Printer and blade withdrawal mechanism thereof

A printer and its blade withdrawal mechanism, comprising: a fixing board, used for fixing a down cutter, the lower end of the fixing board can be pivotally installed on an installing support; a balance unit; a locking unit; and a manipulation unit, which is installed on the installing support, located at one side of the combination of the fixing board and the down-cut blade, and can move downward by two segment travels under the effect of external force, at the first segment travel, it can act on the balance unit, while at the second segment travel, it can act on the locking unit. The invention can simplify the handling of the faults such as paper jam, and improve the handling efficiency.

CROSS-REFERENCE TO RELATED APPLICATION

This Application is a Section 371 National Stage Application of International Application No. PCT/CN2012/073269, filed Mar. 29, 2012 and published as WO 2013/040882 on Mar. 28, 2013, not in English, the contents of which are hereby incorporated by reference in their entirety.

TECHNICAL FIELD

The invention relates to a printer, especially blade withdrawal mechanism of the printer.

BACKGROUND ART

The printers of the prior art are generally installed with automatic cutting paper device, which generally consists of the mutually cooperated top-cut blade part and down cut-blade blade part, thereof, the top cut-cut blade part further comprises the top-cut blade which can move up and down, and the drive unit comprising motor, worm and cam mechanism. While the down-cut blade part comprises the fixed installed down-cut blade, paper cutting unit and installing support, where both the down-cut blade and the paper cutting unit are installed on the installing support. The installing support itself can be pivotally installed on the mainframe of the printer. Under normal operation condition, when paper is required to be cut after being printed, program operated in the controller of the printer will send instruction to the drive unit of the top-cut blade part, enabling the top-cut blade to move downward to the setting position where paper can be cut off, then return to the home position automatically. If for some reason, for example: paper is stuck between the top-cut blade and the down-cut blade, enabling the top-cut blade fails to return automatically, then the top-cut blade will be partially blocked at the outside of the down-cut blade, enabling the maintenance personnel fails to directly open the down-cut blade part. On the other hand, for protection need, under the circumstance that the top-cut blade fails to return to the home position due to being jammed, after the passing of the set homing time or in the case of detecting abnormal motor operation, the controller will cut off power source of the motor, so as to avoid motor burnout. At this time, blade withdrawal mechanism is needed, and manual intervention is required, so as to shoot the trouble. For the blade withdrawal mechanism of the prior art, it is just the setting of a window simply at the top-cut blade part to enable the worm to expose partially, thus maintenance personnel can poke the worm manually, drive the top-cut blade to return to the home position artificially, and clear paper and conduct other maintenance work by opening the down-cut blade part after the return of the top-cut blade. However, such structure wastes time and energy at handling troubles such as paper jam, and the efficiency is low. Therefore, it is indeed necessary to improve the prior art.

CONTENT OF THE INVENTION

The invention is intended to solve the technical issues by means of avoiding the deficiencies of the above the prior art, and put forward a printer and its blade withdrawal mechanism, which can simplify the handling of faults such as paper jam and improve the handling efficiency.

Technical proposal adopted by the invention for solving the above technical issues includes putting forward a blade withdrawal mechanism of a printer, comprising:

a fixing board, used for fixing a down-cut blade, the lower end of the fixing board can be pivotally installed on an installing support, and lower end of the installing support can be pivotally installed on a main body;

a balance unit, installed on the installing support, and acts on the combination of the fixing board and the down-cut blade from front and rear, so as to enable the combination to be at the non-pivotal normal state, or at the blade withdrawal state of pivotally rotating to the rear by a certain angle;

a locking unit, used for enabling the installing support to be at a locking state of being connected to the main body non-pivotally, or at an open state of pivotally rotating to the front by certain angle forward; and

a manipulation unit, installed on the installing support and located at one side of the combination of the fixing board and the down-cut blade, can move downward by two segment travels under the effect of an external force, at the first segment travel, it can act on the balance unit, so as to enable the combination of the fixing board and the down-cut blade to convert from the normal state to the blade withdrawal state, while at the second segment travel, it can act on the locking unit, so as to enable the installing support to convert from locking state to open state.

The manipulation unit comprises a position induction switch which is located at the border between the first segment travel and the second segment travel.

The manipulation unit comprises a main part which can move downward under the effect of external force, and a flexible assembly which can enable the main part to maintain/return to top position; the main part is set with a handle, a first matching part for cooperating the balance unit, and a second matching part for cooperating the locking unit.

