JP2002128328A - Cassette type printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate exchanging work of a paper roll and maintenance work of each component, and to improve operability of operations required for the works. SOLUTION: A cassette 203 having paper holding part 206 and a platen 207 is made drawable out of a body case 201, a printing head 204 facing to the platen 207 is jumped up while being drawn in response to the drawing operation of the cassette 203, and the printing head 204 is stored in response to a pressing operation of the cassette 203. Such operations of the printing head 204 are performed with respect to the drawing and pressing operations of the cassette 203 to a halfway part. Thus, setting work or the like of the paper roll for a paper roll holding part 206 is facilitated, and its operability is improved. When the printing head 204 is drawn out and jumped up, a cutter disposed at its tip moves to an evacuating position to be covered with a cutter cover 231 to secure safety.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for printing on roll paper.

[0002]

2. Description of the Related Art As a printer for printing on roll paper, not only a printer that has conventionally been constructed as a single printer, but also a printer that is incorporated into an electronic weighing apparatus and issues labels and receipts, There is a so-called built-in type, such as a structure that is incorporated in an electronic cash register to issue a receipt or record a journal.

[0003] Regarding such a printer, it is often desired to facilitate the operation of exchanging roll paper and to reduce the size and thickness of the entire apparatus regardless of the type of printer. In particular, in the case of a built-in type printer, since the volume of the printer greatly affects the external size and internal space of a device for housing the printer, for example, an electronic weighing device or an electronic cash register, the size and thickness of the printer are further reduced. desired.

[0004]

From the standpoint of facilitating the replacement of roll paper and the maintenance work of each part, it is a reality that the conventional printer cannot be said to have good workability in such work. . For example, a conventional printer, particularly a printer built in an electronic weighing device or an electronic cash register, generally has a structure in which a printer cover is opened to replace a roll paper or to perform a maintenance operation of each part. However, with such a structure, generally, when setting the roll paper, it is necessary to pass the roll paper between the platen and the print head. There is a problem that the maintenance work is not easy because the peripheral structure of the head is complicated.

[0005] As described above, a conventional printer,
In particular, a printer built in a device such as an electronic weighing device or an electronic cash register generally has a structure in which a printer cover is opened to replace a roll sheet or to perform a maintenance operation of each unit. However, depending on the mounting position of the printer cover, there may be an undesirable restriction on the layout of such a device. For example,
Focusing on the printer built into the electronic weighing device,
If the printer cover is detachably attached to the side of the device, there is a problem that a certain installation space must be secured on the side of the device for the replacement of roll paper and the maintenance of each part. Further, in a printer built in the electronic weighing device, if the printer cover is detachably attached to the upper surface of the device, there is a problem that it is difficult to dispose the weighing dish above the printer cover. In this case, if the weighing dish is arranged above the printer cover, the workability of the exchange work of the roll paper and the maintenance work of each part is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to facilitate the replacement of roll paper and the maintenance of each part.

Another object of the present invention is to improve the operability of operations necessary for replacing roll paper and maintaining each part.

[0008]

According to a first aspect of the present invention, there is provided a cassette type printer comprising: a main body case; a cassette holding portion provided so as to be able to be pulled out from the main body case; A print head holder rotatably supported about a substantially horizontal axis perpendicular to the pull-out direction, and a print head attached to a free end of the print head; and a storage position where the cassette holding portion is stored in the main body case. Jumping means for positioning a print head at a printing position, rotating the print head holder so as to flip up the print head at a maximum withdrawal position where the cassette holding portion is withdrawn from the main body case at a maximum; and A cassette having a paper storage unit, which is provided so as to be able to be pulled out with respect to the unit, and a print head holder, A platen that is attached to the cassette so as to be rotatable about an axis parallel to a moving axis and that is housed in the cassette holding unit, the platen facing the print head at the printing position, and the cassette holding unit includes the cassette holding unit. In the section from the position to the maximum withdrawal position, the cassette holding portion and the cassette are connected, and when the cassette holding portion is positioned at the maximum withdrawal position, the cassette holding portion and the cassette are connected. And a printhead holder for movably positioning a cutter having a fixed blade structure between a paper cutting position downstream of the printing position in the paper transport direction and a retracted position retracted from the paper cutting position. And a cutter holding mechanism provided in the print head holder and exposing the cutter located at the paper cutting position. A cutter cover that covers the cutter positioned at the retracted position, and, when the cassette holding unit is positioned at the storage position, positions the cutter at the sheet cutting position and moves the cassette holding unit to the maximum withdrawal position. And a cutter position control mechanism for positioning the cutter at the retracted position when it is located.

