Feeder with single and dual drive structure

Abstract

The application discloses a feeding machine with single-double driving structure, which comprises a box body, a lower feeding roller, an upper feeding roller, a main driving mechanism and a transmission shaft group, the transmission shaft group is provided with a transmission shaft, the transmission shaft is rotationally connected to the box body and connected to the lower feeding roller, and the transmission shaft is provided with a transmission hole; the upper feeding roller can move relative to the lower feeding roller to adjust a feeding gap. The transmission shaft group is arranged at one end of the lower feeding roller away from the main driving mechanism, the transmission shaft group is provided with a transmission shaft rotationally connected to the box body, the transmission shaft is connected to the lower feeding roller and provided with a transmission hole, the transmission hole is used for detachably fixedly connected with a secondary driving mechanism, the feeding machine with single-double driving structure can increase the driving mechanism to improve the driving power when the power is insufficient, and the secondary driving mechanism can be detached to reduce the driving power when the power is sufficient, so that the single-double driving of the lower feeding roller is realized, the driving force is strong, and the feeding machine is flexible and changeable in use.

Description

Technical Field

[0001] This invention relates to the field of punch press feeder technology, and more particularly to a feeder with a single or double drive structure. Background Technology

[0002] A punch press feeder is a device installed at the front end (input end) of a punch press for conveying materials (sheet metal). Existing punch press feeders include a housing, a lower feed roller, an upper feed roller, and a drive mechanism. The lower feed roller is driven by the drive mechanism and works in conjunction with the upper feed roller to feed materials. Because the lower feed roller is driven by only one drive mechanism, when the material to be conveyed is heavy or requires rapid conveying, a single drive mechanism cannot meet the power requirements for conveying. Summary of the Invention

[0003] The purpose of this invention is to provide a feeder with a single and dual drive structure to solve the problem that the lower feed roller of the existing punch press feeder is driven by a single drive mechanism, which cannot meet the power demand for conveying.

[0004] This invention is achieved through the following technical solution:

[0005] A feeder with a single / dual drive structure includes a housing. The housing is equipped with a lower feed roller, an upper feed roller, a main drive mechanism, and a transmission shaft assembly. The two axial ends of the lower feed roller are connected to the main drive mechanism and the transmission shaft assembly, respectively. The lower feed roller is driven by the main drive mechanism. The transmission shaft assembly has a transmission shaft rotatably connected to the housing and to the lower feed roller. One end of the transmission shaft facing away from the lower feed roller is exposed outside the housing. A transmission hole is provided at the exposed end of the transmission shaft, extending axially along the lower feed roller. The upper feed roller is located on one side of the lower feed roller and is spaced apart from it to form a feeding gap. The upper feed roller can move relative to the lower feed roller to adjust the feeding gap.

[0006] Furthermore, the housing has an insertion hole through which the lower feed roller passes, the drive shaft assembly has a bearing, the bearing passes through the drive shaft and is fitted into the insertion hole; the axial direction of the drive shaft is defined as the front-to-back direction, the drive shaft assembly has two limiting rings, the two limiting rings pass through the drive shaft and cooperate to restrict the bearing from moving back and forth relative to the drive shaft, and the limiting rings are detachably fixedly connected to the housing.

[0007] Furthermore, of the two limiting rings, one limiting ring is defined as a rear limiting ring and the other limiting ring is defined as a front limiting ring. The rear limiting ring is located rearward and the front limiting ring is located forward. The housing is provided with a front limiting hole for inserting the front limiting ring. The front limiting ring has a front stop portion that extends rearward into the insertion hole and abuts against the bearing. The drive shaft has a rear shoulder, and the rear shoulder cooperates with the front limiting ring to restrict the forward and backward movement of the bearing.

