JP2656140B2 - Label printer - Google Patents

Abstract

PURPOSE:To enable a printer to be easily restored to a proper condition when papers are jammed by a method wherein a paper guide plate is attached detachably to a frame by pressing with an energizing member the paper guide plate between its engaging part and a point at which it comes into contact with a paper feed roller. CONSTITUTION:A paper feed roller 54 is set freely rotatably across frame side plates 14 and 15 provided on a frame 12. Since plate springs 70 exert a pressure against an intermediate paper guide plate 65 between a point at which it contacts a paper feed roller 54 and an engaging shaft 68, the paper guide plate 65 is urged to rotate clockwise on the engaging shaft 68 and the front end thereof is held against the paper feed roller 54 under a predetermined force. For this reason, locking projecting parts 69 at both the ends of the engaging shaft 68 are lifted beyond a locking groove 64 of a connecting projecting part 63 with a tab 66 provided at the rear end of the paper guide plate held between the fingers and pulled out rearward obliquely as shown by the arrow and then from between the paper feed roller 54 and the plate springs 70.

Description

Description: TECHNICAL FIELD The present invention relates to a label printer that prints a product name, a bar code, and the like on a label that is releasably attached to a long sheet of paper, and particularly relates to a label printer. Regarding the feed structure.

2. Description of the Related Art Labels for printing a product name, a price, a barcode, and the like are attached to one surface of a long mount in the longitudinal direction so as to be peelable. When printing the product name, price, bar code, or the like on these labels, the labels are continuously printed using a label printer.

The label printer has a printing mechanism including a platen roller and a print head in a frame constituting the main body,
When the backing sheet on which the label is attached, that is, the paper is sent, the label is printed by the printing head. After this printing, the paper is sent and the next label is printed.

The paper feed at this time is detected by the label detection device, and based on this, the feed is controlled so that the feed amount of the paper does not vary, and printing can be performed at an appropriate position for the next label. .

The printer is provided with a paper feeding device for feeding the paper to the printing mechanism.

A conventional paper feeder includes a plurality of paper feed rollers that are in contact with each other, and one of the rollers is rotationally driven by a motor or the like so that the paper is forcibly fed while sandwiching the paper between the rollers as the rollers rotate. Had become.

However, in the case of using a plurality of rollers as described above, since these rollers are arranged in the radial direction, a large space is required in the radial direction, and the axes of these rollers are not accurately installed in parallel with each other. And the paper cannot be sent reliably.

In order to solve such a drawback, a paper feed device is provided with a paper feed roller that is driven to rotate, the paper feed roller being brought into contact with the paper feed roller to sandwich the paper, and feed the paper between them. It is conceivable to use a paper guide plate.

This presses the back of the paper guide plate with an urging member such as a spring, and the pressing force of the spring member brings the paper guide plate into contact with the paper feed roller with an appropriate pressure contact force. The paper can be interposed between the paper feed roller and the paper feed roller, and the paper can be fed out with the rotation of the paper feed roller.

[Problems to be Solved by the Invention] When the paper feed roller, the paper guide plate, and the urging member constitute a paper feed device, the following is a concern.

That is, when the sheet with the label attached thereto is fed into the sheet feeding device, the end of the attached label may be turned up, and may be bent and adhere to the sheet guide plate. Since glue is adhered to the back of the label, the turned label sticks to the paper guide plate, and there is a concern that the paper is not fed, that is, a so-called paper jam occurs.

In such a case, it is necessary to remove the attached label and correct it so that normal feeding can be performed.

However, when the paper guide plate and the spring member are fixed to the frame inside the main body case, when performing the work of clearing the jam, it takes time to attach and detach the spring member and the paper guide plate, and the work efficiency is improved. There is no defect.

Further, since the paper guide plate must be pressed by a spring member and abut against the paper feed roller, one end of the paper guide plate must be rotatably supported by a frame or the like. There is a problem that becomes complicated.

The present invention has been made based on such circumstances,
An object of the present invention is to provide a label printer in which a support structure of a paper guide plate is simple, a structure of pressing a paper feed roller by a spring member is also simple, and maintenance in the case of paper jam or the like is easy. is there.

