JP4400175B2 - Opening / closing lid braking mechanism and printer - Google Patents

Description

  The present invention relates to a braking mechanism that applies a braking force so that an opening / closing lid that opens and closes a roll paper storage portion of a roll paper printer does not open and close vigorously.

  An opening / closing lid attached to an electronic device such as a printer is provided with a braking mechanism for preventing it from opening and closing vigorously. As a braking mechanism, one having a structure in which a braking force is applied to the hinge portion of the opening / closing lid by a frictional force generated using the spring force of the coil spring (Patent Documents 1 and 2), or a predetermined amount on the hinge portion of the opening / closing lid A curved sliding surface is formed, and a braking force is applied to the hinge portion of the opening / closing lid by using a dynamic friction force generated between the sliding surface and a friction sliding portion sliding along the sliding surface. (Patent Document 3) and the like are known.

Further, in general, a lock mechanism for locking the open / close lid in the closed position is provided so that the open / close lid does not open carelessly. For example, in the case of an open / close lid for opening and closing the roll paper storage section of a roll paper printer, a latch pin on the open / close lid side is engaged with a latch pin attached to the printer body side so that a locked state is formed. It has become. The latch claws are generally arranged on both sides of the opening / closing lid so that the opening / closing lid does not rattle in the locked state.
Japanese Patent Application Laid-Open No. 11-354941 JP 2003-56545 A Japanese Patent Laid-Open No. 10-252740

  Here, when the braking force acting on the opening / closing lid is increased, the opening / closing lid opens and closes at a slow speed, so that it is possible to reliably prevent a large impact force from acting on the opening / closing lid when the opening / closing lid is opened / closed. However, if the opening / closing speed is slow, when the operator presses the opening / closing lid when closing and locking the opening / closing lid, the opening / closing lid is deformed, and one of the latch claws on both sides is first engaged with the latch pin, There is a risk that the latching claw will be in a single-closed state where it remains in an unengaged state. That is, the operator may press the center of the opening / closing lid and the left and right latch claws should engage with the latch pin at the same time. Is expensive.

  On the other hand, a roll paper printer or the like may be used in a horizontal position on a horizontal surface such as a cash register counter or may be used in a vertical position on a wall surface. When used in a vertically placed state, the opening / closing lid is installed in a state of opening and closing up and down around its lower end side. In this case, when the opening / closing lid is opened, the opening / closing lid is vigorously opened due to the weight of the opening / closing lid. Therefore, it is necessary to increase the braking force as compared with the case where the lid is used in the horizontal position. However, when the braking force is increased, the possibility of falling into the above-mentioned one-sided state increases.

  An object of the present invention is to propose a braking mechanism for an opening / closing lid that can simultaneously eliminate the adverse effects of when the braking force of the opening / closing lid is large and small.

  The present invention relates to an opening / closing lid that rotates between a closed position and an open position about a support shaft supported by the casing and applies a braking force to the rotation of the opening / closing lid that can be locked to the closed position by a lock mechanism. A braking mechanism, a cam member attached to the opening / closing lid, a cam follower swingable about a swinging shaft supported by the housing, and a predetermined friction against the swinging motion of the cam follower A friction member imparting a resistance force, and the cam member includes a cam surface on which the cam follower can slide as the opening / closing lid rotates, and the cam surface includes the opening / closing lid. A first cam surface region in which the swing amount of the cam follower is small with respect to the rotation amount of the first and second cam surface regions, and a second cam surface region in which the swing amount of the cam follower with respect to the rotation amount of the opening / closing lid is larger than the first cam surface region. The lock machine The cam follower slides on the second cam surface area until the opening / closing lid released by the lock is rotated to the open position, and the opening / closing lid starts the locking operation by the locking mechanism. From the position to the closed position, the cam follower slides on the first cam surface area.

  In the braking mechanism of the present invention, the swing amount of the cam follower that swings with a predetermined frictional resistance is larger than the pivot amount of the open / close lid until the open / close lid is unlocked and reaches the open position. Therefore, when the opening / closing lid is opened, a large braking force is applied, so that the unlocked opening / closing lid does not open vigorously. On the other hand, when locking the opening / closing lid, since the swing amount of the cam follower is small relative to the rotation amount of the opening / closing lid, the braking force acting on the opening / closing lid is small. Therefore, when the opening / closing lid is pushed in to lock the opening / closing lid, it is possible to avoid the adverse effect that the opening / closing lid whose movement is restricted by a large braking force is deformed and falls into a single-closed state.