[0008] Furthermore, the front limiting ring and the transmission shaft are spaced apart to form a limiting gap. A retaining ring is inserted into the limiting gap on the transmission shaft. The retaining ring can elastically deform in the radial direction of the transmission shaft. The retaining ring has an outer retaining piece, an inner retaining piece, and a connecting piece. The outer retaining piece and the inner retaining piece are spaced apart in the radial direction of the transmission shaft. The connecting piece connects the outer retaining piece and the inner retaining piece. The outer retaining piece abuts against the front limiting ring, and the inner retaining piece abuts against the transmission shaft and is inclined backward from the outside to the inside.

[0009] Furthermore, the lower feed roller has a secondary mounting hole for the drive shaft to be inserted, the drive shaft and the wall of the secondary mounting hole are spaced apart to form a secondary mounting gap, a secondary abutment is provided on the drive shaft, the secondary abutment has a secondary inner stop ring embedded in the secondary mounting gap and a secondary outer stop ring abutting against the edge of the secondary mounting hole.

[0010] Furthermore, two hydraulic tensioning sleeves are provided on the lower feed roller, and the two hydraulic tensioning sleeves are spaced apart in the axial direction of the lower feed roller.

[0011] Furthermore, the main drive mechanism is mounted on the housing and has a main motor that is connected to the lower feed roller. The output shaft of the main motor is defined as the main output shaft. The lower feed roller has a main mounting hole for the main output shaft to be inserted. The main output shaft and the wall of the main mounting hole are spaced apart to form a main mounting gap. A main abutment is provided on the main output shaft. The main abutment has a main inner stop ring embedded in the main mounting gap and a main outer stop ring abutting against the edge of the main mounting hole.

[0012] Furthermore, the housing is provided with a cover, which is detachably and fixedly connected to the housing to cover one end of the drive shaft exposed in the housing.

[0013] Furthermore, it also includes a secondary drive mechanism, which is detachably and fixedly connected to the transmission shaft assembly via the transmission hole. The lower feed roller is driven by the main drive mechanism and the secondary drive mechanism. The secondary drive mechanism is located on the housing and has a secondary motor that is connected to the transmission shaft. The output shaft of the secondary motor is defined as the secondary output shaft, which is inserted into the transmission hole.

[0014] Furthermore, it also includes an upper transmission component and an adjusting seat. The transmission shaft has a lower transmission part. The upper transmission component is rotatably connected to the housing and meshes with the lower transmission part. The upper feed roller is rotatably connected to the adjusting seat and one end is slidably connected to the upper transmission component. The adjusting seat can move along the housing, causing the upper feed roller to move along the upper transmission component closer to or away from the lower feed roller.

[0015] The advantage of this technical solution is that by configuring a transmission shaft assembly at the end of the lower feed roller away from the main drive mechanism, the transmission shaft assembly has a transmission shaft that is rotatably connected to the housing, the transmission shaft is connected to the lower feed roller and has a transmission hole, and the transmission hole is used for detachable fixed connection with the auxiliary drive mechanism. This allows the feeder with single and dual drive structure to increase the driving power by adding a drive mechanism when the power is insufficient, and to remove the auxiliary drive mechanism when the power is sufficient to reduce the driving power. This realizes single drive (driven only by the main drive mechanism) and dual drive (driven by the main drive mechanism and the auxiliary drive mechanism) of the lower feed roller, which has strong driving force and is flexible and versatile in use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a three-dimensional feeder with a single / dual drive structure disclosed in the embodiments. Figure 1 (Single drive);

[0019] Figure 2 This is a cross-sectional view (single drive) of a feeder with a single and dual drive structure disclosed in the embodiment;

[0020] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0021] Figure 4 yes Figure 2 A magnified view of a section at point B in the middle;

[0022] Figure 5 yes Figure 3 A magnified view of a section at point C;

[0023] Figure 6 This is a three-dimensional feeder with a single / dual drive structure disclosed in the embodiments. Figure 2 (Hidden box);

[0024] Figure 7 yes Figure 6 A magnified view of a section at point D;

[0025] Figure 8 This is a three-dimensional feeder with a single / dual drive structure disclosed in the embodiments. Figure 3 (Dual drive);

[0026] Figure 9 This is a cross-sectional view (dual drive) of a feeder with a single and dual drive structure disclosed in the embodiment;

