JP2001130800A - Structure of preventing catch in sheet material conveying mechanism, and printer having the structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material conveying mechanism that can prevent chatch even when using a sheet material with its adhesive layer exposed. SOLUTION: In the sheet material conveying mechanism, the sheet material having the self-adhesive layer on one surface of its base material is contacted to a roller, and the roller is rotated and conveyed. A guide roller 3 forming a local abutting portion comprising projection strips 20 continuing circumferentially on its outer peripheral surface is arranged near the downstream of the roller, and the local abutting portion is contacted to the self-adhesive later of the sheet material fed out of the roller and guides the sheet material downstream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing entanglement in a sheet conveying mechanism for conveying a band-shaped sheet having an adhesive layer on one surface of a base material, and printing such as a label printer having the entanglement preventing structure. The apparatus is particularly suitable when a sheet material having a strong pressure-sensitive adhesive layer is used.

[0002]

2. Description of the Related Art In a conventional printing apparatus, a pressure-sensitive adhesive layer of a pressure-sensitive adhesive label having a pressure-sensitive adhesive layer on one side of a base material such as paper or film is attached to a release-treated layer of a strip-shaped release material subjected to a release treatment. A recording head records predetermined characters and images on the surface of the adhesive label while transporting the strip-shaped release material with the adhesive label sandwiched between rollers, and peels off the recorded adhesive label from the release material to produce products, etc. Is generally applied to an object. In the printing apparatus having such a configuration, since the release material covers the entire surface of the pressure-sensitive adhesive layer, even if a sheet material transport mechanism that transports the strip-shaped release material with the adhesive label between the rollers is a major problem. Did not occur.

[0003]

However, when the release material with the pressure-sensitive adhesive label is used, the release material remains as dust and the process is troublesome. Therefore, it is conceivable to use an adhesive label to which no release material is attached. However, if a band-shaped adhesive label to which no release material is attached as shown in FIG. 2 is used, the adhesive layer comes into contact with the surface of the roller. The trouble that the adhesive label is involved is easily generated. In particular, in a printing apparatus using an adhesive label to which no release material is attached, a cutter mechanism for cutting the front end of the adhesive label on which characters and the like are recorded is arranged downstream of the platen roller, and the cut portion of the cutter mechanism is covered. While the paper is conveyed to the body, the new adhesive label tip after the cutting position is temporarily retracted to the printing start position of the platen roller, and then the next printing is performed while being advanced. A trouble in which the leading end is caught in the platen roller easily occurs. And it is remarkable when the original sheet roll of the pressure-sensitive adhesive label has a strong winding habit. Further, when the sheet material on which printing has been completed is cut to a predetermined length by a downstream cutter, if a curl remains or warpage occurs due to the pressing force of various rollers that have been passed up to that point, the cutter is moved to a predetermined length. Trouble that cannot be sent to the position may occur. In particular, when a sheet material receives heat during printing by a thermal transfer printer or the like, warpage is likely to occur.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and has as its object to provide a sheet conveying mechanism which can prevent entanglement even when a sheet having an adhesive layer exposed on one surface of a substrate is used. An object of the present invention is to provide a entanglement preventing structure and a printing apparatus having the entanglement preventing structure.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object. A sheet material having an adhesive layer on one surface of a substrate is brought into contact with a roller, and the roller is conveyed by rotating the roller. And a guide roller having a locally abutting portion locally protruding on an outer peripheral surface thereof is provided in the vicinity of the downstream side of the roller, and an adhesive of the sheet material sent out from the roller is provided. A roll-up prevention structure in a sheet material transport mechanism, characterized in that the local contact portion is brought into contact with an agent layer and guided downstream. With such a structure, it is possible to prevent the sheet material to which the pressure-sensitive adhesive is applied and the pressure-sensitive adhesive layer is exposed from being caught in the conveyance.

[0006] The present invention may be configured such that the local contact portion protrudes continuously in the circumferential direction.

The present invention further provides a platen roller functioning as a roller, a recording head provided toward the platen roller, and the local contact portion disposed near the downstream side of the platen roller and locally protruding. And a cutter mechanism provided downstream of the guide roller. The platen roller and the recording head remove the leading end of the sheet material that has been cut by the cutter mechanism. And recording by the recording head while being conveyed to the downstream side, and by contacting the local contact portion with the adhesive layer of the recorded sheet material sent out from the platen roller to the cutter mechanism side The feature is to guide. With such a configuration, the pressure-sensitive adhesive sheet can be sent to the adherend without being wound around a platen roller or the like even with a band-shaped pressure-sensitive adhesive sheet having a curl by a material roll or the like.