  Here, it is desirable to apply a large braking force so that the open / close lid does not close vigorously even when the open / close lid is closed to a position where locking by the lock mechanism starts. For this purpose, a third cam surface region in which the swing amount of the cam follower is larger than the first cam region with respect to the rotation amount of the opening / closing lid is formed on the cam surface, and the opening / closing lid is opened. The cam follower may be configured to slide on the third cam surface area from the position to the position where the locking operation by the locking mechanism starts.

  Next, with the open / close lid attached to a printer or the like, even if the open / close lid does not require a braking mechanism when it is in the horizontal orientation, its own weight acts when opening the open / close lid in the vertical orientation. Therefore, it is necessary to attach a braking mechanism to the opening / closing lid. In order to cope with the case where the necessity of the braking mechanism is required according to such a usage pattern, it is desirable that the braking mechanism is detachable.

  That is, the braking mechanism includes a braking unit that is detachably attached to the housing, and the cam member that is detachably attached to the opening / closing lid, and the braking unit includes the cam follower, What is necessary is just to set it as the structure provided with the rocking | fluctuation shaft and the said friction member.

  A plurality of disc springs can be used as the friction member used as the braking force generation source. In this case, the braking unit includes a unit frame attached to the housing and a swing arm that supports the cam follower at the tip, and the screw arm is formed with a screw hole. Fastened to the unit frame through the center hole of the disc spring and the screw hole of the swing arm as the swing shaft. A screw may be used. A predetermined frictional force is obtained by pressing the disc spring against the base end portion of the swing arm from the side by the fastening screw.

  Next, the present invention relates to a printer, and is characterized in that a brake mechanism having the above-described configuration is attached to an opening / closing lid provided therein.

  In addition, when the printer includes a storage unit that stores the recording paper roll and includes an opening / closing lid attached to the opening of the storage unit, the braking mechanism of the present invention is applied as a braking mechanism for the opening / closing lid. be able to.

  In the braking mechanism of the present invention, the swing amount of the cam follower that swings with a predetermined frictional resistance is larger than the pivot amount of the open / close lid until the open / close lid is unlocked and reaches the open position. Therefore, when the opening / closing lid is opened, a large braking force is applied, so that the unlocked opening / closing lid does not open vigorously. On the other hand, when locking the opening / closing lid, since the swing amount of the cam follower is small relative to the rotation amount of the opening / closing lid, the braking force acting on the opening / closing lid is small. Therefore, when the opening / closing lid is pushed in to lock the opening / closing lid, it is possible to avoid the adverse effect that the opening / closing lid whose movement is restricted by a large braking force is deformed and falls into a single-closed state. Therefore, according to the present invention, it is possible to realize an opening / closing lid braking mechanism that can simultaneously eliminate the adverse effects of when the opening / closing lid braking force is large and small.

  In addition, if a configuration in which the braking mechanism is attached in a detachable state is employed, whether the braking mechanism is necessary or not is required depending on the usage pattern, as in the case of an open / close lid of a printer used in a vertically installed state. Can deal with cases.

  Hereinafter, a braking mechanism for an opening / closing lid to which the present invention is applied will be described with reference to the drawings.

  Prior to the description of the braking mechanism, a printer including an opening / closing lid to which the braking mechanism of the present invention can be applied will be described with reference to FIGS.

