JP2008136899A - Cartridge for discharge gun, and discharging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cartridge for a discharge gun which stops immediately to discharge a fluidity material when a lever of a discharge gun for discharging the fluidity material is returned from a cartridge. <P>SOLUTION: The tube 2 of the cartridge for the discharge gun is composed of a film object. The annular part 5a of a plunger 5 is inserted in the inner surface of the base end part of the tube 2 so that it can be slid. The projection part 5c is formed on the inner surface of the distal end portion of the annular part 5a. The circumferential part of a shielded part 5d comprised of the film object is stuck on the distal end face of the projection part 5c. The more inner side part from the projection part 5c of the shielded part 5d is formed to be a slackened part of a slackened state so that it can be switched from the state evaginated globularly towards the reverse to become a strained state to the state evaginated globularly towards the front. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge gun cartridge used for a discharge gun, and a discharge device including a discharge gun and a discharge gun cartridge.

  In general, as described in Patent Document 1 below, a cartridge for a discharge gun is formed on a cylindrical portion whose both ends are open, a lid portion that closes a distal end opening of the cylindrical portion, and an outer peripheral surface of a proximal end portion of the cylindrical portion. The engaging part provided and the plunger provided in the base end part inner peripheral surface of the cylinder part so that sliding was possible were provided. In the cylinder part between the lid part and the plunger, a fluid substance such as an adhesive or a paint is accommodated.

  The discharge gun for discharging a fluid substance from the cartridge includes a gun body, a guide cylinder, a rod, and a lever respectively provided on the gun body. When the lever is pulled, the rod moves forward. When the piston provided with the tip moves to the tip side in the guide tube and returns the lever, the rod and the piston are returned backward by a predetermined short distance.

  When the fluid substance is discharged from the cartridge using the discharge gun, the cartridge is inserted into the guide tube from the base end opening, and the engaging portion abuts against the base end surface of the guide tube. As a result, the cartridge cannot be moved to the front end side of the guide tube. Thereafter, when the lever is pulled, the piston moves forward and pushes the plunger to move it forward. Then, the fluid substance in the cylinder part is pushed by the plunger and discharged from the discharge port.

JP 2003-40360 A

  The conventional cartridge has a problem in that the flowable substance is poorly cut. That is, after pulling the lever of the discharge gun and returning it to its original position, the piston moves backward by a predetermined distance, so the plunger stops and the discharge of the fluid substance is immediately terminated as soon as the lever is returned. Should do. However, in reality, the fluidity is pressurized by the plunger, and the cylinder part is expanded by the pressure. Therefore, when the plunger is stopped, the expanded cylinder part is reduced and the fluid substance is discharged from the cartridge. Therefore, even if the lever is returned to the original position, the discharge of the fluid substance does not end immediately, and there is a problem that the fluid substance continues to be discharged although it is a small amount. In other words, there was a problem that the flowable substance was poorly cut.