[0008] Between the platen roller and the cutter mechanism, on the opposite side of the guide roller with respect to the sheet material pass line, the distance between the pass line and the pass line is from upstream to downstream. By providing a guide member having a gradually narrowing guide surface, even if the sheet material has a curl or warpage, the leading end of the sheet material can be stably fed to a predetermined position of the cutter mechanism,
Cutting errors can be prevented. The pass line is a position where the sheet material is sandwiched between the recording head and the platen roller to be printed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a printing apparatus 1 having an entrainment preventing structure. FIG. 2 is an enlarged cross-sectional view of a sheet material (hereinafter, referred to as a belt-shaped sheet) 2 having an adhesive layer on one surface of a base material. FIG. 4 is a perspective view of a guide roller 3 </ b> A which is a main member of the entanglement preventing structure 3.

As shown in FIG. 1, a schematic configuration of a printing apparatus 1 according to the present embodiment is configured such that a thermal transfer type recording head 5 is applied to one surface of a belt-shaped sheet 2 having an adhesive layer fed from an unwinding roll 4. A predetermined character or the like is printed, and after printing, a predetermined portion is cut by the cutter mechanism 6. As shown in FIG. 2, the strip-shaped sheet 2 used in the printing apparatus 1 has a release agent layer C made of silicon resin or the like formed on one surface of a base material A such as paper or a synthetic resin film. A pressure-sensitive adhesive layer B is formed on the other surface of the base material A, and the pressure-sensitive adhesive layer B
Is wound in a state of facing inward to form the unwinding roll 4. The release agent layer C has been subjected to a surface treatment capable of printing by thermal transfer (hereinafter referred to as a thermal transfer layer).

Next, the configuration of the printing apparatus 1 will be described. First, the sheet material transport mechanism 7 for the belt-shaped sheet 2 will be mainly described. As shown in FIG. 1, an unwinding roll support shaft 14 for setting the unwinding roll 4 of the strip-shaped sheet 2 is provided on a side surface of a housing 13. A pair of upper and lower feeding rollers 15a and a nip roller 15b are provided on the left side of the unwinding roll support shaft 14 in the drawing, and a platen roller 16 serving as a main roller is provided downstream of the feeding rollers 15a and the nip roller 15b. Platen roller 16
The recording head 5 is provided so as to be able to move up and down, and a cutter mechanism 6 is provided downstream of the platen roller 16.
A guide roller 3A is provided, and idler rollers 17 and 17 are provided in the vicinity of the feeding roller 15a and the nip roller 15b, and on the upstream and downstream sides, respectively. Further, the auxiliary guide roller 3B is provided in the vicinity of the upstream side of the platen roller 16. Provide.

For example, each roller of the platen roller 16 or the feed roller 15a with which the pressure-sensitive adhesive layer B of the belt-shaped sheet 2 comes into contact is made of silicone rubber having excellent peelability so that the pressure-sensitive adhesive of the pressure-sensitive adhesive layer B does not adhere. Belt-like sheet 2
Has been treated so that the pressure-sensitive adhesive is easily peeled off and a part of the pressure-sensitive adhesive does not adhere. The rollers 16 and 15a may be made of another material as long as an equivalent peeling effect is obtained, or may be a roller coated with a release agent such as a silicone resin.

The guide roller 3A provided on the downstream side of the recording head 5 is locally protruded because the cutting edge of the strip-shaped sheet 2 cut by the cutter mechanism 6 comes into contact and the adhesive is frequently in direct contact. A ridge 20 (local contact portion) is formed on the outer peripheral surface. For example, the guide roller 3A shown in FIG. 3 is formed in a shape in which ridges 20 are formed by stacking abacus balls continuous in the circumferential direction. A material made of ethylene fluoride) is used. In addition,
Although the number of the ridges 20 is four in the embodiment shown in FIG. 3, it is not limited to this and can be set as appropriate.

A stepping motor 21 and a nip air cylinder 22 are provided inside the housing 13. A pulley 23 attached to an output shaft of the stepping motor 21 is driven by a driven shaft 24, a shaft 25 of a feeding roller 15 a, and a platen roller 16. The timing belt 26 is stretched between the pulleys provided on the shafts 15 of the first and second shafts 15, respectively, so that the feeding roller 15a and the platen roller 16 can rotate. Further, the nip roller 15b is provided at one end, and the other end of the lever 31 that swings around the support shaft 30 is connected to the nip roller 15b vertical air cylinder 22 and the spring 32.

