A pressure structure used in printers to limit the movement of printing consumables.

Abstract

A pressing structure for controlling the transmission of printing consumables in a printer is disclosed, which allows the leading edge of the printing paper to be easily inserted into the printing channel below the printhead during printing preparation. The structure includes a pressure bar that presses the roll of printing consumable paper down to near the plane of the printhead. When the leading edge of the printing consumable paper is inserted into the printing channel, the pressure bar is a vertically openable lifting structure located on the left and right side walls of the printer, allowing both ends of the pressure bar to be raised. This lifting structure makes it easier and faster for operators to change rolls of printing consumables, and also avoids the paper breakage that easily occurs when passing through the pressure bar due to the small gap between the pressure bar and the base plate in existing technologies.

Description

Technical Field

[0001] This invention relates to a printer, and more particularly to a pressing structure that confines the paper of printing consumables to a certain height during transport. Background Technology

[0002] Label printers are now widely used, and there are many types and specifications of label paper used, such as coated paper, silver paper, polyester matte paper, PET, PVC, fragile paper, clothing tags, thermal paper, etc.

[0003] When preparing to print, the roll printing consumables are first loaded into the printer. Then, the front end of the paper is pulled out and passed under the pressure bar used for paper guidance before being inserted into the printing channel located below the print head. In the existing technology, the pressure bar is a fixed structure that cannot be moved. Therefore, before inserting the paper into the printing channel, the pressure bar must be passed under, which is inconvenient for paper loading and printing. When the diameter of the paper roll is large, the internal space of the machine is limited, and the paper must be positioned vertically and horizontally during the printing process. When completing the vertical positioning, since most of the current vertical positioning devices are fixed structures, the operating space is small, making it very difficult to place large rolls of material. Some vertical positioning structures are fixed together with the horizontal positioning devices to limit the upper position of the two edges of the material. Such devices are not effective in vertical positioning when the material is relatively wide. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pressing structure for limiting and transmitting printing consumables in a printer, which can easily insert the front end of the printing paper into the printing channel below the print head when preparing to print.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] The present invention relates to a pressing structure for limiting and transmitting printing consumables in a printer, comprising a roll of printing consumables placed in a paper feed channel and a pressure bar pressing the roll of printing consumables paper down to a plane close to the print head. The characteristic feature is that when the first end of the roll of printing consumables paper is inserted into the printing channel, the pressure bar is a vertically openable movable connection structure, which is a lifting structure provided on the left and right side walls of the printer that allows both ends of the pressure bar to be raised.

[0007] The lifting structure consists of inclined slots on the two side walls and an elastic fixing component that can stabilize the pressure rod at the bottom of the inclined slots. The top of the inclined slot is a horizontal slot that can support the pressure rod. The vertical distance between the bottom of the inclined slot and the bottom plate of the housing is the same as the vertical distance between the pressure rod and the bottom plate of the housing when the pressure rod is in its normal working position.

[0008] The elastic fixing component consists of an elastic retaining ring and a tension spring. The two ends of the pressure rod are stepped rods, and the end passes through the inclined strip hole and is placed on the outer or inner surface of the corresponding side wall. The elastic retaining ring can limit the end of the pressure rod outside the corresponding side wall. The upper end of the tension spring is fixed to the end of the pressure rod, and the lower end of the tension spring is connected to the outer surface of the corresponding side wall and located on one side of the lower end of the inclined strip hole. The angle between the tension spring with its upper end in the horizontal strip hole and the inclined strip hole is an acute angle.

[0009] The inclined strip is inclined from top to bottom from the side closest to the printhead towards the roll-to-roll printing consumable side; the tension spring is inclined from the side closest to the roll-to-roll printing consumable towards the printhead side.

[0010] The elastic fixing component is a positioning spring. The positioning spring is disposed on the outer surface of the corresponding side wall, and its lower end is fixed to one side of the inclined strip hole. The other part of the positioning spring is in an elastic free state. The telescopic section of the positioning spring extends towards the central axis of the inclined strip hole. The two ends of the pressure rod can be squeezed up and down through the positioning spring in the inclined strip hole and placed at the bottom of the inclined strip hole or in the horizontal strip hole.