  FIG. 1 is an external perspective view of the printer, FIG. 2 is a schematic longitudinal sectional view thereof, and FIG. 3 is a schematic longitudinal sectional view of the printer with the opening / closing lid opened. The printer 1 includes a rectangular frame-like case main body 2 that covers the four side surfaces of the printer 1, an opening / closing lid 3 that covers a front portion of the upper surface of the printer, and an opening / closing lid 4 that covers a rear portion, thereby forming a printer case. . A printer unit 11 is built in the printer case, and a recording paper discharge port 5 is formed between the opening / closing lids 3 and 4. When the slide button 6 is operated, the locking mechanism (see FIGS. 6 and 7) of the rear opening / closing lid 4 is released and can be opened as shown in FIG. When the opening / closing lid 4 is opened, the storage section 8 for the recording paper roll 7 in the printer unit 11 is exposed, and the recording paper roll 7 can be replaced. When the front opening / closing lid 3 is opened, the ribbon cassette mounting portion 10 for detachably mounting the ribbon cassette 9 of the ink ribbon of the printer unit 11 is exposed so that the ribbon cassette 9 can be replaced.

  A storage portion 8 for a recording paper roll 7 having a substantially arc-shaped bottom surface opened upward when viewed from the side is formed in a rear portion of the printer unit 11. The recording paper 7 a drawn out from the recording paper roll 7 stored here is guided to the recording paper conveyance path 15 via the guide roller 14 disposed at the front end portion of the storage unit 8. The recording paper conveyance path 15 includes a conveyance path portion 16 slightly inclined upward toward the front, a front inclination path portion 17 rising from the front end of the conveyance path portion 16 at a large inclination angle, A rear ramp portion 18 that is inclined rearward from the upper end of the front ramp portion 17 and connected to the recording paper discharge port 5 is provided. In FIG. 2, the recording paper 7a is indicated by a two-dot chain line.

  The conveyance path portion 16 is defined by a conveyance guide 16a and a conveyance surface 16b facing the conveyance guide 16a. The subsequent forward slope portion 17 is defined by the head surface 20a of the dot impact type print head 20 and the platen 21 facing the print head 20 at a constant interval. It has become. The print head 20 is disposed so that the head surface 20a faces rearward and faces upward. Corresponding to the inclination of the print head 20, the surface of the platen 21 is disposed in a state inclined downward toward the front. The print head 20 is mounted on a head carriage 22, and the head carriage 22 can reciprocate in the width direction along the carriage guide shaft 23.

  A mounting portion 10 for the ribbon cassette 9 is formed on the upper side of the head carriage 22. The mounting portion 10 is also inclined and arranged so as to be directed upward toward the rear. Accordingly, the ink ribbon 9a of the ribbon cassette 9 mounted here can be set between the print head 20 and the platen 21 so as to be parallel to them.

  A rear ramp portion 18 that is continuous with the front ramp portion 17 is defined by a conveyance guide 28 that extends in a direction bent rearward from the upper end of the platen 21. A paper feed mechanism having a paper feed roller 25, a paper press roller 26, and a biasing member (not shown) for biasing the paper press roller 26 toward the paper feed roller 25 is provided in the rear inclined path portion 18. Is arranged. The paper feed roller 25 is disposed on the rear side of the rear inclined portion 18, and the paper pressing roller 26 is supported on the front side so as to be movable in a direction approaching the paper feed roller 25 with respect to the roller mounting plate 29. The paper feed roller 25 is biased.

  The recording paper 7 a pulled out from the recording paper roll 7 is sandwiched between the paper feeding roller 25 and the paper pressing roller 26, and is conveyed along the conveying path 15 by rotating the paper feeding roller 25 by a driving source (not shown). Is done. In this example, the platen 21 and the conveyance guide 16a continuous below the platen 21 are formed by a single platen frame 55, and the conveyance guide 28 is attached to the upper end portion of the platen frame 55. .

  Next, a vertical automatic cutting unit 30 for cutting the recording paper is disposed in the vicinity of the recording paper discharge port 5. The automatic cutting unit 30 includes a fixed blade 31 disposed on the front side, a movable blade 32 disposed on the rear side, and a drive mechanism 33 for operating the movable blade 32 across the conveyance path of the recording paper. Yes. The movable blade 32 and the drive mechanism 33 are built in the case 34. The recording paper 7 a between the fixed blade 31 and the movable blade 32 is cut when the movable blade 32 slides on the upper surface of the fixed blade 31. Further, a cutting blade 35 capable of cutting the recording paper by manual operation is attached to the front edge portion of the recording paper discharge port 5.