Accordingly, the leading end of the belt-shaped sheet 2 set on the unwinding roll 14 is passed from the upstream idler roller 17 to between the feed roller 15a and the nip roller 15b, and then the downstream idler roller 17, the auxiliary guide roller When the sheet is guided and set between the platen roller 16 and the recording head 5 over 3B, the preparation of the belt-shaped sheet 2 is completed. Then, a switch such as a start push button of the control panel 62 is turned on, and a nip roller 15b is lowered by a print command of an adherend conveyed by a conveyer (not shown), so that the feed roller 15a and the nip roller 15b are moved.
The belt-like sheet 2 is sandwiched between the stepping motors 21.
Is driven, the band-shaped sheet 2 can be fed out from the unwinding roll 4, and while the fed-out band-shaped sheet 2 is guided by the idler roller 17 and the auxiliary guide roller 3B, the recording head 5 is lowered by the printing command and the target product is lowered. Can be printed. Then, the leading end of the band-shaped sheet 2 on which the recording is completed is fixed to the ridge 20 of the guide roller 3A.
In the state where they are in line contact with each other, they are guided and conveyed to the cutter mechanism 6 while preventing entanglement, and cut by the cutter mechanism 6 to form one label 2A. The action of preventing the guide roller 3A from getting caught will be described later. Further, the auxiliary guide roller 3B may have the same configuration as the guide roller 3A.

The cutter mechanism 6 may have any configuration as long as it can cut the belt-shaped sheet 2 at a predetermined position. In this embodiment, the cutter roll 33 having teeth is rotated by a motor (not shown). Thus, a configuration is employed in which the belt-shaped sheet 2 is cut at a predetermined position.

Next, the configuration related to the recording head 5 will be described. The recording head 5 is a line head in which a plurality of heating elements are arranged in a row in the width direction of the belt-shaped sheet 2, that is, in a direction orthogonal to the conveying direction. It is attached downward to the tip portion together with the ribbon guide 42. The head support arm 41 that supports the recording head 5 is provided in the housing 1.
3. An air cylinder 46 for locking a lower end circular engaging portion 45 of a lever 44 pivoting about a support shaft 43 extending inside the central portion, and for vertically operating the recording head 5 above the lever 44. A spring 47 is connected. Accordingly, when the air pressure of the air cylinder 46 is released (OFF), the recording head 5 causes the lever 44 to be tilted about the support shaft 43 in the direction of the spring 47 by the urging of the spring 47 so that the engagement portion 45 is moved. When the recording head 5 descends with the support shaft 40 as a fulcrum and presses on the platen roller 16, on the other hand, when air pressure is supplied (ON) to the air cylinder 46 by a signal, the lever 44 is moved to the spring 4.
By pushing the recording head 5 away from the platen roller 16, the recording head 5 can be raised and separated from the platen roller 16. Note that the pressing force of the recording head 5 against the platen roller 16 can be appropriately adjusted according to the pressure applied to the belt-shaped sheet 2 of the recording head 5.

Above the recording head 5, a supply side ink ribbon shaft 50 and a take-up side ink ribbon shaft 51 are provided side by side. A ribbon break detector 52 is provided below the supply side ink ribbon shaft 50 and below the supply side ink ribbon shaft 50. A timing belt 54 is provided between a pulley 53 attached to the take-up side ink ribbon shaft 51 and a pulley (not shown) of the shaft 15 of the platen roller 16. The take-up side ink ribbon shaft 51 is configured to be rotationally driven. Then, a roll around which the ink ribbon 55 is wound is set on the supply-side ink ribbon shaft 50, and the fed ink ribbon 55 is passed through the ribbon break detector 52, and the ribbon tension mechanism 5
6. Further, the ribbon guide 4 guides the recording head 5 to the lower surface thereof.
When the ink ribbon 55 is wound around the winding-side ink ribbon shaft 51 from Step 2, the setting of the ink ribbon 55 is completed.