[0027] Figure 10 yes Figure 9 A magnified view of a section at point F in the middle;

[0028] Figure 11 This is a perspective view of the drive shaft in the embodiment. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example: Figure 1-11 As shown, the feeder with a single and double drive structure includes a housing 1 and a lower feed roller 2, an upper feed roller 3, a main drive mechanism 4, a secondary drive mechanism 5, and a transmission shaft assembly 6 mounted on the housing 1. The axial ends of the lower feed roller 2 are connected to the main drive mechanism 4 and the transmission shaft assembly 6, respectively. The lower feed roller 2 is driven by the main drive mechanism 4, or by the main drive mechanism 4 and the secondary drive mechanism 5. The transmission shaft assembly 6 has a transmission shaft 601, which is rotatably connected to the housing 1 and connected to the lower feed roller 2. The transmission shaft 601 rotates synchronously with the lower feed roller 2. One end of the transmission shaft 601, which is away from the lower feed roller 2, is exposed outside the housing 1. The end of the transmission shaft 601 exposed outside the housing 1 is provided with a transmission hole 602. The transmission hole 602 extends axially along the lower feed roller 2. The auxiliary drive mechanism 5 is detachably fixedly connected to the transmission shaft 601 through the transmission hole 602. The upper feed roller 3 is located on one side of the lower feed roller 2 and is spaced apart from the lower feed roller 2 to form a feeding gap (not shown in the figure). The upper feed roller 3 can move relative to the lower feed roller 2 to adjust the feeding gap.

[0031] When the material to be conveyed is heavy or requires rapid conveying, the auxiliary drive mechanism 5 is mounted on the drive shaft 601. At this time, the lower feed roller 2 is driven by both the main drive mechanism 4 and the auxiliary drive mechanism 5. The lower feed roller 2 has a strong conveying capacity, enabling the feeder with single and double drive structure to convey heavier or faster materials. When the material to be conveyed is light or requires slow conveying, the auxiliary drive mechanism 5 is removed from the drive shaft 601. At this time, the lower feed roller 2 is driven by the main drive mechanism 4, and the conveying capacity of the lower feed roller 2 is reduced. This allows the feeder with single and double drive structure to convey lighter or slower materials, making it flexible and versatile in use.

[0032] In summary, this embodiment provides a feeder with a single and dual drive structure to solve the problem that the lower feed roller of the existing punch press feeder is driven by a single drive mechanism and cannot meet the power demand for conveying. The main solution is to configure a transmission shaft assembly 6 at the end of the lower feed roller 2 away from the main drive mechanism 4. The transmission shaft assembly 6 has a transmission shaft 601 that is rotatably connected to the housing 1. The transmission shaft 601 is connected to the lower feed roller 2 and has a transmission hole 602. The transmission hole 602 is used for detachable fixed connection with the auxiliary drive mechanism 5. This allows the feeder with a single and dual drive structure to increase the driving power by adding a drive mechanism when the power is insufficient, and to detach the auxiliary drive mechanism 5 when the power is sufficient to reduce the driving power. This achieves single drive (driven only by the main drive mechanism 4) and dual drive (driven by the main drive mechanism 4 and the auxiliary drive mechanism 5) of the lower feed roller 2, which has strong driving force and is flexible and versatile in use.

[0033] In this embodiment of the invention, the housing 1 has an insertion hole (not shown in the figure) through which the lower feed roller 2 passes, and the drive shaft assembly 6 has a bearing 603, which passes through the drive shaft 601 and is fitted into the insertion hole. This arrangement, by configuring the insertion hole on the housing 1 and the bearing 603 fitted into the insertion hole on the drive shaft 601, ensures stable and smooth rotation of the drive shaft 601.