[Means for Solving the Problems] In order to achieve the above object, in the label printer of the present invention, printing is sequentially performed on a large number of labels attached to a frame constituting a main body in a paper feeding direction. A printing mechanism including a platen to be applied and a printing head is provided, and a paper feed roller for supplying the paper to the printing mechanism and a paper feed roller pressed against the paper feed roller to forcibly feed the paper between the rollers. A paper feed mechanism comprising a paper guide plate and a biasing member for pressing the paper guide plate against a paper feed roller is provided, and an engaging portion is provided on the frame or a member fixed to the frame, and at one end of the paper guide plate. An engaging portion is provided which is detachably engaged with the engaging portion and rotatably supports the paper guide plate in the engaged state. A supporting mechanism is constituted by the engaging portion and the engaging portion, the other end of the paper guide plate abuts on the paper feed roller, and the urging member is fixed to the frame or the frame. Then, the sheet guide plate is detachably attached to the frame by pressing between the locking portion of the sheet guide plate and a position where the sheet guide plate comes into contact with the sheet feed roller.

[Operation] According to the present invention, the paper guide plate includes:
One end is supported by the engaging portion via the engaging portion, and the other end is in contact with the paper feed roller. The engaging portion and the paper feeding roller are located between the engaging portion and the paper feed roller by an urging member. Pressing the paper guide plate makes the support structure of the paper guide plate simple, and the paper guide plate can be easily taken out by pulling it out.Therefore, there is no need to operate any special parts outside. The solution work can be easily performed.

Moreover, since the biasing member presses the portion of the paper guide plate located between the locking portions from the point of contact with the paper feed roller, the end of the paper guide plate can be pressed against the paper feed roller with a predetermined force. The paper can be reliably sandwiched and sent out.

[Embodiment] An embodiment of the present invention will be described below with reference to a thermal transfer type (a ribbon attached to a sheet is heated by a line thermal head and the ink of the ribbon is transferred to a label for printing) as shown in the drawings. The label printer will be described.

FIGS. 5 to 7 show the overall structure. In these figures, reference numeral 1 denotes a main body case, which covers the upper part of the base 2.
Although not shown in detail, the main body case 1 has a front panel, a side panel, a rear panel, and a ceiling panel, and at least one of these panels is detachably provided so that the inside can be exposed.

The main body case 1 covers a frame 12 provided above the base 2. The frame 12 is formed by connecting a horizontally disposed frame bottom plate 13 and frame side plates 14 and 15 which are vertically erected on both left and right ends of the frame bottom plate 13 and are opposed to each other.

As shown in FIG. 6 and FIG. 7, a supporting projection 16 is opposed to and integrally protrudes from the upper end of the intermediate portion in the front-rear direction of each of the frame side plates 14 and 15. A spring support plate 71, which will be described later, extends between the support protrusions 16.

A mechanism 11 for printing is provided at the front end of each frame side plate 14, 15.
11 will be described.

Each of the frame side plates 14 and 15 is formed with a long hole 17 which is located on the front side and extends vertically.

The printing mechanism unit 11 includes a platen unit 21. The platen unit 21 is disposed between the frame side plates 14 and 15, and is rotatably supported by the side plates 14 and 15.

That is, the platen unit 21 is formed to include the fulcrum shaft 22, a pair of end plates 23, a platen roller 24, an intermediate shaft 25, and a pressure spring 26.

More specifically, as shown in FIG. 5 and FIG.
Reference numeral 22 denotes a frame extending across the frame side plates 14 and 15, which are fixed to the frame side plates 14 and 15 so as not to rotate. The pair of end plates 23 provided to face each other has a flat plate structure, and is disposed near each of the frame side plates 14 and 15. The rear ends of these end plates 23 are fitted to the fulcrum shaft 22. In this fitting, each end plate 23 is individually supported with respect to the fulcrum shaft 22.
It is configured to be able to rotate around the 22 axis.

A bearing 27 is attached to the front end of each end plate 23. These bearings 27 have a platen shaft 28 of a platen roller 24.
Are supported therethrough. This allows the platen roller
24 is straddled across the front end of both end plates 23, and these bearings
It is rotatably supported by 27. The platen shaft 28 has large-diameter shaft portions 29 protruding from both ends of the platen portion.