  FIG. 4 is a perspective view showing the printer unit 11 built in the printer case, and FIG. 5 is a perspective view showing a state in which the open / close side unit is opened. The printer unit 11 includes a fixed side unit 12 and an open / close side unit 13, and the open / close side unit 13 is supported by the fixed side unit 12 so as to be rotatable up and down around the rear end portion.

  In the printer unit 11 of this example, when the opening / closing lid 4 of the storage unit 8 of the recording paper roll is opened in order to easily perform the replacement operation of the recording paper roll 7, the recording paper conveyance having the above-described configuration is performed. The path 15 is also configured to be in an open state. For this purpose, the components on one side constituting the conveyance path 15 are attached to the fixed side unit 12, and the opening / closing lid 4 and the other side constituting the conveyance path 15 are attached to the opening / closing side unit 13 on the moving side. When the side components are attached and the open / close unit 13 is opened, the storage section 8 of the recording paper roll 7 is opened, and at the same time, the transport path 15 is opened.

  More specifically, the recording unit 8 for the recording paper roll, the conveyance surface 16b of the conveyance path portion 16, the print head 20, the paper pressing roller 26, and the fixed blade 31 of the automatic cutting unit 30 are attached to the fixed side unit 12. Yes. On the other hand, the open / close side unit 13 includes a platen frame 55 (conveyance guide 16a, platen 21) and a guide plate 28 that define the conveyance path portion 16, the front ramp portion 17 and the rear ramp portion 18, and The paper feed roller 25, the movable blade 32 of the automatic cutting unit 30, and the drive mechanism 33 are attached. An open / close lid 4 is also attached (see FIG. 3).

  As can be seen from FIGS. 3 and 5, when the opening / closing unit 13 is fully opened (open position), the recording paper roll 7 can be loaded by a simple operation of dropping the recording paper roll 7 into the storage unit 8 from above. In addition, since the transport path 15 is in an open state, the operation of placing the recording paper 7a pulled out from the recording paper roll 7 along the transport path 15 is extremely simple. Further, when the opening / closing unit 13 is closed and returned to the state shown in FIGS. 2 and 4 (closed position), the recording paper 7 a is located between the print head 20 and the platen 21, and between the paper feed roller 25 and the paper pressing roller 26. A state of being pulled out from the recording paper discharge port 5 through the paper is automatically formed.

  Next, the structures of the fixed side unit 12 and the open / close side unit 13 will be described in more detail. First, the fixed side unit 12 includes a main body frame 40, and a carriage guide shaft 23 is stretched across the front side portion of the main body frame 40 in the width direction. As described above, the head carriage 22 on which the print head 20 is mounted is supported on the carriage guide shaft 23 so as to be capable of reciprocating. A ribbon frame 41 is attached so as to cover the head carriage 22 and the print head 20, and an outer peripheral portion of the ribbon frame 41 serves as a mounting portion 10 of the ribbon cassette 9.

  A storage portion 8 for loading the recording paper roll 7 is formed at a rear portion of the main body frame 40, and a support shaft 43 extending in the width direction is formed at the rear end portion of the storage portion 8. It is stretched over. The support shaft 43 serves as a rotation center of the opening / closing unit 13.

  On the other hand, the open / close side unit 13 has an open / close frame 51. The open / close frame 51 has a front end that connects left and right arm portions 52, 53 extending in the front-rear direction and front end portions of the arm portions 52, 53. And a connecting plate portion 54. The rear end portions of the left and right arm portions 52 and 53 are rotatably supported by both end portions of the rotation center shaft 43. A platen frame 55 is attached to the front end of the front end connecting plate portion 54 of the opening / closing frame 51, and a paper feed roller shaft 25 a is attached to the back side thereof, and an opening formed in the guide plate 28 in the platen frame 55. From the portions 28a and 28a, the outer peripheral surfaces of the two paper feed roller bodies 25b and 25b fixed coaxially to the paper feed roller shaft 25a protrude forward. The movable blade 32 and the drive mechanism 33 of the automatic cutting unit 30 are mounted on the front end connecting plate portion 54 of the opening / closing frame 51.