[0034] In this embodiment of the invention, the axial direction of the drive shaft 601 is defined as the front-to-back direction. The drive shaft assembly 6 has two limiting rings 604, which are inserted through the drive shaft 601 to restrict the front-to-back movement of the bearing 603 relative to the drive shaft 601. The limiting rings 604 are detachably fixedly connected to the housing 1. The above arrangement, by configuring two limiting rings 604 on the drive shaft 601 to restrict the front-to-back movement of the bearing 603, ensures the stable assembly of the bearing 603.

[0035] In this embodiment of the invention, one of the two limiting rings 604 is defined as a rear limiting ring 605, and the other limiting ring 604 is defined as a front limiting ring 606. The rear limiting ring 605 is located rearward, and the front limiting ring 606 is located forward. The housing 1 is provided with a front limiting hole (not shown in the figure) for inserting the front limiting ring 606. The front limiting ring 606 has a front stop portion 607 that extends rearward into the insertion hole and abuts against the bearing 603. The above arrangement ensures stable assembly of the front limiting ring 606 and the housing 1 by providing a front limiting hole for inserting the front limiting ring 606, and ensures stable assembly of the bearing 603 by providing a front stop portion 607 that extends into the insertion hole and abuts against the bearing 603.

[0036] In this embodiment of the invention, the drive shaft 601 has a rear shoulder 608, which cooperates with the front limiting ring 606 to restrict the forward and backward movement of the bearing 603. This arrangement, by configuring the rear shoulder 608 on the drive shaft 601 to cooperate with the front limiting ring 606 to restrict the forward and backward movement of the bearing 603, ensures stable assembly of the bearing 603.

[0037] In this embodiment of the invention, a limiting ring 606 and a drive shaft 601 are radially spaced to form a limiting gap (not shown in the figure). A retaining ring 609 is inserted through the drive shaft 601 and fitted into the limiting gap. The retaining ring 609 can elastically deform in the radial direction of the drive shaft 601. The retaining ring 609 has an outer retaining piece 610, an inner retaining piece 611, and a connecting piece 612. The outer retaining piece 610 and the inner retaining piece 611 are radially spaced. The connecting piece 612 connects the outer retaining piece 610 and the inner retaining piece 611. The outer retaining piece 610 abuts against the front limiting ring 606, and the inner retaining piece 611 abuts against the drive shaft 601 and is inclined backward from the outside to the inside. The above arrangement, by placing the retaining ring 609 between the drive shaft 601 and the front limiting ring 606, makes the assembly of the drive shaft 601 stable.

[0038] In this embodiment of the invention, the lower feed roller 2 has a secondary mounting hole 201 for inserting a drive shaft 601. A secondary mounting gap (not shown in the figure) is formed between the drive shaft 601 and the wall of the secondary mounting hole 201. A secondary abutment 614 passes through the drive shaft 601. The secondary abutment 614 has an inner secondary stop ring 615 embedded in the secondary mounting gap and an outer secondary stop ring 616 abutting against the edge of the secondary mounting hole 201. This arrangement, by providing a secondary mounting hole 201 for inserting the drive shaft 601 on the lower feed roller 2 and a secondary abutment 614 at least partially embedded in the secondary mounting gap on the drive shaft 601, ensures stable assembly between the drive shaft 601 and the lower feed roller 2.

[0039] In this embodiment of the invention, two hydraulic tensioning sleeves 8 are mounted on the lower feed roller 2, and the two hydraulic tensioning sleeves 8 are spaced apart in the axial direction of the lower feed roller 2. This arrangement, by configuring two hydraulic tensioning sleeves 8 on the lower feed roller 2 and spaced apart in the axial direction of the lower feed roller 2, gives the lower feed roller 2 good load-bearing capacity and excellent material conveying effect.

[0040] In this embodiment of the invention, the main drive mechanism 4 is mounted on the housing 1 and has a main motor 401 that is connected to the lower feed roller 2 for transmission. The output shaft of the main motor 401 is defined as the main output shaft 402. The lower feed roller 2 has a main mounting hole 202 for the main output shaft 402 to be inserted. The main output shaft 402 and the wall of the main mounting hole 202 are spaced apart to form a main mounting gap (not shown in the figure). A main abutment 403 is provided on the main output shaft 402. The main abutment 403 has a main inner stop ring 404 embedded in the main mounting gap and a main outer stop ring 405 abutting against the edge of the main mounting hole 202. The above arrangement makes the assembly of the lower feed roller 2 and the main output shaft 402 stable.

