CN1948017A

CN1948017A - Photographic printing machine having translational cam mechanism for driving paper-pressing drum vertically lifting/lowering

Info

Publication number: CN1948017A
Application number: CN 200510108626
Authority: CN
Inventors: 何慧君
Original assignee: Lite On Technology Corp
Current assignee: Lite On Technology Corp
Priority date: 2005-10-10
Filing date: 2005-10-10
Publication date: 2007-04-18
Anticipated expiration: 2025-10-10
Also published as: CN100526085C

Abstract

A copy printer with a translational cam mechanism for driving the paper pressing drum to lift vertically is disclosed. A horizontally sliding translational cam has concave surface and convex surface on its profile to control the stroke of driven part. When said cam is sliding on a track, the roller on the drum supporter is rolling on the profile of cam to make the drum supporter and in turn the drum to move vertically, so close to or far from the printing head.

Description

Copying machines with translation cam mechanism of driving paper-pressing drum vertically lifting

Technical field

The present invention relates to a kind of copying machines, especially relate to a kind of copying machines with translation cam mechanism of driving paper-pressing drum vertically lifting.

Background technology

The general platen that heat sublimation/hot transfer printing copying machines (Thermal Printer) has heat sublimation/thermal printing head and is used for carrying print media.Usually when copying machines does not print, platen separates with printhead, when copying machines is printed, printhead needs to have contacting of sufficient force with platen, can be fixed by enough power when making print media enter between printhead and platen, and guarantee that printhead contacts print media in transfer process.

The approaching mechanism of the printhead of heat sublimation in the prior art/hot transfer printing copying machines and platen roughly is divided into two classes.Described in " heat transfer write copying machines " that the first kind such as day disclosure special permission communique P2003145819A are disclosed, it is by the platen support that supports platen, and platen is driven and the proximity printing head with curved path.Second class is the printing head support part by printhead support, printhead is driven with curved path and near platen.

Wherein the first kind is driven platen by the platen support and comes fewly with the required part number of the mode of proximity printing head than second class with curved path, and is applicable to the heat sublimation copying machines (as the photograph copying machines of exportable 2 inches photographs) of small-sized volume.Yet no matter be that platen is driven with the proximity printing head by the platen support, or printhead is printed head bracket and drives with near platen, all be to drive approaching with curved path, therefore need the movable space of a rocking arm (being platen support or printing head support part) at least, and this space can only can not allow that other part exists therebetween as the space of rocking arm activity.In addition, no matter be platen support or printing head support part, utilize the work of moment in order to drive platen or printhead because be, its required rigidity makes the material of support must use more strong metalwork, in production cost and the energy consumption in order to driving arm improvable space is arranged all.

Summary of the invention

Therefore, main purpose of the present invention is to provide a kind of copying machines (photo printer) with translation cam mechanism of driving paper-pressing drum vertically lifting, to address the above problem.

The invention provides a kind of copying machines with translation cam mechanism of driving paper-pressing drum vertically lifting, it includes a housing, which is provided with a track; One translation cam has a plurality of concave surfaces, installing in orbit along the mode that track cross level moves; One rolling stand group is placed on the translation cam, is used for when translation cam slides, and moves up and down along the gabarit of translation cam; One platen is fixed on the rolling stand group in rotating mode; And a printhead, be arranged at a side of platen, be used for the print media that moves between printhead and the platen is printed.

For making above and other objects of the present invention, feature and advantage can should be readily appreciated that more obviously that below especially exemplified by preferred embodiment, and conjunction with figs. is elaborated.

Description of drawings

Fig. 1 is the schematic diagram of copying machines with mechanism of driving paper-pressing drum vertically lifting;

Fig. 2 is the not schematic diagram of print state of platen;

Fig. 3 prints the schematic diagram that carries out state for platen;

Fig. 4 is the schematic diagram of translation cam displacement and platen displacement relation.

The specific embodiment

With reference to Fig. 1.Fig. 1 can drive the schematic diagram of the copying machines 100 of platen 150 vertical lift translation cam mechanisms for the present invention has.Copying machines 100 includes a housing 110, which is provided with a track 120, a translation cam 130, has a plurality of concave surfaces 135, a rolling stand group 140, a platen 150, a printhead 160 and elastic device 170,180 on it.Rolling stand group 140 comprises two pin supports 144, and each pin support 144 includes an axis hole 142 and a roller 145.