Therefore, when the cassette is pulled out from the state in which the cassette holding portion is stored in the main body case and the cassette is stored in the cassette holding portion, the cassette and the cassette holding portion are connected by the latch mechanism, so that the cassette holding portion is held. The part is also pulled out with the cassette. When the cassette holding portion is pulled out to the maximum withdrawal position, the latch mechanism releases the connection between the cassette holding portion and the cassette, so that the cassette is pulled out from the cassette holding portion while the cassette holding portion is positioned at the large withdrawal position. On this occasion,
When the cassette holding portion is pulled out to the maximum pull-out position, the print head holder is rotated by the jumping means, and the print head is jumped up. Therefore, in a state where the cassette is pulled out or pulled out from the cassette holding portion, it is possible to easily perform the setting work of the roll paper on the roll paper holding portion and the maintenance work of each part. Also,
When the cassette holding portion is pulled out to the maximum withdrawal position, the print head is flipped up, and the cassette can be pulled out and pushed alone, so that the force required at that time can be reduced. As a result, a light operation feeling is obtained,
Operability when pulling out and pushing in the cassette is improved.

The cutter holding mechanism positions the cutter between the sheet cutting position and the retracted position when the cassette is moved between the storage position and the maximum withdrawal position. That is,
The cutter holding mechanism positions the cutter at the sheet cutting position when the cassette holding unit is located at the storage position, and enables cutting of the printed roll paper by the cutter. On the other hand, the cutter holding mechanism positions the cutter at the retracted position when the cassette holding unit is located at the maximum withdrawal position. Then, the cutter is covered with the cutter cover, and the hand of the operator is protected from the cutter.

According to a second aspect of the present invention, in the cassette type printer according to the first aspect, the cutter position control mechanism is formed by a cutter cam structure provided between the main body case and the cutter holding mechanism. .

Therefore, the movement of the cutter is controlled by the cam action of the cutter cam structure.

[0013]

An embodiment of the present invention will be described with reference to the drawings. This embodiment is an example of application to an electronic balance device.

FIG. 1 is a perspective view of an electronic balance device. The electronic weighing apparatus 1 has a weighing dish 3 on the entire upper surface of a flat housing 2, a display 4 with a touch panel on the front left side, and a printer 5 on the right front side.

The display 4 can be tilted. Therefore, from the state shown in FIG. 1, it is possible to tilt the display 4 and extend the lower edge thereof below the lower surface of the housing 2. This takes into account a usage mode in which the installation unit 6 of the housing 2 is placed on, for example, an upper surface of a showcase (not shown) to install the electronic weighing apparatus 1, and the display 4 is positioned below the upper surface of the showcase. The structure is as follows.

As shown in FIG. 1, the printer 5 has an issuing port 101 for issuing labels and receipts on the front of the housing 2. The issuing port 101 is provided in the housing 2
Are formed by an upper cover 102 and a lower cover 103 which constitute a part of the above. Upper cover 102 and lower cover 1
03 is screwed to the printer 5.

The printer 5 will be described in detail.

