CN1275487A - Printer - Google Patents

Abstract

A printer, wherein the positioning pin 9 of a frame 1 and the elongated positioning hole 17 of a supporting plate 15 are formed at such positions as a force F1 acts from a spring 13 to a print head 11 orthogonally to the surface thereof when the pin 9 is located at the side end part of the head fixing face 15a on the inner side face of the elongated hole 17. Since the force F1 is orthogonal to the surface of the print head 11, drag F2 of a platen 3 is parallel with the force F1. Since the contact position of the elongated hole 17 and the pin 9 is the same when printing is carried out and when a sheet is fed even if a force F4 increases through rotation of the platen 3 when a sheet is fed, noise is not generated.

Description

Printer

The present invention relates to the employed printer of printing, the draught machine of the OA machine of analytical instrument and fax etc., relate in particular to printer, the draught machine of run-in index with long thermal print head.

Here, so-called run-in index is the printer of the run-in index that is fixed of the thermal print head of the linear of saying that the mutually perpendicular direction of direction of transfer with heat sensitive paper is extended.

Fig. 1 is the printhead general configuration figure on every side of the existing printer of expression, (A) be vertical view, (B) being the cutaway view of the A-A ' position of (A), (C) is the cutaway view that the position of platen, long thermal print head, gripper shoe, slotted hole and the alignment pin of expression (B) concerns.

Platen 3 is rotatably supported by framework 1.Platen 3 is to form with for example rubber, when printing, plays the cushion pad effect, simultaneously, when paper feeding, carries heat sensitive paper.

At framework 1 rotating gripper shoe 5 is installed.Gripper shoe 5 is passed through the location slotted hole 7 and alignment pin 9 tablings that form in both ends setting longitudinally on framework 1, rotatable supported at framework 1 with can changing the position.Form slotted hole 7 in the orthogonal direction of printhead stationary plane 5a with longitudinal direction with gripper shoe 5.Form alignment pin 9 with the diameter slightly littler than the horizontal size of slotted hole 7.Printhead stationary plane 5a in gripper shoe 5 installs long thermal print head 11.

Between framework 1 and gripper shoe 5, be provided with and push printhead spring 13.Spring 13 inserts with compressed state, and gripper shoe 5 is rotated to platen 3 directions, that is, push and rely on platen 3 being installed in printhead 11 on the gripper shoe 5.

Position under the contact point of platen 3 and printhead 11, that is to say, in the plane on the surface that comprises printhead 11, form the slotted hole 7 of alignment pin 9, formation gripper shoe 5, make when the printhead stationary plane 5a of the line of the contact point of platen 3 and printhead 11 and alignment pin 9 and gripper shoe 5 is parallel, alignment pin 9 is positioned at the center (with reference to (C)) of slotted hole 7.

Apply the power of spring 13 in the mutually perpendicular direction of line, make the printhead stationary plane 5a side end of alignment pin 9 contacts towards the medial surface of slotted hole 7 with the contact point of platen 3 and printhead 11 and alignment pin 9.Therefore, the printhead stationary plane 5a of the line of the contact point of platen 3 and printhead 11 and alignment pin 9 and gripper shoe 5 not parallel (with reference to (B)).

Fig. 2 is the vertical view for the effect of representing to locate slotted hole.

In the manufacturing process of platen 3, platen 3 does not form pure drum, but as Fig. 2 (A) and (B) like that, form the coniform of butt.

When on the printer that such platen 3 is installed, if gripper shoe 5 is by at the alignment pin 9 that forms on the framework 1 and corresponding its alignment pin 9 and the circular locating hole that forms on gripper shoe 5 and supported, shown in (B), between platen 3 and printhead 11, there has been the gap, left side in the drawings, printhead 11 does not contact closely with heat sensitive paper, the typewriting of nuzzling up.Therefore, as shown in Figure 1, gripper shoe is supported on the slotted hole that the locating hole on the framework 1 forms by forming, shown in (A), the angle on the surface of corresponding platen 3, the angle of variation printhead 11, because platen 3 contacts closely with printhead, can make gradation of drop-out colour even.

Fig. 3 is the printer of presentation graphs 1, when (A) being printing, and when (B) being paper feeding, the graph of a relation of power when gripper shoe and printhead work.

(A) be when printing, apply from the power F1 of spring 13 with from the resistance F2 of platen 3 by 5 pairs of printheads 11 of gripper shoe.Because power F1 and resistance F2 are not parallel, power F3 acts on and makes on the gripper shoe 5 that printhead 11 is fixed, the position a contact location slotted hole 7 and the alignment pin 9 that come in enclosed with dashed lines.

(B) be when paper feeding, the rotation by platen 3 applies power F4.By power F4, gripper shoe 5 is moved toward the rightabout of power F3, locatees slotted hole 7 and alignment pin 9 in the position b contact that enclosed with dashed lines is come.

Like this, when printing and during paper feeding, contact location slotted hole 7 is different with the position of alignment pin 9.Therefore, when printer is worked, print repeatedly and paper feeding, gripper shoe 5 vibrations are for example printed and during paper feeding the noise of generation 100Hz repeatedly every 10 milliseconds.

Therefore, the objective of the invention is when printing and during paper feeding, in the contact position that changes slotted hole and pin, do not produce noise.

Printer of the present invention, it is surface at the fixing long thermal print head of the supported plate of subtend, configuration is along the platen of the longitudinal extension of thermal print head, be provided with to platen one side in the rear side of described gripper shoe and push thermal print head, make it rely on the spring of pushing direction, rely on the slotted hole tabling of the direction extension of described spring by pin and edge at the described both ends longitudinally of described gripper shoe, to the rotatable printer that can change the supported run-in index in ground, position of body frame, it is characterized in that:

The contact position of described pin and described slotted hole is defined as, and when printing and during paper feeding, the contact position of described pin and described slotted hole is identical.