(Brake mechanism of the lid 4)
FIG. 6 is an explanatory view showing a braking mechanism of the opening / closing lid 4 mounted on the printer 1, and FIG. 7 is an explanatory view showing a braking mechanism when the opening / closing lid 4 is fully opened. The braking mechanism 100 of this example includes a cam part 110 that is detachably attached to the opening / closing frame 51 of the opening / closing unit 13 to which the opening / closing lid 4 is attached, and a braking unit that is detachably attached to the main body frame 40 of the fixed side unit 12. 150. The cam part 110 is attached to the inner side surface of the left arm portion 52 of the open / close frame 51, and the braking unit 150 is attached to the left side plate portion 40 a of the rear end portion of the main body frame 40.

  As shown in these drawings, the lock mechanism 60 of the open / close lid 4 includes a latch pin 61 attached to the fixed side unit 12 and a latch claw 62 attached to the tip of the open / close frame 51 of the open / close side unit 13. It has. The latch claw 62 can pivot back and forth about the support shaft 63 and is biased by a biasing member (not shown) so that the lower claw portion 62a of the support shaft 63 is pushed backward. In the state in which the open / close lid 4 is in the closed position, as shown in FIG. 6, the claw portion 62a of the latch claw 62 latches the latch pin 61 from the front side to form a locked state. When the slide button 6 (see FIG. 1) is operated, the latch claw 62 pivots forward and the locked state is released. When closing the open / close lid 4, the end face portion 62 b of the claw portion 62 a of the latch claw 62 first hits the latch pin 61. This state is the position where the locking mechanism 60 starts the locking operation, and when the opening / closing lid 4 is pushed in this state, the latch claw 62 is pushed up against the urging force by the latch pin 61 fixedly arranged, and the latch pin 61 is pushed. After getting over, the locked state shown in FIG. 6 is formed again. Since the latch claws 62 are attached to both sides of the front end portion of the opening / closing frame 51, the opening / closing lid 4 can be locked in the closed position without rattling.

  8 is a perspective view showing only the braking function 100, FIG. 9 is a side view and a perspective view of the cam component 110, and FIG. 10 is a perspective view and an exploded perspective view of the braking unit. The cam part 110 is, for example, a plastic molded product. A cylindrical rotation pin 112 and a frame insertion groove 115 defined by the outer side surface 111 and a pair of engagement claws 113 and 114 are provided on the outer side surface 111 thereof. Is formed. An insertion hole (not shown) for the rotation pin 112 is formed in the inner side surface 53 a of the left arm portion 53 of the opening / closing frame 51, and the outer side surface 111 of the cam part 110 is connected to the left arm portion 53 of the opening / closing frame 51. When the cam part 110 is turned around the rotation pin 112 in this state, the left arm portion 53 is inserted into the frame insertion groove 115. The edge portion is fitted, and a state in which the arm portion 53 is gripped between the pair of engaging claws 113 and 114 and the engaging claw 116 formed on the opposite side is formed, and the cam part 110 is in the arm portion 53. Fixed to. Therefore, when the cam part 110 attached to the arm part 53 is turned to the opposite side around the rotation pin 112, the cam part 110 can be removed from the arm part 53.

  A cam groove 120 is formed in the lower end portion of the cam part 110 on the inner side surface 117 side. When the cam groove 120 is attached to the arm portion 53 of the opening / closing frame 51, the flat cam surface 121 extending in the vertical direction facing the front of the printer and the lower end of the flat cam surface 121 smoothly and continuously to the rear of the printer. A cam surface 122 that bends and extends, a cam surface 123 that continuously extends to the front of the printer via an arc surface at the rear end of the cam surface 122, and a slight inclination upward from the front end of the cam surface 123. And a cam surface 124 that bends and extends at an angle.

  Next, the braking unit 150 includes a unit frame 151 having an L-shaped cross section, and a pair of front and rear screw holes 153 and 154 are formed in the horizontal plate portion 152 of the unit frame 151. A flange 156 that is bent horizontally is formed at a rear end portion of the vertical plate portion 155 of the unit frame 151, and a screw hole 157 is also formed here. The horizontal plate portion 152 and the flange 156 of the unit frame 151 are detachably fixed to the left side plate portion 40a of the main body frame 40 by fastening screws (not shown).