Next, the operation of the printing apparatus 1 having the above configuration will be described. The operation of preparing the belt-shaped sheet 2 and the ink ribbon 55 has already been described, and will be omitted. When an adherend conveyed by a conveyor (not shown) provided in addition to the printing apparatus 1 of the present apparatus is supplied to the printing apparatus 1, the housing 6 of the label transfer apparatus 60 provided in advance in the printing apparatus 1 is provided.
When the apparatus is started by operating an operation button (not shown) of the control panel 62 provided in the step 1, the stepping motor 21 is operated, the strip-shaped sheet 2 is sent out from the unwinding roll 4, and the leading end of the strip-shaped sheet 2 is recorded. Since the head 5 is located at a predetermined position in advance, the head 5 is timingd with the adherend based on a signal from an adherend position detector (not shown) provided on the adherend transport conveyor. Vertical air cylinder 46
Heats the recording head 5 at the same time as it descends,
A predetermined print is applied to the belt-like sheet 2 via the reference numeral 5. In other words, the stepping motor 21 rotates forward by the adherend detection signal, and the belt-like sheet 2 sandwiched between the platen roller 16 and the recording head 5 is supplied to the downstream side, and is taken up by the rotation of the platen roller 16. Since the side ink ribbon shaft 51 rotates, the ink ribbon 55 moves together with the belt-shaped sheet 2 while being in contact with the lower surface of the recording head 5. Then, in this state, the recording head 5 descends, and the recording head 5 is heated by the print signal, and the ink ribbon 55 is heated.
At the same time, the ink is transferred to the thermal transfer layer on the release agent layer C side of the belt-shaped sheet 2 and printed.

When a predetermined length (one feed pitch) is moved to the belt-like sheet 2 and a predetermined printing is completed, the recording head 5 is raised by the operation of the cylinder 46 and the spring 47 to stop the printing. But stepping motor 2
1 continuously rotates to transfer the rear end of the belt-shaped sheet 2, that is, the printing end portion, to the cutter mechanism 6. Then, when the rear end of the printing end portion reaches a predetermined position, the motor of the cutter mechanism 6 rotates the cutter roller 33 to cut the rear end of the printing of the belt-shaped sheet 2 to form the label 2A. . The label 2A is conveyed onto an adherend such as a product conveyed by a conveyor (not shown) while being adsorbed on the lower surface of the suction belt conveyor 63 of the label conveyor 60 provided on the downstream side, and is pressed by a press roll 64.
To adhere to the surface of the adherend.

On the other hand, the band-shaped sheet 2 remaining after being cut by the cutter mechanism 6 moves backward until the cutting edge, that is, the leading end of the band-shaped sheet 2 reaches a predetermined position of the recording head 5. Then, when the leading end of the belt-shaped sheet 2 is located at a predetermined position, the recording head 5 is lowered and heated by the print signal of the adherend transport conveyor, and the ink ribbon 55 is heated to the predetermined position, as described above. The next printing is performed.

As described above, in the platen roller 16, the leading end of the belt-shaped sheet 2 repeatedly rotates forward and backward in accordance with the flow of the adherend. When the adherend is continuously supplied, the belt-shaped sheet 2 is also continuously supplied corresponding to the adherend. Conventionally, when the leading end of the cut strip-shaped sheet 2 is sent out from the platen roller 16, a trouble that the cut adhesive of the pressure-sensitive adhesive layer B adheres to the platen roller 16 and gets caught in the platen roller 16 tends to occur. However, in the present embodiment, the entanglement preventing structure 3 for the guide roller 3A having the ridge 20 is disposed near the downstream side of the platen roller 16, so that the belt-like shape that moves forward by the action of the guide roller 3A is provided. Sheet 2
Is smoothly guided to the cutter mechanism 6 side, so that the entanglement can be prevented.

That is, on the outer peripheral surface of the guide roller 3A in the entanglement preventing structure 3, a ridge 20 continuous in the circumferential direction is provided.
Are projected, and the ridge 20 makes line contact with the pressure-sensitive adhesive layer B, so that the contact area can be greatly reduced. Further, since the contact of the ridge 20 is along the traveling direction of the belt-shaped sheet 2, the pressure-sensitive adhesive layer B is not agitated, and since the surface of the ridge 20 is made of polytetrafluoroethylene, a material having high releasability is used. Since it is formed, the leading end of the belt-shaped sheet 2 is guided by the guide roller 3 </ b> A and moves smoothly toward the cutter mechanism 6 on the downstream side without being caught by the platen roller 16. Of course, the material of the guide roller 3A may be a silicon material or any other material having releasability other than those described above. Further, the protrusions 20 of the guide roller 3A are not limited to those formed adjacently at a short pitch. For example, in the second embodiment of the guide roller 3 </ b> A shown in FIG. 4, a plurality of bosses 35 of the ridge 20 are fixed to the shaft 34 at predetermined intervals, and the bosses 35 One ridge 20 is formed. A guide member 36 for guiding the leading end of the belt-shaped sheet 2 to a predetermined position of the cutter mechanism 6 faces between the boss portions 35.

