strip;

One swing bodies, one end are provided with one and be mounted in this guide groove, and the other end is articulated on this seat surface;

One idle pulley is arranged on the axle of this swing bodies; And

One belt is around on this gear train and the idle pulley, and at least at one end is equipped with a spring this belt that is used to stretch.

So, when spring and belt tension diminish, can utilize the swing of the relative guide groove of swing bodies, change the assembling position of idle pulley, thereby change the length of belt and spring indirectly, make this belt return to original tension force.

Brief Description Of Drawings Fig. 1: be exploded view of the present utility model.Fig. 2: be constitutional diagram of the present utility model.Fig. 3: the schematic representation that is one of structure of the present utility model.Fig. 4: two the schematic representation that is structure of the present utility model.Fig. 5: be user mode figure of the present utility model.

Embodiment

The present invention is described in further detail below in conjunction with drawings and Examples.

Be exploded view of the present utility model as shown in Figure 1.Include scan module 11, one group of gear train 12, motor 13, idle pulley 14, belt 15 and swing bodies 16 among the figure.

The seat surface 111 of this scan module 11 is provided with axle 112, and this axle 112 maintains static and do not rotate.Be provided with guide groove 113 again on this seat surface 111, this guide groove 113 is strip and has crooked radian.This guide groove 113 is arranged at the position of adjacent shafts 112, and axle 112 is centre of curvature of guide groove 113.

Gear train 12 also includes first gear 121 and second gear 122, and first gear 121 and second gear, 122 overlapping being fixed together.

Swing bodies 16 also includes axle 161 and connecting rod 162, and axle 161 is arranged on an end of connecting rod 162, and axle 161 forms quadratures with respect to connecting rod 162, offers hole 163 on the other end of this external connecting rod 162 away from axle 161.

Shown in Figure 2 is constitutional diagram of the present utility model.Motor 13 is arranged on the seat surface 111, is in different bi-side respectively with axle 112.The output terminal 131 of motor 13 passes seat surface 111, and disposes a driving gear 132 on the output terminal 131.

Fig. 3, the 4th, structural representation of the present utility model.The hole 163 that connecting rod 162 1 ends of swing bodies 16 are offered among the figure is enclosed within on the axle 112, and set axle 161 just can be placed in the guide groove 113 that is arranged on the seat surface 111 on the swing bodies 16.

Gear train is located on the axle 112 for 12 groups, and first gear 121 and driving gear 132 engagements.And idle pulley is located on the axle 161 for 14 groups, and adjacent with gear train 12.

Belt 15 is set around second gear 122 and idle pulley 14, and a side that has profile of tooth 151 on the belt 15 meshes with second gear 122, and the level and smooth one side of belt 15 is then on idle pulley 14.The spring 152 that connected of belt 15 1 ends is arranged on the body (not shown) of scanner again, and the other end of belt 15 is arranged on the body of scanner equally.Set position, belt 15 two ends is just at the two ends of scan module direct of travel.

Shown in Figure 5 is user mode figure of the present utility model.Solid line is depicted as the former beginning design point of establishing among the figure, and under this state, belt 15 is around in 122 of idle pulley 14 and second gears, and an end of belt 15 cooperates spring 152 to be fixed on the body 17, and the other end of belt 15 equally also is fixed on the body 17; The belt 15 of this moment can reach the tension value of original design.

Because the body 17 of scanner is made for plastic material, and after moulding, have the phenomenon of contraction, so scanner body 17 length after the moulding can be more smaller than the length of original design, to improve the tension value of belt 15, then belt 15 just can present the tension force deficiency as if the relative position between tension value that does not improve spring 152 or change member.

Dotted portion by Fig. 5 can be observed, and when the length of body 17 was dwindled, the axle 161 of winding idle pulley 14 can move on to dotted line position by solid line position automatically along guide groove 113.Belt 15 shown in the belt 15 relative solid lines shown in the dotted line presents skewed at this moment.Because an end of spring 152 is fixed, and the length of belt 15 can obviously not prolong, and it is skewed that belt 15 is again, and the spacing between itself and body 17 1 ends can strengthen, spring 152 elongations automatically this moment, so therefore belt 15 can keep the tension value of original design.

As mentioned above, the utility model mainly is the automated location adjustment that utilizes member, changes spring 152 and belt 15 formed tension force indirectly, the tension force when not being out of shape to reach original body 17.It should be noted that amount of deformation that body 17 caused because of temperature just changes and not very big, so the angle of belt 15 wing drops is also also not very big, so, move but still scan module can be driven smoothly though belt 15 has inclination.Therefore, enforcement of the present utility model can reach motion scan module reposefully, obtains the effect of high-quality scanned image.

More than this is the utility model preferred embodiment and design, this embodiment and design only illustrate, be not to be used to limit scope of the present utility model, all with the technological means that is equal to or any distortion in the scope that claim was contained, all do not break away from interest field of the present utility model and category thereof.

Assembly and symbol description

11 scan modules, 111 seat surfaces

112 113 guide grooves

12 gear trains, 121 first gears

161 162 connecting rods of 122 second gear 13 motors, 131 output terminal 132 driving gears, 14 idle pulley 15 belts, 151 profile of tooth 152 springs, 16 swing bodiess, 163 holes, 17 bodies

Claims

1, a kind of structure of automatic adjustment belt tension is characterized in that, comprising:

One seat surface, for gear train and motor are set, described motor is used to drive described gear train;

One guide groove is opened on the described seat surface and is strip;

One swing bodies, an end of described swing bodies are provided with one and be mounted in the described guide groove, and the other end is articulated on the described seat surface:

One idle pulley is arranged on the axle of described swing bodies; And

One belt is around on described gear train and the described idle pulley, and it has at least an end to set a spring described belt that is used to stretch.

2, the structure of automatic adjustment belt tension as claimed in claim 1 is characterized in that, described swing bodies includes a connecting rod, is provided with the axle that is used to be provided with described idle pulley at an end of described connecting rod.

3, the structure of automatic adjustment belt tension as claimed in claim 1 is characterized in that, described swing bodies is arranged on the axle that is used for for described gear train is set away from an end of idle pulley.