  A swing arm 160 is attached to the front portion of the vertical plate portion 155 of the unit frame 151 so as to be swingable in the vertical direction. The swing arm 160 is horizontally arranged from the outer side surface of a disk-shaped base end portion 161, an arm main body portion 162 extending from the base end portion 161, and a small-diameter disc portion 163 formed at the tip of the arm main body portion 162. And a cylindrical cam follower 170 extending in the direction. A screw hole (not shown) is formed in the center of the base end portion 161 of the swing arm 160, and the swing arm 160 is centered on a fastening screw 164 that passes through this and is fixed to the vertical plate portion 155 by screwing. Is swingable.

  Here, on the outer side surface of the base end portion 161 of the swing arm, a plurality of annular disc springs 166 are pressed by a fastening screw 164 via a fixing plate 167 with a friction disk 165 interposed therebetween. A cylindrical sleeve 168 is inserted through the disc spring 166, and the compression amount of the disc spring 166 in the fastening direction of the fastening screw 164 is regulated by the length of the sleeve 168. As a result, the base end portion 161 of the swing arm 160 is sandwiched from both sides with a predetermined force, and a predetermined frictional resistance acts when swinging. By adjusting the compression amount of the plurality of disc springs 166, the frictional resistance can be increased or decreased.

  By holding the friction plate 165 between the unit frame 151 and the swing arm 160, it is possible to improve the retention of the lubricating oil. In this case, as shown in FIG. 10 (b), if holes (four in this embodiment) are provided on the sliding surface, that portion is effective as a lubricating oil reservoir. Further, when the unit frame 151 and the swing arm 160 are made of the same material SECC, the friction plate 165 can be made of another material such as SUS to improve wear resistance. Can do.

(Description of brake mechanism operation)
11 to 13 are explanatory views showing the operation of the braking mechanism 100. FIG. First, FIG. 11A shows the positional relationship when the open / close lid 4 is in the closed position. In this case, the circular outer peripheral surface of the cam follower 170 centering on the fastening screw 164 fixed on the main body frame 40 side is flat in the cam part 110 on the open / close frame 50 side to which the open / close lid 4 is attached. The cam surface 121 is in contact with the cam surface 121 from the rear side of the printer.

  In this state, when the lock by the lock mechanism 60 (see FIG. 6) is released and the opening / closing lid 4 is opened, the cam part 110 rotates about the support shaft 43 upward. The cam follower 170 slides relatively downward on the cam surface 121 as the opening / closing lid 4 is opened, and the swing amount of the swing arm 160 to which the cuff follower 170 is attached is very small. Therefore, when the opening / closing lid 4 starts to open, the braking force acting on the opening / closing lid 4 by the braking mechanism 100 is extremely small.

  As shown in FIG. 11B, when the opening / closing lid 4 is opened approximately 10 degrees from the closed position, the cam follower 170 is detached from the first cam surface 121. As shown in FIG. 11C, when the opening / closing lid 4 is opened approximately 15 degrees, the cam surface 124 hits the cam follower 170. Thereafter, as the opening degree (rotation amount) of the opening / closing lid 4 increases, the cam follower 170 slides from the cam surface 124 toward the cam surface 123 continuous thereto, and is moved upward by the cam surface 124. Pressed. As a result, the swing arm 170 supporting the cam follower 170 swings upward. Since the swing arm 170 is given frictional resistance by the disc spring 166, a predetermined braking force is applied to the opening operation of the opening / closing lid 4. Therefore, the open / close lid 4 does not open vigorously. In this example, as shown in FIG. 12A, when the opening / closing lid 4 opens about 60 degrees, the cam follower 170 reaches the end of the cam surface 123, and thereafter, as the opening degree of the opening / closing lid 4 increases. Slid along the cam surface 123 to the opposite side. Then, as shown in FIG. 12B, when the open / close lid 4 reaches the fully open position (open position) where the open / close lid 4 is opened approximately 90 degrees, the cam follower 170 returns to the cam surface end of the cam surface 123.