The first matching part of the manipulation unit comprises a vertically extended chute which is set at the upside of the main part, and a first stop dog. The second matching part comprises a second stop dog which is set under the first stop dog.

The balance unit comprises a camshaft which is set in the rear resisting against the combination of the fixing board and the down-cut blade, and a cam which is installed at the end of the camshaft. The cam is provided with a pivoting head, and the balance unit cooperates with the manipulation unit through the cam.

The balance unit also comprises a flexible assembly which is set in the front for resisting and pushing backward the combination of the fixing board and the down-cut blade.

The balance unit further comprises a stop block which is set at the rear of the combination of the fixing board and the down-cut blade, for limiting the rotation angle of the camshaft.

The camshaft is a cylinder with smooth cutting face, and the cutting face of the camshaft is perpendicular to the combination of the fixing board and the down-cut blade when the latter is at normal state.

The locking unit comprises a slip sheet which is installed on the installing support and can move downward under the effect of external force, a flexible assembly which can enable the slip sheet to maintain/return to the top position, and a stop dog which is installed on the main body and cooperates with the slip sheet. The slip sheet is provided with a chute and a bonding jumper, and the locking unit cooperates with the manipulation unit through the slip sheet and the bonding jumper.

Technical proposal adopted by the invention for solving the above technical issues further includes putting forward a printer, comprising the aforementioned blade withdrawal mechanism.

Compared with the prior art, by setting mutually cooperated balance unit, locking unit and manipulation unit of two segment travels, printer of the invention and its blade withdrawal mechanism can successively complete the action of getting rid of the jamming between the top-cut blade and down-cut blade and the action of opening the down-cut blade part automatically in one go without interruption, which can greatly simplify the handling of faults such as paper jam, and improve the processing efficiency.

MODE OF CARRYING OUT THE INVENTION MODEL

To further illustrate the principle and structure of the invention, the invention is further described in detail in accordance with the preferable embodiments shown in the figures.

The top-cut blade part3comprises the top-cut blade31and the drive unit32. SeeFIG. 5, the drive unit is composed of motor321, dial wheel322, worm323and cam mechanism324. The dial wheel322is connected with the worm323as a whole, worm323can be driven by the dial wheel322while the latter is poked artificially, thus enabling the cam mechanism324to drive the top-cut blade31installed thereupon to move up and down.

The down-cut blade part4comprises the down-cut blade41, the paper cutting unit2, the installing support44and the blade withdrawal mechanism. In the embodiment, the installing support44is the plate sealing component. The blade withdrawal mechanism comprises:

A fixing board42, used for fixing a down-cut blade41, the lower end of the fixing board42is set with pivot421which can be pivotally installed on the installing support44, while the lower end of the installing support44can be pivotally installed on the main body1.

A balance unit43, which is installed on the installing support44and acts on the combination of the fixing board42and the down-cut blade41from front and rear, so as to enable the combination to be at non-pivotal normal state, or blade withdrawal state of pivotally rotating to the rear by certain angle. It comprises: a camshaft431, which is a cylinder with smooth cutting face, seeFIG. 5, set at the rear of the combination of the fixing board42and the down-cut blade41for resisting the combination, included angle a between the cutting face of the camshaft431and the combination of the fixing board42and the down-cut blade41when the combination is at normal state is 90°; a cam46which is installed at the end of the camshaft431and provided with a pivoting head461; flexible assembly432which is set at the front of the fixing board42and the down-cut blade41, for resisting and pushing backward the combination of the fixing board42and the down-cut blade41, in the embodiment, the flexible assembly432can be two compressed springs, while in the other embodiment, the flexible assembly432can also be several tension springs set at the rear of the fixing board42and the down-cut blade41for connection and pulling back the combination of the fixing board42and the down-cut blade41; a stop block21, which is set at the rear of the combination of the fixing board42and the down-cut blade41, for limiting the rotation angle of the camshaft431, and in the embodiment, limiting of the stop block21is achieved through the paper cutting board in the paper cutting unit2.