First, the schematic structure of the printer 5 will be described with reference to FIGS. 2 to 5 are perspective views of the printer 5, FIG. 2 is a perspective view showing a state in which the cassette and the cassette holder are both housed, and FIG. 3 is a state in which the cassette holder is pulled out to the maximum withdrawal position. FIG. 4 is a perspective view showing a state where the cassette is further pulled out, and FIG. 5 is a perspective view showing a state where the cassette is pulled out.

The printer 5 has a schematic structure in which a cassette holder 202 is housed in a main case 201 made of sheet metal so as to be able to be pulled out, and a cassette 203 is housed in the cassette holder 202 so as to be able to be drawn out. Have been. The cassette holding unit 202 has a line thermal head 204 as a print head so as to be able to jump up (see FIGS. 3 to 5), and has a cutter 205 having a fixed blade structure (see FIG. 2). The cassette 203 includes a paper holding unit 206 that stores and holds roll paper (not shown) and a platen 207.
And a label peeling plate 208 and a mount winding shaft 209 (see FIGS. 3 to 5).

Next, the detailed structure of the cassette 203 is shown in FIG.
This will be described with reference to FIG. FIG.
And FIG. 7 is a perspective view showing the left side surface.

The cassette 203 is an integrally molded product made of a resin mold, and a lower cover 103 constituting a part of the housing 2 is detachably attached to a front portion thereof. The lower cover 103 is also an integrally molded product of a resin mold. The cassette 203 has a sheet holding unit 206 located behind, a platen 207 and a label peeling plate 208 located forward, and a sheet winding shaft 2 in the center.
09 is located. A mounting wall 210 is provided on one side inside the cassette 203, and an opening 211 is formed on the other side facing the mounting wall 210. The mounting wall 210 is a structure that supports the platen 207, the label peeling plate 208, and the mount winding shaft 209 in a cantilever state, and the open portion 211 has a cutout structure.

The paper holding unit 206 has a concave shape capable of storing and holding roll paper.
6 is one side fence 2 formed by resin molding.
12 is slidably mounted. That is, in the paper holding unit 206, two metal support shafts 213 are erected from the mounting wall 210 of the cassette 203, and these support shafts 213 are attached to the side fences 21.
2 are fitted in two fitting holes. Thereby, the side fence 212 is connected to the two support shafts 21.
3 is slidably supported, and regulates the width of the roll paper that can be stored and held in the paper holding unit 206 by sliding.

FIG. 8 shows the platen 207 and the label release plate 20.
8 is a perspective view showing a right side surface of the cassette 203 from which a cantilever unit for unifying the cassette 8 and the mount winding shaft 209 is removed.
FIG. 9 is a perspective view showing the left side surface.

As shown in FIGS. 8 and 9, the platen 207, the label peeling plate 208 and the mount winding shaft 209
The cantilever unit 215 is supported by the sheet metal 214. The free ends of the platen 207 and the label peeling plate 208 are supported by another auxiliary sheet metal 216 to improve the positioning accuracy and secure the rigidity. In the cantilever unit 215, the platen 207 and the mount winding shaft 209 are rotatably mounted, and the cantilever unit 215 has a gear train 217 constituting a power transmission mechanism for the platen 207 and the mount winding shaft 209.
Is provided. As shown in FIG. 9, these gear trains 217 are arranged on the sheet metal 214 on the side opposite to the side on which the platen 207, the label peeling plate 208, and the mount winding shaft 209 are mounted.

The cantilever unit 215 is mounted on the mounting wall 210 of the cassette 203 by screws. In this case, the mounting wall 210 of the cassette 203
Has a gear cover 218 for accommodating the gear train 217, so that the cantilever unit 215 is mounted on the mounting wall 210 while the gear train 217 is housed in the gear cover 218.
Attached to. Thus, the cantilever unit 215
Is mounted on the mounting wall 210, the platen 207, the label peeling plate 208, and the mount winding shaft 209.
Are arranged along a substantially horizontal axis orthogonal to the pulling and pushing directions of the cassette 203.