  Next, when the open / close lid 4 in the open position is closed, the cam component 110 is rotated accordingly, and the cam surface 123 is separated from the stopped cam follower 170, and instead, the end of the opposite cam surface 122. Will come into contact with the cam follower 170. FIG. 13A shows a state in which the opening / closing lid 4 is closed to a position of about 85 degrees. Thereafter, in conjunction with the closing operation of the opening / closing lid 4, the cam follower 170 is pushed downward by the cam surface 122, so that the swing arm 160 swings downward. Therefore, a predetermined braking force acts on the closing operation of the opening / closing lid 4. The cam follower 170 reaches the end of the cam surface 122 when the opening / closing lid 4 is closed to approximately 45 degrees, and then slides on the cam surface 122 in the opposite direction. And as shown in FIG.13 (c), when the opening-and-closing lid | cover 4 will close to the opening degree of about 30 degree | times, it will return to the other end of the cam surface 122. FIG.

  When the opening / closing lid 4 is further closed, the cam follower 170 is detached from the cam surface 122 and is in contact with the cam surface 121 as shown in FIG. Thereafter, the cam follower 170 slides on the cam surface 121 while the opening / closing lid 4 is moved to the closed position. When the cam surface 121 rotates about the support shaft 43, the swing amount of the swing arm 160 that is pressed by the cam surface 121 and swings is small. That is, the swing amount of the swing arm 160 when the cam surfaces are rotated with the cam followers 170 hitting the cam surfaces 122, 123, and 124 is small. Therefore, when the opening / closing lid 4 is closed, after the cam follower 170 comes off the cam surface 122 and comes into contact with the cam surface 121, the braking force acting on the opening / closing lid 4 is reduced.

  Thus, in this example, when the opening / closing lid 4 is closed, after the opening / closing lid 4 is at an angle immediately before the closing position, a braking force smaller than the braking force that has been applied until then is applied. Accordingly, if the locking mechanism 60 is set to start the locking operation after the rotation position at which the braking force is switched to a small value, the opening / closing lid 4 is deformed by the large braking force at the time of locking and is brought into a one-closed state. You can avoid the negative effect of falling. Further, if the movement trajectory of the cam surfaces 122, 123, and 124 and the movement trajectory of the cam follower 170 are appropriately set, the locking operation starts while the open / close lid 4 moves to the open position after unlocking and from the open position. A large braking force can be applied to the open / close lid during the movement up to. Therefore, if the value of the braking force is set appropriately, the opening / closing lid 4 opens and closes vigorously, and the operator may be injured, and the opening / closing lid components may be damaged. It can prevent harmful effects.

  Here, the braking mechanism 100 of this example is detachable from the printer 1. That is, the braking unit 150 is detachably attached to the main body frame 40, and the cam part 110 is detachably attached to the opening / closing frame 51. Therefore, the braking mechanism 100 can be removed when it is not necessary to apply the braking force so much when the opening / closing lid 4 is opened and closed. For example, when the printer 1 is used in a horizontal position where it is installed horizontally on a register counter, for example, a braking force of a torsion spring attached to the support shaft 43 is sufficient to open and close the opening / closing lid 4. It is.

  On the other hand, when the printer 1 is used in a vertical position attached to a wall, the closing position of the opening / closing lid 4 is vertical, and when the opening / closing lid 4 is opened, the vertical closing position is changed to the horizontal opening position. It opens vigorously due to its own weight. Therefore, a large braking force is required. In such a case, if the braking mechanism 100 is attached, it can be prevented that a large braking force acts on the opening / closing lid 4 to open the opening / closing lid vigorously. Further, since the large braking force is switched to the small braking force from the position where the locking operation of the opening / closing lid 4 starts, the occurrence of one-side closing of the opening / closing lid 4 can be avoided.