In order to solve the above problems, the first invention includes a cylindrical portion having both ends opened, a lid having a discharge port and closing a distal end opening of the cylindrical portion, and an outer periphery of a proximal end portion of the cylindrical portion A discharge portion that includes an engaging portion provided on a surface and a plunger slidably provided on an inner periphery of the cylindrical portion, and that stores a fluid substance in the cylindrical portion between the lid portion and the plunger. In the gun cartridge, the plunger includes an annular portion having a predetermined strength in which the plunger is slidably fitted to the inner periphery of the cylindrical portion, and a shielding portion for closing the annular portion, and the shielding portion is a film body. And the peripheral part of the shielding part is a fixed part fixed to the annular part, and the part inside the fixed part of the shielding part is loosened so that it can move in the axial direction of the annular part. It is characterized by being a slack portion.
In this case, it is desirable that the fixing portion of the shielding portion is fixed to the tip surface of the annular portion.
In order to solve the above problem, the second invention is such that the gun body is provided with a guide cylinder, a rod, and a lever, and when the lever is pulled, the rod moves forward and its tip portion When the piston provided in is moved from the proximal end side to the distal end side in the guide cylinder and the lever is returned, the rod and the piston are returned by a predetermined distance, and the cylinder part having both ends opened, A lid portion that has a discharge port and closes the distal end opening of the cylindrical portion, an engaging portion provided on the outer peripheral surface of the proximal end portion of the cylindrical portion, and a sliding portion provided on the inner peripheral surface of the cylindrical portion A discharge gun cartridge for containing a flowable substance in the cylinder part between the lid part and the plunger, and the engagement part engages with the base end surface of the guide cylinder. Until the cartridge cannot move forward. The fluidity stored in the cartridge is inserted into the guide cylinder through the proximal end opening, and the plunger is pushed and moved by the piston toward the distal end side of the guide cylinder. In the discharge device for discharging the substance from the discharge port, the plunger has an annular portion having a predetermined strength slidably fitted to the inner periphery of the cylindrical portion, and a shielding portion for closing the annular portion. The shielding part is made of a film body, and the peripheral part of the shielding part is a fixing part fixed to the annular part, and the part inside the fixing part of the shielding part is in the axial direction of the annular part. A slack slack so as to be able to move, the piston is provided on the peripheral edge thereof, and abutment for advancing the planjan by striking the protrusion, and A projecting portion that protrudes forward relative to the abutting portion, and when the piston advances, the slack portion is moved forward by the projecting portion, and the piston At the time of return, the slack portion is moved backward by the pressure in the cartridge.

  When the fluid substance is discharged from the cartridge according to the present invention having the above-described characteristic configuration, the piston is advanced by pulling the lever of the discharge gun, and the plunger is advanced by the piston. Then, the fluid substance in the cartridge is discharged from the discharge port. When the lever is returned to the original position, the piston is returned backward by a predetermined distance automatically or manually by the return mechanism of the discharge gun. Then, the slack portion of the shielding portion made of the film body moves rearward in response to the return movement of the piston, and the internal volume of the cartridge increases accordingly. On the other hand, when the piston returns, the diameter of the cylindrical portion is reduced and the internal volume of the cartridge is reduced. This decrease is offset by the increase due to the movement of the slack portion. Therefore, when the piston is stopped, the discharge of the fluid substance is immediately stopped.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 6 show an embodiment of a discharge gun cartridge according to the present invention. The cartridge 1 includes a cylindrical portion 2, a lid portion 3 provided at the distal end portion of the cylindrical portion 2, an engaging portion 4 provided on the outer peripheral surface of the proximal end portion of the cylindrical portion 2, and an inner periphery of the proximal end portion of the cylindrical portion 2. A plunger 5 is slidably fitted on the surface.

  The cylindrical part 2 is constituted by a film-like body having little flexibility but having flexibility. As the film-like body constituting the cylindrical portion 2, a single layer resin film may be used, but a laminate film, particularly a laminate film of three or more layers in which an aluminum foil is provided between two resin films is used. desirable. The cylindrical portion 2 can be manufactured by various methods. For example, the cylindrical portion 2 can be manufactured by winding a film-like body around a mandrel (not shown) and fixing both end portions thereof. The both ends of the film-like body may be fixed in a so-called envelope tension state in which they are stacked and fixed to each other, or are fixed in a palm tension state in which both ends of the surface constituting the inner peripheral surface of the cylinder portion are fixed facing each other. Also good. When manufacturing the cylinder part 2 by winding a film-like body around a mandrel, a draft angle is required for extracting the cylinder part 2 from the mandrel, so that the cylinder part 2 is moved from one end (hereinafter referred to as the base end) to the other. It is formed in a tapered cylindrical shape so as to have a slightly smaller diameter toward the end (hereinafter referred to as the tip). Of course, when manufacturing by the other method, the cylinder part 2 may be formed as a straight cylinder having a constant inner and outer diameter over the entire length. As shown in FIG. 12, a tapered portion 2a having a smaller diameter toward the front and a straight portion 2b extending forward from the distal end of the tapered portion 2a are forwardly provided at the distal end of the cylindrical portion 2. It is formed sequentially. The straight portion 2b has a constant inner and outer diameter.