The contact position of described pin and described slotted hole is, described pin be located at platen and printhead contact point under the position, the slotted hole that forms described gripper shoe makes when the printhead stationary plane of the line of the contact point of platen and printhead and described pin and gripper shoe is parallel, and described pin is located at the side end position of printhead stationary plane of the internal face of slotted hole.

Make the contact position of pin and slotted hole identical when printing owing to determine the pin and the position of slotted hole, when printing and paper feeding repeatedly, do not change the contact position of slotted hole and pin, therefore, can suppress to follow the contact position of change slotted hole and pin and the noise that produces with paper feeding.

Briefly explain accompanying drawing and symbol below.

Fig. 1 is the printhead general configuration figure on every side of the existing printer of expression, (A) be vertical view, (B) being the cutaway view of the A-A ' position of (A), (C) is the cutaway view that the position of platen, long thermal print head, gripper shoe, slotted hole and the alignment pin of expression (B) concerns.

Fig. 2 is the vertical view for the effect of representing to locate slotted hole.

Fig. 3 is the printer of presentation graphs 1, when (A) being printing, and when (B) being paper feeding, the graph of a relation of power when gripper shoe and printhead work.

Fig. 4 is the printhead general configuration figure on every side of expression embodiment 1, (A) is vertical view, (B) is the cutaway view of the A-A ' position of (A).

Wherein, 1---framework; 3---platen; 9---alignment pin; 11---the run-in index thermal printing head; 13---push the printhead spring; 15---gripper shoe; 15a---printhead stationary plane; 17---the location slotted hole.

Embodiment

Fig. 4 is the printhead general configuration figure on every side of expression embodiment 1, (A) is vertical view, (B) is the cutaway view of the A-A ' position of (A).The part identical with Fig. 1 is with same symbolic representation, its explanation of Therefore, omited.

Rotatable platen 3 and gripper shoe 15 are installed on framework 1, run-in index thermal printing head 11 is installed on the printhead stationary plane 15a of gripper shoe 15, between framework 1 and gripper shoe 15, be provided with and push printhead spring 13.Gripper shoe 15 is passed through the location slotted hole 17 and alignment pin 9 tablings that form in both ends setting longitudinally on framework 1, rotatable supported at framework 1 with can changing the position.

Position under the contact point of platen 3 and printhead 11, that is to say, in the plane on the surface that comprises printhead 11, form alignment pin 9, when the printhead stationary plane 15a of the line of the contact point of platen 3 and printhead 11 and alignment pin 9 and gripper shoe 15 was parallel, side end (being the position of slotted hole 17 left ends among the figure) position of printhead stationary plane 15a that alignment pin 9 is located at the internal face of slotted hole 17 formed the slotted hole 17 (with reference to (B)) of gripper shoe 15.

Act on the power F1 of printhead 11 from spring 13, vertical mutually with the printhead stationary plane 15a of gripper shoe 15, also vertical mutually with the face of the printhead 11 of platen 3 contacted sides.At this moment, to printhead 11, parallel with power F1 from the resistance F2 of platen 3.Therefore, do not produce Fig. 3 shown in such power F3, when paper feeding, even because the rotation of platen 3 has increased power F4, when printing and during paper feeding, slotted hole 17 is identical with the contact position of alignment pin 9, does not produce noise.

In this embodiment, push with spring action in the power F1 of printhead 11 from printhead, vertical mutually like that with the face of the printhead that contacts platen 3 one sides, the location slotted hole is set on gripper shoe, alignment pin is set on framework, but the present invention is not limited only to this, also can alignment pin be set on gripper shoe, and the location slotted hole is set on framework.

And, also can form location slotted hole and alignment pin to the such position of platen lopsidedness on the surface of printhead.In the case, printhead and gripper shoe are by the incline direction power generation effect of spring to printhead, because this power is by the rotation of platen, work with the active force equidirectional that acts on printhead and gripper shoe, in the slotted hole of location, alignment pin can not rock.

The printer of run-in index of the present invention, because when printing and during paper feeding, the contact position of alignment pin and slotted hole is identical, even print repeatedly and paper feeding, the contact position of pin and slotted hole does not change, and can suppress generating noise.

Claims (2)

1. printer, it is surface at the fixing long thermal print head of the supported plate of subtend, configuration is along the platen of the longitudinal extension of thermal print head, be provided with to platen one side in the rear side of described gripper shoe and push thermal print head, make it rely on the spring of pushing direction, described both ends longitudinally in described gripper shoe, rely on the slotted hole tabling of the direction extension of described spring by pin and edge, to the rotatable printer that can change the supported run-in index in ground, position of body frame, it is characterized in that:

The contact position of described pin and described slotted hole is defined as, and when printing and during paper feeding, the contact position of described pin and described slotted hole is identical.

2. printer, it is surface at the fixing long thermal print head of the supported plate of subtend, configuration is along the platen of the longitudinal extension of thermal print head, be provided with to platen one side in the rear side of described gripper shoe and push thermal print head, make it rely on the spring of pushing direction, described both ends longitudinally in described gripper shoe, rely on the slotted hole tabling of the direction extension of described spring by pin and edge, to the rotatable printer that can change the supported run-in index in ground, position of body frame, it is characterized in that:

The contact position of described pin and described slotted hole is, described pin be located at platen and printhead contact point under the position, the slotted hole that forms described gripper shoe makes when the printhead stationary plane of the line of the contact point of platen and printhead and described pin and gripper shoe is parallel, and described pin is located at the side end position of printhead stationary plane of the internal face of slotted hole.

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