JPH05221055A - Printer - Google Patents

Abstract

PURPOSE:To make paper jam treatment in a platen part easy by a method wherein a means which separates a pinch roller from a platen roller in linkage to opening operation of a cover is provided between a pinch roller supporter and the cover. CONSTITUTION:An arm pin 26a is fitted to an arm 26, and a notch part 22b of a cover 22 comes to abut against the arm pin when the cover 22 is opened. A thermal head 2 is attached to a tip of the arm 26. When a knob 23 is drawn in the direction of arrow A, a cover hook 24 is separated from a cover locking pin 22a. Locking for the cover 22 is released thereby, and the cover can be opened by making the cover turn. Since the notch part 22b abuts against the arm pin 26a at that time, the arm 26 turns together with the cover 22, and the thermal head 2 is largely separated from a platen roller 1. Consequently, paper jam treatment in a platen part can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer having a pinch roller which comes into contact with and separates from a platen roller.

[0002]

2. Description of the Related Art FIG.
FIG. 8 is a configuration diagram showing a main part of a conventional thermal printer disclosed in Japanese Patent Publication No. JP-A-2003-12065, and FIG. 8 is a bottom view of the thermal printer shown in FIG. In the figure, 1 is a platen roller, 2 is a thermal head that is in contact with and separated from the platen roller 1, 3 is an ink sheet that is conveyed between the platen roller 1 and the thermal head 2, and 4 is a sheet wound around the platen roller 1 and supplied. It is the paper that is used.

Reference numerals 5 and 6 denote support members provided above both ends of the platen roller 1 in the axial direction, 6 denotes a paper feed pinch roller holder rotatably attached to each support member 5, and 7 denotes the platen roller 1. A plurality of paper discharge pinch roller pressers 8 are rotatably attached to the respective support members 5 so as to face the paper feed pinch roller pressers 6 with 8 interposed therebetween. The paper feed pinch rollers 9 are a plurality of paper discharge pinch rollers provided between the paper discharge pinch roller holders 7. The pinch rollers 8 and 9 are rotated by the platen roller holders 6 and 7, respectively. Move to and away from 1.

Numeral 10 is a tension spring which is provided between the front end portions of the paper feed pinch roller presser 6 and the paper discharge pinch roller presser 7 and presses the respective pinch rollers 8 and 9 against the platen roller 1.
Reference numeral 11 denotes a rotary plate which is rotatably provided between the paper feed pinch roller presser 6 and the paper discharge pinch roller presser 7, and which opens and closes each pinch roller presser 6, 7, and 12 a rotary shaft 13 of the rotary plate 11.
Is a release lever that is connected to the rotating plate 11 and rotates the rotating plate 11.

Next, the operation will be described. As shown in FIG. 9, the pinch rollers 8 and 9 are pressed against the platen roller 1 by a tension spring 10, and the sheet 4 is conveyed along the platen roller 1 in this state.

When a paper jam occurs in the platen roller 1, the printer cover (not shown) is first used.
Open and open the thermal head 2 to the platen roller 1
To separate from. Then, the release lever 12 is manually pushed in the direction of the arrow in FIG. As a result, as shown in FIG. 10, the rotary plate 11 rotates integrally with the rotary shaft 13, and the pinch roller retainers 6 and 7 rotate in the directions in which they are separated from each other against the tension spring 10. As a result, the pinch rollers 8 and 9 are separated from the platen roller 1 and the jammed paper 3
Are removed.

[0007]

In the conventional thermal printer configured as described above, it is necessary to manually operate the release lever 12 in order to separate the pinch rollers 8 and 9 from the platen roller 1. Therefore, there is a problem that opening and closing of the pinch rollers 8 and 9 is troublesome, and it takes time to clear the paper jam.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a printer capable of facilitating paper jam processing at the platen portion.

[0009]

In the printer according to the present invention, a pinch roller separating means for separating the pinch roller from the platen roller in association with the opening operation of the cover is provided between the support member of the pinch roller and the cover. It was installed in.