1 is an external perspective view of a printer to which a braking mechanism of the present invention can be applied. It is a schematic longitudinal cross-sectional view of the printer of FIG. It is a schematic longitudinal cross-sectional view in the state which opened the opening-and-closing lid | cover in the printer of FIG. FIG. 2 is a perspective view showing a printer unit built in the printer of FIG. 1. FIG. 5 is a perspective view showing a state where the open / close side unit is opened in the printer unit of FIG. 4. It is explanatory drawing which shows the state in which the brake mechanism to which this invention was applied to the printer of FIG. 1 was attached. In FIG. 6, it is explanatory drawing which shows the state which the opening-and-closing lid | cover of the printer opened. It is a perspective view which shows the braking mechanism of FIG. It is the side view and perspective view which show the cam component of the braking mechanism of FIG. FIG. 7 is a perspective view and an exploded perspective view showing a braking unit of the braking mechanism of FIG. 6. It is explanatory drawing which shows operation | movement of the braking mechanism of FIG. 6 in the case of opening an opening-and-closing lid. It is explanatory drawing which shows operation | movement of the braking mechanism of FIG. 6 in the case of opening an opening-and-closing lid. It is explanatory drawing which shows operation | movement of the braking mechanism of FIG. 6 in the case of closing an opening-and-closing lid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer, 4 Opening / closing lid, 5 Recording paper discharge port, 7 Recording paper roll, 7a Recording paper, 8 Recording paper roll accommodating part, 11 Printer unit, 12 Fixed side unit, 13 Opening / closing side unit, 15 Recording paper conveyance path, 20 Print head, 21 Platen, 25 Paper feed roller, 26 Paper pressing roller, 40 Main body frame, 43 Support shaft, 43a Rotation center, 51 Opening / closing frame, 53 Arm part, 100 Braking mechanism, 110 Cam part, 112 Rotating pin, 113, 114, 116 engaging claw, 115 frame insertion groove, 120 cam groove, 121 cam surface, 122 cam surface, 123 cam surface, 124 cam surface, 150 braking unit, 151 unit frame, 152 horizontal plate portion, 153, 154 Screw hole, 155 Vertical plate part, 156 Flange, 157 Screw hole, 1 0 oscillating arm 161 proximal portion, 162 arm body 163 distal portions, 164 fastening screws (pivot shaft), 165 friction plate, 166 disc spring, 167 fixed plate, 169 the sleeve 170 cam follower

Claims (6)

An opening / closing lid braking mechanism that rotates between a closed position and an open position about a support shaft supported by a housing and applies a braking force to the rotation of the opening / closing lid that can be locked to the closed position by a locking mechanism. And
A cam member attached to the opening / closing lid;
A cam follower capable of swinging about a swing shaft supported by the housing;
A friction member imparting a predetermined friction resistance to the swinging motion of the cam follower,
The cam member includes a cam surface on which the cam follower can slide as the opening / closing lid rotates.
The cam surface includes a first cam surface region in which a swing amount of the cam follower is small with respect to a rotation amount of the opening / closing lid, and a second cam surface swing amount with respect to the rotation amount of the opening / closing lid is larger than the first cam surface region. A cam surface area,
The cam follower slides on the second cam surface area until the opening / closing lid, which is unlocked by the locking mechanism, rotates to the open position,
An opening / closing lid braking mechanism in which the cam follower slides on the first cam surface region during a period from when the opening / closing lid reaches the closing position after the locking operation by the locking mechanism starts. In claim 1,
The cam surface includes a third cam surface region in which a swing amount of the cam follower with respect to a rotation amount of the opening / closing lid is larger than the first cam region,
A braking mechanism for the opening / closing lid in which the cam follower slides on the third cam surface region from the opening position to a position where the locking operation by the locking mechanism starts. In claim 1 or 2,
A brake unit that is detachably attached to the housing; and the cam member that is detachably attached to the opening / closing lid,
The brake unit is a brake mechanism for an opening / closing lid provided with the cam follower, the swing shaft, and the friction member. In claim 3,
The braking unit includes a unit frame attached to the housing, and a swing arm having the cam follower attached to a tip portion thereof.
The swing arm includes a base end portion in which a screw hole is formed,
The friction member is a plurality of disc springs formed with a center hole,
The swing shaft includes a fastening screw that is fastened to the unit frame through a center hole of the disc spring and a screw hole of the swing arm,
An opening / closing lid braking mechanism in which the disc spring is pressed against the base end of the swing arm from the side by the fastening screw.   A printer comprising the opening / closing lid braking mechanism according to any one of claims 1 to 4. In claim 5 ,
A storage section for storing the recording paper roll;
A printer comprising the opening / closing lid attached to an opening of the storage unit.

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