The guide member 36 is located between the platen roller 16 and the cutter mechanism 6 and on the opposite side to the guide roller 3A with the pass line PL of the belt-shaped sheet 2 therebetween, and the distance between the guide line 3 and the pass line PL is upstream. It has a guide surface that gradually narrows from the side to the downstream side (from left to right in FIG. 5). The guide member 36 shown in FIG. 4 and FIG.
A plurality of tongue pieces are formed by bending a metal plate, and are spaced apart from one side of the elongated base portion 37 screwed to the upper surface of the recording head 5 at a wider interval than the boss portion 35 of the ridge 20. It is extended in a shape. The lower surface of the guide member 36 functioning as a guide surface is provided at the base portion 3 at the base end.
7 extends obliquely downward at a steep angle, and when approaching the pass line PL, the inclination is relaxed and extends toward the downstream side, and the tip portion is close to the cutting blade of the cutter roll 33.

When the guide member 36 having such a configuration is provided, even if the belt-like sheet 2 delivered from the platen roller 16 has a curl remaining or warps and the leading end portion is curved upward, the belt-like sheet 2 can be formed. The tip of the material 2 abuts on the guide surface of the guide member 36 to prevent the bending. The interval between the guide surface and the pass line PL is set so that the interval becomes narrower toward the downstream side. Approaching PL, cutter roll 3
3 is located on the pass line PL, and the leading end of the belt-shaped sheet 2 is stably guided by the cutter roll 33, so that the trailing edge of the printing end portion of the belt-shaped sheet 2 can be cut smoothly. . The guide member 36 of the present embodiment
Is formed by bending a metal plate, but the material is not particularly limited as long as the same effect can be obtained by processing another member such as a resin material.

Incidentally, the local contact portion of the present invention is not limited to the ridge 20 which is continuous in the circumferential direction. For example, the local contact portion is constituted by a plurality of protrusions formed of a smooth surface of a material having releasability. Alternatively, the contact area may be reduced by compressed air (compressed gas) discharged from the small holes.

FIG. 6 shows a third embodiment of the local contact portion of the guide roller of the present invention. This guide roller 101
Is a hollow shaft 101a and a thin ring-shaped protrusion 102 formed to have a diameter larger than the diameter of the hollow shaft 101a.
And A plurality of small holes (air discharge holes) 103 are formed in the circumferential direction on the narrow outer peripheral surface 102a of the protruding portion 102 functioning as a local contact portion. This small hole 103
It is provided in a state of communicating with the internal space of the hollow shaft 101a.
The plurality of protrusions 102 are formed on the hollow shaft 101a so as to be separated from each other in the axial direction.

In the guide roller 101, when the apparatus is used, compressed air from a compressed air generator (not shown) is supplied to the internal space of the hollow shaft 101a. Since the supplied compressed air is discharged from the small holes 103 of the protruding portion 102, it is possible to minimize the contact between the pressure-sensitive adhesive layer B of the belt-shaped sheet 2 and the outer peripheral surface 102a of the protruding portion 102. This makes it possible to prevent the adhesive substance constituting the pressure-sensitive adhesive layer B from adhering to the protruding portion 102 and to prevent glue from remaining. Then, the belt-shaped sheet 2 is guided downstream without being caught by the platen roller 16. The guide roller 101 is rotated by a rotation driving mechanism (not shown) at substantially the same peripheral speed as the supply speed of the belt-shaped sheet 2.

In each of the above embodiments, the recording head 5 of the thermal transfer type has been described as an example. However, the recording head 5 is not limited to this. For example, the recording head 5 of an ink jet type may be used.

Further, the entanglement preventing structure 3 of the sheet material transport mechanism 10 can be used by being incorporated not only in the printing apparatus 1 but also in a device for transporting a sheet material having an adhesive layer B on its surface.

[0031]

As described above, according to the present invention, a guide roller having a locally abutting portion formed on the outer peripheral surface is provided near the downstream side of the roller, and the guide roller is sent out from the roller. Since the local contact portion is brought into contact with the pressure-sensitive adhesive layer of the sheet material and guided to the downstream side, the contact area between the pressure-sensitive adhesive layer of the sheet material and the guide roller can be significantly reduced. It can be prevented from being caught in the roller.