A locking unit, which is for enabling the installing support44to be at the locking state of connecting with the main body1non-pivotally or at the open state of pivoting forward by certain angle, and it comprises a slip sheet47which is installed on the installing support44and can move downward under the action of external force, a flexible assembly49which can enable the slip sheet47to maintain/return to the top position and a stop dog11which is installed on the main body1and cooperates with the slip sheet47, and the slip sheet47is set with a chute474and a bonding jumper472; and

A manipulation unit, which is installed on the installing support44, located at one side of the combination of the fixing board42and the down-cut blade41, and move downward by two segment travels under the action of external force. SeeFIG. 4toFIG. 8, at the segment travel, it can act on the balance unit, so as to enable the combination of the fixing board42and the down-cut blade41to convert from normal state to blade withdrawal state; seeFIG. 9toFIG. 12, at the second segment travel, it can act on the locking unit, so as to enable the installing support44to convert from locking state to open state. It comprises a position induction switch (has not been shown by Figure) which is set between the border of the first segment travel and second segment travel, the position induction switch can inform the processor in the printer, enabling the processor to control the operation of the motor321of the top cutter part3, so as to enable the top-cut blade31to return to the home position automatically, generally, time spent by the return process is within 1 Second, which is extremely rapid. The manipulation unit comprises a main part45which can move downward under the action of external force and a flexible assembly48which can enable the main body to maintain/return to the top position; the main part45is set with a handle451, a first matching part for cooperating the balancing unit, and a second matching part for cooperating the locking unit. The first matching part comprises a vertically extended chute452which is set at the upside of the main part45and a first stop dog454, pivoting head461of the cam46is resisted below the first stop dog454, so as to enable the cam46to move in the chute452and drive the camshaft431to rotate; the second matching part comprises a second stop dog453which is set below the first stop dog454, the second stop dog453can connect against the bonding jumper472on the slip sheet47, while the slip sheet47to move downward during the second segment travel, till the upper end471of the slip sheet47will be no longer limited by the stop dog11.

Operating principle of the printer and its blade withdrawing mechanism of the invention roughly comprises: when the printer is at normal state, action of the tension spring48of the handle451is at the highest point, action of the tension spring49of the slip sheet47is at the highest point, cam46is at the highest point, contact angle between the cutting face of the camshaft431and the fixing board42a is 90°, and the spring432imposes backward force to the fixing board42and the down-cut blade41.

When during paper cutting process, the top-cut blade31of the printer fails to return due to the friction effect of paper, namely paper jam, to avoid motor burnout, motor321stops running, and corresponding detection switch will inform the processor to cut off the motor power source after a certain time, so as to enable the motor to stop working. At this time, maintenance personnel can press downward the handle451, during the first segment travel downward, the handle451will drive the cam46, the cam46will drive the camshaft to431rotate by certain angle, and under the action of the spring432, fixing board42and down-cut blade41will also rotate by a corresponding angle, at this time, seeFIG. 7andFIG. 8, contact angle a between the cutting face of the camshaft431and the fixing board42is 150°, the top-cut blade31and down-cut blade41will maintain certain distance from front and rear, the position induction switch will inform the process to control the motor321to return to work, the motor321will drive the worm323to rotate, the worm323will drive the cam mechanism324to move, so as to drive the top cutter31to return to the home position, meanwhile, rear of the down-cut blade41will be blocked by the stop block21, limited by the stop dog11, upside471of the slip sheet47will enable the down-cut blade part4fails to open. Then, maintenance personnel can continue to press down the handle451, during the second segment travel traveled by the handle451, the second stop dog453and the bonding jumper472on the slip sheet47connect and cooperate against each other, which can drive the slip sheet47to move downward, meanwhile, camshaft431can continue to move, seeFIG. 10, nevertheless, because rear of the down-cut blade41is blocked by the stop block21, the down-cut blade41will not continue to rotate, till the completion of the second stroke, at this time, stop block11fails to block the upper end471of the slip sheet47, down-cut blade part4can open outward, so as to conduct maintenance work such as removing paper scrap, till the completion of clearing, then enable the down-cut blade part4to return to the locking state, and the printer can be put into operation again.

In case of damage of the position induction switch, motor321, or drive circuit of the motor321, giving rise to the completion of the above first segment travel, failure of self-return of the top-cut blade31, maintenance personnel shall manually enable the top-cut blade31to return relying on the dial wheel322, then press down the handle451to complete the second segment travel, so as to implement corresponding maintenance work.

The above embodiment is only the preferred embodiment of the invention, aiming to further explain the invention, rather than limiting. Simple replacements in accordance with the content disclosed by the above test and attached drawings are within the scope of protection of the patent right.