Translation cam 130 is being installed in along the mode that track 120 moves horizontally on the

track

120, and 140 of rolling stand groups are placed on the translation cam 130.Platen 150 is fixed on the rolling stand group 140 in rotating mode, wherein the axis hole 142 of each pin support 144 of rolling stand group 140 is used for installing platen 150, and platen 150 can be rotated in the axle center of rolling stand group 140 upper edge platens 150.Printhead 160 is arranged at a side of platen 150, is used for the print media that moves between printhead 160 and the platen 150 is printed.

With reference to Fig. 2 and Fig. 3.Fig. 2 and Fig. 3 are for driving the action schematic diagram of the mechanism of platen 150 vertical lift translation cams in the copying machines 100 of the present invention.Fig. 2 is the not schematic diagram of print state of platen 150, and Fig. 3 prints the schematic diagram that carries out state for platen 150.In Fig. 2, the roller 145 of pin support 144 is arranged in the concave surface 135 of translation cam 130, therefore the rolling stand group of being made up of two pin supports 144 140 is to be positioned at lower position in Fig. 2, and the platen 150 that is fixed on the rolling stand group 140 also is in lower position.Because translation cam 130 can move horizontally on track 120, therefore working as translation cam 130 is promoted by the transmission mechanism in the copying machines 100 (indicating on the figure), and on the track 120 when direction F slides, roller 145 will roll along the gabarit of translation cam 130.Because roller 145 is to roll along the ascending curve of translation cam 130 upper limb concave surfaces 135, so rolling stand group 140 will promote move to direction N by the gabarit of translation cam 130, vertically move so drive platen 150.

The design of the shaped form of translation cam 130 gabarit concave surfaces 135 can make translation cam 130 only need move by a small margin distance, rolling stand group 140 and platen 150 upwards can be promoted required height.As shown in Figure 3, when translation cam 130 after direction F moves by a small margin distance, rolling stand group 140 and the platen 150 that is fixed thereon be promptly along with roller 135 is promoted by translation cam 130 gabarits, and rise to the height that can contact with printhead 160 toward direction N.

Copying machines 100 of the present invention is provided with elastic device 170 between side of translation cam 130 and housing 110, when translation cam 130 promoted by transmission mechanism and on the track 120 when direction F slides, elastic device 170 is pushed by translation cam 130 and is compressive state, and elastic device 170 will offer translation cam 130 1 answer thrusts this moment.In addition, copying machines 100 of the present invention is sold between supports 144 and the housing 110 in two of rolling stand group 140 and also is provided with two elastic devices 180, when rolling stand group 140 be fixed on platen 150 on the rolling stand group 140 when rising, elastic device 180 also is compressive state by 144 extruding of two pin supports, and elastic device 180 will offer rolling stand group 140 1 answer thrusts this moment.Because rolling stand group 140 is placed on the translation cam 130, elastic device 180 of the present invention also can at any time provide a thrust to push rolling support group 140 to translation cam 130, this thrust can make rolling stand group 140 in the rolling process, guarantee the gabarit of rolling stand group 140 contact translation cams 130 on translation cam 130.Because the effect of transmission mechanism, elastic device 170 is maintained in the compressive state in the state of Fig. 3, and translation cam 130 also is maintained at the fixed position simultaneously.Wherein elastic device 170,180 can be a spring.

After copying machines 100 printing actions were finished, transmission mechanism stopped the thrust to F to translation cam 130 providers, and this moment, elastic device 170 was with translation cam 130 (rightabout of F) promotion to the right owing to the answer thrust of elastic device 170.When translation cam 130 is promoted by elastic device 170 and slides to the right on track 120, the roller 145 of rolling stand group 140 rolls along concave surface 135 at this moment, also owing to be connected in the effect of answer thrust of the elastic device 180 of rolling stand group 140, when roller 145 rolls, elastic device 180 can promote rolling stand group 140 downwards, the platen 150 that is fixed on rolling stand group 140 also is pushed down, gets back to location status as shown in Figure 2 at last.