The intermediate shaft 25 is located between the fulcrum shaft 22 and the platen roller 24 and is laid across the frame side plates 14 and 15.
The intermediate shaft 25 is rotatably fitted to each end plate 23. And both ends of the intermediate shaft 25 are frame side plates 14,15.
Is inserted in each of the long holes 17.

The pressure spring 26 is, for example, a torsion spring. Only one spring 26 is used, and the fulcrum shaft 22 of this spring 26 is used.
Is wound around the center in the length direction. One end 31 of the pressure spring 26 serving as a power point is hooked on a pin 33 of a spring receiver 32 fixed to the fulcrum shaft 22 as shown in FIGS. The other end portion 34 acting as the action portion of the pressure spring 26
Is the center of the intermediate shaft 25 in the longitudinal direction, more precisely, each end plate 23.
At a portion corresponding to a point exactly 1/2 of the separation distance therebetween, the portion is hooked on the intermediate shaft 25 as shown in FIG.

In FIG. 6, reference numeral 35 denotes a final paper guide for guiding the paper toward the printing mechanism 11. This is provided on the upper part of the platen unit 21 so as not to hinder the movement of each end plate 23.

A sheet feed drive device is provided on the left frame side plate 14 in FIG.
41 are provided.

As shown in FIGS. 5 and 7, the driving device 41 includes a driving motor 42, first and second winding transmission mechanisms 43 and 44,
It is provided with a pair of transmission gears 45 and 46.

The drive motor 42 is a pulse motor, which is fixed to the inner surface of the frame side plate 14, and the motor shaft 47 passes through the frame side plate 14. The first winding transmission mechanism 43
A pulley 48 fixed to the motor shaft 47, a pulley 49 rotatably attached to the frame side plate 14, and both pulleys 4
The transmission belt 50 is formed over 8,49. The second wrapping transmission mechanism 44 includes a pulley rotatably mounted on the left end (in FIG. 5) of the fulcrum shaft 22.
5, a pulley 52 fixed to the left end (in FIG. 5) of the platen shaft 28, and a transmission belt 53 wound around the two pulleys 51, 52.
A transmission gear 45 is formed integrally with the pulley 49. A transmission gear 46 is also formed integrally with the pulley 51. These transmission gears 45 and 46 are meshed with each other.

Therefore, the driving motor 42 of the paper feed driving device 41
When the motor shaft 47 is rotated in the counterclockwise direction in FIG. 7, the first winding transmission mechanism 43 is rotated in the same direction. This rotation is transmitted to the second winding transmission mechanism 44 via the engagement of the transmission gears 45 and 46. For this reason, the platen roller 24 is rotated in the clockwise direction in FIG. 7 together with the pulley 52 of the transmission mechanism 44, whereby the paper is fed.

A paper feed roller 54 is rotatably suspended on the frame side plates 14 and 15. The paper feed roller 54 is disposed close to the rear end of the platen unit 21. A gear 56 is attached to the roller shaft 55 of the paper feed roller 54 at one end on the side of the frame side plate 14, and the gear 56 is meshed with the transmission gear 45. Accordingly, the paper feed roller 54 is rotated clockwise in FIG. 7 in conjunction with the paper feed drive device 41.

At the rear position of the paper feed roller 54, a lower paper guide 61 on the entrance side is provided as shown in FIG. This lower paper guide 61 also serves as a first sensor holder,
This lower paper guide 61 has both ends at the frame side plate.
It is screwed to 14 and 15, respectively, and fixed horizontally.

Above the lower paper guide 61 on the entrance side, an upper paper guide 62 on the entrance side is provided close to the lower paper guide 61. Although not shown in detail, the upper paper guide 62 can be adjusted in the left-right direction according to the width of the paper.

At the front portion of the lower paper guide 61, upward connecting projections 63 (shown in FIGS. 1 to 4, 6 and 7) are integrally provided at both left and right end positions. These connecting projections 63 are provided with notch-shaped engaging grooves 64 opened upward. The engagement groove 64 forms an engagement portion of the present invention.

An intermediate paper guide plate 65 is detachably attached to these connecting protrusions 63. The intermediate sheet guide plate 65 corresponds to the sheet guide plate of the present invention, and in this embodiment, also serves as the second sensor holder.

This intermediate paper guide plate 65 is formed of sheet metal,
It is bent like a sled from the front end to the rear end. The rear end of the intermediate paper guide plate 65 faces the entrance-side lower paper guide 61 and continues to the front end of the entrance-side upper paper guide 62, and the front end is disposed close to the rear upper surface of the final paper guide 35. ing.