  The lid portion 3 is formed by molding a relatively hard resin and has a base portion 3a having a disk shape as shown in FIG. The straight portion 2b of the cylindrical portion 2 is fixed to the outer peripheral surface of the base portion 3a by means such as adhesion or fusion. In this embodiment, the straight portion 2b is fixed to the base portion 3a simultaneously with the formation of the lid portion 3 by the insert molding method. By fixing the distal end portion (straight portion 2b) of the cylindrical portion 2 to the base portion 3a of the lid portion 3, the distal end portion of the cylindrical portion 2 is maintained in a circular cross-sectional state. A short cylindrical portion having the same inner diameter as the outer diameter of the straight portion 2b may be formed on the rear end surface of the base portion 3a, and the straight portion 2b may be fixed to the inner peripheral surface of the cylindrical portion. A circular recess 3b is formed on the rear end surface of the base 3a. The inner peripheral surface of the recess 3b is tapered so as to increase in diameter toward the rear, and the degree of taper and size are set so as to continue without a step from the inner peripheral surface of the tapered portion 2a of the cylindrical portion 2. Has been. At the center of the bottom surface of the recess 3b, a spherical recess 3c made of a part of a spherical surface centered on the axis of the base 3a is formed. A discharge port 3 d is formed at the center of the front surface of the base 3. The rear end portion of the discharge port 3d opens at the center of the spherical recess 3c, and the opening is closed by a sealing material (not shown) made of a resin film or the like. This sealing material is broken when the cartridge 1 is used. When the cartridge 1 is used, a nozzle (not shown) is usually attached to the discharge port 3d.

  The engaging portion 4 is formed by molding a relatively hard resin, and is formed as a straight cylindrical body having a short length. As shown in FIGS. 5 and 6, the engaging portion 4 is fitted to the outer peripheral surface of the base end portion of the cylindrical portion 2 and is fixed by means such as adhesion or fusion. Thereby, the base end portion of the cylindrical portion 2 is maintained in a circular cross-sectional state. The engagement portion 4 can be fixed to the cylinder portion 2 simultaneously with the formation of the engagement portion 4 by, for example, an insert molding method.

  A base end portion (right end portion in FIGS. 5 and 6) 4 a of the engaging portion 4 protrudes rearward in the axial direction from the cylindrical portion 2. A pair of engagement protrusions 4b and 4b and a pair of slits 4c and 4c are formed on the outer peripheral surface of the base end 4a. The pair of engaging protrusions 4 b and 4 b are disposed 180 degrees apart in the circumferential direction of the engaging portion 4. The pair of slits 4 c and 4 c are also arranged 180 degrees apart in the circumferential direction of the engaging portion 4. In addition, each slit 4c is disposed close to the engagement protrusion 4b. The engaging portion 4 has a low breaking strength at the portion where the slit 4c is formed. When the outer peripheral surface of the portion where the slit 4c is formed is pushed inward with a force of a predetermined size or more, the slit 4c is formed. Break from. As a result, the base end portion of the cylindrical portion 2 and the engaging portion 4 can be crushed as shown in FIG. Note that only one engagement protrusion 4c and one slit 4c may be formed, or three or more may be formed. On the inner peripheral surface of the base end portion 4a of the engaging portion 4, a pair of locking projections 4d, 4d having a low height are formed. The pair of locking projections 4d, 4d are arranged 180 degrees apart in the circumferential direction of the engaging portion.