Here, in the vicinity of the label peeling plate 208,
One label holding shaft 219 is attached between the sheet metal 214 and the auxiliary sheet metal 216 in parallel with the label peeling plate. The label holding shaft 219 has 2
Two label regulating members 220 are attached, and one of the label regulating members 220 is slidable. These label regulating members 220 are provided on the label peeling plate 2.
08 is a structure for restricting the side of the label (not shown) peeled off from the mount (not shown), thereby preventing the label from meandering. Here, FIGS. 6 to 9
In the middle, three label regulating members 220 are shown, but the label regulating member 220 shown at the center and the label regulating member 220 shown at the right side are the same, and two are shown in order to show the movement range. I have.

Next, the structural relationship between the main body case 201, the cassette holding portion 202, the cassette 203 and the structural components held by them will be described with reference to FIGS. In this case, description will be given while using FIGS. 1 to 9 as necessary. FIG. 10 is a right side view showing a state where the cassette 203 and the cassette holding unit 202 are both housed, and FIG.
FIG. 12 is a right side view showing a state in which the cassette 203 and the cassette holding unit 202 are further pulled out and the cutter 205 is positioned at the retracted position. FIG. FIG. 1 is a right side view showing a state where the cassette holding unit 202 is further pulled out.
4 is a right side view showing a state where the cassette holding unit 202 is pulled out to the maximum withdrawal position, and FIG. 15 is a right side view showing a state where the cassette 203 is pulled out.

In the cassette holder 202, the line thermal head 204 is elastically held by a rotatable link at the tip of the print head holder 221. The elastic force here is provided by a coil spring (not shown). The print head holder 221 is a sheet metal arm-shaped member rotatably attached to a holder shaft 222 that is a substantially horizontal axis that is orthogonal to the direction in which the cassette holding unit 202 is drawn and pushed. Such a print head holder 221 has a structure in which the line thermal head 204 is supported by a rotatable link at the front end thereof, and the attitude of the line thermal head 204 can be controlled according to a change in the position of the rear end. Has become. Therefore, in the present embodiment,
By controlling the position of the rear end side of the print head holder 221, a jump-up operation of the line thermal head 204 accompanying the sliding movement of the cassette holding unit 202 is realized. That is, the cam followers 223 are attached to the pair of rear end sides of the print head holder 221, respectively.
These cam followers 223 are engaged with groove cams 224 formed on both side walls of the main body case 201. The shape of the groove cam 224 is such that the print head holder 221 is rotated in a direction in which the line thermal head 204 is flipped up with the pull-out operation of the cassette holding unit 202, and the line thermal head 204 is moved with the pushing-in operation of the cassette holding unit 202. The control is performed so that the print head holder 221 can be controlled to rotate in the direction of returning to the printing position in contact with the platen 207. Here, a jumping-up means 225 having a flip-up cam structure for rotating the print head holder 221 so as to flip up the line thermal head 204 at the maximum withdrawal position where the cassette holding section 202 is pulled out from the main body case 201 to the maximum is formed. ing.

The print head holder 221 has a link member 226 at the tip end thereof which is rotatable around a rotation axis parallel to the holder shaft 222. The cutter 205 is fixed to the link member 226. ing. Thus, the cutter 205 is freely movable between a paper cutting position near the line thermal head 204 and a retracted position away from the line thermal head 204, and the cutter holding mechanism 227 is configured here. And the link member 2
26 and the tip of the print head holder 221, two coil springs SP are located on both sides thereof.
Is stretched over. Thus, the link member 226 is urged by the coil spring SP in a direction away from the line thermal head 204. A pair of cams 228 are formed on both sides of the upper surface of the link member 226, and cam followers 229 corresponding to the cams 228 are formed in the main body case 201.

When the cassette holding portion 202 is located at the storage position (see FIGS. 2 and 10), the cam 228 abuts on the cam follower 229 to move the link member 226 between the cam 228 and the cam follower 229. When the cassette holder 202 is rotated in the direction approaching the head 204 and the cassette holder 202 is pulled out to a certain extent, the cam 228 is formed so as to drop off from the cam follower 229.