The lower surface of the front end of the intermediate paper guide plate 65 is in contact with the paper feed roller 54.

A gripping tongue is provided at the rear end of the intermediate paper guide plate 65.
66 is extended integrally and is located on both left and right sides
67, 67 are cut and raised. These left and right support tongues
A locking shaft 68 extends between 67 and 67. This locking shaft
Both ends of the projection 68 project outside the supporting tongue pieces 67, 67, and these projection ends form a locking projection 69 as a locking portion of the present invention.

These locking projections 69 are detachably locked in the engagement grooves 64 of the connection projection 63 formed on the lower paper guide 61.

In this case, the locking projection 69 is rotatably supported by the engagement groove 64 and can be pulled out upward.

Such an intermediate paper guide plate 65 is a pair of leaf springs.
It is pushed downward at 70, 70. The leaf springs 70 are fixed to a spring support plate 71.

The spring support plate 71 is bridged between the support protrusions 16 integrally provided on the frame side plates 14 and 15, and is fixed to the support protrusions 16 with screws (not shown) or the like.

The leaf spring 70 near the end of the spring support plate 71,
70 is fixed by means such as spot welding or the like, so that the upper surfaces of the left and right ends of the intermediate paper guide plate 65 are pressed by the leaf springs 70, 70.

In this case, the leaf springs 70, 70
The intermediate paper guide plate 65 biases the intermediate paper guide plate 65 to rotate in the clockwise direction shown in the figure around the locking shaft 68 from the point in contact with the paper feed roller 54 of FIG. Thus, the front end of the intermediate paper guide plate 65 is pressed against the paper feed roller 54 with a predetermined force.

For this reason, the intermediate paper guide plate 65 grips the gripping tongue piece 66 provided at the rear end and moves the locking projections 69 at both ends of the locking shaft 68 upward from the engagement groove 64 of the coupling projection 63. If it is pulled out and pulled out obliquely rearward as shown by the arrow in FIG. 2, it can be pulled out from between the paper feed roller 54 and the leaf springs 70, 70.

The paper (not shown) supported by the roll holder 72 mounted on the rear surface of the main body case 1 passes between the lower paper guide 61 and the upper paper guide 62 on the entrance side, and the paper feed roller 54 and the intermediate paper guide plate. Guided between 65. Then, the paper is fed between the intermediate paper guide plate 65 and the final paper guide 35 by the frictional force with the roller 54, and is guided by the upper surface of the final paper guide 35 to be printed.
Is to be led to.

A light projector 75 is attached to the lower paper guide 61, which also serves as the first sensor holder, as shown in FIG.
This light emitter 75 is composed of a light emitting diode. This floodlight 75
A light receiver 76 is attached to the intermediate paper guide plate 65 which also serves as the second sensor holder in opposition to the first embodiment.

The light emitter 75 projects light toward the light receiver 76, and the light receiver 76 includes a lower paper guide 61 and an intermediate paper guide plate 65.
And receives the light transmitted through the paper passing between them. Receiver 76
Since the amount of light incident on the part differs between the part with the label and the part without the label, the light receiver 76 outputs a signal corresponding to the amount of light received. Therefore, by such label detection,
A control device (not shown) controls the operation of the paper feed driving device 41 based on an output signal from the light receiver 76. In this way, control is performed so that the sheet is fed by an appropriate amount.

A ribbon sensor 77 is attached to the spring support plate 71 as shown in FIG. This ribbon sensor 77 will be described later.

A line thermal head 80 is mounted above the platen unit 21 as described above. The line thermal head 80 is fixed to a head frame (not shown), and the head frame is
Attached to. For this reason, a line thermal head
The platen roller 24 is pressed against the 80 so as to be able to come and go.

The thermal printer of the present embodiment can be used in either a thermal transfer type or a thermal type. In this embodiment, a thermal transfer type is used. Therefore, the above line thermal head
Above 80, a ribbon device 90 is attached.

Although the ribbon device 90 is not described in detail, as shown in FIG. 6, a ribbon supply roller 92 around which an ink ribbon 91 is wound is provided.
And intermediate rollers 93, 94, 95, a ribbon take-up roller 96, and the like. The ribbon take-up roller 96 is driven to rotate by a pulse motor (not shown). The pulse motor is controlled by the control device, and is operated in conjunction with the sheet feeding.