[0011] The lifting structure consists of shaft holes on both sides of the printer, a narrow-diameter end post at one end of the pressure rod, and an elastic component at the other end. The vertical distance between the shaft hole and the bottom plate of the housing is the same as the vertical distance between the pressure rod and the bottom plate of the housing when the pressure rod is in the normal working position. The narrow-diameter end post is inserted into the shaft hole on the corresponding side wall, and the other end of the pressure rod is fixed in the shaft hole on the corresponding side wall by the elastic component.

[0012] The elastic component consists of an independently set stepped shaft, a helical spring, and a locking pin. The other end of the pressure rod has a hollow inner cavity. A strip-shaped outer pin hole is provided on the side wall of the pressure rod corresponding to the hollow inner cavity. The large-diameter portion of the stepped shaft has a hollow concave cavity. The outer end of the helical spring is inserted into the hollow concave cavity, and the inner end of the helical spring is inserted into the hollow inner cavity together with the large-diameter portion of the stepped shaft. An inner pin hole is provided on the side wall of the stepped shaft, into which the locking pin can be inserted. The small-diameter portion of the stepped shaft is inserted into the shaft hole on the corresponding side wall.

[0013] The elastic component consists of an independently configured short shaft, a helical spring, a connecting sleeve, and a pin. The outer end of the short shaft is fixed to a shaft hole in the corresponding side wall. A pin hole is provided on the shaft wall at the inner end of the short shaft. The helical spring is sleeved on the short shaft. The connecting sleeve consists of a disc portion and a cylindrical portion with diameters larger than the outer diameter of the helical spring and smaller than the diameter of the pressure rod, respectively. The connecting sleeve is sleeved on the short shaft with the cylindrical portion facing the other end of the pressure rod. The pin is inserted into the pin hole to limit the connecting sleeve to the short shaft in an elastically compressible manner. The other end of the pressure rod has a hollow inner cavity into which the cylindrical portion of the connecting sleeve can be inserted.

[0014] The lifting structure consists of support rods fixed to the two side walls of the printer. Each support rod includes a positioning groove that allows the end of the pressure rod to be pressed into it and a positioning block that stabilizes the end of the pressure rod in the positioning groove. The positioning block has a hollow channel that is perpendicular to the pressure rod and passes through the positioning block. An end post, a compression spring, and a ball are installed sequentially from the outside to the inside of the hollow channel. The spherical crown surface of the ball, which is smaller than its radius, is placed in the positioning groove and contacts the upper half of the pressure rod. The vertical distance between the positioning groove and the bottom plate of the printer housing is the same as the vertical distance between the pressure rod and the bottom plate of the printer housing when the pressure rod is in the normal working position.

[0015] A plastic tube, longer than the width of the roll-to-roll printing filament and with smooth surfaces both inside and out, is sleeved on the pressure rod. The diameter of the plastic tube is slightly larger than the diameter of the pressure rod.

[0016] Compared with existing technologies, this invention improves the fixed pressure bar used for limiting the transmission of printing consumables into a movable connection structure. This movable connection structure is a lifting structure installed on the left and right side walls of the printer, which allows the two ends of the pressure bar to be raised. With the lifting structure, operators can save effort and load printing consumables more quickly when changing roll-type printing consumables. Furthermore, it avoids the damage to the printing paper that easily occurs when passing through the pressure bar due to the small gap between the pressure bar and the base plate, as is common in existing technologies. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of Embodiment 1 of the downward pressing structure of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram showing the compression bar in its normal operating position.

[0019] Figure 3 for Figure 1 A schematic diagram showing the compression bar after it has been raised.

[0020] Figure 4 for Figure 1 An explosion diagram.

[0021] Figure 5 This is a schematic diagram of Embodiment 2 of the downward pressing structure of the present invention.

[0022] Figure 6 for Figure 5 A schematic diagram showing the compression bar in its normal operating position.

[0023] Figure 7 for Figure 5 A schematic diagram showing the compression bar after it has been raised.

[0024] Figure 8 for Figure 5 An explosion diagram.

[0025] Figure 9 This is a schematic diagram of Embodiment 3 of the downward pressing structure of the present invention.

[0026] Figure 10 for Figure 9 An explosion diagram.

[0027] Figure 11 This is a schematic diagram of Embodiment 4 of the downward pressing structure of the present invention.

[0028] Figure 12 for Figure 11 An explosion diagram.