Thus, when the cassette holding section 202 is located at the storage position, the link member 226 approaches the line thermal head 204 against the urging force of the coil spring SP, and the cutter 205 moves the line thermal head. It is positioned at the paper cutting position near 204 (see FIG. 10). On the other hand, after the cam 228 falls off from the cam follower 229, the link member 226 is pulled by the urging force of the coil spring SP, the link member 226 rotates in the direction away from the line thermal head 204, and the cutter 205 Thermal head 20
4 is located at the retracted position away from the position 4 (see FIGS. 11 to 15). Thus, a cutter position control mechanism 230 having a cutter cam structure is configured. Therefore, the print head holder 221 is provided with the cutter 20 positioned at the paper cutting position.
A cutter cover 231 that exposes the cutter 5 and covers the cutter 205 located at the standby position is attached.

On the back side of the cam 228, a cam (not shown) having substantially the same shape is provided. The cam has a structure in which a pressing force is applied to the line thermal head 204 supported by the rotatable link of the print head holder 221 by a cam action with the cam follower 229.
That is, the cam (not shown) provided on the back side of the cam 228 causes the line thermal head 2 to move against the platen 207 by the cam action with the cam follower 229 when the cassette holding unit 202 is located at the storage position.
04 functions as an abutment. Here, a head cam mechanism 232 that urges the line thermal head 204 in a direction to increase the contact force with the platen 207 according to the movement of the cassette holding unit 202 to the storage position is configured.

The link member 226 has the cam 22
8 and a pair of cams (not shown) on the back side thereof are provided, so that a space is formed between the pair of cams 228 and the cams (not shown) on the back side. Therefore, in the present embodiment, the wiring cable (not shown) of the line thermal head 204 is stored in a folded state using this space.

Next, FIGS. 10 to 15 show a process of pulling out the cassette holding portion 202 and the cassette 203 in order. In the process of pulling out the cassette holding unit 202 and the cassette 203, the cassette holding unit 202 is connected to the cassette 203 and pulled out together with the cassette 203 until the cassette holding unit 202 is pulled out to its maximum withdrawal position (see FIGS. 14 and 15). Cassette holder 20
After the cartridge 2 reaches the maximum withdrawal position, the cassette 203 can be pulled out alone. Conversely, at the time of pushing the cassette holding unit 202 and the cassette 203, the cassette 203 can be pushed alone until it reaches the cassette holding unit 202 located at the maximum withdrawal position. After reaching, it is connected to the cassette holding section 202 and is configured to be able to be pushed and moved with the cassette holding section 202. Such a cassette holding unit 202 and a cassette 203
The latch mechanism 233 is a structure that enables the connection with the latch mechanism 233.
Hereinafter, the latch mechanism 233 will be described.

A latch member 234 is attached to a rear portion of the cassette holding portion 202 so as to be rotatable around a substantially horizontal axis orthogonal to the pulling and pushing directions. The latch member 234 is moved in the first direction (F in FIGS. 10 to 15).
D), the first engaging portion 23 engages with an unillustrated engaging hole provided in the cassette 203.
5 and a second direction opposite to the first direction (FIGS. 10 to 1).
5, the second engaging portion 2 is engaged with an engaging hole (not shown) provided in the main body case 201 at the maximum withdrawal position of the cassette holding portion 202 by rotating the cassette holding portion 202.
36. Such a latch member 234 includes an abutting portion 237 arranged on the movement locus of the cassette 203. When the cassette 203 is pushed into the cassette holding section 202, the contact section 237
The rear portion 3 serves to rotate the latch member 234 in the first direction. That is, when the pressed cassette 203 comes into contact with the contact portion 237, the latch member 23
4 rotates in the first direction, the first engagement portion 235 engages with an engagement hole (not shown) provided in the cassette 203, and the cassette holding portion 202 and the cassette 203 are connected. . This state is shown in FIGS. Therefore, in a section where the cassette holding unit 202 reaches the maximum withdrawal position from the storage position, the cassette holding unit 202 and the cassette 203 are in a connected state. Further, the latch member 234 is urged in a second direction by an urging member (not shown). Thereby, the cassette holding unit 202
Reaches the maximum withdrawal position, the latch member 234 biased in the second direction rotates in the second direction, and the second engaging member Joint 236
The cassette holding unit 202 is
(See FIGS. 14 and 15).