The ribbon 91 fed out from the ribbon supply roller 92 is passed between the platen roller 24 and the line thermal head 80 via the intermediate rollers 93 and 94, and during this time, a predetermined temperature is applied to the label by the thermal transfer action of the line thermal head 80. Perform printing. Then, the ribbon 91 on which printing has been completed is transferred to the intermediate roller 95.
, And is wound around the ribbon winding roller 96.

For the ink ribbon 91 sent along such a path, the ribbon sensor 77 attached to the spring support plate 71
It is arranged to face the ribbon passing between the intermediate rollers 93 and 94. Therefore, the ribbon sensor 77 can detect a ribbon breakage or the like.

 The operation of the embodiment having such a configuration will be described.

The unillustrated paper supported by the roll holder 72 mounted on the rear surface of the main body case 1 is a lower paper guide 61 on the entrance side.
And between the paper feed roller 54 and the intermediate paper guide plate 65. Since the intermediate paper guide plate 65 is pressed against the paper feed roller 54 by the leaf springs 70 and 70, the intermediate paper guide plate 65 presses the paper against the paper feed roller 54, and the friction between the intermediate paper guide plate 65 and the roller 54 causes the paper to be intermediate. The paper is fed between the paper guide plate 65 and the final paper guide 35, guided by the upper surface of the final paper guide 35, and guided to the printing mechanism 11. In the printing mechanism 11,
The sheet is passed between the platen roller 24 and the line thermal head 80.

While the paper passes between the lower paper guide 61 and the intermediate paper guide 65, light is emitted from a light emitter 75 provided on the lower paper guide 61, and this light is incident on a light receiver 76 provided on the intermediate paper guide plate 65. . Since the amount of incident light is different between a part where the label is present and a part where the label is not present, the optical receiver 76 outputs a signal corresponding to the amount of received light, and by such label detection, based on the output signal from the optical receiver 76. A control device (not shown) controls the operation of the paper feed driving device 41.

On the other hand, the ribbon 91 fed from the ribbon supply roller 92 of the ribbon device 90 is passed between the platen roller 24 and the line thermal head 80 via intermediate rollers 93 and 94, during which the thermal transfer of the line thermal head 80 is performed. A predetermined printing is performed on the label by the action.

When the ribbon is broken, it can be detected by the ribbon sensor 77.

If there is a problem such that the attached label is peeled off and adheres to the intermediate paper guide plate 65 on the paper passing between the intermediate paper guide plate 65 and the paper feed roller 54, the main body case 1 is removed and the intermediate paper is removed. The locking tongue 66 provided at the rear end of the guide plate 65 is gripped by the locking projection of the locking shaft 68.
69 is pulled out from the engaging groove 64 of the connecting projection 63 and removed. In this state, the tongue piece 66 is gripped and the intermediate paper guide plate 65 is held.
2 can be pulled out from between the paper feed roller 54 and the leaf springs 70, 70 by pulling out the sheet obliquely as shown by the arrow in FIG.

As a result, the trouble causing the paper jam can be corrected, and the intermediate paper guide plate 65 can be inserted again in the direction opposite to the arrow in FIG. 2 and can be inserted between the paper feed roller 54 and the leaf springs 70, 70. .

According to such a configuration, the intermediate paper guide plate 65
It is not necessary to operate a special part outside in order to attach / detach, and the attaching / detaching operation, that is, the paper jam clearing operation can be easily performed.

When the intermediate paper guide plate 65 is set, the rear end portion of the intermediate paper guide plate 65 is engaged with the engagement groove 64 of the connection projection 63 formed on the lower paper guide 61 by the locking projection 69 of the locking shaft 68. The front end of the intermediate paper guide plate 65 is in contact with the paper feed roller 54, and these locking projections 69 are located between the paper feed rollers 54 so that the upper surface of the intermediate paper guide plate 65 is , The support structure of the intermediate paper guide plate 65 is simplified.

In addition, since the leaf springs 70, 70 press the portion of the intermediate paper guide plate 65 located between the locking shafts 68 from the point of contact with the paper feed roller 54, the front end of the intermediate paper guide plate 65 is Therefore, the sheet is pressed with a predetermined force, and the sheet can be reliably sandwiched and sent out.