[0029] Figure 13 This is a schematic diagram of embodiment 5 of the pressure-down structure of the present invention.

[0030] Figure 14 for Figure 13 An explosion diagram.

[0031] The attached figures are labeled as follows:

[0032] Printing consumables 1, pressure rod 2, side wall 3, inclined strip hole 4, horizontal strip hole 41, elastic retaining ring 42, tension spring 43, positioning spring 44, shaft hole 5, small diameter end post 51, stepped shaft 52, helical spring 53, locking pin 54, outer pin hole 55, inner pin hole 56, short shaft 6, helical compression spring 61, pin 62, radial pin hole 63, connecting sleeve 64, disc part 65, cylinder part 66, support rod bracket 7, positioning groove 71, positioning block 72, hollow channel 73, end post 74, compression spring 75, ball bearing 76. Detailed Implementation

[0033] For roll-type printing consumables 1, they should not be directly inserted into the printing channel below the print head for printing. Instead, the entire roll of printing consumables 1 should first be installed in the paper feed channel in front of the print head ("in front" here means before printing). Before printing, the paper to be entered into the printing channel should be limited vertically and horizontally. Then, it should be transferred to the printing channel. This can effectively avoid the problem of paper misalignment during the printing process.

[0034] like Figure 1-14 As shown, the pressing structure of the present invention for limiting the transmission of printing consumable 1 in a printer is a lifting structure in which the pressure bar 2, which is located between the printing consumable 1 and the print head in the printer, is set as a lifting structure that can be quickly lifted as needed. When the operator is ready to print, he only needs to lift the pressure bar 2 to easily insert the front end of the paper of the printing consumable 1 into the printing channel.

[0035] Meanwhile, in order to reduce the friction between the printing paper and the pressure bar 2 during the transmission process, which could easily damage the printing paper, the present invention has a plastic tube with a length greater than the width of the printing consumable 1 and smooth surfaces inside and out sleeved on the pressure bar 2. The diameter of the plastic tube is slightly larger than the diameter of the pressure bar 2, so that the sliding friction between the printing paper and the pressure bar 2 can be changed to rolling friction.

[0036] The cross-sectional shape of the pressure rod 2 in this invention is preferably circular.

[0037] Example 1

[0038] like Figure 1-4 As shown, the lifting structure consists of inclined slots 4 on the two side walls 3 and an elastic fixing component that can stabilize the pressure rod 2 at the bottom of the inclined slots 4; the top of the inclined slots 4 is a horizontal slot 41 that can support the pressure rod 2, and the vertical distance between the bottom of the inclined slots 4 and the bottom plate of the housing is the same as the vertical distance between the pressure rod 2 and the bottom plate of the housing when the pressure rod 2 is in the normal working position.

[0039] Each inclined bar hole 4 penetrates the corresponding side wall 3, and the two ends of the pressure rod 2 are each inserted into the corresponding inclined bar hole 4.

[0040] In this embodiment, the elastic fixing component consists of an elastic retaining ring 42 and a tension spring 43. The two ends of the pressure rod 2 are stepped rods, which pass through the inclined strip hole 4 and are placed on the outer surface of the corresponding side wall 3 and connected to the elastic retaining ring 42.

[0041] The upper end of the tension spring 43 is fixed to the end of the pressure rod 2. There are several ways to fix it: it can be sleeved on the end of the pressure rod 2 exposed on the outer surface of the corresponding side wall 3, or a hook hole can be provided on the corresponding nut to hook the tension spring 43 into the hook hole. The lower end of the tension spring 43 is fixed to the outer surface of the corresponding side wall 3 and located on one side of the lower end of the inclined strip hole 4. When it is necessary to lift the pressure rod 2 from its normal working position, simply pull the middle of the pressure rod 2 upwards and place it at the horizontal strip hole 41. This will raise the pressure rod 2 and place it at a higher position, making it easier to insert the printing paper into the printing channel. After loading the printing paper, the pressure rod 2 can be moved to its normal working position. Under the action of the tension spring 43, the pressure rod 2 can be stably and reliably positioned in its normal working position.