Next, the main body case 201 has a cantilever unit 2 attached to the cassette 203 on its inner side wall.
Free end support 2 supporting the bottom of the 15 auxiliary metal plates 216
38. That is, the free end support portion 238 supports the free ends of the platen 207 and the label peeling plate 208 attached to the auxiliary sheet metal 216 by supporting the auxiliary sheet metal 216 directly supported.

In such a configuration, the electronic weighing apparatus 1 of the present embodiment measures the weight of the article placed on the weighing dish 3, prints the label on which the weighing result is printed by the printer 5, and issues the label. It is used to issue from the issuing port 101, to obtain the price of the article based on the weighed value of the article, print a receipt, and issue it from the issuing port 101.

In the printer 5, for example, when roll paper, which is thermal paper, is stored in the paper holding unit 206, predetermined items are printed on the roll paper by the line thermal head 204 and issued from the issuing port 101. . The issued printed roll paper can be cut by the cutter 205. Further, when roll paper-shaped label paper is stored in the paper holding unit 206, the backing portion is bent by the label peeling plate 208 and wound on the backing take-up shaft 209.
The printed label that has been separated from the mount by the label release plate 208 is issued from the issuing port 101.

Here, the operation of pulling out and pushing in the cassette 203 in the printer 5 for paper exchange work and maintenance work will be described. First, the body case 20
When the cassette 203 is pulled out from a state in which the cassette holding unit 202 is stored in the cassette holding unit 202 and the cassette 203 is stored in the cassette holding unit 202, the cassette 203 and the cassette holding unit 202 are connected by the latch mechanism 233. The holding section 202 is also pulled out of the main body case 201 along with the cassette 203. Cassette holder 2
02 is pulled out to the maximum withdrawal position, the latch mechanism 2
33 releases the connection between the cassette holding unit 202 and the cassette 203, so that the cassette 203 is pulled out from the cassette holding unit 202 while the cassette holding unit 202 is positioned at the maximum withdrawal position. At this time, when the cassette holding unit 202 is pulled out to the maximum pull-out position, the print head holder 221 is rotated by the jumping means 225, and the line thermal head 204 is jumped up. Moreover, the cassette 203 is provided with a platen 207, a label peeling plate 208, and a mount winding shaft 209 in a cantilever state, and the side of the cassette 203 facing the mounting wall 210, which cantilever them, is an open portion 211. I have. Then, the cassette 203 is
The paper holding unit 2 is pulled out or pulled out.
06, the roll winding shaft 20 via the platen 207 and the label release plate 208.
It is possible to easily carry out the work of setting the backing sheet on the mount 9 and the maintenance work of each part.

When the roll paper is set in the paper holding unit 206, the side fence 212 is slid to move the paper storage width of the paper holding unit 206 to the width of the roll paper to be actually used. Can be restricted.

In the state where the cassette holding section 202 is pulled out to the maximum drawing position, the line thermal head 20 is pulled out.
4 can be flipped up, and the cassette 203 can be pulled out and pushed alone, so that the force required at that time can be reduced. Thereby, a light operation feeling is obtained, and the operability at the time of pulling out and pushing the cassette 203 is improved.

Here, the latch mechanism 233 and the jumping means 2
Each of the elements 25 has a simple mechanical structure and realizes each function, so that the structure can be simplified.