[0041] In this embodiment of the invention, a cover 9 is provided on the housing 1. The cover 9 is detachably and fixedly connected to the housing 1 to cover one end of the drive shaft 601 exposed in the housing 1. The above arrangement, by configuring the cover 9 on the housing 1 to cover one end of the drive shaft 601 exposed in the housing 1, avoids the transmission hole 602 being exposed when the feeder with single or dual drive structure is driven in single drive mode.

[0042] In this embodiment of the invention, the auxiliary drive mechanism 5 is provided on the housing 1 and has an auxiliary motor 501 that is connected to the drive shaft 601. The output shaft of the auxiliary motor 501 is defined as the auxiliary output shaft 502, and the auxiliary output shaft 502 is inserted into the drive hole 602.

[0043] In this embodiment of the invention, an upper transmission member 10 and an adjusting seat 11 are also included. The transmission shaft 601 has a lower transmission part 615. The upper transmission member 10 is rotatably connected to the housing 1 and meshes with the lower transmission part 615. The upper feeding roller 3 is rotatably connected to the adjusting seat 11 and one end is slidably connected to the upper transmission member 10. The adjusting seat 11 can move along the housing 1, causing the upper feeding roller 3 to move along the upper transmission member 10 closer to or further away from the lower feeding roller 2. When the upper feeding roller 3 moves along the upper transmission member 10 closer to or further away from the lower feeding roller 2, the feeding distance between the upper feeding roller 2 and the lower feeding roller 3 is adjusted, allowing the feeder with a single and double drive structure to switch between a feeding state and a releasing state. The above configuration, by arranging a lower transmission part 615 on the transmission shaft 601, arranging an upper transmission member 10 on the housing 1 that meshes with the lower transmission part 615, and arranging an upper feeding roller 3 that slides with the lower transmission part 615 on the adjusting seat 11, achieves the adjustment of the feeding gap while avoiding the separation collision between the lower transmission part 615 and the upper transmission member 10 when adjusting the gap.

[0044] It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0045] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered as protected by the present invention.