  The plunger 5 has an annular portion 5a having a circular cross section formed by molding a relatively hard resin. The annular portion 5 a has a diameter approximately equal to or slightly larger than the inner diameter of the base end portion of the cylindrical portion 2, and is slidably fitted to the inner peripheral surface of the base end portion of the cylindrical portion 2. The base end surface of the annular portion 5a is in contact with the locking projection 4d. As a result, the annular portion 5a and thus the plunger 5 are prevented from coming out rearward from the proximal end opening of the cylindrical portion 2. The annular portion 5a is inserted into the cylindrical portion 2 from the proximal end opening of the engaging portion 4, and the locking protrusion 4d is elastically expanded while the proximal end portion 4a of the engaging portion 4 is elastically expanded. Get over.

  A tapered portion 5b that decreases in diameter toward the front is formed on the outer peripheral surface of the tip portion of the annular portion 5a. The taper portion 5 b has the same taper degree and almost the same size as the taper portion 2 a formed at the tip of the tube portion 2 and the inner peripheral surface of the recess 3 a of the lid portion 3. A projecting portion 5c is formed on the inner peripheral surface of the tip of the annular portion 5a so as to project inward in the radial direction. The protrusion 5c extends in an annular shape along the annular portion 5a.

  A shielding portion 5d is fixed to the tip surface of the protruding portion 5c. The protruding portion 5c is closed by the shielding portion 5d, and as a result, the tip opening of the annular portion 5a is closed. Therefore, when the plunger 5 is fitted to the proximal end portion of the tubular portion 2, the proximal end portion of the tubular portion 2 is closed by the plunger 5. As a result, both the front and rear end portions of the cylindrical portion 2 are closed by the lid portion 3 and the plunger 5, respectively. And inside the cylinder part 2 located between the plunger 5 and the cover part 3, fluid substances, such as an adhesive agent, a coating material, and a caulking material, are filled.

  The shielding part 5d is formed of a film-like body similar to the film-like body constituting the cylindrical portion 2. The shielding part 5d is configured by a planar ring part (adhering part) 5e formed on the peripheral edge part thereof and a slack part 5f provided integrally on the inner peripheral part of the ring part 5e. The ring 5e is fixed to the tip surface of the protruding portion 5c by adhesion or other means. The slack portion 5f is provided in a slack state. For example, when a positive pressure is applied to the inside of the cylindrical portion 2 between the plunger 5 and the lid portion 3 to thereby stretch the slack portion 5f, FIG. As shown in FIG. 5, the slack portion 5f bulges toward the base end side of the cylindrical portion 2 and becomes spherical. The center of this spherical surface is located on the axis of the annular portion 5a, and the radius of curvature of the spherical surface is set to be substantially the same as the radius of curvature of the spherical surface constituting the spherical recess 3c. Before the cartridge 1 is used, the slack portion 5f is pushed backward by the flowable substance in the cartridge 1, so that the state shown in FIG. When pressure is applied to the outside of the plunger 5, the shielding portion 5 d swells in a spherical shape toward the distal end side of the cylindrical portion 2, as shown in FIGS. Put out. Of course, the radius of curvature of the spherical surface at this time is also the same as the radius of curvature of the spherical surface constituting the spherical recess 3c. When the plunger 5 moves to the foremost state with the slack portion 5f sticking out in a spherical shape toward the distal end side of the cylindrical portion 2, the tapered portion 5b of the plunger 5 becomes the tapered portion 2a of the cylindrical portion 2 and the concave portion of the lid portion 3. The shield 5d contacts the inner peripheral surface of 3b with almost no gap and the bottom of the recess 3b with almost no gap. That is, the front end portion of the plunger 5 contacts the front end portion of the cylinder portion 2 and the rear end portion of the lid portion 3 with almost no gap. Thereby, the fluid substance with which the cylinder part 2 was filled is discharged without waste.