The print head holder 221 is rotated by the jumping means 225 to rotate the line thermal head 204.
Is flipped up (FIGS. 3 to 5, 12 to 1).
5) The cutter 205 is urged by the coil spring SP together with the link member 226 so that the line thermal head 204
From the cutter 205.
Is covered with the cutter cover 231. As a result, even if the periphery of the line thermal head 204 is exposed to the outside due to the upward movement of the line thermal head 204 while being pulled out, an accident in which an operator's hand touches the cutter 205 carelessly is prevented, and safety is ensured. .

On the other hand, when the cassette 203 is pushed in, the state changes from the state shown in FIG. 11 to the state shown in FIG. As a result, a cam (not shown) provided on the back side of the cam 228 functions to abut the line thermal head 204 against the platen 207 by a cam action between the cam follower 229 and the cam. As a result, the line thermal head 204 abuts on the platen 207 with good balance, and the printing quality is maintained at a high quality.

The platen 207 and the label release plate 2
08 is attached to the cassette 203 in a cantilever state.
Of the free end support portion 23 through the auxiliary sheet metal 216.
8 supported. As a result, the platen 20 to which a force is applied by the rotational driving of the mount winding shaft 209 during printing.
7 and the label peeling plate 208 have sufficient rigidity. In particular,
Ensuring the support rigidity of the platen 207 helps to maintain high printing quality.

The gear train 217 provided on the cassette 203 is covered with a gear cover 218. As a result, the sharp portion of the gear train 217 does not touch the operator's hand, and safety is ensured.

[0047]

According to a first aspect of the present invention, there is provided a cassette type printer, comprising: a main body case; a cassette holding portion provided so as to be able to be pulled out with respect to the main body case; A print head holder rotatably supported about a substantially horizontal axis, and a print head attached to a free end of the print head, and a print head printed at a storage position where the cassette holding portion is stored in the main body case. A jumping-up means for rotating the print head holder so as to flip up the print head at a maximum withdrawal position where the cassette holding portion is pulled out from the main body case to a maximum extent; A cassette having a paper storage unit, which is provided so as to be able to be pulled out, and a cassette parallel to the rotation axis of the print head holder on the front side of the paper holding unit. A platen that is rotatably mounted on the cassette and faces the print head at the printing position when the cassette is stored in the cassette holding unit; and the maximum withdrawal position of the cassette holding unit from the storage position. A section that moves the cassette holding section and the cassette together, and a latch mechanism that releases the connection between the cassette holding section and the cassette when the cassette holding section is positioned at the maximum withdrawal position. A cutter holding mechanism provided in the print head holder for movably positioning a cutter having a fixed blade structure between a sheet cutting position downstream of the printing position in the sheet conveying direction and a retracted position retracted from the sheet cutting position. A mechanism and a cutter provided at the print head holder and exposing the cutter positioned at the paper cutting position and retracting the cutter. A cutter cover that covers the cutter positioned at the setting position, and when the cassette holding unit is located at the storage position, the cutter is positioned at the paper cutting position and the cassette holding unit is positioned at the maximum withdrawal position. Is provided with a cutter position control mechanism for positioning the cutter at the retracted position, so that the work of setting the roll paper on the paper holding unit and the maintenance work of each unit can be facilitated, and the operability can be improved. be able to. Further, when the print head is flipped up, the cutter can be positioned at the retracted position, and the cutter can be covered with the cutter cover at this position, so that the operator's hand can be protected from the cutter to maintain safety. it can.

According to a second aspect of the present invention, in the cassette type printer according to the first aspect, the cutter position control mechanism is formed by a cutter cam structure provided between the main body case and the cutter holding mechanism. Therefore, the cutter position control mechanism can be constituted only by a simple mechanical structure.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an example of application to an electronic weighing device as one embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the cassette and the cassette holding unit are both housed.

FIG. 3 is a perspective view showing a state where the cassette holding unit is pulled out to a maximum withdrawal position.