Claims

1. Feeder with single-double drive structure, comprising a box (1), characterized in that, The box (1) is provided with a lower feeding roller (2), an upper feeding roller (3), a main driving mechanism (4), a secondary driving mechanism (5) and a transmission shaft group (6), the axial ends of the lower feeding roller (2) are connected with the main driving mechanism (4) and the transmission shaft group (6) respectively, the lower feeding roller (2) is driven by the main driving mechanism (4), the transmission shaft group (6) has a transmission shaft (601) rotatably connected to the box (1), one end of the transmission shaft (601) is connected with the lower feeding roller (2), and the other end of the transmission shaft (601) is exposed to the box (1), the transmission shaft (601) is provided with a transmission hole (602) at the end exposed to the box (1), and the transmission hole (602) extends along the axial direction of the lower feeding roller (2); the upper feeding roller (3) is arranged on one side of the lower feeding roller (2) and is spaced from the lower feeding roller (2) to form a feeding gap, and the upper feeding roller (3) can move relative to the lower feeding roller (2) to adjust the feeding gap; the box (1) has an insertion hole through which the lower feeding roller (2) passes, and the transmission shaft group (6) has a bearing (603) which is arranged on the transmission shaft (601) and embedded in the insertion hole; The secondary driving mechanism (5) is detachably fixedly connected with the transmission hole (602) and the transmission shaft group (6), and the lower feeding roller (2) is driven by the main driving mechanism (4) and the secondary driving mechanism (5); the secondary driving mechanism (5) is arranged on the box (1) and has a secondary motor (501) which is in transmission connection with the transmission shaft (601), the output shaft of the secondary motor (501) is defined as a secondary output shaft (502), and the secondary output shaft (502) is insertedly matched with the transmission hole (602); The axial direction of the transmission shaft (601) is defined as the front-rear direction, the transmission shaft group (6) has two limiting rings (604), the two limiting rings (604) are arranged on the transmission shaft (601) to limit the front-rear movement of the bearing (603) relative to the transmission shaft (601), and the limiting rings (604) are detachably fixedly connected with the box (1); of the two limiting rings (604), one limiting ring (604) is defined as a rear limiting ring (605), and the other limiting ring (604) is defined as a front limiting ring (606), the rear limiting ring (605) is located at the rear, and the front limiting ring (606) is located at the front, the box (1) is provided with a front limiting hole into which the front limiting ring (606) is arranged, and the front limiting ring (606) has a front stop portion (607) which extends rearward into the insertion hole and abuts against the bearing (603); the transmission shaft (601) has a rear abutting shoulder (608), and the rear abutting shoulder (608) cooperates with the front limiting ring (606) to limit the front-rear movement of the bearing (603). The front limiting ring (606) is spaced apart from the transmission shaft (601) to form a limiting gap, and the transmission shaft (601) is provided with a limiting ring (609) embedded in the limiting gap, and the limiting ring (609) can be elastically deformed in the radial direction of the transmission shaft (601); the limiting ring (609) has an outer limiting piece (610), an inner limiting piece (611) and a connecting piece (612), the outer limiting piece (610) and the inner limiting piece (611) are spaced apart in the radial direction of the transmission shaft (601), the connecting piece (612) connects the outer limiting piece (610) and the inner limiting piece (611), the outer limiting piece (610) abuts on the front limiting ring (606), and the inner limiting piece (611) abuts on the transmission shaft (601) and is inclined rearward from outside to inside.

2. The feeder with single-double drive structure according to claim 1, characterized in that, The lower feeding roller (2) has a secondary mounting hole (201) for inserting the transmission shaft (601), the transmission shaft (601) is spaced apart from the hole wall of the secondary mounting hole (201) to form a secondary mounting gap, and the transmission shaft (601) is provided with a secondary limiting piece (614), the secondary limiting piece (614) has a secondary inner limiting ring (615) embedded in the secondary mounting gap and a secondary outer limiting ring (616) abutting on the hole edge of the secondary mounting hole (201).

3. The feeder with single-double drive structure according to claim 1, characterized in that, The lower feeding roller (2) is provided with two oil pressure expansion sleeves (8), and the two oil pressure expansion sleeves (8) are spaced apart in the axial direction of the lower feeding roller (2).

4. The feeder having a single-double drive structure according to claim 1, wherein The main drive mechanism (4) is arranged on the box body (1) and has a main motor (401) in transmission connection with the lower feeding roller (2), and the output shaft of the main motor (401) is defined as a main output shaft (402); The lower feeding roller (2) has a main mounting hole (202) for inserting the main output shaft (402); The main output shaft (402) is spaced apart from the hole wall of the main mounting hole (202) to form a main mounting gap, and the main output shaft (402) is provided with a main limiting piece (403), the main limiting piece (403) has a main inner limiting ring (404) embedded in the main mounting gap and a main outer limiting ring (405) abutting on the hole edge of the main mounting hole (202).

5. The feeder having a single-double drive structure according to claim 1, wherein The box body (1) is provided with a shielding cover (9) which is detachably fixedly connected to the box body (1) and used for shielding one end of the transmission shaft (601) exposed outside the box body (1).

6. The feeder having a single-double drive structure according to claim 1, wherein Further comprising an upper transmission member (10) and an adjusting seat (11), the transmission shaft (601) has a lower transmission part, the upper transmission member (10) is rotationally connected to the box body (1) and engaged with the lower transmission part, the upper feeding roller (3) is rotationally connected to the adjusting seat (11) and one end thereof is slidingly connected to the upper transmission member (10), and the adjusting seat (11) can move along the box body (1) to move the upper feeding roller (3) along the upper transmission member (10) to approach or move away from the lower feeding roller (2).

Images