[0042] Preferably, in this invention, the inclined slot 4 is inclined from top to bottom from the side closer to the print head towards the printing consumable 1; the tension spring 43 is inclined from the side closer to the printing consumable 1 towards the print head. This arrangement helps to avoid touching the thicker diameter printing consumable 1 when pulling the pressure rod 2 upward by hand.

[0043] Preferably, when the pressure rod 2 is in the horizontal bar hole 41, the angle between the tension spring 43 and the inclined bar hole 4 is an acute angle. This arrangement allows the tension spring 43 to be pulled into the horizontal bar hole 41 without requiring too much force when the pressure rod 2 is pulled upwards.

[0044] Example 2

[0045] like Figure 5-8 As shown, the difference between this embodiment and embodiment 1 is that the structure of the elastic fixing component and the pressure rod 2 is different, while the setting of the inclined strip hole 4 and the horizontal strip hole 41 is the same as in embodiment 1.

[0046] 1) The elastic fixing component in this embodiment can be simply a positioning spring 44. The positioning spring 44 is disposed on the outer surface of the corresponding side wall 3, and its lower end is fixed to one side of the inclined slot 4. The other parts of the positioning spring 44 are in an elastic free state, that is, after pressure is applied to the other parts, the other parts can be displaced. In the original state when the positioning spring 44 is not subjected to external force, its telescopic section extends towards the central axis of the inclined slot 4.

[0047] When it is necessary to lift the pressure rod 2 from bottom to top, hold the pressure rod 2 and pull it upward. During the upward movement of the two ends of the pressure rod 2 in the inclined strip hole 4, it squeezes the positioning spring 44 and passes through the positioning spring 44 to be placed in the horizontal strip hole 41. At this time, the inclined piece at the upper end of the positioning spring 44 abuts against the lowest point of the pressure rod 2 to prevent the pressure rod 2 from falling freely. Similarly, when it is necessary to put the pressure rod 2 in the horizontal strip hole 41 back to its original position (i.e., the bottom end of the inclined strip hole 4), hold the pressure rod 2 and move it downward and squeeze the positioning spring 44 to pass through the positioning spring 44.

[0048] 2) The elastic fixing component in this embodiment can also be composed of a positioning spring 44 and a positioning bearing (not shown in the figure). The positioning bearing is installed on the outer surface of the corresponding side wall 3 and located at the bottom of the inclined slot 4. The positioning spring 44 is a retractable elastic thin metal sheet, which is bent into an arc shape. The positioning spring 44 is set on the outer surface of the corresponding side wall 3 and located above the positioning bearing by a snap-fit ​​block. The plane of the thin sheet of the positioning spring 44 is parallel to the pressure rod 2 placed in the inclined slot 4, and its retractable section extends towards the central axis of the inclined slot 4.

[0049] The pressure rod 2 is a cylindrical rod with both ends passing through the inclined strip hole 4 and placed in the positioning bearing.

[0050] The inner surface of the positioning bearing is either a smooth surface or an inner surface structure with multiple ball bearings 76.

[0051] When the pressure rod 2 placed in the horizontal bar hole 41 needs to be placed in the normal working position, the middle part of the pressure rod 2 is inserted and squeezed from top to bottom through the retractable section of the positioning spring 44 along the inclined bar hole 4 and placed in the positioning bearing. At this time, the retractable section of the positioning spring 44 returns to its original position and blocks the pressure rod 2 above it to prevent the pressure rod 2 from jumping upward without human force.

[0052] In addition, since the inner surface of the positioning bearing is a smooth surface or a surface with balls 76, this structure also facilitates the rotation of the pressure rod 2 within it.

[0053] Example 3

[0054] like Figure 9 , 10 As shown, the lifting structure consists of shaft holes 5 on both sides of the printer wall 3, a thin-diameter end post 51 on one end of the pressure rod 2 and an elastic component on the other end.

[0055] The vertical distance between the shaft hole 5 and the bottom plate of the housing is the same as the vertical distance between the pressure rod 2 and the bottom plate of the housing when the pressure rod 2 is in the normal working position, that is, when the pressure rod 2 is installed in the shaft hole 5 on the two side walls 3, it is in the normal working position.

[0056] The narrow-diameter end post 51 (i.e., the middle part with a diameter smaller than that of the pressure rod 2) is inserted into the shaft hole 5 on the corresponding side wall 3, and the other end of the pressure rod 2 is fixed in the shaft hole 5 on the corresponding side wall 3 by the elastic component.