Further, since the local contact portion projects continuously in the circumferential direction, the local contact portion comes into line contact with the pressure-sensitive adhesive layer of the sheet material, thereby greatly reducing the contact area. be able to. In addition, since the contact of the local contact portion is along the traveling direction of the sheet material, the pressure-sensitive adhesive layer is not scratched. Therefore, the leading end of the sheet material is guided by the guide roller, and moves more smoothly toward the downstream side without being caught by the roller.

Further, a platen roller functioning as a roller, a recording head provided toward the platen roller, and a locally abutting portion, which is disposed near the downstream side of the platen roller and protrudes locally, is formed on the outer peripheral surface. And a cutter mechanism provided on the downstream side of the guide roller, so that the leading end of the remaining sheet material cut by the cutter mechanism is passed through the platen roller and the recording head and returned to the printing position of the recording head. Even so, the local contact portion locally contacts the pressure-sensitive adhesive layer of the recorded sheet material sent from the platen roller, so that the leading end of the sheet material can be prevented from being caught in the platen roller.

Further, between the platen roller and the cutter mechanism, on the opposite side to the guide roller with the sheet material pass line interposed therebetween, the distance from the pass line gradually decreases from the upstream side to the downstream side. Since the guide member having the guide surface is provided, the leading end of the sheet material fed from the platen roller can be guided by the guide member and smoothly fed to a predetermined position of the cutter mechanism. Therefore, a cutting error can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a printing apparatus.

FIG. 2 is an enlarged sectional view of a sheet material.

FIG. 3 is a perspective view of a guide roller according to the first embodiment.

FIG. 4 is a plan view of a portion provided with a guide member.

FIG. 5 is a side view of a portion provided with a guide member.

FIG. 6 is a perspective view of a guide roller according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 printing device 2 belt-shaped sheet 3 winding prevention structure 3A guide roller 3B auxiliary guide roller 4 unwinding roll 5 recording head 6 cutter mechanism 7 sheet material transporting mechanism 13 housing 14 unwinding roll support shaft 15 axis 15a unwinding roller 15b nip roller 16 Platen roller 17 Idling roller 20 Ridge (local contact portion) 21 Stepping motor 22 Nip air cylinder 23 Pulley 24 Follower shaft 25 Shaft 26 Timing belt 30 Support shaft 31 Lever 32 Spring 33 Cutter roll 34 Shaft 35 Boss 36 Guide Member 37 Base part 40 Support shaft 41 Head support arm 42 Ribbon guide 43 Support shaft 44 Lever 45 Engagement part 46 Air cylinder 47 Spring 50 Supply side ink ribbon shaft 51 Winding side ink ribbon shaft 52 Bont detector 53 Pulley 54 Timing belt 55 Ink ribbon 56 Ribbon tension mechanism 60 Label transport device 61 Housing 62 Control panel 63 Suction belt conveyor 64 Press roll 101 Guide roller 101a Hollow shaft 102 Projection 102a Outer surface (local contact portion) 103 Small holes (air discharge holes) A Base material B Adhesive layer C Release agent layer PL Pass line

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[Procedure amendment]

[Submission date] December 24, 1999 (1999.12.
24)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (4)

[Claims] 1. A sheet material transport mechanism for bringing a sheet material having an adhesive layer on one surface of a base material into contact with a roller, rotating the roller, and transporting the sheet material. A guide roller having a projecting local contact portion formed on the outer peripheral surface is provided, and the local contact portion is brought into contact with the pressure-sensitive adhesive layer of the sheet material sent out from the roller and guided downstream. Entrapment prevention structure in the sheet material transport mechanism. 2. The entanglement preventing structure in a sheet material conveying mechanism according to claim 1, wherein the local contact portion projects continuously in a circumferential direction. 3. A platen roller functioning as a roller; a recording head provided toward the platen roller; and a local contact portion disposed near the downstream side of the platen roller and locally protruding. A guide mechanism formed downstream of the guide roller;
Recording by the recording head while conveying the leading end of the sheet material remaining after cutting by the cutter mechanism to the downstream side between the platen roller and the recording head, and sending out from the platen roller. A printing device provided with an entrainment preventing structure, wherein the local contact portion is brought into contact with the recorded pressure-sensitive adhesive layer of the sheet material and guided toward the cutter mechanism. 4. A space between the platen roller and the cutter mechanism, on the opposite side of the guide roller with respect to the sheet material pass line, and a distance from the pass line from the upstream side to the downstream side. 4. The printing apparatus according to claim 3, further comprising a guide member having a guide surface that gradually narrows.