[0010]

In the present invention, the opening operation of the cover is transmitted to the support member of the pinch roller by the pinch roller opening means, and the pinch roller is automatically separated from the platen roller.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a thermal printer according to an embodiment of the present invention. The same or corresponding parts as in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted. In the figure, 21 is a main body case, 22 is a cover (top cover) which is attached to the main body case 21 so as to be rotatable and openable, 23 is a knob provided on the main body case 21 side so as to be slidable in the direction of arrow A, Is a cover hook engaged with the cover lock pin 22a of the cover 22.

Reference numeral 25 is a head support shaft provided in the main body case 21, and 26 is an arm attached to the head support shaft 25. The thermal head 2 is attached to the tip of the arm 26.
Is attached. An arm pin 26a is attached to the arm 26 so that the cover can be opened when the cover 22 is opened.
The notch 22b of 22 abuts. Reference numeral 27 denotes a connecting bar which is provided in the main body case 21 and slides by operating the knob 23, and 28 denotes a pinch roller which comes in contact with and separates from the platen roller 1.

Next, the operation of opening the cover 22 will be described. In FIG. 1, when the knob 23 is pulled in the direction of arrow A, the cover hook 24 is disengaged from the cover lock pin 22a. As a result, the lock of the cover 22 is released, and the cover 22 can be opened by rotating it in the direction of arrow B as shown in FIG. At this time, since the notch 22b contacts the arm pin 26a, the arm 26 rotates together with the cover 22 and the thermal head 2 is largely separated from the platen roller 1.

Next, FIG. 3 shows head up (retraction) of the up / down (U / D) mechanism of the thermal head 2 of FIG.
FIG. 4 is a configuration diagram showing the state, and FIG.
It is a block diagram which shows a state. In the figure, 29 is a pulley which is rotated by a motor (not shown), 30 is a belt wound around the pulley 29, 31 is an electromagnetic clutch which is provided coaxially with the pulley 29, and 32 is the first to the first. 6 gear 32a
.About.32f, and a pulley 29 is connected to these first to sixth gears 32a to 32f via an electromagnetic clutch 31.
Is sequentially transmitted.

Reference numeral 33 is a head cam provided coaxially with the sixth gear 32f, and a cam groove 33 is provided in the head cam 33.
a is provided. A lower lever 34 is rotatably provided about a fulcrum pin 35, and the lower lever 34 is provided with first and second rollers 34a and 34b rotatably, respectively. The first roller 34a has a cam groove 33a.
Is fitted into.

Reference numeral 36 is an upper lever attached to the head support shaft 25, and a hook pin 36a is provided at the tip of the upper lever 36. A head U / D hook 37 is rotatably attached to the hook pin 36a, and the head U / D hook 37 is engaged with the second roller 34b. 38 is head U / D hook 37 and upper lever 36
A hook spring provided between the head U / D hook 37 and the head U / D hook 37 for engaging with the second roller 34b.

Reference numeral 39 is a pinch cam provided coaxially with the fourth gear 32d, and 40 is a pinch lever as a support member to which the pinch roller 28 is rotatably attached.
The pinch lever 40 is rotatable around its base end. Further, the pinch lever 40 is provided with a third roller 40a. The third roller 40a rotates while being constantly in contact with the outer circumference of the pinch cam 39 when the pinch lever 40 is biased toward the platen roller 1 by a spring or the like.

Next, the normal head U / D operation and the opening / closing operation of the pinch roller 28 will be described. When the pulley 29 is rotated by the motor, the electromagnetic clutch 31 is turned on / off to transmit the rotation to the first gear 32a. The rotation of the first gear 32a is transmitted to the sixth gear 32f via the second to fifth gears 32b to 32e. When the sixth gear 32f rotates, the coaxial head cam 33 rotates.