  Next, an example of a discharge gun for discharging a fluid substance from the cartridge 1 having the above configuration will be described. The discharge gun 10 shown in FIGS. 7 and 8 has a gun body 11. A guide cylinder 12 is supported at the tip of the gun body 11 so as to be rotatable between a discharge position shown in FIG. 7 and an insertion / removal position shown in FIG. The guide cylinder 12 is formed of a hard resin. The inner diameter of the guide cylinder 12 is set to be substantially the same as the outer diameter of the engaging portion 4, and the cartridge 1 can be inserted into and removed from the guide cylinder 12. A pair of first recesses 12 a and 12 a and a pair of second recesses 12 b and 12 b are formed at the base end portion of the guide cylinder 12. The first recesses 12a and 12a are disposed 180 degrees apart in the circumferential direction of the guide cylinder 12, and the engaging protrusions 4b and 4b of the engaging portion 4 of the cartridge 1 are formed so as to be fitted thereinto. Then, the engagement protrusion 4b is fitted into the first recess 12a, whereby the circumferential positioning of the cartridge 1 with respect to the guide tube 12 is performed. In addition, the cartridge 1 is locked to the distal end side of the guide tube 12 so that the engagement protrusion 4b abuts against the bottom surface of the first recess 12a. The second recess 12b is arranged so that the slit 4c is positioned at substantially the center of the second recess 12b in the circumferential direction of the guide tube 12 when the engagement protrusion 4b is fitted into the first recess 12a. Therefore, the slit 4c and the outer peripheral surface of the engaging portion 4 adjacent thereto are exposed to the outside through the second recess 12b.

  A rod 13 is provided on the gun body 11 behind the guide tube 12. The rod 13 is disposed so that its axis coincides with the axis of the guide cylinder located at the discharge position, and is movable in the direction of the axis. When the lever 13 provided on the gun body 11 is rotated (pulled) in the direction of the arrow from the initial position shown in FIG. 7, the rod 13 is rotated by a forward mechanism (not shown) provided on the gun body 11. It can be moved forward by a distance corresponding to the amount of movement. On the other hand, the rod 13 is returned by a predetermined return distance by a return mechanism (not shown) provided in the gun body 11 when the lever 14 is returned to the initial position after rotating the lever 14 in the arrow direction. Of course, this return distance is set shorter than the advance distance of the rod 13 as the lever 14 rotates. The advance mechanism and the return mechanism are well-known structures, and the structures themselves are not related to the present invention. Therefore, description of the advance mechanism and the return mechanism is omitted.

  As shown in FIGS. 8 and 12, a piston 15 is provided at the tip of the rod 13. The piston 15 has a disk shape, and is provided such that its axis coincides with the axis of the rod 13. An annular contact portion 15 a that protrudes radially outward is formed on the outer peripheral surface of the base end portion of the piston 15. The outer diameter of the contact portion 15a is set smaller than the inner diameter of the annular portion 5a of the plunger 5 and larger than the inner diameter of the protruding portion 5c. Therefore, when the piston 15 is inserted into the cartridge 1 from the base end opening, the contact portion 15a hits the protruding portion 5c, and the plunger 5 is advanced.

  On the front surface of the piston 15, a protruding portion 15b made of a part of a spherical surface is formed. The spherical surface constituting the protruding portion 15 b has its center located on the axis of the piston 15. The curvature radius of the spherical surface is set to be substantially the same as the curvature radius of the spherical surface constituting the spherical concave portion 3 c of the lid portion 3. Moreover, as shown in FIG. 10, when the abutting portion 15 a hits the protruding portion 15, the tip surface of the protruding portion 15 b is stretched so as to push the shielding portion 5 d of the plunger 5 forward to form a part of a spherical surface. To do.

  When a fluid substance is discharged from the cartridge 1 using the discharge gun 10 having the above configuration, first, as shown in FIG. 8, the guide cylinder 12 of the discharge gun 10 is rotated to the insertion / removal position. Then, the cartridge 1 is inserted into the guide tube 12 from the base end opening. Of course, the cartridge 1 is inserted from the lid portion 3 a and inserted until the engaging protrusion 4 b hits the bottom surface of the first recess 12 a of the guide tube 12. Thereafter, the guide cylinder 12 is rotated to the discharge position.