With reference to Fig. 4, Fig. 4 is the schematic diagram of translation cam 130 displacements and platen 150 displacement relations.When translation cam 130 was promoted to produce horizontal displacement by transmission mechanism, the position of translation cam 130 horizontal displacements will be through A, B, C, D four-stage.Wherein to be roller 145 move to the process of the print states that platen 150 and printhead 160 tentatively contact by the position of the not print state of Fig. 2 (be platen 150 separate with printhead 160 state) the A stage.The B stage is platen 150 and the 160 preliminary stages that contact of printhead.The gabarit of the translation cam 130 of copying machines 100 of the present invention also has a upward stroke, therefore when translation cam 130 continues to slide, translation cam 130 will be through the C stage, this moment, roller 145 was promoted by a projection on the translation cam 130, roller 145 is more upwards raised, and rolling stand group 140 and platen 150 are also upwards raised, and platen 150 and printhead 160 were had than the B stage contact more closely.Because general platen 150 is rubber-like elastomeric materials slightly, therefore can allow the effect in this projection of C in the stage.Last translation cam 130 continues to slide into the position in D stage, and platen 150 also drops to the height that normally contacts as B stage and printhead 160 thereupon.And should projection also can after roller 145 break away from the concave surface 135 of translation cam 130, limit roller 145 and roll.

In addition, track 120 of the present invention is to be fixed on the housing 110 in the mode that an end can be adjusted horizontal level, therefore can in assembling process, finely tune the horizontal level of track 120 easily, consistent with the platen of guaranteeing to be arranged on the track 120 150 with the contact wire between the printhead 160, and cause required contact stress.

Has a mechanism that can drive platen 150 vertical lifts by above-mentioned, copying machines 100 provided by the invention has still less part and simpler assembling than prior art, because the curve characteristic of concave surface makes that the required driving force of driving platen lifting is also little than prior art.And the vertical platen elevating mechanism that moves than prior art that utilizes translation cam to move horizontally and drive platen of the present invention uses littler space, therefore can further reduce the volume of copying machines.

The above only is the preferred embodiments of the present invention, and all equivalent variations and modifications of being made according to claim scope of the present invention all should belong to protection scope of the present invention.

Claims

1. copying machines with translation cam mechanism of driving paper-pressing drum vertically lifting includes:

One housing which is provided with a track;

One translation cam has a plurality of concave surfaces, can be installed on the described track along the mode that described track cross level moves;

One rolling stand group is arranged on the described translation cam, is used for when described translation cam slides, and moves up and down along the gabarit of described translation cam;

One platen is fixed on the described rolling stand group in rotating mode; And

One printhead is arranged on a side of described platen, is used for the print media that moves between described printhead and the described platen is printed.

2. copying machines as claimed in claim 1, wherein said rolling stand group includes a plurality of rollers, is used for when translation cam slides, and rolls along the upper limb of translation cam, does and moving both vertically to drive platen.

3. copying machines as claimed in claim 1, wherein said rolling stand group comprise two pin supports, and each pin support includes:

One axis hole is used for installing platen, and platen can be rotated in the axle center of rolling stand group upper edge platen; And

One roller is used for rolling along the gabarit of translation cam.

4. copying machines as claimed in claim 3, the gabarit of wherein said translation cam also has a convex surface, is used for after roller breaks away from a concave surface of translation cam, and the restriction roller rolls.

5. copying machines as claimed in claim 1 wherein also comprises an elastic device, is connected between the side and housing of translation cam, is used to provide to translation cam one and replys thrust.

6. copying machines as claimed in claim 5, wherein said elastic device are a spring.

7. copying machines as claimed in claim 1 wherein also comprises a plurality of elastic devices, is connected between rolling stand group and the housing, is used to provide to rolling stand group one and replys thrust.

8. copying machines as claimed in claim 7, wherein said a plurality of elastic devices are a plurality of springs.

9. copying machines as claimed in claim 1, the mode that wherein said track can be adjusted horizontal level with an end is fixed on the housing.

10. copying machines as claimed in claim 1, wherein said a plurality of concave surfaces are shaped form.