Due to the rotation of the head cam 33, the first roller 34a moves in the cam groove 33a, and the lower lever 34 moves to the fulcrum pin.
Swing about 35 in the direction of arrow C in FIG. This swing is transmitted to the upper lever 36 via the head U / D hook 37, and the upper lever 36 swings in the direction of arrow D in FIG. This upper lever
The swing of 36 causes the arm 26 to rotate together with the head support shaft 25, and the thermal head 2 is brought into contact with and separated from the platen roller 1 as shown in FIGS. 3 and 4.

On the other hand, since the opening / closing operation of the pinch roller 28 is linked with the head U / D operation, it is the same as the above until the rotation of the fourth gear 32d. When the fourth gear 32d rotates, the coaxial pinch cam 39 rotates. Since the third roller 40a is always in contact with the outer circumference of the pinch cam 39, when the pinch cam 39 rotates, the pinch lever 40 swings in the direction of arrow E in FIG. 3 according to the shape of the pinch cam 39. As a result, the pinch roller 28 is opened and closed in conjunction with the operation of the thermal head 2.

FIG. 5 is an explanatory view for explaining the dividing operation of the head U / D mechanism portion when the cover is opened. In the figure, 41 is a release lever pin attached to the upper lever 36, and 42 is a dogleg-shaped release lever whose middle portion is rotatably attached to the release lever pin 41. Is a release pin 42a erected at one end,
It has a release groove 42b provided at the other end. The connecting bar 27 contacts the release pin 42a.
Reference numeral 43 is a hook pin standing on the head U / D hook 37, and the hook pin 43 is engaged with the release groove 42b.

Next, the head U / D when the cover 22 is opened
The dividing operation of the mechanical unit will be described. In FIG. 1, when the knob 23 is pulled, the connecting bar 27 is pulled and slides as described above. In FIG. 5, when the connecting bar 27 moves in the direction of arrow F, its tip presses the release pin 42a. As a result, the release lever 42 rotates about the release lever pin 41. By the rotation of the release lever 42, the hook pin 43 engaged with the release groove 42b is pushed down.

When the hook pin 43 is pushed down, the head U / D hook 37 pivots against the hook spring 38 and is disengaged from the second roller 34b. From this state,
If you pull 23 further, the cover 22
Is opened. That is, when the knob 23 is pulled, the head U / D hook 37 comes off first, and then the cover hook 24 comes off and the cover 22 opens. Therefore, when the cover 22 is opened, the head U /
The D hook 37, the upper lever 36, the release lever 42, etc. are separated from the lower lever 34, etc. and move to the position indicated by the chain double-dashed line in FIG.

FIG. 6 shows the pinch cam 39 (FIG. 3) when the cover is opened.
FIG. 6 is an explanatory diagram for explaining an operation of driving the motor in reverse. In the figure, 51 is a pinch opening gear that meshes with the sixth gear 32f. The pinch opening gear 51 is provided with first and second pins 51a and 51b which are erected on both sides of the rotation center. There is. Reference numeral 52 denotes a reversing lever attached to the head supporting shaft 25, and the reversing lever 52 rotates together with the head supporting shaft 25 to come into contact with the first or second pin 51a, 51b.
The pinch roller separating means 53 of this embodiment includes the head support shaft 25, the arm 26, and the fourth to sixth gears 32d to 32.
f, pinch cam 39, pinch release gear and reverse lever 52
It consists of

Next, when opening the cover 22, a pinch roller is used.
The operation of opening 28 will be described. In FIG. 1, when the cover 22 is opened, the arm 26 and the head support shaft 25 are rotated accordingly. In FIG. 6, when the head support shaft 25 rotates clockwise, the reversing lever 52 attached thereto also rotates from the solid line state to the two-dot chain line state. At this time, one of the first and second pins 51a and 51b (here, the second pin 51b) is pressed by the reverse rotation lever 52, and the pinch opening / closing gear 51 is rotated in the direction of arrow G in FIG. It By the rotation of the pinch separating gear 51, the pinch cam 39 is reversely driven via the fourth to sixth gears 32d to 32f, and the pinch roller 28 is separated from the platen roller 1 via the pinch lever 40.