  Next, the lever 13 is moved forward by repeating the rotation operation (pull operation) and the return operation of the lever 14 in the direction of the arrow in FIG. 8, and the protruding portion 15 b of the piston 15 is abutted against the shielding portion 5 d of the plunger 5. Further, the contact portion 15a is abutted against the protruding portion 5c. As a result, the plunger 5 moves forward together with the piston 15. Therefore, thereafter, an amount of fluid material corresponding to the amount of rotation of the lever 14 is discharged from the discharge port 3d.

  When the lever 14 is rotated and then returned to the original initial position, the piston 15 and the rod 13 are returned backward by a predetermined distance by the return mechanism. Assuming that the piston 15 is stopped at the position shown in FIG. 10 when the lever 14 is returned, the cylindrical portion 2 is reduced in diameter by its own elasticity, so that the fluid substance is continuously discharged. End up. However, when the fluid substance is discharged from the cartridge 1 according to the present invention using the discharge gun 10, when the lever 14 is returned, the piston 15 is returned backward by a predetermined distance as shown in FIG. Then, the slack part 5f of the shielding part 5d follows the piston 15 and moves backward. As a result, the internal volume of the cartridge 1 increases by the amount of backward movement of the slack portion 5f. The increase in the internal volume cancels out the decrease in the internal volume of the cartridge 1 due to the reduced diameter of the cylindrical portion 2. Therefore, when the lever 14 is returned, the discharge of the fluid substance from the discharge port 3d is immediately terminated. That is, the breakage of the fluid substance is improved.

  When the plunger 5 is moved to the forefront, the front end portion of the plunger 5 abuts against the rear end portion of the lid portion 3 and stops, as shown in FIG. At this time, since the shape and size of the front end portion of the plunger 5 are set to be substantially the same as the shape and size of the front end portion of the cylindrical portion 2 and the rear end portion of the lid portion 3, the flow filled in the cylindrical portion 2. The substance can be discharged almost without any excess. Thereby, the discharge of the fluid substance from the cartridge 1 is completed.

  After the discharge is completed, a finger is inserted from the second recess 12b of the guide tube 12 to push the portion where the slit 4c of the engaging portion 4 is formed radially inward, and as shown in FIG. Crush. Then, one engagement protrusion 4b close to the crushed portion is disengaged from the first recess 12a of the guide tube 12. Thereafter, the entire engaging portion 4 is moved in the direction of the arrow in FIG. 13, and the other engaging protrusion 4b is also removed from the first recess 12a. Then, the engaging portion 4 can move forward in the guide cylinder 12, and as a result, the cartridge 1 can move forward in the guide cylinder 12. Therefore, the piston 15 is further advanced by the lever 14, and the lid portion 3, the front end portion of the tube portion 2, and the plunger 5 are extracted forward from the guide tube 12. Thereafter, the entire cartridge 1 is pulled out from the guide tube 12 forward by holding the outer peripheral surface of the lid 3 by hand. Thereafter, the rod 13 is moved rearward until the piston 15 comes out rearward from the guide tube 12 and returns to the original position. As is well known, the rod 13 can be moved backward by releasing the locking state of the rod 13 by the locking mechanism provided in the gun body 11 and then pulling the rod 13 backward by hand. .

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above embodiment, the outer diameter of the slack portion 5f is substantially the same as the inner diameter of the protruding portion 5c, but may be larger than the inner diameter of the protruding portion 5c. In that case, the outer peripheral portion of the slack portion 5f facing the inner peripheral side portion of the end surface of the protruding portion 5c can be contacted and separated in the axial direction of the plunger 5 with respect to the protruding portion 5c.
Further, when the fluid substance is discharged from the cartridge 1, a discharge gun that does not have the rod 13 return mechanism may be used instead of the discharge gun 10. In that case, after the rod 13 and the piston 15 are moved forward to discharge the fluid substance from the cartridge 1, the rod 13 may be manually moved backward by a predetermined distance.