[0057] The elastic component consists of an independently set stepped shaft 52, a helical spring 53, and a locking pin 54.

[0058] The other end of the pressure rod 2 (i.e. the end opposite to the narrow-diameter end post 51) has a hollow inner cavity, and a strip-shaped outer pin hole 55 is provided on the side wall 3 of the pressure rod 2 corresponding to the hollow inner cavity.

[0059] The stepped shaft 52 has an inner end and an outer end. The inner end is opposite to the other end of the pressure rod 2, and the outer end is opposite to the shaft hole 5 on the corresponding side. The diameter of the inner end is larger than that of the outer end. Hereinafter, the inner end will be referred to as the large diameter portion, and the outer end will be referred to as the small diameter portion.

[0060] The large-diameter portion has a hollow cavity, into which the outer end of the helical spring 53 is inserted. Then, the entire helical spring 53, together with the large-diameter portion of the stepped shaft 52, is inserted into the hollow inner cavity at the other end of the pressure rod 2. The small-diameter portion of the stepped shaft 52 is inserted into the shaft hole 5 on the corresponding side wall 3.

[0061] An inner pin hole 56 is provided on the side wall 3 of the large diameter portion of the stepped shaft 52. The locking pin 54 is inserted into the inner pin hole 56 through the outer pin hole 55, and the end of the locking pin 54 is placed in the outer pin hole 55.

[0062] When it is necessary to remove the pressure rod 2 when it is in the normal working position, hold the pressure rod 2 and apply pressure to the stepped shaft 52 side. At this time, the helical spring 53 placed in the hollow inner cavity at the other end of the pressure rod 2 is compressed, and the pressure rod 2 moves towards the stepped shaft 52 side, so that the thin-diameter end post 51 of the pressure rod 2 is pulled out from the corresponding shaft hole 5. Then pull out the stepped shaft 52, and the pressure rod 2 can be easily removed from the printer.

[0063] Example 4

[0064] like Figure 11 , 12 As shown, the difference between this embodiment and embodiment 3 is that the structure of the elastic component and the other end of the pressure rod 2 are different, but the rest are the same.

[0065] The elastic component consists of an independently configured short shaft 6, a helical compression spring 61, a connecting sleeve 64, and a pin 62.

[0066] The short shaft 6 is a stepped column. The diameter of its outer end (the end opposite to the corresponding side wall 3) is smaller than the diameter of its inner end (the end opposite to the pressure rod 2). The outer end is inserted into the shaft hole 5 of the corresponding side wall 3. The outer end and the shaft hole 5 can be tightly fitted or fixedly connected.

[0067] A radial pin hole 63 is provided on the shaft wall at the inner end of the short shaft 6, and a helical compression spring 61 is sleeved on the short shaft 6.

[0068] The connecting sleeve 64 has an axial through hole with a diameter slightly larger than the diameter of the outer end of the short shaft 6. The connecting sleeve 64 is composed of a disc portion 65 and a cylindrical portion 66 with diameters larger than the outer diameter of the helical compression spring 61 and smaller than the diameter of the pressure rod 2, respectively. The connecting sleeve 64 is fitted onto the short shaft 6 by pressing the helical compression spring 61 with its disc portion 65. Then, the pin 62 is inserted into the radial pin hole 63 to limit the connecting sleeve 64 between the radial pin hole 63 and the helical compression spring 61.

[0069] One end of the pressure rod 2 is the same as in embodiment 3, and the other end of the pressure rod 2 has a hollow inner cavity, into which the cylindrical part 66 of the connecting sleeve 64 can be inserted.

[0070] In order to prevent the connecting sleeve 64 from automatically falling off the short shaft 6, and to avoid obstructing the insertion of the cylindrical part 66 of the connecting sleeve 64 into the hollow cavity of the pressure rod 2, the length of the pin 62 is slightly larger than the inner diameter of the axial through hole of the connecting sleeve 64, but smaller than the outer diameter of its cylindrical part 66.

[0071] When it is necessary to remove the pressure rod 2 when it is in the normal working position, hold the pressure rod 2 and apply pressure to the short shaft 6. At this time, the other end of the pressure rod 2 presses the connecting sleeve 64 and then squeezes the spiral spring 61 to move, so that the fine-diameter end post 51 of the pressure rod 2 is pulled out from the corresponding shaft hole 5. Then remove the other end of the pressure rod 2 from the connecting sleeve 64, and the pressure rod 2 can be easily removed from the printer.