Therefore, in the thermal printer of this embodiment, when the cover 22 is opened when a paper jam occurs, not only the thermal head 2 but also the pinch roller 28 are automatically separated from the platen roller 1, so that the paper jam process is prevented. It's very easy.

When the pinch opening / closing gear 51 rotates,
The head cam 33 is also driven in the reverse direction and brought into the open state. Therefore,
When the cover 22 is closed again, the thermal head 2 takes the open position as shown in FIG. 3, so that the thermal head 2 does not collide with the platen roller 1 and be damaged when the cover 22 is closed.

Further, when the head cam 33 and the pinch cam 39 are in the open position, the first and second pins 51a, 51b are provided.
Since the position is as shown in FIG. 5, even if the cover 22 is opened in this state, the reverse rotation lever 52 does not swing. That is, even if the cover 22 is opened while the thermal head 2 and the pinch roller 28 are separated from the platen roller 1, the pinch roller separating means 53 does not operate.

Furthermore, in this embodiment, in order to reduce the reverse rotation assisting angle of the first and second pins 51a and 51b, the ratio between the sixth gear 32f and the pinch separating gear 51 is 1 :.
I have set it to 2. Since the gear ratio is 1: 2, the number of pins is 2.

Further, in this embodiment, since the mechanism for opening the head cam 33 when the cover is opened and the mechanism for opening the pinch cam 39 are both used, an increase in the number of parts is prevented. Furthermore, since the pinch-separating gear 51, which is a drive source, is arranged at a position near the head support shaft 25, the force for opening the cover 22 is efficiently transmitted.

The pinch roller separating means 53 is a cover.
It suffices that the pinch roller 28 can be separated from the platen roller 1 in conjunction with the opening operation of 22, and the invention is not limited to the above embodiment. Although only the pinch roller 28 on the paper feed side is shown in the above embodiment, the present invention can be applied to a printer having a pinch roller on the paper discharge side as in the conventional example. Furthermore, although the thermal printer is shown in the above embodiment, the present invention can be applied to other printers.

[0032]

As described above, in the printer of the present invention, the pinch roller separating means for separating the pinch roller from the platen roller in conjunction with the opening operation of the cover is provided with a support member for the pinch roller and the cover. Since it is provided between them, there is no need to manually open the pinch roller when a paper jam occurs,
This has the effect of facilitating the paper jam processing at the platen section.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a thermal printer according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a state in which a cover of FIG. 1 is opened.

3 is a configuration diagram showing a head-up state of an up / down mechanism portion of the thermal head 2 in FIG. 1. FIG.

FIG. 4 is a configuration diagram showing a head-down state of FIG.

FIG. 5 is an explanatory diagram for explaining a division operation of the head U / D mechanism portion when the cover of FIG. 1 is opened.

FIG. 6 is an explanatory diagram for explaining an operation of driving the pinch cam in the reverse direction when the cover of FIG. 1 is opened.

FIG. 7 is a configuration diagram showing a main part of an example of a conventional thermal printer.

FIG. 8 is a bottom view without the thermal head of FIG.

9 is a configuration diagram showing a state in which the pinch roller of FIG. 7 is in contact with a platen roller.

FIG. 10 is a configuration diagram showing a state in which the pinch roller of FIG. 7 is separated from the platen roller.

[Explanation of symbols]

 1 Platen Roller 21 Main Body Case 22 Cover 28 Pinch Roller 40 Pinch Lever (Supporting Member) 53 Pinch Roller Release Means

Claims (1)

[Claims] 1. A main body case having an openable / closable cover, a platen roller provided in the main body case, a pinch roller contacting with and separating from the platen roller, a support member for the pinch roller, and the cover. A printer provided with a pinch roller separating means for separating the pinch roller from the platen roller in association with an opening operation of the cover.