1 is a front view showing an embodiment of a discharge gun cartridge according to the present invention. It is a top view of the embodiment. FIG. 2 is an enlarged view taken along arrow X in FIG. 1. FIG. 2 is a partially omitted enlarged sectional view taken along line YY in FIG. 1. It is an expanded sectional view which follows the XX line of FIG. It is an expanded sectional view which follows the YY line of FIG. It is a perspective view which shows an example of the discharge gun used when discharging a fluid substance from the cartridge which concerns on this invention in the state which located the guide cylinder in the discharge position. It is a perspective view which shows an example of the discharge gun in the state where the guide tube is located at the insertion position. It is sectional drawing which shows the relationship with a guide cylinder, the cartridge inserted in it, and the piston. It is sectional drawing which shows a state when the cartridge is advanced by the piston. It is sectional drawing which shows the state which returned the piston only the predetermined distance. It is sectional drawing which shows the state which moved the cartridge to the front most. FIG. 5 is an enlarged view as viewed in the direction of arrow X in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cartridge 2 Cylinder part 3 Lid part 3d Discharge port 4 Engagement part 5 Plunger 5a Annular part 5d Shielding part 5e Ring part (adhesion part)
5f Slack part 10 Discharge gun 11 Gun body 12 Guide cylinder 13 Rod 14 Lever 15 Guide cylinder

Claims (3)

A cylindrical portion having both ends open, a lid having a discharge port, and closing a distal end opening of the cylindrical portion; an engaging portion provided on an outer peripheral surface of the proximal end portion of the cylindrical portion; In a discharge gun cartridge comprising a plunger provided slidably on the periphery, and containing a flowable substance in the cylinder part between the lid part and the plunger,
The plunger has an annular portion having a predetermined strength that is slidably fitted to the inner periphery of the cylindrical portion, and a shielding portion that closes the annular portion,
The shielding part is made of a film body, and the peripheral part of the shielding part is a fixing part fixed to the annular part, and the part inside the fixing part of the shielding part moves in the axial direction of the annular part. A cartridge for a discharge gun, wherein the cartridge is a slackened slack so that it can be used. The discharge gun cartridge according to claim 1, wherein a fixing portion of the shielding portion is fixed to a front end surface of the annular portion. The gun body is provided with a guide cylinder, a rod, and a lever. When the lever is pulled, the rod moves forward, and the piston provided at the distal end of the gun moves through the guide cylinder from the proximal end side to the distal end. A discharge gun that moves the rod and the piston back by a predetermined distance when the lever is moved back,
A cylindrical portion having both ends open, a lid having a discharge port and closing the distal end opening of the cylindrical portion, an engaging portion provided on an outer peripheral surface of the proximal end portion of the cylindrical portion, and an inner periphery of the cylindrical portion A discharge gun cartridge having a plunger slidably provided on the surface, and containing a flowable substance in the cylindrical portion between the lid portion and the plunger;
The cartridge is inserted into the guide tube from the base end opening until the engaging portion engages with the base end surface of the guide tube and the cartridge cannot move forward, and the plunger is moved by the piston. In the discharge device in which the fluid substance contained in the cartridge is discharged from the discharge port by being pressed and moved toward the distal end side of the guide tube,
The plunger has an annular portion having a predetermined strength that is slidably fitted to the inner periphery of the cylindrical portion, and a shielding portion that closes the annular portion,
The shielding part is made of a film body, and the peripheral part of the shielding part is a fixing part fixed to the annular part, and the part inside the fixing part of the shielding part moves in the axial direction of the annular part. The slack is slack so that you can
The piston is provided at a peripheral portion thereof, and abutment that advances the planjan by abutting against the projection, and a projection that is provided inside the abutment and projects forward with respect to the abutment. And
The discharging device according to claim 1, wherein when the piston moves forward, the slack portion is moved forward by the protruding portion, and when the piston is returned, the slack portion is moved backward by the pressure in the cartridge.

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