FIG. 4 is a perspective view showing a state where the cassette is further pulled out.

FIG. 5 is a perspective view showing a state where the cassette is pulled out.

FIG. 6 is a perspective view showing a right side surface of the cassette.

FIG. 7 is a perspective view showing a left side surface of the cassette.

FIG. 8 is a perspective view showing a right side of the cassette from which a cantilever unit for integrating a platen, a label peeling plate, and a mount winding shaft is removed.

FIG. 9 is a perspective view showing a left side surface of the cassette from which a cantilever unit for integrating a platen, a label peeling plate, and a mount winding shaft is removed.

FIG. 10 is a right side view showing a state where the cassette and the cassette holding unit are both housed.

FIG. 11 is a right side view showing a state where the cassette and the cassette holding portion are slightly pulled out.

FIG. 12 is a right side view illustrating a state in which the cassette and the cassette holding unit are further pulled out and the cutter is positioned at the retracted position.

FIG. 13 is a right side view showing a state where the cassette and the cassette holding portion are further pulled out.

FIG. 14 is a right side view illustrating a state where the cassette holding unit is pulled out to a maximum withdrawal position.

FIG. 15 is a right side view showing a state where the cassette is pulled out.

[Explanation of symbols]

 201 body case 202 cassette holder 203 cassette 204 print head (line thermal head) 205 cutter 206 paper holder 207 platen 221 print head holder 225 jumping means 228 cutter holding mechanism 231 cutter cover 230 cutter position control mechanism 233 latch mechanism

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) B41J 25/316 B41J 25/28 H 29/00 29/00 B B65H 35/06 F term (reference) 2C058 AB06 AC06 AC12 AC12 AD09 AE04 AE14 AF06 AF31 AF51 DA10 LA03 LA28 LB03 LB17 LB22 2C060 BA04 BA09 BB13 BC02 BC12 BC37 BC41 BC46 2C061 AP10 AQ04 AS06 BB11 CD03 CF04 CF06 2C064 CC02 CC06 CC11 EE01 EE15 3F052 AA01 DA05 BA02 BA25 CA25

Claims (2)

[Claims] 1. A main body case, a cassette holding portion provided so as to be able to be pulled out with respect to the main body case, and supported rotatably about a substantially horizontal axis orthogonal to the drawing direction with respect to the cassette holding portion. A print head holder having a print head attached to a free end thereof; and a print head positioned at a print position in a storage position where the cassette holding section is stored in the main body case, wherein the cassette holding section is provided in the main body case. At the maximum pull-out position where the print head is pulled out to the maximum, a jumping-up means for rotating the print head holder so as to flip up the print head is provided so as to be able to be pulled out from the cassette holding portion,
A cassette having a paper storage unit, and a cassette which is attached to the cassette so as to be rotatable around an axis parallel to a rotation axis of the print head holder on a front side of the paper storage unit, and wherein the cassette is stored in the cassette storage unit. In this state, the platen facing the print head at the printing position, and the cassette holding unit and the cassette are connected in a section until the cassette holding unit moves from the storage position to the maximum withdrawal position. A latch mechanism for releasing the connection between the cassette holding unit and the cassette when the holding unit is positioned at the maximum pull-out position; a sheet cutting position downstream of the printing position in the sheet conveying direction from the printing position; Cutter holding provided in the print head holder for movably positioning a cutter having a fixed blade structure between the retracted position and the retracted position. And a cutter cover provided on the print head holder and exposing the cutter positioned at the paper cutting position to cover the cutter positioned at the retracted position; and when the cassette holding unit is positioned at the storage position. And a cutter position control mechanism that positions the cutter at the paper cutting position and positions the cutter at the retracted position when the cassette holding unit is at the maximum withdrawal position. 2. The cassette type printer according to claim 1, wherein said cutter position control mechanism is formed by a cutter cam structure provided between said main body case and said cutter holding mechanism.