That is, since the leaf springs 70 simultaneously perform the mechanical holding of the intermediate paper guide plate 65 and the pressing action of the intermediate paper guide plate 65, the structure is simplified.

Further, the leaf springs 70, 70 are provided between the support projections 16 provided on the frame side plates 14, 15 of the main body frame 12, and the spring support plate 71
Even if the intermediate paper guide plate 65 is inserted and removed, the intermediate paper guide plate 65 can slide back when the intermediate paper guide plate 65 is inserted and removed. Each time, leaf spring 70, 70 or spring support plate
There is no need to remove 71.

Since the ribbon sensor 77 is mounted on the spring support plate 71, no special support member for mounting the ribbon sensor 77 is required, the configuration is simplified, and the space can be effectively used.

In the above embodiment, the connecting protrusion 63 is provided on the lower paper guide 61 fixed to the frame 12, and the connecting protrusion 63 is provided in the engaging groove 64 corresponding to the engaging portion of the present invention. Although the locking projection 69 provided at the rear end of the paper guide plate 65 is detachably locked, the engagement groove 64 corresponding to the above-described engagement portion is provided.
Is not limited to being formed on the lower paper guide 61, but may be formed on the side plates 14 and 15 of the frame 12.

Also, a spring support plate 71 for supporting the leaf springs 70, 70 is provided.
Is not limited to being formed on the side plates 14 and 15 of the frame 12, but may be attached to a lower paper guide 61 fixed to the frame 12.

The print head used in the present invention is not limited to a thermal head, and the platen is not limited to a roller type.

[Effects of the Invention] As described above, according to the present invention, the paper guide plate has one end supported by the engagement portion via the engagement portion and the other end in contact with the paper feed roller. Since the urging member is located between the paper feed rollers and pressed against these engagement portions and the paper feed roller, the support structure of the paper guide plate is simplified. When the paper guide plate is pulled out to one end side, the paper guide plate can be taken out by slidingly contacting the urging member, and there is no need to operate any special parts, so that the attachment / detachment work can be easily performed. Therefore, the paper jam can be easily eliminated.

Moreover, since the biasing member presses the portion of the paper guide plate located between the locking portions from the point of contact with the paper feed roller, the end of the paper guide plate can be pressed against the paper feed roller with a predetermined force. The paper can be reliably sandwiched and sent out.

[Brief description of the drawings]

1 is a perspective view showing a paper feed mechanism, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a line III-III in FIG. FIG. 4 is a sectional view of FIG.
FIG. 5 is a front view showing the configuration of the frame and the paper feed drive device, FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5, and FIG. 7 is a VII- line in FIG. It is an arrow view of the VII line. 11 ... printing mechanism, 12 ... frame, 14, 15 ... frame side plate, 16 ... support protrusion, 24 ... platen roller, 41 ...
… Paper feed drive device, 42… drive motor, 54… paper feed roller, 61… entrance side lower paper guide, 62… entrance side upper paper guide, 63… connecting projection, 64… engagement groove, 65 ……
Intermediate paper guide plate, 66… gripping tongue, 67… support tongue, 68… locking shaft, 69… locking protrusion, 70… leaf spring,
71 ... Spring support plate, 80 ... Line thermal head.

Claims (1)

(57) [Claims] 1. A frame constituting a main body, a printing mechanism provided on the frame, the printing mechanism comprising a platen and a print head for sequentially printing a large number of labels adhered along a paper feeding direction; A paper feed roller that supplies the paper to the printing mechanism, a paper guide plate that is pressed against the paper feed roller, and forcibly feeds the paper between the rollers and the paper guide plate. A paper feed mechanism comprising an urging member for pressing against a feed roller; an engaging portion provided on the frame or a member fixed to the frame; and an end of the paper guide plate releasably engaged with the engaging portion. And a support mechanism comprising a locking portion for rotatably supporting the paper guide plate in a locked state, the other end of the paper guide plate being provided. Abuts on the paper feed roller and fixes the urging member to the frame or this frame, and presses the urging member between the locking portion of the paper guide plate and a position where it comes into contact with the paper feed roller. A label printer wherein the paper guide plate is detachably attached to a frame.