[0072] Example 5

[0073] like Figure 13 , 14 As shown, the lifting structure consists of support rods 7 fixed to the two side walls 3 of the printer, and the pressure rod 2 is a cylindrical straight rod.

[0074] Each support bracket 7 includes a positioning groove 71 that allows the end of the pressure rod 2 to be pressed into it and a positioning block 72 that stabilizes the end of the pressure rod 2 in the positioning groove 71.

[0075] The positioning block 72 has a hollow channel 73 that is perpendicular to the pressure rod 2 and passes through the positioning block 72. The hollow channel 73 is equipped with an end post 74, a compression spring 75 and a ball bearing 76 in sequence from the outside to the inside.

[0076] The ball 76 is placed at the innermost end of the hollow channel 73. The diameter of the inner port of the hollow channel 73 is slightly smaller than the inner diameter of the hollow channel 73. The spherical crown surface of the ball 76, which is smaller than the radius, is exposed and placed in the positioning groove 71. When the end of the pressure rod 2 is placed in the positioning groove 71, the upper half of the pressure rod 2 contacts the exposed spherical crown surface of the ball 76.

[0077] The compression spring 75 applies pressure to the ball 76 in the direction of the positioning groove 71, and the end post 74 is fixed to the outer port of the hollow channel 73 by a screw or other conventional connection method.

[0078] The vertical distance between the positioning groove 71 and the bottom plate of the housing is the same as the vertical distance between the pressure rod 2 and the bottom plate of the housing when the pressure rod 2 is in the normal working position.

[0079] The operating procedure for this embodiment is as follows:

[0080] When the front end of the printing consumable 1 paper needs to be inserted into the printing channel, hold the pressure lever 2 and apply a vertical upward force to easily remove the pressure lever 2. After loading the paper, press both ends of the pressure lever 2 into the positioning groove 71. When pressed in, the ball bearing 76 will retract into the hollow channel 73. After the pressure lever 2 is in place, under the action of the compression spring 75, the exposed part of the ball bearing 76 abuts against the upper half of the pressure lever 2, thereby stabilizing the pressure lever 2 in the normal working position.

Claims

1. A pressing structure for limiting and transmitting printing consumables in a printer, comprising a roll of printing consumables (1) placed in a paper feed channel and a pressure bar (2) pressing the roll of printing consumables (1) down to a plane close to the print head, characterized in that: When the paper tip of the roll printing consumable (1) is inserted into the printing channel, the pressure bar (2) can be opened in the vertical direction through a movable connection structure, which is a lifting structure provided on the left and right side walls (3) of the printer that can lift both ends of the pressure bar (2); The lifting structure consists of inclined slots (4) on the two side walls (3) and an elastic fixing component that can stabilize the pressure rod (2) at the bottom of the inclined slots (4). The top of the inclined slots (4) is a horizontal slot (41) that can support the pressure rod (2). The elastic fixing component is a positioning spring (44), which is disposed on the outer or inner surface of the corresponding side wall (3). Its lower end is fixed to one side of the inclined strip hole (4). The other part of the positioning spring (44) is in an elastic free state. The telescopic section of the positioning spring (44) extends towards the central axis of the inclined strip hole (4). The two ends of the pressure rod (2) can be squeezed up and down through the positioning spring (44) in the inclined strip hole (4) and placed in the bottom end of the inclined strip hole (4) or the horizontal strip hole (41).

2. The pressing structure for limiting and transmitting printing consumables in a printer according to claim 1, characterized in that... The vertical distance between the bottom of the inclined slot (4) and the bottom plate of the housing is the same as the vertical distance between the pressure rod (2) and the bottom plate of the housing when the pressure rod (2) is in the normal working position.

3. The pressing structure for limiting and transmitting printing consumables in a printer according to claim 1 or 2, characterized in that: A plastic tube with a length greater than the width of the roll printing consumable (1) and smooth surfaces inside and out is sleeved on the pressure rod (2). The diameter of the plastic tube is slightly larger than the diameter of the pressure rod (2).

Images